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Sample records for palma coroba attalea

  1. Phylogenetic analysis of Attalea (Arecaceae): insights on the historical biogeography of a recently diversified Neotropical plant group

    Technology Transfer Automated Retrieval System (TEKTRAN)

    Technical Abstract Here we present a dated phylogenetic tree of the neotropical palm genus Attalea (Arecaceae). We used six orthologs from the nuclear WRKY gene family across 98 accessions to address relationships among species and biogeographic hypotheses. Here we found that the formerly recognized...

  2. Fruit production of Attalea colenda (Arecaceae) in coastal Ecuador - an alternative oil resource?

    SciTech Connect

    Feil, J.P.

    1996-07-01

    Attalea colenda is a monoecious palm found in pastures in coastal Ecuador. In dry regions, it is a valuable source of oil in self-sufficiency farming or in combination with cattle in pastures. The palm was studied over a gradient of dry to humid environments during two fruiting seasons. Palm growth, production of leaves, inflorescences, and infructescences, number of fruits per infructescence, and seed weight of five populations were evaluated. The individual of average size is 15 m tall, which corresponds to approximately 30-40 years of age. No difference in fruit production was recorded between wet and dry regions of coastal Ecuador. The average production of one hectare of pasture, with 50 palms, was 0.9 t of oil per year. One population that was part of an agroforestry system produced 50% more fruits than the average of all populations in pasture. 18 refs., 1 fig., 6 tabs.

  3. Population genetic structure of Attalea vitrivir Zona (Arecaceae) in fragmented areas of southeast Brazil.

    PubMed

    Santos, R R M; Cavallari, M M; Pimenta, M A S; Abreu, A G; Costa, M R; Guedes, M L

    2015-06-11

    Attalea vitrivir Zona (synonym Orbignya oleifera) is one of the six species of Arecaceae known as "babassu". This species is used to make cosmetics, food, and detergents due to the high concentration of oil in the seeds. It is found only in fragmented areas of southern Bahia State and northern Minas Gerais State, southeast Brazil, and this fragmentation has affected both its ecological and genetic characteristics. We evaluated the genetic diversity and population genetic structure of A. vitrivir in six areas of two different regions at the extremes of its geographical range, in order to gain a better understanding of the factors that affect the distribution and partitioning of its diversity. Nine inter simple sequence repeat (ISSR) markers amplified 74 polymorphic bands, resulting in large diversity values (Shannon diversity index, 0.37-0.47; intrapopulation genetic diversity, 0.25-0.34). Analysis of molecular variance (AMOVA) revealed considerable differentiation between sampling sites (30.03%) and regions (12.08%), although most of the diversity was observed within sampling sites (69%). Further differentiation between sampling sites was noted more in the northern region than in the southern region, highlighting the genetic connectivity between the sampling sites within Rio Pandeiros Environmental Protection Area (southern region). The identification of two distinct genetic clusters (K = 2) corresponded to the northern and southern regions, and corroborated the AMOVA results. We suggest that the northern area, outside Rio Pandeiros Environmental Protection Area, must be included in future management plans for this species.

  4. Human perceptions of landscape change: The case of a monodominant forest of Attalea speciosa Mart ex. Spreng (Northeast Brazil).

    PubMed

    de Almeida, Gabriela M A; Ramos, Marcelo A; Araújo, Elcida L; Baldauf, Cristina; Albuquerque, Ulysses Paulino

    2016-05-01

    From the perception of human populations, we can assess the changes occurring in certain landscapes and the factors that cause those changes. Such studies have proven helpful in increasing the knowledge of the history of a landscape, recognizing past formations and projecting its future. Our research objective was to determine how a landscape dominated by the palm tree Attalea speciosa, a species of ecological, economic, and cultural importance, has been changing over time by synthesizing and comparing historical documents and local perceptions. This study was conducted in Araripe Environmental Protection Area, Northeast Region, Brazil. To understand local landscape change, we interviewed active harvesters in four communities in which A. speciosa use has been documented. Historical documents were evaluated as a complement to the interview data. According to local informants, areas previously used for cultivation and animal husbandry that were abandoned or decimated by droughts in the region may have fostered the expansion of a monodominant A. speciosa forest. Furthermore, other forms of landscape management resulting from human population growth may also have affected the current and past distribution of this forest.

  5. The maternal aborigine colonization of La Palma (Canary Islands)

    PubMed Central

    Fregel, Rosa; Pestano, Jose; Arnay, Matilde; Cabrera, Vicente M; Larruga, Jose M; González, Ana M

    2009-01-01

    Teeth from 38 aboriginal remains of La Palma (Canary Islands) were analyzed for external and endogenous mitochondrial DNA control region sequences and for diagnostic coding positions. Informative sequences were obtained from 30 individuals (78.9%). The majority of lineages (93%) were from West Eurasian origin, being the rest (7%) from sub-Saharan African ascription. The bulk of the aboriginal haplotypes had exact matches in North Africa (70%). However, the indigenous Canarian sub-type U6b1, also detected in La Palma, has not yet been found in North Africa, the cradle of the U6 expansion. The most abundant H1 clade in La Palma, defined by transition 16260, is also very rare in North Africa. This means that the exact region from which the ancestors of the Canarian aborigines came has not yet been sampled or that they have been replaced by later human migrations. The high gene diversity found in La Palma (95.2±2.3), which is one of the farthest islands from the African continent, is of the same level than the previously found in the central island of Tenerife (92.4±2.8). This is against the supposition that the islands were colonized from the continent by island hopping and posterior isolation. On the other hand, the great similarity found between the aboriginal populations of La Palma and Tenerife is against the idea of an island-by-island independent maritime colonization without secondary contacts. Our data better fit to an island model with frequent migrations between islands. PMID:19337312

  6. Study on the Cytotoxic, Genotoxic and Clastogenic Potential of Attalea phalerata Mart. ex Spreng. Oil Pulp In Vitro and In Vivo Experimental Models

    PubMed Central

    Lima Tolouei Menegati, Sara Emilia; Karenina Traesel, Giseli; Souza de Araújo, Flávio Henrique; Honaiser Lescano, Caroline; Moraes Peixoto, Sara; Mao Silva, Felipe Ariel; Heredia Vieira, Silvia Cristina; do Carmo Vieira, Maria; Oesterreich, Silvia Aparecida

    2016-01-01

    Attalea phalerata Mart. ex Spreng. (Arecaceae), popularly known as “bacuri”, is used in Brazilian folk medicine. Its oil is used orally to relieve pulmonary congestion and joint pain. In topical applications, it is applied as an effective hair tonic and anti-dandruff. The in natura pulp and its nuts are used as food because of its nutritional value. Despite its use in folk medicine, there is a lack of data regarding its in vivo/in vitro cytotoxic/genotoxic and clastogenic effects. Therefore, in this study, we evaluated the cytotoxic, genotoxic and clastogenic effects of Attalea phalerata Mart. ex Spreng. oil (APMO) in vitro and in vivo. For the analysis of cytotoxic potential, the Artemia salina and MTT (3-(4,5-dimethizzol-zyl)-2,5-diphenyltetrazolium bromide) assays were performed. Possible cytotoxic, genotoxic and clastogenic effects of APMO intake were determined by performing the comet and micronucleus assays. Male and female Wistar rats were orally treated with doses of 125, 250, 500 or 1000 mg.kg-1 of the APMO daily for 28 consecutive days (four weeks). The results showed that the APMO did not induce cell death in the experiments of Artemia salina and MTT, indicating that it has no cytotoxicity. The APMO did not cause significant damage to the DNA of the rats in the four doses used when compared to the negative control group (saline + Tween® 80). The APMO did not present any significant increase in micronucleated polychromatic erythrocytes (MNPCEs) for the four tested doses. When compared to the positive control group, all groups (comet and micronucleus tests) were statistically different. These data suggest that the administration of Attalea phalerata Mart oil. ex Spreng does not cause cytotoxicity, genotoxicity and clastogenicity in experimental models in vitro and in vivo following oral administration in this study. PMID:27764219

  7. Family structure and dynamics in DePalma's horror films.

    PubMed

    Gordon, N G

    1983-01-01

    An analysis of the familial relationships in Brian DePalma's five major horror films reveals a persistent unconscious fantasy formation involving the nuclear family. These single-parent, only-child families are all tragically destroyed because of an inability to adequately mourn the absent parent. Although the asexual young adults in the films are spared the completely disastrous effects of madness and violence, they are still psychologically traumatized. This hidden subtextual theme involving the family parallels DePalma's bleak view of authority figures outside the home, as well as American society in general. Adequate identity formation requires that people both inside and outside the family accept the adolescent as a separate person. The grim psychological truth threading its way throughout DePalma's horror films is that these young adults are psychically devastated by the effects of a primitive, fused symbiotic relationship in interaction with a society that does not provide an adequate role for the developing person. Consequently, their attempt to psychologically move outside the family, which includes the maturation of their sexuality, results in the destruction of the family itself.

  8. The Isaac Newton Group of Telescopes on La Palma

    NASA Astrophysics Data System (ADS)

    Benn, Chris R.

    2014-08-01

    The ING runs the highly-productive 4.2-mWilliam Herschel Telescope (WHT) and 2.5-m Isaac Newton Telescope (INT) on La Palma in the Canary Islands. I give an overview of the current operational model, commenting on how the model has evolved since the mid-1980s, and on the experience gained with e.g. instrument development; adaptive-optics/LGS deployment; hosting visiting instruments; scheduling; fault handling; student vs staff support of observers; and performance monitoring.

  9. A comparison of the physicochemical properties and fatty acid composition of indaiá (Attalea dubia) and Babassu (Orbignya phalerata) oils.

    PubMed

    Ferreira, Bianca Silva; Faza, Lara Pereira; Le Hyaric, Mireille

    2012-01-01

    The physicochemical properties and fatty acid composition of Attalea dubia (Mart.) Burret (indaiá) seed oil were investigated. The oil was extracted in a soxhlet apparatus using petroleum ether and evaluated for iodine, acid, peroxide, ester, and saponification values. The oil was also analyzed using infrared and nuclear magnetic resonance spectroscopy. The fatty acid profile of the oil was determined by GC-MS. For each analysis indaiá oil was compared to Orbignya phalerata (babassu) oil. The two oils appeared to be very similar in their fatty acid composition, in which lauric acid (the most abundant), myristic acid, caprylic acid, and capric acid were the four main fatty acids detected. The unsaturated fatty acids content was lower for indaiá oil (5.8%) than for babassu oil (9.4%). The results suggest that indaiá palm tree could be cultivated as a new source of vegetable oil with potential for food and cosmetic industries.

  10. A comparison of the physicochemical properties and fatty acid composition of indaiá (Attalea dubia) and Babassu (Orbignya phalerata) oils.

    PubMed

    Ferreira, Bianca Silva; Faza, Lara Pereira; Le Hyaric, Mireille

    2012-01-01

    The physicochemical properties and fatty acid composition of Attalea dubia (Mart.) Burret (indaiá) seed oil were investigated. The oil was extracted in a soxhlet apparatus using petroleum ether and evaluated for iodine, acid, peroxide, ester, and saponification values. The oil was also analyzed using infrared and nuclear magnetic resonance spectroscopy. The fatty acid profile of the oil was determined by GC-MS. For each analysis indaiá oil was compared to Orbignya phalerata (babassu) oil. The two oils appeared to be very similar in their fatty acid composition, in which lauric acid (the most abundant), myristic acid, caprylic acid, and capric acid were the four main fatty acids detected. The unsaturated fatty acids content was lower for indaiá oil (5.8%) than for babassu oil (9.4%). The results suggest that indaiá palm tree could be cultivated as a new source of vegetable oil with potential for food and cosmetic industries. PMID:22593692

  11. Expression and surface display of Cellulomonas endoglucanase in the ethanologenic bacterium Zymobacter palmae.

    PubMed

    Kojima, Motoki; Akahoshi, Tomohiro; Okamoto, Kenji; Yanase, Hideshi

    2012-11-01

    In order to reduce the cost of bioethanol production from lignocellulosic biomass, we developed a tool for cell surface display of cellulolytic enzymes on the ethanologenic bacterium Zymobacter palmae. Z. palmae is a novel ethanol-fermenting bacterium capable of utilizing a broad range of sugar substrates, but not cellulose. Therefore, to express and display heterologous cellulolytic enzymes on the Z. palmae cell surface, we utilized the cell-surface display motif of the Pseudomonas ice nucleation protein Ina. The gene encoding Ina from Pseudomonas syringae IFO3310 was cloned, and its product was comprised of three functional domains: an N-terminal domain, a central domain with repeated amino acid residues, and a C-terminal domain. The N-terminal domain of Ina was shown to function as the anchoring motif for a green fluorescence protein fusion protein in Escherichia coli. To express a heterologous cellulolytic enzyme extracellularly in Z. palmae, we fused the N-terminal coding sequence of Ina to the coding sequence of an N-terminal-truncated Cellulomonas endoglucanase. Z. palmae cells carrying the fusion endoglucanase gene were shown to degrade carboxymethyl cellulose. Although a portion of the expressed fusion endoglucanase was released from Z. palmae cells into the culture broth, we confirmed the display of the protein on the cell surface by immunofluorescence microscopy. The results indicate that the N-terminal anchoring motif of Ina from P. syringae enabled the translocation and display of the heterologous cellulase on the cell surface of Z. palmae.

  12. First EURONEAR NEA discoveries from La Palma using the INT

    NASA Astrophysics Data System (ADS)

    Vaduvescu, O.; Hudin, L.; Tudor, V.; Char, F.; Mocnik, T.; Kwiatkowski, T.; de Leon, J.; Cabrera-Lavers, A.; Alvarez, C.; Popescu, M.; Cornea, R.; Díaz Alfaro, M.; Ordonez-Etxeberria, I.; Kamiński, K.; Stecklum, B.; Verdes-Montenegro, L.; Sota, A.; Casanova, V.; Martin Ruiz, S.; Duffard, R.; Zamora, O.; Gomez-Jimenez, M.; Micheli, M.; Koschny, D.; Busch, M.; Knofel, A.; Schwab, E.; Negueruela, I.; Dhillon, V.; Sahman, D.; Marchant, J.; Génova-Santos, R.; Rubiño-Martín, J. A.; Riddick, F. C.; Mendez, J.; Lopez-Martinez, F.; Gänsicke, B. T.; Hollands, M.; Kong, A. K. H.; Jin, R.; Hidalgo, S.; Murabito, S.; Font, J.; Bereciartua, A.; Abe, L.; Bendjoya, P.; Rivet, J. P.; Vernet, D.; Mihalea, S.; Inceu, V.; Gajdos, S.; Veres, P.; Serra-Ricart, M.; Abreu Rodriguez, D.

    2015-05-01

    Since 2006, the European Near Earth Asteroids Research (EURONEAR) project has been contributing to the research of near-Earth asteroids (NEAs) within a European network. One of the main aims is the amelioration of the orbits of NEAs, and starting in 2014 February we focus on the recovery of one-opposition NEAs using the Isaac Newton Telescope (INT) in La Palma in override mode. Part of this NEA recovery project, since 2014 June EURONEAR serendipitously started to discover and secure the first NEAs from La Palma and using the INT, thanks to the teamwork including amateurs and students who promptly reduce the data, report discoveries and secure new objects recovered with the INT and few other telescopes from the EURONEAR network. Five NEAs were discovered with the INT, including 2014 LU14, 2014 NL52 (one very fast rotator), 2014 OL339 (the fourth known Earth quasi-satellite), 2014 SG143 (a quite large NEA), and 2014 VP. Another very fast moving NEA was discovered but was unfortunately lost due to lack of follow-up time. Additionally, another 14 NEA candidates were identified based on two models, all being rapidly followed-up using the INT and another 11 telescopes within the EURONEAR network. They include one object discovered by Pan-STARRS, two Mars crossers, two Hungarias, one Jupiter trojan, and other few inner main belt asteroids (MBAs). Using the INT and Sierra Nevada 1.5 m for photometry, then the Gran Telescopio de Canarias for spectroscopy, we derived the very rapid rotation of 2014 NL52, then its albedo, magnitude, size, and its spectral class. Based on the total sky coverage in dark conditions, we evaluate the actual survey discovery rate using 2-m class telescopes. One NEA is possible to be discovered randomly within minimum 2.8 deg2 and maximum 5.5 deg2. These findings update our past statistics, being based on double sky coverage and taking into account the recent increase in discovery.

  13. Crystal structure of pyruvate decarboxylase from Zymobacter palmae.

    PubMed

    Buddrus, Lisa; Andrews, Emma S V; Leak, David J; Danson, Michael J; Arcus, Vickery L; Crennell, Susan J

    2016-09-01

    Pyruvate decarboxylase (PDC; EC 4.1.1.1) is a thiamine pyrophosphate- and Mg(2+) ion-dependent enzyme that catalyses the non-oxidative decarboxylation of pyruvate to acetaldehyde and carbon dioxide. It is rare in bacteria, but is a key enzyme in homofermentative metabolism, where ethanol is the major product. Here, the previously unreported crystal structure of the bacterial pyruvate decarboxylase from Zymobacter palmae is presented. The crystals were shown to diffract to 2.15 Å resolution. They belonged to space group P21, with unit-cell parameters a = 204.56, b = 177.39, c = 244.55 Å and Rr.i.m. = 0.175 (0.714 in the highest resolution bin). The structure was solved by molecular replacement using PDB entry 2vbi as a model and the final R values were Rwork = 0.186 (0.271 in the highest resolution bin) and Rfree = 0.220 (0.300 in the highest resolution bin). Each of the six tetramers is a dimer of dimers, with each monomer sharing its thiamine pyrophosphate across the dimer interface, and some contain ethylene glycol mimicking the substrate pyruvate in the active site. Comparison with other bacterial PDCs shows a correlation of higher thermostability with greater tetramer interface area and number of interactions. PMID:27599861

  14. Crystal structure of pyruvate decarboxylase from Zymobacter palmae

    PubMed Central

    Buddrus, Lisa; Andrews, Emma S. V.; Leak, David J.; Danson, Michael J.; Arcus, Vickery L.; Crennell, Susan J.

    2016-01-01

    Pyruvate decarboxylase (PDC; EC 4.1.1.1) is a thiamine pyrophosphate- and Mg2+ ion-dependent enzyme that catalyses the non-oxidative decarboxylation of pyruvate to acetaldehyde and carbon dioxide. It is rare in bacteria, but is a key enzyme in homofermentative metabolism, where ethanol is the major product. Here, the previously unreported crystal structure of the bacterial pyruvate decarboxylase from Zymobacter palmae is presented. The crystals were shown to diffract to 2.15 Å resolution. They belonged to space group P21, with unit-cell parameters a = 204.56, b = 177.39, c = 244.55 Å and R r.i.m. = 0.175 (0.714 in the highest resolution bin). The structure was solved by molecular replacement using PDB entry 2vbi as a model and the final R values were R work = 0.186 (0.271 in the highest resolution bin) and R free = 0.220 (0.300 in the highest resolution bin). Each of the six tetramers is a dimer of dimers, with each monomer sharing its thiamine pyrophosphate across the dimer interface, and some contain ethylene glycol mimicking the substrate pyruvate in the active site. Comparison with other bacterial PDCs shows a correlation of higher thermostability with greater tetramer interface area and number of interactions. PMID:27599861

  15. Metasomatism in the oceanic lithosphere beneath La Palma, Canary Islands

    NASA Astrophysics Data System (ADS)

    Janisch, Astrid; Ntaflos, Theodoros

    2016-04-01

    La Palma is the most active island within the Canary archipelago with historical eruption along the Cumbre Vieja Rift. Mantle peridotite xenoliths brought to the surface during the eruption 1677/78 at the site of San Antonio Volcano, close to Fuencaliente in the south of the island, gives us an excellent opportunity to study an old oceanic lithosphere. The collection of xenoliths comprises sp-harzburgites, sp-lherzolites, sp-dunites and pyroxenites but only the first three were used for this work. Metasomatic processes are evident in all samples. A common feature is a variable channelling of melt flow through the mantle xenoliths displayed in variations from pervasively metasomatized, through veined to dyke intruded peridotites. Orthopyroxene breakdown into olivine, clinopyroxene and glass is evidence for anhydrous melt percolation. Furthermore, fine-grained veins in various thicknesses consisting of olivine, pyroxene as well as amphibole with apatite and phlogopite reveal additional anhydrous and hydrous metasomatic processes, respectively. Peridotites mainly influenced by anhydrous metasomatism exhibit locally phlogopite and/or amphibole around spinel or in glass-veinlets. Pentlandite has been found in all veined samples. Amphiboles are mostly pargasites but kaersutites are also present in the amphibole-bearing veins. Two different types of amphibole veins have been recognized. The first type is an amphibole-apatite-glass-bearing amphibolite, forming a cross-cutting vein that propagates through the xenolith. The amphiboles in this vein are coarse-grained while the disseminated amphiboles are fine-grained. Clinopyroxene always occurs in association with amphibole and in textural equilibrium suggesting that both minerals have grown together. The glass is of tephritic/basanitic to trachy-basaltic composition. The second amphibole-vein contains phlogopite and traces of apatite. Textural evidence (cross-cutting olivine grains and the absence of hydrous minerals in the

  16. The Morphometry of Lake Palmas, a Deep Natural Lake in Brazil

    PubMed Central

    Barroso, Gilberto F.; Gonçalves, Monica A.; Garcia, Fábio da C.

    2014-01-01

    Lake Palmas (A = 10.3km2) is located in the Lower Doce River Valley (LDRV), on the southeastern coast of Brazil. The Lake District of the LDRV includes 90 lakes, whose basic geomorphology is associated with the alluvial valleys of the Barreiras Formation (Cenozoic, Neogene) and with the Holocene coastal plain. This study aimed to investigate the relationship of morphometry and thermal pattern of a LDRV deep lake, Lake Palmas. A bathymetric survey carried out in 2011 and the analysis of hydrographic and wind data with a geographic information system allowed the calculation of several metrics of lake morphometry. The vertical profiling of physical and chemical variables in the water column during the wet/warm and dry/mild cold seasons of 2011 to 2013 has furnished a better understanding of the influence of the lake morphometry on its structure and function. The overdeepened basin has a subrectangular elongated shape and is aligned in a NW-SE direction in an alluvial valley with a maximum depth (Zmax) of 50.7m, a volume of 2.2×108 m3 (0.22km3) and a mean depth (Zmv) of 21.4m. These metrics suggest Lake Palmas as the deepest natural lake in Brazil. Water column profiling has indicated strong physical and chemical stratification during the wet/warm season, with a hypoxic/anoxic layer occupying one-half of the lake volume. The warm monomictic pattern of Lake Palmas, which is in an accordance to deep tropical lakes, is determined by water column mixing during the dry and mild cold season, especially under the influence of a high effective fetch associated with the incidence of cold fronts. Lake Palmas has a very long theoretical retention time, with a mean of 19.4 years. The changes observed in the hydrological flows of the tributary rivers may disturb the ecological resilience of Lake Palmas. PMID:25406062

  17. The morphometry of Lake Palmas, a deep natural lake in Brazil.

    PubMed

    Barroso, Gilberto F; Gonçalves, Monica A; Garcia, Fábio da C

    2014-01-01

    Lake Palmas (A = 10.3km2) is located in the Lower Doce River Valley (LDRV), on the southeastern coast of Brazil. The Lake District of the LDRV includes 90 lakes, whose basic geomorphology is associated with the alluvial valleys of the Barreiras Formation (Cenozoic, Neogene) and with the Holocene coastal plain. This study aimed to investigate the relationship of morphometry and thermal pattern of a LDRV deep lake, Lake Palmas. A bathymetric survey carried out in 2011 and the analysis of hydrographic and wind data with a geographic information system allowed the calculation of several metrics of lake morphometry. The vertical profiling of physical and chemical variables in the water column during the wet/warm and dry/mild cold seasons of 2011 to 2013 has furnished a better understanding of the influence of the lake morphometry on its structure and function. The overdeepened basin has a subrectangular elongated shape and is aligned in a NW-SE direction in an alluvial valley with a maximum depth (Zmax) of 50.7 m, a volume of 2.2×10(8) m3 (0.22 km3) and a mean depth (Zmv) of 21.4m. These metrics suggest Lake Palmas as the deepest natural lake in Brazil. Water column profiling has indicated strong physical and chemical stratification during the wet/warm season, with a hypoxic/anoxic layer occupying one-half of the lake volume. The warm monomictic pattern of Lake Palmas, which is in an accordance to deep tropical lakes, is determined by water column mixing during the dry and mild cold season, especially under the influence of a high effective fetch associated with the incidence of cold fronts. Lake Palmas has a very long theoretical retention time, with a mean of 19.4 years. The changes observed in the hydrological flows of the tributary rivers may disturb the ecological resilience of Lake Palmas. PMID:25406062

  18. Internet quality of service between the UK and La Palma in 1998 and 1999

    NASA Astrophysics Data System (ADS)

    McNerney, Paul; Steele, Iain A.

    2000-06-01

    The Liverpool telescope on La Palma will provide live images for planetarium shows in the Liverpool Museum in the UK. Data transfer will be achieved using the Internet. We implemented an automatic program of hourly ftp file transfers from La Palma to the UK throughout 1998 and 1999 to monitor the transfer rates achievable. We find that both the mean and minimum (on 9 out of 10 nights) transfer rates are a function of time of day on weekdays. In addition we find that the minimum transfer rate in early evening has increased from approximately 5 Kbytes/sec in 1998 to approximately 25 Kbytes/sec in 1999. This implies that a compression ratio of around 30:1 must be achieved to allow live display of 2048 X 2048 pixel CCD images in the UK within 10 seconds of the data being taken.

  19. Direct ethanol production from cellulosic materials by Zymobacter palmae carrying Cellulomonas endoglucanase and Ruminococcus β-glucosidase genes.

    PubMed

    Kojima, Motoki; Okamoto, Kenji; Yanase, Hideshi

    2013-06-01

    In order to reduce the cost of bioethanol production from lignocellulosic biomass, we conferred the ability to ferment cellulosic materials directly on Zymobacter palmae by co-expressing foreign endoglucanase and β-glucosidase genes. Z. palmae is a novel ethanol-fermenting bacterium capable of utilizing a broad range of sugar substrates, but not cellulose. Therefore, the six genes encoding the cellulolytic enzymes (CenA, CenB, CenD, CbhA, CbhB, and Cex) from Cellulomonas fimi were introduced and expressed in Z. palmae. Of these cellulolytic enzyme genes cloned, CenA degraded carboxymethylcellulose and phosphoric acid-swollen cellulose (PASC) efficiently. The extracellular CenA catalyzed the hydrolysis of barley β-glucan and PASC to liberate soluble cello-oligosaccharides, indicating that CenA is the most suitable enzyme for cellulose degradation among those cellulolytic enzymes expressed in Z. palmae. Furthermore, the cenA gene and β-glucosidase gene (bgl) from Ruminococcus albus were co-expressed in Z. palmae. Of the total endoglucanase and β-glucosidase activities, 57.1 and 18.1 % were localized in the culture medium of the strain. The genetically engineered strain completely saccharified and fermented 20 g/l barley β-glucan to ethanol within 84 h, producing 79.5 % of the theoretical yield. Thus, the production and secretion of CenA and BGL enabled Z. palmae to efficiently ferment a water-soluble cellulosic polysaccharide to ethanol.

  20. Study of the histopathological types of cutaneous melanoma in Palmas-TO from 2001 to 2011*

    PubMed Central

    da Costa, Nilo Fernandes; Fernandes, Nurimar Conceição; Borges, Myrlena Regina Machado Mescouto

    2015-01-01

    BACKGROUND Cutaneous melanoma (CM) is considered serious for causing frequent metastasis, presenting high mortality, resistance to available therapies and incidences in laboring activity. OBJECTIVES To study the histopathological types of cutaneous melanoma in Palmas-TO from 2001 to 2011, according to risk factors, location of lesions, Clark levels and Breslow thickness. METHODS A descriptive, retrospective and quantitative research in reports of the Serviços de Anatomia Patológica in Palmas (SAPP) and Registro de Câncer de Base Populacional de Palmas (RCBPP). RESULTS The years of highest incidences were: 2004 (8 cases/17.8%), 2008 and 2011 (7 cases each/15.6%) and 2010 (6 cases/13.3%). Among the 45 cases studied, there were predominance in patients between 41 and 60 years old, women, caucasians, farmers, located in trunk, in situ type, superficial extensive and metastatic cutaneous, Clark levels I (20%) and IV (17.7%), Breslow thickness ≤1 mm (35.5%) and 2.01 to 4 mm (24.4%). CONCLUSIONS The most common histopathological types were: cutaneous melanoma in situ, superficial extensive and metastatic, followed by nodular cutaneous melanoma, and finally, by other forms. In this study, Clark levels and Breslow thickness pointed to greater importance of thin melanomas and sun exposure without appropriate protection in farmers. PMID:26560208

  1. Stability analysis of Western flank of Cumbre Vieja volcano (La Palma) using numerical modelling

    NASA Astrophysics Data System (ADS)

    Bru, Guadalupe; Gonzalez, Pablo J.; Fernandez-Merodo, Jose A.; Fernandez, Jose

    2016-04-01

    La Palma volcanic island is one of the youngest of the Canary archipelago, being a composite volcano formed by three overlapping volcanic centers. There are clear onshore and offshore evidences of past giant landslides that have occurred during its evolution. Currently, the active Cumbre Vieja volcano is in an early development state (Carracedo et al., 2001). The study of flank instability processes aim to assess, among other hazards, catastrophic collapse and potential tsunami generation. Early studies of the potential instability of Cumbre Vieja volcano western flank have focused on the use of sparse geodetic networks (Moss et al. 1999), surface geological mapping techniques (Day et al. 1999) and offshore bathymetry (Urgeles et al. 1999). Recently, a dense GNSS network and satellite radar interferometry results indicate ground motion consistent with deep-seated creeping processes (Prieto et al. 2009, Gonzalez et al. 2010). In this work, we present a geomechanical advanced numerical model that captures the ongoing deformation processes at Cumbre Vieja. We choose the Finite Elements Method (FEM) which is based in continuum mechanics and is the most used for geotechnical applications. FEM has the ability of using arbitrary geometry, heterogeneities, irregular boundaries and different constitutive models representative of the geotechnical units involved. Our main contribution is the introduction of an inverse approach to constrain the geomechanical parameters using satellite radar interferometry displacements. This is the first application of such approach on a large volcano flank study. We suggest that the use of surface displacements and inverse methods to rigorously constrain the geomechanical model parameter space is a powerful tool to understand volcano flank instability. A particular important result of the studied case is the estimation of displaced rock volume, which is a parameter of critical importance for simulations of Cumbre Vieja tsunamigenic hazard

  2. Paleonutritional analysis on the prehispanic population from La Palma (Canary Islands).

    PubMed

    Pérez-González, E; Arnay-de-la-Rosa, M; González-Reimers, E; Galindo-Martín, L; Velasco-Vázquez, J

    2001-02-01

    In this study, we determine bone strontium, barium, and calcium, as well as zinc, copper, and iron, in prehispanic samples belonging to adult individuals from the two main funerary caves from La Palma (Espigón and Barranco Porto), comparing them with our own modern controls. We have found that the Ba/Sr molar ratio of the individuals from Barranco Porto are significantly lower than that of the individuals from Espigón, thus suggesting a consumption of a marine-based diet by the former.

  3. New A-DInSAR study of La Palma, Canary Islands, Spain. Results and interpretation.

    NASA Astrophysics Data System (ADS)

    Escayo, Joaquín; Bru, Guadalupe; Camacho, Antonio; Prieto, Juan F.; Mallorquí, Jordi J.; Fernández, José

    2016-04-01

    We present new results on the deformation field for La Palma Island in the Canary Archipelago using the complete archive of Envisat (2004-2010). The recent volcanic activity registered in La Palma (at historical and subhistorical times, there have been seven eruptions, in ca. A.D. 1480, 1585, 1646, 1677, 1712, 1949 and 1971) and the absence of any geodetic monitoring system implemented in the Island at the 90's converts A-DInSAR studies in an basic information source for the study of surface displacements. From late 90's several geodetic studies using GNSS, gravimetry and InSAR techniques has been carried out in the island (see Fernández et al., 2015 for a summary). We improve previous radar satellite results by increasing the temporal coverage and using more images, which generates a greater interferogram set, and using a recently developed A-DInSAR processing technique which includes an error estimation for the LOS mean velocity and deformation time series ("Subsidence" software, developed by the "Universitat Politècnica de Catalunya, see e.g., Blanco-Sánchez et al., 2008, and Centolanza, 2015). Our A-DInSAR results are compared with previous InSAR ones and with GNSS results obtained from campaigns. A discussion and interpretation of the results is also presented. Radar images have been provided by ESA through Cat.-1 13933 project.

  4. Sorption of U(VI) to G. uraniireducens and A. palmae under Old Rifle Conditions

    NASA Astrophysics Data System (ADS)

    Leavitt, J.; Cabaniss, S.; Howe, K.; Comolli, L.; Long, P.; Stucker, V.

    2011-12-01

    Microbial reduction as a remediation method for uranium contaminated Department of Energy (DOE) sites has been explored with promising results. Although transport models have been improved to include variations in geochemical concentration, reductive microbial processes and adsorption of uranium to minerals, they do not incorporate the presence of microbes as possible sorption surfaces that may influence the overall transport of uranium. Our overall objective is to examine U(VI) sorption to biomass by determining partition coefficients between U(VI) and the microbial species of Geobacter uraniireducens and Acholeplasma palmae. Once these partition coefficients are obtained, they will be incorporated into a thermodynamic model with the geochemical parameters of the Old Rifle Site. Preliminary results indicate that U(VI) sorbs 1000X more strongly to bacteria under atmospheric pCO2 conditions than under 2% pCO2 conditions. U(VI) sorption to the surface of G. uraniireducens is 4X stronger than to the surface of A. Palmae and in high-DIC waters is comparable in strength to reported U(VI)-mineral surface sorption. While the concentration of G. uraniireducens during and after remediation results in relatively small sorption site density, the possibility persists that sorption to G. uraniireducens may retard uranium transport at the geochemical gradients which exist in nature.

  5. Petrological and geochemical studies of mantle xenoliths from La Palma, Canary Islands

    NASA Astrophysics Data System (ADS)

    Janisch, Astrid; Ntaflos, Theodoros

    2015-04-01

    La Palma is the second youngest island, after El Hierro, of the Canary archipelago. The archipelago consists of seven large islands, forming an east-west-trending island chain, and several seamounts. All together they form a volcanic belt of around 800 km length and 450 km width, which presumably comprises roughly the Canary hotspot. The islands are located off the western coast of Morocco, Africa. The distance ranges from 100 km to 500 km. Concurrently with the distance, subaerial volcanism age progresses from the oldest lava in the east to the youngest in the west of the archipelago. Presently, La Palma is in the shield building stage of growth (alongside with El Hierro and Tenerife) and is furthermore the fastest growing island of the Canary archipelago. Historical volcanic eruptions are restricted on the younger islands, La Palma and El Hierro, with the last eruption at the south end of La Palma in 1971. Mantle xenoliths described in this work were collected at the slopes of San Antonio Volcano, Fuencaliente, brought to the surface during the 1677/1678 eruption. The mantle xenolith collection comprises sp-lherzolites, sp-harzburgites and pyroxenites. The texture can be distinguished between coarse-grained matrix and fine-grained veins in various thicknesses, mostly with olivine and pyroxene but also with amphibole, phlogopite as well as apatite. Mineral analyses reveal the existence of primary and secondary ol, cpx and opx. Primary ol has Fo contents of 89.2 to 91.7 and NiO ranging from 0.3 to 0.45 wt.%, whereas secondary ol show Fo values of 78.4 to 91.9 but with NiO below 0.3 wt.%. Primary cpx are predominantly Cr-Diopsides with En48.7-51.9-Wo43.5-44.3-Fs4.1-4.9 and Mg# of 91.5 to 92.4. Secondary cpx, primarily Ti-Augit, display En36.7-44.4-Wo47.7-49.6-Fs6.7-13.0 and Mg# of 75.3 to 90.8. Primary opx compositions are in range of En89.3-90.6-Wo1.3-1.5-Fs8.1-9.3 with Mg# between 90.7 and 92.0. Secondary opx exhibit En88.7-89.2-Wo1.7-1.9-Fs9.1-9.5 and Mg# of 90

  6. Polycyclic aromatic hydrocarbons in ambient air particles in the city of Las Palmas de Gran Canaria.

    PubMed

    Vera Castellano, A; López Cancio, J; Santana Alemán, P; Santana Rodríguez, J

    2003-07-01

    Concentration levels, seasonal variation and winter/summer ratios of 11 polycyclic aromatic hydrocarbons (PAHs) in the TSP of Las Palmas de Gran Canaria city were determined. The study area is under the influence of heavy traffic (80000 vehicles/day). Pyr/BaA, Pyr/Flt, B(ghi)P/I(cd)P and B(b+k)F/B(ghi)P ratios were calculated; the values of these two last suggest a strong influence of diesel fuel burning. Levels of TSP and TSP-bound PAHs were also established. The hazard potential of PAHs in terms of carcinogenicity of BaP is acceptable. Potential risk on the basis of TEFs is also studied. PMID:12705945

  7. pt5m - a 0.5 m robotic telescope on La Palma

    NASA Astrophysics Data System (ADS)

    Hardy, L. K.; Butterley, T.; Dhillon, V. S.; Littlefair, S. P.; Wilson, R. W.

    2015-12-01

    pt5m is a 0.5 m robotic telescope located on the roof of the 4.2 m William Herschel Telescope (WHT) building, at the Roque de los Muchachos Observatory, La Palma. Using a five-position filter wheel and CCD detector, and bespoke control software, pt5m provides a high-quality robotic observing facility. The telescope first began robotic observing in 2012, and is now contributing to transient follow-up and time-resolved astronomical studies. In this paper, we present the scientific motivation behind pt5m, as well as the specifications and unique features of the facility. We also present an example of the science we have performed with pt5m, where we measure the radius of the transiting exoplanet WASP-33b. We find a planetary radius of 1.603 ± 0.014RJ.

  8. Different decay patterns observed in a nineteenth-century building (Palma, Spain).

    PubMed

    Genestar, Catalina; Pons, Carmen; Cerro, José Carlos; Cerdà, Víctor

    2014-01-01

    The effects of atmospheric pollutants and climatic conditions were studied in a decayed column in the Seminary of Sant Pere. This nineteenth-century building is situated in the historic centre of Palma (Mallorca, Spain), less than 0.5 km from the sea. Samples were collected from the internal and external part of the crusts formed in the four sides of the column. The samples were analysed by means of thermal analysis, X-ray diffractometry, scanning electron microscopy, Fourier transform infrared spectroscopy and ion chromatography. Results show significant differences in the four sides of the column. A high degree of carbonate stone sulfation is observed in all of the samples analysed. A synergistic effect between atmospheric factors and micropollutants on the deterioration of stone is observed. A high uptake of atmospheric particulate matter is found in the external part of the black crusts. PMID:24705948

  9. Different decay patterns observed in a nineteenth-century building (Palma, Spain).

    PubMed

    Genestar, Catalina; Pons, Carmen; Cerro, José Carlos; Cerdà, Víctor

    2014-01-01

    The effects of atmospheric pollutants and climatic conditions were studied in a decayed column in the Seminary of Sant Pere. This nineteenth-century building is situated in the historic centre of Palma (Mallorca, Spain), less than 0.5 km from the sea. Samples were collected from the internal and external part of the crusts formed in the four sides of the column. The samples were analysed by means of thermal analysis, X-ray diffractometry, scanning electron microscopy, Fourier transform infrared spectroscopy and ion chromatography. Results show significant differences in the four sides of the column. A high degree of carbonate stone sulfation is observed in all of the samples analysed. A synergistic effect between atmospheric factors and micropollutants on the deterioration of stone is observed. A high uptake of atmospheric particulate matter is found in the external part of the black crusts.

  10. Grazing effects on species composition in different vegetation types (La Palma, Canary Islands)

    NASA Astrophysics Data System (ADS)

    Arévalo, J. R.; de Nascimento, L.; Fernández-Lugo, S.; Mata, J.; Bermejo, L.

    2011-05-01

    Grazing management is probably one of the most extensive land uses, but its effects on plant communities have in many cases been revealed to be contradictory. Some authors have related these contradictions to the stochastic character of grazing systems. Because of that, it is necessary to implement specific analyses of grazing effects on each community, especially in natural protected areas, in order to provide the best information to managers. We studied the effects of grazing on the species composition of the main vegetation types where it takes place (grasslands, shrublands and pine forests) on the island of La Palma, Canary Islands. We used the point-quadrat intersect method to study the species composition of grazed and ungrazed areas, which also were characterized by their altitude, distance to farms, distance to settlements, year of sampling, herbaceous aboveground biomass and soil organic matter. The variables organic matter, productivity and species richness were not significantly affected by grazing. The species composition of the analyzed plant communities was affected more by variables such as altitude or distance to farms than by extensive grazing that has been traditionally carried out on the island of La Palma involving certain practices such as continuous monitoring of animals by goat keepers, medium stocking rates adjusted to the availability of natural pastures, supplementation during the dry season using local forage shrubs or mown pastures and rotating animals within grazing areas Although some studies have shown a negative effect of grazing on endangered plant species, these results cannot be freely extrapolated to the traditional grazing systems that exert a low pressure on plant communities (as has been found in this study). We consider extensive grazing as a viable way of ensuring sustainable management of the studied ecosystems.

  11. Metallic species in atmospheric particulate matter in Las Palmas de Gran Canaria.

    PubMed

    Cancio, J López; Castellano, A Vera; Hernández, M Chaar; Bethencourt, R García; Ortega, E Macías

    2008-12-30

    In this work, we quantified the total, water-soluble and insoluble fractions of 12 metallic species (Na, Ca, K, Mg, Fe, Zn, Cr, Ni, Cu, Cd, Pb and Mn) present in total suspended particulates (TSP) in an urban area with heavy traffic (about 80 000 vehicles/day) of Las Palmas de Gran Canaria (Canary Islands). Experimental measurements were made from July to December 2003 on a total of 42 samples (7 per month). Particulate matter (TSP) was collected in fiber filters and high volume samplers. PM10 levels were estimated assuming the PM10 fraction is about 70% of all TSP. Total fractions was determined gravimetrically. Water-soluble fraction was extracted by sonication. Concentrations of metallic elements were analyzed by flame atomic absorption spectrophotometer. Temporal changes in the concentrations of the target elements were examined and a multivariate approach used to identify the primary sources for each species. Mean value for TSP is 71.92microg/m3. The water-soluble fraction consisted mainly of Na, Ca, Mg, and K. The insoluble fraction contained higher concentrations of all elements than the soluble except Na. In the water-soluble fraction, Na, K, Ca and Mg were found to come mainly from natural sources; Cr, Pb, Cd, Ni, Zn and Cu from anthropogenic sources. PMID:18440133

  12. Under the volcano: phylogeography and evolution of the cave-dwelling Palmorchestia hypogaea (Amphipoda, Crustacea) at La Palma (Canary Islands)

    PubMed Central

    Villacorta, Carlos; Jaume, Damià; Oromí, Pedro; Juan, Carlos

    2008-01-01

    Background The amphipod crustacean Palmorchestia hypogaea occurs only in La Palma (Canary Islands) and is one of the few terrestrial amphipods in the world that have adapted to a strictly troglobitic life in volcanic cave habitats. A surface-dwelling closely related species (Palmorchestia epigaea) lives in the humid laurel forest on the same island. Previous studies have suggested that an ancestral littoral Orchestia species colonized the humid forests of La Palma and that subsequent drought episodes in the Canaries reduced the distribution of P. epigaea favouring the colonization of lava tubes through an adaptive shift. This was followed by dispersal via the hypogean crevicular system. Results P. hypogaea and P. epigaea did not form reciprocally monophyletic mitochondrial DNA clades. They showed geographically highly structured and genetically divergent populations with current gene flow limited to geographically close surface locations. Coalescence times using Bayesian estimations assuming a non-correlated relaxed clock with a normal prior distribution of the age of La Palma, together with the lack of association of habitat type with ancestral and recent haplotypes, suggest that their adaptation to cave life is relatively ancient. Conclusion The data gathered here provide evidence for multiple invasions of the volcanic cave systems that have acted as refuges. A re-evaluation of the taxonomic status of the extant species of Palmorchestia is needed, as the division of the two species by habitat and ecology is unnatural. The information obtained here, and that from previous studies on hypogean fauna, shows the importance of factors such as the uncoupling of morphological and genetic evolution, the role of climatic change and regressive evolution as key processes in leading to subterranean biodiversity. PMID:18234125

  13. [Monthly changes in caloric values of five shrubby Palmae species leaves].

    PubMed

    Tan, Zhongqi; Lin, Yiming; Ding, Yin-long; Liao, Qiliao; Lin, Peng

    2004-07-01

    Studies on the monthly changes in the ash contents and caloric values of 5 shrubby Palmae species (Chamaerops humilis, Rhapis gracilis, Sabal minor, Chamaedorea cataractarum, Chamaedorea brachypoda) leaves showed that annual average ash content of the five shrubby species was 4.87% +/- 1.37% for Chamaerops humilis, 8.33% +/- 0.89% for Rhapis gracilis, 7.85% +/- 2.64% for Sabal minor, 9.20% +/- 1.35% for Chamaedorea cataractarum, and 12.42% +/- 1.78% for Chamaedorea brachypoda. The monthly changes of gross caloric value were different for Chamaerops humilis, Rhapis gracilis and Sabal minor, but similar to each other for Chamaedorea cataractarum and Chamaedorea brachypoda, and the annual average gross caloric value of the five shrubby species was 20.50 +/- 0.32 kJ x g(-1) for Chamaerops humilis, 20.04 +/- 0.50 kJ x g(-1) for Rhapis gracilis, 20.21 +/- 0.68 kJ x g(-1) for Sabal minor, 20.52 +/- 0.48 kJ x g(-1) for Chamaedorea cataractarum and 18.90 +/- 0.47 kJ x g(-1) for Chamaedorea brachypoda. The gross caloric values were correlated remarkably with ash contents for Chamaedorea cataractarum and Sabal minor (P < 0.05), but there was no significant correlation between gross caloric values and ash contents for other three species (P > 0.05). Rhapis gracilis and Sabal minor, and Chamaedorea cataractarum and Chamaedorea brachypoda had similar monthly changes in ash free caloric values, respectively. The average ash free caloric value of the five shrubby species was 21.55 +/- 0.53 kJ x g(-1) for Chamaerops humilis, 21.87 +/- 0.46 kJ x g(-1) for Rhapis gracilis, 21.84 +/- 0.53 kJ x g(-1) for Sabal minor, 22.60 +/- 0.81 kJ x g(-1) for Chamaedorea cataractarum, and 21.59 +/- 0.63 kJ x g(-1) for Chamaedorea brachypoda. Chamaedorea cataractarum had a higher ash free caloric value than other four species (P < 0.05), and the ash free caloric values of Chamaerops humilis, Rhapis gracilis, Sabal minor and Chamaedorea brachypoda were similar, the differences being not significant

  14. Geochemical and isotopic investigations of the Cumbre Vieja rift zone, La Palma (Canary Islands)

    NASA Astrophysics Data System (ADS)

    Johansen, T. S.; Hauff, F.; Hoernle, K.; Kokfelt, T. F.

    2003-04-01

    New major and trace element data, and Sr, Nd, Pb, U, Th and Ra isotopes have been generated for historic and prehistoric lavas from the Cumbre Vieja rift zone on La Palma in the Canary Islands. This is the most active area of the Canary Islands having hosted 7 historical eruptions. The prehistoric volcanism, which extends back to 123 ka, has been extensively age-dated making the Cumbre Vieja an ideal place to investigate the compositional evolution of an ocean island rift zone. The N-S elongated rift zone is traced 20 km on land and another ~15-20 km on its submarine extension towards the south. Our data show that the chemistry of the lavas is highly alkaline and forms a differentiation trend from very primitive basanite (mg# 65-74), via tephrite to phonolite. Along-axis variation of Sr-Nd-Pb isotopic compositions is limited indicating that the melts are derived from a single, relatively homogeneous mantle source, providing good opportunities to investigate melting processes, the timing of differentiation and/or assimilation of the volcanic edifice. Of particular interest is the complex 1585 A.D. eruption, where we discovered composite volcanic bombs that consist of basanitic margins and phonolitic cores. In one case, the phonolite was squeezed through a basanitic lid and cooling cracks in the bomb, providing clear evidence that the basanite and phonolite were both erupted as melts. Altered phonolitic blocks were also found that were partially molten along their edges by basanitic lava, suggesting that the phonolite blocks are older than the lava. The Sr-Nd-Pb isotope ratios of the 1585 A.D. samples overlap within analytical error indicating derivation from a common source and possibly from a common parental melt. The (230Th/238U) disequilibria of the basanites and phonolites are also similar within analytical error whereas the phonolites have distinctively higher 238U/232Th ratios. The higher 238U/232Th isotope ratios in the phonolites could be due to the

  15. Monitoring Cumbre Vieja volcano (La Palma, Canary Islands) from 2001 to 2015 by means of diffuse CO2 degassing

    NASA Astrophysics Data System (ADS)

    Padrón, Eleazar; Berry, Hannah; Robinson, Helen; Rodríguez, Fátima; Dionis, Samara; Pérez, Nemesio M.

    2016-04-01

    La Palma Island, the fifth longest (706 km2) and second highest (2,423 m asl) of the Canary Islands, is located at the northwestern end of the archipelago. Subaerial volcanic activity on La Palma started ˜2.0 My ago and has taken place exclusively at the southern part of the island in the last 123 ka, where Cumbre Vieja volcano, the most active basaltic volcano in the Canaries, has been constructed. Cumbre Vieja volcano, which has been likened to a Hawaiian-style rift zone, includes a main north-south rift zone 20 km long and up to 1,950 m in elevation, and covers 220 km2 with vents located also at the northwest and northeast. Nowadays, there are no visible gas emissions from fumaroles or hot springs at Cumbre Vieja, but large amounts of CO2 are released as diffuse soil emanations from the flanks of the volcano. Recent studies have shown that enhanced endogenous contributions of deep-seated CO2 might have been responsible for higher diffuse CO2 emission values (Padrón et al., 2015). We report here the latest results of the diffuse CO2 efflux survey at Cumbre Vieja volcano. The CO2 efflux measurements were taken using the accumulation chamber method in the summer period of 2015 to constrain the total CO2 output from the studied area and to evaluate occasional CO2 efflux surveys as a volcanic surveillance tool for Cumbre Vieja. Soil CO2 efflux values ranged from non-detectable up to 360 g m-2 d-1. Spatial distribution maps were constructed following the sequential Gaussian simulation (sGs) procedure. The spatial distribution of diffuse CO2 emission values did not seem to be controlled by the main structural features of the volcano since the highest values were measured in the southern part. The total CO2 output released to the atmosphere in a diffuse way has been estimated at 359 t d-1, which represents one of the lowest emission rates reported since 1997 (Padrón et al., 2015). Our results confirm the volcanic quiescence state of Cumbre Vieja, but reassert the

  16. Treatment of reducible unstable fractures of the distal radius in adults: a randomised controlled trial of De Palma percutaneous pinning versus bridging external fixation

    PubMed Central

    2010-01-01

    Background At present, there is no conclusive evidence regarding the best treatment method for reducible unstable fractures of the distal radius. This study compared the effectiveness of two methods used in surgical treatment of such fractures: percutaneous pinning and external fixation. Methods We randomly allocated 100 patients into two groups treated surgically with modified De Palma percutaneous pinning and bridging external fixation. Independent but not blinded evaluators administered the DASH quality-of-life questionnaire at postoperative months 6 and 24, performed functional assessment of pain, range of motion, and palm grip strength, and radiographic examinations (volar and radial angle, and height of the radius) before the operation, immediately afterwards, and at 6 and 24 months postoperative. Modified De Palma percutaneous pinning patients used an above-elbow cast whereas external fixation group had unrestricted elbow motion after surgery. Patients who for any reason demonstrated treatment failure or required additional interventions were followed up and their results were included in the group into which these patients had initially been randomised according to the intention-to-treat principle. A significance level of 5% (alpha = 0.05). was used for all statistical tests, such that tests presenting a p-value less than 0.05 were considered statistically significant. Results Ninety one (58.8 mean age and 66 participants were female) were included in the final assessment at 24 months. The DASH questionnaire evaluation showed a statistically significant result favouring the De Palma group (mean difference = -7.1 p = 0.044) after six months, but this was not maintained at 24 months. There were no statistically differences between the groups with respect to palm grip strength. Analysis of the range-of-motion limitation index (uninjured side minus affected side motion of) showed a statistical difference (mean difference = 2.4 p = 0.043) favoring the external

  17. S-rich apatite-hosted glass inclusions in xenoliths from La Palma: constraints on the volatile partitioning in evolved alkaline magmas

    NASA Astrophysics Data System (ADS)

    Parat, Fleurice; Holtz, François; Klügel, Andreas

    2011-09-01

    The composition of S-rich apatite, of volatile-rich glass inclusions in apatite, and of interstitial glasses in alkaline xenoliths from the 1949 basanite eruption in La Palma has been investigated to constrain the partitioning of volatiles between apatite and alkali-rich melts. The xenoliths are interpreted as cumulates from alkaline La Palma magmas. Apatite contains up to 0.89 wt% SO3 (3560 ppm S), 0.31 wt% Cl, and 0.66 wt% Ce2O3. Sulfur is incorporated in apatite via several independent exchange reactions involving (P5+, Ca2+) vs. (S6+, Si4+, Na+, and Ce3+). The concentration of halogens in phonolitic to trachytic glasses ranges from 0.15 to 0.44 wt% for Cl and from <0.07 to 0.65 wt% for F. The sulfur concentration in the glasses ranges from 0.06 to 0.23 wt% SO3 (sulfate-saturated systems). The chlorine partition coefficients (D{Cl/apatite/glass}) range from 0.4 to 1.3 (average D{Cl/apatite/glass} = 0.8), in good agreement with the results of experimental data in mafic and rhyolitic system with low Cl concentrations. With increasing F in glass inclusions D{F/apatite/glass} decreases from 35 to 3. However, most of our data display a high partition coefficient (~30) close to D{F/apatite/glass} determined experimentally in felsic rock. D{S/apatite/glass} decreases from 9.1 to 2.9 with increasing SO3 in glass inclusions. The combination of natural and experimental data reveals that the S partition coefficient tends toward a value of 2 for high S content in the glass (>0.2 wt% SO3). D{S/apatite/glass} is only slightly dependent on the melt composition and can be expressed as: SO3 apatite (wt%) = 0.157 * ln SO3 glass (wt%) + 0.9834. The phonolitic compositions of glass inclusions in amphibole and haüyne are very similar to evolved melts erupted on La Palma. The lower sulfur content and the higher Cl content in the phonolitic melt compared to basaltic magmas erupted in La Palma suggest that during magma evolution the crystallization of haüyne and pyrrhotite probably

  18. The performance of various palaeointensity techniques as a function of rock magnetic behaviour - A case study for La Palma

    NASA Astrophysics Data System (ADS)

    Monster, Marilyn W. L.; de Groot, Lennart V.; Biggin, Andrew J.; Dekkers, Mark J.

    2015-05-01

    Three different palaeointensity methods were applied to six historical and three carbon-dated flows from the island of La Palma (Spain); in total fifteen sites were processed. The two 20th-century flows were sampled at multiple locations as their obtained directions and intensities can be compared directly to those from the International Geomagnetic Reference Field (IGRF). After determination of the declinations and inclinations of the natural remanent magnetisation (NRM) by thermal and alternating-field demagnetisation, the samples were subjected to standard rock magnetic analyses to determine their Curie and alteration temperatures. Based on these characteristics, the sites were allocated to one of four rock magnetic groups labelled L∗, L, C, and H, a division primarily based on the temperature-dependent behaviour of the low-field susceptibility that has been used in studies of other volcanic edifices. Scanning electron microscope (SEM) observations revealed little oxidation and exsolution (oxidation classes I to III). Palaeointensities were determined using the classic Thellier-Thellier method (Aitken and IZZI protocols), the microwave method and the domain-state-corrected multispecimen method. Thellier-Thellier and microwave results were analysed using the ThellierTool A and B sets of selection criteria as modified by Paterson et al. (2014). Their combined success rate was around 40%. Of the eight IGRF sites, two yielded average intensities within 10% of the IGRF value. For the microwave method, three sites reproduced the IGRF intensity within 10%. In the domain-state-corrected multispecimen protocol, just one site (site 9, 1971) passed the 'ARM-test' (applied in retrospect) and showed less than 3% progressive alteration. Its multispecimen result reproduced the palaeofield within error. The other IGRF sites over- or underestimated the palaeofield by up to 50%. The seven older sites produced plausible palaeointensities, generally within a few μT of model data

  19. Proceedings of the International Association for Development of the Information Society (IADIS) International Conference on e-Learning (Las Palmas de Gran Canaria, Spain, July 21-24, 2015)

    ERIC Educational Resources Information Center

    Nunes, Miguel Baptista, Ed.; McPherson, Maggie, Ed.

    2015-01-01

    These proceedings contain the papers of the International Conference e-Learning 2015, which was organised by the International Association for Development of the Information and Society and is part of the Multi Conference on Computer Science and Information Systems (Las Palmas de Gran Canaria, Spain, July 21-24, 2015). The e-Learning 2015…

  20. Post-fire soil erosion on vineyards and canary pine-stands on the subtropical island of La Palma: scope of application of TLS?

    NASA Astrophysics Data System (ADS)

    Umstaedter, Kathrin; Haas, Florian; Becht, Michael

    2013-04-01

    Land use is considered as a main factor regarding post-fire soil erosion. Especially in the subtropical climate with extreme rainfall events in winter and drought periods during summer times, soil erosion can clearly exceed the soil reproduction rate. On the Canary Island of La Palma frequent wildfires and steep slopes contribute to a high likelihood of post-fire soil erosion. For a quantitative measurement of the erosion rate a terrestrial Laser Scanner with high resolution in combination with a dGPS is used. The main target of this study is to quantify the post-fire soil erosion rates on study sites with a different land use on the island of La Palma (Canary Islands). The investigation focuses on two land use forms; both are very common and widespread on the island: canary pine stands and vineyard areas. The study sites are characterized by a varying steepness, a different fire history (wildfires in 2000, 2009 and 2012) and different stages of soil development. Both denudation and gully erosion processes are spread over the sites. Intense precipitation events can trigger debris flows and extensive soil erosion on post-fire sites, like in the year 2009 in the south or in 2012 on the west and east side of La Palma. Regarding that, erosion is not just a problem for agriculture, but for the infrastructure. For our project we assume, that different topography, different land use and different forest fire history can result in a different soil erosion rate and type (gully incision, denudation processes). To calculate the post-fire erosion rates of the two land use forms, 24 study sites - 10 sites in vineyard areas, 14 in canary pines stands - were selected. By means of a 3D terrestrial Laser Scanner (Riegl LMS Z420i), high resolution digital terrain models of the study sites were compiled. The data acquisition was carried out in October 2011, May 2012 and December 2012 and subsequently the terrain models were compared. With this method not only erosion rates can be

  1. An Overview of the MOS Capabilities of the 4-10 m Telescopes at La Palma Observatory for Investigating Galaxy Clusters

    NASA Astrophysics Data System (ADS)

    Barrena, R.; Rubiño-Martín, J. A.; Streblyanska, A.; Ferragamo, A.

    2016-10-01

    La Palma Observatory offers four multi-object spectrographs installed on 4 and 10 m class telescopes. We present an overview of these four instruments. As a scientific case for two of them, we present the optical follow-up of Sunyaev-Zeldovich (SZ) sources undertaken by the Planck collaboration, focused on the detection, redshifts determination and mass estimation of the (SZ) galaxies cluster candidates. After three years of observations we have found optical counterparts for 120 candidates confirmed spectroscopically. We have determined dynamical masses for more than 30 systems with redshifts of z<0.85. Our experience demonstrates that DOLORES (TNG) and OSIRIS (GTC) are the ideal multi-object spectroscopy (MOS) instruments to investigate galaxy clusters at z<0.45 and 0.45

  2. Testing the Palma-Clary Reduced Dimensionality Model Using Classical Mechanics on the CH4 + H → CH3 + H2 Reaction.

    PubMed

    Vikár, Anna; Nagy, Tibor; Lendvay, György

    2016-07-14

    Application of exact quantum scattering methods in theoretical reaction dynamics of bimolecular reactions is limited by the complexity of the equations of nuclear motion to be solved. Simplification is often achieved by reducing the number of degrees of freedom to be explicitly handled by freezing the less important spectator modes. The reaction cross sections obtained in reduced-dimensionality (RD) quantum scattering methods can be used in the calculation of rate coefficients, but their physical meaning is limited. The accurate test of the performance of a reduced-dimensionality method would be a comparison of the RD cross sections with those obtained in accurate full-dimensional (FD) calculations, which is not feasible because of the lack of complete full-dimensional results. However, classical mechanics allows one to perform reaction dynamics calculations using both the RD and the FD model. In this paper, an RD versus FD comparison is made for the 8-dimensional Palma-Clary model on the example of four isotopologs of the CH4 + H → CH3 + H2 reaction, which has 12 internal dimensions. In the Palma-Clary model, the only restriction is that the methyl group is confined to maintain C3v symmetry. Both RD and FD opacity and excitation functions as well as differential cross sections were calculated using the quasiclassical trajectory method. The initial reactant separation has been handled according to our one-period averaging method [ Nagy et al. J. Chem. Phys. 2016, 144, 014104 ]. The RD and FD excitation functions were found to be close to each other for some isotopologs, but in general, the RD reactivity parameters are lower than the FD reactivity parameters beyond statistical error, and for one of the isotopologs, the deviation is significant. This indicates that the goodness of RD cross sections cannot be taken for granted. PMID:26918703

  3. Raman spectroscopic analysis of dragon's blood resins-basis for distinguishing between Dracaena(Convallariaceae), Daemonorops(Palmae) and Croton(Euphorbiaceae).

    PubMed

    Edwards, Howell G M; de Oliveira, Luiz F C; Prendergast, Hew D V

    2004-02-01

    "Dragon[prime or minute]s blood" is the name applied to the deep-red coloured resin obtained from various plants. The original source in Roman times, used by many cultures and esteemed for its depth of colour and mystical association, was the dragon tree Dracaena cinnabari(Convallariaceae), found only on the Indian Ocean island of Socotra, (Yemen). Additional sources emerged later, including another species of Dracaena, D. draco, from the Canary Islands and Madeira, and species in the genera Daemonorops(Palmae) from South East Asia and Croton(Euphorbiaceae) from tropical parts of both the New and Old Worlds. In this study, examples of dragon's blood resins from the Economic Botany Collections at the Royal Botanic Gardens, Kew, dating from 1851 to 1993, have been analysed non-destructively using Raman spectroscopy. The Raman spectra of well-documented, provenanced specimens have been used to establish the source of specimens of questionable or unknown origin. It has also been possible from the Raman spectra to indicate whether processing of the resins has been undertaken in the preparation of the specimens before their deposition at Kew.

  4. [The way we were. On the centenary of the first Spanish Congress of Paediatrics in Palma de Mallorca (1914-2014)].

    PubMed

    Ponte Hernando, F; Zafra Anta, M; Fernández Menéndez, J M; Gorrotxategi Gorrotxategi, P; Bassat, Q; Fernández Teijeiro, J J; de Arana Amurrio, J I; García Nieto, V

    2014-06-01

    Between the 19th and 25th April 1914, the First Spanish Congress of Paediatrics was held in Palma de Mallorca under the slogan "Protect the Children". The specialty had broken away a few years earlier from its secular connection with Obstetrics and Gynaecology, both in its teaching aspect as well as regarding healthcare. With the newly created Chairs in Childhood Diseases, in a way this Congress meant the coming-of age and debut int society of paediatrics in our country. Prof. Martínez Vargas, a university professor in Barcelona, was the Chairman, and soul of the congress. There was a need to face a very high rate of infant mortality. The Congress responded to that social and sanitary/health demand with the participation of over three hundred pediatricians, including foreign representatives from Belgium, France, Russia and Latin America. The activities were divided into four sections: Childcare, Child Medicine, Surgery and Health, and accredited lecturers gave master classes on the most pressing issues of child pathology of the time. One hundred years on, what we are today is the fruit gathered by those who preceded us. Some were brilliant figures in paediatrics and others, the majority, anonymous paediatricians. They dedicated their lives, their science and their best smile to child care. The way we were and the way we are. With legitimate pride and satisfaction, it is an honour for the Group on the History of Paediatrics and AEP Documentation to celebrate this centennial commemoration in the framework of the Annals of Paediatrics.

  5. Far-Field Tsunami Impact in the North Atlantic Basin from Large Scale Flank Collapses of the Cumbre Vieja Volcano, La Palma

    NASA Astrophysics Data System (ADS)

    Tehranirad, Babak; Harris, Jeffrey C.; Grilli, Annette R.; Grilli, Stephan T.; Abadie, Stéphane; Kirby, James T.; Shi, Fengyan

    2015-12-01

    In their pioneering work, Ward and Day suggested that a large scale flank collapse of the Cumbre Vieja Volcano (CVV) on La Palma (Canary Islands) could trigger a mega-tsunami throughout the North Atlantic Ocean basin, causing major coastal impact in the far-field. While more recent studies indicate that near-field waves from such a collapse would be more moderate than originally predicted by Ward and Day [Løvholt et al. (J Geophy Res 113:C09026, 2008); Abadie et al. (J Geophy Res 117:C05030, 2012)], these would still be formidable and devastate the Canary Island, while causing major impact in the far-field at many locations along the western European, African, and the US east coasts. Abadie et al. (J Geophy Res 117:C05030, 2012) simulated tsunami generation and near-field tsunami impact from a few CVV subaerial slide scenarios, with volumes ranging from 20 to 450 km^3; the latter representing the most extreme scenario proposed by Ward and Day. They modeled tsunami generation, i.e., the tsunami source, using THETIS, a 3D Navier-Stokes (NS) multi-fluid VOF model, in which slide material was considered as a nearly inviscid heavy fluid. Near-field tsunami impact was then simulated for each source using FUNWAVE-TVD, a dispersive and fully nonlinear long wave Boussinesq model [ Shi et al. (Ocean Modell 43-44:36-51, 2012); Kirby et al. (Ocean Modeling, 62:39-55, 2013)]. Here, using FUNWAVE-TVD for a series of nested grids of increasingly fine resolution, we model and analyze far-field tsunami impact from two of Abadie et al.'s extreme CVV flank collapse scenarios: (i) that deemed the most "credible worst case scenario" based on a slope stability analysis, with a 80 km^3 volume; and (ii) the most extreme scenario, similar to Ward and Day's, with a 450 km^3 volume. Simulations are performed using a one-way coupling scheme in between two given levels of nested grids. Based on the simulation results, the overall tsunami impact is first assessed in terms of maximum surface

  6. Palaeosecular variation recorded by 9 ka to 2.5-Ma-old lavas from Martinique Island: new evidence for the La Palma aborted reversal ˜617 ka ago

    NASA Astrophysics Data System (ADS)

    Tanty, Cyrielle; Carlut, Julie; Valet, Jean-Pierre; Germa, Aurélie

    2015-02-01

    Fifteen sites of lava flows from Martinique Island (FWI) have been selected to document the geomagnetic field in the Caribbean area over the past 2.5 Ma and further constrain the time-averaged field during this period. Identical characteristic directions were isolated using both AF and thermal stepwise demagnetization techniques in all flows. Nine mean-site directions have a normal polarity, while three others are reversed. The mean geomagnetic pole position obtained after reducing all directions to the same polarity is indistinguishable from the present north geographic pole. The dispersion is at least 8° larger than the values derived from the time-averaged field models and remains unexplained otherwise than resulting from the relatively small number of directions. The other three flows are characterized by large deviations from the expected north-south direction. One lava flow dated at 1.69 Ma (±0.02 Ma) is likely associated with a transitional field during the Gilsà subchron. The lava flow dated at 770 ka (±11 ka) coincides with the age of the Brunhes-Matuyama geomagnetic reversal and is also coeval with another intermediate flow of the same age found at Guadeloupe Island. The 617 ka (±52 ka) old unit is characterized by reversed directions that are evidently not related to the last reversal, but with other reversed polarity and transitional lava flows of the same age recorded, respectively at Mexico and La Palma island. We infer that the presence of reversed directions with the same age at distinct localities confirms that a short episode of reversed polarity has occurred during this period.

  7. PALM--a pattern language for molecular biology.

    PubMed

    Helgesen, C; Sibbald, P R

    1993-01-01

    This paper presents a new pattern language, PALM, for describing patterns in molecular biology sequences. The language is intended for representing knowledge about such patterns in a declarative, clear and concise way. It is also shown that its expressive power enables the definition of any regular or context free language, and also higher languages in the Chomsky hierarchy by parameter attachment, variables and procedural attachment. It is also possible to define approximate patterns. The language is rigorously defined, and several examples of its use and expressive power are given. PMID:7584333

  8. Ecology of Rhodnius robustus Larrousse, 1927 (Hemiptera, Reduviidae, Triatominae) in Attalea palm trees of the Tapajós River Region (Pará State, Brazilian Amazon)

    PubMed Central

    2014-01-01

    Background The rising number of acute cases of Chagas disease in the State of Pará, reported in the past two decades, has been associated, in part, with the ingestion of juice of local palm tree fruits, mainly açaí berry and bacaba. Near the study area, in Santarém, Pará State, an outbreak of Chagas disease has been notified and investigations suggest the consumption of bacaba juice as the main source of infection with T. cruzi. The purpose of this study is to assess the aspects associated to the ecology of Rhodnius robustus in palm trees of three communities of the Tapajós region, in the State of Pará, Brazil. Methods Palm trees were cut down and dissected to search for triatomines. DNA from triatomines was extracted to investigate natural infection by Trypanosoma cruzi and T. rangeli. For statistical analyzes, data from infestation of palm trees, as well as the rates of natural infection by T. cruzi and T. rangeli were compared by Chi-square test. Triatomine density values were analyzed by the nonparametric Kruskal Wallis test and then comparisons between each pair of variables were made by the Mann–Whitney test assuming a confidence interval of 95%. Results We dissected 136 palm trees, 60 at the end of the rainy period and 76 at the end of the dry period. Seventy-three of them (53.7%) were infested with triatomines and three species were found, namely: Rhodnius robustus, Rhodnius pictipes and Panstrongylus lignarius. We collected 743 triatomines, and R. robustus was predominant (n = 739). The identification of natural infection of the insects by trypanosomatids revealed that 125 triatomines were infected by T. cruzi, 69 by T. rangeli and 14 presented both parasites, indicating the presence of mixed infection in the same vector. Conclusion The results suggest that São Tomé is the community with greater density of triatomines and infestation of palm trees; also, it demonstrates the existence of an intense sylvatic cycle in the region, which demands intensive surveillance to prevent human transmission. PMID:24690302

  9. Chemical Composition and Antimicrobial Potential of Palm Leaf Extracts from Babaçu (Attalea speciosa), Buriti (Mauritia flexuosa), and Macaúba (Acrocomia aculeata)

    PubMed Central

    Mahmoud, Talal Suleiman; do Nascimento, Guilherme Nobre L.; da Silva, Juliana Fonseca Moreira

    2016-01-01

    Babaçu (A. speciosa), Buriti (M. flexuosa), and Macaúba (A. aculeata) are palm trees typical of the ecotone area between Cerrado and the Amazon rainforest. The purpose of this study was to evaluate the antimicrobial potential of the extracts prepared from the leaves of those palms as well as determine their chemical compositions. The ethanol extracts were prepared in a Soxhlet apparatus and tested by disk diffusion and agar dilution technique against Staphylococcus aureus, Enterococcus faecalis, Escherichia coli, Pseudomonas aeruginosa, Candida albicans, and Candida parapsilosis. However, there was no significant activity at concentrations of 25, 50, and 100 mg·Ml−1. Moreover, the phytochemical analysis revealed the presence of tannins, flavonoids, catechins, steroids, triterpenes, and saponins. Gas chromatography (GC/MS) analysis also identified organic acids, such as capric (decanoic) acid, lauric (dodecanoic) acid, myristic (tetradecanoic) acid, phthalic (1,2-benzenedicarboxylic) acid, palmitic (hexadecanoic) acid, stearic (octadecanoic) acid, linoleic (9,12-octadecadienoic) acid (omega-6), linolenic (octadecatrienoic) acid (omega-3), and the terpenes citronellol and phytol. Based on the chemical composition in the palm leaf extracts, the palms have the potential to be useful in the food, cosmetic, and pharmaceutical industries. PMID:27529077

  10. Chemical Composition and Antimicrobial Potential of Palm Leaf Extracts from Babaçu (Attalea speciosa), Buriti (Mauritia flexuosa), and Macaúba (Acrocomia aculeata).

    PubMed

    de Oliveira, Adriana Idalina Torcato; Mahmoud, Talal Suleiman; do Nascimento, Guilherme Nobre L; da Silva, Juliana Fonseca Moreira; Pimenta, Raphael Sanzio; de Morais, Paula Benevides

    2016-01-01

    Babaçu (A. speciosa), Buriti (M. flexuosa), and Macaúba (A. aculeata) are palm trees typical of the ecotone area between Cerrado and the Amazon rainforest. The purpose of this study was to evaluate the antimicrobial potential of the extracts prepared from the leaves of those palms as well as determine their chemical compositions. The ethanol extracts were prepared in a Soxhlet apparatus and tested by disk diffusion and agar dilution technique against Staphylococcus aureus, Enterococcus faecalis, Escherichia coli, Pseudomonas aeruginosa, Candida albicans, and Candida parapsilosis. However, there was no significant activity at concentrations of 25, 50, and 100 mg·Ml(-1). Moreover, the phytochemical analysis revealed the presence of tannins, flavonoids, catechins, steroids, triterpenes, and saponins. Gas chromatography (GC/MS) analysis also identified organic acids, such as capric (decanoic) acid, lauric (dodecanoic) acid, myristic (tetradecanoic) acid, phthalic (1,2-benzenedicarboxylic) acid, palmitic (hexadecanoic) acid, stearic (octadecanoic) acid, linoleic (9,12-octadecadienoic) acid (omega-6), linolenic (octadecatrienoic) acid (omega-3), and the terpenes citronellol and phytol. Based on the chemical composition in the palm leaf extracts, the palms have the potential to be useful in the food, cosmetic, and pharmaceutical industries.

  11. Chemical Composition and Antimicrobial Potential of Palm Leaf Extracts from Babaçu (Attalea speciosa), Buriti (Mauritia flexuosa), and Macaúba (Acrocomia aculeata).

    PubMed

    de Oliveira, Adriana Idalina Torcato; Mahmoud, Talal Suleiman; do Nascimento, Guilherme Nobre L; da Silva, Juliana Fonseca Moreira; Pimenta, Raphael Sanzio; de Morais, Paula Benevides

    2016-01-01

    Babaçu (A. speciosa), Buriti (M. flexuosa), and Macaúba (A. aculeata) are palm trees typical of the ecotone area between Cerrado and the Amazon rainforest. The purpose of this study was to evaluate the antimicrobial potential of the extracts prepared from the leaves of those palms as well as determine their chemical compositions. The ethanol extracts were prepared in a Soxhlet apparatus and tested by disk diffusion and agar dilution technique against Staphylococcus aureus, Enterococcus faecalis, Escherichia coli, Pseudomonas aeruginosa, Candida albicans, and Candida parapsilosis. However, there was no significant activity at concentrations of 25, 50, and 100 mg·Ml(-1). Moreover, the phytochemical analysis revealed the presence of tannins, flavonoids, catechins, steroids, triterpenes, and saponins. Gas chromatography (GC/MS) analysis also identified organic acids, such as capric (decanoic) acid, lauric (dodecanoic) acid, myristic (tetradecanoic) acid, phthalic (1,2-benzenedicarboxylic) acid, palmitic (hexadecanoic) acid, stearic (octadecanoic) acid, linoleic (9,12-octadecadienoic) acid (omega-6), linolenic (octadecatrienoic) acid (omega-3), and the terpenes citronellol and phytol. Based on the chemical composition in the palm leaf extracts, the palms have the potential to be useful in the food, cosmetic, and pharmaceutical industries. PMID:27529077

  12. VizieR Online Data Catalog: LMC star clusters catalog (Palma+, 2016)

    NASA Astrophysics Data System (ADS)

    Palma, T.; Gramajo, L. V.; Claria, J. J.; Lares, M.; Geisler, D.; Ahumada, A. V.

    2016-04-01

    We have compiled a catalogue including a total of 277 LMC SCs studied in the Washington system. All the photometric observations of these SCs were carried out at Cerro Tololo Inter-American Observatory (CTIO, Chile), using the Wahington C and T1 filters (Canterna 1976) and the Kron-Cousins R filter. (1 data file).

  13. New species of Uvariopsis (Annonaceae) and Laccosperma (Arecaceae/Palmae) from Monts de Cristal, Gabon

    PubMed Central

    Couvreur, Thomas L.P.; Niangadouma, Raoul

    2016-01-01

    Abstract Monts de Cristal National Park in northwest Gabon is one of the most species rich places in Central Africa. Here, we describe two new species, one in Annonaceae and one in palms. Uvariopsis citrata Couvreur & Niangadouma, sp. nov. is unique in the genus by emitting a strong lemon scent from the crushed leaves and young branches. Laccosperma cristalensis Couvreur & Niangadouma, sp. nov. is a rattan that lacks acanthophylls on the cirrus and has few pinnae. Complete descriptions, photographic illustrations, ecological information and preliminary IUCN conservation status are provided. For both species a data deficient (DD) status is proposed. These new species underline once again that the Monts de Cristal National Park is yet incompletely known botanically. PMID:27698570

  14. New species of Uvariopsis (Annonaceae) and Laccosperma (Arecaceae/Palmae) from Monts de Cristal, Gabon

    PubMed Central

    Couvreur, Thomas L.P.; Niangadouma, Raoul

    2016-01-01

    Abstract Monts de Cristal National Park in northwest Gabon is one of the most species rich places in Central Africa. Here, we describe two new species, one in Annonaceae and one in palms. Uvariopsis citrata Couvreur & Niangadouma, sp. nov. is unique in the genus by emitting a strong lemon scent from the crushed leaves and young branches. Laccosperma cristalensis Couvreur & Niangadouma, sp. nov. is a rattan that lacks acanthophylls on the cirrus and has few pinnae. Complete descriptions, photographic illustrations, ecological information and preliminary IUCN conservation status are provided. For both species a data deficient (DD) status is proposed. These new species underline once again that the Monts de Cristal National Park is yet incompletely known botanically.

  15. Phylogeography of the genus Podococcus (Palmae/Arecaceae) in Central African rain forests: Climate stability predicts unique genetic diversity.

    PubMed

    Faye, A; Deblauwe, V; Mariac, C; Richard, D; Sonké, B; Vigouroux, Y; Couvreur, T L P

    2016-12-01

    The tropical rain forests of Central Africa contain high levels of species diversity. Paleovegetation or biodiversity patterns suggested successive contraction/expansion phases on this rain forest cover during the last glacial maximum (LGM). Consequently, the hypothesis of the existence of refugia e.g. habitat stability that harbored populations during adverse climatic periods has been proposed. Understory species are tightly associated to forest cover and consequently are ideal markers of forest dynamics. Here, we used two central African rain forest understory species of the palm genus, Podococcus, to assess the role of past climate variation on their distribution and genetic diversity. Species distribution modeling in the present and at the LGM was used to estimate areas of climatic stability. Genetic diversity and phylogeography were estimated by sequencing near complete plastomes for over 120 individuals. Areas of climatic stability were mainly located in mountainous areas like the Monts de Cristal and Monts Doudou in Gabon, but also lowland coastal forests in southeast Cameroon and northeast Gabon. Genetic diversity analyses shows a clear North-South structure of genetic diversity within one species. This divide was estimated to have originated some 500,000years ago. We show that, in Central Africa, high and unique genetic diversity is strongly correlated with inferred areas of climatic stability since the LGM. Our results further highlight the importance of coastal lowland rain forests in Central Africa as harboring not only high species diversity but also important high levels of unique genetic diversity. In the context of strong human pressure on coastal land use and destruction, such unique diversity hotspots need to be considered in future conservation planning. PMID:27521478

  16. Phylogeography of the genus Podococcus (Palmae/Arecaceae) in Central African rain forests: Climate stability predicts unique genetic diversity.

    PubMed

    Faye, A; Deblauwe, V; Mariac, C; Richard, D; Sonké, B; Vigouroux, Y; Couvreur, T L P

    2016-12-01

    The tropical rain forests of Central Africa contain high levels of species diversity. Paleovegetation or biodiversity patterns suggested successive contraction/expansion phases on this rain forest cover during the last glacial maximum (LGM). Consequently, the hypothesis of the existence of refugia e.g. habitat stability that harbored populations during adverse climatic periods has been proposed. Understory species are tightly associated to forest cover and consequently are ideal markers of forest dynamics. Here, we used two central African rain forest understory species of the palm genus, Podococcus, to assess the role of past climate variation on their distribution and genetic diversity. Species distribution modeling in the present and at the LGM was used to estimate areas of climatic stability. Genetic diversity and phylogeography were estimated by sequencing near complete plastomes for over 120 individuals. Areas of climatic stability were mainly located in mountainous areas like the Monts de Cristal and Monts Doudou in Gabon, but also lowland coastal forests in southeast Cameroon and northeast Gabon. Genetic diversity analyses shows a clear North-South structure of genetic diversity within one species. This divide was estimated to have originated some 500,000years ago. We show that, in Central Africa, high and unique genetic diversity is strongly correlated with inferred areas of climatic stability since the LGM. Our results further highlight the importance of coastal lowland rain forests in Central Africa as harboring not only high species diversity but also important high levels of unique genetic diversity. In the context of strong human pressure on coastal land use and destruction, such unique diversity hotspots need to be considered in future conservation planning.

  17. Large bearings with incorporated gears, high stiffness, and precision for the Swedish Solar Telescope (SST) on La Palma

    NASA Astrophysics Data System (ADS)

    Hammerschlag, Robert H.; Bettonvil, Felix C. M.; Jägers, Aswin P. L.; Scharmer, Göran B.

    2006-06-01

    The 1-meter Swedish Solar Telescope (SST) obtains images of the solar surface with an unprecedented resolution of 0.1 arcsec. It consists of a relatively slender tower with on top only the vacuum turret for reflecting downward the solar beam and no protective dome. This is a favourable situation to get good local seeing. Just in the case of some wind, seeing is best for daytime observations, therefore the precision bearings and drives of the elevation- and azimuth axis of the turret have to be stiff against wind. This requires line contact between the meshing teeth of the large gear wheel and the pinion. High preload forces to achieve line contact are not allowed because of appearing stick-slip effects. To reduce the risk on stick-slip a special design of the teeth for high stiffness combined with low friction and smooth transition from one tooth to the next was made. Furthermore, extreme precision in the fabrication was pursued such that relatively small contact forces give already line contact. This required a special order of the successive fabrication steps of the combination of bearing and gear teeth. An additional problem was the relatively thin section of the bearings required for a compact turret construction, needed for best local seeing and minimum wind load. Solutions for all these problems will be discussed. For the large gears the exceptional good DIN quality class 4 for the pitch precision and straightness plus direction of the teeth faces was achieved.

  18. Gravity wave characteristics in the middle atmosphere during the CESAR campaign at Palma de Mallorca in 2011/2012: Impact of extratropical cyclones and cold fronts

    NASA Astrophysics Data System (ADS)

    Kramer, R.; Wüst, S.; Schmidt, C.; Bittner, M.

    2015-06-01

    Based on a measuring campaign which was carried out at Mallorca (39.6°N, 2.7°E) as cooperation between Agència Estatal de Meteorologia (AEMET) and Deutsches Zentrum für Luft- und Raumfahrt, engl. 'German Aerospace Center' (DLR) in 2011/2012 (September-January), 143 radiosondes (day and night) providing vertical temperature and wind profiles were released. Additionally, nocturnal mesopause temperature measurements with a temporal resolution of about 1 min were conducted by the infrared (IR) - Ground-based Infrared P-branch Spectrometer (GRIPS) during the campaign period. Strongly enhanced gravity wave activity in the lower stratosphere is observed which can be attributed to a hurricane-like storm (so-called Medicane) and to passing by cold fronts. Statistical features of gravity wave parameters including energy densitiy and momentum fluxes are calculated. Gravity wave momentum fluxes turned out being up to five times larger during severe weather. Moreover, gravity wave horizontal propagation characteristics are derived applying hodograph and Stokes parameter analysis. Preferred directions are of southeast and northwest due to prevailing wind directions at Mallorca.

  19. HEGRA Experiment

    NASA Astrophysics Data System (ADS)

    Murdin, P.

    2000-11-01

    The La Palma cosmic-ray observatory HEGRA (High-Energy Gamma-Ray Astronomy) is an air shower experiment, located at the OBSERVATORIO DEL ROQUE DE LOS MUCHACHOS (2200 m above sea level, 28.75°N, 17.89°W) on the Canary island of La Palma, and is operated by institutes from Germany, Spain and Yerevan....

  20. LOTUS NUV-Optical Spectroscopy of AG Peg

    NASA Astrophysics Data System (ADS)

    Steele, I. A.; Jermak, H. E.; Marchant, J. M.; Bates, S. D.

    2015-07-01

    We were alerted by Atel#7741to the ongoing outburst of the symbiotic nova AG Peg. This formed an ideal first science target for the new LOTUS NUV-optical spectrograph being commissioned at the Liverpool Telescope on La Palma.

  1. Spectroscopic classification of supernova candidates

    NASA Astrophysics Data System (ADS)

    Hodgkin, S. T.; Hall, A.; Fraser, M.; Campbell, H.; Wyrzykowski, L.; Kostrzewa-Rutkowska, Z.; Pietro, N.

    2014-09-01

    We report the spectroscopic classification of four supernovae at the 2.5m Isaac Newton Telescope on La Palma, using the Intermediate Dispersion Spectrograph and the R300V grating (3500-8000 Ang; ~6 Ang resolution).

  2. ASASSN-16hh Is a Type Ia SN Near Maximum

    NASA Astrophysics Data System (ADS)

    Bersier, D.

    2016-07-01

    We obtained a spectrum of the candidate supernova ASASSN-16hh/AT 2016daj (ATel #9254) with the SPRAT spectrograph mounted on the robotic 2m Liverpool Telescope at the Roque de los Muchachos observatory (La Palma).

  3. ASASSN-16hr Is a Type Ia SN Before Maximum

    NASA Astrophysics Data System (ADS)

    Bersier, D.

    2016-07-01

    We obtained a spectrum of the candidate supernova ASASSN-16hr/AT 2016eja (ATel #9270) with the SPRAT spectrograph mounted on the robotic 2m Liverpool Telescope at the Roque de los Muchachos observatory (La Palma).

  4. ASASSN-16hd Is a Type Ia SN About 16 Days Past Maximum

    NASA Astrophysics Data System (ADS)

    Bersier, D.

    2016-07-01

    We obtained a spectrum of the candidate supernova ASASSN-15hd (ATel #9227) with the SPRAT spectrograph mounted on the robotic 2m Liverpool Telescope at the Roque de los Muchachos observatory (La Palma).

  5. 76 FR 22677 - Endangered Species; File No. 14949

    Federal Register 2010, 2011, 2012, 2013, 2014

    2011-04-22

    ... Federal Register (75 FR 13488) that a request for a scientific research permit to take green and hawksbill... Archipelago, and the Tres Palmas reserve. In addition, researchers would monitor the prevalence...

  6. Diabetes Research Institute Foundation

    MedlinePlus

    ... Hope George Lopez DRI Invention Parents Empower Parents Stern Chairman Exenatide Avandia Distinguished Professor Drug Discovery Initiative ... Ph.D. Shari Messinger Cayetano, ME, Ph.D. Daniel H. Mintz, M.D. Bresta Miranda-Palma, M. ...

  7. VIP Visitors

    NASA Astrophysics Data System (ADS)

    Mendez, J.

    2003-12-01

    Anatoly Karpov, world chess champion 1975-85 and 1993-99, visited the William Herschel Telescope in November 2002 accompanied by the presidents of the chess federations of La Palma and of the Canary Islands.

  8. Arborescent palm seed morphology and seedling distribution.

    PubMed

    Salm, Rodolfo

    2005-11-01

    This study examines how the seed morphology of two large arborescent palms, Attalea maripa (Aubl.) Mart. and Astrocaryum aculeatum G. Mey, may affect their seed shadow in a seasonally dry Amazonian forest. In addition to being smaller and produced in larger numbers than those of A. aculeatum, A. maripa seeds also presented a substantially lower amount of nutritional reserves available for the embryo. However, A. maripa seedlings were found in much higher numbers than those of A. aculeatum. The results suggest that, within the spatial scale considered, the seed rain of A. maripa is more restricted to the area surrounding around reproductive conspecifics than that of A. aculeatum. Furthermore, in comparison with those of A. aculeatum, the smaller seeds of A. maripa might be less attractive to scatterhoarding rodents (e.g. Dasyprocta aguti). The pattern observed emphasizes the importance of scatterhoarding rodents as dispersers of large-seeded plant species in Neotropical forests. PMID:16532195

  9. Negative density dependence of seed dispersal and seedling recruitment in a neotropical palm.

    PubMed

    Jansen, Patrick A; Visser, Marco D; Joseph Wright, S; Rutten, Gemma; Muller-Landau, Helene C

    2014-09-01

    Negative density dependence (NDD) of recruitment is pervasive in tropical tree species. We tested the hypotheses that seed dispersal is NDD, due to intraspecific competition for dispersers, and that this contributes to NDD of recruitment. We compared dispersal in the palm Attalea butyracea across a wide range of population density on Barro Colorado Island in Panama and assessed its consequences for seed distributions. We found that frugivore visitation, seed removal and dispersal distance all declined with population density of A. butyracea, demonstrating NDD of seed dispersal due to competition for dispersers. Furthermore, as population density increased, the distances of seeds from the nearest adult decreased, conspecific seed crowding increased and seedling recruitment success decreased, all patterns expected under poorer dispersal. Unexpectedly, however, our analyses showed that NDD of dispersal did not contribute substantially to these changes in the quality of the seed distribution; patterns with population density were dominated by effects due solely to increasing adult and seed density. PMID:25039608

  10. Predominance of Trypanosoma cruzi I among Panamanian sylvatic isolates.

    PubMed

    Samudio, Franklyn; Ortega-Barría, Eduardo; Saldaña, Azael; Calzada, Jose

    2007-02-01

    Trypanosoma cruzi is throughout Panama, which is in agreement with the widespread of the sylvatic vectors implicated in the transmission. Eco-epidemiological changes in some regions of the country have led to a successful dissemination of the palm-tree Attalea butyracea and a possible adaptation of the primary vector of Chagas' disease to human settlements. These facts might increase both vector-human contact and human infection with different potentials T. cruzi genotypes and make therefore necessary a study to disclose Panamanian T. cruzi make-up. In this study, 71 T. cruzi isolates from Rhodnius pallescens were analyzed using mini-exon gene and sequence-characterized amplified region markers. The analyzed strains were T. cruzi lineage I. This finding along with prior results indicates that T. cruzi I is the principal genotype circulating in both sylvatic and domestic/peridomestic cycles and consequently responsible for the disease in the country.

  11. Rhodnius barretti, a new species of Triatominae (Hemiptera: Reduviidae) from western Amazonia.

    PubMed

    Abad-Franch, Fernando; Pavan, Márcio G; Jaramillo-O, Nicolás; Palomeque, Francisco S; Dale, Carolina; Chaverra, Duverney; Monteiro, Fernando A

    2013-01-01

    Rhodnius barretti, a new triatomine species, is described based on adult specimens collected in rainforest environments within the Napo ecoregion of western Amazonia (Colombia and Ecuador). R. barretti resembles Rhodnius robustus s.l., but mitochondrial cytochrome b gene sequences reveal that it is a strongly divergent member of the "robustus lineage", i.e., basal to the clade encompassing Rhodnius nasutus, Rhodnius neglectus, Rhodnius prolixus and five members of the R. robustus species complex. Morphometric analyses also reveal consistent divergence from R. robustus s.l., including head and, as previously shown, wing shape and the length ratios of some anatomical structures. R. barretti occurs, often at high densities, in Attalea butyracea and Oenocarpus bataua palms. It is strikingly aggressive and adults may invade houses flying from peridomestic palms. R. barretti must therefore be regarded as a potential Trypanosoma cruzi vector in the Napo ecoregion, where Chagas disease is endemic.

  12. Rhodnius barretti, a new species of Triatominae (Hemiptera: Reduviidae) from western Amazonia

    PubMed Central

    Abad-Franch, Fernando; Pavan, Márcio G; Jaramillo-O, Nicolás; Palomeque, Francisco S; Dale, Carolina; Chaverra, Duverney; Monteiro, Fernando A

    2013-01-01

    Rhodnius barretti , a new triatomine species, is described based on adult specimens collected in rainforest environments within the Napo ecoregion of western Amazonia (Colombia and Ecuador). R. barretti resembles Rhodnius robustus s.l. , but mitochondrial cytochrome b gene sequences reveal that it is a strongly divergent member of the “robustus lineage”, i.e., basal to the clade encompassing Rhodnius nasutus , Rhodnius neglectus , Rhodnius prolixus and five members of the R. robustus species complex. Morphometric analyses also reveal consistent divergence from R. robustus s.l. , including head and, as previously shown, wing shape and the length ratios of some anatomical structures. R. barretti occurs, often at high densities, in Attalea butyracea and Oenocarpus bataua palms. It is strikingly aggressive and adults may invade houses flying from peridomestic palms. R. barretti must therefore be regarded as a potential Trypanosoma cruzi vector in the Napo ecoregion, where Chagas disease is endemic. PMID:24473808

  13. Association of anthropogenic land use change and increased abundance of the Chagas disease vector Rhodnius pallescens in a rural landscape of Panama.

    PubMed

    Gottdenker, Nicole L; Calzada, José E; Saldaña, Azäel; Carroll, C Ronald

    2011-01-01

    Anthropogenic disturbance is associated with increased vector-borne infectious disease transmission in wildlife, domestic animals, and humans. The objective of this study was to evaluate how disturbance of a tropical forest landscape impacts abundance of the triatomine bug Rhodnius pallescens, a vector of Chagas disease, in the region of the Panama Canal in Panama. Rhodnius pallescens was collected (n = 1,186) from its primary habitat, the palm Attalea butyracea, in five habitat types reflecting a gradient of anthropogenic disturbance. There was a high proportion of palms infested with R. pallescens across all habitat types (range = 77.1-91.4%). Results show that disturbed habitats are associated with increased vector abundance compared with relatively undisturbed habitats. Bugs collected in disturbed sites, although in higher abundance, tended to be in poor body condition compared with bugs captured in protected forest sites. Abundance data suggests that forest remnants may be sources for R. pallescens populations within highly disturbed areas of the landscape.

  14. Negative density dependence of seed dispersal and seedling recruitment in a neotropical palm.

    PubMed

    Jansen, Patrick A; Visser, Marco D; Joseph Wright, S; Rutten, Gemma; Muller-Landau, Helene C

    2014-09-01

    Negative density dependence (NDD) of recruitment is pervasive in tropical tree species. We tested the hypotheses that seed dispersal is NDD, due to intraspecific competition for dispersers, and that this contributes to NDD of recruitment. We compared dispersal in the palm Attalea butyracea across a wide range of population density on Barro Colorado Island in Panama and assessed its consequences for seed distributions. We found that frugivore visitation, seed removal and dispersal distance all declined with population density of A. butyracea, demonstrating NDD of seed dispersal due to competition for dispersers. Furthermore, as population density increased, the distances of seeds from the nearest adult decreased, conspecific seed crowding increased and seedling recruitment success decreased, all patterns expected under poorer dispersal. Unexpectedly, however, our analyses showed that NDD of dispersal did not contribute substantially to these changes in the quality of the seed distribution; patterns with population density were dominated by effects due solely to increasing adult and seed density.

  15. [Investigation of vectors and reservoirs in an acute Chagas outbreak due to possible oral transmission in Aguachica, Cesar, Colombia].

    PubMed

    Soto, Hugo; Tibaduiza, Tania; Montilla, Marleny; Triana, Omar; Suárez, Diana Carolina; Torres Torres, Mariela; Arias, María Teresa; Lugo, Ligia

    2014-04-01

    Colombia recorded 11 cases of acute Chagas disease and 80 cases of oral contamination with Trypanosoma cruzi. The current study analyzes the entomological and parasitological characteristics of the outbreak in Aguachica, Cesar Department, in 2010. An interdisciplinary group of health professionals and regional university personnel conducted the laboratory tests in the patients and the investigation of the transmission focus. Eleven cases of acute Chagas diseases were detected in a single family in a dwelling with domiciliated triatomines and Rhodnius pallescens, Pantrongylus geniculatus, Eratyrus cuspidatus, and two Didelphis marsupialis opossums infected with T. cruzi in Attalea butyracea and Elaeis oleifera palm trees in the urban area of Aguachica. The study analyzes the role of R. pallescens and palm trees in the wild cycle of T. cruzi and in oral transmission of Chagas disease. Sporadic incursions by wild R. pallescens, P. geniculatus, and E. cuspidatus from the nearby palm trees into human dwellings may cause increasingly frequent outbreaks of oral Chagas disease.

  16. Acquisition: it's all in how you look at it.

    PubMed

    Kirchheimer, B

    1999-11-01

    In the world of hospitals acquisitions, getting the hospital would seem to be the goal. But that's not always true. Sometimes an acquisition is just a means to another end. That has been the case with La Palma (Calif.) Intercommunity Hospital, near Los Angeles, which has had three owners in the past year and is in the midst of a deal to be sold to a fourth. Its current and previous owners acknowledge that ownership of La Palma was not the ultimate motive for any of the deals to date, and the hospital was quickly peddled after each sale. Officials from the company now trying to buy La Palma, however, say the hospital is worth having. Whether that is true seems to depend on who is doing the talking.

  17. Concentration of Naegleria fowleri in natural waters used for recreational purposes in Sonora, Mexico (November 2007-October 2008).

    PubMed

    Lares-Villa, Fernando; Hernández-Peña, Claudia

    2010-09-01

    A survey was designed to know the concentration of Naegleria fowleri in recreational areas in Hornos, Sonora, during a year. Samples were taken monthly at La Isleta and Las Palmas and the total amoeba counts were obtained by the most probable number method (MPN). The identification of N. fowleri was made by PCR. The maximum concentration of total thermophilic amoebae was 9175 MPN/L for La Isleta and 3477 MPN/L for Las Palmas. Thermophilic Naegleria were present mainly during summer and fall. October's concentrations were up to 201 MPN/L, at both places. The maximum concentrations of N. fowleri were 201 MPN/L and 18 MPN/L for La Isleta and Las Palmas respectively, and were isolated from August to October. The presence of N. fowleri in these particular natural bodies of water reinforces the need for adaptation of preventive measures to avoid cases of primary amoebic meningoencephalitis.

  18. [Antibiotic use in the pediatric population: factors to consider].

    PubMed

    Quintana, V Olmo; Deniz, E Santana; Ortega, F Domínguez; Ramírez, S Domínguez; Pita, J Maturral; Castro, A de la Nuez

    2007-12-01

    The aim of this retrospective study was to analyze the use of antibiotics in pediatrics in the Canary Islands during the period 2001-2005. We used the defined daily dose (DDD) as a technical unit of measurement as well as the DDD/1000 habitants/day (DHD), following the ATC classification system. The demographic data were obtained from individual patient health cards assigned to the primary care pediatricians. During the period 2001-2005, the total number of prescriptions for antibiotics in pediatrics was 1,207,726 at a cost of 6,119,679 Euros to the Canarian Health Service in Tenerife and 4,808,654 Euros in Las Palmas. The annual number of DHD in the Canary Islands decreased from 103,044 in 2001 to 68,168 in 2005. The cost for 1000 inhabitants/day (CHD) was 27,686 Euros and 19,183 Euros in Tenerife and Las Palmas, respectively. In analyzing the therapeutic classes of antibiotics, we found that the consumption of broad-spectrum penicillins (amoxicillin) in Tenerife decreased, while in Las Palmas it remained stable. There was also a significant decrease in the use of tetracyclines in both provinces. The DHD of beta-lactamase inhibitors was more significantly reduced in Tenerife than in LPA. The consumption of cephalosporins, mainly cefixime, was high in Tenerife, while in Las Palmas the second-generation cephalosporins (cefuroxime and cefaclor) were widely consumed. The use of macrolide antibiotics gradually decreased. Interestingly, there were 7,939 prescriptions for fluoroquinolones (mainly ciprofloxacin) in Tenerife and 4,846 in Las Palmas (mainly norfloxacin and ciprofloxacin). There were differences in the prescribing practices between Tenerife and Gran Canaria that don't coincide with changes in the microbiological spectrum. Prescribing practices in Las Palmas are based on scientific data, probably because of the continuing education courses on antibiotherapy that began in 2003.

  19. Linking the Roque de los Muchachos Observatory with the local secondary schools

    NASA Astrophysics Data System (ADS)

    Méndez, J.; Lpiya Group

    2013-05-01

    In 2009 the participating organisations at the Roque de los Muchachos Observatory (La Palma, Spain) started a programme to reach every secondary school student from La Palma island every year. The programme was intended to offer a first-hand approach to the research world and an inspiring and fruitful experience to both students and teachers. Here we report on the first years of operation, our conclusions, and some ideas for the future. More information can be obtained at http://www.lpiya.org/nuestrosalumnos/

  20. Optical Photometry and Spectroscopy of V635 Cas / 4U0115+63

    NASA Astrophysics Data System (ADS)

    Steele, I. A.

    2016-06-01

    A programme of occasional monitoring of High Mass X-ray binary (HMXRB) stars is underway at the Liverpool Telescope (La Palma). The HMXRB 4U0115+63 has recently been reported in X-ray outburst (Atel #9149, Atel #9159).

  1. New insights on the occurrence of peperites and sedimentary deposits within the silicic volcanic sequences of the Paraná Magmatic Province, Brazil

    NASA Astrophysics Data System (ADS)

    Luchetti, A. C. F.; Nardy, A. J. R.; Machado, F. B.; Madeira, J. E. O.; Arnosio, J. M.

    2014-03-01

    The PMP (Paraná Magmatic Province) is characterized by lava flows of the Early Cretaceous Serra Geral Formation which covers about 75% of the Paraná Basin (southern and southeastern Brazil), composed of a thick (up to 1600 m) volcanic sequence formed by a succession of petrographically and geochemically distinct units of basic and silicic composition. The whole package must have been emplaced during approximately 3 million years of nearly uninterrupted activity. A few aeolian sandstone layers, indicating arid environmental conditions (the Botucatu Formation), are interlayered in the lower basalts. Above the basalts, the Palmas and Chapecó Members are composed of silicic volcanic rocks (quartz latites, dacites, rhyodacites and rhyolites) and basalts. This paper presents new evidence of sedimentation episodes separating silicic volcanic events, expressed by the occurrence of sedimentary deposits. Interaction between the volcanic bodies and the coeval unconsolidated sediments formed peperites. The sediments were observed between basaltic lava flows and silicic rocks or interlayered in the Palmas-type rocks, between the Chapecó-type rocks and overlying basaltic flows, between silicic bodies of the Palmas and Chapecó types, and interlayered within Palmas-type units. The observed structures indicate that the sediments were still wet and unconsolidated, or weakly consolidated, at the time of volcanism, which, coupled with the sediment features, reflect environmental conditions that are different from those characterizing the Botucatu arid conditions.

  2. Carlsberg Meridian Telescope

    NASA Astrophysics Data System (ADS)

    Murdin, P.

    2000-11-01

    A 7 in (17.8 cm) diameter refractor, formerly known as the Carlsberg Automatic Meridian Circle. It is part of the OBSERVATORIO DEL ROQUE DE LOS MUCHACHOS on La Palma and is dedicated to carrying out high-precision optical astrometry....

  3. English in Class and on the Go: Multimodal U-Learning

    ERIC Educational Resources Information Center

    García-Sánchez, Soraya

    2012-01-01

    This article aims to analyse different ubiquitous learning (u-Learning) platforms used when learning English as a Foreign Language (EFL) as part of the Modern Languages Degree at the Universidad de Las Palmas de Gran Canaria (ULPGC). The combination of face-to-face lessons with multimedia content and digital mediated learning allows today's native…

  4. Date palm production and pest management challenges

    Technology Transfer Automated Retrieval System (TEKTRAN)

    Abstract: Date palm, Phoenix dactylifera, is a monocotyledonous species belong- ing to the palm family (Arecaceae or Palmae) which is perennial and dioecious and cultivated mostly in the arid regions of the world. Date palm is important to the agrarian economy of several countries, with the ability ...

  5. Supernovae candidates Gaia16bic, Gaia16bib and Gaia16biv confirmed by Mercator/Maia imaging

    NASA Astrophysics Data System (ADS)

    Blanco-Cuaresma, S.; Roelens, M.; Semaan, T.; Palaversa, L.; Mowlavi, N.; Eyer, L.

    2016-09-01

    We report confirmation of Gaia Science Alerts supernovae candidates Gaia16bic, Gaia16bib and Gaia16biv. Images were obtained in G and R bands of the Maia instrument mounted to the Flemish 1.2m Mercator telescope at Roque de los Muchachos observatory, La Palma, Canary Islands, Spain, on 2016 September 20-22.

  6. Gaia16bhu, Gaia16bhk, Gaia16bho and Gaia16bhr transients confirmed by Mercator/Maia imaging

    NASA Astrophysics Data System (ADS)

    Blanco-Cuaresma, S.; Roelens, M.; Semaan, T.; Palaversa, L.; Mowlavi, N.; Eyer, L.

    2016-09-01

    We report confirmation of Gaia Science Alerts transients Gaia16bhu, Gaia16bhk, Gaia16bho and Gaia16bhr. Images were obtained in G and R bands of the Maia instrument mounted to the Flemish 1.2m Mercator telescope at Roque de los Muchachos observatory, La Palma, Canary Islands, Spain, on 2016 September 18-19.

  7. 31 CFR Appendix B to Chapter V - Alphabetical Listing of Vessels That Are the Property of Blocked Persons or Specially Designated...

    Code of Federal Regulations, 2010 CFR

    2010-07-01

    ... Iraqi State Enterprise for Water Transport ALEGRIA DE PIO CUBA Naviera Maritima de Arosa, Spain ALFARABI..., Spain LAURA I CUBA Panama Container ship 2213 1843 HP7988 Naviera Polovina S.A. fka LAURA LILAC ISLANDS... Org. of Iraqi Ports PALMA MOCHA CUBA Naviera Maritima de Arosa, Spain PILOT 393 IRAQ Iraq Service...

  8. Gaia16bhp, Gaia16bhq, Gaia16bht and Gaia16bhj transients confirmed by Mercator/Maia imaging

    NASA Astrophysics Data System (ADS)

    Blanco-Cuaresma, S.; Semaan, T.; Roelens, M.; Palaversa, L.; Mowlavi, N.; Eyer, L.

    2016-09-01

    We report confirmation of Gaia Science Alerts transients Gaia16bhp, Gaia16bhq, Gaia16bht and Gaia16bhj. Images were obtained in G and R bands of the Maia instrument mounted to the Flemish 1.2m Mercator telescope at Roque de los Muchachos observatory, La Palma, Canary Islands, Spain, on 2016 September 18-19.

  9. Gaia16bgx, Gaia16bhh, Gaia16bhg, Gaia16bhf and Gaia16bgw transients confirmed by Mercator/Maia imaging

    NASA Astrophysics Data System (ADS)

    Blanco-Cuaresma, S.; Semaan, T.; Roelens, M.; Palaversa, L.; Mowlavi, N.; Eyer, L.

    2016-09-01

    We report confirmation of Gaia Science Alerts transients Gaia16bgx, Gaia16bhh, Gaia16bhg, Gaia16bhf and Gaia16bgw. Images were obtained in G and R bands of the Maia instrument mounted to the Flemish 1.2m Mercator telescope at Roque de los Muchachos observatory, La Palma, Canary Islands, Spain, on 2016 September 15-17.

  10. 78 FR 47827 - Unblocking of Specially Designated Nationals and Blocked Persons Pursuant to the Cuban Assets...

    Federal Register 2010, 2011, 2012, 2013, 2014

    2013-08-06

    ...) (vessel) . 15. LAS COLORADOS Unknown vessel type (Naviera Maritima de Arosa, Spain) (vessel) . 16. LAURA I... Enterprises, Inc., Panama) (vessel) . 21. PALMA MOCHA Unknown vessel type (Naviera Maritima de Arosa, Spain) (vessel) . 22. PINO DEL AGUA Unknown vessel type (Naviera Maritima de Arosa, Spain) (vessel) . 23. RAHIM...

  11. VizieR Online Data Catalog: 72 faint CV candidates in CRTS (Breedt+, 2014)

    NASA Astrophysics Data System (ADS)

    Breedt, E.; Gansicke, B. T.; Drake, A. J.; Rodriguez-Gil, P.; Parsons, S. G.; Marsh, T. R.; Szkody, P.; Schreiber, M. R.; Djorgovski, S. G.

    2016-04-01

    We obtained identification spectra of a total of 72 faint CV candidates identified by the CRTS, using the Gran Telescopio Canarias (GTC; La Palma, Spain) and the Gemini telescopes (North: Mauna Kea, Hawaii and South: Cerro Pachon, Chile). The observations were carried out in service mode during 2010, 2011 and 2013. (5 data files).

  12. Gaia15agj in edge-on galaxy SDSS J095058.70+375758.8 confirmed by Mercator/Maia imaging

    NASA Astrophysics Data System (ADS)

    Anderson, R. I.; Palaversa, L.; Mowlavi, N.; Eyer, L.

    2015-06-01

    We report confirmation of Gaia Science Alerts transient Gaia15agj, detected by Gaia satelite on 2015 Jun 03 ca. 05 UT. Images were obtained in U, G, and R bands of the Maia instrument mounted to the Flemish 1.2m Mercator telescope at Roque de los Muchachos observatory, La Palma, Canary Islands, Spain, on 2015 June 09 ca.

  13. VizieR Online Data Catalog: Stellar cluster dynamical masses in NGC2903 (Hagele+, 2009)

    NASA Astrophysics Data System (ADS)

    Hagele, G. F.; Diaz, A. I.; Cardaci, M. V.; Terlevich, E.; Terlevich, R.

    2010-08-01

    The data were acquired in 2000 February using the two arms of the ISIS spectrograph attached to the 4.2-m William Herschel Telescope (WHT) of the Isaac Newton Group (ING) at the Roque de los Muchachos Observatory on the Spanish island of La Palma. (2 data files).

  14. Discovery of an Apparent Nova in M81 and an Increase of H-alpha Emission from PNV J09553488+6910194

    NASA Astrophysics Data System (ADS)

    Hornoch, K.; Vaduvescu, O.; Stoev, H.

    2014-03-01

    We report the discovery of an apparent nova in M81 on a co-added 2000-s narrow-band H-alpha CCD image taken with the 2.5-m Isaac Newton Telescope (INT) + WFC at La Palma under ~1.5" seeing on 2014 Mar. ...

  15. VizieR Online Data Catalog: Stellar cluster dynamical masses in NGC3310 (Hagele+, 2010)

    NASA Astrophysics Data System (ADS)

    Hagele, G. F.; Diaz, A. I.; Cardaci, M. V.; Terlevich, E.; Terlevich, R.

    2010-11-01

    The data were acquired in 2000 February using the two arms of the Intermediate dispersion Spectrograph and Imaging System (ISIS) attached to the 4.2-m William Herschel Telescope (WHT) of the Isaac Newton Group (ING) at the Roque de los Muchachos Observatory on the Spanish island of La Palma. (2 data files).

  16. Core Directions in Human Resource Development.

    ERIC Educational Resources Information Center

    1999

    The first of the four papers in this symposium, "Examination of Critical Issues for Development and Implementation of Online Instruction" (Scott D. Johnson, Nilda Palma-Rivas, Chanidprapa Suriya, Steve Downey), reports on a descriptive and exploratory study that examined several critical issues affecting the development of online instructional…

  17. Characterising atmospheric optical turbulence using stereo-SCIDAR

    NASA Astrophysics Data System (ADS)

    Osborn, James; Butterley, Tim; Föhring, Dora; Wilson, Richard

    2015-04-01

    Stereo-SCIDAR (SCIntillation Detection and Ranging) is a development to the well known SCIDAR method for characterisation of the Earth's atmospheric optical turbulence. Here we present some interesting capabilities, comparisons and results from a recent campaign on the 2.5 m Isaac Newton Telescope on La Palma.

  18. Strong H-alpha Emission Detected in the M33 Nova Candidate PNV J01340288+3035111

    NASA Astrophysics Data System (ADS)

    Hornoch, K.; Vaduvescu, O.; Tudor, V.

    2014-07-01

    We obtained four 240-s narrow-band H-alpha and four 120-s R-band CCD frames of M33 on 2014 July 29.206 and 29.222 UT, respectively, with the 2.5-m Isaac Newton Telescope (INT) + WFC at La Palma under ~1.1" seeing.

  19. Follow-up photometry of iPTF16geu

    NASA Astrophysics Data System (ADS)

    Lee, C.-H.

    2016-10-01

    We report follow-up photometry of the strongly lensed SNIa iPTF16geu (ATel #9603, #9626). We observed iPTF16geu on 2016/10/17 with the 2.5-m Isaac Newton Telescope (INT) + WFC at La Palma, under ~0.9" seeing condition.

  20. Discovery of an Apparent Nova in M81

    NASA Astrophysics Data System (ADS)

    Hornoch, K.; Alfaro, M. Diaz; Ordonez-Etxeberria, I.; Vaduvescu, O.

    2015-01-01

    We report the discovery of an apparent nova in M81 on a co-added 1600-s narrow-band H-alpha CCD image taken with the 2.5-m Isaac Newton Telescope (INT) + WFC at La Palma under ~2.4" seeing on 2015 Jan. 15.126 UT.

  1. Discovery of a Probable Nova in M81

    NASA Astrophysics Data System (ADS)

    Hornoch, K.; Vaduvescu, O.; Mocnik, T.

    2014-09-01

    We report the discovery of a probable nova in M81 on a co-added 1440-s narrow-band H-alpha CCD image taken with the 2.5-m Isaac Newton Telescope (INT) + WFC at La Palma under ~2.2" seeing on 2014 Sep.

  2. VizieR Online Data Catalog: Probing the Local Bubble with DIBs. III. (Farhang+, 2015)

    NASA Astrophysics Data System (ADS)

    Farhang, A.; Khosroshahi, H. G.; Javadi, A.; van Loon, J. Th.

    2015-03-01

    All of the observations have been obtained with the Intermediate Dispersion Spectrograph (IDS) at the 2.5m Isaac Newton Telescope at the Roque de Los Muchachos in La Palma; with spectra in the 5750-6040Å region at spectral resolutions of R~2000 (or a velocity resolution of Δv=150km/s). (1 data file).

  3. Discovery of a Probable Nova in M33

    NASA Astrophysics Data System (ADS)

    Hornoch, K.; Vaduvescu, O.; Tudor, V.

    2014-08-01

    We report the discovery of a probable nova in M33 on co-added 960-s narrow-band H-alpha and 480-s R-band CCD images taken with the 2.5-m Isaac Newton Telescope (INT) + WFC at La Palma under ~1.1" seeing on 2014 July 29.206 and 29.222 UT, respectively.

  4. KIC 10526294: a slowly rotating B star with rotationally split, quasi-equally spaced gravity modes (Corrigendum)

    NASA Astrophysics Data System (ADS)

    Pápics, P. I.; Moravveji, E.; Aerts, C.; Tkachenko, A.; Triana, S. A.; Bloemen, S.; Southworth, J.

    2014-10-01

    Based on observations made with the William Herschel Telescope operated by the Isaac Newton Group on the island of La Palma at the Spanish Observatorio del Roque de los Muchachos of the Instituto de Astrofísica de Canarias.Appendices are available in electronic form at http://www.aanda.org

  5. Discovery of an Apparent Nova in M81 and H-alpha Confirmation of Three M81 Nova Candidates

    NASA Astrophysics Data System (ADS)

    Hornoch, K.; Vaduvescu, O.; Tudor, V.

    2014-06-01

    We report the discovery of an apparent nova in M81 on a co-added 2000-s narrow-band H-alpha CCD image taken with the 2.5-m Isaac Newton Telescope (INT) + WFC at La Palma under ~1.6" seeing on 2014 Jun. ...

  6. Discovery of a Probable Nova in M81 and Photometry of Three M81 Novae

    NASA Astrophysics Data System (ADS)

    Hornoch, K.; Errmann, R.; Carlisle, Ch.; Vaduvescu, O.

    2015-02-01

    We report the discovery of a probable nova in M81 on a co-added 1600-s narrow-band H-alpha CCD image taken with the 2.5-m Isaac Newton Telescope (INT) + WFC at La Palma under ~1.6" seeing on 2015 Jan.

  7. Texts Adopted at Meetings of the European Ministers Responsible for Sport. 1975-86.

    ERIC Educational Resources Information Center

    Council of Europe, Strasbourg (France).

    This monograph presents resolutions passed by conferences of European ministers responsible for sport in five meetings from 1975 to 1986. The meetings were held in Brussels, London, Palma de Majorca, Malta, and Dublin. Reported also are declarations, press communiques, and resolutions issued by informal working parties and informal meetings of…

  8. 77 FR 39959 - Draft Guidance To Implement Requirements for the Treatment of Air Quality Monitoring Data...

    Federal Register 2010, 2011, 2012, 2013, 2014

    2012-07-06

    ... information is not publicly available, e.g., CBI or other information whose disclosure is restricted by...: Beth W. Palma, U.S. EPA, Office of Air ] Quality Planning and Standards, Air Quality Policy Division... the following address: Roberto Morales, U.S. EPA, Office of Air Quality Planning and Standards,...

  9. Spectral classification of the recurrent nova M31N 1990-10a during its 2016 eruption with WHT/ACAM

    NASA Astrophysics Data System (ADS)

    Ederoclite, A.; Henze, M.; Aguado, D.; Allende, C.; Williams, S.; Darnley, M. J.; Sala, G.; Shafter, A. W.; Hornoch, K.

    2016-07-01

    An optical spectrum of the fast recurrent nova candidate M31N 1990-10a (see ATels #9276,#9280) was obtained on 2016-07-30.11 UT with the ACAM instrument on the 4m William Herschel Telescope at the Roque de los Muchachos Observatory (located in La Palma, Spain).

  10. Virtual Classroom for Business Planning Formulation.

    ERIC Educational Resources Information Center

    Osorio, J.; Rubio-Royo, E.; Ocon, A.

    One of the most promising possibilities of the World Wide Web resides in its potential to support distance education. In 1996, the University of Las Palmas de Gran Canaria developed the "INNOVA Project" in order to promote Web-based training and learning. As a result, the Virtual Classroom Interface (IVA) was created. Several software tools for…

  11. Discovery of an Apparent Nova in M81 and H-alpha Confirmation of PNV J09560160+6903126 and PNV J09553945+6905557

    NASA Astrophysics Data System (ADS)

    Hornoch, K.; Stoev, H.; Tudor, V.; Vaduvescu, O.; Frigo, M.

    2014-05-01

    We report the discovery of an apparent nova in M81 galaxy on a co-added 2000-s narrow-band H-alpha CCD image taken with the 2.5-m Isaac Newton Telescope (INT) + WFC at La Palma under ~1.2" seeing on 2014 May 26.923 UT. ...

  12. Helminth-related Eosinophilia in African Immigrants, Gran Canaria

    PubMed Central

    Pardo, Javier; Carranza, Cristina; Muro, Antonio; Angel-Moreno, Alfonso; Martín, Antonio-Manuel; Martín, Teresa; Hernández-Cabrera, Michele

    2006-01-01

    Of 788 recent African adult immigrants to Las Palmas de Gran Canaria, 213 (27.0%) had eosinophilia. The most frequent causes were filariasis (29.4%), schistosomiasis (17.2%), and hookworm infection (16.8%). Stool microscopy and filarial and schistosomal serologic tests gave the highest diagnostic yield. Country of origin and eosinophil count were associated with specific diagnoses. PMID:17176579

  13. First report of 'Candidatus Liberibacter solanacearum' on tomato in El Salvador

    Technology Transfer Automated Retrieval System (TEKTRAN)

    In April of 2012, tomato plants grown near the town of Yuroconte in the municipality of La Palma in El Salvador, were observed with symptoms resembling those of “Candidatus Liberibacter solanacearum” (Lso) infection. Disease incidence in several fields in the area ranged from 40 to 60%. Heavy infes...

  14. Role of U(VI) Adsorption in U(VI) Reduction by Geobacter Species.

    SciTech Connect

    None, None

    2009-03-09

    Previous work had suggested that Acholeplasma palmae has a higher capacity for uranium sorption than other bacteria studied. Sorption studies were performed with cells in suspension in various solutions containing uranium and results were used to generate uranium-biosorption isotherms.

  15. A new species of Spiroberotha Adams 1989 (Neuroptera: Berothidae) and the first record of the genus in Brazil.

    PubMed

    Machado, Renato Jose Pires; Krolow, Tiago Kütter

    2016-01-01

    The genus Spiroberotha Adams, 1989 is classified in Berothidae (Neuroptera) with two described species: S. fernandezi Adams, 1989 from Venezuela and S. sanctarosae Adams, 1989 from Colombia, Costa Rica and Venezuela. Here we describe a new species, S. tocantinensis n. sp., from Palmas, Tocantins, Brazil. This is the first record of the genus in Brazil, extending its geographical distribution. PMID:27394485

  16. Spectroscopic confirmation and additional photometry of the M31 nova candidate PNV J00423972+4120117

    NASA Astrophysics Data System (ADS)

    Sala, G.; Rodriguez-Gil, P.; Henze, M.; Shore, S. N.; Hernanz, M.; Casares, J.; Hornoch, K.; Skarka, M.; Vrastil, J.; Kucakova, H.; Rezba, L.; Wolf, M.

    2014-10-01

    We report the spectroscopic confirmation of the M31 nova candidate PNV J00423972+4120117 (#ATel 6563). The object was observed on 2014 Oct 16.88 (UT) with the 4.2-m William Herschel Telescope on La Palma using the ACAM imager/spectrograph with the V400 grism and the 1.5-arcsec slit.

  17. VizieR Online Data Catalog: SWEETCat I. Stellar parameters for host stars (Santos+, 2013)

    NASA Astrophysics Data System (ADS)

    Santos, N. C.; Sousa, S. G.; Mortier, A.; Neves, V.; Adibekyan, V.; Tsantaki, M.; Delgado Mena, E.; Bonfils, X.; Israelian, G.; Mayor, M.; Udry; S.

    2013-07-01

    The file sweetcat.dat contains the spectroscopic parameters for all the planet hosts compiled for this work (data as of July 2013). Up to date tables can be found at http://www.astro.up.pt/resources/sweet-cat . The spectra were gathered through observations, made by our team, and by the use of the ESO archive. In total, six different spectrographs were used: FEROS (2.2m ESO/MPI telescope, La Silla, Chile), FIES (Nordic Optical Telescope, La Palma, Spain), HARPS (3.6m ESO telescope, La Silla, Chile), SARG (TNG Telescope, La Palma, Spain), SOPHIE (1.93m telescope, OHP, France), and UVES (VLT Kueyen telescope, Paranal, Chile). (2 data files).

  18. ÔA large chunk of glassÕ: The 98-inch mirror of the Isaac Newton Telescope, 1945-1959

    NASA Astrophysics Data System (ADS)

    Macdonald, L. T.

    2012-01-01

    The Isaac Newton Telescope (INT) was completed in 1967 at Herstmonceux in southern England, headquarters of the Royal Greenwich Observatory, and was used there by professional astronomers for twelve years before being dismantled and moved to La Palma in the Canary Islands, where it remains a working telescope to this day. When it was moved to La Palma, the telescope was fitted with a new primary mirror. The original mirror, which was used throughout the Herstmonceux years, was obtained as a gift in the late 1940s from the University of Michigan in the United States. This paper records the troubled early history of this mirror and how it was nearly abandoned more than once, and tries to set its history in the political and economic context of mid-twentieth-century Britain as well as the history of astronomy.

  19. Molecular phylogenetics of Micromeria (Lamiaceae) in the Canary Islands, diversification and inter-island colonization patterns inferred from nuclear genes.

    PubMed

    Puppo, Pamela; Curto, Manuel; Gusmão-Guedes, Joana; Cochofel, Jaqueline; Pérez de Paz, Pedro Luis; Bräuchler, Christian; Meimberg, Harald

    2015-08-01

    Here we reconstruct the evolutionary history of Micromeria in the Canary Islands using eight nuclear markers. Our results show two centers of diversification for Micromeria, one in the eastern islands Gran Canaria and Lanzarote, the other in the western islands, Tenerife, La Palma and El Hierro. Suggested directions of inter-island colonization are the following: Gran Canaria to Lanzarote and La Gomera; Tenerife to La Palma (from the paleoisland of Teno), to El Hierro (from the younger, central part), and to La Gomera and Madeira (from the paleoislands). Colonization of La Gomera probably occurred several times from Gran Canaria and Tenerife. The taxonomic implications of these results are discussed. Incongruence among the different markers was evaluated and, using next generation sequencing, we investigated if this incongruence is due to gene duplication.

  20. The M31 field object iPTF14gnj is not a nova

    NASA Astrophysics Data System (ADS)

    Sala, G.; Rodriguez-Gil, P.; Henze, M.; Shore, S. N.; Hernanz, M.

    2014-11-01

    We report spectroscopic observations that show that the possible nova in the M31 field iPTF14gnj, announced in ATel #6567, is not a nova. The object was observed on 2014 Oct 16.88 (UT) with the 4.2-m William Herschel Telescope on La Palma using the ACAM imager/spectrograph with the V400 grism and the 1.5-arcsec slit.

  1. Spectral Classification of MASTER OT J015539.85+485955.6 as a dwarf nova

    NASA Astrophysics Data System (ADS)

    Piascik, A. S.; Steele, I. A.

    2015-11-01

    MASTER OT J015539.85+485955.6 was identified as either a possible supernova candidate in PGC212862 or a galactic dwarf nova in outburst in Atel #8262. The transient was observed using the SPRAT spectrograph of the Liverpool Telescope (La Palma) with a spectral range of 4000 - 8000 Angstroms and a resolution R=350 on 2015-11-09 at 22:40UT.

  2. Conference Discussion: The Challenges in Multi-Object Spectroscopy Instrument and Survey Design, and in Data Processing and Analysis

    NASA Astrophysics Data System (ADS)

    Balcells, M.; Skillen, I.

    2016-10-01

    The final session of the conference Multi-Object Spectroscopy in the Next Decade: Big Questions, Large Surveys, and Wide Fields, held in La Palma 2-6 March 2015, was devoted to a discussion of the challenges in designing and operating the next-generation survey spectrographs, and planning and carrying out their massive surveys. The wide-ranging 1.5-hour debate was recorded on video tape, and in this paper we report the edited transcription of the dialog.

  3. H-alpha Confirmation of Seven Nova Candidates in M31

    NASA Astrophysics Data System (ADS)

    Hornoch, K.; Vaduvescu, O.; Zurita, C.

    2012-06-01

    Recently, the discoveries of several nova candidates in M31 have been reported (ATEL #3735, #3976, and #3987), but there have been no spectroscopic confirmations. To classify these objects, we obtained narrow-band H-alpha, Sloan r', and Sloan i'-band CCD images of the central region of M31 using the 2.5-m Isaac Newton Telescope (INT) + WFC at La Palma under ~1.2" seeing on May 22.198 - 22.216 UT.

  4. Canary Island Archipelago

    NASA Technical Reports Server (NTRS)

    1989-01-01

    This nearly vertical view of the Canary Archipelago (28.5N, 16.5W) shows five of the seven islands: Grand Canary, Tenerife, Gomera, Hierro and La Palma. The largest island in view is Tenerife. Island cloud wakes evident in this photo are the result of southerly winds giving rise to cloud banks on the lee side especially on Tenerife which has the highest volcanic peaks. Island water wakes and internal waves are also evident but not as apparent.

  5. Swift J1822.3-1606: Optical spectroscopy of the counterpart candidates from the 10.4m GTC

    NASA Astrophysics Data System (ADS)

    de Ugarte Postigo, A.; Munoz-Darias, T.

    2011-07-01

    We have performed optical spectroscopy of the two objects (S1 and S2; ATEL #3496, #3502) present within the Swift/XRT error circle of the Soft Gamma-ray Repeater (SGR) candidate, Swift J1822.3-1606 (ATEL #3488, #3489, #3490, #3491, #3493, #3501, #3503). Observations were performed on July 20, 2011 using the OSIRIS spectrograph at the 10.4m Gran Telescopio de Canarias (GTC) telescope in La Palma, Spain.

  6. Recent Results from the Wide Angle Search for Planets (WASP) Prototype

    NASA Astrophysics Data System (ADS)

    Kane, S. R.; Horne, K.; Lister, T.; Collier Cameron, A.; Street, R. A.; Pollacco, D. L.; James, D.; Tsapras, Y.

    2004-12-01

    WASP0 is a prototype for what is intended to become a collection of WASPs whose primary aim is to detect transiting extra-solar planets across the face of their parent star. We present some recent results from the WASP0 camera, including observations of the known transiting planet around HD 209458. The current status of the next generation camera (SuperWASP) located on La Palma is briefly outlined.

  7. VizieR Online Data Catalog: Pre-main-sequence isochrones. II. SFR (Bell+, 2013)

    NASA Astrophysics Data System (ADS)

    Bell, C. P. M.; Naylor, T.; Mayne, N. J.; Jeffries, R. D.; Littlefair, S. P.

    2014-07-01

    The observations presented were obtained using the 2.5m Isaac Newton Telescope (INT) on La Palma at the same time as our Pleiades observations described in Paper I (Bell et al., 2012MNRAS.424.3178B, Cat. J/MNRAS/424/3178). We refer the reader to Paper I for details of our observational techniques, photometric calibration and data reduction. (29 data files).

  8. VizieR Online Data Catalog: NGC 1960 (RI)c photometric catalogue (Jeffries+, 2013)

    NASA Astrophysics Data System (ADS)

    Jeffries, R. D.; Naylor, T.; Mayne, N. J.; Bell, C. P. M.; Littlefair, S. P.

    2014-09-01

    In order to select faint, low-mass targets for subsequent spectroscopy, a photometric survey of NGC 1960 was performed using the Wide Field Camera (WFC) at the Isaac Newton Telescope (INT) on La Palma on the night of the 2004 September 28. The WFC consists of four thinned EEV 2kx4k CCDs (numbered 1-4) covering 0.33-arcsec/pix on the sky. (1 data file).

  9. VizieR Online Data Catalog: Ji light curves of WTS-2 (Birkby+, 2014)

    NASA Astrophysics Data System (ADS)

    Birkby, J. L.; Cappetta, M.; Cruz, P.; Koppenhoefer, J.; Ivanyuk, O.; Mustill, A. J.; Hodgkin, S. T.; Pinfield, D. J.; Sipocz, B.; Kovacs, G.; Saglia, R.; Pavlenko, Y.; Barrado, D.; Bayo, A.; Campbell, D.; Catalan, S.; Fossati, L.; Galvez-Ortiz, M.-C.; Kenworthy, M.; Lillo-Box, J.; Martin, E. L.; Mislis, D.; de Mooij, E. J. W.; Nefs, S. V.; Snellen, I. A. G.; Stoev, H.; Zendejas, J.; Del Burgo, C.; Barnes, J.; Goulding, N.; Haswell, C. A.; Kuznetsov, M.; Lodieu, N.; Murgas, F.; Palle, E.; Solano, E.; Steele, P.; Tata, R.

    2015-07-01

    The infrared light curves of the WTS were generated from time series photometry taken with the WFCAM imager mounted at the prime focus of UKIRT. In order to confirm the transit of WTS-2 b and to help constrain the transit model, on 2010 July 18 we obtained further time series photometry in the Sloan i band using the Wide Field Camera (WFC) on the 2.5m Isaac Newton Telescope (INT) at Roque de Los Muchachos, La Palma. (2 data files).

  10. VizieR Online Data Catalog: Hα galaxies in Abell 1367 and Coma (Iglesias-Paramo+, 2002)

    NASA Astrophysics Data System (ADS)

    Iglesias-Paramo, J.; Boselli, A.; Cortese, L.; Vilchez, J. M.; Gavazzi, G.

    2002-04-01

    We present a deep wide field Hα imaging survey of the central regions of the two nearby clusters of galaxies Coma and Abell 1367, taken with the WFC at the Prime Focus at the NT 2.5m telescope located at Observatorio de El Roque de los Muchachos (La Palma), on April 26th and 28th 2000. We determine for the first time the Schechter parameters of the Hα luminosity function (LF) of cluster galaxies. (2 data files).

  11. VizieR Online Data Catalog: High-speed photometry obs. of WD 1145+017 syst. (Gansicke+, 2016)

    NASA Astrophysics Data System (ADS)

    Gansicke, B. T.; Aungwerojwit, A.; Marsh, T. R.; Dhillon, V. S.; Sahman, D. I.; Veras, D.; Farihi, J.; Chote, P.; Ashley, R.; Arjyotha, S.; Rattanasoon, S.; Littlefair, S. P.; Pollacco, D.; Burleigh, M. R.

    2016-05-01

    We obtained high-speed photometry with the frame-transfer camera ULTRASPEC mounted on the 2.4m Thai National Telescope (TNT) on Doi Inthanon over eleven nights in between 2015, November 28, and December 22. Additional observations were obtained on 2015, December 17, 23-25, using the Warwick 1m (W1m) telescope at the Roque de Los Muchachos Observatory on La Palma. (1 data file).

  12. Quantum channels with correlated noise and entanglement teleportation

    SciTech Connect

    Yeo Ye

    2003-05-01

    Motivated by the results of Macchiavello and Palma on entanglement-enhanced information transmission over a quantum channel with correlated noise, we demonstrate how the entanglement teleportation scheme of Lee and Kim gives rise to two uncorrelated generalized depolarizing channels. In an attempt to find a teleportation scheme that yields two correlated generalized depolarizing channels, we discover a teleportation scheme that allows one to learn about the entanglement in an entangled pure input state, without decreasing the amount of entanglement associated with it.

  13. Manufacturing of FRODOSpec red arm optics and mounts

    NASA Astrophysics Data System (ADS)

    Carrasco, E.; Langarica, R.; Páez, G.; Pérez, C.; Aguayo, F.; Reyes, J.

    2007-06-01

    The fibrefed robotic dual-beam optical spectrograph FRODOSpec is one of the main instruments built for use at the Liverpool 2-m robotic telescope located in La Palma. INAOE was the successful tender of the contract for the manufacturing of the red arm optics and lens mounts. The project was developed jointly by INAOE, CIO and IAUNAM. We describe the project main characteristics and the obtained results.

  14. VizieR Online Data Catalog: UU Cnc UBVRI differential photometry (Kalv+, 2007)

    NASA Astrophysics Data System (ADS)

    Kalv, P.; Oja, T.; Harvig, V.

    2010-02-01

    UU Cancri was observed with the Tallinn 50-cm telescope (BV from 1972, UBVR from 1980), the Kvistaberg 40-cm telescope (UBV from 1985), the 60-cm telescope of the Royal Swedish Academy of Sciences at Observatorio Astrofisico del Roque de los Muchachos, La Palma Canary Islands (UBV from 1991) and 2.5-m Nordic Optical Telescope (UBVRI on seven nights from 1990). Up to 1994 in total 234 observations (one normal point per night) have been obtained. (2 data files).

  15. First Avalanche-photodiode camera test (FACT): A novel camera using G-APDs for the observation of very high-energy γ-rays with Cherenkov telescopes

    NASA Astrophysics Data System (ADS)

    Braun, I.; Commichau, S. C.; Rissi, M.; Backes, M.; Biland, A.; Bretz, T.; Britvitch, I.; Commichau, V.; von Gunten, H.; Hildebrand, D.; Horisberger, U.; Kranich, D.; Lorenz, E.; Lustermann, W.; Mannheim, K.; Neise, D.; Pauss, F.; Pohl, M.; Renker, D.; Rhode, W.; Röser, U.; Straumann, U.; Viertel, G.

    2009-10-01

    We present a project for a novel camera using Geiger-mode Avalanche Photodiodes (G-APDs), to be installed in a small telescope (former HEGRA CT3) on the MAGIC site in La Palma (Canary Island, Spain). This novel type of semiconductor photon detector provides several superior features compared to conventional photomultiplier tubes (PMTs). The most promising one is a much higher Photon Detection Efficiency.

  16. Immunomodulatory and Antimicrobial Activity of Babassu Mesocarp Improves the Survival in Lethal Sepsis

    PubMed Central

    Prado, Dayanna S.; Barcellos, Priscila S.; Gonçalves, Azizedite G.

    2016-01-01

    Attalea speciosa syn Orbignya phalerata Mart. (babassu) has been used in the treatment of inflammatory and infectious diseases. Aim of the study. To investigate the antimicrobial and immunological activity of babassu mesocarp extract (EE). Material and Methods. The in vitro antimicrobial activity was evaluated by disk diffusion assay and by determination of the minimum inhibitory concentration (MIC) to Escherichia coli, Pseudomonas aeruginosa, Enterococcus faecalis, Staphylococcus aureus, and methicillin-resistant Staphylococcus aureus (MRSA). The flavonoids and phenolic acids content were determined by chromatography. The in vivo assays were performed in Swiss mice submitted to sepsis by cecal ligation and puncture (CLP). The mice received EE subcutaneously (125 or 250 mg/Kg), 6 hours after the CLP. The number of lymphoid cells was quantified and the cytokines production was determined by ELISA after 12 h. Results. EE was effective as antimicrobial to E. faecalis, S. aureus, and MRSA. EE is rich in phenolic acids, a class of compounds with antimicrobial and immunological activity. An increased survival can be observed in those groups, possibly due to a significant inhibition of TNF-α and IL-6. Conclusions. The EE showed specific antimicrobial activity in vitro and an important antiseptic effect in vivo possibly due to the antimicrobial and immunomodulatory activity.

  17. Correlation between populations of Rhodnius and presence of palm trees as risk factors for the emergence of Chagas disease in Amazon region, Brazil.

    PubMed

    Ricardo-Silva, Alice Helena; Lopes, Catarina M; Ramos, Leandro B; Marques, William A; Mello, Cícero B; Duarte, Rosemere; de la Fuente, Ana Laura Carbajal; Toma, Helena K; Reboredo-Oliveira, Luciana; Kikuchi, Simone A; Baptista, Thaiana F; Santos-Mallet, Jacenir R; Junqueira, Angela Cristina V; Gonçalves, Teresa Cristina M

    2012-09-01

    Among the states that comprise the legally defined Amazon region of Brazil, Pará has presented the highest occurrences of acute cases of Chagas disease over the last two decades. These cases have been attributed to consumption of fruits from native palm trees. In surveys in rural and wild areas of the municipality of Oriximiná, Pará, triatomine fauna, their main ecotopes and the infection rate due to Trypanosoma cruzi were identified using active and passive search methods: manual capture and Noireau traps, respectively. A total of 582 ecotopes were surveyed using 1496 Noireau traps. Out of 442 specimens collected, 289 were identified as Rhodnius robustus and 153 as Rhodnius pictipes. The infection rate caused by T. cruzi was 17.4%. The food sources of the triatomines were found to be birds, hemolymph, horses, and rodents. The association between R. robustus and inajá palm trees (Attalea marita), which are abundant in rural areas, was confirmed. On the other hand, R. pictipes is found in several palm tree species, such as inajá (A. marita), mucajá (Acrocomia aculeata), murumuru (Astrocaryum murumuru) and patauá (Oenocarpus bataua), and in bromeliads in wild areas. These occurrences of triatomine species in regions with or without T. cruzi infection, in the vicinity of the main settlement of the municipality, suggest that there is a need for entomological and epidemiological surveillance in this region.

  18. Responses of squirrel monkeys to seasonal changes in food availability in an eastern Amazonian forest.

    PubMed

    Stone, Anita I

    2007-02-01

    Tropical forests are characterized by marked temporal and spatial variation in productivity, and many primates face foraging problems associated with seasonal shifts in fruit availability. In this study, I examined seasonal changes in diet and foraging behaviors of two groups of squirrel monkeys (Saimiri sciureus), studied for 12 months in Eastern Brazilian Amazonia, an area characterized by seasonal rainfall. Squirrel monkeys were primarily insectivorous (79% of feeding and foraging time), with fruit consumption highest during the rainy season. Although monkeys fed from 68 plant species, fruit of Attalea maripa palms accounted for 28% of annual fruit-feeding records. Dietary shifts in the dry season were correlated with a decline in ripe A. maripa fruits. Despite pronounced seasonal variation in rainfall and fruit abundance, foraging efficiency, travel time, and distance traveled remained stable between seasons. Instead, squirrel monkeys at this Eastern Amazonian site primarily dealt with the seasonal decline in fruit by showing dietary flexibility. Consumption of insects, flowers, and exudates increased during the dry season. In particular, their foraging behavior at this time strongly resembled that of tamarins (Saguinus sp.) and consisted of heavy use of seed-pod exudates and specialized foraging on large-bodied orthopterans near the forest floor. Comparisons with squirrel monkeys at other locations indicate that, across their geographic range, Saimiri use a variety of behavioral tactics during reduced periods of fruit availability. PMID:17154390

  19. Immunomodulatory and Antimicrobial Activity of Babassu Mesocarp Improves the Survival in Lethal Sepsis

    PubMed Central

    Prado, Dayanna S.; Barcellos, Priscila S.; Gonçalves, Azizedite G.

    2016-01-01

    Attalea speciosa syn Orbignya phalerata Mart. (babassu) has been used in the treatment of inflammatory and infectious diseases. Aim of the study. To investigate the antimicrobial and immunological activity of babassu mesocarp extract (EE). Material and Methods. The in vitro antimicrobial activity was evaluated by disk diffusion assay and by determination of the minimum inhibitory concentration (MIC) to Escherichia coli, Pseudomonas aeruginosa, Enterococcus faecalis, Staphylococcus aureus, and methicillin-resistant Staphylococcus aureus (MRSA). The flavonoids and phenolic acids content were determined by chromatography. The in vivo assays were performed in Swiss mice submitted to sepsis by cecal ligation and puncture (CLP). The mice received EE subcutaneously (125 or 250 mg/Kg), 6 hours after the CLP. The number of lymphoid cells was quantified and the cytokines production was determined by ELISA after 12 h. Results. EE was effective as antimicrobial to E. faecalis, S. aureus, and MRSA. EE is rich in phenolic acids, a class of compounds with antimicrobial and immunological activity. An increased survival can be observed in those groups, possibly due to a significant inhibition of TNF-α and IL-6. Conclusions. The EE showed specific antimicrobial activity in vitro and an important antiseptic effect in vivo possibly due to the antimicrobial and immunomodulatory activity. PMID:27630733

  20. Immunomodulatory and Antimicrobial Activity of Babassu Mesocarp Improves the Survival in Lethal Sepsis.

    PubMed

    Barroqueiro, Elizabeth S B; Prado, Dayanna S; Barcellos, Priscila S; Silva, Tonicley A; Pereira, Wanderson S; Silva, Lucilene A; Maciel, Márcia C G; Barroqueiro, Rodrigo B; Nascimento, Flávia R F; Gonçalves, Azizedite G; Guerra, Rosane N M

    2016-01-01

    Attalea speciosa syn Orbignya phalerata Mart. (babassu) has been used in the treatment of inflammatory and infectious diseases. Aim of the study. To investigate the antimicrobial and immunological activity of babassu mesocarp extract (EE). Material and Methods. The in vitro antimicrobial activity was evaluated by disk diffusion assay and by determination of the minimum inhibitory concentration (MIC) to Escherichia coli, Pseudomonas aeruginosa, Enterococcus faecalis, Staphylococcus aureus, and methicillin-resistant Staphylococcus aureus (MRSA). The flavonoids and phenolic acids content were determined by chromatography. The in vivo assays were performed in Swiss mice submitted to sepsis by cecal ligation and puncture (CLP). The mice received EE subcutaneously (125 or 250 mg/Kg), 6 hours after the CLP. The number of lymphoid cells was quantified and the cytokines production was determined by ELISA after 12 h. Results. EE was effective as antimicrobial to E. faecalis, S. aureus, and MRSA. EE is rich in phenolic acids, a class of compounds with antimicrobial and immunological activity. An increased survival can be observed in those groups, possibly due to a significant inhibition of TNF-α and IL-6. Conclusions. The EE showed specific antimicrobial activity in vitro and an important antiseptic effect in vivo possibly due to the antimicrobial and immunomodulatory activity. PMID:27630733

  1. Association of anthropogenic land use change and increased abundance of the Chagas disease vector Rhodnius pallescens in a rural landscape of Panama.

    PubMed

    Gottdenker, Nicole L; Calzada, José E; Saldaña, Azäel; Carroll, C Ronald

    2011-01-01

    Anthropogenic disturbance is associated with increased vector-borne infectious disease transmission in wildlife, domestic animals, and humans. The objective of this study was to evaluate how disturbance of a tropical forest landscape impacts abundance of the triatomine bug Rhodnius pallescens, a vector of Chagas disease, in the region of the Panama Canal in Panama. Rhodnius pallescens was collected (n = 1,186) from its primary habitat, the palm Attalea butyracea, in five habitat types reflecting a gradient of anthropogenic disturbance. There was a high proportion of palms infested with R. pallescens across all habitat types (range = 77.1-91.4%). Results show that disturbed habitats are associated with increased vector abundance compared with relatively undisturbed habitats. Bugs collected in disturbed sites, although in higher abundance, tended to be in poor body condition compared with bugs captured in protected forest sites. Abundance data suggests that forest remnants may be sources for R. pallescens populations within highly disturbed areas of the landscape. PMID:21212205

  2. Risk factors associated with Trypanosoma cruzi exposure in domestic dogs from a rural community in Panama

    PubMed Central

    Saldaña, Azael; Calzada, José E; Pineda, Vanessa; Perea, Milixa; Rigg, Chystrie; González, Kadir; Santamaria, Ana Maria; Gottdenker, Nicole L; Chaves, Luis F

    2015-01-01

    Chagas disease, caused by Trypanosoma cruzi infection, is a zoonosis of humans, wild and domestic mammals, including dogs. In Panama, the main T. cruzi vector is hodnius pallescens, a triatomine bug whose main natural habitat is the royal palm, Attalea butyracea. In this paper, we present results from three T. cruzi serological tests (immunochromatographic dipstick, indirect immunofluorescence and ELISA) performed in 51 dogs from 24 houses in Trinidad de Las Minas, western Panama. We found that nine dogs were seropositive (17.6% prevalence). Dogs were 1.6 times more likely to become T. cruzi seropositive with each year of age and 11.6 times if royal palms where present in the peridomiciliary area of the dog's household or its two nearest neighbours. Mouse-baited-adhesive traps were employed to evaluate 12 peridomestic royal palms. All palms were found infested with R. pallescens with an average of 25.50 triatomines captured per palm. Of 35 adult bugs analysed, 88.6% showed protozoa flagellates in their intestinal contents. In addition, dogs were five times more likely to be infected by the presence of an additional domestic animal species in the dog's peridomiciliary environment. Our results suggest that interventions focused on royal palms might reduce the exposure to T. cruzi infection. PMID:26560985

  3. Could the Chagas disease elimination programme in Venezuela be compromised by reinvasion of houses by sylvatic Rhodnius prolixus bug populations?

    PubMed

    Sanchez-Martin, Maria J; Feliciangeli, M Dora; Campbell-Lendrum, Diarmid; Davies, Clive R

    2006-10-01

    The Andean Pact Initiative (1997) committed Andean countries to eliminate vectorial transmission of Chagas disease by 2010 via widespread residual insecticide spraying. In Venezuela, this aim could be compromised by reinvasion of houses by palm tree populations of the major vector Rhodnius prolixus. To test this hypothesis, a multivariate logistic regression was undertaken of risk factors for triatomine infestation and colonization in 552 houses and 1068 peri-domestic outbuildings in Barinas State. After adjusting for other risk factors, including palm roofs, R. prolixus infestation and colonization of outbuildings (and, to some extent, houses) was significantly associated with proximity to high densities of Attalea butyracea palm trees. House infestation and/or colonization was also positively associated with bug density in peri-domestic outbuildings, the presence of pigsties and nests. Hence, R. prolixus populations in ineffectively sprayed outbuildings could also provide an important source of house re-infestations. The secondary vector Triatoma maculata was mainly found associated with the presence of hens nesting both indoors and outdoors.

  4. Human Trypanosomiasis in the Eastern Plains of Colombia: New Transmission Scenario.

    PubMed

    Angulo-Silva, Victor Manuel; Castellanos-Domínguez, Yeny Zulay; Flórez-Martínez, Mónica; Esteban-Adarme, Lyda; Pérez-Mancipe, William; Farfán-García, Ana Elvira; Luna-Marín, Katherine Paola

    2016-02-01

    Characteristics of Trypanosoma cruzi infection were studied in a rural area of the eastern plains of Colombia. Using enzyme-linked immunosorbent assay and indirect fluorescent-antibody tests, the infection was determined in 11.6% of the inhabitants of 142 dwellings. During 6 months of community surveillance, in 42.3% dwellings, 609 triatomines were collected (597 Rhodnius prolixus and seven, three, one, and one of Panstrongylus geniculatus, Psammolestes arturi, Eratyrus mucronatus, and Triatoma maculata, respectively). Rhodnius prolixus was found in 80% peridomiciliary Attalea butyracea palms examined with baited traps, and its infection with T. cruzi was 30% and 38.5% in dwellings and palms, respectively. Trypanosoma cruzi was isolated in five of 35 triatomines and in one of 24 dogs. The blood of domestic and wild animals was identified in triatomines collected in the intradomicile and in palms. These results support the extension of the wild cycle of T. cruzi to human dwellings and the characterization of a new scenario for transmission in Colombia.

  5. New scenarios of Trypanosoma cruzi transmission in the Orinoco region of Colombia.

    PubMed

    Rendón, Lina María; Guhl, Felipe; Cordovez, Juan Manuel; Erazo, Diana

    2015-05-01

    Rhodnius prolixus, a blood-sucking triatomine with domiciliary anthropophilic habits, is the main vector of Chagas disease. The current paradigm of Trypanosoma cruzi transmission in Columbia includes a sylvatic and domiciliary cycle co-existing with domestic and sylvatic populations of reservoirs. The aim of this study is to evaluate the population densities and relative abundance of triatomines and mammals that may be involved in the sylvatic cycle of Chagas disease to clarify the epidemiological scenario in an endemic area in the province of Casanare. Insect vectors on Attalea butyracea palms were captured using both manual searches and bait traps. The capture of mammals was performed using Sherman and Tomahawk traps. We report an infestation index of 88.5% in 148 palms and an index of T. cruzi natural infection of 60.2% in 269 dissected insects and 11.9% in 160 captured mammals. High population densities of triatomines were observed in the sylvatic environment and there was a high relative abundance of reservoirs in the area, suggesting a stable enzootic cycle. We found no evidence of insect domiciliation. Taken together, these observations suggest that eco-epidemiological factors shape the transmission dynamics of T. cruzi, creating diverse scenarios of disease transmission.

  6. Association of Anthropogenic Land Use Change and Increased Abundance of the Chagas Disease Vector Rhodnius pallescens in a Rural Landscape of Panama

    PubMed Central

    Gottdenker, Nicole L.; Calzada, José E.; Saldaña, Azäel; Carroll, C. Ronald

    2011-01-01

    Anthropogenic disturbance is associated with increased vector-borne infectious disease transmission in wildlife, domestic animals, and humans. The objective of this study was to evaluate how disturbance of a tropical forest landscape impacts abundance of the triatomine bug Rhodnius pallescens, a vector of Chagas disease, in the region of the Panama Canal in Panama. Rhodnius pallescens was collected (n = 1,186) from its primary habitat, the palm Attalea butyracea, in five habitat types reflecting a gradient of anthropogenic disturbance. There was a high proportion of palms infested with R. pallescens across all habitat types (range = 77.1–91.4%). Results show that disturbed habitats are associated with increased vector abundance compared with relatively undisturbed habitats. Bugs collected in disturbed sites, although in higher abundance, tended to be in poor body condition compared with bugs captured in protected forest sites. Abundance data suggests that forest remnants may be sources for R. pallescens populations within highly disturbed areas of the landscape. PMID:21212205

  7. Tri-trophic interactions affect density dependence of seed fate in a tropical forest palm.

    PubMed

    Visser, Marco D; Muller-Landau, Helene C; Wright, S Joseph; Rutten, Gemma; Jansen, Patrick A

    2011-11-01

    Natural enemies, especially host-specific enemies, are hypothesised to facilitate the coexistence of plant species by disproportionately inflicting more damage at increasing host abundance. However, few studies have assessed such Janzen-Connell mechanisms on a scale relevant for coexistence and no study has evaluated potential top-down influences on the specialized pests. We quantified seed predation by specialist invertebrates and generalist vertebrates, as well as larval predation on these invertebrates, for the Neotropical palm Attalea butyracea across ten 4-ha plots spanning 20-fold variation in palm density. As palm density increased, seed attack by bruchid beetles increased, whereas seed predation by rodents held constant. But because rodent predation on bruchid larvae increased disproportionately with increasing palm density, bruchid emergence rates and total seed predation by rodents and bruchids combined were both density-independent. Our results demonstrate that top-down effects can limit the potential of host-specific insects to induce negative-density dependence in plant populations.

  8. Risk factors associated with Trypanosoma cruzi exposure in domestic dogs from a rural community in Panama.

    PubMed

    Saldaña, Azael; Calzada, José E; Pineda, Vanessa; Perea, Milixa; Rigg, Chystrie; González, Kadir; Santamaria, Ana Maria; Gottdenker, Nicole L; Chaves, Luis F

    2015-11-01

    Chagas disease, caused by Trypanosoma cruzi infection, is a zoonosis of humans, wild and domestic mammals, including dogs. In Panama, the main T. cruzi vector is Rhodnius pallescens, a triatomine bug whose main natural habitat is the royal palm, Attalea butyracea. In this paper, we present results from three T. cruzi serological tests (immunochromatographic dipstick, indirect immunofluorescence and ELISA) performed in 51 dogs from 24 houses in Trinidad de Las Minas, western Panama. We found that nine dogs were seropositive (17.6% prevalence). Dogs were 1.6 times more likely to become T. cruzi seropositive with each year of age and 11.6 times if royal palms where present in the peridomiciliary area of the dog's household or its two nearest neighbours. Mouse-baited-adhesive traps were employed to evaluate 12 peridomestic royal palms. All palms were found infested with R. pallescens with an average of 25.50 triatomines captured per palm. Of 35 adult bugs analysed, 88.6% showed protozoa flagellates in their intestinal contents. In addition, dogs were five times more likely to be infected by the presence of an additional domestic animal species in the dog's peridomiciliary environment. Our results suggest that interventions focused on royal palms might reduce the exposure to T. cruzi infection.

  9. New scenarios of Trypanosoma cruzi transmission in the Orinoco region of Colombia

    PubMed Central

    Rendón, Lina María; Guhl, Felipe; Cordovez, Juan Manuel; Erazo, Diana

    2015-01-01

    Rhodnius prolixus, a blood-sucking triatomine with domiciliary anthropophilic habits, is the main vector of Chagas disease. The current paradigm of Trypanosoma cruzi transmission in Columbia includes a sylvatic and domiciliary cycle co-existing with domestic and sylvatic populations of reservoirs. The aim of this study is to evaluate the population densities and relative abundance of triatomines and mammals that may be involved in the sylvatic cycle of Chagas disease to clarify the epidemiological scenario in an endemic area in the province of Casanare. Insect vectors on Attalea butyracea palms were captured using both manual searches and bait traps. The capture of mammals was performed using Sherman and Tomahawk traps. We report an infestation index of 88.5% in 148 palms and an index of T. cruzi natural infection of 60.2% in 269 dissected insects and 11.9% in 160 captured mammals. High population densities of triatomines were observed in the sylvatic environment and there was a high relative abundance of reservoirs in the area, suggesting a stable enzootic cycle. We found no evidence of insect domiciliation. Taken together, these observations suggest that eco-epidemiological factors shape the transmission dynamics of T. cruzi, creating diverse scenarios of disease transmission. PMID:25830543

  10. VizieR Online Data Catalog: Circumstellar debris discs (Maldonado+, 2015)

    NASA Astrophysics Data System (ADS)

    Maldonado, J.; Eiroa, C.; Villaver, E.; Montesinos, B.; Mora, A.

    2015-09-01

    The high-resolution spectra used in this work come from several spectrographs and telescopes and have already been used in some of our previous works (Maldonado et al., 2010, Cat. J/A+A/521/A12, 2012, Cat. J/A+A/541/A40, 2013, Cat. J/A+A/554/A84; Martinez-Arnaiz et al., 2010, Cat. J/A+A/520/A79), which can be consulted for details concerning the observing runs and the reduction procedure. Summarising, the data were taken with the following instruments: i) FOCES at the 2.2-m telescope of the Calar Alto observatory (CAHA, Almeria, Spain); ii) SARG at the Telescopio Nazionale Galileo (TNG, 3.58m), La Palma (Canary Islands, Spain); iii) FIES at the Nordic Optical Telescope (NOT, 2.56m), La Palma; and iv) HERMES at the Mercator telescope (1.2m), also in La Palma. We used additional spectra from the public library "S4N" (Allende Prieto et al., 2004, Cat. J/A+A/420/183), which contains spectra taken with the 2d coude spectrograph at McDonald Observatory and the FEROS instrument at the ESO 1.52m telescope in La Silla; from the ESO/ST-ECF Science Archive Facility (http://archive.eso.org/cms/); and from the pipeline processed FEROS and HARPS data archive (http://archive.eso.org/wdb/wdb/eso/repro/form). (2 data files).

  11. Characteristics of Mesospheric Gravity Waves Observed in the Central Region of Brazil

    NASA Astrophysics Data System (ADS)

    Wrasse, Cristiano Max; Messias Almeida, Lazaro; Abalde Guede, Jose Ricardo; Valentin Bageston, José; Pillat, Valdir G.; Lima, Washington L. C.

    Gravity waves observations were carried out at Palmas (10.16o S, 48.26o W) Brazil, between September 2007 and December 2008, using an all-sky airglow imager to measure the OH emis-sion. The gravity waves were divided in two groups following they morphology as band and ripples type waves. The main characteristics of the band type waves are: horizontal wavelength between 10-35 km; observed period raging from 5 to 25 minutes; observed phase speed between 5-60 m/s. Preferential propagation directions of the bands are northward and southward, show-ing a clear anisotropy. For the ripples the main wave parameters are: horizontal wavelength ranging between 5 and 15 km; observed period mainly distributed between 5 and 15 minutes and horizontal phase velocity from 5 to 30 m/s. The ripples showed the same anisotropy as in the preferential propagation direction as the band type waves. The gravity wave characteristics observed at Palmas were compared with other observations carried out in Brazil, showing simi-lar features. In order to explain the seasonal variation of the wave propagation direction, maps of Outgoing Longwave Radiation (ORL) were used to locate regions with intense deep con-vection (OLR < 220 W.m-2 ) in the lower atmosphere. During summer and autumn the wave sources regions are well correlated with deep convection areas located at west and northwest of Palmas.

  12. Field evaluation of traditionally used plant-based insect repellents and fumigants against the malaria vector Anopheles darlingi in Riberalta, Bolivian Amazon.

    PubMed

    Moore, Sarah J; Hill, Nigel; Ruiz, Carmen; Cameron, Mary M

    2007-07-01

    Inexpensive insect repellents may be needed to supplement the use of impregnated bed-nets in the Amazon region, where the primary malaria vector, Anopheles darlingi (Root), is exophilic and feeds in the early evening. Three plants that are traditionally used to repel mosquitoes in Riberalta, Bolivian Amazon, were identified by focus group, and then they were tested against An. darlingi as well as Mansonia indubitans (Dyar & Shannon)/Mansonia titillans (Walker). Cymbopogon citratus (Staph), Guatemalan lemongrass, essential oil at 25% was used as a skin repellent, and it provided 74% protection for 2.5 h against predominantly An. darlingi and 95% protection for 2.5 h against Mansonia spp. Attalea princeps (name not verified) husks, burned on charcoal in the traditional way provided 35 and 51% protection against An. darlingi and Mansonia spp., respectively. Kerosene lamps, often used to light rural homes, were used as a heat source to volatilize 100% Mentha arvensis (Malinv ex. Bailey) essential oil, and they reduced biting by 41% inside traditional homes against Mansonia spp., although they were ineffective outdoors against An. darlingi. All three plant-based repellents provided significant protection compared with controls. Plant-based repellents, although less effective than synthetic alternatives, were shown by focus groups to be more culturally acceptable in this setting, in particular para-menthane-3, 8, idol derived from lemon eucalyptus, Corymbia citriodora (Hook). Plant-based repellents have the potential to be produced locally and therefore sold more cheaply than synthetic commercial repellents. Importantly, their low cost may encourage user compliance among indigenous and marginalized populations. PMID:17695017

  13. Restriction limits and main drivers of fruit production in palm in central Amazonia

    NASA Astrophysics Data System (ADS)

    Freitas, Cintia; Costa, Flávia R. C.; Barbosa, Carlos Eduardo; Cintra, Renato

    2016-11-01

    Adult plants incapable of producing viable offspring inflate our perception of the size of population distribution. We propose that species occurrence is limited to a subset of the environmental gradient and that it changes as ontogenetic development progresses. Moreover, fruit production is associated with site-specific environmental conditions. We sampled 2988 adult individuals from nine palm species in 30 plots (40 × 250 m) and used a larger data set including 42 other plots distributed along a continuous topo-edaphic gradient in a terra firme forest near Manaus, Brazil. Five out of nine palm species were more restricted to a sub-section of the topo-edaphic gradient in the adult-size phase. More specifically, reproductive individuals of species Attalea attaleoides and A. microcarpa had even more restricted distributions than adult-sized, non-reproductive plants. Successive environmental filtering and competition probably acting through selective mortality led to increasing habitat restriction, with reproductive adults being restricted to a smaller part of the region than juveniles and adults. Water availability and nutrients limited both the ability to produce fruits and the amount of fruit production. Previous studies have reported stronger habitat associations for older plants than for seedlings or juveniles, but we show here that some species are more restricted at their reproductive stage. Plant specializations to local conditions may be more common than currently acknowledged, and a significant portion of individuals in a population might represent sinks. Such strong environmental limitations of reproductive plants should also be considered in management of species with economic value and in conservation planning.

  14. Modeling Disease Vector Occurrence when Detection Is Imperfect: Infestation of Amazonian Palm Trees by Triatomine Bugs at Three Spatial Scales

    PubMed Central

    Abad-Franch, Fernando; Ferraz, Gonçalo; Campos, Ciro; Palomeque, Francisco S.; Grijalva, Mario J.; Aguilar, H. Marcelo; Miles, Michael A.

    2010-01-01

    Background Failure to detect a disease agent or vector where it actually occurs constitutes a serious drawback in epidemiology. In the pervasive situation where no sampling technique is perfect, the explicit analytical treatment of detection failure becomes a key step in the estimation of epidemiological parameters. We illustrate this approach with a study of Attalea palm tree infestation by Rhodnius spp. (Triatominae), the most important vectors of Chagas disease (CD) in northern South America. Methodology/Principal Findings The probability of detecting triatomines in infested palms is estimated by repeatedly sampling each palm. This knowledge is used to derive an unbiased estimate of the biologically relevant probability of palm infestation. We combine maximum-likelihood analysis and information-theoretic model selection to test the relationships between environmental covariates and infestation of 298 Amazonian palm trees over three spatial scales: region within Amazonia, landscape, and individual palm. Palm infestation estimates are high (40–60%) across regions, and well above the observed infestation rate (24%). Detection probability is higher (∼0.55 on average) in the richest-soil region than elsewhere (∼0.08). Infestation estimates are similar in forest and rural areas, but lower in urban landscapes. Finally, individual palm covariates (accumulated organic matter and stem height) explain most of infestation rate variation. Conclusions/Significance Individual palm attributes appear as key drivers of infestation, suggesting that CD surveillance must incorporate local-scale knowledge and that peridomestic palm tree management might help lower transmission risk. Vector populations are probably denser in rich-soil sub-regions, where CD prevalence tends to be higher; this suggests a target for research on broad-scale risk mapping. Landscape-scale effects indicate that palm triatomine populations can endure deforestation in rural areas, but become rarer in

  15. Star formation enhancement characteristics in interacting galaxies

    NASA Astrophysics Data System (ADS)

    Zaragoza-Cardiel, J.; Beckman, J. E.; Font, J.; Camps-Fariña, A.; García-Lorenzo, B.; Erroz-Ferrer, S.

    2015-02-01

    We have observed 12 interacting galaxies using the Fabry-Perot interferometer GHαFaS (Galaxy Hα Fabry-Perot system) on the 4.2m William Herschel Telescope (La Palma). We have extracted the physical properties (sizes, Hα luminosity and velocity dispersion) of 236 HII regions for the full sample of interacting galaxies. We have derived the physical properties of 664 HII regions for a sample of 28 isolated galaxies observed with the same instrument in order to compare both populations of HII regions, finding that there are brighter and denser star forming regions in the interacting galaxies compared with the isolated galaxies sample.

  16. Spectral classification of ASASSN-16fo (AT 2016cob) as Type Ia SN

    NASA Astrophysics Data System (ADS)

    Piascik, A. S.; Steele, I. A.

    2016-05-01

    We conducted a spectroscopic observation of transient ASASSN-16fo (AT 2016cob) at 2016-05-29T23:40:07 UT. This transient was reported in ATel #9081 as observed by the All Sky Automated Survey for SuperNovae (ASAS-SN) on 2016-05-21.31 UT at position RA = 13:32:35.812, DEC = -05:16:21.33 A spectrum was obtained in the visible, 400-800nm, with resolution R~350, using the SPRAT spectrograph on the Liverpool Telescope located at Roque de los Muchachos, La Palma.

  17. VizieR Online Data Catalog: MC2: SFR in CIZA J2242.8+5301 (Sobral+, 2015)

    NASA Astrophysics Data System (ADS)

    Sobral, D.; Stroe, A.; Dawson, W. A.; Wittman, D.; Jee, M. J.; Rottgering, H.; van Weeren, R. J.; Bruggen, M.

    2015-11-01

    We conducted a spectroscopic survey of the Sausage cluster with the DEIMOS on the Keck II 10-m telescope over two observing runs on 2013 July 14 and 2013 September 5. For full details on the observations and data reduction, see Dawson et al. (2015, Cat. J/ApJ/805/143). We followed up 103 candidate line emitters from Stroe et al. (2015MNRAS.450..646S) using AF2 on the WHT in La Palma on two nights during 2014 July 2-3. (1 data file).

  18. Discovery of Three Apparent Novae in M81

    NASA Astrophysics Data System (ADS)

    Hornoch, K.; Vaduvescu, O.; Oers, P. van

    2013-02-01

    We report the discovery of three apparent novae in the M81 galaxy on a co-added 3200-s narrow-band H-alpha CCD image taken with the 2.5-m Isaac Newton Telescope (INT) + WFC at La Palma in ~1.4" seeing on Feb. 25.132 UT. The new objects are visible on individual 400-s frames and well visible on the co-added image (see the finding chart linked below), but are not present on numerous narrow-band H-alpha archival images from the INT down to limiting magnitude as faint as H-alpha = 22.5.

  19. Discovery of Three Probable Novae in M81

    NASA Astrophysics Data System (ADS)

    Hornoch, K.; Ramanjooloo, Y.

    2014-01-01

    We report the discovery of three probable novae in the M81 galaxy on co-added 1600-s narrow-band H-alpha CCD images taken with the 2.5-m Isaac Newton Telescope (INT) + WFC at La Palma under ~1.1" and ~1.5" seeing on 2014 Jan. 3.228 and 4.082 UT, respectively. The new objects are well visible on the co-added images (see the finding chart linked below), but are not present on numerous narrow-band H-alpha archival images from the INT down to limiting magnitude as faint as H-alpha = 22.3.

  20. Optical re-brightening of the black hole binary XTE J1859+226

    NASA Astrophysics Data System (ADS)

    Corral-Santana, J. M.; Rodríguez-Gil, P.; Hurley, D.; Casares, J.

    2010-09-01

    Observations of the black hole binary XTE J1859+226 revealed an unexpected optical re-brightening. Images were taken with the Nordic Optical Telescope (NOT) using ALFOSC on Jul 13-14, the William Herschel Telescope (WHT) with ACAM on Aug 8 and the Isaac Newton Telescope (INT) with WFC on Aug 19 at the Observatorio del Roque de los Muchachos, La Palma, Spain. The target is found ~1 magnitude brighter than its quiescence level of R=22.48 +- 0.07 as reported in Zurita et al.

  1. Discovery of Eleven Optical Nova Candidates in M81

    NASA Astrophysics Data System (ADS)

    Hornoch, K.; Sipocz, B.

    2012-01-01

    We report the discovery of five nova candidates in M81 found on a co-added 1100-s narrow-band H-alpha CCD image taken on 2012 Jan. 9.102 UT with the 2.54-m Isaac Newton Telescope (INT) at La Palma. The new objects are visible on the single frames used for the co-added image, but are not present on numerous narrow-band H-alpha archival images from the INT down to limiting magnitude as faint as H-alpha = 22.3.

  2. Discovery of Two Novae in M81

    NASA Astrophysics Data System (ADS)

    Hornoch, K.; Vaduvescu, O.; Zurita, C.; Patrick, L.; Ledo, H.; Karjalainen, R.

    2012-05-01

    We report the discovery of two novae in M81 on a co-added 1600-s narrow-band H-alpha CCD image taken with the 2.5-m Isaac Newton Telescope (INT) + WFC at La Palma under ~0.8" seeing on May 22.901 UT. The new objects are well visible on the co-added image (see the finding chart linked below) as well as on individual 400-s frames, but are not present on numerous narrow-band H-alpha archival images from the INT down to limiting magnitude as faint as H-alpha = 22.3.

  3. Discovery of Two Probable Novae in M81

    NASA Astrophysics Data System (ADS)

    Hornoch, K.; Patrick, L.; Arnold, D.; Dominguez, L.; Fernandez, A. Gonzalez; Hardy, L.; Hrudkova, M.; Van Oers, P.; Ramanjooloo, Y.; Karjalainen, R.; Vaduvescu, O.

    2012-10-01

    We report the discovery of two probable novae in the M81 galaxy on a co-added 1600-s narrow-band H-alpha CCD image taken with the 2.5-m Isaac Newton Telescope (INT) + WFC at La Palma on Sep. 28.233 UT. The new objects are well visible on the co-added image (see the finding chart linked below) and faintly visible on individual 400-s frames, but are not present on numerous narrow-band H-alpha archival images from the INT down to limiting magnitude as faint as H-alpha = 22.3.

  4. Discovery of Two Apparent Novae in M81 and H-alpha Confirmation of PNV J09554276+6904230

    NASA Astrophysics Data System (ADS)

    Hornoch, K.; Tudor, V.; Vaduvescu, O.

    2014-02-01

    We report the discovery of two apparent novae in M81 on a co-added 1600-s narrow-band H-alpha CCD image taken with the 2.5-m Isaac Newton Telescope (INT) + WFC at La Palma under ~1.3" seeing on 2014 Feb. 21.018 UT. The new objects are well visible on the co-added image (see the finding charts linked below), but are not present on numerous narrow-band H-alpha archival images from the INT down to limiting magnitude as faint as H-alpha = 22.3.

  5. Discovery of Two Apparent Novae in M81

    NASA Astrophysics Data System (ADS)

    Hornoch, K.; McCormac, J.; Vaduvescu, O.

    2013-06-01

    We report the discovery of two apparent novae in the M81 galaxy on a co-added 1600-s, narrow-band H-alpha CCD image taken with the 2.5-m Isaac Newton Telescope (INT) + WFC at La Palma in ~1.5" seeing on 2013 June 3.905 UT. The new objects are visible on individual 400-s frames and well visible on the co-added image (see the finding chart linked below), but are not present on numerous narrow-band H-alpha archival images from the INT down to a limiting magnitude as faint as H-alpha = 22.7.

  6. Discovery of Five Probable Novae in M81

    NASA Astrophysics Data System (ADS)

    Hornoch, K.; Vaduvescu, O.; Dominguez, L.; McCormac, J.; Mocnik, T.; Ramanjooloo, Y.; Fusillo, N. Gentile; Doostmohammadi, S.

    2013-10-01

    We report the discovery of five probable novae in M81 on co-added 1600-s narrow-band H-alpha CCD images taken with the 2.5-m Isaac Newton Telescope (INT) + WFC at La Palma under ~1.6" and ~1.4" seeing on 2013 Oct. 15.175 UT and 16.219 UT, respectively. The new objects are well visible on the co-added images (see the finding chart linked below), but are not present on numerous narrow-band H-alpha archival images from the INT down to limiting magnitude as faint as H-alpha = 22.3.

  7. Spectroscopic observations of the counterpart of IGR J00291+5934

    NASA Astrophysics Data System (ADS)

    Roelofs, G.; Jonker, P. G.; Steeghs, D.; Torres, M.; Nelemans, G.

    2004-12-01

    Spectroscopic observations of the optical counterpart of the millisecond X-ray pulsar IGR J00291+5934 (Atel #352, 353) reported in an Atel by Fox & Kulkarni were obtained (Dec 5 00:29-01:15 UT) with the ISIS spectrograph mounted on the 4.2m William Herschel Telescope on La Palma. Weather conditions were not optimal with a seeing of ~2" and thin clouds. The spectra show weak evidence for broad emission line features near the HeII line at 4686 Angstrom and near the Halpha line at 6563 Angstrom.

  8. A Dynamical Model for the cD Galaxy NGC 6086

    NASA Astrophysics Data System (ADS)

    De Rijcke, S.; Dejonghe, H.; Carter, D.; Bridges, T. J.; Hau, G. K. T.

    We present a dynamical model for the cD galaxy NGC6086 in the Abell 2162 cluster. Deep long-slit major axis spectra of NGC6086, NGC6166 and NGC6173 were obtained on the INT in La Palma by D. Carter, T. Bridges and G. Hau in order to probe the halo dynamics and metallicity gradients out to at least 1.5 Re. The dynamical model was fitted directly to the spectra using a modeling technique developed at the University of Gent. This approach makes parameterization of the LOSVDs unnecessary and allows the use of a mix of several template stars to avoid template mismatch.

  9. Commissioning Instrument for the GTC

    NASA Astrophysics Data System (ADS)

    Cuevas, S.; Sánchez, B.; Bringas, V.; Espejo, C.; Flores, R.; Chapa, O.; Lara, G.; Chavolla, A.; Anguiano, G.; Arciniega, S.; Dorantes, A.; González, J. L.; Montoya, J. M.; Toral, R.; Hernández, H.; Nava, R.; Devaney, N.; Castro, J.; Cavaller-Marqués, L.

    2005-12-01

    During the GTC integration phase, the Commissioning Instrument (CI) will be a diagnostic tool for performance verification. The CI features four operation modes: imaging, pupil imaging, Curvature WFS, and high resolution Shack-Hartmann WFS. This instrument was built by the Instituto de Astronomía UNAM and the Centro de Ingeniería y Desarrollo Industrial (CIDESI) under GRANTECAN contract after a public bid. In this paper we made a general instrument overview and we show some of the performance final results obtained when the Factory Acceptance tests previous to its transport to La Palma.

  10. VizieR Online Data Catalog: K2-19b light curve (Armstrong+, 2015)

    NASA Astrophysics Data System (ADS)

    Armstrong, D. J.; Santerne, A.; Veras, D.; Barros, S. C. C.; Demangeon, O.; Lillo-Box, J.; McCormac, J.; Osborn, H. P.; Tsantaki, M.; Almenara, J.-M.; Barrado, D.; Boisse, I.; Bonomo, A. S.; Brown, D. J. A.; Bruno, G.; Rey Cerda, J.; Courcol, B.; Deleuil, M.; Diaz, R. F.; Doyle, A. P.; Hebrard, G.; Kirk, J.; Lam, K. W. F.; Pollacco, D. L.; Rajpurohit, A.; Spake, J.; Walker, S. R.

    2015-08-01

    The Near Infrared Transiting ExoplanetS (NITES) Telescope is a semi-robotic 0.4m (f/10) Meade LX200GPS Schmidt-Cassegrain telescope installed at the ORM, La Palma. One transit of K2-19b was observed on 2015 Feb 28. The telescope was defocused slightly to 3.3 FWHM and 814 images of 20s exposure time were obtained with 5s dead time between each. Observations were obtained without a filter. The table presents data taken with the NITES telescope shown in Figure 1 of the publication. (1 data file).

  11. Impact of turbulence in long range quantum and classical communications.

    PubMed

    Capraro, Ivan; Tomaello, Andrea; Dall'Arche, Alberto; Gerlin, Francesca; Ursin, Ruper; Vallone, Giuseppe; Villoresi, Paolo

    2012-11-16

    The study of the free-space distribution of quantum correlations is necessary for any future application of quantum and classical communication aiming to connect two remote locations. Here we study the propagation of a coherent laser beam over 143 km (between Tenerife and La Palma Islands of the Canary archipelagos). By attenuating the beam we also studied the propagation at the single photon level. We investigated the statistic of arrival of the incoming photons and the scintillation of the beam. From the analysis of the data, we propose the exploitation of turbulence to improve the signal to noise ratio of the signal.

  12. The Travelogue of an Astronomer

    NASA Astrophysics Data System (ADS)

    Hameed, S.

    2005-03-01

    Roughly 3 million years back, a series of volcanic eruptions raised a huge mass of land to a height of over 3000 meters. The primary volcano lost its fight to gravity and eventually collapsed 500,000 years ago to form a huge caldera. Today this is the most dominant feature on the island of La Palma in the Spanish Canary Islands, located in the Atlantic Ocean off the coast of Morocco. The rim of the caldera is now populated with instruments designed to answer some of humanity's most profound questions about our place in the universe. Three million years of landscaping has provided astronomers an ideal place to gaze at the heavens.

  13. Discovery of an Apparent Nova in M81

    NASA Astrophysics Data System (ADS)

    Hornoch, K.; Vaduvescu, O.; Gonzalez, A.

    2013-04-01

    We report the discovery of an apparent nova in the M81 galaxy on a co-added 2000-s narrow-band H-alpha CCD image taken with the 2.5-m Isaac Newton Telescope (INT) + WFC at La Palma in ~1.4" seeing on Apr. 5.946 UT. The new object is visible on individual 400-s frames and well visible on the co-added image (see the finding chart linked below), but is not present on numerous narrow-band H-alpha archival images from the INT down to limiting magnitude as faint as H-alpha = 21.7.

  14. H-alpha Confirmation, Astrometry and Photometry of Two Novae in M31

    NASA Astrophysics Data System (ADS)

    Hornoch, K.; Vaduvescu, O.; Gonzalez, A.

    2013-06-01

    We obtained five 120-s narrow-band H-alpha and three 90-s R-band CCD frames of the central region of M31 on 2013 June 27.189 and 27.193 UT, respectively, with the 2.5-m Isaac Newton Telescope + WFC at La Palma under ~2.0" seeing. The single frames were co-added and the co-added images were used for photometry and astrometry of the two recently discovered and spectroscopically unconfirmed M31 nova candidates, namely the PNV J00424894+4115163 (ATel #5133) and PNV J00425987+4120379 (ATel #5157).

  15. Estudio de Evolución de los Núcleos Activos de Galaxias y QSOs: II. Búsqueda de Supernovas en Galaxias Pr'oximas con AGNs y Starburst

    NASA Astrophysics Data System (ADS)

    Merlo, D.; Lípari, S.; Moyano, M.

    Several lines of observational evidences suggesting that supernovae and hypernovae events play a main role in evolution of galaxies, AGNs and QSOs. In order to search more detailed information, we have started a study and detection of supernovae and hypernovae in the nuclei of nearby active galaxies obtaining high-resolution spectra and images in the standard UBVRI filters mainly from CASLEO, Bosque Alegre and data from archive of HST, ESO and La Palma observatories. In this paper we present the first preliminary results obtained in this program. FULL TEXT IN SPANISH

  16. VizieR Online Data Catalog: Ji photometry of WTS 19g-4-02069 (Nefs+, 2013)

    NASA Astrophysics Data System (ADS)

    Nefs, S. V.; Birkby, J. L.; Snellen, I. A. G.; Hodgkin, S. T.; Sipocz, B. M.; Kovacs, G.; Mislis, D.; Pinfield, D. J.; Martin, E. L.

    2014-06-01

    The WFCAM Transit Survey (WTS), in operation since 2007 August on the UKIRT Wide Field Camera (WFCAM), is awarded 200 nights of observing time on UKIRT. We obtain follow-up photometric observations in the Sloan i band on the 2.5m Isaac Newton Telescope (INT) on La Palma, using the Wide Field Camera (WFC), to refine our best-fitting light-curve solution from the WFCAM J-band survey data. The observations are part of a wider WTS follow-up campaign to confirm planetary transit candidates, between 2010 July 18 and August 01, leaving a few windows to observe binary eclipses. (2 data files).

  17. VizieR Online Data Catalog: ubvy photometry of NGC2419 (Frank+, 2015)

    NASA Astrophysics Data System (ADS)

    Frank, M. J.; Koch, A.; Feltzing, S.; Kacharov, N.; Wilkinson, M. I.; Irwin, M.

    2015-07-01

    Imaging of NGC 2419 in the intermediate-band Stromgren filters u, b, v and y was obtained in February 2012 using the Wide Field Camera (WFC) at the 2.5m Isaac Newton Telescope (INT) at the Roque de los Muchachos Observatory, La Palma, Spain. The resulting photometric catalog containing 1197 detections in the unvignetted field of the camera, passing basic quality cuts (magnitude uncertainty, sharpness, {chi}) in all four filters is made available here. It covers NGC 2419 out to about 25 arcmin, several times beyond its tidal radius, but is incomplete in the cluster centre due to crowding. (1 data file).

  18. Discovery of Five Probable Novae in M81

    NASA Astrophysics Data System (ADS)

    Hornoch, K.; Errmann, R.; Sowicka, P.; Humphries, N.; Vaduvescu, O.

    2015-10-01

    We report the discovery of five probable novae in M81 on a co-added 2000-s narrow-band H-alpha CCD image taken with the 2.5-m Isaac Newton Telescope (INT) + WFC at La Palma under ~1.5" seeing on 2015 Oct. 14.198 UT. The new objects are well visible on the co-added image (see the finding charts linked below), but are not present on numerous narrow-band H-alpha archival images from the INT down to limiting magnitude as faint as H-alpha = 22.3.

  19. VizieR Online Data Catalog: BUDHIES I. redshifts and EW[OII] (Jaffe+, 2013)

    NASA Astrophysics Data System (ADS)

    Jaffe, Y. L.; Poggianti, B. M.; Verheijen, M. A. W.; Deshev, B. Z.; van Gorkom, J. H.

    2014-06-01

    To design the spectroscopic observations, we made use of the B- and R-band magnitudes, the astrometry, and the galaxy-star separation from the INT (Isaac Newton Telescopes) photometry, as well as the HI detection information and the available redshifts. Our selection and prioritization criteria are summarized in the following. The spectroscopic observations were made using the AutoFib2+WYFFOS (AF2) wide-field, multifibre spectrograph mounted on the 4.2m William Herschel Telescope (WHT) in La Palma. (1 data file).

  20. Optical Photometry of the flaring gamma-ray blazar AO 0235+164

    NASA Astrophysics Data System (ADS)

    Pursimo, Tapio; Losada, Illa R.; Messa, Matteo; Gafton, Emanuel; Ojha, Roopesh

    2016-03-01

    We report optical photometry of the blazar AO 0235+164 obtained with the 2.56m Nordic Optical Telescope in La Palma to look for any enhanced optical activity associated with a recent flare in the daily averaged gamma-ray flux seen in the public lightcurve of the Fermi/LAT instrument: http://fermi.gsfc.nasa.gov/FTP/glast/data/lat/catalogs/asp/current/lightcurves/0235+164_86400.png Fermi/LAT first reported a detection of gamma-ray activity from this source in Sep, 2008 (ATel#1744) and a short timescale flare in Oct 14, 2008 (ATel#1784).

  1. VizieR Online Data Catalog: Spectroscopic survey of Kepler stars. I. (Niemczura+, 2015)

    NASA Astrophysics Data System (ADS)

    Niemczura, E.; Murphy, S. J.; Smalley, B.; Uytterhoeven, K.; Pigulski, A.; Lehmann, H.; Bowman, D. M.; Catanzaro, G.; van Aarle, E.; Bloemen, S.; Briquet, M.; De Cat, P.; Drobek, D.; Eyer, L.; Gameiro, J. F. S.; Gorlova, N.; Kaminski, K.; Lampens, P.; Marcos-Arenal, P.; Papics, P. I.; Vandenbussche, B.; van Winckel, H.; Steslicki, M.; Fagas, M.

    2015-11-01

    In this paper we analyse high-resolution spectra taken with the cross-dispersed, fibre-fed echelle spectrograph HERMES (High Efficiency and Resolution Mercator Echelle Spectrograph) attached to the 1.2-m Mercator Telescope located on La Palma (Canary Islands, Spain). The spectra have a resolving power R~85000 and cover the spectral range from 3770 to 9000Å. The typical signal-to-noise (S/N) ratio for an individual spectrum at 5500Å is 80-100. (4 data files).

  2. Gravity wave observations using an all-sky imager network

    NASA Astrophysics Data System (ADS)

    Wrasse, Cristiano Max; Almeida, Lazaro M.; Abalde Guede, Jose Ricardo; Fagundes, Paulo Roberto; Nicoli Candido, Claudia Maria; Alves Bolzan, Maurício José; Guarnieri, Fernando; Messias Almeida, Lazaro

    Gravity waves in the mesosphere were observed by airglow all-sky imager network of the UNI- VAP at São José dos Campos (23o S, 45o W), Braśpolis (22o S, 45o W) and Palmas (10o S, 48o W), a e o Brazil. Gravity wave characteristics like morphology, horizontal wavelength, period, phase speed and propagation direction will be analysed and discussed. The results will be compared with other observation sites in Brazil. Wave directionality will also be discussed in terms of wave sources and wind filtering.

  3. Data compression for the first G-APD Cherenkov Telescope

    NASA Astrophysics Data System (ADS)

    Ahnen, M. L.; Balbo, M.; Bergmann, M.; Biland, A.; Bretz, T.; Buß, J.; Dorner, D.; Einecke, S.; Freiwald, J.; Hempfling, C.; Hildebrand, D.; Hughes, G.; Lustermann, W.; Lyard, E.; Mannheim, K.; Meier, K.; Mueller, S.; Neise, D.; Neronov, A.; Overkemping, A.-K.; Paravac, A.; Pauss, F.; Rhode, W.; Steinbring, T.; Temme, F.; Thaele, J.; Toscano, S.; Vogler, P.; Walter, R.; Wilbert, A.

    2015-09-01

    The FACT telescope on the Canaries island of La Palma is the first Imaging Atmospheric Cherenkov Telescope (IACT) to use solid state photomultipliers. It generates up to 2 TB of data per night which motivated us to investigate how to reduce the volume of data. Reducing the throughput enables us to efficiently acquire, store and process the observations data. This document presents the conclusions of this work, along with the implementation of the custom compression algorithm and I/O layer that is currently in use to operate the telescope.

  4. VizieR Online Data Catalog: Star clusters in M33 (Beasley+, 2015)

    NASA Astrophysics Data System (ADS)

    Beasley, M. A.; San, Roman I.; Gallart, G.; Sarajedini, A.; Aparicio, A.

    2015-08-01

    Basic and derived data for M33 cluster sample. This is the full table 2 corresponding to the abbreviated one in the online journal article. Previously confirmed candidates (identified by radial velocities or high-resolution imaging) were observed using OSIRIS on the GTC in long-slit mode during semesters 2010B-2012A. Previously identified star clusters and star cluster candidates identified by San Roman et al. (2010ApJ...720.1674S, Cat. J/ApJ/720/1674) were observed using the WYFFOS/AF2 multifibre instrument on the WHT in La Palma. (1 data file).

  5. Gaia16aso, Gaia16asq, Gaia16asu and Gaia16atb candidate supernovae near galaxies confirmed by Mercator/Maia imaging

    NASA Astrophysics Data System (ADS)

    Blanco-Cuaresma, S.; Roelens, M.; Semaan, T.; Palaversa, L.; Mowlavi, N.; Eyer, L.

    2016-07-01

    We report confirmation of Gaia Science Alerts transients Gaia16aso, Gaia16asq, Gaia16asu and Gaia16atb. Images were obtained in G and R bands of the Maia instrument mounted to the Flemish 1.2m Mercator telescope at Roque de los Muchachos observatory, La Palma, Canary Islands, Spain, on 2016 July 04 - 05. These new sources are supernovae candidates near galaxies and they are not visible in archival 2MASS and DSS images: Gaia16aso, Gaia16asq, Gaia16asu and Gaia16atb.

  6. Gaia16asc, Gaia16ase, Gaia16asj and Gaia16ask candidate supernovae near galaxies confirmed by Mercator/Maia imaging

    NASA Astrophysics Data System (ADS)

    Blanco-Cuaresma, S.; Semaan, T.; Roelens, M.; Palaversa, L.; Mowlavi, N.; Eyer, L.

    2016-07-01

    We report confirmation of Gaia Science Alerts transients Gaia16asc, Gaia16ase, Gaia16asj and Gaia16ask. Images were obtained in G and R bands of the Maia instrument mounted to the Flemish 1.2m Mercator telescope at Roque de los Muchachos observatory, La Palma, Canary Islands, Spain, on 2016 July 02 - 04. These new sources are supernovae candidates near galaxies and they are not visible in archival 2MASS and DSS images: Gaia16asc, Gaia16ase, Gaia16asj and Gaia16ask.

  7. The Hard X-Ray and Coordinated Multifrequency Properties of the Blazar 3C279

    NASA Technical Reports Server (NTRS)

    Collmar, W.; Boettcher, Markus

    2004-01-01

    Upon our successful AO-1 proposal no. 120085, the quasar 3C 279 has been observed in a coordinated multiwavelength campaign, including INTEGRAL, Chandra, and ground-based radio, near-infrared, and optical observations in June 2003. INTEGRAL observed 3C279 continuously for 300 ksec in INTEGRAL AO-1 between June 1 and June 5,2003. In addition, a Chandra pointing of 5 ksec was done on June 2, the Metsiihovi radio telescope contributed high-frequency radio observations, the SEST observed the source at mm wavelengths, and the 80 cm Turola telescope at La Palma and the 2.3 m telescope at Siding Springs, Australia contributed optical observations.

  8. VizieR Online Data Catalog: Spectra of IPHAS symbiotic stars (Rodriguez-Flores+, 2014)

    NASA Astrophysics Data System (ADS)

    Rodriguez-Flores, E. R.; Corradi, R. L. M.; Mampaso, A.; Garcia-Alvarez, D.; Munari, U.; Greimel, R.; Rubio-Diez, M. M.; Santander-Garcia, M.

    2014-04-01

    We obtained spectra for 18 candidate symbiotic stars in May, June, and December 2012 at the 10.4m Gran Telescopio Canarias (GTC) at the Observatorio del Roque de los Muchachos (La Palma, Spain). The OSIRIS instrument was used in its long-slit mode. The combination of grism R1000B and a slit width of 1" provides a spectral dispersion of 2.1Å per (binned x2) pixel, a resolution of 7Å, and a spectral coverage from 3650 to 7850Å. Exposure times ranged between 100s and 800s, depending of the magnitude of each object. (2 data files).

  9. Swedish Solar Telescope - Short summary of instrumentation and observation techniques

    NASA Astrophysics Data System (ADS)

    Scharmer, Goran; Lofdahl, Mats

    A short summary of the design concepts of the Swedish Solar Telescope at La Palma is given along with the most important parts of the instrumentation and observing techniques. The experience from using high-speed read-out CCDs for solar observations is also discussed. The advantages of this data acquisition system are that it allows real-time frame selection for achieving high spatial resolution, that several cameras can be slaved by one seeing monitor, and that bursts of digital images can be recorded for full spatial coverage of small parts of active regions.

  10. MAIA, a three-channel imager for asteroseismology: instrument design

    NASA Astrophysics Data System (ADS)

    Raskin, Gert; Bloemen, Steven; Morren, Johan; Perez Padilla, Jesus; Prins, Saskia; Pessemier, Wim; Vandersteen, Jeroen; Merges, Florian; Østensen, Roy; Van Winckel, Hans; Aerts, Conny

    2013-11-01

    MAIA, an acronym for Mercator Advanced Imager for Asteroseismology, is a three-channel instrument that targets fast-cadence three-colour photometry, installed at the 1.2-m Mercator telescope at the Roque de los Muchachos at La Palma (Canary Islands, Spain). This instrument observes a 9.4 × 14.1 arcmin2 field-of-view simultaneously in three wavelength bands on three large frame-transfer CCDs. These detectors were developed for ESA's cancelled Eddington space mission and were offered on permanent loan to the Institute of Astronomy (KU Leuven, Belgium). MAIA uses its own ugr photometric system that is a crude approximation of the SDSS system. The instrument is designed to perform multi-colour observations for asteroseismology, with specific emphasis on subdwarf and white dwarf single and binary stars. We describe the design of the instrument, discuss key components, and report on its performance and first results. Based on observations made with the Mercator Telescope, operated on the island of La Palma by the Flemish Community, at the Spanish Observatorio del Roque de los Muchachos of the Instituto de Astrofísica de Canarias.

  11. Introduction of non-native marine fish species to the Canary Islands waters through oil platforms as vectors

    NASA Astrophysics Data System (ADS)

    Pajuelo, José G.; González, José A.; Triay-Portella, Raül; Martín, José A.; Ruiz-Díaz, Raquel; Lorenzo, José M.; Luque, Ángel

    2016-11-01

    This work documents the introduction of non-native fish species to the Canary Islands (central-eastern Atlantic) through oil rigs. Methodological approaches have included surveys by underwater visual censuses around and under oil platforms and along the docking area of rigs at the Port of Las Palmas. Eleven non-native fish species were registered. Paranthias furcifer, Abudefduf hoefleri, Acanthurus bahianus, Acanthurus chirurgus, and Acanthurus coeruleus are first recorded from the Canaries herein. Other three species could not be identified, although they have never been observed in the Canaries. Cephalopholis taeniops, Abudefduf saxatilis, and Acanthurus monroviae had been previously recorded. Native areas of these species coincide with the areas of origin and the scale of oil rigs with destination the Port of Las Palmas. The absence of native species in the censuses at rigs and their presence at rigs docking area, together with the observation of non-native species after the departure of platforms, reject the possibility that these non-native species were already present in the area introduced by another vector. C. taeniops, A. hoefleri, A. saxatilis, A. chirurgus, A. coeruleus and A. monroviae are clearly seafarer species. A. bahianus seems to be a potential seafarer species. P. furcifer is a castaway species. For the moment, the number of individuals of the non-native species in marine ecosystems of the Canaries seems to be low, and more investigation is needed for controlling these translocations.

  12. Measurements of the beam-wave fluctuations over a 142 km atmospheric path

    NASA Astrophysics Data System (ADS)

    Perlot, N.; Giggenbach, D.; Henniger, H.; Horwath, J.; Knapek, M.; Zettl, K.

    2006-08-01

    An optical link has been established between the Canary Islands La Palma and Tenerife. A 1064-nm transmitting laser was located on La Palma whereas a BPSK communication receiver and measurement instruments were installed in ESA's OGS on Tenerife. Beside the demonstration of a high-data-rate coherent signal transmission, the goal of the experiment was to measure the effects of the atmosphere on the beam propagation in order to estimate its impact on optical links. In particular, wavefront distortions have been investigated by means of a DIMM instrument and scintillation was observed by imaging the pupil of the OGS telescope on a CCD camera. Strong scintillation was observed during all the experiment with scintillation peaks at sunsets and sunrises, and saturation at about noon. Because of the narrowness of the beam (15-μrad divergence), beam wander has been a serious issue. Statistical results are compared with theory. Recommendations regarding the specifications of optical coherent systems in such detrimental conditions are given.

  13. An eight-dimensional quantum mechanical Hamiltonian for X + YCZ3 system and its applications to H + CH4 reaction

    NASA Astrophysics Data System (ADS)

    Liu, Rui; Xiong, Hongwei; Yang, Minghui

    2012-11-01

    An eight-dimensional quantum mechanical Hamiltonian has been proposed based on Palma and Clary's model in which the non-reacting CZ3 group keeps a C3v symmetry in the X + YCZ3 ↔ XY + CZ3 reaction J. Palma and D. C. Clary [J. Chem. Phys. 112, 1859 (2000), 10.1063/1.480749]. By transforming the original Cartesian coordinate system (x, s) into a scaled polar coordinate system (q, γ), the vibrational Hamiltonian of CZ3 group is expressed in a simple form with a clear physical picture. This Hamiltonian is used to investigate the H + CH4 → H2 + CH3 reaction on the Jordan-Gilbert potential energy surface. The total reaction probabilities are calculated for the initial ground state, and umbrella, bending, symmetric, and asymmetric stretching excited states of CH4 with total angular momentum J = 0. The integral cross sections for the reaction are also studied for these initial vibrational states with a centrifugal-sudden approximation. The total integral cross sections for the asymmetric stretching vibrational excited state are in good agreement with the experimental observations. The results also showed the difference of dynamical behavior between reactions from symmetric and asymmetric stretching excited states. The thermal rate constants are calculated for the temperature range T = 250-2000 K and compared with the experimental and other theoretical results.

  14. Star-forming galaxies in low-redshift clusters: comparison of integrated properties of cluster and field galaxies

    NASA Astrophysics Data System (ADS)

    Bretherton, C. F.; James, P. A.; Moss, C.; Whittle, M.

    2010-12-01

    Aims: We investigate the effect of the cluster environment on the star formation properties of galaxies in 8 nearby Abell clusters. Methods: Star formation properties are determined for individual galaxies using the equivalent width of Hα+[Nii] line emission from narrow-band imaging. Equivalent width distributions are derived for each galaxy type in each of 3 environments - cluster, supercluster (outside the cluster virial radius) and field. The effects of morphological disturbance on star formation are also investigated. Results: We identify a population of early-type disk galaxies in the cluster population with enhanced star formation compared to their field counterparts. The enhanced cluster galaxies frequently show evidence of disturbance, and the disturbed galaxies show marginal evidence for a higher velocity dispersion, possibly indicative of an infalling population. Based on observations made with the Nordic Optical Telescope, operated on the island of La Palma jointly by Denmark, Finland, Iceland, Norway, and Sweden, in the Spanish Observatorio del Roque de los Muchachos of the Instituto de Astrofísica de Canarias; and with the Jacobus Kapteyn Telescope, which was operated on the island of La Palma by the Isaac Newton Group in the Spanish Observatorio del Roque de los Muchachos of the Instituto de Astrofísica de Canarias.

  15. Impacts of fishing and environmental factors driving changes on littoral fish assemblages in a subtropical oceanic island

    NASA Astrophysics Data System (ADS)

    Sangil, Carlos; Martín-García, Laura; Hernández, José Carlos; Concepción, Laura; Fernández, Raúl; Clemente, Sabrina

    2013-08-01

    The structure of demersal fish assemblages of commercial interest was studied at 51 sites on La Palma Island (Canary Islands, northeastern Atlantic). On this island, demersal fish populations are limited and independent from other islands. As deep water separates the islands and the shallow sublittoral platforms are not continuous, adult inter-island migrations are not possible except between the islands of Lanzarote and Fuerteventura. Otherwise, each island functions as a closed system, and the status of an island fish assemblage depends on local environmental conditions and activities performed in situ by the islanders. These circumstances provide a unique opportunity to test the intrainsular variability of fish assemblages. With this background, environmental parameters, fishing pressure and distance to the MPA were considered to identify the main factors explaining the spatial variation of fish assemblages off La Palma Island. Twenty-six fish species were recorded, but 60% of the total fish biomass was represented by only five species (Sparisoma cretense, Pomadasys incisus, Canthidermis sufflamen, Diplodus cervinus cervinus and Bodianus scrofa). However, the structure of assemblages was heterogeneous in response to different variables and showed substantial spatial variation. The assemblages were strongly modified by the presence of upright seaweed cover, fishing activities, and certain environmental variables. Differences were more pronounced in species that occupied the higher trophic levels. The most disturbed assemblages were those located in areas with lower upright seaweed cover and with higher fishing pressure, whereas the best-preserved assemblages corresponded to sites with controlled fishing activities, located within the MPA.

  16. The ING Studentship, INT Support, and Research Programme

    NASA Astrophysics Data System (ADS)

    Vaduvescu, O.; Dominguez Palmero, L.; Benn, C.

    2014-07-01

    For more than a decade, the ING studentship programme has offered European astronomy students an opportunity to train as observers on a medium-sized ground-based optical telescope, namely the renowned 2.5-m Isaac Newton Telescope (INT) run by the Isaac Newton Group (ING, a UK-SP-NL institution) on the beautiful Spanish island of La Palma in the Canary Islands! Practical training of the European students and hopefully future astronomers is essential in the era of very large telescopes and their queue-scheduled observing, which limits direct access to the observatories by young astronomers. Each year, the ING therefore offers 4--5 talented astronomy students the opportunity to spend one year working as support astronomers at the INT (setting up the instruments, helping visiting observers, and observing few INT discretionary nights) and working with ING staff on technical and science projects. High above the clouds at 2400 m, on the edge of the gorgeous Caldera de Taburiente of La Palma, stands the ''Roque de Los Muchachos'' Observatory (ORM) of the Instituto de Astrofísica de Canarias (IAC), part of the European Northern Observatory (ENO). Year after year, our studentship programme contributes to a better prepared future generation of astronomers. In this poster, we present some recent technical and science achievements of our past ING students, encouraging talented students to apply in the future (announced in February--March via the ING website http://www.ing.iac.es/astronomy/science/studentship.html).

  17. Polypteridae (Actinopterygii: Cladistia) and DANA-SINEs insertions.

    PubMed

    Morescalchi, Maria Alessandra; Barucca, Marco; Stingo, Vincenzo; Capriglione, Teresa

    2010-06-01

    SINE sequences are interspersed throughout virtually all eukaryotic genomes and greatly outnumber the other repetitive elements. These sequences are of increasing interest for phylogenetic studies because of their diagnostic power for establishing common ancestry among taxa, once properly characterized. We identified and characterized a peculiar family of composite tRNA-derived short interspersed SINEs, DANA-SINEs, associated with mutational activities in Danio rerio, in a group of species belonging to one of the most basal bony fish families, the Polypteridae, in order to investigate their own inner specific phylogenetic relationships. DANA sequences were identified, sequenced and then localized, by means of fluorescent in situ hybridization (FISH), in six Polypteridae species (Polypterus delhezi, P. ornatipinnis, P. palmas, P. buettikoferi P. senegalus and Erpetoichthys calabaricus) After cloning, the sequences obtained were aligned for phylogenetic analysis, comparing them with three Dipnoan lungfish species (Protopterus annectens, P. aethiopicus, Lepidosiren paradoxa), and Lethenteron reissneri (Petromyzontidae)was used as outgroup. The obtained overlapping MP, ML and NJ tree clustered together the species belonging to the two taxonomically different Osteichthyans groups: the Polypteridae, by one side, and the Protopteridae by the other, with the monotypic genus Erpetoichthys more distantly related to the Polypterus genus comprising three distinct groups: P. palmas and P. buettikoferi, P. delhezi and P. ornatipinnis and P. senegalus. In situ hybridization with DANA probes marked along the whole chromosome arms in the metaphases of all the Polypteridae species examined. PMID:21798200

  18. Development of an Online Exoplanet Course for In-Service Teachers

    NASA Astrophysics Data System (ADS)

    Barringer, Daniel; Palma, Christopher

    2016-01-01

    The Earth and Space Science Partnership (ESSP) is a collaboration among Penn State scientists, science educators and seven school districts across Pennsylvania. Penn State also offers through its fully online World Campus the opportunity for In-Service science teachers to earn an M.Ed. degree in Earth Science, and we currently offer a required online astronomy course for that program. We have previously presented descriptions of how have incorporated research-based pedagogical practices into ESSP-sponsored workshops for in-service teachers (Palma et al. 2013) and into a pilot section of introductory astronomy for non-science majors (Palma et al. 2014). In this presentation, we detail the design and development of a new online astronomy course to be offered through the M.Ed. Earth Science degree program. This course also uses a coherent content storyline approach (Roth et al. 2011), and will engage the teachers in investigations using authentic data within the Claims Evidence Reasoning framework (McNeill & Krajcik 2012). The course theme will be exploring exoplanets in order to show how these objects have forced us to reconsider some ideas in our model for the formation of the Solar System, which is a disciplinary core idea identified in the Next Generation Science Standards (citation). Course materials will be made available through Penn State's open courseware initiative and will be promoted to teachers throughout PA through the Pennsylvania Earth Science Teachers' Association (PAESTA). We gratefully acknowledge support from the NSF MSP program award DUE#0962792.

  19. The Gaia spectrophotometric standard stars survey: II. Instrumental effects of six ground-based observing campaigns

    NASA Astrophysics Data System (ADS)

    Altavilla, G.; Marinoni, S.; Pancino, E.; Galleti, S.; Ragaini, S.; Bellazzini, M.; Cocozza, G.; Bragaglia, A.; Carrasco, J. M.; Castro, A.; Di Fabrizio, L.; Federici, L.; Figueras, F.; Gebran, M.; Jordi, C.; Masana, E.; Schuster, W.; Valentini, G.; Voss, H.

    2015-08-01

    The Gaia SpectroPhotometric Standard Stars (SPSS) survey started in 2006, was awarded almost 450 observing nights and accumulated almost 100 000 raw data frames with both photometric and spectroscopic observations. Such large observational effort requires careful, homogeneous, and automatic data reduction and quality control procedures. In this paper, we quantitatively evaluate instrumental effects that might have a significant (i.e., ≥ 1 %) impact on the Gaia SPSS flux calibration. The measurements involve six different instruments, monitored over the eight years of observations dedicated to the Gaia flux standards campaigns: DOLORES@TNG in La Palma, EFOSC2@NTT and ROSS@REM in La Silla, CAFOS@2.2 m in Calar Alto, BFOSC@Cassini in Loiano, and LaRuca@1.5 m in San Pedro Mártir. We examine and quantitatively evaluate the following effects: CCD linearity and shutter times, calibration frames stability, lamp flexures, second order contamination, light polarization, and fringing. We present methods to correct for the relevant effects which can be applied to a wide range of observational projects at similar instruments. Based on data obtained with BFOSC@Cassini in Loiano, Italy; EFOSC2@NTT in La Silla, Chile; DOLORES@TNG in La Palma, Spain; CAFOS@2.2 m in Calar Alto, Spain; LaRuca@1.5 m in San Pedro Mártir, Mexico (see acknowledgements for more details).

  20. The evolution of breast cancer mortality and morbidity in Spain (1977-1988).

    PubMed

    Morales Suarez-Varela, M M; Llopis González, A; Soto Pinchel, E; Jiménez López, M C

    1996-08-01

    A study of breast cancer mortality and cancer morbidity has been carried out in Spain recently for the period 1977-1988, covering the population of the 17 Autonomous Communities and 50 provinces of the country. Data was obtained from INE, Instituto Nacional de Estadística (National Institute of Statistics), with age standardization using the indirect method. The different Autonomous Communities and provinces were compared in order to establish possible significant differences. The crude mean mortality rate was 21 cases per 100,000 inhabitants/year; Las Palmas, Gerona, Barcelona, the Balearic Islands, Navarra and Zaragoza have the highest mortality rates, with a proportional increment of 54% in that period. The crude national mean morbidity rate for the considered period was 64.0 cases per 100,000 inhabitants, and the proportional increment 180%. According to provincial figures, Alava had the highest fitted mean morbidity rate, 135 cases per 100,000 inhabitants, whilst the highest fitted mean rate was Las Palmas (28 cases/100,000 inhabitants), and the highest proportional increment was the rate for the province of Huesca (169%). When using the ANOVA test on the mean rate of the period, for mortality as well as morbidity, we observed significant differences among provinces and among Autonomous Communities (p < or = 0.05).

  1. VizieR Online Data Catalog: RGB stars in Sagittarius streams (Monaco+, 2007)

    NASA Astrophysics Data System (ADS)

    Monaco, L.; Bellazzini, M.; Bonifacio, P.; Buzzoni, A.; Ferraro, F. R.; Marconi, G.; Sbordone, L.; Zaggia, S.

    2007-04-01

    Spectra were secured using different high resolution facilities: UVES@VLT, HARPS@3.6m, and SARG@TNG. Radial velocities are obtained through cross correlation with a template spectra. Concerning chemical analysis, for the various elements, selected line equivalent widths were measured and abundances computed using the WIDTH code and ATLAS model atmospheres. A total of 13 stars were observed between August 30, 2004, and January 24, 2005, using the SARG spectrograph mounted on the Telescopio Nazionale Galileo (TNG) telescope at La Palma. We present iron (Fe) and alpha-element (Mg, Ca) abundances for 12 red giant branch stars belonging to the Sagittarius dwarf spheroidal galaxy tidal streams. Spectra were obtained with the SARG spectrograph mounted at the Telescopio Nazionale Galileo (La Palma, Spain). We used the 1.6" slit, which provides a resolution of R=29000. For each star we report the equivalent widths (EWs) measured for a selected sample of Fe, Mg, and Ca lines along with the abundances derived for each line from the measured EWs and the adopted atomic parameters. (2 data files).

  2. Structural and temporal requirements for geomagnetic field reversal deduced from lava flows.

    PubMed

    Singer, Brad S; Hoffman, Kenneth A; Coe, Robert S; Brown, Laurie L; Jicha, Brian R; Pringle, Malcolm S; Chauvin, Annick

    2005-03-31

    Reversals of the Earth's magnetic field reflect changes in the geodynamo--flow within the outer core--that generates the field. Constraining core processes or mantle properties that induce or modulate reversals requires knowing the timing and morphology of field changes that precede and accompany these reversals. But the short duration of transitional field states and fragmentary nature of even the best palaeomagnetic records make it difficult to provide a timeline for the reversal process. 40Ar/39Ar dating of lavas on Tahiti, long thought to record the primary part of the most recent 'Matuyama-Brunhes' reversal, gives an age of 795 +/- 7 kyr, indistinguishable from that of lavas in Chile and La Palma that record a transition in the Earth's magnetic field, but older than the accepted age for the reversal. Only the 'transitional' lavas on Maui and one from La Palma (dated at 776 +/- 2 kyr), agree with the astronomical age for the reversal. Here we propose that the older lavas record the onset of a geodynamo process, which only on occasion would result in polarity change. This initial instability, associated with the first of two decreases in field intensity, began approximately 18 kyr before the actual polarity switch. These data support the claim that complete reversals require a significant period for magnetic flux to escape from the solid inner core and sufficiently weaken its stabilizing effect. PMID:15800621

  3. On palms, bugs, and Chagas disease in the Americas.

    PubMed

    Abad-Franch, Fernando; Lima, Marli M; Sarquis, Otília; Gurgel-Gonçalves, Rodrigo; Sánchez-Martín, María; Calzada, José; Saldaña, Azael; Monteiro, Fernando A; Palomeque, Francisco S; Santos, Walter S; Angulo, Victor M; Esteban, Lyda; Dias, Fernando B S; Diotaiuti, Liléia; Bar, María Esther; Gottdenker, Nicole L

    2015-11-01

    Palms are ubiquitous across Neotropical landscapes, from pristine forests or savannahs to large cities. Although palms provide useful ecosystem services, they also offer suitable habitat for triatomines and for Trypanosoma cruzi mammalian hosts. Wild triatomines often invade houses by flying from nearby palms, potentially leading to new cases of human Chagas disease. Understanding and predicting triatomine-palm associations and palm infestation probabilities is important for enhancing Chagas disease prevention in areas where palm-associated vectors transmit T. cruzi. We present a comprehensive overview of palm infestation by triatomines in the Americas, combining a thorough reanalysis of our published and unpublished records with an in-depth review of the literature. We use site-occupancy modeling (SOM) to examine infestation in 3590 palms sampled with non-destructive methods, and standard statistics to describe and compare infestation in 2940 palms sampled by felling-and-dissection. Thirty-eight palm species (18 genera) have been reported to be infested by ∼39 triatomine species (10 genera) from the USA to Argentina. Overall infestation varied from 49.1-55.3% (SOM) to 62.6-66.1% (dissection), with important heterogeneities among sub-regions and particularly among palm species. Large palms with complex crowns (e.g., Attalea butyracea, Acrocomia aculeata) and some medium-crowned palms (e.g., Copernicia, Butia) are often infested; in slender, small-crowned palms (e.g., Euterpe) triatomines associate with vertebrate nests. Palm infestation tends to be higher in rural settings, but urban palms can also be infested. Most Rhodnius species are probably true palm specialists, whereas Psammolestes, Eratyrus, Cavernicola, Panstrongylus, Triatoma, Alberprosenia, and some Bolboderini seem to use palms opportunistically. Palms provide extensive habitat for enzootic T. cruzi cycles and a critical link between wild cycles and transmission to humans. Unless effective means to

  4. [Palms conservation, patterns of use and diversity (Arecaceae) in rain forests from the Chocó, Colombia].

    PubMed

    Valois-Cuesta, Hamleth; Martínez-Ruiz, Carolina; Rentería Cuesta, Yucith Yudelmis; Sol María, Panesso Hinestroza

    2013-12-01

    Arecaceae is a family rich in species and provides resources for the subsistence of human groups in the tropical regions. The aim of this work was to assess the richness, diversity, composition, and use patterns of the family Arecaceae in three communities of the Medio Atrato, Chocó, Colombia, in order to obtain useful information to support the sustainable use and conservation of this plant groups in the biogeographical area of the Colombian Chocó. The fieldwork was carried out between 2009 and 2010 in the localities of Beté, Tangui and El Buey in the municipality of Medio Atrato. In each of the communities, a total of ten plots of 80 x 5 m (400 m2; 0.4 ha per zone) were established and all individuals of palm species were counted and recorded. On the other hand, information on use types and useful organs was also recorded in each community through informal interviews. A total of 29 species and 18 genera were recorded. Bactris (24.13%) and Wettinia (10.34%) were the genera with most species richness. El Buey showed more species and genera richness (23 species, 17 genera) than Beté (15, 10) and Tangui (14, 11). The floristic similarity among the three communities was less than 45%. The species with higher use and ecological value were: Euterpe oleracea, Oenocarpus bataua, Attalea allennii, Manicaria saccifera, Bactris gassipaes and Wettinia quinaria. The categories of use with higher number of species and cultural importance were construction, food and handicraft. The most used structures of the palms were the stems and fruits. In conclusion, the results indicate that the Medio Atrato has high richness and diversity of palm species in a regional and national context. However, the relationship between number of use and ecological importance of the species depends on the locality and show that the socio-cultural significance of the palm species may vary among groups of people who share a same culture or biogeographic region. Future studies should be conducted to

  5. On palms, bugs, and Chagas disease in the Americas.

    PubMed

    Abad-Franch, Fernando; Lima, Marli M; Sarquis, Otília; Gurgel-Gonçalves, Rodrigo; Sánchez-Martín, María; Calzada, José; Saldaña, Azael; Monteiro, Fernando A; Palomeque, Francisco S; Santos, Walter S; Angulo, Victor M; Esteban, Lyda; Dias, Fernando B S; Diotaiuti, Liléia; Bar, María Esther; Gottdenker, Nicole L

    2015-11-01

    Palms are ubiquitous across Neotropical landscapes, from pristine forests or savannahs to large cities. Although palms provide useful ecosystem services, they also offer suitable habitat for triatomines and for Trypanosoma cruzi mammalian hosts. Wild triatomines often invade houses by flying from nearby palms, potentially leading to new cases of human Chagas disease. Understanding and predicting triatomine-palm associations and palm infestation probabilities is important for enhancing Chagas disease prevention in areas where palm-associated vectors transmit T. cruzi. We present a comprehensive overview of palm infestation by triatomines in the Americas, combining a thorough reanalysis of our published and unpublished records with an in-depth review of the literature. We use site-occupancy modeling (SOM) to examine infestation in 3590 palms sampled with non-destructive methods, and standard statistics to describe and compare infestation in 2940 palms sampled by felling-and-dissection. Thirty-eight palm species (18 genera) have been reported to be infested by ∼39 triatomine species (10 genera) from the USA to Argentina. Overall infestation varied from 49.1-55.3% (SOM) to 62.6-66.1% (dissection), with important heterogeneities among sub-regions and particularly among palm species. Large palms with complex crowns (e.g., Attalea butyracea, Acrocomia aculeata) and some medium-crowned palms (e.g., Copernicia, Butia) are often infested; in slender, small-crowned palms (e.g., Euterpe) triatomines associate with vertebrate nests. Palm infestation tends to be higher in rural settings, but urban palms can also be infested. Most Rhodnius species are probably true palm specialists, whereas Psammolestes, Eratyrus, Cavernicola, Panstrongylus, Triatoma, Alberprosenia, and some Bolboderini seem to use palms opportunistically. Palms provide extensive habitat for enzootic T. cruzi cycles and a critical link between wild cycles and transmission to humans. Unless effective means to

  6. A new model for the formation of linear rift zones on oceanic island volcanoes

    NASA Astrophysics Data System (ADS)

    Kluegel, A.; Walter, T. R.

    2003-04-01

    Oceanic island volcanoes commonly contain rift zones along which eruptive centers and parallel dike complexes are concentrated. Formation and orientation of rifts often remain enigmatic, however. Tectonic lineaments and regional zones of weakness facilitating magma ascent may be one reason of rift evolution, e.g. Sao Jorge (Azores) or Iceland. Alternatively, gravity tectonics of a volcano may cause formation of dike swarms oriented parallel to the line of contact between overlapping volcanic edifices (e.g. Kilauea / Mauna Loa, Hawaiian Islands). We have evidence that spreading of overlapping edifices can produce two types and orientations of dike complexes. A direction perpendicular to classic "Kilauea type" rifts is typified in the pronounced rift zones of La Palma (Canary Islands) and Madeira/Desertas islands. We suggest that these rift systems formed by edifice coalescence with a main spreading zone perpendicular to the initial line of contact between two volcanoes. Intrusions and eruptions focused along the resulting rift connecting the once separated volcanic cones, which successively grew together. Based on experimental studies we show that this mechanism works if the edifices overlap at lower (submarine) slopes and are situated both on weak substratum. By mounting analogue sand piles onto a viscous PDMS substratum, the setups represented the presumed pre-rift situations at La Palma and Madeira with small initial cones adjacent to the larger shields. Gravitative spreading of these cones produced fractures that mimic the orientation of both islands' present rift zones. The results are in agreement with the observation of an apparently old submarine cone at the southern end of the La Palma rift zone. Likewise, on Madeira, the terminal parts of the Desertas rift arm and of a recently discovered submarine rift zone off the island are both marked by a concentration of eruptive centers. Our results may also provide a clue why the rift zone of Loihi seamount (Hawaii

  7. Geology, geochronology and tectonic setting of late Cenozoic volcanism along the southwestern Gulf of Mexico: The Eastern Alkaline Province revisited

    NASA Astrophysics Data System (ADS)

    Ferrari, Luca; Tagami, Takahiro; Eguchi, Mugihiko; Orozco-Esquivel, Ma. Teresa; Petrone, Chiara M.; Jacobo-Albarrán, Jorge; López-Martínez, Margarita

    2005-09-01

    A NNW-trending belt of alkaline mafic volcanic fields parallels the Gulf of Mexico from the U.S. border southward to Veracruz state, in eastern Mexico. Previous studies grouped this volcanism into the so-called "Eastern Alkaline Province" (EAP) and suggested that it resulted from Gulf-parallel extensional faulting migrating from north to south from Oligocene to Present. On the basis of new geologic studies, forty-nine unspiked K-Ar and two 40Ar- 39Ar ages, we propose a new geodynamic model for the volcanism along the southwestern Gulf of Mexico. We studied in detail four of the six recognized fields of mafic alkaline volcanism in Veracruz state: 1) The lavas flows of Tlanchinol area (7.3-5.7 Ma), 2) the Alamo monogenetic field and Sierra de Tantima (7.6-6.6 Ma), 3) the Poza Rica and Metlatoyuca lava flows (1.6-1.3 Ma) and 4) the Chiconquiaco-Palma Sola area (6.9-3.2 Ma). Other two mafic volcanic fields may represent the continuation of alkaline volcanism to the southeast: the Middle Miocene lavas at Anegada High, offshore port of Veracruz, and the Middle to Late Miocene volcanism at the Los Tuxtlas. The existence of major Neogene extensional faults parallel to the Gulf of Mexico (i.e., ˜N-S to NNW-SSE) proposed in previous works was not confirmed by our geological studies. Elongation of volcanic necks, vent alignment, and faults mapped by subsurface data trend dominantly NE to ENE and NW to NNW. These directions are parallel to transform and normal faults that formed during the Late Jurassic opening of the Gulf of Mexico. Ascent of mafic magmas was likely facilitated and controlled by the existence of these pre-existing basement structures. Coupled with previous studies, our data demonstrate the occurrence of three magmatic episodes in Veracruz: 1) A Middle Miocene (˜15-11 Ma) episode in southern Veracruz (Palma Sola, Anegada, and Los Tuxtlas); 2) A Late Miocene to Early Pliocene (˜7.5-3 Ma) pulse of mafic alkaline volcanism throughout the study region; and 3) A

  8. Characterizing silicic rocks in the Parana Magmatic Province: an update in their origin and emplacement

    NASA Astrophysics Data System (ADS)

    Luchetti, A. F.; Nardy, A. R.; Machado, F. B.; Gravley, D. M.; Gualda, G. A.

    2013-12-01

    The Paraná Magmatic Province (PMP), a large igneous province in southern Brazil (with correlative rocks in western Africa), includes 800,000 km3 of flood basalts generated during the rifting that ultimately led to the opening of the South Atlantic and covers nearly 75% of the surface of the Paraná Basin. Towards the top of the volcanic pile, silicic rocks are observed in many areas. They comprise a small proportion of the total erupted volume (2.5%), yet correspond to a significant flare-up of silicic volcanism over a period of only a few million years. In Brazil, the silicic rocks are divided into two groups, the Chapecó Member, which appears more northerly and includes porphyritic, crystal-rich, high-Ti dacites and trachydacites; and the Palmas Member, which includes fine-grained, crystal-poor, low-Ti dacites and rhyolites. The mode of emplacement (lavas vs. pyroclastic flows) of the volcanic units has been the subject of much controversy. The aim of this project is to better understand the origin and evolution of the PMP silicic rocks. We are combining information from the regional to the thin section scale to better characterize eruption dynamics and magma distribution prior to eruption. In both Palmas and Chapecó units, we observe features consistent with emplacement in the form of pyroclastic density currents, e.g. fiamme, variable weathering patterns consistent with local variations in welding at the outcrop scale, vertical gas-escape structures, sedimentary dykes, and lythophysae. Some ignimbrite units can be traced for 10's of kilometers and with more research on their spatial distribution could reveal the location of eruptive centers. In the Palmas, ignimbrites can be observed juxtaposed against or overlying discrete eruptive centers in the form of discordant structures that resemble domes and coulees typical of lava extrusion and flow. However, many of the silicic rocks are ambiguous and difficult to characterize, with features that could be related

  9. Kinematical evidence for secular evolution in Spitzer Survey of Stellar Structure in Galaxies (S4G) spirals

    NASA Astrophysics Data System (ADS)

    Erroz-Ferrer, Santiago; Knapen, Johan H.; Font, Joan; Beckman, John E.

    2015-03-01

    We present a study of the kinematics of a sample of isolated spiral galaxies in the Spitzer Survey of Stellar Structure in Galaxies (S4G). We use Hα Fabry-Perot data from the GHαFaS instrument at the William Herschel Telescope (WHT) in La Palma, complemented with images at 3.6 microns, in the R band and in the Hα filter. The resulting data cubes and velocity field maps allow a complete study of the kinematics of a galaxy, including in-depth investigations of the rotation curve, velocity moment maps, velocity residual maps, gradient maps and position-velocity (PV) diagrams. We find clear evidence of the secular evolution processes going on in these galaxies, such as asymmetries in the velocity field in the bar zone, and non-circular motions, probably in response to the potential of the structural components of the galaxies, or to past or present interactions.

  10. Development of a versatile shuttle vector for gene expression in Geobacillus spp.

    PubMed

    Taylor, Mark P; Esteban, Carlos D; Leak, David J

    2008-07-01

    An improved, versatile shuttle vector has been created for the metabolic engineering of Geobacillus spp. As kanamycin is the most thermo-tolerant of commonly used antibiotics, the gene encoding a thermostable kanamycin nucleotidyltransferase, together with the origin of replication from the G. stearothermophilus plasmid pBST1 were cloned into the Escherichia coli cloning vector pUC18. The resulting vector, named pUCG18, replicated in both organisms and could be transformed with an efficiency of 1 x 10(4) transformants per microg of DNA in G. thermoglucosidasius and was stable up to 68 degrees C with antibiotic selection. It was used to demonstrate expression of the pyruvate decarboxylase (pdc) gene from Zymomonas palmae in G. thermoglucosidasius at 45 degrees C. Sequence analysis of the pBST1 derived origin of replication revealed homology with a family of theta replicons that have previously only been found in strains of Bacillus megaterium. PMID:18501964

  11. Taxonomic history and invasion biology of two Phyllonorycter leaf miners (Lepidoptera: Gracillariidae) with links to taxonomic and molecular datasets.

    PubMed

    De Prins, Jurate; De Prins, Willy; De Coninck, Eliane; Kawahara, Akito Y; Milton, Megan A; Hebert, Paul D N

    2013-01-01

    This paper deals with two European species, Phyllonorycter mespilella (Hübner, 1805) and P. trifasciella (Haworth, 1828), that have colonized the subtropical Canary Islands. The Rosaceae leaf miner, P. mespilella, is recorded for the first time from Lanzarote and La Palma, while the Caprifoliaceae leaf miner, P. trifasciella, is recorded from Tenerife. We present the diagnoses of these species based on morphology, a preliminary DNA barcode (COI) library of congeneric and con-familial species, and discuss the taxonomic position of the colonizers within the blancardella and trifasciella species groups. The recent intensification of anthropogenic disturbance likely accounts for their range expansion, an event that may impact the relict flora present on the Canary Islands.

  12. Near-Earth asteroids: Observer alert network and physical observations

    NASA Technical Reports Server (NTRS)

    Davis, Donald R.; Chapman, Clark R.

    1992-01-01

    This project strives to obtain physical observations on newly discovered Near-Earth Objects (NEO's) in order to provide fundamental data needed to assess the resources available in the population. The goal is acquiring data on all objects brighter than magnitude V= 17.0. To accomplish this, an electronic mail alert and observer information service that informs observers around the world as to the status of physical observations on currently observable NEO's was established. Such data is also acquired ourselves through a cooperative program with European colleagues that uses telescopes on La Palma to obtain spectra of NEO's and through observations made from a local telescope on Tumamoc Hill. This latter telescope has the advantage that large amounts of observing time are available, so that whenever a new NEO's discovered, we can be assured of getting time to observe it.

  13. Origins.

    PubMed

    Weinberg, S

    1985-10-01

    The farthest of the galaxies that can be seen through the large ground-based telescopes of modern astronomy, such as those on La Palma in the Canary Islands, are so far away that they appear as they did close to the time of the origin of the universe, perhaps some 10 billion years ago. Much has been learned, and much has still to be learned, about the young universe from optical and radio telescopes, but these instruments cannot be used to look directly at the universe in its first few hundred thousand years. Instead, they are used to search the relatively recent past for relics of much earlier times. Together with experiments planned for the next generation of elementary particle accelerators, astronomical observations should continue to extend what is known about the universe backward in time to the Big Bang and may eventually help to reveal the origins of the physical laws that govern the universe.

  14. Visits to ING

    NASA Astrophysics Data System (ADS)

    Mendez, J.

    2005-03-01

    A total of 860 visitors split in 42 tours were shown round the WHT and occasionally the INT from September 2004 to January 2005. In total 203 official tours were organised and 5656 visitors shown around in 2004, including Open Days. Visitors included the general secretary of the Swedish Royal Academy of Sciences and Ireland's embassador in Spain. The television programme `Redes' of Spanish TVE and the series `Schrodingers Katt' of the Norwegian NRK TV were filmed, and the programme series `Un Programa Estelar' comprising six chapters filmed in 2003 was shown on the Spanish TVE2 channel twice. From 8 to 14 November the Spanish Education and Science Ministry and the IAC celebrated the European Science Week on La Palma. As part of the activities, an excursion to the observatory was organised in collaboration with the Public Outreach group of OPTICON (accompanying photos).

  15. Multi-Object Spectroscopy in the Next Decade: A Conference Summary

    NASA Astrophysics Data System (ADS)

    Trager, S. C.

    2016-10-01

    I present a highly-biased summary of the conference "Multi-Object Spectroscopy in the Next Decade: Big Questions, Large Surveys, and Wide Fields," held 2-6 March 2015 in Santa Cruz de la Palma, Spain. I focus on four issues in this summary: (1) complexity in objects, physics, and instruments is driving the field of large-scale multi-object spectroscopic surveys; (2) statistics is important to drive conclusions, but inference is as or even more important; (3) multi-wavelength surveys are necessary, particularly for understanding galaxies and cosmology; and (4) a large number of new multi-object spectrographs at a wide variety of wavelengths are either already here or will rapidly be available. This conference shows that we are just learning how to get the most (astrophysics) out of these instruments.

  16. First statistics of the isopistonic angle for long baseline interferometry

    NASA Astrophysics Data System (ADS)

    Ziad, A.; Elhalkouj, T.; Petrov, R. G.; Borgnino, J.; Lazrek, M.; Benkhaldoun, Z.; Martin, F.; Elazhari, Y.

    2016-06-01

    To reach a suitable limiting magnitude with a multi-aperture interferometer, we need to cophase the different telescopes using a reference source. The latter should be located in the same isopistonic domain as the science source. We developed a direct analytical expression of deducing the isopistonic angle from atmospheric optical parameters as seeing, isoplanatic angle and outer scale. All of these atmospheric turbulence parameters are measured by the Generalized Seeing Monitor (GSM). The first statistics of the isopistonic angle obtained from the GSM data are presented and comparison between the major sites over the world are discussed (La Silla, Cerro Pachon, Paranal, San Pedro, Mt Palomar, Mauna Kea, La Palma, Oukaïmeden, Maydanak, Dome C). Implications of these isopistonic angle statistics on large interferometers cophasing in terms of sky coverage and limiting magnitude are discussed.

  17. PACT: the actuator to support the primary mirror of the ELT

    NASA Astrophysics Data System (ADS)

    Kamphues, F.; Nijenhuis, J.; den Breeje, R.; van den Dool, T. C.; Ponsioen, J.

    2008-07-01

    The European Southern Observatory (ESO) has started technology development for their next generation optical telescope. Due to its ultra large collecting area, The European Extremely Large Telescope (E-ELT) will require a paradigm shift in telescope design to keep the overall program cost at an acceptable level. The E-ELT will feature a 42 meter segmented primary mirror and will make extensive use of active and adaptive optics. Each primary mirror segment will be supported by three actuators that control piston and tilt. TNO has developed a low cost nanopositioning actuator (PACT) for the primary mirror segments. The actuators will be tested by IAC and ESO, with support from TNO, under operational conditions in a Wind Evaluation Breadboard (WEB) at the Roque de Los Muchachos observatory in La Palma.

  18. Anti-inflammatory, analgesic, and antipyretic activities of virgin coconut oil.

    PubMed

    Intahphuak, S; Khonsung, P; Panthong, A

    2010-02-01

    This study investigated some pharmacological properties of virgin coconut oil (VCO), the natural pure oil from coconut [Cocos nucifera Linn (Palmae)] milk, which was prepared without using chemical or high-heat treatment. The anti-inflammatory, analgesic, and antipyretic effects of VCO were assessed. In acute inflammatory models, VCO showed moderate anti-inflammatory effects on ethyl phenylpropiolate-induced ear edema in rats, and carrageenin- and arachidonic acid-induced paw edema. VCO exhibited an inhibitory effect on chronic inflammation by reducing the transudative weight, granuloma formation, and serum alkaline phosphatase activity. VCO also showed a moderate analgesic effect on the acetic acid-induced writhing response as well as an antipyretic effect in yeast-induced hyperthermia. The results obtained suggest anti-inflammatory, analgesic, and antipyretic properties of VCO.

  19. VizieR Online Data Catalog: Young stars in Cepheus OB3b (Littlefair+, 2010)

    NASA Astrophysics Data System (ADS)

    Littlefair, S. P.; Naylor, T.; Mayne, N. J.; Saunders, E. S.; Jeffries, R. D.

    2010-09-01

    I-band CCD images were taken with the Wide Field Camera (WFC) on the Isaac Newton Telescope (INT) on La Palma, equipped with four thinned EEV 2kx4k CCDs. A single field, with the centre of CCD No. 4 pointing at (J2000) 22:55:43.3+62:40:13 was observed, with data being taken on every night between 2004 September 21 and October 6. This data set will be referred to as the "short baseline" (SB) data set. Because the SB data set is not sensitive to periods longer than 7-10d, we augmented it with two additional data sets, both of which have longer baselines, but less dense sampling. Additional data were taken with the WFC on 29 nights between 2005 August 23 and November 1. This data set is referred to as the "long baseline 0" (LB0) data set. (3 data files).

  20. H-alpha Confirmation of Six Novae in M31

    NASA Astrophysics Data System (ADS)

    Hornoch, K.; Manilla-Robles, A.; Tudor, V.; Vaduvescu, O.; Ramsay, G.

    2013-10-01

    We obtained four 200-s narrow-band H-alpha and four 100-s Sloan r'-band CCD frames of the central region of M31 on 2013 Oct. 20.851 and 20.865 UT, respectively, with the 2.5-m Isaac Newton Telescope + WFC at La Palma under ~1.5" seeing. The single frames were co-added and the co-added images were used for photometry of 8 M31 nova candidates (see the table below). Of these, 6 have not yet been spectroscopically confirmed, namely PNV J00424239+4117190 (ATel #5475), PNV J00430954+4115399 (ATel #5468), PNV J00424654+4117006 (ATel #5450), TCP J00430048+4112366 (CBAT TOCP) , TCP J00431492+4119128 (ATel #5384, #5385), and PNV J00424974+4117303 (ATel #5265).

  1. Confirmation and Photometry of Five Optical Nova Candidates in M81

    NASA Astrophysics Data System (ADS)

    Hornoch, K.; Fohring, D.; Karjalainen, R.

    2012-01-01

    We report confirmation of five nova candidates in M81 discovered on 2012 Jan. 9.102 UT (ATEL #3871). On Jan. 21.196 UT we obtained four 400-s narrow-band H-alpha CCD frames with the 2.5-m Isaac Newton Telescope + WFC at La Palma under ~1.5" seeing. The single frames were co-added and the co-added image was used for confirmation of the nova candidates and the photometry. The candidates (except PNV J09553792+6902498, which is visible at the limit) are well visible on the co-added image as well as nova PNV J09553266+6906072 (ATEL #3735, #3770, and #3871) and PNV J09553281+6902028 (ATEL #3867).

  2. Status of MAGIC and recent results

    NASA Astrophysics Data System (ADS)

    De Angelis, A.

    2013-01-01

    Ground-based γ-ray astronomy is part of a new field of fundamental research of Astroparticle Physics, that recently made spectacular discoveries mostly thanks to Imaging Air Cherenkov Telescopes (IACT). The MAGIC telescope is a IACT located at La Palma, Canary Islands, Spain. Composed of two telescopes with 17 m diameter each, MAGIC is equipped with the largest optical reflectors in the world, and it has the lowest threshold energy (25 GeV). MAGIC started operations in 2004 in the single-detector configuration, and in 2009 as a stereo detector. Since then, it has discovered many new sources and classes of sources, both galactic and extragalactic. Here some highlights from the most recent results are presented.

  3. Anti-inflammatory, analgesic, and antipyretic activities of virgin coconut oil.

    PubMed

    Intahphuak, S; Khonsung, P; Panthong, A

    2010-02-01

    This study investigated some pharmacological properties of virgin coconut oil (VCO), the natural pure oil from coconut [Cocos nucifera Linn (Palmae)] milk, which was prepared without using chemical or high-heat treatment. The anti-inflammatory, analgesic, and antipyretic effects of VCO were assessed. In acute inflammatory models, VCO showed moderate anti-inflammatory effects on ethyl phenylpropiolate-induced ear edema in rats, and carrageenin- and arachidonic acid-induced paw edema. VCO exhibited an inhibitory effect on chronic inflammation by reducing the transudative weight, granuloma formation, and serum alkaline phosphatase activity. VCO also showed a moderate analgesic effect on the acetic acid-induced writhing response as well as an antipyretic effect in yeast-induced hyperthermia. The results obtained suggest anti-inflammatory, analgesic, and antipyretic properties of VCO. PMID:20645831

  4. Two-Dimensional Mapping of the He D3/Hβ Emission Ratio in Solar Prominences

    NASA Astrophysics Data System (ADS)

    Wiehr, Eberhard; Stellmacher, Goetz; Hirzberger, Johann

    2007-01-01

    Solar prominences have been simultaneously observed in the integrated light of the He D3 and the Hβ emissions on two successive days, using the SST on La Palma with its tip-tilt mirror locked on a nearby white-light limb facular grain. The spatial and the temporal variation of the integrated line intensities and their ratio shows mainly two characteristics: (A) Constant emission ratio (even) in regions with substantial intensity variations and (B) varying emission ratio (often) tightly related to intensity structures of the prominence. (A) May be explained by a different number of superposing threads along the line of sight having very similar physical state. (B) Indicates threads with different intrinsic physical states; these may depend on the gas pressure or the inner structure of each thread, i.e., the “packing density,” affecting the penetration of ionizing EUV radiation, which affects the He I level populations and thus the rate of the triplet excitation.

  5. Use and diversity of palm (Arecaceae) resources in Central Western Brazil.

    PubMed

    Martins, Renata Corrêa; Filgueiras, Tarciso de Sousa; Albuquerque, Ulysses Paulino

    2014-01-01

    Arecaceae Schultz-Sch. (Palmae Juss.), a member of the monocotyledon group, is considered one of the oldest extant angiosperm families on Earth. This family is highly valuable because of its species diversity, its occurrence in a wide range of habitats, and its status as an integral part of the culture and the family-based economy of many traditional and nontraditional communities. The main objectives of this study were to perform an ethnobotanical study involving these palms and a "Quilombola" (Maroon) community in the municipality of Cavalcante, GO, Brazil. The variables gender, age, and formal schooling had no influence on the number of species recognized and used by the Kalungas. Ethnobotanical studies based on traditional knowledge in addition to use and management of palms are fundamental aspects for planning and appliance of public policies directed to the use of natural resources and improvement of life quality.

  6. The commissioning instrument for the Gran Telescopio Canarias: made in Mexico

    NASA Astrophysics Data System (ADS)

    Cuevas, Salvador; Sánchez, Beatriz; Bringas, Vicente; Espejo, Carlos; Flores, Rubén; Chapa, Oscar; Lara, Gerardo; Chavoya, Armando; Anguiano, Gustavo; Arciniega, Sadot; Dorantes, Ariel; Gonzalez, José L.; Montoya, Juan M.; Toral, Rafael; Hernández, Hugo; Nava, Roberto; Devaney, Nicolas; Castro, Javier; Cavaller, Luis; Farah, Alejandro; Godoy, Javier; Cobos, Francisco; Tejada, Carlos; Garfias, Fernando

    2006-02-01

    In March 2004 was accepted in the site of Gran Telescopio Canarias (GTC) in La Palma Island, Spain, the Commissioning Instrument (CI) for the GTC. During the GTC integration phase, the CI will be a diagnostic tool for performance verification. The CI features four operation modes-imaging, pupil imaging, Curvature Wave-front sensing (WFS), and high resolution Shack-Hartmann WFS. This instrument was built by the Instituto de Astronomia UNAM in Mexico City and the Centro de Ingenieria y Desarrollo Industrial (CIDESI) in Queretaro, Qro under a GRANTECAN contract after an international public bid. Some optical components were built by Centro de Investigaciones en Optica (CIO) in Leon Gto and the biggest mechanical parts were manufactured by Vatech in Morelia Mich. In this paper we made a general description of the CI and we relate how this instrument, build under international standards, was entirely made in Mexico.

  7. Edaphic and light conditions of sympatric plant morphotypes in western Amazonia

    PubMed Central

    2014-01-01

    Abstract Here I present a dataset of edaphic and light conditions associated with the occurrence of sympatric morphotypes of Geonoma macrostachys (Arecaceae/Palmae), a candidate case study from Amazonia hypothesized to have evolved under ecological speciation. Transects were established in three lowland rainforests in Peru, and the abundance of each local morphotype of this species was recorded in a total area of 4.95 hectares. Composite soil samples and hemispherical photographs were taken along the transects were the species occurred to obtain information on soil nutrients, soil texture, and indirect measurements of light availability. The raw and summary tables disclose the characteristics of each study site and habitats within them, which could be useful to soil scientists, ecologists, and conservationists engaged in similar research activities or meta-analyses in Amazonia. PMID:24891831

  8. Enabling schools and public access to the Liverpool Robotic Telescope

    NASA Astrophysics Data System (ADS)

    Steele, Iain A.; Newsam, Andrew M.; Mottram, C. J.; McNerney, Paul

    2000-06-01

    Five per-cent of the observing time on the Liverpool Telescope (a 2-m robotic telescope sited in La Palma) will be set aside for public understanding of science. Schools access will be via, a queue scheduling mechanism, and public access via live Planetarium shows. We describe the development and performance of a generic Java message passing system to allow communication between the processes implementing the robotic control of the telescope and the remote processes that will be run at the Planetarium. We also describe an adaptive data compression algorithm to allow transfer of data back from the telescope in near real time and our software for Planetarium access which allows staff at the Planetarium to implement their own control system and display software. Finally we describe our hierarchical web-based system for schools to input observation requests and the image processing software we have developed to allow them to make quantitative measurements of the resulting data.

  9. Development of the quality control system of the readout electronics for the large size telescope of the Cherenkov Telescope Array observatory

    NASA Astrophysics Data System (ADS)

    Konno, Y.; Kubo, H.; Masuda, S.; Paoletti, R.; Poulios, S.; Rugliancich, A.; Saito, T.

    2016-07-01

    The Cherenkov Telescope Array (CTA) is the next generation VHE γ-ray observatory which will improve the currently available sensitivity by a factor of 10 in the range 100 GeV to 10 TeV. The array consists of different types of telescopes, called large size telescope (LST), medium size telescope (MST) and small size telescope (SST). A LST prototype is currently being built and will be installed at the Observatorio Roque de los Muchachos, island of La Palma, Canary islands, Spain. The readout system for the LST prototype has been designed and around 300 readout boards will be produced in the coming months. In this note we describe an automated quality control system able to measure basic performance parameters and quickly identify faulty boards.

  10. Recent Results from the Wide Angle Search for Planets (WASP) Prototype

    NASA Astrophysics Data System (ADS)

    Kane, S. R.; Horne, K.; Street, R. A.; Pollaco, D. L.; James, D.; Tsapras, Y.; Collier Cameron, A.

    WASP0 is a prototype for what is intended to become a collection of WASPs whose primary aim is to detect transiting extrasolar planets across the face of their parent star. The WASP0 instrument is a wide-field (9-degree) 6.3 cm aperture F/2.8 Apogee 10 CCD camera (2Kx2K chip, 16-arcsec pixels). The camera is mounted piggy-back on a commercial 10-inch Meade telescope. We present some recent results from the WASP camera, including observations from La Palma of the known transiting planet around HD 209458 and preliminary analysis of other stars located in the same field. We also outline further problems which restrict the ability to achieve photon limited precision with a wide-field commercial CCD.

  11. CANARY phase B: on-sky open-loop tomographic LGS AO results

    NASA Astrophysics Data System (ADS)

    Morris, Tim; Gendron, Eric; Basden, Alastair; Martin, Olivier; Osborn, James; Henry, David; Hubert, Zoltan; Sivo, Gaetano; Gratadour, Damien; Chemla, Fanny; Sevin, Arnaud; Cohen, Matthieu; Younger, Eddy; Vidal, Fabrice; Wilson, Richard; Butterley, Tim; Bitenc, Urban; Reeves, Andrew; Bharmal, Nazim; Raynaud, Henri-François; Kulcsar, Caroline; Conan, Jean-Marc; Huet, Jean-Michel; Perret, Denis; Dickson, Colin; Atkinson, David; Bailie, Tom; Longmore, Andy; Todd, Stephen; Talbot, Gordon; Morris, Simon; Rousset, Gérard; Myers, Richard

    2014-07-01

    CANARY is an on-sky Laser Guide Star (LGS) tomographic AO demonstrator that has been in operation at the 4.2m William Herschel Telescope (WHT) in La Palma since 2010. In 2013, CANARY was upgraded from its initial configuration that used three off-axis Natural Guide Stars (NGS) through the inclusion of four off-axis Rayleigh LGS and associated wavefront sensing system. Here we present the system and analysis of the on-sky results obtained at the WHT between May and September 2014. Finally we present results from the final `Phase C' CANARY system that aims to recreate the tomographic configuration to emulate the expected tomographic AO configuration of both the AOF at the VLT and E-ELT.

  12. Assessing the contribution from different parts of Canary islands to the hemispheric spectral sky radiance levels over European Northern Observatories

    NASA Astrophysics Data System (ADS)

    Aubé, Martin

    2015-03-01

    In this paper, we suggest to use a sky radiance model which accounts for heterogeneous distribution of light fixtures, their photometry, the ground reflectance and topography, to infer the point to point contribution of Canary Islands to the artificial sky radiance at Observatorio del Teide (Tenerife) and Observatorio Roque de los Muchachos (La Palma). In-situ hyperspectral sky radiance measurements, acquired on site in 2010, have been used to calibrate the model and to evaluate its inherent error. We aim to identify and characterize zones at which any lighting level increase or decrease may have a larger impact on light pollution at both European Northern Observatory sites, and then help to control and/or reduce their light pollution levels. This innovative methodology, can then be seen as a high level decision tool to help local authorities to restrict or reduce light pollution with the objective of protecting research class astronomical sites.

  13. Evidence for CNO processed material in the accretion disk of GP Comae

    SciTech Connect

    Marsh, T.R.; Horne, K.; Rosen, S. London Univ. College, Dorking )

    1991-01-01

    NIR spectroscopic observations of GP Com are reported. Data obtained using the 2.5-m Isaac Newton Telescope and the 4.2-m William Herschel Telescope at La Palma during April and June 1988 and with the 5-m Hale reflector at Palomar Observatory during January 1983 are presented in tables and sample spectra and discussed in detail. Number ratios H/He less than 0.00001, N/O = about 50, and N/C greater than 100 are calculated under the assumption of a uniform optically thin slab of gas in LTE. From the N overabundance it is inferred that the material observed is being extracted by Roche-lobe overflow from the secondary's H-exhausted core, at a time after most C and O have been converted to N in the CNO cycle. 33 refs.

  14. A homogeneous photometric and spectroscopic survey of open clusters in the Perseus Arm

    NASA Astrophysics Data System (ADS)

    Marco, Amparo; Negueruela, Ignacio; Monguió, Maria

    2015-08-01

    We are carrying out a homogeneous photometric survey of all young (< 100 Ma) open clusters in the Perseus Arm between Galactic longitudes 90º and 140º, using Strömgren filters at the Isaac Newton Telescope in La Palma. We intend to derive relative ages and distances with typical accuracies of 5 Ma and 200 pc. Our data will allow us to test the predictions of different models for the main mechanism producing the spiral structure of the Milky Way. In addition, we will enormously improve our knowledge of stellar evolution for stars in the 6-15 Msolar range. Moreover, the huge dataset of homogeneous photometry for thousands of stars (including ~2000 B-type stars) will have an enormous legacy value

  15. WATER-ICE-DRIVEN ACTIVITY ON MAIN-BELT COMET P/2010 A2 (LINEAR)?

    SciTech Connect

    Moreno, F.; Ortiz, J. L.; Cabrera-Lavers, A.; Augusteijn, T.; Liimets, T.; Lindberg, J. E.; Pursimo, T.; RodrIguez-Gil, P.; Vaduvescu, O.

    2010-08-01

    The dust ejecta of Main-Belt Comet P/2010 A2 (LINEAR) have been observed with several telescopes at the Observatorio del Roque de los Muchachos on La Palma, Spain. Application of an inverse dust tail Monte Carlo method to the images of the dust ejecta from the object indicates that a sustained, likely water-ice-driven, activity over some eight months is the mechanism responsible for the formation of the observed tail. The total amount of the dust released is estimated to be 5 x 10{sup 7} kg, which represents about 0.3% of the nucleus mass. While the event could have been triggered by a collision, this cannot be determined from the currently available data.

  16. VizieR Online Data Catalog: Circumnuclear star-forming regions (Alvarez-Alvarez+, 2015)

    NASA Astrophysics Data System (ADS)

    Alvarez-Alvarez, M.; Diaz, A. I.; Terlevich, E.; Terlevich, R.

    2016-01-01

    In order to achieve our scientific goals, we have studied a diverse population of galaxies with reported circumnuclear rings of SFRs in the bibliography. The data were acquired during five observing runs. For the first two runs (from 1988 to 1990), we used a blue sensitive GEC CCD at the f/15 Cassegrain focus of the 1.0m. Jacobus Kaptein Telescope of the Isaac Newton Group at the Observatorio del Roque de los Muchachos, La Palma, Spain. The CCD had 578x385 pixels 22um wide. The last three observing runs were carried on from 1999 to 2000 at the Centro Astronomico Hispano Aleman de Calar Alto, Almeria, Spain. (3 data files).

  17. Scientific and Technical Support for the Galileo Net Flux Radiometer Experiment

    NASA Technical Reports Server (NTRS)

    Sromovsky, Lawrence A.

    1997-01-01

    This report describes work in support of the Galileo Net Flux Radiometer (NFR), an instrument mounted on the Galileo probe, a spacecraft designed for entry into and direct measurements of Jupiter's atmosphere. Tasks originally proposed for the post launch period are briefly as follows: attend and support PSG (Project Science Group) and other project science meetings; support in-flight checkouts; maintain and keep safe the spare instrument and GSE (Ground Support Equipment); organize and maintain documentation; finish NFR calibration measurements, documentation, and analysis; characterize and diagnose instrument anomalies; develop descent data analysis tools; and science data analysis and publication. Because we had the capability to satisfy a project support need we also subsequently proposed and were funded to make ground- based observations of Jupiter during the period surrounding the Galileo arrival at Jupiter, using the Swedish Solar Telescope at La Palma, Canary Islands. The following section (11) provides background information on the NFR instrument.

  18. Evidence for CNO processed material in the accretion disk of GP Comae

    NASA Technical Reports Server (NTRS)

    Marsh, T. R.; Horne, Keith; Rosen, Simon

    1991-01-01

    NIR spectroscopic observations of GP Com are reported. Data obtained using the 2.5-m Isaac Newton Telescope and the 4.2-m William Herschel Telescope at La Palma during April and June 1988 and with the 5-m Hale reflector at Palomar Observatory during January 1983 are presented in tables and sample spectra and discussed in detail. Number ratios H/He less than 0.00001, N/O = about 50, and N/C greater than 100 are calculated under the assumption of a uniform optically thin slab of gas in LTE. From the N overabundance it is inferred that the material observed is being extracted by Roche-lobe overflow from the secondary's H-exhausted core, at a time after most C and O have been converted to N in the CNO cycle.

  19. The magnetic field and the evolution of element spots on the surface of the HgMn eclipsing binary ARAur

    NASA Astrophysics Data System (ADS)

    Hubrig, S.; Savanov, I.; Ilyin, I.; González, J. F.; Korhonen, H.; Lehmann, H.; Schöller, M.; Granzer, T.; Weber, M.; Strassmeier, K. G.; Hartmann, M.; Tkachenko, A.

    2010-10-01

    The system ARAur is a young late B-type double-lined eclipsing binary with a primary star of HgMn peculiarity. We applied the Doppler imaging method to reconstruct the distribution of Fe and Y over the surface of the primary using spectroscopic time series obtained in 2005 and from 2008 October to 2009 February. The results show a remarkable evolution of the element distribution and overabundances. Measurements of the magnetic field with the moment technique using several elements reveal the presence of a longitudinal magnetic field of the order of a few hundred gauss in both stellar components and a quadratic field of the order of 8kG on the surface of the primary star. Based on observations obtained at the 2.56-m Nordic Optical Telescope on La Palma, the Karl-Schwarzschild-Observatorium in Tautenburg and the STELLA robotic telescope on Tenerife. E-mail: shubrig@aip.de

  20. Instruments for monitoring intensive care unit sedation

    PubMed Central

    Carrasco, Genís

    2000-01-01

    Although many promising objective methods (measuring systems) are available, there are no truly validated instruments for monitoring intensive care unit (ICU) sedation. Auditory evoked potentials can be used only for research in patients with a deep level of sedation. Other measuring systems require further development and validation to be useful in the ICU. Continuing research will provide an objective system to improve the monitoring and controlling of this essential treatment for ICU patients. Subjective methods (scoring systems) that are based on clinical observation have proven their usefulness in guiding sedative therapy. The Glasgow Coma Score modified by Cook and Palma (GCSC) achieves good face validity and reliability, which assures its clinical utility for routine practice and research. Other scales, in particular the Ramsay Scale, can be recommended preferably for clinical use. An accurate use of available instruments can improve the sedative treatment that we deliver to our patients. PMID:11094504

  1. Alignment of atmospheric mineral dust due to electric field

    NASA Astrophysics Data System (ADS)

    Ulanowski, Z.; Bailey, J.; Lucas, P. W.; Hough, J. H.; Hirst, E.

    2007-12-01

    Optical polarimetry observations on La Palma, Canary Islands, during a Saharan dust episode show dichroic extinction indicating the presence of vertically aligned particles in the atmosphere. Modelling of the extinction together with particle orientation indicates that the alignment could have been due to an electric field of the order of 2 kV/m. Two alternative mechanisms for the origin of the field are examined: the effect of reduced atmospheric conductivity and charging of the dust layer, the latter effect being a more likely candidate. It is concluded that partial alignment may be a common feature of Saharan dust layers. The modelling indicates that the alignment can significantly alter dust optical depth. This "Venetian blind effect" may have decreased optical thickness in the vertical direction by as much as 10% for the case reported here. It is also possible that the alignment and the electric field modify dust transport.

  2. Alignment of atmospheric mineral dust due to electric field

    NASA Astrophysics Data System (ADS)

    Ulanowski, Z.; Bailey, J.; Lucas, P. W.; Hough, J. H.; Hirst, E.

    2007-09-01

    Optical polarimetry observations on La Palma, Canary Islands, during a Saharan dust episode show dichroic extinction consistent with the presence of vertically aligned particles in the atmosphere. Modelling of the extinction together with particle orientation indicates that the alignment could have been due to an electric field of the order of 2 kV/m. Two alternative mechanisms for the origin of the field are examined: the effect of reduced atmospheric conductivity and charging of the dust layer, the latter effect being a more likely candidate. It is concluded that partial alignment may be a common feature of Saharan dust layers. The modelling also indicates that the alignment can significantly alter dust optical depth. This "Venetian blind effect" may have decreased optical thickness in the vertical direction by as much as 10% for the case reported here.

  3. Multivariate data validation for investigating primary HCMV infection in pregnancy.

    PubMed

    Barberini, Luigi; Noto, Antonio; Saba, Luca; Palmas, Francesco; Fanos, Vassilios; Dessì, Angelica; Zavattoni, Maurizio; Fattuoni, Claudia; Mussap, Michele

    2016-12-01

    We reported data concerning the Gas Chromatography-Mass Spectrometry (GC-MS) based metabolomic analysis of amniotic fluid (AF) samples obtained from pregnant women infected with Human Cytomegalovirus (HCMV). These data support the publication "Primary HCMV Infection in Pregnancy from Classic Data towards Metabolomics: an Exploratory analysis" (C. Fattuoni, F. Palmas, A. Noto, L. Barberini, M. Mussap, et al., 2016) [2]. GC-MS and Multivariate analysis allow to recognize the molecular phenotype of HCMV infected fetuses (transmitters) and that of HCMV non-infected fetuses (non-transmitters); moreover, GC-MS and multivariate analysis allow to distinguish and to compare the molecular phenotype of these two groups with a control group consisting of AF samples obtained in HCMV non-infected pregnant women. The obtained data discriminate controls from transmitters as well as from non-transmitters; no statistically significant difference was found between transmitters and non-transmitters. PMID:27656676

  4. Whole atmospheric-turbulence profiling with generalized scidar.

    PubMed

    Avila, R; Vernin, J; Masciadri, E

    1997-10-20

    Statistical analysis of stellar scintillation on the pupil of a telescope, known as the scidar (scintillation, detection, and ranging) technique, is sensitive only to atmospheric turbulence at altitudes higher than a few kilometers. With the generalized scidar technique, recently proposed and tested under laboratory conditions, one can overcome this limitation by analyzing the scintillation on a plane away from the pupil. We report the first experimental implementation of this technique, to our knowledge, under real atmospheric conditions as a vertical profiler of the refractive-index structure constant C (N)(2) (h). The instrument was adapted to the Nordic Optical Telescope and the William Hershel Telescope at La Palma, Canary Islands. We measure the spatial autocorrelation function of double-star scintillation for different positions of the analysis plane, finding good agreement with theoretical expectations.

  5. Naked eye visibility of Sirius in broad daylight.

    PubMed

    Können, Gunther P; Tinbergen, Jaap; Stammes, Piet

    2015-02-01

    Sirius was spotted with the naked eye at broad daylight by looking along the finder of a 1 m telescope on La Palma Observatory at a 2370 m height. Sun elevation was 73°; Sirius was nearly straight under the Sun at 37° elevation. The sky radiance, although not recorded directly, could be determined from the simultaneously obtained high-precision wavelength-dependent sky polarization data near Sirius. This was done by fitting the polarization data with the doubling-adding KNMI (DAK) radiative transfer model, which provided the values of the surface albedo and of the aerosol optical thickness required for determining the absolute sky radiance. Our analysis implies that Sirius, when positioned overhead, can be a daytime naked eye object from sea level even if its culmination occurs at solar noon. It also suggests that the second-brightest star (Canopus), if positioned overhead, could be perceptible even at solar noon.

  6. VizieR Online Data Catalog: GAPS V: Global analysis of the XO-2 system (Damasso+, 2015)

    NASA Astrophysics Data System (ADS)

    Damasso, M.; Biazzo, K.; Bonomo, A. S.; Desidera, S.; Lanza, A. F.; Nascimbeni, V.; Esposito, M.; Scandariato, G.; Sozzetti, A.; Cosentino, R.; Gratton, R.; Malavolta, L.; Rainer, M.; Gandolfi, D.; Poretti, E.; Zanmar Sanchez, R.; Ribas, I.; Santos, N.; Affer, L.; Andreuzzi, G.; Barbieri, M.; Bedin, L. R.; Benatti, S.; Bernagozzi, A.; Bertolini, E.; Bonavita, M.; Borsa, F.; Borsato, L.; Boschin, W.; Calcidese, P.; Carbognani, A.; Cenadelli, D.; Christille, J. M.; Claudi, R. U.; Covino, E.; Cunial, A.; Giacobbe, P.; Granata, V.; Harutyunyan, A.; Lattanzi, M. G.; Leto, G.; Libralato, M.; Lodato, G.; Lorenzi, V.; Mancini, L.; Martinez Fiorenzano, A. F.; Marzari, F.; Masiero, S.; Micela, G.; Molinari, E.; Molinaro, M.; Munari, U.; Murabito, S.; Pagano, I.; Pedani, M.; Piotto, G.; Rosenberg, A.; Silvotti, R.; Southworth, J.

    2015-01-01

    Photometric data of the two companion stars in the XO-2 binary system, and radial velocities of XO-2N used in our analysis. Transit light curves of XO-2N and related to its hot Jupiter XO-2Nb come from the TASTE project (Nasimbeni et al., 2011A&A...527A..85N, Cat. J/A+A/527/A85). Light curves of both XO-2N and XO-2S were collected by the APACHE survey (e.g. Sozzetti et al., Hot Planets and Cool Stars, EPJ Web of Conferences, Volume 47, id.03006, 2013) and were used in particular to determine the rotation period of the two binary components. Radial velocities of XO-2N were measured with the HARPS-N spectrograph at the Telescopio Nazionale Galileo (TNG), based at La Palma, Canary islands. (4 data files).

  7. Taxonomic history and invasion biology of two Phyllonorycter leaf miners (Lepidoptera: Gracillariidae) with links to taxonomic and molecular datasets.

    PubMed

    De Prins, Jurate; De Prins, Willy; De Coninck, Eliane; Kawahara, Akito Y; Milton, Megan A; Hebert, Paul D N

    2013-01-01

    This paper deals with two European species, Phyllonorycter mespilella (Hübner, 1805) and P. trifasciella (Haworth, 1828), that have colonized the subtropical Canary Islands. The Rosaceae leaf miner, P. mespilella, is recorded for the first time from Lanzarote and La Palma, while the Caprifoliaceae leaf miner, P. trifasciella, is recorded from Tenerife. We present the diagnoses of these species based on morphology, a preliminary DNA barcode (COI) library of congeneric and con-familial species, and discuss the taxonomic position of the colonizers within the blancardella and trifasciella species groups. The recent intensification of anthropogenic disturbance likely accounts for their range expansion, an event that may impact the relict flora present on the Canary Islands. PMID:26240915

  8. The first close-up of the ``flip-flop'' phenomenon in a single star

    NASA Astrophysics Data System (ADS)

    Korhonen, H.; Berdyugina, S. V.; Strassmeier, K. G.; Tuominen, I.

    2001-11-01

    We present temperature maps of the active late-type giant FK Com which exhibit the first imagining record of the ``flip-flop'' phenomenon in a single star. The phenomenon, in which the main part of the spot activity shifts 180° in longitude, discovered a decade ago in FK Com, was reported later also in a number of RS CVn binaries and a single young dwarf. With the surface images obtained right before and after the ``flip-flop'', we clearly show that the ``flip-flop'' phenomenon in FK Com is caused by changing the relative strengths of the spot groups at the two active longitudes, with no actual spot movements across the stellar surface, i.e. exactly as it happens in other active stars. Based on the observations obtained at the Kitt Peak National Observatory, USA; the Automatic Photometric Telescope, Phoenix 10, Arizona, USA; the Nordic Optical Telescope, Observatorio Roque de los Muchachos, La Palma, Canary Islands, Spain.

  9. Design and operation of FACT - the first G-APD Cherenkov telescope

    NASA Astrophysics Data System (ADS)

    Anderhub, H.; Backes, M.; Biland, A.; Boccone, V.; Braun, I.; Bretz, T.; Buß, J.; Cadoux, F.; Commichau, V.; Djambazov, L.; Dorner, D.; Einecke, S.; Eisenacher, D.; Gendotti, A.; Grimm, O.; von Gunten, H.; Haller, C.; Hildebrand, D.; Horisberger, U.; Huber, B.; Kim, K.-S.; Knoetig, M. L.; Köhne, J.-H.; Krähenbühl, T.; Krumm, B.; Lee, M.; Lorenz, E.; Lustermann, W.; Lyard, E.; Mannheim, K.; Meharga, M.; Meier, K.; Montaruli, T.; Neise, D.; Nessi-Tedaldi, F.; Overkemping, A.-K.; Paravac, A.; Pauss, F.; Renker, D.; Rhode, W.; Ribordy, M.; Röser, U.; Stucki, J.-P.; Schneider, J.; Steinbring, T.; Temme, F.; Thaele, J.; Tobler, S.; Viertel, G.; Vogler, P.; Walter, R.; Warda, K.; Weitzel, Q.; Zänglein, M.

    2013-06-01

    The First G-APD Cherenkov Telescope (FACT) is designed to detect cosmic gamma-rays with energies from several hundred GeV up to about 10 TeV using the Imaging Atmospheric Cherenkov Technique. In contrast to former or existing telescopes, the camera of the FACT telescope is comprised of solid-state Geiger-mode Avalanche Photodiodes (G-APD) instead of photomultiplier tubes for photo detection. It is the first full-scale device of its kind employing this new technology. The telescope is operated at the Observatorio del Roque de los Muchachos (La Palma, Canary Islands, Spain) since fall 2011. This paper describes in detail the design, construction and operation of the system, including hardware and software aspects. Technical experiences gained after one year of operation are discussed and conclusions with regard to future projects are drawn.

  10. Calibration and performance of the photon sensor response of FACT — the first G-APD Cherenkov telescope

    NASA Astrophysics Data System (ADS)

    Biland, A.; Bretz, T.; Buß, J.; Commichau, V.; Djambazov, L.; Dorner, D.; Einecke, S.; Eisenacher, D.; Freiwald, J.; Grimm, O.; von Gunten, H.; Haller, C.; Hempfling, C.; Hildebrand, D.; Hughes, G.; Horisberger, U.; Knoetig, M. L.; Krähenbühl, T.; Lustermann, W.; Lyard, E.; Mannheim, K.; Meier, K.; Mueller, S.; Neise, D.; Overkemping, A.-K.; Paravac, A.; Pauss, F.; Rhode, W.; Röser, U.; Stucki, J.-P.; Steinbring, T.; Temme, F.; Thaele, J.; Vogler, P.; Walter, R.; Weitzel, Q.

    2014-10-01

    The First G-APD Cherenkov Telescope (FACT) is the first in-operation test of the performance of silicon photo detectors in Cherenkov Astronomy. For more than two years it is operated on La Palma, Canary Islands (Spain), for the purpose of long-term monitoring of astrophysical sources. For this, the performance of the photo detectors is crucial and therefore has been studied in great detail. Special care has been taken for their temperature and voltage dependence implementing a correction method to keep their properties stable. Several measurements have been carried out to monitor the performance. The measurements and their results are shown, demonstrating the stability of the gain below the percent level. The resulting stability of the whole system is discussed, nicely demonstrating that silicon photo detectors are perfectly suited for the usage in Cherenkov telescopes, especially for long-term monitoring purpose.

  11. Farming-up coastal fish assemblages through a massive aquaculture escape event.

    PubMed

    Toledo-Guedes, Kilian; Sanchez-Jerez, Pablo; Benjumea, María E; Brito, Alberto

    2014-07-01

    We investigated the changes on the mean trophic level of fish assemblages across different spatiotemporal scales, before and after a massive escape event occurred off La Palma (Canary Islands), which resulted in the release of 1.5 million fish (mostly Dicentrarchus labrax) into the wild. The presence of escaped fish altered significantly the mean trophic level of fish assemblages in shallow coastal waters. This alteration was exacerbated by the massive escape. A nearby marine protected area buffered the changes in mean trophic level but exhibited the same temporal patterns as highly fished areas. Moreover, escaped fish exploited natural resources according to their total length and possibly, time since escapement. New concerns arise as a "farming up" process is detected in shallow coastal fish assemblages where marine aquaculture is established.

  12. Assessing the impact of fishing in shallow rocky reefs: a multivariate approach to ecosystem management.

    PubMed

    Sangil, Carlos; Martín-García, Laura; Clemente, Sabrina

    2013-11-15

    In this paper we develop a tool to assess the impact of fishing on ecosystem functioning in shallow rocky reefs. The relationships between biological parameters (fishes, sea urchins, seaweeds), and fishing activities (fish traps, boats, land-based fishing, spearfishing) were tested in La Palma island (Canary Islands). Data from fishing activities and biological parameters were analyzed using principal component analyses. We produced two models using the first component of these analyses. This component was interpreted as a new variable that described the fishing pressure and the conservation status at each studied site. Subsequently the scores on the first axis were mapped using universal kriging methods and the models obtained were extrapolated across the whole island to display the expected fishing pressure and conservation status more widely. The fishing pressure and conservation status models were spatially related; zones where fishing pressure was high coincided with zones in the unhealthiest ecological state. PMID:24045124

  13. SIMULTANEOUS MULTIWAVELENGTH OBSERVATIONS OF MARKARIAN 421 DURING OUTBURST

    SciTech Connect

    Acciari, V. A.; Benbow, W.; Aliu, E.; Aune, T.; Beilicke, M.; Buckley, J. H.; Bugaev, V.; Dickherber, R.; Boettcher, M.; Bradbury, S. M.; Butt, Y.; Cannon, A.; Celik, O.; Chow, Y. C.; Cesarini, A.; Ciupik, L.; Cogan, P.; Colin, P.; Cui, W.; Duke, C. E-mail: cui@physics.purdue.ed

    2009-09-20

    We report on the results of two coordinated multiwavelength campaigns that focused on the blazar Markarian 421 during its 2006 and 2008 outbursts. These campaigns obtained UV and X-ray data using the XMM-Newton satellite, while the gamma-ray data were obtained utilizing three imaging atmospheric Cerenkov telescopes, the Whipple 10 m telescope and VERITAS, both based in Arizona, as well as the MAGIC telescope, based on La Palma in the Canary Islands. The coordinated effort between the gamma-ray groups allowed for truly simultaneous data in UV/X-ray/gamma-ray wavelengths during a significant portion of the XMM-Newton observations. This simultaneous coverage allowed for a reliable search for correlations between UV, X-ray, and gamma-ray variability over the course of the observations. Investigations of spectral hysteresis and modeling of the spectral energy distributions are also presented.

  14. Use and Diversity of Palm (Arecaceae) Resources in Central Western Brazil

    PubMed Central

    Martins, Renata Corrêa; Filgueiras, Tarciso de Sousa

    2014-01-01

    Arecaceae Schultz-Sch. (Palmae Juss.), a member of the monocotyledon group, is considered one of the oldest extant angiosperm families on Earth. This family is highly valuable because of its species diversity, its occurrence in a wide range of habitats, and its status as an integral part of the culture and the family-based economy of many traditional and nontraditional communities. The main objectives of this study were to perform an ethnobotanical study involving these palms and a “Quilombola” (Maroon) community in the municipality of Cavalcante, GO, Brazil. The variables gender, age, and formal schooling had no influence on the number of species recognized and used by the Kalungas. Ethnobotanical studies based on traditional knowledge in addition to use and management of palms are fundamental aspects for planning and appliance of public policies directed to the use of natural resources and improvement of life quality. PMID:24772040

  15. VizieR Online Data Catalog: Robotic view of 67P perihelion (Snodgrass+, 2016)

    NASA Astrophysics Data System (ADS)

    Snodgrass, C.; Opitom, C.; de Val-Borro, M.; Jehin, E.; Manfroid, J.; Lister, T.; Marchant, J.; Jones, G. H.; Fitzsimmons, A.; Steele, I. A.; Smith, R. J.; Jermak, H.; Granzer, T.; Meech, K. J.; Rousselot, P.; Levasseur-Regourd, A.-C.

    2016-09-01

    Tables listing the observations of comet 67P taken around its 2015 perihelion, using various robotic telescopes, and the resulting R-band photometry from these observations. Telescopes used are the 2m Liverpool Telescope, La Palma, the 1.2m STELLA telescope, Tenerife, the 0.6m TRAPPIST telescope, La Silla, and the network of 1m and 2m telescopes operated by Las Cumbres Global Telescope network (LCOGT) at the CTIO, Sutherland, McDonald and Siding Spring observatories. Photometry is measured in an aperture with radius equal to 10000km at the distance of the comet. object.dat : -------------------------------------------------------------------------------- Code Name Elem q e i H1 d AU deg mag -------------------------------------------------------------------------------- 67P P/Churyumov-Gerasimenko 2454890.5 1.2465141 0.6401757 7.040861 11.63 (2 data files).

  16. The Gran Telescopio Canarias (GTC) project

    NASA Astrophysics Data System (ADS)

    Alvarez, P.; Rodríguez Espinosa, J. M.; Sánchez, F.

    1998-11-01

    The outstanding quality of the Canarian sky, protected by law, makes it feasible to install the largest telescopes in the world at the observatories of the Instituto de Astrofı´sica de Canarias (IAC), which has promoted the design and construction of the Gran Telescopio Canarias (GTC). The GTC is a high-performance 10-m class telescope to be installed at the Roque de los Muchachos Observatory (ORM), on the island of La Palma. First light is planned for the end of 2002. The GTC conceptual design was completed in mid-1997. It emphasizes as the main scientific drivers image quality, operational efficiency and reliability. The GTC preliminary design is now proceeding in all aspects of the project. The Spanish and local Canarian Governments are now fully committed to the GTC Project. The scientific drivers are described here, as well as the current technical, managerial, and operational baselines.

  17. Role of U(VI) Reduction by Geobacter species

    SciTech Connect

    Lovely, Derrick

    2008-12-23

    Previous work had suggested that Acholeplasma palmae has a higher capacity for uranium sorption than other bacteria studied. Sorption studies were performed with cells in suspension in various solutions containing uranium, and results were used to generate uranium-biosorption isotherms. Results from this study showed that the U(VI) sorption capacity of G. uraniireducens was relatively similar in simple solutions, such as sodium chloride or bicarbonate. However, this ability to sorb uranium significantly decreased in groundwater. This suggested that certain chemicals present in the groundwater were inhibiting the ability of cell components of Geobacter to adsorb uranium. It was hypothesized that uranium removal would also be diminished in the bicarbonate solution. However, this did not seem to be the case, as uranium was as easily removed in the bicarbonate solution as in the sodium chloride solution.

  18. Photometric Variability of Magnetic White Dwarfs

    NASA Astrophysics Data System (ADS)

    Lawrie, K. A.; Burleigh, M. R.; Brinkworth, C. S.; Marsh, T. R.; Hodgkin, S. T.; Baker, D. E. A.; Cossins, P.; Littlejohns, O. M.; Scott, A. E.; Steele, P. R.

    2013-01-01

    We present our survey results searching for photometric variability and rotation periods of 77 magnetic white dwarfs (MWDs). The sample consists of 24 bright (V < 16), isolated MWDs and 53 MWDs (r' < 18.5) discovered spectroscopically by SDSS. Observations were taken with the 2.5 m Isaac Newton Telescope, La Palma. We determine well-defined periods for 12 stars (16% of the sample) and variability but with poorly constrained periods in a further 13 targets (17%). A period of 7.72 days is found for LHS 5064, the second longest measured for an isolated MWD. Where periods of variability have been determined, the magnetic field strength, temperature, mass and age of the white dwarf have been compared to determine whether any physically interesting correlations emerge.

  19. Origin and significance of the 2011 El Hierro xeno-pumice

    NASA Astrophysics Data System (ADS)

    Zaczek-Pedroza, Kirsten; Troll, Valentin R.; Deegan, Frances M.; Meade, Fiona C.; Burchardt, Steffi; Carracedo, Juan C.; Klügel, Andreas; Harris, Chris; Wiesmaier, Sebastian; Berg, Sylvia E.; Barker, Abigail K.

    2014-05-01

    samples to be Si-oversaturated, partly corundum-normative, but with not magmatic mineral components in the norm. 5) Trace element concentrations of xeno-pumice are unlike any magmatic rocks from El Hierro and La Palma, but similar to known sedimentary rocks from the region. 6) A distinct Eu anomaly, typical for continentally derived sediment, is present in xeno-pumice but absent in El Hierro and La Palma magmatic rocks. Lastly, 7) Oxygen isotope values range from 9.1 to 11.6 o (n=6), which are elevated with respect to magmatic rocks from the Canaries (5.2 to ~ 7 o), but are characteristic for sediment derived from a mixture of continental (S- and I-type) granite sources. The combined datasets allow for a more thorough discussion on the origin of El Hierro xeno-pumice and we conclude that xeno-pumice is compositionally akin to sedimentary rocks from the region, but strikingly dissimilar to magmatic rocks from El Hierro and La Palma. We suggest a dominantly sedimentary origin for xeno-pumice. Xeno-pumice is therefore not an indicator for explosive felsic magma within volcanic plumbing systems, but a reflection of magma-crust interaction during ascent and emplacement. The occurrence of similar frothy sedimentary xenoliths in recent and historical eruptions on Lanzarote, Gran Canaria, Tenerife and La Palma make a case for xeno-pumice being a common phenomenon in the region.

  20. Radio and Optical Follow-Up Observations and Improved IPN Position of GRB 970111

    NASA Technical Reports Server (NTRS)

    Galama, T. J.; Groot, P. J.; Strom, R. G.; vanParadijs, J.; Hurley, K.; Kouveliotou, C.; Fishman, G. J.; Meegan, C. A.; Heise, J.; intZand, J. J. M.

    1997-01-01

    We report on Westerbork 840 MHz, 1.4 and 5 GHz radio observations of the improved IPN-WFC error box of the gamma ray burst GRB 970111, between 26.4 hours and 120 days after the event onset. In the approximately 16 sq arcmin area defined by the IPN (BATSE and Ulysses) annulus and the published refined BeppoSAX Wide Field Camera (WFC) error box we detected no steady sources brighter than 0.56 mJy (4sigma), and no varying radio emission, down to 1.0 mJy (4sigma). We also report on B, V, R and I band observations of the error box with the 4.2 m William Herschel Telescope at La Palma. Subject headings: gamma rays: bursts - gamma rays: individual (GRB 9701 1 1)

  1. Simultaneous Multiwavelength Observations of Markarian 421 During Outburst

    NASA Astrophysics Data System (ADS)

    Acciari, V. A.; Aliu, E.; Aune, T.; Beilicke, M.; Benbow, W.; Böttcher, M.; Bradbury, S. M.; Buckley, J. H.; Bugaev, V.; Butt, Y.; Cannon, A.; Celik, O.; Cesarini, A.; Chow, Y. C.; Ciupik, L.; Cogan, P.; Colin, P.; Cui, W.; Dickherber, R.; Duke, C.; Falcone, A. D.; Fegan, S. J.; Finley, J. P.; Finnegan, G.; Fortin, P.; Fortson, L.; Furniss, A.; Gall, D.; Gillanders, G. H.; Grube, J.; Guenette, R.; Gyuk, G.; Hanna, D.; Holder, J.; Horan, D.; Hui, C. M.; Humensky, T. B.; Kaaret, P.; Karlsson, N.; Kertzman, M.; Kieda, D.; Kildea, J.; Konopelko, A.; Krawczynski, H.; Krennrich, F.; Lang, M. J.; LeBohec, S.; Maier, G.; McCann, A.; Millis, J.; Moriarty, P.; Ong, R. A.; Otte, A. N.; Pandel, D.; Perkins, J. S.; Pichel, A.; Pohl, M.; Quinn, J.; Ragan, K.; Reyes, L. C.; Reynolds, P. T.; Roache, E.; Rose, H. J.; Schroedter, M.; Sembroski, G. H.; Smith, A. W.; Steele, D.; Swordy, S. P.; Theiling, M.; Toner, J. A.; Varlotta, A.; Vincent, S.; Wakely, S. P.; Ward, J. E.; Weekes, T. C.; Weinstein, A.; Weisgarber, T.; Williams, D. A.; Wissel, S.; Zitzer, B.; VERITAS Collaboration; de la Calle Perez, I.; Ibarra, A.; Anderhub, H.; Rodriguez, P.; Antonelli, L. A.; Antoranz, P.; Backes, M.; Baixeras, C.; Balestra, S.; Barrio, J. A.; Bastieri, D.; Becerra González, J.; Becker, J. K.; Bednarek, W.; Berger, K.; Bernardini, E.; Biland, A.; Bock, R. K.; Bonnoli, G.; Bordas, P.; Borla Tridon, D.; Bosch-Ramon, V.; Bose, D.; Braun, I.; Bretz, T.; Britvitch, I.; Camara, M.; Carmona, E.; Carosi, A.; Commichau, S.; Contreras, J. L.; Cortina, J.; Costado, M. T.; Covino, S.; Curtef, V.; Dazzi, F.; DeAngelis, A.; DeCea del Pozo, E.; Delgado Mendez, C.; Delos Reyes, R.; DeLotto, B.; DeMaria, M.; DeSabata, F.; Dominguez, A.; Dorner, D.; Doro, M.; Elsaesser, D.; Errando, M.; Ferenc, D.; Fernández, E.; Firpo, R.; Fonseca, M. V.; Font, L.; Galante, N.; García López, R. J.; Garczarczyk, M.; Gaug, M.; Goebel, F.; Hadasch, D.; Hayashida, M.; Herrero, A.; Hildebrand, D.; Höhne-Mönch, D.; Hose, J.; Hsu, C. C.; Jogler, T.; Kranich, D.; La Barbera, A.; Laille, A.; Leonardo, E.; Lindfors, E.; Lombardi, S.; Longo, F.; López, M.; Lorenz, E.; Majumdar, P.; Maneva, G.; Mankuzhiyil, N.; Mannheim, K.; Maraschi, L.; Mariotti, M.; Martínez, M.; Mazin, D.; Meucci, M.; Miranda, J. M.; Mirzoyan, R.; Miyamoto, H.; Moldón, J.; Moles, M.; Moralejo, A.; Nieto, D.; Nilsson, K.; Ninkovic, J.; Orito, R.; Oya, I.; Paoletti, R.; Paredes, J. M.; Pasanen, M.; Pascoli, D.; Pauss, F.; Pegna, R. G.; Perez-Torres, M. A.; Persic, M.; Peruzzo, L.; Prada, F.; Prandini, E.; Puchades, N.; Reichardt, I.; Rhode, W.; Ribó, M.; Rico, J.; Rissi, M.; Robert, A.; Rügamer, S.; Saggion, A.; Saito, T. Y.; Salvati, M.; Sanchez-Conde, M.; Satalecka, K.; Scalzotto, V.; Scapin, V.; Schweizer, T.; Shayduk, M.; Shore, S. N.; Sidro, N.; Sierpowska-Bartosik, A.; Sillanpää, A.; Sitarek, J.; Sobczynska, D.; Spanier, F.; Spiro, S.; Stamerra, A.; Stark, L. S.; Takalo, L.; Tavecchio, F.; Temnikov, P.; Tescaro, D.; Teshima, M.; Tluczykont, M.; Torres, D. F.; Turini, N.; Vankov, H.; Wagner, R. M.; Zabalza, V.; Zandanel, F.; Zanin, R.; Zapatero, J.; MAGIC Collaboration

    2009-09-01

    We report on the results of two coordinated multiwavelength campaigns that focused on the blazar Markarian 421 during its 2006 and 2008 outbursts. These campaigns obtained UV and X-ray data using the XMM-Newton satellite, while the gamma-ray data were obtained utilizing three imaging atmospheric Cerenkov telescopes, the Whipple 10 m telescope and VERITAS, both based in Arizona, as well as the MAGIC telescope, based on La Palma in the Canary Islands. The coordinated effort between the gamma-ray groups allowed for truly simultaneous data in UV/X-ray/gamma-ray wavelengths during a significant portion of the XMM-Newton observations. This simultaneous coverage allowed for a reliable search for correlations between UV, X-ray, and gamma-ray variability over the course of the observations. Investigations of spectral hysteresis and modeling of the spectral energy distributions are also presented.

  2. Air pollution and mortality in the Canary Islands: a time-series analysis

    PubMed Central

    2010-01-01

    Background The island factor of the cities of Las Palmas de Gran Canaria and Santa Cruz de Tenerife, along with their proximity to Africa and their meteorology, create a particular setting that influences the air quality of these cities and provides researchers an opportunity to analyze the acute effects of air-pollutants on daily mortality. Methods From 2000 to 2004, the relationship between daily changes in PM10, PM2.5, SO2, NO2, CO, and ozone levels and daily total mortality and mortality due to respiratory and heart diseases were assessed using Generalized Additive Poisson models controlled for potential confounders. The lag effect (up to five days) as well as the concurrent and previous day averages and distributed lag models were all estimated. Single and two pollutant models were also constructed. Results Daily levels of PM10, PM2.5, NO2, and SO2 were found to be associated with an increase in respiratory mortality in Santa Cruz de Tenerife and with increased heart disease mortality in Las Palmas de Gran Canaria, thus indicating an association between daily ozone levels and mortality from heart diseases. The effects spread over five successive days. SO2 was the only air pollutant significantly related with total mortality (lag 0). Conclusions There is a short-term association between current exposure levels to air pollution and mortality (total as well as that due specifically to heart and respiratory diseases) in both cities. Risk coefficients were higher for respiratory and cardiovascular mortality, showing a delayed effect over several days. PMID:20152037

  3. Variation among strains of Xanthomonas campestris pv. vasculorum from Mauritius and other countries based on fatty acid analysis.

    PubMed

    Dookun, A; Stead, D E; Autrey, L J

    2000-04-01

    Fatty acid profiling was used to study variation amongst strains of Xanthomonas campestris pv. vasculorum (Xcv). They could be divided into five groups using cellular fatty acid profiles. Group A strains represent a new and little known taxon and all came from plants of broom bamboo (Thysanolaena maxima) from Mauritius. Group B strains included the Xcv pathotype reference strain and were from palms, broom bamboo and sugarcane from Mauritius, Reunion and Australia. Group C contained southern African and Malagasy strains from sugarcane and maize, together with X. campestris pv. holcicola strain. No Mascarene strains fell into this group. Group D strains isolated from sugarcane, maize and royal palm (Roystonea regia) were from Mauritius and Reunion, the earliest known strains coming from Réunion. These groups represented in the Mascarene Islands possibly belong to three different Xanthomonas species. A further Group E comprised one Xcv strain (NCPPB 182) from Puerto Rico, one X. vasicola pv. holcicola strain plus 6 other unclassified Xanthomonas strains causing red stripe disease symptoms in sugarcane. Three of these groups occur on Mauritius and two occur on Réunion. Group B strains originally caused serious problems in noble canes. As resistant interspecific hybrids were introduced, group D strains appeared in Mauritius possibly being introduced from Reunion but having similar host ranges within the Gramineae and Palmae. The findings that 3 of these groups (A, B, D) can cause gumming disease in a grass species (T. maxima) and that 2 of them (B, D) also cause gumming disease in sugar cane (Gramineae) and palms (Palmae) is unusual.

  4. Pronounced fixation, strong population differentiation and complex population history in the Canary Islands blue tit subspecies complex.

    PubMed

    Hansson, Bengt; Ljungqvist, Marcus; Illera, Juan-Carlos; Kvist, Laura

    2014-01-01

    Evolutionary molecular studies of island radiations may lead to insights in the role of vicariance, founder events, population size and drift in the processes of population differentiation. We evaluate the degree of population genetic differentiation and fixation of the Canary Islands blue tit subspecies complex using microsatellite markers and aim to get insights in the population history using coalescence based methods. The Canary Island populations were strongly genetically differentiated and had reduced diversity with pronounced fixation including many private alleles. In population structure models, the relationship between the central island populations (La Gomera, Tenerife and Gran Canaria) and El Hierro was difficult to disentangle whereas the two European populations showed consistent clustering, the two eastern islands (Fuerteventura and Lanzarote) and Morocco weak clustering, and La Palma a consistent unique lineage. Coalescence based models suggested that the European mainland forms an outgroup to the Afrocanarian population, a split between the western island group (La Palma and El Hierro) and the central island group, and recent splits between the three central islands, and between the two eastern islands and Morocco, respectively. It is clear that strong genetic drift and low level of concurrent gene flow among populations have shaped complex allelic patterns of fixation and skewed frequencies over the archipelago. However, understanding the population history remains challenging; in particular, the pattern of extreme divergence with low genetic diversity and yet unique genetic material in the Canary Island system requires an explanation. A potential scenario is population contractions of a historically large and genetically variable Afrocanarian population, with vicariance and drift following in the wake. The suggestion from sequence-based analyses of a Pleistocene extinction of a substantial part of North Africa and a Pleistocene/Holocene eastward

  5. The severe thunderstorm of 4 October 2007 in Mallorca: an observational study

    NASA Astrophysics Data System (ADS)

    Ramis, C.; Romero, R.; Homar, V.

    2009-07-01

    During the afternoon of 4 October 2007, a thunderstorm swept across the Island of Mallorca from southwest to northeast. Strong straight-line winds (up to 30 m/s) and heavy rain (rates up to 100 mm/h) were registered accompanying the storm. Tornadoes with an estimated intensity of F2-F3 developed nearby the city of Palma, severely affecting industrial installations. One person was killed by the impact of heavy debris while more than 10 million € in damages were attributed to the event in the industrial area only. The observed evolution of temperature, humidity, wind and pressure, as well as the sequence of radar images, reveal that a squall line was initially organized over the sea and then moved north-eastwards at an estimated speed of around 80 km/h. This paper presents an analysis of the event from an observational point of view. The aim of the study is to contribute to the characterization of these rare events in the Western Mediterranean by analyzing the observational information available for this particular extreme event. The diagnosis is aimed at helping forecasters to identify this kind of organized deep convective events and being able to issue timely warnings. The synoptic scenario shows warm and moist advection at low levels over Balearics and an upper-level trough over mainland Spain. This situation is known to be prone to deep convection in Mediterranean Spain in autumn. Radiosonde ascents from Murcia and Palma show convective instability at mid levels that can conduce to develop convection if appropriate ascents occur. A plausible lifting mechanism to trigger convection is attributed to large amplitude gravity waves, registered as short-period pressure oscillations by surface barographs.

  6. The Instituto de Astrofísica de Canarias: 30 years of Research and Communication in Astronomy.

    NASA Astrophysics Data System (ADS)

    Del Puerto, Carmen; Rodriguez, Nayra; Rosenberg, Alfred; Beckman, John Etienne

    2015-08-01

    1985 was a year of inauguration for the Instituto de Astrofísica de Canarias (IAC). In that year its two observatories, the Observatorio del Roque de los Muchachos, on the island of La Palma, (where its 10.4m optical-NIR telescope vies with the world´s major instruments), and the Observatorio del Teide, on the island of Tenerife, as well as its headquarters in La Laguna, Tenerife, were all inaugurated. This young institution has rapidly become the leading research centre for astronomy in Spain and achieved research standards at a European and world level. The 30th anniversary celebrations this year give an opportunity to maximize its already very active outreach programmes. In February two shows, featuring IAC researchers, and with astronomical themes, were shown in the main theatre of the city of La Laguna, and during the year further entertainment, collaborating with Canarian musicians and artists, is planned. Two exhibitions have been designed combining the anniversary with celebrations of the International Year of Light: “Listen to the Universe”, in Tenerife, and “Thirty Journeys around the Sun”, in La Palma, which will be open to the public for most of the year. A new outreach magazine “Parallaxes” will be launched by the IAC, in both paper and digital editions, and will complement the current blog, and news websites of the institute, as well as its communications on Facebook and Twitter. Among the activities being organized in Tenerife will be the formal naming of traffic circles with names of the telescopes at the Observatories. In conjunction with the municipal wine cellars of the local city of Tegueste a new Canarian wine produced by innovative methods and with an astronomical motif on its label, is to be launched during the year. All of these activities are in addition to the somewhat more routine productions of videos on the research lines of the IAC, including exoplanets, solar stellar, and interstellar physics, galaxies, and cosmology.

  7. Short-term variability on the surface of (1) Ceres⋆. A changing amount of water ice?

    NASA Astrophysics Data System (ADS)

    Perna, D.; Kaňuchová, Z.; Ieva, S.; Fornasier, S.; Barucci, M. A.; Lantz, C.; Dotto, E.; Strazzulla, G.

    2015-03-01

    Context. The dwarf planet (1) Ceres - next target of the NASA Dawn mission - is the largest body in the asteroid main belt. Although several observations of this body have been performed so far, the presence of surface water ice is still questioned. Aims: Our goal is to better understand the surface composition of Ceres and to constrain the presence of exposed water ice. Methods: We acquired new visible and near-infrared spectra at the Telescopio Nazionale Galileo (La Palma, Spain), and reanalyzed literature spectra in the 3-μm region. Results: We obtained the first rotationally resolved spectroscopic observations of Ceres at visible wavelengths. Visible spectra taken one month apart at almost the same planetocentric coordinates show a significant slope variation (up to 3%/103Å). A faint absorption centered at 0.67 μm, possibly due to aqueous alteration, is detected in a subset of our spectra. The various explanations in the literature for the 3.06-μm feature can be interpreted as due to a variable amount of surface water ice at different epochs. Conclusions: The remarkable short-term temporal variability of the visible spectral slope and the changing shape of the 3.06-μm band can be hints of different amounts of water ice exposed on the surface of Ceres. This would agree with the recent detection by the Herschel Space Observatory of localized and transient sources of water vapor over this dwarf planet. Based on observations made with the Italian Telescopio Nazionale Galileo (TNG) operated on the island of La Palma by the Fundación Galileo Galilei of the INAF (Istituto Nazionale di Astrofisica) at the Spanish Observatorio del Roque de los Muchachos of the Instituto de Astrofisica de Canarias.Appendices are available in electronic form at http://www.aanda.org

  8. Composition and evolution of submarine volcanic rocks from the central and western Canary Islands

    NASA Astrophysics Data System (ADS)

    Abratis, M.; Schmincke, H.-U.; Hansteen, T. H.

    2002-08-01

    Submarine volcanic rocks dredged during RV Meteor cruise M43-1 comprise alkali basalts, basanites, nephelinites and their differentiates representing both basement-shield and young post-shield volcanics of Gran Canaria, Tenerife, La Palma and El Hierro. The primitive lavas vary widely in trace element composition (e.g., Zr/Y=6.6-11.7, (La/Sm)N=2.3-5.4, and Ba/Yb=71-311), and they are characterized by steep, rare-earth element patterns with mean (La/Yb)N=16, and by pronounced, positive primitive mantle-normalized Nb and Ta and negative K anomalies similar to HIMU-type basalts. Rocks from the submarine flanks west and north of Gran Canaria are isotopically and geochemically identical to rocks of the subaerial Miocene shield stage, but they are distinct from rocks of the post-shield stages (Zr/Nb=6.3-8.9, 87Sr/86Sr=0.70327-0.70332, 143Nd/144Nd=0.51289-0.51293, 206Pb/204Pb=19.55-19.88). Most rocks dredged from the submarine flanks of Tenerife are isotopically and geochemically similar to rocks of the adjacent subaerial shield remnants, but a few resemble rocks of the subaerial post-shield stages (total range in Zr/Nb=4.6-6.1, 87Sr/86Sr=0.70300-0.70329, 143Nd/144Nd=0.51281-0.51292, 206Pb/204Pb=19.51-19.96). Rocks from the southern submarine ridge of La Palma cover the entire compositional range of the subaerial rocks of that ridge. Additionally, they comprise a high Zr/Nb group which resembles rocks of the ca. 1-Ma-old Taburiente shield of northern La Palma (total range in Zr/Nb=3.0-6.4, 87Sr/86Sr=0.70297-0.70314, 143Nd/144Nd=0.51288-0.51296, 206Pb/204Pb=19.21-19.79). Rocks from the southern submarine ridge of El Hierro compositionally resemble subaerial rocks of the island (Zr/Nb=4.1-6.2, 87Sr/86Sr=0.70296-0.70314, 143Nd/144Nd=0.51291-0.51297, 206Pb/204Pb=19.25-19.91). The degree of melting in the subcanarian mantle is interpreted to decrease from east to west across the archipelago whereas the proportion of depleted mantle component in the melting anomaly increases

  9. The galaxy population of Abell 1367: photometric and spectroscopic data

    NASA Astrophysics Data System (ADS)

    Kriwattanawong, W.; Moss, C.; James, P. A.; Carter, D.

    2011-03-01

    Aims: Photometric and spectroscopic observations of the galaxy population of the galaxy cluster Abell 1367 have been obtained, over a field of 34' × 90', covering the cluster centre out to a radius of ~2.2 Mpc. Optical broad- and narrow-band imaging was used to determine galaxy luminosities, diameters and morphologies, and to study current star formation activity of a sample of cluster galaxies. Near-infrared imaging was obtained to estimate integrated stellar masses, and to aid the determination of mean stellar ages and metallicities for the future investigation of the star formation history of those galaxies. Optical spectroscopic observations were also taken, to confirm cluster membership of galaxies in the sample through their recession velocities. Methods.U, B and R broad-band and Hα narrow-band imaging observations were carried out using the Wide Field Camera (WFC) on the 2.5 m Isaac Newton Telescope on La Palma, covering the field described above. J and K near-infrared imaging was obtained using the Wide Field Camera (WFCAM) on the 3.8 m UK Infrared Telescope on Mauna Kea, covering a somewhat smaller field of 0.75 square degrees on the cluster centre. The spectroscopic observations were carried out using a multifibre spectrograph (WYFFOS) on the 4.2 m William Herschel Telecope on La Palma, over the same field as the optical imaging observations. Results: Our photometric data give optical and near-infrared isophotal magnitudes for 303 galaxies in our survey regions, down to stated diameter and B-band magnitude limits, determined within R24 isophotal diameters. Our spectroscopic data of 328 objects provide 84 galaxies with detections of emission and/or absorption lines. Combining these with published spectroscopic data gives 126 galaxies within our sample for which recession velocities are known. Of these, 72 galaxies are confirmed as cluster members of Abell 1367, 11 of which are identified in this study and 61 are reported in the literature. Hα equivalent

  10. A high-resolution spectroscopic survey of late-type stars: chromospheric activity, rotation, kinematics, and age

    NASA Astrophysics Data System (ADS)

    López-Santiago, J.; Montes, D.; Gálvez-Ortiz, M. C.; Crespo-Chacón, I.; Martínez-Arnáiz, R. M.; Fernández-Figueroa, M. J.; de Castro, E.; Cornide, M.

    2010-05-01

    National Commission for Astronomy; the Nordic Optical Telescope (NOT), operated on the island of La Palma jointly by Denmark, Finland, Iceland, Norway and Sweden, in the Spanish Observatorio del Roque de Los Muchachos of the Instituto de Astrofísica de Canarias; the Isaac Newton Telescope (INT) operated on the island of La Palma by the Isaac Newton Group in the Spanish Observatorio del Roque de Los Muchachos of the Instituto de Astrofísica de Canarias; with the Italian Telescopio Nazionale Galileo (TNG) operated on the island of La Palma by the Centro Galileo Galilei of the INAF (Istituto Nazionale di Astrofisica) at the Spanish Observatorio del Roque de Los Muchachos of the Instituto de Astrofísica de Canarias; and with the Hobby-Eberly Telescope (HET) operated by McDonald Observatory on behalf of The University of Texas at Austin, the Pennsylvania State University, Stanford University, Ludwig-Maximilians-Universität München, and Georg-August-Universität Göttingen. This research has made use of the SIMBAD database and VizieR catalog access tool, operated at CDS, Strasbourg, France.Tables A.1-A.4 and reduced spectra are also available in electronic form at the CDS via anonymous ftp to cdsarc.u-strasbg.fr (130.79.128.5) or via http://cdsweb.u-strasbg.fr/cgi-bin/qcat?J/A+A/514/A97

  11. Ionospheric Slab Thickness at the Equatorial Anomaly Region after the Deep Solar Minimum of Cycle 23/24

    NASA Astrophysics Data System (ADS)

    Duarte Silva, M. H.; Muella, M.; Silva, L. C. C.; de Abreu, A. J.; Fagundes, P. R.

    2014-12-01

    This paper reports the first results of equivalent ionospheric slab thickness estimated in the Brazilian longitudinal sector. The ionospheric slab thickness is a measure of the shape of the ionospheric profile and can be obtained from the ratio of total electron content (TEC) to the F-region peak electron density (NmF2). In this study the ionospheric slab thickness was obtained during one year of extremely low solar activity (March 2009 to February 2010). The period analyzed were separated in three seasonal groups: equinoxes, June solstice (winter) and December solstice (summer) months. The ionospheric slab thickness was studied at two stations located around the southern crest of the Equatorial Ionization Anomaly (EIA). One station located in the inner edge of the anomaly region, named Palmas (10.12º S, 48.21º O, 7.73º S dip lat), and another station located under the crest of the anomaly, situated at São José dos Campos (23.07º S, 45.52º O, 19.61º S dip lat). The TEC data have been obtained from dual-frequency GPS receivers and the NmF2 data were calculated from the f0F2 parameter scaled from ionograms recorded by simultaneous measurements of digital ionosondes. The diurnal, seasonal and latitudinal variations of the ionospheric slab thickness were then analyzed. The minimum values of TEC and NmF2 were observed in both stations during the early morning, and the maximum values during afternoon hours. During the summer and equinoctial periods the slab thickness reached the higher values compared to those observed during the winter solstice months. The nearly equatorial site of Palmas showed values of daytime slab thickness larger than those observed at the low latitude station of São José dos Campos, except during the June solstice months. At São José dos Campos, a pronounced pre-dusk increase in the equivalent slab thickness was observed during the winter solstice months. From the calculated slab thickness we also inferred the atmospheric neutral

  12. Ionospheric slab thickness at the equatorial anomaly region after the deep solar minimum of cycle 23/24

    NASA Astrophysics Data System (ADS)

    Duarte-Silva, Marcelo H.; Muella, Marcio T. A. H.; Silva, Lidianne C. C.; de Abreu, Alessandro J.; Fagundes, Paulo R.

    2015-11-01

    The ionospheric slab thickness is a measure of the shape of the ionospheric profile and can be obtained from the ratio of total electron content (TEC) to the F-region peak electron density (NmF2). In this study the ionospheric slab thickness was obtained during one year of extremely low solar activity (from March 2009 to February 2010). The period analyzed were separated in three seasonal groups: equinoxes, June solstice (winter) and December solstice (summer) months. The ionospheric slab thickness was studied at two stations located around the southern crest of the equatorial ionization anomaly (EIA). One station located in the inner edge of the anomaly region, named Palmas (10.12° S, 48.21° O, 7.73° S dip lat), and another station located under the southern crest of the anomaly, situated at São José dos Campos (23.07° S, 45.52° O, 19.61° S dip lat). The TEC data have been obtained from dual-frequency Global Navigation Satellite System (GNSS) receivers and the NmF2 data were calculated from the foF2 parameter scaled from ionograms recorded by simultaneous measurements of digital ionosondes. The diurnal and seasonal variations of the ionospheric slab thickness at the EIA region were then analyzed. The minimum values of TEC and NmF2 were observed in both stations during the early morning, and the maximum values during afternoon hours. During the summer and equinoctial periods the slab thickness reached their highest values. The nearly equatorial site of Palmas showed values of daytime slab thickness larger than those observed at the low latitude station of São José dos Campos, except during the June solstice months. At São José dos Campos, a pronounced pre-dusk increase in the equivalent slab thickness was observed during the winter solstice months. The atmospheric neutral temperature (Tn) was also estimated from the correlation analysis between the MSIS modeled Tn and the calculated ionospheric slab thickness over the two observations sites. Other

  13. Ionospheric Slab Thickness in the East Sector of South-America During One year of Low Solar Activity

    NASA Astrophysics Data System (ADS)

    Silva, Marcelo Henrique Duarte; Muella, Marcio; Silva, Lidianne C. C.; De Abreu, Alessandro

    This paper reports the first results of equivalent ionospheric slab thickness estimated in the Brazilian longitudinal sector. The ionospheric slab thickness is a measure of the shape of the ionospheric profile and can be obtained from the ratio of the total electron content (TEC) to the F-region peak electron density (NmF2). The ionospheric slab thickness was studied during one year of low solar activity (from March 2009 to February 2010). The period analyzed were separated in three seasonal groups; Equinoxes, June solstice (winter) and December solstice (summer) months. The ionospheric slab thickness was studied at the equatorial station of Palmas (10.12 S, 48.21 W, 7.73 S dip lat) and in the low latitude station of Sao Jose dos Campos (23.07 S, 45.52 W, 19.61 S dip lat). The TEC data have been obtained from dual-frequency GPS receivers and the NmF2 data were calculated from the foF2 parameter scaled from ionograms recorded by simultaneous measurements of digital ionosondes. The minimum values of TEC and NmF2 were observed in both stations during the early morning and the maximum values during afternoon hours. The diurnal, seasonal and latitudinal variations of the ionopheric slab thickness were then analyzed. The thickness of the ionosphere increased during daytime if compared to the nighttime values. During the summer and the equinoctial periods the slab thickness reached the higher values if compared to those observed during the winter solstice months. The equatorial site of Palmas showed values of daytime slab thickness larger than those observed at the low-latitude station of Sao Jose dos Campos, except during the June solstice months. At Sao Jose dos Campos, a pronounced pre-dusk increase in the equivalent slab thickness is observed during the winter solstice months. From the calculated slab thickness we also estimated the atmospheric neutral temperature (Tn) over both stations. Other relevant aspects of the ionospheric slab thickness’ behavior will be

  14. The high-redshift gamma-ray burst GRB 140515A. A comprehensive X-ray and optical study

    NASA Astrophysics Data System (ADS)

    Melandri, A.; Bernardini, M. G.; D'Avanzo, P.; Sánchez-Ramírez, R.; Nappo, F.; Nava, L.; Japelj, J.; de Ugarte Postigo, A.; Oates, S.; Campana, S.; Covino, S.; D'Elia, V.; Ghirlanda, G.; Gafton, E.; Ghisellini, G.; Gnedin, N.; Goldoni, P.; Gorosabel, J.; Libbrecht, T.; Malesani, D.; Salvaterra, R.; Thöne, C. C.; Vergani, S. D.; Xu, D.; Tagliaferri, G.

    2015-09-01

    High-redshift gamma-ray bursts (GRBs) offer several advantages when studying the distant Universe, providing unique information about the structure and properties of the galaxies in which they exploded. Spectroscopic identification with large ground-based telescopes has improved our knowledge of this kind of distant events. We present the multi-wavelength analysis of the high-zSwift GRB GRB 140515A (z = 6.327). The best estimate of the neutral hydrogen fraction of the intergalactic medium towards the burst is xHI ≤ 0.002. The spectral absorption lines detected for this event are the weakest lines ever observed in GRB afterglows, suggesting that GRB 140515A exploded in a very low-density environment. Its circum-burst medium is characterised by an average extinction (AV ~ 0.1) that seems to be typical of z ≥ 6 events. The observed multi-band light curves are explained either with a very hard injected spectrum (p = 1.7) or with a multi-component emission (p = 2.1). In the second case a long-lasting central engine activity is needed in order to explain the late time X-ray emission. The possible origin of GRB 140515A in a Pop III (or in a Pop II star with a local environment enriched by Pop III) massive star is unlikely. Based on observations collected at the European Southern Observatory, ESO, the VLT/Kueyen telescope, Paranal, Chile (proposal code: 093.A-0069), on observations made with the Nordic Optical Telescope, operated by the Nordic Optical Telescope Scientific Association at the Observatorio del Roque de los Muchachos, La Palma, Spain, of the Instituto de Astrofísica de Canarias (programme 49-008), and on observations made with the Italian 3.6-m Telescopio Nazionale Galileo (TNG), operated by the Fundación Galileo Galilei of the INAF (Instituto Nazionale di Astrofisica) at the Spanish Observatorio del Roque de los Muchachos, La Palma, Spain, of the Instituto de Astrofísica de Canarias (programme A26TAC_63).Appendix A is available in electronic form at

  15. Lucky Imaging Adaptive Optics of the brown dwarf binary GJ569Bab

    NASA Astrophysics Data System (ADS)

    Femenía, B.; Rebolo, R.; Pérez-Prieto, J. A.; Hildebrandt, S. R.; Labadie, L.; Pérez-Garrido, A.; Béjar, V. J. S.; Díaz-Sánchez, A.; Villó, I.; Oscoz, A.; López, R.; Rodríguez, L. F.; Piqueras, J.

    2011-05-01

    The potential of combining Adaptive Optics (AO) and Lucky Imaging (LI) to achieve high-precision astrometry and differential photometry in the optical is investigated by conducting observations of the close 0.1 arcsec brown dwarf binary GJ569Bab. We took 50 000 I-band images with our LI instrument FastCam attached to NAOMI, the 4.2-m William Herschel Telescope (WHT) AO facility. In order to extract the most of the astrometry and photometry of the GJ569Bab system we have resorted to a PSF fitting technique using the primary star GJ569A as a suitable PSF reference which exhibits an I-band magnitude of 7.78 ± 0.03. The AO+LI observations at WHT were able to resolve the binary system GJ569Bab located at 4.92 ± 0.05 arcsec from GJ569A. We measure a separation of 98.4 ± 1.1 mas and I-band magnitudes of 13.86 ± 0.03 and 14.48 ± 0.03 and I-J colours of 2.72 ± 0.08 and 2.83 ± 0.08 for the Ba and Bb components, respectively. Our study rules out the presence of any other companion to GJ569A down to magnitude I˜ 17 at distances larger than 1 arcsec. The I-J colours measured are consistent with M8.5-M9 spectral types for the Ba and Bb components. The available dynamical, photometric and spectroscopic data are consistent with a binary system with Ba being slightly (10-20 per cent) more massive than Bb. We obtain new orbital parameters which are in good agreement with those in the literature. Based on service observations made with the 4.2-m William Herschel Telescope (WHT) operated on the island of La Palma by the Isaac Newton Group and on observations made with the Nordic Optical Telescope (NOT), operated on the island of La Palma jointly by Denmark, Finland, Iceland, Norway and Sweden, in the Spanish Observatorio del Roque de los Muchachos of the Instituto de Astrofísica de Canarias.

  16. Absolute dimensions of eclipsing binaries. XXIX. The Am-type systems SW Canis Majoris and HW Canis Majoris

    NASA Astrophysics Data System (ADS)

    Torres, G.; Clausen, J. V.; Bruntt, H.; Claret, A.; Andersen, J.; Nordström, B.; Stefanik, R. P.; Latham, D. W.

    2012-01-01

    Context. Accurate physical properties of eclipsing stars provide important constraints on models of stellar structure and evolution, especially when combined with spectroscopic information on their chemical composition. Empirical calibrations of the data also lead to accurate mass and radius estimates for exoplanet host stars. Finally, accurate data for unusual stellar subtypes, such as Am stars, also help to unravel the cause(s) of their peculiarities. Aims: We aim to determine the masses, radii, effective temperatures, detailed chemical composition and rotational speeds for the Am-type eclipsing binaries SW CMa (A4-5m) and HW CMa (A6m) and compare them with similar normal stars. Methods: Accurate radial velocities from the Digital Speedometers of the Harvard-Smithsonian Center for Astrophysics were combined with previously published uvby photometry to determine precise physical parameters for the four stars. A detailed abundance analysis was performed from high-resolution spectra obtained with the Nordic Optical Telescope (La Palma). Results: We find the masses of the (relatively evolved) stars in SW CMa to be 2.10 and 2.24 M⊙, with radii of 2.50 and 3.01 R⊙, while the (essentially zero-age) stars in HW CMa have masses of 1.72 and 1.78 M⊙, radii of 1.64 and 1.66 R⊙ - all with errors well below 2%. Detailed atmospheric abundances for one or both components were determined for 14 elements in SW CMa ([Fe/H] = +0.49/+0.61 dex) and 16 in HW CMa ([Fe/H] = +0.33/+0.32 dex); both abundance patterns are characteristic of metallic-line stars. Both systems are well fit by current stellar evolution models for assumed bulk abundances of [Fe/H] = +0.05 and +0.23, respectively ([α/Fe] = 0.0), and ages of ~700 Myr and 160 Myr. Based on observations carried out with the Nordic Optical Telescope (NOT) at La Palma, the 50 cm Strömgren Automatic Telescope (SAT) at ESO, La Silla, the 1.5 m Wyeth reflector at the Oak Ridge Observatory, Harvard, Massachusetts, USA, and the 1

  17. Tracking Advanced Planetary Systems (TAPAS) with HARPS-N. II. Super Li-rich giant HD 107028

    NASA Astrophysics Data System (ADS)

    Adamów, M.; Niedzielski, A.; Villaver, E.; Wolszczan, A.; Kowalik, K.; Nowak, G.; Adamczyk, M.; Deka-Szymankiewicz, B.

    2015-09-01

    the island of La Palma by the Fundación Galileo Galilei of the INAF (Istituto Nazionale di Astrofisica) at the Spanish Observatorio del Roque de los Muchachos of the Instituto de Astrofísica de Canarias.Based on observations made with the Mercator Telescope, operated on the island of La Palma by the Flemish Community, at the Spanish Observatorio del Roque de los Muchachos of the Instituto de Astrofísica de Canarias.

  18. K-Ar geochronology of basement rocks on the northern flank of the Huancabama deflection, Ecuador

    USGS Publications Warehouse

    Feininger, Tomas; Silberman, M.L.

    1982-01-01

    The Huancabamba deflection, a major Andean orocline located at the Ecuador-Peru border, constitutes an important geologic boundary on the Pacific coast of South America. Crust to the north of the deflection is oceanic and the basement is composed of basic igneous rocks of Cretaceous age, whereas crust to the south is continental and felsic rocks of Precambrian to Cretaceous age make up the basement. The northern flank of the Huancabamba Deflection in El Oro Province, Ecuador, is underlain by Precambrian polymetamorphic basic rocks of the Piedras Group; shale, siltstone, sandstone, and their metamorphosed equivalents in the Tahuin Group (in part of Devonian age); concordant syntectonic granitic rocks; quartz diorite and alaskite of the Maroabeli pluton; a protrusion of serpentinized harzburgite that contains a large inclusion of blueschist-facies metamorphic rocks, the Raspas Formation, and metamorphic rocks north of the La Palma fault. Biotite from gneiss of the Tahuin Group yields a Late Triassic K-Ar age (210 ? 8 m.y.). This is interpreted as an uplift age and is consistent with a regional metamorphism of Paleozoic age. A nearby sample from the Piedras Group that yielded a hornblende K-Ar age of 196 ? 8 m.y. was affected by the same metamorphic event. Biotite from quartz diorite of the mesozonal Maroabeli pluton yields a Late Triassic age (214 ? 6 m.y.) which is interpreted as an uplift age which may be only slightly younger than the age of magmatic crystallization. Emplacement of the pluton may postdate regional metamorphism of the Tahuin Group. Phengite from politic schist of the Raspas Formation yields an Early Cretaceous K-Ar age (132 ? 5 m.y.). This age is believed to date the isostatic rise of the encasing serpentinized harzburgite as movement along a subjacent subduction zone ceased, and it is synchronous with the age of the youngest lavas of a coeval volcanic arc in eastern Ecuador. A Late Cretaceous K-Ar age (74.4 ? 1.1 m.y.) from hornblende in

  19. A New Coherent Science Content Storyline Astronomy Course for Pre-Service Teachers at Penn State

    NASA Astrophysics Data System (ADS)

    Palma, Christopher; Plummer, Julia; Earth and Space Science Partnership

    2016-01-01

    The Earth and Space Science Partnership (ESSP) is a collaboration among Penn State scientists, science educators and seven school districts across Pennsylvania. One of the ESSP goals has been to provide pre-service teachers with new or improved science course offerings at Penn State in the Earth and Space Science domains. In particular, we aim to provide students with opportunities to learn astronomy content knowledge through teaching methods that engage them in investigations where they experience the practices used by astronomers. We have designed a new course that builds on our research into students' ideas about Solar System astronomy (Plummer et al. 2015) and the curriculum our team created for a professional development workshop for in-service teachers (Palma et al. 2013) with this same theme. The course was offered for the first time in the spring 2015 semester. We designed the course using a coherent science content storyline approach (see, e.g., Palma et al. 2014), which requires all of the student investigations to build towards a big idea in science; in this case, we chose the model for formation of our Solar System. The course led pre-service teachers through a series of investigations that model the type of instruction we hope they will adopt in their own classrooms. They were presented with a series of research questions that all tie in to the big idea of Solar System formation, and they were responsible for collecting and interpreting their own data to draw evidence-based conclusions about one aspect of this model. Students in the course were assessed on their astronomy content knowledge, but also on their ability to construct arguments using scientific reasoning to answer astronomy questions. In this poster, we will present descriptions of the investigations, the assessments used, and our preliminary results about how the course led this group of pre-service teachers to improved understanding of astronomy content and the practices astronomers use in

  20. Silicon Isotope Geochemistry of Ocean Island Basalts: Mantle Heterogeneities and Contribution of Recycled Oceanic Crust and Lithosphere

    NASA Astrophysics Data System (ADS)

    Pringle, E. A.; Moynier, F.; Savage, P. S.; Jackson, M. G.; Moreira, M. A.; Day, J. M.

    2015-12-01

    The study of Silicon (Si) isotopes in Ocean Island Basalts (OIB) has the potential to elucidate between possible heterogeneities in the mantle. Relatively large (~several per mil per atomic mass unit) Si isotope fractionation occurs in low-temperature environments during biochemical and geochemical precipitation of dissolved Si, where the precipitate is preferentially enriched in the lighter isotopes [1]. In contrast, only a limited range (~tenths of a per mil) of Si isotope fractionation has been observed in high-temperature igneous processes [2]. Therefore, Si isotopes may be useful as tracers for the presence of crustal material (derived from low-temperature surface processes) in OIB source regions in a manner similar to more conventional stable isotope systems, such as O. Here we present the first comprehensive set of high-precision Si isotope data obtained by MC-ICP-MS for a diverse suite of OIBs, including new data for the Canary Islands. Samples represent the Pacific, Atlantic, and Indian Ocean basins and include representative end-members for the EM-1, EM-2, and HIMU mantle components. Average δ30Si values for OIBs representing the EM-1 (-0.32 ± 0.06‰, 2 sd), EM-2 (-0.30 ± 0.01‰, 2 sd), and HIMU (-0.34 ± 0.09‰, 2 sd) mantle components are all in general agreement with previous estimates for the δ30Si value of Bulk Silicate Earth [3]. However, small systematic variations are present; HIMU (Mangaia, Cape Verde, La Palma) and Iceland OIBs are enriched in the lighter isotopes of Si (δ30Si values lower than MORB). Further, the difference in Si isotope composition between La Palma and El Heirro (Canary Islands) has previously been observed for O isotopes [4], suggesting a relationship between the Si and O isotope mantle systematics. The Si isotope variations among OIBs may be explained by the sampling of a primitive mantle reservoir enriched in the light isotopes of Si, as suggested by [5], but most likely reflects the incorporation of recycled

  1. SN 2011A: A Low-luminosity Interacting Transient with a Double Plateau and Strong Sodium Absorption

    NASA Astrophysics Data System (ADS)

    de Jaeger, T.; Anderson, J. P.; Pignata, G.; Hamuy, M.; Kankare, E.; Stritzinger, M. D.; Benetti, S.; Bufano, F.; Elias-Rosa, N.; Folatelli, G.; Förster, F.; González-Gaitán, S.; Gutiérrez, C. P.; Inserra, C.; Kotak, R.; Lira, P.; Morrell, N.; Taddia, F.; Tomasella, L.

    2015-07-01

    We present optical photometry and spectroscopy of the optical transient SN 2011A. Our data span 140 days after discovery including {BVRI} u\\prime g\\prime r\\prime i\\prime z\\prime photometry and 11 epochs of optical spectroscopy. Originally classified as a type IIn supernova (SN IIn) due to the presence of narrow Hα emission, this object shows exceptional characteristics. First, the light curve shows a double plateau, a property only observed before in the impostor SN 1997bs. Second, SN 2011A has a very low luminosity ({M}V=-15.72), placing it between normal luminous SNe IIn and SN impostors. Third, SN 2011A shows low velocity and high equivalent width absorption close to the sodium doublet, which increases with time and is most likely of circumstellar origin. This evolution is also accompanied by a change in line profile; when the absorption becomes stronger, a P Cygni profile appears. We discuss SN 2011A in the context of interacting SNe IIn and SN impostors, which appears to confirm the uniqueness of this transient. While we favor an impostor origin for SN 2011A, we highlight the difficulty in differentiating between terminal and non-terminal interacting transients. This paper includes data obtained with the 6.5 m Magellan Telescopes and du Pont telescope; the Gemini-North Telescope, Mauna Kea, USA (Gemini Program GN-2010B-Q67, PI: Stritzinger); the PROMPT telescopes at Cerro Tololo Inter-American Observatory in Chile; with the Liverpool Telescope operated on the island of La Palma by Liverpool John Moores University in the Spanish Observatorio del Roque de los Muchachos of the Instituto de Astrofisica de Canarias with financial support from the UK Science and Technology Facilities Council; based on observations made with the Nordic Optical Telescope, operated by the Nordic Optical Telescope Scientific Association at the Observatorio del Roque de los Muchachos, La Palma, Spain, of the Instituto de Astrofisica de Canarias; the NTT from ESO Science Archive

  2. PM10 source apportionment applying PMF and chemical tracer analysis to ship-borne measurements in the Western Mediterranean

    NASA Astrophysics Data System (ADS)

    Bove, M. C.; Brotto, P.; Calzolai, G.; Cassola, F.; Cavalli, F.; Fermo, P.; Hjorth, J.; Massabò, D.; Nava, S.; Piazzalunga, A.; Schembari, C.; Prati, P.

    2016-01-01

    A PM10 sampling campaign was carried out on board the cruise ship Costa Concordia during three weeks in summer 2011. The ship route was Civitavecchia-Savona-Barcelona-Palma de Mallorca-Malta (Valletta)-Palermo-Civitavecchia. The PM10 composition was measured and utilized to identify and characterize the main PM10 sources along the ship route through receptor modelling, making use of the Positive Matrix Factorization (PMF) algorithm. A particular attention was given to the emissions related to heavy fuel oil combustion by ships, which is known to be also an important source of secondary sulphate aerosol. Five aerosol sources were resolved by the PMF analysis. The primary contribution of ship emissions to PM10 turned out to be (12 ± 4)%, while secondary ammonium sulphate contributed by (35 ± 5)%. Approximately, 60% of the total sulphate was identified as secondary aerosol while about 20% was attributed to heavy oil combustion in ship engines. The measured concentrations of methanesulphonic acid (MSA) indicated a relevant contribution to the observed sulphate loading by biogenic sulphate, formed by the atmospheric oxidation of dimethyl sulphide (DMS) emitted by marine phytoplankton.

  3. Empirical seasonal forecasts of the NAO

    NASA Astrophysics Data System (ADS)

    Sanchezgomez, E.; Ortizbevia, M.

    2003-04-01

    We present here seasonal forecasts of the North Atlantic Oscillation (NAO) issued from ocean predictors with an empirical procedure. The Singular Values Decomposition (SVD) of the cross-correlation matrix between predictor and predictand fields at the lag used for the forecast lead is at the core of the empirical model. The main predictor field are sea surface temperature anomalies, although sea ice cover anomalies are also used. Forecasts are issued in probabilistic form. The model is an improvement over a previous version (1), where Sea Level Pressure Anomalies were first forecast, and the NAO Index built from this forecast field. Both correlation skill between forecast and observed field, and number of forecasts that hit the correct NAO sign, are used to assess the forecast performance , usually above those values found in the case of forecasts issued assuming persistence. For certain seasons and/or leads, values of the skill are above the .7 usefulness treshold. References (1) SanchezGomez, E. and Ortiz Bevia M., 2002, Estimacion de la evolucion pluviometrica de la Espana Seca atendiendo a diversos pronosticos empiricos de la NAO, in 'El Agua y el Clima', Publicaciones de la AEC, Serie A, N 3, pp 63-73, Palma de Mallorca, Spain

  4. Hα kinematics of S4G spiral galaxies - II. Data description and non-circular motions

    NASA Astrophysics Data System (ADS)

    Erroz-Ferrer, Santiago; Knapen, Johan H.; Leaman, Ryan; Cisternas, Mauricio; Font, Joan; Beckman, John E.; Sheth, Kartik; Muñoz-Mateos, Juan Carlos; Díaz-García, Simón; Bosma, Albert; Athanassoula, E.; Elmegreen, Bruce G.; Ho, Luis C.; Kim, Taehyun; Laurikainen, Eija; Martinez-Valpuesta, Inma; Meidt, Sharon E.; Salo, Heikki

    2015-07-01

    We present a kinematical study of 29 spiral galaxies included in the Spitzer Survey of Stellar Structure in Galaxies, using Hα Fabry-Perot (FP) data obtained with the Galaxy Hα Fabry-Perot System instrument at the William Herschel Telescope in La Palma, complemented with images in the R band and in Hα. The primary goal is to study the evolution and properties of the main structural components of galaxies through the kinematical analysis of the FP data, complemented with studies of morphology, star formation and mass distribution. In this paper we describe how the FP data have been obtained, processed and analysed. We present the resulting moment maps, rotation curves, velocity model maps and residual maps. Images are available in FITS format through the NASA/IPAC Extragalactic Database and the Centre de Données Stellaires. With these data products we study the non-circular motions, in particular those found along the bars and spiral arms. The data indicate that the amplitude of the non-circular motions created by the bar does not correlate with the bar strength indicators. The amplitude of those non-circular motions in the spiral arms does not correlate with either arm class or star formation rate along the spiral arms. This implies that the presence and the magnitude of the streaming motions in the arms is a local phenomenon.

  5. RoboNet-1.0: A Prototype Global Network of Large Robotic Telescopes

    NASA Astrophysics Data System (ADS)

    Bode, M. F.; Cardiff U. Collaboration; U. Hertfordshire Collaboration; U. Leicester Collaboration; St Andrews U. Collaboration; Queens U., Belfast Collaboration; Mullard Space Science Lab. Collaboration; U. Exeter Collaboration; U. Southampton Collaboration; U. Manchester Collaboration

    2004-12-01

    Involving a consortium of 10 UK universities, RoboNet-1.0 comprises the Liverpool Telescope (LT, La Palma), plus specially allocated time on the Faulkes Telescope North (FTN, Maui) and Faulkes Telescope South (FTS, Siding Spring, Australia). All three are essentially identical 2m telescopes equipped for both optical photometry and spectroscopy and operated from a common centre in Liverpool. The LT is primarily for research use whereas the FTs are mainly dedicated to education. Software developed by the eSTAR GRID project is being applied and enhanced to enable efficient and effective operation of the network. The primary scientific projects being addressed by RoboNet-1.0 are (a) rapid follow-up of Gamma Ray Burst sources detected by missions such as Swift, and (b) the detection of extra-solar planets via microlensing. Observations with the network began in August 2004. This is a pre-cursor project to the establishment of the full RoboNet global network of six dedicated telescopes which would greatly enhance work in several important branches of time domain astrophysics. Operation of the Liverpool Telescope and RoboNet-1.0 are funded by the UK Particle Physics and Astronomy Research Council. The Faulkes Telescopes are funded by the Dill Faulkes Educational Trust.

  6. A new investigation of hydration in the M-type asteroids

    NASA Astrophysics Data System (ADS)

    Landsman, Zoe A.; Campins, Humberto; Pinilla-Alonso, Noemí; Hanuš, Josef; Lorenzi, Vania

    2015-05-01

    We obtained 2-4 μm spectra of six M-type asteroids using the SpeX spectrograph at NASA's Infrared Telescope Facility. We find evidence for hydrated minerals on all six asteroids, including two that were previously thought to be dry. One of our targets, (216) Kleopatra, shows rotational variability in the depth of its 3-μm feature. We also studied three of these asteroids in the 0.8-2.4 μm range using the NICS instrument at the Telescopio Nazionale Galileo (TNG) in La Palma, Spain. The discovery of spectral signatures of hydrated minerals on so many M-types is difficult to reconcile with a highly thermally evolved composition. It has been suggested that the hydrated minerals could have been delivered to M-types via impacts with primitive objects, or that the M-types may actually have primitive compositions that are not represented in meteorite collections. Understanding the origin and type of hydration on these asteroids will help determine which of these interpretations is correct.

  7. Characterization of the Optical and X-ray Properties of the Northwestern Wisps in the Crab Nebula

    NASA Technical Reports Server (NTRS)

    Weisskopf, M. C.; Bucciantini, N.; Idec, W.; Nillson, K.; Schweizer, T.; Tennant, A. F.; Zanin, R.

    2013-01-01

    We have studied the wisps to the northwest of the Crab pulsar as part of a multi-wavelength campaign in the visible and in X-rays. Optical observations were obtained using the Nordic Optical Telescope in La Palma and X-ray observations were made with the Chandra X-ray Observatory. The observing campaign took place from October 2010 until September 2012. About once per year we observe wisps forming and peeling off from (or near) the region commonly associated with the termination shock of the pulsar wind. We find that the exact locations of the northwestern wisps in the optical and in X-rays are similar but not coincident, with X-ray wisps preferentially located closer to the pulsar. This suggests that the optical and X-ray wisps are not produced by the same particle distribution. It is also interesting to note that the optical and radio wisps are also separated from each other (Bietenholz et al. 2004). Our measurements and their implications are interpreted in terms of a Doppler-boosted ring model that has its origin in MHD modeling. While the Doppler boosting factors inferred from the X-ray wisps are consistent with current MHD simulations of PWNe, the optical boosting factors are not, and typically exceed values from MHD simulations by about a factor of 4.

  8. Characterization of the optical and X-ray properties of the north-western wisps in the Crab nebula

    NASA Astrophysics Data System (ADS)

    Schweizer, T.; Bucciantini, N.; Idec, W.; Nilsson, K.; Tennant, A.; Weisskopf, M. C.; Zanin, R.

    2013-08-01

    We have studied the wisps to the north-west of the Crab pulsar as part of a multiwavelength campaign in the visible and in X-rays. Optical observations were obtained using the Nordic Optical Telescope in La Palma and X-ray observations were made with the Chandra X-ray Observatory. The observing campaign took place from 2010 October until 2012 September. About once per year we observe wisps forming and peeling off from (or near) the region commonly associated with the termination shock of the pulsar wind. We find that the exact locations of the north-western wisps in the optical and in X-rays are similar but not coincident, with X-ray wisps preferentially located closer to the pulsar. This suggests that the optical and X-ray wisps are not produced by the same particle distribution. Our measurements and their implications are interpreted in terms of a Doppler-boosted ring model that has its origin in magnetohydrodynamic (MHD) modelling. While the Doppler boosting factors inferred from the X-ray wisps are consistent with current MHD simulations of pulsar wind nebulae, the optical boosting factors are not, and typically exceed values from MHD simulations by about a factor of 3.

  9. The European project CASAM for the protection of commercial airliners in flight

    NASA Astrophysics Data System (ADS)

    Vergnolle, Jean-François

    2007-10-01

    As part of mass transportation systems, commercial aircraft are a potential target for terrorists because they represent one of the best achievements of our society. As a result, an attack would have a large psychological impact on people and economic activity. Several European Commission-funded Research and Technology programs, such as SAFEE and PALMA, are dedicated to technologies and systems that will be implemented onboard aircraft in the near future to increase the security of commercial flights. One of these programs, CASAM, is focusing on a potential solution to reduce aircraft vulnerability against Man Portable Air Defense Systems (MANPADS) during takeoff, ascent and landing. A specific onboard jamming system will be developed, meeting stringent yet competitive requirements that deal with high reliability, low cost and minimal installation constraints. The overall objective of the CASAM Project1 is to design and validate a closed-loop, laser-based DIRCM (Directed IR Countermeasure) module for jamming fired missiles. It will comply with commercial air transportation constraints, including the normal air traffic control rules. For example, the following aspects will be considered: - Environmental friendliness for ground objects and inhabitants close to airports, aircraft safety (maintenance, handling and usage) and high efficiency against the recognized threats; - Upgradability for further and future disseminated threats - Adherence to commercial operation budgets and processes

  10. Time-Dependent Wave Packet Study of the H2 + CH3 → H + CH4 Reaction.

    PubMed

    Zhang, Zhaojun; Chen, Jun; Yang, Minghui; Zhang, Dong H

    2015-12-17

    The initial state selected time-dependent wave packet method has been developed to study the H2 + CH3 → H + CH4 reaction, by employing the seven- and eight-dimensional models proposed by Palma and Clary in which the nonreacting CH3 moiety is restricted in C3v symmetry. Total reaction probabilities and integral cross sections were calculated for the ground and a number of vibrationally excited initial states to investigate the effects of vibrational excitations of both reagents on the reaction. The eight-dimensional calculations showed that the CH stretching excitation does not have any important effect on the reaction and the seven-dimensional model with the CH bond length fixed works very well for the reaction. The excitation of H2 vibrations could enhance the reaction but is less effective than the translation in the low energy region. In contrast, the first umbrella excitation is very effective on reducing the reaction threshold. The calculated rate constants are found to be in good agreement with available experimental measurements and other theoretical results.

  11. The Ringo2 Optical Polarisation Catalogue of 13 High-Energy Blazars

    NASA Astrophysics Data System (ADS)

    Barres de Almeida, Ulisses; Jermak, Helen; Mundell, Carole; Lindfors, Elina; Nilsson, Kari; Steele, Iain

    2015-08-01

    We present the findings of the Ringo2 3-year survey of 13 blazars (3 FSRQs and 10 BL Lacs) with regular coverage and reasonably fast cadence of one to three observations a week. Ringo2 was installed on the Liverpool Robotic Telescope (LT) on the Canary Island of La Palma between 2009 and 2012 and monitored thirteen high-energy-emitting blazars in the northern sky. The objects selected as well as the observational strategy were tuned to maximise the synergies with high-energy X- to gamma-ray observations. Therefore this sample stands out as a well-sampled, long-term view of high-energy AGN jets in polarised optical light. Over half of the sources exhibited an increase in optical flux during this period and almost a quarter were observed in outburst. We compare the optical data to gamma (Fermi/LAT) and X-ray data during these periods of outburst. In this talk we present the data obtained for all sources over the lifetime of Ringo2 with additional optical data from the KVA telescope and the SkyCamZ wide-field camera (on the LT), we explore the relationship between the change in polarisation angle as a function of time (dEVPA/dMJD), flux and polarisation degree along with cross correlation comparisons of optical and high-energy flux.

  12. Study of Magnetic Structure in the Solar Photosphere and Chromosphere

    NASA Technical Reports Server (NTRS)

    Noyes, Robert W.; Avrett, Eugene; Nisenson, Peter; Uitenbroek, Han; vanBallegooijen, Adriaan

    1998-01-01

    This grant funded an observational and theoretical program to study the structure and dynamics of the solar photosphere and low chromosphere, and the spectral signatures that result. The overall goal is to learn about mechanisms that cause heating of the overlying atmosphere, and produce variability of solar emission in spectral regions important for astrophysics and space physics. The program exploited two new ground-based observational capabilities: one using the Swedish Solar Telescope on La Palma for very high angular resolution observations of the photospheric intensity field (granulation) and proxies of the magnetic field (G-band images); and the other using the Near Infrared Magnetograph at the McMath-Pierce Solar Facility to map the spatial variation and dynamic behavior of the solar temperature minimum region using infrared CO lines. We have interpreted these data using a variety of theoretical and modelling approaches, some developed especially for this project. Previous annual reports cover the work done up to 31 May 1997. This final report summarizes our work for the entire period, including the period of no-cost extension from 1 June 1997 through September 30 1997. In Section 2 we discuss observations and modelling of the photospheric flowfields and their consequences for heating of the overlying atmosphere, and in Section 3 we discuss imaging spectroscopy of the CO lines at 4.67 mu.

  13. Polarimeter with two ferroelectric liquid-crystal modulators attached to the Yunnan solar tower.

    PubMed

    Xu, Chenglin; Qu, Zhongquan; Zhang, Xiaoyu; Jin, Chunlan; Yan, Xiaoli

    2006-11-20

    A polarimeter to be mounted on the Yunnan solar tower is described. It features the ability to simultaneously measure the magnetic fields of the solar photosphere and chromosphere by analyzing the Stokes spectra of those magnetosensitive lines forming in the two regions with very high efficiency of polarization measurement. The polarimeter consists of two ferroelectric liquid crystals and one lambda/4 wave plate before a polarizing beam splitter. The achromatism of the design is emphasized to get the maximum combination efficiency over a spectral range from 5000 to 6000 A. For the used solar absorption lines MgI517.27, FeI525.06, FeI630.15, and FeI630.25 nm, the design gives theoretical efficiencies of polarization measurements, which are 0.999, 1.0, 0.943, and 0.943, respectively. A comparison with other reference polarimeters, such as the Synoptic Optical Long-term Investigation of the Sun, the Tenerife infrared polarimeter, and the La Palma Stokes Polarimeter, is carried out. PMID:17086251

  14. Spectrally Resolved Intensities of Ultra-Dense Hot Aluminum Plasmas

    SciTech Connect

    Gil, J. M.; Rodriguez, R.; Florido, R.; Rubiano, J. G.; Martel, P.; Minguez, E.; Sauvan, P.; Angelo, P.; Dalimier, E.; Schott, R.; Mancini, R.

    2008-10-22

    We present a first study of spectroscopic determination of electron temperature and density spatial profiles of aluminum K-shell line emission spectra from laser-shocked aluminum experiments performed at LULI. The radiation emitted by the aluminum plasma was dispersed with an ultra-high resolution spectrograph ({lambda}/{delta}{lambda}{approx_equal}6000). From the recorded films one can extract a set of time-integrated emission lineouts associated with the corresponding spatial region of the plasma. The observed spectra include the Ly{alpha}, He{beta}, He{gamma}, Ly{beta} and Ly{gamma} line emissions and their associated He- and Li-like satellites thus covering a photon energy range from 1700 eV to 2400 eV approximately. The data analysis rely on the ABAKO/RAPCAL computational package, which has been recently developed at the University of Las Palmas de Gran Canaria and takes into account non-equilibrium collisional-radiative atomic kinetics, Stark broadened line shapes and radiation transport calculations.

  15. A SAURON study of M32: measuring the intrinsic flattening and the central black hole mass

    NASA Astrophysics Data System (ADS)

    Verolme, E. K.; Cappellari, M.; Copin, Y.; van der Marel, R. P.; Bacon, R.; Bureau, M.; Davies, R. L.; Miller, B. M.; de Zeeuw, P. T.

    2002-09-01

    We present dynamical models of the nearby compact elliptical galaxy M32, using high-quality kinematic measurements, obtained with the integral-field spectrograph SAURON mounted on the William Herschel Telescope on La Palma. We also include STIS data obtained previously by Joseph et al. We find a best-fitting black hole mass of M•= (2.5 +/- 0.5) × 106 Msolar and a stellar I-band mass-to-light ratio of (1.85 +/- 0.15) Msolar/Lsolar. For the first time, we are also able to constrain the inclination along which M32 is observed to 70°+/- 5°. Assuming that M32 is indeed axisymmetric, the averaged observed flattening of 0.73 then corresponds to an intrinsic flattening of 0.68 +/- 0.03. These tight constraints are mainly caused by the use of integral-field data. We show this quantitatively by comparing with models that are constrained by multiple slits only. We show the phase-space distribution and intrinsic velocity structure of the best-fitting model and investigate the effect of regularization on the orbit distribution.

  16. Teleportation of entanglement over 143 km.

    PubMed

    Herbst, Thomas; Scheidl, Thomas; Fink, Matthias; Handsteiner, Johannes; Wittmann, Bernhard; Ursin, Rupert; Zeilinger, Anton

    2015-11-17

    As a direct consequence of the no-cloning theorem, the deterministic amplification as in classical communication is impossible for unknown quantum states. This calls for more advanced techniques in a future global quantum network, e.g., for cloud quantum computing. A unique solution is the teleportation of an entangled state, i.e., entanglement swapping, representing the central resource to relay entanglement between distant nodes. Together with entanglement purification and a quantum memory it constitutes a so-called quantum repeater. Since the aforementioned building blocks have been individually demonstrated in laboratory setups only, the applicability of the required technology in real-world scenarios remained to be proven. Here we present a free-space entanglement-swapping experiment between the Canary Islands of La Palma and Tenerife, verifying the presence of quantum entanglement between two previously independent photons separated by 143 km. We obtained an expectation value for the entanglement-witness operator, more than 6 SDs beyond the classical limit. By consecutive generation of the two required photon pairs and space-like separation of the relevant measurement events, we also showed the feasibility of the swapping protocol in a long-distance scenario, where the independence of the nodes is highly demanded. Because our results already allow for efficient implementation of entanglement purification, we anticipate our research to lay the ground for a fully fledged quantum repeater over a realistic high-loss and even turbulent quantum channel.

  17. Emergent littoral deposits in the eastern Canary Islands

    NASA Astrophysics Data System (ADS)

    Meco, Joaquin; Stearns, Charles E.

    1981-03-01

    K-Ar ages ( A. Abdel-Monem, P. D. Watkins, and P. W. Gast, 1971, American Journal of Science271, 490-521; this paper) and revised paleontological determinations ( J. Meco, 1977, "Los Strombus neogenos y cuatenarios del Atlantico euroafricano", Las Palmas, Ediciones del Excmo. Cabildo Insular de Gran Canaria) show that "Quaternary" ( R. Crofts, 1967, Quaternaria 9, 247-260; G. Lecointre, K. J. Tinkler, and G. Richards, 1967, Academy of Natural Science of Philadelphia Proceedings119, 325-344) littoral deposits on Lanzarote and Fuerteventura are early Pliocene and late Pleistocene. Early and middle Pleistocene strand lines are not represented. Early Pliocene littoral and marine deposits contain a characteristic fossil assemblage: Strombus coronatus, Nerità emiliana, Gryphaea virleti, Patella cf. intermedia, and Rothpletzia rudista. Differences in elevation record differential post-Pliocene uplift of the coastal platforms on which they lie. Late Pleistocene beach deposits at low elevations belong to two groups, an older with Strombus bubonius and a younger without. Differences in elevation of early Pliocene littoral deposits are reflected by differences in elevation of late Pleistocene beach deposits nearby.

  18. Screening of plants acting against Heterometrus laoticus scorpion venom activity on fibroblast cell lysis.

    PubMed

    Uawonggul, Nunthawun; Chaveerach, Arunrat; Thammasirirak, Sompong; Arkaravichien, Tarinee; Chuachan, Chattong; Daduang, Sakda

    2006-01-16

    The aqueous extracts of 64 plant species, listed as animal- or insect-bite antidotes in old Thai drug recipes were screened for their activity against fibroblast cell lysis after Heterometrus laoticus scorpion venom treatment. The venom was preincubated with plant extract for 30 min and furthered treated to confluent fibroblast cells for 30 min. More than 40% efficiency (test/control) was obtained from cell treatment with venom preincubated with extracts of Andrographis paniculata Nees (Acanthaceae), Barringtonia acutangula (L.) Gaertn. (Lecythidaceae), Calamus sp. (Palmae), Clinacanthus nutans Lindau (Acanthaceae), Euphorbia neriifolia L. (Euphorbiaceae), Ipomoea aquatica Forssk (Convolvulaceae), Mesua ferrea L. (Guttiferae), Passiflora laurifolia L. (Passifloraceae), Plectranthus amboinicus (Lour.) Spreng. (Labiatae), Ricinus communis L. (Euphorbiaceae), Rumex sp. (Polygonaceae) and Sapindus rarak DC. (Sapindaceae), indicating that they had a tendency to be scorpion venom antidotes. However, only Andrographis paniculata and Barringtonia acutangula extracts provided around 50% viable cells from extract treatments without venom preincubation. These two plant extracts are expected to be scorpion venom antidotes with low cytotoxicity. PMID:16169172

  19. Volcanic mercury in Pinus canariensis

    NASA Astrophysics Data System (ADS)

    Rodríguez Martín, José Antonio; Nanos, Nikos; Miranda, José Carlos; Carbonell, Gregoria; Gil, Luis

    2013-08-01

    Mercury (Hg) is a toxic element that is emitted to the atmosphere by both human activities and natural processes. Volcanic emissions are considered a natural source of mercury in the environment. In some cases, tree ring records taken close to volcanoes and their relation to volcanic activity over time are contradictory. In 1949, the Hoyo Negro volcano (La Palma-Canary Islands) produced significant pyroclastic flows that damaged the nearby stand of Pinus canariensis. Recently, 60 years after the eruption, we assessed mercury concentrations in the stem of a pine which survived volcano formation, located at a distance of 50 m from the crater. We show that Hg content in a wound caused by pyroclastic impacts (22.3 μg kg-1) is an order of magnitude higher than the Hg concentrations measured in the xylem before and after the eruption (2.3 μg kg-1). Thus, mercury emissions originating from the eruption remained only as a mark—in pyroclastic wounds—and can be considered a sporadic and very high mercury input that did not affect the overall Hg input in the xylem. In addition, mercury contents recorded in the phloem (9.5 μg kg-1) and bark (6.0 μg kg-1) suggest that mercury shifts towards non-living tissues of the pine, an aspect that can be related to detoxification in volcanism-adapted species.

  20. The European Galactic Plane Surveys: EGAPS

    NASA Astrophysics Data System (ADS)

    Groot, P. J.; Drew, J.; Greimel, R.; Gaensicke, B.; Knigge, C.; Irwin, M.; Mampaso, A.; Augusteijn, T.; Morales-Rueda, L.; Barlow, M.; Iphas Collaboration; Uvex Collaboration; Vphas+ Collaboration

    2006-08-01

    Introduction: The European Galactic Plane Surveys (EGAPS) will for the first time ever map the complete galactic plane (10x360 degrees) down to 21st magnitude in u', g', r', i' and H-alpha and partly in He I 5875. It will complete a database of ~1 billion objects. The aim of EGAPS is to study populations of short-lived stellar and binary phases in our Galaxy and combine these population studies with stellar and binary evolutionary codes to vastly improve our understanding of crucial phases of stellar evolution. Target populations include Wolf-Rayet stars, planetary nebulae, white dwarfs (in binaries), cataclysmic variables and other mass-transferring binaries. Methods: EGAPS is using the INT+WFC on La Palma for the Northern Hemisphere and will use the VST+Omegacam in the Southern Hemisphere. Results: The Northern red survey (IPHAS, using r', i', and Halpha) has started in 2003 and is currently 70% complete. The northern blue survey (UVEX; u',g',r' and HeI) has started in June 2006. Results include the detection of a number of rare planetary nebulae, cataclysmic variables, red-dwarf white dwarf binaries in clusters, a possible AM CVn candidate, and a deep photometric and spectroscopic investigation of the Cyg X region. Discussion: EGAPS will revolutionize the field of galactic stellar astrophysics by completing the first ever digital, multicolour survey of the Galactic Plane.

  1. Analysis of open sun drying experiments

    SciTech Connect

    Mulet, A. . Dept. of Food Technology); Berna, A. . Dept. of Chemical Engineering); Rossell, C.; Canellas, J. . Dept. of Chemistry)

    1993-01-01

    Open sun drying has lost its previous importance due to the fact that different factors affect its reliability and the quality of the products obtained. One of the set-backs for the analysis of solar drying experiments is their dependence on a non-controlled source of energy, i.e. solar radiation depends on climatic conditions and experiments are difficult to compare. It is thus necessary to investigate the advantages of a particular set up as well as the climatic influences. Open sun drying could constitute the natural reference, allowing the comparison of different drying strategies. A new way of standardizing drying times, based on solar radiation input, is proposed, to allow better evaluation of the experiments. An equivalent time is defined, allowing comparison of experiments carried out under different circumstances. Carrots and potatoes were used in these experiments. The use of the average daily solar radiation 15.28 MJ m[sup [minus]2][center dot]d[sup [minus]1] in Palma de Mallorca (39.33 N, 2.37 E), is proposed for comparison purposes. An improvement of more than 12% in the explained variance was observed, the unexplained variance being lower than 1%.

  2. Detailed Analysis of Near-IR Water (H2O) Emission in Comet C/2014 Q2 (Lovejoy) with the GIANO/TNG Spectrograph

    NASA Astrophysics Data System (ADS)

    Faggi, S.; Villanueva, G. L.; Mumma, M. J.; Brucato, J. R.; Tozzi, G. P.; Oliva, E.; Massi, F.; Sanna, N.; Tozzi, A.

    2016-10-01

    We observed the Oort cloud comet C/2014 Q2 (Lovejoy) on 2015 January 31 and February 1 and 2 at a heliocentric distance of 1.3 au and geocentric distance of 0.8 au during its approach to the Sun. Comet Lovejoy was observed with GIANO, the near-infrared high-resolution spectrograph mounted at the Nasmyth-A focus of the TNG (Telescopio Nazionale Galileo) telescope in La Palma, Canary Islands, Spain. We detected strong emissions of radical CN and water, along with many emission features of unidentified origin, across the 1–2.5 μm region. Spectral lines from eight ro-vibrational bands of H2O were detected, six of them for the first time. We quantified the water production rate [Q(H2O), (3.11 ± 0.14) × 1029 s‑1] by comparing the calibrated line fluxes with the Goddard full non-resonance cascade fluorescence model for H2O. The production rates of ortho-water [Q(H2O)ORTHO, (2.33 ± 0.11) × 1029 s‑1] and para-water [Q(H2O)PARA, (0.87 ± 0.21) × 1029 s‑1] provide a measure of the ortho-to-para ratio (2.70 ± 0.76)). The confidence limits are not small enough to provide a critical test of the nuclear spin temperature.

  3. A personal review of the history of the Royal Greenwich Observatory at Herstmonceux Castle, 1948-1990

    NASA Astrophysics Data System (ADS)

    Wilkins, G. A.

    2008-01-01

    The Royal Greenwich Observatory took its new name in 1948 at the start of the move to Herstmonceux Castle, when Sir Harold Spencer Jones was the Astronomer Royal. The move of the departments from their wartime bases to new buildings around the Castle was not completed until 1958, by which time the Astronomer Royal was Richard Woolley. He changed the primary emphasis of the astronomical work from long-term data-gathering programmes to astrophysical research. The transfer of responsibility for the Observatory from the Admiralty to the Science Research Council, in 1965, led eventually to a further major change in the 1970s, when Alan Hunter and Graham Smith were the Directors, as the primary task became the building of a new observatory on La Palma. During the 1980s, when Alec Boksenberg was Director, there were major cuts in staffing levels, especially for the public-service activities, and the RGO was moved to a new building in Cambridge in 1990.

  4. Volcanic mercury in Pinus canariensis.

    PubMed

    Rodríguez Martín, José Antonio; Nanos, Nikos; Miranda, José Carlos; Carbonell, Gregoria; Gil, Luis

    2013-08-01

    Mercury (Hg) is a toxic element that is emitted to the atmosphere by both human activities and natural processes. Volcanic emissions are considered a natural source of mercury in the environment. In some cases, tree ring records taken close to volcanoes and their relation to volcanic activity over time are contradictory. In 1949, the Hoyo Negro volcano (La Palma-Canary Islands) produced significant pyroclastic flows that damaged the nearby stand of Pinus canariensis. Recently, 60 years after the eruption, we assessed mercury concentrations in the stem of a pine which survived volcano formation, located at a distance of 50 m from the crater. We show that Hg content in a wound caused by pyroclastic impacts (22.3 μg kg(-1)) is an order of magnitude higher than the Hg concentrations measured in the xylem before and after the eruption (2.3 μg kg(-1)). Thus, mercury emissions originating from the eruption remained only as a mark-in pyroclastic wounds-and can be considered a sporadic and very high mercury input that did not affect the overall Hg input in the xylem. In addition, mercury contents recorded in the phloem (9.5 μg kg(-1)) and bark (6.0 μg kg(-1)) suggest that mercury shifts towards non-living tissues of the pine, an aspect that can be related to detoxification in volcanism-adapted species. PMID:23760570

  5. No-take areas as an effective tool to restore urchin barrens on subtropical rocky reefs

    NASA Astrophysics Data System (ADS)

    Sangil, Carlos; Clemente, Sabrina; Martín-García, Laura; Hernández, José Carlos

    2012-10-01

    Rapid declines in the sea urchin Diadema aff. antillarum densities and shifts in community states of sublittoral rocky reefs have been observed over a short period (between 2004 and 2008) for the first time in an area with fishing restrictions (the MPA of La Palma, Canary Islands, eastern Atlantic Ocean). Changes were spatially variable according to the MPA's use area considered. During this period there was a sea urchin density reduction (in some cases from 3.34 to 0.45 indv·m-2), and an increase of erect seaweed (up to 30% of cover) in the sites of the no-take area. In the partially restricted fishing area, the effect was less clear and only some sites, near to the no-take area, showed the sea urchin reduction and seaweed growth, in contrast to the increase of sea urchin densities outside the MPA. In addition to increased coverage, there was also a replacement of the ephemeral species by the perennial seaweed Lobophora variegata. These changes were related to increases in the abundance of fish predators of the sea urchins. In the no-take area, where there is total fishing restriction, predators were so abundant to induce shifts in the benthic community, while in the partially protected area such as outside the MPA, fishing prevented the top-down process and the changes in the communities.

  6. Source apportionment of PM10 in the Western Mediterranean based on observations from a cruise ship

    NASA Astrophysics Data System (ADS)

    Schembari, C.; Bove, M. C.; Cuccia, E.; Cavalli, F.; Hjorth, J.; Massabò, D.; Nava, S.; Udisti, R.; Prati, P.

    2014-12-01

    Two intensive PM10 sampling campaigns were performed in the summers of 2009 and 2010 on the ship Costa Pacifica during cruises in the Western Mediterranean. Samples, mainly collected on an hourly basis, were analysed with different techniques (Particle Induced X-Ray Emission, PIXE; Energy Dispersive - X Ray Fluorescence, ED-XRF; Ion Chromatography, IC; Thermo-optical analysis) to retrieve the PM10 composition and its time pattern. The data were used for obtaining information about the sources of aerosol, with a focus on ship emissions, through apportionment using chemical marker compounds, correlation analysis and Positive Matrix Factorization (PMF) receptor modelling. For the campaign in 2010, 66% of the aerosol sulphate was found to be anthropogenic, only minor contributions of dust and sea salt sulphate were observed while the biogenic contribution, estimated based on the measurements of MSA, was found to be more important (26%), but influenced by large uncertainties. V and Ni were found to be suitable tracers of ship emissions during the campaigns. Four sources of aerosol were resolved by the PMF analysis; the source having the largest impact on PM10, BC and sulphate was identified as a mixed source, comprising emissions from ships. The correlations between sulphate and V and Ni showed the influence of ship emissions on sulphate in marine air masses. For the leg Palma-Tunis crossing a main ship route, the correlations between aerosol sulphate and V and Ni were particularly strong (r2 = 0.9 for both elements).

  7. Serendipitous Discovery of a Projected Pair of QSOs Separated by 4.5 arcsec on the Sky

    NASA Astrophysics Data System (ADS)

    Heintz, K. E.; Fynbo, J. P. U.; Krogager, J.-K.; Vestergaard, M.; Møller, P.; Arabsalmani, M.; Geier, S.; Noterdaeme, P.; Ledoux, C.; Saturni, F. G.; Venemans, B.

    2016-07-01

    We present the serendipitous discovery of a projected pair of quasi-stellar objects (QSOs) with an angular separation of Δθ = 4.50 arcsec. The redshifts of the two QSOs are widely different: one, our program target, is a QSO with a spectrum consistent with being a narrow line Seyfert 1 active galactic nucleus at z = 2.05. For this target we detect Lyα, C iv, and C iii]. The other QSO, which by chance was included on the spectroscopic slit, is a Type 1 QSO at a redshift of z = 1.68, for which we detect C iv, C iii], and Mg ii. We compare this system to previously detected projected QSO pairs and find that only about a dozen previously known pairs have smaller angular separation. Based on observations made with the Nordic Optical Telescope, on the island of La Palma jointly operated by Denmark, Finland, Iceland, Norway, and Sweden, in the Spanish Observatorio del Roque de los Muchachos of the Instituto de Astrofisica de Canarias.

  8. Magnetospheric accretion and winds on the T Tauri star SU Aurigae. Multi-spectral line variability and cross-correlation analysis

    NASA Astrophysics Data System (ADS)

    Oliveira, J. M.; Foing, B. H.; van Loon, J. Th.; Unruh, Y. C.

    2000-10-01

    SU Aurigae is a T Tauri star that was well monitored during the MUSICOS 96 multi-site campaign. We present the results of the spectroscopic analysis of the circumstellar environment of this star, particularly of the Hα , Hβ , Na I D and He I D3 line profiles. The signatures of modulated outflows and mass accretion events are analysed, as well as transient spectral features. We compute the cross-correlation function (CCF) of several pairs of (velocity bins in) spectral lines to better investigate the profiles' temporal variability. We found increasing time lags between the variability of He I D3, Na I D and Hβ . We propose this may be understood in terms of azimuthal distortion of the magnetic field lines due to the different rotation rates of the star and the disk. We find the slightly blueshifted absorption features in Hα , Hβ \\ and Na I D to be anti-correlated with the accretion flow signatures. We propose that the transient absorption features in the blue wings of Hα , Hβ \\ and Na I D (signatures of mass outflows), and flare brightenings are related to the disruption of distorted magnetospheric field lines. Based on observations obtained during the MUSICOS~96 campaign in which were involved: Isaac Newton Telescope (INT, La Palma), Observatoire de Haute Provence (OHP, France), McDonald Observatory (MDO, USA), Beijing Astronomical Observatory (BAO, Xinglong, China) and Canada-France-Hawaii Telescope (CFHT, Hawaii).

  9. Identification of putative odorant binding protein genes in Asecodes hispinarum, a parasitoid of coconut leaf beetle (Brontispa longissima) by antennal RNA-Seq analysis.

    PubMed

    Li, Keming; Yang, Xiangbing; Xu, Guiying; Cao, Yang; Lu, Baoqian; Peng, Zhengqiang

    2015-11-20

    Asecodes hispinarum (Hymenoptera: Eulophidae) is an endoparasitoid and an efficient biological control agent which attacks larvae of Brontispa longissima, a serious insect pest of Palmae plants in China. Odorant binding proteins (OBPs) are believed to be important for transporting semiochemicals through the aqueous sensillar lymph to the olfactory receptor cells within the insect antennal sensilla. No previous study has reported on OBPs in A. hispinarum. In this study, we conducted the large-scale identification of OBP genes from the antennae of A. hispinarum by using transcriptome sequencing. Approximately 28.4 million total raw reads and about 27.3 million total clean reads were obtained, and then 46,363 unigenes were assembled. Of these unigenes, a total of 21,263 can be annotated in the NCBI non-redundant database. Among the annotated unigenes, 16,623 of them can be assigned to GO (Gene Ontology). Furthermore, we identified 8 putative OBP genes, and a phylogenetic tree analysis was performed to characterize the 8 OBP genes. In addition, the expression of the 8 OBP genes in different A. hispinarum body tissues was analyzed by real-time quantitative polymerase chain reaction (qRT-PCR). The results indicated that the 8 OBP genes were expressed accordingly to sexes and tissues, but all highly expressed in antennae. The finding of this study will lay the foundation for unraveling molecular mechanisms of A. hispinarum chemoperception. PMID:26454175

  10. Disentangling the complex evolutionary history of the Western Palearctic blue tits (Cyanistes spp.) - phylogenomic analyses suggest radiation by multiple colonization events and subsequent isolation.

    PubMed

    Stervander, Martin; Illera, Juan Carlos; Kvist, Laura; Barbosa, Pedro; Keehnen, Naomi P; Pruisscher, Peter; Bensch, Staffan; Hansson, Bengt

    2015-05-01

    Isolated islands and their often unique biota continue to play key roles for understanding the importance of drift, genetic variation and adaptation in the process of population differentiation and speciation. One island system that has inspired and intrigued evolutionary biologists is the blue tit complex (Cyanistes spp.) in Europe and Africa, in particular the complex evolutionary history of the multiple genetically distinct taxa of the Canary Islands. Understanding Afrocanarian colonization events is of particular importance because of recent unconventional suggestions that these island populations acted as source of the widespread population in mainland Africa. We investigated the relationship between mainland and island blue tits using a combination of Sanger sequencing at a population level (20 loci; 12 500 nucleotides) and next-generation sequencing of single population representatives (>3 200 000 nucleotides), analysed in coalescence and phylogenetic frameworks. We found (i) that Afrocanarian blue tits are monophyletic and represent four major clades, (ii) that the blue tit complex has a continental origin and that the Canary Islands were colonized three times, (iii) that all island populations have low genetic variation, indicating low long-term effective population sizes and (iv) that populations on La Palma and in Libya represent relicts of an ancestral North African population. Further, demographic reconstructions revealed (v) that the Canary Islands, conforming to traditional views, hold sink populations, which have not served as source for back colonization of the African mainland. Our study demonstrates the importance of complete taxon sampling and an extensive multimarker study design to obtain robust phylogeographical inferences.

  11. A Photometric and Spectroscopic Study of Dwarf and Giant Galaxies in the Coma Cluster. V. Dependence of the Spectroscopic Properties on Location in the Cluster

    NASA Astrophysics Data System (ADS)

    Carter, David; Mobasher, Bahram; Bridges, Terry J.; Poggianti, Bianca M.; Komiyama, Y.; Kashikawa, N.; Doi, M.; Iye, M.; Okamura, S.; Sekiguchi, M.; Shimasaku, K.; Yagi, M.; Yasuda, N.

    2002-03-01

    We investigate the radial dependence of the spectroscopic properties, in particular the Mg2, , and Hβ spectroscopic indices, in a sample of galaxies spanning a wide range of absolute luminosity in the Coma Cluster. After allowing for the magnitude dependence of these indices, we find a significant gradient in Mg2, in the sense that galaxies in the core of the cluster have stronger Mg2. We find only weak gradients in and Hβ. Using the model grids presented in an earlier paper in this series, we attribute the Mg2 gradient to changes in metal abundance. One possible mechanism to create this abundance gradient is pressure confinement by the intracluster medium of material from supernova-driven winds early in the history of the galaxies. Based on observations made with the William Herschel Telescope, operated on the island of La Palma by the Isaac Newton Group in the Spanish Observatorio del Roque de los Muchachos of the Instituto de Astrofísica de Canarias.

  12. The Breakup of C/1999 S4 (Linear), Days 0-10

    NASA Astrophysics Data System (ADS)

    Kidger, Mark R.

    2002-03-01

    The evolution of the morphology of C/1999 S4 (LINEAR) is examined from a series of images taken from shortly before the disruption of the nucleus until 10 days afterwards. This is combined with light curve data to provide a unique documentation of the early evolution of the disruption event. Neither images from the 1-m Jacobus Kapteyn Telescope nor the 2.5-m Isaac Newton Telescope at the Roque de los Muchachos Observatory (La Palma, Canary Islands, Spain) show no evidence of bright sub-nuclei, although the presence of a well-defined stable lance-point structure in the head of the comet indicates that a dust and gas producing source remained active in this region. The centre of brightness of the coma moved in the anti-solar direction at a few tens of metres per second after disruption indicating that it was a mainly dust structure. The contrast in the fragmentation history of comets such as C/1999 S4, C/2001 A2 and 141P/Machholz 2 suggests that there is a wide variation in nucleus properties from highly unstable and loosely bound rubble piles to relatively consolidated conglomerates.

  13. Cepheids as tracers of star formation in M 31. I. Observations and identifications

    NASA Astrophysics Data System (ADS)

    Magnier, E. A.; Augusteijn, T.; Prins, S.; van Paradijs, J.; Lewin, W. H. G.

    1997-12-01

    Cepheid variables can be used for more than just a distance indicator. Since the age can be determined from the period, they can be used to trace the star formation history of a galaxy. We have identified 130 new Cepheid variable candidates in M 31, particularly along the spiral arm regions in the north-east of the galaxy. These areas had not been searched for Cepheids in the previous study by Baade and collaborators. The contamination of our sample by other types of variables is low (< 3%). For V < 21, the completeness is ~53%. These Cepheids will be used to explore the star formation history in M 31. Based on observations made with the Isaac Newton Telescope operated on the island of La Palma by the Royal Greenwich Observatory in the Spanish Observatorio del Roque de los Muchachos of the Instituto de Astrofisica de Canarias. Table 1 and Figures 5 to 10 are only available in electronic form at CDS via anonymous ftp to cdsarc.u-strasbg.fr (130.79.128.5) or vai http://cdsweb.u-strasbg.f/Abstract.html

  14. Stellar Content and Recent Star Formation History of the Local Group Dwarf Irregular Galaxy IC 1613

    NASA Astrophysics Data System (ADS)

    Bernard, Edouard J.; Aparicio, Antonio; Gallart, Carme; Padilla-Torres, Carmen P.; Panniello, Maurizio

    2007-09-01

    We present resolved-star VI photometry of the Local Group dwarf irregular galaxy IC 1613 reaching I ~ 23.5, obtained with the wide-field camera at the 2.5 m Isaac Newton Telescope. A fit to the stellar density distribution shows an exponential profile of scale length 2.9' ± 0.1' and gives a central surface brightness μV,0 = 22.7 ± 0.6. The significant number of red giant branch (RGB) stars present in the outer part of our images (r > 16.5') indicates that the galaxy is actually more extended than previously estimated. A comparison of the color-magnitude diagrams (CMDs) as a function of galactocentric distance shows a clear gradient in the age of its population, the scale length increasing with age, while we find no evidence of a metallicity gradient from the width of the RGB. We present quantitative results of the recent star formation history from a synthetic CMD analysis using IAC-STAR. We find a mean star formation rate of (1.6 ± 0.8) × 10-3 Modot yr-1 kpc-2 in the central r lesssim 2.5' for the last 300 Myr. Based on observations made with the Isaac Newton Telescope, operated on the island of La Palma by the Isaac Newton Group, in the Spanish Observatorio del Roque de los Muchachos of the Instituto de Astrofísica de Canarias.

  15. A new CO2 vent for the study of ocean acidification in the Atlantic.

    PubMed

    Hernández, C A; Sangil, C; Hernández, J C

    2016-08-15

    Natural CO2 vents are considered the gold standard of ocean acidification (OA) studies. In coastal areas these rare vents have only been investigated at the Mediterranean temperate rocky reefs and at Indo-Pacific coral reefs, although there should be more at other volcanic shores around the world. Substantial scientific efforts on investigating OA effects have been mostly performed by laboratory experiments. However, there is a debate on how acute this kind of approach truly represents the responses to OA scenarios, since it generally involves short-term, rapid perturbation and single variable and species experiments. Due to these limitations, world areas with natural CO2 vents are essential to understand long-term marine ecosystem responses to rising human derived atmospheric CO2 concentrations. Here, we presented a new vent found in the subtropical North East Atlantic reefs (28°N, La Palma Island) that shows moderate CO2 emission (900ppm), reducing pH values to an annual average of 7.86±0.16.

  16. EMIR: cryogenic NIR multi-object spectrograph for GTC

    NASA Astrophysics Data System (ADS)

    Balcells, Marc; Guzman, R.; Patron, J.; Aragon-Salamanca, Alfonso; Azcue, J.; Ballester Lluch, Jose A.; Barroso, M. T.; Beigbeder, F.; Brau-Nogue, S.; Cardiel, N.; Carter, Dave; Diaz-Garcia, Jose J.; de la Fuente, E.; Fuentes, F. Javier; Fragoso-Lopez, Ana B.; Gago, Fernando; Gallego, J.; Gomez-Elvira, J.; Heredero, J. C.; Jones, Damien J.; Lopez, J. C.; Luke, P.; Manescau, Antonio; Munoz, T.; Peletier, R. F.; Pello, R.; Picat, Jean P.; Robertson, David J.; Rodriguez, J. A.; Serrano, Angel; Sharples, Ray M.; Zamorano, J.

    2000-08-01

    EMIR is a near-IR, multi-slit camera-spectrograph under development for the 10m GTC on La Palma. It will deliver up to 45 independent R equals 3500-4000 spectra of sources over a field of view of 6 feet by 3 feet, and allow NIR imaging over a 6 foot by 6 foot FOV, with spatial sampling of 0.175 inch/pixel. The prime science goal of the instrument is to open K-band, wide field multi-object spectroscopy on 10m class telescopes. Science applications range from the study of star-forming galaxies beyond z equals 2, to observations of substellar objects and dust-enshrouded star formation regions. Main technological challenges include the large optics, the mechanical and thermal stability and the need to implement a mask exchange mechanism that does not require warming up the spectrograph. EMIR is begin developed by the Instituto de Astrofisica de Canarias, the Instituto Nacional de Tecnica Aeroespacial, the Universidad Complutense de Madrid, the Observatoire Midi-Pyrennees, and the University of Durham. Currently in its Preliminary Design phase, EMIR is expected to start science operation in 2004.

  17. SPRAT: Spectrograph for the Rapid Acquisition of Transients

    NASA Astrophysics Data System (ADS)

    Piascik, A. S.; Steele, Iain A.; Bates, Stuart D.; Mottram, Christopher J.; Smith, R. J.; Barnsley, R. M.; Bolton, B.

    2014-07-01

    We describe the development of a low cost, low resolution (R ~ 350), high throughput, long slit spectrograph covering visible (4000-8000) wavelengths. The spectrograph has been developed for fully robotic operation with the Liverpool Telescope (La Palma). The primary aim is to provide rapid spectral classification of faint (V ˜ 20) transient objects detected by projects such as Gaia, iPTF (intermediate Palomar Transient Factory), LOFAR, and a variety of high energy satellites. The design employs a volume phase holographic (VPH) transmission grating as the dispersive element combined with a prism pair (grism) in a linear optical path. One of two peak spectral sensitivities are selectable by rotating the grism. The VPH and prism combination and entrance slit are deployable, and when removed from the beam allow the collimator/camera pair to re-image the target field onto the detector. This mode of operation provides automatic acquisition of the target onto the slit prior to spectrographic observation through World Coordinate System fitting. The selection and characterisation of optical components to maximise photon throughput is described together with performance predictions.

  18. RATS-Kepler - a deep high-cadence survey of the Kepler field

    NASA Astrophysics Data System (ADS)

    Ramsay, Gavin; Brooks, Adam; Hakala, Pasi; Barclay, Thomas; Garcia-Alvarez, David; Antoci, Victoria; Greiss, Sandra; Still, Martin; Steeghs, Danny; Gänsicke, Boris; Reynolds, Mark

    2014-01-01

    We outline the purpose, strategy and first results of a deep, high-cadence, photometric survey of the Kepler field using the Isaac Newton Telescope on La Palma and the MDM 1.3 m Telescope on Kitt Peak. Our goal was to identify sources located in the Kepler field of view which are variable on a time-scale of a few minutes to 1 h. The astrophysically most-interesting sources would then have been candidates for observation using Kepler using 1 min sampling. Our survey covered ˜42 per cent of the Kepler field of view, and we have obtained light curves for 7.1 × 105 objects in the range 13 < g < 20. We have discovered more than 100 variable sources which have passed our two stage identification process. As a service to the wider community, we make our data products and cleaned CCD images available to download. We obtained Kepler data of 18 sources which we found to be variable using our survey, and we give an overview of the currently available data here. These sources include a pulsating DA white dwarf, 11 δ Sct stars which have dominant pulsation periods in the range 24 min to 2.35 h, three contact binaries, and a cataclysmic variable (V363 Lyr). One of the δ Sct stars is in a contact binary.

  19. A new CO2 vent for the study of ocean acidification in the Atlantic.

    PubMed

    Hernández, C A; Sangil, C; Hernández, J C

    2016-08-15

    Natural CO2 vents are considered the gold standard of ocean acidification (OA) studies. In coastal areas these rare vents have only been investigated at the Mediterranean temperate rocky reefs and at Indo-Pacific coral reefs, although there should be more at other volcanic shores around the world. Substantial scientific efforts on investigating OA effects have been mostly performed by laboratory experiments. However, there is a debate on how acute this kind of approach truly represents the responses to OA scenarios, since it generally involves short-term, rapid perturbation and single variable and species experiments. Due to these limitations, world areas with natural CO2 vents are essential to understand long-term marine ecosystem responses to rising human derived atmospheric CO2 concentrations. Here, we presented a new vent found in the subtropical North East Atlantic reefs (28°N, La Palma Island) that shows moderate CO2 emission (900ppm), reducing pH values to an annual average of 7.86±0.16. PMID:27210563

  20. Volcanic mercury in Pinus canariensis.

    PubMed

    Rodríguez Martín, José Antonio; Nanos, Nikos; Miranda, José Carlos; Carbonell, Gregoria; Gil, Luis

    2013-08-01

    Mercury (Hg) is a toxic element that is emitted to the atmosphere by both human activities and natural processes. Volcanic emissions are considered a natural source of mercury in the environment. In some cases, tree ring records taken close to volcanoes and their relation to volcanic activity over time are contradictory. In 1949, the Hoyo Negro volcano (La Palma-Canary Islands) produced significant pyroclastic flows that damaged the nearby stand of Pinus canariensis. Recently, 60 years after the eruption, we assessed mercury concentrations in the stem of a pine which survived volcano formation, located at a distance of 50 m from the crater. We show that Hg content in a wound caused by pyroclastic impacts (22.3 μg kg(-1)) is an order of magnitude higher than the Hg concentrations measured in the xylem before and after the eruption (2.3 μg kg(-1)). Thus, mercury emissions originating from the eruption remained only as a mark-in pyroclastic wounds-and can be considered a sporadic and very high mercury input that did not affect the overall Hg input in the xylem. In addition, mercury contents recorded in the phloem (9.5 μg kg(-1)) and bark (6.0 μg kg(-1)) suggest that mercury shifts towards non-living tissues of the pine, an aspect that can be related to detoxification in volcanism-adapted species.

  1. MAGIC discovery of the BL Lac 1ES 1727+502: Multiwavelength observations, spectral behavior and variability

    NASA Astrophysics Data System (ADS)

    De Caneva, G.; Berger, K.; Lindfors, E.; Lombardi, S.; Mankuzhiyil, N.; Paneque, D.; Stamerra, A.; Tavecchio, F.; MAGIC Collaboration; Buson, S.; Fermi-LAT Collaboration

    2012-12-01

    The MAGIC experiment is a system of two Imaging Atmospheric Cherenkov Telescopes located in the Canary Island of La Palma (Northern hemisphere). It has an energy threshold of 50 GeV, the lowest among the currently operating Cherenkov telescopes, which makes it particularly suitable for the observation of extragalactic sources at Very High Energies (VHE, E>100 GeV). MAGIC has detected numerous blazars, which are active galactic nuclei whose jet axis is pointed towards the observer. Here we present one of our latest detections, the BL Lac 1ES 1727+502, located at redshift z=0.055. The source was a promising TeV candidate based on archival data and the observation that leads this detection was not triggered by any high state alert in other wavebands. We complemented our data with multiwavelength observations: optical data from the KVA telescope, UV, optical and X-ray data taken with the instruments on board the Swift satellite and High Energy (HE, 100; MeV < E < 100; GeV) data from the Fermi-LAT (Large Area Telescope). We studied the spectral energy distribution (SED) of 1ES 1727+502 and interpreted it with a one-zone synchrotron self-Compton model obtaining parameters typical for this class of sources.

  2. The collecting activities of James Cuninghame FRS on the voyage of Tuscan to China (Amoy) between 1697 and 1699

    PubMed Central

    Jarvis, Charles E.; Oswald, Philip H.

    2015-01-01

    James Cuninghame's visit to China (1697–99) yielded a great deal of valuable information on both natural and artificial objects as well as items of contemporaneous trade interest (for example china clay and a scarlet dye). However, the circumstances surrounding the voyage have long been unclear. Although it has previously been assumed that Cuninghame must have travelled on an East India Company vessel, it now seems that he was aboard Tuscan, one of two private trading ships (interlopers) bound for Amoy under the command of Henry Gough. After an incident in La Palma (Canary Islands), only Tuscan proceeded to China after her release by the Spanish authorities. Study of surviving correspondence between Cuninghame and a Canarian cleric, Juan Bautista Poggio, has contributed to a better understanding of the events in the early part of the voyage. Cuninghame made extensive natural history collections during the six months that Tuscan remained in Amoy, before returning to England in 1699, where his specimens delighted his London supporters, James Petiver and Hans Sloane.

  3. E-ELT seeing and isoplanatic angle: comparison of Aklim site and El Roque de Los Muchachos Observatory

    NASA Astrophysics Data System (ADS)

    Sabil, M.; Benkhaldoun, Z.; Lazrek, M.; Habib, A.; Benhida, A.; Hach, Y.; Elazhari, Y.; Elhalkouj, T.

    2014-07-01

    The new Extremely Large Telescope projects need accurate evaluation of the candidate sites. In this work we present the seeing, free seeing and isoplanatic angle comparison between Aklim site located in Moroccan Anti- Atlas at the geographic coordinates 30°7'39" N, 08 18'39" W, and the Observatorio del Roque de Los Muchachos (ORM), located in La Palma, Canary Islands, at 28°45'00 N, 17°53"10 W, the both sites are pre-selected to house the E-ELT. In this work we present the seeing statistics of (Ɛ), the free seeing (Ɛ free) and the isoplanatic angle ϴ0 measurements at each site, statistics of the mentioned parameters are obtained from the whole data recorded from 09 May 2008 to 09 November 2009 using the Multi Aperture Scintillation Sensor (MASS) - Differential Image Motion Monitor (DIMM) system, compare the common data between the tow sites, more representative results and statistics are shown hereafter.

  4. The role of marinas and recreational boating in the occurrence and distribution of exotic caprellids (Crustacea: Amphipoda) in the Western Mediterranean: Mallorca Island as a case study

    NASA Astrophysics Data System (ADS)

    Ros, Macarena; Vázquez-Luis, Maite; Guerra-García, José M.

    2013-10-01

    In the Mediterranean Sea, the number of alien marine crustacean species has increased over the past two decades. However, knowledge about small alien marine crustaceans, like caprellid amphipods, is still very scarce. To understand the role of marinas and recreational boating in the early step of the invasion process by non-indigenous caprellids, we studied the recreational boating pressure and the spatial distribution of caprellid species in Mallorca Island. We collected caprellids from 14 marinas and 9 exposed intertidal rocky shores between November 2011 and April 2012 and we analyzed the differences in habitat use of native and exotic caprellids. Eight caprellid species, six native and two exotic, were found. Alien caprellids were only present in marinas, reaching high densities of population. The analysis of recreational boating pressure reveals that Palma-Migjorn is the area that is subject to the highest potential risk of introduction of exotic species via ship fouling. In the secondary dispersal of alien caprellids, the study reflects that recreational boating seems effective as a secondary vector in the transport of exotic species from marinas to marinas but not from marinas to natural and exposed areas. An illustrated key of caprellids from Balearic Island is provided to differentiate native and non-indigenous species.

  5. Screening of plants acting against Heterometrus laoticus scorpion venom activity on fibroblast cell lysis.

    PubMed

    Uawonggul, Nunthawun; Chaveerach, Arunrat; Thammasirirak, Sompong; Arkaravichien, Tarinee; Chuachan, Chattong; Daduang, Sakda

    2006-01-16

    The aqueous extracts of 64 plant species, listed as animal- or insect-bite antidotes in old Thai drug recipes were screened for their activity against fibroblast cell lysis after Heterometrus laoticus scorpion venom treatment. The venom was preincubated with plant extract for 30 min and furthered treated to confluent fibroblast cells for 30 min. More than 40% efficiency (test/control) was obtained from cell treatment with venom preincubated with extracts of Andrographis paniculata Nees (Acanthaceae), Barringtonia acutangula (L.) Gaertn. (Lecythidaceae), Calamus sp. (Palmae), Clinacanthus nutans Lindau (Acanthaceae), Euphorbia neriifolia L. (Euphorbiaceae), Ipomoea aquatica Forssk (Convolvulaceae), Mesua ferrea L. (Guttiferae), Passiflora laurifolia L. (Passifloraceae), Plectranthus amboinicus (Lour.) Spreng. (Labiatae), Ricinus communis L. (Euphorbiaceae), Rumex sp. (Polygonaceae) and Sapindus rarak DC. (Sapindaceae), indicating that they had a tendency to be scorpion venom antidotes. However, only Andrographis paniculata and Barringtonia acutangula extracts provided around 50% viable cells from extract treatments without venom preincubation. These two plant extracts are expected to be scorpion venom antidotes with low cytotoxicity.

  6. PAU, a fully depleted mosaic imager with narrow band filters

    NASA Astrophysics Data System (ADS)

    Bauer, A.; Casas, R.; Castander, F. J.; Serrano, S.

    2014-03-01

    The PAU Survey studies the existence and properties of dark energy from the observations of redshift space distortions and weak lensing magnification from galaxy cross-correlations as main cosmological probes. The PAU Team is building an instrument, PAUCam, equipped with fully depleted CCD detectors, designed to be mounted at the prime focus of the 4.2 m diameter William Herschel Telescope (WHT) in La Palma. Simulations indicate that PAUCam at the WHT will be able to image about 2 square degrees per night in 40 narrow-band filters plus six wide-band filters to an AB magnitude depth of i ~ 22.5, providing low-resolution (R ~ 50) photometric spectra for around 30,000 galaxies, 5,000 stars and 1,000 quasars per square degree. Accurate photometric calibration of the PAU data is vital to achieve the survey science goals. This calibration is challenging due to the large and unusual filter set. We outline the data management pipelines being developed for the survey, both for nightly data reduction and co-addition of multiple epochs, with emphasis on the photometric calibration strategies. We also describe the main tests and results in the characterization of our Hamamatsu fully depleted detectors.

  7. Progress with a green astro-comb for exoplanet searches. Type: poster

    NASA Astrophysics Data System (ADS)

    Phillips, David F.; Li, Chih-Hao; Glenday, Alexander; Sasselov, Dimitar; Szentgyorgyi, Andrew; Walsworth, Ronald L.

    2016-05-01

    Searches for extrasolar planets using the precision stellar radial velocity (RV) measurement technique are approaching Earth-like planet sensitivity. Astro-combs, which consist of a laser frequency comb, coherent wavelength shifting mechanism (such as a doubling crystal and photonic crystal fiber), and a mode-filtering Fabry-Perot cavity (FPC), provide a promising route to increased accuracy and long-term stability on the astrophysical spectrograph calibration. We first present the design of a green astro-comb from an octave spanning Ti:Sapphire laser, spectrally broadened by custom tapered PCF to the visible band via fiber-optic Cherenkov radiation for frequency shifting, and filtered by a broadband FPC, constructed by a pair of complementary chirped mirrors. We also present results from three years of operation of the astro-comb calibrating the HARPS-N spectrograph at the Italian National Telescope on La Palma, Canary Islands, including its use in measurements of solar radial velocities as well as its use in searches for extrasolar planets.

  8. Health status and satisfaction of asymptomatic HIV-positive haemophiliacs in Kyushu, Japan.

    PubMed

    Tanaka, S; Hachisuka, K; Okazaki, T; Shirahata, A; Ogata, H

    1999-01-01

    The purpose of this study was to elucidate the effects of human immunodeficiency virus (HIV) on haemophiliacs with physical functional disabilities induced by haemophilia in Kyushu, Japan. The subjects were 38 adult haemophiliacs who were selected from 129 patients registered with the North Kyushu Haemophilia Centre. They were divided into 21 asymptomatic HIV-positive and 17 HIV-negative adult haemophiliacs. Coagulation factor levels, modified DePalma classification, Arthritis Impact Measurement Scale 2 (AIMS 2), and a satisfaction in daily life (SDL) questionnaire were used to investigate the clinical severity of their haemophilia and arthropathy, physical functional disabilities, and satisfaction. Although there were no significant differences in the objective assessments of health status between the HIV-positive and -negative haemophiliacs, the HIV-positive haemophiliacs were significantly more dissatisfied with their social activities and mood, according to AIMS 2, and with social intercourse, job, self-development, and social security and pension according to SDL assessment. These dissatisfactions were due to the effects of HIV, in addition to the physical functional disabilities that were caused by haemophilia. Dissatisfaction with social security and pension may be a specific feature in HIV-positive haemophiliacs in Japan resulting from the origin of HIV infection.

  9. The F-layer pre-reversal enhancement (PRE) at equatorial region and its effects on the F-layer at low-latitudes

    NASA Astrophysics Data System (ADS)

    Barbosa Roony, Flavio Evangelista; Fagundes, Paulo Roberto; Pillat, Valdir Gil

    It is well known that electric fields generated by the E region dynamo, via tidal winds, are transmitted along the dipole magnetic field lines to equatorial F region altitudes, due to the high electric conductivity along the magnetic field lines. During the daytime, the dynamo electric fields are eastward, which causes an upward E x B plasma drift. While during the night, the electric fields are westward and cause a downward E x B plasma drift. However, near sunset, just before the eastward daytime field reverses to westward, the eastward electric field usually shows a strong enhancement. Such phenomenon is the so-called ‘‘pre-reversal enhancement’’ (PRE) of the zonal eastward electric field near the sunset terminator and causes post-sunset F-layer uplift (Fagundes et al., 2009). This study was carried out using two ionosonde stations, almost aligned to the same magnetic meridian, Palmas (10.2S, 48.2W; dip latitude 8.3S - near equatorial region) and Sao Jose dos Campos (23.2S, 45.9W; dip latitude 20.2S - near the southern crest of the ionospheric equatorial ionization anomaly - EIA). The ionospheric parameters (h'f and foF2), during high solar activity (2002-2003), are analyzed in both stations to study how the PRE strength affects the equatorial ionization anomaly (EIA).

  10. H II Regions in Interacting Galaxies

    NASA Astrophysics Data System (ADS)

    Frattare, L. M.; Keel, W. C.; Laurikainen, E.

    1993-12-01

    We present a census of H II regions in 50 pairs of interacting galaxies, carried out on CCD and ISIT narrow-band images from Kitt Peak, Lowell, and La Palma. Objects were identified objectively using peak finding at multiple Gaussian smoothing levels to allow for the fact that the larger H II regions are marginally resolved, and measured using aperture photometry. We consider statistics of the space distribution, radial distribution, and luminosity functions. Preliminary analysis shows that the enhancement in star formation is strongest not only in the nuclear regions, but in preferred annuli as well. Interactions can produce significant asymmetries in the star-formation distribution. Some interacting galaxies show flatter luminosity functions for H II regions than seen in normal galaxies, either through an excess of very luminous star-forming complexes or a change in their clumping properties. We compare the statistics of both the location and luminosity of H II regions in interacting systems to results on isolated spirals. This work was supported by the NSF through REU grant AST-9300413 and EPSCoR grant EHR-9108761.

  11. Constraining planet structure from stellar chemistry: the cases of CoRoT-7, Kepler-10, and Kepler-93

    NASA Astrophysics Data System (ADS)

    Santos, N. C.; Adibekyan, V.; Mordasini, C.; Benz, W.; Delgado-Mena, E.; Dorn, C.; Buchhave, L.; Figueira, P.; Mortier, A.; Pepe, F.; Santerne, A.; Sousa, S. G.; Udry, S.

    2015-08-01

    Aims: We explore the possibility that the stellar relative abundances of different species can be used to constrain the bulk abundances of known transiting rocky planets. Methods: We use high resolution spectra to derive stellar parameters and chemical abundances for Fe, Si, Mg, O, and C in three stars hosting low mass, rocky planets: CoRoT-7, Kepler-10, and Kepler-93. These planets follow the same line along the mass-radius diagram, pointing toward a similar composition. The derived abundance ratios are compared with the solar values. With a simple stoichiometric model, we estimate the iron mass fraction in each planet, assuming stellar composition. Results: We show that in all cases, the iron mass fraction inferred from the mass-radius relationship seems to be in good agreement with the iron abundance derived from the host star's photospheric composition. Conclusions: The results suggest that stellar abundances can be used to add constraints on the composition of orbiting rocky planets. Based on archival data obtained with the SOPHIE (1.93-m telescope OHP observatory), HARPS (3.6-m ESO, La Silla-Paranal Observatory), and HARPS-N (TNG telescope, La Palma) spectrographs.Appendices are available in electronic form at http://www.aanda.org

  12. Intermittent dust mass loss from activated asteroid P/2013 P5 (PANSTARRS)

    SciTech Connect

    Moreno, F.; Pozuelos, F.

    2014-02-01

    We present observations and models of the dust environment of activated asteroid P/2013 P5 (PANSTARRS). The object displayed a complex morphology during the observations, with the presence of multiple tails. We combined our own observations, all made with instrumentation attached to the 10.4 m Gran Telescopio Canarias on La Palma, with previously published Hubble Space Telescope images to build a model aimed at fitting all the observations. Altogether, the data cover a full three month period of observations which can be explained by intermittent dust loss. The most plausible scenario is that of an asteroid rotating with the spinning axis oriented perpendicular to the orbit plane and losing mass from the equatorial region, consistent with rotational break-up. Assuming that the ejection velocity of the particles (v ∼ 0.02-0.05 m s{sup –1}) corresponds to the escape velocity, the object diameter is constrained to ∼30-130 m for bulk densities 3000-1000 kg m{sup –3}.

  13. Teleportation of entanglement over 143 km

    PubMed Central

    Herbst, Thomas; Scheidl, Thomas; Fink, Matthias; Handsteiner, Johannes; Wittmann, Bernhard; Ursin, Rupert; Zeilinger, Anton

    2015-01-01

    As a direct consequence of the no-cloning theorem, the deterministic amplification as in classical communication is impossible for unknown quantum states. This calls for more advanced techniques in a future global quantum network, e.g., for cloud quantum computing. A unique solution is the teleportation of an entangled state, i.e., entanglement swapping, representing the central resource to relay entanglement between distant nodes. Together with entanglement purification and a quantum memory it constitutes a so-called quantum repeater. Since the aforementioned building blocks have been individually demonstrated in laboratory setups only, the applicability of the required technology in real-world scenarios remained to be proven. Here we present a free-space entanglement-swapping experiment between the Canary Islands of La Palma and Tenerife, verifying the presence of quantum entanglement between two previously independent photons separated by 143 km. We obtained an expectation value for the entanglement-witness operator, more than 6 SDs beyond the classical limit. By consecutive generation of the two required photon pairs and space-like separation of the relevant measurement events, we also showed the feasibility of the swapping protocol in a long-distance scenario, where the independence of the nodes is highly demanded. Because our results already allow for efficient implementation of entanglement purification, we anticipate our research to lay the ground for a fully fledged quantum repeater over a realistic high-loss and even turbulent quantum channel. PMID:26578764

  14. OSIRIS tunable imager and spectrograph for the GTC: from design to commissioning

    NASA Astrophysics Data System (ADS)

    Sánchez, Beatriz; Aguiar-González, Marta; Barreto, Roberto; Becerril, Santiago; Bland-Hawthorn, Joss; Bongiovanni, Angel; Cepa, Jordi; Correa, Santiago; Chapa, Oscar; Ederoclite, Alessandro; Espejo, Carlos; Farah, Alejandro; Fragoso, Ana Belén.; Fernández, Patricia; Flores, Rubén.; Fuentes, F. Javier; Gago, Fernando; Garfias, Fernando; Gigante, José Vicente; González, Jesús; González-Escalera, Victor; Hernández, Belén.; Hernandez, Elvio; Herrera, Alberto; Herrera, Guillermo; Joven, Enrique; Langarica, Rosalia; Lara, Gerardo; López, José Carlos; López, Roberto; Militellon, Carmelo; Moreno, Heidy; Peraza, Lorenzo; Pérez, Angeles; Pérez, Jaime; Rasilla, José Luis; Rosich, Josefina; Tejada, Carlos; Tinoco, Silvio; Vaz, Txinto; Villegas, Alejandro

    2012-09-01

    OSIRIS (Optical System for Imaging and low Resolution Integrated Spectroscopy) was the optical Day One instrument for the 10.4m Spanish telescope GTC. It is installed at the Observatorio del Roque de Los Muchachos (La Palma, Spain). This instrument has been operational since March-2009 and covers from 360 to 1000 nm. OSIRIS observing modes include direct imaging with tunable and conventional filters, long slit and low resolution spectroscopy. OSIRIS wide field of view and high efficiency provide a powerful tool for the scientific exploitation of GTC. OSIRIS was developed by a Consortium formed by the Instituto de Astrofísica de Canarias (IAC) and the Instituto de Astronomía de la Universidad Nacional Autónoma de México (IA-UNAM). The latter was in charge of the optical design, the manufacture of the camera and collaboration in the assembly, integration and verification process. The IAC was responsible for the remaining design of the instrument and it was the project leader. The present paper considers the development of the instrument from its design to its present situation in which is in used by the scientific community.

  15. Results of the verification of EMIR, the NIR MOS for the GTC

    NASA Astrophysics Data System (ADS)

    Garzón, F.; Castro-Rodríguez, N.; Insausti, M.; López-Martín, L.; Hammersley, P.; Barreto, M.; Fernández, P.; Joven, E.; López, P.; Mato, A.; Moreno, H.; Núñez, M.; Patrón, J.; Rasilla, J. L.; Redondo, P.; Rosich, J.; Pascual, S.; Grange, R.

    2015-05-01

    EMIR is one of the first common user instruments for the GTC, the 10 meter telescope operating at the Roque de los Muchachos Observatory (La Palma, Canary Islands, Spain). EMIR is being built by a Consortium of Spanish and French institutes led by the Instituto de Astrofísica de Canarias (IAC). EMIR is primarily designed to be operated as a MOS in the K band, but offers a wide range of observing modes, including imaging and spectroscopy, both long slit and multi--object, in the wavelength range 0.9 to 2.5 μm. The principal units and features of the EMIR instrument are listed and the main results of the verification performed so far are discussed. EMIR is now at the middle of its System Verification Phase, and is due for first commissioning at the GTC in mid 2015. This contribution reports on the results achieved so far during the verification phase at the IAC prior to its shipment to the GTC for being commissioned. The development and fabrication of EMIR is funded by GRANTECAN and the Plan Nacional de Astronomía y Astrofísica (National Plan for Astronomy and Astrophysics, Spain).

  16. Longitudinal and latitudinal distribution of perfluoroalkyl compounds in the surface water of the Atlantic Ocean.

    PubMed

    Ahrens, Lutz; Barber, Jonathan L; Xie, Zhiyong; Ebinghaus, Ralf

    2009-05-01

    Perfluoroalkyl compounds (PFCs) were determined in 2 L surface water samples collected in the Atlantic Ocean onboard the research vessels Maria S. Merian along the longitudinal gradient from Las Palmas (Spain) to St. Johns (Canada) (15 degrees W to 52 degrees W) and Polarstern along the latitudinal gradient from the Bay of Biscay to the South Atlantic Ocean (46 degrees N to 26 degrees S) in spring and fall 2007, respectively. After filtration the dissolved and particulate phases were extracted separately, and PFC concentrationswere determined using high-performance liquid chromatography interfaced to tandem mass spectrometry. No PFCs were detected in the particulate phase. This study provides the first concentration data of perfluorooctanesulfonamide (FOSA), perfluorohexanoic acid, and perfluoroheptanoic acid from the Atlantic Ocean. Results indicate that trans-Atlantic Ocean currents caused the decreasing concentration gradient from the Bay of Biscay to the South Atlantic Ocean and the concentration drop-off close to the Labrador Sea. Maximum concentrations were found for FOSA, perfluorooctanesulfonate, and perfluorooctanoic acid at 302, 291, and 229 pg L(-1), respectively. However, the concentration of each single compound was usually in the tens of picograms per liter range. South of the equator only FOSA and below 4 degrees S no PFCs could be detected.

  17. SmartPort: A Platform for Sensor Data Monitoring in a Seaport Based on FIWARE

    PubMed Central

    Fernández, Pablo; Santana, José Miguel; Ortega, Sebastián; Trujillo, Agustín; Suárez, José Pablo; Domínguez, Conrado; Santana, Jaisiel; Sánchez, Alejandro

    2016-01-01

    Seaport monitoring and management is a significant research area, in which infrastructure automatically collects big data sets that lead the organization in its multiple activities. Thus, this problem is heavily related to the fields of data acquisition, transfer, storage, big data analysis and information visualization. Las Palmas de Gran Canaria port is a good example of how a seaport generates big data volumes through a network of sensors. They are placed on meteorological stations and maritime buoys, registering environmental parameters. Likewise, the Automatic Identification System (AIS) registers several dynamic parameters about the tracked vessels. However, such an amount of data is useless without a system that enables a meaningful visualization and helps make decisions. In this work, we present SmartPort, a platform that offers a distributed architecture for the collection of the port sensors’ data and a rich Internet application that allows the user to explore the geolocated data. The presented SmartPort tool is a representative, promising and inspiring approach to manage and develop a smart system. It covers a demanding need for big data analysis and visualization utilities for managing complex infrastructures, such as a seaport. PMID:27011192

  18. Phylogeny of the Macaronesian endemic Crambe section Dendrocrambe (Brassicaceae) based on internal transcribed spacer sequences of nuclear ribosomal DNA.

    PubMed

    Francisco-Ortega, Javier; Fuertes-Aguilar, Javier; Kim, Seung-Chul; Santos-Guerra, Arnoldo; Crawford, Daniel J; Jansen, Robert K

    2002-12-01

    The 14 species of Crambe L. sect. Dendrocrambe DC. (Brassicaceae) form a monophyletic group endemic to the Canary and Madeira archipelagos. Both parsimony and maximum likelihood analyses of sequence data from the two internal transcribed spacer regions of nuclear ribosomal DNA were used to estimate phylogenetic relationships within this section. These analyses support the monophyly of three major clades. No clade is restricted to a single island, and therefore it appears that inter-island colonization has been the main avenue for speciation in these two archipelagos. The two species endemic to Fuerteventura (C. sventenii) and Madeira (C. fruticosa) comprise a clade, providing the first evidence for a floristic link between the Eastern Canary Islands and the archipelago of Madeira. Both maximum likelihood and weighted parsimony analyses show that this clade is sister to the two other clades, although bootstrap support for this relationship is weak. Parsimony optimizations of ecological zones and island distribution suggest a colonization route from the low-altitude areas of the lowland scrub toward the high-elevation areas of the laurel and pine forests. In addition, Tenerife is likely the ancestral island for species endemic to the five westernmost islands of Gran Canaria, La Gomera, El Hierro, La Palma, and Tenerife.

  19. Sex determination by discriminant function analysis of the right tibia in the prehispanic population of the Canary Islands.

    PubMed

    González-Reimers, E; Velasco-Vázquez, J; Arnay-de-la-Rosa, M; Santolaria-Fernández, F

    2000-02-28

    This study has been performed in order to define standards usable to determine the sex of prehispanic individuals from the Canary Islands from their skeletal remains. Osteometric information at the right tibia was obtained from 59 complete skeletons from Gran Canaria, housed in the Museo Canario (Las Palmas), 45 males and 14 females (this constitutes the totality of complete prehispanic skeletons known from Gran Canaria). The parameters measured were: tibial length, proximal and distal epiphyseal breadth, transverse and anteroposterior diameter, perimeter at the nutrition foramen levels and minimum shaft perimeter. These parameters were subjected to different SPSS discriminant function analysis, combining all of them, or only the proximal or distal ones, without tibial length, etc., in order to obtain functions usable even if only bone fragments are available. Transverse diameter, proximal epiphyseal breadth and minimum shaft perimeter showed the highest discriminant power. The functions obtained showed high average accuracies, ranging from 94.9 to 98.3%, with female accuracies of 100%. The functions obtained were further applied to a test prehispanic population (ten males and ten females) from El Hierro. Overall accuracies of the functions when applied to this population ranged from 65 to 94.7%, with female accuracies ranging 80% to 100%.

  20. Time-Dependent Wave Packet Study of the H2 + CH3 → H + CH4 Reaction.

    PubMed

    Zhang, Zhaojun; Chen, Jun; Yang, Minghui; Zhang, Dong H

    2015-12-17

    The initial state selected time-dependent wave packet method has been developed to study the H2 + CH3 → H + CH4 reaction, by employing the seven- and eight-dimensional models proposed by Palma and Clary in which the nonreacting CH3 moiety is restricted in C3v symmetry. Total reaction probabilities and integral cross sections were calculated for the ground and a number of vibrationally excited initial states to investigate the effects of vibrational excitations of both reagents on the reaction. The eight-dimensional calculations showed that the CH stretching excitation does not have any important effect on the reaction and the seven-dimensional model with the CH bond length fixed works very well for the reaction. The excitation of H2 vibrations could enhance the reaction but is less effective than the translation in the low energy region. In contrast, the first umbrella excitation is very effective on reducing the reaction threshold. The calculated rate constants are found to be in good agreement with available experimental measurements and other theoretical results. PMID:26495964

  1. Transvenous Embolization of a Spontaneous Femoral AVF 5 Years After an Incomplete Treatment with Arterial Stent-Grafts

    SciTech Connect

    Peynircioglu, Bora Ozkan, Murat; Dogan, Omer Faruk; Cil, Barbaros E.; Dogan, Riza

    2008-03-15

    A 66-year-old man with complex left femoral arterio-venous fistula (AVF) was first diagnosed after a deep venous thrombosis incident approximately 5 years ago. Partial treatment was performed by means of endografts along the superficial femoral artery, which remained patent for 5 years. The patient had been doing well until a couple of months ago when he developed severe venous stasis and ulcers of the left cruris, due to a high-flow nonhealing complex AVF with additional iliac vein occlusion. Therefore; the definitive treatment was performed by a unique endovascular technique combined with surgical venous bypass (femoro-femoral crossover saphenous bypass, the Palma operation). A novel percutaneous transvenous technique for occlusion of a complex high-flow AVF is reported with a review of the literature. The case is unique with spontaneous AVF, transvenous embolization with detachable coils and ONYX, and the hybrid treatment technique as well as the long-term patency of superficial femoral artery stent-grafts.

  2. VizieR Online Data Catalog: Carlsberg Meridian Catalog, Vol. 7 (CMC7, 1993)

    NASA Astrophysics Data System (ADS)

    Copenhagen University Observatory; Royal Greenwich Observatory

    1995-11-01

    The Carlsberg Meridian Catalogues give accurate positions, proper motions and magnitudes of stars north of declination -45deg and down to 15th magnitude. They also contain observations of the solar system objects: Mars, Callisto, Saturn, Titan, Iapetus, Uranus, Neptune, Pluto, and many minor planets. Typical mean errors for an entry are 0.1arcsec in position, 3mas/yr in proper motion, and 0.05mag in magnitude. The stars observed belong to a large number of observing programmes typically dealing with the reference frame or with galactic kinematics. The Carlsberg Automatic Meridian Circle on La Palma is operated by Copenhagen University Observatory, Royal Greenwich Observatory, and Real Instituto y Observatorio de la Armada at the Observatory del Roque de los Muchachos of the Instituto de Astrofisica de Canarias. For a detailed introduction, please refer to the printed catalogue. A description of the programme may also be found in the 1993 paper by Fabricius (=1993BICDS..42....5F), from which the present description is derived. Originally the CMC7 was planned to contain only observations from 1991. The actual CMC7 comprises nearly 20 month (January 1991 to August 1992) and is thus more extensive than foreseen when a description was published in Bull. CDS (=1993BICDS..42....5F) Published by Copenhagen University Observatory, Royal Greenwich Observatory and Real Instituto y Observatorio de la Armada en San Fernando. 1993. (5 data files).

  3. Spicules, mass transfer, oscillations, and the heating of the corona

    NASA Astrophysics Data System (ADS)

    Pasachoff, J. M.; Kozarev, K. A.; Butts, D. L.; Gangestad, J. W.; Seaton, D. B.; de Pontieu, B.; Golub, L.; Deluca, E.; Wilhelm, K.; Dammasch, I.

    2005-05-01

    The mass moving in chromospheric spicules is enough to replace the corona in a brief time, so understanding the dynamics of spicules is important for understanding the support and heating of the solar corona. We have undertaken a program involving simultaneous high-resolution observations in various chromospheric visible lines (H-alpha, Ca II H, and G-band, as well as Dopplergrams) using the Swedish Solar Telescope on La Palma, ultraviolet chromospheric, transition-region, and coronal lines (Fe IX/X 171 A, Lyman-alpha 1216 A, and continuum/C I/C IV 1600 A) using NASA's TRACE, and ultraviolet chromospheric and transition-region lines (Si II 1533, C IV 1548, and Ne VIII 770) using SUMER on SOHO. Our first coordinated observing run, in May 2004, yielded a variety of images that are under study, especially for the morphological statistics and dynamics of spicules. The energy transfer through the chromosphere is relevant to the overlapping investigation of coronal heating through rapid (1Hz range) oscillations of coronal loops as observed at total eclipses by Williams College expeditions. This research is supported by NASA grant number NNG04GK44G to Williams College. TRACE analysis at SAO is supported by a contract from Lockheed Martin. SOHO is a project of international cooperation between ESA and NASA.

  4. Porting and refurbishment of the WSS TNG control software

    NASA Astrophysics Data System (ADS)

    Caproni, Alessandro; Zacchei, Andrea; Vuerli, Claudio; Pucillo, Mauro

    2004-09-01

    The Workstation Software Sytem (WSS) is the high level control software of the Italian Galileo Galilei Telescope settled in La Palma Canary Island developed at the beginning of '90 for HP-UX workstations. WSS may be seen as a middle layer software system that manages the communications between the real time systems (VME), different workstations and high level applications providing a uniform distributed environment. The project to port the control software from the HP workstation to Linux environment started at the end of 2001. It is aimed to refurbish the control software introducing some of the new software technologies and languages, available for free in the Linux operating system. The project was realized by gradually substituting each HP workstation with a Linux PC with the goal to avoid main changes in the original software running under HP-UX. Three main phases characterized the project: creation of a simulated control room with several Linux PCs running WSS (to check all the functionality); insertion in the simulated control room of some HPs (to check the mixed environment); substitution of HP workstation in the real control room. From a software point of view, the project introduces some new technologies, like multi-threading, and the possibility to develop high level WSS applications with almost every programming language that implements the Berkley sockets. A library to develop java applications has also been created and tested.

  5. System engineering at the MEGARA project

    NASA Astrophysics Data System (ADS)

    Pérez-Calpena, A.; García-Vargas, María. Luisa; Gil de Paz, A.; Gallego Maestro, J.; Carrasco Licea, E.; Sánchez Moreno, F.; Iglesias-Páramo, J.

    2014-08-01

    MEGARA (Multi-Espectrógrafo en GTC de Alta Resolución para Astronomía) is a facility instrument of the 10.4m GTC (La Palma, Spain) working at optical wavelengths that provides both Integral-Field Unit (IFU) and Multi- Object Spectrograph (MOS) capabilities at resolutions in the range R=6,000-20,000. The MEGARA focal plane subsystems are located at one of the GTC focal stations, while the MEGARA refractive VPH based spectrograph is located at one of the Nasmyth platforms. The fiber bundles conduct the light from the focal plane subsystems to the pseudo-slits at the entrance of the spectrograph. The project is an initiative led by Universidad Complutense de Madrid (Spain) in collaboration with INAOE (Mexico), IAA-CSIC (Spain) and Universidad Politécnica de Madrid (Spain) and is developed under contract with GRANTECAN. The project is carried out by a multidisciplinary and geographically distributed team, which includes the in-kind contributions of the project partners and personnel from several private companies. The MEGARA system-engineering plan has been tailored to the project and is being applied to ensure the technical control of the project in order to finally meet the science high-level requirements and GTC constrains.

  6. Effects of Hemoglobin Variants on Hemoglobin A1c Values Measured Using a High-Performance Liquid Chromatography Method

    PubMed Central

    De-La-Iglesia, Silvia; Ropero, Paloma; Nogueira-Salgueiro, Patricia; Santana-Benitez, Jesus

    2014-01-01

    Hemoglobin A1c (HbA1c) is routinely used to monitor long-term glycemic control and for diagnosing diabetes mellitus. However, hemoglobin (Hb) gene variants/modifications can affect the accuracy of some methods. The potential effect of Hb variants on HbA1c measurements was investigated using a high-performance liquid chromatography (HPLC) method compared with an immunoturbimetric assay. Fasting plasma glucose (FPG) and HbA1c levels were measured in 42 371 blood samples. Samples producing abnormal chromatograms were further analyzed to characterize any Hb variants. Fructosamine levels were determined in place of HbA1c levels when unstable Hb variants were identified. Abnormal HPLC chromatograms were obtained for 160 of 42 371 samples. In 26 samples HbS was identified and HbA1c results correlated with FPG. In the remaining 134 samples HbD, Hb Louisville, Hb Las Palmas, Hb N-Baltimore, or Hb Porto Alegre were identified and HbA1c did not correlate with FPG. These samples were retested using an immunoturbidimetric assay and the majority of results were accurate; only 3 (with the unstable Hb Louisville trait) gave aberrant HbA1c results. Hb variants can affect determination of HbA1c levels with some methods. Laboratories should be aware of Hb variants occurring locally and choose an appropriate HbA1c testing method. PMID:25355712

  7. Aerosol properties over the western Mediterranean basin: temporal and spatial variability

    NASA Astrophysics Data System (ADS)

    Lyamani, H.; Valenzuela, A.; Perez-Ramirez, D.; Toledano, C.; Granados-Muñoz, M. J.; Olmo, F. J.; Alados-Arboledas, L.

    2015-03-01

    This study focuses on the analysis of Aerosol Robotic Network (AERONET) aerosol data obtained over Alborán Island (35.90° N, 3.03° W, 15 m a.s.l.) in the western Mediterranean from July 2011 to January 2012. Additional aerosol data from the three nearest AERONET stations (Málaga, Oujda and Palma de Mallorca) and the Maritime Aerosol Network (MAN) were also analyzed in order to investigate the temporal and spatial variations of aerosol over this scarcely explored region. High aerosol loads over Alborán were mainly associated with desert dust transport from North Africa and occasional advection of anthropogenic fine particles from central European urban-industrial areas. The fine particle load observed over Alborán was surprisingly similar to that obtained over the other three nearest AERONET stations, suggesting homogeneous spatial distribution of fine particle loads over the four studied sites in spite of the large differences in local sources. The results from MAN acquired over the Mediterranean Sea, Black Sea and Atlantic Ocean from July to November 2011 revealed a pronounced predominance of fine particles during the cruise period.

  8. Teleportation of entanglement over 143 km.

    PubMed

    Herbst, Thomas; Scheidl, Thomas; Fink, Matthias; Handsteiner, Johannes; Wittmann, Bernhard; Ursin, Rupert; Zeilinger, Anton

    2015-11-17

    As a direct consequence of the no-cloning theorem, the deterministic amplification as in classical communication is impossible for unknown quantum states. This calls for more advanced techniques in a future global quantum network, e.g., for cloud quantum computing. A unique solution is the teleportation of an entangled state, i.e., entanglement swapping, representing the central resource to relay entanglement between distant nodes. Together with entanglement purification and a quantum memory it constitutes a so-called quantum repeater. Since the aforementioned building blocks have been individually demonstrated in laboratory setups only, the applicability of the required technology in real-world scenarios remained to be proven. Here we present a free-space entanglement-swapping experiment between the Canary Islands of La Palma and Tenerife, verifying the presence of quantum entanglement between two previously independent photons separated by 143 km. We obtained an expectation value for the entanglement-witness operator, more than 6 SDs beyond the classical limit. By consecutive generation of the two required photon pairs and space-like separation of the relevant measurement events, we also showed the feasibility of the swapping protocol in a long-distance scenario, where the independence of the nodes is highly demanded. Because our results already allow for efficient implementation of entanglement purification, we anticipate our research to lay the ground for a fully fledged quantum repeater over a realistic high-loss and even turbulent quantum channel. PMID:26578764

  9. MEGARA cryostat advanced design

    NASA Astrophysics Data System (ADS)

    Ferrusca, D.; Castillo-Domínguez, Edgar; Velázquez, M.; Gil de Paz, A.; Carrasco, E.; Gallego, J.; Cedazo, R.; Iglesias-Páramo, J.

    2014-08-01

    MEGARA (Multi-Espectrógrafo en GTC de Alta Resolución para Astronomía) is an optical Integral-Field Unit and Multi-Object Spectrograph designed for the GTC (Gran Telescopio de Canarias) 10.4m telescope in La Palma. MEGARA project has already passed preliminary design review and the optics critical design review, first-light it is expected to take place at the end of 2016. MEGARA is a development under a GRANTECAN contract. In this paper we summarize the current status of the LN2 open-cycle cryostat which has been designed by the "Astronomical Instrumentation Lab for Millimeter Wavelengths" at the Instituto Nacional de Astrofísica, Óptica y Electrónica (INAOE) and emphasize the key parts of the system that have updated since the Preliminary Design, the main activities related to acceptance, integration, fabrication and maintenance plans which fit into the overall structure of the management plan of MEGARA are also described. The cryogenic work package of MEGARA has completed all the design stages and is ready for its Critical Design Review and then proceed to fabrication.

  10. Cloud tracked winds at the lower cloud level using Venus' night side observations at 2.28 μm with TNG/NICS

    NASA Astrophysics Data System (ADS)

    Machado, P.; Luz, D.; Oliveira, J.; Peralta, J.

    2015-10-01

    We present results based on observations carried out with the Near Infrared Camera and Spectrograph(NICS) of the Telescopio Nazionale Galileo (TNG), in La Palma, on July 2012. We observed for periods of 2.5 hours starting just before dawn, for three consecutive nights. We acquired a set of images of the night side of Venus with the continuum K filter at 2.28 microns, which allows to monitor motions at the lower cloud level of the atmosphere of Venus, close to 48 km altitude. Our objective has been to measure the horizontal wind field in order to characterize the latitudinal zonal wind profile, to study variability, to help constrain the effect of large scale planetary waves in the maintenance of superrotation, and to map the cloud distribution. These observations were part of the network of ground-based observations of Venus coordinated with ESA's Venus Express orbiter for the 2012 Venus transit campaign. Ground-based observa- tions are complementary to orbiter measurements, allowing simultaneous determination of the winds. We will present first results of cloud tracked winds from ground-based TNG observations and winds retrieved from coordinated space-based VEx/VIRTIS observations.

  11. PG 1700 + 518 - a low-redshift, broad absorption line QSO

    SciTech Connect

    Pettini, M.; Boksenberg, A.

    1985-07-01

    The first high-resolution optical spectra and lower resolution UV spectra of PG 1700 + 518, the only known broad-absorption-line (BAL) QSO at low emission redshift (0.288) are presented. The optical data were obtained with the Isaac Newton Telescope on the island of La Palma and the UV data with the International Ultraviolet Explorer satellite. The outstanding feature of the optical spectrum is a strong, broad Mg II absorption trough, detached from the Mg II emission line and indicative of ejection velocities of between 7000 and 18,000 km/s. Also detected were narrow (FWHM = 350 km/s) Mg II absorption lines at absolute z = 0.2698, which are probably related to the mass ejection phenomenon. It is concluded that the emission-line spectrum is similar to that of other low-redshift QSOs although there are some obvious differences from typical BAL QSOs, most notably in the unusually low level of ionization of both emission-line and broad absorption line gas. 21 references.

  12. [Influence of promotional material on hand hygiene in the safety culture of a tertiary hospital].

    PubMed

    Molina-Cabrillana, J; Dorta-Hung, M E; Otero Sanz, L; Henández Vera, J R; Martín-Rodríguez, M M; García de Carlos, P

    2016-06-01

    In order to increase safety culture about hand hygiene by means of messages and reminders about its importance in preventing nosocomial infections, we developed a new set of materials in the Complejo Hospitalario Universitario Insular Materno-Infantil of Las Palmas, Gran Canaria, constitued by two centres with 450 beds each and acredited for medical internal residents training. We hired a well-known caricaturist, who adapted the messages to the local way of speaking, by using characters that used to appear in his artwork in the local newspaper. Also, we continued to work with other graphic design professionals. We monitored adherence and consumption of products for hand rubbing. We noted an increase in both indicators in the following months after the implementation of this strategy. Moreover, we revised the infrastructures for hand hygiene, and were able to demonstrate improvements in most of the patient care areas. The material was well accepted by professionals, patients and visitors. No other interventions were made, so we think improvements can be attributable to this strategy in our setting. PMID:27157796

  13. HARPS-N: software path from the observation block to the image

    NASA Astrophysics Data System (ADS)

    Sosnowska, D.; Lodi, M.; Gao, X.; Buchschacher, N.; Vick, A.; Guerra, J.; Gonzalez, M.; Kelly, D.; Lovis, C.; Pepe, F.; Molinari, E.; Cameron, A. C.; Latham, D.; Udry, S.

    2012-09-01

    HARPS North is the twin of the HARPS (High Accuracy Radial velocity for Planetary Search) spectrograph operating in La Silla (Chile) recently installed on the TNG in La Palma observatory and used to follow-up, the "hot" candidates delivered by the Kepler satellite. HARPS-N is delivered with its own software that completely integrates with the TNG control system. A special care has been dedicated to develop tools that will assist the astronomers during the whole process of taking images: from the observation schedule to the raw image acquisition. All these tools are presented in the paper. In order to provide a stable and reliable system, the software has been developed keeping in mind concepts like failover and high-availability. HARPS-N is made of heterogeneous systems, from normal computer to real-time systems, that's why the standard message queue middleware (ActiveMQ) was chosen to provide the communications between different processes. The path of operations starting with the Observation Blocks and ending with the FITS frames is fully automated and could allow, in the future, the completely remote observing runs optimized for the time and quality constraints.

  14. Scientific and Technical Support for the Galileo Net Flux Radiometer Experiment

    NASA Technical Reports Server (NTRS)

    Sromovsky, Lawrence A.

    1997-01-01

    This report describes work in support of the Galileo Net Flux Radiometer (NFR), an instrument mounted on the Galileo probe, a spacecraft designed for entry into and direct measurements of Jupiter's atmosphere. Tasks originally proposed for the post launch period covered by NCC 2-854 are briefly as follows: attend and support PSG (Project Science Group) and other project science meetings; support in-flight checkouts; maintain and keep safe the spare instrument and GSE (Ground Support Equipment); organize and maintain documentation; finish NFR calibration measurements, documentation, and analysis; characterize and diagnose instrument anomalies; develop descent data analysis tools; and science data analysis and publication. Because we had the capability to satisfy a project support need we also subsequently proposed and were funded to make ground-based observations of Jupiter during the period surrounding the Galileo arrival at Jupiter, using the Swedish Solar Telescope at La Palma, Canary Islands. The following section provides background information on the NFR instrument. Section 3 contains the final report of work done.

  15. The effect of airborne dust on astronomical polarization measurements

    NASA Astrophysics Data System (ADS)

    Bailey, Jeremy; Ulanowski, Z.; Lucas, P. W.; Hough, J. H.; Hirst, E.; Tamura, M.

    2008-05-01

    In the past, it has generally been assumed that polarization observations made with ground-based telescopes are unaffected by the passage of light through the Earth's atmosphere. Here, we report observations with a new high-sensitivity astronomical polarimeter (PlanetPol) made during a Saharan dust event over the La Palma observatory in 2005 May that show excess linear polarization in the horizontal direction due to the passage of the starlight through the dust. The polarization reached a maximum value of 4.8 × 10-5 at 56° zenith distance and varied over five nights in proportion to the change in dust optical depth. Polarization of transmitted light (dichroism) does not occur for spherical or randomly oriented non-spherical particles. Thus, these results imply that some fraction of the dust grain population aligns with a preferred orientation. We use T-matrix models to demonstrate that the observed polarization direction implies a vertical orientation for the long axis of the particles. We suggest a possible mechanism for vertical orientation resulting from the electric field in the atmosphere. These results will need to be taken into account in the design and use of future instruments for high-sensitivity astronomical polarimetry. The results also indicate possible new approaches to studying aerosol particles and their effects on the Earth's atmosphere.

  16. The Marine Language Exchange Program: an International Approach to Ocean Sciences

    NASA Astrophysics Data System (ADS)

    Nowell, A.; Robigou, V.

    2004-12-01

    The ability of scientists to communicate across cultural and linguistic barriers is crucial for the global economic sustainability and protection of the world's oceans. Yet students with majors in the sciences and engineering constitute less than 2% of those who study abroad each year. And even fewer are students who study in countries where English is not the first language. The Marine Language Exchange program is a case study of an international and interdisciplinary collaboration between faculties in the languages and the sciences that address this gap. A consortium of U.S. and European institutions including University of Washington (Washington), Eckerd College (Florida), University of Hilo (Hawaii), Université de la Rochelle (France), Université de Liège (Belgium), and Universidad de Las Palmas (Spain) is developing a multilingual, marine sciences exchange program in an effort to internationalize their ocean sciences departments. The program includes a three-week, intensive "bridge" course designed to reinforce second language skills in the context of marine sciences, and prepare undergraduate students for the cultural and educational differences of their host country. Following this preparatory immersion experience students from each institution enroll in courses abroad for 6 to 12 months to study marine sciences for full academic credit. Different disciplinary approaches -Second Language Acquisition, English as a Second Language and Marine Science- prepare science students to contribute to the study and the management of the world\\'{}s oceans with an awareness of the cultural issues reflected by national marine policies.

  17. Determination of mercury in rice by MSFIA and cold vapour atomic fluorescence spectrometry.

    PubMed

    da Silva, Douglas G; Portugal, Lindomar A; Serra, Antonio M; Ferreira, Sergio L C; Cerdà, Victor

    2013-04-15

    In the present paper the use of a MSFIA system for determination of mercury in rice by cold vapour atomic fluorescence spectrometry (CV AFS) is proposed. The sample digestion is performed in a microwave oven using nitric acid and hydrogen peroxide. The experimental conditions for vapour generation were determined using a full two-level factorial design involving the following factors: nitric acid and tin chloride concentrations and sample flow rate. Employing the conditions optimised, the method allows the determination of mercury using the external calibration technique with aqueous standards. The reached limits of detection and quantification were 0.48 and 1.61 ng g⁻¹ respectively, and the precision (as relative standard deviation) was 3.28% and 1.56% for rice samples with a mercury content of 3.63 and 5.81 ng g⁻¹, respectively. The method accuracy was confirmed analysing a certified reference material of rice flour furnished by National Institute of Standard and Technology. The interference of nitrous acid and nitrous oxides are removed using potassium dichromate. The method was applied to mercury determination in twelve rice samples acquired in Palma de Mallorca (Spain) between the months of January and April of 2012. The mercury content found varied from 2.15 to 7.25 ng g⁻¹. These results agree with those reported by others authors.

  18. A dispersive liquid-liquid micellar microextraction for the determination of pharmaceutical compounds in wastewaters using ultra-high-performace liquid chromatography with DAD detection.

    PubMed

    Montesdeoca-Esponda, Sarah; Mahugo-Santana, Cristina; Sosa-Ferrera, Zoraida; Santana-Rodríguez, José Juan

    2015-03-01

    A dispersive liquid-liquid micellar microextraction (DLLMME) method coupled with ultra-high-performance liquid chromatography (UHPLC) using Diode Array Detector (DAD) detector was developed for the analysis of five pharmaceutical compounds of different nature in wastewaters. A micellar solution of a surfactant, polidocanol, as extraction solvent (100 μL) and chloroform as dispersive solvent (200 μL) were used to extract and preconcentrate the target analytes. Samples were heated above critical temperature and the cloudy solution was centrifuged. After removing the chloroform, the reduced volume of surfactant was then injected in the UHPLC system. In order to obtain high extraction efficiency, the parameters affecting the liquid-phase microextraction, such as time and temperature extraction, ionic strength and surfactant and organic solvent volume, were optimized using an experimental design. Under the optimized conditions, this procedure allows enrichment factors of up to 47-fold. The detection limit of the method ranged from 0.1 to 2.0 µg/L for the different pharmaceuticals. Relative standard deviations were <26% for all compounds. The procedure was applied to samples from final effluent collected from wastewater treatment plants in Las Palmas de Gran Canaria (Spain), and two compounds were measured at 67 and 113 µg/L in one of them. PMID:25056775

  19. Discovery of the optical polarization flare following the X-ray giant outburst of V0332+53.

    NASA Astrophysics Data System (ADS)

    Slowikowska, Agnieszka; Reig, Pablo; Krzeszowski, Krzysztof; Zejmo, M. Michal

    2016-07-01

    V0332+53 is a transient Be X-ray binary that went through a giant outburst between June 2015 and October 2015 registered by the Gamma-ray Burst Monitor (GMB) on board of the Fermi satellite. We present the discovery of a flare of linearly polarized optical light in V0332+53 that followed the X-ray outburst. We monitored the source with the multi-wavelength optical polarimeter RINGO3 on the 2-m fully robotic Liverpool Telescope located at the Observatorio del Roque de Los Muchachos on La Palma. RINGO3 measures polarization simultaneously in three spectral wavelength bands: blue (350-640 nm), green (650-760 nm) and red (770-1000 nm). The polarized optical flare went off around 90 days after the X-ray burst and lasted another 90 days in all three wavelength bands of RINGO3. Polarization degree reached up to 6% in blue and up to 4% in red, while the PA changed by more than 100 degrees during the flare. This is the first detection of optical polarization flare of high mass X-ray binary correlated with a preceding X-ray outburst. Our observations shed new light on the activities of X-ray binaries.

  20. VizieR Online Data Catalog: Northern Galactic OB stars vsini (Simon-Diaz+, 2014)

    NASA Astrophysics Data System (ADS)

    Simon-Diaz, S.; Herrero, A.

    2014-04-01

    The spectroscopic observations considered for this study are part of the IACOB spectroscopic database of northern Galactic OB stars (last described in Simon-Diaz et al., 2011, Bull. Soc. Roy. Sci. Liege, 80, 514 and Stellar Clusters and Associations: Proc. A RIA Workshop on Gaia, eds. E. J. Alfaro Navarro, A. T. Gallego Calvente, & M. R. Zapatero Osorio, 255). This unique high-quality spectroscopic database has been compiled in the framework of the IACOB project. To date, the IACOB database comprises 1250 spectra of 153 and 97 Galactic O- and early B-type stars, respectively, observable from the Roque de los Muchachos observatory in La Palma (Spain). The spectra have a resolving power of 46000 and 23000, a typical signal-to-noise ratio (S/N) above 150, and were compiled between November 2008 and January 2013 with the high-resolution FIbre-fed Echelle Spectrograph (FIES) attached to the Nordic Optical Telescope (NOT). The IACOB database has a multi-epoch character that enables investigations of the binary/multiple nature of considered stars and the temporal variations in individual objects with at least three spectra per observed target. In this study, we only used a subsample of the spectra, discarding all stars with signatures of multiplicity (which means that we only considered apparently single and SB1 stars), and only considering the spectrum with the highest S/N ratio per star. (5 data files).

  1. Basic cytogenetics and physical mapping of 5S and 18S ribosomal genes in Hoplias malabaricus (Osteichthyes, Characiformes, Erythrinidae) from isolated natural lagoons: a conserved karyomorph along the Iguaçu river basin.

    PubMed

    Gemi, Gisele; Lui, Roberto Laridondo; Treco, Fernando Rodrigo; Paiz, Leonardo Marcel; Moresco, Rafaela Maria; Margarido, Vladimir Pavan

    2014-01-01

    Erythrinidae include Neotropical teleost fish that are widely distributed in South America. Hoplias Gill, 1903 include two large groups: H. malabaricus Bloch, 1794 and H. lacerdae Miranda Ribeiro, 1908. Hoplias malabaricus is characterized by remarkable karyotype diversity, with some karyomorphs widely distributed geographically while others are more restricted to certain river basins. Cytogenetic analyzes were performed in a population of Hoplias malabaricus from the Wildlife Refuge of Campos de Palmas, the Iguaçu River basin. The specimens showed diploid number of 42 chromosomes (24m+18sm) without differentiated sex chromosomes system. The impregnation by silver nitrate showed multiple AgNORs. Seven pairs (4, 7, 10, 13, 16, 20 and 21) carrying 18S rDNA were detected by FISH. Heterochromatin was verified in the centromeric and pericentromeric region of most chromosomes and the terminal region of some pairs. FISH with 5S rDNA probes showed two chromosome pairs carrying these sites in the interstitial region (8 and 14). The data obtained in this study are similar to those found for two other populations of H. malabaricus already studied in the basin of the Iguaçu River, confirming the hypothesis that this species is natural, not having been introduced, as well as having an intrinsic characteristic, such as the largest number of sites of 18S rDNA.

  2. Climatology at the Roque de LOS Muchachos Observatory

    NASA Astrophysics Data System (ADS)

    Varela, Antonia M.; Muñoz-Tuñón, Casiana

    2009-09-01

    The Roque de los Muchachos Observatory (ORM) at La Palma (Canary Islands) is one of the two top pre-selected sites for hosting the future European Extremely Large Telescope (E-ELT), the other ones are Ventarrones (Chile), Macon (Argentine) and Aklim (Maroc). Meteorological and seeing conditions are crucial both for the site selection and for telescope design and feasibility studies for adaptive optics. The ELTs shall be very sensitive to wind behavior when operating in open air, therefore ground level wind velocity and wind gust are also required for the feasibility of the telescope construction. Here we analyze the wind speed and wind direction, the air temperature, the relative humidity and the barometric pressure statistical results obtained from data recorded at different sites at the ORM by several Automatic Weather Stations (AWS) since 1985, day and night time separately. Ground wind speed regimes (775mbar) are compared with those provided by satellites from 200 to 700mbar. There exists also observational evidence of the correlation between the seeing and the wind speed and wind direction that will be discussed in this work.

  3. Spatial and ecological population genetic structures within two island-endemic Aeonium species of different niche width.

    PubMed

    Harter, David E V; Thiv, Mike; Weig, Alfons; Jentsch, Anke; Beierkuhnlein, Carl

    2015-10-01

    The Crassulacean genus Aeonium is a well-known example for plant species radiation on oceanic archipelagos. However, while allopatric speciation among islands is documented for this genus, the role of intra-island speciation due to population divergence by topographical isolation or ecological heterogeneity has not yet been addressed. The aim of this study was to investigate intraspecific genetic structures and to identify spatial and ecological drivers of genetic population differentiation on the island scale. We analyzed inter simple sequence repeat variation within two island-endemic Aeonium species of La Palma: one widespread generalist that covers a large variety of different habitat types (Ae. davidbramwellii) and one narrow ecological specialist (Ae. nobile), in order to assess evolutionary potentials on this island. Gene pool differentiation and genetic diversity patterns were associated with major landscape structures in both species, with phylogeographic implications. However, overall levels of genetic differentiation were low. For the generalist species, outlier loci detection and loci-environment correlation approaches indicated moderate signatures of divergent selection pressures linked to temperature and precipitation variables, while the specialist species missed such patterns. Our data point to incipient differentiation among populations, emphasizing that ecological heterogeneity and topographical structuring within the small scales of an island can foster evolutionary processes. Very likely, such processes have contributed to the radiation of Aeonium on the Canary Islands. There is also support for different evolutionary mechanisms between generalist and specialist species.

  4. VizieR Online Data Catalog: Stellar nuclei and bulges of nearby S0 galaxies (Sil'chenko, 2016)

    NASA Astrophysics Data System (ADS)

    Sil'Chenko, O. K.

    2016-09-01

    The integral-field spectrograph Spectrographic Areal Unit for Research on Optical Nebulae (SAURON) was operating at the 4.2m William Herschel Telescope belonging to the ING of telescopes on La Palma. It worked in "TIGER mode", giving about 1500 spectra simultaneously, each for a 0.94''*0.94'' square element ("spaxel") from a (central) part of a galaxy. A total set of spectra covers an area of 41''*33''. The spectral range of the unit is rather narrow, 4800-5350Å, and its spectral resolution has been fixed since 2007 at about 4.3Å. There were two surveys of nearby early-type galaxies with SAURON. The first one, which started in 1999 and finished in 2004, involved 72 galaxies, among those 48 early-type ones and 24 spirals (de Zeeuw et al. 2002MNRAS.329..513D). The second one undertaken in 2007-2008 added more early-type galaxies, including dwarfs, to complete the volume-limited (D<42Mpc) sample (Cappellari et al. 2011, Cat. J/MNRAS/413/813). The total sample of early-type galaxies investigated in these two surveys includes 260 objects, and 200 of them are lenticular galaxies. For my analysis I have selected a subsample of 143 S0 galaxies that were observed in 2007-2008. (2 data files).

  5. Calibrating the PAU Survey's 46 Filters

    NASA Astrophysics Data System (ADS)

    Bauer, A.; Castander, F.; Gaztañaga, E.; Serrano, S.; Sevilla, N.; Tonello, N.; PAU Team

    2016-05-01

    The Physics of the Accelerating Universe (PAU) Survey, being carried out by several Spanish institutions, will image an area of 100-200 square degrees in 6 broad and 40 narrow band optical filters. The team is building a camera (PAUCam) with 18 CCDs, which will be installed in the 4 meter William Herschel Telescope at La Palma in 2013. The narrow band filters will each cover 100Å, with the set spanning 4500-8500Å. The broad band set will consist of standard ugriZy filters. The narrow band filters will provide low-resolution (R˜50) photometric "spectra" for all objects observed in the survey, which will reach a depth of ˜24 mag in the broad bands and ˜22.5 mag (AB) in the narrow bands. Such precision will allow for galaxy photometric redshift errors of 0.0035(1+z), which will facilitate the measurement of cosmological parameters with precision comparable to much larger spectroscopic and photometric surveys. Accurate photometric calibration of the PAU data is vital to the survey's science goals, and is not straightforward due to the large and unusual filter set. We outline the data management pipelines being developed for the survey, both for nightly data reduction and coaddition of multiple epochs, with emphasis on the photometric calibration strategies. We also describe the tools we are developing to test the quality of the reduction and calibration.

  6. Exoplanet detection via microlensing with RoboNet-1.0

    NASA Astrophysics Data System (ADS)

    Burgdorf, M. J.; Bramich, D. M.; Dominik, M.; Bode, M. F.; Horne, K. D.; Steele, I. A.; Rattenbury, N.; Tsapras, Y.

    2007-04-01

    RoboNet-1.0 is a prototype global network of three two-meter robotic telescopes, placed in La Palma (Canary Islands), Maui (Hawaii), and Siding Spring (Australia). In April 2004, funding for RoboNet-1.0 until July 2007 was approved by PPARC's Science Committee, and the project commenced in earnest in August 2004. The search for cool extra-solar planets by optimised robotic monitoring of Galactic microlensing events is one of the two core elements of its scientific programme - observations of gamma-ray bursts is the other. During the 2005 observing season, light curves of more than 60 microlensing events have been sampled at regular intervals. One particular event, OGLE-2005-BLG-71, showed an anomaly caused by an extrasolar planet, which constituted the second detection of a planet by microlensing. As a by-product, our dense monitoring during caustic crossing events can resolve the brightness profile of observed source stars, providing an observational test of stellar atmosphere models. Current development work uses e-science to create a fully automated chain linking event monitoring to the detection of anomalies in the microlensing lightcurves that could be indications of planetary companions and on to the triggering of follow-up observations. In order to fully exploit the potential of such a network for detecting exoplanets, it will be necessary to complement the existing RoboNet with additional telescopes in the southern hemisphere.

  7. Exoplanet Detection With RoboNet

    NASA Astrophysics Data System (ADS)

    Burgdorf, M. J.; RoboNet Microlens Planet Search Team

    2005-08-01

    RoboNet-1.0 is a prototype global network of three large (2m) robotic telescopes, placed in La Palma (Canary Islands), Maui (Hawaii), and Siding Spring (Australia). The detection of cool extra-solar planets by optimised robotic monitoring of Galactic microlens events is one of the two core elements of its scientific programme - observations of Gamma Ray Bursts is the other. Two dozen microlensing events have been observed in regular intervals already. The light curve of one particular event, OGLE 2005-BLG-71, that was measured by several groups including RoboNet, turned out to have an anomaly caused by an extrasolar planet. This was only the second detection of such an object with the microlensing technique. Current development work uses e-science to create a fully automated chain from event monitoring over the detection of anomalies to the triggering of follow-up observations. In order to fully exploit the potential of such a network for detecting exoplanets it will be necessary to complement the existing RoboNet with additional telescopes in the Southern hemisphere. Funding for RoboNet-1.0 was approved in April 2004 by PPARC's Science Committee and the project commenced in earnest in August 2004.

  8. Bokeh mirror alignment for Cherenkov telescopes

    NASA Astrophysics Data System (ADS)

    Ahnen, M. L.; Baack, D.; Balbo, M.; Bergmann, M.; Biland, A.; Blank, M.; Bretz, T.; Bruegge, K. A.; Buss, J.; Domke, M.; Dorner, D.; Einecke, S.; Hempfling, C.; Hildebrand, D.; Hughes, G.; Lustermann, W.; Mannheim, K.; Mueller, S. A.; Neise, D.; Neronov, A.; Noethe, M.; Overkemping, A.-K.; Paravac, A.; Pauss, F.; Rhode, W.; Shukla, A.; Temme, F.; Thaele, J.; Toscano, S.; Vogler, P.; Walter, R.; Wilbert, A.

    2016-09-01

    Imaging Atmospheric Cherenkov Telescopes (IACTs) need imaging optics with large apertures and high image intensities to map the faint Cherenkov light emitted from cosmic ray air showers onto their image sensors. Segmented reflectors fulfill these needs, and composed from mass production mirror facets they are inexpensive and lightweight. However, as the overall image is a superposition of the individual facet images, alignment remains a challenge. Here we present a simple, yet extendable method, to align a segmented reflector using its Bokeh. Bokeh alig nment does not need a star or good weather nights but can be done even during daytime. Bokeh alignment optimizes the facet orientations by comparing the segmented reflectors Bokeh to a predefined template. The optimal Bokeh template is highly constricted by the reflector's aperture and is easy accessible. The Bokeh is observed using the out of focus image of a near by point like light source in a distance of about 10 focal lengths. We introduce Bokeh alignment on segmented reflectors and demonstrate it on the First Geiger-mode Avalanche Cherenkov Telescope (FACT) on La Palma, Spain.

  9. Study of FK Comae Berenices. I. Surface images for 1994 and 1995

    NASA Astrophysics Data System (ADS)

    Korhonen, H.; Berdyugina, S. V.; Hackman, T.; Duemmler, R.; Ilyin, I. V.; Tuominen, I.

    1999-06-01

    We present new surface images of FK Com for August 1994 and July 1995. For the 1995 images two different inversion methods, Tikhonov regularization and the Occamian approach, are used to check the dependence on the formal assumptions. The images are found to be very similar when the same local line profiles, models, stellar parameters and observations are used as inputs for both methods. The validity of the maps and their temperature scales are independently checked with photometric observations. The maps for both years show active regions of very similar substructures and latitudes. It seems that the same spot group has survived on the surface of FK Com for the 11 months between the observations; however, during that time it has moved about 0.2 in phase. The movement and evolution of the spot groups seem to cause the photometrically observed ``flip-flop'' phenomenon, which is noticed to be repeated with an average period of 6.5 years, similar to some RS CVn-stars. Based on the observations obtained at the Nordic Optical Telescope, Observatorio Roque de los Muchachos, La Palma, Canary Islands, Spain.

  10. The active RS Canum Venaticorum binary II Pegasi. IV. The SPOT activity cycle

    NASA Astrophysics Data System (ADS)

    Berdyugina, S. V.; Berdyugin, A. V.; Ilyin, I.; Tuominen, I.

    1999-10-01

    A total of 6 new surface images of II Peg obtained for the years 1997 and 1998 confirms the recently revealed permanent active longitude structure. The lower limit of the active longitudes' lifetime is now extended up to 25 years. A new ``flip-flop'' phenomenon, redefined as a switch of the activity between the active longitudes, has started in summer of 1998. It coincides reasonably well with the moment predicted from the activity cycle of the star. This confirms definitely the cyclic behaviour of the activity of II Peg we recently discovered. Therefore, we assign numbers to the cycles of 4.65 yr since the earliest photoelectric observations of II Peg and define the active longitudes as ``odd'' and ``even'' corresponding to odd and even numbers of cycles. With such a definition, in late 1998 the 7th cycle began and the ``odd'' active longitude became more active. From the analysis of the spot area evolution within the active longitudes we conclude that the activity cycle is developed as a rearrangement of the nearly constant amount of the spot area between the active longitudes. We discuss the ``flip-flop'' phenomenon as a tracer of stellar activity and the role of the unseen secondary in establishing the cycle. Based on observations collected at the Nordic Optical Telescope (NOT), La Palma, Spain; the 1.25m telescope of the Crimean Astrophysical Observatory, Ukraine; the Phoenix 10 robotic telescope, APT Observatory, Arizona, USA.}

  11. VizieR Online Data Catalog: Taxonomy of potentially hazardous asteroids (Perna+, 2016)

    NASA Astrophysics Data System (ADS)

    Perna, D.; Dotto, E.; Ieva, S.; Barucci, M. A.; Bernardi, F.; Fornasier, S.; de Luise, F.; Perozzi, E.; Rossi, A.; Epifani, E. M.; Micheli, M.; Deshapriya, J. D. P.

    2016-07-01

    Observations of 14 Potentially Hazardous Asteroids (PHAs) were carried out at the 3.6-m Telescopio Nazionale Galileo (TNG, La Palma, Spain), the ESO 3.6-m New Technology Telescope (NTT, La Silla, Chile), and the NASA 3.0-m Infrared Telescope Facility (IRTF, Mauna Kea, USA). The observational circumstances, as well as the instrumentation used are given in Table1. According to the population model by Mainzer et al. (2012ApJ...752..110M), ~4700+/-1450 PHAs are expected to exist. To further investigate the PHA population as a whole, and in particular to verify how the different taxonomic types are distributed with respect to other physical and dynamical properties, we combined our results with the available literature. We started retrieving the European Asteroid Research Node (EARN; http://earn.dlr.de/; retrieved on 2015 April 28) database of Near-Earth Object (NEO) physical properties, selecting those 255 Potentially Hazardous Asteroids (PHAs) with published taxonomic classifications. Of our 14 targets, 7 are classified in the present work for the first time, for a total sample of 262 targets to be considered in our analysis (see Table4). The results for our remaining seven targets are in agreement with the literature. (2 data files).

  12. The GAPS programme with HARPS-N at TNG. VI. The curious case of TrES-4b

    NASA Astrophysics Data System (ADS)

    Sozzetti, A.; Bonomo, A. S.; Biazzo, K.; Mancini, L.; Damasso, M.; Desidera, S.; Gratton, R.; Lanza, A. F.; Poretti, E.; Rainer, M.; Malavolta, L.; Affer, L.; Barbieri, M.; Bedin, L. R.; Boccato, C.; Bonavita, M.; Borsa, F.; Ciceri, S.; Claudi, R. U.; Gandolfi, D.; Giacobbe, P.; Henning, T.; Knapic, C.; Latham, D. W.; Lodato, G.; Maggio, A.; Maldonado, J.; Marzari, F.; Martinez Fiorenzano, A. F.; Micela, G.; Molinari, E.; Mordasini, C.; Nascimbeni, V.; Pagano, I.; Pedani, M.; Pepe, F.; Piotto, G.; Santos, N.; Scandariato, G.; Shkolnik, E.; Southworth, J.

    2015-03-01

    We update the TrES-4 system parameters using high-precision HARPS-N radial-velocity measurements and new photometric light curves. A combined spectroscopic and photometric analysis allows us to determine a spectroscopic orbit with a semi-amplitude K = 51 ± 3 m s-1. The derived mass of TrES-4b is found to be Mp = 0.49 ± 0.04 MJup, significantly lower than previously reported. Combined with the large radius () inferred from our analysis, TrES-4b becomes the transiting hot Jupiter with the second-lowest density known. We discuss several scenarios to explain the puzzling discrepancy in the mass of TrES-4b in the context of the exotic class of highly inflated transiting giant planets. Based on observations made with the Italian Telescopio Nazionale Galileo (TNG) operated on the island of La Palma by the Fundacion Galileo Galilei of the INAF at the Spanish Observatorio del Roque de los Muchachos of the IAC in the frame of the program Global Architecture of Planetary Systems (GAPS), and with the Zeiss 1.23-m telescope at the German-Spanish Astronomical Center at Calar Alto, Spain. Tables 1 and 3 are available in electronic form at http://www.aanda.org

  13. Value addition of Palmyra palm and studies on the storage life.

    PubMed

    Chaurasiya, A K; Chakraborty, I; Saha, J

    2014-04-01

    Palmyra palm (Borassus flabellifer L.) belonging to the family Palmae is referred to as tree of life with several uses including food, beverage, fibre, medicinal and timber. Unfortunately, the nutritionally enriched pulp of ripened palm has limited commercial use. Extraction of pulp has been accomplished by using water and heat to ensure maximum pulp recovery. Different recipes were tried for the preparation of two uncommon value added products like palm spread and palm toffee. On the basis of biochemical composition, organoleptic scores, microbial estimation and storage study both under ambient and refrigerated conditions; the suitable recipe was selected with the maximum acceptability. Gradual increase in total soluble solid (TSS), total sugar and reducing sugar while decrease in ascorbic acid, pH, β-carotene and protein content of processed products have been observed irrespective of storage condition. The results obtained from sensory evaluation and microbial status revealed that palm spread and toffee remained acceptable up to 9 months and 8 months, respectively at ambient temperature. The income per rupee investment for these two products was found to be remunerative. PMID:24741173

  14. An overview of the CILBO spectral observation program

    NASA Astrophysics Data System (ADS)

    Rudawska, R.; Zender, J.; Koschny, D.

    2016-01-01

    The video equipment can be easily adopted with a spectral grating to obtain spectral information from meteors. Therefore, in recent years spectroscopic observations of meteors have become quite popular. The Meteor Research Group (MRG) of the European Space Agency has been working on upgrating the analysis of meteor spectra as well, operating image-intensified camera with objective grating (ICC8). ICC8 is located on Tenerife station of the double-station camera setup CILBO (Canary Island Long-Baseline Observatory). The pipeline software processes data with the standard calibration procedure (dark current, flat field, lens distortion corrections). While using the position of a meteor recorded by ICC7 camera (zero order), the position of the 1st order spectrum as a function of wavelength is computed Moreover, thanks to the double meteor observations carried by ICC7 (Tenerife) and ICC9 (La Palma), trajectory of a meteor and its orbit is determined. Which merged with simultaneously measurement of meteor spectrum from ICC8, allow us to identify the source of the meteoroid. Here, we report on preliminary results from a sample of meteor spectra collected by CILBO-ICC8 camera since 2012.

  15. Ground-based Solar Observations and Plasma Bubbles in Brazilian Sector During a Period of Extreme Low Solar Activity

    NASA Astrophysics Data System (ADS)

    Tardelli-Coelho, F.; Abalde, J. R.; Tardelli, A.; de Abreu, A. J.

    2016-04-01

    Studies presented on the relation of the Sun-Earth system are currently of great importance. Ionospheric irregularities in the F-region, caused by geomagnetic storms have significant and adverse effects on the Earth. The recent advancement in technological techniques for monitoring space weather has facilitated these studies. The focus of this study was to determine whether a geomagnetic storm interfered with the generation, propagation, and durability of plasma bubbles that occurred over a period of solar minimum in two cities in the Brazilian sector, São José dos Campos - SP, designated SJC, (23.21°S, 45.86°W; dip latitude 17.6°S), low-latitude region and near the south crest of the ionospheric equatorial anomaly; and Palmas - TO, called PAL (10.28°S, 48.33°W; dip latitude 6.7°S), near the magnetic equator, located in the geographical South, tropical region and the hemisphere opposite the magnetic equator. This study was conducted with data analysis of five years (2006-2010) for SJC and four years (2007-2010) for PAL, considering the 24th solar cycle, using an all-sky imaging photometer operating with interference filters in OI 630.0 nm emission resulting from dissociative recombination process that occurs at an altitude of 250-300 km (F-region).

  16. SmartPort: A Platform for Sensor Data Monitoring in a Seaport Based on FIWARE.

    PubMed

    Fernández, Pablo; Santana, José Miguel; Ortega, Sebastián; Trujillo, Agustín; Suárez, José Pablo; Domínguez, Conrado; Santana, Jaisiel; Sánchez, Alejandro

    2016-01-01

    Seaport monitoring and management is a significant research area, in which infrastructure automatically collects big data sets that lead the organization in its multiple activities. Thus, this problem is heavily related to the fields of data acquisition, transfer, storage, big data analysis and information visualization. Las Palmas de Gran Canaria port is a good example of how a seaport generates big data volumes through a network of sensors. They are placed on meteorological stations and maritime buoys, registering environmental parameters. Likewise, the Automatic Identification System (AIS) registers several dynamic parameters about the tracked vessels. However, such an amount of data is useless without a system that enables a meaningful visualization and helps make decisions. In this work, we present SmartPort, a platform that offers a distributed architecture for the collection of the port sensors' data and a rich Internet application that allows the user to explore the geolocated data. The presented SmartPort tool is a representative, promising and inspiring approach to manage and develop a smart system. It covers a demanding need for big data analysis and visualization utilities for managing complex infrastructures, such as a seaport. PMID:27011192

  17. Periodic and quiescent solar activity effects in the low ionosphere, using SAVNET data

    NASA Astrophysics Data System (ADS)

    Bertoni, F. C. P.; Raulin, J.-P.; Gavilan, H. R.; Kaufmann, P.; Raymundo, T. E.

    2010-10-01

    Important results have been acquired using the measurements of VLF amplitude and phase signals from the South America VLF Network (SAVNET) stations. This network is an international project coordinated by CRAAM, Brazil in cooperation with Peru and Argentina. It started operating in April 2006, and now counts on eight stations (Atibaia, Palmas, Santa Maria and Estaça~o Antártica Comandante Ferraz in Brazil; Piura, Punta-Lobos and Ica, in Peru; CASLEO, in Argentina). Researches, through the last decades, have demonstrated the versatility of the VLF technique for many scientific and technological purposes. In this work, we summarize some recent results using SAVNET data base. We have obtained daily maximum diurnal amplitude time series that exhibited behavior patterns in different time scales: 1) 1ong term variations indicating the solar activity level control of the low ionosphere; 2) characteristic periods of alternated slow and fast variations, the former being related to solar illumination conditions, and the latter that have been associated with the winter anomaly at high latitudes; 3) 27-days period related to the solar rotation and consequently associated to the solar Lyman-α radiation flux variations, reinforcing earlier theories about the importance of this spectral line for the D-region formation. Finally, we conclude presenting preliminary results of simulation using LWPC, which showed very good agreement at times of observed modal amplitude minima for a given VLF propagation path.

  18. Characterisation of microsatellite loci in two species of lice, Polyplax serrata (Phthiraptera: Anoplura: Polyplacidae) and Myrsidea nesomimi (Phthiraptera: Amblycera: Menoponidae).

    PubMed

    Martinu, Jana; Roubova, Veronika; Novakova, Milena; Smith, Vincent S; Hypsa, Vaclav; Stefka, Jan

    2015-01-01

    Polymorphic microsatellite loci were characterised for two louse species, the anopluran Polyplax serrata Burmeister, 1839, parasitising Eurasian field mice of the genus Apodemus Kaup, and the amblyceran Myrsidea nesomimi Palma et Price, 2010, found on mocking birds endemic to the Galápagos Islands. Evolutionary histories of the two parasites show complex patterns influenced both by their geographic distribution and through coevolution with their respective hosts, which renders them prospective evolutionary models. In P. serrata, 16 polymorphic loci were characterised and screened across 72 individuals from four European populations that belong to two sympatric mitochondrial lineages differing in their breadth of host-specificity. In M. nesomimi, 66 individuals from three island populations and two host species were genotyped for 15 polymorphic loci. The observed heterozygosity varied from 0.05 to 0.9 in P. serrata and from 0.0 to 0.96 in M. nesomimi. Deviations from the Hardy-Weinberg equilibrium were frequently observed in the populations of both parasites. Fst distances between tested populations correspond with previous phylogenetic data, suggesting the microsatellite loci are an informative resource for ecological and evolutionary studies of the two parasites.

  19. VizieR Online Data Catalog: Spectroscopy of nearby late-type stars (Maldonado+, 2010)

    NASA Astrophysics Data System (ADS)

    Maldonado, J.; Martinez-Arnaiz, R. M.; Eiroa, C.; Montes, D.; Montesinos, B.

    2010-06-01

    File table1 contains the name of the observed stars, coordinates, astrometric data, radial velocities and notes. Parallaxes are taken from van Leeuwen (2007, Cat. I/311) and proper motions from (2000, Cat. I/259). Radial velocities were derived from high-resolution spectra taken with the FOCES spectrograph at the Calar Alto observatory (Almeria, Spain) and the SARG spectrograph at the Telescopio Nazionale Galileo in La Palma (Canary Islands, Spain). Additional spectra from the public library "S4N" (Allende Prieto et al., 2004, Cat. J/A+A/420/183) were also used. Radial velocities were measured by cross-correlating the spectra of our programme stars with spectra of radial velocity standard stars taken from Barnes et al. (1986PASP...98..223B), Beavers et al. (1979PASP...91..698B), and Udry et al. (1999ASPC..185..383U, 1999ASPC..185..367U). For known spectroscopic binaries the radial velocity of the centre of mass of the system is given. These values are from Pourbaix et al. (Cat. B/sb9/) or Eker et al. (2008, Cat. V/128 ). Previous radial velocities reported in the literature are also given for comparison. (1 data file).

  20. Spurious behavior in volcanic records of geomagnetic field reversals

    NASA Astrophysics Data System (ADS)

    Carlut, Julie; Vella, Jerome; Valet, Jean-Pierre; Soler, Vicente; Legoff, Maxime

    2016-04-01

    Very large directional variations of magnetization have been reported in several lava flows recording a geomagnetic reversal. Such behavior could reflect real geomagnetic changes or be caused by artifacts due to post-emplacement alteration and/or non-ideal magnetic behavior. More recently, a high resolution paleomagnetic record from sediments pleads also for an extremely rapid reversal process during the last reversal. Assuming that the geomagnetic field would have moved by tens of degrees during cooling of moderate thickness lava flows implies brief episodes of rapid changes by a few degrees per day that are difficult to reconcile with the rate of liquid motions at the core surface. Systematical mineralogical bias is a most likely explanation to promote such behavior as recently reconsidered by Coe et al., 2014 for the rapid field changes recorded at Steens Mountain. We resampled three lava flows at La Palma island (Canarias) that are sandwiched between reverse polarity and normal polarity flows associated with the last reversal. The results show an evolution of the magnetization direction from top to bottom. Thermal demagnetization experiments were conducted using different heating and cooling rates. Similarly, continuous demagnetization and measurements. In both cases, we did not notice any remagnetization associated with mineralogical transformations during the experiments. Magnetic grain sizes do not show any correlation with the amplitude of the deviations. Microscopic observations indicate poor exsolution, which could suggests post-cooling thermochemical remagnetization processes.

  1. Agronomic performance of arabica coffee genotypes in northwest Rio de Janeiro State.

    PubMed

    Rodrigues, W P; Vieira, H D; Barbosa, D H S G; Sousa Filho, G R; Partelli, F L

    2014-07-25

    Considering the productive potential of arabica coffee in the Rio de Janeiro State and the shortage of breeding programs for this species in the state, this study aimed to evaluate the vegetative and productive characteristics of 25 arabica coffee genotypes to indicate 1 or more varieties for the northwest Rio de Janeiro region. The experiment was in Varre e Sai, RJ, Brazil, and plants were planted in 2007 with a spacing of 2.5 x 0.8 m. Five plots were used, consisting of 8 plants per plot to measure vegetative growth, height, stem diameter, and plagiotropic branch number characteristics and productivity in the biennia 2009/2010 and 2011/2012. The classification by sieve was performed at harvest in 2011. The variables were subjected to analysis of variance and means grouped by the Scott Knott test at 5% probability, and the productivity was subjected to joint analysis of variance. Pearson's correlation coefficients between growth and productivity variables were estimated. The best genotypes were Catucaí Amarelo 2 SL, Catiguá MG 02, Acauã, Palma II, Sabiá 398, IPR 103, IPR 100, Catucaí Amarelo 24/137, and Catucaí Amarelo 20/15.

  2. FastCam: a new lucky imaging instrument for medium-sized telescopes

    NASA Astrophysics Data System (ADS)

    Oscoz, Alejandro; Rebolo, Rafael; López, Roberto; Pérez-Garrido, Antonio; Pérez, Jorge Andrés; Hildebrandt, Sergi; Rodríguez, Luis Fernando; Piqueras, Juan José; Villó, Isidro; González, José Miguel; Barrena, Rafael; Gómez, Gabriel; García-Hernández, D. Aníbal; Montañés, Pilar; Rosenberg, Alfred; Cadavid, Emilio; Calcines, Ariadna; Díaz-Sánchez, Anastasio; Kohley, Ralf; Martín, Yolanda; Peñate, José; Sánchez, Vicente

    2008-07-01

    FastCam is an instrument jointly developed by the Spanish Instituto de Astrofísica de Canarias and the Universidad Politécnica de Cartagena designed to obtain high spatial resolution images in the optical wavelength range from ground-based telescopes. The instrument consists of a very low noise and very fast readout speed EMCCD camera capable of reaching the diffraction limit of medium-sized telescopes from 500 to 850 nm. FastCam incorporates a FPGAs-based device to save and evaluate those images minimally disturbed by atmospheric turbulence in real time. The undisturbed images represent a small fraction of the observations. Therefore, a special software package has been developed to extract, from cubes of tens of thousands of images, those with better quality than a given level. This is done in parallel with the data acquisition at the telescope. After the first tests in the laboratory, FastCam has been successfully tested in three telescopes: the 1.52-meter TCS (Teide Observatory), the 2.5-meter NOT, and the 4.2-meter WHT (Roque de los Muchachos Observatory). The theoretical diffraction limit of each telescope has been reached in the I band (850 nm) -0.15, 0.08 and 0.05 arcsec, respectively-, and similar resolutions have been also obtained in the V and R bands. Future work will include the development of a new instrument for the 10.4-meter GTC telescope on La Palma.

  3. HTTP-based remote operational options for the Vacuum Tower Telescope, Tenerife

    NASA Astrophysics Data System (ADS)

    Staiger, J.

    2012-09-01

    We are currently developing network based tools for the Vacuum Tower Telescope (VTT), Tenerife which will allow to operate the telescope together with the newly developed 2D-spectrometer HELLRIDE under remote control conditions. The computational configuration can be viewed as a distributed system linking hardware components of various functionality from different locations. We have developed a communication protocol which is basically an extension of the HTTP standard. It will serve as a carrier for command- and data-transfers. The server-client software is based on Berkley-Unix sockets in a C++ programming environment. A customized CMS will allow to create browser accessible information on-the-fly. Java-based applet pages have been tested as optional user access GUI's. An access tool has been implemented to download near-realtime, web-based target information from NASA/SDO. Latency tests have been carried out at the VTT and the Swedish STT at La Palma for concept verification. Short response times indicate that under favorable network conditions remote interactive telescope handling may be possible. The scientific focus of possible future remote operations will be set on the helioseismology of the solar atmosphere, the monitoring of flares and the footpoint analysis of coronal loops and chromospheric events.

  4. Latest MAGIC discoveries pushing redshift boundaries in VHE Astrophysics

    NASA Astrophysics Data System (ADS)

    Manganaro, M.; Becerra, J.; Nievas, M.; Sitarek, J.; Tavecchio, F.; Buson, S.; Dominis, D.; Domínguez, A.; Lindfors, E.; Mazin, D.; Moralejo, A.; Stamerra, A.; Vovk, Ie; ">MAGIC, Palma, has been able to go beyond that limit and push the boundaries for VHE detection to redshifts z ~ 1. The two sources detected and analyzed, the blazar QSO B0218+357 and the FSRQ PKS 1441+25 are located at redshift z = 0.944 and z = 0.939 respectively. QSO B0218+357 is also the first gravitational lensed blazar ever detected in VHE. The activity, triggered by Fermi-LAT in high energy γ-rays, was followed up by other instruments, such as the KVA telescope in the optical band and the Swift-XRT in X-rays. In the present work we show results on MAGIC analysis on QSO B0218+357 and PKS 1441+25 together with multiwavelength lightcurves. The collected dataset allowed us to test for the first time the present generation of EBL models at such distances.

  5. Propagation experiments in the near infrared along a 150-km path and from stars in the Canarian archipelago

    NASA Astrophysics Data System (ADS)

    Comeron, Adolfo; Rubio, Juan A.; Belmonte, Aniceto M.; Garcia, Enrique; Prud'homme, Tony; Sodnik, Zoran; Connor, Chris

    2002-03-01

    Within the framework of the European Space Agency (ESA) SILEX project, aimed at experimentally demonstrating the feasibility of inter-satellite optical communications links, an Optical Ground Station (OGS) has been built by ESA in the premises of the Instituto de Astrofisica de Canarias (IAC, Institute of Astrophysics of the Canary Islands) Observatory of Teide, in the Tenerife island. The OGS is designed to test the optical communications payload on board the ESA's Artemis satellite and to perform ground-satellite optical communications experiments. As part of the OGS design study, an assessment of the impact of the atmosphere on the ground- satellite links was carried out. This assessment included experimental characterizations of the atmospheric effects through both measurements from stars in positions close to the Artemis one in bands comprising the SILEX wavelengths, using the IAC's Mons telescope in the Observatory of Teide, and measurements on a horizontal link with a transmitter near the IAC's Roque de los Muchachos Observatory in La Palma island, based on a laser diode similar to those to be used in SILEX, and a receiver in the Teide Observatory, almost 150 km apart, in the Tenerife island. The 830-nm wavelength horizontal measurements allowed checking the variations in the behavior of the atmospheric turbulence through the diurnal cycle. Besides the information relevant to assess the OGS performance, the horizontal-propagation experiments allowed to gather a considerable amount of propagation data on a very long path, most of it 2400 m above the sea.

  6. A Clinical Librarian-Nursing Partnership to Bridge Clinical Practice and Research in an Oncology Setting.

    PubMed

    Ginex, Pamela K; Hernandez, Marisol; Vrabel, Mark

    2016-09-01

    Nurses today work in practice settings where the expectation is to "draw upon the best evidence to provide the care most appropriate to each patient" (Olsen, Goolsby, & McGinnis, 2009, p. 10) while caring for patients with high acuity in highly specialized settings. Within the nursing profession, the Magnet Recognition Program® advocates for exemplary professional practice and the generation of new knowledge through research and clinical innovation. Nurses working in a clinical setting are often the best resource to identify important clinical questions and gaps in practice, but a lack of resources presents challenges to nurses in fully developing their questions and identifying the most appropriate methods to answer them. These challenges often fall into three broad categories: individual nurse characteristics, organizational characteristics, and environmental characteristics (Dobbins, Ciliska, Cockerill, Barnsley, & DiCenso, 2002). Creating a dedicated partnership between nurses and library staff is one method that can overcome these challenges to use existing resources and support nurses who are asking and answering important clinical questions (DePalma, 2005; Vrabel, 2005). 
. PMID:27541547

  7. UCM Meteor and Fireball Research group: Results 2012--2014

    NASA Astrophysics Data System (ADS)

    Ocaña, F.; Sánchez de Miguel, A.; Zamorano, J.; Izquierdo, J.; Pascual, S.; Palos, M. F.; Oré, S.; Rodríguez-Coira, G.; Zamora, S.; Lorenzo, C.; San Juan, R.; Muñoz-Ibáñez, B.; Vázquez, C.; Alonso-Moragón, A.; Gallego, J.; Trigo-Rodríguez, J. M.; Madiedo, J. M.

    2015-05-01

    Most of the activity of the group is based on the Fireball Detection Station located at the Observatorio UCM, a system consisting of 6 high-sensitivity videocameras covering the whole sky with wide-angle lenses during nighttime. Another 15 cameras have been placed by the researchers between 10 and 200 km away from Madrid for multiple station observations. It works as a node in the SPanish Meteor and Fireball Network (SPMN), a network of similar stations covering the atmosphere over Spain. Besides the continuous monitoring, the group has worked on the recording and analysis of some meteor showers. Most of the attention was focused on the Draconids 2011 campaign at Observatorio de Sierra Nevada (Trigo-Rodríguez, J. M., Madiedo, J. M., Williams, I. P., et al. 2013, MNRAS, 433, 560; Ocaña, F., Palos, M. F., Zamorano, J., et al. 2013, Proceedings of the International Meteor Conference, 31st IMC, La Palma, Canary Islands, Spain, 2012, 70), and the 2012 Geminids balloon-borne mission over Spain (Sánchez de Miguel, A., Ocaña, F., Madiedo, J. M., et al. 2013, Lunar and Planetary Science Conference, 44, 2202). The products of the station have been used for undergraduate thesis projects at the Physics Faculty (Ocaña, F., 2011, UCM e-prints, 13292) and other undergraduate projects. In 2013 the station received new equipment thanks to the Certamen Arquímedes award, complementing the detection with spectroscopic and frame-integrating devices.

  8. The age-mass relation for chromospherically active binaries. III. Lithium depletion in giant components

    NASA Astrophysics Data System (ADS)

    Barrado y Navascues, D.; de Castro, E.; Fernandez-Figueroa, M. J.; Cornide, M.; Garcia Lopez, R. J.

    1998-09-01

    We present a study of the lithium abundances of a sample of evolved components of Chromospherically Active Binary Systems. We show that a significant part of them have lithium excesses, independently of their mass and evolutionary stage. Therefore, it can be concluded that Li abundance does not depend on age for giant components of CABS. These overabundances appear to be closely related to the stellar rotation, and we interpret them as a consequence of the transfer of angular momentum from the orbit to the rotation as the stars evolve in and off the Main Sequence, in a similar way as it happens in the dwarf components of the same systems and in the Tidally Locked Binaries belonging to the Hyades and M67. Based on observations collected with the 2.2\\,m telescope of the German-Spanish Observatorio de Calar Alto (Almeria, Spain), and with the 2.56\\,m Nordic Optical Telescope in the Spanish Observatorio del Roque de los Muchachos of the Instituto de Astrof\\'\\i sica de Canarias (La Palma, Spain)

  9. Long-term photometry of WX Arietis: evidence for eclipses and dips

    NASA Astrophysics Data System (ADS)

    Rodríguez-Gil, P.; Casares, J.; Dhillon, V. S.; Martínez-Pais, I. G.

    2000-03-01

    We present R-band photometry of the SW Sex-type cataclysmic variable WX Arietis made in October 1995 and August 1998-February 1999. Contrary to previous results, we find that WX Ari is an eclipsing system with an orbital inclination of i =~ 72o. The R-band light curves display highly variable, shallow eclipses ~ 0.15-mag deep and =~ 40 min long. The observed eclipse depth suggests a partial eclipse of the accretion disc. The light curves also show a wide dip in brightness centred at orbital phase varphi ~ 0.75 and a hump close to the opposite phase at varphi ~ 0.2. The observed dip may be explained by the probable vertical thickening of the outer rim of the accretion disc downstream from the bright spot. We also demonstrate that the disc brightness in all SW Sex systems is nearly the same. This implies that the orbital inclination of these systems is only a function of eclipse depth. Based on observations made with the Optical Ground Station (OGS) and the IAC--80 telescopes, operated on the island of Tenerife by the European Space Agency (ESA) and the Ins\\-ti\\-tu\\-to de Astrof\\'\\i sica de Canarias (IAC), respectively, at the Spanish Observatorio del Teide and with the Jacobus Kapteyn Telescope (JKT), operated on the island of La Palma by PPARC at the Spanish Observatorio del Roque de los Muchachos.

  10. The onset of flood basalt volcanism, Northern Paraná Basin, Brazil: A precise U-Pb baddeleyite/zircon age for a Chapecó-type dacite

    NASA Astrophysics Data System (ADS)

    Janasi, Valdecir de Assis; de Freitas, Vivian Azor; Heaman, Larry H.

    2011-02-01

    We report the first U-Pb baddeleyite/zircon date for a felsic volcanic rock from the Paraná Large Igneous Province in south Brazil. The new date of 134.3 ± 0.8 Ma for a hypocrystalline Chapecó-type dacite from Ourinhos (northern Paraná basin) is an important regional time marker for the onset of flood basalt volcanism in the northern and western portion of the province. The dated dacite was erupted onto basement rocks and is overlain by a high-Ti basalt sequence, interpreted to be correlative with Pitanga basalts elsewhere. This new U-Pb date for the Ourinhos dacite is consistent with the local stratigraphy being slightly older than the few reliable step-heating 40Ar/39Ar dates currently available for overlying high-Ti basalts (133.6-131.5 Ma). This indicates an ~ 3 Ma time span for the building of the voluminous high-Ti lava sequence of the Paraná basin. On the other hand, it overlaps the 40Ar/39Ar dates (134.8-134.1 Ma) available for the stratigraphically older low-Ti basalt (Gramado + Esmeralda types) and dacite-rhyolite (Palmas type) sequences from South Brazil, which is consistent with the short-lived character of this volcanism and its rapid succession by the high-Ti sequence.

  11. Spectrally Resolved Intensities of Ultra-Dense Hot Aluminum Plasmas

    NASA Astrophysics Data System (ADS)

    Gil, J. M.; Rodríguez, R.; Florido, R.; Rubiano, J. G.; Martel, P.; Mínguez, E.; Sauvan, P.; Angelo, P.; Schott, R.; Dalimier, E.; Mancini, R.

    2008-10-01

    We present a first study of spectroscopic determination of electron temperature and density spatial profiles of aluminum K-shell line emission spectra from laser-shocked aluminum experiments performed at LULI. The radiation emitted by the aluminum plasma was dispersed with an ultra-high resolution spectrograph (λ/Δλ≈6000). From the recorded films one can extract a set of time-integrated emission lineouts associated with the corresponding spatial region of the plasma. The observed spectra include the Lyα, Heβ, Heγ, Lyβ and Lyγ line emissions and their associated He- and Li-like satellites thus covering a photon energy range from 1700 eV to 2400 eV approximately. The data analysis rely on the ABAKO/RAPCAL computational package, which has been recently developed at the University of Las Palmas de Gran Canaria and takes into account non-equilibrium collisional-radiative atomic kinetics, Stark broadened line shapes and radiation transport calculations.

  12. Anomalies in the sand fly Lutzomyia longipalpis (Diptera: Psychodidae) in Brazil.

    PubMed

    Sanguinette, Cristiani de Castilho; Faustino, Juliana Xavier; Serra e Meira, Paula Cavalcante Lamy; Botelho, Helbert Antônio; Carvalho, Gustavo Mayr de Lima; Gontijo, Célia Maria Ferreira; Filho, José Dilermando Andrade

    2013-03-01

    Lutzomyia longipalpis is the main species involved in the epidemiological cycle of visceral leishmaniasis in Brazil. This species shows a wide geographic distribution and belongs to a group that has 2 setae in the paramere with the curved tips towards the apex of this structure among other characteristics. Morphological characters in the genitalia of phlebotomines are essential for correct identification of species. The aim of this study was to report the finding of unilateral and bilateral anomalies in the paramere of L. longipalpis males collected in Várzea da Palma municipality, Minas Gerais State, Brazil. Twelve collections were made during the period April 2009 to March 2010, using Centers for Disease Control and Prevention light traps, HP model. Of the 8,832 male L. longipalpis collected, we found 6 types of unilateral anomalies and 2 types of bilateral anomalies in 0.5% of the insects collected. The anomalies were described according to number, position, and size of the setae of paramere. This information will be useful in the validation of new species.

  13. Large-field high-resolution mosaic movies

    NASA Astrophysics Data System (ADS)

    Hammerschlag, Robert H.; Sliepen, Guus; Bettonvil, Felix C. M.; Jägers, Aswin P. L.; Sütterlin, Peter; Lin, Yong; Martin, Sara F.; Panasenco, Olga; Romashets, Eugene P.

    2013-08-01

    Movies with fields-of-view larger than normal, for high-resolution telescopes, will give a better understanding of processes on the Sun such as filament and active region developments and their possible interactions. New active regions can serve as an igniter of the eruption of a nearby filament. A method to create a large field-of-view is to join several fields-of-view into a mosaic. Fields are imaged quickly, one after another, using fast telescope-pointing. Such a pointing cycle has been automated at the Dutch open telescope (DOT), a high-resolution solar telescope located on the Canary Island La Palma. The number and positions of the subfields are calculated automatically and represented by an array of bright points in the guider image which indicates the subfield centers inside the drawn rectangle of the total field on the computer screen with the whole-sun image. Automatic production of flats is also programmed. For the first time, mosaic movies were programmed from stored information on automated telescope motions. The mosaic movies show larger regions of the solar disk in high resolution and fill a gap between available whole-sun images with limited spatial resolution of synoptic telescopes including space instruments and small-field high-cadence movies of high-resolution solar telescopes.

  14. [Influence of promotional material on hand hygiene in the safety culture of a tertiary hospital].

    PubMed

    Molina-Cabrillana, J; Dorta-Hung, M E; Otero Sanz, L; Henández Vera, J R; Martín-Rodríguez, M M; García de Carlos, P

    2016-06-01

    In order to increase safety culture about hand hygiene by means of messages and reminders about its importance in preventing nosocomial infections, we developed a new set of materials in the Complejo Hospitalario Universitario Insular Materno-Infantil of Las Palmas, Gran Canaria, constitued by two centres with 450 beds each and acredited for medical internal residents training. We hired a well-known caricaturist, who adapted the messages to the local way of speaking, by using characters that used to appear in his artwork in the local newspaper. Also, we continued to work with other graphic design professionals. We monitored adherence and consumption of products for hand rubbing. We noted an increase in both indicators in the following months after the implementation of this strategy. Moreover, we revised the infrastructures for hand hygiene, and were able to demonstrate improvements in most of the patient care areas. The material was well accepted by professionals, patients and visitors. No other interventions were made, so we think improvements can be attributable to this strategy in our setting.

  15. Passive states as optimal inputs for single-jump lossy quantum channels

    NASA Astrophysics Data System (ADS)

    De Palma, Giacomo; Mari, Andrea; Lloyd, Seth; Giovannetti, Vittorio

    2016-06-01

    The passive states of a quantum system minimize the average energy among all the states with a given spectrum. We prove that passive states are the optimal inputs of single-jump lossy quantum channels. These channels arise from a weak interaction of the quantum system of interest with a large Markovian bath in its ground state, such that the interaction Hamiltonian couples only consecutive energy eigenstates of the system. We prove that the output generated by any input state ρ majorizes the output generated by the passive input state ρ0 with the same spectrum of ρ . Then, the output generated by ρ can be obtained applying a random unitary operation to the output generated by ρ0. This is an extension of De Palma et al. [IEEE Trans. Inf. Theory 62, 2895 (2016)], 10.1109/TIT.2016.2547426, where the same result is proved for one-mode bosonic Gaussian channels. We also prove that for finite temperature this optimality property can fail already in a two-level system, where the best input is a coherent superposition of the two energy eigenstates.

  16. Microgravity effects on Arabidopsis thaliana energy pool

    NASA Astrophysics Data System (ADS)

    Dobrota, C.; Piso, M. I.; Banciu, H.; Keul, A.

    The flexibility of plant bioenergetics helps plants to acclimate to environmental stresses Our work is focused on standard free energy changes for PPi and ATP hydrolysis in order to assess the relative importance of PPi versus ATP as an energy donor in the plant cytosol of Arabidopsis plants exposed to microgravity The results indicated that PPi would be particularly favored as a phosphoryl donor relative to ATP under cytosolic conditions known to accompany stresses Recent researches showed that besides its functions inside the cell ATP may be released to the extracellular milieu where it functions as the primary signaling molecule of a diverse range of physiological processes It seems that extracellular ATP is essential for maintaining plant cell viability We intend to study how the production and the release of ATP is influenced by the microgravity References begin enumerate item Chivasaa S Bongani K Ndimbab W Simonc J Lindseyc K and Slabasc A 2005 Extracellular ATP Functions as an Endogenous External Metabolite Regulating Plant Cell Viability The Plant Cell 17 3019-3034 item Palma D A Blumwald E and Plaxton W C 2000 Upregulation of vacuolar H -translocating pyrophosphatase by phosphate starvation of Brassica napus rapeseed suspension cell cultures FEBS Letters 486 155-158 item Plaxton W C 2004 Plant response to stress Biochemical adaptations to phosphate deficiency In R Goodman ed Encyclopedia of Plant and Crop Science Marcel Dekker Inc N Y end enumerate

  17. Observations on cucullanid nematodes from freshwater fishes in Mexico, including Dichelyne mexicanus sp. n.

    PubMed

    Caspeta-Mandujano, J M; Moravec, F; Salgado-Maldonado, G

    1999-01-01

    A new cucullanid nematode, Dichelyne mexicanus sp. n., is described from the intestine of three species of fishes, Agonostomus monticola (Bancroft) (Mugilidae, Perciformes) (type host), Ictalurus balsanus (Jordan et Snyder) (Ictaluridae, Siluriformes) and Cichlasoma beani (Jordan) (Cichlidae, Perciformes), from three rivers (La Maquina River, Veracruz; Chontalcoatlán River, Guerrero and Santiago River, Nayarit) in central Mexico. This species is characterised by the absence of a ventral sucker in the male (subgenus Dichelyne) and it differs from its congeners mainly in possessing very unequal and dissimilar spicules (left 0.465-0.768 mm and right 293-548 mm long), an asymmetrical gubernaculum, and two intestinal caeca. Another cucullanid nematode, Cucullanus caballeroi Petter, 1977, is reported from Dormitator maculatus (Bloch) (Eleotridae, Perciformes) from the La Palma and La Maquina Rivers and Balzapote stream, Veracruz, being briefly described and illustrated; this represents a new host record. Findings of D. mexicanus and C. caballeroi represent a new record of cucullanid nematodes from fishes in Mexican fresh waters.

  18. [Trends in frequency of consumption of beans assessed by means of a telephone survey in Brazilian state capitals between 2006 and 2009].

    PubMed

    Velásquez-Meléndez, Gustavo; Mendes, Larissa Loures; Pessoa, Milene Cristine; Sardinha, Luciana Monteiro Vasconcelos; Yokota, Renata Tiene de Carvalho; Bernal, Regina Tomie Ivata; Malta, Deborah Carvalho

    2012-12-01

    The scope of this paper was to analyze the trends of frequency of consumption of beans between the years 2006 and 2009 in the Brazilian capitals. This is a historical series using the Vigitel database for all Brazilian state capitals. Consumption of beans was described in terms of relative frequency and the trend was assessed using Poisson regression. Between 65.79% (2009) and 71.85% (2006) of participants reported consuming beans five or more days per week. The capitals Goiania, Belo Horizonte, Palmas, Brasilia and Cuiaba were in the highest frequency range of consumption throughout the study period. Individuals with a BMI in the appropriate and low weight category had the highest frequencies of consumption in comparison with the overweight and the obese. A significant reduction trend in the consumption of beans per year of the research, except for the 45 to 54-year-old range, was detected. The conclusion drawn was that there has been a significant reduction in the consumption of beans in the Brazilian population and the adoption of monitoring and incentive policies is necessary due to the benefits of the legume.

  19. Vulnerability and Productivity Impacts of Farm-Level Interventions in the Brazilian Sertão

    NASA Astrophysics Data System (ADS)

    Burney, J. A.

    2014-12-01

    The Brazilian Sertão exemplifies the complex dynamics between climate, land use, agricultural production, and food security presently playing out across the world's semi-arid tropics. Regional climate change in the past half-century is some of the most dramatic in the world -- +2 degrees average warming in many districts and -300mm rainfall. Crop yields have improved weakly or remained stagnant, in stark contrast with the rest of Brazil. As a result many smallholder farmers have increasingly turned to milk production, but they remain dependent on rainfall for forage growth. During droughts they thus face a choice between overgrazing and letting their cattle die. As a result, deforestation of the native Caatinga biome has been rampant, with estimates of 85% loss. We present the results of controlled tests, conducted with over one hundred farmers, of several on-farm interventions meant to boost on-farm productivity, reduce vulnerability to rainfall shocks, and lessen the incentives for deforestation. These interventions -- water cisterns, smallholder irrigation systems, balancing of animal feed ratios, and cultivation and use of palma forrageira as cattle feed -- are described and presented with results of their impact on productivity and vulnerability/resilience metrics. Estimates of larger-scale social benefits and future land-use change impacts are also discussed.

  20. Open-loop tomography with artificial neural networks on CANARY: on-sky results

    NASA Astrophysics Data System (ADS)

    Osborn, J.; Guzman, D.; de Cos Juez, F. J.; Basden, A. G.; Morris, T. J.; Gendron, E.; Butterley, T.; Myers, R. M.; Guesalaga, A.; Sanchez Lasheras, F.; Gomez Victoria, M.; Sánchez Rodríguez, M. L.; Gratadour, D.; Rousset, G.

    2014-07-01

    We present recent results from the initial testing of an artificial neural network (ANN)-based tomographic reconstructor Complex Atmospheric Reconstructor based on Machine lEarNing (CARMEN) on CANARY, an adaptive optics demonstrator operated on the 4.2 m William Herschel Telescope, La Palma. The reconstructor was compared with contemporaneous data using the Learn and Apply (L&A) tomographic reconstructor. We find that the fully optimized L&A tomographic reconstructor outperforms CARMEN by approximately 5 per cent in Strehl ratio or 15 nm rms in wavefront error. We also present results for CANARY in Ground Layer Adaptive Optics mode to show that the reconstructors are tomographic. The results are comparable and this small deficit is attributed to limitations in the training data used to build the ANN. Laboratory bench tests show that the ANN can outperform L&A under certain conditions, e.g. if the higher layer of a model two layer atmosphere was to change in altitude by ˜300 m (equivalent to a shift of approximately one tenth of a subaperture).

  1. Studies in neotropical paleobotany. XIV. A palynoflora from the middle Eocene Saramaguacan formation of Cuba

    USGS Publications Warehouse

    Graham, A.; Cozadd, D.; Areces-Mallea, A.; Frederiksen, N.O.

    2000-01-01

    An assemblage of 46 fossil pollen and spore types is described from a core drilled through the middle Eocene Saramaguacan Formation, Camaguey Province, eastern Cuba. Many of the specimens represent unidentified or extinct taxa but several can be identified to family (Palmae, Bombacaceae, Gramineae, Moraceae, Myrtaceae) and some to genus (Pteris, Crudia, Lymingtonia?). The paleo-climate was warm-temperate to subtropical which is consistent with other floras in the region of comparable age and with the global paleotemperature curve. Older plate tectonic models show a variety of locations for proto-Cuba during Late Cretaceous and later times, including along the norther coast of South America. More recent models depict western and central Cuba as two separate parts until the Eocene, and eastern Cuba (joined to northern Hispaniola) docking to central Cuba also in the Eocene. All fragments are part of the North American Plate and none were directly connected with northern South America in late Mesozoic or Cenozoic time. The Saramaguacan flora supports this model because the assemblage is distinctly North American in affinities, with only one type (Retimonocolpites type 1) found elsewhere only in South America.

  2. MEGARA optical manufacturing process

    NASA Astrophysics Data System (ADS)

    Carrasco, E.; Páez, G.; Granados, F.; Percino, E.; Castillo-Domínguez, E.; Avilés, J. L.; García-Vargas, M. L.; Gil de Paz, A.; Gallego, J.; Iglesias-Páramo, J.; Cedazo, R.

    2014-07-01

    MEGARA is the future visible integral-field and multi-object spectrograph for the GTC 10.4-m telescope located in La Palma. INAOE is a member of the MEGARA Consortium and it is in charge of the Optics Manufacturing work package. MEGARA passed the Optics Detailed Design Review in May 2013, and the blanks of the main optics have been already ordered and their manufacturing is in progress. Except for the optical fibers and microlenses, the complete MEGARA optical system will be manufactured in Mexico, shared between the workshops of INAOE and CIO. This includes a field lens, a 5-lenses collimator, a 7-lenses camera and a complete set of volume phase holographic gratings with 36 flat windows and 24 prisms, being all these elements very large and complex. Additionally, the optical tests and the complete assembly of the camera and collimator subsystems will be carried out in Mexico. Here we describe the current status of the optics manufacturing process.

  3. The evolutionary status of the bright high-latitude supergiant HD 190390

    NASA Astrophysics Data System (ADS)

    Reyniers, M.; Cuypers, J.

    2005-03-01

    Despite its mean apparent magnitude of mV = 6.39, the evolutionary status of HD 190390 (HR 7671), a luminous F-type supergiant at high galactic latitude, is still not very clear, but in most papers a post-AGB classification is assumed. New observational material has been obtained with four different instruments and is presented here. An extensive abundance analysis based on high resolution, high signal-to-noise NTT+EMMI spectra confirms the metal deficiency of this object ([Fe/H] = -1.6), together with a high lithium content (log ɛ(Li) = 1.9). A variability analysis based on Geneva photometry over seven years reveals beating with a period of ~3000 days. It is, however, not clear whether this beating is caused by a stable triplet, or it is the consequence of small changes in the main frequency. More recent data obtained with the HIPPARCOS satellite and the Mercator telescope not only confirm the main period, but also support the presence of a second periodicity of 11 days, which was also found in the Geneva photometry. A conclusive evolutionary status of this object is not given, but alternative to the UU Her (i.e. post-AGB) status, a W Vir classification is discussed. Based on observations collected at the European Southern Observatory, La Silla, Chile (programme 61.E-0426), and at the Observatorio del Roque de los Muchachos, La Palma, Spain.

  4. Discovery of Very High Energy Gamma-Ray Emission from 1FGL J2001.1 4351 by MAGIC

    SciTech Connect

    Berger, Karsten; Paneque, David; Giavitto, Gianluca; /Barcelona, IFAE

    2012-05-07

    We report the discovery of Very High Energy (VHE; >100 GeV) gamma-ray emission from the source 1FGL J2001.1+4351, (RA 20 01 13.5, dec 43 53 02.8, J2000), which is positionally consistent with the location of the flat spectrum radio source MG4 J200112+4352 (RA 20 01 12.9, dec 43 52 52.8, J2000). The VHE detection is based on a 1.5 hour-long observation performed on July 16th in stereoscopic mode with the two 17m diameter imaging Cherenkov telescopes on La Palma, Canary Islands, Spain. The preliminary analysis of the MAGIC data using the standard cuts optimized for soft energy spectra sources yields a detection of 125 gamma-rays above 90 GeV, corresponding to a pre-trail statistical significance of 7.6 standard deviations. The observed flux is estimated to be {approx}20% of the Crab nebula flux above 100 GeV. Earlier MAGIC observations indicated a substantially lower flux; hence indicating that the source is variable on a few days timescale.

  5. Determination of alkylphenol polyethoxylates, bisphenol-A, 17α-ethynylestradiol and 17β-estradiol and its metabolites in sewage samples by SPE and LC/MS/MS.

    PubMed

    Vega-Morales, T; Sosa-Ferrera, Z; Santana-Rodríguez, J J

    2010-11-15

    Recently, many chemicals released into the environment have been shown to mimic endogenous hormones such as estradiol. It has been demonstrated that these compounds cause several adverse effects on wildlife and humans, such as the feminization of animal species, development of physical abnormalities and birth defects, and reproductive failure. In an effort to model the behaviour of some endocrine-disrupting chemicals (EDCs) and to establish the level of contamination in sewage samples, a quantitative method for the simultaneous determination of nonylphenol, octylphenol and corresponding ethoxylates (1-12), 17α-ethynylestradiol, bisphenol-A, and 17β-estradiol and two of its metabolites have been developed. Identification and quantification were achieved by high performance liquid chromatography-tandem mass spectrometry (LC-ESI-MS/MS). Satisfactory detection limits (between 0.5-6 ng L(-1) in the dissolved phase and 1.4-12.7 ng g(-1) in the particulate phase) and analyte recoveries (between 60% and 108%) were achieved for target compounds. The optimised method was applied to the determination of EDCs in liquid sewage samples collected from a wastewater treatment plant (WWTP) in Las Palmas de Gran Canaria (Spain). Concentrations of EDCs ranged from <10 ng L(-1) to nearly 1200 ng L(-1) in the dissolved phase, and from 0.005 μg g(-1) to 2.8 μg g(-1) in the suspended particulate matter. PMID:20724070

  6. A comparative study of the ionospheric F-region observations in the Brazilian low latitude region and the TIMEGCM model results during the super geomagnetic storm of 20 November 2003

    NASA Astrophysics Data System (ADS)

    Becker-Guedes, F.; Sahai, Y.; Fagundes, P.; Crowley, G.; Lima, W.

    The TIMEGCM is a global 1st principles model of the ionosphere-thermosphere I-T system with fully coupled and interactive ionospheric and thermospheric components The model requires a specification of the high latitude electric potential distribution for each time step along with specification of the auroral particle precipitation Each of these parameters is obtained by use of the AMIE Assimilative Mapping of Ionospheric Electrodynamics technique which assimilates data from nearly 200 ground-based magnetometers several DMSP satellites and the SuperDARN radar network In this paper we compare ionospheric observations from two low-latitude ionospheric sounding stations with predictions from the TIMEGCM during the super geomagnetic storm of 20 November 2003 The super geomagnetic storm with SSC at 08 03 UT on 20 November attained vert Dst vert max 472 nT at 20 00 UT 20 11 The digital ionosondes using the Canadian Advanced Digital Ionosondes CADIs are located at Palmas PAL 10 2 r S 48 2 r W dip latitude 5 5 r S a near equatorial station and S a o Jos e dos Campos SJC 23 2 r S 45 9 r W dip latitude 17 6 r S station located under the crest of equatorial ionospheric anomaly Brazil Comparisons of model predictions with ionospheric observations during intense geomagnetic disturbances are important studies related to space weather forecasting Salient features from this comparative study are presented and discussed in this paper

  7. Isolation and prominent aboriginal maternal legacy in the present-day population of La Gomera (Canary Islands)

    PubMed Central

    Fregel, Rosa; Cabrera, Vicente M; Larruga, José M; Hernández, Juan C; Gámez, Alejandro; Pestano, Jose J; Arnay, Matilde; González, Ana M

    2015-01-01

    The present-day population structure of La Gomera is outstanding in its high aboriginal heritage, the greatest in the Canary Islands. This was earlier confirmed by both mitochondrial DNA and autosomal analyses, although genetic drift due to the fifteenth century European colonization could not be excluded as the main factor responsible. The present mtDNA study of aboriginal remains and extant samples from the six municipal districts of the island indeed demonstrates that the pre-Hispanic colonization of La Gomera by North African people involved a strong founder event, shown by the high frequency of the indigenous Canarian U6b1a lineage in the aboriginal samples (65%). This value is even greater than that observed in the extant population (44%), which in turn is the highest of all the seven Canary Islands. In contrast to previous results obtained for the aboriginal populations of Tenerife and La Palma, haplogroups related to secondary waves of migration were not detected in La Gomera aborigines, indicating that isolation also had an important role in shaping the current population. The rugged relief of La Gomera divided into several distinct valleys probably promoted subsequent aboriginal intra-insular differentiation that has continued after the European colonization, as seen in the present-day population structure observed on the island. PMID:25407001

  8. Revised guidelines for the clinical management of Lynch syndrome (HNPCC): recommendations by a group of European experts

    PubMed Central

    Vasen, Hans F A; Blanco, Ignacio; Aktan-Collan, Katja; Gopie, Jessica P; Alonso, Angel; Aretz, Stefan; Bernstein, Inge; Bertario, Lucio; Burn, John; Capella, Gabriel; Colas, Chrystelle; Engel, Christoph; Frayling, Ian M; Genuardi, Maurizio; Heinimann, Karl; Hes, Frederik J; Hodgson, Shirley V; Karagiannis, John A; Lalloo, Fiona; Lindblom, Annika; Mecklin, Jukka-Pekka; Møller, Pal; Myrhoj, Torben; Nagengast, Fokko M; Parc, Yann; Ponz de Leon, Maurizio; Renkonen-Sinisalo, Laura; Sampson, Julian R; Stormorken, Astrid; Sijmons, Rolf H; Tejpar, Sabine; Thomas, Huw J W; Rahner, Nils; Wijnen, Juul T; Järvinen, Heikki Juhani; Möslein, Gabriela

    2013-01-01

    Lynch syndrome (LS) is characterised by the development of colorectal cancer, endometrial cancer and various other cancers, and is caused by a mutation in one of the mismatch repair genes: MLH1, MSH2, MSH6 or PMS2. In 2007, a group of European experts (the Mallorca group) published guidelines for the clinical management of LS. Since then substantial new information has become available necessitating an update of the guidelines. In 2011 and 2012 workshops were organised in Palma de Mallorca. A total of 35 specialists from 13 countries participated in the meetings. The first step was to formulate important clinical questions. Then a systematic literature search was performed using the Pubmed database and manual searches of relevant articles. During the workshops the outcome of the literature search was discussed in detail. The guidelines described in this paper may be helpful for the appropriate management of families with LS. Prospective controlled studies should be undertaken to improve further the care of these families. PMID:23408351

  9. Near-infrared camera for solar research: a photometric application

    NASA Astrophysics Data System (ADS)

    Reyes, Marcos; Joven-Alvarez, Enrique; Collados, Manuel; Bonet, Jose A.; Vazquez, Manuel; Diaz, Jose J.; Fuentes, F. Javier; Escalera, Victor G.; Rodriguez, Luis F.; Garcia-Herrero, Jose L.

    1998-09-01

    We report here the main characteristics of a near IR camera devoted to astrophysical solar research, which has been developed by the Instituto de Astrofisica de Canarias (IAC). The system is now being used for photometric and spectroscopic applications, and it will also be used for spectropolarimetry in the near future. The first application is described below in detail. The IACs IR camera is based on a Rockwell 256 X 256 HgCdTe NICMOS3 array, sensitive from 1 to 2.5 microns. The necessary cooling system is a LN2- cryostat, designed and built by IR labs under out requirements. The main electronics are the standard VME- based, FPGA programmable MCE-3 system, also developed by IR labs. We have implemented different readout schemes to improve sped, reduce noise and avoid seeing effects, taking into account each specific application. Data are transferred via fiber optics to a control unit, which re-send them to the main data acquisition system. Several acquisition modes to select the best images have been implemented, and a real- time data processing is available, the entire camera has been characterized and calibrated, and the main radiometric parameters given. Preliminary test in spectroscopic observations have been made in the German Towers at the Observatorio del Teide in Tenerife, Spain, and a series of photometric measurements performed in the Swedish Solar Telescope, at the Observatorio del Roque de los Muchachos in La Palma, Spain. As examples, some scientific results are also presented.

  10. Diversification of the forest beetle genus Tarphius on the Canary Islands, and the evolutionary origins of island endemics.

    PubMed

    Emerson, Brent C; Oromí, Pedro

    2005-03-01

    The flightless beetle genus Tarphius Erichson (Coleoptera: Colydiidae) is a distinctive element of the beetle fauna of the Canary Islands with 29 species distributed across the five western islands. The majority of Tarphius species are rare and intimately associated with the monteverde forest and only two species occur on more than one island. In this study we investigate the phylogeography of the Canary Island Tarphius, and their relationship to Tarphius from the more northerly archipelagos of Madeira and the Azores using maximum parsimony and Bayesian inference analysis of mitochondrial cytochrome oxidase I and II sequence data. We use geological datings for the Canary Islands, Azores, and Madeira to calibrate specific nodes of the tree for the estimation of divergence times using a penalized likelihood method. Data suggest that the Canary Island species assemblage is of some antiquity, however, much of this species diversity is relatively recent in origin. The phylogenetic relationships of species inhabiting the younger islands of El Hierro and La Palma indicate that colonization events between islands have probably been a significant factor in the evolutionary history of the Canary Island species assemblage. A comparison of molecular phylogenetic studies of arthropods on the Canary Islands suggests that, in the evolution of the arthropod species community of an island, the origin of endemic species is initially the result of colonizing lineages differentiating from their source populations. However, as an island matures a greater proportion of endemic species originate from intra-island speciation.

  11. Lecture Notes and Essays in Astrophysics I. I Astrophysics Symposium of the GEA-RSEF.

    NASA Astrophysics Data System (ADS)

    Ulla, Ana; Manteiga, Minia

    2004-12-01

    This volume entittled "Lecture Notes and Essays in Astrophysics" is the first of a series containing the invited reviews and lectures presented during the biannual meetings of the Astrophysics Group of the spanish RSEF ("Real Sociedad Española de Física"). In particular, it includes the conferences and reviews presented during the meeting held at Madrid (Spain) on July 2003 during the First Centennial of the Spanish RSEF. The book is aimed to offer the specialized public, and particularly the astrophysics postgraduate students, selected comprehensive reviews on hot topics lectured by relevant speakers on the subject ("Lecture Notes"). The issue is complemented by a set of chapters on more specific topics ("Essays"). The turn of century has been rich with new discoveries, from the detections of extrasolar planets to the discovery of the the farthest galaxies ever seen or the detection of acceleration in the expansion of the Universe. Spain is leaving her imprint in the telescope making revolution and is promoting the construction of a 10.4 metre telescope in the ``Roque de Los Muchachos" observatory, in the Island of La Palma, Spain. This book provides an interesting insight on selected topics of modern Astrophysics as developped by Spanish astronomers.

  12. Progenitor mass constraints for core-collapse supernovae from correlations with host galaxy star formation

    NASA Astrophysics Data System (ADS)

    Anderson, J. P.; Habergham, S. M.; James, P. A.; Hamuy, M.

    2012-08-01

    less numerous SNe of Types IIL and IIb, and SN 'impostors'. Finally, we present an analysis of possible biases in the data, the results of which argue strongly against any selection effects that could explain the relative excess of Type Ibc SNe within bright H II regions. Thus, intrinsic progenitor differences in the sense of the mass sequence we propose remain the most plausible explanation of our findings. Based on observations made with the Isaac Newton Telescope operated on the island of La Palma by the Isaac Newton Group in the Spanish Observatorio del Roque de los Muchachos of the Instituto de Astrofisica de Canarias, observations made with the Liverpool Telescope operated on the island of La Palma by Liverpool John Moores University in the Spanish Observatorio del Roque de los Muchachos of the Instituto de Astrofisica de Canarias with financial support from the UK Science and Technology Facilities Council, and observations made with the 2.2-m MPG/ESO telescope at La Silla, proposal ID: 084.D-0195.

  13. "Canary Islands, a volcanic window in the Atlantic Ocean": a 7 year effort of public awareness on volcano hazards and risk management

    NASA Astrophysics Data System (ADS)

    Rodríguez, Fátima; Calvo, David; Pérez, Nemesio M.; Padrón, Eleazar; Melián, Gladys; Padilla, Germán; Barrancos, José; Hernández, Pedro A.; Asensio-Ramos, María; Alonso, Mar

    2016-04-01

    "Canary Islands: A volcanic window in the Atlantic Ocean" is an educational program born from the need to inform and educate citizens residing in the Canary Islands on the various hazards associated to volcanic phenomena. The Canary Islands is the only territory of Spain that hosts active volcanism, as is shown by the 16 historical eruptions that have occurred throughout this territory, being the last one a submarine eruption taking place on October 12, 2011, offshore El Hierro Island. In the last 7 years, ITER as well as INVOLCAN have been performing an educative program focused on educating to the population about the benefits of a volcanic territory, volcanic hazards, how to reduce volcanic risk and the management of volcanic risk in the Canary Islands. "Canary Islands: A volcanic window in the Atlantic Ocean" consists of three units, the first two dedicated to the IAVCEI/UNESCO videos "Understanding Volcanic Hazards" and "Reducing Volcanic Risk" and the third one dedicated to the management of volcanic risk in the Canary Islands, as well as some other aspects of the volcanic phenomena. Generally the three units are shown consecutively on Tuesday, Wednesday and Thursday. This educative program has been roaming all around the 88 municipalities of the archipelago since this initiative started in 2008. The total number of attendees since then amounts to 18,911 people. The increase of assistance was constant until 2011, with annual percentages of 7.8, 17.1 and 20.9 respectively, regarding to ratio assistant/municipality. Despite the heterogeneity of the audience, the main audience is related to aged people of 45 years and older. This could be related to the memories of the recent eruptions occurred at La Palma Island in 1949 and 1971. It is important to point out that many of those people attending the educative program are representatives of local government (i.e. civil protection). Regarding the interest of the audience, the educational program attendees have

  14. Photometric observations of comet 81P/Wild 2 during the 2010 perihelion passage

    NASA Astrophysics Data System (ADS)

    Bertini, I.; Barbieri, C.; Ho, T.-M.; Lazzarin, M.; Cremonese, G.; Küppers, M.; Magrin, S.; Marchi, S.

    2012-05-01

    Context. The Jupiter-family comet 81P/Wild 2, target of the NASA Stardust mission, is very important in the context of the studies of pristine objects in the solar system. First, it was only recently deflected into the present orbit, having spent at least 300 yr at higher heliocentric distance prior to the orbital change in 1974. It is therefore likely that the comet experienced a recent activation with consequent low alteration of its original material. Second, it is the only comet whose coma material was brought back to Earth for laboratory analysis. We observed the object between 2010 February 9 and September 9 for a total of 11 nights during the 2010 perihelion passage. Aims: The goals of the campaign were the characterization of the comet's dust activity and the comparison with previous apparitions to derive hints on the secular behavior of the object. Methods: Broadband R- and I-images were acquired using three instruments: ALFOSC, CAMELOT, and TCP. The first one is mounted at the Nordic Optical Telescope on La Palma, while the second and the third are mounted at the Instituto de Astrofisica de Canarias 0.82-m telescope on Tenerife. We analyzed the presence and variability of dust structures in the coma with image-enhancing techniques, the radial profile of the dust brightness, and we measured the dust production rate and the dust reddening. Results: We found evidence of a long-lasting sunward fan and anti-solar tail activity throughout all our observations up to a heliocentric distance of 2.42 AU. Afρ measurements suggest a pre-perihelion peak of the activity, caused by a seasonal effect, plus two post-perihelion outbursts. Both spatial and Afρ radial profiles indicate a steady-state coma at nucleocentric distances greater than ~1000-2000 km. The color analysis reveals a moderately reddened dust with a 6-9%/1000 Å reddening, consistent with the current picture of cometary dust. The second outburst emitted dust with lower reddening. Conclusions: The

  15. Observational and Dynamical Characterization of Main-belt Comet P/2010 R2 (La Sagra)

    NASA Astrophysics Data System (ADS)

    Hsieh, Henry H.; Yang, Bin; Haghighipour, Nader; Novaković, Bojan; Jedicke, Robert; Wainscoat, Richard J.; Denneau, Larry; Abe, Shinsuke; Chen, Wen-Ping; Fitzsimmons, Alan; Granvik, Mikael; Grav, Tommy; Ip, Wing; Kaluna, Heather M.; Kinoshita, Daisuke; Kleyna, Jan; Knight, Matthew M.; Lacerda, Pedro; Lisse, Carey M.; Maclennan, Eric; Meech, Karen J.; Micheli, Marco; Milani, Andrea; Pittichová, Jana; Schunova, Eva; Tholen, David J.; Wasserman, Lawrence H.; Burgett, William S.; Chambers, K. C.; Heasley, Jim N.; Kaiser, Nick; Magnier, Eugene A.; Morgan, Jeffrey S.; Price, Paul A.; Jørgensen, Uffe G.; Dominik, Martin; Hinse, Tobias; Sahu, Kailash; Snodgrass, Colin

    2012-05-01

    We present observations of the recently discovered comet-like main-belt object P/2010 R2 (La Sagra) obtained by Pan-STARRS1 and the Faulkes Telescope-North on Haleakala in Hawaii, the University of Hawaii 2.2 m, Gemini-North, and Keck I telescopes on Mauna Kea, the Danish 1.54 m telescope (operated by the MiNDSTEp consortium) at La Silla, and the Isaac Newton Telescope on La Palma. An antisolar dust tail is observed to be present from 2010 August through 2011 February, while a dust trail aligned with the object's orbit plane is also observed from 2010 December through 2011 August. Assuming typical phase darkening behavior, P/La Sagra is seen to increase in brightness by >1 mag between 2010 August and December, suggesting that dust production is ongoing over this period. These results strongly suggest that the observed activity is cometary in nature (i.e., driven by the sublimation of volatile material), and that P/La Sagra is therefore the most recent main-belt comet to be discovered. We find an approximate absolute magnitude for the nucleus of HR = 17.9 ± 0.2 mag, corresponding to a nucleus radius of ~0.7 km, assuming an albedo of p = 0.05. Comparing the observed scattering surface areas of the dust coma to that of the nucleus when P/La Sagra was active, we find dust-to-nucleus area ratios of Ad /AN = 30-60, comparable to those computed for fellow main-belt comets 238P/Read and P/2008 R1 (Garradd), and one to two orders of magnitude larger than for two other main-belt comets (133P/Elst-Pizarro and 176P/LINEAR). Using optical spectroscopy to search for CN emission, we do not detect any conclusive evidence of sublimation products (i.e., gas emission), finding an upper limit CN production rate of Q CN < 6 × 1023 mol s-1, from which we infer an H2O production rate of Q_H_2O\\,{<}\\,10^{26} mol s-1. Numerical simulations indicate that P/La Sagra is dynamically stable for >100 Myr, suggesting that it is likely native to its current location and that its composition is

  16. A deep scar in the flank of Tenerife (Canary Islands): Geophysical contribution to tsunami hazard assessment

    NASA Astrophysics Data System (ADS)

    Coppo, Nicolas P.; Schnegg, Pierre-André; Falco, Pierik; Costa, Roberto

    2009-05-01

    -782], potential movable volume is an unavoidable parameter to quantify and constrain tsunamigenic hazard. Numerical modelling of a tsunami generated by the potential La Palma landslide concluded that high amplitude waves threaten North Atlantic shorelines [Ward, S.N., Day, S.J., 2001. Cumbre Vieja volcano — Potential collapse and tsunami at La Palma, Canary Islands. Geophys. Res. Lett. 28, 397-400]. New audiomagnetotelluric results provide for the first time a good estimation of the Icod Valley (Tenerife, Canary Islands) volume, a potential giant landslide threatening the same shorelines. Two profiles image its electrically conductive roots with a characteristic of a U-shaped cross-section thought to be the consequence of previous landslides. By this study, we show that North Atlantic Ocean shorelines might be exposed to a destructive tsunami generated by a subaerial lateral collapse of at least 120 km 3 during the next strong felsic eruptive activity of the Teide-Pico Viejo complex. This article highlights the degree of urgency of carrying out geophysical investigations on the flanks of most volcanic islands prone to potential flank collapse. These investigations will contribute to the understanding of their structure — a key parameter in the sliding process. Finally, all results should be included in model, providing a global map of tsunami hazard assessment.

  17. Evidence of a massive planet candidate orbiting the young active K5V star BD+20 1790

    NASA Astrophysics Data System (ADS)

    Hernán-Obispo, M.; Gálvez-Ortiz, M. C.; Anglada-Escudé, G.; Kane, S. R.; Barnes, J. R.; de Castro, E.; Cornide, M.

    2010-03-01

    (TNG) operated on the island of La Palma by the Fundación Galileo Galilei of the INAF (Istituto Nazionale di Astrofisica) at the Spanish Observatorio del Roque de los Muchachos of the Instituto de Astrofísica de Canarias. Based on observations made with the Liverpool Telescope operated on the island of La Palma by Liverpool John Moores University in the Spanish Observatorio del Roque de los Muchachos of the Instituto de Astrofísica de Canarias with financial support from the UK Science and Technology Facilities Council.Our radial velocity data from Table 3 are available in electronic form at the CDS via anonymous ftp to cdsarc.u-strasbg.fr (130.79.128.5) or via http://cdsweb.u-strasbg.fr/cgi-bin/qcat?J/A+A/512/A45

  18. Is the semi-regular variable RU Vulpeculae undergoing a helium-shell flash?

    NASA Astrophysics Data System (ADS)

    Uttenthaler, S.; Greimel, R.; Templeton, M.

    2016-03-01

    The semi-regular variable star RU Vulpeculae (RU Vul) is being observed visually since 1935. Its pulsation period and amplitude are declining since ˜ 1954. A leading hypothesis to explain the period decrease in asymptotic giant branch (AGB) stars such as RU Vul is an ongoing flash of the He-burning shell, also called a thermal pulse (TP), inside the star. In this paper, we present a CCD photometric light curve of RU Vul, derive its fundamental parameters, and test if the TP hypothesis can describe the observed period decline. We use CCD photometry to determine the present-day pulsation period and amplitude in three photometric bands, and high-resolution optical spectroscopy to derive the fundamental parameters. The period evolution of RU Vul is compared to predictions by evolutionary models of the AGB phase. We find that RU Vul is a metal-poor star with a metallicity [M/H]=-1.59±0.05 and an effective surface temperature of T_eff=3634±20 K. The low metallicity of RU Vul and its kinematics indicate that it is an old, low-mass member of the thick disc or the halo population. The present day pulsation period determined from our photometry is ˜ 108 d, the semi-amplitude in the V-band is 0.39±0.03 mag. The observed period decline is found to be well matched by an evolutionary AGB model with stellar parameters comparable to those of RU Vul. We conclude that the TP hypothesis is in good agreement with the observed period evolution of RU Vul. Based on observations made with the Mercator Telescope, operated on the island of La Palma by the Flemish Community, at the Spanish Observatorio del Roque de los Muchachos of the Instituto de Astrofísica de Canarias.

  19. Insertional Inactivation of eap in Staphylococcus aureus Strain Newman Confers Reduced Staphylococcal Binding to Fibroblasts

    PubMed Central

    Hussain, Muzaffar; Haggar, Axana; Heilmann, Christine; Peters, Georg; Flock, Jan-Ingmar; Herrmann, Mathias

    2002-01-01

    To initiate invasive infection, Staphylococcus aureus must adhere to host substrates, such as the extracellular matrix or eukaryotic cells, by virtue of different surface proteins (adhesins). Recently, we identified a 60-kDa cell-secreted extracellular adherence protein (Eap) of S. aureus strain Newman with broad-spectrum binding characteristics (M. Palma, A. Haggar, and J. I. Flock, J. Bacteriol. 181:2840-2845, 1999), and we have molecularly confirmed Eap to be an analogue of the previously identified major histocompatibility complex class II analog protein (Map) (M. Hussain, K. Becker, C. von Eiff, G. Peter, and M. Herrmann, Clin. Diagn. Lab. Immunol. 8:1281-1286, 2001). Previous analyses of the Eap/Map function performed with purified protein did not allow dissection of its precise role in the complex situation of the staphylococcal whole cell presenting several secreted and wall-bound adhesins. Therefore, the role of Eap was investigated by constructing a stable eap::ermB deletion in strain Newman and by complementation of the mutant. Patterns of extracted cell surface proteins analyzed both by sodium dodecyl sulfate-polyacrylamide gel electrophoresis and by Western ligand assays with various adhesive matrix molecules clearly confirmed the absence of Eap in the mutant. However, binding and adhesion tests using whole staphylococcal cells demonstrated that both the parent and mutant strains bound equally well to fibronectin- and fibrinogen-coated surfaces, possibly due to their recognition by other staphylococcal adhesins. Furthermore, Eap mediated staphylococcal agglutination of both wild-type and mutant cells. In contrast, the mutant adhered to a significantly lesser extent to cultured fibroblasts (P < 0.001) than did the wild type, while adherence was restorable upon complementation. Furthermore, adherence to both epithelial cells (P < 0.05) and fibroblasts (not significant) could be blocked with antibodies against Eap, whereas preimmune serum was not active

  20. Insertional inactivation of Eap in Staphylococcus aureus strain Newman confers reduced staphylococcal binding to fibroblasts.

    PubMed

    Hussain, Muzaffar; Haggar, Axana; Heilmann, Christine; Peters, Georg; Flock, Jan-Ingmar; Herrmann, Mathias

    2002-06-01

    To initiate invasive infection, Staphylococcus aureus must adhere to host substrates, such as the extracellular matrix or eukaryotic cells, by virtue of different surface proteins (adhesins). Recently, we identified a 60-kDa cell-secreted extracellular adherence protein (Eap) of S. aureus strain Newman with broad-spectrum binding characteristics (M. Palma, A. Haggar, and J. I. Flock, J. Bacteriol. 181:2840-2845, 1999), and we have molecularly confirmed Eap to be an analogue of the previously identified major histocompatibility complex class II analog protein (Map) (M. Hussain, K. Becker, C. von Eiff, G. Peter, and M. Herrmann, Clin. Diagn. Lab. Immunol. 8:1281-1286, 2001). Previous analyses of the Eap/Map function performed with purified protein did not allow dissection of its precise role in the complex situation of the staphylococcal whole cell presenting several secreted and wall-bound adhesins. Therefore, the role of Eap was investigated by constructing a stable eap::ermB deletion in strain Newman and by complementation of the mutant. Patterns of extracted cell surface proteins analyzed both by sodium dodecyl sulfate-polyacrylamide gel electrophoresis and by Western ligand assays with various adhesive matrix molecules clearly confirmed the absence of Eap in the mutant. However, binding and adhesion tests using whole staphylococcal cells demonstrated that both the parent and mutant strains bound equally well to fibronectin- and fibrinogen-coated surfaces, possibly due to their recognition by other staphylococcal adhesins. Furthermore, Eap mediated staphylococcal agglutination of both wild-type and mutant cells. In contrast, the mutant adhered to a significantly lesser extent to cultured fibroblasts (P < 0.001) than did the wild type, while adherence was restorable upon complementation. Furthermore, adherence to both epithelial cells (P < 0.05) and fibroblasts (not significant) could be blocked with antibodies against Eap, whereas preimmune serum was not active

  1. Radio emission from cosmic particle cascades

    NASA Astrophysics Data System (ADS)

    Buitink, Stijn Jan

    2009-10-01

    STJ (Superconducting Tunneling Junctions) are being developed as spectro-photometers in wavelengths ranging from the NIR to X-rays. 10x12 arrays of STJs have already been successfully used as optical imaging spectrometers with the S-Cam 3, on the William Hershel Telescope on La Palma and on the Optical Ground Station on Tenerife. To overcome the limited field of view which can be achieved with single STJ arrays, DROIDS (Distributed Read Out Imaging Devices) are being developed which produce next to energy and timing also produce positional information with each detector element. These DROIDS consist of a superconducting absorber strip with proximized STJs on either end. The STJs are a Ta/Al/AlOx/Al/Ta 100/30/1/30/100nm sandwich of which the bottom electrode Ta layer is one with the 100nm thick absorber layer. The ratio of the two signals from the STJs provides information on the absorption position and the sum signal is a measure for the energy of the absorbed photon. In this thesis we present different important processes which are involved with the detection of optical photons using DROIDs. This includes the spatial and spectral resolution, confinement of the quasiparticles in the proximized STJs to enhance tunnelling and quasiparticle creation resulting from absorption of a photon in the proximized STJ. We have combined our findings in the development of a 2D theoretical model which describes the diffusion of quasiparticles and imperfect confinement via exchange of quasiparticles between the absorber and STJ. Finally we will present some of the first results obtained with an array of 60 360x33.5 μm2 DROIDs in 3x20 format.

  2. Distributed Read-out Imaging Device array for astronomical observations in UV/VIS

    NASA Astrophysics Data System (ADS)

    Hijmering, Richard A.

    2009-12-01

    STJ (Superconducting Tunneling Junctions) are being developed as spectro-photometers in wavelengths ranging from the NIR to X-rays. 10x12 arrays of STJs have already been successfully used as optical imaging spectrometers with the S-Cam 3, on the William Hershel Telescope on La Palma and on the Optical Ground Station on Tenerife. To overcome the limited field of view which can be achieved with single STJ arrays, DROIDS (Distributed Read Out Imaging Devices) are being developed which produce next to energy and timing also produce positional information with each detector element. These DROIDS consist of a superconducting absorber strip with proximized STJs on either end. The STJs are a Ta/Al/AlOx/Al/Ta 100/30/1/30/100nm sandwich of which the bottom electrode Ta layer is one with the 100nm thick absorber layer. The ratio of the two signals from the STJs provides information on the absorption position and the sum signal is a measure for the energy of the absorbed photon. In this thesis we present different important processes which are involved with the detection of optical photons using DROIDs. This includes the spatial and spectral resolution, confinement of the quasiparticles in the proximized STJs to enhance tunnelling and quasiparticle creation resulting from absorption of a photon in the proximized STJ. We have combined our findings in the development of a 2D theoretical model which describes the diffusion of quasiparticles and imperfect confinement via exchange of quasiparticles between the absorber and STJ. Finally we will present some of the first results obtained with an array of 60 360x33.5 μm2 DROIDs in 3x20 format.

  3. The Mass of Kepler-93b and The Composition of Terrestrial Planets

    NASA Astrophysics Data System (ADS)

    Dressing, Courtney D.; Charbonneau, David; Dumusque, Xavier; Gettel, Sara; Pepe, Francesco; Collier Cameron, Andrew; Latham, David W.; Molinari, Emilio; Udry, Stéphane; Affer, Laura; Bonomo, Aldo S.; Buchhave, Lars A.; Cosentino, Rosario; Figueira, Pedro; Fiorenzano, Aldo F. M.; Harutyunyan, Avet; Haywood, Raphaëlle D.; Johnson, John Asher; Lopez-Morales, Mercedes; Lovis, Christophe; Malavolta, Luca; Mayor, Michel; Micela, Giusi; Motalebi, Fatemeh; Nascimbeni, Valerio; Phillips, David F.; Piotto, Giampaolo; Pollacco, Don; Queloz, Didier; Rice, Ken; Sasselov, Dimitar; Ségransan, Damien; Sozzetti, Alessandro; Szentgyorgyi, Andrew; Watson, Chris

    2015-02-01

    Kepler-93b is a 1.478 ± 0.019 R ⊕ planet with a 4.7 day period around a bright (V = 10.2), astroseismically characterized host star with a mass of 0.911 ± 0.033 M ⊙ and a radius of 0.919 ± 0.011 R ⊙. Based on 86 radial velocity observations obtained with the HARPS-N spectrograph on the Telescopio Nazionale Galileo and 32 archival Keck/HIRES observations, we present a precise mass estimate of 4.02 ± 0.68 M ⊕. The corresponding high density of 6.88 ± 1.18 g cm-3 is consistent with a rocky composition of primarily iron and magnesium silicate. We compare Kepler-93b to other dense planets with well-constrained parameters and find that between 1 and 6 M ⊕, all dense planets including the Earth and Venus are well-described by the same fixed ratio of iron to magnesium silicate. There are as of yet no examples of such planets with masses >6 M ⊕. All known planets in this mass regime have lower densities requiring significant fractions of volatiles or H/He gas. We also constrain the mass and period of the outer companion in the Kepler-93 system from the long-term radial velocity trend and archival adaptive optics images. As the sample of dense planets with well-constrained masses and radii continues to grow, we will be able to test whether the fixed compositional model found for the seven dense planets considered in this paper extends to the full population of 1-6 M ⊕ planets. Based on observations made with the Italian Telescopio Nazionale Galileo (TNG) operated on the island of La Palma by the Fundación Galileo Galilei of the INAF (Istituto Nazionale di Astrofisica) at the Spanish Observatorio del Roque de los Muchachos of the Instituto de Astrofisica de Canarias.

  4. A CENSUS OF AM CVn STARS: THREE NEW CANDIDATES AND ONE CONFIRMED 48.3-MINUTE BINARY

    SciTech Connect

    Rau, A.; Roelofs, G. H. A.; Steeghs, D.; Groot, P. J.; Nelemans, G.; Marsh, T. R.; Salvato, M.; Kasliwal, M. M.

    2010-01-01

    We present three new candidate AM CVn binaries, and one confirmed new system, from a spectroscopic survey of color-selected objects from the Sloan Digital Sky Survey (SDSS). All four systems were found from their helium emission lines in low-resolution spectra taken on the Hale telescope at Palomar, the Nordic Optical Telescope, and the William Herschel Telescope on La Palma. The ultra-compact binary nature of SDSS J090221.35+381941.9 was confirmed using phase-resolved spectroscopy at the Keck-I telescope. From the characteristic radial velocity 'S-wave' observed in the helium emission lines, we measure an orbital period of 48.31 +- 0.08 minutes. The continuum emission can be described with a blackbody or a helium white dwarf atmosphere of T{sub eff} approx 15,000 K, in agreement with theoretical cooling models for relatively massive accretors and/or donors. The absence in the spectrum of broad helium absorption lines from the accreting white dwarf suggests that the accreting white dwarf cannot be much hotter than 15,000 K, or that an additional component such as the accretion disk contributes substantially to the optical flux. Two of the candidate systems, SDSS J152509.57+360054.5 and SDSS J172102.48+273301.2, do show helium absorption in the blue part of their spectra in addition to the characteristic helium emission lines. This in combination with the high effective temperatures of approx18,000 K and approx16,000 K suggests both to be at orbital periods below approx40 minutes. The third candidate, SDSS J164228.06+193410.0, exhibits remarkably strong helium emission on top of a relatively cool (T{sub eff} approx 12,000 K) continuum, indicating an orbital period above approx50 minutes.

  5. Comparative internal kinematics of the H II regions in interacting and isolated galaxies: implications for massive star formation modes

    NASA Astrophysics Data System (ADS)

    Zaragoza-Cardiel, Javier; Beckman, John E.; Font, Joan; García-Lorenzo, Begoña; Camps-Fariña, Artemi; Fathi, Kambiz; James, Philip A.; Erroz-Ferrer, Santiago; Barrera-Ballesteros, Jorge; Cisternas, Mauricio

    2015-08-01

    We have observed 12 interacting galaxy pairs using the Fabry-Perot interferometer GH αFaS (Galaxy H α Fabry-Perot system) on the 4.2-m William Herschel Telescope at the Observatorio del Roque de los Muchachos, La Palma. We present here the Hα surface brightness, velocity and velocity dispersion maps for the 10 systems we have not previously observed using this technique, as well as the physical properties (sizes, Hα luminosities and velocity dispersion) of 1259 H II regions from the full sample. We also derive the physical properties of 1054 H II regions in a sample of 28 isolated galaxies observed with the same instrument in order to compare the two populations of H II regions. We find a population of the brightest H II regions for which the scaling relations, for example the relation between the Hα luminosity and the radius, are clearly distinct from the relations for the regions of lower luminosity. The regions in this bright population are more frequent in the interacting galaxies. We find that the turbulence, and also the star formation rate (SFR), are enhanced in the H II regions in the interacting galaxies. We have also extracted the Hα equivalent widths for the H II regions of both samples, and we have found that the distribution of H II region ages coincides for the two samples of galaxies. We suggest that the SFR enhancement is brought about by gas flows induced by the interactions, which give rise to gravitationally bound gas clouds which grow further by accretion from the flowing gas, producing conditions favourable to star formation.

  6. Stellar occultation by (119951) 2002 KX14 on April 26, 2012

    NASA Astrophysics Data System (ADS)

    Alvarez-Candal, A.; Ortiz, J. L.; Morales, N.; Jiménez-Teja, Y.; Duffard, R.; Sicardy, B.; Dhillon, V. S.; Marsh, T.; Littlefair, S.; Mottola, S.; Hellmich, S.; Shahbaz, T.

    2014-11-01

    Context. Trans-Neptunian objects (TNOs) are important bodies, but very little is known about their basic physical properties such as size, density, and albedo. Aims: We intend to determine sizes, albedos, and even densities of a good sample of TNOs, especially those of the largest TNOs because they can be studied the best with different observational techniques. Methods: We took advantage of a stellar occultation by (119951) 2002 KX14 to obtain valuable information by means of high temporal resolution CCD imaging using ULTRACAM at the 4.2 m William Herschel Telescope on La Palma (Spain). Results: Thanks to the high time resolution of ULTRACAM and the large aperture provided by the telescope, we recorded the most accurate chord ever obtained for an occultation by a TNO, with a length of 415 ± 1 km. This is a lower limit to the diameter of (119951) 2002 KX14 assuming that it has a spherical shape. For ellipsoidal objects we developed a method for obtaining equivalent diameters by combining single-chord occultations and accurate astrometry at the time of occultation. By applying this method to (119951) 2002 KX14, we estimate an equal-area equivalent diameter of at least 365+30-21 km. A possible upper limit is 455 ± 27 km, obtained via thermal data. No atmosphere is detected. We obtain a surface temperature higher than 40 K, which precludes the existence of ices, other than water ice, upon the surface, which is consistent with the featureless spectrum of (119951) 2002 KX14. There are no secondary occultation events that could reveal whether there is a ring system, as recently found for the Centaur (10199) Chariklo.

  7. Characterization of the Optical and X-ray Properties of the Northwestern Wisps in the Crab Nebula

    NASA Technical Reports Server (NTRS)

    Weisskopf, M. C.; Tennant, A.; Schweizer, T.; Bucciantini, N.; Nilsson, K.

    2013-01-01

    We have studied the variability of the Crab Nebula both in the visible and in X -rays. Optical observations were obtained using the Nordic Optical Telescope in La Palma and X -ray observations were made with the Chandra X -Ray Observatory. We observe wisps forming and peeling off from the region commonly associated with the termination shock of the pulsar wind. We measure a number of properties of the wisps to the Northwest of the pulsar. We find that the exact locations of the wisps in the optical and in X-rays are similar but not coincident, with the X-ray wisp preferentially located closer to the pulsar. Our measurements and their implications are interpreted in terms of a MHD model. We find that the optical wisps are more strongly Doppler boosted than X-ray wisps, a result inconsistent with current MHD simulations. Indeed the inferred optical boosting factors exceed MHD simulation values by about one order of magnitude. These findings suggest that the optical and X-ray wisps are not produced by the same particle distribution, a result which is consistent with the spatial differences. Further, the X -ray wisps and optical wisps are apparently developing independently from each other, but every time a new X ]ray wisp is born so is an optical wisp, thus pointing to a possible common cause or trigger. Finally, we find that the typical wisp formation rate is approximately once per year, interestingly at about the same rate of production of the large gamma-ray flares.

  8. Characterization of the Optical and X-ray Properties of the Northwestern Wisps in the Crab Nebula

    NASA Astrophysics Data System (ADS)

    Weisskopf, Martin C.; Schweitzer, T.; Bucciantini, N.; Idec, W.; Nilsson, K.; Tennant, A.; Zanin, R.

    2013-04-01

    We have studied the variability of the Crab Nebula both in the visible and in X-rays. Optical observations were obtained using the Nordic Optical Telescope in La Palma and X-ray observations were made with the Chandra X-Ray Observatory. We observe wisps forming and peeling off from the region commonly associated with the termination shock of the pulsar wind. We measure a number of properties of the wisps to the Northwest of the pulsar. We find that the exact locations of the wisps in the optical and in X-rays are similar but not coincident, with the X-ray wisp preferentially located closer to the pulsar. Our measurements and their implications are interpreted in terms of a MHD model. We find that the optical wisps are more strongly Doppler boosted than X-ray wisps, a result inconsistent with current MHD simulations. Indeed the inferred optical boosting factors exceed MHD simulation values by about one order of magnitude. These findings suggest that the optical and X-ray wisps are not produced by the same particle distribution, a result which is consistent with the spatial differences. Further, the X-ray wisps and optical wisps are apparently developing independently from each other, but every time a new X-ray wisp is born so is an optical wisp, thus pointing to a possible common cause or trigger. Finally, we find that the typical wisp formation rate is approximately once per year, interestingly at about the same rate of production of the large gamma-ray flares.

  9. NGC 6778: a disrupted planetary nebula around a binary central star

    NASA Astrophysics Data System (ADS)

    Guerrero, M. A.; Miranda, L. F.

    2012-03-01

    The planetary nebula (PN) NGC 6778 harbors a binary central star with a short orbital period and displays two systems of fast collimated outflows. To assess the influence of the evolution through a common-envelope phase of the binary system of NGC 6778 on its formation and shaping, we have used narrow-band images and high-dispersion long-slit spectra of the nebula to investigate its detailed morphology and kinematics. We find that the overall structure of NGC 6778 can be described as a bipolar PN. The equatorial ring is highly disrupted and many radial features (filamentary wisps and cometary knots) also show strong dynamical effects. There are clear connections between the bipolar lobes and the fast collimated outflows: the collimated outflows seem to arise from bright knots at the tips of the bipolar lobes, whereas the kinematics of the bipolar lobes is distorted. We suggest that the interaction of the fast collimated outflows of NGC 6778 with its nebular envelope has resulted in the disruption of the nebular shell and equatorial ring. Based on observations made with the Nordic Optical Telescope (NOT) and the Italian Telescopio Nazionale Galileo (TNG) on the island of La Palma in the Spanish Observatorio del Roque de los Muchachos of the Instituto de Astrofísica de Canarias (IAC). NOT is operated jointly by Denmark, Finland, Iceland, Norway, and Sweden. TNG is operated by the Fundación Galileo Galilei of the INAF (Istituto Nazionale di Astrofisica). The data presented here were obtained in part with ALFOSC, which is provided by the Instituto de Astrofísica de Andalucía (IAA) under a joint agreement with the University of Copenhagen and NOTSA.

  10. The New Generation Astronomical Telescopes Project

    NASA Astrophysics Data System (ADS)

    Bode, M. F.

    This 2.6 million-pound project, based in Liverpool (Merseyside) has three aims: the regeneration of regional industry; fostering scientific education and public understanding of science and technology, and research in astrophysics. The project partners are Liverpool John Moores University, Royal Greenwich Observatory, and National Museums and Galleries on Merseyside. The project received a major grant from the European Union. We see it as of potentially great interest to developing countries who might adapt it to optimise benefits from future astronomy programmes. We are constructing the 2m Liverpool Telescope (LT), the World's largest robotic telescope, to be operational on La Palma (Canaries) in 1999, as the prototype of a range of high-specification 1m to 3m-class telescopes, with relatively low capital and operating costs, to be constructed jointly by RGO and JMU. LT's fully-automated operating mode will allow it to undertake, much less expensively, many programmes which are difficult, or impossible, on conventional telescopes. A second 2m is being built by us for a group in India. Surveying the U.K. community showed that LT would be around 8 times over-subscribed ensuring, with efficient peer review, front-rank science. Although most observing time is for research, around 5% will be reserved for science education and public understanding of science. The U.K. Particle Physics and Astronomy Research Council funded a pilot study of providing data from the telescope to schools and colleges. A progress report on this aspect will be available in Kyoto.

  11. Search for giant planets in M67. III. Excess of hot Jupiters in dense open clusters

    NASA Astrophysics Data System (ADS)

    Brucalassi, A.; Pasquini, L.; Saglia, R.; Ruiz, M. T.; Bonifacio, P.; Leão, I.; Canto Martins, B. L.; de Medeiros, J. R.; Bedin, L. R.; Biazzo, K.; Melo, C.; Lovis, C.; Randich, S.

    2016-07-01

    Since 2008 we used high-precision radial velocity (RV) measurements obtained with different telescopes to detect signatures of massive planets around main-sequence and evolved stars of the open cluster (OC) M67. We aimed to perform a long-term study on giant planet formation in open clusters and determine how this formation depends on stellar mass and chemical composition. A new hot Jupiter (HJ) around the main-sequence star YBP401 is reported in this work. An update of the RV measurements for the two HJ host-stars YBP1194 and YBP1514 is also discussed. Our sample of 66 main-sequence and turnoff stars includes 3 HJs, which indicates a high rate of HJs in this cluster (5.6% for single stars and 4.5%% for the full sample). This rate is much higher than what has been discovered in the field, either with RV surveys or by transits. High metallicity is not a cause for the excess of HJs in M67, nor can the excess be attributed to high stellar masses. When combining this rate with the non-zero eccentricity of the orbits, our results are qualitatively consistent with a HJ formation scenario dominated by strong encounters with other stars or binary companions and subsequent planet-planet scattering, as predicted by N-body simulations. Based on observations collected at the ESO 3.6 m telescope (La Silla), at the 1.93 m telescope of the Observatoire de Haute-Provence (OHP), at the Hobby Eberly Telescope (HET), at the Telescopio Nazionale Galileo (TNG, La Palma) and at the Euler Swiss Telescope.

  12. The GRB 030329 host: a blue low metallicity subluminous galaxy with intense star formation

    NASA Astrophysics Data System (ADS)

    Gorosabel, J.; Pérez-Ramírez, D.; Sollerman, J.; de Ugarte Postigo, A.; Fynbo, J. P. U.; Castro-Tirado, A. J.; Jakobsson, P.; Christensen, L.; Hjorth, J.; Jóhannesson, G.; Guziy, S.; Castro Cerón, J. M.; Björnsson, G.; Sokolov, V. V.; Fatkhullin, T. A.; Nilsson, K.

    2005-12-01

    We present broad band photometry and spectroscopic observations of the host galaxy of GRB 030329. Analysis of the spectral emission lines shows that the host is likely a low metallicity galaxy (Z˜0.004). The spectral energy distribution (SED) constructed with the photometric points has been fitted using synthetic and observational templates. The best SED fit is obtained with a starburst template with an age of 150 Myr and an extinction Av ˜ 0.6. We find that the GRB 030329 host galaxy is a subluminous galaxy (L ˜ 0.016 Lstar) with a stellar mass of ≳ 108 M⊙. Three independent diagnostics, based on the restframe UV continuum, the [O II], and the Balmer emission lines, provide a consistent unextinguished star formation rate of ˜ 0.6 M⊙ yr-1, implying a high unextinguished specific star formation rate ( 34 M⊙ yr-1 (L/Lstar)-1). We estimate that the unextinguished specific star formation rate of the GRB 030329 host is higher than 93.5% of the galaxies at a similar redshift. Based on observations made with the Nordic Optical Telescope, operated on the island of La Palma jointly by Denmark, Finland, Iceland, Norway, and Sweden, in the Spanish Observatorio del Roque de los Muchachos of the Instituto de Astrofísica de Canarias. Based on data taken at the 2.2-m and 3.5-m telescopes of the Centro Astronómico Hispano Alemán de Calar Alto, operated by the Max Planck institute of Heidelberg and Centro Superior de Investigaciones Científicas. The spectral observations were obtained at the European Southern Observatory, Cerro Paranal (Chile), under the Director's Discretionary Time programme 271.D-5006(A).

  13. Bioclimatic and vegetation mapping of a topographically complex oceanic island applying different interpolation techniques.

    PubMed

    Garzón-Machado, Víctor; Otto, Rüdiger; del Arco Aguilar, Marcelino José

    2014-07-01

    Different spatial interpolation techniques have been applied to construct objective bioclimatic maps of La Palma, Canary Islands. Interpolation of climatic data on this topographically complex island with strong elevation and climatic gradients represents a challenge. Furthermore, meteorological stations are not evenly distributed over the island, with few stations at high elevations. We carried out spatial interpolations of the compensated thermicity index (Itc) and the annual ombrothermic Index (Io), in order to obtain appropriate bioclimatic maps by using automatic interpolation procedures, and to establish their relation to potential vegetation units for constructing a climatophilous potential natural vegetation map (CPNV). For this purpose, we used five interpolation techniques implemented in a GIS: inverse distance weighting (IDW), ordinary kriging (OK), ordinary cokriging (OCK), multiple linear regression (MLR) and MLR followed by ordinary kriging of the regression residuals. Two topographic variables (elevation and aspect), derived from a high-resolution digital elevation model (DEM), were included in OCK and MLR. The accuracy of the interpolation techniques was examined by the results of the error statistics of test data derived from comparison of the predicted and measured values. Best results for both bioclimatic indices were obtained with the MLR method with interpolation of the residuals showing the highest R2 of the regression between observed and predicted values and lowest values of root mean square errors. MLR with correction of interpolated residuals is an attractive interpolation method for bioclimatic mapping on this oceanic island since it permits one to fully account for easily available geographic information but also takes into account local variation of climatic data.

  14. Application of emulsion imaging system for cosmic-ray muon radiography to explore the internal structure of Teide and Cumbre Vieja volcanoes in the Canary Islands, Spain

    NASA Astrophysics Data System (ADS)

    Hernandez Perez, P. A.; Tanaka, H.; Miyamoto, S.; Perez, N.; Barrancos, J.; Padron, E.; Hernandez, I.

    2012-12-01

    The internal structure of volcanoes, especially in their up per part, is product of past eruptions. Therefore, the knowledge of the internal structure of a volcano is of great importance for understanding its behaviour and to forecast the nature and style of the next eruptions. For these reasons, during past years scientists have made a big effort to investigate the internal structure of the volcanoes with different geophysical techniques, including deep drilling, passive and active seismic tomography, geoelectrics and magnetotellurics and gravimetry. One of the limits of conventional geophysical methods is the spatial resolution, which typically ranges between some tens of meters up to 1 km. In this sense, the radiography of active volcanoes based on natural muons, even if limited to the external part of the volcano, represents an important tool for investigating the internal structure of a volcano at higher spatial resolution (Macedonio and Martini, 2009). Moreover, muon radiography is able to resolve density contrasts of the order of 1-3%, significantly greater than the resolution obtained with conventional methods. As example, the experiment of muon radiography carried out at Mt. Asama volcano by Tanaka et al., 2007, allowed the reconstruction of the density map of the cone and detection of a dense region that corresponds to the position and shape of a lava deposit created during the last eruption in 2004. In the framework of a research project financed by the Canary Agency of Research, Innovation and Information Society, we will implement muon measurements at Teide volcano in Tenerife Island and Cumbre Vieja volcano in La Palma Island, Canary Islands, to radiographically image the subsurface structure of these two volcanic edifices. The data analysis will involve the study both of the shallow structure of both volcanoes and of the requirements for the implementation of the muon detectors. Both Cumbre Vieja and Teide are two active volcanoes that arouse great

  15. Application of emulsion imaging system for cosmic-ray muon radiography to explore the internal structure of Teide and Cumbre Vieja volcanoes in the Canary Islands, Spain

    NASA Astrophysics Data System (ADS)

    Hernández, Iñigo; Hernández, Pedro; Pérez, Nemesio; Tanaka, Hiroyuki; Miyamoto, Seygo; Barrancos, José; Padrón, Eleazar

    2013-04-01

    The internal structure of volcanoes, especially in their up per part, is product of past eruptions. Therefore, the knowledge of the internal structure of a volcano is of great importance for understanding its behaviour and to forecast the nature and style of the next eruptions. For these reasons, during past years scientists have made a big effort to investigate the internal structure of the volcanoes with different geophysical techniques, including deep drilling, passive and active seismic tomography, geoelectrics and magnetotellurics and gravimetry. One of the limits of conventional geophysical methods is the spatial resolution, which typically ranges between some tens of meters up to 1 km. In this sense, the radiography of active volcanoes based on natural muons, even if limited to the external part of the volcano, represents an important tool for investigating the internal structure of a volcano at higher spatial resolution (Macedonio and Martini, 2009). Moreover, muon radiography is able to resolve density contrasts of the order of 1-3%, significantly greater than the resolution obtained with conventional methods. As example, the experiment of muon radiography carried out at Mt. Asama volcano by Tanaka et al., 2007, allowed the reconstruction of the density map of the cone and detection of a dense region that corresponds to the position and shape of a lava deposit created during the last eruption in 2004. In the framework of a research project financed by the Canary Agency of Research, Innovation and Information Society, we will implement muon measurements at Teide volcano in Tenerife Island and Cumbre Vieja volcano in La Palma Island, Canary Islands, to radiographically image the subsurface structure of these two volcanic edifices. The data analysis will involve the study both of the shallow structure of both volcanoes and of the requirements for the implementation of the muon detectors. Both Cumbre Vieja and Teide are two active volcanoes that arouse great

  16. Selection of stars to calibrate Gaia

    NASA Astrophysics Data System (ADS)

    Carrasco, J. M.; Voss, H.; Jordi, C.; Fabricius, C.; Pancino, E.; Altavilla, G.

    2015-05-01

    Gaia is an all-sky survey satellite, launched by ESA on 19th December 2013, to obtain parallaxes and proper motions to microarcsecond level precision, radial velocities and astrophysical parameters for about one billion objects down to a limiting magnitude of 20. The chosen strategy to perform the photometric calibration is to split the process into two steps, internal and external calibration. The internal calibration will combine all different transits of a given source to a common reference internal system producing a 'mean' Gaia observation. This internal calibration accounts for the differential instrumental effects (in sensitivity, aperture, PSF, etc.). They depend on the colour and type of the source. For this reason, a selection of calibration sources ensuring a good representation of all kind of observed sources is needed. The entire magnitude and colour range of the sources have to be covered by these calibration stars and for all calibration intervals. It is a challenge to obtain a suitable colour distribution for the standards, especially for bright sources and the daily large scale calibration intervals. Once the mean Gaia observations are produced, a final step, the external calibration, transforms them to absolute fluxes and wavelengths. In principle, few calibration sources are needed (about 200 spectrophotometric standard stars, SPSS, are currently being considered). They need to have accurate determinations of their absolute fluxes and their non-variability need to be ensured below 1% precision. For this purpose, a big international observational effort is being done (using telescopes as 2.2m@CAHA, TNG@LaPalma, NTT@LaSilla, LaRuca@SPM, and others). During this observational effort some cases of non-expected variability of the SPSS candidates have been discovered.

  17. Overview Of Cal-Mex 2010: US-Mexico Collaborative Project On Air Quality And Climate Change In The California-Mexico Border Region

    NASA Astrophysics Data System (ADS)

    Molina, L. T.; Cal-Mex Science Team

    2010-12-01

    The composition of the atmosphere over the US-Mexico border region is affected by cross-border transport of emissions in both directions. Air quality issues in the California-Mexico (Cal-Mex) border are associated with air masses originating in the portion of the border region adjacent to California, which includes two of the sister city pairs (Tijuana-San Diego and Mexicali-Calexico) that have the most severe air pollution problems, posing a serious health threat to their inhabitants as well as affecting ecosystem viability and regional climate for large downwind distances. During May-June 2010, an intensive field study was undertaken by US-Mexico collaborative teams to characterize the major sources of primary and secondary particulate matter and precursor gases in the California-Mexico (Cal-Mex) border region, their transport and transformation, and the impact of these emissions on regional air quality and climate. The ground-based measurements included a central fixed site located in Tijuana that housed state-of-the-science instruments to measure gases, aerosols, radiation and meteorological parameters; a mobile eddy covariance laboratory that measured surface-atmosphere exchange fluxes of carbon dioxide, nitrogen oxides, and particle number; several mobile units for criteria pollutants and meteorological parameters; and measurements of fine particles and trace gases at the border crossing areas. Preliminary results from the field study will be presented. Cal-Mex Science Team includes: Molina Center for Energy and the Environment, Texas A & M University, Scripps Institution of Oceanography/University of California at San Diego, Virginia Tech, San Diego State University, National University of Mexico, National Institute of Ecology/Mexican Ministry of the Environment, University of the State of Morelos, LT Consulting Group, University of Baja California (Mexicali, Tijuana, Ensenada, Valle de Las Palmas campuses), Secretary of the Environment of Baja California

  18. THE FILLING FACTOR-RADIUS RELATION FOR 58 H II REGIONS ACROSS THE DISK OF NGC 6946

    SciTech Connect

    Cedres, Bernabe; Beckman, John E.; Bongiovanni, Angel; Cepa, Jordi; Asensio Ramos, Andres; Cabrera-Lavers, Antonio; Giammanco, Corrado; Alfaro, Emilio J.

    2013-03-01

    Using the OSIRIS tunable narrowband imager on the 10.4 m GTC (La Palma), we have mapped the SAB(rs)cd galaxy NGC 6946 over a {approx}7.3 Multiplication-Sign 7.5 arcmin{sup 2} field in the emission lines of the [S II] {lambda}{lambda}6717, 6731 doublet, and in H{alpha}. From these maps we have produced catalogs of the H{alpha} luminosities and effective radii of 557 H II regions across the disk, and derived the [S II] emission line ratios of 370 of these. The H{alpha} observations were used to derive the mean luminosity-weighted electron densities for the regions of the sample, while the [S II] line ratios allowed us to derive values of the in situ electron densities in the denser zones from which the major fraction of the radiation in these lines is emitted for 58 of the regions. This is by far the largest data set of its kind for a single galaxy. A classical two-phase model is used to derive the filling factors of the regions. We find that although the mean electron density decreases with the square root of the radius of the regions, the in situ density is essentially independent of this radius. Thus the filling factor falls systematically, as the radius and the luminosity of the regions increases, with a power law of exponent -2.23 between filling factor and radius. These measurements should enhance the perspectives for more refined physical models of H II regions.

  19. The nature of the KFR08 stellar stream. A chemical tagging experiment

    NASA Astrophysics Data System (ADS)

    Liu, C.; Feltzing, S.; Ruchti, G.

    2015-08-01

    The origin of the new kinematically identified metal-poor stellar stream, the KFR08 stream, has not been established to date. We present stellar parameters, stellar ages, and detailed elemental abundances for Na, Mg, Al, Si, Ca, Sc, Ti, Cr, Ni, Zn, Sr, Y, Zr, Ba, La, and Eu for 16 KFR08 stream members based on an analysis of high-resolution spectra. Based on the abundance ratios of 14 elements, we use the chemical tagging method to identify the stars with the same chemical composition that therefore might have a common birthplace, such as a cluster. Although three stars were tagged with similar elemental abundances ratios, we find that, statistically, it is not certain that they originate from a dissolved star cluster. This conclusion is consistent with the large dispersion of [Fe/H] (σ[ Fe / H ] = 0.29) among the 16 stream members. We find that our stars are α enhanced and that the abundance patterns of the stream members match the thick-disc population well. In addition, most of the stream stars have estimated stellar ages greater than 11 Gyr. These results, together with the hot kinematics of the stream stars, suggest that the KFR08 stream originated from the thick-disc population, which was perturbed by a massive merger in the early Universe. Based on observations made with Nordic Optical Telescope at La Palma under programme 44-014 and on data obtained from the ESO Science Archive Facility under programme ID 071.B-0529(A), 072.C-0488(E), 077.C-0192(A), 082.B-0610(A), 085.C-0062(A).

  20. VizieR Online Data Catalog: YSOs search in LDN 1340 in optical (Kun+, 2016)

    NASA Astrophysics Data System (ADS)

    Kun, M.; Moor, A.; Szegedi-Elek, E.; Reipurth, B.

    2016-08-01

    We observed the optical spectra of 23 stars, utilizing several instruments, namely CAFOS with the G-100 grism, installed on the 2.2m telescope of the Calar Alto Observatory, FAST on the 1.5m telescope of the Fred Lawrence Whipple Observatory, ALFOSC with grism 8 on the Nordic Optical Telescope in the Observatorio del Roque de los Muchachos in La Palma, and the low-resolution slit spectrograph operated on the 1m RCC telescope of the Konkoly Observatory between 1999 Aug 07 and 2011 Sep 27 (see table 1). We observed L1340 with the Wide Field Grism Spectrograph 2 (WFGS2), installed on the University of Hawaii 2.2m telescope, on 2011 January 1, October 15, 16, and 18, and 2012 August 10. We covered an area of 30x40arcmin, centered on RA=2:30,DE=72:48(J2000), with a mosaic of 12 overlapping fields. We found 75 stars with Hα emission by examining the images visually. See section 2.2 and table 2. Spitzer L1340 was observed by the Spitzer Space Telescope using Spitzer's Infrared Array Camera (IRAC) on 2009 March 16 and by the Multiband Imaging Photometer for Spitzer (MIPS) on 2008 November 26 (Prog. ID: 50691, PI: G. Fazio). A small part of the cloud, centered on RNO 7, was observed in the four IRAC bands on 2006 September 24 (Prog. ID: 30734, PI: D. Figer). All but eight of the Hα sources have counterparts in the AllWISE Source Catalog (Wright et al. 2010AJ....140.1868W; see II/328). L1340 is situated within Stripe 1260 of the SEGUE survey (Yanny et al. 2009, J/AJ/137/4377). Each of our target stars has a counterpart in the SDSS Data Release 9 (Ahn et al. 2012, V/139) within 1" of the 2MASS position. (6 data files).

  1. Constraints on values of biological parameters by observed turbulence in a quasi-2D phytoplankton model of the North Atlantic

    NASA Astrophysics Data System (ADS)

    Hahn-Woernle, Lisa; Dijkstra, Henk A.; van der Woerd, Hans J.

    2013-04-01

    Constraints on values of biological parameters by observed turbulence in a quasi-2D phytoplankton model of the North Atlantic Session and Session Number: Scaling and complex Physical and Biogeophysical Processes in the Atmosphere, Ocean and climate (NP3.1) Preferred Mode of Presentation: Oral Lisa Hahn-Woernle¹, Henk A. Dijkstra¹ & Hans J. van der Woerd² 1. Institute for Marine and Atmospheric research Utrecht, Utrecht University, Princetonplein 5, 3584 CC Utrecht, The Netherlands. 2. Institute for Environmental Studies, VU University, De Boelelaan 1085, 1081 HV Amsterdam, The Netherlands. During the STRATIPHYT cruises in Summer 2009 and Spring 2011 in-situ plankton and nutrient concentrations as well as upper-ocean turbulence characteristics were measured from Las Palmas to Reykjavik [1,2]. The measurements agree with previous findings that the incoming light intensity and the stratification of the upper ocean set important conditions for the initiation of the phytoplankton bloom close to the surface and also for a possible shift to a deep chlorophyll maximum below the mixed layer. These strong characteristic spatial patterns and temporal cycles of phytoplankton surface concentration are also observed in satellite images of chlorophyll-a concentration in the Northern Atlantic. To understand the meridional depth (upper 200 m) variation of the phytoplankton distributions, a quasi-2D phytoplankton model was used. The results indicate that with the given profiles of the turbulent vertical mixing coefficient, only a very limited interval for the biological model parameters leads to the observed depth of the phytoplankton maximum. [1] E. Jurado, H. van der Woerd and H. A. Dijkstra, Microstructure measurements along a quasi-meridional transect in the North Atlantic, J. Geophysical Res. Oceans, 117, C04016, doi:10.1029/2011JC007137, (2012). [2] E. Jurado, H. A. Dijkstra and H. van der Woerd, Microstructure observations during the spring 2011 STRATIPHYT-II cruise in the

  2. GAS CLOUDS RAINING STAR STUFF ONTO MILKY WAY GALAXY

    NASA Technical Reports Server (NTRS)

    2002-01-01

    This composite radio light image and rendition of our galaxy as seen in visible light shows enigmatic 'high-velocity clouds' of gas high above the plane of the Milky Way which rain gas into the galaxy, seeding it with the stuff of stars. The cloud outlined, and possibly others too, is now known to have low heavy element content and to be raining down onto the Milky Way disk, seeding it with material for star birth. Identifying this infalling gas helps in solving a long-standing mystery of galactic evolution by revealing a source of the low-metallicity gas required to explain the observed chemical composition of stars near the Sun. In this all-sky projection, the edge-on plane of our galaxy appears as a white horizontal strip. The false-color orange-yellow 'clouds' are regions containing neutral hydrogen, which glows in 21-centimeter radiation. Hubble Space Telescope's spectrograph was aimed at one of the clouds (encircled) to measure its detailed composition and velocity. This discovery is based on a combination of data from NASA's Hubble Space Telescope, three radio telescopes (at Effelsberg in Germany, and Dwingeloo and Westerbork in the Netherlands), the William Herschel Telescope on the island of La Palma and the Wisconsin H-alpha Mapper at NOAO's Kitt Peak Observatory. Photo Credits: Image composite by Ingrid Kallick of Possible Designs, Madison Wisconsin. The background Milky Way image is a drawing made at Lund Observatory. High-velocity clouds are from the survey done at Dwingeloo Observatory (Hulsbosch and Wakker, 1988).

  3. Spitzer/IRAC view of Sh 2-284. Searching for evidence of triggered star formation in an isolated region in the outer Milky Way

    NASA Astrophysics Data System (ADS)

    Puga, E.; Hony, S.; Neiner, C.; Lenorzer, A.; Hubert, A.-M.; Waters, L. B. F. M.; Cusano, F.; Ripepi, V.

    2009-08-01

    Aims: Using Spitzer/IRAC observations of a region to be observed by the CoRoT satellite, we have unraveled a new complex star-forming region at low metallicity in the outer Galaxy. We perform a study of S284 in order to outline the chain of events in this star-forming region. Methods: We used four-band Spitzer/IRAC photometry as well as Hα imaging obtained with INT/WFC. Combining these data with the optical photometry obtained in the frame of CoRoTs preparation and the 2MASS catalog we analysed the properties and distribution of young stellar objects (YSOs) associated with point-like sources. We also studied the SEDs of regions of extended emission, complementing our dataset with IRAS and MSX data. Results: We find that S284 is unique in several ways: it is very isolated at the end of a spiral arm and both the diffuse dust and ionized emission are remarkably symmetric. We have partially resolved the central clusters of the three bubbles present in this region. Despite the different scales observed in its multiple-bubble morphology, our study points to a very narrow spread of ages among the powering high-mass clusters. In contrast, the particular sawtooth structure of the extended emission at the rim of each ionized bubble harbours either small lower-mass clusters with a younger stellar population or individual young reddened protostars. In particular, triggered star formation is considered to be at work in these regions. Based on data obtained with IRAC onboard Spitzer (Program ID 3340) and the WFC at Isaac Newton Telescope at La Palma. Tables 3 and 4 are only available in electronic form at http://www.aanda.org

  4. EMIR, the NIR MOS and Imager for the GTC

    NASA Astrophysics Data System (ADS)

    Garzón, F.; EMIR Team

    2016-10-01

    EMIR is one of the first common-user instruments for the GTC, the 10-meter telescope operating at the Roque de los Muchachos Observatory (La Palma, Canary Islands, Spain). EMIR is being built by a Consortium of Spanish and French institutes led by the Instituto de Astrofísica de Canarias (IAC). EMIR is primarily designed to be operated as a MOS in the near-IR band, but offers a wide range of observing modes, including imaging and spectroscopy, both long slit and multi-object, in the wavelength range 0.9 to 2.5 μm. This contribution reports on the results achieved so far during the verification phase at the IAC prior to the shipment of the instrument to the GTC for being commissioned, which is due by mid 2015. EMIR is equipped with a set of three dispersive elements, one for each of the atmospheric windows J,H & K, formed by the combination of a high quality transmission grating embedded in between of two large prisms of ZnSe; plus a low resolution standard replicated grism, functional in the HK and ZJ windows in first and second dispersion orders respectively. The multi-object capability is achieved by means of the Cold Slit Unit (CSU), a cryogenic robotic reconfigurable multi-slit mask system capable of making user specified patterns with 55 different slitlets distributed across the EMIR focal plane. We will describe the principal units and features of the EMIR instrument and the main results of the verification performed so far with special emphasis on the NIR MOS capabilities. The development and fabrication of EMIR is funded by GRANTECAN and the Plan Nacional de Astronomía y Astrofísica (National Plan for Astronomy and Astrophysics, Spain).

  5. HST luminosity functions of the globular clusters M10, M22, and M55. A comparison with other clusters

    NASA Astrophysics Data System (ADS)

    Piotto, G.; Zoccali, M.

    1999-05-01

    From a combination of deep Hubble Space Telescope V and I images with groundbased images in the same bands, we have obtained color-magnitude diagrams of M10, M22, and M55, extending from just above the hydrogen burning limit to the tip of the red giant branch, down to the white dwarf cooling sequence. We have used the color-magnitude arrays to extract main sequence luminosity functions (LFs) from the turnoff to m ~ 0.13m_sun. The LFs of M10 is significantly steeper than that for the other two clusters. The difference cannot be due to a difference in metallicity. A comparison with the LFs from Piotto et al. (1997), shows a large spread in the LF slopes. This spread is also present in the local mass functions (MFs) obtained from the observed LFs using different theoretical mass-luminosity relations. The dispersion in the MF slopes remains also after removing the mass segregation effects by using multimass King-Michie models. The globular cluster MF slopes are also flatter than the MF slope of the field stars and of the Galactic clusters in the same mass interval. We interpret the MF slope dispersion and the MF flatness as an evidence of dynamical evolution which makes the present day globular cluster stellar MFs different from the initial MFs. The slopes of the present day MFs exclude that the low mass star can be dynamically relevant for the Galactic globular clusters. Based on HST observations retrieved from the ESO ST-ECF Archive, and on observations made at the European Southern Observatory, La Silla, Chile, and at the JKT telescope at La Palma, Islas Canarias.

  6. Time Delay Measurements for the Cluster-lensed Sextuple Quasar SDSS J2222+2745

    NASA Astrophysics Data System (ADS)

    Dahle, H.; Gladders, M. D.; Sharon, K.; Bayliss, M. B.; Rigby, J. R.

    2015-11-01

    We report first results from an ongoing monitoring campaign to measure time delays between the six images of the quasar SDSS J2222+2745, gravitationally lensed by a galaxy cluster. The time delay between A and B, the two most highly magnified images, is measured to be {τ }{{AB}}=47.7+/- 6.0 days (95% confidence interval), consistent with previous model predictions for this lens system. The strong intrinsic variability of the quasar also allows us to derive a time delay value of {τ }{{CA}}=722+/- 24 days between image C and A, in spite of modest overlap between their light curves in the current data set. Image C, which is predicted to lead all the other lensed quasar images, has undergone a sharp, monotonic flux increase of 60%–75% during 2014. A corresponding brightening is firmly predicted to occur in images A and B during 2016. The amplitude of this rise indicates that time delays involving all six known images in this system, including those of the demagnified central images D–F, will be obtainable from further ground-based monitoring of this system during the next few years. Based on observations made with the Nordic Optical Telescope, operated on the island of La Palma jointly by Denmark, Finland, Iceland, Norway, and Sweden, in the Spanish Observatorio del Roque de los Muchachos of the Instituto de Astrofisica de Canarias, and including observations obtained at the Gemini Observatory, which is operated by the Association of Universities for Research in Astronomy, Inc., under a cooperative agreement with the NSF on behalf of the Gemini partnership: the National Science Foundation (United States), the National Research Council (Canada), CONICYT (Chile), the Australian Research Council (Australia), Ministério da Ciência, Tecnologia e Inovação (Brazil) and Ministerio de Ciencia, Tecnologi´a e Innovación Productiva (Argentina).

  7. Quantum teleportation over 143 kilometres using active feed-forward.

    PubMed

    Ma, Xiao-Song; Herbst, Thomas; Scheidl, Thomas; Wang, Daqing; Kropatschek, Sebastian; Naylor, William; Wittmann, Bernhard; Mech, Alexandra; Kofler, Johannes; Anisimova, Elena; Makarov, Vadim; Jennewein, Thomas; Ursin, Rupert; Zeilinger, Anton

    2012-09-13

    The quantum internet is predicted to be the next-generation information processing platform, promising secure communication and an exponential speed-up in distributed computation. The distribution of single qubits over large distances via quantum teleportation is a key ingredient for realizing such a global platform. By using quantum teleportation, unknown quantum states can be transferred over arbitrary distances to a party whose location is unknown. Since the first experimental demonstrations of quantum teleportation of independent external qubits, an internal qubit and squeezed states, researchers have progressively extended the communication distance. Usually this occurs without active feed-forward of the classical Bell-state measurement result, which is an essential ingredient in future applications such as communication between quantum computers. The benchmark for a global quantum internet is quantum teleportation of independent qubits over a free-space link whose attenuation corresponds to the path between a satellite and a ground station. Here we report such an experiment, using active feed-forward in real time. The experiment uses two free-space optical links, quantum and classical, over 143 kilometres between the two Canary Islands of La Palma and Tenerife. To achieve this, we combine advanced techniques involving a frequency-uncorrelated polarization-entangled photon pair source, ultra-low-noise single-photon detectors and entanglement-assisted clock synchronization. The average teleported state fidelity is well beyond the classical limit of two-thirds. Furthermore, we confirm the quality of the quantum teleportation procedure without feed-forward by complete quantum process tomography. Our experiment verifies the maturity and applicability of such technologies in real-world scenarios, in particular for future satellite-based quantum teleportation. PMID:22951967

  8. A multisyringe sequential injection method for monitoring water in the energy cogeneration system of a municipal waste incinerator.

    PubMed

    de Mirabó, F M Bauzá; Forteza, R; Cerdà, V

    2009-09-15

    Leading-edge urban solid waste ashing plants use burning heat energy to obtain electrical power. Water fed to their boilers for conversion into steam should be highly pure in order to minimize corrosion, scaling and similar phenomena, which can lead to malfunctioning and a reduced useful life but can be avoided by proper management and control of the water supply. In this work, we developed a multiparameter monitor based on multisyringe sequential injection for the sequential determination of up to eight important parameters, namely: pH, specific and acid conductivity, hydrazine, ammonium, phosphate, silicate and total iron. Acid conductivity was determined by passing the sample through a cation-exchange resin in order to retain ammonium ion and release protons. This parameter was deemed the most accurate indicator of dissolved solids in boiler water. Chemical parameters were determined spectrophotometrically: hydrazine by reaction with p-dimethylaminobenzaldehyde, ammonium by the modified Berthelot reaction, iron with o-phenanthroline, and phosphate and silica by formation of a molybdoheteropoly blue dye in the presence of ascorbic acid as reductant. Use of the optimum chemical and physical operating conditions provided 3s(blank) detection limits of 0.01 mg l(-1) N(2)H(4), 0.13 mg l(-1) NH(4)(+), 0.04 mg l(-1) Fe, 0.03 mg l(-1) SiO2 and 0.05 mg l(-1) PO(4)(3-), and relative standard deviations not greater than 2.5%. The methods integrated in the proposed monitor were successfully applied to real samples from the water-steam cycle at the Son Reus ashing plant in Palma de Mallorca (Spain). PMID:19615501

  9. Spatial vent opening probability map of El Hierro Island (Canary Islands, Spain)

    NASA Astrophysics Data System (ADS)

    Becerril, Laura; Cappello, Annalisa; Galindo, Inés; Neri, Marco; Del Negro, Ciro

    2013-04-01

    The assessment of the probable spatial distribution of new eruptions is useful to manage and reduce the volcanic risk. It can be achieved in different ways, but it becomes especially hard when dealing with volcanic areas less studied, poorly monitored and characterized by a low frequent activity, as El Hierro. Even though it is the youngest of the Canary Islands, before the 2011 eruption in the "Las Calmas Sea", El Hierro had been the least studied volcanic Island of the Canaries, with more historically devoted attention to La Palma, Tenerife and Lanzarote. We propose a probabilistic method to build the susceptibility map of El Hierro, i.e. the spatial distribution of vent opening for future eruptions, based on the mathematical analysis of the volcano-structural data collected mostly on the Island and, secondly, on the submerged part of the volcano, up to a distance of ~10-20 km from the coast. The volcano-structural data were collected through new fieldwork measurements, bathymetric information, and analysis of geological maps, orthophotos and aerial photographs. They have been divided in different datasets and converted into separate and weighted probability density functions, which were then included in a non-homogeneous Poisson process to produce the volcanic susceptibility map. Future eruptive events on El Hierro is mainly concentrated on the rifts zones, extending also beyond the shoreline. The major probabilities to host new eruptions are located on the distal parts of the South and West rifts, with the highest probability reached in the south-western area of the West rift. High probabilities are also observed in the Northeast and South rifts, and the submarine parts of the rifts. This map represents the first effort to deal with the volcanic hazard at El Hierro and can be a support tool for decision makers in land planning, emergency plans and civil defence actions.

  10. Transiting exoplanets from the CoRoT space mission⋆. XXVIII. CoRoT-33b, an object in the brown dwarf desert with 2:3 commensurability with its host star

    NASA Astrophysics Data System (ADS)

    Csizmadia, Sz.; Hatzes, A.; Gandolfi, D.; Deleuil, M.; Bouchy, F.; Fridlund, M.; Szabados, L.; Parviainen, H.; Cabrera, J.; Aigrain, S.; Alonso, R.; Almenara, J.-M.; Baglin, A.; Bordé, P.; Bonomo, A. S.; Deeg, H. J.; Díaz, R. F.; Erikson, A.; Ferraz-Mello, S.; Tadeu dos Santos, M.; Guenther, E. W.; Guillot, T.; Grziwa, S.; Hébrard, G.; Klagyivik, P.; Ollivier, M.; Pätzold, M.; Rauer, H.; Rouan, D.; Santerne, A.; Schneider, J.; Mazeh, T.; Wuchterl, G.; Carpano, S.; Ofir, A.

    2015-12-01

    We report the detection of a rare transiting brown dwarf with a mass of 59 MJup and radius of 1.1 RJup around the metal-rich, [Fe/H] = +0.44, G9V star CoRoT-33. The orbit is eccentric (e = 0.07) with a period of 5.82 d. The companion, CoRoT-33b, is thus a new member in the so-called brown dwarf desert. The orbital period is within 3% to a 3:2 resonance with the rotational period of the star. CoRoT-33b may be an important test case for tidal evolution studies. The true frequency of brown dwarfs close to their host stars (P< 10 d) is estimated to be approximately 0.2% which is about six times smaller than the frequency of hot Jupiters in the same period range. We suspect that the frequency of brown dwarfs declines faster with decreasing period than that of giant planets. The CoRoT space mission, launched on December 27th 2006, has been developed and is operated by CNES, with the contribution of Austria, Belgium, Brazil, ESA (RSSD and Science Programme), Germany and Spain. Based on observations made with HARPS (High Accuracy Radial velocity Planet Searcher) spectrograph on the 3.6-m European Organisation for Astronomical Research in the Southern Hemisphere telescope at La Silla Observatory, Chile (ESO program 188.C-0779).Based on observations obtained with the Nordic Optical Telescope, operated on the island of La Palma jointly by Denmark, Finland, Iceland, Norway, and Sweden, in the Spanish Observatorio del Roque de los Muchachos of the Instituto de Astrofisica de Canarias, in time allocated by the Spanish Time Allocation Committee (CAT).

  11. NTP technical report on the toxicity studies of Castor Oil (CAS No. 8001-79-4) in F344/N Rats and B6C3F1 Mice (Dosed Feed Studies).

    PubMed

    Irwin, R

    1992-03-01

    Castor oil is a natural oil derived from the seeds of the castor bean, Ricinus communis. It is comprised largely of triglycerides with a high ricinolin content. Toxicity studies with castor oil were performed by incorporating the material at concentrations as high as 10% in diets given to F344/N rats and B6C3F1 mice of both sexes for 13 weeks. Genetic toxicity studies also were performed and were negative for mutation induction in Salmonella typhimurium, for induction of sister chromatid exchanges or chromosomal aberrations in Chinese hamster ovary cells, and for induction of micronuclei in the peripheral blood erythrocytes of mice evaluated at the end of the 13-week studies. Exposure to castor oil at dietary concentrations as high as 10% in 13-week studies did not affect survival or body weight gains of rats or mice (10 per sex and dose). There were no biologically significant effects noted in hematologic analyses in rats. Mild increases in total bile acids and in serum alkaline phosphatase were noted at various times during the studies in rats receiving the higher dietary concentrations of castor oil. Liver weights were increased in male rats receiving the 10% dietary concentration and in male and female mice receiving diets containing 5% or 10% castor oil. However, there were no histopathologic lesions associated with these liver changes, nor were there any compound-related morphologic changes in any organ in rats or mice. No significant changes were noted in a screening for male reproductive endpoints, including sperm count and motility, and no changes were observed in the length of estrous cycles of rats or mice given diets containing castor oil. Thus, no significant adverse effects of castor oil administration were noted in these studies. Synonyms: Ricinus Oil, oil of Palma Christi, tangantangan oil, phorboyl, Neoloid.

  12. HPLC-APCI-MS analysis of triacylglycerols (TAGs) in historical pharmaceutical ointments from the eighteenth century.

    PubMed

    Saliu, Francesco; Modugno, Francesca; Orlandi, Marco; Colombini, Maria Perla

    2011-10-01

    The lipid fractions of residues from historical pharmaceutical ointments were analysed by reversed-phase liquid chromatography coupled with atmospheric pressure chemical ionization and mass spectrometer detection. The residues were contained in a series of historical apothecary jars, dating from the eighteenth century and conserved at the "Aboca Museum" in Sansepolcro (Arezzo, Italy) and at the pharmacy of the "Real Cartuja de Valldemossa" in Palma de Majorca (Spain). The analytical protocol was set up using a comparative study based on the evaluation of triacylglycerol (TAG) compositions in raw natural lipid materials and in laboratory-reproduced ointments. These ointments were prepared following pharmaceutical recipes reported in historical treatises and used as reference materials. The reference materials were also subjected to stress treatments in order to evaluate the modification occurring in the TAG profiles as an effect of ageing. TAGs were successfully detected in the reproduced formulations even in mixtures of up to ten ingredients and after harsh degradative treatments, and also in real historical samples. No particular interferences were detected from other non-lipid ingredients of the formulations. The TAG compositions detected in the historical ointments indicated a predominant use of olive oil and pig adipose material as lipid ingredients. The detection of a high level of tristearine and myristyl-palmitoyl-stearyl glycerol in two of the samples suggested the presence of a fatty material of a different origin (maybe a ruminant). On the basis of the positional isomer ratio, sn-PPO/sn-POP, it was possible to hypothesize an exclusive use of pig fat in one sample. We also evaluated the application of principal component analysis of TAG profiles as an approach for the multivariate statistical comparison of the reference and historical ointments.

  13. Fourteen short tandem repeat loci Y chromosome haplotypes: Genetic analysis in populations from northern Brazil.

    PubMed

    Palha, Teresinha; Ribeiro-Rodrigues, Elzemar; Ribeiro-dos-Santos, Andrea; Santos, Sidney

    2012-05-01

    Fourteen Y-STR loci (DYS458, DYS439, Y-GATA H4, DYS576, DYS447, DYS460, DYS456, YGATA A10, DYS437, DYS449, DYS570, DYS635 or Y-GATA C4, DYS448 and DYS438) were analysed in 873 males from eight northern Brazil populations: Belém (N=400), Santarém (N=69), Manaus (N=75), Macapá (N=65), Palmas (N=30), Rio Branco (N=32), Porto Velho (N=135) and Boa Vista (N=67). A total of 871 different haplotypes were identified, of which 869 were unique. The panel's estimated total haplotype diversity (HD) is 0.9988, and its discrimination capacity (DC) is 0.9980. The lowest estimates of genetic diversity correspond to markers Y-GATA H4 (0.550) and DYS460 (0.581), and the greatest (above 0.700) to markers DYS458, DYS576, DYS447, YS449, DYS570 and DYS635. The genetic parameters obtained were higher for the 14-Y-STR panel than that for the minimum haplotype set (HD=0.9969; DC=0.76) and the parameters were similar to those obtained with the panel of 17 YSTR of YHRD (HD=0.9987; DC=0. 9870). The analysis of molecular variance (AMOVA) indicated that most of the genetic variance is found within populations and a smaller, but significant part, is found among populations (R(ST)=0.027, p value=0.009). The data when compared with those from African, Amerindian and European populations have shown no significant genetic distance between northern Brazil populations and Europeans, but there is a significant genetic distance when compared to Africans and Amerindians. The discrimination capacity of the markers shows a high potential for forensic analysis.

  14. A Comparison of the Galaxy Populations in the Coma and Distant Clusters: The Evolution of k+a Galaxies and the Role of the Intracluster Medium

    NASA Astrophysics Data System (ADS)

    Poggianti, Bianca M.; Bridges, Terry J.; Komiyama, Y.; Yagi, M.; Carter, Dave; Mobasher, Bahram; Okamura, S.; Kashikawa, N.

    2004-01-01

    The spectroscopic properties of galaxies in the Coma Cluster are compared with those of galaxies in rich clusters at z~0.5, to investigate the evolution of the star formation history in clusters. Luminous galaxies with MV<=-20 and poststarburst/post-star-forming (k+a) spectra that constitute a significant fraction of galaxies in distant cluster samples are absent in Coma, where spectacular cases of k+a spectra are found instead at MV>-18.5 and represent a significant proportion of the cluster dwarf galaxy population. A simple inspection of their positions on the sky indicates that this type of galaxy does not show a preferential location within the cluster, but the bluest and strongest lined group of k+a galaxies lie in projection toward the central 1.4 Mpc of Coma and have radial velocities significantly higher than the cluster mean. We find a striking correlation between the positions of these young and strong poststarburst galaxies and substructure in the hot intracluster medium (ICM) identified from XMM-Newton data, with these galaxies lying close to the edges of two infalling substructures. This result strongly suggests that the interaction with the dense ICM could be responsible for the quenching of the star formation (thus creating the k+a spectrum) and, possibly, for any previous starburst. The evolution with redshift of the luminosity distribution of k+a galaxies can be explained by a ``downsizing effect,'' with the maximum luminosity/mass of actively star-forming galaxies infalling onto clusters decreasing at lower redshift. We discuss the possible physical origin of this downsizing effect and the implications of our results for current scenarios of environmental effects on the star formation in galaxies. Based on observations made with the William Herschel Telescope operated on the island of La Palma by the Isaac Newton Group in the Spanish Observatorio del Roque de los Muchachos of the Instituto de Astrofisica de Canarias.

  15. The Star Formation History of the Local Group Dwarf Elliptical Galaxy NGC 185. I. Stellar Content

    NASA Astrophysics Data System (ADS)

    Martínez-Delgado, D.; Aparicio, A.

    1998-04-01

    We present VI CCD photometry of ~16,000 stars in a 7.2‧ x 7.2‧ field of the Local Group dwarf elliptical galaxy NGC 185. The resulting VI color-magnitude diagram reveals a dominant red giant branch population, an important number of luminous red stars located above the tip of the red giant branch, and a number of blue and yellow stars. Besides the nucleus, our field also covers a large, less crowded area of the galaxy. We show color-magnitude diagrams at six different distances from the nucleus. The red giant branch becomes substantially narrower at larger distances from the nucleus, while the photometry gets deeper. In this paper, we concentrate on investigating the contribution of the observational effects (mainly crowding) to this observed gradient. Although we cannot rule out here the possibility that this trend partially originates in a gradient of the characteristics of the stellar populations of the galaxy with radius, we show that a strong radial gradient exists in the observational effects that can mimic a gradient in the real properties (e.g., age, metallicity) of the stellar population. A distance modulus of m - M = 23.95 +/- 0.10 has been obtained from the tip of the red giant branch, in good agreement with previous estimates. The average stellar metallicity is estimated to be [Fe/H] = -1.43 +/- 0.15, and decreases for increasing galactocentric distance. Based on observations made with the William Herschel Telescope operated on the island of La Palma by the Isaac Newton Group in the Spanish Observatorio del Roque de los Muchachos of the Instituto de Astrofísica de Canarias.

  16. Identification of Luminous Infrared Galaxies at 1 <~ z <~ 2.51,2,3,4,

    NASA Astrophysics Data System (ADS)

    Le Floc'h, E.; Pérez-González, P. G.; Rieke, G. H.; Papovich, C.; Huang, J.-S.; Barmby, P.; Dole, H.; Egami, E.; Alonso-Herrero, A.; Wilson, G.; Miyazaki, S.; Rigby, J. R.; Bei, L.; Blaylock, M.; Engelbracht, C. W.; Fazio, G. G.; Frayer, D. T.; Gordon, K. D.; Hines, D. C.; Misselt, K. A.; Morrison, J. E.; Muzerolle, J.; Rieke, M. J.; Rigopoulou, D.; Su, K. Y. L.; Willner, S. P.; Young, E. T.

    2004-09-01

    We present preliminary results on 24 μm detections of luminous infrared galaxies at z>~1 with the Multiband Imaging Photometer for Spitzer (MIPS). Observations were performed in the Lockman Hole and the Extended Groth Strip (EGS) and were supplemented by data obtained with the Infrared Array Camera (IRAC) between 3 and 9 μm. The positional accuracy of <~2" for most MIPS/IRAC detections provides unambiguous identifications of their optical counterparts. Using spectroscopic redshifts from the Deep Extragalactic Evolutionary Probe survey, we identify 24 μm sources at z>~1 in the EGS, while the combination of the MIPS/IRAC observations with BVRIJHK ancillary data in the Lockman Hole also shows very clear cases of galaxies with photometric redshifts at 1<~z<~2.5. The observed 24 μm fluxes indicate infrared luminosities greater than 1011 Lsolar, while the data at shorter wavelengths reveal rather red and probably massive (M>~M*) galaxy counterparts. It is the first time that this population of luminous objects is detected up to z~2.5 in the infrared. Our work demonstrates the ability of the MIPS instrument to probe the dusty universe at very high redshift and illustrates how the forthcoming Spitzer deep surveys will offer a unique opportunity to illuminate a dark side of cosmic history not explored by previous infrared experiments. Based on observations collected at the German-Spanish Astronomical Center, Calar Alto, operated jointly by Max-Planck-Institut für Astronomie and Instituto de Astrofísica de Andalucia (CSIC). Based on observations made with the Isaac Newton Telescope, operated on the island of La Palma by the Isaac Newton Group in the Spanish Observatorio del Roque de los Muchachos of the Instituto de Astrofísica de Canarias.

  17. New Martian Trojans and an update on the Eureka cluster

    NASA Astrophysics Data System (ADS)

    Christou, A. A.; Vaduvescu, O.; Tudor, V.; Asher, D. J.; Toma, R.; Knapen, J.; Ponomareva, A. A.

    2014-04-01

    The number of known Trojan asteroids of Mars has recently increased twofold [1, 2]. This has led to claims of a cluster [2] associated with the first Mars Trojan discovered, 5261 Eureka. The existence of an asteroid family so close to the Sun has implications for our understanding of asteroid evolution in general. Depending on the formation mechanism, studying these objects will provide insight on their collisional history and their long-term physical & dynamical evolution under the Yarkovsky and YORP effects [3]. Martian Trojans are also a useful control population for the study of the resetting of asteroid surfaces by planetary close encounters [4]. The clustering claim is based on an overall sample of 6 Trojans. To confirm it, we are presently carrying out an observational programme to (a) recover singleopposition Martian Trojan candidates and increase the sample size, and (b) improve the orbits of known Trojans. At the time of abstract submission, we have con-firmed several additional asteroids as Martian Trojans, including a single-opposition object - 2011 SL25 - recovered early in 2014 using the 2.5m Isaac Newton Telescope (Isaac Newton Group, La Palma, Canary Islands; Fig. 1). We have also recovered 2011 UN63 using the 2m Faulkes Telescope South (Siding Spring, Australia), a confirmed cluster member that was nevertheless previously observed on only two apparitions. During the conference, we will present results for the additional objects, in particular whether they are cluster members or not. Using the improved statistics and orbits, we re-assess the different scenarios for the cluster's origin.

  18. The Local Group Census: planetary nebulae in the spheroidal galaxies NGC 147, NGC 185 and NGC 205

    NASA Astrophysics Data System (ADS)

    Corradi, R. L. M.; Magrini, L.; Greimel, R.; Irwin, M.; Leisy, P.; Lennon, D. J.; Mampaso, A.; Perinotto, M.; Pollacco, D. L.; Walsh, J. R.; Walton, N. A.; Zijlstra, A. A.

    2005-02-01

    In the framework of our narrow-band survey of Local Group galaxies, we present the results of the search for planetary nebulae (PNe) in three spheroidal companions to the Andromeda galaxy. We find 9 candidate PNe in NGC 147, 5 in NGC 185, and 75 in the ˜0.4 square degree area searched around NGC 205, increasing the number of PNe known in these galaxies. It is shown that in the crowded regions of these galaxies continuum-subtracted images are more effective in detecting PNe than colour-colour diagrams obtained via automatic photometry. For NGC 205, the degree of contamination of PNe belonging to the halo of M 31 is estimated; taking it into account, 35 PNe within 1.5 tidal radii from the centre of NGC 205 have been used to build its PN luminosity function. Candidate PNe in NGC 185 are systematically brighter than those in NGC 147. Considering that star formation is thought to have been much stronger in NGC 185 than in NGC 147 in the last 3 Gyr, this might suggest that the bright end of the PN luminosity function is populated by relatively massive stars, as predicted by some recent theoretical models. This result, however, has to be taken with some caution, given the small PN population size of these galaxies and a rather incomplete knowledge of their star formation history. Based on observations obtained at the 2.5m INT telescope operated on the island of La Palma by the Isaac Newton Group in the Spanish Observatorio del Roque de Los Muchachos of the Instituto de Astrofísica de Canarias.

  19. Beryllium abundances in parent stars of extrasolar planets: 16 Cygni A & B and rho (1) CANCRI

    NASA Astrophysics Data System (ADS)

    Garcia Lopez, R. J.; Perez de Taoro, M. R.

    1998-06-01

    The (9) Be ii lambda 3131 Angstroms doublet has been observed in the solar-type stars 16 Cyg A & B and in the late G-type star rho (1) Cnc, to derive their beryllium abundances. 16 Cyg A & B show similar (solar) beryllium abundances while 16 Cyg B, which has been proposed to have a planetary companion of ~ 2 M_Jup, is known to be depleted in lithium by a factor larger than 6 with respect to 16 Cyg A. Differences in their rotational histories which could induce different rates of internal mixing of material, and the ingestion of a similar planet by 16 Cyg A are discussed as potential explanations. The existence of two other solar-type stars which are candidates to harbour planetary-mass companions and which show lithium and beryllium abundances close to those of 16 Cyg A, requires a more detailed inspection of the peculiarities of the 16 Cyg system. For rho (1) Cnc, which is the coolest known object candidate to harbour a planetary-mass companion (M > 0.85 M_Jup), we establish a precise upper limit for its beryllium abundance, showing a strong Be depletion which constrains the available mixing mechanisms. Observations of similar stars without companions are required to assess the potential effects of the planetary companion on the observed depletion. It has been recently claimed that rho (1) Cnc appears to be a subgiant. If this were the case, the observed strong Li and Be depletions could be explained by a dilution process taking place during its post-main sequence evolution. Based on observations made with the Nordic Optical and William Herschel Telescopes, which are operated on the island of La Palma by the NOT Scientific Association and the Isaac Newton Group, respectively, in the Spanish Observatorio del Roque de los Muchachos of the Instituto de Astrof\\'\\i sica de Canarias.

  20. Intraocular straylight screening in medical testing centres for driver licence holders in Spain

    PubMed Central

    Michael, Ralph; Barraquer, Rafael I.; Rodríguez, Judith; Tuñi i Picado, Josep; Jubal, Joan Serra; González Luque, Juan Carlos; van den Berg, Tom

    2010-01-01

    Purpose To test the performance of the C-quant straylight meter during the daily routine work in medical testing centres for driver license applicants and driver license holders in Spain. Methods Altogether 914 subjects, of which 376 younger than 35 years, 428 between 35 and 60 years and 110 over 60 years were measured with the C-quant in three medical testing centres (Barcelona, Zaragoza and Palma de Mallorca) in 2006. Technicians were instructed once and the measurements were done during the daily routine work. We recorded: age, BCVA, self-reported subjective blinding at night; and from the C-quant: straylight parameter (log s), measurement quality parameters (ESD, Q) and test duration. Results Total C-quant test duration increases slightly with age from a mean of 7 min (< 35 years) to a mean of 9 min (> 60). At first attempt, 82 % of all subjects produced reliable results (ESD < 0.12). The straylight parameter for this group was independent of ESD and ESD was independent of total test duration. The known age dependence of the straylight parameter and the weak correlation with BCVA was confirmed. The distribution of subjective blinding at night was very different between test centres. Subjects with “very strong” subjective blinding had significantly higher straylight values than subjects with “no” subjective blinding. Subjects avoiding night driving had significant higher straylight values than subjects driving at night. Conclusion The C-quant measure is reasonable fast. Good subject instruction is important to get first attempt reliable results. Self-reported subjective blinding results depend strongly on the interviewer.

  1. Disentangling the complex evolutionary history of the Western Palearctic blue tits (Cyanistes spp.) - phylogenomic analyses suggest radiation by multiple colonization events and subsequent isolation.

    PubMed

    Stervander, Martin; Illera, Juan Carlos; Kvist, Laura; Barbosa, Pedro; Keehnen, Naomi P; Pruisscher, Peter; Bensch, Staffan; Hansson, Bengt

    2015-05-01

    Isolated islands and their often unique biota continue to play key roles for understanding the importance of drift, genetic variation and adaptation in the process of population differentiation and speciation. One island system that has inspired and intrigued evolutionary biologists is the blue tit complex (Cyanistes spp.) in Europe and Africa, in particular the complex evolutionary history of the multiple genetically distinct taxa of the Canary Islands. Understanding Afrocanarian colonization events is of particular importance because of recent unconventional suggestions that these island populations acted as source of the widespread population in mainland Africa. We investigated the relationship between mainland and island blue tits using a combination of Sanger sequencing at a population level (20 loci; 12 500 nucleotides) and next-generation sequencing of single population representatives (>3 200 000 nucleotides), analysed in coalescence and phylogenetic frameworks. We found (i) that Afrocanarian blue tits are monophyletic and represent four major clades, (ii) that the blue tit complex has a continental origin and that the Canary Islands were colonized three times, (iii) that all island populations have low genetic variation, indicating low long-term effective population sizes and (iv) that populations on La Palma and in Libya represent relicts of an ancestral North African population. Further, demographic reconstructions revealed (v) that the Canary Islands, conforming to traditional views, hold sink populations, which have not served as source for back colonization of the African mainland. Our study demonstrates the importance of complete taxon sampling and an extensive multimarker study design to obtain robust phylogeographical inferences. PMID:25753616

  2. The color dependent morphology of the post-AGB star HD 161796

    NASA Astrophysics Data System (ADS)

    Min, M.; Jeffers, S. V.; Canovas, H.; Rodenhuis, M.; Keller, C. U.; Waters, L. B. F. M.

    2013-06-01

    Context. Many protoplanetary nebulae show strong asymmetries in their surrounding shells, pointing to asymmetries during the mass loss phase. Questions concerning the origin and the onset of deviations from spherical symmetry are important for our understanding of the evolution of these objects. Here we focus on the circumstellar shell of the post-AGB star HD 161796. Aims: We aim to detect signatures of an aspherical outflow, and to derive its properties. Methods: We used the imaging polarimeter the Extreme Polarimeter (ExPo), a visitor instrument at the William Herschel Telescope, to accurately image the dust shell surrounding HD 161796 in various wavelength filters. Imaging polarimetry allows us to separate the faint, polarized, light that comes from circumstellar material from the bright, unpolarized, light from the central star. Results: The shell around HD 161796 is highly aspherical. A clear signature of an equatorial density enhancement can be seen. This structure is optically thick at short wavelengths and changes its appearance to optically thin at longer wavelengths. In the classification of the two different appearances of planetary nebulae from HST images it changes from being classified as DUst-Prominent Longitudinally-EXtended (DUPLEX) at short wavelengths to star-obvious low-level-elongated (SOLE) at longer wavelengths. This strengthens the interpretation that these two appearances are manifestations of the same physical structure. Furthermore, we find that the central star is hotter than often assumed and the relatively high observed reddening is a consequence of circumstellar rather than interstellar extinction. Based on observations made with the William Herschel Telescope operated on the island of La Palma by the Isaac Newton Group in the Spanish Observatorio del Roque de los Muchachos of the Instituto de Astrofsicaŋsica de Canarias.

  3. Abell 41: shaping of a planetary nebula by a binary central star

    NASA Astrophysics Data System (ADS)

    Jones, D.; Lloyd, M.; Santander-García, M.; López, J. A.; Meaburn, J.; Mitchell, D. L.; O'Brien, T. J.; Pollacco, D.; Rubio-Díez, M. M.; Vaytet, N. M. H.

    2010-11-01

    We present the first detailed spatiokinematical analysis and modelling of the planetary nebula Abell 41, which is known to contain the well-studied close-binary system MT Ser. This object represents an important test case in the study of the evolution of planetary nebulae with binary central stars as current evolutionary theories predict that the binary plane should be aligned perpendicular to the symmetry axis of the nebula. Deep narrow-band imaging in the light of [NII]6584Å, [OIII]5007 Å and [SII]6717+6731Å, obtained using ACAM on the William Herschel Telescope, has been used to investigate the ionization structure of Abell 41. Long-slit observations of the Hα and [NII]6584Å emission were obtained using the Manchester Echelle Spectrometer on the 2.1-m San Pedro Mártir Telescope. These spectra, combined with the narrow-band imagery, were used to develop a spatiokinematical model of [NII]6584Å emission from Abell 41. The best-fitting model reveals Abell 41 to have a waisted, bipolar structure with an expansion velocity of ~40 km s-1 at the waist. The symmetry axis of the model nebula is within 5° of perpendicular to the orbital plane of the central binary system. This provides strong evidence that the close-binary system, MT Ser, has directly affected the shaping of its nebula, Abell 41. Although the theoretical link between bipolar planetary nebulae and binary central stars is long established, this nebula is only the second to have this link, between nebular symmetry axis and binary plane, proved observationally. Based on observations made with the William Herschel Telescope operated on the island of La Palma by the Isaac Newton Group in the Spanish Observatorio del Roque de los Muchachos of the Instituto de Astrofísica de Canarias. E-mail: david.jones-3@postgrad.manchester.ac.uk

  4. Spectro-astrometry of V1515 Cygni

    NASA Astrophysics Data System (ADS)

    Agra-Amboage, V.; Garcia, P. J. V.

    2014-05-01

    Context. FU Orionis objects are a class of young stars with powerful bursts in luminosity that show evidence of accretion and ejection activity. It is generally accepted that they are surrounded by a Keplerian circumstellar disk and an infalling envelope. The outburst occurs because of a sudden increase in the accretion rate. Aims: We study the regions closer to the central star in order to observe the signs of the accretion and ejection activity. Methods: We present optical observations of the Hα line using the Integral Field Spectrograph OASIS, at the William Herschel Telescope, combined with adaptive optics. Since this technique gives the spectral information for both spatial directions, we carried out a two-dimensional spectro-astrometric study of the signal. Results: We measured a clear spectro-astrometric signal in the north-south direction. The cross-correlation between the spectra showed a spatial distribution in velocity suggestive of scattering by a disk surrounding the star. This would be one of the few spatial inferences of a disk observed in an FU Orionis object. However, to fully understand the observed structure, higher angular and spectral resolution observations are required. V1515 Cyg now appears to be an important object to be observed with a new generation of instruments to increase our knowledge about the disk and outflow structure in FU Orionis objects. Based on service observations made with the WHT operated on the island of La Palma by the Isaac Newton Group in the Spanish Observatorio del Roque de los Muchachos of the Instituto de Astrofísica de Canarias.All the figures are available in color in electronic form.

  5. Near-infrared spectroscopy in NGC 7538

    NASA Astrophysics Data System (ADS)

    Puga, E.; Marín-Franch, A.; Najarro, F.; Lenorzer, A.; Herrero, A.; Acosta Pulido, J. A.; Chavarría, L. A.; Bik, A.; Figer, D.; Ramírez Alegría, S.

    2010-07-01

    Aims: The characterisation of the stellar population in young high-mass star-forming regions allows fundamental cluster properties like distance and age to be constrained. These are essential when using high-mass clusters as probes for conducting Galactic studies. Methods: NGC 7538 is a star-forming region with an embedded stellar population unearthed only in the near-infrared (NIR). We present the first near-infrared spectro-photometric study of the candidate high-mass stellar content in NGC 7538. We obtained H and K spectra of 21 sources with both the multi-object and long-slit modes of LIRIS at the WHT, and complement these data with subarcsecond JHKs photometry of the region using the imaging mode of the same instrument. Results: We find a wide variety of objects within the studied stellar population of NGC 7538. Our results discriminate between a stellar population associated to the H ii region, but not contained within its extent, and several pockets of more recent star formation. We report the detection of CO bandhead emission toward several sources, as well as other features indicative of a young stellar nature. We infer a spectro-photometric distance of 2.7 ± 0.5 kpc, an age spread in the range 0.5-2.2 Myr and a total mass 1.7 × 103 Msun for the older population. Based on observations made with the WHT operated on the island of La Palma by the Isaac Newton Group in the Spanish Observatorio del Roque de los Muchachos of the Instituto de Astrofísica de Canarias.

  6. Direct imaging of a massive dust cloud around R Coronae Borealis

    NASA Astrophysics Data System (ADS)

    Jeffers, S. V.; Min, M.; Waters, L. B. F. M.; Canovas, H.; Rodenhuis, M.; de Juan Ovelar, M.; Chies-Santos, A. L.; Keller, C. U.

    2012-03-01

    We present recent polarimetric images of the highly variable star R CrB using ExPo and archival WFPC2 images from the HST. We observed R CrB during its current dramatic minimum where it decreased more than 9 mag due to the formation of an obscuring dust cloud. Since the dust cloud is only in the line-of-sight, it mimics a coronograph allowing the imaging of the star's circumstellar environment. Our polarimetric observations surprisingly show another scattering dust cloud at approximately 1.3'' or 2000 AU from the star. We find that to obtain a decrease in the stellar light of 9 mag and with 30% of the light being reemitted at infrared wavelengths (from R CrB's SED) the grains in R CrB's circumstellar environment must have a very low albedo of approximately 0.07%. We show that the properties of the dust clouds formed around R CrB are best fitted using a combination of two distinct populations of grains size. The first are the extremely small 5 nm grains, formed in the low density continuous wind, and the second population of large grains (~0.14 μm) which are found in the ejected dust clouds. The observed scattering cloud, not only contains such large grains, but is exceptionally massive compared to the average cloud. Based on observations made with the William Herschel Telescope operated on the island of La Palma by the Isaac Newton Group in the Spanish Observatorio del Roque de los Muchachos of the Instituto de Astrofisica de Canarias.

  7. Constraining the circumbinary envelope of Z Canis Majoris via imaging polarimetry

    NASA Astrophysics Data System (ADS)

    Canovas, H.; Min, M.; Jeffers, S. V.; Rodenhuis, M.; Keller, C. U.

    2012-07-01

    Context. Z CMa is a complex binary system composed of a Herbig Be and an FU Ori star. The Herbig star is surrounded by a dust cocoon of variable geometry, and the whole system is surrounded by an infalling envelope. Previous spectropolarimetric observations have reported a preferred orientation of the polarization angle, perpendicular to the direction of a very extended, parsec-sized jet associated with the Herbig star. Aims: The variability in the amount of polarized light has been associated to changes in the geometry of the dust cocoon that surrounds the Herbig star. We aim to constrain the properties of Z CMa by means of imaging polarimetry at optical wavelengths. Methods: Using ExPo, a dual-beam imaging polarimeter that operates at optical wavelengths, we have obtained imaging (linear) polarimetric data of Z CMa. Our observations were secured during the return to quiescence after the 2008 outburst. Results: We detect three polarized features over Z CMa. Two of these features are related to the two jets reported in this system: the large jet associated to the Herbig star, and the micro-jet associated to the FU Ori star. Our results suggest that the micro-jet extends to a distance ten times longer than reported in previous studies. The third feature suggests the presence of a hole in the dust cocoon that surrounds the Herbig star of this system. According to our simulations, this hole can produce a pencil beam of light that we see scattered off the low-density envelope surrounding the system. Based on observations made with the William Herschel Telescope operated on the island of La Palma by the Isaac Newton Group in the Spanish Observatorio del Roque de los Muchachos of the Instituto de Astrofísica de Canarias.

  8. The kinematics of the quadrupolar nebula M 1-75 and the identification of its central star

    NASA Astrophysics Data System (ADS)

    Santander-García, M.; Rodríguez-Gil, P.; Hernandez, O.; Corradi, R. L. M.; Jones, D.; Giammanco, C.; Beckman, J. E.; Carignan, C.; Fathi, K.; Rubio-Díez, M. M.; Jiménez-Luján, F.; Benn, C. R.

    2010-09-01

    Context. The link between how bipolar planetary nebulae are shaped and their central stars is still poorly understood. Aims: This paper investigates the kinematics and shaping of the multipolar nebula M 1-75, and briefly discusses the location and nature of its central star. Methods: Fabry-Perot data from GHαFAS on the WHT that samples the Doppler shift of the [Nii] 658.3 nm line are used to study the dynamics of the nebula by means of a detailed 3D spatio-kinematical model. Multi-wavelength images and spectra from the WFC and IDS on the INT, as well as from ACAM on the WHT, allowed us to constrain the parameters of the central star. Results: The two pairs of lobes, angularly separated by ~22°, were ejected simultaneously approx. ~3500-5000 years ago, at the adopted distance range from 3.5 to 5.0 kpc. The larger lobes show a slight degree of point symmetry. The formation of the nebula could be explained by wind interaction in a system consisting of a post-AGB star surrounded by a disc warped by radiative instabilities. This requires the system to be a close binary or a single star that engulfed a planet as it died. On the other hand, we present broad- and narrow-band images and a low S/N optical spectrum of the highly-reddened, previously unnoticed star that is likely the nebular progenitor. Its estimated V-I colour allows us to derive a rough estimate of the parameters and nature of the central star. Based on observations made with the 4.2 m William Herschel Telescope and the 2.5 m Isaac Newton Telescope, both operated on the island of la Palma by the Isaac Newton Group of Telescopes in the Spanish Observatorio del Roque de los Muchachos of the Instituto de Astrofísica de Canarias.

  9. Complex Gas Kinematics in Compact, Rapidly Assembling Star-forming Galaxies

    NASA Astrophysics Data System (ADS)

    Amorín, R.; Vílchez, J. M.; Hägele, G. F.; Firpo, V.; Pérez-Montero, E.; Papaderos, P.

    2012-08-01

    Deep, high-resolution spectroscopic observations have been obtained for six compact, strongly star-forming galaxies at redshift z ~ 0.1-0.3, most of them also known as green peas. Remarkably, these galaxies show complex emission-line profiles in the spectral region including Hα, [N II] λλ6548, 6584, and [S II] λλ6717, 6731, consisting of the superposition of different kinematical components on a spatial extent of few kiloparsecs: a very broad line emission underlying more than one narrower component. For at least two of the observed galaxies some of these multiple components are resolved spatially in their two-dimensional spectra, whereas for another one a faint detached Hα blob lacking stellar continuum is detected at the same recessional velocity ~7 kpc away from the galaxy. The individual narrower Hα components show high intrinsic velocity dispersion (σ ~ 30-80 km s-1), suggesting together with unsharped masking Hubble Space Telescope images that star formation proceeds in an ensemble of several compact and turbulent clumps, with relative velocities of up to ~500 km s-1. The broad underlying Hα components indicate in all cases large expansion velocities (full width zero intensity >=1000 km s-1) and very high luminosities (up to ~1042 erg s-1), probably showing the imprint of energetic outflows from supernovae. These intriguing results underline the importance of green peas for studying the assembly of low-mass galaxies near and far. Based on observations made with the William Herschel Telescope operated on the island of La Palma by the Isaac Newton Group in the Spanish Observatorio del Roque de los Muchachos of the Instituto de Astrofísica de Canarias.

  10. Another deep dimming of the classical T Tauri star RW Aurigae A

    NASA Astrophysics Data System (ADS)

    Petrov, P. P.; Gahm, G. F.; Djupvik, A. A.; Babina, E. V.; Artemenko, S. A.; Grankin, K. N.

    2015-05-01

    Context. RW Aur A is a classical T Tauri star (CTTS) with an unusually rich emission line spectrum. In 2014 the star faded by ~3 mag in the V band and went into a long-lasting minimum. In 2010 the star underwent a similar fading, although less pronounced. These events in RW Aur A are very unusual among the CTTS, and have been attributed to occultations by passing dust clouds. Aims: We want to find out if any spectral changes took place after the last fading of RW Aur A with the intention of gathering more information on the occulting body and the cause of the phenomenon. Methods: We collected spectra of the two components of RW Aur. The photometry was performed before and during the minimum. Results: The overall spectral signatures reflecting emission from accretion flows from disk to star did not change after the fading. However, blue-shifted absorption components related to the stellar wind increased in strength in certain resonance lines, and the profiles and strengths but not the fluxes of forbidden lines became drastically different. Conclusions: The extinction through the obscuring cloud is grey indicating the presence of large dust grains. At the same time, there are no traces of related absorbing gas. The cloud occults the star and the interior part of the stellar wind, but not the wind or jet further out. The dimming in 2014 was not accompanied by changes in the accretion flows at the stellar surface. There is evidence that the structure and velocity pattern of the stellar wind did change significantly. The dimmings could be related to passing condensations in a tidally disrupted disk, as proposed earlier, but we also speculate that large dust grains have been stirred up from the inclined disk into the line of sight through the interaction with an enhanced wind. Based on observations collected at the Nordic Optical Telescope, La Palma, Spain; Fast-Track Service program 50-409.

  11. Cyclic Explosivity in High Elevation Phreatomagmatic Eruptions at Ocean Island Volcanoes: Implications for Aquifer Pressurization and Volcano Flank Destabilization.

    NASA Astrophysics Data System (ADS)

    Tarff, R.; Day, S. J.; Downes, H.; Seghedi, I.

    2015-12-01

    Groundwater heating and pressurization of aquifers trapped between dikes in ocean island volcanoes has been proposed as a mechanism for destabilizing and triggering large-volume flank collapses. Previous modelling has indicated that heat transfer from sustained magma flow through dikes during eruption has the potential to produce destabilizing levels of pressure on time scales of 4 to 400 days, if the aquifers remain confined. Here we revisit this proposal from a different perspective. We examine evidence for pressure variations in dike-confined aquifers during eruptions at high elevation vents on ocean island volcanoes. Initially magmatic, these eruptions change to mostly small-volume explosive phreatomagmatic activity. A recent example is the 1949 eruption on La Palma, Canary Islands. Some such eruptions involve sequences of larger-volume explosive phases or cycles, including production of voluminous low-temperature, pyroclastic density currents (PDC). Here we present and interpret data from the Cova de Paul crater eruption (Santo Antao, Cape Verde Islands). The phreatomagmatic part of this eruption formed two cycles, each culminating with eruption of PDCs. Compositional and textural variations in the products of both cycles indicate that the diatreme fill began as coarse-grained and permeable which allowed gas to escape. During the eruption, the fill evolved to a finer grained, poorly sorted, less permeable material, in which pore fluid pressures built up to produce violent explosive phases. This implies that aquifers adjacent to the feeder intrusion were not simply depressurized at the onset of phreatomagmatic explosivity but experienced fluctuations in pressure throughout the eruption as the vent repeatedly choked and emptied. In combination with fluctuations in magma supply rate, driving of aquifer pressurization by cyclical vent choking will further complicate the prediction of flank destabilization during comparable eruptions on ocean island volcanoes.

  12. Asteroseismology of RXJ 2117+3412, the hottest pulsating PG 1159 star

    NASA Astrophysics Data System (ADS)

    Vauclair, G.; Moskalik, P.; Pfeiffer, B.; Chevreton, M.; Dolez, N.; Serre, B.; Kleinman, S. J.; Barstow, M.; Sansom, A. E.; Solheim, J.-E.; Belmonte, J. A.; Kawaler, S. D.; Kepler, S. O.; Kanaan, A.; Giovannini, O.; Winget, D. E.; Watson, T. K.; Nather, R. E.; Clemens, J. C.; Provencal, J.; Dixson, J. S.; Yanagida, K.; Nitta Kleinman, A.; Montgomery, M.; Klumpe, E. W.; Bruvold, A.; O'Brien, M. S.; Hansen, C. J.; Grauer, A. D.; Bradley, P. A.; Wood, M. A.; Achilleos, N.; Jiang, S. Y.; Fu, J. N.; Marar, T. M. K.; Ashoka, B. N.; Meĭstas, E. G.; Chernyshev, A. V.; Mazeh, T.; Leibowitz, E.; Hemar, S.; Krzesiński, J.; Pajdosz, G.; Zoła, S.

    2002-01-01

    The pulsating PG 1159 planetary nebula central star RXJ 2117+3412 has been observed over three successive seasons of a multisite photometric campaign. The asteroseismological analysis of the data, based on the 37 identified l=1 modes among the 48 independent pulsation frequencies detected in the power spectrum, leads to the derivation of the rotational splitting, the period spacing and the mode trapping cycle and amplitude, from which a number of fundamental parameters can be deduced. The average rotation period is 1.16±0.05 days. The trend for the rotational splitting to decrease with increasing periods is incompatible with a solid body rotation. The total mass is 0.56+0.02-0.04 Msolar and the He-rich envelope mass fraction is in the range 0.013-0.078 M*. The luminosity derived from asteroseismology is log(L/Lsolar)= 4.05 +0.23-0.32 and the distance 760 +230-235 pc. At such a distance, the linear size of the planetary nebulae is 2.9±0.9 pc. The role of mass loss on the excitation mechanism and its consequence on the amplitude variations is discussed. Based on data obtained in observing time allocated by the Bernard Lyot Telescope, INSU/CNRS, France, the TCS at Teide Observatory, Tenerife, Spain, the INT and JKT Telescopes at Roque de Los Muchachos Observatory, La Palma, Spain, the Laboratorio Nacional de Astrofisica/CNPq, Brazil, the McDonal Observatory, Texas, USA, the Steward Observatory, Arizona, USA, the Mauna Kea Observatory, University of Hawaii, USA, the Mount Stromlo and Siding Spring Observatory, Australia, the Beijing Observatory, China, the Vainu Bappu Observatory, India, the Maidanak Observatory, Uzbekistan, the Wise Observatory, Israel, and the Suhora Observatory, Poland.

  13. Towards a new Mercator Observatory Control System

    NASA Astrophysics Data System (ADS)

    Pessemier, W.; Raskin, G.; Prins, S.; Saey, P.; Merges, F.; Padilla, J. P.; Van Winckel, H.; Waelkens, C.

    2010-07-01

    A new control system is currently being developed for the 1.2-meter Mercator Telescope at the Roque de Los Muchachos Observatory (La Palma, Spain). Formerly based on transputers, the new Mercator Observatory Control System (MOCS) consists of a small network of Linux computers complemented by a central industrial controller and an industrial real-time data communication network. Python is chosen as the high-level language to develop flexible yet powerful supervisory control and data acquisition (SCADA) software for the Linux computers. Specialized applications such as detector control, auto-guiding and middleware management are also integrated in the same Python software package. The industrial controller, on the other hand, is connected to the majority of the field devices and is targeted to run various control loops, some of which are real-time critical. Independently of the Linux distributed control system (DCS), this controller makes sure that high priority tasks such as the telescope motion, mirror support and hydrostatic bearing control are carried out in a reliable and safe way. A comparison is made between different controller technologies including a LabVIEW embedded system, a PROFINET Programmable Logic Controller (PLC) and motion controller, and an EtherCAT embedded PC (soft-PLC). As the latter is chosen as the primary platform for the lower level control, a substantial part of the software is being ported to the IEC 61131-3 standard programming languages. Additionally, obsolete hardware is gradually being replaced by standard industrial alternatives with fast EtherCAT communication. The use of Python as a scripting language allows a smooth migration to the final MOCS: finished parts of the new control system can readily be commissioned to replace the corresponding transputer units of the old control system with minimal downtime. In this contribution, we give an overview of the systems design, implementation details and the current status of the project.

  14. Accurate paleointensities - the multi-method approach

    NASA Astrophysics Data System (ADS)

    de Groot, Lennart

    2016-04-01

    The accuracy of models describing rapid changes in the geomagnetic field over the past millennia critically depends on the availability of reliable paleointensity estimates. Over the past decade methods to derive paleointensities from lavas (the only recorder of the geomagnetic field that is available all over the globe and through geologic times) have seen significant improvements and various alternative techniques were proposed. The 'classical' Thellier-style approach was optimized and selection criteria were defined in the 'Standard Paleointensity Definitions' (Paterson et al, 2014). The Multispecimen approach was validated and the importance of additional tests and criteria to assess Multispecimen results must be emphasized. Recently, a non-heating, relative paleointensity technique was proposed -the pseudo-Thellier protocol- which shows great potential in both accuracy and efficiency, but currently lacks a solid theoretical underpinning. Here I present work using all three of the aforementioned paleointensity methods on suites of young lavas taken from the volcanic islands of Hawaii, La Palma, Gran Canaria, Tenerife, and Terceira. Many of the sampled cooling units are <100 years old, the actual field strength at the time of cooling is therefore reasonably well known. Rather intuitively, flows that produce coherent results from two or more different paleointensity methods yield the most accurate estimates of the paleofield. Furthermore, the results for some flows pass the selection criteria for one method, but fail in other techniques. Scrutinizing and combing all acceptable results yielded reliable paleointensity estimates for 60-70% of all sampled cooling units - an exceptionally high success rate. This 'multi-method paleointensity approach' therefore has high potential to provide the much-needed paleointensities to improve geomagnetic field models for the Holocene.

  15. SAR-based change detection using hypothesis testing and Markov random field modelling

    NASA Astrophysics Data System (ADS)

    Cao, W.; Martinis, S.

    2015-04-01

    The objective of this study is to automatically detect changed areas caused by natural disasters from bi-temporal co-registered and calibrated TerraSAR-X data. The technique in this paper consists of two steps: Firstly, an automatic coarse detection step is applied based on a statistical hypothesis test for initializing the classification. The original analytical formula as proposed in the constant false alarm rate (CFAR) edge detector is reviewed and rewritten in a compact form of the incomplete beta function, which is a builtin routine in commercial scientific software such as MATLAB and IDL. Secondly, a post-classification step is introduced to optimize the noisy classification result in the previous step. Generally, an optimization problem can be formulated as a Markov random field (MRF) on which the quality of a classification is measured by an energy function. The optimal classification based on the MRF is related to the lowest energy value. Previous studies provide methods for the optimization problem using MRFs, such as the iterated conditional modes (ICM) algorithm. Recently, a novel algorithm was presented based on graph-cut theory. This method transforms a MRF to an equivalent graph and solves the optimization problem by a max-flow/min-cut algorithm on the graph. In this study this graph-cut algorithm is applied iteratively to improve the coarse classification. At each iteration the parameters of the energy function for the current classification are set by the logarithmic probability density function (PDF). The relevant parameters are estimated by the method of logarithmic cumulants (MoLC). Experiments are performed using two flood events in Germany and Australia in 2011 and a forest fire on La Palma in 2009 using pre- and post-event TerraSAR-X data. The results show convincing coarse classifications and considerable improvement by the graph-cut post-classification step.

  16. COSMOGRAIL: the COSmological MOnitoring of GRAvItational Lenses. XIII. Time delays and 9-yr optical monitoring of the lensed quasar RX J1131-1231

    NASA Astrophysics Data System (ADS)

    Tewes, M.; Courbin, F.; Meylan, G.; Kochanek, C. S.; Eulaers, E.; Cantale, N.; Mosquera, A. M.; Magain, P.; Van Winckel, H.; Sluse, D.; Cataldi, G.; Vörös, D.; Dye, S.

    2013-08-01

    We present the results from nine years of optically monitoring the gravitationally lensed zQSO = 0.658 quasar RX J1131-1231. The R-band light curves of the four individual images of the quasar were obtained using deconvolution photometry for a total of 707 epochs. Several sharp quasar variability features strongly constrain the time delays between the quasar images. Using three different numerical techniques, we measured these delays for all possible pairs of quasar images while always processing the four light curves simultaneously. For all three methods, the delays between the three close images A, B, and C are compatible with being 0, while we measured the delay of image D to be 91 days, with a fractional uncertainty of 1.5% (1σ), including systematic errors. Our analysis of random and systematic errors accounts in a realistic way for the observed quasar variability, fluctuating microlensing magnification over a broad range of temporal scales, noise properties, and seasonal gaps. Finally, we find that our time-delay measurement methods yield compatible results when applied to subsets of the data. Based on observations made with the 1.2-m Swiss Euler telescope (La Silla, Chile), the 1.3-m SMARTS telescope (Las Campanas, Chile), and the 1.2-m Mercator Telescope. Mercator is operated on the island of La Palma by the Flemish Community, at the Spanish Observatorio del Roque de los Muchachos of the Instituto de Astrofísica de Canarias.Light curves are available at the CDS via anonymous ftp to http://cdsarc.u-strasbg.fr (ftp://130.79.128.5) or via http://cdsarc.u-strasbg.fr/viz-bin/qcat?J/A+A/556/A22

  17. The impact of the climate on the epidemiology of Dirofilaria immitis in the pet population of the Canary Islands.

    PubMed

    Montoya-Alonso, J A; Carretón, E; Morchón, R; Silveira-Viera, L; Falcón, Y; Simón, F

    2016-01-30

    Cardiopulmonary dirofilariosis (heartworm) is a zoonotic vector borne disease caused by Dirofilaria immitis which affects domestic dogs and cats. Two of the seven Canary Islands are historically hyperendemic areas of dirofilariosis, although no epidemiological study has ever been carried out which includes the other islands. The aim of the study was to complete the epidemiological status of cardiopulmonary dirofilariosis in the canine and feline population throughout all the Canary Islands. 1643 client-owned dogs and 707 client-owned cats were tested for D. immitis antigens (dogs), and anti-D. immitis and anti-Wolbachia antibodies (cats). The prevalence of canine dirofilariosis in the Canary Islands was 15.7%, and the seroprevalence of feline dirofilariosis was 18.1%. A remarkable disparity was found when evaluating the results by island separately, which ranged from from 0% in Lanzarote and El Hierro, low prevalences and seroprevalences in Fuerteventura (1.8% and 2.5% in dogs and cats, respectively), to higher prevalences on the other 4 islands; ranging between 15.7% (dogs) and 14.3% (cats) in La Palma 22.5% (dogs) and 24.1% (cats) in Tenerife. In addition, prevalences and seroprevalences were very variable within each island, these differences being associated to local climate conditions. The distribution and prevalence of dirofilariosis in the Canary Islands is heterogeneous and related to climate, demographic factors and management of pets in the studied areas. Dirofilariosis remains hyperendemic in 4 of the 7 Islands. Since D. immitis is a zoonosis, veterinary and health authorities should be aware of the current prevalence and seroprevalence of animal dirofilariosis. The results show the need for awareness raising campaigns to promote the implementation of prophylactic measures in pets, in order to achieve a decrease in the prevalence of animal dirofilariosis in the Canary Islands.

  18. Dispersion of tsunamis: does it really matter?

    NASA Astrophysics Data System (ADS)

    Glimsdal, S.; Pedersen, G. K.; Harbitz, C. B.; Løvholt, F.

    2013-06-01

    This article focuses on the effect of dispersion in the field of tsunami modeling. Frequency dispersion in the linear long-wave limit is first briefly discussed from a theoretical point of view. A single parameter, denoted as "dispersion time", for the integrated effect of frequency dispersion is identified. This parameter depends on the wavelength, the water depth during propagation, and the propagation distance or time. Also the role of long-time asymptotes is discussed in this context. The wave generation by the two main tsunami sources, namely earthquakes and landslides, are briefly discussed with formulas for the surface response to the bottom sources. Dispersive effects are then exemplified through a semi-idealized study of a moderate-strength inverse thrust fault. Emphasis is put on the directivity, the role of the "dispersion time", the significance of the Boussinesq model employed (dispersive effect), and the effects of the transfer from bottom sources to initial surface elevation. Finally, the experience from a series of case studies, including earthquake- and landslide-generated tsunamis, is presented. The examples are taken from both historical (e.g. the 2011 Japan tsunami and the 2004 Indian Ocean tsunami) and potential tsunamis (e.g. the tsunami after the potential La Palma volcanic flank collapse). Attention is mainly given to the role of dispersion during propagation in the deep ocean and the way the accumulation of this effect relates to the "dispersion time". It turns out that this parameter is useful as a first indication as to when frequency dispersion is important, even though ambiguity with respect to the definition of the wavelength may be a problem for complex cases. Tsunamis from most landslides and moderate earthquakes tend to display dispersive behavior, at least in some directions. On the other hand, for the mega events of the last decade dispersion during deep water propagation is mostly noticeable for transoceanic propagation.

  19. Satellite-based climatology of low-level continental clouds in southern West Africa during the summer monsoon season

    NASA Astrophysics Data System (ADS)

    Linden, Roderick; Fink, Andreas H.; Redl, Robert

    2015-02-01

    Synoptic observations and various satellite products have been utilized for computing climatologies of low-level stratus over southern West Africa for the wet monsoon seasons July-September of 2006-2011. Previous studies found inconsistencies between satellite cloud products; climate models often fail to reproduce the extensive stratus decks. Therefore, a better observational reference and an understanding of its limitations are urgently needed to better validate models. Most detailed information of the spatiotemporal characteristics of low-level clouds was obtained from two Meteosat Second Generation (MSG) satellite-based data sets. However, CALIPSO and CloudSat cross sections of cloud occurrence frequency suggest that both MSG products underestimate the low-level cloudiness over Nigeria due to shielding by abundant upper level and midlevel clouds and reveal that the stratus is lower over the continent than over the ocean. The Terra Multiangle Imaging Spectroradiometer product appears to overestimate the morning extent of low-level clouds. The climatology presented here shows that the zone of abundant low-level stratiform clouds is at its diurnal minimum south of 6-7°N around sunset (~1800 UTC). Thereafter, it starts to spread inland and reaches its maximum northward extent of 10-11°N between 0900 and 1000 UTC. The maximum affected area is approximately 800,000 km2. After about 1000 UTC, the northern boundary gets fragmented due to the breakup of stratus decks into fair-weather cumuli. The stratus is most frequent around Cape Palmas, over Ivory Coast, and at the windward sides of the Mampong Range (Ghana) and Oshogbo Hills (Nigeria).

  20. Proper motions of embedded protostellar jets in Serpens

    NASA Astrophysics Data System (ADS)

    Djupvik, A. A.; Liimets, T.; Zinnecker, H.; Barzdis, A.; Rastorgueva-Foi, E. A.; Petersen, L. R.

    2016-03-01

    Aims: We determine the proper motion of protostellar jets around Class 0 and Class I sources in an active star forming region in Serpens. Methods: Multi-epoch deep images in the 2.122 μm line of molecular hydrogen, v = 1-0 S(1), obtained with the near-infrared instrument NOTCam on a timescale of 10 years, are used to determine the proper motion of knots and jets. K-band spectroscopy of the brighter knots is used to supply radial velocities, estimate extinction, excitation temperature, and H2 column densities towards these knots. Results: We measure the proper motion of 31 knots on different timescales (2, 4, 6, 8, and 10 years). The typical tangential velocity is around 50 km s-1 for the 10-year baseline, but for shorter timescales, a maximum tangential velocity up to 300 km s-1 is found for a few knots. Based on morphology, velocity information, and the locations of known protostars, we argue for the existence of at least three partly overlapping and deeply embedded flows, one Class 0 flow and two Class I flows. The multi-epoch proper motion results indicate time-variable velocities of the knots, for the first time directly measured for a Class 0 jet. We find in general higher velocities for the Class 0 jet than for the two Class I jets. While the bolometric luminosites of the three driving sources are about equal, the derived mass flow rate Ṁout is two orders of magnitude higher in the Class 0 flow than in the two Class I flows. Based on observations made with the Nordic Optical Telescope, operated on the island of La Palma jointly by Denmark, Finland, Iceland, Norway, and Sweden, in the Spanish Observatorio del Roque de los Muchachos of the Instituto de Astrofisica de Canarias.

  1. Doppler imaging of the young late-type star LO Pegasi (BD+22°4409) in 2003 September

    NASA Astrophysics Data System (ADS)

    Piluso, N.; Lanza, A. F.; Pagano, I.; Lanzafame, A. C.; Donati, J.-F.

    2008-06-01

    A Doppler image of the zero-age main-sequence (ZAMS) late-type rapidly rotating star LO Pegasi, based on spectra acquired between 2003 September 12 and 15 is presented. The least-squares deconvolution technique is applied to enhance the signal-to-noise ratio of the mean rotational broadened line profiles extracted from the observed spectra. In the present application, an unbroadened spectrum is used as a reference, instead of a simple line list, to improve the deconvolution technique applied to extract the mean profiles. The reconstructed image is similar to those previously obtained from observations taken in 1993 and 1998, and shows that LO Peg photospheric activity is dominated by high-latitude spots with a non-uniform polar cap. The latter seems to be a persistent feature as it has been observed since 1993 with little modifications. Small spots, observed between ~10° and ~60° of latitude, appears to be different with respect to those present in the 1993 and 1998 maps. Based on observations made with the Italian Telescopio Nazionale Galileo operated on the island of La Palma by the Centro Galileo Galilei of INAF (Istituto Nazionale di Astrofisica) at the Spanish Observatorio del Roque del los Muchachos of the Instituto de Astrofísica de Canarias. E-mail: nicolo.piluso@oact.inaf.it (NP); nuccio.lanza@oact.inaf.it (AFL); isabella.pagano@oact.inaf.it (IP); alessandro.lanzafame@oact.inaf.it (ACL); donati@ast.obs-mip.fr (J-FD)

  2. [Awakening of intensive care patients after prolonged continuous sedation].

    PubMed

    Acosta Mejuto, B; Delgado Hito, P; Mirabete Rodríguez, I; Sola Prado, A

    1998-01-01

    A study was made of the degree of orientation, cooperation, and anxiety of patients admitted to the Intensive Care Unit of the Hospital de la Santa Creu i Sant Pau (level III), at the conclusion of prolonged continuous sedation. Recovery time was evaluated, understood as the time required to achieve orientation in time, place, and person. The study was descriptive. An analysis was made of 37 patients who met inclusion criteria between July 1995 and March 1996. After discontinuing sedation, the Glasgow assessment was carried out (modified by Cook and Palma) every four hours until a score of > or = 14 was obtained. From then on, the degree of anxiety, using the Hamilton scale, and cooperation and orientation, using our own scales, were evaluated four times a day. The assessment concluded when the patient was oriented in time, space, and person. We recorded age, sex, disease, disease severity, previous admissions, type of sedation, need for additional bolus injections, and the state of anxiety as perceived by family members. Mean age of patients was 65.1 +/- 13.3 years; 81.1% were men. Respiratory disease was the most common pathology, mean SAPS was 10.7 +/- 2.6, and the most frequently administered drug was midazolam (81%). Patients required an average of 15 hours (164-0) to awaken and tended to taken longer to awake with midazolam. Once the were awake, the required 10 hours (48-0) hours before the were completely oriented. The degree of anxiety was mild and cooperation was regular during all measurements. No relation was found between variables. Our results suggest that a care plan designed to shorten temporal disorientation and promote cooperation would improve the quality of awakening.

  3. Measurement of night sky brightness in southern Australia

    NASA Astrophysics Data System (ADS)

    Hampf, Daniel; Rowell, Gavin; Wild, Neville; Sudholz, Tristan; Horns, Dieter; Tluczykont, Martin

    2011-09-01

    Night sky brightness is a major source of noise both for Cherenkov telescopes as well as for wide-angle Cherenkov detectors. Therefore, it is important to know the level of night sky brightness at potential sites for future experiments. The measurements of night sky brightness presented here were carried out at Fowler's Gap, a research station in New South Wales, Australia, which is a potential site for the proposed TenTen Cherenkov telescope system and the planned wide-angle Cherenkov detector system HiSCORE. A portable instrument was developed and measurements of the night sky brightness were taken in February and August 2010. Brightness levels were measured for a range of different sky regions and in various spectral bands. The night sky brightness in the relevant wavelength regime for photomultipliers was found to be at the same level as measured in similar campaigns at the established Cherenkov telescope sites of Khomas, Namibia, and at La Palma. The brightness of dark regions in the sky is about 2 × 10 12 photons/(s sr m 2) between 300 nm and 650 nm, and up to four times brighter in bright regions of the sky towards the galactic plane. The brightness in V band is 21.6 magnitudes per arcsec 2 in the dark regions. All brightness levels are averaged over the field of view of the instrument of about 1.3 × 10 -3 sr. The spectrum of the night sky brightness was found to be dominated by longer wavelengths, which allows to apply filters to separate the night sky brightness from the blue Cherenkov light. The possible gain in the signal to noise ratio was found to be up to 1.2, assuming an ideal low-pass filter.

  4. Biodiversity patterns of the marine benthic fauna on the Atlantic coast of tropical Africa in relation to hydroclimatic conditions and paleogeographic events

    NASA Astrophysics Data System (ADS)

    Lœuff, Pierre Le; von Cosel, Rudo

    1998-06-01

    Five different hydroclimatic regions are recognized in the tropical eastern Atlantic: the northern alternance region (Cape Blanc - Cape Verga), the atypical tropical region (Cape Palmas - border Benin/Nigeria), the southern alternance region (Cape Lopez - Cape Frio), all with periodical upwelling of colder water, and two intercalated typical tropical regions with warm water and reduced salinity. The faunal richness in the regions with upwelling is higher than in the typical tropical regions because many benthic species avoid warm and reduced salinity water. Faunistic exchange and affinity are greater between the upwelling zones and the bordering temperate zones. The cold regions are also more similar in faunal composition. Benthic communities in both tropical and temperate eastern Atlantic are not fundamentally different. Species diversity of benthic invertebrates in tropical West Africa is about the same order of magnitude as in Europe and the Mediterranean. Hydroclimatic conditions (upwelling, salinity reduction and internal waves with drastic temperature changes) and absence of coral reef formations do not favour the establishment and thriving of a warm stenohaline and stenotherm fauna in West Africa. Paleozoogeographic events, such as the formation of a large Euro-West African tropical province during the Miocene after the breakup of the Tethys, repeated climate deteriorations during Pliocene and Pleistocene with reductions of the tropical zone, sea level changes and large-scale extinction of warm-tropical species, are also factors responsible for the current low biodiversity in the tropical eastern Atlantic. Some species survived in two major relict pockets in Senegal and southern Angola with particular ecological conditions.

  5. Observations of the Monoceros SNR/Rosette nebula interacting region with the HEGRA system of IACTs

    NASA Astrophysics Data System (ADS)

    Lucarelli, F.; Konopelko, A.; Fonseca, V.; HEGRA Collaboration

    2001-08-01

    The array of 5 imaging atmospheric ˇCerenkov telescopes (IACTs) deployed at La Palma of Canary Island, and operated by the HEGRA (High Energy Gamma Ray Astronomy) collaboration, was used for the observations of the interaction region of the Monoceros SNR with the dense Rosette nebula for a total of about 120 hrs and 20 hrs in ONsource and OFF-source mode, respectively. At present the performance of the IACTs array reveals the energy threshold of 500 GeV and the angular resolution of 0.1° for γrays. Using the HEGRA system of IACTs of rather large field of view (4.3 degree in diameter), we have mapped the extended sky region of 2° × 2° associated with the Monoceros SNR/Rosette nebula and which is centered towards the hard spectrum X-ray point source SAX J0635+533. The EGRET unidentified source of diffuse γ-ray emission (3EG J0634+0521) observed in the energy range between 100 MeV 10 GeV, was effectively in the field of view of our present observations. Based on the Monte Carlo simulations and real data we have studied the response of the IACTs array over its 5 · 10-3 str field of view with respect to the cosmic rays and diffuse γ-ray emission. We have derived a normalization function which takes into account the slightly non uniform sensitivity to the γ-ray fluxes (with the variation of 10%) within the angular distance of 1 deg from the joint optical axis of the telescopes' array after the analysis by mean scaled Width. Here we present the result of the data analysis and its physical interpretation. Correspondence to: F. Lucarelli (Fabrizio.Lucarelli@mpi-hd.mpg.de)

  6. Silicon isotopes reveal recycled altered oceanic crust in the mantle sources of Ocean Island Basalts

    NASA Astrophysics Data System (ADS)

    Pringle, Emily A.; Moynier, Frédéric; Savage, Paul S.; Jackson, Matthew G.; Moreira, Manuel; Day, James M. D.

    2016-09-01

    The study of silicon (Si) isotopes in Ocean Island Basalts (OIB) has the potential to discern between different models for the origins of geochemical heterogeneities in the mantle. Relatively large (∼several per mil per atomic mass unit) Si isotope fractionation occurs in low-temperature environments during biochemical and geochemical precipitation of dissolved Si, where the precipitate is preferentially enriched in the lighter isotopes relative to the dissolved Si. In contrast, only a limited range (∼tenths of a per mil) of Si isotope fractionation has been observed from high-temperature igneous processes. Therefore, Si isotopes may be useful as tracers for the presence of crustal material within OIB mantle source regions that experienced relatively low-temperature surface processes in a manner similar to other stable isotope systems, such as oxygen. Characterizing the isotopic composition of the mantle is also of central importance to the use of the Si isotope system as a basis for comparisons with other planetary bodies (e.g., Moon, Mars, asteroids). Here we present the first comprehensive suite of high-precision Si isotope data obtained by MC-ICP-MS for a diverse suite of OIB. Samples originate from ocean islands in the Pacific, Atlantic, and Indian Ocean basins and include representative end-members for the EM-1, EM-2, and HIMU mantle components. On average, δ30Si values for OIB (-0.32 ± 0.09‰, 2 sd) are in general agreement with previous estimates for the δ30Si value of Bulk Silicate Earth (-0.29 ± 0.07‰, 2 sd; Savage et al., 2014). Nonetheless, some small systematic variations are present; specifically, most HIMU-type (Mangaia; Cape Verde; La Palma, Canary Islands) and Iceland OIB are enriched in the lighter isotopes of Si (δ30Si values lower than MORB), consistent with recycled altered oceanic crust and lithospheric mantle in their mantle sources.

  7. Chemical Abundances of Planetary Nebulae in the Substructures of M31

    NASA Astrophysics Data System (ADS)

    Fang, Xuan; García-Benito, Rubén; Guerrero, Martín A.; Liu, Xiaowei; Yuan, Haibo; Zhang, Yong; Zhang, Bing

    2015-12-01

    We present deep spectroscopy of planetary nebulae (PNe) that are associated with the substructures of the Andromeda Galaxy (M31). The spectra were obtained with the Optical System for Imaging and low-intermediate-Resolution Integrated Spectroscopy spectrograph on the 10.4 m Gran Telescopio Canarias. Seven targets were selected for the observations, three in the Northern Spur and four associated with the Giant Stream. The most distant target in our sample, with a rectified galactocentric distance ≥slant 100 kpc, was the first PN discovered in the outer streams of M31. The [O iii] λ4363 auroral line is well detected in the spectra of all targets, enabling electron temperature determination. Ionic abundances are derived based on the [O iii] temperatures, and elemental abundances of helium, nitrogen, oxygen, neon, sulfur, and argon are estimated. The relatively low N/O and He/H ratios, as well as abundance ratios of α-elements, indicate that our target PNe might belong to populations as old as ∼2 Gyr. Our PN sample, including the current seven and the previous three observed by Fang et al., have rather homogeneous oxygen abundances. The study of abundances and the spatial and kinematical properties of our sample leads to the tempting conclusion that their progenitors might belong to the same stellar population, which hints at a possibility that the Northern Spur and the Giant Stream have the same origin. This may be explained by the stellar orbit proposed by Merrett et al. Judging from the position and kinematics, we emphasize that M32 might be responsible for the two substructures. Deep spectroscopy of PNe in M32 will help to assess this hypothesis. Based on observations made with the Gran Telescopio Canarias, installed at the Spanish Observatorio del Roque de los Muchachos of the Instituto de Astrofísica de Canarias, in the island of La Palma. These observations are associated with program No. GTC55-14B.

  8. Chronic contamination assessment integrating biomarkers' responses in transplanted mussels--a seasonal monitoring.

    PubMed

    Pereira, C D S; Martín-Díaz, M L; Catharino, M G M; Cesar, A; Choueri, R B; Taniguchi, S; Abessa, D M S; Bícego, M C; Vasconcellos, M B A; Bainy, A C D; Sousa, E C P M; Delvalls, T A

    2012-05-01

    This study aimed to provide the first biomonitoring integrating biomarkers and bioaccumulation data in São Paulo coast, Brazil and, for this purpose, a battery of biomarkers of defense mechanisms was analyzed and linked to contaminants' body burden in a weigh-of-evidence approach. The brown mussel Perna perna was selected to be transplanted from a farming area (Caraguatatuba) to four possibly polluted sites: Engenho D'Água, DTCS (Dutos e Terminais do Centro-Oeste de São Paulo) oil terminal (Sao Sebastiao zone), Palmas Island, and Itaipu (It; Santos Bay zone). After 3 months of exposure in each season, mussels were recollected and the cytochrome P4501A (CYP1A)- and CYP3A-like activities, glutathione-S-transferase and antioxidants enzymes (catalase, glutathione peroxidase, and glutathione reductase) were analyzed in gills. The concentrations of polycyclic aromatic hydrocarbons, linear alkylbenzenes, and nonessential metals (Cr, Cd, Pb, and Hg) in whole tissue were also analyzed and data were linked to biomarkers' responses by multivariate analysis (principal component analysis-factor analysis). A representation of estimated factor scores was performed to confirm the factor descriptions and to characterize the studied stations. Biomarkers exhibited most significant alterations all year long in mussels transplanted to It, located at Santos Bay zone, where bioaccumulation of organic and inorganic compounds was detected. This integrated approach using transplanted mussels showed satisfactory results, pointing out differences between sites, seasons, and critical areas, which could be related to land-based contaminants' sources. The influence of natural factors and other contaminants (e.g., pharmaceuticals) on biomarkers' responses are also discussed.

  9. Kepler-432 b: a massive warm Jupiter in a 52-day eccentric orbit transiting a giant star

    NASA Astrophysics Data System (ADS)

    Ortiz, Mauricio; Gandolfi, Davide; Reffert, Sabine; Quirrenbach, Andreas; Deeg, Hans J.; Karjalainen, Raine; Montañés-Rodríguez, Pilar; Nespral, David; Nowak, Grzegorz; Osorio, Yeisson; Palle, Enric

    2015-01-01

    We study the Kepler object Kepler-432, an evolved star ascending the red giant branch. By deriving precise radial velocities from multi-epoch high-resolution spectra of Kepler-432 taken with the CAFE spectrograph at the 2.2 m telescope of Calar Alto Observatory and the FIES spectrograph at the Nordic Optical Telescope of Roque de Los Muchachos Observatory, we confirm the planetary nature of the object Kepler-432 b, which has a transit period of 52 days. We find a planetary mass of Mp = 5.84 ± 0.05MJup and a high eccentricity of e = 0.478 ± 0.004. With a semi-major axis of a = 0.303 ± 0.007 AU, Kepler-432 b is the first bona fide warm Jupiter detected to transit a giant star. We also find a radial velocity linear trend of γ˙ = 0.44 ± 0.04 m s-1 d-1, which suggests the presence of a third object in the system. Current models of planetary evolution in the post-main-sequence phase predict that Kepler-432 b will be most likely engulfed by its host star before the latter reaches the tip of the red giant branch. Based on observations collected at the German-Spanish Astronomical Center, Calar Alto, jointly operated by the Max-Planck-Institut für Astronomie (Heidelberg) and the Instituto de Astrofísica de Andalucía (IAA-CSIC, Granada).Based on observations obtained with the Nordic Optical Telescope, operated on the island of La Palma jointly by Denmark, Finland, Iceland, Norway, and Sweden, in the Spanish Observatorio del Roque de los Muchachos of the Instituto de Astrofísica de Canarias.Table 3 is available in electronic form at http://www.aanda.org

  10. Project management for complex ground-based instruments: MEGARA plan

    NASA Astrophysics Data System (ADS)

    García-Vargas, María. Luisa; Pérez-Calpena, Ana; Gil de Paz, Armando; Gallego, Jesús; Carrasco, Esperanza; Cedazo, Raquel; Iglesias, Jorge

    2014-08-01

    The project management of complex instruments for ground-based large telescopes is a challenge itself. A good management is a clue for project success in terms of performance, schedule and budget. Being on time has become a strict requirement for two reasons: to assure the arrival at the telescope due to the pressure on demanding new instrumentation for this first world-class telescopes and to not fall in over-costs. The budget and cash-flow is not always the expected one and has to be properly handled from different administrative departments at the funding centers worldwide distributed. The complexity of the organizations, the technological and scientific return to the Consortium partners and the participation in the project of all kind of professional centers working in astronomical instrumentation: universities, research centers, small and large private companies, workshops and providers, etc. make the project management strategy, and the tools and procedures tuned to the project needs, crucial for success. MEGARA (Multi-Espectrógrafo en GTC de Alta Resolución para Astronomía) is a facility instrument of the 10.4m GTC (La Palma, Spain) working at optical wavelengths that provides both Integral-Field Unit (IFU) and Multi-Object Spectrograph (MOS) capabilities at resolutions in the range R=6,000-20,000. The project is an initiative led by Universidad Complutense de Madrid (Spain) in collaboration with INAOE (Mexico), IAA-CSIC (Spain) and Universidad Politécnica de Madrid (Spain). MEGARA is being developed under contract with GRANTECAN.

  11. MEGARA: a new generation optical spectrograph for GTC

    NASA Astrophysics Data System (ADS)

    Gil de Paz, A.; Gallego, J.; Carrasco, E.; Iglesias-Páramo, J.; Cedazo, R.; Vílchez, J. M.; García-Vargas, M. L.; Arrillaga, X.; Carrera, M. A.; Castillo-Morales, A.; Castillo-Domínguez, E.; Eliche-Moral, M. C.; Ferrusca, D.; González-Guardia, E.; Lefort, B.; Maldonado, M.; Marino, R. A.; Martínez-Delgado, I.; Morales Durán, I.; Mujica, E.; Páez, G.; Pascual, S.; Pérez-Calpena, A.; Sánchez-Penim, A.; Sánchez-Blanco, E.; Tulloch, S.; Velázquez, M.; Zamorano, J.; Aguerri, A. L.; Barrado y Naváscues, D.; Bertone, E.; Cardiel, N.; Cava, A.; Cenarro, J.; Chávez, M.; García, M.; Guichard, J.; Gúzman, R.; Herrero, A.; Huélamo, N.; Hughes, D.; Jiménez-Vicente, J.; Kehrig, C.; Márquez, I.; Masegosa, J.; Mayya, Y. D.; Méndez-Abreu, J.; Mollá, M.; Muñoz-Tuñón, C.; Peimbert, M.; Pérez-González, P. G.; Pérez Montero, E.; Rodríguez, M.; Rodríguez-Espinosa, J. M.; Rodríguez-Merino, L.; Rosa-González, D.; Sánchez-Almeida, J.; Sánchez Contreras, C.; Sánchez-Blázquez, P.; Sánchez Moreno, F. M.; Sánchez, S. F.; Sarajedini, A.; Serena, F.; Silich, S.; Simón-Díaz, S.; Tenorio-Tagle, G.; Terlevich, E.; Terlevich, R.; Torres-Peimbert, S.; Trujillo, I.; Tsamis, Y.; Vega, O.; Villar, V.

    2014-07-01

    MEGARA (Multi-Espectrógrafo en GTC de Alta Resolución para Astronomía) is an optical Integral-Field Unit (IFU) and Multi-Object Spectrograph (MOS) designed for the GTC 10.4m telescope in La Palma. MEGARA offers two IFU fiber bundles, one covering 12.5x11.3 arcsec2 with a spaxel size of 0.62 arcsec (Large Compact Bundle; LCB) and another one covering 8.5x6.7 arcsec2 with a spaxel size of 0.42 arcsec (Small Compact Bundle; SCB). The MEGARA MOS mode will allow observing up to 100 objects in a region of 3.5x3.5 arcmin2 around the two IFU bundles. Both the LCB IFU and MOS capabilities of MEGARA will provide intermediate-to-high spectral resolutions (RFWHM~6,000, 12,000 and 18,700, respectively for the low-, mid- and high-resolution Volume Phase Holographic gratings) in the range 3650-9700ÅÅ. These values become RFWHM~7,000, 13,500, and 21,500 when the SCB is used. A mechanism placed at the pseudo-slit position allows exchanging the three observing modes and also acts as focusing mechanism. The spectrograph is a collimator-camera system that has a total of 11 VPHs simultaneously available (out of the 18 VPHs designed and being built) that are placed in the pupil by means of a wheel and an insertion mechanism. The custom-made cryostat hosts an E2V231-84 4kx4k CCD. The UCM (Spain) leads the MEGARA Consortium that also includes INAOE (Mexico), IAA-CSIC (Spain), and UPM (Spain). MEGARA is being developed under a contract between GRANTECAN and UCM. The detailed design, construction and AIV phases are now funded and the instrument should be delivered to GTC before the end of 2016.

  12. Purification and characterization of a thermostable α-galactosidase from Thielavia terrestris NRRL 8126 in solid state fermentation.

    PubMed

    Saad, Rawia R; Fawzi, Eman M

    2012-03-01

    Several seeds and husks of some plants belonging to leguminosae, Graminae, Compositae and Palmae were evaluated as carbon substrates to produce α-galactosidase (α-Gal) by the thermophilic fungus, Thielavia terrestris NRRL 8126 in solid substrate fermentation. The results showed that Cicer arietinum (chick pea seed) was the best substrate for α-Gal production. The crude enzyme was precipitated by ammonium sulphate (60%) and purified by gel filtration on sephadex G-100 followed by ion exchange chromatography on DEAE-Cellulose. The final purification fold of the enzyme was 30.42. The temperature and pH optima of purified α-Gal from Thielavia terrestris were 70 °C and 6.5, respectively. The enzyme showed high thermal stability at 70 °C and 75 °C and the half-life of the α-Gal at 90 °C was 45 min. Km of the purified enzyme was 1.31 mM. The purified enzyme was inhibited by Ag2+, Hg2+, Zn2+, Ba2+, Mg2+, Mn2+ and Fe2+ at 5 mM and 10 mM. Also, EDTA, sodium arsenate, L-cysteine and iodoacetate inhibited the enzyme activity. On the other hand, Ca2+, Cu2+, K+ and Na+ slightly enhanced the enzyme activity at 5 mM while at 10 mM they caused inhibition. The molecular weight of the α-Gal was estimated to be 82 kDa by sodium dodecyl sulfate-polyacrylamide gel electrophoresis. This enzyme displays a number of biochemical properties that make it a potentially strong candidate for biotechnological and medicinal applications.

  13. First on-sky validation of full LQG control with vibration mitigation on the CANARY MOAO pathfinder

    NASA Astrophysics Data System (ADS)

    Sivo, Gaetano; Kulcsar, Caroline; Conan, Jean-Marc; Raynaud, Henri-François; Gendron, Eric; Basden, Alastair; Vidal, Fabrice; Morris, Tim; Meimon, Serge; Petit, Cyril; Gratadour, Damien; Martin, Olivier; Hubert, Zoltan; Rousset, Gérard; Dipper, Nigel; Talbot, Gordon; Younger, Eddy; Myers, Richard

    2013-12-01

    Many concepts of Wide Field AO (WFAO) systems are under development, especially for Extremely Large Telescopes (ELTs) instruments. Multi-Object Adaptive Optics (MOAO) is one of these WFAO concepts, well suited to high redshifts galaxies observations in very wide Field of View (FoV). CANARY is the on-sky pathfinder for MOAO operated at the William Herschel Telescope (WHT, La Palma, Spain) since 2010. We have demonstrated that Linear Quadratic Gaussian (LQG) control was an appealing strategy in this context [Sivo-SPIE2012], which moreover provides optimal performance (in the sense of minimum residual phase variance) with respect to the chosen models . It is based on a unified formalism that allows accounting for multi WaveFront Sensors (WFSs) channels, both on Laser Guide Stars (LGSs) and NGSs, and for various disturbance sources (turbulence, vibrations). We present the very first on-sky IR images recorded with full LQG AO. This world premiere has been obtained this summer 2012 at WHT on the CANARY demonstrator. Two AO configurations have been tested: single-conjugated AO and multi-object AO with NGS and NGS+LGS. These results demonstrate the practical implementation of LQG control for tomographic AO, as well as the efficiency of our strategy for vibration identification and filtering on tip-tilt. These very successful results are analyzed in terms of performance, and the influence of turbulence conditions and control tuning parameters is discussed. Note that this very first demonstration has been made possible thanks to a close collaboration between the CANARY teams (Durham University, Observatoire de Paris LESIA-GEPI, IOGS/L2TI-UP13, ONERA, UK ATC, ING).

  14. On-sky validation of an optimal LQG control with vibration mitigation: from the CANARY Multi-Object Adaptive Optics demonstrator to the Gemini Multi-Conjugated Adaptive Optics facility.

    NASA Astrophysics Data System (ADS)

    Sivo, Gaetano; Kulcsár, Caroline; Conan, Jean-Marc; Raynaud, Henri-François; Gendron, Éric; Basden, Alastair; Gratadour, Damien; Morris, Tim; Petit, Cyril; Meimon, Serge; Rousset, Gérard; Garrel, Vincent; Neichel, Benoit; van Dam, Marcos; Marin, Eduardo; Carrasco, Rodrigo; Schirmer, Mischa; Rambold, William; Moreno, Cristian; Montes, Vanessa; Hardie, Kayla; Trujillo, Chad

    2015-01-01

    Adaptive optics provides real time correction of wavefront perturbations on ground-based telescopes and allow to reach the diffraction limit performances. Optimizing control and performance is a key issue for ever more demanding instruments on ever larger telescopes affected not only by atmospheric turbulence, but also by vibrations, windshake and tracking errors. Linear Quadratic Gaussian control achieves optimal correction when provided with a temporal model of the disturbance. We present in this paper the first on-sky results of a Kalman filter based LQG control with vibration mitigation on the CANARY instrument at the Nasmyth platform of the 4.2-m William Herschel Telescope (La Palma, Spain). The results demonstrate a clear improvement of performance for full LQG compared with standard integrator control, and assess the additional improvement brought by vibration filtering with a tip-tilt model identified from on-sky data (by 10 points of Strehl ratio), thus validating the strategy retained on the instrument SPHERE (eXtreme-AO system for extra-solar planets detection and characterization) at the VLT. The MOAO on-sky pathfinder CANARY features two AO configurations that have both been tested: single- conjugated AO and multi-object AO with NGS and NGS+ Rayleigh LGS, together with vibration mitigation on tip and tilt modes. We finally present the ongoing development done to commission such a control law on a regular Sodium laser Multi-Conjuagated Adaptive Optics (MCAO) system GeMS at the 8-m Gemini South Telescope. This implementation does not require new hardware and is already available in the real-time computer.

  15. Asteroids' physical models from combined dense and sparse photometry and scaling of the YORP effect by the observed obliquity distribution

    NASA Astrophysics Data System (ADS)

    Hanuš, J.; Ďurech, J.; Brož, M.; Marciniak, A.; Warner, B. D.; Pilcher, F.; Stephens, R.; Behrend, R.; Carry, B.; Čapek, D.; Antonini, P.; Audejean, M.; Augustesen, K.; Barbotin, E.; Baudouin, P.; Bayol, A.; Bernasconi, L.; Borczyk, W.; Bosch, J.-G.; Brochard, E.; Brunetto, L.; Casulli, S.; Cazenave, A.; Charbonnel, S.; Christophe, B.; Colas, F.; Coloma, J.; Conjat, M.; Cooney, W.; Correira, H.; Cotrez, V.; Coupier, A.; Crippa, R.; Cristofanelli, M.; Dalmas, Ch.; Danavaro, C.; Demeautis, C.; Droege, T.; Durkee, R.; Esseiva, N.; Esteban, M.; Fagas, M.; Farroni, G.; Fauvaud, M.; Fauvaud, S.; Del Freo, F.; Garcia, L.; Geier, S.; Godon, C.; Grangeon, K.; Hamanowa, H.; Hamanowa, H.; Heck, N.; Hellmich, S.; Higgins, D.; Hirsch, R.; Husarik, M.; Itkonen, T.; Jade, O.; Kamiński, K.; Kankiewicz, P.; Klotz, A.; Koff, R. A.; Kryszczyńska, A.; Kwiatkowski, T.; Laffont, A.; Leroy, A.; Lecacheux, J.; Leonie, Y.; Leyrat, C.; Manzini, F.; Martin, A.; Masi, G.; Matter, D.; Michałowski, J.; Michałowski, M. J.; Michałowski, T.; Michelet, J.; Michelsen, R.; Morelle, E.; Mottola, S.; Naves, R.; Nomen, J.; Oey, J.; Ogłoza, W.; Oksanen, A.; Oszkiewicz, D.; Pääkkönen, P.; Paiella, M.; Pallares, H.; Paulo, J.; Pavic, M.; Payet, B.; Polińska, M.; Polishook, D.; Poncy, R.; Revaz, Y.; Rinner, C.; Rocca, M.; Roche, A.; Romeuf, D.; Roy, R.; Saguin, H.; Salom, P. A.; Sanchez, S.; Santacana, G.; Santana-Ros, T.; Sareyan, J.-P.; Sobkowiak, K.; Sposetti, S.; Starkey, D.; Stoss, R.; Strajnic, J.; Teng, J.-P.; Trégon, B.; Vagnozzi, A.; Velichko, F. P.; Waelchli, N.; Wagrez, K.; Wücher, H.

    2013-03-01

    Context. The larger number of models of asteroid shapes and their rotational states derived by the lightcurve inversion give us better insight into both the nature of individual objects and the whole asteroid population. With a larger statistical sample we can study the physical properties of asteroid populations, such as main-belt asteroids or individual asteroid families, in more detail. Shape models can also be used in combination with other types of observational data (IR, adaptive optics images, stellar occultations), e.g., to determine sizes and thermal properties. Aims: We use all available photometric data of asteroids to derive their physical models by the lightcurve inversion method and compare the observed pole latitude distributions of all asteroids with known convex shape models with the simulated pole latitude distributions. Methods: We used classical dense photometric lightcurves from several sources (Uppsala Asteroid Photometric Catalogue, Palomar Transient Factory survey, and from individual observers) and sparse-in-time photometry from the U.S. Naval Observatory in Flagstaff, Catalina Sky Survey, and La Palma surveys (IAU codes 689, 703, 950) in the lightcurve inversion method to determine asteroid convex models and their rotational states. We also extended a simple dynamical model for the spin evolution of asteroids used in our previous paper. Results: We present 119 new asteroid models derived from combined dense and sparse-in-time photometry. We discuss the reliability of asteroid shape models derived only from Catalina Sky Survey data (IAU code 703) and present 20 such models. By using different values for a scaling parameter cYORP (corresponds to the magnitude of the YORP momentum) in the dynamical model for the spin evolution and by comparing synthetic and observed pole-latitude distributions, we were able to constrain the typical values of the cYORP parameter as between 0.05 and 0.6. Table 3 is available in electronic form at http://www.aanda.org

  16. Measurements of magnetic field strength on T Tauri stars

    NASA Astrophysics Data System (ADS)

    Guenther, Eike W.; Lehmann, Holger; Emerson, James P.; Staude, Jürgen

    1999-01-01

    We have investigated the magnetic field strength of one weak-line and four classical T Tauri stars. The magnetic field strength is derived from the differential change of the equivalent width of photospheric Fe I lines in the presence of a magnetic field, calculated using a full radiative transfer code. The method was successfully tested by applying it to a non-magnetic solar-type star, and to VY Ari which is believed to have a strong magnetic field. For two of the classical T Tauri stars, we find a product of magnetic field strength and filling factor B * f = (2.35+/- 0.15) kG for T Tau, and B * f = (1.1+/- 0.2) kG for LkCa 15. For the classical T Tauri star UX Tau A and the weak-line T Tauri star LkCa 16 the detection is only marginal, indicating magnetic field strengths of the order of 1 kG and possibly of more than 2 kG, respectively. No field could be detected for the classical T Tauri star GW Ori. For the two classical T Tauri stars for which we have detected a field, we find the filling factors to be larger than ~ 0.5, which indicates that the magnetic field covers most of the photosphere. We also show that ignoring a magnetic field can, depending on the lines used, result in errors in effective temperature and underestimates of veiling. Based on observations made with the William Herschel Telescope operated on the island of La Palma by the Royal Greenwich Observatory in the Spanish Observatorio de los Roque de los Muchachos of the Instituto de Astrofisica de Canarias

  17. Draining mafic magma from conduits during Strombolian eruption

    NASA Astrophysics Data System (ADS)

    Wadsworth, F. B.; Kennedy, B.; Branney, M. J.; Vasseur, J.; von Aulock, F. W.; Lavallée, Y.; Kueppers, U.

    2014-12-01

    During and following eruption, mafic magmas can readily drain downward in conduits, dykes and lakes producing complex and coincident up-flow and down-flow textures. This process can occur at the top of the plumbing system if the magma outgases as slugs or through porous foam, causing the uppermost magma surface to descend and the magma to densify. In this scenario the draining volume is limited by the gas volume outgassed. Additionally, magma can undergo wholesale backflow when the pressure at the base of the conduit or feeder dyke exceeds the driving pressure in the chamber beneath. This second scenario will continue until pressure equilibrium is established. These two scenarios may occur coincidently as local draining of uppermost conduit magma by outgassing can lead to wholesale backflow because the densification of magma is an effective way to modify the vertical pressure profile in a conduit. In the rare case where conduits are preserved in cross section, the textural record of draining is often complex and great care should be taken in interpreting bimodal kinematic trends in detail. Lateral cooling into country rock leads to lateral profiles of physical and flow properties and, ultimately, outgassing potential, and exploration of such profiles elucidates the complexity involved. We present evidence from Red Crater volcano, New Zealand, and La Palma, Canary Islands, where we show that at least one draining phase followed initial ascent and eruption. We provide a rheological model approach to understand gravitational draining velocities and therefore, the timescales of up- and down-flow cycles predicted. These timescales can be compared with observed geophysical signals at monitored mafic volcanoes worldwide. Finally, we discuss the implications of shallow magma draining for edifice stability, eruption longevity and magma-groundwater interaction.

  18. The effects of agriculture on the volcanic aquifers of the canary islands

    NASA Astrophysics Data System (ADS)

    Custodio, E.; Guerra, J. A.; Jiménez, J.; Medina, J. A.; Soler, C.

    1983-12-01

    Agriculture is a basic economic activity in the Canary Islands, a Spanish region in the Atlantic Ocean, facing the Sahara. The main crops are bananas, tomatoes, and other special ones suitable for exportation. Fertilizers are applied in high quantities on the scarce land available. The relatively good vertical permeability of the soils favors the deep infiltration of irrigation return flows. Water is obtained by an extraordinary net of shaft wells and water galleries, supplemented when possible by surface reservoirs in the deep gullies. Water is distributed by an extensive network of pipes and canals, allowing the transportation of water to virtually any point from any water source. Water quality is widely variable, from almost rain water to brackish, with a high frequency of sodium bicarbonate types. Return flows, especially when water is applied with good irrigation techniques and the original quality is poor, are saline and contain chemicals leached from the fertilizers. On Tenerife Island, most of the return flows go to coastal aquifers, while most of the water comes from high-altitude water galleries. Agricultural pollution is not generally appraised, but it exists. It can be masked by the frequent, high natural nitrate content in groundwater. On Gran Canaria Island, since water comes mainly from deep shaft wells near the irrigated areas, the nitrate pollution is much more clear. On La Palma Island, besides the nitrate pollution, a potassium pollution of agricultural origin has been mentioned. Other situations on the remaining islands are also discussed. It can be concluded that agriculture is a big concern for the water quality in many areas and impairs its suitability for other uses. Because of the great depth of the water table, the nitrate pollution may not become obvious for many years, especially for the deep-water galleries.

  19. Geomatic methods applied to the study of the front position changes of Johnsons and Hurd Glaciers, Livingston Island, Antarctica, between 1957 and 2013

    NASA Astrophysics Data System (ADS)

    Rodríguez Cielos, Ricardo; Aguirre de Mata, Julián; Díez Galilea, Andrés; Álvarez Alonso, Marina; Rodríguez Cielos, Pedro; Navarro Valero, Francisco

    2016-08-01

    Various geomatic measurement techniques can be efficiently combined for surveying glacier fronts. Aerial photographs and satellite images can be used to determine the position of the glacier terminus. If the glacier front is easily accessible, the classic surveys using theodolite or total station, GNSS (Global Navigation Satellite System) techniques, laser-scanner or close-range photogrammetry are possible. When the accessibility to the glacier front is difficult or impossible, close-range photogrammetry proves to be useful, inexpensive and fast. In this paper, a methodology combining photogrammetric methods and other techniques is applied to determine the calving front position of Johnsons Glacier. Images taken in 2013 with an inexpensive nonmetric digital camera are georeferenced to a global coordinate system by measuring, using GNSS techniques, support points in accessible areas close to the glacier front, from which control points in inaccessible points on the glacier surface near its calving front are determined with theodolite using the direct intersection method. The front position changes of Johnsons Glacier during the period 1957-2013, as well as those of the land-terminating fronts of Argentina, Las Palmas and Sally Rocks lobes of Hurd glacier, are determined from different geomatic techniques such as surface-based GNSS measurements, aerial photogrammetry and satellite optical imagery. This provides a set of frontal positions useful, e.g., for glacier dynamics modeling and mass balance studies.Link to the data repository: https://doi.pangaea.de/10.1594/PANGAEA.845379.

  20. Activity from the Be/X-ray binary system V0332+53 during its intermediate-luminosity outburst in 2008

    NASA Astrophysics Data System (ADS)

    Caballero-García, M. D.; Camero-Arranz, A.; Özbey Arabacı, M.; Zurita, C.; Suso, J.; Gutiérrez-Soto, J.; Beklen, E.; Kiaeerad, F.; Garrido, R.; Hudec, R.

    2016-05-01

    Aims: We present a study of the Be/X-ray binary system V 0332+53 with the main goal of characterizing its behaviour mainly during the intermediate-luminosity X-ray event in 2008. In addition, we aim to contribute to the understanding of the behaviour of the donor companion by including optical data from our dedicated campaign starting in 2006. Methods: V 0332+53 was observed by RXTE and Swift during the decay of the intermediate-luminosity X-ray outburst of 2008, and with Suzaku before the rising of the third normal outburst of the 2010 series. In addition, we present recent data from the Spanish ground-based astronomical observatories of El Teide (Tenerife), Roque de los Muchachos (La Palma), and Sierra Nevada (Granada), and since 2006 from the Turkish TÜBİTAK National Observatory (Antalya). We have performed temporal analyses to investigate the transient behaviour of this system during several outbursts. Results: Our optical study revealed that continuous mass ejection episodes from the Be star have been taking place since 2006 and another is currently ongoing. The broad-band 1-60 keV X-ray spectrum of the neutron star during the decay of the 2008 outburst was well fitted with standard phenomenological models that were enhanced by an absorption feature of unknown origin at about 10 keV and a narrow iron K-alpha fluorescence line at 6.4 keV. For the first time in V 0332+53 we tentatively see an increase in the cyclotron line energy with increasing flux (although further and more sensitive observations are needed to confirm this). The fast aperiodic variability shows a quasi-periodic oscillation (QPO) at 227 ± 9 mHz only during the lowest luminosities, which might indicate that the inner regions surrounding the magnetosphere are more visible during the lowest flux states.