Science.gov

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. Seed banks on Attalea phalerata (Arecaceae) stems in the Pantanal wetland, Brazil

    PubMed Central

    Corrêa, Christiane E.; Fischer, Erich; dos Santos, Flavio A. M.

    2012-01-01

    Background and Aims Seeds can accumulate in the soil or elsewhere, such as on the stems of palms when these are covered by persistent sheaths. These sheaths could act as a safe site for some species. Here, we studied whether persistent sheaths of the palm Attalea phalerata (Arecaceae) are available sites for seed accumulation in the Pantanal wetland of Brazil. We also investigated whether the composition, richness and diversity of species of seeds in the persistent sheaths are determined by habitat (riparian forest and forest patches) and/or season (wet and dry). Methods All accumulated material was collected from ten persistent sheaths along the stems of 64 A. phalerata individuals (16 per habitat and 16 per season). The material was then individually inspected under a stereomicroscope to record seed species and number. Key Results Of the 640 sheaths sampled, 65 % contained seeds (n = 3468). This seed bank included 75 species belonging to 12 families, and was primarily composed of small, endozoochoric seeds, with a few abundant species (Cecropia pachystachya and Ficus pertusa). Moraceae was the richest family (four species) and Urticaceae the most abundant (1594 seeds). Stems of A. phalerata in the riparian forest had 1·8 times more seeds and 1·3 times more species than those in forest patches. In the wet season we sampled 4·1 times more seeds and 2·2 more species on palm stems than in the dry season. Richness did not differ between habitats, but was higher in the wet season. Abundance was higher in forest patches and in the wet season. Conclusions Attalea phalerata stems contain a rich seed bank, comparable to soil seed banks of tropical forests. As most of these seeds are not adapted to grow in flooding conditions, palm stems might be regarded as safe sites for seeds (and seedlings) to escape from the seasonal flooding of the Pantanal. PMID:22210851

  4. 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

    2015-01-01

    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. PMID:26125852

  5. 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. PMID:26743910

  6. 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

  7. A Comparison of the Physicochemical Properties and Fatty Acid Composition of Indaiá (Attalea dubia) and Babassu (Orbignya phalerata) Oils

    PubMed Central

    Silva Ferreira, Bianca; Pereira Faza, Lara; 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

  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. The 2011 Eta-Aquariids observing campaign from La Palma

    NASA Astrophysics Data System (ADS)

    Bettonvil, Felix; Weiland, Thomas

    2013-01-01

    Because the Eta-Aquariids, the most prominent stream for Southern Hemisphere observers, are difficult to watch from mid-northern latitudes, a week-long visual observing campaign was carried out in May 2011 from La Palma, Canary Islands, Spain. There, on the grounds of the Observatorio del Roque de Los Muchachos (ORM), at an altitude of more than 2000 m above sea level, observing conditions were nearly perfect. As a consequence, we managed to record more than 300 Eta-Aquariids in about 30 hours of effective observing time. An impression of the campaign together with a summary of the results is given.

  10. 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.

  11. 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

  12. 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

  13. 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

  14. 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

  15. 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

  16. The CMC15, the last issue of the series ``Carlsberg Meridian Catalogue, La Palma''

    NASA Astrophysics Data System (ADS)

    Muiños, J. L.; Evans, D. W.

    CMC15 is the last of the series ``Carlsberg Meridian Catalogue, La Palma'' and comprises all the observations made between March 1999 and March 2011 with the Carlsberg Automatic Meridian Circle in El Roque de los Muchachos Observatory on the island of La Palma (Spain). The catalogues CMC12, CMC13, and CMC14 are superseded by this one. It contains more than 122 million observations of right ascension, declination, and magnitude of stars in the magnitude range of {9{m}< r' <17{m}} and declination range of {-40°<δ<+50°}. The catalogue internal errors in astrometry are below 30 mas in both coordinates for stars brighter than {r'=13}, reaching 60 mas for r'=16. The internal magnitude error is below 0.020 mag for stars brighter than r'=13, and about 0.090 mag for r'=16.

  17. Analysis of the fraction of clear sky at the La Palma and Mt Graham sites

    NASA Astrophysics Data System (ADS)

    Della Valle, A.; Maruccia, Y.; Ortolani, S.; Zitelli, V.

    2010-01-01

    The amount of available telescope time is one of the most important requirements when selecting astronomical sites, as it affects the performance of ground-based telescopes. We present a quantitative survey of cloud coverage at La Palma and Mt Graham using both ground- and satellite-based data. The aim of this work is to derive clear nights for the satellite infrared channels and to verify the results using ground-based observations. At La Palma, we found a mean percentage of clear nights of 62.6 per cent from ground-based data and 71.9 per cent from satellite-based data. Taking into account the fraction of common nights, we found a concordance of 80.7 per cent of clear nights for ground- and satellite-based data. At Mt Graham, we found a 97 per cent agreement between the Columbine heliograph and the night-time observing log. From the Columbine heliograph and the Total Ozone Mapping Spectrometer-Ozone Monitoring Instrument (TOMS-OMI) satellite, we found that about 45 per cent of nights were clear, while satellite data (GOES, TOMS) are much more dispersed than those of La Palma. Setting a statistical threshold, we retried a comparable seasonal trend between the heliograph and satellite.

  18. 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

  19. 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

  20. Recurrent large-scale landsliding on the west flank of La Palma, Canary Islands

    NASA Astrophysics Data System (ADS)

    Urgeles, Roger; Masson, Douglas G.; Canals, Miquel; Watts, Anthony B.; Le Bas, Tim

    1999-11-01

    A large area of debris avalanche deposits has been discovered on the western submarine flanks of the island of La Palma. Multibeam bathymetry and its derivative backscatter data, Towed Ocean Bottom Instrument (TOBI) sidescan sonar images, and 3.5 kHz and airgun seismic reflection data have been used to identify at least two, and possibly as many as four, major landslide events. The youngest of the events, the Cumbre Nueva Debris Avalanche, extends onshore into the valleys bounded by the Caldera de Taburiente and Cumbre Nueva Ridge, which mark the degraded collapse scars. Radiometric dating of the volcanic flows in the headwall indicate an age of between 536 and 125 ka for this landslide. The debris avalanche covers an area of 780 km2, has a maximum thickness of 500 m, and has an estimated volume of 95 km3. Older deposits, collectively referred to as the Playa de la Veta Debris Avalanche Complex, are probably, as the name indicates, an amalgamation of at least two or three events rather than the result of a single catastrophic failure. The Playa de la Veta Debris Avalanche Complex is associated onshore with an unconformity dated as late Matuyama (1 Ma to 800 ka). It covers an area of 1200 km2, has a maximum thickness of 1300 m, and may represent a total volume of up to 650 km3. The greater thicknesses and limited areas occupied by debris avalanches on the western flank of La Palma, compared to other landslides in the Canary Archipelago, suggest that the La Palma landslide masses have relatively low mobility. The different debris avalanche lobes formed by each landslide event are separated by channels 2-2.5 km wide. The clear relationship between channel position and the boundaries of each debris avalanche lobe indicates that debris avalanches control later channel formation and pathways. The relief of the submarine flanks of the La Palma volcanoes, in the areas of island slope unaffected by landslides, is mainly the result of constructional volcanic processes

  1. 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.

  2. 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

  3. 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

  4. 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

  5. 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.

  6. An RAS Specialist Meeting, London, 14 October 2005: "Science from La Palma - Looking Beyond 2009"

    NASA Astrophysics Data System (ADS)

    Lennon, D.; Evans, C.; Drew, J.

    2005-12-01

    In 2009 the international agreement setting up the Roque de los Muchachos Observatory on the island of La Palma will have been in existence for a period of 30 years. In 2007 the United Kingdom will have to make a decision on whether or not to withdraw from that agreement and PPARC, through its ownership of the Isaac Newton Group of Telescopes, has the responsibility of deciding on the UK's involvement in the observatory beyond 2009. As part of the decision making process, and in support of the UK's overall strategic re-evaluation in astronomy, the ING was reviewed during 2005. It was therefore thought timely to assess recent scientific achievements from the Roque de los Muchachos, and to consider what role the observatory might have beyond 2009. Under the auspices of the Royal Astronomical Society a Specialist Meeting was held in Burlington House, Piccadilly, London on October 14th 2005 and was attended by approximately 100 astronomers from around the UK.

  7. Daytime site characterisation of La Palma, and its relation to night-time conditions

    NASA Astrophysics Data System (ADS)

    Townson, Matthew J.; Kellerer, Aglaé; Osborn, James; Butterley, Timothy; Morris, Timothy; Wilson, Richard W.

    2014-07-01

    This paper presents preliminary daytime profiles taken using a Wide-Field Shack-Hartmann Sensor at the Swedish Solar Telescope (SST), La Palma. These are contrasted against Stereo-SCIDAR data from corresponding nights to assess the validity of the assumptions currently used for simulating the performances of possible Multi-Conjugate Adaptive Optics (MCAO) systems for future solar telescopes, especially the assumption that the structure of the high altitude turbulence is mostly similar between the day and the night. We find that for our data both the altitude and the strength of the turbulence differ between the day and the night, although more data is required to draw any conclusions about typical behaviour and conditions.

  8. 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.

  9. 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

  10. Carlsberg meridian catalogue La Palma (Spain). Number 6: Observations of positions of stars and planets 1990

    NASA Astrophysics Data System (ADS)

    Positions and magnitudes of 12,771 stars north of declination -45 deg, 11,555 proper motions, and 1,368 positions and magnitudes of 69 solar system objects obtained with the Carlsberg Automatic Meridian Circle on La Palma (Canary Islands) during the year 1990. The positions of the stars are for the epoch of observation and the equinox J2000.0, and are in a system close to that of the FK5. The limiting magnitude is mv = 14.8. The catalog mainly comprises the following stars: 4143 faint reference stars in a global net; 3162 International Reference Stars; 1040 faint reference stars in the fields of about 200 benchmark radio sources; 889 A5-G0 stars near the north galactic pole; 535 stars from an unbiased sample of K-M dwarfs; and 751 stars in nearby O-B associations. The catalog also contains observations of Callisto, Titan, Iapetus, Uranus, Neptune, Pluto, and 63 minor planets. The mean error of a catalog position in the zenith is 0.08 sec in right ascension and declination, and 0.04 min in magnitude. The mean error of the proper motions, derived by combining the position in this catalog with those at earlier epochs, is typically 0.002 sec per year. Cross references are given to DM, AGK, SAO, HD, and the double star catalogs ADS and WDS.

  11. Depth profile of 236U/238U in soil samples in La Palma, Canary Islands

    PubMed Central

    Srncik, M.; Steier, P.; Wallner, G.

    2011-01-01

    The vertical distribution of the 236U/238U isotopic ratio was investigated in soil samples from three different locations on La Palma (one of the seven Canary Islands, Spain). Additionally the 240Pu/239Pu atomic ratio, as it is a well establish tool for the source identification, was determined. The radiochemical procedure consisted of a U separation step by extraction chromatography using UTEVA® Resin (Eichrom Technologies, Inc.). Afterwards Pu was separated from Th and Np by anion exchange using Dowex 1x2 (Dow Chemical Co.). Furthermore a new chemical procedure with tandem columns to separate Pu and U from the matrix was tested. For the determination of the uranium and plutonium isotopes by alpha spectrometry thin sources were prepared by microprecipitation techniques. Additionally these fractions separated from the soil samples were measured by Accelerator Mass Spectrometry (AMS) to get information on the isotopic ratios 236U/238U, 240Pu/239Pu and 236U/239Pu, respectively. The 236U concentrations [atoms/g] in each surface layer (∼2 cm) were surprisingly high compared to deeper layers where values around two orders of magnitude smaller were found. Since the isotopic ratio 240Pu/239Pu indicated a global fallout signature we assume the same origin as the probable source for 236U. Our measured 236U/239Pu value of around 0.2 is within the expected range for this contamination source. PMID:21481502

  12. Clay minerals as alteration products in basaltic volcaniclastic deposits of La Palma (Canary Islands, Spain)

    NASA Astrophysics Data System (ADS)

    García-Romero, E.; Vegas, J.; Baldonedo, J. L.; Marfil, R.

    2005-02-01

    Clay minerals from several volcaniclastic environments including pyroclastic (tuffs), epiclastic (lacustrine, alluvial terraces, marine fan delta) and unconformity-related paleosols in La Palma (Canary Islands) were studied by XRD, SEM, TEM, HRTEM imaging and AEM. Clay minerals and their assemblages allowed us to distinguish between primary volcaniclastic basaltic material produced directly by pyroclastic eruptions and epiclastic volcaniclastic material derived from erosion of pre-existing volcanic rocks. The clay fractions consist mainly of smectite with minor chlorite, mica, chlorite-smectite mixed-layers and talc. Phyllosilicates of the epiclastic units display wider compositional variations owing to wide variations in the mineralogical and chemical composition of the parent material. Most of the phyllosilicates (mica, corrensite, talc and chlorite) are inherited minerals derived from the erosion of the Basement Complex Unit, which had undergone hydrothermal alteration. Smectites of the epiclastic units are saponite and beidellite-montmorillonite derived from the hydrothermal Basement Complex Unit and from volcanic materials altered in the sedimentary environment. Conversely, clay minerals of unconformity-related paleosols are dominated by smectite composed of variable mixtures of saponite and beidellite, which were formed by pedogenetic processes with later hydrothermal influence. The mineralogical association in the pyroclastic unit is dominated by hydrothermally formed smectite (beidellite-montmorillonite), zeolites and calcite. This paper contributes to the differentiation between pyroclastic and epiclastic volcaniclastic rocks of several depositional settings in a basaltic volcanic complex by their clay minerals characterization.

  13. Lagrangian transport in a microtidal coastal area: the Bay of Palma, island of Mallorca, Spain

    NASA Astrophysics Data System (ADS)

    Hernández-Carrasco, I.; López, C.; Orfila, A.; Hernández-García, E.

    2013-10-01

    Coastal transport in the Bay of Palma, a small region in the island of Mallorca, Spain, is characterized in terms of Lagrangian descriptors. The data sets used for this study are the output for two months (one in autumn and one in summer) of a high resolution numerical model, ROMS (Regional Ocean Model System), forced atmospherically and with a spatial resolution of 300 m. The two months were selected because of their different wind regime, which is the main driver of the sea dynamics in this area. Finite-size Lyapunov exponents (FSLEs) were used to locate semi-persistent Lagrangian coherent structures (LCS) and to understand the different flow regimes in the bay. The different wind directions and regularity in the two months have a clear impact on the surface bay dynamics, whereas only topographic features appear clearly in the bottom structures. The fluid interchange between the bay and the open ocean was studied by computing particle trajectories and residence time (RT) maps. The escape rate of particles out of the bay is qualitatively different, with a 32% greater escape rate of particles to the ocean in October than in July, owing to the different geometric characteristics of the flow. We show that LCSs separate regions with different transport properties by displaying spatial distributions of residence times on synoptic Lagrangian maps together with the location of the LCSs. Correlations between the time-dependent behavior of FSLE and RT are also investigated, showing a negative dependence when the stirring characterized by FSLE values moves particles in the direction of escape.

  14. The magma plumbing system for the 1971 Teneguía eruption on La Palma, Canary Islands

    NASA Astrophysics Data System (ADS)

    Barker, Abigail K.; Troll, Valentin R.; Carracedo, Juan Carlos; Nicholls, Peter A.

    2015-12-01

    The 1971 Teneguía eruption is the most recent volcanic event of the Cumbre Vieja rift zone on La Palma. The eruption produced basanite lavas that host xenoliths, which we investigate to provide insight into the processes of differentiation, assimilation and magma storage beneath La Palma. We compare our results to the older volcano magmatic systems of the island with the aim to reconstruct the temporal development of the magma plumbing system beneath La Palma. The 1971 lavas are clinopyroxene-olivine-phyric basanites that contain augite, sodic-augite and aluminium augite. Kaersutite cumulate xenoliths host olivine, clinopyroxene including sodic-diopside, and calcic-amphibole, whereas an analysed leucogabbro xenolith hosts plagioclase, sodic-augite-diopside, calcic-amphibole and hauyne. Mineral thermobarometry and mineral-melt thermobarometry indicate that clinopyroxene and plagioclase in the 1971 Teneguía lavas crystallised at 20-45 km depth, coinciding with clinopyroxene and calcic-amphibole crystallisation in the kaersutite cumulate xenoliths at 25-45 km and clinopyroxene, calcic-amphibole and plagioclase crystallisation in the leucogabbro xenolith at 30-50 km. Combined mineral chemistry and thermobarometry suggest that the magmas had already crystallised, differentiated and formed multiple crystal populations in the oceanic lithospheric mantle. Notably, the magmas that supplied the 1949 and 1971 events appear to have crystallised deeper than the earlier Cumbre Vieja magmas, which suggests progressive underplating beneath the Cumbre Vieja rift zone. In addition, the lavas and xenoliths of the 1971 event crystallised at a common depth, indicating a reused plumbing system and progressive recycling of Ocean Island plutonic complexes during subsequent magmatic activity.

  15. Time Evolution of Deformation Using Time Series of Differential Interferograms: Application to La Palma Island (Canary Islands)

    NASA Astrophysics Data System (ADS)

    Perlock, Patricia A.; González, Pablo J.; Tiampo, Kristy F.; Rodríguez-Velasco, Gema; Samsonov, Sergey; Fernández, José

    2008-08-01

    Differential interferometry is a very powerful tool for detecting changes in the Earth’s crust where coherence conditions are good, but is difficult to employ in some volcanic areas due to dense vegetation. We apply two differential InSAR methods using the time series associated with the interferograms to perform a phase analysis on a data set for La Palma island (Canary Islands) from the ERS-1 and ERS-2 European Space Agency (ESA) satellites for the time period 1992 to 2000. Both methods involve choosing a master image from the database and creating a series of interferograms with respect to this image. The “Coherent Pixel Time Series” (CPTS) technique chooses pixels with good average coherence, aligns the unwrapped interferograms with a stable area and then performs an inversion to calculate the linear velocity to quantify the deformation. The Coherent Target Modeling (CTM) method calculates the temporal coherence of each pixel to identify stable targets and then determines the best velocity for each pixel by using a linear fit that maximizes the temporal coherence. Using these two methods we have been able to detect deformation on La Palma Island that has been previously undetectable by conventional InSAR methods. There is a roughly circular region on the Southern part of the island that is actively deforming at ~ -4 to -8 mm/yr. This region is located near the Teneguia valcano, the host of the last known eruption on La Palma in 1971. A thorough investigation of the possible sources for this deformation revealed that it was most likely created by a subsurface thermal source.

  16. Magma transport beneath La Palma: inferences based on fluid inclusion and mineral-melt thermobarometry

    NASA Astrophysics Data System (ADS)

    Galipp, K.; Kluegel, A.; Hansteen, T.

    2003-04-01

    La Palma (Canary Islands) represents a hotspot island with an active rift zone, inferred to have formed during the last 800 ka following southward growth of the former radial-symmetrical stratovolcano Taburiente /1/. The aim of our study is to model the magmatic evolution of the rift system from its early stage (Cumbre Nueva) through the short Bejenado volcano phase which followed the Cumbre Nueva collapse (560-549 ka) to the presently active rift zone (Cumbre Vieja). Clinopyroxene-melt thermobarometry and microthermometry of fluid inclusions were applied to constrain magma pathways and major levels of magma stagnation. CO2- dominated fluid inclusions in olivine and clinopyroxene in Taburiente picrites show density distributions with maxima at 0.7-0.85 g/cm-3. These values correspond to equilibrium pressures of 400-600 MPa, in accordance with other Taburiente data /2/. Inclusion data of a Cumbre Nueva ankaramite give pressure estimates of 200-300 MPa. In comparison, fluid inclusions in Recent Cumbre Vieja rocks yield a pronounced pressure estimate at 200-400 MPa, which overlaps with the Cumbre Nueva data but is shallower than that for Taburiente. Clinopyroxene-melt barometry of phenocryst rims and glassy groundmass yield pressure maxima between 600 and 900 MPa for Taburiente, Bejenado and Cumbre Nueva. This pressure range partly overlaps with that for Cumbre Vieja (maximum between 500 and 800 MPa) but has a tendency to higher pressures. The combined data indicate that two separate magma stagnation levels are distinct for each rift phase: (1) a main fractionation level within the upper mantle which is common to all phases, and (2) intermittent stagnation close to the Moho for the Taburiente volcano and above the Moho for both the Cumbre Nueva and Cumbre Vieja. Observing that the present rift system and the early stages of the rift show different levels of fractionation and magma stagnation and also show compositional differences between the lavas, we suggest that

  17. 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

  18. Carlsberg Meridian Catalogue, La Palma. Number 5. Observations of positions of stars and planets: May 1988 to December 1989.

    NASA Astrophysics Data System (ADS)

    This catalogue (CMC5) contains positions and magnitudes of 16693 stars north of declination -45°, 15004 proper motions, and 2847 positions and magnitudes of 66 solar system objects obtained with the Carlsberg Automatic Meridian Circle on La Palma during the period May 1988 to December 1989. The positions of the stars are for the epoch of observation and the equinox J2000.0, and are in a system close to that of the FK5. The limiting magnitude is mv = 14.8. The catalogue mainly comprises the following stars: 3883 International Reference Stars; 1158 faint reference stars in the fields of about 200 benchmark radio sources; 2271 G - K stars within 300 pc; 1234 A5 - G0 near the north galactic pole; 1242 stars from an unbiased sample of K - M dwarfs; and 1082 stars in nearby OB associations. The catalogue also contains observations of Callisto, Titan, Uranus, Neptune, Pluto and 61 minor planets. The mean error of a catalogue position in the zenith is 0″-07 in right ascension and declination, and 0m-04 in magnitude. The mean error of the proper motions, derived by combining the position in this catalogue with those at earlier epochs, is typically 0″-002 per year. Cross-references are given to DM, AGK, SAO, HD and the double star catalogues ADS and WDS.

  19. [Composition, abundance and infestation rate of ant species in a children's hospital in the city of Palmas, Tocantins, Brazil].

    PubMed

    Bragança, Marcos A L; Lima, Jefferson D

    2010-01-01

    This first survey of the ant fauna in a children's hospital in the city of Palmas, state of Tocantins, compares species composition, abundance and infestation rate of ants between rainy and dry seasons, day and night periods, and among 15 hospital sectors. Forty-eight collections, being 12 diurnal and 12 nocturnal in each season using five attractive baits distributed per sector, maintained for 3h per sampling. A total of 34,309 ants were collected, distributed in 12 species: Acromyrmex sp., Brachymyrmex sp., Camponotus spp. (four morphospecies), Dorymyrmex sp., Tetramorium sp., Solenopsis globularia (Creighton), Solenopsis saevissima Smith, Tapinoma melanocephalum (Fabricius) and Paratrechina longicornis (Latreille). The hospital presented an average building infestation rate (40.3%), when compared with hospitals from other Brazilian regions. In general, there was no difference in the species composition between seasons and the period of the day, although abundance of ants was higher at night. The dry season and the nocturnal period showed the highest infestation rate, mainly by T.melanocephalum and S.globularia. Gynecologic ward, lactation unit, preconception and pediatric ward access ramp showed higher infestation rate, although these varied between seasons. The significant infestation levels by the three species above, especially in sectors with restricted access such as lactation unit, laboratory, Intensive Care Unit e surgery center, indicate potential risks for contamination of patients by multi resistant pathogens possibly present in ants' bodies, as verified in others studies. PMID:20305908

  20. Dynamics and Plasma Diagnostics of Transition Region ``Moss'' using SOHO/CDS, TRACE and SVST (La Palma)

    NASA Astrophysics Data System (ADS)

    de Pontieu, B.; Berger, T. E.; Fletcher, L.; Schrijver, C. J.; Title, A. M.

    1999-05-01

    Recent observations of solar active regions with the Transition Region And Coronal Explorer (TRACE) have revealed finely textured, low-lying extreme ultraviolet (EUV) emission, called the ``moss'', appearing as a bright dynamic pattern with dark inclusions. The moss has been interpreted as the upper transition region by Berger et al., (1999). In this poster we study the physical conditions in the moss plasma, as well as its dynamics and connections to photosphere and chromosphere. Using simultaneous SOHO Coronal Diagnostic Spectrometer (CDS) and TRACE observations of Active Region (AR) 8227 on 30-May-1998 we determine the physical parameters of the moss material. We find T_e = 0.6-1.5 10(6) K and n_e = 2-5 10(9) cm(-3) at a temperature of 1.3 10(6) K. The pressure in the moss plasma is higher than that in coronal loops observed in the TRACE Fe IX/X 171 Angstroms passband, and moss emission is associated with high temperature loops, observed by SXT and by CDS in lines of T_max > 2.5 10(6) K. The volume filling factor of the moss plasma is of the order 0.1 and the path along which the emission originates is of the order 1,000 km long. We examine the dynamics of the moss plasma, by making comparisons of TRACE 171 Angstroms movies with SVST (La Palma) Ca II K-line, Hα , and G-band movies. Local Correlation Tracking (LCT) flowmapping techniques are used to establish the photospheric flowfield in plage regions with and without associated moss. The relation of moss emission to chromospheric spicules or fibrils is examined in detail using Hα movies and dopplergrams. In addition, several miniflare events occuring in plage regions are analyzed using TRACE and SVST movies. This research was supported by NASA contract NAS5-38099 (TRACE) and NASA SR&T grant NASW-98008.

  1. 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

  2. [Genetic diversity and kin relationships among wild and cultivated populations of the pejibaye palm (Bactris gasipaes, Palmae) using microsatellite markers].

    PubMed

    Ugalde, José Alfredo Hernández; Urpí, Jorge Mora; Nuñez, Oscar Rocha

    2008-03-01

    Genetic diversity and kin relationships among wild and cultivated populations of the pejibaye palm (Bactris gasipaes, Palmae) using microsatellite markers. The genetic diversity of the peach palm (Pejibaye, Bactris gasipaes Kunth) was evaluated using four nuclear DNA microsatellites in an effort to elucidate the evolution and domestication of this crop. A total of 258 samples from seven wild populations and eleven races were analyzed. All loci were polymorphic and a total of 50 alleles were identified. Average genetic diversity (0.67) and genetic differentiation among populations (Fst=0.16) were high when all populations were considered. Genetic differentiation was lower when the populations were grouped according to their origin into Western and Eastern populations (Fst=0.13 for both). Gene flow was slightly higher among Western populations (Nm=1.71) than among Eastern populations (Nm=1.62). The Putumayo, Yurimaguas, Vaupés, Tucurrique and Guatuso races seem to have been subjected to intense human selection. Hybrid populations exist in Azuero, Tuira, Cauca, Vaupés, Puerto Ayacucho and Solimões, probably resulting from exchange and introgressions among sympatric wild and cultivated populations. Genetic distance (Dm) was estimated to determine the degree of relationship among populations using the neighbor-joining method; the wild populations from Maracaibo were used as the outgroup. The populations were divided into three general groups: Maracaibo (B. caribaea, B. macana var veragua and B. macana var arapuey), Eastern Amazon (Tembe, Pará and Acre) and a third group with two subgroups, Western (Azuero, Chontilla, Tuira, Cauca, Tucurrique and Guatuso) and Upper Amazon (B. dahlgreniana, Puerto Ayacucho, Solimões, Vaupés and Putumayo). The genetic relationships strongly support the hypothesis that peach palm was brought into cultivation independently in no less than three areas: the Western Andes (extending into lower Central America); Upper Amazon (extending

  3. 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…

  4. Shallow fractionation signature of phase chemistry in Taburiente lavas, La Palma, Canary Islands: Results of MELTS modeling

    NASA Astrophysics Data System (ADS)

    Guetschow, H. A.; Nelson, B. K.

    2002-12-01

    Depth of crystal fractionation influences the chemical evolution of ocean island basalts and has significant implications for the physical structures of these volcanoes. In contrast to dominantly shallow systems such as Hawaii, a range of fractionation depths have been reported for Canary Islands lavas. Magmas erupted on La Palma preserve fluid- and melt-inclusion evidence for high-pressure (> 10 kbar) crystallization (Klügel et al., 1998; Hansteen et al., 1998; Nikogosian et al., 2002). If high-pressure fractional crystallization were an early and dominant process, it would generate specific patterns in rock and phase chemistry of eruptive sequences. Alkalic basalts from Taburiente volcano display coherent major element trends consistent with evolution dominated by fractional crystallization while their phenocryst compositions, trace elements, and isotopic trends require mixing between multiple sources. The current model confirms the importance of both fractionation and mixing to achieve the full range of lavas observed. A low-pressure (1 kbar) thermodynamic fractional crystallization model performed with the MELTS (Ghiorso and Sack, 1995) software closely reproduces major element trends from two stratigraphic sequences. This model also predicts the observed sequence of groundmass clinopyroxene compositions and phenocryst zoning reversals. In all low pressure simulations, olivine remains a modally significant liquidus phase during the first 20% and last 30% of the crystallization sequence, resulting in a negative correlation between the CaO and Fo content of olivine. These results are consistent with the presence of olivine phenocrysts that bear petrographic evidence of early crystallization, as well as observed compositional trends of groundmass olivine and clinopyroxene in Taburiente lavas. MELTS models that include an initial period of high pressure (12 kbar) clinopyroxene fractionation produce major element trends comparable to the low pressure model, but

  5. 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

  6. 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

  7. Carlsberg Meridian Catalogue, La Palma. Number 9. Observations of positions of stars and planets, May 1984 to March 1995 including extinction and meteorological data.

    NASA Astrophysics Data System (ADS)

    This catalogue (CMC9) contains 141593 positions and magnitudes of 138603 stars north of declination -40°, 117559 proper motions, and 19585 positions and magnitudes of 97 Solar System objects obtained with the Carlsberg Automatic Meridian Circle on La Palma during the period May 1984 to March 1995. CMC9 includes CMC1 to CMC8; i.e. it comprises all the observations made since the instrument began operation on La Palma. The positions of the stars are for the epoch of observation and the equinox J2000.0, and are referred to the new International Celestial Reference Frame. The original version of the catalogue with positions referred to a smoothed version of the FK5 is also given. The limiting magnitude is V = 15.4. The catalogue mainly comprises observations and proper motions for the following programmes: 36000 International Reference Stars, 30000 faint reference stars in a global net, 18000 reference stars in the fields of radio sources, 17000 stars in the Lick Northern Proper Motion catalogue, 5000 reference stars for calibration of Schmidt plates, 2600 stars in the Gliese catalogue of nearby stars, 5000 stars in nearby OB associations, 10500 F-type stars within 100 pc, 9000 G-type d&g, K-type g stars within 300 pc, 2200 unbiased sample of K/M-type d stars, 2200 reference stars near Veron-Cetty galaxies, 1050 variable stars (12 - 14 mag) in GCVS, 800 stars (11 - 14 mag) with pm > 0″-3/yr ion NLTT, and several smaller programmes mainly aimed at galactic kinematics. Positions and magnitudes of 8 novae and 7 supernovae which occurred in the years 1991 to 1995 are included. The catalogue also contains observations of the following Solar System objects: Callisto, Ganymede, Rhea, Titan, Iapetus, Hyperion, Uranus, Oberon, Neptune, Pluto and 87 minor planets. The mean error of a catalogue position in the zenith is 0″-09 in right ascension and declination in CMC4-5-6, improving to 0″-06 in CMC7-9. The accuracy in magnitude is 0.05 mag throughout. The mean error of the

  8. Carlsberg Meridian Catalogues, La Palma. Numbers 1 - 11, 1999. Observations of positions of stars and planets, May 1984 to May 1998 including extinction and meteorological data.

    NASA Astrophysics Data System (ADS)

    This composite catalogue contains 180812 positions and magnitudes of 176591 stars north of declination -40°, 155005 proper motions, and 25848 positions and magnitudes of 184 Solar System objects obtained with the Carlsberg Automatic Meridian Circle on La Palma during the period May 1984 to May 1998. It includes CMC1 - 11; i.e. it comprises all the observations made with the moving-slit micrometer since the instrument began operation on La Palma. The positions of the stars are for the epoch of observation and the equinox J2000.0, and are referred to the new International Celestial Reference Frame. The limiting magnitude is V = 15.4. The catalogue mainly comprises observations and proper motions for the following programmes: 36000 International Reference Stars, 30000 faint reference stars in a global net, 18000 reference stars in the fields of radio sources, 17000 stars in the Lick Northern Proper Motion catalogue, 5000 reference stars for calibration of Schmidt plates, 2600 stars in the Gliese catalogue of nearby stars, 5000 stars in nearby OB associations, 10500 F-type stars within 100 pc, 9000 G-type d&g, K-type g stars within 300 pc, 2200 unbiased sample of K/M-typed stars, 19400 reference stars near Veron-Cetty galaxies, 4700 variable stars (12 - 14 mag) in GCVS, 12400 stars (11 - 14 mag) with pm > 0″-18/yr in NLTT, and several smaller programmes mainly aimed at galactic kinematics. Positions and magnitudes of 12 novae and 8 supernovae which occurred in the years 1991 to 1998 are included. The catalogue also contains observations of the following Solar System objects: Callisto, Ganymede, Rhea, Titan, Iapetus, Hyperion, Uranus, Oberon, Neptune, Pluto and 173 minor planets and comet P/Wild 2. The mean error of a catalogue position in the zenith is 0-09 in right ascension and declination in CMC1 - 6, improving to 0-06 in CMC7 - 11. The accuracy in magnitude is 0.05 mag in CMC1 - 10, improving to 0.03 mag in CMC11. The mean error of the proper motions, derived by

  9. 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. PMID:14752556

  10. [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. PMID:24767461

  11. 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

  12. Geologic evolution of the Canarian Islands of Lanzarote, Fuerteventura, Gran Canaria and La Gomera and comparison of landslides at these islands with those at Tenerife, La Palma and El Hierro

    NASA Astrophysics Data System (ADS)

    Acosta, J.; Uchupi, E.; Muñoz, A.; Herranz, P.; Palomo, C.; Ballesteros, M.

    2003-03-01

    In this paper we discuss the results of a swath bathymetric investigation of the Canary archipelago offshore area. These new data indicate that volcanism is pervasive throughout the seafloor in the region, much more that would be suggested by the islands. We have mapped tens of volcanic edifices between Fuerteventura and Gran Canaria and offshore Tenerife, La Gomera, El Hierro and La Palma. Volcanic flows are present between Tenerife and La Gomera and salic necks dominate the eastern insular slope of La Gomera. This bathymetry also supports land geologic studies that indicate that the oceanic archipelago has acquired its present morphology in part by mass wasting, a consequence of the collapse of the volcanic edifices. In the younger islands, Tenerife, La Palma and El Hierro, the Quaternary (1.2 to 0.15 Ma) debris avalanches are readily recognizable and can be traced offshore for distances measured in tens of km. Off the older islands, Lanzarote, Fuerteventura, Gran Canaria and La Gomera (<20 to 3.5 Ma), the avalanches have been obscured by subsequent turbidity current deposition and erosion as well as hemipelagic processes. The failure offshore western Lanzarote is in the form of a ramp at the base of the insular slope bound on the seaward side by a scarp. Its size and the lack of evidence of rotation along its landwards side precludes the possibility that it is a slump. It probably represents a slide whose outer scarp is caused by break-up of the slide. Mounds on the ramp’s surface may represent post-displacement volcanic structures or exotic blocks transported to their present locations by the slide. The failures offshore Fuerteventura are so large that, although they occurred in the Miocene-Pliocene, exotic blocks displaced from upslope are still recognizable in the insular margin morphology. The Canary Island insular margin appears to be a creation of Miocene-Pliocene mass wasting and more recent turbidity current deposition and erosion, and hemilepagic

  13. 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.

  14. 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

  15. 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

  16. 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

  17. [Fatty acids contained in 4 pejibaye palm species, Bactris gasipaes (Palmae)].

    PubMed

    Fernández-Piedra, M; Blanco-Metzler, A; Mora-Urpí, J

    1995-01-01

    Cooked and uncooked samples from four pejibaye palm races were analyzed to determine the moisture content, ether extract and the content of six fatty acids (C16:0 to C18:3). There was an increase in moisture and a decrease in ether extract (p < 0.05) in the cooked samples in comparison with the uncooked ones. No significant differences were found in fatty acid content between cooked and uncooked samples, but there were differences (p < 0.05) among races concerning the content of four fatty acids. Pejibaye fat is mainly mono-unsaturated (45.6%) and has a low poly-unsaturated to saturated fatty acid ratio (0.5). The fatty acid profile of uncooked pejibaye samples was: oleic acid, 32.6 to 47.8%; palmitic acid, 30.5 to 40.3%; linoleic acid, 11.2 to 21.1%; palmitoleic acid, 5.7 to 7.1%; linoleic acid, 1.5 to 5.5%; and stearic acid, 1.7 to 2.4%. PMID:8728758

  18. Morphogenesis of the human palma arch using three-dimensional geometric modeling.

    PubMed

    Durand, Sebastien; Marin, Frederic; Oberlin, Christophe; Ho Ba Tho, Marie-Christine

    2011-10-01

    The hand goes through complex morphological modifications during embryogenesis. The goal of this study was to use geometric modeling to study the morphometric modifications of the palmar arch. Five embryos were used for the study (sizes: 15, 17, 23, 30, and 44 mm). After digitalization of histologic sections (Sony DXC-930P 3CCD camera, Leica Qwin) and segmentation of the metacarpal cartilaginous matrices (Winsurf 4.3 software), geometric modeling and calculations were performed using MSC.Patran 2005r2 software. Correlations (r > 0.99) were found between embryo size and metacarpal volume, metacarpal surface, and the surface of the modeled palmar arch. The growth of the palmar arch is nonhomothetic. Significant reduction (P = 0.05) in the divergence of the 2nd, 3rd, 4th, and 5th metacarpals was observed. Deepening of the palmar arch is correlated with embryo size and age (r > 0.99). Geometric modeling allows 3D rendering of histologic sections and thus quantitative description of the morphogenesis. The results of this study support the hypothesis that opposition of the thumb in correlation with deepening of the palmar arch appears early in embryological development. It constitutes a specific morphological characteristic that appears very early in the human phylum. The fact that the human thumb is naturally in opposition in the resting position is a consequence of this morphogenesis. The thumb's resting position has received little attention in clinical settings and should be considered as the reference position for biomechanical analysis of the thumb column. PMID:21538563

  19. 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.

  20. 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.

  1. 75 FR 25257 - Ocean Transportation Intermediary License Applicants

    Federal Register 2010, 2011, 2012, 2013, 2014

    2010-05-07

    ... Palma, CA 90623, Officers: Tony Lee, Vice President (Qualifying Individual), Haidong Zhang, President... Zhang, Secretary (Qualifying Individual), Yiwen Hu, President, Application Type: New OFF License....

  2. 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).

  3. Spectroscopic classification of 2MASS_J16211735+4412541

    NASA Astrophysics Data System (ADS)

    Scaringi, S.; Mason, E.; Van Winckel, H.; Escorza, A.

    2016-06-01

    We obtained a spectrum of the candidate short period binary 2MASS_J16211735+4412541 (CSS160603:162117+441254) with the high resolution HERMES spectrograph mounted on the 1.2m Mercator telescope on 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. 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.

  6. 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).

  7. 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).

  8. 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

  9. [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. PMID:24896050

  10. 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

  11. 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

  12. The Performance of a Depalma Roots-type Supercharger

    NASA Technical Reports Server (NTRS)

    Schey, Oscar W; Ellerbrock, Herman H , Jr

    1936-01-01

    The results of tests made to determine the performance of a DePalma-Roots supercharger are presented. The performance of the DePalma supercharger with atmospheric pressure at the discharge was compared with that of a hypothetical NACA Roots-type supercharger of the same displacement. The tests were conducted at speeds from 1,000 to 6,000 r.p.m. and at pressure differences from 0 to 15 inches of mercury. The variation in clearance between the impeller tips and the impeller housing was determined for the DePalma supercharger at a speed of 2,000 r.p.m. and for the NACA supercharger at speeds from 500 to 3,000 r.p.m. with the pressure differences for each supercharger varying form 0 to 15 inches of mercury. The results indicate that, if warping and growing of the metals of the case and impellers are neglected, the most uniform clearances can probably be maintained for all operating conditions when the case and impellers are constructed of metals that have the same coefficient of expansion. The results also show that the discharge and intake openings of this model of the DePalma supercharger are too small, which lowers the volumetric efficiency and impairs the performance at all speeds and pressure differences. At high pressure difference the volumetric efficiency of the DePalma supercharger is greater when the discharge pressure surpasses atmospheric pressure than when the discharge pressure is atmospheric.

  13. 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. PMID:20417204

  14. Comparative analysis of the impact of geological activity on the structural design of telescope facilities in the Canary Islands, Hawaii and Chile

    NASA Astrophysics Data System (ADS)

    Eff-Darwich, A.; García-Lorenzo, B.; Rodriguez-Losada, J. A.; de La Nuez, J.; Hernández-Gutiérrez, L. E.; Romero-Ruiz, M. C.

    2010-09-01

    An analysis of the impact of seismic and volcanic activity has been carried out at selected astronomical sites, namely the observatories of El Teide (Tenerife, Canary Islands), Roque de los Muchachos (La Palma, Canary Islands), Mauna Kea (Hawaii) and Paranal (Chile), and the candidate site of Cerro Ventarrones (Chile). Hazard associated with volcanic activity is low or negligible at all sites, whereas seismic hazard is very high in Chile and Hawaii. The lowest geological hazard in both seismic and volcanic activity is found at Roque de los Muchachos observatory, on the island of La Palma.

  15. 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/

  16. 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

  17. The 2ND Meeting on Hot Subdwarf Stars and Related Objects

    NASA Astrophysics Data System (ADS)

    Østensen, R. H.

    The second meeting dedicated to hot subdwarf stars held at Santa Cruz de la Palma on 2005 June 6--10 is described. 58 participants from all over the world were present. Proceedings of the meeting including 56 papers are published as two issues of the Baltic Astronomy journal (Vol. 15, Nos. 1 and 2, 2006).

  18. 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.

  19. 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.

  20. 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.

  1. 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.

  2. 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. ...

  3. 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).

  4. 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.

  5. 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.

  6. 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

  7. 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. ...

  8. 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).

  9. VizieR Online Data Catalog: riz photometry in Cyg OB2 (Guarcello+, 2012)

    NASA Astrophysics Data System (ADS)

    Guarcello, M. G.; Wright, N. J.; Drake, J. J.; Garcia-Alvarez, D.; Drew, J. E.; Aldcroft, T.; Kashyap, V. L.

    2012-11-01

    The observations were performed in the r', i', and z' filters with OSIRIS, mounted on the 10.4m Gran Telescopio CANARIAS (GTC) of the Spanish Observatorio del Roque de los Muchachos in La Palma, between 2009-09-11 and 2009-09-22. The scale on the detector is 0.127arcsec/pix (1 data file).

  10. VizieR Online Data Catalog: Homogeneous sample of F6-K4 Hyades stars (Tabernero+, 2012)

    NASA Astrophysics Data System (ADS)

    Tabernero, H. M.; Montes, D.; Gonzalez Hernandez, J. I.

    2012-10-01

    Spectroscopic observations were obtained at the 1.2m Mercator Telescope at the Observatorio del Roque de los Muchachos (La Palma, Spain) in January, May, and November 2010 with HERMES (High Efficiency and Resolution Mercator Echelle Spectrograph). ************************************************************************** * * * Sorry, but the author(s) never supplied all tabular material * * announced in the paper * * * ************************************************************************** (6 data files).

  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. 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).

  13. 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.

  14. 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…

  15. 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.

  16. 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.; Arnosio, J. M.

    2013-12-01

    In the Paraná Basin (southern and southeastern Brazil), the stratigraphy of the Paraná Magmatic Province (PMP) is composed of a thick (up to 1600 m) volcanic sequence formed by a succession of petrographically and geochemically distinct units of basic and acidic composition. The whole package may have been emplaced in approximately 3 million yr of almost uninterrupted activity. A few aeolian sandstone layers, indicating arid environmental conditions (Botucatu Formation), are interlayered in the lower basalts. Above the basalts, the Palmas and Chapecó Members of the Early Cretaceous Serra Geral Formation, are composed of silicic volcanic rocks (trachydacites, dacites, rhyolites, and rhyodacites) and basalts. This paper presents new evidence of episodes of sedimentation separating silicic volcanic events, expressed by occurrences 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 Chapecó type rocks and underlying basaltic flows, between silicic bodies of Palmas and Chapecó types, and interlayered with 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.

  17. 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…

  18. 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...

  19. 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.

  20. 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. ...

  1. 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 ...

  2. 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

  3. X-ray and Optical follow-up of the mid-2014 Outburst of Aql X-1 at peak and at low activity

    NASA Astrophysics Data System (ADS)

    Gandhi, Poshak; Dhillon, Vik S.; Tomsick, John A.; Butterley, Tim; Littlefair, Stuart M.; Wilson, Richard W.; Kennea, Jamie A.

    2014-09-01

    Following reports of optical and X-ray brightening of the soft X-ray transient Aql X-1 (ATel #6280, #6286), we obtained monitoring observations of the source with the Swift X-ray mission, and with the 0.5 m Durham/Sheffield robotic optical telescope located on La Palma.

  4. Whose Development? Salvaging the Concept of Development within a Sociocultural Approach to Education

    ERIC Educational Resources Information Center

    Matusov, Eugene; DePalma, Renee; Drye, Stephanie

    2007-01-01

    The concept of development is currently under revision in education and psychology. In this essay, Eugene Matusov, Renee DePalma, and Stephanie Drye examine a traditional notion of development and provide an alternative sociocultural view. As educators working within a sociocultural approach to learning, development, and education, the authors see…

  5. Italian-American Traditions: Family and Community. An Exhibition in the Museum of the Balch Institute for Ethnic Studies.

    ERIC Educational Resources Information Center

    Balch Inst., Philadelphia, PA.

    Italian-Americans such as industrialist Lee Iacocca, architect Robert Venturi, film-maker Brian De Palma, and writer Gay Talese have contributed to the emergence of ethnic groups as a major force in the cultural and business life of the United States. What is not widely appreciated, however, is the cultural, religious, craft, and family base which…

  6. 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

  7. 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.

  8. 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

  9. 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. PMID:26560985

  10. 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. PMID:22664419

  11. Ecological aspects of Rhodnius nasutus Stål, 1859 (Hemiptera: Reduviidae: Triatominae) in palms of the Chapada do Araripe in Ceará, Brazil.

    PubMed

    Dias, Fernando Braga Stehling; Bezerra, Cláudia Mendonça; Machado, Evandro Marques de Menezes; Casanova, Cláudio; Diotaiuti, Liléia

    2008-12-01

    The aim of this work is to present aspects related to the ecology of Rhodnius nasutus Stål, 1859 in palms from Chapada do Araripe in Ceará, Brazil. The following five species of palms were investigated: babaçu (Attalea speciosa), buriti (Mauritia flexuosa), carnaúba (Copernicia prunifera), catolé (Syagrus oleracea) and macaúba-barriguda (Acrocomia intumescens). Fifth palms were dissected (10 specimens for each species). The overall infestation index was 86%, with a total of 521 triatomines collected. The Trypanosoma cruzi Chagas, 1909 Index was 16.8% and two insects presented mixed infection with Trypanosoma rangeli Tejera, 1920. A precipitin test showed that R. nasutus from palms of Chapada do Araripe are associated with opossum and bird although other possible bloodmeals were observed. Our results showing a high index of infestation of the palms as well as T. cruzi infection, the association of R. nasutus with the most diverse species of palms and proximity of these palms to houses demonstrate the importance of this area for sylvatic T. cruzi transmission and suggest the need for epidemiological surveillance in the region of the Chapada do Araripe. PMID:19148424

  12. 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

  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. PMID:21212205

  14. 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

  15. 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. PMID:26728765

  16. 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. PMID:25830543

  17. 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.

  18. HERMES at Mercator, competitive high-resolution spectroscopy with a small telescope

    NASA Astrophysics Data System (ADS)

    Raskin , G.; Van Winckel, H.

    2014-01-01

    HERMES, a fibre-fed high-resolution (R = 85 000) échelle spectrograph with good stability and excellent throughput, is the work-horse instrument of the 1.2-m Mercator telescope on La Palma. HERMES targets building up time series of high-quality data of variable stellar phenomena, mainly for asteroseismology and binary-evolution research. In this paper we present the HERMES project and discuss the instrument design, performance, and a future upgrade. We also present some results of the first four years of HERMES observations. We illustrate the value of small telescopes, equipped with efficient instrumentation, for high-resolution spectroscopy. 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. 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).

  20. Palynology and palaeoenvironment of the Quseir Formation (Campanian) from central Egypt

    NASA Astrophysics Data System (ADS)

    Mahmoud, Magdy S.

    2003-04-01

    The palynofloras of the basal part of the Quseir Formation in the Bulaq area, central Egypt, are overwhelmingly of terrestrial origin. They are dominated by angiosperms (mainly Foveotricolpites and Arecipites). Pteridophytic spores are abundant, amongest which the Deltoidospora/Cyathidites association and Gabonisporis vigourouxii are the most frequent. Aquatic plants (e.g. Ariadnaesporites spores) and freshwater algae (e.g. Ovoidites and Pediastrum) occur in appreciable amounts. The association is indicative of a fluvio-lacustrine environment characterized by widespread moist and aquatic habitats under a warm-humid (tropical) palaeoclimate. An angiosperm-based dating as Campanian (most probably Early Campanian) is suggested. Proteacidites sp. 3 Lawal and Moullade and Syncolporites schrankii Awad are the most significant angiosperms, which are not known to range before the Campanian in the "Senonian Palmae Province" areas. The Bulaq assemblages bear a close relationship with the Palmae palynofloras of North Africa, but differ significantly from those of West Africa.

  1. (Inter-),Network Structure and DynamicS

    NASA Astrophysics Data System (ADS)

    Rutten, R. J.

    1999-09-01

    The dynamical nature of the low solar atmosphere outside active regions is emphasized by recent observations and simulations alike. La Palma images, MDI maps, SUMER spectra, TRACE movies, hydrodynamic shock simulations and magnetohydrodynamic sheet simulations all impart non-quiet behavior to the "quiet Sun". This review begins with a brief summary of current insights and then focuses on various quiet-Sun questions that seem pertinent and solvable.

  2. BOOTES and GTC observations of cosmic gamma-ray bursts and their progenitors

    NASA Astrophysics Data System (ADS)

    Castro-Tirado, Alberto J.

    2016-07-01

    We will summarize the follow-up observations of gamma-ray bursts performed worldwide by the BOOTES Network of robotic telescopes (with some of the data being contemporaneous to the prompt emission) leading to the discovery of many afterglows. Complementary data has been also obtained by the 10.4m GTC telescope in La Palma (mainly spectroscopy), with one of them being the highest extinguished afterglow detected to date.

  3. VizieR Online Data Catalog: 72 WINGS nearby clusters luminosity functions (Moretti+, 2015)

    NASA Astrophysics Data System (ADS)

    Moretti, A.; Bettoni, D.; Poggianti, B. M.; Fasano, G.; Varela, J.; D'Onofrio, M.; Vulcani, B.; Cava, A.; Fritz, J.; Couch, W. J.; Moles, M.; Kjaergaard, P.

    2015-11-01

    We used the Sextractor photometric catalogue of WINGS galaxies described in Varela et al. (2009A&A...497..667V, Cat. J/A+A/497/667), which refers to optical (B,V) photometry of 76 cluster of galaxies, either observed with the INT telescope at La Palma, or with the 2.2m ESO telescope at La Silla. (1 data file).

  4. 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).

  5. 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).

  6. 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).

  7. 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.

  8. VizieR Online Data Catalog: Polarization at high galactic latitude (Berdyugin+, 2014)

    NASA Astrophysics Data System (ADS)

    Berdyugin, A.; Piirola, V.; Teerikorpi, P.

    2013-11-01

    Polarization data for 2400 stars measured with the DiPol-1 and DiPol-2 CCD polarimeters at the 60cm KVA remote-controled telescope at La Palma (Canary Islands, Spain) are presented. For each star the star number (either from HD or BD catalogs), galactic coordinates (l, b), measured polarization (in percents), error of polarization, polarization angle (in degrees), error of polarization angle, and the parallax (in mas) are given. (1 data file).

  9. 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.

  10. 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.

  11. A study of the new hemispherical 6-dynodes PMT from electron tubes

    NASA Astrophysics Data System (ADS)

    Ostankov, A.; Paneque, D.; Lorenz, E.; Martinez, M.; Mirzoyan, R.

    2000-03-01

    The main electro-optical properties of the new fast and low-gain hemispherical PMT from Electron Tubes Ltd. have been studied. This PMT is considered as photosensor for the camera of the 17 m diameter air Cherenkov telescope MAGIC to be installed in two years at Canary Island La Palma. The dependence of the single-electron resolution and afterpulse rates as well as linearity on the interdynode voltages have been studied in detail.

  12. 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).

  13. VizieR Online Data Catalog: Radial velocity monitoring of PG 1018-047 (Deca+, 2012)

    NASA Astrophysics Data System (ADS)

    Deca, J.; Marsh, T. R.; Ostensen, R. H.; Morales-Rueda, L.; Copperwheat, C. M.; Wade, R. A.; Stark, M. A.; Maxted, P. F. L.; Nelemans, G.; Heber, U.

    2013-03-01

    We have observed PG 1018-047 spectroscopically with several different instrument setups over a period of 10yr. The data were obtained using the Isaac Newton Telescope (INT), William Herschel Telescope (WHT) and Nordic Optical Telescope (NOT) on the island of La Palma, the Radcliffe telescope at the South African Astronomical Observatory (SAAO) and the Hobby-Eberly Telescope (HET) located at the McDonald Observatory in Texas. (3 data files).

  14. Bd +60 73 = Igr J00370+6122

    NASA Astrophysics Data System (ADS)

    Negueruela, Ignacio; Reig, Pablo

    2004-05-01

    A classification spectrum of BD +60 73, reported to be the optical counterpart to IGR J00370+6122 (ATel #281), was taken on the night of 2003 July 7th with the 2.5-m Issac Newton telescope at La Palma. The derived spectral type is BN0.5II-III, where the composite luminosity class indicates an intermediate luminosity. The Nitrogen enhancement is moderately high, with numerous NII lines being rather stronger than corresponds to the spectral type.

  15. Metallic content of wines from the Canary Islands (Spain). Application of artificial neural networks to the data analysis.

    PubMed

    Frías, Sergio; Conde, José E; Rodríguez, Miguel A; Dohnal, Vlasta; Pérez-Trujillo, Juan P

    2002-10-01

    Eleven elements, K, Na, Ca, Mg, Fe, Cu, Zn, Mn, Sr, Li and Rb, were determined in dry and sweet wines bearing the denominations of origin of El Hierro, La Palma and Lanzarote islands (Canary Islands, Spain). Analyses were performed by flame atomic absorption spectrophotometry, with the exceptions of Li and Rb for which flame atomic emission spectrophotometry was used. The content in copper and iron did not present risks of cases. All samples presented a copper and zinc content below the maximum amount recommended by the Office International de la Vigne et du Vin (OIV) for these elements. Significant differences in the metallic content were found among the different islands. Thus, Lanzarote presented the highest mean content in sodium and lithium and the lowest mean content in rubidium, and La Palma presented the highest mean content in strontium and rubidium. Sweet wines from La Palma, elaborated as naturally sweet with over-ripe grapes, presented mean contents significantly higher with regard to dry wines from the same island in the majority of the analysed elements. Cluster analysis and Kohonen self-organising maps showed differences in wines according to the island of origin and the ripening state of the grapes. Back-propagation artificial neural networks showed better prediction ability than stepwise linear discriminant analysis. PMID:12428457

  16. Classification of commercial wines from the Canary Islands (Spain) by chemometric techniques using metallic contents.

    PubMed

    Frías, Sergio; Conde, José E; Rodríguez-Bencomo, Juan J; García-Montelongo, Francisco; Pérez-Trujillo, Juan P

    2003-02-01

    Eleven elements, K, Na, Ca, Mg, Fe, Cu, Zn, Mn, Sr, Li and Rb, were determined in dry and sweet wines bearing the denominations of origin of El Hierro, La Palma and Lanzarote islands (Canary Islands, Spain). Analyses were performed by flame atomic absorption spectrophotometry, with the exceptions of lithium and rubidium for which flame atomic emission spectrophotometry was used. Sweet wines from La Palma were elaborated as naturally sweet with over-ripe grapes and significant differences were found in all the analysed elements with the exceptions of sodium, iron and rubidium with regard to dry wines from the same island. Contrarily, sweet wines from Lanzarote elaborated with grapes in a similar ripening state to dry wines did not present significant differences between them with the exception of strontium, the content of which was greater in dry wines. Among the three islands, significant differences in mean content were found with the exceptions of iron and copper. Cluster analysis and principal component analysis show differences in wines according to the island of origin and the ripening state of the grapes. Linear discriminant analysis using rubidium, sodium, manganese and strontium, the four most discriminant elements, gave 100% recognition ability and 95.6% prediction ability. The sensitivity and specificity obtained using soft independent modelling of class analogy (SIMCA) as a modelling multivariate technique were both 100% for El Hierro and Lanzarote, and 100 and 95%, respectively, for La Palma. The modelling and discriminant capacities of the different metals were also studied. PMID:18968916

  17. 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).

  18. 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.

  19. Influence of the palm tree species on the variability of Rhodnius nasutus Stål, 1859 (Hemiptera, Reduviidae, Triatominae).

    PubMed

    Dias, Fernando Braga Stehling; Paula, Alexandre Silva de; Belisário, Carlota Josefovicz; Lorenzo, Marcelo Gustavo; Bezerra, Cláudia Mendonça; Harry, Myriam; Diotaiuti, Liléia

    2011-07-01

    This work evaluated the occurrence and genetic structure of Rhodnius nasutus sampled in two sites using morphometry and microsatellites. These sites, presented distinct abiotic features and palm trees: (i) nine Attalea speciosa palm trees, so called babaçu, were sampled from the Meruoca Mountain Ridge, a sloping region of reminiscent forest in the state of Ceará, Brazil, and (ii) 17 Copernicia prunifera palm trees, so called carnaúba, were sampled in the scrub savanna region (Sobral district) that surrounds the mountain ridge. Of the twenty-six palm trees dissected, 70.6% of carnauba and 88.9% of babaçu were infested by R. nasutus. The micro-climatic data where R. nasutus were sheltered demonstrated that the babaçu and carnaúba palm trees presented significant differences (p < 0.05) in relation to the external environment, except for temperature and relative humidity regulation, suggesting that the architecture of the babaçu crown keeps a more stable micro-environment. The morphometric studies of the F1 generation demonstrated that insects from the babaçu (A. speciosa) were significantly larger (p = 0.000) than those collected in carnaúba (C. prunifera) palm trees. Also, microsatellite analysis demonstrated a high genetic differentiation between the two groups of R. nasutus (R(st) = -0.77). Our results suggest that the difference in size between the populations is probably related to an incipient process of genetic drift in populations associated to each palm tree, probably also driven by the different climatic features observed in these micro-environments. PMID:21335104

  20. Systematic screening of plant extracts from the Brazilian Pantanal with antimicrobial activity against bacteria with cariogenic relevance.

    PubMed

    Brighenti, F L; Salvador, M J; Delbem, Alberto Carlos Botazzo; Delbem, Ádina Cleia Bottazzo; Oliveira, M A C; Soares, C P; Freitas, L S F; Koga-Ito, C Y

    2014-01-01

    This study proposes a bioprospection methodology regarding the antimicrobial potential of plant extracts against bacteria with cariogenic relevance. Sixty extracts were obtained from ten plants--(1) Jatropha weddelliana, (2) Attalea phalerata, (3) Buchenavia tomentosa, (4) Croton doctoris, (5) Mouriri elliptica, (6) Mascagnia benthamiana, (7) Senna aculeata, (8) Unonopsis guatterioides, (9) Allagoptera leucocalyx and (10) Bactris glaucescens--using different extraction methods - (A) 70° ethanol 72 h/25°C, (B) water 5 min/100°C, (C) water 1 h/55°C, (D) water 72 h/25°C, (E) hexane 72 h/25°C and (F) 90° ethanol 72 h/25°C. The plants were screened for antibacterial activity at 50 mg/ml using the agar well diffusion test against Actinomyces naeslundii ATCC 19039, Lactobacillus acidophilus ATCC 4356, Streptococcus gordonii ATCC 10558, Streptococcus mutans ATCC 35688, Streptococcus sanguinis ATCC 10556, Streptococcus sobrinus ATCC 33478 and Streptococcus mitis ATCC 9811. The active extracts were tested to determine their minimum inhibitory concentration (MIC), minimum bactericidal concentration (MBC), cytotoxicity and chemical characterization. Forty-seven extracts (78%) were active against at least one microorganism. Extract 4A demonstrated the lowest MIC and MBC for all microorganisms except S. gordonii and the extract at MIC concentration was non-cytotoxic. The concentrated extracts were slightly cytotoxic. Electrospray ionization with tandem mass spectrometry analyses demonstrated that the extract constituents coincided with the mass of the terpenoids and phenolics. Overall, the best results were obtained for extraction methods A, B and C. The present work proved the antimicrobial activity of several plants. Particularly, extracts from C. doctoris were the most active against bacteria involved in dental caries disease. PMID:24603299

  1. 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

  2. Resonance interaction between Bays and Harbors forced by tsunamis

    NASA Astrophysics Data System (ADS)

    Vela, Jordi; Pérez, Begoña.; González, Mauricio; Otero, Luis; Olabarrieta, Maitane; Canals, Miquel

    2010-05-01

    The tsunami induced by the 21 May 2003 Boumerdès-Zemmouri (Algeria) earthquake (Mw=6.9) did not generated important inundations damages or fatalities in the western Mediterranean area. However, damages and economic losses were reported in some harbors, generated by important sea level disturbances. Noticeable impacts were noted (broken mooring lines, sunken boats, displaced moorings, etc.) in some harbours in the Balearic Islands (Palma de Majorca, Ibiza and San Antoni) and also along the French border (La Figueirette and Mouré-Rouge harbours). Various authors have attempted to simulate this event finding discrepancies between the tsunami arrival time and amplitudes of waves on the tide gauges and results with numerical models. The models underestimate the amplitude of the tsunami. In some cases the underestimations have been associated to numerical limitations due to the lack of a high-resolution bathymetry and poor harbor geometry definition. Other cases, associated to a non appropriate seismic source characterization. Finally, some authors point out the occurrence of one or several submarine landslides triggered by the earthquake simultaneously with the seafloor vertical displacement, which have not been included in the numerical simulations. For a better knowledge of the response of a harbour interacting with a bay forced by a tsunami, a numerical study has been carried out for Palma Bay and Palma de Majorca Harbour. The transference of energy of the tsunami from the generation area to the continental shelf, the bay and the harbour has been studied for the Algerian tsunami (21 May 2003) and compared with the natural oscillation modes of the bay and the harbour water bodies. Furthermore, a sensibility analysis regarding the influence of the grid size of the harbour and bay bathymetries was also performed to understand the discrepancies between simulations and observations. The 2003 Zemmouri tsunami measured by the tidal gauge of Palma habour showed energy

  3. 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).

  4. 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.

  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. VizieR Online Data Catalog: Detections of transit variations in KOI 806 (Tingley+, 2011)

    NASA Astrophysics Data System (ADS)

    Tingley, B.; Palle, E.; Parviainen, H.; Deeg, H. J.; Zapatero Osorio, M. R.; Cabrera-Lavers, A.; Belmonte, J. A.; Montanes Rodriguez, P.; Murgas, F.; Ribas, I.

    2011-11-01

    g' and z' photometric time series for the last ~1.6hrs of the transit of KOI 806.2 observed with the Gran Telescopio Canarias at Observatorio del Roque de los Muchachos on the island of La Palma, Spain. The observations occurred on JD 2455740, revealing a transit timing variation of -103.5+/-6.9 minutes. The raw fits files were bias and flat field corrected using IRAF and the differential photometry determined using the VAPHOT/Vanaliz package (Deeg & Doyle 2001, 2001phot.work...85D). (2 data files).

  7. Binarity among C-enriched and Related Stars

    NASA Astrophysics Data System (ADS)

    Van Eck, S.; Merle, T.; Jorissen, A.; Van Winckel, H.; Gorlova, N.; Vos, J.; Exter, K.; Oestensen, R.; Van de Steene, G.

    2015-08-01

    Long-term radial-velocity monitoring of different families of evolved stars is being carried out with the high-resolution HERMES spectrograph mounted on the MERCATOR telescope (La Palma, Spain). Here we report on new binary AGB star candidates as well as new binary CH stars. The AGB-manqué channel is also discussed and is needed to explain binary systems with helium white dwarfs. Determining the orbital parameters of these families of binary stars is essential to constrain not only the mass-transfer mechanisms, but also RGB and AGB evolution.

  8. Astronomical Site Characterization at the Canarian Observatories

    NASA Astrophysics Data System (ADS)

    Muñoz-Tuñón, C.; Varela, A. M.; Castro-Almazán, J. A.

    2015-04-01

    Roque de los Muchachos Observatory (La Palma) and Teide Observatory (Tenerife) are prime astronomical sites, as confirmed by more than 30 years of intensive site-testing campaigns. The IAC has long been aware of the importance of promoting initiatives for the characterization and protection of the Canarian Observatories. For this purpose, in the late ’80s a Sky Team was created to measure the atmospheric parameters relating to astronomical observations, to design and develop new instruments and techniques for astronomical site testing, and to improve and maintain a high level of instrumentation in site characterization. New instruments and techniques are welcomed by the Observatories.

  9. Monitoring of geological activity on astronomical sites of the Canary Islands, Hawaii, and Chile

    NASA Astrophysics Data System (ADS)

    Eff-Darwich, Antonio; Garcia-Lorenzo, Begoña; Rodriguez-Losada, Jose A.; Hernández-Gutiérrez, Luis E.; de la Nuez, Julio; Romero-Ruiz, Maria C.

    2009-09-01

    Future large and extremely large ground-based telescopes will demand stable geological settings.Remote sensing could be an unvaluable tool to analyse the impact of geological activity at selected astronomical sites, namely the observatories of El Teide (Tenerife, Canary Islands), Roque de los Muchachos (La Palma, Canary Islands), Mauna Kea (Hawaii) and Paranal (Chile; the candidate site of Cerro Ventarrones, Chile). In this sense, the extent of lava flows, eruptive clouds or ground deformation associated to seismic and/or volcanic activity could be analysed and characterised through remote sensing.

  10. 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.

  11. 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).

  12. 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).

  13. 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).

  14. 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.

  15. 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).

  16. Division VI Working Groups

    NASA Astrophysics Data System (ADS)

    2010-05-01

    During the last business meeting of the WG on PN during the GA09, several topics were addressed. The renovation of the WG members was discussed. We agreed that members will be renewed during the PN IAU symposiums, and that the maximum duration of the term will be 10 years. It was decided that the next IAU PN Symp will be held in Puerto de la Cruz, Tenerife, in 2011. It seemed appropriate to hold the symposium in the Canary Islands in recognition of the new 10.4m GTC telescope recently inaugurated on La Palma and its importance to the field of planetary nebulae.

  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. Optical confirmation of iPTF13ebh as a young Type Ia supernova

    NASA Astrophysics Data System (ADS)

    Maguire, K.; Sullivan, M.; Nugent, P.

    2013-11-01

    We report that an optical spectrum (range 490-950 nm) obtained on Nov 15.8 UT with the William Herschel Telescope, La Palma using the Auxiliary-port Camera (ACAM), confirms that iPTF13ebh (ATEL #5580) is a young Type Ia supernova. Using 'superfit' (Howell et al. 2005), the spectrum was found to be most similar to SN 1994d at -8 days. Adopting a redshift of 0.013269 for the host galaxy, NGC 890 (from NED), we estimate the Si II 6150 feature has a minimum at ~13000 km/s.

  19. Seyfert's Sextet (HGC 79): An Evolved Stephan's Quintet?

    NASA Astrophysics Data System (ADS)

    Durbala, A.; Sulentic, J.; Rosado, M.; Del Olmo, A.; Perea, J.; Plana, H.

    Scanning Fabry-Perot interferometers MOS/SIS (3.6m CFHT)+PUMA (2.1m OAN-SPM, México) and the long-slit spectrograph ALFOSC (2.5m NOT, La Palma) were used to measure the kinematics of gas and stars in Seyfert's Sextet (HCG79). We interpret it as a highly evolved group that formed from sequential acquistion of mostly late-type galaxies that are now slowly coalescing and undergoing strong secular evolution. We find evidence for possible feedback as revealed by accretion and minor merger events in two of the most evolved members.

  20. Broad and narrow band imaging and spectroscopic follow up of SN2014J in M82

    NASA Astrophysics Data System (ADS)

    Moreno-Raya, Manuel E.; Galbany, Lluis; Lopez-Sanchez, Angel R.; Dominguez, Inma; Vilchez, Jose M.; Carnero, Aurelio; Molla, Mercedes

    2014-01-01

    The supernova SN2014J in the starburst galaxy M82 was observed using the 4.2m WHT in La Palma. Low, intermediate and high resolution spectroscopy with ISIS and ACAM and broadband (u, g, r, i, z) and Halpha imaging were obtained everynight from 23rd to 26th January. Low and intermediate resolution spectra were obtained covering the whole optical range (3500 A to 9400 A approx.), plus High resolution spectra (0.23 A/pix dispersion) centered at 3950 A in the blue and at 5890 A in the red.

  1. 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).

  2. 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.

  3. Finite element simulation of a local scale air quality model over complex terrain

    NASA Astrophysics Data System (ADS)

    Oliver, A.; Montero, G.; Montenegro, R.; Rodríguez, E.; Escobar, J. M.; Perez-Foguet, A.

    2012-05-01

    In this paper we propose a finite element method approach for modelling the air quality in a local scale over complex terrain. The area of interest is up to tens of kilometres and it includes pollutant sources. The proposed methodology involves the generation of an adaptive tetrahedral mesh, the computation of an ambient wind field, the inclusion of the plume rise effect in the wind field, and the simulation of transport and reaction of pollutants. We apply our methodology to simulate a fictitious pollution episode in La Palma island (Canary Island, Spain).

  4. 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.

  5. The Angstrom Project: M31 microlensing alert ANG-08B-M31-07

    NASA Astrophysics Data System (ADS)

    Darnley, M. J.; Kerins, E.; Newsam, A. M.; Duke, J. P.; Gould, A.; Street, C. Han B.-G. Park R. A.

    2008-12-01

    We report an ongoing microlensing candidate in M31 by the Angstrom Project M31 bulge microlensing survey using the Liverpool Telescope (La Palma). The candidate was detected from difference imaging photometry generated by the Angstrom Project Alert System (APAS) in a series of Sloan i'-band images of the bulge of M31.

  6. The Angstrom Project: two new microlensing/nova transients

    NASA Astrophysics Data System (ADS)

    Kerins, Eamonn

    2008-11-01

    We report the discovery of two new optical transients in M31 by the Angstrom Project M31 bulge microlensing survey using the Liverpool Telescope (La Palma). These transients were discovered using difference imaging techniques by the Angstrom Project Alert System (APAS) in a series of Sloan i'-band images of the bulge of M31.

  7. The Angstrom Project: a new microlensing candidate

    NASA Astrophysics Data System (ADS)

    Kerins, E.; Darnley, M. J.; Newsam, A. M.; Duke, J. P.; Gould, A.; Street, C. Han B.-G. Park R. A.

    2008-12-01

    We report the discovery of a new microlensing candidate in M31 by the Angstrom Project M31 bulge microlensing survey using the Liverpool Telescope (La Palma). The candidate was discovered using difference imaging techniques by the Angstrom Project Alert System (APAS) in a series of Sloan i'-band images of the bulge of M31.

  8. 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.

  9. The future of ELTs (extremely large telescopes): a very personal view

    NASA Astrophysics Data System (ADS)

    Mountain, C. Matt

    2004-07-01

    "The Future of ELTs" is an intriguing as well as daunting title. But this is not about telescopes. After all, what could top visions of telescopes ranging from a "mere" 20 meters, to 100 meters, to plastic 30-meter telescopes in space, to new telescopes for the Moon and even a "hyper-telescope" designed to fill the volcanic crater on La Palma? Instead, this is about an equally interesting subject: Advanced Telescope Builders of the Early 21st Century, which reflects on the gathering of unique individuals that Arne Ardeberg and the University of Lund have so graciously brought together at this workshop.

  10. 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).

  11. S-Cam 3: Optical astronomy with a STJ-based imaging spectrophotometer

    NASA Astrophysics Data System (ADS)

    Verhoeve, P.; Martin, D. D. E.; Hijmering, R. A.; Verveer, J.; van Dordrecht, A.; Sirbi, G.; Oosterbroek, T.; Peacock, A.

    2006-04-01

    S-Cam 3 is the third generation of a cryogenic camera, based on superconducting tunnel junctions (STJs), for ground-based optical astronomy, deployed at the 4.2 m William Herschel Telescope (WHT) at La Palma (Spain). It exploits a 10×12 pixel array of Ta/Al STJs, covering a field of view of ˜9″×11″ on the sky. The wavelength band extends from 330 750 nm, with a wavelength resolving power of ˜10 at 500 nm. The detectors are operated at ˜285 mK, achieved with a double stage 4He 3He sorption cooler. Each pixel has its own electronic readout chain at room temperature, with a JFET-based charge sensitive preamplifier. The instrument has undergone extensive testing and calibration, followed by the first observation campaign at La Palma in July 2004. This campaign has focused on point sources with time variability, exploiting the instrument's unique combination of spectrophotometry with high time resolution.

  12. Diversity of acetic acid bacteria present in healthy grapes from the Canary Islands.

    PubMed

    Valera, Maria José; Laich, Federico; González, Sara S; Torija, Maria Jesús; Mateo, Estibaliz; Mas, Albert

    2011-11-15

    The identification of acetic acid bacteria (AAB) from sound grapes from the Canary Islands is reported in the present study. No direct recovery of bacteria was possible in the most commonly used medium, so microvinifications were performed on grapes from Tenerife, La Palma and Lanzarote islands. Up to 396 AAB were isolated from those microvinifications and identified by 16S rRNA gene sequencing and phylogenetic analysis. With this method, Acetobacter pasteurianus, Acetobacter tropicalis, Gluconobacter japonicus and Gluconacetobacter saccharivorans were identified. However, no discrimination between the closely related species Acetobacter malorum and Acetobacter cerevisiae was possible. As previously described, 16S-23S rRNA gene internal transcribed spacer (ITS) region phylogenetic analysis was required to classify isolates as one of those species. These two species were the most frequently occurring, accounting for more than 60% of the isolates. For typing the AAB isolates, both the Enterobacterial Repetitive Intergenic Consensus (ERIC)-PCR and (GTG)5-PCR techniques gave similar resolution. A total of 60 profiles were identified. Thirteen of these profiles were found in more than one vineyard, and only one profile was found on two different islands (Tenerife and La Palma). PMID:21903289

  13. Three photometric methods tested on ground-based data of Q 2237+0305

    NASA Astrophysics Data System (ADS)

    Burud, I.; Stabell, R.; Magain, P.; Courbin, F.; Ostensen, R.; Refsdal, S.; Remy, M.; Teuber, J.

    1998-11-01

    The Einstein Cross, Q 2237+0305, has been photometrically observed in four bands on two successive nights at NOT (La Palma, Spain) in October 1995. Three independent algorithms have been used to analyse the data: an automatic image decomposition technique, a CLEAN algorithm and the new MCS deconvolution code. The photometric and astrometric results obtained with the three methods are presented. No photometric variations were found in the four quasar images. Comparison of the photometry from the three techniques shows that both systematic and random errors affect each method. When the seeing is worse than 1farcs0 , the errors from the automatic image decomposition technique and the Clean algorithm tend to be large (0.04-0.1 magnitudes) while the deconvolution code still gives accurate results (1sigma error below 0.04) even for frames with seeing as bad as 1farcs7 . Reddening is observed in the quasar images and is found to be compatible with either extinction from the lensing galaxy or colour dependent microlensing. The photometric accuracy depends on the light distribution used to model the lensing galaxy. In particular, using a numerical galaxy model, as done with the MCS algorithm, makes the method less seeing dependent. Another advantage of using a numerical model is that eventual non-homogeneous structures in the galaxy can be modeled. Finally, we propose an observational strategy for a future photometric monitoring of the Einstein Cross. Based on observations obtained at NOT, La Palma.

  14. Structural and Temporal Requirements for Geomagnetic Field Reversal Deduced From 40Ar/39Ar Dated Lava Flows

    NASA Astrophysics Data System (ADS)

    Singer, B. S.; Hoffman, K. A.; Coe, R. S.; Brown, L. L.; Jicha, B. R.; Pringle, M. S.; Chauvin, A.

    2004-12-01

    40Ar/39Ar dating of lavas on Tahiti, long thought to record the primary part of the Matuyama-Bruhnes (M-B) reversa1, gives an age of 795+/- 7 ka, indistinguishable from that of transitional lavas in Chile and La Palma, but older than the accepted age for the reversal. Only the transitional lavas on Maui and one from La Palma (dated at 776 +/- 2 ka), agree with the astronomical age for the M-B reversal. Virtual geomagnetic poles (VGPs) associated with the Tahitian and Chilean lavas cluster near Australia, as do VGPs recorded on Tahiti during the Big Lost and Punaruu events, two apparently unsuccessful reversals. These findings, suggestive of a recurring, mantle-held flux pattern at the outer core surface during reversal attempts, are also theoretically equivalent to the situation that would arise today if the axial dipole were to continue to weaken and vanish. Hence, we propose that the 795 ka lavas record the onset of a dynamo process--one which only on occasion would result in polarity change. This initial instability, associated with the first of two decreases in field intensity, began 18 kyrs prior to the actual polarity switch. These data may provide the first observational support to the claim that complete reversals require a significant interval of time for magnetic flux to escape from the solid inner core and sufficiently weaken its stabilizing effect.

  15. Spectroscopy of planetary nebulae in M 33

    NASA Astrophysics Data System (ADS)

    Magrini, L.; Perinotto, M.; Corradi, R. L. M.; Mampaso, A.

    2003-03-01

    Spectroscopic observations of 48 emission-line objects of M 33 have been obtained with the multi-object, wide field, fibre spectrograph AF2/WYFFOS at the 4.2 m WHT telescope (La Palma, Spain). Line intensities and logarithmic extinction, cbeta , are presented for 42 objects. Their location in the Sabbadin & D'Odorico diagnostic diagram (Hα /[S II] vs. Hα /[N II]) suggests that >70% of the candidates are Planetary Nebulae (PNe). Chemical abundances and nebular physical parameters have been derived for the three of the six PNe where the 4363 Å, [O II]i emission line was measurable. These are disc PNe, located within a galactocentric distance of 4.1 kpc, and, to date, they are the farthest PNe with a direct chemical abundance determination. No discrepancy in the helium, Oxygen and Argon abundances has been found in comparison with corresponding abundances of PNe in our Galaxy. Only a lower limit to the sulphur abundance has been obtained since we could not detect any [S III] line. N/H appears to be lower than the Galactic value; some possible explanations for this under-abundance are discussed. Based on observations obtained at the 4.2 m WHT 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.

  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. 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).

  18. 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.

  19. 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.

  20. 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.

  1. 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

  2. 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

  3. Stemflow-induced processes of soil water storage

    NASA Astrophysics Data System (ADS)

    Germer, Sonja

    2013-04-01

    Compared to stemflow production studies only few studies deal with the fate of stemflow at the near-stem soil. To investigate stemflow contribution to the root zone soil moisture by young and adult babassu palms (Attalea speciosa Mart.), I studied stemflow generation, subsequent soil water percolation and root distributions. Rainfall, stemflow and perched water tables were monitored on an event basis. Perched water tables were monitored next to adult palms at two depths and three stem distances. Dye tracer experiments monitored stemflow-induced preferential flow paths. Root distributions of fine and coarse roots were related to soil water redistribution. Average rainfall-collecting area per adult palm was 6.4 m², but variability between them was high. Funneling ratios ranged between 16-71 and 4-55 for adult and young palms, respectively. Nonetheless, even very small rainfall events of 1 mm can generate stemflow. On average, 9 liters of adult palm stemflow were intercepted and stemflow tended to decrease for-high intensity rainfall events. Young babassu palms funneled rainfall via their fronds, directly to their subterranean stems. The funneling of rainfall towards adult palm stems, in contrast, led to great stemflow fluxes down to the soil and induced initial horizontal water flows through the soil, leading to perched water tables next to palms, even after small rainfall events. The perched water tables extended, however, only a few decimeters from palm stems. After perched water tables became established, vertical percolation through the soil dominated. To my knowledge, this process has not been described before, and it can be seen as an addition to the two previously described stemflow-induced processes of Horton overland flow and fast, deep percolation along roots. This study has demonstrated that Babassu palms funnel water to their stems and subsequently store it in the soil next to their stems in areas where coarse root length density is very high. This might

  4. 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

  5. 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

  6. 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

  7. 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.

  8. Evidence Of An Association Between The Presence Of Penumbrae And Strong Radial Outflows In Sunspots

    NASA Astrophysics Data System (ADS)

    Santiago Vargas, D.; Bonet, J. A.; Martinez Pillet, V.; Katsukawa, Y. %P87

    2007-01-01

    Time series of high-resolution images of the complex ac-tive region NOAA 10786 are studied. The observations were performed in G-band (430.5 nm) and in the nearby continuum (463.3 nm), on July 9, 2005 at the Swedish 1-meter Solar Telecope (SST) in La Palma. Granular proper motions in the surroundings of the sunspots have been quantified. A large-scale radial outflow in the velocity range 0.3 - 1 km s-1 has been measured around the sunspots by using local correlation tracking techniques. However, this outflow is not found in those regions around the sunspots with no penumbral structure. This result evidences an association between penumbrae and the existence of strong horizontal outflows (the moat) in sunspots.

  9. Small magnetic structures in the photosphere, radiative properties

    NASA Astrophysics Data System (ADS)

    Palacios, Judith; Domingo, Vicente; Cabello, Iballa; Bonet, José Antonio; Sánchez Almeida, Jorge

    The three dimensional structure of small magnetic field features in the photosphere, their dynamic behavior and their radiative properties are studied. We analyze data obtained in simultaneous observations made on Sept 29 and 30, 2007 with the HINODE spacecraft and the Swedish Solar Telescope (SST) in La Palma in different wavelengths, such as CaII (396.85 nm) and CN (388.35 nm) and other with Hinode data; and Gband (430.56 nm) with SST. Tha analysis is completed with high resolution Gband and Gcontinuum (436.39 nm) images from SST obtained on 2005 and 2006. Magnetograms have been obtained from both observatories. SST images have been processed with MOMFB code. Ribbon-like structures and "flowers" are studied in detail. Comparisons with solar atmospheric models are presented.

  10. Response of nighttime equatorial and low latitude F-region to the geomagnetic storm of August 18, 2003, in the Brazilian sector

    NASA Astrophysics Data System (ADS)

    Sahai, Y.; Becker-Guedes, F.; Fagundes, P. R.; Lima, W. L. C.; Otsuka, Y.; Huang, C.-S.; Espinoza, E. S.; Pi, X.; de Abreu, A. J.; Bolzan, M. J. A.; Pillat, V. G.; Abalde, J. R.; Pimenta, A. A.; Bittencourt, J. A.

    This paper presents an investigation of geomagnetic storm effects in the equatorial and low latitude F-region in the Brazilian sector during the intense geomagnetic storm on 18 August, 2003 (SSC 14:21 UT on 17/08; ΣKp = 52+; Ap = 108; ∣Dst∣ max = 168 at 1600 UT on 18/08). Simultaneous ionospheric sounding measurements from two stations, viz., Palmas (10.2°S, 48.2°W; dip latitude 5.7°S) and Sao Jose dos Campos (23.2°S, 45.9°W; dip latitude 17.6°S), Brazil, are presented for the nights of 16-17, 17-18 and 18-19 August, 2003 (quiet, disturbed and recovery phases). Both stations are equipped with the Canadian Advanced Digital Ionosonde (CADI). Quiet and disturbed conditions of the F-region ionosphere are compared using data collected from the two stations. The relationship between magnetospheric disturbance and low-latitude ionospheric dynamics, and generation of ionospheric irregularities are discussed. On the disturbed nights (17-18 and 18-19 August), the low latitude station S. J. Campos showed strong enhancements in the F-region critical frequency (foF2), whereas the near equatorial station Palmas showed strong uplifting of the F-layer about 1 h earlier. Normally during the June solstice months (May-August) in the Brazilian sector, large-scale ionospheric irregularities in form of plasma bubbles are rarely observed. On the night of 17-18 August, ionsospheric sounding observations at Palmas showed the presence of bottomside spread-F, whereas on the night of 18-19 August, the observations at Palmas and S. J. Campos showed the presence of plasma bubbles when the storm recovery phase had just started. The complementary GPS data available from several stations in the "Rede Brasileira de Monitoramento Continuo de GPS (Brazilian Network for Continuous GPS Monitoring)" are used to obtain the vertical total electron content (VTEC) and the rate of change of TEC per minute on UT days 18 and 19 August, 2003 and presented. Also, several global ionospheric TEC maps

  11. Galileo high-resolution encoder system

    NASA Astrophysics Data System (ADS)

    Mancini, Dario; Cascone, Enrico; Schipani, Pietro

    1997-09-01

    The Galileo National Telescope (TNG) is a 3.6 meter Alt-Az telescope installed at the Astronomical Observatory of the Roque de Los Muchachos in La Palma, Canary Islands (Spain). The TNG motion control system, designed and realized by the Technology Working Group (TWG), is completely digital because of the versatility of this system topology. In a digital control system using an encoder as transducer means to have a digital feedback signal, therefore directly comparable with the reference without any conversion that is essential with other kinds of transducers. In the following the Galileo telescope (TNG) encoder system with its control electronics and the management software are described. It has been realized by a collaboration between the Heidenhain Company and the TWG. The TNG encoder system, at the state of the art, has one of the highest performances in the telescopes field, in terms of resolution, accuracy, readout time, reliability.

  12. An extreme value model for maximum wave heights based on weather types

    NASA Astrophysics Data System (ADS)

    Rueda, Ana; Camus, Paula; Méndez, Fernando J.; Tomás, Antonio; Luceño, Alberto

    2016-02-01

    Extreme wave heights are climate-related events. Therefore, special attention should be given to the large-scale weather patterns responsible for wave generation in order to properly understand wave climate variability. We propose a classification of weather patterns to statistically downscale daily significant wave height maxima to a local area of interest. The time-dependent statistical model obtained here is based on the convolution of the stationary extreme value model associated to each weather type. The interdaily dependence is treated by a climate-related extremal index. The model's ability to reproduce different time scales (daily, seasonal, and interannual) is presented by means of its application to three locations in the North Atlantic: Mayo (Ireland), La Palma Island, and Coruña (Spain).

  13. 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

  14. 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.

  15. 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.

  16. VizieR Online Data Catalog: STELIB: A library of stellar spectra at R~2000 (Le Borgne+, 2003)

    NASA Astrophysics Data System (ADS)

    Le Borgne, J.-F.; Bruzual, G.; Pello, R.; Lancon, A.; Rocca-Volmerange, B.; Sanahuja, B.; Schaerer, D.; Soubiran, C.; Vilchez-Gomez, R.

    2003-04-01

    STELIB is a new spectroscopic stellar library, available at http://webast.ast.obs-mip.fr/stelib . It consists in an homogeneous library of stellar spectra in the visible range (3200 to 9500)Å), with an intermediate spectral resolution (<~3Å) and sampling (1Å), and corrected from interstellar absorption. This library includes 255 stars of various spectral types and luminosity classes, spanning a relatively wide range in metallicity. The spectral resolution, wavelength and spectral type coverage of this library represents a substantial improvement over previous libraries used in population synthesis models. The overall absolute photometric uncertainty is 3%. The data were obtained during two runs, one at the 1m Jacobus Kaptein Telescope (JKT), Roque de los Muchachos Observatory, La Palma, Canary Islands, Spain, between 1994 March 28 and April 4, and a second one at the 2.3m of the Australian National University at Siding Spring (SSO), Australia, between 1994 December 25 and 31. (1 data file).

  17. 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.

  18. A Monte-Carlo based extension of the Meteor Orbit and Trajectory Software (MOTS) for computations of orbital elements

    NASA Astrophysics Data System (ADS)

    Albin, T.; Koschny, D.; Soja, R.; Srama, R.; Poppe, B.

    2016-01-01

    The Canary Islands Long-Baseline Observatory (CILBO) is a double station meteor camera system (Koschny et al., 2013; Koschny et al., 2014) that consists of 5 cameras. The two cameras considered in this report are ICC7 and ICC9, and are installed on Tenerife and La Palma. They point to the same atmospheric volume between both islands allowing stereoscopic observation of meteors. Since its installation in 2011 and the start of operation in 2012 CILBO has detected over 15000 simultaneously observed meteors. Koschny and Diaz (2002) developed the Meteor Orbit and Trajectory Software (MOTS) to compute the trajectory of such meteors. The software uses the astrometric data from the detection software MetRec (Molau, 1998) and determines the trajectory in geodetic coordinates. This work presents a Monte-Carlo based extension of the MOTS code to compute the orbital elements of simultaneously detected meteors by CILBO.

  19. Expedition Atacama - project AMOS in Chile

    NASA Astrophysics Data System (ADS)

    Tóth, J.; Kaniansky, S.

    2016-01-01

    The Slovak Video Meteor Network operates since 2009 (Tóth et al., 2011). It currently consists of four semi-automated all-sky video cameras, developed at the Astronomical Observatory in Modra, Comenius University in Bratislava, Slovakia. Two new generations of AMOS (All-sky Meteor Orbit System) cameras operate fully automatically at the Canary Islands, Tenerife and La Palma, since March 2015 (Tóth et al., 2015). As a logical step, we plan to cover the southern hemisphere from Chile. We present observational experiences in meteor astronomy from the Atacama Desert and other astronomical sites in Chile. This summary of the observations lists meteor spectra records (26) between Nov.5-13, 2015 mostly Taurid meteors, single and double station meteors as well as the first light from the permanent AMOS stations in Chile.

  20. The search for planets around CM Draconis: Analysis of the 1994--96 database

    NASA Astrophysics Data System (ADS)

    Martin, E. L.; Deeg, H.; TEP Collaboration

    We present results of the international collaboration ``TEP'' aimed at monitoring photometrically the eclipsing binary CM Draconis in search for circumbinary planets. Planetary companions with more than ~2 earth radii should produce detectable occultations at the accuracy of our measurements. The observations started in spring 1994 and are still continuing with the participation of the following observatories: Haute Provence (France), Kouvovka (Russia), Lick (USA), La Palma (Spain), Rochester (USA), Skinakas (Greece), Taejon (Korea), Teide (Spain) and Wise (Israel). We have obtained a homogeneous dataset based on a common set of reference stars. So far, we have obtained some 1,000 hours of effective integration time on CM Dra. The analysis of the 1994-96 observations is complete, and list of about 20 events in the lightcurve has been obtained. These are being evaluated for their compatibility with possible planetary transits. Observations will be taken in 1997 again, to determine periodicities among these events.

  1. 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.

  2. 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.

  3. 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

  4. 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).

  5. 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.

  6. 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.

  7. 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.

  8. De-biasing of the velocity determination for double station meteor observations from CILBO

    NASA Astrophysics Data System (ADS)

    Albin, T.; Koschny, D.; Drolshagen, G.; Soja, R.; Poppe, B.; Srama, R.

    2015-01-01

    The Canary Islands Long-Baseline Observatory (CILBO) has been in operation since the end of 2011 and continuously working since January 2013 (Koschny et al., 2013). CILBO consists of two cameras on the island of Tenerife (camera ICC7) and La Palma (ICC9). To date, approximately 12000 meteors have been simultaneously measured, allowing precise orbit reconstruction. Certain meteors like Perseids show mostly persistent trains or wakes that may cause a position determination bias in the software. Large and fast meteors decelerate significantly during their appearance and cause an additional observational bias possibly by saturation effects on the CCD chips. Here we analyze these biases in the CILBO data and determine whether orbit reconstructions need to be corrected as a function of velocity, brightness or meteor shower.

  9. The NEON School Enters a New Era

    NASA Astrophysics Data System (ADS)

    Dennefeld, M.

    2004-12-01

    THE NEON SCHOOL, a school on astronomical observations organised by a collaboration of observatories (Asiago, Calar Alto, ESO, La Palma and OHP) is well known by PhD students in astronomy all over Europe. It runs tutorial observations directly at the telescope for students in small groups, under the supervision of an experienced astronomer. This way, the participants can execute a real scientific program with all the steps needed in professional life: preparation of the program with selection of targets and feasibility estimates; set-up of the instrument and calibrations; running of the observations, in general both imaging/photometry and spectroscopy; data reductions; and, finally, the presentation of the results at the end of the school.

  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. Instability and its relation to precipitation over the Eastern Iberian Peninsula

    NASA Astrophysics Data System (ADS)

    Iturrioz, I.; Hernández, E.; Ribera, P.; Queralt, S.

    2007-04-01

    Synoptic situations producing rainfall at four rawinsonde observatories at eastern Spain are classified as stratiform or convective depending on dynamic and thermodynamic instability indices. Two daily radiosonde and daily-accumulated precipitation data from four observatories in Eastern Spain are used: Madrid-Barajas (MB), Murcia (MU), Palma de Mallorca (PA) and Zaragoza (ZA). We calculated two thermodynamic instability indices from radiosonde data: CAPE and LI. Likewise, from ERA40 reanalysis data we have calculated the Q vector divergence over the Iberian Peninsula and Balearic Islands, as a parameter describing dynamical instability. Synoptic situations producing rainfall were classified as convective or stratiform, satisfying a criterion based on the values of dynamic and thermodynamic indices at each observatory. It is observed that the number of days with stratiform precipitation related to the total number of precipitation days follows a consistent annual pattern.

  12. Instrument control software based on LabVIEW for HARPS-N

    NASA Astrophysics Data System (ADS)

    Gao, Xiaofeng; Vick, Andy; Glenday, Alex; Gonzalez, Manuel

    2014-07-01

    HARPS-N (High-Accuracy Radial-Velocity planetary Search) is an instrument designed for the measurement of Radial Velocities (RV) at highest accuracy. It is located in the Northern hemisphere and installed at the TNG on La Palma Island. It has allowed scientists to confirm and characterize Earth-like mass planets: Kepler-78b. In this paper, we present the design of Instrument Control Software (ICS) based on LabVIEW, the key features of implementation such as the XML-RPC, labVIEW Classes and Shared Variables. We also present here the auto-guiding and fibre hole finding algorithm. Use of XML-RPC in Labview for ICS with COTS hardware has made the development of HARAPS-N ICS easily in implementing and integrating with other software in a limited construction time scale.

  13. Report on the ESO-ESA-IAU Conference Communicating Astronomy with the Public 2005

    NASA Astrophysics Data System (ADS)

    Robson, I.; Christensen, L. L.

    2005-09-01

    Over one hundred astronomers, public information officers, planetarium specialists and image-processing gurus descended on ESO Garching in June for CAP 2005 - Communicating Astronomy with the Public 2005. This was the third international conference addressing astronomy outreach; the previous venues being La Palma and Washington DC. The main aim was to bring together the specialists from the various strands of astronomy undertaking outreach in the broadest sense. The four-day conference was a resounding success, much was achieved and the work of ESO was better appreciated (especially from the non- European perspective) through a tour of the facility. Some of the highlights of the local environs were much enjoyed through the conference dinner at the Deutsche Museum's aviation museum “Flugwerft Schleißheim” - (including cockpit tours of an F4 Phantom) and a splendid (and well liquid refreshed) evening at the Augustinerkeller, one of the largest Munich Biergartens.

  14. High-resolution imaging in the visible on large ground-based telescopes

    NASA Astrophysics Data System (ADS)

    MacKay, Craig; Rebolo, Rafael; Crass, Jonathan; King, David L.; Labadie, Lucas; González Escalera, Victor; Puga, Marta; Pérez Garrido, Antonio; López, Roberto; Oscoz, Alejanrdo; Pérez-Prieto, Jorge A.; Rodríguez-Ramos, Luis F.; Velasco, Sergio; Villó, Isidro

    2014-07-01

    Lucky Imaging combined with a low order adaptive optics system has given the highest resolution images ever taken in the visible or near infrared of faint astronomical objects. This paper describes a new instrument that has already been deployed on the WHT 4.2m telescope on La Palma, with particular emphasis on the optical design and the predicted system performance. A new design of low order wavefront sensor using photon counting CCD detectors and multi-plane curvature wavefront sensor will allow virtually full sky coverage with faint natural guide stars. With a 2 x 2 array of 1024 x 1024 photon counting EMCCDs, AOLI is the first of the new class of high sensitivity, near diffraction limited imaging systems giving higher resolution in the visible from the ground than hitherto been possible from space.

  15. Spatial distribution and statistical properties of small-scale convective vortex-like motions in a quiet-Sun region

    NASA Astrophysics Data System (ADS)

    Vargas Domínguez, S.; Palacios, J.; Balmaceda, L.; Cabello, I.; Domingo, V.

    2011-09-01

    High-resolution observations of a quiet-Sun internetwork region taken with the Solar 1-m Swedish Telescope in La Palma are analysed. We determine the location of small-scale vortex motions in the solar photospheric region by computing the horizontal proper motions of small-scale structures on time-series of images. These plasma convectively driven swirl motions are associated to (1) downdrafts (that have been commonly explained as corresponding to sites where the plasma is cooled down and hence returned to the interior below the visible photospheric level) and (2) horizontal velocity vectors converging on a central point. The sink cores are proved to be the final destination of passive floats tracing plasma flows towards the centre of each vortex. We establish the occurrence of these events to be 1.4 × 10-3 and 1.6 × 10-3 vortices Mm-2 min-1, respectively, for the two time-series analysed here.

  16. 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).

  17. 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.

  18. Erratum: Observations and Atmospheric Parameters of Super-Metal-rich Candidates

    NASA Astrophysics Data System (ADS)

    Malagnini, M. L.; Morossi, C.; Buzzoni, A.; Chavez, M.

    2001-01-01

    In the paper ``Observations and Atmospheric Parameters of Super-Metal-rich Candidates'' by M. L. Malagnini, C. Morossi, A. Buzzoni, and M. Chavez (PASP, 112, 1455 [2000]), the affiliations for M. L. Malagnini and A. Buzzoni are incorrect in the print, PDF, and Postscript versions. The affiliations are correct in the HTML version. The correct affiliation for M. L. Malagnini is Dipartimento di Astronomia, Università degli Studi di Trieste, via G. B. Tiepolo 11, 34131 Trieste, Italy. The correct affiliations for A. Buzzoni are Osservatorio Astronomico di Brera, via Bianchi 46, 23807 Merate (Lc), Italy; and Telescopio Nazionale Galileo, Observatorio Roque de los Muchachos, A.P. 565, 38700 Santa Cruz de La Palma, Canary Islands, Spain. The Press sincerely regrets this error.

  19. 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. PMID:24772040

  20. 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

  1. X-ray, ultraviolet, and optical observations of the intermediate polar FO Aquarii (H2215-086)

    SciTech Connect

    Chiappetti, L.; Belloni, T.; Bonnet-Bidaud, J.M.; Del Gratta, C.; De Martino, D.; Max-Planck-Institut fuer Extraterrestrische Physik, Garching; CEA, Centre d'Etudes Nucleaires de Saclay, Gif-sur-Yvette; Milano Universita, Milan; Osservatorio Astronomico di Capodimonte, Naples )

    1989-07-01

    An extensive set of quasi-simultaneous, multiwavelength observations of the intermediate polar FO Aqr (H2215-086) obtained in 1983-1985 with the Exosat and IUE satellites and from La Palma Observatory are presented. The rotational 21 minute period and sideband periods due to beating with the orbital modulation are observed in the optical band and in X-rays. In particular, it is noticeable that an unusual sideband frequency at Omega(rot) + 2 Omega(orb) is present in X-rays. Variability of the spectrum with the rotation period is detected, which can be interpreted as modulation by an absorbing envelope. A possible improvement to the current orbital ephemeris, based on photometric data, is also presented. 42 refs.

  2. Are the colors of Centaurs biased by underestimated coma contamination?

    NASA Astrophysics Data System (ADS)

    Perna, D.; Mazzotta Epifani, E.; Barucci, A.; Brucato, J.; Dall'Ora, M.; Dotto, E.; Licandro, J.; Palumbo, P.; Tozzi, G.

    2014-07-01

    Considering that Centaurs are transitional objects from the transneptunian populations to the Jupiter family comets and that about 10 % of the population showed comet-like activity, their investigation can provide key information upon the compositional gradient and evolutionary effects in the outer solar system. In particular, the origin of the well-known color bimodality of Centaurs still represents a source of debate: some authors think that it may be due to different primordial compositions, while others are more in favor of recent evolutionary processes. Unfortunately, until now, only a few tens of Centaurs have been physically characterized, over a known population of about two hundred objects. Hence, using different telescopes (mainly TNG and NOT in La Palma), we started a campaign to obtain multi-band deep photometry of tens of targets, in order to estimate the real fraction of active Centaurs and derive the relationships between activity, surface colors, and dynamical properties. Our preliminary results will be presented and discussed.

  3. New Ground-based Spectral Observations of Mercury and Comparison with the Moon

    NASA Technical Reports Server (NTRS)

    Blewett, D. T.; Warell, J.

    2003-01-01

    Spectroscopic observations (400-670 nm) of Mercury were made at La Palma with the Nordic Optical Telescope (NOT) in June and July of 2002. Extensive observations of solar analog standard stars and validation spectra of 7 Iris and a variety of locations on the Moon were also collected. The 2002 Mercury data were also combined with previous observations (520-970 nm) from the Swedish Solar Vacuum Telescope (SVST). A spectrum (400-970 nm) calibrated to standard bidirectional geometry (alpha=i=30deg, e=0deg) was constructed based on the spectral slopes from 2002. The combined spectrum permits analysis with the Lucey lunar abundance relations for FeO and TiO2.

  4. 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.

  5. Monitoring spectroscopic binaries in anticipation of Gaia

    NASA Astrophysics Data System (ADS)

    Pourbaix, Dimitri; Halbwachs, Jean-Louis; Arenou, Frederic

    2015-08-01

    For several already known spectroscopic binaries, it is anticipated that Gaia will provide an exquisite astrometric orbit of the photocenter. In case of double-lined spectroscopic binaries, the orbital inclination supplied by Gaia will lead to the mass of both components.. For those masses to be useful, an accuracy of 2-3% is required. This can only be achieved if the spectroscopic orbit is very accurate too. A long term monitoring of good spectroscopic candidates in on going on Sophie at the Observatory of Haute Provence and on Hermes on the Mercator telescope in La Palma. For some of these systems, we have already derived a definitive SB2 orbital solution while, for others, the secondary remains unreachable. We present these new solutions in conjunction with the possible impact on the Hipparcos astrometric solution.

  6. Multi-observatory observations of night-side of Venus at 2.3 micron - atmospheric circulation from tracking of cloud features

    NASA Astrophysics Data System (ADS)

    Limaye, Sanjay; Warell, Johan; Bhatt, Bhywan C.; Fry, Patrick M.; Young, Eliot F.

    2006-06-01

    Observations of Venus were made during 3 May to 11 May 2004 (117.4o - 125.7o phase angle) and 3 July to 10 July, 2004 (132.5o - 125.1o phase angle) from the 1.2-metre Mt. Abu Telescope at Gurushikhar, Himalayan Chandra Telescope at Mt. Saraswati, Hanle and the Nordic Optical Telescope at La Palma, Canary Islands and the NASA/Infra Red Telescope Facility (IRTF) at Mauna Kea, Hawaii in J and K bands. While the sunlit crescent portion was saturated in the detector, the night-side shows discrete cloud features. These features are seen to evolve over time and are markers of the atmospheric flow at tilda 53 km altitude above the surface. By combining multi-site observations, we are able to make measurements of zonal cloud velocities over baselines that are several hours long and get a better idea of the evolution of the features over time.

  7. VizieR Online Data Catalog: Cl* IC 348 H 254 VRI light curves (Ripepi+, 2014)

    NASA Astrophysics Data System (ADS)

    Ripepi, V.; Molinaro, R.; Marconi, M.; Catanzaro, G.; Claudi, R.; Daszynska-Daszkiewicz, J.; Palla, F.; Leccia, S.; Bernabei, S.

    2015-03-01

    Photometric data were acquired in the Johnson-Cousins system V, RC and IC with the AFOSC1 and BFOSC2 instruments at the 1.8m Asiago and 1.54m Loiano telescopes, respectively. The AFOSC@1.82m instrument was equipped with a TK1024AB 1024x1024 CCD, with a pixel size of 0.47-arcsec and a total field of view of about 8.1-arcminx8.1-arcmin. The BFOSC@1.54m was equipped with an EEV CCD 1300x1340 pixel of individual size 0.58-arcsec and a total field of view of 13-arcminx13-arcmin. The spectroscopic observations were carried out with the SARG instrument, which is a high-resolution (from R=29000 to 164000) cross-dispersed echelle spectrograph covering a spectral range from λ=370 to 1000nm mounted at Telescopio Nazionale Galileo (TNG, La Palma, Canarie, Spain). (1 data file).

  8. 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.

  9. 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

  10. VizieR Online Data Catalog: u'BVg'r'i'z' light curves of SN 2008ax (Pastorello+, 2008)

    NASA Astrophysics Data System (ADS)

    Pastorello, A.; Kasliwal, M. M.; Crockett, R. M.; Valenti, S.; Arbour, R.; Itagaki, K.; Kaspi, S.; Gal-Yam, A.; Smartt, S. J.; Griffith, R.; Maguire, K.; Ofek, E. O.; Seymour, N.; Stern, D.; Wiethoff, W.

    2010-02-01

    SN 2008ax is one of the best ever monitored core-collapse SNe, starting with a deep pre-explosion image obtained only 6h prior to the SN discovery of Mostardi et al. (2008CBET.1280....1M). The observational campaign of SN 2008ax started soon after the discovery and covered a period of about 70d. Photometry has been obtained at the 2-m Liverpool Telescope in La Palma (Canary Islands, Spain) and the 60-inch Telescope of the Palomar Observatory. In addition, unfiltered data collected by amateur astronomers have been used in our analysis. These data have been scaled to the Johnson-Bessell V-band or the Sloan r'-band photometry, depending on the sensitivity curves of the CCDs used in these observations. (2 data files).

  11. 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.

  12. VizieR Online Data Catalog: Equivalent width of 21 RR Lyrae stars (Pancino+, 2015)

    NASA Astrophysics Data System (ADS)

    Pancino, E.; Britavskiy, N.; Romano, D.; Cacciari, C.; Mucciarelli, A.; Clementini, G.

    2015-02-01

    Equivalent widths and atomic data of the absorption lines used in the abundance analysis, for each separate exposure at different phases. Observations of 15 RR Lyrae stars (DR And, X Ari, TW Boo, RZ Cam, RX Cet, U Com, RV CrB, SW CVn, UZ CVn, AE Dra, SZ Gem, VX Her, DH Hya, TU UMa, and RV UMa) and one BL Her star (UY Eri) were carried out with SARG@TNG, operated on the island of La Palma, Spain, during two separate runs in 2009 March and between September and November. Eight stars (SW Aqr, TW Cap, DH Hya, V Ind, SS Leo, V716 Oph, BK Tuc, and UV Vir) were observed with UVES@VLT, between 2009 April and August in service mode. (3 data files).

  13. 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.

  14. 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.

  15. Superconducting cameras for optical astronomy

    NASA Astrophysics Data System (ADS)

    Martin, D. D. E.; Verhoeve, P.; de Bruijne, J. H. J.; Reynolds, A. P.; van Dordrecht, A.; Verveer, J.; Page, J.; Rando, N.; Peacock, A.

    2002-05-01

    superconducting Tunnel junctions (STJs) have been extensively investigated it as photon detectors covering the range from near-infrared to x-ray energies. A 6× 6 array of Tantalum junctions has performed multiple astronomical observations of optical sources using the wiliam Herschel 4.2m telescope at La Palma. Following the success of this programme, we are now developing a second generation camera. The goals of this programme are to increase the field of view of the instrument from “4× 4” to “5×9”, to optimize IR rejection filters, possibly extending the `red' response to ~ lum and to increase the electronics readout speed. For these purposes, we are developing a new Superconducting Tunnel Junction Array consisting of 10× 12 Tantalum/Aluminium devices as well as an important readout system. In this paper, we review the instrument's architecture and describe the performance of the new detector

  16. 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)

  17. The Search for Polarization Variability in IM Pegasi

    NASA Astrophysics Data System (ADS)

    Berdyugin, A. V.; Berdyugina, S. V.; Piirola, V.; Butkevich, A. G.

    2006-11-01

    We have studied linear polarization in the RS CVn binary IM Pegasi in order to check the possibility that this star has variable polarization. For this purpose, accurate polarization measurements in the B, V, and R passbands with the new CCD polarimeter on the remotely operated KVA telescope at La Palma were carried out in 2005 August-November. Our observations have yielded accurate determination of the polarization in IM Peg: PB=0.064%+/-0.004%, θB=97deg+/-2deg PV=0.102%+/-0.006%, θV=91deg+/-3deg and PR=0.078%+/-0.005%, θR=95deg+/-4deg. Analysis of the data indicates no significant polarization variability in IM Peg. The upper limit for the amplitude of possible variability is <=0.03% in all passbands. In contrast to the previously published results, the linear polarization in this star is most likely nonvariable and interstellar in origin.

  18. 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.

  19. CCD photometry and astrometry for visual double and multiple stars of the HIPPARCOS catalogue. I. Presentation of the large scale project

    NASA Astrophysics Data System (ADS)

    Oblak, E.; Lampens, P.; Cuypers, J.; Halbwachs, J. L.; Martín, E.; Seggewiss, W.; Sinachopoulos, D.; van Dessel, E. L.; Chareton, M.; Duval, D.

    1999-06-01

    A description is given of the activities of an international working group created with the aim of obtaining both photometric and astrometric observations of visual double and multiple stars with angular separations in the range of one to fifteen arcseconds, that formed part of the HIPPARCOS Input Catalogue. The scientific aims and realisations of this European network are given. About 50 observational missions have been carried out in both hemispheres according to a pre-defined protocol. We describe the general and specifically designed methods used for the reduction of large amounts of CCD observations of double stars and give an outline of the results already presented and soon to be expected. Based on observations made at La Silla (ESO, Chile - Key Programme 7-009-49 K), Observatoire de Haute-Provence (OHP), Calar Alto (CLA), La Palma (LPL) and Jungfraujoch (JFJ) Observatories}

  20. Mechanics of LIRIS (long-slit intermediate-resolution infrared spectrograph) at first commissioning

    NASA Astrophysics Data System (ADS)

    Hernandez, Elvio; Acosta-Pulido, Jose; Cadavid, Emilio; Correa, Santiago; Peraza, Lorenzo; Redondo, Pablo; Sanchez, Vicente; Tenegi, Fabio; Manchado, Arturo; Barreto, Mary

    2004-09-01

    LIRIS is a near-infrared intermediate resolution spectrograph with added capabilities for multi-slit, imaging, coronography, and polarimetry, developed by the Instituto de Astrofisica de Canarias (IAC). It will be a common user instrument for the Cassegrain focus of the William Herschel Telescope (WHT) at the Roque de los Muchachos Observatory in La Palma. At its first commissioning, that was held in February 2003, the functionality of the mechanisms (entrance wheel, central wheels and camera wheel) under variable orientation of the telescope was verified, and no thermal nor structural problems arose. The functionality of the mechanical interface with telescope (allows for up to 5 mm of lateral displacements in the attachment plane), of the LIRIS handling trolley, of the transport equipment and of all the equipments used in the integration was also checked. For the second commissioning of LIRIS, which has been held in March 2004, some modifications have been done. The results of both commissionings were satisfactory.

  1. 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

  2. A multi-frequency study of symbiotic stars. I - Near-simultaneous optical and radio observations

    NASA Astrophysics Data System (ADS)

    Ivison, R. J.; Bode, M. F.; Roberts, J. A.; Meaburn, J.; Davis, R. J.; Nelson, R. F.; Spencer, R. E.

    1991-03-01

    The relationship between optical line flux and 5 GHz radio flux is investigated for a sample of 17 northern sky symbiotic stars. Data were obtained near-simultaneously with the Manchester Echelle Spectrograph mounted on the Issac Newton Telescope, La Palma and the Broad Band Interferometer at Jodrell Bank. Color excesses, calculated from Balmer hydrogen line fluxes assuming Case B recombination ratios, are compared with other reddening estimates and also combined with extinction maps to provide improved distance estimates. Optical line fluxes are used in combination with radio fluxes to estimate physical parameters of these objects, including mass-loss rates. The suggestion that the ionized regions of D-type symbiotics are much more extensive than those in S-type is confirmed. This in turn strengthens the hypothesis that S-type symbiotics are more likely to be undergoing Roche-lobe overflow than their D-type counterparts.

  3. The major upgrade of the MAGIC telescopes, Part I: The hardware improvements and the commissioning of the system

    NASA Astrophysics Data System (ADS)

    Aleksić, J.; Ansoldi, S.; Antonelli, L. A.; Antoranz, P.; Babic, A.; Bangale, P.; Barceló, M.; Barrio, J. A.; Becerra González, J.; Bednarek, W.; Bernardini, E.; Biasuzzi, B.; Biland, A.; Bitossi, M.; Blanch, O.; Bonnefoy, S.; Bonnoli, G.; Borracci, F.; Bretz, T.; Carmona, E.; Carosi, A.; Cecchi, R.; Colin, P.; Colombo, E.; Contreras, J. L.; Corti, D.; Cortina, J.; Covino, S.; Da Vela, P.; Dazzi, F.; DeAngelis, A.; De Caneva, G.; De Lotto, B.; de Oña Wilhelmi, E.; Delgado Mendez, C.; Dettlaff, A.; Dominis Prester, D.; Dorner, D.; Doro, M.; Einecke, S.; Eisenacher, D.; Elsaesser, D.; Fidalgo, D.; Fink, D.; Fonseca, M. V.; Font, L.; Frantzen, K.; Fruck, C.; Galindo, D.; García López, R. J.; Garczarczyk, M.; Garrido Terrats, D.; Gaug, M.; Giavitto, G.; Godinović, N.; González Muñoz, A.; Gozzini, S. R.; Haberer, W.; Hadasch, D.; Hanabata, Y.; Hayashida, M.; Herrera, J.; Hildebrand, D.; Hose, J.; Hrupec, D.; Idec, W.; Illa, J. M.; Kadenius, V.; Kellermann, H.; Knoetig, M. L.; Kodani, K.; Konno, Y.; Krause, J.; Kubo, H.; Kushida, J.; La Barbera, A.; Lelas, D.; Lemus, J. L.; Lewandowska, N.; Lindfors, E.; Lombardi, S.; Longo, F.; López, M.; López-Coto, R.; López-Oramas, A.; Lorca, A.; Lorenz, E.; Lozano, I.; Makariev, M.; Mallot, K.; Maneva, G.; Mankuzhiyil, N.; Mannheim, K.; Maraschi, L.; Marcote, B.; Mariotti, M.; Martínez, M.; Mazin, D.; Menzel, U.; Miranda, J. M.; Mirzoyan, R.; Moralejo, A.; Munar-Adrover, P.; Nakajima, D.; Negrello, M.; Neustroev, V.; Niedzwiecki, A.; Nilsson, K.; Nishijima, K.; Noda, K.; Orito, R.; Overkemping, A.; Paiano, S.; Palatiello, M.; Paneque, D.; Paoletti, R.; Paredes, J. M.; Paredes-Fortuny, X.; Persic, M.; Poutanen, J.; Prada Moroni, P. G.; Prandini, E.; Puljak, I.; Reinthal, R.; Rhode, W.; Ribó, M.; Rico, J.; Rodriguez Garcia, J.; Rügamer, S.; Saito, T.; Saito, K.; Satalecka, K.; Scalzotto, V.; Scapin, V.; Schultz, C.; Schlammer, J.; Schmidl, S.; Schweizer, T.; Sillanpää, A.; Sitarek, J.; Snidaric, I.; Sobczynska, D.; Spanier, F.; Stamerra, A.; Steinbring, T.; Storz, J.; Strzys, M.; Takalo, L.; Takami, H.; Tavecchio, F.; Tejedor, L. A.; Temnikov, P.; Terzić, T.; Tescaro, D.; Teshima, M.; Thaele, J.; Tibolla, O.; Torres, D. F.; Toyama, T.; Treves, A.; Vogler, P.; Wetteskind, H.; Will, M.; Zanin, R.

    2016-01-01

    The MAGIC telescopes are two Imaging Atmospheric Cherenkov Telescopes (IACTs) located on the Canary island of La Palma. The telescopes are designed to measure Cherenkov light from air showers initiated by gamma rays in the energy regime from around 50 GeV to more than 50 TeV. The two telescopes were built in 2004 and 2009, respectively, with different cameras, triggers and readout systems. In the years 2011-2012 the MAGIC collaboration undertook a major upgrade to make the stereoscopic system uniform, improving its overall performance and easing its maintenance. In particular, the camera, the receivers and the trigger of the first telescope were replaced and the readout of the two telescopes was upgraded. This paper (Part I) describes the details of the upgrade as well as the basic performance parameters of MAGIC such as raw data treatment, linearity in the electronic chain and sources of noise. In Part II, we describe the physics performance of the upgraded system.

  4. Organic chemicals from the Chihuahuan desert

    SciTech Connect

    Campos-Lopez, E.; Roman-Alemany, A.

    1980-03-01

    A consideration of social, economic, political, and technological factors in the search for new renewable sources of raw materials suggests the exploitation and development of the resources of marginal land regions. Desert regions on the North American continent, which cannot be used for food production, nonetheless, grow a variety of indigenous floral species which offer, in their chemical composition, possibilities for agroindustrial development. Prospects for utilization of the resources of the Chihuahuan Desert for the production of organic raw materials are presented. Research and development projects presently underway in Mexico for the commercialization of plants such as Guayule (Parthenium argentatum), Creosote Bush (Larrea tridentata), Candelilla (Euphorbia antisyphilitica), and Palma (Yucca filiera), among others, are documented. Raw materials obtained from such plants are characterized, with emphasis on the identification of components of industrial interest. Current bench and pilot plant activities, as well as process and product development requirements, are detailed.

  5. Response of nighttime equatorial and low latitude F-region to the geomagnetic storm of August 18, 2003, in the Brazilian sector

    NASA Astrophysics Data System (ADS)

    Sahai, Y.; Univap Team

    This paper presents an investigation of geomagnetic storm effects in the equatorial and low latitude F-region in the Brazilian sector during the intense geomagnetic storm on 18 August 2003 SSC 14 21 UT on 17 08 Sigma Kp 52 Ap 108 vert Dst vert max 168 at 1600 UT on 18 08 Simultaneous ionospheric sounding measurements from two stations viz Palmas 10 2 o S 48 2 o W dip latitude 5 7 o S and S a o Jos e dos Campos 23 2 o S 45 9 o W dip latitude 17 6 o S Brazil are presented for the nights of 16-17 17-18 18-19 19-20 August 2003 quiet disturbed and recovery phases Both stations are equipped with the Canadian Advanced Digital Ionosonde CADI Quiet and disturbed conditions of the F-region ionosphere are compared using data collected from the two stations The relationship between magnetospheric disturbance and low-latitude ionospheric dynamics and generation of ionospheric irregularities will be discussed The GPS data available from several stations in Rede Brasileira de Monitoramento Cont i nuo de GPS Brazilian Network for Continuous GPS Monitoring are used to obtain the vertical total electron content VTEC and the rate of change of TEC per minute on UT days 18 and 19 August 2003 During the disturbed nights the low latitude station S J Campos showed strong positive phase whereas the near equatorial station Palmas showed strong uplifting of the F-layer Normally during the winter months May to August in the Brazilian sector large-scale ionospheric irregularities in form of plasma

  6. ESO & NOT photometric monitoring of the Cloverleaf quasar

    NASA Astrophysics Data System (ADS)

    Ostensen, R.; Remy, M.; Lindblad, P. O.; Refsdal, S.; Stabell, R.; Surdej, J.; Barthel, P. D.; Emanuelsen, P. I.; Festin, L.; Gosset, E.; Hainaut, O.; Hakala, P.; Hjelm, M.; Hjorth, J.; Hutsemekers, D.; Jablonski, M.; Kaas, A. A.; Kristen, H.; Larsson, S.; Magain, P.; Pettersson, B.; Pospieszalska-Surdej, A.; Smette, A.; Teuber, J.; Thomsen, B.; van Drom, E.

    1997-12-01

    The Cloverleaf quasar, H1413+117, has been photometrically monitored at ESO (La Silla, Chile) and with the NOT (La Palma, Spain) during the period 1987--1994. All good quality CCD frames have been successfully analysed using two independent methods (i.e. an automatic image decomposition technique and an interactive CLEAN algorithm). The photometric results from the two methods are found to be very similar, and they show that the four lensed QSO images vary significantly in brightness (by up to 0.45 mag), nearly in parallel. The lightcurve of the $D$ component presents some slight departures from the general trend which are very likely caused by micro-lensing effects. Upper limits, at the 99% confidence level, of 150 days on the absolute value for the time delays between the photometric lightcurves of this quadruply imaged variable QSO, are derived. This is unfortunately too large to constrain the lens model but there is little doubt that a better sampling of the lightcurves should allow to accurately derive these time delays. Pending a direct detection of the lensing galaxy (position and redshift), this system thus constitutes another good candidate for a direct and independent determination of the Hubble parameter. Based on observations collected at the European Southern Observatory (La Silla, Chile) and with the Nordic Optical Telescope (La Palma, Spain). Table 1. Logbook for the ESO and NOT observations together with photometric results for the Cloverleaf quasar. This long table can be accessed on the WWW at the URL address: http://vela.astro.ulg.ac.be/grav_lens/glp_homepage.html}

  7. Liverpool Telescope 2: a new robotic facility for time domain astronomy in 2020+

    NASA Astrophysics Data System (ADS)

    Copperwheat, C. M.; Steele, I. A.; Bates, S. D.; Smith, R. J.; Bode, M. F.; Baker, I.; Peacocke, T.; Thomson, K.

    2014-07-01

    The robotic 2m Liverpool Telescope, based on the Canary island of La Palma, has a diverse instrument suite and a strong track record in time domain science, with highlights including early time photometry and spectra of supernovae, measurements of the polarization of gamma-ray burst afterglows, and high cadence light curves of transiting extrasolar planets. In the next decade the time domain will become an increasingly prominent part of the astronomical agenda with new facilities such as LSST, SKA, CTA and Gaia, and promised detections of astrophysical gravitational wave and neutrino sources opening new windows on the transient universe. To capitalise on this exciting new era we intend to build Liverpool Telescope 2: a new robotic facility on La Palma dedicated to time domain science. The next generation of survey facilities will discover large numbers of new transient sources, but there will be a pressing need for follow-up observations for scientific exploitation, in particular spectroscopic follow-up. Liverpool Telescope 2 will have a 4-metre aperture, enabling optical/infrared spectroscopy of faint objects. Robotic telescopes are capable of rapid reaction to unpredictable phenomena, and for fast-fading transients like gamma-ray burst afterglows. This rapid reaction enables observations which would be impossible on less agile telescopes of much larger aperture. We intend Liverpool Telescope 2 to have a world-leading response time, with the aim that we will be taking data with a few tens of seconds of receipt of a trigger from a ground- or space-based transient detection facility. We outline here our scientific goals and present the results of our preliminary optical design studies.

  8. Shallow seismic imaging of flank collapse structures in oceanic island volcanoes: Application to the Western Canary Islands

    NASA Astrophysics Data System (ADS)

    Sanchez, L.; González, P.; Tiampo, K. F.

    2013-12-01

    Volcanic flank collapse counts among the many hazards associated with volcanic activity. This type of event involves the mobilization of large volumes, producing debris avalanches. It affects mostly oceanic island volcanoes, involving the potential for tsunami occurrence. Geophysical imaging can illuminate subvolcanic features such as volcano-tectonic structures, magmatic plumbing systems or differences in rock type. The most commonly used geophysical methods are gravity, electromagnetics and seismics. In particular, seismic measurements quantify anomalies in seismic waves propagation velocities and can be used to obtain information on the subsurface arrangement of different materials. In the Western Canary Islands, the Cumbre Vieja volcano in La Palma (Canary Islands) has been proposed to be near the collapse stage. Previous geophysical studies that have been carried out on the flank of the volcano comprise gravity and electromagnetic methods. These types of surveys gather information on the deep structures of the volcano (1-2 km). In this project, we complement previous studies by using seismic methods to investigate the near-surface seismic structure of the Cumbre Vieja fault system (La Palma Island) and the structure of the well-developed San Andres fault system (El Hierro Island). We aim to compare the Cumbre Vieja and San Andres fault systems to infer the degree of maturity of collapse structures. We carried out reflection and refraction seismic surveys in order to image approximately the first 10 meters of the subsurface. We used 24 low frequency (4,5 Hz) geophones as receivers and a sledge hammer as the seismic source. The survey lines were located across visible parts of the fault systems at the Cumbre Vieja volcano and the San Andres fault in El Hierro. Here, we present the survey setup and results from the preliminary analysis of the data.

  9. 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

  10. Pronounced Fixation, Strong Population Differentiation and Complex Population History in the Canary Islands Blue Tit Subspecies Complex

    PubMed Central

    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