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Sample records for ante una pandemia

  1. Wolbachia, una pandemia con posibilidades

    Directory of Open Access Journals (Sweden)

    Marcela S. RODRIGUERO

    2013-01-01

    Full Text Available La infección causada por Wolbachia es la más extendida entre los animales. La capacidad de esta bacteria para manipular la reproducción de sus hospedadores la posicionan en el centro de la biología de los organismos, influyendo en procesos tan capitales como la determinación del sexo, el ciclo celular, la formación y extinción de especies y el comportamiento de artrópodos entre los que se cuentan varias plagas y vectores de enfermedades. Cualidades tales como la herencia vertical de Wolbachia, la velocidad a la que se propaga en las poblaciones que afecta, la capacidad de bloquear la actividad patogénica de diversos microorganismos o de acortar el ciclo de vida de sus hospedadores la señalan como un potencial instrumento para el control de poblaciones de insec - tos y nematodos perjudiciales. ¿Cuáles son las posibilidades que nos ofrece esta pandemia? En la presente contribución se presenta una revisión de los aspectos fundamen - tales de esta infección y sus implicancias prácticas para el manejo de insectos plaga. Esta revisión está basada en el simposio del mismo nombre acontecido en el VIII Congreso Argentino de Entomología.

  2. Enfermedades laborales, una pandemia que requiere prevención

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    Joaquín Nieto

    2014-03-01

    Full Text Available Las enfermedades relacionadas con el trabajo constituyen una pandemias por la que cada año mueren 2.350.000 personas, de las que unas 340.000 se corresponden con accidentes de trabajo y el resto, unos 2.020.000 por enfermedad laboral, la mayor parte de ellas invisibles porque en muchas ocasiones ni se reconocen ni se registran. OIT se marca desde su nacimiento el principal objetivo de la mejora de las condiciones de trabajo El derecho a la salud y seguridad en el trabajo como principal compromiso, desarrollando normas internacionales para garantizar los derechos laborales en todo el mundo con el compromiso de mejorar el derecho a la salud y la seguridad en el trabajo. Así, de casi 200 convenios internacionales adoptados por la OIT, 40 van dedicados a esta materia, y desarrolla el Programa de Seguridad y Salud en el Trabajo y Medio Ambiente, SafeWork, al objeto de promover la conciencia mundial sobre la magnitud y las consecuencias de los accidentes, las lesiones y las enfermedades relacionadas con el trabajo. Afrontar el problema de las enfermedades laborales en España, requiere 5 líneas de actuación: 1 Desarrollo de normas, 2 contar con mecanismos y recursos humanos que permitan el cumplimiento de la normativa, 3 investigación, estudio y generar conocimiento, 4 cooperación entre Gobierno, empresa, sindicatos y trabajadores y 5 coherencia de políticas y adecuada colaboración entre las distintas Administraciones, principalmente de la Administración Laboral y Sanitaria.

  3. Cólera, ¿se aproxima una nueva pandemia?

    OpenAIRE

    Hernández-Flórez, Cristhian Eduardo; Cáceres-Manrique, Flor de María

    2014-01-01

    Introducción: el cólera es una enfermedad de origen bacteriano que ha causado epidemias, muerte y desolación desde los albores de la humanidad. Aún hoy, con todos los adelantos de las ciencias, sigue siendo una amenaza mortal para los seres humanos, en particular para quienes viven bajo condiciones de pobreza, con poco acceso al agua potable y a un adecuado manejo de excretas; de ahí su interés para la salud pública internacional. Metodología: se realizó una búsqueda virtual de boletines epid...

  4. HIV/AIDS: Teaching and learning of a pandemia = Aprendizaje basado en problemas, Docencia, SIDA, VIH VIH/SIDA: la enseñanza y el aprendizaje de una pandemia

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    Juan Carlos Cataño Correa

    2009-05-01

    Full Text Available The HIV/AIDS pandemic is still growing around the world, and the problem is equally serious in Colombia. This situation implies that general physicians, as well as all other professionals working with this specific population, should receive an adequate training to be able to diagnose and treat this potentially fatal disease before patients reach the advanced, irreversible stages. Throughout history, the role of teachers has evolved from an authoritarian model to being closer to their alumni; in the latter model students may find an easier identification with their teachers, acquire technical skills, and develop passion for knowledge; this goal is reached through several social, ethical, political and cultural competences that prepare alumni in an integral way.The small group didactics and the problem-based learning are useful tools in different pedagogic scenarios, but there is no precedent of their implementation in HIV/ AIDS teaching. For that reason, at the Medical Faculty, University of Antioquia, in Medellín, Colombia, we have adopted the ward round-based teaching methodology, that motivates alumni to think from a reflective position, preparing them for practicing in a milieu in which team work is the most important goal to reach. However, teachers keep their active role in decision-making.Students must achieve independence to take decisions focused on the search for knowledge and for the wellbeing of patients.La pandemia del VIH/SIDA sigue aumentando en el mundo y el problema no es menor en Colombia; por lo tanto, es urgente que el médico general y los profesionales de todas las disciplinas cuyos esfuerzos terapéuticos se enfocan sobre esta población reciban una adecuada formación para diagnosticar y tratar esta fatal enfermedad antes de que el paciente alcance sus estadios más avanzados en los que ya es irreversible.A lo largo de la historia ha ido cambiando el rol del maestro, pasando del que era autoritario hasta llegar al que es

  5. Respondiendo a una pandemia emergente: Zika y los métodos anticonceptivos como medida preventiva

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    Akram Hernández-Vásquez

    2017-01-01

    Full Text Available El virus del Zika ha ido expandiéndose rápidamente en América Latina y el Caribe. El Perú aún no reporta casos autóctonos, ambientales con los países afectados pueden establecer las condiciones adecuadas para la infección del Aedes aegypti, vector del virus del Zika y su posterior transmisión a los humanos, desencadenando una epidemia como la que sucedió con el virus del dengue en años anteriores. Además de la enfermedad febril aguda que el virus produce, la posible asociación con el incremento de casos de síndrome de Guillain-Barré en adultos, el aumento en la incidencia de microcefalia en recién nacidos, así como el reporte de la transmisión por vía sexual, han generado gran preocupación tanto en la población como en los decisores de la salud pública, a tal grado que la Organización Mundial de la Salud (OMS ha decretado alerta mundial…

  6. Pandemia de influenza: la respuesta de México

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    Kuri-Morales Pablo

    2006-01-01

    Full Text Available En 1992 apareció en el sureste asi��tico un nuevo tipo de virus de la influenza, el cual ha ocasionado hasta la fecha más de 120 casos y un poco más de 60 defunciones en humanos en Camboya, Vietnam, Indonesia y Tailandia. Esta situación es considerada por los expertos como la probable génesis de una nueva pandemia de influenza, lo que podría traer graves consecuencias para la salud de la población, así como para la economía y el comercio mundial. Por lo anterior, la Organización Mundial de la Salud (OMS ha instado a los países miembros a desarrollar planes de preparación y respuesta para hacer frente a esta eventualidad. En el marco del Comité Nacional para la Seguridad en Salud, México ha diseñado el Plan Nacional de Preparación y Respuesta ante una Pandemia de Influenza con objeto de proteger a la población mediante acciones efectivas y oportunas. El Plan utiliza una escala de riesgo y define cinco líneas de acción: Coordinación, Vigilancia Epidemiológica, Atención Médica, Difusión y Movilización Social, y Reserva Estratégica. Si bien es imposible predecir cuándo se presentará la próxima pandemia y su impacto, es fundamental que las autoridades de salud nacionales, estatales y locales establezcan los mecanismos para poner en marcha los componentes del Plan en forma oportuna y garantizar con ello la salud de la población en caso de influenza pandémica.

  7. LA JUNTA CENTRAL DE HIGIENE DE COLOMBIA, OTRA DE LAS VÍCTIMAS DE LA PANDEMIA DE GRIPA DE 1918-1919.

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    Abel Fernando Martínez Martín

    2014-12-01

    Full Text Available Objetivo: El presente artículo, a través de las fuentes primarias, busca establecer el papel del estado y las medidas tomadas ante la aparición de la pandemia de gripa de 1918 en Bogotá. Materiales y métodos: Se consultaron como fuentes primarias los periódicos que circulaban en Bogotá y Colombia durante 1918, los informes oficiales de la Junta Central de Higiene y de la Junta de Socorros y las tesis de medicina de la Universidad Nacional de Colombia. Además de hacer una revisión de las fuentes secundarias sobre el tema. Conclusión: La Higiene Pública, en manos del Estado, se mostró incapaz de hacer frente a la pandemia, siendo la Junta de Socorros, un organismo privado constituido por los notables de la capital, la única institución que realizó acciones efectivas con los afectados. Esta institución aparece recordada y alabada por los medios escritos, en contraposición a la Dirección Nacional y Municipal de Higiene, que fueron fuertemente criticadas por su escasa intervención ante la pandemia y representadas como víctimas en las caricaturas. Palabras Clave: Gripa 1918, Pandemia, Bogotá, Junta de Socorros, Junta Central de Higiene.

  8. La pandemia olvidada de 1918

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    Sergio González Bombardiere

    2007-08-01

    Full Text Available La pandemia de influenza del año 1918 causó más muertes que la Primera Guerra Mundial. El agente causal solo se identificó 20 años después y en la década de los 90, recién se conoció el tipo específico. El presente trabajo resume los hechos de 1918 y los esfuerzos posteriores para aclarar la causa de esta pandemia, por qué fue tan letal y si podría repetirse.

  9. Influenza. Vacunas clásicas y novedosas a las puertas de otra pandemia

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    Raiza Martínez

    2006-08-01

    Full Text Available Los virus de la influenza A, además del hombre, infectan otros mamíferos y una gran variedad de especies de aves. Desde 1997 se sabe que cepas aviares son capaces de infectar al hombre provocando una enfermedad generalmente leve. El brote actual de gripe aviar H5N1 en humanos ha puesto en alerta a la comunidad científica internacional, no solo por su elevada mortalidad sino por su potencialidad en la generación de una nueva pandemia. Las autoridades sanitarias han puesto en marcha un amplio programa para la preparación ante esta contingencia, que abarca diferentes campos, desde el diagnóstico y la detección precoz de los brotes tanto en animales como en humanos, la caracterización sistemática de las cepas circulantes, el sacrificio de aves infectadas, la producción masiva de antivirales y por supuesto el desarrollo y producción a gran escala de vacunas eficaces. En este último tema se trabaja intensamente tanto en el mejoramiento de las vacunas ya existentes como en la búsqueda de alternativas basadas en tecnologías de nueva generación.

  10. ACTIVIDADES DE VIGILANCIA EPIDEMIOLÓGICA DURANTE LA PANDEMIA DE GRIPE (H1N1 2009 EN ESPAÑA. REFLEXIONES UN AÑO DESPUÉS

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    Mª José Sierra Moros

    2010-01-01

    Full Text Available En este artículo se revisan las actuaciones llevadas a cabo en España en materia de vigilancia epidemiológica durante la pandemia de gripe y las recomendaciones de ellas derivadas en los diferentes momentos de la evolución de la misma. El funcionamiento del Subcomité de Vigilancia, contemplado en el Plan Nacional de Preparación y Respuesta ante una pandemia de gripe, fue clave para la coordinación de estas actividades de vigilancia. Este Subcomité se activó de forma inmediata tras la declaración de la alerta y su papel también se describe en este trabajo. La existencia del Plan permitió una respuesta rápida y coordinada tras la declaración de la alerta. La vigilancia epidemiológica y virológica de la gripe hubo de ir adaptándose a una situación cambiante, y se pusieron en marcha sistemas adicionales a los de la vigilancia habitual de la gripe, tales como la vigilancia individualizada de casos en la comunidad y de casos graves y mortales. Entre las lecciones aprendidas destacan la necesidad de fortalecer el análisis de los datos que se recogen durante una alerta, la necesidad de favorecer el intercambio de información entre los profesionales de salud pública y los asistenciales, y de reforzar la capacidad de respuesta para poder disponer de estructuras de salud pública fuertes y consolidadas ante futuras alertas sanitarias.

  11. Pandemia de influenza: la respuesta de México Influenza pandemic: Mexico's response

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    Pablo Kuri-Morales

    2006-02-01

    Full Text Available En 1992 apareció en el sureste asiático un nuevo tipo de virus de la influenza, el cual ha ocasionado hasta la fecha más de 120 casos y un poco más de 60 defunciones en humanos en Camboya, Vietnam, Indonesia y Tailandia. Esta situación es considerada por los expertos como la probable génesis de una nueva pandemia de influenza, lo que podría traer graves consecuencias para la salud de la población, así como para la economía y el comercio mundial. Por lo anterior, la Organización Mundial de la Salud (OMS ha instado a los países miembros a desarrollar planes de preparación y respuesta para hacer frente a esta eventualidad. En el marco del Comité Nacional para la Seguridad en Salud, México ha diseñado el Plan Nacional de Preparación y Respuesta ante una Pandemia de Influenza con objeto de proteger a la población mediante acciones efectivas y oportunas. El Plan utiliza una escala de riesgo y define cinco líneas de acción: Coordinación, Vigilancia Epidemiológica, Atención Médica, Difusión y Movilización Social, y Reserva Estratégica. Si bien es imposible predecir cuándo se presentará la próxima pandemia y su impacto, es fundamental que las autoridades de salud nacionales, estatales y locales establezcan los mecanismos para poner en marcha los componentes del Plan en forma oportuna y garantizar con ello la salud de la población en caso de influenza pandémica.In 1992, a new type of influenza virus appeared in Southeast Asia. This new strain has caused to date, more than 120 cases and over 60 deaths in Cambodia, Vietnam, Indonesia and Thailand. This situation is seen by the experts as the possible genesis of a new influenza pandemic with the corresponding negative effects on the health of the population, international commerce and world economy. In order to face the coming challenge, the World Health Organization (WHO has asked member countries to develop national preparedness and response plans for an influenza pandemic

  12. Antígonas. Una visión intertextual

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    Elena Cano Turrión

    2011-04-01

    Full Text Available In this article and from an intertextual point of view, we will try to examine how theSophoclean hypotext has generated three very different hypertexts. The first one is the short story“Antígona o la elección” by M. Yourcenar, which goes further the religious motivation in the originaltext; then, there is an essay written as a dialogue by Maria Zambrano, entitled La tumba de Antígonawhich main topics are confrontation against power, lack of freedom and destiny and faith in humanconscience. Finally, Luis Riaza’s Antígona…¡Cerda! Appears closer to its hypotext but at the same timesemantic deviation becomes more relevant.

  13. Solución de conectividad ante fallos para una red WAN empresarial

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    Martín Manjón-Cabeza, José María

    2014-01-01

    El proyecto propone una solución bajo demanda y de bajo coste para poder mantener la disponibilidad de las comunicaciones de las distintas sedes de una empresa hacia el resto de la WAN corporativa ante un fallo de alguno de sus enlaces principales de la WAN contratada a la operadora. El projecte proposa una solució a la carta i de baix cost per poder mantenir la disponibilitat de les comunicacions de les diferents seus d'una empresa cap a la resta de la WAN corporativa davant una fallida d...

  14. Formador de formadores ante los retos de una educación inclusiva

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    Luz Esperanza Bustos Sierra

    2010-02-01

    Full Text Available La importancia del conocimiento sobre el tema invita a evidenciar la formación de formadores ante los retos de una educación inclusiva, pretendiendo que responda a la búsqueda de concienciar a los educadores frente a las diferentes necesidades educativas, en pro de fortalecer una cultura democrática y de convivencia acorde a los desafíos del siglo XXI.

  15. ANT

    DEFF Research Database (Denmark)

    van der Duim, René; Ren, Carina Bregnholm; Jóhannesson, Gunnar Thór

    2017-01-01

    Ten years ago actor-network theory (ANT) entered this journal. To illustrate how the relational ontology and sensibilities of ANT lend themselves to particular kinds of research, we first interrogate the main controversies as a way to open up and discuss the main premises of ANT. These debates...... concern the status and agency of objects and non-humans, ANT’s denial of the explanatory power of social structures, and the political implications of ANT. Second we present ANT’s relevance for tourism studies and discuss what ANT ‘does’ in practice. After summarizing a decade of relations between ANT...... and tourism, we conclude by tracing three future trajectories of how we have ‘moved away with’ ANT into new areas of discovery....

  16. Otra vez y antes que nada. Una extensa serie de fotografías cuidadosamente clasificadas

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    Hernán Ascui Fernández

    2006-06-01

    Full Text Available Definitivamente, confiamos en la importancia y el significado que tiene un registro fotográfico como testimonio y memoria visual de una experiencia directa con la realidad. Por este convencimiento, nos hemos propuesto que la Revista Arquitecturas del Sur siempre comience con una serie de imágenes que desplieguen visualmente el resultado de una experiencia concreta sobre un tema específico de la arquitectura; es decir, de un tema explorado a través de un desplazamiento por un espacio. Este espacio puede corresponder al recorrido por una casa, un barrio, una ciudad, una calle o un camino.

  17. La ingesta de hidratos de carbono, antes, durante y después de una competencia deportiva

    OpenAIRE

    Abrines, María de la Candelaria

    2015-01-01

    Las competencias del running se realizan a lo largo del año y requieren de un cuidadoso plan nutricional que permita disponer de los nutrientes necesarios y recuperarlos al finalizarla. Objetivo: Determinar la ingesta de hidratos de carbono, antes, durante y después de una competencia deportiva, su adecuación a las recomendaciones y la recuperación de la fatiga post-competencia en corredores amateurs de 20 a 65 años de ambos sexos de la ciudad de Mar del Plata que participan de ...

  18. Los virus Influenza y la nueva pandemia A/H1N1

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    Miguel Talledo

    2011-07-01

    Full Text Available Los virus Influenza pertenecen a la familia Orthomyxoviridae, virus con genoma RNA de sentido negativo segmentado. Los virus influenza tipo A infectan a humanos y otros organismos, y son los agentes causantes de influenza en humanos. Resaltan entre sus principales proteínas la Hemaglutinina y la Neuraminidasa, que son utilizadas en la clasificación de los miembros de este grupo. Estos virus mutan continuamente, exhibiendo patrones muy estudiados, como el cambio y la deriva antigénica, siendo uno de los principales eventos de recombinación el reordenamiento. Todos los subtipos se encuentran en aves acuáticas silvestres, aunque se han encontrado otros hospederos, como equinos, visones, ballenas, focas, cerdos, gallinas y pavos, entre otros. Tanto las aves salvajes, las aves domésticas y el cerdo juegan un rol fundamental en la adaptación progresiva del virus al hospedero humano. Aunque los subtipos H2N2 y H3N2 han sido muy comunes, el subtipo H1N1 ha reemergido con mutaciones que le han permitido alcanzar el estado de pandemia en 2009. Este nuevo virus surge de un virus generado por triple reordenamiento con el virus humano, porcino norteamericano y aviar, conteniendo a su vez segmentos génicos de virus influenza porcina euroasiática. Esto ha hecho que el virus presente una enfermedad humana moderada y solamente severa y hasta letal en casos de individuos con condiciones médicas previas. A nivel mundial ha causado más de 134,510 casos y en el Perú alcanza cerca de 3,700 casos. El estado actual indica que la pandemia está por llegar a su pico máximo en el Perú, debido a la alta morbilidad del virus coincidente con la estación más fría del año. Es importante contener al máximo la dispersión del virus, ya que cuanto mayor sea el número de personas que infecte, el mismo estará sometido a un mayor número de eventos de recombinación genética por reordenamiento con virus influenza humanos previos y esto puede condicionar a la

  19. ESTRATEGIAS DE AJUSTE ANTE CHOQUES HIPOTÉTICOS DE OFERTA Y DEMANDA. Resultados de una encuesta a empresas mexicanas

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    Paula Sánchez-Romeu

    2015-01-01

    Full Text Available En este artículo se analizan estrategias de ajuste para hacer frente a choques hipotéticos de oferta y demanda utilizadas por 1 138 empresas mexicanas encuestadas por el Banco de México en 2012. Los resultados del análisis muestran que la respuesta de las empresas ante los dos tipos de choque en general no es simétrica y que éstas reaccionan combinando estrategias (principalmente eligen reducir costos, con lo cual moderan los ajustes a precios y producción. Más competencia hace que las empresas utilicen con más intensidad las estrategias de ajuste y favorece la flexibilidad de los precios. Ante cualquier choque, los costos que más se reducen son los no laborales y los que genera el empleo temporal. Una alta competencia y un mayor porcentaje de costos laborales intensifican el traspaso de los choques al empleo; por el contrario, los acuerdos colectivos de trabajo mitigan dicho traspaso. No se observa un traspaso de los choques a las percepciones salariales, lo cual, aunado a la baja incidencia de la reducción del salario base, evidencia rigidez en los salarios nominales de las empresas entrevistadas.

  20. El investigador ante lo indecible y lo inenarrable (una ética de la escucha

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    Juan Pablo Aranguren Romero

    2008-10-01

    Full Text Available El artículo desarrolla un análisis acerca de las cuestiones ético-metodológicas que subyacen a la investigación en ciencias sociales en torno a situaciones límite que han degradado y atentado contra la dignidad humana. Sitúa una serie de consideraciones teóricas en torno a la escucha, el silencio, la rememoración y la posibilidad de resignificación de los hechos de violencia, a partir de una deconstrucción de la noción de entrevista, de una puesta en tensión de los lugares de poder que guían el conocimiento social y del reconocimiento del lugar político del investigador.

  1. Desarmar la codicia. Una propuesta ética ante el armamentismo

    OpenAIRE

    Montesinos García, David

    2017-01-01

    La tesis se contextualiza en un panorama mundial en el que existe una acumulación exponencial por parte de las «Élites de poder» sumada a un gigantesco gasto militar y a una, cada vez más visible, corrupción sistémica. Estos factores provocan violencia, pobreza, sufrimiento y muerte. Por ello, se indaga la relación causal entre la codicia, la violencia y el armamentismo partiendo de una clara y valiosa intuición de Gandhi: «si no hubiera codicia las armas no tendrían razón de ser». Asimis...

  2. Disseny de calefacció amb terra radiant d'una casa a l'horta de Lleida mitjançant energia geotèrmica

    OpenAIRE

    Fillat Sobrino, Jordi

    2008-01-01

    S'ha realitzat el disseny de calefacció d'una vivenda mitjançant energia geotèrmica de baixa temperatura, amb un bescanviador vertical de 80 m de profunditat. El sistema de calefacció és de terra radiant en forma d'espiral.

  3. El chocolate antes de la Gran Guerra: una perspectiva desde los sistemas abiertos

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    Oscar M. Granados

    2017-08-01

    Full Text Available Este artículo evalúa la transformación del consumo global de chocolate en el periodo previo a la Gran Guerra (1870-1914. La investigación revela que el consumo de chocolate, más allá de una relación causal del mejoramiento en el ingreso y la búsqueda de un mejor estatus social, emergió de una interacción continua de diversos elementos como la innovación chocolatera, el emprendimiento, el comercio, la banca, la economía política y la política imperial. Por lo tanto, el consumo de chocolate funcionó como un sistema abierto.

  4. Didáctica de las matemáticas y desarrollo profesional de una maestra. El caso de Maria Antònia Canals i Tolosa

    OpenAIRE

    Sotos Serrano, María

    2015-01-01

    [ES]El objetivo general es el de describir y analizar la biografía escolar y profesional de la profesora M. Antònia Canals i Tolosa, relacionada con la enseñanza en general y con la enseñanza de las matemáticas en particular. Para ello se adopta una perspectiva biográfica en el estudio de un caso único, elaborando una historia de vida a partir de diferentes fuentes de datos: observación directa, treinta entrevistas, cartas y documentos secundarios. Para el proceso de análisis se ha seguido...

  5. La otredad en el personaje Antígona de Sófocles. Aproximación a una lectura desde Emmanuel Lévinas

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    Edison Francisco Viveros Chavarría

    2016-06-01

    Full Text Available Este artículo se ocupa de plantear una aproximación a la relación entre el personaje Antígona de Sófocles y la noción de otredad propuesta por Emmanuel Lévinas. La tesis que se sostiene es la siguiente: es la otredad una de las experiencias que llevan a Antígona a decidir el camino de la muerte propia motivada por la condena de su hermano muerto. Los tópicos del escrito se dividen en dos: la proximidad de Antígona con su hermano y la otredad en la decisión frente a la condena de su hermano muerto. Se concluye este texto afirmando que Lévinas y Sófocles pueden dialogar en un sentido ético, el de la libertad, el de la elección por el otro y las consecuencias que esto tiene; resaltan cada uno la importancia del valor que tiene una insubordinación cuando la injusticia y la imposición son el arma del tirano.

  6. Modificación de actitudes ante el Sida en estudiantes de enfermería: Resultados de una experiencia pedagógica

    Directory of Open Access Journals (Sweden)

    Lidia Fernández Donaire

    Full Text Available El objetivo de este trabajo fue comprobar si una intervención pedagógica fundamentada en una metodología activa, que incluye el trabajo cooperativo y el fomento de la discusión, era capaz de modificar en sentido positivo la actitud de los estudiantes ante el VIH/SIDA. Participaron en el estudio un total de 80 estudiantes de enfermería, divididos en dos grupos; el primero de ellos, formado por 39 estudiantes, constituía el grupo de intervención, donde se llevó a cabo la experiencia pedagógica. El segundo grupo, de 41 sujetos, constituyó el grupo control. Todos los estudiantes respondieron a la Escala de Actitud ante el Sida para Enfermería (EASE antes y después de la intervención. Los resultados muestran que se produjo un aumento positivo de la actitud ante el Sida estadísticamente significativo en el grupo de intervención, después de haber pasado por el período de formación. Por el contrario, en el grupo control, no se observaron diferencias significativas entre las dos medidas. Estos resultados confirman la eficacia de la metodología pedagógica utilizada en el cambio positivo de las actitudes de los estudiantes ante cuestiones que, como el Sida, están mediatizadas por el contexto social y cultural y que son determinantes en la calidad de su futuro trabajo como profesionales de la salud.

  7. Los medios ante las catástrofes y crisis humanitarias: propuestas para una función social del periodismo

    OpenAIRE

    Toledano, S. (Samuel); Ardévol-Abreu, A. (Alberto)

    2013-01-01

    Los medios de comunicación deben desempeñar una función social, al servicio del público al que se dirigen. Esta labor es especialmente importante ante determinados acontecimientos de gran impacto social, como las catástrofes y las crisis humanitarias. En este estudio se llevó a cabo un análisis de códigos deontológicos, libros de estilo y otras herramientas de autorregulación, sin que hallaran recomendaciones específicas para la cobertura adecuada de estas situaciones. Un análisis...

  8. Emociones de maestros en formación inicial sobre la didáctica de las ciencias antes de una intervención indagatoria

    OpenAIRE

    Retana Alvarado, Diego Armando

    2017-01-01

    El propósito de este estudio es analizar las emociones de 185 estudiantes del Grado de Maestro en Educación Primaria de la Universidad de Huelva (España), respecto a la asignatura Didáctica de las Ciencias de la Naturaleza I, los contenidos científicos, la metodología, el profesor y el clima de aula; antes de una intervención indagatoria de carácter metaemocional. Los alumnos respondieron un cuestionario y los datos se analizaron descriptivamente. Los resultados revelan la prevalencia de emoc...

  9. Apoyo a la parturiente por su acompañante escogido en una maternidad brasileña: ensayo clínico controlado randomizado

    Directory of Open Access Journals (Sweden)

    Odaléa Maria BRÜGGEMANN

    2010-12-01

    Full Text Available El apoyo por acompañante escogido por la parturiente es una das recomendaciones de la Organización Mundial de la Salud. Se trata de un relato de experiencia acerca de la realización de un ensayo clínico controlado randomizado, que buscó conocer la influencia de este proveedor de apoyo sobre la satisfacción de la mujer con la experiencia del trabajo de parto/parto y sobre los resultados maternos, perinatales y de lactancia, en las primeras 12 horas después del parto. Se realizó en un hospital de la Universidade Estadual de Campinas, de febrero/2004 a marzo/2005 con una muestra de 212 primíparas (105 no grupo de intervención - con acompañante y 107 en el del control - sin acompañante. Para análisis estadística se utilizó los testes t de Student o Wilcoxon, chi-cuadrado o exacto de Fisher, razones de riesgo e intervalos de confianza a 95% y escala tipo Likert. Los resultados fueron publicados en el artículo Support to woman by a companion of her choice during childbirth: a randomized controlled trial en la revista Reproductive Health, en 2007. Las parturientas del grupo de intervención estuvieron más satisfechas con la experiencia del trabajo de parto/parto que las del grupo-control. De los eventos del trabajo de parto/parto analizados, apenas la presencia de líquido meconial fue significativamente menor en el grupo de intervención lo que puede haber sido por el contexto asistencial en que la investigación se realizó. Este estudio representa una contribución importante para implementar la legislación actualmente vigente en el Brasil, conocida como “Ley del acompañante”.

  10. Enfermedad respiratoria grave en terapia intensiva durante la pandemia por el virus de influenza A (H1N1 2009

    Directory of Open Access Journals (Sweden)

    José Aquino-Esperanza

    2010-10-01

    Full Text Available Se describen pacientes hospitalizados en una unidad de terapia intensiva por enfermedad respiratoria aguda grave con características de influenza durante los primeros meses de la pandemia por influenza A(H1N1 2009 en la Argentina. Evaluamos datos clínicos, scores de gravedad, pruebas de laboratorio, microbiología y radiología torácica al ingreso, evolución y mortalidad hospitalaria, comparando pacientes con y sin confirmación de H1N1 por test de reacción de polimerasa en cadena, transcriptasa reversa (RT-PCR. Entre junio y julio de 2009 se internaron 31 pacientes adultos con una mediana de edad de 54 años (percentilo 25-75: 33-66. Presentaron test positivo para H1N1, 17 pacientes. Tenían al menos una condición concurrente 16 pacientes. La expresión radiográfica más frecuente fue infiltrados intersticio-alveolares bilaterales en 20 casos; 5 tenían consolidación lobar unilateral. La coinfección bacteriana (aislamiento de bacterias o IgM positiva para infecciones bacterianas, se demostró en 21 pacientes. Requirieron ventilación mecánica 23 pacientes y 18 desarrollaron síndrome de distrés respiratorio agudo (SDRA. La linfopenia y elevación de creatinina-fosfoquinasa fue frecuente (83% y 65%, respectivamente. Los 6 pacientes que murieron (19% eran mayores de 75 años o tenían cáncer o inmunodepresión. El tratamiento antiviral temprano (≤ 48 horas se asoció a menor necesidad de ventilación mecánica (54% vs. 89%; p: 0.043. No hubo diferencia significativa en las variables analizadas entre el grupo H1N1 positivo y el negativo, lo que sugiere tener igual enfoque terapéutico frente a una epidemia. La infección por H1N1 determinó falla respiratoria aguda y SDRA. La mortalidad ocurrió en pacientes añosos o con co-morbilidades graves.

  11. Una prueba de captura rápida de antígenos con tiras reactivas para el diagnóstico de malaria por P. falciparum

    Directory of Open Access Journals (Sweden)

    1997-01-01

    Full Text Available Los avances recientes en el diagnóstico de infecciones causadas por Plasmodium falciparum han permitido considerar la posibilidad de complementar la microscopia óptica con una prueba estandarizada de captura de antígenos con tiras reactivas basada en la detección de una proteína específica del parásito, que es segregada por los estadios sanguíneos asexuados y los gametocitos inmaduros, pero no por otros estadios. Los ensayos de campo indican que esta prueba proporciona resultados replicables con un umbral de detección de parasitemia de P. falciparum similar al obtenido con microscopia habitual de alta calidad para malaria y una especificidad y sensibilidad de alrededor de 90% en comparación con la microscopia habitual con extensión de sangre en capa gruesa. La estabilidad, reproducibilidad y facilidad de uso de la prueba indican claramente sus posibilidades de aplicación en el tratamiento de la malaria, particularmente en el nivel de atención de salud periférico, siempre y cuando se pueda garantizar su precisión y su costo sea módico. También debe considerarse la posibilidad de usarla más ampliamente donde lo justifiquen los requisitos operativos y los recursos y donde las decisiones se basen en una evaluación adecuada de los sistemas de prestación de asistencia de salud existentes.

  12. Aspectos a tener en cuenta antes de aplicar una antibioticoterapia Aspects to be taken into account before applying an antibiotic therapy

    Directory of Open Access Journals (Sweden)

    Moisés Morejón García

    2005-04-01

    Full Text Available Se presenta una revisión sobre los aspectos que debe tener en cuenta el facultativo antes de aplicar una antibioticoterapia, como son: la procedencia del paciente, la localización y el tipo de la sepsis, los factores del huésped, la determinación del germen posible, la selección del antibiótico, la vía de administración y sus dosis e intervalos, la duración del tratamiento antimicrobiano, los efectos adversos y el costo del medicamento. Además se abordan las combinaciones de antimicrobianos, la quimioprofilaxis antimicrobiana y el uso inadecuado de los antimicrobianos.A review of the aspects the physician should take into consideration before applying an antibiotic therapy is made. The origin of the patient, the location and type of sepsis, the factors of the guest, the determination of the possible germ, the selection of the antibiotic, the route of administration and its doses and intervals, the duration of the antimicrobial treatment, the adverse effects and the cost of the drug are among these aspects. The combination of antimicrobials, the antimicrobial chemoprophylaxis and the inadequate use of antimicrobials are also exposed.

  13. EVOLUCIÓN DE LA PANDEMIA POR EL VIRUS DE LA GRIPE (H1N1 2009 EN LA COMUNIDAD AUTÓNOMA DE LA RIOJA

    Directory of Open Access Journals (Sweden)

    Eva María Martínez Ochoa

    2010-01-01

    Full Text Available Fundamento. El objetivo de este estudio ha sido realizar un análisis de la evolución de la pandemia por el virus de la gripe (H1N1 2009 en la Comunidad Autónoma de La Rioja tanto en atención primaria como en hospitalaria. Métodos. El periodo de estudio incluyó desde la semana 28- 2009 hasta la 3-2010. La información de los casos de gripe se obtuvo de las bases informatizadas de atención primaria (OMI, de los listados remitidos por los servicios hospitalarios de medicina preventiva, del laboratorio de referencia de La Rioja y de los formularios de notificación individual. Se realizó una descripción de los casos según distribución por semana, sexo, edad, factores de riesgo, evolución y complicaciones. Se utilizó la regresión binaria logística para estimar las odds ratios ajustadas y su intervalo de confianza al 95%, de recibir tratamiento antiviral según factores de riesgo. Resultados. Hasta la semana epidemiológica 3 de 2010 se declararon a través del sistema OMI de atención primaria 7.096 casos de sospecha de gripe (H1N1 2009, fueron hospitalizados 111 casos con diagnóstico confirmado por laboratorio. Requirieron atención en cuidados intensivos 5 (4,5% y 2 fallecieron. Todos ellos presentaban factores de riesgo. Ninguno de los niños ni de las mujeres embarazadas hospitalizados precisaron ingreso en cuidados intensivos. Conclusiones. Durante la pandemia la gripe (H1N1 2009 fue una enfermedad propia de la población pediátrica y joven, apareciendo con menor frecuencia en las personas mayores de 60 años. La evolución clínica en La Rioja cursó de forma leve en la mayoría de las personas diagnosticados.

  14. Filosofía y literatura: dos herramientas necesarias ante los retos de una nueva Ilustración

    Directory of Open Access Journals (Sweden)

    Asunción Herrera Guevara

    2017-01-01

    Full Text Available El ciudadano global necesita deliberar sobre los nuevos fenómenos globales. Debe preguntarse hacia dónde nos encamina la globalización y cuáles son sus consecuencias. El presente trabajo propone dirigir la globalización hacia una nueva Ilustración. Esta nueva Ilustración tendría que alcanzar lo que toda Ilustración promete: la emancipación del hombre. Mostraré que la Filosofía y la Literatura son dos herramientas necesarias para reflexionar sobre los actuales problemas éticos y políticos y, por ende, para alcanzar la emancipación. La metodología empleada será un análisis hermenéutico de textos filosóficos y literarios con el fin de argumentar mi propuesta.

  15. De pescadores y agricultores: una historia local de la gente del valle de Chicama antes de 1565

    Directory of Open Access Journals (Sweden)

    1995-01-01

    Full Text Available DE PECHEURS ET AGRICULTEURS : UNE HISTOIRE LOCALE DES HABITANTS DE LA VALLEE DE CHICAMA AVANT 1565. Une transcription de la deuxième partie d'un manuscrit, daté de 1565 et publié ici, présente l'histoire orale de la vallée de Chicama, racontée par les chefs indigènes de l'époque de Guayna Capac. Une introduction au document donne des informations sur des rencontres entre Européens et indigènes sur l’implantation des Espagnols dans la vallée sur les conceptions différentes de la terre et de la tenure foncière et sur la dégradation du milieu naturel. Se presenta una transcripción de la segunda mitad de un manucristo de 1565 que cuenta la historia oral de los señores étnicos del valle de Chicama desde los tiempos de Guayna Capac. Una introducción al documento pone el manuscrito en su contexto histórico, hablando del encuentro entre los españoles y los naturales del asentamiento español del valle de los conceptos españoles e indígenas acerca de la tierra y la tenencia de dicho valle y la degradación del medio ambiente. ABOUT FISHERMEN AND AGRICULTURISTS: A LOCAL HISTORY OF THE PEOPLE IN CHICAMA'S VALLEY BEFORE 1565. A transcription of the second part of a manuscript, dated 1565 and published here, presents the oral history of the Valley of Chicama, as told by native lords, from the time of Guayna Capac. An introduction to the document provides information on the encounters between Europeans and natives Spanish settlement of the Valley conflicting conceptions of land and tenure and environmental degradation.

  16. Una necesidad curricular ante los procesos homogeneizantes de la educación contemporánea

    Directory of Open Access Journals (Sweden)

    Rafael Esteban Jiménez-Corrales

    2007-09-01

    Full Text Available El presente artículo trata de analizar la creación de las propuestas curriculares como producto de la convergencia de microprocesos institucionales y personales y macroprocesos sociales, lo cual se denomina en la teoría sociológica como desarrollos sintéticos. El escrito parte de la idea de que la creación de productos curriculares sólidos, transita por procesos históricos previos, los cuales son sistematizados e interpretados por los actores sociales en escenarios a veces antagónicos académicamente. Para ilustrar tales procesos, utiliza el ejemplo de la creación de la Maestría en Pedagogía con énfasis en Diversidad en los Procesos Educativos de la División de Educación Básica del Centro de Investigación y Docencia en Educación de la Universidad Nacional, Costa Rica, donde enfatiza en el impacto que los cambios sociales van generando en la discusión académica y cómo esta va convergiendo en la creación de un plan de estudios y en el desarrollo de una carrera.

  17. Resultados y retos en salud pública ante la alerta por Ébola: una perspectiva desde Cataluña

    Directory of Open Access Journals (Sweden)

    Mireia Jané

    2017-03-01

    Full Text Available El brote de enfermedad por virus Ébola iniciado en Guinea Conakry y notificado a la Organización Mundial de la Salud en marzo de 2014 ha sido el mayor documentado hasta la fecha. Su extensión a países limítrofes y el riesgo de expansión fuera del continente africano hicieron que, en agosto de 2014, fuese declarado emergencia de salud pública internacional. En el marco de lo establecido por el Centro de Coordinación de Alertas y Emergencias Sanitarias, la Agencia de Salud Pública de Cataluña inició las actuaciones de salud pública en marzo de 2014 y elaboró un único protocolo para todo el territorio, consejos para viajeros y cooperantes procedentes de países afectados, y una nota informativa semanal. Asimismo, en Cataluña, se crearon el Comité de Análisis y Seguimiento de Ébola y el Comité Científico Asesor de Ébola. Se realizaron sesiones informativas y formativas a más de 9600 profesionales de la salud de diferentes ámbitos. Desde agosto de 2014, a través del Sistema de Urgencias de Vigilancia Epidemiológica de Cataluña se notificaron 117 sospechas de Ébola. En tres casos se activó el protocolo con derivación al centro hospitalario de referencia, siendo los resultados descartados microbiológicamente. Se realizó la vigilancia de 95 cooperantes, un 52% mujeres y un 74% procedentes de Sierra Leona. En la gestión de alertas fueron esenciales la preparación y la planificación previas, el trabajo sinérgico entre la red epidemiológica, la asistencial y el conjunto de agentes implicados, así como la comunicación de riesgo precisa, veraz y proporcionada. Fue clave el circuito de cribado previo establecido ante la sospecha de casos por parte de los servicios de vigilancia epidemiológica. Así, solo se activó el protocolo de inmediato en aquellos casos que cumplían estrictamente los criterios. Este es un aspecto esencial a reforzar y mantener de cara a futuras alertas de salud pública internacional.

  18. Frecuencia fenotípica y génica de los antígenos HLA en una muestra de la población cubana

    OpenAIRE

    Morera Barrios, Luz M; R, Catalino; García, Ustáriz; García García, María A.; Díaz Báez, Nelioska; Lam Díaz, Rosa M; Guerreiro Hernández, Ana M; Hernández Ramírez, Porfirio; Ballester Santovenia, José M

    2005-01-01

    Se realizó un estudio de la frecuencia fenotípica y génica de los antígenos del sistema principal de histocompatibilidad HLA en personas no relacionadas, supuestamente sanas, tomadas como muestra de la población cubana. Se analizó la distribución de 87 antígenos HLA clase I ( loci A, B y C) y 25 clase II ( loci DR y DQ). Se emplearon las técnicas de microlinfocitotoxicidad (serológica) descrita por Terasaki y modificada por el NIH para los antígenos de clase I, y las técnicas de biología mole...

  19. Enfermedad respiratoria grave en terapia intensiva durante la pandemia por el virus de influenza A (H1N1 2009 Severe respiratory disease in an intensive care unit during influenza A(H1N12009 pandemia

    Directory of Open Access Journals (Sweden)

    José Aquino-Esperanza

    2010-10-01

    Full Text Available Se describen pacientes hospitalizados en una unidad de terapia intensiva por enfermedad respiratoria aguda grave con características de influenza durante los primeros meses de la pandemia por influenza A(H1N1 2009 en la Argentina. Evaluamos datos clínicos, scores de gravedad, pruebas de laboratorio, microbiología y radiología torácica al ingreso, evolución y mortalidad hospitalaria, comparando pacientes con y sin confirmación de H1N1 por test de reacción de polimerasa en cadena, transcriptasa reversa (RT-PCR. Entre junio y julio de 2009 se internaron 31 pacientes adultos con una mediana de edad de 54 años (percentilo 25-75: 33-66. Presentaron test positivo para H1N1, 17 pacientes. Tenían al menos una condición concurrente 16 pacientes. La expresión radiográfica más frecuente fue infiltrados intersticio-alveolares bilaterales en 20 casos; 5 tenían consolidación lobar unilateral. La coinfección bacteriana (aislamiento de bacterias o IgM positiva para infecciones bacterianas, se demostró en 21 pacientes. Requirieron ventilación mecánica 23 pacientes y 18 desarrollaron síndrome de distrés respiratorio agudo (SDRA. La linfopenia y elevación de creatinina-fosfoquinasa fue frecuente (83% y 65%, respectivamente. Los 6 pacientes que murieron (19% eran mayores de 75 años o tenían cáncer o inmunodepresión. El tratamiento antiviral temprano (≤ 48 horas se asoció a menor necesidad de ventilación mecánica (54% vs. 89%; p: 0.043. No hubo diferencia significativa en las variables analizadas entre el grupo H1N1 positivo y el negativo, lo que sugiere tener igual enfoque terapéutico frente a una epidemia. La infección por H1N1 determinó falla respiratoria aguda y SDRA. La mortalidad ocurrió en pacientes añosos o con co-morbilidades graves.We describe characteristics of patients admitted to our intensive care unit with severe acute respiratory illness and influenza-like syndrome during the first months of the pandemic influenza

  20. Aislamiento de una cepa de campo de Babesia bigemina (Piroplasma: Babesiidae y establecimiento del cultivo in vitro para la producción de antígenos

    Directory of Open Access Journals (Sweden)

    Roger I Rodríguez-Vivas

    2007-03-01

    Full Text Available La babesiosis bovina ocasionada por Babesia bigemina produce grandes pérdidas a la economía pecuaria Mexicana. Debido a las variaciones antigénicas que presenta B. bigemina es necesario contar con antígenos locales para la realización de estudios epidemiológicos y de inmunización. Se recolectaron 30 garrapatas Boophilus microplus de un bovino adulto clínicamente enfermo de babesiosis (B. bigemina en Yucatán, México. En laboratorio se produjeron larvas, ninfas y una cepa congelada. El aislamiento de la cepa se realizó con éxito y se necesitó 30 días en el cultivo in vitro para obtener un PEI del 1.5 %. La cepa fue congelada en nitrógeno líquido y reactivada en el cultivo celular. La concentración del medio que permitió el mayor PEI (14 %, pIsolation of a field strain of Babesia bigemina (Piroplasma: Babesiidae and establishment of in vitro culture for antigen production. Bovine babesiosis, caused by Babesia bigemina, is a barrier for livestock development; it results in high economic loss to Mexican livestock. Control requires adequate antigens for diagnosis and vaccination programs. However, because of antigenic variation among Babesia strains, it is necessary to use antigens prepared from local strains. The purpose of the present study was to isolate a local field strain and to establish the in vitro culture of B. bigemina by the evaluation of the constituent’s concentration of culture media. Thirty engorged female Boophilus microplus were collected from cattle suffering clinical babesiosis (B. bigemina in Yucatan state, Mexico. These ticks were sent to the laboratory for detection of Babesia sp. vermicules. Eggs were kept at 83-85 % humidity and 27 ºC until hatching. Larvae were transferred to an esplenectomized calf (B-1. The resulting nymphs were transferred to an esplenectomized calf (B-2. Twelve days later, B. bigemina (local strain was detected in calf B-2 and its infected blood was frozen in liquid nitrogen to

  1. Modelos de cinemática de placas para Antártida durante la ruptura de Gondwana: una revisión

    OpenAIRE

    M.E. Ghidella; L.A. Lawver; S. Marenssi; L.M. Gahagan

    2007-01-01

    La historia de apertura del mar de Weddell y del Oc éano Atlántico Sur es crítica para comprender la ruptura de Gondwana y la evolución geológica de Antártida desde el Jurásico temprano. La dispersión de los fragmentos gondwánicos es importante para entender la circulación oceánica del pasado, descifrar la historia de las cuencas sedimentarias ubicadas al Este de la Península Antártica y establecer posibles rutas de dispersión de flora y fauna entre los continentes australes. Desafortunadamen...

  2. Respuestas ante la confusión del consumidor por información ambigua: el caso de los cosméticos de una cadena de supermercados en España

    Directory of Open Access Journals (Sweden)

    José S. Clemente-Ricolfe

    2014-07-01

    Full Text Available Este estudio expuso y agrupó las reacciones de los consumidores ante la confusión generada por información ambigua para una marca de cosméticos de una cadena de supermercados. El método de recogida de la información fue la netnografía, usando para su análisis Componentes Principales Categóricos. Este trabajo supuso una aportación a la literatura sobre la confusión del consumidor porque la información se recogió a partir de comentarios on-line. La respuesta más citada fue la mala calidad percibida del producto. En relación al marco teórico, hay dos reacciones que no habían sido señaladas: las críticas a los medios de comunicación y la posible hostilidad de la competencia. La agrupación de las respuestas dadas se ha centrado fundamentalmente en dos aspectos: la imagen percibida de las empresas y la calidad de los productos.

  3. Antes de la Aurora. En torno a una fenomenología de lo divino en María Zambrano

    Directory of Open Access Journals (Sweden)

    Chantal MAILLARD

    2009-11-01

    Full Text Available Al serme propuesta la redacción de un artículo sobre María Zambrano, pensé en principio ofrecer una síntesis del «Ensayo para una fenomenología de lo divino», presentado como Tesis de Licenciatura en Málaga en el año 1984, ya que supone una visión particular de la obra zambraniana y fué fruto, más que de una larga investigación, de un largo meditar tanto intelectual como vivencial, pues de ninguna otra manera puede uno introducirse en el pensamiento de esta autora.

  4. Hey! A Fire Ant Stung Me!

    Science.gov (United States)

    ... Videos for Educators Search English Español Hey! A Fire Ant Stung Me! KidsHealth / For Kids / Hey! A ... Me picó una roja o colorada! What's a Fire Ant? There are many different types of fire ...

  5. Concentraciones séricas de interleucina 2 y su receptor soluble, antes y después de una cirugía Serum concentrations of interleukin 2 and its soluble receptor, before and after surgery

    Directory of Open Access Journals (Sweden)

    Maczy González Rincón

    2006-12-01

    Full Text Available Con el objetivo de determinar las concentraciones séricas de interleucina 2 (IL-2 y su receptor soluble (RsIL-2 antes y después de una cirugía y su relación en cada período de estudio, se determinó, mediante inmunoensayo enzimático, los niveles de IL-2 y RsIL-2 antes y 24 horas después de la cirugía en 40 pacientes sometidos a cirugía menor y cirugía mayor. En cirugía menor se obtuvieron niveles promedio para IL-2 de 0,938 y 0,139 U/mL, para RsIL-2 de 364,8 y 497 pg/mL; mientras que en cirugía mayor los valores fueron: para IL-2 de 2,03 y 0,114 U/mL y RsIL-2 de 319,7 y 600 pg/mL, en cada período respectivamente. La disminución observada de los niveles de IL-2 y el incremento del RsIL-2 en cirugía mayor y menor podría sugerir una alteración de la respuesta inmunitaria celular, generada no sólo por el estrés quirúrgico, sino posiblemente por el efecto reconocido de los anestésicos en la depresión de la función óptima del sistema inmunitario

  6. Evaluación de la vulnerabilidad biofísica de los servicios ecosistémicos ante el cambio climático: una aproximación conceptual y metodológica

    Directory of Open Access Journals (Sweden)

    Maria Fernanda Cardenas

    2016-01-01

    Full Text Available La vulnerabilidad al cambio climático ha sido considerada y evaluada desde diferentes perspectivas, de acuerdo con los objetivos del estudio o del autor, de tal manera que existe un sinnúmero de definiciones, de enfoques, de indicadores o variables para evaluarla y por ende una falta de consenso sobre el tema. En las últimas décadas, la mayoría de los trabajos relacionados con el cambio climático han estado enfocados a determinar los principales impactos del cambio climático y a evaluar la vulnerabilidad de la población humana ante amenazas, es decir, vulnerabilidad socioeconómica. En este trabajo se discute la importancia de evaluar la vulnerabilidad intrínseca de los ecosistemas, y de los bienes y servicios que éstos prestan, a partir de sus aspectos biofísicos, como base fundamental para evaluar la vulnerabilidad de las poblaciones humanas que dependen de esos bienes y servicios ecosistémicos. Por tanto, se propone un modelo conceptual y una ruta metodológica para evaluar un valor ecosistémico particular, y se presenta, a manera de ejemplo, un caso de estudio en el cual se proponen las variables pertinentes e indicadores a tener en cuenta para la evaluación de la vulnerabilidad hidrológica que tienen los ecosistemas de alta montaña en el trópico ante el cambio climático.

  7. Beyond ANT

    DEFF Research Database (Denmark)

    Jansen, Till

    2017-01-01

    Actor-Network-Theory (ANT) offers an ‘infra-language’ of the social that allows one to trace social relations very dynamically, while at the same time dissolving human agency, thus providing a flat and de-centred way into sociology. However, ANT struggles with its theoretical design that may lead...... us to reduce agency to causation and to conceptualize actor-networks as homogeneous ontologies of force. This article proposes to regard ANT’s inability to conceptualize reflexivity and the interrelatedness of different ontologies as the fundamental problem of the theory. Drawing on Günther......, it offers an ‘infra-language’ of reflexive relations while maintaining ANT’s de-centred approach. This would enable us to conceptualize actor-networks as non-homogeneous, dynamic and connecting different societal rationales while maintaining the main strengths of ANT....

  8. La tutoría académica en la enseñanza superior: una estrategia docente ante el nuevo reto de la Convergencia Europea

    Directory of Open Access Journals (Sweden)

    Pedro ÁLVAREZ PÉREZ

    2005-01-01

    Full Text Available En el contexto de la convergencia europea, la función tutorial se plantea como una competencia profesional y como una estrategia docente del profesorado universitario. Su implantación y desarrollo va a requerir un cambio de actitud y una nueva manera de orientar la formación universitaria, dado que ahora se enfatiza un enfoque centrado en el alumno frente a un enfoque centrado en el profesor en el que el aprendizaje es el paradigma de referencia de la práctica educativa. Este cambio debería estar impulsado de manera institucional, iniciándose procesos de formación acordes con las nuevas exigencias, con el fin de que el profesorado sintonice con las nuevas perspectivas de la formación universitaria y con el nuevo rol a desarrollar en la tutoría académica.

  9. Potenciació de la línia de negoci de www.guiacomerciolocal.es mitjançant una aplicació Android

    OpenAIRE

    Vendrell Tarazona, Vicent

    2013-01-01

    El projecte que ens ocupa és la creació d'una aplicació mòbil que ens ajude a potenciar i explotar les noves funcionalitats que apropen les empreses als clients finals i ajuden a afiançar les relacions interpersonals creades. El proyecto que nos ocupa es la creación de una aplicación móvil que nos ayude a potenciar y explotar las nuevas funcionalidades que acercan las empresas a los clientes finales y ayudan a afianzar las relaciones interpersonales creadas. Master thesis for the Free S...

  10. La necesidad de una teoría crítica de la modernización ante las realidades de la segunda mitad del siglo XX

    OpenAIRE

    H.C.F. Mansilla

    2008-01-01

    Después del contacto permanente con la exitosa civilización occidental, los países del Tercer Mundo se han consagrado a un desarrollo acelerado en la segunda mitad del siglo XX, que ha significado el mayor cambio social en toda su historia. En general el resultado es una evolución imitativa, que es percibida, sin embargo, como algo propio y autónomo. Una teoría crítica de lamodernización es importante para analizar las luces y las sombras de esta evolución de acuerdo a un sentido común guiad...

  11. Modificación de actitudes ante el Sida en estudiantes de enfermería: Resultados de una experiencia pedagógica Modification of attitudes regarding AIDS among nursing students: Findings of a pedagogic experiment

    Directory of Open Access Journals (Sweden)

    Lidia Fernández Donaire

    2006-06-01

    Full Text Available El objetivo de este trabajo fue comprobar si una intervención pedagógica fundamentada en una metodología activa, que incluye el trabajo cooperativo y el fomento de la discusión, era capaz de modificar en sentido positivo la actitud de los estudiantes ante el VIH/SIDA. Participaron en el estudio un total de 80 estudiantes de enfermería, divididos en dos grupos; el primero de ellos, formado por 39 estudiantes, constituía el grupo de intervención, donde se llevó a cabo la experiencia pedagógica. El segundo grupo, de 41 sujetos, constituyó el grupo control. Todos los estudiantes respondieron a la Escala de Actitud ante el Sida para Enfermería (EASE antes y después de la intervención. Los resultados muestran que se produjo un aumento positivo de la actitud ante el Sida estadísticamente significativo en el grupo de intervención, después de haber pasado por el período de formación. Por el contrario, en el grupo control, no se observaron diferencias significativas entre las dos medidas. Estos resultados confirman la eficacia de la metodología pedagógica utilizada en el cambio positivo de las actitudes de los estudiantes ante cuestiones que, como el Sida, están mediatizadas por el contexto social y cultural y que son determinantes en la calidad de su futuro trabajo como profesionales de la salud.The aim of this work was to verify whether a pedagogic intervention based on the use of active methodology, including both cooperative work and stimulus of discussion, was capable of modifying the students' attitude regarding HIV/AIDS. To this end, 80 nursing students were divided in two groups. The first (39 students was the intervention group where the pedagogic experiment was performed. The second group (41 subjects was used as a control. All students answered the AIDS Attitude Scale for Nursing (EASE protocol at the beginning and end of the pedagogic trial. An analysis of the results demonstrates that a statistically significant positive

  12. Antígona y la muerte

    OpenAIRE

    Pérez Alcolea, Simona Micaela

    2012-01-01

    La ponencia analiza la muerte de Antígona en la obra de Sófocles. Se propone que su suicidio es un acto consciente de voluntad preanunciado a lo largo de toda la obra y no una medida desesperada. Con ese fin se exploran las posibles motivaciones de Antígona para poner fin a su vida. En el análisis se proponen tres respuestas (no necesariamente excluyentes): -Antígona responde a la ética homérica. Está en lucha con Creón, y su suicidio es su golpe de gracia al poder del rey. -Antígona...

  13. Hospitales seguros ante desastres

    OpenAIRE

    Celso Vladimir Bambaren Alatrista; María Del Socorro Alatrista Gutierrez

    2007-01-01

    Entre 1982 a 2005 se registraron daños en 1 143 establecimientos de salud en el Perú, generalmente debido a sismos, lluvias e inundaciones. Los daños en los servicios de salud producen la interrupción de la atención de la población y de los programas de salud, así como generan un gran gasto para la rehabilitación y reconstrucción. Por ello, se requiere proteger a los establecimientos de salud y desarrollar una política de hospitales seguros ante desastres que incluya medidas para prevenir o r...

  14. LA VALORACIÓN DE LA ACTITUD ANTE EL RIESGO EN PERSONAS QUE DEMANDAN CUIDADOS EN SALUD: UNA APROXIMACIÓN MEDIANTE JUEGOS DE LOTERÍAS UTILIZANDO GENERALIZED ESTIMATING EQUATIONS

    Directory of Open Access Journals (Sweden)

    Jesús Martín-Fernández

    2016-01-01

    Full Text Available La caracterización de la actitud ante el riesgo puede ser útil en la planificación de las intervenciones sanitarias. El objetivo fue estudiar la actitud ante el riesgo de una población que demanda cuidados de salud y evaluar la capacidad de un juego de loterías para evidenciar dicha actitud. Métodos: Estudio multicéntrico transversal. Se recogieron características demográficas, socioeconómicas, de calidad de vida y conductas de riesgo en salud de 662 personas usuarias de 23 centros de salud seleccionadas mediante muestreo aleatorio. La actitud ante el riesgo se evaluó mediante una escala subje - tiva y mediante dos juegos de azar (L1 y L2; L2 incluía la posibilidad de pérdidas económicas. Se realizaron modelos explicativos para valorar la variabilidad de la propensión al riesgo utilizando Generalized Estimating Equations (GEE. Resultados: El 19,1% (IC95%:15,6-22,6% de los sujetos expresaron una propensión al riesgo alta, el 10,0% (IC95%:7,0-13,0 fueron clasificados como propensos al riesgo con L2. Se encontró asociación entre una mayor propensión al riesgo y tener mejor percepción del estado de salud (0,110; IC95%:0,007- 0,212 o mayor renta (0,010; IC95%: 0,017- 0,123 o ser fumador (0,059; IC95%: 0,004-0,114. Ser español se relacionaba con menor propensión al riesgo (-0,105; IC95%: -0,205- -0,005, al igual que ser mayor de 65 años (-0,031; IC95%:- 0,061- -0,001 o ser mujer (-0,038, IC95%:-0,064- -0,012. El coeficiente de correlación intraclase para la escala subjetiva fue 0,511 (IC95%:0,372-0,629, 0,571 (IC95%:0,441-0,678 para L1 y 0,349 (IC95%:0,186-0,493 para L2. Conclusiones: Las personas que demandan cuidados de salud presentan con frecuencia propensión al riesgo, la cual se atenúa cuando se caracteriza median - te metodologías que implican pérdidas. La propensión al riesgo parece mayor en personas jóvenes, varones, con mejor estado de salud, con mayor renta y en inmigrantes.

  15. La necesidad de una teoría crítica de la modernización ante las realidades de la segunda mitad del siglo XX

    Directory of Open Access Journals (Sweden)

    H.C.F. Mansilla

    2008-01-01

    Full Text Available Después del contacto permanente con la exitosa civilización occidental, los países del Tercer Mundo se han consagrado a un desarrollo acelerado en la segunda mitad del siglo XX, que ha significado el mayor cambio social en toda su historia. En general el resultado es una evolución imitativa, que es percibida, sin embargo, como algo propio y autónomo. Una teoría crítica de lamodernización es importante para analizar las luces y las sombras de esta evolución de acuerdo a un sentido común guiado críticamente.

  16. Entre ovejas, pastores y perros. Crónica de una intervención artística en clave ANT. Among sheeps, shepherds and dogs. Chronicle of an artistic intervention using an ANT approach

    Directory of Open Access Journals (Sweden)

    Diego Carbajo Padilla

    2010-11-01

    Full Text Available El propósito de este artículo es aplicar y probar algunas de la herramientas teóricas desarrolladas por la Teoría del Actor Red sobre una intervención artística centrada en la Competición Internacional de Perros Pastores que se celebra anualmente en Oñati (Gipuzkoa. La primera parte, apoyándose en esta teoría describe los principales agentes que intervienen en el entramando que constituye la competición. La segunda se centra en la descripción y análisis de la intervención artística y algunos de los resultados que de ella se han producido. Por ultimo, se esbozan algunas ideas y críticas que suscitan tanto el análisis de la competición desde la Teoría del Actor Red como el cruce de esta con la práctica artística.

     

    The purpose of this article is to apply and to test some of the theoretical tools developed by Actor Network Theory within an artistic intervention centered on the International Competition of Sheepdogs annually celebrated in Oñati (Gipuzkoa. Based on this theory, the first section describes the principal agents who intervene in the fabric that constitutes the competition. The second section is focused on the description and analysis of the artistic intervention and some of its results. The last section includes some ideas and critiques emerging from the analysis of competition through the lens of Actor Network Theory and its overlaps with an artistic practice.

     

  17. Efecto de los cortafuegos sobre el ensamble de hormigas (Hymenoptera, Formicidae en una región semiárida, Argentina Effects of firebreaks on ant density (Hymenoptera, Formicidae in a semiarid region, Argentina

    Directory of Open Access Journals (Sweden)

    Francisco Rodrigo Tizón

    2010-09-01

    Full Text Available En las regiones áridas y semiáridas los bordes de los caminos o cortafuegos pueden afectar variables micro-climáticas las cuales, a su vez, alteran la abundancia de las hormigas que nidifican en el suelo. Se estudió la densidad de nidos en ambientes con diferentes características edáficas (suelos sueltos y compactados, y de cobertura de vegetación (monte cerrado, pastizal y suelo desnudo. El área de estudio se encuentra en el sur del Caldenal (sudeste de La Pampa, tiene 12 ha clausuradas al pastoreo con seis unidades experimentales en cada una de las cuales se seleccionaron tres sitios con cobertura leñosa (monte, con cobertura herbácea (pastizal y con el 80% de suelo desnudo (cortafuegos. En cada sitio se registraron la temperatura superficial, y la humedad, el pH, y el grado de compactación del suelo. La densidad de nidos se evaluó colocando tres transectas (80 m x 5 m al azar por cada unidad experimental. La temperatura del suelo fue mayor en los cortafuegos y la compactación del suelo fue mayor en los ambientes de monte y pastizal. El ensamble de hormigas estudiado no mostró diferencias (p>0,05 de nidificación entre los ambientes. En cambio, Acromyrmex striatus (Roger, 1863 se encontró principalmente en los cortafuegos donde los suelos sueltos con mayor porosidad permiten mayor intercambio gaseoso e infiltración de agua. La construcción de cortafuegos favorece el establecimiento de especies cortadoras de hojas que por ventajas competitivas podrían afectar negativamente la composición de la comunidad de hormigas y las comunidades vegetales.In arid and semiarid regions, the presence of roads or firebreaks can affect microclimatic variables that influence the abundance of soil nesting ants. We studied ant nest density in environments with different soil types (loose and compacted soil, and vegetation cover (shrubland, grassland and bare soil south of Caldenal, La Pampa, Argentina. We selected three areas with woody cover

  18. Gestión del riesgo en la transferencia de procesos productivos: Aplicación a la fabricación de comprimidos de oseltamivir en la pandemia de gripe A Risk management in the transfer of manufacturing processes: Application to the manufacturing of oseltamivir tablets in the swine flu pandemic

    OpenAIRE

    A. Juberías Sánchez; A. Zamanillo Sainz; JI. Cabrera Merino; M. Verón Moros; MªL. Urquía Grande; MªL. Gonzalo Salado

    2011-01-01

    Introducción: La gestión de riesgos aplicada a la industria farmacéutica, a través de su identificación, valoración y control, es una herramienta útil para garantizar la calidad del medicamento. La declaración por la Organización Mundial de la Salud en el año 2.009, de la pandemia provocada por el virus de la influenza H1N1, origina la necesidad de transformar en medicamento parte de las reservas estratégicas de fosfato de oseltamivir, pertenecientes al Ministerio de Sanidad y Política Social...

  19. Durero y los Hieroglyphica. Tres estampas y una pintura. Némesis (La Gran Fortuna. La Justicia. Melancolía I. Cristo ante los Doctores

    Directory of Open Access Journals (Sweden)

    González de Zárate, Jesús María

    2006-03-01

    Full Text Available The present study attempts to analyze several prints by Albrecht Dürer, as well as his painting Christ among the Doctors, in relation to the well-known Hieroglyphica of Horapollo, which we published in Spanish in 1991 (Akal. Erwin Panofsky analyzed the works of the German artist, but he apparently did not take into consideration certain iconographic details. Durer, following the advice of his protector Pirckheimer, elaborated the drawings for Horapollo’s Hieroglyphica, published by Professor George Boas. This visual and semantic vocabulary, of great importance in the History of Art from the Renaissance onward, and specifically in Durer’s graphic art, is evident in the carvings for the Triumphal Arch of Maximilian (1515, studied by Panofsky.

    El presente estudio trata de analizar algunas estampas de Alberto Durero, así como su pintura Cristo ante los doctores, en función de los conocidos Hieroglyphica de Horapollo que publicamos en edición castellana en el año 1991 (Akal. El análisis de la obra artística del maestro alemán fue realizado por Erwin Panofsky, pero algunos detalles iconográficos, al parecer, no se tuvieron en cuenta. Durero, bajo el consejo de su protector Pirckheimer elaboró los dibujos de los Hieroglyphica de Horapollo que han sido editados por el profesor americano Georges Boas. Este vocabulario visual y semántico, que tanto incidió en la Historia del Arte en la época Moderna, y más concretamente en el arte gráfico del maestro alemán, se demuestra en las entalladuras del Arco de Triunfo de Maximiliano de 1515 que estudiara Panofsky. Son algunas creaciones artísticas muy relevantes del maestro pintor-grabador, las que encierran de igual modo esta lectura, las que tratamos de analizar en el comentario que presentamos.

  20. Una prueba de captura rápida de antígenos con tiras reactivas para el diagnóstico de malaria por P. falciparum A rapid dipstick antigen capture assay for the diagnosis of falciparum malaria

    Directory of Open Access Journals (Sweden)

    1997-01-01

    Full Text Available Los avances recientes en el diagnóstico de infecciones causadas por Plasmodium falciparum han permitido considerar la posibilidad de complementar la microscopia óptica con una prueba estandarizada de captura de antígenos con tiras reactivas basada en la detección de una proteína específica del parásito, que es segregada por los estadios sanguíneos asexuados y los gametocitos inmaduros, pero no por otros estadios. Los ensayos de campo indican que esta prueba proporciona resultados replicables con un umbral de detección de parasitemia de P. falciparum similar al obtenido con microscopia habitual de alta calidad para malaria y una especificidad y sensibilidad de alrededor de 90% en comparación con la microscopia habitual con extensión de sangre en capa gruesa. La estabilidad, reproducibilidad y facilidad de uso de la prueba indican claramente sus posibilidades de aplicación en el tratamiento de la malaria, particularmente en el nivel de atención de salud periférico, siempre y cuando se pueda garantizar su precisión y su costo sea módico. También debe considerarse la posibilidad de usarla más ampliamente donde lo justifiquen los requisitos operativos y los recursos y donde las decisiones se basen en una evaluación adecuada de los sistemas de prestación de asistencia de salud existentes.Recent advances in the diagnosis of Plasmodium falciparum infections have made it possible to consider supplementing light microscopy with a standardized dipstick antigen capture assay based on the detection of a parasite-specific protein, which is secreted by the asexual blood stages and immature gametocytes but not by the other stages. Field trials indicate that this dipstick assay provides consistently reproducible results, with a threshold of detection of P. falciparum parasitaemia similar to that obtained by high quality routine malaria microscopy and a specificity and sensitivity of around 90% compared with standard thick blood film

  1. Sistema per ensacar mitjançant una cèl·lula de càrrega i un controlador dosificador

    OpenAIRE

    Bautista i Ballester, Jordi

    2009-01-01

    L'objectiu d'aquest projecte és la confecció d'un sistema de pesatge estandaritzable. Així doncs, tot i que el disseny de la màquina podrà dependre de les necessitats de cada cas, la base d'aquest serà la mateixa per tots els casos. Els coneixements previs necessaris per assolir un diseny final satisfactori són bàsicament els d'enginyeria industrial, incloent una bona base en disseny de maquinària tant en mecànica com en electricitat i control. Específicament també són necessaris coneixements...

  2. ESTIMACIÓN DE FACTORES DE EMISIÓN DE MATERIAL PARTICULADO RESUSPENDIDO ANTES, DURANTE Y DESPUÉS DE LA PAVIMENTACIÓN DE UNA VÍA EN BOGOTÁ

    Directory of Open Access Journals (Sweden)

    Juan Felipe Méndez Espinosa

    2017-01-01

    Full Text Available En Bogotá, estudios previos han mostrado que las emisiones de material resuspendido cons - tituyen una parte sustancial del inventario de emisiones e impactan de manera importante la calidad del aire de la ciudad. Esta investigación estimó los factores de emisión (FE de material particulado resuspendido antes, durante y después de la pavimentación de la vía principal del barrio Caracolí, en la localidad de Ciudad Bolívar, por parte de la Unidad de Mantenimiento Vial del Distrito (UMV. Conjuntamente, se midió el impacto de la pavimentación en la calidad del aire. La valoración del impacto y estimación experimental de FE de polvo resuspendido se obtuvo a partir de mediciones y un análisis estadístico experimental entre concentraciones de PM 10 , PM 2.5 , BC y variables meteorológicas al lado de la vía, junto con la aplicación de los modelos de disper - sión SCREEN3 y AERMOD. Los factores de emisión estimados para vía no pavimentada fueron 7,8 ± 0,5 g PM 10 /VKT y 0,6 ± 0,2 g PM 2.5 /VKT y para vía en proceso de construcción de 28 ± 0,27 μg PM 10 /m 2 *s y 11 ± 0,13 μg PM 2.5 /m 2 *s. La modelación de dispersión atmosférica de material particulado resuspendido mostró una reducción del área de impacto en aproximadamente 1km y más de un 95% en concentración.

  3. Autoreporte de exposición a publicidad y promoción de tabaco en una cohorte de fumadores mexicanos: Antes y durante la publicación de la Ley General para el Control del tabaco en 2008

    Science.gov (United States)

    Hernández, Rosaura Pérez; Thrasher, James F.; Bolaños, Rosibel Rodríguez; Gutiérrez, Inti Barrientos; Hernández, Norma A Ibañez

    2015-01-01

    Resumen Objetivo Determinar en población fumadora el nivel de exposición a la mercadotecnia por parte de la Industria Tabacalera (IT), a través de diferentes métodos de promocionar sus productos de tabaco, antes y durante la publicación de la Ley General para el Control del Tabaco (LGCT) en 2008. Material y métodos Estudio de cohorte en fumadores adultos (n=941 pre-LGCT y n=1051 post-LGCT) de cuatro ciudades mexicanas. Se realizaron análisis multivariados mediante modelos de ecuaciones de estimación generalizada (GEE). Resultados Se incremento el autoreporte de recepción de muestras gratis de cigarros (3.7% a 8.1%), ropa o artículos con marcas o logos (3.6% a 6.4%), haber visto información sobre eventos especiales (1.9% a 4.7%), y bares, antros y discos para mayores de edad (21.4% a 28%). Se observaron decrementos de publicidad en exteriores (54.7% a 47.2%). Conclusión Es necesaria una política integral con prohibiciones totales de la publicidad y promoción de los productos de tabaco que integre mayor vigilancia y sanciones para lograr la disminución y prevención del consumo de tabaco. PMID:22689158

  4. VIGILANCIA DE LA PANDEMIA DE GRIPE (H1N1 2009 EN ESPAÑA

    Directory of Open Access Journals (Sweden)

    Amparo Larrauri Cámara

    2010-01-01

    Full Text Available Fundamento: España experimentó una circulación del nuevo virus de la gripe (H1N12009 durante el verano de 2009, que evolucionó de forma creciente hasta la presentación a principios del otoño de la primera onda pandémica por dicho virus. Los objetivos de este trabajo son describir la evolución de esta onda pandémica en nuestro país y evaluar su impacto en la morbilidad y mortalidad de la población española. Método: A partir de la información proporcionada por el Sistema de Vigilancia de la Gripe en España y el Centro de Coordinación de Alertas y Emergencias del Ministerio de Sanidad y Política Social se han estimado una serie de indicadores epidemiológicos y virológicos para evaluar el nivel de actividad e intensidad de la onda pandémica, así como su gravedad. Resultados: La onda pandémica por el virus (H1N12009 se inició a comienzos del otoño de 2009 y registró valores máximos de incidencia de gripe de 372,15 casos semanales/100.000 habitantes. Las mayores tasas de incidencia de gripe se observaron en los menores de 15 años. La tasa de detección viral en el periodo pandémico se mantuvo en el rango de las registradas previamente (46,4%. Se estimó una tasa de letalidad global de 0,43 defunciones por 1.000 casos de gripe pandémica. Un 64% de las defunciones por gripe pandémica se registraron en adultos jóvenes, con máximas tasas de mortalidad en el grupo de 45-64 años (9,35 defunciones/1.000.000 habitantes. La mortalidad asociada a gripe estacional en el periodo 2001- 2008 fue máxima en los mayores de 64 años (95% del total de defunciones. Conclusiones: La onda pandémica por el virus de la gripe (H1N12009 tuvo una presentación precoz en España y una intensidad media en comparación con las trece ondas estacionales previas de gripe. Esta primera onda también se caracterizó por un carácter leve, teniendo en cuenta tasas de letalidad o mortalidad, si bien un elevado porcentaje de las defunciones confirmadas

  5. Fire Ant Bites

    Science.gov (United States)

    ... Favorite Name: Category: Share: Yes No, Keep Private Fire Ant Bites Share | Fire ants are aggressive, venomous insects that have pinching ... across the United States, even into Puerto Rico. Fire ant stings usually occur on the feet or ...

  6. Aplicación del modelo de Dorothea Orem ante un caso de una persona con dolor neoplásico

    Directory of Open Access Journals (Sweden)

    Miriam Paula Marcos Espino

    Full Text Available Desarrollo de un estudio del caso de una persona con dolor de tipo neoplásico a través de los pasos del proceso de Enfermería, basándonos para la valoración en el modelo de Dorothea Orem, relacionando los principales diagnósticos, criterios de resultados e intervenciones a desarrollar para aumentar la calidad de vida de la paciente en sus últimos meses de vida. Tras la valoración enfermera, se detecta un problema en el control y manejo del dolor que altera la calidad de vida de la paciente, así como la realización de las actividades de la vida diaria. Se pone en marcha un nuevo plan de terapia farmacológica controlada por la enfermera a través de un diario del dolor, así como el manejo de la analgesia. Conocer las desviaciones de la salud de nuestra paciente facilita el poder realizar las intervenciones y actividades acordes a dicha desviación, así como plantear nuevos objetivos en función de los avances o retrocesos que podremos conocer cuando evaluamos la ejecución de las intervenciones.

  7. Evaluación energética de motores asincrónicos ante armónicos y desbalance de voltaje en una empresa minera

    Directory of Open Access Journals (Sweden)

    Ignacio Romero-Rueda

    2012-04-01

    Full Text Available El propósito del artículo es exponer una variante para evaluar, en las empresas mineras de Moa, las prestaciones energéticas de motores asincrónicos partiendo de que la eficiencia de estos es afectada por niveles considerables de armónicos de varios órdenes provenientes de las fuentes de suministro eléctrico. El procedimiento se fundamenta en el método del momento en el entrehierro off line, en presencia de armónicos y desbalance de voltaje; permite determinar la potencia en el eje, el gráfico de la eficiencia y otros parámetros funcionales de motores eléctricos asincrónicos en condiciones de campo. La implementación del procedimiento ha reportado resultados satisfactorios al facilitar el desarrollo de programas de ahorro de energía con motores asincrónicos en las empresas mineras.

  8. Cuando el mundo le dio la espalda a una democracia. La diplomacia mexicana ante la desaparición de Checoslovaquia, 1938-1940

    Directory of Open Access Journals (Sweden)

    Guillermo López Contreras

    2012-01-01

    Full Text Available El servicio exterior mexicano fue muy activo durante el periodo de entreguerras en Europa, cuando México intentó aumentar el prestigio de los gobiernos emanados de la Revolución Mexicana. La historiografía ha señalado como un logro de estos gobiernos las denuncias hechas sobre las agresiones de diversas potencias a países más débiles. Sin embargo, la postura de lam diplomacia mexicana frente a la agresión nazi a Checoslovaquia no se había estudiado y no se conocía con certeza cuál era la postura mexicana. La actitud de México frente al reclamo alemán de la estratégica región checoslovaca de los Sudetes y frente a la desaparición definitiva de Checoslovaquia a manos del Tercer Reich, son algunos de los temas que aborda este artículo. Para ello, se analizan los reportes y comunicaciones que tuvo la red de representantes mexicanos en Europa con la Secretaría de Relaciones Exteriores mexicana, así como declaraciones y escritos de altos funcionarios mexicanos. La cuestión checoslovaca resultó ser una excepción a la política exterior mexicana basada en la seguridad colectiva y la denuncia a las agresiones ilegítimas.

  9. La vivienda ante emergencias

    Directory of Open Access Journals (Sweden)

    Arq. María Eugenia Gonzàlez Chipont

    2014-12-01

    Full Text Available Este trabajo propone analizar la evolución de la vivienda como respuesta ante emergencias desde principios del siglo XX hasta nuestros días. La secuencia de casos a analizar no sigue una cronología estricta sino que se organiza en función de un creciente grado de complejidad. Comienza con los aportes fundamentales de la vivienda mínima del movimiento moderno, con un fuerte acento en lo tecnológico, para ir profundizando, mientras avanzamos en el siglo, en los aspectos sociales de la arquitectura. Sin intentar oponer lo tecnológico y lo social, la estructura propuesta expresa un enriquecimiento de la cuestión técnica conforme se van ampliando sus objetivos sociales. Mientras los requerimientos tecnológicos como la inmediatez y la masividad de la respuesta, permanecen a lo largo del tiempo, la vivienda ante emergencias puede plantearse objetivos sociales cada vez más profundos. Los casos fueron elegidos a partir de autores renombrados de la Historia de la Arquitectura partiendo de ejemplos cercanos a la génesis del movimiento moderno para acercarnos cada vez más hacia el contexto actual de Latinoamérica. Se logra así un barrido geográfco pero principalmente cultural: desde las fuentes de la modernidad, bajo el paradigma sólido de la industrialización, hasta la inestabilidad de la ciudad posindustrial latinoamericana

  10. Hospitales seguros ante desastres

    Directory of Open Access Journals (Sweden)

    Celso Vladimir Bambaren Alatrista

    2007-07-01

    Full Text Available Entre 1982 a 2005 se registraron daños en 1 143 establecimientos de salud en el Perú, generalmente debido a sismos, lluvias e inundaciones. Los daños en los servicios de salud producen la interrupción de la atención de la población y de los programas de salud, así como generan un gran gasto para la rehabilitación y reconstrucción. Por ello, se requiere proteger a los establecimientos de salud y desarrollar una política de hospitales seguros ante desastres que incluya medidas para prevenir o reducción de la vulnerabilidad estructural, no estructural y funcional en los nuevos establecimientos y en los existentes.(Rev Med Hered 2007;18:149-154.

  11. HIV/AIDS Pandemia — a Problem Requiring Rethinking On the 30th Anniversary of the Discovery of Human Immunodeficiency Virus

    Directory of Open Access Journals (Sweden)

    M.V. Supotnitsky

    2014-09-01

    Full Text Available Hazard of HIV/AIDS pandemia is greatly underestimated due to lack of understanding of its role in the processes that are not related to medicine. The principal difference between HIV/AIDS pandemia and the pandemic processes, against which the advances were made in the ХХ century, lies in the fact that it is caused by a virus of the retrovirus family. Retroviruses are ancient tools of evolution. They cause epidemia (epizooty, which are the main mechanism of discontinuous evolution of species. This mechanism is implemented by endogenization of retroviruses in the genome of the surviving species and amplification of their genome through the formation of new copies of retroelements; complexity of the genome by the formation of new exons from introns and/or increased number of genes that are alternatively spliced. Evolutionary past of the immune system of multicellular organisms suggests securing her in the process of natural selection as the reservoir with respect to retroviruses. Thanks to the cells of the immune system there is the multiplication and accumulation of exogenous retroviruses to a certain critical mass, which allows some of them to endogenize in the germline of some specimens of infected species and further transmitted vertically, changing its evolutionary trajectory. HIV/AIDS pandemia among the species homo sapiens — a common manifestation of this process in the evolution of primate taxon. Infectious and epidemic processes caused by HIV, are multicomponent non-cyclic processes that have no mechanisms for termination. To fight with them, experience gained in the XX century during smallpox eradication or in when controlling outbreaks of influenza, plague and other cyclical infections is inapplicable. Given in the article data indicate the need to develop self-control strategy to fight against non-cyclic multicomponent epidemic processes.

  12. La escritura como espada ante el machismo

    OpenAIRE

    Rottoli, Sofía

    2016-01-01

    Cuando se trata de expresar una postura que abarque una temática demasiado amplia o controversial, recurrir a la escritura puede ser una buena opción de abordaje. Sobre todo cuando son discusiones que llevan años de vigencia. Las luchas feministas ante la violencia de género no son una excepción. Sus discusiones siempre tuvieron presencia en diversos campos, uno de ellos es la ya mencionada escritura. Centro de Investigación en Lectura y Escritura (CILE)

  13. Pandemia influenza A/H1N1 2009 em Portugal : estratégias de intervenção e saúde pública

    OpenAIRE

    Pinto, Carla Cristina Clemente Rodrigues

    2011-01-01

    RESUMO - Introdução: A necessidade de gestão da ameaça de uma pandemia obriga à gestão da incerteza absoluta. O desconhecimento científico quanto a uma série de factores tais como, as características dos vírus causadores de infecções, a efectividade das medidas de prevenção e de tratamento, contribuiu para a dificuldade de actuação a vários níveis. Face à evolução da situação epidemiológica mundial no campo da gripe, Portugal reviu e adaptou o seu plano de contingência para a g...

  14. Conocimientos y prácticas sobre la prevención y el control de la influenza AH1N1 en una comunidad de Floridablanca, Santander

    OpenAIRE

    María Paula Sarmiento; Oliverio Suárez; Jesús Antonio Sanabria; Cristhian Eduardo Pérez; Laura del Pilar Cadena; María Eugenia Niño

    2011-01-01

    Introducción. La influenza AH1N1 generó una pandemia durante el año 2009, para la cual los gobiernos de todo el mundo desarrollaron medidas de mitigación y control de la propagación. En el departamento de Santander se pusieron en práctica planes de prevención orientados a la comunidad. Objetivo. Evaluar los conocimientos y prácticas de la población sobre la prevención y control de la pandemia de influenza AH1N1. Materiales y métodos. Se trató de un estudio transversal con muestreo no pr...

  15. Ant- and Ant-Colony-Inspired ALife Visual Art.

    Science.gov (United States)

    Greenfield, Gary; Machado, Penousal

    2015-01-01

    Ant- and ant-colony-inspired ALife art is characterized by the artistic exploration of the emerging collective behavior of computational agents, developed using ants as a metaphor. We present a chronology that documents the emergence and history of such visual art, contextualize ant- and ant-colony-inspired art within generative art practices, and consider how it relates to other ALife art. We survey many of the algorithms that artists have used in this genre, address some of their aims, and explore the relationships between ant- and ant-colony-inspired art and research on ant and ant colony behavior.

  16. Riding with the ants

    NARCIS (Netherlands)

    Duarte, A. P. M.; Attili-Angelis, D.; Baron, N. C.; Groenewald, Johannes Z.; Crous, Pedro W.; Pagnocca, F. C.

    Isolates of Teratosphaeriaceae have frequently been found in the integument of attine ants, proving to be common and diverse in this microenvironment. The LSU phylogeny of the ant-isolated strains studied revealed that they cluster in two main lineages. The first was associated with the genus

  17. Evaluación de una prueba de ELISA con antígeno metabólico de Fasciola hepatica para el diagnóstico de fasciolosis humana en Cajamarca, Perú Evaluation of an ELISA test with Fasciola hepatica metabolic antigen for diagnosis of human fascioliasis in Cajamarca, Peru

    Directory of Open Access Journals (Sweden)

    Hernán Cornejo

    2010-12-01

    Full Text Available Se obtuvo el antígeno metabólico (antígeno excreción - secreción de Fasciola hepatica de ovinos infectados de Cajamarca, con una concentración proteica de 1 005 μg/μL, compuesta principalmente por proteνnas de peso molecular entre 1,2 y 170 KDa. Se detectaron bandas de 170; 150; 31; 24; 18-14 y 10 kDa. Con este antνgeno se desarrollσ una prueba de ELISA y se determinσ su punto de corte en 0,140. Se evaluσ 33 sueros de pacientes con fasciolosis confirmada por visualización de huevos en heces, 177 sueros de pacientes sin fasciolosis provenientes de áreas endémicas de Cajamarca y 88 sueros de pacientes con otras infecciones parasitarias y bacterianas. Se encontró una sensibilidad de 97,0%, especificidad de 96,6%, valor predictivo positivo de 78,1% y valor predictivo negativo de 99,6%. Se encontró reacción cruzada en 9/88 sueros evaluados. Se recomienda la implementación y uso de esta prueba para el diagnóstico de fasciolosis.Metabolic (excretion/secretion antigen was obtained from sheep infected with Fasciola hepatica, with a 1005 μg/μL of protein concentration, composed principally by proteins of molecular weight between 1.2 and 170 KDa. Bands of 170, 150, 31, 24, 18-14 and 10 kDa were detected. With this antigen an ELISA test was developed and the cut off was determined in 0.140. We evaluated 33 serums of patient with fascioliasis confirmed by visualization of eggs in feces, 177 serums of persons without fascioliasis from endemic rural areas of Cajamarca and 88 serums of patients with others parasitic and bacterial infections. We found a 97.0% of sensitivity, 96.6 specificity, 78.1% predictive positive value, 99.6 % predictive negative value. In 9/88 serums was found cross reactions. We recommended the implementation and use of this test for the fascioliasis diagnosis.

  18. Opciones reales como respuesta ante la valoración con flujo de caja libre en situaciones de incertidumbre: Caso de la compra de maquinaria en una empresa colombiana de consumo masivo

    OpenAIRE

    Donato Valdés, Nathalie; Forero Díaz, Nicolás

    2017-01-01

    El alto grado de incertidumbre de la economía actual impone retos y riesgos a las finanzas corporativas de cualquier compañía -- Encontrar alternativas que permitan la flexibilización de los modelos de evaluación de proyectos empresariales se constituye, en este sentido, en una de sus máximas tareas -- Una de estas alternativas es el método de valoración por Opciones Reales -- El presente estudio aplica dicho método a un proyecto de inversión en innovación tomando el caso de la compra de una ...

  19. A methodology for obtaining the control rods patterns in a BWR using systems based on ants colonies; Una metodologia para obtener los patrones de barras de control en un BWR usando sistemas basados en colonias de hormigas

    Energy Technology Data Exchange (ETDEWEB)

    Ortiz S, J.J. [Depto. de Sistemas Nucleares, ININ, 52045 Ocoyoacac, Estado de Mexico (Mexico); Requena R, I. [Universidad de Granada, 18071 Granada (Spain)]. e-mail: jjortiz@nuclear.inin.mx

    2003-07-01

    In this work the AZCATL-PBC system based on a technique of ants colonies for the search of control rods patterns of those reactors of the Nuclear Power station of Laguna Verde (CNLV) is presented. The technique was applied to a transition cycle and one of balance. For both cycles they were compared the k{sub ef} values obtained with a Haling calculation and the control rods pattern proposed by AZCATL-PBC for a burnt one fixed. It was found that the methodology is able to extend the length of the cycle with respect to the Haling prediction, maintaining sure to the reactor. (Author)

  20. Hallazgo de antígenos en un tumor murino espontáneo no inmunogénico mediante el uso de una vacuna basada en células dendríticas Unveiling antigens in a non-immunogenic spontaneous murine tumor using a dendritic cell-based vaccine

    Directory of Open Access Journals (Sweden)

    Verónica L. Reffo

    2008-08-01

    Full Text Available La inmunoterapia sería un tratamiento ideal contra el cáncer porque combina eficacia y especificidad, pero hasta hoy no ha dado resultados exitosos contra tumores establecidos. En este trabajo abordamos el problema de la falta de inmunogenicidad de los tumores espontáneos como una posible causa del fracaso de la inmunoterapia. Nos preguntamos si esta falta de inmunogenicidad se debe a la ausencia de antígenos o a la existencia de mecanismos tolerogénicos que impiden a esos antígenos iniciar una respuesta inmune. Para deslindar entre ambas alternativas, utilizamos dos tumores murinos -uno espontáneo y no inmunogénico (linfoma LB y otro inducido por metilcolantreno y fuertemente inmunogénico (fibrosarcoma MC-C- y la técnica de inmunización con células dendríticas (DC estimuladas con extracto acelular de tumor. Al estimular DC in vitro con extracto de LB, las DC no exhibieron maduración ni inmunizaron in vivo contra implantes de LB. Por otro lado, extractos de MC-C, hicieron madurar las DC y las convirtieron en poderosas vacunas contra implantes de MC-C pero no de LB, indicando que MC-C y LB no tienen antígenos compartidos. Por último, cuando DC fueron estimuladas con una mezcla de los extractos de LB y MC-C, expresaron marcadores de maduración y exhibieron capacidad vacunante contra LB. Estos resultados sugieren que el tumor LB tiene antígenos específicos de tumor pero carece de otras señales necesarias para la maduración de las DC. Estas señales serían aportadas por el extracto de MC-C, permitiendo de este modo iniciar una respuesta inmune contra LB.Up to date, most attempts to use immunotherapy to cause the regression of animal and human established tumors have not been successful. Former experiments have postulated that this failure could be attributed, at least in part, to a lack of immunogenicity of spontaneous tumors. In this paper, we have investigated whether this lack of immunogenicity can be attributed to the

  1. [Theory humoral pathology K Rokitansky, cellular phathology R Virchov and new phylogenetic theory disease development. Ethyology and pathogenesis of metabolic pandemias].

    Science.gov (United States)

    Titov, V N

    2013-01-01

    Virchow's cellular pathology indirectly points at structural units between cells and organs in vivo and at universal mechanisms underlying the condition of health or disease. In order to substantiate similarity of pathogeneses of atherosclerosis, diabetes mellitus, metabolic syndrome and obesity we suggest a phylogenetic theory which includes: 1) consideration of physiological and pathological processes in vivo from the viewpoint of biological functions and biological reactions. 2) Phylogenesis of metabolic regulation at the levels of: a) cells (autocrine), b) paracrine cell communities, i.e., structural and functional units of each organ (paracrine), and c) the entire organism. Biological functions are: trophology, homeostasis, endoecology ( of the intercellular medium), adaptation, locomotion, reproduction, and cognition. 3) A three-step successive phylogenesis of biological functions and pathological responses. Methodological approaches in phylogenesis are: a) succession of biological functions and reactions and b) biological subordination where phylogenetically late humoral mediators cannot abolish the effects of phylogenetically early mediators. Incompliance of humoral regulation at different steps of phylogenesis, autocrine, paracrine and the organism levels is the basis for similarity between pathogeneses of all metabolic pandemias, including essential hypertension and insulin resistance syndrome.

  2. Sick ants become unsociable

    DEFF Research Database (Denmark)

    Bos, Nicky Peter Maria; Lefevre, T.; Jensen, A.B.

    2012-01-01

    Parasites represent a severe threat to social insects, which form high-density colonies of related individuals, and selection should favour host traits that reduce infection risk. Here, using a carpenter ant (Camponotus aethiops) and a generalist insect pathogenic fungus (Metarhizium brunneum), we...... show that infected ants radically change their behaviour over time to reduce the risk of colony infection. Infected individuals (i) performed less social interactions than their uninfected counterparts, (ii) did not interact with brood anymore and (iii) spent most of their time outside the nest from...... day 3 post-infection until death. Furthermore, infected ants displayed an increased aggressiveness towards non-nestmates. Finally, infected ants did not alter their cuticular chemical profile, suggesting that infected individuals do not signal their physiological status to nestmates. Our results...

  3. Actitudes y comportamientos preventivos durante la pandemia degripe (H1N1 2009 en España

    Directory of Open Access Journals (Sweden)

    Fernando Agüero Santagelo

    2011-01-01

    Full Text Available Fundamentos: En la primavera de 2009 la aparición del nuevo virus de la gripe (H1N1 2009 causó una enorme alarma social. El objetivo de este estudio es describir los conocimientos y las percepciones de riesgo sobre la enfermedad y su vacuna así como las medidas preventivas adoptadas por la población general en España. Métodos: Encuesta telefónica en dos oleadas a una muestra de teléfonos fijos con cuotas por edad, sexo, Comunidades Autonómicas y tamaño de municipio. El cuestionario incluía preguntas sobre percepciones, medidas preventivas y vacunación contra la gripe (H1N1 2009. Se realizó un análisis estadístico descriptivo de las principales variables del estudio y se aplicó la prueba chi-cuadrado para estudiar la relación estadística para datos categóricos. Resultados: Respondieron el cuestionario 1.627 personas. 823 (51,6% eran mujeres; 502 (30,9% tenían entre 18 y 35 años y 580 (35,6% entre 35 y 55. 729 (49,1% eran trabajadores manuales y 857 (52,7% vivían en municipios de más de 50.000 habitantes. Únicamente un 15,7% de los que respondieron se sentía a riesgo de contraer la enfermedad, percepción que disminuyó al 3,9% en la segunda oleada, tra el pico epidémico. En conjunto, más del 80% (n=1.353 pensaba que se había generado alarma social, y el 77% adoptó al menos una medida preventiva. Las medidas preventivas más frecuentemente adoptadas fueron cubrirse la boca y la nariz con un pañuelo al toser o estornudar (n=951 ; 58,5% y la higiene de manos (n= 624 ; 38,4%. Conclusión: Las principales medidas adoptadas fueron las recomendadas por las autoridades sanitarias.

  4. The role of high-fat diet in an APP/PS1 model of familial Alzheimer disease = Efecto de una dieta rica en grasas en ratones APP/PS1, modelo familiar de la enfermedad de Alzheimer

    OpenAIRE

    Petrov, Dmitry

    2015-01-01

    La obesidad es una pandemia mundial, la cual según estudios recientes afecta a más de 2.000 millones de personas en todo el mundo y conlleva una fuerte presión de los sistemas sanitarios globales. El problema se ve aumentado no sólo por los costes directos asociados al sobrepeso, sino también por las comorbilidades relacionadas, entre ellas el incremento del riesgo de desarrollo de enfermedades neurodegenerativas, como por ejemplo la enfermedad de Alzheimer (EA), principal causa de demencia s...

  5. Posturas de política monetaria ante fluctuaciones de la economía: una revisión de la evolución teórica

    Directory of Open Access Journals (Sweden)

    José Mauricio Gil León

    2015-11-01

    Full Text Available En este artículo se hace una exploración a las posturas de políticamonetaria desde diferentes corrientes de pensamiento económico, las cuales pueden ligarse al comportamiento de la estabilidad del ciclo económico y financiero. Por tanto, parte de la discusión tradicional entre no intervencionismo e intervencionismo; en la primera visión se encuentran los autores clásicos y neoclásicos, con la creencia de que el dinero solo tiene efecto sobre los precios,y dentro de la segunda, Keynes postula la necesidad de un activismo monetario. No obstante, la década de los años setenta marca el principio de la neutralidad del dinero, la que domina en las decisiones de política monetaria, para que luego, en los años noventa, sea aceptado el ciclo económico dentro de la regla de política. Finalmente, el texto analiza cómo con la crisis del 2008 sale a flote una postura de política no convencional, que se transforma en el marco de política para la recuperación económica y se abre el debate acerca del uso de una política macroprudencial por parte de los bancos centrales.

  6. Diseño e implementación de un sistema para visualizar la marcha humana biomecánica en la afectación de rodilla ante una gonartrosis

    OpenAIRE

    Terán Pineda, Diego Francisco

    2017-01-01

    El presente trabajo acomete el desarrollo e implementación de un sistema para visualizar la marcha biomecánica humana de la rodilla en la zona sagital mediante sensores para visualizar la afectación de la gonartrosis en la marcha. Se usaron dos sensores inerciales para adquirir las señales correspondientes al ángulo generado entre la pierna y el muslo los cuales fueron procesados en una tarjeta de desarrollo – Arduino uno. Para el filtrado de la señal del acelerómetro se ha aplicado el algori...

  7. Commentary: Warring ants

    Indian Academy of Sciences (India)

    Home; Journals; Journal of Biosciences; Volume 27; Issue 2. Commentary: Warring ants: Lessons from Lanchester's laws of combat? Renee M Borges. Volume 27 Issue 2 March 2002 pp 75-78. Fulltext. Click here to view fulltext PDF. Permanent link: https://www.ias.ac.in/article/fulltext/jbsc/027/02/0075-0078 ...

  8. Antílope

    Directory of Open Access Journals (Sweden)

    Pedro Anderson Martinho Moçambique

    2015-10-01

    Full Text Available Essa espécie de antílope só é encontrada em território angolano, sendo assim um símbolo nacional. Segundo a mitologia africana é símbolo de vivacidade, velocidade e beleza - Angola.

  9. Antílope

    Directory of Open Access Journals (Sweden)

    Pedro Anderson Martinho Moçambique

    2011-04-01

    Full Text Available Essa espécie de antílope só é encontrada em território angolano, sendo assim um símbolo nacional. Segundo a mitologia africana é símbolo de vivacidade, velocidade e beleza - Angola.

  10. Fire Ant Allergy

    Science.gov (United States)

    ... venom in a fire ant sting will kill bacteria and some of your skin cells. This results in the formation of a blister that fills with a cloudy white material in about 24 hours. While this looks like a pus-filled lesion that should be drained, ...

  11. Geomarketing en salud para ubicar oferta de servicios médicos de valor. Caso: Proyecto de investigación para ubicar una nueva oferta hospitalaria

    OpenAIRE

    Luis Alfonso Pérez Romero

    2008-01-01

    El geomarketing de la salud es útil para definir políticas sanitarias y buscar un mayor bienestar bio-psico y social de las personas que cohabitan un mismo espacio geográfico. Los límites de división geográfica y política entre comunidades son importantes para el control y manejo de epidemias, endemias y pandemias. La ubicación geográfica (espacio que ocupa una persona y sus pares) en un tiempo definido, nos muestra perfiles culturales similares, manifiestos en hábitos, costumbres y patrones ...

  12. Productividad y análisis económico de una pastura consociada de Trifolium Repens l. y Dactylis Glomerata l. ante diferentes condiciones de transmisividad lumínica

    Directory of Open Access Journals (Sweden)

    Bárbara Camila Alvarez Oyarzo

    2014-06-01

    Full Text Available Con el objetivo de aportar información referida al rendimiento de una pastura, que creció bajo distintos niveles de sombra se realizó un ensayo comparativo de rendimiento, en el que se evaluó la productividad de materia seca y su distribución durante la temporada de crecimiento. Además se realizó un análisis económico de la práctica de siembra y de la confección de reservas forrajeras, utilizando datos del ensayo e información local referida al rendimiento de cultivos y empleo de maquinarias agrícola. El ensayo comparativo de rendimiento se instaló en el sudoeste de Santa Cruz y consistió en un diseño en bloques completos aleatorizados. En el análisis económico se calcularon los indicadores, margen bruto, rendimiento de indiferencia, retorno por peso invertido, valor actual neto y tasa interna de retorno. Se demostró que el máximo rendimiento se obtuvo con un 50% de cobertura en pasturas mixtas, la productividad se concentró hacia el primer corte. El análisis económico indica que la siembra de pasturas y confección de reservas forrajeras es una actividad con rentabilidad positiva, mayor que algunas opciones financieras que ofrece el mercado en la región.

  13. "Ant-egg" cataract revisited

    DEFF Research Database (Denmark)

    Clemmensen, Kåre; Enghild, Jan J; Ivarsen, Anders

    2017-01-01

    -ray scans and electron microscopy. The purpose of this study was to further characterize "ant-egg" cataract using modern technology and display the history of the "ant-eggs" after cataract extraction. METHODS: "Ant-eggs" were examined using Heidelberg SPECTRALIS Optical Coherence Tomography (OCT...

  14. Ant Colony Optimization for Control

    NARCIS (Netherlands)

    Van Ast, J.M.

    2010-01-01

    The very basis of this thesis is the collective behavior of ants in colonies. Ants are an excellent example of how rather simple behavior on a local level can lead to complex behavior on a global level that is beneficial for the individuals. The key in the self-organization of ants is communication

  15. Polimorfismo de los alelos de los antígenos de leucocitos humanos HLA-DRB1 y su asociación con la artritis reumatoidea juvenil en una muestra de niños mestizos colombianos.

    Directory of Open Access Journals (Sweden)

    Gloria Garavito

    2003-09-01

    Full Text Available Se buscó tipificar molecularmente los alelos de los antígenos de leucocitos humanos HLADRB1 en un grupo de niños mestizos colombianos (población resultante de la mezcla genética de amrindios, europeos y africanos con artritis reumatoidea juvenil (ARJ, así como analizar su frecuencia de expresión y compararla con sujetos clínicamente normales e investigar la asociación entre la frecuencia de los alelos con los diferentes subgrupos clínicos de ARJ. El estudio involucró 65 pacientes con ARJ y 65 controles sanos. La tipificación de los alelos HLADRB1 se realizó por medio de la metodología de la reacción en cadena de la polimerasa con sondas de oligonucleótidos de secuencias específicas (PCR-SSOP, utilizando el protocolo recomendado por el XII International Histocompatibilty Workshop, realizado en St. Malo, París, en 1996. Los alelos HLADRB1* 1104 (prueba exacta de Fisher, PEF=0,013, OR=16,79, frecuencia etiológica (FE=0,93 y DRB1*1602 (PEF=0,016, OR=8,98, FE=0,88 se evidenciaron como marcadores de susceptibilidad. HLA-DRB1*1501 (FP=0,466; p=0,005 y HLA DRB1*1402 (FP=0,49; p=0,009 se comportaron como alelos asociados con protección. Al comparar las asociaciones entre alelos y los diferentes subgrupos clínicos se encontró asociación entre ARJ oligoarticular con HLA-DRB1* 1104 (p=0,0034, OR=41,53 , FE=0,97, la ARJ poliarticular se asoció con el alelo HLADRB1* 0404 (p=0,012, OR=8,75, FE=0,88 y en el grupo sistémico, el alelo más expresado fue el HLA-DRB1*1602 (p=0,005, OR=21,33, FE=0,95. La presencia de factor reumatoide estuvo asociado con los alelos HLA-DRB1*0407 (p=0,05, OR=11,2, FE=0,45 y HLA-DRB1*1302 (p=0,02, OR=22,8, FE=0,63. En el grupo de pacientes con ANA+, sólo hubo significancia estadística para el alelo HLA-DRB1* 0701 (p=0,001, OR=58, FE=0,73. Nuestros resultados sugieren que los genes del MHC en este subgrupo étnico inciden no sólo en la susceptibilidad a desarrollar ARJ sino también en la expresión cl

  16. Runtime analysis of the 1-ANT ant colony optimizer

    DEFF Research Database (Denmark)

    Doerr, Benjamin; Neumann, Frank; Sudholt, Dirk

    2011-01-01

    The runtime analysis of randomized search heuristics is a growing field where, in the last two decades, many rigorous results have been obtained. First runtime analyses of ant colony optimization (ACO) have been conducted only recently. In these studies simple ACO algorithms such as the 1-ANT...... that give us a more detailed impression of the 1-ANT’s performance. Furthermore, the experiments also deal with the question whether using many ant solutions in one iteration can decrease the total runtime....

  17. The metapleural gland of ants

    DEFF Research Database (Denmark)

    Yek, Sze Huei; Mueller, Ulrich G

    2011-01-01

    The metapleural gland (MG) is a complex glandular structure unique to ants, suggesting a critical role in their origin and ecological success. We synthesize the current understanding of the adaptive function, morphology, evolutionary history, and chemical properties of the MG. Two functions......-compressible invagination of the integument and the secretion is thought to ooze out passively through the non-closable opening of the MG or is groomed off by the legs and applied to target surfaces. MG loss has occurred repeatedly among the ants, particularly in the subfamilies Formicinae and Myrmicinae, and the MG...... is more commonly absent in males than in workers. MG chemistry has been characterized mostly in derived ant lineages with unique biologies (e.g. leafcutter ants, fire ants), currently precluding any inferences about MG chemistry at the origin of the ants. A synthetic approach integrating functional...

  18. Fotoprotección antioxidante no-enzimática contra el potencial daño inducido por UVBR en una diatomea antártica (Thalassiosira sp. Non-enzymatic antioxidant photoprotection against potential UVBR-induced damage in an Antarctic diatom (Thalassiosira sp.

    Directory of Open Access Journals (Sweden)

    Marcelo Hernando

    2011-11-01

    Full Text Available In January 1999, unialgal cultures of the diatom Thalassiosira sp., solate from natural phyto-plankton assemblages from Potter Cove, Antarctica, were exposed to solar ultraviolet radiation (UVR, 280400 nm in order to study the long-term acclimation of this species. Ultraviolet radiation B (UVBR, 280-315 nm inhibited the growth rate during the first and second days of exposure. No UVBR inhibition was observed on the third day. The initial content of α-tocopherol (13 pmol (10(4 cell-1 showed a marked decrease during the exponential growth phase (4 pmol (10(4 cell-1 by day 3. The initial content of β-carotene (3 pmol (10(4 cell-1 did not show significant differences over time in cells exposed to UVBR. Two mycosporine-like amino acids (MAAs were identified: porphyra-334 and shinorine. Cellular concentrations of MAAs increased significantly on days 2 and 3, and exposure of the algae to UVBR significantly enhanced this value. The relative importance of MAAs concentration was significant (P Durante enero 1999, cultivos unialgales de una diatomea Thalassiosira sp., aislada de poblaciones fitoplanctónicas naturales de Caleta Carlos Potter, Antártida, fueron expuestos a radiación solar ultravioleta (UVR, 280-400 nm con el objetivo de estudiar su aclimatación a largo plazo. La radiación ultravioleta B (UVBR, 280-315 nm inhibió la tasa de crecimiento durante el primer y segundo día de exposición. No se observó inhibición por UVBR durante el tercer día. El contenido inicial de α-tocopherol (13 pmol (10(4 cel-1 mostró una marcada disminución durante la fase de crecimiento exponencial (4 pmol (10(4 cel-1 al día 3. El contenido inicial de β-caroteno (3 pmol (10(4 cel-1 no mostró diferencias significativas entre días en células expuestas a UVBR. Se identificaron dos aminoácidos parecidos a micosporina (MAAs, porfira-334 y shinorina. Las concentraciones celulares de MAAs mostraron aumentos significativos en los días 2 y 3, que resultaron

  19. Pest repellent properties of ant pheromones

    DEFF Research Database (Denmark)

    Offenberg, Joachim

    2012-01-01

    of ant pheromones may be sufficient to repel pest insects from ant territories. The study of ant semiochemicals is in its infancy, yet, evidence for their potential use in pest management is starting to build up. Pheromones from four of five tested ant species have been shown to deter herbivorous insect...... prey and competing ant species are also deterred by ant deposits, whereas ant symbionts may be attracted to them. Based on these promising initial findings, it seems advisable to further elucidate the signaling properties of ant pheromones and to test and develop their use in future pest management....

  20. Antártica: fuente de recursos biológicos para la biotecnología nacional

    OpenAIRE

    Blamey, J.

    2008-01-01

    En diciembre del 2007, Innova-Chile de CORFO aprobó el financiamiento del proyecto “Antártica: Fuente de recursos biológicos para la biotecnología nacional”. Este proyecto tiene como fin crear una plataforma que facilite el acceso a los recursos antárticos de microorganismos y plantas, de una forma que permitirá su valorización para la biotecnología chilena y su desarrollo científico en el área. Por sus únicas condiciones de aislamiento y bajas temperaturas, la Antártica alberga un potencial ...

  1. La política nacional del Ecuador para la Antártica y sus mecanismos de aplicación

    OpenAIRE

    Moreano, H.R.

    1989-01-01

    La Primera Expedición Ecuatoriana a la Antártica condujo una serie de observaciones científicas en el Paso Drake y Estrecho Bransfield durante el verano austral 1987-88, cuyos resultados se prublicaron en el "Acta Antártica Ecuatoriana" en marzo 89, de esta manera el Ecuador hacía realidad sus intereses en la Antártica. Se propone un concepto de la Política Nacional para la Antártica, basada en los lineamientos y consideraciones del Tratado Antártico y sus convenciones, así como también sus m...

  2. Emociones y prácticas ante una contingencia sanitaria

    Directory of Open Access Journals (Sweden)

    Anna Fernández Poncela

    2009-12-01

    Full Text Available En este trabajo reflexionamos en torno a la relación entre emociones y cultura, sentimientos, discursos y prácticas sociales. Un ejemplo de caso: la contingencia sanitaria en México causada por el virus de influenza humana A H1N1 en la primavera del año 2009.  Fecha de recepción: 13 octubre 2009. Fecha de aceptación: 22 de noviembre 2009.

  3. Nace una alternativa ante los tiempos de cambio

    Directory of Open Access Journals (Sweden)

    Loza-Murguia Manuel G.

    2013-11-01

    Full Text Available Journal of the Selva Andina Biosphere (JSAB, órgano oficial de Selva Andina Research Society “S.A.R.S”, Departamento de Enseñanza e Investigación en Bioquímica & Microbiología (D.E.I. & B.M., de la Universidad Católica Boliviana San Pablo, en convenio con la Carrera de Ingeniería Agronómica de la Universidad Pública de El Alto (UPEA, de la Unidad Académica Campesina de Tiahuanacu, Carmen Pampa, Fundación PROINPA, el Instituto Nacional de Innovación Agropecuaria y Forestal (INIAF, la Facultad de Ciencias Agrarias de la Universidad Nacional del Altiplano de Puno - Perú a partir de la gestión 2013, forma parte de la OJS Open Journal Systems. Red de publicación electrónica de revisas en Internet, responde a los requerimientos de países de América Latina y el Caribe, como apoyo a la comunicación científica, proporcionando visibilidad y acceso la literatura científica, respetando metodología común en la preparación, almacenamiento, divulgación y evaluación de artículos científicos en formato electrónico. OJS – Bolivia fue hecha realidad gracias a la participación de diferentes instituciones como la Universidad Mayor de San Andrés, el Programa de Investigación Estratégica en Bolivia, la Universidad Católica Boliviana, la Asociación Boliviana de Editores de Revistas Biomédicas y el Viceministerio de Ciencia y Tecnología con el apoyo de la Organización Panamericana de Salud (OPS Representación Bolivia. Al ser parte de este proyecto Journal of the Selva Andina Biosphere a OJS-Bolivia, y cumplir con los requisitos necesarios en los criterios, política y procedimientos para la postulación, aceptación y permanencia de revistas científicas en la colección OJS - Bolivia, logro anhelado por el Presidente Honorario – Ejecutivo de la Junta Directiva del Consejo Superior de Investigación en Ciencia & Biotecnología de Selva Andina Research Society, deja abierto este espacio para que Investigadores, Profesionales, Estudiantes de Postgrado, Pregrado, e Instituciones Públicas y Privadas Nacionales y de todo el Mundo, para que envíen sus manuscritos y ser publicados, pues contamos con profesionales de reconocido prestigio tanto nacionales como extranjeros que garantizarán el arbitraje y por ende la calidad de la publicación. El Presidente Honorario-Ejecutivo de la Junta Directiva del Consejo Superior de Investigación en Ciencia & Biotecnología de Selva Andina Research Society y el Director y Editor en Jefe de la Revista Journal of the Selva Andina Biosphere hace extensiva esta invitación.

  4. A cellular automata model for ant trails

    Indian Academy of Sciences (India)

    In this study, the unidirectional ant traffic flow with U-turn in an ant trail was inves- tigated using ... the literature, it was considered in the model that (i) ant colony consists of two kinds of ants, good- ... ponents without a central controller [8].

  5. ANT, tourism and situated globality

    DEFF Research Database (Denmark)

    Jóhannesson, Gunnar Thór; Ren, Carina Bregnholm; van der Duim, René

    2015-01-01

    viable descriptions of the collective condition of humans and more-than-humans in the Anthropocene. Also and moving past a merely descriptive approach, it discusses it as a useful tool to engage with the situated globalities which come into being through the socio-spatial coupling of tourism......In recent years Actor-network theory (ANT) has increasingly been felt in the field of tourism studies (Van der Duim, Ren, & Jóhannesson, 2012). An important implication of the meeting between ANT and tourism studies is the notion of tourism being described as a heterogeneous assemblage of what we...... are used to define as the separate spheres of nature and culture. This paper explores and relates the central tenets of ANT in tourism with regard to the concept of the Anthropocene. It presents the ANT approach as a flat and object-oriented ontology and methodology and explores its potentials to carve out...

  6. Ants Orase kultuurisõnum

    Index Scriptorium Estoniae

    2007-01-01

    26. jaanuaril toimub Tallinna Ülikooli Akadeemilises Raamatukogus seminar silmapaistvast Eesti teadlasest ja tõlkijast Ants Orasest. Esinevad kirjandusteadlased Tallinna Ülikoolist, Tartu Ülikoolist ja Eesti Kirjandusmuuseumist. Avaettekandeks on sõna Oklahoma Ülikooli professoril Vincent B. Leitchil, kes oli Ants Orase viimaseks juhendatavaks doktorandiks. Seminari korraldavad Tallinna Ülikool ja Eesti Kirjandusmuuseum. Vt ka Postimees, 26, jaan., lk. 18

  7. Metodología para determinar la respuesta de los descargadores gaseosos tripolares ante una tensión de impulso dinámico; Test Methodology for Determining the Tripolar Gaseous Discharges Response when a Dynamic Impulse Voltage Is Applied

    Directory of Open Access Journals (Sweden)

    José Á Martínez Barbado

    2011-02-01

    Full Text Available Las protecciones utilizadas contra las sobretensiones y sus efectos secundarios provocados por losfenómenos  electroatmosféricos,  son  de  vital  importancia  en  un  mundo  en  el  que  por  su  desarrollotecnológico, se requiere de protecciones con un alto nivel de fiabilidad. En este artículo se presenta unametodología para la ejecución del ensayo de tensión de impulso dinámico a descargadores gaseosostripolares que son utilizados para proteger las tarjetas de abonados contra sobretensiones, las cuales seinstalan en las plantas telefónicas del país. Dicha metodología se dirige a obtener y comprobar losvalores de tensión de corte y sus tolerancias con los especificados por el fabricante. Se realiza unestudio comparativo del comportamiento entre un grupo de descargadores nuevos y otro sin usar, a partirde una problemática concreta, con el valor de ruptura de corte dado por un fabricante y ante la aplicaciónde tensión de impulso dinámico. El análisis comparativo se lleva a cabo mediante la técnica estadísticade detección de diferencias estadísticamente significativas entre los valores medios de ruptura obtenidos.  The protection used against the overvoltage and their secondary effect produced by electro-atmosphericphenomena, results very important due to worldwide technologic development, therefore a protection witha high reliability level are required. This paper presents a methodology for carrying out the dynamicimpulse voltage test to tripolar gaseous discharges that are used to protect the subscribers' cards againstovervoltages, which are installed in the telephonic plant of the country. This methodology permits toobtain and check the disrupt voltage values and this tolerances in reference to the specified by themanufacturer. It is perform a comparative study of the behavior between a group of not used dischargesand other used, based in an actual doubtful, with the specified by the manufacturer and when

  8. Hegel ante la modernidad

    OpenAIRE

    Giusti, Miguel

    2013-01-01

    Hegel es uno de los primeros filósofos podemos que toma distancia frente al sentimiento triunfalista de su época, pero sin desconocer la originalidad de las nuevas formas de pensamiento e innovación política. A su filosofía debemos una caracterización conceptual de la modernidad en su conjunto gracias a la conciencia histórica con que ésta es juzgada. Lo propio y esencial de los tiempos modernos es, para Hegel, el principio de la subjetividad". El trabajo se divide en dos partes: primeramente...

  9. Using Ants as bioindicators: Multiscale Issues in Ant Community Ecology

    Directory of Open Access Journals (Sweden)

    Alan Andersen

    1997-06-01

    Full Text Available Ecological patterns and processes are characteristically scale dependent, and research findings often cannot be translated easily from one scale to another. Conservation biology is challenged by a lack of congruence between the spatial scales of ecological research (typically involving small plots and land management (typically involving whole landscapes. Here, I discuss spatial scaling issues as they relate to an understanding of ant communities and, consequently, their use as bioindicators in land management. Our perceptions of fundamental patterns and processes in ant communities depend on scale: taxa that are behaviorally dominant at one scale are not necessarily so at others, functional groups recognized at one scale are often inappropriate for others, and the role of competition in community structure depends on the scale of analysis. Patterns of species richness and composition, and the ability of total richness to be estimated by surrogates, are all also scale dependent. Ant community ecology has a tradition of detailed studies in small plots, but the use of ants as bioindicators requires a predictive understanding of community structure and dynamics at a range of spatial scales. Such an appreciation of ant communities and their most effective use as bioindicators is best served by studies integrating results from plot-scale research with the broad-scale paradigms of biogeography, systematics, and evolutionary biology.

  10. Monoculture of leafcutter ant gardens.

    Directory of Open Access Journals (Sweden)

    Ulrich G Mueller

    2010-09-01

    Full Text Available Leafcutter ants depend on the cultivation of symbiotic Attamyces fungi for food, which are thought to be grown by the ants in single-strain, clonal monoculture throughout the hundreds to thousands of gardens within a leafcutter nest. Monoculture eliminates cultivar-cultivar competition that would select for competitive fungal traits that are detrimental to the ants, whereas polyculture of several fungi could increase nutritional diversity and disease resistance of genetically variable gardens.Using three experimental approaches, we assessed cultivar diversity within nests of Atta leafcutter ants, which are most likely among all fungus-growing ants to cultivate distinct cultivar genotypes per nest because of the nests' enormous sizes (up to 5000 gardens and extended lifespans (10-20 years. In Atta texana and in A. cephalotes, we resampled nests over a 5-year period to test for persistence of resident cultivar genotypes within each nest, and we tested for genetic differences between fungi from different nest sectors accessed through excavation. In A. texana, we also determined the number of Attamyces cells carried as a starter inoculum by a dispersing queens (minimally several thousand Attamyces cells, and we tested for genetic differences between Attamyces carried by sister queens dispersing from the same nest. Except for mutational variation arising during clonal Attamyces propagation, DNA fingerprinting revealed no evidence for fungal polyculture and no genotype turnover during the 5-year surveys.Atta leafcutter ants can achieve stable, fungal monoculture over many years. Mutational variation emerging within an Attamyces monoculture could provide genetic diversity for symbiont choice (gardening biases of the ants favoring specific mutational variants, an analog of artificial selection.

  11. Pest repelling properties of ant pheromones

    DEFF Research Database (Denmark)

    Offenberg, Joachim

    2014-01-01

    Ants control pests via predation and physical deterrence; however, ant communication is based on chemical cues which may serve as warning signals to potential prey and other intruders. The presence of ant pheromones may, thus, be sufficient to repel pests from ant territories. This mini-review sh......-review shows that four out of five tested ant species deposit pheromones that repel herbivorous prey from their host plants.......Ants control pests via predation and physical deterrence; however, ant communication is based on chemical cues which may serve as warning signals to potential prey and other intruders. The presence of ant pheromones may, thus, be sufficient to repel pests from ant territories. This mini...

  12. How ants drop out: ant abundance on tropical mountains.

    Science.gov (United States)

    Longino, John T; Branstetter, Michael G; Colwell, Robert K

    2014-01-01

    In tropical wet forests, ants are a large proportion of the animal biomass, but the factors determining abundance are not well understood. We characterized ant abundance in the litter layer of 41 mature wet forest sites spread throughout Central America (Chiapas, Guatemala, Honduras, Nicaragua, and Costa Rica) and examined the impact of elevation (as a proxy for temperature) and community species richness. Sites were intentionally chosen to minimize variation in precipitation and seasonality. From sea level to 1500 m ant abundance very gradually declined, community richness declined more rapidly than abundance, and the local frequency of the locally most common species increased. These results suggest that within this elevational zone, density compensation is acting, maintaining high ant abundance as richness declines. In contrast, in sites above 1500 m, ant abundance dropped abruptly to much lower levels. Among these high montane sites, community richness explained much more of the variation in abundance than elevation, and there was no evidence of density compensation. The relative stability of abundance below 1500 m may be caused by opposing effects of temperature on productivity and metabolism. Lower temperatures may decrease productivity and thus the amount of food available for consumers, but slower metabolisms of consumers may allow maintenance of higher biomass at lower resource supply rates. Ant communities at these lower elevations may be highly interactive, the result of continuous habitat presence over geological time. High montane sites may be ephemeral in geological time, resulting in non-interactive communities dominated by historical and stochastic processes. Abundance in these sites may be determined by the number of species that manage to colonize and/or avoid extinction on mountaintops.

  13. How ants drop out: ant abundance on tropical mountains.

    Directory of Open Access Journals (Sweden)

    John T Longino

    Full Text Available In tropical wet forests, ants are a large proportion of the animal biomass, but the factors determining abundance are not well understood. We characterized ant abundance in the litter layer of 41 mature wet forest sites spread throughout Central America (Chiapas, Guatemala, Honduras, Nicaragua, and Costa Rica and examined the impact of elevation (as a proxy for temperature and community species richness. Sites were intentionally chosen to minimize variation in precipitation and seasonality. From sea level to 1500 m ant abundance very gradually declined, community richness declined more rapidly than abundance, and the local frequency of the locally most common species increased. These results suggest that within this elevational zone, density compensation is acting, maintaining high ant abundance as richness declines. In contrast, in sites above 1500 m, ant abundance dropped abruptly to much lower levels. Among these high montane sites, community richness explained much more of the variation in abundance than elevation, and there was no evidence of density compensation. The relative stability of abundance below 1500 m may be caused by opposing effects of temperature on productivity and metabolism. Lower temperatures may decrease productivity and thus the amount of food available for consumers, but slower metabolisms of consumers may allow maintenance of higher biomass at lower resource supply rates. Ant communities at these lower elevations may be highly interactive, the result of continuous habitat presence over geological time. High montane sites may be ephemeral in geological time, resulting in non-interactive communities dominated by historical and stochastic processes. Abundance in these sites may be determined by the number of species that manage to colonize and/or avoid extinction on mountaintops.

  14. CONTROL Y VIGILANCIA EN FRONTERAS. PAPEL DE SANIDAD EXTERIOR DURANTE LAS FASES DE CONTENCIÓN DE LA PANDEMIA (H1 N1 2009

    Directory of Open Access Journals (Sweden)

    Miguel Dávila Cornejo

    2010-01-01

    Full Text Available Los controles sanitarios en fronteras, establecidos con el objetivo de retrasar la entrada del virus pandémico en España, constituyen una de las actividades propias de las fases de contención de la enfermedad. Su puesta en práctica como estrategia de salud pública en respuesta a epidemias es responsabilidad de la Dirección General de Salud Pública y Sanidad Exterior del Ministerio de Sanidad y Política Social, a través de la Subdirección General de Sanidad Exterior, y para ello se requiere una actuación coordinada con otros organismos implicados. Este trabajo tiene como finalidad describir las actuaciones realizadas en los aeropuertos internacionales durante dichas fases, así como evaluar su efectividad en la consecución del objetivo para el que fueron diseñadas. En este sentido, se establece una hipótesis que trata de explicar cómo las medidas adoptadas por Sanidad Exterior y la colaboración con los Servicios de Vigilancia Epidemiológica de las Comunidades Autónomas podrían haber contribuido a retrasar la propagación del virus en nuestro país. Se destaca la necesidad de consolidar los sistemas de vigilancia en fronteras potenciando dicha colaboración, así como la importancia de diseñar una estrategia clara de comunicación a la población en estos escenarios, que debe acompañar a la implementación de las demás medidas para evitar situaciones de incertidumbre.

  15. Aspectos genéticos del procesamiento de antígenos intracelulares

    Directory of Open Access Journals (Sweden)

    Beatriz Martínez

    1993-03-01

    Full Text Available La activación de los linfocitos T (LT, un aspecto fundamental en la generación de la respuesta inmune (RI, se produce mediante el contacto de sus receptores antigénicos (TCR con un complejo formado por un péptido derivado del antígeno y una molécula del complejo mayor de Histocompatibilidad (MHC, HLA en el humano sobre la superficie de una célula presentadora de antígenos (APC. El origen del péptido puede ser exógenooextracelular, como sucede con la mayoría de los antígenos presentados por las moléculas MHC clase II, o endógeno (intracelular, como es el caso de las proteínas virales. sintetizadas por la célula y presentadas por las moléculas MHC Clase.

  16. El docente ante el oficio de investigar en el aula

    Directory of Open Access Journals (Sweden)

    José Ignacio Bolaños Motta

    2016-10-01

    Full Text Available El presente escrito está inspirado en la canción titulada La fábula de los tres hermanos, del cantautor cubano Silvio Rodríguez Domínguez. Se espera que a través de estos tres apartes de la letra de esta canción, consecuentemente seleccionados, se genere una reflexión en torno a la actividad de generar proyectos de investigación en la escuela secundaria, o como se suele denominar actualmente investigación en el aula, al respecto se abordan las complicaciones, tópicos y demás problemáticas que eventualmente se pueden presentar en la multiplicidad de compromisos cotidianos ante los cuales se ve enfrentado el docente, al momento de desarrollar un proyecto de investigación en una comunidad educativa desde la metodología de la etnografía, hoy usada en los modelos de investigación en educación y pedagogía. Este documento tiene por objetivo generar una reflexión en torno a la mirada del maestro de escuela secundaria, ante el acto de investigar su contexto escolar de trabajo, y el papel de las universidades, en lo que concierne a la formación de licenciados con competencias en investigación educativa.

  17. Male parentage in army ants

    DEFF Research Database (Denmark)

    Kronauer, Daniel J C; Schöning, Caspar; Boomsma, Jacobus J

    2006-01-01

    of active research in insect sociobiology. Here we present microsatellite data for 176 males from eight colonies of the African army ant Dorylus (Anomma) molestus. Comparison with worker genotypes and inferred queen genotypes from the same colonies show that workers do not or at best very rarely reproduce...

  18. Opinião de acompanhantes de crianças em quimioterapia ambulatorial sobre uma quimioteca no Município de São Paulo Opinión de acompañantes de niños sometidos a quimioterapia en ambulatorio sobre una quimioteca en el municipio de Sao Paulo Opinion of adults escorting children on an outpatient chemotherapy service about a "Chemo-teca" in a municipality of Sao Paulo

    Directory of Open Access Journals (Sweden)

    Ione Queiroz de Jesus

    2010-04-01

    Full Text Available OBJETIVO: Conhecer a opinião dos acompanhantes de crianças de 2 a 12 anos de idade em tratamento quimioterápico sobre a Quimioteca Fundação Orsa. MÉTODOS: Trata-se de um estudo quantitativo descritivo. Realizaram-se entrevistas semi-estruturadas com 54 acompanhantes de crianças em tratamento quimioterápico ambulatorial. RESULTADOS: Na opinião desses acompanhantes, o ambiente colorido e cheio de brinquedos e a oferta de atividades lúdicas, durante a administração de quimioterápicos, têm influência positiva na qualidade do tratamento e no estado de bem-estar da criança. Apesar da avaliação extremamente positiva sobre o serviço, foram apontados aspectos que necessitam ser aprimorados, principalmente em relação ao atendimento. CONCLUSÃO: Os acompanhantes percebiam que o ambiente e o brincar colaboravam no bem estar das crianças em tratamento. A Quimioteca é uma experiência inovadora que pode servir de exemplo para o desenvolvimento de tecnologias criativas de cuidado às crianças com câncer e suas famílias, contribuindo para a melhoria da assistência a essa clientela.OBJETIVO: Conocer la opinión, de los acompañantes de niños de 2 a 12 años de edad sometidos a tratamiento de quimioterapia, sobre la Quimioteca Fundación Orsa. MÉTODOS: Se trata de un estudio cuantitativo descriptivo. Se realizaron entrevistas semi-estructuradas con 54 acompañantes de niños en tratamiento de quimioterapia en ambulatorio. RESULTADOS: En la opinión de esos acompañantes, el ambiente colorido lleno de juguetes y la oferta de actividades lúdicas, durante la administración de la quimioterapia, tiene influencia positiva en la calidad del tratamiento y en el estado de bienestar del niño. A pesar de la evaluación muy positiva sobre el servicio, fueron apuntados aspectos que necesitan ser mejorados, principalmente en relación a la atención. CONCLUSIÓN: Los acompañantes percibían que el ambiente y el jugar colaboraban en el bienestar

  19. A cellular automata model for ant trails

    Indian Academy of Sciences (India)

    In this study, the unidirectional ant traffic flow with U-turn in an ant trail was investigated using one-dimensional cellular automata model. It is known that ants communicate with each other by dropping a chemical, called pheromone, on the substrate. Apart from the studies in the literature, it was considered in the model that ...

  20. Fungal Adaptations to Mutualistic Life with Ants

    DEFF Research Database (Denmark)

    Kooij, Pepijn Wilhelmus

    Fungus-growing ants (Attini) feed off a fungus they cultivate in a mutualistic symbiosis in underground chambers by providing it substrate they collect outside the colony. The tribe of Attine ants ranges from small colonies of the paleo- and basal Attine species with a few hundred workers that fo...... that the fungus evolved some incredible adaptations to a mutualistic life with the ants....

  1. Editorial. Una Sabiduría Humanista

    Directory of Open Access Journals (Sweden)

    Angel Rodrigo Velez Bedoya

    2010-12-01

    Full Text Available La construcción de una sociedad justa, equitativa, solidaria y, ante todo, humana, sigue siendo una tarea de nunca acabar; parece ser que la racionalización moderna, la instrumentalización científica y tecnológica, la pérdida del sujeto, el impersonalismo y la masificación de las organizaciones, así como la pérdida paulatina del mundo de la vida, emergen cada vez mayor fuerza como problemas de difícil solución.

  2. Estilos de afrontamiento ante eventos estresantes en la infancia

    OpenAIRE

    Hernández Altamirano,Sheila Viridiana; Gutiérrez Lara,Mariana

    2012-01-01

    El afrontamiento es una variable mediadora de la adaptación y de los eventos estresantes de la vida diaria de un individuo. En el caso del infante le permite lidiar con los cambios físicos, psicológicos, familiares, sociales y académicos típicos de su edad. El objetivo de esta investigación fue identificar los estilos de afrontamiento utilizados por niños de 10 a 13 años de edad ante eventos estresantes. Para ello se realizó un estudio descriptivo en el cual los estilos de afrontamiento fuero...

  3. Microsatellite Primers for Fungus-Growing Ants

    DEFF Research Database (Denmark)

    Villesen Fredsted, Palle; Gertsch, Pia J.; Boomsma, Jacobus Jan (Koos)

    2002-01-01

    We isolated five polymorphic microsatellite loci from a library of two thousand recombinant clones of two fungus-growing ant species, Cyphomyrmex longiscapus and Trachymyrmex cf. zeteki. Amplification and heterozygosity were tested in five species of higher attine ants using both the newly...... developed primers and earlier published primers that were developed for fungus-growing ants. A total of 20 variable microsatellite loci, developed for six different species of fungus-growing ants, are now available for studying the population genetics and colony kin-structure of these ants....

  4. Microsatellite primers for fungus-growing ants

    DEFF Research Database (Denmark)

    Villesen, Palle; Gertsch, P J; Boomsma, JJ

    2002-01-01

    We isolated five polymorphic microsatellite loci from a library of two thousand recombinant clones of two fungus-growing ant species, Cyphomyrmex longiscapus and Trachymyrmex cf. zeteki. Amplification and heterozygosity were tested in five species of higher attine ants using both the newly...... developed primers and earlier published primers that were developed for fungus-growing ants. A total of 20 variable microsatellite loci, developed for six different species of fungus-growing ants, are now available for studying the population genetics and colony kin-structure of these ants....

  5. La Tuberculosis, Una Enfermedad Modificada*

    Directory of Open Access Journals (Sweden)

    Valentin Malagón Castro

    1993-12-01

    Full Text Available

    Con ocasión de un estudio de revisión que hemos llevado a cabo recientemente sobre la tuberculosis osteoarticular, *** se ha apreciado un cambio notable en las características y manifestaciones de esta enfermedad.

    Hemos sido testigos del comportamiento de la tuberculosis en los últimos 40 años. Realizamos la tesis profesional en el Hospital de niños de la Misericordia de Bogotá en el año 1950 (86, basada en el análisis de más de 300 enfermos de Mal de Pott tratados con pobres resultados en esa institución en la época prequimioterápica. Efectuamos estudios de control del tratamiento quirúrgico de esa afección en el Hospital Infantil Lorencita Villegas de Santos y publicamos sus resultados en los años 1975,1980 Y1987 (85-87-88. Los pacientes correspondientes a estas nuevas series, ya en la época de la quimioterapia moderna, presentaban un mejor pronóstico vital y funcional. Cuadro 1A.

    En el decenio 1978-1988 asistimos al descenso espectacular de la frecuencia de tuberculosis osteoarticular en las salas de nuestros hospitales. Posteriormente hemos sido igualmente testigos de su lenta y progresiva reaparición.

    El estudio actual nos ha mostrado profundos cambios, como ya se ha dicho, en el comportamiento de la entidad, por lo que estamos de acuerdo en denominarla: La tuberculosis, una enfermedad modificada, diferente a la que hasta hace un década parecía derrotada, vencida por las nuevas drogas y las recientes técnicas quirúrgicas.

    La actual es una enfermedad diferente que ha tomado una fuerza avasalladora que amenaza con volverse resistente al tratamiento específico y dar lugar a una pandemia de incalculables proporciones y de terribles consecuencias para la humanidad.

    El objeto de publicar este estudio es recordar a nuestros colegas, en especial a aquellos de las nuevas promociones que quizás no han tenido la oportunidad de estar en contacto con pacientes de tuberculosis osteoarticular, de

  6. Diferencias entre las ondas gripales de verano y de otoño durante la pandemia de gripe (H1N1 2009 en Navarra

    Directory of Open Access Journals (Sweden)

    Jesús Castilla

    2011-01-01

    Full Text Available Fundamento: La gripe (H1N1 2009 produjo en Navarra una onda en verano y otra en otoño de 2009. El objetivo de este trabajo es comparar las características de ambas ondas epidémicas. Métodos: Analizamos la notificación individualizada de gripe, las confirmaciones virológicas en la red centinela de atención primaria, y los casos hospitalizados con confirmación de gripe en Navarra y comparamos los periodos de verano (semanas 21 a 39 de 2009 y otoño-invierno (semanas 40 de 2009 a 20 de 2010. Resultados: Durante 2009 hubo dos ondas de gripe A(H1N12009, con picos en julio y noviembre. En verano (semana 21 a 39 se notificaron 4.389 casos de síndrome gripal, siendo los más afectados los adultos jóvenes (58! entre 15 y 44 años. La mayor incidencia se registró tras las fiestas de San Fermín (92 casos por 100.000 en la semana 29 con retorno inmediato a niveles basales. En otoño se produjo una segunda onda que alcanzó tasas 7 veces mayores (667 casos por 100.000 en la semana 45 y se mantuvieron 9 semanas por encima del umbral epidémico, siendo el grupo de edad más afectado el de niños de 5 a 14 años (111 por 1000. En el pico de las dos ondas el porcentaje de frotis confirmados para gripe superó el 60!. Durante el verano se produjeron 66 ingresos con confirmación de gripe (H1N12009, y en otoño 158. La proporción de casos que requirieron ingresos en hospital fue mayor en verano (1,5! que en otoño (0,8!; p<0,0001. Conclusión: La circulación de la gripe fue mucho menor en verano. La aparición de casos graves se produjo tanto en momentos con alta como con baja incidencia de síndromes gripales.

  7. Revolutionizing Remote Exploration with ANTS

    Science.gov (United States)

    Clark, P. E.; Rilee, M. L.; Curtis, S.; Truszkowski, W.

    2002-05-01

    We are developing the Autonomous Nano-Technology Swarm (ANTS) architecture based on an insect colony analogue for the cost-effective, efficient, systematic survey of remote or inaccessible areas with multiple object targets, including planetary surface, marine, airborne, and space environments. The mission context is the exploration in the 2020s of the most compelling remaining targets in the solar system: main belt asteroids. Main belt asteroids harbor important clues to Solar System origins and evolution which are central to NASA's goals in Space Science. Asteroids are smaller than planets, but their number is far greater, and their combined surface area likely dwarfs the Earth's. An asteroid survey will dramatically increase our understanding of the local resources available for the Human Exploration and Development of Space. During the mission composition, shape, gravity, and orbit parameters could be returned to Earth for perhaps several thousand asteroids. A survey of this area will rival the great explorations that encircled this globe, opened up the New World, and laid the groundwork for the progress and challenges of the last centuries. The ANTS architecture for a main belt survey consists of a swarm of as many as a thousand or more highly specialized pico-spacecraft that form teams to survey as many as one hundred asteroids a month. Multi-level autonomy is critical for ANTS and the objective of the proposed study is to work through the implications and constraints this entails. ANTS couples biologically inspired autonomic control for basic functions to higher level artificial intelligence that together enable individual spacecraft to operate as specialized, cooperative, social agents. This revolutionary approach postulates highly advanced, but familiar, components integrated and operated in a way that uniquely transcends any evolutionary extrapolation of existing trends and enables thousand-spacecraft missions.

  8. Ant-plant mutualism: a dietary by-product of a tropical ant's macronutrient requirements.

    Science.gov (United States)

    Arcila Hernández, Lina M; Sanders, Jon G; Miller, Gabriel A; Ravenscraft, Alison; Frederickson, Megan E

    2017-12-01

    Many arboreal ants depend on myrmecophytic plants for both food and shelter; in return, these ants defend their host plants against herbivores, which are often insects. Ant-plant and other mutualisms do not necessarily involve the exchange of costly rewards or services; they may instead result from by-product benefits, or positive outcomes that do not entail a cost for one or both partners. Here, we examined whether the plant-ant Allomerus octoarticulatus pays a short-term cost to defend their host plants against herbivores, or whether plant defense is a by-product benefit of ant foraging for insect prey. Because the food offered by ant-plants is usually nitrogen-poor, arboreal ants may balance their diets by consuming insect prey or associating with microbial symbionts to acquire nitrogen, potentially shifting the costs and benefits of plant defense for the ant partner. To determine the effect of ant diet on an ant-plant mutualism, we compared the behavior, morphology, fitness, stable isotope signatures, and gaster microbiomes of A. octoarticulatus ants nesting in Cordia nodosa trees maintained for nearly a year with or without insect herbivores. At the end of the experiment, ants from herbivore exclosures preferred protein-rich baits more than ants in the control (i.e., herbivores present) treatment. Furthermore, workers in the control treatment were heavier than in the herbivore-exclusion treatment, and worker mass predicted reproductive output, suggesting that foraging for insect prey directly increased ant colony fitness. The gaster microbiome of ants was not significantly affected by the herbivore exclusion treatment. We conclude that the defensive behavior of some phytoecious ants is a by-product of their need for external protein sources; thus, the consumption of insect herbivores by ants benefits both the ant colony and the host plant. © 2017 by the Ecological Society of America.

  9. Ecosystem services delivered by weaver ants

    DEFF Research Database (Denmark)

    Offenberg, Joachim

    Weaver ants (Oecopgylla spp.) are increasingly being utilized as efficient biocontrol agents in a number of tropical tree crops, as they prey on pest insects and increase yields. However, recent studies and a review of the literature reveal that a number of other services may derive from the pres......Weaver ants (Oecopgylla spp.) are increasingly being utilized as efficient biocontrol agents in a number of tropical tree crops, as they prey on pest insects and increase yields. However, recent studies and a review of the literature reveal that a number of other services may derive from...... the presence of these ants. First of all, the chemical footprint left by the high density of ants in managed host trees may results in additional benefits. (i) Ant deposits may lead to improved fruit quality, e.g. increased sugar content, (ii) ant deposits may deter important pests (chemical deterrence) from...... crops, and lastly, (iii) ant waste products deposited ias anal spots contain urea that may be taken up by plant leaves and in this way fertilize ant-plants. On top of chemical services, weaver ants have been shown to reduce plant disease incidence via competitive exclusion of other ant species because...

  10. Roadside Survey of Ants on Oahu, Hawaii

    Science.gov (United States)

    Tong, Reina L.; Grace, J. Kenneth; Krushelnycky, Paul D.

    2018-01-01

    Hawaii is home to over 60 ant species, including five of the six most damaging invasive ants. Although there have been many surveys of ants in Hawaii, the last island-wide hand-collection survey of ants on Oahu was conducted in 1988–1994. In 2012, a timed hand-collection of ants was made at 44 sites in a systematic, roadside survey throughout Oahu. Ants were identified and species distribution in relation to elevation, precipitation and soil type was analyzed. To assess possible convenience sampling bias, 15 additional sites were sampled further from roads to compare with the samples near roads. Twenty-four species of ants were found and mapped; Pheidole megacephala (F.), Ochetellus glaber (Mayr), and Technomyrmex difficilis Forel were the most frequently encountered ants. For six ant species, a logistic regression was performed with elevation, average annual precipitation, and soil order as explanatory variables. O. glaber was found in areas with lower precipitation around Oahu. Paratrechina longicornis (Latrielle) and Tetramorium simillimum (Smith, F.) were found more often in lower elevations and in areas with the Mollisol soil order. Elevation, precipitation, and soil type were not significant sources of variation for P. megacephala, Plagiolepis alluaudi Emery, and T. difficilis. P. megacephala was associated with fewer mean numbers of ants where it occurred. Ant assemblages near and far from roads did not significantly differ. Many species of ants remain established on Oahu, and recent invaders are spreading throughout the island. Mapping ant distributions contributes to continued documentation and understanding of these pests. PMID:29439503

  11. una comunidad

    Directory of Open Access Journals (Sweden)

    Adriana Hernández García

    2006-01-01

    embargo, el desarrollo generó mayores desigualdades económicas entre las poblaciones urbanas y las rurales, así como efectos de contaminación del medio ambiente y escasez de los recursos naturales. En este trabajo se presentan los puntos de encuentros locales, la historia, identidad y simbolismos que mantienen una visión de la vida comunal; los desencuentros frente al desarrollo aplicado en la localidad; los cambios en los patrones de cultivo y de la pesca, así como la migración como uno de los principales efectos del cambio.

  12. Ant Larval Demand Reduces Aphid Colony Growth Rates in an Ant-Aphid Interaction

    Directory of Open Access Journals (Sweden)

    James M. Cook

    2012-02-01

    Full Text Available Ants often form mutualistic interactions with aphids, soliciting honeydew in return for protective services. Under certain circumstances, however, ants will prey upon aphids. In addition, in the presence of ants aphids may increase the quantity or quality of honeydew produced, which is costly. Through these mechanisms, ant attendance can reduce aphid colony growth rates. However, it is unknown whether demand from within the ant colony can affect the ant-aphid interaction. In a factorial experiment, we tested whether the presence of larvae in Lasius niger ant colonies affected the growth rate of Aphis fabae colonies. Other explanatory variables tested were the origin of ant colonies (two separate colonies were used and previous diet (sugar only or sugar and protein. We found that the presence of larvae in the ant colony significantly reduced the growth rate of aphid colonies. Previous diet and colony origin did not affect aphid colony growth rates. Our results suggest that ant colonies balance the flow of two separate resources from aphid colonies- renewable sugars or a protein-rich meal, depending on demand from ant larvae within the nest. Aphid payoffs from the ant-aphid interaction may change on a seasonal basis, as the demand from larvae within the ant colony waxes and wanes.

  13. Abordando la problemática del Dengue desde una perspectiva ambiental

    Directory of Open Access Journals (Sweden)

    Claudia Zuñiga Vega

    2009-01-01

    Full Text Available El Dengue es una enfermedad viral que genera danos cuantiosos en los países donde se desarrolla, afectando la economía, las actividades productivas y el turismo, entre otros. El principal transmisor de esta enfermedad es el mosquito Aedes aegypti y las campanas para erradicar este vector se han dirigido principalmente hacia la eliminación de sus larvas y adultos por medio de plaguicidas y hacia la reducción del mal manejo de los desechos. Sin embargo, no se ha realizado esfuerzos para determinar las razones por las que las poblaciones de este mosquito han sido tan exitosas, ni se ha aplicado enfoques integrales para luchar contra esta pandemia. Este artículo trata de explicar el incremento de los casos de Dengue desde la perspectiva del descontrol y desinterés ambiental y la falta de apoyo a las comunidades en muchos campos. Es por esto que los autores proponen abordar esta problemática desde una perspectiva ambiental integral, abarcando desde el control químico y biológico hasta la integración de todos los sectores involucrados (Gobierno, médicos y comunidad.

  14. The distribution and diversity of insular ants

    DEFF Research Database (Denmark)

    Roura-Pascual, Núria; Sanders, Nate; Hui, Cang

    2016-01-01

    Aim: To examine the relationship between island characteristics (area, distance to the nearest continent, climate and human population size) and ant species richness, as well as the factors underlying global geographical clustering of native and exotic ant composition on islands. Location: One...... hundred and two islands from 20 island groups around the world. Methods: We used spatial linear models that consider the spatial structure of islands to examine patterns of ant species richness. We also performed modularity analyses to identify clusters of islands hosting a similar suite of species...... and constructed conditional inference trees to assess the characteristics of islands that explain the formation of these island-ant groups. Results: Island area was the best predictor of ant species richness. However, distance to the nearest continent was an important predictor of native ant species richness...

  15. Ant-plant symbioses: Stalking the chuyachaqui.

    Science.gov (United States)

    Davidson, D W; McKey, D

    1993-09-01

    According to Quechua-speaking peoples, orchard-like stands ('Supay Chacras') of two Amazonian ant-plant species are cultivated by the devil, or 'Chuyachaqui'. These "devil gardens" offer extreme examples of specializations that have evolved repeatedly in ant-plant associations. Numerous investigations are beginning to disclose the identity of the Chuyachaqui - the forces behind evolutionary specialization in ant-plant symbioses. These developments have important implications for our understanding of modes of coevolution in symbiotic mutualism, remarkable convergent similarities in the form of ant-plant symbioses on different continents, and pronounced intercontinental differences in the diversity and taxonomic composition of associates. Copyright © 1993. Published by Elsevier Ltd.

  16. From Ant Trails to Pedestrian Dynamics

    Directory of Open Access Journals (Sweden)

    Andreas Schadschneider

    2003-01-01

    Full Text Available This paper presents a model for the simulation of pedestrian dynamics inspired by the behaviour of ants in ant trails. Ants communicate by producing a pheromone that can be smelled by other ants. In this model, pedestrians produce a virtual pheromone that influences the motion of others. In this way all interactions are strictly local, and so even large crowds can be simulated very efficiently. Nevertheless, the model is able to reproduce the collective effects observed empirically, eg the formation of lanes in counterflow. As an application, we reproduce a surprising result found in experiments of evacuation from an aircraft.

  17. Microorganisms transported by ants induce changes in floral nectar composition of an ant-pollinated plant.

    Science.gov (United States)

    de Vega, Clara; Herrera, Carlos M

    2013-04-01

    Interactions between plants and ants abound in nature and have significant consequences for ecosystem functioning. Recently, it has been suggested that nectar-foraging ants transport microorganisms to flowers; more specifically, they transport yeasts, which can potentially consume sugars and alter nectar composition. Therefore, ants could indirectly change nectar sugar profile, an important floral feature involved in the plant-pollinator mutualism. But this novel role for ants has never been tested. We here investigate the effects of nectarivorous ants and their associated yeasts on the floral nectar sugar composition of an ant-pollinated plant. Differences in the nectar sugar composition of ant-excluded and ant-visited flowers were examined in 278 samples by using high-performance liquid-chromatography. The importance of the genetic identity and density of ant-transported basidiomycetous and ascomycetous yeasts on the variation of nectar traits was also evaluated. Ant visitation had significant effects on nectar sugar composition. The nectar of ant-visited flowers contained significantly more fructose, more glucose, and less sucrose than the nectar of ant-excluded flowers, but these effects were context dependent. Nectar changes were correlated with the density of yeast cells in nectar. The magnitude of the effects of ant-transported ascomycetes was much higher than that of basiodiomycetes. Ants and their associated yeasts induce changes in nectar sugar traits, reducing the chemical control of the plant over this important floral trait. The potential relevance of this new role for ants as indirect nectar modifiers is a rich topic for future research into the ecology of ant-flower interactions.

  18. Pollination and facultative ant-association in the African leopard ...

    African Journals Online (AJOL)

    The role of extra-floral nectar appears to be recruitment of foraging ants to tend the flowers resulting in a facultative ant-association between the orchid and gregarious ants. Four different ant species were found to forage on A. africana's inflorescences. Ant-tended inflorescences suffered significantly less damage by insects.

  19. Michael Jackson antes del caos

    OpenAIRE

    Juan Luciano Nieves

    2015-01-01

    Michael Jackson es un buen ejemplo de cómo utilizar las relaciones públicas para realizar o manipular la imagen de un producto a través de los medios de comunicación. Este ensayo pretende analizar los eventos que tuvieron lugar antes de que el cantante fuera acusado de abuso sexual contra un menor. Dichos eventos formaron parte de un plan muy bien delineado para disminuir los efectos de la inminente crisis que se acercaba. Este trabajo combina la crítica retórica de temas de fantasía con teor...

  20. Viaje Antártico

    OpenAIRE

    Lasa, Gorka

    2017-01-01

    Ah, qué grandiosa sensación esta de poder caminar por los eternos hielos y dejar que mi vista se pierda en el horizonte crepuscular de esta desolada región! Aquellas solitarias islas, lamentos blancos en la distancia, aquellos azules glaciares llorando su neblina de frío y siglos. Al llamado lejano, mi alma se ve arrastrada por los vientos australes. Mítico ensueño que genera en mi imaginación el gran continente antártico. Belleza misteriosa e intimidante de la vastedad casi mágica que envuel...

  1. EFICACIA DE UNA INTERVENCIÓN PARA DISMINUIR LA ANSIEDAD FRENTE A LOS EXÁMENES EN ESTUDIANTES UNIVERSITARIOS ARGENTINOS/ EFFICACY OF AN INTERVENTION AIMED AT REDUCING TEST ANXIETY IN ARGENTINEAN UNIVERSITY STUDENTS/ EFICÁCIA DE UMA INTERVENÇÃO PARA DIMINUIR A ANSIEDADE ANTE OS EXAMES EM ESTUDANTES UNIVERSITÁRIOS ARGENTINOS

    Directory of Open Access Journals (Sweden)

    Luis Alberto Furlan

    2013-06-01

    Full Text Available Se evaluó la efectividad de un programa para disminuir la ansiedad ante los exámenes, la procrastinación académica e incrementar la autoeficacia regulatoria, con 19 estudiantes universitarios de Argentina. El programa estimula el automonitoreo de las estrategias de aprendizaje implementadas, el aprendizaje de técnicas cognitivo-conductuales de control de la ansiedad y el ensayo anticipado de exámenes. Al comparar los resultados pre- y posintervención, se constataron mejorías moderadas. Se deben revisar los procedimientos para incrementar la adherencia al programa y la validez de los resultados.

  2. Foliar uptake of nitrogen from ant fecal droplets: an overlooked service to ant plants

    DEFF Research Database (Denmark)

    Pinkalski, Christian Alexander Stidsen; Jensen, Karl-Martin Vagn; Damgaard, Christian Frølund

    2018-01-01

    and subsequently deposited fecal droplets on the seedlings, coffee leaves showed increased levels of 15N and total N compared to control plants without ants. This was evident for both exposed leaves and leaves covered in plastic bags (i.e. not directly exposed to ants). Thus, N from ant excretions was absorbed...

  3. The evolution of genome size in ants

    Directory of Open Access Journals (Sweden)

    Spagna Joseph C

    2008-02-01

    Full Text Available Abstract Background Despite the economic and ecological importance of ants, genomic tools for this family (Formicidae remain woefully scarce. Knowledge of genome size, for example, is a useful and necessary prerequisite for the development of many genomic resources, yet it has been reported for only one ant species (Solenopsis invicta, and the two published estimates for this species differ by 146.7 Mb (0.15 pg. Results Here, we report the genome size for 40 species of ants distributed across 10 of the 20 currently recognized subfamilies, thus making Formicidae the 4th most surveyed insect family and elevating the Hymenoptera to the 5th most surveyed insect order. Our analysis spans much of the ant phylogeny, from the less derived Amblyoponinae and Ponerinae to the more derived Myrmicinae, Formicinae and Dolichoderinae. We include a number of interesting and important taxa, including the invasive Argentine ant (Linepithema humile, Neotropical army ants (genera Eciton and Labidus, trapjaw ants (Odontomachus, fungus-growing ants (Apterostigma, Atta and Sericomyrmex, harvester ants (Messor, Pheidole and Pogonomyrmex, carpenter ants (Camponotus, a fire ant (Solenopsis, and a bulldog ant (Myrmecia. Our results show that ants possess small genomes relative to most other insects, yet genome size varies three-fold across this insect family. Moreover, our data suggest that two whole-genome duplications may have occurred in the ancestors of the modern Ectatomma and Apterostigma. Although some previous studies of other taxa have revealed a relationship between genome size and body size, our phylogenetically-controlled analysis of this correlation did not reveal a significant relationship. Conclusion This is the first analysis of genome size in ants (Formicidae and the first across multiple species of social insects. We show that genome size is a variable trait that can evolve gradually over long time spans, as well as rapidly, through processes that may

  4. Hybrid chaotic ant swarm optimization

    International Nuclear Information System (INIS)

    Li Yuying; Wen Qiaoyan; Li Lixiang; Peng Haipeng

    2009-01-01

    Chaotic ant swarm optimization (CASO) is a powerful chaos search algorithm that is used to find the global optimum solution in search space. However, the CASO algorithm has some disadvantages, such as lower solution precision and longer computational time, when solving complex optimization problems. To resolve these problems, an improved CASO, called hybrid chaotic swarm optimization (HCASO), is proposed in this paper. The new algorithm introduces preselection operator and discrete recombination operator into the CASO; meanwhile it replaces the best position found by own and its neighbors' ants with the best position found by preselection operator and discrete recombination operator in evolution equation. Through testing five benchmark functions with large dimensionality, the experimental results show the new method enhances the solution accuracy and stability greatly, as well as reduces the computational time and computer memory significantly when compared to the CASO. In addition, we observe the results can become better with swarm size increasing from the sensitivity study to swarm size. And we gain some relations between problem dimensions and swam size according to scalability study.

  5. A gripe de longe e de perto: comparações entre as pandemias de 1918 e 2009 The flu far and near: comparing the 1918 and 2009 pandemics

    Directory of Open Access Journals (Sweden)

    Adriana Alvarez

    2009-12-01

    Full Text Available Neste debate, historiadores latino-americanos comparam a pandemia de gripe de 1918-1919 com a que varre o continente em 2009, sobretudo as experiências de México, Argentina e Brasil. Analisam as estratégias adotadas nos dois momentos, com ênfase em isolamento, vigilância em portos e aeroportos, intervenções nas cidades. Comparam a atuação dos Estados nacionais e governos locais, a posição dos médicos e dos meios de comunicação e o comportamento das populações, especialmente no tocante ao medo e à morte. Analisam o desempenho das estruturas de assistência às populações e as medidas terapêuticas e profiláticas recomendadas por órgãos públicos de saúde, por interesses privados ligados à venda de medicamentos e pelas medicinas populares e caseiras. O debate trata, ainda, da influência que a experiência de 1918 teve sobre as avaliações da crise atual, bem como do legado que deixará para o futuro.In this debate, Latin American historians compare the 1918-1919 flu pandemic with the one sweeping the continent in 2009, focusing especially on the experiences in Mexico, Argentina, and Brazil. They analyze the strategies adopted on both occasions, above all isolation measures, port and airport surveillance, and urban interventions. Comparisons are drawn between the actions of federal and local governments, positions taken by doctors and the media, and people's behavior, particularly regarding fear and death. The debaters also analyze the performance of assistance structures, the treatment and prevention measures recommended by public health agencies and private groups with a vested interest in drug sales, and popular and home remedies. The debate extends to how the 1918 experience has influenced the evaluation of today's crisis and what legacy it may leave behind.

  6. The Biochemical Toxin Arsenal from Ant Venoms

    Directory of Open Access Journals (Sweden)

    Axel Touchard

    2016-01-01

    Full Text Available Ants (Formicidae represent a taxonomically diverse group of hymenopterans with over 13,000 extant species, the majority of which inject or spray secretions from a venom gland. The evolutionary success of ants is mostly due to their unique eusociality that has permitted them to develop complex collaborative strategies, partly involving their venom secretions, to defend their nest against predators, microbial pathogens, ant competitors, and to hunt prey. Activities of ant venom include paralytic, cytolytic, haemolytic, allergenic, pro-inflammatory, insecticidal, antimicrobial, and pain-producing pharmacologic activities, while non-toxic functions include roles in chemical communication involving trail and sex pheromones, deterrents, and aggregators. While these diverse activities in ant venoms have until now been largely understudied due to the small venom yield from ants, modern analytical and venomic techniques are beginning to reveal the diversity of toxin structure and function. As such, ant venoms are distinct from other venomous animals, not only rich in linear, dimeric and disulfide-bonded peptides and bioactive proteins, but also other volatile and non-volatile compounds such as alkaloids and hydrocarbons. The present review details the unique structures and pharmacologies of known ant venom proteinaceous and alkaloidal toxins and their potential as a source of novel bioinsecticides and therapeutic agents.

  7. The Biochemical Toxin Arsenal from Ant Venoms

    Science.gov (United States)

    Touchard, Axel; Aili, Samira R.; Fox, Eduardo Gonçalves Paterson; Escoubas, Pierre; Orivel, Jérôme; Nicholson, Graham M.; Dejean, Alain

    2016-01-01

    Ants (Formicidae) represent a taxonomically diverse group of hymenopterans with over 13,000 extant species, the majority of which inject or spray secretions from a venom gland. The evolutionary success of ants is mostly due to their unique eusociality that has permitted them to develop complex collaborative strategies, partly involving their venom secretions, to defend their nest against predators, microbial pathogens, ant competitors, and to hunt prey. Activities of ant venom include paralytic, cytolytic, haemolytic, allergenic, pro-inflammatory, insecticidal, antimicrobial, and pain-producing pharmacologic activities, while non-toxic functions include roles in chemical communication involving trail and sex pheromones, deterrents, and aggregators. While these diverse activities in ant venoms have until now been largely understudied due to the small venom yield from ants, modern analytical and venomic techniques are beginning to reveal the diversity of toxin structure and function. As such, ant venoms are distinct from other venomous animals, not only rich in linear, dimeric and disulfide-bonded peptides and bioactive proteins, but also other volatile and non-volatile compounds such as alkaloids and hydrocarbons. The present review details the unique structures and pharmacologies of known ant venom proteinaceous and alkaloidal toxins and their potential as a source of novel bioinsecticides and therapeutic agents. PMID:26805882

  8. Ant aggression and evolutionary stability in plant-ant and plant-pollinator mutualistic interactions.

    Science.gov (United States)

    Oña, L; Lachmann, M

    2011-03-01

    Mutualistic partners derive a benefit from their interaction, but this benefit can come at a cost. This is the case for plant-ant and plant-pollinator mutualistic associations. In exchange for protection from herbivores provided by the resident ants, plants supply various kinds of resources or nests to the ants. Most ant-myrmecophyte mutualisms are horizontally transmitted, and therefore, partners share an interest in growth but not in reproduction. This lack of alignment in fitness interests between plants and ants drives a conflict between them: ants can attack pollinators that cross-fertilize the host plants. Using a mathematical model, we define a threshold in ant aggressiveness determining pollinator survival or elimination on the host plant. In our model we observed that, all else being equal, facultative interactions result in pollinator extinction for lower levels of ant aggressiveness than obligatory interactions. We propose that the capacity to discriminate pollinators from herbivores should not often evolve in ants, and when it does it will be when the plants exhibit limited dispersal in an environment that is not seed saturated so that each seed produced can effectively generate a new offspring or if ants acquire an extra benefit from pollination (e.g. if ants eat fruit). We suggest specific mutualism examples where these hypotheses can be tested empirically. © 2010 The Authors. Journal of Evolutionary Biology © 2010 European Society For Evolutionary Biology.

  9. Efímero Festín, el video danza antártico

    OpenAIRE

    Pombo, Ernesto; Costa Chimene

    2013-01-01

    Efímero Festín es un video danza pensado específicamente para ser realizado en la Antártida argentina. Pretende a través del arte y de una forma poética, colaborar con la concientización del cuidado del medio ambiente.

  10. AntStar: Enhancing Optimization Problems by Integrating an Ant System and A⁎ Algorithm

    Directory of Open Access Journals (Sweden)

    Mohammed Faisal

    2016-01-01

    Full Text Available Recently, nature-inspired techniques have become valuable to many intelligent systems in different fields of technology and science. Among these techniques, Ant Systems (AS have become a valuable technique for intelligent systems in different fields. AS is a computational system inspired by the foraging behavior of ants and intended to solve practical optimization problems. In this paper, we introduce the AntStar algorithm, which is swarm intelligence based. AntStar enhances the optimization and performance of an AS by integrating the AS and A⁎ algorithm. Applying the AntStar algorithm to the single-source shortest-path problem has been done to ensure the efficiency of the proposed AntStar algorithm. The experimental result of the proposed algorithm illustrated the robustness and accuracy of the AntStar algorithm.

  11. Cryptococcus neoformans carried by Odontomachus bauri ants

    Directory of Open Access Journals (Sweden)

    Mariana Santos de Jesus

    2012-06-01

    Full Text Available Cryptococcus neoformans is the most common causative agent of cryptococcosis worldwide. Although this fungus has been isolated from a variety of organic substrates, several studies suggest that hollow trees constitute an important natural niche for C. neoformans. A previously surveyed hollow of a living pink shower tree (Cassia grandis positive for C. neoformans in the city of Rio de Janeiro, Brazil, was chosen for further investigation. Odontomachus bauri ants (trap-jaw ants found inside the hollow were collected for evaluation as possible carriers of Cryptococcus spp. Two out of 10 ants were found to carry phenoloxidase-positive colonies identified as C. neoformans molecular types VNI and VNII. The ants may have acted as a mechanical vector of C. neoformans and possibly contributed to the dispersal of the fungi from one substrate to another. To the best of our knowledge, this is the first report on the association of C. neoformans with ants of the genus Odontomachus.

  12. Recurrence analysis of ant activity patterns.

    Directory of Open Access Journals (Sweden)

    Felipe Marcel Neves

    Full Text Available In this study, we used recurrence quantification analysis (RQA and recurrence plots (RPs to compare the movement activity of individual workers of three ant species, as well as a gregarious beetle species. RQA and RPs quantify the number and duration of recurrences of a dynamical system, including a detailed quantification of signals that could be stochastic, deterministic, or both. First, we found substantial differences between the activity dynamics of beetles and ants, with the results suggesting that the beetles have quasi-periodic dynamics and the ants do not. Second, workers from different ant species varied with respect to their dynamics, presenting degrees of predictability as well as stochastic signals. Finally, differences were found among minor and major caste of the same (dimorphic ant species. Our results underscore the potential of RQA and RPs in the analysis of complex behavioral patterns, as well as in general inferences on animal behavior and other biological phenomena.

  13. Ants defend aphids against lethal disease

    Science.gov (United States)

    Nielsen, Charlotte; Agrawal, Anurag A.; Hajek, Ann E.

    2010-01-01

    Social insects defend their own colonies and some species also protect their mutualist partners. In mutualisms with aphids, ants typically feed on honeydew produced by aphids and, in turn guard and shelter aphid colonies from insect natural enemies. Here we report that Formica podzolica ants tending milkweed aphids, Aphis asclepiadis, protect aphid colonies from lethal fungal infections caused by an obligate aphid pathogen, Pandora neoaphidis. In field experiments, bodies of fungal-killed aphids were quickly removed from ant-tended aphid colonies. Ant workers were also able to detect infective conidia on the cuticle of living aphids and responded by either removing or grooming these aphids. Our results extend the long-standing view of ants as mutualists and protectors of aphids by demonstrating focused sanitizing and quarantining behaviour that may lead to reduced disease transmission in aphid colonies. PMID:19923138

  14. CARACTERIZACIÓN DE LUMINARIAS TIPO HALURO METÁLICO ANTE EVENTOS SAG

    Directory of Open Access Journals (Sweden)

    Bonie Johana Restrepo Cuestas

    Full Text Available Este artículo plantea una metodología para la caracterización de luminarias de haluro metálico, ante eventos sag. Inicialmente, se diseñó y construyó un generador de eventos sag. Luego, se planteó un esquema de pruebas, que fue utilizado para analizar el comportamiento de un tipo de luminarias de alta densidad de descarga tipo Metal Halide, ante eventos sag. Finalmente, tomando como referente el estándar SEMI F-47, se realizó la construcción de una curva característica que muestra la región de operación de la luminaria.

  15. Persistence of pollination mutualisms in the presence of ants.

    Science.gov (United States)

    Wang, Yuanshi; Wang, Shikun

    2015-01-01

    This paper considers plant-pollinator-ant systems in which the plant-pollinator interaction is mutualistic but ants have both positive and negative effects on plants. The ants also interfere with pollinators by preventing them from accessing plants. While a Beddington-DeAngelis (BD) formula can describe the plant-pollinator interaction, the formula is extended in this paper to characterize the pollination mutualism under the ant interference. Then, a plant-pollinator-ant system with the extended BD functional response is discussed, and global dynamics of the model demonstrate the mechanisms by which pollination mutualism can persist in the presence of ants. When the ant interference is strong, it can result in extinction of pollinators. Moreover, if the ants depend on pollination mutualism for survival, the strong interference could drive pollinators into extinction, which consequently lead to extinction of the ants themselves. When the ant interference is weak, a cooperation between plant-ant and plant-pollinator mutualisms could occur, which promotes survival of both ants and pollinators, especially in the case that ants (respectively, pollinators) cannot survive in the absence of pollinators (respectively, ants). Even when the level of ant interference remains invariant, varying ants' negative effect on plants can result in survival/extinction of both ants and pollinators. Therefore, our results provide an explanation for the persistence of pollination mutualism when there exist ants.

  16. COMPARECENCIA ANTE LA COMISIÓN DE EDUCACIÓN DEL PARLAMENTO DE ANDALUCÍA

    Directory of Open Access Journals (Sweden)

    Francisco Cuadrado Muñoz

    2009-11-01

    Es necesario un compromiso con la evaluación en todos los ámbitos del sistema educativo andaluz, porque nos permite valorar lo que hacemos y reorientar nuestro trabajo. En una sociedad moderna y democrática, no cabe la autocomplacencia, la acomodación o el ocultamiento, y es necesario rendir cuentas de lo que se hace y los resultados que se obtienen ante los poderes públicos.

  17. Brinquedo terapêutico no preparo da criança para punção venosa ambulatorial: percepção dos pais e acompanhantes El juego terapéutico en la preparación del niño para una punción venosa en ambulatorio: percepción de los padres y acompañantes Therapeutic play when preparing the child for venipuncture outpatient: perception from the parents and attendants

    Directory of Open Access Journals (Sweden)

    Caroline Monteiro Conceição

    2011-06-01

    Full Text Available Estudo descritivo qualitativo com o objetivo de compreender a percepção de pais e acompanhantes sobre o emprego do Brinquedo Terapêutico no preparo da criança para a punção venosa ambulatorial, realizado em um ambulatório da cidade de São Paulo. Os dados foram coletados por meio de entrevistas semiestruturadas realizadas com oito pais ou acompanhantes de crianças preparadas para a punção venosa com o Brinquedo Terapêutico e, após, submetidos à análise qualitativa de conteúdo. Os resultados evidenciaram que eles aprovam essa estratégia de preparo e acreditam que esta favorece o conhecimento sobre o procedimento, diminui o medo, acalma e promove a segurança deles e da criança, além de constituir-se em um atendimento de enfermagem humanizado e de qualidade à criança e família. Reitera-se a importância da implementação do Brinquedo Terapêutico na assistência à criança em ambulatórios e unidades básicas de saúde.Estudio descriptivo cualitativo realizado con el objetivo de comprender la percepción de los padres y acompañante a respecto de la utilización del Juego Terapéutico en la preparación de sus hijos para la punción venosa previa a la recolección de sangre. Fue realizado en un ambulatorio de la ciudad de São Paulo. Los datos fueron recolectados por medio de entrevistas seme-estructuradas realizadas con ocho padres o acompañantes de niños preparados con el juego para la recolección de sangre, y que, después, fueron sometidos al análisis cualitativo del contenido. Los resultados evidenciaron que los padres aprueban esa estrategia de preparación y consideran que la misma favorece al conocimiento sobre el procedimiento, disminuye el miedo, tranquiliza y promueve la seguridad de los adultos y de los niños, además de ser una atención de enfermería humanizada y de calidad al niño y a la familia. Se reitera la importancia de la implementación del Juego Terapéutico en la asistencia al niño en

  18. Michael Jackson antes del caos

    Directory of Open Access Journals (Sweden)

    Juan Luciano Nieves

    2015-01-01

    Full Text Available Michael Jackson es un buen ejemplo de cómo utilizar las relaciones públicas para realizar o manipular la imagen de un producto a través de los medios de comunicación. Este ensayo pretende analizar los eventos que tuvieron lugar antes de que el cantante fuera acusado de abuso sexual contra un menor. Dichos eventos formaron parte de un plan muy bien delineado para disminuir los efectos de la inminente crisis que se acercaba. Este trabajo combina la crítica retórica de temas de fantasía con teoría de comunicación.

  19. Individual Recognition in Ant Queens

    DEFF Research Database (Denmark)

    D'Ettorre, Patrizia; Heinze, Jürgen

    2005-01-01

    Personal relationships are the cornerstone of vertebrate societies, but insect societies are either too large for individual recognition, or their members were assumed to lack the necessary cognitive abilities 1 and 2 . This paradigm has been challenged by the recent discovery that paper wasps...... recognize each other's unique facial color patterns [3] . Individual recognition is advantageous when dominance hierarchies control the partitioning of work and reproduction 2 and 4 . Here, we show that unrelated founding queens of the ant Pachycondyla villosa use chemical cues to recognize each other...... individually. Aggression was significantly lower in pairs of queens that had previously interacted than in pairs with similar social history but no experience with one another. Moreover, subordinates discriminated familiar and unfamiliar dominants in choice experiments in which physical contact, but not odor...

  20. FDTD-ANT User Manual

    Science.gov (United States)

    Zimmerman, Martin L.

    1995-01-01

    This manual explains the theory and operation of the finite-difference time domain code FDTD-ANT developed by Analex Corporation at the NASA Lewis Research Center in Cleveland, Ohio. This code can be used for solving electromagnetic problems that are electrically small or medium (on the order of 1 to 50 cubic wavelengths). Calculated parameters include transmission line impedance, relative effective permittivity, antenna input impedance, and far-field patterns in both the time and frequency domains. The maximum problem size may be adjusted according to the computer used. This code has been run on the DEC VAX and 486 PC's and on workstations such as the Sun Sparc and the IBM RS/6000.

  1. Discurso de Benedicto XVI al cuerpo diplomático acreditado ante la Santa Sede

    Directory of Open Access Journals (Sweden)

    Antonio Alonso

    2008-01-01

    Full Text Available El autor glosa el Discurso que al comienzo de cada año dirige el Santo Padre a los miembros del cuerpo diplomático acreditado ante la Santa Sede. El Papa divide su intervención en dos partes: una, dedicada a ofrecer una panorámica de las situaciones internacionales más preocupantes relacionadas con la paz y la seguridad; y la otra, dedicada a hacer un llamamiento a buscar en la Ley natural la base de la convivencia humana, sea nacional o internacional, pues es la más adecuada al ser humano.

  2. Protocolo de actuación psicológica ante IMV.

    OpenAIRE

    Fernández Mariño, Silvia

    2014-01-01

    Se ha realizado la propuesta de un protocolo de actuación psicológica ante un incidente con múltiples víctimas. Este protocolo está orientado a proporcionar una guía de intervención para los profesionales de la salud mental en el caso de que se produzca un IMV en Asturias. Para ello, se han estudiado los primeros auxilios psicológicos, considerados como una respuesta, cuyo objetivo es proporcionar ayuda y apoyo prácticos a los afectados. Están compuestos de seis actitudes y seis acciones fun...

  3. Podrías llamarte Antígona. Un drama mexicano contemporáneo.

    Directory of Open Access Journals (Sweden)

    Helena González-Vaquerizo

    2014-04-01

    Full Text Available Este trabajo analiza los elementos del teatro griego en la estructura, personajes, temas y motivos de Podrías llamarte Antígona, escrita por Gabriela Ynclán en 2009. El drama es un ejemplo del teatro comprometido americano y retoma las claves de los mitos de Antígona y Edipo en la tradición occidental. La autora hace una lectura política y feminista de las obras sofocleas, pero sobre todo una humanista. De hecho, la pieza fue concebida como denuncia ante las autoridades por su actuación en la tragedia de la mina de carbón de Pasta de Conchos (Coahuila, México en febrero de 2006. Una explosión de gas causó la muerte de 65 trabajadores que resultaron enterrados en vida y cuyo rescate nunca se llevó a cabo. Este artículo describe además la génesis de la obra gracias al trabajo de la ONG Cereal y su recepción por parte de las familias de los fallecidos.

  4. Harnessing ant defence at fruits reduces bruchid seed predation in a symbiotic ant-plant mutualism.

    Science.gov (United States)

    Pringle, Elizabeth G

    2014-06-22

    In horizontally transmitted mutualisms, mutualists disperse separately and reassemble in each generation with partners genetically unrelated to those in the previous generation. Because of this, there should be no selection on either partner to enhance the other's reproductive output directly. In symbiotic ant-plant mutualisms, myrmecophytic plants host defensive ant colonies, and ants defend the plants from herbivores. Plants and ants disperse separately, and, although ant defence can indirectly increase plant reproduction by reducing folivory, it is unclear whether ants can also directly increase plant reproduction by defending seeds. The neotropical tree Cordia alliodora hosts colonies of Azteca pittieri ants. The trees produce domatia where ants nest at stem nodes and also at the node between the peduncle and the rachides of the infloresence. Unlike the stem domatia, these reproductive domatia senesce after the tree fruits each year. In this study, I show that the tree's resident ant colony moves into these ephemeral reproductive domatia, where they tend honeydew-producing scale insects and patrol the nearby developing fruits. The presence of ants significantly reduced pre-dispersal seed predation by Amblycerus bruchid beetles, thereby directly increasing plant reproductive output.

  5. Collective search by ants in microgravity

    Directory of Open Access Journals (Sweden)

    Stefanie M. Countryman

    2015-03-01

    Full Text Available The problem of collective search is a tradeoff between searching thoroughly and covering as much area as possible. This tradeoff depends on the density of searchers. Solutions to the problem of collective search are currently of much interest in robotics and in the study of distributed algorithms, for example to design ways that without central control robots can use local information to perform search and rescue operations. Ant colonies operate without central control. Because they can perceive only local, mostly chemical and tactile cues, they must search collectively to find resources and to monitor the colony's environment. Examining how ants in diverse environments solve the problem of collective search can elucidate how evolution has led to diverse forms of collective behavior. An experiment on the International Space Station in January 2014 examined how ants (Tetramorium caespitum perform collective search in microgravity. In the ISS experiment, the ants explored a small arena in which a barrier was lowered to increase the area and thus lower ant density. In microgravity, relative to ground controls, ants explored the area less thoroughly and took more convoluted paths. It appears that the difficulty of holding on to the surface interfered with the ants’ ability to search collectively. Ants frequently lost contact with the surface, but showed a remarkable ability to regain contact with the surface.

  6. Ant-lepidopteran associations along African forest edges

    Science.gov (United States)

    Dejean, Alain; Azémar, Frédéric; Libert, Michel; Compin, Arthur; Hérault, Bruno; Orivel, Jérôme; Bouyer, Thierry; Corbara, Bruno

    2017-02-01

    Working along forest edges, we aimed to determine how some caterpillars can co-exist with territorially dominant arboreal ants (TDAAs) in tropical Africa. We recorded caterpillars from 22 lepidopteran species living in the presence of five TDAA species. Among the defoliator and/or nectarivorous caterpillars that live on tree foliage, the Pyralidae and Nymphalidae use their silk to protect themselves from ant attacks. The Notodontidae and lycaenid Polyommatinae and Theclinae live in direct contact with ants; the Theclinae even reward ants with abundant secretions from their Newcomer gland. Lichen feeders (lycaenid; Poritiinae), protected by long bristles, also live among ants. Some lycaenid Miletinae caterpillars feed on ant-attended membracids, including in the shelters where the ants attend them; Lachnocnema caterpillars use their forelegs to obtain trophallaxis from their host ants. Caterpillars from other species live inside weaver ant nests. Those of the genus Euliphyra (Miletinae) feed on ant prey and brood and can obtain trophallaxis, while those from an Eberidae species only prey on host ant eggs. Eublemma albifascia (Erebidae) caterpillars use their thoracic legs to obtain trophallaxis and trophic eggs from ants. Through transfer bioassays of last instars, we noted that herbivorous caterpillars living in contact with ants were always accepted by alien conspecific ants; this is likely due to an intrinsic appeasing odor. Yet, caterpillars living in ant shelters or ant nests probably acquire cues from their host colonies because they were considered aliens and killed. We conclude that co-evolution with ants occurred similarly in the Heterocera and Rhopalocera.

  7. Pheromone disruption of Argentine ant trail integrity

    Science.gov (United States)

    Suckling, D.M.; Peck, R.W.; Manning, L.M.; Stringer, L.D.; Cappadonna, J.; El-Sayed, A. M.

    2008-01-01

    Disruption of Argentine ant trail following and reduced ability to forage (measured by bait location success) was achieved after presentation of an oversupply of trail pheromone, (Z)-9-hexadecenal. Experiments tested single pheromone point sources and dispersion of a formulation in small field plots. Ant walking behavior was recorded and digitized by using video tracking, before and after presentation of trail pheromone. Ants showed changes in three parameters within seconds of treatment: (1) Ants on trails normally showed a unimodal frequency distribution of walking track angles, but this pattern disappeared after presentation of the trail pheromone; (2) ants showed initial high trail integrity on a range of untreated substrates from painted walls to wooden or concrete floors, but this was significantly reduced following presentation of a point source of pheromone; (3) the number of ants in the pheromone-treated area increased over time, as recruitment apparently exceeded departures. To test trail disruption in small outdoor plots, the trail pheromone was formulated with carnuba wax-coated quartz laboratory sand (1 g quartz sand/0.2 g wax/1 mg pheromone). The pheromone formulation, with a half-life of 30 h, was applied by rotary spreader at four rates (0, 2.5, 7.5, and 25 mg pheromone/m2) to 1- and 4-m2 plots in Volcanoes National Park, Hawaii. Ant counts at bait cards in treated plots were significantly reduced compared to controls on the day of treatment, and there was a significant reduction in ant foraging for 2 days. These results show that trail pheromone disruption of Argentine ants is possible, but a much more durable formulation is needed before nest-level impacts can be expected. ?? 2008 Springer Science+Business Media, LLC.

  8. Karl Popper: antes y después de Kyoto

    Directory of Open Access Journals (Sweden)

    Zanotti, Gabriel

    1999-06-01

    Full Text Available Not available.En su último libro sobre Karl Popper, Mariano Artigas plantea una hermenéutica revolucionaria: muestra que la ética de Popper es el fundamento de su epistemología, y que el fundamento de esa ética está lejos del «conjeturalismo» que suele atribuirse a Popper. Artigas analiza qué significa en Popper la «fe irracional en la razón» y utiliza, como fuente inédita, el dramático relato que hace Popper de su relación con W. W. Bartley, por primera vez, en Kyoto, en 1992. Sea cual fuere la opinión del lector, el libro de Artigas divide la hermenéutica de Popper en un antes y un después.

  9. Europa y Estados Unidos ante los Derechos Humanos en Cuba

    Directory of Open Access Journals (Sweden)

    Susanne Gratius

    2008-01-01

    de la UE no han sido estrategias eficaces para promover los derechos humanos en la isla. Al ser diferentes, las políticas de la UE y EEUU incluso han contribuido a mantener el régimen castrista en el poder: la UE por su reconocimiento diplomático y la cooperación económica; EEUU, al proporcionar una imagen de enemigo externo. Por ello, y ante el nuevo panorama que ofrece el cambio de gobierno en Cuba, la próxima revisión de la Posición Común de la UE y las elecciones presidenciales en EEUU, es necesario replantearse los objetivos y estrategias políticas para incentivar los derechos humanos en Cuba.

  10. Disseny d’unitats de potabilització d’aigua mitjançant membranes alimentades amb energies renovables

    OpenAIRE

    Bargalló Poch, Josep Oriol

    2012-01-01

    En aquest projecte s’ha dissenyat una unitat de potabilització d’aigua mitjançant una membrana de separació, alimentada per energia renovable. En concret, s’ha dissenyat una planta portable capaç de dessalinitzar aigua de mar utilitzant energia solar. La dessalació és el procés de separació de minerals dissolts (sals) i altres substàncies indesitjables contingudes en les aigües salobres o marines, per convertir-les en aigua adequada per el consum humà, apte per el seu ús indust...

  11. What do myrmecophagous geckos eat when ants are not available ...

    African Journals Online (AJOL)

    Like other Pristurus species, P. samhaensis on Samha and P. sokotranus on Socotra were highly myrmecophagous (76.7% and 38.6% ants, respectively). However, ants were absent from the diet of P. samhaensis on Darsa. In contrast to the rich native ant fauna of the other islands, only one ant species was reported for ...

  12. ANTES DE QUE ANOCHEZCA. DERECHOS HUMANOS Y CLASES MEDIAS EN ARGENTINA ANTES Y EN LOS INICIOS DEL GOLPE DE ESTADO DE 1976

    Directory of Open Access Journals (Sweden)

    Sebastián CARASSAI

    2010-01-01

    Full Text Available En este trabajo se analiza el tema de los derechos humanos en Argentina antes y durante el comienzo del golpe de Estado de 1976 (1970-1977. Se argumenta que la inexistencia de una conciencia social sobre tales derechos en la primera mitad de la década y el temprano y extendido consenso en torno a lo que más tarde se llamará «teoría de los dos demonios» son dos elementos fundamentales a la hora de explicar la actitud de las clases medias no radicalizadas políticamente ante el surgimiento del discurso de los derechos humanos en Argentina.

  13. Ants as tools in sustainable agriculture

    DEFF Research Database (Denmark)

    Offenberg, Joachim

    2015-01-01

    1. With an expanding human population placing increasing pressure on the environment, agriculture needs sustainable production that can match conventional methods. Integrated pest management (IPM) is more sustainable, but not necessarily as efficient as conventional non-sustainable measures. 2...... in multiple crops. Their efficiency is comparable to chemical pesticides or higher, while at lower costs. They provide a rare example of documented efficient conservation biological control. 3. Weaver ants share beneficial traits with almost 13 000 other ant species and are unlikely to be unique...... of agricultural systems, this review emphasizes the potential of managing ants to achieve sustainable pest management solutions. The synthesis suggests future directions and may catalyse a research agenda on the utilization of ants, not only against arthropod pests, but also against weeds and plant diseases...

  14. Kunstikriitik Ants Juske sai doktoriks / Neeme Korv

    Index Scriptorium Estoniae

    Korv, Neeme, 1974-

    2003-01-01

    Tartu Kõrgema Kunstikooli rektor Ants Juske kaitses 7. veebruaril Tallinnas Kunstiakadeemias edukalt doktoriväitekirja, juhendajaks oli professor Boris Bernštein ning oponeerisid doktor Altti Kuusamo Soomest ja professor Peeter Tulviste

  15. Fungal enzymes in the attine ant symbiosis

    DEFF Research Database (Denmark)

    de Fine Licht, Henrik Hjarvard; Schiøtt, Morten; Boomsma, Jacobus Jan

    the more basal attine genera use substrates such as flowers, plant debris, small twigs, insect feces and insect carcasses. This diverse array of fungal substrates across the attine lineage implies that the symbiotic fungus needs different enzymes to break down the plant material that the ants provide...... or different efficiencies of enzyme function. Fungal enzymes that degrade plant cell walls may have functionally co-evolved with the ants in this scenario. We explore this hypothesis with direct measurements of enzyme activity in fungus gardens in 12 species across 8 genera spanning the entire phylogeny...... and diversity of life-styles within the attine clade. We find significant differences in enzyme activity between different genera and life-styles of the ants. How these findings relate to attine ant coevolution and crop optimization are discussed....

  16. Exotic ants (Hymenoptera, Formicidae) of Ohio

    OpenAIRE

    Ivanov,Kal

    2016-01-01

    The worldwide transfer of plants and animals outside their native ranges is an ever increasing problem for global biodiversity. Ants are no exception and many species have been transported to new locations often with profound negative impacts on local biota. The current study is based on data gathered since the publication of the “Ants of Ohio” in 2005. Here I expand on our knowledge of Ohio’s myrmecofauna by contributing new records, new distributional information and natural history notes. ...

  17. Improving Emergency Management by Modeling Ant Colonies

    Science.gov (United States)

    2015-03-01

    perform functions such as nursing the brood or maintaining the nest. The more mature workers will begin to travel outside the nest to perform foraging...small sized ants predominantly act in functional roles such as nurses or transport services within the nest. The larger sizes predominantly function...stages: the founding stage, the ergonomic stage, and the reproductive stage. The founding stage is marked by a queen ant successful mating and laying

  18. Extrafloral nectar fuels ant life in deserts

    OpenAIRE

    Aranda-Rickert, Adriana; Diez, Patricia; Marazzi, Brigitte

    2014-01-01

    Interactions mediated by extrafloral nectary (EFN)-bearing plants that reward ants with a sweet liquid secretion are well documented in temperate and tropical habitats. However, their distribution and abundance in deserts are poorly known. In this study, we test the predictions that biotic interactions between EFN plants and ants are abundant and common also in arid communities and that EFNs are only functional when new vegetative and reproductive structures are developing. In a seasonal dese...

  19. Chemically armed mercenary ants protect fungus-farming societies

    DEFF Research Database (Denmark)

    Adams, Rachelle Martha Marie; Liberti, Joanito; Illum, Anders A.

    2013-01-01

    guest ants are sufficient to kill raiders that invariably exterminate host nests without a cohabiting guest ant colony. We also show that the odor of guest ants discourages raider scouts from recruiting nestmates to host colonies. Our results imply that Sericomyrmex fungus-growers obtain a net benefit......The ants are extraordinary in having evolved many lineages that exploit closely related ant societies as social parasites, but social parasitism by distantly related ants is rare. Here we document the interaction dynamics among a Sericomyrmex fungus-growing ant host, a permanently associated...... parasitic guest ant of the genus Megalomyrmex, and a raiding agro-predator of the genus Gnamptogenys. We show experimentally that the guest ants protect their host colonies against agro-predator raids using alkaloid venom that is much more potent than the biting defenses of the host ants. Relatively few...

  20. El sitio de instalación de la Estación Científica Ecuatoriana en la Antártida

    OpenAIRE

    Horn, H.; Arrellano, H.

    1990-01-01

    La Punta Fort Williams, en la Isla Greenwich, fue el lugar seleccionado por el Programa Antártico Ecuatoriano para la construcción de la Estación Científica "Pedro Vicente Maldonado", proyecto que representa la decisión del Estado Ecuatoriano por incorporar la región Antártica al quehacer científico nacional. La estación, de tipo modular, está localizada en una plataforma plana y reciente, de terreno suelto a una altitud de 20 metros aproximadamente, constituida de sedimentos consolidados ...

  1. Toxic industrial deposit remediation by ant activity

    Science.gov (United States)

    Jilkova, Veronika; Frouz, Jan

    2016-04-01

    Toxic industrial deposits are often contaminated by heavy metals and the substrates have low pH values. In such systems, soil development is thus slowed down by high toxicity and acidic conditions which are unfavourable to soil fauna. Ants (Hymenoptera, Formicidae) are considered tolerant to heavy metal pollution and are known to increase organic matter content and microbial activity in their nests. Here, we focused on soil remediation caused by three ant species (Formica sanguinea, Lasius niger, and Tetramorium sp.) in an ore-washery sedimentation basin near Chvaletice (Czech Republic). Soil samples were taken from the centre of ant nests and from the nest surroundings (>3 m from nests). Samples were then analyzed for microbial activity and biomass and contents of organic matter and nutrients. As a result, ant species that most influenced soil properties was F. sanguinea as there were higher microbial activity and total nitrogen and ammonia contents in ant nests than in the surrounding soil. We expected such a result because F. sanguinea builds conspicuous large nests and is a carnivorous species that brings substantial amounts of nitrogen in insect prey to their nests. Effects of the other two ant species might be lower because of smaller nests and different feeding habits as they rely mainly on honeydew from aphids or on plant seeds that do not contain much nutrients.

  2. Congestion and communication in confined ant traffic

    Science.gov (United States)

    Gravish, Nick; Gold, Gregory; Zangwill, Andrew; Goodisman, Michael A. D.; Goldman, Daniel I.

    2014-03-01

    Many social animals move and communicate within confined spaces. In subterranean fire ants Solenopsis invicta, mobility within crowded nest tunnels is important for resource and information transport. Within confined tunnels, communication and traffic flow are at odds: trafficking ants communicate through tactile interactions while stopped, yet ants that stop to communicate impose physical obstacles on the traffic. We monitor the bi-directional flow of fire ant workers in laboratory tunnels of varied diameter D. The persistence time of communicating ant aggregations, τ, increases approximately linearly with the number of participating ants, n. The sensitivity of traffic flow increases as D decreases and diverges at a minimum diameter, Dc. A cellular automata model incorporating minimal traffic features--excluded volume and communication duration--reproduces features of the experiment. From the model we identify a competition between information transfer and the need to maintain jam-free traffic flow. We show that by balancing information transfer and traffic flow demands, an optimum group strategy exists which maximizes information throughput. We acknowledge funding from NSF PoLS #0957659 and #PHY-1205878.

  3. Fire ants perpetually rebuild sinking towers

    Science.gov (United States)

    Phonekeo, Sulisay; Mlot, Nathan; Monaenkova, Daria; Hu, David L.; Tovey, Craig

    2017-07-01

    In the aftermath of a flood, fire ants, Solenopsis invicta, cluster into temporary encampments. The encampments can contain hundreds of thousands of ants and reach over 30 ants high. How do ants build such tall structures without being crushed? In this combined experimental and theoretical study, we investigate the shape and rate of construction of ant towers around a central support. The towers are bell shaped, consistent with towers of constant strength such as the Eiffel tower, where each element bears an equal load. However, unlike the Eiffel tower, the ant tower is built through a process of trial and error, whereby failed portions avalanche until the final shape emerges. High-speed and novel X-ray videography reveal that the tower constantly sinks and is rebuilt, reminiscent of large multicellular systems such as human skin. We combine the behavioural rules that produce rafts on water with measurements of adhesion and attachment strength to model the rate of growth of the tower. The model correctly predicts that the growth rate decreases as the support diameter increases. This work may inspire the design of synthetic swarms capable of building in vertical layers.

  4. Cuando dialogan dos Antígonas: La tumba de Antígona de María Zambrano y Antígona furiosa de Griselda Gambaro

    Directory of Open Access Journals (Sweden)

    Rose Duroux

    2012-08-01

    Full Text Available Antígona ha sido un tópico por más de 2.000 años, participando de una historia que siempre puede ser reconocida. Tanto la Guerra Civil española como la dictadura argentina vieron surgir Antígonas en busca de justicia. A partir de los trabajos de María Zambrano y Griselda Gambaro, este artículo busca rehabilitar discursivamente estas versiones. Por un lado, la filósofa española nunca regresó del exilio iniciado en 1939 y defendió hasta el final los valores republicanos. Cuando asumió que su expatriación era irreversible, ingresó en un exilio profundo del cual Antígona revela lo esencial, pasando de la "privación" a la "revelación" tanto en un modo filosófico como en el poético, tanto en sus ensayos como en su única pieza teatral, La Tumba de Antígona [1967], una significativa metáfora de la guerra fratricida y del exilio. Por otro, Antígona furiosa [1986] de Gambaro, reescribe la tragedia de Sófocles cuando denuncia el terrorismo de estado argentino en una furiosa Antígona. Gambaro, hermana y madre de desaparecidos de la guerra sucia eleva su grito por justicia en nombre de la fraternidad humanaAntigone has been a topical figure for more than 2,000 years. She plays a part in a story that one can always identify. Spanish Civil War and Argentine dictatorship saw the birth of many Antigones seeking justice. Starting from the M. Zambrano and G. Gambaro's creations, this work rehabilitates the speech and the incarnations of the Iberian and Ibero-american Antigone. On the one hand, Spanish philosopher María Zambrano never came out of the exodus which began in 1939, and she defended the values of the Republic all the way. Once she acknowledged that expatriation was irreversible, she entered a profound exile of which Antigone reveals the essence, going from "deprivation" to "revelation" in a philosophical as well as a poetical manner, both in her essays and in her unique play, La Tumba de Antígona [1967], a striking metaphor

  5. Plan de mercadeo para una promotora de eventos corporativos

    OpenAIRE

    Burbano Zhindon, Andrea Cristina; Chavez Lopez, Maria Cecilia; Orlando Haro, Sofia Pierina; Miranda, Jorge Luis

    2009-01-01

    Este proyecto presenta una alternativa para todas aquellas empresas que realizan eventos frecuentemente, ofreciéndoles un servicio personalizado para la coordinación de cada uno de los detalles que conlleva la organización de un evento. El objetivo fundamental de este estudio es desarrollar un plan de mercadeo para el servicio antes mencionado, aplicando los principios del marketing para su correcta implementación.

  6. Aquellos que nos verán morir: Significado y respuesta de los profesionales sanitarios de una residencia de ancianos ante la muerte y los moribundos Those who will see us die: Meaning and answer to death and moribund people by health workers of a nursing home

    Directory of Open Access Journals (Sweden)

    Rafael Montoya Juárez

    2006-06-01

    Full Text Available La muerte se considera en nuestra sociedad un tabú, como también lo es para las instituciones y profesionales sanitarios. La muerte debe estar inserta en un proceso de morir; la inclusión de una persona en este proceso está condicionada por factores sociales y culturales. De la consideración de una persona como moribundo dependen muchas decisiones y actitudes de la propia persona y de los que rodea. Metodología: se decidió conducir nueve entrevistas semi-estructuradas a personal sanitario de una residencia de ancianos en contacto directo con el moribundo, con el fin de determinar qué significa para ellos la muerte, qué actitudes y comportamientos tienen para con los moribundos, cómo distinguen a aquel que muere, y qué factores condicionan el proceso de morir en ese ámbito privilegiado de estudio. Resultados: el profesional considera la muerte de los residentes un descanso, cree que puede identificar al moribundo y trata de calcular el momento del deceso. El comportamiento de los trabajadores con los moribundos cambia respecto al resto de los residentes. El factor ambiental que más influye en el comportamiento con los moribundos es la falta de tiempo. La metodología cualitativa es necesaria para estudiar el proceso de morir.Death is a taboo in our society as well as for health institutions and workers. Death should be inserted into a process of dying; The inclusion of a person within this process is conditioned by social and cultural factors. Many decisions and attitudes of a person and of those near him depend on the fact of considering him a moribund person. Nine semi-structured interviews were carried out to health workers of a residential home for the elderly who are in contact with moribund people. The aim was to determine what meaning death has for them, what attitudes and behaviours they have towards moribund people, how they distinguish those who are dying and what factors condition the process of dying in that privileged

  7. Enfermería ante la muerte: Importancia de la formación ante este proceso. Revisión Bibliográfica

    OpenAIRE

    Peláez Arnillas, Elena

    2016-01-01

    Introducción: La muerte es la consecuencia inevitable de la vida e inherente al ser humano, sin embargo sigue siendo un tema tabú en muchas culturas. Los profesionales de enfermería deben mostrar una correcta actitud ante la muerte para así, poder apoyar y acompañar a los pacientes moribundos y a sus familiares, facilitando el proceso de duelo. La formación en este tema es fundamental y necesaria para proporcionar unos cuidados de calidad, puesto que, es la enfermera la que ...

  8. Día mundial del sonido, 22 de octubre: Una iniciativa nacional para una efeméride mundial

    OpenAIRE

    DAUMAL DOMÈNECH, FRANCESC; Cerdà i Ferrer, Josep; Luceño Ramos, Marisa; Giménez Pérez, Alicia

    2014-01-01

    El Día Mundial del Sonido es el día del Sonido Positivo y se entiende por sonido positivo el que sirve al ser humano para conocerse mejor a sí mismo y a su especie, para sobrevivir, para inspeccionar su entorno, obteniendo toda una variada gama de información. Como sabemos, el sonido positivo está presente en nuestras vidas en todos sus aspectos. Es percibido desde antes del nacimiento por el ser humano, preparado desde entonces para distinguir una cantidad infinita de...

  9. The distribution of weaver ant pheromones on host trees

    DEFF Research Database (Denmark)

    Offenberg, Joachim

    2007-01-01

    The visible anal spots deposited by Oecophylla smaragdina ants have been suggested to deter ant prey, affect interspecific competition and facilitate mutualists and parasites in tracking down Oecophylla ants. I measured the density of anal spots on host trees with and without ants and tested for ...... to leaves. Also there was a positive correlation between spot density and the likelihood of being detected by ants. Anal spots may thus function as reliable cues to interacting species and be an important factor in shaping the community around Oecophylla colonies.......The visible anal spots deposited by Oecophylla smaragdina ants have been suggested to deter ant prey, affect interspecific competition and facilitate mutualists and parasites in tracking down Oecophylla ants. I measured the density of anal spots on host trees with and without ants and tested...... for correlations between spot density, ant activity and the likelihood of being detected by an ant. Spots were only found on trees with ants. On ant-trees, spots were distributed throughout the trees but with higher densities in areas with high ant activity and pheromone densities were higher on twigs compared...

  10. Conocimientos de padres de niños con síndrome de Down sobre trastornos del lenguaje antes y después de una estrategia educativa Parent's knowledge about language disorders of children with Down syndrome before and after an educational strategy

    Directory of Open Access Journals (Sweden)

    Eloy J Pineda Pérez

    2013-03-01

    Full Text Available Introducción: el lenguaje es un mecanismo primordial en la comunicación humana, el cual ejerce una influencia positiva en la esfera psicológica del individuo. En los niños con síndorme de Down son frecuentes los trastornos del lenguaje y aunque existen programas diseñados para padres y educadores, estos deben ser extensivos y ajustados para aplicar a las familias de estos niños. Objetivo: incrementar el conocimiento sobre los trastornos del lenguaje en los padres y/o madres de niños con síndorme de Down de un círculo infantil especial, a través de una estrategia educativa. Métodos: se aplicó una estrategia educativa con un diseño ambispectivo de estudio pre-test y post-test, para explorar el conocimiento que poseían un grupo de padres y/o madres sobre el desarrollo del lenguaje de sus hijos con síndorme de Down, matriculados en un círculo Infantil especial. El estudio se dividió en tres fases: en la fase inicial se aplicó una encuesta; en la segunda fase se aplicaron los talleres a todos los padres y/o madres; y la tercera fase consistió en la aplicación de la encuesta inicial. Resultados: después de los talleres todos los padres y/o madres reconocían los trastornos del lenguaje en sus hijos, la participación en la estimulación aumentó significativamente al lograrse que 19 (90,5 % de ellos cooperaran y las perspectivas de mejoría futura mejoraron significativamente pues estuvieron presentes en 14 (66,7 % progenitores. Conclusiones: aumentó el conocimiento de los padres y/o madres sobre los trastornos del lenguaje, a partir de la estrategia educativa desarrollada por los mismos.Background: language is a fundamental mechanism in human communication which has a positive influence on the psychological sphere of the individual. In children with Down syndrome, language disorders are common although there are programs which have been designed for parents and educators, which should be extended and adjusted to apply them to

  11. Indiferencia y sentido. Los jóvenes mexicanos ante la religión.

    OpenAIRE

    Luengo-González, Enrique

    2004-01-01

    El artículo presenta los rasgos más sobresalientes y hace una interpretación de los resultados de una encuesta nacional en México sobre la percepción que los jóvenes tienen de la religión. Ante la tendencia decreciente de la religiosidad en los jóvenes, la pregunta que intenta explorar el escrito es: ¿qué es lo que ahora puede permitir un nuevo fermento de re-ligación comunitaria, que permita resistir a la crueldad del mundo y a una cosmovisión que contemple la necesaria articulación y cuidad...

  12. Fuzzy Rules for Ant Based Clustering Algorithm

    Directory of Open Access Journals (Sweden)

    Amira Hamdi

    2016-01-01

    Full Text Available This paper provides a new intelligent technique for semisupervised data clustering problem that combines the Ant System (AS algorithm with the fuzzy c-means (FCM clustering algorithm. Our proposed approach, called F-ASClass algorithm, is a distributed algorithm inspired by foraging behavior observed in ant colonyT. The ability of ants to find the shortest path forms the basis of our proposed approach. In the first step, several colonies of cooperating entities, called artificial ants, are used to find shortest paths in a complete graph that we called graph-data. The number of colonies used in F-ASClass is equal to the number of clusters in dataset. Hence, the partition matrix of dataset founded by artificial ants is given in the second step, to the fuzzy c-means technique in order to assign unclassified objects generated in the first step. The proposed approach is tested on artificial and real datasets, and its performance is compared with those of K-means, K-medoid, and FCM algorithms. Experimental section shows that F-ASClass performs better according to the error rate classification, accuracy, and separation index.

  13. Conducta conservadora ante el traumatismo esplénico

    Directory of Open Access Journals (Sweden)

    María Eugenia Ferro Moreira

    2011-03-01

    Full Text Available INTRODUCCIÓN. El bazo es el órgano que más frecuentemente se lesiona en los traumatismos abdominales. Fueron objetivos de este trabajo describir la conducta conservadora ante el traumatismo esplénico y determinar su frecuencia en el Hospital Pediátrico «Juan Manuel Márquez», centro provincial de atención al niño politraumatizado, donde se preconiza esta conducta por los beneficios que ofrece la preservación del bazo a la función inmunológica. MÉTODOS. Se realizó un estudio prospectivo con 36 pacientes con traumatismo esplénico que fueron tratados de forma conservadora teniendo como criterio principal la estabilidad hemodinámica del paciente. Se analizó edad, sexo, causa de lesión esplénica, lesiones asociadas, tratamiento conservador realizado, complicaciones y estadía hospitalaria. RESULTADOS. El traumatismo esplénico estuvo presente en el 66,6 % de los traumatismos abdominales. Las causas más frecuentes fueron los accidentes de tránsito (50 %, seguidos de las caídas desde alturas (33 %. En el 89 % de los pacientes se siguió una conducta conservadora: en el 88 % de los casos se aplicó tratamiento médico conservador y en el 11 %, métodos quirúrgicos de conservación esplénica. CONCLUSIONES. Todas las lesiones ocurrieron por traumatismos contusos. Las técnicas quirúrgicas utilizadas fueron dos esplenorrafias y una esplenectomía parcial. No hubo fallecidos y las complicaciones fueron mínimas, por lo que consideramos que la conducta conservadora del traumatismo esplénico es una modalidad de tratamiento segura en la infancia.

  14. Kin-informative recognition cues in ants

    DEFF Research Database (Denmark)

    Nehring, Volker; Evison, Sophie E F; Santorelli, Lorenzo A

    2011-01-01

    behaviour is thought to be rare in one of the classic examples of cooperation--social insect colonies--because the colony-level costs of individual selfishness select against cues that would allow workers to recognize their closest relatives. In accord with this, previous studies of wasps and ants have...... found little or no kin information in recognition cues. Here, we test the hypothesis that social insects do not have kin-informative recognition cues by investigating the recognition cues and relatedness of workers from four colonies of the ant Acromyrmex octospinosus. Contrary to the theoretical...... prediction, we show that the cuticular hydrocarbons of ant workers in all four colonies are informative enough to allow full-sisters to be distinguished from half-sisters with a high accuracy. These results contradict the hypothesis of non-heritable recognition cues and suggest that there is more potential...

  15. Ant parasite queens revert to mating singly

    DEFF Research Database (Denmark)

    Sumner, Seirian; Hughes, William Owen Hamar; Pedersen, Jes Søe

    2004-01-01

    quantified and they tend to be similar in related species. Here we compare the mating strategies of the leaf-cutting ant Acromyrmex echinatior and its recently derived social parasite Acromyrmex insinuator, which is also its closest relative 2 (see Fig. 1 ). We find that although the host queens mate with up......A parasitic ant has abandoned the multiple mating habit of the queens of its related host. Multiple mating (polyandry) is widespread among animal groups, particularly insects 1 . But the factors that maintain it and underlie its evolution are hard to verify because benefits and costs are not easily...... to a dozen different males, the social parasite mates only singly. This rapid and surprising reversion to single mating in a socially parasitic ant indicates that the costs of polyandry are probably specific to a free-living lifestyle....

  16. The worldwide expansion of the Argentine ant

    DEFF Research Database (Denmark)

    Vogel, Valerie; Pedersen, Jes Søe; Giraud, Tatiana

    2010-01-01

    Aim The aim of this study was to determine the number of successful establishments of the invasive Argentine ant outside native range and to see whether introduced supercolonies have resulted from single or multiple introductions. We also compared the genetic diversity of native versus introduced...... supercolonies to assess the size of the propagules (i.e. the number of founding individuals) at the origin of the introduced supercolonies. Location Global. Methods We used mitochondrial DNA (mtDNA) markers and microsatellite loci to study 39 supercolonies of the Argentine ant Linepithema humile covering both......) and secondary introductions (from sites with established invasive supercolonies) were important in the global expansion of the Argentine ant. In combination with the similar social organization of colonies in the native and introduced range, this indicates that invasiveness did not evolve recently as a unique...

  17. Desert ants learn vibration and magnetic landmarks.

    Directory of Open Access Journals (Sweden)

    Cornelia Buehlmann

    Full Text Available The desert ants Cataglyphis navigate not only by path integration but also by using visual and olfactory landmarks to pinpoint the nest entrance. Here we show that Cataglyphis noda can additionally use magnetic and vibrational landmarks as nest-defining cues. The magnetic field may typically provide directional rather than positional information, and vibrational signals so far have been shown to be involved in social behavior. Thus it remains questionable if magnetic and vibration landmarks are usually provided by the ants' habitat as nest-defining cues. However, our results point to the flexibility of the ants' navigational system, which even makes use of cues that are probably most often sensed in a different context.

  18. Survey of rubella knowledge and acceptability of rubella vaccination among Brazilian adults prior to mass vaccination Encuesta sobre el conocimiento de la rubéola y la aceptabilidad de la vacunación antirrubeólica en los adultos brasileños antes de una campaña de vacunación masiva

    Directory of Open Access Journals (Sweden)

    Juliana Costa Vieira

    2011-10-01

    Full Text Available OBJECTIVE: Evaluate knowledge of rubella and acceptability of vaccination and identify sources of health information among brazilian adults to inform communication strategies for a national vaccination campaign to eliminate rubella and congenital rubella syndrome (CRS. METHODS: From 5-8 July 2008 a qualitative telephone survey was conducted among a nonprobabilistic sample of brazilian adults 18 to 65 years of age (n = 1 023 from all five geographic regions of Brazil to measure knowledge of rubella and willingness to receive the vaccine and to identify sources of health information. Frequencies of responses were stratified by respondents' sex, age, education, and income. RESULTS: Although 69.9% of respondents said they knew what rubella was, actual knowledge of the disease was limited, with only 29.9% answering affirmatively when asked if they would recognize symptoms of rubella infection. Self-reported knowledge increased with increasing age, education, and income, and was higher among women than men. A total of 94.5% of the respondents expressed willingness to be vaccinated for rubella elimination. The most frequently mentioned sources of health information were television and doctors. CONCLUSIONS: Despite limited knowledge of rubella, brazilian adults expressed willingness to be vaccinated for disease elimination.OBJETIVO: Evaluar el conocimiento de la rubéola y la aceptabilidad de la vacunación antirrubeólica, y determinar las fuentes de información sanitaria en los adultos brasileños, con objeto de fundamentar las estrategias de comunicación de una campaña nacional de vacunación dirigida a eliminar la rubéola y el síndrome de rubéola congénita (SRC. MÉTODOS: Del 5 al 8 de julio del 2008 se llevó a cabo una encuesta telefónica cualitativa en una muestra no probabilística de adultos brasileños de 18 a 65 años de edad (n = 1 023 de las cinco regiones geográficas del Brasil, con objeto de evaluar el conocimiento de la rub

  19. A Comparison between General Population Mortality and Life Tables for Insurance in Mexico under Gender Proportion Inequality || Una comparación entre la mortalidad de la población general y las tablas de vida de los seguros en México ante porcentajes desiguales de género

    Directory of Open Access Journals (Sweden)

    Ornelas, Arelly

    2013-01-01

    Full Text Available We model the mortality behavior of the general population in Mexico using data from 1990 to 2009 and compare it to the mortality assumed in the tables used in Mexico for insured lives. We _t a Lee-Carter model, a Renshaw-Haberman model and an Age-Period-Cohort model. The data used are drawn from the Mexican National Institute of Statistics and Geography (INEGI and the National Population Council (CONAPO. We also fit a Brass-type relational model to compare gaps between general population mortality and the mortality estimates for the insured population used by the National Insurance and Finance Commission in Mexico. As the life tables for insured lives are unisex, i.e. they do not differentiate between men and women, we assume various sex ratios in the mortality tables for insured lives. We compare our results with those obtained for Switzerland and observe very similar outcomes. We emphasize the limitations of the mortality tables used by insurance companies in Mexico. We also discuss the bias incurred when using unisex mortality tables if the proportion of male and female policyholders in an insurance company is not balanced. || Interesados en conocer las diferencias entre la mortalidad general y la de un subgrupo de la población, como son los asegurados en una compañía de seguros, hemos ajustado un modelo relacional Brass-Type. Para ello, en primer lugar, hemos modelado el comportamiento de la mortalidad de la población general de México entre los años 1990 y 2009. Hemos ajustado un modelo Lee-Carter, un modelo Renshaw-Haberman y un modelo edad-período-cohorte. Los datos utilizados proceden del Instituto Nacional de Estadística y Geografía (INEGI y el Consejo Nacional de Población (CONAPO. Una vez estimadas las tasas de mortalidad se han comparado con la mortalidad asumida por las compañías aseguradoras mexicanas. Estas tasas de mortalidad han sido calculadas por la Comisión Nacional de Seguros y Finanzas de México. Como las

  20. El Tratado Antártico, vehículo de paz en un campo minado

    OpenAIRE

    Prieto Larrain, M. Cristina

    2004-01-01

    El 99% de la superficie de la Antártica, esto es 14 millones de Km², está cubierta por hielos de unos 2 Km de profundidad. Además de ser el continente más frío, la Antártica es también el más seco, ventoso y alto del mundo, con una elevación media de 2.500 Mt. Tales características físicas explican la ausencia de población humana indígena en el área, así como lo tardío de su exploración y explotación por parte de estados europeos y americanos entre otros. Sólo a partir del siglo XVIII comienz...

  1. Modelat BIM d’un equipament esportiu existent mitjançant escanejat 3D

    OpenAIRE

    Gaspar Martin, Laura

    2015-01-01

    El projecte contempla la elaboració d’un modelat BIM "asbuilt" d’un equipament esportiu existent de uns 55000m2 de superfície per uns 48 m d'alçada màxima. El procés a partir del qual es farà el modelat serà mitjançant els núvols de punts aportats per l'escanejat d’un làser 3D i fotos de 360 graus. El projecte contindrà tot el procés d’elaboració des de la recaptació de punts mitjançant làser 3D i fotos que ens passa una empresa col•laboradora, els quals nosaltres modifiquem pe...

  2. Ansiedad ante los exámenes en alumnos de Educación Secundaria Obligatoria || Anxiety in students from junior high-school

    Directory of Open Access Journals (Sweden)

    Alba Rodríguez

    2014-12-01

    Full Text Available El presente trabajo tiene como objetivo identificar el grado de ansiedad ante los exámenes. Para llevar a cabo el estudio se ha utilizado el Cuestionario de Evaluación de Ansiedad ante los Exámenes (CAEX administrado a 325 estudiantes de ESO. Los resultados pusieron de manifiesto que el perfil de estudiante que posee mayores niveles de ansiedad ante los exámenes es una mujer de 12 años, que estudia 1º ESO en un colegio privado-concertado y aprueba todas las asignaturas. Se puede concluir en primer lugar que la ansiedad ante los exámenes afecta significativamente a los estudiantes de la muestra, y en segundo lugar, se han encontrado diferencias estadísticamente significativas en las variables edad, sexo, tipo de centro, curso y rendimiento académico.

  3. Transmisibilidad y gravedad de la pandemia de gripe A(H1N12009 en España Transmissibility and severity of the pandemic influenza A (H1N1 2009 virus in Spain

    Directory of Open Access Journals (Sweden)

    Lorena Simón Méndez

    2011-08-01

    veces el promedio anual ajustado de las temporadas interpandémicas de comparación (1.802. Conclusiones: Los valores estimados de R0 durante la fase de crecimiento de la onda pandémica se encuentran en el rango inferior de estimaciones de ese parámetro en pandemias anteriores. Los indicadores de mortalidad calculados en el periodo pandémico señalan un aumento de las defunciones, en comparación con temporadas interpándemicas previas, más acusado en edades jóvenes.Objectives: To estimate the value of the basic reproduction number for the pandemic wave of influenza A (H1N1 2009 in Spain and to assess its impact on morbidity and mortality in the Spanish population compared with those in the previous influenza season. Methods: Data on the incidence of influenza and viral detections were obtained from the Spanish Influenza Surveillance System. Deaths from pandemic influenza were obtained from the Coordinating Center for Health Alerts and Emergencies of the Spanish Ministry of Health and Social Policy, and deaths from seasonal influenza during the period 2003-2008 were obtained from the National Statistics Institute. The reproduction number was estimated by two methods: firstly, by using the growth rate of the cumulative incidence of influenza during the exponential growth phase of the pandemic wave, and secondly (maximum likelihood estimation, through analysis the dates of onset of symptoms observed in pairs of cases based on generation time distribution. We calculated the fatality rate and mortality from influenza by comparing potential years of life lost in the pandemic season with those in previous interpandemic seasons. Results: The start of the pandemic wave occurred in Spain earlier in week 40/2009 (from 4 to 10 October, with an absolute predominance of the new strain in the pattern of circulating viruses. The value of R0 in the growth phase of the wave was 1.29 (95% CI: 1.25-1.33, estimated with the first method, and was 1.01 (95% CI: 0.99-1.03 with the second

  4. Ant-plants and fungi: a new threeway symbiosis.

    Science.gov (United States)

    Defossez, Emmanuel; Selosse, Marc-André; Dubois, Marie-Pierre; Mondolot, Laurence; Faccio, Antonella; Djieto-Lordon, Champlain; McKey, Doyle; Blatrix, Rumsaïs

    2009-06-01

    Symbioses between plants and fungi, fungi and ants, and ants and plants all play important roles in ecosystems. Symbioses involving all three partners appear to be rare. Here, we describe a novel tripartite symbiosis in which ants and a fungus inhabit domatia of an ant-plant, and present evidence that such interactions are widespread. We investigated 139 individuals of the African ant-plant Leonardoxa africana for occurrence of fungus. Behaviour of mutualist ants toward the fungus within domatia was observed using a video camera fitted with an endoscope. Fungi were identified by sequencing a fragment of their ribosomal DNA. Fungi were always present in domatia occupied by mutualist ants but never in domatia occupied by opportunistic or parasitic ants. Ants appear to favour the propagation, removal and maintenance of the fungus. Similar fungi were associated with other ant-plants in Cameroon. All belong to the ascomycete order Chaetothyriales; those from L. africana formed a monophyletic clade. These new plant-ant-fungus associations seem to be specific, as demonstrated within Leonardoxa and as suggested by fungal phyletic identities. Such tripartite associations are widespread in African ant-plants but have long been overlooked. Taking fungal partners into account will greatly enhance our understanding of symbiotic ant-plant mutualisms.

  5. Ants of the Peloponnese, Greece (Hymenoptera: Formicidae

    Directory of Open Access Journals (Sweden)

    Borowiec Lech

    2017-09-01

    Full Text Available This paper relates to material obtained during two field trips to the Peloponnese in 2013 and 2016. With the inclusion of some hitherto unpublished ant material, it gives new records from a total of 92 sampling localities. 129 species (including morphospecies not attributed to any known taxon of ants have been recorded from the Peloponnese (southern Greece, 27 of which have been recorded from this region for the first time. Lasius reginae and 5 other morphospecies attributed only to species complexes are new to Greece.

  6. Image Edge Tracking via Ant Colony Optimization

    Science.gov (United States)

    Li, Ruowei; Wu, Hongkun; Liu, Shilong; Rahman, M. A.; Liu, Sanchi; Kwok, Ngai Ming

    2018-04-01

    A good edge plot should use continuous thin lines to describe the complete contour of the captured object. However, the detection of weak edges is a challenging task because of the associated low pixel intensities. Ant Colony Optimization (ACO) has been employed by many researchers to address this problem. The algorithm is a meta-heuristic method developed by mimicking the natural behaviour of ants. It uses iterative searches to find the optimal solution that cannot be found via traditional optimization approaches. In this work, ACO is employed to track and repair broken edges obtained via conventional Sobel edge detector to produced a result with more connected edges.

  7. La investigación en Comunicación ante una encrucijada: de la teoría de los campos a la diseminación y diversidad gnoseológica. Estudio inicial comparado entre España, Brasil y Chile

    Directory of Open Access Journals (Sweden)

    Víctor Silva Echeto

    2014-01-01

    Full Text Available Desde sus inicios, la comunicación fue un espacio de investigación diver - so, complejo, atravesado por múltiples influencias (sociológicas, políticas, económicas y semióticas. En ese contexto, la teoría de los campos (apun - talada por Pierre Bourdieu brindó las posibilidades de estructuración y de autonomía, como mecanismo de reducir esa diversidad. Sin embargo, en estos años la heteronomía del campo, ha conducido a la comunicación (como en el caso del arte u otras disciplinas a influenciarse por contextos globales, inter y transdisciplinarios e intermediales (o transmediales, por tanto, no son los medios su objeto de investigación en sí mismos, sino una diversidad gnoseológica. En el artículo, se pone en discusión estos aspec - tos teóricos, contrastándolos con un estudio comparado –inicial– sobre la investigación en comunicación en España, Brasil y Chile, tres de los países con un mayor desarrollo en los últimos años.

  8. Actitud y miedo ante la muerte en adultos mayores

    Directory of Open Access Journals (Sweden)

    Ana Fernanda Uribe Rodríguez

    2007-01-01

    Full Text Available A través de los años el tema de la muerte se ha conceptualizado de diversas maneras. En la actualidad las personas evitan hablar del tema y se observa conductas evitativas, de miedo y ansiedad. El presente artículo tiene como objetivo evaluar la actitud y miedo ante la muerte en una muestra de 170 adultos mayores ( X :71,02; DT=5,946 de la ciudad de Cali-Colombia por medio del Perfil Revisado de Actitudes hacia la Muerte (PAM-R y la Escala de Collet-Lester (1969; se tuvo en cuenta las variables sexo, religión y estrato socioeconómico. Los resultados muestran diferencias significativas en función del sexo en las escalas de miedo a la propia muerte, evitación de la muerte, aceptación de acercamiento. Con relación al estrato socioeconómico se encontraron diferencias significativas en las escalas de miedo a la muerte y aceptación de acercamiento y en función de la religión sólo hay diferencias significativas en la evitación a la muerte. Se concluye la importancia de contribuir desde la psicología, al mejoramiento en los procesos de adaptación a los duelos y disminuir la presencia de duelos patológicos que se generan ante situaciones inesperadas y mal elaboradas en este caso, en los adultos mayores.

  9. Oecophylla smaragdina food conversion efficiency: prospects for ant farming

    DEFF Research Database (Denmark)

    Offenberg, Hans Joachim

    2011-01-01

    can be combined with the use of the ants in biological control programmes in tropical plantations where pest insects are converted into ant biomass. To assess the cost-benefits of ant farming based on artificial feeding, food consumption and food conversion efficiency (ECI) of Oecophylla smaragdina......Oecophylla ants are sold at high prices on several commercial markets as a human delicacy, as pet food or as traditional medicine. Currently markets are supplied by ants collected from the wild; however, an increasing interest in ant farming exists as all harvest is easily sold and as ant farming...... selling prices these efficiencies led to rates of return from 1.52 to 4.56, respectively, if: (i) protein is supplied from commercial products; or (ii) alternatively supplied from free sources such as insects and kitchen waste. These results suggest that Oecophylla ant farming may become highly profitable...

  10. Hybrid Bee Ant Colony Algorithm for Effective Load Balancing And ...

    African Journals Online (AJOL)

    PROF. OLIVER OSUAGWA

    Ant Colony algorithm is used in this hybrid Bee Ant Colony algorithm to solve load balancing issues ... Genetic Algorithm (MO-GA) for dynamic job scheduling that .... Information Networking and Applications Workshops. [7]. M. Dorigo & T.

  11. The use of weaver ants (Oecophylla spp.) in tropical agriculture

    DEFF Research Database (Denmark)

    Offenberg, Hans Joachim

    2011-01-01

    by the consumed pest insects, can be harvested and utilised for nutrition as they are tasty and high in proteins, vitamins and minerals. Thus, plantations may function as ant farms and in addition to plant production also hosts the production of edible animal protein. In this setup harmful pest insects are turned...... farming as a way forward to solve an increasing future demand for protein. Weaver ant farming may build on natural food collected by the ants or alternatively be boosted by feeding the ant colonies actively with protein and sugar. In both cases, when ant biocontrol is combined with ant farming......, the environmental cost of protein production may fall even lower than for other insects as the ants feed on pests that would otherwise reduce the plant yield and since the farming area is simultaneously in use for plant production. In this presentation I provide data showing (i) how the harvest of ants can...

  12. Dealing with water deficit in Atta ant colonies: large ants scout for water while small ants transport it

    Directory of Open Access Journals (Sweden)

    Antonio Carlos Da-Silva

    2012-07-01

    Leafcutter ants (Atta sexdens rubropilosa (Forel 1908 have an elaborate social organization, complete with caste divisions. Activities carried out by specialist groups contribute to the overall success and survival of the colony when it is confronted with environmental challenges such as dehydration. Ants detect variations in humidity inside the nest and react by activating several types of behavior that enhance water uptake and decrease water loss, but it is not clear whether or not a single caste collects water regardless of the cost of bringing this resource back to the colony. Accordingly, we investigated water collection activities in three colonies of Atta sexdens rubropilosa experimentally exposed to water stress. Specifically, we analyzed whether or not the same ant caste foraged for water, regardless of the absolute energetic cost (distance of transporting this resource back to the colony. Our experimental design offered water sources at 0 m, 1 m and 10 m from the nest. We studied the body size of ants near the water sources from the initial offer of water (time  =  0 to 120 min, and tested for specialization. We observed a reduction in the average size and variance of ants that corroborated the specialization hypothesis. Although the temporal course of specialization changed with distance, the final outcome was similar among distances. Thus, we conclude that, for this species, a specialist (our use of the word “specialist” does not mean exclusive task force is responsible for collecting water, regardless of the cost of transporting water back to the colony.

  13. Respuestas psicofisiológicas ante estímulos asociados al tabaco: Diferencias entre fumadores y no fumadores

    Directory of Open Access Journals (Sweden)

    Carlos Gantiva

    2016-09-01

    Full Text Available Las respuestas emocionales y motivacionales son fundamentales para explicar el inicio y mantenimiento del consumo de tabaco; sin embargo, las diferencias en fumadores y no fumadores de las respuestas psicofisiológicas que sirven como marcadores neurofisiológicos de procesos emocionales y motivacionales presentan resultados contradictorios. El objetivo de esta investigación fue identificar las diferencias en las respuestas psicofisiológicas ante estímulos asociados al tabaco en fumadores y no fumadores. Para esto se registró el reflejo de sobresalto y la respuesta galvánica de la piel mientras observaban imágenes apetitivas, neutrales, aversivas y asociadas al tabaco. Los resultados muestran que los fumadores inhiben el reflejo de sobresalto ante las imágenes asociadas al tabaco de forma similar que ante las imágenes apetitivas; así mismo, se encontró en los fumadores una mayor inhibición del reflejo de sobresalto ante las imágenes de tabaco. No se encontraron diferencias en la respuesta galvánica de la piel. Estos resultados sugieren que los fumadores activan el sistema motivacional apetitivo ante los estímulos asociados al tabaco.

  14. Crónica de una muerte anunciada: la jurisdicción de los tribunales españoles sobre crímenes internacionales antes y después de la Ley Orgánica 1/2014 relativa a la justicia universal

    Directory of Open Access Journals (Sweden)

    Enrique Carnero Rojo

    2015-09-01

    Full Text Available En marzo de 2014, el Parlamento español reformó la jurisdicción universal de los tribunales nacionales. El presente artículo analiza la evolución legislativa que condujo a esta reforma, sus orígenes políticos y sus consecuencias en la práctica judicial. Tal análisis demuestra que las limitaciones al ejercicio de la jurisdicción española sobre crímenes internacionales cometidos en el extranjero contra víctimas no españolas  comenzaron por vía judicial en el año 2003. Cuando dichas limitaciones fueron declaradas contrarias a la Constitución española, el legislador enmendó la ley en 2009 para establecer límites al ejercicio de la jurisdicción universal por razones económicas y diplomáticas y lo hizo de nuevo en 2014, con la intención aparente de impedir directamente el ejercicio de dicha jurisdicción. Esta última reforma, llevada a cabo de manera unilateral y expedita, impuso estrictas condiciones legales a la jurisdicción universal en España y desnaturalizó por completo su ejercicio. La deficiente calidad jurídica de la reforma no solo ha generado tensiones dentro de los tribunales, al impedirles seguir conociendo de la mayoría de los crímenes internacionales que estaban siendo investigados, sino que también ha dado lugar a una preocupante falta de seguridad jurídica de cara a procesos futuros.

  15. Extended phenotype: nematodes turn ants into bird-dispersed fruits

    DEFF Research Database (Denmark)

    Hughes, D P; Kronauer, D J C; Boomsma, J J

    2008-01-01

    A recent study has discovered a novel extended phenotype of a nematode which alters its ant host to resemble ripe fruit. The infected ants are in turn eaten by frugivorous birds that disperse the nematode's eggs.......A recent study has discovered a novel extended phenotype of a nematode which alters its ant host to resemble ripe fruit. The infected ants are in turn eaten by frugivorous birds that disperse the nematode's eggs....

  16. Histrionicotoxin alkaloids finally detected in an ant

    DEFF Research Database (Denmark)

    Jones, Tappey H.; Adams, Rachelle Martha Marie; Spande, Thomas F.

    2012-01-01

    Workers of the ant Carebarella bicolor collected in Panama were found to have two major poison-frog alkaloids, cis- and trans-fused decahydroquinolines (DHQs) of the 269AB type, four minor 269AB isomers, two minor 269B isomers, and three isomers of DHQ 271D. For the first time in an ant, however......) sp., were found to have a very similar DHQ complex but failed to show HTXs. Several new DHQ alkaloids of MW 271 (named in the frog as 271G) are reported from the above ants that have both m/z 202 and 204 as major fragment ions, unlike the spectrum seen for the poison-frog alkaloid 271D, which has...... only an m/z 204 base peak. Found also for the first time in skin extracts from the comparison frog Oophaga granulifera of Costa Rica is a trace DHQ of MW 273. It is coded as 273F in the frog; a different isomer is found in the ant....

  17. Ants, rodents and seed predation in Proteaceae

    African Journals Online (AJOL)

    ... their nests extremely rapidly. One benefit of the ant-plant interaction may be seed escape ... (odourless to humans when dry) household glue or, b) placing seed in a Petri dish ... the layout of exclosures was completed. Response was not as.

  18. The evolution of invasiveness in garden ants

    DEFF Research Database (Denmark)

    Cremer, Sylvia; Ugelvig, Line Vej; Drijfhout, Falko P

    2008-01-01

    It is unclear why some species become successful invaders whilst others fail, and whether invasive success depends on pre-adaptations already present in the native range or on characters evolving de-novo after introduction. Ants are among the worst invasive pests, with Lasius neglectus and its ra...

  19. The ejaculatory biology of leafcutter ants

    DEFF Research Database (Denmark)

    den Boer, Susanne; Stürup, Marlene; Boomsma, Jacobus Jan

    2015-01-01

    understanding of the fundamental biology of ejaculate production, transfer and physiological function remains extremely limited. We studied the ejaculation process in the leafcutter ant Atta colombica and found that it starts with the appearance of a clear pre-ejaculatory fluid (PEF) at the tip...

  20. Mating, hybridisation and introgression in Lasius ants

    NARCIS (Netherlands)

    Have, van der T.M.; Pedersen, J.S.; Boomsma, J.J.

    2011-01-01

    Recent reviews have shown that hybridisation among ant species is likely to be more common than previously appreciated. but that documented cases of introgression remain rare. After molecular phylogenetic work had shown that European Lasius niger (LINNAEUS, 1758) and L. psammophilus SEIFERT, 1992

  1. Ants recognize foes and not friends

    Science.gov (United States)

    Guerrieri, Fernando J.; Nehring, Volker; Jørgensen, Charlotte G.; Nielsen, John; Galizia, C. Giovanni; d'Ettorre, Patrizia

    2009-01-01

    Discriminating among individuals and rejecting non-group members is essential for the evolution and stability of animal societies. Ants are good models for studying recognition mechanisms, because they are typically very efficient in discriminating ‘friends’ (nest-mates) from ‘foes’ (non-nest-mates). Recognition in ants involves multicomponent cues encoded in cuticular hydrocarbon profiles. Here, we tested whether workers of the carpenter ant Camponotus herculeanus use the presence and/or absence of cuticular hydrocarbons to discriminate between nest-mates and non-nest-mates. We supplemented the cuticular profile with synthetic hydrocarbons mixed to liquid food and then assessed behavioural responses using two different bioassays. Our results show that (i) the presence, but not the absence, of an additional hydrocarbon elicited aggression and that (ii) among the three classes of hydrocarbons tested (unbranched, mono-methylated and dimethylated alkanes; for mono-methylated alkanes, we present a new synthetic pathway), only the dimethylated alkane was effective in eliciting aggression. Our results suggest that carpenter ants use a fundamentally different mechanism for nest-mate recognition than previously thought. They do not specifically recognize nest-mates, but rather recognize and reject non-nest-mates bearing odour cues that are novel to their own colony cuticular hydrocarbon profile. This begs for a reappraisal of the mechanisms underlying recognition systems in social insects. PMID:19364750

  2. Recognition of social identity in ants

    DEFF Research Database (Denmark)

    Bos, Nick; d'Ettorre, Patrizia

    2012-01-01

    Recognizing the identity of others, from the individual to the group level, is a hallmark of society. Ants, and other social insects, have evolved advanced societies characterized by efficient social recognition systems. Colony identity is mediated by colony specific signature mixtures, a blend...

  3. Plasmodium parasitaemia among pregnant women attending ante ...

    African Journals Online (AJOL)

    ... Ante-Natal Clinic at Military Hospital Port Harcourt, Rivers State, Nigeria using the Standard parasitological technique. Venous blood was collected from 200 pregnant women, both thick and thin blood films were made on clean greese-free glass slide and stained with 10% Giemsa stains diluted with 7.2 buffered water for ...

  4. Operant conditioning in the ant Myrmica sabuleti.

    Science.gov (United States)

    Cammaerts, M C

    2004-11-30

    Operant conditioning could be obtained in the ant Myrmica sabuleti by presenting to the workers, during a six-day period, an apparatus containing either sugared water or meat as a reward. The conditioning obtained using sugared water as a reward was short lasting. A reconditioning was more persistent and lasted four hours. The ants' response was very precise, since they exhibited it only in front of an apparatus identical to that used during the training phase. Operant conditioning obtained using meat as a reward was more pronounced than that obtained by using sugared water, probably because meat is more valuable as a reward than sugar for the species studied, which is essentially a carnivorous one. Such a conditioning was rather persistent. Indeed, a first operant conditioning obtained by using meat as a reward could still be detected after seven hours, and a reconditioning was still significant after eight hours. One day after this eight-hour period without rewarding the ants, the response was higher again and a further day later, it was still significant. Since the operant conditioning is easy to perform and quantify and since the ants' response is very precise, such a conditioning can be used for further studying M. sabuleti workers' visual perception.

  5. A global database of ant species abundances

    Science.gov (United States)

    Gibb, Heloise; Dunn, Rob R.; Sanders, Nathan J.; Grossman, Blair F.; Photakis, Manoli; Abril, Silvia; Agosti, Donat; Andersen, Alan N.; Angulo, Elena; Armbrecht, Ingre; Arnan, Xavier; Baccaro, Fabricio B.; Bishop, Tom R.; Boulay, Raphael; Bruhl, Carsten; Castracani, Cristina; Cerda, Xim; Del Toro, Israel; Delsinne, Thibaut; Diaz, Mireia; Donoso, David A.; Ellison, Aaron M.; Enriquez, Martha L.; Fayle, Tom M.; Feener Jr., Donald H.; Fisher, Brian L.; Fisher, Robert N.; Fitpatrick, Matthew C.; Gomez, Cristanto; Gotelli, Nicholas J.; Gove, Aaron; Grasso, Donato A.; Groc, Sarah; Guenard, Benoit; Gunawardene, Nihara; Heterick, Brian; Hoffmann, Benjamin; Janda, Milan; Jenkins, Clinton; Kaspari, Michael; Klimes, Petr; Lach, Lori; Laeger, Thomas; Lattke, John; Leponce, Maurice; Lessard, Jean-Philippe; Longino, John; Lucky, Andrea; Luke, Sarah H.; Majer, Jonathan; McGlynn, Terrence P.; Menke, Sean; Mezger, Dirk; Mori, Alessandra; Moses, Jimmy; Munyai, Thinandavha Caswell; Pacheco, Renata; Paknia, Omid; Pearce-Duvet, Jessica; Pfeiffer, Martin; Philpott, Stacy M.; Resasco, Julian; Retana, Javier; Silva, Rogerio R.; Sorger, Magdalena D.; Souza, Jorge; Suarez, Andrew V.; Tista, Melanie; Vasconcelos, Heraldo L.; Vonshak, Merav; Weiser, Michael D.; Yates, Michelle; Parr, Catherine L.

    2017-01-01

    What forces structure ecological assemblages? A key limitation to general insights about assemblage structure is the availability of data that are collected at a small spatial grain (local assemblages) and a large spatial extent (global coverage). Here, we present published and unpublished data from 51,388 ant abundance and occurrence records of more than 2693 species and 7953 morphospecies from local assemblages collected at 4212 locations around the world. Ants were selected because they are diverse and abundant globally, comprise a large fraction of animal biomass in most terrestrial communities, and are key contributors to a range of ecosystem functions. Data were collected between 1949 and 2014, and include, for each geo-referenced sampling site, both the identity of the ants collected and details of sampling design, habitat type and degree of disturbance. The aim of compiling this dataset was to provide comprehensive species abundance data in order to test relationships between assemblage structure and environmental and biogeographic factors. Data were collected using a variety of standardised methods, such as pitfall and Winkler traps, and will be valuable for studies investigating large-scale forces structuring local assemblages. Understanding such relationships is particularly critical under current rates of global change. We encourage authors holding additional data on systematically collected ant assemblages, especially those in dry and cold, and remote areas, to contact us and contribute their data to this growing dataset.

  6. Studies on the environmental implications of ants (Hymenoptera ...

    African Journals Online (AJOL)

    A study of ants associated wh two synanthropcenvironments in Awka was carried out in 2008 using pitfall and bait traps. The study yelded a total of 561 ants wth 409 obtaned from the hemisynanthrophic environment while 192 ants were collected from the endophilic environment. The percentage occurrence, total dstribution ...

  7. Dynamics of an ant-plant-pollinator model

    Science.gov (United States)

    Wang, Yuanshi; DeAngelis, Donald L.; Nathaniel Holland, J.

    2015-03-01

    In this paper, we consider plant-pollinator-ant systems in which plant-pollinator interaction and plant-ant interaction are both mutualistic, but there also exists interference of pollinators by ants. The plant-pollinator interaction can be described by a Beddington-DeAngelis formula, so we extend the formula to characterize plant-pollinator mutualisms, including the interference by ants, and form a plant-pollinator-ant model. Using dynamical systems theory, we show uniform persistence of the model. Moreover, we demonstrate conditions under which boundary equilibria are globally asymptotically stable. The dynamics exhibit mechanisms by which the three species could coexist when ants interfere with pollinators. We define a threshold in ant interference. When ant interference is strong, it can drive plant-pollinator mutualisms to extinction. Furthermore, if the ants depend on pollination mutualism for their persistence, then sufficiently strong ant interference could lead to their own extinction as well. Yet, when ant interference is weak, plant-ant and plant-pollinator mutualisms can promote the persistence of one another.

  8. Ants Orasest ja Anne Lange monograafiast / Jüri Talvet

    Index Scriptorium Estoniae

    Talvet, Jüri, 1945-

    2005-01-01

    Arvustus: Oras, Ants. Luulekool. I, Apoloogia / koostajad Hando Runnel ja Jaak Rähesoo. Tartu : Ilmamaa, 2003 ; Oras, Ants. Luulekool II, Meistriklass. Tartu : Ilmamaa, 2004 ; Lange, Anne. Ants Oras : [kirjandusteadlane, -kriitik ja tõlkija (1900-1982)]. Tartu : Ilmamaa, 2004

  9. Are ant feces nutrients for plants? A metabolomics approach to elucidate the nutritional effects on plants hosting weaver ants

    DEFF Research Database (Denmark)

    Vidkjær, Nanna Hjort; Wollenweber, Bernd; Gislum, René

    2015-01-01

    Weaver ants (genus Oecophylla) are tropical carnivorous ant species living in high numbers in the canopies of trees. The ants excrete copious amounts of fecal matter on leaf surfaces, and these feces may provide nutrients to host trees. This hypothesis is supported by studies of ant......-plant interactions involving other ant species that have demonstrated the transfer of nutrients from ants to plants. In this 7-months study, a GC–MS-based metabolomics approach along with an analysis of total nitrogen and carbon levels was used to study metabolic changes in ant-hosting Coffea arabica plants compared...... with control plants. The results showed elevated levels of total nitrogen, amino acids, fatty acids, caffeine, and secondary metabolites of the phenylpropanoid pathway in leaves from ant-hosting plants. Minor effects were observed for sugars, whereas little or no effect was observed for organic acids, despite...

  10. Plant lock and ant key: pairwise coevolution of an exclusion filter in an ant-plant mutualism.

    Science.gov (United States)

    Brouat, C; Garcia, N; Andary, C; McKey, D

    2001-10-22

    Although observations suggest pairwise coevolution in specific ant-plant symbioses, coevolutionary processes have rarely been demonstrated. We report on, what is to the authors' knowledge, the strongest evidence yet for reciprocal adaptation of morphological characters in a species-specific ant-plant mutualism. The plant character is the prostoma, which is a small unlignified organ at the apex of the domatia in which symbiotic ants excavate an entrance hole. Each myrmecophyte in the genus Leonardoxa has evolved a prostoma with a different shape. By performing precise measurements on the prostomata of three related myrmecophytes, on their specific associated ants and on the entrance holes excavated by symbiotic ants at the prostomata, we showed that correspondence of the plant and ant traits forms a morphological and behavioural filter. We have strong evidence for coevolution between the dimensions and shape of the symbiotic ants and the prostoma in one of the three ant-Leonardoxa associations.

  11. La actuación de enfermería ante las enfermedades infecciosas en la urgencias hospitalarias

    OpenAIRE

    Suárez Domínguez, Sara

    2017-01-01

    [EN] Una enfermedad infecciosa se define como aquella enfermedad producida por microorganismos patógenos como bacterias, hongos, virus o parásitos, la cual puede contagiarse por contacto con animales, insectos o de una persona a otra. A lo largo de este trabajo estudiaremos las Enfermedades Infecciosas Hospitalarias, concretamente en la enfermedad por virus Ébola y en las diferentes actuaciones de enfermería ante la misma. Para ello, se realizará un repaso en la historia y el desarrollo de...

  12. La Enfermera Comunitaria focaliza la resiliencia del escolar ante la violencia para el fomento de la salud escolar y familiar

    OpenAIRE

    Marina Sánchez-Sanabria

    2009-01-01

    La misión educativa institucional es cada vez mas imposible de lograr ante los problemas de violencia intrafamiliar y escolar, situación que es retomada por el grupo de investigación Control de Calidad de los Procesos en Salud para promover el entorno cultural saludable en la promoción de la Resiliencia que incida en la adopción de comportamientos saludables y prósperos. El estudio se realizó en una escuela de la comuna cinco de Valledupar-Colombia. Es una investigación cualitativa etnográfic...

  13. Frecuencia del antígeno y aloanticuerpos del sistema Diego en donantes de sangre.

    Science.gov (United States)

    Góngora, Fernando B; Chiriboga-Ponce, Rosa F

    2018-01-01

    El sistema Diego es un sistema sanguíneo irregular involucrado de manera clínica en casos de enfermedad hemolítica del recién nacido y en reacciones postransfusionales, dentro de este sistema de han identificado a 22 antígenos eritrocitarios de los cuales el par Di a /Di b son los de mayor importancia por su potencial inmunogénico. Determinar la frecuencia del antígeno Di a y la identificación del aloanticuerpo en la población ecuatoriana. Se realizó un muestreo aleatorio simple y se testó mediante aglutinación en tubo la presencia o ausencia del antígeno y en metodología en gel la presencia del aloanticuerpo anti-Di a . se estableció una prevalencia del antígeno Di a del 25% frente a un 6.09% de aloinmunización por dicho antígeno en donantes de sangre ecuatorianos; no existieron diferencias significativas en la asociación de las variables, siendo estas independientes de la edad y procedencia del donante, sin embargo se pudo constatar que en Ecuador existe población portadora del antígeno Diego Di a y casos de aloinmunización por este sistema debidos probablemente a la incompatibilidad transfusional sea esta por vía maternofetal o por transfusiones de sangre. La distribución de la frecuencia de antígenos y aloanticuerpos del sistema Diego es casi uniforme dentro de la población de nuestro país, probablemente por ser un territorio con alto grado de mestizaje, por lo que es de vital importancia la implementación de la detección de este sistema sanguíneo y su inclusión dentro de los protocolos de detección de anticuerpos irregulares en los bancos de sangre de Ecuador. Copyright: © 2018 SecretarÍa de Salud

  14. ¿Los jóvenes leen menos que antes?

    OpenAIRE

    Da Pieve, Enzo

    2016-01-01

    El avance de las tecnologías y la aparición de las redes sociales nos han hecho creer que los jóvenes leen menos que antes, que han dejado de lado la escritura, los libros, las revistas o el periódico y se han entregado al dinamismo y el ocio que propicia internet. No obstante, el uso de internet, principalmente de redes sociales, ha presentado en los jóvenes una posibilidad de lectura y escritura cada vez mayor. Centro de Investigación en Lectura y Escritura (CILE)

  15. Mitigación del colapso de las cubiertas ligeras de fibrocemento ante vientos huracanados

    OpenAIRE

    Estrada Cingualbres, R. A.; Rodríguez Peña, J. C.; Lengarán Ávila, Y.; Campos Mobilla, S.

    2017-01-01

    La región del Caribe, el Golfo de México y el Estrecho de la Florida es una zona de alta vulnerabilidad ante huracanes de altas categorías. Las cubiertas ligeras son los elementos más vulnerables durante la ocurrencia de estos fenómenos, su colapso genera un gran peligro para la vida de los habitantes de estas viviendas, así como un alto impacto económico y social en las mismas y en obras sociales e industriales. El objetivo de esta investigación ha sido la caracterización de las cubiertas li...

  16. Interactive effects of soil-dwelling ants, ant mounds and simulated grazing on local plant community composition

    NARCIS (Netherlands)

    Veen, G.F.; Olff, H.

    2011-01-01

    Interactions between aboveground vertebrate herbivores and subterranean yellow meadow ants (Lasius flavus) can drive plant community patterns in grassland ecosystems. Here, we study the relative importance of the presence of ants (L. flavus) and ant mounds under different simulated grazing regimes

  17. Evaluación de un antígeno purificado para el diagnóstico de toxocariosis

    Directory of Open Access Journals (Sweden)

    Graciela Santillán

    Full Text Available La toxocariosis es una zoonosis causada por la ingestión de huevos infectivos de Toxocara spp. El diagnóstico de la enfermedad se basa en la detección de anticuerpos en el suero u otros fluidos biológicos. La técnica serológica más utilizada es el ELISA, que usa como antígeno los productos de excreción-secreción de larvas de tercer estadio (ES/L3. Estos productos antigénicos son glicoproteínas que se originan en los órganos secretorios del parásito y no son específicos de especie. Para evaluar la especificidad de la técnica de ELISA con el antígeno ES/L3, se emplearon sueros de personas con otras helmintiasis y con patologías no parasitarias. Se observó que estos sueros presentaron reactividad entre el 11 y el 70 % de los casos. El Western blot con suero de los mismos pacientes reveló que la glicoproteína que corresponde al triplete de 120 kDa fue la más inespecífica. Teniendo en cuenta estos resultados y con el propósito de purificar el antígeno se realizó una cromatografía de intercambio iónico. Cuando se analizaron los sueros de los pacientes con diferentes enfermedades parasitarias y no parasitarias con el antígeno ES/L3 purificado, solo fueron reactivos entre un 10 y un 20 % de ellos. La sensibilidad del test de ELISA determinada por el programa Epidat 3. 0 para los dos antígenos fue del 100 %, pero se observaron diferencias en la especificidad: para el antígeno ES/L3 total esta fue del 84 % y para el ES/L3 purificado del 99 %. Empleando el antígeno ES/L3 purificado se puede considerar que los sueros que son reactivos, en presencia de una sintomatología compatible, corresponden a pacientes que fueron o están parasitados con Toxocara canis.

  18. Uso del Instrumento Militar en la Política Antártica – Elementos para el Análisis y su Aplicación en el Caso de Argentina

    OpenAIRE

    Gabriel De Paula

    2009-01-01

    En la mayor parte de los países con intereses en la Antártida, las Fuerzas Armadas (el instrumento militar) realizan funciones logísticas, como el abastecimiento o el movimiento de personal. Incluso, en algunos países, como en Argentina, la campaña antártica es planificada por las Fuerzas Armadas. Por otro lado, en algunos casos, encontramos en la Antártida países donde las Fuerzas Armadas pueden desarrollar, además de la función logística, una función que denominaremos "ocupación efectiva". ...

  19. Edge detection in digital images using Ant Colony Optimization

    Directory of Open Access Journals (Sweden)

    Marjan Kuchaki Rafsanjani

    2015-11-01

    Full Text Available Ant Colony Optimization (ACO is an optimization algorithm inspired by the behavior of real ant colonies to approximate the solutions of difficult optimization problems. In this paper, ACO is introduced to tackle the image edge detection problem. The proposed approach is based on the distribution of ants on an image; ants try to find possible edges by using a state transition function. Experimental results show that the proposed method compared to standard edge detectors is less sensitive to Gaussian noise and gives finer details and thinner edges when compared to earlier ant-based approaches.

  20. Antes y después del Convenio Marco en México: una comparación desde la Encuesta sobre Tabaquismo en Jóvenes 2003 y 2006 Before and after the Framework Convention on Tobacco Control in Mexico: a comparison from the 2003 and 2006 Global Youth Tobacco Survey

    Directory of Open Access Journals (Sweden)

    Raydel Valdés-Salgado

    2007-01-01

    Full Text Available OBJETIVO: Analizar la información de la Encuesta sobre tabaquismo en jóvenes (ETJ sobre consumo de cigarro y otros indicadores propuestos en el Convenio Marco para el Control del Tabaco (CMCT. MATERIAL Y MÉTODOS: La ETJ usa un diseño de muestreo por conglomerado en dos etapas que genera muestras representativas de estudiantes de 12 a 15 años de las escuelas secundarias públicas, privadas y técnicas. Incluye 33,297 estudiantes de 399 escuelas de nueve ciudades. Se obtuvieron prevalencias puntuales y diferencias de proporciones, así como razones de momios ajustadas por edad. RESULTADOS: La prevalencia de fumadores en el mes anterior a la encuesta es de 24.9% (IC 95% 22.5-27.3. El índice de susceptibilidad de iniciarse en el consumo de cigarros es de 28%. Al comparar con la aplicación en 2003, no se observa una disminución del consumo ni de la exposición al humo de tabaco, ni aumento en las tasas de cesación. En los programas escolares se han incrementado significativamente los contenidos de daños a la salud causados por fumar. No se observan avances en cuanto a reducción de la publicidad del tabaco, ni reducción del acceso de los menores al tabaco. Se presentan estimados nacionales y por ciudad. CONCLUSIÓN: Dos años después de ratificado el CMCT todavía no hay avances significativos en las principales áreas abordadas por dicho convenio, especialmente no ha disminuido el consumo de tabaco entre los estudiantes de secundaria.OBJECTIVE: The aim of this paper is to present findings from the GYTS on current cigarette smoking and other tobacco epidemic indicators. MATERIAL AND METHODS: The GYTS uses a two-stage cluster sample survey design that produces representative samples of students aged 12 to 15 years enrolled in public, private and technical schools. The survey was undertaken in 2003 and 2006 at 399 schools in nine cities. The GYTS surveyed 33 297 students. Point prevalence, differences of proportions and adjusted odds ratio

  1. Pacientes, médicos y enfermeros: tres puntos de vista distintos sobre una misma realidad. Actitudes y percepciones ante los derechos de los pacientes Patients, physicians and nurses: three different points of view on the same issue. Attitudes to and perceptions of patient rights

    Directory of Open Access Journals (Sweden)

    Joan Guix Oliver

    2006-12-01

    Full Text Available Objetivos: Analizar las actitudes y las percepciones de pacientes, médicos y enfermeros respecto a los derechos de los pacientes en el ámbito de los hospitales públicos del sector sanitario de Reus (Tarragona. Métodos: Análisis cualitativo, mediante grupos focales de profesionales sanitarios (médicos y enfermeros y usuarios dados de alta, seguido de 3 encuestas dirigidas a cada uno de estos colectivos. Se realizó un análisis descriptivo de los resultados y de las diferencias entre colectivos. Se utilizó el análisis de componentes principales categóricos para reducir el número de dimensiones y revelar las relaciones existentes entre las diversas variables. Resultados: Ex pacientes y enfermeros identifican los «derechos a la información» y «autonomía del paciente» como los más importantes, mientras que para los médicos las 2 dimensiones más importantes son «derecho a la autonomía» y «derecho a la formulación de la opinión del paciente». Una minoría de pacientes es refractaria a la toma de decisiones. Las mujeres, los más jóvenes y los niveles de educación altos son más favorables al respeto a la autonomía del paciente. Hay posiciones menos favorables a las visiones «autonomistas» por parte de los pacientes, en comparación con las visiones más favorables por parte de los médicos y radicalmente partidarias por parte de los enfermeros. Conclusiones: Los derechos de los pacientes no son suficientemente conocidos y el derecho a la información es valorado como más importante que el derecho al ejercicio de la autonomía. Ex pacientes, médicos y enfermeros tienen actitudes y percepciones diferentes frente a situaciones similares.Objectives: To analyze patients', physicians' and nurses' attitudes to and perceptions of patient rights in the public hospitals of the Reus health district in Catalonia (Spain. Methods: We performed a qualitative analysis, through focus groups composed of health professionals (physicians

  2. Una respuesta a Linz desde el presidencialismo

    Directory of Open Access Journals (Sweden)

    Daniela Lucía Vargas Moreno

    2014-07-01

    Full Text Available Este artículo es una reflexión descriptiva de las relaciones e interacciones que se establecen entre los poderes Ejecutivo y Legislativo en el sistema presidencial. Su objetivo principal es responder a la crítica de Juan José Linz hacia el presidencialismo a través del examen de los dos argumentos centrales del autor: la legitimidad democrática dual y la rigidez de los mandatos. A su vez, este escrito incorpora el estudio del sistema electoral, del sistema de partidos y del liderazgo político, y las dinámicas que se generan entre estos elementos debido al tipo de régimen. La conclusión apunta a que no se puede establecer un fracaso rotundo del presidencialismo sin antes considerar distintas variables que han incidido, particularmente, en el escenario latinoamericano.

  3. The Pied Piper: A Parasitic Beetle's Melodies Modulate Ant Behaviours.

    Directory of Open Access Journals (Sweden)

    Andrea Di Giulio

    Full Text Available Ants use various communication channels to regulate their social organisation. The main channel that drives almost all the ants' activities and behaviours is the chemical one, but it is long acknowledged that the acoustic channel also plays an important role. However, very little is known regarding exploitation of the acoustical channel by myrmecophile parasites to infiltrate the ant society. Among social parasites, the ant nest beetles (Paussus are obligate myrmecophiles able to move throughout the colony at will and prey on the ants, surprisingly never eliciting aggression from the colonies. It has been recently postulated that stridulatory organs in Paussus might be evolved as an acoustic mechanism to interact with ants. Here, we survey the role of acoustic signals employed in the Paussus beetle-Pheidole ant system. Ants parasitised by Paussus beetles produce caste-specific stridulations. We found that Paussus can "speak" three different "languages", each similar to sounds produced by different ant castes (workers, soldiers, queen. Playback experiments were used to test how host ants respond to the sounds emitted by Paussus. Our data suggest that, by mimicking the stridulations of the queen, Paussus is able to dupe the workers of its host and to be treated as royalty. This is the first report of acoustic mimicry in a beetle parasite of ants.

  4. The interactions of ants with their biotic environment.

    Science.gov (United States)

    Chomicki, Guillaume; Renner, Susanne S

    2017-03-15

    This s pecial feature results from the symposium 'Ants 2016: ant interactions with their biotic environments' held in Munich in May 2016 and deals with the interactions between ants and other insects, plants, microbes and fungi, studied at micro- and macroevolutionary levels with a wide range of approaches, from field ecology to next-generation sequencing, chemical ecology and molecular genetics. In this paper, we review key aspects of these biotic interactions to provide background information for the papers of this s pecial feature After listing the major types of biotic interactions that ants engage in, we present a brief overview of ant/ant communication, ant/plant interactions, ant/fungus symbioses, and recent insights about ants and their endosymbionts. Using a large molecular clock-dated Formicidae phylogeny, we map the evolutionary origins of different ant clades' interactions with plants, fungi and hemiptera. Ants' biotic interactions provide ideal systems to address fundamental ecological and evolutionary questions about mutualism, coevolution, adaptation and animal communication. © 2017 The Author(s).

  5. Ant species confer different partner benefits on two neotropical myrmecophytes.

    Science.gov (United States)

    Frederickson, Megan E

    2005-04-01

    The dynamics of mutualistic interactions involving more than a single pair of species depend on the relative costs and benefits of interaction among alternative partners. The neotropical myrmecophytes Cordia nodosa and Duroia hirsuta associate with several species of obligately symbiotic ants. I compared the ant partners of Cordia and Duroia with respect to two benefits known to be important in ant-myrmecophyte interactions: protection against herbivores provided by ants, and protection against encroaching vegetation provided by ants. Azteca spp., Myrmelachista schumanni, and Allomerus octoarticulatus demerarae ants all provide the leaves of Cordia and Duroia some protection against herbivores. However, Azteca and Allomerus provide more protection than does Myrmelachista to the leaves of their host plants. Although Allomerus protects the leaves of its hosts, plants occupied by Allomerus suffer more attacks by herbivores to their stems than do plants occupied by other ants. Relative to Azteca or Allomerus, Myrmelachista ants provide better protection against encroaching vegetation, increasing canopy openness over their host plants. These differences in benefits among the ant partners of Cordia and Duroia are reflected in the effect of each ant species on host plant size, growth rate, and reproduction. The results of this study show how mutualistic ant partners can differ with respect to both the magnitude and type of benefits they provide to the same species of myrmecophytic host.

  6. Knowledge, practices and attitudes toward volunteer work in an influenza pandemic: cross-sectional study with Peruvian medical students

    OpenAIRE

    10.5867/medwave.2015.04.6136; Julio Maquera-Afaray; Patricia J. García; César Cárcamo

    2015-01-01

    INTRODUCCIÓN La reducción crítica en el personal de salud ante situaciones de desastre o epidemia como una pandemia de influenza podría requerir la necesidad de incluir estudiantes voluntarios. OBJETIVO El objetivo del artículo es determinar los conocimientos y prácticas sobre influenza pandémica y la actitud hacia el voluntariado en estudiantes de medicina peruanos. MÉTODOS Estudio transversal analítico por muestreo simple utilizando una encuesta. RESULTADOS De los 8...

  7. Fast and flexible: argentine ants recruit from nearby trails.

    Directory of Open Access Journals (Sweden)

    Tatiana P Flanagan

    Full Text Available Argentine ants (Linepithema humile live in groups of nests connected by trails to each other and to stable food sources. In a field study, we investigated whether some ants recruit directly from established, persistent trails to food sources, thus accelerating food collection. Our results indicate that Argentine ants recruit nestmates to food directly from persistent trails, and that the exponential increase in the arrival rate of ants at baits is faster than would be possible if recruited ants traveled from distant nests. Once ants find a new food source, they walk back and forth between the bait and sometimes share food by trophallaxis with nestmates on the trail. Recruiting ants from nearby persistent trails creates a dynamic circuit, like those found in other distributed systems, which facilitates a quick response to changes in available resources.

  8. Host ant independent oviposition in the parasitic butterfly Maculinea alcon

    DEFF Research Database (Denmark)

    Fürst, Matthias A; Nash, David Richard

    2010-01-01

    to host-ant nests and non-host-ant nests, and the number and position of eggs attached were assessed. Our results show no evidence for host-ant-based oviposition in M. alcon, but support an oviposition strategy based on plant characteristics. This suggests that careful management of host-ant distribution......Parasitic Maculinea alcon butterflies can only develop in nests of a subset of available Myrmica ant species, so female butterflies have been hypothesized to preferentially lay eggs on plants close to colonies of the correct host ants. Previous correlational investigations of host......-ant-dependent oviposition in this and other Maculinea species have, however, shown equivocal results, leading to a long-term controversy over support for this hypothesis. We therefore conducted a controlled field experiment to study the egg-laying behaviour of M. alcon. Matched potted Gentiana plants were set out close...

  9. Exploring with PAM: Prospecting ANTS Missions for Solar System Surveys

    Science.gov (United States)

    Clark, P. E.; Rilee, M. L.; Curtis, S. A.

    2003-01-01

    ANTS (Autonomous Nano-Technology Swarm), a large (1000 member) swarm of nano to picoclass (10 to 1 kg) totally autonomous spacecraft, are being developed as a NASA advanced mission concept. ANTS, based on a hierarchical insect social order, use an evolvable, self-similar, hierarchical neural system in which individual spacecraft represent the highest level nodes. ANTS uses swarm intelligence attained through collective, cooperative interactions of the nodes at all levels of the system. At the highest levels this can take the form of cooperative, collective behavior among the individual spacecraft in a very large constellation. The ANTS neural architecture is designed for totally autonomous operation of complex systems including spacecraft constellations. The ANTS (Autonomous Nano Technology Swarm) concept has a number of possible applications. A version of ANTS designed for surveying and determining the resource potential of the asteroid belt, called PAM (Prospecting ANTS Mission), is examined here.

  10. Fast and flexible: argentine ants recruit from nearby trails.

    Science.gov (United States)

    Flanagan, Tatiana P; Pinter-Wollman, Noa M; Moses, Melanie E; Gordon, Deborah M

    2013-01-01

    Argentine ants (Linepithema humile) live in groups of nests connected by trails to each other and to stable food sources. In a field study, we investigated whether some ants recruit directly from established, persistent trails to food sources, thus accelerating food collection. Our results indicate that Argentine ants recruit nestmates to food directly from persistent trails, and that the exponential increase in the arrival rate of ants at baits is faster than would be possible if recruited ants traveled from distant nests. Once ants find a new food source, they walk back and forth between the bait and sometimes share food by trophallaxis with nestmates on the trail. Recruiting ants from nearby persistent trails creates a dynamic circuit, like those found in other distributed systems, which facilitates a quick response to changes in available resources.

  11. El desarrollo de las competencias emocionales como medio para promover la conciencia crítica ante los medios de comunicación

    OpenAIRE

    Carreño Gutiez, Laura

    2010-01-01

    Esta comunicación presenta una revisión de las teorías cognitivas sobre emociones e Inteligencia emocional. Los estudios señalan la existencia de metahabilidades que pueden ser categorizadas en cinco competencias o dimensiones emocionales. Cada una de ellas, se puede trabajar por separado en el aula mediante el uso de los medios de comunicación. Formar al alumnado en educación emocional facilitará una conciencia crítica ante los medios de comunicación. Se aportan varias propuestas para que lo...

  12. Using pleometrosis (multiple queens) and pupae transplantation to boost weaver ant (Oecophylla smaragdina) colony growth in ant nurseries

    DEFF Research Database (Denmark)

    Offenberg, Hans Joachim; Nielsen, Mogens Gissel; Peng, Renkang

    2011-01-01

    Weaver ants (Oecophylla spp.) are increasingly being used for biocontrol and are targeted for future production of insect protein in ant farms. An efficient production of live ant colonies may facilitate the utilization of these ants but the production of mature colonies is hampered by the long...... and no transplantation. Thus, in ant nurseries the use of multiple queens during nest founding as well as transplantation of pupae from foreign colonies may be utilised to decrease the time it takes to produce a colony ready for implementation....

  13. Optic disc detection using ant colony optimization

    Science.gov (United States)

    Dias, Marcy A.; Monteiro, Fernando C.

    2012-09-01

    The retinal fundus images are used in the treatment and diagnosis of several eye diseases, such as diabetic retinopathy and glaucoma. This paper proposes a new method to detect the optic disc (OD) automatically, due to the fact that the knowledge of the OD location is essential to the automatic analysis of retinal images. Ant Colony Optimization (ACO) is an optimization algorithm inspired by the foraging behaviour of some ant species that has been applied in image processing for edge detection. Recently, the ACO was used in fundus images to detect edges, and therefore, to segment the OD and other anatomical retinal structures. We present an algorithm for the detection of OD in the retina which takes advantage of the Gabor wavelet transform, entropy and ACO algorithm. Forty images of the retina from DRIVE database were used to evaluate the performance of our method.

  14. Influencia familiar sobre las actitudes ante el consumo de drogas en adolescentes españoles

    Directory of Open Access Journals (Sweden)

    María de la Villa Moral Jiménez

    2013-08-01

    Full Text Available En la cultura mediterránea la familia sigue siendo la agencia socializadora por excelencia, a pesar de diversos cambios referenciales y en la intensidad de los afectos, así como en los estilos disciplinares característicos de nuevas tipologías de familias postmodernas. La influencia y modelado familiar sobre las actitudes ante el consumo de sustancias psicoactivas en adolescentes está bien establecida en indicadores tales como experiencias paternas con las drogas, apego y supervisión parental, clima afectivo, dinámica sociofamiliar, etc. Nuestro objeto de estudio se centra en el análisis psicosocial de tales indicadores, así como en ofrecer un análisis diferencial de la valoración de la relación paterno-filial en relación con las actitudes ante el consumo de drogas en un colectivo de adolescentes españoles. Se ha confirmado una mayor permisividad actitudinal y menor concienciación ante los efectos dañinos de las drogas en los hijos de padres consumidores de sustancias psicoactivas tanto legales como ilegales. Se confirma la importancia psicosocial del Apoyo más valorado por los adolescentes que no consumen drogas, así como la percepción diferencial del empleo del Castigo-Coerción y de la Reprobación en adolescentes consumidores que presentan niveles de mayor permisividad actitudinal.

  15. LA UNIVERSIDAD ANTE LOS NUEVOS PARADIGMAS DE LA INFORMACIÓN Y EL CONOCIMIENTO (PIC

    Directory of Open Access Journals (Sweden)

    Edgar Chirinos

    2009-07-01

    las universidades, su gerencia y sus actores principales (docentes y estudiantes ante el surgimiento de nuevos paradigmas de la información y el conocimiento (PIC causados por la aprehensión de las tecnologías de información y comunicación (TIC. Se tomó como base la definición de la universidad del siglo XXI bajo la dimensión tecnológica de una sociedad sustentada en el conocimiento, cuyo pilar fundamental está integrado por las plataformas tecnológicas, las telecomunicaciones y redes del conocimiento. Se concluye que una de las brechas en el propósito de democratización y acceso social al conocimiento.

  16. Vivir, escribir, enfermar. Sobre exilio y enfermedad en Antes que anochezca de Reynaldo Arenas

    Directory of Open Access Journals (Sweden)

    Denise León

    2015-12-01

    Full Text Available En su ensayo sobre literatura y enfermedad, Roberto Bolaño construye una tríada íntima de experiencia que nos guía a través de las motivaciones fundamentales que hay detrás de toda poesía y que está constituida ciertamente por los viajes, el sexo y los libros. Me propongo indagar en el presente trabajo cómo funciona esta tríada en la obra del cubano Reynaldo Arenas, especialmente en su autobiografía, Antes que anochezca, donde la enfermedad re direcciona la trayectoria del viaje. Si la fuga funciona como una constante que tensiona la obra y la vida de Arenas, en su autobiografía exilio y enfermedad se fusionan como signos intercambiables.

  17. A global database of ant species abundances

    Czech Academy of Sciences Publication Activity Database

    Gibb, H.; Dunn, R. R.; Sanders, N. J.; Grossman, B. F.; Photakis, M.; Abril, S.; Agosti, D.; Andersen, A. N.; Angulo, E.; Armbrecht, I.; Arnan, X.; Baccaro, F. B.; Bishop, T. R.; Boulay, R.; Brühl, C.; Castracani, C.; Cerdá, X.; Del Toro, I.; Delsinne, T.; Diaz, M.; Donoso, D. A.; Ellison, A. M.; Enríquez, M. L.; Fayle, Tom Maurice; Feener, D. H.; Fisher, B. L.; Fisher, R. N.; Fitzpatrick, M. C.; Gómez, C.; Gotelli, N. J.; Gove, A.; Grasso, D. A.; Groc, S.; Guenard, B.; Gunawardene, N.; Heterick, B.; Hoffmann, B.; Janda, Milan; Jenkins, C.; Kaspari, M.; Klimeš, Petr; Lach, L.; Laeger, T.; Lattke, J.; Leponce, M.; Lessard, J.-P.; Longino, J.; Lucky, A.; Luke, S. H.; Majer, J.; McGlynn, T. P.; Menke, S.; Mezger, D.; Mori, A.; Moses, Jimmy; Munyai, T. C.; Pacheco, R.; Paknia, O.; Pearce-Duvet, J.; Pfeiffer, M.; Philpott, S. M.; Resasco, J.; Retana, J.; Silva, R. R.; Sorger, M. D.; Souza, J.; Suarez, A.; Tista, M.; Vasconcelos, H. L.; Vonshak, M.; Weisser, M. D.; Yates, M.; Parr, C. L.

    2017-01-01

    Roč. 98, č. 3 (2017), s. 883-884 ISSN 0012-9658 R&D Projects: GA ČR GB14-36098G; GA ČR GAP505/12/2467; GA ČR GPP505/12/P875 Institutional support: RVO:60077344 Keywords : abundance * ants * database Subject RIV: EH - Ecology, Behaviour OBOR OECD: Ecology Impact factor: 4.809, year: 2016 http://onlinelibrary.wiley.com/doi/10.1002/ecy.1682/abstract

  18. Public goods dilemma in asexual ant societies

    OpenAIRE

    Dobata, Shigeto; Tsuji, Kazuki

    2013-01-01

    This study reports experimental evidence for the “public goods dilemma” between cooperators and cheaters in an asexual ant society, in which cheating is always more rewarding for individuals but cooperation at the cost of individual fitness leads to better performance of groups. Although this dilemma provides the basic principle of social evolution, its experimental demonstration with underlying genetics and fitness evaluation for both cooperators and cheaters still lacks in societies other t...

  19. Ant colony optimization and constraint programming

    CERN Document Server

    Solnon, Christine

    2013-01-01

    Ant colony optimization is a metaheuristic which has been successfully applied to a wide range of combinatorial optimization problems. The author describes this metaheuristic and studies its efficiency for solving some hard combinatorial problems, with a specific focus on constraint programming. The text is organized into three parts. The first part introduces constraint programming, which provides high level features to declaratively model problems by means of constraints. It describes the main existing approaches for solving constraint satisfaction problems, including complete tree search

  20. Precision Rescue Behavior in North American Ants

    Directory of Open Access Journals (Sweden)

    Katherine Taylor

    2013-07-01

    Full Text Available Altruistic behavior, in which one individual provides aid to another at some cost to itself, is well documented. However, some species engage in a form of altruism, called rescue, that places the altruist in immediate danger. Here we investigate one such example, namely rescuing victims captured by predators. In a field experiment with two North American ant species, Tetramorium sp. E and Prenolepis imparis, individuals were held in artificial snares simulating capture. T. sp. E, but not P. imparis, exhibited digging, pulling, and snare biting, the latter precisely targeted to the object binding the victim. These results are the first to document precision rescue in a North American ant species; moreover, unlike rescue in other ants, T. sp. E rescues conspecifics from different colonies, mirroring their atypical social behavior, namely the lack of aggression between non-nestmate (heterocolonial conspecifics. In a second, observational study designed to demonstrate rescue from an actual predator, T. sp. E victims were dropped into an antlion's pit and the behavior of a single rescuer was observed. Results showed that T. sp. E not only attempted to release the victim, but also risked attacking the predator, suggesting that precision rescue may play an important role in this species' antipredator behavior.

  1. El periodista, ante la espiral de silencio

    Directory of Open Access Journals (Sweden)

    Dr. Fermín Galindo Arranz

    1998-01-01

    Full Text Available La percepción de la profesión periodística y de su influencia cambia mucho a lo largo del tiempo, de las coyunturas históricas y de los diferentes países y sociedades en los que desempeñan su labor. En un contexto mundial, la gravedad de las situaciones de riesgo periodístico se encuadran en situaciones políticas, económicas o sociales también conflictivas; es entonces cuando se suele reproducir con facilidad en la opinión pública el fenómeno de la espiral del silencio, ante el que inevitablemente se sitúa el periodista. Por definición, el trabajo del periodista consiste en ser portavoz de las novedades que se producen, en dar informaciones y emitir opiniones en la esfera pública, se tiene que situar, por tanto, de forma individual y notoriamente pública ante los fenómenos de espiral de silencio que puedan producirse en la opinión pública. Antonio Tabucchi nos presenta en su novela "Sostiene Pereira" un ejemplo magnífico del dilema del periodista ante este tipo de situaciones.

  2. Recognition of social identity in ants

    Directory of Open Access Journals (Sweden)

    Nick eBos

    2012-03-01

    Full Text Available Recognizing the identity of others, from the individual to the group level, is a hallmark of society. Ants, and other social insects, have evolved advanced societies characterized by efficient social recognition systems. Colony identity is mediated by colony specific signature mixtures, a blend of hydrocarbons present on the cuticle of every individual (the label. Recognition occurs when an ant encounters another individual, and compares the label it perceives to an internal representation of its own colony odor (the template. A mismatch between label and template leads to rejection of the encountered individual. Although advances have been made in our understanding of how the label is produced and acquired, contradictory evidence exists about information processing of recognition cues. Here, we review the literature on template acquisition in ants and address how and when the template is formed, where in the nervous system it is localized, and the possible role of learning. We combine seemingly contradictory evidence in to a novel, parsimonious theory for the information processing of nestmate recognition cues.

  3. Turismo en la Antártida: precisiones conceptuales, principios generales y perspectivas teóricas

    Directory of Open Access Journals (Sweden)

    Pardo Abad, Carlos J.

    2016-06-01

    Full Text Available For half a century Antarctic tourism has turned from being an elitist activity to become an economic sector that attracts a growing number of travelers. At present, the current human presence on the Antarctic continent brings about a dichotomy; on the one hand, nature tourists cruises, which may or may not land in Antarctica; on the other hand, scientific missions (another example of tourists, that in many cases maintain a continuous presence throughout the year. In this paper we examine this unique aspect, relating to international legislative regulation, reviewing theoretical approaches contributed by different authors, characterizing the problems arising from tourism and ecological impact of specifying the recent trends of Antarctic tourism from a geographical perspective.Desde hace medio siglo el turismo antártico ha pasado de ser una actividad elitista a un sector económico que moviliza a un número creciente de viajeros. En la actualidad, la presencia humana en el continente antártico se caracteriza por su dicotomía; por un lado, los turistas de naturaleza y de crucero, que pueden o no tomar tierra al llegar a la Antártida; por otro, los turistas científicos, que son los únicos que en algunos casos pueden mantener una presencia continuada durante todo el año. En este estudio se reflexiona sobre este aspecto singular, relacionándolo con la regulación legislativa internacional, revisando los enfoques teóricos aportados por diferentes autores, caracterizando los problemas derivados del impacto ecológico del turismo y precisando las tendencias recientes del turismo antártico desde una perspectiva geográfica.

  4. The invasive ant, Solenopsis invicta, reduces herpetofauna richness and abundance

    Science.gov (United States)

    Allen, Craig R.; Birge, Hannah E.; Slater, J.; Wiggers, E.

    2017-01-01

    Amphibians and reptiles are declining globally. One potential cause of this decline includes impacts resulting from co-occurrence with non-native red imported fire ant, Solenopsis invicta. Although a growing body of anecdotal and observational evidence from laboratory experiments supports this hypothesis, there remains a lack of field scale manipulations testing the effect of fire ants on reptile and amphibian communities. We addressed this gap by measuring reptile and amphibian (“herpetofauna”) community response to successful fire ant reductions over the course of 2 years following hydramethylnon application to five 100–200 ha plots in southeastern coastal South Carolina. By assessing changes in relative abundance and species richness of herpetofauna in response to fire ant reductions, we were able to assess whether some species were particularly vulnerable to fire ant presence, and whether this sensitivity manifested at the community level. We found that herpetofauna abundance and species richness responded positively to fire ant reductions. Our results document that even moderate populations of red imported fire ants decrease both the abundance and diversity of herpetofauna. Given global herpetofauna population declines and continued spread of fire ants, there is urgency to understand the impacts of fire ants beyond anecdotal and singles species studies. Our results provides the first community level investigation addressing these dynamics, by manipulating fire ant abundance to reveal a response in herpetofauna species abundance and richness.

  5. Predaceous ants, beach replenishment, and nest placement by sea turtles.

    Science.gov (United States)

    Wetterer, James K; Wood, Lawrence D; Johnson, Chris; Krahe, Holly; Fitchett, Stephanie

    2007-10-01

    Ants known for attacking and killing hatchling birds and reptiles include the red imported fire ant (Solenopsis invicta Buren), tropical fire ant [Solenopsis geminata (Fabr.)], and little fire ant [Wasmannia auropunctata (Roger)]. We tested whether sea turtle nest placement influenced exposure to predaceous ants. In 2000 and 2001, we surveyed ants along a Florida beach where green turtles (Chelonia mydas L.), leatherbacks (Dermochelys coriacea Vandelli), and loggerheads (Caretta caretta L.) nest. Part of the beach was artificially replenished between our two surveys. As a result, mean beach width experienced by nesting turtles differed greatly between the two nesting seasons. We surveyed 1,548 sea turtle nests (2000: 909 nests; 2001: 639 nests) and found 22 ant species. S. invicta was by far the most common species (on 431 nests); S. geminata and W. auropunctata were uncommon (on 3 and 16 nests, respectively). In 2000, 62.5% of nests had ants present (35.9% with S. invicta), but in 2001, only 30.5% of the nests had ants present (16.4% with S. invicta). Turtle nests closer to dune vegetation had significantly greater exposure to ants. Differences in ant presence on turtle nests between years and among turtle species were closely related to differences in nest placement relative to dune vegetation. Beach replenishment significantly lowered exposure of nests to ants because on the wider beaches turtles nested farther from the dune vegetation. Selective pressures on nesting sea turtles are altered both by the presence of predaceous ants and the practice of beach replenishment.

  6. Chemically armed mercenary ants protect fungus-farming societies

    Science.gov (United States)

    Adams, Rachelle M. M.; Liberti, Joanito; Illum, Anders A.; Jones, Tappey H.; Nash, David R.; Boomsma, Jacobus J.

    2013-01-01

    The ants are extraordinary in having evolved many lineages that exploit closely related ant societies as social parasites, but social parasitism by distantly related ants is rare. Here we document the interaction dynamics among a Sericomyrmex fungus-growing ant host, a permanently associated parasitic guest ant of the genus Megalomyrmex, and a raiding agro-predator of the genus Gnamptogenys. We show experimentally that the guest ants protect their host colonies against agro-predator raids using alkaloid venom that is much more potent than the biting defenses of the host ants. Relatively few guest ants are sufficient to kill raiders that invariably exterminate host nests without a cohabiting guest ant colony. We also show that the odor of guest ants discourages raider scouts from recruiting nestmates to host colonies. Our results imply that Sericomyrmex fungus-growers obtain a net benefit from their costly guest ants behaving as a functional soldier caste to meet lethal threats from agro-predator raiders. The fundamentally different life histories of the agro-predators and guest ants appear to facilitate their coexistence in a negative frequency-dependent manner. Because a guest ant colony is committed for life to a single host colony, the guests would harm their own interests by not defending the host that they continue to exploit. This conditional mutualism is analogous to chronic sickle cell anemia enhancing the resistance to malaria and to episodes in human history when mercenary city defenders offered either net benefits or imposed net costs, depending on the level of threat from invading armies. PMID:24019482

  7. Chemically armed mercenary ants protect fungus-farming societies.

    Science.gov (United States)

    Adams, Rachelle M M; Liberti, Joanito; Illum, Anders A; Jones, Tappey H; Nash, David R; Boomsma, Jacobus J

    2013-09-24

    The ants are extraordinary in having evolved many lineages that exploit closely related ant societies as social parasites, but social parasitism by distantly related ants is rare. Here we document the interaction dynamics among a Sericomyrmex fungus-growing ant host, a permanently associated parasitic guest ant of the genus Megalomyrmex, and a raiding agro-predator of the genus Gnamptogenys. We show experimentally that the guest ants protect their host colonies against agro-predator raids using alkaloid venom that is much more potent than the biting defenses of the host ants. Relatively few guest ants are sufficient to kill raiders that invariably exterminate host nests without a cohabiting guest ant colony. We also show that the odor of guest ants discourages raider scouts from recruiting nestmates to host colonies. Our results imply that Sericomyrmex fungus-growers obtain a net benefit from their costly guest ants behaving as a functional soldier caste to meet lethal threats from agro-predator raiders. The fundamentally different life histories of the agro-predators and guest ants appear to facilitate their coexistence in a negative frequency-dependent manner. Because a guest ant colony is committed for life to a single host colony, the guests would harm their own interests by not defending the host that they continue to exploit. This conditional mutualism is analogous to chronic sickle cell anemia enhancing the resistance to malaria and to episodes in human history when mercenary city defenders offered either net benefits or imposed net costs, depending on the level of threat from invading armies.

  8. When invasive ants meet: effects of outbreeding on queen performance in the tramp ant Cardiocondyla itsukii.

    Science.gov (United States)

    Heinze, Jürgen; Frohschammer, Sabine; Bernadou, Abel

    2017-08-18

    Most disturbed habitats in the tropics and subtropics harbor numerous species of invasive ants, and occasionally the same species has been introduced repeatedly from multiple geographical sources. We examined how experimental crossbreeding between sexuals from different populations affects the fitness of queens of the tramp ant Cardiocondyla itsukii, which is widely distributed in Asia and the Pacific Islands. Eggs laid by queens that mated with nestmate males had a higher hatching rate than eggs laid by queens mated to males from neighboring (Hawaii × Kauai) or distant introduced populations (Hawaii/Kauai × Okinawa). Furthermore, inbreeding queens had a longer lifespan and produced a less female-biased offspring sex ratio than queens from allopatric mating. This suggests that the genetic divergence between different source populations may already be so large that in case of multiple invasions eventual crossbreeding might negatively affect the fitness of tramp ants. © 2017 Institute of Zoology, Chinese Academy of Sciences.

  9. Juan Pablo II: Portador de Esperanza ante el Dolor y el Sufrimiento

    Directory of Open Access Journals (Sweden)

    Carlos Alberto Rosas Jiménez

    2015-01-01

    Full Text Available El Santo Papa Juan Pablo II centrado en la pregunta por el hombre y la defensa de su dignidad, se preocupó por dejar una sólida y significativa enseñanza sobre esta realidad del ser humano. Padeció el dolor y el sufrimiento en muchos momentos de su vida y, como filósofo, teólogo y Pastor, manifestó esta gran preocupación en casi todas sus encíclicas, en las que buscó transmitir, a lo largo de todo su pontificado, la fe de la Iglesia Católica recogiendo las enseñanzas de la Sagrada Escritura y la Sagrada Tradición. A través de una revisión de las encíclicas que escribió, ilustramos cómo el Santo Padre evidencia, ante todo, un profundo interés de que el hombre de hoy se entienda principalmente a sí mismo y de esta manera, comprenda el dinamismo del dolor, para que, antes que desesperar en los momentos difíciles, viva la esperanza y pueda así llenar de sentido su vida entera

  10. Actitudes ante los impuestos en Roma : aceptación, resignación y rechazo

    Directory of Open Access Journals (Sweden)

    Carlos Jordán Reyes

    2007-01-01

    Full Text Available Las actitudes de los contribuyentes romanos ante los impuestos no fue siempre la misma. Variaron en función de la naturaleza de cada tributo, de los procedimientos recaudatorios de cada momento y lugar y de las circunstancias personales del contribuyente. El tributo en cuanto tal no siempre generó rechazo. A veces fue asumido como una contrapartida lógica del derecho de ciudadanía y a veces incluso era autoimpuesto voluntariamente. A su vez, el rechazo a los tributos se manifestaba de muy diversos modos —la evasión fiscal, la búsqueda del privilegio, la protesta colectiva y el recurso ante la autoridad judicial— cada uno con una gran variedad de matices.The attitudes of Roman contributors towards taxes were not always the same. They differed depending on the nature of each tax, on the tax collection procedures, on the moment and place and the personal circunstances of tax contributors. Taxes as such were not always rejected. Sometimes they were seen as a logical counterpart of the right to citizenship and some other times they were voluntarily self-imposed. At the same time, the rejection of taxes was shown in many different ways: tax evasion, the search for privilege, collective protest, and the appeal to the judicial authorities; all of these including in turn a great variety of forms.

  11. ¿...y antes de los MOOC?

    OpenAIRE

    Lorenzo García Aretio

    2015-01-01

    El fenómeno MOOC (Massive Open Online Courses) ha sobrepasado el interés del mundo académico para instalarse en la sociedad como un argumento democratizador de la educación. Pero los MOOC no han surgido por generación espontánea, como pudiera deducirse de tanta literatura vertida en estos tres últimos años. Para probar que los MOOC han supuesto, no una ruptura, sino una evolución de la educación a distancia, realizamos una revisión de la literatura más relevante que viene a marcar los hitos d...

  12. Food source quality and ant dominance hierarchy influence the outcomes of ant-plant interactions in an arid environment

    Science.gov (United States)

    Flores-Flores, Rocío Vianey; Aguirre, Armando; Anjos, Diego V.; Neves, Frederico S.; Campos, Ricardo I.; Dáttilo, Wesley

    2018-02-01

    In this study, we conducted a series of experiments in a population of Vachellia constricta (Fabaceae) in the arid Tehuacan-Cuicatláan valley, Mexico, in order to evaluate if the food source quality and ant dominance hierarchy influence the outcomes of ant-plant interactions. Using an experiment with artificial nectaries, we observed that ants foraging on food sources with higher concentration of sugar are quicker in finding and attacking potential herbivorous insects. More specifically, we found that the same ant species may increase their defence effectiveness according to the quality of food available. These findings indicate that ant effectiveness in plant protection is context-dependent and may vary according to specific individual characteristics of plants. In addition, we showed that competitively superior ant species tend to dominate plants in periods with high nectar activity, emphasizing the role of the dominance hierarchy structuring ant-plant interactions. However, when high sugar food sources were experimentally available ad libitum, the nocturnal and competitively superior ant species, Camponotus atriceps, did not dominate the artificial nectaries during the day possibly due to limitation of its thermal tolerance. Therefore, temporal niche partitioning may be allowing the coexistence of two dominant ant species (Camponotus rubritorax during the day and C. atriceps at night) on V. constricta. Our findings indicate that the quality of the food source, and temporal shifts in ant dominance are key factors which structure the biotic plant defences in an arid environment.

  13. Las pruebas intradérmicas de evaluación de competencia celular Estudio comparativo entre antígenos clásicos y otros antígenos

    Directory of Open Access Journals (Sweden)

    Miguel Guzmán

    1982-12-01

    Full Text Available Se presenta un estudio comparativo en la respuesta de hipersensibilidad demorada frente a 4 antígenos universalmente recomendados. Tuberculina (TU. Candidina (CA, Streptokinasa/Streptodornasa (SK/SD y virus de Parotiditis (PA con otros antígenos de uso menos común tal como Antígeno-Respiratorio-Mixto (ARM y lisado de Staphylococcus aureus 80/81 (LS. De igual manera se estudió la respuesta al Dinitroclorobenceno (DNCB. La población probada fue de 49 personas normales con edades entre 18-23 años. Los resultados mostraron que la reactividad para ARM es de 91,8%, para LS 91.8%. para Candidina 75%. para TU (10U 24.4%. pare SK/SD de solo 6.8% y para Parotiditis 6,1%. Los estudios con DNCB permiten aconsejar su uso solo en casos muy especiales. El trabajo presentado sugiere una normalización en la lectura y el uso de 4 antígenos con la más alta frecuencia de positividad dentro del grupo probado así: ARM, LS, CA, y TU.

  14. Una Política Nacional de Ciudades Justas y Sustentables. / National Policy for Fair and Sustainable Cities

    Directory of Open Access Journals (Sweden)

    Patricio Hales Dib

    2013-06-01

    Full Text Available Ponencia ante la Comisión Asesora Presidencial para una Política Nacional de Desarrollo Urbano(Chile, conteniendo Principios y Directrices de Acción para una “Política Nacional de Ciudades Justas y Sustentables”./Presentation to the Presidential Advisory Committee for a National Urban Development Policy (Chile, containing Principles and Guidelines for Action for a "National Policy Fair andSustainable Cities".

  15. Just follow your nose: homing by olfactory cues in ants.

    Science.gov (United States)

    Steck, Kathrin

    2012-04-01

    How is an ant-equipped with a brain that barely exceeds the size of a pinhead-capable of achieving navigational marvels? Even though evidences suggest that navigation is a multimodal process, ants heavily depend on olfactory cues-of pheromonal and non-pheromonal nature-for foraging and orientation. Recent studies have directed their attention to the efficiency of pheromone trail networks. Advances in neurophysiological techniques make it possible to investigate trail pheromone processing in the ant's brain. In addition to relying on pheromone odours, ants also make use of volatiles emanating from the nest surroundings. Deposited in the vicinity of the nest, these home-range markings help the ants to home after a foraging run. Furthermore, olfactory landmarks associated with the nest enhance ants' homing abilities. Copyright © 2011 Elsevier Ltd. All rights reserved.

  16. Ant tending influences soldier production in a social aphid.

    Science.gov (United States)

    Shingleton, A W; Foster, W A

    2000-09-22

    The aphid Pseudoregma sundanica (Van der Goot) (Homoptera: Aphididae) has two defence strategies. It is obligatorily tended by various species of ant and also produces sterile soldiers. We investigated how they allocate their investment in these two strategies. We measured the size, number of soldiers, number and species of tending ant, and number and species of predators in P. sundanica populations. We found that the level of ant tending correlated negatively with soldier investment in P. sundanica. The species of tending ant also influenced soldier investment. We excluded ants from aphid populations and recorded changes in population size and structure over four weeks. Ant exclusion led to population decline and extinction. At the same time, surviving populations showed a significant increase in soldier investment. The data demonstrate that social aphids can adjust their investment in soldiers in direct response to environmental change.

  17. Consuming fire ants reduces northern bobwhite survival and weight gain

    Science.gov (United States)

    Myers, P.E.; Allen, Craig R.; Birge, Hannah E.

    2014-01-01

    Northern bobwhite quail, Colinus virginianus (L.) (Galliformes: Odontophoridae), population declines are well documented, but pinpointing the reasons for these decreases has proven elusive. Bobwhite population declines are attributed primarily to loss of habitat and land use changes. This, however, does not entirely explain population declines in areas intensively managed for bobwhites. Although previous research demonstrates the negative impact of red imported fire ant (Solenopsis invicta Buren) (Hymenoptera: Formicidae) on northern bobwhites, the mechanisms underlying this effect are largely unknown. To meet the protein demands of early growth and development, bobwhite chicks predominantly consume small insects, of which ants are a substantial proportion. Fire ants alter ant community dynamics by often reducing native ant diversity and abundance while concurrently increasing the abundance of individuals. Fire ants have negative effects on chicks, but they are also a large potential protein source, making it difficult to disentangle their net effect on bobwhite chicks. To help investigate these effects, we conducted a laboratory experiment to understand (1) whether or not bobwhites consume fire ants, and (2) how the benefits of this consumption compare to the deleterious impacts of bobwhite chick exposure to fire ants. Sixty bobwhite chicks were separated into two groups of 30; one group was provided with starter feed only and the second group was provided with feed and fire ants. Bobwhite chicks were observed feeding on fire ants. Chicks that fed on fire ants had reduced survival and weight gain. Our results show that, while fire ants increase potential food sources for northern bobwhite, their net effect on bobwhite chicks is deleterious. This information will help inform land managers and commercial bobwhite rearing operations.

  18. Cercomacra and related antbirds (Aves, Formicariidae as army ant followers

    Directory of Open Access Journals (Sweden)

    Edwin O. Willis

    1984-01-01

    Full Text Available Cercomacra and Schistocichla antbirds (Formicariidae favor dense foliage and seldom follow army ants for flushed prey, since the ants move through open forest understory as well as through dense zones. Two other lineages, the Drymophila-Hypocnemis lineage (of dense woodland understory and the Formicivora lineage (of dense bushes in dry or semiopen zones, also cannot follow ants regularly through open forest understory.

  19. Do herbivores eavesdrop on ant chemical communication to avoid predation?

    Directory of Open Access Journals (Sweden)

    David J Gonthier

    Full Text Available Strong effects of predator chemical cues on prey are common in aquatic and marine ecosystems, but are thought to be rare in terrestrial systems and specifically for arthropods. For ants, herbivores are hypothesized to eavesdrop on ant chemical communication and thereby avoid predation or confrontation. Here I tested the effect of ant chemical cues on herbivore choice and herbivory. Using Margaridisa sp. flea beetles and leaves from the host tree (Conostegia xalapensis, I performed paired-leaf choice feeding experiments. Coating leaves with crushed ant liquids (Azteca instabilis, exposing leaves to ant patrolling prior to choice tests (A. instabilis and Camponotus textor and comparing leaves from trees with and without A. instabilis nests resulted in more herbivores and herbivory on control (no ant-treatment relative to ant-treatment leaves. In contrast to A. instabilis and C. textor, leaves previously patrolled by Solenopsis geminata had no difference in beetle number and damage compared to control leaves. Altering the time A. instabilis patrolled treatment leaves prior to choice tests (0-, 5-, 30-, 90-, 180-min. revealed treatment effects were only statistically significant after 90- and 180-min. of prior leaf exposure. This study suggests, for two ecologically important and taxonomically diverse genera (Azteca and Camponotus, ant chemical cues have important effects on herbivores and that these effects may be widespread across the ant family. It suggests that the effect of chemical cues on herbivores may only appear after substantial previous ant activity has occurred on plant tissues. Furthermore, it supports the hypothesis that herbivores use ant chemical communication to avoid predation or confrontation with ants.

  20. A Theoretic Basis for IS? The Contribution of ANT

    Directory of Open Access Journals (Sweden)

    Jim Underwood

    2002-11-01

    Full Text Available Representation is a key issue of IS design and operation that is often ignored. Actor-network theory (ANT, a semiotic theory of stakeholders, provides a way of dealing with representation. Combining aspects of ANT and Foucault's discourse theory allows us to include concepts as actors and promises a flexible and durable foundation for IS practice, but ANT itself indicates that the search for a purely theoretical foundation for IS is misguided.

  1. Desenvolupament d'una plataforma d'anuncis geolocalitzats

    OpenAIRE

    Martin Alaminos, David

    2017-01-01

    Hem desenvolupat un sistema capaç de determinar el posicionament dels anuncis que emeten uns beacons. Es tracta d'un pipeline de dades compost per un algorisme de subhasta pels anunciants, un estimador del rendiment dels anuncis mitjançant machine learning i una agregació d'ambdós resultats. We developed a system capable of establishing the positioning of advertisements broadcast by a set of beacons. It is a data pipeline consisting in an auction algorithm for advertisers, a performance es...

  2. Filtros cerámicos, una alternativa de agua segura

    OpenAIRE

    Lerma Arias, Daniel Alberto

    2012-01-01

    Ante las bajas coberturas de acueducto y alcantarillado en la zona rural de Colombia y los altos costos de implementación de sistemas de potabilización y distribución convencionales es importante evaluar la viabilidad técnica y económica de sistemas alternativos de tratamiento de agua potable al alcance de comunidades rurales y de bajos recursos; por tanto se analiza una tecnología alternativa que aun no ha sido probada en Colombia como son los filtros cerámicos impregnados con plata coloidal...

  3. Compromiso organizacional en una muestra de trabajadores mexicanos

    OpenAIRE

    NORMA BETANZOS DÍAZ; PATRICIA ANDRADE PALOS; FRANCISCO PAZ RODRÍGUEZ

    2006-01-01

    El compromiso organizacional es un constructo que presenta gran interés para los psicólogos y aquellos involucrados con el recurso humano. Las investigaciones se han dirigido a determinar aquellos aspectos que lo forman y mantienen, sin embargo hay revisiones teóricas que evidencían que aún hay diferencias en la conceptualización y por tanto en su medición. La presente investigación adoptó una posición integradora ante las diferentes perspectivas de estudio para determinar si la aplicación de...

  4. Historia de una histeria

    Directory of Open Access Journals (Sweden)

    Jorge Luis Gómez

    2015-01-01

    Full Text Available Una versión ecuatoriana de la novela "La guerra de los mundos" de H. G. Wells, en audición radiofónica de Radio Quito, en 1949, inauguró formalmente en el Ecuador la historia de las histerias colectivas. En este breve texto, el autor hace una reflexión sobre este fenómeno de masas.

  5. Insecticide transfer efficiency and lethal load in Argentine ants

    Energy Technology Data Exchange (ETDEWEB)

    Hooper-Bui, L.M. [Department of Environmental Science, Louisiana State University, Baton Rouge, LA 70803 (United States); Department of Entomology, University of California, Riverside, CA 92521 (United States); Kwok, E.S.C. [Department of Cell Biology and Neuroscience, University of California, Riverside, CA 92521 (United States); Buchholz, B.A., E-mail: buchholz2@llnl.gov [Center for Accelerator Mass Spectrometry, Lawrence Livermore National Laboratory, Livermore, CA 94551 (United States); Department of Environmental Toxicology, University of California, Davis, CA 95616 (United States); Rust, M.K. [Department of Entomology, University of California, Riverside, CA 92521 (United States); Eastmond, D.A. [Department of Cell Biology and Neuroscience, University of California, Riverside, CA 92521 (United States); Vogel, J.S. [Center for Accelerator Mass Spectrometry, Lawrence Livermore National Laboratory, Livermore, CA 94551 (United States)

    2015-10-15

    Trophallaxis between individual worker ants and the toxicant load in dead and live Argentine ants (Linepithema humile) in colonies exposed to fipronil and hydramethylnon experimental baits were examined using accelerator mass spectrometry (AMS). About 50% of the content of the crop containing trace levels of {sup 14}C-sucrose, {sup 14}C-hydramethylnon, and {sup 14}C-fipronil was shared between single donor and recipient ants. Dead workers and queens contained significantly more hydramethylnon (122.7 and 22.4 amol/μg ant, respectively) than did live workers and queens (96.3 and 10.4 amol/μg ant, respectively). Dead workers had significantly more fipronil (420.3 amol/μg ant) than did live workers (208.5 amol/μg ant), but dead and live queens had equal fipronil levels (59.5 and 54.3 amol/μg ant, respectively). The distribution of fipronil differed within the bodies of dead and live queens; the highest amounts of fipronil were recovered in the thorax of dead queens whereas live queens had the highest levels in the head. Resurgence of polygynous ant colonies treated with hydramethylnon baits may be explained by queen survival resulting from sublethal doses due to a slowing of trophallaxis throughout the colony. Bait strategies and dose levels for controlling insect pests need to be based on the specific toxicant properties and trophic strategies for targeting the entire colony.

  6. Improved Ant Colony Clustering Algorithm and Its Performance Study

    Science.gov (United States)

    Gao, Wei

    2016-01-01

    Clustering analysis is used in many disciplines and applications; it is an important tool that descriptively identifies homogeneous groups of objects based on attribute values. The ant colony clustering algorithm is a swarm-intelligent method used for clustering problems that is inspired by the behavior of ant colonies that cluster their corpses and sort their larvae. A new abstraction ant colony clustering algorithm using a data combination mechanism is proposed to improve the computational efficiency and accuracy of the ant colony clustering algorithm. The abstraction ant colony clustering algorithm is used to cluster benchmark problems, and its performance is compared with the ant colony clustering algorithm and other methods used in existing literature. Based on similar computational difficulties and complexities, the results show that the abstraction ant colony clustering algorithm produces results that are not only more accurate but also more efficiently determined than the ant colony clustering algorithm and the other methods. Thus, the abstraction ant colony clustering algorithm can be used for efficient multivariate data clustering. PMID:26839533

  7. Insecticide transfer efficiency and lethal load in Argentine ants

    International Nuclear Information System (INIS)

    Hooper-Bui, L.M.; Kwok, E.S.C.; Buchholz, B.A.; Rust, M.K.; Eastmond, D.A.; Vogel, J.S.

    2015-01-01

    Trophallaxis between individual worker ants and the toxicant load in dead and live Argentine ants (Linepithema humile) in colonies exposed to fipronil and hydramethylnon experimental baits were examined using accelerator mass spectrometry (AMS). About 50% of the content of the crop containing trace levels of 14 C-sucrose, 14 C-hydramethylnon, and 14 C-fipronil was shared between single donor and recipient ants. Dead workers and queens contained significantly more hydramethylnon (122.7 and 22.4 amol/μg ant, respectively) than did live workers and queens (96.3 and 10.4 amol/μg ant, respectively). Dead workers had significantly more fipronil (420.3 amol/μg ant) than did live workers (208.5 amol/μg ant), but dead and live queens had equal fipronil levels (59.5 and 54.3 amol/μg ant, respectively). The distribution of fipronil differed within the bodies of dead and live queens; the highest amounts of fipronil were recovered in the thorax of dead queens whereas live queens had the highest levels in the head. Resurgence of polygynous ant colonies treated with hydramethylnon baits may be explained by queen survival resulting from sublethal doses due to a slowing of trophallaxis throughout the colony. Bait strategies and dose levels for controlling insect pests need to be based on the specific toxicant properties and trophic strategies for targeting the entire colony.

  8. Disease dynamics in a specialized parasite of ant societies

    DEFF Research Database (Denmark)

    Andersen, Sandra Breum; Ferrari, Matthew; Evans, Harry C.

    2012-01-01

    Coevolution between ant colonies and their rare specialized parasites are intriguing, because lethal infections of workers may correspond to tolerable chronic diseases of colonies, but the parasite adaptations that allow stable coexistence with ants are virtually unknown. We explore the trade......-offs experienced by Ophiocordyceps parasites manipulating ants into dying in nearby graveyards. We used field data from Brazil and Thailand to parameterize and fit a model for the growth rate of graveyards. We show that parasite pressure is much lower than the abundance of ant cadavers suggests...

  9. Signals can trump rewards in attracting seed-dispersing ants.

    Directory of Open Access Journals (Sweden)

    Kyle M Turner

    Full Text Available Both rewards and signals are important in mutualisms. In myrmecochory, or seed dispersal by ants, the benefits to plants are relatively well studied, but less is known about why ants pick up and move seeds. We examined seed dispersal by the ant Aphaenogaster rudis of four co-occurring species of plants, and tested whether morphology, chemical signaling, or the nutritional quality of fatty seed appendages called elaiosomes influenced dispersal rates. In removal trials, ants quickly collected diaspores (seeds plus elaiosomes of Asarum canadense, Trillium grandiflorum, and Sanguinaria canadensis, but largely neglected those of T. erectum. This discrepancy was not explained by differences in the bulk cost-benefit ratio, as assessed by the ratio of seed to elaiosome mass. We also provisioned colonies with diaspores from one of these four plant species or no diaspores as a control. Colonies performed best when fed S. canadensis diaspores, worst when fed T. grandiflorum, and intermediately when fed A. canadense, T. erectum, or no diaspores. Thus, the nutritional rewards in elaiosomes affected colony performance, but did not completely predict seed removal. Instead, high levels of oleic acid in T. grandiflorum elaiosomes may explain why ants disperse these diaspores even though they reduce ant colony performance. We show for the first time that different elaiosome-bearing plants provide rewards of different quality to ant colonies, but also that ants appear unable to accurately assess reward quality when encountering seeds. Instead, we suggest that signals can trump rewards as attractants of ants to seeds.

  10. The evolution of invasiveness in garden ants.

    Directory of Open Access Journals (Sweden)

    Sylvia Cremer

    Full Text Available It is unclear why some species become successful invaders whilst others fail, and whether invasive success depends on pre-adaptations already present in the native range or on characters evolving de-novo after introduction. Ants are among the worst invasive pests, with Lasius neglectus and its rapid spread through Europe and Asia as the most recent example of a pest ant that may become a global problem. Here, we present the first integrated study on behavior, morphology, population genetics, chemical recognition and parasite load of L. neglectus and its non-invasive sister species L. turcicus. We find that L. neglectus expresses the same supercolonial syndrome as other invasive ants, a social system that is characterized by mating without dispersal and large networks of cooperating nests rather than smaller mutually hostile colonies. We conclude that the invasive success of L. neglectus relies on a combination of parasite-release following introduction and pre-adaptations in mating system, body-size, queen number and recognition efficiency that evolved long before introduction. Our results challenge the notion that supercolonial organization is an inevitable consequence of low genetic variation for chemical recognition cues in small invasive founder populations. We infer that low variation and limited volatility in cuticular hydrocarbon profiles already existed in the native range in combination with low dispersal and a highly viscous population structure. Human transport to relatively disturbed urban areas thus became the decisive factor to induce parasite release, a well established general promoter of invasiveness in non-social animals and plants, but understudied in invasive social insects.

  11. The Evolution of Invasiveness in Garden Ants

    Science.gov (United States)

    Cremer, Sylvia; Ugelvig, Line V.; Drijfhout, Falko P.; Schlick-Steiner, Birgit C.; Steiner, Florian M.; Seifert, Bernhard; Hughes, David P.; Schulz, Andreas; Petersen, Klaus S.; Konrad, Heino; Stauffer, Christian; Kiran, Kadri; Espadaler, Xavier; d'Ettorre, Patrizia; Aktaç, Nihat; Eilenberg, Jørgen; Jones, Graeme R.; Nash, David R.; Pedersen, Jes S.; Boomsma, Jacobus J.

    2008-01-01

    It is unclear why some species become successful invaders whilst others fail, and whether invasive success depends on pre-adaptations already present in the native range or on characters evolving de-novo after introduction. Ants are among the worst invasive pests, with Lasius neglectus and its rapid spread through Europe and Asia as the most recent example of a pest ant that may become a global problem. Here, we present the first integrated study on behavior, morphology, population genetics, chemical recognition and parasite load of L. neglectus and its non-invasive sister species L. turcicus. We find that L. neglectus expresses the same supercolonial syndrome as other invasive ants, a social system that is characterized by mating without dispersal and large networks of cooperating nests rather than smaller mutually hostile colonies. We conclude that the invasive success of L. neglectus relies on a combination of parasite-release following introduction and pre-adaptations in mating system, body-size, queen number and recognition efficiency that evolved long before introduction. Our results challenge the notion that supercolonial organization is an inevitable consequence of low genetic variation for chemical recognition cues in small invasive founder populations. We infer that low variation and limited volatility in cuticular hydrocarbon profiles already existed in the native range in combination with low dispersal and a highly viscous population structure. Human transport to relatively disturbed urban areas thus became the decisive factor to induce parasite release, a well established general promoter of invasiveness in non-social animals and plants, but understudied in invasive social insects. PMID:19050762

  12. [Syagrus romanzoffiana (Arecaceae) seed utilization by ants in a secondary forest in South Brazil].

    Science.gov (United States)

    Silva, Fernanda R; Begnini, Romualdo M; Klier, Vinícius A; Scherer, Karla Z; Lopes, Benedito C; Castellani, Tânia T

    2009-01-01

    Ants can nest in a wide variety of substracts. This paper shows Syagrus romanzoffiana seed utilization by ants in an Atlantic secondary forest. We report 29 seeds occupied by small-bodied ants, with 27 of them showing at least two ant development stages. Although a large number of seeds were sampled, a low level of ant occupation was observed.

  13. Relative effects of disturbance on red imported fire ants and native ant species in a longleaf pine ecosystem

    DEFF Research Database (Denmark)

    Stuble, Katharine L.; Kirkman, L. Katherine; Carroll, C. Ronald

    2011-01-01

    and cases in which non-native species become established in intact (lacking extensive anthropogenic soil disturbance) communities and subsequently diminish the abundance and richness of native species is challenging on the basis of observation alone. The red imported fire ant (Solenopsis invicta......), an invasive species that occurs throughout much of the southeastern United States, is such an example. Rather than competitively displacing native species, fire ants may become established only in disturbed areas in which native species richness and abundance are already reduced. We used insecticide to reduce......, the abundance of native ants increased to levels comparable to those in control plots after 1 year. Our findings suggest that factors other than large reductions in ant abundance and species density (number of species per unit area) may affect the establishment of fire ants and that the response of native ants...

  14. Ecology: 'Devil's gardens' bedevilled by ants.

    Science.gov (United States)

    Frederickson, Megan E; Greene, Michael J; Gordon, Deborah M

    2005-09-22

    'Devil's gardens' are large stands of trees in the Amazonian rainforest that consist almost entirely of a single species, Duroia hirsuta, and, according to local legend, are cultivated by an evil forest spirit. Here we show that the ant Myrmelachista schumanni, which nests in D. hirsuta stems, creates devil's gardens by poisoning all plants except its host plants with formic acid. By killing these other plants, M. schumanni provides its colonies with abundant nest sites--a long-lasting benefit as colonies can live for 800 years.

  15. Ante-natal ionising radiation and cancer

    International Nuclear Information System (INIS)

    Anon.

    1988-01-01

    This editorial comments on the latest reports of the Oxford Survey of Childhood Cancer (now based on Birmingham). With 14759 pairs, the latest survey is over 10-fold larger than the 1958 report and the calculation of fatal childhood cancer rate at one case in 990 ante-natal radiographic examinations is rather larger than the early estimates, in spite of the fetal radiation dose having been halved and the cure rate for childhood leukemia being much improved. Comments are made on the comparisons with bomb survivors, and on the much increased fatal cancer incidence after first trimester radiography. (UK)

  16. Ant Systems for a Dynamic TSP - Ants Caught in a Traffic Jam

    NARCIS (Netherlands)

    Eyckelhof, C.J.; Dorigo, M.; Caro Di, G.; Snoek, M.; Sampels, M.

    2002-01-01

    In this paper we present a new Ants System approach to a dynamic Travelling Salesman Problem. Here the travel times between the cities are subject to change. To handle this dynamism several ways of adapting the pheromone matrix both locally and globally are considered. We show that the strategy of

  17. Antes de que anochezca. Derechos humanos y clases medias en Argentina antes y en los inicios del golpe de Estado de 1976

    Directory of Open Access Journals (Sweden)

    Sebastián CARASSAI

    2010-05-01

    Full Text Available RESUMEN: En este trabajo se analiza el tema de los derechos humanos en Argentina antes y durante el comienzo del golpe de Estado de 1976 (1970-1977. Se argumenta que la inexistencia de una conciencia social sobre tales derechos en la primera mitad de la década y el temprano y extendido consenso en torno a lo que más tarde se llamará «teoría de los dos demonios» son dos elementos fundamentales a la hora de explicar la actitud de las clases medias no radicalizadas políticamente ante el surgimiento del discurso de los derechos humanos en Argentina. ABSTRACT: This study explores the issue of human rights in Argentina in the period before and at the beginning of the 1976 coup d’état (1970-1977. It claims that the absence of a social conscience about human rights in the first part of the decade and the early and huge consensus about what later would be called «the two demons theory» are two essential elements to explain the attitude of the middle classes not involved in political struggle toward the emergence of a human rights discourse in Argentina.

  18. Fragmentos para una historia del cuerpo en Chile.

    Directory of Open Access Journals (Sweden)

    Juan Aravena Hernández

    2011-09-01

    Full Text Available Sin duda la historia del cuerpo es la historia de un gran olvido; un olvido silencioso, casi cotidiano por convención, pero, sobre todo, uno que se ha ido forjando en Occidente por medio de la implicancia tanto desde la tensión situada en el credo cristiano entre el pecado y la redención como por la noción epistemológica tradicional asumida de la pertenencia estricta del cuerpo al mundo de la naturaleza y no al de la cultura. Ante lo anterior, Fragmentos para una historia del cuerpo en Chile se presenta como un conjunto de trabajos y visiones historiográficas que tienen al cuerpo como su eje conector, así mismo, como su objeto central de estudio en sus diversas perspectivas analíticas. Significados, representaciones, percepciones, continuidades y transformaciones referidas al cuerpo se presentan en esta obra dando cuenta, no sólo de una suerte de intento historiográfico nacional de saldar cuentas con la ausencia histórica de la corporalidad, sino más bien como una forma que, desde el acercamiento historiográfico a través del cuerpo, abre nuevas entradas y condiciones de posibilidad para la (una historia; una historia atravesada esta vez, no sólo de ideas y aconteceres, sino también, de tactos y roces, de carnes y huesos.

  19. Nectar Theft and Floral Ant-Repellence: A Link between Nectar Volume and Ant-Repellent Traits?

    Science.gov (United States)

    Ballantyne, Gavin; Willmer, Pat

    2012-01-01

    As flower visitors, ants rarely benefit a plant. They are poor pollinators, and can also disrupt pollination by deterring other flower visitors, or by stealing nectar. Some plant species therefore possess floral ant-repelling traits. But why do particular species have such traits when others do not? In a dry forest in Costa Rica, of 49 plant species around a third were ant-repellent at very close proximity to a common generalist ant species, usually via repellent pollen. Repellence was positively correlated with the presence of large nectar volumes. Repellent traits affected ant species differently, some influencing the behaviour of just a few species and others producing more generalised ant-repellence. Our results suggest that ant-repellent floral traits may often not be pleiotropic, but instead could have been selected for as a defence against ant thieves in plant species that invest in large volumes of nectar. This conclusion highlights to the importance of research into the cost of nectar production in future studies into ant-flower interactions. PMID:22952793

  20. Partial incompatibility between ants and symbiotic fungi in two sympatric species of Acromyrmex leaf-cutting ants.

    Science.gov (United States)

    Bot, A N; Rehner, S A; Boomsma, J J

    2001-10-01

    We investigate the nature and duration of incompatibility between certain combinations of Acromyrmex leaf-cutting ants and symbiotic fungi, taken from sympatric colonies of the same or a related species. Ant-fungus incompatibility appeared to be largely independent of the ant species involved, but could be explained partly by genetic differences among the fungus cultivars. Following current theoretical considerations, we develop a hypothesis, originally proposed by S. A. Frank, that the observed incompatibilities are ultimately due to competitive interactions between genetically different fungal lineages, and we predict that the ants should have evolved mechanisms to prevent such competition between cultivars within a single garden. This requires that the ants are able to recognize unfamiliar fungi, and we show that this is indeed the case. Amplified fragment length polymorphism genotyping further shows that the two sympatric Acromyrmex species share each other's major lineages of cultivar, confirming that horizontal transfer does occasionally take place. We argue and provide some evidence that chemical substances produced by the fungus garden may mediate recognition of alien fungi by the ants. We show that incompatibility between ants and transplanted, genetically different cultivars is indeed due to active killing of the novel cultivar by the ants. This incompatibility disappears when ants are force-fed the novel cultivar for about a week, a result that is consistent with our hypothesis of recognition induced by the resident fungus and eventual replacement of incompatibility compounds during force-feeding.

  1. The importance of ants in cave ecology, with new records and behavioral observations of ants in Arizona caves

    Directory of Open Access Journals (Sweden)

    Robert B. Pape

    2016-09-01

    Full Text Available The importance of ants as elements in cave ecology has been mostly unrecognized. A global list of ant species recorded from caves, compiled from a review of existing literature, is presented. This paper also reviews what is currently known about ants occurring in Arizona (USA caves. The diversity and distribution represented in these records suggests ants are relatively common cave visitors (trogloxenes. A general utilization of caves by ants within both temperate and tropical latitudes may be inferred from this combined evidence. Observations of ant behavior in Arizona caves demonstrate a low level and sporadic, but persistent, use of these habitats and their contained resources by individual ant colonies. Documentation of Neivamyrmex sp. preying on cave-inhabiting arthropods is reported here for the first time. Observations of hypogeic army ants in caves suggests they may not penetrate to great vertical depth in search of prey, but can be persistent occupants in relatively shallow, horizontal sections of caves where they may prey on endemic cave animals. First cave records for ten ant species are reported from Arizona caves. These include two species of Neivamyrmex (N. nigrescens Cresson and Neivamyrmex sp.; Formicidae: Dorylinae, four myrmicines (Pheidole portalensis Wilson, Pheidole cf. porcula Wheeler, Solenopsis aurea Wheeler and Stenamma sp. Westwood, one dolichoderine (Forelius keiferi Wheeler and three formicines (Lasius arizonicus Wheeler, L. sitiens Wilson, and Camponotus sp. Mayr.

  2. ANT tuner retrofit for LEB cavity

    International Nuclear Information System (INIS)

    Walling, L.; Goren, Y.; Kwiatkowski, S.

    1994-03-01

    This report describes a ferrite tuner design for the LEB cavity that utilizes techniques for bonding ferrite to metallic cooling plates that is utilized in the high-power rf and microwave industry. A test tuner was designed to fit into the existing LEB-built magnet and onto the Grimm LEB Cavity. It will require a new vacuum window in order to attain maximal tuning range and high voltage capability and a new center conductor of longer length and a different vacuum window connection than the Grimm center conductor. However, the new center conductor will be essentially identical to the Grimm center conductor in its basic construction and in the way it connects to the stand for support. The tuner is mechanically very similar to high-power stacked circulators built by ANT of Germany and was designed according to ANT's established engineering and design criteria and SSC LEB tuning and power requirements. The tuner design incorporates thin tiles of ferrite glued using a high-radiation-resistance epoxy to copper-plated stainless steel cooling plates of thickness 6.5 mm with water cooling channels inside the plates. The cooling plates constitute 16 pie-shaped segments arranged in a disk. They are electrically isolated from each other to suppress eddy currents. Five of these disks are arranged in parallel with high-pressure rf contacts between the plates at the outer radius. The end walls are slotted copper-plated stainless steel of thickness 3 mm

  3. Loading pattern optimization using ant colony algorithm

    International Nuclear Information System (INIS)

    Hoareau, Fabrice

    2008-01-01

    Electricite de France (EDF) operates 58 nuclear power plants (NPP), of the Pressurized Water Reactor type. The loading pattern optimization of these NPP is currently done by EDF expert engineers. Within this framework, EDF R and D has developed automatic optimization tools that assist the experts. LOOP is an industrial tool, developed by EDF R and D and based on a simulated annealing algorithm. In order to improve the results of such automatic tools, new optimization methods have to be tested. Ant Colony Optimization (ACO) algorithms are recent methods that have given very good results on combinatorial optimization problems. In order to evaluate the performance of such methods on loading pattern optimization, direct comparisons between LOOP and a mock-up based on the Max-Min Ant System algorithm (a particular variant of ACO algorithms) were made on realistic test-cases. It is shown that the results obtained by the ACO mock-up are very similar to those of LOOP. Future research will consist in improving these encouraging results by using parallelization and by hybridizing the ACO algorithm with local search procedures. (author)

  4. Ant Foraging Behavior for Job Shop Problem

    Directory of Open Access Journals (Sweden)

    Mahad Diyana Abdul

    2016-01-01

    Full Text Available Ant Colony Optimization (ACO is a new algorithm approach, inspired by the foraging behavior of real ants. It has frequently been applied to many optimization problems and one such problem is in solving the job shop problem (JSP. The JSP is a finite set of jobs processed on a finite set of machine where once a job initiates processing on a given machine, it must complete processing and uninterrupted. In solving the Job Shop Scheduling problem, the process is measure by the amount of time required in completing a job known as a makespan and minimizing the makespan is the main objective of this study. In this paper, we developed an ACO algorithm to minimize the makespan. A real set of problems from a metal company in Johor bahru, producing 20 parts with jobs involving the process of clinching, tapping and power press respectively. The result from this study shows that the proposed ACO heuristics managed to produce a god result in a short time.

  5. The effect of diet and opponent size on aggressive interactions involving caribbean crazy ants (Nylanderia fulva.

    Directory of Open Access Journals (Sweden)

    Katherine C Horn

    Full Text Available Biotic interactions are often important in the establishment and spread of invasive species. In particular, competition between introduced and native species can strongly influence the distribution and spread of exotic species and in some cases competition among introduced species can be important. The Caribbean crazy ant, Nylanderia fulva, was recently introduced to the Gulf Coast of Texas, and appears to be spreading inland. It has been hypothesized that competition with the red imported fire ant, Solenopsis invicta, may be an important factor in the spread of crazy ants. We investigated the potential of interspecific competition among these two introduced ants by measuring interspecific aggression between Caribbean crazy ant workers and workers of Solenopsis invicta. Specifically, we examined the effect of body size and diet on individual-level aggressive interactions among crazy ant workers and fire ants. We found that differences in diet did not alter interactions between crazy ant workers from different nests, but carbohydrate level did play an important role in antagonistic interactions with fire ants: crazy ants on low sugar diets were more aggressive and less likely to be killed in aggressive encounters with fire ants. We found that large fire ants engaged in fewer fights with crazy ants than small fire ants, but fire ant size affected neither fire ant nor crazy ant mortality. Overall, crazy ants experienced higher mortality than fire ants after aggressive encounters. Our findings suggest that fire ant workers might outcompete crazy ant workers on an individual level, providing some biotic resistance to crazy ant range expansion. However, this resistance may be overcome by crazy ants that have a restricted sugar intake, which may occur when crazy ants are excluded from resources by fire ants.

  6. Aphid egg protection by ants: a novel aspect of the mutualism between the tree-feeding aphid Stomaphis hirukawai and its attendant ant Lasius productus

    Science.gov (United States)

    Matsuura, Kenji; Yashiro, Toshihisa

    2006-10-01

    Aphids often form mutualistic associations with ants, in which the aphids provide the ants with honeydew and the ants defend the aphids from predators. In this paper, we report aphid egg protection by ants as a novel aspect of the deeply interdependent relationship between a tree-feeding aphid and its attendant ant. The ant Lasius productus harbours oviparous females, males, and eggs of the hinoki cypress-feeding aphid Stomaphis hirukawai in its nests in winter. We investigated the behaviour of ants kept with aphid eggs in petri dishes to examine whether the ants recognise the aphid eggs and tend them or only provide a refuge for the aphids. Workers carried almost all of the aphid eggs into the nest within 24 h. The ants indiscriminately tended aphid eggs collected from their own colonies and those from other ant colonies. The ants cleaned the eggs and piled them up in the nest, and egg tending by ants dramatically increased aphid egg survival rates. Starving the ants showed no significant effect on aphid egg survivorship. Without ants, aphid eggs were rapidly killed by fungi. These results suggested that grooming by the ants protected the aphid eggs, at least, against pathogenic fungi. This hygienic service afforded by the ants seems indispensable for egg survival of these aphids in an environment rich in potentially pathogenic microorganisms.

  7. Current and potential ant impacts in the Pacific region

    Science.gov (United States)

    Loope, Lloyd L.; Krushelnycky, Paul D.

    2007-01-01

    Worldwide, ants are a powerful ecological force, and they appear to be dominant components of animal communities of many tropical and temperate ecosystems in terms of biomass and numbers of individuals (Bluthgen et al. 2000). For example, ants comprise up to 94% of arthropod individuals in fogging samples taken from diverse lowland tropical rainforest canopies, and 86% of the biomass (Davidson et al. 2003). The majority of these ant species and individuals obtain carbohydrates either from extrafloral nectaries or from sap-feeding Hemiptera that pass carbohydrate-rich “honeydew” to attending ants while concentrating nitrogen (N) from N-poor plant sap (Davidson et al. 2003). Honeydew and nectar represent key resources for arboreal ant species, although most ant species are at least partly carnivorous or scavengers (Bluthgen et al. 2004). In contrast to most of the terrestrial world, the biotas of many Pacific islands evolved without ants. Whereas endemic ant species are found in New Zealand (ca. 10 spp.), Tonga (ca. 10 spp.), and Samoa (ca. 12 spp.), other islands of Polynesia and parts of Micronesia likely lack native ants (Wilson and Taylor 1967, Wetterer 2002, Wetterer and Vargo 2003). About 20 Indo-Australian and western Pacific ant species range to the east and north of Samoa, but it is unclear how many of these were transported there by humans at some time (Wilson and Taylor 1967). Most of the remainder of the ant species currently found on Pacific islands are widespread species that fall in the category of “tramp species,” dispersed by recent human commerce and generally closely tied to human activity and urban areas (Wilson and Taylor 1967, McGlynn 1999). In Pacific island situations, some of these tramp ant species are able to thrive beyond areas of human activity. Relatively few ant species have been successful invaders of native communities on continents, and these include most of the species that pose the greatest problems for Pacific islands

  8. Geomarketing en salud para ubicar oferta de servicios médicos de valor. Caso: Proyecto de investigación para ubicar una nueva oferta hospitalaria

    Directory of Open Access Journals (Sweden)

    Luis Alfonso Pérez Romero

    2008-01-01

    Full Text Available El geomarketing de la salud es útil para definir políticas sanitarias y buscar un mayor bienestar bio-psico y social de las personas que cohabitan un mismo espacio geográfico. Los límites de división geográfica y política entre comunidades son importantes para el control y manejo de epidemias, endemias y pandemias. La ubicación geográfica (espacio que ocupa una persona y sus pares en un tiempo definido, nos muestra perfiles culturales similares, manifiestos en hábitos, costumbres y patrones de comportamiento similares. Con esta información de manera oportuna y lo más exacta posible se podrán realizar las actividades de promoción de la salud y prevención de las enfermedades que conduzcan a un bienestar sostenible de la población. Es recomendable, para toda oferta de servicios de salud, ubicar la competencia directa e indirecta de la localidad, con su respectiva demanda en servicios de salud, para así diseñar una oferta de valor que vaya dirigida a un mercado meta que sea sustentable y sostenible. Este artículo muestra una metodología de geomarketing para ubicar la oferta, las necesidades deseos y demanda de los servicios de salud pública y privada que contribuya en el diseño de los planes estratégicos de marketing en salud.

  9. Ultrastructure of antennal sensillae of the samsum ant ...

    African Journals Online (AJOL)

    Black ant (Samsum), Pachycodyla sennarrensis, stings and injects venom and inflicts allergy (a rare clinical problem) due to its local and systemic reaction, which is considered as a health hazard amongst Saudi society. Thus, black ant is a source of serious concern for the government and experts as well.

  10. Development of a Bait System for the Pharaoh's Ant, Monomorium ...

    African Journals Online (AJOL)

    The infestation of the Pharaoh's ant, Monomorium pharaonis L. is widespread and, sometimes, very serious in homes, hospitals, restaurants, factories, etc. People are helpless because effective baited traps are not available locally, and little has been done locally to develop effective control strategies for these ants.

  11. A preliminary checklist of the ants (Hymenoptera: Formicidae) of ...

    African Journals Online (AJOL)

    A preliminary species checklist of the ants (Hymenoptera: Formicidae) of. Kakamega Forest, Western Kenya, is presented. The species list is based on specimens sampled from 1999 until 2009, which are deposited in the ant collection of the Zoological Research Museum Koenig, Bonn, Germany, and the Natural History ...

  12. Ant species richness of fynbos and forest ecosystems in the ...

    African Journals Online (AJOL)

    The ant fauna in fynbos and forest habitats in the southern Cape are compared. There is no significant difference in ant species richness between the two undisturbed habitat types, and the only two species common to both are Acantholepis capensis and Camponotus maculatus. The degree of Hakea sericea infestation in ...

  13. Volatile chemicals in glands of the carpenter ant, Camponotus ...

    African Journals Online (AJOL)

    Volatile chemicals in glands of the carpenter ant, Camponotus arminius. J.M. Brand, L.V. Mabinya, E.D. Morgan. Abstract. Camponotus arminius is a large black carpenter ant that occurs in tropical and sub-tropical Africa and has extensive foraging trails both in trees and on the ground. Analysis of excised mandibular glands ...

  14. Novel Phialophora species from leaf-cutting ants (tribe Attini)

    NARCIS (Netherlands)

    Attili-Angelis, D.; Duarte, A.P.M.; Pagnocca, F.C.; Nagamoto, N.S.; de Vries, M.; Stielow, J.B.; de Hoog, G.S.

    2014-01-01

    Ants in the tribe Attini (Hymenoptera, Formicidae) maintain a 50 million-year-old lifestyle of co-evolution with symbiotic basidiomycetous fungi which they cultivate as essential source of nutrition. However, other microorganisms have been reported from ant habitats indicating a higher diversity of

  15. Why do house-hunting ants recruit in both directions?

    NARCIS (Netherlands)

    Planqué, R.; Dechaume-Moncharmont, F.-X.; Franks, N.R.; Kovacs, T.; Marshall, J.A.R.

    2007-01-01

    To perform tasks, organisms often use multiple procedures. Explaining the breadth of such behavioural repertoires is not always straightforward. During house hunting, colonies of Temnothorax albipennis ants use a range of behaviours to organise their emigrations. In particular, the ants use tandem

  16. Tracing the rise of ants - out of the ground.

    Directory of Open Access Journals (Sweden)

    Andrea Lucky

    Full Text Available The evolution of ants (Hymenoptera: Formicidae is increasingly well-understood due to recent phylogenetic analyses, along with estimates of divergence times and diversification rates. Yet, leading hypotheses regarding the ancestral habitat of ants conflict with new findings that early ant lineages are cryptic and subterranean. Where the ants evolved, in respect to habitat, and how habitat shifts took place over time have not been formally tested. Here, we reconstruct the habitat transitions of crown-group ants through time, focusing on where they nest and forage (in the canopy, litter, or soil. Based on ancestral character reconstructions, we show that in contrast to the current consensus based on verbal arguments that ants evolved in tropical leaf litter, the soil is supported as the ancestral stratum of all ants. We also find subsequent movements up into the litter and, in some cases, into the canopy. Given the global importance of ants, because of their diversity, ecological influence and status as the most successful eusocial lineage on Earth, understanding the early evolution of this lineage provides insight into the factors that made this group so successful today.

  17. In vitro studies of ante-mortem proliferation kinetics

    International Nuclear Information System (INIS)

    McBride, W.H.; Withers, H.R.

    1986-01-01

    Using K562 human erythroblastoid cells, it was concluded that dose fractionation has no discrepant effect on the ante-mortem proliferation kinetics of doomed cells as opposed to clonogenic cell survival and that effects on ante-mortem proliferation kinetics cannot be solely responsible for the differences in fractionation response between early and late responding tissues. (UK)

  18. Reciprocal genomic evolution in the ant-fungus agricultural symbiosis

    DEFF Research Database (Denmark)

    Nygaard, Sanne; Hu, Haofu; Li, Cai

    2016-01-01

    The attine ant-fungus agricultural symbiosis evolved over tens of millions of years, producing complex societies with industrial-scale farming analogous to that of humans. Here we document reciprocal shifts in the genomes and transcriptomes of seven fungus-farming ant species and their fungal...

  19. Life-Histories of Sub-Arctic Ants

    OpenAIRE

    Heinze, Jürgen

    1993-01-01

    Ant species belonging to seven genera occur in habitats near the tree line in the Northern Hemisphere. An analysis of colony founding strategies suggests that in addition to physiological cold resistance, behavioral and sociometric adaptations might be important for survival and propagation of ants in subarctic biomes.

  20. Studies of laboulbeniales (Fungi, Ascomycota) on myrmica ants (II)

    NARCIS (Netherlands)

    Haelewaters, Danny; Boer, Peter; Gort, Gerrit; Noordijk, Jinze

    2015-01-01

    One group of important insect parasites are the Laboulbeniales (Ascomycota), microscopic fungi that live attached to the exterior of their hosts, mainly beetles, but also mites, millipedes, earwigs, and ants. Rickia wasmannii is a common fungus in Europe and is limited to the ant genus Myrmica

  1. ADAPTIVE ANT COLONY OPTIMIZATION BASED GRADIENT FOR EDGE DETECTION

    Directory of Open Access Journals (Sweden)

    Febri Liantoni

    2014-08-01

    Full Text Available Ant Colony Optimization (ACO is a nature-inspired optimization algorithm which is motivated by ants foraging behavior. Due to its favorable advantages, ACO has been widely used to solve several NP-hard problems, including edge detection. Since ACO initially distributes ants at random, it may cause imbalance ant distribution which later affects path discovery process. In this paper an adaptive ACO is proposed to optimize edge detection by adaptively distributing ant according to gradient analysis. Ants are adaptively distributed according to gradient ratio of each image regions. Region which has bigger gradient ratio, will have bigger number of ant distribution. Experiments are conducted using images from various datasets. Precision and recall are used to quantitatively evaluate performance of the proposed algorithm. Precision and recall of adaptive ACO reaches 76.98 % and 96.8 %. Whereas highest precision and recall for standard ACO are 69.74 % and 74.85 %. Experimental results show that the adaptive ACO outperforms standard ACO which randomly distributes ants.

  2. Patterns of male parentage in the fungus-growing ants

    DEFF Research Database (Denmark)

    Villesen, Palle; Boomsma, JJ

    2003-01-01

    Ant queens from eight species, covering three genera of lower and two genera of higher attine ants, have exclusively or predominantly single mating. The ensuing full-sib colonies thus have a strong potential reproductive conflict between the queen and the workers over male production...

  3. Odorous house ants (Tapinoma sessile as back-seat drivers of localized ant decline in urban habitats.

    Directory of Open Access Journals (Sweden)

    Adam Salyer

    Full Text Available Invasive species and habitat disturbance threaten biodiversity worldwide by modifying ecosystem performance and displacing native organisms. Similar homogenization impacts manifest locally when urbanization forces native species to relocate or reinvade perpetually altered habitat. This study investigated correlations between ant richness and abundance in response to urbanization and the nearby presence of invasive ant species, odorous house ants (Tapinoma sessile, within its native region. Surveying localized ant composition within natural, semi-natural, and urban habitat supported efforts to determine whether T. sessile appear to be primary (drivers threats as instigators or secondary (passengers threats as inheritors of indigenous ant decline. Sampling 180 sites, evenly split between all habitats with and without T. sessile present, yielded 45 total species. Although urbanization and T. sessile presence factors were significantly linked to ant decline, their interaction correlated to the greatest reduction of total ant richness (74% and abundance (81%. Total richness appeared to decrease from 27 species to 18 when natural habitat is urbanized and from 18 species to 7 with T. sessile present in urban plots. Odorous house ant presence minimally influenced ant communities within natural and semi-natural habitat, highlighting the importance of habitat alteration and T. sessile presence interactions. Results suggest urbanization releases T. sessile from unknown constraints by decreasing ant richness and competition. Within urban environment, T. sessile are pre-adapted to quickly exploit new resources and grow to supercolony strength wherein T. sessile drive adjacent biodiversity loss. Odorous house ants act as passengers and drivers of ecological change throughout different phases of urban 'invasion'. This progression through surviving habitat alteration, exploiting new resources, thriving, and further reducing interspecific competition supports a

  4. Weaver Ants to Control Fruit Fly Damage to Tanzanian Mangoes

    DEFF Research Database (Denmark)

    Kirkegaard, Nina

    in Australia and West Africa. In this study, small scale farmers did not think weaver ants protected their mangoes from fruit flies. Observational studies confirmed the farmers’ views. No volatile compounds, likely to be responsible for the weaver ants’ deterrent effect, were identified. This study focused...... mangoes varied a lot with zero infestation in some fruits and more than 100 pupae emerging from other fruits, indicating that other factors than the presence of weaver ants affect the fruit flies’ decision on where to oviposit. It was not uncommon for farmers to place newly harvested mangoes below mango...... not shown to be effectively deterring fruit flies, there is no great motivation for farmers to adopt weaver ants. Assuming the weaver ants could be managed in a way that made weaver ants deter fruit flies effectively there are still some economic aspects which should be studied further. It is necessary...

  5. Behind every great ant, there is a great gut

    DEFF Research Database (Denmark)

    Poulsen, Michael; Sapountzis, Panagiotis

    2012-01-01

    on the potential contribution of the ants’ gut symbionts. This issue of Molecular Ecology contains a study by Anderson et al. (2012), who take a comparative approach to explore the link between trophic levels and ant microbiomes, specifically, to address three main questions: (i) Do closely related herbivorous...... conserved gut microbiomes, suggesting symbiont functions that directly relate to dietary preference of the ant host. These findings suggest an ecological role of gut symbionts in ants, for example, in metabolism and/or protection, and the comparative approach taken supports a model of co-evolution between...... ant species and specific core symbiont microbiomes. This study, thereby, highlights the omnipresence and importance of gut symbioses—also in the Hymenoptera—and suggests that these hitherto overlooked microbes likely have contributed to the ecological success of the ants....

  6. Endophytic fungi reduce leaf-cutting ant damage to seedlings

    Science.gov (United States)

    Bittleston, L. S.; Brockmann, F.; Wcislo, W.; Van Bael, S. A.

    2011-01-01

    Our study examines how the mutualism between Atta colombica leaf-cutting ants and their cultivated fungus is influenced by the presence of diverse foliar endophytic fungi (endophytes) at high densities in tropical leaf tissues. We conducted laboratory choice trials in which ant colonies chose between Cordia alliodora seedlings with high (Ehigh) or low (Elow) densities of endophytes. The Ehigh seedlings contained 5.5 times higher endophyte content and a greater diversity of fungal morphospecies than the Elow treatment, and endophyte content was not correlated with leaf toughness or thickness. Leaf-cutting ants cut over 2.5 times the leaf area from Elow relative to Ehigh seedlings and had a tendency to recruit more ants to Elow plants. Our findings suggest that leaf-cutting ants may incur costs from cutting and processing leaves with high endophyte loads, which could impact Neotropical forests by causing variable damage rates within plant communities. PMID:20610420

  7. Egg-laying butterflies distinguish predaceous ants by sight.

    Science.gov (United States)

    Sendoya, Sebastián F; Freitas, André V L; Oliveira, Paulo S

    2009-07-01

    Information about predation risks is critical for herbivorous insects, and natural selection favors their ability to detect predators before oviposition and to select enemy-free foliage when offspring mortality risk is high. Food plants are selected by ovipositing butterflies, and offspring survival frequently varies among plants because of variation in the presence of predators. Eunica bechina butterflies oviposit on Caryocar brasiliense, an ant-defended plant. Experiments with dried Camponotus and Cephalotes ants pinned to leaves revealed that butterflies use ant size and form as visual cues to avoid ovipositing on plant parts occupied by ants more likely to kill larval offspring. Presence of sap-sucking bugs did not affect butterfly oviposition. This is the first demonstration that visual recognition of predators can mediate egg-laying decisions by an insect herbivore and that an insect will discriminate among different species of potential predators. This unusual behavioral capability permits specialization on a risky, ant-defended food plant.

  8. ANT International chemistry update and best practices

    International Nuclear Information System (INIS)

    Nordmann, F.; Odar, S.; Venz, H.; Kysela, J.; Ruehle, W.; Riess, R.

    2010-01-01

    There is an increasing number of Nuclear Power Plants (NPP) in various countries. Their chemistry practices are different due to the variety of designs and experiences while in the past the view was more monolithic. This is allowing a very rich experience that is extremely difficult to fully be aware of. ANT International is now collecting and evaluating these data as well as related R and D Information. This allows interested parties to have an easier access to the various sources of information. The chemistry experts associated to ANT International have been gathering a comprehensive detailed view of: The numerous laboratory data gained all over the world during the past decades; The extensive plant operating experiences with various types of chemistry strategies, crosschecked for various types of reactors designs and materials; An experienced international knowledge able to give the comprehensive overview that young engineers now in charge of many other activities are unable to fully cover. This paper gives the core conclusions of the detailed ANT International reports and results that have recently been gathered in the area of chemistry. It particularly covers: The primary water chemistry and its relation with radionuclides, dose rates and fuel behaviour; The secondary water chemistry focusing on its rationale selection depending on materials, design and other constraints; The start up and shutdown chemistry with it large variety of practices hardly understandable even for some experts; and, The maintenance remedies such as decontamination, steam generator cleaning and its alternate options. Various types of Reactor designs (PWR, VVER, BWR, CANDU®) are considered. The different materials, for example the impact of steam generator tubing and its evolution on the secondary water chemistry rationale or on the radioactivity built-up in the primary coolant, are described. The ways to improve the plant operation with a long term reliability as well as the most

  9. The regulation of ant colony foraging activity without spatial information.

    Directory of Open Access Journals (Sweden)

    Balaji Prabhakar

    Full Text Available Many dynamical networks, such as the ones that produce the collective behavior of social insects, operate without any central control, instead arising from local interactions among individuals. A well-studied example is the formation of recruitment trails in ant colonies, but many ant species do not use pheromone trails. We present a model of the regulation of foraging by harvester ant (Pogonomyrmex barbatus colonies. This species forages for scattered seeds that one ant can retrieve on its own, so there is no need for spatial information such as pheromone trails that lead ants to specific locations. Previous work shows that colony foraging activity, the rate at which ants go out to search individually for seeds, is regulated in response to current food availability throughout the colony's foraging area. Ants use the rate of brief antennal contacts inside the nest between foragers returning with food and outgoing foragers available to leave the nest on the next foraging trip. Here we present a feedback-based algorithm that captures the main features of data from field experiments in which the rate of returning foragers was manipulated. The algorithm draws on our finding that the distribution of intervals between successive ants returning to the nest is a Poisson process. We fitted the parameter that estimates the effect of each returning forager on the rate at which outgoing foragers leave the nest. We found that correlations between observed rates of returning foragers and simulated rates of outgoing foragers, using our model, were similar to those in the data. Our simple stochastic model shows how the regulation of ant colony foraging can operate without spatial information, describing a process at the level of individual ants that predicts the overall foraging activity of the colony.

  10. Immune defense in leaf-cutting ants

    DEFF Research Database (Denmark)

    Armitage, Sophie A O; Broch, Jens F; Marín, Hermogenes Fernández

    2011-01-01

    To ameliorate the impact of disease, social insects combine individual innate immune defenses with collective social defenses. This implies that there are different levels of selection acting on investment in immunity, each with their own trade-offs. We present the results of a cross......-fostering experiment designed to address the influences of genotype and social rearing environment upon individual and social immune defenses. We used a multiply mating leaf-cutting ant, enabling us to test for patriline effects within a colony, as well as cross-colony matriline effects. The worker's father influenced...... both individual innate immunity (constitutive antibacterial activity) and the size of the metapleural gland, which secretes antimicrobial compounds and functions in individual and social defense, indicating multiple mating could have important consequences for both defense types. However, the primarily...

  11. Ex-ante Evaluation von Investitionsalternativen

    Directory of Open Access Journals (Sweden)

    Matthias Müller

    2017-12-01

    Full Text Available Der Beitrag zeigt, wie mit Hilfe der Methode der agentenbasierten Modellierung und Simulation (ABMS ein Beitrag zur ex-ante Policy-Beratung geleistet werden kann. Anhand eines exemplarischen Anwendungsfalls, der VISIBLE Simulationsumgebung („Virtual Simulation Lab for the Analysis of Investments in Learning and Education“, diskutieren wir die Konsequenzen unterschiedlicher Kooperationsförderinstrumente für Wissensdiffusionsprozesse in Netzwerken am Beispiel der Region Heilbronn-Franken. Die Simulationsergebnisse zeigen, dass die strukturelle Konfiguration eines regionalen Innovationssystems eine zentrale Bedeutung für die Gestaltung von Kooperationsfördermaßnahmen hat und dass Interventionen, die darauf abzielen, Wissenstransfer zwischen den Akteuren anzuregen, genau die entgegengesetzten Wirkungen entfalten können.

  12. Swarm controlled emergence for ant clustering

    DEFF Research Database (Denmark)

    Scheidler, Alexander; Merkle, Daniel; Middendorf, Martin

    2013-01-01

    .g. moving robots, and clustering algorithms. Design/methodology/approach: Different types of control agents for that ant clustering model are designed by introducing slight changes to the behavioural rules of the normal agents. The clustering behaviour of the resulting swarms is investigated by extensive...... for future research to investigate the application of the method in other swarm systems. Swarm controlled emergence might be applied to control emergent effects in computing systems that consist of many autonomous components which make decentralized decisions based on local information. Practical...... simulation studies. Findings: It is shown that complex behavior can emerge in systems with two types of agents (normal agents and control agents). For a particular behavior of the control agents, an interesting swarm size dependent effect was found. The behaviour prevents clustering when the number...

  13. Discrimination Behavior in the Supercolonial Pharaoh Ant

    DEFF Research Database (Denmark)

    Pontieri, Luigi

    The majority of eusocial insect species live in small, kin structured colonies that are mutually aggressive and rarely interact. By contrast, a restricted group of ant species show a peculiar social organization called unicoloniality, where colonies can grow to vast networks of geographically...... and genetic distance between colony pairs, further confirming the important role of endogenous cues in the nestmate recognition of this species. The third chapter presents a methodological study on the best procedures for identifying chemical compounds used for nestmate recognition in social insects. We first...... evaluated the power of different combinations of data transformation and chemical distance calculation in differentiating between true nestmate recognition (NMR) cues and other compounds. We found that particular combinations of statistical procedures are more effective in differentiating NMR cues from...

  14. 17 años construyendo una idea. Nuestro homenaje al Comandante

    Directory of Open Access Journals (Sweden)

    Luis Estruch-Rancaño

    2016-05-01

    Full Text Available En su ensayo “Nuestra América”, José Martí, expresa “Trincheras de ideas, valen más que trincheras de piedras….” Una idea enérgica, flameada a tiempo, ante el mundo, para, como la bandera mística del juicio final, a un escuadrón de acorazados”

  15. Competencia mediática ante la Agenda Setting: parámetros de actuación a nivel educativo

    Directory of Open Access Journals (Sweden)

    Rosa García-Ruiz

    2013-12-01

    Full Text Available Es necesario formar a los ciudadanos ante la influencia de los medios de comunicación, especialmente en lo referente a la agenda setting, proponiendo la incorporación de la competencia mediática en el curriculum escolar. Lograrlo requiere realizar un esfuerzo por una formación de calidad que garantice el acceso libre, crítico y responsable a la información. Se presenta un análisis de la situación de la agenda setting en Ecuador y una propuesta de educación en medios, desde un enfoque educomunicativo.

  16. Análisis y mejora de una instalación de aire comprimido

    OpenAIRE

    Ruiz Martínez, Álvaro

    2011-01-01

    El cometido de este proyecto es el de analizar, evaluar y actualizar el estado en el que se encuentra la red de aire comprimido de una empresa grande, así como el de realizar propuestas que mejoren su rendimiento. El trabajo encomendado por la empresa ha consistido principalmente en la revisión y actualización de la red de aire comprimido, la generación de una base de datos flexible y versátil sobre la misma ante los continuos cambios que se puedan generar en ella, y la extracc...

  17. La arquitectura moderna en Iberoamérica: una seña de identidad

    OpenAIRE

    González Capitel, Antón

    1996-01-01

    6. La arquitectura moderna en Iberoamérica: una seña de identidad 6. 1. Antes de la arquitectura moderna 6. 2. El Art Déco y los primeros estadios de la arquitectura moderna 6. 2. l. El florecimiento de una primera modernidad en la República del Uruguay 6. 2. 2. Los inicios de la modernidad en la República Argentina 6. 2. 3. Los inicios de la arquitectura moderna en los demás países 6. 3. El desairnllo de la modernidad corbuseriana en Brasil. Brasilia: Costa y Niemeyer ...

  18. Hombre - mujer : dos autores para una misma obra : fotografía de la personalidad

    Directory of Open Access Journals (Sweden)

    Juan Pando Despierto

    1992-01-01

    Full Text Available El conocimiento del hombre por el hombre a través de la imagen es una pregunta inacabada, lógica funcionalidad de una voluntad regenerativa. El arte, esa pregunta universal hacia nuestro propio yo sin imperativos de dominio —lo cual no significa que arte y poder hayan cohabitado férreamente—, se ha limitado a filosofar sobre la condición del hombre ante las sorpresas de la vida y en su compleja relación con los ideales.

  19. Presentación del Libro: Cuasi una Fantasía. Cuentos y Relatos.

    OpenAIRE

    Efraím Otero Ruiz

    2006-01-01

    Meses y varios huesos rotos después puedo, al fin, presentar ante ustedes mi libro de cuentos y relatos, salido de las prensas de Kimpres -con el generoso apoyo de esta Academia desde septiembre del año pasado. Afortunadamente, por tratarse de “Cuasi una fantasía” son narraciones que solo están parcialmente ancladas en el tiempo y comprenden una vivencia de medio siglo, no sólo por los personajes-hoy casi todos desaparecidos- sino por los sucesos, que a veces -aunque tomados ...

  20. Percepción del profesorado sobre concepciones profesionales ante la diversidad cultural escolar

    Directory of Open Access Journals (Sweden)

    Rita María Matencio-López

    2015-01-01

    Full Text Available Se presenta un estudio cuya finalidad ha sido conocer la percepción sobre las concepciones profesionales que poseen los docentes de educación primaria ante la educación intercultural. La diversidad cultural es una característica de nuestra sociedad que se manifiesta en nuestras escuelas, por ello es necesario optar por una educación intercultural como enfoque pedagógico más adecuado para atender dicha realidad, siendo el profesor el agente nuclear para implementar el modelo intercultural. Este estudio se ha realizado a partir de una muestra de 107 profesores de 15 centros de educación primaria (Región de Murcia, España. Se ocupó un planteamiento metodológico descriptivo de corte cuantitativo y de tipo encuesta, además de un cuestionario (escala Likert como instrumento para recoger información. El estudio revela que existen múltiples formas de entender y acometer la educación intercultural, según la perspectiva de los docentes, desde las aulas y los centros, con diferentes aspectos problemáticos y controvertidos.

  1. Uso del Instrumento Militar en la Política Antártica – Elementos para el Análisis y su Aplicación en el Caso de Argentina

    Directory of Open Access Journals (Sweden)

    Gabriel De Paula

    2009-05-01

    Full Text Available En la mayor parte de los países con intereses en la Antártida, las Fuerzas Armadas (el instrumento militar realizan funciones logísticas, como el abastecimiento o el movimiento de personal. Incluso, en algunos países, como en Argentina, la campaña antártica es planificada por las Fuerzas Armadas. Por otro lado, en algunos casos, encontramos en la Antártida países donde las Fuerzas Armadas pueden desarrollar, además de la función logística, una función que denominaremos "ocupación efectiva". Esta última está relacionada a las reclamaciones de soberanía en suspenso por el Tratado Antártico. Se estudian ambas funciones desde el marco jurídico del sistema del Tratado Antártico y desde los ejemplos de la política antártica de algunos países. En particular, dada la superposición de áreas reclamadas, se analizarán componentes de la política antártica argentina, chilena y británica. En el plano específicamente militar, se desarrollan aspectos del diseño de fuerzas para llevar a cabo las misiones en la campaña antártica. Estos son: adaptación, especialización y preparación. Los tres conceptos tienen que ver con las capacidades necesarias para operar en el ambiente antártico. Se realiza también una breve mención a la cooperación militar en el plano logístico. Por último, se lleva a cabo una comparación entre las relaciones internacionales en el Ártico y las "relaciones antárticas", dado que hay actores (como Rusia y EE.UU. con intereses en ambos polos.

  2. Antes, durante y después de un incendio forestal (Before, During, and After a Wildfire)

    Centers for Disease Control (CDC) Podcasts

    Cada vez más personas construyen sus hogares en lugares boscosos, ya sea dentro o cerca de bosques, áreas rurales o sitios remotos en las montañas. Estas áreas son más propensas a los incendios forestales. Los incendios forestales a menudo comienzan en forma inadvertida, pero se extienden rápidamente, y prenden a su paso maleza, árboles y casas. Los CDC recomiendan tomar una serie de medidas antes, durante y después de un incendio forestal local, a fin contrarrestar sus efectos negativos.

  3. Actitud ante la inmigración en estudiantes de enfermería: Valoración antes y después del 11-M

    Directory of Open Access Journals (Sweden)

    Montserrat Antonín Martín

    Full Text Available El fenómeno de la inmigración ha experimentado en nuestro país un importante cambio cuantitativo que ha llevado a triplicar el número de inmigrantes registrados en los últimos tres años. El hecho de que ciertos colectivos de inmigrantes se hayan vinculado a actos y organizaciones terroristas ha sugerido la idea de un posible deterioro de la actitud hacia los inmigrantes por parte de la población española. Los objetivos de este trabajo fueron realizar, mediante un estudio descriptivo transversal, una comparación entre las puntuaciones obtenidas en la Escala de Actitud ante la Inmigración en una muestra accidental de 204 estudiantes de enfermería que respondieron a la escala en febrero de 2003 y abril de 2004. Los resultados obtenidos permiten concluir que la actitud hacia la inmigración en los estudiantes es significativamente más positiva en el curso 2003-04 que en el curso anterior (p<0,05, lo que se interpreta en términos de eficacia del énfasis docente en el principio de equidad hacia todos los usuarios, independientemente de su etnia o cultura.

  4. Entomopathogens Isolated from Invasive Ants and Tests of Their Pathogenicity

    Directory of Open Access Journals (Sweden)

    Maria Fernanda Miori de Zarzuela

    2012-01-01

    Full Text Available Some ant species cause severe ecological and health impact in urban areas. Many attempts have been tested to control such species, although they do not always succeed. Biological control is an alternative to chemical control and has gained great prominence in research, and fungi and nematodes are among the successful organisms controlling insects. This study aimed to clarify some questions regarding the biological control of ants. Invasive ant species in Brazil had their nests evaluated for the presence of entomopathogens. Isolated entomopathogens were later applied in colonies of Monomorium floricola under laboratory conditions to evaluate their effectiveness and the behavior of the ant colonies after treatment. The entomopathogenic nematodes Heterorhabditis sp. and Steinernema sp. and the fungi Beauveria bassiana, Metarhizium anisopliae, and Paecilomyces sp. were isolated from the invasive ant nests. M. floricola colonies treated with Steinernema sp. and Heterorhabditis sp. showed a higher mortality of workers than control. The fungus Beauveria bassiana caused higher mortality of M. floricola workers. However, no colony reduction or elimination was observed in any treatment. The defensive behaviors of ants, such as grooming behavior and colony budding, must be considered when using fungi and nematodes for biological control of ants.

  5. The diversity of microorganisms associated with Acromyrmex leafcutter ants

    Directory of Open Access Journals (Sweden)

    Boomsma Jacobus J

    2002-05-01

    Full Text Available Abstract Background Molecular biological techniques are dramatically changing our view of microbial diversity in almost any environment that has so far been investigated. This study presents a systematic survey of the microbial diversity associated with a population of Acromyrmex leafcutter ants. In contrast to previous studies on social insects, which targeted specific groups of symbionts occurring in the gut (termites, Tetraponera ants or in specialised cells (Camponotus ants the objective of our present study was to do a total screening of all possible micro-organisms that can be found inside the bodies of these leafcutter ants. Results We amplified, cloned and sequenced SSU rRNA encoding gene fragments from 9 microbial groups known to have insect-associated representatives, and show that: (1 representatives of 5 out of 9 tested groups are present, (2 mostly several strains per group are present, adding up to a total of 33 different taxa. We present the microbial taxa associated with Acromymex ants in a phylogenetic context (using sequences from GenBank to assess and illustrate to which known microorganisms they are closely related. The observed microbial diversity is discussed in the light of present knowledge on the evolutionary history of Acromyrmex leafcutter ants and their known mutualistic and parasitic symbionts. Conclusions The major merits of the screening approach documented here is its high sensitivity and specificity, which allowed us to identify several microorganisms that are promising candidates for further study of their interactions with Acromyrmex leafcutter ants or their gardens.

  6. USING ANT COMMUNITIES FOR RAPID ASSESSMENT OF TERRESTRIAL ECOSYSTEM HEALTH

    Energy Technology Data Exchange (ETDEWEB)

    Wike, L; Doug Martin, D; Michael Paller, M; Eric Nelson, E

    2007-01-12

    Ecosystem health with its near infinite number of variables is difficult to measure, and there are many opinions as to which variables are most important, most easily measured, and most robust, Bioassessment avoids the controversy of choosing which physical and chemical parameters to measure because it uses responses of a community of organisms that integrate all aspects of the system in question. A variety of bioassessment methods have been successfully applied to aquatic ecosystems using fish and macroinvertebrate communities. Terrestrial biotic index methods are less developed than those for aquatic systems and we are seeking to address this problem here. This study had as its objective to examine the baseline differences in ant communities at different seral stages from clear cut back to mature pine plantation as a precursor to developing a bioassessment protocol. Comparative sampling was conducted at four seral stages; clearcut, 5 year, 15 year and mature pine plantation stands. Soil and vegetation data were collected at each site. All ants collected were preserved in 70% ethyl alcohol and identified to genus. Analysis of the ant data indicates that ants respond strongly to the habitat changes that accompany ecological succession in managed pine forests and that individual genera as well as ant community structure can be used as an indicator of successional change. Ants exhibited relatively high diversity in both early and mature seral stages. High ant diversity in the mature seral stages was likely related to conditions on the forest floor which favored litter dwelling and cool climate specialists.

  7. Interactions Increase Forager Availability and Activity in Harvester Ants.

    Directory of Open Access Journals (Sweden)

    Evlyn Pless

    Full Text Available Social insect colonies use interactions among workers to regulate collective behavior. Harvester ant foragers interact in a chamber just inside the nest entrance, here called the 'entrance chamber'. Previous studies of the activation of foragers in red harvester ants show that an outgoing forager inside the nest experiences an increase in brief antennal contacts before it leaves the nest to forage. Here we compare the interaction rate experienced by foragers that left the nest and ants that did not. We found that ants in the entrance chamber that leave the nest to forage experienced more interactions than ants that descend to the deeper nest without foraging. Additionally, we found that the availability of foragers in the entrance chamber is associated with the rate of forager return. An increase in the rate of forager return leads to an increase in the rate at which ants descend to the deeper nest, which then stimulates more ants to ascend into the entrance chamber. Thus a higher rate of forager return leads to more available foragers in the entrance chamber. The highest density of interactions occurs near the nest entrance and the entrances of the tunnels from the entrance chamber to the deeper nest. Local interactions with returning foragers regulate both the activation of waiting foragers and the number of foragers available to be activated.

  8. Competitive assembly of South Pacific invasive ant communities

    Directory of Open Access Journals (Sweden)

    Sarty Megan

    2009-01-01

    Full Text Available Abstract Background The relative importance of chance and determinism in structuring ecological communities has been debated for nearly a century. Evidence for determinism or assembly rules is often evaluated with null models that randomize the occurrence of species in particular locales. However, analyses of the presence or absence of species ignores the potential influence of species abundances, which have long been considered of major importance on community structure. Here, we test for community assembly rules in ant communities on small islands of the Tokelau archipelago using both presence-absence and abundance data. We conducted three sets of analyses on two spatial scales using three years of sampling data from 39 plots on 11 islands. Results First, traditional null model tests showed support for negative species co-occurrence patterns among plots within islands, but not among islands. A plausible explanation for this result is that analyses at larger spatial scales merge heterogeneous habitats that have considerable effects on species occurrences. Second, analyses of ant abundances showed that samples with high ant abundances had fewer species than expected by chance, both within and among islands. One ant species, the invasive yellow crazy ant Anoplolepis gracilipes, appeared to have a particularly strong effect on community structure correlated with its abundance. Third, abundances of most ant species were inversely correlated with the abundances of all other ants at both spatial scales. This result is consistent with competition theory, which predicts species distributions are affected by diffuse competition with suites of co-occurring species. Conclusion Our results support a pluralistic explanation for ant species abundances and assembly. Both stochastic and deterministic processes interact to determine ant community assembly, though abundance patterns clearly drive the deterministic patterns in this community. These deterministic

  9. Peste en una ciudad novohispana. El matlazahuatl de 1737 en la Puebla de los Ángeles

    Directory of Open Access Journals (Sweden)

    Cuenya, Miguel Ángel

    1996-12-01

    Full Text Available Not available.

    En 1737-1738 la Nueva España se vio sacudida por la peste. Mortífera enfermedad denominada con el nombre de “matlazahuatl”, que atacaba sin distinción de edad, sexo, grupo étnico o económico, ocasionando estragos difíciles de olvidar y consecuencias económicas, demográficas y sociales que perduraban durante largo tiempo. En Puebla, como en todo centro urbano colonial, sus habitantes estaban acostumbrados a convivir diariamente con la muerte, y desde la fundación de la ciudad diversas pandemias y epidemias habían afectado a su población. A pesar de ello, los poblanos no recordaban una enfermedad tan letal como el matlazahuatl, que ocasionara un número tan elevado de víctimas, ya que en sólo ocho meses se registró el entierro de 7.167 personas adultas (15% de su población. A diferencia de la viruela, el sarampión y otras enfermedades, la peste superó barreras étnicas y socioeconómicas: indígenas y castas fueron los grupos que sintieron con mayor intensidad los efectos de la terrible enfermedad y el golpe fue tan severo que las consecuencias se sintieron durante muchos años, mientras que mestizos y españoles se recuperaron rápidamente.

  10. Evolution of Fungal enzymes in the attine ant symbiosis

    DEFF Research Database (Denmark)

    de Fine Licht, Henrik Hjarvard; Schiøtt, Morten; Boomsma, Jacobus Jan

    The attine ant symbiosis is characterized by ancient but varying degrees of diffuse co-evolution between the ants and their fungal cultivars. Domesticated fungi became dependent on vertical transmission by queens and the ant colonies came to rely on their symbiotic fungus for food and thus...... as garden substrate, whereas the more basal genera use leaf litter, insect feces and insect carcasses. We hypothesized that enzyme activity of fungal symbionts has co-evolved with substrate use and we measured enzyme activities of fungus gardens in the field to test this, focusing particularly on plant...... essential for the symbiosis in general, but have contributed specifically to the evolution of the symbiosis....

  11. Comparative studies of the secretome of fungus-growing ants

    DEFF Research Database (Denmark)

    Linde, Tore; Grell, Morten Nedergaard; Schiøtt, Morten

    2009-01-01

    Leafcutter ants of the species Acromyrmex echinatior live in symbiosis with the fungus Leucoagaricus gongylophorus. The ants harvest fragments of leaves and carry them to the nest where they place the material on the fungal colony. The fungus secretes a wide array of proteins to degrade the leaves...... into nutrients that the ants can feed on. The focus of this study is to discover, characterize and compare the secreted proteins. In order to do so cDNA libraries are constructed from mRNA extracted from the fungus material. The most efficient technology to screen cDNA libraries selectively for secreted...

  12. Warehouse stocking optimization based on dynamic ant colony genetic algorithm

    Science.gov (United States)

    Xiao, Xiaoxu

    2018-04-01

    In view of the various orders of FAW (First Automotive Works) International Logistics Co., Ltd., the SLP method is used to optimize the layout of the warehousing units in the enterprise, thus the warehouse logistics is optimized and the external processing speed of the order is improved. In addition, the relevant intelligent algorithms for optimizing the stocking route problem are analyzed. The ant colony algorithm and genetic algorithm which have good applicability are emphatically studied. The parameters of ant colony algorithm are optimized by genetic algorithm, which improves the performance of ant colony algorithm. A typical path optimization problem model is taken as an example to prove the effectiveness of parameter optimization.

  13. Ant colony algorithm for clustering in portfolio optimization

    Science.gov (United States)

    Subekti, R.; Sari, E. R.; Kusumawati, R.

    2018-03-01

    This research aims to describe portfolio optimization using clustering methods with ant colony approach. Two stock portfolios of LQ45 Indonesia is proposed based on the cluster results obtained from ant colony optimization (ACO). The first portfolio consists of assets with ant colony displacement opportunities beyond the defined probability limits of the researcher, where the weight of each asset is determined by mean-variance method. The second portfolio consists of two assets with the assumption that each asset is a cluster formed from ACO. The first portfolio has a better performance compared to the second portfolio seen from the Sharpe index.

  14. Automating ActionScript Projects with Eclipse and Ant

    CERN Document Server

    Koning, Sidney

    2011-01-01

    Automating repetitive programming tasks is easier than many Flash/AS3 developers think. With the Ant build tool, the Eclipse IDE, and this concise guide, you can set up your own "ultimate development machine" to code, compile, debug, and deploy projects faster. You'll also get started with versioning systems, such as Subversion and Git. Create a consistent workflow for multiple machines, or even complete departments, with the help of extensive Ant code samples. If you want to work smarter and take your skills to a new level, this book will get you on the road to automation-with Ant. Set up y

  15. The invasion biology and sociogenetics of pharaoh ants

    DEFF Research Database (Denmark)

    Schmidt, Anna Mosegaard

    Social insect colonies perform a number of tasks affecting the environments they live in. Some unintentionally introduced species have attracted the attention of scientists and general public alike when causing a number of changes to the composition and functioning of ecosystems. Such ?invaders...... laboratory lineages, thus building the foundation for future research on the species. In addition, I have started a selection experiment (still ongoing in collaboration with Dr. T. Linksvayer) using pharaoh ants, which is the first time artificial selection is attempted in an ant species. Pharaoh ants have...

  16. La comunicación ante la convergencia digital: algunas fortalezas y debilidades

    Directory of Open Access Journals (Sweden)

    José Alberto García Avilés

    2009-01-01

    Full Text Available La convergencia de medios es un proceso facilitado por la implantación generalizada de las tecnologías digitales de la telecomunicación, que afecta aspectos muy diversos y propicia una integración de herramientas, espacios, métodos de trabajo y lenguajes anteriormente disgregados. La convergencia se desarrolla, al menos, en cinco ámbitos: tecnológico, empresarial, de los contenidos, de los usuarios y de los profesionales de los medios. El artículo analiza distintas fortalezas y debilidades que afronta el sector de la comunicación ante el desarrollo de la convergencia digital en cada uno de estos cinco ámbitos. Finalmente, las recomendaciones apuestan por mantener y fortalecer los contenidos de servicio público, interés general y acceso universal en el escenario de convergencia.

  17. La electricidad antes de Faraday. Parte 1

    Directory of Open Access Journals (Sweden)

    Gabriel Poveda Ramos

    2003-01-01

    Full Text Available Este documento es una monografía sobre el surgimiento y el desarrollo de la ciencia de la electricidad desde la remota antigüedad hasta la época de Michael Faraday, a comienzos del siglo XIX. Está escrito con el propósito de reunirlo con otro que el autor ya escribió sobre la historia del magnetismo durante el mismo período.

  18. ¿...y antes de los MOOC?

    Directory of Open Access Journals (Sweden)

    Lorenzo García Aretio

    2015-12-01

    Full Text Available El fenómeno MOOC (Massive Open Online Courses ha sobrepasado el interés del mundo académico para instalarse en la sociedad como un argumento democratizador de la educación. Pero los MOOC no han surgido por generación espontánea, como pudiera deducirse de tanta literatura vertida en estos tres últimos años. Para probar que los MOOC han supuesto, no una ruptura, sino una evolución de la educación a distancia, realizamos una revisión de la literatura más relevante que viene a marcar los hitos de la evolución histórica de esta modalidad educativa. Así, los cuatro términos insertos en el acrónimo MOOC (curso, masivo, abierto y en línea, no surgieron en 2011, fecha de la emergencia de los MOOC, sino que fueron apareciendo dinámicamente a lo largo de la historia de la educación a distancia.

  19. EL CONFLICTO COLOMBIANO ANTE LA COMUNIDAD INTERNACIONAL

    Directory of Open Access Journals (Sweden)

    Roberto González Arana

    2001-01-01

    Full Text Available El concepto de Potencial Científico incluye la investigación fundamental, la aplicada y el desarrollo. Sin embargo, no puede ser examinado sólo desde el ángulo de los indicadores cuantitativos, sino que es fundamental examinarlo también desde el punto de vista cualitativo. Uno de los factores más importantes que se debe analizar es la cadena ciencia - producción. En su análisis, se tratan temas como la interacción ciencia - técnica - producción y la influencia que la tecnología ejerce sobre las estructuras sociales, sobre su cultura y sus concepciones ideológicas. Sin embargo, se hace claridad sobre la no identidad del progreso tecnológico y el progreso social, siendo el primero una condición necesaria, pero no suficiente, para que haya progreso social. En su segunda parte, el artículo incluye una discusión acerca del potencial científico y el rendimiento de la ciencia, y finaliza con una serie de inquietudes sobre Latinoamérica y los conceptos estudiados.

  20. una sociedad emergente

    Directory of Open Access Journals (Sweden)

    Derlisiret Rincón M.

    2006-01-01

    Full Text Available Este trabajo busca reflexionar por una parte acerca del papel de la ciencia, la tecnología y la educación, como factores de desarrollo de las naciones e intenta responder la interrogante en torno al cómo estas variables contribuirán a la transformación de la realidad social venezolana. Los planteamientos expuestos en este artículo forman parte de una investigación cualitativa que se sustenta en una revisión teórica cuyos resultados indican que existe la posibilidad cierta de construir y alcanzar una Venezuela virtual en los próximos años; es decir, se vislumbra un país interconectado y funcionando a través de redes cuyos individuos estarían capacitados y entrenados en el uso y usufructo de las nuevas tecnologías. Esta visión de país, se basa en la premisa de que la oportuna implementación de la Planificación de Ciencia y Tecnología resultaría instrumento de vinculación de las variables tecnológicas, educativas y científicas, que permiten obtener conocimientos especializados y orientados a la solución de problemas de creciente dimensión global. Tales conocimientos, pudieran generar los cambios sustanciales necesarios en el contexto nacional, para lograr modificar o disminuir el sentido de crecimiento de la brecha o divisoria digital en este entorno

  1. CRIPTOSPORIDIOSIS: UNA ZOONOSIS PARASITARIA

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    Claudia Vergara

    2004-07-01

    Full Text Available La criptosporidiosis es una enfermedad parasitariaproducida por protozoos coccidios pertenecientes algénero Cryptosporidium. Su importancia se puso demanifiesto a comienzos de los años 1980 por lo quepuede considerarse una patología de conocimientorelativamente reciente, aunque actualmente se hademostrado que es una de las infecciones entéricasmás frecuentes en humanos y animales y un problemade salud pública en todo el mundo (Casemore et al.1997. La especie de mayor interés dentro del género,y a la cual nos referiremos a lo largo de esta revisión,es C. parvum, que se multiplica preferentemente enlas células epiteliales del intestino delgado de losmamíferos desencadenando diarrea por absorción ydigestión deficientes y que debido a su escasaespecificidad de hospedador, puede transmitirseindistintamente entre los mamíferos domésticos y elhombre

  2. Hacia una vejez útil

    Directory of Open Access Journals (Sweden)

    Hernández Amparo

    1992-12-01

    Full Text Available

    Con lleva un interés bien particular encontrarnos con una población tan heterogénea en cuanto a caracterización se refiere, ya porque miremos en ella sus hábitos, sus costumbres, procedencia, nivel socio-cultural, etc., dicha comunidad de ancianos plantea, de inmediato la necesidad de ponerse en un contacto generacional que rompiera y dejara atrás la rutina y la monotonía, propia de su cotidianidad, es entonces cuando tres profesionales altamente motivadas en el trabajo comunitario, inician un proceso vivo y dinámico con el anciano institucionalizado a fin de que ellos recobraran el protagonismo, elevaran su autoestima, tomaran parte en la toma de decisiones frente a su vida, y volvieran a sentirse en capacidad de dar respuesta a sus conflictos, buscando alternativas de solución en una tarea mancomunada que exigió madurez, diálogo y comunicación permanente entre cada una de las partes involucradas en dicho proceso.

  3. Symbiotic mutualism with a community of opportunistic ants: protection, competition, and ant occupancy of the myrmecophyte Barteria nigritana (Passifloraceae)

    Science.gov (United States)

    Djiéto-Lordon, Champlain; Dejean, Alain; Gibernau, Marc; Hossaert-McKey, Martine; McKey, Doyle

    2004-10-01

    Barteria nigritana is a myrmecophyte tree of Lower Guinea coastal vegetation. Unlike the more specialised B. fistulosa, which harbours a single host-specific mutualistic ant, B. nigritana is associated with several opportunistic ants. Such symbiotic, yet opportunistic, ant-plant associations have been little studied. On 113 clumps of B. nigritana, we censused ant associates and herbivores and compared herbivory on plants occupied by different ants. In addition to these correlative data, protection conferred by different ant species was compared by herbivore-placement experiments. Identity of ant associate changed predictably over plant ontogeny. Pheidole megacephala was restricted to very small plants; saplings were occupied by either Oecophylla longinoda or Crematogaster sp., and the latter species was the sole occupant of larger trees. Damage by caterpillars of the nymphalid butterfly Acraea zetes accounted for much of the herbivory to leaves. Ant species differed in the protection provided to hosts. While P. megacephala provided no significant protection, plants occupied by O. longinoda and Crematogaster sp. suffered less damage than did unoccupied plants or those occupied by P. megacephala. Furthermore, O. longinoda provided more effective protection than did Crematogaster sp. Herbivore-placement experiments confirmed these results. Workers of O. longinoda killed or removed all larval instars of A. zetes. Crematogaster preyed on only the two first larval instars, and P. megacephala preyed mainly on eggs, only rarely attacking the two first larval instars. Opportunistic ants provided significant protection to this relatively unspecialised myrmecophyte. The usual associate of mature trees was not the species that provided most protection.

  4. Percepción del clima social familiar y actitudes ante el acoso escolar en adolescentes

    Directory of Open Access Journals (Sweden)

    María de la Villa Moral Jiménez

    2013-08-01

    Full Text Available La implicación de los factores familiares en la problemática del acoso escolar entre iguales está suficientemente documentada, no solo en lo relativo a los distintos perfiles diferenciales que presentan los bullies y sus víctimas en lo referente a los estilos socializadores paternos, sino por las implicaciones que se derivan de la percepción del clima familiar. En concreto, en este estudio se ofrece un análisis psicosocial de la vinculación entre la percepción del clima social familiar por parte de un colectivo de 550 adolescentes del Principado de Asturias (278 chicas, 50.5% y 272 chicos, 49.5% y sus actitudes ante el acoso escolar de acuerdo con un modelo de evaluación tridimensional (planos cognitivo, afectivo y disposicional medidas a través de la Escala de actitudes ante la agresión social construida ad hoc por los autores (Moral, 2005. Se ha confirmado que los adolescentes que presentan actitudes más favorables a la violencia entre iguales perciben un clima familiar más conflictivo, sienten menor afecto en las relaciones familiares, manifiestan una mayor dificultad para comunicarse con ellos, así como un menor respeto hacia sus opiniones y un mayor nivel de exigencia paterna y declaran ser objeto de castigo físico y psicológico por parte de sus padres en comparación con aquellos adolescentes que presentan unas actitudes más negativas hacia la violencia bullying.

  5. Integración de un sistema de pago para móvil mediante un intermediario para una aplicación WAP

    OpenAIRE

    Paradell Cases, David

    2012-01-01

    Nou sistema de pagament per mòbil. [ANGLÈS] Integration of a mobile payment system using Mobile 365 company to a WAP application. [CASTELLÀ] Integración de un sistema de pago para móvil mediante Mobile 365 para una aplicación WAP. [CATALÀ] Integració d'un sistema de pagament per mòbil mitjançant Mobile 365 per a una aplicació WAP.

  6. Selenium exposure results in reduced reproduction in an invasive ant species and altered competitive behavior for a native ant species

    International Nuclear Information System (INIS)

    De La Riva, Deborah G.; Trumble, John T.

    2016-01-01

    Competitive ability and numerical dominance are important factors contributing to the ability of invasive ant species to establish and expand their ranges in new habitats. However, few studies have investigated the impact of environmental contamination on competitive behavior in ants as a potential factor influencing dynamics between invasive and native ant species. Here we investigated the widespread contaminant selenium to investigate its potential influence on invasion by the exotic Argentine ant, Linepithema humile, through effects on reproduction and competitive behavior. For the fecundity experiment, treatments were provided to Argentine ant colonies via to sugar water solutions containing one of three concentrations of selenium (0, 5 and 10 μg Se mL −1 ) that fall within the range found in soil and plants growing in contaminated areas. Competition experiments included both the Argentine ant and the native Dorymyrmex bicolor to determine the impact of selenium exposure (0 or 15 μg Se mL −1 ) on exploitation- and interference-competition between ant species. The results of the fecundity experiment revealed that selenium negatively impacted queen survival and brood production of Argentine ants. Viability of the developing brood was also affected in that offspring reached adulthood only in colonies that were not given selenium, whereas those in treated colonies died in their larval stages. Selenium exposure did not alter direct competitive behaviors for either species, but selenium exposure contributed to an increased bait discovery time for D. bicolor. Our results suggest that environmental toxins may not only pose problems for native ant species, but may also serve as a potential obstacle for establishment among exotic species. - Highlights: • Argentine ant colonies exposed to selenium had reduced fecundity compared to unexposed colonies. • Viability of offspring was negatively impacted by selenium. • Queen survival was reduced in colonies

  7. Una metropolitana chiamata "tram"

    Directory of Open Access Journals (Sweden)

    Mariella Zoppi

    2012-08-01

    Full Text Available Perché il caso-Firenze della tramvia ha avuto un rilievo così forte sui media nazionali? Perché la tramvia (se vogliamo continuare a chiamare così una metropolitana di superficie è parte di un sovvertimento dei valori storici, estetici ed economici della città di cui il sistema di trasporto è solo un frammento. La grande operazione di trasformazione, come viene chiamata dall’Amministrazione comunale, passa per il cambiamento di destinazione e la nuova edificazione di molte aree urbane: dall’area Fiat e da quella dell’ex-officine ferroviarie di Porta a Prato (ormai in fase conclusiva, dall’avvio dell’edificazione privata a Castello (vicenda nota negli anni Ottanta come “Fondiaria” a quelle di aree di minori dimensioni che interessano ex-cinema o teatri (è di questi giorni il destino dell’attuale Teatro comunale che si mutano in abitazioni pregiate o di fabbriche dismesse che si trasformano, con il loro carico volumetrico pressoché intatto (a pareggiare i conti ci pensa la “perequazione”, in parcheggi in struttura (semi-vuoti perché mal collocati, residenze, uffici, alberghi e quant’altro possa essere “utile” ad una città invecchiata che ha perso, centomila abitanti fra il 1971 ed il 2001, passando da una popolazione di 457.803 a una di 356.118. Come nel resto del Paese, anche a Firenze, non esiste più un dibattito pubblico che riporti gli umori della città all’interno delle vicende politiche e amministrative, e dunque tutto avviene fra l’indifferenza delle cronache locali che sembrano più interessate alle dichiarazioni di questo o quel personaggio che alla effettiva trasmissione delle informazioni. Le notizie circolano sulla rete, veicolate dai comitati (ormai c’è un comitato di cittadini per ogni strada o problema, che vive separatamente dagli amministratori e diventano patrimonio di quanti abbiano una sia pur minima alfabetizzazione informatica.

  8. The introduction history of invasive garden ants in Europe: integrating genetic, chemical and behavioural approaches

    DEFF Research Database (Denmark)

    Ugelvig, Line; Drijfhout, Falko; Kronauer, Daniel

    2008-01-01

    BACKGROUND: The invasive garden ant, Lasius neglectus, is the most recently detected pest ant and the first known invasive ant able to become established and thrive in the temperate regions of Eurasia. In this study, we aim to reconstruct the invasion history of this ant in Europe analysing 14 po...

  9. Stealthy invaders: the biology of Cardiocondyla tramp ants

    DEFF Research Database (Denmark)

    Heinze, J.; Cremer, Sylvia; Eckl, N.

    2006-01-01

    Many invasive ant species, such as the Argentine ant or the red imported fire ant, have huge colonies with thousands of mass-foraging workers, which quickly monopolise resources and therefore represent a considerable threat to the native ant fauna. Cardiocondyla obscurior and several other specie...

  10. Nueva Guinea ante la Autonomía Regional, un desafío pendiente

    Directory of Open Access Journals (Sweden)

    Claribel del Rosario Castillo Úbeda

    2012-09-01

    Full Text Available La Autonomía Regional de la Costa Caribe de Nicaragua es una temática abordada desde el enfoque de las representaciones sociales que permite conocer de que manera la población de Nueva Guinea, percibe el régimen autonómico; asimismo la identificación de posibles estrategias de definición política y administrativa de este territorio mestizo, que según la Ley 137 es parte de la Región Autónoma Atlántico Sur −RAAS−, no obstante desde el Estatuto de de las Regiones de la Costa Atlántica de Nicaragua y su Reglamento en el artículo 42, no hubo claridad en su jurisdicción.El diseño de investigación tuvo un enfoque cualitativo, de corte transversal, cuyos instrumentos de recopilación de información fueron entrevistas individuales y grupales, con representatividad de todos los sectores sociales y políticos.Se Identificaron diferentes apreciaciones relativas a la conceptualización y sentido de inclusión al régimen autonómico, que puede resumirse en dos posiciones. Una quienes han visto en la autonomía una oportunidad para que el municipio alcance mayores niveles de desarrollo si se integra a la región con los derechos establecidos en la Ley No. 28, y otra, quienes han pensado en una salida que implica la conformación de una nueva Región Autónoma.También se aportan elementos a las autoridades y organizaciones de la Sociedad Civil sobre el sentir de la población respecto a esta situación Los hallazgos sugieren que la población necesita mayor divulgación de la Ley para el conocimiento de sus contenidos, y a partir de ello realizar una consulta amplia a sus habitantes antes de definir el futuro de este municipio. También se ha demandado urgentemente una respuesta clara a la indefinición política – administrativa. 

  11. El ECTS y una Universidad que aprende

    Directory of Open Access Journals (Sweden)

    Mª Dolores BAENA CUADRADO

    2005-01-01

    Full Text Available El proceso de Convergencia Europea que está viviendo la Universidad Española, trae consigo una adaptación del sistema de créditos que se centra en el trabajo del alumnado, para definir los programas de estudio. Esto supone, entre otros aspectos, un replanteamiento de las metodologías utilizadas por el profesorado y, por tanto, un cambio en la concepción del proceso de enseñanza y aprendizaje en la Educación Superior. Ante este reto, es necesario conocer cuál es la situación actual de la práctica educativa universitaria. Presentamos los primeros resultados de un estudio exploratorio realizado en la Universidad de La Laguna, con la intención de contrastar la realidad actual con las demandas planteadas desde el modelo de Bolonia para la creación del Espacio Europeo de Educación Superior.

  12. FMR measurements in fire ants: evidence of magnetic material

    Energy Technology Data Exchange (ETDEWEB)

    Esquivel, Darci M.S.; Acosta-Avalos, Daniel; El-Jaick, Lea J.; Cunha, Alexandra D.M.; Malheiros, Maria G.; Wajnberg, Eliane [Centro Brasileiro de Pesquisas Fisicas (CBPF), Rio de Janeiro, RJ (Brazil); Linhares, Marilia P. [Centro de Ciencias do Estado, do Rio de Janeiro, Rio de Janeiro, RJ (Brazil)

    1998-01-01

    Based on the behavioral and the localization of iron-containing tissue fire ants were examined by EPR for magnetic material. Results suggest the presence of magnetite particles. (author) 12 refs., 1 fig.

  13. Disease dynamics in a specialized parasite of ant societies.

    Directory of Open Access Journals (Sweden)

    Sandra B Andersen

    Full Text Available Coevolution between ant colonies and their rare specialized parasites are intriguing, because lethal infections of workers may correspond to tolerable chronic diseases of colonies, but the parasite adaptations that allow stable coexistence with ants are virtually unknown. We explore the trade-offs experienced by Ophiocordyceps parasites manipulating ants into dying in nearby graveyards. We used field data from Brazil and Thailand to parameterize and fit a model for the growth rate of graveyards. We show that parasite pressure is much lower than the abundance of ant cadavers suggests and that hyperparasites often castrate Ophiocordyceps. However, once fruiting bodies become sexually mature they appear robust. Such parasite life-history traits are consistent with iteroparity--a reproductive strategy rarely considered in fungi. We discuss how tropical habitats with high biodiversity of hyperparasites and high spore mortality has likely been crucial for the evolution and maintenance of iteroparity in parasites with low dispersal potential.

  14. Sperm length evolution in the fungus-growing ants

    DEFF Research Database (Denmark)

    Baer, B.; Dijkstra, M. B.; Mueller, U. G.

    2009-01-01

    -growing ants, representing 9 of the 12 recognized genera, and mapped these onto the ant phylogeny. We show that average sperm length across species is highly variable and decreases with mature colony size in basal genera with singly mated queens, suggesting that sperm production or storage constraints affect...... the evolution of sperm length. Sperm length does not decrease further in multiply mating leaf-cutting ants, despite substantial further increases in colony size. In a combined analysis, sexual dimorphism explained 63.1% of the variance in sperm length between species. As colony size was not a significant...... predictor in this analysis, we conclude that sperm production trade-offs in males have been the major selective force affecting sperm length across the fungus-growing ants, rather than storage constraints in females. The relationship between sperm length and sexual dimorphism remained robust...

  15. Myrmeciza and related antbirds (Aves, Formicariidae as army ant followers

    Directory of Open Access Journals (Sweden)

    Edwin O. Willis

    1984-01-01

    Full Text Available Antbirds of the genera Myrmeciza (including Sipia and Myrmoborus, Gymnocichla, and Sclateria hop near or on the ground in fairly dense vegetation, "pounding" their tails downward. Where dense understory vegetation is widespread and ants move in it for long distances, certain of these antbirds become regular ant followers: M. immaculata and M. fortis in cluttered moist foothill forest from Costa Rica to upper Amazonia; Gymnocichla nudiceps in moist cluttered second growth of Central America to Colombia. Where the forest understory is more open, Myrmeciza species follow ants mainly in cluttered patches: M. exsul in lowland forest west of the Andes, M. myotherina east of the Andes. Myrmeciza or relatives that specialize on water-edge or very dense zones rarely follow ants.

  16. Ants farm subterranean aphids mostly in single clone groups

    DEFF Research Database (Denmark)

    Ivens, Aniek B.F.; Kronauer, Daniel Jan Christoph; Pen, Ido

    2012-01-01

    mutualisms have been studied in sufficient genetic detail to address these issues, so we decided to characterize symbiont diversity in the complex mutualism between multiple root aphid species and Lasius flavus ants. After showing elsewhere that three of these aphid species have low dispersal and mostly...... if not exclusively asexual reproduction, we here investigate aphid diversity within and between ant nest mounds. Results The three focal species (Geoica utricularia, Forda marginata and Tetraneura ulmi) had considerable clonal diversity at the population level. Yet more than half of the ant mounds contained just....... The ants appear to eat most of the early instar aphids, so that adult aphids are unlikely to face limited phloem resources and scramble competition with other aphids. We suggest that such culling of carbohydrate-providing symbionts for protein ingestion may maintain maximal host yield per aphid while also...

  17. Ant groups optimally amplify the effect of transiently informed individuals

    Science.gov (United States)

    Gelblum, Aviram; Pinkoviezky, Itai; Fonio, Ehud; Ghosh, Abhijit; Gov, Nir; Feinerman, Ofer

    2015-07-01

    To cooperatively transport a large load, it is important that carriers conform in their efforts and align their forces. A downside of behavioural conformism is that it may decrease the group's responsiveness to external information. Combining experiment and theory, we show how ants optimize collective transport. On the single-ant scale, optimization stems from decision rules that balance individuality and compliance. Macroscopically, these rules poise the system at the transition between random walk and ballistic motion where the collective response to the steering of a single informed ant is maximized. We relate this peak in response to the divergence of susceptibility at a phase transition. Our theoretical models predict that the ant-load system can be transitioned through the critical point of this mesoscopic system by varying its size; we present experiments supporting these predictions. Our findings show that efficient group-level processes can arise from transient amplification of individual-based knowledge.

  18. Florida alternative NTCIP testing software (ANTS) for actuated signal controllers.

    Science.gov (United States)

    2009-01-01

    The scope of this research project did include the development of a software tool to test devices for NTCIP compliance. Development of the Florida Alternative NTCIP Testing Software (ANTS) was developed by the research team due to limitations found w...

  19. Novel fungal disease in complex leaf-cutting ant societies

    DEFF Research Database (Denmark)

    Hughes, David Peter; Evans, Harry C.; Hywel-Jones, Nigel

    2009-01-01

    1. The leaf-cutting ants practise an advanced system of mycophagy where they grow a fungus as a food source. As a consequence of parasite threats to their crops, they have evolved a system of morphological, behavioural, and chemical defences, particularly against fungal pathogens (mycopathogens). 2....... Specific fungal diseases of the leaf-cutting ants themselves have not been described, possibly because broad spectrum anti-fungal defences against mycopathogens have reduced their susceptibility to entomopathogens. 3. Using morphological and molecular tools, the present study documents three rare infection...... events of Acromyrmex and Atta leaf-cutting ants by Ophiocordyceps fungi, agenus of entomopathogens that is normally highly specific in its host choice. 4. As leaf-cutting ants have been intensively studied, the absence of prior records of Ophiocordyceps suggests that these infections may be a novel event...

  20. Heavy metal pollution disturbs immune response in wild ant populations

    International Nuclear Information System (INIS)

    Sorvari, Jouni; Rantala, Liisa M.; Rantala, Markus J.; Hakkarainen, Harri; Eeva, Tapio

    2007-01-01

    Concern about the effects of environmental contaminants on immune function in both humans and wildlife is growing and practically nothing is known about this impact on terrestrial invertebrates, even though they are known to easily accumulate pollutants. We studied the effect of industrial heavy metal contamination on immune defense of a free-living wood ant (Formica aquilonia). To find out whether ants show an adapted immune function in a polluted environment, we compared encapsulation responses between local and translocated colonies. Local colonies showed higher heavy metal levels than the translocated ones but the encapsulation response was similar between the two groups, indicating that the immune system of local ants has not adapted to high contamination level. The encapsulation response was elevated in moderate whereas suppressed in high heavy metal levels suggesting higher risk for infections in heavily polluted areas. - Heavy metal pollution affects immune function in ants

  1. Ant colony search algorithm for optimal reactive power optimization

    Directory of Open Access Journals (Sweden)

    Lenin K.

    2006-01-01

    Full Text Available The paper presents an (ACSA Ant colony search Algorithm for Optimal Reactive Power Optimization and voltage control of power systems. ACSA is a new co-operative agents’ approach, which is inspired by the observation of the behavior of real ant colonies on the topic of ant trial formation and foraging methods. Hence, in the ACSA a set of co-operative agents called "Ants" co-operates to find good solution for Reactive Power Optimization problem. The ACSA is applied for optimal reactive power optimization is evaluated on standard IEEE, 30, 57, 191 (practical test bus system. The proposed approach is tested and compared to genetic algorithm (GA, Adaptive Genetic Algorithm (AGA.

  2. application of ant colony optimisation in distribution transformer sizing

    African Journals Online (AJOL)

    HP

    Keywords: ant colony, optimization, transformer sizing, distribution transformer. 1. INTRODUCTION ... more intensive pheromone and higher probability to be chosen [12]. ..... pp.29-41, 1996. [7] EC global market place, “Technical Parameters”,.

  3. Blastogénesis y pruebas intracutáneas con antígeno parcialmente purificado de Candida albicans

    Directory of Open Access Journals (Sweden)

    Maye Bernal Rivera

    1990-12-01

    Full Text Available Utilizando un antígeno parcialmente purificado de Candida albicans cuya composición se estudió por electrofóresis de poliacrylamida, se demostró que este antígeno estimula una respuesta de hipersensibilidad retardada en el curí, evidenciada tanto por el fenómeno de induración que aparece a las 24 horas y desaparece a las 72 como por estudios de histopatología. De 16 voluntarios estudiados 81.25%, fueron positivos y 18.75% negativos. Los estudios de transformación blástica de linfocitos de los candidina positivos estimulados con cantidades variables del antígeno parcialmente purificado y con base a la incorporación de timidina tritiada, fueron negativos lo cual plantea el hecho de que la prueba de hipersensibilidad retardada y la transformación blástica son fenómenos diferentes en la evaluación inmunológica.

  4. Mecanismos de procesamiento y presentación de antígeno en el sistema inmune

    Directory of Open Access Journals (Sweden)

    Jean Paul Vernot

    1990-12-01

    Full Text Available El sistema inmune muestra una gran versatilidad para reconocer y responder a una gran cantidad de macromoléculas extrañas o antígenos (Ag, eliminándolos y evitando a la vez reaccionar con constituyentes propios (1. Esto se realiza por la colaboración de linfocitos B (LB y de linfocitos T (LT que expresan un conjunto diferente de receptores. Aunque el receptor del LB (Inmunoglobulina y el del LT (TCR son similares en algunos aspectos y son codificados por secuencias de la misma familia de genes (2, difieren en la manera como reconocen el Ag. Mientras los LB reaccionan con el Ag en forma nativa, los LT son incapaces de discriminar entre la forma nativa y la denaturada (3.

  5. Fluid intake rates in ants correlate with their feeding habits.

    Science.gov (United States)

    Paul, J; Roces, F

    2003-04-01

    This study investigates the techniques of nectar feeding in 11 different ant species, and quantitatively compares fluid intake rates over a wide range of nectar concentrations in four species that largely differ in their feeding habits. Ants were observed to employ two different techniques for liquid food intake, in which the glossa works either as a passive duct-like structure (sucking), or as an up- and downwards moving shovel (licking). The technique employed for collecting fluids at ad libitum food sources was observed to be species-specific and to correlate with the presence or absence of a well-developed crop in the species under scrutiny. Workers of ponerine ants licked fluid food during foraging and transported it as a droplet between their mandibles, whereas workers of species belonging to phylogenetically more advanced subfamilies, with a crop capable of storing liquids, sucked the fluid food, such as formicine ants of the genus Camponotus. In order to evaluate the performance of fluid collection during foraging, intake rates for sucrose solutions of different concentrations were measured in four ant species that differ in their foraging ecology. Scaling functions between fluid intake rates and ant size were first established for the polymorphic species, so as to compare ants of different size across species. Results showed that fluid intake rate depended, as expected and previously reported in the literature, on sugar concentration and the associated fluid viscosity. It also depended on both the species-specific feeding technique and the extent of specialization on foraging on liquid food. For similarly-sized ants, workers of two nectar-feeding ant species, Camponotus rufipes (Formicinae) and Pachycondyla villosa (Ponerinae), collected fluids with the highest intake rates, while workers of the leaf-cutting ant Atta sexdens (Myrmicinae) and a predatory ant from the Rhytidoponera impressa-complex (Ponerinae) did so with the lowest rate. Calculating the

  6. Climatic warming destabilizes forest ant communities.

    Science.gov (United States)

    Diamond, Sarah E; Nichols, Lauren M; Pelini, Shannon L; Penick, Clint A; Barber, Grace W; Cahan, Sara Helms; Dunn, Robert R; Ellison, Aaron M; Sanders, Nathan J; Gotelli, Nicholas J

    2016-10-01

    How will ecological communities change in response to climate warming? Direct effects of temperature and indirect cascading effects of species interactions are already altering the structure of local communities, but the dynamics of community change are still poorly understood. We explore the cumulative effects of warming on the dynamics and turnover of forest ant communities that were warmed as part of a 5-year climate manipulation experiment at two sites in eastern North America. At the community level, warming consistently increased occupancy of nests and decreased extinction and nest abandonment. This consistency was largely driven by strong responses of a subset of thermophilic species at each site. As colonies of thermophilic species persisted in nests for longer periods of time under warmer temperatures, turnover was diminished, and species interactions were likely altered. We found that dynamical (Lyapunov) community stability decreased with warming both within and between sites. These results refute null expectations of simple temperature-driven increases in the activity and movement of thermophilic ectotherms. The reduction in stability under warming contrasts with the findings of previous studies that suggest resilience of species interactions to experimental and natural warming. In the face of warmer, no-analog climates, communities of the future may become increasingly fragile and unstable.

  7. Recognition in ants: social origin matters.

    Directory of Open Access Journals (Sweden)

    Joël Meunier

    Full Text Available The ability of group members to discriminate against foreigners is a keystone in the evolution of sociality. In social insects, colony social structure (number of queens is generally thought to influence abilities of resident workers to discriminate between nestmates and non-nestmates. However, whether social origin of introduced individuals has an effect on their acceptance in conspecific colonies remains poorly explored. Using egg-acceptance bioassays, we tested the influence of social origin of queen-laid eggs on their acceptance by foreign workers in the ant Formica selysi. We showed that workers from both single- and multiple-queen colonies discriminated against foreign eggs from single-queen colonies, whereas they surprisingly accepted foreign eggs from multiple-queen colonies. Chemical analyses then demonstrated that social origins of eggs and workers could be discriminated on the basis of their chemical profiles, a signal generally involved in nestmate discrimination. These findings provide the first evidence in social insects that social origins of eggs interfere with nestmate discrimination and are encoded by chemical signatures.

  8. Nasa's Ant-Inspired Swarmie Robots

    Science.gov (United States)

    Leucht, Kurt W.

    2016-01-01

    As humans push further beyond the grasp of earth, robotic missions in advance of human missions will play an increasingly important role. These robotic systems will find and retrieve valuable resources as part of an in-situ resource utilization (ISRU) strategy. They will need to be highly autonomous while maintaining high task performance levels. NASA Kennedy Space Center has teamed up with the Biological Computation Lab at the University of New Mexico to create a swarm of small, low-cost, autonomous robots to be used as a ground-based research platform for ISRU missions. The behavior of the robot swarm mimics the central-place foraging strategy of ants to find and collect resources in a previously unmapped environment and return those resources to a central site. This talk will guide the audience through the Swarmie robot project from its conception by students in a New Mexico research lab to its robot trials in an outdoor parking lot at NASA. The software technologies and techniques used on the project will be discussed, as well as various challenges and solutions that were encountered by the development team along the way.

  9. El papel docente ante las emociones de niñas y niños de tercer grado

    Directory of Open Access Journals (Sweden)

    Mónica Calderón Rodríguez

    2014-01-01

    Full Text Available En este artículo se presentan los resultados de una investigación realizada durante los años 2011-2012, cuyo objetivo fue analizar el papel del personal docente ante las emociones que manifiestan en el aula las niñas y los niños de tercer grado de dos escuelas urbanas de la provincia de San José. La investigación se fundamenta en la identificación de los conocimientos, habilidades, estrategias y recursos utilizados por el personal docente ante las diferentes emociones que manifiesta el estudiantado en el aula. La metodología de la investigación se dio bajo un enfoque mixto, por lo que el trabajo se dividió en una fase cualitativa y otra cuantitativa; en cada una se aplicaron diferentes instrumentos con base en los objetivos de la investigación; posteriormente se realizó una integración de ambos enfoques, para ampliar la perspectiva de las respuestas del personal docente ante las emociones que experimentan las niñas y los niños en el aula. A partir de los resultados obtenidos se identifican elementos facilitadores y obstaculizadores del quehacer docente, sobre las emociones de sus estudiantes y se logra constatar una deficiencia en el profesional en educación en cuanto al conocimiento de la temática, la falta de estrategias aplicables a las emociones de sus estudiantes, la poca información y actualización que se tiene en cuanto a la educación emocional en las aulas. This article presents the results of a research conducted over the years 2011-2012, in which the role of teachers in the face of the emotions felt in the classroom by third graders in two urban schools of the province of San José was analyzed. The research was based on the identification of the knowledge, skills, strategies and resources used by teachers as a response to different emotions that children manifest in the classroom.. The research methodology was developed under a mixed approach, therefore it was divided in a qualitative and a quantitative phase. In

  10. Carbohydrate supply limits invasion of natural communities by Argentine ants.

    Science.gov (United States)

    Rowles, Alexei D; Silverman, Jules

    2009-08-01

    The ability of species to invade new habitats is often limited by various biotic and physical factors or interactions between the two. Invasive ants, frequently associated with human activities, flourish in disturbed urban and agricultural environments. However, their ability to invade and establish in natural habitats is more variable. This is particularly so for the invasive Argentine ant (Linepithema humile). While biotic resistance and low soil moisture limits their invasion of natural habitats in some instances, the effect of food availability has been poorly explored. We conducted field experiments to determine if resource availability limits the spread and persistence of Argentine ants in remnant natural forest in North Carolina. Replicated transects paired with and without sucrose solution feeding stations were run from invaded urban edges into forest remnants and compared over time using baits and direct counts at feeding stations. Repeated under different timing regimes in 2006 and 2007, access to sucrose increased local Argentine ant abundances (1.6-2.5 fold) and facilitated their progression into the forest up to 73 +/- 21% of 50-m transects. Resource removal caused an expected decrease in Argentine ant densities in 2006, in conjunction with their retreat to the urban/forest boundary. However, in 2007, Argentine ant numbers unexpectedly continued to increase in the absence of sugar stations, possibly through access to alternative resources or conditions not available the previous year such as honeydew-excreting Hemiptera. Our results showed that supplementing carbohydrate supply facilitates invasion of natural habitat by Argentine ants. This is particularly evident where Argentine ants continued to thrive following sugar station removal.

  11. Hybridization in East African swarm-raiding army ants

    DEFF Research Database (Denmark)

    Kronauer, Daniel Jc; Peters, Marcell K; Schöning, Caspar

    2011-01-01

    Hybridization can have complex effects on evolutionary dynamics in ants because of the combination of haplodiploid sex-determination and eusociality. While hybrid non-reproductive workers have been found in a range of species, examples of gene-flow via hybrid queens and males are rare. We studied...... hybridization in East African army ants (Dorylus subgenus Anomma) using morphology, mitochondrial DNA sequences, and nuclear microsatellites....

  12. An Improved Ant Colony Matching by Using Discrete Curve Evolution

    OpenAIRE

    Saadi, Younes; Sari, Eka,; Herawan, Tutut

    2014-01-01

    Part 1: Information & Communication Technology-EurAsia Conference 2014, ICT-EurAsia 2014; International audience; In this paper we present an improved Ant Colony Optimization (ACO) for contour matching, which can be used to match 2D shapes. Discrete Curve Evolution (DCE) technique is used to simplify the extracted contour. In order to find the best correspondence between shapes, the match process is formulated as a Quadratic Assignment Problem (QAP) and resolved by using Ant Colony Optimizati...

  13. Behavior of ergatoid males in the ant, Cardiocondyla nuda

    OpenAIRE

    Heinze, Jürgen; Künholz, S.; Schilder, K.; Hölldobler, B.

    1993-01-01

    Ergatoid males of the ant, Cardiocondyla nuda, attack and frequently kill young males during or shortly after eclosion. Smaller colonies therefore contain typically only one adult male, which may inseminate all alate queens which are reared in the colony over a few weeks. In larger colonies, several males may be present, however, fighting among adult males was not observed. We discuss the significance of male fighting behavior in ants.

  14. Trail Pheromone Disruption of Argentine Ant Trail Formation and Foraging

    Science.gov (United States)

    Suckling, D.M.; Peck, R.W.; Stringer, L.D.; Snook, K.; Banko, P.C.

    2010-01-01

    Trail pheromone disruption of invasive ants is a novel tactic that builds on the development of pheromone-based pest management in other insects. Argentine ant trail pheromone, (Z)-9-hexadecenal, was formulated as a micro-encapsulated sprayable particle and applied against Argentine ant populations in 400 m2 field plots in Hawai'i Volcanoes National Park. A widely dispersed point source strategy for trail pheromone disruption was used. Traffic rates of ants in bioassays of treated filter paper, protected from rainfall and sunlight, indicated the presence of behaviorally significant quantities of pheromone being released from the formulation for up to 59 days. The proportion of plots, under trade wind conditions (2-3 m s-1), with visible trails was reduced for up to 14 days following treatment, and the number of foraging ants at randomly placed tuna-bait cards was similarly reduced. The success of these trail pheromone disruption trials in a natural ecosystem highlights the potential of this method for control of invasive ant species in this and other environments. ?? Springer Science+Business Media, LLC 2010.

  15. No sex in fungus-farming ants or their crops.

    Science.gov (United States)

    Himler, Anna G; Caldera, Eric J; Baer, Boris C; Fernández-Marín, Hermógenes; Mueller, Ulrich G

    2009-07-22

    Asexual reproduction imposes evolutionary handicaps on asexual species, rendering them prone to extinction, because asexual reproduction generates novel genotypes and purges deleterious mutations at lower rates than sexual reproduction. Here, we report the first case of complete asexuality in ants, the fungus-growing ant Mycocepurus smithii, where queens reproduce asexually but workers are sterile, which is doubly enigmatic because the clonal colonies of M. smithii also depend on clonal fungi for food. Degenerate female mating anatomy, extensive field and laboratory surveys, and DNA fingerprinting implicate complete asexuality in this widespread ant species. Maternally inherited bacteria (e.g. Wolbachia, Cardinium) and the fungal cultivars can be ruled out as agents inducing asexuality. M. smithii societies of clonal females provide a unique system to test theories of parent-offspring conflict and reproductive policing in social insects. Asexuality of both ant farmer and fungal crop challenges traditional views proposing that sexual farmer ants outpace coevolving sexual crop pathogens, and thus compensate for vulnerabilities of their asexual crops. Either the double asexuality of both farmer and crop may permit the host to fully exploit advantages of asexuality for unknown reasons or frequent switching between crops (symbiont reassociation) generates novel ant-fungus combinations, which may compensate for any evolutionary handicaps of asexuality in M. smithii.

  16. [Ants as carriers of microorganisms in hospital environments].

    Science.gov (United States)

    Pereira, Rogério Dos Santos; Ueno, Mariko

    2008-01-01

    Concern exists regarding the real possibility of public health threats caused by pathogenic agents that are carried by urban ants. The present study had the objective of isolating and identifying the microorganisms that are associated with ants in hospital environments. One hundred and twenty-five ants of the same species were collected from different units of a university hospital. Each ant was collected using a swab soaked with physiological solution and was transferred to a tube containing brain heart infusion broth and incubated at 35 degrees C for 24 hours. From each tube, with growth, inoculations were made into specific culturing media, to isolate any microorganisms. The ants presented a high capacity for carrying microorganism groups: spore-producing Gram-positive bacilli 63.5%, Gram-negative bacilli 6.3%, Gram-positive cocci 23.1%, filamentous fungi 6.7% and yeast 0.5%. Thus, it can be inferred that ants may be one of the agents responsible for disseminating microorganisms in hospital environments.

  17. Species-Specific Effects of Ant Inhabitants on Bromeliad Nutrition.

    Directory of Open Access Journals (Sweden)

    Ana Z Gonçalves

    Full Text Available Predator activities may lead to the accumulation of nutrients in specific areas of terrestrial habitats where they dispose of prey carcasses. In their feeding sites, predators may increase nutrient availability in the soil and favor plant nutrition and growth. However, the translocation of nutrients from one habitat to another may depend on predator identity and diet, as well as on the amount of prey intake. Here we used isotopic (15N and physiological methods in greenhouse experiments to evaluate the effects of the identity of predatory ants (i.e., the consumption of prey and nest sites on the nutrition and growth of the bromeliad Quesnelia arvensis. We showed that predatory ants with protein-based nutrition (i.e., Odontomachus hastatus, Gnamptogenys moelleri improved the performance of their host bromeliads (i.e., increased foliar N, production of soluble proteins and growth. On the other hand, the contribution of Camponotus crassus for the nutritional status of bromeliads did not differ from bromeliads without ants, possibly because this ant does not have arthropod prey as a preferred food source. Our results show, for the first time, that predatory ants can translocate nutrients from one habitat to another within forests, accumulating nutrients in their feeding sites that become available to bromeliads. Additionally, we highlight that ant contribution to plant nutrition may depend on predator identity and its dietary requirements. Nest debris may be especially important for epiphytic and terrestrial bromeliads in nutrient-poor environments.

  18. Reaction of mutualistic and granivorous ants to ulex elaiosome chemicals.

    Science.gov (United States)

    Gammans, Nicola; Bullock, James M; Gibbons, Hannah; Schönrogge, Karsten

    2006-09-01

    It has been proposed that chemicals on plant elaiosomes aid seed detection by seed-dispersing ants. We hypothesized that the chemical interaction between ants and elaiosomes is more intimate than a generic attraction, and that elaiosome chemicals will attract mutualistic but not granivorous ant species. We investigated this by using two gorse species, Ulex minor and U. europaeus, and two associated ant species from European heathlands, the mutualist Myrmica ruginodis and the granivore Tetramorium caespitum. Behavioral studies were conducted with laboratory nests and foraging arenas. Both ants will take Ulex seeds, but while M. ruginodis showed increased antennation toward ether extracts of elaiosome surface chemicals compared with controls, T. caespitum showed no response. Elaiosome extracts were separated into seven lipid fractions. M. ruginodis showed increased antennation only toward the diglyceride fractions of both Ulex species, whereas T. caespitum showed no consistent reaction. This indicates that M. ruginodis can detect the elaiosome by responding to its surface chemicals, but T. caespitum is unresponsive to these chemicals. Responses to surface chemicals could increase the rate of seed detection in the field, and so these results suggest that Ulex elaiosomes produce chemicals that facilitate attraction of mutualistic rather than granivorous ant species. This could reduce seed predation and increase Ulex fitness.

  19. Aversive learning of odor-heat associations in ants.

    Science.gov (United States)

    Desmedt, Lucie; Baracchi, David; Devaud, Jean-Marc; Giurfa, Martin; d'Ettorre, Patrizia

    2017-12-15

    Ants have recently emerged as useful models for the study of olfactory learning. In this framework, the development of a protocol for the appetitive conditioning of the maxilla-labium extension response (MaLER) provided the possibility of studying Pavlovian odor-food learning in a controlled environment. Here we extend these studies by introducing the first Pavlovian aversive learning protocol for harnessed ants in the laboratory. We worked with carpenter ants Camponotus aethiops and first determined the capacity of different temperatures applied to the body surface to elicit the typical aversive mandible opening response (MOR). We determined that 75°C is the optimal temperature to induce MOR and chose the hind legs as the stimulated body region because of their high sensitivity. We then studied the ability of ants to learn and remember odor-heat associations using 75°C as the unconditioned stimulus. We studied learning and short-term retention after absolute (one odor paired with heat) and differential conditioning (a punished odor versus an unpunished odor). Our results show that ants successfully learn the odor-heat association under a differential-conditioning regime and thus exhibit a conditioned MOR to the punished odor. Yet, their performance under an absolute-conditioning regime is poor. These results demonstrate that ants are capable of aversive learning and confirm previous findings about the different attentional resources solicited by differential and absolute conditioning in general. © 2017. Published by The Company of Biologists Ltd.

  20. Competence of Litter Ants for Rapid Biodiversity Assessments

    Directory of Open Access Journals (Sweden)

    T. H. Saumya E. Silva

    2017-01-01

    Full Text Available Rapid Biodiversity Assessment approaches associated with focusing taxa have overcome many of the problems related to large scale surveys. This study examined the suitability of litter ants as a focusing taxon by checking whether diversity and species assemblages of litter ants reflect the overall picture of arthropod diversity and assemblages in leaf litter in two vegetation types: secondary forest and pine plantation in Upper Hanthana forest reserve, Sri Lanka. In each vegetation type, arthropods were sampled using three sampling methods (Winkler extraction, hand collection, and pitfall traps along three 100 m line transects. From the two sites, 1887 litter ants (34 species and 3488 litter arthropods (52 species were collected. Species assemblages composition of both ants and other arthropods differed significantly between the two sites (ANOSIM, p=0.001 with both groups generating distinct clusters for the two sites (SIMPROF, p=0.001. But there was no significant correlation (p>0.05 between abundance and richness of litter ants and those of other arthropods in both vegetation types. The overall finding suggests that the litter ants do not reflect the holistic picture of arthropod diversity and assemblages in leaf litter, but the quality of the habitat for the survival of all litter arthropods.

  1. Water stress strengthens mutualism among ants, trees, and scale insects.

    Directory of Open Access Journals (Sweden)

    Elizabeth G Pringle

    2013-11-01

    Full Text Available Abiotic environmental variables strongly affect the outcomes of species interactions. For example, mutualistic interactions between species are often stronger when resources are limited. The effect might be indirect: water stress on plants can lead to carbon stress, which could alter carbon-mediated plant mutualisms. In mutualistic ant-plant symbioses, plants host ant colonies that defend them against herbivores. Here we show that the partners' investments in a widespread ant-plant symbiosis increase with water stress across 26 sites along a Mesoamerican precipitation gradient. At lower precipitation levels, Cordia alliodora trees invest more carbon in Azteca ants via phloem-feeding scale insects that provide the ants with sugars, and the ants provide better defense of the carbon-producing leaves. Under water stress, the trees have smaller carbon pools. A model of the carbon trade-offs for the mutualistic partners shows that the observed strategies can arise from the carbon costs of rare but extreme events of herbivory in the rainy season. Thus, water limitation, together with the risk of herbivory, increases the strength of a carbon-based mutualism.

  2. An invasive slug exploits an ant-seed dispersal mutualism.

    Science.gov (United States)

    Meadley Dunphy, Shannon A; Prior, Kirsten M; Frederickson, Megan E

    2016-05-01

    Plant-animal mutualisms, such as seed dispersal, are often vulnerable to disruption by invasive species. Here, we show for the first time how a non-ant invasive species negatively affects seed dispersal by ants. We examined the effects of several animal species that co-occur in a temperate deciduous forest-including native and invasive seed-dispersing ants (Aphaenogaster rudis and Myrmica rubra, respectively), an invasive slug (Arion subfuscus), and native rodents-on a native myrmecochorous plant, Asarum canadense. We experimentally manipulated ant, slug, and rodent access to seed depots and measured seed removal. We also video-recorded depots to determine which other taxa interact with seeds. We found that A. rudis was the main disperser of seeds and that A. subfuscus consumed elaiosomes without dispersing seeds. Rodent visitation was rare, and rodent exclusion had no significant effect on seed or elaiosome removal. We then used data obtained from laboratory and field mesocosm experiments to determine how elaiosome robbing by A. subfuscus affects seed dispersal by A. rudis and M. rubra. We found that elaiosome robbing by slugs reduced seed dispersal by ants, especially in mesocosms with A. rudis, which picks up seeds more slowly than M. rubra. Taken together, our results show that elaiosome robbing by an invasive slug reduces seed dispersal by ants, suggesting that invasive slugs can have profound negative effects on seed dispersal mutualisms.

  3. Water stress strengthens mutualism among ants, trees, and scale insects.

    Science.gov (United States)

    Pringle, Elizabeth G; Akçay, Erol; Raab, Ted K; Dirzo, Rodolfo; Gordon, Deborah M

    2013-11-01

    Abiotic environmental variables strongly affect the outcomes of species interactions. For example, mutualistic interactions between species are often stronger when resources are limited. The effect might be indirect: water stress on plants can lead to carbon stress, which could alter carbon-mediated plant mutualisms. In mutualistic ant-plant symbioses, plants host ant colonies that defend them against herbivores. Here we show that the partners' investments in a widespread ant-plant symbiosis increase with water stress across 26 sites along a Mesoamerican precipitation gradient. At lower precipitation levels, Cordia alliodora trees invest more carbon in Azteca ants via phloem-feeding scale insects that provide the ants with sugars, and the ants provide better defense of the carbon-producing leaves. Under water stress, the trees have smaller carbon pools. A model of the carbon trade-offs for the mutualistic partners shows that the observed strategies can arise from the carbon costs of rare but extreme events of herbivory in the rainy season. Thus, water limitation, together with the risk of herbivory, increases the strength of a carbon-based mutualism.

  4. Actitud ante la muerte en los Médicos de Familia

    Directory of Open Access Journals (Sweden)

    Gisela Hernández Cabrera

    2002-02-01

    Full Text Available Se realizó un estudio descriptivo para caracterizar las actitudes ante la muerte en una muestra de 50 Médicos de Familia del Policlínico "Plaza". Se utilizó una versión cubana de un instrumento diseñado anteriormente para estudiar las actitudes ante la muerte. Se intentaba a su vez, establecer los primeros indicadores de validez y confiabilidad de esta versión denominada convencionalmente: cuestionario de actitudes ante la muerte (CAM, que incluía 33 reactivos, agrupados para su interpretación en 6 subescalas: evitación, aceptación, temor, pasaje, salida y perspectiva profesional. El procesamiento de las respuestas incluyó estadísticas descriptivas y pruebas de decisión con ayuda del sistema SSPS-PC+. Las actitudes prevalentes en los médicos eran de evitación y temor, en un contexto ambivalente dado por las actitudes positivas de aceptación de la muerte como un hecho natural, que se traduce en afrontamiento profesional no consecuente. En general, se encuentran actitudes que revelan la insuficiente preparación de los Médicos de Familia investigados para la aproximación realista a la muerte.A descriptive study of attitudes to death was carried out in a sample of 50 family physicians from "Plaza" polyclinics. A Cuban version of a previously designed instrument to study attitudes to death was used. At the same time, it was intended to establish the first indicators of validation and reliability of this version which is conventionally called: Questionnaire of Attitudes to Death (QAD that includes 33 reactions grouped into 6 subclasses for the purpose of interpretation: avoidance, acceptance, fear, passage, exit and professional perspective. The processing of responses covered descriptive statistics and decision-making tests assisted by the SSPS-PC+ system. The prevailing attitudes to death found in the physicians were: avoidance and fear in an ambivalent environment given by positive attitudes of death acceptance as a natural fact

  5. Transferencia del dorsal ancho para lesiones irreparables del manguito rotador. Técnica quirúrgica y evaluación de una serie de 20 pacientes

    Directory of Open Access Journals (Sweden)

    Rafael Rodríguez

    2016-04-01

    promedio de 1 y por la mejoría de la elevación y rotación externa antes mencionada. La evaluación radiológica post operatoria, siguiendo los criterios de Hamada no evidenció una progresión significativa hacia la artropatía por rotura del manguito.

  6. Una revisión sobre los factores de riesgo en la infancia para la esquizofrenia y los trastornos mentales graves del adulto

    Directory of Open Access Journals (Sweden)

    Jordi Artigue

    2014-08-01

    Conclusiones: Existen acontecimientos vitales que pueden ser considerados de riesgo para la salud mental de un niño. Se ha demostrado que la acumulación de estas circunstancias genera una trayectoria de vida alterada que hace más vulnerables a las personas ante la posibilidad de presentar un trastorno mental.

  7. CO2 efflux from subterranean nests of ant communities in a seasonal tropical forest, Thailand

    OpenAIRE

    Hasin, Sasitorn; Ohashi, Mizue; Yamada, Akinori; Hashimoto, Yoshiaki; Tasen, Wattanachai; Kume, Tomonori; Yamane, Seiki

    2014-01-01

    Many ant species construct subterranean nests. The presence of their nests may explain soil respiration “hot spots”, an important factor in the high CO2 efflux from tropical forests. However, no studies have directly measured CO2 efflux from ant nests. We established 61 experimental plots containing 13 subterranean ant species to evaluate the CO2 efflux from subterranean ant nests in a tropical seasonal forest, Thailand. We examined differences in nest CO2 efflux among ant species. We determi...

  8. Afrontamiento de la ansiedad ante los exámenes universitarios mediante un programa de Inoculación de Estrés: Caso Clínico

    OpenAIRE

    Escolar-Llamazares, M.C.; Serrano-Pintado, I.

    2016-01-01

    Introducción: Partiendo de la definición del constructo ansiedad ante los exámenes que realiza Spielberger y de la diferenciación de Wolpe entre problemas de ansiedad racional y problemas de ansiedad irracional se ha aplicado un programa basado en Inoculación de Estrés. Objetivo: Disminuir la ansiedad ante los exámenes que manifestaba una estudiante de Enfermería de la Universidad de Salamanca. Método: Se trata de un estudio cuasi-experimental de caso único con diseño AB sin retirada del trat...

  9. Ecuador: una democracia inestable

    Directory of Open Access Journals (Sweden)

    Juan J. Paz y Miño Cepeda

    2009-12-01

    Full Text Available En 1979, tras una década de dictaduras militares, se inició la fase constitucional más larga en la historia del Ecuador. Ésta se levantó sobre las herencias del pasado y se caracterizó, de manera fundamental, por el tránsito desde un modelo estatal-desarrollista hacia uno de tipo empresarial, por el aparecimiento de nuevos agentes sociales, el multipartidismo político, la regionalización nacional, la presencia multicultural y la inserción del país en nuevas relaciones internacionales. Pero esos procesos trajeron como consecuencias centrales: la edificación de una economía inequitativa, una sociedad tensionada, la desestructuración institucional, la precarización del trabajo y la debilidad con la que la nación ha enfrentado el nuevo mundo unipolar. Todo ello ha configurado un cuadro de riesgos para la incipiente democracia. El Ecuador contemporáneo tiene, por tanto, una serie de desafíos económicos, sociales y políticos para escapar a la inestabilidad que ha acompañado a la construcción de su modernización democrática.___________________ABSTRACT:In 1979, after one decade of military dictatorships, the longest constitutional phase in the history of Ecuador was initiated. It was built upon the inheritance of the past and can be fundamentally characterized by the transition from a model that focused on the state as developing the economy (State-model to a model that focused on private business (enterprise-model. The appearance of new social agents, a multiparty system, national regionalization, multicultural presence and the country´s new international relationships are processes which show some important consequences: the establishment of an unequal economy, a society under tension, the breakdown of institutional structures, the vulnerability of working conditions and the weakness with which the nation faced the new polarized world. All this might put into danger this incipient democracy. And this is why Ecuador in these

  10. una propuesta de indicadores

    Directory of Open Access Journals (Sweden)

    Noemí Luján Ponce

    2007-01-01

    Full Text Available La tecnología reviste características de neutralidad, eficiencia, transparencia y regularidad. Factores que hoy día resultan relevantes para realizar procesos electorales confiables. Las redistritaciones electorales en México 1996 y 2005 resultan casos paradigmáticos en relación a la cristalización de la tecnología como una mediación para la construcción de acuerdos entre los partidos y las autoridades electorales. Se ofrecen cinco indicadores para comparar ambos procesos de distritación.

  11. Construir una literatura

    OpenAIRE

    Sánchez Wilde, Ariel Oscar

    1998-01-01

    La consideración de las relaciones entre los textos producidos en el centro yen la periferia del sistema es insoslayable a la hora de abordar la lectura crítica de una literatura, analizándola tanto en su proceso histórico (diacronía), como en un estado determinado de dicho proceso (sincronía). El presente trabajo, a partir de un corpus de diez textos publicados entre 1921 y 1931 en distintos lugares de Latinoamérica (Argentina, Brasil, Cuba, México, Nicaragua, Perú, Puerto Rico y República D...

  12. Using ant-behavior-based simulation model AntWeb to improve website organization

    Science.gov (United States)

    Li, Weigang; Pinheiro Dib, Marcos V.; Teles, Wesley M.; Morais de Andrade, Vlaudemir; Alves de Melo, Alba C. M.; Cariolano, Judas T.

    2002-03-01

    Some web usage mining algorithms showed the potential application to find the difference among the organizations expected by visitors to the website. However, there are still no efficient method and criterion for a web administrator to measure the performance of the modification. In this paper, we developed an AntWeb, a model inspired by ants' behavior to simulate the sequence of visiting the website, in order to measure the efficient of the web structure. We implemented a web usage mining algorithm using backtrack to the intranet website of the Politec Informatic Ltd., Brazil. We defined throughput (the number of visitors to reach their target pages per time unit relates to the total number of visitors) as an index to measure the website's performance. We also used the link in a web page to represent the effect of visitors' pheromone trails. For every modification in the website organization, for example, putting a link from the expected location to the target object, the simulation reported the value of throughput as a quick answer about this modification. The experiment showed the stability of our simulation model, and a positive modification to the intranet website of the Politec.

  13. La ética de la liberación ante la ética del discurso

    Directory of Open Access Journals (Sweden)

    Dussel, Enrique

    1996-04-01

    Full Text Available Not available.

    En este artículo el autor responde a cuatro objeciones que Karí-Otto Apel desarrolla en el trabajo: «La ética del Discurso ante el desafío de la Filosofía de la Liberación» (lsegoría 11, pp. 108•125. 1 La miseria, que es una evidencia de exigencia ética, necesita para alcanzar validez intersubjetiva de la mediación hermenéutica de las ciencias sociales criticas. 2 En el nivel ideológico la Filosofía de la Liberación no acepta ser criticada de historicisrno y de un cierto econornicismo marxista Standard, ya que reconstruye el pensamiento de Marx de manera original. 3 La trascendentalidad trans-ontológica que propone la Filosofía de la Liberación es propia de la alteridad de tipo levínasíano, 4 Aunque se acepta la necesidad de efectuar una fundamentación formal antiescéptica, lo que importa ética y materialmente es la demostración ante el cínico que pretende justificar la muerte de la verdad ética de la praxis de liberación.

  14. Tensión Emocional del niño ante el Médico

    Directory of Open Access Journals (Sweden)

    Hernando Forero Caballero

    1990-08-01

    Full Text Available

    El estado emocional del niño ante una nueva imagen o acontecimiento es variable de acuerdo con la edad, el estado psicológico y la intensidad o manera como recibe el factor estimulante.

    La respuesta puede ser de placer, satisfacción o al contrario de miedo, temor o ansiedad.

    Los niños normales tienen frecuentes temores.

    En el caso de una nueva y súbita experiencia como en la consulta médica el niño siente miedo, temor o ansiedad, por lo cual es conveniente que determinemos su proceso.

    Miedo o temor consiste en una reacción fisiológica normal, desencadenada por un factor de amenaza real, la cual desaparece al retirar el estímulo desencadenante. El niño puede experimentar un sentimiento subjetivo de malestar y cambios fisiológicos de sudoración, palpitaciones, sensación de frío y hasta temblor en las manos. La reacción de respuesta al estímulo es aparentemente irracional y automática, especialmente’ llanto, gritos, súplica de ayuda y reacciones motoras de huida y de inmovilidad absoluta, tendientes a evitar el estímulo.

    Las reacciones de ansiedad se manifiestan por una sensación de aprehensión,.desasosiego y aversión que se presenta de una manera difusa, como respuesta a un estado psicológico primario o en relación con síntomas de una enfermedad somática o estado tóxico, sin que pueda en un momento dado, identificarse el estímulo específico precipitante.

    Spielberger y Cattell prefieren determinar estos estados emocionales así:

    “SITUACION DE ANSIEDAD que es un estado transitorio variable en intensidad de acuerdo con la función del factor estimulante.

    “RASGO DE ANSIEDAD es una condición relativamente fluctuante, la cual ejerce una influencia constante en la conducta de la persona”.

    La diferencia entre el temor y la ansiedad es un tanto difícil de aclarar en la clínica, por lo cual es conveniente que la consideremos

  15. Una finestra sul polo

    Directory of Open Access Journals (Sweden)

    Graziella Busso

    2015-07-01

    Full Text Available Rabbia, dolore, incredulità si mescolano in un turbinio di emozioni quando, dalle affissioni che quasi quotidianamente si danno il cambio, si legge il necrologio di un “qualcuno” che sappiamo ucciso dal cancro. E pensiamo che, ancora e forse per tanto tempo, potremmo essere più fortunati. E non c’è pace, non c’è consolazione per quei giorni di vita vissuta, strappata, stropicciata, rubata da un mostro che non sempre è possibile sconfiggere finché non subentra la stanchezza, la rassegnazione, la secchezza delle ghiandole lacrimali. Unico strumento per cercare di “cambiare le cose”, per quanto difficile possa sembrare farlo, è combattere, perché la lotta per un ambiente più vivibile sarà una conquista per noi e per i nostri figli, un’eredità che non ha prezzo. La voglia di “gridare” la sofferenza di chi vive la realtà di uno sviluppo insostenibile si è da tempo trasformata ad Augusta in una battaglia di sensibilizzazione alla ormai annosa problematica e nel profondo desiderio di raccontare, far conoscere, testimoniare emozioni, desideri, sogni di chi vive in prima persona o ha vissuto la malattia di un proprio caro perché tutto questo possa servire a spingere verso quel mutamento culturale, storico, ambientale a cui tutti noi agogniamo.

  16. Population Development of Several Species of Ants on the Cocoa Trees in South Sulawesi

    Directory of Open Access Journals (Sweden)

    Fatahuddin Fatahuddin

    2010-08-01

    Full Text Available Several species of ants with different behavior have been found in cocoa plantations and their behavior is important to be considered because it might be correlated with the degree of protection of cocoa plant from cocoa pests. The aim of this research is to manipulate and to develop ants population in environment, so they are able to establish permanently in cocoa trees. This research was conducted in Papakaju Regions Luwu Regency in Juli to November 2009. In this study, 10 cocoa trees with ants were sampled (each species of ant in 10 cocoa trees. A control of 10 tree samples without ant was also taken. In order to assess the abundance of ant population, it was grouped based on scoring, which score 1 for less than 20 ants, score 2 for 21–50 ants, score 3 for 51–200 ants, score 4 for 201–1000 ants, and score 5 for more than 1000 per tree. The results indicated that average of population score of the three ants species reached the highest population for the Oecophylla. smaragdina with average score 4.85 (>1000 ants, Dolichoderus thoracicus, with average score 3.90 (> 200 ants and Crematogaster. difformis with average score 3.10 (>200 ants. This research indicated that three species of ants, Oecophylla smaragdina (weaver ant, Dolichoderus thoracicus (cocoa black ant and Crematogaster difformis (cracking ant. in farmer cocoa plantations in South Sulawesi giving better performance against major pests of cocoa in particular cocoa pod borer (CPB. Key words: Ant Population, Oecophylla smaragdina, Dolichoderus thoracicus, Crematogaster difformis, artificial nest, cocoa.

  17. Bioterrorismo: apuntes para una agenda de lo inesperado

    Directory of Open Access Journals (Sweden)

    Ponce de León-Rosales Samuel

    2001-01-01

    Full Text Available La vulnerabilidad de las poblaciones humanas a terrorismo químico, biológico, radiológico y nuclear ha sido ampliamente discutida pero insuficientemente analizada. Las políticas de salud pública carecen de información sólida y relevante para diseñar programas costo-efectivos para prevenir o mitigar este tipo de incidentes en el futuro. Los gobiernos tienen insuficiencia presupuestal para hacer frente a este tipo de ataques. Por lo anterior, en países en desarrollo, como México, es conveniente reflexionar sobre las acciones preventivas particulares, los agentes potenciales y la prevención de la transmisión. Propuestas. La respuesta internacional ante un ataque biológico debe basarse en acuerdos internacionales que prohiben el uso de agentes biológicos con fines de guerra o defensa; así como intercambio académico y tecnológico para la prevención de ataques bioterroristas. Las recomendaciones, a escala nacional, ante un ataque biológico son: a una estrategia legal de defensa contra bioterrorismo; b educación, como clave para defensa contra bioterrorismo; c creación de un programa nacional de coordinación interinstitucional antibioterrorista, que incluya asistencia de urgencias médicas y la obtención de evidencia médica forense; d instalación de un sistema de vigilancia epidemiológica ante el uso de armas biológicas; e instauración de un laboratorio de análisis de material biológico asociado con incidentes terroristas; f preparación de campañas públicas de información; g garantía de abasto de material diagnóstico, protección especial y tratamiento de urgencias ante ataques biológicos; h descentralización de sistemas de alerta para detección oportuna de terrorismo biológico; i respuesta a acciones bioterroristas dirigidas contra animales y plantas, y j creación de Comités de Etica ante situaciones de urgencia por un ataque biológico. Conclusiones. El cambiante panorama epidemiológico requiere de una

  18. Respuestas faciales ante imágenes de advertencia de tabaco

    Directory of Open Access Journals (Sweden)

    M. A. Muñoz

    Full Text Available Resumen En 2003, la Comisión Europea propuso una serie de advertencias visuales para ser incluidas en los embalajes de tabaco, con el objetivo de motivar a los fumadores a dejar de fumar y promover actitudes negativas hacia el tabaco. El objetivo de este estudio fue evaluar el impacto de las advertencias sanitarias mediante autoinformes y medidas psicofisiológicas. Cincuenta sujetos sanos (19-23 años visionaron un conjunto de treinta y seis imágenes de diferente contenido emocional y veinticuatro del banco de imágenes preventivas propuestas por la Comisión Europea. Se registró la actividad eléctrica de los músculos cigomático mayor y corrugador mientras los sujetos visionaban estas imágenes. A continuación, los participantes evaluaban las imágenes en las dimensiones de agradabilidad y activación. Los resultados muestran una mayor actividad eléctrica del musculo corrugador ante la presentación de imágenes desagradables comparadas con advertencias desagradables incluidas en los paquetes de tabaco. Estos resultados sugieren que la campaña preventiva podría beneficiarse de imágenes preventivas más impactantes, promoviendo así la activación del sistema motivacional evitativo/defensivo.

  19. Propiedades psicométricas de la escala de ansiedad ante la muerte de Templer en sujetos mexicanos.

    Directory of Open Access Journals (Sweden)

    Armando Rivera-Ledesma

    2010-01-01

    Full Text Available La presente investigación adaptó la Escala de Ansiedad ante la Muerte de Templer (1970 al español mexicano y obtuvo sus propiedades psicométricas para dos muestras de adultos mexicanos radicados en la ciudad de México. Se entrevistaron 314 sujetos: 165 fueron adultos mayores (97 mujeres y 68 hombres con una edad media de 61.7 y 62.7 respectivamente y 149 estudiantes universitarios (132 mujeres y 17 hombres con una edad media de 19.4 y 19.9 años. La escala de respuesta se cambió por una escala Likert de cuatro puntos. La estructura del instrumento fue evaluada mediante análisis factorial de componentes principales con rotación varimax en ambas muestras, logrando tres factores para cada grupo. La estructura factorial obtenida de las respuestas de los estudiantes universitarios sólo concordó ligeramente con lo reportado por Tomás-Sábado & Gómez-Benito (2002 en una muestra española equivalente. La consistencia interna del instrumento, medida con el alfa de Cronbach, en cada muestra indica para adultos mayores (.86 y para estudiantes (.83. Se obtuvieron propiedades psicométricas que la hacen recomendable para su uso en adultos mayores mexicanos. Finalmente, los resultados aportan nuevas evidencias sobre los efectos psicométricos derivados del posible impacto cultural de diferentes naciones de habla hispana y, entre generaciones.

  20. Mucormicosis: Una micosis emergente

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    Iris Tiraboschi

    2012-02-01

    Full Text Available El objetivo de este trabajo es presentar la incidencia, frecuencia, características clínicas y evolución de los pacientes con mucormicosis atendidos en el Hospital de Clínicas José de San Martín, Universidad de Buenos Aires, entre los años 1982 y 2010. Durante ese período se diagnosticaron 10 casos de mucormicosis. Los tres primeros entre 1982 y 2004 y los últimos 7 entre 2005 y 2010. La incidencia y frecuencia de esta enfermedad, para el período 1980-2004 fue 0.13 pacientes/año y 0.1 casos/10 000 egresos (IC 95%: 0.00 a 0.3 respectivamente. En el período 2005-2010 la incidencia fue 0.86 pacientes/año y la frecuencia de 1.1 casos/10 000 egresos (IC 95%: 0.5 a 2.4. Hubo nueve casos de mucormicosis rinosinuso-orbitaria, siete en pacientes con diabetes mellitus, uno en una paciente con una hemopatía maligna y neutropenia, y el restante en un paciente con HIV/sida que además estaba neutropénico y con un síndrome hemofagocítico. En una paciente se realizó el diagnóstico post mortem de mucormicosis pulmonar. El diagnóstico se efectuó por la observación de filamentos cenocíticos en los diez casos. Hubo desarrollo de mucorales en los cultivos de 8/9 pacientes; cinco Rhizopus spp y tres Mucor spp. Todos los pacientes recibieron un tratamiento inicial con anfotericina B deoxicolato, que en tres de ellos fue continuado con anfotericina B liposomal, y cirugía. Tres enfermos recibieron además un tratamiento adyuvante con oxigeno hiperbárico. La mortalidad fue 30%.

  1. El blindaje de una PC

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    Revista Chasqui

    2015-01-01

    Full Text Available La navegación en Internet y la consiguiente conexión a una red expone a una computadora a un sinfín de riesgos y peligros. Una PC que no sea utilizada para navegar en Internet o que no esté conectada a una red puede,incluso, ser también afectada por virus, por la utilización de disquetes contaminados que la contaminen con un virus. Para enfrentar esos problemas, la industria informática ha previsto una serie de protecciones y recaudos, de cuyo uso y utilización deben estar plenamente informados los usuarios de una PC.

  2. Resistencia de dientes restaurados con postes prefabricados ante cargas de máxima intercuspidación, masticación y bruxismo

    Directory of Open Access Journals (Sweden)

    Santiago Correa Vélez

    2013-03-01

    Full Text Available Objetivo: determinar por el método de los elementos finitos la resistencia de dientes restaurados con postes prefabricados ante cargas estáticas de máxima intercuspidación y cargas cíclicas de masticación y bruxismo y analizar el efecto de la pérdida periodontal en la resistencia de las restauraciones. Métodos: se realizó una investigación in vitro mediante el método de los elementos finitos de dientes con pérdida periodontal, rehabilitados con postes prefabricados en fibra de vidrio, carbono y titanio. Los dientes fueron reconstruidos a partir de imágenes tomográficas de un paciente periodontalmente sano. Resultados: se muestra que ante cargas estáticas las rehabilitaciones no presentan tendencia a la falla, independientemente del material del poste o del grado de pérdida periodontal. En el caso de bruxismo y pérdida periodontal de 4 mm, la dentina presenta una durabilidad de 60 000 ciclos independiente del material del poste. Para cargas de masticación y periodonto sano, la falla en la dentina ocurre a los 100 000 ciclos con poste en titanio, 200 000 ciclos con poste en fibra de carbono y 1 100 000 ciclos con poste en fibra de vidrio. Para una pérdida periodontal de 2 mm la durabilidad de la dentina se reduce a 4 000 ciclos con poste en titanio, 5 000 ciclos con poste en fibra de carbono y 7 000 ciclos con poste en fibra de vidrio. Para pérdida periodontal de 4 mm, la durabilidad de la dentina se estima en 1 000 ciclos, independientemente del material del poste utilizado. Conclusiones: ante carga estática de máxima intercuspidación las rehabilitaciones con postes prefabricados en fibra de vidrio, carbono y titanio no presentan tendencia a la falla, independientemente del grado de pérdida periodontal. Ante cargas cíclicas, los postes prefabricados presentan una vida útil infinita, y es la dentina la estructura más afectada ante dichos eventos.

  3. Graveyards on the Move: The Spatio-Temporal Distribution of Dead Ophiocordyceps-Infected Ants

    DEFF Research Database (Denmark)

    Pontoppidan, Maj-Britt; Himaman, Winanda; Hywel-Jones, Nigel L.

    2009-01-01

    rainforest. We established that high density aggregations exist (up to 26 dead ants/m2), which we coined graveyards. We further established that graveyards are patchily distributed in a landscape with no or very few O. unilateralis-killed ants. At some, but not all, spatial scales of analysis the density...... unilateralis, which is pan-tropical in distribution, causes infected worker ants to leave their nest and die under leaves in the understory of tropical rainforests. Working in a forest dynamic plot in Southern Thailand we mapped the occurrence of these dead ants by examining every leaf in 1,360 m2 of primary...... of dead ants correlated with temperature, humidity and vegetation cover. Remarkably, having found 2243 dead ants inside graveyards we only found 2 live ants of the principal host, ant Camponotus leonardi, suggesting that foraging host ants actively avoid graveyards. We discovered that the principal host...

  4. Alergias y el sistema inmune: una revisión desde el aula

    Directory of Open Access Journals (Sweden)

    Laura María González Ortíz

    2014-06-01

    Full Text Available Los alérgenos son antígenos que desencadenan una respuesta inmunológica exagerada en personas sensibles, esta respuesta se ve agravada en exposiciones posteriores al mismo antígeno. Existen diversos tipos de alergias, las alergias a inhalantes exteriores como al polen o a hongos; alergias a inhalantes interiores como a los artrópodos, animales, al polvo y al humo; alergia a la ingesta de alimentos y fármacos; alergias por inoculación, ya sea por picadura de insectos o fármacos y por último, alergias por contacto. De acuerdo con la interacción entre el anticuerpo y el antígeno, puede haber cuatro tipos diferentes de hipersensibilidad: Tipo I, II, III y IV; las diferentes reacciones y procesos que ocurren en cada una de ellas dependerán de la exposición al antígeno y la sensibilización del individuo. Una de las respuestas inmunológicas más estudiadas es la hipersensibilidad tipo I, donde se presenta una alergia mediada por los anticuerpos de tipo IgE que se encuentran unidos a la membrana de los mastocitos y basófilos, al unirse con el antígeno, se liberan diversas sustancias las cuales son las responsables de producir las manifestaciones clínicas características como anafilaxis, urticaria, sinusitis, rinitis, tos, estornudos, vómito, entre otros. Los índices de morbilidad por patologías causadas por alergias van en aumento, condiciones ambientales como el cambio climático, polución y procesos psicosociales como el estrés, permiten que las enfermedades por hipersensibilidad inmunológica se consideren relevantes tanto para clínicos como para investigadores de las ciencias básicas, lo que motiva académicamente la realización de esta revisión.

  5. Cuerpo y mente ante la muerte violenta

    OpenAIRE

    Luy Quijada, Jesús; Ramírez González, Maura

    2014-01-01

    La muerte es un tema que podría considerarse común y cotidiano dentro del campo de las ciencias forenses, pero se preguntarán qué tiene que ver la mente dentro de lo físico y sobre todo con la muerte y el cadáver, máxime si consideramos a este último como una fuente insustituible de información para despejar las incógnitas dentro de las investigaciones en los casos de muerte violenta. El cadáver no puede ser tomado como un ente separado ni únicamente físico, pues en los casos de muerte violen...

  6. Palladio y Piranesi ante las ruinas

    Directory of Open Access Journals (Sweden)

    Juan Calduch

    1998-12-01

    Full Text Available “Tanto Palladio como Piranesi se enfrentan con la herencia romana de las ruinas para extraer enseñanzas que afectan a la propia disciplina arquitectónica. Una disciplina que se revela autónoma e independiente de otras como la historia o la arqueología volcadas sobre el mismo objeto de estudio”. A partir de estas consideraciones y de un agudo análisis del diferente enfoque de estos arquitectos dibujando la misma arquitectura de las ruinas romanas, el autor extrae consecuencias sobre los intereses profesionales de los arquitectos cuando se enfrentan con la arquitectura monumental y la necesidad de recuperar un juicio crítico de las intervenciones actuales propio de la disciplina arquitectónica.

  7. El QUIJOTE, UN LIBRO ANTE SÍ MISMO

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    José Ricardo Morales

    2005-11-01

    Full Text Available En este ensayo se estima El Quijote como un libro que tiende a desvanecer cuanto haya en él de sustantivo; es decir, el autor, el lector, los personajes, los sucesos, el tiempo y los lugares. Dicha desustanciación, aquí considerada como una condición primordial del texto, fue propuesta insuficientemente por los críticos a partir de sus aspectos secundarios, entre ellos, el perspectivismo, la ironía, las duplicaciones o los espejismos que contieneThis essay views the Quijote as a book that tends to dissolve everything in it of substance, that is, the author, the reader, the characters, the events, the time and the place. Such de-substantiation, considered here as a primary condition of the text, was un insufficient proposal of the critics starting from its secondary aspects, among them, perspectivism, irony, the duplications and mitages the book contains

  8. SENSIBILIDAD DE LA RAZÓN DE MOROSIDAD Y LIQUIDEZ DEL SISTEMA BANCARIO NACIONAL ANTE CAMBIOS EN EL ENTORNO: UN ENFOQUE UTILIZANDO DATOS DE PANEL

    Directory of Open Access Journals (Sweden)

    Olivier Cruz Méndez

    2001-12-01

    Full Text Available El objetivo principal de este estudio es identificar algunas variables del entorno que afectan los indicadores financieros de morosidad y de liquidez en el sistema bancario costarricense, cuantificar su efecto y determinar el rezago con que dicho efecto se presenta ante cambios en algunas variables del entorno.Mediante la aplicación del enfoque de datos de panel, el estudio brinda los siguientes resultados: i en general, se determinó para los indicadores de morosidad crediticia y de liquidez que existe una reacción similar a nivel de sistema bancario ante cambios en las variables del entorno; no obstante, entre los bancos se presentan diferencias en su comportamiento particular, las que se asocian con aspectos de capacidad empresarial, políticas internas, eficiencia operativa, experiencia y tecnología, entre otros; iilas variables que afectan con mayor intensidad la morosidad son: la devaluación, la inflación, las nuevas colocaciones crediticias y el ritmo de la actividad económica local; iii por su parte, las variables que impactan el indicador de liquidez son: la emisión monetaria, las tasas de interés en colones, la tasa de subasta, la tasa de indiferencia y la morosidad de los bancos; iv además se efectuó una cuantificación porcentual sobre el impacto en ambos indicadores ante cambios en las variables relevantes, así como el rezago que mostró mayor significancia en cada una de las variables.Desde el punto de vista del Banco Central los resultados permiten identificar qué variables podrían generar problemas sistémicos en cada una de las áreas evaluadas, lo cual debe ser tomado en consideración dentro del Sistema de Indicadores de Alerta Temprana al que da seguimiento la División Económica.

  9. Various chemical strategies to deceive ants in three Arhopala species (lepidoptera: Lycaenidae exploiting Macaranga myrmecophytes.

    Directory of Open Access Journals (Sweden)

    Yoko Inui

    Full Text Available Macaranga myrmecophytes (ant-plants are generally well protected from herbivore attacks by their symbiotic ants (plant-ants. However, larvae of Arhopala (Lepidoptera: Lycaenidae species survive and develop on specific Macaranga ant-plant species without being attacked by the plant-ants of their host species. We hypothesized that Arhopala larvae chemically mimic or camouflage themselves with the ants on their host plant so that the larvae are accepted by the plant-ant species of their host. Chemical analyses of cuticular hydrocarbons showed that chemical congruency varied among Arhopala species; A. dajagaka matched well the host plant-ants, A. amphimuta did not match, and unexpectedly, A. zylda lacked hydrocarbons. Behaviorally, the larvae and dummies coated with cuticular chemicals of A. dajagaka were well attended by the plant-ants, especially by those of the host. A. amphimuta was often attacked by all plant-ants except for the host plant-ants toward the larvae, and those of A. zylda were ignored by all plant-ants. Our results suggested that conspicuous variations exist in the chemical strategies used by the myrmecophilous butterflies that allow them to avoid ant attack and be accepted by the plant-ant colonies.

  10. Leggere è una festa

    Directory of Open Access Journals (Sweden)

    Philippe Lejeune

    2011-04-01

    Full Text Available Come è possibile? Io, così agnostico, perché sono sollecitato da immagini religiose? Abbiamo inventato a poco a poco, dal 1992, poi ritualizzato, il nostro modo di fare. Una “liturgia” regola il corso delle nostre riunioni: è la “carta” dei gruppi di lettura. Le procedure devono essere le stesse in tutti i gruppi, al fine di garantire la coerenza di questo immenso lavoro. Vi è un’ortodossia, un’istanza di controllo che si preoccupa delle alterazioni delle regole, delle procedure d’invito … Come per gli ordini monastici c’è un noviziato (ogni nuovo partecipante è preso “in prova” in un gruppo e dei voti da pronunziare, in particolare quello di “leggere in simpatia” (su questo ci ritornerò dopo – voto di spoliazione di sé per aprirsi all’altro – scoprendo per gradi che non è facile come sembra.

  11. La ferrería de Pacho: una ventana de aproximación

    Directory of Open Access Journals (Sweden)

    Mächler T. Tatiana

    1984-12-01

    Full Text Available La curiosidad de mirar hacia atrás nos coloca ante un dilema: o aceptamos el nombre que se le da a los fantasmas y los damos por conocidos o tratamos de hablar con ellos. La primera alternativa nos exime de inquietudes si no hacemos preguntas. La segunda nos lleva a despojarnos de la "corporeidad" presente y a buscar ventanas de aproximación. Claro, esta aproximación no es del todo "natural", estamos en circunstancias y tiempos diferentes y la completa objetividad no nos es posible, pero no existe otro camino. Precisar la importancia de una ventana particular es difícil. Podemos ir abriendo una por una o varias a la vez. Depronto si las abrimos todas con un mismo viento perdemos la oportunidad de descubrir los diferentes matices y tonalidades, la oportunidad de percibir diferentes perspectivas.

  12. Neuromodulation of Nestmate Recognition Decisions by Pavement Ants.

    Directory of Open Access Journals (Sweden)

    Andrew N Bubak

    Full Text Available Ant colonies are distributed systems that are regulated in a non-hierarchical manner. Without a central authority, individuals inform their decisions by comparing information in local cues to a set of inherent behavioral rules. Individual behavioral decisions collectively change colony behavior and lead to self-organization capable of solving complex problems such as the decision to engage in aggressive societal conflicts with neighbors. Despite the relevance to colony fitness, the mechanisms that drive individual decisions leading to cooperative behavior are not well understood. Here we show how sensory information, both tactile and chemical, and social context-isolation, nestmate interaction, or fighting non-nestmates-affects brain monoamine levels in pavement ants (Tetramorium caespitum. Our results provide evidence that changes in octopamine and serotonin in the brains of individuals are sufficient to alter the decision by pavement ants to be aggressive towards non-nestmate ants whereas increased brain levels of dopamine correlate to physical fighting. We propose a model in which the changes in brain states of many workers collectively lead to the self-organization of societal aggression between neighboring colonies of pavement ants.

  13. Neuromodulation of Nestmate Recognition Decisions by Pavement Ants.

    Science.gov (United States)

    Bubak, Andrew N; Yaeger, Jazmine D W; Renner, Kenneth J; Swallow, John G; Greene, Michael J

    2016-01-01

    Ant colonies are distributed systems that are regulated in a non-hierarchical manner. Without a central authority, individuals inform their decisions by comparing information in local cues to a set of inherent behavioral rules. Individual behavioral decisions collectively change colony behavior and lead to self-organization capable of solving complex problems such as the decision to engage in aggressive societal conflicts with neighbors. Despite the relevance to colony fitness, the mechanisms that drive individual decisions leading to cooperative behavior are not well understood. Here we show how sensory information, both tactile and chemical, and social context-isolation, nestmate interaction, or fighting non-nestmates-affects brain monoamine levels in pavement ants (Tetramorium caespitum). Our results provide evidence that changes in octopamine and serotonin in the brains of individuals are sufficient to alter the decision by pavement ants to be aggressive towards non-nestmate ants whereas increased brain levels of dopamine correlate to physical fighting. We propose a model in which the changes in brain states of many workers collectively lead to the self-organization of societal aggression between neighboring colonies of pavement ants.

  14. Ants avoid superinfections by performing risk-adjusted sanitary care.

    Science.gov (United States)

    Konrad, Matthias; Pull, Christopher D; Metzler, Sina; Seif, Katharina; Naderlinger, Elisabeth; Grasse, Anna V; Cremer, Sylvia

    2018-03-13

    Being cared for when sick is a benefit of sociality that can reduce disease and improve survival of group members. However, individuals providing care risk contracting infectious diseases themselves. If they contract a low pathogen dose, they may develop low-level infections that do not cause disease but still affect host immunity by either decreasing or increasing the host's vulnerability to subsequent infections. Caring for contagious individuals can thus significantly alter the future disease susceptibility of caregivers. Using ants and their fungal pathogens as a model system, we tested if the altered disease susceptibility of experienced caregivers, in turn, affects their expression of sanitary care behavior. We found that low-level infections contracted during sanitary care had protective or neutral effects on secondary exposure to the same (homologous) pathogen but consistently caused high mortality on superinfection with a different (heterologous) pathogen. In response to this risk, the ants selectively adjusted the expression of their sanitary care. Specifically, the ants performed less grooming and more antimicrobial disinfection when caring for nestmates contaminated with heterologous pathogens compared with homologous ones. By modulating the components of sanitary care in this way the ants acquired less infectious particles of the heterologous pathogens, resulting in reduced superinfection. The performance of risk-adjusted sanitary care reveals the remarkable capacity of ants to react to changes in their disease susceptibility, according to their own infection history and to flexibly adjust collective care to individual risk.

  15. PARAMETER ESTIMATION OF VALVE STICTION USING ANT COLONY OPTIMIZATION

    Directory of Open Access Journals (Sweden)

    S. Kalaivani

    2012-07-01

    Full Text Available In this paper, a procedure for quantifying valve stiction in control loops based on ant colony optimization has been proposed. Pneumatic control valves are widely used in the process industry. The control valve contains non-linearities such as stiction, backlash, and deadband that in turn cause oscillations in the process output. Stiction is one of the long-standing problems and it is the most severe problem in the control valves. Thus the measurement data from an oscillating control loop can be used as a possible diagnostic signal to provide an estimate of the stiction magnitude. Quantification of control valve stiction is still a challenging issue. Prior to doing stiction detection and quantification, it is necessary to choose a suitable model structure to describe control-valve stiction. To understand the stiction phenomenon, the Stenman model is used. Ant Colony Optimization (ACO, an intelligent swarm algorithm, proves effective in various fields. The ACO algorithm is inspired from the natural trail following behaviour of ants. The parameters of the Stenman model are estimated using ant colony optimization, from the input-output data by minimizing the error between the actual stiction model output and the simulated stiction model output. Using ant colony optimization, Stenman model with known nonlinear structure and unknown parameters can be estimated.

  16. New fossil ants in French Cretaceous amber (Hymenoptera: Formicidae)

    Science.gov (United States)

    Perrichot, Vincent; Nel, André; Néraudeau, Didier; Lacau, Sébastien; Guyot, Thierry

    2008-02-01

    Recent studies on the ant phylogeny are mainly based on the molecular analyses of extant subfamilies and do not include the extinct, only Cretaceous subfamily Sphecomyrminae. However, the latter is of major importance for ant relationships, as it is considered the most basal subfamily. Therefore, each new discovery of a Mesozoic ant is of high interest for improving our understanding of their early history and basal relationships. In this paper, a new sphecomyrmine ant, allied to the Burmese amber genus Haidomyrmex, is described from mid-Cretaceous amber of France as Haidomyrmodes mammuthus gen. and sp. n. The diagnosis of the tribe Haidomyrmecini is emended based on the new type material, which includes a gyne (alate female) and two incomplete workers. The genus Sphecomyrmodes, hitherto known by a single species from Burmese amber, is also reported and a new species described as S. occidentalis sp. n. after two workers remarkably preserved in a single piece of Early Cenomanian French amber. The new fossils provide additional information on early ant diversity and relationships and demonstrate that the monophyly of the Sphecomyrminae, as currently defined, is still weakly supported.

  17. The cavity-nest ant Temnothorax crassispinus prefers larger nests.

    Science.gov (United States)

    Mitrus, S

    Colonies of the ant Temnothorax crassispinus inhabit mostly cavities in wood and hollow acorns. Typically in the field, nest sites that can be used by the ant are a limited resource. In a field experiment, it was investigated whether the ants prefer a specific size of nest, when different ones are available. In July 2011, a total of 160 artificial nests were placed in a beech-pine forest. Four artificial nests (pieces of wood with volume cavities, ca 415, 605, 730, and 980 mm 3 , respectively) were located on each square meter of the experimental plot. One year later, shortly before the emergence of new sexuals, the nests were collected. In July 2012, colonies inhabited more frequently bigger nests. Among queenright colonies, the ones which inhabited bigger nests had more workers. However, there was no relationship between volume of nest and number of workers for queenless colonies. Queenright colonies from bigger nests produced more sexual individuals, but there was no correlation between number of workers and sex allocation ratio, or between volume of nest and sex allocation ratio. In a laboratory experiment where ant colonies were kept in 470 and 860 mm 3 nests, larger colonies allocated more energy to produce sexual individuals. The results of this study show the selectivity of T. crassispinus ants regarding the size of nest cavity, and that the nest volume has an impact on life history parameters.

  18. Polarized light use in the nocturnal bull ant, Myrmecia midas.

    Science.gov (United States)

    Freas, Cody A; Narendra, Ajay; Lemesle, Corentin; Cheng, Ken

    2017-08-01

    Solitary foraging ants have a navigational toolkit, which includes the use of both terrestrial and celestial visual cues, allowing individuals to successfully pilot between food sources and their nest. One such celestial cue is the polarization pattern in the overhead sky. Here, we explore the use of polarized light during outbound and inbound journeys and with different home vectors in the nocturnal bull ant, Myrmecia midas . We tested foragers on both portions of the foraging trip by rotating the overhead polarization pattern by ±45°. Both outbound and inbound foragers responded to the polarized light change, but the extent to which they responded to the rotation varied. Outbound ants, both close to and further from the nest, compensated for the change in the overhead e-vector by about half of the manipulation, suggesting that outbound ants choose a compromise heading between the celestial and terrestrial compass cues. However, ants returning home compensated for the change in the e-vector by about half of the manipulation when the remaining home vector was short (1-2 m) and by more than half of the manipulation when the remaining vector was long (more than 4 m). We report these findings and discuss why weighting on polarization cues change in different contexts.

  19. Stigmergic construction and topochemical information shape ant nest architecture.

    Science.gov (United States)

    Khuong, Anaïs; Gautrais, Jacques; Perna, Andrea; Sbaï, Chaker; Combe, Maud; Kuntz, Pascale; Jost, Christian; Theraulaz, Guy

    2016-02-02

    The nests of social insects are not only impressive because of their sheer complexity but also because they are built from individuals whose work is not centrally coordinated. A key question is how groups of insects coordinate their building actions. Here, we use a combination of experimental and modeling approaches to investigate nest construction in the ant Lasius niger. We quantify the construction dynamics and the 3D structures built by ants. Then, we characterize individual behaviors and the interactions of ants with the structures they build. We show that two main interactions are involved in the coordination of building actions: (i) a stigmergic-based interaction that controls the amplification of depositions at some locations and is attributable to a pheromone added by ants to the building material; and (ii) a template-based interaction in which ants use their body size as a cue to control the height at which they start to build a roof from existing pillars. We then develop a 3D stochastic model based on these individual behaviors to analyze the effect of pheromone presence and strength on construction dynamics. We show that the model can quantitatively reproduce key features of construction dynamics, including a large-scale pattern of regularly spaced pillars, the formation and merging of caps over the pillars, and the remodeling of built structures. Finally, our model suggests that the lifetime of the pheromone is a highly influential parameter that controls the growth and form of nest architecture.

  20. DATA MINING UNTUK KLASIFIKASI PELANGGAN DENGAN ANT COLONY OPTIMIZATION

    Directory of Open Access Journals (Sweden)

    Maulani Kapiudin

    2007-01-01

    Full Text Available In this research the system for potentially customer classification is designed by extracting rule based classification from raw data with certain criteria. The searching process uses customer database from a bank with data mining technic by using ant colony optimization. A test based on min_case_per_rule variety and phenomene updating were done on a certain period of time. The result are group of customer class which base on rules built by ant and by modifying the pheromone updating, the area of the case is getting bigger. Prototype of the software is coded with C++ 6 version. The customer database master is created by using Microsoft Access. This paper gives information about potential customer of bank that can be classified by prototype of the software. Abstract in Bahasa Indonesia : Pada penelitian untuk sistem klasifikasi potensial customer ini didesain dengan melakukan ekstrak rule berdasarkan klasifikasi dari data mentah dengan kriteria tertentu. Proses pencarian menggunakan database pelanggan dari suatu bank dengan teknik data mining dengan ant colony optimization. Dilakukan percobaan dengan min_case_per_rule variety dan phenomene updating pada periode waktu tertentu. Hasilnya adalah sekelompok class pelanggan yang didasarkan dari rules yang dibangun dengan ant dan dengan dimodifikasi dengan pheromone updating, area permasalahan menjadi lebih melebar. Prototype dari software ini menggunakan C++ versi 6. Database pelanggan dibangun dengan Microsoft Access. Paper ini memberikan informasi mengenai potensi pelanggan dari bank, sehingga dapat diklasifikasikan dengan prototype dari software. Kata kunci: ant colony optimization, classification, min_case_per_rule, term, pheromone updating

  1. Channeler Ant Model: 3 D segmentation of medical images through ant colonies

    International Nuclear Information System (INIS)

    Fiorina, E.; Valzano, S.; Arteche Diaz, R.; Bosco, P.; Gargano, G.; Megna, R.; Oppedisano, C.; Massafra, A.

    2011-01-01

    In this paper the Channeler Ant Model (CAM) and some results of its application to the analysis of medical images are described. The CAM is an algorithm able to segment 3 D structures with different shapes, intensity and background. It makes use of virtual and colonies and exploits their natural capabilities to modify the environment and communicate with each other by pheromone deposition. Its performance has been validated with the segmentation of 3 D artificial objects and it has been already used successfully in lung nodules detection on Computer Tomography images. This work tries to evaluate the CAM as a candidate to solve the quantitative segmentation problem in Magnetic Resonance brain images: to evaluate the percentage of white matter, gray matter and cerebrospinal fluid in each voxel.

  2. HORMIGAS QUE (SE OBSESIONAN: UNA TRADUCCIÓN EN ORATURA

    Directory of Open Access Journals (Sweden)

    Kyle Wanberg

    2014-10-01

    Full Text Available En el presente estudio, se examina una traducción de las Canciones de las Hormigas (Ant Songs, de transmisión oral, del ‘akimel ‘o‘odham (pima al inglés y se hace hincapié en cómo los problemas de traducción transfiguran su recepción en tanto que obras literarias. Un análisis de su canto, su lenguaje, sus códigos culturales y su oralidad arroja algo de luz sobre un territorio extraordinariamente ambiguo. El estudio de esta y otras traducciones de oratura, incluidas las dificultades que estas ponen de manifiesto, puede enriquecer nuestra concepción tanto de la literatura como de la traducción.

  3. Encuentro con una máquina barroquizante

    Directory of Open Access Journals (Sweden)

    Edgar León Garavito P.

    1979-10-01

    Full Text Available Diez nuevas salas de exposición han sido inauguradas en el Museo del Prado en Madrid. Se ha aprovechado esta inauguración para presentar una muestra muy completa, ya exhibida antes en París y Burdeos, del a rte en la corte de España durante el siglo XVIII. Es posible reconocer allí, gracias a un montaje hecho con sentido didáctico, obras de pintores franceses, italianos y flamencos que, desde el acceso de la dinastía borbónica con Felipe V, introdujeron un carácter "cosmopolita" o por lo menos de apertura del arte cortesano español hacia el resto de Europa.

  4. Células dendríticas especializadas en presentación de antígenos exógenos a linfocitos T citotóxicos

    OpenAIRE

    C. Alfaro; C. Oñate; A. Rodríguez; J.L. Pérez-Gracia; M. Fernández de Sanmamed; I. Melero

    2013-01-01

    Las células dendríticas son células de origen hematopoiético, que expresan constitutivamente moléculas presentadoras de antígeno MHC de clase I y II, y son funcionalmente las inductoras más potentes de la activación y proliferación de linfocitos T a los que presentan antígenos. Los linfocitos T CD8+ proliferan y adquieren capacidad citotóxica cuando reconocen su antígeno específico presentado en la superficie de una o varias células dendríticas con las que interactúan. Sin embargo, solamente ...

  5. Desahuciando inmigrantes: una etnografía en una comunidad dañada

    Directory of Open Access Journals (Sweden)

    Ignasi Bernat Molina

    2014-09-01

    Full Text Available El derrumbe financiero y económico que se inició en 2007 en Estados Unidos después de la conocida como crisis de las hipotecas subprime se tornó global un año después. En España, uno de los países más afectados por la larga crisis, la prosperidad anterior enseguida pareció ser un espejismo. Pero la crisis no ha afectado a todo el mundo en la misma medida. De hecho, hay gente que se ha enriquecido durante el período 2008-2012, en cambio, la crisis está teniendo un impacto mayor sobre los que ya se encontraba en una situación más precaria. En este artículo discutiré una de las múltiples caras de la crisis española que está afectando a los más desaventajados: los desahucios y su resistencia por parte de la población migrante. Para hacer esto, primero examinaré un municipio que ha sido paradigmático de enclave migrante en España: Salt. Salt es un municipio conocido en Girona, Catalunya, por haber sido descrito en los medios de comunicación como un gueto como resultado de los problemas que surgen con el exceso de inmigración (el 42% de su población es de origen extranjero. Salt se hizo famoso cuando en marzo de 2010 un grupo de vecinos entró en el ayuntamiento exigiendo más seguridad y denunciando la pasividad de la policía ante una ola de robos en el pueblo. Desde entonces, distinto conflictos aparecen en los medios de comunicación. De todos modos, una etnografía desde una perspectiva criminológica muestra que el problema que aparece en los medios de comunicación (el delito callejero es solo uno entre los varios que afectan a la población. Peor aún, toda la atención puesta sobre el municipio por medios, políticos y policías no ha servido para la detección de un problema que está generando mucho más daño social: los desahucios. La crisis ha servido para observar el modus operandi de bancos y agencias inmobiliarias, los principales victimarios en el conflicto de los desahucios. Vendían pisos, nunca los

  6. Regulation and specificity of antifungal metapleural gland secretion in leaf-cutting ants

    DEFF Research Database (Denmark)

    Yek, Sze Huei; Nash, David Richard; Jensen, Annette Bruun

    2012-01-01

    significantly larger for ants challenged with virulent and mild pathogens/weeds than for controls and Escovopsis-challenged ants. We conclude that the MG defence system of leaf-cutting ants has characteristics reminiscent of an additional cuticular immune system, with specific and non-specific components......Ants have paired metapleural glands (MGs) to produce secretions for prophylactic hygiene. These exocrine glands are particularly well developed in leaf-cutting ants, but whether the ants can actively regulate MG secretion is unknown. In a set of controlled experiments using conidia of five fungi...

  7. Desarrollo Rural Endógeno: Condiciones para una Transición Agroecológica desde una Experiencia de Producción Orgánica

    OpenAIRE

    Santiago Peredo; Claudia Paz

    2002-01-01

    Ante la actual situación de marginalidad y desarticulación social en que se encuentra la agricultura familiar campesina en un mundo rural caracterizado por condiciones de pobreza tanto económica como ecológica, la Agroecología surge como una alternativa de desarrollo rural basada en estrategias que potencien tanto la diversidad ecológica como sociocultural de una comunidad.En este trabajo se discuten, a partir de un estudio de caso, las condiciones que se deben reunir en un proceso de transic...

  8. Discordia en la tienda de Abraham. Una relectura del gn 16, 1-21; 21, 1-21. Vientre en alquiler: una realidad bíblica, un problema moral de hoy

    OpenAIRE

    Cabrera Piñango, Gladys Rebeca

    2015-01-01

    Una de las experiencias más impactantes del estudio bíblico es el descubrimiento de la problemática del Vientre en alquiler en contextos tempranos de la historia de Israel. Hoy, ante los adelantos científicos en materia de reproducción humana, recordamos el texto y nos topamos con las implicaciones físicas, mentales y éticas de estas prácticas que utilizan los cuerpos de mujer como sustitutos mecánicos de la simiente masculina a su cumplimiento. En el primer capítulo se hace una lectura o...

  9. Reflexiones en torno a una conciliación: arquitectura en el territorio peruano en el siglo XVI

    Directory of Open Access Journals (Sweden)

    Martha Barriga Tello

    2011-05-01

    Full Text Available Ante la experiencia con el patrimonio arquitectónico peruano en el sigloXVI, la administración española enfrentó dificultades con las quedebió competir con ventaja. Algunos aspectos de nuestra arquitecturareligiosa coincidían con sus tradiciones, pero otras de manera ninguna;finalmente hubo consenso. Este artículo es una reflexión acerca de lasmotivaciones y las consecuencias de este resultado.

  10. Los desórdenes de la alimentación : una lectura psicoanalítica

    OpenAIRE

    Zusman Tinman, Lillyana

    2004-01-01

    El propósito del presente trabajo es describir el curso psicológico de los desórdenes alimentarios desde las perspectivas freudiana y posfreudiana. El valor de una aproximación histórica es que ésta se constituye en un antídoto tanto para la aceptación no crítica como para el rechazo no informado de las ideas. Tesis

  11. Tragedia y reflexión. Algunas observaciones sobre Antígona

    Directory of Open Access Journals (Sweden)

    Rocío ORSI

    2009-11-01

    Full Text Available RESUMEN: En la antigua Grecia la tragedia constituía no sólo una fuente de entretenimiento sino también, y sobre todo, un poderoso instrumento de reflexión práctica. De ese modo, aquí se propone una relectura de la tragedia de Antígona y un análisis del acto de desobediencia que ocupa el núcleo de la obra, para mostrar por qué medios el poeta induce a su público a una revisión profunda de sus creencias sobre lo el valor y sobre lo que significa actuar mal. La herramienta hermenéutica principal para valorar el alcance de esa reflexión en el seno de la sociedad ateniense será el examen de las reacciones que cabía esperar en el público que asistía a la representación.ABSTRACT: Greek tragedy was not only a source of entertainment but also, and most importantly, a powerful resource of moral and political thinking. From this perspective, my aim here is to propose a reading of the tragedy of Antigone centered in an analysis of the disobedience act that occupies the core part of the play. This account would try to make sense of the ways in which the Greek poet encouraged his audience to look through their conventions and beliefs, in willing to make them review their sense of what matters and what a bad action is. The main hermeneutical tool in order to do this will consist in exploring the reactions that those who assisted to the performance supposedly experienced.

  12. Application of chaotic ant swarm optimization in electric load forecasting

    International Nuclear Information System (INIS)

    Hong, W.-C.

    2010-01-01

    Support vector regression (SVR) had revealed strong potential in accurate electric load forecasting, particularly by employing effective evolutionary algorithms to determine suitable values of its three parameters. Based on previous research results, however, these employed evolutionary algorithms themselves have several drawbacks, such as converging prematurely, reaching slowly the global optimal solution, and trapping into a local optimum. This investigation presents an SVR-based electric load forecasting model that applied a novel algorithm, namely chaotic ant swarm optimization (CAS), to improve the forecasting performance by searching its suitable parameters combination. The proposed CAS combines with the chaotic behavior of single ant and self-organization behavior of ant colony in the foraging process to overcome premature local optimum. The empirical results indicate that the SVR model with CAS (SVRCAS) results in better forecasting performance than the other alternative methods, namely SVRCPSO (SVR with chaotic PSO), SVRCGA (SVR with chaotic GA), regression model, and ANN model.

  13. Social isolation and brain development in the ant Camponotus floridanus.

    Science.gov (United States)

    Seid, Marc A; Junge, Erich

    2016-06-01

    Social interactions play a key role in the healthy development of social animals and are most pronounced in species with complex social networks. When developing offspring do not receive proper social interaction, they show developmental impairments. This effect is well documented in mammalian species but controversial in social insects. It has been hypothesized that the enlargement of the mushroom bodies, responsible for learning and memory, observed in social insects is needed for maintaining the large social networks and/or task allocation. This study examines the impact of social isolation on the development of mushroom bodies of the ant Camponotus floridanus. Ants raised in isolation were shown to exhibit impairment in the growth of the mushroom bodies as well as behavioral differences when compared to ants raised in social groups. These results indicate that social interaction is necessary for the proper development of C. floridanus mushroom bodies.

  14. Effective ANT based Routing Algorithm for Data Replication in MANETs

    Directory of Open Access Journals (Sweden)

    N.J. Nithya Nandhini

    2013-12-01

    Full Text Available In mobile ad hoc network, the nodes often move and keep on change its topology. Data packets can be forwarded from one node to another on demand. To increase the data accessibility data are replicated at nodes and made as sharable to other nodes. Assuming that all mobile host cooperative to share their memory and allow forwarding the data packets. But in reality, all nodes do not share the resources for the benefits of others. These nodes may act selfishly to share memory and to forward the data packets. This paper focuses on selfishness of mobile nodes in replica allocation and routing protocol based on Ant colony algorithm to improve the efficiency. The Ant colony algorithm is used to reduce the overhead in the mobile network, so that it is more efficient to access the data than with other routing protocols. This result shows the efficiency of ant based routing algorithm in the replication allocation.

  15. Mating, hybridisation and introgression in Lasius ants (Hymenoptera: Formicidae)

    DEFF Research Database (Denmark)

    Van der Have, Tom; Pedersen, Jes Søe; Boomsma, Jacobus Jan

    2011-01-01

    Recent reviews have shown that hybridisation among ant species is likely to be more common than previously appreci-ated, but that documented cases of introgression remain rare. After molecular phylogenetic work had shown that Euro-pean Lasius niger (LINNAEUS, 1758) and L. psammophilus SEIFERT, 1992...... (formerly L. alienus (FOERSTER, 1850)) are unlikely to be very closely related, we decided to analyse an old data set confirming the conclusion by PEARSON (1983) that these two ants can indeed form viable hybrids. We show that signatures of introgression can be detected in a Danish site...... sympatrically. This would imply that multiple accessible field sites are available to study the molecular details of hybridisation and in-trogression between two ant species that have variable degrees of sympatry throughout their distributional ranges...

  16. Evolutionary patterns of proteinase activity in attine ant fungus gardens

    DEFF Research Database (Denmark)

    Semenova, Tatyana; Hughes, David Peter; Boomsma, Jacobus Jan

    2011-01-01

    hypothesized that fungal proteinase activity may have been under selection for efficiency and that different classes of proteinases might be involved. Results: We determined proteinase activity profiles across a wide pH range for fungus gardens of 14 Panamanian species of fungus-growing ants, representing...... classes. Remarkably, the single symbiont that is shared by species of the crown group of Atta and Acromyrmex leaf-cutting ants mostly showed metalloproteinase activity, suggesting that recurrent changes in enzyme production may have occurred throughout the domestication history of fungus-garden symbionts......Background: Attine ants live in symbiosis with a basidiomycetous fungus that they rear on a substrate of plant material. This indirect herbivory implies that the symbiosis is likely to be nitrogen deprived, so that specific mechanisms may have evolved to enhance protein availability. We therefore...

  17. Comparative Immature Morphology of Brazilian Fire Ants (Hymenoptera: Formicidae: Solenopsis

    Directory of Open Access Journals (Sweden)

    Eduardo Gonçalves Paterson Fox

    2012-01-01

    Full Text Available Although common in Brazil, the biology of the fire ant Solenopsis saevissima (Smith is still poorly studied. Larval descriptions are useful to genus-level ant systematics and sometimes to species-level taxonomy. This study presents a detailed description of juveniles of S. saevissima from Brazil, which were compared with Brazilian specimens of Solenopsis invicta Buren, Solenopsis geminata (Fabricius, and Solenopsis altipunctata Pitts. Different larval instars were separated by diagnostic morphological traits which were confirmed by observing moults. Reproductive larvae could be easily sorted by their distinctive body dimensions and shape. Contrary to previous reports on this species, the larvae of S. saevissima proved to be generally identical to those of S. invicta, while a few specimens resembled those of other close species, such as Solenopsis megergates Trager. Mature larvae thus presented considerable intraspecific variation in some characters recently proposed to aid fire ant species separation (morphology of head hairs.

  18. Social context predicts recognition systems in ant queens

    DEFF Research Database (Denmark)

    Dreier, Stéphanie Agnès Jeanine; d'Ettorre, Patrizia

    2009-01-01

    Recognition of group-members is a key feature of sociality. Ants use chemical communication to discriminate nestmates from intruders, enhancing kin cooperation and preventing parasitism. The recognition code is embedded in their cuticular chemical profile, which typically varies between colonies....... We predicted that ants might be capable of accurate recognition in unusual situations when few individuals interact repeatedly, as new colonies started by two to three queens. Individual recognition would be favoured by selection when queens establish dominance hierarchies, because repeated fights...... for dominance are costly; but it would not evolve in absence of hierarchies. We previously showed that Pachycondyla co-founding queens, which form dominance hierarchies, have accurate individual recognition based on chemical cues. Here, we used the ant Lasius niger to test the null hypothesis that individual...

  19. Natural selection drives the evolution of ant life cycles.

    Science.gov (United States)

    Wilson, Edward O; Nowak, Martin A

    2014-09-02

    The genetic origin of advanced social organization has long been one of the outstanding problems of evolutionary biology. Here we present an analysis of the major steps in ant evolution, based for the first time, to our knowledge, on combined recent advances in paleontology, phylogeny, and the study of contemporary life histories. We provide evidence of the causal forces of natural selection shaping several key phenomena: (i) the relative lateness and rarity in geological time of the emergence of eusociality in ants and other animal phylads; (ii) the prevalence of monogamy at the time of evolutionary origin; and (iii) the female-biased sex allocation observed in many ant species. We argue that a clear understanding of the evolution of social insects can emerge if, in addition to relatedness-based arguments, we take into account key factors of natural history and study how natural selection acts on alleles that modify social behavior.

  20. Native supercolonies of unrelated individuals in the invasive Argentine ant

    DEFF Research Database (Denmark)

    Pedersen, Jes Søe; Krieger, Michael J. B.; Vogel, Valérie

    2006-01-01

    organization is not only a key attribute responsible for the ecological dominance of these ants, but also an evolutionary paradox because relatedness between nestmates is effectively zero. Recently, it has been proposed that, in the Argentine ant, unicoloniality is a derived trait that evolved after its......Kinship among group members has long been recognized as a main factor promoting the evolution of sociality and reproductive altruism, yet some ants have an extraordinary social organization, called unicoloniality, whereby individuals mix freely among physically separated nests. This type of social...... with related individuals who are aggressive toward members of other colonies, we found that native populations also form supercolonies, and are effectively unicolonial. Moreover, just as in introduced populations, the relatedness between nestmates is not distinguishable from zero in these native range...

  1. Ants at Ton Nga Chang Wildlife Sanctuary, Songkhla

    Directory of Open Access Journals (Sweden)

    Watanasit, S.

    2005-03-01

    Full Text Available The aim of this study was to investigate diversity of ant at Ton Nga Chang Wildlife Sanctuary, Hat Yai, Songkhla. Three line transects (100 m each were randomly set up in 2 types of forest area, disturbed and undisturbed. Hand collecting (HC and leaf litter sampling (LL were applied for ant collection within a time limit of 30 minutes for each method. This study was carried out every month during Febuary 2002- Febuary 2003. The results showed that 206 species were placed under 8 subfamilies: Aenictinae, Cerapachyinae, Dolichoderinae, Formicinae, Leptanillinae, Myrmicinae, Ponerinae and Pseudomyrmecinae. Study sites and collection methods could divide ant species into 2 groups, whereas seasonal change could not distinguish the groups by DCA of multivariate analysis.

  2. Social isolation and brain development in the ant Camponotus floridanus

    Science.gov (United States)

    Seid, Marc A.; Junge, Erich

    2016-06-01

    Social interactions play a key role in the healthy development of social animals and are most pronounced in species with complex social networks. When developing offspring do not receive proper social interaction, they show developmental impairments. This effect is well documented in mammalian species but controversial in social insects. It has been hypothesized that the enlargement of the mushroom bodies, responsible for learning and memory, observed in social insects is needed for maintaining the large social networks and/or task allocation. This study examines the impact of social isolation on the development of mushroom bodies of the ant Camponotus floridanus. Ants raised in isolation were shown to exhibit impairment in the growth of the mushroom bodies as well as behavioral differences when compared to ants raised in social groups. These results indicate that social interaction is necessary for the proper development of C. floridanus mushroom bodies.

  3. Ant colonies prefer infected over uninfected nest sites

    DEFF Research Database (Denmark)

    Pontieri, Luigi; Vojvodic, Svjetlana; Graham, Riley

    2014-01-01

    with sporulating mycelium of the entomopathogenic fungus Metarhizium brunneum (infected nests), nests containing nestmates killed by freezing (uninfected nests), and empty nests. In contrast to the expectation pharaoh ant colonies preferentially (84%) moved into the infected nest when presented with the choice...... the high risk of epidemics in group-living animals. Choosing nest sites free of pathogens is hypothesized to be highly efficient in invasive ants as each of their introduced populations is often an open network of nests exchanging individuals (unicolonial) with frequent relocation into new nest sites...... and low genetic diversity, likely making these species particularly vulnerable to parasites and diseases. We investigated the nest site preference of the invasive pharaoh ant, Monomorium pharaonis, through binary choice tests between three nest types: nests containing dead nestmates overgrown...

  4. EVOLUTIONARY TRANSITIONS IN ENZYME ACTIVITY OF ANT FUNGUS GARDENS

    DEFF Research Database (Denmark)

    De Fine Licht, Henrik H; Schiøtt, Morten; Mueller, Ulrich G

    2010-01-01

    an association with a monophyletic clade of specialized symbionts. In conjunction with the transition to specialized symbionts, the ants advanced in colony size and social complexity. Here we provide a comparative study of the functional specialization in extracellular enzyme activities in fungus gardens across...... the attine phylogeny. We show that, relative to sister clades, gardens of higher-attine ants have enhanced activity of protein-digesting enzymes, whereas gardens of leaf-cutting ants also have increased activity of starch-digesting enzymes. However, the enzyme activities of lower-attine fungus gardens...... are targeted primarily towards partial degradation of plant cell walls, reflecting a plesiomorphic state of non-domesticated fungi. The enzyme profiles of the higher-attine and leaf-cutting gardens appear particularly suited to digest fresh plant materials and to access nutrients from live cells without major...

  5. Pericarpial nectary-visiting ants do not provide fruit protection against pre-dispersal seed predators regardless of ant species composition and resource availability.

    Directory of Open Access Journals (Sweden)

    Priscila Andre Sanz-Veiga

    Full Text Available Extrafloral nectaries can occur in both vegetative and reproductive plant structures. In many Rubiaceae species in the Brazilian Cerrado, after corolla abscission, the floral nectary continues to secret nectar throughout fruit development originating post-floral pericarpial nectaries which commonly attract many ant species. The occurrence of such nectar secreting structures might be strategic for fruit protection against seed predators, as plants are expected to invest higher on more valuable and vulnerable parts. Here, we performed ant exclusion experiments to investigate whether the interaction with ants mediated by the pericarpial nectaries of Tocoyena formosa affects plant reproductive success by reducing the number of pre-dispersal seed predators. We also assessed whether ant protection was dependent on ant species composition and resource availability. Although most of the plants were visited by large and aggressive ant species, such as Ectatomma tuberculatum and species of the genus Camponotus, ants did not protect fruits against seed predators. Furthermore, the result of the interaction was neither related to ant species composition nor to the availability of resources. We suggest that these results may be related to the nature and behavior of the most important seed predators, like Hemicolpus abdominalis weevil which the exoskeleton toughness prevent it from being predated by most ant species. On the other hand, not explored factors, such as reward quality, local ant abundance, ant colony characteristics and/or the presence of alternative energetic sources could also account for variations in ant frequency, composition, and finally ant protective effects, highlighting the conditionality of facultative plant-ant mutualisms.

  6. Agricultural matrices affect ground ant assemblage composition inside forest fragments.

    Directory of Open Access Journals (Sweden)

    Diego Santana Assis

    Full Text Available The establishment of agricultural matrices generally involves deforestation, which leads to fragmentation of the remaining forest. This fragmentation can affect forest dynamics both positively and negatively. Since most animal species are affected, certain groups can be used to measure the impact of such fragmentation. This study aimed to measure the impacts of agricultural crops (matrices on ant communities of adjacent lower montane Atlantic rainforest fragments. We sampled nine forest fragments at locations surrounded by different agricultural matrices, namely: coffee (3 replicates; sugarcane (3; and pasture (3. At each site we installed pitfall traps along a 500 m transect from the interior of the matrix to the interior of the fragment (20 pitfall traps ~25 m apart. Each transect was partitioned into four categories: interior of the matrix; edge of the matrix; edge of the fragment; and interior of the fragment. For each sample site, we measured ant species richness and ant community composition within each transect category. Ant richness and composition differed between fragments and matrices. Each sample location had a specific composition of ants, probably because of the influence of the nature and management of the agricultural matrices. Species composition in the coffee matrix had the highest similarity to its corresponding fragment. The variability in species composition within forest fragments surrounded by pasture was greatest when compared with forest fragments surrounded by sugarcane or, to a lesser extent, coffee. Functional guild composition differed between locations, but the most representative guild was 'generalist' both in the agricultural matrices and forest fragments. Our results are important for understanding how agricultural matrices act on ant communities, and also, how these isolated forest fragments could act as an island of biodiversity in an 'ocean of crops'.

  7. Agricultural matrices affect ground ant assemblage composition inside forest fragments.

    Science.gov (United States)

    Assis, Diego Santana; Dos Santos, Iracenir Andrade; Ramos, Flavio Nunes; Barrios-Rojas, Katty Elena; Majer, Jonathan David; Vilela, Evaldo Ferreira

    2018-01-01

    The establishment of agricultural matrices generally involves deforestation, which leads to fragmentation of the remaining forest. This fragmentation can affect forest dynamics both positively and negatively. Since most animal species are affected, certain groups can be used to measure the impact of such fragmentation. This study aimed to measure the impacts of agricultural crops (matrices) on ant communities of adjacent lower montane Atlantic rainforest fragments. We sampled nine forest fragments at locations surrounded by different agricultural matrices, namely: coffee (3 replicates); sugarcane (3); and pasture (3). At each site we installed pitfall traps along a 500 m transect from the interior of the matrix to the interior of the fragment (20 pitfall traps ~25 m apart). Each transect was partitioned into four categories: interior of the matrix; edge of the matrix; edge of the fragment; and interior of the fragment. For each sample site, we measured ant species richness and ant community composition within each transect category. Ant richness and composition differed between fragments and matrices. Each sample location had a specific composition of ants, probably because of the influence of the nature and management of the agricultural matrices. Species composition in the coffee matrix had the highest similarity to its corresponding fragment. The variability in species composition within forest fragments surrounded by pasture was greatest when compared with forest fragments surrounded by sugarcane or, to a lesser extent, coffee. Functional guild composition differed between locations, but the most representative guild was 'generalist' both in the agricultural matrices and forest fragments. Our results are important for understanding how agricultural matrices act on ant communities, and also, how these isolated forest fragments could act as an island of biodiversity in an 'ocean of crops'.

  8. Characterization of actinobacteria associated with three ant-plant mutualisms.

    Science.gov (United States)

    Hanshew, Alissa S; McDonald, Bradon R; Díaz Díaz, Carol; Djiéto-Lordon, Champlain; Blatrix, Rumsaïs; Currie, Cameron R

    2015-01-01

    Ant-plant mutualisms are conspicuous and ecologically important components of tropical ecosystems that remain largely unexplored in terms of insect-associated microbial communities. Recent work has revealed that ants in some ant-plant systems cultivate fungi (Chaetothyriales) within their domatia, which are fed to larvae. Using Pseudomyrmex penetrator/Tachigali sp. from French Guiana and Petalomyrmex phylax/Leonardoxa africana and Crematogaster margaritae/Keetia hispida, both from Cameroon, as models, we tested the hypothesis that ant-plant-fungus mutualisms co-occur with culturable Actinobacteria. Using selective media, we isolated 861 putative Actinobacteria from the three systems. All C. margaritae/K. hispida samples had culturable Actinobacteria with a mean of 10.0 colony forming units (CFUs) per sample, while 26 % of P. penetrator/Tachigali samples (mean CFUs 1.3) and 67 % of P. phylax/L. africana samples (mean CFUs 3.6) yielded Actinobacteria. The largest number of CFUs was obtained from P. penetrator workers, P. phylax alates, and C. margaritae pupae. 16S rRNA gene sequencing and phylogenetic analysis revealed the presence of four main clades of Streptomyces and one clade of Nocardioides within these three ant-plant mutualisms. Streptomyces with antifungal properties were isolated from all three systems, suggesting that they could serve as protective symbionts, as found in other insects. In addition, a number of isolates from a clade of Streptomyces associated with P. phylax/L. africana and C. margaritae/K. hispida were capable of degrading cellulose, suggesting that Streptomyces in these systems may serve a nutritional role. Repeated isolation of particular clades of Actinobacteria from two geographically distant locations supports these isolates as residents in ant-plant-fungi niches.

  9. Papel de la Universidad para elevar la preparación de la población ante la ocurrencia de desastres

    Directory of Open Access Journals (Sweden)

    Yarileisy Medina-De la Paz

    2017-11-01

    Full Text Available La universidad cubana juega un papel determinante en la formación y educación de una cultura ambiental en la reducción de riesgos ante el cambio climático. En función de elevar la capacidad de respuesta de la población ante la ocurrencia de un desastre hidrometeorológico, la sede universitaria de Yateras, a través de su labor de extensión, desarrolla un trabajo que se sustenta en el diseño de un conjunto de actividades organizadas en talleres, conferencias, videos debates, las que se explican en el presente trabajo.

  10. Factores biopsicosociales asociados a la disfunción sexual femenina en una población mexicana

    OpenAIRE

    Vega M, Genaro; Flores C, Patricia Jezabel; Ávila M, Javier; Becerril S, Alma; Vega M, Alfredo Jesús; Camacho C, Nicolás; García S, Pablo

    2014-01-01

    Objetivo: Determinar los factores biopsicosociales asociados a la disfunción sexual femenina en una población mexicana. Métodos: Estudio comparativo en mujeres que acudieron como acompañantes a una Unidad de Medicina Familiar de Querétaro, México. Se aplicaron las encuestas de Laumman, Chávez y Velazco, Faces III, y Grajales para valorar sexualidad, funcionalidad conyugal, funcionalidad familiar y estado de la autoestima. Los resultados fueron analizados con Odds Ratios, Chi cuadrado y t de S...

  11. ¿Qué es en verdad el dinero? Una teoría sobre la naturaleza del dinero

    OpenAIRE

    Ramos-Arévalo, J.M. (Javier María)

    2008-01-01

    Sorprende descubrir que no hay una definición de dinero que sea admitida deforma universal. No hay una explicación de la naturaleza del dinero que justifique todas sus funciones y características. Este trabajo pretende demostrar que el dinero es ante todo un derecho, y que considerarlo un derecho nos puede permitir aclarar los enigmas del dinero. Existe bastante acuerdo sobre para qué surge el dinero, pero debemos preguntarnos el cómo, y a partir del ahí explicar de dónde le vi...

  12. Aspectos prácticos para la regulación y puesta a punto de una sembradora

    OpenAIRE

    García Ramos, Francisco Javier; Diezma Iglesias, Belen

    2005-01-01

    La labor de siembra es clave dentro de cualquier proceso productivo. Buena parte del éxito de dicha labor depende de la elección de una sembradora adecuada y de su correcta regulación y puesta a punto. Por lo tanto, es vital realizar una revisión de la máquina antes de la campala de siembra y es aquí donde entra en juego la facilidad de manejo y regulación del equipo.

  13. Balance en el XX Aniversario de Lorenzo Milani y la «carta de una maestra»

    Directory of Open Access Journals (Sweden)

    José Luis CORZO TORAL

    2010-03-01

    Full Text Available RESUMEN: El 26 de junio de 1967 moría en Florencia y era enterrado en el minúsculo cementerio de Barbiana, a 50 km., Lorenzo Milani, párroco y maestro libre de aquella aldea de montaña del bajo Apenino toscano. Un par de meses antes había recibido en el hospital, donde una larga leucemia acababa con él a los 44 años, el primer ejemplar de Lettera a una Professoressa, escrita colectivamente por algunos de sus alumnos.

  14. Aprender enseñando : una propuesta de organización de la asignatura Conocimiento del Medio Natural

    Directory of Open Access Journals (Sweden)

    María del Carmen de Lemus Varela

    2013-05-01

    Full Text Available Para acercarnos al EESS es necesario adecuar los programas actuales centrándolos en el desarrollo de competencias. Aquí se presenta una posibilidad de trabajo en una asignatura troncal de las Titulaciones de Maestro de Primaria que trata de motivar al estudiante hacia el trabajo en equipo, la preparación de recursos didácticos novedosos y la reflexión ante los métodos de aprendizaje de las ciencias naturales por los universitarios a través de la lectura de textos para niños.

  15. Desarrollo y caracterización de una capa de biopolímero sobre titanio con efectos antibacterianos

    OpenAIRE

    Avilés Palou, Marc

    2013-01-01

    La major part de restauracions protèsiques dentals es realitzen mitjançant una estructura suportada per implants dentals de titani comercialment pur, amb una taxa d’èxit molt elevada. Tot i això, existeixen problemes de fracàs dels implants dentals. Aquests problemes son deguts, en un percentatge elevat de casos, a la formació d’un biofilm bacterià que produeix periimplantitis i pèrdua de l’os al voltant del implant, derivant en el fracàs del mateix. En aquest projecte es de...

  16. Páginas para una historia de las comunicaciones ópticas y la fotónica

    OpenAIRE

    Martín Pereda, José Antonio

    2001-01-01

    Este trabajo es el resultado de una parte del curso "Fundamentos Electrónicos de las Comunicaciones" (2001) que los Departamentos del Área de "Tecnología Electrónica" de la ETSIT UPM llevan Impartiendo, con carácter de asignatura Optativa, durante los últimos tres años. El material recogido a los largo de estos años se ha ido acumulando en una larga serie de transparencias que están esperando adquirir la forma de un breve texto escrito. Antes de que esto se convierta en realidad el a...

  17. Una revista distinta: Ellas

    Directory of Open Access Journals (Sweden)

    Requena Hidalgo, Cora

    2014-06-01

    Full Text Available This article focuses on the women’s magazine Ellas, published in the mid-nineteenth century in Madrid, and discusses its relationship with other approximately contemporary magazines and newspapers in order to contribute to a reconstruction of the history of women’s publications in the Spanish press. The approach is based on an analysis of the text of each issue of the magazine and comparison with other publications, where applicable. Key features of the article include a reflection on the social rights of women, an attempt to analyse the main differences between women and men and defining features of sexual gender, the need for women’s education, etc. Studying the magazine’s content clearly reveals a continual tension between progressive and conservative ideas typical of the historical context in which gender studies emerged in Spain.Este artículo centra su atención en la revista para mujeres Ellas, publicada a mediados del siglo XIX en Madrid. Analiza, asimismo, la relación de esta publicación con algunas otras revistas y periódicos de su contexto histórico próximo, con el fin de contribuir a la reconstrucción de una Historia de las publicaciones para mujeres en la prensa española. Para ello se utiliza el análisis de textos que forman parte de los números que componen la revista, así como el análisis comparativo entre publicaciones, cuando es pertinente. Entre los aspectos de mayor interés que el artículo pone de relieve se encuentra la reflexión sobre los derechos sociales de las mujeres, el intento de análisis de las principales diferencias entre mujeres y hombres y de los rasgos definitorios de los géneros sexuales, la necesidad de educación de las mujeres, entre otros. El estudio del contenido de la publicación revela claramente una tensión contradictoria continua entre las ideas progresistas y las ideas conservadoras propias del momento histórico que dieron origen en España al nacimiento de los estudios de género.

  18. Una visita a Buero Vallejo

    Directory of Open Access Journals (Sweden)

    Luis Navarro

    1962-06-01

    Full Text Available Si usted, que ha visto representadas o ha leído "Historia de una escalera", "En la ardiente oscuridad", "Meninas", quiere conocer a su autor, véngase conmigo. Ande, apurémonos: la cita es para la una y media y ya son las dos.

  19. The effects of food presentation and microhabitat upon resource monopoly in a ground-foraging ant (Hymenoptera: Formicidae community

    Directory of Open Access Journals (Sweden)

    Terrence P McGlynn

    2000-06-01

    Full Text Available In Neotropical wet forests several species of omnivorous, resource-defending ants, live and forage in close proximity to one another. Although the forest floor is heterogeneous in microhabitat and food quantity, little is known about the impact of microhabitat and food variation upon resource monopoly among ants. We investigated how food type and microhabitat influence food monopoly in resource-defending ants in old-growth tropical wet forest in the Caribbean lowlands of Costa Rica. We measured several microhabitat characteristics at 66 points in a 0.5 hectare plot, and baited each point with two categories of tuna bait. These baits were presented in "split" and "clumped" arrangements. We measured the frequency of bait monopoly by a single species, as well as the number of recruited ant foragers at a bait. Out of five common species, two (Wasmannia auropunctata and Pheidole simonsi more frequently monopolized one bait type over the other, and one (P. simonsi recruited more ants to the split baits. We then considered the recruitment response by all ant species in the community. We found that the frequency of monopoly, sharing, and the absence of ants at a given point in the rainforest differed with bait type. The frequency of monopoly was associated with microhabitat type in two out of eight microhabitat variables (leaf litter depth and palms; variation in two other types (canopy tree distance and leafcutter ant trails was associated with changes in forager number. In at least two ant species, food presentation affected monopoly at baits; among all resource-defending ants, the microhabitats where ants foraged for food and the type of food located determined in part the frequency of monopoly and the number of foragers at the food item. These results suggest that the location and presentation of food items determines in part which ant species will utilize the resource.En los bosques húmedos de la Región Neotropical conviven varias especies de

  20. Plant genotype shapes ant-aphid interactions: implications for community structure and indirect plant defense.

    Science.gov (United States)

    Mooney, Kailen A; Agrawal, Anurag A

    2008-06-01

    Little is known about the mechanisms by which plant genotype shapes arthropod community structure. In a field experiment, we measured the effects of milkweed (Asclepias syriaca) genotype and ants on milkweed arthropods. Populations of the ant-tended aphid Aphis asclepiadis and the untended aphid Myzocallis asclepiadis varied eight- to 18-fold among milkweed genotypes, depending on aphid species and whether ants were present. There was no milkweed effect on predatory arthropods. Ants increased Aphis abundance 59%, decreased Myzocallis abundance 52%, and decreased predator abundance 56%. Milkweed genotype indirectly influenced ants via direct effects on Aphis and Myzocallis abundance. Milkweed genotype also modified ant-aphid interactions, influencing the number of ants attracted per Aphis and Myzocallis. While ant effects on Myzocallis were consistently negative, effects on Aphis ranged from antagonistic to mutualistic among milkweed genotypes. As a consequence of milkweed effects on ant-aphid interactions, ant abundance varied 13-fold among milkweed genotypes, and monarch caterpillar survival was negatively correlated with genetic variation in ant abundance. We speculate that heritable variation in milkweed phloem sap drives these effects on aphids, ants, and caterpillars. In summary, milkweed exerts genetic control over the interactions between aphids and an ant that provides defense against foliage-feeding caterpillars.

  1. Intrapopulation differences in ant eating in the mountain gorillas of Bwindi Impenetrable National Park, Uganda.

    Science.gov (United States)

    Ganas, Jessica; Robbins, Martha M

    2004-10-01

    Variability in ant eating has been observed in several populations of eastern and western gorillas. We investigated the occurrence of ant (Dorylus sp.) eating in two groups of mountain gorillas (Gorilla beringei beringei) with overlapping home ranges within Bwindi Impenetrable National Park, Uganda from September 2001 to August 2002. We calculated the frequency of ant eating by an indirect method of analyzing fecal samples from silverbacks, adult females, and juveniles. One group consumed ants significantly more often than the other (3.3 vs 17.6% of days sampled). Furthermore, the group that consumed ants more often also consumed them on a seasonal basis (September-February monthly range: 0-8%; March-August monthly range: 30-42.9%). Finally, females and juveniles of this group consumed ants significantly more often than did the silverback (total samples containing ants: silverback, 2.1%; adult female, 13.2%; juvenile, 11.2%). Differences in ant eating between groups are likely due to variability in use of habitats where ants occur (particularly secondary forests). Surveys of ant densities in differing habitats, nutritional analysis of ants, and quantification of the amount of ants in their diets are necessary to understand if ant consumption is due to availability, nutritional value, group traditions, or taste preference.

  2. Five new records of ants (Hymenoptera: Formicidae) from Morocco.

    Science.gov (United States)

    Taheri, Ahmed; Reyes-López, Joaquin L

    2015-01-01

    A recent catalogue of the rich ant fauna of Morocco included 214 species, with later studies adding an additional 12 species. Following recent fieldwork in the north of Morocco, we report five new records for the country (Plagiolepis pygmaea Latreille, 1798, Ponera testacea Emery, 1895, Strumigenys tenuipilis Emery, 1915, Temnothorax pardoi Tinaut, 1987, and Tetramorium parvioculum Guillem & Bensusan, 2009) and we present new data on the distribution and natural history of six additional species. This work brings the total number of ants known from Morocco to 233, taking into account two species which were omitted in the list of Cagniant. © Crown copyright 2015.

  3. Core Business Selection Based on Ant Colony Clustering Algorithm

    Directory of Open Access Journals (Sweden)

    Yu Lan

    2014-01-01

    Full Text Available Core business is the most important business to the enterprise in diversified business. In this paper, we first introduce the definition and characteristics of the core business and then descript the ant colony clustering algorithm. In order to test the effectiveness of the proposed method, Tianjin Port Logistics Development Co., Ltd. is selected as the research object. Based on the current situation of the development of the company, the core business of the company can be acquired by ant colony clustering algorithm. Thus, the results indicate that the proposed method is an effective way to determine the core business for company.

  4. Significance of chemical recognition cues is context dependent in ants

    DEFF Research Database (Denmark)

    Bos, N.; Guerrieri, F.J.; d'Ettorre, P.

    2010-01-01

    signatures, composed primarily of long-chain cuticular hydrocarbons. These signatures are colony specific and allow discrimination between nestmates and non-nestmates. Nevertheless, the mechanisms underlying detection, perception and information processing of chemical signatures are poorly understood. It has...... context, affects aggression against non-nestmates carrying the hydrocarbon profile associated with food. Individual ant workers were able to associate the non-nestmate chemical profile with food. However, conditioned ants were still aggressive when encountering a non-nestmate carrying the odour profile...

  5. Mutualistic fungi control crop diversity in fungus-growing ants

    DEFF Research Database (Denmark)

    Poulsen, Michael; Boomsma, Jacobus J

    2005-01-01

    Leaf-cutting ants rear clonal fungi for food and transmit the fungi from mother to daughter colonies so that symbiont mixing and conflict, which result from competition between genetically different clones, are avoided. Here we show that despite millions of years of predominantly vertical...... transmission, the domesticated fungi actively reject mycelial fragments from neighboring colonies, and that the strength of these reactions are in proportion to the overall genetic difference between these symbionts. Fungal incompatibility compounds remain intact during ant digestion, so that fecal droplets...

  6. Are queen ants inhibited by their own pheromone?

    DEFF Research Database (Denmark)

    Holman, L.; Leroy, C.; Jørgensen, Charlotte

    2013-01-01

    . Communication in social insects is predominantly chemical, and the mechanisms regulating processes such as reproductive division of labor are becoming increasingly well understood. Recently, a queen cuticular hydrocarbon (3-MeC31) that inhibits worker reproduction and aggression was isolated in the ant Lasius...... niger. Here, we find that this pheromone also has a weak negative effect on queen productivity and oogenesis. Because 3-MeC31 is present on both queens and their brood, we suggest that it is used by ants of both castes to adjust their fecundity to the amount of developing brood and the presence of other...

  7. Sperm storage induces an immunity cost in ants

    DEFF Research Database (Denmark)

    Baer, Boris; Armitage, Sophie A O; Boomsma, Jacobus J

    2006-01-01

    Ant queens are among the most long-lived insects known. They mate early in adult life and maintain millions of viable sperm in their sperm storage organ until they die many years later. Because they never re-mate, the reproductive success of queens is ultimately sperm-limited, but it is not known...... what selective forces determine the upper limit to sperm storage. Here we show that sperm storage carries a significant cost of reduced immunity during colony founding. Newly mated queens of the leaf-cutting ant Atta colombica upregulate their immune response shortly after completing their nest burrow...

  8. The search rate of the African weaver ant in cashew

    DEFF Research Database (Denmark)

    Henriksen, Signe; Axelsen, Jørgen Aagaard; Lemming, Katrine Hansen

    2015-01-01

    Oecophylla longinoda is a species of eusocial colony living ants that prey upon other insects to feed their larva. Many of these insects are considered pests. An ecosystem model of the interactions between an O. longinoda colony and its potential prey is under construction by the team behind...... this article, and it is unknown which functional response equations are useful for eusocial insect colonies. We investigated the search rate of O. longinoda using artificial feeding experiments in a Tanzanian cashew (Anacardium occidentale L.) orchard to determine the search efficiency of the ants...

  9. Application of ant colony optimization in NPP classification fault location

    International Nuclear Information System (INIS)

    Xie Chunli; Liu Yongkuo; Xia Hong

    2009-01-01

    Nuclear Power Plant is a highly complex structural system with high safety requirements. Fault location appears to be particularly important to enhance its safety. Ant Colony Optimization is a new type of optimization algorithm, which is used in the fault location and classification of nuclear power plants in this paper. Taking the main coolant system of the first loop as the study object, using VB6.0 programming technology, the NPP fault location system is designed, and is tested against the related data in the literature. Test results show that the ant colony optimization can be used in the accurate classification fault location in the nuclear power plants. (authors)

  10. Sex-specific kleptoparasitic foraging in ant-eating spiders

    DEFF Research Database (Denmark)

    Martisová, Martina; Bilde, T.; Pekar, Stano

    2009-01-01

    . To investigate this hypothesis, we studied the effect of sex and life history stage on the frequency of kleptoparasitism in ant-eating spiders of the genus Zodarion in the field. These spiders use a special capture technique involving a quick attack on an ant that is left unguarded by spiders for several minutes......, providing ample opportunities for kleptoparasitism. We found that adult females consistently hunted actively, while adult males ceased active prey capture and instead engaged in kleptoparasitism. Juvenile spiders were active hunters irrespective of sex. Consistent with an ontogenetic shift in foraging...

  11. Gnomon una indagine sul numero

    CERN Document Server

    Zellini, Paolo

    1999-01-01

    Lo "gnomone" di cui si parla in questo libro non è quello stilo, più o meno monumentale, la cui ombra indica l'ora solare, ma un semplice strumento matematico: una figura geometrica, piana o solida, che aggiunta a un'altra ne genera una simile. Si tratta quindi di una tecnica, ampiamente diffusa nell'antichità, atta a ingrandire o rimpicciolire una forma conservandone l'aspetto. Lo gnomone non aveva solo importanza geometrica. Dalla semplice operazione di correzione "gnomonica" di una figura sono dipesi infatti la stessa nozione di numero, la definizione di vari concetti dell'Analisi e alcuni tra i principali algoritmi numerici e algebrici della matematica.

  12. Una Historia Artificial del Estudio de la mente; en busca de su “objeto”.

    Directory of Open Access Journals (Sweden)

    Roberto Polanco-Carrasco

    2009-01-01

    Full Text Available En diferentes momentos de la historia humana se ha buscado el lugar u origen del saber, los pensamientos y las emociones, planteando por ejemplo, que se piensa con el riñón, el corazón o el hígado, incluso con la sangre, ya que si se perdía gran cantidad de esta, se perdía también la conciencia. Con los actuales avances tecnológicos, se observa una curiosa sensación en los investigadores, de estar -más convencidos que nunca- que el cerebro tiene algo o todo que ver con lo mental. Sin embargo, no se debería olvidar que la tecnología es sólo una herramienta, no una disciplina, y por tanto, antes de maravillarse ciegamente por los avances en la técnica, se debe mirar en perspectiva el desarrollo histórico de cualquier disciplina. Como una manera de contribuir, dentro de la formación académica, a una mirada en perspectiva frente a los diversos intentos de explicar y organizar la mente, se realiza una revisión histórica de diversos hitos asociados con su estudio, reformulando sus influencias dentro de la génesis y evolución de disciplinas como; medicina, filosofía, neurología, psiquiatría y psicología.

  13. ¿ Como se hace una Telenovela ?

    Directory of Open Access Journals (Sweden)

    Iván Gavaldón

    2015-01-01

    Full Text Available La autora relata la historia de las Relaciones Públicas y dice que surgieron y se desarrollaron para legitimar ante el público los intereses económicos y políticos de quienes detentan el poder. Se cuestiona sobre el por qué no aplicar las relaciones públicas, en organizaciones populares, para que mejoren su publicación y orienten sus propósitos de desarrollo. El tema que aborda las Políticas culturales en América Latina acopia un extracto de lo más trascendente de los ensayos del libro editado por Néstor García Canclini. Sobre la telenovela se afirma que esta ha llegado a ser uno de los instrumentos más importantes de la comunicación popular: por ella desfilan las identidades de las más variadas culturas brasileñas. Y en cuanto a la caricatura se relata lo que ocurrió en el Seminario taller " Caricatura y Periodismo", realizado el(9-11 de Nov.- 1987 en el CIESPAL. El estudio sobre el mercado del vídeo se ve dificultado por la imprecisión de los datos obtenidos. Los datos oficiales no siempre se aproximan a la realidad, pues el mercado de vídeo se instauró en América Latina partiendo de una lógica totalmente diversa de los equipos de sonido e imagen.

  14. El profesional de enfermería ante el duelo por muerte perinatal

    Directory of Open Access Journals (Sweden)

    Carmen Stella Martínez Dávalos

    2018-03-01

    Full Text Available Introducción: Enfermería cuida al ser humano en la salud y en la enfermedad, desde la concepción hasta la muerte. En el área de obstetricia, es determinante el cuidado a la puérpera y la actitud del profesional, especialmente cuando el producto de la concepción fallece antes de nacer o en los primeros minutos de vida. Objetivo: Determinar la relación que existe entre la actitud del Profesional de Enfermería ante el manejo del duelo en su factor cognitivo y conductual y el cuidado ofrecido a la puérpera en duelo por muerte perinatal en su factor necesidades psicológicas y necesidades espirituales. Métodos: Fue realizado en las Unidades de Atención del Departamento de Ginecobstetricia del Hospital Universitario “Dr. Antonio María Pineda” de Barquisimeto, Estado Lara. Se utilizó un diseño no experimental, tipo transeccional correlacional/causal, el análisis de los datos se realizó a través del test de Chí cuadrado y Fischer. Resultados: Predominan los sentimientos negativos hacia la muerte por parte de los Profesionales de Enfermería, no siendo determinantes en el incremento de la eficiencia o deficiencia en la atención prestada.  Se evidencio un vacío teórico en cuanto los conocimientos y destrezas que debe manejar el profesional con respecto a la muerte, el duelo y como enfrentar estos, aun cuando el 70% de los profesionales son egresados universitarios. Conclusiones: Es necesario revisar los currículos de enfermería y capacitar en ejercicio sobre el manejo del duelo. Asimismo, crear grupos de apoyo para los profesionales de salud y los padres que sufren una perdida perinatal.

  15. Conflict over reproduction in an ant-plant symbiosis: why Allomerus octoarticulatus ants sterilize Cordia nodosa trees.

    Science.gov (United States)

    Frederickson, Megan E

    2009-05-01

    The evolutionary stability of mutualism is thought to depend on how well the fitness interests of partners are aligned. Because most ant-myrmecophyte mutualisms are persistent and horizontally transmitted, partners share an interest in growth but not in reproduction. Resources invested in reproduction are unavailable for growth, giving rise to a conflict of interest between partners. I investigated whether this explains why Allomerus octoarticulatus ants sterilize Cordia nodosa trees. Allomerus octoarticulatus nests in the hollow stem domatia of C. nodosa. Workers protect C. nodosa leaves against herbivores but destroy inflorescences. Using C. nodosa trees with Azteca ants, which do not sterilize their hosts, I cut inflorescences off trees to simulate sterilization by A. octoarticulatus. Sterilized C. nodosa grew faster than control trees, providing evidence for a trade-off between growth and reproduction. Allomerus octoarticulatus manipulates this trade-off to its advantage; sterilized trees produce more domatia and can house larger, more fecund colonies.

  16. The genomic impact of 100 million years of social evolution in seven ant species

    DEFF Research Database (Denmark)

    Gadau, Jürgen; Helmkampf, Martin; Nygaard, Sanne

    2012-01-01

    Ants (Hymenoptera, Formicidae) represent one of the most successful eusocial taxa in terms of both their geographic distribution and species number. The publication of seven ant genomes within the past year was a quantum leap for socio- and ant genomics. The diversity of social organization in ants...... between social and solitary insects, as well as among ant species. Altogether, these seven ant genomes open exciting new research avenues and opportunities for understanding the genetic basis and regulation of social species, and adaptive complex systems in general....... makes them excellent model organisms to study the evolution of social systems. Comparing the ant genomes with those of the honeybee, a lineage that evolved eusociality independently from ants, and solitary insects suggests that there are significant differences in key aspects of genome organization...

  17. Impact of imidacloprid on new queens of imported fire ants, Solenopsis invicta (Hymenoptera: Formicidae)

    Science.gov (United States)

    Neonicotinoid insecticides are commonly used in managing pest ants, including the imported fire ant, Solenopsis invicta Buren. There is increasing evidence that neonicotinoid insecticides at sublethal concentrations have profound effects on social insects. However, the sublethal effect of neonicot...

  18. Las estrategias de afrontamiento que utilizan los adolescentes ante situaciones que provocan miedo/ Coping strategies assumed by teenagers in situations that cause fear

    Directory of Open Access Journals (Sweden)

    Verónica Reyes Pérez

    2017-06-01

    Full Text Available objetivo: Identificar las estrategias de afrontamiento que usan los adolescentes mexicanos ante situaciones que provocan miedo. Método: El tipo de estudio fue no experimental. Los partici- pantes fueron 400 adolescentes mexicanos de nivel secundaria (50 % hombres y 50 % mujeres, Media de edad = 13.90 (DE= 0.96. Un instrumento midió la intensidad del miedo ante nueve tipos de situaciones: violencia social, animales, estar solo, médicos, situaciones sociales, lo desco- nocido, violencia doméstica, escuela y muerte (α = .93. Por medio de preguntas abiertas se pre- guntó a los participantes qué harían ante cada una de las situaciones, lo que permitió identificar el tipo de afrontamiento. Resultados: Las mujeres informaron mayor miedo que los hombres en todas las situaciones, excepto en miedo a la escuela, donde ellas tuvieron mayor puntaje. El patrón general fue que las mujeres usan más estrategias de desahogo emocional y búsqueda de apoyo, mientras que los hombres usan estrategias directas al problema, agresivas y de distracción. En particular, ante el miedo a la muerte, los hombres usan estrategias evitativas, distracción y búsqueda de apoyo, mientras que las mujeres usan estrategias directas al problema, desahogo emocional, búsqueda de apoyo, evitativas, distracción y agresivas. Ante el miedo a lo desconocido, los varones usan estrategias de distracción, agresivas y directas al problema, mientras que las muje- res usan desahogo emocional, directo al problema y agresivas. Las estrategias de afrontamiento no son buenas ni malas, su conveniencia depende del apoyo que brindan para resolver la situación que genera miedo.

  19. Aplicación del aborto terapéutico en Costa Rica: una perspectiva desde los derechos humanos y la salud de las mujeres

    OpenAIRE

    Rojas Calderón, Erika

    2014-01-01

    Para Faúndes (2005), tradicionalmente se le ha llamado aborto a la interrupción de un embarazo cuando éste se produce antes de las 22 semanas de gestación, o antes de que el feto alcance los 500 gramos de peso, luego de ello, la interrupción del embarazo es llamada “parto prematuro”. El aborto es una palabra polémica que suscita profundas emociones en casi todas las personas, sin importar cuál sea el nivel de relación que se tiene con el tema de los derechos humanos, los derechos reproduc...

  20. Hacia una ubicación conceptual de Internet como medio de comunicación

    Directory of Open Access Journals (Sweden)

    Gabriel Pérez Salazar

    2013-01-01

    Full Text Available El campo académico de la comunicación sigue enfrentando una serie de retos en lo relativo a su desarrollo disciplinar. Desde una perspecti- va epistemológica, la construcción de su objeto de estudio ha presentado algunos pendientes conceptuales, que permitirían plantear una re- exión más sólida en cuanto a la consideración de nuevas tecnologías que posibilitan actos co- municativos, dentro del conjunto de los media . El presente artículo tiene el objetivo de brindar elementos que contribuyen al fortalecimiento de esta categoría, ante la consolidación de Internet como innovación que ofrece posibilidades de interacción comunicativa nunca antes presentes en medio alguno, tanto por la compresión espa- cio-temporal que supone, como por las estructura rizomáticas a través de las cuales uye la informa- ción. Se argumentará que Internet es un medio de comunicación con posibilidades expresivas y de difusión, en buena medida, a partir de los usos sociales que se hacen del sustento hipertextual que posibilita la operación de uno de sus entornos más frecuentemente utilizados con intenciones comu- nicativas: la World Wide Web .