Evaluation of Salud Para Su Corazón (Health for your Heart) -- National Council of La Raza Promotora Outreach Program.

PubMed

Balcázar, Héctor; Alvarado, Matilde; Hollen, Mary Luna; Gonzalez-Cruz, Yanira; Pedregón, Verónica

2005-07-01

In 2001, the National Heart, Lung, and Blood Institute partnered with the National Council of La Raza to conduct a pilot test of its community-based outreach program Salud Para Su Corazón (Health for Your Heart), which aims to reduce the burden of morbidity and mortality associated with cardiovascular disease among Latinos. The effectiveness of promotores de salud (community health workers) in improving heart-healthy behaviors among Latino families participating in the pilot program at seven sites was evaluated. Data on the characteristics of the promotores in the Salud Para Su Corazón program were compiled. Promotores collected data on family risk factors, health habits, referrals and screenings, information sharing, and program satisfaction from 223 participating Latino families (320 individual family members) through questionnaires. Paired t tests and chi-square tests were used to measure pretest-posttest differences among program participants. Results demonstrated the effectiveness of the promotora model in improving heart-healthy behaviors, promoting community referrals and screenings, enhancing information sharing beyond families, and satisfying participants' expectations of the program. The main outcome of interest was the change in heart-healthy behaviors among families. The community outreach model worked well in the seven pilot programs because of the successes of the promotores and the support of the community-based organizations. Successes stemmed in part from the train-the-trainer approach. Promotoria, as implemented in this program, has the potential to be integrated with a medical model of patient care for primary, secondary, and tertiary prevention.

Bases para la elaboracion de unidades didacticas de calidad en el area de ciencias (Fisica y Quimica 3 deg ESO)

NASA Astrophysics Data System (ADS)

Maccioni, Elena Lucia

Este Trabajo Fin de Master tiene como objeto, el estudio previo de la educacion de la ciencia en la actualidad y mas destacable, del diseno de las unidades didacticas segun las metodologias mas frecuentes aplicadas por los diferentes sistemas educativos en el area de las Ciencias teniendo en cuenta la importancia y el efecto de la psicologia del alumnado y todo ello como no puede ser de otro modo bajo el corse de la Legislacion aplicable, Estatal, Autonomica y europea. Con estos antecedentes, se extrae cuales son las preguntas que deben contestarse en la elaboracion de una unidad didactica de calidad en el contexto, generacional (edad y sexo), del Proyecto Educativo de Centro, y de la Programacion del Departamento, discutiendo y justificando cada uno de los apartados en que estructuradamente dividiremos dicha Unidad, con un formato manejable, util, y dinamico en el tiempo que sea un verdadero instrumento educativo de aula. Teniendo en cuenta estas premisas, se procede a hacer una recopilacion de una misma unidad didactica publicada por diferentes editoriales, elegidas no al azar, sino en funcion de su penetracion editorial en nuestros centros de ESO, siendo las elegidas (SM y Oxford). Las diferentes unidades seleccionadas son analizadas de forma critica, atendiendo a los criterios generales de calidad bajo parametros cientificos y normativos, concluyendo con la aportacion final que es la redaccion de unas pautas cientifico-pedagogicas, para redactar unidades didacticas de calidad en el area de la Ciencias, en concreto en la Asignatura de Fisica y Quimica de 3º de ESO.

Concepciones y concepciones alternativas de estudiantes universitarios/as de biologia y futuros maestros/as de Ciencia de escuela secundaria sobre la teoria de evolucion biologica por seleccion natural

NASA Astrophysics Data System (ADS)

Morales Ramos, Egda M.

La teoria de evolucion biologica (TEB) por seleccion natural es uno de los conceptos unificadores mas importantes del curriculo de Biologia. En Puerto Rico se han hecho pocas investigaciones que abunden sobre las concepciones y concepciones alternativas (CA) que tienen los estudiantes universitarios/as de Biologia y los maestros/as de Ciencia del nivel secundario sobre esta teoria. La politica publica educativa actual establece mediante documentos normativos como los Estandares de contenido y Expectativas de grado del Programa de Ciencias [Puerto Rico Core Standards] la ensenanza de esta teoria. Sin embargo, no se encontraron preguntas sobre la seleccion natural en los ejercicios de practica provistos por el Departamento de Educacion para las pruebas estandarizadas lo cual puede influir para que no se ensene adecuadamente. Las preguntas de investigacion fueron 1. ¿Cuales son las concepciones y concepciones alternativas de estudiantes universitarios/as y de los futuros maestros y maestras de Ciencia sobre la TEB? 2. ¿Cuales conceptos que seleccionan los estudiantes universitarios/as y los futuros maestros y maestras de Ciencia sobre la TEB coinciden con lo aceptado como valido por la comunidad cientifica? y 3. ¿Como comparan las respuestas de la prueba original. v. Entendiendo el cambio biologico que mide concepciones y CA sobre la TEB por seleccion natural, con las de la traducida al idioma espanol? Se utilizo el metodo cuantitativo con un diseno de investigacion transversal por encuesta. La tecnica principal para recopilar los datos fue una prueba con doce items, que formo parte de un instrumento para el cual se recopilaron diversas fuentes de evidencia acerca de su validez. Las muestras estuvieron formadas por 69 estudiantes de Ciencias Naturales y por 16 estudiantes futuros maestros y maestras del nivel secundario de la UPR-RP. Se utilizaron estadisticas descriptivas, analisis de Ji cuadrado y se calcularon los coeficientes alfa de Cronbach y de Spearman

Nominalizations in Spanish. Studies in Linguistics and Language Learning, Volume V.

ERIC Educational Resources Information Center

Falk, Julia Sableski

Using methods developed in transformational generative grammar, three types of nominal constructions in Spanish are treated in this paper: Fact nominalizations ("[El] Escribir es agradable"), Manner nominalizations ("El tocar [de la mujer] es agradable"), and Abstract noun nominalizations ("La construccion rapida de esta escuela es dudosa"). While…

[Strategic planning models at the Instituto Nacional de Ciencias Médicas y Nutrición Salvador Zubirán].

PubMed

Velázquez-Pastrana, Ruth

2013-01-01

The Instituto Nacional de Ciencias Médicas y Nutrición Salvador Zubirán (Spanish acronym INCMNSZ) is a third tier healthcare facility operated by the Mexican Ministry of Health, ando ver the years various strategic planning models have been used in its development. This paper present a brief overview of some of those strategic planning models and their application and concludes with a discussion of the lessons learned and challenges than remain.

Depth Extraction from Videos Using Geometric Context and Occlusion Boundaries (Open Access)

DTIC Science & Technology

2014-09-05

RAZA ET AL .: DEPTH EXTRACTION FROM VIDEOS 1 Depth Extraction from Videos Using Geometric Context and Occlusion Boundaries S. Hussain Raza1...electronic forms. ar X iv :1 51 0. 07 31 7v 1 [ cs .C V ] 2 5 O ct 2 01 5 2 RAZA ET AL .: DEPTH EXTRACTION FROM VIDEOS Frame Ground Truth Depth...temporal segmentation using the method proposed by Grundmann et al . [4]. estimation and triangulation to estimate depth maps [17, 27](see Figure 1). In

The type specimens of Tachinidae (Diptera) housed in the Museo Argentino de Ciencias Naturales "Bernardino Rivadavia", Buenos Aires.

PubMed

Mulieri, Pablo Ricardo; Patitucci, Luciano Damián; Bachmann, Axel Oscar; O'Hara, James E

2013-01-01

The type material of species of Tachinidae (Diptera) housed in the collection of the Entomology Division of the Museo Argentino de Ciencias Naturales "Bernardino Rivadavia" were examined and are herein documented. The collection contains 202 type specimens consisting of 54 species described by E.E. Blanchard and 12 described by J. Brèthes. Comparison of their original descriptions with the label information reveals the existence of 24 holotypes, 1 lectotype, 141 syntypes and 36 paratypes. Complete information is given for each type, including reference to the original description, label data, and preservation condition.

77 FR 42229 - Gruma Corporation, Spina Bifida Association, March of Dimes Foundation, American Academy of...

Federal Register 2010, 2011, 2012, 2013, 2014

2012-07-18

... Academy of Pediatrics, Royal DSM N.V., and National Council of La Raza; Filing of Food Additive Petition... Raza had jointly filed a petition proposing that the food additive regulations be amended to provide... corrected to read ``Director, Office of Food Additive Safety, Center for Food Safety and Applied Nutrition...

The reptile type specimens preserved in the Museo Nacional de Ciencias Naturales (CSIC) of Madrid, Spain.

PubMed

García-Díez, Teresa; González-Fernández, José E

2013-01-01

A first complete list of the reptile type specimens preserved in the Museo Nacional de Ciencias Naturales (CSIC) of Madrid (updated until 15 July 2012) is provided. The collection houses a total of 319 type specimens representing 24 taxa belonging to 6 families and 12 genera. There are 22 taxa represented by primary types (19 holotypes, 2 neotypes and 1lectotype) and at least one paratype, and only two taxa are exclusively represented by one secondary type (paratype). The collection is specially rich in Spanish endemisms. Special attention is deserved by the type series of many subspecies of Podarcis lilfordi described by A. Salvador and V. Pdéez-Mellado. All type specimens are housed in the Herpetological collection except Blanus mariae and Psaimodroims occidentalis type series and Psammodroims hispanicus (neotype) which are preserved in the DNA/Tissues Collection.

Ciencia en Acción: a platform for Astronomy

NASA Astrophysics Data System (ADS)

Ros, R. M.

2017-03-01

''Ciencia en Acción'' (CEA) was born in 2000. It was in response to an initiative by CERN, ESA and ESO in order to promote the study of science in Europe. It was not until 2002 when the CEA organization proposed ''Adopta una Estrella'' as a new set of procedures aimed at students of primary and secondary schools with the objective of promoting scientific vocations, in which the speciality of the central axis was astronomy. Students nominate a star or astronomical phenomenon and take on ”ownership” and carry out a research about some interesting aspects concerning the chosen topic. For 14 years ''Adopta una Estrella'' has involved teachers and students from over 15 Spanish or Portuguese speaking countries, and now is one of the most dynamic international forums in order to exchange knowledge among peers in informal education. The selected projects from Spain and Portugal receive travel assistance to attend a final contest, but authors from American participate by means of an online connection. This kind of virtual communication is usually welcomed with enthusiasm by all attendees and is noted for being very exciting. ''Adopta una Estrella'' has been coordinated since its beginning alongside ''Catch a Star'', organized by the EAAE (European Association for Astronomy Education) in collaboration with ESO. The work of our students has achieved many distinctions within this European contest. Up to 2015, 42 awards have been obtained for specific projects as well as for schools or groups of students. ''Adopta una Estrella'' has also the network support offered by the NASE (program of the International Astronomical Union IAU) which involves teachers in more than twenty countries in which it is implemented.

Can a Spanish science education journal become international? the case of Enseñanza de las Ciencias

NASA Astrophysics Data System (ADS)

Espinet, Mariona; Izquierdo, Mercè; Garcia-Pujol, Clara

2015-12-01

In this paper we discuss the case of the science education research journal Enseñanza de las Ciencias (EC) around the issue of its internationalization and the consequences this process has had and is still having on the use and preservation of different languages and more specifically the Castilian (Spanish) language. We first frame the concept of globalization and internationalization, and identify three important dimensions involved in the process of internationalization of EC such as language use, actors involved and resources available. Secondly, we address the historical evolution of EC along three phases of internationalization. In each phase we discuss the tensions experienced in relevant internationalization dimensions focusing particularly on the use of languages. We conclude by advocating a plurilingual and multicultural model for a science education research journal as an alternative to the hegemony of international English written journals. In doing so we want to continue the conversation on the role that local and national science education research journals have in promoting science education around the world.

Nomenclatural notes on the Eurytomids (Chalcidoidea: Eurytomidae) described by Jean Brèthes housed in Museo Argentino de Ciencias Naturales "Bernardino Rivadavia".

PubMed

Gates, Michael W

2014-04-16

Ten Eurytomidae (Hymenoptera) parasitic wasp species described by Jean Brèthes and deposited in the Museo Argentino de Ciencias Naturales in Buenos Aires are treated and their nomenclature stabilized. The condition of the type material is described. Lectotypes are designated for Decatoma cecidosiphaga Brèthes, Prodecatoma parodii Brèthes, Eudecatoma opposita Brèthes, and Eurytoma caridei Brèthes. One new generic synonymy, Xanthosomodes Brèthes with Tetramesa Walker, n. syn., and five new combinations are proposed: Tetramesa albiangulata (Brèthes), n. comb.; Phylloxeroxenus caridei (Brèthes), n. comb.; Aximopsis vulgata (Brèthes), n. comb.; Proseurytoma parodii (Brèthes), n. comb.; and Bruchophagus opposita (Brèthes), n. comb. Sycophila paranensis Brèthes is declared incertae sedis.

Discussions about the Nature of Science in a Course on the History of Astronomy. (Spanish Title: Discusiones sobre la Naturaleza de la Ciencia en un Curso sobre Historia de la Astronomía.) Discussões sobre a Natureza da Ciência em um Curso sobre a História da Astronomia

NASA Astrophysics Data System (ADS)

Pires de Andrade, Victória Flório; L'Astorina, Bruno

2010-07-01

There are an increasing number of researches in science education that affirm the importance of discussions on the "nature of science" in basic education level as well as in teacher training. The history of science applied to education is a way to contextualize epistemological discussions, allowing both the understanding of scientific content and learning about science concepts. We present some reasonably consensual definitions on the nature of science that have been widely discussed by the academic community. We show also some episodes in the history of astronomy which can lead to discussions involving some aspects of the nature of science, and how they can do it. Hay un número creciente de investigaciones en la enseñanza de las ciencias que afirman la importancia de debates sobre la "naturaleza de la ciencia" en la educación básica y formación del profesorado. La historia de la ciencia aplicada a la educación es una manera de contextualizar los debates de la epistemología, lo que permite tanto la comprensión de los contenidos científicos como el aprendizaje de conceptos científicos. En esto trabajo, presentamos algunas definiciones bastante consensuales sobre la naturaleza de la ciencia que han sido ampliamente discutidas por la comunidad académica y mostramos cómo algunos episodios en la historia de la astronomía pueden llevar a discusiones sobre algunos aspectos de la naturaleza de la ciencia. Há um número crescente de pesquisas na área de ensino de ciências que afirmam a importância de discussões sobre a "natureza da ciência" na educação básica e na formação de professores. A história da ciência aplicada ao ensino é uma maneira de contextualizar discussões epistemológicas, permitindo tanto a compreensão de conteúdos científicos quanto o aprendizado de noções sobre as ciências. Neste trabalho apresentamos algumas definições razoavelmente consensuais sobre a natureza da ciência que foram amplamente discutidas pela

The type specimens of sawflies (Hymenoptera: Symphyta) of the Museo Nacional de Ciencias Naturales, Madrid.

PubMed

Taeger, Andreas; París, Mercedes; Nieves-Aldrey, Jose Luis

2014-04-16

The type specimens of sawflies (Hymenoptera: Symphyta) housed in the Museo Nacional de Ciencias Naturales, Madrid, were examined. Lectotypes are designated and illustrated for the following 32 nominal taxa (preserved in the MNCN collection if not stated otherwise): Tenthredo acutiscutis Konow, 1908; Tenthredo aericeps Konow, 1907; Allantus albipectus Konow, 1907; Athalia bolivari Dusmet, 1896; Tristactus punctatus var. candidatus Konow, 1899; Tenthredo capistrata Konow, 1907; Megalodontes capitalatus Konow 1904 (coll. SDEI); Tenthredo casta Konow, 1908; Clydostomus cestatus Konow, 1908; Miocephala chalybea Konow, 1907 (coll. SDEI); Peus cupreiceps Konow, 1907; Metallopeus cupreolus Malaise, 1945 (coll. NHRS); Allantus dusmeti Konow, 1894 (coll. SDEI); Megalodontes dusmeti Enslin, 1914 (coll. ZSM); Megalodontes escalerai Konow, 1899; Tenthredo flavitarsis Konow, 1908; Sciopteryx galerita Konow, 1907; Tenthredo habenata Konow, 1907; Allantus inguinalis Konow, 1908; Clydostomus merceti Konow, 1908; Megalodontes merceti Konow 1904 (coll. SDEI); Tenthredo mordax Konow, 1908; Megalodontes mundus Konow, 1904; Tenthredo nimbata Konow, 1906; Tenthredo oculissima Konow, 1907; Peus pannulosus Konow, 1907; Tenthredo podagrica Konow, 1907; Arge segmentaria var. rufiventris Konow, 1899; Tenthredo rugiceps Konow, 1908; Tenthredo segrega Konow, 1908; Peus splendidus Konow 1907; Tenthredo suta Konow, 1906. Peus cupreiceps Konow, 1907, is considered to be a valid species. New synonymy is proposed for Tenthredo (Metallopeus) cupreiceps (Konow, 1907), comb. nov., spec. rev. (=Metallopeus cupreolus Malaise, 1945, syn. nov.; =Metallopeus inermis Malaise, 1945, syn. nov.). 

Readings on La Raza--The Twentieth Century.

ERIC Educational Resources Information Center

Meier, Matt S., Ed.; Rivera, Feliciano, Ed.

This chronological anthology consists of documents and articles on the history of Mexican American people in the 20th century. The anthology may be directed to students in higher education, historians, and those interested in the Mexican American people. Section I spans the period from 1900 to 1920 and introduces immigration as the starting point…

Critical Race Theory Counterstory as Allegory: A Rhetorical Trope to Raise Awareness about Arizona's Ban on Ethnic Studies

ERIC Educational Resources Information Center

Martinez, Aja Y.

2013-01-01

he critical race counterstory in this essay takes on the form of allegory to raise awareness about Arizona's anti-immigrant/Mexican climate, and pays particular attention to legislation targeted at Tucson Unified School District's Mexican American studies (also RAZA studies) program.

The type-material of Arctiinae (Lepidoptera, Erebidae) described by Burmeister and Berg in the collection of the Museo Argentino de Ciencias Naturales Bernardino Rivadavia (Buenos Aires, Argentina).

PubMed

Beccacece, Hernán M; Vincent, Benoit; Navarro, Fernando R

2014-01-01

Carlos G. Burmeister and Carlos Berg were among the most important and influential naturalists and zoologists in Argentina and South America and described 241 species and 34 genera of Lepidoptera. The Museo Argentino de Ciencias Naturales Bernardino Rivadavia (MACN) housed some of the Lepidoptera type specimens of these authors. In this study we present a catalogue with complete information and photographs of 11 Burmeister type specimens and 10 Berg type specimens of Phaegopterina, Arctiina and Pericopina (Lepidoptera, Erebidae, Arctiinae, Arctiini) housed in the MACN. Lectotypes or holotypes were designated where primary type specimens could be recognized; in some cases we were not able to recognize types. The catalogue also proposes nomenclatural changes and new synonymies: Opharus picturata (Burmeister, 1878), comb. n.; Opharus brunnea Gaede, 1923: 7, syn. n.; Hypocrisias jonesi (Schaus, 1894), syn. n.; Leucanopsis infucata (Berg, 1882), stat. rev.; Paracles argentina (Berg, 1877), sp. rev.; Paracles uruguayensis (Berg, 1886), sp. rev.

The type-material of Arctiinae (Lepidoptera, Erebidae) described by Burmeister and Berg in the collection of the Museo Argentino de Ciencias Naturales Bernardino Rivadavia (Buenos Aires, Argentina)

PubMed Central

Beccacece, Hernán M.; Vincent, Benoit; Navarro, Fernando R.

2014-01-01

Abstract Carlos G. Burmeister and Carlos Berg were among the most important and influential naturalists and zoologists in Argentina and South America and described 241 species and 34 genera of Lepidoptera. The Museo Argentino de Ciencias Naturales Bernardino Rivadavia (MACN) housed some of the Lepidoptera type specimens of these authors. In this study we present a catalogue with complete information and photographs of 11 Burmeister type specimens and 10 Berg type specimens of Phaegopterina, Arctiina and Pericopina (Lepidoptera, Erebidae, Arctiinae, Arctiini) housed in the MACN. Lectotypes or holotypes were designated where primary type specimens could be recognized; in some cases we were not able to recognize types. The catalogue also proposes nomenclatural changes and new synonymies: Opharus picturata (Burmeister, 1878), comb. n.; Opharus brunnea Gaede, 1923: 7, syn. n.; Hypocrisias jonesi (Schaus, 1894), syn. n.; Leucanopsis infucata (Berg, 1882), stat. rev.; Paracles argentina (Berg, 1877), sp. rev.; Paracles uruguayensis (Berg, 1886), sp. rev. PMID:25061380

Genetic study of Andalusia's ovine and caprine breeds.

PubMed

Rodero, E; Haba, M R; Rodero, A

1997-01-12

� differents variables de polymorphism biochimique. Lorsque on fait differences entre troupeau, dedans de races, ou entre elles, on a utilicés differents preuves, á partir des fréquences géniques et génotipiques: l'index de Wright, hétérozygotie moyennes, variances de Whalund, preuve G de raison de probabilité, etc. Aussi le distance de Cavalli-Sforza. Comme conclusion, dans les races Andalusian Black et Grazalema Merino les variances de Whalund obtenues sont cosequences de l'action de la selection, donant different populations avec differentiation spaciale. Les hétérozygoties moyennes de chaque race sont parus, mais lorsque on considérent chaque systéme separé, les differences entre groupes ethniques sont importantes. Les indexes F de Wright demonstrent que, dans le races Andalusian White et Grazalema Merino on peuvent déduire d'heterozygoties génétique entre les populations ou troupeau analicées, dans le race Andalusian Black les differences valeurs de FIS indiquent que, malgré les petites dimensions des populations, on a evité la consanguinitée, due, probablement, á l'entrée d'étalons externes. Il n'y a pas, chez auqune race, d'un signifivative accroissement d'hétérizygosis. Les distances génétiques entre troupeau, dedans des races, en different pas des distances obtenues entre races. RESUMEN: Se ha trabajado con diferentes ganaderias de las razas ovinas andaluzas Merino de Grazalema y Churra Lebrijana, y con las caprinas Blanca Serrana y Negra Serrana, elegidas entre el resto de las razas de Andalucia como prioritarias pra la conservación, por estudio previo (Rodero y col., 1992a). Los sistemas utilizados en este trabajo corresponden tanto a caracteres etnozootécnicos como a diferentes variables de polimorfismos bioquimicos. Cuando se han diferenciado las ganaderias dentrde razas, o las ganaderias entre si, se han utilizado diferentes pruebas, a partir de las frecuencias genéticas y genotipicas: indices de Wright, heterocigosidades media

Clubes de Ciencia: Intensive science workshops in Mexico provide a unique opportunity for teaching, scientific and cultural exchange

NASA Astrophysics Data System (ADS)

Le Bras, I.; Rosengard, S.; Estefania, M.; Jinich, A.

2016-02-01

Clubes de Ciencia, which translates to "Science Clubs" is an initiative started by a group of graduate students at Harvard University in 2014 to encourage scientific exchange between the US and Mexico. These science clubs are one-week long intensive workshops taught by graduate students and/or postdocs on a subject of their choice in six Mexican cities. Instructors apply to teach a workshop by sending a proposal to the organizing committee, who is looking for workshops that emphasize hands-on, practical ideas. The instructors, primarily graduate students in the US, are paired with local co-instructors who assist and often co-teach the workshop. Local student participants, who are in their last two years of high school and the first two years of college, are selected based on their interest and enthusiasm. Each class has about 15-20 students, so that the classroom setting is intimate and interactive Sponsors, who fund instructor stipends, class supplies and program development, include the Mexican department of energy (SENER), the Mexican national science foundation (CONACYT), Harvard and MIT. Host universities also provide space and resources. In this presentation we focus on clubs that were taught in January 2015 on ocean physics and July 2015 on ocean chemistry, both taught in Ensenada, Baja California at the national autonomous university. Both workshops included a combination of data analysis, lectures, experiments and computational modeling. The ocean physics class was also recorded intermittently and is being used as a test case for an online course. The format provided an intensive teaching and networking experience and could be interesting to implement in other contexts.

Desarrollo de una Interfaz de Control para un Observatorio Astronómico Robotizado con fines educativos en la Facultad de Ciencias Exactas; Físicas y Naturales de la UNSJ

NASA Astrophysics Data System (ADS)

Pogrebinsky, L.; Francile, C.

We report the development and the construction of an Interface to Control a robotized Astronomical Observatory (ICOA), which allows to control the operation of an observatory based on a Meade LX200 telescope. The interface operates together with a computer to control and supervise all the local variables of the observatory, and can take the control of it in risky situations. It serves as a link among the control computer and all the necessary devices for the astronomical observation such as the telescope, the dome, the weather station, the CCD camera, the calibration devices and the security devices. The computer receives orders from an operator who can be or not at the site of observation. The goal of this robotized observatory is the operation in a secure, autonomous and unattended way, with the purpose of to be used remotely by the students of the "Facultad de Ciencias Exactas, Físicas y Naturales" of the UNSJ. FULL TEXT IN SPANISH

Ethnic newspapers and low-income Spanish-speaking adults: influence of news consumption and health motivation on cancer prevention behaviors.

PubMed

King, Andy J; Jensen, Jakob D; Guntzviller, Lisa M; Perez Torres, Debora; Krakow, Melinda

2018-05-01

Ethnic newspapers have the potential to reach and influence various cultural and ethnic subpopulations traditionally underserved in the United States. The current study sought to explore how ethnic news consumption interacts with health motivation to predict cancer prevention behaviors in a sample of Spanish-speaking adults. Participants (N = 100) completed a survey in Spanish, with items measuring demographics, acculturation, health literacy, health motivation, ethnic newspaper consumption (for two papers: La Viva and La Raza), and cancer prevention behaviors. Results indicated consumption of ethnic newspapers correlated positively to acculturation, and cancer screening utilization. In hierarchical regression analyses, the interaction of consumption of an ethnic newspaper (La Raza) and health motivation predicted two of the six prevention behaviors assessed: avoidance of fatty foods and screening behavior. The study provides evidence that consumption of Spanish-language newspapers enhances the likelihood that individuals with high levels of health motivation will engage in healthy behaviors. This finding highlights the utility of utilizing Spanish-language newspapers to reach underserved populations.

Percepcion de los profesores universitarios acerca del concepto cultura cientifica y de sus implicaciones en el nuevo bachillerato del Recinto de Rio Piedras de la Universidad de Puerto Rico

NASA Astrophysics Data System (ADS)

Ramos Pastrana, Nilsa

El Senado Academico del Recinto de Rio Piedras de la Universidad de Puerto Rico aprobo en el ano academico 2005-2006 la Certificacion 46, que contiene los lineamientos de un nuevo bachillerato. Este nuevo bachillerato introdujo cambios significativos en el curriculo tradicional. Entre ellos se encuentra la reduccion del componente de educacion general y el de Ciencias Biologicas en particular. La reduccion de creditos en el componente de Ciencias Biologicas ha obligado a reevaluar el concepto de cultura cientifica que desarrollan esos cursos. El proposito del estudio consistio en auscultar las percepciones de los profesores de las Facultades de Administracion de Empresas, Humanidades, Ciencias Sociales, Ciencias Naturales, Educacion y Estudios Generales del Recinto de Rio Piedras de la Universidad de Puerto Rico en torno al concepto de cultura cientifica, los contenidos disciplinares del curso de Ciencias Biologicas y la reduccion de creditos en el nuevo bachillerato. Las preguntas que guiaron la investigacion fueron: ¿cuales son las percepciones que tienen los profesores de las Facultades de Administracion de Empresas, Ciencias Sociales, Estudios Generales, Ciencias Naturales, Humanidades y Educacion, en torno al concepto de cultura cientifica y los contenidos disciplinares del curso de Ciencias Biologicas? ¿cuales son las percepciones que tienen los profesores de Ciencias Biologicas en torno al concepto cultura cientifica y los contenidos disciplinares del curso de Ciencias Biologicas? ¿existen diferencias significativas por facultad, genero, experiencia, rango y nombramiento en las percepciones que tienen los profesores del Recinto de Rio Piedras de la Universidad de Puerto Rico sobre los elementos que caracterizan la cultura cientifica y los contenidos biologicos que deben tener los egresados del Recinto? ¿que implicaciones curriculares tienen estos testimonios en el desarrollo del concepto de cultura cientifica en el nuevo bachillerato? Para realizar la

English Language Learner Charter Schools

ERIC Educational Resources Information Center

Dessoff, Alan

2010-01-01

In districts with Hispanic populations, English language learning is a priority, particularly in the elementary grades, which many students enter still speaking Spanish as their primary language. In affiliation with the National Council of La Raza (NCLR), a private, non-profit organization focused on reducing poverty and discrimination and…

Birds of Antioquia: Georeferenced database of specimens from the Colección de Ciencias Naturales del Museo Universitario de la Universidad de Antioquia (MUA).

PubMed

Rozo, Andrea Morales; Valencia, Fernando; Acosta, Alexis; Parra, Juan Luis

2014-01-01

The department of Antioquia, Colombia, lies in the northwestern corner of South America and provides a biogeographical link among divergent faunas, including Caribbean, Andean, Pacific and Amazonian. Information about the distribution of biodiversity in this area is of relevance for academic, practical and social purposes. This data paper describes the dataset containing all bird specimens deposited in the Colección de Ciencias Naturales del Museo Universitario de la Universidad de Antioquia (MUA). We curated all the information associated with the bird specimens, including the georeferences and taxonomy, and published the database through the Global Biodiversity Information Facility network. During this process we checked the species identification and existing georeferences and completed the information when possible. The collection holds 663 bird specimens collected between 1940 and 2011. Even though most specimens are from Antioquia (70%), the collection includes material from several other departments and one specimen from the United States. The collection holds specimens from three endemic and endangered species (Coeligena orina, Diglossa gloriossisima, and Hypopirrhus pyrohipogaster), and includes localities poorly represented in other collections. The information contained in the collection has been used for biodiversity modeling, conservation planning and management, and we expect to further facilitate these activities by making it publicly available.

Making Education Work for Hispanic Americans: Some Promising Community-Based Practices.

ERIC Educational Resources Information Center

Orum, Lori S.

This paper describes the work of the National Council of La Raza to improve education for Hispanic students and their families. It provides an overview of the council's Innovative Education Project, an effort to demonstrate and evaluate effective models for use by affiliated community-based organizations to improve educational outcomes for…

Immigration Reform and Related Issues. Perspectivas Publicas. Issue Update.

ERIC Educational Resources Information Center

National Council of La Raza, Washington, DC.

Asserting that immigration reform and related issues have commanded sustained attention in the opening weeks of the 99th Congress, this paper provides an overview of important developments in this area, and highlights steps taken by the National Council of La Raza to help shape these developments. The developments discussed include: (1) The…

[Small bowel tumors: experience at the Instituto Nacional de Ciencias Médicas y Nutrición "Salvador Zubirán"].

PubMed

Sánchez-Ramón, A; Cerino-Palomino, V; Medina-Franco, H

2012-01-01

Malignant tumors of the small bowel are uncommon and include multiple histologic strains, which helps explain the existing limited understanding of them. The aim of this study was to evaluate surgically treated small bowel tumors and to determine the clinical and pathological characteristics that can have an impact on patient outcome. A retrospective, observational, and descriptive study was carried out. The case records of patients with small bowel tumor that were surgically treated at the Instituto Nacional de Ciencias Médicas y Nutrición "Salvador Zubirán" from 1990 to August 2011 were analyzed using the SPSS version 17.0 statistical package. Thirty-eight small bowel tumor patients were found that had been operated on within the time frame studied. Fifteen of them were women (39.50%) and 23 were men (60.50%), and the mean age was 55.6 years. The histologic distribution was 13 adenocarcinomas (34.20%), 10 neuroendocrine tumors (26.30%), 8 sarcomas (21.10%) and 4 lymphomas (10.50%). There was an increase in the incidence of sarcomas and adenocarcinomas, whereas lymphomas and neuroendocrine tumors were evenly distributed. An increase in small bowel tumor incidence in the last few years was observed and adenocarcinoma was the most frequent tumor in the study population. It is important to have a high degree of suspicion for this disease when patients present with symptoms such as gastrointestinal bleeding, bowel obstruction, anemia, and weight loss, because early diagnosis is essential for guaranteeing favorable outcome. Copyright © 2012 Asociación Mexicana de Gastroenterología. Published by Masson Doyma México S.A. All rights reserved.

La implantacion del enfoque constructivista en el aula de ciencia: Estudio de caso multiple

NASA Astrophysics Data System (ADS)

Arroyo Betancourt, Luz I.

Esta investigacion estudia la implantacion del enfoque constructivista en tres aulas de ciencia del contexto puertorriqueno. Se auscultaron las practicas educativas que utilizan maestras consideradas constructivistas y la correspondencia de sus practicas educativas con los elementos esenciales de la didactica que proponen los teoricos de los planteamientos constructivistas. Se ausculto, ademas, a que vision del enfoque constructivista responden las expresiones de las maestras acerca de su practica educativa y como compara con su quehacer, a la luz de los elementos esenciales de las visiones constructivistas piagetiana, social y radical. Se utilizo el diseno de estudio descriptivo de caso multiple. El estudio se baso en entrevistas a profundidad, revision de documentos y observacion no participativa a la sala de clases. El contexto fueron tres escuelas publicas de la Region Educativa de San Juan, una elemental, una intermedia y una superior. Los resultados confirmaron que la transicion hacia el enfoque constructivista es un proceso que toma tiempo, dedicacion y la participacion en adiestramientos y readiestramientos acerca del nuevo enfoque. Las maestras coinciden en la mayoria de las practicas educativas que utilizan para implantar el enfoque constructivista de ensenanza y difieren en algunas debido, probablemente, a que han tenido que adaptarlas a los correspondientes niveles de ensenanza: elemental, intermedio y superior. Dos de las maestras planifican por conceptos generadores, mientras que una de ellas planifica siguiendo la guia que recibe del Departamento de Educacion. Difieren ademas, en el enfasis que confieren al inquirir cientifico. Con relacion a la correspondencia entre la vision manifestada por las maestras a la luz de las visiones piagetiana, social y radical, aparentemente, las preguntas del protocolo de entrevistas no lograron evocar la informacion con suficiente profundidad, por lo que la investigadora tuvo que inferir las visiones de las

For My Children: Mexican American Women, Work, and Welfare. Focus Study Report #2.

ERIC Educational Resources Information Center

Quiroz, Julia Teresa; Tosca, Regina

This is the final report of the National Council of La Raza's (NCLR) Focus Study examining the opinions, attitudes, and needs of Mexican American single women, relating to implementation of national welfare reform legislation. Over a 2-year period NCLR staff held focus groups with Mexican American women in four communities: Phoenix, Arizona; Mora,…

Rimas Tontas. (Nonsense Rhymes)

ERIC Educational Resources Information Center

Galarza, Ernesto

Part of the series "Coleccion Mini-Libros" (Mini-Book Collection), the booklet is a compilation of 50 short nonsense verses written in Spanish. The author and The Southwest Council of La Raza offer the collection for the use of parents and teachers dedicated to stimulating interest in Spanish among the youth of our country. (EJ)

Investing in Boys and Young Men of Color: The Promise and the Opportunity. Issue Brief: Focus on Education

ERIC Educational Resources Information Center

Bird, Kisha; Bryant, Rhonda

2014-01-01

This policy brief was prepared for the "Investing in Boys and Young Men of Color: The Promise and Opportunity" briefing held in June 2014 that was co-sponsored by National Council of La Raza, PolicyLink, the Executive Alliance to Expand Opportunities for Boys and Young Men of Color, and the Institute for Black Male Achievement. The…

Plugged in: Positive Development Strategies for Disconnected Latino Youth. A Report of the NCLR Escalera Program

ERIC Educational Resources Information Center

Hageage, Ana

2011-01-01

This report profiles the National Council of La Raza (NCLR) Escalera Program: Taking Steps to Success, a Latino-serving, community-based youth workforce development program, which was developed in 2001 in partnership with the PepsiCo Foundation and PepsiCo, Inc. and expanded in 2008 with the support of Shell Oil Company. The Escalera Program:…

The ATPG Attack for Reverse Engineering of Combinational Hybrid Custom-Programmable Circuits

DTIC Science & Technology

2017-03-23

The ATPG Attack for Reverse Engineering of Combinational Hybrid Custom- Programmable Circuits Raza Shafiq Hamid Mahmoodi Houman Homayoun Hassan... programmable circuits. While functionality of programmable cells are only known to trusted parties, effective techniques for activation and propagation...of the cells are introduced. The ATPG attack carefully studies dependency of programmable cells to develop their (partial) truth tables. Results

Organizing MySpace: Youth Walkouts, Pleasure, Politics, and New Media

ERIC Educational Resources Information Center

Yang, K. Wayne

2007-01-01

While the major urban centers around the country were flooded by millions of protesters demanding immigrant rights in March 2006, the San Francisco Bay Area remained relatively quiet. A coalition of organizers, including Centro Legal de la Raza, Deporten A La Migra, and the Bay Area Immigrant Rights Coalition mobilized a one-week hunger strike,…

77 FR 35317 - Gruma Corporation, Spina Bifida Association, March of Dimes Foundation, American Academy of...

Federal Register 2010, 2011, 2012, 2013, 2014

2012-06-13

... Academy of Pediatrics, Royal DSM N.V., and National Council of La Raza; Filing of Food Additive Petition... petition proposing that the food additive regulations be amended to provide for the safe use of folic acid...(b)(5) (21 U.S.C. 348(b)(5))), notice is given that a food additive petition (FAP 2A4796) has been...

El Midwest Canto Al Pueblo: "otra vez, c/s"

ERIC Educational Resources Information Center

Guernica, Antonio Jose; Saavedra, Pilar

1977-01-01

El Midwest Canto Al Pueblo was a successful effort to bring artists, poets, musicians, and cultural workers together in a setting conducive to a free and easy interchange of ideas and directions in order to reaffirm, share, and celebrate the identity of La Raza with el pueblo. The activities during the 10-day festival included poetry readings,…

The Effect of Simulated Welding Conditions on Austenite Decomposition Kinetics.

DTIC Science & Technology

1981-07-01

Departamento de Metalurgia, . Facultad de Ciencias Quimicas , Universidad Complutense, Madrid, Spain 1981 .. 2 1982 A Approved for Public Release...Development London England London England CONTRACT NUMBER DAJA 37-80-C-0298 Departamento de Metalurgia, Facultad de Ciencias Quimicas , Universidad...Complu -nse, Madrid, Spain 19h1 Approved for Public Release, Distribution unlimited E~flA: Departameflto de Metalurgia. Facultad de Ciencias Quimicas

Brown Country: Johnny Rodriguez

ERIC Educational Resources Information Center

Vargas, Deborah R.

2007-01-01

The year 1972 was part of a dynamic period of Chicano politics and cultural production in South Texas. A few years earlier, in the Crystal City Revolts, Tejanos had moved to gain control of city and school board positions, events that resulted in the creation of the Raza Unida Party in 1970. Nineteen seventy-two also marked the beginning of the…

Breast Cancer Epidemiology in Puerto Rico

DTIC Science & Technology

2013-06-30

Universidad de Puerto Rico Recinto de Ciencias Medicas Escuela Graduada de Salud Publica Apartado postal 365067, San Juan, Puerto Rico 00936-5067... Ciencias Medicas. Este proyecto recibe fondos del Programa de Investigacion de Cancer de Mama, bajo el mecanismo de Donativo para Adiestramiento en...minimo. Una enfermera adiestrada del Consorcio de Investigacion Clinica y Traslacional del Recinto de Ciencias Medicas (PRCTRC) tomara estas muestras

Development of Ultra-High Mechanical Damping Structures Based on the Nano-Scale Properties of Shape Memory Alloys

DTIC Science & Technology

2013-07-29

Condensada Facultad de Ciencia y Tecnologia Aptdo 644 Bilbao, Spain 48080 EOARD Grant 10-3074 Report Date: July 2013 Final Report... Ciencia y Tecnologia Aptdo 644 Bilbao, Spain 48080 8. PERFORMING ORGANIZATION REPORT NUMBER N/A 9. SPONSORING/MONITORING AGENCY... Ciencia y Tecnologia, Aptdo 644, 48080 Bilbao, Spain. E-mail: jose.sanjuan@ehu.es Summary In recent years it was discovered that micro and nano

U.S. Government Funding of Cooperative Research and Development in North America,

DTIC Science & Technology

1999-01-01

Consejo Nacional de Ciencia y Tecnologia (CONACYT) reports that it has signed agreements with U.S. government agencies, such as NSF, NIH, and NIST, to...government agency Consejo Nacional de Ciencia y Tec- nologia for providing feedback and validation of much of the information collected in this report...David Mussington and Beth Lachman. ABBREVIATIONS CDC Centers for Disease Control and Prevention CONACYT Consejo Nacional de Ciencia y Tecnologfa

Food Additives Permitted for Direct Addition to Food for Human Consumption; Folic Acid. Final rule.

PubMed

2016-04-15

The Food and Drug Administration (FDA or we) is amending the food additive regulations to provide for the safe use of folic acid in corn masa flour. We are taking this action in response to a food additive petition filed jointly by Gruma Corporation, Spina Bifida Association, March of Dimes Foundation, American Academy of Pediatrics, Royal DSM N.V., and National Council of La Raza.

La Familia de la Raza. (The Family of the Race.)

ERIC Educational Resources Information Center

Armas, Jose

Chicanos in this country have been in a constant state of struggle for economic and cultural survival; yet the Chicano's family has remained the most important part of his culture. Chicano values, customs, life styles, and language are still very much a part of his family. This publication discusses the Chicano's family, covering: (1) la familia…

Workshop on New Trends in Topological Insulators Held in Barcelona, Spain on 3-6 June 2013. Abstracts Book

DTIC Science & Technology

2013-06-01

Center (DIPC), 20018 San Sebastián/Donostia, Basque Country, Spain b Departamento de Física de Materiales, Facultad de Ciencias Químicas, UPV/EHU, Apdo...a,*, Pablo San José a , Elsa Prada b Jorge Cayao a a Instituto de Ciencia de Materiales de Madrid (ICMM), Consejo Superior de Investigaciones...Topological Insulator. Luis Brey Instituto de Ciencia de Materiales de Madrid. CSIC brey@icmm.csic.es Abstract A topological insulator

Reconversion Militar del Ejercito en la Frontera Dominico-Haitiana (Military Restructuring of the Army on the Dominican-Haitian Border)

DTIC Science & Technology

2013-05-22

Estado Mayor del Ejército de EE. UU. en cumplimiento parcial de los requisitos para la obtención del grado de MAESTRÍA EN CIENCIAS Y ARTES...MILITARES Estudios Generales Por MAYOR FELIPE CÉSPEDES TEJERA, EJÉRCITO NACIONAL DOMINICANO Licenciado en Ciencias Sociales, Universidad...ANSI Std. Z39.18 ii MAESTRÍA EN ARTES Y CIENCIAS MILITARES PÁGINA DE APROBACIÓN DE LA TESIS Nombre del Candidato: Mayor Felipe Céspedes Tejera

Launching Latin America: International and Domestic Factors in National Space Programs

DTIC Science & Technology

2014-12-01

Rocket],” Globo.com, August 22, 2013, http://g1.globo.com/ ciencia -e-saude/noticia/2013/08/tragedia-em-alcantara-faz-dez-anos- e-brasil-ainda-sonha...October 2005, http://super.abril.com.br/ ciencia /sabotagem-tio-sam- 446333.shtml. 127 D’Alama, “Tragédia Em Alcântara.” 128 Associated Press...http://idbdocs.iadb.org/wsdocs/getdocument.aspx?docnum=33036507. 64 including the new Ministerio del Poder Popular para Ciencia , Tecnología e

The Armed Forces and the Fight against Drug-Trafficking in Honduras (Las FUERZAS ARMADAS EN EL COMBATE AL NARCOTR FICO EN HONDURAS)

DTIC Science & Technology

2013-06-13

Estado Mayor del Ejército de EE. UU. En cumplimiento parcial de los requisitos para la obtención del grado de MAESTRÍA EN CIENCIAS Y ARTES MILITARES...Estudios Generales Por WALTER D. HERNANDEZ CARVAJAL, MAYOR DEL EJÉRCITO DE HONDURAS Licenciado en Ciencias Militares...Form 298 (Rev. 8-98) Prescribed by ANSI Std. Z39.18 ii MAESTRÍA EN ARTES Y CIENCIAS MILITARES PÁGINA DE APROBACIÓN DE LA TESIS Nombre del

AMSAHTS 󈨞: Advances in Materials Science and Applications of High Temperature Superconductors Held in Goddard Space Flight Center, Greenbelt, MD on April 2-6, 1990

DTIC Science & Technology

1991-01-01

Millhn, I. Rasines* Instituto de Ciencia de Materiales , CSIC Serrano 113, 28006 Madrid, Spain. J.A. Camps, Facultad de Ciencias Geol6gicas, UCM Ciudad...L2080-L2081, 1987. 28. J. Amador, M.T. Casais, C. Cascales, A. Castro and I. Rasines, "Sintesis y ca- racterizaci6n de nuevos 6xidos superconductores...Ciencia de Materiales (Spain) REICK, Franklin Fluoramics, Inc. REILEY, Don PTO/Mech/Gen Classification Gp ROMANOFSKY, Robert NASA Headquarters ROYTBURD, A

Melanocortin and Opioid Peptide Interactions in the Modulation of Binge Alcohol Drinking

DTIC Science & Technology

2013-04-01

Spain (June, 2010). Talk titled A Role for Central Neuropeptides in Binge Alcohol Drinking. 4. Departamento de Neurociencia y Ciencias de la Salud...Hill, Chapel Hill, North Carolina; Department of Neurociencia y Ciencias de la Salud (JML-C, FC, IC), University of Almerı́a, Almerı́a, Spain. Received...Low, 2008). From the Department of Neurociencia y Ciencias de la Salud (IC, FC, JML-C), University of Almerı́a, Almerı́a, Spain; and Department of

Ungoverned Spaces in Mexico: Autodefensas, Failed States, and the War on Drugs in Michoacan

DTIC Science & Technology

2014-12-01

to the negotiated transition: The case of Mexico in comparative perspective],” Revista Mexicana de Ciencias Politicas y Sociales 40, no. 162 (December...2012 [Mexican ports in the XXI century: Situation and debate 1991–2012],” Ciencia y Mar 15, no. 45 (2011): 25, 19–62 99 According to Wikipedia, a...2012 [Mexican ports in the XXI century: Situation and debate 1991– 2012].” Ciencia y Mar 15, no. 45 (2011): 19–62. Oyarvide, Cesar Morales. “La Guerra

The Lost Path: Regulating Transit Illegal Immigration on Mexico’s Southern Border

DTIC Science & Technology

2014-12-01

Latinoamericana de Ciencias Sociales, August 2013), 160. 7 George W. Grayson, “Mexico’s Forgotten Southern Border: Does Mexico Practice at Home What...Migraciones en el Sur de México y Centroamérica (Universidad de Ciencias y Artes de Chiapas, 2008), 239. 243 Cervera, “ La Otra Frontera,” 144. 244...Tensiones entre los Derechos Humanos, Ley y Justicia,” in Migraciones en el Sur de México y Centroamérica (Universidad de Ciencias y Artes de Chiapas

Ciencia en Espanol.

ERIC Educational Resources Information Center

Schon, Isabel

1992-01-01

A guide for teachers and librarians covering over 50 Spanish-language books that introduce children to various animals; the world around them; colors, shapes, and numbers; the universe; basic science concepts; and the process of conception, pregnancy, and birth. (MDH)

76 FR 51266 - National Oil and Hazardous Substances Pollution Contingency Plan; National Priorities List...

Federal Register 2010, 2011, 2012, 2013, 2014

2011-08-18

... which was selected in the ROD. The SDs hired M&S Ingenieria y Ciencia Asociados who prepared remedial... approved the Remedial Action Work Plan and M&S Ingenieria y Ciencia Asociados as the Settling Defendants...

El Mejoramiento de la Efectividad del Personal de las Diferentes Unidades del Ejrcito de Guatemala Involucradas en la Integracin de Contingentes Desplegados en Diferentes Misiones de Paz de la Organizacin de las Naciones Unidas (Improving the Effectiveness of Guatemalan Army Units that Provide Soldiers to Units Deployed in United Nations Peace Missions)

DTIC Science & Technology

2017-06-09

del Ejército de EE.UU. Colegio de Comando y Estado Mayor en el cumplimiento parcial de los requisitos para el grado de MAESTRÍA EN CIENCIAS Y...Rev. 8-98) Prescribed by ANSI Std. Z39.18 iii MAESTRÍA EN CIENCIAS Y ARTES MILITARES PAGINA DE APROBACIÓN DE LA TESIS Name of Candidate: Major... Ciencias Militares. A mi honorable comité de tesis, Doctor Edwin Roldán, Coronel Francisco Rivera Pérez del Ejército de Guatemala y al Mayor Rafael

The H-Function and Probability Density Functions of Certain Algebraic Combinations of Independent Random Variables with H-Function Probability Distribution

DTIC Science & Technology

1981-05-01

functions and the H- function," Boletin do la Academia de Ciencias Fisicas Matematicas v Naturales (Caracas), 31, 95- 102 (1971). 120. Jain, U. C...Society, 37, 329- 334 (1973). 32. Oliver, M. L., and S. L. Kalla, "On the derivative of Fox’s H- function," (Spanish) Acta 14,dlcana de Ciencia -v...34 Universidade de Lisboa Revista de Faculdade de Ciencias FMatematicas, II, Series A, 13, 109-114 (1969-70). 92. Bajpai, S. D., "On some results involving Fox’s H

Deconvoluting the Complexity of Bone Metastatic Prostate Cancer via Computational Modeling

DTIC Science & Technology

2016-09-01

Fellowship (2015-2017) Consejo Nacional de Ciencia y Tecnologia (CONACYT) MRes/PhD scholarship (2007- 2011) CERN Teacher Programme scholarship (2007...UDLAP Apoyo a Ciencias BSc scholarship (2000-2005) Awards Society for Mathematical Biology (SMB) Travel Award (2015

The Tumor Suppressor Actions of the Vitamin D Receptor in Skin

DTIC Science & Technology

2013-08-01

S. Yu, et al., Basal cell carcinomas inmiceoverexpressing Gli2 in skin, Nature Genetics 24 (3) (2000) 216–217. 61] M. Nilsson, A.B. Unden, D. Krause ...Meineke V, Gartner BC, Wolfgang T, Holick MF, Reichrath J. Analysis of the vitamin D system in cutaneous malignancies. Recent Results Cancer Res...10700170] 63. Nilsson M, Unden AB, Krause D, Malmqwist U, Raza K, Zaphiropoulos PG, Toftgard R. Induction of basal cell carcinomas and trichoepitheliomas

Flooding in Pakistan: Overview and Issues for Congress

DTIC Science & Technology

2010-09-21

sites are women. Many of the men have endured the flooding and gone back to their property to salvage belongings and deter squatters. There have...seated in the spring of 2008 after relatively free and fair elections. It is led by the Pakistan People’s Party (PPP) of President Asif Zardari and...Prime Minister Yousaf Raza Gilani. After flooding began in late July, President Zardari came under intense criticism for going ahead with a planned

Development of Ultra-high Mechanical Damping Structures Based on Nano-scale Properties of Shape Memory Alloys

DTIC Science & Technology

2011-07-27

Alloys Jose San Juan Universidad del Pais Vasco Department of Physics of Condensed Matter Facultd de Ciencia y Tecnologia Bilbao...Facultd de Ciencia y Tecnologia Bilbao, Spain 48080 8. PERFORMING ORGANIZATION REPORT NUMBER N/A 9. SPONSORING/MONITORING AGENCY NAME(S

EL DESARROLLO DE CAPACIDADES Y SU INFLUENCIA EN EL DESARROLLO DE LAS OPERACIONES DE DESMINADO HUMANITARIO EN LA CORDILLERA DEL CNDOR (Development of Capabilities for the Conduct of Humanitarian Demining Operations in the Condor Mountain Range)

DTIC Science & Technology

2017-06-01

para el grado de MAESTRÍA EN EL ARTE Y CIENCIA MILITAR Estudios Generales por PERCY ALEXIS RODRÍGUEZ CASTILLO, LTC, EJÉRCITO DE...PERÚ Licenciado en Ciencias Militares, Escuela Militar de Chorrillos “CRL Francisco Bolognesi”, Lima, Perú, 1999 WHINSEC 2017

New Physical Constraints for Multi-Frame Blind Deconvolution

DTIC Science & Technology

2014-12-10

Laboratory) Dr. Julian Christou (Large Binocular Telescope Observatory) REAL ACADEMIA DE CIENCIAS Y ARTES DE BARCELONA RAMBLA DE LOS ESTUDIOS 115... CIENCIAS Y ARTES DE BARCELONA RAMBLA DE LOS ESTUDIOS 115 BARCELONA, 08002 SPAIN 8. PERFORMING ORGANIZATION REPORT NUMBER 9. SPONSORING/MONITORING

Federal Law Enforcement in Bi-National Perspective: The United States FBI and the Mexican PFM

DTIC Science & Technology

2014-09-01

de Ciencias Penales INCLE International Narcotics Control and Law Enforcement IT information technology LISSSTE Ley del Instituto de Seguridad y...Instituto Nacional de Ciencias Penales—INACIPE).195 However, if the video on Youtube.com is an indication of the seriousness with which ministerial

Models, Analysis, and Recommendations Pertaining to the Retention of Naval Special Warfare s Mid-Level Officers

DTIC Science & Technology

2013-12-01

The Analytic Hierarch/Network Process,” in Rev. R. Acad. Cien. Serie A. Mat (RACSAM), submitted by Francisco Javier Giron (Real Academia de Ciencias ...Academia de Ciencias : Spain. Scott, Nathan. Naval Special Warfare Officer Retention Survey. Monterey, CA: NPS Press, September 2013. Whittenberger

Implementation of a General Reform Plan in the Army of the Dominican Republic (IMPLEMENTACI N DE UNA REFORMA INTEGRAL EN EL EJ RCITO DE LA REPUBLICA DOMINICANA)

DTIC Science & Technology

2013-06-13

CIENCIAS Y ARTES MILITARES Estudios Generales Por TTE.COR. MANUEL A. CARRASCO GUERRERO B.A., Technical University of Santiago-Utesa......otras sinceramente muchas gracias. v TABLA DE CONTENIDO Páginas MAESTRÍA EN CIENCIAS Y ARTES MILITARES PAGINA DE APROBACION DE LA TESIS

The United States, Latin America, and the Potential for a Naval and Defense Industrial Partnership: The Case of Brazil

DTIC Science & Technology

1993-03-01

at the XV Encontro da Associacao Nacional de Posgraduacao e Pesquisa em Ciencias Sociais (ANPOCS); Grupo de Trabalho Forcas Armadas, Estado e...XV Encontro da Associacao Nacional de Posgraduacao e Pesquisa em Ciencias Sociais (ANPOCS); Grupo de Trabalho Forcas Armadas, Estado e Sociedade

The Effect of Formulary Restrictions on Patient and Payer Outcomes: A Systematic Literature Review.

PubMed

Park, Yujin; Raza, Syed; George, Aneesh; Agrawal, Rumjhum; Ko, John

2017-08-01

positive in direction or were favorable, when the perspectives of patients and payers were considered. Of the total number of drug utilization outcomes reported (n = 46), the majority showed lower drug utilization (> 90%). However, in some of the articles, pharmacy cost savings resulting from lower drug utilization appeared to be offset by increased medical costs. Formulary coverage decisions may have unintended consequences on patient and payer outcomes despite lower drug utilization and pharmacy cost savings; therefore, careful evaluation of restrictions before policy implementation and continued reevaluation after implementation is warranted. This study was funded by Novartis Pharmaceuticals. Park and Ko are employed by Novartis Pharmaceuticals in East Hanover, New Jersey, and Ko holds stock in Novartis. Raza, George, and Agrawal are employed by Novartis Healthcare in Hyderabad, India. Study concept and design were contributed primarily by Park and Ko, along with the other authors. Raza, George, and Agrawal collected the data, along with Park and Ko. Data interpretation was performed by Agrawal, Raza, George, Park, and Ko. The manuscript was written and revised by Raza, George, and Park, along with Ko and Agrawal. Results from this systematic literature review were presented at the AMCP Annual Meeting 2016; San Francisco, California; April 19-22, 2016.

Tempest, Arizona: Criminal Epistemologies and the Rhetorical Possibilities of Raza Studies

ERIC Educational Resources Information Center

Serna, Elias

2013-01-01

This essay looks at Ethnic Studies activism in Arizona through a rhetorical lens in order to highlight epistemological aspects of activities such as a high school Chicano Literature class, Roberto "Dr. Cintli" Rodriguez's journalism, and student activism to defend the Mexican-American Studies Department. Taking rhetoric's premise that…

Inflammatory fibroid polyp of the gastrointestinal tract: 10 years of experience at the Instituto Nacional de Ciencias Médicas y Nutrición Salvador Zubirán.

PubMed

Romano-Munive, A F; Barreto-Zuñiga, R; Rumoroso-García, J A; Ramos-Martínez, P

2016-01-01

Inflammatory fibroid polyp (lFP) is a rare, benign, and solitary neoplasm predominantly located in the gastric antrum and small bowel. Its clinical symptoms are heterogeneous and essentially depend on the location and size of the tumor. Definitive diagnosis is made through histopathology and this pathology has excellent long-term prognosis. To identify the cases of IFP seen at the Instituto Nacional de Ciencias Médicas y Nutrición Salvador Zubirán over a 10-year period. A retrospective, cross-sectional, descriptive, and observational study was conducted that included patients with histopathologic diagnosis of IFP within the time frame of January 2001 and December 2011. Six cases were found and 5/6 (83.3%) of them were women. The median age was 41 years (minimum-maximum range of 19-56 years). The most frequent symptoms were weight loss (n=3), fever (n=2), nausea (n=2), and vomiting (n=2). Three patients presented with iron deficiency anemia and 2 cases with intussusception. The IFPs were located at the following sites: esophagus (n=1), stomach (n=2), small bowel (n=2), and colon (n=1). Treatment was surgical in 5/6 (83.3%) of the patients. IFPs are extremely rare in our population. They usually present with weight loss and iron deficiency anemia and are more frequently located in the stomach and small bowel. This is the largest reported IFP case series in a Mexican population. Copyright © 2016 Asociación Mexicana de Gastroenterología. Publicado por Masson Doyma México S.A. All rights reserved.

War of the Masses: a Component of Guerrilla Warfare.

DTIC Science & Technology

2016-05-10

Bogotá: Universidad Nacional de Colombia, Facultad de Derecho, Ciencias Politicas y Sociales, 2009), 72. 59 Carlos Medina Gallego, “FARC-EP: El Partido...de Derecho, Ciencias Politicas y Sociales, 2009. 53 Mendoza, Plinio Apuleyo. “La Segunda Independencia.” El Tiempo. September 13, 2013. Accessed

China’s Relations with Portuguese-speaking Countries: A Growing but Unnoticed Relation

DTIC Science & Technology

2012-09-01

Brazil and China Expand Satellite Program and African Countries Receive data from CBERS) Ministerio da Ciencia e Tecnologia do Brasil (Brazilian Ministry...Washington D.C. Ministerio da Ciencia e Tecnologia do Brasil (Brazilian Ministry of Science and Technology). “Brasil e China Ampliao Base do Programa CBERS

Physical Measurements of Water Properties Across the Mouth of the Gulf of California during April 2013 (PESCAR24 Cruise) (Mediciones Fisicas de las Propiedades del Agua a Traves de la Boca del Golfo de California Durante Abril de 2013 (Crucero PESCAR24)

DTIC Science & Technology

2013-11-26

Ciencias Marinas en Kiel, Alemania. El intervalo de profundidad entre súper-ensambles conjuntos se estableció en 8 m. Los perfiles de CTD...variation of the temperature and salinity at the entrance to the Gulf of California, Mexico. Ciencias Marinas 26(4): 561-583. Castro, R., R

Quantum Confined Semiconductors - In-House Interim Research

DTIC Science & Technology

2013-04-01

Laboratory, Materials & Manufacturing Directorate, Wright Patterson AFB, OH 45433-7707, USA blnstituto de Ciencias Fisicas, Universidad Nacional Aut6noma...111is work was supported by the Ai1· Force Office of Scientific Research (AFRU RS E, Dr. Kitt Reinhardt). • Also with lnstituto de Ciencias Fisicas

Predicting Failure Initiation in Structural Adhesive Joints

DTIC Science & Technology

2012-08-15

Elastoplástico de Adhesivos – Modeling, characterization and simulation of the elastoplastic behavior of adhesives. Maestría en Ciencia de Materiales...adhesive and a 1018 steel”. Maestría en Ciencia de Materiales. Centro de Investigación en Materiales Avanzados S.C. May 2012.  Abstract: In the

Targeting Androgen Receptor in Breast Cancer: Enzalutamide as a Novel Breast Cancer Therapeutic

DTIC Science & Technology

2014-09-01

of Medivation. JG, FG, IEA, and EMcC are employed by Fundacion Ciencia & Vida in Santiago, Chile and receive partial funding from Medivation. The...CA 94105, USA. 3Fundación Ciencia & Vida, Avda. Zañartu 1482 - Ñuñoa, Santiago 7780272, Chile. 4Department of Medicine, Division of Oncology

Mathematical Models for Camouflage Pattern Assessment

DTIC Science & Technology

2013-04-01

Matemático Facultad de Ciencias F́ısicas y Matemáticas http://www.cmm.uchile.cl DISTRIBUTION A: Distribution approved for public release University of Chile...Centro de Modelamiento Matemático Facultad de Ciencias Físicas y Matemáticas Final Report: Camouage Assessment January 2013 Abstract The main

Terrorism Outsourced: The FARC’s Criminal Alliances

DTIC Science & Technology

2014-12-01

of victims],” Revista Española De Ciencia Política 10 (2004): 53‒79. 108 This is the same terrorist that planned and executed the attack on El Nogal...victims].” Revista Española De Ciencia Política 10, (2004): 53‒79. De Nooy, Wouter, Andrej Mrvar, and Vladimir Batagelj. Exploratory Social

No Anticorrelation between Cyclotron Line Energy and X-ray Flux in 4U 0115+634

DTIC Science & Technology

2013-01-01

University of California, San Diego, La Jolla, CA 92093, USA 10 Instituto Universitario de Física Aplicada a las Ciencias y las Tecnologías, University of...Space Agency CNES through CNRS. S.M.N. and J.M.T. acknowledge support from the Spanish Ministerio de Ciencia , Tecnología e Innovación (MCINN) through

Estimation of Posterior Probabilities Using Multivariate Smoothing Splines and Generalized Cross-Validation.

DTIC Science & Technology

1983-09-01

Ciencia y Tecnologia -Mexico, by ONR under Contract No. N00014-77-C-0675, and by ARO under Contract No. DAAG29-80-K-0042. LUJ THE VIE~W, rTIJ. ’~v ’’~c...Department of Statis- tics. For financial support I thank the Consejo Nacional de Ciencia y Tecnologia - Mexico, and the Department of Statistics of the

Contributions to Industrial Development of Science and Technology Institutions in Colombia and Opportunities for Bilateral Cooperation.

DTIC Science & Technology

1979-12-01

Source: Ciencia , Tecnologia , y Desarrollo, Bogota, 2 (1>: 142, February- March, 1978 Many suggestions have been offered as to steps that could be taken...quite sharp. Studies prepared for COLCIENCIAS and FES, for example, have iden- tified the following problem areas ( Ciencia , Technologia, y Desarrollo...representing the official opinion or policy of the United States Government. F:, PREFACE This report analyzes (.& Y the characteristics and capabilities of the

New Inhibitors of the Peripheral Site in Acetylcholinesterase that Specifically Block Organophosphorylation

DTIC Science & Technology

2000-09-01

Interministerial de Ciencia y (donepezil, Arice Teenologia ( Programa Nacional de Tecnologia de los Procesos Qufmios, pt) in 1996. A third potent reversible...Molecular, Facultad de Ciencias Biol6gicas, Pontificia Universidad Cat6lica de Chile , Alameda 340, 114-D Santiago, Chile Running Title: Thioflavin T...2000 Medical Defense Review, Hunt Valley, Maryland, June 4-9, 2000. In press. De Ferrari, G.V., Mallender, W.D., Inestrosa, N.C., and Rosenberry, T.L

Achieving Conservation Science that Bridges the Knowledge–Action Boundary

PubMed Central

Cook, Carly N; Mascia, Michael B; Schwartz, Mark W; Possingham, Hugh P; Fuller, Richard A

2013-01-01

both advances scientific understanding and contributes to decision making. Logrando que la Ciencia de la Conservación Trasponga la Frontera Conocimiento-Acción Resumen Hay muchas barreras para utilizar ciencia para informar a la política y práctica de la conservación. Los científicos de la conservación que desean producir ciencia relevante para el manejo deben equilibrar esta meta con el imperativo de demostrar novedad y rigor en su ciencia. Los tomadores de decisiones que buscan que sus decisiones se basen en evidencias deben equilibrar el deseo de conocimientos con la necesidad de actuar a pesar de la incertidumbre. La generación de ciencia que informe efectivamente a las decisiones de manejo requiere que la producción de información (los componentes del conocimiento) sea sobresaliente (relevante y oportuna), creíble (autoritativa, verosímil y confiable) y legítima (desarrollada mediante un proceso que considera los valores y perspectivas de todos los actores relevantes) a la vista tanto de investigadores como de tomadores de decisiones. Percibimos tres retos clave para quienes desean generar ciencia de la conservación que logre estas tres características de la información. Primero, las audiencias científicas y de manejo pueden tener percepciones contrastantes sobre la relevancia de la investigación. Segundo, la credibilidad se puede lograr a costa de la relevancia y legitimidad a la vista de los tomadores de decisiones y tercero, los diferentes actores pueden tener percepciones conflictivas sobre los que constituye información legítima. Resaltamos cuatro marcos institucionales que pueden facilitar que la ciencia informe al manejo: organizaciones de frontera (organizaciones ambientales que trasponen la frontera entre la ciencia y el manejo), investigadores científicos insertados en agencias de manejo de recursos, vínculos formales entre tomadores de decisiones y científicos en instituciones enfocadas a la investigación, y programas de

Libros de Ciencias en Espanol

ERIC Educational Resources Information Center

Schon, Isabel

2004-01-01

Spanish-speaking children, like children everywhere, are naturally interested in the world around them. If teachers are to encourage their understanding and appreciation of the natural and physical sciences, they should provide them with a wide variety of books they can read and understand. From board books about farm animals to a high-interest…

Libros de Ciencias en Espanol.

ERIC Educational Resources Information Center

Schon, Isabel

1997-01-01

Presents an annotated list of recently published science trade books in Spanish that can engage students in a variety of science concepts. Books are listed in the categories of biology, ecology, general science, and technology. (JRH)

Functional Genomics of a Non-Toxic Alexandrium Lusitanicum Culture

DTIC Science & Technology

2007-02-01

OCE-0402707. This work was also supported by a graduate fellowship from the Fundacao para a Ciencia e Tecnologia , Portugal. Reproduction in whole or...that lead to this point. This work was supported by a graduate fellowship from the Fundaqa-o para a Ciencia e Tecnologia , Portugal. 3 4 TABLE OF...from the Fundaqo para a Ci~ncia e cultures (data not shown). It is therefore possible that the Tecnologia (FCT), Portugal. Funding provided in part

Symposium DD: Low-Dimensional Materials-Synthesis, Assembly, Property Scaling and Modeling. Held in San Francisco, CA on April 9-13, 2007

DTIC Science & Technology

2008-06-01

Ciencia e Ingenieria de los Materiales , Universidad de Costa Rica, San Jose, Costa Rica. We have developed a new unifying tight-binding theory that...Fisico Matem6ticas, Universidad Aut6noma de Nuevo Le6n, San Nicolas de los Garza, Nuevo LeAfA3n, Mexico; 2Chemical Engineering Department and Texas...ORNL), Oak Ridge, Tennessee; 2Departamento de Ciencia de los Materiales e IM y QI, Universidad de Cadiz, Puerto Real, Cadiz, Spain; 3Departamento de

Associations Between Ethnic Labels and Substance Use Among Hispanic/Latino Adolescents in Los Angeles

PubMed Central

Unger, Jennifer B; Thing, James; Soto, Daniel Wood; Baezconde-Garbanati, Lourdes

2014-01-01

Self-identification with ethnic-specific labels may indicate successful ethnic identity formation, which could protect against substance use. Alternatively, it might indicate affiliation with oppositional subcultures, a potential risk factor. This study examined longitudinal associations between ethnic labels and substance use among 1,575 Hispanic adolescents in Los Angeles. Adolescents who identified as Cholo or La Raza in 9th grade were at increased risk of past-month substance use in 11th grade. Associations were similar across gender and were not confounded by socioeconomic status, ethnic identity development, acculturation, or language use. Targeted prevention interventions for adolescents who identify with these subcultures may be warranted. PMID:24779500

Production and quality assurance in the SIT Africa Mediterranean fruit fly (Diptera: Tephritidae) rearing facility in South Africa

DOE Office of Scientific and Technical Information (OSTI.GOV)

Barnes, B.; Rosenberg, S.; Arnolds, L.

machos esteriles de moscas para el proyecto de la tecnica del insecto esteril (TIE) en huertos de frutos y vinas comerciales en la provincia del Cabo Occidental del Sudafrica. El procedimiento de criar en masa fue en su mayor parte basado en los sistemas desarrollados por el Laboratorio de Agricultura y Biotecnologia de la FAO/IAEA, Seibersdorf, Austria. Un numero de razas que separara los sexos geneticamente fueron utilizadas para producir solo machos para la liberacion. La congestionada condicion inicial para criar las moscas y su manejo de calidad fueron aliviadas en 2001 con la construccion de un nuevo cuarto de cria para adultos y un laboratorio de control de calidad. En 2002, un Sistema de Manejo de Calidad comprensivo fue implementado, y en 2003 una raza mejorada que separa los sexos geneticamente, VIENNA 8, fue proveido por el Laboratorio de la FAO/IAEA en Seibersdorf. En la mayor parte de los primeros 3 anos la facilidad no pudo suplir el numero requerido de machos esteriles de la mosca mediterranea de la fruta para el programa de TIE sin la necesidad para importar machos esteriles de otra facilidad. Desde medio del ano de 2002, despues que el sistema de manejo de calidad fue implementado, la produccion y la calidad mejoraron pero aun quedaron por debajo del nivel optimo. Despues de la introduccion de la raza VIENNA 8 que separa los sexos geneticamente, y junto con el equipo mejorado de control de clima, la estabilidad y los parametros de seguridad de calidad mejoraron substancialmente. Los factores criticos que influyeron en la produccion y la calidad fueron la infraestructura inadecuada para criar las moscas, problemas con la calidad de la dieta para las larvas y la ausencia inicial de un sistema de manejo de calidad. Los resultados muestran claramente la importancia de un manejo efectivo de la calidad, el valor de una raza productiva que separa los sexos geneticamente y la necesidad de contar con una base solida de financimiento para la infraestructura de una

Ciencias 3. (Science 3). Student Book.

ERIC Educational Resources Information Center

Raposo, Lucilia

This grade 3 textbook, the third in a series of elementary science textbooks written in Portuguese, consists of readings, activities, and review exercises on biological, physical, geological, and nutrition/health concepts. The book is organized into nine sections. Among the topic areas included in these sections are: (1) solar energy, electricity,…

Ciencia: Nivel A (Science: Level A).

ERIC Educational Resources Information Center

Duron, Dolores; And Others

A teacher's manual was developed for an elementary level science course in Spanish as part of an immersion program for English speaking children. The Level A manual is designed for kindergarten and grade 1 pupils. The five units cover the basic concepts of the weather, colors, animals, plants, and the five senses. Each unit includes vocabulary,…

Illuminating Cell Biology

NASA Technical Reports Server (NTRS)

2002-01-01

NASA's Ames Research Center awarded Ciencia, Inc., a Small Business Innovation Research contract to develop the Cell Fluorescence Analysis System (CFAS) to address the size, mass, and power constraints of using fluorescence spectroscopy in the International Space Station's Life Science Research Facility. The system will play an important role in studying biological specimen's long-term adaptation to microgravity. Commercial applications for the technology include diverse markets such as food safety, in situ environmental monitoring, online process analysis, genomics and DNA chips, and non-invasive diagnostics. Ciencia has already sold the system to the private sector for biosensor applications.

[Diagnostic strategies in the Tuberculosis Clinic of the Hospital General La Raza National Medical Center].

PubMed

Flores-Ibarra, Alberto Alejandro; Ochoa-Vázquez, María Dolores; Sánchez-Tec, Georgina Alejandra

2016-01-01

In order to diagnose TB infection, tuberculin skin test and interferon gamma release assay are available. The tuberculin test has a sensitivity of 99 % and a specificity of 95 %. For the detection of interferon gamma in blood there are currently two tests available: TBGold QuantiFERON-In-Tube (with a sensitivity of 0.70 and a specificity of 0.90), and T-SPOT-TB (sensitivity 0.90 and specificity 0.93). To diagnose the disease, a microscopy of direct smears for acid-fast bacilli is used if the physician is facing an extensive cavitary lung disease due to M. tuberculosis (this test has a high sensitivity: 80-90 %). The most common staining techniques used are Ziehl-Neelsen and Kinyoun, and the fluorescent technique, auramine-rhodamine. The culture is the gold standard and it has a sensitivity of 80 % and a specificity over 90 %, but the results take weeks. The nucleic acid amplification test has an overall sensitivity and specificity of 0.85 and 0.97, respectively. In the presence of a pleural effusion is necessary to perform a pleural biopsy for culture with a sensitivity of 85 % if it is percutaneous and 98 % if it was taken by thoracoscopy. The adenosine deaminase can be determined in pleural fluid with a sensitivity and specificity of 95 %.

Science and technology disclosure in the state of Queretaro: Science and Technology for Children program

NASA Astrophysics Data System (ADS)

Contreras Flores, Rubén; Villeda Muñoz, Gabriel

2007-03-01

Science and technology disclosure is an integral part of our scientific work as researches; it is an induction process for children, young people and teachers of primary and secondary schools in the state of Queretaro. Education must be offered in a clear and objective way, it allows to the students apply the acquired knowledge to understand the world and improve his quality of life. Nowadays, the Centro de Investigacion en Ciencia Aplicada y Tecnologia Avanzada of the Instituto Politecnico Nacional Unidad Queretaro (CICATA-IPN Queretaro) together with the Consejo de Ciencia y Tecnologia del Estado de Queretaro (CONCYTEQ) have implemented the "Science and Technology for Children" program (Ciencia y Tecnologia para Ninos - CTN), it allows to the educative sector obtain information through the CONCYTEQ web page. The fist stage of the program was the development of two subjects: the brochure titled "Petroleum, Nonrenewable Natural Resource that Moves the World" and the manual "Experiments of Physics". At the moment we are working with the second stage of the program, it is about the energy generation using renewable sources such as: geothermal, aeolian, solar and biomass. The CTN program allows to students and teachers to create conscience about the importance of the development of the science of technology in our country.

Ciencia, Sociedad, Soluciones: Una Introduccion al USGS

USGS Publications Warehouse

,

2001-01-01

El USGS sirve a la nacion de los Estados Unidos proveyendo informacion fidedigna para ? Describir y comprender la Tierra; ? Minimizar la perdida de vidas y propiedades por desastres naturales; ? Manejar los recursos hidrologicos, biologicos, energeticos y minerales; y ? Mejorar y proteger nuestra calidad de vida.

[Pharmacists in transition. Academy and Pharmacy in Mexico from 1833 to 1865].

PubMed

Morales-Cosme, Alba Dolores; Viesca-Treviño, Carlos

2016-01-01

From the second half of the 19th century, health disciplines went through an institutional and professional restructuring, which progressively altered the guild order that had characterized them to that point. In the case of Pharmacy, this process implied the generation of officially recognized spaces, as the chairs of Pharmacy and Medical Substance, founded during the Establecimiento de Ciencias Médicas (Establishment of Medical Sciences) (1833). In those spaces it was sought to institutionalize knowledge and modern practices related to Pharmacy. In this work we look over the first academic experience of the pharmaceutical community in that new space of instruction, based on the records belonging to the students enrolled in the Establecimiento de Ciencias Médicas from 1833 to 1865, year of the enrollment of the last generation. The information contained in those 163 records displays the way the pharmaceutical field was transformed, after the aforementioned restructuring. The reader will notice the diverse normativity, which regulated the joining of pharmacists to academic life (of which, until then, they were excluded). He will also realize how, among the first students enrolled in the Establecimiento de Ciencias Médicas, said normativity was broke in order to adapt it to the known ways of students and professors. Progressively, the guild instruction would be ousted by the institutional instruction (for example, the years of practice in the drugstores were rejected), so that the guild ways of teaching were changing to turn the pharmacist into an individual of institutional instruction.

Experimental design and multiple response optimization. Using the desirability function in analytical methods development.

PubMed

Candioti, Luciana Vera; De Zan, María M; Cámara, María S; Goicoechea, Héctor C

2014-06-01

A review about the application of response surface methodology (RSM) when several responses have to be simultaneously optimized in the field of analytical methods development is presented. Several critical issues like response transformation, multiple response optimization and modeling with least squares and artificial neural networks are discussed. Most recent analytical applications are presented in the context of analytLaboratorio de Control de Calidad de Medicamentos (LCCM), Facultad de Bioquímica y Ciencias Biológicas, Universidad Nacional del Litoral, C.C. 242, S3000ZAA Santa Fe, ArgentinaLaboratorio de Control de Calidad de Medicamentos (LCCM), Facultad de Bioquímica y Ciencias Biológicas, Universidad Nacional del Litoral, C.C. 242, S3000ZAA Santa Fe, Argentinaical methods development, especially in multiple response optimization procedures using the desirability function. Copyright © 2014 Elsevier B.V. All rights reserved.

Ciencias 3. Caderno de Exercicios. (Science 3. Workbook).

ERIC Educational Resources Information Center

Raposo, Lucilia

This workbook contains 47 activities and exercises which reinforce lesson topics found in the grade 3 science textbook. These lesson topics, presented in nine sections in the textbook, focus on such areas as: (1) solar energy, electricity, and light; (2) solar system, planets, earth motions, and phases of the moon; (3) gravity, rocks, and erosion;…

Achieving Open Access to Conservation Science

PubMed Central

Fuller, Richard A; Lee, Jasmine R; Watson, James E M

2014-01-01

Conservation science is a crisis discipline in which the results of scientific enquiry must be made available quickly to those implementing management. We assessed the extent to which scientific research published since the year 2000 in 20 conservation science journals is publicly available. Of the 19,207 papers published, 1,667 (8.68%) are freely downloadable from an official repository. Moreover, only 938 papers (4.88%) meet the standard definition of open access in which material can be freely reused providing attribution to the authors is given. This compares poorly with a comparable set of 20 evolutionary biology journals, where 31.93% of papers are freely downloadable and 7.49% are open access. Seventeen of the 20 conservation journals offer an open access option, but fewer than 5% of the papers are available through open access. The cost of accessing the full body of conservation science runs into tens of thousands of dollars per year for institutional subscribers, and many conservation practitioners cannot access pay-per-view science through their workplace. However, important initiatives such as Research4Life are making science available to organizations in developing countries. We urge authors of conservation science to pay for open access on a per-article basis or to choose publication in open access journals, taking care to ensure the license allows reuse for any purpose providing attribution is given. Currently, it would cost $51 million to make all conservation science published since 2000 freely available by paying the open access fees currently levied to authors. Publishers of conservation journals might consider more cost effective models for open access and conservation-oriented organizations running journals could consider a broader range of options for open access to nonmembers such as sponsorship of open access via membership fees. Obtención de Acceso Abierto a la Ciencia de la Conservación Resumen La ciencia de la conservación es una

Fabrication of Nanolaminates with Ultrathin Nanolayers Using Atomic Layer Deposition: Nucleation & Growth Issues

DTIC Science & Technology

2009-02-01

Tecnologia de Superficies y Materiales (SMCTSM), XXVII Congreso Nacional, Oaxaca, Oaxaca, Mexico, September 26, 2007. 26. "Atomic Layer Deposition of...Nanolaminates: Fabrication and Properties" (Plenary Lecture), Sociedad Mexicana de Ciencia y Tecnologia de Superficies y Materiales (SMCTSM), XXVII

Thermophysical Modeling of Novel Machinable Ceramic Materials

DTIC Science & Technology

2009-11-01

ORGANIZATION REPORT NUMBER Gonzalo Gutierrez. Departamento de Fisica , Facultad de Ciencias. L’niversidad de Chile. Casilla 653, Santiago, Chile...Walter Orellana, Departamento de Fisica , Universidad Andres Belio, Chile www.gnm.cl 9. SPONSORING / MONITORING AGENCY NAME(S) AND ADDRESS(ES

Teaching and learning the geological knowledge as a part of the science education general field

NASA Astrophysics Data System (ADS)

Aguirre-Pérez, Constancio

2010-05-01

space sciences" emphasizes still further such character receiving the contributions of physics, chemistry, biology and environmental science in a kind of scientific-technical mixture which enriches the discipline itself and constitutes a fundamental basis for the evolution of knowledge in its broadest sense (Martinez Frias et al. 2008). In this paper we propose to show some of the experiences and didactic innovations in the teaching of geology found in the scientific literature in recent years and likewise part of an author's own work on the establishment of analogies on the time variable based on Carl Sagan's cosmic calendar. With these analogies we try to approximate geologic times to the understanding of high school and first university courses students (Aguirre-Perez, C. 2008) REFERENCES ALIBERAS, J. GUTIÉRREZ, R. and IZQUIERDO, M. (1989). La Didáctica de las Ciencias: Una empresa racional. Enseñanza de las Ciencias, 7 (3), pp. 227-284. GUTIÉRREZ, R. (1987). Psicología y aprendizaje de las Ciencias. El modelo de Ausubel. Enseñanza de las Ciencias, 5 (2), pp. 118-128. MARTÍNEZ FRÍAS, J. LUNAR, R. RODRÍGUEZ-LOSADA, J.A. EFF-DARWICH, A. and MADERO JARABO, J. (2008)"La Geología en la exploración planetaria (Geology inplanetary exploration). Geo-temas 10, pp. 1621-1624. PEDRINACI, E. (2000): La Enseñanza y el aprendizaje del conocimiento geológico. Didáctica de las Ciencias Experimentales. Teoría y Práctica de la Enseñanza de las ciencias, pp. 479-503. Ed. Marfil.

IPDO-2007 - Inverse Problems, Design and Optimization Symposium

DTIC Science & Technology

2007-12-01

454080, Russia 024 Alexandre Grebennikov Dr. Grebennikov Alexandre, 025 Facultad de Ciencias Fisico Matematicas , Benemerita Universidad Autonoma de...and Statistics UniversitA degli Studi di Milano via Conservatorio 7, 20122 MILANO ITALY 112 Nuno Fillipe Martins Nuno F. M. Martins Dept. Matematica Fac

Correction to: Cotinine: A Therapy for Memory Extinction in Post-traumatic Stress Disorder.

PubMed

Mendoza, Cristhian; Barreto, George E; Iarkov, Alexandre; Tarasov, Vadim V; Aliev, Gjumrakch; Echeverria, Valentina

2018-04-23

The original version of this article unfortunately contained mistake in its Funding inforation. That is, the Grant Number has an error currently read as "This work was supported by the Fondo de Ciencia y Tecnología (FONDECYT) de Chile, Grant #1150149".

An Elementary Proof of a Converse Mean-Value Theorem

ERIC Educational Resources Information Center

Almeida, Ricardo

2008-01-01

We present a new converse mean value theorem, with a rather elementary proof. [The work was supported by Centre for Research on Optimization and Control (CEOC) from the "Fundacaopara a Ciencia e a Tecnologia" FCT, co-financed by the European Community Fund FEDER/POCTI.

Mechanoelectrically Activated Synthesis of Dense, Bulk Nanostructured, Complex Crystalline and Glassy Hard Materials

DTIC Science & Technology

2005-04-01

Facultad de Quimica , Universidad Autonoma de Queretaro, Queretaro, Mexico, May 7, 2002. (Invited Seminar) "* Recent Advances in the Synthesis and...A. Munir, 14o Congresso Brasileiro de Engenharia e Ciencias dos Materiais (14th Brazilian Congress on Materials Science and Engineering), Sao Pedro

Prevalence of twin foaling and blood chimaerism in purebred Spanish horses.

PubMed

Anaya, G; Fernández, M E; Valera, M; Molina, A; Azcona, F; Azor, P; Solé, M; Moreno-Millán, M; Demyda-Peyrás, S

2018-04-01

Twin foaling is associated with chimaerism in several domestic species and is recognised in horses. In this study, 21,097 purebred Spanish (Pura Raza Español) horse births from the 2015 to 2016 breeding season were investigated for chimaerism. Twin foaled and chimaeric individuals were assessed on the basis of foaling records, short-tandem repeat (STR) parentage test results and a sex-linked STR-based technique. Fourteen twin pregnancies with 23 twin foals born alive were identified (0.066% twin foaling prevalence), including five blood chimaeric cases (21.7%; overall prevalence 0.011%), suggesting that this genetic condition is extremely low in horses. Furthermore, no true chimaeras were detected. This is the first large scale study analysing the occurrence of chimaerism in a horse population and the first assessment of twin foaling in purebred Spanish horses. Copyright © 2018 Elsevier Ltd. All rights reserved.

Juan Carlos D'Olivo: A portrait

NASA Astrophysics Data System (ADS)

Aguilar-Arévalo, Alexis A.

2013-06-01

This report attempts to give a brief bibliographical sketch of the academic life of Juan Carlos D'Olivo, researcher and teacher at the Instituto de Ciencias Nucleares of UNAM, devoted to advancing the fields of High Energy Physics and Astroparticle Physics in Mexico and Latin America.

A Literature Survey on Inverse Scattering for Electron Density Profile Determination. Volume II.

DTIC Science & Technology

1981-09-24

THE INVERSE SCATTERING PROBLEM4 FOR THE EQUAT ION Of ACOUSTIC$ AVILA, G.S.S. DEPT. DE MATEMATICA . INST. DE CIENCIAS EXATAS. UNIV. Of BRASILIA...of Colict support Portinari. Joao C. Departamento do Matematica . Pontificia Universidade Catolica do Rio de Janeiro, Rio do Janeiro. Brasil J. Math

Meteorological Factors Affecting Evaporation Duct Height Climatologies.

DTIC Science & Technology

1980-07-01

Italy Maritime Meteorology Division Japan Meteorological Agency Ote-Machi 1-3-4 Chiyoda-Ku Tokyo, Japan Instituto De Geofisica U.N.A.M. Biblioteca ...Torre De Ciencias, 3ER Piso Ciudad Universitaria Mexico 20, D.F. Koninklijk Nederlands Meteorologisch Instituu. Postbus 201 3730 AE Debilt Netherlands

Worldwide Population Structure in Cuvier’s Beaked Whales: Identification of Units for Conservation

DTIC Science & Technology

2008-09-01

Brito Montero, Museo Municipal de Ciencias Naturales y Arqueología de San Antonio, Chile; A. Llavona, Coordinador para o Estudio dos Mamíferos...Storia Naturale di Milano, Italy; M. Bruni and P. Piguet, Institute Oceanographique (MOM), Monaco; N. Barros, Mote Marine Lab, Sarasota, Florida, USA

Industry Views on the Ability of the U.S. Photovoltaics Industry to Compete in Foreign Markets.

DTIC Science & Technology

1981-09-15

Consejo Nacional de Ciencia y Tecnologia ) had agreed to them in principal. Details still remain to be resolved. The agency responsible for the fourth...project (Direccion General de Aprovechamiento de Aguas Salinas y Energia Solar) had not yet replied. Israel agreement Based upon discussions held with

Supplement: Proceedings XIth Latin American Congress of Surface Science and Its Applications (XI CLACSA)

NASA Astrophysics Data System (ADS)

Häberle, Patricio; Fuenzalida, Victor

2004-07-01

The 2003 Congreso Latinoamericano de Ciencia de Superficies y sus Aplicaciones (Latin American Congress of Surface Science and Its Applications) was held in Pucón, Chile, 7-12 December 2003. XI CLACSA is the continuation of a series of events that started in 1980. Until 1992, this series was called Simposio Latinoamericano de Física de Superficies (SLAFS). In recognition of the interdisciplinary nature of the field, starting in 1994 the meeting became CLACSA. The conference was organized by the Sociedad Latinoamericana de Ciencia de Superficies (SLACS) with the purpose of becoming a forum for the exchange of information associated with scientific research carried out in Latin America in the field of surface physics, systems of low dimensionality and areas related to condensed matter physics and science of materials. This scientific event has enjoyed a large participation from Latin American scientists, and has helped to stimulate the collaboration between researchers from Europe, Latin America and the United States.

PREFACE: Acknowledgements

NASA Astrophysics Data System (ADS)

2015-06-01

The organizers of the conference would like to thank for the support from the Physics Department and the Offce of Academic Affairs of the Centro de Investigación y de Estudios Avanzados and from the Consejo Nacional de Ciencia y Tecnología (Conacyt), projects 152574 and 166581.

Leadership in a Culture of Fitness in the Chilean Army

DTIC Science & Technology

2012-03-22

www.conacedrogas.cl/inicio/noticias 2.php?id=1413 January 2005. (accessed December 18, 2011). 30 Universia, “Los peligros del cigarro en la...juventud”, http://noticias.universia.cl/ciencia- nn-tt/noticia/2006/02/07/334348/ peligros -cigarro-juventud.html (accessed December 03, 2011). 31 Ibid. 32

Tropical Cyclone Wind Probability Forecasting for the Eastern North Pacific (EPWINDP).

DTIC Science & Technology

1982-04-01

INSTITUTO DE GEOFISICA DIRECTOR HONOLULU, HI 96822 U.N.A.M. BIBLIOTECA NATIONAL HURRICANE CENTER TORRE DE CIENCIAS, 3ER PISO NOAA, GABLES ONE TOWER CHAIRMAN...METEOROLOGY DEPT. CIUDAD UNIVERSITARIA 1320 S. DIXIE HWY. UNIVERSITY OF WISCONSIN MEXICO 20, D.F. CORAL GABLES, FL 33146 1225 W. DAYTON STREET

Adits, Caves, Karizi-Qanats, and Tunnels in Afghanistan: An Annotated Bibliography

DTIC Science & Technology

2005-11-30

Amphipoden from underground water in Afghanistan) (Betr. Höhlenfunde) (Studi sui Crostacei anfipodi LIII).” Memorie del Museo Civico de Storia Naturale ...Tunnels In Afghanistan 3/6/2006 51 Schmitz, H. 1959. “Contribution à l’Étude de la Faune d’Afghanistan. 19. Phoridae.” Broteria: Serie Ciencias

The Role of Educational Leadership on Participation in the Costa Rican National Program of Science and Technology Fairs at Escuela Abraham Lincoln in the Coastal Region

ERIC Educational Resources Information Center

Marquez, Fernando

2016-01-01

The purpose of this study was to identify the role that Costa Rican educational leaders play in implementing the National Program of Science and Technology Fairs (Programa Nacional de Ferias de Ciencia y Tecnologia [PRONAFECYT]) initiative. The study provides an examination of leadership practices, instructional strategies, and professional…

Encountering Nanotechnology in an Interactive Exhibition

ERIC Educational Resources Information Center

Murriello, Sandra E.; Knobel, Marcelo

2008-01-01

This article offers findings from a learning sciences-informed evaluation of a nanoscience and nanotechnology exhibition called Nano-Aventura (NanoAdventure), based on four interactive-collaborative games and two narrated videos. This traveling exhibition was developed in Brazil by the Museu Exploratorio de Ciencias for children and teenagers…

Nuclear Science Curriculum and Curriculum para la Ciencia Nuclear.

ERIC Educational Resources Information Center

American Nuclear Society, La Grange Park, IL.

This document presents a course in the science of nuclear energy, units of which may be included in high school physics, chemistry, and biology classes. It is intended for the use of teachers whose students have already completed algebra and chemistry or physics. Included in this paper are the objectives of this course, a course outline, a…

Libros de Ciencias en Espanol (Science Books in Spanish).

ERIC Educational Resources Information Center

Schon, Isabel

1998-01-01

Describes recently published children's books in Spanish that explain basic facts about animals; introduce students to ecology, the environment, popular inventions, and some of the world's most amazing structures; and entice the very young reader into nature. Titles are divided into the areas of biology, ecology, general science, earth and space…

Introduction to Life Science (Introduccion a la Ciencia Biologica).

ERIC Educational Resources Information Center

Barnhard, Diana; And Others

These materials were developed to meet an expressed need for bilingual materials for a secondary school Life Science Course. Eight units were prepared. These include the following topics: (1) Introduction to the Scientific Method; (2) The Microscope; (3) The Cell; (4) Single-celled Protists, Plants, and Animals; (5) Multicellular Living Things;…

La Ciencia de los Antiguos Mexicanos: Una Bibliografia Selecta

ERIC Educational Resources Information Center

Ortiz-Franco, Luis; Magana, Maria

1973-01-01

Fifty-five citations pertaining to the scientific and mathematic development of ancient Mexicans, particularly the Mayas, are given in this select bibliography. The introduction and descriptions of resource libraries in 8 States are in Spanish. (NQ)

Ciencias 3. Manual do Professor (Science 3. Teacher's Manual).

ERIC Educational Resources Information Center

Raposo, Lucilia

This teaching guide contains materials corresponding to those found in the nine sections of the grade 3 elementary science textbook. It also contains lesson objectives, instructional strategies, classroom activities, and evaluation methods. Among the topic areas found in the nine sections are: (1) solar energy, electricity, and light; (2) solar…

Desarrollo curricular, conciencia ambiental y tecnologia para estudiantes de intermedia: Una investigacion en accion

NASA Astrophysics Data System (ADS)

Rodriguez Ramos, Teresita

Se llevó a cabo una investigación en acción con los propósitos de 1) documentar las relaciones de las tecnologías de la información y la comunicación en las clases de ciencias de escuela intermedia como elemento de apoyo cuando se aborda el tema ambiental y sus conceptos pertinentes, a partir de las observaciones de la investigadora, así como las entrevistas y diarios reflexivos de los estudiantes de una escuela intermedia en la zona metropolitana, y luego 2) diseñar una unidad instruccional sobre el tema ambiental que integre actividades tecnologías para el curso de ciencias de la escuela intermedia según el modelo PROCIC y las observaciones que hayan iniciado los estudiantes participantes. Finalmente, se plantearon las implicaciones educativas para el currículo del Programa de Ciencias al instrumentar este modelo de unidad mediante PROCIC, e integrado la tecnología y el tema ambiental. Los hallazgos se analizaron y se categorizaron de acuerdo con las preguntas de investigación. El hallazgo principal de la investigación aborda las cuatro relaciones centrales en las que se articula la utilización de las tecnologías y sus aplicaciones en la clase de ciencias. Estas cuatro relaciones que recogen la posición de los estudiantes son: 1) Perspectiva de los estudiantes hacia la tecnología. 2) Participación de los estudiantes en los aspectos docentes. 3) Aprendizaje estudiantil sobre el ambiente, y 4) Conciencia ambiental en relación con la vida diaria. Estas relaciones ponen de manifiesto,cómo se plantea en las implicaciones, la necesidad de más investigación en acción en la sala de clases, la importancia—como tema transversal—de la conciencia ambiental mediante la tecnología al construir conocimientos significativos dentro y fuera de la escuela, asó como, valorar la investigación y la dialogicidad en la sala de clases como actividades que obligan al reexamen de la práctica didáctica en su formas curriculares de objetivos, recursos

The Geography Olympiad in Mexico

ERIC Educational Resources Information Center

Garcia-Garcia, Fernando

2007-01-01

The formal organisation of science Olympiads in Mexico dates from 1987, when a national contest on Mathematics was held in order to identify a team to represent the country in the International Mathematics Olympiad. In 1991, the Mexican Academy of Sciences ("Academia Mexicana de Ciencias"-AMC) created the National Science Olympiads…

International Conference on Defects in Semiconductors (16th) Held in Bethlehem, Pennsylvania on 22-26 July 1991

DTIC Science & Technology

1992-04-30

SILICON S.J.SFERCO-, M.C.G.PASSEGGI" and M.A.CARAVACA*" "INTEC, Casilla de Correo 91, 8000-Santa Fe, ARGENTINA. "Facultad e Ciencias Ezactas y... Naturales y Agrimenaura, 94,00- Corrientes, ARGENTINA. Electronic Structure and Electric Field Gradient (EFG) calculations for the single Cd impurity in

Exploratory Learning with Geodromo: Design of Emotional and Cognitive Factors within an Educational Cross-Media Experience

ERIC Educational Resources Information Center

Bidarra, Jose; Martins, Olimpio

2011-01-01

In this paper we present Geodromo, a prototype of an educational multimedia system, part of the Portuguese "Ciencia Viva" (Live Science) educational program, which is aimed at young people and designed with innovative characteristics. The project is based on a robotic multimedia simulator and an online puzzle game aimed at the…

Impact of Culturally Relevant Contextualized Activities on Elementary and Middle School Students' Perceptions of Science: An Exploratory Study

ERIC Educational Resources Information Center

González-Espada, Wilson; Llerandi-Román, Pablo; Fortis-Santiago, Yaihara; Guerrero-Medina, Giovanna; Ortiz-Vega, Nicole; Feliú-Mójer, Mónica; Colón-Ramos, Daniel

2015-01-01

Although researchers have argued that textbooks should be customized to local cultures and experiences, they rarely are. Ciencia Puerto Rico, a non-profit group interested in promoting science literacy and education among Latino(a)s/Hispanics, identified a need to provide schools with culturally relevant materials. The result was the publication…

Pensando en Cynthia y su Hermana: Educational Implications of United States-Mexico Transnationalism for Children

ERIC Educational Resources Information Center

Hamann, Edmund T.; Zuniga, Victor; Garcia, Juan Sanchez

2006-01-01

We use 3 brief educational biographies of students in Mexico who have previously attended public school in the United States to introduce this literature review on United States-Mexico transnational students. This article is also the first of several planned articles stemming from a currently ongoing, Consejo Nacional de Ciencia y…

El contexto de la familia y el vecindario en la salud de los ancianos del estudio EPESE hispano

PubMed Central

Reyes-Ortiz, Carlos A.; Camacho, María E.; Eschbach, Karl; Markides, Kyriakos S.

2014-01-01

RESUMEN En este artículo se discute el papel de la familia y el vecindario en la salud de los ancianos méjico-americanos del estudio EPESE (Established Populations for Epidemiologic Studies of the Elderly) hispano. La paradoja epidemiológica consiste en que, a pesar de estar en desventaja socioeconómica, los ancianos hispanos tienen mortalidad relativamente menor que los ancianos de raza blanca. Esto es especialmente cierto cuando el anciano vive en los vecindarios donde hay un porcentaje alto de méjico-americanos. La familia también juega un papel importante en estos ancianos al disminuir el riesgo de institucionalización o de morbilidad. Asimismo, el estrés originado en problemas económicos o al depender económicamente de la familia, habiendo inmigrado en edades tardías, puede sobrepasar la capacidad de amortiguamiento del estrés y afectar la salud del anciano méjico-americano. PMID:25190897

[Surgical correction of cleft palate].

PubMed

Kimura, F T; Pavia Noble, A; Soriano Padilla, F; Soto Miranda, A; Medellín Rodríguez, A

1990-04-01

This study presents a statistical review of corrective surgery for cleft palate, based on cases treated at the maxillo-facial surgery units of the Pediatrics Hospital of the Centro Médico Nacional and at Centro Médico La Raza of the National Institute of Social Security of Mexico, over a five-year period. Interdisciplinary management as performed at the Cleft-Palate Clinic, in an integrated approach involving specialists in maxillo-facial surgery, maxillar orthopedics, genetics, social work and mental hygiene, pursuing to reestablish the stomatological and psychological functions of children afflicted by cleft palate, is amply described. The frequency and classification of the various techniques practiced in that service are described, as well as surgical statistics for 188 patients, which include a total of 256 palate surgeries performed from March 1984 to March 1989, applying three different techniques and proposing a combination of them in a single surgical time, in order to avoid complementary surgery.

Salud Para Su Corazon-NCLR: a comprehensive Promotora outreach program to promote heart-healthy behaviors among hispanics.

PubMed

Balcazar, Hector; Alvarado, Matilde; Hollen, Mary Luna; Gonzalez-Cruz, Yanira; Hughes, Odelinda; Vazquez, Esperanza; Lykens, Kristine

2006-01-01

This article describes results of year-1 implementation of the Salud Para Su Corazón (Health For Your Heart)-National Council of la Raza (NCLR) promotora (lay health worker) program for promoting heart-healthy behaviors among Latinos. Findings of this community outreach initiative include data from promotora pledges and self-skill behaviors, cardiovascular disease risk factors of Latino families, family heart-health education delivery, and program costs associated with promotora time. Participation included 29 trained promotoras serving 188 families from three NCLR affiliates in Escondido, California; Chicago, Illinois; and Ojo Caliente, New Mexico. Using several evaluation tools, the results showed that the promotora approach worked based on evidence obtained from the following indicators: changes in promotora's pre-post knowledge and performance skills, progress toward their pledge goals following training, recruiting and teaching families, providing follow-up, and organizing or participating in community events. Strengths and limitations of the promotora model approach are also discussed.

Species Profiles: Life Histories and Environmental Requirements of Coastal Fishes and Invertebrates (South Florida): Black, Red and Nassau Groupers

DTIC Science & Technology

1989-08-01

Venezuela. Fundacion La Salle de 6200. 54 pp. Ciencias Naturales . Caracas, Venezuela. 951 pp. Deue], D.G., and j.R. Clark. 1968. The Coln, P.L. 1982...Baltimore, Md. 05 pp. Colombia. Instituto de Desarrollo de los Recursos Naturales , Bogota, Colombia. 391 pp. Goodyear, C.P. 1988. The Gulf of Mexico fishery

The Eratosthenes Space Project

ERIC Educational Resources Information Center

Artigas, A.; Costa, A.; Eyraud, C. H.; Perez-Verde, A.; Ros, R. M.

2011-01-01

The European Association for Astronomy Education (EAAE), in collaboration with the Bibliotheca Alexandrina of Egypt and the participation of schools from all around the world, performed the Eratosthenes experiment on 21 June 2010. This activity has been selected as one of the finalists in the 11th international prize organized by Ciencia en…

Basic Training Programme for Library Technicians in Mexico.

ERIC Educational Resources Information Center

Vilentchuk, Lydia

The Consejo Nacional de Ciencia y Tecnologia (CONACYT), set up in 1971 to further scientific and technological advancement in Mexico, commissioned this determination of the steps necessary to promote the use of libraries and recorded scientific and technical information, and to foster the reading habits of the population. A brief overview examines…

Erratum: Erratum to: "A higher-spin Chern-Simons theory of anyons"

NASA Astrophysics Data System (ADS)

Boulanger, N.; Sundell, P.; Valenzuela, M.

2017-09-01

In the published version there is an error in the affiliation (the word "Andre's" with accent) of the author Per Sundell. The present form in this erratum is the correct (should be the word "Andres" without accent). The affiliation under the symbol " b" should read: Departamento de Ciencias Físicas, Universidad Andres Bello, Santiago, Chile

The Hemiptera type-material housed in the "Museu de Ciências Naturais, Fundação Zoobotânica do Rio Grande do Sul" of Porto Alegre, Brazil.

PubMed

Ruschel, Tatiana Petersen; Guidoti, Marcus; Barcellos, Aline

2013-01-01

We provide a commented and referenced list on the type material deposited in the "Museu de Ciencias Naturais, Fundação Zoobotânica do Rio Grande do Sul", Porto Alegre, Brazil. Geographic coordinates are available on a digital repository for free access. High-resolution images of the specimens are available under request.

NATO Advanced Research Workshop. Toughening Mechanisms in Quasi-Brittle Materials, Held in Evanston, Illinois on July 16-20, 1990

DTIC Science & Technology

1990-07-20

Planas, J. and Elices, M., "Un Nuevo Mdtodo de An~lisis del Comportamiento Asint6tico de la Propagaci6n de una Fisura Cohesiva en Modo ", Anales de...crack in mode I loading", Report 87-02, Departamento de Ciencia de Materiales , ETS de Ingenieros de Caminos, Ciudad Universitaria, 28040 Madrid, Spain

Workshop Proceedings: Toughening Mechanisms in Quasi-Brittle Materials Held on 16-20 July 1990 in Evanston, Illinois

DTIC Science & Technology

1991-05-05

2] Planas, J. and Elices, M., "Un Nuevo Mdtodo de An6lisis del Comportamiento Asint6tico de la Propagaci6n de una Fisura Cohesiva en Modo I...cohesive crack in mode I loading", Report 87-02, Departamento de Ciencia de Materiales , ETS de Ingenieros de Caminos, Ciudad Universitaria, 28040 Madrid

Solution of the General Helmholtz Equation Starting from Laplace’s Equation

DTIC Science & Technology

2002-11-01

infinity for the two dimensional case. For the 3D the general form case, this term does not exist, as the potential at infinity is zero. Hence the Green’s...companies. She has assisted the Comisi6n the Living System Laboratory, Interministerial de Ciencia y Tecnologia (National LG Electronics, From 1998 to 2000

Discussion Meeting on Thermodynamics of Alloys Held in Sant Feliu de Guixols, Spain on 23-26 May 1990. Abstracts

DTIC Science & Technology

1990-05-26

OFFICE OF THE U.S. ARMY EUROPEAN RESEARCH OFFICE OF THE U.S. AIR FORCE MINISTERIO DE EDUCACION Y CIENCIA I I Wednesday, May 23 8.30 Registration 9.00... especially regarding the structural but less the thermodynamic proper- ties). The third binary system Ag-Te has been investigated in detail by our group. No

Semi-analytical modelling of positive corona discharge in air

NASA Astrophysics Data System (ADS)

Pontiga, Francisco; Yanallah, Khelifa; Chen, Junhong

2013-09-01

Semianalytical approximate solutions of the spatial distribution of electric field and electron and ion densities have been obtained by solving Poisson's equations and the continuity equations for the charged species along the Laplacian field lines. The need to iterate for the correct value of space charge on the corona electrode has been eliminated by using the corona current distribution over the grounded plane derived by Deutsch, which predicts a cos m θ law similar to Warburg's law. Based on the results of the approximated model, a parametric study of the influence of gas pressure, the corona wire radius, and the inter-electrode wire-plate separation has been carried out. Also, the approximate solutions of the electron number density has been combined with a simplified plasma chemistry model in order to compute the ozone density generated by the corona discharge in the presence of a gas flow. This work was supported by the Consejeria de Innovacion, Ciencia y Empresa (Junta de Andalucia) and by the Ministerio de Ciencia e Innovacion, Spain, within the European Regional Development Fund contracts FQM-4983 and FIS2011-25161.

The Colombian Remote Sensing Program,

DTIC Science & Technology

refer to are: Plan de Integracion Nacional, (PIN), Programa de Desarrollo Rural Integrado, (DRI), Plan Nacional de Alimentacion y Nutricion (PAN) and... Politica Nacional de Ciencia y Tecnologia. The goals and organization of the program are presented in the last part of this report, together with the description of those activities deemed necessary for performing them.

Dynamics of Electron Transfer for a Nonsuperexchange Coherent Mechanism. I

DTIC Science & Technology

1989-10-13

observation. In the treatment three collective nuclear coordinates are introduced, permitting independent reorganization energies for each reactive center... nuclear coordinates are introduced, permitting independent reorganization energies for each reactive center. With certain approximations, namely, equal...numerically. One rough but simple analytical result for the latter is also given. tPresent address: Departmento de Quimica , Facultad de Ciencias

The Electroplastic Effect in Metals.

DTIC Science & Technology

1984-05-11

the pinch effect. The differ- oulses (%&0A/mm2 for ^-50iis duration) on the flow ence Acp-Anp (Fig. 4r) should then consist prima - * stress of a number...Silveira, R. A. F. 0. Fortes and W. Rvzhkov, Dokl. Akad. Nauk. SSSR 243 330-333 A. Mannheimer, 5th Congr. Brasileiro Eng. (1978). Ciencia Materias (Dec. 1982

The Education of the Active Televiewer of School Age.

ERIC Educational Resources Information Center

Munoz, Patricio Calderon; Torres, Miguel Reyes

In response to a series of problem symptoms related to the influence of television on students, a team of professors at the Universidad de Playa Ancha de Ciencias de la Educacion in Chile undertook a project designed to train television viewers to become critical viewers of the medium. Specific objectives of the project included: (1) to design a…

LIS Education in Portugal between Academia and Practice

ERIC Educational Resources Information Center

Ribeiro, Fernanda

2008-01-01

There is a brief exposition, in a historical perspective, about the evolution of the professional education in Portugal, in the area of Library and Information Science, since the creation of the Curso de Bibliotecario-Arquivista, in 1887, until its closure in 1982, when it was replaced by the Curso de Especializacao em Ciencias Documentais (CECD).…

The Astronomy Club of Araranguá: Educating Science Teachers as Science Communicators. (Breton Title: Clube de Astronomia de AraranguÁ: a Formação de Professores de Ciências Como Divulgadores Científicos. ) Club de Astronomía de Araranguá: la Formación del Profesorado Como Comunicadores de la Ciencia

NASA Astrophysics Data System (ADS)

Damasio, Felipe; Allain, Olivier; Antunes Rodrigues, Adriano

2013-07-01

-se na Teoria da Aprendizagem Significativa, sempre procurando alcançar a pré-disposição em aprender e produzir material potencialmente significativo, as duas condições necessárias para que a aprendizagem significativa ocorra. El estudio relatado en este trabajo se lleva a cabo desde 2009 en el Instituto Federal de Educação, Ciência e Tecnología de Santa Catarina, campus Araranguá. En él se busca formar a comunicadores de la ciencia durante la formación inicial de los docentes Licenciatura en Ciencias Naturales con especialidad en Física, y también promover acciones de divulgación científica para el público en general en la región de Araranguá a través de un club de astronomía llamado CA2 (Clube de Astronomia Araranguá). Entres las acciones de los estudiantes que se promueven están: producción de videos, programas de radio, conferencias, observaciones nocturnas, la preparación y exposición de carteles, la educación en física para los niños, actividades de formación permanente del profesorado y enseñanza de la física de con el tema generador Astronomía. El trabajo de la formación del profesorado y la difusión de club científico se basa en la teoría del aprendizaje significativo, buscando siempre la predisposición para aprender y producir material potencialmente significativo, las dos condiciones necesarias para que ocurra el aprendizaje significativo.

Science Is "Ciencia": Meeting the Needs of Hispanic American Students.

ERIC Educational Resources Information Center

Rakow, Steven J.; Bermudez, Andrea B.

1993-01-01

Reviews some of the factors known to influence the achievement and retention of Hispanic Americans in technologically related fields. Discusses directions in which research should focus to meet the needs of Hispanic-American students. (PR)

Lenguaje y Ciencias (Language and Sciences), Vol. 17, No. 3.

ERIC Educational Resources Information Center

Zierer, Ernesto, Ed.

This issue contains two articles in Spanish and three in English on the following topics: the practical presentation of English for Special Purposes (ESP) materials in science programs at the National University of Trujillo, "notional syllabus" and "discourse analysis" in relation to ESP materials, extra-linguistic principles in explaining…

Lenguaje y Ciencias (Language and Sciences), Vol. 17, No. 2.

ERIC Educational Resources Information Center

Zierer, Ernesto, Ed.

This issue contains three articles in Spanish, with abstracts in English, dealing with the following topics: (1) technical and scientific language; (2) some types of misrenderings by students in translating from English to Spanish and implications for language instruction; and (3) some theoretical aspects of the formation of technical terms in…

Libros de Ciencias en Espanol (Science Trade Books in Spanish).

ERIC Educational Resources Information Center

Schon, Isabel

1999-01-01

Presents a list of recently published science books in Spanish. Each entry in the annotated bibliography contains publication information, suggested grade level(s), and a brief description of the publication. Books are listed under the categories of Biology, Physical Science, General Science, and For the Very Young. Also includes references and…

Unas opciones para muestras de la naturaleza

Treesearch

Frank H. Wadsworth

2009-01-01

La ciencia, incluso la de Puerto Rico, aprende de muestras, su interpretación y extrapolación a situaciones más extensas. Las muestras de la naturaleza de Puerto Rico: las del suelo, la hojarasca, la sombra, la biomasa, los árboles, las aves, los reptiles y anfibios, o los insectos caracterizan los ecosistemas. [article in Spanish

Curves and Surfaces

DTIC Science & Technology

1990-01-01

Morten Dohlen Center for Industrial Rcsearch(SI), Box 124 Blindern, 0314 Oslo 3, Norway. Abstract. The combination of refinement and decomposition...of Technology Faculty of Industrial Design Engineering Section Mechanical Engineering Design Jaffalaan 9 NL-2628 BX Delft The Netherlands louwe...OF A GIVEN SET OF POINTS Leonardo Traversoni Dominguez Division de Ciencias Basicas e Ingenieria Universidad Autonoma Metropolitana (Iztapalapa) ap

Robust Self-Authenticating Network Coding

DTIC Science & Technology

2008-11-30

efficient as traditional point-to-point coding schemes 3m*b*c*ts»tt a«2b»c*dt4g »4.0»C* 3d *Sh Number of symbols that an intermediate node has to...Institute of Technology This work was partly supported by the Fundacao para a Ciencia e Tecnologia (Portuguese foundation lor Science and Technology

Posture Statement of General Douglas M. Fraser, United States Air Force Commander, United States Southern Command, Before the 112th Congress House Armed Services Committee

DTIC Science & Technology

2012-03-06

1 Aravena, F. Confianza: base para la gobernabilidad y la convivencia democrática en América...Latinoamericano de Ciencias Sociales (FLACSO). 3 Joint Interagency Task Force South (JIATF South), our key component in detection and monitoring of illicit...Central America’s north, the government of Mexico has fully committed to reducing the power and impunity of transnational organized crime and drug

2009: the year of living dangerously

NASA Astrophysics Data System (ADS)

Del Puerto, C.

2011-11-01

Tenerife is not Jakarta. Neither is 2009 the year 1965, nor the Museo de la Ciencia y el Cosmos (Museum of Science and the Cosmos) the hotel "Indonesia", meeting point of reporters from around the world. Nor am I the journalist Jill Bryant (Sigourney Weaver) in the Australian Peter Weir film. But 2009, a year of international commitment to Astronomy (and wild economic crisis budget cuts), will be a time in space that many people will remember for how we live, what problems we face and what tools we used to discover together the Universe. Stimulating interest in the stars was our goal in the museum. Playing with all the colours of a filter wheel, our strategy. Energy and creativity were our available resources. We had to innovate and not die trying. Finally, mainstreaming was the concept, the philosophy, in exchange for bold value and ineffable endeavor. The Museo de la Ciencia y el Cosmos accepted the challenge, explored new resources for science communication and made risky bets, many of them hand in hand with the Instituto de Astrofísica de Canarias (IAC). A year later, we value the role of this museum in the film.

Magnetic Resonance Project 35-26-7: A Cuban Case of Engineering Physics and Biophysics

NASA Astrophysics Data System (ADS)

Cabal Mirabal, Carlos A.

The Magnetic Resonance Project 35-26-7 started in December 1987, commissioned by the [then] Cuban Prime Minister, Fidel Castro, who—concerned about introducing technological advancement into the Cuban health [system]—had for some months taken an interest in the possibility of building magnetic resonance imaging (MRI) equipment for medical diagnosis in Cuba (Zito M, Argüelles MM et al, Y sin embargo-: ciencia: hablan 30 investigadores cubanos. Editoria April, Habana, pp 56-66, 1999; Cabal, Biofísica Médica. In: Fidel Castro Dìas-Balart (eds) Cuba. Amanecer del Tercer Milenio. Ciencia, Sociedad y Tecnología: Biofísica Médica. Debate Editorial, Madrid, pp 31-48, 2002). Many of the companies producing MRI equipment were unable to deliver this technology to Cuba due to the bloqueo, the United States embargo against Cuba. Those who were later to advance the project's progress in scientific technology initially regarded the implementation of such a project in a developing country as unfeasible due to its complexity. But Fidel's belief and confidence and in turn the Cuban scientists' commitment to him and to Cuban science proved to be an undeniable factors for its success.

Making Sense of Plant Health

NASA Technical Reports Server (NTRS)

2001-01-01

Ciencia, Inc. created a new device, known as a Portable Photosynthesis Analyzer, or Phase Fluorometer, that provides real-time data about the photochemical efficiency of phytoplankton and other plant forms. The commercial version of this technology is used for photosynthesis research and offers major benefits to the field of life science. This new instrument is the first portable instrument of its kind. Through a license agreement with Ciencia, Oriel Instruments, of Stratford, Connecticut, manufactures and markets the commercial version of the instrument under the name LifeSense.TMLifeSense is a 70 MHz single-frequency fluorometer that offers unrivaled capabilities for fluorescence lifetime sensing and analysis. LifeSense provides information about all varieties of photosynthetic systems. Photosynthesis research contributes important health assessments about the plant, be it phytoplankton or a higher form of plant life. With its unique sensing capabilities, LifeSense furnishes data regarding the yield of a plant's photochemistry, as well as its levels of photosynthetic activity. The user can then gain an extremely accurate estimate of the plant's chlorophyll biomass, primary production rates, and a general overview of the plant's physiological condition.

"One of the Most Uniform Races of the Entire World": Creole Eugenics and the Myth of Chilean Racial Homogeneity.

PubMed

Walsh, Sarah

2015-11-01

This article illuminates why Nicolás Palacios's 1904 monograph, Raza chilena: Libro escrito por un Chileno i para los Chilenos [Chilean Race: A Book Written by a Chilean for Chileans], is central to the creation of a myth of Chilean racial homogeneity at the turn of the twentieth century. Placing Palacios in the context of Latin American eugenic discourse, it demonstrates how he selected a specific racial origin story in order to accommodate his belief in racial hierarchy while also depicting race mixing in a positive light. Specifically, the article highlights how the myth of Chilean racial homogeneity elided the difference between the term "mestizo," which was applied to people of mixed racial heritage, and "white." I contend that Palacios sought to differentiate Chileans from other Latin Americans by emphasizing their racial distinctiveness. The article therefore highlights that Latin American eugenics was concerned with the creation of national narratives that historicized particular racial mixtures in order to reify and affirm national differences. As such, it connects to literature regarding the history of eugenics, race, nation, and the creation of whiteness.

[Not Available].

PubMed

Curilem Gatica, Cristian; Almagià Flores, Atilio; Rodríguez Rodríguez, Fernando; Yuing Farias, Tuillang; Berral de la Rosa, Francisco; Martínez Salazar, Cristian; Jorquera Aguilera, Carlos; Bahamondes Ávila, Carlos; Soís Urra, Patricio; Cristi Montero, Carlos; Bruneau Chávez, José; Pinto Aguilante, Juan; Niedmann Brunet, Luis

2016-06-30

El índice de masa corporal (IMC) otorga uno de los índices más usados para determinar el estado nutricional de la población a nivel mundial, donde a pesar de existir recomendaciones claras y definidas para su interpretación como el sexo, edad, raza, entre otros, normalmente se estandariza su clasificación, independiente de las variables, aumentando el error en el resultado y en la clasificación del estado nutricional.El uso de la composición corporal a través de la antropometría entrega mayor información que el IMC, siendo la masa grasa y la masa muscular los principales resultados útiles.Este artículo presenta una revisión de las ecuaciones existentes y propone aquellas más simples y con menor error de estimación para ser usadas como una herramienta que reemplace o complemente al IMC, favoreciendo una mejor comprensión e interpretación del estado nutricional y nivelde actividad física en niños y adolescentes.

[Physicians, prostitution, and venereal disease in Colombia (1886-1951)].

PubMed

Obregón, Diana

2002-01-01

The article examines the Colombian medical field's fight against so-called venereal diseases between 1886 and 1951, a period when the country was undergoing processes of urbanization, population growth, and the emergence both of industry as well as of a middle class and an urban proletariat. Physicians found a close connection between the spread of syphilis and gonorrhea and the rise of prostitution in cities. At the close of the 19th century, doctors and public health bodies assumed prostitution was inevitable. In 1907 they managed to have it legalized and they opened clinics to dispense mercury therapy and treatment with arsenic compounds. Starting in the 1930s amd 1940s, treatment of venereal diseases was viewed as the State's duty, necessary to protect "la raza" and safeguard progress and civilization. As of 1950, the efficient use of penicillin once again caused the question of prostitution to be posed in more moral and aesthetic terms and brought an end to the regulations groverning its practice, at least in Bogota.

Nitrogen Rings and Cages Stabilized by Metallic Atoms

DTIC Science & Technology

2009-12-18

1 UNIVERSIDAD DE GUANAJUATO DEPARTAMENTO DE QUIMICA DIVISION DE CIENCIAS NATURALES Y EXACTAS Dr. Gabriel Merino NORIA ALTA s/n...this collection of information is estimated to average 1 hour per response, including the time for reviewing instructions, searching existing data...collection of information if it does not display a currently valid OMB control number. PLEASE DO NOT RETURN YOUR FORM TO THE ABOVE ADDRESS. 1 . REPORT

Ptychadena in Mauritania and the first record of Ptychadena schillukorum.

PubMed

Sánchez-Vialas, Alberto; Calvo-Revuelta, Marta; Márquez, Rafael

2017-01-01

The study of specimens of the genus Ptychadena of the herpetological collection of the Museo Nacional de Ciencias Naturales de Madrid reveals the first record of Ptychadena schillukorum from Mauritania, extending the known distribution range of the species in West Africa more than 450 km northwards. A key is provided for the four Mauritanian species of Ptychadena to solve problems in identification encountered in previous studies.

Physical and Chemical Data Report.

DTIC Science & Technology

1980-06-15

FISHERIES RESEARCH AND DEVELOPMENT BIBLIOTECA . INSTITUTO BEL MAR AGENCY APARTADO POSTAL 22 16-2KA, HARNANG )ONG CALLAO YOUNGDO-KU SUSAN 606 PERU KOREA... BIBLIOTECA SUBSCRIPTION DEPARTMENT INSTITUTO NACIONAL BE PESCA NEW SOUTH MALES GOVERNMENT OFFICES CENTRO BE INVESTIGACION PESQUERA 66 STRAND APARTADO...POSTAL 1366 LONDON, UC2N 5LZ, ENGLAND ENSERAA, BAJA CALIFORNIA UNITED KINGDOM Mexico LIBRARY BIBLIOTECA FISHERIES LABORATORY UNIAD BE CIENCIAS MARINAS

On the Existence of a Free Boundary for a Class of Reaction-Diffusion Systems.

DTIC Science & Technology

1982-02-01

I. Diaz. "Soluciones con soporte compacto para alguno. problemas semilineales". Collect. Math. 30 (1979), 141-179. -26- [121 J. I. Diaz. Tecnica de ...supersoluciones locales para problemas estacionarios no lineales: applicacion al estudio de flujoe subsonicos. Memory of the Real Academia de Ciencias...nonlinearity, nonlinear boundary conditions, dead core set, chemical reactions Work Unit Number I - Applied Analysis (1) Seccion de Matematicas

International Workshop on Non-Crystalline Solids (3rd) Held in Matalascanas, Spain on November 5-8, 1991. Programme and Abstracts

DTIC Science & Technology

1991-11-01

CSIC. Universidad Sevilla A. Conde (Chairman) C.F. Conde A. Criado J. Leal M. Miln H. Miranda SPONSORS MINISTERIO DE EDUCACION Y CIENCIA JUNTA DE...DMS experiments leads to physical understanding of the different aspects of the observed phenomena : more especially shape, amplitude and displacement... especially light transmittance were also established. The analysis of Raman spectra of the examined glasses has revealed the presence of metaphosphate

Anopheles (Anopheles) pseudopunctipennis Theobald (Diptera: Culicidae): Neotype Designation and Description

DTIC Science & Technology

2004-01-01

de- scribed from different areas of South America, includ- ing Ecuador, Colombia, Chile , and Argentina. Three names thatwere applied to this species...Especiales de Salud, Bogota, Colombia (DMB), Instituto Biologie “Juan Noe,” Santiago, Chile (IZC), Museo Argentino de Ciencias Naturales, Buenos Aires...Anopheles) pseudopunctipennis ssp. neghmei Mann 1950: 34 (M, F*, L*, E*). Type: Ouebrada de Minemine, Tarapaca, Chile (IZC). Anopheles (Anopheles

[A prima constitutione foetus. The wit theory as a natural faculty in some medical sources of the late Renaissance].

PubMed

Bigotti, Fabrizio

2013-01-01

After publication of the Examen de ingenios para la ciencias of Juan Huarte de San Juan (Baeza 1575), Galen's theories on the inheritance of character traits were strongly recovered, especially in Italy, both by physician and philosophers. In this way it has been established an analogy between the natural generation and intellectual generation which will be the basis of seventeenth-century attempts to naturalize the mind.

Quantum Phases at the Nanoscale

DTIC Science & Technology

2002-07-20

Sapienza" Roma. (Ital)y and Consejo perpendicular magnetic field, independent Nacional de Investigaciones Cientificas y electrons occupy Landau levels...Electromodulation of charge transfer and Departamento de Fisica Teorica de la the breathing mode of C60 on graphite Materia Condensada, Spain Miriam del...Instituto de Ciencia de Materiales de Madrid- epitaxial ferromagnetic metal [4], exhibiting CSIC. Spain coherent dynamics that persist over time scales

The Brazilian Military: Its Role in Counter-Drug Activities

DTIC Science & Technology

1992-06-01

34Police Uncover ’New’ Medellin Cartel Drug Route," Brasilia Radio Nacional de Amazonia , in Portuguese, 29 November 1989, translated in FBIS, 30...42 "Destruction of Clandestine Airstrips to Begin," Brasi Radio Nacional de Amazonia Network, in Portuguese, 2 May 1990, translated in FBIS, 3 May... de Ciencia Politica e Relacoes Internacionais (REL) Universidade de Brasilia 70.910 Brasilia, D.F. BRAZIL 107

Science News for the U.S. Hispanic Audience

NASA Astrophysics Data System (ADS)

Showstack, Randy

2008-02-01

A science and health news service targeted toward the U.S. Hispanic community was launched on 23 January. ConCiencia, billed as the first Spanish-language science newswire service in the United States, provides free weekly news feeds to media targeting the U.S. Hispanic population. The news feeds, available to Spanish-language newspapers and radio stations, include newspaper features, radio segments, and online news content.

The case for policy-relevant conservation science

PubMed Central

Rose, David C

2015-01-01

Drawing on the “evidence-based” (Sutherland et al. 2013) versus “evidence-informed” debate (Adams & Sandbrook 2013), which has become prominent in conservation science, I argue that science can be influential if it holds a dual reference (Lentsch & Weingart 2011) that contributes to the needs of policy makers whilst maintaining technical rigor. In line with such a strategy, conservation scientists are increasingly recognizing the usefulness of constructing narratives through which to enhance the influence of their evidence (Leslie et al. 2013; Lawton & Rudd 2014). Yet telling stories alone is rarely enough to influence policy; instead, these narratives must be policy relevant. To ensure that evidence is persuasive alongside other factors in a complex policy-making process, conservation scientists could follow 2 steps: reframe within salient political contexts and engage more productively in boundary work, which is defined as the ways in which scientists “construct, negotiate, and defend the boundary between science and policy” (Owens et al. 2006:640). These will both improve the chances of evidence-informed conservation policy. El Caso para la Ciencia de la Conservación con Relevancia Política Resumen A partir del debate “con base en evidencia” (Sutherland et al. 2013) versus “informado con evidencia” (Adams & Sandbrook 2013), debate que se ha vuelto prominente en la ciencia de la conservación, argumento que la ciencia puede ser influyente si mantiene una referencia dual (Lentsch & Weingart 2011) que contribuya a las necesidades de quienes hacen la política a la vez que mantiene un rigor técnico. En línea con dicha estrategia, los científicos de la conservación cada vez reconocen más la utilidad de construir narrativas con las cuales pueden mejorar la influencia de sus evidencias (Leslie et al. 2013; Lawton & Rudd 2014). Sin embargo, sólo contar historias rara vez es suficiente para influir sobre la política; en su lugar, estas

Ptychadena in Mauritania and the first record of Ptychadena schillukorum

PubMed Central

Sánchez-Vialas, Alberto; Calvo-Revuelta, Marta; Márquez, Rafael

2017-01-01

Abstract The study of specimens of the genus Ptychadena of the herpetological collection of the Museo Nacional de Ciencias Naturales de Madrid reveals the first record of Ptychadena schillukorum from Mauritania, extending the known distribution range of the species in West Africa more than 450 km northwards. A key is provided for the four Mauritanian species of Ptychadena to solve problems in identification encountered in previous studies. PMID:28769674

[The diffusion of knowledge].

PubMed

Ramiro-H, Manuel; Cruz-A, Enrique

2016-01-01

Between August 19 and 21, the Feria del Libro de las Ciencias de la Salud (Healthcare Book Fair) took place in the Palacio de Medicina in Mexico City. Archives of Medical Research, Revista Médica del IMSS, and Saber IMSS, three of the main instruments of knowledge diffusion of the Instituto Mexicano del Seguro Social, assisted to this book fair, which was organized by the Facultad de Medicina of UNAM.

Structural and Dynamical Aspects of Electrodeposition

DTIC Science & Technology

1993-05-01

Lfquido Utilizando Ondas Estacionarias de Rayos X " Investigaci6n y Ciencia (Scientific American in Spanish) (invited and submitted) 10. Bommarito, G. M...investigations researchers have emphasized the underpotential deposition of metal mono and multilayers employing electrochemical, x -ray based and ultra high...of adsorbate employed. 2. The underpotential deposition of copper on an iodine covered platinum surface by x -ray based techniques with emphasis on: a

Generalized Equations and Their Solutions. Part 2. Applications to Nonlinear Programming

DTIC Science & Technology

1980-03-01

7901066. Parts of the research for this paper were carried out at the Departement de Mathematiques elaD n Uversite Paris-IX Dauphine, with financial...support from the Centre National de la Recherche Scientifique, and at the Departamento de Matematicas y Ciencias de la Computaci6 n, Universidad Simon...Bolivar, Caracas, Venezuela, with support from the United Nations Educational, Scientific and Cultural Organization under Proyecto UNESCO VEN-77-002. The

International Symposium (43rd) on Molecular Spectroscopy Held in Ohio State University on 13-17 June 1988.

DTIC Science & Technology

1988-06-01

Superior de Investigaciones Cientificas, c/Serrano, 119, 28006 Madrid, Spain. TG7. ON THE ASSIGNMENT OF THE EXCITED SINGLET STATES IN THE CO. MOLECULE...Departmento de Quimica Fisica , Facultad de Ciencias, Universidad de Extremadura, Badajoz, Spain; and R. H. TIPPING, Department of Physics and Astronomy...Instituto de Estructura de la Materia, Consejo Superior de Investigaciones Cientificas, C/ Serrano, 119, 28006 Madrid, SPAIN. ’-. (2:𔃻) ON THE ASSIGNMENT

Formulation of Subgrid Variability and Boundary-Layer Cloud Cover in Large-Scale Models

DTIC Science & Technology

1999-02-28

related to burned and unburned landscapes, saline and non-saline soils, and irrigated and nonirrigated crops. Escuela de Agrono’mia Universidad de Talca...Piso 2 Departamento de Ciencias de la Atmosfera 1428 Capital Federal ARGENTINA Juan Carlos TORRES, torres@cima.uba.ar Coupled land-surface...evaporation fraction, and qc,sat is the canopy saturation specific humidity, a function of Tc. Using (21) - (22) we then de - termine qc qc = qca

The Gordon Conference on Inorganic Chemistry Held in Wolfboro, New Hampshire on 30 July-3 August 1990

DTIC Science & Technology

1991-06-01

Amgerst, MA 01002 Facultad De Ciencias Exactas Y Naturales Pabellon 1 - C Universitaria Dissado, Leonard N4 Buenos Aires 1428 Kings College Argentina...Laboratories 6 Universitatstrasse 2nd Floor B-2 Zurich Switzerland CH-8092 Rochester NY 14652-3208 Diebold, Michael P. Dunham, Stephen Dupont De Nemours...Laboratoire De Chimie Moleculaire Univ. of Paris-Sud URAAU CNRS Laboratoire De Chimie Theorique Univ. De Nice, Parc Vairose Batiment 490 Nice France 06034

An Invited Preface for the Following Book: Astrobiologia, Uma Ciencia Emergente

NASA Technical Reports Server (NTRS)

Rothschild, Lynn J.

2016-01-01

Since the dawn of civilization, we have beheld at the beauty and wonder of the natural world around us and wondered how it came to be. We have pondered the past, and have been intrigued about the future. For this we are unique. Our ancestors looked to the vastness of space and thought surely there are others out there. We are now at a new time in human history where we can address these age-old questions with a scientific approach and study rigorously the three big questions of astrobiology: Where do we come from? Where are we going? and Are we alone? These fundamental questions of astrobiology correspond to those of humanity, and arguably, what makes us human. And so we cannot help but be drawn to the field. Unlike other scientific disciplines, Astrobiology draws on the latest advances in a multitude of fields, from evolutionary and molecular biology, to prebiotic and interstellar chemistry, from astrophysics to astronomy, with a healthy dose of earth and planetary science. Astrobiology is in reality a "metadiscipline" drawing on useful science wherever it is to be found. From a practical point of view, this endeavor requires the interaction of scientists who might not normally meet each other, much less work on a common research project. And, unlike most other scientific disciplines, Astrobiology has implications for how we see ourselves, and how we interact with the earth and beyond. "Where do we come from" touches on the "why" questions that have intrigued not just scientists but philosophers and theologians. "Where are we going" adds to these an economic and political involvement that is currently being played out with discussions of climate change. "And are we alone" will someday force us to face the fact that we as living creatures are not unique, or perhaps that we are utterly alone in the universe, the result of a chemical history that was so improbable as to result in a sample size of one. Either result will force ethical considerations of either "the other" and their relationship to us, or our solitude and thus responsibility as the only life form in our cosmos. So what is Astrobiology? Let's start with the "Where do we come from?" A biologist will approach this looking at the evolution of life on earth, using such traditional tools as comparative anatomy and paleontology and newer tools such as molecular techniques. But this doesn't address why this happened the way it did without a comprehensive understanding of the environment. What was the temperature at such and such a time? Was the earth in a snowball phase or being bombarded by meteorites -- or even just a single large, well-placed one such as struck off the Yucatan peninsula 65 million years ago. This event could not have been predicted by population genetics alone, yet it had the most profound influence on our evolution as without it, we could still be in a world dominated by dinosaurs with the mammals cowering under cover. But it is not enough to go back to LUCA, the Last Universal Common Ancestor of all extant life. One must go back to the dawn of life. How did life arise? What was the environmental backdrop that allowed it to happen? How did we happen to end up with a habitable planet? Indeed, what is the origin and evolution of our solar system, galaxy, biogenic elements all the way back to the Big Bang. The "Where are we going?" tends to be ignored in many astrobiology programs, but in fact this is of the most immediate importance to us. Whereas the past was dominated by physical and chemical processes, and organismal interactions, the future has a new major player: us. While we probably don't have the power (yet) to stop our galaxy passing through another, or even reset the sun or stop the movement of the moon away from the earth, all of these things will influence the future of life on earth. We are already proving that we have the power to visit other bodies in our solar system, either with humans or our robotic surrogates. We are changing our atmospheric composition and thus our climate. We have the power to render species extinct, including our own. But we also have the power to use these tools for the common good, to extend our lifetimes and reclaim our rivers and forests. Which will it be? And then there is the question where science fiction becomes a reality: "Are we alone?" While many people are anxious to find signs of intelligent life out there, such a creature may not share either our curiosity or values. But what if there was a beneficent alien civilization that could communicate with us, perhaps forging a mutual understanding? More likely in the forseeable future is finding a small life, less evolved, life form. Note I did not use the word "simple" as there is nothing "simple" about life, ever. Which brings us back to the question: what is life? So where does Brazil come in? For nearly a decade there has been interest in a Brazilian astrobiology program, from a small side meeting held by the Brazilian Exobiology Program (BEP) of the Brazilian National Research Council, held in Rio de Janeiro, Brazil, on August 12, 2009, in association with the IAU Assembly to subsequent workshops held in several locations and membership of the Brazilian program in the NASA Astrobiology Institute (NAI). Each time I go to Brazil, I am impressed by the enthusiasm of the community, both scientific and student, the latter an excellent omen for the future of astrobiology in Brazil. Facilities are being built to supplement the natural laboratories that Brazil is blessed to have. In my own lab I have been privileged to have a wonderful Brazilian postdoctoral fellow, Dr. Ivan Paulino-Lima, resulting in a daily reminder of the program. I am honored to have been part of the development of astrobiology in Brazil, and hope that this relationship will continue to flourish. Clearly to advance astrobiology needs new knowledge, a reorganization of that which is known, and space missions. To help the reader join on this quest, what follows is a buffet of topics that will allow the reader to nibble on the richness that is Astrobiology. And, like a fabulous meal, it should make you want more. Welcome to Astrobiology.

Plasma-chemical simulation of negative corona near the inception voltage

NASA Astrophysics Data System (ADS)

Pontiga, Francisco; Duran-Olivencia, Francisco J.; Castellanos, Antonio

2013-09-01

The spatiotemporal development of Trichel pulses in oxygen between a spherical electrode and a grounded plane has been simulated using a fluid approximation that incorporates the plasma chemistry of the electrical discharge. Elementary plasma processes, such as ionization, electron attachment, electron detachment, recombination between ions and chemical reactions between neutral species, are all included in a chemical model consisting of 55 reactions between 8 different species (electrons, O2+,O2-,O3-,O-, O2, O, O3). Secondary emission at the cathode by the impact of positive ions and photons is also considered. The spatial distribution of species is computed in three dimensions (2D-axysimmetrical) by solving Poisson's equation for the electric field and the continuity equations for the species, with the inclusion of the chemical gain/loss rate due to the particle interaction. The results of the simulation reveal the interplay between the different negative ions during the development of every Trichel pulse, and the rate of production of atomic oxygen and ozone by the corona discharge. This work was supported by the Consejeria de Innovacion, Ciencia y Empresa (Junta de Andalucia) and by the Ministerio de Ciencia e Innovacion, Spain, within the European Regional Development Fund contracts FQM-4983 and FIS2011-25161.

En Busca de la Raza Cosmica: Tematica del Ensayo Iberoamericano (In Search of the Cosmic Race: Thematic of The Iberoamerican Attempt).

ERIC Educational Resources Information Center

Jaen, Didier T.

This essay examines the search for an ethnic identity as conducted by three South American writer-philosophers during three distinct historical periods. The author shows how the thinking of Sarmiento, Rodo, and Vasconcelos corresponds to each one's respective period of time and yet transcends the same to arrive at similar conclusions. Included is…

Astronomy in Science Textbooks: An Analysis of Pnld 2008. (Spanish Title: Astronomía en los Libros de Ciencia: un Análisis del Pnld 2008.) Astronomia Nos Livros Didáticos de Ciências: Uma Análise do Pnld 2008

NASA Astrophysics Data System (ADS)

Amaral, Patrícia; Quintanilha Vaz de Oliveira, Carlos Eduardo

2011-12-01

The importance of the textbooks in classrooms is revealed when studies are pointing that these pedagogical sources are, most of the times, the only source used by the elementary school teachers when preparing their Science lessons. When we analyzed the Astronomy contents in the textbooks approved by the Brazilian Textbook Program 2008 and which, in theory, are the best available in the Brazilian editorial market, we examined some categories in the 2008 Textbook Guide. This research characterizes the frequency of Astronomical contents appearing in the texts, in the pictures, and in the hands-on activities. Additionally, it describes some misconceptions and presents additional information on the collections. La importancia de los libros de texto en las aulas se pone de manifiesto cuando los estudios indican que este recurso educativo es a menudo la única fuente de consulta utilizada por el profesor de ciencias de la escuela primaria para preparar sus lecciones. Cuando analizamos el contenido presente en los libros de texto de astronomía aprobados por el Programa Nacional de Libros de Texto de 2008 y que, en teoría, son los mejores libros disponibles en el mercado editorial brasileño, buscamos examinar algunas categorías que figuran en los libros de texto de la Guía de Libros Didácticos de 2008. El estudio caracteriza la frecuencia del contenido de Astronomía en el texto, en las figuras, y en las actividades de experimentación. También describe algunos errores conceptuales y presenta un conjunto de información adicional sobre las colecciones. A importância dos livros didáticos nas salas de aula revela-se quando estudos apontam que este recurso pedagógico é, muitas vezes, a única fonte de consulta utilizada pelo professor de Ciências do ensino fundamental para a preparação de suas aulas. Quando analisamos os conteúdos de Astronomia presentes nos livros didáticos aprovados no Programa Nacional do Livro Didático de 2008 e que, teoricamente, são os

Zulma Ageitos de Castellanos: Publications and status of described taxa.

PubMed

Signorelli, Javier H; Urteaga, Diego; Teso, Valeria

2015-10-28

Zulma Ageitos de Castellanos was an Argentinian malacologist working in the "Facultad de Ciencias Naturales y Museo" at La Plata University where she taught invertebrate zoology between 1947 and 1990. Her scientific publications are listed in chronological order. Described genus-group and species-group taxa are listed. Information about the type locality and type material, and taxonomic remarks are also provided. Finally, type material of all described taxa was requested and, when located, illustrated.

Intrinsic measures of field entropy in cosmological particle creation

NASA Astrophysics Data System (ADS)

Hu, B. L.; Pavon, D.

1986-11-01

Using the properties of quantum parametric oscillators, two quantities are identified which increase monotonically in time in the process of parametric amplification. The use of these quantities as possible measures of entropy generation in vacuum cosmological particle creation is suggested. These quantities which are of complementary nature are both related to the number of particles spontaneously created. Permanent address: Departamento de Termologia, Facultad de Ciencias, Universidad Autonoma de Barcelona, Ballaterra, Barcelona, Spain.

Regional Seismology in Argentina

DTIC Science & Technology

1981-05-11

Ingenierfa y Cioncias Exactas, Fisicas y Naturales , San Juan. Volponi, F.S., 1974. La Sismicidad del Territorie Argentino en Rela- cidn con las Nuevas Ideas...and J., Rendiguren, 1963. El "Ruidem del Suelo (Ground *Noise*). Acts, Ciayana do Izigenieria, YU.’ No.6. Facial- tad de Ingenierfa y Ciencias ...Exactas, Fificas y Naturales , San Juan. lossl, 1.3., 1979. Retudie do le. Actividad Sfmuioa do Is. Provincia ?ucuusn (Study of Seismic Activity for

Assessing a Science Graduate School Recruitment Symposium.

PubMed

González-Espada, Wilson; Díaz-Muñoz, Greetchen; Feliú-Mójer, Mónica; Flores-Otero, Jacqueline; Fortis-Santiago, Yaihara; Guerrero-Medina, Giovanna; López-Casillas, Marcos; Colón-Ramos, Daniel A; Fernández-Repollet, Emma

2015-12-01

Ciencia Puerto Rico, a non-profit organization dedicated to promoting science, research and scientific education among Latinos, organized an educational symposium to provide college science majors the tools, opportunities and advice to pursue graduate degrees and succeed in the STEM disciplines. In this article we share our experiences and lessons learned, for others interested in developing large-scale events to recruit underrepresented minorities to STEM and in evaluating the effectiveness of these efforts.

A Population Genetics Study of Anopheles Darlingi (Diptera: Culicidae) from Colombia Based on Random Amplified Polymorphic DNA-Polymerase Chain Reaction and Amplified Fragment Length Polymorphism Markers

DTIC Science & Technology

2007-06-01

Biology of Disease Vectors, University Press of Colorado. Niwot, co. p. 417-437. Tadei WI’, Santos JMN, Rabbani MG 1982. Biologia de anofelinos amazonicos...wR 4𔃼.0 Mem Inst Oswaldo Cruz, Rio de Janeiro, Vol. 102(3): 255-262, June 2007 255 A population genetics study ofAnopheles darlingi (Diptera... de Ciencias y rdcullad de Salud. Universidad del Valle, (’.ali, Colombia *Depanment of Entomology, Walter Reed Army Institute of Research. Silver

OEA :: Misión de Apoyo contra la Corrupción y la Impunidad en Honduras :

Science.gov Websites

» | Tercer Informe Semestral » Plan de Trabajo 2017 » Inicia selección y certificación de fiscales y Departamento de Sustentabilidad Democrática y Misiones Especiales English Español Search OAS Corrupción Asamblea General Asesoría Legal Asuntos Internacionales B Becas C Ciencia y Tecnología

JPRS Report, Science & Technology, 16th International Congress of the International Society for Photogrammetry and Remote Sensing -- Volume 2

DTIC Science & Technology

1989-01-27

Rego Barbosa, Osvaldo Caldas; MCT - MINISTERIO DA CIENCIA E TECNOLOGIA , INPE - INSTITUTO DE PESQUISAS ESPACIAIS, Rod. Presidente Dutra, km 40 12630...economic crisis tne country J.- xa^+ y recoanition from the governmental planners of the priorities ana importance of INPE’s role...87 8, 216 430 8, 646 The situation changed and in the last three years a clear -cove^is being observed. Not only Jh«* •=>«* fche u-er tenden y

A Survey of Rollback-Recovery Protocols in Message-Passing Systems

DTIC Science & Technology

1999-06-01

and M.A. Castillo. "Checkpointing through garbage collection." Technical report. Departamento de Ciencia de la Computation, Escuela de Ingenieria ...between consecutive checkpoints. It can be implemented by using the dirty-bit of the memory protection hardware or by emulating a dirty-bit in software [4...compare the program’s state with the previous checkpoint in software , and writing the difference in a new checkpoint [46]. The required storage and

Assessing a Science Graduate School Recruitment Symposium

PubMed Central

González-Espada, Wilson; Díaz-Muñoz, Greetchen; Feliú-Mójer, Mónica; Flores-Otero, Jacqueline; Fortis-Santiago, Yaihara; Guerrero-Medina, Giovanna; López-Casillas, Marcos; Colón-Ramos, Daniel A.; Fernández-Repollet, Emma

2015-01-01

Ciencia Puerto Rico, a non-profit organization dedicated to promoting science, research and scientific education among Latinos, organized an educational symposium to provide college science majors the tools, opportunities and advice to pursue graduate degrees and succeed in the STEM disciplines. In this article we share our experiences and lessons learned, for others interested in developing large-scale events to recruit underrepresented minorities to STEM and in evaluating the effectiveness of these efforts. PMID:26770074

Miscible phase displacement, a survey. Part 3

DOE Office of Scientific and Technical Information (OSTI.GOV)

Stahl, C.D.

1965-03-01

J. G. Fitzgerald displaced a heavy hydrocarbon and water with a light hydrocarbon. C. Gatlin displaced oil and water with IPA slugs and a variety of combination alcohol slugs. S. H. Raza found that the alcohol process was more efficient at the lower rates of injection as compared to the higher rates. J. J. Taber, et al. displaced Soltrol and brine with isopropyl alcohol and tertiary butyl alcohol. R. L. Boyers, from his experimental data, deduced that molecular diffusion contributed very little toward the growth of the mixing zone. Not all the investigators are in agreement concerning the role ofmore » the injection rate in miscible displacement. Some of them have concluded that the displacement is sensitive to rate at high rates. Some have found that there is relationship between rate and recovery and that higher rates are more efficient. A literature review reveals that there is a definite rate sensitivity at all rates, especially at low rates of flow. From this information it is concluded that low rates are superior to high rates from the displacement efficiency viewpoint. (18 refs.)« less

Virtual Reality for Pain Management in Cardiac Surgery

PubMed Central

Mosso-Vázquez, José Luis; Gao, Kenneth; Wiederhold, Brenda K.

2014-01-01

Abstract Surgical anxiety creates psychological and physiological stress, causes complications in surgical procedures, and prolongs recovery. Relaxation of patients in postoperative intensive care units can moderate patient vital signs and reduce discomfort. This experiment explores the use of virtual reality (VR) cybertherapy to reduce postoperative distress in patients that have recently undergone cardiac surgery. Sixty-seven patients were monitored at IMSS La Raza National Medical Center within 24 hours of cardiac surgery. Patients navigated through a 30 minute VR simulation designed for pain management. Results were analyzed through comparison of pre- and postoperative vital signs and Likert scale survey data. A connection was found in several physiological factors with subjective responses from the Likert scale survey. Heavy positive correlation existed between breathing rate and Likert ratings, and a moderate correlation was found between mean arterial pressure and Likert ratings and heart rate and Likert ratings, all of which indicated lower pain and stress within patients. Further study of these factors resulted in the categorization of patients based upon their vital signs and subjective response, providing a context for the effectiveness of the therapy to specific groups of patients. PMID:24892200

Prevalence of antibodies against Treponema pallidum among HIV-positive patients in a tertiary care hospital in Mexico.

PubMed

Mata-Marín, José Antonio; Sandoval-Sánchez, Juan Joel; Huerta-García, Gloria; Arroyo-Anduiza, Carla Ileana; Alcalá-Martínez, Enrique; Mata-Marín, Luis Alberto; Sandoval-Ramirez, Jorge Luis; Gaytán-Martínez, Jesús

2015-02-01

Our objective was to determine the seroprevalence of syphilis among HIV-infected patients in a tertiary care hospital in Mexico City. A cross-sectional study was developed, and 318 HIV-positive patients were evaluated from January to February 2013 at Hospital de Infectología, National Medical Center 'La Raza' (a tertiary care hospital specialising in infectious diseases in Mexico City). Laboratory data were screened for the detection of antibodies against Treponema pallidum. Patients completed a questionnaire relating to socio-demographic data and factors associated with syphilis. Of the 318 patients, 83% were men. The mean age ± SD was 36 ± 11 years; 52% were men who have sex with men and 47% had undertaken higher education. The overall seroprevalence of syphilis among these patients was 25% (95% confidence interval 21%, 30%). Men who have sex with men had a significantly higher seroprevalence (30% vs. 15%, p = 0.009). We conclude that, in Mexico, there is a high seroprevalence of syphilis antibodies in HIV-infected patients and that men who have sex with men are the group most affected. © The Author(s) 2014 Reprints and permissions: sagepub.co.uk/journalsPermissions.nav.

[Leading causes of death during the induction therapy in pediatric patients with acute lymphoblastic leukemia].

PubMed

Aguilar-Hernández, Máximo; Fernández-Castillo, Gabriela; Núñez-Villegas, Nora Nancy; Pérez-Casillas, Ruy Xavier; Núñez-Enríquez, Juan Carlos

2017-01-01

Leukemias are the leading cause of childhood cancer. In most developed countries 1-2% of patients die during remission induction; however, in developing countries, this figure is higher and the causes of death apparently vary among the populations studied. The aim was to determine the cause of death during remission induction in pediatric patients with acute lymphoblastic leukemia (ALL) in the hospital "Dr. Gaudencio González Garza" of Centro Médico Nacional La Raza from January 1, 2009, to December 31, 2014. A retrospective cohort study was carried out and a descriptive statistical analysis was performed. During the study period, a total of 463 patients with ALL were diagnosed, out of which 5.4% died (n = 25). Among the patients who died, 64% (n = 16) were female and 60% had high-risk clinical features at diagnosis. The main causes of death were septic shock and bleeding. Early mortality was five times higher than the one reported for developed countries, while the causes of death did not differ. Close monitoring is necessary to detect and promptly treat complications secondary to chemotherapy toxicity in Mexican pediatric patients with ALL.

Revision curricular a partir de un analisis comparativo de las discrepancias en los curriculos de una escuela de optometria en Puerto Rico con las competencias requeridas para las agencias de revalida y acreditacion 2004

NASA Astrophysics Data System (ADS)

Rivera Pacheco, Andres

El proposito de esta investigacion, un estudio cualitativo de caso, fue comparar y contrastar el curriculo vigente de la Escuela de Optometria de la UIAPR con las competencias y estandares requeridos por las agencias de acreditacion y de revalida. Con este proposito, decidimos realizar una revision y un analisis de documentos: el prontuario de cada uno de los cursos de los curriculos implantados en el 1993 y en el 2001; las competencias y estandares establecidos por las agencias de revalida y de acreditacion; y las estadisticas en las que se analiza el porcentaje de estudiantes que aprueban cada una de las partes de los examenes de revalida entre el 1998 al 2003. Se realizaron entrevistas dirigidas para dar apoyo y complementar la revision y el analisis de estos documentos. Los participantes de las entrevistas fueron tres estudiantes de la clase de optometria del 2004 (ultima clase del curriculo del 1993); tres estudiantes de la clase de optometria del 2005 (primera clase graduanda del curriculo vigente) y tres profesores y/o directores de los Departamentos de Ciencias Basicas, Ciencias Clinicas y Cuidado al Paciente. Esta investigacion se enmarco en el modelo de evaluacion curricular de discrepancia de Malcolm Provus y en el modelo de desarrollo basado en competencias. Uno de los hallazgos mas importantes del estudio es que los cambios que se implantaron al curriculo del 2001 no han logrado que los estudiantes mejoren su ejecucion en los examenes de revalida. Por otro lado, se encontro que el curriculo vigente atiende completamente los estandares de la practica de Optometria, pero no las competencias. Esta informacion fue validada mediante el uso de una tabla de cotejo para el analisis de los cursos y de la informacion obtenida de las entrevistas. El estudio determina y concluye que existen discrepancias entre los prontuarios de los cursos del curriculo y las competencias requeridas por la agencia de revalida. Segundo, que el Departamento de Ciencias Basicas es el

A Numerical Study of the Plata River Plume Along the Southeastern South American Continental Shelf

DTIC Science & Technology

2005-01-01

Aires Depto. de Oceanografia, Servicio de Hidrografia Naval and Depto. CiEncias de la Atm6sfera y los Ocdanos, Buenos Aires, Argentina ABSTRACT The...descarrega no oceano Aguas de uma bacia de drenagem que cobre uma ampla Area da Amdrica do Sul. Sua pluma extende-se ao longo do norte da Argentina ...Instituto Nacional de Investigaci6n y Orlanski, I. 1976. A simple boundary condition for Desarrollo Pesquero, 109pp. unbounded hyperbolic flows. J

[The continuous intrusion of subjectivity in medical decisions].

PubMed

Lifshitz, Alberto

2016-01-01

La medicina contemporánea tiene su sustento más sólido en la ciencia positivista que pretende excluir la subjetividad y centrarse en el conocimiento sólido, objetivo, duro, demostrable, reproducible, verificable y falseable. Este enfoque ha generado beneficios indudables en tanto que en las decisiones se eluden muchas ideas que dominaron el pensamiento médico como la magia, el prejuicio, la casualidad, las fuerzas sobrenaturales, los dogmas y las creencias.

Proceedings of the International Workshop on Non-Crystalline Solids (3rd) Held in Matalascanas (Costa de la Luz), Spain on November 5-8, 1991. Trends in Non-Crystalline Solids,

DTIC Science & Technology

1992-01-01

line), and by Eq. 5 (broken line). 4. Acknowledgements Financial support has been provided by the "Plan Nacional de Nuevos Materiales " of the CICYT... Materiales , C. S. I. C. Universidad de Sevilla ’ World Scientific Singapore -New Jersey -London o Hong Kong Pubish. by World Scientific Publishing Co. Pte...V.E. Martin, J.M. Gonzd±lez Instituto de Ciencia de Materiales - CSIC. Serrano 144. 28006 Madrid, Spain and L. Schultz, K. Schnitzke Siemens AG

Intraosseous Erythropoietin for Acute Tissue Protection in Battlefield Casualties Suffering Hypovolemic Shock

DTIC Science & Technology

2013-11-01

Resuscitation. Universidad Católica de la Santísima Concepción, Facultad de Ciencias de la Salud . May 7-8. Concepción, Chile. 1997 Advances in CPR...Med 2003;31:2811-2812. 20. Gazmuri RJ. Editorial: Optimizando la calidad en medicina intensiva [Optimizing the quality of intensive care medicine...increase in left ventricular stroke work index and cardiac index – likely an effect on preload – that helped increase the aor- tic pressure and reduce the

Casimir energies and special dimensions in a toy model for branes

NASA Astrophysics Data System (ADS)

Cohen, Isaac

1988-12-01

We consider a generalization to branes of the old action for the strings without reparamentrization invariance. These actions admit natural supplementary mass-shell conditions. By regularizing the Casimir energies we calculate the special dimensions at which these toy branes show vector massless states in its spectrum. They all turn out to be non-integers. On sabbatical leave from Departamento de Física, Facultad de Ciencias, Universidad Central de Venezuela, Apartado Postal 66961, Caracas 1061A, Venezuela.

MICROMECHANICS AND MICROSTRUCTURE EVOLUTION: Modeling, Simulation and Experiments. Held in Madrid, Spain on 12-16 September 2005

DTIC Science & Technology

2006-10-30

acknowledges funding from the ‘‘ Programa Torres Quevedo’’ of the Spanish Ministerio de Educación y Ciencia. References [1] Nix WD. Metall Mater Trans A...University of Madrid E. T. S. de Ingenieros de Caminos Madrid 28040 Spain 8. PERFORMING ORGANIZATION REPORT NUMBER N/A 10. SPONSOR...Rodney * Génie Physique et Mécanique des Matériaux (UMR CNRS 5010), Institut National Polytechnique de Grenoble, 101 rue de la Physique, 38402

Micromechanics and Microstructure Evolution: Modeling, Simulation and Experiments. Conference Held in Madrid, Spain, 12-16 Sep 2005

DTIC Science & Technology

2006-10-30

acknowledges funding from the ‘‘ Programa Torres Quevedo’’ of the Spanish Ministerio de Educación y Ciencia. References [1] Nix WD. Metall Mater Trans A...University of Madrid E. T. S. de Ingenieros de Caminos Madrid 28040 Spain 8. PERFORMING ORGANIZATION REPORT NUMBER N/A 10. SPONSOR...Rodney * Génie Physique et Mécanique des Matériaux (UMR CNRS 5010), Institut National Polytechnique de Grenoble, 101 rue de la Physique, 38402

Development of Novel Data Processing Schemes and Global Seismic Event Database and Special Studies to Support the Explosions Monitoring Research Program

DTIC Science & Technology

2012-06-28

Centrales a Través de Residuos y Atenuación de Ondas Sísmicas,” Tesis de Grado, UMSA, Facultad de Ciencias Puras y Naturales, Departamento de ...velocity model we plan to develop in the future will be more revealing about near-source anisotropy. In addition, any picking errors are...shows the spectrum for an earthquake located at a distance of 216 km from the LPAZ MINE PROVINCIA Reference Viloco Loayza A 70 Km al SE de la

Tesoros de mi raza: Programa de lecture y ensenanza del lenguaje (Treasures of My Culture: Reading and Teaching Program for Language Instruction).

ERIC Educational Resources Information Center

Santos, Richard G.; And Others

This teacher's guide, reader and workbook are part of a series of bilingual instructional materials designed for the fourth, fifth, and sixth grades. The present materials are specifically for fourth graders. The goal of the series is to teach Spanish by means of stories that present historical and cultural facts and aspects of the daily life of a…

The Threat of Latin America Populism

DTIC Science & Technology

2010-04-07

Minister), August 14,2008, httpJ/www.cavallo.corn.ar/?p=173 , (accessed December 29, 2009). 38 1NV AP, " Tecnologia de Avanzada a Medida, Argentina.ar...December 5, 2008, http ://www.argentina.ar/ es/ciencia-y-educacion/C343 -invap- tecnologia -de-avanzada -a- medida.php (accessed December 15, 2009...ch_vez_obliga_a_)a_tv_por_cable_a_sumarse_a_)a_cade na nacion/ INV AP, " Tecnologia de Avanzada a Medida, Argentina.ar, December 5, 2008, http

Brazil’s Technology Sector

DTIC Science & Technology

2006-10-01

and Innovation in Brazil" (Rio de Janeiro: Agencia da Ciencia e Tecnologia , Ministerio da Cienca e Tecnologia , 2006) <agenciact.mct.gov.br/upd_blob...laboratories, and 27 Ministério da Ciência e Tecnologia , “Relatório Nanotecnologia Investimentos, Resultados e Demandas” (Brasília: 2006), 12. <http...www.mct.gov.br/upd_blob/8075.pdf> (accessed on October 20, 2006). 28 Ministério da Ciência e Tecnologia , “Relatório Nanotecnologia Investimentos

The Aula Espazio Gela Observatory: A tool for Solar System Education and Outreach

NASA Astrophysics Data System (ADS)

Rojas, J. F.; Perez-Hoyos, S.; Hueso, R.; Mendikoa, I.; Sanchez-Lavega, A.

2011-10-01

We present a summary of the activities undertaken over the first year of operations of the "Aula Espazio Gela Observatory", with teaching and astronomy outreach purposes. The observatory belongs to the Universidad del País Vasco and is a fundamental part of the "Master en Ciencia y Tecnología Espacial" (Space Science and Technology master). It is an urban observatory with the dome located on the roof of the School of Engineering at the Universidad del Pais Vasco in Bilbao (Spain).

Area Handbook Series: Venezuela; A Country Study

DTIC Science & Technology

1990-12-01

crept down to B43 - US$1. In a related matter, the Currency Exchange Office (R6gimen de Cambio de Dinero-Recadi), the organization that oversaw the...Febres, Carlos Eduardo. "Religi6n y Comportamiento Politico de la Clase Obrera en Caracas," Revista de la Facultad de Ciencias Jurzdicasy Politicas...Mendoza, 1962. Villamrnzar, Thania. " Proceso de represi6n alas prncticas migico- religiosas en M6rida," Boletin Antropolgico [M~rida, Venezue- la), No. 11

A Generalized Approach to Equational Unification.

DTIC Science & Technology

1985-08-01

Interpreter Working with Infinite Terms," Technical Report FCT/UNL - 20/82, Faculdade de Ciencias e Tecnologia , November 1982. Quinta da Torre, 2825...x. y , z. For readability, we will use the symbols, + *, and * as binary infix operators. Examples of terms are f(x, a), / (x - 0), and y + 1. Given a...z 2. x . y = y ex. The integer operations of plus and times are only two of the many examples of associative and commutative functions about which we

Silicon Nanoclusters Embedded in SiO2 Studies by Raman Scattering

DTIC Science & Technology

2001-06-01

was partially supported by a CON- CYTEQ (Consejo de Ciencia y Tecnologia del Estado de Quer~taro) and CONACyT from Mexico. References [1] L. Rebohle, J...scattering F J. Espinoza-Beltrdnt, L. L. Diaz-FloresT, J. Morales-Herndndezl, J. M. Ydfiez-Lim6nt, F Rodriguez-Melgarejot, Y . V. VorobievT and J. Gonzflez...F. PNrez-Robles, R. Ramirez- Bon, Y . V. Vorobiev and J. Gonzdilez-Hern~indez, Microelectronic Engineering, 51-52, 659- 666 (2000). [6] K. Kim, Phys

Low temperature Grüneisen parameter of cubic ionic crystals

NASA Astrophysics Data System (ADS)

Batana, Alicia; Monard, María C.; Rosario Soriano, María

1987-02-01

Title of program: CAROLINA Catalogue number: AATG Program obtainable from: CPC Program Library, Queen's University of Belfast, N. Ireland (see application form in this issue) Computer: IBM/370, Model 158; Installation: Centro de Tecnología y Ciencia de Sistemas, Universidad de Buenos Aires Operating system: VM/370 Programming language used: FORTRAN High speed storage required: 3 kwords No. of bits in a word: 32 Peripherals used: disk IBM 3340/70 MB No. of lines in combined program and test deck: 447

Measure Fields for Function Approximation

DTIC Science & Technology

1993-06-01

intelligence research is provided by ONR contract N00014-91-J-4038 J.L. Marroquin was supported in part by a grant from the Consejo Nacional de Ciencia y ... Tecnologia , Mexico. _ 93-28011 9-3 -- -" nnuM IInu 4 0 0 0 1 Introduction imating functions are always discontinuous, and the dis- continuities are...capacity and generalization capabili- is present panel (a) of figure 1 shows a function z(z, y ) ties. that is equal to a tilted plane inside an L

Melanocortin and Opioid Peptide Interactions in the Modulation of Binge Alcohol Drinking

DTIC Science & Technology

2012-04-01

ability of naltrexone to blunt binge-like ethanol drinking in mice. Thus, the inclusion of MCR agonists may improve the effectiveness of naltrexone...Hill, Chapel Hill, North Carolina; Department of Neurociencia y Ciencias de la Salud (JML-C, FC, IC), University of Almerı́a, Almerı́a, Spain...09-1-0293, and MEC grants (Spain) SEJ2006-03629, ‘‘ Programa Salvador Madariaga 2006’’ and J.A., grant CTS1350. REFERENCES Adan RA, Gispen WH (1997

Microstructure and Thermal Expansion Properties of Ostrich Eggshell

DTIC Science & Technology

2002-04-01

A.Rodriguez-Hernindez, E. Villarreal4, A. Martinez, M.V. Garcia-GardufiolŖ, V.A. Basiuk 3ř, L. Bucio and E. Orozco Instituto de Fisica UNAM, Apdo. Postal 20...Ku, Yokohama 240-8501.41nstituto de Investigaciones en Materiales, UNAM, 04510 Mexico D.F. Mexico ABSTRACT Textures of calcite crystals from ostrich...364, 01000 Mexico D.F., Mexico ’Facultad de Ciencias UNAM, 04510 Mexico D.F. Mexico 2 Div. de Posgr. e Invest., Facultad de Odontologia UNAM, 04510

Que es la Ciencia? What Is Science? A Question for All Students.

ERIC Educational Resources Information Center

Spurlin, Quincy; Blanco, George

This teacher's guide offers classroom techniques for teaching science to bilingual elementary students. Recommendations are made for improving teaching by: lowering students' affective filters; providing comprehensible input; providing for language output; creating a supportive environment; adjusting classroom teaching style; teaching…

The Language of "Ciencia": Translanguaging and Learning in a Bilingual Science Classroom

ERIC Educational Resources Information Center

Poza, Luis E.

2018-01-01

Much attention is now given to academic language, particularly in content areas such as science, amid persistent achievement disparities between students classified as English Language Learners, and more recently, Long Term English Learners, and their English-proficient peers. This attention has fueled debate about the precise features of such…

Libros, de Ciencias en Espanol (A Selection of Trade Books in Spanish).

ERIC Educational Resources Information Center

Schon, Isabel

2002-01-01

Lists a selection of trade books written in Spanish for young readers. Books are categorized under the headings For the Very Young, Biology, Ecology, General Science, Physical Science, and Technology. (YDS)

International Neural Network Society Annual Meeting (1994) Held in San Diego, California on 5-9 June 1994. Volume 4

DTIC Science & Technology

1994-06-09

Tuberculosis + Fever - Tuberculosis 1289W M4460 E201Ol F93983 001886 The date coding takes the internal structure of data codification into account...N 1(X+ 1,y1,Z1,N I tN l ) 2Funm dtNi - --tet+ NW N -- aN1 ONN r IV- 126 time.~ ~ ~ ~ Beas 2>p yasmto ,teei oitrcino antcfed ewe , adN ae And the...Cibernetica *Laboratorio de Biofisica Departamento de Fisica, Facultad de Ciencias, Mixico National University (UNAM), Ciudad Universitaria, Mexico , D.F

ASTRONET: Towards a Strategic Plan for European Astronomy

NASA Astrophysics Data System (ADS)

Gallego, J.; Torra, J.; Barcons, X.; Mas-Hesse, M.

ASTRONET is an ERA-Net financed by the European Commission FP6 under the initiative Integrating and Strengthening the European Research Area (ERA). ASTRONET was created by a group of European funding agencies in order to establish a comprehensive long-term planning for the development of European astronomy. The objective of this effort is to consolidate and reinforce the world-leading position that European astronomy has attained at the beginning of this twenty-first century. The Ministerio de Ciencia e Innovación is the Spanish representative.

Diffusion of torqued active particles

NASA Astrophysics Data System (ADS)

Sandoval, Mario; Lauga, Eric

2012-11-01

Motivated by swimming microorganisms whose trajectories are affected by the presence of an external torque, we calculate the diffusivity of an active particle subject to an external torque and in a fluctuating environment. The analytical results are compared with Brownian dynamics simulations showing excellent agreement between theory and numerical experiments. This work was funded in part by the Consejo Nacional de Ciencia y Tecnologia of Mexico (Conacyt postdoctoral fellowship to M. S.) and the US National Science Foundation (Grant CBET-0746285 to E.L.).

Characterising the Venezuelan Troposphere for Radio-Astronomy Studies

NASA Astrophysics Data System (ADS)

Pacheco, R.; Muñoz, A. G.; Brito, A.; Cubillán, N.

2009-05-01

Venezuela possesses a very useful geographical location for doing Radioastronomy. Recently, the Venezuelan Government (via FIDETEL-Ministerio de Ciencia y Tecnología) has aproved to the Laboratorio de Astronomía y Física Teórica (LAFT) of La Universidad del Zulia (Venezuela) the adquisition of four 3 meter diameter parabolic dishes that will be set as a radio-interferometer receiver and that can be used for certain Radioastronomy purposes. The specifications of the instrument will be treated elsewhere (Muñoz and Hernández 2007). To this aim, as ussually, the first step is to characterize the losses due to the atmosphere, and their evolution over time. In previous works (Muñoz et al. 2004, Memoires of V RIAO/VIII OPTILAS, M10-5 Modelling Tropospheric Radio-Attenuation Parameters for Venezuela, 359; Muñoz et al. 2006, CIENCIA, Vol. 14, 4, 428) we have studied some relevant electromagnetic (e-m) attenuation parameters dueto hydrometeors and absortion gases in the lower atmosphere, focused in local telecommunication applications (surface e-m trajectories). In this work we extend our results to include the cenital and quasi-cenital e-m trajectories, characterizing thus the medium losses in the 0.4-4.0 GHz spectral window for several Venezuelan locations. We report refractivity values and their gradients, tropospheric indexes, extinction coefficients and the total rain attenuation for the whole territory under study.

[Blood and urine lead levels in children with attention deficit hyperactivity disorder].

PubMed

Sánchez-Villegas, M del Carmen S; Cortés-Vargas, Astrid; Hidalgo-Luna, Ricardo Gerardo; Alam-Escamilla, David Abraham; Vargas-García, Víctor Manuel; Loría-Castellanos, Jorge

2014-01-01

Attention deficit hyperactivity disorder is the most common neuropsychiatric disorder in children; symptoms can persist into adult life by 60 %. Our objective was to quantify the levels of lead in blood and urine in pediatric patients with attention deficit hyperactivity disorder. We did an observational study which included a captive population of children diagnosed with attention deficit hyperactivity disorder in the mental health service of Hospital General, from Centro Médico Nacional La Raza. Lead levels were determined in blood and urine by atomic absorption technique. We included 39 patients, 932 % male, with a mean age of 9.2 ± 2.16 years. The deficit and hyperactivity disorder combined type was the most frequent (69.2 %); 49 % of patients were found with toxic lead levels in blood (above 10 mg/dL); 17.9 % with stage III and 5.12 % with stage IV, according to the Mexican Official Standard (NOM-199-SSA-2000). Significant association was found between blood lead levels and the clinical expression of attention deficit hyperactivity disorder. Levels of lead exposure during early childhood have been shown to be inversely proportional to neurological development in the first seven years of life. Data results are insufficient to relate them with causality.

Letters to the Editor

NASA Astrophysics Data System (ADS)

1998-03-01

All the Letters to the Editor in this issue are in the same PostScript or PDF file. Contents Comment on `Magnetic and electric field strengths of high voltage power lines and household appliances' José Luis Giordano Dept. de Ciencia y Tecnología de Materiales y Fluidos, CPSI, Universidad de Zaragoza, Spain Twins paradox S R Carson Norton College, Malton, North Yorkshire, UK On alternative ways of finding the ratio of specific heats of gases Tomas Ficker Physics Department, Technical University of Brno, Czech Republic

Ferromagnetic Long Range Ordering in Copper(2) Maleate Monohydrate.

DTIC Science & Technology

1988-11-20

thanks the Consejo Nacional de Ciencia y Tecnologia for a partial fellowship. 10 References 1a) SYNTHECO, Inc., 1920 Industrial Pike, Gastonia, N.C...Philadelphia, 1966; Chapter 3. 14) D. B. Losee and W. E. Hatfield, Phs e.i Q 1122 (1974). 15) y . Yamamoto, M. Matsuura, and T. Haseda, J. Phys.-Soc...Mal in the solid state recorded at room temperature. 12 (0 Vj) N 4W +C +~ 13 4P4 CYC CS) (SG) CS + 0 (0 + C, S+ + 06 + + + 3 CC, (( Y ) uo p1 3ubA 00 CL

Applications of computer assisted surgery and medical robotics at the ISSSTE, México: preliminary results.

PubMed

Mosso, José Luis; Pohl, Mauricio; Jimenez, Juan Ramon; Valdes, Raquel; Yañez, Oscar; Medina, Veronica; Arambula, Fernando; Padilla, Miguel Angel; Marquez, Jorge; Gastelum, Alfonso; Mosso, Alejo; Frausto, Juan

2007-01-01

We present the first results of four projects of a second phase of a Mexican Project Computer Assisted Surgery and Medical Robotics, supported by the Mexican Science and Technology National Council (Consejo Nacional de Ciencia y Tecnología) under grant SALUD-2002-C01-8181. The projects are being developed by three universities (UNAM, UAM, ITESM) and the goal of this project is to integrate a laboratory in a Hospital of the ISSSTE to give service to surgeons or clinicians of Endoscopic surgeons, urologist, gastrointestinal endoscopist and neurosurgeons.

Historia de vidas de profesoras de ciencias: Hacia una ensenanza cientifica de calidad

NASA Astrophysics Data System (ADS)

Vega Osorio, Melba

The purpose of this research was to capture the memories, practices, thoughts and philosophies of education that four experienced Science teachers have accumulated through the years. The life story qualitative research design was used in order to collect more meaningful information from the participants amenable to in depth analysis and interpretation. The life stories interviews were conducted using an interview protocol especially designed for the study. The interviews were recorded and transcribed. The questions that guided this research are: 1. What are the meanings that science teachers give to their educational practices? 2. How did the life experiences of the participants contribute to their success as science teachers? 3. How did the participants' educational practices change and evolve over time? 4. What does teaching science mean in the life of the participants? 5. Which reflections arise from the work of the participants that impact the teaching of science? 6. What are the participants' conceptions about teachers' professional development? 7. What are the participants' contributions to the field of scientific education? Wolcott's (1994) DAI analytical model was used for the analysis of the information and the narratives were written following the three dimensions of the model: description, analysis and interpretation. According to the life stories of the participants, being a teacher requires more than teaching the content. To be a successful and an exemplary science teacher, they have to live the teaching vocation, with dedication, passion, commitment and love for teaching, for students and science; teachers have to give their best for the students, even if it means making personal sacrifices; they should keep updated in knowledge (content) and in educational innovations (strategies); emphasizing both the theoretical and the practical aspects in the field of science, and being an inspirational guide for students.

Como Ayudar a sus Hijos a Aprender Ciencia (Helping Your Child Learn Science).

ERIC Educational Resources Information Center

Paulu, Nancy; Martin, Margery

Because most parents say they do not or cannot help their children with science, this booklet was designed to help them do so, easily and with pleasure for both parent and child. The introduction presents information on why and how parents should help their children and provides a general orientation to the ideas and activities offered in the…

Prueba de Ciencia Primer Grado (Science Test for the First Grade). [In Spanish

ERIC Educational Resources Information Center

Puerto Rico State Dept. of Education, Hato Rey.

This document consists of three parts: (1) a manual for administering the science test to first graders (in Spanish), (2) a copy of the test itself (pictorial), and (3) a list of expected competencies in science for the first three grades (in English). The test consists of 25, four-choice items. For each item, the administrator reads a statement…

Ciencia en "Nepantla": The Journey of "Nepantler@s" in Science Learning and Teaching

ERIC Educational Resources Information Center

Aguilar-Valdez, Jean R.; LópezLeiva, Carlos A.; Roberts-Harris, Deborah; Torres-Velásquez, Diane; Lobo, Gilberto; Westby, Carol

2013-01-01

This paper presents a new approach to science education that takes a path through sociocultural theory and into the ideas of Gloria Anzaldúa. We apply Anzaldúan theory to science education by illustrating it in action through various examples which explore the multidimensionality of teaching science with Latin@ students in various contexts…

Nuevas Tendencias en la Ensenanza de las Ciencias (New Trends in Science Education).

ERIC Educational Resources Information Center

Oficina Regional de Educacion de la Unesco para America Latina y el Caribe, Santiago (Chile).

The concern for improving science education in Latin America is reflected in this document compiled by UNESCO offices in Chile, Uruguay, and Paris with financial support from UNICEF, and directed to Latin American science teachers. The first part deals with planning the reforms needed in science education and the practical considerations involved.…

Ciencia en Nepantla: the journey of Nepantler@s in science learning and teaching

NASA Astrophysics Data System (ADS)

Aguilar-Valdez, Jean R.; LópezLeiva, Carlos A.; Roberts-Harris, Deborah; Torres-Velásquez, Diane; Lobo, Gilberto; Westby, Carol

2013-12-01

This paper presents a new approach to science education that takes a path through sociocultural theory and into the ideas of Gloria Anzaldúa. We apply Anzaldúan theory to science education by illustrating it in action through various examples which explore the multidimensionality of teaching science with Latin@ students in various contexts including dual language settings. We present what it is to journey through transformation using examples from educators at various levels of science within the world of teaching science with Latin@ students in the U.S. Our examples illustrate how Latin@ students cross many cultural borders in Spanish, English, Latin@ home culture, school culture, and the world of scientific dialogue and content, and in doing so, go through tensions and transformations between dominant and non-dominant worlds, which should be acknowledged and better understood through Anzaldúan theory. Fundamentally, we present a transformative notion of Latin@ science learning as "living on the bridges" of many dialogic and cultural practices, and having to negotiate these in-between spaces, or " nepantla" (Anzaldúa and Keating in Interviews, Psychology Press, London, 2000), where Latin@ students must contend with the fragmented and sometimes painful struggle of living in racialized reality amidst the demands of a dominant culture, and where transformation and healing are possible through the path of conocimiento. We advocate for teachers to become science teacher nepantler@s, who guide their students through nepantla, and into a new mestiz@ consciousness of science education.

[Variations in a 24-year period of colorectal and gastric cancer in Mexico].

PubMed

González Trujillo, José Luis; Vargas, Florencia; Torres Villalobos, Gonzalo; Milke, Pilar; Villalobos Pérez, José de Jesús

2003-01-01

Gastric cancer (CG) and colorectal cancer (CCR) are the two most common neoplasms of the digestive system in the world. We performed a study to determine incidence and relation between CG and CCR in five hospitals in Mexico City. Patients with admitted diagnosis of CG and CCR at Hospital General de Mexico, Instituto Nacional de Ciencias Médicas y Nutrición Salvador Zubirán, Hospital Español de México, Centro Médico Nacional "20 de Noviembre" from the Instituto de Salud y Seguridad Social para Trabajadores del Estado, and Hospital Central Militar from January 1978 to December 2001 were studied. A total of 7,136 patients were studied. (CG 3,830, CCR 3,306). At Instituto Nacional de Ciencias Médicas y Nutrición "Salvador Zubirán" CG was the most common digestive neoplasm; from 1999, ratio was inverted to < 1. At Hospital General de México, from the beginning and until 1984, ratio was > 2, and later had an average of 1.31. For Hospital Español, ratio always was < 1 without changes. At Centro Médico Nacional "20 de Noviembre", initially CCR was more frequent, then CG, and finally CCR. At Hospital Central Militar ratio was constant, > CG. At the beginning, was global behavior > CG, ratio seemed to invert, but since 1998 CG/CCR ratio was < 1 and continued that way. In this study, we found that changes of CG/CCR ratio in a period of 24 years showed elevation of CCR incidence at five Mexican hospitals.

The Science Teachers and Their way of Thinking about Astronomy. (Spanish Title: Los Profesores de Ciencias y Sus Formas de Pensar la Astronomía.) Os Professores de Ciências e Suas Formas de Pensar a Astronomia

NASA Astrophysics Data System (ADS)

Leite, Cristina; Hosoume, Yassuko

2007-12-01

The research presented in this article is about the way science teachers from Elementary School think about astronomical elements. Its methodology is based on semi-structured interviews, which were video recorded. The research is centered in a three-dimensional perspective of astronomical Earth, the Sun, the Moon, the planets and the stars, and also the conceptions about sky and Universe. The esults indicate a Universe that contains: Sun, stars, planets and Moon; where the Solar System is a little part of the whole. Sometimes they think that the Solar System is the Universe. The objects are in the sky or in the Universe, which, for many of them, is only the space above the Earth. The flat shape of astronomical objects and the spatial structure of the Universe are striking features. Many of them think that Sun and stars are different: the Sun is a hot object and the stars are cold ones. These results worry us and they certainly indicate how urgent it is to plan Professional Development in Astronomy for teachers, after all the PCN's emphasize that this subject is important to be taught. El objeto de investigación de este artículo es la manera de pensar sobre los elementos de la Astronomía de los profesores de Ciencias en la enseñanza fundamental. La metodología consiste en entrevistas semi-estructuradas, filmadas en video y centradas en la tridimensionalidad de los elementos astronómicos, para posibilitar un mapeamiento de las concepciones sobre las formas y dimensiones de la Tierra, del Sol, de la Luna, de los planetas y de las estrellas, como también de la concepción de cielo y de Universo en su totalidad. Los resultados indican un Universo conteniendo: Sol, estrellas, planetas y Luna, donde el Sistema Solar se ubica como parte. Algunas veces, el Universo es concebido como el propio Sistema Solar. Los objetos están en el cielo o en el Universo, que, para muchos, se restringe al espacio que está arriba de la Tierra. La forma plana de los objetos astron

Los manuales de quimica en Espana (1788--1845): Protagonistas, terminologia, clasificaciones y orden pedagogico

NASA Astrophysics Data System (ADS)

Munoz Bello, Maria Rosa

La presente tesis doctoral es una investigacion sobre los manuales de quimica utilizados en Espana de 1788 a 1845. Este trabajo proporciona una perspectiva general de un tema relevante en las ultimas decadas en Historia de la Ciencia, el estudio de los libros de texto. De acuerdo con las ultimas investigaciones realizadas en este terreno, el acto pedagogico es considerado como un proceso creativo, como espacio de encuentro de actores e intereses muy diversos, matizando las ideas defendidas por Thomas S. Kuhn. Recordemos que segun Kuhn, los libros de texto ofrecen una vision consensuada y normalizada del estado de la ciencia de su epoca, por lo que sus autores eliminan deliberadamente toda controversia y presentan asi una imagen distorsionada de la actividad cientifica. En cambio, se ha mostrado, por ejemplo, que en la ensenanza participan no solamente profesores y alumnos sino tambien otros muchos actores y todos ellos no unicamente con intereses puramente pedagogicos sino tambien con diversos intereses politicos y economicos que pueden conocerse a traves del estudio de los manuales. En esta tesis se pretende analizar los manuales de quimica en Espana desde 1788 hasta 1845. Para poder llevar a cabo la investigacion ha sido necesario precisar el objeto de estudio (libro de texto de quimica) durante el periodo estudiado (1788-1845) ya que no es adecuado adoptar la imagen actual de una disciplina que sufrio sustanciales cambios durante la epoca estudiada. Esta investigacion se centra en un momento especialmente importante para la quimica y que algunos historiadores han llegado a considerar "revolucionario". Durante estos anos se produjo un cambio importante en las teorias quimicas sobre la combustion y el concepto de elemento, asi como una reforma terminologica que originaron la aparicion de importantes controversias. Ademas, debido a la relacion de la quimica con otras disciplinas como la historia natural o la fisica ha sido necesario restringir el objeto de estudio

Association between ovine protein polymorphisms and geographical variables in Europe and south-west Asia.

PubMed

Ordas, J G; Carriedo, J A

1997-01-12

The spatial distribution of six blood-protein polymorphisms in European and south-west Asian ovine breeds was analysed. Latitudinal clines were found for haemoglobin and transferrin loci. The respective F(ST) values are not significantly greater than those for protein-X, esterase, carbonic anhydrase, and albumin, where gene frequencies are not associated with latitude. The results suggest that historical processes of gene flow, rather than adaptation to different environments, have played a major role in determining the observed lives of gene frequencies. RESUMEN: Asociación entre polimorfismos proteicos ovinos y variables geográficas en Europa y sudoeste de Asia Se ha analizado la distribución espacial de seis polimorfismos proteicos sanguíneos en razas ovinas de Europa y del sudoeste de Asia. La hemoglobina y la transferrina muestran clinas latitudinales. Los valores de F(ST) para estos dos loci no son significativamente más grandes que los de la proteína-X, esterasa, anhidrasa carbónica y albúmina, cuyas frecuencias génicas no están asociadas con la latitud. Los resultados sugieren que la distribución de las frecuencias génicas de la hemoglobina y la transferrina se debe a procesos históricos de flujo génico y deriva genética. 1997 Blackwell Verlag GmbH.

[Participatory education and the development of critical reading in teachers theoretical texts. Multicenter study].

PubMed

Leyva-González, Félix Arturo; Leo-Amador, Guillermo Enrique; Viniegra-Velázquez, Leonardo; Degollado-Bardales, Lilia; Zavala-Arenas, Jesús Arturo; González-Cobos, Roberto Palemón; Valencia-Sánchez, Jesús Salvador; Leyva-Salas, César Arturo; Angulo-Bernal, Sonia Elizabeth; Gómez-Arteaga, Gress Marissell

2010-01-01

Determine what the relationship between participation in classroom of students attending courses at the Educational Research and Teacher Education (CIEFD's) and the development of proficiency in critical reading of theoretical texts in education. Intervention study, multicenter students (medical specialist) level Diploma in teaching methodology (DMDN) 1 and 2 (n=46 n=29) of the six CIEFD's (DF Siglo XXI, Mexico City La Raza, Nuevo Leon, Sonora, Puebla and Veracruz), period: March to August 2007 and a Masters in education (n=9, generation 2007-2008). Two instruments were constructed that evaluated the participation variables and critical reading of theoretical texts in education, conceptual validity; content and reliability were assessed by experts in education research. The educational intervention was in the form of seminars (three times a week in DMDN 1 and twice weekly in DMDN 2 and Masters). Participation was assessed halfway through the course and on completion, critical reading at the beginning as well as the end. Statistically significant associations were observed in DMDN 1 (four Centers) and the Masters, but not DMDN 2. In this investigation some of the theoretical proposals of the participatory education were recreated, starting from the analysis of our results. In some centers and in the masters, strengthening participation in this educational intervention is related to the development of critical reading of theoretical texts in education.

Monitoreo del Aire en Puerto Rico a través de la Ciencia Ciudadana

EPA Pesticide Factsheets

Comunidad de Tallaboa/Encarnación en Peñuelas, Puerto Rico es un ejemplo de una comunidad comprometida con mejorar la calidad de aire para sus residentes que han sufrido el impacto acumulativo de la contaminacion en su localidad.

Libros de Ciencias en Espanol: A Selection of Recent Science Trade Books in Spanish.

ERIC Educational Resources Information Center

Schon, Isabel

2001-01-01

Introduces a list of trade books written in Spanish that can be used for science education. Categorizes the list under five headings for the very young, biology, general science, physical science, and technology. (YDS)

"Libros de Ciencias en Espanol": A Selection of Recent Science Trade Books in Spanish

ERIC Educational Resources Information Center

Schon, Isabel

2009-01-01

Simple, lively, and easy-to-understand science books in Spanish for the very young are the new reality in the publishing world. In contrast to previous years where there has been a wider selection of books for beginning, middle, and advanced readers, today publishers in the United States (with a few exceptions) seem to be concentrating on books…

Libros de Ciencias en Espanol (A Selection of Recent Science Trade Books in Spanish)

ERIC Educational Resources Information Center

Schon, Isabel

2005-01-01

Teachers who have Spanish-speaking students in their science class, will likely be interested in learning about the recent releases of Spanish trade books for children. From appealing paperback series about colors, opposites, shapes, and numbers to smooth Spanish renditions of Isaac Asimov's engaging overview of the universe, these books are just…

Ambient seismic noise levels: A survey of the permanent and temporary seismographic networks in Morocco, North Africa

NASA Astrophysics Data System (ADS)

El Fellah, Y.; Khairy Abd Ed-Aal, A.; El Moudnib, L.; Mimoun, H.; Villasenor, A.; Gallart, J.; Thomas, C.; Elouai, D.; Mimoun, C.; Himmi, M.

2013-12-01

Abstract The results, of a conducted study carried out to analyze variations in ambient seismic noise levels at sites of the installed broadband stations in Morocco, North Africa, are obtained. The permanent and the temporary seismic stations installed in Morocco of the Scientific Institute ( IS, Rabat, Morocco), institute de Ciencias de la Tierra Jaume almera (ICTJA, Barcelona, Spain) and Institut für Geophysik (Munster, Germany) were used in this study. In this work, we used 23 broadband seismic stations installed in different structural domains covering all Morocco from south to north. The main purposes of the current study are: 1) to present a catalog of seismic background noise spectra for Morocco obtained from recently installed broadband stations, 2) to assess the effects of experimental temporary seismic vault construction, 3) to determine the time needed for noise at sites to stabilize, 4) to establish characteristics and origin of seismic noise at those sites. We calculated power spectral densities of background noise for each component of each broadband seismometer deployed in the different investigated sites and then compared them with the high-noise model and low-noise Model of Peterson (1993). All segments from day and night local time windows were included in the calculation without parsing out earthquakes. The obtained results of the current study could be used forthcoming to evaluate permanent station quality. Moreover, this study could be considered as a first step to develop new seismic noise models in North Africa not included in Peterson (1993). Keywords Background noise; Power spectral density; Model of Peterson; Scientific Institute; Institute de Ciencias de la Tierra Jaume almera; Institut für Geophysik

Evolution of Electron Transport Chains During the Anaerobic to Aerobic Transition on Early Earth

NASA Astrophysics Data System (ADS)

Sepúlveda, R.; Ortiz, R.; Holmes, D. S.

2015-12-01

Sepulveda, R., Ortiz R. and Holmes DS. Center for Bioinformatics and Genome Biology, Fundacion Ciencia y Vida, and Facultad de Ciencias Biologicas, Universidad Andres Bello, Santiago, Chile.According to several models, life emerged on earth in an anoxic environment where oxygen was not available as a terminal electron acceptor for energy generating reactions. After the Great Oxidation Event (GOE) about 2.4 billion years ago, or perhaps even before the GOE, oxygen became the most widespread and efficient terminal electron acceptor and was accompanied by the evolution of a number of redox proteins that could deliver electrons to reduce oxygen to water. Where did these proteins come from? One hypothesis is that they evolved by the neofunctionalization of previously existing redox proteins that had been used in anaerobic conditions as terminal electron donors to reduce compounds such as perchlorate, nitric oxide or iron. We have used a number of bioinformatic tools to explore a large number of genomes looking for discernable signals of such redeployment of function. A Perl pipeline was designed to detect sequence similarity, conserved gene context, remote homology detection, identification of domains and functional evolution of electron carrier proteins from extreme acidophiles, including the small blue copper protein rusticyanin (involved in FeII oxidation), cytochrome oxidase subunit II and quinol-dependent nitric oxide reductase (qNOR). The protein folds and copper binding sites of rusticyanin are conserved in cytochrome oxidase aa3 subunit II, a protein complex that is responsible for the final passage of electrons to reduce oxygen. Therefore, we hypothesize that rusticyanin, cytochrome oxidase II and qNOR are evolutionarily related. Acknowledgments: Fondecyt 1130683.

The la Plata Astronomical Data Center

NASA Astrophysics Data System (ADS)

Marraco, H. G.

1990-11-01

RESUMEN. El Centro de Datos Astron6micos tiene su sede en la Facuitad de Ciencias Astron6micas y Geofisicas d la Universidad Nacional de La Plata y funciona por convenio entre esta facultad y el Centre des Stellaires de la Universite' Louis Pasteur en Estrasburgo (CDS), Francia. La finalidad de este centro es la de proveer a los astr6nomos del area con copias de los alrededor de 500 acumulados y/o preparados por el CDS a la vez que promover la producci6n y/o acumulaci6n de en el rea. Para la realizaci6n de esta tarea se cuenta con el apoyo del Centro Superior para el Procesamiento de la Informaci6n (CESPI) de la UNLP cuyos equipos se describen. Las tareas que se estan realizando incluyen la distribuci6n de SIMBAD a los astr6nomos argentinos y se efectuan ensayos de distribuci6n en linea de CD-ROM TEST DISK del Astronomical Data Center (ADC) de la NASA que contiene los 31 mas solicitados por los astr6nomos de todo el mundo. ABSTRACl The La Plata Astronomical Data Center operates by an agreement between the Facultad de Ciencias Astron6micas y Geofisicas at La Plata University and the Centre des Donnees Stellaires of Louis Pasteur University at Strasbourg (CDS), France. The purpose of the Center is to provide to the area astronomers with copies of the catalogs they need amongst those stored and/or prepared at CDS. At the same time the center will act of the astronomical data produced within its area. K words: DATA ANALYSIS

Identification and Assessment of Ongoing Educational and Community Programs for Spanish Speaking People. A Report Submitted to the Southwest Council of La Raza, Phoenix, Arizona.

ERIC Educational Resources Information Center

Valencia, Atilano A.

Synoptic reports on 16 selected educational and community programs for Spanish-speaking people are presented in this document. Each report consists of a brief description of the project, an assessment of the program, and recommendations for dissemination and implementation of the project model. Programs reviewed include: (1) The Good Samaritan…

Sexual performance of mass reared and wild Mediterranean fruit flies (Diptera: Tephritidae) from various origins of the Madeira Islands

DOE Office of Scientific and Technical Information (OSTI.GOV)

Pereira, R.; Silva, N.; Quintal, C.

jaula en el campo. Al mismo tiempo, el proceso de la domesticacion en el laboratorio fue evaluado. Tres poblaciones naturales, una poblacion semi-natural y una poblacion criada en masa fueron evaluadas: las poblaciones natural de (1) Isla de Madeira (costa norte), (2) Isla de Madeira (costa sur) y (3) Isla de Porto Santo; (4) una poblacion semi-natural despues de 7 a 10 generaciones de domesticacion en el laboratorio (respectivamente, para el primero y segundo experimento); y (5) la raza para separar sexos geneticamente que es usada en el laboratorio de la mosca mediterranea de Madeira (VIENNA 7mix2000). Los experimentos usando jaulas en el campo mostraron que las poblaciones de diferentes origines fueron en su mayor parte compatibles. No hubo diferencias significativas en la capacidad para competir sexualmente entre las poblaciones naturales. Los machos semi-naturales y los machos criados en masa mostraron un desempeno significativamente bajo en ambos experimentos que los machos naturales en el logro de copula con las hembras naturales. Este estudio indica que no hay un aislamiento significativo entre las razas probadas, aunque el desempeno en el apareamiento fue reducido en las moscas criadas en masa y semi-naturales despues de 7 a 10 generaciones en el laboratorio. (author)« less

Experimental Approach to Teaching Fluids

NASA Astrophysics Data System (ADS)

Stern, Catalina

2015-11-01

For the last 15 years we have promoted experimental work even in the theoretical courses. Fluids appear in the Physics curriculum of the National University of Mexico in two courses: Collective Phenomena in their sophomore year and Continuum Mechanics in their senior year. In both, students are asked for a final project. Surprisingly, at least 85% choose an experimental subject even though this means working extra hours every week. Some of the experiments were shown in this congress two years ago. This time we present some new results and the methodology we use in the classroom. I acknowledge support from the Physics Department, Facultad de Ciencias, UNAM.

The Cauchy problem for the Pavlov equation

NASA Astrophysics Data System (ADS)

Grinevich, P. G.; Santini, P. M.; Wu, D.

2015-10-01

Commutation of multidimensional vector fields leads to integrable nonlinear dispersionless PDEs that arise in various problems of mathematical physics and have been intensively studied in recent literature. This report aims to solve the scattering and inverse scattering problem for integrable dispersionless PDEs, recently introduced just at a formal level, concentrating on the prototypical example of the Pavlov equation, and to justify an existence theorem for global bounded solutions of the associated Cauchy problem with small data. An essential part of this work was made during the visit of the three authors to the Centro Internacional de Ciencias in Cuernavaca, Mexico in November-December 2012.

Student designed experiments to learn fluids

NASA Astrophysics Data System (ADS)

Stern, Catalina

2013-11-01

Lasers and high speed cameras are a wonderful tool to visualize the very complex behavior of fluids, and to help students grasp concepts like turbulence, surface tension and vorticity. In this work we present experiments done by physics students in their senior year at the School of Science of the National University of Mexico as a final project in the continuum mechanics course. Every semester, the students make an oral presentation of their work and videos and images are kept in the web page ``Pasión por los Fluidos''. I acknowledge support from the Physics Department of Facultad de Ciencias, Universidad Nacional Autónoma de México.

[Transportation networks and means in the development of scientific expeditions in Argentina (1850-1910)].

PubMed

Farro, Máximo E

2008-01-01

The article explores the relation between the advance of transportation technology and the development of scientific expeditions between the late nineteenth and early twentieth centuries in Argentina. Expansion of the railway network on a national scale impacted the development of the earth sciences by facilitating access to distant places by scientific institutions located in Córdoba, Buenos Aires, and La Plata and also by simplifying the movement of equipment, scientific collections, and personnel. Hermann Burmeister's expedition (1857-60), expeditions by scientists from the Academia Nacional de Ciencias de Córdoba, and archeological digs in the northwestern provinces, organized by scientific institutions headquartered in Buenos Aires and La Plata, serve as examples.

Experimental microbubble generation by sudden pressure drop and fluidics

NASA Astrophysics Data System (ADS)

Franco Gutierrez, Fernando; Figueroa Espinoza, Bernardo; Aguilar Corona, Alicia; Vargas Correa, Jesus; Solorio Diaz, Gildardo

2014-11-01

Mass and heat transfer, as well as chemical species in bubbly flow are of importance in environmental and industrial applications. Microbubbles are well suited to these applications due to the large interface contact area and residence time. The objective of this investigation is to build devices to produce microbubbles using two methods: pressure differences and fluidics. Some characteristics, advantages and drawbacks of both methods are briefly discussed, as well as the characterization of the bubbly suspensions in terms of parameters such as the pressure jump and bubble equivalent diameter distribution. The authors acknowledge the support of Consejo Nacional de Ciencia y Tecnología.

Wind profiler installed in Antarctica

NASA Astrophysics Data System (ADS)

Balsley, B. B.; Carey, J.; Woodman, R. F.; Sarango, M.; Urbina, J.; Rodriguez, R.; Ragaini, E.

A VHF (50 MHz) wind profiler was installed in Antarctica at the Peruvian Base “Machu Picchu” on King George Island from January 21 to 26. The wind profiler will provide a first look at atmospheric dynamics over the region.The profiler—the first of its kind in Antarctica—is a National Science Foundationsponsored cooperative project of the University of Colorado, the Geophysical Institute of Peru, the University of Piura (Peru), and the Peruvian Navy. This venture was also greatly facilitated by Peru's Comision Nacional de Asuntos Antartidos and Consejo Nacional de Ciencias y Tecnologia, with additional logis tics support provided by the Argentinean Navy and the Uruguayan Air Force.

Effective diffusion of confined active Brownian swimmers

NASA Astrophysics Data System (ADS)

Sandoval, Mario; Dagdug, Leonardo

2014-11-01

We find theoretically the effect of confinement and thermal fluctuations, on the diffusivity of a spherical active swimmer moving inside a two-dimensional narrow cavity of general shape. The explicit formulas for the effective diffusion coefficient of a swimmer moving inside two particular cavities are presented. We also compare our analytical results with Brownian Dynamics simulations and we obtain excellent agreement. L.D. thanks Consejo Nacional de Ciencia y Tecnologia (CONACyT) Mexico, for partial support by Grant No. 176452. M. S. thanks CONACyT and Programa de Mejoramiento de Profesorado (PROMEP) for partially funding this work under Grant No. 103.5/13/6732.

Web 2.0 Tools in the Prevention of Curable Sexually Transmitted Diseases: Scoping Review

PubMed Central

2018-01-01

Background The internet is now the primary source of information that young people use to get information on issues related to sex, contraception, and sexually transmitted infections. Objective The goal of the research was to review the scientific literature related to the use of Web 2.0 tools as opposed to other strategies in the prevention of curable sexually transmitted diseases (STDs). Methods A scoping review was performed on the documentation indexed in the bibliographic databases MEDLINE, Cochrane Library, Scopus, Cumulative Index to Nursing and Allied Health Literature, Web of Science, Literatura Latinoamericana y del Caribe en Ciencias de la Salud, PsycINFO, Educational Resources Information Center, the databases of Centro Superior de Investigaciones Científicas in Spain, and the Índice Bibliográfico Español de Ciencias de la Salud from the first available date according to the characteristics of each database until April 2017. The equation search was realized by means of the using of descriptors together with the consultation of the fields of title register and summary with free terms. Bibliographies of the selected papers were searched for additional articles. Results A total of 627 references were retrieved, of which 6 papers were selected after applying the inclusion and exclusion criteria. The STDs studied were chlamydia, gonorrhea, and syphilis. The Web 2.0 tools used were Facebook, Twitter, Instagram, and YouTube. The 6 papers used Web 2.0 in the promotion of STD detection. Conclusions Web 2.0 tools have demonstrated a positive effect on the promotion of prevention strategies for STDs and can help attract and link youth to campaigns related to sexual health. These tools can be combined with other interventions. In any case, Web 2.0 and especially Facebook have all the potential to become essential instruments for public health. PMID:29567633

[Risk factors of necrotizing enterocolitis].

PubMed

Tapia-Rombo, C A; Velasco-Lavín, M R; Nieto-Caldelas, A

1993-09-01

The purpose of the present study is to compare risk factors of necrotizing enterocolitis (NEC) between two group: group A, newborns with the disease and group B, newborns with other diseases different from NEC, in order to know if these risk factors are more frequent or not in the first group. We assessed the clinical records of all the patients hospitalized in the Neonatal Intensive Care Unit and Neonatology Service of the La Raza General Hospital between 1987 and 1991 with the diagnosis of NEC. They were compared with 65 clinical records chosen at random of patients hospitalized in the same Unit with other diagnosis at the same time, and who were discharged by improvement or deceased. In all of them were look for known risk factors for NEC generally accepted such as: prematurity, neonatal asphyxia, poliglobulia, cyanotic congenital heart disease, patent ductus arteriosus, respiratory distress syndrome, catheterization of umbilical vessels, early feeding of elevated formula increases, exchange exchange transfusion, hypoxic ischemic encephalopathy, infection, etc. Just 25 records of the possible 50 with the diagnosis of NEC full filled inclusion criteria. There were no statistically significant difference in weight, sex, mortality and known risk factors of NEC between both groups. Were concluded that NEC is a disease of unknown etiology that should be studied more thoroughly. The known risk factors must be avoided because the patient susceptibility probably play an important role.

Genomic Characterization of the Genus Nairovirus (Family Bunyaviridae).

PubMed

Kuhn, Jens H; Wiley, Michael R; Rodriguez, Sergio E; Bào, Yīmíng; Prieto, Karla; Travassos da Rosa, Amelia P A; Guzman, Hilda; Savji, Nazir; Ladner, Jason T; Tesh, Robert B; Wada, Jiro; Jahrling, Peter B; Bente, Dennis A; Palacios, Gustavo

2016-06-10

Nairovirus, one of five bunyaviral genera, includes seven species. Genomic sequence information is limited for members of the Dera Ghazi Khan, Hughes, Qalyub, Sakhalin, and Thiafora nairovirus species. We used next-generation sequencing and historical virus-culture samples to determine 14 complete and nine coding-complete nairoviral genome sequences to further characterize these species. Previously unsequenced viruses include Abu Mina, Clo Mor, Great Saltee, Hughes, Raza, Sakhalin, Soldado, and Tillamook viruses. In addition, we present genomic sequence information on additional isolates of previously sequenced Avalon, Dugbe, Sapphire II, and Zirqa viruses. Finally, we identify Tunis virus, previously thought to be a phlebovirus, as an isolate of Abu Hammad virus. Phylogenetic analyses indicate the need for reassignment of Sapphire II virus to Dera Ghazi Khan nairovirus and reassignment of Hazara, Tofla, and Nairobi sheep disease viruses to novel species. We also propose new species for the Kasokero group (Kasokero, Leopards Hill, Yogue viruses), the Ketarah group (Gossas, Issyk-kul, Keterah/soft tick viruses) and the Burana group (Wēnzhōu tick virus, Huángpí tick virus 1, Tǎchéng tick virus 1). Our analyses emphasize the sister relationship of nairoviruses and arenaviruses, and indicate that several nairo-like viruses (Shāyáng spider virus 1, Xīnzhōu spider virus, Sānxiá water strider virus 1, South Bay virus, Wǔhàn millipede virus 2) require establishment of novel genera in a larger nairovirus-arenavirus supergroup.

[Overweigth, obesity, metabolic syndrome and waist/height index in health staff].

PubMed

del Pilar Cruz-Domínguez, Maria; González-Márquez, Fabiola; Ayala-López, Ernesto A; Vera-Lastra, Olga Lidia; Vargas-Rendón, Gerardo H; Zárate-Amador, Alfonso; Jara-Quezada, Luis Javier

2015-01-01

Health staff self-applied strategies are insufficiently to reduce cardiovascular risk factors. The aim of this article is to investigate the prevalence of overweight, obesity and metabolic syndrome and waist/height index on health staff. This is a cross-sectional study from January to April 2014 in 735 workers of the UMAE Specialties La Raza. A diagnosis of overweight and obesity was established according to WHO criteria and metabolic syndrome NCEP ATP-III. In 250 participants lipid profile and blood chemistry were obtained. Descriptive statistics was applied, chi square, Student t test or Kruskal-Wallis to compare groups. We included 496 women and 239 men (physicians, nurses and other workers). 38% were overweight; 22% had obesity. We found fasting hyperglycemia>126 mg/dl in 5.1%, between 100-126 mg/dl in 17.4%, hypertriglyceridemia in 40.4%; HDL cholesterol<40 mg/dl 66% in men and HDL cholesterol<50 mg/dl 51.4% in women. Waist measurement was 93±11 cm in men vs. 88±13 m in women. The waist/height index in the ideal weight group was 0.048±0.04, for overweight 0.55±0.04 and for obesity 0.65±0.064 (p<0.01). Metabolic syndrome prevalence was 30.6%, smoking 21.6% and alcohol consumption 35%. The prevalence of obesity-overweight was 60% and metabolic syndrome 30%, making it necessary to take immediate actions to modify the lifestyle of health staff.

Ciencias en Espanol, 1995-96 (Sciences in Spanish, 1995-96). Research Report on Educational Grants.

ERIC Educational Resources Information Center

Houston Independent School District, TX. Dept. of Research and Evaluation.

An elementary science program was taught in Spanish for English-speaking children to give them the opportunity to acquire second language skills through hands-on science instruction. The program included 4 classes of approximately 22 students at kindergarten and first-grade levels in the gifted and talented program at the Gary Herod Elementary…

A Integracao de Ensino das Ciencias da Saude (An Integrated Medical Education Program [in Brazil]).

ERIC Educational Resources Information Center

Pourchet-Campos, M. A.; Guimaraes Junior, Paulino

At the Sixth Annual Reunion of the Brazilian Association of Medical Schools (VI Reuniao Anual da Associacao Brasileira de Escolas Medicas) leaders in the Brazilian medical profession proposed an integrated educational program for training students in the fields of medicine and public health. Under Brazil's present system of education, all…

[Cathedrals to sciences or temples of knowledge? The museums of natural sciences of Cordoba, Argentina, by the end of the 19th century].

PubMed

Tognetti, L

2001-01-01

The museums of Botany, Mineralogy and Zoology of the Facultad de Ciencias Físico-Matemáticas were created along with a world wide phenomenon, defined by some authors as the "museum movement," in a time the basics of this movement were being restructured. Thus, this work intends to go over the building stage of the natural history museums in a peripheral domain --- Cordoba by the end of the 19th century --- in order to partially understand this transition process. The strategy is to analyze the collections and find out how and why they were gathered. Two other aspects are also relevant: the human resources and the funds these institutions were granted.

Application of E-learning tools for the teaching of Natural Science. A case related to Astronomy

NASA Astrophysics Data System (ADS)

Goldes, G.; Gallino, M.; Britos, D.; Lago, D.; Tavella, G.; Vidal, E.; Morales, S.; Nicotra, M.

The requirements, recent experiences and projections of the application of virtual learning techniques and environments for the teaching of basic sciences at the National University of Córdoba, Argentina, are described. The reasons to still consider basic science E-learning as an institutional vacancy area are discussed. Present activities designed to revert this situation are also discussed. A particular experience about the application of tics as a complementary resource for teaching astronomy at the University is described and discussed on the basis of both strengths and limitations. The organization of E-learning activities at the Faculty of Engineering, Biology and Geology ("Facultad de Ciencias Exactas, Físicas y Naturales") is discussed in some detail.

Internal parasites of free-ranging guanacos from Patagonia.

PubMed

Beldomenico, P M; Uhart, M; Bono, M F; Marull, C; Baldi, R; Peralta, J L

2003-12-01

In the winter of 2000, a greater than 80% reduction in the guanaco population located in Cabo Dos Bahi;as Wildlife Reserve, Chubut, Argentina, was evident due to massive mortality attributed to starvation. Twelve guanacos were necropsied and samples were analyzed at the Parasitology Laboratory of Facultad de Ciencias Veterinarias, Universidad Nacional del Litoral. Fecal analysis revealed developmental stages of Nematodirus sp., Marshallagia sp., Trichuris sp. and Eimeria spp. Histopathological analysis showed the presence of Sarcocystis sp. in muscle and fascia cysts. Other parasites recovered included Dictyocaulus filaria, Trichuris tenuis and Moniezia expansa. Of these, D. filaria and M. expansa possibly reflect interactions with domestic sheep. This is the first time that T. tenuis has been reported in guanacos.

DOE Office of Scientific and Technical Information (OSTI.GOV)

Alpirez, G.M.

Since 1983, the Engineering Institute at the Universidad Autonoma de Baja California (UABC) has offered a Geothermal Diploma Program. Sixty three students coming from different disciplines, have successfully completed the Program . This Program was offered by the UABC in collaboration with the Instituto de Investigaciones Electricas (IIE) and the Consejo Nacional de Ciencia y Tecnologia. A year later (1984), the Comision Federal de Electricidad joined in strengthening the program. Many trainees were sponsored by IIE and CONACYT. Since 1993, the program is not supported by them. They now only support Master and Ph.D. programs. This paper presents a reviewmore » of the geothermal program from 1983 to 1994.« less

Femtochemistry of confined water

NASA Astrophysics Data System (ADS)

Douhal, A.; Carranza, M. A.; Sanz, M.; Organero, J. A.; Santos, L.

In this contribution, we applied ultrafast spectroscopy to study the H-bond network of water confined in nanostructures (Cyclodextrins and Micelles). We examine the effect of caging on ultrafast reaction dynamics and discuss the related processes under different experimental conditions. The results show an ultrafast dynamic giving birth to intermediates of the probe, which show femtosecond and picosecond dynamics leading to the final structure at the excited state. The results show the high sensitivity of the used technique in detecting small of water. This work was supported by the Ministry of Science and Technology (MCYT, Spain) and ``Conserjería de Ciencia y Tecnologia de la JCCM, Spain'' through projects MAT2002-01829 and PAI-02-004.

Planar Lattice Instability in LA2CUO4.1 across the Superconducting Transition

NASA Astrophysics Data System (ADS)

Acosta-Alejandro, Manuel; Mustre-de Leon, Jose; Conradson, Steven

2001-03-01

The local atomic structure of La2CuO4.1 around Cu K-edge is analyzed for 10Ciencia y Tecnología (CONACYT, México) under Grant. No. 31274-U.

Mixing against culture vs mixing against nature: ontologization of prohibited interethnic relationships.

PubMed

Roncarati, Alessandra; Pérez, Juan A; Ravenna, Marcella; Navarro-Pertusa, Esperanza

2009-02-01

In this paper, we develop the theory of ontologization: Social representations that prevent members of minority and majority groups who are living in contact with each other to mingle. The process of ontologization consists of separating some humans from their own species, and anchoring them in another environment, that of an animal, for example. We propose that underlying the famous slogan "equal but separate" is the social representation of interracial mixing as a "counter-nature" phenomenon. It is predicted that a sexual relationship between people of different "races" leads to a greater degree of ontologization, and, as such, this miscegenation will be explained in terms of biologistic thinking, like an instinctive nature or atavistic animal impulse. An experiment (N = 360) features the case of a woman who, though already in a stable relationship, is unfaithful to her partner. In a 2×3 factor design, the ethnic-national identity of this woman (in-group: Spanish/Italian vs out-group: Senegalese) and the ethnic-national identity of her lovers (in-group: Spanish/Italian vs out-group: Rumanian vs out-group: Senegalese) were manipulated. In general, results fit the hypothesis of ontologization in interracial conditions better, rather than the customary in-group favouritism and/or out-group discrimination bias. We then go on to discuss the way in which a biologistic way of thinking enables a differentiation at the human level, in terms of culture groups and nature groups, in "races," so that an interracial sexual relationship is seen as evidence of a wild and irrepressible impulse, which stigmatizes the people involved in these relationships. This research was supported by the Italian/Spanish Integrated Action Program HI2004_0241 and the Spanish Ministerio de Ciencia y Tecnología BSO2003-00476/PSCE. Dans cet article, nous développons la théorie de l'ontologisation: des représentations sociales qui empêchent les membres des groupes minoritaire et majoritaire

DOE Office of Scientific and Technical Information (OSTI.GOV)

Alfaro, R.; Sandoval, A.; Cruz, E.

We have performed radiation tolerance tests on the BCF-99-29MC wavelength shifting fibers and the BC404 plastic scintillator from Bicron as well as on silicon rubber optical couplers. We used the 60Co gamma source at the Instituto de Ciencias Nucleares facility to irradiate 30-cm fiber samples with doses from 50 Krad to 1 Mrad. We also irradiated a 10x10 cm2 scintillator detector with the WLS fibers embedded on it with a 200 krad dose and the optical conectors between the scintillator and the PMT with doses from 100 to 300 krad. We measured the radiation damage on the materials by comparingmore » the pre- and post-irradiation optical transparency as a function of time.« less

Cuadernos Médico Sociales from Rosario, Argentina, and other Latin American social medicine journals from the 1970s and 1980s.

PubMed

Spinelli, Hugo; Librandi, Juan Martín; Zabala, Juan Pablo

2017-01-01

In the 1970s and 1980s, a series of journals were founded to disseminate ideas from Latin American social medicine in various countries across the continent, during the early stage of a movement that would later become institutionalized in Brazil under the name "collective medicine." In this article, we look at the principal characteristics of those endeavors: Revista Centroamericana de Ciencias de la Salud, Saúde em Debate, Salud Problema, Revista Latinoamericana de Salud and Cuadernos Médico Sociales. We focus in particular on Cuadernos Médico Sociales, published in Rosario, Argentina. We analyze the conditions under which this publication emerged, the editorial processes it followed, and the central role played by Carlos Bloch, its founder and managing editor.

Influence of Heliospheric Current Sheet presence on geomagnetic storm originated by Magnetic Clouds.

NASA Astrophysics Data System (ADS)

Hidalgo, M. A.; Blanco, J. J.

2006-12-01

It is well known the importance of Magnetic Cloud (MC) on the Magnetosphere and its influence as cause of strong geomagnetic activity, especially fast magnetic cloud. Sometimes magnetic cloud travels in solar wind close to the Heliospheric Current Sheet (HCS). We wonder if the HCS presence plays some role on the geomagnetic storm development. In this work we will try to respond to this question comparing the effect on the Magnetosphere of MC+HCS and MC without HCS, detected by WIND instruments. This work has been supported by the Spanish Comisión Internacional de Ciencia y Tecnología (CICYT), grant ESP2005-07290-C02-01 and ESP2006-08459 and Madrid Autonomous Community / University of Alcala grant CAM-UAH 2005/007.

An investigation of water production rates by irregularly shaped cometary nuclei.

NASA Astrophysics Data System (ADS)

Gutierrez, P. J.; Ortiz, J. L.; Rodrigo, R.; Lopez-Moreno, J. J.

1999-09-01

A computer code has been developed to derive water production rates for rotating irregularly shaped nuclei with topography (both craters and mountains) as a function of heliocentric distance. The code solves the surface energy balance equation including heat diffusion in the normal direction and taking into account shadowing effects, for any combination of orbital parameters, spin axis orientation, rotation period, and physical properties of the nucleus (geometric albedo, emissivity, thermodynamical properties). Preliminary results are presented for several representative objects. The research described in this abstract is being carried out at the Instituto de Astrofísica de Andalucía and is supported by the Comision Interministerial de Ciencia y Tecnología under contracts ESP96-0623 and ESP97-1773-CO3-01.

Investigación del USGS sobre el ecosistema de arrecifes de coral en el Atlántico

USGS Publications Warehouse

Kuffner, Ilsa B.; Yates, Kimberly K.; Zawada, David G.; Richey, Julie N.; Kellogg, Christina A.; Toth, Lauren T.; Torres-Garcia, Legna M.

2015-10-23

Los arrecifes de coral son estructuras sólidas, biomineralizadas que protegen comunidades costeras actuando como barreras protectoras de peligros tales como los huracanes y los tsunamis. Estos proveen arena a las playas a través de procesos naturales de erosión, fomentan la industria del turismo, las actividades recreacionales y proveen hábitats pesqueros esenciales. La conti-nua degradación mundial de ecosistemas de arrecifes de coral está bien documentada. Existe la necesidad de enfoque y organización de la ciencia para entender los procesos complejos físicos y biológicos e interacciones que están afectando el estado de los arrecifes coralinos y su capacidad para responder a un entorno cambiante.

Actitudes y practicas educativas hacia la inclusion de estudiantes con impedimentos en la ensenanza de Ciencia

NASA Astrophysics Data System (ADS)

Vargas Rodriguez, Mayra

This research is about the attitudes and educational practices towards inclusion of students with disabilities in science classroom. Four research questions were raised: (1) What are the attitudes of science teachers about the inclusion of students with disabilities?, (2) What is the relationship between attitudes and teachers demographics characteristics?, (3) What are the factors that influence the attitudes of science teachers? and (4) What does the Science teachers do in their educational practices to teach students with disabilities? A mixed design of two phases was performed to answer this question. In the first phase a questionnaire was submit to 79 Science teachers from the middle and high school level. This questionnaire with the title Attitudes and educational practices towards inclusion of students with disabilities in Science teaching was developed by the researcher. In the second phase a focus group was conducted with Science and Special Education teachers. Also, two structured interviews by telephone were conducted. The findings indicate that the attitudes of science teachers who participated in the first phase of this research seems to be neutral. However, in their responses to the interview or focus group the attitudes were perceived negative. This attitudes are influences by a number of factors that hinder the process of inclusion. Using a nonparametric test with a chi-square test, it was determined that the number of students in a classroom is one of the factors that have a significant relationship with attitudes. The modifications that Science teachers do in their educational practices these will depend on the discapacities. But usually the modification will be in the evaluation of the students. Using assessments as a technique. Also, individualized instruction and peers are educational practices that highlight.

"Palabras de la ciencia": Pedro Castera and Scientific Writing in Mexico's Fin de Siècle

NASA Astrophysics Data System (ADS)

Blanco, María del Pilar

2014-03-01

This essay explores the career of the understudied writer Pedro Castera (1846-1906), who is regarded as one of the first practitioners of science fiction in Mexico. A man of many talents, Castera is one of the most eccentric and eclectic figures in the intellectual life of fin-de-siècle Mexico City. His career took many turns: While during specific periods he devoted himself to writing and participating within the liberal, cosmopolitan culture of Mexico City, he often disappeared from the public eye to devote himself to the development of inventions in the mining industry. The essay discusses the different meanings of `invention' within Castera's oeuvre, namely poetic and scientific innovation. Setting these two concepts within the domains of literature and scientific writing in the global and local fin de siècle, the essay investigates how Castera's journalism and fiction (specifically his 1890 novel Querens) are representative of the wider question of scientific development in Mexico and Latin America as a whole during the nineteenth century. Furthermore, it explores the intersections of aesthetics and science during a critical period of modern intellectual history, in which these two areas of knowledge were gradually defining themselves as two distinctive cultures.

"Palabras de la Ciencia": Pedro Castera and Scientific Writing in Mexico's "Fin de Siècle"

ERIC Educational Resources Information Center

del Pilar Blanco, María

2014-01-01

This essay explores the career of the understudied writer Pedro Castera (1846-1906), who is regarded as one of the first practitioners of science fiction in Mexico. A man of many talents, Castera is one of the most eccentric and eclectic figures in the intellectual life of fin-de-siècle Mexico City. His career took many turns: While during…

Modeling month-season of birth as a risk factor in mouse models of chronic disease: from multiple sclerosis to autoimmune encephalomyelitis.

PubMed

Reynolds, Jacob D; Case, Laure K; Krementsov, Dimitry N; Raza, Abbas; Bartiss, Rose; Teuscher, Cory

2017-06-01

Month-season of birth (M-SOB) is a risk factor in multiple chronic diseases, including multiple sclerosis (MS), where the lowest and greatest risk of developing MS coincide with the lowest and highest birth rates, respectively. To determine whether M-SOB effects in such chronic diseases as MS can be experimentally modeled, we examined the effect of M-SOB on susceptibility of C57BL/6J mice to experimental autoimmune encephalomyelitis (EAE). As in MS, mice that were born during the M-SOB with the lowest birth rate were less susceptible to EAE than mice born during the M-SOB with the highest birth rate. We also show that the M-SOB effect on EAE susceptibility is associated with differential production of multiple cytokines/chemokines by neuroantigen-specific T cells that are known to play a role in EAE pathogenesis. Taken together, these results support the existence of an M-SOB effect that may reflect seasonally dependent developmental differences in adaptive immune responses to self-antigens independent of external stimuli, including exposure to sunlight and vitamin D. Moreover, our documentation of an M-SOB effect on EAE susceptibility in mice allows for modeling and detailed analysis of mechanisms that underlie the M-SOB effect in not only MS but in numerous other diseases in which M-SOB impacts susceptibility.-Reynolds, J. D., Case, L. K., Krementsov, D. N., Raza, A., Bartiss, R., Teuscher, C. Modeling month-season of birth as a risk factor in mouse models of chronic disease: from multiple sclerosis to autoimmune encephalomyelitis. © FASEB.

Raza de Tesoros. Programa de Lectura y Ensenanza del Lenguaje, Unidad B. Guia para el Maestro (Race of Treasures. Reading and Language Learning Program, Unit B. Teacher's Guide).

ERIC Educational Resources Information Center

Dissemination and Assessment Center for Bilingual Education, Austin, TX.

This is the teacher's guide accompanying a reader and a workbook that are part of an ungraded language arts and reading program that can be used in classes from upper elementary through high school. The program is designed around reading selections which present aspects of history, culture, and present-day experiences of special relevance to the…

Counter-Narratives of La Raza Voces: An Exploration of the Personal and Professional Lived Experiences of Mexican-American/Chicana/o Faculty at California Catholic Institutions of Higher Education

ERIC Educational Resources Information Center

Serrano, Frank V.

2013-01-01

Faculty members of color time and again encounter the greatest number of challenges and barriers (e.g., discrimination, isolation, marginalization, tokenism, inundated with workloads and service commitments, devalued research, and delayed promotion and tenure) in both entering academia and succeeding within academia. The purpose of this study was…

Web 2.0 Tools in the Prevention of Curable Sexually Transmitted Diseases: Scoping Review.

PubMed

Sanz-Lorente, María; Wanden-Berghe, Carmina; Castejón-Bolea, Ramón; Sanz-Valero, Javier

2018-03-22

The internet is now the primary source of information that young people use to get information on issues related to sex, contraception, and sexually transmitted infections. The goal of the research was to review the scientific literature related to the use of Web 2.0 tools as opposed to other strategies in the prevention of curable sexually transmitted diseases (STDs). A scoping review was performed on the documentation indexed in the bibliographic databases MEDLINE, Cochrane Library, Scopus, Cumulative Index to Nursing and Allied Health Literature, Web of Science, Literatura Latinoamericana y del Caribe en Ciencias de la Salud, PsycINFO, Educational Resources Information Center, the databases of Centro Superior de Investigaciones Científicas in Spain, and the Índice Bibliográfico Español de Ciencias de la Salud from the first available date according to the characteristics of each database until April 2017. The equation search was realized by means of the using of descriptors together with the consultation of the fields of title register and summary with free terms. Bibliographies of the selected papers were searched for additional articles. A total of 627 references were retrieved, of which 6 papers were selected after applying the inclusion and exclusion criteria. The STDs studied were chlamydia, gonorrhea, and syphilis. The Web 2.0 tools used were Facebook, Twitter, Instagram, and YouTube. The 6 papers used Web 2.0 in the promotion of STD detection. Web 2.0 tools have demonstrated a positive effect on the promotion of prevention strategies for STDs and can help attract and link youth to campaigns related to sexual health. These tools can be combined with other interventions. In any case, Web 2.0 and especially Facebook have all the potential to become essential instruments for public health. ©María Sanz-Lorente, Carmina Wanden-Berghe, Ramón Castejón-Bolea, Javier Sanz-Valero. Originally published in the Journal of Medical Internet Research (http

Fronts and Thermohaline Structure of the Brazil Current Confluence System

NASA Astrophysics Data System (ADS)

Severov, Dimitri

and Thermohaline Structure of the Brazil Current Confluence System (BCCS) are stud-ied from climatic data, "Marathon Exp. Leg.8, 1984"data, and two Sea surface temperature (SST) data bases: "Meteor satellite"(1989-1994) and "ds277-Reynolds" (1981-2000).The South Atlantic Central Water (SACW) is divided in two main types: tropical (TW) and subtropical water (ST). Water masses, fronts, inter-frontal and frontal zones are analysed and classified: a) the water masses: Tropical Low-Salinity Water, Tropical Surface Water, Tropical Tropospheric Water, Subtropical Low-Salinity Water, Subtropical Surface Water, Subtropical Tropospheric Water. T,S characteristics of intermediate, deep and bottom water defined by different authors are confirmed and completed; b) the Inter-frontal Zones: Tropical/Brazil Current Zone, Sub-tropical Zone and Subantarctic Zone; c) the Frontal Zones: Subtropical, Subantarctic and Polar, and d) the Fronts: Subtropical Front of the Brazil Current, Principal Subtropical Front, North Subtropical Front, Subtropical Surface Front, South Subtropical Front, Subantarctic Surface Front, Subantarctic Front and Polar Front. Several stable T-S relationships are found below the friction layer and at the Fronts. The maximum gradient of the oceanographic characteris-tics occurs at the Brazil Current Front, which can be any of the subtropical fronts, depending on season. Minimum mean depth of the pycnocline coincides with the fronts of the BCCS, indicating the paths of low-salinity shelf waters into the open ocean. D. N. Severov (a) , V. Pshennikov (b) and A.V. Remeslo (c) a -Sección Oceanologé Facultad de Ciencia, Universidad de la Republica, Igué 4225, 11400 ıa, a Montevideo, Uruguay. Tel. (598-2) 525-8618, Fax (598-2) 525-8617, mail: dima@fcien.edu.uy b -Instituto de Física, Facultad de Ciencias, Universidad de la Republica, Igué 4225, 11400 Mon-a tevideo, Uruguay, mail: seva@fisica.edu.uy c -Atlantic Research Inst. For Fisheries Oceanology (Atlant

More than science: family learning in a Mexican science museum

NASA Astrophysics Data System (ADS)

Briseño-Garzón, Adriana

2013-06-01

Latin American audiences living in their countries of origin are poorly understood as museum learners due to the scarcity of research in this field. Through a case study approach, I investigate and report on the ways of learning of 20 Mexican family groups. In particular, I examine the influence of the Mexican sociocultural context on the participant family members' learning outcomes from a Mexican science museum. Conducted in Universum Museo de las Ciencias, a science museum located in Mexico City, this research study is based on the premise that understanding the role of the sociocultural elements of learning is essential to understanding the nature of learning in museums. The cognitive and social outcomes of the participants are discussed in the light of the sociocultural elements that define Mexicans as museum learners.

PREVENCIÓN DEL VIH/SIDA EN LOS CIRCUITOS DE LEVANTE HSH: UNA ASIGNATURA PENDIENTE.

PubMed

Barreda, Victoria; Carballo-Dieguez, Alex; Marone, Rubén; Balán, Iván; Pando, María Ángeles; Avila, María Mercedes

2010-12-01

A partir de un relevamiento de tipo etnográfico, se describen lugares de encuentro de HSH en la Ciudad de Buenos Aires y sus prácticas sexuales. El reconocimiento de tales espacios, así como las características que asumen en ellos los encuentros sexuales entre los HSH, plantean obstáculos específicos en la adopción de comportamientos preventivos y, asimismo, generan nuevos desafíos para las actividades de prevención. Se plantean las dificultades y debates conceptuales que la misma categoría presenta, y sus consecuencias en el abordaje preventivo y teórico-metodológico para las ciencias sociales. Además, se proponen nuevos interrogantes acerca de los alcances y las limitaciones del modelo preventivo del VIH/Sida para HSH.

[Health education trough the development of scientific skills in Chilean schools].

PubMed

Burgos, Soledad; Yohannessen, Karla; Álvarez, Andrea; Rebolledo, Alejandro; Valenzuela, María Teresa

2017-01-01

To describe the interests, preferred topics and learning in public health issues emerging from Chilean students with their participation in a science education experience. A qualitative exploratory study was conducted in 29 school research groups through the project Salud Con-Ciencia en tu Barrio, based on a content analysis of texts and narratives of students. Students prioritize the situation of abandoned animals, waste management, security and urban infrastructure, mainly. They view the role of social actors, the positive/negative impacts on the community, valuing the knowledge gained through observation neighborhoods and interaction with neighbors. Scientific inquiry school in the neighborhood context provides teaching strategies for the promotion of local health, develops basic notions of community health and motivation in students linked to the socio-environmental reality of their neighborhoods.

QUEST1 Variability Survey. II. Variability Determination Criteria and 200k Light Curve Catalog

NASA Astrophysics Data System (ADS)

Rengstorf, A. W.; Mufson, S. L.; Andrews, P.; Honeycutt, R. K.; Vivas, A. K.; Abad, C.; Adams, B.; Bailyn, C.; Baltay, C.; Bongiovanni, A.; Briceño, C.; Bruzual, G.; Coppi, P.; Della Prugna, F.; Emmet, W.; Ferrín, I.; Fuenmayor, F.; Gebhard, M.; Hernández, J.; Magris, G.; Musser, J.; Naranjo, O.; Oemler, A.; Rosenzweig, P.; Sabbey, C. N.; Sánchez, Ge.; Sánchez, Gu.; Schaefer, B.; Schenner, H.; Sinnott, J.; Snyder, J. A.; Sofia, S.; Stock, J.; van Altena, W.

2004-12-01

The QUEST (QUasar Equatorial Survey Team) Phase 1 camera has collected multibandpass photometry on a large strip of high Galactic latitude sky over a period of 26 months. This robust data set has been reduced and nightly catalogs compared to determine the photometric variability of the ensemble objects. Subsequent spectroscopic observations have confirmed a subset of the photometric variables as quasars, as previously reported. This paper reports on the details of the data reduction and analysis pipeline and presents multiple bandpass light curves for 198,213 QUEST1 objects, along with global variability information and matched Sloan photometry. Based on observations obtained at the Llano del Hato National Astronomical Observatory, operated by the Centro de Investigaciones de Astronomía for the Ministerio de Ciencia y Tecnologia of Venezuela.

Committees and sponsors

NASA Astrophysics Data System (ADS)

2011-10-01

International Advisory Committee Richard F CastenYale, USA Luiz Carlos ChamonSão Paulo, Brazil Osvaldo CivitareseLa Plata, Argentina Jozsef CsehATOMKI, Hungary Jerry P DraayerLSU, USA Alfredo Galindo-UribarriORNL & UT, USA James J KolataNotre Dame, USA Jorge López UTEP, USA Joseph B NatowitzTexas A & M, USA Ma Esther Ortiz IF-UNAM Stuart PittelDelaware, USA Andrés SandovalIF-UNAM Adam SzczepaniakIndiana, USA Piet Van IsackerGANIL, France Michael WiescherNotre Dame, USA Organizing Committee Libertad Barrón-Palos (Chair)IF-UNAM Roelof BijkerICN-UNAM Ruben FossionICN-UNAM David LizcanoININ Sponsors Instituto de Ciencias Nucleares, UNAMInstituto de Física, UNAMInstituto Nacional de Investigaciones NuclearesDivisión de Física Nuclear de la SMFCentro Latinoamericano de Física

Inclusion of Visually Impaired in the School Programme Scheduled Visit of the Museu de Astronomia e Ciências Afins (MAST). (Breton Title: Inclusão de Deficientes Visuais no Programa de Visita Escolar Programada do Museu de Astronomia e Ciências Afins (MAST).) Inclusión de Discapacitados Visuales en el Programa Escolar Programado del Museo de Astronomía y Ciencias Afines (MAST)

NASA Astrophysics Data System (ADS)

de Oliveira Gonçalves, Carla; da Conceição Barbosa-Lima, Maria

2013-07-01

que enfrentan dificultades en la escuela. La inclusión debe estar en todas las instituciones educacionales (formales o no). Nuestro objetivo en el trabajo de final de curso de licenciatura, fue el de presentar un relato de la experiencia de mediación a los alumnos con deficiencias visuales del Instituto Benjamin Constant (IBC) en el Museo de Astronomía y Ciencias Afines (MAST) y las modificaciones y nuevas propuestas para el Programa de Visita Escolar Programada (VEP) a través de un aparato especialmente construido con el cual se puede percibir el cielo en una latitud próxima a la de Rio de Janeiro.

Educacion y Ciencias Sociales en el Mundo Moderno. [Education and the Social Sciences in the Modern World].

ERIC Educational Resources Information Center

Rimoldi, Horacio J. A.

The document, written in Spanish, discusses the relationship between research in the social sciences and the role of the university in social science education. The author considers the education of researchers, the application of research, the need for interdisciplinary research methods, and problems involved in cross-cultural studies. He states…

Manual para los Profesores de Ciencias. (Science Teachers' Handbook). Appropriate Technologies for Development Series Reprint R-66.

ERIC Educational Resources Information Center

Rao, C. S., Ed.

Science should not be presented as a collection of facts; it must be presented as an active dynamic subject. It should be used to stimulate young minds and encourage questioning. This is a publication designed to meet the needs of science teachers for a day-to-day reference in science. It was intended for the use of Peace Corps volunteers and…

[Critical reading of reports of educational research in teachers of IMSS. Multicenter study].

PubMed

Leyva-González, Félix Arturo; Cacho-Salazar, Julio M; Degollado-Bardales, Lilia; Zavala-Arenas, Jesús Arturo; Angulo-Bernal, Sonia Elizabeth; Leyva-Salas, César Arturo; Orozco-Bisson, Gisele Victorine

2011-01-01

To determine the effect of an educational strategy promoting participation in the development of critical reading of educational research reports on professors of Educational Research and Teacher Education (CIEFD's). We performed an intervention study, multicenter professors (medical specialists) who enrolled in the courses: Diploma in teaching methodological level 1 and 2 (n = 46, n = 29, respectively) in the six CIEFD's (D.F. Siglo XXI, DF. La Raza, Nuevo León, Sonora, Puebla and Jalisco), in the period March to August 2007. A tool was built that assessed the variables critical appraisal of educational research reports, the construct validity, content and reliability was assessed by experts in education research. The educational strategy developed in the form of seminars, which were held three times a week in the Certification in teaching methodological level 1 and twice per week in the Certification Level 2 in teaching methodology duration per session: 6 h. The instrument was applied at the beginning and end of the course. In the two Graduates it was observed in the total group, an advance in the three indicators of critical reading, which was expressed with statistically significant differences; in the global score of the Diploma level 1 (final vs. initial measurement) the following mediums were observed: 36-67 (p = 0.0001); in the Diploma level 2, it was observed in its overall rating: 42-78 (p = 0.0001). This inquiry from the results observed some of theoretical approaches to mainstreaming participatory. An educational strategy promoting participation produced a breakthrough in the three indicators (to interpret, to judge and to formulate proposals) for critical reading of educational research reports.

Optics outreach activities with elementary school kids from public education in Mexico

NASA Astrophysics Data System (ADS)

Viera-González, P.; Sánchez-Guerrero, G.; Ruiz-Mendoza, J.; Cárdenas-Ortiz, G.; Ceballos-Herrera, D.; Selvas-Aguilar, R.

2014-09-01

This work shows the results obtained from the "O4K" Project supported by International Society for Optics and Photonis (SPIE) and the Universidad Autonoma de Nuevo Leon (UANL) through its SPIE Student Chapter and the Dr. Juan Carlos Ruiz-Mendoza, outreach coordinator of the Facultad de Ciencias Fisico Matematicas of the UANL. Undergraduate and graduate students designed Optics representative activities using easy-access materials that allow the interaction of children with optics over the exploration, observation and experimentation, taking as premise that the best way to learn Science is the interaction with it. Several activities were realized through the 2011-2013 events with 1,600 kids with ages from 10 to 12; the results were analyzed using surveys. One of the principal conclusions is that in most of the cases the children changed their opinions about Sciences in a positive way.

Laboratory preparation questionnaires as a tool for the implementation of the Just in Time Teaching in the Physics I laboratories: Research training

NASA Astrophysics Data System (ADS)

Miranda, David A.; Sanchez, Melba J.; Forero, Oscar M.

2017-06-01

The implementation of the JiTT (Just in Time Teaching) strategy is presented to increase the previous preparation of students enrolled in the subject Physics Laboratory I offered at the Industrial University of Santander (UIS), Colombia. In this study, a laboratory preparation questionnaire (CPL) was applied as a tool for the implementation of JiTT combined with elements of mediated learning. It was found that the CPL allows to improve the students’ experience regarding the preparation of the laboratory and the development of the experimental session. These questionnaires were implemented in an academic manager (Moodle) and a web application (lab.ciencias.uis.edu.co) was used to publish the contents essential for the preparation of the student before each practical session. The most significant result was that the students performed the experimental session with the basic knowledge to improve their learning experience.

PREVENCIÓN DEL VIH/SIDA EN LOS CIRCUITOS DE LEVANTE HSH: UNA ASIGNATURA PENDIENTE1

PubMed Central

Barreda, Victoria; Carballo-Dieguez, Alex; Marone, Rubén; Balán, Iván; Pando, María Ángeles; Ávila, María Mercedes

2011-01-01

Resumen A partir de un relevamiento de tipo etnográfico, se describen lugares de encuentro de HSH en la Ciudad de Buenos Aires y sus prácticas sexuales. El reconocimiento de tales espacios, así como las características que asumen en ellos los encuentros sexuales entre los HSH, plantean obstáculos específicos en la adopción de comportamientos preventivos y, asimismo, generan nuevos desafíos para las actividades de prevención. Se plantean las dificultades y debates conceptuales que la misma categoría presenta, y sus consecuencias en el abordaje preventivo y teórico-metodológico para las ciencias sociales. Además, se proponen nuevos interrogantes acerca de los alcances y las limitaciones del modelo preventivo del VIH/Sida para HSH. PMID:21874154

The prevalence of fluorosis in children is associated with naturally occurring water fluoride concentration in Mexico.

PubMed

Mariño, Rodrigo

2013-09-01

Fluorosis and dental caries in Mexican schoolchildren residing in areas with different water fluoride concentrations and receiving fluoridated salt. Garcia-Perez A, Irigoyen-Carnacho ME, Borges-Yanez A. Caries Res 2013;47(4):299-308. Rodrigo Mariño Is there an association between the presence of dental fluorosis and fluoride concentration in drinking water? and Is there an association between the severity of fluorosis and dental caries experience in schoolchildren residing in two rural towns in Mexico (with water fluoride concentrations of 0.70 and 1.50 ppm) that also receive fluoridated salt? Government: National Council of Science and Technology (Consejo Nacional de Ciencia y Tecnologia, CONACYT) Other: Autonomous University, Xochimilco (Universidad Autonoma Metropolitana, UAM-X) TYPE OF STUDY/DESIGN: Cross-sectional Level 3: Other evidence Not applicable. Copyright © 2013 Elsevier Inc. All rights reserved.

QUEST1 Variability Survey. III. Light Curve Catalog Update

NASA Astrophysics Data System (ADS)

Rengstorf, A. W.; Thompson, D. L.; Mufson, S. L.; Andrews, P.; Honeycutt, R. K.; Vivas, A. K.; Abad, C.; Adams, B.; Bailyn, C.; Baltay, C.; Bongiovanni, A.; Briceño, C.; Bruzual, G.; Coppi, P.; Della Prugna, F.; Emmet, W.; Ferrín, I.; Fuenmayor, F.; Gebhard, M.; Hernández, J.; Magris, G.; Musser, J.; Naranjo, O.; Oemler, A.; Rosenzweig, P.; Sabbey, C. N.; Sánchez, Ge.; Sánchez, Gu.; Schaefer, B.; Schenner, H.; Sinnott, J.; Snyder, J. A.; Sofia, S.; Stock, J.; van Altena, W.

2009-03-01

This paper reports an update to the QUEST1 (QUasar Equatorial Survey Team, Phase 1) Variability Survey (QVS) light curve catalog, which links QVS instrumental magnitude light curves to Sloan Digital Sky Survey (SDSS) objects and photometry. In the time since the original QVS catalog release, the overlap between publicly available SDSS data and QVS data has increased by 8% in sky coverage and 16,728 in number of matched objects. The astrometric matching and the treatment of SDSS masks have been refined for the updated catalog. We report on these improvements and present multiple bandpass light curves, global variability information, and matched SDSS photometry for 214,941 QUEST1 objects. Based on observations obtained at the Llano del Hato National Astronomical Observatory, operated by the Centro de Investigaciones de Astronomía for the Ministerio de Ciencia y Tecnologia of Venezuela.

Atomistic simulation of shocks in single crystal and polycrystalline Ta

NASA Astrophysics Data System (ADS)

Bringa, E. M.; Higginbotham, A.; Park, N.; Tang, Y.; Suggit, M.; Mogni, G.; Ruestes, C. J.; Hawreliak, J.; Erhart, P.; Meyers, M. A.; Wark, J. S.

2011-06-01

Non-equilibrium molecular dynamics (MD) simulations of shocks in Ta single crystals and polycrystals were carried out using up to 360 million atoms. Several EAM and FS type potentials were tested up to 150 GPa, with varying success reproducing the Hugoniot and the behavior of elastic constants under pressure. Phonon modes were studied to exclude possible plasticity nucleation by soft-phonon modes, as observed in MD simulations of Cu crystals. The effect of loading rise time in the resulting microstructure was studied for ramps up to 0.2 ns long. Dislocation activity was not observed in single crystals, unless there were defects acting as dislocation sources above a certain pressure. E.M.B. was funded by CONICET, Agencia Nacional de Ciencia y Tecnología (PICT2008-1325), and a Royal Society International Joint Project award.

Cholecystokinin like immunoreactivity in the brains of young Meishan and Duroc pigs(4).

PubMed

Elmquist, J K; Ross, L R; Hsu, W; Rothschild, M F; Jacobson, C D

1993-01-12

(CCK), un péptido que se encuentra en el sistema digestivo y el cerebro, esta rela-cionado con el control del apetito en varias especies, incluido el cerdo. Las razas chinas como la Meishan se distinguen por su crecimiento lento y deposición de tejido adiposo. En este estudio hemos descrito las concentraciones de sustancias immunoló-gicamente similares a la colecistoquinina (CCK-IR) en tres regiones del cerebro de lechones Duroc y Meishan utilizando radioimmunoensayo. Los cerebros de cerdos de 1, 10 y 20 días de edad de cada raza fueron examinados. La CCK-IR aumentó con la edad en las tres áreas examinadas (córtex, médula e hipotálamo). Las concentraciones en el córtex aumentaron significativamente de 1 a 10 y de 10 a 20 dias de edad. Las concentraciones en el hipotálamo y médula aumentaron significativamente entre los días 1 y 20. No hubo diferencias significativas en CCK-IR entre las razas en ninguna de las edades estudiadas. Nuestros resultados indican que un aumento en CCK-IR en las regiones del cerebro que participan en el control del consumo de alimente podrían ir paralelas a la habilidad de los lechones para asimilar nutrientes de una dieta sólida. 1993 Blackwell Verlag GmbH.

PREFACE: XXXV Symposium on Nuclear Physics

NASA Astrophysics Data System (ADS)

Padilla-Rodal, E.; Bijker, R.

2012-09-01

for Mexican students to present their current research and interact with the visiting scientists. The present volume contains 21 research articles based on invited talks presented at the symposium. We cannot thank enough to all the authors for their enthusiastic contribution, to the anonymous referees for the time they devoted to the review process, which helped us to maintain the high standard of the Conference Proceedings. Finally we would like to thank the International Advisory Committee and the Sponsoring Organizations that made this event possible. E Padilla-Rodal and R Bijker Editors Conference photograph International Advisory Committee Osvaldo Civitarese, Universidad Nacional de La Plata, Argentina Jerry P Draayer, Louisiana State University, USA Alfredo Galindo-Uribarri, Oak Ridge National Laboratory, USA Paulo Gomes, Universidade Federal Fluminense, Brazil Piet Van Isacker, GANIL, France James J Kolata, University of Notre Dame, USA Reiner Krücken, TRIUMF, Canada Jorge López, The University of Texas at El Paso, USA Stuart Pittel, University of Delaware, USA W Michael Snow, Indiana University, USA Adam Szczepaniak, Indiana University, USA Michael Wiescher, University of Notre Dame, USA Organizing Committee Elizabeth Padilla-Rodal (Chair), Instituto de Ciencias Nucleares, UNAM, Mexico Roelof Bijker, Instituto de Ciencias Nucleares, UNAM, Mexico Sponsoring Organizations División de Física Nuclear, SMF Dirección General de Asuntos de Personal Académico, UNAM Centro Latino-Americano de Física Instituto de Ciencias Nucleares, UNAM Instituto de Física, UNAM Instituto Nacional de Investigaciones Nucleares

Sky Observation with the Use of the Software Stellarium for Teaching Astronomy in Classes of Youth and Adult Education. (Spanish Title: Observación del Cielo con la Utilización del Software Stellarium en Las Clases de Educación de Jóvenes y Adultos.) Observação do Céu Aliada À Utilização do Software Stellarium no Ensino de Astronomia em Turmas de Educação de Jovens e Adultos (EJA)

NASA Astrophysics Data System (ADS)

Oliveira Bernardes, Adriana

2010-12-01

The aim of this paper is to present a project developed through a partnership between the Astronomy Club of Itaocara Marcos Pontes (CAIMP) and Jaime de Souza Queiroz College, both located in the town of Itaocara, in the Northwest Fluminense, to disseminate Astronomy in adult education (Education for Youth and Adult). Given the interdisciplinary nature of Astronomy, we have developed this work to motivate the learning of this science by students in adult education, who attend the subjects Chemistry, Physics and Biology. Initially, we conducted a research in the school to assess the prior knowledge of Astronomy class of adult education, noting that there is little knowledge of basic concepts of the discipline. With these data, we were able to elaborate several activities that would enable a greater involvement of students with this science, performing in the school a work of improvement of scientific literacy, whose activities will be presented in this article. El objetivo de este artículo es presentar los resultados de un proyecto realizado por el Club de Astronomía de Itaocara "Marcos Pontes" (CAIMP), conjuntamente con el Colegio Estatal" Jaime de Souza Queiroz", ambos de la ciudad de Itaocara (Noroeste Fluminense - RJ, Brasil), para la difusión de la Astronomía entre los estudiantes, tanto adultos como adolescentes. Teniendo en cuenta la naturaleza interdisciplinaria de la Astronomía, se determinó motivar el estudio de esta ciencia en los estudiantes adultos de nivel secundario matriculados en las asignaturas de Química, Física y Biología. Como primer paso, se investigó el grado de conocimiento sobre astronomía del estudiante. Este estudio inicial mostró niveles de conocimiento muy bajos de los conceptos básicos de esta ciencia, muchos de los cuales deberían haber sido asimilados dentro del plan curricular del curso de Física. Este estudio previo permitió determinar las actividades adecuadas para promover un mayor envolvimiento de los estudiantes

Identifying Bright Stars in Crowded Environments Using Velocity Dispersion Measurements, and an Application to the Center of M32

NASA Astrophysics Data System (ADS)

Davidge, T. J.; Beck, Tracy L.; McGregor, Peter J.

2010-02-01

Facilities Council (UK), the National Research Council of Canada (Canada), CONICYT (Chile), the Australian Research Council (Australia), the Ministerio da Ciencia e Technologia (Brazil), and the Ministerio de Ciencia, Tecnologia e Innovacion Productiva (Argentina).

Educacion en Ciencia, Tecnologia y Sociedad: Teoria y Practica (Education in Science, Technology, and Society: Theory and Practice).

ERIC Educational Resources Information Center

Pena Borrero, Margarita, Ed.

This volume compiles Spanish translations of seven articles on different aspects of Science, Technology and Society Education. The papers, originally written in English, were used during the first in-service training seminar for high school science teachers, which took place in Mayaguez under (Puerto Rico) joint sponsorship of the National…

Viva La Ciencia: Cuba’s Creative Scientists Aim to Make Knowledge Their Country’s Sugar Substitute

NASA Astrophysics Data System (ADS)

Reid, Rosalind; Hayes, Brian

At first, peas served as particles in Ernesto Altshuler's experiment. A mechanical dispenser would drop the chícharos one by one into the space between two glass plates, forming a tidy two-dimensional approximation of a sand pile. Lattice structure appeared, then vanished, as the pile self-organized and went critical—avalanche! But Havana's insects soon found the peas in Altshuler's physics lab. For a physicist working under harsh economic conditions of Cuba in the early 1990s, options were few. Yet Altshuler's solution came as a byproduct of the crisis: Because of fuel shortages, the country had begun importing Chinese bicycles, and ball bearings were available in abundance. Thus the peas have been replaced by steel beads, but Altshuler and his students still call their machine the chícharotron.

The Teletón Centers Of Child Rehabilitation Mexico: 'El amor y la ciencia al servicio del hombre'.

PubMed

Carbajal, Alejandro Parodi

2008-07-01

This paper describes the foundation and distribution of the Teleton and Oritel networks of rehabilitation. An essential component of the Pan-American network, as reported by Dr. Jorge Hernandez Franco, Teleton follows a humanistic perspective in offering a comprehensive biopsychosocial model of therapy and care. Public engagement is central to the success of Teleton and highlights the importance of increasing public understanding of rehabilitation needs and service delivery.

Buoyancy and blockage effects on transient laminar opposing mixed convection heat transfer from two horizontal confined isothermal cylinder in tandem

NASA Astrophysics Data System (ADS)

Martínez-Suástegui, Lorenzo; Salcedo, Erick; Cajas, Juan; Treviño, César

2015-11-01

Transient mixed convection in a laminar cross-flow from two isothermal cylinders in tandem arrangement confined inside a vertical channel is studied numerically using the vorticity-stream function formulation of the unsteady two-dimensional Navier-Stokes and energy equations. Numerical experiments are performed for a Reynolds number based on cylinder diameter of Re = 200, Prandtl number of Pr = 7, blockage ratio of D/H = 0.2, a pitch-to-diameter ratio of L/D = 2, and several values of buoyancy strength or Richardson number Ri = Gr/Re2. The results reported herein demonstrate how the wall confinement, interference effects and opposing buoyancy affect the flow structure and heat transfer characteristics of the cylinder array. This research was supported by the Consejo Nacional de Ciencia y Tecnología (CONACYT), Grant number 167474 and by the Secretaría de Investigación y Posgrado del IPN, Grant number SIP 20141309.

Influence of thermal light correlations on photosynthetic structures

NASA Astrophysics Data System (ADS)

de Mendoza, Adriana; Manrique, Pedro; Caycedo-Soler, Felipe; Johnson, Neil F.; Rodríguez, Ferney J.; Quiroga, Luis

2014-03-01

The thermal light from the sun is characterized by both classical and quantum mechanical correlations. These correlations have left a fingerprint on the natural harvesting structures developed through five billion years of evolutionary pressure, specially in photosynthetic organisms. In this work, based upon previous extensive studies of spatio-temporal correlations of light fields, we hypothesize that structures involving photosensitive pigments like those present in purple bacteria vesicles emerge as an evolutionary response to the different properties of incident light. By using burstiness and memory as measures that quantify higher moments of the photon arrival statistics, we generate photon-time traces. They are used to simulate absorption on detectors spatially extended over regions comparable to these light fields coherence length. Finally, we provide some insights into the connection between these photo-statistical features with the photosynthetic membrane architecture and the lights' spatial correlation. Facultad de Ciencias Uniandes.

Clinical heterogeneity in autoimmune acute liver failure

PubMed Central

Chavez-Tapia, Norberto C; Martinez-Salgado, Julio; Granados, Julio; Uribe, Misael; Tellez-Avila, Felix I

2007-01-01

AIM: To describe the outcome and prognosis in a cohort of patients with acute liver failure due to autoimmune hepatitis without liver transplantation. METHODS: A retrospective trial was conducted in 11 patients with acute liver failure due to autoimmune hepatitis who attended the Instituto Nacional de Ciencias Médicas y Nutrición Salvador Zubiran. Demographic, biochemical and severity indexes, and treatment and outcome were assessed. RESULTS: Among the 11 patients, with a median age of 31 years, 72% had inflammatory response syndrome, and six patients received corticosteroids. The mortality rate within four weeks was 56%, and the one-year survival was 27%. In the survivors, severity indexes were lower and 83% received corticosteroids. CONCLUSION: We observed a relatively high survival rate in patients with acute liver failure due to autoimmune hepatitis. This survival rate could be influenced by severity of the disease and/or use of corticosteroids. PMID:17465474

Exciton absorption of entangled photons in semiconductor quantum wells

NASA Astrophysics Data System (ADS)

Rodriguez, Ferney; Guzman, David; Salazar, Luis; Quiroga, Luis; Condensed Matter Physics Group Team

2013-03-01

The dependence of the excitonic two-photon absorption on the quantum correlations (entanglement) of exciting biphotons by a semiconductor quantum well is studied. We show that entangled photon absorption can display very unusual features depending on space-time-polarization biphoton parameters and absorber density of states for both bound exciton states as well as for unbound electron-hole pairs. We report on the connection between biphoton entanglement, as quantified by the Schmidt number, and absorption by a semiconductor quantum well. Comparison between frequency-anti-correlated, unentangled and frequency-correlated biphoton absorption is addressed. We found that exciton oscillator strengths are highly increased when photons arrive almost simultaneously in an entangled state. Two-photon-absorption becomes a highly sensitive probe of photon quantum correlations when narrow semiconductor quantum wells are used as two-photon absorbers. Research funds from Facultad de Ciencias, Universidad de los Andes

Sobre la terapia génica para enfermedades de la retina.

PubMed

Fischer, M Dominik

2017-07-11

Las mutaciones en un gran número de genes provocan degeneración de la retina y ceguera sin que exista actualmente cura alguna. En las últimas décadas, la terapia génica para enfermedades de la retina ha evolucionado y se ha convertido en un nuevo y prometedor paradigma terapéutico para estas enfermedades poco comunes. Este artículo refleja las ideas y los conceptos que parten de la ciencia básica hacia la aplicabilidad de la terapia génica en el ámbito clínico. Se describen los avances y las reflexiones actuales sobre la eficacia de los ensayos clínicos en la actualidad y se discuten los posibles obstáculos y soluciones de cara al futuro de la terapia génica para enfermedades de la retina. © 2017 S. Karger AG, Basel.

Disinfection of Contaminated Water by Using Solar Irradiation

PubMed Central

Caslake, Laurie F.; Connolly, Daniel J.; Menon, Vilas; Duncanson, Catriona M.; Rojas, Ricardo; Tavakoli, Javad

2004-01-01

Contaminated water causes an estimated 6 to 60 billion cases of gastrointestinal illness annually. The majority of these cases occur in rural areas of developing nations where the water supply remains polluted and adequate sanitation is unavailable. A portable, low-cost, and low-maintenance solar unit to disinfect unpotable water has been designed and tested. The solar disinfection unit was tested with both river water and partially processed water from two wastewater treatment plants. In less than 30 min in midday sunlight, the unit eradicated more than 4 log10 U (99.99%) of bacteria contained in highly contaminated water samples. The solar disinfection unit has been field tested by Centro Panamericano de Ingenieria Sanitaria y Ciencias del Ambiente in Lima, Peru. At moderate light intensity, the solar disinfection unit was capable of reducing the bacterial load in a controlled contaminated water sample by 4 log10 U and disinfected approximately 1 liter of water in 30 min. PMID:14766599

Velocity profile of water vapor inside a cavity with two axial inlets and two outlets

NASA Astrophysics Data System (ADS)

Guadarrama-Cetina, José; Ruiz Chavarría, Gerardo

2014-03-01

To study the dynamics of Breath Figure phenomenon, a control of both the rate of flow and temperature of water vapor is required. The experimental setup widely used is a non hermetically closed chamber with cylindrical geometry and axial inlets and outlets. In this work we present measurements in a cylindrical chamber with diameter 10 cm and 1.5 cm height, keeping a constant temperature (10 °C). We are focused in the velocity field when a gradient of the temperatures is produced between the base plate and the vapor. With a flux of water vapor of 250 mil/min at room temperature (21 °C), the Reynolds number measured in one inlet is 755. Otherwise, the temperatures of water vapor varies from 21 to 40 °C. The velocity profile is obtained by hot wire anemometry. We identify the stagnations and the possibly instabilities regions for an empty plate and with a well defined shape obstacle as a fashion sample. Facultad de Ciencias, UNAM.

An occurence records database of Irregular Echinoids (Echinodermata: Echinoidea) in Mexico.

PubMed

Martínez-Melo, Alejandra; Solís-Marín, Francisco Alonso; Buitrón-Sánchez, Blanca Estela; Laguarda-Figueras, Alfredo

2016-01-01

Research on echinoderms in Mexico began in the late nineteenth century. We present a dataset that includes the taxonomic and geographic information of irregular echinoids from Mexico, housed in four collections: 1) Colección Nacional de Equinodermos "Ma. Elena Caso Muñoz" from the Instituto de Ciencias del Mar y Limnología (ICML), Universidad Nacional Autónoma de México (UNAM); 2) Invertebrate Zoology Collection, Smithsonian Museum of Natural History, Washington, D.C., United States of America (USA); 3) Invertebrate Collection, Museum of Comparative Zoology, University of Harvard, Boston, Massachusetts, USA and 4) Invertebrate Zoology, Peabody Museum, Yale University, New Haven, Connecticut, USA. A total of six orders, 17 families, 35 genera and 68 species are reported, 37 distributed in the Pacific coast and 31 in the Atlantic coast, none of them was found in both coasts. The most diverse region is the Gulf of California (S=32); the most diverse order is Spatangoida with 31 species reported in mexican waters.

Effect of Seeding Particles on the Shock Structure of a Supersonic Jet

NASA Astrophysics Data System (ADS)

Porta, David; Echeverría, Carlos; Stern, Catalina

2012-11-01

The original goal of our work was to measure. With PIV, the velocity field of a supersonic flow produced by the discharge of air through a 4mm cylindrical nozzle. The results were superposed to a shadowgraph and combined with previous density measurements made with a Rayleigh scattering technique. The idea was to see if there were any changes in the flow field, close to the high density areas near the shocks. Shadowgraphs were made with and without seeding particles, (spheres of titanium dioxide). Surprisingly, it was observed that the flow structure with particles was shifted in the direction opposite to the flow with respect to the flow structure obtained without seeds. This result might contradict the belief that the seeding particles do not affect the flow and that the speed of the seeds correspond to the local speed of the flow. We acknowledge support from DGAPA UNAM through project IN117712 and from Facultad de Ciencias UNAM.

Proximity effect in superconductor/ferromagnet hetero-structures as a function of interface properties

NASA Astrophysics Data System (ADS)

Sarmiento, Julio; Patino, Edgar J.

2014-03-01

Superconductor/ferromagnet heterostructures are currently a subject of strong research due to novel phenomena resulting from the proximity effect. Among the most investigated ones are the oscillations of the critical temperature as function of the ferromagnet thickness. The oscillatory behavior of Tc is theoretically explained as to be result of the generation of the FFLO (Fulde-Ferrel-Larkin-Ovchinnikov) state of Cooper pairs under the presence of the exchange field of the ferromagnet. With the advancement of experimental techniques for S/F bilayers growth new questions regarding the effect of the interface transparency can to be addressed. For instance the influence of the interface roughness on the proximity effect. For studying this phenomenon Nb/Co and Nb/Cu/Co samples were sputtered on SiO2 substrates with different roughness. Characterization of these samples show a significant variation of Tc with the interface roughness. This results point towards a possible relationship between transparency and roughness of the interface. Proyecto Semilla Facultad de Ciencias Universidad de los Andes.

"Optics 4 every1", the hands-on optics outreach program of the Universidad Autonoma de Nuevo Leon

NASA Astrophysics Data System (ADS)

Viera-González, Perla M.; Sánchez-Guerrero, Guillermo E.

2016-09-01

The Fisica Pato2 (Physics 4 every1) outreach group started as a need of hands-on activities and active Science demonstrations in the education for kids, teenagers and basic education teachers in Nuevo Leffon maintaining a main objective of spread the word about the importance of Optics and Photonics; for accomplish this objective, since November 2013 several outreach events are organized every year by the group. The program Optics 4 every1 is supported by the Facultad de Ciencias Fisico Matematicas of the Universidad Autonoma de Nuevo Leon and the International Society for Optics and Photonics and consist in quick hands-on activities and Optics demonstrations designed for teach basic optical phenomena related with light and its application in everyday life. During 2015, with the purpose of celebrate the International Year of Light 2015, the outreach group was involved in 13 different events and reached more than 8,000 people. The present work explains the activities done and the outcome obtained with this program.

Interleukin 27 is up-regulated in patients with active inflammatory bowel disease.

PubMed

Furuzawa Carballeda, Janette; Fonseca Camarillo, Gabriela; Yamamoto-Furusho, Jesús K

2016-08-01

The aim of the study was to characterize and quantify tissue gene and protein expression of IL-27 in ulcerative colitis (UC) and Crohn's disease (CD) patients. This is an observational and cross-sectional study. Fifty-four patients with IBD were studied: 27 active UC, 12 inactive UC, 10 active CD, and 5 inactive CD. All patients belonged to the Inflammatory Bowel Disease Clinic at the Instituto Nacional de Ciencias Médicas y Nutrición. We found that IL-27 gene expression was significantly higher in active UC versus inactive UC group (P = 0.015). The IL-27 mRNA expression was increased in patients with active CD compared with inactive CD disease (P = 0.035). The percentage of IL-27 immunoreactive cells was higher in active UC versus active CD patients and non-inflamed tissue controls. The IL-27 was significantly elevated in active UC and CD patients, and it was associated with disease severity.

[Psychosocial factors associated with late HAART initiation in Mexican patients with HIV].

PubMed

Nogueda-Orozco, María José; Caro-Vega, Yanink; Crabtree-Ramírez, Brenda; Vázquez-Pineda, Fernando; Sierra-Madero, Juan G

2015-01-01

To explore the association between psychosocial factors and late highly active antiretroviral therapy (HAART) initiation in a sample of Mexican patients with HIV. We conducted a cross-sectional study at the HIV Clinic of the Instituto Nacional de Ciencias Médicas y Nutrición Salvador Zubirán (INCMNSZ), and applied structured questionnaires to 150 patients who initiated HAART between January 2010 and August 2011. Late HAART initiation (LHI) was considered when patients started HAART with CD4 counts of <200+ cells/mm³. By multivariate analysis, the strongest psychosocial risk factor for LHI observed was self-stigma towards HIV/AIDS. In addition, being tested by medical prescription, not by own initiative, as well as having one or more previous medical contacts, were associated with greater risk for LH. Our findings suggest the need to develop psychosocial interventions to decrease negative self-image and stigmatizing attitudes and behaviors in risk groups for HIV in Mexico.

[Analysis of the continuity, circulation and productivity of the Revista Española de Quimioterapia].

PubMed

Gimeno Sieres, E

2007-06-01

The primary objective of this study was to compare some of the bibliometric indicators of the continuity, circulation and productivity of the Revista Espanola de Quimioterapia up to 2003 with other spanish journals of Pharmacy and Pharmacology. This was done by reviewing periodicals directories, such as the ISSN (International Standard Serial Number/Número Internacional Normalizado de Publicaciones Seriadas) and ULRICH'S (Periodicals Directory), as well as the CDU (Classification Universal Decimal), national and international databases including IME (Indice Médico Español), ICYT (Indice Espanol de Ciencia y Tecnologia), IPA (International Pharmaceutical Abstracts), SCI Expanded (Science Citation Index Expanded), MEDLINE (Index Medicus), EMBASE (Excerpta Medica), BIOSIS PREVIEWS, ANALYTICAL ABSTRACTS, FSTA (Food Science and Technology Abstracts), SCIFINDER SCHOLAR and CHEMISTRY CITATION INDEX. According to the results, the Revista Española de Quimioterapia, in publication for 15 years, is widely distributed and has a good rating among other scientific journals of the same discipline.

Photon-Assisted Resonant Tunneling and 2-D Plasmon Modes in Double Quantum Wells in Intense Terahertz Electric Fields

NASA Astrophysics Data System (ADS)

Peralta, X. G.; Allen, S. J.; Lin, S. Y.; Simmons, J. A.; Blount, M. A.; Baca, W. E.

1998-03-01

We explore photon-assisted resonant tunneling in double quantum well systems in intense terahertz electric fields that have separately- contacted wells. We have two goals in mind: 1) increase the basic understanding of photon assisted tunneling in semiconductors and 2) assess the potential of this structure as a detector. We can control the tunneling current by varying the electron density of each 2D electron gas or by changing the relative separation of the Fermi levels. This allows us to prepare the system in such a way that photons of the appropriate energy may induce resonant tunneling, which is monitored by a change in conductance. We also examine the possible enhancement of the resonant tunneling by resonant excitations of acoustic plasmon modes. This work is supported by ONR, the U. S. Dept. of Energy under Contract DE-AC04-94AL85000 and Consejo Nacional de Ciencia y Tecnología, México.

The effect of the magnetic topology of the Magnetic Clouds over the Solar Energetic Particle Events

NASA Astrophysics Data System (ADS)

Medina, J.; Hidalgo, M.; Blanco, J.; Rodriguez-Pacheco, J.

2007-12-01

We have simulated the effect of the magnetic topology of the Magnetic Clouds (MCs) over the solar energetic particle event (SEPe) fluxes (0.5-100 MeV) provided by solar flares. When a SEPe passes through a MC a characteristic behaviour in the data corresponding to the ion and electron fluxes is observed: a depression after a strong maximum of the flux. Using our cross-section circular and elliptical MC models we have tried to explain that effect, understanding the importance of the topology of the MC. In sight of the results of the preliminary analysis we conclude that the magnitude of the magnetic field seems not to play a significant role but the helicoidal topology associated with topology of the MCs. This work has been supported by the Spanish Comisión Internacional de Ciencia y Tecnologia (CICYT), grant ESP2005-07290-C02-01 and ESP2006-08459. This work is performed inside COST Action 724.

Linear polarization of a group of symbiotic systems

NASA Astrophysics Data System (ADS)

Brandi, E.; García, L. G.; Piirola, V.; Scaltriti, F.; Quiroga, C.

2000-08-01

We report linear polarization measurements of a set of symbiotic stars, made at several epochs during the period 1994-1998. Evidence of intrinsic polarization is looked for from the wavelength dependence of the polarization degree and position angle in UBVRI bands. The results have also been analysed to search for temporal variability of polarization. Several objects have shown a polarization spectrum different from that produced by interstellar dust grains and/or polarimetric variations on time scales as short as several days or months, indicating the presence of polarization component of circumstellar origin. Based on observations taken at Complejo Astronómico El Leoncito (CASLEO), operated under an agreement between the Consejo Nacional de Investigaciones Científicas y Técnicas de la República Argentina, the Secretaría de Ciencia y Tecnología de la Nación and the National Universities of La Plata, Córdoba and San Juan.

Following the geomagnetic activity: events on September and October (1999)

NASA Astrophysics Data System (ADS)

Blanco, J. J.; Hidalgo, M. A.; Rodríguez-Pacheco, J.; Medina, J.; Sequeiros, J.; Nieves-Chinchilla, T.

2006-12-01

On 21-22 October 1999 a very intense geomagnetic storm (DST index: -237 nT) was detected. This event was associated with a High Speed Stream (HSS) and an interplanetary coronal mass ejection. Before and after this event, the interplanetary magnetic field showed an inversion probably associated with Heliospheric Current Sheet (HCS) crossings. One month before (21-22 September) a strong geomagnetic storm (DST index: -164 nT) was detected and the solar wind conditions were similar to those observed in October, i. e. magnetic cloud, HSS and HCS crossings. Nevertheless, the October event was stronger than the September one. We have compared both events trying to clarify what caused the difference between them. This work has been supported by the Spanish Comisión Internacional de Ciencia y Tecnología (CICYT), grant ESP2005-07290-C02-01 and ESP2006-08459 and Madrid Autonomous Community / University of Alcala grant CAM-UAH 2005/007.

Disinfection of contaminated water by using solar irradiation.

PubMed

Caslake, Laurie F; Connolly, Daniel J; Menon, Vilas; Duncanson, Catriona M; Rojas, Ricardo; Tavakoli, Javad

2004-02-01

Contaminated water causes an estimated 6 to 60 billion cases of gastrointestinal illness annually. The majority of these cases occur in rural areas of developing nations where the water supply remains polluted and adequate sanitation is unavailable. A portable, low-cost, and low-maintenance solar unit to disinfect unpotable water has been designed and tested. The solar disinfection unit was tested with both river water and partially processed water from two wastewater treatment plants. In less than 30 min in midday sunlight, the unit eradicated more than 4 log10 U (99.99%) of bacteria contained in highly contaminated water samples. The solar disinfection unit has been field tested by Centro Panamericano de Ingenieria Sanitaria y Ciencias del Ambiente in Lima, Peru. At moderate light intensity, the solar disinfection unit was capable of reducing the bacterial load in a controlled contaminated water sample by 4 log10 U and disinfected approximately 1 liter of water in 30 min.

Confieso que Divulgo. Reflexiones y Experiencias de una Astrofísica

NASA Astrophysics Data System (ADS)

Rodríguez Hidalgo, I.

Este artículo presenta algunas reflexiones en torno a la popularización de la Ciencia, desarrolladas a lo largo de mi trayectoria profesional, un camino inacabado desde la intuición al oficio. Tras revisar las señas de identidad de la divulgación científica, se exponen ideas, experiencias y recursos, cribados por la práctica y su posterior análisis crítico. Se destacan las actividades relacionadas con la Astronomía, que se cuentan entre las más espectaculares y gratificantes. Confessions of a popularizer: This paper presents some author's thoughts about scientific outreach, developed along her professional path, an unfinished way from intuition to trade. First, identity signs of outreach are revised; then, ideas, experiences and resources, sifted by practice and further critical analysis, are reviewed. Activities related to Astronomy, being one of the most spectacular and rewarding, are remarked 1

[Educational practices for diabetes mellitus: integrative literature review].

PubMed

Borba, Anna Karla de Oliveira Tito; Marques, Ana Paula de Oliveira; Leal, Márcia Carréra Campos; Ramos, Roberta Souza Pereira da Silva

2012-03-01

This is an integrative literature review which aims to identify the multi-professional scientific production on educational practices for individuals with diabetes available in the databases: Latin American Literature in Health Sciences (Literatura Latino Americana em Ciências da Saúde-LILACS), Medical Literature and Retrieval System online (Medline), Spanish Bibliographical Index in Health Sciences (Indice Bibliográfico Español en Ciencias de la Salud-Ibecs) and the Database on Nursing (Base de Dados em Enfermagem-BDENF), from 1999 to 2009. Results show that educational practices are developed mainly for adults and seniors up to 80 years of age, and involve themes that reflect the daily ife of living with diabetes. These practices are spread mainly through groups, bringing benefits not only for the individual with diabetes but also for the healthcare professional. Thus, we can see the process of changing the traditional education paradigm to a problem-based dialogical education, with a view for promoting health.

Strategies, Programs and Projects 2008 of the Astrophysical Group "SPACE-Universidad Nacional Mayor De San Marcos, Peru" - Preparing for the IYA2009

NASA Astrophysics Data System (ADS)

Vera, Victor; Aguilar, M.; Huisacayna, J.

2008-05-01

We present a review of our efforts to introduce astronomy as scientific career in Peru, showing how our astronomy outreach programs have been one of the most important keys to reach our national astronomical scientific goals, remarking the crucial role that the celebration of the IYA2009 must play, in order to promote PhD programmes in astronomy in developing countries. We show the importance of the creation of the Seminario Permanente de Astronomía y Ciencias Espaciales (SPACE) in the Universidad Nacional Mayor de San Marcos, as an academic scientific and cultural center in Peru, to support our 26 years-old "Astronomical Fridays” which are addressed to wide range of public, from schoolchildren to scientists. We also show how important was to rediscover our ancient astronomical cultural past of Incas in order to promote the construction of a Astronomical Center located near Cusco city over 4000 meters above sea level, which includes a tourist-educational observatory, a scientific optical observatory and a solar radio observatory.

Electronic properties of carbon in the fcc phase.

NASA Astrophysics Data System (ADS)

Cab, Cesar; Canto, Gabriel

2005-03-01

The observation of a new carbon phase in nanoparticles obtained from Mexican crude oil having the face-centered-cubic structure (fcc) has been reported. However, more recently has been suggested that hydrogen is present in the samples forming CH with the zincblende structure. The structural and electronic properties of C(fcc) and CH(zincblende) are unknown. In the present work we have studied the electronic structure of C(fcc) and CH(zincblende) by means of first-principles total-energy calculations. The results were obtained with the pseudopotentials LCAO method (SIESTA code) and the Generalized Gradient Approximation (GGA) for the exchange-correlation potential. We have analyzed the band structure, the local density of states (LDOS), and orbital population. We find that in contrast to graphite and diamond, both fcc carbon and CH with the zincblende structure exhibit metallic behavior. This research was supported by Consejo Nacional de Ciencia y Tecnolog'ia (Conacyt-M'exico) under Grants No. 43830-F, No. 44831-F, and No. 43828-Y.

Electronic structure and bonding properties of potassium (K) on graphite under external electric field.

NASA Astrophysics Data System (ADS)

Tapia, Alejandro; Canto, Gabriel

2005-03-01

The effect of an external electric field on the potassium (K) adsorption on the graphite surface, are studied by means of first-principles total-energy calculations. The results were obtained with the pseudopotentials LCAO method (SIESTA code) and the Generalized Gradient Approximation (GGA) for the exchange-correlation potential. The structural parameters, bonding properties, and electronic structure of the K-graphite system are studied in the triangular (2x2) overlayer phase as a function of the external electric field magnitude. We find an important change in the K-graphite bonding as a consequence of the charge transfer from the adatom towards the substrate induced by the electric field. The results are discussed in the light of the experimental observed difussion of K into graphite induced by external electric fields. This work was supported by Consejo Nacional de Ciencia y Tecnolog'ia (CONACYT, M'exico) under Grants No. 43830-F and No. 44831-F.

Effect of pressure on the tetragonal distortion in TiH2: a first-principles study

NASA Astrophysics Data System (ADS)

de Coss, R.; Quijano, R.; Singh, D. J.

2009-03-01

The transition metal dihydride TiH2 present the fluorite structure (CaF2) at high temperature but undergoes a tetragonal distortion with c/a<1 at low temperature. Early electronic band structure calculations have shown that TiH2 in the cubic phase display a nearly flat double degenerated band at the Fermi level. Thus the low temperature tetragonal distortion has been associated to a Jahn-Teller effect. Nevertheless, recently we have show that the instability of fcc-TiH2 is likely to be related with a van Hove singularity. In the present work, we have performed ab-initio calculations of the electronic structure and the tetragonal distortion for TiH2 under pressure (0-30 GPa). We found that the fcc-fct energy barrier and the tetragonal distortion increases with pressure. The evolution of the tetragonal distortion is analyzed in terms of the electronic band structure. This research was supported by Consejo Nacional de Ciencia y Tecnolog'ia (Conacyt) under Grant No. 49985.

Absence of metastable states in strained monoatomic cubic crystals.

NASA Astrophysics Data System (ADS)

Aguayo, Aarón; Mehl, Michael L.; de Coss, Romeo

2005-03-01

The Bain path distortion of a metal with an fcc (bcc) ground state toward the bcc (fcc) structure initially requires an increase in energy, but at some point along the Bain path the energy will again decrease until a local minimum is reached. We have studied the tetragonal distortion (Bain path) of monoatomic cubic crystals, using a combination of parametrized tight-binding and first-principles linearized augmented plane wave calculations. We show that this local minimum is unstable with respect to an elastic distortion, except in the rare case that the minimum is at the bcc (fcc) point on the Bain path. This shows that body-centered-tetragonal phases of these materials, which have been seen in epitaxially grown thin films, must be stabilized by the substrate and cannot be freestanding films. This work was partially supported by Consejo Nacional de Ciencia y Tecnolog'ia (CONACYT, M'exico) under Grant No. 43830-F.

Compartiendo la Ciencia con los Ninos: Una Guia para los Padres (Sharing Science with Children: A Guide for Parents).

ERIC Educational Resources Information Center

North Carolina Museum of Life and Science, Durham.

This guide offers Spanish-speaking parents ways in which they can help their children learn about science at home and in the community. Science is a way of looking at the world. It uses everyday techniques such as observation and classification to give us information about things and how they work. Advice to parents that want to support their…

Different Cultures in Astronomy Education and Their Meanings in the Classroom. (Spanish Title: Las Diferentes Culturas en la Educación en Astronomía y Sus Significados EN EL Aula. ) As Diferentes Culturas na Educação em Astronomia E Seus Significados em Sala de Aula

NASA Astrophysics Data System (ADS)

Pereira de Barros, Vicente; Bovolenta Ovigli, Daniel Fernando

2014-12-01

This paper is a reflection about the use of History of Science in the curriculum of formal education, through the discussion concerning cultural elements of several ethnic groups in Brazil, in actions related to astronomy education. The work was developed in the framework of an extension course and the analysis undertaken here refers to a meeting that discussed didactic sequences relating to that theme, based on the Brazilian law 11.645/2008, which states the obligation to present the subject "African-brazilian and indigenous History and Culture" in the official curriculum. The extension action was developed with teachers who teach Natural Sciences, in São Paulo state, discussing issues related to the use of History of Science and the relationship with cosmogonies from Iorubá and Tupi peoples, highlighting how they can enhance the work with Astronomy(ies) in the classroom. It was observed that the participants had not yet presented these themes in their classes and also did not participate in training courses that discussed these subjects. Este artículo presenta una reflexión sobre el uso de la historia de la ciencia en el currículo de la educación formal, a través de la discusión sobre el uso de los elementos culturales de los grupos étnicos en Brasil, en acciones relacionadas con la educación en astronomía. El trabajo se desarrolló en el marco de un curso de extensión y el análisis realizado aquí se refiere a un encuentro en el cual se abordaron secuencias didácticas relacionadas con ese tema, sobre la base de la ley brasilera 11.645/2008 que dispone la obligatoriedad del tema "Historia y Cultura africana e indígena en el Brasil" en el currículo oficial. La acción de extensión se desarrolló con los profesores de ciencias naturales en el interior del estado de São Paulo, discutiendo temas relacionados con el uso de la historia de la ciencia y la relación con las cosmogonías de los pueblos Iorubá y Tupi, que muestra cómo se puede mejorar

List of Participants

NASA Astrophysics Data System (ADS)

2011-08-01

Abigail Alvarez OlarteCINVESTAV Alba Leticia Carrillo MonteverdeDCI-UG Alberto CarramiñanaINAOE Aldo MorselliFERMI Alejandro CastillaDCI-UG Alejandro IbarraTechnical University of Munich Alma D Rojas PachecoFCFM-BUAP Alma Xochitl Gonzalez MoralesInstituto de Ciencias Nucleares, UNAM Andrew Walcott BeckwithAmerican Institute of Beam Energy Physics Ariadna Montiel ArenasDepartamento de Física, CINVESTAV Arnulfo ZepedaCinvestav Arturo Alvarez CruzInstituto de Fisica, UNAM Axel de la MacorraUNAM, IAC Azar MustafayevUniversity of Minnesota Benjamin JaramilloDCI-UG Vincent BertinCPPM-Marseille Carlos Alberto Vaquera-AraujoDCI-UG Carlos MuñozMadrid Autonoma U. & Madrid, IFT Carmine PagliaroneINFN, FNAL Carolina Lujan PeschardDCI-UG Christiane Frigerio MartinsUniversidade Federal do ABC-São Paulo Csaba BalazsMonash University David DelepineDCI-UG David G CerdenoUniversidad Autonoma de Madrid & Instituto de Fisica Teorica Debasish MajumdarSaha Institute of Nuclear Physics, Kolkata, India Dibyendu PanigrahiKandi Raj College, Kandi, Murshidabad, INDIA-742137 Dupret Alberto Santana BejaranoUniversidad de Sonora Departamento de Investigacion en Fisica Ernest MaRiverside U.C. Esteban Alejandro Reyes Pírez MontañezInstituto de Física, UNAM Federico Ortiz TrejoINSTITUTO DE ASTRONOMÍA - UNAM Francisco José de Anda NavarroUniversidad de Guadalajara González Alvarez Francisco JavierCINVESTAV-Depto. Física Gustavo Medina TancoICN-UNAM Hernando Efrain Caicedo OrtizInstituto Politecnico Nacional - IPN J D VergadosCERN & Ioannina U. James R BoyceJefferson Lab Jason SteffenFERMILAB Javier Montaño DomínguezDCI-UG Jeevan SolankiMandsaur Institue of Technology MP India Joe SatoSaitama University Jorge Luis Navarro EstradaUNAM-ICN and Universidad del Atlantico (B/quilla-Col.) Jose A R CembranosUniversity of Minnesota José DíazIFIC Jose Didino Garcia AguilarDepto. de Fisica. Cinvestav Keith OliveUniversity of Minnesota Konstantia BalasiUniversity of Ioannina, Greece Lilian Prado

Astrophysics in Schools: Playing with Observational Data. (Spanish Title: Astrofísica Escolar: Jugando con Datos Observacionales.) Astrofísica Escolar: Brincando com Dados Observacionais

NASA Astrophysics Data System (ADS)

Navone, Hugo D.; Scancich, Miriam; Vázquez, Rubén A.

2011-07-01

The use of observational records in the design of teaching sequences in Astrophysics in High Schools is quite uncommon. It is also uncommon the thematic approach within the context provided by Nature of Science. Besides these shortcomings, we should also consider the lack of proposals to use the computer as a laboratory from which nature is studied. These aspects expose the existence of a disconnection between school science and scientist's science, establishing the need for simple educational projects that promote interdisciplinary dialogue between the two fields of knowledge. Based on these assumptions, this paper presents the school reformulation of the redshift-distance problem as addressed by Hubble in his diagram, and explores the main educational dimensions emerging from it. The proposal is directed not only for senior students of high school and/or early 1st year students at University level, but also for students and teachers from teacher training colleges. Practical evidence shows that this proposal is viable, mobilizes interests about issues of Astrophysics and promotes a ludic and cooperative character among students. La utilización de registros observacionales en el diseño de secuencias didácticas en Astrofísica Escolar no es algo usual en el ámbito de la escuela media. Tampoco lo es el abordaje de temáticas desde el contexto que provee Naturaleza de la Ciencia. A estas carencias se le suma la falta de propuestas que hagan intervenir a la computadora como un laboratorio desde el cual se interpela a la naturaleza. Los aspectos mencionados exponen la existencia de un desajuste entre ciencia escolar y ciencia experta estableciendo la necesidad de elaborar proyectos educativos sencillos que promuevan el diálogo interdisciplinar entre ambos campos del conocimiento. Partiendo de estos presupuestos, en este trabajo se presenta la reformulación escolar del problema abordado por Hubble -que diera lugar al diagrama que lleva su nombre- y se exploran las

A catalog of the types of Staphylinidae (Insecta, Coleoptera) deposited in the Museo Argentino de Ciencias Naturales, Buenos Aires (MACN).

PubMed

Bachmann, Axel O; Chani-Posse, Mariana; Guala, Mariel E; Newton, Alfred F

2017-01-22

The type specimens (all current categories) of Staphylinidae deposited in this Museum are listed; names are recorded, most of them represented by name-bearing types (primary types). The specific and subspecific names are alphabetically ordered in a single list, followed by the generic names (and subgeneric ones, if they were stated) spelled as they were published; later combinations and/ or current binomina are mentioned insofar these are known to the authors. Two lists are added: 2. Specimens labeled as types of names not found in the literature and probably never published, or published as nomina nuda; and 3. Specimens labeled as types, but not originally designated as such. An appendix provides a systematically arranged list of all names discussed, with indication of where they are discussed in the text.

Reproductive and some peri-natal variables in a mixed breed beef cattle herd.

PubMed

Ponzoni, R W; Gifford, D R

1994-01-12

ährend Korrelationen zwischen DC und Funktionen von DC auch nahe 1 waren. Die Korrelationen von DC mit BW und CE schwankten wenig nach den verschiedenen Transformationen und bewegten sich zwischen 0,26 und 0,28 sowie 0,10 und 0,12. Die Korrelation zwischen BW und CE war 0,06. Die Untersuchung weist auf eine Reihe von Problemen, die sich durch die Verwendung von DC als Reproduktionsvariable von Fleischrindern ergeben. Es wird der Schluß gezogen, daß DC derzeit zwar nützliche Information für die Praxis ist, daß aber das Suchen nach wissenschaftlich angemessenen weiblichen Reproduktionsmerkmalen fortgesetzt werden sollte. RESUMEN: Variables reproductivas y peri-natales en un rodeo de vacunos de carne de varias razas Las variables éxito al parto (CS), dias al parto (DC), peso al nacer (BW) y facilidad de parto (CE) se estudiaron en un rodeo de vacunos de carne compuesto de varias razas (Hereford, Jersey × Hereford y Simmental × Hereford). DC no estaba normalmente distribuida y una serie de transformaciones ensayadas fracasaron en normalizar esta variable. Las repetibilidades se estimaron por análisis de variancia. La inclusión (o exclusión) de las vacas falladas (no paridas) del análisis y las transformaciones estudiadas tuvieron poco efecto en la repetibilidad de DC, que varió de 0.10 a 0.12. Las repetibilidades de CS, BW y CE fueron 0.08, 0.26 y 0.03, respectivamente. Las correlaciones residuales de CS con DC y con funciones de DC fueron altas (valor absoluto 0.68 o mayor), mientras que las correlaciones entre DC y funciones de DC fueron cerca de uno. Las correlaciones de DC con BW y CE variaron poco con la transformación aplicada a DC, yendo (en valor absoluto) de 0.26 a 0.28 y 0.10 a 0.12, respectivamente. La correlación entre BW y CE fue de 0.06. El estudio apunta a una serie de problemas asociados con el uso de DC como variable reproductiva en vacunos de carne. Se concluye que aunque DC es actualmente una útil variable reproductiva de campo, la búsqueda de rasgos

Transient laminar opposing mixed convection in a symmetrically heated duct with a plane symmetric sudden contraction-expansion: Buoyancy an inclination effects

NASA Astrophysics Data System (ADS)

Martínez-Suástegui, Lorenzo; Barreto, Enrique; Treviño, César

2015-11-01

Transient laminar opposing mixed convection is studied experimentally in an open vertical rectangular channel with two discrete protruded heat sources subjected to uniform heat flux simulating electronic components. Experiments are performed for a Reynolds number of Re = 700, Prandtl number of Pr = 7, inclination angles with respect to the horizontal of γ =0o , 45o and 90o, and different values of buoyancy strength or modified Richardson number, Ri* =Gr* /Re2 . From the experimental measurements, the space averaged surface temperatures, overall Nusselt number of each simulated electronic chip, phase-space plots of the self-oscillatory system, characteristic times of temperature oscillations and spectral distribution of the fluctuating energy have been obtained. Results show that when a threshold in the buoyancy parameter is reached, strong three-dimensional secondary flow oscillations develop in the axial and spanwise directions. This research was supported by the Consejo Nacional de Ciencia y Tecnología (CONACYT), Grant number 167474 and by the Secretaría de Investigación y Posgrado del IPN, Grant number SIP 20141309.

Astronomía en la cultura

NASA Astrophysics Data System (ADS)

López, A.; Giménez Benitez, S.; Fernández, L.

La Astronomía en la Cultura es el estudio interdisciplinario a nivel global de la astronomía prehistórica, antigua y tradicional, en el marco de su contexto cultural. Esta disciplina abarca cualquier tipo de estudios o líneas de investigación en que se relacione a la astronomía con las ciencias humanas o sociales. En ella se incluyen tanto fuentes escritas, relatos orales como fuentes arqueológicas, abarcando entre otros, los siguientes temas: calendarios, observación práctica, cultos y mitos, representación simbólica de eventos, conceptos y objetos astronómicos, orientación astronómica de tumbas, templos, santuarios y centros urbanos, cosmología tradicional y la aplicación ceremonial de tradiciones astronómicas, la propia historia de la astronomía y la etnoastronomía (Krupp, 1989) (Iwaniszewski, 1994). En nuestro trabajo abordamos la historia y situación actual de esta disciplina, sus métodos y sus relaciones con otras áreas de investigación.

Contest ``LET your School GO Into - Space Baptism 2007

NASA Astrophysics Data System (ADS)

Sánchez, G.

2009-05-01

The contest ``Space Baptism 2007'' was organized with the cooperation of the Mirador de la Ciencia, a science museum associated with the local zoo in Barquisimeto, Venezuela, and in collaboration with the Asociación Larense de Astronomía, a local astronomy amateur group. This contest was aimed at students of primary schools and had as a final award the chance to give a proper name to an asteroid. The ultimate goal of the contest was to promote basic and space sciences to children and the young through activities that involved the creation of stories related to astronomy, enforcing creativity and originality, and encouraging group work and solidarity. As a result, the asteroid (12758) 1993 SM3 will be known from now on as (12758) Kabudarí. The success of this initiative is demonstrated by stories about the contest that appeared in several publications in local newspapers and magazines about the school and the students who won the contest. We are currently developing plans for repetitions of the contest to name two more asteroids.

The influence of electrohydrodynamic flow on the distribution of chemical species in positive corona

NASA Astrophysics Data System (ADS)

Pontiga, Francisco; Yanallah, Khelifa; Bouazza, R.; Chen, Junhong

2015-09-01

A numerical simulation of positive corona discharge in air, including the effect of electrohydrodynamic (EHD) motion of the gas, has been carried out. Air flow is assumed to be confined between two parallel plates, and corona discharge is produced around a thin wire, midway between the plates. Therefore, fluid dynamics equations, including electrical forces, have been solved together with the continuity equation of each neutral species. The plasma chemical model included 24 chemical reactions and ten neutral species, in addition to electrons and positive ions. The results of the simulation have shown that the influence of EHD flow on the spatial distributions of the species is quite different depending on the species. Hence, reactive species like atomic oxygen and atomic nitrogen are confined to the vicinity of the wire, and they are weakly affected by the EHD gas motion. In contrast, nitrogen oxides and ozone are efficiently dragged outside the active region of the corona discharge by the EHD flow. This work was supported by the Spanish Government Agency ``Ministerio de Ciencia e Innovación'' under Contract No. FIS2011-25161.

DOE Office of Scientific and Technical Information (OSTI.GOV)

Law, P.R.

In Matsushita (J. Math. Phys. {bold 22}, 979--982 (1981), {ital ibid}. {bold 24}, 36--40 (1983)), for curvature endomorphisms for the pseudo-Euclidean space {ital R}{sup 2,2}, an analog of the Petrov classification as a basis for applications to neutral Einstein metrics on compact, orientable, four-dimensional manifolds is provided. This paper points out flaws in Matsushita's classification and, moreover, that an error in Chern's ( Pseudo-Riemannian geometry and the Gauss--Bonnet formula,'' Acad. Brasileira Ciencias {bold 35}, 17--26 (1963) and {ital Shiing}-{ital Shen} {ital Chern}: {ital Selected} {ital Papers} (Springer-Verlag, New York, 1978)) Gauss--Bonnet formula for pseudo-Riemannian geometry was incorporated in Matsushita's subsequentmore » analysis. A self-contained account of the subject of the title is presented to correct these errors, including a discussion of the validity of an appropriate analog of the Thorpe--Hitchin inequality of the Riemannian case. When the inequality obtains in the neutral case, the Euler characteristic is nonpositive, in contradistinction to Matsushita's deductions.« less

Astronomy in Cuba: practice and trends. An effort to develop a non-formal education programme

NASA Astrophysics Data System (ADS)

Pomares, Oscar A.

In the recent past years, a daily stronger movement of non-professional astronomers has become the center of development for astronomy, a subject of study practically absent now from the national education system in Cuba. A key roll in this movement has been played by the professional staff of the Department of Astronomy of the Institute of Geophysics and Astronomy. As direct outcome of this joint effort between astronomers and amateurs is the research on meteors and comets, presented in two national and one international scientific meeetings. The opening last year of the "Palacio de las Ciencias" in the main building of the country, "El Capitolio Nacional", the participation in conferences and workshops of professional astronomers facing the general public, and their participation in prime-time TV and radio programs open a way for the growth of astronomical knowledge among the Cuban people. Two national meeetings gathering together professional and non- professional astronomers have been held already. Future works in the NEOs international campaign are foreseen. Practice and trends of astronomy in Cuba clarify views of our future in the oldest natural science.

Relationship between the Fluorescence Lifetime of Chlorophyll 'a' and Primary Productivity within the Mississippi River Plume and Adjacent Shelf Region

NASA Technical Reports Server (NTRS)

Hall, Callie; Miller, Richard L.; Fernandez, Salvador M.; McKee, Brent A.

2000-01-01

In situ measurements of chlorophyll fluorescence intensity have been widely used to estimate phytoplankton biomass. However, because the fluorescence quantum yield of chlorophyll a in vivo can be highly variable, measurements of chlorophyll fluorescence intensity cannot be directly correlated with phytoplankton biomass and do not provide information on the physiological state of the phytoplankton under study. Conversely, lifetime-based measurements of chlorophyll fluorescence provide a framework in which photosynthetic rates of phytoplankton can be analyzed according to phytoplankton physiology. Along with the measurement of primary production and ambient nutrient concentrations within the Mississippi River plume in the northern Gulf of Mexico, phytoplankton fluorescence lifetimes were measured using a Fluorescence Lifetime Phytoplankton Analyzer (developed under a NASA Small Business Innovative Research contract to Ciencia, Inc.). Variability of fluorescence lifetimes within the plume can be used as a background from which to interpret variations in the maximum quantum yield of photochemistry. The extent to which nutrient and effluent loading in this dynamic coastal area affect the photosynthetic performance of phytoplankton will be presented as a function of phytoplankton fluorescence lifetimes.

[Succesful collaborations between three Mexican institutions for research on dislipidemias, obesity and diabetes].

PubMed

Aguilar-Salinas, Carlos A; Canizales-Quinteros, Samuel; Rojas-Martínez, Rosalba; García-García, Eduardo; Olaiz-Fernández, Gustavo; Gómez-Pérez, Francisco J; Tusié-Luna, María Teresa

2007-01-01

To describe the contributions ofthree Mexican institutions (Instituto Nacional de Ciencias Médicas y Nutrición "Salvador Zubirán", Universidad Nacional Autónoma de México and the Centro de Encuestas Nacionales de Salud of the Instituto Nacional de Salud Pública) in the study, of chronic degenerative disorders. The most relevant group contributions include: the identification of a risk allele for metabolic syndrome and diabetes, specific for the Mexican population (the R230C variant of the ABC-A1 transporter); the design and validation of a population-based definition of metabolic syndrome which is useful to predict the risk of incident diabetes; the description of the molecular epidemiology of familial hypercholesterolemia in Mexico and the identification of several loci associated with familial combined hyperlipidemia. In addition, members of these institutions have participated in the description of the epidemiology of diabetes, metabolic syndrome and lipid abnormalities. The complementary approach of these research groups has facilitated successful collaborations. Our results will be useful for the future development of diagnostic tests and preventive programs.

The Influence of Oxygen in Transition Metal Oxides

NASA Astrophysics Data System (ADS)

Bach, P. L.; Leboran, V.; Rivadulla, F.

2012-02-01

The existence of a 2D metallic state at the interface between LaAlO3 and SrTiO3 (LAO/STO) has generated much excitement. Its origin has been attributed to charge redistribution to avoid a dielectric catastrophe; however, oxygen vacancies in TiO2-terminated STO can play a significant role in the electronic properties of the interface. In order to determine the nature and origin of the metallic phase, we have induced vacancies in TiO2-terminated STO single crystal substrates by annealing under controlled vacuum conditions. We report resistivity, Hall effect, and thermopower measurements on these materials and discuss their implications for the nature of the 2D electron gas at the STO surface. We have explored the possibility of gate-tuning these systems in order to fabricate single-oxide based devices. This work was supported by the Ministerio de Ciencia e Innovaci'on (Spain), grant MAT2010-16157, and the European Research Council, grant ERC-2010-StG 259082 2D THERMS.

A model for the behaviour of the Solar Energetic Particle Events inside Magnetic Clouds

NASA Astrophysics Data System (ADS)

Medina, J.; Hidalgo, M. A.

2006-12-01

The modulation effects of the solar ejecta over the solar energetic particle event SEPe fluxes (0,5-100 MeV) provided by solar flares have recently been highlighted. Especially important is the behaviour of these fluxes inside MCs where, in spite of the low magnetic field intensities of these interplanetary structures (about 30 nT), a decrease in the population of the energetic particles is observed. In the present work it is shown a simple theoretical model we have developed to analyse the behaviour of those fluxes inside the magnetic clouds (MCs) using, as a starting point, our previous magnetic field model for MCs. The experimental data from ACE, GOES, SAMPEX, SOHO, Ulysses and WIND satellites are presented, both from MC coincident with SEPe and not coincident. This work has been supported by the Spanish Comisión Internacional de Ciencia y Tecnología (CICYT), grant ESP2005-07290-C02-01 and ESP2006-08459 and Madrid Autonomous Community / University of Alcala grant CAM-UAH 2005/007. This work is performed inside COST Action 724.

La Resonancia J/$$\\psi$$ y Sus Implicaciones Para La Masa Del W (in Spanish)

DOE Office of Scientific and Technical Information (OSTI.GOV)

Sanchez-Hernandez, Alberto

Es un placer agradecer a mi asesor el doctor Heriberto Castilla Valdez por brindarme sus conocimientos, experiencia y paciencia en el desarrollo de esta tesis; tambien quiero agradecer al profesor H.E. Fisk, por su apoyo econemico en mi estancia en Fermilab. De igual forma agradezco a los doctores Arturo Fernandez Telles, Miguel Angel Perez Angen y Rebeca Juarez Wisozka quienes me introdujeron al campo de la fisica experimental de altas energfas. Agradezco tambien a Maribel Rios Cruz, Ruben Flores Mendieta, Juan Morales Corona, Fabiola Vazquez Valencia, Salvador Carrillo Moreno y Cecilia Uribe Estrada por su amistad y compaiierismo durante elmore » desarrollo de mi maestria. Un especial agradecimiento a Ian Adam y Kina Denisenko por su valiosa ayuda, comentarios y discusiones durante mi estancia en Fermilab. Por ultimo quisiera agradecer a mis profesores, amigos y familiares quienes siempre me apoyaron y alentaron y al Consejo N acional de Ciencia y Tecnologfa asf como al Departamento de Fisica de Cinvestav por su apoyo econemlco.« less

Effect of strain on the electronic structure of graphene

NASA Astrophysics Data System (ADS)

Martinez, Edgar; Cifuentes, Eduardo; de Coss, Romeo

2008-03-01

Graphene has been attracting interest due to its remarkable physical properties resulting from an electron spectrum resembling relativistic dynamics (Dirac fermions). Thus, is desirable to know methods for controling the charge carriers in graphene. In this work, we propose that the electronic properties of graphene can be modulated via isotropic and uniaxial strain. We have studied the electronic structure of graphene under mechanical deformation by means of first principles calculations. We present results for the charge distribution, electronic density of states, and band structure. We focus the analysis on the behavior of the Dirac cones and the number of the charge carriers as a function of strain. We find that an isotropic tensile strain increases the effective mass of carriers and an isotropic compression strain decrease it. Uniaxial tensile strain induce a similar behavior, as strain increase effective mass increase. Thus, our results show that strain allows controllable tuning of the graphene electronic properties. This research was supported by Consejo Nacional de Ciencia y Tecnolog'ia (Conacyt) under Grant No. 43830-F.

Defect-induced magnetism in graphene nanoflakes

NASA Astrophysics Data System (ADS)

Martinez-Guerra, E.; Cifuentas-Quintal, M. E.; de Coss, R.

2009-03-01

The interaction between electron spin and the magnetic moments of vacancies in graphene could open new opportunities for spintronic and quantum computation. In that direction, we have studied the magnetic properties of graphene nanoflakes (C6n2H6n) with vacancies within the framework of density functional theory, using the pseudopotential LCAO method with a Generalized Gradient Approximation (GGA) for the exchange-correlation energy functional. In particular, we have calculated the magnetic moment of graphene nanoflakes of different diameters with a simple vacancy. We have found that the total spin-polarization of the graphene nanoflakes with a simple vacancy decreases as the diameter increases. In particular, we show that the vacancy induces the appereance of a midgap state at Fermi level. Thus, the spin degeneracy is broken, being only one of the spin channels of the midgap state occupied, the other being empty. This feature could be exploited for future spintronic applications. This research was supported by Consejo Nacional de Ciencia y Tecnolog'ia (Conacyt) under Grant No. 83604.

Electron-phonon coupling and superconductivity in MgB2 under hydrostatic pressure.

NASA Astrophysics Data System (ADS)

Quijano, Ramiro; Aguayo, Aaron

2005-03-01

We have studied the dynamics and coupling of the E2g phonon mode with the σ-band in MgB2 under pressure using the Frozen Phonon Approximation. The results were obtained by means of first-principles total-energy calculations using the full potential Linearized Augmented Plane Wave (LAPW) method and the Generalized Gradient Approximation (GGA) for the exchange-correlation potential. We present results for the evolution of the anharmonicity and phonon frequency of the E2g mode, the electron-phonon coupling constant, and Tc as a function of hydrostatic pressure in the range 0-40 GPa. We find that the phonon frequency increases monotonically with pressure, but the the anharmonicity, the electron-phonon coupling and Tc decreases with pressure. We have obtained a very good agreement between the calculated Tc(P) and the experimental data available in the literature, in particular with the experimental data corresponding to monocystalline samples. This work was supported by Consejo Nacional de Ciencia y Tecnolog'ia (CONACYT, M'exico) under Grant No. 43830-F.

Energetic Particles Events inside Magnetic Clouds

NASA Astrophysics Data System (ADS)

Medina, Jose; Hidalgo, Miguel Angel; Blanco, Juan Jose; Rodriguez-Pacheco, Javier

The effect of the magnetic topology of the Magnetic Clouds (MCs) over the energetic particle event (EPe) fluxes (0.5-100 MeV) have been simulated. In the data corresponding to the ion and electron fluxes, a depression after a strong maximum is observed when a EPe passes through a MC. Using our cross-section circular and elliptical MC models (Journal of Geophysical Research 107(1), doi:10.1029/2001JA900100 (2002) and Solar Physics 207(1), 187-198 (2002)) we have tried to explain that effect, understanding the importance of the topology of the MC. In sight of the results of the preliminary analysis we conclude that the magnitude of the magnetic field seems not to play a significant role but the helicoidal topology associated with topology of the MCs. This work has been supported by the Spanish Comisín Internacional de o Ciencia y Tecnoloǵ (CICYT), grant ESP2005-07290-C02-01 and ESP2006-08459. This work ıa is performed inside COST Action 724.

First principles study of NH3 adsorption on carbon nanowires

NASA Astrophysics Data System (ADS)

Tapia, Jorge-Alejandro; Sanchez, Alvaro-Daniel; Acosta, Cesar; Canto, Gabriel

2009-03-01

Recently has been reported a new type of one-dimensional carbon structures. Carbon nanowires formed by a linear carbon-atom chain inside an armchair (5,5) carbon nanotube has been observed using high-resolution transmission electron microscopy. Theoretical and experimental studies of the NH3 adsorption in the carbon nanotubes report changes in the electronic properties of the carbon nanotubes. In the present work we have studied the electronic and structure properties of carbon nanowires (chain@SWCNT) when NH3 atoms are adsorbed. We used the Density Functional Theory and the calculations where performed by the pseudopotentials LCAO method (SIESTA code) and the Generalized Gradient Approximation (GGA) for the exchange-correlation potential. We have analyzed the changes in the atomic structure and density of states (DOS). We found that the electronic character of the carbon chain of the chain@SWCNT system, can be modulate by NH3 adsorption. This research was supported by SEP under Grant No. PROMEP/103.5/07/2595 and the Consejo Nacional de Ciencia y Tecnolog'ia (Conacyt) under Grants No. 82497 and 60534.

Effect of acclimation to outdoor condition on the sexual performance of mass-produced Medflies (Diptera: Tephritidae)

DOE Office of Scientific and Technical Information (OSTI.GOV)

Pereira, R.; Silva, N.; Quintal, C.

Application of the sterile insect technique (SIT) as part of integrated area-wide programs to control the Mediterranean fruit fly (medfly) Ceratitis capitata (Wiedemann) require that the released males attract wild females and transfer sterile sperm. However, knowledge about male sexual performance after they are released is scarce. We conducted a study to evaluate male sexual performance in field cage tests, according to standard quality control procedures. Mass-reared 5-d-old sterile males from the genetic sexing strain VIENNA 7mix2000 were acclimated for 0, 1, and 3 d to outdoor conditions before competing with wild males for wild females. Although the proportion ofmore » mating (PM) in the test was satisfactory, the resulting relative sterility index (RSI) data showed no significant differences among the treatments. The data indicate that pre-conditioning males to outdoor conditions in Madeira did not confer an advantage in field cage sexual performance. (author) [Spanish] La aplicacion de la tecnica del insecto esteril (TIE) como parte de un programa integrado de amplio efecto para el control de la mosca mediterranea de la fruta Ceratitis capitata (Wiedemann) requiere que los machos liberados atraigan las hembras naturales y transfieran su esperma. Sin embargo, el conocimiento del desempeno sexual de los machos despues de ser liberados es muy escaso. Nosotros realizamos un estudio para evaluar el desempeno sexual de los machos en pruebas usando jaulas del campo, segun los procedimientos estandardizados de calidad. Machos esteriles de 5 dias de edad de la raza que separa los sexos geneticamente VIENNA 7mix2000 criados en masa fueron aclimatados por 0, 1 y 3 dias en condiciones de campo antes de competir con machos naturales para las hembras naturales. Aunque la proporcion del apareamiento en la prueba fue satisfactorio, el indice relativo de esterilidad (IRS) resultante no mostro ninguna diferencia significativa entre los tratamientos. Los datos indicaron que

Uso de recursos y costos de hospitalizaciones por insufi ciencia card í aca: un estudio retrospective multic é ntrico en Argentina.

PubMed

Augustovski, Federico; Caporale, Joaquín; Fosco, Matías; Alcaraz, Andrea; Diez, Mirta; Thierer, Jorge; Peradejordi, Margarita; Pichon Riviere, Andrés

2017-12-01

Heart failure has a great impact on health budget, mainly due to the cost of hospitalizations. Our aim was to describe health resource use and costs of heart failure admissions in three important institutions in Argentina. Multi-center retrospective cohort study, with descriptive and analytical analysis by subgroups of ejection fraction, blood pressure and renal function at admission. Generalized linear models were used to assess the association of independent variables to main outcomes. We included 301 subjects; age 75.3±11.8 years; 37% women; 57% with depressed ejection fraction; 46% of coronary etiology. Blood pressure at admission was 129.8±29.7 mmHg; renal function 57.9±26.2 ml/min/1.73 m 2 . Overall mortality was 7%. Average length of stay was 7.82±7.06 days (median 5.69), and was significantly longer in patients with renal impairment (8.9 vs. 8.18; p=0.03) and shorter in those with high initial blood pressure (6.08±4.03; p=0.009). Mean cost per patient was AR$68,861±96,066 (US$=8,071; 1US$=AR$8.532); 71% attributable to hospital stay, 20% to interventional procedures and 6.7% to diagnostic studies. Variables independently associated with higher costs were depressed ejection fraction, presence of valvular disease, and impaired renal function. Resource use and costs associated to hospitalizations for heart failure is high, and the highest proportion is attributable to the costs related to hospital stay. Copyright © 2017. Published by Elsevier Inc.

Caminos a la Ciencia: Recruiting and Retaining Latina High School Students in the Geosciences and Other STEM Disciplines through Cohort Learning

NASA Astrophysics Data System (ADS)

Michelsen, R. R. H.; Dominguez, R.; Marchetti, A. H.

2017-12-01

The Commonwealth of Virginia has a significant and growing Latinx population, however this population is underrepresented in the Science, Technology, Engineering, and Mathematics (STEM) workforce. Hispanic American participation in STEM degrees is low, making up only 4.5% of all Geoscience Bachelor's degrees in 2008. This student population faces challenges including a high poverty rate, lack of family members or mentors who have attended college, and lack of placement in or availability of advanced high school science and math courses. Latina girls face additional challenges such as family responsibilities and overcoming stereotypes about science and math abilities. We have developed a program that is designed to recruit Latina high schoolers, expose them to and engage them in STEM disciplines, and facilitate their matriculation into college. There are two components: a multi-year, week-long summer residential program at Randolph-Macon College (RMC), where the participants live and work together, and special events at our partners during the school year. The residential program consists of science and technology activities with RMC faculty, such as field work focusing on hydrology and space science laboratories. Students also travel to non-profit partners such as the Lewis Ginter Botanical Gardens and connect with Latinx scientists and engineers at local corporate partners such as WestRock, a paper/cardboard packaging company. The girls will return next summer for more in-depth research experiences and receive a college scholarship upon their completion of the program. During the school year, there will be monthly activities at our non-profit partners to keep the girls engaged and strengthen relationships in the cohort. Strengths of our program include 1) attention to engaging high schoolers' families with targeted programming for them on campus the first day of the program, 2) providing all materials in Spanish as well as English, and 3) a team consisting of academic, non-profit, and Fortune-500 corporate stakeholders. Here we report the successes of the first summer program as well as the attitudes of the participants towards STEM before and after the program.

La EPA ayuda a restaurar el laboratorio de ciencias de Puerto Rico y las capacidades de monitorear la calidad del aire

EPA Pesticide Factsheets

La EPA continúa ayudando a Puerto Rico a responder tras los daños causados por los huracanes Irma y María. La EPA, conforme a una misión asignada por FEMA, y en estrecha cooperación con el gobierno de Puerto Rico, se encuentra apoya

The Spanish Society of Soil Science: Main projects and activities developed during the last years

NASA Astrophysics Data System (ADS)

Porta, Jaume; Mataix-Solera, Jorge; Ortiz-Bernad, Irene; Arbelo, Carmen D.; Díaz-Raviña, Montserrat; Badía, David; Alcañiz, Josep M.; Santos, Fernando; Hermosin, M. Carmen; Barral, M. Teresa

2017-04-01

The Spanish Society of Soil Science (in Spanish: Sociedad Española de la Ciencia del Suelo, SECS) was founded in 1947 by the Spanish National Research Council (CSIC) to promote cohesion and collaboration between soil science professionals, and with an innovative spirit and a willingness to serve the society. The objectives are: to promote the study, knowledge, research and protection of the soil; to spread, from a scientific point of view, the role played by the soil in favour of society, through ecosystem services such as the production of food and raw materials; The SECS also focus on the protection of other habitats and the conservation of our archaeological heritage; and to preserve knowledge of the soil, its management and use, both from the production and environmental point of view, leading to the optimization of its capabilities. The activities and services of the SECS are accessible on the web site www.secs.com.es, which is continually updated. In this contribution, we will show some examples of recent projects and activities developed by the SECS such as: the edition of the Spanish Journal of Soil Science (SJSS) since 2011; books like the white book on "Tratamiento del suelo en los libros de texto de ESO y Bachillerato en España" available in http://www.secs.com.es/archivo/libro-suelo.pdf, in which the term "Soil" is analysed in many secondary school books (152) in the Spanish education system; conferences, courses, exhibitions, expositions, calendars, the comic "Vivir en el suelo" in diferent languages, and diverse material to promote and disseminate the importance of the soil to the society; and last but not least, the Multingual Soil Science Dictionary (Spanish, Catalan, Gallician and Potuguese with translations in English and French (in process)) available online: http://cit.iec.cat/GLOSECS/inici.html. The promotion of student teams for soil science contests, the SECS Award to attend the Simposio Latinoamericano de Enseñanza y Educación en Ciencia

Alfabetización en Astronomía de docentes de Educación Primaria y de Educación Secundaria en La Plata

NASA Astrophysics Data System (ADS)

De Biasi, M. S.; Orellana, R. B.

2014-10-01

La educación de este siglo tiene como uno de sus retos alcanzar la alfabetización cientfica de todos los ciudadanos para que comprendan y tomen decisiones sobre el mundo natural y sus cambios originados por la actividad humana utilizando el conocimiento científico. En esta misión los docentes de los niveles obligatorios de enseñanza juegan un papel clave por su rol de agentes multiplicadores del conocimiento. Se requiere, entonces de una adecuada alfabetización en ciencias de los docentes o, como mínimo, que dominen los temas científicos a enseñar. En el campo de la Astronomía, numerosas investigaciones han señalado que maestros de primaria y estudiantes de profesorados poseen una escasa formación en estos temas (Camino 1995 y 1999, Gangui 2010), que frecuentemente presentan a los alumnos concepciones alternativas o no científicas de los fenómenos astronómicos cotidianos (Kriner 2004, Vega Navarro 2007, Gangui et al 2010); a lo que se suma la presentación confusa o errónea de algunos temas astronómicos en los textos escolares (Kriner 2004). Desde 2011, la Facultad de Ciencias Astronómicas y Geofísicas, UNLP, ofrece un curso de capacitación destinado a fortalecer y actualizar los contenidos académicos y didácticos de los docentes del distrito La Plata utilizando diversas estrategias didácticas. Los contenidos comprenden los temas astronómicos de los diseños curriculares vigentes. La evaluación diagnóstica de los conocimientos previos de los docentes cursantes sobre los contenidos de mayor presencia en los diseños curriculares mostró resultados similares a las investigaciones arriba mencionadas. Referente a los movimientos de la Tierra, en promedio, el 54% poseía conceptos erróneos y el 16% no los sabía; con referencia a la Luna el 56% poseía conceptos erróneos y un 4% no los sabía. Los resultados del curso mostraron que el 95% de los docentes revirtió sus conceptos previos erróneos, que adquirió criterios para la búsqueda de

Human decidual stromal cells secrete soluble pro-apoptotic factors during decidualization in a cAMP-dependent manner.

PubMed

Leno-Durán, E; Ruiz-Magaña, M J; Muñoz-Fernández, R; Requena, F; Olivares, E G; Ruiz-Ruiz, C

2014-10-10

, a crucial process for successful pregnancy, takes place. This work was supported by the Consejería de Economía, Innovación y Ciencia, Junta de Andalucía (Grant CTS-6183, Proyectos de Investigación de Excelencia 2010 to C.R.-R.) and the Instituto de Salud Carlos III, Ministerio de Economía y Competitividad, Spain (Grants PS09/00339 and PI12/01085 to E.G.O.). E.L.-D. was supported by fellowships from the Ministerio de Educación y Ciencia, Spain and the University of Granada. The authors have no conflict of interest. © The Author 2014. Published by Oxford University Press on behalf of the European Society of Human Reproduction and Embryology. All rights reserved. For Permissions, please email: journals.permissions@oup.com.

Physics in the Andean Countries: A Perspective from Condensed Matter, Novel Materials and Nanotechnology

NASA Astrophysics Data System (ADS)

Prieto, P.

2009-05-01

We will discuss the current state of R&D in the fields of condensed matter, novel materials, and nanotechnology in the Andean nations. We will initially consider Latin America and the Caribbean (LAC) to then visualize individual developments, as well as those for the region as a whole in these fields of knowledge in each of the nations constituting the Andean Region (Bolivia, Ecuador, Chile, Venezuela, Peru, and Colombia). Based on Science & Technology watch exercises in the countries involved, along with the Iberian American and Inter-American Science & Technology Network of Indicators (Red de indicadores de Ciencia y Tecnolog'ia (RICYT) iberoamericana e interamericana)1, we will reveal statistical data that will shed light on the development in the fields mentioned. As will be noted, total R&D investment in Latin American and Caribbean countries remained constant since 1997. In spite of having reached a general increase in publications without international collaboration in LAC nations, the countries with greatest research productivity in Latin America (Argentina, Mexico, Brazil, and Chile) have strengthened their international collaboration with the United States, France, Germany, and Italy through close links associated with the formation processes of their researchers. Academic and research integration is evaluated through joint authorship of scientific articles, evidencing close collaboration in fields of research. This principle has been used in the creation of cooperation networks among participating nations. As far as networks of research on condensed matter, novel materials, and nanotechnology, the Andean nations have not consolidated a regional network allowing permanent and effective cooperation in research and technological development; as would be expected, given their idiomatic and cultural similarities, their historical background, and geographical proximity, which have been integrating factors in other research areas or socio-economic aspects. This

Ciencia Marina/Negocio y Oficina. Libro del Profesor (Marine Science/Business & Office. Teacher's Guide). B7. CHOICE (Challenging Options in Career Education).

ERIC Educational Resources Information Center

Mid-Hudson Migrant Education Center, New Paltz, NY.

Written in Spanish, the guide comprises the sixth grade unit of a career education curriculum for migrant students. The unit covers 10 marine science, business, and office occupations: hydrographer, marine biologist, fish hatchery technician, boat builder, commercial diver, clerical worker, actuary, cashier, assistant bank manager, and computer…

NOMENCLATURAL NOTES ON THE EURYTOMIDS (CHALCIDOIDEA: EURYTOMIDAE) DESCRIBED BY JEAN BRÈTHES HOUSED IN MUSEO ARGENTINO DE CIENCIAS NATURALES “BERNARDINO RIVADAVIA”

USDA-ARS?s Scientific Manuscript database

Nine species parasitic eurytomid wasps described by Jean Brèthes and deposited in the National Insect Collection of Argentina, Buenos Aires are treated and their nomenclature stabilized. The condition of the type material is described. Lectotypes are designated for Prodecatoma parodii, Eudecatoma o...

Lagrangian transport in a class of three-dimensional buoyancy-driven flows

NASA Astrophysics Data System (ADS)

Contreras, Sebastian; Speetjens, Michel; Clercx, Herman

2017-11-01

The study concerns the Lagrangian dynamics of three-dimensional (3D) buoyancy-driven cavity flows under steady and laminar conditions due to a global temperature gradient imposed via an opposite hot and cold sidewall. This serves as archetypal configuration for natural-convection flows in which gravity is perpendicular to the global temperature gradient. Limited insight into the Lagrangian properties of this class of flows motivates this study. The 3D Lagrangian dynamics are investigated in terms of the generic structure of the Lagrangian flow topology that is described in terms of the Grashof number (Gr) and the Prandtl number (Pr). Gr is the principal control parameter for the flow topology: vanishing Gr yields a state of closed streamlines (integrable state); increasing Gr causes the formation of toroidal coherent structures embedded in chaotic streamlines governed by Hamiltonian mechanisms. Fluid inertia prevails for ``smaller'' Gr. A buoyancy-induced bifurcation of the flow topology occurs for ``larger'' Gr and underlies the emergence of ``secondary rolls'' and secondary tori for ``larger'' Pr. Stagnation points and corresponding manifold interactions are key to the dynamics. S.C. acknowledges financial support from Consejo Nacional de Ciencia y Tecnología (CONACYT).

Non-isothermal electro-osmotic flow in a microchannel with charge-modulated surfaces

NASA Astrophysics Data System (ADS)

Bautista, Oscar; Sanchez, Salvador; Mendez, Federico

2015-11-01

In this work, we present an theoretical analysis of a nonisothermal electro-osmotic flow of a Newtonian fluid over charge-modulated surfaces in a microchannel. Here, the heating in the microchannel is due to the Joule effect caused by the imposition of an external electric field. The study is conducted through the use of perturbation techniques and is validated by means of numerical simulations. We consider that both, viscosity and electrical conductivity of the fluid are temperature-dependent; therefore, in order to determine the heat transfer process and the corresponding effects on the flow field, the governing equations of continuity, momentum, energy and electric potential have to be solved in a coupled manner. The principal obtained results evidence that the flow patterns are perturbed in a noticeable manner in comparison with the isothernal case. Our results may be used for increasing microfluidics mixing by conjugating thermal effects with the use of charge-modulated surfaces. This work has been supported by the research grants no. 220900 of Consejo Nacional de Ciencia y Tecnología (CONACYT) and 20150919 of SIP-IPN at Mexico. F. Méndez acknowledges also the economical support of PAPIIT-UNAM under contract number IN112215.

The leading-edge vortex of yacht sails

NASA Astrophysics Data System (ADS)

Arredondo-Galeana, Abel; Viola, Ignazio Maria

2017-11-01

We experimentally show, for the first time, that a stable Leading-Edge Vortex (LEV) can be formed on an asymmetric spinnaker, which is a high-lift sail used by yachts to sail downwind. We tested a 3D printed rigid sail in a water flume at a chord-based Reynolds number of ca. 104. We found that on the leeward side of the sail (the suction side), the flow separates at the leading edge reattaching further downstream and forming a stable LEV. The LEV grows in diameter from the root to the tip of the sail, where it merges with the tip vortex. We detected the LEV using the γ criterion, and we verified its stability over time. The lift contribution provided by the LEV was computed solving a complex potential model of each sail section. This analysis indicated that the LEV provides a substantial contribution to the total sail's lift. These findings suggest that the maximum lift of low-aspect-ratio wings with a sharp leading edge, such as spinnakers, can be enhanced by promoting a stable LEV. This work was funded by the Consejo Nacional de Ciencia y Tecnologia (CONACYT).

Lagrangian chaos in three- dimensional steady buoyancy-driven flows

NASA Astrophysics Data System (ADS)

Contreras, Sebastian; Speetjens, Michel; Clercx, Herman

2016-11-01

Natural convection plays a key role in fluid dynamics owing to its ubiquitous presence in nature and industry. Buoyancy-driven flows are prototypical systems in the study of thermal instabilities and pattern formation. The differentially heated cavity problem has been widely studied for the investigation of buoyancy-induced oscillatory flow. However, far less attention has been devoted to the three-dimensional Lagrangian transport properties in such flows. This study seeks to address this by investigating Lagrangian transport in the steady flow inside a cubic cavity differentially-heated from the side. The theoretical and numerical analysis expands on previously reported similarities between the current flow and lid-driven flows. The Lagrangian dynamics are controlled by the Péclet number (Pe) and the Prandtl number (Pr). Pe controls the behaviour qualitatively in that growing Pe progressively perturbs the integable state (Pe =0), thus paving the way to chaotic dynamics. Pr plays an entirely quantitative role in that Pr<1 and Pr>1 amplifies and diminishes, respectively, the perturbative effect of non-zero Pe. S.C. acknowledges financial support from Consejo Nacional de Ciencia y Tecnología (CONACYT).

Reduced 3d modeling on injection schemes for laser wakefield acceleration at plasma scale lengths

NASA Astrophysics Data System (ADS)

Helm, Anton; Vieira, Jorge; Silva, Luis; Fonseca, Ricardo

2017-10-01

Current modelling techniques for laser wakefield acceleration (LWFA) are based on particle-in-cell (PIC) codes which are computationally demanding. In PIC simulations the laser wavelength λ0, in μm-range, has to be resolved over the acceleration lengths in meter-range. A promising approach is the ponderomotive guiding center solver (PGC) by only considering the laser envelope for laser pulse propagation. Therefore only the plasma skin depth λp has to be resolved, leading to speedups of (λp /λ0) 2. This allows to perform a wide-range of parameter studies and use it for λ0 <<λp studies. We present the 3d version of a PGC solver in the massively parallel, fully relativistic PIC code OSIRIS. Further, a discussion and characterization of the validity of the PGC solver for injection schemes on the plasma scale lengths, such as down-ramp injection, magnetic injection and ionization injection, through parametric studies, full PIC simulations and theoretical scaling, is presented. This work was partially supported by Fundacao para a Ciencia e Tecnologia (FCT), Portugal, through Grant No. PTDC/FIS-PLA/2940/2014 and PD/BD/105882/2014.

Chest CT findings in patients with dysphagia and aspiration: a systematic review

PubMed Central

Scheeren, Betina; Gomes, Erissandra; Alves, Giordano; Marchiori, Edson; Hochhegger, Bruno

2017-01-01

ABSTRACT The objective of this systematic review was to characterize chest CT findings in patients with dysphagia and pulmonary aspiration, identifying the characteristics and the methods used. The studies were selected from among those indexed in the Brazilian Virtual Library of Health, LILACS, Indice Bibliográfico Español de Ciencias de la Salud, Medline, Cochrane Library, SciELO, and PubMed databases. The search was carried out between June and July of 2016. Five articles were included and reviewed, all of them carried out in the last five years, published in English, and coming from different countries. The sample size in the selected studies ranged from 43 to 56 patients, with a predominance of adult and elderly subjects. The tomographic findings in patients with dysphagia-related aspiration were varied, including bronchiectasis, bronchial wall thickening, pulmonary nodules, consolidations, pleural effusion, ground-glass attenuation, atelectasis, septal thickening, fibrosis, and air trapping. Evidence suggests that chest CT findings in patients with aspiration are diverse. In this review, it was not possible to establish a consensus that could characterize a pattern of pulmonary aspiration in patients with dysphagia, further studies of the topic being needed. PMID:28767772

The species of Hemiancistrus (Siluriformes: Loricariidae) from Ecuador.

PubMed

Provenzano R, Francisco; Barriga S, Ramiro

2017-05-29

At the Fish Collection of the Instituto de Ciencias Biológicas, Escuela Politécnica Nacional, Quito, three species traditionally grouped in the genus Hemiancistrus were identified: H. annectens (Regan 1904), H. landoni Eigenmann 1916, and a new specie described here. The new species inhabits exclusively in the Esmeraldas River Basin, Pacific slope, northwestern Ecuador. It is easily recognized by the completely naked abdomen, with rounded, dark spots, and a different color pattern on the dorsal and caudal fins. A comparative analysis of bones related to the opercular mobility, shows important differences between H. annectens, H. landoni, and the new species, suggesting that H. annectens does not belong to the genus Hemiancistrus or the Ancistrini group. According to the characteristics observed in these bones, H. annectens shows greater similarity to those reported in species of the Hypostomini group, supporting its inclusion in this group, but placing it in the genus Hypostomus requires further analysis. On the other hand, the conditions observed on the bones of Hemiancistrus landoni and the new species suggest that both are inside of the Ancistrini group. The new species is placed in the genus Hemiancistrus tentatively, pending future analysis.

Magnetic Vortices in Nanodisks: What are the implications in macroscopic magnetic properties?

NASA Astrophysics Data System (ADS)

Gelvez Pedroza, Ciro Fernando; Patino, Edgar J.; Superconductivity; Nanodevices Laboratory Team

The study of nanodevices is of great importance nowadays. In particular nanodisks present extraordinary properties when varying their size, shape and materials. One of the most interesting ones has been the presence of magnetic vortices which are normally not present in continuous films or bulk materials. For that reason, these constitute of great interest in potential applications such as data storage, binary logic gates or nano-plasmonics. Although there are many high cost methods for fabrication we have chosen a low cost technique based on Colloidal Lithography. Using Polystyrene Nanoparticles (100nm) nanodisks of about 180 nm in diameter have been grown using Electron Beam evaporation. The fabrication technique requires a number of steps such as spin coating, oxygen plasma and Ion Beam Etching. The samples obtained with this method were Ti/Co/Nb nanodisks with various thickness of the Co layer. Micromagnetic simulations were carried out in OOMMF giving magnetic domain structure and hysteresis loops which were later compared with those obtained experimentally using Vibrating Sample Magnetometry. Simulation results suggest a critical thickness for the appearance of magnetic vortices, revealed by hysteresis loops with substantially lower coercive fields. Facultad de Ciencias,Vicerrectoria de Investigaciones - Universidad de los Andes.

Chest CT findings in patients with dysphagia and aspiration: a systematic review.

PubMed

Scheeren, Betina; Gomes, Erissandra; Alves, Giordano; Marchiori, Edson; Hochhegger, Bruno

2017-01-01

The objective of this systematic review was to characterize chest CT findings in patients with dysphagia and pulmonary aspiration, identifying the characteristics and the methods used. The studies were selected from among those indexed in the Brazilian Virtual Library of Health, LILACS, Indice Bibliográfico Español de Ciencias de la Salud, Medline, Cochrane Library, SciELO, and PubMed databases. The search was carried out between June and July of 2016. Five articles were included and reviewed, all of them carried out in the last five years, published in English, and coming from different countries. The sample size in the selected studies ranged from 43 to 56 patients, with a predominance of adult and elderly subjects. The tomographic findings in patients with dysphagia-related aspiration were varied, including bronchiectasis, bronchial wall thickening, pulmonary nodules, consolidations, pleural effusion, ground-glass attenuation, atelectasis, septal thickening, fibrosis, and air trapping. Evidence suggests that chest CT findings in patients with aspiration are diverse. In this review, it was not possible to establish a consensus that could characterize a pattern of pulmonary aspiration in patients with dysphagia, further studies of the topic being needed.

Origin and history of chondrite regolith, fragmental and impact-melt breccias from Spain

NASA Technical Reports Server (NTRS)

Casanova, I.; Keil, K.; Wieler, R.; San Miguel, A.; King, E. A.

1990-01-01

Six ordinary chondrite breccias from the Museo Nacional de Ciencias Naturales, Madrid (Spain), are described and classified as follows: the solar gas-rich regolith breccia Oviedo (H5); the premetamorphic fragmental breccias Cabezo de Mayo (type 6, L-LL), and Sevilla (LL4); the fragmental breccias Canellas (H4) and Gerona (H5); and the impact melt breccia, Madrid (L6). It is confirmed that chondrites with typical light-dark structures and petrographic properties typical of regolith breccias may (Oviedo) or may not (Canellas) be solar gas-rich. Cabezo de Mayo and Sevilla show convincing evidence that they were assembled prior to peak metamorphism and were equilibrated during subsequent reheating. Compositions of olivine and low-Ca pyroxene in host chondrite and breccia clasts in Cabezo de Mayo are transitional between groups L and LL. It is suggested, based on mineralogic and oxygen isotopic compositions of host and clasts, that the rock formed on the L parent body by mixing, prior to peak metamorphism. This was followed by partial equilibrium of two different materials: the indigenous L chondrite host and exotic LL melt rock clasts.

Entanglement transfer from microwaves to diamond NV centers

NASA Astrophysics Data System (ADS)

Gomez, Angela V.; Rodriguez, Ferney J.; Quiroga, Luis

2014-03-01

Strong candidates to create quantum entangled states in solid-state environments are the nitrogen-vacancy (NV) defect centers in diamond. By the combination of radiation from different wavelength (optical, microwave and radio-frequency), several protocols have been proposed to create entangled states of different NVs. Recently, experimental sources of non-classical microwave radiation have been successfully realized. Here, we consider the entanglement transfer from spatially separated two-mode microwave squeezed (entangled) photons to a pair of NV centers by exploiting the fact that the spin triplet ground state of a NV has a natural splitting with a frequency on the order of GHz (microwave range). We first demonstrate that the transfer process in the simplest case of a single pair of spatially separated NVs is feasible. Moreover, we proceed to extend the previous results to more realistic scenarios where 13C nuclear spin baths surrounding each NV are included, quantifying the degradation of the entanglement transfer by the dephasing/dissipation effects produced by the nuclear baths. Finally, we address the issue of assessing the possibility of entanglement transfer from the squeezed microwave light to two nuclear spins closely linked to different NV center electrons. Facultad de Ciencias Uniandes.

[Four years of raw mortality in an intensive care unit].

PubMed

Loria, Alvar; Rosas-Baruch, Agustina; Posadas, Juan Gabriel; Domínguez-Cherit, Guillermo; Rivero-Sigarroa, Eduardo

2008-01-01

To characterize magnitude and variability of raw mortality in a Mexican Intensive Care Unit (ICU). Demographic and clinical data were analyzed in 1,746 patients discharged from the ICU of the Instituto Nacional de Ciencias Medicas y Nutricion Salvador Zubiran. The data was obtained from an administrative database and covered four years (2003-2006). Overall ICU-mortality was 23% (410/1746) and was associated with two binary variables (higher mortality in weekend admissions and non-surgical cases) and three multicategorical variables (gradient of increasing mortality with increasing age, increasing diagnostic risk and increasing number of high-rish diagnoses). First biennium mortality was significantly higher than in the second biennium (29% us 19%). This higher mortality was not associated with the high risk categories of the five variables described above nor with other ICU-variables such as number of nurses and admission and discharge criteria. The only biennium difference was a higher number of physicians (specialists + residents) in the second biennium (16-20 versus 14-15 in the first). The four-year long-term ICU-mortality showed a significant decrease in the second biennium. Number of physicians was the only variable associated with the decreased mortality.

On the identity and taxonomic status of the enigmatic mantid Thespoides bolivari Chopard, 1916 (Mantodea: Mantidae, Angelinae).

PubMed

Rivera, Julio

2014-05-21

Chopard (1916) published a brief paper in which he cited and described a number of praying mantis species from the neotropics. The specimens he studied belonged to the prominent Spanish Entomologist Ignacio Bolívar y Urrutia (1850-1944), whose collection is now housed at the Museo Nacional de Ciencias Naturales in Madrid (MNCN), Spain (Izquierdo et al. 1997). In this publication Chopard described Thespoides bolivari Chopard, 1916 as a new genus and species, based on a single male obtained by French coleopterist René Oberthür in Cauca, Colombia. According to Chopard (1916) the specimen was remarkable for having, among other features, an abdomen that is markedly shorter than the rest of its body-certainly an unusual morphological trait among the Mantodea. Chopard assigned Thespoides to the Miopteryginae (Thespidae), but it was later reassigned (together with Angela Serville, 1839 as the "Angelae group") to the subfamily Schizocephalinae (Mantidae) by Giglio-Tos (1927). Current classifications consider the Angelinae to comprise a distinct subfamily of the Mantidae, with Thespoides and Angela as the only representatives of this subfamily with a Neotropical distribution (e.g. Ehrmann 2002).

Origin and history of chondrite regolith, fragmental and impact-melt breccias from Spain

NASA Astrophysics Data System (ADS)

Casanova, I.; Keil, K.; Wieler, R.; San Miguel, A.; King, E. A.

1990-06-01

Six ordinary chondrite breccias from the Museo Nacional de Ciencias Naturales, Madrid (Spain), are described and classified as follows: the solar gas-rich regolith breccia Oviedo (H5); the premetamorphic fragmental breccias Cabezo de Mayo (type 6, L-LL), and Sevilla (LL4); the fragmental breccias Canellas (H4) and Gerona (H5); and the impact melt breccia, Madrid (L6). It is confirmed that chondrites with typical light-dark structures and petrographic properties typical of regolith breccias may (Oviedo) or may not (Canellas) be solar gas-rich. Cabezo de Mayo and Sevilla show convincing evidence that they were assembled prior to peak metamorphism and were equilibrated during subsequent reheating. Compositions of olivine and low-Ca pyroxene in host chondrite and breccia clasts in Cabezo de Mayo are transitional between groups L and LL. It is suggested, based on mineralogic and oxygen isotopic compositions of host and clasts, that the rock formed on the L parent body by mixing, prior to peak metamorphism. This was followed by partial equilibrium of two different materials: the indigenous L chondrite host and exotic LL melt rock clasts.

DOE Office of Scientific and Technical Information (OSTI.GOV)

Castillo-Mejia, Fermin; Herrera-Velazquez, J. Julio E.; Gamboa-deBuen, I.

The Fuego Nuevo II (FN-II) dense plasma focus device is a small machine (4.6 kJ), operating at the Instituto de Ciencias Nucleares, UNAM, in which neutrons, as well as soft and hard X rays have been studied with a number of diagnostics. Neutrons are studied with silver activation counters, and scintillator-photomultiplier detectors, while their angular distribution inside and outside the discharge chamber have been studied with CR-39 plastic track detectors. The soft X rays are studied with a multiple-pin-hole camera and PIN diodes, while the hard X-rays are observed with the scintillator-photomultiplier detectors mentioned above. When a needle is insertedmore » on the inner electrode, a bright spot of hard x-rays can be concentrated, and used for the production of high-contrast radiography. Dosimetric measurements have been made for X-rays crossing a 300 micron aluminum window, through the axis of the machine, showing an average dose of 0.11{+-}0.01 mGy per shot. In contrast, the average dose with a hollow cathode is 0.077{+-}0.006 mGy per shot.« less

[Functional dependence and chronic disease in older Mexicans].

PubMed

Barrantes-Monge, Melba; García-Mayo, Emilio José; Gutiérrez-Robledo, Luis Miguel; Miguel-Jaimes, Alejandro

2007-01-01

The aim of this study is to determine the prevalence of functional dependence in older Mexicans and associated chronic conditions. The study was conducted between June and December 2004 in the Geriatric Department of the Instituto Nacional de Ciencias Medicas y Nutrición Salvador Zubiran, Mexico City. The data for the variables were obtained from the information in the National Study of Health and Aging in Mexico survey (ENASEM). The survey was based on the law for statistical and geographic information,Chapter V, Article 38. A total of 4,872 subjects from the national survey of aging and health in Mexico were asked about their need for help in basic activities of daily living (BADL) and instrumental activities of daily living (IADL). Presence of disease was obtained through self-reporting. Prevalence of functional dependence was 24 and 23% for BADL and IADL, respectively. Joint disease, cerebrovascular disease, cognitive impairment and depression were associated with dependency in BADL and IADL. The prevalence of functional dependence is high among Mexicans over 65 years old. This study shows the chronic conditions that are closely associated with functional dependence and provides a perspective in order to develop preventative measures.

A data-driven approach to {{\\rm{\\pi }}}^{0},{\\rm{\\eta }} and {{\\rm{\\eta }}}^{\\prime} single and double Dalitz decays

NASA Astrophysics Data System (ADS)

Escribano, Rafel; Gonzàlez-Solís, Sergi

2018-01-01

The dilepton invariant mass spectra and integrated branching ratios of the single and double Dalitz decays {\\mathscr{P}}\\to {{{l}}}+{{{l}}}-{{γ }} and {\\mathscr{P}}\\to {{{l}}}+{{{l}}}-{{{l}}}+{{{l}}}- ({\\mathscr{P}}={{{π }}}0,{{η }},{{{η }}}\\prime; {{l}}={{e}} or {{μ }}) are predicted by means of a data-driven approach based on the use of rational approximants applied to {{{π }}}0,{{η }} and {{{η }}}\\prime transition form factor experimental data in the space-like region. Supported by the FPI scholarship BES-2012-055371 (S.G-S), the Secretaria d’Universitats i Recerca del Departament d’Economia i Coneixement de la Generalitat de Catalunya under grant 2014 SGR 1450, the Ministerio de Ciencia e Innovación under grant FPA2011-25948, the Ministerio de Economía y Competitividad under grants CICYT-FEDER-FPA 2014-55613-P and SEV-2012-0234, the Spanish Consolider-Ingenio 2010 Program CPAN (CSD2007-00042), and the European Commission under program FP7-INFRASTRUCTURES-2011-1 (283286) S.G-S also Received Support from the CAS President’s International Fellowship Initiative for Young International Scientist (2017PM0031)

The construction of the idea of the city in Early Modern Europe: Pérez de Herrera and Nicolas Delamare.

PubMed

Fraile, Pedro

2010-01-01

With the economic and social changes in Europe at the end of the sixteenth century and the formation and consolidation of an urban network throughout the continent, questions such as poverty, sanitation, and hygiene began to pose acute problems in the cities of the age. A new school of thought, known in Spain as Ciencia de Policía and in the Mediterranean area as Policy Science, proposed solutions for these problems and tested them through practical interventions inside the urban setting. In this article the author compares the work of two thinkers: Cristóbal Pérez de Herrera, a Spaniard, and Nicolas Delamare, a Frenchman. Writing in the late sixteenth and early seventeenth centuries, Pérez de Herrera examined the organization of Madrid, the newly founded (though still not firmly established) capital of Spain. Delamare based his study on the Paris of the early eighteenth century. The author stresses the coincidences in some of the ideas of both thinkers and shows how their writings begin to embody a new idea of the city, many aspects of which have survived until the present day.

Astronomy Teacher Training: Towards Year 2009

NASA Astrophysics Data System (ADS)

Doddoli, Consuelo

2008-05-01

The Direccion General de Divulgacion de la Ciencia is part of Mexico's National University; its purpose is science outreach. Most of its activities are dedicated to school level audiences; nevertheless due to the speed of science development, courses are given for teachers. The astronomy curricula includes: new results in astronomy research, general astrophysics and tools to teach astronomy. The courses offer twelve two hour long sessions. An astronomy researcher delivers a lecture and teachers are trained to use hands on activity. Beginning last in 2007 it has focused on Galileo. It addressed the way he was modern scientist, he observed and made experiments and wrote his results in common language. Year 2009 is a perfect incentive to carry out activities with teachers and keep them busy organizing telescope construction and observations during and after Galileo's commemoration. A book was written specially for them on the experiments Galileo made. In this book they can find interesting hand-on activities with materials that are readily available. (Los experimentos de Galileo, Silvia Torres y Consuelo Doddoli, Correo del Maestro, 2008, in press.) The magazine Correo del Maestro holds many articles written by the author on astronomical activities aimed to teachers.

Nonlinear Excitation of the Ablative Rayleigh-Taylor Instability for All Wave Numbers

NASA Astrophysics Data System (ADS)

Zhang, H.; Betti, R.; Gopalaswamy, V.; Aluie, H.; Yan, R.

2017-10-01

Small-scale modes of the ablative Rayleigh-Taylor instability (ARTI) are often neglected because they are linearly stable when their wavelength is shorter than a linear cutoff. Using 2-D and 3-D numerical simulations, it is shown that linearly stable modes of any wavelength can be destabilized. This instability regime requires finite amplitude initial perturbations. Compared to 2-D, linearly stable ARTI modes are more easily destabilized in 3-D and the penetrating bubbles have a higher density because of enhanced vorticity. It is shown that for conditions found in laser fusion targets, short-wavelength ARTI modes are more efficient at driving mixing of ablated material throughout the target since the nonlinear bubble density increases with the wave number and small-scale bubbles carry a larger mass flux of mixed material. This work was supported by the Office of Fusion Energy Sciences Nos. DE-FG02-04ER54789, DE-SC0014318, the Department of Energy National Nuclear Security Administration under Award No. DE-NA0001944, the Ministerio de Ciencia e Innovacion of Spain (Grant No. ENE2011-28489), and the NANL LDRD program through Project Number 20150568ER.

First principles study of Al and C-doped MgB2: evolution of two gaps and critical temperature

NASA Astrophysics Data System (ADS)

de La Peña-Seaman, Omar; de Coss, Romeo; Heid, Rolf; Bohnen, Klaus-Peter

2008-03-01

We have studied the electron-phonon and superconducting properties of the Mg1-xAlxB2 and MgB2(1-x)C2x alloys within the framework of density functional perturbation theory, using a mixed-basis pseudopotential method and the virtual crystal approximation (VCA) for modeling the alloys. For both systems, the Eliashberg spectral function (2̂F(φ)) and the electron-phonon coupling parameter (λ) have been calculated in the two band model (σ,π) for several concentrations until x(Al)=0.55 and x(C)=0.175. Using the calculated 2̂ijF(φ) and a diagonal expression for the Coulomb pseudopotential matrix, &*circ;, we solved numerically the Eliashberg gap equations in the two band model without interband scattering. We reproduce the experimental decreasing behavior of δσ(x), δπ(x), and Tc(x) for both alloy systems. The role of the interband scattering in the observed behavior of the superconducting gaps and Tc in the Al- and C-MgB2 alloys is discussed. This research was supported by Consejo Nacional de Ciencia y Tecnolog'ia (Conacyt) under Grant No. 43830-F.

Absence of B1-B2 structural transition in lithium halides under hydrostatic pressure

NASA Astrophysics Data System (ADS)

de Coss, Romeo; Murrieta, Gabriel

2005-03-01

We have investigated the B1-B2 structural transition in LiF, LiCl, LiBr, and LiI under hydrostatic pressure by means of first-principles total-energy calculations using the Full- Potential LAPW method. In order to analyze the gradient effects, we have performed calculations using the local density approximation (LDA) and the generalized gradient approximation (GGA), for the exchange and correlation potential. In agreement with the experimental observations, we find that even for pressures higher than 100 GPa, the Li halides do not present the B1-B2 structural transition. In order to understand this behavior, we have calculated the distribution of the electron densities. From the analysis of the distribution of electron densities for the Li halides in the B1 and B2 phases, we find that for this group of ionic compounds the B1 phase have a distribution of electron densities more homogeneous than in the B2 phase, preventing the B1-B2 structural transition. This work was partially supported by Consejo Nacional de Ciencia y Tecnolog'ia (CONACYT, M'exico) under Grant No. 43830-F.

First principles study of hydrogen adsorption on carbon nanowires.

NASA Astrophysics Data System (ADS)

Tapia, Alejandro; Aguilera, Luis; Murrieta, Gabriel; de Coss, Romeo

2007-03-01

Recently has been reported a new type of one-dimensional carbon structures. Carbon nanowires formed by a linear carbon-atom chain inside an armchair (5,5) carbon nanotube has been observed using high-resolution transmission electron microscopy. In the present work we have studied the changes in the electronic structure of a carbon nanowires and (5,5) single-walled carbon nanotubes (SWCN) when a hydrogen atom is adsorbed. We used the Density Functional Theory and the calculations where performed by the pseudopotentials LCAO method (SIESTA code) and the Generalized Gradient Approximation (GGA) for the exchange-correlation potential. We have analyzed the changes in the atomic structure, density of states (LDOS), and the local orbital population. We found charge transfer from the nanotube to the linear chain and the hydrogen atom, the electronic character of the chain and nanotube sub-systems in chain@SWCN is the same that in the corresponding isolated systems, chain or SWCN. But the hydrogen adsorption produced changes in the atomic estructure and the electronic properties. This research was supported by PRIORI-UADY under Grant No. FING-05-004 and Consejo Nacional de Ciencia y Tecnolog'ia (Conacyt) under Grants No. 43830-F and 49985-J.

Getting In, Staying in: Community Perspectives on the Barriers to Latino Postsecondary Education. Proceedings for Town Hall on Higher Education at the 2015 National Council of La Raza Annual Conference (Kansas City, Missouri, Jul 11, 2015)

ERIC Educational Resources Information Center

National Council of La Raza, 2016

2016-01-01

Following decades of efforts to augment the educational experience of Hispanic students, progress and achievement are on the upswing. The steady rise in the high school graduation rate of Latino students is a bright spot that reflects both these efforts and the hard work of Latino students themselves. The good news is that the Hispanic community…

Indice Bibliografico Ciencias de la Educacion. Ano 1988. Volume II No. 1. (Bibliographic Index of the Education Sciences. 1988. Volume II No.1).

ERIC Educational Resources Information Center

Centro de Investigacion, Madrid (Spain). Servicio de Documentacion.

Published quarterly, this annotated bibliography indexes articles from scholarly Spanish journals, as well as significant foreign journals, considered important in the field of education. References are organized alphabetically according to subject and within each subject by number, author, and content. A users' information description is provided…

[Analysis of a proposal for changing the educational paradigm in bacteriology and virology. Facultad de Ciencias Médicas, Universidad Nacional de Córdoba].

PubMed

Márquez, E; González, S; López, T; Giayetto, V; Littvik, A; Cannistraci, R; Pavan, J

2000-01-01

The productive character of the scientific thought points out a methodological means that include the demand of the students' job about the information and not his mere reception and reproduction. It is essential to give the students the opportunity of discovering the cognitive processes used in the production of the scientific knowledge. In this work, we present the result of the starting of a workshop dynamic in a basic subject, the students' answers, and the analysis of the subject. In the Chair of Medical Bacteriology and Virology of the School of Medical Sciences, the National University of Córdoba, 1700 students attended classes in 1997. The subject was developed with the activities that worked the same contents from two different learning conceptions: (I) workshop activity, non obligatory, constructive, and (II) theorico-practical activity, obligatory and traditional. Two voluntary and anonymous interviews were done about the valuation that the student gave to these two activities and their basis, one in the middle and the other at the end of the course. 90.55% classified the traditional activity as positive, and 9.45% as negative. Regarding the workshop activity, the 60.5% classified it as positive and the 39.5% as negative. The same developed content with two activities made possible the analysis of the impact that the two different methodologies produced on the students. The student's answer to the traditional activity was better than the workshop activity (p < 0.001). The differences in the student's acceptance between the two option revealed the major difficulty of an alternative methodological strategy in the current educational model.

Evidence of Critical Thinking in High School Humanities Classrooms (Evidencias del Pensamiento Crítico en las Clases de Ciencias Humanas en Bachillerato)

ERIC Educational Resources Information Center

Alfonso, David Vargas

2015-01-01

Critical thinking skills (CTS) are a group of higher order thinking abilities related with complex processes of learning like contextualization or problem solving. This exploratory research study identified whether critical thinking skills were present in high school humanities classrooms. The study was carried out in a private school in Bogotá,…

Model determination in a case of heterogeneity of variance using sampling techniques.

PubMed

Varona, L; Moreno, C; Garcia-Cortes, L A; Altarriba, J

1997-01-12

A sampling determination procedure has been described in a case of heterogeneity of variance. The procedure makes use of the predictive distributions of each data given the rest of the data and the structure of the assumed model. The computation of these predictive distributions is carried out using a Gibbs Sampling procedure. The final criterion to compare between models is the Mean Square Error between the expectation of predictive distributions and real data. The procedure has been applied to a data set of weight at 210 days in the Spanish Pirenaica beef cattle breed. Three proposed models have been compared: (a) Single Trait Animal Model; (b) Heterogeneous Variance Animal Model; and (c) Multiple Trait Animal Model. After applying the procedure, the most adjusted model was the Heterogeneous Variance Animal Model. This result is probably due to a compromise between the complexity of the model and the amount of available information. The estimated heritabilities under the preferred model have been 0.489 ± 0.076 for males and 0.331 ± 0.082 for females. RESUMEN: Contraste de modelos en un caso de heterogeneidad de varianzas usando métodos de muestreo Se ha descrito un método de contraste de modelos mediante técnicas de muestreo en un caso de heterogeneidad de varianza entre sexos. El procedimiento utiliza las distribucviones predictivas de cada dato, dado el resto de datos y la estructura del modelo. El criterio para coparar modelos es el error cuadrático medio entre la esperanza de las distribuciones predictivas y los datos reales. El procedimiento se ha aplicado en datos de peso a los 210 días en la raza bovina Pirenaica. Se han propuesto tres posibles modelos: (a) Modelo Animal Unicaracter; (b) Modelo Animal con Varianzas Heterogéneas; (c) Modelo Animal Multicaracter. El modelo mejor ajustado fue el Modelo Animal con Varianzas Heterogéneas. Este resultado es probablemente debido a un compromiso entre la complejidad del modelo y la cantidad de datos

Comments on "Women, Development Planning and Government Policies in Pakistan".

PubMed

Hafeez, S

1992-01-01

Commentary on Shahnaz and Bilquees Raza's paper on women in development in Pakistan is supportive of the content analysis of the Sixth and Seventh 5-Year Plans and policies, but critical of the methods used n the analysis. The parallel to survey research methods was made in that there was a specification of 1) the unit of analysis (reference to each policy measure, each chapter, each page of the plan), 2) the rationale for the plan, 3) specific objectives of the examination, and 4) the criteria for analysis. Missing also was the identification of policy trends from the Fourth and Fifth 5-Year Plans. The question is never answered as to why gender issues were not directed to the agricultural sector. The conclusion that there was a hugh gap between intentions and implementation was an issue not unique to women's issues, and a deeper analysis may have been required in order to understand the nature and magnitude of the gaps for women's policies and their productive roles. Questions should have been directed to the issues of the root causes of gaps in planning and implementation of policies and programs for women in development, and the identification of quantitative and qualitative indicators of gaps. Questions arise as to whether the gaps have changed with changes in the strength of political and social will in various decades. Recognition was given by the authors to the low budget allocations between 1955 and 1970 to education and health which affected both men and women, but there was scant mention of the strong social, not political, will to enhance women's welfare prevalent at this time. Information was lacking on the differences between the Sixth and Seventh sectoral plans for agricultural employment and women and the working groups plans that did include women in agricultural employment; the question is why the working plans were not incorporated into the final plans, and why the working groups did not protest this omission. The lack of political and social

Feeding horses with industrially manufactured pellets with fungal spores to promote nematode integrated control.

PubMed

Hernández, José Ángel; Arroyo, Fabián Leonardo; Suárez, José; Cazapal-Monteiro, Cristiana Filipa; Romasanta, Ángel; López-Arellano, María Eugenia; Pedreira, José; de Carvalho, Luis Manuel Madeira; Sánchez-Andrade, Rita; Arias, María Sol; de Gives, Pedro Mendoza; Paz-Silva, Adolfo

2016-10-15

The usefulness of pellets industrially manufactured with spores of parasiticide fungi as a contribution to integrated nematode control was assessed in grazing horses throughout sixteen months. Two groups of 7 Pura Raza Galega autochthonous horses (G-T and G-P) were dewormed pour-on (1mg Ivermectin/kg bw) at the beginning of the trial, and other group (G-C) remained untreated. The G-P was provided daily with commercial pellets to which was added a mixture of fungal spores during the industrial manufacturing (2×10 6 spores of Mucor circinelloides and same dose of Duddingtonia flagrans/kg), and G-T and G-C received pellets without spores. The efficacy of the parasiticidal strategy was assessed by estimating the reduction in the faecal egg counts (FECR) and in the number of horses shedding eggs in the faeces (PHR), and also the egg reappearance periods (ERP). Blood analyses were performed to identify the changes in the red and white cell patterns. To ascertain if horses developed an IgG humoral response against the fungi, antigenic products collected from M. circinelloides and D. flagrans were exposed to the horse sera by using an ELISA. The faecal elimination of eggs of Parascaris equorum and strongyles ceased 2 weeks after treatment in G-T and G-P, thus the values of FECR and PHR were 100%. No P. equorum-eggs were detected later, and the strongyle egg reappearance period was 28 weeks in G-P, and 8 weeks in G-T. Strongyle egg-output values remained lower than 300 eggs per gram of faeces in the G-P, whereas numbers between 330 and 772 in G-C and G-T were recorded. Normal values for the erythrocytes, haemoglobin and haematocrit in horses consuming pellets with spores were recorded, and lower than normal in the other groups. Sensitization of horses to the fungal species was disproven. It is concluded that feeding horses with pellets industrially manufactured with fungal spores represents a very useful tool to implement an integrated control of helminths affecting horses

Genetic Differentiation in a Sample from Northern Mexico City Detected by HLA System Analysis: Impact in the Study of Population Immunogenetics.

PubMed

Cortés, Eva D Juárez; Sieck, Miguel A Contreras; Perea, Agustín J Arriaga; Medrano, Rosa M Macías; Jaime, Anaí Balbuena; Martínez, Paola Everardo; Zúñiga, Joaquín; Alonzo, Víctor Acuña; Granados, Julio; Barquera, Rodrigo

2017-07-01

The major histocompatibility complex is directly involved in the immune response, and thus the genes coding for its proteins are useful markers for the study of genetic diversity, susceptibility to disease (autoimmunity and infections), transplant medicine, and pharmacogenetics, among others. The polymorphism of the system also allows researchers to use it as a proxy for population genetics analysis, such as genetic admixture and genetic structure. In order to determine the immunogenetic characteristics of a sample from the northern part of Mexico City and to use them to analyze the genetic differentiation from other admixed populations, including those from previous studies of Mexico City population, we analyzed molecular typing results of donors and patients from the Histocompatibility Laboratory of the Central Blood Bank of the Centro Médico Nacional La Raza selected according to their geographic origin. HLA-A, -B, -DRB1, and -DQB1 alleles were typed by polymerase chain reaction with sequence-specific primers. Allelic and haplotype frequencies, as well as population genetics parameters, were obtained by maximum likelihood methods. The most frequent haplotypes found were HLA-A * 02/-B * 39/-DRB1 * 04/-DQB1 * 03:02P, HLA-A * 02/-B * 35/-DRB1 * 04/-DQB1 * 03:02P, HLA-A * 68/-B * 39/-DRB1 * 04/-DQB1 * 03:02P, and HLA-A * 02/-B * 35/-DRB1 * 08/-DQB1 * 04. Importantly, the second most frequent haplotype found in our sample (HLA-A * 02/-B * 35/-DRB1 * 04/-DQB1 * 03:02P) has not been previously reported in any mixedancestry populations from Mexico but is commonly encountered in Native American human groups, which can reflect the impact of migration dynamics in the genetic conformation of the northern part of Mexico City, and the limitations of previous studies with regard to the genetic diversity of the analyzed groups. Differences found in haplotype frequencies demonstrated that large urban conglomerates cannot be analyzed as one homogeneous entity but, rather, should

Solubility of sodium chloride in superionic water ice

NASA Astrophysics Data System (ADS)

Hernandez, Jean-Alexis; Caracas, Razvan

2017-04-01

, R. Gaal, Z. Raza, A. -A. Lüdl, S. Klotz, A. M. Saitta, A. F. Goncharov, P. Gillet, PNAS 112 (2015) 8216-8220

One-dimensional anyons under three-body interactions.

NASA Astrophysics Data System (ADS)

Silva-Valencia, Jereson; Arcila-Forero, Julian; Franco, Roberto

Anyons are a third class of particles with nontrivial exchange statistics, particles carrying fractional statistics that interpolate between bosons and fermions. In the last years, it has been made some proposals to emulate an anyon gas by confining bosonic atoms in optical lattices [ Nat. Commun. 2, 361 (2011)]. In this work, we studied the ground state of anyons interacting through local three-body terms in one-dimension, motivated by recent experimental and theoretical studies about multi-body interactions in cold atoms setups. We used the density-matrix renormalization group method to find the phase diagram and the von Neumann block entropy to determinate the critical point position. The main quantum phases found are the superfluid and the Mott insulator ones. For the statistical angle θ = π /4, the phase diagram shows that the Mott lobes are surrounded by superfluid regions, the Mott lobes increase with the density and the first Mott lobe has two anyons per site. We found that a Mott lobe with one anyon per site, it is possible for larger statistical angles, a fact that it is impossible with bosons. DIBE- Universidad Nacional de Colombia and Departamento Administrativo de Ciencia, Tecnología e Innovación (COLCIENCAS) (Grant No. FP44842-057-2015).

Synthesis of N-graphene using microwave plasma-based methods

NASA Astrophysics Data System (ADS)

Dias, Ana; Tatarova, Elena; Henriques, Julio; Dias, Francisco; Felizardo, Edgar; Abrashev, Miroslav; Bundaleski, Nenad; Cvelbar, Uros

2016-09-01

In this work a microwave atmospheric plasma driven by surface waves is used to produce free-standing graphene sheets (FSG). Carbonaceous precursors are injected into a microwave plasma environment, where decomposition processes take place. The transport of plasma generated gas-phase carbon atoms and molecules into colder zones of plasma reactor results in carbon nuclei formation. The main part of the solid carbon is gradually carried from the ``hot'' plasma zone into the outlet plasma stream where carbon nanostructures assemble and grow. Subsequently, the graphene sheets have been N-doped using a N2-Ar large-scale remote plasma treatment, which consists on placing the FSG on a substrate in a remote zone of the N2-Ar plasma. The samples were treated with different compositions of N2-Ar gas mixtures, while maintaining 1 mbar pressure in the chamber and a power applied of 600 W. The N-doped graphene sheets were characterized by scanning and by high-resolution transmission electron microscopy, X-ray photoelectron spectroscopy and Raman spectroscopy. Plasma characterization was also performed by optical emission spectroscopy. Work partially funded by Portuguese FCT - Fundacao para a Ciencia e a Tecnologia, under grant SFRH/BD/52413/2013 (PD-F APPLAuSE).

Illuminating sesmic discontinuities with receiver functions from a dense array in Mexico City

NASA Astrophysics Data System (ADS)

Perez-Campos, X.; Rodríguez-Domínguez, M. Á.; González-López, A.; Espindola, V. H.; Quintanar, L.; Ramirez-Guzman, L.

2017-12-01

Mexico City, with close to 10 million inhabitants, has grown over a sedimentary basin, from an old dried lake. This has been a big factor in amplifying the seismic waves from large subduction earthquakes, located > 300 km away on the Pacific coast, which represents a significant hazard. For this reason, it is of great interest to improve the knowledge of the seismic structure of the city and its details on spatial variations to reduce the uncertainty in ground motion modeling. In May 2017, such array started its way in Mexico City. It consists of 18 broadband stations, that record in place for 3-5 days, moving then to a new location. In total, the city will be covered with 343 recording sites. In this work, we present preliminary results of receiver functions obtained in such array and in permanent stations of the Seismic Network of the Valley of Mexico. Despite the few teleseismic events, the small spacing between stations ( 500 m) allows identification of converted Ps phases from the Moho discontinuity, as well as other converted phases, which might be related to subtle changes in the vertical and lateral seismic structure. This Project was funded by the Secretaria de Ciencia, Tecnología e Innovación (SECITI) of Mexico City. Project SECITI/073/2016.

Topological Photonics for Continuous Media

NASA Astrophysics Data System (ADS)

Silveirinha, Mario

Photonic crystals have revolutionized light-based technologies during the last three decades. Notably, it was recently discovered that the light propagation in photonic crystals may depend on some topological characteristics determined by the manner how the light states are mutually entangled. The usual topological classification of photonic crystals explores the fact that these structures are periodic. The periodicity is essential to ensure that the underlying wave vector space is a closed surface with no boundary. In this talk, we prove that it is possible calculate Chern invariants for a wide class of continuous bianisotropic electromagnetic media with no intrinsic periodicity. The nontrivial topology of the relevant continuous materials is linked with the emergence of edge states. Moreover, we will demonstrate that continuous photonic media with the time-reversal symmetry can be topologically characterized by a Z2 integer. This novel classification extends for the first time the theory of electronic topological insulators to a wide range of photonic platforms, and is expected to have an impact in the design of novel photonic systems that enable a topologically protected transport of optical energy. This work is supported in part by Fundacao para a Ciencia e a Tecnologia Grant Number PTDC/EEI-TEL/4543/2014.

Towards a Detailed Seismic Structure of the Valley of Mexico's Xochimilco Lake Zone.

NASA Astrophysics Data System (ADS)

Rabade, S.; Sanchez-Sanchez, J.; Ayala Hernandez, M.; Macias, M. A.; Aguilar Calderon, L. A.; Alcántara, L.; Almora Mata, D.; Castro Parra, G.; Delgado, R.; Leonardo Suárez, M.; Molina Avila, I.; Mora, A.; Perez-Yanez, C.; Ruiz, A. L.; Sandoval, H.; Torres Noguez, M.; Vazquez Larquet, R.; Velasco Miranda, J. M.; Aguirre, J.; Ramirez-Guzmán, L.

2017-12-01

Six centuries of gradual, intentional sediment filling in the Xochimilco Lake Zone have drastically reduced the size of the lake. The basin structure and the lake's clay limits and thickness are poorly constrained, and yet, essential to explain the city's anomalous ground motion. Therefore, we conducted an experiment to define the 3D velocity model of Mexico's capital; the CDMX-E3D. The initial phase involved the deployment of a moving set of 18-broadband stations with an interstation distance of 500m over a period of 19 weeks. We collected the data and analyzed the results for the Xochimilco Lake Zone using H/V Spectral Ratios (Nakamura, 1989), which provided an improved fundamental period map of the region. Results show that periods in the former lake zone have larger variability than values previously estimated. In order to obtain group velocity maps at different periods, we estimated Green's functions from ambient noise cross-correlations following standard methodologies to invert Rayleigh wave travel times (Bensen et al., 2007). Preliminary result show very low-velocity zones (100 m/s) and thick sediment layers in most of the former Xochimilco Lake area. This Project was funded by the Secretaria de Ciencia, Tecnología e Innovación (SECITI) of Mexico City. Project SECITI/073/2016.

Effect of the electric field on buckled and puckered arsenene

NASA Astrophysics Data System (ADS)

Chavez, Victor Hugo; Fernandez-Escamilla, Hector Noe; Martínez-Guerra, Edgar

With the emergence of new 2D materials, more recently phosphorene, arsenene appears as a new candidate to be explored for electronic devices. We have studied the stability of arsenene pristine and the effect of a transversal electric field on its electronic properties. The calculations were performed using the SIESTA code, with the GGA exchange-correlation functional in the PBE form. We have used numerical atomic orbitals as the basis set for the valence wavefunctions employing a double ζ-polarized basis. We use the Perdew-Becke pseudopotential for an As atom that includes the scalar-relativistic effect and Troullier-Martins parametrization. We adopt the Monkhorst-Pack scheme for k-point sampling of Brillouin zone integrations with 25 ×25 ×1 and 25 ×25 ×1 for the buckled/planar and puckered systems, respectively. We found that buckled and puckered arsenenes are stable and posses indirect gap. The effect of the electric field on the electronic structure of the buckled arsenene is the modulation of indirect to direct gap, while in puckered arsenene the gap linearly decreases as electric field is increased. This research was supported by Consejo Nacional de Ciencia y Tecnología (Conacyt) under Grant No. 43830-F.

Luminescence nanothermometry

NASA Astrophysics Data System (ADS)

Jaque, Daniel; Vetrone, Fiorenzo

2012-07-01

The current status of luminescence nanothermometry is reviewed in detail. Based on the main parameters of luminescence including intensity, bandwidth, bandshape, polarization, spectral shift and lifetime, we initially describe and compare the different classes of luminescence nanothermometry. Subsequently, the various luminescent materials used in each case are discussed and the mechanisms at the root of the luminescence thermal sensitivity are described. The most important results obtained in each case are summarized and the advantages and disadvantages of these approaches are discussed.The current status of luminescence nanothermometry is reviewed in detail. Based on the main parameters of luminescence including intensity, bandwidth, bandshape, polarization, spectral shift and lifetime, we initially describe and compare the different classes of luminescence nanothermometry. Subsequently, the various luminescent materials used in each case are discussed and the mechanisms at the root of the luminescence thermal sensitivity are described. The most important results obtained in each case are summarized and the advantages and disadvantages of these approaches are discussed. This work was supported by the Universidad Autónoma de Madrid and Comunidad Autónoma de Madrid (Project S2009/MAT-1756), by the Spanish Ministerio de Educacion y Ciencia (MAT2010-16161) and by Caja Madrid Foundation.

Synthetic Seismograms Derived from Oceanographic Data in the Campeche Canyon, Deepwater Gulf of Mexico

NASA Astrophysics Data System (ADS)

Gonzalez-Orduno, A.; Fucugauchi, J. U.; Monreal, M.; Perez-Cruz, G.; Salas de León, D. A.

2013-05-01

The seismic reflection method has been successfully applied worldwide to investigate subsurface conditions to support important business decisions in the oil industry. When applied in the marine environment, useful reflection information is limited to events on and below the sea floor; Information from the water column, if any, is disregarded. Seismic oceanography is emerging as a new technique that utilize the reflection information within the water column to infer thermal-density contrasts associated with oceanographic processes, such as cyclonic-anticyclonic eddies, ascending-descending water flows, and water flows related to rapid topographic changes on the sea floor. A seismic investigation to infer such oceanographic changes in one sector of the Campeche Canyon is in progress as a research matter at the Instituto de Ciencias del Mar y Limnologia from the University of Mexico (UNAM). First steps of the investigation consisted of creating synthetic seismograms based on oceanographic information (temperature and density) derived from direct observation on a series of close spaced depth points along vertical profiles. Details of the selected algorithms used for the transformation of the oceanographic data to acoustic impedances data sets and further construction of synthetic seismograms on each site and their representation as synthetic seismic sections, are presented in this work, as well as the road ahead in the investigation.

Parathyroid cysts: the Latin-American experience.

PubMed

Román-González, Alejandro; Aristizábal, Natalia; Aguilar, Carolina; Palacios, Karen; Pérez, Juan Camilo; Vélez-Hoyos, Alejandro; Duque, Carlos Simon; Sanabria, Alvaro

2016-12-01

Parathyroid cyst is an infrequent and unsuspected disease. There are more than 300 hundred cases reported in the world literature, a few of them are from Latin America. The experience of our centers and a review of the cases are presented. Case report of a series of patients with parathyroid cyst from our institutions according to the CARE guidelines (Case Reports). A search of Medline, Embase, BIREME ( Biblioteca Regional de Medicina ) LILACS ( Literatura Latinoamericana y del Caribe en Ciencias de la Salud ), Google Scholar and Scielo ( Scientific Electronic Library on Line ) databases and telephonic or email communications with other experts from Latin-America was performed . Six patients with parathyroid cyst were found in our centers in Colombia. Most of them were managed with aspiration of the cyst. Two of them required surgery. Only one case was functional. Twelve reports from Latin America were found for a total of 18 cases in our region adding ours. Parathyroid cysts are uncommonly reported in Latin America. Most of them are diagnosed postoperatively. Suspicion for parathyroid cyst should be raised when a crystal clear fluid is aspirated from a cyst. The confirmation of the diagnosis may be easily done if parathyroid hormone (PTH) level is measured in the cyst fluid.

[Toxic fungi in Buenos Aires City and surroundings].

PubMed

Romano, Gonzalo M; Iannone, Leopoldo; Novas, María V; Carmarán, Cecilia; Romero, Andrea I; López, Silvia E; Lechner, Bernardo E

2013-01-01

In Facultad de Ciencias Exactas y Naturales,Universidad de Buenos Aires there is a service called Servicio de Identificación de Hongos Tóxicos, directed by researchers of the Program of Medicinal Plants and Fungi Involved in Biological Degradation (PROPLAME-PRHIDEB, CONICET) that assist hospitals and other health establishments, identifying the different samples of fungi and providing information about their toxicity, so that patients can receive the correct treatment. The objective of the present study was to analyze all the cases received from 1985 to 2012. This analysis permitted the confection of a table identifying the most common toxic species. The information gathered revealed that 47% of the patients were under 18 years of age and had eaten basidiomes; the remaining 53% were adults who insisted that they were able to distinguish edible from toxic mushrooms. Chlorophyllum molybdites turned out to be the main cause of fungal intoxication in Buenos Aires, which is commonly confused with Macrolepiota procera, an edible mushroom. In the second place Amanita phalloides was registered, an agaric known to cause severe symptoms after a long period of latency (6-10 hours), and which can lead to hepatic failure even requiring a transplant to prevent severe internal injuries or even death, is not early and correctly treated.

Intraspecific variation in body size and shape in an andean highland anole species, Anolis ventrimaculatus (Squamata: Dactyloidae).

PubMed

Calderón-Espinosa, Martha L; Ortega-León, Angela M; Zamora-Abrego, Joan G

2013-03-01

Variation in body characteristics related to lizard locomotion has been poorly studied at the intraspecific level in Anolis species. Local adaptation due to habitat heterogeneity has been reported in some island species. However, studies of mainland species are particularly scarce and suggest different patterns: high variability among highland lizards and poorly differentiated populations in one Amazonian species. We characterized inter population variation of body size and shape in the highland Andean Anolis ventrimaculatus, an endemic species from Western Colombia. A total of 15 morphometric variables were measured in specimens from the reptile collection of the Instituto de Ciencias Naturales, Universidad Nacional, Colombia. The study included individuals from seven different highland localities. We found size and shape sexual dimorphism, both of which varied among localities. Patterns of variation in body proportions among populations were different in both males and females, suggesting that either sexual or natural selective factors are different in each locality and between sexes. Since this species exhibits a fragmented distribution in highlands, genetic divergence may also be a causal factor of the observed variation. Ecological, behavioral, additional morphological as well as phylogenetic data, may help to understand the evolutionary processes behind the geographic patterns found in this species.

DOE Office of Scientific and Technical Information (OSTI.GOV)

Sarta, Jose A.; Castiblanco, Luis A

With cooperation of the International Atomic Energy Agency (IAEA) and the Department of Energy (DOE) of the United States, several calculations and tasks related to the waste disposal of spent MTR fuel enriched nominally to 93% were carried out for the conversion of the IAN-R1 Research Reactor from MTR-HEU fuel to TRIGA-LEU fuel. In order to remove the spent MTR-HEU fuel of the core and store it safely a program was established at the Instituto de Ciencias Nucleares y Energias Alternativas (INEA). This program included training, acquisition of hardware and software, design and construction of a decay pool, transfer ofmore » the spent HEU fuel elements into the decay pool and his final transport to Savannah River in United States. In this paper are presented data of activities calculated for each relevant radionuclide present in spent MTR-HEU fuel elements of the IAN-R1 Research Reactor and the total activity. The total activity calculated takes in consideration contributions of fission, activation and actinides products. The data obtained were the base for shielding calculations for the decay pool concerning the storage of spent MTR-HEU fuel elements and the respective dosimetric evaluations in the transferring operations of fuel elements into the decay pool.« less

DOE Office of Scientific and Technical Information (OSTI.GOV)

Di Prinzio, Renato; Almeida, Carlos Eduardo de; Laboratorio de Ciencias Radiologicas-Universidade do Estado do Rio de Janeiro

In Brazil there are over 100 high dose rate (HDR) brachytherapy facilities using well-type chambers for the determination of the air kerma rate of {sup 192}Ir sources. This paper presents the methodology developed and extensively tested by the Laboratorio de Ciencias Radiologicas (LCR) and presently in use to calibrate those types of chambers. The system was initially used to calibrate six well-type chambers of brachytherapy services, and the maximum deviation of only 1.0% was observed between the calibration coefficients obtained and the ones in the calibration certificate provided by the UWADCL. In addition to its traceability to the Brazilian Nationalmore » Standards, the whole system was taken to University of Wisconsin Accredited Dosimetry Calibration Laboratory (UWADCL) for a direct comparison and the same formalism to calculate the air kerma was used. The comparison results between the two laboratories show an agreement of 0.9% for the calibration coefficients. Three Brazilian well-type chambers were calibrated at the UWADCL, and by LCR, in Brazil, using the developed system and a clinical HDR machine. The results of the calibration of three well chambers have shown an agreement better than 1.0%. Uncertainty analyses involving the measurements made both at the UWADCL and LCR laboratories are discussed.« less

[Scientific output on transsexuality in the Spanish biomedical literature: bibliometric and content analyses (1973-2011)].

PubMed

Navarro-Pérez, Patricia; Ortiz-Gómez, Teresa; Gil-García, Eugenia

2015-01-01

To explore the scientific output on transsexuality in the Spanish biomedical literature between 1973 and 2011, through bibliometric and content analyses. We carried out a descriptive, cross-sectional study of Spanish biomedical articles on transsexuality published between 1973 and 2011. The data sources consisted of Índice Médico Español and ISOC-Ciencias Sociales y Humanidades. Bibliometric and content analyses were performed. A total of 65 papers were analyzed. Knowledge on transsexuality in Spain began to appear in medical journals between 1973 and 1984. A decade of intense productivity began in 1996 and the number of journals publishing articles on transsexuality multiplied in the following years. Until 2006, the year with the most biomedical productivity, biomedical discourses reproduced representations of transsexuality anchored in biological determinism. From 2008-2011, professionals writing on the topic incorporated feminist theories and social perspectives in their discourses. In the last quarter of the twentieth century, the dominant medical discourse considered manifestations of transsexual people from a biologist perspective that conceives transsexuality as a configuration mismatch between sex and gender. The emergence of new identity categories and medical reflection from non-essentialist and non-normative gender perspectives has improved the clinical management of transsexuality. Copyright © 2014 SESPAS. Published by Elsevier Espana. All rights reserved.

Ab initio study of boron nitride lines on graphene

NASA Astrophysics Data System (ADS)

Mata-Carrizal, Berenice; Sanginés-Mendoza, Raúl; Martinez, Edgar

2013-03-01

Graphene has unusual electronic properties which make it a promising material for electronic devices. Neverthless, the absence of a band gap sets limitations on its practical applications. Thus, it is crucial to find methods to create and tune the band gap of systems based on graphene. In this way, we explore the modulation of the electronic properties of graphene through doping with boron nitride lines. In particular, we studied the electronic structure of graphene sheets doped with boron nitride lines armchair and zigzag type. The calculations were performed using the pseudopotential LCAO method with a Generalized Gradient Approximation (GGA) for the exchange-correlation energy functional. We found that both doping lines type induce a bandgap and that the energy gap increases as the length of doping lines increases. Accordingly to our DFT calculations, we found that the energy gap on graphene doped with armchair and zigzag lines is due to a two different mechanisms to drain charge from pi- to sigma- orbitals. Thus, we found that doping graphene with boron nitride lines is a useful way to induce and modulate the bandgap on graphene. This research was supported by Consejo Nacional de Ciencia y Tecnología (Conacyt) under Grant No. 133022.

Large Scale Variability Survey of Orion II: mapping the young, low-mass stellar populations

NASA Astrophysics Data System (ADS)

Briceño, C.; Calvet, N.; Hartmann, L. W.; Vivas, A. K.

2000-12-01

We present further results of our ongoing large scale variability survey of the Orion OB1 Association, carried out with the 8k x 8k CCD Mosaic Camera on the 1m Schmidt telescope at the Venezuela National Observatory. In an area of over 60 square degrees we have unveiled new populations of low-mass young stars over a range of environments, from the dense molecular clouds of the Orion belt region, Ori OB 1b, to areas devoid of gas in Orion OB 1a. These new young stars span ages from 1-2 Myr in Ori OB 1b to roughly 10 Myr in Ori OB 1a, a likely scenario of sequential star formation triggered by the first generation of massive stars. Proxy indicators like Hα emission and near-IR excesses show that accretion from circumstellar disks in the 10 Myr stars of Ori OB 1a has mostly stopped. This population is a numerous analog of groups like TW Hya, making it an excellent laboratory to look for debris disks and study the epoch of planet formation in sparse, non-clustered environments. Research reported herein funded by NSF grant No. 9987367, and by CONICIT and Ministerio de Ciencia y Tecnología, Venezuela.

Tedese Project

NASA Astrophysics Data System (ADS)

Buforn, E.; Davila, J. Martin; Bock, G.; Pazos, A.; Udias, A.; Hanka, W.

The TEDESE (Terremotos y Deformacion Cortical en el Sur de España) project is a joint project of the Universidad Complutense de Madrid (UCM) and Real Instituto y Observatorio de la Armada de San Fernando, Cadiz (ROA) supported by the Spanish Ministerio de Ciencia y Tecnologia with the participation of the GeoforschungZen- trum, Potsdam (GFZ). The aim is to carry out a study of the characteristics of the oc- currence and mechanism of earthquakes together with measurements of crustal struc- ture and deformations in order to obtain an integrated evaluation of seismic risk in southern Spain from. As part of this project a temporal network of 10 broad-band seismological stations, which will complete those already existing in the zone, have been installed in southern Spain and northern Africa for one year beginning in October 2001. The objectives of the project are the study in detail of the focal mechanisms of earthquakes in this area, of structural in crust and upper mantle, of seismic anisotropy in crust and mantle as indicator for tectonic deformation processed and the measure- ments of crustal deformations using techniques with permanent GPS and SLR stations and temporary GPS surveys. From these studies, seismotectonic models and maps will be elaborated and seismic risk in the zone will be evaluated.

INTRODUCTION: 26th EGAS Conference of the European Group for Atomic Spectroscopy

NASA Astrophysics Data System (ADS)

Corbalán, R.; Orriols, G.; Pi, F.

1995-01-01

The 26th conference of EGAS, the European Group for Atomic Spectroscopy, was held in Bellaterra (Barcelona), Spain, 12-15 July 1994. The conference was hosted by the Departament de Física, Universitat Autònoma de Barcelona, and brought together 216 participants from 29 countries. The program comprised 14 survey lectures by invited speakers and 230 contributed papers (45 oral and 185 posters). Applications of atomic spectroscopy are taking an increasingly important place in the EGAS conferences. This year a Symposium on Spectroscopy for Environmental Analysis was held during the meeting. Six of the survey lectures were presented at this Symposium. Thirteen of the invited lectures have been prepared for publication by the authors and are gathered in the present issue of Physica Scripta. The conference organizers thank all sponsors, especially the Spanish Direccción General de Investigación Científica y Técnica (DGICYT) and the Comisión Interministerial de Ciencia y Tecnología (CICYT), the Direcció General de Recerca (DGR) of the Generalitat de Catalunya, the Fundació Catalana per la Recerca, the Universitat Politècnica de Catalunya and the International Science Foundation (ISF), for supporting the 26th EGAS meeting.

Terahertz Photoresponse of a Single InAs Quantum Wire

NASA Astrophysics Data System (ADS)

Peralta, X. G.; Allen, S. J.; Kono, J.; Sakaki, H.; Sugihara, T.; Sasa, S.; Inoue, M.

1997-03-01

The terahertz (THz) photoresponse of a single InAs quantum wire in a high magnetic field has been studied as a function of frequency, polarization and THz field strength. The wire was fabricated by wet chemical etching of a InAs/AlGaSb single quantum well with a mobility of 92000 cm^2/Vs and a density of 7.3x10^11 cm-2. The length of the wire is 2 μm. At high THz field strength , we observe non-resonant heating of the quasi-1-D electron gas in the wire which produces a temperature modulation of the Shubnikov-de Haas oscillations. While the period of the oscillations is independent of THz polarization and frequency, the magnetic field dependent amplitude depends on THz polarization. At low THz power a resonant peak whose position depends on THz frequency is identified as a magnetoplasmon in the single wire. We project the low power results on models of 1-D magnetoplasma oscillations. We are particularly interested in excitations at high terahertz field strength which are beyond the scope of exisiting models. This work is supported by ONR, QUEST and NSF Science and Technology Center, Japan Science and Technology Corporation and Consejo Nacional de Ciencia y Tecnología, México.

Ozone production using dielectric barrier discharge in oxygen and carbon dioxide

NASA Astrophysics Data System (ADS)

Pontiga, Francisco; Abidat, Roukia; Moreno, Helena; Agustín, Fernández-Rueda; Rebiaï, Saida

2015-09-01

The generation of ozone in oxygen and carbon dioxide using a planar dielectric barrier discharge (DBD) has been experimentally investigated. The DBD reactor was operated at moderate voltages (4.2 to 5.6 kV) and frequencies (50 to 500 Hz) and the gas flow rate was varied in the range 50 to 200 cm3/min. The averaged consumed power (<1 W) was evaluated using a monitor capacitor of known capacitance (1 μF). The effluent gas from the DBD reactor was diverted to a gas cell situated inside the sample compartment of a UV spectrophotometer. Therefore, ozone concentration was determined from the measurement of absorbance using Beer-Lambert law. The results have shown that ozone concentration in oxygen grows very linearly with the input power. In contrast, the production of ozone in carbon dioxide is less regular, which may be due to the deposition of a thin layer over the stainless steel electrode during the application of the electrical discharge. Moreover, the rate of ozone production with the injected energy density was found to be 500 times weaker in carbon dioxide than in pure oxygen. This work was supported by the Spanish Government Agency ``Ministerio de Ciencia e Innovación'' under Contract No. FIS2011-25161.

Parathyroid cysts: the Latin-American experience

PubMed Central

Aristizábal, Natalia; Aguilar, Carolina; Palacios, Karen; Pérez, Juan Camilo; Vélez-Hoyos, Alejandro; Duque, Carlos Simon; Sanabria, Alvaro

2016-01-01

Background Parathyroid cyst is an infrequent and unsuspected disease. There are more than 300 hundred cases reported in the world literature, a few of them are from Latin America. The experience of our centers and a review of the cases are presented. Methods Case report of a series of patients with parathyroid cyst from our institutions according to the CARE guidelines (Case Reports). A search of Medline, Embase, BIREME (Biblioteca Regional de Medicina) LILACS (Literatura Latinoamericana y del Caribe en Ciencias de la Salud), Google Scholar and Scielo (Scientific Electronic Library on Line) databases and telephonic or email communications with other experts from Latin-America was performed . Results Six patients with parathyroid cyst were found in our centers in Colombia. Most of them were managed with aspiration of the cyst. Two of them required surgery. Only one case was functional. Twelve reports from Latin America were found for a total of 18 cases in our region adding ours. Conclusions Parathyroid cysts are uncommonly reported in Latin America. Most of them are diagnosed postoperatively. Suspicion for parathyroid cyst should be raised when a crystal clear fluid is aspirated from a cyst. The confirmation of the diagnosis may be easily done if parathyroid hormone (PTH) level is measured in the cyst fluid. PMID:28149800

Phonon renormalization and anharmonicity in Al-doped MgB2

NASA Astrophysics Data System (ADS)

Ortiz, Filiberto; Aguayo, Aarón

2005-03-01

We have studied the evolution of the E2g phonon mode dynamics in Mg1-xAlxB2 as a function of doping using the Frozen Phonon Approximation (FPA). The doping was modeled in the ab-initio Virtual Crystal Approximation (VCA). The results were obtained by means of first-principles total-energy calculations using the full potential Linearized Augmented Plane Wave (LAPW) method and the Generalized Gradient Approximation (GGA) for the exchange-correlation potential. We present results for the evolution of the phonon frequency and anharmonicity of the E2g mode as a function of Al concentration (x). From a comparison of the experimental data with the calculated E2g phonon frequency we show that the VCA-FPA reproduces the observed phonon renormalization in the whole range of Al concentrations. More interestingly, we find that the anharmonicity gradually decreases with Al doping and vanishes for x(Al)>0.5, that behaviour correlates with the evolution of the measured Raman linewidth in Al-doped MgB2. The significance of these results are discussed in the light of the experimentally observed loss of superconductivity in Mg1- xAlxB2.This work was supported by Consejo Nacional de Ciencia y Tecnolog'ia (CONACYT, M'exico) under Grant. No. 43830-F.

La ciencia en la vida actual. Volumen I. Edicion para el maestro (Science in Everyday Life. Volume I. Teacher Edition). Applied Basic Curriculum Series.

ERIC Educational Resources Information Center

Evaluation, Dissemination and Assessment Center, Dallas.

This guide, the first in a series of three, provides the Spanish-speaking intermediate science student and teacher an opportunity to review selected science concepts and processes through activities which emphasize the applicability of scientific knowledge in the professional world. The three components in this guide deal with (1) ecology (what…

La ciencia en la vida actual. Volumen II. Edicion para el maestro (Science in Everyday Life. Volume II. Teacher Edition). Applied Basic Curriculum Series.

ERIC Educational Resources Information Center

Evaluation, Dissemination and Assessment Center, Dallas.

This guide, the second in a series of three, provides the Spanish-speaking intermediate science student and teacher an opportunity to review selected science concepts and processes through activities which emphasize the applicability of scientific knowledge in the professional world. This guide is divided into three components. The first component…

[Surgical treatment of lower digestive tract hemorrhage. Experience at the Instituto Nacional de Ciencias Médicas y Nutrición Salvador Zubirán].

PubMed

García-Osogobio, Sandra; Remes-Troche, José María; Takahashi, Takeshi; Barreto Camilo, Juan; Uscanga, Luis

2002-01-01

Lower gastrointestinal bleeding is usually self-limiting in about 80% of cases; however, surgical treatment may be required in selected cases. Preoperative precise identification of the bleeding source is crucial for a successful outcome. To determine the most frequent diagnoses, as well as short and long-term results in a series of patients who underwent a surgical procedure for lower gastrointestinal bleeding. Retrospective analysis of 39 patients operated upon for lower gastrointestinal bleeding from 1979 through 1997 in a referral center. Demographic data, history, physical examination, laboratory tests, resuscitative measures, preoperative work-up for identification of bleeding source, definitive cause of bleeding, surgical procedure, operative morbidity and mortality, as well as long-term status and recurrence of bleeding were recorded. There were 54% women and 46% men. Mean age was 56 years (range, 15-92). Most patients presented hematochezia (69%). Colonoscopy was the most used diagnostic procedure (69%). The bleeding source was located in 90% of patients. Diverticular disease was the most frequent cause of bleeding. A segmental bowel resection was the treatment in 97% of cases. Morbidity was 23% with 18% of mortality. Recurrence occurred in 9% of survivors. Morbidity and mortality were high. Patients who require a surgical operation should be carefully selected and evaluated with a complete work-up to determine the site and cause of bleeding.

La ciencia en la vida actual. Volumen III. Edicion para el maestro (Science in Everyday Life. Volume III. Teacher Edition). Applied Basic Curriculum Series.

ERIC Educational Resources Information Center

Evaluation, Dissemination and Assessment Center, Dallas.

This guide, the third in a series of three, provides the Spanish-speaking intermediate science student and teacher an opportunity to review selected science concepts and processes through activities which emphasize the applicability of scientific knowledge in the professional world. The three components in this guide deal with (1) the scientific…

Reformulation of Engineering Education at Undergraduate Level in the Faculdad de Ingenieria y Ciencias Hidricas Universidad Nacional del Litoral--Water Resources and Engineering Degrees.

ERIC Educational Resources Information Center

Theiler, Julio; Isla, Miguel; Arrillaga, Hugo; Ceirano, Eduardo; Lozeco, Cristobal

This paper explains the educational changes in the Water Resources Engineering program offered by the Universidad Nacional del Litoral in Santa Fe, Argentina, for the last 20 years at the undergraduate level. The need for modernizing the engineering teaching program occurred due to changes in the social system in which the concepts of development…

Learning Partners: Escribamos! Leamos! Juguemos a las Ciencias! Juguemos a las Matematicas! (Learning Partners: Let's Write! Let's Read! Let's Play Mathematics! Let's Play Science!)

ERIC Educational Resources Information Center

Office of Educational Research and Improvement (ED), Washington, DC.

This Spanish-language document consists of four single-sheet sets of guidelines developed by the Family Involvement Partnership for Learning to assist parents in facilitating their children's elementary school success. The front part of the sheets describes general ways parents can support their children, including modeling writing, reading aloud,…

Earth and Heavens: Two Separate Universes? (Spanish Title: Tierra y Cielos: ¿Dos Universos Separados?) Terra e Céus: Dois Universos Separados?

NASA Astrophysics Data System (ADS)

Carrascosa, Jaime; Gil-Pérez, Daniel; Solbes, Jordi; Vilches, Amparo

2005-12-01

The study of gravitation constitutes an exceptional occasion to show the richness and complexity of science and technology, contemplating, among other things: the problematic situations which are at the heart of the scientific knowledge, the difficulties encountered in the construction of knowledge and, especially, the necessity of overcoming "common-sense evidence" that proclaimed the existence of an insurmountable barrier between Earth and Heavens, hindering scientific development during many centuries. In this paper we present a program of activities to orient the study of Gravitation atUpperHigh School, favoring students' participation in the reconstruction of this first scientific revolution and giving them the opportunity to see the importance of Astronomy both in the history of science and today. El estudio de la gravitación constituye una ocasión excepcional para mostrar la ciencia y la tecnología en toda su riqueza y complejidad, considerando, entre otros aspectos:

PASCOS 2012 - 18th International Symposium on Particles Strings and Cosmology

NASA Astrophysics Data System (ADS)

2014-03-01

The XVII International Conference on Strings, Particles and Cosmology, PASCOS 2012, was held in the City of Mérida, Mexico, from June 3-8, 2012. The conference series is aimed at exploring the interface and interplay between particle physics, string theory and cosmology. With the advent of new data, the emphasis of the XVIII edition of PASCOS was on phenomenology and the interpretation of recent observational and experimental results. The conference followed the format of previous conferences in this series, with plenary reviews and contributed presentations in parallel sessions. The lectures covered a wide range of subjects which included: Dark matter and dark energy, flavor physics and CP violation, neutrino physics, supersymmetry, Higgs physics, baryogenesis and EDMs, supergravity, high energy cosmic rays, string and F-theory GUTs, and string phenomenology. This is the first time that PASCOS was held in Latin America. The aim to do it in Mexico was to engage the Latin American community and thus to bring the conference to a wider and different audience, a goal which was thoroughly achieved. The venue was held at the Hotel Fiesta Americana in the beautiful city of Mérida. The social events included a reception with typical local food at the Katun restaurant, conference dinner at the historical Quinta Montes Molina, and an excursion to the archeological site of Dzibilchaltún including a swim at the famous cenote. PASCOS 2012 was possible thanks to the generous support of the following sponsors: CONACyT (Consejo Nacional de Ciencia y Tecnología), UNAM (Universidad Nacional Autónoma de México: Consejo Técnico de la Investigación Científica, Instituto de Ciencias Nucleares, Instituto de Física), Cinvestav, (Centro de Estudios Avanzados del IPN: U. Zacatanco, U. Mérida and Secretaría General), ICyTDF (Instituto Científico y Tecnológico del D.F.), PIFI (Programa Integral de Fortalecimiento Institucional, Universidad de Guanajuato, Campus León), SMF

Galaxy populations in the Antlia cluster - III. Properties of faint early-type galaxies

NASA Astrophysics Data System (ADS)

Smith Castelli, Analía. V.; Cellone, Sergio A.; Faifer, Favio R.; Bassino, Lilia P.; Richtler, Tom; Romero, Gisela A.; Calderón, Juan Pablo; Caso, Juan Pablo

2012-01-01

distribution of the member sample confirms the existence of two groups in Antlia, each one dominated by a giant elliptical galaxy and with one cE located close to each giant. Size and position, with respect to massive galaxies, of the dSph candidates are estimated and compared to Local Group counterparts. Based on observations carried out at the Cerro Tololo Inter-American Observatory (Chile), at Las Campanas Observatory (Chile) and at the European Southern Observatory, Paranal (Chile). Also based on observations obtained at the Gemini Observatory, which is operated by the Association of Universities for Research in Astronomy, Inc., under a cooperative agreement with the NSF on behalf of the Gemini partnership: the National Science Foundation (United States), the Science and Technology Facilities Council (United Kingdom), the National Research Council (Canada), CONICYT (Chile), the Australian Research Council (Australia), Ministerio da Ciencia e Tecnologia (Brazil) and Ministerio de Ciencia, Tecnología e Innovación Productiva (Argentina).

Mixed-Methods Study that Examines Nine Science Teachers' Perceptions of Slooh Robotic Telescope for Teaching Astronomy. (Breton Title: Métodos Mistos de Estudo que Examinam a Percepção de Nove Professores de Ciências sobre o Telescópio Robótico Slooh Para Ensino de Astronomia.) Métodos Mixtos de Estudio que Examinan la Percepcion de Nueve Profesores de Ciencias sobre EL Telescopio Robótico Slooh Para la Enseñanza de la Astronomía

NASA Astrophysics Data System (ADS)

Gershun, Daniel C.; Slater, Timothy F.; Berryhill, Katie J.

2014-07-01

ção em sala de aula", "Impacto no Instrutor" e "Questões logísticas". A análise desses temas sugere que Slooh pode proporcionar um ambiente de aprendizagem interativo e social com capacidade de incorporar temas interdisciplinares. Aunque estudios previos muostraron que los telescopios robóticos tienen el potencial de mejorar el aprendizaje del estudiante, hay relativamente poca investigación centrada en las percepciones de lós profesores respecto de esta tecnología. Este estudio investiga: "¿cuál es el mérito académico de la utilización de telescopios robóticos SLOOH para enseñar astronomía según la percepción de los profesores de ciências?" Nuestra muestra está formada por nueve profesores de ciencias de estudiantes entre 13 a 18 años pre-y post-tests, entrevistas, y. encuestas se recogieron durante dos semanas de un curso on-line de verano sobre los telescopios robóticos. Si bien lós tests antes y después de las pruebas no revelaron un aumento estadísticamente significativo en el conocimiento de contenido astronómico, el análisis de lós datos cualitativos reveló cinco temas que describen los aspectos más importantes de la utilización de SLOOH de acuerdo con los participantes:. "Imágenes", "Interface", "aplicación en el aula", "Impacto en el Instructor" y "problemas logísticos" . El análisis de estos temas sugiere que SLOOH puede proporcionar un ambiente de aprendizaje interactivo y social, con capacidad para incorporar temas transversales.

Guia para la Ensenanza Combinada de Ingles y Ciencia. Para Padres/sobre Padres. (A Guide to Teaching English and Science Together. For Parents/about Parents).

ERIC Educational Resources Information Center

Schwartz, Wendy

In the past, students who knew only a little English (called limited English proficient, or LEP), were usually taught only low-level science and mathematics. Now, new science and mathematics teaching methods can help LEP students get a good education in both fields. This guide will help parents know if their children are learning as much as…

El uso de las simulaciones educativas en la ensenanza de conceptos de ciencias y su importancia desde la perspectiva de los estudiantes candidatos a maestros

NASA Astrophysics Data System (ADS)

Crespo Ramos, Edwin O.

This research was aimed at establishing the differences, if any, between traditional direct teaching and constructive teaching through the use of computer simulations and their effect on pre-service teachers. It's also intended to gain feedback on the users of these simulations as providers of constructive teaching and learning experiences. The experimental framework used a quantitative method with a descriptive focus. The research was guided by two hypothesis and five inquiries. The data was obtained from a group composed of twenty-nine students from a private Metropolitan University in Puerto Rico and elementary school pre-service teachers. They were divided into two sub-groups: experimental and control. Two means were used to collect data: tests and surveys. Quantitative data was analyzed through test "t" for paired samples and the non-parametric Wilcoxon test. The results of the pre and post tests do not provide enough evidence to conclude that using the simulations as learning tools was more effective than traditional teaching. However, the quantitative results obtained were not enough to reject or dismiss the hypothesis Ho1. On the other hand, an overall positive attitude towards these simulations was obtained from the surveys. The importance of including hands-on activities in daily lesson planning was proven and well recognized among practice teachers. After participating and working with these simulations, the practice teachers expressed being convinced that they would definitely use them as teaching tools in the classroom. Due to these results, hypothesis Ho2 was rejected. Evidence also proved that practice teachers need further professional development to improve their skills in the application of these simulations in the classroom environment. The majority of these practice teachers showed concern about not being instructed on important aspects of the use of simulation as part of their college education curriculum towards becoming teachers.

Extreme ultraviolet spectroscopy of low pressure helium microwave driven discharges

NASA Astrophysics Data System (ADS)

Espinho, Susana; Felizardo, Edgar; Tatarova, Elena; Alves, Luis Lemos

2016-09-01

Surface wave driven discharges are reliable plasma sources that can produce high levels of vacuum and extreme ultraviolet radiation (VUV and EUV). The richness of the emission spectrum makes this type of discharge a possible alternative source in EUV/VUV radiation assisted applications. However, due to challenging experimental requirements, publications concerning EUV radiation emitted by microwave plasmas are scarce and a deeper understanding of the main mechanisms governing the emission of radiation in this spectral range is required. To this end, the EUV radiation emitted by helium microwave driven plasmas operating at 2.45 GHz has been studied for low pressure conditions. Spectral lines from excited helium atoms and ions were detected via emission spectroscopy in the EUV/VUV regions. Novel data concerning the spectral lines observed in the 23 - 33 nm wavelength range and their intensity behaviour with variation of the discharge operational conditions are presented. The intensity of all the spectral emissions strongly increases with the microwave power delivered to the plasma up to 400 W. Furthermore, the intensity of all the ion spectral emissions in the EUV range decreases by nearly one order of magnitude as the pressure was raised from 0.2 to 0.5 mbar. Work funded by FCT - Fundacao para a Ciencia e a Tecnologia, under Project UID/FIS/50010/2013 and grant SFRH/BD/52412/2013 (PD-F APPLAuSE).

Discovery of Three Pulsating, Mixed-atmosphere, Extremely Low-mass White Dwarf Precursors

NASA Astrophysics Data System (ADS)

Gianninas, A.; Curd, Brandon; Fontaine, G.; Brown, Warren R.; Kilic, Mukremin

2016-05-01

We report the discovery of pulsations in three mixed-atmosphere, extremely low-mass white dwarf (ELM WD, M ≤slant 0.3 M ⊙) precursors. Following the recent discoveries of pulsations in both ELM and pre-ELM WDs, we targeted pre-ELM WDs with mixed H/He atmospheres with high-speed photometry. We find significant optical variability in all three observed targets with periods in the range 320-590 s, consistent in timescale with theoretical predictions of p-mode pulsations in mixed-atmosphere ≈0.18 M ⊙ He-core pre-ELM WDs. This represents the first empirical evidence that pulsations in pre-ELM WDs can only occur if a significant amount of He is present in the atmosphere. Future, more extensive, timeseries photometry of the brightest of the three new pulsators offers an excellent opportunity to constrain the thickness of the surface H layer, which regulates the cooling timescales for ELM WDs. Based on observations obtained at the Gemini Observatory, which is operated by the Association of Universities for Research in Astronomy, Inc., under a cooperative agreement with the NSF on behalf of the Gemini partnership: the National Science Foundation (United States), the National Research Council (Canada), CONICYT (Chile), Ministerio de Ciencia, Tecnología e Innovación Productiva (Argentina), and Ministério da Ciência, Tecnologia e Inovação (Brazil).

Analysis of Wedge-like Response in Mexico City during the September 19th, 2017 Puebla-Morelos Earthquake

NASA Astrophysics Data System (ADS)

Baena-Rivera, M.; Sanchez-Sesma, F. J.; Ramirez-Guzman, L.

2017-12-01

The September 19th, 2017 Puebla-Morelos earthquake (Mw7.1) caused severe structural and nonstructural damage in Mexico City in the Transition and border of the Lake geotechnical zones. Previously recorded ground motion had not reached similar high intensities. The Transition zone surrounds the base of mountain ranges and is composed of alluvial sands and silts, limited by layers of hard soil of the Hill Zone and highly compressible clay deposits of the Lake Zone. These transition configurations are modeled as dipping layers where the soft sediments progressively thicken away from the edge.We present a preliminary analysis of 2D SH and P-SV dipping layer models with homogeneous and lateral variations that resemble the known structure of the basin. Our results show the emergence of surface waves in the edges, and the spread of the energy, broadening the frequency range as compared to 1D models. The latter is a plausible explanation of the frequency content in the recorded ground motion in sites of observed damage. Acknowledgments: Records used in this research are obtained, processed and maintained by the Seismic Instrumentation Unit of the Institute of Engineering at the National Autonomous University of Mexico. This Project was funded by the Secretaría de Ciencia, Tecnología e Innovación (SECITI) of Mexico City. Project SECITI/073/2016.

Determinations of the 12C/13C Ratio for the Secondary Stars of AE Aquarii, SS Cygni, and RU Pegasi

NASA Astrophysics Data System (ADS)

Harrison, Thomas E.; Marra, Rachel E.

2017-07-01

We present new moderate-resolution near-infrared spectroscopy of three CVs obtained using GNIRS on Gemini-North. These spectra covered three 13CO bandheads found in the K-band, allowing us to derive the isotopic abundance ratios for carbon. We find small 12C/13C ratios for all three donor stars. In addition, these three objects show carbon deficits, with AE Aqr being the most extreme ([C/Fe] = -1.4). This result confirms the conjecture that the donor stars in some long-period CVs have undergone considerable nuclear evolution prior to becoming semi-contact binaries. In addition to the results for carbon, we find that the abundance of sodium is enhanced in these three objects, and the secondary stars in both RU Peg and SS Cyg suffer magnesium deficits. Explaining such anomalies appears to require higher mass progenitors than commonly assumed for the donor stars of CVs. Based on observations obtained at the Gemini Observatory, which is operated by the Association of Universities for Research in Astronomy, Inc., under a cooperative agreement with the NSF on behalf of the Gemini partnership: the National Science Foundation (United States), the National Research Council (Canada), CONICYT (Chile), Ministerio de Ciencia, Tecnología e Innovación Productiva (Argentina), and Ministério da Ciência, Tecnologia e Inovação (Brazil).

The leading-edge vortex of swift-wing shaped delta wings

NASA Astrophysics Data System (ADS)

Muir, Rowan; Arredondo-Galeana, Abel; Viola, Ignazio Maria

2017-11-01

Recent investigations on the aerodynamics of natural fliers have illuminated the significance of the Leading-Edge Vortex (LEV) for lift generation in a variety of flight conditions. In this investigation, a model non-slender delta shaped wing with a sharp leading-edge is tested at low Reynolds Number, along with a delta wing of the same design, but with a modified trailing edge inspired by the wing of a common swift Apus apus. The effect of the tapering swift wing on LEV development and stability is compared with the flow structure over the un-modified delta wing model through particle image velocimetry. For the first time, a leading-edge vortex system consisting of a dual or triple LEV is recorded on a swift-wing shaped delta wing, where such a system is found across all tested conditions. It is shown that the spanwise location of LEV breakdown is governed by the local chord rather than Reynolds Number or angle of attack. These findings suggest that the trailing-edge geometry of the swift wing alone does not prevent the common swift from generating an LEV system comparable with that of a delta shaped wing. This work received funding from the Engineering and Physical Sciences Research Council [EP/M506515/1] and the Consejo Nacional de Ciencia y Tecnología (CONACYT).

A Refined Radial Velocity Curve for the L Dwarf Donor of WZ Sagittae

NASA Astrophysics Data System (ADS)

Harrison, Thomas E.

2017-12-01

We have obtained a radial velocity curve for the L dwarf donor in WZ Sagittae using phase-resolved J-band spectra obtained with GNIRS on Gemini-north. We find a radial velocity semi-amplitude of {K}2=525+/- 11 {km} {{{s}}}-1. This result reduces the error bar by a factor of three over previous attempts. A relatively strong, unidentified emission line centered near 1.177 μm, corrupts the blue K i doublet in these data. While an H i emission feature near 1.2527 μm distorts the depth of the red K i doublet. In addition, a weak H i emission line at 1.1969 μm falls in the middle of the strongest FeH feature in these spectra. The combination of these contaminants prevents us from precisely constraining the spectral type of the donor. The strength of the absorption features remains consistent with an early L spectral type. Based on observations obtained at the Gemini Observatory, which is operated by the Association of Universities for Research in Astronomy, Inc., under a cooperative agreement with the NSF on behalf of the Gemini partnership: the National Science Foundation (United States), the National Research Council (Canada), CONICYT (Chile), Ministerio de Ciencia, Tecnología e Innovación Productiva (Argentina), and Ministério da Ciência, Tecnologia e Inovação (Brazil).

The role of Hund's coupling in the correlations and the nematicity of iron superconductors

NASA Astrophysics Data System (ADS)

Bascones, Elena

Since their discovery in 2008 the strength and the nature of correlations in iron superconductors have been widely discussed. Understanding the correlations is key to unveil the nature of the superconducting, nematic and magnetic instabilities which appear in the phase diagram. Due to their multi-orbital character, correlations in iron superconductors are strongly affected by Hund's coupling and these materials have been classified by some authors as Hund metals. For a long time there has been a strong controversy on the nature of correlations induced by Hund's coupling and its relation to Mott physics. While some authors describe Hund metals as strongly correlated systems which are not in proximity to a Mott insulating state, others, have described iron superconductors as doped Mott insulators. In the talk, after some introduction, I will first show our recent results which show that while the spin polarization of the atoms, promoted by Hund's coupling induces strong correlations, this does not necessary mean that the total charge is more localized. On the contrary, in some cases this polarization promotes itinerancy. I will then present a generic framework to address the correlations in iron superconductors and discuss the role of Hund's coupling in the nematicity of iron superconductors, with special emphasis on FeSe. Funding from Ministerio de Ciencia y Tecnología FIS2011-29689, FIS2014-53219-P and Fundacion Ramon Areces.

Porphyrin-based polymeric nanostructures for light harvesting applications: Ab initio calculations

NASA Astrophysics Data System (ADS)

Orellana, Walter

The capture and conversion of solar energy into electricity is one of the most important challenges to the sustainable development of mankind. Among the large variety of materials available for this purpose, porphyrins concentrate great attention due to their well-known absorption properties in the visible range. However, extended materials like polymers with similar absorption properties are highly desirable. In this work, we investigate the stability, electronic and optical properties of polymeric nanostructures based on free-base porphyrins and phthalocyanines (H2P, H2Pc), within the framework of the time-dependent density functional perturbation theory. The aim of this work is the stability, electronic, and optical characterization of polymeric sheets and nanotubes obtained from H2P and H2Pc monomers. Our results show that H2P and H2Pc sheets exhibit absorption bands between 350 and 400 nm, slightly different that the isolated molecules. However, the H2P and H2Pc nanotubes exhibit a wide absorption in the visible and near-UV range, with larger peaks at 600 and 700 nm, respectively, suggesting good characteristic for light harvesting. The stability and absorption properties of similar structures obtained from ZnP and ZnPc molecules is also discussed. Departamento de Ciencias Físicas, República 220, 037-0134 Santiago, Chile.

Vortex Flipping in Superconductor-Ferromagnet Spin Valve Structures

NASA Astrophysics Data System (ADS)

Patino, Edgar J.; Aprili, Marco; Blamire, Mark; Maeno, Yoshiteru

2014-03-01

We report in plane magnetization measurements on Ni/Nb/Ni/CoO and Co/Nb/Co/CoO spin valve structures with one of the ferromagnetic layers pinned by an antiferromagnetic layer. In samples with Ni, below the superconducting transition Tc, our results show strong evidence of vortex flipping driven by the ferromagnets magnetization. This is a direct consequence of proximity effect that leads to vortex supercurrents leakage into the ferromagnets. Here the polarized electron spins are subject to vortices magnetic field occasioning vortex flipping. Such novel mechanism has been made possible for the first time by fabrication of the F/S/F/AF multilayered spin valves with a thin-enough S layer to barely confine vortices inside as well as thin-enough F layers to align and control the magnetization within the plane. When Co is used there is no observation of vortex flipping effect. This is attributed to Co shorter coherence length. Interestingly instead a reduction in pinning field of about 400 Oe is observed when the Nb layer is in superconducting state. This effect cannot be explained in terms of vortex fields. In view of these facts any explanation must be directly related to proximity effect and thus a remarkable phenomenon that deserves further investigation. Programa Nacional de Ciencias Basicas COLCIENCIAS (No. 120452128168).

Classification and management of bile duct injuries

PubMed Central

Mercado, Miguel Angel; Domínguez, Ismael

2011-01-01

To review the classification and general guidelines for treatment of bile duct injury patients and their long term results. In a 20-year period, 510 complex circumferential injuries have been referred to our team for repair at the Instituto Nacional de Ciencias Médicas y Nutrición “Salvador Zubirán” hospital in Mexico City and 198 elsewhere (private practice). The records at the third level Academic University Hospital were analyzed and divided into three periods of time: GI-1990-99 (33 cases), GII- 2000-2004 (139 cases) and GIII- 2004-2008 (140 cases). All patients were treated with a Roux en Y hepatojejunostomy. A decrease in using transanastomotic stents was observed (78% vs 2%, P = 0.0001). Partial segment IV and V resection was more frequently carried out (45% vs 75%, P = 0.2) (to obtain a high bilioenteric anastomosis). Operative mortality (3% vs 0.7%, P = 0.09), postoperative cholangitis (54% vs 13%, P = 0.0001), anastomosis strictures (30% vs 5%, P = 0.0001), short and long term complications and need for reoperation (surgical or radiological) (45% vs 11%, P = 0.0001) were significantly less in the last period. The authors concluded that transition to a high volume center has improved long term results for bile duct injury repair. Even interested and tertiary care centers have a learning curve. PMID:21528093

[Validity and reliability of the screening questionnaire for geriatric depression used in the Mexican Health and Age Study].

PubMed

Aguilar-Navarro, Sara Gloria; Fuentes-Cantú, Alejandro; Avila-Funes, José Alberto; García-Mayo, Emilio José

2007-01-01

To assess the validity and reliability of a geriatric depression questionnaire used in the Mexican Health and Age Study (MHAS). The study was conducted at the Instituto Nacional de Ciencias Médicas y Nutrición Salvador Zubirán (INCMNSZ) clinic from May 2005 to March 2006. This depression screening nine-item questionnaire was validated using the Diagnostic and Statistical Manual of Mental Disorders (DSM-IV-TR) (fourth revised version) and Yesavage's 15-item Geriatric Depression Scale (GDS-15) criteria. The instrument belongs to the MHAS, a prospective panel study of health and aging in Mexico. A total of 199 subjects 65 years of age and older participated in the validation process (median age= 79.5 years). MHAS questionnaire result was significantly correlated to the clinical depression diagnosis (p<0.001) and to the GDS-15 score (p<0.001). Internal consistency was adequate (alpha coefficient: 0.74). The cutoff point > or = 5/9 points yielded an 80.7% and 68.7% sensitivity and specificity respectively. The fidelity for the test retest was excellent (intra-class correlation coefficient= 0.933). Finally, the Bland and Altman agreement points indicated a difference 0.22 percent points between test retest. The MHAS questionnaire is valid and trustworthy, and allows screening in the research field for the presence of depression in the elderly.

Decrease in the Prevalence of Pancreatitis Associated with Primary Hyperparathyroidism: Experience at a Tertiary Referral Center.

PubMed

Janka-Zires, Marcela; Hernández-Calleros, Jorge; Gómez-Pérez, Francisco Javier; Uscanga-Domínguez, Luis Federico; Pelaez-Luna, Mario César; Almeda-Valdés, Paloma

2015-01-01

Hypercalcemia is a rare but well recognized cause of acute and chronic pancreatitis. Hypercalcemia-related pancreatitis is mainly caused by primary hyperparathyroidism. The prevalence of pancreatitis in hyperparathyroidism varies worldwide and additional disease-modifying factors may play a role in its development. In 1988 the prevalence of pancreatitis secondary to primary hyperparathyroidism at the Instituto Nacional de Ciencias Médicas y Nutrición Salvador Zubirán (INCMNSZ), a referral center in Mexico City, was 12.1% (95% CI: 6.7-21). To describe the current prevalence of pancreatitis secondary to primary hyperparathyroidism at the INCMNSZ. We reviewed 385 cases of primary hyperparathyroidism seen at the hospital between 1987 and 2012. 26 cases with acute or chronic pancreatitis associated with primary hyperparathyroidism were documented, with a prevalence of 6.7% (95% CI: 4.6-9.7), which was lower than the 12.1% previously reported. In the present study, 20% had a history of alcohol consumption, 10% of gallstones, and 20% of ureteral calculi, compared with the previously reported 32.0, 34.6, and 40.0%, respectively. The average calcium levels were 13.1 and 13.8 mg/dl in the previous and current series, respectively. We found a decrease in the prevalence of pancreatitis associated with primary hyperparathyroidism from 12.1% (95% CI: 6.7-21) to 6.7% (95% CI: 4.6-9.7).

Stochastic coalescence in finite systems: an algorithm for the numerical solution of the multivariate master equation.

NASA Astrophysics Data System (ADS)

Alfonso, Lester; Zamora, Jose; Cruz, Pedro

2015-04-01

The stochastic approach to coagulation considers the coalescence process going in a system of a finite number of particles enclosed in a finite volume. Within this approach, the full description of the system can be obtained from the solution of the multivariate master equation, which models the evolution of the probability distribution of the state vector for the number of particles of a given mass. Unfortunately, due to its complexity, only limited results were obtained for certain type of kernels and monodisperse initial conditions. In this work, a novel numerical algorithm for the solution of the multivariate master equation for stochastic coalescence that works for any type of kernels and initial conditions is introduced. The performance of the method was checked by comparing the numerically calculated particle mass spectrum with analytical solutions obtained for the constant and sum kernels, with an excellent correspondence between the analytical and numerical solutions. In order to increase the speedup of the algorithm, software parallelization techniques with OpenMP standard were used, along with an implementation in order to take advantage of new accelerator technologies. Simulations results show an important speedup of the parallelized algorithms. This study was funded by a grant from Consejo Nacional de Ciencia y Tecnologia de Mexico SEP-CONACYT CB-131879. The authors also thanks LUFAC® Computacion SA de CV for CPU time and all the support provided.

The lost honour of Henrietta Leavitt

NASA Astrophysics Data System (ADS)

Del Puerto, C.

2011-11-01

The first scene opens with the music of Shirley Bassey. The astronomer Henrietta Swan Leavitt is writing a diary when visited by the famous CBS reporter Edward Roscoe Murrow. Henrietta is surprised that this American television channel should want to pay such a tribute to her, but she agrees to be interviewed. Annie Jump Cannon, her friend and colleague from Harvard College Observatory, accompanies her during most of the sessions. Everything goes so well that the journalist tries to touch on certain issues that Henrietta seems to want to keep secret, such as her relationship with Edward Charles Pickering, Director of the Observatory, and the reason why she failed to get the recognition for her work that she deserved.This is the argument of the play The Lost Honor of Henrietta Leavitt, a project of the Museo de la Ciencia y el Cosmos (Museum of Science and the Cosmos), run by the Organismo Autonomo de Museos y Centros of Cabildo de Tenerife (Autonomous Organism of Museums and Centres of the island government, Cabildo of Tenerife), with funding from the Spanish Foundation for Science and Technology (FECYT) and designed for the International Year of Astronomy 2009. The play, written and directed by the author, Carmen del Puerto, has been staged eight times in Tenerife and Pamplona. The poster values this experience as a resource for scientific popularization.

First-Principles Study of the Jahn-Teller Distortion in the Ti1-XVXH2 and Zr1-XNbxH2 Alloys

NASA Astrophysics Data System (ADS)

Quijano, Ramiro; de Coss, Romeo; Singh, David

2008-03-01

The transition metal dihydrides TiH2 and ZrH2 present the fluorite structure (CaF2) at high temperature but undergoes a tetragonal distortion with c/a<1 at low temperature. Electronic band structure calculations have shown that TiH2 and ZrH2 in the cubic phase display a very flat band at the Fermi level. Thus the low temperature tetragonal distortion has been associated to a Jahn-Teller effect. In order to understand the role of band filling in controlling the structural instability of the transition metal dihydrides, we have performed a first-principles total energy study of the Ti1-XVxH2 and Zr1-xNbxH2 alloys. The calculations were performed using FP-LAPW method within the (DFT) and we use the GGA for exchange correlation functional energy. The critical concentration for which the Jahn-Teller effect is suppressed, was determined from the evolution of the tetragonal-cubic energy barrier. We discuss the electronic mechanism of the structural-instability, in terms of the band filling. From the obtained results we conclude that the tetragonal distortion in TiH2 and ZrH2 is not produced only by a Jahn-Teller Effect. This research was supported by Consejo Nacional de Ciencia y Tecnolog'ia (Conacyt) under Grant No. 43830-F.

PREFACE: XXIX International Conference on Photonic, Electronic, and Atomic Collisions (ICPEAC2015)

NASA Astrophysics Data System (ADS)

Díaz, C.; Rabadán, I.; García, G.; Méndez, L.; Martín, F.

2015-09-01

The 29th International Conference on Photonic, Electronic and Atomic Collisions (XXIX ICPEAC) was held at the Palacio de Congresos ''El Greco'', Toledo, Spain, on 22-28 July, 2015, and was organized by the Universidad Autónoma de Madrid (UAM) and the Consejo Superior de Investigaciones Científicas (CSIC). ICPEAC is held biannually and is one of the most important international conferences on atomic and molecular physics. The topic of the conference covers the recent progresses in photonic, electronic, and atomic collisions with matter. With a history back to 1958, ICPEAC came to Spain in 2015 for the very first time. UAM and CSIC had been preparing the conference for six years, ever since the ICPEAC International General Committee made the decision to hold the XXIX ICPEAC in Toledo. The conference gathered 670 participants from 52 countries and attracted 854 contributed papers for presentation in poster sessions. Among the latter, 754 are presented in issues 2-12 of this volume of the Journal of Physics Conference Series. In addition, five plenary lectures, including the opening one by the Nobel laureate Prof. Ahmed H. Zewail and the lectures by Prof. Maciej Lewenstein, Prof. Paul Scheier, Prof. Philip H. Bucksbaum, and Prof. Stephen J. Buckman, 62 progress reports and 26 special reports were presented following the decision of the ICPEAC International General Committee. Detailed write-ups of most of the latter are presented in issue 1 of this volume, constituting a comprehensive tangible record of the meeting. On the occasion of the International Year of Light (IYL2015) and with the support of the Fundación Española para la Ciencia y la Tecnología (FECYT), the program was completed with two public lectures delivered by the Nobel laureate Prof. Serge Haroche and the Príncipe de Asturias laureate Prof. Pedro M. Echenique on, respectively, ''Fifty years of laser revolutions in physics'rquot; and ''The sublime usefulness of useless science''. Also a

Assessing the Record of Anoxic/Dysoxic Events in Lower Aptian Cupido/La Peña Formations, Northeastern Mexico

NASA Astrophysics Data System (ADS)

Maurrasse, F. J.; Barragan-Manzo, R.; Ponton, C.

2008-05-01

-thick each that are remarkably devoid of benthic foraminifers. They occur at 5. 72 m, 11.45m and 29.6 m, respectively, below the La Peña Fm. Variations within the Cupido Fm are consistent with fluctuating high- productivity, well-oxygenated neritic environment punctuated by development of hypoxic to anoxic bottom waters (Maurrasse et al., 2006). These recurrent episodes of severe oxygen depletion fall within the time interval that may be correlational with the infrajacent D. deshayesi to possibly the D. wessi zones in the Mediterranean ammonite biozonation scheme. We interpret these horizons to represent recurrent hypoxic to anoxic bottom conditions that are local expression of global forcing factors during Cretaceous greenhouse conditions that lead to well-defined OAE-1a and the subsequent anoxic events. Barragan-Manzo, R., and Maurrasse, F., (2008) Revista Mexicana de Ciencias Geologicas, v. 25, 1, p. 145-157. Barragan-Manzo, R., and Mendez-Franco, 2005, Towards a standard ammonite zonation for the Aptian (Lower Cretaceous) of northern Mexico. Revista Mexicana de Ciencias Geologicas, v. 22, 1, p. 39-47. Maurrasse, F. J-M. R., Barragan-Manzo, R., and Ponton, C. 2006, Cupido- La Peña Formations: High-Productivity to Super-Productivity during the Cretaceous Enhanced Greenhouse Conditions, GSA Abst.with programs v. 38, no 7, p. 491.

Astronomy in the Classroom: Why? (Spanish Title: Astronomía en la Clase: ¿Por Qué?) Astronomia na Sala de Aula: Por Quê?

NASA Astrophysics Data System (ADS)

Daros Gama, Leandro; Bagdonas Henrique, Alexandre

2010-07-01

There are many discussions about the relevance of the topics covered in classes. One subject in particular is the focus of this essay: astronomy. In what sense and to what extent it would be worth to teach it in science or other kind of classes? In this paper we discuss some aspects of the advantages of dealing with this area of knowledge in schools, taking into account the epistemological and axiological dimensions of astronomy, in light of the vision of science as an intelligent dialogue with the world (Bachelard), in addition to the "problematization" knowledge of Paulo Freire. We propose that in fact the Astronomy does not need to be seen as just a new set of contents to be taught, but appears as a set of motivational contents for historical-philosophical discussions, and permit the discussion of concepts of other disciplines. Numerosas discusiones se están llevando a cabo acerca de la pertinencia de los temas tradicionalmente tratados en las clases. Uno de los temas, en particular, es el foco de este ensayo: la astronomía. ¿En qué sentido y en qué medida sería conveniente tratarla en clase, ya sea en clases de ciencias naturales, específicamente en las de astronomía o asignaturas afines? Elaboramos en este artículo algunos aspectos de las ventajas de tratar esta área del conocimiento en las escuelas, teniendo en cuenta las dimensiones epistemológica y axiológica de la astronomía, a la luz de la visión de la ciencia como un diálogo inteligente con el mundo (Bachelard), además de la propuesta del conocimiento "problematizador" de Paulo Freire. Proponemos que en realidad la astronomía no tiene por qué ser vista sólo como un nuevo conjunto de contenidos que se enseñan, sino que aparece como un conjunto de temas de motivación para el debate histórico-filosófico y para permitir la discusión de los conceptos típicos de otras disciplinas. Muitas discussões vêm acontecendo sobre a relevância dos temas abordados em sala de aula. Um tema, em

PREFACE: International Conference on Control and Synchronization of Dynamical Systems (CSDS-2005)

NASA Astrophysics Data System (ADS)

Pisarchik, Alexander N.

2005-01-01

) (General Director) A N Pisarchik (Centro de Investigaciones en Optica, Mexico) (Chair) R Roy (University of Maryland, USA) (SIAM representative) S Sinha (Institute of Mathematical Sciences, India) Local Organizing Committee V Aboites (Centro de Investigaciones en Optica, Mexico) R Espinosa-Luna (Centro de Investigaciones en Optica, Mexico) J H García-López (Universidad de Guadalajara, Mexico) R Jaimes-Reátegui (Universidad de Guadalajara, Mexico) A V Kir'yanov (Centro de Investigaciones en Optica, Mexico) E Kourmychev (Centro de Investigaciones en Optica, Mexico) V J Pinto-Robledo (Centro de Investigaciones en Optica, Mexico) R Rodriguez-Vera (Centro de Investigaciones en Optica, Mexico) (Research Director) G V Vazquéz-García (Centro de Investigaciones en Optica, Mexico) Funding Agencies Consejo de Ciencia y Tecnología de Estado Guanajuato, Mexico Abdus Salam International Centre for Theoretical Physics, Trieste, Italy International Mathematical Union, USA Centro Latinoamericano de Física, Brazil Academia Mexicana de Ciencias, Mexico Fundación México—Estados Unidos para la Ciencia, Mexico Cooperating Organizations International Society for Optical Engineering American Physical Society Optical Society of America Institute of Physics

PREFACE: XIV Mexican School on Particles and Fields

NASA Astrophysics Data System (ADS)

Bashir, Adnan; Contreras, Guillermo; Raya, Alfredo; Tejeda-Yeomans, Maria Elena

2011-03-01

The XIV Mexican School on Particles and Fields took place from 8-12 November, 2010, in the colonial city of Morelia, Michoacan, Mexico. The format of the school was such that the morning sessions were devoted to theoretical and experimental reviews, whereas parallel thematic sessions were held in the afternoons. All the reviews and seminars were delivered by experts of international prestige on subjects which are of current interest to the global scientific community and are also actively pursued within Mexico. In order to equip the attending graduate students and post docs with the necessary introductory tools to allow them to benefit substantially from the specialized seminars, a series of mini-courses were offered prior to the event from 4-7 November 2010, in the Auditorium of the Faculty of Science of the University of Michoacan (UMSNH). The length of each course was about 5 hours, English being the language of instruction. An informal and friendly atmosphere was encouraged during the courses so that the students could overcome their inhibitions and actively participate in the discussions. A novel feature of this event was a colloquium aimed at the general public and younger students of pre-undergraduate level, which allowed the expert scientists to reach out to a wider community and raise their awareness and interest in one of the most fascinating and vital fields of knowledge. The XIV-MSPF was organized by the Division of Particles and Fields of the Mexican Physical Society. It was generously sponsored by several institutions: Consejo Estatal de Ciencia y Tecnológico (COECyT) del Estado de Michoacán, Universidad Michoacana de San Nicolás de Hidalgo, Universidad de Sonora, Universidad Nacional Autónoma de México, Universidad de Guanajuato, Universidad de Sinaloa, Centro de Investigaciones de Estudios Avanzados del IPN (CINVESTAV), Consejo Nacional de Ciencia y Tecnología (CONACyT), la Academia Mexicana de Ciencias and, most importantly, the Red Nacional

Patterns of evolution of research strands in the hydrologic sciences

NASA Astrophysics Data System (ADS)

Schwartz, F. W.; Fang, Y. C.; Parthasarathy, S.

2005-03-01

première contribution dans leur domaine et qui ont beaucoup influencé la recherche sont en général les plus cités. Il semble que la diminution de l'importance d'un domaine de recherche est aussi reflétée par le nombre de citations. Le modèle des citations des quelques articles classiques montre que l'activité dans le domaine ainsi que l'impact sur les articles suivantes déclinent progressivement pendant le temps ce qui présente une analogie avec les idées de Kuhn sur la science normale et révolutionnaire. Le résultat de l'étude renforce une fois de plus l'importance d'être un pionnier dans un domaine, en faisant avancer la recherche dans le domaine respectif, en adoptant des stratégies qui peuvent créer des percées majeures dans la recherche. Este artículo examina los temas de impacto e innovación en la investigación de las aguas subterráneas, mediante el uso de datos bibliométricos y del análisis de las referencias bibliográficas. El análisis se basó en 3120 artículos de la revista Water Resources Research, con el contenido completo y sus datos de referencias bibliográficas obtenidos de la Red de Ciencia ISI. La investigación se diseñó para desarrollar un entendimiento mayor de la forma en que la cantidad de citas bibliográficas puede ser interpretada por los científicos. No es sorprendente que los artículos más citados, parecen ser los pioneros en el campo, siendo artículos que divergen significativamente de lo que se ha hecho anteriormente, los cuales son efectivos creando de manera similar otros artículos "seguidores". Los artículos que son contribuciones iniciales en una línea de investigación nueva, la cual es de alta influencia, serán en promedio citados muy frecuentemente. Sin embargo, la importancia de una línea de investigación, de acuerdo a su medida por las veces que es citada, parece disminuir con el tiempo. Las tendencias en cuanto a hacer citas bibliográficas de algunos artículos clásicos, muestran que la

The Practice of Research of a Basic Education Teacher Involving Mental Models of the Phases of the Moon and Eclipses. (Spanish Title: La Práctica de Investigación de un Maestro de Educación BÁsica con El Uso de los Modelos Mentales de Las Fases de la Luna Y Eclipses.) A Prática de Pesquisa de um Professor do Ensino Fundamental Envolvendo Modelos Mentais de Fases da Lua e Eclipses

NASA Astrophysics Data System (ADS)

Pessôa Queiroz, Glória; Jubitipan Borges de Sousa, Carlos; Auxiliadora Delgado Machado, Maria

2009-12-01

The inclusion of basic education teachers in the survey domain is a controversial issue and fully debated in the academy. The opportunity for a collective work that incorporated school teachers from a public school to a university's group of physics teaching at university allowed us to glimpse the redefinition of the function of a science teacher (a coauthor of this paper) by himself, such that now he includes research on the knowledge construction by students in his teacher practice. The formation of inter-institutional groups for action planning and research in these areas has proved productive for the task of knowledge construction to support educational processes in school, while the university enriches its collection of experiences critically validated, and can consider the results in teachers initial and continued education. The active participation of the teacher in a research group at the university led him to reflect on the possible didactical ways to be described, analyzed and communicated to other teachers. The construction of a pedagogy that took into account the mental models of students on the basic topics of astronomy, and the changes developed resulting from the lessons taught, led to far-reaching consequences on the pedagogy adopted by the teacher, who incorporates now a new vision of science and alternative forms to dialogue with students, essential components for a researcher in Science Education. La inclusión de los maestros de la escuela básica en el universo de la investigación es polémica y está en amplio debate en el mundo académico. La oportunidad de trabajo colectivo de los maestros de una escuela pública en Río de Janeiro con un grupo universitario de enseñanza de la física nos ha permitido vislumbrar la redefinición de la función de un maestro de ciencias (uno de los coautores de este documento) por él mismo, ahora para incluir la investigación sobre la construcción del conocimiento por los alumnos en su práctica como

[Acute myeloid leukemia in adults: experience at the Instituto Nacional de Ciencias Médicas y Nutrición Salvador Zubirán from 2003 to 2008].

PubMed

Buitrón-Santiago, Natalie; Arteaga-Ortiz, Luis; Rosas-López, Adriana; Aguayo, Alvaro; López-Karpovitch, Xavier; Crespo-Solís, Erick

2010-01-01

Acute myeloid leukemia (AML) comprises a group of diseases with different biologic characteristics; despite knowledge improvements, these are not reflected in long term survival. To describe characteristics of adults with AML in a hospital of Mexico City, their treatment response, complications and to evaluate survival related factors. Cohort study. Between January 2003 and July 2008, patients with AML diagnosis were included (except promyelocitic). Treatment protocols used: 3 + 7, high doses of cytarabine and autologous bone marrow transplant as consolidation therapy. 53 patients were included. Median age: 44 years (15-79). At diagnosis: tumor lysis syndrome in 4/ 53 (7.5%), 3/51 (5.9%) with altered liver function test and hyperleukocytosis in 8/53 (15.1%). 46 patients had available cytogenetic and this was successful in 28/46 (60.8%), 12/28 (42.8%) had adverse cytogenetic; 16/28 (57.1%) intermediate risk and none was favorable. There were 2 losses during follow up, 7 patients did not receive chemotherapy with curative intent and 1 died at diagnosis. 43 patients received 3 + 7, 13.9% died during aplasia, complete remission was achieved in 27/43 (62.7%) and 10/43 (23.2%) were refractory to treatment. A second induction attempt was required in 39.5% (17/43). Median disease free survival (DFS) was 491 days (366-615), with a median follow up of 993 days (105-1744). The median overall survival (OS) was 531 days (312-749). Aplasia related mortality decreased (p = 0.09) between the actual cohort (13.9%) and the historical cohort (37%). Long term survival in AML patients remains poor despite improvements in diagnosis, classification, and treatment. In our institution, it is required to improve induction protocols and cytogenetic analysis in order to adequately choose the group of patients that could be benefit from stem cell transplant.

[Laparoscopic Roux-en-Y gastric bypass surgery for morbid obesity. Experience at the Nacional de Ciencias Médicas y Nutrición Salvador Zubirán].

PubMed

Romero-Lbargüengoitia, María Elena; Lerman-Garber, Israel; Herrera-Hernández, Miguel Francisco; Pablo-Pantoja, Juan; Sierra-Salazar, Mauricio; López-Rosales, Federico; Zamora-Barrón, Margarita; Vargas-Martínez, Angeles; García-García, Eduardo

2009-01-01

Morbid obesity is a serious health problem associated to a significant reduction in life expectancy. To evaluate the anthropometric and metabolic changes observed in obese patients, 3, 6 and 12 months after laparoscopic Roux-en-Y gastric bypass surgery and the complications associated with the procedure. Retrospective study that included 128 consecutive obese patients submitted for bariatric surgery at the INCMNSZ (2004-2006). Their mean age was 38 +/- 10 years, 83% were women with a BMI of 48 +/- 6 Kg/m2. 65% were hypertensives, 55% had hypertriglyceridemia and 34% diabetes. A year after surgery all patients had at least reduced 20% their body weight and the percentage of excess body weight loss was 73%. The prevalence of hypertension, hypertrigliceridemia and diabetes was reduced to 24%, 17% and 12%, respectively (p < 0.001). Four patients died (3%), all of them had a leak of the anastomosis and intra-abdominal abscess. One died because pulmonary embolism, another with a myocardial infarction (after surgical reinterventions) and the other two with sepsis. Laparoscopic Roux-en-Y gastric bypass surgery in morbid obese patients favors significant reductions in body weight and associated co morbidities. This surgery is not free of complications and mortality, reason why it must be done only by surgical and interdisciplinary groups with experience in these procedures.

Bortezomib for antibody mediated rejection treatment: experience at the Instituto Nacional de Ciencias Médicas y Nutrición Salvador Zubirán in Mexico City.

PubMed

Leyva, Sergio; Marino-Vázquez, Lluvia A; Reyes-Loaeza, Jorge A; Vega, Olynka; Uribe-Uribe, Norma; Alberú, Josefina; Morales-Buenrostro, Luis E

2009-01-01

The use of bortezomib as a treatment modality of AHR improved and stabilized graft function (clinical response) in the majority of patients. Its use in single dose, even combined with rituximab, does not seem to be useful to obtain a sustained clinical response neither to reduce HLAabs level. The use of 4 doses of bortezomib in days 1, 4, 7, and 10 (1.3 mg/m2 BSA each) plus plasmapheresis produced both a good clinical response and a reduction in DSA. Moving forward, it will necessary to define the long-term effectiveness of bortezomib and whether rituximab administration is indispensable to achieve this goal.

Four decades of the kidney transplantation program at the Institute Nacional de Ciencias Médicas y Nutrición Salvador Zubirán in Mexico City.

PubMed

Morales-Buenrostro, Luis E; Marino-Vázquez, Lluvia A; Alberú, Josefina

2009-01-01

This is a retrospective study that includes four decades of kidney transplant program at our Institute, with a total of 923 kidney transplants in 872 recipients. In this report, the effect of variables in recipient, donor, and transplant on long-term graft survival was analyzed using the Kaplan Meier method with log-rank test for survival comparisons. Global graft survival at our center-analyzed by censoring for death-with-functioning-graft-for 1, 5 and 10 years was 93%, 83% and 74%, respectively, with median survival of 24.5 years. When analyzed for all-cause graft loss, 1, 5 and 10 year survival was 90%, 76% and 61%, with 12.8-year median survival. Variables associated with lower graft survival censored for death-with-functioning-graft were transplantation in an earlier decade, less histocompatibility, younger kidney transplant recipients, no induction therapy, and double drug initial immunosuppression. After Cox's regression multivariate analysis, the risk factors that remained associated with worse survival were younger recipient, earlier transplant decade, and deceased donor.

Photometric Calibration of the Gemini South Adaptive Optics Imager

NASA Astrophysics Data System (ADS)

Stevenson, Sarah Anne; Rodrigo Carrasco Damele, Eleazar; Thomas-Osip, Joanna

2017-01-01

The Gemini South Adaptive Optics Imager (GSAOI) is an instrument available on the Gemini South telescope at Cerro Pachon, Chile, utilizing the Gemini Multi-Conjugate Adaptive Optics System (GeMS). In order to allow users to easily perform photometry with this instrument and to monitor any changes in the instrument in the future, we seek to set up a process for performing photometric calibration with standard star observations taken across the time of the instrument’s operation. We construct a Python-based pipeline that includes IRAF wrappers for reduction and combines the AstroPy photutils package and original Python scripts with the IRAF apphot and photcal packages to carry out photometry and linear regression fitting. Using the pipeline, we examine standard star observations made with GSAOI on 68 nights between 2013 and 2015 in order to determine the nightly photometric zero points in the J, H, Kshort, and K bands. This work is based on observations obtained at the Gemini Observatory, processed using the Gemini IRAF and gemini_python packages, which is operated by the Association of Universities for Research in Astronomy, Inc., under a cooperative agreement with the NSF on behalf of the Gemini partnership: the National Science Foundation (United States), the National Research Council (Canada), CONICYT (Chile), Ministerio de Ciencia, Tecnología e Innovación Productiva (Argentina), and Ministério da Ciência, Tecnologia e Inovação (Brazil).

What can we learn from the dynamics of entanglement and quantum discord in the Tavis-Cummings model?

NASA Astrophysics Data System (ADS)

Restrepo, Juliana; Rodriguez, Boris A.

We revisit the problem of the dynamics of quantum correlations in the exact Tavis-Cummings model. We show that many of the dynamical features of quantum discord attributed to dissipation are already present in the exact framework and are due to the well known non-linearities in the model and to the choice of initial conditions. Through a comprehensive analysis, supported by explicit analytical calculations, we find that the dynamics of entanglement and quantum discord are far from being trivial or intuitive. In this context, we find states that are indistinguishable from the point of view of entanglement and distinguishable from the point of view of quantum discord, states where the two quantifiers give opposite information and states where they give roughly the same information about correlations at a certain time. Depending on the initial conditions, this model exhibits a fascinating range of phenomena that can be used for experimental purposes such as: Robust states against change of manifold or dissipation, tunable entanglement states and states with a counterintuitive sudden birth as the number of photons increase. We furthermore propose an experiment called quantum discord gates where discord is zero or non-zero depending on the number of photons. This work was supported by the Vicerrectoria de Investigacion of the Universidad Antonio Narino, Colombia under Project Number 20141031 and by the Departamento Administrativo de Ciencia, Tecnologia e Innovacion (COLCIENCIAS) of Colombia under Grant Number.

Post-maximum Near-infrared Spectra of SN 2014J: A Search for Interaction Signatures

NASA Astrophysics Data System (ADS)

Sand, D. J.; Hsiao, E. Y.; Banerjee, D. P. K.; Marion, G. H.; Diamond, T. R.; Joshi, V.; Parrent, J. T.; Phillips, M. M.; Stritzinger, M. D.; Venkataraman, V.

2016-05-01

We present near-infrared (NIR) spectroscopic and photometric observations of the nearby Type Ia SN 2014J. The 17 NIR spectra span epochs from +15.3 to +92.5 days after B-band maximum light, while the {{JHK}}s photometry include epochs from -10 to +71 days. These data are used to constrain the progenitor system of SN 2014J utilizing the Paβ line, following recent suggestions that this phase period and the NIR in particular are excellent for constraining the amount of swept-up hydrogen-rich material associated with a non-degenerate companion star. We find no evidence for Paβ emission lines in our post-maximum spectra, with a rough hydrogen mass limit of ≲ 0.1 M ⊙, which is consistent with previous limits in SN 2014J from late-time optical spectra of the Hα line. Nonetheless, the growing data set of high-quality NIR spectra holds the promise of very useful hydrogen constraints. Based on observations obtained at the Gemini Observatory under program GN-2014A-Q-8 (PI: Sand). Gemini is operated by the Association of Universities for Research in Astronomy, Inc., under a cooperative agreement with the NSF on behalf of the Gemini partnership: the National Science Foundation (United States), the National Research Council (Canada), CONICYT (Chile), Ministerio de Ciencia, Tecnología e Innovación Productiva (Argentina), and Ministério da Ciência, Tecnologia e Inovação (Brazil).

Written Materials for the IYA

NASA Astrophysics Data System (ADS)

Fierro Gossman, Julieta

2008-05-01

In the poster presentation I shall describe the written materials we have edited for the IYA. The first is a book written for general public about Galileo's life and research. The rest are a series of articles for teachers so that they include hands-on astronomy activities in their classroom including a star party. All these materials are written in Spanish, that is a language spoken is large areas of the world. I believe science is better understood in the mother tong so that many of these materials will be also useful for countries where Spanish is a second language. References Hector Dominguez y Julieta Fierro Galileo y el telescopio, 400 anios de ciencia Uribe y Ferrari Editores, 2007 ISBN 970 756 238-2 Hector Dominguez y Julieta Fierro Newton, la luz y el movimiento de los cuerpos Uribe y Ferrari Editores, 2007 ISBN 970 756 238 2 Hector Dominguez y Julieta Fierro, Galileo para Maestros I Correo del Maestro, Núm. 133, p. 15-26, Anio 12, Junio 2007. Hector Dominguez y Julieta Fierro, Galileo para Maestros II Correo del Maestro, Num. 134, p. 17-26, Anio 12, 2007. Hector Dominguez y Julieta Fierro, Galileo para Maestros III Correo del Maestro, Num. 135, p. 10-18, Anio 12, 2007. Hector Dominguez y Julieta Fierro Experimentos sobre la caida de los cuerpos El Correo del Maestro, anio 12 Numero 142, p. 5-18, 2008.

Soil Organic Carbon assessment on two different forest management

NASA Astrophysics Data System (ADS)

Fernández Minguillón, Alex; Sauras Yera, Teresa; Vallejo Calzada, Ramón

2017-04-01

Soil Organic Carbon assessment on two different forest management. A.F. Minguillón1, T. Sauras1, V.R: Vallejo1. 1 Departamento de Biología Evolutiva, Ecología y Ciencias Ambientales, Universidad de Barcelona, Avenida Diagonal 643, 03080 Barcelona, Spain. Soils from arid and semiarid zones are characterized by a low organic matter content from scarce plant biomass and it has been proposed that these soils have a big capacity to carbon sequestration. According to IPCC ARS WG2 (2014) report and WG3 draft, increase carbon storage in terrestrial ecosystems has been identified such a potential tool for mitigation and adaptation to climate change. In ecological restoration context improve carbon sequestration is considered a management option with multiple benefits (win-win-win). Our work aims to analyze how the recently developed restoration techniques contributed to increases in terrestial ecosystem carbon storage. Two restoration techniques carried out in the last years have been evaluated. The study was carried out in 6 localities in Valencian Community (E Spain) and organic horizons of two different restoration techniques were evaluated; slash brush and thinning Aleppo pine stands. For each technique, carbon stock and its physical and chemical stability has been analysed. Preliminary results point out restoration zones acts as carbon sink due to (1) the relevant necromass input produced by slash brush increases C stock on the topsoil ;(2) Thinning increase carbon accumulation in vegetation.

Immunochemistry of the Group-Specific Polysaccharide of Nocardia brasiliensis

PubMed Central

Estrada-Parra, Sergio; Zamora, Abel; Bojalil, L. F.

1965-01-01

Estrada-Parra, Sergio (Escuela Nacional de Ciencias Biológicas, México, D.F., México), Abel Zamora, and L. F. Bojalil. Immunochemistry of the group-specific polysaccharide of Nocardia brasiliensis. J. Bacteriol. 90:571–574. 1965.—The group-specific polysaccharide of Nocardia brasiliensis was further purified, yielding an amorphous white material with the following characteristics: [α]D20 = + 48; nitrogen, 0.5%; phosphorus, 0.1%; and ash as sodium, 0.8%. The polymer is made of d-arabinose and d-galactose in a molar ratio of 3:1, and no other sugars were detected. Mild hydrolysis liberates mainly arabinose. The polysaccharide consumes 3.46 μmoles of periodate per mg of polymer in 15 days at 4 C (this value remains constant after 4 more days). Oxidation results in destruction of two of the arabinose, with the formation of two glycerols after borohydride reduction and hydrolysis. The polysaccharide oxidized by periodate and reduced under mild acid hydrolysis at 20 C yields glycerol and a polymer formed by galactose and arabinose (in a ratio of 1:1) which is resistant to a second oxidation. Therefore, the polysaccharide is probably formed by a main chain of glactose linked 1,3 and arabinose linked 1,2 or 1,3 or both, and nonreducing side chains of arabofuranose residues. The intact polysaccharide cross-reacts with sera from patients with active tuberculosis, and this, as well as the homologous reaction, is abolished by oxidation with periodate. PMID:16562050

Identification of type materials of the species of Protypotherium Ameghino, 1885 and Patriarchus Ameghino, 1889 (Notoungulata: Interatheriidae) erected by Florentino Ameghino.

PubMed

FernÁndez, Mercedes; Fernicola, Juan Carlos; CerdeÑo, Esperanza; Reguero, Marcelo A

2018-02-27

The first collections of Interatheriinae (Interatheriidae, Notoungulata) were created by the brothers Florentino and Carlos Ameghino, based on fossil specimens collected from diverse outcrops of Argentina and housed at different national institutions. In order to perform a systematic study of the subfamily, it is essential to revise as much specimens as possible, but first of all those that were used to establish the respective species, that is, the type material. Florentino Ameghino never referred to the collection number of the type specimens of the species he erected in any of his publications; this fact added to the occasional absence of illustrations and adequate descriptions, all of which make their identification a complex task. Thus, when studying the species erected by Florentino Ameghino within Protypotherium and Patriarchus, we recognised a lack of correspondence between some specimens that appeared labelled as types in the collections and the original descriptions of these species. In this contribution, we identify the type specimens of the eleven species of Protypotherium and eight of Patriarchus founded by Florentino Ameghino, housed in the Museo Argentino de Ciencias Naturales "Bernardino Rivadavia" (Buenos Aires, Argentina) and the Zoological Museum of the University of Copenhagen (Denmark). Three case studies are presented: a) specimens correctly identified; b) specimens erroneously catalogued as type material; and c) specimens not established as types in Ameghino's catalogue, but herein recognised as such. Lectotype and paralectotype of P. antiquum are herein designated.

Expression of HER2/Neu in B-Cell Acute Lymphoblastic Leukemia.

PubMed

Rodriguez-Rodriguez, Sergio; Pomerantz, Alan; Demichelis-Gomez, Roberta; Barrera-Lumbreras, Georgina; Barrales-Benitez, Olga; Aguayo-Gonzalez, Alvaro

2016-01-01

The expression of HER2/neu in B-cell acute lymphoblastic leukemia has been reported in previous studies. The objective of this research was to study the expression of HER2/neu on the blasts of patients with acute leukemia from the Instituto Nacional de Ciencias Medicas y Nutricion Salvador Zubiran. From June 2015 to February 2016, a HER2/neu monoclonal antibody was added to the panel of antibodies that we routinely use in patients with acute leukemia. An expression of ≥ 30% was considered positive. We studied 33 patients: 19 had de novo leukemia (57.6%), three (9.1%) were in relapse, and in 11 (33.3%) their status could not be specified. Seventeen patients (51.5%) were classified as B-cell acute lymphoblastic leukemia with a median expression of HER2/neu of 0.3% (range 0-90.2). Three patients with B-cell acute lymphoblastic leukemia were positive for HER2/neu: 89.4%, 90.9%, and 62.4%. The first and third patient had de novo B-cell acute lymphoblastic leukemia. The second patient was in second relapse after allogeneic stem cell transplant. All three patients were categorized as high-risk at the time of diagnosis. In the studied Mexican population, we found a positive expression of HER2/neu in 17% of the B-cell acute lymphoblastic leukemia patients, similar to previous studies in which the expression was found in 15-50%.

A Peruvian family with a novel PARK2 mutation: Clinical and Pathological Characteristics

PubMed Central

Cornejo-Olivas, Mario; Torres, Luis; Mata, Ignacio F; Mazzetti, Pilar; Rivas, Diana; Cosentino, Carlos; Inca-Martinez, Miguel; Cuba, Juan M; Zabetian, Cyrus P.; Leverenz, James B.

2015-01-01

Background Mutations in PARK2 result in autosomal recessive young onset Parkinson’s disease (YOPD). Although there have been a number of reports on the clinical characteristics of PARK2-related PD, there is limited information available on the associated neuropathologic changes. Design We describe the clinical and pathological characteristics of a Peruvian family with YOPD. The proband and one unaffected sibling were screened for PARK2 dosage and point mutations. One affected sibling had detailed neuropathologic examination. Setting Instituto Nacional de Ciencias Neurologicas (INCN) in Lima, Peru Results The proband and two of her four siblings developed YOPD and both parents were unaffected. The clinical course has been characterized by akinetic-rigid parkinsonism predominantly affecting the lower limbs and dyskinesias. Analysis of PARK2 showed that the proband is compound heterozygous for a novel acceptor splice site mutation in intron 5 (IVS5-1G>A) and an exon 7 deletion. Neuropathologic assessment of an affected sibling revealed severe neuronal loss in the substantia nigra (SN) and loss of tyrosine hydroxylase immunopositive fibers in the striatum. No Lewy body pathology was observed using standard histology or immunohistochemistry for α-synuclein. Conclusions Consistent with most neuropathologic reports of patients with PARK2 mutations, we did not observe Lewy body inclusions, despite marked SN degeneration and severe dopaminergic denervation of the striatum. These data describe a novel splice site mutation and further extend the clinicopathological characterization of PARK2-associated PD. PMID:25817512

Association between Facebook dependence and poor sleep quality: a study in a sample of undergraduate students in Peru.

PubMed

Wolniczak, Isabella; Cáceres-DelAguila, José Alonso; Palma-Ardiles, Gabriela; Arroyo, Karen J; Solís-Visscher, Rodrigo; Paredes-Yauri, Stephania; Mego-Aquije, Karina; Bernabe-Ortiz, Antonio

2013-01-01

Internet can accelerate information exchange. Social networks are the most accessed especially Facebook. This kind of networks might create dependency with several negative consequences in people's life. The aim of this study was to assess potential association between Facebook dependence and poor sleep quality. A cross sectional study was performed enrolling undergraduate students of the Universidad Peruana de Ciencias Aplicadas, Lima, Peru. The Internet Addiction Questionnaire, adapted to the Facebook case, and the Pittsburgh Sleep Quality Index, were used. A global score of 6 or greater was defined as the cutoff to determine poor sleep quality. Generalized linear model were used to determine prevalence ratios (PR) and 95% confidence intervals (95%CI). A total of 418 students were analyzed; of them, 322 (77.0%) were women, with a mean age of 20.1 (SD: 2.5) years. Facebook dependence was found in 8.6% (95% CI: 5.9%-11.3%), whereas poor sleep quality was present in 55.0% (95% CI: 50.2%-59.8%). A significant association between Facebook dependence and poor sleep quality mainly explained by daytime dysfunction was found (PR = 1.31; IC95%: 1.04-1.67) after adjusting for age, sex and years in the faculty. There is a relationship between Facebook dependence and poor quality of sleep. More than half of students reported poor sleep quality. Strategies to moderate the use of this social network and to improve sleep quality in this population are needed.

PubMed

Roldan, Mariela; Bella, Monica; Dionisio, Leandro

2018-04-11

Ciencias Médicas Universidad Nacional de Córdoba.ResumenLa violencia doméstica es actualmente un problema de salud pública debido a su magnitud y repercusiones sociosanitarias. Objetivo: explorar las características epidemiológicas sociodemográficas y psicopatológicas  de personas denunciadas como agresores en la ciudad de Córdoba. Material y Métodos: estudio exploratorio, retrospectivo y transversal de los registros de personas denunciadas como presuntos agresores de violencia intrafamiliar en la fiscalía de violencia familiar de los tribunales Judiciales Provinciales de Córdoba Capital en el período junio 2011 a mayo 2012. Resultados: el (86%) fueron varones y el (14%) mujeres con una  edad de ±35 años. La violencia de pareja fue la más prevalente en el (69%). El grupo etario más comprometido fue el de 20 a 39 años El tipo de lesión más frecuente fue la amenaza (45,6%), seguida de lesiones graves (35,3%). La mayor parte de  los casos no presentó diagnóstico de trastorno mental (64,3%). El trastorno mental más frecuente fue el consumo de sustancia (28,3%). Conclusión: el tipo de violencia denunciada con mayor frecuencia fue la violencia intrafamiliar de pareja y afectó a la gente de edad joven y productiva mostrando un comportamiento de género y factores de riesgo social.

TEDESE project: preliminary results

NASA Astrophysics Data System (ADS)

Buforn, E.; Martín Dávila, J.; Bock, G.; Pazos, A.; Udías, A.; Hanka, H.; Gárate, J.; Perez Peña, A.

2003-04-01

The TEDESE (Terremotos y Deformación Cortical en el Sur de España) project is a joint project of the Universidad Complutense de Madrid (UCM) and Real Instituto y Observatorio de la Armada de San Fernando, Cádiz (ROA) supported by the Spanish Ministerio de Ciencia y Tecnología with the participation of the GeoforschungZentrum, Potsdam (GFZ). The project started on January 2001 and it will extend till December 2003. As part of this project a temporal network of 10 broad-band seismological stations, which will complete those already existing in the zone, have been installed for a period of 20 months (October 01-June 03) in southern Spain and northern Africa. This temporary net has recorded, till November 2002, more than 760 regional earthquakes, with magnitudes between 1.7 and 5.1. We have studied in detail two shallow events occurred in Gergal (Almería, SE Spain, 04-02- 02, M=5.0) and Bullas (Murcia, SE Span, 06-08-02, M=4.8), its aftershocks series and two intermediate depth (h=90km) earthquakes located in Málaga (Spain, M=4.5). GPS time series, from permanent GPS stations deployed at the region by ROA and other institutions, have been produced and velocity vectors have been derived. GPS data coming from previous periodic field campaigns carried out in the region by ROA since 1996 are being reprocessed, and a new GPS campaing is planned for June 2003.

[Genitourinary tuberculosis in the urologic works of Professor Rafael Mollá Rodrigo].

PubMed

Cánovas Ivorra, Jose Antonio; Tramoyeres Galván, Alfredo; Sánchez Ballester, Francisco; de la Torre Abril, Luis; Ordoño Domínguez, Felipe; Navalón Verdejo, Pedro; Ramada Benlloch, Francisco; López Alcina, Emilio; Pérez Albacete, Mariano; Zaragoza Orts, Julio

2005-04-01

Professor Rafael Molla Rodrigo is considered by some the author who contributed with his scientific work and solid technique to consolidate Urology as a speciality in Valencia. Such importance is also perceived in a national level, as demonstrated by the fact that he belonged to the first board of the Spanish Association of Urology and contributed to its foundation in the two-year period 1910--1911, from his position of head of the department of Surgical Therapy and Operations at the Central University. Genitourinary tuberculosis is one of the most outstanding chapters of his extensive works. We reviewed all his works, selecting all original articles about genitourinary tuberculosis. Original articles have been obtained from the journals Revista de Higiene y Tuberculosis, La Medicina Valenciana, Revista Valenciana de Ciencias Médicas y Policínica, and from his two most important books, Clinical Lessons In Urology and Clinical Lessons in Urology and Genitourinary Surgery. Throughout his work he analyzes features of relevance about this disease, such as diagnosis, about which he emphasizes the clinical and bacteriological difficulties, and treatment, which was only feasible by precocious nephrectomy. He dedicates a great part of his work to the study of this pathology and defends a precocious diagnosis in order to perform the only treatment that had demonstrated efficacy. He also exposes the symptoms and variety of clinical presentations, as well as diagnosis through separate kidney catheterization with the aim to determine unilateral involvement.

A precessing jet in the NGC2264G outflow

NASA Astrophysics Data System (ADS)

McCoey, Carolyn; Teixeira, P. S.; Fich, M.; Lada, C. J.

2007-05-01

We present new infrared imaging of the NGC 2264 G protostellar outflow region, obtained with the Spitzer Space Telescope. A jet in the red (eastern) outflow lobe is clearly detected in all four IRAC bands and, for the first time, is shown to continuously extend over the entire length of the red outflow lobe, as traced by CO observations. The jet also extends to a deeply embedded Class 0 source, VLA2, confirming previous suggestions that it is the driving source of the outflow. The images show that the easternmost part of the jet exhibits what appears to be multiple changes of direction. We consider two possible explanations for the jet morphology: (i) deflection of the jet off the walls of the outflow lobes as proposed by Fich & Lada (1997) and (ii) precession. The jet structure shown in the IRAC images can be largely, although not entirely, explained by a slowly precessing jet (period 8000 yr) that lies mostly on the plane of the sky. In either case it appears that the observed and inferred changes in the jet direction are sufficient to broaden the NGC 2264 G outflow to an extent comparable to that observed in the CO emission. P. S. T. acknowledges support from the scholarship SFRH/BD/13984/2003 awarded by the Fundaçao para a Ciencia e Tecnologia (Portugal). Both M. F. and C. M. are supported by a Natural Sciences and Engineering Research Council of Canada (NSERC) Discovery Grant.

Electronic structure of scandium-doped MgB2

NASA Astrophysics Data System (ADS)

de La Peña, Omar; Agrestini, Stefano

2005-03-01

Recently has been reported the synthesis of a new superconducting alloy based on MgB2, where Mg is partially substituted with Sc. In order to analyze the effect of Sc doping on the structural and superconducting properties of Mg1-xScxB2, we have performed a detailed study of the electronic structure for this new diboride. The calculations have been done using the first-principles LAPW method, within the supercell approach for modeling the doping. In this work we report results for the electronic band structure, Fermi surface, and density of states. The effect of the Sc-d orbitals on the structural and electronic properties of Mg1-xScxB2 is analyzed. Increasing the Sc concentration (x) the σ-band is gradually filled, because Sc have one valence electron more than Mg. Interestingly, the analysis of the band structure shows that even for ScB2 the top of the σ-band remain above the Fermi level, nevertheless the σ-band presents high dispersion and has an important contribution of d states. In this way, in addition to the band filling effect, Sc doping gradually reduces the two-dimensional character of the σ- band in Mg1-xScxB2 as a result of increasing the sp(B)-d(Sc) hybridization. This research was partially supported by Consejo Nacional de Ciencia y Tecnolog'ia (CONACYT, M'exico) under Grant. No. 43830-F

[Treatment of non-Hodgkin's lymphoma associated with acquired immnodeficiency syndrome (AIDS) at the Instituto Nacional de Ciencias Médicas y Nutrición Salvador Zubirán].

PubMed

Uriarte-Duque, Juan; Hernández-Riverab, Gabriela

2006-01-01

Survival in patients with acquired immunodeficiency syndrome (AIDS) related non-Hodgkin's Lymphoma has improved with the use of High Active Antiretroviral Therapy (HAART) and less toxic chemotherapy. Clinical characteristics and outcome among patients treated for AIDS related non-Hodgkin's Lymphoma are described. Nine patients were studied retrospectively. Overall survival (OS) and Free Disease Survival (FDS) using a Kaplan-Meier model were analyzed. Patients received (DA-EPOCH) etoposide, prednisone, vincristine, doxorubicin and cyclophosphamide. The overall Survival was 18 months and 13 month Free Disease Survival with a median follow-up of 16 months showing full response in 8/9 patients was observed. A very satisfactory treatment response in this group of patients expressed as an increased Overall Survival was noted.

Bortezomib for acute humoral rejection treatment at the Instituto Nacional de Ciencias Médicas y Nutrición Salvador Zubirán in Mexico City: an update.

PubMed

Leyva, Sergio; Marino, Lluvia A; Alberú, Josefina; Morales-Buenrostro, Luis E

2010-01-01

The use of bortezomib as a treatment modality of AHR improved and stabilized graft function (clinical response) in the majority of patients. Its use in single dose, even combined with rituximab, does not seem to be useful to obtain a sustained clinical response, or to reduce HLAabs level. The use of 4 doses of bortezomib in days 1, 4, 7, and 10 (1.3 mg/m2 BSA each) plus plasmapheresis produced both a good clinical response and a reduction in DSA. Moving forward, it will be necessary to define the long-term effectiveness of bortezomib and whether rituximab administration is indispensable to achieve this goal. Until now, it is evident that many patients needed retreatment and they were well tolerated.

Reported Church Attendance at the Time of Entry into HIV Care is Associated with Viral Load Suppression at 12 Months.

PubMed

Van Wagoner, Nicholas; Elopre, Latesha; Westfall, Andrew O; Mugavero, Michael J; Turan, Janet; Hook, Edward W

2016-08-01

The Southeast has high rates of church attendance and HIV infection rates. We evaluated the relationship between church attendance and HIV viremia in a Southeastern US, HIV-infected cohort. Viremia (viral load ≥200 copies/ml) was analyzed 12 months after initiation of care. Univariate and multivariable logistic regression models were fit for variables potentially related to viremia. Of 382 patients, 74 % were virally suppressed at 12 months. Protective variables included church attendance (AOR 0.5; 95 % CI 0.2, 0.9), being on antiretroviral therapy (AOR 0.01; 95 % CI 0.004, 0.04), CD4(+) T lymphocyte count 200-350 cells/mm(3) at care entry (AOR 0.3; 95 % 0.1, 0.9), and education (AOR 0.5; 95 % CI 0.2, 0.9). Variables predicting viremia included black race (AOR 3.2; 95 % CI 1.4, 7.4) and selective disclosure of HIV status (AOR 2.7; 95 % CI 1.2, 5.6). Church attendance may provide needed support for patients entering HIV care for the first time. El Sur Este de los Estados Unidos tiene tasas altas de visitas a iglesias y de infección por VIH. Evaluamos la relación entre visitas a iglesias y viremia por VIH en una cohorte de pacientes infectados con VIH en el Sur Este de los EEUU. La viremia (carga viral ≥ 200 copias/ml) fue analizada a los 12 meses de iniciar el cuidado médico. Los modelos de regresión logística univariado y multivariado fueron ajustados para variables potencialmente relacionadas a viremia. De 382 pacientes, 75 % tuvieron supresión virológica a los 12 meses. Variables que ofrecieron protección fueron visitas a iglesias (AOR 0.5; IC95 % 0.2-0.9), recibir terapia antiretroviral (AOR 0.01; IC95 % 0.004,0.04), recuento de linfocitos T CD4 + 200-350 al iniciar cuidado médico (AOR 0.3; IC95 % 0.1,09), y educación (AOR 0.5; IC95 % 0.2,0.9). Las variables que predijeron viremia incluyeron raza negra (AOR 3.2; IC95 % 1.4,7.4) y la comunicación selectiva del diagnóstico de VIH a otras personas (AOR 2.7; 95 % IC 1

Mirror Coronograph for Argentina (MICA). Primera Luz

NASA Astrophysics Data System (ADS)

Stenborg, G.; Epple, A.; Schwenn, R.; Francile, C.; Rovira, M.

En Julio de 1997 se terminó con la primera parte de la instalación del ``Coronógrafo de Espejo para la Argentina'' en la estación de altura Carlos U. Cesco (El Leoncito), gracias al esfuerzo de la gente del Max Planck Institut für Aeronomie (Alemania), del OAFA y del IAFE. Dicho coronógrafo forma parte de un programa de ciencia bilateral entre Alemania y Argentina. El propósito del mismo, en conjunción con otros telescopios solares y terrestres, es contribuir a un mejor entendimiento de cuestiones fundamentales de la física solar. Para ello, ya está observando la corona de emisión en el verde (Fe XIV), rojo (Fe X) y Hα entre 1.05 y 2 radios solares aproximadamente. El diseño del instrumento, el cual fuera ya presentado en esta misma reunión en La Plata en 1996, es esencialmente similar al del telescopio LASCO-C1 a bordo del Solar Heliospheric Observatory (SOHO). La adquisición de datos se realiza con un CCD de 1280x1024 pixels, codificando en 12 bits, pudiendo ser el mismo operado en forma remota. En esta reunión presentaremos algunas de las observaciones realizadas durante la puesta a punto del instrumento en el período julio-setiembre de 1997. Asimismo expondremos cómo y por qué sus resultados complementarán a los de su par en el espacio.

Hispanic Latin America, Spain and the Spanish-speaking Caribbean: A rich source of reference material for public health, epidemiology and tropical medicine

PubMed Central

Williams, John R; Bórquez, Annick; Basáñez, María-Gloria

2008-01-01

There is a multiplicity of journals originating in Spain and the Spanish-speaking countries of Latin America and the Caribbean (SSLAC) in the health sciences of relevance to the fields of epidemiology and public health. While the subject matter of epidemiology in Spain shares many features with its neighbours in Western Europe, many aspects of epidemiology in Latin America are particular to that region. There are also distinctive theoretical and philosophical approaches to the study of epidemiology and public health arising from traditions such as the Latin American social medicine movement, of which there may be limited awareness. A number of online bibliographic databases are available which focus primarily on health sciences literature arising in Spain and Latin America, the most prominent being Literatura Latinoamericana en Ciencias de la Salud (LILACS) and LATINDEX. Some such as LILACS also extensively index grey literature. As well as in Spanish, interfaces are provided in English and Portuguese. Abstracts of articles may also be provided in English with an increasing number of journals beginning to publish entire articles written in English. Free full text articles are becoming accessible, one of the most comprehensive sources being the Scientific Electronic Library Online (SciELO). There is thus an extensive range of literature originating in Spain and SSLAC freely identifiable and often accessible online, and with the potential to provide useful inputs to the study of epidemiology and public health provided that any reluctance to explore these resources can be overcome. In this article we provide an introduction to such resources. PMID:19243576

Fungal monitoring of the indoor air of the Museo de La Plata Herbarium, Argentina.

PubMed

Mallo, Andrea C; Elíades, Lorena A; Nitiu, Daniela S; Saparrat, Mario C N

Biological agents, such as fungal spores in the air in places where scientific collections are stored, can attack and deteriorate them. The aim of this study was to gather information on the indoor air quality of the Herbarium of Vascular Plants of the Museo de Ciencias Naturales de La Plata, Argentina, in relation to fungal propagules and inert particles. This study was made using a volumetric system and two complementary sampling methods: (1) a non-viable method for direct evaluation, and (2) a viable method by culture for viable fungal propagules. The non-viable method led to ten spore morphotypes being found from related fungal sources. A total of 4401.88spores/m 3 and 32135.18 inert suspended particles/m 3 were recorded. The viable method led to the finding of nine fungal taxa as viable spores that mostly belonged to anamorphic forms of Ascomycota, although the pigmented yeast Rhodotorula F.C. Harrison (Basidiomycota) was also found. A total count of 40,500fungal CFU/m 3 air was estimated for all the sites sampled. Both the non-viable and viable sampling methods were necessary to monitor the bio-aerosol load in the La Plata Herbarium. The indoor air of this institution seems to be reasonably adequate for the conservation of vascular plants due to the low indoor/outdoor index, low concentrations of air spores, and/or lack of indicators of moisture problems. Copyright © 2016 Asociación Española de Micología. Publicado por Elsevier España, S.L.U. All rights reserved.

Association between Facebook Dependence and Poor Sleep Quality: A Study in a Sample of Undergraduate Students in Peru

PubMed Central

Wolniczak, Isabella; Cáceres-DelAguila, José Alonso; Palma-Ardiles, Gabriela; Arroyo, Karen J.; Solís-Visscher, Rodrigo; Paredes-Yauri, Stephania; Mego-Aquije, Karina; Bernabe-Ortiz, Antonio

2013-01-01

Objectives Internet can accelerate information exchange. Social networks are the most accessed especially Facebook. This kind of networks might create dependency with several negative consequences in people’s life. The aim of this study was to assess potential association between Facebook dependence and poor sleep quality. Methodology/Principal Findings A cross sectional study was performed enrolling undergraduate students of the Universidad Peruana de Ciencias Aplicadas, Lima, Peru. The Internet Addiction Questionnaire, adapted to the Facebook case, and the Pittsburgh Sleep Quality Index, were used. A global score of 6 or greater was defined as the cutoff to determine poor sleep quality. Generalized linear model were used to determine prevalence ratios (PR) and 95% confidence intervals (95%CI). A total of 418 students were analyzed; of them, 322 (77.0%) were women, with a mean age of 20.1 (SD: 2.5) years. Facebook dependence was found in 8.6% (95% CI: 5.9%–11.3%), whereas poor sleep quality was present in 55.0% (95% CI: 50.2%–59.8%). A significant association between Facebook dependence and poor sleep quality mainly explained by daytime dysfunction was found (PR = 1.31; IC95%: 1.04–1.67) after adjusting for age, sex and years in the faculty. Conclusions There is a relationship between Facebook dependence and poor quality of sleep. More than half of students reported poor sleep quality. Strategies to moderate the use of this social network and to improve sleep quality in this population are needed. PMID:23554978

Indicators of environmental contamination by heavy metals in leaves of Taraxacum officinale in two zones of the metropolitan area of Mexico City.

PubMed

Gómez-Arroyo, Sandra; Barba-García, Arisbel; Arenas-Huertero, Francisco; Cortés-Eslava, Josefina; de la Mora, Michel Grutter; García-Martínez, Rocío

2018-02-01

The present study was designed to detect the effect of heavy metals in two zones of the Metropolitan Area of Mexico City (MAMC), the Centro de Ciencias de la Atmósfera (CCA), and the Altzomoni station in the Iztaccíhuatl-Popocatépetl National Park. Taraxacum officinale was selected as the indicator organism of responses to atmospheric contamination by heavy metals. Determinations of heavy metals were performed, and total mRNA was extracted to quantify the expression of microRNA398 (miR398), superoxide dismutase 2 (CSD2), and the amounts of free radicals using the bromide of 3-(4,5-dimethylthiazole-2-ilo)-2,5-diphenyltetrazole (MTT) salts reduction assay. Results from the Altzomoni station showed high concentrations of five heavy metals, especially Aluminum, while three heavy metals were identified in the CCA-UNAM zone, most importantly, Vanadium, both in the dry season; miR398 expression presented subtle changes but was greater in the leaves from the stations with higher concentrations of heavy metals. Observations included a significant expression of CSD2, mainly in the dry season in both study zones, where levels were significant with respect to controls (p < 0.05). Reduced MTT was also higher in the dry season than in the rainy season (p < 0.05). In conclusion, the increase in heavy metals on the leaves of Taraxacum officinale induces increased expression of the CSD2 gene and reduced MTT; thus, they can be used as indicators for biomonitoring heavy metal concentrations.

South American regional ionospheric maps computed by GESA: A pilot service in the framework of SIRGAS

NASA Astrophysics Data System (ADS)

Brunini, C.; Meza, A.; Gende, M.; Azpilicueta, F.

2008-08-01

SIRGAS (Geocentric Reference Frame for the Americas) is an international enterprise of the geodetic community that aims to realize the Terrestrial Reference Frame in the America's countries. In order to fulfill this commitment, SIRGAS manages a network of continuously operational GNSS receivers totalling around one hundred sites in the Caribbean, Central, and South American region. Although the network was not planed for ionospheric studies, its potential to be used for such a purpose was recently recognized and SIRGAS started a pilot experiment devoted to establish a regular service for computing and releasing regional vertical TEC (vTEC) maps based on GNSS data. Since July, 2005, the GESA (Geodesia Espacial y Aeronomía) laboratory belonging to the Facultad de Ciencias Astronómicas y Geofísicas of the Universidad Nacional de La Plata computes hourly maps of vertical Total Electron Content (vTEC) in the framework of the SIRGAS pilot experiment. These maps exploit all the GNSS data available in the South American region and are computed with the LPIM (La Plata Ionospheric Model). LPIM implements a de-biasing procedure that improves data calibration in relation to other procedures commonly used for such purposes. After calibration, slant TEC measurements are converted to vertical and mapped using local-time and modip latitude. The use of modip latitude smoothed the spatial variability of vTEC, especially in the South American low latitude region and hence allows for a better vTEC interpolation. This contribution summarizes the results obtained by GESA in the framework of the SIRGAS pilot experiment.

Alfabetización astronómica

NASA Astrophysics Data System (ADS)

Tignanelli, H.

A fines de 1991, en una revista de educación en ciencias, José L. Sérsic reflexionaba acerca de los problemas que enfrentaría la enseñanza de los conocimientos astronómicos en nuestro país, en los umbrales del Siglo XXI. Entonces postulaba como un objetivo mínimo, que los jóvenes deberían mostrar signos claros de que se hallan astronómicamente alfabetizados. Era el año en que se realizaba por primera vez una Asamblea General de I.A.U. en Buenos Aires, una oportunidad de singulares características para la comunidad astronómica local y, simultáneamente el comienzo de un cambio radical en la estructura del sistema educativo argentino. ?`Contempla ese cambio el objetivo que postulara Sérsic? ?`Estamos en condiciones de afirmar que estamos en camino de lograrlo? ?`Con qué parámetros?. Presentamos aquí un panorama general sobre algunas de las acciones realizadas en función de alcanzar esa alfabetización científica, analizando exclusivamente la actividad de enseñanza hasta el nivel universitario, sin detenernos en el mismo, ya que lo consideramos una instancia superior e independiente de aquella alfabetización. Tampoco nos referiremos a la tarea de difusión, divulgación o popularización de la Astronomía, ya que su condición de asistemática y subjetiva no es evaluable en términos de la formación integral de un individuo.

The Gemini NICI Planet-Finding Campaign: The Companion Detection Pipeline

NASA Astrophysics Data System (ADS)

Wahhaj, Zahed; Liu, Michael C.; Biller, Beth A.; Nielsen, Eric L.; Close, Laird M.; Hayward, Thomas L.; Hartung, Markus; Chun, Mark; Ftaclas, Christ; Toomey, Douglas W.

2013-12-01

We present high-contrast image processing techniques used by the Gemini NICI Planet-Finding Campaign to detect faint companions to bright stars. The Near-Infrared Coronographic Imager (NICI) is an adaptive optics instrument installed on the 8 m Gemini South telescope, capable of angular and spectral difference imaging and specifically designed to image exoplanets. The Campaign data pipeline achieves median contrasts of 12.6 mag at 0.''5 and 14.4 mag at 1'' separation, for a sample of 45 stars (V = 4.3-13.9 mag) from the early phase of the campaign. We also present a novel approach to calculating contrast curves for companion detection based on 95% completeness in the recovery of artificial companions injected into the raw data, while accounting for the false-positive rate. We use this technique to select the image processing algorithms that are more successful at recovering faint simulated point sources. We compare our pipeline to the performance of the Locally Optimized Combination of Images (LOCI) algorithm for NICI data and do not find significant improvement with LOCI. Based on observations obtained at the Gemini Observatory, which is operated by the Association of Universities for Research in Astronomy, Inc., under a cooperative agreement with the NSF on behalf of the Gemini partnership: the National Science Foundation (United States), the Science and Technology Facilities Council (United Kingdom), the National Research Council (Canada), CONICYT (Chile), the Australian Research Council (Australia), Ministério da Ciência e Tecnologia (Brazil) and Ministerio de Ciencia, Tecnología e Innovación Productiva (Argentina).

Socio-economic costs of osteoarthritis: a systematic review of cost-of-illness studies.

PubMed

Puig-Junoy, Jaume; Ruiz Zamora, Alba

2015-04-01

The burden of illness that can be attributed to osteoarthritis is considerable and ever increasing. The aim of this systematic review is to analyze currently available data derived from cost-of-illness studies on the healthcare and non-healthcare costs of osteoarthritis. PubMed, Index Medicus Español (IME), and the Spanish Database of Health Sciences [Índice Bibliográfico Español en Ciencias de la Salud (IBECS)] were searched up to the end of April 2013. This study adhered to the PRISMA guidelines. Articles were reviewed and the study quality assessed by two independent investigators with consensus resolution of discrepancies. We identified 39 studies that investigated the socio-economic cost of osteoarthritis. Only nine studies took a social perspective. Rather than estimating the incremental cost of osteoarthritis, nine studies estimated the total cost of treating patients with osteoarthritis without a control for comorbidity. The other 30 studies determined the incremental cost with or without a control group. Only nine studies assessed a comprehensive list of healthcare resources. The annual incremental healthcare costs of generalized osteoarthritis ranged from €705 to €19,715. The annual incremental non-healthcare-related costs of generalized osteoarthritis ranged from €432 to €11,956. The study concludes that the social cost of osteoarthritis could be between 0.25% and 0.50% of a country׳s GDP. This should be considered in order to foster studies that take into account both healthcare and non-healthcare costs. Copyright © 2014 Elsevier Inc. All rights reserved.