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1

MBL Research in the Rio Tinto  

NSDL National Science Digital Library

This web site describes ongoing research of the Marine Biological Laboratory's Astrobiology Group in the Rio Tinto, Spain. The resource includes an image-rich introduction to the Rio Tinto, images of sample sites, information about Rio Tinto biofilms, a list of Rio Tinto references, and a 10-page print-version pdf document including information found on the web site.

Zettler, L. A.; Laboratory, Marine B.

2

RioTinto Centre for Materials and Sensing in Mining  

E-print Network

technologies of the future to provide step-change benefits to Rio Tinto operations. RTCMSM was created via and to be leading the Centre on its way to providing Rio Tinto with step-change technology benefits. With the strong Modus Operandi To provide Rio Tinto with step-change technology benefits through global

3

Fungal jarosite biomineralization in Río Tinto.  

PubMed

Río Tinto is an extreme environment located at the core of the Iberian Pyrite Belt (IPB). It is an unusual ecosystem due to its size, constant acidic pH, high concentration of heavy metals and a high level of microbial diversity, mainly eukaryotic. Recently it was described the biomineralization of jarosite by Purpureocillium lilacinum, an acidic filamentous fungi isolated from the banks of the Tinto basin. In this study we further investigate the specificity of jarosite biomineralization by this fungi and its importance in the generation of jarosite in the Río Tinto basin. Our results clearly show that the ratio of the redox pairs and the Fe(3+) concentration is important to achieve a specific biomineralization of jarosite. The amount of nucleation sites also seems to be critical, although the presence of nucleation sites by itself is not sufficient to precipitate jarosite. There is a good correlation between the sampling sites along the river in which hydronium-jarosite has been identified and the presence of P. lilacinum. PMID:25445568

Oggerin, Monike; Rodríguez, Nuria; del Moral, Catalina; Amils, Ricardo

2014-11-01

4

Microbial Ecology of an Extreme Acidic Environment, the Tinto River  

Microsoft Academic Search

The Tinto River (Huelva, southwestern Spain) is an extreme environment with a rather constant acidic pH along the entire river and a high concentration of heavy metals. The extreme conditions of the Tinto ecosystem are generated by the metabolic activity of chemolithotrophic microorganisms thriving in the rich complex sulfides of the Iberian Pyrite Belt. Molecular ecology techniques were used to

E. Gonzalez-Toril; E. Llobet-Brossa; E. O. Casamayor; R. Amann; R. Amils

2003-01-01

5

Mars Analog Rio Tinto Experiment (MARTE): 2003 Drilling Campaign to Search for a Subsurface Biosphere at Rio Tinto Spain  

NASA Technical Reports Server (NTRS)

The MARTE (Mars Astrobiology Research and Technology Experiment) project, an ASTEP field experiment, is exploring for a hypothesized subsurface anaerobic chemoautotrophic biosphere in the region of the Tinto River- or Rio Tinto- in southwestern Spain. It is also demonstrating technology needed to search for a subsurface biosphere on Mars. The project has three primary objectives: (1) search for and characterize subsurface life at Rio Tinto along with the physical and chemical properties and sustaining energy sources of its environment, (2) perform a high fidelity simulation of a robotic Mars drilling mission to search for life, and (3) demonstrate the drilling, sample handling, and instrument technologies relevant to searching for life on Mars. The simulation of the robotic drilling mission is guided by the results of the aseptic drilling campaign to search for life at Rio Tinto. This paper describes results of the first phase of the aseptic drilling campaign.

Stoker, Carol; Dunagan, Stephen; Stevens, Todd; Amils, Ricardo; Gomez-Elvira, Javier; Fernandez, David; Hall, James; Lynch, Kennda; Cannon, Howard; Zavaleta, Jhony

2004-01-01

6

Testing Tinto's Model of Attrition on the Church-Related Campus. AIR 1985 Annual Forum Paper.  

ERIC Educational Resources Information Center

The applicability of Tinto's model of retention for first-year students attending church-related colleges and universities is examined. Data collected from entering freshmen at two Midwestern Seventh-day Adventist colleges were used to replicate studies of Tinto's model done in other settings. Based on Tinto's model, indicators of academic and…

Cash, R. William; Bissel, H. LeVerne

7

Río Tinto: A Geochemical and Mineralogical Terrestrial Analogue of Mars  

PubMed Central

The geomicrobiological characterization of the water column and sediments of Río Tinto (Huelva, Southwestern Spain) have proven the importance of the iron and the sulfur cycles, not only in generating the extreme conditions of the habitat (low pH, high concentration of toxic heavy metals), but also in maintaining the high level of microbial diversity detected in the basin. It has been proven that the extreme acidic conditions of Río Tinto basin are not the product of 5000 years of mining activity in the area, but the consequence of an active underground bioreactor that obtains its energy from the massive sulfidic minerals existing in the Iberian Pyrite Belt. Two drilling projects, MARTE (Mars Astrobiology Research and Technology Experiment) (2003–2006) and IPBSL (Iberian Pyrite Belt Subsurface Life Detection) (2011–2015), were developed and carried out to provide evidence of subsurface microbial activity and the potential resources that support these activities. The reduced substrates and the oxidants that drive the system appear to come from the rock matrix. These resources need only groundwater to launch diverse microbial metabolisms. The similarities between the vast sulfate and iron oxide deposits on Mars and the main sulfide bioleaching products found in the Tinto basin have given Río Tinto the status of a geochemical and mineralogical Mars terrestrial analogue. PMID:25370383

Amils, Ricardo; Fernández-Remolar, David

2014-01-01

8

Río Tinto: A Geochemical and Mineralogical Terrestrial Analogue of Mars  

NASA Astrophysics Data System (ADS)

The geomicrobiological characterization of the water column and sediments of Río Tinto (Huelva, Southwestern Spain) have proven the importance of the iron and the sulfur cycles, not only in generating the extreme conditions of the habitat (low pH, high concentration of toxic heavy metals), but also in maintaining the high level of microbial diversity detected in the basin. It has been proven that the extreme acidic conditions of Río Tinto basin are not the product of 5000 years of mining activity in the area, but the consequence of an active underground bioreactor that obtains its energy from the massive sulfidic minerals existing in the Iberian Pyrite Belt. Two drilling projects, MARTE (Mars Astrobiology Research and Technology Experiment) (2003-2006) and IPBSL (Iberian Pyrite Belt Subsurface Life Detection) (2011-2015), were developed and carried out to provide evidence of subsurface microbial activity and the potential resources that support these activities. The reduced substrates and the oxidants that drive the system appear to come from the rock matrix. These resources need only groundwater to launch diverse microbial metabolisms. The similarities between the vast sulfate and iron oxide deposits on Mars and the main sulfide bioleaching products found in the Tinto basin have given Río Tinto the status of a geochemical and mineralogical Mars terrestrial analogue.

Amils, Ricardo; Fernández-Remolar, David

2014-09-01

9

IL CONTRIBUTO DI ROBERTO CONTI ALLA TEORIA MATEMATICA DEI CONTROLLI  

E-print Network

IL CONTRIBUTO DI ROBERTO CONTI ALLA TEORIA MATEMATICA DEI CONTROLLI Roberto Conti ha dato, in particolare, su quella parte dell'attivit`a scientifica di Roberto Conti che rientra nell'ambito della teoria, per dare un'idea di quello che Roberto Conti ha rappresentato per lo sviluppo della teoria matematica

Bacciotti, Andrea

10

A Path Analytic Validation of Tinto's Theory of College Student Attrition.  

ERIC Educational Resources Information Center

An earlier path analytic study of the predictive validity of Tinto's theory of college student attrition was replicated using an independent sample of students from another university. Tinto conceived of the attrition/retention process as a series of sociopsychological interactions between the characteristics students bring with them to college…

Terenzini, Patrick T.; And Others

11

Audio Interview with Dr. Carol Stoker about MARTE and the Rio Tinto  

NSDL National Science Digital Library

This site features links to broadcast quality audio files and transcripts from an interview with Dr. Carol Stoker about the Mars Analog Research and Technology Experiment (MARTE) which is to take place near the Rio Tinto in Spain. Interview topics include the MARTE expedition, the definition of an extremophile, the significance of the color and pH of Rio Tinto, equipment for the MARTE experiment, the possibility of a Mars drilling mission, and the resemblance of Rio Tinto geochemistry to that of Mars.

Stoker, Carol

2009-06-18

12

Microbial Community Composition and Ecology of an Acidic Aquatic Environment: The Tinto River, Spain  

NSDL National Science Digital Library

This journal article examines the correlation between physicochemical and biological characteristics of the Rio Tinto in Spain. It explains that the extreme acidic environment of the Rio Tinto is due to the metabolic activity of chemolithotrophic microorganisms. The article includes an illustration depicting the geographical position of the Rio Tinto with highlighted sampling and mining sites, tables indicating the values of physio-chemical parameters measured in different seasons and in different rivers, a table listing the taxonomic classification of different microbial groups in the Rio Tinto, a table examining the seasonality of microorganism populations in different sampling sites, phenotypic properties of different sulfur-oxidizing bacteria, and a correlation analysis. A paid subscription to SpringerLink is required to view this article.

Lopez-Archilla, A.; Marin, I.; Amils, R.; Ecology, Microbial

13

Heavy metal anomalies in the Tinto and Odiel River and estuary system, Spain  

Microsoft Academic Search

The Tinto and Odiel rivers drain 100 km from the Rio Tinto sulphide mining district, and join at a 20-km long estuary entering\\u000a the Atlantic Ocean. A reconnaissance study of heavy metal anomalies in channel sand and overbank mud of the river and estuary\\u000a by semi-quantitative emission dc-arc spectrographic analysis shows the following upstream to downstream ranges in ppm (?g

C. H. Nelson; P. J. Lamothe

1993-01-01

14

Mineralogy and geochemistry of alluvium contaminated by metal mining in the Rio Tinto area, southwest Spain  

Microsoft Academic Search

The Rio Tinto in SW Spain drains Cu and pyrite mines which have been in operation since at least the Bronze Age. Extensive metal mining, especially from 1873 to 1954, has resulted in contamination of the Rio Tinto alluvium with As, Cu, Pb, Ag and Zn. X-ray diffraction (XRD), wavelength-dispersive X-ray mapping, scanning electron microscope petrography and X-ray energy-dispersive (EDX)

Karen A Hudson-Edwards; Christiane Schell; Mark G Macklin

1999-01-01

15

Tinto's Separation Stage and Its Influence on First-Semester College Student Persistence  

Microsoft Academic Search

Examination of student departure for various student populations, in different institutional settings, and at various stages in time is crucial in the quest to improve retention (Tinto, 1988, 1993). Therefore, this study explored first- to second-semester persistence of first-time, full-time freshmen at a public, four-year institution, focusing upon Tinto's concept of separation. The question of how various underlying dimensions of

Susan A. Elkins; John M. Braxton; Glenn W. James

2000-01-01

16

Eukaryotic Organisms in Extreme Acidic Environments, the Río Tinto Case  

NASA Astrophysics Data System (ADS)

A major issue in microbial ecology is to identify the limits of life for growth and survival, and to understand the molecular mechanisms that define these limits. Thus, interest in the biodiversity and ecology of extreme environments has grown in recent years for several reasons. Some are basic and revolve around the idea that extreme environments are believed to reflect early Earth conditions. Others are related to the biotechnological potential of extremophiles. In this regard, the study of extremely acidic environments has become increasingly important since environmental acidity is often caused by microbial activity. Highly acidic environments are relatively scarce worldwide and are generally associated with volcanic activity or mining operations. For most acidic environments, low pH facilitates metal solubility, and therefore acidic waters tend to have high concentrations of heavy metals. However, highly acidic environments are usually inhabited by acidophilic and acidotolerant eukaryotic microorganisms such as algae, amoebas, ciliates, heliozoan and rotifers, not to mention filamentous fungi and yeasts. Here, we review the general trends concerning the diversity and ecophysiology of eukaryotic acidophilic microorganims, as well as summarize our latest results on this topic in one of the largest extreme acidic rivers, Río Tinto (SW, Spain).

Angeles Aguilera, Angeles

2013-07-01

17

Geomorphic and Aqueous Chemistry of a Portion of the Upper Rio Tinto System, Spain  

NASA Technical Reports Server (NTRS)

Observations from the two Mars rovers, Spirit and Opportunity, combined with discoveries of extensive hydrated sulfate deposits from OMEGA and CRISM show that aqueous deposition and alteration involving acidic systems and sulfate deposition has been a key contributor to the martian geologic record. Rio Tinto, Spain, provides a process model for formation of sulfates on Mars by evaporation of acidic waters within shallow fluvial pools, particularly during dry seasons. We present results from a detailed investigation of an upper portion of the Rio Tinto, focusing on geomorphology, clastic sediment transport, and acidic aqueous processes. We also lay out lessons-learned for under-standing sulfate formation and alteration on Mars.

Osburn, M. R.; Fernandez-Remolar, D. C.; Arvidson, R. E.; Morris, R. V.; Ming, D.; Prieto-Ballesteros, O.; Amils, R.; Stein, T. C.; Heil-Chapdelaine, V.; Friedlander, L. R.; Herndon, B.; Marlow, J.; Rosenberg, S.; Scherpker, K.; Steiner, A.

2007-01-01

18

Spectroscopic Raman study of sulphate precipitation sequence in Rio Tinto mining district (SW Spain).  

PubMed

Acidic waters and sulphate-rich precipitates are typical by-products of mining activity such as in Rio Tinto (Huelva, SW Spain). This river drains pyrite mines situated in the Iberian Pyrite Belt which have been in operation since the Bronze Age and probably constitutes the oldest continuously operating mining activity over the world. In the present work, we have used Raman spectroscopy to study a wide range of natural mineral samples collected at Rio Tinto which origin is related to evaporation and mineral transformation processes in a wet and extreme acidic environment. In addition, we simulated the phenomenon of mineral precipitation in controlled conditions by using a simulator developed at the laboratory evaporating natural water collected at Rio Tinto. Also, a series of experiments using the same waters as small droplets have been carried out using micro-Raman technique. The droplets were placed on substrates with different chemical composition and reactivity. The results reveal that the precipitation sequence occurred in Rio Tinto mainly comprises copiapite and coquimbite group minerals followed by several other low hydrated iron sulphates. The experiments carried out on droplets allow estimating with higher accuracy the precipitation sequence. PMID:23818074

Rull, Fernando; Guerrero, Julia; Venegas, Gloria; Gázquez, Fernando; Medina, Jesús

2014-06-01

19

Identification of the subsurface sulfide bodies responsible for acidity in Río Tinto source water, Spain  

NASA Astrophysics Data System (ADS)

The acidic waters of the Río Tinto rise from several acidic springs that emerge in the area surrounding Peña de Hierro (Fernández-Remolar et al., 2005). These springs are located above minor normal faults that act as natural conduits for the water from the underlying deep aquifer. Although it has been suggested that the acidity of the river originates from the biooxidation of massive and stockwork sulfides (Fernández-Remolar et al., 2008a), the location of the source for these acidic solutions has not previously been established. This lack of evidence has been used to suggest that the acidity of the Río Tinto may be the product of the most conspicuous of the possible source, the extensive mining of the area over approximately the last 5000 years (Davis et al., 2000). In this paper, we report resistivity and time-domain electromagnetic sounding data from the Río Tinto aquifer to a depth of ?600 m, revealing the locations for the acidic sources. Both types of data support the presence of two distinct geological units that we interpret as thrust sheets emplaced onto each other during the Variscan orogeny of the Carboniferous. These units, both of which contain massive and stockwork sulfides, act as the aquifer for the acidic waters of the Río Tinto. Under this scenario, which is in agreement with the geological record of the Río Tinto fluvial system for the past 6 Ma (Moreno et al., 2003), our results imply that mining activity had little influence on the generation of the acidic river waters.

Gómez-Ortiz, David; Fernández-Remolar, David C.; Granda, Ángel; Quesada, Cecilio; Granda, Teresa; Prieto-Ballesteros, Olga; Molina, Antonio; Amils, Ricardo

2014-04-01

20

Governo apresenta reforma da rede do Superior em Maro sem contributo dos reitores  

E-print Network

Governo apresenta reforma da rede do Superior em Março sem contributo dos reitores O Ministério da a racionalização da rede do Superior que vai passar pela cria- ção de consórcios entre universida- des e

Instituto de Sistemas e Robotica

21

Heavy metal anomalies in the Tinto and Odiel river and estuary system, Spain  

SciTech Connect

The Tinto and Odiel river drain 100 km from the Rio Tinto sulphide mining district and join at a 20-km estuary entering the Atlantic Ocean. A reconnaissance study of heavy metal anomalies in channel sand and overbank mud of the river and estuary shows the following upstream to downstream ranges in ppm ([mu]g g[sup [minus]1]): As 3,000 to <200, Cd 30 to <0.1, Cu 1,500 to 10, Pb 2,000 to <10, Sb 300 to <150, and Zn 3,000 to <200. Organic-rich sandy-silty overbank clay has been analyzed to represent suspended load materials. The high content of heavy metals in the overbank clay throughout the river and estuary systems indicates the importance of suspended sediment transport for dispersing heavy metals from natural erosion and anthropogenic mining activities of the sulfide deposit. The organic-poor river bed sand has been analyzed to represent bedload transport of naturally-occurring sulfide minerals. The sand has high concentrations of metals upstream, decreasing by an order of magnitude in the lower estuary. Although heavy metal contamination of estuary mouth beach sand has been diluted to background levels, estuary mud exhibits increased contamination apparently related to finer grain size, higher organic carbon content, precipitation of river-borne dissolved solids, and input of anthropogenic heavy metals from industrial sources. The contaminated estuary mud disperses to the inner shelf mud belt and offshore suspended sediment, which exhibit metal anomalies from natural erosion and mining of upstream Rio Tinto sulphide lode sources (Pb, Cu, Zn) and industrial activities within the estuary (Fe, Cr, Ti). Because heavy metal contamination of Tinto-Odiel river sediment reaches or exceeds the highest levels encountered in other river sediments of Spain and Europe, a detailed analysis of metals in water and suspended sediment throughout the system, and epidemiological analysis of heavy metal effects in humans is appropriate. 36 refs., 8 figs., 4 tabs.

Nelson, C.H.; Lamothe, P.J. (Geological Survey, Menlo Park, CA (United States))

1993-12-01

22

Fossilization potential of iron-bearing minerals in acidic environments of Rio Tinto, Spain: Implications for Mars exploration  

NASA Astrophysics Data System (ADS)

Acidic waters of the Rio Tinto, southwestern Spain, evaporate seasonally, precipitating a variety of iron sulfide and oxide minerals. Schwertmannite and nanophase goethite form thin laminae on biological and detrital grain surfaces, replicating, among other things, the morphologies of insect cuticle, plant tissues, fungi, algae, and bacteria. Intergrain cements also incorporate bacterial cells and filaments. Other sulfate minerals precipitated in Rio Tinto environments are transient and contribute little to short-term preservation. Because the Rio Tinto has been cutting its current valley for several million years, terrace deposits provide a window on longer term fossil preservation. Early and later diagenesis are recorded in terrace deposits formed about one thousand and two million years ago, respectively. The sedimentary structures and mineralogies of these deposits suggest that they formed under physical and chemical conditions comparable to those of modern Rio Tinto sediments. The terrace deposits show quantitative loss of sulfate minerals, increasing crystallinity of goethite and, in the older terrace, replacement of goethite by hematite. Fossils formed originally by schwertmannite and nanophase goethite replication persist through diagenesis, preserving a long term record of local biological diversity. Fossil preservation by iron oxides in the acidic environment of Rio Tinto suggests that if life was present when sedimentary rocks formed at Meridiani Planum, Mars, precipitated minerals could record their presence.

Fernández-Remolar, David C.; Knoll, Andrew H.

2008-03-01

23

Classification of Modern and Old Río Tinto Sedimentary Deposits Through the Biomolecular Record Using a Life Marker Biochip: Implications for Detecting Life on Mars  

Microsoft Academic Search

The particular mineralogy formed in the acidic conditions of the Río Tinto has proven to be a first-order analogue for the acid-sulfate aqueous environments of Mars. Therefore, studies about the formation and preservation of biosignatures in the Río Tinto will provide insights into equivalent processes on Mars. We characterized the biomolecular patterns recorded in samples of modern and old fluvial

Victor Parro; David Fernández-Remolar; José A. Rodríguez-Manfredi; Patricia Cruz-Gil; Luis A. Rivas; Marta Ruiz-Bermejo; Mercedes Moreno-Paz; Miriam García-Villadangos; David Gómez-Ortiz; Yolanda Blanco-López; César Menor-Salván; Olga Prieto-Ballesteros; Javier Gómez-Elvira

2011-01-01

24

Ecological study of the fungal populations of the acidic Tinto River in southwestern Spain.  

PubMed

The characterization of the microbial ecology of the Tinto River, an extreme habitat with an extremely low pH and a high concentration of heavy metals, revealed an unexpected level of microbial richness. A variety of microbial eukaryotes was isolated, among them several fungal strains that were identified and their physiological characteristics studied. Ninety strains of yeast were isolated from the Tinto River. Fifty-two percent of them were capable of growth in vitro using medium amended with river water. They belong to 6 genera of basidiomycetes (Rhodotorula, Cryptococcus, Tremella, Holtermannia, Leucosporidium, and Mrakia) and 2 of ascomycetes (Candida and Williopsis). In addition, 349 strains of hyphomycetes belonging to 17 genera (most of them ascomycetes) were isolated and studied. Forty-four percent of the isolated filamentous fungi (154 strains) were capable of growing in vitro using medium amended with Tinto River water. Of this percentage, 19% (29 strains) belonged to the genus Penicillium (16 species) and 66% (102 strains) were included in the genera Scytalidium, Bahusakala, Phoma, and Heteroconium or showed dark sterile mycelia, which probably are of dematiaceous hyphomycetes. In addition, we characterized strains of the ascomycete genera Lecythophora and Acremonium and of the zygomycete genus Mortierella, all of them capable of growing in medium amended with river water. Statistical correlation of biological and physicochemical variables suggested a positive relationship between the dematiaceous hyphomycetes and the most extreme physicochemical conditions found in the Tinto River. Principal components analysis confirmed this relationship and also showed that the Acremonium and Lecythophora groups had environmental preferences similar to those of dematiaceous fungi. The spatial positions of the sampling sites were grouped in 2 main clusters: (i) sampling sites in the mine zone in which most of the dematiaceous, Acremonium, and Lecythophora strains were isolated and (ii) sites that were not in the mine zone and sampling station 5 from which were isolated mainly strains of fungi that were not capable of growing in the medium amended with river water and species of the Penicillium genus. PMID:15644909

López-Archilla, A I; González, A E; Terrón, M C; Amils, R

2004-11-01

25

Heavy metal anomalies in the Tinto and Odiel River and estuary system, Spain  

USGS Publications Warehouse

The Tinto and Odiel rivers drain 100 km from the Rio Tinto sulphide mining district, and join at a 20-km long estuary entering the Atlantic Ocean. A reconnaissance study of heavy metal anomalies in channel sand and overbank mud of the river and estuary by semi-quantitative emission dc-arc spectrographic analysis shows the following upstream to downstream ranges in ppm (??g g-1): As 3,000 to <200, Cd 30 to <0.1, Cu 1,500 to 10, Pb 2,000 to <10, Sb 3000 to <150, and Zn 3,000 to <200. Organic-rich (1.3-2.6% total organic carbon, TOC), sandysilty overbank clay has been analyzed to represent suspended load materials. The high content of heavy metals in the overbank clay throughout the river and estuary systems indicates the importance of suspended sediment transport for dispersing heavy metals from natural erosion and anthropogenic mining activities of the sulfide deposit. The organic-poor (0.21-0.37% TOC) river bed sand has been analyzed to represent bedload transport of naturally-occurring sulfide minerals. The sand has high concentrations of metals upstream but these decrease an order of magnitude in the lower estuary. Although heavy metal contamination of estuary mouth beach sand has been diluted to background levels estuary mud exhibits increased contamination apparently related to finer grain size, higher organic carbon content, precipitation of river-borne dissolved solids, and input of anthropogenic heavy metals from industrial sources. The contaminated estuary mud disperses to the inner shelf mud belt and offshore suspended sediment, which exhibit metal anomalies from natural erosion and mining of upstream Rio Tinto sulphide lode sources (Pb, Cu, Zn) and industrial activities within the estuary (Fe, Cr, Ti). Because heavy metal contamination of Tinto-Odiel river sediment reaches or exceeds the highest levels encountered in other river sediments of Spain and Europe, a detailed analysis of metals in water and suspended sediment throughout the system, and epidemiological analysis of heavy metal effects in humans is appropriate. ?? 1993 Estuarine Research Federation.

Nelson, C.H.; Lamothe, P.J.

1993-01-01

26

The magnetic properties of Rio Tinto Basin sediments (Spain): a step towards Martian enviromagnetics  

NASA Astrophysics Data System (ADS)

Exploration by the NASA rover Opportunity revealed sulphate-and haematite-rich sedimentary rocks exposed in surface features of Meridiani Planum, Mars. Sediments of the Rio Tinto Basin, Spain, provide at least a partial analog of Meridiani rocks, thereby facilitating an understanding of mineral precipitation and diagenesis on the Martian surface. Here we present the results of a mineral magnetic study of river terrace deposits of the Rio Tinto system, the deposits ranging from Modern to Plio-Pleistocene in age. A broad range of temperature- and field-dependent measurements have been made which have identified the presence of goethite, haematite and sulphides. Seasonally driven processes are thought to lead to the precipitation of nano-phase goethite which increases in crystallinity with age, eventually being replaced by haematite. Diverse micro-organism populations inhabit the acidic and seasonally dry environments, although organic matter does not persist in the sediments. However, biosignatures are left as casts and molds in the iron oxide minerals. The potential for recognizing their characteristic magnetic signatures, and their extrapolation to Martian environments, will be discussed.

McIntosh, G.; Hernandez, F. M.; Remolar, D. F.; de La Presa, P.; Marin, P.; Marcos, V. V.

2008-12-01

27

Characterization of a Subsurface Biosphere in a Massive Sulfide Deposit At Rio Tinto, Spain: Implications For Extant Life On Mars  

NASA Technical Reports Server (NTRS)

The recent discovery of abundant sulfate minerals, particularly Jarosite by the Opportunity Rover at Sinus Merdiani on Mars has been interpreted as evidence for an acidic lake or sea on ancient Mars [1,2], since the mineral Jarosite is soluble in liquid water at pH above 4. The most likely mechanism to produce sufficient protons to acidify a large body of liquid water is near surface oxidation of pyrite rich deposits [3]. The acidic waters of the Rio Tinto, and the associated deposits of Hematite, Goethite, and Jarosite have been recognized as an important chemical analog to the Sinus Merdiani site on Mars [4]. The Rio Tinto is a river in southern Spain that flows 100 km from its source in the Iberian pyrite belt, one of the Earth's largest Volcanically Hosted Massive Sulfide (VHMS) provinces, into the Atlantic ocean. The river originates in artesian springs emanating from ground water that is acidified by the interaction with subsurface pyrite ore deposits. The Mars Analog Rio Tinto Experiment (MARTE) has been investigating the hypothesis that a subsurface biosphere exists at Rio Tinto living within the VHMS deposit living on chemical energy derived from sulfur and iron minerals. Reduced iron and sulfur might provide electron donors for microbial metabolism while in situ oxidized iron or oxidants entrained in recharge water might provide electron acceptors.

Stoker, C. R.; Stevens, T.; Amils, R.; Gomez-Elvira, J.; Rodriguez, N.; Gomez, F.; Gonzalez-Toril, E.; Aguilera, A.; Fernandez-Remolar, D.; Dunagan, S.

2005-01-01

28

Characterization of a Subsurface Biosphere in a Massive Sulfide Deposits at Rio Tinto, Spain: Implications for Extant Life on Mars  

NASA Technical Reports Server (NTRS)

The recent discovery of abundant sulfate minerals, particularly Jarosite by the Opportunity Rover at Sinus Merdiani on Mars has been interpreted as evidence for an acidic lake or sea on ancient Mars [1,2], since the mineral Jarosite is soluble in liquid water at pH above 4. The most likely mechanism to produce sufficient protons to acidify a large body of liquid water is near surface oxidation of pyrite rich deposits [3]. The acidic waters of the Rio Tinto, and the associated deposits of Hematite, Goethite, and Jarosite have been recognized as an important chemical analog to the Sinus Merdiani site on Mars [4]. The Rio Tinto is a river in southern Spain that flows 100 km from its source in the Iberian pyrite belt, one of the Earth s largest Volcanically Hosted Massive Sulfide (VHMS) provinces, into the Atlantic ocean. The river originates in artesian springs emanating from ground water that is acidified by the interaction with subsurface pyrite ore deposits. The Mars Analog Rio Tinto Experiment (MARTE) has been investigating the hypothesis that a subsurface biosphere exists at Rio Tinto living within the VHMS deposit living on chemical energy derived from sulfur and iron minerals. Reduced iron and sulfur might provide electron donors for microbial metabolism while in situ oxidized iron or oxidants entrained in recharge water might provide electron acceptors.

Stoker, C. R.; Stevens, T.; Amils, R.; Gomez-Elvira, J.; Rodriquez, N.; Gomez, F.; Gonzalez-Toril, E.; Aguilera, A.; Fernandez-Remolar, D.; Dunagan, S.

2005-01-01

29

TinTO: A Tool for the View-Based Analysis of Streams of Stock Market Data  

Microsoft Academic Search

TinTO is an experimental system aiming at demonstrating the usefulness and feasibility of applying conventional SQL queries for analyzing a wide spectrum of data streams. As application area we have chosen the analysis of streams of stock market data, mainly because this kind of application exhibits sufficiently many of those characteris- tics for which relational query technology can be reasonably

Andreas Behrend; Christian Dorau; Rainer Manthey

2007-01-01

30

Combined Raman-LIBS, Moessbauer and XRD In-Situ Mineral Analysis of Evaporite Minerals at Rio Tinto (Spain)  

NASA Astrophysics Data System (ADS)

In this study a combination of Raman, LIBS, Mössbauer and XRD portable instruments has been used to undertake a common in-situ analysis of sulphate minerals at Rio Tinto area within the CAREX Field Procedure Inter-comparison Exercise 2009.

Rull, F.; Klingelhöfer, G.; Sarrazin, P.; Medina, J.; Fleischer, I.; Blake, D.; Martin Ramos, J. D.

2010-04-01

31

Tinto's Separation Stage and Its Influence on First-Semester College Student Persistence. AIR 1998 Annual Forum Paper.  

ERIC Educational Resources Information Center

This study examined first- to second-semester persistence of first-time, full-time college freshmen at a public four-year institution, focusing on Tinto's (1993) concept of separation. Data were collected from 689 first-time, full-time freshmen using the Cooperative Institutional Research Program 1995 Student Information Form, and from 411…

Elkins, Susan A.; Braxton, John M.; James, Glenn W.

32

Influence of releases from a fresh water reservoir on the hydrochemistry of the Tinto River (SW Spain).  

PubMed

The Tinto River is an extreme case of pollution by acid mine drainage (AMD), with pH values below 3 and high sulphate, metal and metalloid concentrations along its main course. This study evaluates the impact of releases from a freshwater reservoir on the Tinto River, identifying the metal transport mechanisms. This information is needed to understand the water quality evolution in the long term, and involves the comprehension of interactions between AMD sources, freshwaters, particulate matter and sediments. This work proposes a methodology for quantifying the proportions in which the different sources are contributing. The method is based on the mass balance of solutes and accounts for the uncertainty of end-members. The impact of the releases from the Corumbel Reservoir on the hydrochemistry of the Tinto River was significant, accounting up to a 92% of river discharge. These releases provoked a sharp decrease in dissolved metal concentrations, especially for Fe (approximately 1000 fold) due to dilution and precipitation. Cadmium, Zn, Cu, Co, Ni and Al suffered a dilution to a 12-16 fold decrease while Ca, Sr, Na, Pb and Si were less affected (2-4 folds decrease). However, these releases also gave rise to an increase in particulate transport, mainly Fe, As, Cr, Ba, Pb and Ti, due to sediment remobilisation and Fe precipitation. Aluminium, Li, K, Si, Al, Ni and Sr, together with Cu were present in the particulate phase during the discharge peak. The proposed 2-component mixing model revealed the existence of non-conservative behaviour for Al, Ca, Li, Mn, Ni and Si as a consequence of the interactions between the acidic Tinto waters and the clay-rich reservoir sediments during the bottom outlet opening. These results were improved by a 3-component mixing model, introducing a new end-member to account the chemical dissolution of clay-rich sediments by acidic Tinto waters. PMID:22221869

Cánovas, Carlos Ruiz; Olias, Manuel; Vazquez-Suñé, Enric; Ayora, Carlos; Miguel Nieto, Jose

2012-02-01

33

Multidisciplinary integrated field campaign to an acidic Martian Earth analogue with astrobiological interest: Rio Tinto  

NASA Astrophysics Data System (ADS)

Recently reported results from latest Mars Orbiters and Rovers missions are transforming our opinion about the red planet. That dry and inhospitable planet reported in the past is becoming a wetter planet with high probabilities of water existence in the past. Nowadays, some results seem to indicate the presence of water beneath the Mars surface. But also mineralogy studies by NASA Opportunity Rover report iron oxides and hydroxides precipitates on Endurance Crater. Sedimentary deposits have been identified at Meridiani Planum. These deposits must have generated in a dune aqueous acidic and oxidizing environment. Similarities appear when we study Rio Tinto, and acidic river under the control of iron. The discovery of extremophiles on Earth widened the window of possibilities for life to develop in the Universe, and as a consequence on Mars and other planetary bodies with astrobiological interest. The compilation of data produced by the ongoing missions offers an interested view for life possibilities to exist: signs of an early wet Mars and rather recent volcanic activity as well as ground morphological characteristics that seem to be promoted by liquid water. The discovery of important accumulations of sulfates and the existence of iron minerals such as jarosite in rocks of sedimentary origin has allowed specific terrestrial models to come into focus. Río Tinto (Southwestern Spain, Iberian Pyritic Belt) is an extreme acidic environment, product of the chemolithotrophic activity of micro-organisms that thrive in the massive pyrite-rich deposits of the Iberian Pyritic Belt. Some particular protective environments should house the organic molecules and bacterial life forms in harsh environments such as Mars surface supporting microniches inside precipitated minerals or inside rocks. Terrestrial analogues could help us to afford the comprehension of habitability (on other planetary bodies). We are reporting here the multidisciplinary study of some endolithic niches inside salt deposits used by phototrophs for taking advantage of sheltering particular light wavelengths. These acidic salts deposits located in Río Tinto shelter life forms that are difficult to visualize by eye. This interdisciplinary field analogue campaign was conducted in the framework of the CAREX FP7 EC programme.

Gómez, F.; Walter, N.; Amils, R.; Rull, F.; Klingelhöfer, A. K.; Kviderova, J.; Sarrazin, P.; Foing, B.; Behar, A.; Fleischer, I.; Parro, V.; Garcia-Villadangos, M.; Blake, D.; Martin Ramos, J. D.; Direito, S.; Mahapatra, P.; Stam, C.; Venkateswaran, K.; Voytek, M.

2011-07-01

34

Subsurface geomicrobiology in a Mars terrestrial analogue, Río Tinto (SW, Spain)  

NASA Astrophysics Data System (ADS)

Since its discovery, only few years ago, subsurface geomicrobiology is a matter of growing interest [1]. From a fundamental point of view, it seeks to determine whether life can be sustained in the absence of radiation. From an astrobiological point of view, it is an interesting model for life in other planetary bodies, e.g., Mars, as well as early life on Earth. Río Tinto is an unusual extreme acidic environment due to its size (around 100 km), constant acidic pH (mean pH 2.3), high concentrations of heavy metals and high level of microbial diversity [2]. Río Tinto rises in the core of the Iberian Pyritic Belt, one of the biggest sulfidic ore deposits in the world [3]. Today it is well stablished that the extreme characteristics of Río Tinto are not due to acid mine drainage from mining activity, as has been suggested in the past. To explore the hypothesis that a continuous underground reactor of chemolithotrophic microorganisms thriving in the rich sulfidic minerals of the Iberian Pyritic Belt is responsible for the extreme conditions found in the system, a drilling project has been developed to detect evidence of subsurface microbial activity and potential resources to support these microbial communities in situ (MARTE project) [4]. Here we report a search for subsurface life in volcanically hosted massive sulfidic deposits from the Iberian Pyritic Belt. Aseptic core samples were obtained within and down-gradient from the massive sulfide deposits and formation water was sampled within the resulting bore holes. Microbial activity was detected in un-contaminated samples by culture-dependent and culture-independent methods. Aerobic iron- and sulfide- oxidizing bacteria, and anaerobic denitrifying thiosulfate-oxidizing bacteria, sulfate reducing bacteria and methanogenic archaea have been identified. Potential energy fluxes detected in the system include oxidation of reduced iron and sulfur, or hydrogen gas coupled to nitrite, sulfate, ferric iron, inorganic carbon or transient oxygen. These results suggest that multiple energy sources are available from sulfide-mineral weathering to support microbial metabolism, even in the absence of atmospheric oxygen. [1] Stevens, T.O and McKinley, J.P. (1995) Scienc,, 270, 450-454. [2] Amis, R. et al. (2007) Planet Space Sci, 55, 370- 381. [3] Fernández-Remolar, D. et al. (2005) Earth Planet Sci Lett, 240, 149-167. [4] Amils, R. et al. (2008) Microbiology of Extreme Soils, 205-223.

Amils, R.; Fernández-Remolar, D.; Gómez, F.; González-Toril, E.; Rodríguez, N.; Prieto-Ballesteros, O.; Sanz, J. L.; Díaz, E.; Stoker, C.

2008-09-01

35

The Rio Tinto Basin, Spain: Mineralogy, Sedimentary Geobiology, and Implications for Interpretation of Outcrop Rocks at Meridiani Planum, Mars  

NASA Technical Reports Server (NTRS)

Exploration by the NASA rover Opportunity has revealed sulfate- and hematite-rich sedimentary rocks exposed in craters and other surface features of Meridiani Planum, Mars. Modern, Holocene, and Plio-Pleistocene deposits of the Rio Tinto, southwestern Spain, provide at least a partial environmental analog to Meridiani Planum rocks, facilitating our understanding of Meridiani mineral precipitation and diagenesis, while informing considerations of martian astrobiology. Oxidation, thought to be biologically mediated, of pyritic ore bodies by groundwaters in the source area of the Rio Tinto generates headwaters enriched in sulfuric acid and ferric iron. Seasonal evaporation of river water drives precipitation of hydronium jarosite and schwertmannite, while (Mg,Al,Fe(sup 3+))-copiapite, coquimbite, gypsum, and other sulfate minerals precipitate nearby as efflorescences where locally variable source waters are brought to the surface by capillary action. During the wet season, hydrolysis of sulfate salts results in the precipitation of nanophase goethite. Holocene and Plio-Pleistocene terraces show increasing goethite crystallinity and then replacement of goethite with hematite through time. Hematite in Meridiani spherules also formed during diagenesis, although whether these replaced precursor goethite or precipitated directly from groundwaters is not known. The retention of jarosite and other soluble sulfate salts suggests that water limited the diagenesis of Meridiani rocks. Diverse prokaryotic and eukaryotic microorganisms inhabit acidic and seasonally dry Rio Tinto environments. Organic matter does not persist in Rio Tinto sediments, but biosignatures imparted to sedimentary rocks as macroscopic textures of coated microbial streamers, surface blisters formed by biogenic gas, and microfossils preserved as casts and molds in iron oxides help to shape strategies for astrobiological investigation of Meridiani outcrops.

Fernandez-Remolar, David C.; Morris, Richard V.; Gruener, John E.; Amils, Ricardo; Knoll, Andrew H.

2005-01-01

36

Stratigraphic sequence, elemental concentrations and heavy metal pollution in Holocene sediments from the Tinto-Odiel Estuary, southwestern Spain  

Microsoft Academic Search

The Holocene filling of the Tinto-Odiel Estuary comprises seven lithofacies over a Mio-Pliocene substrate. The sequence includes\\u000a three system tracts: lowstand system (10?000 to 8700 years BP), transgressive system (8700 to 7000 years BP), and regressive\\u000a system (7000 to Recent). Twenty sediment samples from the 50-m borehole were analyzed for their major components and minor\\u000a element concentrations. Two multivariate analysis

F. Ruiz; M. L. González-Regalado; J. Borrego; J. A. Morales; J. G. Pendón; J. M. Muñoz

1998-01-01

37

A study of heavy metal pollution in the Tinto-Odiel estuary in southwestern Spain using factor analysis  

Microsoft Academic Search

The estuary of Odiel and Tinto rivers, located on the southwestern coast of the Iberian Peninsula, receives acidic fluvial\\u000a water discharges with high concentrations of sulphates and heavy metals from these rivers. In addition, a big industrial complex\\u000a which efflues directly on the system is located in the same estuary. The effluents induce the presence in the estuary of high

J. A. Grande; J. Borrego; J. A. Morales

2000-01-01

38

Geometry and genesis of feeder zones of massive sulphide deposits: constraints from the Rio Tinto ore deposit (Spain)  

Microsoft Academic Search

Vein-related data have been collected around the giant Rio Tinto orebody in southern Spain within the root zones of the massive\\u000a sulphide deposits. Here, we report the main results of this study, concerning the geometry of the stockwork and the conditions\\u000a of formation. Although field and thin-section studies have shown that a wide range of vein configurations exist, from micro

P. Nehlig; D. Cassard; E. Marcoux

1997-01-01

39

Tinto Versus Odiel: Two A.M.D. Polluted Rivers and an Unresolved Issue. An Artificial Intelligence Approach  

Microsoft Academic Search

The Iberian Pyrite Belt (SW Spain) is a highly relevant source of Acid Mine Drainage contamination on a global scale. Although\\u000a the Tinto and Odiel Rivers, which cross the Iberian Pyrite Belt, have been widely studied by various authors, an issue is\\u000a still pending: the study of the metal load distribution undergone by each of these rivers and, hence, the

J. A. Grande; J. Aroba; J. M. Andújar; T. Gómez; M. L. de la Torre; J. Borrego; S. Romero; C. Barranco; M. Santisteban

40

Searching for Life Underground: An Analysis of Remote Sensing Observations of a Drill Core from Rio Tinto, Spain for Mineralogical Indications of Biological Activity  

NASA Technical Reports Server (NTRS)

Water is unstable on the surface of Mars, and therefore the Martian surface is not likely to support life. It is possible, however, that liquid water exists beneath the surface of Mars, and thus life might also be found in the subsurface. Subsurface life would most likely be microbial, anaerobic, and chemoautotrophic; these types of biospheres on Earth are rare, and not well understood. Finding water and life are high priorities for Mars exploration, and therefore it is important that we learn to explore the subsurface robotically, by drilling. The Mars Analog Rio Tinto Experiment (MARTE), has searched successfully for a subsurface biosphere at Rio Tinto, Spain [1,2,3,4]. The Rio Tinto study site was selected to search for a subsurface biosphere because the extremely low pH and high concentrations of elements such as iron and copper in the Tinto River suggest the presence of a chemoautotrophic biosphere in the subsurface beneath the river. The Rio Tinto has been recognized as an important mineralogical analog to the Sinus Meridiani site on Mars [5].

Battler, M.; Stoker, C.

2005-01-01

41

Contrasting Microbial Community Assembly Hypotheses: A Reconciling Tale from the Río Tinto  

PubMed Central

Background The Río Tinto (RT) is distinguished from other acid mine drainage systems by its natural and ancient origins. Microbial life from all three domains flourishes in this ecosystem, but bacteria dominate metabolic processes that perpetuate environmental extremes. While the patchy geochemistry of the RT likely influences the dynamics of bacterial populations, demonstrating which environmental variables shape microbial diversity and unveiling the mechanisms underlying observed patterns, remain major challenges in microbial ecology whose answers rely upon detailed assessments of community structures coupled with fine-scale measurements of physico-chemical parameters. Methodology/Principal Findings By using high-throughput environmental tag sequencing we achieved saturation of richness estimators for the first time in the RT. We found that environmental factors dictate the distribution of the most abundant taxa in this system, but stochastic niche differentiation processes, such as mutation and dispersal, also contribute to observed diversity patterns. Conclusions/Significance We predict that studies providing clues to the evolutionary and ecological processes underlying microbial distributions will reconcile the ongoing debate between the Baas Becking vs. Hubbell community assembly hypotheses. PMID:19052647

Palacios, Carmen; Zettler, Erik; Amils, Ricardo; Amaral-Zettler, Linda

2008-01-01

42

Enzyme-Cascade Analysis of the Rio Tinto Subsurface Environment: A Biosensor Experiment  

NASA Technical Reports Server (NTRS)

The Portable Test System (PTS), designed & developed by Charles Rivers Laboratories, Inc. (Charleston, SC) is a portable instrument that was designed to perform analysis of enzymatic assays related to rapid assessment of microbial contamination (Wainwright, 2003). The enzymatic cascade of Limulus Amebocyte Lysate (LAL) is known to be one of the most sensitive techniques available for microbial detection, enabling the PTS to be evaluated as a potential life detection instrument for in situ Astrobiology missions. In the summer of 2003 the system was tested as a part of the Mars Astrobiology Research and Technology Experiment (MARTE) ground truth science campaign in the Rio Tinto Analogue environment near Nerva, Spain. The preliminary results show that the PTS analysis correlates well with the contamination control tests and the more traditional lab-based biological assays performed during the MARTE field mission. Further work will be conducted on this research during a second field campaign in 2004 and a technology demonstration of a prototype instrument that includes autonomous sample preparation will occur in 2005.

McKay, David S.; Lynch, Kennda; Wainwright, Norman; Child, Alice; Williams, Kendra; McKay, David; Amils, Ricardo; Gonzalez, Elena; Stoker, Carol

2004-01-01

43

Microbial community structure across the tree of life in the extreme Río Tinto  

PubMed Central

Understanding biotic versus abiotic forces that shape community structure is a fundamental aim of microbial ecology. The acidic and heavy metal extreme Río Tinto (RT) in southwestern Spain provides a rare opportunity to conduct an ecosystem-wide biodiversity inventory at the level of all three domains of life, because diversity there is low and almost exclusively microbial. Despite improvements in high-throughput DNA sequencing, environmental biodiversity studies that use molecular metrics and consider entire ecosystems are rare. These studies can be prohibitively expensive if domains are considered separately, and differences in copy number of eukaryotic ribosomal RNA genes can bias estimates of relative abundances of phylotypes recovered. In this study we have overcome these barriers (1) by targeting all three domains in a single polymerase chain reaction amplification and (2) by using a replicated sampling design that allows for incidence-based methods to extract measures of richness and carry out downstream analyses that address community structuring effects. Our work showed that combined bacterial and archaeal richness is an order of magnitude higher than eukaryotic richness. We also found that eukaryotic richness was highest at the most extreme sites, whereas combined bacterial and archaeal richness was highest at less extreme sites. Quantitative community phylogenetics showed abiotic forces to be primarily responsible for shaping the RT community structure. Canonical correspondence analysis revealed co-occurrence of obligate symbionts and their putative hosts that may contribute to biotic forces shaping community structure and may further provide a possible mechanism for persistence of certain low-abundance bacteria encountered in the RT. PMID:20631808

Amaral-Zettler, Linda A; Zettler, Erik R; Theroux, Susanna M; Palacios, Carmen; Aguilera, Angeles; Amils, Ricardo

2011-01-01

44

Microbial community structure across the tree of life in the extreme Río Tinto.  

PubMed

Understanding biotic versus abiotic forces that shape community structure is a fundamental aim of microbial ecology. The acidic and heavy metal extreme Río Tinto (RT) in southwestern Spain provides a rare opportunity to conduct an ecosystem-wide biodiversity inventory at the level of all three domains of life, because diversity there is low and almost exclusively microbial. Despite improvements in high-throughput DNA sequencing, environmental biodiversity studies that use molecular metrics and consider entire ecosystems are rare. These studies can be prohibitively expensive if domains are considered separately, and differences in copy number of eukaryotic ribosomal RNA genes can bias estimates of relative abundances of phylotypes recovered. In this study we have overcome these barriers (1) by targeting all three domains in a single polymerase chain reaction amplification and (2) by using a replicated sampling design that allows for incidence-based methods to extract measures of richness and carry out downstream analyses that address community structuring effects. Our work showed that combined bacterial and archaeal richness is an order of magnitude higher than eukaryotic richness. We also found that eukaryotic richness was highest at the most extreme sites, whereas combined bacterial and archaeal richness was highest at less extreme sites. Quantitative community phylogenetics showed abiotic forces to be primarily responsible for shaping the RT community structure. Canonical correspondence analysis revealed co-occurrence of obligate symbionts and their putative hosts that may contribute to biotic forces shaping community structure and may further provide a possible mechanism for persistence of certain low-abundance bacteria encountered in the RT. PMID:20631808

Amaral-Zettler, Linda A; Zettler, Erik R; Theroux, Susanna M; Palacios, Carmen; Aguilera, Angeles; Amils, Ricardo

2011-01-01

45

Prokaryotic community composition and ecology of floating macroscopic filaments from an extreme acidic environment, Río Tinto (SW, Spain).  

PubMed

The prokaryotic diversity of macroscopic filaments located at the water surface in an extreme acidic environment, Río Tinto (SW, Spain), has been analysed through denaturing gradient gel electrophoresis (DGGE), cloning of 16S rRNA genes and fluorescence in situ hybridization (FISH). The dominant species present in the macrofilaments were Acidithiobacillus ferrooxidans, Leptospirillum ferrooxidans and Acidiphilium spp., which represented the three main bacterial genera found in the water column of the river. However, our results also showed the presence of other microorganisms not previously detected in the Río Tinto. Within the Gammaproteobacteria class, sequences closely related to the iron-oxidizing bacteria WJ2 and DSM 2392 were found, as well as sequences related to the non-acidophilic genera Aeromonas and Acinetobacter. In addition, two other new phylotypes related to Gram-positive species from the genera Desulfosporosinus, Clostridium and Mycobacterium were identified. The presence of these anaerobic microorganisms strongly suggests that the filaments could originate in the deeper parts of the river as a typical acid streamer attached to the rocks or the sediments and be pulled up towards the surface when they reach certain buoyancy. PMID:17950555

García-Moyano, A; González-Toril, E; Aguilera, A; Amils, R

2007-12-01

46

Acid mine drainage pollution in the Tinto and Odiel rivers (Iberian Pyrite Belt, SW Spain) and bioavailability of the transported metals to the Huelva Estuary  

Microsoft Academic Search

The Tinto and Odiel rivers are seriously affected by acid mine drainage (AMD) from the long-term mining activities in Iberian Pyrite Belt (IPB). As a consequence, the Huelva estuary is heavily contaminated by metals and metalloids. This study presents an estimation of the seasonal variation, and the dissolved contaminant load transported by both rivers from February 2002 to September 2004.

José Miguel Nieto; Aguasanta M. Sarmiento; Manuel Olías; Carlos R. Canovas; Inmaculada Riba; Judit Kalman; T. Angel Delvalls

2007-01-01

47

Mineralogical In-Situ Investigation of Acid-Sulfate Samples from the Rio Tinto River, Spain, with a Portable XRD/XRF Instrument  

NASA Astrophysics Data System (ADS)

The CheMin 4 XRD/XRF prototype was deployed in Rio Tinto, Spain, for a field campaign to study river bed sediments and test the potential of an instrument suite in an astrobiological investigation context for future Mars surface robotic missions.

Sarrazin, P.; Ming, D. W.; Morris, R. V.; Fernández-Remolar, D.; Amils, R.; Arvidson, R. E.; Blake, D.; Bish, D. L.

2007-03-01

48

Metal biogeochemistry in the Tinto?Odiel rivers (Southern Spain) and in the Gulf of Cadiz: a synthesis of the results of TOROS project  

NASA Astrophysics Data System (ADS)

TOROS (Tinto-Odiel-River-Ocean Study) has been studying the biogeochemical processes which control metals and nutrients cycling in the mixing zone of the Tinto and Odiel rivers (SW Spain) and has established the fate of metals in the Gulf of Cadiz in relation to hydrodynamics and biological activity. The Tinto and Odiel rivers are small, with a combined mean discharge of 18 m 3/s. They drain the largest sulphide mineralisation in the world. Predominantly, Zn-Cu-Pb mineralisation has been worked since 2500 yr BC. The estuarine zone includes both an extensive area of salt marsh and an intensively industrialised urban area. As a consequence of pyrite oxidation, the Tinto and Odiel rivers are strongly acidic (pH<3) with extremely high and variable metal concentrations. Transition metals are poorly removed from the water column in the mixing zone. Moreover, drainage from large phosphogypsum waste deposits contributes to As, Hg, U and phosphate contamination of the estuary. The collapse of the tailing reservoir at los Frailes in 1998 had not impacted the chemistry of the coastal waters up to 6 months later. A large plume of metal-rich waters due to the Tinto and Odiel discharges occurs along the coast of the Gulf of Cadiz. This plume affects seasonally the Atlantic inflow through the Strait of Gibraltar. The dispersion of the metal discharges has been simulated by injection of a tracer in the 3-D hydrodynamical model. Both model and field study clearly show the inflow of metal contaminated Spanish Shelf Water through the Strait of Gibraltar.

Elbaz-Poulichet, Françoise; Braungardt, Charlotte; Achterberg, Eric; Morley, Nicholas; Cossa, Daniel; Beckers, Jean-Marie; Nomérange, Philippe; Cruzado, Antonio; Leblanc, Marc

2001-12-01

49

Río Tinto sedimentary mineral assemblages: A terrestrial perspective that suggests some formation pathways of phyllosilicates on Mars  

NASA Astrophysics Data System (ADS)

The presence of extensive phyllosilicate deposits from the early Noachian of Mars are often interpreted as having formed from neutral to subalkaline solutions. In this paper we examine the Río Tinto fluvial basin, an early Mars analog, that hosts clay production and sedimentation along the entire course of the river. At Río Tinto, phyllosilicate minerals including clays and micas are sourced by volcanosedimentary bedrock of rhyolitic and andesitic composition affected by Carboniferous hydrothermal alteration. Pleistocene to modern acidic weathering of those materials chemically altered the volcanic and sedimentary materials to K/Na-clay-(montmorillonite/smectites)-kaolinite assemblages in paleosoils and fractures while physical weathering degrades phyllosilicates more resistant to acidic attack. During the wet season, phyllosilicates are eroded, transported and deposited from both acidic headwaters and neutral tributaries. During the dry season, sulfates and nanophase oxyhydroxides co-precipitate. Late summer storms that cause fast flooding events mix illite, quartz, feldspars, iron oxides and other minerals in fluvial deposits where these minerals are stabilized and aggrade until the following wet season. As a result, chemical precipitates, primary phyllosilicates and secondary clays form mineral admixtures that explain the compositional diversity of the fluvial deposits. These deposits reveal the persistence of smectites, whose occurrence is explained given that the reaction kinetics under acidic conditions of degradation is lowered by seasonal discharges of the river. The longevity of phyllosilicate minerals within fluvial deposits depends on climatic and geochemical conditions and processes which are in turn are correlated to temperature, persistence of water, hydrological cycling, hydrogeochemistry and composition of the source materials in the basement. These parameters are universal and have to be characterized in order to understand the distribution of mineral composition on any planetary surface, including Mars.

Fernández-Remolar, D. C.; Prieto-Ballesteros, O.; Gómez-Ortíz, D.; Fernández-Sampedro, M.; Sarrazin, P.; Gailhanou, M.; Amils, R.

2011-01-01

50

Mars Analog Research and Technology Experiment (MARTE): A Simulated Mars Drilling Mission to Search for Subsurface Life at the Rio Tinto, Spain  

NASA Technical Reports Server (NTRS)

The MARTE (Mars Astrobiology Research and Technology Experiment) project was selected by the new NASA ASTEP program, which supports field experiments having an equal emphasis on Astrobiology science and technology development relevant to future Astrobiology missions. MARTE will search for a hypothesized subsurface anaerobic chemoautotrophic biosphere in the region of the Tinto River in southwestern Spain while also demonstrating technology needed to search for a subsurface biosphere on Mars. The experiment is informed by the strategy for searching for life on Mars.

Stoker, Carol; Lemke, Larry; Mandell, Humboldt; McKay, David; George, Jeffrey; Gomez-Alvera, Javier; Amils, Ricardo; Stevens, Todd; Miller, David

2003-01-01

51

RIO Tinto Faulted Volcanosedimentary Deposits as Analog Habitats for Extant Subsurface Biospheres on Mars: A Synthesis of the MARTE Drilling Project Geobiology Results  

NASA Technical Reports Server (NTRS)

Geochemistry and mineralogy on Mars surface characterized by the MER Opportunity Rover suggest that early Mars hosted acidic environments in the Meridiani Planum region [1, 2]. Such extreme paleoenvironments have been suggested to be a regional expression of the global Mars geological cycle that induced acidic conditions by sulfur complexation and iron buffering of aqueous solutions [3]. Under these assumptions, underground reservoirs of acidic brines and, thereby, putative acidic cryptobiospheres, may be expected. The MARTE project [4, 5] has performed a drilling campaign to search for acidic and anaerobic biospheres in R o Tinto basement [6] that may be analogs of these hypothetical communities occurring in cryptic habitats of Mars. This Rio Tinto geological region is characterized by the occurrence of huge metallic deposits of iron sulfides [7]. Late intensive diagenesis of rocks driven by a compressive regimen [8] largely reduced the porosity of rocks and induced a cortical thickening through thrusting and inverse faulting and folding. Such structures play an essential role in transporting and storing water underground as any other aquifers do in the Earth. Once the underground water reservoirs of the Ro Tinto basement contact the hydrothermal pyrite deposits, acidic brines are produced by the release of sulfates and iron through the oxidation of sulfides [9].

Fernandez-Remolar, D. C.; Prieto-Ballesteros, O.; Rodriquez, N.; Davila, F.; Stevens, T.; Amils, R.; Gomez-Elvira, J.; Stoker, C.

2005-01-01

52

Trace metal partitioning over a tidal cycle in an estuary affected by acid mine drainage (Tinto estuary, SW Spain).  

PubMed

The Tinto River estuary is highly polluted with the acid lixiviates from old sulphide mines. In this work the behaviour of dissolved and particulate trace metals under strong chemical gradients during a tidal cycle is studied. The pH values range from 4.4 with low tide to 6.9 with high tide. Precipitation of Fe and Al is intense during rising tides and As and Pb are almost exclusively found in the particulate matter (PM). Sorption processes are very important in controlling the mobility (and hence bioavailability) of some metals and particularly affect Cu below pH 6. Above pH~6 Cu is desorbed, probably by the formation of Cu(I)-chloride complexes. Although less pronounced than Cu, also Zn desorption above pH 6.5 seems to occur. Mn and Co are affected by sorption processes at pH higher than ca. 6. Cd behaves conservatively and Ni is slightly affected by sorption processes. PMID:25112821

Hierro, A; Olías, M; Cánovas, C R; Martín, J E; Bolivar, J P

2014-11-01

53

Assessment of phosphogypsum impact on the salt-marshes of the Tinto river (SW Spain): role of natural attenuation processes.  

PubMed

About 120 Mton of phosphogypsum from the fertiliser industry were stack-piled on the salt-marshes of the Tinto river (Spain). This paper investigates the capacity of salt-marshes to attenuate contamination due to downward leaching from phosphogypsum. Solids and pore-waters were characterized at different depths of the pile to reach the marsh-ground. In superficial zones, metals were highly mobile, and no reduced sulphur was found. However, pollutant concentration decreased in the pore-water in deeper oxygen-restricted zones. Metal removal occurred by precipitation of newly formed sulphides, being this process main responsible for the contamination attenuation. Pyrite-S was the main sulphide component (up to 2528 mg/kg) and occurred as framboids, leading to high degrees of pyritization (up to 97%). The sulphidization reaction is Fe-limited; however, excess of acid-volatile sulphide over other metals cause precipitation of other sulphides, mainly of Cu and As. This decrease in metal mobility significantly minimises the impact of phosphogypsums on the salt-marshes. PMID:21992931

Pérez-López, Rafael; Castillo, Julio; Sarmiento, Aguasanta M; Nieto, José M

2011-12-01

54

Classification of Modern and Old Río Tinto Sedimentary Deposits Through the Biomolecular Record Using a Life Marker Biochip: Implications for Detecting Life on Mars  

NASA Astrophysics Data System (ADS)

The particular mineralogy formed in the acidic conditions of the Río Tinto has proven to be a first-order analogue for the acid-sulfate aqueous environments of Mars. Therefore, studies about the formation and preservation of biosignatures in the Río Tinto will provide insights into equivalent processes on Mars. We characterized the biomolecular patterns recorded in samples of modern and old fluvial sediments along a segment of the river by means of an antibody microarray containing more than 200 antibodies (LDCHIP200, for Life Detector Chip) against whole microorganisms, universal biomolecules, or environmental extracts. Samples containing 0.3-0.5g of solid material were automatically analyzed in situ by the Signs Of LIfe Detector instrument (SOLID2), and the results were corroborated by extensive analysis in the laboratory. Positive antigen-antibody reactions indicated the presence of microbial strains or high-molecular-weight biopolymers that originated from them. The LDCHIP200 results were quantified and subjected to a multivariate analysis for immunoprofiling. We associated similar immunopatterns, and biomolecular markers, to samples with similar sedimentary age. Phyllosilicate-rich samples from modern fluvial sediments gave strong positive reactions with antibodies against bacteria of the genus Acidithiobacillus and against biochemical extracts from Río Tinto sediments and biofilms. These samples contained high amounts of sugars (mostly polysaccharides) with monosaccharides like glucose, rhamnose, fucose, and so on. By contrast, the older deposits, which are a mix of clastic sands and evaporites, showed only a few positives with LDCHIP200, consistent with lower protein and sugar content. We conclude that LDCHIP200 results can establish a correlation between microenvironments, diagenetic stages, and age with the biomarker profile associated with a sample. Our results would help in the search for putative martian biomarkers in acidic deposits with similar diagenetic maturity. Our LDCHIP200 and SOLID-like instruments may be excellent tools for the search for molecular biomarkers on Mars or other planets.

Parro, Victor; Fernández-Remolar, David; Rodríguez-Manfredi, José A.; Cruz-Gil, Patricia; Rivas, Luis A.; Ruiz-Bermejo, Marta; Moreno-Paz, Mercedes; García-Villadangos, Miriam; Gómez-Ortiz, David; Blanco-López, Yolanda; Menor-Salván, César; Prieto-Ballesteros, Olga; Gómez-Elvira, Javier

2011-01-01

55

The subsurface geology of Río Tinto: material examined during a simulated Mars drilling mission for the Mars Astrobiology Research and Technology Experiment (MARTE).  

PubMed

The 2005 Mars Astrobiology Research and Technology Experiment (MARTE) project conducted a simulated 1-month Mars drilling mission in the Río Tinto district, Spain. Dry robotic drilling, core sampling, and biological and geological analytical technologies were collectively tested for the first time for potential use on Mars. Drilling and subsurface sampling and analytical technologies are being explored for Mars because the subsurface is the most likely place to find life on Mars. The objectives of this work are to describe drilling, sampling, and analytical procedures; present the geological analysis of core and borehole material; and examine lessons learned from the drilling simulation. Drilling occurred at an undisclosed location, causing the science team to rely only on mission data for geological and biological interpretations. Core and borehole imaging was used for micromorphological analysis of rock, targeting rock for biological analysis, and making decisions regarding the next day's drilling operations. Drilling reached 606 cm depth into poorly consolidated gossan that allowed only 35% of core recovery and contributed to borehole wall failure during drilling. Core material containing any indication of biology was sampled and analyzed in more detail for its confirmation. Despite the poorly consolidated nature of the subsurface gossan, dry drilling was able to retrieve useful core material for geological and biological analysis. Lessons learned from this drilling simulation can guide the development of dry drilling and subsurface geological and biological analytical technologies for future Mars drilling missions. PMID:19105757

Prieto-Ballesteros, Olga; Martínez-Frías, Jesús; Schutt, John; Sutter, Brad; Heldmann, Jennifer L; Bell, Mary Sue; Battler, Melissa; Cannon, Howard; Gómez-Elvira, Javier; Stoker, Carol R

2008-10-01

56

Chemical and Isotopic Characterization of Waters in Rio Tinto, Spain, Shows Possible Origin of the Blueberry Haematite Nodules in Meridiani Planum, Mars  

NASA Astrophysics Data System (ADS)

Meridiani Planum sediments formed in an acid environment and include jarosite and other evaporitic sulfate minerals. Nodular spheroidal concretions appear to have grown in situ and are predominantly hematite. The source of the Rio Tinto, S. Spain, drains an area of extensive sulfide mineralization and is dominated by acid mine drainage processes. The system is not a Mars analog but potentially similar processes of sulfide oxidation produce sulfate rich waters which feed into the river and precipitate a large range of evaporitic sulfates including jarosite. Iron oxide minerals associated with the evaporites are either dispersed or bedded but not nodular. The water compositions appear to be mixtures of a few discreet end-members: the two most significant occur in undiluted form as inputs to the river and are relevant to many such systems. They both have all sulfur totally oxidized as sulfate. The first is a bright red water, pH ~1.5, Fe/S 0.5 and 23 g/L iron which is greater than 95% Fe3+. Its sulfate oxygen isotope composition is +2‰SMOW and about +7‰, relative to the water O isotope composition. These data indicate pyrite oxidation by Fe3+ with O in sulfate coming mainly from water. The second end-member is a pale green water, pH ~0.7, Fe/S 0.7, 50 g/L iron present mainly as Fe2+ and O isotope composition of sulfate about +6‰SMOW , about +12.5‰ relative to the water O value. Oxygen in sulfate comes mainly from atmospheric oxygen resulting from pyrite oxidation by molecular oxygen dissolved in water. Although the Rio Tinto system reactions probably are microbiologically mediated (relevant genera have been identified there) similar processes could occur abiotically but more slowly. Meridiani Planum sediments and nodules can be described by a plausible set of similar end-member processes. The primary source of sulfate is oxidation of sulfides present in basalt (pyrite, FeS2 or pyrrhotite, FeS) and weathering would have produced oxidized sulfate rich solutions at low pH. Ground water migration could produce evaporitic ponds where various bedded sulfate mineral sediments could form. The intergranular pore-spaces would be water filled. Most terrestrial spheroidal nodular concretions form by radial diffusion in pore-water of a chemical component of a very different oxidation state from that of the surrounding water. A nodular concretion is most usually formed by the reaction of the diffusive component with others in the pore-water. There are two main possible reaction sets for formation of the Blueberries that are consistent with all current data. 1. Local concentrations of organic matter (pre-biotic or biotic) formed reduction spots in which a small amount of Fe3+ either in solution or from evaporite mineral salts, was reduced to Fe2+ and then diffused radially to form an iron oxide nodule by reaction with inwardly diffusing dissolved oxygen. 2. Similar local concentrations of organic matter could also have engendered sulfate reduction and consequent outward diffusion of dissolved sulfide reacted with iron in solution to produce an iron sulfide nodule, subsequently oxidized in situ to hematite (maybe via goethite). Our current work is successfully identifying chemical and stable isotopic characteristics for both microbial and abiotic modes of all relevant reactions.

Coleman, M. L.; Hubbard, C. G.; Mielke, R. E.; Black, S.

2005-12-01

57

PARA EL BOSQUE CHIQUITANO  

Microsoft Academic Search

Durante los últimos años se han desarrollado acciones tanto regulatorias como correctoras, para frenar la progresiva pérdida de cobertura boscosa. Sin embargo, estas acciones no alcanzaron los niveles de efectividad esperados debido principalmente a los incentivos económicos que conducen a la población a desmontar los bosques para desarrollar actividades relacionadas principalmente con la producción agropecuaria. A través del presente documento,

Alfonso F. Malky Harb; Medio Ambiente

58

Challenge and Changes to Tinto's Persistence Theory: A Historical Review  

ERIC Educational Resources Information Center

In an effort to demonstrate the complexities of accountability issues and institutional effectiveness, a 30-year review of persistence literature provides evidence of the numerous studies and emerging research on student persistence. Although Astin's (1975) groundbreaking research of access and persistence provides a framework for future…

Metz, George W.

2004-01-01

59

Tomografía computarizada (TC) y exploraciones para cáncer  

Cancer.gov

Hoja informativa que describe el procedimiento y la tecnología de exploraciones con tomografía computarizada así como sus usos para el diagnóstico, para exámenes de detección y para tratamiento del cáncer.

60

Pruebas genéticas para síndromes hereditarios de cáncer  

Cancer.gov

Hoja informativa sobre pruebas genéticas para riesgos heredados de cáncer; incluye tipos de pruebas, para quién están indicadas y explicación y confidencialidad de los resultados. Ofrece información de pruebas genéticas a domicilio o pruebas para el consumidor.

61

Prmio para trs novas aplicaes  

E-print Network

Prémio para três novas aplicações Tecnologia. A "wiride" venceu o "Lisbon Big Apps", concurso de Instituto Superior Técnico que desenvolveu o projeto, citada pelo/dAT, a "wiride" é uma nova forma de andar

Instituto de Sistemas e Robotica

62

AYUDA PARA INVIDENTES UTILIZANDO TELEFONOS  

E-print Network

´on, aplicaci´on para m´oviles, c´odigo, base de da- tos,dpi (puntos por pulgada, dots per inch),layout,GPS. III #12;IV #12;Abstract Abstract The purpose of this project is to develop three smartphone apps in two of the most used moblie O.S: Android and iOS. This project has three apps: two developed in Android and one

Autonoma de Madrid, Universidad

63

PREPARE UN EQUIPO PORTTIL PARA EMERGENCIAS Prepare un equipo portatil para emergencias de modo que pueda  

E-print Network

PREPARE UN EQUIPO PORTÁTIL PARA EMERGENCIAS Prepare un equipo portatil para emergencias de modo que libre) 2. Equipos medicos caseros (ejemplos: medidor de glucosa, monitor de presion arterial, baston

64

Taller de Ciencia para Jvenes para alumnos de bachillerato San Cristobal de las Casas, Chiapas  

E-print Network

Taller de Ciencia para Jóvenes para alumnos de bachillerato San Cristobal de las Casas, Chiapas 3-7 agosto, 2009 CONVOCATORIA El "Taller de Ciencia para Jóvenes" en San Cristobal de las Casas (Chiapas), está dirigido a los alumnos de escuelas de nivel bachillerato que se sienten atraidos a las ciencias

Bor, Gil

65

CURSO DE MUSICALIZAÇÃO PARA BEBÊS DA UFBA  

Microsoft Academic Search

RESUMO: Considerando a importância da Educação Musical na primeira infância e os benefícios que esta pode trazer, este artigo tem o intuito de descrever e analisar os resultados do primeiro semestre do curso de musicalização para bebês na UFBA, que teve início em setembro de 2006, contemplando crianças com idades entre 0 e 4 anos, acompanhadas de seus responsáveis. Para

Angelita Maria Vander Broock

66

Semntica Operacional para la Programacin en Lgica  

E-print Network

(S)], [Y, a] } = { [S, g(X)] } Sustituciones Unificadoras y m.g.u./s Def: Sea S un conjunto de términos verifica que para todo otro unificador para S, existe una sustitución tal que = . Sust. Unif. y m.g.u./s

Simari, Guillermo R.

67

Doutorados, para qu ? Paulo J. Ferreira  

E-print Network

1 Doutorados, para quê ? Paulo J. Ferreira Massachusetts Institute of Technology (MIT) Department of Materials Science and Engineering Cambridge, MA, 02139, USA, ferreira@mit.edu Um engenheiro recém

Ferreira, Paulo J.

68

Esta Preparado? Gua para los Tejanos en  

E-print Network

pilas con pilas adicionales para durar varios días ___ Linternas de pilas con pilas adicionales ___ Agua huracanes, aún así pueden causar la muerte debido a lluvias torrenciales, inundaciones, y tornados que los

69

Consejos para pacientes que reciben radioterapia  

Cancer.gov

Serie de nueve (9) hojas sobre los efectos secundarios de la radioterapia. Cada hoja contiene recomendaciones y sugerencias prácticas para ayudarle a controlar los efectos secundarios durante la radioterapia, y a que se sienta mejor durante el tratamiento.

70

Proyecto para desarrollar un 'Teatro Popular Identificador'.  

E-print Network

se encargue de ellos en los infiernos. . . . RAÍCES PARA UN TEATRO NACIONAL POPULAR. La diversidad de elementos teatrales existentes en las farsas carnavalescas de la Costa Atlántica y otras regiones del país —Blancos y Negros en Pasto y Tumaco...

Zapata Olivella, Manuel

1975-10-01

71

Consejos para pacientes que reciben quimioterapia  

Cancer.gov

Serie de dieciocho (18) hojas sobre los efectos secundarios de la quimioterapia. Cada hoja contiene recomendaciones y sugerencias prácticas para ayudarle a controlar los efectos secundarios durante la quimioterapia, y a que se sienta mejor durante el tratamiento.

72

DOCUMENTAO PARA INGRESSO POR TRANSFERNCIA EXTERNA  

E-print Network

1 DOCUMENTA��O PARA INGRESSO POR TRANSFER�NCIA EXTERNA (BRASIL) PERÍODO 2013.2 PRAZO PARA REQUERER a convalidação dos estudos concedida pela Secretaria Estadual de Educação, no Brasil. Se o Ensino Médio foi; - Certificado de Dispensa de Incorporação; - CPF; 4 - Originais (assinados e carimbados) dos seguintes

73

DOCUMENTAO PARA INGRESSO POR TRANSFERNCIA EXTERNA  

E-print Network

1 DOCUMENTA��O PARA INGRESSO POR TRANSFER�NCIA EXTERNA (BRASIL) PERÍODO 2014.1 PRAZO PARA REQUERER deverá entregar a convalidação dos estudos concedida pela Secretaria Estadual de Educação, no Brasil. Se aceita) - Título de Eleitor; - Certificado de Dispensa de Incorporação; - CPF; 4 - Originais (assinados e

74

EDITAL COMPLETO PARA INGRESSO POR TRANSFERNCIA EXTERNA  

E-print Network

1 EDITAL COMPLETO PARA INGRESSO POR TRANSFER�NCIA EXTERNA (BRASIL) PERÍODO 2014.1 PRAZO PARA deverá entregar a convalidação dos estudos concedida pela Secretaria Estadual de Educação, no Brasil. Se aceita) - Título de Eleitor; #12;2 - Certificado de Dispensa de Incorporação; - CPF; 4 - Originais

75

NORMAS GERAIS PARA INGRESSO POR TRANSFERNCIA EXTERNA  

E-print Network

1 NORMAS GERAIS PARA INGRESSO POR TRANSFER�NCIA EXTERNA (BRASIL) PERÍODO 2013.1 PRAZO PARA REQUERER deverá entregar a convalidação dos estudos concedida pela Secretaria Estadual de Educação, no Brasil. Se aceita) - Título de Eleitor; - Certificado de Dispensa de Incorporação; - CPF; #12;2 4 - Originais

76

NORMAS GERAIS PARA INGRESSO POR TRANSFERNCIA EXTERNA  

E-print Network

1 NORMAS GERAIS PARA INGRESSO POR TRANSFER�NCIA EXTERNA (BRASIL) PERÍODO 2013.2 PRAZO PARA REQUERER deverá entregar a convalidação dos estudos concedida pela Secretaria Estadual de Educação, no Brasil. Se aceita) - Título de Eleitor; - Certificado de Dispensa de Incorporação; - CPF; #12;2 4 - Originais

77

Software Libre para ensear o aprender Matemtica  

E-print Network

Software Libre para enseñar o aprender Matemática Porqué y Cómo Pablo De Nápoli pdenapo@dm.uba.ar #12;Introducción · En esta charla, presentaremos algunos de los pogramas que son software libre, que ventajas de utilizar software libre para la docencia y la investigación en matemática. #12;¿Por qué

De Nápoli, Pablo Luis

78

Teorema de Linearizacao para Fluxo Fuzzy  

Microsoft Academic Search

O objetivo deste trabalhoe estudar os sis- temas dinamicos fuzzy associados a sistemas de- termin´õsticos autonomos. O Princ´õpio de Ex- tensao de Zadehe utilizado para se obter o fluxo fuzzy de tais sistemas. ´ E apresentado um teorema de linearizacao fuzzy, como uma gen- eralizacao do Teorema de Grobman-Hartman, para a caracterizacao da estabilidade local dos equil´õbrios dos sistemas fuzzy

Marina T. Mizukoshi; Laecio C. Barros; Rodney C. Bassanezi

79

Tecnologa para todos Sistema Inalmbrico de Rice  

E-print Network

Tecnología para todos Sistema Inalámbrico de Rice Andrea Trevino Rice University http://www.techforall.org/tfa_wireless.html http://tfa.rice.edu #12;Por qué en Pecan Park? La Misión de TFA: Proporcionar conocimientos a la comunidad. El propósito de Rice: Usar este programa para explorar la siguiente generación del sistema

80

Searching for an Acidic Aquifer in the Rio Tinto Basin: First Geobiology Results of MARTE Project  

NASA Technical Reports Server (NTRS)

Among the conceivable modern habitats to be explored for searching life on Mars are those potentially developed underground. Subsurface habitats are currently environments that, under certain physicochemical circumstances, have high thermal and hydrochemical stability [1, 2]. In planets like Mars lacking an atmospheric shield, such systems are obviously protected against radiation, which strongly alters the structure of biological macromolecules. Low porosity but fractured aquifers currently emplaced inside ancient volcano/sedimentary and hydrothermal systems act as excellent habitats [3] due to its thermal and geochemical properties. In these aquifers the temperature is controlled by a thermal balance between conduction and advection processes, which are driven by the rock composition, geological structure, water turnover of aquifers and heat generation from geothermal processes or chemical reactions [4]. Moreover, microbial communities based on chemolithotrophy can obtain energy by the oxidation of metallic ores that are currently associated to these environments. Such a community core may sustain a trophic web composed of non-autotrophic forms like heterotrophic bacteria, fungi and protozoa.

Fernandez-Remolar, D. C.; Prieto-Ballesteros, O.; Stoker, C.

2004-01-01

81

El Libro de la Escritura por Pinguino Tinto (The Writing Book, by Inky Penguin).  

ERIC Educational Resources Information Center

Presented completely in Spanish and intended for elementary level students, this book offers 12 writing ideas and several suggestions on how students can make a book using their writing. Each writing idea is presented with a brief description (addressed to the student), several examples of student writing, and a blank page on which to write.…

Padgett, Ron

82

Geological record of an acidic environment driven by iron hydrochemistry: The Tinto River system  

Microsoft Academic Search

The existence of possible hematitic strata on the surface of Mars demands a search for terrestrial analogues formed in unusual environments. This will help us to recognize and interpret environmental and, perhaps, biological signatures preserved in Mars' hematites. Such an analogue would allow us to establish valid reference systems based on geomicrobial and biogeochemical signatures. Two different aspects place the

David C. Fernández-Remolar; Nuria Rodriguez; Felipe Gómez; Ricardo Amils

2003-01-01

83

The ParaScope parallel programming environment  

NASA Technical Reports Server (NTRS)

The ParaScope parallel programming environment, developed to support scientific programming of shared-memory multiprocessors, includes a collection of tools that use global program analysis to help users develop and debug parallel programs. This paper focuses on ParaScope's compilation system, its parallel program editor, and its parallel debugging system. The compilation system extends the traditional single-procedure compiler by providing a mechanism for managing the compilation of complete programs. Thus, ParaScope can support both traditional single-procedure optimization and optimization across procedure boundaries. The ParaScope editor brings both compiler analysis and user expertise to bear on program parallelization. It assists the knowledgeable user by displaying and managing analysis and by providing a variety of interactive program transformations that are effective in exposing parallelism. The debugging system detects and reports timing-dependent errors, called data races, in execution of parallel programs. The system combines static analysis, program instrumentation, and run-time reporting to provide a mechanical system for isolating errors in parallel program executions. Finally, we describe a new project to extend ParaScope to support programming in FORTRAN D, a machine-independent parallel programming language intended for use with both distributed-memory and shared-memory parallel computers.

Cooper, Keith D.; Hall, Mary W.; Hood, Robert T.; Kennedy, Ken; Mckinley, Kathryn S.; Mellor-Crummey, John M.; Torczon, Linda; Warren, Scott K.

1993-01-01

84

São conhecidos os sete parâmetros da textualidade , propostos em Beaugrande 1980 e desenvolvidos em Beaugrande & Dressler 1981: por um lado, um conjunto de parâmetros associados a circunstâncias de produção e de recepção dos textos (intencionalidade , aceitabilidade , informatividade , situacionalidade e intertextualidade ); por outro, coesão e coerência , entendidas como propriedades centradas no próprio  

Microsoft Academic Search

texto 1 . Esta perspectiva - que constituiu, inequivocamente, um contributo fundamental para a descrição linguística dos textos - pode hoje ser retomada e desenvolvida em função de aspectos que têm entretanto sido sublinhados por outros autores. É o caso da noção de plano de texto , desenvolvida nomeadamente por Jean-Michel Adam 2 : recuperando e actualizando a dispositio da

Maria Antónia Coutinho

85

Bolseiros em protesto. "Para a banca milhes,  

E-print Network

segunda vez a candida- tura a bolsa de doutoramento. Em 179 candidatos entraram 12. Ele era o 14.° e acha para os animais já houve dificuldades", diz. David Gomes e Ana Silva, de 23 e 24 anos, estão a começar

Instituto de Sistemas e Robotica

86

DOCUMENTAO PARA INGRESSO POR TRANSFERNCIA EXTERNA  

E-print Network

aceita); - Título de Eleitor; - Certificado de Dispensa de Incorporação; - CPF. Se candidato estrangeiro: - Certidão de Nascimento ou Casamento com tradução juramentada; - Carteira de Identidade; - CPF; - Passaporte de Dispensa de Incorporação (Apenas para alunos brasileiros) - Cópia do CPF - Cópia do Passaporte com

87

Siete principios psicosociales para explicar el terrorismo  

Microsoft Academic Search

Este artículo describe las bases para una aproximación psicosocial al análisis de los fenómenos terro- ristas. Más concretamente, se exponen siete principios explicativos del terrorismo que sean congruen- tes con los supuestos metateóricos y el cuerpo de conocimientos propios de la Psicología social. Des- de esta óptica el terrorismo se concibe como una estrategia de influencia sociopolítica. Los atributos psicológicos

Luis de la Corte; Arie Kruglanski; Jesús de Miguel; José Manuel Sabucedo; Darío Díaz

2007-01-01

88

CUATRO PREGUNTAS PARA INICIARSE EN CAMBIO ORGANIZACIONAL  

Microsoft Academic Search

RESUMEN El presente artículo llega a un concepto sobre el cambio organizacional a partir de las respuestas que ofrece a cuatro preguntas: ¿Qué es lo que cambia en las organizaciones?, ¿Por qué cambian las organizaciones?, ¿Cómo cambian las organizaciones? y -entonces- ¿Qué es el cambio organizacional? Para lograr el propósito se toma como objeto a las organizaciones empresariales y se

Carlos A. Acosta

2002-01-01

89

Gua para Estudiantes Internacionales International Student Guide  

E-print Network

derecho y hasta un cuarto de computadores exclusivo para estudiantes de postgrado en derecho. Los Informática de la Salud l Salud Pública y Promoción de la Salud l Psicología Derecho Criminalística l Derecho Marítimo Internacional l Derecho Comercial Internacional l Derecho Comercial Internacional y Derecho

Martin, Ralph R.

90

Contributo Allo Studio Sistematico ed Ecologico Della Luzula Calabra Ten. dell'Altipiano Silano  

Microsoft Academic Search

Contribution to the systematics and ecology of LUZULA CALABRA Ten. of the Silan highland (Calabria, Southern Italy). — The Luzula calabra Ten. represents a known type endemic to the Silan highland.Some authors regard it as a species in itself, others include it as a variety in the Luzula campestris Lam. et DC. cycle.Therefore, in view of the fact that the

Fernando Migliaccio

1964-01-01

91

Pensar a natureza e o ambiente - alguns contributos a partir da Teoria das Representações Sociais  

Microsoft Academic Search

Resumo Este artigo apresenta dois estudos conduzidos em Portugal, sob a orientação da Teoria das Representações Sociais (TRS), que analisaram como os portugueses pensam e falam sobre o ambiente e a natureza. É primeiro apresentada uma perspectiva geral do campo de estudos das crenças e atitudes em relação ao ambiente e à natureza e são esboçadas as ideias da TRS

Paula Castro

2003-01-01

92

PROJECTO LEXNET OLHA PARA AS REDES WIRELESS  

E-print Network

PROJECTO LEXNET OLHA PARA AS REDES WIRELESS As radiações provocadas pelas redes sem fios estão. PAG. 6 #12;Radiações das redes wireless debaixo de olho O projecto europeu Lexnet tem como objectivo redes de comunicações móveis, GSM, Wi-Fi, rá- dio, sem comprometer a qualidade dos ser- viços. Tendo

Instituto de Sistemas e Robotica

93

Teorias Topologicas Cuanticas de Campos para Principiantes  

E-print Network

Teor´ias Topol´ogicas Cu´anticas de Campos para Principiantes ´o The Unreasonable Effectiveness #12;Teor´ia de Yang-Mills - Ecuaciones Supongamos que E Mn es un G-haz vectorial sobre una n electrodin´amica cl´asica. #12;Teor´ia de Yang-Mills - Simetr´ias Yang-Mills es un ejemplo de una teor´ia de

94

TELEMEDICINA: UN DESAFÍO PARA AMÉRICA LATINA  

PubMed Central

La telemedicina es una tendencia creciente en la prestación de los servicios médicos. Aunque la eficacia de esta práctica no ha estado bien establecida, es probable que los países en desarrollo compartirán este nuevo paradigma con los desarrollados. Los defensores de la telemedicina en América Latina sostienen que será una herramienta útil para reducir las disparidades y mejorar la accesibilidad de atención de salud. Aunque América Latina quizá se convierta en un lugar para la investigación e investigación de estos procedimientos, no está claro cómo la telemedicina podría contribuir a mejorar la accesibilidad para las poblaciones desfavorecidas, o coexistir con sistemas de atención de salud públicos crónicamente enfermos. Telemedicine is a growing trend in the provision of medical services. Although the effectiveness of this practice has not been well established, it is likely that developing countries will share this new paradigm with developed ones. Supporters of telemedicine in Latin America maintain that it will be a useful tool for reducing disparities and improving health care accessibility. Although Latin America might become a place for research and investigation of these procedures, it is not clear how telemedicine could contribute to improving accessibility for disadvantaged populations, or coexist with chronically ill-funded public healthcare systems. PMID:21625326

Litewka, Sergio

2011-01-01

95

Centro para la Salud Mundial (CGH) del NCI  

Cancer.gov

El Centro para la Salud Mundial (CGH) del Instituto Nacional del Cáncer coordina actividades de investigación y trabaja con socios nacionales e internacionales para comprender y enfrentar la carga que representa el cáncer a nivel mundial.

96

Guía técnica para el análisis de instituciones financieras microempresariales  

Microsoft Academic Search

El propósito que se pretende obtener con la publicación de esta Guía es proporcionar un formato estándar para el análisis de instituciones que prestan servicios financieros al sector de la microempresa. Esta Guía da a conocer todas aquellas técnicas y el análisis necesario para la evaluación y el diseño de programas de apoyo para instituciones financieras especializadas. Las técnicas analíticas

Mark Flaming; Martin Holtmann; Rochus Mommartz

1999-01-01

97

Control del dolor: Apoyo para las personas con cáncer  

Cancer.gov

Contiene información sobre las medicinas contra el dolor para pacientes con cáncer, los planes para controlarlo, cómo hablar con su equipo de atención médica sobre el dolor que usted siente y qué hacer para controlar los efectos físicos y emocionales del mismo.

98

Convocatoria de Becas del Gobierno de Mxico para Extranjeros 2011  

E-print Network

, especialidades médicas, para realizar investigaciones a nivel de posgrado, estancias posdoctorales, movilidad posdoctorales · 3 a 5 meses para programas de movilidad a nivel posgrado. SIN POSIBILIDAD DE PR�RROGA EN TODOS documentos originales. · Para las becas de movilidad de posgrado, se debe contar con la carta de aceptación

Jeanjean, Louis

99

Technological Foresight - Um instrumento para política científica e tecnológica1  

Microsoft Academic Search

Este texto tem por objetivo apresentar a abordagem de technological foresight2, crescentemente utilizada em vários países como instrumento para a alocação de fundos públicos de C&T, para definição de priorida- des de pesquisa e para melhorar a articulação das organizações de pes- quisa com as redes de inovação e o setor produtivo. São discutidas suas bases teóricas, suas principais características

MAURO ZACKIEWICZ; SÉRGIO SALLES-FILHO

100

Allergic contact dermatitis to para-phenylenediamine.  

PubMed

Exposure to hair dye is the most frequent route of sensitisation to para-phenylenediamine (PPD), a common contact allergen. International studies have examined the profile of PPD, but Australian-sourced information is lacking. Patients are often dissatisfied with advice to stop dyeing their hair. This study examines patients' characteristics, patch test results and outcomes of PPD allergy from a single Australian centre, through a retrospective analysis of patch test data from 2006 to 2013 at the Liverpool Hospital Dermatology Department. It reviews the science of hair dye allergy, examines alternative hair dyes and investigates strategies for hair dyeing. Of 584 patients, 11 were allergic to PPD. Our PPD allergy prevalence rate of 2% is at the lower end of international reported rates. About half these patients also react to para-toluenediamine (PTD). Affected patients experience a significant lifestyle disturbance. In all, 78% tried alternative hair dyes after the patch test diagnosis and more than half continued to dye their hair. Alternative non-PPD hair dyes are available but the marketplace can be confusing. Although some patients are able to tolerate alternative hair dyes, caution is needed as the risk of developing an allergy to other hair dye ingredients, especially PTD, is high. PMID:25302475

Jenkins, David; Chow, Elizabeth T

2014-10-10

101

On Ensino de Astronomia: Desafios para Implantação  

NASA Astrophysics Data System (ADS)

Em 2002 o ensino de Astronomia foi proposto como um dos temas estruturadores pelos Parâmetros Curriculares Nacionais e sugerido como facilitador para que o aluno compreendesse a Física como construção humana e parte do seu mundo vivencial, mas raramente seus conceitos foram ensinados. A presente pesquisa discute dois aspectos relacionados à abordagem de Astronomia. O primeiro aspecto é se ela está sendo abordada pelos professores do Ensino Médio e o segundo, aborda a maneira como ela está sendo ensinada. Optou-se pela aplicação de um questionário a partir do 2° semestre de 2006 e durante o ano de 2007 com professores que ministram a disciplina de Física, os quais trabalham em escolas estaduais em Rio Grande da Serra, Ribeirão Pires e Mauá no estado São Paulo. Dos 66,2% dos professores que responderam ao questionário nos municípios de Rio Grande da Serra, Ribeirão Pires e Mauá, 57,4% não aplicaram nenhum tópico de astronomia, 70,2% não utilizaram laboratório, 89,4% não utilizaram qualquer tipo de programa computacional, 83,0% nunca fizeram visitas com alunos a museus e planetários e 38,3% não indicaram qualquer tipo de livro ou revista referente à astronomia aos seus alunos. Mesmo considerando a Astronomia um conteúdo potencialmente significativo, esta não fez parte dos planejamentos escolares. Portanto são necessárias propostas que visem estratégias para a educação continuada dos professores como, por exemplo, cursos específicos sobre o ensino em Astronomia.

Faria, R. Z.; Voelzke, M. R.

2008-09-01

102

Más para ellas - Sugerencias para cerrar la brecha entre géneros en las regiones en desarrollo  

Microsoft Academic Search

Según el pensamiento convencional, la salud y la educación son factores esenciales para el desarrollo económico y social: permiten mejorar la distribución del ingreso y la productividad, y además, los más beneficiados son los pobres. Sin embargo, en muchas regiones del mundo no todos los miembros de la sociedad reciben estos servicios equitativamente. En muchos casos las mujeres están excluidas

Alessandro Magnoli

2005-01-01

103

On Lightlike Geometry of Para-Sasakian Manifolds  

PubMed Central

We study lightlike hypersurfaces of para-Sasakian manifolds tangent to the characteristic vector field. In particular, we define invariant lightlike hypersurfaces and screen semi-invariant lightlike hypersurfaces, respectively, and give examples. Integrability conditions for the distributions on a screen semi-invariant lightlike hypersurface of para-Sasakian manifolds are investigated. We obtain a para-Sasakian structure on the leaves of an integrable distribution of a screen semi-invariant lightlike hypersurface. PMID:24892072

Acet, Bilal Eftal; K?l?ç, Erol

2014-01-01

104

Hedlena Maria de Almeida Coloriza 3D para  

E-print Network

Hedlena Maria de Almeida Bezerra Colorizaçã 3D para Animação 2D DISSERTA��O DE MESTRADO Maria de Almeida Bezerra Colorizaçã 3D para Animação 2D Dissertação de Mestrado Dissertação apresentada. Velho Rio de Janeiro Maio de 2005 #12;Hedlena Maria de Almeida Bezerra Colorizaçã 3D para Animação 2D

105

Ortho-para conversion of interstitial H2 in Si.  

PubMed

Ortho-para conversion of isolated interstitial H2 in single-crystalline Si is studied by Raman scattering. This process is suggested to be caused by the interaction of H2 with the nuclear magnetic moment of 29Si. At 77 K the ortho-to-para conversion rate is approximately 0.015 h(-1) for all Si samples employed in the experiments. At 300 K, the reverse para-to-ortho transition is observed. It occurs with a rate of roughly 0.18 h(-1) and results in a thermodynamically nonequilibrium ortho-para ratio. PMID:17358873

Hiller, M; Lavrov, E V; Weber, J

2007-02-01

106

Cooling by Para-to-Ortho-Hydrogen Conversion  

NASA Technical Reports Server (NTRS)

Catalyst speeds conversion, increasing capacity of solid hydrogen cooling system. In radial-flow catalytic converter, para-hydrogen is converted to equilibrium mixture of para-hydrogen and ortho-hydrogen as it passes through porous cylinder of catalyst. Addition of catalyst increases capacity of hydrogen sublimation cooling systems for radiation detectors.

Sherman, A.; Nast, T.

1983-01-01

107

METODOLOGÍA PARA LA COORDINACIÓN DEL TRABAJO SOCIOCULTURAL COMUNITARIO  

Microsoft Academic Search

La cultura como conjunto de relaciones humanas que ha transcendido en el tiempo y que le permite al hombre conservar, reproducir, crear nuevos conocimientos y valores para la transformación de su medio social y cultural, cada día cobra mayor importancia como sostén fundamental para la satisfacción de las necesidades espirituales y como elemento de influencia directa en la producción de

Ricardo Enoa Leyva; Florentino Montes de Oca Ruiz

2011-01-01

108

Uso del Contexto para la Búsqueda de Respuestas en Español  

Microsoft Academic Search

Resumen. Actualmente, la creciente cantidad de información disponible en medios electrónicos representa un reto para la evolución de los mecanismos de acceso y recuperación de la misma. Recientemente los sistemas de Búsqueda de Respuestas (BR) han reaparecido como una alternativa viable a este reto. A pesar su potencial el desarrollo de este tipo de sistemas para el idioma Español aún

Manuel Pérez-Coutiño; Manuel Montes-y-Gómez; Aurelio López-López; Luis Enrique

109

Recogido de Datos Pblicos: Gua para los Lmites Anuales de  

E-print Network

Recogido de Datos Públicos: Guía para los Límites Anuales de Captura (ACLs) y Medidas de;3 Límites Anuales de Captura (ACLs) y Medidas de Responsabilidad (AMs) · ACLs y AMs funcionan en conjunto como un sistema para asegurar que no ocurra sobrepesca · ACLs y AMs deberán: ­ Terminar la sobrepesca

110

App. Android Accesible para una Rutina de Movilidad Articular y  

E-print Network

App. Android Accesible para una Rutina de Movilidad Articular y Espalda M. Redondo, H. García parte del tiempo · Disponible el Google Play · Gratuita · App futuras: ­ Pruebas de campo Origen: App para tonificación muscular · "Tono muscular, también conocido como tensión muscular residual

Boemo, Eduardo

111

Towards a double field theory on para-Hermitian manifolds  

SciTech Connect

In a previous paper, we have shown that the geometry of double field theory has a natural interpretation on flat para-Kähler manifolds. In this paper, we show that the same geometric constructions can be made on any para-Hermitian manifold. The field is interpreted as a compatible (pseudo-)Riemannian metric. The tangent bundle of the manifold has a natural, metric-compatible bracket that extends the C-bracket of double field theory. In the para-Kähler case, this bracket is equal to the sum of the Courant brackets of the two Lagrangian foliations of the manifold. Then, we define a canonical connection and an action of the field that correspond to similar objects of double field theory. Another section is devoted to the Marsden-Weinstein reduction in double field theory on para-Hermitian manifolds. Finally, we give examples of fields on some well-known para-Hermitian manifolds.

Vaisman, Izu [Department of Mathematics, University of Haifa, Haifa (Israel)] [Department of Mathematics, University of Haifa, Haifa (Israel)

2013-12-15

112

Dissociative recombination of highly enriched para-H3+.  

PubMed

The determination of the dissociative recombination rate coefficient of H(3) (+) has had a turbulent history, but both experiment and theory have recently converged to a common value. Despite this convergence, it has not been clear if there should be a difference between the rate coefficients for ortho-H(3) (+) and para-H(3) (+). A difference has been predicted theoretically and could conceivably impact the ortho:para ratio of H(3) (+) in the diffuse interstellar medium, where H(3) (+) has been widely observed. We present the results of an experiment at the CRYRING ion storage ring in which we investigated the dissociative recombination of highly enriched ( approximately 83.6%) para-H(3) (+) using a supersonic expansion source that produced ions with T(rot) approximately 60-100 K. We observed an increase in the low energy recombination rate coefficient of the enriched para-H(3) (+) by a factor of approximately 1.25 in comparison to H(3) (+) produced from normal H(2) (ortho:para=3:1). The ratio of the rate coefficients of pure para-H(3) (+) to that of pure ortho-H(3) (+) is inferred to be approximately 2 at low collision energies; the corresponding ratio of the thermal rate coefficients is approximately 1.5 at electron temperatures from 60 to 1000 K. We conclude that this difference is unlikely to have an impact on the interstellar ortho:para ratio of H(3) (+). PMID:19173501

Tom, Brian A; Zhaunerchyk, Vitali; Wiczer, Michael B; Mills, Andrew A; Crabtree, Kyle N; Kaminska, Magdalena; Geppert, Wolf D; Hamberg, Mathias; Af Ugglas, Magnus; Vigren, Erik; van der Zande, Wim J; Larsson, Mats; Thomas, Richard D; McCall, Benjamin J

2009-01-21

113

Construction of a Para-Ortho Hydrogen Test Cryostat  

NASA Astrophysics Data System (ADS)

In a prospective hydrogen economy it is necessary to verify the para concentration of the employed hydrogen. In case of a short storage time of about a few days only it has been shown that a partial conversion into para-hydrogen gives an optimized overall efficiency. Hence, an easy and reliable method of measuring the para-hydrogen concentration is needed. In this paper, the concept and construction of a small test cryostat are described and first results are presented. The measuring principle is based on a catalytic induced adiabatic ortho-para conversion of a hydrogen gas flow starting from a known temperature. The operation of the system only requires a certain amount of liquid nitrogen as coolant. To determine the concentration of para-hydrogen it is only necessary to measure the temperature of the gas before and after the adiabatic catalyst cell. The measuring cryostat is used for further investigation of the spontaneous para-ortho conversion in the supercritical state. In addition, the design of the cryostat allows the investigation of different catalyst materials regarding the catalytic activity and possible degradation by using a known para concentration for the measurement.

Essler, J.; Haberstroh, Ch.

2010-04-01

114

40 CFR 721.9520 - Methylated-para-rosaniline salt of a trisulfonated triarylmethane dye (generic).  

Code of Federal Regulations, 2010 CFR

... false Methylated-para-rosaniline salt of a trisulfonated triarylmethane dye...9520 Methylated-para-rosaniline salt of a trisulfonated triarylmethane dye...generically as methylated-para-rosaniline salt of a trisulfonated triarylmethane...

2010-07-01

115

40 CFR 721.9520 - Methylated-para-rosaniline salt of a trisulfonated triarylmethane dye (generic).  

Code of Federal Regulations, 2013 CFR

... false Methylated-para-rosaniline salt of a trisulfonated triarylmethane dye...9520 Methylated-para-rosaniline salt of a trisulfonated triarylmethane dye...generically as methylated-para-rosaniline salt of a trisulfonated triarylmethane...

2013-07-01

116

La terapia hormonal para la menopausia y el cáncer  

Cancer.gov

Hoja informativa acerca de los resultados de los estudios sobre el uso de la terapia hormonal para la menopausia. Incluye información sobre el efecto de esta terapia en el cuerpo y explica los riesgos y beneficios del uso de hormonas.

117

Control del dolor: Apoyo para las personas con cáncer  

Cancer.gov

Libro sobre el control del dolor en pacientes con cáncer. Cubre los métodos y medicinas, así como los efectos físicos y emocionales del dolor. Es una adaptación cultural para el público de habla hispana del libro en inglés Pain Control.

118

ParaDiS-FEM dislocation dynamics simulation code primer  

SciTech Connect

The ParaDiS code is developed to study bulk systems with periodic boundary conditions. When we try to perform discrete dislocation dynamics simulations for finite systems such as thin films or cylinders, the ParaDiS code must be extended. First, dislocations need to be contained inside the finite simulation box; Second, dislocations inside the finite box experience image stresses due to the free surfaces. We have developed in-house FEM subroutines to couple with the ParaDiS code to deal with free surface related issues in the dislocation dynamics simulations. This primer explains how the coupled code was developed, the main changes from the ParaDiS code, and the functions of the new FEM subroutines.

Tang, M; Hommes, G; Aubry, S; Arsenlis, A

2011-09-27

119

Consejos para cuando le duelan la boca o la garganta  

Cancer.gov

Información para personas que están recibiendo radioterapia y consejos sobre cómo controlar las molestias en la boca y garganta, sentirse mejor durante el tratamiento y comunicarse con su doctor o enfermera.

120

ParaWeb: towards world-wide supercomputing  

Microsoft Academic Search

In this paper, we describe the design of a system, called ParaWeb, for utilizing Internet or intra-net computing resources in a seamless fashion. The goal is to allow users to execute serial programs on faster compute servers or parallel programs on a variety of possibly heterogeneous hosts. ParaWeb provides extensions to the Java programming environment (through a parallel class library)

Tim Brecht; Harjinder S. Sandhu; Meijuan Shan; Jimmy Talbot

1996-01-01

121

Cooling by conversion of para to ortho-hydrogen  

NASA Technical Reports Server (NTRS)

The cooling capacity of a solid hydrogen cooling system is significantly increased by exposing vapor created during evaporation of a solid hydrogen mass to a catalyst and thereby accelerating the endothermic para-to-ortho transition of the vapor to equilibrium hydrogen. Catalyst such as nickel, copper, iron or metal hydride gels of films in a low pressure drop catalytic reactor are suitable for accelerating the endothermic para-to-ortho conversion.

Sherman, A. (inventor)

1983-01-01

122

Para hydrogen equilibration in the atmospheres of the outer planets  

NASA Technical Reports Server (NTRS)

The thermodynamic behavior of the atmospheres of the Jovian planets is strongly dependent on the extent to which local thermal equilibration of the ortho and para states of molecular hydrogen is achieved. Voyager IRIS data from Jupiter imply substantial departures of the para hydrogen fraction from equilibrium in the upper troposphere at low latitudes, but with values approaching equilibrium at higher latitudes. Data from Saturn are less sensitive to the orth-para ratio, but suggest para hydrogen fractions near the equilibrium value. Above approximately the 200 K temperature level, para hydrogen conversion can enhance the efficiency of convection, resulting in a substantial increase in overturning times on all of the outer planets. Currently available data cannot definitively establish the ortho-para ratios in the atmospheres of Uranus and Neptune, but suggest values closer to local equilibrium than to the 3.1 normal ratio. Modeling of sub-millimeter wavelength measurements of these planets suggest thermal structures with frozen equilibrium lapse rates in their convective regions.

Conrath, Barney J.

1986-01-01

123

Sistemas Correctores de Campo Para EL Telescopio Cassegrain IAC80  

NASA Astrophysics Data System (ADS)

El proyecto de instrumentación de mayor importancia que ha tenido el Instituto de Astrofisica de Canarias en los últimos afios ha sido el diseflo y construcción del te1escopio IAC8O. Este requería del esfuerzo con junto en mec´nica, óptica y electrónica, lo que facilitó la estructuración y el crecimiento de los respectivos grupos de trabajo, que posteriormente se integraron en departamentos En su origen (1977), el telescopio IAC80 fue concebido como un sistema clásico tipo Cassegrain, con una razón focal F/i 1.3 para el sistema Casse grain y una razón focal F/20 para el sistema Coudé. Posteriormente, aunque se mantuvo la filosofia de que el sistema básico fuera el F/11.3, se consideró conveniente el diseño de secundarios para razones focales F/16 y F/32, y se eliminó el de F/20. Sin embargo, dada la importancia relativa que un foco estrictamente fotográfico tiene en un telescopio moderno, diseñado básicamente para fotometría fotoeléctrica y con un campo util mínimamente de 40 minutos de arco, se decídió Ilevar a cabo el diseño de un secundario F/8 con un sistema corrector de campo, pero que estuviera formado únicamente por lentes con superficies esféricas para que asl su construcción fuera posible en España ó en México. La creciente utilización de detectores bidimensionales para fines de investigación astron6mica y la viabilidad de que en un futuro cercano éstos tengan un área sensible cada vez mayor, hicieron atractiva la idea de tener diseñado un sistema corrector de campo para el foco primario (F/3), con un campo útil mínimo de un grado, y también con la limitante de que sus componentes tuvieron sólamente supérficies esféricas. Ambos diseños de los sis-temas correctores de campo se llevaron a cabo, en gran medida, como parte de un proyecto de colaboración e intercambio en el área de diseño y evaluación de sistemas ópticos.

Galan, M. J.; Cobos, F. J.

1987-05-01

124

ParaText : scalable text modeling and analysis.  

SciTech Connect

Automated processing, modeling, and analysis of unstructured text (news documents, web content, journal articles, etc.) is a key task in many data analysis and decision making applications. As data sizes grow, scalability is essential for deep analysis. In many cases, documents are modeled as term or feature vectors and latent semantic analysis (LSA) is used to model latent, or hidden, relationships between documents and terms appearing in those documents. LSA supplies conceptual organization and analysis of document collections by modeling high-dimension feature vectors in many fewer dimensions. While past work on the scalability of LSA modeling has focused on the SVD, the goal of our work is to investigate the use of distributed memory architectures for the entire text analysis process, from data ingestion to semantic modeling and analysis. ParaText is a set of software components for distributed processing, modeling, and analysis of unstructured text. The ParaText source code is available under a BSD license, as an integral part of the Titan toolkit. ParaText components are chained-together into data-parallel pipelines that are replicated across processes on distributed-memory architectures. Individual components can be replaced or rewired to explore different computational strategies and implement new functionality. ParaText functionality can be embedded in applications on any platform using the native C++ API, Python, or Java. The ParaText MPI Process provides a 'generic' text analysis pipeline in a command-line executable that can be used for many serial and parallel analysis tasks. ParaText can also be deployed as a web service accessible via a RESTful (HTTP) API. In the web service configuration, any client can access the functionality provided by ParaText using commodity protocols ... from standard web browsers to custom clients written in any language.

Dunlavy, Daniel M.; Stanton, Eric T.; Shead, Timothy M.

2010-06-01

125

Hox and ParaHox genes: A review on molluscs.  

PubMed

Hox and ParaHox genes are involved in patterning the anterior-posterior body axis in metazoans during embryo development. Body plan evolution and diversification are affected by variations in the number and sequence of Hox and ParaHox genes, as well as by their expression patterns. For this reason Hox and ParaHox gene investigation in the phylum Mollusca is of great interest, as this is one of the most important taxa of protostomes, characterized by a high morphological diversity. The comparison of the works reviewed here indicates that species of molluscs, belonging to different classes, share a similar composition of Hox and ParaHox genes. Therefore evidence suggests that the wide morphological diversity of this taxon could be ascribed to differences in Hox gene interactions and expressions and changes in the Hox downstream genes rather than to Hox cluster composition. Moreover the data available on Hox and ParaHox genes in molluscs compared with those of other Lophotrochozoa shed light on the complex and controversial evolutionary histories that these genes have undergone within protostomes. genesis 52:935-945, 2014. © 2014 Wiley Periodicals, Inc. PMID:25394269

Biscotti, Maria Assunta; Canapa, Adriana; Forconi, Mariko; Barucca, Marco

2014-12-01

126

El uso de la neuromodulación para el tratamiento del temblor  

PubMed Central

Introducción: El temblor puede ser un desorden incapacitante y el tratamiento de primera línea para estos pacientes es farmacológico. Sin embargo, este tratamiento puede llevar a una reducción satisfactoria del temblor en sólo el 50% de los pacientes con temblor esencial. La talamotomía era el tratamiento de elección para el temblor refractario al tratamiento médico hasta que comenzó a utilizarse la estimulación cerebral profunda (ECP) del núcleo ventral intermedio (Vim) del tálamo. En la actualidad, raramente se realiza la talamotomía. Métodos: Este artículo es una revisión no sistemática de las indicaciones, resultados, parámetros de programación y técnica quirúrgica de la ECP del Vim para el tratamiento del temblor. Resultados: Aunque los resultados clínicos son similares usando la talamotomía o la ECP del Vim, la primera causa más efectos adversos que la última. Además, la ECP puede ser usada bilateralmente, mientras que la talamotomía tiene un alto riesgo de causar disartria cuando se realiza de ambos lados. La ECP del Vim logró una adecuada mejoría del temblor en varias series de pacientes con temblor causado por temblor esencial, enfermedad de Parkinson o esclerosis múltiple. Además del Vim, hay otros blancos que están siendo usados por varios autores, tales como la zona incerta y las radiaciones prelemniscales. Conclusión: La ECP del Vim es un tratamiento útil para el temblor incapacitante refractario al tratamiento médico. Es esencial realizar una precisa selección de pacientes, así como utilizar una técnica quirúrgica correcta. Aún se desconoce el mejor blanco estereotáctico para el temblor, aunque el Vim es el más usado. PMID:25165613

Bendersky, Damián; Ajler, Pablo; Yampolsky, Claudio

2014-01-01

127

Accesibilidad para personas con debilidad auditiva Mac OS X Snow Leopard  

E-print Network

Accesibilidad para personas con debilidad auditiva Mac OS X Snow Leopard ASIC ­ 18 de noviembre de 2010 Pág. 1 de 14 GUÍA DE ACCESIBILIDAD PARA PERSONAS CON DEBILIDAD AUDITIVA EN ENTORNO MAC OS X SNOW LEOPARD MAC OS X Snow Leopard ofrece algunas ayudas para personas sordas o con problemas para escuchar

Fernández de Córdoba, Pedro

128

Stent grafting a ruptured para-anastomotic iliac aneurysm.  

PubMed

In this case report, we present an 83-year-old man with a ruptured para-anastomotic aneurysm who underwent a stent graft in spite of his condition of acute shock. Our patient presented at the emergency room (ER) with acute abdominal pain. Shortly after arrival, he collapsed because of a ruptured para-anastomotic aneurysm after the previous aorto-bi-iliac aneurysm repair in 1984. He was charged with a cardiac history that made him unsuitable for surgery. We chose for resuscitation followed by inflation of an aortic balloon that made the patient hemodynamically stable. He then underwent iliac stent grafting and was discharged from the hospital at 22 days after the procedure. The mortality rate of patients with a ruptured para-anastomotic aortic aneurysm arriving at hospital ranges from 32% to 70%. Endovascular stent placement for ruptured iliac aneurysmal arteries can be a safe treatment in selected patients. PMID:20538732

Menke, Vivianda; Castenmiller, Peter H; Versteijlen, Rob J; Van der Laan, Lijckle

2010-08-01

129

Volait Mercedes, " Il contributo italiano alla costruzione della citt nuova di Heliopolis/The Italian contribution to the  

E-print Network

of the new city of Heliopolis Mercedes Volait (CNRS) A city born of a railway A city created ex nihilo-29Jan2010 #12;neighborhood called "Garden City" consisted of a walled "indigenous city" grouping basic/The Italian contribution to the construction of the new city of Heliopolis " Version de l'auteur, pour la

Paris-Sud XI, Université de

130

Pasanta en TICs para el Carlos Rey Moreno  

E-print Network

1 Pasantía en TICs para el desarrollo Carlos Rey Moreno I.T.T Sistemas de Telecomunicación UC3M MSc;2 Búsqueda de Pasantía Pasantía sobre TICs en país anglófono Desmoralización en la búsqueda: Conocimientos sobre TICs con ONG española ISF o Fundación EHAS Actividades académicas en Cooperación para el

Autonoma de Madrid, Universidad

131

Acerca del Centro para la Salud Mundial del NCI  

Cancer.gov

El Centro para la Salud Mundial (CGH) coordina y fija las prioridades en las actividades que lleva a cabo el Instituto Nacional del Cáncer a nivel mundial. Su objetivo es avanzar la investigación mundial del cáncer y reducir las muertes causadas por esta enfermedad.

132

Proyeccion de datos para la construccion de estados financieros  

Microsoft Academic Search

Este es material de curso del libro Decisiones Empresariales bajo Riesgo e Incertidumbre. El nivel del libro es basico. Se usan muy pocas matematicas y puede ser usado por gerentes. El capitulo cinco trata acerca de la preparacion y uso de la informacion para hacer proyecciones de estados financieros. En este capitulo se muestra paso a paso como proyectar apropiadamente

Ignacio Velez-Pareja

2009-01-01

133

Instrumentos para el desarrollo de dueños de pequeñas tierras forestales  

Microsoft Academic Search

Una de las formas de enfrentar los problemas derivados de la fragmentación de las tierras de vocación forestal (TVF) es la adopción de estrategias de intervención que lleven a la integración de las pequeñas propiedades en unidades productivas mayores o que permitan la utilización de tecnologías propias para propiedades mayores. Este es uno de los resultados del estudio \\

José Rente Nascimento; José Luis B. Mota Villanueva

2004-01-01

134

SERVICIOS DE RECUPERACIN DE DESASTRES DISPONIBLES PARA USTED  

E-print Network

Management Agency, FEMA) tiene un Programa de Asistencia Individual que ayuda a financiar necesidades y cumple con los requisitos para recibir asistencia, llame al 1(800) 621-FEMA(3362) o visite www.fema desastre mas cercano llamando al 1(800) 621- 3362 o visitando www.fema

135

Uma aplicação Web para análise de exames Cardio- Respiratórios  

Microsoft Academic Search

This paper describes a web-application in development to help on the analysis of cardiorespiratory system of health and pathological subjects. The software helps health professionals in rehabilitation tasks as also in prevention of cardiorespiratory diseases. Resumo. Este artigo descreve uma aplicação web em desenvolvimento para auxiliar na análise e interpretação de resultados de exames que avaliam o sistema cardiorrespiratório de

Maria Angelica de Oliveira; Camargo Brunetto; André Luis Debiaso Rossi

136

Alunos convocados para o Enade 2012* ADRIANA FERREIRA RIBEIRO  

E-print Network

DIREITO Alunos convocados para o Enade 2012* ADRIANA FERREIRA RIBEIRO ADRIANA SANTOS LONARDI LUIZA AGHINA FERREIRA ANTONIA GENOBIE ANTONIO GIL ANTONIO CARLOS AMORIM CASTELLO BRANCO ANTONIO DE QUEIROZ BUENO DO PRADO ARIANE ALEXANDRINA DE SOUZA TEIXEIRA ARIANE BAARS ARTUR LARA FERREIRA BARBARA

137

Propuesta de modelo financiero para crecimiento corporativo sostenible  

Microsoft Academic Search

Aspectos como la capacidad técnica y económica en la producción de bienes y servicios, la gestión administrativa y financiera, y las políticas de comercialización o mercadeo, son determinantes para el crecimiento sostenible de las organizaciones, entendido como un proceso dinámico que tiene efecto en la creación de valor de las mismas. El objetivo fundamental de este trabajo es definir un

Giovanni E. Reyes; Andrea Briceño M

2010-01-01

138

Terapias adyuvantes y neoadyuvantes para el cáncer de seno  

Cancer.gov

Hoja informativa que explica las terapias adyuvantes (tratamiento que se administra además de la terapia primaria para aumentar la posibilidad de supervivencia a largo plazo) y las neoadyuvantes (terapia que se administra antes de la terapia principal). Contiene información sobre los efectos secundarios y sobre los riesgos y beneficios de estas terapias.

139

DOCUMENTAO PARA INGRESSO COMO PORTADOR DE DIPLOMA DE  

E-print Network

; - Certificado de Dispensa de Incorporação; - CPF; Se candidato estrangeiro: - Certificado de Conclusão de de Identidade; - CPF; - Passaporte, onde deverá constar o visto de estudante / permanência atualizado Dispensa de Incorporação (Apenas para alunos brasileiros) - Cópia do CPF - Cópia do Certificado de

140

ELABORACION DE ALGORITMOS DE PRUEBA PARA RELES DE PROTECCION  

E-print Network

protección de naturaleza electrónica digital; estos mismos, para su control periódico requieren de pruebas, transforming, generators and cables, the same that are watched over protective devices of digital electronic agile and optimizes the management of maintenance of the substations. The present work this oriented

Boyer, Edmond

141

Estudiar las redes sociales: Aportes y perspectivas para las  

E-print Network

Estudiar las redes sociales: Aportes y perspectivas para las ciencias sociales Claire Bidart LEST estructuracio- nes, sus dinámicas. Transversales a los grupos y a las estructuras sociales glo- bales, las redes. Transversales a los grupos y a las estructuras sociales globales, las redes sin embargo repercuten en ellos

Paris-Sud XI, Université de

142

Donación de tejidos para investigación oncológica: muestras y depósitos biológicos  

Cancer.gov

Hoja informativa que describe la importancia de las muestras biológicas y de los depósitos biológicos en la investigación oncológica, y los programas del NCI para aumentar el suministro de muestras biológicas de alta calidad. Explica también cómo los pacientes y otras personas pueden ayudar a apoyar la investigación que usa muestras biológicas.

143

ACUTE TOXICITY OF PARA-NONYLPHENOL TO SALTWATER ANIMALS  

EPA Science Inventory

?para-Nonylphenol (PNP), a mixture of alkylphenols used in producing nonionic surfactants, is distributed widely in surface waters and aquatic sediments, where it can affect saltwater species. This article describes a database for acute toxicity of PNP derived for calculating a n...

144

Lowest Electronic Excited States of Poly(para-cyclobutadienylenecyclopentadienylcobalt)butadiynylene  

E-print Network

(para-cyclobutadienylenecyclopentadienylcobalt)butadiynylene was studied with electronic absorption, Raman, and resonance Raman spectroscopies to determine the nature reso- nance Raman spectroscopy. To accomplish this, we rely on a assignments were made by comparing the 457.9 nm excited resonance Raman frequencies and depolarization ratios

Myrick, Michael Lenn

145

Analyzing and Visualizing Cosmological Simulations with ParaView  

SciTech Connect

The advent of large cosmological sky surveys - ushering in the era of precision cosmology - has been accompanied by ever larger cosmological simulations. The analysis of these simulations, which currently encompass tens of billions of particles and up to a trillion particles in the near future, is often as daunting as carrying out the simulations in the first place. Therefore, the development of very efficient analysis tools combining qualitative and quantitative capabilities is a matter of some urgency. In this paper, we introduce new analysis features implemented within ParaView, a fully parallel, open-source visualization toolkit, to analyze large N-body simulations. A major aspect of ParaView is that it can live and operate on the same machines and utilize the same parallel power as the simulation codes themselves. In addition, data movement is in a serious bottleneck now and will become even more of an issue in the future; an interactive visualization and analysis tool that can handle data in situ is fast becoming essential. The new features in ParaView include particle readers and a very efficient halo finder that identifies friends-of-friends halos and determines common halo properties, including spherical overdensity properties. In combination with many other functionalities already existing within ParaView, such as histogram routines or interfaces to programming languages like Python, this enhanced version enables fast, interactive, and convenient analyses of large cosmological simulations. In addition, development paths are available for future extensions.

Woodring, Jonathan [Los Alamos National Laboratory (LANL); Heitmann, Katrin [ORNL; Ahrens, James P [ORNL; Fasel, Patricia [Los Alamos National Laboratory (LANL); Hsu, Chung-Hsing [ORNL; Habib, Salman [ORNL; Pope, Adrian [Los Alamos National Laboratory (LANL)

2011-01-01

146

REGLAMENTO PARA LA PROMOCIN Y APOYO AL DEPORTISTA UNIVERSITARIO  

E-print Network

obligación de fomentar el deporte que establece el artículo 43.3 de la Constitución Española, lo que se libre elección curricular. El deporte universitario, a nivel competitivo, está constituido por una fase Campeonato Autonómico del Deporte Universitario (CADU), que sirve de clasificatoria para el Campeonato de

Escolano, Francisco

147

MEMORIA PARA LA PROPUESTA DE INVESTIGACIN EN INGENIERA CIVIL  

E-print Network

MEMORIA PARA LA PROPUESTA DE MASTER DE INVESTIGACI�N EN INGENIERÍA CIVIL A IMPLANTAR EN EL CURSO 2013-2014 #12;ETS Ingenieros de Caminos, Canales y Puertos MÁSTER EN INVESTIGACI�N EN INGENIERÍA CIVIL Máster de Investigación en Ingeniería Civil por la Universidade da Coruña Indicar si el programa se

Fraguela, Basilio B.

148

NORMAS GERAIS PARA INGRESSO COMO PORTADOR DE DIPLOMA DE  

E-print Network

1 NORMAS GERAIS PARA INGRESSO COMO PORTADOR DE DIPLOMA DE GRADUA��O (BRASIL) PERÍODO 2013.2 PRAZO PORTADOR DE DIPLOMA DE GRADUA��O DO BRASIL I­DAS CONDI��ES Portadores de Diploma de Graduação de Cursos; - Certificado de Dispensa de Incorporação; - CPF; Se candidato estrangeiro: - Certificado de Concl

149

NORMAS GERAIS PARA INGRESSO COMO PORTADOR DE DIPLOMA DE  

E-print Network

1 NORMAS GERAIS PARA INGRESSO COMO PORTADOR DE DIPLOMA DE GRADUA��O (BRASIL) PERÍODO 2013.1 PRAZO COMO PORTADOR DE DIPLOMA DE GRADUA��O DO BRASIL I­DAS CONDI��ES Portadores de Diploma de Graduação de; - Certificado de Dispensa de Incorporação; - CPF; Se candidato estrangeiro: - Certificado de

150

Clearance of para-aminohippuric acid in wethers consuming locoweed  

Microsoft Academic Search

AIM: To validate the use of para-aminohippuric acid (PAH) as a marker for measuring blood flow in wethers consuming a mixed diet of locoweed and blue grama hay.METHODS: Fourteen sheep, stratified by bodyweight (BW), were assigned to one of three treatments: 0.8 mg swainsonine (SW)\\/kg BW (HI), 0.2 mg SW\\/kg BW (LO), and no SW (Control). Sheep were fed various

JR Strickland; MA Custis; AK Ashley; LL Smith; JL Klotz; CR Krehbiel

2005-01-01

151

Linguagens para Programac~ao Paralela November 26, 2009  

E-print Network

1.0 to each element of A A = SQRT(A) ! Computes square root of each element of A L = A .EQ. B ! Sets paralelismo de dados e de processos: compartilhamento de dados com conhecimento de localiza¸c~ao Titanium, UPC¸c~ao fortemente s´incronos Linguagens para Programa¸c~ao Paralela #12;Titanium - baseada em Java Point start

Rodriguez, Noemi

152

Elementos para una 'Teoría' teatral libertaria (Argentina 1900)  

E-print Network

actividades de orientación popular. 2 - DE LA REFLEXION CRITICA HACIA UNA NORMATIVA Dicha actividad literario-teatral (edición, espectáculo) apareció continuamente completada por una dimensión crítica, presente en los numerosos comentarios que se llevaban... espectadores a las veladas teatrales ("Si se reúnen quinientos compañeros para ver repre sentar dramas"), cifra que debía verse superada más de una vez, a juzgar por algunos balances de fondos recolectados por los distintos centros libertarios.7 La...

Golluscio de Montoya, Eva

1987-10-01

153

Ultrafast photogeneration mechanisms of triplet states in para-hexaphenyl  

Microsoft Academic Search

We present femtosecond pump-probe measurements, both conventional and electric field-assisted, on organic light-emitting devices based on para-hexaphenyl. The dominant triplet exciton generation mechanism is assigned to nongeminate bimolecular recombination of photogenerated, spin-12 polarons. This process is active within a few hundred femtoseconds after photoexcitation and involves about 20% of the initially excited states. At higher photoexcitation densities, we observe an

C. Zenz; G. Cerullo; G. Lanzani; W. Graupner; F. Meghdadi; G. Leising; S. de Silvestri

1999-01-01

154

DERECHOS DEL EMPLEADO LEy PARA LA PROtECCin  

E-print Network

DERECHOS DEL EMPLEADO LEy PARA LA PROtECCión DEL EMPLEADO COntRA LA PRuEbA DEL POLígRAfO PROHIBICIONES ExENCIONES DERECHOS DE LOS ExAMINADOS CUMPLIMIENTO Generalmente se le prohíbe al empleador que le aspirante a un trabajo por haberse negado a someterse a la prueba o por haberse acogido a otros derechos

Rock, Chris

155

arquivo Proposta de regras e tabela para progresso funcional  

E-print Network

reconhecidos publicamente (arxiv.org, por exemplo). Livros - Pontuam-se livros e capítulos de livros por artigos e livros pontuam por obra. Nesse caso, aceita-se o comprovante de emissão de parecer emitido pelo editor do jornal, revista ou livro. Assessoria ad-hoc para órgãos de fomento pontuam por emissão de

Floeter, Sergio Ricardo

156

PARA-HYDROXYBENZOATE AS AN INTERMEDIATE IN THE ANAEROBIC TRANSFORMATION OF PHENOL TO BENZOATE  

EPA Science Inventory

Anaerobic phenol transformation was studied using a consortium which transformed phenol to benzoate without complete mineralization of benzoate. Products of monofluorophenol transformation indicate para-carboxylation. henol and benzoate were detected during para-hydroxybenzoate (...

157

Recent Achievements in Structure Ordering and Control of Properties of Para-Aramide Fibres  

Microsoft Academic Search

The family of commercially produced high-strength, high-modulus fibres and yarns for the manufacture of technical textiles and construction composites, based on aromatic para-polyamides – poly-para-phenylene-terephphtalamide (Kevlar, Twaron), copolymers (Terlon, Technora), poly-para-heteroarylenes (SVM, Armos), was discussed and compared in the paper. The necessity of drawing such a comparison resulted from the fact that although there were papers on individual para-aramide fibres,

Kirill E. Perepelkin; Nikolai N. Machalaba

2000-01-01

158

El Centro para la Salud Mundial del NCI anuncia las primeras becas de investigación para apoyar las tecnologías portátiles  

Cancer.gov

El Centro para la Salud Mundial del NCI (CGH) anunció el otorgamiento de subvenciones que apoyarán el desarrollo y la validación de tecnologías portátiles y de bajo costo. Estas tecnologías tienen el potencial de mejorar la detección temprana, el diagnóstico y los tratamientos no invasivos o mínimamente invasivos de varios tipos de cáncer con una prevalencia particularmente alta en ciertos países con economías de ingreso bajo y mediano.

159

Semana nacional de preparacin para clima severo 2 al 8 de marzo de Manual para las redes sociales  

E-print Network

Federal para el Manejo de Emergencias (FEMA, por sus siglas en inglés) y a la Administración Nacional://www.ready.gov/es http://www.fema.gov/es www.weather.gov #12;www.noaa.gov www.ready.gov/prepare Twitter: Utilice la! Hable con su familia sobre las amenazas meteorológicas de su comunidad: www.fema.gov/preparethon #Sea

160

Taller de Ciencia para Jvenes para alumnos de nivel bachillerato San Cristbal de las Casas, Chiapas, 25-30 julio, 2011  

E-print Network

Taller de Ciencia para Jóvenes para alumnos de nivel bachillerato San Cristóbal de las Casas, Chiapas, 25-30 julio, 2011 CONVOCATORIA El "Taller de Ciencia para Jóvenes" en San Cristóbal de las Casas atraídos a las ciencias naturales y tienen intención de estudiar una carrera científica. El programa del

Bor, Gil

161

Fondos del SBIR para el desarrollo de tecnologías de imágenes más avanzadas  

Cancer.gov

El Programa de Investigación de la Innovación de la Pequeña Empresa (SBIR), junto con el Programa de Transferencia Tecnológica para la Pequeña Empresa (STTR), son los motores del NCI para la creación y comercialización de nuevas tecnologías para prevenir, diagnosticar y tratar el cáncer.

162

Accesibilidad para personas con debilidad motriz Mac Os X Snow Leopard  

E-print Network

Accesibilidad para personas con debilidad motriz Mac Os X Snow Leopard ASIC ­ 18 de noviembre de 2010 Pág. 1 de 9 GUÍA DE ACCESIBILIDAD PARA PERSONAS CON DEBILIDAD MOTRIZ EN ENTORNO MAC OS X SNOW para personas con debilidad motriz Mac Os X Snow Leopard ASIC ­ 18 de noviembre de 2010 Pág. 2 de 9

Fernández de Córdoba, Pedro

163

Accesibilidad para personas con debilidad visual Mac OS X Snow Leopard  

E-print Network

Accesibilidad para personas con debilidad visual Mac OS X Snow Leopard ASIC ­ 18 de noviembre de 2010 Pág. 1 de 25 GUÍA DE ACCESIBILIDAD PARA PERSONAS CON DEBILIDAD VISUAL EN ENTORNO MAC OS X SNOW LEOPARD Al igual que otros sistemas operativos, MAC OS X Snow Leopard ofrece algunas ayudas para que las

Fernández de Córdoba, Pedro

164

Visite www.ChooseMyPlate.gov para obtener ms informacin.  

E-print Network

consejos para crear un buen plato Elegir alimentos para llevar un estilo de vida sano es muy sencillo si sigue estos 10 consejos. Use las ideas de esta lista para balancear las calorías, elegir los alimentos que le conviene comer con mayor frecuencia y reducir la cantidad de alimentos que le conviene comer

165

TOMADA DE DECISÃO PARA AÇÃO SOCIAL RESPONSÁVEL NO ENSINO DE CIÊNCIAS  

Microsoft Academic Search

Resumo: O principal objetivo de currículos CTS é o letramento científico e tecnológico para que os alunos possam atuar como cidadãos, tomando decisões e agindo com responsabilidade social. No pre- sente artigo discutiremos o significado dessa meta educacional e apresentaremos uma revisão da litera- tura sobre suas implicações para o ensino de ciências. As considerações apresentadas contribuem para uma melhor

Wildson Luiz Pereira dos Santos; Eduardo Fleury Mortimer

2001-01-01

166

PLANIFICACIÓN COLABORATIVA Y UBICUA PARA EL APRENDIZAJE DEL DISEÑO EN EL SISTEMA DOMOSIM-TPC  

Microsoft Academic Search

Resumen En este artículo, como punto de partida, describimos parte de nuestra experiencia en un caso de estudio particular y sobre un e scenario real en el que se trabaja para resolver una cierta problemática asociada al aprendizaje del diseño domótico. Para este caso de estudio desarrollamos un sistema para el aprendizaje colaborativo basado en los paradigmas de interacción asistida

Miguel A. Redondo; Ana I. Molina; Crescencio Bravo; José Bravo; Manuel Ortega

167

Cómo cuidarse mientras usted cuida a su ser querido: Apoyo para personas que cuidan a un ser querido con cáncer  

Cancer.gov

Un folleto para las personas responsables del cuidado de un ser querido que recibe tratamiento para el cáncer. Ofrece información práctica y apoyo para ayudarlas a sobrellevar este período difícil y estresante.

168

Amazon Land Wars in the South of Para  

NASA Technical Reports Server (NTRS)

The South of Para, located in the heart of the Brazilian Amazon, has become notorious for violent land struggle. Although land conflict has a long history in Brazil, and today impacts many parts of the country, violence is most severe and persistent here. The purpose of this article is to examine why. Specifically, we consider how a particular Amazonian place, the so-called South of Para has come to be known as Brazil's most dangerous badland. We begin by considering the predominant literature, which attributes land conflict to the frontier expansion process with intensified struggle emerging in the face of rising property values and demand for private property associated with capitalist development. From this discussion, we distill a concept of the frontier, based on notions of property rights evolution and locational rents. We then empirically test the persistence of place-based violence in the region, and assess the frontier movement through an analysis of transportation costs. The findings from the analyses indicate that the prevalent theorization of frontier violence in Amazonia does little to explain its persistent and pervasive nature in the South of Para. To fill this gap in understanding, we develop an explanation based the geographic conception of place, and we use contentious politics theory heuristically to elucidate the ways in which general processes interact with place specific history to engender a landscape of violence. In so doing, we focus on environmental, cognitive, and relational mechanisms (and implicated structures), and attempt to deploy them in an explanatory framework that allows direct observation of the accumulating layers of the region's tragic history. We end by placing our discussion within a political ecological context, and consider the implications of the Amazon Land War for the environment.

Simmons, Cynthia S.; Walker, Robert T.; Arima, Eugenio Y.; Aldrich, Stephen P.; Caldas, Marcellus M.

2007-01-01

169

ORTHO-PARA SELECTION RULES IN THE GAS-PHASE CHEMISTRY OF INTERSTELLAR AMMONIA  

SciTech Connect

The ortho-para chemistry of ammonia in the cold interstellar medium is investigated using a gas-phase chemical network. Branching ratios for the primary reaction chain involved in the formation and destruction of ortho- and para-NH{sub 3} were derived using angular momentum rules based on the conservation of the nuclear spin. We show that the 'anomalous' ortho-to-para ratio of ammonia ({approx}0.7) observed in various interstellar regions is in fact consistent with nuclear spin selection rules in a para-enriched H{sub 2} gas. This ratio is found to be independent of temperature in the range 5-30 K. We also predict an ortho-to-para ratio of {approx}2.3 for NH{sub 2}. We conclude that a low ortho-to-para ratio of H{sub 2} naturally drives the ortho-to-para ratios of nitrogen hydrides below the statistical values.

Faure, A.; Hily-Blant, P.; Le Gal, R.; Rist, C. [UJF-Grenoble 1/CNRS-INSU, Institut de Planetologie et d'Astrophysique de Grenoble (IPAG) UMR 5274, Grenoble F-38041 (France); Pineau des Forets, G., E-mail: afaure@obs.ujf-grenoble.fr [Institut d'Astrophysique Spatiale, Universite Paris-Orsay and CNRS, Orsay (France)

2013-06-10

170

Do Well, Be Well with Diabetes 2013 1 Formulario de Registro para Personas con Diabetes Formulario de Registro para Personas con Diabetes 2013  

E-print Network

Do Well, Be Well with Diabetes ­ 2013 1 Formulario de Registro para Personas con Diabetes Formulario de Registro para Personas con Diabetes ­ 2013 Si usted NO TIENE diabetes, por favor NO LLENE este sobre diabetes en el Condado de _______________. D. El código postal en mi casa es __ __ __ __ __. E

171

Do Well, Be Well with Diabetes 2013 1 Formulario de Conclusin para Personas con Diabetes Formulario de Conclusin para Personas con Diabetes 201  

E-print Network

Do Well, Be Well with Diabetes ­ 2013 1 Formulario de Conclusión para Personas con Diabetes Formulario de Conclusión para Personas con Diabetes ­ 201 Si usted NO TIENE diabetes, por favor NO LLENE este últimos cuatro números de mi número telefónico son __ __ __ __. C. Marque todas las clases sobre diabetes

172

NMR Quantum Information Processing with Para-Hydrogen  

E-print Network

This thesis addresses the problems of initialization and separability in liquid state NMR based quantum information processors. We prepare pure quantum states lying above the entanglement threshold. Our pure state quantum computer derives its purity from the highly polarized nuclear spin states in the para-hydrogen molecule. The thesis begins with a critique of conventional NMR based quantum information processing outlining the major strengths and weaknesses of the technology. We describe the enhanced magnetic ordering of the nuclear spin states in para-hydrogen and an initialization experiment exploiting this effect to achieve pure, entangled states. These states can indeed be used as initial states in implementing quantum algorithms: we describe mplementations of the Deutsch and the Grover quantum algorithms. The "twirl" operation converts a completely arbitrary input state to a Werner singlet. The NMR implementation of this operation is taken up. We also analyze the possibility of sharing the purity of some highly polarized qubits in a quantum computer onto quantum subspaces of arbitrary dimensions, and whether these sharing operations increase or decrease the likelihood of entanglement.

M. S. Anwar

2005-09-07

173

ParaText : scalable text analysis and visualization.  

SciTech Connect

Automated analysis of unstructured text documents (e.g., web pages, newswire articles, research publications, business reports) is a key capability for solving important problems in areas including decision making, risk assessment, social network analysis, intelligence analysis, scholarly research and others. However, as data sizes continue to grow in these areas, scalable processing, modeling, and semantic analysis of text collections becomes essential. In this paper, we present the ParaText text analysis engine, a distributed memory software framework for processing, modeling, and analyzing collections of unstructured text documents. Results on several document collections using hundreds of processors are presented to illustrate the exibility, extensibility, and scalability of the the entire process of text modeling from raw data ingestion to application analysis.

Dunlavy, Daniel M.; Stanton, Eric T.; Shead, Timothy M.

2010-07-01

174

[Neurocience in the Junta para Ampliación de Estudios].  

PubMed

The development of the Neurociencias in the Spain at the first third of the 20th century had a strong histological and pathological component. The work of Santiago Ramon and Cajal and Luis Simarro was continued by some excellent disciples: Nicolas Achúcarro, Gonzalo Rodriguez Lafora, Fernando de Castro, etc. Some of them had to make compatible diverse occupations, even the professional exercise of psychiatry, before obtaining a modest - but stable - position of investigation. In spite of some misalignments in the institutional development of the centers and the personal biographical ups and downs, the Junta para Ampliación de Estudios was the great institution that fomented the international formation of the investigators and equipped to them with the means to develop its work. PMID:19845048

Díaz, Alfredo Baratas

2007-01-01

175

Um Framework para a Simulao de Redes Mveis Ad hoc Alexandre Mele & Markus Endler  

E-print Network

Um Framework para a Simulação de Redes Móveis Ad hoc Alexandre Mele & Markus Endler Departamento de, um framework flexível para a prototipação e simulação de protocolos para redes móveis ad hoc. Depois.11. Palavras-chave Redes Móveis Ad hoc, Framework, Simulação, Roteamento, Prototipação de Protocolos #12;Um

Endler, Markus

176

Procedimento para utilizar a assinatura do IB no Webmail 1) Acesse a sua conta no webmail;  

E-print Network

1/5 Procedimento para utilizar a assinatura do IB no Webmail 1) Acesse a sua conta no webmail; 2 clique no ícone imagem; 8) Na tela seguinte, digite a seguinte URL da imagem: www.ib.usp.br/webmail/assinatura.jpg A imagem da assinatura do IB será exibida. Clique em OK para voltar para a tela de configuração e salve

Morandini, Andre C.

177

Modelo 3C de Colaborao para o desenvolvimento de Sistemas Colaborativos  

E-print Network

desenvolvimento: para auxiliar a análise do groupware a ser desenvolvido; no estabelecimento do foco para o desenvolvimento de sucessivas versões do groupware num processo iterativo e investigativo; e para o Groupware, Modelo 3C de Colaboração 1. INTRODU��O A colaboração envolve comunicação, coordenação e

Barbosa, Alberto

178

Jornal de Notcias -Notcias Magazine Quanto vale um diploma para o futuro  

E-print Network

Jornal de Notícias - Notícias Magazine Quanto vale um diploma para o futuro Autor: Catarina Pires parcial #12;Jornal de Notícias - Notícias Magazine Quanto vale um diploma para o futuro Autor: Catarina reprodução, mesmo que parcial #12;Jornal de Notícias - Notícias Magazine Quanto vale um diploma para o futuro

Instituto de Sistemas e Robotica

179

Nueva opción de tratamiento para mujeres jóvenes con cáncer de seno sensible a las hormonas  

Cancer.gov

Un fármaco usado para el tratamiento del cáncer de seno (mama), conocido como exemestano, es más eficaz que tamoxifeno, un fármaco preventivo de uso común para el cáncer de seno, en la prevención de la recidiva del cáncer de seno en mujeres jóvenes que también reciben tratamiento posoperativo para suprimir el funcionamiento ovárico. Los resultados de este estudio se presentaron en mujeres que tenían un tipo de cáncer de seno en estadio inicial sensible al tratamiento hormonal.

180

Desenvolvimento, aplicação e avaliação de um modelo de intervenção positiva para pacientes com miastenia gravis.  

E-print Network

??Essa dissertação objetiva desenvolver, aplicar e avaliar um modelo de intervenção psicológica em grupo baseado nas abordagens cognitivo-comportamental e positiva para pacientes com miastenia gravis.… (more)

Bruna Larissa Seibel

2012-01-01

181

Avaliação de técnicas de diagnóstico para a análise de dados com medidas repetidas.  

E-print Network

??Dentre as possíveis propostas encontradas na literatura estatística para analisar dados oriundos de estudos com observações correlacionadas, estão os modelos condicionais e os modelos marginais.… (more)

Ricardo Salles Kurusu

2013-01-01

182

Features of the ancestral bilaterian inferred from Platynereis dumerilii ParaHox genes  

PubMed Central

Background The ParaHox gene cluster is the evolutionary sister to the Hox cluster. Whilst the role of the Hox cluster in patterning the anterior-posterior axis of bilaterian animals is well established, and the organisation of vertebrate Hox clusters is intimately linked to gene regulation, much less is known about the more recently discovered ParaHox cluster. ParaHox gene clustering, and its relationship to expression, has only been described in deuterostomes. Conventional protostome models (Drosophila melanogaster and Caenorhabditis elegans) are secondarily derived with respect to ParaHox genes, suffering gene loss and cluster break-up. Results We provide the first evidence for ParaHox gene clustering from a less-derived protostome animal, the annelid Platynereis dumerilii. Clustering of these genes is thus not a sole preserve of the deuterostome lineage within Bilateria. This protostome ParaHox cluster is not entirely intact however, with Pdu-Cdx being on the opposite end of the same chromosome arm from Pdu-Gsx and Pdu-Xlox. From the genomic sequence around the P. dumerilii ParaHox genes the neighbouring genes are identified, compared with other taxa, and the ancestral arrangement deduced. Conclusion We relate the organisation of the ParaHox genes to their expression, and from comparisons with other taxa hypothesise that a relatively complex pattern of ParaHox gene expression existed in the protostome-deuterostome ancestor, which was secondarily simplified along several invertebrate lineages. Detailed comparisons of the gene content around the ParaHox genes enables the reconstruction of the genome surrounding the ParaHox cluster of the protostome-deuterostome ancestor, which existed over 550 million years ago. PMID:19627570

Hui, Jerome HL; Raible, Florian; Korchagina, Natalia; Dray, Nicolas; Samain, Sylvie; Magdelenat, Ghislaine; Jubin, Claire; Segurens, Béatrice; Balavoine, Guillaume; Arendt, Detlev; Ferrier, David EK

2009-01-01

183

Ortho-para mixing hyperfine interaction in the H2O+ ion and nuclear spin equilibration.  

PubMed

The ortho to para conversion of water ion, H2O(+), due to the interaction between the magnetic moments of the unpaired electron and protons has been theoretically studied to calculate the spontaneous emission lifetime between the ortho- and para-levels. The electron spin-nuclear spin interaction term, Tab(Sa?Ib + Sb?Ia) mixes ortho (I = 1) and para (I = 0) levels to cause the "forbidden" ortho to para |?I| = 1 transition. The mixing term with Tab = 72.0 MHz is 4 orders of magnitude higher for H2O(+) than for its neutral counterpart H2O where the magnetic field interacting with proton spins is by molecular rotation rather than the free electron. The resultant 10(8) increase of ortho to para conversion rate possibly makes the effect of conversion in H2O(+) measurable in laboratories and possibly explains the anomalous ortho to para ratio recently reported by Herschel heterodyne instrument for the far-infrared (HIFI) observation. Results of our calculations show that the ortho ? para mixings involving near-degenerate ortho and para levels are high (?10(-3)), but they tend to occur at high energy levels, ?300 K. Because of the rapid spontaneous emission, such high levels are not populated in diffuse clouds unless the radiative temperature of the environment is very high. The low-lying 101 (para) and 111 (ortho) levels of H2O(+) are mixed by ?10(-4) making the spontaneous emission lifetime for the para 101 ? ortho 000 transition 520 years and 5200 years depending on the F value of the hyperfine structure. Thus the ortho ? para conversion due to the unpaired electron is not likely to seriously affect thermalization of interstellar H2O(+) unless either the radiative temperature is very high or number density of the cloud is very low. PMID:23530629

Tanaka, Keiichi; Harada, Kensuke; Oka, Takeshi

2013-10-01

184

Ortho-Para Mixing Hyperfine Interaction in the H2O+ Ion and Nuclear Spin Equilibration  

NASA Astrophysics Data System (ADS)

The ortho to para conversion of water ion, H2O+, due to the interaction between the magnetic moments of the unpaired electron and protons has been theoretically studied to calculate the spontaneous emission lifetime between the ortho- and para-levels. The electron spin-nuclear spin interaction term, Tab(Sa-Ib + Sb-Ia) mixes ortho (I = 1) and para (I = 0) levels to cause the -forbidden- ortho to para |-I| = 1 transition. The mixing term with Tab = 72.0 MHz is 4 orders of magnitude higher for H2O+ than for its neutral counterpart H2O where the magnetic field interacting with proton spins is by molecular rotation rather than the free electron. The resultant 108 increase of ortho to para conversion rate possibly makes the effect of conversion in H2O+ measurable in laboratories and possibly explains the anomalous ortho to para ratio recently reported by Herschel heterodyne instrument for the far-infrared (HIFI) observation. Results of our calculations show that the ortho - para mixings involving near-degenerate ortho and para levels are high (-10-3), but they tend to occur at high energy levels, -300 K. Because of the rapid spontaneous emission, such high levels are not populated in diffuse clouds unless the radiative temperature of the environment is very high. The low-lying 101 (para) and 111 (ortho) levels of H2O+ are mixed by -10-4 making the spontaneous emission lifetime for the para 101 - ortho 000 transition 520 years and 5200 years depending on the F value of the hyperfine structure. Thus the ortho - para conversion due to the unpaired electron is not likely to seriously affect thermalization of interstellar H2O+ unless either the radiative temperature is very high or number density of the cloud is very low.

Tanaka, Keiichi; Harada, Kensuke; Oka, Takeshi

2013-10-01

185

Analise de Mecanismos de CAC para Redes ATM Michel Ferreira Abdalla  

E-print Network

An´alise de Mecanismos de CAC para Redes ATM Michel Ferreira Abdalla Department of Computer Science~ao em redes ATM. Uma classifica¸c~ao destes mecanismos baseada no princ´ipio impl´icito neles utilizado encontrar em redes ATM, estes mecanismos apre- sentam resultados bastante superestimados para a capaci- dade

Abdalla, Michel Ferreira

186

Opciones de cirugía para mujeres con CDIS o con cáncer de seno  

Cancer.gov

Contiene información sobre los tipos de cirugía de seno, como la operación para conservar el seno y la mastectomía, y ayuda a las mujeres diagnosticadas con CDIS o con cáncer de seno a decidir cuál cirugía es la más conveniente para ellas.

187

Acumulación de capital humano y gasto público en educación: un modelo de generaciones traslapadas para Colombia  

Microsoft Academic Search

En el presente documento se estudia el impacto del gasto público en educación sobre el crecimiento económico y el bienestar, para lo cual se construye un modelo de generaciones traslapadas y crecimiento endógeno. Los agentes se educan con el fin de acumular capital humano, mientras el gobierno subsidia una fracción del gasto en educación. Los parámetros son calibrados para replicar

Oliver Pardo

2006-01-01

188

DESCENTRALIZACIÓN Y GASTO PÚBLICO SOCIAL EN EDUCACIÓN Y SALUD PARA MUESTRA MUNICIPAL DE SANTANDER 1997 - 2005  

Microsoft Academic Search

Este documento registra la cobertura de los servicios de educación y salud para una muestra de diecinueve municipios del departamento de Santander en el periodo 1997-2005, analizada bajo el efecto de la política de descentralización implementada en Colombia desde comienzos de los años ochenta. Los resultados más importantes muestran, que los niveles de cobertura para estos dos servicios crecieron de

Amilcar Mojica Pimiento

2010-01-01

189

FUNDAMENTOS TEÓRICOS DE LA COORDINACIÓN COMO PREMISA ESENCIAL PARA DESARROLLAR EL TRABAJO SOCIOCULTURAL COMUNITARIO  

Microsoft Academic Search

La cultura como conjunto de relaciones humanas que ha transcendido en el tiempo y que le permite al hombre conservar, reproducir, crear nuevos conocimientos y valores para la transformación de su medio social y cultural, cada día cobra mayor importancia como sostén fundamental para la satisfacción de las necesidades espirituales y como elemento de influencia directa en la producción de

Ricardo Basilio Enoa Leyva

2010-01-01

190

Rate of para-aortic lymph node micrometastasis in patients with locally advanced cervical cancer  

PubMed Central

Objective Patients with micrometastasis to para-aortic lymph nodes may benefit from extended field chemoradiation. To determine the rate of para-aortic node micrometastasis in patients with locally advanced cervical cancer undergoing laparoscopic extraperitoneal para-aortic lymphadenectomy Methods We prospectively identified consecutive patients diagnosed with stage IB2-IVA biopsy-proven cervical cancer. Eligible patients included those who were candidates for treatment with radiotherapy and concurrent chemotherapy and had no evidence of para-aortic lymphadenopathy (all lymph nodes < 2 cm in diameter) by preoperative computed tomography or magnetic resonance imaging. All patients underwent preoperative positron emission tomography/computed tomography and laparoscopic extraperitoneal para-aortic lymphadenectomy. All lymph nodes were assessed for metastasis by routine hematoxylin-eosin (H&E) staining. Ultrastaging (serial sectioning) and immunohistochemical analysis were performed in H&E-negative specimens. Results Thirteen (22%) of 60 consecutive patients had para-aortic lymph node metastases detected on routine H&E staining. Of the remaining 47 patients, one (2.1%) had evidence of micrometastasis, which was detected by ultrastaging. This patient completed whole pelvic radiotherapy and chemotherapy but had a recurrence 27 months after completion of therapy. Conclusions The rate of para-aortic node micrometastasis in patients with locally advanced cervical cancer is low. The role of routine ultrastaging and immunohistochemical analysis in such patients remains uncertain. Future studies are needed to determine the clinical impact of para-aortic node micrometastasis in patients with locally advanced cervical cancer. PMID:20837355

Zand, Behrouz; Euscher, Elizabeth D.; Soliman, Pamela T.; Schmeler, Kathleen M.; Coleman, Robert L.; Frumovitz, Michael; Jhingran, Anuja; Ramondetta, Lois M.; Ramirez, Pedro T.

2014-01-01

191

REDES-Revista hispana para el anlisis de redes sociales Vol.17,#13, Diciembre 2009  

E-print Network

REDES- Revista hispana para el análisis de redes sociales Vol.17,#13, Diciembre 2009 http://revista-redes. Palabras clave: Apoyo social ­ Inmigrantes ­ Redes personales. Abstract This paper summarises part of our, alteridad y nueva esfera social, 257-276. Universidad de Valencia: Valencia. #12;REDES- Revista hispana para

Boyer, Edmond

192

Formulación de alimentos para celíacos con base en mezclas de harinas de quínoa, cereales y almidones  

Microsoft Academic Search

RESUMEN. Se formularon alimentos sin gluten para celíacos en base a mezclas de harina de quínoa (Chenopodium quinoa), arroz y maíz con almidones. Para la formulación de estos alimentos se usó la herramienta informática (ALIM V1.0) desarrollada por los auto- res. Se obtuvieron panqueques, scones, prepizza y pan, los cuales fueron evaluados en composición química (proteínas, grasas, ceni- zas, fibras,

Valeria Del Castillo; Gerardo Lescano; Margarita Armada

193

ParaScale: Exploiting Parametric Timing Analysis for Real-Time Schedulers and Dynamic Voltage Scaling  

E-print Network

ParaScale: Exploiting Parametric Timing Analysis for Real-Time Schedulers and Dynamic Voltage for dynamic power conservation by exploiting parametric loop bounds for ParaScale, our intra-task dynamic voltage scaling (DVS) approach. Our results demonstrate that the parametric approach to timing analysis

Mueller, Frank

194

O CONCEITO DE EMANCIPAÇÃO COMO FUNDAMENTO PARA UMA TEORIA DA EDUCAÇÃO EM JÜRGEN HABERMAS  

Microsoft Academic Search

Neste breve artigo pretendemos apresentar elementos que possam ser sugestivos e indicativos para a fundamentação de uma teoria da educação a partir da compreensão do processo de esclarecimento enquanto processo de emancipação do homem na sociedade contemporânea. Sabemos que Jürgen Habermas propõe o recurso ao entendimento mútuo como meio para se chegar a um entendimento e se obter um consenso,

Bartolomeu Leite da Silva

2010-01-01

195

O pragmatismo em economia : bases filosóficas para uma interpretação do discurso econômico  

Microsoft Academic Search

O trabalho tem por objetivo trazer elementos da corrente filosófica do pragmatismo para a discussão metodológica em economia, particularmente no que diz respeito a teoria da verdade e suas implicações para o debate epistemológico. Após apresentar as contribuições dos pioneiros do pragmatismo William James, John Dewey e Charles S. Peirce e discutir aspectos da obra de W. Quine e Richard

Paulo Sérgio de Oliveira Simões Gala; Danilo Fernandes Araújo; José Márcio Rego

2004-01-01

196

Updated Fall 2014 Recomendaciones para el Manejo de la Mosca de Alas Manchadas (SWD) en  

E-print Network

Updated Fall 2014 Recomendaciones para el Manejo de la Mosca de Alas Manchadas (SWD) en los Gómez-Rodas. La Drosófila de las alas manchadas (SWD) es una plaga invasora que ataca las frutillas sitio de Internet www.ipm.msu.edu/SWD.htm donde encontrará hojas desplegables, guías para la

Isaacs, Rufus

197

The parA resolvase performs site-specific genomic excision in Arabidopsis  

Technology Transfer Automated Retrieval System (TEKTRAN)

We have designed a site-specific excision detection system in Arabidopsis to study the in planta activity of the small serine recombinase ParA. Using a transient expression assay as well as stable transgenic plant lines, we show that the ParA recombinase is catalytically active and capable of perfo...

198

Uma Estratégia para a Visualização do Céu e seus Elementos em Jogos  

Microsoft Academic Search

Resumo Uma visualização convincente do céu e seus elementos (nuvens, sol, lua, estrelas) é fundamental para agregar realismo aos jogos que usam cenários em ambientes externos. Como uma simulação precisa desses efeitos pode ser computacionalmente muito cara, muitos jogos empregam artifícios, visualizando o céu como texturas mapeadas em esferas e caixas envolventes. Neste trabalho, apresentamos uma estratégia simples para simular

MARCIO PEREIRA DE ARAUJO; WALDEMAR CELES

199

Livro de actividades em ToonTalk para o pré-escolar  

Microsoft Academic Search

Como orientação para os educadores, foi desenvolvido um conjunto de actividades adequadas a contextos de educação pré-escolar (crianças dos 3 aos 5 anos, na presença de educadores), que se apoiam no videojogo - ou videobrinquedo - ToonTalk. Para permitir uma fácil compreensão e acompanhamento por parte de crianças e educadores, foi então desenvolvida uma forma gráfica de transmitir essas actividades,

Leonel Morgado; Maria Gabriel Bulas Cruz; Ana Teresa Tavares; Christophe Moura

200

SNIFFER: Um Ambiente Computacional para Gerenciamento de Experimentos de Aprendizado de Maquina Supervisionado  

E-print Network

SNIFFER: Um Ambiente Computacional para Gerenciamento de Experimentos de Aprendizado de M vasta literatura em Estat´istica, Teoria de Aprendizado Computacional e outras ´areas afins, a ´ultima computacional para gerenciar avaliac¸~oes e comparac¸~oes experimentais em AM supervisionado, denominado

Batista, Gustavo

201

A Para-Canalicular Abscess Resembling an Inflamed Chalazion  

PubMed Central

Background. Lacrimal infections by Actinomyces are rare and commonly misdiagnosed for long periods of time. They account for 2% of all lacrimal diseases. Case Report. We report a case of a 70-year-old female patient suffering from a para-canalicular abscess in the medial canthus of the left eye, beside the lower punctum lacrimale, resembling a chalazion. Purulence exited from the punctum lacrimale due to inflammation of the inferior canaliculus (canaliculitis). When pressure was applied to the mass, a second exit of purulence was also observed under the palpebral conjunctiva below the lacrimal caruncle. A surgical excision was performed followed by administration of local antibiotic therapy. The histopathological examination of the extracted mass revealed the existence of actinomycosis. Conclusion. Persistent or recurrent infections and lumps of the eyelids should be thoroughly investigated. Actinomyces as a causative agent should be considered. Differential diagnosis is broad and should include canaliculitis, chalazion, and multiple types of neoplasias. For this reason, in nonconclusive cases, a histopathological examination should be performed. PMID:23762696

Almaliotis, Diamantis; Nakos, Elias; Siempis, Thomas; Koletsa, Triantafyllia; Kostopoulos, Ioannis; Chatzipantazi, Maria; Karampatakis, Vasileios

2013-01-01

202

Para-hydrogen induced polarization in heterogeneous hydrogenationreactions  

SciTech Connect

We demonstrate the creation and observation ofpara-hydrogen-induced polarization in heterogeneous hydrogenationreactions. Wilkinson's catalyst, RhCl(PPh3)3, supported on eithermodified silica gel or a polymer, is shown to hydrogenate styrene intoethylbenzene and to produce enhanced spin polarizations, observed throughNMR, when the reaction was performed with H2 gas enriched in the paraspinisomer. Furthermore, gaseous phase para-hydrogenation of propylene topropane with two catalysts, the Wilkinson's catalyst supported onmodified silica gel and Rh(cod)(sulfos) (cod = cycloocta-1,5-diene;sulfos) - O3S(C6H4)CH2C(CH2PPh2)3) supported on silica gel, demonstratesheterogeneous catalytic conversion resulting in large spin polarizations.These experiments serve as a direct verification of the mechanism ofheterogeneous hydrogenation reactions involving immobilized metalcomplexes and can be potentially developed into a practical tool forproducing catalyst-free fluids with highly polarized nuclear spins for abroad range of hyperpolarized NMR and MRI applications.

Koptyug, Igor V.; Kovtunov, Kirill; Burt, Scott R.; Anwar, M.Sabieh; Hilty, Christian; Han, Song-I; Pines, Alexander; Sagdeev, Renad Z.

2007-01-31

203

Para-dichlorobenzene toxicity – a review of potential neurotoxic manifestations  

PubMed Central

Background: Para-dichlorobenzene (PDCB) is an active ingredient of mothballs, deodorizers and fumigants. Due to the easy availability of this chemical, there is a considerable risk for accidental or intentional toxic exposure. Recently, multiple cases of PDCB toxicity due to mothball ingestion were reported. PDCB toxicity can affect multiple organ systems including liver, kidneys, skin, lung and the central nervous system (CNS). CNS toxicity often results in leukoencephalopathy and heterogeneous neurological manifestations. Objectives: The objective of this study was to illustrate the clinical presentation, imaging findings, diagnosis and management of PDCB toxicity. Methods: We carried out a literature review of the pharmacological and toxicological properties of PDCB. Conclusions: PDCB and other aromatic hydrocarbons are capable of CNS tissue damage and in promoting functional neurological decline. While very little is currently known about prevalence of PDCB addiction, it cannot be ruled out that its illicit use among young people is under-recognized. The number of cases of PDCB toxicity might also rise due to the increasing industrial and domestic use of this chemical. PMID:24790648

Dubey, Divyanshu; Sharma, Vibhash D.; Pass, Steven E.; Sawhney, Anshudha

2014-01-01

204

Phase diagram for ortho-para-hydrogen monolayers  

NASA Astrophysics Data System (ADS)

The phase diagram for orientational ordering of hydrogen monolayers on graphite and boron nitride is revised in view of current theory and experimental observations from nuclear magnetic resonance (NMR) studies recently reported for ortho-H2 concentrations 0.35 ? c ? 0.92 and temperatures 0.14 ? T ? 1.80 K. The characteristic interaction coupling ?0 = 0.50 ± 0.03 K and the crystalline field amplitude V0 = 0.70 ± 0.10 K are derived from experimental data, and distinct types of the local orientationally ordered structures are analysed using a proposed model for site-diluted uniaxial quadrupoles on a triangular plane lattice of hexagonal symmetry. The long-range periodic pinwheel structure and the short-range quadrupolar glass (QG) phase are stable above the 2D site-percolation limit, cp = 0.72, and for 0.48 < c < cp, respectively, where quadrupolar-order effects dominate. At very low T, the QG phase shows instability with respect to local dipole-like polarization effects and the ground state changes to a hindered rotor state. Two para-rotational local ordered PRA and PRB structures driven, respectively, by positive and negative crystalline fields are well distinguished, experimentally and theoretically, and are rather different from the unique PR phase suggested earlier by Harris and Berlinsky.

Sullivan, N. S.; Kokshenev, V. B.

2003-04-01

205

New gene responsible for para-aminobenzoate biosynthesis.  

PubMed

Folate is an essential cofactor in all living cells for one-carbon transfer reactions. para-Aminobenzoate (pABA), a building block of folate, is usually derived from chorismate in the shikimate pathway by reactions of aminodeoxychorismate synthase (PabA and -B) and 4-amino-4-deoxychorismate lyase (PabC). We previously suggested that an alternative pathway for pABA biosynthesis would operate in some microorganisms such as Lactobacillus fermentum and Nitrosomonas europaea since these bacteria showed a prototrophic phenotype to pABA despite the fact that there are no orthologs of pabA, -B, and -C in their genome databases. In this study, a gene of unknown function, NE1434, was obtained from N. europaea by shotgun cloning using a pABA-auxotrophic Escherichia coli mutant (?pabABC) as a host. A tracer experiment using [U-(13)C6]glucose suggested that pABA was de novo synthesized in the transformant. An E. coli ?pabABC?aroB mutant carrying the NE1434 gene exhibited a prototrophic phenotype to pABA, suggesting that compounds in the shikimate pathway including chorismate were not utilized as substrates by NE1434. Moreover, the CT610 gene, an ortholog of NE1434 located in the folate biosynthetic gene cluster in Chlamydia trachomatis, also complemented pABA-auxotrophic E. coli mutants. Taken together, these results suggest that NE1434 and CT610 participate in pABA biosynthesis. PMID:23972426

Satoh, Yasuharu; Kuratsu, Masahiro; Kobayashi, Daiki; Dairi, Tohru

2014-02-01

206

Para-nitrobenzyl esterases with enhanced activity in aqueous and nonaqueous media  

DOEpatents

A method for isolating and identifying modified para-nitrobenzyl esterases which exhibit improved stability and/or esterase hydrolysis activity toward selected substrates and under selected reaction conditions relative to the unmodified para-nitrobenzyl esterase. The method involves preparing a library of modified para-nitrobenzyl esterase nucleic acid segments (genes) which have nucleotide sequences that differ from the nucleic acid segment which encodes for unmodified para-nitrobenzyl esterase. The library of modified para-nitrobenzyl nucleic acid segments is expressed to provide a plurality of modified enzymes. The clones expressing modified enzymes are then screened to identify which enzymes have improved esterase activity by measuring the ability of the enzymes to hydrolyze the selected substrate under the selected reaction conditions. Specific modified para-nitrobenzyl esterases are disclosed which have improved stability and/or ester hydrolysis activity in aqueous or aqueous-organic media relative to the stability and/or ester hydrolysis activity of unmodified naturally occurring para-nitrobenzyl esterase.

Arnold, Frances H. (Pasadena, CA); Moore, Jeffrey C. (Pasadena, CA)

1998-01-01

207

Para-nitrobenzyl esterases with enhanced activity in aqueous and nonaqueous media  

DOEpatents

A method is disclosed for isolating and identifying modified para-nitrobenzyl esterases which exhibit improved stability and/or esterase hydrolysis activity toward selected substrates and under selected reaction conditions relative to the unmodified para-nitrobenzyl esterase. The method involves preparing a library of modified para-nitrobenzyl esterase nucleic acid segments (genes) which have nucleotide sequences that differ from the nucleic acid segment which encodes for unmodified para-nitrobenzyl esterase. The library of modified para-nitrobenzyl nucleic acid segments is expressed to provide a plurality of modified enzymes. The clones expressing modified enzymes are then screened to identify which enzymes have improved esterase activity by measuring the ability of the enzymes to hydrolyze the selected substrate under the selected reaction conditions. Specific modified para-nitrobenzyl esterases are disclosed which have improved stability and/or ester hydrolysis activity in aqueous or aqueous-organic media relative to the stability and/or ester hydrolysis activity of unmodified naturally occurring para-nitrobenzyl esterase. 43 figs.

Arnold, F.H.; Moore, J.C.

1999-05-25

208

Para-nitrobenzyl esterases with enhanced activity in aqueous and nonaqueous media  

DOEpatents

A method for isolating and identifying modified para-nitrobenzyl esterases which exhibit improved stability and/or esterase hydrolysis activity toward selected substrates and under selected reaction conditions relative to the unmodified para-nitrobenzyl esterase. The method involves preparing a library of modified para-nitrobenzyl esterase nucleic acid segments (genes) which have nucleotide sequences that differ from the nucleic acid segment which encodes for unmodified para-nitrobenzyl esterase. The library of modified para-nitrobenzyl nucleic acid segments is expressed to provide a plurality of modified enzymes. The clones expressing modified enzymes are then screened to identify which enzymes have improved esterase activity by measuring the ability of the enzymes to hydrolyze the selected substrate under the selected reaction conditions. Specific modified para-nitrobenzyl esterases are disclosed which have improved stability and/or ester hydrolysis activity in aqueous or aqueous-organic media relative to the stability and/or ester hydrolysis activity of unmodified naturally occurring para-nitrobenzyl esterase.

Arnold, Frances H. (Pasadena, CA); Moore, Jeffrey C. (Pasadena, CA)

1999-01-01

209

Para-nitrobenzyl esterases with enhanced activity in aqueous and nonaqueous media  

DOEpatents

A method is disclosed for isolating and identifying modified para-nitrobenzyl esterases. These enzymes exhibit improved stability and/or esterase hydrolysis activity toward selected substrates and under selected reaction conditions relative to the unmodified para-nitrobenzyl esterase. The method involves preparing a library of modified para-nitrobenzyl esterase nucleic acid segments (genes) which have nucleotide sequences that differ from the nucleic acid segment which encodes for unmodified para-nitrobenzyl esterase. The library of modified para-nitrobenzyl nucleic acid segments is expressed to provide a plurality of modified enzymes. The clones expressing modified enzymes are then screened to identify which enzymes have improved esterase activity by measuring the ability of the enzymes to hydrolyze the selected substrate under the selected reaction conditions. Specific modified para-nitrobenzyl esterases are disclosed which have improved stability and/or ester hydrolysis activity in aqueous or aqueous-organic media relative to the stability and/or ester hydrolysis activity of unmodified naturally occurring para-nitrobenzyl esterase. 43 figs.

Arnold, F.H.; Moore, J.C.

1998-04-21

210

"How Much Economic Value Does My Credential Have?": Reformulating Tinto's Model to Study Students' Persistence in Community Colleges  

ERIC Educational Resources Information Center

Community colleges play a key role in educating the large number of non-traditional, low-income, and under-prepared students who have entered higher education in the past several decades. Despite increased access, community colleges are struggling to graduate students. Most, if not all, strategies provided by scholars to improve college completion…

Stuart, G. Rob; Rios-Aguilar, Cecilia; Deil-Amen, Regina

2014-01-01

211

All the three ParaHox genes are present in Nuttallochiton mirandus (Mollusca: polyplacophora): evolutionary considerations.  

PubMed

The ParaHox gene cluster contains three homeobox genes, Gsx, Xlox and Cdx and has been demonstrated to be an evolutionary sister of the Hox gene cluster. Among deuterostomes the three genes are found in the majority of taxa, whereas among protostomes they have so far been isolated only in the phylum Sipuncula. We report the partial sequences of all three ParaHox genes in the polyplacophoran Nuttallochiton mirandus, the first species of the phylum Mollusca where all ParaHox genes have been isolated. This finding has phylogenetic implications for the phylum Mollusca and for its relationships with the other lophotrochozoan taxa. PMID:16331637

Barucca, Marco; Biscotti, Maria A; Olmo, Ettore; Canapa, Adriana

2006-03-15

212

Endovascular Treatment of a Ruptured Para-Anastomotic Aneurysm of the Abdominal Aorta  

SciTech Connect

We report a case of a ruptured para-anastomotic aortic aneurysm treated with implantation of a bifurcated stent-graft. A 72-year-old patient, who had undergone aortobifemoral bypass for aortoiliac occlusive disease 16 years ago, presented with a ruptured para-anastomotic aortic aneurysm. A bifurcated stent-graft was successfully deployed into the old bifurcated graft. This is the first report of a bifurcated stent-graft being placed through an 'end-to-side' anastomosed old aortobifemoral graft. Endovascular treatment of ruptured para-anastomotic aortic aneurysms can be accomplished successfully, avoiding open surgery which is associated with increased mortality and morbidity.

Sfyroeras, Giorgos S.; Lioupis, Christos, E-mail: lioupisC@vodafone.net.gr; Bessias, Nikolaos; Maras, Dimitris [Red Cross Hospital of Athens, Department of Vascular Surgery (Greece); Pomoni, Maria [Red Cross Hospital of Athens, Department of Radiology (Greece); Andrikopoulos, Vassilios [Red Cross Hospital of Athens, Department of Vascular Surgery (Greece)

2008-07-15

213

Time is of the essence for ParaHox homeobox gene clustering.  

PubMed

ParaHox genes, and their evolutionary sisters the Hox genes, are integral to patterning the anterior-posterior axis of most animals. Like the Hox genes, ParaHox genes can be clustered and exhibit the phenomenon of colinearity - gene order within the cluster matching gene activation. Two new instances of ParaHox clustering provide the first examples of intact clusters outside chordates, with gene expression lending weight to the argument that temporal colinearity is the key to understanding clustering. PMID:23803337

Garstang, Myles; Ferrier, David E K

2013-01-01

214

Time is of the essence for ParaHox homeobox gene clustering  

PubMed Central

ParaHox genes, and their evolutionary sisters the Hox genes, are integral to patterning the anterior-posterior axis of most animals. Like the Hox genes, ParaHox genes can be clustered and exhibit the phenomenon of colinearity - gene order within the cluster matching gene activation. Two new instances of ParaHox clustering provide the first examples of intact clusters outside chordates, with gene expression lending weight to the argument that temporal colinearity is the key to understanding clustering. See research articles: http://www.biomedcentral.com/1741-7007/11/68 and http://www.biomedcentral.com/1471-2148/13/129 PMID:23803337

2013-01-01

215

Dinâmica molecular de hidrolases para sacarificação : de celulose e proteínas correlatas.  

E-print Network

??A biomassa lignocelulósica proveniente do bagaço de cana-de-açúcar e de outras matérias-primas é um material altamente promissor para a geração de biocombustíveis renováveis e ambientalmente… (more)

Érica Teixeira Prates

2013-01-01

216

Controlling the Regiospecific Oxidation of Aromatics via Active Site Engineering of Toluene para-Monooxygenase of  

E-print Network

-Monooxygenase of Ralstonia pickettii PKO1* Received for publication, September 8, 2004, and in revised form, October 18, 2004- and dihydroxy- lated products. Toluene para-monooxygenase (TpMO,1 formerly known as T3MO) of Ralstonia pickettii

Wood, Thomas K.

217

Lo que usted debe saber antes de dar sus tejidos para investigación médica  

Cancer.gov

Contiene información sobre las cosas que usted debe saber y tener en cuenta al tomar una decisión de donar sus tejidos para investigación. El tejido puede incluir materiales de su cuerpo tales como piel, cabello, uñas, sangre y orina.

218

Desenvolvimento de Sistemas e Servios para a Internet com Interface WWW Jos Luis Borbinha*  

E-print Network

MODELO COMPUTACIONAL DO WWW O modelo computacional do WWW baseia-se no modelo cliente-servidor conforme Especializado Servidor WWW Figura 1: O modelo computacional WWW. O HTTP é bastante adequado para a pesquisa e

da Silva, Alberto Rodrigues

219

Curing of some epoxy-acrylate glycidyl ethers based on para-alkyl substituted phenols  

Microsoft Academic Search

Curing of epoxy-acrylate glycidyl ethers based on phenol and para-alkyl [?CH3, ?C(CH3)3, ?C9H19] substituted phenols in the presence of benzoyl peroxide was examined by differential scanning calorimetry at different heating rates. The tested monomers polymerize first as acrylic monomers and the reaction continues by the curing process only in the case of the epoxy-acrylate glycidyl ethers of para-alkyl substituted phenols,

C. N. Ca?caval; D. Ro?u; A. Stoleriu

1997-01-01

220

Synthesis and spectral studies of 2-aminopyridinium para-nitrobenzoate: A novel optoelectronic crystal  

Microsoft Academic Search

A new crystal 2-aminopyridinium para-nitro benzoate (C5H7N2+·C7H4NO4?) has been synthesized by the reaction of 2-aminopyridine with para-nitro benzoic acid by slow evaporation method. As synthesized crystals have been characterized by X-ray diffraction (XRD), Fourier transformed infrared (FTIR), and Ultra violet (UV) spectral studies. The XRD and FTIR results indicated that the synthesized compound has the crystal structure of monoclinic with

Bhuvana K. Periyasamy; Robinson S. Jebas; Balasubramanian Thailampillai

2007-01-01

221

MiCCS4Mobile Middleware para Comunicao e Coordenao Segura em Redes Ad-hoc  

E-print Network

MiCCS4Mobile Middleware para Comunicação e Coordenação Segura em Redes Ad-hoc com Participantes desenvolvimento de aplicações móveis. Algumas aplicações exploram protocolos de redes sem fios e a mobilidade dos dispositivos para aumentar as suas funciona- lidades. A classe de protocolos de redes sem fios com dispositivos

Neves, Nuno

222

Arquitectura del Sistema de Gestin del ancho de Banda y Proteccin (SGBP) para entornos de redes  

E-print Network

Arquitectura del Sistema de Gestión del ancho de Banda y Protección (SGBP) para entornos de redes de banda y protección para entornos de redes MPLS. El sistema está formado por dos módulos, el de de banda. 1. Introducción La evolución de las tecnologías de las comunicaciones hacia redes de

Ortega, Eusebi Calle

223

Metronet: software para mediciÛn de calidad de servicio en voz y video  

Microsoft Academic Search

ó El proyecto Metronet se propuso como objetivos desarrollar una metodologÌa y un software para medir los dife- rentes parÆmetros de calidad de servicio (QoS) en aplicaciones de voz y video. El proyecto se realizÛ avanzando en forma casi paralela en la investigaciÛn teÛrica con simuladores, la construcciÛn de prototipos para vericaciÛn en redes reales de los resultados teÛricos y

Pablo Belzarena; Federico Larroca

224

APLICACIÓN DE UNA ZEOLITA PRE-TRATADA PARA MINIMIZAR EL IMPACTO DE LA CONTAMINACION CON ARSENICO  

Microsoft Academic Search

Se han reconocido a las zeolitas y a los metales o compuestos metálicos como adsorbentes selectivos para cationes y aniones de soluciones acuosas para minimizar el impacto de algunos contaminantes en el medio ambiente. Los óxidos como MgO, CaO y ZnO, pueden dispersarse en las cavidades de las zeolitas e incrementar sus propiedades. Actualmente existen diversas formas de aplicación como,

FLERIDA A. MEJÍA ZAMUDIO; JESUS L. VALENZUELA GARCÍA

2009-01-01

225

ParaLearn: a massively parallel, scalable system for learning interaction networks on FPGAs  

Microsoft Academic Search

ParaLearn is a scalable, parallel FPGA-based system for learning interaction networks using Bayesian statistics. ParaLearn includes problem specific parallel\\/scalable algorithms, system software and hardware architecture to address this complex problem. Learning interaction networks from data uncovers causal relationships and allows scientists to predict and explain a system's behavior. Interaction networks have applications in many fields, though we will discuss them

Narges Bani Asadi; Christopher W. Fletcher; Greg Gibeling; John Wawrzynek; Wing H. Wong; Garry P. Nolan; Zoey Zhou

2010-01-01

226

Los CDC harn pruebas para detectar formaldehdo en casas mviles y trileres  

E-print Network

Los CDC harán pruebas para detectar formaldehído en casas móviles y tráileres A solicitud de FEMA dehído en un total de 500 casas móviles y tráileres entregados por FEMA. Los CDC harán estas pruebas en viviendas. Además, los resultados de estas pruebas ayudarán a FEMA a buscar otras opciones de vivienda para

227

DOI: 10.1002/cphc.200700061 Separation of ortho-and para-  

E-print Network

levels are go =3 and gp =1 for oH2 and pH2, respectively. The rotational angular momentum j of H2 can of the Universe[4] and critical for fundamental studies of low-temperature physics.[1] The lower- energy para. The total nuclear spin of para-hydrogen, pH2, is zero, while the total nuclear spin of ortho-hydrogen, oH2

Krems, Roman

228

ComFiM -Um Jogo Colaborativo para Estimular a Comunicao de Crianas com Autismo  

E-print Network

ComFiM - Um Jogo Colaborativo para Estimular a Comunicação de Crianças com Autismo Paula Ceccon desenvolvimento e a avalia¸c~ao de um jogo colaborativo chamado ComFiM, para interfa- ces m´oveis tang´iveis. O jogo foi desenvolvido com base nos requisitos de um grupo de crian¸cas com autismo, visando estimular

Barbosa, Alberto

229

CantoblancoNoticias de la Universidad Autnoma de Madrid Universitario para  

E-print Network

para Mayores (PUMA) 4 Premio de Medio Ambiente 5 Actividades Culturales 6 La república de las mujeres 7 Universitario para Mayores (PUMA), cuya confe- rencia de apertura, La percepción de los problemas sociales en la Sociológicas (CIS) y catedrá- tico de la Facultad de Derecho de la UAM. El PUMA, que inició su andadura el

Autonoma de Madrid, Universidad

230

Physisorption and ortho-para conversion of molecular hydrogen on solid surfaces  

NASA Astrophysics Data System (ADS)

Molecular hydrogen exists in nuclear-spin isomers of ortho and para species according to the total nuclear spin. These species are correlated to the rotational states with even and odd rotational quantum numbers because of the symmetry of the total wavefunction with respect to the permutation of the two nuclei. Although interconversion between the ortho and para states is extremely slow in an isolated state, the conversion is promoted in a physisorption state via interaction with surfaces of not only magnetic but also diamagnetic materials. In a physisorption state, the rotational motion of hydrogen molecules is modified due to the potential anisotropy. The physisorption properties and interconversion rate of the ortho and para hydrogen have recently been investigated on well-defined surfaces, which allow detailed comparison with theory. Furthermore, relative abundance of the ortho and para hydrogen in astronomical circumstances has been reported in recent years, which often shows a value out of equilibrium with the environment temperature. Physisorption and ortho-para conversion on the surfaces of interstellar media are expected to enable deeper understanding of astronomical phenomena. In this article, we review recent progress of experimental and theoretical studies on the physisorption and ortho-para conversion of molecular hydrogen and its relevance to the recent astronomical observation.

Fukutani, K.; Sugimoto, T.

2013-12-01

231

Estimación de la senda óptima de extracción para un recurso natural no renovable: caso de estudio para la actividad carbonífera a cielo abierto en el  

Microsoft Academic Search

la economía de los recursos naturales, permite conocer la forma como se extrae sosteniblemente un recurso natural renovable y no renovable. De esta forma, el presente estudio con información financiera y sobre costos totales de producción (estimados mediante un modelo de datos panel con efectos aleatorios), para siete principales empresas explotadoras de carbón en el centro del departamento del Cesar,

Jorge Andrés Perdomo Calvo; Ana María Jaramillo Pérez; Juan Carlos Mendieta López

2010-01-01

232

ALCHEMIST (Estudios sobre la Secuenciación e Identificación de Marcadores para el Mejoramiento de la Terapia Adjuvante para el Cáncer de Pulmón): Preguntas y respuestas  

Cancer.gov

ALCHEMIST comprende tres estudios clínicos integrados de medicina de precisión diseñados para identificar a personas con cáncer de pulmón en estadio inicial cuyos tumores tienen ciertos cambios genéticos poco comunes. También buscan evaluar si los tratamientos con medicamentos que combaten esos cambios moleculares pueden mejorar la supervivencia

233

SimTJS: A Model for Developing Serious Games for Training SimTJS: Uma Arquitetura para o Desenvolvimento de Jogos Serios para  

E-print Network

Desenvolvimento de Jogos S´erios para Treinamento Daniel Trindade, Peter Dam, Alberto Raposo Tecgraf, Departamento jogos s´erios que imitam cen´arios reais, permitindo que os profissionais realizem operac¸~oes que antes componentes que comp~oem a arquitetura, al´em de exemplos de utilizac¸~ao da mesma. Keywords-Jogos S

Barbosa, Alberto

234

Educação para sustentabilidade : turismo ecopedagógico no Centro de Permacultura Asa Branca e implantação de um espaço permacultural na Escola Classe Jardim Botânico.  

E-print Network

??Dissertação (mestrado)—Universidade de Brasília, Departamento de Engenharia Florestal, 2011. Este trabalho aborda a Permacultura como estratégia para realização da educação para sustentabilidade por meio do… (more)

Jacintho, Thiago Rocha dos Santos

2011-01-01

235

Competing ParA Structures Space Bacterial Plasmids Equally over the Nucleoid.  

PubMed

Low copy number plasmids in bacteria require segregation for stable inheritance through cell division. This is often achieved by a parABC locus, comprising an ATPase ParA, DNA-binding protein ParB and a parC region, encoding ParB-binding sites. These minimal components space plasmids equally over the nucleoid, yet the underlying mechanism is not understood. Here we investigate a model where ParA-ATP can dynamically associate to the nucleoid and is hydrolyzed by plasmid-associated ParB, thereby creating nucleoid-bound, self-organizing ParA concentration gradients. We show mathematically that differences between competing ParA concentrations on either side of a plasmid can specify regular plasmid positioning. Such positioning can be achieved regardless of the exact mechanism of plasmid movement, including plasmid diffusion with ParA-mediated immobilization or directed plasmid motion induced by ParB/parC-stimulated ParA structure disassembly. However, we find experimentally that parABC from Escherichia coli plasmid pB171 increases plasmid mobility, inconsistent with diffusion/immobilization. Instead our observations favor directed plasmid motion. Our model predicts less oscillatory ParA dynamics than previously believed, a prediction we verify experimentally. We also show that ParA localization and plasmid positioning depend on the underlying nucleoid morphology, indicating that the chromosomal architecture constrains ParA structure formation. Our directed motion model unifies previously contradictory models for plasmid segregation and provides a robust mechanistic basis for self-organized plasmid spacing that may be widely applicable. PMID:25521716

Ietswaart, Robert; Szardenings, Florian; Gerdes, Kenn; Howard, Martin

2014-12-01

236

Competing ParA Structures Space Bacterial Plasmids Equally over the Nucleoid  

PubMed Central

Low copy number plasmids in bacteria require segregation for stable inheritance through cell division. This is often achieved by a parABC locus, comprising an ATPase ParA, DNA-binding protein ParB and a parC region, encoding ParB-binding sites. These minimal components space plasmids equally over the nucleoid, yet the underlying mechanism is not understood. Here we investigate a model where ParA-ATP can dynamically associate to the nucleoid and is hydrolyzed by plasmid-associated ParB, thereby creating nucleoid-bound, self-organizing ParA concentration gradients. We show mathematically that differences between competing ParA concentrations on either side of a plasmid can specify regular plasmid positioning. Such positioning can be achieved regardless of the exact mechanism of plasmid movement, including plasmid diffusion with ParA-mediated immobilization or directed plasmid motion induced by ParB/parC-stimulated ParA structure disassembly. However, we find experimentally that parABC from Escherichia coli plasmid pB171 increases plasmid mobility, inconsistent with diffusion/immobilization. Instead our observations favor directed plasmid motion. Our model predicts less oscillatory ParA dynamics than previously believed, a prediction we verify experimentally. We also show that ParA localization and plasmid positioning depend on the underlying nucleoid morphology, indicating that the chromosomal architecture constrains ParA structure formation. Our directed motion model unifies previously contradictory models for plasmid segregation and provides a robust mechanistic basis for self-organized plasmid spacing that may be widely applicable. PMID:25521716

Gerdes, Kenn; Howard, Martin

2014-01-01

237

A Review of the Theories Developed to Describe the Process of College Persistence and Attainment  

Microsoft Academic Search

\\u000a A review of the peer-reviewed papers in the top higher education journals in the last 20 years suggests that the field is\\u000a relying heavily on Tinto’s (1993, Leaving college: Rethinking the causes and cures of student attrition. Chicago: University\\u000a of Chicago Press) theory of student departure. The fact that there is limited empirical support for Tinto’s theory (Braxton,\\u000a Sullivan, &

Tatiana Melguizo

238

Estimation of Carbon Storage in Para Rubber Plantation in Eastern Thailand  

NASA Astrophysics Data System (ADS)

This study aims to estimate the carbon stock and sequestration in Para rubber plantation of East Thailand using the THAICHOTE (Thailand Earth Observation System data). For that purpose we identify the area of every stage class Para rubber plantation by the analysis of different image objects (i.e., rule base and multiple regression classifications) and we map the carbon stock and sequestration of each Para rubber class using biomass allometric regressions and carbon content equations. THAICHOTE data include Multispectral image (4 bands at 15x15 m spatial resolution), Panchromatic image (2x2 m spatial resolution) and Stereo image, data acquisition from December 2011-April 2012. The preliminary investigated area is located in Wangchun, (Eastern, Thailand) and covers about 20 Km2. Calibrating the class stage, by image analysis that integrated edge-based segmentation, reflectance, remote sensing indices, texture analysis and canopy height model (CHM), we found that best classification was obtained by multiple regression (accuracy of 80%) compared to rule base logical operation (accuracy 70%) suggesting that manual 3D stereo measurements or Light Detection And Ranging (LiDAR) both are able to construct the CHM. The results of this study indicate that for a total Para rubber biomass of 14,651 tons, the amount of stored carbon is of 7,326 tons. Mature stage of Para rubber plantations exhibits the highest capacity of sequestering with a global flux of 0.21 tons C/ Km2/year.

Charoenjit, K.; Zuddas, P.; Allemand, P.

2012-12-01

239

Cold neutron production in liquid para- and normal-H 2 moderators  

NASA Astrophysics Data System (ADS)

A neutron transport analysis is performed for liquid H 2 moderators with 100% para and normal (ortho:para=0.75:0.25) fractions. Four sets of energy-averaged cross-sections (group constants) for liquid ortho- and para-H 2 at melting and boiling points are generated and neutron energy range between 0.1 ?eV and 10 eV is broken into 80 groups. Basic moderating characteristics are studied of a model cold-neutron source in a one-dimensional bare-slab geometry. It is shown that liquid para-H 2 is superior in cold neutron production to liquid normal H 2 on account of a para-to-ortho transition (molecular rotational excitation) and a good transmission property with a mean free path of about 10 cm. In the case of neutron extraction from the inside of the source, high intensity of cold neutrons is possible with liquid normal H 2 at higher temperatures up to the boiling point.

Morishima, N.; Matsuo, Y.

2002-09-01

240

ParaPep: a web resource for experimentally validated antiparasitic peptide sequences and their structures  

PubMed Central

ParaPep is a repository of antiparasitic peptides, which provides comprehensive information related to experimentally validated antiparasitic peptide sequences and their structures. The data were collected and compiled from published research papers, patents and from various databases. The current release of ParaPep holds 863 entries among which 519 are unique peptides. In addition to peptides having natural amino acids, ParaPep also consists of peptides having d-amino acids and chemically modified residues. In ParaPep, most of the peptides have been evaluated for growth inhibition of various species of Plasmodium, Leishmania and Trypanosoma. We have provided comprehensive information about these peptides that include peptide sequence, chemical modifications, stereochemistry, antiparasitic activity, origin, nature of peptide, assay types, type of parasite, mode of action and hemolytic activity. Structures of peptides consisting of natural, as well as modified amino acids have been determined using state-of-the-art software, PEPstr. To facilitate users, various user-friendly web tools, for data fetching, analysis and browsing, have been integrated. We hope that ParaPep will be advantageous in designing therapeutic peptides against parasitic diseases. Database URL: http://crdd.osdd.net/raghava/parapep/ PMID:24923818

Mehta, Divya; Anand, Priya; Kumar, Vineet; Joshi, Anshika; Mathur, Deepika; Singh, Sandeep; Tuknait, Abhishek; Chaudhary, Kumardeep; Gautam, Shailendra K.; Gautam, Ankur; Varshney, Grish C.; Raghava, Gajendra P.S.

2014-01-01

241

In Vivo Imaging of ParaCEST Agents Using Frequency Labeled Exchange Transfer (FLEX) MRI  

PubMed Central

Purpose A main obstacle to in vivo applications of paramagnetic chemical exchange saturation transfer (paraCEST) is interference from endogenous tissue magnetization transfer contrast (MTC). The suitability of excitation-based frequency labeled exchange transfer (FLEX) to separate out such MTC effects in vivo was tested. Methods The FLEX sequence measures modulation of the water signal based on the chemical shift evolution of solute proton magnetization as a function of evolution time. Time-domain analysis of this water signal allows identification of different solute components and provides a mechanism to separate out the rapidly decaying MTC components with short T2* values. Results FLEX imaging of paraCEST agents was possible in vitro in phantoms and in vivo in mouse kidneys and bladder. The results demonstrated that FLEX is capable of separating out the MTC signal from tissues in vivo while providing a quantitative exchange rate for the rapidly exchanging paraCEST water protons by fitting the FLEX time-domain signal to FLEX theory. Conclusions The first in vivo FLEX images of a paraCEST agent were acquired, which allowed separation out the tissue MTC components. These results show that FLEX imaging has potential for imaging the distribution of functional paraCEST agents in biological tissues. PMID:23468384

Lin, Chien-Yuan; Yadav, Nirbhay N.; Ratnakar, James; Sherry, A. Dean; van Zijl, Peter C. M.

2013-01-01

242

Irritant contact dermatitis from a black henna tattoo without sensitization to para-phenylendiamine.  

PubMed

Allergic contact dermatitis from nonpermanent black henna tattoos has been frequently reported, particularly in children. Contamination or adulteration of the dyes with para-phenylendiamine has been identified as major cause of active sensitization and elicitation of severe allergic contact dermatitis. Sequelae include permanent sensitization, hyper- or hypopigmentation, scarring, keloids, and hypertrichosis. We report a rare case of irritant dermatitis to an unknown ingredient in a black henna tattoo with consecutive hypopigmentation. Sensitization to para-phenylendiamine and other para-compounds was excluded by patch test evaluation. This is relevant for future exposure to consumer products such as hair dyes or in occupational settings. Generally, black henna tattoos, particularly if done with dyes of unknown composition, should be strongly discouraged. PMID:23690526

Kind, Fabiola; Hofmeier, Kathrin Scherer; Bircher, Andreas J

2013-06-01

243

Para-magneto- and electro-optic microcavities for blue wavelength modulation.  

PubMed

We report on microcavities comprising para-magnetic garnet and electro-optic films (MPMEO) for modulation of the polarization rotation angle of light at near-UV wavelengths with a slight intensity change, with applying a low voltage. The MPMEO are composed of para-magnetic garnet and electro-optic films sandwiched between two Bragg mirrors. The microcavity states in MPMEO are split and yield both the large rotation angle and high optical efficiency. Significant enhancement and modulation by applied voltages are verified through a conventional matrix calculation approach. High optical efficiency (>90%) and large modulation (~90 degree) of the polarization rotation are proved. PMID:24105511

Goto, Taichi; Isogai, Ryosuke; Inoue, M

2013-08-26

244

Rotational Spectroscopy of the CO-para-H2 Molecular Complex  

NASA Astrophysics Data System (ADS)

The rotational spectrum of the CO-para-H2 van der Waals complex, produced using a molecular jet expansion, was observed with two different techniques: OROTRON intracavity millimeter-wave spectroscopy and pulsed Fourier transform microwave spectroscopy. Thirteen transitions in the frequency range from 80 to 130 GHz and two transitions in the 14 GHz region were measured and assigned, allowing for a precise determination of the corresponding energy level positions of CO-para-H2. The data obtained enable further radio astronomical searches for this molecular complex and provide a sensitive test of the currently best available intermolecular potential energy surface for the CO-H2 system.

Potapov, A. V.; Surin, L. A.; Panfilov, V. A.; Dumesh, B. S.; Giesen, T. F.; Schlemmer, S.; Raston, P. L.; Jäger, W.

2009-10-01

245

One methylene too far: The solid state structure of the para-sulfonatomethylcalix[4]arene  

NASA Astrophysics Data System (ADS)

We report here, the first crystallographic structure of the new water soluble calixarene, para-sulfonatomethylcalix[4]arene. Anchoring a methylene group between the aromatic core of the calixarene and sulfonate groups extended the hydrophobic cavity but led to a more flexible macromolecule allowing formation of hydrogen bonds between vicinal sulfonate groups, causing the groups to point towards the cavity and effectively close it, with S ⋯ S distances of 9.7 Å × 7.9 Å. The packing motif consists of bilayers of para-sulfonatomethylcalix[4]arene along both the a and b axis.

Perret, Florent; Guéret, Stéphanie; Suwinska, Kinga; Coleman, Anthony W.

2007-03-01

246

Allergic contact dermatitis of the lip margins from para-tertiary-butylphenol in a lip liner.  

PubMed

We describe the use of gas chromatography with mass spectrometry (GC-MS) in the investigation of a case of allergic contact dermatitis of the lip margins caused by a lip liner. Patch testing identified sensitization to para-tertiary-butylphenol-formaldehyde resin (PTBP-FR), a resin glue frequently used in leather work but rarely found in cosmetics. Investigation specified the para-tertiary-butylphenol (PTBP) component of the resin as the hapten responsible for the allergic contact dermatitis, as well as for associated depigmentation. PMID:8462290

Angelini, E; Marinaro, C; Carrozzo, A M; Bianchi, L; Delogu, A; Giannello, G; Nini, G

1993-03-01

247

LIVROS DIDTICOS E SUAS FUNES PARA O PROFESSOR DE MATEMTICA NO BRASIL E NA FRANA.  

E-print Network

LIVROS DIDÁTICOS E SUAS FUN��ES PARA O PROFESSOR DE MATEMÁTICA NO BRASIL E NA FRAN�A. Clovis Gomes-Claude.Regnier@univ-lyon2.fr RESUMO Esse texto aborda as funções do livro didático de matemática em dois n que visa pôr em evidência o livro didático de matemática como «vetor de formação continuada» para os

Paris-Sud XI, Université de

248

MAT 2351 Calculo para Func~oes de Varias Variaveis I PROVA 2 (peso: 1.2)  

E-print Network

- y + z = 3, determine aquele para o qual a quantidade 2x2 + y2 + 2z2 seja m´inima. BOA PROVA!!! #12 - x + z = 3, determine aquele para o qual a quantidade x2 + 2y2 + 2z2 seja m´inima. BOA PROVA!!! #12 do plano x-y +z = 3, determine aquele para o qual a quantidade x2 + 2y2 + 2z2 seja m´inima. BOA PROVA

Piccione, Paolo

249

Biofumigação com Brassica rapa para o controle de Meloidogyne exigua em diferentes texturas e umidades do solo.  

E-print Network

??Os nematóides formadores de galhas radiculares, pertencentes ao gênero Meloidogyne Goeldi, 1887, constituem um dos grupos de fitonematóides mais importantes para as culturas agrícolas. Meloidogyne… (more)

Roseli dos Reis Goulart

2007-01-01

250

Estratégia de escalonamento de controladores PID baseado em regras Fuzzy para redes industriais foundation fieldbus usando blocos padrões.  

E-print Network

??Com o objetivo de se manter a padronização Foundation Fieldbus, neste trabalho são apresentados procedimentos para se implementar estratégias de controle inteligente, baseadas em escalonamento… (more)

Fábio Soares de Lima

2004-01-01

251

Estrategia de aula para alcanzar aprendizajes significativos y desarrollar habilidades de pensamiento científico en relación con la meiosis.  

E-print Network

??Villada Salazar, Claudia Patricia (2011) Estrategia de aula para alcanzar aprendizajes significativos y desarrollar habilidades de pensamiento científico en relación con la meiosis. Maestría thesis,… (more)

Villada Salazar, Claudia Patricia

2011-01-01

252

Se necesitan 50 000 fumadores y exfumadores para el Estudio Nacional de Exámenes de Pulmón (NLST)  

Cancer.gov

El Instituto Nacional del Cáncer (NCI) lanzó hoy un nuevo estudio para determinar si el examinar a las personas ya sea con una tomografía computarizada espiral o con una radiografía de pecho antes de que tengan síntomas puede reducir las muertes por cáncer de pulmón.

253

Estados Unidos y cuatro países de América Latina se unen para combatir el cáncer  

Cancer.gov

El Instituto Nacional del Cáncer (NCI) de Estados Unidos formalizó esta semana alianzas bilaterales con los gobiernos de Argentina, Brasil, México y Uruguay, para acelerar el avance contra el cáncer en la población hispana de Estados Unidos y de América Latina y mejorar la investigación del cáncer.

254

Significado de los cambios en el cuello uterino: Guía para la salud de la mujer  

Cancer.gov

Explica los pasos que deben seguirse después de un resultado anormal en una prueba de Pap o del VPH, así como las formas de diagnosticar y tratar las afecciones en el cuello uterino. También contiene información sobre las pautas para los exámenes de detección y las vacunas contra el VPH.

255

UN AUTMATA CELULAR PROBABILISTA (ACP) PARA LA SIMULACIN DE AUTOMVILES AUTOMATIZADOS  

E-print Network

UN AUT�MATA CELULAR PROBABILISTA (ACP) PARA LA SIMULACI�N DE AUTOM�VILES AUTOMATIZADOS Antonio delEdos. libresConfiguración inicial #12;#12;El comportamiento promedio ini=0.2 L=1000 ini=0.2 L=400 #12;1 0 10 0

Islas, León

256

ABORDAGEM MULTIOBJETIVO PARA OTIMIZAO DE REDES DE FILAS F. R. B. Cruz  

E-print Network

1 ABORDAGEM MULTIOBJETIVO PARA OTIMIZA��O DE REDES DE FILAS FINITAS F. R. B. Cruz Departamento de uma rede de filas finitas com serviço geral. Como tais objetivos são conflitantes, utiliza-se uma sistemas estocásticos. Palavras-Chaves: Redes de filas; algoritmos genéticos; otimização multiobjetivo

Cruz, Frederico

257

Submetido revista Pesquisa Naval Abordagem Multiobjetivo para Otimizao de Redes de Filas Finitas  

E-print Network

Submetido à revista Pesquisa Naval Abordagem Multiobjetivo para Otimização de Redes de Filas atendimento global de uma rede de filas finitas com serviço geral. Como tais objetivos são conflitantes of these important stochastic systems. Palavras-chave: Redes de filas. Algoritmos genéticos. Otimização multiobjetivo

Cruz, Frederico

258

ACADEMIA DE POLCIA CIVIL CONCURSO PBLICO PARA PROVIMENTO DE VAGAS E FORMAO DE CADASTRO DE RESERVA  

E-print Network

ACADEMIA DE POLÍCIA CIVIL CONCURSO P�BLICO PARA PROVIMENTO DE VAGAS E FORMA��O DE CADASTRO DE ACADEMIA DE POLÍCIA CIVIL DO DISTRITO FEDERAL (APCDF), no uso de suas atribuições legais, torna pública Diretor da Academia de Polícia Civil do Distrito Federal #12;

Maier, Rudolf Richard

259

The Acquisition of Lexical Meaning in a Study Abroad Context: The Spanish Prepositions "por" and "para."  

ERIC Educational Resources Information Center

Examination of the development of form/function relations of the prepositions "por" and "para" at different levels of proficiency in the interlanguage of study-abroad students in Granada, Spain, revealed "noncanonical" as well as "canonical" uses of these prepositions. The most common noncanonical uses were as substitutions for other prepositions…

Lafford, Barbara A.; Ryan, John M.

1995-01-01

260

Michael Faraday e o manuscrito Matter: uma solução metafísica para o problema da ação a distância  

Microsoft Academic Search

O texto aqui traduzido, intitulado simplesmente Matéria, revela um Faraday muito pouco conhecido. É notório que Michael Faraday (1791-1867) fez grandes contribuições para a ciência do eletromagnetismo; dentre elas, duas merecem destaque: a descoberta ex- perimental da indução eletromagnética e a elaboração teórica do conceito de linhas de força, alternativa à explicação (de perspectiva newtoniana) baseada na ação a distân-

Sonia Maria Dion

2006-01-01

261

UN MODELO EFICIENTE PARA LA FINANCIACIÓN PÚBLICA DE LA UNIVERSIDAD ESPAÑOLA  

Microsoft Academic Search

Resumen El presente trabajo realiza una aproximación al uso de los recursos públicos destinados a la financiación de las Instituciones de Educación Superior desde la perspectiva de la eficiencia financiera. Describe una propuesta de modelo para la determinación de las aportaciones públicas a percibir por las Universidades públicas españolas diferenciando dos tramos de financiación: el destinado a cubrir los gastos

LEONOR MORA AGUDO; JOSÉ ÁNGEL RIVERO MENÉNDEZ

2007-01-01

262

Chiral aryl iodide catalysts for the enantioselective synthesis of para-quinols.  

PubMed

Molecular modelling of an iodine(III) phenoxide was used as a starting point in the design of chiral aryl iodide catalysts for stereoselective oxidative dearomatization reactions. Using this approach, catalysts derived from 8-iodotetralone and tartaric acid were constructed and used to synthesize enantioenriched para-quinols from phenols. PMID:23463273

Volp, Kelly A; Harned, Andrew M

2013-04-14

263

Estructuras de comunicación para la resolución de problemas de manera distribuida en la ingeniería concurrente  

Microsoft Academic Search

Se presenta el problema de la comunicación en la resolución de problemas distribuidos. Se analizan las siguientes tecnologías de la comunicación: actores, pizarrones, las comunicaciones homogéneas y heterogéneas en un ambiente de multiagentes. Se ilustra la discusión con ejemplos del ambiente para el Diseño de Objetos Estructurados (Design of Structured Objects - DESO). El prototipo actual integra algunos sistemas preexistentes

Leonid B. Sheremetov

264

Desafíos y cambios, retos impostergables para la educación superior agrícola de la Universidad Rómulo Gallegos  

Microsoft Academic Search

Resumen: La educación superior latinoamericana y particularmente la educación superior agrícola venezolana, reflexionan en torno al para qué, al cómo, con quién y cuándo implementar los cambios que demanda la realidad del sector agrícola, planteados en los enunciados principistas de nuestra carta fundamental y sus leyes, por las demandas y desafíos que en el sector vienen planteando las instancias que

Dany Silvestre; Argenis Cedeño; Pedro Soler; Rafael Pérez; Wilmer Sánchez

265

1/5 CBEB 2008 NOVO MTODO PARA COMPRESSO DE SINAIS DE EMG USANDO  

E-print Network

1/5 CBEB 2008 NOVO MÃ?TODO PARA COMPRESSÃ?O DE SINAIS DE EMG USANDO JPEG2000 M. V. C. Costa*, P. A for compression of electromyographic (EMG) signals based on the JPEG2000 coding system. Originally designed for compression of still images, we show that JPEG2000 codec can also be used to compress EMG signals for both

Carvalho, João Luiz

266

Indicadores internacionales de Soberanía Alimentaria. Nuevas herramientas para una nueva agricultura  

Microsoft Academic Search

La crisis alimentaria del año 2008 situó en la agenda política, una vez más, uno de los retos globales más importantes que la humanidad debe afrontar: satisfacer el derecho a la alimentación de una manera sostenible. La Soberanía Alimentaria es un concepto, propuesto y desarrollado por numerosas organizaciones campesinas, que puede contribuir al objetivo planteado. No obstante para aumentar el

Miquel Ortega-Cerdà; Marta G. Rivera-Ferre

2010-01-01

267

Evaluación de los modelos de pronóstico aplicados para la demanda turística internacional hacia Colombia  

Microsoft Academic Search

En la actualidad, existen factores de orden financiero, cultural, social y medioambiental susceptibles de ser utilizados para explicar los flujos turísticos internacionales desde y hacia un país. (Coshall, 2000: 218). No obstante, se analizan algunos factores económicos que pueden afectar los viajes o estancias de las personas. A partir de 1970 hasta 1977, el sector turístico colombiano dependía en un

Dennys MarrugoTorrente

2009-01-01

268

TURISMO IDIOMÁTICO EN EL MEDIO RURAL: UNA PROPUESTA PARA SU DESARROLLO Y COMERCIALIZACIÓN  

Microsoft Academic Search

Miles de personas se desplazan a España cada año para sumergirse en su lengua y su cultura. Puesto que esta actividad utiliza los servicios propios del turismo tradicional es considerada un tipo de turismo denominado turismo de idiomas o turismo idiomático. En España existen destinos especializados fuertemente consolidados, frecuentemente urbanos y relacionados con universidades y zonas costeras. Los cambios en

Ana María Campón Cerro; José Manuel Hernández Mogollón

2011-01-01

269

Directrices básicas para la auditoría de sistemas de gestión de calidad en instituciones de educación superior  

Microsoft Academic Search

En las páginas siguientes, se presenta un marco de directrices básicas para la auditoría de sistemas de gestión de calidad a las instituciones de educación superior, en especial de sus programas de postgrado. En este trabajo se indaga, básicamente sobre, la conceptualización de la auditoría de sistemas y la particularización de las categorías de auditoría, además se aborda los principios

Manuel Vélez C; Paulo Vélez León

2008-01-01

270

PROCEDIMIENTO PARA LA ACREDITACIN DEL REQUISITO LINGSTICO EN LA UNIVERSIDAD DE INTRODUCCIN  

E-print Network

participar en Programas de Movilidad. 2. PROCEDIMIENTO DE ACREDITACI�N La normativa propia Instrucciones para solicitado traslado de expediente o la inscripción en un programa de movilidad. 2. Reconocimiento de haber, haber solicitado traslado de expediente o la inscripción en un programa de movilidad. Cuando se precise

Escolano, Francisco

271

SELECCIN DE ACACIAS PARA LA CONSTRUCCIN DE NIDOS DE AVES: UN BENEFICIO INDIRECTO DEL MUTULISMO  

E-print Network

SELECCI�N DE ACACIAS PARA LA CONSTRUCCI�N DE NIDOS DE AVES: UN BENEFICIO INDIRECTO DEL MUTULISMO caducifolio centroamericano, y comúnmente construyen sus nidos en acacias, principalmente en Acacia collinsii alimenta de las secreciones de los nectarios y los cuerpos de Belt de la de la acacia. Por su parte, la

Cuervo, Andrés

272

REDES TRANSACIONALES: APORTES PARA LA LECTURA SOBRE EL CASO AMERICANO DE LA ALIANZA SOCIAL CONTINENTAL  

E-print Network

REDES TRANSACIONALES: APORTES PARA LA LECTURA SOBRE EL CASO AMERICANO DE LA ALIANZA SOCIAL, específicamente en América Latina y el Caribe. Palabras Clave: Redes transnacionales - Movimientos sociales plural: la Alianza Social Continental (ASC). En el marco del regionalismo de segunda generación, el

Paris-Sud XI, Université de

273

REDES-Revista hispana para el anlisis de redes sociales Vol.6,#7, Junio 2009  

E-print Network

REDES- Revista hispana para el análisis de redes sociales Vol.6,#7, Junio 2009 http://revista-redes propone devolverle a la relación social su importancia como unidad básica de las redes sociales, y explorar lo que constituye su "sustancia" considerada aquí como el "motivo" de las relaciones. Las redes

Boyer, Edmond

274

REVISION DE MARCOS TEORICOS EDUCATIVOS PARA EL DISEÑO Y USO DE PROGRAMAS DIDÁCTICOS  

Microsoft Academic Search

RESUMEN Se desea presentar la aparición del software educativo y su evolución a la luz de algunas de las teorías educati- vas más representativas. En este paralelismo, sólo se mencionan aquellas teorías y\\/o autores que darán los marcos con- ceptuales para los desarrollos de los programas didácticos en función de las aplicaciones deseadas. Partiendo del con- ductismo skinneriano1, se pasa

Z. Cataldi; F. Lage; R. Pessacq; García Martínez

275

Effect of the site of infusion of para-aminohippuric acid (PAH) on portal blood flow  

E-print Network

Effect of the site of infusion of para-aminohippuric acid (PAH) on portal blood flow LM Zeoula C-308) suggested that mixing of PAH in portal blood could be improved by infusing PAH simultaneously via a ruminal of the PAH infusion site in different animals such that the infusion site effect may have been biased

Paris-Sud XI, Université de

276

INSTRUCCIONES DE ACTUACIN PARA LOS MIEMBROS DE LA DEFENSORA DE LOS DERECHOS UNIVERSITARIOS,  

E-print Network

INSTRUCCIONES DE ACTUACI�N PARA LOS MIEMBROS DE LA DEFENSORÍA DE LOS DERECHOS UNIVERSITARIOS, RELATIVAS A LA PRESERVACI�N Y OBSERVANCIA DE LOS DERECHOS Y OBLIGACIONES DE LOS UNIVERSITARIOS EN EL los Derechos Universitarios después de analizar dichos LINEAMIENTOS aprecia que los mismos son acordes

Arroyo Rodríguez, Víctor

277

Energia Renovable para Centros de Salud Rurales (Renewable Energy for Rural Health Clinics)  

SciTech Connect

Esta es la primera de una serie de guias de aplicaciones que el Programa de Energia de Villas de NREL esta comisionando para acoplar sistemas comerciales renovables con aplicaciones rurales, incluyendo agua, escuelas rurales y micro empresas. La guia esta complementada por las actividades de desarrollo del Programa de Energia de Villas de NREL, proyectos pilotos internacionales y programas de visitas profesionales.

Jimenez, T.; Olson, K.

1999-07-28

278

Physiological Relevance of Successive Hydroxylations of Toluene by Toluene para-Monooxygenase of Ralstonia pickettii  

E-print Network

-Monooxygenase of Ralstonia pickettii PKO1 AYELET FISHMAN, YING TAO and THOMAS K. WOOD* Departments of Chemical Engineering (TpMO) of Ralstonia pickettii PKO1 (encoded by tbuA1UBVA2C) performs successive hydroxylations para-monooxygenase (TpMO) of Ralstonia pickettii PKO1, formerly known as toluene 3-mono- oxygenase (T3

Wood, Thomas K.

279

Antimicrobial effect of para-alkoxyphenylcarbamic acid esters containing substituted N-phenylpiperazine moiety  

PubMed Central

In current research, nine basic esters of para-alkoxyphenylcarbamic acid with incorporated 4-(4-fluoro-/3-trifluoromethylphenyl)piperazin-1-yl fragment, 6i–6m and 8f–8i, were screened for their in vitro antimicrobial activity against Candida albicans, Staphylococcus aureus and Escherichia coli, respectively. Taking into account the minimum inhibitory concentration assay (MIC), as the most active against given yeast was evaluated 8i (MIC = 0.20 mg/mL), the most lipophilic structure containing para-butoxy and trifluoromethyl substituents. Investigating the efficiency of the compounds bearing only a single atom of fluorine and appropriate para-alkoxy side chain against Candida albicans, the cut-off effect was observed. From evaluated homological series, the maximum of the effectiveness was noticed for the stucture 6 k (MIC = 0.39 mg/mL), containing para-propoxy group attached to phenylcarbamoyloxy fragment, beyond which the compounds ceased to be active. On the contrary, all the tested molecules were against Staphylococcus aureus and Escherichia coli (MICs > 1.00 mg/mL) practically inactive. PMID:24294237

Malík, Ivan; Bukovský, Marián; Andriamainty, Fils; Gališinová, Jana

2013-01-01

280

REDE ISOBUS PARA CONTROLE E COMUNICAÇÃO DE DADOS DE UM ROBÔ AGRÍCOLA MÓVEL  

Microsoft Academic Search

RESUMO: Diante da grande necessidade de se projetar máquinas e implementos agrícolas cada vez mais automatizadas, uma forte tendência atual é o desenvolvimento de robôs móveis e veículos autônomos para área agrícola. Estes robôs e veículos, implementados com as mesmas tecnologias existentes em máquinas agrícolas, desempenham tarefas específicas com grande eficiência, originado ganhos de operação quando comparados a utilização de

EDUARDO PACIÊNCIA GODOY; GIOVANA TRIPOLONI TANGERINO; RAFAEL VIEIRA DE SOUSA; ARTHUR JOSÉ VIEIRA PORTO; RICARDO YASSUSHI INAMASU

281

Neuronas espejo, Teoría de la Mente y Corrupción. Neuropsicología para prevenir la corrupción  

Microsoft Academic Search

Este artículo es una propuesta para analizar ciertas conductas criminales usando las neuronas espejo y la Teoría de la Mente (ToM). El artículo muestra el rendimiento teórico y práctico de estos conceptos aplicados al análisis y prevención de la corrupción. Las neuronas espejo son áreas neuronales que se activan cuando se percibe que una persona sufre. Estas áreas permiten simular,

Eduardo Salcedo-Albarán; María-Margarita Zuleta; Mauricio Rubio; Isaac de León-Beltrán

2006-01-01

282

188 Oliveira et al. Quim. Nova SISTEMA DE INJEO EM FLUXO ESPECTROFOTOMTRICO PARA MONITORAR PERXIDO DE  

E-print Network

188 Oliveira et al. Quim. Nova SISTEMA DE INJE��O EM FLUXO ESPECTROFOTOM�TRICO PARA MONITORAR injection analysis; foto-Fenton. ArtigoQuim. Nova, Vol. 24, No. 2, 188-190, 2001. INTRODU��O A reação foto

Jardim, Wilson de Figueiredo

283

‘Madrinas’: snitching\\/para?policing and the illegal support of police work in Mexico  

Microsoft Academic Search

This paper analyzes the institutional role of informal para?police groups in Mexico known as ‘madrinas.’ The specific characteristics of ‘madrinas’ are that they are run as complex?structured networks with hierarchies, they actively participate in police activities, and they are an alternative way of gaining entry into the police institution. However, their key function is intelligence work within the police agency

Gustavo Fondevila

2011-01-01

284

USO DE AGENTES COMPUTACIONAIS NO DESENVOLVIMENTO DE FERRAMENTAS PARA GERENCIAMENTO DE CURSOS EM EDUCAÇÃO A DISTÂNCIA  

Microsoft Academic Search

Este trabalho apresenta a descrição do projeto de um conjunto de ferramentas que se aplica às tarefas de gerenciamento de materiais didáticos apresentados no ambiente WWW. A proposta deste trabalho está centrada no desenvolvimento de mecanismos para a interação entre as entidades aluno e professor com o curso disponibilizado através do ambiente WWW, utilizando-se da tecnologia de agentes de software.

ELAINE QUINTINO DA SILVA; JOÃO BENEDITO DOS SANTOS; HARRISSON FERREIRA GOMES; GEHARDT DA SILVA; HUDSON DE PÁDUA MELO; JAMERSON JARDEL NERE; LEANDRO ALVARENGA ANDRADE; RAMON BORGES LOPES

1999-01-01

285

Parallel algorithms for the DNA Fragment Assembly Problem Team ParaCore  

E-print Network

the complete DNA sequence of a living organism. Image from www.bristol.k12.ct.us #12;II. Shotgun sequencingParallel algorithms for the DNA Fragment Assembly Problem Team ParaCore ·Artur, Braga ·Igor Pelvain Science ­ Rochester Institute of Technology #12;Outline I. Overview: DNA as the support of genetic

Kaminsky, Alan

286

Revisado en Junio 2013 Recomendaciones para el Manejo de SWD en los Arndanos de Michigan  

E-print Network

Revisado en Junio 2013 Recomendaciones para el Manejo de SWD en los Arándanos de Michigan practices. USDAOAO Grant number 59250112019. La Drosófila de alas manchadas (SWD) es una plaga invasora de Unidos. En Michigan, la primera SWD fue encontrada después de la cosecha de arándanos en el 2010. En 2011

287

Diagrama Ti - V: una nueva propuesta de discriminación para magmas básicos en cinco ambientes tectónicos  

Microsoft Academic Search

RESUMEN Se presentan diagramas de discriminació n para magmas básicos (basaltos normativos en hiperstena, basaltos normativos en nefelina, y traquiandesita s basálticas normativas en nefelina), que tienen por objeto el distinguir entre cinco diferentes ambientes tectónicos: arco continental (AC); arco de isla (AI); rift (Rt); isla oceánica (IO) y basaltos de cresta mesoceánica (MOR); con base en los datos de

Manuel Vasconcelos-F; Surendra P. Verma; R. Carmen Vargas-B

288

Considerações sobre técnicas para a implementação de skeletal animation em Jogos 3D  

Microsoft Academic Search

Neste artigo examinamos uma tecnologia de animação conhecida como skeletal animation baseada na junção hierárquica das partes que formam o modelo a ser animado. Esta tecnologia pode ser aplicada a diversos domínios onde a animação de modelos é necessária, como a análise e simulação física de estruturas hierárquicas simples e animações artísticas de modelos e entretenimento (jogos de computador). Para

Márcio da Silva Camilo; Bernardo Nogueira; Soares Hodge; Rodrigo Pereira Martins; Alexandre Sztajnberg

289

Tempo de Converg^encia para o Equilibrio de Nash nos Jogos Empacotamento de Itens e  

E-print Network

Tempo de Converg^encia para o Equil´ibrio de Nash nos Jogos Empacotamento de Itens e Balanceamento Empacotamento Ego´ista Simult^aneo Balanceamento de Carga Ass´incrono Conc Quest~oes Interessantes: · O jogo

Vignatti, André L.

290

Aplicacin del Ensayo Trmico mediante sensores de temperatura de fibra ptica (DTS) para el  

E-print Network

Aplicación del Ensayo Térmico mediante sensores de temperatura de fibra óptica (DTS) para el ­ Analogía con ensayo hidráulico Visual Transin #12;Instrumentación: Analogía con ensayo hidráulico DTS

Politècnica de Catalunya, Universitat

291

Linguateca: um Centro de Recursos Distribuído para o Processamento Computacional da Língua Portuguesa  

Microsoft Academic Search

Resumo. Neste artigo apresentamos uma panorâmica da actividade da Linguateca na criação e disponibilização de recursos e ferramentas para a língua portuguesa. Começamos por uma descrição dos objectivos e pressupostos da Linguateca e uma breve história da sua intervenção, e finalizamos com algumas considerações sobre a melhor forma de prosseguir na organização da área.

Diana Santos; Alberto Simões; Anabela Barreiro; Belinda Maia; Cristina Mota; Débora Oliveira; Eckhard Bick; Elisabete Ranchhod; José João Dias de Almeida; Luís Cabral; Luís Costa; Luís Sarmento; Marcirio Chaves; Nuno Cardoso; Paulo Rocha; Rachel Aires; Rosário Silva; Rui Vilela; Susana Afonso

2004-01-01

292

Intact cluster and chordate-like expression of ParaHox genes in a sea star  

PubMed Central

Background The ParaHox genes are thought to be major players in patterning the gut of several bilaterian taxa. Though this is a fundamental role that these transcription factors play, their activities are not limited to the endoderm and extend to both ectodermal and mesodermal tissues. Three genes compose the ParaHox group: Gsx, Xlox and Cdx. In some taxa (mostly chordates but to some degree also in protostomes) the three genes are arranged into a genomic cluster, in a similar fashion to what has been shown for the better-known Hox genes. Sea urchins possess the full complement of ParaHox genes but they are all dispersed throughout the genome, an arrangement that, perhaps, represented the primitive condition for all echinoderms. In order to understand the evolutionary history of this group of genes we cloned and characterized all ParaHox genes, studied their expression patterns and identified their genomic loci in a member of an earlier branching group of echinoderms, the asteroid Patiria miniata. Results We identified the three ParaHox orthologs in the genome of P. miniata. While one of them, PmGsx is provided as maternal message, with no zygotic activation afterwards, the other two, PmLox and PmCdx are expressed during embryogenesis, within restricted domains of both endoderm and ectoderm. Screening of a Patiria bacterial artificial chromosome (BAC) library led to the identification of a clone containing the three genes. The transcriptional directions of PmGsx and PmLox are opposed to that of the PmCdx gene within the cluster. Conclusions The identification of P. miniata ParaHox genes has revealed the fact that these genes are clustered in the genome, in contrast to what has been reported for echinoids. Since the presence of an intact cluster, or at least a partial cluster, has been reported in chordates and polychaetes respectively, it becomes clear that within echinoderms, sea urchins have modified the original bilaterian arrangement. Moreover, the sea star ParaHox domains of expression show chordate-like features not found in the sea urchin, confirming that the dynamics of gene expression for the respective genes and their putative regulatory interactions have clearly changed over evolutionary time within the echinoid lineage. PMID:23803323

2013-01-01

293

Action mechanism of tyrosinase on meta- and para-hydroxylated monophenols.  

PubMed

The relationship between the structure and activity of meta- and para-hydroxylated monophenols was studied during their tyrosinase-catalysed hydroxylation and the rate-limiting steps of the reaction mechanism were identified. The para-hydroxylated substrates permit us to study the effect of a substituent (R) in the carbon-1 position (C-1) of the benzene ring on the nucleophilic attack step, while the meta group permits a similar study of the effect on the electrophilic attack step. Substrates with a -OCH3 group on C-1, as p-hydroxyanisol (4HA) and m-hydroxyanisol (3HA), or with a -CH2OH group, as p-hydroxybenzylalcohol (4HBA) and m-hydroxybenzylalcohol (3HBA), were used because the effect of the substituent (R) size was assumed to be similar. However, the electron-donating effect of the -OCH3 group means that the carbon-4 position (C-4) is favoured for nucleophilic attack (para-hydroxylated substrates) or for electrophilic attack (meta-hydroxylated substrates). The electron-attracting effect of the -CH2OH group has the opposite effect, hindering nucleophilic (para) or electrophilic (meta) attack of C-4. The experimental data point to differences between the maximum steady-state rate (V(M)Max) of the different substrates, the value of this parameter depends on the nucleophilic and electrophilic attack. However, differences are greatest in the Michaelis constants (K(M)m), with the meta-hydroxylated substrates having very large values. The catalytic efficiency k(M)cat/K(M)m is much greater for thepara-hydroxylated substrates although it varies greatly between one substrate and the other. However, it varies much less in the meta-hydroxylated substrates since this parameter describes the power of the nucleophilic attack, which is weaker in the meta OH. The large increase in the K(M)m of the meta-hydroxylated substrates might suggest that the phenolic OH takes part in substrate binding. Since this is a weaker nucleophil than the para-hydroxylated substrates, the binding constant decreases, leading to an increase in K(M)m. The catalytic efficiency of tyrosinase on a monophenol (para or meta) is directly related to the nucleophilic power of the oxygen of the phenolic OH. The oxidation step is not limiting since if this were the case, the para and meta substrates would have the same V(M)max. The small difference between the absolute values of V(M)max suggests that the rate constants of the nucleophilic and electrophilic attacks are on the same order of magnitude. PMID:10839460

Fenoll, L G; Rodríguez-López, J N; Varón, R; García-Ruiz, P A; García-Cánovas, F; Tudela, J

2000-04-01

294

Ancient origins of axial patterning genes: Hox genes and ParaHox genes in the Cnidaria.  

PubMed

Among the bilaterally symmetrical, triploblastic animals (the Bilateria), a conserved set of developmental regulatory genes are known to function in patterning the anterior-posterior (AP) axis. This set includes the well-studied Hox cluster genes, and the recently described genes of the ParaHox cluster, which is believed to be the evolutionary sister of the Hox cluster (Brooke et al. 1998). The conserved role of these axial patterning genes in animals as diverse as frogs and flies is believed to reflect an underlying homology (i.e., all bilaterians derive from a common ancestor which possessed an AP axis and the developmental mechanisms responsible for patterning the axis). However, the origin and early evolution of Hox genes and ParaHox genes remain obscure. Repeated attempts have been made to reconstruct the early evolution of Hox genes by analyzing data from the triphoblastic animals, the Bilateria (Schubert et al. 1993; Zhang and Nei 1996). A more precise dating of Hox origins has been elusive due to a lack of sufficient information from outgroup taxa such as the phylum Cnidaria (corals, hydras, jellyfishes, and sea anemones). In combination with outgroup taxa, another potential source of information about Hox origins is outgroup genes (e.g., the genes of the ParaHox cluster). In this article, we present cDNA sequences of two Hox-like genes (anthox2 and anthox6) from the sea anemone, Nematostella vectensis. Phylogenetic analysis indicates that anthox2 (= Cnox2) is homologous to the GSX class of ParaHox genes, and anthox6 is homologous to the anterior class of Hox genes. Therefore, the origin of Hox genes and ParaHox genes occurred prior to the evolutionary split between the Cnidaria and the Bilateria and predated the evolution of the anterior-posterior axis of bilaterian animals. Our analysis also suggests that the central Hox class was invented in the bilaterian lineage, subsequent to their split from the Cnidaria. PMID:11324016

Finnerty, J R; Martindale, M Q

1999-01-01

295

Comienza la construcción de instalación patrocinada por el NCI en Puerto Rico para realizar estudios clínicos sobre el cáncer  

Cancer.gov

El gobierno de Puerto Rico ha destinado $196 millones de dólares para construir un hospital oncológico de 287 000 pies cuadrados en San Juan, que contará con 96 camas. El nuevo hospital es el primero en su clase en la región caribeña y en él se llevarán a cabo tratamientos para el cáncer y estudios clínicos.

296

EVALUATION OF PARA-DICHLOROBENZENE EMISSIONS FROM SOLID MOTH REPELLANT AS A SOURCE OF INDOOR AIR POLLUTION  

EPA Science Inventory

The paper reports results of dynamic and static chamber tests to evaluate para-dichlorobenzene emission rates from mothcakes. he data were analyzed by a model that assumes that the para-dichlorobenzene emission from mothcakes is a temperature-sensitive sublimation process. ull-sc...

297

EVALUATION OF PARA-DICHLOROBENZENE EMISSIONS FROM SOLID MOTH REPELLANT AS A SOURCE OF INDOOR AIR POLLUTION  

EPA Science Inventory

Mothcakes made of para-dichlorobenzene have been widely available for the general population to be used as a moth repellant to protect garments from insect damage. Usually, a mothcake is expected to last for weeks or even months during which the para-dichlorobenzene emits slowly ...

298

BUSCA LOCAL PARA POS-PROCESSAMENTO EM RESULTADOS DE OTIMIZAC~AO MULTI-OBJETIVO EM REDES DE FILAS  

E-print Network

BUSCA LOCAL PARA P´OS-PROCESSAMENTO EM RESULTADOS DE OTIMIZA¸C~AO MULTI-OBJETIVO EM REDES DE FILAS otimiza¸c~ao de redes de filas finitas, a capacidade total do sistema em ´areas de espera deve ser a menor algoritmo simulated annealing foi desenvolvido, especialmente para redes de filas finitas, produzindo solu

Cruz, Frederico

299

Para-social work to address most vulnerable children in sub-Sahara Africa: A case example in Tanzania  

Microsoft Academic Search

Addressing the needs of the most vulnerable children is a universal challenge, particularly in developing countries lacking infrastructure of social welfare services, adequately trained workforce and educational programs. This article describes training and utilization of para-social workers to the social service needs of children and families. These supervised para-professional community based staff and volunteers can fill gaps in serving the

Nathan Linsk; Zena Mabeyo; Leah Omari; Donna Petras; Bonnie Lubin; Abebe Assefa Abate; Lucy Steinitz; Theresa Kaijage; Sally Mason

2010-01-01

300

Bacillus subtilis Soj (ParA): The involvement of DNA binding and dynamic localization in plasmid partitioning  

E-print Network

The ParA family of ATPases encompasses proteins with a wide variety of functions. The prototype of this family is the ParA ATPase from the P1 prophage plasmid, which, along with ParB and the parS binding site, is required for the faithful...

Hester, Christina Marie

2008-05-08

301

DISEÑO DE UNA ESTRATEGIA PROMOCIONAL PARA UN NUEVO SEGMENTO DE MERCADO: PROGRAMA MBA-FULL TIME, EGADE-MONTERREY  

Microsoft Academic Search

En el presente trabajo se muestra la problemática que enfrenta la Escuela de Graduados en Administración y Dirección de Empresas (EGADE) del Tecnológico de Monterrey, Campus Monterrey, en cuanto a la captación de matrícula para su programa de MBA-Full Time, que es el pilar fundamental de esta importante escuela de negocios; para ello se identificó un importante segmento de mercado

Héctor Cuevas Vargas; Rudy Fernández Escobedo; Leticia Almanza Serrano

2010-01-01

302

ERASMUS -Movilidad de Personal para Formacin (STT) El objetivo de este programa es que el PAS de una universidad pueda  

E-print Network

PAS ERASMUS - Movilidad de Personal para Formación (STT) El objetivo de este programa es que el PAS publicación de la resolución de concesión. 2. Convenio de subvención de movilidad . (Por duplicado) 3. Acuerdo de movilidad firmado por ambas instituciones. La persona responsable para la firma del Plan de

Escolano, Francisco

303

Convocatoria LLP-Erasmus 2012-13 Convocatoria de movilidad para la formacin del personal de administracin y  

E-print Network

Convocatoria LLP-Erasmus 2012-13 Convocatoria de movilidad para la formación del personal de promoción de la movilidad de estudiantes, de profesorado y de personal de administración y servicios. La una convocatoria de 20 ayudas para fomentar la movilidad con fines de formación del Personal de

Escolano, Francisco

304

ERASMUS STAFF INTERNATIONAL WEEKS 13-14 A modo divulgativo anunciamos diferentes International Weeks para solicitar una movilidad  

E-print Network

Weeks para solicitar una movilidad Erasmus PDI + PAS para impartir docencia o recibir formación solicitud: 15 de marzo de 2014 Información Contacto: staff.week@uni-kassel.de FRANCIA (MOVILIDAD PROFESORES.study-in-champagne.com ALEMANIA (MOVILIDAD PROFESORES) Westfälische Hochschule Del 5 al 8 de Mayo de 2014 Invitación Programa

Rey Juan Carlos, Universidad

305

Zoneamento agrícola e época de semeadura para trigo no Brasil Agricultural zoning and sowing dates for wheat in Brazil  

Microsoft Academic Search

Resumo - Um Programa de Zoneamento Agrícola para o Brasil, subsidiando a política de crédito e securidade rural, começou a ser posto em prática pelo Ministério da Agricultura, Pecuária e Abastecimento (MAPA) a partir da safra de inverno de 1996, com a cultura de trigo no sul do Brasil. Este artigo apresenta uma síntese dos trabalhos sobre zoneamento agrícola para

Gilberto Rocca da Cunha; João Carlos Haas; Jaime Ricardo; Tavares Maluf; Paulo Henrique Caramori; Eduardo Delgado Assad; Hugo José Braga; Jurandir Zullo Jr; Cláudio Lazzarotto; Sérgio Gonçalves; Marcos Wrege; Dionísio Brunetta; Sérgio Roberto Dotto; Hilton Silveira Pinto; Orivaldo Brunini; Vera Magali; Radtke Thomé; Sérgio Luiz Zampieri; Aldemir Pasinato; Márcia Barrocas Moreira Pimentel; Cristina Pandolfo

2001-01-01

306

Saturn’s Tropospheric Temperatures and Para-Hydrogen Distribution from Ten Years of Cassini Observations  

NASA Astrophysics Data System (ADS)

Cassini/CIRS observations of Saturn’s 10-1400 cm-1 spectrum have been inverted to construct a global record of tropospheric temperature and para-hydrogen variability over the ten-year span of the Cassini mission. The data record the slow reversal of seasonal asymmetries in tropospheric conditions from northern winter (2004, Ls=293), through northern spring equinox (2009, Ls=0) to the present day (2014, Ls=60). Mid-latitude tropospheric temperatures have cooled by approximately 4-6 K in the south and warmed by 2-4 K in the north, with the seasonal contrast decreasing with depth. CIRS detected the north polar minimum 100-mbar temperatures 6-8 years after winter solstice, whereas the south polar maximum occurred 1-2 years after summer solstice, consistent with the lag times predicted by radiative equilibrium models. Warm polar cyclones and the northern hexagon persist throughout the mission, suggesting that they are permanent features of Saturn’s tropospheric circulation. The 200-mbar thermal enhancement (“knee”) that was strongest in the summer but weak or absent in winter in 2004-2006 (Fletcher et al., 2007, Icarus 189, p.457-478) has now shifted northward and is present globally in 2014, suggestive of radiative heating in Saturn’s tropospheric haze layer. Saturn’s para-H2 fraction, which serves as a tracer of both tropospheric mixing and the efficiency of re-equilibration between the ortho- and para-hydrogen states, is slowly altering: super-equilibrium conditions (para-H2 fraction exceeding equilibrium expectations and suggestive of subsiding airmasses) that dominated the southern summer hemisphere are now weakening, whereas the sub-equilibrium conditions (suggestive of uplift) of the northern winter are being replaced by equilibrium or super-equilibrium conditions in spring. The thermal ‘knee’ and the para-H2 distribution are tracking both the increased spring illumination and the increasing tropospheric haze opacity of the springtime hemisphere observed via colour changes in visible light, suggesting a close connection between the tropospheric temperatures, para-H2 and haze characteristics.

Fletcher, Leigh N.; Irwin, Patrick G.; Sinclair, James; Giles, Rohini; Barstow, Joanna; Achterberg, Richard K.; Orton, Glenn S.

2014-11-01

307

H2CS abundances and ortho-to-para ratios in interstellar clouds  

NASA Technical Reports Server (NTRS)

Several H2CS ortho and para transitions have been observed toward interstellar molecular clouds, including cold, dark clouds and star-forming regions. H2CS fractional abundances f(H2CS) about 1-2 10 to the -9th relative to molecular hydrogen toward TMC-1, Orion A, and NGC 7538, and about 5 10 to the -10th for L134N are derived. The H2CS ortho-to-para ratios in TMC-1 are about 1.8 toward the cyanopolyyne peak and the ammonia peak, which may indicate the thermalization of H2CS on 10 K grains. A ratio of about 3, the statistical value, for Orion (3N, 1E) and NGC 7538 is derived, while a value of about 2 for Orion (KL) is found.

Minh, Y. C.; Irvine, W. M.; Brewer, M. K.

1991-01-01

308

EL PROGRAMA CITI: UNA ALTERNATIVA PARA LA CAPACITACIÓN EN ÉTICA DE LA INVESTIGACIÓN EN AMÉRICA LATINA  

PubMed Central

El Programa CITI (Collaborative Institutional Training Initiative) es un curso basado en Internet y desarrollado por voluntarios, que brinda material educacional sobre protección de sujetos humanos en investigaciones biomédicas y de conducta, buenas prácticas clínicas, conducta responsable de la investigación y trato humanitario a animales de laboratorio. Es un esfuerzo conjunto del Fred Hutchinson Cancer Research Center y la Universidad de Miami. Con la colaboración de expertos locales, gran parte del contenido se ha adaptado para América Latina, se ha traducido al español y portugués y se han establecido acuerdos de colaboración con instituciones especializadas en bioética en Chile, Brasil, Costa Rica y Perú. Los autores presentan una metodología accesible para la capacitación en ética de la investigación y una justificación de su uso y difusión en América Latina PMID:21687817

Litewka, Sergio; Goodman, Kenneth; Braunschweiger, y Paul

2011-01-01

309

Modelizacion, control e implementacion de un procesador energetico paralelo para aplicacion en sistemas multisalida  

NASA Astrophysics Data System (ADS)

Cualquier sistema electronico que incluya un procesado o tratamiento de la senal, y ademas, algun tipo de actuador mecanico generalmente necesita, como minimo, dos tensiones diferentes de alimentacion. Excluyendo los sistemas de alimentacion distribuida, la solucion tecnica mas utilizada para proporcionar dos o mas tensiones consiste en las fuentes de alimentacion multisalida. En una fuente de alimentacion multisalida los diferentes circuitos que conforman cada salida comparten un mismo transformador de potencia optimizando coste, masa, y volumen. Las ventajas obtenidas con este procedimiento tienen en su contra el efecto que sobre cada salida individual provocan las demas en su conjunto debido, principalmente, a los efectos de los elementos parasitos de los componentes. Un cambio de carga en una de las salidas produce un transitorio que es visto por todas las demas como un efecto de impedancia cruzada, y al final del transitorio, la tension de cada salida es diferente respecto a la que tenian antes del transitorio. Este ultimo resultado se conoce como regulacion cruzada. La disminucion de los efectos de la regulacion cruzada ha sido objeto de estudio durante los ultimos anos. El objetivo ha sido el desarrollo de distintas estrategias que permiten, desde disminuir los efectos de la regulacion cruzada hasta los niveles deseables, a eliminarla completamente. El resultado final suele suponer una penalizacion sobre el diseno del sistema directamente proporcional al grado de regulacion a conseguir en las distintas salidas. Entre las soluciones propuestas para eliminar la regulacion cruzada las tecnicas de post-regulacion se han consolidado como la opcion mas aceptada ya que, pueden aplicarse a cualquier convertidor y no suponen ninguna complejidad adicional a la hora de plantear el diseno. En esta Tesis Doctoral se abordara el estudio de la tecnica conocida como postregulacion mediante transformador controlado, que si bien se ha empleado en convertidores resonantes, su modelizacion, y aplicacion en convertidores PWM, esta aun por estudiar y valorar. El primer Capitulo consiste en una breve introduccion al problema de la regulacion cruzada y la impedancia cruzada para posteriormente describir las tecnicas de post-regulacion actualmente mas empleadas, con especial atencion al post-regulador con transformador controlado. El Capitulo segundo trata del estudio de las caracteristicas estaticas del postregulador con transformador controlado. Partiendo de los estudios disponibles sobre el postregulador se plantean mejoras en su modo de actuacion y se discuten tres alternativas diferentes para controlar el transformador. Las dos primeras consisten en emplear un convertidor auxiliar Boost en sus dos modos de funcionamiento, continuo y discontinuo. La tercera consiste en controlar el transformador con una tension PWM directamente, sin filtrado. Finalmente se comprueba experimentalmente, para el estado estacionario, el funcionamiento del post-regulador para cada uno de los tres metodos de control. El Capitulo tercero trata de la dinamica de la salida controlada con el post-regulador cuando este emplea un convertidor auxiliar tipo Boost. Mediante la tecnica de promediado de variables de estado se propone el modelo de pequena senal, tanto para el modo continuo como para el modo discontinuo de funcionamiento del convertidor auxiliar. Los resultados mas significativos de esta seccion son las expresiones analiticas de las impedancias cruzadas y de la impedancia de la salida post-regulada. Como complemento al modelo de pequena senal se plantea un modelo de gran senal implementado sobre el simulador Pspice. Con este nuevo modelo se reproducen los resultados obtenidos con el modelo de pequena senal y ademas es posible simular los transitorios en las tensiones de salida ante cambios de carga. La modelizacion del convertidor cuando el transformador se controla con una tension PWM sin filtrar es el objetivo del Capitulo 4. En las secciones siguientes del Capitulo se plantea el correspondiente modelo de gran senal aplicado a un nuevo prototipo exper

Ferreres Sabater, Agustin

310

A nanoparticle catalyst for heterogeneous phase para-hydrogen-induced polarization in water.  

PubMed

Para-hydrogen-induced polarization (PHIP) is a technique capable of producing spin polarization at a magnitude far greater than state-of-the-art magnets. A significant application of PHIP is to generate contrast agents for biomedical imaging. Clinically viable and effective contrast agents not only require high levels of polarization but heterogeneous catalysts that can be used in water to eliminate the toxicity impact. Herein, we demonstrate the use of Pt?nanoparticles capped with glutathione to induce heterogeneous PHIP in water. The ligand-inhibited surface diffusion on the nanoparticles resulted in a (1) H?polarization of P=0.25?% for hydroxyethyl propionate, a known contrast agent for magnetic resonance angiography. Transferring the (1) H?polarization to a (13) C?nucleus using a para-hydrogen polarizer yielded a polarization of 0.013?%. The nuclear-spin polarizations achieved in these experiments are the first reported to date involving heterogeneous reactions in water. PMID:25565403

Glöggler, Stefan; Grunfeld, Alexander M; Ertas, Yavuz N; McCormick, Jeffrey; Wagner, Shawn; Schleker, P Philipp M; Bouchard, Louis-S

2015-02-16

311

UNESP, para obtenção do título de Mestre no Programa de Pós Graduação  

E-print Network

Bendito seja o Senhor, minha rocha, que adestra as minhas mãos para a peleja e os meus dedos para a guerra; Aquele que habita no esconderijo do Altíssimo, à sombra do Onipotente descansará. Direi do Senhor: Ele é o meu Deus, o meu refúgio, a minha fortaleza, e nele confiarei. Porque ele te livrará do laço do passarinheiro, e da peste perniciosa. Ele te cobrirá com as suas penas, e debaixo das suas asas estarás seguros; a sua verdade será o teu escudo e broquel. Não terás medo do terror de noite nem da seta que voa de dia, Nem da peste que anda na escuridão, nem da mortandade que assola ao meio-dia. Mil cairão ao teu lado, e dez mil à tua direita, mas tú não serás atingido. O Senhor é a minha luz e a minha salvação; a quem temerei? O Senhor é a força da minha vida; de quem me recearei?

De Biociências; Campus De Botucatu; Processo De; Carcinogênese De; Esôfago Em; Ratos Wistar; Juliana Ferreira Da Silva; Em Biologia Geral E Aplicada; Botucatu Sp; Juliana Ferreira Da Silva; Processo De; Carcinogênese De; Esôfago Em; Ratos Wistar; Câmpus De Botucatu; Em Biologia Geral E Aplicada; Orientador Prof; Dr. Luís Fern; O Barbisan; Prof Dr; Luís Fernando Barbisan; Profa Dra; Lígia Souza; Lima Silveira; Mota Dedicatória

312

Desarrollo de un receptor polarimétrico en banda S para aplicación en estudios radioastronómicos  

NASA Astrophysics Data System (ADS)

Desde el punto de vista tecnológico, el objetivo principal de este proyecto es desarrollar un cabezal de receptor en la frecuencia de 3.3 GHz, con una temperatura del sistema de 60 K y un ancho de banda de 140 MHz. El mismo será instalado en el foco primario de un reflector parabólico de 30 metros de diámetro que funcionará como radiómetro en el IAR. El receptor es del tipo polarimétrico, con lo cual permite la posibilidad de obtener las componentes de polarización lineal y circular. Para tal fin el cabezal constará de dos ramas receptoras que amplificarán la señal y la trasladarán a una frecuencia menor, (frecuencia intermedia), permitiendo de esa forma un mejor transporte de la señal a la sala de control para su posterior procesamiento. El receptor, además de tener características polarimétricas, podrá ser usado en el contínuo y en la línea, utilizando las ventajas observacionales y de procesamiento de señal que actualmente posee el IAR.

Barberis, C. M.; Bava, J. A.; Sanz, A. J.

313

Incentivos para atraer y retener personal de salud de zonas rurales del Perú: un estudio cualitativo  

PubMed Central

El objetivo fue identificar incentivos de atracción y retención en zonas rurales y distantes de Ayacucho, Perú. Fueron realizadas entrevistas en profundidad con 80 médicos, enfermeras, obstetras y técnicos (20 por grupo) de las zonas más pobres y con 11 funcionarios. No existen políticas sistemáticas de atracción y retención de personal de salud en Ayacucho. Los principales incentivos, en orden de importancia, fueron mejoras salariales, oportunidades de formación y capacitación, estabilidad laboral y nombramiento, mejoras en infraestructura y equipos, e incremento del personal. Se mencionaron también mejoras en la vivienda y alimentación, mayor cercanía con la familia y reconocimiento por el sistema de salud. Existen coincidencias y singularidades entre los distintos grupos sobre los incentivos clave para estimular el trabajo rural, que deben considerarse al diseñar políticas públicas. Las iniciativas del Estado deben comprender procesos rigurosos de monitoreo y evaluación, para asegurar que las mismas tengan el impacto deseado. PMID:22488318

Huicho, Luis; Canseco, Francisco Díez; Lema, Claudia; Miranda, J. Jaime; Lescano, Andrés G.

2014-01-01

314

Repeated Topical Application of para-Phenylenediamine Induces Renal Histopathological Changes in Rats  

PubMed Central

Hemolytic anemia and rhabdomyolysis have been often reported to be an adverse effect of drug- and chemical-induced toxicity both in experimental and real-life scenario. para-Phenylenediamine (PPD) is a derivative of para-nitroaniline and has been found as an ingredient of almost all hair dye formulations in varying concentrations from 2% to 4% w/v. Earlier studies have reported that the accidental oral ingestion of PPD in humans can lead to acute renal failure because of rhabdomyolysis. In the present investigation, we have tested the chronic topical application of PPD and its effect on the renal histology of Sprague-Dawley rats. The experiment provides clear evidence that topically applied PPD induces hemolytic anemia as evident from the decrease in the total RBC count, packed cell volume, and hemoglobin content apart from rhabdomyolysis which subsequently causes acute renal failure in rats. PMID:22778510

Bharali, Manuj Kr.; Basumatary, Rajeev; Rahman, Taibur; Dutta, Karabi

2012-01-01

315

Development of an integrated remote monitoring technique and its application to para-stressing bridge system  

NASA Astrophysics Data System (ADS)

Bridge monitoring system via information technology is capable of providing more accurate knowledge of bridge performance characteristics than traditional strategies. This paper describes not only an integrated Internet monitoring system that consists of a stand-alone monitoring system (SMS) and a Web-based Internet monitoring system (IMS) for bridge maintenance but also its application to para-stressing bridge system as an intelligent structure. IMS, as a Web-based system, is capable of addressing the remote monitoring by introducing measuring information derived from SMS into the system through Internet or intranet connected by either PHS or LAN. Moreover, the key functions of IMS such as data management system, condition assessment, and decision making with the proposed system are also introduced in this paper. Another goal of this study is to establish the framework of a para-stressing bridge system which is an intelligent bridge by integrating the bridge monitoring information into the system to control the bridge performance automatically.

Miyamoto, Ayaho; Motoshita, Minoru; Casas, Joan R.

2013-12-01

316

Optical properties of two-electron quantum dots in low lying para- and ortho-states  

NASA Astrophysics Data System (ADS)

Two low lying energy levels of 3D two-electron quantum dot with rigid confinement (the wave functions vanish at the surface of the quantum dot) are obtained by the variational and perturbation methods. There are two kind of quantum dots: para- and ortho-dots with antiparallel and parallel electron spins, respectively. An ensemble of the two-electron quantum dots contains para-dots in the ground state and ortho-dots in the lowest metastable state at low enough temperatures. The optical parameters of GaAs two-electron quantum dot are calculated with the help of obtained energy levels and compared with the optical parameters known for the one electron GaAs quantum dot. The Coulomb interaction between electrons is responsible for the blue shift of maxima of the absorption coefficient and refractive index of two-electron quantum dots.

Mengesha, Menberu; Mal'nev, Vadim

2012-07-01

317

Chirality driven crystallization behavior of ortho, meta, and para-cyanophenyl glycerol ethers  

NASA Astrophysics Data System (ADS)

Enantiopure and racemic samples of ortho, meta, and para CN-substituted phenyl glycerol ethers 1- 3 were investigated by differential scanning calorimetry and single-crystal X-ray analysis. The absolute configuration for ( S)- 1 was established through Flack parameter method. Whereas ortho-derivative 1 demonstrates spontaneous resolution upon crystallization, homochiral lattice for scalemic meta-derivative 2 is exceeded in stability by heterochiral lattice of racemic compound. This tendency becomes all the more evident for the para-derivative 3, in which case the difference in Gibbs free energy between rac and scal lattices amounts ? G0 = -4.48 kJ mol -1. Most of these phenomena could be understood by reference to crystal packing details.

Bredikhin, Alexander A.; Litvinov, Igor A.; Krivolapov, Dmitry B.; Fattahov, Bulat R.; Gubaidullin, Aidar T.; Akhatova, Flyura S.; Bredikhina, Zemfira A.

2010-09-01

318

Sasaki-Einstein and paraSasaki-Einstein metrics from (?,?)-structures  

NASA Astrophysics Data System (ADS)

We prove that every contact metric (?,?)-space admits a canonical ?-Einstein Sasakian or ?-Einstein paraSasakian metric. An explicit expression for the curvature tensor fields of those metrics is given and we find the values of ? and ? for which such metrics are Sasaki-Einstein and paraSasaki-Einstein. Conversely, we prove that, under some natural assumptions, a K-contact or K-paracontact manifold foliated by two mutually orthogonal, totally geodesic Legendre foliations admits a contact metric (?,?)-structure. Furthermore, we apply the above results to the geometry of tangent sphere bundles and we discuss some geometric properties of (?,?)-spaces related to the existence of Einstein-Weyl and Lorentzian-Sasaki-Einstein structures.

Cappelletti-Montano, Beniamino; Carriazo, Alfonso; Martín-Molina, Verónica

2013-11-01

319

Photoconduction in thin films of a ladder-type poly-para-phenylene  

Microsoft Academic Search

Stationary photoconductivity has been measured on typically 100 nm thick films of a methyl-substituted ladder-type poly-para-phenylene sandwiched between indium–tin oxide (ITO) and aluminium (Al) electrodes. Three contributions to photocarrier production have been identified: (1) hole injection from the ITO and the Al-anode via dissociation of singlet excitons; (2) intrinsic carrier production via relaxed S1 excitons; and (3) intrinsic photogeneration via

S. Barth; H. Bässler; U. Scherf; K. Müllen

1998-01-01

320

Structure, morphology, and optical properties of highly ordered films of para-sexiphenyl  

Microsoft Academic Search

We have investigated the properties of highly textured films of para-sexiphenyl (6P). The films are obtained by evaporation in high vacuum with different deposition rates and substrate temperatures. The crystal structure is analyzed by x-ray and elastic electron diffraction. Depending on the evaporation conditions and on the substrate pretreatment we find a marked texturing of the films. To better understand

E. Zojer; N. Koch; P. Puschnig; F. Meghdadi; A. Niko; R. Resel; C. Ambrosch-Draxl; M. Knupfer; J. Fink; J. L. Brédas; G. Leising

2000-01-01

321

Extensão do WEKA para Métodos de Agrupamento com Restrição de Contigüidade  

Microsoft Academic Search

This work addresses the shortage of open-source data mining tools that implement spatial data mining methods. Therefore, this work presents the development of a WEKA extension for contiguity-constrained clustering method. Resumo. Este trabalho aponta a pouca disponibilidade de ferramentas de mineração de dados de código-aberto que implementam métodos de mineração de dados espaciais. Portanto, o objetivo deste trabalho, para tentar

Carlos Eduardo; R. de Mello; Geraldo Zimbrão da Silva; Jano M. de Souza; Caixa Postal

2007-01-01

322

Lanzamiento del estudio de tratamiento personalizado para el cáncer de seno  

Cancer.gov

Hoy se inició el Estudio de Asignación de Opciones Individualizadas de Tratamiento (Trial Assigning IndividuaLized Options for Treatment (Rx), o TAILORx, el cual evaluará si los genes que están frecuentemente asociados con el riesgo de recurrencia entre las mujeres con cáncer de seno en etapa inicial pueden ser utilizados para asignar a las pacientes el tratamiento más adecuado y efectivo. Preguntas y respuestas

323

Structural elucidation, Hirshfeld surface analysis and quantum mechanical study of para-nitro benzylidene methyl arjunolate  

Microsoft Academic Search

A benzylidene derivative of arjunolic acid, namely, para-nitro benzylidene methyl arjunolate (3) have been synthesized and characterized by X-ray structural studies and the electronic structure was calculated at the DFT level with a detailed analysis of Hirshfeld surface and fingerprint plot facilitating a comparison of intermolecular interactions. The crystal packing of (3) exhibits intermolecular O-H⋯O and C-H⋯O hydrogen bonds forming

Saikat Kumar Seth; Gopal Chandra Maity; Tanusree Kar

2011-01-01

324

pH-dependent nitration of para-hydroxyphenylacetic acid in the stomach  

Microsoft Academic Search

The major urinary metabolite of nitrotyrosine is 3-nitro-4-hydroxyphenylacetic acid (3-Nitro-HPA). However, recent animal studies have shown that the majority of urinary 3-Nitro-HPA is derived from nitration of endogenous para-hydroxyphenylacetic acid (HPA), a metabolite of tyrosine. One potential site for the formation of 3-Nitro-HPA is the stomach, where nitrous acid is formed by the reaction of nitrite in saliva with gastric

Ananth S. Pannala; Ali R. Mani; Catherine A. Rice-Evans; Kevin P. Moore

2006-01-01

325

Para-position derivatives of fungal anthelmintic cyclodepsipeptides engineered with Streptomyces venezuelae antibiotic biosynthetic genes  

Microsoft Academic Search

PF1022A, a cyclooctadepsipeptide possessing strong anthelmintic properties and produced by the filamentous fungus Rosellinia sp. PF1022, consists of four alternating residues of N-methyl-L-leucine and four residues of D-lactate or D-phenyllactate. PF1022A derivatives obtained through modification of their benzene ring at the para-position with nitro or amino groups act as valuable starting materials for the synthesis of compounds with improved anthelmintic

Naomi Sumida; Kaoru Okakura; Tatsuki Moriya; Manabu Watanabe; Takeshi Murakami; Koji Yanai

2004-01-01

326

Structural elucidation, Hirshfeld surface analysis and quantum mechanical study of para-nitro benzylidene methyl arjunolate  

Microsoft Academic Search

A benzylidene derivative of arjunolic acid, namely, para-nitro benzylidene methyl arjunolate (3) have been synthesized and characterized by X-ray structural studies and the electronic structure was calculated at the DFT level with a detailed analysis of Hirshfeld surface and fingerprint plot facilitating a comparison of intermolecular interactions. The crystal packing of (3) exhibits intermolecular O–H?O and C–H?O hydrogen bonds forming

Saikat Kumar Seth; Gopal Chandra Maity; Tanusree Kar

2011-01-01

327

Anomalous Thermal Expansion of the Short Intermolecular Bond in para-Nitro-aniline  

Microsoft Academic Search

A RECENT determination of the detailed crystal structure of para-nitro-aniline has revealed an un usually short distance of approach (2.66 A.) between the oxygen atom of an NO2 group of one molecule and one of the carbon atoms of the aromatic nucleus on a proximate molecule1. This suggests special forces between these two atoms, the attraction of which appears to

P. J. McKeown; A. R. Ubbelohde; I. Woodward

1950-01-01

328

Raman, surface-enhanced Raman scattering and DFT study of para-nitro-aniline  

Microsoft Academic Search

Raman spectra of para-nitro-aniline (pNA), a molecule with high applicability potential in molecular electronics, were recorded in solid state and in ethanol solution. Complete assignment of the experimental spectra was made by using the B3LYP\\/6-31G(d) theoretical results. The calculated molecular electrostatic potential shows a high negative charge localized on the nitro group of pNA and the surface-enhanced Raman scattering (SERS)

Vasile Chi?; Monica M. Venter; Nicolae Leopold; Onuc Cozar

2008-01-01

329

Aplicao de Tcnicas de Redes Sociais para o Sucesso Alexandre Baro  

E-print Network

Aplicação de Técnicas de Redes Sociais para o Sucesso Educativo Alexandre Barão alexandrebarao combate ao insucesso escolar. A análise de redes sociais concentra-se nas relações existentes entre informação electrónicos, a aplicação da análise de redes sociais pode proporcionar um conjunto de inferências

da Silva, Alberto Rodrigues

330

Programa de Ps-Graduao em Metrologia Mestrado rea de Concentrao: Metrologia para Qualidade e Inovao  

E-print Network

Estratégica da Inovação e Sustentabilidade Aborda os fundamentos da Tecnologia Industrial Básica vis-a-vis os modelos conceituais e estudos empíricos de gestão da inovação e de sustentabilidade. Redes Inteligentes) para a configuração de redes inteligentes de energia. 4. Das Inscrições 4.1) As inscrições deverão ser

331

Parallel Visualization and Analysis with ParaView on a Cray XT4  

SciTech Connect

Scienti c data sets produced by modern supercomputers like ORNL s Cray XT 4, Jaguar, can be extremely large, making visualization and analysis more di cult as moving large resultant data to dedicated analysis systems can be pro- hibitively expensive. We share our continuing work of integrating a parallel visu- alization system, ParaView, on ORNL s Jaguar system and our e orts to enable extreme scale interactive data visualization and analysis. We will discuss porting challenges and present performance numbers.

Patchett, John [Los Alamos National Laboratory (LANL); Ahrens, James [Los Alamos National Laboratory (LANL); Ahern, Sean [ORNL; Pugmire, Dave [ORNL

2009-01-01

332

Sartenejas, 29 de junio de 2010 Criterios para la implantacin del documento electrnico  

E-print Network

Venezuela: aspectos legales, uso y certificación. Foro #12;Maribel De Sousa Centro Nacional de Tecnologías electrónica en Venezuela Hildamar Fernández Superintendencia de Servicios de Certificación Electrónica Marco Legal de la Certificación Electrónica y la Seguridad de información en Venezuela Criterios para la

Vásquez, Carlos

333

3D visualization of cardiac anatomical MRI data with para-cellular resolution.  

PubMed

Advances in research and clinical techniques are providing increasing quantities of data at improved spatio-temporal resolution. It is therefore imperative to develop matching approaches for efficient analysis and intuitive presentation of this data. Using the example of advanced magnetic resonance imaging, this article will illustrate the challenges involved in computational reconstruction and interactive visualization of the three-dimensional cardiac anatomy, based on magnetic resonance imaging data with para-cellular resolution. PMID:18001910

Goodyer, Christopher E; Grau, Vicente; Mansoori, Tahir; Schneider, Jurgen E; Brodlie, Ken W; Kohl, Peter

2007-01-01

334

Instrucciones para el Consentimiento de alguien que no es uno de los  

E-print Network

Instrucciones para el Consentimiento de alguien que no es uno de los padres a tratamiento médico Al final de la línea #1, escriba con letra de molde el nombre del menor. Sólo el nombre de un menor puede una copia a la forma. En las líneas #3 y #4, escriba con letra de molde el nombre completo del padre y

335

APLICAO DA ANLISE EXPLORATRIA PARA AVALIAO DA DIFERENCIAO DE ALIMENTOS PRODUZIDOS  

E-print Network

APLICA��O DA ANÁLISE EXPLORAT�RIA PARA AVALIA��O DA DIFERENCIA��O DE ALIMENTOS PRODUZIDOS orgânica e a expansão do consumo de alimentos assim produzidos. A área cultivada com produtos produzidos. As exportações do setor crescem a taxas de 50% ao ano. Nesse contexto, a indústria de alimentos necessita cada

Ferreira, Márcia M. C.

336

Spontaneous rearrangement of para-sexiphenyl crystallites into nano-fibers  

Microsoft Academic Search

In the growth of para-sexiphenyl films on mica(001), an interesting phenomenon was observed where small individual crystallites\\u000a spontaneously arrange into parallel running high-aspect ratio chains with a length in the micrometer range. A statistical\\u000a analysis of the chain dimensions reveals a very narrow length distribution and the existence of a threshold length. The observation\\u000a of denuded zones around the chains

C. Teichert; G. Hlawacek; A. Yu. Andreev; H. Sitter; P. Frank; A. Winkler; N. S. Sariciftci

2006-01-01

337

PROCEDIMENTOS PARA RECOLHIMENTO DE VALORES REFERENTES INSCRIO EM PROCESSOS SELETIVOS DOS CURSOS DE MESTRADO E DOUTORADO  

E-print Network

) 6) Competência: mês/ano do pagamento; 7) Vencimento: dia/mês/ano do pagamento; 8) CNPJ/CPF do interessado; 9) Nome do interessado; 12) Emitir GRU; 13) Imprimir; 14) Pagamento no Banco do Brasil em a impressão para posterior pagamento no Banco do Brasil. 4. Esta ordem de serviço entra em vigor a partir de

Paraná, Universidade Federal do

338

El tratamiento con cloro es un mtodo para desinfectar un pozo de agua. Se recomien-  

E-print Network

exceso de lluvia entran en el pozo. Si el agua subterránea constituye en sí la fuente de bacterias, elEl tratamiento con cloro es un método para desinfectar un pozo de agua. Se recomien- da cuando un sistema de agua está contam- inado con bacterias. La contaminación puede ocurrir en la instalación del

339

Theoretical and Experimental Studies on the Nonlinear Optical Chromophore para Bromoacetanilide  

Microsoft Academic Search

Vibrational spectral analysis of the hydrogen bonded non-linear optical (NLO) material para Bromo Acetanilide (PBA) is carried out using NIR FT-Raman and FT-IR spectroscopy. Ab initio molecular orbital computations have been performed at HF\\/6-31G(d) level to derive equilibrium geometry, vibrational wavenumbers, intensities and first hyperpolarizability. The lowering of the imino stretching wavenumbers suggests the existence of strong intermolecular N-H...O hydrogen

V. Bena Jothy; T. Vijayakumar; V. S. Jayakumar; K. Udayalekshmi; K. Ramamurthy; I. Hubert Joe

2008-01-01

340

Problema: Merzbacher 18.11 Aplique teoria de perturbao em segunda ordem para o potencial peridico  

E-print Network

Problema: Merzbacher 18.11 Aplique teoria de perturbação em segunda ordem para o potencial no limite L as funções de onda não perturbadas são ondas planas. b) Mostre que a teoria de perturbação não fronteira da zona de Brillouin deste problema, região onde a teoria não-degenerada falha pois En = En+r N

de Aguiar, Marcus A. M.

341

REDES-Revista hispana para el anlisis de redes sociales Vol.9,#6, Diciembre 2005  

E-print Network

REDES- Revista hispana para el análisis de redes sociales Vol.9,#6, Diciembre 2005 http://revista-redes sociales. Palabras clave: Análisis de Redes, Redes Políticas, Redes Sociales, Visualización de redes.rediris.es La explicación a través de la visualización de redes1 Ulrik Brandes, Universidad de Konstanz

Brandes, Ulrik

342

REDES-Revista hispana para el anlisis de redes sociales Vol.6,#7, Junio 2009  

E-print Network

REDES- Revista hispana para el análisis de redes sociales Vol.6,#7, Junio 2009 http://revista-redes.rediris.es En busca del contenido de las redes sociales: los "motivos" de las relaciones1 Claire Bidart2 , CNRS devolverle a la relación social su importancia como unidad básica de las redes sociales, y explorar lo que

Paris-Sud XI, Université de

343

REDES-Revista hispana para el anlisis de redes sociales Vol.15, #4, Diciembre 2008  

E-print Network

REDES- Revista hispana para el análisis de redes sociales Vol.15, #4, Diciembre 2008 http://revista-redes mixtos ­ análisis de redes sociales - visualización. Abstract By analyzing two waves of personal networksLab, Departament d'Antropologia social i cultural ­ UAB. Silvia.gomez@uab.cat. #12;36 Las redes personales desde un

Brandes, Ulrik

344

REDES-Revista hispana para el anlisis de redes sociales Vol.19,#10, Diciembre 2010  

E-print Network

REDES- Revista hispana para el análisis de redes sociales Vol.19,#10, Diciembre 2010 http://revista-redes industrial. El desarrollo de los métodos de análisis de redes sociales ha dado un nuevo impulso a los.rediris.es Redes de consejo en la industria biotecnológica en Francia1 Alvaro Piña-Stranger2 ­ IRISSO (CNRS

Boyer, Edmond

345

Abierto el plazo de presentacin de propuestas para la Semana de la Ciencia 2012  

E-print Network

Abierto el plazo de presentación de propuestas para la Semana de la Ciencia 2012 Un año más, bajo el lema Ven a la Ciencia, el Área de Cultura Científica de la OTRI-UCM se va a encargar de la coordinación de las propuestas de actividades que ofrecerá nuestra Universidad durante la Semana de la Ciencia

346

16. mu. m para-H/sub 2/ stimulated Raman laser  

SciTech Connect

A para-H/sub 2/ stimulated Raman laser pumped by a TEA CO/sub 2/ laser was developed. The main factors affecting Raman conversion efficiency are discussed. At a working temperature of 100 K, the maximum output energy of the Stokes beam at 16 ..mu..m was 536 mJ, corresponding to an energy conversion efficiency of 13% and a quantum conversion efficiency greater than 20%.

Jin Chunzhi; Lin Taiji; Wu Xuhua; Niu Zhenya; Ding Yishan; Li Dianjun; Zhu Youxin; Li Yulan; Yang Jinfeng; Wang Naihong; and others

1988-08-01

347

Reconocer los derechos de los migrantes para fortalecer la integracin regional  

E-print Network

Reconocer los derechos de los migrantes para fortalecer la integración regional Buscando una vida su derecho al trabajo. ·El bienestar de las personas migrantes requiere que el Estado y los empleadores garanticen sus derechos sin distinción de condición jurídica, política o social. ·Los más

Richner, Heinz

348

E-001 Partial central retinal artery occlusion following para-ophthalmic artery embolization: a case report  

Microsoft Academic Search

BackgroundCoil embolization of para-ophthalmic artery aneurysms can result in acute as well as delayed visual complications. Progressive visual changes have been have been ascribed to mass effect from aneurysm thrombosis or peri-aneurysmal inflammation or edema. Abrupt, fixed visual changes are likely secondary to thromboembolic complications which result in retinal infarcts via the ophthalmic artery. Although thromboembolic complications are well described

S Chowdhry; J Sharma; K Blackham

2011-01-01

349

Ground state and excited state dipole moments of alkyl substituted para-nitroaniline derivatives.  

PubMed

The ground state and excited state dipole moment of a series of alkyl substituted para-nitroaniline derivatives is reported. Ground state dipole moment was determined by the Debye-Guggenheim method and the excited state dipole moment was estimated using the solvatochromic method. For all molecules under investigation, the excited state dipole moment was found to be higher than the ground state dipole moment. The molecules exhibited positive solvatochromism. PMID:18524672

Dhanya, R; Kishore, V C; Sudha Kartha, C; Sreekumar, K; Joseph, Rani

2008-12-15

350

Stable self-trapping and ring formation in polydiacetylene para-toluene sulfonate  

NASA Astrophysics Data System (ADS)

Numerical simulations of two-dimensional beam propagation in polydiacetylene para-toluene sulfonate measured values for n2>0 and n3<0 , where Delta n=n2I+n 3I2 , predict stable self-trapping and a new phenomenon in which a spatial ring evolves from a Gaussian input beam. We interpret the numerical results theoretically, using the variational model of nonlinear Gaussian beam propagation.

Wright, Ewan M.; Lawrence, Brian L.; Torruellas, William; Stegeman, George

1995-12-01

351

Desenvolvimento de um programa computacional para implantação econômica de lavouras canavieiras  

Microsoft Academic Search

Desenvolveu-se um algoritmo para a implantação convencional de lavouras canavieiras e em adição, uma implantação diferenciada com a finalidade de proporcionar produções, em toneladas, iguais nos anos subseqüentes à implantação, visto que, com o passar dos anos, as produtividades da cana-de-açúcar são diferentes; contudo, a nova metodologia fica limitada à área máxima de plantio, sendo que, em alguns casos, a

Tadeu A. Marques; Gil E. Serra; Patrícia A. A. Marques

2006-01-01

352

Estratgias de Integrao Reduzida para Clculo de Velocidades e Presses em Meios Porosos  

E-print Network

computacional. São apresentados exemplos numéricos de validação, incluindo a análise numérica dos esquemas de­se uma alternativa interessante para diminuir o custo computacional da avaliação destas integrais eficiencia computacional. Algumas metodologias de estabilização (hourglass control) já são utilizadas

Coutinho, Alvaro L. G. A.

353

Geometria Computacional para Visualizacion: El marco Perez-Moneo Agapito, Juan Diego Finat Codes, Javier  

E-print Network

Geometr´ia Computacional para Visualizaci´on: El marco UvaCAD P´erez-Moneo Agapito, Juan Diego Geometr´ia Com- putacional, Visi´on Computacional e Inform´atica Gr´afica, pero ninguna biblioteca que´onico). UvaCad integra diferentes librer´ias de Geometr´ia y Visi´on Computacional y diversas librer´ias gen

Llanos, Diego R.

354

A sensitive and selective enzyme-linked immunosorbent assay for the analysis of Para red in foods.  

PubMed

Para red is a synthetic dye and a potential genotoxic carcinogen. A hapten mimicking Para red structure was synthesized by introducing a carboxyl to the naphthol part of Para red and coupled to carrier protein to form an immunogen for the production of specific antibodies. A sensitive and selective enzyme-linked immunosorbent assay (ELISA) was developed for the detection of Para red in food samples. The limit of detection and inhibition half-maximum concentrations of Para red in phosphate buffered saline with 10% methanol were 0.06 and 2.2 ng mL(-1), respectively. Cross-reactivity values of the ELISA with the tested compounds including Sudan red I, II, III, IV, and G, sunset yellow, 2-naphthol, and 4-nitroaniline were ?0.2%. This assay was used to determine Para red in tomato sauce, chilli sauce, chilli powder and sausage samples after ultrasonic extraction, cleanup and concentration steps. The average recoveries, repeatability (intraday extractions and analysis), and intra-laboratory reproducibility (interday extractions and analysis) were in the range 90-108%, 4-12% and 8-17%, respectively. This assay was compared to a high-performance liquid chromatographic method for 28 samples, displaying a good correlation (R(2) = 0.95). Para red residues in 53 real world samples determined by ELISA were below the limit of detection. PMID:22439137

Wang, Jia; Wei, Keyi; Li, Hao; Li, Qing X; Li, Ji; Xu, Ting

2012-05-01

355

Isolation and characterization of a novel Rhodococcus strain with switchable carbonyl reductase and para-acetylphenol hydroxylase activities.  

PubMed

In the search for an effective biocatalyst for the reduction of acetophenones with unprotected hydroxy group on the benzene ring, a microorganism, which reduced para-acetylphenol to S-(-)-1-(para-hydroxyphenyl)ethanol under anaerobic conditions, was isolated from soil samples and the 16S rDNA study showed that it was phylogenetically affiliated with species of the genus Rhodococcus and was most similar to Rhodococcus pyridinivorans. Unexpectedly, this strain also hydroxylated para-acetylphenol to give 4-acetylcatechol in presence of oxygen, possessing para-acetylphenol hydroxylase activity. While the reduction of para-acetylphenol had an optimal reaction pH at 7 and a broad optimal temperature range (35-45 °C), the hydroxylation reached the maximum conversion at the pH range of 7-8 and 35 °C. This study identified for the first time a Rhodococcus strain with para-acetylphenol hydroxylase activity, which also contains highly enantioselective carbonyl reductase activity with potential applications for the asymmetric reduction of these less-explored but important ketones such as ?-aminoacetophenone, 3'-hydroxyacetophenone and 4'-hydroxyacetophenone. The para-acetylphenol hydroxylase and carbonyl reductase activity are switchable by the reaction conditions. PMID:23014895

Zhang, Rui; Ren, Jie; Wang, Yu; Wu, Qiaqing; Wang, Min; Zhu, Dunming

2013-01-01

356

The ortho:para ratio of H3+ in laboratory and astrophysical plasmas  

NASA Astrophysics Data System (ADS)

The discovery of H3+ in the diffuse interstellar medium has dramatically changed our view of the cosmic-ray ionization rate in diffuse molecular clouds. However, another surprise has been that the ortho:para ratio of H3+ in these clouds is inconsistent with the temperature derived from the excitation of H2, the dominant species in these clouds. In an effort to understand this discrepancy, we have embarked on an experimental program to measure the nuclear spin dependence of the dissociative electron recombination rate of H3+ using the CRYRING and TSR ion storage rings. We have also performed the first measurements of the reaction H3++ H2? H2+ H3+ below room temperature. This reaction is likely the most common bimolecular reaction in the universe, and plays an important role in interconverting ortho- and para-H3+. Finally, we have constructed a steady-state chemical model for diffuse clouds, which takes into account the spin-dependence of the formation of H3+, its electron recombination, and its reaction with H2. We find that the ortho:para ratio of H3+ in diffuse clouds is likely governed by a competition between dissociative recombination and thermalization by reactive collisions.

Crabtree, Kyle N.; Indriolo, Nick; Kreckel, Holger; McCall, Benjamin J.

2015-01-01

357

A non-equilibrium ortho-to-para ratio of water in the Orion PDR  

E-print Network

The ortho-to-para ratio (OPR) of H$_2$O is thought to be sensitive to the temperature of water formation. The OPR of H$_2$O is thus useful to study the formation mechanism of water. We investigate the OPR of water in the Orion PDR (Photon-dominated region), at the Orion Bar and Orion S positions, using data from {\\it Herschel}/HIFI. We detect the ground-state lines of ortho- and para-H$_2$$^{18}$O in the Orion Bar and Orion S and we estimate the column densities using LTE and non-LTE methods. Based on our calculations, the ortho-to-para ratio (OPR) in the Orion Bar is 0.1 $-$ 0.5, which is unexpectedly low given the gas temperature of $\\sim$ 85 K, and also lower than the values measured for other interstellar clouds and protoplanetary disks. Toward Orion S, our OPR estimate is below 2. This low OPR at 2 positions in the Orion PDR is inconsistent with gas phase formation and with thermal evaporation from dust grains, but it may be explained by photodesorption.

Choi, Y; Bergin, E A; Plume, R

2014-01-01

358

Fragrance material review on 1-(para-menthen-6-yl)-1-propanone.  

PubMed

A toxicologic and dermatologic review of 1-(para-Menthen-6-yl)-1-propanone when used as a fragrance ingredient is presented. 1-(para-Menthen-6-yl)-1-propanone is a member of the fragrance structural group Alkyl Cyclic Ketones. These fragrances can be described as being composed of an alkyl, R1, and various substituted and bicyclic saturated or unsaturated cyclic hydrocarbons, R2, in which one of the rings may include up to 12 carbons. Alternatively, R2 may be a carbon bridge of C2-C4 carbon chain length between the ketone and cyclic hydrocarbon. This review contains a detailed summary of all available toxicology and dermatology papers that are related to this individual fragrance ingredient and is not intended as a stand-alone document. Available data for 1-(para-Menthen-6-yl)-1-propanone were evaluated then summarized and includes physical properties, acute toxicity, skin irritation, and skin sensitization, data. A safety assessment of the entire Alkyl Cyclic Ketones will be published simultaneously with this document; please refer to Belsito et al. (2013) [Belsito, D., Bickers, D., Bruze, M., Calow, P., Dagli, M., Fryer, A.D., Greim, H., Miyachi, Y., Saurat, J.H., Sipes, I.G., 2013 A Toxicologic and Dermatologic Assessment of Alkyl Cyclic Ketones When Used as Fragrance Ingredients. Submitted with this manuscript.] for an overall assessment of the safe use of this material and all Alkyl Cyclic Ketones in fragrances. PMID:24246181

Scognamiglio, J; Letizia, C S; Api, A M

2013-12-01

359

The ortho:para-H_2 ratio in C- and J-type shocks  

NASA Astrophysics Data System (ADS)

We have computed extensive grids of models of both C- and J-type planar shock waves, propagating in dark, cold molecular clouds, in order to study systematically the behaviour of the ortho:para-H_2 ratio. Careful attention was paid to both macroscopic (dynamical) and microscopic (chemical reactions and collisional population transfer in H_2) aspects. We relate the predictions of the models to observational determinations of the ortho:para-H_2 ratio using both pure rotational lines and rovibrational lines. As an illustration, we consider ISO and ground-based H_2 observations of HH 54. Neither planar C-type nor planar J-type shocks appear able to account fully for these observations. Given the additional constraints provided by the observed ortho:para H_2 ratios, a C-type bowshock, or a C-type precursor followed by a J-type shock, remain as plausible models. Tables~2a-f and 4a-f are only available in electronic form at the CDS via anonymous ftp to cdsarc.u-strasbg.fr (130.79.128.5) or via http://cdsweb.u-strasbg.fr/Abstract.html

Wilgenbus, D.; Cabrit, S.; Pineau des Forêts, G.; Flower, D. R.

2000-04-01

360

[Neuroendoscopic surgery for intra- and para-ventricular tumors:impacts on biopsy and hydrocephalus treatment].  

PubMed

In this report, the authors retrospectively review and discuss their results for neuroendoscopic surgery for intra- and para-ventricular tumors. This study included 28 patients who were admitted to our hospital for intra- or para-ventricular tumors between January 2005 and March 2013. There were 17 males and 11 females, and their age varied widely from 1 to 75 years. Using a neuroendoscopic technique, tumor biopsy was attempted in all 28 patients. Biopsy was possible in 25 patients(89.3%)but not in the other 3(10.7%)because of hypervascularity or tumor bleeding. Of these 25 patients, pathological diagnosis was possible in 23(92%), but not in other 2(8%)because of incomplete sampling. In 18 of 28 patients, various forms of hydrocephalus were observed. Neuroendoscopic procedures were quite useful to improve cerebrospinal fluid dynamics in 13 of these patients, including endoscopic third ventriculostomy(ETV)in 9(except for 1 patient with ETV failure), septostomy with ventriculoperitoneal shunting(VPS)in 3, and cystostomy in 1. Simple VPS was performed in the other 4 patients. These results suggest that neuroendoscopic surgery is valuable as a minimally invasive procedure for pathological diagnosis and hydrocephalus treatments in patients with intra- and para-ventricular tumors. Further development of neuroendoscopic equipment is warranted to accurately diagnose tumors with hypervascularity and subependymal tumors. PMID:24598869

Kurosaki, Kunikazu; Hayashi, Nakamasa; Hamada, Hideo; Nagai, Shoichi; Endo, Shunro; Kuroda, Satoshi

2014-03-01

361

Atlas de aves: Un metodo para documentar distribucion y seguir poblaciones  

USGS Publications Warehouse

Los Atlas de Aves son proyectos nacionales o regionalies para trazar en mapas la distribucion en reproduccion de cada especie de ave. Ese procedimiento se esta usando en Europa, Australia, Nueva Zelanda, Norteamerica, y partes de Africa. El tama?o de los cuadrados varia de medio grado de latitud y Iongitud hasta 5 x 5 km. El trabajo de campo de cada proyecto exige aproxlmadamente cinco a?os, pero los aficionados pueden llevar a cabo la mayor parte del trabajo. Es posible almacenar los resultados en un computador personal. Hay muchos beneficios: (I) se presenta la distribucion corriente de las aves de la nacion, del estado, o de la Iocalidad; (2) se desarrolla nueva informacion especialmente sobre especies raras o en peligro; (3) se descubren areas que tienen una avlfauna sobresaliente o habitats raros y ayuda a su proteccion, (4) se documentan cambios de dlstribucion; (5) se pueden usar para documentar cambios de poblacion, especialmente en los tropicos donde otros metodos son mas dificiles de usar porque hay muchas especies y no hay muchos observadores calificados en la identificacion de sonidos de las aves; (6) son proyectos buenos de investigacion para estudiantes graduados; (7) los turistas y los jefes de excursiones de historia natural pueden contribuir con muchas informaciones

Robbins, C.S.; Dowell, B.A.; Dawson, D.K.

1988-01-01

362

Identification of an intact ParaHox cluster with temporal colinearity but altered spatial colinearity in the hemichordate Ptychodera flava  

PubMed Central

Background ParaHox and Hox genes are thought to have evolved from a common ancestral ProtoHox cluster or from tandem duplication prior to the divergence of cnidarians and bilaterians. Similar to Hox clusters, chordate ParaHox genes including Gsx, Xlox, and Cdx, are clustered and their expression exhibits temporal and spatial colinearity. In non-chordate animals, however, studies on the genomic organization of ParaHox genes are limited to only a few animal taxa. Hemichordates, such as the Enteropneust acorn worms, have been used to gain insights into the origins of chordate characters. In this study, we investigated the genomic organization and expression of ParaHox genes in the indirect developing hemichordate acorn worm Ptychodera flava. Results We found that P. flava contains an intact ParaHox cluster with a similar arrangement to that of chordates. The temporal expression order of the P. flava ParaHox genes is the same as that of the chordate ParaHox genes. During embryogenesis, the spatial expression pattern of PfCdx in the posterior endoderm represents a conserved feature similar to the expression of its orthologs in other animals. On the other hand, PfXlox and PfGsx show a novel expression pattern in the blastopore. Nevertheless, during metamorphosis, PfXlox and PfCdx are expressed in the endoderm in a spatially staggered pattern similar to the situation in chordates. Conclusions Our study shows that P. flava ParaHox genes, despite forming an intact cluster, exhibit temporal colinearity but lose spatial colinearity during embryogenesis. During metamorphosis, partial spatial colinearity is retained in the transforming larva. These results strongly suggest that intact ParaHox gene clustering was retained in the deuterostome ancestor and is correlated with temporal colinearity. PMID:23802544

2013-01-01

363

Estudio de terapias dirigidas para el cáncer de seno estableció un modelo de estudios clínicos a nivel mundial  

Cancer.gov

Dos medicamentos de acción dirigida, diseñados para tratar una forma agresiva de cáncer de seno (mama), se pusieron a prueba en un estudio que incluyó a 8 000 participantes en 44 países. Si bien la finalidad del estudio fue ayudar a que los investigadores determinaran si el tratamiento combinado con trastuzumab y lapatinib para el tratamiento del cáncer de seno HER2 positivo en estado inicial era mejor que la terapia solo con trastuzumab, los resultados del estudio no indicaron que existan ventajas para las mujeres al recibir la combinación de fármacos de trastuzumab o lapatinib.

364

A single amino acid change in the para sodium channel protein is associated with knockdown-resistance ( kdr) to pyrethroid insecticides in German cockroach  

Microsoft Academic Search

Previous genetic and pharmacological studies suggest that knockdown-resistance (kdr) to pyrethroid insecticides likely results from a mutation(s) in the para sodium channel gene. In this study, para sodium channel genes from an insecticide-susceptible German cockroach strain, CSMA, and a kdr-type German cockroach strain, Ectiban-R, were cloned and sequenced. Comparison of the nucleotide sequences of paraCSMA and paraEctiban-R revealed two nucleotide

Ke Dong

1997-01-01

365

ParaDyn Implementation in the US Navy's DYSMAS Simulation System: FY08 Progress Report  

SciTech Connect

The goal of this project is to increase the computational efficiency and capacity of the Navy's DYSMAS simulation system for full ship shock response to underwater explosion. Specifically, this project initiates migration to a parallel processing capability for the structural portion of the overall fluid-structure interaction model. The capstone objective for the first phase is to demonstrate operation of the DYSMAS simulation engine with a production model on a Naval Surface Warfare Center (IHD) parallel platform using the ParaDyn code for parallel processing of the structural dynamics. This year saw a successful launch to integrate ParaDyn, the high-parallel structural dynamics code from Lawrence Livermore National Laboratory (LLNL), into the DYSMAS system for simulating the response of ship structures to underwater explosion (UNDEX). The current LLNL version of DYNA3D, representing ten years of general development beyond the source branch used to initiate DYNA-N customization for DYSMAS, was first connected to the GEMINI flow code through DYSMAS Standard Coupler Interface (SCI). This permitted an early 'sanity check' by Naval Surface Warfare Center, Indian Head Division (NSWC-IHD) personnel that equivalent results were generated for their standard UNDEX test problems, thus ensuring the Verification & Validation pedigree they have developed remains intact. The ParaDyn code was then joined to the SCI in a manner requiring no changes to GEMINI. Three NSWC-IHD engineers were twice hosted at LLNL to become familiar with LLNL computer systems, the execution of the prototype software system, and to begin assessment of its accuracy and performance. Scaling data for the flow solver GEMINI was attained up to a one billion cell, 1000 processor run. The NSWC-IHD engineers were granted privileges to continue their evaluations through remote connections to LLNL's Open Computing Facility. Finally, the prototype changes were integrated into the mainline ParaDyn source repository and issued as part of its Version 8.1 beta release. This source was transmitted to NSWC-IHD and in collaboration with LLNL personnel the entire ParaDyn software suite successfully installed and demonstrated on its new SGI Altix machine. The ability of even minor numbers of processors for the structural dynamics to impact overall time-to-solution for DYSMAS has been demonstrated. Assessments of combined parallel efficiencies are beginning to highlight areas for further DYSMAS optimizations.

Ferencz, R M; DeGroot, A J; Lin, J I; Zywicz, E; Durrenberger, J K; Sherwood, R J; Corey, I R

2008-07-29

366

Aplicação de planejamento fatorial fracionário e box-behnken para otimização de extração com microgota para determinação de tricloroanisol e tribromoanisol de amostras de vinho por cromatografia a gás.  

E-print Network

??Neste trabalho foi desenvolvida uma metodologia analítica para determinação de 2,4,6-tricloroanisol e 2,4,6-tribromoanisol, os quais proporcionam cheiro de mofo ao vinho. A metodologia desenvolvida baseou-se… (more)

Edmar Martendal

2007-01-01

367

Resultados de estudio para cáncer de pulmón indican beneficio en mortalidad con el uso de tomografía computarizada de baja dosis  

Cancer.gov

El Instituto Nacional del Cáncer (NCI) da a conocer hoy resultados iniciales de un estudio de gran envergadura sobre métodos de detección para reducir el número de muertes por cáncer de pulmón al detectar cánceres en estadios relativamente iniciales.

368

IN VITRO EMBRYOTOXICITY OF A SERIES OF PARA-SUBSTITUTED PHENOLS: STRUCTURE, ACTIVITY AND CORRELATION WITH IN VIVO DATA  

EPA Science Inventory

The embryotoxicity of phenol and twelve para-substituted congeners on mid-gestation rat embryos was evaluated in vitro. hrough application of correlative procedures and stepwise regression, equation describing the relationship between physical-chemical properties and various meas...

369

APORTES TEÓRICO-METODOLÓGICOS PARA EL ESTUDIO DE LA PRODUCCIÓN SOCIAL DE SENTIDO A TRAVÉS DEL ANÁLISIS DEL DISCURSO PRESIDENCIAL  

Microsoft Academic Search

Este artículo presenta un enfoque teórico-metodológico para el estudio de las significaciones políticas. Se apunta a contribuir a la reflexión acerca del papel del discurso presidencial en la construcción de una \\

Víctor Armony

2005-01-01

370

2013-2014 Parent & Family Guide Texas Tech universiTy 1 especialmente para padres y familiares ........................................................................................ 2  

E-print Network

2013-2014 Parent & Family Guide Texas Tech universiTy 1 Contenido especialmente para padres y ........................................................ 8 recursos académicos en Texas Tech ..................................................................................................................... 22 Tradiciones de Texas Tech

Gelfond, Michael

371

MorphTrans: un lenguaje y un compilador para especi car y generar m odulos de transferencia  

E-print Network

;ogica avanza- da que es muy parecida a la utilizada en sis- temas de TA comerciales para PC tales como es un avance con res- pecto al mero an#19;alisis morfol#19;ogico y puede ser considerado como una

Forcada, Mikel L.

372

Dysregulation in Retinal Para-Inflammation and Age-Related Retinal Degeneration in CCL2 or CCR2 Deficient Mice  

Microsoft Academic Search

We have shown previously that a para-inflammatory response exists at the retinal\\/choroidal interface in the aging eye; and this response plays an important role in maintaining retinal homeostasis under chronic stress conditions. We hypothesized that dysregulation of the para-inflammatory response may result in an overt pro-inflammatory response inducing retinal degeneration. In this study, we examined this hypothesis in mice deficient

Mei Chen; John V. Forrester; Heping Xu

2011-01-01

373

Conformational isomerism in the solid-state structures of tetracaine and tamoxifen with para-sulphonato-calix[4]arene  

NASA Astrophysics Data System (ADS)

The solid-state complexes between para-sulphonato-calix[4]arene and the drugs tamoxifen and tetracaine show an unusual 4:1 guest-host stoichiometry with formation of hydrophobic layer of drug molecules held between bilayers of para-sulphonato-calix[4]arene. In both structures each of the four independent drug molecules adopts different conformation due to the different mode of interaction with the anionic host, the neighbouring drug cations and water molecules.

Danylyuk, Oksana; Monachino, Melany; Lazar, Adina N.; Suwinska, Kinga; Coleman, Anthony W.

2010-02-01

374

Su "Derecho a Saber" es el trmino genrico que describe los derechos legales de un empleado para obtener  

E-print Network

Su "Derecho a Saber" es el término genérico que describe los derechos legales de un empleado para.405.3960 · FA X : 301.314.9294 Su Derecho a Saber Department of Environmental Safety Division of Administrative Derecho a Saber" a través del correo del campus. Este folleto contiene toda la información necesaria para

Rubloff, Gary W.

375

Tempo de Converg^encia para o Equilibrio de Nash nos Jogos Empacotamento de Itens e Balanceamento  

E-print Network

Tempo de Converg^encia para o Equil´ibrio de Nash nos Jogos Empacotamento de Itens e Balanceamento convergência para o equilíbrio de Nash nos jogos empacotamento de itens e balanceamento de carga / André Luís) - Universidade Estadual de Campinas, Instituto de Computação. 1. Teoria dos jogos. 2. Problema de empacotamento

Vignatti, André L.

376

Supported transition metal catalysts for para- to ortho-hydrogen conversion  

NASA Technical Reports Server (NTRS)

The main goal of this study was to develop and improve on existing catalysts for the conversion of ortho- to para-hydrogen. Starting with a commercially available Air Products nickel silicate, which had a beta value of 20, we were trying to synthesize catalysts that would be an improvement to AP. This was accomplished by preparing silicates with various metals as well as different preparation methods. We also prepared supported ruthenium catalysts by various techniques using several metal precursors to improve present technology. What was also found was that the activation conditions prior to catalytic testing was highly important for both the silicates and the supported ruthenium catalysts. While not the initial focus of the research, we made some interesting observations into the adsorption of H2 on ruthenium. This helped us to get a better understanding of how ortho- to para-H2 conversion takes place, and what features in a catalyst are important to optimize activity. Reactor design was the final area in which some interesting conclusions were drawn. As discussed earlier, the reactor catalyst bed must be constructed using straight 1/8 feet OD stainless steel tubing. It was determined that the use of 1/4 feet OD tubing caused two problems. First, the radius from the center of the bed to the wall was too great for thermal equilibrium. Since the reaction of ortho- to para-H2 is exothermic, the catalyst bed center was warmer than the edges. Second, the catalyst bed was too shallow using a 1/4 feet tube. This caused reactant blow-by which was thought to decrease the measured activity when the flow rate was increased. The 1/8 feet tube corrected both of these concerns.

Brooks, Christopher J.; Wang, Wei; Eyman, Darrell P.

1994-01-01

377

A Introdução de Astronomia Básica para Estudantes de 5 e 6 Séries do Ensino Fundamental  

NASA Astrophysics Data System (ADS)

Com intuito de despertar o interesse pelo estudo da astronomia, desenvolveu-se entre 2003 e 2006 no Centro Educacional do Serviço Social da Indústria situado no município de Mauá, São Paulo, um trabalho com duração de 12 meses para turmas de 11 e 12 anos, sendo três turmas por período (2003 / 2004, 2004 / 2005 e 2005 / 2006). O trabalho realizado, objetivando a introdução da astronomia básica com observações de constelações e das fases da Lua, permitindo estender-se a outros corpos celestes, iniciou-se com visita ao planetário Mundo Estelar, localizado no Ipiranga, São Paulo levantou-se a questão da importância do estudo da astronomia e foi lançado aos estudantes um trabalho de observação, com a proposta de localizar as constelações e compreender as fases da Lua, para o registro de tais observações, foram distribuídos mapas celestes, pastas, planilhas de anotações com lacunas para, constelações, fases da Lua e relatos, onde os estudantes acrescentaram pesquisas e relatórios. Os resultados dos 346 estudantes foram que 86,7% (300) concluíram a etapa de observação, destes 300 estudantes 43,3% (130) pesquisaram sobre as constelações e 19,0% (57) localizaram até quatro constelações. Dos 346 estudantes, 44,2% (153) registraram as fases da Lua equivocadamente e 10,4% (36) anexaram reportagens sobre astronomia. Conclui-se que os estudantes se dividiram em pesquisadores, sendo os estudantes que registraram e anexaram informações e, os observadores que preencheram as planilhas de observações, além de desenvolverem habilidades e competências relacionadas ao estudo da astronomia.

Gonzaga, E. P.; Voelzke, M. R.

2008-09-01

378

Haze, Methane And Para-hydrogen Distributions On Uranus And Neptune  

NASA Astrophysics Data System (ADS)

The distribution of aerosols, methane, and molecular hydrogen-para fraction on Uranus and Neptune are investigated from spatially resolved near-IR spectra. For reasons not yet understood, Neptune is one of the most meteorologically active planets in the solar system. Uranus, which appeared relatively featureless in Voyager 2 images, has shown increased activity in recent years [1], presumably revealing seasonal changes. The advent of the HST and adaptive optics technology has allowed researchers to map clouds and retrieve chemical abundances [2,3], providing clues to the dynamics driving these worlds. For this study, latitude resolved H- and K-band spectra and images were obtained using adaptive optics on the 200” Hale telescope at the Palomar Observatory. Data was acquired nearly annually from 1999 to 2007, with several longitudes covered each year. We use an objective, systematic retrieval algorithm (using singular value decomposition) to minimize differences between observed and modeled spectra. Best fitting vertical profiles of aerosol and methane abundance are retrieved, along with the molecular hydrogen para-fraction. Most observations suggest two layers of aerosols, with a stratospheric depletion of methane, and roughly equilibrium para-fractions, each varying with latitude. These parameters are tracers of atmospheric motions and can provide insight into the atmospheric circulations. Variations in latitude suggest regions of stronger upwelling while temporal changes suggest seasonal change. This project was funded under the NASA Outer Planets Research program. [1] Rages, K.A., H.B. Hammel and A.J. Friedson, 2004. Evidence for temporal change at Uranus’ south pole. Icarus, 172, 548-554. [2] Sromovsky, L.A. and P.M.Fry, 2008. The methane abundance and structure of Uranus’ cloud bands inferred from spatially resolved 2006 Keck grism spectra. Icarus, 193, 252-266 [3] Karkoschka, E., 2011. Neptune’s cloud and haze variations 1994-2008 from 500 HST-WFPC2 images. Icarus 215. 759-773.

Roman, Michael; Banfield, D.; Gierasch, P. J.; Stam, D. M.

2012-10-01

379

Self-assembled monolayers of benzylmercaptan and para-cyanobenzylmercaptan on gold: surface infrared spectroscopic characterization.  

PubMed

Self-assembled monolayers (SAMs) on gold substrates were prepared from benzylmercaptan (BM) and para-cyanobenzylmercaptan (pCBM), and the resulting surfaces were investigated using conventional infrared reflection-absorption spectroscopy (IRRAS) as well as polarization modulation infrared reflection-absorption spectroscopy (PM-IRRAS). IRRAS data are analyzed by comparison with transmission IR spectra and theoretical (DFT) simulations. The spectroscopic results indicate the presence of well-ordered monolayers of BM and pCBM with an orientation perpendicular to the surface. IRRAS and PM-IRRAS data are compared to each other and the respective merits of both methods are discussed. PMID:20407711

Rajalingam, K; Hallmann, L; Strunskus, T; Bashir, A; Wöll, C; Tuczek, F

2010-05-01

380

Experimental and theoretical investigation of 5-para-nitro-benzylidene-thiazolidine-2-thione-4-one molecule  

Microsoft Academic Search

Experimental methods (FT-IR, Raman and NMR spectroscopies, and X-ray diffraction technique) coupled with quantum chemical calculations based on density functional theory (DFT) are used for structural and electronic characterization of 5-para-nitro-benzylidene-thiazolidine-2-thione-4-one (5pN-BTT).X-ray diffraction technique indicates that this compound crystallizes with one tetrahydrofuran (THF) solvent molecule, forming a 1:1 5pN-BTT·THF complex, in the monoclinic space group C2\\/c, with Z=8 and cell

Adrian Pîrnau; Vasile Chis; Laszlo Szabo; Onuc Cozar; Mihai Vasilescu; Ovidiu Oniga; Richard A. Varga

2009-01-01

381

Um Framework para Proviso de QoS em Redes Mveis Sem Fio1  

E-print Network

Um Framework para Provisão de QoS em Redes Móveis Sem Fio1 Luciana dos Santos Lima, Antônio Tadeu A provisão de QoS em redes móveis sem fio integrando soluções isoladas encontradas na literatura. Esses descrita através de um cenário simulado em que serviços integrados são oferecidos sobre uma rede IP Móvel

Colcher, Sérgio

382

Un diverticule géant para urétéral chez l’enfant révélé par une masse pelvienne  

PubMed Central

Résumé Nous rapportons un cas de diverticule géant para-urétéral chez un enfant de 18 mois, du point de vue des aspects cliniques, diagnostiques et thérapeutiques. Aucune anomalie associée n’a été relevée. Le patient était un enfant de sexe masculin, et la symptomatologie était dominée par la rétention aiguë d’urine et la présence d’une infection urinaire. La chirurgie a consisté en une diverticulectomie laparoscopique avec réimplantation urétéro-vésicale. L’évolution a été favorable avec disparition des signes urinaires. PMID:24940473

Kassogué, Amadou; Diarra, Alkadri; Benzekri, Younes; Doumbia, Aliou; Bouabdallah, Youssef; Traoré, Zacharia; Tizniti, Siham; Mellas, Soufiane; Tazi, Mohammed Fald; Ammari, Jalal Eddine El; Khallouk, Abdelhak; Fassi, Mohammed Jamal El; Farih, My Hassan

2014-01-01

383

Requisitos Generales (Vigencia: desde Febrero de 2009) Ayuda Econmica para Trabajos Finales de Grado  

E-print Network

clase económica (si aplica). En caso de Pasantías dentro de Venezuela, el monto de la ayuda económica) días, a razón de 4 UT por día. La ayuda económica para eventos dentro de Venezuela (Pasantías y caso de Pasantías fuera de Venezuela, el monto de la ayuda económica cubrirá el costo del boleto aéreo

Vásquez, Carlos

384

A para-nitrophenol phosphonate probe labels distinct serine hydrolases of Arabidopsis.  

PubMed

Activity-based protein profiling represents a powerful methodology to probe the activity state of enzymes under various physiological conditions. Here we present the development of a para-nitrophenol phosphonate activity-based probe with structural similarities to the potent agrochemical paraoxon. We demonstrate that this probes labels distinct serine hydrolases with the carboxylesterase CXE12 as the predominant target in Arabidopsis thaliana. The designed probe features a distinct labeling pattern and therefore represents a promising chemical tool to investigate physiological roles of selected serine hydrolases such as CXE12 in plant biology. PMID:21763150

Nickel, Sabrina; Kaschani, Farnusch; Colby, Tom; van der Hoorn, Renier A L; Kaiser, Markus

2012-01-15

385

ortho-, meta-, and para-Dihydroindenofluorene Derivatives as Host Materials for Phosphorescent OLEDs.  

PubMed

This work reports the first structure-properties relationship study of ortho [2,1-c]-, meta [1,2-a]-, and para [1,2-b]dihydroindenofluorenes, highlighting the influence of bridge rigidification on the electronic properties. This study has made it possible to devise an extended ?-conjugated molecule with both a high triplet state energy level and excellent thermal and morphological stability. As a proof of concept, dihydroindenofluorenes were used as the host in sky-blue phosphorescent organic light-emitting diodes (PhOLEDs) with high performance. PMID:25469476

Romain, Maxime; Thiery, Sébastien; Shirinskaya, Anna; Declairieux, Céline; Tondelier, Denis; Geffroy, Bernard; Jeannin, Olivier; Rault-Berthelot, Joëlle; Métivier, Rémi; Poriel, Cyril

2015-01-19

386

Selective infrared photodissociation of protonated para-fluorophenol isomers: Substitution effects in oxonium and fluoronium ions  

NASA Astrophysics Data System (ADS)

Isomer-selective infrared photodissociation (IRPD) spectra are obtained for the first time for protonated polyfunctional aromatic molecules isolated in the gas phase. IRPD spectra of the oxonium and fluoronium isomers of protonated para-fluorophenol (C6H6FO+) were separately obtained by monitoring resonant photo-induced H2O and HF loss, respectively. Analysis of the F-H, O-H, and C-H stretch wave numbers provides valuable spectroscopic information on the chemical properties of these reactive intermediates, in particular on the substitution effects of functional groups.

Solcà, Nicola; Dopfer, Otto

2004-07-01

387

Selective infrared photodissociation of protonated para-fluorophenol isomers: substitution effects in oxonium and fluoronium ions.  

PubMed

Isomer-selective infrared photodissociation (IRPD) spectra are obtained for the first time for protonated polyfunctional aromatic molecules isolated in the gas phase. IRPD spectra of the oxonium and fluoronium isomers of protonated para-fluorophenol (C6H6FO+) were separately obtained by monitoring resonant photo-induced H2O and HF loss, respectively. Analysis of the F-H, O-H, and C-H stretch wave numbers provides valuable spectroscopic information on the chemical properties of these reactive intermediates, in particular on the substitution effects of functional groups. PMID:15260603

Solca, Nicola; Dopfer, Otto

2004-07-01

388

Electrically conducting poly(para-phenylene sulfide) prepared by doping with nitrosyl salts from solution  

NASA Astrophysics Data System (ADS)

Para(polyphenylene sulfide) may be doped spontaneously and rapidly with nitrosyl salts (NOPF6, NOSbF6) from solution to yield an electrically conducting material (10-1ohm-1cm-1). The level of conductivity is primarily dependent on the extent of dopant incorporation, which in turn is determined by the polymer’s crystallinity; the more amorphous the polymer, the more dopant it takes up and the more conductive it becomes. The incorporation of dopants produces irreversible chemical changes in the polymer resulting in the deterioration of its mechanical properties.

Rubner, Michael; Cukor, Peter; Jopson, Harriet; Deits, Walter

1982-03-01

389

The Ortho:Para Ratio of H3+ in Diffuse Molecular Clouds  

NASA Astrophysics Data System (ADS)

Since its first interstellar detection in the mid 1990s, H3+ has proved to be a powerful probe of astrophysical conditions. In cold molecular clouds, only the lowest two rotational energy levels of H3+ are populated: the (J,K) = (1,1) para state and the (1,0) ortho state. The relative populations of these levels can be used to calculate an excitation temperature, Tex. In dense molecular clouds, Tex agrees well with the estimated cloud kinetic temperature. However, in diffuse molecular clouds, Tex is found to be 30 K, while the kinetic temperature, as determined from the excitation temperature T01 (given by the relative populations of the J = 0 and J = 1 rotational levels of H2) is on average 60-70 K in these environments. Because the (1,1) state of H3+ is the lower-energy state, this indicates that there is more para-H3+ in diffuse molecular clouds than would be expected based on the cloud kinetic temperature. To understand the excess para-H3+ (or the lower-than-expected Tex), we have constructed a chemical model that takes into account the nuclear spin dependence of H3+ formation, proton scrambling via collisions with H2, and dissociative recombination with electrons. At the heart of this model is the reaction H3+ + H2 ? H2 + H3+ , which can proceed by one of three pathways: the identity, proton hop, and hydrogen exchange. The branching fractions for the three pathways, Sid, Shop, and Sexch, influence the nature and extent of the proton scrambling. We use the microcanonical statistical model of Park and Light (J. Chem. Phys. 126, 044305, 1997) to calculate nuclear-spin-dependent rate coefficients that describe the extent of proton scrambling as a function of temperature and the aforementioned branching fractions. As a result, our model predicts, based on these parameters, what the observed Tex should be for a certain cloud kinetic temperature. Our model suggests that on its own, the H3+ + H2 reaction would effectively thermalize the ortho:para H3+ ratio (i.e., Tex = T01). However, dissociative recombination is taken into account, this thermalization is incomplete, and the resultant competition between thermalization and dissociative recombination seems to reproduce the astronomical observations for Sid ~ 0.8-0.9. However, the details of the spin-dependence of H3+ dissociative recombination are important, and at present, experimentally uncertain. More information about this process is needed to determine the validity of our modeling results.

Crabtree, Kyle N.; Indriolo, Nick; Kreckel, Holder; Tom, Brian A.; McCall, Benjamin J.

2010-11-01

390

On linear differential equations with variable coefficients involving a para-Grassmann variable  

NASA Astrophysics Data System (ADS)

Linear differential equations with constant coefficients involving a para-Grassmann variable have been considered recently in the work of Mansour and Schork [Symmetry, Integr. Geom.: Methods Appl. 5, 73 (2009)]. In the present paper, this treatment is extended to linear differential equations with variable coefficients. For the equation of first order, an explicit formula for the solution is given. For the equations of higher order, it is shown how the solutions may be determined in terms of the solutions of "ordinary" differential equations (i.e., involving only "bosonic" variables). Some examples of these differential equations are discussed and analogs for the trigonometric functions are introduced.

Mansour, Toufik; Schork, Matthias

2010-04-01

391

TAgentsP y PDP: propuestas para una plataforma de agentes en computacion ubicua  

Microsoft Academic Search

ser, presenta entornos saturados de dispositivos con capaci-dades de computaci'on y comunicaci'on que le proporcionan a los usuarios servicios ocultando la complejidad tecnol'ogi-ca subyacente. Nuestra l'inea de investigaci'on pretende po-tenciar el uso de la tecnolog'ia de agentes m'oviles en com-putaci'on ubicua para facilitar este objetivo. El trabajo que aqu'i presentamos se centra por un lado en proporcionar una plataforma de

Ma Celeste; Campo Vazquez; Carlos Garc; Florina Almenares; Mendoza Andres; Mar ´ in Lopez

392

Ortho-to-para ratio in interstellar water on the sightline toward Sagittarius B2(N).  

PubMed

The determination of the water ortho-to-para ratio (OPR) is of great interest for studies of the formation and thermal history of water ices in the interstellar medium and protoplanetary disk environments. We present new Herschel observations of the fundamental rotational transitions of ortho- and para-water on the sightline toward Sagittarius B2(N), which allow improved estimates of the measurement uncertainties due to instrumental effects and assumptions about the excitation of water molecules. These new measurements, suggesting a spin temperature of 24-32 K, confirm the earlier findings of an OPR below the high-temperature value on the nearby sightline toward Sagittarius B2(M). The exact implications of the low OPR in the galactic center molecular gas remain unclear and will greatly benefit from future laboratory measurements involving water freeze-out and evaporation processes under low-temperature conditions, similar to those present in the galactic interstellar medium. Given the specific conditions in the central region of the Milky Way, akin to those encountered in active Galactic nuclei, gas-phase processes under the influence of strong X-ray and cosmic ray ionization also have to be carefully considered. We summarize some of the latest laboratory measurements and their implications here. PMID:23656468

Lis, Dariusz C; Bergin, Edwin A; Schilke, Peter; van Dishoeck, Ewine F

2013-10-01

393

O-Methylation of Chlorinated para-Hydroquinones by Rhodococcus chlorophenolicus  

PubMed Central

Rhodococcus chlorophenolicus PCP-I, a degrader of polychlorinated phenols, guaiacols (2-methoxyphenols), and syringols (2,6-dimethoxyphenols), was shown to O-methylate the degradation intermediate, a chlorinated para-hydroquinone, into 4-methoxyphenol. O-methylation was constitutively expressed, whereas the degradation of chlorophenols and chlorohydroquinones was inducible in R. chlorophenolicus. The O-methylating reaction required two hydroxyl groups in positions para to each other. R. chlorophenolicus selectively methylated the hydroxyl group flanked by two chlorine substituents. Tetrachlorohydroquinone, trichlorohydroquinone, and 2,6-dichlorohydroquinone were methylated into tetrachloro-4-methoxyphenol, 2,3,5-trichloro-4-methoxyphenol, and 3,5-dichloro-4-methoxyphenol, respectively. Chlorohydroquinones with only one chlorine adjacent to a hydroxyl group were methylated only in trace amounts, and no metabolite was formed from hydroquinone. The degradation intermediates formed in hydroxylation of tetrachloroguaiacol and trichlorosyringol by R. chlorophenolicus were O-methylated into two isomeric trichlorodimethoxyphenols and two isomeric dichlorotrimethoxyphenols, respectively. R. chlorophenolicus also degraded the polychlorinated methylation products (tetrachlorinated and trichlorinated 4-methoxyphenols), but not mono- and dichlorinated 4-methoxyphenols. PMID:16347691

Häggblom, Max M.; Apajalahti, Juha H. A.; Salkinoja-Salonen, Mirja S.

1988-01-01

394

Transformando la Representación de los Datos para Mejorar el Clasificador Bayesiano Simple  

E-print Network

Abstract. El clasificador bayesiano simple se basa en la asunción de independencia entre los valores de los atributos dado el valor de la clase. Así pues, su efectividad puede decrecer en presencia de atributos interdependientes. En este artículo se presenta DGW (Dependency Guided Wrapper), un wrapper que utiliza la información acerca de las dependencias entre atributos para transformar la representación de los datos para mejorar la precisión del clasificador bayesiano simple. Este artículo presenta una serie de experimentos donde se compara las representaciones de datos obtenidas por el DGW contra las representaciones de datos obtenidas por 12 acercamientos previos, como son la construcción inductiva de productos cartesianos de atributos, y wrappers que realizan búsquedas de subconjuntos óptimos de atributos. Los resultados de los experimentos muestran que DGW genera representaciones nuevas de los datos que ayudan a mejorar significativamente la precisión del clasificador bayesiano simple más frecuentemente que cualquier otro acercamiento previo. Además, DGW es mucho más rápido que cualquier otro sistema en el proceso de transformación de la representación de los datos.

Jose Carlos Cortizo; Ignacio Giraldez; Mari Cruz Gaya; Selección De Atributos

395

The ortho : para ratio of H3+ in laboratory and astrophysical plasmas.  

PubMed

In diffuse molecular clouds, the nuclear spin temperature of H(3)(+) (approx. 30?K) is much lower than the cloud kinetic temperature (approx. 70?K). To understand this temperature discrepancy, we have measured the ratio of the hop to exchange pathways (?) in the H(3)(+) + H(2) --> H(2) + H(3)(+) reaction (which interconverts ortho- and para-H(3)(+)) using high-resolution spectroscopy of the ?(2) fundamental band of H(3)(+) in a hydrogenic plasma. We find that ? decreases from 1.6±0.1 at 350?K to its statistical value of 0.5±0.1 at 135?K. We use this result to model the steady-state chemistry of diffuse molecular clouds, finding good agreement with astronomical data provided the dissociative recombination rates of ortho- and para-H(3)(+) are equal and the identity branching fraction for the H(3)(+) + H(2) reaction is large. Our results highlight the need for further studies of the H(3)(+) + H(2) reaction as well as state-selective measurements of H(3)(+) dissociative recombination. PMID:23028153

Crabtree, Kyle N; McCall, Benjamin J

2012-11-13

396

Comportamiento Sexual y Autoeficacia para la Negociación de Sexo Más Seguro en Personas Heterosexuales  

PubMed Central

La autoeficacia se le ha identificado como uno de los factores que puede facilitar o dificultar llevar a cabo sexo más seguro. Estudios revelan que las personas que están el relaciones estables usan métodos de protección menos frecuente que quienes tienen parejas casuales. Realizamos un estudio con 447 personas heterosexuales activas sexualmente. Les administramos un cuestionario dirigido a medir el comportamiento sexual, el uso del condón masculino y la práctica de la masturbación mutua, y la autoeficacia para llevar a cabo estas conductas. Los resultados reflejan que los hombres están más activos sexualmente y que el uso del condón y la práctica de la masturbación mutua como alternativa de sexo más seguro es muy baja. En los casos donde se usa el condón esta práctica es realizada en su mayoría por las personas que se encuentran en una relación de pareja casual. No obstante, los/las participantes tienen altos niveles de autoeficacia hacia ambas prácticas. Aunque la autoeficacia es uno de los factores que incide en decidir llevar a cabo sexo más seguro, ésta no es suficiente para que esta meta se logre. PMID:22837585

Pérez-Jiménez, David; Santiago-Rivas, Marimer; Serrano-García, Irma

2012-01-01

397

Effects of acoustic feedback training in elite-standard Para-Rowing.  

PubMed

Abstract Assessment and feedback devices have been regularly used in technique training in high-performance sports. Biomechanical analysis is mainly visually based and so can exclude athletes with visual impairments. The aim of this study was to examine the effects of auditory feedback on mean boat speed during on-water training of visually impaired athletes. The German National Para-Rowing team (six athletes, mean  ± s, age 34.8 ± 10.6 years, body mass 76.5 ± 13.5 kg, stature 179.3 ± 8.6 cm) participated in the study. Kinematics included boat acceleration and distance travelled, collected with Sofirow at two intensities of training. The boat acceleration-time traces were converted online into acoustic feedback and presented via speakers during rowing (sections with and without alternately). Repeated-measures within-participant factorial ANOVA showed greater boat speed with acoustic feedback than baseline (0.08 ± 0.01 m·s(-1)). The time structure of rowing cycles was improved (extended time of positive acceleration). Questioning of athletes showed acoustic feedback to be a supportive training aid as it provided important functional information about the boat motion independent of vision. It gave access for visually impaired athletes to biomechanical analysis via auditory information. The concept for adaptive athletes has been successfully integrated into the preparation for the Para-Rowing World Championships and Paralympics. PMID:25105858

Schaffert, Nina; Mattes, Klaus

2015-02-01

398

The new ParaDIgm: IgM from bench to clinic  

PubMed Central

The inaugural IgM event entitled “The new ParaDIgm: IgM from bench to clinic” brought together the increasingly active and growing IgM antibody community to discuss recent advances and challenges facing the discovery and development of IgM antibody therapies and technologies. Researchers, clinicians and biomanufacturing experts delivered 21 talks on the basic science and isolation of IgM, upstream and downstream development, and formulation and clinical development of the molecules. Participants networked around topics aimed at exploring the full potential of IgM antibodies. The meeting was held at DECHEMA Gesellschaft für Chemische Technik und Biotechnologie e. V. (Society for Chemical Engineering and Biotechnology), a non-profit scientific and technical society based in Frankfurt am Main, Germany. The meeting was sponsored by Patrys, Laureate Biopharma, Bio-Rad Laboratories, BIA Separations, Percivia and the Bio Affinity Company (BAC). The second New ParaDIgm: IgM from bench to clinic meeting, will be held on April 23–24, 2013 in Frankfurt, Germany. PMID:22864407

Hanala, Sherif

2012-01-01

399

Clinical aspects of para-tertiary-butylphenolformaldehyde resin (PTBP-FR) allergy.  

PubMed

Sensitization by para-tertiary-butylphenolformaldehyde resin (PTBP-FR), which is particularly useful as a leather glue, has been known for 30 years. We retrospectively studied the clinical aspects of those patients with a PTBP-FR allergy among 1966 patients in whom contact dermatitis was confirmed by patch testing. A positive patch test to PTBP-FR was present in 30 patients (1.5%), 24 of whom were women. Exposure to PTBP-FR as a cause of the dermatitis was "certain" in 7, "very likely" in 6 and "unclear" in 17. 67.7% of the patients had a multiple allergy. In 43.3% of the patients, a history of atopy was found. No clear association of PTBP-FR sensitization with allergies to phenolformaldehyde resin (P-FR) or free para-tertiary-butylphenol (PTBP) emerged in this group of 30 patients. This study supports the hypothesis that PTBP-FR and P-FR do not contain the same sensitizers. Follow-up of 26 of the 30 patients showed a favourable course, dependent on identification of the source of exposure, avoidance of further contact and absence of sensitization to multiple allergens. PMID:2533533

Geldof, B A; Roesyanto, I D; van Joost, T

1989-11-01

400

PFI-ZEKE (Pulsed Field Ionization-Zero Electron Kinetic Energy) para el estudio de iones  

NASA Astrophysics Data System (ADS)

Entre las áreas hacia donde ha evolucionado la Química en los últimos años están los estudios de sistemas con especies reactivas de alta energía y los dominados por fuerzas intermoleculares débiles, con energías de unas pocas kcal/mol. En efecto, el estudio de las propiedades de los iones, comenzando por su relación con la molécula neutra de la que procede, la energía de ionización, los estados vibracionales y rotacionales, energías de enlace de Van der Waals entre el ión y una amplia variedad de otras moléculas, sus confórmeros o isómeros y sus reacciones o semi-reacciones químicas están en la raíz de la necesidad de la espectroscopía conocida como PFI-ZEKE, Pulsed Field Ionization-Zero Electron Kinetic Energy. Entre las aplicaciones que requieren estos conocimientos se encuentran la generación de plasmas para la fabricación de semiconductores, memorias magnéticas, etc, así como los sistemas astrofísicos, la ionosfera terrestre, etc. La espectroscopía ZEKE es una evolución de las de fluorescencia inducida por láser, LIF, ionización multifotónica acrecentada por resonancia, REMPI, con uno y dos colores y acoplada a un sistema de tiempo de vuelo, REMPI-TOF-MS, y las espectroscopías de doble resonancia IR-UV y UV-UV. Sus espectros y la ayuda de cálculos ab inicio permite determinar las energías de enlace de complejos de van der Waals en estados fundamental y excitados, identificar confórmeros e isómeros, obtener energías de ionización experimentales aproximadas (100 cm-1) y otras variables de interés. Al igual que con LIF, REMPI y dobles resonancias, es posible utilizar muestras gaseosas, pero los espectros están muy saturados de bandas y su interpretación es difícil o imposible. Se evitan estas dificultades estudiando las moléculas o complejos en expansiones supersónicas, donde la T de los grados de libertad solo alcanzan unos pocos K. Para realizar experimentos de ZEKE hay que utilizar una propiedad recientemente descubierta, que va en contra de lo esperado en otros sistemas físicos y que consiste en que los altos estados Rydberg de átomos, moléculas y sus complejos de van der Waals (o de los iones) tienen tiempos de vida de centenas de ? s. En resumen, el experimento y la espectroscopía ZEKE consiste en excitar un átomo, molécula o cluster sucesivamente a dos estados excitados selectivos de manera que el final sea un estado Rydberg. A continuación se aplica un campo eléctrico variable que lo ioniza y después de un cierto retraso se aplica un campo eléctrico de extracción, tanto para el electrón como para el ión. El espectro de los iones, es un espectro ZEKE. Hay varias alternativas para hacer este último proceso. El estudio de la espectroscopía y propiedades de iones y sus clusters requiere el conocimiento detallado de la espectroscopía de la molécula neutra, los estados Rydberg, de los confórmeros y sus complejos. Todo ello implica el haber estudiado los sistemas por LIF, REMPI y doble resonancia (hole burning IR-UV, UV-UV). Además solo es posible interpretar los resultados y obtener la información contenida en los espectros con ayuda de cálculos cuánticos ab initio. Hasta el momento hemos aplicado tanto el ZEKE como el conjunto de técnicas mencionadas anteriormente, a varias molécula de interés químico general como anilina y sus derivados, así como sus complejos con agua y amoniaco. Sin embargo, el método es muy versátil y puede aplicarse a iones de átomos, iones múltiples, moléculas sencillas y sus clusters así como a sus semi-reacciones. Como ejemplo de uno de estos espectros PFI-ZEKE se presenta aquí el caso del amonibenzonitrilo, ABN y solamente en su estado fundamental. En la conferencia se presentarán espectros ZEKE del ABN y moléculas similares en estados vibracionales intermedios (islas de estabilidad), así como la determinación de potenciales de ionización precisos, energías de enlace de compuestos del ión con varios disolventes y otras propiedades de interés, discutiendo sus resultados.

Castaño, F.; Fernández, J. A.; Basterretxea, A. Longarte. F.; Sánchez Rayo, M. N.; Martínez, R.

401

ParaHox gene expression in larval and postlarval development of the polychaete Nereis virens (Annelida, Lophotrochozoa)  

PubMed Central

Background Transcription factors that encode ANTP-class homeobox genes play crucial roles in determining the body plan organization and specification of different organs and tissues in bilaterian animals. The three-gene ParaHox family descends from an ancestral gene cluster that existed before the evolution of the Bilateria. All three ParaHox genes are reported from deuterostomes and lophotrochozoans, but not to date from any ecdysozoan taxa, and there is evidence that the ParaHox genes, like the related Hox genes, were ancestrally a single chromosomal cluster. However, unlike the Hox genes, there is as yet no strong evidence that the ParaHox genes are expressed in spatial and temporal order during embryogenesis. Results We isolated fragments of the three Nereis virens ParaHox genes, then used these as probes for whole-mount in situ hybridization in larval and postlarval worms. In Nereis virens the ParaHox genes participate in antero-posterior patterning of ectodermal and endodermal regions of the digestive tract and are expressed in some cells in the segment ganglia. The expression of these genes occurs in larval development in accordance with the position of these cells along the main body axis and in postlarval development in accordance with the position of cells in ganglia along the antero-posterior axis of each segment. In none of these tissues does expression of the three ParaHox genes follow the rule of temporal collinearity. Conclusion In Nereis virens the ParaHox genes are expressed during antero-posterior patterning of the digestive system (ectodermal foregut and hindgut, and endodermal midgut) of Nereis virens. These genes are also expressed during axial specification of ventral neuroectodermal cell domains, where the expression domains of each gene are re-iterated in each neuromere except for the first parapodial segment. These expression domains are probably predetermined and may be directed on the antero-posterior axis by the Hox genes, whose expression starts much earlier during embryogenesis. Our results support the hypothesis that the ParaHox genes are involved in antero-posterior patterning of the developing embryo, but they do not support the notion that these genes function only in the patterning of endodermal tissues. PMID:18510732

Kulakova, Milana A; Cook, Charles E; Andreeva, Tatiana F

2008-01-01

402

Compilação de dados atômicos e moleculares do UV ao IV próximo para uso em síntese espectral  

NASA Astrophysics Data System (ADS)

Espectros sintéticos são utéis em uma grande variedade de aplicações, desde análise de abundâncias em espectros estelares de alta resolução ao estudo de populações estelares em espectros integrados. A confiabilidade de um espectro sintético depende do modelo de atmosfera adotado, do código de formação de linhas e da qualidade dos dados atômicos e moleculares que são determinantes no cálculo das opacidades da fotosfera. O nosso grupo no departamento de Astronomia no IAG tem utilizado espectros sintéticos há mais de 15 anos, em aplicações voltadas principalmente para a análise de abundâncias de estrelas G, K e M e populações estelares velhas. Ao longo desse tempo, as listas de linhas vieram sendo construídas e atualizadas continuamente, e alguns acréscimos recentes podem ser citados: Castilho (1999, átomos e moléculas no UV), Schiavon (1998, bandas moleculares de TiO) e Melendez (2001, átomos e moléculas no IV próximo). Com o intuito de calcular uma grade de espectros do UV ao IV próximo para uso no estudo de populações estelares velhas, se fazia necessário compilar e homogeneizar as diversas listas em apenas uma lista atômica e uma molecular. Nesse processo, a nova lista compilada foi correlacionada com outras bases de dados (NIST, Kurucz Database, O' Brian et al. 1991) para atualização dos parâmetros que caracterizam a transição atômica (comprimento de onda, log gf e potencial de excitação). Adicionalmente as constantes de interação C6 foram calculadas segundo a teoria de Anstee & O'Mara (1995) e artigos posteriores. As bandas moleculares de CH e CN foram recalculadas com o programa LIFBASE (Luque & Crosley 1999). Nesse poster estão detalhados os procedimentos citados acima, as comparações entre espectros calculados com as novas listas e espectros observados em alta resolução do Sol e de Arcturus, e uma análise do impacto decorrente da utilização de diferentes modelos de atmosfera no espectro sintético. Ao final, temos uma lista de linhas atômicas com mais de 24.000 linhas e uma lista molecular com as moléculas CN, CH, OH, NH, MgH, C2, TiO Gama, CO, FeH, adequadas ao estudo de estrelas G, K e M e populações estelares velhas.

Coelho, P.; Barbuy, B.; Melendez, J.; Allen, D. M.; Castilho, B.

2003-08-01

403

Observation of crystallization slowdown in supercooled para-hydrogen and ortho-deuterium quantum liquid mixtures  

E-print Network

We report a quantitative experimental study of the crystallization kinetics of supercooled quantum liquid mixtures of para-hydrogen (pH$_2$) and ortho-deuterium (oD$_2$) by high spatial resolution Raman spectroscopy of liquid microjets. We show that in a wide range of compositions the crystallization rate of the isotopic mixtures is significantly reduced with respect to that of the pure substances. To clarify this behavior we have performed path-integral simulations of the non-equilibrium pH$_2$-oD$_2$ liquid mixtures, revealing that differences in quantum delocalization between the two isotopic species translate into different effective particle sizes. Our results provide first experimental evidence for crystallization slowdown of quantum origin, offering a benchmark for theoretical studies of quantum behavior in supercooled liquids.

Matthias Kühnel; José M. Fernández; Filippo Tramonto; Guzmán Tejeda; Elena Moreno; Anton Kalinin; Marco Nava; Davide E. Galli; Salvador Montero; Robert E. Grisenti

2014-10-10

404

Development of a para-orthohydrogen catalytic converter for a solid hydrogen cooler  

NASA Technical Reports Server (NTRS)

Design features of a tested catalytic converter for altering vented cryogenic parahydrogen used as a coolant on spacecraft into a para-ortho equilibrium for channeling to other cooling functions are described. The hydrogen is expected to be stored in either liquid or solid form. A high surface area Ni-on-Si catalyst was selected for tests at an operating pressure of 2 torr at a ratio of 1000 gr catalyst for a gr/sec hydrogen flow. Cylindrical and radial flow geometries were tried and measurements centered on the converter efficiencies at different operating temperatures when the converter was placed in the vent line of the H2 cooler. Efficiencies ranging from 10-100 percent were obtained for varying flow rates. Further testing is necessary to characterize the converter performance under a wider range of operating temperatures and environments.

Nast, T. C.; Hsu, I. C.

1984-01-01

405

Genomic organization of Hox and ParaHox clusters in the echinoderm, Acanthaster planci.  

PubMed

The organization of echinoderm Hox clusters is of interest due to the role that Hox genes play in deuterostome development and body plan organization, and the unique gene order of the Hox complex in the sea urchin Strongylocentrotus purpuratus, which has been linked to the unique development of the axial region. Here, it has been reported that the Hox and ParaHox clusters of Acanthaster planci, a corallivorous starfish found in the Pacific and Indian oceans, generally resembles the chordate and hemichordate clusters. The A. planci Hox cluster shared with sea urchins the loss of one of the medial Hox genes, even-skipped (Evx) at the anterior of the cluster, as well as organization of the posterior Hox genes. genesis 52:952-958, 2014. © 2014 Wiley Periodicals, Inc. PMID:25394327

Baughman, Kenneth W; McDougall, Carmel; Cummins, Scott F; Hall, Mike; Degnan, Bernard M; Satoh, Nori; Shoguchi, Eiichi

2014-12-01

406

Cholecystocutaneous fistula: an unusual complication of a para-umbilical hernia repair.  

PubMed

This case describes a 94-year-old woman who presented 2?years postsutured para-umbilical hernia repair with a painful black lump protruding through her scar with blood stained discharge. This was initially thought to be either ischaemic bowel secondary to strangulated incisional hernia or a large organised haematoma. An urgent CT scan was performed following which the patient passed two large calculi and bile-stained fluid spontaneously through the wound, making the diagnosis somewhat clearer. The scan revealed an incisional hernia containing the gallbladder and two large calculi at the skin surface and an incidental large caecal cancer with surrounding lymphadenopathy. Frail health and the incidental finding of a colon cancer rendered invasive surgical management inappropriate. Therefore, she was managed conservatively with antibiotics. A catheter was inserted into the fistula tract to allow free drainage and alleviate pressure-related symptoms. The patient was discharged following a multidisciplinary team discussion. PMID:24862413

Dixon, Steven; Sharma, Mitesh; Holtham, Stephen

2014-01-01

407

La Observación Sistemática de Vecindarios: El caso de Chile y sus perspectivas para Trabajo Social  

PubMed Central

El estudio acerca de las características de los vecindarios y sus efectos sobre las personas ha llegado a ser un área de creciente atención por parte de investigadores de diversas disciplinas en países desarrollados. Aunque actualmente existen diversas metodologías para estudiar efectos del vecindario, una de las más utilizadas es la Observación Sistemática de Vecindarios –Systematic Social Observation SSO, en inglés—porque permite recolectar información acerca de diversas características del entorno físico, social, ambiental y económico de los vecindarios donde se aplica. El objetivo de este artículo es (i) dar a conocer sumariamente algunas investigaciones influyentes sobre efectos del vecindario en Estados Unidos, ii) describir cómo se diseñó e implementó la Observación Sistemática de Vecindarios en la ciudad de Santiago de Chile, iii) señalar algunos facilitadores y obstaculizadores de la implementación del proyecto y, finalmente iv) enunciar posibles contribuciones y limitaciones que esta metodología ofrecería al trabajo social en Chile. PMID:24791060

Sanhueza, Guillermo E.; Delva, Jorge; Andrade, Fernando H.; Grogan-Kaylor, Andrew; Bares, Cristina; Castillo, Marcela

2012-01-01

408

Food for Life/Comida para la Vida: Creating a Food Festival to Raise Diabetes Awareness  

PubMed Central

African and Latino Americans have higher rates of diabetes and its complications than White Americans. Identifying people with undiagnosed diabetes and helping them obtain care can help to prevent complications and mortality. To kick off a screening initiative, our community-academic partnership created the “Food for Life Festival,” or “Festival Comida para la Vida.” This article will describe the community’s perspective on the Festival, which was designed to screen residents, and demonstrate that eating healthy can be fun, tasty, and affordable in a community-centered, culturally consonant setting. More than 1,000 residents attended the event; 382 adults were screened for diabetes, and 181 scored as high risk. Fifteen restaurants distributed free samples of healthy versions of their popular dishes. Community residents, restaurateurs, and clinicians commented that the event transformed many of their preconceived ideas about healthy foods and patient care. PMID:20097997

Lancaster, Kristie; Walker, Willie; Vance, Thomas; Kaskel, Phyllis; Arniella, Guedy; Horowitz, Carol

2012-01-01

409

Approaches to Modeling Diffuse Scattering from Molecular Crystals: Para-Terphenyl (C18H14)  

NASA Astrophysics Data System (ADS)

Diffuse scattering is a probe of the local correlations in a crystal, whereas Bragg peaks are descriptive of the average long-range ordering. The long-range average is the result of numerous local configurations the population of which cannot be determined from the Bragg peaks. Diffuse scattering can examine this population. This is particularly the case when making use of the three-dimensional distribution of diffuse scattering from single crystals. However, diffuse scattering is very weak and broad and is often of similar intensity to the experimental background, which makes data collection demanding. Disorder can also take many forms and local configurations are not constrained by the average crystallographic symmetry. Here, three approaches to the modeling of diffuse scattering from molecular crystals will be discussed. All three approaches are based on a Monte Carlo (MC) simulation. As an example, the modeling of neutron diffuse scattering from para-terphenyl ( PTP, C18H14) will be described.

Goossens, D. J.; Welberry, T. R.

2010-05-01

410

Left hepatic vein injury during laparoscopic antireflux surgery for large para-oesophageal hiatus hernia  

PubMed Central

Although the advent of laparoscopic fundoplication has increased both patient and physician acceptance of antireflux surgery, it has become apparent that the laparoscopic approach is associated with an increased risk of some complications and as well as the occurrence of new complications specific to this approach. One such complication occurred in our patient who had intra-operative left hepatic vein injury during laparoscopic floppy Nissen fundoplication for large para-oesophageal rolling hernia. With timely conversion to open procedure, the bleeding was controlled and the antireflux and the procedure were completed uneventfully. However, this suggests that even with an experience in advanced laparoscopy surgery, complications can occur. Clear understanding of the normal and pathologic anatomy and its variations facilitates laparoscopic surgery and should help the surgeon avoid complications. The incidence of some of these complications decreases as surgeons gain experience; however, new complications can arise due to the increase in such procedures. PMID:20040801

Nagpal, Anish P; Soni, Harshad; Haribhakti, Sanjiv P

2009-01-01

411

El Proyecto Sismico "LARSE" - Trabajando Hacia un Futuro con Mas Seguridad para Los Angeles  

USGS Publications Warehouse

La region de Los Angeles contiene una red de fallas activas, incluyendo muchas fallas por empuje que son profundas y no rompen la superficie de la tierra. Estas fallas ocultas incluyen la falla anteriormente desconocida que fue responsable por la devastacion que ocurrio durante el terremoto de Northridge en enero de 1994, el terremoto mas costoso en la historia de los Estados Unidos. El Experimento Sismico en la Region de Los Angeles (Los Angeles Region Seismic Experiment, LARSE), esta localizando los peligros ocultos de los terremotos debajo de la region de Los Angeles para mejorar la construccion de las estructuras que pueden apoyar terremotos que son inevitables en el futuro, y que ayudaran a los cientificos determinar donde occurira el sacudimento mas fuerte y poderoso.

Henyey, Thomas L.; Fuis, Gary S.; Benthien, Mark L.; Burdette, Thomas R.; Christofferson, Shari A.; Clayton, Robert W.; Criley, Edward E.; Davis, Paul M.; Hendley, James W., II; Kohler, Monica D.; Lutter, William J.; McRaney, John K.; Murphy, Janice M.; Okaya, David A.; Ryberg, Trond; Simila, Gerald W.; Stauffer, Peter H.

1999-01-01

412

Salud para su Corazón: a community-based Latino cardiovascular disease prevention and outreach model.  

PubMed

Cardiovascular disease (CVD) is the leading cause of death for Latinos living in the United States. This population is generally unaware of important lifestyle or behavioral changes that can prevent CVD. The National Heart, Lung, and Blood Institute (NHLBI) designed and implemented Salud para su Corazón (Health for Your Heart), a culturally appropriate, community-based, theory-driven intervention model. NHLBI's goals were: (1) to design an intervention model appropriate to Latino populations; (2) to pilot test the model in a specific community with the objectives of increasing awareness about heart disease, raising knowledge about CVD prevention, and promoting heart-healthy lifestyles; and (3) to disseminate the model and the materials developed to other communities with similar needs. An agency-community partnership, under the leadership of the Community Alliance for Heart Health, guided all stages of the community intervention project. The multimedia bilingual community intervention included television telenovela format public service announcements (PSAs), radio programs, brochures, recipe booklets, charlas, a promotores training manual, and motivational videos. An evaluation survey assessed the impact of the intervention. A pre-post intervention survey was conducted with more than 300 participants, and results showed that the respondents were substantially more aware of risk factors for CVD, and had greatly increased their knowledge of ways to prevent heart disease. Dissemination efforts have resulted in numerous requests by health organizations, universities, and health maintenance organizations (HMOs) for educational materials and communication strategies produced by Salud para su Corazón. In addition, Univision, the largest Spanish-language broadcast television network, is airing the initiative's PSAs. Also, training seminars for promotores are being conducted in different regions of the United States, and several locations are planning to replicate this study. PMID:10555925

Alcalay, R; Alvarado, M; Balcazar, H; Newman, E; Huerta, E

1999-10-01

413

PREVENCION DE VIH PARA MUJERES HISPANAS DE 50 AÑOS Y MÁS  

PubMed Central

Introducción Las mujeres Hispanas de 50 años y más (MHC) son una minoría en Estados Unidos que está a elevado riesgo de adquirir VIH y son el grupo menos estudiado en lo que respecta a salud, características sociales y de comportamiento sexual. Objetivo Investigar los factores que incrementan el riesgo de VIH en las MHC con el propósito de desarrollar o adaptar una intervención apropiada para la “edad y la cultura "de este grupo de mujeres. Metodología Estudio descriptivo de corte transversal con una muestra de 50 MHC, sexualmente activas y que residían en Miami, Florida, Estados Unidos. Se utilizó un cuestionario estructurado administrado por entrevistadores entrenados y bilingües (inglés/español). Las participantes fueron reclutadas en diferentes lugares en el Sur de Florida. Para el análisis de los datos se utilizó estadística descriptiva, tanto medidas de tendencia central como medidas de dispersión. Resultados La edad promedio de las MHC fue de 55,7 ± 6 años (rango 50–76 años). Todas las MHC estaban en la menopausia. Prevención del VIH Las MHC reportaron niveles medios de conocimientos sobre VIH y comunicación con la pareja. En la muestra se reportó la presencia de síntomas depresivos, violencia en la pareja, actitudes negativas hacia las personas viviendo con VIH y baja percepción de riesgo de adquirir VIH. Las MHC mencionaron necesidades de aprendizaje en tópicos relacionados con prevención de VIH y cambios de la edad. Conclusión Las MHC están a riesgo de adquirir VIH y tienen necesidades especiales en términos de educación sobre prevención de VIH. PMID:25242862

Villegas, N.; Cianelli, R.; Ferrer, L.; Kaelber, L.; Peragallo, N.; Yaya, Alexandra O.

2012-01-01

414

Evaluation of para-dichlorobenzene emissions from solid moth repellant as a source of indoor air pollution  

SciTech Connect

The paper reports results of dynamic and static chamber tests to evaluate para-dichlorobenzene emission rates from mothcakes. The data were analyzed by a model that assumes that the emission rate is controlled by gas-phase mass transfer. Results indicate that the para-dichlorobenzene emission from mothcakes is a temperature-sensitive sublimation process. Full-scale house tests were also conducted to measure mass transfer coefficients based on the model developed. The values of the mass transfer coefficient obtained are very comparable to those estimated by theoretical heat transfer studies.

Chang, J.C.S.; Krebs, K.A.

1992-01-01

415

A kinetic method for para -nitrophenol determination based on its inhibitory effect on the catalatic reaction of catalase  

Microsoft Academic Search

The inhibitory effect of para-nitrophenol on the catalytic reaction of catalase was investigated. Michaelis-Menten kinetic parameters were determined from\\u000a Lineweaver-Burk plots obtained in the absence or in the presence of the inhibitor. The inhibitor pattern, revealed by the\\u000a Lineweaver-Burk plots, suggested a fully mixed inhibition mechanism. Spectrophotometric monitoring of the indicator reaction:\\u000a $$H_2 O_2 \\\\xrightarrow{{catalase,para - nitrophenol}}H_2 O + \\\\tfrac{1}{2}O_2

Claudia Mure?anu; Lucian Copolovici; Florina Pogùacean

2005-01-01

416

-REDES Y TELECOMUNICACIONES PARA PASES EN DESARROLLO No es previsible que sea necesaria una adaptacin de alumnos del Mster Oficial en  

E-print Network

- REDES Y TELECOMUNICACIONES PARA PAÍSES EN DESARROLLO No es previsible que sea necesaria una adaptación de alumnos del Máster Oficial en Redes de Telecomunicación para Países en Desarrollo hacia el nuevo título de Máster Universitario en Redes de Telecomunicación para Países en Desarrollo. Las razones

Rey Juan Carlos, Universidad

417

Biradical thermochemistry from collision-induced dissociation threshold energy measurements. Absolute heats of formation of ortho-, meta-, and para-benzyne  

Microsoft Academic Search

The absolute heats of formation of 1,2-, 1,3-, and 1,4-dehydrobenzene (ortho, meta-, and para-benzyne) have been determined from measurements of the threshold energies for collision-induced dissociation (CID) of ortho, meta-, and para-chlorophenyl anions in a flowing afterglow-triple quadrupole apparatus. The 298 K heats of formation for ortho-, meta-, and para-benzyne derived in this manner are 106.6 [+-] 3.0, 122.0 [+-

Paul G. Wenthold; Robert R. Squires

1994-01-01

418

Abono para la planta medicinal Cobra fuerza en la Isla el estudio del valor teraputico de la flora tropical.  

E-print Network

que "muchas plantas americanas (como el tabaco, que se preparaba de diferentes maneras), eran de a otros colegas e investigadores de la Escuela de Farmacia. Entre ellos, figuran Ana Vélez, Ricardo pasos para que este logre la acreditación de la Asociación Americana de Museos. Jardín con historia A su

Quirk, Gregory J.

419

A catalytic and tert-butoxide ion-mediated amidation of aldehydes with para-nitro azides.  

PubMed

We report here a new catalytic reaction in which, para-nitro azides are acylated by aldehydes to produce amides and molecular nitrogen in a single step. The transformation is believed to proceed via an electron transfer process mediated by the tert-butoxide ion, and catalysed by a thiazolium salt derived species. PMID:23443044

Carbone, Giorgio; Burnley, James; Moses, John E

2013-04-01

420

TOXICOKINETICS AND STRUCTURE-ACTIVITY RELATIONSHIPS OF NINE PARA-SUBSTITUTED PHENOLS IN RAT EMBRYOS IN VITRO  

EPA Science Inventory

The purpose of this study was to examine the pharmacokinetics of embryo uptake following exposure to a variety of related chemicals in rodent embryo culture. he uptake of nine radiolabeled para-substituted phenols by day 10 (9-13 somite stage) rat embryos in vitro was determined ...

421

Mecanismo de encaminamiento y asignacin de longitud de onda Basado en Prediccin para Redes de Transporte ptico  

E-print Network

Mecanismo de encaminamiento y asignación de longitud de onda Basado en Predicción para Redes de, pareta, jordid} @ac.upc.es Resumen En redes de transporte óptico los algoritmos de encaminamiento y estado de la red. Debido a diferentes factores, en redes altamente dinámicas esta información de estado

Politècnica de Catalunya, Universitat

422

TRANSNACIONALISMO E INCORPORACIÓN LABORAL DE MIGRANTES MEXICANOS EN ESTADOS UNIDOS Y LAS PERSPECTIVAS DE ASCENSO SOCIOECONÓMICO PARA SUS HIJOS  

Microsoft Academic Search

A lo largo de casi todo el siglo XX, en Estados Unidos prevaleció la idea de que los in- migrantes con bajos niveles de capacitación, lógicamente, ocuparían los peldaños más bajos de la escala ocupacional y salarial, pero que, dadas las oportunidades exis- tentes en el país, sus hijos tendrían muchas posibilidades para incorporarse a los estratos medios. A principios

Elaine Levine

423

Malaria: a un paso del fin Para el investigador Quique Bassat hablar de "erradicacin" es posible a largo plazo  

E-print Network

1 Malaria: a un paso del fin Para el investigador Quique Bassat hablar de "erradicación" es posible a largo plazo "Tras un fuerte ataque de malaria la persona se convierte en una piltrafa humana, yace. Según la OMS, la malaria, conocida también como paludismo, afecta cada año a unos 210 millones de

Geffner, Hector

424

Desenvolvimento Computacional para Observaes Astronmicas Remotas Ana Lcia da Silva Beraldo1, Andr de Castro Milone2  

E-print Network

Desenvolvimento Computacional para Observações Astronômicas Remotas Ana Lúcia da Silva Beraldo1 executada tanto em ambiente Linux como Windows. Atualmente, o Sistema está sendo aprimorado por Ana Lúcia e velocidade do vento. Luneta Meade DSI Pro (campo 3,8º x 2,7º). Focalizador automatizado. T

425

EFECTOS DE LA LIBERALIZACIÓN COMERCIAL: UN ANÁLISIS DE EQUILIBRIO PARCIAL PARA EL SECTOR DE ARROZ EN COLOMBIA  

Microsoft Academic Search

Mediante el análisis de cointegración y el modelo de vector de corrección de errores (VEC) se estimó el sistema de ecuaciones de oferta, demanda y precio del arroz blanco para Colombia, en el periodo comprendido entre 1970 – 2004. La demanda estimada muestra los signos esperados y es inelástica con respecto al precio del arroz, al ingreso disponible, al precio

Victor Dulio Chique Acero; Ramón Rosales Álvarez; Henry Samacá Prieto

2006-01-01

426

Theoretical Study of the Mechanism Behind the para-Selective Nitration of Toluene in Zeolite H-Beta  

Microsoft Academic Search

Periodic density functional theory calculations were performed to investigate the origin of the favorable para-selective nitration of toluene exhibited by zeolite H-beta with acetyl nitrate nitration agent. Energy calculations were performed for each of the 32 crystallographically unique Bronsted acid sites of a beta polymorph B zeolite unit cell with multiple Bronsted acid sites of comparable stability. However, one particular

Amity Andersen; Niranjan Govind; Lalitha Subramanian

2011-01-01

427

Theoretical study of the mechanism behind the para-selective nitration of toluene in zeolite H-Beta  

Microsoft Academic Search

Periodic density functional theory calculations were performed to investigate the origin of the favourable para-selective nitration of toluene exhibited by zeolite H-beta with acetyl nitrate nitration agent. Energy calculations were performed for each of the 32 crystallographically unique Brønsted acid sites of a beta polymorph B zeolite unit cell with multiple Brønsted acid sites of comparable stability. However, one particular

Amity Andersen; Niranjan Govind; Lalitha Subramanian

2008-01-01

428

COMERCIO DE FAUNA EN COLOMBIA E INFORMACIÓN OCULTA: NUEVOS RETOS EN LA REGULACIÓN PARA SU USO SOSTENIBLE  

Microsoft Academic Search

Este artículo analiza el problema al que puede enfrentarse la zoocría en la producción y comercialización de fauna bajo ciertas condiciones relacionadas con los costos. Considerando el proceso actual de trámites legales y de regulación, es posible que los zoocriaderistas consideren actuar ilegalmente para mejorar sus beneficios, extrayendo fauna del medio natural y comercializándola como propia, generando mayor presión sobre

Myriam Liliana Rivera Virgüez

2005-01-01

429

INSCRIES PARA O PROCESSO SELETIVO DE INGRESSO AO PROGRAMA DE PS-GRADUAO EM CINCIAS BIOLGICAS (ZOOLOGIA) DO  

E-print Network

estrangeiro] e CPF). Os candidatos ao doutorado que já possuírem título de mestre deverão também entregar por vídeo conferência para candidatos de outras cidades do Brasil e do exterior. Nesse caso, a CCP

Morandini, Andre C.

430

Identificación de oportunidades de mercado y mercadeo con un Enfoque Multi - Cadena para productos agroforestales de Alto Beni, Bolivia  

Microsoft Academic Search

Este estudio procura brindar oportunidades de diversificación a los productores cacaoteros de Alto Beni, Bolivia. Los productores cacaoteros se suman en 800 familias afiliadas a la cooperativa El Ceibo, que ha estado brindando facilidades para el acopio y la agregación de valor al cacao, pero que sin embargo, no ha logrado lanzar otros productos que puedan hacerle frente a variantes

Julio Cesar Muñoz Espinoza

431

Oportunidades, desafíos y barreras de la movilidad laboral en Colombia: reflexiones para la población en pobreza extrema y moderada  

Microsoft Academic Search

En este documento se estudian los flujos y determinantes de la movilidad laboral en Colombia, haciendo énfasis en la población en pobreza extrema y moderada. Con base en la información de las Encuestas de Hogares para los años 1995, 2000 y 2006 se calculan matrices de transición entre diferentes ocupaciones (asalariado formal, asalariado informal, cuenta propia y empleador). Los resultados

Mauricio Santa María S; Carlos Felipe Prada L; Ana Virginia Mujica P

2009-01-01

432

El Vicerrectorado de Relaciones Internacionales presenta las convocatorias de Movilidad Internacional del curso 2012/2013 para PAS,  

E-print Network

El Vicerrectorado de Relaciones Internacionales presenta las convocatorias de Movilidad apuesta estratégica que fomente la movilidad internacional de la comunidad universitaria, el movilidad internacional previstas para el próximo curso 2012/2013. Personal UA PDI.- Convocatoria Erasmus

Escolano, Francisco

433

CIENCIA PARA NINOS Y JVENES El presente artculo abre esta seccin de Educacin Qumica.No cabe duda que la  

E-print Network

CIENCIA PARA NINOS Y J�VENES El presente artículo abre esta sección de Educación Química.No cabe duda que la educación elemental y secundaria sobre las ciencias merecen una atención primordial. Tal

Talanquer, Vicente A.

434

Theoretical Study of the Mechanism Behind the para-Selective Nitration of Toluene in Zeolite H-Beta  

SciTech Connect

Periodic density functional theory calculations were performed to investigate the origin of the favorable para-selective nitration of toluene exhibited by zeolite H-beta with acetyl nitrate nitration agent. Energy calculations were performed for each of the 32 crystallographically unique Bronsted acid sites of a beta polymorph B zeolite unit cell with multiple Bronsted acid sites of comparable stability. However, one particular aluminum T-site with three favorable Bronsted site oxygens embedded in a straight 12-T channel wall provides multiple favorable proton transfer sites. Transition state searches around this aluminum site were performed to determine the barrier to reaction for both para and ortho nitration of toluene. A three-step process was assumed for the nitration of toluene with two organic intermediates: the pi- and sigma-complexes. The rate limiting step is the proton transfer from the sigma-complex to a zeolite Bronsted site. The barrier for this step in ortho nitration is shown to be nearly 2.5 times that in para nitration. This discrepancy appears to be due to steric constraints imposed by the curvature of the large 12-T pore channels of beta and the toluene methyl group in the ortho approach that are not present in the para approach.

Andersen, Amity; Govind, Niranjan; Subramanian, Lalitha

2011-11-28

435

Estudios de la Facultad de Derecho Informacin sobre PREINSCRIPCIN y MATRCULA para el curso 2014-2015  

E-print Network

Estudios de la Facultad de Derecho Información sobre PREINSCRIPCI�N y MATRÍCULA para el curso 2014 · DERECHO · DERECHO-ADE (DADE) · DERECHO-CRIMINOLOGÍA (DECRIM) · GESTI�N Y ADMINISTRACI�N P�BLICA Universitario en Derecho Ambiental y de la Sostenibilidad · Doctorado en Derecho · Curso de experto en Derecho

Escolano, Francisco

436

Para informacin adicional: 1-866-4-USWAGE(1-866-487-9243) TTY: 1-877-889-5627  

E-print Network

agricultura. Para más información visite el sitio del Internet YouthRules! en la dirección www y las islas Marianas del Norte. · Si la ley estatal requiere un salario mínimo más alto, tal salario

Fraden, Seth

437

Evoluindo para uma Arquitetura de Groupware Baseada em Componentes: o Estudo de Caso do Learningware AulaNet  

E-print Network

Evoluindo para uma Arquitetura de Groupware Baseada em Componentes: o Estudo de Caso do}@inf.puc-rio.br;abraposo@tecgraf.puc-rio.br Abstract. Groupware must be flexible in order to satisfy the different characteristics and the continuous as a basis for building different types of groupware. It ensues in the new AulaNet architecture

Barbosa, Alberto

438

PLASMA CLEARANCE OF VITELLOGENIN IN SHEEPSHEAD MINNOWS AFTER CESSATION OF EXPOSURE TO 17BETA-ESTRADIOL AND PARA-NONYLPHENOL  

EPA Science Inventory

Two experiments were performed to determine the rate of vitellogenin plasma accumulation and clearance in male sheepshead minnows (Cyprinodon variegatus) during and after exposure to either 17b-estradiol (E2) or para-nonylphenol (p-NP). Adult fish were continuously exposed to aqu...

439

Equilibrium (a), (b) and para-equilibrium (c), (d) phase diagrams for the two steels received from POSCO  

E-print Network

Equilibrium (a), (b) and para-equilibrium (c), (d) phase diagrams for the two steels received from POSCO 1000 1200 1400 1600 1800 0 20 40 60 80 100 35 wt.% (a) DT2_P: Equilibrium Amountofphase_P: Equilibrium Amountofphase/wt% Temperature / K Austenite ferrite Liquid Cementite Ferrite 51 wt

Cambridge, University of

440

Glen Biotech SL, empresa del Parque Cientfico de Alicante, obtiene una ayuda CDTI para su proyecto de I+D  

E-print Network

Glen Biotech SL, empresa del Parque Científico de Alicante, obtiene una ayuda CDTI para su proyecto de I+D Alicante, 6 de julio de 2011 GLEN BIOTECH SL, empresa de base tecnológica (EBT) del Parque a 400.000 . Glen Biotech SL es la primera EBT de la Universidad de Alicante (UA) y ha sido creada

Escolano, Francisco

441

Significado de los cambios en el cuello uterino: Guía para la salud de la mujer-epub  

Cancer.gov

Explica los pasos que deben seguirse después de un resultado anormal en una prueba de Pap o del VPH, así como las formas de diagnosticar y tratar las afecciones en el cuello uterino. También contiene información sobre las pautas para los exámenes de detección y las vacunas contra el VPH.

442

Significado de los cambios en el cuello uterino: Guía para la salud de la mujer-mobi  

Cancer.gov

Explica los pasos que deben seguirse después de un resultado anormal en una prueba de Pap o del VPH, así como las formas de diagnosticar y tratar las afecciones en el cuello uterino. También contiene información sobre las pautas para los exámenes de detección y las vacunas contra el VPH.

443

Estudio para la prevención del cáncer necesita voluntarias: El Estudio del Tamoxifeno y Raloxifeno (STAR) se realiza en Norteamérica  

Cancer.gov

El Estudio del Tamoxifeno y Raloxifeno (STAR, por sus siglas en inglés), uno de los estudios más importantes realizados para la prevención del cáncer del seno, está ahora reclutando voluntarias en más de 400 centros en los Estados Unidos, Puerto Rico y Canadá.

444

Conservation of ParaHox genes' function in patterning of the digestive tract of the marine gastropod Gibbula varia  

PubMed Central

Background Presence of all three ParaHox genes has been described in deuterostomes and lophotrochozoans, but to date one of these three genes, Xlox has not been reported from any ecdysozoan taxa and both Xlox and Gsx are absent in nematodes. There is evidence that the ParaHox genes were ancestrally a single chromosomal cluster. Colinear expression of the ParaHox genes in anterior, middle, and posterior tissues of several species studied so far suggest that these genes may be responsible for axial patterning of the digestive tract. So far, there are no data on expression of these genes in molluscs. Results We isolated the complete coding sequences of the three Gibbula varia ParaHox genes, and then tested their expression in larval and postlarval development. In Gibbula varia, the ParaHox genes participate in patterning of the digestive tract and are expressed in some cells of the neuroectoderm. The expression of these genes coincides with the gradual formation of the gut in the larva. Gva-Gsx patterns potential neural precursors of cerebral ganglia as well as of the apical sensory organ. During larval development this gene is involved in the formation of the mouth and during postlarval development it is expressed in the precursor cells involved in secretion of the radula, the odontoblasts. Gva-Xolx and Gva-Cdx are involved in gut patterning in the middle and posterior parts of digestive tract, respectively. Both genes are expressed in some ventral neuroectodermal cells; however the expression of Gva-Cdx fades in later larval stages while the expression of Gva-Xolx in these cells persists. Conclusions In Gibbula varia the ParaHox genes are expressed during anterior-posterior patterning of the digestive system. This colinearity is not easy to spot during early larval stages because the differentiated endothelial cells within the yolk permanently migrate to their destinations in the gut. After torsion, Gsx patterns the mouth and foregut, Xlox the midgut gland or digestive gland, and Cdx the hindgut. ParaHox genes of Gibbula are also expressed during specification of cerebral and ventral neuroectodermal cells. Our results provide additional support for the ancestral complexity of Gsx expression and its ancestral role in mouth patterning in protostomes, which was secondarily lost or simplified in some species. PMID:20624311

2010-01-01

445

A remarkably stable TipE gene cluster: evolution of insect Para sodium channel auxiliary subunits  

PubMed Central

Background First identified in fruit flies with temperature-sensitive paralysis phenotypes, the Drosophila melanogaster TipE locus encodes four voltage-gated sodium (NaV) channel auxiliary subunits. This cluster of TipE-like genes on chromosome 3L, and a fifth family member on chromosome 3R, are important for the optional expression and functionality of the Para NaV channel but appear quite distinct from auxiliary subunits in vertebrates. Here, we exploited available arthropod genomic resources to trace the origin of TipE-like genes by mapping their evolutionary histories and examining their genomic architectures. Results We identified a remarkably conserved synteny block of TipE-like orthologues with well-maintained local gene arrangements from 21 insect species. Homologues in the water flea, Daphnia pulex, suggest an ancestral pancrustacean repertoire of four TipE-like genes; a subsequent gene duplication may have generated functional redundancy allowing gene losses in the silk moth and mosquitoes. Intronic nesting of the insect TipE gene cluster probably occurred following the divergence from crustaceans, but in the flour beetle and silk moth genomes the clusters apparently escaped from nesting. Across Pancrustacea, TipE gene family members have experienced intronic nesting, escape from nesting, retrotransposition, translocation, and gene loss events while generally maintaining their local gene neighbourhoods. D. melanogaster TipE-like genes exhibit coordinated spatial and temporal regulation of expression distinct from their host gene but well-correlated with their regulatory target, the Para NaV channel, suggesting that functional constraints may preserve the TipE gene cluster. We identified homology between TipE-like NaV channel regulators and vertebrate Slo-beta auxiliary subunits of big-conductance calcium-activated potassium (BKCa) channels, which suggests that ion channel regulatory partners have evolved distinct lineage-specific characteristics. Conclusions TipE-like genes form a remarkably conserved genomic cluster across all examined insect genomes. This study reveals likely structural and functional constraints on the genomic evolution of insect TipE gene family members maintained in synteny over hundreds of millions of years of evolution. The likely common origin of these NaV channel regulators with BKCa auxiliary subunits highlights the evolutionary plasticity of ion channel regulatory mechanisms. PMID:22098672

2011-01-01

446

Intensity-Modulated Radiation Therapy for the Treatment of Squamous Cell Anal Cancer With Para-aortic Nodal Involvement  

SciTech Connect

Purpose: To determine the rates of toxicity, locoregional control, distant control, and survival in anal cancer patients with para-aortic nodal involvement, treated with intensity-modulated radiotherapy (IMRT) and concurrent chemotherapy at a single institution. Methods and Materials: Between 2001 and 2007, 6 patients with squamous cell anal cancer and para-aortic nodal involvement were treated with IMRT and concurrent infusional 5-fluorouracil and cisplatin. The primary tumor was treated with a median dose of 57.5 Gy (range, 54-60 Gy), involved para-aortic, pelvic, and inguinal lymph nodes were treated with a median dose of 55 Gy (range, 50.5-55 Gy), and noninvolved nodal regions were treated with a median dose of 45 Gy (range, 43.5-45 Gy). Results: After a median follow-up of 25 months, none of the patients had a recurrence at the primary tumor, pelvic/inguinal nodes, or para-aortic nodes, whereas 2 patients developed distant metastases to the liver. Four of the 6 patients are alive. The 3-year actuarial locoregional control, distant control, and overall survival rates were 100%, 56%, and 63%, respectively. Four of the 6 patients developed Grade 3 acute gastrointestinal toxicity during chemoradiation. Conclusions: Intensity-modulated radiotherapy and concurrent chemotherapy could potentially serve as definitive therapy in anal cancer patients with para-aortic nodal involvement. Adjuvant chemotherapy may be indicated in these patients, as demonstrated by the distant failure rates. These patients need to be followed carefully because of the potential for treatment-related toxicities.

Hodges, Joseph C. [Department of Radiation Oncology, University of Texas M. D. Anderson Cancer Center, Houston, TX (United States); Das, Prajnan, E-mail: PrajDas@mdanderson.or [Department of Radiation Oncology, University of Texas M. D. Anderson Cancer Center, Houston, TX (United States); Eng, Cathy [Department of Gastrointestinal Medical Oncology, University of Texas M. D. Anderson Cancer Center, Houston, TX (United States); Reish, Andrew G. [Department of Radiation Oncology, University of Texas M. D. Anderson Cancer Center, Houston, TX (United States); Beddar, A. Sam [Department of Radiation Physics, University of Texas M. D. Anderson Cancer Center, Houston, TX (United States); Delclos, Marc E.; Krishnan, Sunil; Crane, Christopher H. [Department of Radiation Oncology, University of Texas M. D. Anderson Cancer Center, Houston, TX (United States)

2009-11-01

447

A 120-yr record of widespread contamination from mining of the Iberian pyrite belt  

Microsoft Academic Search

A metal-enriched seawater plume entering the western Mediterranean Sea through the Strait of Gibraltar originates 300 km to the west in the Rio Tinto estuary of southwestern Spain. Mining of Rio Tinto ore, one of the largest metal-rich sulfide deposits in the world, started well before Roman times. Contemporary Rio Tinto waters draining the region are highly acidic (pH 2.5)

A. van Geen; J. F. Adkins; E. A. Boyle; C. H. Nelson; A. Palanques

1997-01-01

448

Los NIH anuncian el lanzamiento de 3 estudios integrados de medicina de precisión; ALCHEMIST es para pacientes con ciertos tipos de cáncer de pulmón en estadio inicial  

Cancer.gov

Los Estudios sobre la Secuenciación e Identificación de Marcadores para el Mejoramiento de la Terapia Adjuvante para el Cáncer de Pulmón, conocidos con el nombre de ALCHEMIST, identificarán a pacientes con cáncer de pulmón en estadio inicial cuyos tumores albergan ciertos cambios genéticos, y evaluarán si los tratamientos con medicamentos que actúan sobre esos cambios pueden mejorar la supervivencia.

449

Polar substituent effect of the ester group on conformational equilibria of O-mono-substituted cyclohexanes —the para-substituent effect in cyclohexyl benzoates  

Microsoft Academic Search

Together with the nonsubstituted reference compound, para-methoxy- and para-nitro cyclohexyl benzoates have been synthesized and their conformational equilibria studied by low temperature NMR spectroscopy and theoretical DFT calculations. The free energy differences ?G° between axial and equatorial conformers were examined with respect to polar substituent influences on the conformational equilibrium of O-mono-substituted cyclohexane.

Erich Kleinpeter; Ute Bölke; Andrea Frank

2008-01-01

450

HERRAMIENTAS GERENCIALES PARA EL POSICIONAMIENTO DE LA EMPRESA SOSTENIBLE Y EL MARKETING ECOLÓGICO Management tools and positioning of sustainable enterprises and marketing ecological  

Microsoft Academic Search

RESUMEN La civilización humana está direccionando su acción comercial hacia el componente ecológico, tomando como principio la gerencia para proyectarse al mercado verde es decir, productos que generen menor impacto ambiental. La presente investigación tuvo como objetivo determinar las herramientas gerenciales para el posicionamiento de la empresa sostenible y el marketing ecológico. Este trabajo de investigación fue descriptivo, transeccional y

Dalia Plata de Plata

451

Determinación de la aptitud de uso del suelo para producción de cultivos con fines bioenergéticos en la provincia de Salta (Noroeste Argentino)  

Microsoft Academic Search

RESUMEN El presente trabajo presenta los resultados alcanzados en la determinación de la aptitud de uso del suelo para producción de cultivos con fines bioenergéticos en la provincia de Salta (Argentina). Para este propósito se buscó aunar los criterios de sustentabilidad social, económica, energética y ambiental que definen el desarrollo sostenible de los sistemas bioenergéticos. El objetivo principal del trabajo

Renée Alicia Anschau; María Cad; Stella Carballo; Noelia Flores

2011-01-01

452

Efectos de la fertilización orgánica y fosfatada en las características de calidad para fritura de 35 variedades nativas de papa amarilla en la Sierra Central del Perú  

Microsoft Academic Search

Resumen Un total de 35 variedades nativas de papa amarilla fue evaluado en dos experimentos de fertilización orgánica y fosfatada, situados en cuatro localidades alto andinas para determinar rendimiento y características de calidad para fritura en respuesta a tres niveles de fertilización orgánica y fosfatada, respectivamente. En base a un grupo de siete clones presentes en ambos experimentos se observó

A. Devaux; K. Manrique; C. Riveros; N. Zúñiga; A. Santana

453

Multi-modality guided trans-apical closure of recurrent mitral para-valvular regurgitation after failed surgical management in a patient with osteogenesis imperfecta.  

PubMed

We report a case of a 54 year-old man with osteogenesis imperfecta who developed severe para-valvular mitral regurgitation after a second heart operation to correct the same problem. The large para-valvular leak was successfully closed with an Amplatzer Vascular Plug III delivered from the apical approach. PMID:25082307

Boganashanmugam, Vimalraj; Goldstein, Jacob; Harper, Richard W

2014-11-01

454

Involvement of the Azorhizobial Chromosome Partition Gene (parA) in the Onset of Bacteroid Differentiation during Sesbania rostrata Stem Nodule Development ? †  

PubMed Central

A parA gene in-frame deletion mutant of Azorhizobium caulinodans ORS571 (ORS571-?parA) was constructed to evaluate the roles of the chromosome-partitioning gene on various bacterial traits and on the development of stem-positioned nodules. The ?parA mutant showed a pleiomorphic cell shape phenotype and was polyploid, with differences in nucleoid sizes due to dramatic defects in chromosome partitioning. Upon inoculation of the ?parA mutant onto the stem of Sesbania rostrata, three types of immature nodule-like structures with impaired nitrogen-fixing activity were generated. Most showed signs of bacteroid early senescence. Moreover, the ?parA cells within the nodule-like structures exhibited multiple developmental-stage phenotypes. Since the bacA gene has been considered an indicator for bacteroid formation, we applied the expression pattern of bacA as a nodule maturity index in this study. Our data indicate that the bacA gene expression is parA dependent in symbiosis. The presence of the parA gene transcript was inversely correlated with the maturity of nodule; the transcript was switched off in fully mature bacteroids. In summary, our experimental evidence demonstrates that the parA gene not only plays crucial roles in cellular development when the microbe is free-living but also negatively regulates bacteroid formation in S. rostrata stem nodules. PMID:21571889

Liu, Chi-Te; Lee, Kyung-Bum; Wang, Yu-Sheng; Peng, Min-Hua; Lee, Kung-Ta; Suzuki, Shino; Suzuki, Tadahiro; Oyaizu, Hiroshi

2011-01-01

455

Desenvolvimento de NPCs para o Jogo Estrada Real Digital Carlcio S. Cordeiro, Carlos Augusto P. de Sousa, Diogo S. Sampaio, Luiz Gustavo  

E-print Network

Desenvolvimento de NPCs para o Jogo Estrada Real Digital Carlúcio S. Cordeiro, Carlos Augusto P. de a criação de personagens realísticos para o jogo "Estrada Real Digital" um jogo de aventura em primeira jogos modernos. Com o desenvolvimento de jogos com cenários e gráficos extremamente elaborados, tem

Chaimowicz, Luiz

456

LabVIEW-based control software for para-hydrogen induced polarization instrumentation  

NASA Astrophysics Data System (ADS)

The elucidation of cell metabolic mechanisms is the modern underpinning of the diagnosis, treatment, and in some cases the prevention of disease. Para-Hydrogen induced polarization (PHIP) enhances magnetic resonance imaging (MRI) signals over 10 000 fold, allowing for the MRI of cell metabolic mechanisms. This signal enhancement is the result of hyperpolarizing endogenous substances used as contrast agents during imaging. PHIP instrumentation hyperpolarizes Carbon-13 (13C) based substances using a process requiring control of a number of factors: chemical reaction timing, gas flow, monitoring of a static magnetic field (Bo), radio frequency (RF) irradiation timing, reaction temperature, and gas pressures. Current PHIP instruments manually control the hyperpolarization process resulting in the lack of the precise control of factors listed above, resulting in non-reproducible results. We discuss the design and implementation of a LabVIEW based computer program that automatically and precisely controls the delivery and manipulation of gases and samples, monitoring gas pressures, environmental temperature, and RF sample irradiation. We show that the automated control over the hyperpolarization process results in the hyperpolarization of hydroxyethylpropionate. The implementation of this software provides the fast prototyping of PHIP instrumentation for the evaluation of a myriad of 13C based endogenous contrast agents used in molecular imaging.

Agraz, Jose; Grunfeld, Alexander; Li, Debiao; Cunningham, Karl; Willey, Cindy; Pozos, Robert; Wagner, Shawn

2014-04-01

457

ParaText : scalable solutions for processing and searching very large document collections : final LDRD report.  

SciTech Connect

This report is a summary of the accomplishments of the 'Scalable Solutions for Processing and Searching Very Large Document Collections' LDRD, which ran from FY08 through FY10. Our goal was to investigate scalable text analysis; specifically, methods for information retrieval and visualization that could scale to extremely large document collections. Towards that end, we designed, implemented, and demonstrated a scalable framework for text analysis - ParaText - as a major project deliverable. Further, we demonstrated the benefits of using visual analysis in text analysis algorithm development, improved performance of heterogeneous ensemble models in data classification problems, and the advantages of information theoretic methods in user analysis and interpretation in cross language information retrieval. The project involved 5 members of the technical staff and 3 summer interns (including one who worked two summers). It resulted in a total of 14 publications, 3 new software libraries (2 open source and 1 internal to Sandia), several new end-user software applications, and over 20 presentations. Several follow-on projects have already begun or will start in FY11, with additional projects currently in proposal.

Crossno, Patricia Joyce; Dunlavy, Daniel M.; Stanton, Eric T.; Shead, Timothy M.

2010-09-01

458

Mini-mastoidectomía para anastomosis hipogloso-facial con sección parcial del nervio hipogloso  

PubMed Central

Introducción: La anastomosis hipogloso-facial es la técnica de elección para la reparación de la parálisis facial cuando no se dispone de un cabo proximal sano del nervio facial. La técnica de anastomosis mediante fresado mastoideo y sección parcial del hipogloso minimiza la atrofia lingual sin sacrificar resultados a nivel facial. Método: La porción mastoidea del nervio facial transcurre por la pared anterior de la AM, a un promedio de 18+/-3 mm de profundidad respecto de la pared lateral. Se debe reconocer la cresta supramastoidea, desde la cual se marca una línea vertical paralela al eje mayor de la AM, 1 cm por detrás de la pared posterior del CAE El fresado se comienza desde la línea medio mastoidea hasta la pared posterior del CAE. Una vez encontrado el nervio facial en el tercio medio del canal mastoideo, el mismo es seguido hacia proximal y distal. Resultados: El abordaje descripto permite acceder al nervio facial intratemporal en su porción mastoidea, y efectuar un fresado óseo sin poner en riesgo al nervio o a estructuras vasculares cercanas. Se trata de un procedimiento técnicamente más sencillo que los abordajes amplios habitualmente utilizados al hueso temporal; no obstante su uso debe ser restringido mayormente a la anastomosis hipogloso-facial. Conclusión: Esta es una técnica relativamente sencilla, que puede ser reproducida por cirujanos sin mayor experiencia en el tema, luego de su paso por el laboratorio de anatomía. PMID:23596555

Campero, Álvaro; Ajler, Pablo; Socolovsky, Mariano; Martins, Carolina; Rhoton, Albert

2012-01-01

459

Structural elucidation, Hirshfeld surface analysis and quantum mechanical study of para-nitro benzylidene methyl arjunolate  

NASA Astrophysics Data System (ADS)

A benzylidene derivative of arjunolic acid, namely, para-nitro benzylidene methyl arjunolate ( 3) have been synthesized and characterized by X-ray structural studies and the electronic structure was calculated at the DFT level with a detailed analysis of Hirshfeld surface and fingerprint plot facilitating a comparison of intermolecular interactions. The crystal packing of ( 3) exhibits intermolecular O-H⋯O and C-H⋯O hydrogen bonds forming linear chains propagating parallel to [1 0 0] and [0 1 0] directions, respectively, which are further linked through C-H⋯? (arene) bonds to generate two-dimensional framework. Investigation of intermolecular interactions and crystal packing via Hirshfeld surface analysis reveals that more than two-thirds of the close contacts are associated with weak interactions. Hirshfeld surface analysis for visually analyzing intermolecular interactions in crystal structures employing molecular surface contours and 2D fingerprint plots have been used to examine molecular shapes. The large HOMO-LUMO energy gap indicates a high kinetic stability for the title compound ( 3).

Seth, Saikat Kumar; Maity, Gopal Chandra; Kar, Tanusree

2011-08-01

460

LabVIEW-based control software for para-hydrogen induced polarization instrumentation  

SciTech Connect

The elucidation of cell metabolic mechanisms is the modern underpinning of the diagnosis, treatment, and in some cases the prevention of disease. Para-Hydrogen induced polarization (PHIP) enhances magnetic resonance imaging (MRI) signals over 10 000 fold, allowing for the MRI of cell metabolic mechanisms. This signal enhancement is the result of hyperpolarizing endogenous substances used as contrast agents during imaging. PHIP instrumentation hyperpolarizes Carbon-13 ({sup 13}C) based substances using a process requiring control of a number of factors: chemical reaction timing, gas flow, monitoring of a static magnetic field (B{sub o}), radio frequency (RF) irradiation timing, reaction temperature, and gas pressures. Current PHIP instruments manually control the hyperpolarization process resulting in the lack of the precise control of factors listed above, resulting in non-reproducible results. We discuss the design and implementation of a LabVIEW based computer program that automatically and precisely controls the delivery and manipulation of gases and samples, monitoring gas pressures, environmental temperature, and RF sample irradiation. We show that the automated control over the hyperpolarization process results in the hyperpolarization of hydroxyethylpropionate. The implementation of this software provides the fast prototyping of PHIP instrumentation for the evaluation of a myriad of {sup 13}C based endogenous contrast agents used in molecular imaging.

Agraz, Jose, E-mail: joseagraz@ucla.edu; Grunfeld, Alexander; Li, Debiao [Department of Bioengineering, University of California, Los Angeles, California 91791 (United States) [Department of Bioengineering, University of California, Los Angeles, California 91791 (United States); BIRI, Cedars Sinai Medical Center, West Hollywood, California 90048 (United States); Cunningham, Karl [Ectron Corp, San Diego, California 92111 (United States)] [Ectron Corp, San Diego, California 92111 (United States); Willey, Cindy [Harris Corp, San Diego, California 92154 (United States)] [Harris Corp, San Diego, California 92154 (United States); Pozos, Robert [Department of Biology, San Diego State University, San Diego, California 92182 (United States)] [Department of Biology, San Diego State University, San Diego, California 92182 (United States); Wagner, Shawn [BIRI, Cedars Sinai Medical Center, West Hollywood, California 90048 (United States)] [BIRI, Cedars Sinai Medical Center, West Hollywood, California 90048 (United States)

2014-04-15

461

Hematopathology in Sprague-Dawley rats following sub-chronic topical application of para-phenylenediamine.  

PubMed

The aim of the present study was to analyze the hematological profile of male SD rats treated topically with aqueous solution of para-phenylenediamine (PPD), a component of almost all hair dye formulations. The rats were painted with different concentration of PPD (0, 1, 2 and 3 mg Kg(-1) Day(-1)) for 90 days and then sacrificed. The hematological profile indicated severe anemia characterized by significant (p < 0.05, 0.001) reduction of total RBC count (59%), packed cell volume (PCV, 50%) and haemoglobin level (70%) in the peripheral blood of PPD treated animals when compared to control group. The leucocytes profile exhibited an overall elevation of around twofold as compared to the control group with significant lymphocytosis (44.4%) and a higher percentage of blast cells (8.5%) as well as smudge (10.3%) and hairy cells (6.2%) in the peripheral blood of treated animals. Histopathological examination of spleen from treated rat's exhibit red pulp congestion, expansion of the germinal centre, hyperplasia of the membrane capsule and extensive accumulation of hemosidderin pigments in the red pulp of the spleen. Overall this study indicated an abnormal pathophysiological condition indicating adverse effect of PPD in the treated animal groups. The risk assessment of hair dye formulation needs to be reviewed in view of widespread usage of paraphenylenediamine in almost all hair dye formulation. PMID:22886424

Bharali, Manuj Kr; Dutta, Karabi

2012-10-01

462

Testicular toxicity of para-phenylenediamine after subchronic topical application in rat.  

PubMed

Para-phenylenediamine (PPD) is a most widely used chemical in almost all hair dye formulations. The present experiment was conducted in order to assess the reproductive toxicity of PPD in male rats. After sub-chronic topical application of different doses (0, 1, 2 and 3 mg/kg/day) of PPD, the male albino rats exhibited significant decrease in the total sperm count (p<0.05, 0.01) with consistent decrease in the testicular weight (p<0.05), increase in the germ cell apoptosis indicated by cellular morphology as well as loss of germinal layer, sloughing of testicular cellular layers. Elevation of lipid peroxidation product in the testicular tissue indicated the potential oxidative stress that may be crucial in the induction of the apoptosis and further tissue injury in the PPD-treated rats. The study was designed to examine the testicular effect of 1% to 3% PPD which mimic the actual dosage available in most of the hair dying formulation. The possibilities of impaired testicular function after sub-chronic topical exposure to PPD on male rats have demonstrated. PMID:22149045

Bharali, Manuj Kr; Dutta, Karabi

2012-01-01

463

LabVIEW-based control software for para-hydrogen induced polarization instrumentation.  

PubMed

The elucidation of cell metabolic mechanisms is the modern underpinning of the diagnosis, treatment, and in some cases the prevention of disease. Para-Hydrogen induced polarization (PHIP) enhances magnetic resonance imaging (MRI) signals over 10,000 fold, allowing for the MRI of cell metabolic mechanisms. This signal enhancement is the result of hyperpolarizing endogenous substances used as contrast agents during imaging. PHIP instrumentation hyperpolarizes Carbon-13 ((13)C) based substances using a process requiring control of a number of factors: chemical reaction timing, gas flow, monitoring of a static magnetic field (Bo), radio frequency (RF) irradiation timing, reaction temperature, and gas pressures. Current PHIP instruments manually control the hyperpolarization process resulting in the lack of the precise control of factors listed above, resulting in non-reproducible results. We discuss the design and implementation of a LabVIEW based computer program that automatically and precisely controls the delivery and manipulation of gases and samples, monitoring gas pressures, environmental temperature, and RF sample irradiation. We show that the automated control over the hyperpolarization process results in the hyperpolarization of hydroxyethylpropionate. The implementation of this software provides the fast prototyping of PHIP instrumentation for the evaluation of a myriad of (13)C based endogenous contrast agents used in molecular imaging. PMID:24784636

Agraz, Jose; Grunfeld, Alexander; Li, Debiao; Cunningham, Karl; Willey, Cindy; Pozos, Robert; Wagner, Shawn

2014-04-01

464

Interface Properties of Organic para-Hexaphenyl/?-Sexithiophene Heterostructures Deposited on Highly Oriented Pyrolytic Graphite  

PubMed Central

It was recently reported, that heterostructures of para-hexaphenyl (p-6P) and ?-sexithiophene (6T) deposited on muscovite mica exhibit the intriguing possibility to prepare lasing nanofibers of tunable emission wavelength. For p-6P/6T heterostructures, two different types of 6T emission have been observed, namely, the well-known red emission of bulk 6T crystals and additionally a green emission connected to the interface between p-6P and 6T. In this study, the origin of the green fluorescence is investigated by photoelectron spectroscopy (PES). As a prerequisite, it is necessary to prepare structurally similar organic crystals on a conductive surface, which leads to the choice of highly oriented pyrolytic graphite (HOPG) as a substrate. The similarity between p-6P/6T heterostructures on muscovite mica and on HOPG is evidenced by X-ray diffraction (XRD), scanning force microscopy (SFM), and optical spectroscopy. PES measurements show that the interface between p-6P and 6T crystals is sharp on a molecular level without any sign of interface dipole formation or chemical interaction between the molecules. We therefore conclude that the different emission colors of the two 6T phases are caused by different types of molecular aggregation. PMID:24156627

2013-01-01

465

Determination of para-Phenylenediamine (PPD) in Henna in the United Arab Emirates  

PubMed Central

Henna is very popular in the United Arab Emirates (UAE); it is part of the culture and traditions. Allergy to natural henna is not usual; however the addition of para-phenylenediamine (PPD) to the natural henna increases the risk of allergic contact dermatitis. The objectives of the study were to identify the presence and concentration of PPD in henna available in UAE. Fifteen henna salons were selected randomly from three cities in UAE. Twenty five henna samples were acquired from these selected salons. The presence of PPD in henna samples was determined qualitatively and quantitatively using High Performance Liquid Chromatography (HPLC). The study showed that PPD was present in all of the black henna samples at concentrations ranging between 0.4% and 29.5% and higher than that recommended for hair dyes in most of the black henna samples. The presence of PPD in the black henna increases the risk of allergic contact dermatitis among users of black henna and a number of cases have already been reported in UAE. PMID:20617053

Al-Suwaidi, Ayesha; Ahmed, Hafiz

2010-01-01

466

Origin of the low-energy emission band in epitaxially grown para-sexiphenyl nanocrystallites  

NASA Astrophysics Data System (ADS)

A comparative study of steady-state and time-resolved photoluminescence of para-sexiphenyl (PSP) films grown by organic molecular beam epitaxy (OMBE) and hot wall epitaxy (HWE) under comparable conditions is presented. Using different template substrates [mica(001) and KCl(001) surfaces] as well as different OMBE growth conditions has enabled us to vary greatly the morphology of the PSP crystallites while keeping their chemical structure virtually untouched. We prove that the broad redshifted emission band has a structure-related origin rather than being due to monomolecular oxidative defects. We conclude that the growth conditions and type of template substrate impacts substantially on the film morphology (measured by atomic force microscopy) and emission properties of the PSP films. The relative intensity of the defect emission band observed in the delayed spectra was found to correlate with the structural quality of PSP crystallites. In particular, the defect emission has been found to be drastically suppressed when (i) a KCl template substrate was used instead of mica in HWE-grown films, and (ii) in the OMBE-grown films dominated by growth mounds composed of upright standing molecules as opposed to the films consisting of crystallites formed by molecules lying parallel to the substrate.

Kadashchuk, A.; Schols, S.; Heremans, P.; Skryshevski, Yu.; Piryatinski, Yu.; Beinik, I.; Teichert, C.; Hernandez-Sosa, G.; Sitter, H.; Andreev, A.; Frank, P.; Winkler, A.

2009-02-01

467

Searching for auxetics with DYNA3D and ParaDyn  

NASA Astrophysics Data System (ADS)

The present special issue of physica status solidi (b), guest-edited by Krzysztof W. Wojciechowski, Andrew Alderson, Arkadiusz Braka, and Kim L. Alderson, is dedicated to Auxetics and Related Systems - materials which exhibit negative Poisson's ratio behaviour. Most papers were presented at a workshop which was held in Pozna-Bdlewo, 27-30 June 2004.In our Editor's Choice [1] novel simulations with a parallel finite element program, ParaDyn, have been conducted to study the formation of auxetic materials. Structures composed of either brick elements (hexahedra) or shell elements are constructed in a regular array of panels. These structures are compressed and relaxed to form an initial state for an auxetic (foam-like) material. The foam structure shown is composed of 208896 shell elements arranged in four by four panels. Applying a uniaxial compression to this structure characterizes the material behaviour of the lateral surfaces as normal (expanding) or auxetic (compressing).The first author, William G. Hoover, has been working in areas such as statistical and applied mechanics, nonlinear and molecular dynamics and is now pursuing, as he states on his own webpage, an active retired research career as Professor Emeritus of UC Davis.

Hoover, Wm. G.; Hoover, C. G.

2005-03-01

468

Synthesis, crystal structure and spectroscopic study of para substituted 2-hydroxy-3-methoxybenzalideneanilines  

NASA Astrophysics Data System (ADS)

Eight Schiff bases derived from 2-hydroxy-3-methoxybenzaldehyde and different para substituted anilines have been synthesized and their structures were elucidated by physical measurements and FT-IR. NMR assignments were made using 1H, 13C NMR and aided by 2D COSY homonuclear, HMQC and HMBC heteronuclear correlation techniques. IR spectral analysis of the model compounds was found useful in understanding the degree of stabilization upon this series of enol-imino tautomers, which possess different substituents in the aniline fragment. In order to rationalize the stabilization of tautomer in solid state, the crystallography data of 1-{(4-methylphenylimino)methyl}- and 1-{(4-chlorophenylimino)methyl}-2-hydroxy-3-methoxyphenol were adopted wherein the 4-chloro (4-Cl) and 4-methyl (4-CH 3) containing compounds crystallized into orthorhombic lattice with a non-centrosymmetric space group P2 12 12 1. The relationship between the stabilization of bonding involved in heteronuclear six-membered ring of the tautomer and the conformation of the molecules in crystal phase was reported.

Yeap, Guan-Yeow; Ha, Sie-Tiong; Ishizawa, Nobuo; Suda, Katsumi; Boey, Peng-Lim; Kamil Mahmood, Wan Ahmad

2003-09-01

469

Hyperfine excitation of CN by para- and ortho-H2  

NASA Astrophysics Data System (ADS)

Among the interstellar molecules, the CN radical is of particular interest since it is a good probe of cold dark molecular clouds, and especially prestellar cores. Modelling of CN emission spectra from these dense molecular clouds requires the calculation of rate coefficients for excitation by collisions with the most abundant species. We calculate fine- and hyperfine-structure-resolved excitation rate coefficients of CN(X2?+) by para- and ortho-H2. The calculations are based on a new potential energy surface obtained recently from highly correlated ab initio calculations. State-to-state rate coefficients between fine and hyperfine levels of CN were calculated for low temperatures ranging from 5 to 100 K. The new results are compared to available CN rate coefficients. Significant differences are found between the different sets of rate coefficients. This comparison shows that the new CN-H2 rate coefficients have to be used for observations interpretations. We expect that their use will help significantly to have a new insight into the physical conditions of prestellar cores.

Kalugina, Yulia; Lique, François

2015-01-01

470

Correlations of intra- and intermolecular dynamics and structure in liquid para -hydrogen  

NASA Astrophysics Data System (ADS)

Although hydrogen is the simplest of all molecular species, its nuclear quantum effects dominate the structure and thermodynamical properties of the condensed phases. With a recently developed nonempirical quantum molecular dynamics simulation method, we present intuitive understandings of real-time dynamics of each para -hydrogen(p -H2) molecule in the liquid phase including its H-H bond vibrations, molecular orientations, and librational motions. The short- and long-living memories of angular dynamics we found suggest that p -H2 should be described as a librating nonspherical diatomic molecule and can be characterized by two typical dynamics: kinetic motions inside a solvation shell and diffusive dynamics out of the shell. The real-time trajectory reveals that structural rearrangements of a p -H2 molecule such as breakout from a solvation shell significantly correlate with its intramolecular structure and fluctuations. The H-H bond power spectra completely fitted by two functions also indicate that liquid p -H2 has two typical structures. The condensed-phase effects on shifts and broadening of H-H bond stretching frequencies, intrinsic librational dynamics, and molecular orientational distributions are computationally demonstrated and physically rationalized.

Hyeon-Deuk, Kim; Ando, Koji

2014-10-01

471

Optimal timing algorithms of para-aortic counterpulsation device: an animal study.  

PubMed

Para-aortic counterpulsation device (PACD) is a promising therapy for severe heart failure (HF). However, the lack of knowledge about mechanisms has limited its clinical application. The aim of this study was to investigate the optimal timing algorithms. At the following four triggering algorithms, pre-R-wave-deflation and dicrotic notch-inflation (PD), pre-R-wave-deflation and postdicrotic notch-inflation (PP), R-wave-deflation and dicrotic notch-inflation (RD), and R-wave-deflation and postdicrotic notch-inflation (RP), hemodynamic effects of PACD were assessed in vivo. There was more significant promotion of left mean coronary artery flow (Q(LM)), carotid artery flow (Q(CA)), cardiac output (CO), pulmonary artery flow/LA pressure ratio (Q(PA)/LAP), left ventricular myocardial oxygen consumption (LVVO(2)), external LV work (ELVW), and cardiac mechanical efficiency (CME) at RD and RP models than PD and PP models. R-wave-deflation and postdicrotic notch-inflation model provided further benefits. There was significant correlation between LV functional parameters and carotid arterial reflux, but aortic pressure-related parameters. Filling at beginning of LV systolic phase and ejection at the end of isovolumic relaxation phase were the optimal triggering algorithms of PACD. It is suggested that carotid artery reflows and ventricular pressure-related parameters should be used as reference standard to adjust the timing of balloon inflation or deflation. PMID:22236623

Zhang, Guang-Wei; Wen, Ti; Gu, Tian-Xiang; Yu, Yang; Zhao, Ye; Zhang, Yu-Hai; Wang, Chun

2012-01-01

472

A Mutation in Para-Hydroxybenzoate-Polyprenyl Transferase (COQ2) Causes Primary Coenzyme Q10 Deficiency  

PubMed Central

Ubiquinone (coenzyme Q10 or CoQ10) is a lipid-soluble component of virtually all cell membranes, where it functions as a mobile electron and proton carrier. CoQ10 deficiency is inherited as an autosomal recessive trait and has been associated with three main clinical phenotypes: a predominantly myopathic form with central nervous system involvement, an infantile encephalomyopathy with renal dysfunction, and an ataxic form with cerebellar atrophy. In two siblings of consanguineous parents with the infantile form of CoQ10 deficiency, we identified a homozygous missense mutation in the COQ2 gene, which encodes para-hydroxybenzoate-polyprenyl transferase. The A?G transition at nucleotide 890 changes a highly conserved tyrosine to cysteine at amino acid 297 within a predicted transmembrane domain. Radioisotope assays confirmed a severe defect of CoQ10 biosynthesis in the fibroblasts of one patient. This mutation in COQ2 is the first molecular cause of primary CoQ10 deficiency. PMID:16400613

Quinzii, Catarina; Naini, Ali; Salviati, Leonardo; Trevisson, Eva; Navas, Plácido; DiMauro, Salvatore; Hirano, Michio

2006-01-01

473

Clinical and experimental aspects of allergic contact dermatitis to para-phenylenediamine.  

PubMed

The allergenicity of para-phenylenediamine (PPD) is related to oxidative processes on and in the skin. Patients with stronger reactions to PPD are significantly more likely to have a clear history of reacting to normal consumer hair dye. Those with stronger reactions are much less likely to be still dyeing their hair. Individuals allergic to PPD have a significant frequency of simultaneous sensitivity to chemically related clothing dyes. A 24-hour test application of hair dye, which has been proposed as a self-screen, does not reliably predict all individuals allergic to PPD. Duration studies have proven that exposures of 5 to 30 minutes, the period used for hair dyeing, are sufficient to elicit reactions. A significant rise in the frequency of PPD allergy was observed over 7 years among our patch test population. Active sensitization from standard PPD patch testing is not common. Immunologic findings relating to PPD can correctly predict that if hair dyes are commonly used there will be a significant prevalence of allergy to PPD among the normal adult population and that some clinical reactions will be severe. To protect the public from allergy to chemicals in consumer products, immunologic and epidemiologic data should both be used by regulatory authorities. PMID:21496741

McFadden, John P; Yeo, Lyndsey; White, Jonathan L

2011-01-01

474

A method to obtain a well-defined fraction of respirable para-aramid fibers.  

PubMed Central

We developed a preparation method to obtain respirable-sized fractions of para-aramid fibers. The procedure, based on floatability, consists of stirring and subsequent settling of p-aramid pulp in distilled water. Two distinct phases are obtained, with small fibers in the upper part of the suspension, which represents about 33% of the total volume. Optimal results were obtained when 2.0 g pulp was stirred for 15 hr in 800 ml distilled water containing 0.125% ethanol and settled for 5 hr. The mass yield ranged between 0.4 and 0.6%, more than 90% of the particles had an aspect ratio > or = 3:1. The mean fiber length was about 6 microns, and the mean fiber diameter was about 0.4 microns as determined by transmission and scanning electron microscopy. The number of fibers obtained was 4 x 10(6) fibers/micrograms under our standard conditions. Images p414-a Figure 1. Figure 2. Figure 3. PMID:8119251

Schins, R P; Gaudichet, A; Jaurand, M C

1993-01-01

475

From clusters to fibers: Parameters for discontinuous para-hexaphenylene thin film growth  

SciTech Connect

All relevant steps of discontinuous thin film growth of para-hexaphenylene on muscovite mica (0 0 1) from wetting layer over small and large clusters to nanofibers are observed and investigated in detail by a combined polarized fluorescence and atomic force microscopy study. From a variation of film thickness and surface temperature, we determine effective activation energies for cluster growth of 0.17 eV, for nanofiber length growth of 0.46 eV, for width growth of 0.19 eV, and for height growth of 0.07 eV. The corresponding exponential prefactors for the nanofiber growth are 1x10{sup 9}, 6x10{sup 4}, and 3x10{sup 2} nm. Polarized fluorescence studies reveal that nanofibers grow along the grooves of the mica surface and that they do not change direction if they cross an even number of mica surface steps, while they change direction by 120 deg. for an odd number of steps. These results are taken as an input for a model of the unidirectional growth process on mica. Absolute parameters allowing one to grow nanofibers of predetermined morphology via organic molecular beam epitaxy are also given.

Kankate, Laxman; Balzer, Frank; Niehus, Horst [Humboldt-Universitaet zu Berlin, Newtonstr. 15, D-12489 Berlin (Germany); Rubahn, Horst-Guenter [Mads Clausen Institute, NanoSYD, Syddansk Universitet, DK-6400 Soenderborg (Denmark)

2008-02-28

476

Origin of the low-energy emission band in epitaxially grown para-sexiphenyl nanocrystallites  

SciTech Connect

A comparative study of steady-state and time-resolved photoluminescence of para-sexiphenyl (PSP) films grown by organic molecular beam epitaxy (OMBE) and hot wall epitaxy (HWE) under comparable conditions is presented. Using different template substrates [mica(001) and KCl(001) surfaces] as well as different OMBE growth conditions has enabled us to vary greatly the morphology of the PSP crystallites while keeping their chemical structure virtually untouched. We prove that the broad redshifted emission band has a structure-related origin rather than being due to monomolecular oxidative defects. We conclude that the growth conditions and type of template substrate impacts substantially on the film morphology (measured by atomic force microscopy) and emission properties of the PSP films. The relative intensity of the defect emission band observed in the delayed spectra was found to correlate with the structural quality of PSP crystallites. In particular, the defect emission has been found to be drastically suppressed when (i) a KCl template substrate was used instead of mica in HWE-grown films, and (ii) in the OMBE-grown films dominated by growth mounds composed of upright standing molecules as opposed to the films consisting of crystallites formed by molecules lying parallel to the substrate.

Kadashchuk, A. [IMEC v.z.w., SOLO-PME, Kapeldreef 75, B-3001 Leuven (Belgium); Institute of Physics, National Academy of Science of Ukraine, Kiev 03028 (Ukraine); Schols, S. [IMEC v.z.w., SOLO-PME, Kapeldreef 75, B-3001 Leuven (Belgium); Department of Electrical Engineering, Katholieke Universiteit Leuven, B-3001 Leuven (Belgium); Heremans, P. [IMEC v.z.w., SOLO-PME, Kapeldreef 75, B-3001 Leuven (Belgium); Skryshevski, Yu.; Piryatinski, Yu. [Institute of Physics, National Academy of Science of Ukraine, Kiev 03028 (Ukraine); Beinik, I.; Teichert, C. [Institute of Physics, University of Leoben, A-8700 Leoben (Austria); Hernandez-Sosa, G.; Sitter, H. [Institute of Semiconductor and Solid State Physics, University of Linz, A-4040 Linz (Austria); Andreev, A. [Nanoindent Technologies AG, A-4020 Linz (Austria); Frank, P.; Winkler, A. [Graz University of Technology, A-8010 Graz (Austria)

2009-02-28

477

An Apparatus to Control and Monitor the Para-D2 Concentration in a Solid Deuterium, Superthermal Source of Ultra-cold Neutrons  

E-print Network

Controlling and measuring the concentration of para-D2 is an essential step toward realizing solid deuterium as an intense ultra-cold neutron (UCN) source. To this end, we implemented an experimental technique to convert para- to ortho-deuterium molecules by flowing D2 gas through a cryogenic cell filled with paramagnetic hydrous ferric oxide granules. This process efficiently reduced the para-D2 concentration from 33.3% to 1.5%. Rotational Raman spectroscopy was applied to measure the residual para-D2 contamination to better than 2 parts in 10^3, and the hydrogen contamination to 1 part in 10^3. We also contrast our optical technique to conventional thermal conductivity measurements of the para-D2 concentration, reporting some of the relevant strengths and weaknesses of our implementation of each technique.

C. -Y. Liu; S. K. Lamoreaux; A. Saunders; D. Smith; A. R. Young

2003-07-09

478

Laparoscopic Extraperitoneal Para-aortic Lymphadenectomy in Locally Advanced Cervical Cancer: A Prospective Correlation of Surgical Findings with PET/CT Findings  

PubMed Central

Background Failure to detect metastasis to para-aortic nodes in patients with locally advanced cervical cancer leads to suboptimal treatment. No previous studies have prospectively compared PET/CT with laparoscopic extraperitoneal staging in the evaluation of para-aortic lymph nodes. Methods Sixty-five patients were enrolled; 60 were available for analysis. Patients with stage IB2-IVA cervical cancer without evidence of para-aortic lymphadenopathy on preoperative CT or MRI were prospectively enrolled. All patients underwent preoperative PET/CT. Laparoscopic extraperitoneal lymphadenectomy was performed from the common iliac vessels to the left renal vein. Results The median age at diagnosis was 48 years (range, 23-84). The median operative time was 140 minutes (range, 89-252). The median blood loss was 22.5 ml (range, 5-150). The median length of hospital stay was 1 day (range, 0-4). The median number of lymph nodes retrieved was 11 (range, 1-39). Fourteen patients (23%) had histopathologically positive para-aortic nodes. Of the 26 patients with negative pelvic and para-aortic nodes on PET/CT, 3 (12%) had histopathologically positive para-aortic nodes. Of the 27 patients with positive pelvic but negative para-aortic nodes on PET/CT, 6 (22%) had 4 histopathologically positive para-aortic nodes. The sensitivity and specificity of PET/CT in detecting positive para-aortic nodes when nodes were negative on CT or MRI were 36% and 96%, respectively. Eleven patients (18.3%) had a treatment modification based on surgical findings. Conclusion Laparoscopic extraperitoneal para-aortic lymphadenectomy is safe and feasible. Surgical staging of patients with locally advanced cervical cancer should be considered prior to planned radiation and chemotherapy. PMID:21509770

Ramirez, Pedro T.; Jhingran, Anuja; Macapinlac, Homer A.; Euscher, Elizabeth D.; Munsell, Mark F.; Coleman, Robert L.; Soliman, Pamela T.; Schmeler, Kathleen M.; Frumovitz, Michael; Ramondetta, Lois M.

2014-01-01

479

Membrane Potential-Dependent Inhibition of the Na+,K+-ATPase by para-Nitrobenzyltriethylammonium Bromide  

PubMed Central

Membrane potential (VM)-dependent inhibitors of the Na+,K+-ATPase are a new class of compounds that may have inherent advantages over currently available drugs targeting this enzyme. However, two questions remain unanswered regarding these inhibitors: (1) what is the mechanism of VM-dependent Na+,K+-ATPase inhibition, and (2) is their binding affinity high enough to consider them as possible lead compounds? To address these questions, we investigated how a recently synthesized VM-dependent Na+,K+-ATPase inhibitor, para-nitrobenzyltriethylamine (pNBTEA), binds to the enzyme by measuring the extracellular pNBTEA concentration and VM dependence of ouabain-sensitive transient charge movements in whole-cell patch-clamped rat cardiac ventricular myocytes. By analyzing the kinetics of charge movements and the steady-state distribution of charge, we show that the VM-dependent properties of pNBTEA binding differ from those for extracellular Na+ and K+ binding, even though inhibitor binding is competitive with extracellular K+. The data were also fit to specific models for pNBTEA binding to show that pNBTEA binding is a rate-limiting VM-dependent reaction that, in light of homology models for the Na+,K+-ATPase, we interpret as a transfer reaction of pNBTEA from a peripheral binding site in the enzyme to a site near the known K+ coordination sites buried within the transmembrane helices of the enzyme. These models also suggest that binding occurs with an apparent affinity of 7 ?M. This apparent binding affinity suggests that high-affinity VM-dependent Na+,K+-ATPase inhibitors should be feasible to design and test as specific enzyme inhibitors. PMID:22456853

Peluffo, R. Daniel

2012-01-01

480

Liquid chromatographic determination of para-toluenesulfonamide in edible fillet tissues from three species of fish  

USGS Publications Warehouse

Chloramine-T (N-sodium-N-chloro-p-toluene-sulfonamide) is a candidate therapeutic drug for treating bacterial gill disease, a predominant disease of a variety of fish species. Research has been initiated to obtain the U.S. Food and Drug Administration's (FDA) approval for the use of chloramine-T on a variety of fish species. An attribute of a therapeutic aquaculture drug that must be characterized before the FDA approves its use is depletion of the drug's marker residue (the drug's parent compound or metabolite of highest concentration in an edible tissue). Para-Toluenesulfonamide (p-TSA) is the primary degradation product and marker residue for chloramine-T in rainbow trout. To conduct residue depletion studies for chloramine-T in fish, a robust analytical method sensitive and specific for p-TSA residues in edible fillet tissue from a variety of fish was required. Homogenized fillet tissues from rainbow trout (Oncorhynchus mykiss), walleye (Stizostedion vitreum), and channel catfish (Ictalurus punctatus) were fortified at nominal p-TSA concentrations of 17, 67, 200, 333, and 1000 ng/g. Samples were analyzed by isocratic reversed-phase liquid chromatography (LC) with absorbance detection at 226 nm. Mean recoveries of p-TSA ranged from 77 to 93.17%; relative standard deviations ranged from 1.5 to 14%; method quantitation limits ranged from 13 to 18 ng/g; and method detection limits ranged from 3.8 to 5.2 ng/g. The LC parameters produced p-TSA peaks without coelution of endogenous compounds and excluded chromatographic interference from at least 20 chemicals and drugs of potential use in aquaculture.

Meinertz, J.R.; Schmidt, L.J.; Stehly, G.R.; Gingerich, W.H.

1999-01-01

481

para-Functionalized aryl-di-tert-butylfluorosilanes as potential labeling synthons for (18)F radiopharmaceuticals.  

PubMed

Broad spectrum: Novel para-functionalized aryl-di-tert-butylfluorosilanes, p-(tBu(2)FSi)C(6)H(4)X (X=functional group), have been made available and broaden the spectrum of silicon-based (18)F acceptors (SiFAs) for potential PET applications. For example, the [(18)F]maleimido derivative 1 has been employed for the synthesis of [(18)F]1- labeled rat serum albumin (RSA), the applicability of which for PET has been verified by in vivo experiments.The syntheses of the functionalized triorganofluorosilanes tBu(2)(p-XC(6)H(4))SiF (3 a, X=SH; 4 a, X=NCS; 4 b, X=NCO; 5, X=NC(4)H(2)O(2); 7, X=COOH; 8 a, X=COONC(4)H(4)O(2); 8 b, X=COOC(6)F(5)) are reported. These compounds display potential as silicon-based fluoride acceptors (SiFAs). The molecular structures of compounds 5, 7, and 8 a have been determined by single-crystal X-ray diffraction studies. With the exception of compounds 8 a and 8 b, all of the compounds could be (18)F-labeled by isotopic exchange in good to high radiochemical yields (RCY) with good to excellent specific activities. As proof of applicability, the maleimido-functionalized SiFA derivative 5, which is specific for thiol groups, has been used for the labeling of rat serum albumin (RSA) that had been derivatized with 2-iminothiolane. The incorporation of [(18)F]5 into the derivatized RSA reached a maximum yield after 30 min at ambient temperature. After purification, the [(18)F]RSA was evaluated in a healthy rat by means of muPET and displayed an expedient in vivo stability over 180 min. PMID:19156812

Iovkova, Ljuba; Wängler, Björn; Schirrmacher, Esther; Schirrmacher, Ralf; Quandt, Gabriele; Boening, Guido; Schürmann, Markus; Jurkschat, Klaus

2009-01-01

482

Para-aminobenzoic acid (PABA) synthase enhances thermotolerance of mushroom Agaricus bisporus.  

PubMed

Most mushrooms are thermo-sensitive to temperatures over 23°C, which greatly restricts their agricultural cultivation. Understanding mushroom's innate heat-tolerance mechanisms may facilitate genetic improvements of their thermotolerance. Agaricus bisporus strain 02 is a relatively thermotolerant mushroom strain, while strain 8213 is quite thermo-sensitive. Here, we compared their responses at proteomic level to heat treatment at 33°C. We identified 73 proteins that are differentially expressed between 02 and 8213 or induced upon heat stress in strain 02 itself, 48 of which with a known identity. Among them, 4 proteins are constitutively more highly expressed in 02 than 8213; and they can be further upregulated in response to heat stress in 02, but not in 8213. One protein is encoded by the para-aminobenzoic acid (PABA) synthase gene Pabs, which has been shown to scavenge the reactive oxygen species in vitro. Pabs mRNA and its chemical product PABA show similar heat stress induction pattern as PABA synthase protein and are more abundant in 02, indicating transcriptional level upregulation of Pabs upon heat stress. A specific inhibitor of PABA synthesis impaired thermotolerance of 02, while exogenous PABA or transgenic overexpression of 02 derived PABA synthase enhanced thermotolerance of 8213. Furthermore, compared to 8213, 02 accumulated less H2O2 but more defense-related proteins (e.g., HSPs and Chitinase) under heat stress. Together, these results demonstrate a role of PABA in enhancing mushroom thermotolerance by removing H2O2 and elevating defense-related proteins. PMID:24614118

Lu, Zhonglei; Kong, Xiangxiang; Lu, Zhaoming; Xiao, Meixiang; Chen, Meiyuan; Zhu, Liang; Shen, Yuemao; Hu, Xiangyang; Song, Siyang

2014-01-01

483

Environmental Levels of para-Nonylphenol Are Able to Affect Cytokine Secretion in Human Placenta  

PubMed Central

Background para-Nonylphenol (p-NP) is a metabolite of alkylphenols widely used in the chemical industry and manufacturing. It accumulates in the environment, where it acts with estrogen-like activity. We previously showed that p-NP acts on human placenta by inducing trophoblast differentiation and apoptosis. Objective The aim of the present study was to investigate the effect of p-NP on cytokine secretion in human placenta. Methods In vitro cultures of chorionic villous explants from human placenta in the first trimester of pregnancy were treated with p-NP (10?13, 10?11, and 10?9 M) in 0.1% ethanol as vehicle. Culture medium was collected after 24 hr and assayed by specific immunoassays for the cytokines granulocyte-macrophage colony-stimulating factor (GM-CSF), interferon-? (IFN-?), interleukin (IL)-1?, IL-2, IL-4, IL-5, IL-6, IL-8, IL-10, and tumor necrosis factor-? (TNF-?). Results p-NP modulated cytokine secretion by inducing the release of GM-CSF, IFN-?, IL-1?, IL-4, and IL-10, with a maximum effect at 10?11 M. It reduced the release of TNF-? at 10?13 M, whereas levels of IL-2 and IL-5 remained below the detection limit. IL-6 and IL-8 levels were 100–1,000 times higher than those of other cytokines, and they were not affected by p-NP. We observed significant differences from controls (ethanol alone) only for GM-CSF and IL-10. Conclusion An unbalanced cytokine network at the maternal–fetal interface may result in implantation failure, pregnancy loss, or other complications. The effects of extremely low doses of p-NP on the placental release of cytokines raise considerable concerns about maternal exposure to this endocrine disruptor during pregnancy. PMID:20194071

Bechi, Nicoletta; Ietta, Francesca; Romagnoli, Roberta; Jantra, Silke; Cencini, Marco; Galassi, Gianmichele; Serchi, Tommaso; Corsi, Ilaria; Focardi, Silvano; Paulesu, Luana

2010-01-01

484

Tyrosine-lipid peroxide adducts from radical termination: para coupling and intramolecular Diels-Alder cyclization.  

PubMed

Free radical co-oxidation of polyunsaturated lipids with tyrosine or phenolic analogues of tyrosine gave rise to lipid peroxide-tyrosine (phenol) adducts in both aqueous micellar and organic solutions. The novel adducts were isolated and characterized by 1D and 2D NMR spectroscopy as well as by mass spectrometry (MS). The spectral data suggest that the polyunsaturated lipid peroxyl radicals give stable peroxide coupling products exclusively at the para position of the tyrosyl (phenoxy) radicals. These adducts have characteristic (13)C chemical shifts at 185 ppm due to the cross-conjugated carbonyl of the phenol-derived cyclohexadienone. The primary peroxide adducts subsequently undergo intramolecular Diels-Alder (IMDA) cyclization, affording a number of diastereomeric tricyclic adducts that have characteristic carbonyl (13)C chemical shifts at ~198 ppm. All of the NMR HMBC and HSQC correlations support the structure assignments of the primary and Diels-Alder adducts, as does MS collision-induced dissociation data. Kinetic rate constants and activation parameters for the IMDA reaction were determined, and the primary adducts were reduced with cuprous ion to give a phenol-derived 4-hydroxycyclohexa-2,5-dienone. No products from adduction of peroxyls at the phenolic ortho position were found in either the primary or cuprous reduction product mixtures. These studies provide a framework for understanding the nature of lipid-protein adducts formed by peroxyl-tyrosyl radical-radical termination processes. Coupling of lipid peroxyl radicals with tyrosyl radicals leads to cyclohexenone and cyclohexadienone adducts, which are of interest in and of themselves since, as electrophiles, they are likely targets for protein nucleophiles. One consequence of lipid peroxyl reactions with tyrosyls may therefore be protein-protein cross-links via interprotein Michael adducts. PMID:21090613

Shchepin, Roman; Möller, Matias N; Kim, Hye-young H; Hatch, Duane M; Bartesaghi, Silvina; Kalyanaraman, Balaraman; Radi, Rafael; Porter, Ned A

2010-12-15

485

Experimental and theoretical investigation of 5-para-nitro-benzylidene-thiazolidine-2-thione-4-one molecule  

NASA Astrophysics Data System (ADS)

Experimental methods (FT-IR, Raman and NMR spectroscopies, and X-ray diffraction technique) coupled with quantum chemical calculations based on density functional theory (DFT) are used for structural and electronic characterization of 5-para-nitro-benzylidene-thiazolidine-2-thione-4-one (5pN-BTT). X-ray diffraction technique indicates that this compound crystallizes with one tetrahydrofuran (THF) solvent molecule, forming a 1:1 5pN-BTT·THF complex, in the monoclinic space group C2/ c, with Z = 8 and cell parameters a = 29.496(9) Å, b = 7.276(2) Å, c = 14.873(4) Å, ? = 90.0°, ? = 95.161(6)° and ? = 90.0°. The lowest energy optimized geometry of the investigated compound in gas-phase corresponds to thionic tautomer being consistent with that obtained by X-ray technique. Tautomeric equilibrium between the thione, thiol and enol forms of the compound have been considered and analyzed by theoretical methods. The continuum PCM solvation model fails to reproduce the experimental chemical shift associated with the NH proton in the thione form, but a very good correlation between experiment and theory was obtained by taking into account the specific solute-solvent interactions. Proton NMR spectrum of 5pN-BTT in DMSO solution shows an unexpected proton chemical shift at 14 ppm which is attributed to the proton bound to the nitrogen atom and explained by assuming a relatively strong hydrogen bond between 5pN-BTT and the solvent molecule, realized through NH group. The molecular vibrations of 5pN-BTT were investigated by FT-IR and FT-Raman spectroscopies and the vibrational spectrum of the solid state 5pN-BTT compound has been assigned based on DFT calculations at B3LYP level of theory using the standard 6-31G(d) basis set.

Pîrn?u, Adrian; Chi?, Vasile; Szabo, Laszlo; Cozar, Onuc; Vasilescu, Mihai; Oniga, Ovidiu; Varga, Richard A.

2009-04-01

486

Chelation therapy of manganese intoxication with para-aminosalicylic acid (PAS) in Sprague-Dawley rats.  

PubMed

Para-aminosalicylic acid (PAS), an FDA-approved anti-tuberculosis drug, has been used successfully in the treatment of severe manganese (Mn)-induced Parkinsonism in humans [Jiang Y-M, Mo X-A, Du FQ, Fu X, Zhu X-Y, Gao H-Y, et al. Effective treatment of manganese-induced occupational Parkinsonism with p-aminosalicylic acid: a case of 17-year follow-up study. J Occup Environ Med 2006;48:644-9]. This study was conducted to explore the capability of PAS in reducing Mn concentrations in body fluids and tissues of Mn-exposed animals. Sprague-Dawley rats received daily intraperitoneally (i.p.) injections of 6mg Mn/kg, 5 days/week for 4 weeks, followed by a daily subcutaneously (s.c.) dose of PAS (100 and 200mg/kg as the PAS-L and PAS-H group, respectively) for another 2, 3 or 6 weeks. Mn exposure significantly increased the concentrations of Mn in plasma, red blood cells (RBC), cerebrospinal fluid (CSF), brain and soft tissues. Following PAS-H treatment for 3 weeks, Mn levels in liver, heart, spleen and pancreas were significantly reduced by 25-33%, while 3 weeks of PAS-L treatment did not show any effect. Further therapy with PAS-H for 6 weeks reduced Mn levels in striatum, thalamus, choroid plexus, hippocampus and frontal cortex by 16-29% (p<0.05). Mn exposure greatly increased iron (Fe) and copper (Cu) concentrations in CSF, brain and liver. Treatment with PAS-H restored Fe and Cu levels comparable with control. These data suggest that PAS likely acts as a chelating agent to mobilize and remove tissue Mn. A high-dose and prolonged PAS treatment appears necessary for its therapeutic effectiveness. PMID:19150464

Zheng, Wei; Jiang, Yue-Ming; Zhang, Yanshu; Jiang, Wendy; Wang, Xueqian; Cowan, Dallas M

2009-03-01

487

Chelation Therapy of Manganese Intoxication with para-Aminosalicylic Acid (PAS) in Sprague-Dawley Rats  

PubMed Central

Para-aminosalicylic acid (PAS), an FDA-approved anti-tuberculosis drug, has been used successfully in the treatment of severe manganese (Mn)-induced Parkinsonism in humans (Jiang et al., JOEM 48:644, 2006). This study was conducted to explore the capability of PAS in reducing Mn concentrations in body fluids and tissues of Mn-exposed animals. Sprague-Dawley rats received daily intraperitoneally (i.p.) injections of 6 mg Mn/kg, 5 d/wk for 4 wks, followed by a daily subcutaneously (sc.) dose of PAS (100 and 200 mg/kg as the PAS-L and PAS-H group, respectively) for another 2, 3 or 6 wks. Mn exposure significantly increased the concentrations of Mn in plasma, red blood cells (RBC), cerebrospinal fluid (CSF), brain and soft tissues. Following PAS-H treatment for 3 wks, Mn levels in liver, heart, spleen and pancreas were significantly reduced by 25 to 33%, while 3 wks of PAS-L treatment did not show any effect. Further therapy with PAS-H for 6 wk reduced Mn levels in striatum, thalamus, choroid plexus, hippocampus and frontal cortex by 16 to 29% (p<0.05). Mn exposure greatly increased iron (Fe) and copper (Cu) concentrations in CSF, brain and liver. Treatment with PAS-H restored Fe and Cu levels comparable with control. These data suggest that PAS likely acts as a chelating agent to mobilize and remove tissue Mn. A high-dose and prolonged PAS treatment appears necessary for its therapeutic effectiveness. PMID:19150464

Zheng, Wei; Jiang, Yue-Ming; Zhang, Yanshu; Jiang, Wendy; Wang, Xueqian; Cowan, Dallas M.

2008-01-01

488

Genes, Enzymes, and Regulation of para-Cresol Metabolism in Geobacter metallireducens? †  

PubMed Central

In aerobic and facultatively anaerobic bacteria, the degradation of para-cresol (p-cresol) involves the initial hydroxylation to p-hydroxybenzyl alcohol by water catalyzed by the soluble, periplasmatic flavocytochrome p-cresol methylhydroxylase (PCMH; ?2?2 composition). In denitrifying bacteria the further metabolism proceeds via oxidation to p-hydroxybenzoate, the formation of p-hydroxybenzoyl-coenzyme A (CoA), and the subsequent dehydroxylation of the latter to benzoyl-CoA by reduction. In contrast, the strictly anaerobic Desulfobacterium cetonicum degrades p-cresol by addition to fumarate, yielding p-hydroxybenzylsuccinate. In this work, in vitro enzyme activity measurements revealed that the obligately anaerobic Geobacter metallireducens uses the p-cresol degradation pathway of denitrifying bacteria. Surprisingly, PCMH, which is supposed to catalyze both p-cresol hydroxylation and p-hydroxybenzyl alcohol oxidation to the corresponding aldehyde, was located in the membrane fraction. The ? subunit of the enzyme was present in two isoforms, suggesting an ????2 composition. We propose that the unusual asymmetric architecture and the membrane association of PCMH might be important for alternative electron transfer routes to either cytochrome c (in the case of p-cresol oxidation) or to menaquinone (in the case of p-hydroxybenzyl alcohol oxidation). Unusual properties of further enzymes of p-cresol metabolism, p-hydroxybenzoate-CoA ligase, and p-hydroxybenzoyl-CoA reductase were identified and are discussed. A proteomic approach identified a gene cluster comprising most of the putative structural genes for enzymes involved in p-cresol metabolism (pcm genes). Reverse transcription-PCR studies revealed a different regulation of transcription of pcm genes and the corresponding enzyme activities, suggesting the presence of posttranscriptional regulatory elements. PMID:17449613

Peters, Franziska; Heintz, Dimitri; Johannes, Jörg; van Dorsselaer, Alain; Boll, Matthias

2007-01-01

489

X-ray photoelectron spectroscopy study of para-substituted benzoic acids chemisorbed to aluminum oxide thin films  

SciTech Connect

A series of para-substituted, halogenated (F, Cl, Br, and I) benzoic acid monolayers were prepared on the native oxide of aluminum surfaces by solution self-assembly and spin-coating techniques. The monolayers were characterized by x-ray photoelectron spectroscopy (XPS) and water contact angles. Several general trends are apparent. First, the polarity of the solvent is critical to monolayer formation. Protic polar solvents produced low coverage monolayers; in contrast, nonpolar solvents produced higher coverage monolayers. Second, solution deposition yields a higher surface coverage than spin coating. Third, the thickness of the monolayers determined from XPS suggests the plane of the aromatic ring is perpendicular to the surface with the carboxylate functional group most likely binding in a bidentate chelating geometry. Fourth, the saturation coverage (?2.7 × 10{sup 14} molecules cm{sup ?2}) is independent of the para-substituent.

Kreil, Justin; Ellingsworth, Edward; Szulczewski, Greg [Department of Chemistry, The University of Alabama, Shelby Hall, 250 Hackberry Lane, Tuscaloosa, Alabama 35487 (United States)] [Department of Chemistry, The University of Alabama, Shelby Hall, 250 Hackberry Lane, Tuscaloosa, Alabama 35487 (United States)

2013-11-15

490

Trends in electron-ion dissociative recombination of benzene analogs with functional group substitutions: Negative Hammett ?para values  

NASA Astrophysics Data System (ADS)

An in-depth study of the effects of functional group substitution on benzene's electron-ion dissociative recombination (e-IDR) rate constant has been conducted. The e-IDR rate constants for benzene, biphenyl, toluene, ethylbenzene, anisole, phenol, and aniline have been measured using a Flowing Afterglow equipped with an electrostatic Langmuir probe (FALP). These measurements have been made over a series of temperatures from 300 to 550 K. A relationship between the Hammett ?para values for each compound and rate constant has indicated a trend in the e-IDR rate constants and possibly in their temperature dependence data. The Hammett ?para value is a method to describe the effect a functional group substituted to a benzene ring has upon the reaction rate constant.

Osborne, David; Lawson, Patrick Andrew; Adams, Nigel; Dotan, Itzhak

2014-06-01

491

Se da a conocer el plan del Instituto Nacional del Cáncer para acelerar la investigación del cáncer  

Cancer.gov

En la 100va Reunión Anual de la Asociación Estadounidense de Investigación del Cáncer realizada en Denver, el director del Instituto Nacional del Cáncer, doctor John E. Niederhuber, dio a conocer detalles importantes, tales como financiamiento de más subvenciones, creación de una plataforma para atención personalizada del cáncer y un programa acelerado de genética del cáncer que hará avanzar la investigación oncológica en este nuevo ambiente económico.

492

Electron diffraction study on monolayer LB films of liquid-crystalline polyacrylate containing para-nitro azobenzene  

Microsoft Academic Search

Monolayers of liquid-crystalline polyacrylate containing para-nitro azobenzene (HP6) on the water subphase were characterized by the surface pressure (?)-area per monomer unit (A) isotherm and were successfully transferred onto glass substrates by the vertical lifting method. The monolayer Langmuir-Blodgett (LB) films transferred at different surface pressures were studied by electron diffraction. The thickness of the monolayer LB film was measured

Min Li; Enle Zhou; Xinping Wang; Jiping Xu

1995-01-01

493

Suporte para vistas em ambientes de gesto de rede Palavras chave: Vistas, Gesto de Rede, CRC2000.  

E-print Network

1 Suporte para vistas em ambientes de gestão de rede Palavras chave: Vistas, Gestão de Rede, CRC2000. Resumo Em sistemas de gestão de redes, uma vista representa uma perspectiva parcelar do universo sistema Scotty, uma conhecida plataforma de gestão de rede de domínio público. I. Introdução A grande

Rodrigues, Luís E.T.

494

APLICAO DE AGENTES MVEIS EM REDES DE SENSORES SEM FIO PARA LOCALIZAO E SEGUIMENTO DE OBJETOS ALVOS MVEIS  

E-print Network

APLICA��O DE AGENTES M�VEIS EM REDES DE SENSORES SEM FIO PARA LOCALIZA��O E SEGUIMENTO DE OBJETOS sistema embarcado baseada em uma aplicação de localização e seguimento de objeto alvo utilizando redes de sensores sem fio (RSSF). Sendo os nós da rede fixos, realiza-se o seguimento do alvo utilizando agentes

Wagner, Flávio Rech

495

La UA dirige un programa para prevenir conductas adictivas en los ms jvenes a travs del deporte  

E-print Network

La UA dirige un programa para prevenir conductas adictivas en los más jóvenes a través del deporte Deporte de la Facultad de Educación de la Universidad de Alicante, junto al área de Igualdad y Juventud de fomentar un desarrollo positivo de los jóvenes a través del deporte. Esta iniciativa cosiste en dotar de

Escolano, Francisco

496

Los programas educativos del Texas AgriLife Extension Service estn disponibles para todas las personas, sin distin-  

E-print Network

inscripción? Examen de certifcación ANSI-CFP de geren- te de servicio de alimentos El libro del curso Gerentes de Servicio de Alimentos llevadoGerentes de Servicio de Alimentos llevado a cabo por Extensión:eneseñará a gerentes acerca de: Satisface los requisitos del estado para ser un gerente de servicio de alimentos

497

The Latin Music Database: Uma Base de Dados Para a Classificac~ao Automatica de G^eneros Musicais  

E-print Network

The Latin Music Database: Uma Base de Dados Para a Classificac¸~ao Autom´atica de G^eneros Musicais Carlos N. Silla Jr.1 , Celso A. A. Kaestner2 , Alessandro L. Koerich1 1 Pontif´icia Universidade Cat@utfpr.edu.br, alekoe@ppgia.pucpr.br Abstract. In this paper we present the Latin Music Database, a novel database

Kent, University of

498

Estudios en la Zona no Saturada del Suelo. Vol X ALGORITMO MECANSTICO SIMPLIFICADO PARA LA CUANTIFICACIN DEL EFECTO DE UN  

E-print Network

encharcamiento del suelo y balance de agua durante un hietograma de lluvia natural. El modelo se contrasta se estudia la extensión de la ecuación de Green-Ampt para la infiltración de agua en presencia de un nivel freático somero estable bajo condiciones de lluvia natural, y su efecto sobre la redistribución de

Boyer, Edmond

499

Solvatochromism and preferential solvation of para-derivatives of guaiacol in water-N,N-dimethylformamide mixtures  

NASA Astrophysics Data System (ADS)

The influence of the composition of the water-N,N-dimethylformamide mixed solvent on the position of the B absorption band in UV spectra of 2-methoxyphenol, its para-substituted derivatives, and corresponding phenolate anions simulating base units of natural lignin is investigated. The data obtained are interpreted in terms of the model of preferential solvation. The preferential solvation parameters and compositions of the solvation shells are calculated.

Kosyakov, D. S.; Gorbova, N. S.; Bogolitsyn, K. G.; Gusakov, L. V.

2007-07-01

500

Standardization of Spanish Shipbuilding:Ordenanzas para la Fabrica de Navios de Guerra y Mercante - 1607,1613,1618  

E-print Network

STANDARDIZATION OF SPANISH SHIPBUILDING: ORDENANZAS PARA LA F?BRICA DE NAV?OS DE GUERRA Y MERCANTE ? 1607, 1613, 1618 A Thesis by BLANCA MARGARITA RODR?GUEZ MENDOZA Submitted to the Office of Graduate Studies of Texas A..., 1613, 1618 A Thesis by BLANCA MARGARITA RODR?GUEZ MENDOZA Submitted to the Office of Graduate Studies of Texas A&M University in partial fulfillment of the requirements for the degree of MASTER OF ARTS Approved by: Chair of Committee...

Rodriguez Mendoza, Blanca Margarita

2009-05-15