Science.gov

Sample records for dudosa ciencia raza

  1. Viva La Raza!

    ERIC Educational Resources Information Center

    Palomares, Uvaldo H.

    1971-01-01

    Viva La Raza is the rallying cry of the Chicano movement. Viva La Raza illustrates the historical forces that spark its present eruption and the current pressures for social change from new and dynamic leadership. (Author)

  2. La Raza: Forgotten Americans.

    ERIC Educational Resources Information Center

    Samora, Julian, Ed.

    An effort to assess the status of the more than 4 million Spanish-speaking Americans (La Raza) in the Southwestern 5-state area of California, Texas, New Mexico, Arizona, and Colorado resulted in this collection of papers. The historical perspective of the positive factors in the development and persistence of the Spanish language is examined. The…

  3. Mujeres de La Raza (Women of the Race).

    ERIC Educational Resources Information Center

    National Hispanic Univ., Oakland, CA.

    This unit profiles nine women of La Raza who have contributed to the betterment of humanity and Hispanic culture. It encourages students to learn about them and other Raza women as models of people involved in the Chicano community. The unit, offered in both Spanish and English, also teaches that these representative Raza women had to overcome…

  4. Toward the Development of a Raza Cinema.

    ERIC Educational Resources Information Center

    Camplis, Francisco X.

    Chicano teatro, poetry, and art appear to be more developed forms of Chicano cultural expression. Chicano literature and film are just getting off the ground. Film is the least developed of the two, primarily because it is an expensive medium. However, this medium can be a tool for social change. "Raza Cinema" could Conceivably include in addition…

  5. Toward a Chicano/Raza Bibliography: Drama, Prose, Poetry

    ERIC Educational Resources Information Center

    Romano, Octavio I. V. Ed.; Rios, Herminio C. Ed.

    1973-01-01

    Separated into 3 sections, this bibliography covers literature, drama, prose, and poetry (from 1965 to 1972) pertaining to Chicanos and La Raza. To obtain this material, all Chicano journals, newspapers, bulletins, and newsletters published in the Southwest were reviewed. Topics range from police brutality to the Vietnam War. The appendix gives…

  6. El Dia de la Raza Module. Secondary Level. [The Day of the Race Module. Secondary Level.

    ERIC Educational Resources Information Center

    Herrera, Gloria; Lizcano, Jeanette

    "El Dia de la Raza", considered the birthday of the mestizo, is the topic of this unit for the secondary level. As unit objectives, the students are to demonstrate (1) their comprehension by stating 3 major areas of contributions the Indians and the Spaniards gave the mestizo culture and (2) their concept of mestizaje by participating in oral…

  7. Casa De La Raza: Separatism or Segregation -- Chicanos in Public Education.

    ERIC Educational Resources Information Center

    Southwest Network, Hayward, CA.

    Casa de la Raza, a K-12 grade school, operated from September 1971 to June 1973 as part of the Berkeley Unified School District's Experimental Schools Program. Based on the belief that using the student's home culture and language within the instructional program would foster personal growth and academic advancement, Casa used a bilingual…

  8. The Development of La Raza Community Leadership and Its Impact on Social Problems -- A Causal Model.

    ERIC Educational Resources Information Center

    Rivera, Felix G.

    The paper introduces a 3-level paradigm for community assessment. First, Raza communities are conceptualized as belonging to three phases--culturally homogeneous, culturally in transition, and culturally heterogeneous. Each phase is determined by the proximity of the cities'"barrios" to the home country (Mexico, Puerto Rico, Central America) and…

  9. Problem-Solving Research: Strategic Engagement in Community Development and the Resource Center for Raza Planning.

    ERIC Educational Resources Information Center

    Cordova, Teresa

    2002-01-01

    The Resource Center for Raza Planning (RCRP) at the University of New Mexico helps Mexican American college students use research to meet the needs of their communities. The formation and early development of RCRP are described, followed by its work on policy and planning related to community economic development. Implications for universities…

  10. Selected Bibliography Pertaining to: La Raza in the Midwest and Great Lake States (1924-1973). Revised, June 1973.

    ERIC Educational Resources Information Center

    Notre Dame Univ., IN.

    The selected bibliography on "La Raza" in the Midwest and Great Lakes States lists dissertations, theses, periodical articles, State publications, hearing transcripts, and Federal reports published between 1924-73. Focusing on labor trends, particularly in the migrant field, the bibliography also covers religion, culture, language differences,…

  11. Ciencias 1. (Science 1). [Student's Workbook].

    ERIC Educational Resources Information Center

    Raposo, Lucilia

    Ciencias 1 is the first in a series of science books designed for elementary Portuguese-speaking students. The book contains five sections divided into 43 lessons. The five sections are (1) Matter, (2) The Human Body, (3) Weather, (4) Solids, Liquids, and Gases, and (5) Living Things. Pictorial presentations and picture exercises are included for…

  12. Ciencias 2 (Science 2). [Student's Workbook].

    ERIC Educational Resources Information Center

    Raposo, Lucilia

    Ciencias 2 is the second in a series of elementary science textbooks written for Portuguese-speaking students. The text develops the basic skills that students need to study their surroundings and observe natural facts and phenomena by following scientific methods. The book is composed of 10 chapters and includes 57 lessons. Topics included are…

  13. A Report on the National Institute of Education/National Education Task Force de la Raza Symposium (Albuquerque, New Mexico, July 25-26, 1974).

    ERIC Educational Resources Information Center

    Esquibel, Antonio; Casso, Henry J.

    Participating in the "NIE/National Education Task Force de la Raza Symposium" were 57 of the nation's top Chicano educators. During the Symposium's 2 days, these Chicano educators interacted with 5 National Institute of Education (NIE) staff members. Objectives of the Symposium included: (1) to review NIE's 1975-76 Multicultural Agenda; (2) to…

  14. Ciencias 2. Manual do Professor (Science Teacher's Manual).

    ERIC Educational Resources Information Center

    Raposo, Lucilia

    This is the teacher's manual for Ciencias 2, the second in a series of elementary science textbooks for Portuguese-speaking students. The student textbook contains 10 chapters and 57 activities. The teacher's manual presents an explanation of the educational goals and the organization of the content, Topics included are environment, the human,…

  15. Ciencias 1. Manual do Professor (Science 1. Teacher's Manual).

    ERIC Educational Resources Information Center

    Raposo, Lucilia

    This is the teacher's guide for Ciencias 1, the first in a series of science books designed for Portuguese-speaking students in elementary schools. The guide contains materials corresponding to the student's book. Included are five sections comprised of 43 lessons. The teacher's guide also contains lesson objectives, suggestions for lesson…

  16. Actitudes de los candidatos y maestros de ciencias en servicio acerca del uso de las herramientas computadorizadas en las clases de ciencias

    NASA Astrophysics Data System (ADS)

    Bayuelo, Ezequiel

    Este estudio examino y comparo las actitudes de los candidatos a maestros de ciencias y los maestros de ciencias en servicio acerca de la utilizacion de las herramientas computadorizadas en las clases de ciencias. Tambien identifico y diferencio el uso que ellos dan a estas herramientas en las clases de ciencias. Este estudio presenta un diseno descriptivo exploratorio. Constituyeron la muestra trescientos diez sujetos que fueron candidatos a maestros de ciencias o maestros de ciencias en servicio. Para recoger los datos se construyo y valido un cuestionario de treinta y un itemes. Se utilizaron las pruebas estadisticas no parametricas Kruskal Wallis y Chi-cuadrado (test de homogeneidad) para establecer las diferencias entre las actitudes de los sujetos con relacion al uso de las herramientas computadorizadas en las clases de ciencias. Los hallazgos evidenciaron que son positivas y muy parecidas las actitudes de los candidatos a maestros y maestros en servicio hacia el uso de las herramientas computadorizadas. No hubo diferencias entre los candidatos y maestros en servicio en terminos de las actitudes de confianza y empatia hacia el uso de las herramientas computadorizadas en las clases de ciencias. En aspectos como el uso del banco de datos bibliografico Eric y el uso de las herramientas computadorizadas en actividades educativas como explorar conceptos, conceptuar, aplicar lo aprendido y hacer asignaciones hubo diferencias estadisticamente significativas entre los candidatos y los maestros en servicio. Al comparar las frecuencias observadas con las esperadas hubo mas maestros en servicio y menos candidatos que indicaron usar el anterior banco de datos y las herramientas computadorizadas en las mencionadas actividades educativas.

  17. Las ideologias, las ciencias naturales y sus implicaciones en la educacion cientifica

    NASA Astrophysics Data System (ADS)

    Lozada Roldan, Sandra

    Este estudio ausculto las concepciones epistemologicas de los docentes de ciencia del nivel secundario con relacion a las ideologias y las ciencias naturales. Tambien examino las posiciones de los docentes ante asuntos publicos relacionados a la ciencia. Para propositos de este estudio se diseno y se valido el cuestionario con el cual se obtuvieron los resultados. La investigacion es de tipo cuantitativa y se utilizo como diseno la encuesta. El cuestionario se administro en varias actividades de desarrollo profesional para maestros de ciencia. Un total de 78 maestros del nivel secundario respondieron el cuestionario. Para analizar los datos obtenidos se utilizaron estadisticas descriptivas como la distribucion de frecuencia y el porciento. Ademas se establecieron codigos y categorias para describir las posiciones de los maestros ante asuntos publicos relacionados a la ciencia. Los analisis demostraron que entre los docentes participantes de este estudio prevalecen ciertas concepciones epistemologicas adecuadas acerca de las ciencias naturales, a la luz de la literatura consultada. Entre estas concepciones se destacan las siguientes: a) la filosofia materialista de las ciencias naturales, b) la naturaleza tentativa y constructivista del conocimiento cientifico, c) el uso de una metodologia que garantiza cierto grado de objetividad y con el que se justifican y validan los enunciados cientificos y d) la funcion instrumental del conocimiento cientifico. Sin embargo, entre los docentes participantes de este estudio prevalecen ciertas concepciones epistemologicas erroneas acerca de las ciencias naturales, a la luz de la literatura consultada. Entre estas concepciones se destacan las siguientes: a) tendencia inductivista en el que las teorias cientificas comienzan con observaciones que establecen generalizaciones, b) secuencia jerarquica de la metodologia cientifica. Ademas, entre los docentes participantes de este estudio prevalecen concepciones epistemologicas adecuadas

  18. La problematica de la demarcacion entre ciencia y pseudociencia y sus implicaciones en la educacion cientifica

    NASA Astrophysics Data System (ADS)

    Jimenez Tolentino, Dinorah

    2011-12-01

    En la sociedad prevalece una tendencia generalizada hacia la inclusion de creencias y practicas pseudocientificas. Esta investigacion responde a la necesidad de analizar como la proliferacion de las pseudociencias afecta la vision que tienen los estudiantes universitarios sobre las ciencias naturales. A tales efectos, la investigadora describe las concepciones epistemologicas que tienen los estudiantes sobre las ciencias y las pseudociencias e identifica los criterios de demarcacion, entre un area y otra, que se derivan de estas concepciones. De igual modo, esta identifica las creencias y practicas pseudocientificas de mayor arraigo entre los estudiantes, destacando, a su vez, la razon de ser de las mismas. Por ultimo, la investigadora analiza las implicaciones educativas de la problematica de la demarcacion entre ciencia y pseudociencia. La investigacion es de naturaleza mixta, enmarcada en los paradigmas empirico- analitico y cualitativo. El proceso investigativo se llevo a cabo mediante la administracion del cuestionario Criterios para la demarcacion entre ciencia y pseudociencia. La parte cualitativa estuvo enmarcada en el diseno de estudio de caso, recopilando informacion mediante entrevistas semiestructuradas en dos grupos focales. La poblacion de estudio estuvo constituida por estudiantes universitarios del nivel subgraduado de la Universidad Central de Bayamon. Los resultados del estudio reflejaron las concepciones erroneas de los estudiantes sobre la naturaleza de las ciencias y las pseudociencias. Con respecto a la demarcacion entre ciencia y pseudociencia, el criterio imperante entre los universitarios es el de la verificabilidad, considerando la aplicacion del metodo cientifico como el metodo para demostrar la veracidad de las teorias cientificas. Las creencias y practicas pseudocientificas no son muy frecuentes entre los universitarios. Estos atribuyen las mismas a la prevalencia de elementos supersticiosos y al engano a que es sometida la poblacion

  19. El aprendizaje significativo en las ciencias al participar en proyectos de investigacion cientifica

    NASA Astrophysics Data System (ADS)

    Mora Polanco, Miguelena

    La ciencia es el eje fundamental a traves del cual se desarrollan las habilidades necesarias para el pensar cientifico que va a la busqueda del conocimiento cientifico. La intencion de este estudio fue indagar en el tema de investigacion cientifica desde el punto de vista de los participantes en los siguientes aspectos relacionados con la experiencia de investigacion cientifica: a) conceptos, b) proceso, c) destrezas y d) disposicion. Tambien se analizaron: a) las perspectivas del metodo cientifico, b) la estrategia de ensenanza, c) la cultura cientifica y d) la exposicion del proyecto investigativo en la Feria Cientifica; como parte del aprendizaje significativo de la ciencias de los participantes. Esta investigacion cualitativa propuso como diseno el estudio de caso. Los aspectos relacionados a la experiencia de participar en proyecto de investigacion cientifica son el fenomeno o caso bajo estudio. En el estudio participaron cinco (5) estudiantes egresados de escuela publica o privada que cursaban hasta el tercer ano de estudios universitarios, conducentes a un bachillerato en educacion secundaria en ciencias o en ciencias naturales. Las tecnicas utilizadas para recopilar los datos fueron: analisis de documentos del DEPR, revision de artefactos y entrevistas profundas. Para el analisis de los datos de las entrevistas se utilizo el modelo de Wolcott (1994). Del analisis de documentos del DEPR se identificaron areas a mejorar en las guias de las cartas circulares con relacion a la investigacion escolar y la feria cientifica. El analisis de los artefactos proveyo evidencia de como los internados, simposios e investigaciones fomentan el que los estudiantes se superen en el aspecto cognitivo, se conviertan en creadores del conocimiento, al hacer suyo los conceptos para poder explicarlos al publico. De las entrevistas los participantes manifestaron que la experiencia de investigacion fue una de aprendizaje significativo que los marco para toda la vida y les expandio su

  20. Investigaccion-accion en la sala de clases sobre las creencias de la cultura de la ciencia de un grupo de estudiantes universitarios y su relacion reciproca con el aprendizaje de las ciencias biologicas

    NASA Astrophysics Data System (ADS)

    Cordova-Santiago, Lizzette Astrid

    La investigacion---accion que se llevo a cabo en la sala de clases tenia como punto de partida las creencias de la cultura de la ciencia de un grupo de estudiantes universitarios para luego examinar sus implicaciones en el proceso de aprendizaje de las Ciencias Biologicas. ¿Que se supone que hagan las creencias en relacion con el aprendizaje? ¿En que consiste incorporar este aspecto a la practica educativa universitaria? Utilizando el modelo de Kemmis y McTaggart (1987) la investigacion-accion se planteo como un proceso dinamico en cuatro momentos en espiral constituidos por la planificacion, la accion, la observacion y la reflexion. Cada una de las fases tuvo una intencion retrospectiva y prospectiva formando una espiral de autorreflexion del conocimiento y la accion. Se llevaron a cabo audio grabaciones en clases y analisis de documentos. Ademas, la profesora-investigadora hizo un portafolio para reflexionar sobre las creencias de la cultura de la ciencia que tienen los estudiantes y las creencias del aprendizaje que tiene la profesora y sobre como la comprension de estos elementos ayudo a mejorar su practica educativa a traves del tiempo. Los resultados obtenidos apuntan a que las creencias de la cultura de la ciencia que tiene el grupo de estudiantes son diversas. Ellos si creen que la ciencia tiene una cultura la cual describieron como: complicada y desconocida que evoluciona constantemente, que es un conjunto de metodos, que es altamente tecnologica, que resuelve problemas de salud, ayuda a interpretar la realidad del mundo que los rodea y su origen y que existen unas intersecciones entre la ciencia y el poder. Sobre las creencias del proceso de aprendizaje de la profesora-investigadora, estas senalan que el modelaje de actores, la vision de la academia que tiene ella asi como la participacion y negociacion entre todos los involucrados en el proceso educativo, son factores que inciden en el proceso de aprendizaje.

  1. [Experience in liver transplantation (1996-2011) at the UMAE, General Hospital Gaudencio González Garza, National Medical Center La Raza, Mexican Institute of Social Security, Mexico City, D.F].

    PubMed

    Hernández-Domínguez, José Mariano; Holm-Corzo, Alberto; Santos-Caballero, Marlene; Porras-Ramos, Miguel Angel; Gómez-Casanova, Pedro; Pérez-Molina, Lorenzo; Villaseñor-Colín, César; Muñiz-Toledo, Vérulo; López-Sánchez, Héctor; Hernández-Becerril, Hector; Espinosa-González, Alfonso; Martínez-Jiménez, Oscar; Torres-Amaya, Mario; D'ector-Lira, Dulce; Medina-Ramírez, Marino; Sanabria-Trujillo, Giovanni; Villafuerte-Muñoz, Gloria; Alanís-Jacobo, Verenice; Rocha-Avila, Gustavo; Zaldívar-Cervera, Jaime

    2011-09-01

    We present the experience of General Hospital CMN La Raza from 1996 to 2011. In this period, we have made 40 liver transplants in adults and 22 pediatric liver transplants. A 100% of adult population received a graft from deceased donor; while in the pediatric age group, 60% were from deceased donor and 40% from living donor. The long-term follow-up is shown only for adult group due to lack of data in the pediatric group. The mean age for the adult group is 42 years old and 4.5 years for the pediatric group. The main indications for liver transplantation in adults were: cirrhosis due to chronic hepatitis C in 47.5% and cirrhosis due to alcohol abuse in 15% of the group. In the pediatric group was more likely the biliary atresia (60%) as an indication for liver transplantation followed by fulminant hepatitis (15%). We show the evolution of the hepatectomy's technique in the adult group: it was initially using conventional technique and later it changed to preservation of cava vein (Piggy Back). In the same way, the reconstruction of the bile-duct was initially made using a T-tube stenting and currently, we use end to end bile-duct reconstruction. The patient's survival at 1, 5, and 10 years was 41.5, 27.2, and 13.6%, respectively; with a median of global survival of 6.2 months. Long-term patient's survival has improved after 2004 compared to previous period.

  2. Conceptuaciones de los estudiantes de las facultades de educacion y ciencias naturales de la Universidad de Puerto Rico, recinto de Rio Piedras, acerca de la ciencia y la pseudociencia

    NASA Astrophysics Data System (ADS)

    Reyes Medina, Hector A.

    Esta investigacion describe las conceptuaciones de los estudiantes de tercer ano o mas a nivel de bachillerato de los programas de Educacion en Ciencia y Ciencias Naturales de la Universidad de Puerto Rico, Recinto de Rio Piedras, acerca de lo establecido en la literatura para distinguir el conocimiento cientifico de las creencias pseudocientificas. Este estudio se guio por un diseno tipo encuesta transversal que permitio conocer de manera consistente las conceptuaciones de los estudiantes encuestados acerca de la Ciencia y la Pseudociencia. Ademas, permitio desarrollar inferencias estadisticas relacionadas a la poblacion de estudio, sus conceptuaciones y su inclinacion teorica en torno al Realismo y al Racionalismo cientifico moderados. El instrumento utilizado fue el Cuestionario acerca de las concepciones de la ciencia y la pseudocienca en estudiantes universitarios, Reyes (2015). Este cuestionario fue validado mediante la recopilacion de diversas fuentes de evidencias, entre estas se encuentran las evidencias basadas en el contenido, el proceso de respuesta, la estructura interna y de constructo. Tambien, se calculo el Alfa de Crombach para la escala total y para cada componente y se realizo un analisis de factores que demostro la presencia de seis componentes claramente definidos de acuerdo a lo esperado sobre las caracteristicas originales del instrumento. Las estadisticas utilizadas fueron descriptivas. Participaron 302 alumnos, de las facultades de educacion y ciencias naturales. Se encontro que las conceptuaciones de los estudiantes de ambas facultades se inclinan en un 66.2% a favor con lo establecido en el modelo teorico en torno al Realismo y al Racionalismo cientifico moderados. Sin embargo, aun hay un 33.8% de los estudiantes de ambas facultades que poseen conceptuaciones distintas al modelo teorico propuesto.

  3. Can a Spanish Science Education Journal Become International? The Case of "Enseñanza De Las Ciencias"

    ERIC Educational Resources Information Center

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

    2015-01-01

    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…

  4. [Experience in liver transplantation (1996-2011) at the UMAE, General Hospital Gaudencio González Garza, National Medical Center La Raza, Mexican Institute of Social Security, Mexico City, D.F].

    PubMed

    Hernández-Domínguez, José Mariano; Holm-Corzo, Alberto; Santos-Caballero, Marlene; Porras-Ramos, Miguel Angel; Gómez-Casanova, Pedro; Pérez-Molina, Lorenzo; Villaseñor-Colín, César; Muñiz-Toledo, Vérulo; López-Sánchez, Héctor; Hernández-Becerril, Hector; Espinosa-González, Alfonso; Martínez-Jiménez, Oscar; Torres-Amaya, Mario; D'ector-Lira, Dulce; Medina-Ramírez, Marino; Sanabria-Trujillo, Giovanni; Villafuerte-Muñoz, Gloria; Alanís-Jacobo, Verenice; Rocha-Avila, Gustavo; Zaldívar-Cervera, Jaime

    2011-09-01

    We present the experience of General Hospital CMN La Raza from 1996 to 2011. In this period, we have made 40 liver transplants in adults and 22 pediatric liver transplants. A 100% of adult population received a graft from deceased donor; while in the pediatric age group, 60% were from deceased donor and 40% from living donor. The long-term follow-up is shown only for adult group due to lack of data in the pediatric group. The mean age for the adult group is 42 years old and 4.5 years for the pediatric group. The main indications for liver transplantation in adults were: cirrhosis due to chronic hepatitis C in 47.5% and cirrhosis due to alcohol abuse in 15% of the group. In the pediatric group was more likely the biliary atresia (60%) as an indication for liver transplantation followed by fulminant hepatitis (15%). We show the evolution of the hepatectomy's technique in the adult group: it was initially using conventional technique and later it changed to preservation of cava vein (Piggy Back). In the same way, the reconstruction of the bile-duct was initially made using a T-tube stenting and currently, we use end to end bile-duct reconstruction. The patient's survival at 1, 5, and 10 years was 41.5, 27.2, and 13.6%, respectively; with a median of global survival of 6.2 months. Long-term patient's survival has improved after 2004 compared to previous period. PMID:22916613

  5. 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.

  6. La preparacion en ciencia de los candidatos a maestros del nivel elemental primario segun la reforma de la educacion cientifica en Puerto Rico: Una propuesta de secuencia curricular

    NASA Astrophysics Data System (ADS)

    Rodriguez Plaza, Evelyn

    El proposito de esta investigacion fue identificar los componentes de la preparacion en ciencia que deben recibir los estudiantes del Bachillerato en Artes en Educacion Elemental, Nivel Primario, de acuerdo a los documentos que dirigen la reforma de la educacion cientifica en Puerto Rico. Tambien, se identificaron los componentes de los cursos que forman parte de la preparacion en ciencia de estos estudiantes. Se compararon los componentes de la preparacion en ciencia y los componentes de los cursos para determinar congruencias y discrepancias. Con los datos recopilados se identificaron los componentes de los cursos de una secuencia curricular para la preparacion en ciencia de los candidatos a maestros del nivel elemental primario. La secuencia curricular que se propone en esta investigacion incluye cursos de contenido cientifico y de metodologia en la ensenanza de la ciencia disenados para satisfacer las necesidades de los candidatos. Se recomienda que en los procesos para el diseno, la implantacion y la evaluacion de estos cursos participen profesores de ciencia, profesores de educacion y maestros del nivel elemental primario. Todos los cursos de la secuencia curricular deben tener un enfoque constructivista. Las experiencias educativas que se incluyan en los cursos deben aspirar a desarrollar en los candidatos los atributos de la cultura cientifica y actitudes positivas hacia la ciencia y hacia la ensenanza de esta disciplina. El modelaje por parte de los profesores que ensenen los cursos de la secuencia curricular es fundamental en el desarrollo profesional de los candidatos. Se recomienda que en los cursos de contenido cientifico se estudien los conceptos y los conocimientos cientificos que forman parte del curriculo de Kindergarten a tercer grado de forma integrada y con una profundidad universitaria. Estos cursos deben tener un enfoque interdisciplinario e incluir el estudio de la naturaleza de la ciencia y un componente de laboratorio para desarrollar los

  7. 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.

  8. 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.). 

  9. Historical Basis for a "Raza" Typology.

    ERIC Educational Resources Information Center

    Lux, Guillermo

    Historically, the dominant culture in the United States has, consciously or inadvertently, attempted to assimilate minority cultures -- hence, the term "melting pot". Yet despite several centuries of systematic Americanization, there remains a definite cultural mosaic in the United States. In the post-Melting Pot Era, such terms as Chicano,…

  10. 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.

  11. 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

  12. Analisis del contenido curricular de los Documentos Normativos del Programa de Ciencias en el area de biologia para la escuela superior del sistema de educacion publica de Puerto Rico: 1993-2012

    NASA Astrophysics Data System (ADS)

    Davila Montanez, Melissa

    Esta investigacion de naturaleza cualitativa se ocupo de realizar un analisis de contenido documental de los Documentos Normativos del Programa de Ciencias en el area de biologia de la escuela superior del sistema de educacion publica de Puerto Rico del periodo 1993-2012. Los documentos analizados fueron: Guia Curricular, 1995; Marco Curricular, 2003; Estandares de Excelencia, 1996, 2000 y Estandares de Contenido y Expectativas de Grado, 2007. Se indago si hubo cambios en significados en los Componentes Estructurales: Naturaleza de la ciencia, Paradigmas para la ensenanza de la ciencia, Funcion del curriculo formal, Mision de la ensenanza de la ciencia; Contenidos, destrezas y competencias, Estrategias de ensenanza y Evaluacion/Assessment del aprendizaje. El analisis sugiere que no hubo cambios sustanciales en los significados de los Componentes Estructurales. Los documentos estudiados muestran mayormente caracteristicas similares, aunque los documentos mas recientes eran mas descriptivos, explicativos y especificos.

  13. [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.

  14. 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.

  15. 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)

  16. 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.

  17. 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.

  18. 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

  19. 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…

  20. La Raza: A Selective Bibliography of Library Resources.

    ERIC Educational Resources Information Center

    Tash, Steven, Comp.; Nupoll, Karin, Comp.

    Intended to aid students and faculty to know about the Chicano experience, this bibliography cites 3,173 sources, covering the period between 1878 and 1972, found at the California State University library. Because of the interdisciplinary nature of the Chicano experience, the materials have been arranged according to the Library of Congress list…

  1. 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…

  2. 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

  3. 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.

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

    PubMed Central

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

    2014-01-01

    Abstract 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. PMID:24899851

  5. 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…

  6. 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)

  7. 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

  8. 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

  9. [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 %.

  10. 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 language is…

  11. News Teaching Support: New schools network launched Competition: Observatory throws open doors to a select few Festival: Granada to host 10th Ciencia en Acción Centenary: Science Museum celebrates 100 years Award: Queen's birthday honour for science communicator Teacher Training: Training goes where it's needed Conference: Physics gets creative in Christchurch Conference: Conference is packed with ideas Poster Campaign: Bus passengers learn about universe Forthcoming events

    NASA Astrophysics Data System (ADS)

    2009-09-01

    Teaching Support: New schools network launched Competition: Observatory throws open doors to a select few Festival: Granada to host 10th Ciencia en Acción Centenary: Science Museum celebrates 100 years Award: Queen's birthday honour for science communicator Teacher Training: Training goes where it's needed Conference: Physics gets creative in Christchurch Conference: Conference is packed with ideas Poster Campaign: Bus passengers learn about universe Forthcoming events

  12. 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.

  13. 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,…

  14. 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,…

  15. 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

  16. Breast cancer quality of life evaluation in Mexican Women at La Raza Hospital, Mexico City: A preliminary approach

    PubMed Central

    Gómez-Rico, Jacobo Alejandro; Altagracia-Martínez, Marina; Kravzov-Jinich, Jaime; Cárdenas-Elizalde, Rosario; Hinojosa-Cruz, Juan Carlos; Rubio-Poo, Consuelo

    2009-01-01

    Breast cancer (BC) is the second leading cause of death among Mexican women over 40 years of age. This study aimed to identify and examine the effects of cancer stage and surgical treatment on the quality of life (QOL) of Mexican women with early stage breast cancer (ESBC) treated with either modified radical mastectomy (MRM) or breast conservative surgery (BCS), plus adjuvant chemotherapy. The QLQ-C30 and QLQ BR-23 questionnaires were used to assess QOL. Sociodemographic characteristics and clinical factors of 102 women with early BC were also evaluated; analysis of variance (ANOVA) was performed and a statistical significance of p < 0.05 was assumed. Most women were of reproductive age. Meaningful differences in QOL as a result of surgical treatment, in women receiving BCS compared with those receiving MRM, were limited to body image. We conclude that MRM and BCS are essentially equivalent choices in terms of QOL, with the exception of the impact on body image. In general, women who received BCS had a better perceived QOL. PMID:21935301

  17. A National Council of La Raza Report on Impact of Limited Federal Statistical Data/Information on Hispanic Americans.

    ERIC Educational Resources Information Center

    Olivas, Roberto

    In a technologically advanced society, many of the dialogues take place within the "management information system," or as a result of the "hard data" acquired through such a system, rather than in a public forum. The absence of the Hispanic American from that type of systems dialogue can and does place unnecessary disadvantages on Hispanic…

  18. 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

  19. 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.

  20. 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…

  1. 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;…

  2. 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…

  3. 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)

  4. 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;…

  5. 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…

  6. 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…

  7. 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)

  8. 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…

  9. 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…

  10. ASTROMOL: moles de ciencia y divulgación

    NASA Astrophysics Data System (ADS)

    Ruiz-Zelmanovitch, N.; Castellanos, M.

    2015-05-01

    ASTROMOL is the nickname of the project ``Consolider-Ingenio 2010 ASTROMOL, Molecular Astrophysics: The Herschel and ALMA era'', a program that comes to an end soon and in which we have obtained important results and both scientific and technological advances. In this presentation we will discuss these results and the tools we have used to spread them to the society.

  11. Ciencia en la Estación Espacial Internacional

    NASA Video Gallery

    Durante más de 10 años, los seres humanos vivieron en la estación espacial las 24 horas, los siete días de la semana Y llevaron a cabo más de 600 experimentos. Fíjate apenas algunos de estos experi...

  12. 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…

  13. Raza de Tesoros. Programa de Lectura y Ensenanza del Lenguaje, Unidad B (Race of Treasures. Reading and Language Learning Program, Unit B).

    ERIC Educational Resources Information Center

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

    This Spanish reader is 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 Mexican-American student. The goals of the program…

  14. Raza de Tesoros. Programa de Lectura y Ensenanza del Lenguaje, Unidad B. Cuaderno de Trabajo (Race of Treasures. Reading and Language Learning Program, Unit B. Workbook).

    ERIC Educational Resources Information Center

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

    This workbook in Spanish accompanies the reader that is 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 Mexican-American…

  15. 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…

  16. 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.

  17. 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…

  18. 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…

  19. 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.

  20. 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…

  1. 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…

  2. 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…

  3. "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…

  4. 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…

  5. 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)

  6. 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.…

  7. 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)

  8. 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.

  9. 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.

  10. La Ciencia y el Laboratorio Científico de Marte

    NASA Video Gallery

    el robot más nuevo fabricado para Marte es el Laboratorio Científico de Marte o Curiosity. ¡Se encuentra listo para deambular por el planeta rojo con el mayor y más avanzado conjunto de instrumento...

  11. 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.

  12. 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…

  13. 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.

  14. 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…

  15. 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…

  16. 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…

  17. "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…

  18. 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…

  19. 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…

  20. 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…

  1. "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.

  2. 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.

  3. 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.

  4. 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

    ... Raza; Filing of Food Additive Petition AGENCY: Food and Drug Administration, HHS. ACTION: Notice of... National Council of La Raza have jointly filed a petition proposing that the food additive regulations be... a food additive petition (FAP 2A4796) has been jointly filed by Gruma Corporation, Spina...

  5. Cinco Exemplos

    ERIC Educational Resources Information Center

    Kalvelage, Joan

    1972-01-01

    Offers a description of 5 Southwestern institutions serving American Indian and Chicano students; Tlatelolco Field Study Center, Casa de la Raza, Farmworkers Community School, Colegio Jacinto Trevino and Deganawidah-Quetzalcoatl University (DQU). (PG)

  6. 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…

  7. [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.

  8. 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…

  9. 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…

  10. 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…

  11. 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…

  12. 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…

  13. 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,…

  14. 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.

  15. 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…

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

    Technology Transfer Automated Retrieval System (TEKTRAN)

    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...

  17. 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,…

  18. La Materia. Nivel II. Basado en el curso de estudios de Ciencia de Montgomery County Public Schools. (Matter. Level II. Based on the Montgomery County Public Schools Science Studies Program).

    ERIC Educational Resources Information Center

    Gerstman, M. Linda

    This curriculum unit is for use in an elementary school foreign language immersion program in Montgomery County, Maryland. The unit is geared toward the second grade science classroom. It includes instructional and performance objectives, vocabulary lists, optional language structure sections, illustrations, activities, evaluation suggestions, and…

  19. Caracteristicas de los Estudiantes de Ciencias Agricolas y de Economia Domestica de la Universidad de Puerto Rico (Characteristics of the Agricultural Science and Home Economics Students of the University of Puerto Rico). Publicacion 135.

    ERIC Educational Resources Information Center

    Lube, Edna Droz; Calero, Reinaldo

    As part of a U.S. Department of Agriculture research project on young adults, a questionnaire was distributed in the fall of 1977 to all agriculture science and home economics students at the University of Puerto Rico in order to determine their personal and parental backgrounds; work, college, and high school experiences; life goals and attitudes…

  20. Seres Vivos. Nivel I. Basado en el curso de estudios de Ciencia de Montgomery County Public Schools. (Living Beings. Level 1. Based on the Montgomery County Public Schools Science Studies Program).

    ERIC Educational Resources Information Center

    Senger, Graciela

    This curriculum unit, developed by the Montgomery County Public Schools, Maryland, was designed for use in the elementary level foreign language immersion program. It is geared toward the first grade science classroom. The unit includes instructional and performance objectives, necessary vocabulary lists, optional language structure sections,…

  1. [The case of the 'lowlife': perceptions of danger and the prevention of disreputable behaviors in theRevista de Criminología, Psiquiatría, Medicina Legal y Ciencias Afinesin Buenos Aires, 1914-1923].

    PubMed

    Dovio, Mariana

    2013-11-30

    We analyze the construction of the notion of the 'lowlife' in the city of Buenos Aires in the Revista de Criminología, Psiquiatría y Medicina Legal, from 1914-1923. We shall analyze the notion of 'lowlife', meaning behaviors situated in a border zone between crime and madness, from the point of view of prevention and perception of danger. The first way of analyzing the 'lowlife' examines institutional projects that were related to eugenics and that advocated preventive detention of dangerous people, 'alcoholists' and vagrants. The second involves identifying in moral and physical terms the kind of people who were targeted in the creation of intervention projects for those considered to be 'lowlifes', who could potentially damage the fabric of society in some way.

  2. Como Promover el Exito de las Ninas y las Minorias en las Ciencias y en las Matematicas. Para Padres/sobre Padres (How To Promote the Science and Mathematics Achievement of Females and Minorities. For Parents/about Parents).

    ERIC Educational Resources Information Center

    Schwartz, Wendy

    Some minority and female students traditionally have not been given the help they need to enroll and succeed in mathematics and science classes. Now, however, various approaches are available to give these students the extra attention they need. Parents can help children develop an interest in science and mathematics by: (1) identifying role…

  3. A Pos-Graduacao Nas Ciencias Humanas e o Paradigma da Medicina: A Era da Especializacao. (Post-Graduation in the Human Sciences and the Paradigm of Medicine: The Era of Specialization.)

    ERIC Educational Resources Information Center

    Costa, Celio Juvenal

    2000-01-01

    Reflects on the current tendency in Brazilian higher education for greater and greater specialization, particularly in human sciences and in medicine. Calls for less specialization and a more historic and general preparation, especially in teacher education. (BT)

  4. [The case of the 'lowlife': perceptions of danger and the prevention of disreputable behaviors in theRevista de Criminología, Psiquiatría, Medicina Legal y Ciencias Afinesin Buenos Aires, 1914-1923].

    PubMed

    Dovio, Mariana

    2013-11-30

    We analyze the construction of the notion of the 'lowlife' in the city of Buenos Aires in the Revista de Criminología, Psiquiatría y Medicina Legal, from 1914-1923. We shall analyze the notion of 'lowlife', meaning behaviors situated in a border zone between crime and madness, from the point of view of prevention and perception of danger. The first way of analyzing the 'lowlife' examines institutional projects that were related to eugenics and that advocated preventive detention of dangerous people, 'alcoholists' and vagrants. The second involves identifying in moral and physical terms the kind of people who were targeted in the creation of intervention projects for those considered to be 'lowlifes', who could potentially damage the fabric of society in some way. PMID:24346199

  5. 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.

  6. 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.

  7. [Acquired immunodeficiency syndrome-related lymphoma: 1. Course during the 20 years of the epidemic. 2. The experience at the Instituto Nacional de Ciencias Médicas y Nutrición Salvador Zubirán: 1986-2003].

    PubMed

    Hernández-Rivera, E Gabriela; Gómez-Roel, Xóchitl; Villasís-Keever, Angelina

    2004-01-01

    The goal of this presentation is the description of the epidemiologic evolution and changes in natural history of the human immunodeficiency virus infection (HIV) epidemic itself and its relation with the acquired immunodeficiency syndrome-related lymphoma (ARL). We have started with the description of the world's state of the HIV epidemic, its features since the first case report in the United States of America in 1981, through the peak of new diagnoses in 1993 until the event that changed the natural history of the disease: the era of the widespread use of the highly active antiretroviral therapy (HAART), introduced in 1995 in the world and in 1997 in our country. The widespread introduction of HAART led to dramatic reductions in AIDS related mortality and morbidity throughout the developed world with a marked fall in the incidence of the major opportunistic infections in AIDS. We describe the main risk factors for the development of ARL, and the prognostic factors for survival and response to treatment. There is no clear definition in the literature of the roll that has played the use of HAART in relation to survival and response to treatment in ARL, but there is evidence that the basal count of CD4 cells has increased with HAART, leading to a better survival and response in ARL. The debate regarding this issue is surely affected by factors such as degree of antiretroviral treatment compliance, antiretroviral therapy resistance and chemotherapy heterogeneity. Finally we present the preliminary results of the analysis of our experience in ARL from 1986 to 2003.

  8. 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.

  9. Countercurrents in Iranian Education: Azarbaiyan

    ERIC Educational Resources Information Center

    Bahari, Seifollah

    1976-01-01

    A priority goal of Iran's present Shah, Mohammad Raza Pahlevic, has been to bring all Iran into this century by means of education. The focus here was on Azarbaiyan, a state in the northwest of the country, and its resistance to all forms of change. The influence of religion as the basis for that resistance was discussed. (Author/RK)

  10. Statement on the Immigration and Naturalization Service Implications for Hispanics before the House Subcommittee on Immigration, Refugees, and International Law.

    ERIC Educational Resources Information Center

    Yzaguirre, Raul

    The National Council of La Raza applauds the recent efforts of the Immigration and Naturalization Service (INS) to increase its overall effectiveness by changing its organizational structure, modernizing its information systems, and improving its public image. However, in a number of important areas, the INS still faces grave problems. While…

  11. Comunicado de prensa del Informe Anual sobre el Estado del Cáncer 2015

    Cancer.gov

    Por primera vez, los investigadores han usado datos a nivel nacional para determinar la incidencia de los cuatro subtipos moleculares principales de cáncer de seno (mama) por edad, raza y grupo étnico, nivel de pobreza y varios otros factores. El informe

  12. 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:…

  13. Dual Utilization of Medical Services by Low Income Latino Families: An Exploratory Investigation.

    ERIC Educational Resources Information Center

    Coe, Merilyn

    1985-01-01

    Interviews with 50 low income family members who used two health care providers--Kaiser Health Maintenance Organization and La Clinica de La Raza--were used to study how cost, need, access, services, and culture affected choice of provider. Cultural affinity seemed to influence decisions to use and pay for La Clinica's services. (JHZ)

  14. 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,…

  15. Testimony on the Economic Status of Hispanic Children and Families. Presented before the Select Committee on Children, Youth, and Families, U.S. House of Representatives, September 25, 1989.

    ERIC Educational Resources Information Center

    Quiroz, Julia Teresa

    This document presents testimony delivered before the House Select Committee on Children, Youth, and Families on the economic status of Hispanic children and families in the United States. The speaker, a senior policy analyst at the National Council of La Raza, focuses on the strengths of Hispanic families, the economic challenges they face, and…

  16. On My Own: Mexican American Women, Self-Sufficiency, and the Family Support Act.

    ERIC Educational Resources Information Center

    Quiroz, Julia Teresa; Tosca, Regina

    The Focus Study, conducted by the National Council of La Raza's Poverty Project, used structured discussions by focus groups to examine Mexican American women's opinions, needs, and attitudes as they relate to the implementation of the 1988 Family Support Act (FSA). FSA's primary objective is to move people off welfare through education, training,…

  17. 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,…

  18. Project EXCEL: A National Hispanic Organization Seeks To Improve the American Educational System for Hispanic Children.

    ERIC Educational Resources Information Center

    Orum, Lori; Navarrete, Lisa

    1990-01-01

    The National Council of La Raza launched Project Excellence in Community Educational Leadership (EXCEL), in 1985 to contribute experiences and input from the community level to the school reform process and to address some of the short-term needs of the students currently enrolled. Project EXCEL, which is designed to help Hispanic American…

  19. Chicanas/os and Latinas/os Crossing Institutional Fronteras: Critical Race Counterstories along the College Transfer Pipeline at a Sacramento Valley Community College

    ERIC Educational Resources Information Center

    Ramirez, Richard Andrew

    2011-01-01

    Chicanos and Latinos constitute the fastest-growing ethnic group in the United States, with the California public school system reporting a definitive majority (50.4%) of Raza students in 2010, and California community colleges (CCCs) approaching record one-third Chicano/Latino enrollments in the last five years. Since CCCs are the entry point to…

  20. Language and La Academia, If English Works, Por Que Se Emplea Espanol?

    ERIC Educational Resources Information Center

    Jonz, Jon G.

    1978-01-01

    The dynamics of Mexican American nationalism reflected in the publications of the Academia de la Nueva Raza and in a 1971 work by Ricardo Sanchez are examined in this article. The connection between language and ideology is discussed in the context of Chicano nationalist writing. (GC)

  1. Action Needed To Educate Hispanics, Employers about Implications of New Immigration Legislation.

    ERIC Educational Resources Information Center

    Kamasaki, Charles

    Designed to inform key members of La Raza about practical implications of the Immigration Reform and Control Act of 1986, this bulletin outlines immediate action that should be taken to educate the Hispanic community and employers about the legislation. Brief summaries are provided for four critical provisions of the legislation: (1) a…

  2. Testimony on Implementation of the Immigration Reform and Control Act of 1986 (Public Law 99-603). Presented before the Subcommitee on Immigration and Refugee Policy, Committee on the Judiciary, United States Senate.

    ERIC Educational Resources Information Center

    Kamasaki, Charles

    Hispanics--affected more than any other ethnic group by immigration laws--have a profound interest in the implementation of the Immigration Reform and Control Act of 1986. The National Council of La Raza holds the following views: (1) the proposed regulations implementing the Act are unacceptable; (2) the capacity and resources necessary for…

  3. Issue Update: An Overview of the Immigration Reform Act.

    ERIC Educational Resources Information Center

    Kamasaki, Charles; Briceno, Rose

    An overview of the Immigration Reform and Control Act of 1986 summarizes legislative developments prior to passage of the bill, describes major elements of the legislation, discusses the activities of the National Council of La Raza in monitoring implementation of the law, and emphasizes the necessary role of the network of Hispanic…

  4. Testimony on the Immigration Reform and Control Act of 1985 (S. 1200) before the Subcommittee on Immigration and Refugee Policy, Committee on the Judiciary, United States Senate.

    ERIC Educational Resources Information Center

    Yzaguirre, Raul

    The National Council of La Raza's opposition to the Immigration Reform and Control Act of 1985 (S. 1200) is explained in this paper, which was presented as testimony before the Senate Subcommittee on Immigration and Refugee Policy. Three provisions of the proposed bill are analyzed: employer sanctions, legalization, and guestworkers. First, the…

  5. Developing Critical Consciousness: Resistance Literature in a Chicano Literature Class

    ERIC Educational Resources Information Center

    Acosta, Curtis

    2007-01-01

    Starting from a framework that emphasizes indigenous heritage, high school teacher Curtis Acosta and students in the Chicano/Raza Studies classes engage with literature that reflects the students' lives, families, and histories. Doing so encourages students to visualize and affirm academic identities while they confront current issues of…

  6. 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…

  7. 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)

  8. 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…

  9. 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…

  10. Perspectives on Chicano Education.

    ERIC Educational Resources Information Center

    Gonzales, Tobias, Ed.; Gonzales, Sandra, Ed.

    Written by Stanford University students, the 9 articles in this publication reflect student ideas on Chicano education. Their aim is to stimulate new ideas and discussion on Raza Education. The majority of the articles were written by students in the Department of Education and by students working toward a Ph.D. degree. Divided into 3 parts, the…

  11. Educator-Lawyer Conference Report (Albuquerque, New Mexico, October 17, 1973).

    ERIC Educational Resources Information Center

    Casso, Henry J., Comp.; Esquibel, Antonio, Comp.

    Sponsored by the National Task Force de la Raza, the conference was attended by prominent lawyers and educators from throughout the United States. The conference was an "exploratory" or "brainstorming" session, designed to identify key issues and to lay the groundwork for techniques and strategy of dealing with various problems. Purpose of the…

  12. 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,…

  13. 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

  14. 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

  15. 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.

  16. John McCain

    ERIC Educational Resources Information Center

    Phi Delta Kappan, 2008

    2008-01-01

    This article presents speeches describing John McCain's position on education posted on the McCain campaign's official web site, www.johnmccain.com. These include McCain's speech to LaRaza convention, July 14; McCain's speech to the NAACP, July 16; McCain's speech at the Greater Columbus (Ohio) Convention Center, May 15; and McCain's speech at…

  17. 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. PMID:27101640

  18. 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

  19. Register of Education and Training Activities in Librarianship, Information Science and Archives = Inventaire des activites de formation dans le domaine de la bibliotheconomie, des sciences de l'information et de l'archivistique = Inventario de las actividades de formacion en la esfera de la bibliotecologia, las ciencias de la informacion y la archivologia.

    ERIC Educational Resources Information Center

    de Grolier, Eric, Comp.

    This register provides information on information science, librarianship, documentation, and archival science training activities conducted outside regular university courses organized by specialized schools. Based on a December 1980 UNESCO questionnaire survey, the register includes seminars, refresher courses, continuing education courses, and…

  20. Tabla de Especificaciones e Instructivo sobre Elaboracion de Pruebas Objetivas en la Ensenanza Primaria, para las asignaturas de Estudios Sociales, Idioma Espanol, Matematicas y Ciencias Naturales (Specification Tables and Instructions for the Construction of Objective Tests in the Primary Grades in Social Studies, Spanish, Mathematics, and Natural Sciences).

    ERIC Educational Resources Information Center

    Ministerio de Educacion, Guatemala City (Guatemala). Direccion de Bienestar Estudiantil y Educacion Especial.

    This booklet presents specification tables illustrating the relative importance given to topics on tests within a particular subject area. The general subject areas are social studies, Spanish, mathematics, and natural sciences. Tables are provided for final exams in each of these areas for several primary grades, illustrating the importance of…

  1. Power weighted L p -inequalities for Laguerre-Riesz transforms

    NASA Astrophysics Data System (ADS)

    Harboure, Eleonor; Segovia, Carlos; Torrea, José L.; Viviani, Beatriz

    2008-10-01

    In this paper we give a complete description of the power weighted inequalities, of strong, weak and restricted weak type for the pair of Riesz transforms associated with the Laguerre function system \\{mathcal{L}_k^{α}\\}, for any given α>-1. We achieve these results by a careful estimate of the kernels: near the diagonal we show that they are local Calderón-Zygmund operators while in the complement they are majorized by Hardy type operators and the maximal heat-diffusion operator. We also show that in all the cases our results are sharp.

  2. 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

  3. 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.

  4. Erratum: "Abundances of Planetary Nebulae in the Outer Disk of M31" (2012, ApJ, 753, 12)

    NASA Astrophysics Data System (ADS)

    Kwitter, Karen B.; Lehman, Emma M. M.; Balick, Bruce; Henry, R. B. C.

    2013-05-01

    Not Available Partially based on observations obtained with the Apache Point Observatory 3.5 m telescope, which is owned and operated by the Astrophysical Research Consortium; and 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).

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

    SciTech Connect

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

    2007-03-15

    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 cria en

  6. [To the primeval hospital for children of the Mexican social security system].

    PubMed

    Frenk, Silvestre

    2014-01-01

    The Law that led to the foundation of the Seguro Social was enacted on December 31st 1942, and later it was amended in 1945 to give rise to the Instituto Mexicano del Seguro Social. The first 10 years were characterized by the integration and acceptance of healthcare services from the social security point of view. In the 50s, with the construction of the Hospital La Raza, and in the 60s, with the construction of the Centro Medico Nacional, an expansion took place with the creation of several specialty units. The Hospital de Pediatría from the Centro Médico Nacional was one of them. A brief historical description of its origins is presented, and most importantly, of the impact it had on Mexican medicine.

  7. [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

    INTRODUCCIÓN: los síntomas del trastorno por déficit de atención e hiperactividad pueden persistir hasta la vida adulta en 60 % de quienes la padecieron en la niñez. Nuestro objetivo fue cuantificar los niveles de plomo en la sangre y la orina en niños con diagnóstico de trastorno por déficit de atención e hiperactividad para identificar si existe alguna relación. MÉTODOS: estudio observacional que incluyó a una muestra cautiva del Servicio de Higiene Mental del Hospital General del Centro Médico Nacional La Raza, con diagnóstico de trastorno por déficit de atención e hiperactividad. Se cuantificaron los niveles séricos y urinarios del plomo mediante la técnica de absorción atómica.

  8. [Surgical treatment results of 52 cases of temporomandibular ankylosis].

    PubMed

    Kimura-Fujikami, Takao

    2003-01-01

    We courried out a retrospective study of 52 surgical cases of temporomandibular joint ankylosis, fibrous types I and II in 19 patients (36.4%) and osseous type III-IV in 33 patients (63.6%). Forty two children and teenagers at the Hospital de Pediatria (1983-1985/1989-1998) and Hospital General La Raza (1985-1989) were included also, 10 adults including those operated on at the Hospital de Especialidades, CMN Siglo XXI (IMSS) from 1998 to 2001 were included. We used Dunn modified method en 37 cases (67%) and 17 patients were with Risdon operated on technique (33%). Etiology of ankylosis were direct trauma to jaw, which affected temporomandibular joint mainly in children, while in adults causes were more varied and included as osteomyelitis, middle ear infection, sequels of hemifacial microsomy, and trauma results were considered as good upon obtaining mouth opening of 35 mm without neo-ankylosis during 1-year postoperative control.

  9. Critical pedagogy and its application to health education: a critical appraisal of the Casa en Casa model.

    PubMed

    Merideth, E

    1994-01-01

    Casa en Casa is a popular education project of the community health education section of La Clínica de la Raza, a community-based health clinic in Oakland, California. The author examines the Casa en Casa model for its contributions to furthering health education practitioners' understanding of critical pedagogy and community organizing and their relationship to health education. A description of the project's achievements and the obstacles faced in reaching its goals of community empowerment is followed by an analysis of the weaknesses in the project that may undermine its effectiveness. Recommendations are made as to the importance of linking theory to practice and practice to a long-term vision of social change.

  10. 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.

  11. [Stroke in paediatric patients with sickle-cell anaemia].

    PubMed

    Díaz-Díaz, Judit; Camacho-Salas, Ana; Núñez-Enamorado, Noemí; Carro-Rodríguez, Miguel A; Sánchez-Galán, Victoria; Martínez de Aragón, Ana; Simón-De Las Heras, Rogelio

    2014-08-16

    Introduccion. La anemia falciforme es la forma homocigota, grave, de drepanocitosis, un trastorno genetico, frecuente en raza negra, caracterizado por la produccion de hemoglobina S, anemia hemolitica cronica e isquemia tisular por alteracion del flujo sanguineo. Una cuarta parte de los pacientes presenta manifestaciones neurologicas; el 8-10% de los niños sufrira un ictus. Objetivo. Analizar los casos de ictus en niños con anemia falciforme en nuestro centro. Pacientes y metodos. Estudio descriptivo retrospectivo de niños con anemia falciforme e ictus. Resultados. Se recogieron cinco pacientes (dos dominicanos y tres guineanos) con anemia falciforme e ictus; un paciente sufrio dos episodios ictales. La edad media fue de 27 meses. Cinco episodios fueron infartos isquemicos. El ictus fue la forma de inicio de la drepanocitosis en tres ocasiones. Dos de los ictus ocurrieron en un contexto de meningitis neumococica. En cuatro pacientes hubo fiebre previa. La clinica inicial fue hemiparesia en cuatro casos. La hemoglobina media al diagnostico de ictus fue de 6,5 g/dL. En tres pacientes se hallaron alteraciones en la ecografia transcraneal y, en todos los pacientes, lesiones en la resonancia magnetica, que en la mitad eran bilaterales. Tras el ictus se inicio un protocolo de regimen hipertransfusional, y solo un paciente presento un nuevo ictus, que desarrollo un sindrome moya-moya y fue sometido a una revascularizacion indirecta, con buena evolucion, sin presentar nuevos eventos isquemicos posteriores. Conclusiones. La drepanocitosis es una enfermedad emergente en nuestro medio debido a la inmigracion. Debe sospecharse en ictus pediatricos asociados a anemia, sobre todo en menores de 5 años de raza negra no sometidos a cribado neonatal.

  12. Base Lunar Alpha

    NASA Video Gallery

    Tu misión: Recuperar los sistemas críticos cuando un meteoro daña los equipos de supervivencia de tu ambiente lunar. Parece una película de ciencia ficción, ¿verdad? En realidad, es el nuevo juego ...

  13. 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.

  14. 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…

  15. 77 FR 75663 - Notice Pursuant to the National Cooperative Research and Production Act of 1993-Telemanagement Forum

    Federal Register 2010, 2011, 2012, 2013, 2014

    2012-12-21

    ... Register pursuant to Section 6(b) of the Act on December 8, 1988 (53 FR 49615). The last notification was... Section 6(b) of the Act on November 18, 2011 (76 FR 71602). Patricia A. Brink, Director of Civil... Centro de Ciencias Tecnologicas--CCT, Joinville-SC, BRAZIL; Axia NetMedia Corporation, Calgary,...

  16. 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…

  17. 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).…

  18. 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…

  19. 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.

  20. 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 exploratory learning…

  1. 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…

  2. 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…

  3. 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.

  4. Keeping Kids Still during Exams

    MedlinePlus

    ... el paciente se mantenga completamente inmóvil durante el proceso de formación de imágenes. Cualquier movimiento puede hacer ... para usted. ◆ Esta página educacional del paciente provée información general en cuanto a la ciencia radiológica. ASRT ...

  5. Thickness of the electron atmosphere in large nuclear systems

    NASA Astrophysics Data System (ADS)

    Pacheco, A. F.; Sañudo, J.

    1986-03-01

    Using the relativistic Thomas-Fermi model and the virial theorem it is found that the thickness of the electron skin outside a large nuclear system is given by S⋍6.73 n-1/3, n being the electron density inside the nucleus. On leave from Departamento de Fisica Teorica, Facultad de Ciencias, Universidad de Zaragoza, 50009 Zaragoza, Spain.

  6. 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 Program with…

  7. Fabrication of Optical Fiber Devices

    NASA Astrophysics Data System (ADS)

    Andres, Miguel V.

    In this paper we present the main research activities of the Laboratorio de Fibras Opticas del Instituto de Ciencia de los Materiales de la Universidad de Valencia. We show some of the main results obtained for devices based on tapered fibers, fiber Bragg gratings, acousto-optic effects and photonic crystal fibers.

  8. Estudio de Salud Agrícola

    Cancer.gov

    En 1993, científicos del Instituto Nacional del Cáncer, Instituto Nacional de Ciencias Ambientales y la Agencia de Protección Ambiental de Estados Unidos iniciaron un estudio conocido como Estudio de Salud Agrícola (AHS).

  9. Libraries in U.S. Territories: MedlinePlus

    MedlinePlus

    ... http://www.psm.edu Universidad Central del Caribe Biblioteca Arturo L. Carrión Pacheco Avenida Laurel Santa Juanita ... y Tecnología UPR RP Fac. Cs. Nat. Antes: Biblioteca de Ciencias Naturales OCLC ID PRCDI P.O. ...

  10. 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.

  11. 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.

  12. [h Index and scientific output of researchers in medicine from the University of Guadalajara, Mexico].

    PubMed

    Panduro, Arturo; Ojeda-Granados, Claudia; Rivera, Horacio; Roman, Sonia

    2015-01-01

    Objetivo: evaluar mediante el índice h la productividad científica de investigadores de la Universidad de Guadalajara (UDG) que pertenecen al Sistema Nacional de Investigadores (SNI), en el área de Medicina y Ciencias de la Salud. Métodos: investigadores de la UDG fueron seleccionados del archivo Investigadores Vigentes 2013 del sitio web del SNI. La productividad científica de aquellos registrados en el área de Medicina y Ciencias de la Salud y en Biología y Química se evaluó con el índice h calculado por la base de datos Scopus. Del mismo archivo se seleccionó una muestra de investigadores Eméritos y de aquellos laborando en instituciones capitalinas para realizar el mismo procedimiento y comparar resultados. Resultados: en el SNI, 711 investigadores pertenecieron a la UDG, de los cuales 67.2 % fueron SNI nivel I, y en menor proporción nivel II y III. Solo 24.2 % de ellos, se clasificaron en las áreas de Medicina y Ciencias de la Salud y Biología y Química. El índice h promedio de investigadores nivel I, II y III en Medicina y Ciencias de la Salud fue 5.4, 10.5 y 14.5, respectivamente. Los investigadores capitalinos y Eméritos tuvieron un índice h promedio de 23.4 y 19.8 respectivamente. Conclusión: el índice h permite medir cuantitativa y cualitativamente la productividad científica de los investigadores, evitando sesgo en procesos de evaluación. Se propone su uso en futuras evaluaciones de los miembros del SNI y para médicos que se inscriban a la Academia Nacional de Medicina.

  13. 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.

  14. 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

  15. Projected BCS-Tamm-Dancoff approximation with blocking effect

    NASA Astrophysics Data System (ADS)

    Dias, H.; Krmpotić, F.

    1982-05-01

    The blocking effect is introduced through a canonical transformation in the projected BCS-Tamm-Dancoff approximation. It is suggested that the blocking effect may play an important role in the description of the low-lying states in odd-mass nuclei. Present address: Departamento de Física, Facultad de Ciencias Exactas, Universidad Nacional de La Plata, 1900 La Plata, Argentina. Member of Carrera de Investigador Científico, CONICET, Argentina. Sponsored by Financiadora de Estudos e Projetos (FINEP), Brasil.

  16. [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. PMID:27595244

  17. [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.

  18. [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.

  19. 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.

  20. 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

  1. Microsatellite markers isolated in olive ( Olea europaea L.) are suitable for individual fingerprinting and reveal polymorphism within ancient cultivars.

    PubMed

    Cipriani, G.; Marrazzo, M. T.; Marconi, R.; Cimato, A.; Testolin, R.

    2002-02-01

    We have isolated and sequenced 52 microsatellites or simple sequence repeats (SSRs) from nearly 60 positive clones obtained from two 'Frantoio' olive genomic libraries enriched in (AC/GT) and (AG/CT) repeats, respectively. The repeat-containing fragments obtained from genomic DNA restricted with Tsp509I were separated using a biotinylated probe bound to streptavidin-coated paramagnetic beads. Fragments were then cloned into lambda ZAPII vector and sequenced. Thirty of the 36 primer pairs which gave correct re-amplification in the source genome were used to assay the polymorphism of 12 olive cultivars, namely four well-known cultivars ('Coratina', 'Frantoio', 'Leccino', 'Pendolino') and eight ancient cultivars grown locally near Lake Garda ('Casaliva', 'Favarol', 'Fort', 'Grignan', 'Less', 'Raza', 'Rossanel', 'Trep'). The local cultivars were each re- presented by two to four long-lived individuals. The analysis was carried out using (33)P-labelled primers and 6% polyacrylamide sequencing gels. All except two microsatellites showed polymorphism, the number of alleles varying from 1 to 5. The average genetic diversity ( H) was 0.55. The power of discrimination ( PD) was 0.60. All cultivars, including the local ones, were easily separated from each other. Variations in the SSR pattern were observed among individual plants of the same cultivar in four out of the eight local cultivars analysed. Several primer pairs (17%) amplified more than one locus.

  2. Silvopastoralism and autochthonous equine livestock: analysis of the infection by endoparasites.

    PubMed

    Francisco, I; Arias, M; Cortiñas, F J; Francisco, R; Mochales, E; Sánchez, J A; Uriarte, J; Suárez, J L; Morrondo, P; Sánchez-Andrade, R; Díez-Baños, P; Paz-Silva, A

    2009-10-14

    Two groups of autochthonous Pura Raza Galega (PRG) horses, one comprising 483 animals under a silvopasturing regime, and the other comprising 72 PRG horses managed in farms, were used to analyse the effect of silvopasture on infection by endoparasites. Results were considered according to the age and the sex of the horses. Faecal samples were individually collected from each animal and analysed by the coprological flotation, sedimentation and migration techniques. Coprocultures were also done to identify the main strongylid genera affecting the horses. Eggs from the gastrointestinal nematoda Parascaris equorum, strongyles and Oxyuris equi were the only endoparasites observed in the faeces of the horses. Larvae of Trichonema and Cyalocephalus spp. (small strongyles) and Strongylus and Triodontophorus (large strongyles) were identified in the coprocultures. The silvopasturing horses had the highest prevalence of the helminth parasites. The percentage of horses passing ascarid eggs was significantly higher in pasturing horses younger than 3 years. The prevalence of strongyles was statistically greater in the oldest grazing equines. Mares reached the highest prevalence of helminth egg output. Our results showed that native horses kept under silvopasture had the highest prevalence of the ascarids, strongyles and oxyurids, possibly due to their exposure to contaminated grazing areas, lack of appropriate feeding and control of their health status. We conclude that silvopasture increases the presence of infection by gastrointestinal nematoda in wild horses, especially by strongyles. Suitable measures to control parasitic diseases affecting horses in silvopasture should be considered in those systems. PMID:19632049

  3. [Clinical practice guideline. Traumatic urethral stenosis in males].

    PubMed

    Serrano-Brambila, Eduardo Alonso; Moreno-Alcázar, Othón Martino; Neri-Páez, Edgar; Sánchez-Martínez, Luis Carlos; Hernández-Ordóñez, Octavio Francisco; Morales-Morales, Arturo; Basavilvazo-Rodríguez, M Antonia; Torres-Arreola, Laura del Pilar; Valenzuela-Flores, Adriana Abigail; Hernández-Valencia, Marcelino

    2013-01-01

    The incidence of urethral stenosis in Mexico had not been documented. At the Centro Médico Nacional La Raza, during the year 2010, 629 patients with urethral stenosis were attended as outpatient consultation: 85 % with previous urethral stenosis and 15 % with urethral treatment complication. Urethral stenosis is a chronic illness, with multiple etiological origins and the handling is controversial. It has a great negative impact for the patients and the recurrence reaches 85 %. The treatment consisted of an invasive approach (urethral dilations, endoscopy procedure) and open surgery (urethroplasty). The World Health Organization and World Alliance take the world challenge about the urinary tract infections associated with the attention of patients, focused on urethral stenosis. The objective of the following clinical guide is to offer to the health professional a clinical tool for making decisions in the handling of the hardship or masculine urethral stenosis, based on the best available evidence, carrying out in systematized form with bibliographical research using validated terms of the MeSH: urethral structures, in the databases Trip database, PubMed, Guideline Clearinghouse, Cochrane Library and Ovid.

  4. [Anthropometric measures in urban child population from 6 to 12 years from the northwest of México].

    PubMed

    Brito-Zurita, Olga Rosa; López-Leal, Josefa; Exiga-González, Emma Beatriz; Armenta-Llanes, Oscar; Jorge-Plascencia, Blanca; Domínguez-Banda, Alberto; López-Morales, Mónica; Ornelas-Aguirre, José Manuel; Sabag-Ruiz, Enrique

    2014-01-01

    INTRODUCCIÓN: el grado de sobrepeso-obesidad tendrá variaciones de acuerdo con las condiciones de cada población, según el ámbito geográfico, la raza o etnia, el status socioeconómico y la susceptibilidad de cada individuo. El objetivo de este estudio fue determinar medidas antropométricas en la población infantil urbana de 6 a 12 años de Ciudad Obregón, Sonora. MÉTODOS: se estudiaron 684 escolares de 6 a 12 años de edad, sanos y de ambos géneros de la zona urbana de Ciudad Obregón, Sonora, en quienes se midieron peso, talla, perímetro braquial (PB), cintura e índice de masa corporal (IMC). Se realizó estadística descriptiva mediante frecuencias, porcentajes, e inferencial mediante t de Student para comparar las tablas de crecimiento de Ramos Galván y las del Centro para el Control y Prevención de Enfermedades (CDC).

  5. [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. PMID:8373546

  6. [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.

  7. [Occlusion of patent ductus arteriosus with a Gianturco-Grifka device. First case at the Instituo Mexicano del Seguro Social (IMSS)].

    PubMed

    Munayer Calderón, J; Aldana Pérez, T; San Luis Miranda, R; Maza Juárez, G; Lázaro Castillo, J L; Ramírez Reyes, H; Quintero, L R; Arias Monroy, L; Campos Gómez, A

    2000-01-01

    We present the initial experience of closing of patent ductus arteriosus (PDA) with a new device; Gianturco-Grifka, at the General Hospital of The Medical Center "La Raza". The patient was a 4 year's old girl, in whom we detected continuous murmur in the second intercostal space, echocardiography showed a long conical patent ductus arteriosus 4.9 mm of diameter, systolic pressure of the pulmonary artery was 35 mm Hg with QP/QS 1.6:1. Hemodynamic study revealed a long conical ductus arteriosus 5 mm of diameter, type A1 from Krichenko classification. We proceeded to occlude the PDA with a Gianturco-Grifka device of 7 mm. Immediately after the PDA occlusion the shunt disappeared, there were no complications during the procedure. More cases are needed to determine long term benefits and limitations, of this procedure. However we conclude that technically it is easy to use. There is greater decrease of residual shunt that the one reported with other devices.

  8. Sex reversal syndrome in the horse: four new cases of feminization in individuals carrying a 64,XY SRY negative chromosomal complement.

    PubMed

    Anaya, Gabriel; Moreno-Millán, Miguel; Bugno-Poniewierska, Monika; Pawlina, Klaudia; Membrillo, Alberto; Molina, Antonio; Demyda-Peyrás, Sebastián

    2014-12-10

    Horses are characterized as having a greater rate of chromosomal abnormalities than other species, which are mainly related to the sex chromosome pair and produce a series of different anomalies known as disorders in sexual development (DSD). In the present study, three Pura Raza Española (PRE) and one Menorquín (MEN) horses were studied and an incompatibility in their genetic and phenotypic sex were detected. Animals were karyotyped by conventional and molecular cytogenetic analyses and characterized using genomic techniques. Although all individuals, were totally unrelated, these animals had the same abnormality (64,XY SRY negative DSD) despite having an anatomically normal external mare phenotype. Therefore, this syndrome could remain undiagnosed in a large percentage of cases because the physiological and morphological symptoms are rare. In the present study, a slight gonadal dysgenesis was observed only in older individuals. Interestingly this chromosomal abnormality has been previously reported less than twenty times, and never in the PRE or MEN horses. With the present research, it is demonstrated that the use of genetic and cytogenetic diagnostic tools in veterinary practice could be an important complementary test to determine the origin of unexplained reproductive failures among horses.

  9. 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

  10. Ability of the fungus Duddingtonia flagrans to adapt to the cyathostomin egg-output by spreading chlamydospores.

    PubMed

    Paz-Silva, A; Francisco, I; Valero-Coss, R O; Cortiñas, F J; Sánchez, J A; Francisco, R; Arias, M; Suárez, J L; López-Arellano, M E; Sánchez-Andrade, R; de Gives, P Mendoza

    2011-06-30

    The analysis of the capability of the nematode trapping-fungus Duddingtonia flagrans to adapt to the cyathostomin egg-output in horses was evaluated. Fecal samples from 196 pasturing autochthonous Pura Raza Galega horses were collected from the rectum and then divided according to the egg-output into three groups: ≤ 300, 310-800 and >800 eggs per gram feces. Four doses of chlamydospores (0.1, 0.2, 0.4 and 0.8 × 10(6)/100g feces) were directly spread onto fecal pats on the ground, remaining one without treatment as control. Fecal pats confirmed the presence of gastrointestinal nematode larvae belonging to strongylid cyathostomins (Cyathostomum and Gyalocephalus spp). An overall 94% (95% CI 91, 97) percentage of reduction was obtained, and an increase in the activity of the trapping-fungi simultaneously to the rising in the number of cyathostomin eggs and larvae in the coprocultures was detected. A significantly highest reduction of the cyathostomin L3 in the coprocultures with more than 800 EPG was found, which indicates that Df trapping activity is larvae nematode density-dependant. The present research showed the high biological activity of D. flagrans against nematode larvae can adjust to the cyathostomin egg-output, and underlines its efficacy as a practical method for the control of these parasites in grazing horses.

  11. [Clinical practice guideline. Traumatic urethral stenosis in males].

    PubMed

    Serrano-Brambila, Eduardo Alonso; Moreno-Alcázar, Othón Martino; Neri-Páez, Edgar; Sánchez-Martínez, Luis Carlos; Hernández-Ordóñez, Octavio Francisco; Morales-Morales, Arturo; Basavilvazo-Rodríguez, M Antonia; Torres-Arreola, Laura del Pilar; Valenzuela-Flores, Adriana Abigail; Hernández-Valencia, Marcelino

    2013-01-01

    The incidence of urethral stenosis in Mexico had not been documented. At the Centro Médico Nacional La Raza, during the year 2010, 629 patients with urethral stenosis were attended as outpatient consultation: 85 % with previous urethral stenosis and 15 % with urethral treatment complication. Urethral stenosis is a chronic illness, with multiple etiological origins and the handling is controversial. It has a great negative impact for the patients and the recurrence reaches 85 %. The treatment consisted of an invasive approach (urethral dilations, endoscopy procedure) and open surgery (urethroplasty). The World Health Organization and World Alliance take the world challenge about the urinary tract infections associated with the attention of patients, focused on urethral stenosis. The objective of the following clinical guide is to offer to the health professional a clinical tool for making decisions in the handling of the hardship or masculine urethral stenosis, based on the best available evidence, carrying out in systematized form with bibliographical research using validated terms of the MeSH: urethral structures, in the databases Trip database, PubMed, Guideline Clearinghouse, Cochrane Library and Ovid. PMID:24021082

  12. 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

  13. Automated peritoneal dialysis as the modality of choice: a single-center, 3-year experience with 458 children in Mexico.

    PubMed

    Fabian Velasco, Rosaura; Lagunas Muñoz, Jesus; Sanchez Saavedra, Veronica; Mena Brito Trejo, Jorge E; Qureshi, Abdul Rashid; García-López, Elvia; Divino Filho, Jose C

    2008-03-01

    Automated peritoneal dialysis (APD) has been considered as the ideal dialysis modality for pediatric patients. This study reports the 3-year APD experience with 458 end-stage renal disease (ESRD) children who started APD in a single pediatric center in Mexico City between June 2003 and June 2006. By June 2003, there were 310 patients being treated with continuous ambulatory peritoneal dialysis (CAPD). At that time, these patients were gradually switched to APD, with priority being given to those prescribed more than four exchanges per day, younger than 6 years of age, or presenting complications [hernias or decreased ultrafiltration (UF)]. An improvement of daily UF was observed when the patients were switched from CAPD (590 +/- 340 ml/day) to APD (846 +/- 335 ml/day). The presence of edema decreased (from 67% to 8%) as well as the percentage of patients requiring antihypertensive drugs (from 83% to 38%), the peritonitis rate improved from one episode every 35 patient/month to one episode every 47 patient/month, the total number of hospitalizations decreased (from 384 to 51), and 85% of children attended school. While waiting for renal transplant, APD is the dialysis modality of choice for ESRD children at the La Raza Medical Center in Mexico City.

  14. "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. PMID:25733067

  15. 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.

  16. [Characterization of Cryptococcus neoformans strains isolated from patients with acquired immunodeficiency syndrome (AIDS)].

    PubMed

    Garza-Garza, D; Buendía-Uribe, J L; Martínez-Cruz, E; Argüero-Licea, B

    1995-01-01

    In Mexico cryptococosis ranks third in frequency among the mycoses ocurring as complications in AIDS patients. Neither the prevalence of the two varieties of C. neoformans in these patients nor the morphological and physiological changes suffered by these strains in AIDS patients are known. A total of 60 isolates were obtained from patients with AIDS from the Hospital de Infectología, Centro Médico "La Raza" IMSS. The identity of each isolate was established by: growth at 37 degrees C, colony and microscopic characteristics, urease and phenoloxidase activity, carbon sources assimilation. The canavanine glycine-bromothymol blue agar was used to distinguish C. neoformans var. neoformans and C. neoformans var. gattii. Pathogenicity in mice was also tested. Fifty one isolates of C. neoformans var. neoformans and nine of C. neoformans var. gattii were identified. All strains grew well at 37 degrees C, urease and phenoloxidase were positive, the morphology and the auxanographic profile were variable. C. neoformans var. neoformans was more virulent in mouse than C. neoformans var. gattii. This study has confirmed the presence of the two varieties of C. neoformans in Mexico with 85% prevalence of var. neoformans and 15% of var. gattii in AIDS patients. This frequency was higher than in reports from other countries.

  17. [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.

  18. "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.

  19. [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

    2016-01-01

    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. PMID:27513512

  20. 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.

  1. An inventory of the endogenous and exogenous sources of fixed nitrogen for the early Earth and Mars

    NASA Astrophysics Data System (ADS)

    Navarro-Gonzalez, R.; Segura, A.; Nna Mvondo, D.; McKay, C.; Coll, P.; Raulin, F.

    1.Laboratorio de Química de P asmas y Estudios Planetarios, Instituto delCiencias Nucleares, Universidad Nacional Autónoma de México, CircuitoExterior, C.U., Apartado Postal 70-543, México D.F. 04510, MEXICO2.Laboratoire Interuniversitaire des Systèmes Atmosphériques, UniversitésParis 12 &Paris 7, 61 Avenue du Général de Gaulle, F 94010 CréteilCedex, France3.Space Science Division, Mail Stop 245-3, Moffett Field, CA 94035, USA

  2. 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.

  3. 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

  4. 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.

  5. 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.

  6. 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.

  7. On the width of Σ hypernuclei and Σ- atoms

    NASA Astrophysics Data System (ADS)

    Brockmann, R.; Oset, E.

    1982-12-01

    The self-energy of a Σ particle in symmetric nuclear matter is investigated by using a boson exchange model for the ΣN interaction. The imaginary part of the self-energy is shown to be strongly density dependent and has saturation properties around ϱ ≌ 0.7 ϱo. This peculiar feature allows our results to be in good agreement with the Σ atom data while simultaneously providing a width of about 5 Mev or smaller for all nuclei and different states. Permanent address: Departamento de Física Atómica y Nuclear, Facultad de Ciencias, Universidad de Salamanca, Salamanca, Spain.

  8. [Hypophysitis autoimmune. Case series and literature review].

    PubMed

    Pérez, Guadalupe; Almeda-Valdés, Paloma; Cuevas-Ramos, Daniel; Juárez-Comboni, Sonia Citlali; Higuera-Calleja, Jesús; Gómez-Pérez, Francisco Javier

    2013-01-01

    Autoimmune hypophysitis is a rare condition that must be considered in the differential diagnosis of any pituitary tumor. We present a series of nine patients with clinical and radiologic diagnosis of autoimmune hypophysitis that were admitted to the Instituto Nacional de Ciencias Médicas y Nutrición Salvador Zubirán (INCMNSZ) in Mexico City between 2000-2012. Clinical, biochemical, imaging features (on MRI), treatment, and follow-up are described, and a review on this disease is presented.

  9. Collision between variably polarized plane gravitational wave and a shell of null matter

    NASA Astrophysics Data System (ADS)

    Feinstein, Alexander; Senovilla, Josém. M.

    1989-06-01

    We construct a solution to the Einstein field equations which describes the collision between a variably polarized gravitational wave and a shell of null dust. Depending on the choice of the parameters the variably polarized wave can have an arbitrarily smooth wavefront. The shell of null dust is followed by a constantly polarized plane gravitational wave. Also Grupo de Física Teórica, Departamento de Física, Ingeniería y Radiología Médica, Facultad de Ciencias, Universidad de Salamanca, 37008 Salamanca, Spain.

  10. [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.

  11. [Echinoderms (Echinodermata) from the Gulf of California, Mexico].

    PubMed

    Solís-Marín, Francisco A; Laguarda-Figueras, Alfredo; Durán-González, Alicia; Ahearn, Cynthia Gust; Torres Vega, Juan

    2005-12-01

    A systematic list of the echinoderms of the Gulf of California, based on museum specimens of the Colección Nacional de Equinodermos, Instituto de Ciencias del Mar y Limnologia, Universidad Nacional Autónoma de México and the National Museum of Natural History, Smithsonian Institution, Washington, D.C. is presented. A total of 193 echinoderm species is recorded, distributed in 108 genera, 51 families and 19 orders. 12 new records for the Gulf of California are presented: Asteroidea (four), Ophiuroidea (three) and Holothuroidea (five).

  12. [Echinoderms (Echinodermata) from the Mexican waters of the Gulf of Mexico].

    PubMed

    Durán-González, Alicia; Laguarda-Figueras, Alfredo; Solís-Marin, Francisco A; Buitrón Sánchez, Blanca Estela; Ahearn, Cynthia Gust; Torres-Vega, Juan

    2005-12-01

    We present a systematic list of the echinoderms from Gulf of Mexico's Mexican waters based on specimens of the Colecci6n Nacional de Equinodermos, Instituto de Ciencias del Mar y Limnologia, Universidad Nacional Aut6noma de México and the National Museum of Natural History, Smithsonian Institution, Washington, D.C. This list reveals an important echinoderm biodiversity present in the Gulf of Mexico, where five of the six echinoderm classes are represented. A total of 209 echinoderm species is recorded, distributed in 129 genera, 63 families and 25 orders. 31 new records for the Gulf of Mexico are presented: Asteroidea (16), Ophiuroidea (nine), Echinoidea (one) and Holothuroidea (five).

  13. Inflationary phase in Brans-Dicke cosmology with a cosmological constant

    NASA Astrophysics Data System (ADS)

    Berman, Marcelo Samuel

    1989-12-01

    It has been shown earlier that, for a perfect fluid, a perfect gas law of state, and the Robertson-Walker metric, an exponential phase in Brans-Dicke cosmology is possible, with both positive pressure and density, but not with the violated energy condition p = -ρ. We demonstrate in this paper that the inclusion of a cosmological constant into the theory does not change that picture. Permanent address: Departamento de Ciencias Exatas da Faculdade de Filosofia, Ceincias e Letras da FURJ, Joinville, SC 89200, Brazil.

  14. 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

  15. 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.

  16. 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.

  17. 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.

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

    SciTech Connect

    Pereira, R.; Silva, N.; Quintal, C.; Abreu, R.; Andrade, J.; Dantas, L.

    2007-03-15

    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)

  19. Genomic Characterization of the Genus Nairovirus (Family Bunyaviridae)

    PubMed Central

    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

    2016-01-01

    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. PMID:27294949

  20. [Isotretinoin and depressive symptoms in patiens with severe and recurrent acne].

    PubMed

    Rubio-García, Leticia; Pulido-Díaz, Nancy; Jímenez-López, José Luis

    2015-01-01

    Introducción: a partir del uso de isotretinoína para el manejo del acné, se han publicado resultados controversiales en torno a una probable asociación entre esta y depresión. El objetivo de este estudio fue conocer si el uso de isotretinoína en pacientes con acné severo y recurrente (ASR) se asocia a depresión.Métodos: se incluyeron 22 pacientes con diagnóstico de ASR pertenecientes a la clínica de acné del Centro Médico Nacional La Raza. Se les aplicó el inventario de depresión de Beck (IDB-II) antes, durante (2 meses) y después del tratamiento con isotretinoína (4 meses), calculada a 0.5 mg/kg.Resultados: en las primeras mediciones se reportaron puntuaciones bajas de síntomas depresivos que disminuyeron aún más al final del tratamiento (mediana = 6.5 antes del tratamiento, 3 a los dos meses y 0 al final, con una p < 0.001).Conclusiones: el tratamiento con isotretinoína en esta muestra de pacientes con acné severo y recurrente no produjo aumento de síntomas depresivos, por el contrario los redujo de manera indirecta al mejorar su imagen corporal.

  1. [Prevalence and implicated risk factors associated with the exteriorization of cardiac pacemakers: 5 year follow-up].

    PubMed

    Argüello-Hurtado, Marco; Guevara-Valdivia, Milton Ernesto; Aranda-Ayala, Zulema Lisbeth; Hernández-Lara, Javier

    2015-01-01

    Introducción: el objetivo de este estudio es establecer la prevalencia y determinar la frecuencia de factores de riesgo de exteriorización de marcapasos definitivos (MPD), en el departamento de Electrofisiología Cardiaca de la UMAE Hospital de Especialidades "Dr. Antonio Fraga Mouret" del Centro Médico Nacional La Raza del Instituto Mexicano del Seguro Social.Métodos: se llevó a cabo un estudio transversal, descriptivo del periodo: septiembre del 2005 a septiembre del 2010, para el análisis de los factores se manejó como casos y controles; se eligieron emparejándose por edad, sexo y presencia, o no, de factores de riesgo. Se realizó el cálculo de medidas de tendencia central (media, mediana y moda), así como pruebas de chi cuadrada, test de Fisher y razón de momios.Resultados: se implantaron 3192 MPD, identificando 83 casos de exteriorizaciones, seleccionando 43 casos para casos y controles, la edad promedio fue de 71 años. Ninguno de los factores de riesgo ni el tipo de técnica quirúrgica presentó significancia estadística.Conclusiones: nuestra prevalencia de exteriorizaciones es del 2.6 %, valores muy similares a los reportes publicados. Ninguno de los factores de riesgo descritos se encuentra presente como causa de exteriorización en nuestra población. El análisis de la técnica quirúrgica utilizada puede ser un factor importante, por lo que se necesitan estudios posteriores.

  2. [Orofacial clinical manifestations in adult patients with variable common immunodeficiency].

    PubMed

    Chávez-García, Aurora Alejandra; Moreno-Alba, Miguel Ángel; Elizalde-Monroy, Martín; Segura-Méndez, Nora Hilda; Romero-Flores, Jovita; Cambray-Gutiérrez, Julio César; López-Pérez, Patricia; Del Rivero-Hernández, Leonel Gerardo

    2015-01-01

    Antecedentes: la inmunodeficiencia común variable es la inmunodeficienci primaria más común en adultos. Su prevalencia se estima en 1 por cada 25,000 a 75,000 recién nacidos vivos; existen variaciones por grupos étnicos, se estima en 50 a 70% en pacientes de raza caucásica. Las lesiones de la cavidad oral raramente se describen en pacientes adultos con inmunodeficiencia común variable, en niños con esta enfermedad existen informes de lesiones principalmente de origen infeccioso. Objetivo: describir las lesiones orofaciales (cavidad oral, macizo facial y cuello) en pacientes adultos con inmunodeficiencia común variable. Material y método: estudio transversal, prospectivo, efectuado en todos los adultos con inmunodeficiencia común variable adscritos a la Clínica de inmunodeficiencias primarias, del Hospital de Especialidades, Centro Médico Nacional Siglo XXI, que fueron examinados por un cirujano maxilofacial; se realizó el reporte de hallazgos en lista de cotejo y, posteriormente, el análisis descriptivo de las lesiones. Resultados: se incluyeron 26 pacientes, 16 mujeres y 10 hombres, con edad promedio de 38.6 años. En 18 de 26 pacientes estudiados se observaron lesiones orales, con siete lesiones diferentes y predominio en el sexo femenino 2:1. Las lesiones más frecuentes fueron: hiperplasia de glándulas salivales menores (19/26), petequias (12/26) y úlceras herpetiformes (7/26). En la cara y el cuello se observaron cuatro lesiones distintas, las adenopatías < 2 cm (4/26) fueron las más comunes. Conclusiones: las alteraciones inmunológicas asociadas con la inmunodeficiencia común variable favorecen la aparición de lesiones de origen infeccioso y probablemente autoinmunitario que afectan la cavidad oral, la cara y el cuello.

  3. 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

    2016-01-01

    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. PMID:27294949

  4. An anthropometric classification of body contour deformities after massive weight loss.

    PubMed

    Iglesias, Martin; Butron, Patricia; Abarca, Leonardo; Perez-Monzo, Mario F; de Rienzo-Madero, Beatriz

    2010-08-01

    Deformities caused by massive weight loss were originally subsidized at the Instituto Nacional de Ciencias Médicas y Nutrición "Salvador Zubirán." This caused great economical losses, which led to the development of a classification to select patients with functional problems secondary to massive weight loss. The parameter used is the size of the pannus in relation to fixed anatomic structures within the following anatomic regions: abdomen, arms, thighs, mammary glands, lateral thoracic area, back, lumbar region, gluteal region, sacrum, and mons pubis. Grade 3 deformities are candidates for body contouring surgery because they constitute a functional problem. Grade 2 deformities reevaluated whether the patient has comorbidities. Lesser grades are considered aesthetic procedures and are not candidates for surgical rehabilitation at the Instituto Nacional de Ciencias Médicas y Nutrición "Salvador Zubirán." This classification allowed an improvement in communication between the different surgical-medical specialties; therefore, we suggest its application not only for surgical-administrative reasons but also for academic purposes.

  5. [Quality of life and its determinants in Spanish university students of health sciences factors].

    PubMed

    Wanden-Berghe, Carmina; Martín-Rodero, Helena; Rodríguez-Martín, Amelia; Novalbos-Ruiz, Jose Pedro; Martínez de Victoria, Emilio; Sanz-Valero, Javier; García González, Ángela; Vila, Anna; Alonso, Maria Victoria; Tur Marí, Josep Antoni; Marquez, Sara; García Luna, Pedro Pablo; Irles, José Antonio

    2014-11-30

    Introducción: La calidad de vida en la población universitaria adquiere una especial importancia ya que permite obtener información sobre las condiciones de vida de los universitarios y, sobre todo, de cómo éstos las perciben. Objetivo: Evaluar la calidad de vida de los universitarios que cursan estudios en ciencias de la salud y su relación con diferentes factores tales como: hábitos de vida, parámetros antropométricos y la influencia de las distintas variables sobre su percepción. Material y Método: Estudio transversal de una muestra de 1.753 estudiantes de ciencias de la salud de nueve universidades españolas con diseño muestral aleatorio y estatrificado según curso y facultad al que se le aplicó un cuestionaro ad hoc que recogía todas las variables a estudio. Resultados: La calidad de vida percibida por los participantes fue Me = 75. Los factores explorados de la calidad de vida se co-relacionaron significativamente con la percepción global de calidad de vida de los estudiantes (p.

  6. 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.

  7. 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.

  8. 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.

  9. 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.

  10. 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

  11. 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

  12. 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.

  13. [The mind-brain problem (I): onto-epistemological foundations].

    PubMed

    Goni-Saez, F; Tirapu-Ustarroz, J

    2016-08-01

    Introduccion. La ciencia y la filosofia han abordado a lo largo de la historia del pensamiento y desde diferentes perspectivas epistemicas el problema mente-cerebro. La primera de ellas acota areas especificas de la realidad y construye hipotesis de corto alcance y multiple conectividad intercientifica con el objetivo de validar modelos teoricos; la segunda extiende su arquitectura sistemica al conjunto de lo real (incluida la actividad cientifica). Desarrollo. La complejidad del problema mente-cerebro exige generar un vinculo de conexion disciplinar entre la filosofia y la ciencia; nuestros presupuestos ontoepistemologicos se erigen, por lo tanto, en el marco de una filosofia orientada cientificamente (filosofia cientifica). Se defiende el materialismo emergentista como solucion filosofico-cientifica coherente y contrastable en contraposicion a otras propuestas desarrolladas desde diferentes modelos ontologicos (por ejemplo, dualismo interaccionista, funcionalismo, teoria de la identidad, epifenomenalismo...). Conclusiones. La respuesta al problema mente-cerebro solo es factible desde una neurociencia cognitiva fundamentada filosoficamente: el materialismo emergentista –postulado ontologico– afirma que la mente es una propiedad emergente (novedad cualitativa) del cerebro; el realismo cientifico –postulado epistemologico– sostiene que la neurociencia cognitiva es la herramienta teorico-experimental basica que posibilita el acceso cognoscitivo tanto al cerebro como a sus procesos neurocognitivos. Consideramos que a partir de esta fundamentacion filosofica, la neurociencia cognitiva adquiere legitimidad epistemica para acometer el estudio del proceso mental mas genuinamente humano: la conciencia.

  14. Abundances of Planetary Nebulae in the Outer Disk of M31

    NASA Astrophysics Data System (ADS)

    Kwitter, Karen B.; Lehman, Emma M. M.; Balick, Bruce; Henry, R. B. C.

    2012-07-01

    We present spectroscopic observations and chemical abundances of 16 planetary nebulae (PNe) in the outer disk of M31. The [O III] λ4363 line is detected in all objects, allowing a direct measurement of the nebular temperature essential for accurate abundance determinations. Our results show that the abundances in these M31 PNe display the same correlations and general behaviors as Type II PNe in the Milky Way. We also calculate photoionization models to derive estimates of central star properties. From these we infer that our sample PNe, all near the bright-end cutoff of the planetary nebula luminosity function, originated from stars near 2 M ⊙. Finally, under the assumption that these PNe are located in M31's disk, we plot the oxygen abundance gradient, which appears shallower than the gradient in the Milky Way. Partially based on observations obtained with the Apache Point Observatory 3.5 m telescope, which is owned and operated by the Astrophysical Research Consortium; and 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).

  15. 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

  16. [Prevalence of chronic pruritus in patients of a tertiary care hospital].

    PubMed

    Guerrero-Ramos, Brenda; Hernández-Salazar, Amparo; Villaseñor-Ovies, Pablo; Tinoco-Fragoso, Fátima; Esquivel-Pedraza, Lilly; Domínguez-Cherit, Judith

    2014-01-01

    INTRODUCCIÓN: en ocasiones, el prurito crónico es intratable y afecta la calidad de vida. El objetivo de esta investigación fue describir la prevalencia de prurito en pacientes que acudieron a consulta por primera vez al Instituto Nacional de Nutrición y Ciencias Médicas “Salvador Zubirán”. MÉTODOS: estudio observacional y transversal. Se realizaron pre-encuestas a pacientes de nuevo ingreso, para identificar a quienes tenían prurito. Se investigaron características sociodemográficas, comorbilidades, fármacos de base, características del prurito y el impacto que tenía en la calidad de vida.

  17. 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.

  18. 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

  19. 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.

  20. 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.

  1. 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

  2. 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.

  3. Daniel A. Valencio 1928”1987

    NASA Astrophysics Data System (ADS)

    Schneider, Otto

    Daniel A. Valencio, Professor of Geophysics at Buenos Aires University, died on May 28, 1987, shortly before his 59th birthday. A pioneer of paleomagnetism and tectonophysics in Latin America, Valencio was an outstanding teacher and investigator in these disciplines.His original employment as an exploration geophysicist in Argentina and Cuba led him to become interested in solid Earth sciences in general in the 1960s. At that time, he laid the foundations of the Laboratory of Paleomagnetism at the Departamento de Ciencias Geologicas of Buenos Aires University. This facility has become a very active center of research and teaching, with emphasis on an interdisciplinary approach that includes the participation of an important group of pupils.

  4. Digitalización de espectros fotográficos de standards MK

    NASA Astrophysics Data System (ADS)

    Corti, M.; Morrell, N.

    Se digitalizaron 70 espectros fotográficos de estrellas standards de clasificación MK con tipos espectrales comprendidos entre O3 y A2 y diferentes clases de luminosidad. Las observaciones utilizadas consisten en espectrogramas cuya dispersión recíproca es de 43 Å~mm-1, obtenidos con el telescopio de 1m de Cerro Tololo y su espectrógrafo Cassegrain, durante los años 1982 a 1985. Los trazados digitales se obtuvieron con el instrumento Grant de la Facultad de Ciencias Astronómicas y Geofísicas de La Plata y posteriormente fueron calibrados en longitud de onda y rectificados utilizando rutinas comprendidas dentro del paquete de procesamiento de imágenes IRAF. El material resultante puede utilizarse como ayuda para la clasificación de espectros obtenidos con similar configuración instrumental.

  5. 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.

  6. 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.

  7. [Distribution of butterflies (Lepidoptera: Hesperioidea and Papilionoidea) from Mexico State, Mexico].

    PubMed

    Hernández-Mejía, Claudia; Vargas-Fernández, Isabel; Luis-Martínez, Armando; Llorente-Bousquets, Jorge

    2008-09-01

    The State of Mexico is a region with great biological diversity, owing to its geographical and ecological features. Regarding Hesperioidea and Papilionoidea, 15% of the Mexican species are recorded in the State of Mexico, 17% of which are endemic to the country. A checklist of the two superfamilies for the State of Mexico was integrated, based on published literature and databases at the Museo de Zoología of the Facultad de Ciencias, UNAM. The checklist is composed by six families, 22 subfamilies, 197 genera and 325 species (95 Hesperiidae, 19 Papilionidae, 35 Pieridae, 54 Lycaenidae, 20 Riodinidae, and 102 Nymphalidae). A list of each species is presented, including collecting localities, flight month, and whether data correspond to scientific collection records or literature.

  8. 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.

  9. Fermi energy instability in resonant tunneling

    NASA Astrophysics Data System (ADS)

    Claro, Francisco; Inkoferer, Jutta; Obermeir, Gustav

    2001-03-01

    In resonant tunneling two different instabilities may arise induced by the electron-electron interaction, depending on whether the conduction channel is at the emitter Fermi energy, or at the bottom of the emitter Fermi sea. The latter leads to a well understood multistable regime in the device characteristics. The former was found in the past for the case when a magnetic field is present in the direction of the current flow*. We shall show that the external field is not required, and that actually the instability can take place in the presence of zero, one and two dimensional quantum wells. Supported in part by FONDECYT 1990425 and Catedra Presidencial en Ciencias *P.Orellana, E.Anda and F.Claro, Phys.Rev.Lett. 79, 1118 (1997)

  10. 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

  11. Long-pulse magnetic field facility at Zaragoza

    NASA Astrophysics Data System (ADS)

    Algarabel, P. A.; del Moral, A.; Martín, C.; Serrate, D.; Tokarz, W.

    2006-11-01

    The long-pulse magnetic field facility of the Laboratorio de Magnetismo - Instituto de Ciencia de Materiales de Aragón (Universidad de Zaragoza-CSIC) produces magnetic fields up to 31, with a pulse duration of 2.2s. Experimental set-ups for measurements of magnetization, magnetostriction and magnetoresistance are available. The temperature can be controlled between 1.4 and 335 K, being the inner bore of the He cryostat of 22.5 mm. Magnetization is measured using the mutual induction technique, the magnetostriction is determined with the strain-gage and the capacitive cantilever methods, and the magnetoresistance is measured by means of the aclock-in technique in the 4-probes geometry. An overview of the facility will be presented and the presently available experimental techniques will be discussed.

  12. 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

  13. [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. PMID:17893754

  14. 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.

  15. [Echinoderms (Echinodermata) of the Mexican Caribbean].

    PubMed

    Laguarda-Figueras, Alfredo; Solis-Marín, Francisco A; Durán-González, Alicia; Ahearn, Cynthia Gust; Buitrón Sánchez, Blanca Estela; Torres-Vega, Juan

    2005-12-01

    A systematic list of the echinoderms of the Mexican Caribbean based on museum specimens of the Colección Nacional de Equinodermos, Instituto de Ciencias del Mar y Limnología, Universidad Nacional Autónoma de México and the National Museum of Natural History, Smithsonian Institution, Washington, D.C. is presented. This list reveals an important echinoderm biodiversity in the Mexican Caribbean, where five of the six echinoderm classes are represented. A total of 178 echinoderm species is recorded, distributed in 113 genera, 51 families and 22 orders. 30 new records for the Mexican Caribbean are presents: Crínoidea (three), Asteroidea (two), Ophiuroidea (eleven), Echinoidea (one), Holothuroidea (thirteen).

  16. An ear turned to ``The Cosmos'': 50 projects to discover the universe

    NASA Astrophysics Data System (ADS)

    del Puerto, Carmen

    2011-06-01

    In 1609, as Galileo pointed the sky with a telescope, he observed Jupiter's satellites and changed our vision of the universe. Four hundred years later, we celebrate this event all over the world, and also in the Canaries. 2009, the International Year of Astronomy, is a very special year for the Science and Cosmos Museum (Museo de la Ciencia y el Cosmos). This was the first museum in Spain supported by a public entity, The Local Government of Tenerife (Cabildo de Tenerife), through its Autonomous Council of Museums (Organismo Autónomo de Museos y Centros), and a research centre, the Instituto de Astrofísica de Canarias. Fifteen years later, this museum, which receives 50,000 visitors a year, celebrates the International Year of Astronomy with fifty projects described in this paper.

  17. 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. PMID:21874154

  18. Experiencia - Taller: sondas espaciales y satélites artificiales

    NASA Astrophysics Data System (ADS)

    Martinenco, F. V.

    Results of a simple experiment made by Astronomy students (5th year, Liceo Víctor Mercante, UNLP), and assistants to the 7th Pro-Ciencia Congress (Chivilcoy, May 2000) and by amateur astronomers, are presented. Its goal is to show, in a simple and conceptual way, how the Magellan probe in orbit around Venus codifies and transmits data back to the Earth. The experiment, which was adapted from my personal experience at the International Space Camp 1999 (Huntsville, USA), is made with scale models representing details of the planet's surface, while a color code and binary numbers are used to codify the data. Educational material from CONAE (National Commission of Space Activities, Argentina) is used to further illustrate the subject.

  19. 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.

  20. [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.

  1. 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.

  2. Earth Occultation Monitoring of the Hard X-ray/Low-Energy Gamma Ray Sky with GBM

    NASA Astrophysics Data System (ADS)

    Cherry, Michael L.; Camero-Arranz, A.; Case, G. L.; Chaplin, V.; Finger, M. H.; Jenke, P. A.; Rodi, J. C.; Wilson-Hodge, C. A.; GBM Earth Occultation Team

    2012-01-01

    By utilizing the Earth occultation technique (EOT), the Gamma-Ray Burst Monitor (GBM) instrument aboard Fermi has been used to make nearly continuous full-sky observations in the 8-1000 keV energy range. The GBM EOT analysis program currently monitors an input catalog containing 235 sources. We will present the GBM catalog of sources observed in the first 3 years of the EOT monitoring program, with special emphasis on the high energy (>100 keV) and time-variable sources, in particular the Crab, Cyg X-1, and A0535+26. We will also describe the initial results of an all-sky imaging analysis of the EOT data, with comparisons to the Swift, INTEGRAL, and Fermi LAT catalogs. This work is supported by the NASA Fermi Guest Investigator program, NASA/Louisiana Board of Regents, and Spanish Ministerio de Ciencia de Innovacion.

  3. Fountain rainbows.

    PubMed

    Gedzelman, Stanley David; Hernández-Andrés, Javier

    2008-12-01

    We present the first measurements of radiance spectra of rainbows. The bows on two sunny days (3 and 6 June 2008) were produced by the fountain in the Parque de las Ciencias, Granada, Spain, that consists of a rectangular perimeter of 40 spray nozzles. Optical thickness of the spray from each nozzle was approximately 0.5. Spectral purity of the primary bow was highest for orange and blue, reaching values of 23% and 7%, respectively, while skylight 90 degrees from the Sun had a color purity of 34% (on 6 June). The secondary bow had much lower color purity with red absent because the regions around the bows and in Alexander's dark band were pale blue. The narrow sickle shape of the chromaticity curves for the primary bows and the absence of supernumerary bows indicated that the drop radius was between 0.2 and 0.4 mm. PMID:19037346

  4. 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.

  5. 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

  6. 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

  7. Accretion Rates on Pre-main-sequence Stars in the Young Open Cluster NGC 6530

    NASA Astrophysics Data System (ADS)

    Gallardo, José; del Valle, Luciano; Ruiz, María Teresa

    2012-01-01

    It is well accepted that during the star formation process, material from a protoplanetary disk is accreted onto the central object during the first ~1-5 Myr. Different authors have published measurements of accretion rates for young low- and intermediate-mass stars in several nearby star-forming regions (SFRs). Due to its somewhat larger distance, the SFR M8 (the Lagoon Nebula) has not been studied to the same extent, despite its abundant population of young stellar objects. We have obtained optical band low-resolution spectra of a sample of pre-main-sequence stars in the open cluster NGC 6530 located in the aforementioned nebulae using the Gemini Multi Object Spectrograph at Gemini-South in multi-object mode. Spectra cover the Hα emission line used to measure the accretion rate, following the method presented by Natta et al. The observed spectral characteristics are fully consistent with pre-main-sequence stars, showing lithium absorption lines, which are very common in young stellar objects, as well as prominent and broad Hα emission lines, indicating a T Tauri evolutionary stage. This work presents the first determinations of mass accretion rates of young stellar objects in the open cluster NGC 6530, confirming that they are classical T Tauri stars going through the accretion phase. These observations contribute to a better understanding of the stellar content and evolutionary phase of the very active Lagoon Nebula SFR. 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 Ciencia e Tecnologia (Brazil), and Ministerio de Ciencia, Tecnología e Innovación Productiva

  8. The Young Outer Disk of M83

    NASA Astrophysics Data System (ADS)

    Davidge, T. J.

    2010-08-01

    Deep near-infrared images recorded with NICI on Gemini South are used to investigate the evolved stellar content in the outer southeast quadrant of the spiral galaxy M83. A diffuse population of asymptotic giant branch (AGB) stars is detected, indicating that there are stars outside of the previously identified young and intermediate age star clusters in the outer disk. The brightest AGB stars have M K >= -8, and the AGB luminosity function (LF) is well matched by model LFs that assume ages <=1 Gyr. The specific star formation rate (SFR) during the past few Gyr estimated from AGB star counts is consistent with that computed from mid-infrared observations of star clusters at similar radii, and it is concluded that the disruption timescale for star clusters in the outer disk is Lt1 Gyr. The LF and specific frequency of AGB stars vary with galactocentric radius, in a manner that is indicative of lower luminosity-weighted ages at larger radii. Modest numbers of red supergiants are also found, indicating that there has been star formation during the past 100 Myr, while the ratio of C stars to M giants is consistent with that expected for a solar metallicity system that has experienced a constant SFR for the past few Gyr. The results drawn from the properties of resolved AGB stars are broadly consistent with those deduced from integrated light observations in the UV. Based on observations obtained at the Gemini Observatory, which is operated by the Association of Universities for Research in Astronomy, Inc., under a co-operative 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 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).

  9. [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

    Introducción: el personal de salud se autoaplica insuficientes estrategias para reducir sus propios factores de riesgo cardiovascular. El objetivo fue investigar la prevalencia de sobrepeso, obesidad y síndrome metabólico en personal de salud.Métodos: diseño transversal de enero a abril de 2014, en 735 trabajadores de la UMAE Especialidades La Raza. El diagnóstico de sobrepeso y obesidad se estableció acorde a criterios de la OMS y síndrome metabólico NCEP ATP-III. En 250 participantes se realizó perfil de lípidos y química sanguínea. Se aplicó estadística descriptiva, chi cuadrada, t de Student o Kruskal-Wallis al comparar los grupos, el valor de significancia fue p < 0.05.Resultados: incluimos 496 mujeres y 239 hombres (entre médicos, enfermeras y otros). Tuvieron sobrepeso 38 %, y obesidad 22 %. Encontramos hiperglucemia de ayuno > 126 mg/dl 5.1 %, entre 100-126 mg/dl 17.4 %, hipertrigliceridemia 40.4 %; colesterol-HDL < 40 mg/dl en 66 % de hombres y colesterol-HDL < 50 mg/dl en 51.4 % de mujeres. La cintura 93 ± 11cm en hombres frente a 88 ± 13 cm en mujeres. El índice cintura/talla en el grupo de peso ideal fue 0.048 ± 0.04, en el de sobrepeso 0.55 ± 0.04 y en el de obesidad 0.65 ± 0.064. Tuvieron síndrome metabólico 30.6 %, tabaquismo 21.6 % y consumo de alcohol 35 %. Solo 2 % presentaron presión arterial > 135/85.Conclusiones: la prevalencia de obesidad y sobrepeso del personal de salud es de 60 % y de síndrome metabólico 30 %, por lo que es necesario tomar acciones inmediatas que modifiquen el estilo de vida del personal de salud.

  10. Prevalence of factors related to the bone mass formation of children from a cohort in Southern Brazil.

    PubMed

    Doumid Borges Pretto, Alessandra; Correa Kaufmann, Cristina; Ferreira Dutra, Gisele; Pinto Albernaz, Elaine

    2014-12-17

    Introducción: La cantidad de masa ósea adquirida en las primeras etapas de la vida es un importante factor determinante de su pico y el riesgo futuro de osteoporosis y fracturas. Objetivo: Describir la prevalencia de factores que contribuye a la formación de la masa ósea en niños de una cohorte del sur de Brasil. Métodos: Estudio de cohorte retrospectiva con el hospital de todos los nacimientos (2741) se produjo en septiembre / 2002 a mayo / 2003 y el seguimiento de una muestra aleatoria de un 30,0% de los mismos (uno, tres y seis meses y ocho años de edad). En una visita a los ocho años de edad, aplicó un cuestionario con preguntas relacionadas con la alimentación y la actividad física. Resultados y Discusión: De los 616 niños, el 51,3% eran hombres, el 70,3% de raza caucásica, cerca de la mitad pertenecían a la clase económica C, 20,5% tenían sobrepeso, el 16,9% eran obesos y 71,2% sedentarios. La ingesta de alimentos es bajo consumo de frutas, verduras, productos lácteos, carne, los cereales y los tubérculos. La administración de vitamina D en los primeros seis meses de vida fue seguido por 14,1% de los prematuros, el 16,1% de los recién nacidos con bajo peso al nacer, el 24,2% de destete en el primer mes y sólo el 16,4% a los tres meses. Conclusión: Los niños evaluados tienen un bajo consumo de nutrientes, entre ellos el calcio, deficiente administración de vitamina D en el primer semestre de vida, poco actividad física regular y la alta prevalencia del sobrepeso y la obesidad son factores que pueden afectar a la formación de masa ósea.

  11. [VITAMIN D DEFICIENCY AMONG CHILDREN AND ADOLESCENTS WITH NORMAL NUTRITIONAL STATUS].

    PubMed

    Durá-Travé, Teodoro; Gallinas-Victoriano, Fidel; Chueca Guindulain, María Jesús; Berrade-Zubiri, Sara

    2015-09-01

    Objetivo: analizar la prevalencia de la deficiencia de vitamina D a lo largo de un año natural en una población pediátrica con un estado nutricional normal. Material y métodos: estudio transversal clínico y analítico (calcio, fósforo, fosfatasa alcalina, calcidiol y hormona paratiroidea) en 413 sujetos (entre 3,1 y 15,4 años): 227 escolares (96 varones y 131 mujeres) y 186 adolescentes (94 varones y 92 mujeres), de raza caucásica y estado nutricional normal, durante el año 2014. Para definir la deficiencia de vitamina D se han aplicado los criterios de la Sociedad Americana de Endocrinología. Resultados: los niveles de calcidiol eran más bajos en primavera (25,96 ± 6,64 ng/ml) y alcanzaban su máximo nivel en verano (35,33 ± 7,51 ng/ml); mientras que los de PTH eran más bajos en verano (27,13 ± 7,89 pg/ml) y alcanzaban su máximo nivel en otoño (34,73 ± 15,38 pg/ml). La prevalencia de deficiencia de vitamina D era del 14,3% en verano y del 75,3% en primavera. En 8 casos (1,9%) existían cifras de PTH compatibles con hiperparatiroidismo secundario. Existía una correlación negativa entre calcidiol y PTH (p < 0,01). No existía correlación entre IMC y calcidiol. Conclusión: en la población pediátrica con una situacion nutricional normal existe una alta prevalencia de deficiencia de vitamina D en los meses de otoño e invierno y, especialmente, en primavera, y habría que considerar la necesidad de administrar suplementos vitamínicos y/o ingerir mayores cantidades de sus fuentes dietéticas naturales.

  12. Effects of quercetin on polychlorinated biphenyls-induced liver injury in rats.

    PubMed

    Rocha de Oliveira, Cléia; Ceolin, Juliana; Rocha de Oliveira, Renata; Gonçalves Schemitt, Elizângela; Raskopf Colares, Josieli; De Freitas Bauermann, Liliane; Hilda Costabeber, Ijone; Morgan-Martins, Maria Isabel; Mauriz, José L; Da Silva, Juliana; Reyes, Juliana Moysés; Possa Marroni, Norma

    2014-05-01

    Introducción: los bifenilospoliclonados (PCBs) son pesticidas ampliamente usados en agricultura que pueden inducir daños irreversibles particularmente en el hígado. El estrés oxidativo ha sido implicado en diversas patogénesis hepáticas, incluidas las relacionadas conPCBs. La quercetina, un flavonoide de la dieta, ha demostrado tener un potente efecto antioxidante en diversos modelos de patología hepática. Objetivo: Evaluar el estrés oxidativo hepático inducido por PCBs y la actividad antioxidante de la quercetina. Metodología: Se usaron ratas macho de raza Wistar (n = 36), divididas en cuatro grupos: control, quercetina (50 mg/kg/día), PCBs (0,4 ml/kg/día) y ratas tratadas tanto con PCBs como con quercetina. Transcurridos 25 días de tratamiento se recogieron muestras de sangre, para evaluar la integridad hepática (AST, ALT y ALP), y de tejido para cuantificar el estrés oxidativo (TBARS), actividad antioxidante (SOD, CAT, GPx), daño al DNA (ensayo de micronúcleos) y daño histológico. Resultados: la concentración de TBARS y la actividad SOD fueron significativamente mayores en los animales que recibieron PCBs que en los que recibían quercetina. La actividad de CAT y GPx se redujo con los PCBs y se incrementó al administrar quercetina. Los análisis histológicos y de micronúcleos mostraron daño hepático y al DNA respectivamente inducido por PCBs que eran revertidos con el tratamiento con quercetina. Conclusion: La contaminación con PCBs induce un incremento en la peroxidación lipídica, modificación en la actividad de enzimas antioxidantes, daño histológico y al DNA en el hígado, siendo el antioxidante quercetina es capaz de reducir dichos cambios.

  13. [Epidemiologic features in patients with antihistamine-resistant chronic urticaria].

    PubMed

    Sánchez Borges, Mario; Tassinari, Stefano; Flores, Adriana

    2015-01-01

    Antecedentes: en la actualidad, la información disponible acerca de las características particulares de los pacientes que padecen urticaria crónica espontánea resistente a tratamiento es muy limitada. Objetivo: investigar las características demográficas y clínicas de los pacientes con urticaria crónica espontánea resistente a tratamiento. Material y método: estudio descriptivo, retrospectivo, de la información clínica y demográfica de pacientes que consultaron en los servicios de Alergología de dos hospitales de Caracas, Venezuela, que padecían urticaria espontánea de más de seis semanas de evolución y que no habían respondido a por lo menos un curso de tratamiento con antihistamínicos. Resultados: la urticaria crónica espontánea resistente a tratamiento fue más frecuente en pacientes de sexo femenino, de edades entre 20 y 59 años, de raza caucásica americana, con predominio de síntomas moderados, duración de las lesiones individuales de menos de tres horas y diámetro de los habones entre 1 y 3 cm. El angioedema solo o asociado con urticaria afectó a 14% de los pacientes. Las enfermedades asociadas con mayor frecuencia fueron: asma, rinitis y rinosinusitis, enfermedades tiroideas e hipertensión arterial. Conclusión: la urticaria crónica espontánea resistente a tratamiento constituye un subgrupo muy frecuente de urticaria crónica y representa un importante desafío terapéutico. En este estudio no se demostraron características diferenciales en comparación con las de los pacientes con urticaria crónica espontánea que responden al tratamiento con antihistamínicos.

  14. [Maternal and fetal morbidity in patients with premature rupture of the membrane after 27-week gestation. Causes and costs].

    PubMed

    Nava Flores, Jorge; Enríquez Miranda, Ma Cecilia; Hernández-Valencia, Marcelino

    2003-07-01

    Premature rupture of the membranes (PROM) occurs in a third of the childbirths preterm, this represents 8% of all pregnancies, with same morbidity and mortality in developing and developed countries, PROM is the more common cause of neonatal morbidity and mortality, making this obstetric complication a worldwide problem of health, since it contributes to the economic problem for the cost risen in medical attention for both, mothers and live birth. PROM is considered a mutifactorial entity. This study was carried out in the Hospital de Ginecología y Obstetricia of the Centro Médico "La Raza" in Mexico City, where women entered in serial form with pregnancies from 27 to 34 weeks of gestation and spontaneous PROM, without any other pathology. 120 patients were included, with 26.8 +/- 5.9 year-old age. The gestational age with more frequency of PROM were from 30 to 33 weeks, 22.5% of the patients had 4 days with PROM, 6 of this cases arrived up to 13 days with this complication at delivery. 2.5% of the patients presented deciduitis, with adequated response to the use of antibiotics. When analyzing the hospital stay, a stay was observed from 4 to 7 days (5.26 +/- 1.96 M +/- SD), with a total cost for maternal stay of 2 millions 445,650 pesos. Those babies born had an average of 23 days of hospital stay and the total cot of the days of stay was 4 millions 963,978 pesos. Other costs were the attention of maternal and pediatrics specialty, the obstetric resolution of the pregnancy, obstetric ultrasonography and crystallographies. Thus, the total costs of the attention of this complication in these patients with PROM was of 10 millions 296,988 pesos. The international reference is the American dollar that was in 10 pesos for dollar to the moment of this study. The maternal morbidity is low to that described in previous studies, but in spite of the exhaustive efforts on the prevention, prediction, diagnosis and treatment, the premature rate due to PROM has not diminished

  15. Chemical Soil Degradation n the Area of the Głogów Copper Smelter Protective Forest/ Degradacja Ziemi Na Terenach Byłej Strefy Ochronnej Huty Miedzi Głogów

    NASA Astrophysics Data System (ADS)

    Kostecki, Jakub; Greinert, Andrzej; Drab, Michał; Wasylewicz, Róża; Walczak, Barbara

    2015-06-01

    Earth surface is under the continous influence of the environmental factors - both natural and anthropogenic. The significant impact on the environment can be noted in areas adjacent to the metal industry plants, in a consequence of pollutants emission, especially dusts containing the heavy metals, into the atmosphere,. In the surroundings of Głogów Copper Smelter (GCS) elevated amounts of copper and lead has been noted. In the soils of the test sites were found up to 5250 mg kg-1 Cu and 1290 mg kg-1 Pb. The forest litter contained 3.3-5.1 more Cu and 3.9-8.6 Pb than the humic horizon of the soil. Analyse of the different soils covering the GCS protective forest area let specify the stabilising role of particle size distribution, TOC content and the soil reaction to Cu and Pb migration in the environment. Powierzchnia ziemi jest nieustannnie narażona na oddziaływania o charakterze naturalnym i antropogenicznym. Znaczące oddziaływanie jest łatwo zauważalne na terenach przemysłowych. Szczególnie na obszarach objętych wydobyciem i przeróbką metali. Na terenach przyległych do Huty Miedzi Głogów stwierdzono wysoką koncentrację miedzi i ołowiu sięgającą 5250 mg kg-1 Cu i 1290 mg kg-1 Pb. Poziom ściółki leśnej zawierał 3,3-5,1 raza więcej Cu i 3,9-8,6 Pb niż poziom próchniczny analizowanych gleb. Analiza różnych gleb pokrywających las ochronny HMG pozwoliła wskazać na znaczącą rolę składu granulometrycznego, zawartości węgla organicznego oraz odczynu na stabilizację migracji Cu i Pb w środowisku.

  16. [Fever of unknown origin, comparing two series with 26 years of difference].

    PubMed

    Casarrubias-Ramírez, Moisés; Alfaro-Mejía, José Alfredo; De Santiago-Leaños, Juan; Mendoza-Álvarez, Sergio Alberto; Pineda-Galindo, Luis Francisco; Vera-Lastra, Olga Lidia

    2015-01-01

    Introducción: la fiebre de origen oscuro (FOO) es un síndrome de abordaje difícil y espectro cambiante. El objetivo fue comparar dos series de FOO estudiadas en el departamento de Medicina Interna del Hospital de Especialidades del Centro Médico La Raza.Métodos: fue un estudio comparativo de datos secundarios: los datos de la serie 1979-87, que fueron publicados por Frati et al. y los de la serie 2004-14, registrados en la base de datos de FOO del departamento de Medicina Interna. Se compararon datos demográficos, diagnósticos finales y pruebas diagnósticas utilizadas. Se describen mediana y amplitud para las variables numéricas y distribución de frecuencias para las variables nominales. El análisis bivariado se hizo con chi cuadrada o prueba de Fisher con los programas SPSS versión 17.0 para MAC y open epi versión 3.7.Resultados: se incluyeron 127 pacientes en la serie 1979-87, y 118 en la 2004-14. La serie más reciente tuvo menos casos ocasionados por infecciones, (p = 0.024), y más enfermedades inflamatorias no infecciosas (p = 0.0004). Se mantuvieron constantes las enfermedades neoplásicas y los casos con diagnóstico desconocido. Variaron poco las pruebas de laboratorio realizadas y su utilidad diagnóstica; en cambio los estudios de imagen fueron menos útiles en la serie 2004-14 (p = 0.00003). Las biopsias y la laparotomía fueron frecuentemente realizadas y útiles en ambas series.Conclusiones: En la última serie hubo más enfermedades inflamatorias no infecciosas a expensas de un menor número de infecciones. Los estudios invasivos siguen siendo necesarios.

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

    SciTech Connect

    Pereira, R.; Silva, N.; Quintal, C.; Abreu, R.; Andrade, J.; Dantas, L.

    2007-03-15

    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 of 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 al

  18. Influence of eNOS gene 4a/b VNTR polymorphism on development of endothelial dysfunction and respiratory system disorders in children - residents of radioactively contaminated areas.

    PubMed

    Stepanova, Ye I; Kolpakov, Ye; Zyhalo, V M; Lytvynets, O M; Kondrashova, V H; Vdovenko, V Yu; Skvarska, O O; Leonovych, O S

    2015-12-01

    Meta roboty – doslidyty rol' polimorfizmu geniv eNOS u rozvytku endotelial'noI dysfunktsiI ta funktsional' nykh rozladiv systemy dykhannia u ditey – meshkantsiv radioaktyvno zabrudnenykh terytoriy.Materialy i metody doslidzhennia. Dlia vyznachennia mozhlyvykh asotsiatyvnykh zv’iazkiv polimorfizmu u 4 mu introni gena eNOS z pokaznykamy, shcho kharakteryzuiut' funktsional'nyy stan endoteliiu ta bronkholegenevoI sys temy, provedeno obstezhennia 184 ditey. Z nykh osnovnu grupu sklaly 135 ditey – meshkantsiv radioaktyvno zabrud nenykh terytoriy, kontrol'nu – 49 ditey, iaki prozhyvaly v „chystykh ” shchodo radioaktyvnogo zabrudnennia regionakh i ne nalezhaly do postrazhdalykh vnaslidok Chornobyl's'koI avariI kontyngentiv. Provodyly molekuliarno gene tychne doslidzhennia z vyznachenniam polimorfizmu v 4 mu introni gena eNOS. Doslidzhennia ventyliatsiynoI spro mozhnosti legeniv otsiniuvaly za dopomogoiu metodu pnevmotakhografiI. Dlia reiestratsiI endoteliyzalezhnoI reaktsiI sudynnogo rusla na zminy umov krovopostachannia vykorystovuvaly termografichnyy sposib. Vyznachennia rivniv azotystykh spoluk NO2 ta NO3 provodyly za standartnoiu metodykoiu z vykorystanniam reaktyvu Grissa. Riven' inkorporovanogo 137Cs v organizmi vyznachaly za dopomogoiu lichyl'nyka vyprominiuvannia liudyny Skrynner 3M vyrobnytstva Instytutu ekologiI liudyny.Rezul'taty. Dity osnovnoI grupy za chastotoiu polimorfnykh 4a/b genotypiv ta aleliv 4a i 4b gena eNOS ne vidriznia lysia vid kontroliu ta danykh literatury. U ditey osnovnoI grupy z genotypom 4a/4b u porivnianni z dit'my, iaki ma ly genotyp 4b/4b, vidmichalosia zbil'shennia tryvalosti vidnovlennia krovoobigu do vykhidnogo rivnia pislia ok liuziynoI proby; sposterigalosia znyzhennia vmistu nitrytu v syrovattsi krovi; zmenshennia integral'nykh pokaznykiv elastychnosti i roztiazhnosti legenevoI tkanyny, prokhidnosti dykhal'nykh shliakhiv; u 1,5 raza chastishe reiestruvalysia oznaky bronkhospazmu. Tsi nespryiatlyvi efekty buly

  19. 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

  20. 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

  1. 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

  2. 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

  3. 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

  4. 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

  5. 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).

  6. Breakfast of champions or kiss of death? Survival and sexual performance of protein-fed, sterile Mediterranean fruit flies (Diptera: Tephritidae)

    SciTech Connect

    Yuval, B.; Maor, M.; Levy, K.; Kaspi, R.; Taylor, P.; Shelly, T.

    2007-03-15

    dieta sobre los obstaculos sucesivos que los machos tienen que superar para inseminar las hembras, i.e., unir con otros machos en areas para el apareamiento, copula de las hembras, almacenar esperma e inhibir el re-apareamiento de hembras. Ademas discutimos los efectos de la dieta sobre el exito de su actividad forrajera despues de ser liberados, la longevidad y la habilidad para aguantar la inanicion. Mientras que la alimentacion con proteina universalmente aumentan el exito sexual de los machos naturales, su efecto sobre los machos esteriles varia segun la raza, el lugar de los experimentos y las condiciones ambientales. En algunos casos, los tratamientos que resultaron con mejor desempeno sexual fueron asociados significativamente con el aumento de la vulnerabilidad a la inanicion. Sin embargo, ninguna dieta en particular afecto la habilidad de los machos esteriles para encontrar nutrientes en el campo cuando fueron disponibles. Nosotros sugerimos que puede ser mejor el liberar moscas que tienen una vida relativamente corta y que son mas competidoras, en vez de moscas que tienen una vida larga y sexualmente inefectiva. (author)

  7. 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.

  8. 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).

  9. 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.

  10. 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.

  11. 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.

  12. 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.

  13. 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.

  14. 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.

  15. [The healthy eating index of new students at an university of Mexico].

    PubMed

    Muñoz-Cano, Juan Manuel; Córdova-Hernández, Juan Antonio; del Valle-Leveaga, David

    2015-04-01

    Introducción: El principal factor asociado al incremento de la prevalencia de enfermedades no transmisibles es el consumo de alimentos industrializados modernos. Objetivo: Evaluar la calidad de la dieta de estudiantes de nuevo ingreso. Métodos: Se colectaron datos de 3550 estudiantes con edad  18.65 años mediante un cuestionario de frecuencia de consumo de alimentos. Se evaluaron con diez variables que se calificaron en tres categorías: saludable, necesita cambios y poco saludable. Se compararon los resultados de los de ciencias de la salud con los otros campus. Resultados: Hubo disminución del consumo de alimentos que deberían ser diario como cereales integrales, verduras y frutas. Se encontró incremento de alimentos que deberían ser de consumo ocasional a al menos 1 a 2 por semana. Los puntajes del índice de alimentación saludable fueron 80.2% en la categoría “poco saludable”, 19.7% en “necesita cambios” y 0.1% en “saludable”. Conclusiones: Los resultados son consecuencia de la disminución del consumo de alimentos de la dieta tradicional de Mesoamérica. No se encontró efecto de la selección de campus con el patrón de consumo de alimentos.

  16. Waist-to-height ratio (WHtR) and triglyceride to HDL-C ratio (TG/HDL-c) as predictors of cardiometabolic risk.

    PubMed

    Weiler Miralles, Clara Silvana; Wollinger, Luana Maria; Marin, Débora; Genro, Julia Pasqualini; Contini, Veronica; Morelo Dal Bosco, Simone

    2015-05-01

    Introducción: La concentracion excesiva de grasa en la region abdominal se relaciona con un mayor riesgo de desarrollar enfermedad cardiovascular (ECV). Se han realizado estudios para identificar los indicadores simples y eficaces de la obesidad abdominal y el riesgo cardiometabolico asociados con el uso de parametros simples, como las medidas antropometricas y bioquimicas. El / alta densidad de colesterol de lipoproteinas de trigliceridos (TG / HDL-c) se ha propuesto como un enfoque mas practico y facil de usar marcador aterogenico, junto con la relacion cintura-estatura (RCEst), lo que hace que una herramienta superior para separar cardiometabolico riesgos relacionados con el sobrepeso / obesidad cuando se compara con el indice de masa corporal (IMC). Objetivo: Verificar la aplicabilidad de la RCEst y la relacion TG / HDL-c como predictores de riesgo cardiometabolico. Métodos: Este estudio transversal se llevo a cabo en el Departamento de Nutricion del Centro Universitario UNIVATES, donde se recogieron datos antropometricos y bioquimicos de los participantes. El analisis estadistico se realizo mediante el paquete estadistico para el software de Ciencias Sociales (SPSS) 20,0, con un nivel de significacion del 5% (p.

  17. 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.

  18. 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).

  19. 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.

  20. Quantum Simulation for Open-System Dynamics

    NASA Astrophysics Data System (ADS)

    Wang, Dong-Sheng; de Oliveira, Marcos Cesar; Berry, Dominic; Sanders, Barry

    2013-03-01

    Simulations are essential for predicting and explaining properties of physical and mathematical systems yet so far have been restricted to classical and closed quantum systems. Although forays have been made into open-system quantum simulation, the strict algorithmic aspect has not been explored yet is necessary to account fully for resource consumption to deliver bounded-error answers to computational questions. An open-system quantum simulator would encompass classical and closed-system simulation and also solve outstanding problems concerning, e.g. dynamical phase transitions in non-equilibrium systems, establishing long-range order via dissipation, verifying the simulatability of open-system dynamics on a quantum Turing machine. We construct an efficient autonomous algorithm for designing an efficient quantum circuit to simulate many-body open-system dynamics described by a local Hamiltonian plus decoherence due to separate baths for each particle. The execution time and number of gates for the quantum simulator both scale polynomially with the system size. DSW funded by USARO. MCO funded by AITF and Brazilian agencies CNPq and FAPESP through Instituto Nacional de Ciencia e Tecnologia-Informacao Quantica (INCT-IQ). DWB funded by ARC Future Fellowship (FT100100761). BCS funded by AITF, CIFAR, NSERC and USARO.

  1. A Cloud-Tracking Tool For Planetary Orbiter Images

    NASA Astrophysics Data System (ADS)

    Gil, R.; Luz, D.; Berry, D.; Roos-Serote, M.

    2005-08-01

    During their operations phase, planetary missions continuously produce a wealth of data that tend to overwhelm research teams. Spectral imagers, in particular, produce data cubes in which the wavelength dimension adds to the two spatial dimensions. Tracking of atmospheric features in order to derive winds and the construction of global maps from such large data volumes becomes particularly time-consuming if done manually. This highlights the importance of automated procedures capable of analysing sequences of data cubes with minimal user interaction. A tool for cloud tracking for such a purpose is currently under development in our group. In its present state it is based on synthetic images and uses a simple method of multiple matrix comparison to derive wind components. Deriving winds from data from the Venus Express - Visible and InfraRed Thermal Imaging Spectrometer (VIRTIS) instrument will be a possible application. We shall present an overview of the method, its benchmarking and the current status and future development of the project. [R. Gil is currently supported by Fundacao para a Ciencia e a Tecnologia, Portugal, project PDCTU/FNU/49822/2003. D. Luz acknowledges support from FCT, grant SFRH-BPD-3630-2000.

  2. A new reference collection of documented human skeletons from Mérida, Yucatan, Mexico.

    PubMed

    Chi-Keb, J R; Albertos-González, V M; Ortega-Muñoz, A; Tiesler, V G

    2013-10-01

    This report documents the history and composition of a new reference collection currently composed of 84 identified human skeletons from the modern cemetery of Xoclán in Mérida, Yucatan, Mexico. The skeletal sample is the first of its kind in the Yucatan peninsula, a region with a population short of two million mostly local and non-local Mexican residents and descendants of the ancient Maya. The growing collection is curated at the Facultad de Ciencias Antropológicas (School of Anthropological Sciences) of the Autonomous University of Yucatan. Here we describe recovery procedures, preservation, background information and validation measures of the individuals who make up the collection. Detailed information on the generational pattern, sex, and age distribution, along with socioeconomic context and provenance of the skeletons are provided. The majority of the skeletal series is represented by males and by older individuals of both sexes. Almost all of these individuals come from Mérida's middle and lower socioeconomic sectors and died within the urban city boundaries. Biographic information was collected on each individual at the municipal civil registry and confronted with information of national and municipal censuses (2000 and 2005), to be validated and to be discussed here in terms of the representativeness of the reference series and its potential uses in forensic, anthropological and medical research. PMID:23830157

  3. 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.

  4. IGBP: Crown jewel or prodigal son?

    NASA Astrophysics Data System (ADS)

    Roederer, Juan G.

    At its 1986 General Assembly in Bern, Switzerland, the International Council of Scientific Unions (ICSU) launched what promises to be the biggest and most ambitious enterprise of international scientific cooperation (see “ICSU Gives Green Light to IGBP,” Eos, 67, p. 777, 1986). The International Geosphere-Biosphere Program (IGBP), known also as “Global Change,” has as its main objective to describe and understand the interactive physical, chemical and biological processes that regulate the total Earth system, the unique environment that it provides for life, the changes that are occurring in this system, and the manner in which they are influenced by human actions.It should be no wonder, then, that this year's ICSU General Committee Meeting at the Academia das Ciencias de Lisboa (Lisbon, Portugal, October 11-14) was virtually dominated by IGBP matters, even during the discussion of agenda items that did not include this subject explicitly. It is fair to say that the Unions are just becoming fully aware of the real magnitude of the program they themselves helped launch in Bern in 1986—and of how little input and control they have had so far in its development. An indication of this “awakening” was already apparent during the ICSU General Assembly in Beijing in 1988, but the full realization of the enormous impact and ramifications of IGBP inside and outside ICSU is emerging only now.

  5. 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.

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

    PubMed Central

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

    2016-01-01

    Abstract Background 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. New information 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.

  7. The Seebeck Coefficient in Oxygen Enriched La2NiO4

    NASA Astrophysics Data System (ADS)

    Bach, Paul; Leboran, Victor; Rivadulla, Francisco

    2013-03-01

    Oxide-based devices show promise for themoelectric applications due to their chemical stability and straightforward fabrication. The La2NiO4+δ system has been predicted to show an increased thermopower coupled with an increased electrical conductivity around δ = 0 . 05 [Pardo et al. PRB 86, 165114 (2012)] that could lead to a large thermoelectric figure of merit (ZT). We investigate the suitability of lanthanum nickelate as a candidate material for high-ZT devices through a systematic study of oxygenated thin films grown by pulsed laser deposition. We report the electrical conductivity, Seebeck coefficient, and structural morphology of La2NiO4 grown in a range of oxidizing atmospheres and discuss their implications for controlled engineering of thermoelectric properties. 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 Innovación (Spain), grant MAT2010-16157, and the European Research Council, grant ERC-2010-StG 259082 2D THERMS.

  8. 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.

  9. 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).

  10. Classification and management of bile duct injuries.

    PubMed

    Mercado, Miguel Angel; Domínguez, Ismael

    2011-04-27

    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.

  11. The presence and accuracy of food and nutrition terms in the Spanish and English editions of Wikipedia: in comparison with the Mini Larousse encyclopaedia.

    PubMed

    Cabrera-Hernández, Laura María; Wanden-Berghe, Carmina; Curbelo Castro, Celeste; Sanz-Valero, Javier

    2014-10-02

    Objetivos: Determinar la presencia y adecuación de la terminología sobre las ciencias de la alimentación/nutrición en las ediciones española e inglesa de la Wikipedia, comparándola con una enciclopedia de ámbito general (Mini Larousse). Métodos: Los términos a estudio se obtuvieron del Diccionario LID sobre metabolismo y nutrición. Se comprobó la existencia y adecuación de los términos seleccionados a partir del cálculo muestral aleatorio sin reposición (n = 386), accediendo a las ediciones española e inglesa de la Wikipedia. Resultados: De la muestra a estudio (n=386) se determinó la existencia de 261 términos en la edición española y 306 en la inglesa. Existiendo diferencias entre las dos ediciones (p.

  12. 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

  13. 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.

  14. 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.

  15. 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.

  16. 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. PMID:23894978

  17. 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

  18. A new genus and species of opisthogonimid (Digenea) of Liophis anomalus (Serpentes: Colubridae) from Uruguay.

    PubMed

    Volonterio, Odile; Baletta, Silvana; Meneghel, Melitta

    2006-10-01

    During a study on the helminth fauna of Liophis anomalus specimens deposited in the Reptile Collection of the Secci6n Zoología Vertebrados, Facultad de Ciencias, Uruguay, a new genus of Opisthogoniminae was found. Paracotyletrema n. gen. is described from the buccal cavity and esophagus of specimens from Departamento de Flores, Uruguay. This new genus differs from the other 2 Opisthogoniminae, Opisthogonimus and Westella, by having much smaller body size; maximum width at level of posterior end of oral sucker; oral sucker length more than one-fourth of body length; oral sucker and acetabulum separated by a distance of about the diameter of pharynx; cirrus pouch length more than half of body length; and testes in completely coincident zones. The type and only species, Paracotyletrema poncedeleoni n. gen., n. sp., is defined by the following diagnostic characters: mean oral sucker length one-third to one-half of body length; cirrus pouch of about body length, contorted, mainly acetabular; large, round testes in nearly adjacent fields, and an ovary nearly adjacent to right testis. Besides the type locality, Paracotyletrema poncedeleoni has been found in L. anomalus specimens from the Departamentos of Artigas and Treinta y Tres; therefore, it has a widespread distribution in Uruguay.

  19. [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.

  20. 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

  1. 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.

  2. "Family planning and population programs" a book review article.

    PubMed

    Hauser, P M

    1967-03-01

    RESUMEN: El volumen Planeamiento Familiar y Programas de Poblacion es un libro indispensable tanto para demógrafos como para otras personas interesadas en el control de población. Tiene sus limitaciones dodo su caracter heterogéneo, su falta de autocrítica, el no tratar sobre la validez y confiabilidad de las encuestas de conocimientos, attitudes y prácticas (KAP), su injustificado tono optimista, y su fracaso al no explorar y considerar alternativas para las presunciones y premisas sobre las cuales se basan los actuates programas de planeamiento familiar. Es sin embargo un importante hito que resume las contribuciones de las ciencias sociales y biomédicas al campo de la demografía.SummaryThe volume Family Planning and Population Programs is an indispensable book to demographers as well as to others concerned with population control. It is not without limitations because of its heterogeneous character, its lack of self-criticism, its failure to deal with the reliability and validity of KAP surveys, its unwarranted optimistic aura, and its failure to explore and consider alternatives to the basic assumptions and premises on which present family planning programs are based. It is, nevertheless, a landmark in its summarization of the contribution of the social and biomedical sciences to demographic engineering.

  3. Soap, A Free-code Tool To Study The Impact Of Stellar Activity

    NASA Astrophysics Data System (ADS)

    Boisse, Isabelle; Bonfils, X.; Santos, N.

    2011-09-01

    Dark spots and bright plages are present on the surface of all stars, even low-active stars (like the Sun in its low-active phase). Their appearance and disappearance on the stellar photosphere, combined with the stellar rotation, may lead to errors and uncertainties in the characterization of planets both in radial velocimetry and photometry. SOAP is a tool offered to the community (Boisse, Bonfils and Santos, in prep.) that enables to simulate spots and plages on rotating stars and computes their impact on RV and photometric measurements. This talk will discuss the challenges related to the knowledge of stellar activity for the next decade: detect telluric planets in the habitable zone of their stars (from G to M dwarfs), understand the activity in the low-mass end of M dwarf (on which will focus future projects like Elektra, SPIRou or CARMENES), limitation to the sum of different transit observations in order to characterize the atmospheric components (from the ground or with Spitzer, JWST), planets around young stars,... and how this can be simulated with SOAP in order to search for indices and corrections. IB and NCS would like to thank the support by the European Research Council/European Community under the FP7 through a Starting Grant, as well from Fundacao para a Ciencia e a Tecnologia (FCT), Portugal.

  4. [Santiago Ramón y Cajal and Ivan Petrovich Pavlov: does complementarity exist between their theories?].

    PubMed

    Rozo, Jairo A; Rodríguez-Moreno, Antonio

    2015-08-01

    Introduccion. Pocos autores han comparado la vida y obra de Cajal y Pavlov, y, cuando lo hacen, se refieren generalmente a su coincidencia en el XIV Congreso Internacional de Medicina que tuvo lugar en Madrid en 1903. Objetivo. Presentar los modelos teoricos de ambos autores para estudiar la posible complementariedad entre sus teorias. Desarrollo. Se presentan las principales caracteristicas de la teoria neuronal de Cajal, la teoria reticular que le antecedio, los principales resultados de las investigaciones de Cajal y las aportaciones que brindo al concepto de plasticidad. En cuanto a la teoria de los reflejos condicionales de Pavlov, se describen sus principales postulados, las leyes pavlovianas y la tipologia del sistema nervioso segun Pavlov. Conclusiones. Los niveles de organizacion en los que trabajan Cajal y Pavlov se pueden entender como complementarios si tenemos en cuenta la propuesta de Henry Wallon o las de marcos epistemologicos como la epistemologia estrategica, donde el avance de la ciencia se logra desde estrategias diferentes, pero complementarias, que ayudan a construir modelos teoricos mas fuertes.

  5. "Family planning and population programs" a book review article.

    PubMed

    Hauser, P M

    1967-03-01

    RESUMEN: El volumen Planeamiento Familiar y Programas de Poblacion es un libro indispensable tanto para demógrafos como para otras personas interesadas en el control de población. Tiene sus limitaciones dodo su caracter heterogéneo, su falta de autocrítica, el no tratar sobre la validez y confiabilidad de las encuestas de conocimientos, attitudes y prácticas (KAP), su injustificado tono optimista, y su fracaso al no explorar y considerar alternativas para las presunciones y premisas sobre las cuales se basan los actuates programas de planeamiento familiar. Es sin embargo un importante hito que resume las contribuciones de las ciencias sociales y biomédicas al campo de la demografía.SummaryThe volume Family Planning and Population Programs is an indispensable book to demographers as well as to others concerned with population control. It is not without limitations because of its heterogeneous character, its lack of self-criticism, its failure to deal with the reliability and validity of KAP surveys, its unwarranted optimistic aura, and its failure to explore and consider alternatives to the basic assumptions and premises on which present family planning programs are based. It is, nevertheless, a landmark in its summarization of the contribution of the social and biomedical sciences to demographic engineering. PMID:21279790

  6. Strain-Induced Pseudo--Magnetic Fields in Graphene: MegaGauss in Nanobubbles

    NASA Astrophysics Data System (ADS)

    Levy, Niv

    2011-03-01

    Recent theoretical proposals suggest that strain can be used to modify graphene electronic states through the creation of a pseudo--magnetic field. This effect is unique to graphene because of its massless Dirac fermion-like band structure and particular lattice symmetry (C3v). Scanning tunneling microscopy shows that graphene grown on a platinum (111) surface forms nanobubbles, which are highly strained due to thermal expansion mismatch between the film and the substrate. We find that scanning tunneling spectroscopy measurements of these nanobubbles exhibit Landau levels that form in the presence of strain-induced pseudo--magnetic fields greater than 300 Tesla. This demonstration of enormous pseudo--magnetic fields opens the door to both the study of charge carriers in previously inaccessible high magnetic field regimes and deliberate mechanical control over electronic structure in graphene or so-called ``strain engineering''. In collaboration with S. A. Burke ,2 , K. L. Meaker 2 , M. Panlasigui 2 , A. Zettl 2,3 , F. Guinea 4 , A. H. Castro Neto 5 and M. F. Crommie 2,3 . 1. Present address: Department of Physics and Astronomy and Department of Chemistry, University of British Columbia, Vancouver, BC V6T 121, Canada. 2. Department of Physics, University of California, Berkeley, CA 94720, USA. 3. Materials Science Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA. 4. Instituto de Ciencia de Materiales de Madrid (CSIC), Madrid 28049, Spain. 5. Department of Physics, Boston University, Boston, MA 02215, USA.

  7. Influence of voxel size settings in X-Ray CT Imagery of soil in scaling properties

    NASA Astrophysics Data System (ADS)

    Heck, R.; Scaiff, N. T.; Andina, D.; Tarquis, A. M.

    2012-04-01

    Fundamental to the interpretation and comparison of X-ray CT imagery of soil is recognition of the objectivity and consistency of procedures used to generate the 3D models. Notably, there has been a lack of consistency in the size of voxels used for diverse interpretations of soils features and processes; in part, this is due to the ongoing evolution of instrumentation and computerized image processing capacity. Moreover, there is still need for discussion on whether standard voxels sizes should be recommended, and what those would be. Regardless of any eventual adoption of such standards, there is a need to also consider the manner in which voxel size is set in the 3D imagery. In the typical approaches to X-ray CT imaging, voxel size may be set at three stages: image acquisition (involving the position of the sample relative to the tube and detector), image reconstruction (where binning of pixels in the acquired images may occur), as well as post-reconstruction re-sampling (which may involve algorithms such as tri-cubic convolution). This research evaluates and compares the spatial distribution of intra-aggregate voids in 3D imagery as well as their scaling properties, of equivalent voxel size, generated using various combinations of the afore-mentioned approaches. Funding provided by Spanish Ministerio de Ciencia e Innovación (MICINN) through project no. AGL2010-21501/AGR is greatly appreciated.

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

    PubMed

    Rivera, Julio

    2014-01-01

    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). PMID:24870866

  9. 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.

  10. 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.

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

    PubMed Central

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

    2016-01-01

    Abstract Background 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. New information 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. PMID:27660526

  12. [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. PMID:24152394

  13. 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.

  14. 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.

  15. 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.

  16. 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.

  17. 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.

  18. Three-dimensional structure of a confined swirling jet at moderately large Reynolds numbers.

    NASA Astrophysics Data System (ADS)

    Sanmiguel-Rojas, Enrique; Burgos, M. A.; Del Pino, Carlos; Fernandez-Feria, Ramon

    2006-11-01

    We have performed a series of three-dimensional (3D) numerical simulations of the incompressible flow discharging from a rotating pipe into a co-axial cylindrical container through a sudden expansion. We have considered several values of the Reynolds number based on the pipe flow rate, ReQ, between 100 and 400, and an expansion ratio of 8, and have analyzed the emerging 3D flow structures in the swirling jet exiting from the rotating pipe as the swirl Reynolds number Reθ, based on the circumferential velocity of the discharging pipe, is increased. The results are compared with axisymmetric (2D) numerical simulations of the same problem. Three-dimensional, non-linear instabilities are found in the swirling jet above a critical value of Reθ, which depends on ReQ, that obviously do not appear in the axisymmetric simulations. These non-linear instabilities are triggered by the linear instabilities inside the rotating pipe. We characterize the azimuthal wave number, frequency and other properties of these instabilities as Reθ is increased. There exists another critical value of Reθ above which 3D (helical) vortex breakdown appears in the swirling jet. But this critical value and the structure of the vortex breakdown flow are both substantially different from the axisymmetric counterparts. *Supported by the Ministerio de Educacion y Ciencia of Spain (FIS04-00538).

  19. ArctiQuest: A Case Study in Sustainability for Education & Public Outreach Projects

    NASA Astrophysics Data System (ADS)

    Shope, R.

    2009-12-01

    ArctiQuest: Enter the Cryosphere, Exploring Ice in the Solar System, is an official International Polar Year (IPY) Education & Public Outreach (EPO) activity for urban youth made possible by support from NASA’s Science Mission Directorate, Earth Science Division. The presenter, Richard Shope, is the Principal Investigator. ArctiQuest leveraged the NASA curriculum authored by Shope, entitled Exploring Ice in the Solar System, to build an international program (U.S. & Mexico) utilizing an urban science enterprise model. The model depends on cultivating relationships with community organizations (governmental, educational, youth employment, as well as non-profit, nongovernmental organizations) to develop creativity and talent within the arena of science and advanced technologies. Through the COUNCIL TO ADVANCE URBAN SCIENCE ENTERPRISE (CAUSE), Shope has established the Urban Science Corps in Los Angeles, Baltimore, New Yok, and Chicago, and La Ciencia A Tu Alcance (Science You Can Reach) in Mexico and Puerto Rico. These projects carry out the NASA ArctiQuest project by providing job slots for undergraduate interships and high school-age apprenticeships as INQUIRY COACHES.

  20. 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.

  1. 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.

  2. 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.

  3. 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.

  4. Astrometric Calibration of the Gemini NICI Planet-Finding Campaign

    NASA Astrophysics Data System (ADS)

    Hayward, Thomas L.; Biller, Beth A.; Liu, Michael C.; Nielsen, Eric L.; Wahhaj, Zahed; Chun, Mark; Ftaclas, Christ; Hartung, Markus; Toomey, Douglas W.

    2014-12-01

    We describe the astrometric calibration of the Gemini NICI Planet-Finding Campaign. The Campaign requires a relative astrometric accuracy of ≈20 mas across multiyear timescales in order to distinguish true companions from background stars by verifying common proper motion and parallax with their parent stars. The calibration consists of a correction for instrumental optical image distortion, plus on-sky imaging of astrometric fields to determine the pixel scale and image orientation. We achieve an accuracy of lsim7 mas between the center and edge of the 18'' NICI field, meeting the 20 mas requirement. Most of the Campaign data in the Gemini Science Archive are accurate to this level but we identify a number of anomalies and present methods to correct the errors. 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), the Australian Research Council (Australia), Ministério da Ciência, Tecnologia e Inovação (Brazil), and Ministerio de Ciencia, Tecnología e Innovación Productiva (Argentina).

  5. 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).

  6. 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.

  7. 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.

  8. 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.

  9. A new reference collection of documented human skeletons from Mérida, Yucatan, Mexico.

    PubMed

    Chi-Keb, J R; Albertos-González, V M; Ortega-Muñoz, A; Tiesler, V G

    2013-10-01

    This report documents the history and composition of a new reference collection currently composed of 84 identified human skeletons from the modern cemetery of Xoclán in Mérida, Yucatan, Mexico. The skeletal sample is the first of its kind in the Yucatan peninsula, a region with a population short of two million mostly local and non-local Mexican residents and descendants of the ancient Maya. The growing collection is curated at the Facultad de Ciencias Antropológicas (School of Anthropological Sciences) of the Autonomous University of Yucatan. Here we describe recovery procedures, preservation, background information and validation measures of the individuals who make up the collection. Detailed information on the generational pattern, sex, and age distribution, along with socioeconomic context and provenance of the skeletons are provided. The majority of the skeletal series is represented by males and by older individuals of both sexes. Almost all of these individuals come from Mérida's middle and lower socioeconomic sectors and died within the urban city boundaries. Biographic information was collected on each individual at the municipal civil registry and confronted with information of national and municipal censuses (2000 and 2005), to be validated and to be discussed here in terms of the representativeness of the reference series and its potential uses in forensic, anthropological and medical research.

  10. Origin of Dynamical Quantum Non-locality

    NASA Astrophysics Data System (ADS)

    Pachon, Cesar E.; Pachon, Leonardo A.

    2014-03-01

    Non-locality is one of the hallmarks of quantum mechanics and is responsible for paradigmatic features such as entanglement and the Aharonov-Bohm effect. Non-locality comes in two ``flavours'': a kinematic non-locality- arising from the structure of the Hilbert space- and a dynamical non-locality- arising from the quantum equations of motion-. Kinematic non-locality is unable to induce any change in the probability distributions, so that the ``action-at-a-distance'' cannot manifest. Conversely, dynamical non-locality does create explicit changes in probability, though in a ``causality-preserving'' manner. The origin of non-locality of quantum measurements and its relations to the fundamental postulates of quantum mechanics, such as the uncertainty principle, have been only recently elucidated. Here we trace the origin of dynamical non-locality to the superposition principle. This relation allows us to establish and identify how the uncertainty and the superposition principles determine the non-local character of the outcome of a quantum measurement. Being based on group theoretical and path integral formulations, our formulation admits immediate generalizations and extensions to to, e.g., quantum field theory. This work was supported by the Departamento Administrativo de Ciencia, Tecnologia e Innovacion -COLCIENCIAS- of Colombia under the grant number 111556934912.

  11. Magnon drag thermopile

    NASA Astrophysics Data System (ADS)

    Valenzuela, Sergio O.

    2013-03-01

    Thermoelectric effects in spintronics are gathering increasing attention as a means of controlling spin information by using heat flow. Thermal magnons (spin-wave quanta) are expected to play a major role, however, the coupling between electrons and magnons in ferromagnetic metals remains poorly understood. We demonstrate a conceptually new device that enables us to gather information on magnon-electron scattering and magnon-drag effects. The device resembles a thermopile formed by a large number of pairs of ferromagnetic wires placed between a hot and a cold source and connected thermally in parallel and electrically in series. By controlling the relative orientation of the magnetization in pairs of wires, the magnon drag can be studied independently of the electron and phonon drag thermoelectric effects. Measurements as a function of temperature reveal the effect on magnon drag following a variation of magnon and phonon populations. These results demonstrate the feasibility of directly converting magnon dynamics of nanomagnets into an electrical signal and could pave the way to novel thermoelectric devices for energy harvesting. This research was supported by the Spanish Ministerio de Ciencia e Innovación, MICINN (MAT2010-18065) and by the European Community's Seventh Framework Programme (FP7/2007-2013) under grant agreement NANOFUNCTION no 257375.

  12. Soil surface roughness and porosity under different tillage systems

    NASA Astrophysics Data System (ADS)

    Rodriguez-Gonzalez, J.; Saa-Requejo, A.; Gómez, J. A.; Valencia, J. L.; Zarco, P.; Tarquis, A. M.

    2012-04-01

    Both soil porosity and surface elevation can be altered by tillage operation. Even though the surface porosity is an important parameter of a tilled field, however, no practical technique for rapid and non-contact measurement of surface porosity has been developed yet. On the contrary, the surface elevation of tilled soil can be quickly determined with a laser profiler. Working under the assumption that the surface elevation of a tilled field is a complicated superposition of the soil terrain profile at a larger-scale and the roughness at a fine-scale, this study included three aspects: (i) to establish an index (Roughness Index, RI) at a fine-scale to associate the surface roughness with porosity; (ii) to examine the correlation between surface porosity and the proposed RI by three types of tillage treatment in the field; and (iii) to check the scaling/multiscaling behavior among different grid sizes of calculating RI on predicting surface porosity. Consequently, the statistical results from each tilled plot show a strong correlation between the surface porosity and the defined RI in an early stage (ca. 2 days) after tillage. Acknowledgements Funding provided by CEIGRAM (Research Centre for the Management of Agricultural and Environmental Risks)and Spanish Ministerio de Ciencia e Innovación (MICINN) through project AGL2010-21501/AGR is greatly appreciated.

  13. Critical quasienergy states in driven many-body systems

    NASA Astrophysics Data System (ADS)

    Bastidas Valencia, Victor Manuel; Engelhardt, Georg; Perez-Fernandez, Pedro; Vogl, Malte; Brandes, Tobias

    2015-03-01

    A quantum phase transition (QPT) is characterized by non-analyticities of ground-state properties at the critical points. Recently it has been shown that quantum criticality emerges also in excited states of the system, which is referred to as an excited-state quantum phase transition (ESQPT). This kind of quantum criticality is intimately related to a level clustering at critical energies, which results in a logarithmic singularity in the density of states. Most of the previous studies on quantum criticality in excited states have been focused on time independent systems. Here we study spectral singularities that appear in periodically-driven many-body systems and show how the external control allows one to engineer geometrical features of the quasienergy landscape. In particular, we study singularities in the quasienergy spectrum of a fully-connected network consisting of two-level systems with time-dependent interactions. We discuss the characteristic signatures of these singularities in observables like the magnetization, which should be measurable with current technology. The authors gratefully acknowledge financial support by the DFG via grants BRA 1528/7, BRA 1528/8, SFB 910 (V.M.B., T.B.), the Spanish Ministerio de Ciencia e Innovacion (Grants No. FIS2011-28738-C02-01) and Junta de Andalucia (Grants No. FQM160).

  14. Experimental study of the lift and drag characteristics of a cascade of flat plates in a configuration of interest for tidal energy converters

    NASA Astrophysics Data System (ADS)

    Fedoul, Faical; Parras, Luis; Del Pino, Carlos; Fernandez-Feria, Ramon

    2012-11-01

    Wind tunnel experiments are conducted for the flow around both a single flat plate and a cascade of three parallel flat plates at different angles of incidence to compare their lift and drag coefficients in a range of Reynolds number about 105, and for two values of the aspect ratio of the flat plates. The selected cascade configuration is of interest for a particular type of tidal energy converter. The lift and drag characteristics of the central plate in the cascade are compared to those of the isolated plate, finding that there exist an angle of incidence, which depends on the Reynolds number and the aspect ratio, above which the effective lift of the plate in the cascade becomes larger than that of an isolated plate. These experimental results, which are also analyzed in the light of theoretical predictions, are used as a guide for the design of the optimum configuration of the cascade which extracts the maximum power from a tidal current for a given value of the Reynolds number. Supported by the Ministerio de Ciencia e Innovacion (Spain) Grant no. ENE2010-16851.

  15. Speckle Camera Imaging of the Planet Pluto

    NASA Astrophysics Data System (ADS)

    Howell, Steve B.; Horch, Elliott P.; Everett, Mark E.; Ciardi, David R.

    2012-10-01

    We have obtained optical wavelength (692 nm and 880 nm) speckle imaging of the planet Pluto and its largest moon Charon. Using our DSSI speckle camera attached to the Gemini North 8 m telescope, we collected high resolution imaging with an angular resolution of ~20 mas, a value at the Gemini-N telescope diffraction limit. We have produced for this binary system the first speckle reconstructed images, from which we can measure not only the orbital separation and position angle for Charon, but also the diameters of the two bodies. Our measurements of these parameters agree, within the uncertainties, with the current best values for Pluto and Charon. The Gemini-N speckle observations of Pluto are presented to illustrate the capabilities of our instrument and the robust production of high accuracy, high spatial resolution reconstructed images. We hope our results will suggest additional applications of high resolution speckle imaging for other objects within our solar system and beyond. 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 National Science Foundation 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, Tecnologia e Inovação (Brazil) and Ministerio de Ciencia, Tecnología e Innovación Productiva (Argentina).

  16. Easier Phase IIs: Recent Improvements to the Gemini User Tools

    NASA Astrophysics Data System (ADS)

    Miller, Bryan; Nuñez, A.

    2013-01-01

    During 2011 and 2012 Gemini Observatory undertook a significant project to improve the software tools used by investigators to propose for and prepare observations. The main goal was to make the definition of observation details (the Phase II process) easier and faster. The main initiatives included rewriting the observing proposal tool (Phase I Tool) and making several major improvements to the Observing Tool, including automatic settings for arc and flat exposures, automatic guide star selection for all instruments and wavefront sensors, and more complete initial template observations with capabilities for simultaneous editing of many observations. This poster explains these major changes as well as outlines future development plans. The Gemini Observatory 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, Tecnologia e Inovação (Brazil), and Ministerio de Ciencia, Tecnología e Innovación Productiva (Argentina).

  17. Interface-mediated intervalley coupling in Si

    NASA Astrophysics Data System (ADS)

    Koiller, Belita; Saraiva, A. L.; Calderon, M. J.; Hu, Xuedong; Das Sarma, S.

    2011-03-01

    The conduction band degeneracy in Si is detrimental to spin qubits, for which a nondegenerate ground orbital state is desirable. The Si valley degeneracy is reduced to 2 near an interface with an insulator, and it may be lifted by the spatially abrupt change in the crystal potential. Basic physical mechanisms for Si/barrier mediated valley coupling in different situations are addressed here. Theoretical studies of the interface-induced valley splitting in Si are presented. Abrupt and smooth interface profiles are considered, and the full plane wave expansions of the Bloch functions at the conduction band minima are included. Simple criteria are suggested for optimal fabrication parameters affecting the valley splitting, emphasizing the relevance of different interface-related properties. Refs: A.L.Saraiva et al, PRB 80, 081305 R (2009); arXiv:1006.3338 Support: BK and ALS thank CNPq, FUJB, INCT on Quantum Information, and FAPERJ. M.J.C. acknowledges Ministerio de Ciencia e Innovación (Spain). XH amd SDS thank NSA and L PS. S.D.S. also thanks CMTC.

  18. Soil Surface Roughness through Image Analysis

    NASA Astrophysics Data System (ADS)

    Tarquis, A. M.; Saa-Requejo, A.; Valencia, J. L.; Moratiel, R.; Paz-Gonzalez, A.; Agro-Environmental Modeling

    2011-12-01

    Soil erosion is a complex phenomenon involving the detachment and transport of soil particles, storage and runoff of rainwater, and infiltration. The relative magnitude and importance of these processes depends on several factors being one of them surface micro-topography, usually quantified trough soil surface roughness (SSR). SSR greatly affects surface sealing and runoff generation, yet little information is available about the effect of roughness on the spatial distribution of runoff and on flow concentration. The methods commonly used to measure SSR involve measuring point elevation using a pin roughness meter or laser, both of which are labor intensive and expensive. Lately a simple and inexpensive technique based on percentage of shadow in soil surface image has been developed to determine SSR in the field in order to obtain measurement for wide spread application. One of the first steps in this technique is image de-noising and thresholding to estimate the percentage of black pixels in the studied area. In this work, a series of soil surface images have been analyzed applying several de-noising wavelet analysis and thresholding algorithms to study the variation in percentage of shadows and the shadows size distribution. Funding provided by Spanish Ministerio de Ciencia e Innovación (MICINN) through project no. AGL2010- 21501/AGR and by Xunta de Galicia through project no INCITE08PXIB1621 are greatly appreciated.

  19. Attosecond Electro-Magnetic Forces Acting on Metal Nanospheres Induced By Relativistic Electrons

    NASA Astrophysics Data System (ADS)

    Lagos, M. J.; Batson, P. E.; Reyes-Coronado, A.; Echenique, P. M.; Aizpurua, J.

    2014-03-01

    Swift electron scattering near nanoscale materials provides information about light-matter behavior, including induced forces. We calculate time-dependent electromagnetic forces acting on 1-1.5 nm metal nanospheres induced by passing swift electrons, finding both impulse-like and oscillatory response forces. Initially, impulse-like forces are generated by a competition between attractive electric forces and repulsive magnetic forces, lasting a few attoseconds (5-10 as). Oscillatory, plasmonic response forces take place later in time, last a few femtoseconds (1- 5 fs), and apparently rely on photon emission by decay of the electron-induced surface plasmons. A comparison of the strength of these two forces suggests that the impulse-like behavior dominates the process, and can transfer significant linear momentum to the sphere. Our results advance understanding of the physics behind the observation of both attractive and repulsive behavior of gold nano-particles induced by electron beams in aberration-corrected electron microscopy. Work supported under DOE, Award # DE-SC0005132, Basque Gov. project ETORTEK inano, Spanish Ministerio de Ciencia e Innovacion, No. FIS2010-19609-C02-01.

  20. Modelling Positron Interactions with Matter

    NASA Astrophysics Data System (ADS)

    Garcia, G.; Petrovic, Z.; White, R.; Buckman, S.

    2011-05-01

    In this work we link fundamental measurements of positron interactions with biomolecules, with the development of computer codes for positron transport and track structure calculations. We model positron transport in a medium from a knowledge of the fundamental scattering cross section for the atoms and molecules comprising the medium, combined with a transport analysis based on statistical mechanics and Monte-Carlo techniques. The accurate knowledge of the scattering is most important at low energies, a few tens of electron volts or less. The ultimate goal of this work is to do this in soft condensed matter, with a view to ultimately developing a dosimetry model for Positron Emission Tomography (PET). The high-energy positrons first emitted by a radionuclide in PET may well be described by standard formulas for energy loss of charged particles in matter, but it is incorrect to extrapolate these formulas to low energies. Likewise, using electron cross-sections to model positron transport at these low energies has been shown to be in serious error due to the effects of positronium formation. Work was supported by the Australian Research Council, the Serbian Government, and the Ministerio de Ciencia e Innovación, Spain.

  1. 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.

  2. Realistic retrospective dose assessments to members of the public around Spanish nuclear facilities.

    PubMed

    Jiménez, M A; Martín-Valdepeñas, J M; García-Talavera, M; Martín-Matarranz, J L; Salas, M R; Serrano, J I; Ramos, L M

    2011-11-01

    In the frame of an epidemiological study carried out in the influence areas around the Spanish nuclear facilities (ISCIII-CSN, 2009. Epidemiological Study of The Possible Effect of Ionizing Radiations Deriving from The Operation of Spanish Nuclear Fuel Cycle Facilities on The Health of The Population Living in Their Vicinity. Final report December 2009. Ministerio de Ciencia e Innovación, Instituto de Salud Carlos III, Consejo de Seguridad Nuclear. Madrid. Available from: http://www.csn.es/images/stories/actualidad_datos/especiales/epidemiologico/epidemiological_study.pdf), annual effective doses to public have been assessed by the Spanish Nuclear Safety Council (CSN) for over 45 years using a retrospective realistic-dose methodology. These values are compared with data from natural radiation exposure. For the affected population, natural radiation effective doses are in average 2300 times higher than effective doses due to the operation of nuclear installations (nuclear power stations and fuel cycle facilities). When considering the impact on the whole Spanish population, effective doses attributable to nuclear facilities represent in average 3.5×10(-5)mSv/y, in contrast to 1.6mSv/y from natural radiation or 1.3mSv/y from medical exposures.

  3. 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

  4. 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

  5. They teach it more successfully

    NASA Astrophysics Data System (ADS)

    Reyes Ruiz-Gallardo, Jose; Valdés, Arturo; Castaño, Santiago

    2010-05-01

    peers (Johnson et al, 1981, Cuseo, 1996, Shachar and Fischer, 2004). It is also related with the increasing of self-esteem (Lawrence, 1996), achieved in environments rich in challenges and low in threat (Abbot and Moylett, 1999). References: Abbot, L. and Moylet, H, 1999. Early education transformed. London: Falmer press. Pp: 214. Bernal, J. M., García-Estañ, R. y Guzman, D. (2005). Las actividades de enseñanza en la Educación Primaria. En: Didáctica de las Ciencias Experimentales I. Sánchez, G. (Coord.). Pp.: 211-322. CUSE (Committee on Undergraduate Science Education), (1997). Science Teaching Reconsidered. A handbook. Washington D. C.: National Academy Press. Cuseo, JB, 1996. Cooperative Learning: A Pedagogy for Addressing Contemporary Challanges & Critical Issues in Higher Education. Marymount college, New Forums Press. Johnson, D., Maruyama, G., Johnson, R., Nelson, C., & Skon, L. (1981) The effects of cooperative, competitive and individualistic goal structures on achievement. A meta-analysis. Psychological Bulletin, 89(1), 47-62. Lawrence, D, 1996. Enhacing Self Esteem in classroom. Paul Chapman Publishing Ltd, London. Pp 224. Lederman, N and Abd-El-Khalick, F (1998): Avoiding De-Natured Science: Activities that Promote Understandings of the Nature of Science In: W. F. McComas (Ed.). The Nature of Science in Science Education. Rationales and Strategies. (83-126). The Netherlands: Kluwer Academic. Pp. 388. McDermott, L. C. (1990). A perspective on teacher preparation in physics and other sciences: the need for special science courses for teachers. American Journal of Physics, 58(8):734-742. Pujol, R.M. (2003). Didáctica de las ciencias en la educación primaria. Madrid: Síntesis. Shachar, H and Fischer, S., 2004. Cooperative learning and the achievement of motivatioin and perceptions of students in 11th grade chemistry classes. Learning and Instruction, 14: 69-87.

  6. 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).

  7. 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.

  8. 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

  9. 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:

  10. Las situaciones problemáticas relevantes que llevaron a la construcción de los conocimientos,
  11. las dificultades de todo tipo con las que hubo que enfrentarse y, muy en particular,
  12. la necesidad de superar las "evidencias de sentido común" que establecían una supuesta barrera infranqueable entre la Tierray los Cielos y que obstaculizaron durante siglos el desarrollo científico.
  13. En este trabajo presentamos un programa de actividades para el estudio de la gravitación en la secundaria superior, orientado a favorecer la participación de los estudiantes, en alguna medida, en la reconstrucción de este proceso que constituyó la denominada primera gran revolución científica y asomándonos al estudio de una de las ciencias más antiguas, la Astronomía, que hoy sigue despertando gran interés. O estudo da gravitação constitui uma ocasião excepcional para mostrar a ciência e a tecnologia em toda sua riqueza e

  14. 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

  15. PREFACE: Particles and Fields: Classical and Quantum

    NASA Astrophysics Data System (ADS)

    Asorey, M.; Clemente-Gallardo, J.; Marmo, G.

    2007-07-01

    This volume contains some of the contributions to the Conference Particles and Fields: Classical and Quantum, which was held at Jaca (Spain) in September 2006 to honour George Sudarshan on his 75th birthday. Former and current students, associates and friends came to Jaca to share a few wonderful days with George and his family and to present some contributions of their present work as influenced by George's impressive achievements. This book summarizes those scientific contributions which are presented as a modest homage to the master, collaborator and friend. At the social ceremonies various speakers were able to recall instances of his life-long activity in India, the United States and Europe, adding colourful remarks on the friendly and intense atmosphere which surrounded those collaborations, some of which continued for several decades. This meeting would not have been possible without the financial support of several institutions. We are deeply indebted to Universidad de Zaragoza, Ministerio de Educación y Ciencia de España (CICYT), Departamento de Ciencia, Tecnología y Universidad del Gobierno de Aragón, Universitá di Napoli 'Federico II' and Istituto Nazionale di Fisica Nucleare. Finally, we would like to thank the participants, and particularly George's family, for their contribution to the wonderful atmosphere achieved during the Conference. We would like also to acknowledge the authors of the papers collected in the present volume, the members of the Scientific Committee for their guidance and support and the referees for their generous work. M Asorey, J Clemente-Gallardo and G Marmo The Local Organizing Committee George Sudarshan George Sudarshan

    International Advisory Committee

    A. Ashtekhar (Pennsylvania State University, USA)
    L. J. Boya (Universidad de Zaragoza, Spain)
    I. Cirac (Max Planck Institute, Garching

  16. 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

  17. Forest Resources, Chiefdoms and Mortuary Practices in the Neotropics: Preliminary Archaeobotanical Analysis from El Caño Funerary Complex (Coclé Province, Panamá)

    NASA Astrophysics Data System (ADS)

    Martín Seijo, M.; Torné, J. Mayo; Torné, C. Mayo; Huerta, R. Piqué i.

    2012-04-01

    El Caño site is situated on the Pacific side of Panamá, near the Río Grande. It's a funerary complex comprising different types of structures (stone structures -basalt columns, groups of sculptures and a causeway-; earthen mounds and canals; burials). The excavations supervised by Julia Mayo between 2008 and 2011 allowed to discover several lavish burials estimated to date between 700 and 1000 AD (Mayo & Mayo 2012). The data recovered has served as source of information for the pre-Columbian chiefdoms and their mortuary practices. There was carried out a detailed taphonomic study to register the complex formation processes of these burial deposits, and the significant post-depositional transformations (anthropogenic and natural processes) (Mayo & Mayo in press). Also during the excavations were recovered archaeobotanical samples; most of them charcoals. The laboratory work process consisted in the exhaustive description of the anatomical features of the different taxa identified during the charcoal analyses (the identification level varied from species to family, although in several case we couldn't propose any taxa). These samples were concentrated in structures, and in few cases dispersed in the sediment. Some of the samples analyzed were large pieces of charcoal of the wooden beams from ancient wood structures, and other pieces of charcoal and vegetable fibers were related directly with the burial practices. The charcoal analysis results aim to contribute to the knowledge of the exploitation of forest resources, of the territories where these resources were collected, and of the production process (chaîne opératoire). These results were complemented with the exhaustive review of written sources (spanish chronicles), ethnobotanical studies and archaeological data of other sites in this area. Acknowledgements: This research was developed under El Caño Archaeological Project and was funded by SENACYT (Secretaría Nacional de Ciencia y Tecnología de Panamá).

  18. Magnetic Paleofield of Avanhandava H4 Chondrite's Matrix and Chondrules - Implications on Magnetic Fields in Early Solar System.

    NASA Astrophysics Data System (ADS)

    Kohout, T.; Pesonen, L. J.

    2005-12-01

    The Avanhandava (H4) fall occurred in 1952 in Brazil. A total of 9.33 kg had been preserved after the meteorite brake up during the impact [1]. The meteorite contains large (0.1 - 2.0 mm) chon-drules that have clearly delineated boundaries with matrix. This characteristic allows us to pick up oriented individual chondrules and study their magnetic properties. The chondrules of the Avanhandava meteorite show a low and randomly oriented NRM (10-2 - 10-1 mAm2/kg). In contrast the matrix is strongly (100 - 101 mAm2/kg) and uniformly magnet-ized [2]. Various methods for paleofield determination have been applied on matrix and individual chondrules in order to determine possi-ble magnetizing processes and paleofields in early solar systems.. The laboratory experiments reveal approximate paleofields for matrix similar to present geomagnetic field. The paleofield de-termined for chondrules is approximately one order of magnitude lower comparing to values obtained for matrix. That suggests that chondrules are not magnetically contaminated by geomagnetic or artificial fields and they acquired their NRM prior their aggregation to Avanhandava parent body (random NRM directions). The matrix shows remarkable traces of terres-trial weathering and is uniformly magnetized. The paleofield re-sult for matrix indicates possible remagnetization caused by ter-restrial weathering. The terrestrial weathering of ordinary chon-drites is observed even on falls stored in museums and can sig-nificantly influence meteorite magnetic records [3, 4]. References: [1] Paar W. et al. 1976. Revista Brasileira de Geo-ciencias 6: 201-210. [2] Kohout T. and Pesonen L. J. 2005. 68th Annual Meteoritical Society Meeting: 5202. [3] Kohout T. et al. 2004. Physics and Chemistry of the Earth 29: 885-897. [4] Lee M. R. and Bland P. A. 2004. Geochimica et Cosmochimica Acta 68: 893-916.

  19. 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).

  20. [A new subspecies of Heraclides androgeus (Lepidoptera: Papilionidae) and its biogeographical aspects].

    PubMed

    Vargas-Fernández, Isabel; Luis-Martínez, Armando; Llorente-Bousquets, Jorge

    2013-06-01

    A new subspecies of Heraclides androgeus (Lepidoptera: Papilionidae) and its biogeographical aspects. Heraclides androgeus epidaurus was described and illustrated by Godman & Salvin in 1890 based on specimens obtained in Veracruz, indicating that their distribution encompassed both the Pacific and Atlantic sides of Mexico. Later authors commented that there were morphological differences between the male wings from both populations. We analyzed, described and nominated Heraclides androgeus reyesorum ssp. nov. Vargas, Llorente & Luis distributed in the Mexican Pacific coast, based on 62 specimens, and compared it with H a. epidaurus from the Gulf of Mexico, based on more than 200 specimens housed at UNAM: Museo de Zoología, Facultad de Ciencias and the Colección Nacional de Insectos of the Instituto de Biologia, as well as some collections from the USA. The main characters were the width of the yellow and black bands on forewings in males, which had a significant difference between the populations of both sides of Mexico, although some characters were variable and showed partial overlap. In the hindwings, the differences were the extent of the subterminal lunules in dorsal and ventral view. We also analyzed the male genitalia, finding notorious differences in both sclerotic processes of the harpe. Subspecific differences between females refer to the brightness and extent of green spots on the hindwings and the extent of lunules in the ventral view. The greatest abundance of H. a. reyesorum ssp. nov. was in the tropical deciduous forest, with gallery forest and in the lower range of the cloud forest, present at altitudes of 500-800 m and 1000-1 750 m, respectively. We discussed the pattern of endemism due to historical vicariant processes and explain the presence of the new subspecies of H. androgeus and other taxa of specific level.

  21. [Earth Sciences Research

    NASA Technical Reports Server (NTRS)

    2004-01-01

    contents include the following: 1. Argentina Field Expedition (2004). NASA funds supported joint fieldwork by Peter Makovicky (Dept. of Geology, TFM) and Sebastian Apesteguia (Museo Argentino de Ciencias Naturales, Buenos Aires) in a fossil-rich locality in the Cenomanian Candeleros Formation of northern Rio Negro Province, Argentina. The goal of this fieldwork was to collect small fossil vertebrates, which are abundant in this formation, with a special emphasis on small theropod (casmivorous) dinosaurs. 2. East Greenland Field Expedition (2004). During July-August 2004 the Field Museum led a month long expedition to Jameson Land in East Greenland to collect Triassic-Jurassic aged fossil plants from one of the most productive sites of this age in the world. The project aims include the study of events leading up to catastrophic changes in the biota and atmosphere that occurred about 200 million years ago. 3. Chile Field Expedition (March, 2004). Paleontological reconnaisance of the central Andean main range by helicopter: additional new Cenozoic mammal faunas from Chile. A several thousand sq km swath of the central Andean Cordillera was prospected by helicopter during 2004, permitting rapid survey of large areas in remote or difficult to access regions. This led to the recovery of fossils from several parts of the range, and the identification of sites worthy of future attention. 4. Wyoming Field Expedition (2004). NASA funds supported a three-week field program by Curator of Dinosaurs Peter Makovicky and a crew of Field Museum staff and volunteers at several sites in the Early Cretaceous Cloverly Formation of north-central Wyoming. The nine-member team excavated a number of sites that had been discovered over the preceding two summers.

  22. Follow the Mars Express launch from one of ESA's establishments

    NASA Astrophysics Data System (ADS)

    2003-05-01

    Europe’s first mission to the Red Planet will reach its target in December, after a six-month journey. Mars Express will help scientists answer questions about the Martian landscape, atmosphere and the origin of life that remain open, although a wealth of information is already available. Media representatives in Europe can follow the launch and initial orbital operations at ESA/Darmstadt (ESOC) in Germany, which will be acting as the main European press centre, or ESA/Noordwijk (ESTEC) in the Netherlands. ESA/Frascati (ESRIN) in Italy and the Italian Space Agency, ASI, are organising a joint event at the University of Rome. ESA/Villafranca (VILSPA) and the CDTI, the Spanish institution in charge of space issues, are organising a joint event in Spain at the Museo Principe Felipe de la Ciudad de las Artes y las Ciencias in Valencia. At each site ESA specialists will be available for interviews. Media representatives wishing to attend are requested to complete the attached reply form and fax it to the Communication Office at the establishment of their choice. The ESA TV Service will provide live televised coverage of the launch and initial orbital operations with English commentary, between 19:15 and 22:00 CEST. Satellite: Astra 2C at 19 degrees East Reception frequency: 10832 MHz Polarisation: Horizontal Symbol rate: 22 Msymb/s FEC: 5/6 Service ID: 61950 Service name: ESA TXT: none Details of the transmission schedule and satellite details for the various pre-launch Video News Releases can be found on http://television.esa.int. The launch can also be followed live on the internet at www.esa.int/marsexpresslaunch starting at 19:15 hrs. Here you can also find the launch diary, news, press releases, videos, images and more.

  23. Chile's dilemma: how to reinsert scientists trained abroad.

    PubMed

    Nunez-Parra, Alexia; Ramos, Maria-Paz

    2014-01-01

    Chile is recognized worldwide as an emergent economy, with a great power in natural resource exploitation. Nonetheless, despite being one of the most developed countries in Latin America, Chile imports most of the knowledge and technology necessary to drive innovation in the country. The tight budget that the Chilean government assigned to research and development and the absence of a long-term scientific agenda contributed to a limited supply of scientists over the years. In an effort to reverse this scenario, Chile has created several fellowships, such as the Becas Chile Program (BCP) to encourage new generations to pursue graduate studies to ultimately advance research and development in situ. More than 6000 fellows are now being trained abroad, accumulating an incredible potential to transform the Chilean scientific environment as we know it.  Chile now faces a greater challenge: it has to offer infrastructure and job openings to the highly skilled professionals in whom it invested. Unfortunately no clear public policies to address this situation have been developed, partially due to the lack of a dedicated institution, such as a Ministry for Science and Technology which could focalize the necessary efforts to promote such policies. Therefore, in the meantime, Chilean scientist have been motivated to create different organizations, such as, Mas Ciencia para Chile and Nexos Chile-USA, to promote constructive discussion of the policies that could be implemented to improve the Chilean scientific situation. We hope that these and other organizations have a real impact on the generation of scientific guidelines that will finally contribute to the development of the country. PMID:25309739

  24. The Light Curve Of The Dust Cloud Ejected By The Collision Between The Deep Impact Projectile And The Nucleus Of Comet 9P/Tempel 1

    NASA Astrophysics Data System (ADS)

    Kueppers, Michael; Rengel, M.; Keller, H. U.; Gutiérrez, P. J.; Hviid, S. F.

    2007-10-01

    When Deep Impact fired its projectile into the nucleus of comet 9P/Tempel 1, a cloud made of dust and icy grains was ejected from the impact crater. The dust was subsequently accelerated by gas drag. About a week after the impact event, the dust cloud had dispersed due to its expansion and the force exerted by solar radiation pressure. The light curve of the dust cloud contains information about its formation and evolution: The time scale of production of impact created material can be derived from the time scale of the brightness increase. The velocity distribution of the cloud is indicative of acceleration processes in the inner coma of the comet. Finally, the abundance of large dust particles created by the impact can be estimated from the brightness of the cloud several days after the impact when small particles have been pushed away by radiation pressure. Here we analyze data obtained by the Narrow Angle Camera (NAC) of OSIRIS onboard the ESA spacecraft Rosetta to derive the velocity distribution of the dust cloud from an inversion of its light curve. OSIRIS observed comet Tempel 1 near-continuously for more than two weeks around the impact. A model of the expansion of the ejecta is compared to the light curve seen by the NAC. We derive a broad velocity distribution of the dust particles, which peaks at around 225 m/s, in good agreement with published estimates. The velocities suggest that the impact ejecta were quickly accelerated by gas in the cometary coma. We will discuss implications of our results for the evolution of the dust cloud during the first hours after the impact and provide estimates of the released dust mass. OSIRIS is funded by the agencies ASI, CNES, DLR, the Spanish Space Program (Ministerio de Educación y Ciencia), SNSB, and ESA.

    1. Time Delay Measurements for the Cluster-lensed Sextuple Quasar SDSS J2222+2745

      NASA Astrophysics Data System (ADS)

      Dahle, H.; Gladders, M. D.; Sharon, K.; Bayliss, M. B.; Rigby, J. R.

      2015-11-01

      We report first results from an ongoing monitoring campaign to measure time delays between the six images of the quasar SDSS J2222+2745, gravitationally lensed by a galaxy cluster. The time delay between A and B, the two most highly magnified images, is measured to be {τ }{{AB}}=47.7+/- 6.0 days (95% confidence interval), consistent with previous model predictions for this lens system. The strong intrinsic variability of the quasar also allows us to derive a time delay value of {τ }{{CA}}=722+/- 24 days between image C and A, in spite of modest overlap between their light curves in the current data set. Image C, which is predicted to lead all the other lensed quasar images, has undergone a sharp, monotonic flux increase of 60%–75% during 2014. A corresponding brightening is firmly predicted to occur in images A and B during 2016. The amplitude of this rise indicates that time delays involving all six known images in this system, including those of the demagnified central images D–F, will be obtainable from further ground-based monitoring of this system during the next few years. Based on observations made with the Nordic Optical Telescope, operated on the island of La Palma jointly by Denmark, Finland, Iceland, Norway, and Sweden, in the Spanish Observatorio del Roque de los Muchachos of the Instituto de Astrofisica de Canarias, and including observations obtained at the Gemini Observatory, which is operated by the Association of Universities for Research in Astronomy, Inc., under a cooperative agreement with the NSF on behalf of the Gemini partnership: the National Science Foundation (United States), the National Research Council (Canada), CONICYT (Chile), the Australian Research Council (Australia), Ministério da Ciência, Tecnologia e Inovação (Brazil) and Ministerio de Ciencia, Tecnologi´a e Innovación Productiva (Argentina).

    2. Additional Spitzer IRS Spectroscopy of Three Intermediate Polars: The Detection of a Mid-infrared Synchrotron Flare from V1223 Sagittarii

      NASA Astrophysics Data System (ADS)

      Harrison, Thomas E.; Bornak, Jillian; Rupen, Michael P.; Howell, Steve B.

      2010-02-01

      We present new Spitzer Infrared Spectrograph (IRS) observations of three intermediate polars: V1223 Sgr, EX Hya, and V603 Aql. We detected a strong, fading flare event from V1223 Sgr. During this event, the flux declined by a factor of 13 in 30 minutes. Given the similarity in the slope of its mid-infrared spectrum during this event to that of AE Aqr, we suggest that this event was caused by transient synchrotron emission. Thus, V1223 Sgr becomes the third cataclysmic variable known to be a synchrotron source. We were unable to confirm the mid-infrared excess noted by Harrison et al. (Paper I) for EX Hya, suggesting that this object is either not a synchrotron source, or is slightly variable. Due to a very high background, V603 Aql was not detected in the long-wavelength regions accessible to the IRS. Given the recent detection of SS Cygni at radio wavelengths during outburst, we extract archival Spitzer IRS spectra for this source obtained during two successive maxima. These spectra do not show a strong excess, but without simultaneous data at shorter wavelengths, it is not possible to determine whether there is any contribution to the mid-infrared fluxes from a synchrotron jet. Includes 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).

    3. Observations Of The LCROSS Impact With NIFS On The Gemini North Telescope

      NASA Astrophysics Data System (ADS)

      Roth, Katherine; Stephens, A. W.; Trujillo, C. A.; McDermid, R. M.; Woodward, C. E.; Walls, B. D.; Coulson, D. M.; Matulonis, A. C.; Ball, J. G.; Wooden, D. H.

      2010-01-01

      The Lunar CRater Observation and Sensing Satellite (LCROSS) Centaur rocket impacted a permanently shadowed crater near the south pole of the Moon at 11:31 UTC 2009 October 09. Gemini, one of several telescopes in a coordinated network observing the impact, conducted observations using NIFS to obtain 3D K-band imaging spectroscopy to detect water ice in the ejected plume of material. The spectral slope of the NIFS data can constrain the grain size and height distribution as the plume evolves, measuring the total mass and the water ice concentration in the plume. These observations provided an engineering challenge for Gemini, including the need to track non-sidereal with constantly changing track rates and guide on small bright moon craters, in order to keep the impact site within the NIFS field-of-view. High quality images taken by GMOS-N, NIRI and the acquisition camera during engineering periods at specific lunar libration and illumination were also used by the LCROSS ground based observing team to supplement slit positioning and offset plans for other ground based observatories. LCROSS mission support and engineering has resulted in improved telescope functionality for non-sidereal targets, including the ability to upload and import target ephemerides directly into the TCS, starting in semester 2010B. In this poster we present the engineering results and observing improvements which will facilitate enhanced user capabilities of the Gemini telescopes arising from the intensive LCROSS support challenge. Gemini Observatory is operated by AURA, Inc., under a cooperative agreement with the NSF on behalf of the Gemini partnership: the NSF (United States), the STFC (United Kingdom), the NRC (Canada), CONICYT (Chile), the ARC (Australia), Ministério da Ciência e Tecnologia (Brazil), and Ministerio de Ciencia, Tecnología e Innovación Productiva (Argentina). In part this research was supported by NASA through contracts to SWRI and NSF grant AST-0706980 to the U

    4. 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.

    5. Penetrating the Homunculus—Near-Infrared Adaptive Optics Images of Eta Carinae

      NASA Astrophysics Data System (ADS)

      Artigau, Étienne; Martin, John C.; Humphreys, Roberta M.; Davidson, Kris; Chesneau, Olivier; Smith, Nathan

      2011-06-01

      Near-infrared adaptive optics imaging with the Near-Infrared Coronagraphic Imager (NICI) and NaCO reveal what appears to be a three-winged or lobed pattern, the "butterfly nebula," outlined by bright Brγ and H2 emission and light scattered by dust. In contrast, the [Fe II] emission does not follow the outline of the wings, but shows an extended bipolar distribution which is tracing the Little Homunculus ejected in η Car's second or lesser eruption in the 1890s. Proper motions measured from the combined NICI and NaCO images together with radial velocities show that the knots and filaments that define the bright rims of the butterfly were ejected at two different epochs corresponding approximately to the great eruption and the second eruption. Most of the material is spatially distributed 10°-20° above and below the equatorial plane apparently behind the Little Homunculus and the larger SE lobe. The equatorial debris either has a wide opening angle or the clumps were ejected at different latitudes relative to the plane. The butterfly is not a coherent physical structure or equatorial torus but spatially separate clumps and filaments ejected at different times, and now 2000-4000 AU from the star. Based on observations obtained at the Gemini Observatory (program ID: GS-2008B-DD-6), 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).

    6. 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.

    7. Instruction No. 3/1988, 1 June 1988.

      PubMed

      1988-01-01

      This Instruction contains provisions relating to the injury and maltreatment of children and women and the enforcement of support payments to women and children. With respect to the maltreatment of children, it provides that the Spanish Office of the Public Prosecutor shall a) curb child abuse; b) take decisive action to protect minors who have been abused or are helpless and to execute the new responsibilities imposed by Law 21/1987 of November 11, which modifies the Civil Code with respect to adoption; and c) collect the necessary data with regard to felonies or misdemeanors that involve child abuse so as to allow for the compilation of annual statistics which may identify the magnitude of this problem; With respect to the maltreatment of women, the prosecutor shall a) curb the abuse of women, investigating those cases where a lack of evidence exists because women are afraid; and b) collect the necessary data with regard to felonies or misdemeanors that involve the abuse of women so as to allow for the compilation of annual statistics which may identify the social reality of this problem. With respect to support payments, the Instruction urges all prosecutors to monitor the execution of support payments using all judicial means authorized, including penal actions when applicable, or enforcement mechanisms which have been mentioned in this memo, that is, conditioning visitation rights on timely payment of the support established for food and education of the children. In Circular No. 32 of 15 April 1988, the National Directorate of Police is called on to provide all necessary police assistance to women who have been the object of illegitimate acts of force so that they can report such acts and to inform women of laws designed to help them and the means of availing themselves of these laws. See Anuario de Derecho Penal y Ciencias Penales, Vol. 41, No. 3, September-December 1988, p. 978.

    8. Identifing Atmospheric Pollutant Sources Using Artificial Neural Networks

      NASA Astrophysics Data System (ADS)

      Paes, F. F.; Campos, H. F.; Luz, E. P.; Carvalho, A. R.

      2008-05-01

      The estimation of the area source pollutant strength is a relevant issue for atmospheric environment. This characterizes an inverse problem in the atmospheric pollution dispersion. In the inverse analysis, an area source domain is considered, where the strength of such area source term is assumed unknown. The inverse problem is solved by using a supervised artificial neural network: multi-layer perceptron. The conection weights of the neural network are computed from delta rule - learning process. The neural network inversion is compared with results from standard inverse analysis (regularized inverse solution). In the regularization method, the inverse problem is formulated as a non-linear optimization approach, whose the objective function is given by the square difference between the measured pollutant concentration and the mathematical models, associated with a regularization operator. In our numerical experiments, the forward problem is addressed by a source-receptor scheme, where a regressive Lagrangian model is applied to compute the transition matrix. The second order maximum entropy regularization is used, and the regularization parameter is calculated by the L-curve technique. The objective function is minimized employing a deterministic scheme (a quasi-Newton algorithm) [1] and a stochastic technique (PSO: particle swarm optimization) [2]. The inverse problem methodology is tested with synthetic observational data, from six measurement points in the physical domain. The best inverse solutions were obtained with neural networks. References: [1] D. R. Roberti, D. Anfossi, H. F. Campos Velho, G. A. Degrazia (2005): Estimating Emission Rate and Pollutant Source Location, Ciencia e Natura, p. 131-134. [2] E.F.P. da Luz, H.F. de Campos Velho, J.C. Becceneri, D.R. Roberti (2007): Estimating Atmospheric Area Source Strength Through Particle Swarm Optimization. Inverse Problems, Desing and Optimization Symposium IPDO-2007, April 16-18, Miami (FL), USA, vol 1, p

    9. Operational forecasting of daily temperatures in the Valencia Region. Part I: maximum temperatures in summer.

      NASA Astrophysics Data System (ADS)

      Gómez, I.; Estrela, M.

      2009-09-01

      Extreme temperature events have a great impact on human society. Knowledge of summer maximum temperatures is very useful for both the general public and organisations whose workers have to operate in the open, e.g. railways, roadways, tourism, etc. Moreover, summer maximum daily temperatures are considered a parameter of interest and concern since persistent heat-waves can affect areas as diverse as public health, energy consumption, etc. Thus, an accurate forecasting of these temperatures could help to predict heat-wave conditions and permit the implementation of strategies aimed at minimizing the negative effects that high temperatures have on human health. The aim of this work is to evaluate the skill of the RAMS model in determining daily maximum temperatures during summer over the Valencia Region. For this, we have used the real-time configuration of this model currently running at the CEAM Foundation. To carry out the model verification process, we have analysed not only the global behaviour of the model for the whole Valencia Region, but also its behaviour for the individual stations distributed within this area. The study has been performed for the summer forecast period of 1 June - 30 September, 2007. The results obtained are encouraging and indicate a good agreement between the observed and simulated maximum temperatures. Moreover, the model captures quite well the temperatures in the extreme heat episodes. Acknowledgement. This work was supported by "GRACCIE" (CSD2007-00067, Programa Consolider-Ingenio 2010), by the Spanish Ministerio de Educación y Ciencia, contract number CGL2005-03386/CLI, and by the Regional Government of Valencia Conselleria de Sanitat, contract "Simulación de las olas de calor e invasiones de frío y su regionalización en la Comunidad Valenciana" ("Heat wave and cold invasion simulation and their regionalization at Valencia Region"). The CEAM Foundation is supported by the Generalitat Valenciana and BANCAIXA (Valencia, Spain).

    10. Highly erodible terrain in agriculture land against chipped pruned branches. Or how to stop the soil erosion with low investment

      NASA Astrophysics Data System (ADS)

      Cerdà, A.

      2009-04-01

      The session on "Soil erosion and sediment control with vegetation and bioengineering on severely eroded terrain" pays special attention to the severe soil erosion suffered on steep slopes and erodible parent materials and soils. Within the last 20 years, in the Mediterranean lands, the citrus orchards were reallocated on steep slopes due to the urban development and better climatic and management conditions of the new plantations. The lack of vegetation cover on the new slope plantations of citrus resulted in high erosion rates. Those non-sustainable soil losses were measured by means of rainfall simulation experiments, Gerlach collectors, geomorphological transect and topographical measurements. The October 2007 and October 2008 rainy periods resulted in sheet, rill and gully erosion. Some recently planted orchards (2005) had the first pruning season in 2008. The pruned chipped branches reduced the soil losses to 50 % of the expected, although the litter (pruned branches) covered 4.67 % of the soil. This is why a research was developed by means of simulated rainfall experiments to determine the vegetation cover (litter, mainly leaves) to protect the soil to reach a sustainable erosion rate. Rainfall simulation experiments at 43 mm h-1 where performed on 1 m2 plots covered with 0, 3, 7, 15, 30, 45, 60, 80 and 100 % litter cover (pruned chipped branches) to determine the sustainable litter cover to avoid the soil losses. The results show that more that 45 % litter cover almost reduces the soil losses to negligible rates. The results confirm that 4 % of vegetation cover reduces the soil losses to 50 %. Key words: Agriculture land, erodible terrain, land management, citrus, erosion, Spain, Valencia, herbicides. Acknowledgements, We thanks the financial support of the Ministerio de Ciencia e Innovación by means of the project CGL2008-02879/BTE, "PERDIDA DE SUELO EN NUEVAS EXPLOTACIONES CITRICOLAS EN PENDIENTE. ESTRATEGIAS PARA EL CONTROL DE LA EROSION HIDRICA"

    11. Incorporating climate science in applications of the US endangered species act for aquatic species.

      PubMed

      McClure, Michelle M; Alexander, Michael; Borggaard, Diane; Boughton, David; Crozier, Lisa; Griffis, Roger; Jorgensen, Jeffrey C; Lindley, Steven T; Nye, Janet; Rowland, Melanie J; Seney, Erin E; Snover, Amy; Toole, Christopher; VAN Houtan, Kyle

      2013-12-01

      Aquatic species are threatened by climate change but have received comparatively less attention than terrestrial species. We gleaned key strategies for scientists and managers seeking to address climate change in aquatic conservation planning from the literature and existing knowledge. We address 3 categories of conservation effort that rely on scientific analysis and have particular application under the U.S. Endangered Species Act (ESA): assessment of overall risk to a species; long-term recovery planning; and evaluation of effects of specific actions or perturbations. Fewer data are available for aquatic species to support these analyses, and climate effects on aquatic systems are poorly characterized. Thus, we recommend scientists conducting analyses supporting ESA decisions develop a conceptual model that links climate, habitat, ecosystem, and species response to changing conditions and use this model to organize analyses and future research. We recommend that current climate conditions are not appropriate for projections used in ESA analyses and that long-term projections of climate-change effects provide temporal context as a species-wide assessment provides spatial context. In these projections, climate change should not be discounted solely because the magnitude of projected change at a particular time is uncertain when directionality of climate change is clear. Identifying likely future habitat at the species scale will indicate key refuges and potential range shifts. However, the risks and benefits associated with errors in modeling future habitat are not equivalent. The ESA offers mechanisms for increasing the overall resilience and resistance of species to climate changes, including establishing recovery goals requiring increased genetic and phenotypic diversity, specifying critical habitat in areas not currently occupied but likely to become important, and using adaptive management. Incorporación de las Ciencias Climáticas en las Aplicaciones del

    12. Polarimetry of the Highly Reddened Open Clusters HOGG 15 and Lyngå 14

      NASA Astrophysics Data System (ADS)

      Orsatti, A. M.; Vega, E.; Marraco, H. G.

      1998-07-01

      We present UBVRI polarimetric observations of stars belonging to the highly reddened open clusters Hogg 15 and Lyngå 14. The wavelength of maximum polarization is computed and then analyzed in the context of its relation to the optical properties and characteristic particle size distribution of the grains responsible for the polarization in each case. The amount and direction of the linear polarization are also computed. Results indicate that the polarization efficiency is relatively low in both cases, compared with the values attributed to the interstellar medium, and probably due to depolarization effects. Only one out of the 12 observed members in Hogg 15, and none in Lyngå 14, presents indications of intrinsic polarization in its measures. There exists some ``intracluster'' dust in association with Hogg 15, with a slightly different grain size distribution when compared with the Coalsack dust itself. For Lyngå 14, we conclude that the polarization detected in this case possibly comes from dust present in a nearby cloud located along the line of sight to the cluster, with some dust related to the cluster itself. The magnetic field in the direction to Hogg 15 follows the general trend of the polarization directions in the region, but this is not true for Lyngå 14, where differences seem to exist. Based on observations at the Complejo Astronómico El Leoncito, operated under agreement among the Consejo Nacional de Investigaciones Científicas y Técnicas de la República Argentina, Secretaría de Ciencia y Tecnología de la Nación, and the National Universities of La Plata, Córdoba, and San Juan.

    13. [Critical analysis of awards in gastroenterology research. The Mexican experience].

      PubMed

      Chávez-Tapia, Norberto C; Téllez-Avila, Félix I; Hernández-Calleros, Jorge; López-Arce, Gustavo; Franco-Guzmán, Ada; Uribe, Misael

      2008-01-01

      The impact of Mexican gastrointestinal research worldwide is limited and the outcome of the best research papers awarded by the Asociación Mexicana de Gastroenterología (AMG) is unknown. The objective of this study was to analyze the publication pattern of the research work, awarded by the AMG and their impact in international journals. The abstracts accepted for the annual meeting of the AMG from 1998 to 2006 were reviewed. Those presented in a plenary session or awarded were included. Their abstracts were searched in electronic databases. When not found, the main author was contacted by e-mail. In those papers published in a journal with an impact factor, the times it was cited were assessed. 35 abstracts were identified, mainly in gastroenterology (57.1%) and hepatology (34.3). Only in 5.7% (n=2) some of the authors were members of the governing board of AMG. The awarded institutions were Instituto Nacional de Ciencias Médicas y Nutrición Salvador Zubirán (48.6%), Universities (Universidad Autónoma de Nuevo León, Universidad Nacional Autónoma de México and the Benemérita Universidad Autónoma de Puebla) (31.4%), Instituto Mexicano del Seguro Social (8.6%), Fundación Clínica Médica Sur (5.7%), Hospital Juárez (2.9%), Private hospital (2.9%). Most of the papers were published within a year (73.7%). Only 2 papers had more than 10 citations in another international journal with impact factor, with a median for all paper of 5 citations (0-45). Considering all institutions, the rate of publication is 48%. Only half of the awarded works were published and mainly in journals of local distribution. The impact of these studies worldwide is limited.

    14. The impact of a Latino outreach project on science museums: A program evaluation focused on institutional change

      NASA Astrophysics Data System (ADS)

      Castaneda, Mario E.

      The purpose of this program evaluation was to determine the impact of the Community Science Festivals Project on the science museums that participated. This project, also known as Celebra la Ciencia (CLC), was a federally funded effort to engage the Latino communities throughout the United States in activities promoting appreciation of the importance of science education. The festivals brought together various educational, community, and scientific organizations that collaborated in producing community-hosted interactive educational events to which students and their families were invited. The evaluation takes the form of a qualitative study based on interviews of key individuals at 1 museum in each of the 5 festival cities. The evaluation focuses on the museums' changes in: (a) their view of their roles as involving the Latino population in their service area, (b) publicity efforts aimed at the Latino population, (c) outreach toward the Latino population, and (d) accommodation of Latinos within the museums. The results for each site are listed separately then are discussed jointly. Implications for practice include the following: (a) intensive and long-term programming, as opposed to one-time events, are likely more effective for creating direct impact on student achievement, although the festivals had many positive effects; (b) funding for smaller organizations (or individual departments within larger organization) seemed to have a more observable impact, enabling them to create Latino-oriented advertising, outreach, and accommodations that would not have been possible otherwise; and (c) Spanish-language media was an effective advertising tool, especially radio, but use of public service announcements should be monitored to ensure that they are aired at times that are effective for reaching the target audience. Recommendations for future studies are made.

    15. 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

    16. [Bibliometric analysis of Revista Médica del IMSS in the Scopus database for the period between 2005-2013].

      PubMed

      García-Gómez, Francisco; Ramírez-Méndez, Fernando

      2015-01-01

      Objetivo: analizar la visibilidad de la Revista Médica del Instituto Mexicano del Seguro Social (Rev Med Inst Mex Seguro Soc) en la base de datos Scopus y describir los principales indicadores bibliométricos cuantitativos de la producción científica publicados durante el periodo 2005-2013. Métodos: para el análisis se utilizó la base de datos Scopus y se limitó el periodo de búsqueda a los años 2005-2013. La estrategia de búsqueda se ejecutó en los campos específicos de Título de la Publicación (Source Title) con el término Revista Médica del Instituto Mexicano del Seguro Social y sus posibles variantes, asícomo el número ISSN de la revista. Para el análisis de los datos obtenidos se utilizaron las herramientas de Scopus y los programas Excel y Access. Resultados: se encontraron 864 trabajos publicados durante el periodo 2005-2013 que fueron incluidos en Scopus. Se identificaron los autores con mayor producción científica y mayor número de citas acumuladas a sus trabajos, asícomo las principales revistas que citan a la Rev Med Inst Mex Seguro Soc. Se describen las principales áreas temáticas, tipos de documentos y otros indicadores bibliométricos que caracterizan a la publicación. Conclusiones: el uso de Scopus brinda la posibilidad de analizar con una herramienta externa al IMSS la visibilidad de la producción científica publicada en la Revista Médica del IMSS, además de que contribuye a identificar el estado de la ciencia en México y de los países en vías desarrollo.

    17. Desarrollo de un instrumento para medir percepciones sobre el contexto de construccion del conocimiento cientifico de estudiantes universitarios de nuevo ingreso

      NASA Astrophysics Data System (ADS)

      Garcia-Ramirez, Jaime Antonio

      En esta investigacion, se desarrollo un instrumento que permite medir percepciones relacionadas al contexto de constriccion del conocimiento cientifico. Se examinaron instrumentos existentes y se encontro que el VOSTS (Views on science, technology, and society), instrumento desarrollado empiricamente en Canada por Aikenhead, Ryan y Fleming, podia traducirse y validarse en el contexto cultural puertorriqueno. El instrumento es extenso, consta de 113 reactivos, cada uno con una premisa basica relacionada a la tematica ciencia, tecnologia y sociedad y un numero de alternativas relacionadas a la premisa que oscila entre siete y trece. Se delimito su utilizacion a los quince reactivos identificados por los autores como relacionados a la construccion social del conocimiento cientifico. Metodologicamente, se procedio a utilizar el modelo de adaptacion intercultural, que permite que el instrumento desarrollado satisfaga las dimensiones de equivalencia semantica, de contenido, tecnica, de criterio y conceptual, atemperado asi al instrumento original. Se cumplio con este proposito mediante la traduccion de la version original en ingles al espanol y viceversa. Se utilizaron comites para examinar la traduccion y la retro-traduccion del instrumento. Se realizo una prueba piloto con estudiantes universitarios de nuevo ingreso, utilizando el instrumento traducido para asegurar su intelegibilidad. La confiabilidad del instrumento se determino mediante la intervencion de un panel de expertos quienes clasificaron las distintas posiciones dentro de cada reactivo en: realista, con merito e ingenua; se transformaron estas opciones en valores numericos lo que permitio establecer una escala Likert para cada una. Se suministro el instrumento a una muestra de estudiantes universitarios de nuevo ingreso con caracteristicas similares a las de la poblacion puertorriquena en cuanto a ejecucion en las pruebas de aptitud verbal y matematica del College Board. Los resultados de sus contestaciones

    18. [Hematopoietic stem-cell transplantation in aplastic anemia].

      PubMed

      Hernández-Rivera, E Gabriela

      2005-01-01

      Severe aplastic anemia is a rare syndrome characterized by bone marrow failure with cytopenias and hypocellular bone marrow biopsy (usually 10-15%), without blasts or myelodysplasia. The first choice treatment for these patients is allogeneic bone marrow transplantation from a sibling matched for HLA-A, HLA-B and HLA-DR. Unfortunately only 30% of patients have an HLA-matched sibling (a 25% chance per sibling). The alternative treatment for severe aplastic anemia for the rest of the patients (70%) is immunosuppression with antithymocyte globuline and cyclosporine. The evolution of bone marrow transplantation since 1970's has been positive in terms of survival and transplant success (initial overall survival 43% vs. 90% lately, and graft rejection of 29% vs. 4%). The favorable outcome of bone marrow transplantation for severe or very severe aplastic anemia is due to: the use of conditioning with antithymocyte globuline and cyclophosphamide, the use of graft-vs.-host disease prophylaxis with short curse methotrexate and cyclosporine and the use of filtrated and irradiated blood products. For those patients without an HLA-matched related donor the first treatment to use is the immunosuppression with antithymocyte globuline and cyclosporine. Another option emerged in the late 80's is the unrelated bone marrow transplantation, with survival hardly half of the HLA-identical related bone marrow transplants. In our country, the first allogeneic bone marrow transplant was done in the Instituto Nacional de Ciencias Médicas y Nutrición, Salvador Zubirán, in a patient with aplastic anemia, making possible to perform this procedure safely in our country.

    19. [Guideline for the assessment of clinical research proposals. Comisión Nacional de Investigación Científica del Instituto Mexicano del Seguro Social].

      PubMed

      Mejía-Aranguré, Juan Manuel; Grijalva-Otero, Israel; Majluf-Cruz, Abraham; Cruz-López, Miguel; Núñez-Enríquez, Juan Carlos; Salamanca-Gómez, Fabio Abdiel

      2013-01-01

      Antecedentes: la investigación médica es una herramienta fundamental para lograr el avance de la ciencia al mejorar las acciones encaminadas a proteger, promover y restaurar la salud del individuo y de la sociedad en general. Las tres características imprescindibles para que un protocolo de investigación sea autorizado son: relevancia científica, calidad técnica y el cumplimiento de los aspectos éticos. Material y métodos: estudio retrospectivo efectuado con base en la búsqueda específica en Pubmed, Medline, Ovid y Google Scholar con los términos: peer review, research proposals, review and protocols and reviewers. Debido a que no se identificó ningún artículo que refiriera específicamente los criterios para evaluar protocolos de investigación clínica, se hizo un consenso entre los vocales de la Comisión Nacional de Investigación Científica del Instituto Mexicano del Seguro Social, que está integrada por investigadores titulares de la institución, todos pertenecientes al Sistema Nacional de Investigadores. Se discutieron los criterios que debieran componer una revisión adecuada y cuáles debieran ser los rubros que deben incluirse en el análisis. Resultados: se integraron los criterios específicos que le permitirán al revisor de un protocolo de investigación realizar una crítica con bases metodológicas aceptadas por un consenso de investigadores. Conclusiones: un revisor debe ser considerado como un promotor del avance del conocimiento científico que, mediante sus comentarios y su dictamen, permite que los investigadores incrementen la calidad de sus protocolos de investigación.

    20. Enterococcus gallinarum carrying the vanA gene cluster: first report in Brazil.

      PubMed

      Camargo, I L B C; Barth, A L; Pilger, K; Seligman, B G S; Machado, A R L; Darini, A L C

      2004-11-01

      In 2000, Enterococcus faecalis resistant to vancomycin was first reported at a tertiary hospital in Porto Alegre, southern Brazil. The resistance spread to other hospitals and surveillance programs were established by hospital infection committees to prevent the spread of vancomycin-resistant enterococci. In February 2002, an isolate initially identified at the genus level as Enterococcus was obtained by surveillance culture (rectal swab) from a patient admitted to a hospital for treatment of septic arthritis in the shoulder. The isolate proved to be resistant to vancomycin by the disc diffusion method and confirmed by an E-test resulting in a minimal inhibitory concentration of > or = 256 microg/ml. This isolate was sent to a reference laboratory (Laboratorio Especial de Bacteriologia e Epidemiologia Molecular, Faculdade de Ciencias Farmaceuticas de Ribeirao Preto, USP) for further study and proved to be an E. gallinarum by the polymerase chain reaction (PCR) using specific primers for the species. Due to the phenotype of unusually high vancomycin resistance, the isolate presumably had the resistance genes (vanA and vanB) and this was confirmed by PCR, which indicated the presence of the vanA gene. A 10.8-kb Tn1546-related transposon was also identified by long-PCR. Interspecies transfer of the vancomycin-resistance gene from the donor E. gallinarum was performed in a successful conjugation experiment in vitro, using E. faecium GE-1 and E. faecalis JH22 as receptors. This is the first report of the detection of a vanA determinant naturally acquired by E. gallinarum in Brazil, indicating the importance of characterizing VRE by both phenotype and genotype methods.

    1. Chile's dilemma: how to reinsert scientists trained abroad.

      PubMed

      Nunez-Parra, Alexia; Ramos, Maria-Paz

      2014-01-01

      Chile is recognized worldwide as an emergent economy, with a great power in natural resource exploitation. Nonetheless, despite being one of the most developed countries in Latin America, Chile imports most of the knowledge and technology necessary to drive innovation in the country. The tight budget that the Chilean government assigned to research and development and the absence of a long-term scientific agenda contributed to a limited supply of scientists over the years. In an effort to reverse this scenario, Chile has created several fellowships, such as the Becas Chile Program (BCP) to encourage new generations to pursue graduate studies to ultimately advance research and development in situ. More than 6000 fellows are now being trained abroad, accumulating an incredible potential to transform the Chilean scientific environment as we know it.  Chile now faces a greater challenge: it has to offer infrastructure and job openings to the highly skilled professionals in whom it invested. Unfortunately no clear public policies to address this situation have been developed, partially due to the lack of a dedicated institution, such as a Ministry for Science and Technology which could focalize the necessary efforts to promote such policies. Therefore, in the meantime, Chilean scientist have been motivated to create different organizations, such as, Mas Ciencia para Chile and Nexos Chile-USA, to promote constructive discussion of the policies that could be implemented to improve the Chilean scientific situation. We hope that these and other organizations have a real impact on the generation of scientific guidelines that will finally contribute to the development of the country.

    2. Integrating the GalileoScope into Successful Outreach Programming

      NASA Astrophysics Data System (ADS)

      Michaud, Peter D.; Slater, S.; Goldstein, J.; Harvey, J.; Garcia, A.

      2010-01-01

      Since 2004, the Gemini Observatory’s week-long Journey Through the Universe (JTtU) program has successfully shared the excitement of scientific research with teachers, students and the public on Hawaii’s Big Island. Based on the national JTtU program started in 1999, the Hawai‘i version reaches an average of 7,000 students annually and each year features a different theme shared with a diverse set of learners. In 2010, the theme includes the integration of the GalileoScope-produced as a keystone project for the International Year of Astronomy. In preparation, a pilot teacher workshop (held in October 2009) introduced local island teachers to the GalileoScope and a 128-page educator’s activity resource book coordinated by the University of Wyoming. Response from this initial teacher’s workshop has been strong and evaluations plus follow-up actions by participating teachers illustrate that the integration of the GalileoScope has been successful based upon this diverse sample. Integrating GalileoScopes into Chilean schools in 2010 is also underway at Gemini South. This program will solicit informal proposals from educators who wish to use the telescopes in classrooms and a Spanish version of the teacher resource book is planned. The authors conclude that integration of the GalileoScope into an existing outreach program is an effective way to keep content fresh, relevant and engaging for both educators and students. This initiative is funded by Gemini Observatory outreach program. The Gemini Observatory 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 (US), the Science and Technology Facilities Council (UK), 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

    3. Calculating impact factor: how bibliographical classification of journal items affects the impact factor of large and small journals.

      PubMed

      Golubic, Rajna; Rudes, Mihael; Kovacic, Natasa; Marusic, Matko; Marusic, Ana

      2008-03-01

      As bibliographical classification of published journal items affects the denominator in this equation, we investigated how the numerator and denominator of the impact factor (IF) equation were generated for representative journals in two categories of the Journal Citation Reports (JCR). We performed a full text search of the 1st-ranked journal in 2004 JCR category "Medicine, General and Internal" (New England Journal of Medicine, NEJM, IF = 38.570) and 61st-ranked journal (Croatian Medical Journal, CMJ, IF = 0.690), 1st-ranked journal in category "Multidisciplinary Sciences" (Nature, IF = 32.182) and journal with a relative rank of CMJ (Anais da Academia Brasileira de Ciencias, AABC, IF = 0.435). Large journals published more items categorized by Web of Science (WoS) as non-research items (editorial material, letters, news, book reviews, bibliographical items, or corrections): 63% out of total 5,193 items in Nature and 81% out of 3,540 items in NEJM, compared with 31% out of 283 items in CMJ and only 2 (2%) out of 126 items in AABC. Some items classified by WoS as non-original contained original research data (9.5% in Nature, 7.2% in NEJM, 13.7% in CMJ and none in AABC). These items received a significant number of citations: 6.9% of total citations in Nature, 14.7% in NEJM and 18.5% in CMJ. IF decreased for all journals when only items presenting original research and citations to them were used for IF calculation. Regardless of the journal's size or discipline, publication of non-original research and its classification by the bibliographical database have an effect on both numerator and denominator of the IF equation.

    4. [Eating habits and attitudes towards change in Spanish university students and workers].

      PubMed

      Zazpe, Itziar; Marqués, María; Sánchez-Tainta, Ana; Rodríguez-Mourille, Ana; Beunza, Juan-José; Santiago, Susana; Fernández-Montero, Alejandro

      2013-01-01

      Introducción: El entorno educativo y laboral ha adquirido protagonismo como ámbito prometedor para llevar a cabo intervenciones nutricionales en población adulta. Objetivos: El objetivo de este trabajo es evaluar los hábitos alimentarios y actitudes hacia el cambio en trabajadores y alumnos universitarios con distinto perfil académico. Métodos: Estudio epidemiológico descriptivo de tipo transversal en población universitaria española de 1.429 sujetos. Se analizaron los hábitos alimentarios y las actitudes hacia el cambio de hábitos. Resultados: La edad media de los trabajadores fue de 37 años y en los estudiantes de 23 años. En ambos grupos el fraccionamiento de la ingesta más frecuente fue de cuatro tomas al día. En los alumnos se observó menor frecuencia de consumo de verdura, vino, pescado y frutos secos y mayor de bebidas carbonatadas, repostería comercial, fast-food y carnes rojas. Por otro lado, en general los hábitos alimentarios de los estudiantes de ciencias fueron más saludables que los de letras. Aunque no se observaron diferencias significativas en las actitudes hacia el cambio entre estudiantes y trabajadores, el 32% de los empleados y el 39% de los estudiantes afirmaron estar planteándose seriamente cambiar sus costumbres. Conclusiones: El patrón alimentario fue más saludable entre los trabajadores que entre los alumnos, especialmente en aquellos que cursan grados de letras, que constituyen el grupo más vulnerable desde el punto de vista nutricional. Además, aproximadamente un tercio de los trabajadores y alumnos se planteaba modificar sus hábitos.

    5. Towards Year 2009, a 25 000 person rehearsal

      NASA Astrophysics Data System (ADS)

      Fierro Gossman, Julieta; Espinosa, M.

      2008-05-01

      In this presentations we will talk about the way we planned and achieved successfully a 25 000 people observation in Mexico City downtown taking advantage of a lunar eclipse. We shall guide people so they think about their own activities. We shall mention the way we planned the event, carried out found raising and advertisement. We shall describe the way we handled people mainly during the observations with one hundred telescopes and parallel activities. These included: a public lecture enhanced with dance and hands-on demonstrations, workshops for children, workshops on the night sky, talking to an astronomer, how to handle a telescope and a picture exhibit as well as music till midnight. We shall also mentioned written materials for that particular event and for Year 2009, some of which were specially crafted for teachers. 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, Galileo para Maestros I Correo del Maestro, Núm. 133, p. 15-26, Anios 12, Junio 2007. Hector Dominguez y Julieta Fierro, Galileo para Maestros II Correo del Maestro, Núm. 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. Mariana Espinosa, Julieta Fierro y Silvia Torres Fiesta de estrellas El Correo del Maestro, aceptado para su publicacion.

    6. The sudden appearance of CO emission in LHA 115-S 65

      NASA Astrophysics Data System (ADS)

      Oksala, M. E.; Kraus, M.; Arias, M. L.; Borges Fernandes, M.; Cidale, L.; Muratore, M. F.; Curé, M.

      2012-10-01

      Molecular emission has been detected in several Magellanic Cloud B[e] supergiants. In this Letter, we report on the detection of CO band head emission in the B[e] supergiant LHA 115-S 65, and present a K-band near-infrared spectrum obtained with the Spectrograph for INtegral Field Observation in the Near-Infrared (SINFONI; R= 4500) on the ESO VLT UT4 telescope. The observed molecular band head emission in S65 is quite surprising in the light of a previous non-detection by McGregor, Hyland & McGinn, as well as a high-resolution (R= 50 000) Gemini/Phoenix spectrum of this star taken nine months earlier showing no emission. Based on analysis of the optical spectrum by Kraus, Borges Fernandes & de Araújo, we suspect that the sudden appearance of molecular emission could be due to density build-up in an outflowing viscous disc, as seen for Be stars. This new discovery, combined with variability in two other similar evolved massive stars, indicates an evolutionary link between B[e] supergiants and luminous blue variables. Based on observations obtained with ESO telescopes at the La Silla Paranal Observatory under programme ID 088.D-044 and 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 (USA), the Science and Technology Facilities Council (UK), the National Research Council (Canada), CONICYT (Chile), the Australian Research Council (Australia), Ministério da Ciência, Tecnologia e Inovação (Brazil) and Ministerio de Ciencia, Tecnología e Innovación Productiva (Argentina), under programme ID GS-2010B-Q-31.

    7. A Dark Spot on a Massive White Dwarf

      NASA Astrophysics Data System (ADS)

      Kilic, Mukremin; Gianninas, Alexandros; Bell, Keaton J.; Curd, Brandon; Brown, Warren R.; Hermes, J. J.; Dufour, Patrick; Wisniewski, John P.; Winget, D. E.; Winget, K. I.

      2015-12-01

      We present the serendipitous discovery of eclipse-like events around the massive white dwarf SDSS J152934.98+292801.9 (hereafter J1529+2928). We selected J1529+2928 for time-series photometry based on its spectroscopic temperature and surface gravity, which place it near the ZZ Ceti instability strip. Instead of pulsations, we detect photometric dips from this white dwarf every 38 minutes. Follow-up optical spectroscopy observations with Gemini reveal no significant radial velocity variations, ruling out stellar and brown dwarf companions. A disintegrating planet around this white dwarf cannot explain the observed light curves in different filters. Given the short period, the source of the photometric dips must be a dark spot that comes into view every 38 minutes due to the rotation of the white dwarf. Our optical spectroscopy does not show any evidence of Zeeman splitting of the Balmer lines, limiting the magnetic field strength to B < 70 kG. Since up to 15% of white dwarfs display kG magnetic fields, such eclipse-like events should be common around white dwarfs. We discuss the potential implications of this discovery on transient surveys targeting white dwarfs, like the K2 mission and the Large Synoptic Survey Telescope. This work is based on observations obtained at the Gemini Observatory, McDonald Observatory, and the Apache Point Observatory 3.5-m telescope. The latter is owned and operated by the Astrophysical Research Consortium. Gemini Observatory is operated by the Association of Universities for Research in Astronomy, Inc., under a cooperative agreement with the NSF on behalf of the Gemini partnership: the National Science Foundation (United States), the National Research Council (Canada), CONICYT (Chile), the Australian Research Council (Australia), Ministério da Ciência, Tecnologia e Inovação (Brazil) and Ministerio de Ciencia, Tecnología e Innovación Productiva (Argentina).

    8. Incorporating climate science in applications of the US endangered species act for aquatic species.

      PubMed

      McClure, Michelle M; Alexander, Michael; Borggaard, Diane; Boughton, David; Crozier, Lisa; Griffis, Roger; Jorgensen, Jeffrey C; Lindley, Steven T; Nye, Janet; Rowland, Melanie J; Seney, Erin E; Snover, Amy; Toole, Christopher; VAN Houtan, Kyle

      2013-12-01

      Aquatic species are threatened by climate change but have received comparatively less attention than terrestrial species. We gleaned key strategies for scientists and managers seeking to address climate change in aquatic conservation planning from the literature and existing knowledge. We address 3 categories of conservation effort that rely on scientific analysis and have particular application under the U.S. Endangered Species Act (ESA): assessment of overall risk to a species; long-term recovery planning; and evaluation of effects of specific actions or perturbations. Fewer data are available for aquatic species to support these analyses, and climate effects on aquatic systems are poorly characterized. Thus, we recommend scientists conducting analyses supporting ESA decisions develop a conceptual model that links climate, habitat, ecosystem, and species response to changing conditions and use this model to organize analyses and future research. We recommend that current climate conditions are not appropriate for projections used in ESA analyses and that long-term projections of climate-change effects provide temporal context as a species-wide assessment provides spatial context. In these projections, climate change should not be discounted solely because the magnitude of projected change at a particular time is uncertain when directionality of climate change is clear. Identifying likely future habitat at the species scale will indicate key refuges and potential range shifts. However, the risks and benefits associated with errors in modeling future habitat are not equivalent. The ESA offers mechanisms for increasing the overall resilience and resistance of species to climate changes, including establishing recovery goals requiring increased genetic and phenotypic diversity, specifying critical habitat in areas not currently occupied but likely to become important, and using adaptive management. Incorporación de las Ciencias Climáticas en las Aplicaciones del

    9. New objects with the B[e] phenomenon in the Large Magellanic Cloud

      NASA Astrophysics Data System (ADS)

      Levato, H.; Miroshnichenko, A. S.; Saffe, C.

      2014-08-01

      Aims: The study is aimed at discovering new objects with the B[e] phenomenon in the Large Magellanic Cloud. Methods: We report medium-resolution optical spectroscopic observations of two newly found (ARDB 54 and NOMAD 0181-0125572) and two previously known (Hen S-59 and Hen S-137) supergiants with the B[e] phenomenon in the Large Magellanic Cloud. The observations were obtained with the GMOS spectrograph at the southern Gemini telescope. Results: The optical spectra and the fundamental parameters of ARDB 54 and NOMAD 0181-0125572 are presented for the first time. We found that the Balmer line profiles of Hen S-59 and Hen S-137 were different from those observed in their spectra nearly 20 years ago. We suggest a higher effective temperature and luminosity for both objects. With the new fundamental parameters, the lowest luminosity for known supergiants with the B[e] phenomenon in the Magellanic Clouds is higher that previously thought (log L/L⊙ ~ 4.5 instead of 4.0). The object Hen S-59 may be a binary system based on its UV excess, variable B - V color-index and radial velocity of emission lines, and periodically variable I-band brightness. 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), the Australian Research Council (Australia), Ministério da Ciência, Tecnologia e Inovacão (Brazil) and Ministerio de Ciencia, Tecnología e Innovación Productiva (Argentina).

    10. Assessment of African and local wind-blown dust contributions at three rural sites in SE Spain: aerosol size distribution

      NASA Astrophysics Data System (ADS)

      Orza, J. A. G.; Cabello, M.; Lidón, V.; Martínez, J.

      2009-04-01

      Aerosol number size distribution and meteorological parameters were measured at three rural sites in semiarid southeastern Spain. Number concentrations of suspended particles in 31 size bins between 0.25 and 32 m diameter were continuosly recorded with a GRIMM 190 aerosol spectrometer at: (i) a rural background (RB) location in a perennial tussock grassland, from July to October 2006; (ii) a rural site surrounded by abandoned croplands, and influenced by mineral industries and by a small paved road having a small traffic load located 30 m to the East (RA), from June to December 2007; and (iii) a rural (R) location in an agricultural plot previously cleared and then lightly leveled and compacted for future lemon-tree cultivation, from February to June 2008. Events of long range transport from North Africa to the study area (African dust outbreaks, ADOs) were identified by aerosol transport models, back-trajectories and satellite imagery. There is an increase in the concentration of particles larger than 2 m with increasing wind speed while the concentrations decrease for smaller particles at the RB and R sites. At the RA location, that increase is observed for particles in the range 1.6 - 3.5 m (the precise value depends on the wind speed) when there are West winds. Particulate resuspension is found to occur at all wind speeds, although wind threshold values can be identified by a sharp increase in particle concentrations for a range of particle sizes. Light winds entrain large particles while stronger winds additionally entrain particles of smaller size (down to 2.5 m for the highest winds). The size distributions present maxima at 1.6 and 3 m on days with ADO. Concentration for almost every particle size is higher on ADOs than on days without such events, due in part to the associated meteorological situation. This work was partially supported by the Spanish Ministerio de Educación y Ciencia under grant CGL2004-04419 (RESUSPENSE Project).

    11. [Prevalence of eating disorders in college students and associated factors: uniHcos project].

      PubMed

      Martínez-González, Leticia; Fernández Villa, Tania; Molina de la Torre, Antonio José; Ayán Pérez, Carlos; Bueno Cavanillas, Aurora; Capelo Álvarez, Rocío; Mateos Campos, Ramona; Martín Sánchez, Vicente

      2014-10-01

      Introducción: Los trastornos de la conducta alimentaria (TCA) son especialmente frecuentes en los jóvenes. Objetivo: Determinar la prevalencia de TCA en jóvenes universitarios y sus factores asociados. Metodología: Estudio de prevalencia en jóvenes universitarios españoles del proyecto uniHcos. Mediante regresión logística no condicional se determinó la magnitud de la asociación entre los factores de riesgo asociados al estilo de vida y padecer un TCA medido mediante el cuestionario Sick, Control, One, Fat, Food (SCOFF). Resultados: La prevalencia de TCA fue del 19,5%, siendo mayor en mujeres (ORa=1,59; p=0,006). En los chicos, tener criterios de padecer TCA se asoció con vivir en colegios mayores, con realizar “binge drinking”, y uso problemático de internet. En las mujeres el estudiar titulaciones diferentes a las ciencias de la salud (ORa=1,50) y el uso problemático de internet (ORa=2,33). Aquellas mujeres con riesgo de TCA presentaban con mayor frecuencia depresión (ORa=2,02), dolores menstruales (ORa=1,81) y mala salud percibida (ORa=1,70). En los hombres, aquellos con riesgo de TCA presentaban con mayor frecuencia una mala salud percibida (ORa=2,42). Conclusiones: El riesgo de obtener resultados positivos en el SCOFF en nuestro estudio es similar a lo publicado para otras poblaciones de estudiantes, así como su asociación con determinadas adicciones y problemas de salud. Se observaron diferencias en función del sexo que precisan atención en el diseño de estrategias de prevención y control.

    12. Chile’s dilemma: how to reinsert scientists trained abroad

      PubMed Central

      2014-01-01

      Chile is recognized worldwide as an emergent economy, with a great power in natural resource exploitation. Nonetheless, despite being one of the most developed countries in Latin America, Chile imports most of the knowledge and technology necessary to drive innovation in the country. The tight budget that the Chilean government assigned to research and development and the absence of a long-term scientific agenda contributed to a limited supply of scientists over the years. In an effort to reverse this scenario, Chile has created several fellowships, such as the Becas Chile Program (BCP) to encourage new generations to pursue graduate studies to ultimately advance research and development in situ. More than 6000 fellows are now being trained abroad, accumulating an incredible potential to transform the Chilean scientific environment as we know it.  Chile now faces a greater challenge: it has to offer infrastructure and job openings to the highly skilled professionals in whom it invested. Unfortunately no clear public policies to address this situation have been developed, partially due to the lack of a dedicated institution, such as a Ministry for Science and Technology which could focalize the necessary efforts to promote such policies. Therefore, in the meantime, Chilean scientist have been motivated to create different organizations, such as, Mas Ciencia para Chile and Nexos Chile-USA, to promote constructive discussion of the policies that could be implemented to improve the Chilean scientific situation. We hope that these and other organizations have a real impact on the generation of scientific guidelines that will finally contribute to the development of the country. PMID:25309739

    13. Toward a Mexican eddy covariance network for carbon cycle science

      NASA Astrophysics Data System (ADS)

      Vargas, Rodrigo; Yépez, Enrico A.

      2011-09-01

      First Annual MexFlux Principal Investigators Meeting; Hermosillo, Sonora, Mexico, 4-8 May 2011; The carbon cycle science community has organized a global network, called FLUXNET, to measure the exchange of energy, water, and carbon dioxide (CO2) between the ecosystems and the atmosphere using the eddy covariance technique. This network has provided unprecedented information for carbon cycle science and global climate change but is mostly represented by study sites in the United States and Europe. Thus, there is an important gap in measurements and understanding of ecosystem dynamics in other regions of the world that are seeing a rapid change in land use. Researchers met under the sponsorship of Red Temática de Ecosistemas and Consejo Nacional de Ciencia y Tecnologia (CONACYT) to discuss strategies to establish a Mexican eddy covariance network (MexFlux) by identifying researchers, study sites, and scientific goals. During the meeting, attendees noted that 10 study sites have been established in Mexico with more than 30 combined years of information. Study sites span from new sites installed during 2011 to others with 9 to 6 years of measurements. Sites with the longest span measurements are located in Baja California Sur (established by Walter Oechel in 2002) and Sonora (established by Christopher Watts in 2005); both are semiarid ecosystems. MexFlux sites represent a variety of ecosystem types, including Mediterranean and sarcocaulescent shrublands in Baja California; oak woodland, subtropical shrubland, tropical dry forest, and a grassland in Sonora; tropical dry forests in Jalisco and Yucatan; a managed grassland in San Luis Potosi; and a managed pine forest in Hidalgo. Sites are maintained with an individual researcher's funds from Mexican government agencies (e.g., CONACYT) and international collaborations, but no coordinated funding exists for a long-term program.

    14. Operational forecasting of daily temperatures in the Valencia Region. Part II: minimum temperatures in winter.

      NASA Astrophysics Data System (ADS)

      Gómez, I.; Estrela, M.

      2009-09-01

      Extreme temperature events have a great impact on human society. Knowledge of minimum temperatures during winter is very useful for both the general public and organisations whose workers have to operate in the open, e.g. railways, roadways, tourism, etc. Moreover, winter minimum temperatures are considered a parameter of interest and concern since persistent cold-waves can affect areas as diverse as public health, energy consumption, etc. Thus, an accurate forecasting of these temperatures could help to predict cold-wave conditions and permit the implementation of strategies aimed at minimizing the negative effects that low temperatures have on human health. The aim of this work is to evaluate the skill of the RAMS model in determining daily minimum temperatures during winter over the Valencia Region. For this, we have used the real-time configuration of this model currently running at the CEAM Foundation. To carry out the model verification process, we have analysed not only the global behaviour of the model for the whole Valencia Region, but also its behaviour for the individual stations distributed within this area. The study has been performed for the winter forecast period from 1 December 2007 - 31 March 2008. The results obtained are encouraging and indicate a good agreement between the observed and simulated minimum temperatures. Moreover, the model captures quite well the temperatures in the extreme cold episodes. Acknowledgement. This work was supported by "GRACCIE" (CSD2007-00067, Programa Consolider-Ingenio 2010), by the Spanish Ministerio de Educación y Ciencia, contract number CGL2005-03386/CLI, and by the Regional Government of Valencia Conselleria de Sanitat, contract "Simulación de las olas de calor e invasiones de frío y su regionalización en la Comunidad Valenciana" ("Heat wave and cold invasion simulation and their regionalization at Valencia Region"). The CEAM Foundation is supported by the Generalitat Valenciana and BANCAIXA (Valencia

    15. Diagnosis of digestive functional disease by the statistics of continuous monitoring of esophageal acidity

      NASA Astrophysics Data System (ADS)

      Rivera Landa, Rogelio; Cardenas Cardenas, Eduardo; Fossion, Ruben; Pérez Zepeda, Mario Ulises

      2014-11-01

      Technological advances in the last few decennia allow the monitoring of many physiological observables in a continuous way, which in physics is called a "time series". The best studied physiological time series is that of the heart rhythm, which can be derived from an electrocardiogram (ECG). Studies have shown that a healthy heart is characterized by a complex time series and high heart rate variability (HRV). In adverse conditions, the cardiac time series degenerates towards randomness (as seen in, e.g., fibrillation) or rigidity (as seen in, e.g., ageing), both corresponding to a loss of HRV as described by, e.g., Golberger et. al [1]. Cardiac and digestive rhythms are regulated by the autonomous nervous system (ANS), that consists of two antagonistic branches, the orthosympathetic branch (ONS) that accelerates the cardiac rhythm but decelerates the digestive system, and the parasympathetic brand (PNS) that works in the opposite way. Because of this reason, one might expect that the statistics of gastro-esophageal time series, as described by Gardner et. al. [2,3], reflects the health state of the digestive system in a similar way as HRV in the cardiac case, described by Minocha et. al. In the present project, we apply statistical methods derived from HRV analysis to time series of esophageal acidity (24h pHmetry). The study is realized on data from a large patient population from the Instituto Nacional de Ciencias Médicas y Nutrición Salvador Zubirán. Our focus is on patients with functional disease (symptoms but no anatomical damage). We find that traditional statistical approaches (e.g. Fourier spectral analysis) are unable to distinguish between different degenerations of the digestive system, such as gastric esophageal reflux disease (GERD) or functional gastrointestinal disorder (FGID).

    16. Spectroscopic Evidence for SN 2010ma Associated with GRB 101219B

      NASA Astrophysics Data System (ADS)

      Sparre, M.; Sollerman, J.; Fynbo, J. P. U.; Malesani, D.; Goldoni, P.; de Ugarte Postigo, A.; Covino, S.; D'Elia, V.; Flores, H.; Hammer, F.; Hjorth, J.; Jakobsson, P.; Kaper, L.; Leloudas, G.; Levan, A. J.; Milvang-Jensen, B.; Schulze, S.; Tagliaferri, G.; Tanvir, N. R.; Watson, D. J.; Wiersema, K.; Wijers, R. A. M. J.

      2011-07-01

      We report on the spectroscopic detection of supernova SN 2010ma associated with the long gamma-ray burst GRB 101219B. We observed the optical counterpart of the GRB on three nights with the X-shooter spectrograph at the Very Large Telescope. From weak absorption lines, we measure a redshift of z = 0.55. The first-epoch UV-near-infrared afterglow spectrum, taken 11.6 hr after the burst, is well fit by a power law consistent with the slope of the X-ray spectrum. The second- and third-epoch spectra (obtained 16.4 and 36.7 days after the burst), however, display clear bumps closely resembling those of the broad-lined type-Ic SN 1998bw if placed at z = 0.55. Apart from demonstrating that spectroscopic SN signatures can be observed for GRBs at these large distances, our discovery makes a step forward in establishing a general connection between GRBs and SNe. In fact, unlike most previous unambiguous GRB-associated SNe, GRB 101219B has a large gamma-ray energy (E iso = 4.2 × 1051 erg), a bright afterglow, and obeys the "Amati" relation, thus being fully consistent with the cosmological population of GRBs. Based on observations collected at the European Organisation for Astronomical Research in the Southern Hemisphere, Chile, under program 086.A-0073(B). 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), Ministério da Ciência e Tecnologia (Brazil), and Ministerio de Ciencia, Tecnología e Innovacón Productiva (Argentina).

    17. Polarized Light Imaging of the HD 142527 Transition Disk with the Gemini Planet Imager: Dust around the Close-in Companion

      NASA Astrophysics Data System (ADS)

      Rodigas, Timothy J.; Follette, Katherine B.; Weinberger, Alycia; Close, Laird; Hines, Dean C.

      2014-08-01

      When giant planets form, they grow by accreting gas and dust. HD 142527 is a young star that offers a scaled-up view of this process. It has a broad, asymmetric ring of gas and dust beyond ~100 AU and a wide inner gap. Within the gap, a low-mass stellar companion orbits the primary star at just ~12 AU, and both the primary and secondary are accreting gas. In an attempt to directly detect the dusty counterpart to this accreted gas, we have observed HD 142527 with the Gemini Planet Imager in polarized light at Y band (0.95-1.14 μm). We clearly detect the companion in total intensity and show that its position and photometry are generally consistent with the expected values. We also detect a point source in polarized light that may be spatially separated by ~ a few AU from the location of the companion in total intensity. This suggests that dust is likely falling onto or orbiting the companion. Given the possible contribution of scattered light from this dust to previously reported photometry of the companion, the current mass limits should be viewed as upper limits only. If the dust near the companion is eventually confirmed to be spatially separated, this system would resemble a scaled-up version of the young planetary system inside the gap of the transition disk around LkCa 15. 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), the Australian Research Council (Australia), Ministrio da Cincia, Tecnologia e Inovao (Brazil), and Ministerio de Ciencia, Tecnologa e Innovacin Productiva (Argentina).

    18. 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).

    19. Gemini Frontier Fields: Wide-field Adaptive Optics Ks-band Imaging of the Galaxy Clusters MACS J0416.1-2403 and Abell 2744

      NASA Astrophysics Data System (ADS)

      Schirmer, M.; Carrasco, E. R.; Pessev, P.; Garrel, V.; Winge, C.; Neichel, B.; Vidal, F.

      2015-04-01

      We have observed two of the six Frontier Fields galaxy clusters, MACS J0416.1-2403 and Abell 2744, using the Gemini Multi-Conjugate Adaptive Optics System (GeMS) and the Gemini South Adaptive Optics Imager (GSAOI). With 0.″ 08-0.″ 10 FWHM our data are nearly diffraction-limited over a 100\\prime\\prime × 100\\prime\\prime wide area. GeMS/GSAOI complements the Hubble Space Telescope (HST) redwards of 1.6 μm with twice the angular resolution. We reach a 5σ depth of {{K}s}˜ 25.6 mag (AB) for compact sources. In this paper, we describe the observations, data processing, and initial public data release. We provide fully calibrated, co-added images matching the native GSAOI pixel scale as well as the larger plate scales of the HST release, adding to the legacy value of the Frontier Fields. Our work demonstrates that even for fields at high galactic latitude where natural guide stars are rare, current multi-conjugated adaptive optics technology at 8 m telescopes has opened a new window on the distant universe. Observations of a third Frontier Field, Abell 370, are planned. 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, Tecnologia e Inovação (Brazil) and Ministerio de Ciencia, Tecnología e Innovación Productiva (Argentina). Based on observations made with ESO Telescopes at the La Silla and Paranal Observatories, Chile.

    20. Witnessing Gas Mixing in the Metal Distribution of the Hickson Compact Group HCG 31

      NASA Astrophysics Data System (ADS)

      Torres-Flores, S.; Mendes de Oliveira, C.; Amram, P.; Alfaro-Cuello, M.; Carrasco, E. R.; de Mello, D. F.

      2015-01-01

      We present for the first time direct evidence that in a merger of disk galaxies, the pre-existing central metallicities will mix as a result of gas being transported in the merger interface region along the line that joins the two coalescing nuclei. This is shown using detailed two-dimensional kinematics as well as metallicity measurements for the nearby ongoing merger in the center of the compact group HCG 31. We focus on the emission line gas, which is extensive in the system. The two coalescing cores display similar oxygen abundances. While in between the two nuclei, the metallicity changes smoothly from one nucleus to the other indicating a mix of metals in this region, which is confirmed by the high-resolution Hα kinematics (R = 45,900). This nearby system is especially important because it involves the merging of two fairly low-mass and clumpy galaxies (LMC-like galaxies), making it an important system for comparison with high-redshift galaxies. 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) - Observing run: GS-2012B-Q-60.

    1. BEGIRA: Basque Educational Gate for Interactive and Remote Astronomy

      NASA Astrophysics Data System (ADS)

      Gorosabel, J.; Sánchez-Lavega, A.; Pérez Hoyos, S.; Hueso, R.

      2015-05-01

      The BEGIRA project consists in making available the 1.23 m Calar Alto (CAHA) telescope to students of the University of the Basque Country (UPV/EHU). The project is designed in such a way that undergraduate and graduate students of the Máster oficial en ciencia y tecnología espacial of the UPV/EHU can control remotely the 1.23 m CAHA telescope. The instrument used is the DLR camera, which based on its large field of view and high sensitivity, allows observations ranging from nearby solar system bodies to remote gamma-ray bursts. The students are also responsible of reducing and analyzing the resultant DLR data. The observations are conducted from the Aula Espazio Gela located at the Faculty of Engineering at Bilbao. The students can control remotely i) the 1.23 m telescope, ii) the DLR camera and iii) the autoguider. They have also continuous access to the observatory weather station, webcams, astrometric tools and the CAHA archive, so they can actually see in real-time what they are doing. The operations can be visualized by two light cannons which display the telescope and camera controls for the audience. In case of any emergency the students are backed up by the CAHA staff. The BEGIRA project shows the potential that remote control of professional telescopes has for educational purposes. As proven by the several discoveries carried out under BEGIRA, the educational activities can be complemented with cutting-edge research activities carried out by Master Students. In the coming years we plan to continue with the BEGIRA project. More information can be found at http://www.ehu.es/aula-espazio/begira/.

    2. Gemini-IFU Spectroscopy of HH 111

      NASA Astrophysics Data System (ADS)

      Cerqueira, A. H.; Vasconcelos, M. J.; Raga, A. C.; Feitosa, J.; Plana, H.

      2015-03-01

      We present new optical observations of the Herbig-Haro (HH) 111 jet using the Gemini Multi Object Spectrograph in its Integral Field Unit mode. Eight fields of 5\\prime\\prime × 3\\buildrel{\\prime\\prime}\\over{.} 5 have been positioned along and across the HH 111 jet, covering the spatial region from knot E to L in HH 111 (namely, knots E, F, G, H, J, K, and L). We present images and velocity channel maps for the [O i] 6300+6360, Hα, [N ii] 6548+6583, and [S ii] 6716+6730 lines, as well as for the [S ii] 6716/6730 line ratio. We find that the HH 111 jet has an inner region with lower excitation and higher radial velocity, surrounded by a broader region of higher excitation and lower radial velocity. Also, we find higher electron densities at lower radial velocities. These results imply that the HH 111 jet has a fast, axial region with lower velocity shocks surrounded by a lower velocity sheath with higher velocity shocks. 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, Tecnologia e Inovação (Brazil), and Ministerio de Ciencia, Tecnología e Innovación Productiva (Argentina).

    3. Time Delay Measurements for the Cluster-lensed Sextuple Quasar SDSS J2222+2745

      NASA Astrophysics Data System (ADS)

      Dahle, H.; Gladders, M. D.; Sharon, K.; Bayliss, M. B.; Rigby, J. R.

      2015-11-01

      We report first results from an ongoing monitoring campaign to measure time delays between the six images of the quasar SDSS J2222+2745, gravitationally lensed by a galaxy cluster. The time delay between A and B, the two most highly magnified images, is measured to be {τ }{{AB}}=47.7+/- 6.0 days (95% confidence interval), consistent with previous model predictions for this lens system. The strong intrinsic variability of the quasar also allows us to derive a time delay value of {τ }{{CA}}=722+/- 24 days between image C and A, in spite of modest overlap between their light curves in the current data set. Image C, which is predicted to lead all the other lensed quasar images, has undergone a sharp, monotonic flux increase of 60%-75% during 2014. A corresponding brightening is firmly predicted to occur in images A and B during 2016. The amplitude of this rise indicates that time delays involving all six known images in this system, including those of the demagnified central images D-F, will be obtainable from further ground-based monitoring of this system during the next few years. Based on observations made with the Nordic Optical Telescope, operated on the island of La Palma jointly by Denmark, Finland, Iceland, Norway, and Sweden, in the Spanish Observatorio del Roque de los Muchachos of the Instituto de Astrofisica de Canarias, and including observations obtained at the Gemini Observatory, which is operated by the Association of Universities for Research in Astronomy, Inc., under a cooperative agreement with the NSF on behalf of the Gemini partnership: the National Science Foundation (United States), the National Research Council (Canada), CONICYT (Chile), the Australian Research Council (Australia), Ministério da Ciência, Tecnologia e Inovação (Brazil) and Ministerio de Ciencia, Tecnologi´a e Innovación Productiva (Argentina).

    4. Linking The Universe To The Community: Students As Starry Messengers For IYA2009-Puerto Rico.

      NASA Astrophysics Data System (ADS)

      Pantoja, Carmen; Lebrón, M.

      2008-05-01

      This poster presents a project at Puerto Rico to establish a working team of undergraduate students (Starry Messengers) to promote and experience the wonders of space science and education with all the senses. The students are expected to assist during the activities of the International Year of Astronomy 2009 (IYA2009). During 2008 the students will receive the appropriate instruction on observational astronomy through two workshops. These workshops follow the active learning model and therefore prepare students for outreach activities in astronomy. An innovative model of inclusion will be developed, adapting all the activities and material to include blind or visually impaired. We will encourage the participation of at least one visually impaired student or teacher on the Starry Messengers team. The greatest challenge in this project will be to develop adequate accessible activities in astronomy. The workshops will be held at the Arecibo Observatory and "El Parque de las Ciencias" Planetarium. These two centers have the facilities to develop the workshops and have the adequate settings for the participants to gain experience with astronomy research and outreach. This project targets underrepresented groups in science and engineering: hispanic students and students with visual impairments. The inquiry-based learning activities and material designed as part of the program will also be made available to the public to further promote excellence in astronomy. The workshops will serve as templates for future K-12 teacher workshops. This work has been funded by the NASA IDEAS-ER program. We would like to acknowledge the support from the Arecibo Observatory. The Arecibo Observatory is part of the National Astronomy and Ionospheric Center, which is operated by Cornell University under a Cooperative agreement with the National Science Foundation.

    5. Frequency and Intensity of drought events over Ebro River basin

      NASA Astrophysics Data System (ADS)

      Valencia, J. L.; Saa-Requejo, A.; Gascó, J. M.; Tarquis, A. M.

      2012-04-01

      Lately, several researchers have pointed out that climate change is expected to increase temperatures and lower rainfall in Mediterranean regions, simultaneously increasing the intensity of extreme rainfall events. These changes could have consequences regarding rainfall regime, erosion, sediment transport and water quality, soil management, and new designs in diversion ditches. Climate change is expected to result in increasingly unpredictable and variable rainfall, in amount and timing, changing seasonal patterns and increasing the frequency of extreme weather events. Consequently, the evolution of frequency and intensity of drought periods is of most important as in agro-ecosystems many processes will be affected by them. Realising the complex and important consequences of an increasing frequency of extreme droughts at the Ebro River basin, our aim is to study the evolution of drought events at this site statistically, with emphasis on the occurrence and intensity of them. For this purpose, fourteen meteorological stations were selected based on the length of the rainfall series and the climatic classification to obtain a representative untreated dataset from the river basin. Daily rainfall series from 1957 to 2002 were obtained from each meteorological station and no-rain period frequency as the consecutive numbers of days were extracted. Based on this data, we study changes in the probability distribution in several sub-periods. Moreover we used the Standardized Precipitation Index (SPI) for identification of drought events in a year scale and then we use this index to fit log-linear models to the contingency tables between the SPI index and the sub-periods, this adjusted is carried out with the help of ANOVA inference. Funding provided by ENESA, under projects P030225764 and P070225564, and by Spanish Ministerio de Ciencia e Innovación (MICINN) through project no. AGL2010-21501/AGR is greatly appreciated.

    6. Haffner 16: A Young Moving Group in the Making

      NASA Astrophysics Data System (ADS)

      Davidge, T. J.; Carrasco, Eleazar R.; Winge, Claudia; Pessev, Peter; Neichel, Benoit; Vidal, Fabrice; Rigaut, Francois

      2013-10-01

      The photometric properties of main sequence (MS) and pre-main sequence (PMS) stars in the young cluster Haffner 16 are examined using images recorded with the Gemini South Adaptive Optics Imager (GSAOI) and corrected for atmospheric blurring by the Gemini Multi-Conjugate Adapative Optics System (GeMS). A rich population of PMS stars is identified, and comparisons with isochrones suggest an age lsim10 Myr, assuming a distance modulus of 13.5 (D = 5 kpc). This age is consistent with that estimated from the lower cutoff of the MS on the K-band luminosity function and is ~2 Myr younger than the age found from bright MS stars at visible wavelengths. When compared with the solar neighborhood, Haffner 16 is roughly a factor of 2 deficient in objects with subsolar masses. PMS objects in the cluster are also more uniformly distributed on the sky than bright MS stars. It is suggested that Haffner 16 is dynamically evolved and that it is shedding protostars with subsolar masses. Young low mass clusters like Haffner 16 are one possible source of PMS stars in the field. The cluster will probably evolve on time scales of ~100-1000 Myr into a diffuse moving group with a mass function that is very different from that which prevailed early in its life. 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), the Australian Research Council (Australia), Ministério da Ciência, Tecnologia e Inovação (Brazil), and Ministerio de Ciencia, Tecnología e Innovación Productiva (Argentina).

    7. 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).

    8. Simultaneous K- and L-band Spectroscopy of Be Stars: Circumstellar Envelope Properties from Hydrogen Emission Lines

      NASA Astrophysics Data System (ADS)

      Granada, A.; Arias, M. L.; Cidale, L. S.

      2010-05-01

      We present medium-resolution K- and L-band spectra of a sample of eight Be stars, obtained with Gemini/NIRI. The IR K and L bands contain many lines of different hydrogen series that are used as a diagnosis to the physical conditions in the circumstellar environments. We make an analysis on the optical depths of the line-forming regions based on the intensity ratios of Pfγ and Brα lines, the behavior of Humphreys' series, and the fluxes of Brα and Brγ lines. All our targets show spectroscopic and photometric long-term variability; thus, time-resolved K- and L-band spectroscopy is an ideal tool for studying the structure and evolution of the innermost regions of the envelope and to test models on the disk-forming mechanism. We note that the instrumental configuration used allowed us to obtain good quality IR observations and to take profit of Gemini band 3 observing time (allocation time for ranked programs in which the observing conditions are relaxed). 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 (USA), the Science and Technology Facilities Council (UK), 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).

    9. Direct Evidence for an Enhancement of Helium in Giant Stars in Omega Centauri

      NASA Astrophysics Data System (ADS)

      Dupree, A. K.; Strader, Jay; Smith, Graeme H.

      2011-02-01

      The double main sequence identified in the globular cluster Omega Centauri has been interpreted using isochrones to indicate a large variation in the abundance of helium. If true, a helium enhancement carries strong implications for the chemical and stellar evolutionary history of this cluster. However, only indirect measures currently support this conjecture. We report the discovery of a variation in the line strength of the near-infrared He I 10830 Å transition in 12 similar red giants in Omega Centauri observed with PHOENIX on Gemini-S. Abundances of these stars derived from Magellan/MIKE spectra taken at the Las Campanas Observatory show that the helium transition is not detected in the most metal-poor population ([Fe/H] < -1.8), yet is present in the majority of stars with [Fe/H] >= -1.8. These observations give the first direct evidence for an enhancement of helium in Omega Centauri. The appearance of helium appears better correlated with increased [Al/Fe] and [Na/Fe] abundances than as a function of [Fe/H], giving observational support to the presence of high-temperature H burning in a prior generation of stars. Data presented herein were 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). This paper also includes spectra gathered with the 6.5 m Magellan Telescope/CLAY located at Las Campanas Observatory, Chile.

    10. Star formation in H I tails: HCG 92, HCG 100 and six interacting systems

      NASA Astrophysics Data System (ADS)

      de Mello, D. F.; Urrutia-Viscarra, F.; Mendes de Oliveira, C.; Torres-Flores, S.; Carrasco, E. R.; Cypriano, E.

      2012-11-01

      We present new Gemini spectra of 14 new objects found within the H I tails of Hickson Compact Groups (HCGs) 92 and 100. Nine of them are Galaxy Evolution Explorer (GALEX) far-ultraviolet (FUV) and near-ultraviolet (NUV) sources. The spectra confirm that these objects are members of the compact groups and have metallicities close to solar, with an average value of 12+log(O/H) ˜ 8.5. They have average FUV luminosities 7 × 1040 erg s-1 and very young ages (<100 Myr), and two of them resemble tidal dwarf galaxy (TDG) candidates. We suggest that they were created within gas clouds that were ejected during galaxy-galaxy interactions into the intergalactic medium, which would explain the high metallicities of the objects, inherited from the parent galaxies from which the gas originated. We conduct a search for similar objects in six interacting systems with extended H I tails: NGC 2623, NGC 3079, NGC 3359, NGC 3627, NGC 3718 and NGC 4656. We found 35 ultraviolet (UV) sources with ages < 100 Myr; however, most of them are on average less luminous/massive than the UV sources found around HCG 92 and HCG 100. We speculate that this might be an environmental effect and that compact groups of galaxies are more favourable to TDG formation than other interacting systems. 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 National Science Foundation (NSF) on behalf of the Gemini partnership: the NSF (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, Tecnologia e Innovacion Productiva (Argentina) - Observing run ID: GN-2003A-Q-53 and GN-2007B-Q-87.

    11. GeMS in the Outer Galaxy: Near-infrared Imaging of Three Young Clusters at Large Galactic Radii

      NASA Astrophysics Data System (ADS)

      Davidge, T. J.

      2014-02-01

      Images recorded with the Gemini South Adaptive Optics Imager (GSAOI) and corrected for atmospheric seeing by the Gemini Multi-conjugate Adaptive Optics System are used to investigate the stellar contents of the young outer Galactic disk clusters Haffner 17, NGC 2401, and NGC 3105. Ages estimated from the faint end of the main sequence (MS) and the ridgeline of the pre-main sequence on the (K, J - K) color-magnitude diagrams are consistent with published values that are based on the MS turnoff, with the GSAOI data favoring the younger end of the age range for NGC 2401 in the literature. The mass function (MF) of NGC 2401 is similar to that in the solar neighborhood, and stars spanning a wide range of masses in this cluster have similar clustering properties on the sky. It is concluded that NGC 2401 is not evolved dynamically. In contrast, the MF of Haffner 17 differs significantly from that in the solar neighborhood over all masses covered by these data, while the MF of NGC 3105 is deficient in objects with sub-solar masses when compared with the solar neighborhood. Low-mass objects in Haffner 17 and NGC 3105 are also more uniformly distributed on the sky than brighter, more massive, MS stars. This is consistent with both clusters having experienced significant dynamical evolution. 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), the Australian Research Council (Australia), Ministério da Ciência, Tecnologia e Inovação (Brazil), and Ministerio de Ciencia, Tecnología e Innovación Productiva (Argentina).

    12. The Abundance Scatter in M33 from H II Regions: Is There Any Evidence for Azimuthal Metallicity Variations?

      NASA Astrophysics Data System (ADS)

      Bresolin, Fabio

      2011-04-01

      Optical spectra of 25 H II regions in the inner 2 kpc of the M33 disk have been obtained with the Gemini Multi-Object Spectrograph at the Gemini North telescope. The oxygen abundance gradient measured from the detection of the [O III] λ4363 auroral line displays a scatter of approximately 0.06 dex, a much smaller value than recently reported by Rosolowsky & Simon in this galaxy. The analysis of the abundances for a large sample of H II regions derived from the R 23 strong-line indicator confirms that the scatter is small over the full disk of M33, consistent with the measuring uncertainties, and comparable to what is observed in other spiral galaxies. No evidence is therefore found for significant azimuthal variations in the present-day metallicity of the interstellar medium in this galaxy on spatial scales from ~100 pc to a few kpc. A considerable fraction of M33 H II regions with auroral line detections show spectral features revealing sources of hard ionizing radiation (such as He II emission and large [Ne III], [O III] line fluxes). Since R 23 is shown to severely underestimate the oxygen abundances in such cases, care must be taken in chemical abundance studies of extragalactic H II regions based on this strong-line indicator. 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).

    13. Variation of soil surface roughness under simulated rainfall

      NASA Astrophysics Data System (ADS)

      Tarquis, A. M.; Saa-Requejo, A.; Valencia, J. L.; Moratiel, R.; Paz-Gonzalez, A.

      2012-04-01

      Soil surface micro-topography or roughness (SSR) defines the physical boundary between overland flow and soil. Due to its unique position, soil roughness potentially affects surface processes such as infiltration, flow routing, erosion and sedimentation. Thus the decay of SSR under different rainfall intensities is of most interest in soil erosion. While some authors have chosen exponent function of cumulative rainfall to describe the decay of SSR, others have used the kinetic energy of rainfall. SSR at the field level is an easy visually perceptible notion, but difficult to describe numerically. In this study we didn't use pin-meter or laser techniques to quantify SSR. Percentage of micro-topographic shadows, under fixed sunlight conditions, has been applied based on former works that proved it is an easy and reliable method to estimate SSR. Two experimental plots, of 1m x 1m, were subjected to successive simulated rainfall events with an intensity of 67 mm/h and a height of 2 m. Both plots were a harrowed plot with an oriented roughness and 6% slope. Images were obtained each 15 minutes of rainfall with an incident angle of light of 45° approximately. The image was acquired by an OLYMPUS X-925, having a size of 2976x3968 pixels and corresponding to an area of 75 cm x 100 cm. For denoising process, the image was cropped to 590x800 pixels and for image binarization Indicator Kriging (IK) method was used. Comparisons of both plots respect to SSR evolution, runoff accumulation and shadows morphology are showed. Acknowledgements Funding provided by Spanish Ministerio de Ciencia e Innovación (MICINN) through project no. AGL2010-21501/AGR is greatly appreciated.

    14. Origin Of The Near-earth Asteroid Phaethon And The Geminids Meteor Shower

      NASA Astrophysics Data System (ADS)

      de Leon, Julia; Campins, H.; Tsiganis, K.; Morbidelli, A.; Licandro, J.

      2010-10-01

      Asteroid (3200) Phaethon is a remarkable Near Earth Asteroid (NEA). It was the first asteroid associated with a meteor shower, namely the Geminid stream1. Phaethon's unusual orbit has a high inclination and a very low perihelion distance (0.14 AU). Its reflectance spectrum suggests a connection with primitive meteorites, best fitting with CI/CM carbonaceous chondrites2, aqueously altered and rich in hydrated silicates. However, its origin is not well determined. Recent studies suggest a connection with the population of main-belt comets3, classifying Phaethon as an activated asteroid. Here we show that the most likely source of Phaethon and the Geminids is the asteroid (2) Pallas, one of the largest asteroids in the main belt, which is surrounded by a collisional family, containing several Phaethon-sized objects. Pallas’ highly inclined orbit and surface composition, also primitive and with evidence of hydration4, support this connection. Our analysis reveals a striking similarity between Phaethon's visual spectrum and those of Pallas family members. Moreover, our numerical simulations show the existence of a robust dynamical pathway, connecting the orbital neighborhood of Pallas with that of Phaethon. In this respect, the Pallas family may constitute a source of primitive NEAs. (The author gratefully acknowledges support from the Spanish "Ministerio de Ciencia e Innovación" projects AYA2005-07808-C03-02 and AYA2008-06202-C03-02.) References 1. Whipple, F. L. 1983, IAU Circular, 3881 2. Licandro, J., Campins, H., Mothe-Diniz, T., Pinilla-Alonso, N. & de Leon, J. 2007, Astron. Astrophys. 461, 751-757 3. Hsieh, H. H., & Jewitt, D. 2006, Science, 312, 561-563 4. Rivkin, A. S., Howell, E. S., Vilas, F. & Lebofsky, L. A. in Asteroids III (eds Bottke, W. F., Cellino, A., Paolicchi, P. & Binzel, R. P.) 235-253 (Univ. Arizona Press, 2002).

    15. Robust regression applied to fractal/multifractal analysis.

      NASA Astrophysics Data System (ADS)

      Portilla, F.; Valencia, J. L.; Tarquis, A. M.; Saa-Requejo, A.

      2012-04-01

      Fractal and multifractal are concepts that have grown increasingly popular in recent years in the soil analysis, along with the development of fractal models. One of the common steps is to calculate the slope of a linear fit commonly using least squares method. This shouldn't be a special problem, however, in many situations using experimental data the researcher has to select the range of scales at which is going to work neglecting the rest of points to achieve the best linearity that in this type of analysis is necessary. Robust regression is a form of regression analysis designed to circumvent some limitations of traditional parametric and non-parametric methods. In this method we don't have to assume that the outlier point is simply an extreme observation drawn from the tail of a normal distribution not compromising the validity of the regression results. In this work we have evaluated the capacity of robust regression to select the points in the experimental data used trying to avoid subjective choices. Based on this analysis we have developed a new work methodology that implies two basic steps: • Evaluation of the improvement of linear fitting when consecutive points are eliminated based on R p-value. In this way we consider the implications of reducing the number of points. • Evaluation of the significance of slope difference between fitting with the two extremes points and fitted with the available points. We compare the results applying this methodology and the common used least squares one. The data selected for these comparisons are coming from experimental soil roughness transect and simulated based on middle point displacement method adding tendencies and noise. The results are discussed indicating the advantages and disadvantages of each methodology. Acknowledgements Funding provided by CEIGRAM (Research Centre for the Management of Agricultural and Environmental Risks) and by Spanish Ministerio de Ciencia e Innovación (MICINN) through project no

    16. The Gemini NICI Planet-finding Campaign: Discovery of a Close Substellar Companion to the Young Debris Disk Star PZ Tel

      NASA Astrophysics Data System (ADS)

      Biller, Beth A.; Liu, Michael C.; Wahhaj, Zahed; Nielsen, Eric L.; Close, Laird M.; Dupuy, Trent J.; Hayward, Thomas L.; Burrows, Adam; Chun, Mark; Ftaclas, Christ; Clarke, Fraser; Hartung, Markus; Males, Jared; Reid, I. Neill; Shkolnik, Evgenya L.; Skemer, Andrew; Tecza, Matthias; Thatte, Niranjan; Alencar, Silvia H. P.; Artymowicz, Pawel; Boss, Alan; de Gouveia Dal Pino, Elisabete; Gregorio-Hetem, Jane; Ida, Shigeru; Kuchner, Marc J.; Lin, Douglas; Toomey, Douglas

      2010-09-01

      We report the discovery of a tight substellar companion to the young solar analog PZ Tel, a member of the β Pic moving group observed with high-contrast adaptive optics imaging as part of the Gemini Near-Infrared Coronagraphic Imager Planet-Finding Campaign. The companion was detected at a projected separation of 16.4 ± 1.0 AU (0farcs33 ± 0farcs01) in 2009 April. Second-epoch observations in 2010 May demonstrate that the companion is physically associated and shows significant orbital motion. Monte Carlo modeling constrains the orbit of PZ Tel B to eccentricities >0.6. The near-IR colors of PZ Tel B indicate a spectral type of M7 ± 2 and thus this object will be a new benchmark companion for studies of ultracool, low-gravity photospheres. Adopting an age of 12+8 -4 Myr for the system, we estimate a mass of 36 ± 6 M Jup based on the Lyon/DUSTY evolutionary models. PZ Tel B is one of the few young substellar companions directly imaged at orbital separations similar to those of giant planets in our own solar system. Additionally, the primary star PZ Tel A shows a 70 μm emission excess, evidence for a significant quantity of circumstellar dust that has not been disrupted by the orbital motion of the companion. 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).

    17. Revisiting the Abundance Gradient in the Maser Host Galaxy NGC 4258

      NASA Astrophysics Data System (ADS)

      Bresolin, Fabio

      2011-03-01

      New spectroscopic observations of 36 H II regions in NGC 4258 obtained with the Gemini telescope are combined with existing data from the literature to measure the radial oxygen abundance gradient in this galaxy. The [O III]λ4363 auroral line was detected in four of the outermost targets (17-22 kpc from the galaxy center), allowing a determination of the electron temperature Te of the ionized gas. From the use of different calibrations of the R 23 abundance indicator, an oxygen abundance gradient of approximately -0.012 ± 0.002 dex kpc-1 is derived. Such a shallow gradient, combined with the difference in the distance moduli measured from the Cepheid period-luminosity relation by Macri et al. between two distinct fields in NGC 4258, would yield an unrealistically strong effect of metallicity on the Cepheid distances. This strengthens the suggestion that systematic biases might affect the Cepheid distance of the outer field. Evidence for a similar effect in the differential study of M33 by Scowcroft et al. is presented. A revision of the transformation between strong-line and Te -based abundances in Cepheid-host galaxies is discussed. In the Te abundance scale, the oxygen abundance of the inner field of NGC 4258 is found to be comparable with the LMC value. 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).

    18. Analysis of soil images applying Laplacian Pyramidal techniques

      NASA Astrophysics Data System (ADS)

      Ballesteros, F.; de Castro, J.; Tarquis, A. M.; Méndez, A.

      2012-04-01

      The Laplacian pyramid is a technique for image encoding in which local operators of many scales but identical shape are the basis functions. Our work describes some properties of the filters of the Laplacian pyramid. Specially, we pay attention to Gaussian and fractal behaviour of these filters, and we determine the normal and fractal ranges in the case of single parameter filters, while studying the influence of these filters in soil image processing. One usual property of any image is that neighboring pixels are highly correlated. This property makes inefficient to represent the image directly in terms of the pixel values, because most of the encoded information would be redundant. Burt and Adelson designed a technique, named Laplacian pyramid, for removing image correlation which combines features of predictive and transform methods. This technique is non causal, and its computations are simple and local. The predicted value for each pixel is computed as a local weighted average, using a unimodal weighting function centred on the pixel itself. Pyramid construction is equivalent to convolving the original image with a set of weighting functions determined by a parameter that defines the filter. According to the parameter values, these filters have a behaviour that goes from the Gaussian shape to the fractal. Previous works only analyze Gaussian filters, but we determine the Gaussian and fractal intervals and study the energy of the Laplacian pyramid images according to the filter types. The different behaviour, qualitatively, involves a significant change in statistical characteristics at different levels of iteration, especially the fractal case, which can highlight specific information from the images. Funding provided by Spanish Ministerio de Ciencia e Innovación (MICINN) through project no. AGL2010-21501/AGR is greatly appreciated.

    19. Subsystems in Nearby Solar-type Wide Binaries

      NASA Astrophysics Data System (ADS)

      Tokovinin, Andrei; Hartung, Markus; Hayward, Thomas L.

      2010-08-01

      We conducted a deep survey of resolved subsystems among wide binaries with solar-type components within 67 pc of the Sun. Images of 61 stars in the K and H bands were obtained with the Near-Infrared Coronagraphic Imager adaptive-optics instrument on the 8 m Gemini-South telescope. Our maximum detectable magnitude difference is about 5 mag and 7.8 mag at 0farcs15 and 0farcs9 separations, respectively. This enables a complete census of subsystems with stellar companions in the projected separation range from 5 to 100 AU. Out of seven such companions found in our sample, only one was previously known. We determine that the fraction of subsystems with projected separations above 5 AU is 0.12 ± 0.04 and that the distribution of their mass ratio is flat, with a power-law index of 0.2 ± 0.5. Comparing this with the properties of closer spectroscopic subsystems (separations below 1 AU), it appears that the mass-ratio distribution does not depend on the separation. The frequency of subsystems in the separation ranges below 1 AU and between 5 and 100 AU is similar, about 0.15. Unbiased statistics of multiplicity higher than 2, advanced by this work, provide constraints on star formation theory. Based on observations obtained at the Gemini Observatory (Program ID GS-2009B-Q-49), which is operated by the Association of Universities for Research in Astronomy, Inc., under a cooperative agreement with the National Science Foundation 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).

    20. 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

    1. 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

    2. 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

    3. 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

    4. 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

    5. 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

    6. 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

    7. 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

    8. Coordination of NEO Observers in South-America

      NASA Astrophysics Data System (ADS)

      Tancredi, G.

      At present the discovery of NEOs is concentrated in the Northern Hemisphere. None of the 6 existing survey programs can reach declinations below -30deg. Nevertheless, there are two small surveys ready to start in the near future in the southern hemisphere: an extension of the Catalina Sky Survey using the Uppsala Schmidt in Siding Spring and the Project BUSCA in Uruguay. Many of the NEOs discovered by the northern surveys could reach the southern sky, with declinations unreachable for a northern observer. Furthermore, the recovery of an asteroid in subsequent oppositions could come indistinctly in the northern and southern sky. A network of well-equipped observers in the southern region is then a must in a campaign to catalog the NEO population. In view of this situation, the Planetary Society, through its NEO grant, have already supported many observers in the Southern Hemisphere. The planetary science community in South America has considerably grown in the last 10 years. We have well-known research groups in Argentina, Brazil and Uruguay. Those groups have established many scientific links by exchanging graduate students and through several meetings. In particular, we have already hold two Workshop in Planetary Science in South America in 1999 (La Plata, Argentina) and 2000 (Montevideo, Uruguay) with more than 25 participants each. Recently, in February 2002, we organized a Workshop of NEO observers in Montevideo with the participation of more than 20 professional and amateurs observers from: Argentina: Obs. Ast. Felix Aguilar - Yale University (San Juan) and CRICYT (Mendoza); Brazil: Obs. Abraes de Moraes (San Pablo), Obs. Wykrota (Belo Horizonte) and Observatorio Nacional (Rio de Janeiro); Paraguay: Obs. Nacional de Asuncion and Sociedad de Estudios Astronómicos (Asunción) Uruguay: Depto. Astronomía - Fac. Ciencias, Obs. Ast. Los Molinos and Obs. Kappa Crucis (Montevideo). Among the resolutions of the Workshop, we highlight: * Creation of the "Asociaci

    9. PREFACE: The IX Mexican Workshop on Particles and Fields

      NASA Astrophysics Data System (ADS)

      Amore, Paolo; Aranda, Alfredo; Bashir, Adnan; Mondragón, Myriam; Raya, Alfredo

      2006-05-01

      The IX Mexican Workshop on Particles and Fields was held in the beautiful city of Colima, in the South-West of Mexico, from 17-22 November 2003. The proceedings of the Workshop were delayed due to problems with a previous publisher, we are very grateful that Journal of Physics: Conference Series kindly agreed to publish the proceedings rapidly at this late stage. The Workshop aimed to cover, through invited lectures delivered by internationally known experts, the most recent developments in the field. There was also a series of short seminars as well as a poster session, which allowed the whole community to participate with their most recent research results. A special session was dedicated to awarding the Division Medal to Professor Benjamin Grinstein, from The University of California, San Diego, for his outstanding contributions to the field. This volume contains the written version of the material presented at the Workshop. The Workshop was attended by more than 100 participants, including faculty members, postdocs and graduate students. It was organized by the Particles and Fields Division of the Mexican Physical Society, and generously sponsored by several institutions: Universidad de Colima, Universidad Nacional Autónoma de México, Universidad Michoacana de San Nicolás Hidalgo, Centro de Investigaciones y Estudios Avanzados del IPN (CINVESTAV), Consejo Nacional de Ciencia y Tecnología (Conacyt). The Local Organizing Committee was integrated by Paolo Amore, Alfredo Aranda, Carlos Moisés Hernóndez Suórez (Director of the Physics Faculty), Arturo Gonzólez Larios, Enrique Farías Martínez, and Myriam Cruz Calvario, all from the University of Colima. The members of the National Organizing Committee were Adnan Bashir (IFM-UMSHN), Jens Erler (IF-UNAM), Heriberto Castilla Valdés (CINVESTAV-U.Zacatenco), Gabriel López Castro (CINVESTAV-U.Zacatenco), Myriam Mondragón (IF-UNAM) and Luis Villaseñ or (IFM-UMSHN). We gratefully acknowledge the help given by

    10. Evolution of Fractal Parameters through Development Stage of Soil Crust

      NASA Astrophysics Data System (ADS)

      Ospina, Abelardo; Florentino, Adriana; Tarquis, Ana Maria

      2016-04-01

      ). REFERENCES Karperien, A. (2013). FracLac for ImageJ. Méndoza, B., Florentino, A., Hernández-Hernández, R.M., Aciego, J., Torres, D. and Vera, Elena. (2013). Biological attributes of two Quibor soils with addition of organic fertilizer and salt solutions. Revista Mexicana de Ciencias Agrícolas, 4(3), 409-421. Ospina, Abelardo, Adriana Florentino and Ana M. Tarquis (2015) Spatial Pattern of Biological Soil Crust with Fractal Geometry. Geophysical Research Abstracts, 17, EGU2015-15415-1 Toledo, V. and Florentino, A. (2009). The Microbiotic Crust On Soil. Revista de Investigación N° 68(33), 199-216.

    11. The Reflective Abstraction Theory and the History of Astronomy. (Spanish Title: La Teoría de la Abstracción Reflexionante y la Historia de la Astronomía.) A Teoria da Abstração Reflexionante e a História da Astronomia.

      NASA Astrophysics Data System (ADS)

      Chiesa Bartelmebs, Roberta; Batista Siqueira Harres, João; da Silva, João Alberto

      2014-12-01

      This work is presented as a theoretical essay on some facts from the history of astronomy analyzed according to the theory of reflective abstraction developed by Jean Piaget and collaborators (1970). Its aim is to understand the reasons that led to different astronomers, at the same historical period and culture, to "see" quite different evidences about the same phenomenon. In addition, we intend to facilitate the understanding of science as a human construction, subject to a time epoch and the ways of understanding of each scientist. Este trabajo se presenta como un ensayo teórico sobre algunos hechos históricos de la astronomía, analizados según la teoría de la abstracción reflexionante de Jean Piaget y sus colaboradores (1970). Se trata de comprender los motivos que llevaran a distintos astrónomos, de una misma época histórica y cultural, a "ver" diferentes evidencias sobre un mismo fenómeno. Además, se intenta posibilitar la comprensión de la ciencia como construcción humana, la cual es condicionada por su momento histórico y por las creencias y las formas de entender de los científicos. Este trabalho configura-se como um ensaio teórico a respeito de alguns fatos da história da astronomia analisados segundo a teoria da abstração reflexionante elaborada por Jean Piaget e seus colaboradores (1970). Trata-se de compreender os motivos que levaram diferentes astrônomos, da mesma época histórica e cultural, a "enxergarem" evidências tão diferentes sobre um mesmo fenômeno. Além disso, pretendemos possibilitar a compreensão das Ciências como construção humana, condicionadas a uma época e às crenças e os modos de compreender de cada cientista.

    12. Three-Dimensional Numerical Modeling of Crustal Growth at Active Continental Margins

      NASA Astrophysics Data System (ADS)

      Zhu, G.; Gerya, T.; Tackley, P. J.

      2011-12-01

      the finger-like plumes. We demonstrate the potential applicability of our model to clustering of arc magmatism in several subduction zones, such as Baja California (Ramos-Velázquez et al., Revista Mexicana de Ciencias Geológicas,2008), North Island of New Zealand (Booden et al., J. Volcanol. Geotherm. Res., 2010), Northeast Japan (Kimura and Yoshida,Journal of Petrology, 2006); Ecuador (Schütte et al., Tectonophysics,2010) and Lesser Antilles (Labanieh et al., EPSL,2010).

    13. On the Formation of a Study Group to the Realization of Workshops for Teachers: Astronomy in Basic Education in Umuarama-Pr (Spanish Title: De la Formación de un Grupo de Estudios a la Realización de los Talleres Para los Profesores: la Astronomía en la Educación Básica en Umuarama-Pr ) Da Formação de um Grupo de Estudos À Realização de Oficinas Para Professores: a Astronomia na Educação Básica em Umuarama-Pr

      NASA Astrophysics Data System (ADS)

      Belusso, Diane; Akira Sakai, Otávio

      2013-12-01

      In this article, we aimed to present the activities developed by the Astronomy Study Group (ASG) to contribute to the dissemination and improvement of the astronomy teaching-learning. The results of a research carried out in schools of Umuarama-PR are shown, with the intention of checking the students' knowledge and interest in relation to Astronomy. It is reported the realization of workshops for Science teachers linked to the Education Regional Nucleus. The research and the workshop execution promoted the direct contact of the study group with the community; the results were used to diagnose the state of astronomy teaching-learning, in the basic education in Umuarama-PR. En este artículo se intenta presentar las actividades desarrolladas por el Grupo de Estudios de Astronomía (GEA) y contribuir para la divulgación y mejoría de la enseñanza-aprendizaje de la Astronomía. Se presentan los resultados de una investigación realizada en las escuelas de Umuarama-PR, con la intención de determinar el grado de conocimiento y el interés de los estudiantes en relación a la astronomía. Se relata la realización de talleres de capacitación para los profesores de ciencias vinculados al Núcleo Regional del Educación. La ejecución de la investigación y de los talleres promovió el contacto directo del grupo de estudios con la comunidad; los resultados sirvieron de diagnóstico de la enseñanza aprendizaje de la astronomía en la educación básica en Umuarama-PR. Neste artigo, objetiva-se apresentar as atividades desenvolvidas pelo Grupo de Estudos de Astronomia (GEA) e contribuir para a divulgação e melhoria do ensino-aprendizagem de astronomia. São apresentados os resultados de uma pesquisa realizada nas escolas de Umuarama-PR, com o intuito de averiguar o conhecimento e o interesse dos estudantes em relação à astronomia. Relata-se a realização de oficinas de capacitação para professores de ciências vinculados ao Núcleo Regional de Educação. A

    14. Extreme seasonal droughts and floods in Amazonia: causes, trends and impacts

      NASA Astrophysics Data System (ADS)

      Marengo, J. A.

      2015-12-01

      J. A. Marengo * and J. C. Espinoza** * Centro Nacional de Monitoramento e Alerta de Desastres Naturais, Ministério da Ciência, Tecnologia e Inovação, Sao Paulo, Brazil ** Subdirección de Ciencias de la Atmósfera e Hidrósfera (SCAH), Instituto Geofísico del Perú, Lima, Peru This paper reviews recent progress in the study and understanding of extreme seasonal events in the Amazon region, focusing on drought and floods. The review includes a history of droughts and floods in the past, in the present and some discussions on future extremes in the context of climate change and its impacts on the Amazon region. Several extreme hydrological events, some of them characterized as 'once in a century', have been reported in the Amazon region during the last decade. While abundant rainfall in various sectors of the basin has determined extreme floods along the river's main stem in 1953, 1989, 1999, 2009, 2012-2015, deficient rainfall in 1912, 1926, 1963, 1980, 1983, 1995, 1997, 1998, 2005 and 2010 has caused anomalously low river levels, and an increase in the risk and number of fires in the region, with consequences for humans. This is consistent with changes in the variability of the hydrometeorology of the basin and suggests that extreme hydrological events have been more frequent in the last two decades. Some of these intense/reduced rainfalls and subsequent floods/droughts were associated (but not exclusively) with La Niña/El Niño events. In addition, moisture transport anomalies from the tropical Atlantic into Amazonia, and from northern to southern Amazonia alter the water cycle in the region year-to-year. We also assess the impacts of such extremes on natural and human systems in the region, considering ecological, economic and societal impacts in urban and rural areas, particularly during the recent decades. In the context of the future climate change, studies show a large range of uncertainty, but suggest that drought might intensify through the 21st

    15. PREFACE: FLUIDOS 2010: XI Meeting on Recent Advances in the Physics of Fluids and their Applications

      NASA Astrophysics Data System (ADS)

      Bove, Italo; Cabeza, Cecilia; Martí, Arturo C.; Sarasúa, Gustavo

      2011-04-01

      The papers published in this volume of the Journal of Physics: Conference Series were selected from the manuscripts submitted to the XI Meeting on Recent Advances in the Physics of Fluids and their Applications (FLUIDOS2010), which was held in Colonia del Sacramento, Uruguay, 3-5 November 2010. FLUIDOS takes place every two years, usually in November, with the aim of gathering together researchers from all areas of the Physics of Fluids, to update themselves on the latest technical developments and applications, share knowledge and stimulate new ideas. This 11th meeting continues the successful experience of the previous ones which were held in different Argentinian cities. For the first time, the meeting was celebrated in Uruguay, more specifically, in the peaceful town of Colonia del Sacramento, designated a World Heritage Site by UNESCO. The conference presented an outstanding program of papers covering the most recent advances in Physics of Fluids in the following areas: General Fluid Dynamics General and non-Newtonian Flows Magnetohydrodynamics Electrohydrodynamics and Plasmas Hydraulics, Thermohydraulics and Multiple Phase Flows A website with full details of the conference program, abstracts and other information can be found at http://fluidos2010.fisica.edu.uy. We would like to thank all the participants, especially those who contributed with talks, posters and manuscripts, for making FLUDOS2010 such a successful conference. Our thanks also go to our colleagues for their support and encouragement, particularly in the refereeing of papers. We would like to acknowledge additional financial support from Comisión Sectorial de Investigación Científica (Universidad de la República, Uruguay), Programa de Desarrollo de las Ciencias Básicas (Uruguay) and the Centro Latinoamericano de Física (CLAF). Our thanks are extended to the local government of Colonia del Sacramento. The next FLUIDOS conference will be held in November 2013, in Buenos Aires, Argentina. We

    16. Evolution of the Sedimentary Basin Within the Eastern Eez Polygon at the Gulf of Mexico

      NASA Astrophysics Data System (ADS)

      Valle, S.; Mortera-Gutierrez, C. A.; Bandy, W. L.; Escobar-Briones, E. G.; Perez, D. A.

      2013-05-01

      This study shows the seafloor structures and magnetic anomalies inside the eastern EEZ polygon at the Gulf of Mexico. The objective of this study is to examine the previous hypothesis of the Gulf of Mexico opening, based on the seafloor magnetic character. Researchers from the "Instituto de Ciencias del Mar y Limnología" at UNAM, collected , multibeam bathymetric data, high-resolution seismic reflection and magnetic profiles along 37 E-W transects during two campaigns on board the UNAM vessel, BO JUSTO SIERRA, SIGSBEE-11 in 2008 and SIGSBEE-13 in 2010. Results of the bathymetry data gathered with the EM300 multibeam echo sounder (Kongsberg) and processed with the software Caraibes from IFREMER has generated a bathymetry chart of seafloor at the Eastern Polygon, and a mosaic of back-scattering images. The high-resolution seismic profiles gathered with the subbottom profiler TOPAS PS-18 (Kongsberg) provide information on the stratigraphy sediment packages across this polygon and across the deep Mississippi Canyon. The magnetic anomalies are reduced from the data gathered with a proton-precession magnetometer, G877 (GEOMETRICS). The anomalies are modeled, based on a N_S rift at the Gulf central sector. The bathymetric chart and reflectivity mosaics of SIGSBEE-11 and SIGSBEE-13 documented the smooth relief of the seabed slope toward the Gulf central sector and abrupt morphological features associated to the meanders of the Mississippi Canyon that trend to the East. The multibeam bathymetry chart shows a relief depth that goes from 2,900 to 3,400 m from north to south. Meanders are observed in the seabed within the Eastern Polygon which is related to turbidity currents from the Mississippi River, and having a trend from west to east. The relief of the canyon shows channels with widths between 400 and 1800 m, and canyon depths up to 80 m. The high-resolution seismic sections, show well defined stratigraphy packages, where clear sediment strata are interrupted by

    17. Star formation history of Canis Major R1. I. Wide-Field X-ray study of the young stellar population

      NASA Astrophysics Data System (ADS)

      Gregorio-Hetem, J.; Montmerle, T.; Rodrigues, C. V.; Marciotto, E.; Preibisch, T.; Zinnecker, H.

      2009-11-01

      Aims: The CMa R1 star-forming region contains several compact clusters as well as many young early-B stars. It is associated with a well-known bright rimmed nebula, the nature of which is unclear (fossil HII region or supernova remnant). To help elucidate the nature of the nebula, our goal was to reconstruct the star-formation history of the CMa R1 region, including the previously unknown older, fainter low-mass stellar population, using X-rays. Methods: We analyzed images obtained with the ROSAT satellite, covering 5 sq. deg. Complementary VRI photometry was performed with the Gemini South telescope. Colour-magnitude and colour-colour diagrams were used in conjunction with pre-main sequence evolutionary tracks to derive the masses and ages of the X-ray sources. Results: The ROSAT images show two distinct clusters. One is associated with the known optical clusters near Z CMa, to which 40 members are added. The other, which we name the “GU CMa” cluster, is new, and contains 60 members. The ROSAT sources are young stars with masses down to M_star 0.5 M_⊙, and ages up to 10 Myr. The mass functions of the two clusters are similar, but the GU CMa cluster is older than the cluster around Z CMa by at least a few Myr. Also, the GU CMa cluster is away from any molecular cloud, implying that star formation must have ceased; on the contrary (as already known), star formation is very active in the Z CMa region. Based in part 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).

    18. Anthropometric traits, blood pressure, and dietary and physical exercise habits in health sciences students; the obesity observatory project.

      PubMed

      Gutiérrez-Salmeán, Gabriela; Meaney, Alejandra; Ocharán, M Esther; Araujo, Juan M; Ramírez-Sánchez, Israel; Olivares-Corichi, Ivonne M; García-Sánchez, Rubén; Castillo, Guadalupe; Méndez-Bolaina, Enrique; Meaney, Eduardo; Ceballos, Guillermo

      2013-01-01

      Introducción: La obesidad y el síndrome metabólico afectan a un segmento considerable de la población mundial, incluyendo a los profesionales de la salud. De hecho, diversos estudios han reportado que los médicos tienden a presentar más factores de riesgo cardiovascular que sus propios pacientes. El presente estudio transversal evaluó si los estudiantes del área de la salud tenían un estilo de vida más saludable y, por tanto, una mejor actitud en cuanto a la prevención de las enfermedades crónico-degenerativas, que el resto de la población. Materiales y métodos: Se encuestaron estudiantes del área medico-biológica a través de un cuestionario sobre antecedentes heredo-familiares de riesgo cardiovascular, consumo actual de tabaco y alcohol, así como hábitos alimentarios y de ejercicio físico. Se midió la presión arterial, el peos, la talla y la circunferencia abdominal. Resultados: 23.4% de los participantes presentaban sobrepeso y 10% obesidad. La obesidad paterna fue el factor de riesgo más frecuente, seguido de consumo social de alcohol y tabaquismo. Se encontró un alto consume de alimentos de origen animal, cereales industrializados y refrescos; por otra parte, se reportó un bajo consumo de verduras y frutas. Más de la mitad de la muestra refirió ser sedentario. Discusión y conclusiones: Se encontraron datos muy similares a aquéllos reportados sobre la población general, que eventualmente conducirán al desarrollo de enfermedades cardiometabólicas. Por tanto, es posible inferir que la educación biomédica no es eficiente en la inducción de un estilo de vida saludable entre los estudiantes de ciencias de la salud. Tal fenómeno podría impactar su práctica futura ya que probablemente se convertirán en profesionistas obesos, con la consecuente falla en la prevención primaria y secundaria de sus propios pacientes.

    19. GEMINI/GeMS Observations Unveil the Structure of the Heavily Obscured Globular Cluster Liller 1.

      NASA Astrophysics Data System (ADS)

      Saracino, S.; Dalessandro, E.; Ferraro, F. R.; Lanzoni, B.; Geisler, D.; Mauro, F.; Villanova, S.; Moni Bidin, C.; Miocchi, P.; Massari, D.

      2015-06-01

      Ciência, Tecnologia e Inovação (Brazil), and Ministerio de Ciencia, Tecnología e Innovación Productiva (Argentina). Based on observations gathered with the ESO-VISTA telescope (program ID 179.B-2002).

    20. Orbits and Pointing Strategies for Space-Based Telescopes into a European Space Surveillance System

      NASA Astrophysics Data System (ADS)

      Olmedo, Estrella; Sanchez-Ortiz, Noelia; Ramos-Lerate, Mercedes

      2009-03-01

      results presented in this paper are obtained during a project partially funded by the CDTI (Ministerio de Ciencia e Innovación -Spanish Government-).

    1. Parallel Computation of Orbit Determination for Space Debris Population

      NASA Astrophysics Data System (ADS)

      Olmedo, Estrella; Sanchez-Ortiz, Noelia; Ramos-Lerate, Mercedes

      2009-03-01

      its real IKCM is in agreement with that imposed) survive. Those ones that are far away of the real solution make SRIF to diverge and are skipped from the initial cloud. We will show numerical results and we will compare the accuracy with the numerical results obtained by applying directly the results of the IOD to the SRIF. Implementation of the algorithm in a cluster of PCs will also be addressed. The reported algorithm has been implemented in the Advanced Space Surveillance System simulator (AS4) and developed by DEIMOS Space. The project has been partially funded by the CDTI (Ministerio de Ciencia e Innovación (Spanish Government)).

    2. The distance to the Andromeda galaxy from eclipsing binaries

      NASA Astrophysics Data System (ADS)

      Vilardell, F.; Ribas, I.; Jordi, C.; Fitzpatrick, E. L.; Guinan, E. F.

      2010-01-01

      The cosmic distance scale largely depends on distance determinations to galaxies of the Local Group. In this sense, the Andromeda galaxy (M 31) is a key rung to better constrain the cosmic distance ladder. A project was started in 1999 to firmly establish a direct and accurate distance to M 31 using eclipsing binaries (EBs). After the determination of the first direct distance to M 31 from EBs, the second direct distance to an EB system is presented: M31V J00443610+4129194. Light and radial velocity curves were obtained and fitted to derive the masses and radii of the components. The acquired spectra were combined and disentangled to determine the temperature of the components. The analysis of the studied EB resulted in a distance determination to M 31 of (m-M)0 = 24.30 ± 0.11 mag. This result, when combined with the previous distance determination to M 31, results in a distance modulus of (m-M)0 = 24.36 ± 0.08 mag (744 ± 33 kpc), fully compatible with other distance determinations to M 31. With an error of only 4%, the obtained value firmly establishes the distance to this important galaxy and represents the fulfillment of the main goal of our project. Based on observations made with the Isaac Newton Telescope operated on the island of La Palma by the Isaac Newton Group in the Spanish Observatorio del Roque de los Muchachos of the Instituto de Astrofísica de Canarias.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)Original data are only available in

    3. Analysis of the Presence of Content about Astronomy in a Decade of the National High School Examination (1998-2008). (Spanish Title: Análisis de la Presencia de Contenidos de Astronomía em Uma Década del Examen Nacional de Enseñaza Secundária (1998-2008).) Análise da Presença de Conteúdos de Astronomia em Uma DÉcada do Exame Nacional do Ensino Médio (1998-2008)

      NASA Astrophysics Data System (ADS)

      Gomide, Hanny Angeles; Longhini, Marcos Daniel

      2011-07-01

      In this paper we analyzed the presence of contents of Astronomy in the National High School Examination (ENEM) in its first decade (1998-2008). We verified the number of questions addressing this topic that were present over the years, as well as the most recurrent subjects. We discussed the results from what is proposed by the official documents regarding the teaching of Astronomy in the Elementary and Secondary Education and we entertain future expectations about the presence of contents of this science in future official examinations. En este trabajo realizamos un análisis de la presencia de contenidos de Astronomía em las pruebas del Examen Nacional de Enseñanza Secundaria (ENEM) em su primera década de existência (1998-2008). Contabilizamos la cantidad de preguntas incluyendo este tema que estuvieron presentes en el transcurso de los años, así como los temas más recurrentes. Discutimos los resultados a partir de lo propuesto por los documentos oficiales en relación a la enseñanza de Astronomía en la Educación Básica y elaboramos algunos apuntes sobre futuras expectativas em relación a la presencia de contenidos de esta ciencia en examenes oficiales. No presente trabalho fizemos uma análise da presença de conteúdos de Astronomia nas provas do Exame Nacional do Ensino Médio (ENEM), em sua primeira década de existência (1998-2008). Verificamos a quantidade de questões envolvendo essa temática que estiveram presentes no decorrer dos anos, assim como os temas mais recorrentes. Discutimos os resultados a partir do que é proposto pelos documentos oficiais em relação ao ensino de Astronomia na Educação Básica e tecemos alguns apontamentos sobre a expectativa futura quanto à presença de conteúdos dessa ciência nesse exame oficial.

    4. The Stacked LYα Emission Profile from the Circum-Galactic Medium of z ∼ 2 Quasars

      NASA Astrophysics Data System (ADS)

      Arrigoni Battaia, Fabrizio; Hennawi, Joseph F.; Cantalupo, Sebastiano; Prochaska, J. Xavier

      2016-09-01

      agreement with the NSF on behalf of the Gemini partnership: the National Science Foundation (United States), the National Research Council (Canada), CONICYT (Chile), the Australian Research Council (Australia), Ministério da Ciência, Tecnologia e Inovação (Brazil), and Ministerio de Ciencia, Tecnología e Innovación Productiva (Argentina).

    5. Descripción del coronógrafo a ser instalado en Argentina (MICA)

      NASA Astrophysics Data System (ADS)

      Stenborg, G.; Francile, C.; Schwenn, R.; Epple, A.; Rovira, M.

      El ``Coronógrafo de espejo para Argentina'' es un telescopio solar terrestre a ser colocado en el Observatorio Astronómico Félix Aguilar (El Leoncito), antes de finalizar 1996, como parte de un programa de ciencia bilateral entre Alemania y Argentina. Eclipses fotográficos de alta resolución han revelado que la corona solar es altamente estructurada y variable. De hecho, está contínuamente deformada y moldeada por los movimientos convectivos de los extremos de los arcos magnéticos en la fotosfera, estando, en muchas oportunidades, afectada por explosivas liberaciones de energía. MICA, en conjunción con otros telescopios solares espaciales y terrestres, tratará de contribuir al entendimiento de cuestiones fundamentales de la física solar. Entre ellas: cómo la corona está siendo calentada, dónde y cómo el viento solar es acelerado, qué causa los transitorios coronales, etc. Para ello investigará la distribución de los parámetros del plasma y su evolución con el tiempo, la estructura espacial de la corona en fina y gran escala, procesos que ocurren en los transitorios coronales y factores que los disparan, etc. Para responder a estas cuestiones MICA observará la atmósfera solar por sobre el limbo entre 1.1 y 2 radios solares aproximadamente, usando un nuevo tipo de sistema coronográfico que permite suprimir el brillo del disco solar suficientemente bien, tomando las imágenes con una cámara CCD de 1024x1024 pixels, codificada en 12 bits, pudiendo el mismo ser operado en forma remota. En la presente exposición describiremos las características del instrumento, cómo será controlado y qué esperamos observar basados en las imágenes obtenidas por los telescopios de similares características LASCO C1 a bordo del SOHO y PICO (ubicado en el Observatorio de Pic du Midi, Francia).

    6. Recent KBO (Pluto/Charon and beyond, including Quaoar) Occultation Observations by the Williams College Team as part of the Williams-MIT Collaboration

      NASA Astrophysics Data System (ADS)

      Pasachoff, Jay M.; Babcock, B. A.; Davis, A. B.; Pandey, S.; Lu, M.; Rogosinski, Z.; Person, M. J.; Bosh, A. S.; Zangari, A. M.; Zuluaga, C. A.; Gulbis, A. S.; Naranjo, O.; Navas, G.; Zerpa, L.; Villarreal, J.; Rojo, P.; Förster, F.; Servajean, E.

      2013-10-01

      : support from FONDECYT through grant 3110042 and by the Millennium Center for Supernova Science, grant P10-064-F. funded by Programa Bicentenario de Ciencia y Tecnología de CONICYT and Programa Iniciativa Científíca Milenio de MIDEPLAN.

    7. [Latin American malacology. Freshwater mollusks from Argentina].

      PubMed

      Rumi, Alejandra; Gregoric, Diego E Gutiérrez; Núñez, Verónica; Darrigran, Gustavo A

      2008-03-01

      A report and an updated list with comments on the species of freshwater molluscs of Argentina which covers an area of 2 777 815 km2 is presented. Distributions of Gastropoda and Bivalvia families, endemic, exotic, invasive as well as entities of sanitary importance are also studied and recommendations on their conservation are provided. Molluscs related to the Del Plata Basin have been thoroughly studied in comparison to others areas of the country. This fauna exhibits relatively the biggest specific richness and keeps its affinity with the fauna of other regions of the basin in areas of Paraguay and Brasil. The 4 500 records of molluscs considered in this paper arise from the study of the collections of Museo Argentino de Ciencias Naturales "Bernardino Rivadavia", Buenos Aires; Museo de La Plata, La Plata and Fundación "Miguel Lillo", Tucumán. These institutions keep very important collections of molluscs in southern South America. Field information has recently been obtained and localities cited by other authors are also included in the data base. Until today, 166 species have been described, 101 belonging to 10 families of Gastropoda and 65 to 7 of Bivalvia. Families with highest specific richness are Lithoglyphidae (22) and Sphaeriidae (25), respectively. The number of endemic species (those present only in Argentina) by family is: Gastropoda: Ampullariidae (1), Cochliopidae (10), Lithoglyphidae (11), Thiariidae (3), Chilinidae (11), Lymnaeidae (2) and Physidae (2?); Bivalvia: Hyriidae (1?); Etheriidae (1?) and Sphaeriidae (10). Families with a distribution that comprise almost the whole country are: the Sphaeriidae and the gastropods Cochliopidae, Chilinidae and Lymnaeidae. Families Erodonidae and Solecurtidae (Bivalvia) were registered in mixohaline environments from Buenos Aires province. Gastropod families Thiaridae and Glacidorbiidae show a very restricted distribution. The rest of the families are present mainly in the center and north of the country

    8. KIC 9821622: An interesting lithium-rich giant in the Kepler field

      NASA Astrophysics Data System (ADS)

      Jofré, E.; Petrucci, R.; García, L.; Gómez, M.

      2015-12-01

      We report the discovery of a new exceptional young lithium-rich giant, KIC 9821622, in the Kepler field that exhibits an unusually large enhancement of α, Fe-peak, and r-process elements. From high-resolution spectra obtained with GRACES at Gemini North, we derived fundamental parameters and detailed chemical abundances of 23 elements from equivalent widths and synthesis analysis. By combining atmospheric stellar parameters with available asteroseismic data, we obtained the stellar mass, radius, and age. The data analysis reveals that KIC 9821622 is a Li-rich (A(Li)NLTE = 1.80 ± 0.2) intermediate-mass giant star (M = 1.64 M⊙) located at the red giant branch near the luminosity bump. We find unexpectedly elevated abundances of Fe-peak and r-process elements. In addition, as previously reported, we find that this is a young star (2.37 Gyr) with unusually high abundances of α-elements ([α/Fe] = 0.31). The evolutionary status of KIC 9821622 suggests that its Li-rich nature is the result of internal fresh Li that is synthesized through the Cameron-Fowler mechanism near the luminosity bump. However, its peculiar enhancement of α, Fe-peak, and r-process elements opens the possibility of external contamination by material enriched by a supernova explosion. Although it is less likely, planet accretion cannot be ruled out. 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), the Australian Research Council (Australia), Ministério da Ciência, Tecnologia e Inovação (Brazil) and Ministerio de Ciencia, Tecnología e Innovación Productiva (Argentina).Appendix A is available in electronic form at http://www.aanda.org

    9. Insertion of Astronomy as a High School Subject. (Spanish Title: Inserción de Astronomia Como Materia del Ciclo Secundario.) Inserção da Astronomia Como Disciplina Curricular do Ensino Médio

      NASA Astrophysics Data System (ADS)

      Dias, Claudio André C. M.; Santa Rita, Josué R.

      2008-12-01

      Astronomy is considered among the first sciences that man dominated, however, the basic skills for the construction of knowledge, relatively to the contents "Earth and the Universe" are not being developed properly for the majority of students concluding the high school level. The students are concluding this teaching cycle without proper knowledge of several subjects in the area of Astronomy, which are mandatory in the national Curricular National Parameters (PCN). Because of this discrepancy, this work stresses the need of the incorporation of a specific subject of Astronomy in the high school, in order to reduce the gap between what is taught and which should be taught. La Astronomía es considerada una de las primeras ciencias que el hombre dominó. Sin embargo, las habilidades básicas para la construcción del conocimento, relativo al eje temático "Tierra y Universo", no vienen siendo trabajadas adecuadamente con la mayoría de los alumnos que concluyen el ciclo escolar medio. Los alumnos están concluyendo este nivel de enseñanza sin conocimentos de varios temas en el área de Astronomía, que son obligatorios según los Parámetros Curriculares Nacionales (PCN). En virtud de esta discrepancia, este trabajo enfatiza la necesidad de incorporar una disciplina específica de Astronomía em el ciclo medio, em pro de la reducción de las distorsiones entre lo que es enseñado y lo que se debe enseñar. A Astronomia é considerada uma das primeiras ciências que o homem dominou, porém as competências básicas para a construção do conhecimento, relativo ao eixo temático "Terra e Universo", não vêm sendo trabalhadas a contento com a maioria dos alunos que concluem o ensino médio. Os alunos estão concluindo este nível de ensino sem conhecimento de vários temas na área de Astronomia, que são obrigatórios nos Parâmetros Curriculares Nacionais (PCN). Em virtude desta discrepância, este trabalho vem evidenciar a necessidade da incorporação de uma

    10. Astronomy Teaching and Teachers Continuing Education: the Interdisciplinarity during a Total Lunar Eclipse. (Spanish Title: Enseñanza de la Astronomía y la Formación Continua de Profesores: la Interdisciplinariedad Durante un Eclipse Total de Luna.) Educação EM Astronomia E Formação Continuada de Professores: a Interdisciplinaridade Durante um Eclipse Lunar TOTAL

      NASA Astrophysics Data System (ADS)

      Langhi, Rodolfo

      2009-07-01

      This paper describes how 67 teachers from 23 cities, could awaken, in students, the scientific interest, using a natural astronomical phenomenon: a total lunar eclipse. Before and after of eclipse, meetings for continuing education were characterized by interdisciplinarity of astronomy and the importance of these observations. Working groups were formed by teachers and students, who organized the survey data, mobilizing the people in their cities. The results point ways about how to provide the scientific culture and the motivation to learn science in students, using approaches between the following communities: scientific, amateur and school. En este artículo se describe cómo 67 profesores de 23 ciudades, despertó el interés científico en los estudiantes mediante un fenómeno astronómico: un eclipse total de Luna. Antes y después del eclipse, reuniones para la formación continua se centraron en la interdisciplinariedad de la astronomía, y la importancia de las observaciones de este tipo de fenómeno. Profesores y estudiantes formaron grupos de trabajo para investigar datos durante el eclipse, con el participación de la comunidad en sus ciudades. Los resultados apuntan a las opciones que conducen a la cultura científica y la motivación para aprender la ciencia, utilizando las relaciones de los siguientes grupos: científicos, aficionados y la escuela. Este texto relata como 67 professores, provenientes de 23 cidades, puderam despertar, nos alunos, o interesse científico utilizando um fenômeno natural astronômico: um eclipse lunar total. O evento foi precedido e procedido por encontros de formação continuada, onde se caracterizou a interdisciplinaridade da astronomia e a importância das observações de fenômenos como estes. Grupos de trabalho foram formados por professores e alunos, que se organizaram para o levantamento conjunto de dados durante o fenômeno, além do envolvimento da comunidade em suas respectivas cidades. Os resultados apontam

    11. An analysis of rainfall-runoff conversion in dry Mediterranean environments considering scale and connectivity

      NASA Astrophysics Data System (ADS)

      Pascual-Aguilar, Juan Antonio; Rubio, José Luis; Andreu, Vicente

      2010-05-01

      , although the importance of them will be different in each scale. Acknowledgments. The authors thank the Spanish Ministerio de Educación y Ciencia (Project Consolider CGL2006-11619/HID).

    12. MCNeil's Nebula in Orion: The Outburst History

      NASA Astrophysics Data System (ADS)

      Briceño, C.; Vivas, A. K.; Hernández, J.; Calvet, N.; Hartmann, L.; Megeath, T.; Berlind, P.; Calkins, M.; Hoyer, S.

      2004-05-01

      We present a sequence of I-band images obtained at the Venezuela 1 m Schmidt telescope during the outburst of the nebula recently discovered by J. W. McNeil in the Orion L1630 molecular cloud. We derive photometry spanning the preoutburst state and the brightening itself, which is a unique record including 14 epochs and spanning a timescale of ~5 years. We constrain the beginning of the outburst at some time between 2003 October 28 and November 15. The light curve of the object at the vertex of the nebula, the likely exciting source of the outburst, reveals that it has brightened ~5 mag in about 4 months. The timescale for the nebula to develop is consistent with the light-travel time, indicating that we are observing light from the central source scattered by the ambient cloud into the line of sight. We also show recent FLWO optical spectroscopy of the exciting source and of the nearby HH 22. The spectrum of the source is highly reddened; in contrast, the spectrum of HH 22 shows a shock spectrum superposed on a continuum, most likely the result of reflected light from the exciting source reaching the HH object through a much less reddened path. The blue portion of this spectrum is consistent with an early B spectral type, similar to the early outburst spectrum of the FU Orionis variable star V1057 Cygni; we estimate a luminosity of L~219 Lsolar. The eruptive behavior of McNeil's Nebula, its spectroscopic characteristics and luminosity, suggest that we may be witnessing an FU Ori event on its way to maximum. By further monitoring this object, we will be able decide whether or not it qualifies as a member of this rare class of objects. Based on observations obtained at the Llano del Hato National Astronomical Observatory of Venezuela, operated by CIDA for the Ministerio de Ciencia y Tecnología, and at the Fred Lawrence Whipple Observatory (FLWO) of the Smithsonian Institution.

    13. Nanosiderite is effective to alleviate iron chlorosis in sensitive plants growing on calcareous soils

      NASA Astrophysics Data System (ADS)

      Sánchez-Alcalá, I.; del Campillo, M. C.; Barrón, V.; Torrent, J.

      2012-04-01

      , siderite is readily prepared in the field, not easily leached from the soil and environmentally safe, thus constituting a good Fe fertilizer. Acknowledgments: This work was funded by the Spain's Ministerio de Ciencia e Innovación and the European Regional Development Fund (Projects AGL 2005-06691-C02-01 and AGL 2008-05053-C02-02).

    14. Comparison of NDVI fields obtained from different remote sensors

      NASA Astrophysics Data System (ADS)

      Escribano Rodriguez, Juan; Alonso, Carmelo; Tarquis, Ana Maria; Benito, Rosa Maria; Hernandez Díaz-Ambrona, Carlos

      2013-04-01

      reduced cost. By contranst, MODIS images present a much lower spatial resolution (500x500 m). The aim of this study is to establish a comparison between two different sensors in their NDVI values at different spatial resolutions. Acknowledgements. This work was partially supported by ENESA under project P10 0220C-823. Funding provided by Spanish Ministerio de Ciencia e Innovación (MICINN) through project no. MTM2009-14621 and i-MATH No. CSD2006-00032 is greatly appreciated.

    15. Pasture Drought Insurance Based on NDVI and SAVI

      NASA Astrophysics Data System (ADS)

      Escribano Rodríguez, J. A.; Tarquis, A. M.; Hernandez Díaz-Ambrona, C. G.

      2012-04-01

      obtaining Earth images with a good enough resolution to study the terrestrial vegetation cover (20x20 m), although with a great range of visual field (600 km) in order to obtain those images with high temporal resolution and at a reduced cost. It has 6 cameras in red, green and near infrared bands, equivalent to Landsat ones. A discussion on the correlations found between field measurements and both vegetation index considering seasonal pattern and location are presented. Acknowledgements. This work was partially supported by ENESA under project P10 0220C-823. Funding provided by Spanish Ministerio de Ciencia e Innovación (MICINN) through project no. AGL2010-21501/AGR is greatly appreciated.

    16. [Diet quality in college students with different academic profile].

      PubMed

      Pérez-Gallardo, Lucía; Mingo Gómez, Teresa; Bayona Marzo, Isabel; Ferrer Pascual, Ma Ángeles; Marquez Calle, Enrique; Rámirez Domínguez, Roberto; Navas Ferrer, Carlos; Navas Cámara, Francisco

      2015-05-01

      Introducción: En España son varios los estudios universitarios que abordan los temas de alimentación y estilo de vida, y demuestran que éstos son una estrategia eficaz para la prevención de enfermedades crónicas. Objetivos: Evaluar la ingesta de energía y nutrientes y la adhesión a la Dieta Mediterránea (DM) en un grupo de estudiantes universitarios con distinto perfil académico y comparar la calidad de la dieta entre estudiantes que cursan grados en Ciencias de la Salud (CS) y los de otras carreras (No CS). Métodos: 77 estudiantes (80,3% mujeres) del Campus de Soria, 37 de grados en CS y 40 de No CS de edad media 21,2 ± 2,1 años, cumplimentaron un cuestionario sobre datos socio-biográficos, el test KIDMED y registraron la ingesta de alimentos durante siete días. La estimación de la cantidad de energía y nutrientes se realizó mediante el programa informático NUTRIBER (versión 1.1.1.3r) y para la comparación de medias de muestras independientes se utilizaron las pruebas t de Student o U de Mann-Whitney y el criterio de significación se estableció en p < 0,05. Resultados y Discusión: Los estudiantes encuestados, con independencia de su perfil académico, siguen una dieta hipocalórica con mayor consumo de proteínas y de grasas de las recomendadas y menor de hidratos de carbono y fibra, lo que se refleja en el aporte insuficiente de algunas vitaminas y minerales. A pesar de ello, observamos un mayor porcentaje de encuestados con adhesión alta a los parámetros de la DM en el grupo CS (51,4%) que en el grupo no CS (30,8 %).

    17. [Effects of wine polyphenols on cancer prevention].

      PubMed

      Sancho, Marta; Mach, Núria

      2014-10-03

      Introducción: El cáncer se ha convertido en las últimas décadas en una de las principales causas de muerte en todo el mundo. La búsqueda para la prevención efectiva, se ha convertido en una prioridad para la ciencia básica y clínica. Los polifenoles del vino se han propuesto como terapia alternativa para inducir o mantener la remisión del cáncer. Objetivo: Revisar las evidencias científicas publicadas sobre el cáncer y la eficacia de la terapia con suplementos dietarios (especialmente polifenoles del vino). Material y métodos: Se ha realizado una extensa búsqueda de publicaciones científicas en las principales bases de datos electrónicas especializadas: NBCI, Elsevier, Scielo, Scirus y Science Direct. Resultados y Discusión: Se han reunido resultados de trabajos realizados in vitro y en animales de laboratorio en los que se pone de manifiesto el efecto de los polifenoles del vino (especialmente, el resveratrol) en el control de la apoptosis celular de diferentes tipos de cánceres mediante un aumento de las especies reactivas de oxígeno, así como también el retardo en el crecimiento de las mismas. El consumo de vino regular y moderado (uno o dos vasos al día) se asocia con la disminución de la incidencia de enfermedad cardiovascular, la hipertensión, la diabetes, y ciertos tipos de cáncer, como el de colon, el de mama, el de pulmón, o de próstata. Sin embargo, las evidencias científicas a cerca de los efectos protectores del resveratrol son insuficientes. Conclusiones:Los resultados publicados hasta la fecha referentes al rol de los polifenoles del vino en la prevención del cáncer contribuyen al mejor conocimiento y entendimiento de las modificaciones moleculares del cáncer. Los polifenoles del vino ha demostrado un papel significativo como antioxidante y prooxidante en el cáncer, aunque son necesarias más investigaciones en humanos.

    18. Remontant erosion in desert soils of Tamaulipas, México.

      NASA Astrophysics Data System (ADS)

      Rivera-Ortiz, P.; Andrade-Limas, E.; De la Garza-Requena, F.; Castro-Meza, B.

      2012-04-01

      REMONTANT EROSION IN DESERT SOILS OF TAMAULIPAS MÉXICO Rivera-Ortiz, P.1; Andrade-Limas, E.1; De la Garza-Requena, F.1 and Castro-Meza, B.1 1Facultad de Ingeniería y Ciencias, Universidad Autónoma de Tamaulipas, México The degradation of soil reduces the capacity of soils to produce food and sustain life. Erosion is one of the main types of soil degradation. Hydric erosion of remontant type can occur in soils located close to the channel of a river through the expansion of a gully that begins as a fluvial incision over the ravine of one side of the river. The incision takes place at the point of greatest flow of runoff from areas adjacent to empty into the river. The depth of the incision causes the growth of the gully by collapse to move their heads back, upstream. The soil loss by remontant erosion on land use in agriculture and livestock was estimated in order to understand the evolution of gullies formed by this type of erosion. Through measurements on satellite images and GPS (Global Positioning System) two gullies, developed on alluvial soils which drain into the river Chihue, were studied. The investigation was conducted during 2003 to 2010 period in the municipality of Jaumave, Tamaulipas, in northeastern Mexico. Soil loss in gullies developed by remontant erosion was large and it was caused by soil collapse and drag of soil on the headers. The estimated loss of soil by remontant erosion was 3500 t in the deeper gully during 2010 and nearly 1200 t per year in the period 2003-2009. New sections of gully of about 20 m length, with more than 3 m deep and up to 13 m wide, were formed each year. This degradation has significantly reduced the productive surface of soil that for many years has been used to the cultivation of maize (Zea mays) and beans (Phaseolus vulgaris) as well as pasture production.

    19. Ferromagnet / superconductor oxide superlattices

      NASA Astrophysics Data System (ADS)

      Santamaria, Jacobo

      2006-03-01

      Energy Sciences, contract No.W-31-109-ENG-38. ^1GFMC, Departamento de F'isica Aplicada III, Universidad Complutense de Madrid, 28040 Madrid, Spain ^2Instituto de Ciencia de Materiales de Madrid (ICMM-CSIC). 28049 Cantoblanco. Madrid. ^3Materials Science Division, Argonne National Laboratory, Argonne, Illinois 60439, USA ^4Condensed Matter Sciences Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831-6031, USA

    20. All-Manganite Tunnel Junctions with Interface-Induced Barrier Magnetism

      NASA Astrophysics Data System (ADS)

      Sefrioui, Zouhair

      2011-03-01

      The recent discovery of several unexpected phases at complex oxide interfaces is providing new insights into the physics of strongly correlated electron systems. The possibility of tailoring the electronic structure of such interfaces has triggered a great technological drive to functionalize them into devices. In this communication, we describe an alternative strategy to produce spin filtering by inducing a ferromagnetic insulating state in an ultrathin antiferromagnetic layer in contact with a ferromagnetic layer. This artificially induced spin filtering persists up to relatively high temperatures and operates at high applied bias voltages. The results suggest that after playing a key role in exchange-bias for spin-valves, uncompensated moments at engineered antiferromagnetic interfaces represent a novel route for generating highly spin-polarized currents with antiferromagnets. Work done in collaboration with M. Bibes, C. Carrétéro, A. Barthélémy (Unité Mixte de Physique CNRS/Thales, Campus de Polytechnique, 1, Avenue A. Fresnel, 91767 Palaiseau (France) and Université Paris-Sud, 91045 Orsay (France)), F.A. Cuellar, C. Visani, A. Rivera-Calzada, , C. León, J. Santamaria (Grupo de Física de Materiales Complejos, Universidad Complutense de Madrid, 28040 Madrid (Spain)), M.J. Calderón, L. Brey (Instituto de Ciencia de Materiales de Madrid, CSIC, Cantoblanco, 28049 Madrid (Spain)), K. March, M. Walls, D. Imhoff (Laboratoire de Physique des Solides, CNRS, Université Paris-Sud, 91405 Orsay (France)), R. Lopez Anton, T.R. Charlton (ISIS, Rutherford Appleton Laboratory, Chilton, Oxon OX11 0QX (United Kingdom)), E. Iborra (Universidad Politécnica de Madrid, Escuela Técnica Superior de Ingenieros de Telecomunicaciones, 28040 Madrid (Spain)), F. Ott (Léon Brillouin, CEA/CNRS, UMR 12, 91191 Gif-sur-Yvette (France)). This work was supported by the Spanish Ministry for Science and Education programs MAT2008 06517, and the Réseau Thématique de Recherche Avanc