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Sample records for ante una pandemia

  1. Wolbachia, una pandemia con posibilidades

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    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. MÉXICO ANTE LA PANDEMIA DE INFLUENZA DE 1918: ENCUENTROS Y DESENCUENTROS EN TORNO A UNA POLÍTICA SANITARIA

    OpenAIRE

    Miguel Ángel Cuenya

    2014-01-01

    El arribo de la pandemia de influenza a México en 1918 ocasionó una gran crisis. Las autoridades nacionales y estatales se vieron superadas por la virulencia de la enfermedad. Se tomaron diversas acciones preventivas (cuarentenas, consignación a los enfermos en hospitales destinados especialmente para tal fin, limpieza de la vía pública, etc.). Pero, más allá de estas medidas que se habían aplicado en otras crisis sanitarias anteriores, no se plantearon nuevas alternativas. Por su parte, las ...

  3. MÉXICO ANTE LA PANDEMIA DE INFLUENZA DE 1918: ENCUENTROS Y DESENCUENTROS EN TORNO A UNA POLÍTICA SANITARIA

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    Miguel Ángel Cuenya

    2014-12-01

    Full Text Available El arribo de la pandemia de influenza a México en 1918 ocasionó una gran crisis. Las autoridades nacionales y estatales se vieron superadas por la virulencia de la enfermedad. Se tomaron diversas acciones preventivas (cuarentenas, consignación a los enfermos en hospitales destinados especialmente para tal fin, limpieza de la vía pública, etc.. Pero, más allá de estas medidas que se habían aplicado en otras crisis sanitarias anteriores, no se plantearon nuevas alternativas. Por su parte, las autoridades estatales si bien trataron de ejecutar las medidas indicadas desde la ciudad de México, problemas económicos, políticos y sociales, ocasionaron conflictos, encuentros y desencuentros,  entre autoridades locales, por un lado, y la sociedad civil, por otro, relacionados con la política sanitaria. 

  4. 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.

  5. Actualización sobre la gripe del virus A: experiencia de una pandemia desde la perspectiva enfermera

    OpenAIRE

    2010-01-01

    En abril de 2009 la Organización Mundial de la Salud (OMS) emite su primer comunicado, donde advierte la presencia de un brote epidémico por un nuevo virus de gripe A (H1N1) en EE.UU y México, declarando una Emergencia de Salud Pública de importancia internacional. Dos meses después la OMS elevó la alerta por este virus a nivel 6, el máximo de la escala que configura una pandemia, tras comprobar la transmisión elevada y sostenida del virus en el mundo. Actualmente, los Comités y Subcomités de...

  6. 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

  7. 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…

  8. Un nuevo virus A/H1N1, una nueva pandemia: Influenza un riesgo permanente para una humanidad globalizada

    OpenAIRE

    2014-01-01

    La influenza es una enfermedad altamente infectocontagiosa de la cual se tienen registros históricos descriptivos desde la época griega y de certeza etiológica tan solo hace casi ocho décadas atras. Su agente causal es el virus del influenza de los que se conoce exiten tres grandes tipos: A B y C. El tipo A tiene la propiedad de circular por diversos reservorios biológicos, tales como el hombre, los cerdos y las aves, entre otros. Representa además una elevada variabilidad g...

  9. 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.

  10. Influenza A (H1N1)pdm 2009. Papel de la medicina intensiva durante la pandemia y post-pandemia

    OpenAIRE

    Pérez Carrasco, Marcos

    2015-01-01

    La pandemia por virus influenza A(H1N1)pdm09 se caracterizó por una afectación severa de la función respiratoria, por lo que numerosos pacientes requirieron ingreso en el Servicio de Medicina Intensiva (SMI) para su mantenimiento y soporte. Las terapias utilizadas incluyen los sistemas de oxigenación, diferentes modalidades ventilatorias no invasivas e invasivas. Lamentablemente, las modalidades invasivas se han relacionado con una evolución desfavorable, tanto por la mayor gravedad del pacie...

  11. 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.

  12. 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.

  13. 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

  14. 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.

  15. Christine de Pizan: ¿una feminista ante litteram?

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    Elena Laurenzi

    2009-01-01

    Full Text Available En diálogo con la bibliografía crítica existente sobre Christine de Pizan y mediante una lectura atenta de La cité des dames, este artículo aboga por la consideración de esta autora como precursora feminista, subrayando el valor político de la querelle des femmes, la incipiente teoría feminista contenida en La cité des dames y la actualidad de muchos de sus elementos, como la conciencia del carácter construido del género o la concepción de lo femenino como proyección masculina.

  16. Validación de una escala de actitudes ante el cambio organizacional

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    ELAINE RABELO NEIVA

    2004-01-01

    Full Text Available Las actitudes de los individuos frente a los cambios organizacionales son consideradas como las grandes responsables de la resistencia ante el cambio y estas resistencias, a su vez, responsables, de los fracasos de estos procesos. Este estudio tiene como objetivo construir y validar una escala de actitudes frente al cambio organizacional, para lo cual se investigan las actitudes ante el cambio en la organización de 409 trabajadores de dos organizaciones brasileñas. Se han realizado análisis factoriales exploratorios para toda la muestra y para cada una de las dos empresas que han participado en el estudio. Se ha completado, además, un análisis factorial confirmatorio con el uso del modelado por ecuaciones estructurales y sus resultados muestran una adecuada validez del instrumento. Los resultados fueron similares en las dos organizaciones y evidencian actitudes de aceptación y de temor al cambio organizacional con intensidad similar. En menor grado, aparecen actitudes de cinismo con relación al cambio. En los análisis de cluster, se observan patrones de actitudes conflictivas y consistentes ante el cambio, lo que genera una discusión sobre su función en los procesos de cambio.

  17. DESARROLLO DE UNA PELÍCULA POLIMÉRICA CON PROPIEDADES ANTIEMPAÑANTES

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    Luis Alejandro Gutiérrez

    2011-08-01

    Full Text Available En la búsqueda de una película poliméricacon óptimas propiedades antiempañantesse seleccionó como matriz polimérica polietilenode baja densidad (LDPE, a lacual se incorporaron por extrusión uno delos siguientes aditivos: polisorbato 80,oleato de sorbitán, monooleato de gliceroly mezcla de glicéridos, cada uno a 3concentraciones. Para evaluar la eficienciaantiempañante de los empaques serealizaron medidas de tensión superficial,ángulos de contacto, medidas de transmisiónde luz y pruebas cualitativas de empañamientoen frío. Los resultados sugierenque la película con mejores propiedadesantiempañantes es la que contieneoleato de sorbitán al 1%.

  18. H1N1: pandemia e perspectiva atual

    OpenAIRE

    2011-01-01

    O vírus influenza de origem suína, A/California/04/2009 (H1N1), foi inicialmente detectado no México e determinou a pandemia de influenza de 2009. Em agosto de 2010, a Organização Mundial da Saúde (OMS) declarou o início da fase pós-pandêmica. As características dessa última pandemia foram marcadamente diferentes das anteriores. O vírus emergiu de rearranjos genéticos originários em hospedeiro mamífero não humano, demonstrou transmissibilidade interespécies e afetou a população humana de form...

  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(H1N1)2009 pandemia

    OpenAIRE

    2010-01-01

    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, transcriptas...

  20. Consideraciones sobre la organización de los servicios hospitalarios ante una epidemia de Influenza A (H1N1. Experiencia en Cienfuegos 2009

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    Grupo operativo provincial de atención médica a los enfermos adultos hospitalizados

    2011-04-01

    hospitalarios para el enfrentamiento de una epidemia de Influenza A (H1N1, afección de transmisión respiratoria constituye un reto y el éxito logrado dependerá, en gran medida, de los cambios organizativos desplegados desde la etapa de planificación y constituyen parte indispensable de la estrategia de trabajo. Objetivo: Describir las principales experiencias organizativas que fueron desarrolladas en el Hospital General Universitario Dr. Gustavo Aldereguía Lima de Cienfuegos, durante la etapa de pandemia de influenza A (H1N1 el año 2009. Método: Estudio prospectivo. Investigación en sistemas y servicios de salud, donde se hizo una amplia revisión bibliográfica, que se combina con técnicas de grupo (para la definición progresiva de la estrategia organizativa y se enmarcan las experiencias contenidas en la “carpeta de decisiones” creada al efecto. Resultados: Se reconocen los diferentes cambios realizados, modificación a los flujos habituales y conceptos en la atención médica, incluida la extensión y expansión de los servicios y sus camas de dotación. Se consideró oportuno la reducción de la actividad quirúrgica electiva, el trabajar por brigadas, la materialización de consultas diferenciadas en los servicios de urgencia, la definición de un área para atención a pacientes graves, el manejo diferenciado de las pacientes embarazadas, puérperas y neonatos, la capacitación continuada y el aseguramiento médico a la protección del personal, el aislamiento de los casos, la alimentación y esterilización. Conclusiones: La reorganización de la asistencia médica, los recursos humanos, la capacitaron continuada, el apoyo logístico, la optimización de los recursos, dirección y el trabajo colectivo son puntos claves en la organización para el enfrentamiento exitoso ante una epidemia.

  1. 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

  2. RESPUESTA DE LOS ACADÉMICOS DE UNA UNIDAD CIENTÍFICA ANTE EL CAMBIO DE PARADIGMA EDUCACIONAL EN UNA UNIVERSIDAD CHILENA DEL CONSEJO DE RECTORES

    OpenAIRE

    Brieba Rodríguez,CLaudio

    2006-01-01

    Entre los años 2001 y 2004, se realizó, a través de metodología inductiva y por medio de encuestas tipo panel, un estudio de tipo descriptivo, interpretativo y comprobatorio que permitiese entender la dinámica de la respuesta de los académicos de una unidad científica ante el cambio de paradigma educacional (del conductismo al constructivismo). Se presentan los resultados que indican que el cambio no fue tan estresante como se esperaba, aunque por ser la mayoría de los Académicos profesionale...

  3. Desarrollo de una película polimérica con propiedades antiempañantes

    OpenAIRE

    Luis Alejandro Gutiérrez; Sugey Martínez; Cesar Sierra

    2011-01-01

    En la búsqueda de una película poliméricacon óptimas propiedades antiempañantesse seleccionó como matriz polimérica polietilenode baja densidad (LDPE), a lacual se incorporaron por extrusión uno delos siguientes aditivos: polisorbato 80,oleato de sorbitán, monooleato de gliceroly mezcla de glicéridos, cada uno a 3concentraciones. Para evaluar la eficienciaantiempañante de los empaques serealizaron medidas de tensión superficial,ángulos de contacto, medidas de transmisiónde luz y pruebas cuali...

  4. 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.

  5. Tolerancia y hospitalidad. Una reflexión moral ante la inmigración

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    Thiebaut, Carlos

    2010-08-01

    Full Text Available Tolerance and hospitality are analysed as two dimensions in which the acceptance of difference operates in a political society (the first one, internal to it, the second one, external. Both are suggested to stem from, and to reinforce, experiences of reflective self-strangeness that lie in the heart of modernity. This article forwards an analysis of the internal logic –demands and restrictions– of these two dimensions and some ways in which their demands –at the epistemic, normative and political levels– intertwine in an era of globalization.

    La tolerancia y la hospitalidad son analizadas como dos formas de aceptación de las diferencias (la primera interna, la segunda externa en una sociedad política y se analizan como resultado y como productoras de una experiencia reflexiva de autoextrañeza que, se sugiere, está en el corazón normativo de la modernidad. El artículo presenta un análisis de las lógicas –demandas y restricciones– de esas dos dimensiones y se presentan las maneras en que las demandas –epistémicas, normativas, políticas– de ambas dimensiones se cruzan en tiempos de globalización.

  6. La fiscalidad de las cooperativas ante el nuevo Impuesto sobre Sociedades. Propuestas para una reforma

    Directory of Open Access Journals (Sweden)

    Marta Montero Simó

    2016-12-01

    Full Text Available La Ley 27/2014, del Impuesto sobre Sociedades ha introducido medidas como la reducción del tipo de gravamen general, la modificación del porcentaje de participación del socio en la sociedad para determinar el perímetro de vinculación, las reducciones por destinar resultados a fondo de capitalización o a fondo de nivelación, entre otras, que demandan una adaptación del régimen fiscal de las cooperativas al nuevo Impuesto sobre Sociedades. A lo que se unen las reformas operadas en las leyes cooperativas desde 1990. En el presente artículo se realiza una revisión de los mencionados cambios y se proponen posibles reformas al régimen fiscal vigente, atendiendo a su contenido esencial, el relativo al Impuesto sobre Sociedades.Recibido: 31.05.2016Aceptado: 05.09.2016

  7. Protocolo quirúrgico ante una cirugía de estrabismo

    OpenAIRE

    Llorente Rojo, Gema

    2014-01-01

    El estrabismo junto con los problemas de refracción son las patologías que más se presentan en la infancia. Alrededor de un 5% de los niños en edad preescolar y escolar presentan algún tipo. Es más frecuente que aparezca entre los dos y los cuatro años de edad. Dicho problema si no se trata puede llegar a causar una importante invalidez visual y psicológica. Por eso desde el punto de vista de la actuación de enfermería veo de vital importancia que se conozca tanto los objetivos de esta cir...

  8. Liderazgos colectivos y compartidos: antídoto para una sociedad dependiente de patrones y jefes.

    Directory of Open Access Journals (Sweden)

    René Mendoza

    2014-08-01

    Full Text Available La relación patrón-cliente (patrón-mozo, jefe-subordinado ha persistido detrás de las grandes obras, sea la construcción de una catedral, mina de oro, la organización de un ejército, la estructura de la Iglesia Católica Romana, o de las haciendas. Con el boom de las organizaciones se habla más de jefes–subordinados, directores–técnicos y presidentes–socios, la que puede llamarse una relación social líder–seguidor. Ese enfoque (el histórico de patrón-cliente y el de líder-seguidor fue creado en un tiempo en que se dependía de la fuerza física humana y donde la habilidad del líder (patrón o jefe se creía necesaria. En este artículo se argumenta que el principal obstáculo al desarrollo rural está en la persistencia del ‘matrimonio’ de ambas relaciones, el de patrón–cliente y el de líder–seguidor, en un contexto en que crecientemente dependemos más del trabajo cognitivo (conocimiento que del trabajo físico humano. En correspondencia, y en coherencia con la frase de Einstein arriba citada, proponemos un enfoque de liderazgos colectivos y compartidos donde las personas –de las organizaciones, de las comunidades y de las cadenas– liberen sus energías y se hagan líderes visionarios en cada área de la vida, contribuyendo a que cualquier forma de organización social sea más efectiva y llena de vida.

  9. Determinació del contingut d’almagat en un antiàcid mitjançant una volumetria complexomètrica

    OpenAIRE

    Tarancón Sanz, Alex; Barrón Bueno, Dolores; Viñas Rodríguez, David

    2015-01-01

    Aquest document descriu tres procediments analítics per dur a terme la determinació del contingut d’almagat en un preparat farmacèutic mitjançant una volumetria complexomètrica. Els procediments estan adaptats pel seu ús a l’assignatura “Laboratori Bàsic de Química Analítica” del Grau de Ciències Químiques de la Universitat de Barcelona.

  10. Equilibrios sobre el hielo: una breve (pero completa) revisión del conocimiento sobre el impacto humano en la Antártida

    OpenAIRE

    2011-01-01

    La Antártida es una de las zonas de nuestro planeta menos alteradas. Aún así, está sometida a una serie de impactos provocados por la presencia del hombre que son revisados brevemente en este artículo. Para cada tipo de alteración se citan los casos de estudio más representativos, las principales medidas de minimización y/o mitigación adoptadas, así como las contribuciones específicas realizadas recientemente por científicos de España, en caso de existir. Tras presentar la base de conocimient...

  11. Los principios del sistema liberal de medios ante la crisis de la comunicación pública. Una aproximación crítica

    OpenAIRE

    Martín-Algarra, M. (Manuel); Rodríguez-Polo, X. R. (Xosé Ramón)

    2011-01-01

    Ante el panorama actual de abandono de la función política de los medios y la situación crítica que se cierne sobre el periodismo, consideramos necesaria una reflexión acerca de los primigenios principios normativos sobre los que los medios se desarrollaron vinculándose al progreso de la democracia. En este trabajo realizamos una aproximación a los principios clásicos que alentaron el modelo liberal de los medios. Atendiendo al cambio de mentalidad, a las ideas que sobre l...

  12. El muestreo de áreas: una alternativa para estimar características poblacionales ante la ausencia de datos censales.

    Directory of Open Access Journals (Sweden)

    Edwin Chaves Esquivel

    2016-03-01

    Full Text Available Este artículo discute el uso del muestreo de áreas en la obtención de estimaciones de características poblacionales de una determinada región. Para ello se utilizan los segmentos censales del último censo de población y vivienda. La técnica fue aplicada en el cantón de San Rafael de Heredia y los resultados demuestran que el método es una buena alternativa, para la estimación de ciertas características poblacionales ante la carencia de datos censales.

  13. Equilibrios sobre el hielo: una breve (pero completa revisión del conocimiento sobre el impacto humano en la Antártida

    Directory of Open Access Journals (Sweden)

    P. Tejedo

    2011-01-01

    Full Text Available La Antártida es una de las zonas de nuestro planeta menos alteradas. Aún así, está sometida a una serie de impactos provocados por la presencia del hombre que son revisados brevemente en este artículo. Para cada tipo de alteración se citan los casos de estudio más representativos, las principales medidas de minimización y/o mitigación adoptadas, así como las contribuciones específicas realizadas recientemente por científicos de España, en caso de existir. Tras presentar la base de conocimiento existente en la actualidad respecto a los impactos humanos antárticos, el texto se cierra con una serie de recomendaciones dirigidas a mejorar el seguimiento de los mismos. Estas directrices deberán guiar los programas de investigación implementados en los próximos años para rentabilizar al máximo los recursos empleados y reforzar la protección de este emblemático lugar.

  14. Importancia de los Customer Relationship Management (CRM sanitarios en las pandemias y alertas sanitarias

    Directory of Open Access Journals (Sweden)

    Juan José Cubillas

    2015-05-01

    Conclusiones: Salud Responde atendió a 56.497 pacientes, de los cuales 48.287 no requirieron atención sanitaria. Aparte del posible ahorro económico que esto pudo suponer, contribuyó a minimizar la pandemia, evitando que pacientes con sintomatología leve fueran a su centro de salud para recibir atención médica o información, y evitó en gran medida el desbordamiento de las urgencias.

  15. 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.

  16. Rescatando el Salto de San Antón. Una historia reciente de construcción institucional

    OpenAIRE

    Raúl García Barrios; Valdemar Díaz Hinojosa; Lorena Cortés Vázquez; Guadalupe Torres Godínez; José Salazar Guzmán; Fernando Jaramillo Monroy; Rodrigo Morales Vázquez; Gabriela Miranda García; José Luis Alquiciras Solís; Carmen Tora Wiltshire Henríquez; David Pineda Fernández; Medardo Tapia Uribe; Gabriela Torres Gómez; César Añorve Millán; JuanManuel Zaragoza Contreras

    2007-01-01

    This paper develops a chronicle of the arise and evolution of a communitarian and intersectional coordination web that for over five years has been looking forward to halt and revert the environmental degradation in San Antón, a urban community located at the shore of the Apatlaco river, one of the main watercourses in Cuernavaca, Morelos, which bears high pollution levels.The paper presents the communitarian development of an autonomous process of management and regulation, related to the lo...

  17. Conocimientos sobre salud bucodental y evaluación de higiene oral antes y después de una intervención educativa en niños de 9-10 años

    OpenAIRE

    Bosch Robaina, R.; Rubio Alonso, Margarita; García Hoyos, Felisa

    2012-01-01

    La salud bucodental infantil es un objetivo de primer orden en el contexto de las políticas de salud pública. El objetivo de este estudio es analizar los conocimientos sobre salud bucodental y nivel de higiene oral antes y después de una intervención educativa. Se incluyeron en el estudio 50 niños de 9-10 años de edad. Los escolares realizaron una encuesta sobre conocimientos acerca de la salud bucodental antes y después de la intervención educativa que consistió en tres charlas participativa...

  18. 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”.

  19. 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.

  20. El rol terapéutico ante la personalidad del paciente: desde una perspectiva analítico-funcional

    OpenAIRE

    Ruiz Jurado, Laura

    2013-01-01

    Tras una revisión bibliográfica y del panorama actual psicológico, se analiza el posible rol del terapeuta atendiendo a los rasgos de la personalidad del paciente y profundizando especialmente en las características de los trastornos de la personalidad desde las directrices de la FAP. Després d'una revisió bibliogràfica i del panorama actual psicològic, s'analitza el possible paper del terapeuta atenent als trets de la personalitat del pacient i aprofundint especialment en les característi...

  1. Diseño de intervención ante una de las problemáticas asociadas al Absentismo Escolar: la falta de motivación escolar

    OpenAIRE

    Armesto Arias, Marta

    2014-01-01

    Diseño de intervención con tres colectivos (padres y madres, alumnos y alumnas y profesorado), ante una de las problemáticas asociadas al Absentismo Escolar en la ciudad de Gijón como es la falta de motivación escolar.

  2. Desarrollo y evaluacion psicometrica de una forma abreviada de la escala de posicionamiento ante el diagnostico enfermero

    Directory of Open Access Journals (Sweden)

    Jose Manuel Romero-Sanchez

    2013-06-01

    Full Text Available El Position on Nursing Diagnosis (PND es una escala que utiliza la técnica del diferencial semántico para medir las actitudes hacia el concepto diagnóstico enfermero. El estudio objetivó desarrollar una forma abreviada de la versión española de esta escala, evaluar sus propiedades psicométricas y eficiencia. Se utilizó un doble enfoque empírico-teórico para obtener una forma reducida del PND, el PND-7-SV, que fuera equivalente a la original. Mediante un diseño transversal a través de encuesta, se evaluó la fiabilidad (consistencia interna y fiabilidad test-retest, validez de constructo (análisis factorial exploratorio, técnica de grupos conocidos y validez discriminante y de criterio (validez concurrente, sensibilidad al cambio y eficiencia del PND-7-SV en una muestra de 476 estudiantes de enfermería españoles. Los resultados avalaron la utilidad del PND-7-SV para medir las actitudes hacia el diagnóstico enfermero de manera equivalente a la forma completa de la escala y en un tiempo más reducido.

  3. Honey Ants.

    Science.gov (United States)

    Conway, John R.

    1984-01-01

    Provides background information on honey ants. These ants are found in dry or desert regions of North America, Africa, and Australia. Also provides a list of activities using local species of ants. (JN)

  4. El esperado regreso de Perséfone, una nueva primavera ante el cambio climático

    OpenAIRE

    López,Mónica

    2014-01-01

    En i-3 se dedica un reportaje a la primavera. Se explica el mito de Perséfone, para introducir la entrevista realizada a la Directora del Departamento de Meteorología de TVE Mónica López. Formulándose una pregunta: ¿puede el cambio climático poner en peligro las estaciones y la vida tal como la conocemos?

  5. Catalina de Bedia: una fembra ante la justicia criminal. El individuo y su colectividad en una villa cantábrica a fines del siglo XV (Bilbao

    Directory of Open Access Journals (Sweden)

    Eduardo Muñoz Saavedra

    2016-08-01

    Full Text Available Este artículo tiene como objetivo analizar, desde diversas perspectivas, la presencia de una mujer en la documentación criminal regia castellana a fines del siglo XV. Así se atiende y reflexiona en torno a diversos elementos que explican la relación entre Catalina de Bedia, una mujer de la villa de Bilbao identificada como criminal, y los diversos espacios y niveles de socialización en el cual ella se inserta. De este modo, en primer lugar, se analizan las fuerzas históricas que confluyen para la existencia de la documentación criminal real; por otra parte, se reconstruye el accionar criminal de Catalina, considerando su movimiento, el sentido del espacio, la asociación delictiva y el accionar de los tribunales. Todo ello con el fin de acercarnos, no sólo al ámbito del crimen femenino, sino a la cotidianidad de la vida villana y sus dinámicas, estructuras y puntos de inflexión local y global.

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

    Directory of Open Access Journals (Sweden)

    M.E. Ghidella

    2007-12-01

    Full Text Available 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. Desafortunadamente, la tectónica del mar de Weddell es difícil de resolver debido a la escasez de datos y a su inherente complejidad. Aunque se ha alcanzado un progreso muy grande el los últimos 20 años, con nuevos datos aeromagnéticos marinos y mapas de gravedad derivada de altimetría satelital, todavía hay varios modelos en consideración que difieren en edades corticales y esquemas de apertura. En este trabajo se presenta una revisión de cuatro de esos modelos. Utilizando polos de rotación, isócronas sintéticas y líneas de flujo, se ha procedido hacia atrás en el tiempo comenzando en la anomalía magnética 34 (83,5 millones de años, porque la misma está relativamente bien definida en los océanos, y se presentan mapas de edades de corteza que muestran la trayectoria estimada del punto triple Sudamérica - Antártida - África para cada modelo. Asimismo se muestran gráficos de las reconstrucciones en cuatro épocas elegidas para todos los modelos usando la misma proyección y escala para facilitar la comparación. La variedad de suposiciones simplificadoras que debieron hacerse en cada modelo, recurriendo a fragmentación de placas para considerar las numerosas cuencas de syn-rift y períodos de extensión, son fuertes indicadores de que la tectónica de placas rígidas es un modelo demasiado simple para el presente problema.

  7. H1N1: pandemia e perspectiva atual H1N1: overview and perspectives

    Directory of Open Access Journals (Sweden)

    Nancy Bellei

    2011-12-01

    Full Text Available O vírus influenza de origem suína, A/California/04/2009 (H1N1, foi inicialmente detectado no México e determinou a pandemia de influenza de 2009. Em agosto de 2010, a Organização Mundial da Saúde (OMS declarou o início da fase pós-pandêmica. As características dessa última pandemia foram marcadamente diferentes das anteriores. O vírus emergiu de rearranjos genéticos originários em hospedeiro mamífero não humano, demonstrou transmissibilidade interespécies e afetou a população humana de forma diferente dos vírus pandêmicos anteriores (1918, 1957 e 1968 com maior morbidade e mortalidade em crianças e adultos jovens. Atualmente, o vírus apresenta padrão sazonal da mesma forma que o influenza A H3N2 e o influenza B, mantendo, até o momento, o mesmo perfil de patogenicidade, espectro clínico e sensibilidade a antivirais. A cepa foi incluída na vacina sazonal trivalente anual recomendada, principalmente para proteção dos grupos de risco mais vulneráveis a complicações pelas diferentes cepas de influenza.The swine origin influenza virus A/CALIFORNIA/04/2009 (H1N1 was first detected in Mexico and determined the 2009 influenza pandemic. In August 2010, World Health Organization (WHO declared the beginning of the post-pandemic period. This last pandemic was distinctly different from previous ones. The virus emerged from genetic rearrangement in non-human mammalian host. Moreover, its inter-species transmission is fully reported. However, it affected human population differently from previous pandemic viruses (1918, 1957, 1968, with increased morbidity and mortality among children and young adults. Currently, the virus has a seasonal pattern in the same way as influenza A H3N2 and influenza B, maintaining the same pathogenicity profile, clinical spectrum and sensitivity to antiviral agents. The strain was included in the annual trivalent seasonal vaccine formulation, mainly for risk groups, which are more vulnerable to

  8. Nuestra Señora de Tiermes (Montejo de Tiermes, Soria. De una ermita que antes fue monasterio y parroquia

    Directory of Open Access Journals (Sweden)

    Murillo, José Ignacio

    2014-12-01

    Full Text Available The Chapel of Nuestra Señora of Tiermes (Soria, placed on archaeological Roman site, has attracted the attention of those researchers interested in the site, on one hand, and of those devoted to the Romanesque architecture in the province, on the other. It is therefore that the chapel appears currently in a huge quantity of publications, proposing these different hypotheses regarding its origins. Some researchers defend the reuse of Roman or Visigothic materials in the apse of the church, while others think that this cannot be dated earlier than to the Romanesque period. With the aim of confirming or correcting these hypotheses, the main results of the archaeological analysis of the building are here exposed, comparing them with those conclusions coming from previous works.La ermita de Nuestra Señora de Tiermes (Soria, situada sobre el yacimiento romano, ha atraído, por un lado, el interés de aquellos dedicados al yacimiento, y por otro, de la investigación orientada a los problemas de la arquitectura románica de la provincia. Esto ha conllevado que en la actualidad la ermita cuente con una abultada nómina de publicaciones donde se enfrentan diferentes propuestas acerca de su origen. Para unos, es evidente el empleo de fábricas romanas o visigodas en la cabecera del templo y, para otros, su génesis no es anterior al periodo románico. En cualquier caso, sus fábricas originarias han sido la base de una dilatada secuencia de transformaciones. Con el objetivo de confirmar o corregir estas hipótesis, ofrecemos los resultados de la lectura de paramentos del edificio, enfrentándolos con las conclusiones de las investigaciones precedentes.

  9. 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 Resumen. 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.   Abstract. This article is an attempt to analyze the creation of new curricular proposals as a product of the convergence of institutional and personal micro processes as well as social macro processes, which are know in sociological theory as synthetic developments. This article starts on the idea that the creation of solid curricular products departs from previous historical processes, wich are then systematized and interpreted by the social actors involved, usually since opposite academic sceneries. In order to illustrate these processes, the author makes use of the construction of the Master’s Degree Program in Pedagogy of Diversity in Educational Processes  Basic Education Division of the Investigation and Teaching  Center of Education in the National University of Costa Rica.  emphasizing the impact that social changes have on academic discussions as well as its influence on the curricular design and career development.

  10. Un antes y un después del tiempo latinoamericano : la escritura testimonial de Josefina Ludmer en Aquí América Latina- Una especulación (2010)

    OpenAIRE

    2015-01-01

    La presente investigación de Maestría en Culturas y Literaturas Comparadas tiene como objetivo central analizar y comparar las principales características y funciones del tiempo en la literatura latinoamericana, según lo postulado cuanto lo implicado –a modo de un antes y un después, desde la perspectiva de una literatura posautónoma- por Josefina Ludmer, en su libro Aquí América Latina- Una especulación (2010). El libro mencionado será examinado en perspectiva testimonial considerando toda l...

  11. A influenza invisível: a resposta comunitária à pandemia de 1918-1920 no norte rural da Suécia

    OpenAIRE

    Engberg, Elisabeth

    2009-01-01

    Ao longo da história humana, pandemias recorrentes de influenza têm afetado indivíduos e sociedades em todo o mundo. No entanto, as respostas sociais têm variado no tempo e no espaço. Este artigo discute a resposta da sociedade à influenza espanhola de 1918-1920 no norte rural da Suécia, focando as medidas tomadas pelas comunidades locais para fazer frente à pandemia que avançava. Nas cinco comunidades rurais estudadas, a resposta oficial foi esparsa e reativa, e a presença da influenza pandê...

  12. 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

  13. 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.

  14. Estudio y simulación en régimen estático de una máquina de inducción ante huecos de tensión mediante una aplicación en Matlab

    OpenAIRE

    2012-01-01

    El objetivo de este trabajo es el de, principalmente, modelar una máquina asíncrona mediante la creación de una interface en Matlab (GUI). Con la cual podemos definir la actuación de un motor de inducción de manera estática. Y de la misma forma, servirá para estudiar su comportamiento ante huecos de tensión. Según la norma IEC 60034.2.1, se ha sido descrito el procedimiento para la obtención del circuito equivalente de una máquina de inducción de una manera práctica. Debido a los huecos de te...

  15. Lectina en L. Setiferus una alternativa en cultivo ante Enfermedades que Afectan al Cultivo de Camarones (Lectins from L. setiferus a possible solution for Culture Shrimp Diseases

    Directory of Open Access Journals (Sweden)

    Juan Alpuche

    2005-12-01

    Full Text Available El cultivo de camarones peneidos, es una actividad que genera ganancias del orden de billones de dólares en países como Ecuador, Brasil, China, y Tailandia. La mayor parte de la producción de estos países, se basan en el cultivo de Litopenaeus monodon. En América latina, Litopenaeus vannamei es la especie cultivada mas importante. Durante la rápida expansión de la camaronicultura, ha estado plagada por enfermedades, convirtiéndose en el problema más grande de la industria, causando perdidas millonarias en la industria; La mayoría de las enfermedades se hicieron evidentes en la última década del siglo pasado, en donde la mayoría de dichas enfermedades fueron causadas por virus que afectan a los camarones peneidos. El camarón blanco del Golfo de México aparenta ser una especie muy resistente a enfermedades virales, es por ello, que L. setiferus es considerada como una especie potencial para el desarrollo de esta actividad; estudios enfocados a conocer como funcionan los mecanismos de defensa en esta especie, son de vital importancia para el desarrollo planeado de la producción y el cultivo de la especie. La investigación del sistema inmune en la especie ha demostrado que es posible aumentar la resistencia a enfermedades, mediante la ingestión sustancias que modulen al sistema inmune y mediante programas que involucran prácticas básicas de buen manejo. El diagnostico de la enfermedad es difícil de realizar, si no se presentan síntomas o signos,. Para esto, se sugiere, que pueden usarse biomarcadores, mediante los cuales se puede monitorear el estado de salud de los organismos. Las lectinas son glicoproteínas de reconocimiento de carbohidratos, que se encuentran en la hemolinfa de crustáceos, considerando las características bioquímicas de las lectinas descubiertas, las hacen candidatas a ser usadas como marcardores de salud. Se pueden observar similitudes en cuanto a especificidad de lectinas encontradas a lo largo de

  16. Struggling Ants

    Institute of Scientific and Technical Information of China (English)

    2009-01-01

    Some of China’s college graduates are barely scraping by The village of Tangjialing, 20 km north of down town Beijing, was thrust into the public consciousness in November. Publishers that month released a book titled Ants

  17. La importancia de una nueva actitud por parte de los profesionales sanitarios ante la prevención del dolor en los neonatos

    OpenAIRE

    Carmena Hernández, Ana Isabel; Vidal Salcedo, Ana; Cobos Carvajal, María José

    2015-01-01

    Cartel presentado en la Segunda Conferencia Internacional de Comunicación en Salud, celebrada el 23 de octubre de 2015 en la Universidad Carlos III de Madrid Introducción: los recién nacidos presentan una inmadurez neurológica que será aumentada a menor edad gestacional, ello le crea mayor susceptibilidad de presentar una sensación dolorosa aumentada, pudiéndoles generar una serie de repercusiones a corto y largo plazo. El dolor en el campo de la pediatría se ha tratado como si fuera inexi...

  18. Conocimientos, actitudes y prácticas antes y después de una propuesta de Educación alimentaria y nutricional con herramientas TIC

    OpenAIRE

    Carzon, María Florencia

    2015-01-01

    La educación alimentaria y nutricional tiene un valor indiscutible en la prevención y promoción de la salud, contribuyendo a una alimentación saludable. Particularmente, es una herramienta fundamental de enseñanza y aprendizaje para la población con discapacidad visual. Estos individuos se encuentran en una situación vulnerable a padecer malnutrición en la infancia, por lo que con la ayuda de éste instrumento de la Educación para la Salud es posible reducir los efectos negativo...

  19. Beyond ANT

    DEFF Research Database (Denmark)

    Jansen, Till

    2016-01-01

    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....

  20. 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.

  1. La trágica ruptura con la vida: Experiencia de una sobreviviente ante el suicidio The tragic breakind with life: Experience of a survivor facing with the suicide

    Directory of Open Access Journals (Sweden)

    María Dolores Martínez López

    2009-12-01

    Full Text Available A través del relato biográfico proyectamos una reelaboración del campo de tensiones que se desarrollaron en el entorno de Francisco antes de cometer el suicidio. En un intento de explicar la concatenación de los hechos dentro de su trayectoria vital se observa una decadencia lineal de su salud a lo largo de los meses, truncada por una tentativa de suicidio, y con el desenlace efectivo del propósito autodestructivo. En consecuencia presentamos el duelo de la sobreviviente, que nos relata unos intensos sentimientos de pérdida y culpabilidad en su escenario diario, el cual muestra como un tormento sin esperanza.Through out the biographical statement we describe the tensions production that were developed in Francisco's environment before committing the suicide. In an attempt of explaining the succession of events within his vital path, a linear health decline is observed throughout the months, truncated by an attempt of suicide, and with the effective outcome of the self-destructive intention. Therefore we describe the sorrow of the survivor, which reports some intense loss and guilt feelings during her daily scene, showing a torture without hope.

  2. Ant Farm

    OpenAIRE

    2012-01-01

    Publié à l’occasion de l’exposition d’Ant Farm au Frac Centre du 12 au 23 décembre 2007, ce très beau catalogue, qui fait état des dix ans de création du collectif californien, propose un nombre important de documents iconographiques, de notices et de textes concernant leurs différents projets. Fondé en 1968 par Doug Michels et Chip Lord, rejoints par la suite par Curtis Schreier, Hudson Marquez, Douglas Hurr et d’autres encore, le collectif Ant Farm a marqué les esprits par quelques œuvres s...

  3. Disseny i implementació d'una eina de diagnòstic OBD-II mitjançant un conversor de CAN a Bluetooth

    OpenAIRE

    Llimós Muntal, Albert

    2014-01-01

    Aquest projecte de final de grau consisteix en l’elaboració d’una aplicació que permet la captació i interpretació de dades provinents d’un vehicle. Per tal de reproduir el comportament d’un vehicle s’ha usat un simulador anomenat Can Bus Ecu Simulator, una placa capaç de simular la informació que transmetria un vehicle real. L’objectiu principal era desenvolupar una aplicació el màxim de còmode i intuïtiva per a l’usuari que permetés conèixer el valor de certs paràmetres del s...

  4. Reflexión ética ante una situación de Conflicto en la cirugía del anciano.

    Directory of Open Access Journals (Sweden)

    Lázaro Acosta Marrero

    2008-10-01

    Full Text Available En la sociedad actual las dificultades propias en la cirugía del anciano, y a su vez los éxitos de la cirugía geriátrica, han establecido en los pacientes tres circunstancias: por un lado, indicación quirúrgica y buen pronóstico a priori; por otro, alto riesgo y contraindicación a la intervención, y por último, necesidad de tratamiento quirúrgico para la supervivencia, pero con resultados que pueden ser desalentadores. En este tercer grupo surge la siguiente pregunta: ¿qué es lo éticamente aceptable?, a la que pueden darse dos posibles respuestas: ofrecer una intervención en situación límite o no intervenir al paciente y cuidarlo, ayudándole a morir bien. Resolver este conflicto de forma ética es muy difícil, ya que no hay muchos estudios sobre qué actitud es la correcta ni, a veces, consenso entre profesionales. Se suele dar, además, en casos de cirugía de emergencia que obligan a una respuesta rápida, con una valoración precaria del enfermo, lo que dificulta el diálogo con el paciente y sus familiares. En este artículo se lleva a cabo una reflexión sobre los datos generales que orientan al cirujano a una praxis quirúrgica basada en el análisis de los principios éticos, y el fundamento de una evidencia clínica para la toma de decisiones. Se concluye con la pretensión de establecer medidas para mejorar los resultados y la calidad de la asistencia en esta situación planteada.

  5. Una aproximación a la vulnerabilidad y la resiliencia ante eventos hidrometeorológicos extremos en México

    Directory of Open Access Journals (Sweden)

    Roberto M. Constantino T.

    2011-01-01

    Full Text Available El objetivo de este artículo es la exploración de una forma institucional diferente para aproximarse al diseño de estrategias dirigidas a la atención de los eventos hidrometeorológicos que se presentan con frecuencia en México. En el contexto de una creciente presencia de este tipo de eventos en el país asociados con el cambio climático, el aumento en la resiliencia se relaciona con la identificación y corrección de la vulnerabilidad de aquellos ámbitos susceptibles a las amenazas de este tipo.

  6. Respuesta ecofisiológica del fitoplancton ante la variabilidad ambiental en una Bahía subtropical de Baja California Sur, México

    OpenAIRE

    Verdugo Díaz, Gerardo

    2004-01-01

    Se presentan los resultados de la interacción entre las variables físicas y químicas registradas en la zona eufótica de la Bahía de La Paz. B.C.S., y la respuesta ecofisiológica de la comunidad fitoplanctónica durante el ciclo anual junio del 2000 a junio del 2001. De acuerdo a las variables hidrológicas la zona se caracteriza por presentar un periodo cálido de junio a septiembre con temperaturas superficiales generalmente mayores a 23°C; una capa de mezcla reducida y una termoclina poco p...

  7. La singular locura del perdón ante lo imperdonable: una respuesta al girasol del Simón Wiesenthal

    OpenAIRE

    Villamizar Caycedo, María Mercedes

    2009-01-01

    El perdón, como un deber moral, una práctica y una creencia, es parte de la milenaria tradición judeo-cristiana, pero desde hace poco tiempo, especialmente, desde la segunda guerra mundial y con el surgimiento del derecho internacional humanitario y el concepto de “crimen de lesa humanidad”, el perdón se ha convertido en un tema de interés a nivel mundial, que va más allá del ámbito religioso. Distintos personajes del mundo político han pedido perdón por sucesos pasados, incluso por cosas que...

  8. 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

    OpenAIRE

    Juan Carlos Cataño Correa

    2009-01-01

    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;...

  9. 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.

  10. 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

  11. La inoculación del estrés: una técnica adecuada para aumentar la seguridad de los profesores debutantes ante situaciones potencialmente conflictivas

    Directory of Open Access Journals (Sweden)

    Jose Manuel ESTEVE ZARAZAGA

    2009-11-01

    Full Text Available Dada la aparición de un declive en el relutamiento y de un aumento de las presiones para incluir cambios en el curriculum y en el gobierno de las escuelas, será particularmente difícil durante la próxima década mantener la moral y la compentecia de los cuerpos de profesores. Muchos profesores pueden encontrarse sometidos a una doble fuente de estrés.

  12. 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.

     

  13. 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

  14. Identificación con los personajes y disfrute ante largometrajes de ficción. Una investigación empírica

    OpenAIRE

    Igartua, J.J. (Juan José); Múñiz, C. (Carlos)

    2008-01-01

    La investigación sobre entretenimiento mediático ha teorizado que uno de los principales factores explicativos del disfrute de los formatos narrativos es la identificación con los personajes. Sin embargo es escasa la investigación empírica al respecto. Se presentan los resultados de una investigación cuantitativa en la que se entrevistó a 300 sujetos, a la salida de las salas de cine en las que se exhibían los largometrajes Mar adentro, El lobo y Bridget Jones: sobreviviré. Los resultados ind...

  15. Perfil político y comportamiento electoral análisis de una muestra de votantes costarricenses ante las elecciones presidenciales de 1986

    OpenAIRE

    Jensen, Henning; González, Ramón

    2012-01-01

    Se estudio el comportamiento político-electoral del costarricense, mediante una encuesta, (n = 563) en el Área Metropolitana durante enero de 1986. El propósito fue estudiar la relación entre las preferencias electorales y los factores: características socio demográficas, comportamiento informativo, creencias electorales, perfil político de campaña e influencia de medios de persuasión. Se encontró que los electores de partidos mayoritarios basan sus preferencias en factores de carácter...

  16. 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.

  17. The Ants Have It!

    Science.gov (United States)

    Daugherty, Belinda

    2001-01-01

    Uses the GEMS guide, "Ants at Home Underground", to explore the life of ants and teach about them in a classroom setting. The activity applies students' knowledge of ants and students learn about ant colonies, what ants eat, and how they live. (SAH)

  18. El cólera: una enfermedad infecciosa reemergente. El candidato vacunal cv 638, una herramienta para su prevención

    OpenAIRE

    Adrian Zelada-Valdés; Talena Yamilé Ledón-Pérez; Rafael Alfredo Fando-Calzada

    2015-01-01

    Este artículo tiene como objetivo realizar una revisión de la enfermedad del cólera y del candidato vacunal CV 638 . El cólera es una en fermedad infecciosa reemergente , caracterizada por diarreas profusas, con apariencia de agua de arroz, causada por la ingestión de alimentos o agua s contaminada s con la bacteria Vibrio cholerae de los serogrupos O1 y O139. El serogrupo O1 es el causante de la séptima pandemia. La incidencia de diversos factores como ...

  19. Procesos de admisión integrales ante la necesidad de una nueva generación de médicos

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    Reneé Pereyra-Elías

    2011-02-01

    Full Text Available Sr Editor: Alrededor del mundo, las escuelas de medicina reciben todos los años gran cantidad de solicitudes de postulantes (1, y la oferta de vacantes no suele satisfacer la demanda. Es por esta razón que los procesos de admisión cumplen una función muy importante en la selección de quienes deberían ser los indicados para convertirse en futuros médicos. El Dr. Donald Barr se pronunció en la revista The Lancet acerca de este tema (2, manifestando que muchas veces estos procesos están centrados en el conocimiento en ciencias básicas que manejan los aspirantes, lo que, sin embargo, no funcionaría como la mejor forma de predecir la excelencia en la práctica médica...

  20. Las corrientes interpretativas de la comunicación educativa ante la sociedad del conocimiento. una perspectiva sociocrítica

    OpenAIRE

    Herrán Gascón, Agustín de la; Gleyvis CORO MONTANET

    2011-01-01

    El concepto de comunicación educativa ha sacudido la época contemporánea y ha sido condicionado por la explosión tecnológica. El presente artículo se propone contrastar críticamente las líneas de pensamiento generadas en torno al problema de los medios de comunicación de masas y las nuevas tecnologías de la información, cuya intelección parece determinada por la renovación tecnológica. Mediante una revisión de las fundamentales corrientes tradicionalistas y de la corriente representacional y ...

  1. Fire Ant Bites

    Science.gov (United States)

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

  2. Antes, durante y después de la visita de la "Dama Española": mortalidad por gripa en Boyacá, Colombia, 1912-1927 Antes, durante e depois da visita da "Dama Espanhola": a mortalidade por gripe em Boyacá, Colômbia, 1912-1927 Before, during and after the visit of the "Spanish Lady": mortality by influenza in Boyacá, Colombia, 1912-1927

    Directory of Open Access Journals (Sweden)

    Abel Fernando Martínez Martín

    2009-12-01

    Full Text Available Describir el impacto de la mortalidad por gripa en el periodo 1912-1927 en 68 municipios de Boyacá, Colombia. Estudio descriptivo, histórico, con enfoque epidemiológico. Se estableció el volumen y estructura de la población y se determinaron tasas de mortalidad para las variables de tiempo, persona y lugar. La gripa estuvo presente antes de la pandemia, se acentuó en 1918 y se volvió endémica hasta 1927. La primera muerte de la pandemia en Colombia se registra en Cartagena. En octubre se registra en Bogotá de donde se extiende a Boyacá. Se identificó un comportamiento polinómico de la pandemia de octubre a diciembre de 1918. Encontramos diferencias significativas en el comportamiento de la pandemia de gripa en Boyacá en comparación con lo descrito en Europa y Norteamérica por la literatura especializada, especialmente lo relacionado con piso térmico, grupos de edad más afectados y ausencia de oleadas.Este artigo descreve o impacto da mortalidade causada pela gripe no período de 1912-1927 em 68 municípios de Boyacá, Colombia. Um estudo descritivo, histórico, com enfoque epidemiológico. Estabelecemos o volume e a estrutura da população e determinamos taxas de mortalidade para as variavéis temporais, pessoais e de lugar. A gripe esteve presente antes do aparecimentos da pandemia, que se agravou em 1918 e se tornou endémica até 1927. A primeira norte causada pela pandemia na Colombia foi registrada em Cartagena. Em outubro registram-se as primeiras em Bogotá de onde se espalham para Boyacá. Identifíca-se um comportamento polinómico da pandemia de outubro a dezembro de 1918. Encontramos diferenças significativas no comportamento da pandemia de gripe em Boyacá em comparação com o que era descrito na Europa e na América do Norte pela literatura especializada, especialmente nas questões relacionadas com a mortalidade relacionada com as altitudes, com as faixas etárias mais afetadas e com o aumento de casos nas zonas

  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. Actores sociales y gobernanza. Percepciones encontradas ante la instalación de una planta de celulosa sobre el río

    Directory of Open Access Journals (Sweden)

    François Graña

    2006-01-01

    Full Text Available Con este avance de investigación damos inicio a un estudio de actores sociales que se posicionan ante el proyecto de instalación de la fábrica de celulosa Botnia S.A. en Fray Bentos, Uruguay. El contexto teórico adoptado es la perspectiva de la gobernanza, que se interesa por la toma de decisiones colectivas, el entendimiento y la negociación entre todos los afectados por situaciones complejas. En esta primera exploración hemos entrevistado a dirigentes sindicales, investigadores universitarios, ambientalistas y científicos contratados para el estudio de impacto. Nuestro objeto de estudio es la argumentación de los actores, y el propósito del análisis la reconstrucción de sus lógicas de razonamiento, su coherencia interna y las tensiones que lo recorren. La técnica empleada combina el análisis de contenido (KRIPPENDORFF, 1990 con procedimientos de interpretación tomados de la metodología comprensiva (ALONSO, 1998; NAVARRO y DÍAZ, 1998. Nos servimos del concepto de “tipo ideal” (WEBER, 1944 en la elaboración de siete modelos perceptivos: uno de sindicalistas, tres de ambientalistas y tres de asesores técnicos. En nuestra hipótesis, la comprensión de la lógica de los actores aporta elementos para el entendimiento de éstos entre sí; en este sentido, el trabajo pretende contribuir tanto al conocimiento científico como a la propia acción social. Abstract This article presents a study of the position of the social actors faced with the installation of the paper mill factory Botnia S.A in Fray Bentos, Uruguay. The theoretical framework adopted in this work is the governance perspective that is concerned with collective decision making as well as with the understanding and the negotiation among those that are involved in complex situations. In the first stage, we interviewed some trade union leaders, university researchers, environmentalists and scientists hired for the study on impact. The objective of this research is to

  5. 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.

  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. Diseño de una guía basada en la teoría de las 5´s para el mejoramiento de la calidad del desempeño del personal que labora en el Gobierno Municipal de Antonio Ante.

    OpenAIRE

    Ruiz Sevilla, Héctor Patricio

    2012-01-01

    Diseñar una guía basada en la teoría de las 5´S para el mejoramiento de la calidad del desempeño del personal que labora en el Gobierno Municipal de Antonio Ante. El objetivo del presente trabajo investigativo es el diseño de una guía basada en la teoría de las 5´S para el mejoramiento de la calidad del desempeño del personal que labora en el Gobierno Municipal de Antonio Ante. La formulación del problema es: ¿Qué estrategias de control de la calidad se podrían aplicar en la administración...

  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

    2012-10-01

    Full Text Available Normal 0 21 false false false ES-CO X-NONE X-NONE MicrosoftInternetExplorer4 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. /* Style Definitions */ table.MsoNormalTable {mso-style-name:"Tabla normal"; mso-tstyle-rowband-size:0; mso-tstyle-colband-size:0; mso-style-noshow:yes; mso-style-priority:99; mso-style-qformat:yes; mso-style-parent:""; mso-padding-alt:0cm 5.4pt 0cm 5.4pt; mso-para-margin-top:0cm; mso-para-margin-right:0cm; mso-para-margin-bottom:10.0pt; mso-para-margin-left:0cm; line-height:115%; mso-pagination:widow-orphan; font-size:11.0pt; font-family:"Calibri","sans-serif"; mso-ascii-font-family:Calibri; mso-ascii-theme-font:minor-latin; mso-fareast-font-family:"Times New Roman"; mso-fareast-theme-font:minor-fareast; mso-hansi-font-family:Calibri; mso-hansi-theme-font:minor-latin; mso-bidi-font-family:"Times New Roman"; mso-bidi-theme-font:minor-bidi;}

  9. Actitudes psicológicas ante la muerte y el duelo: Una revisión conceptual Psychological attitudes toward death and bereavement: One conceptual review

    Directory of Open Access Journals (Sweden)

    F.J. Gala León

    2002-10-01

    Full Text Available Introducción: la muerte siempre ha sido objeto de profundas reflexiones filosóficas, religiosas y, actualmente, científicas; sin embargo en las sociedades postindustriales es difícil aceptar su mera idea, de modo que las actitudes hacia ella han sufrido una evolución desadaptativa, retrocediendo de la mano del "progreso" de las actitudes saludables del afrontamiento y la aceptación, a las prefóbicas del sinvivir por su temor y a las fóbicas de su negación. Cambios socioculturales: podemos diferenciar en Occidente dos momentos en la vivencia de la muerte: uno previo a su Institucionalización Hospitalaria, en el que es aceptada como parte natural de la existencia y otro, desde que el Hospital pasa a ser la Institución reservada para morir, traduciéndose en un cambio radical en la consciencia e información sobre la propia muerte. Actitudes del Personal Sanitario: estos cambios también han alcanzado al PS. generándole muchas veces actitudes distorsionadas tales como no querer nombrar a la muerte o a las patologías "que las atraen", no mirar cara a cara al enfermo terminal, incongruencias y disonancias entre la Comunicación Verbal y la No Verbal y aumento de la atención tecnológica en detrimento de la empático-afectiva, con el riesgo del encarnizamiento terapéutico, empeorándose las condiciones de la muerte. Conclusión: el Marco Sanitario precisa de componendas éticas y estéticas para afrontar integralmente el proceso de morir, dotándose de medios, conocimientos y actitudes adecuadas para atender las necesidades biopsicosociales del moribundo con el objetivo de morir con dignidad.Introduction: Death has always been the object of deep philosophical, religious, and currently scientific reflections; however in post-industrial societies it is difficult to accept the very idea of it, so that attitudes to death have undergone maladaptive evolution, drawing back in the name of "progress" from the healthy attitudes of confrontation

  10. Modelos de cinemática de placas para Antártida durante la ruptura de Gondwana: una revisión Plate kinematic models for Antactica during Gondwana break-up: A review

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    M.E. Ghidella

    2007-12-01

    Full Text Available 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. Desafortunadamente, la tectónica del mar de Weddell es difícil de resolver debido a la escasez de datos y a su inherente complejidad. Aunque se ha alcanzado un progreso muy grande el los últimos 20 años, con nuevos datos aeromagnéticos marinos y mapas de gravedad derivada de altimetría satelital, todavía hay varios modelos en consideración que difieren en edades corticales y esquemas de apertura. En este trabajo se presenta una revisión de cuatro de esos modelos. Utilizando polos de rotación, isócronas sintéticas y líneas de flujo, se ha procedido hacia atrás en el tiempo comenzando en la anomalía magnética 34 (83,5 millones de años, porque la misma está relativamente bien definida en los océanos, y se presentan mapas de edades de corteza que muestran la trayectoria estimada del punto triple Sudamérica - Antártida - África para cada modelo. Asimismo se muestran gráficos de las reconstrucciones en cuatro épocas elegidas para todos los modelos usando la misma proyección y escala para facilitar la comparación. La variedad de suposiciones simplificadoras que debieron hacerse en cada modelo, recurriendo a fragmentación de placas para considerar las numerosas cuencas de syn-rift y períodos de extensión, son fuertes indicadores de que la tectónica de placas rígidas es un modelo demasiado simple para el presente problema.The opening history of both the Weddell Sea and South Atlantic Ocean is critical to understand the break-up of

  11. Riding with the ants

    NARCIS (Netherlands)

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

    2017-01-01

    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 Xenope

  12. 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.

    2016-01-01

    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 Xenope

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

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    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.

  14. 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.

  15. The first mesozoic ants.

    Science.gov (United States)

    Wilson, E O; Carpenter, F M; Brown, W L

    1967-09-01

    Two worker ants preserved in amber of Upper Cretaceous age have been found in New Jersey. They are the first undisputed remains of social insects of Mesozoic age, extending the existence of social life in insects back to approximately 100 million years. They are also the earliest known fossils that can be assigned with certainty to aculeate Hymenoptera. The species, Sphecomyrma freyi, is considered to represent a new subfamily (Sphecomyrminae), more primitive than any previously known ant group. It forms a near-perfect link between certain nonsocial tiphiid wasps and the most primitive myrmecioid ants.

  16. Producción de los antígenos ESAT-6 y CFP-10 de Mycobacterium tuberculosis y evaluación de sus potencialidades en el serodiagnóstico de la tuberculosis activa en una población cubana

    Directory of Open Access Journals (Sweden)

    Elsa T. Pimienta-Rodríguez

    2012-01-01

    Full Text Available Mycobacterium tuberculosis (Mtb es el agente causal de la tuberculosis humana (TB, la cual es la enfermedad infecciosa de mayor prevalencia mundial causada por una bacteria. En el 2009 hubo un estimado de 9,4 millones de nuevos casos y se estima que un tercio de la población mundial está infectada con Mtb. Debido a esta situación, el diagnóstico temprano y eficaz de la TB es vital para controlar su expansión y mortalidad. En este trabajo se clonaron los genes esat-6 y cfp-10 del genoma de Mtb en los respectivos vectores plasmídicos pET3a y pET23d (Promega de Escherichia coli. Ambas proteínas fueron expresadas en la fracción soluble, lo cual facilitó su purificación mediante la cromatografía de afinidad por quelatos metálicos en condiciones nativas con una pureza entre 90 - 94 %. Por primera vez, empleando la metodología de ELISA, se evaluó el potencial diagnóstico de estas dos proteínas recombinantes en una población cubana. La respuesta de anticuerpos reactivos contra ESAT-6 y CFP-10 recombinantes en los sueros de los enfermos fue significativamente mayor que la de los individuos sanos vacunados con BCG. El ensayo presentó una especificidad del 97,18 %, pero tuvo una baja sensibilidad del 32 %; valor que puedo estar relacionado con el tratamiento de los pacientes con los medicamentos antituberculosos. Este parámetro pudiera incrementarse mediante la inclusión de otros antígenos inmunogénicos en la mezcla, considerando que la respuesta a anticuerpos en los pacientes de TB es heterogénea.

  17. 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)

  18. 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...

  19. Sick ants become unsociable.

    Science.gov (United States)

    Bos, N; Lefèvre, T; Jensen, A B; d'Ettorre, P

    2012-02-01

    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 provide evidence for the evolution of unsociability following pathogen infection in a social animal and suggest an important role of inclusive fitness in driving such evolution.

  20. 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...

  1. 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

  2. Nova metodologia d'aprenentatge autònom aplicada a una pràctica d'Enginyeria Química mitjançant tècniques de recerca-acció

    OpenAIRE

    Cano, M.; Vega, F. (Francisco); S. Nilsson; Celia García Arenas; Vilches, L. F.; Leiva, C.

    2014-01-01

    Un grup de professors del Departament d'Enginyeria Química i Ambiental de l'Escola Tècnica Superior d'Enginyeria de la Universitat de Sevilla ha realitzat un treball d'investigació-acció amb l’objectiu de millorares resultats docents en l'assignatura Experimentació en Enginyeria Química. El procés d'investigació-acció ha consistit en dissenyar una metodologia alternativa per a una de les pràctiques de l'assignatura, incorporant un exercici d'auto-aprenentatge que substitueixi la tradicional m...

  3. Record dynamics in ants.

    Directory of Open Access Journals (Sweden)

    Thomas O Richardson

    Full Text Available The success of social animals (including ourselves can be attributed to efficiencies that arise from a division of labour. Many animal societies have a communal nest which certain individuals must leave to perform external tasks, for example foraging or patrolling. Staying at home to care for young or leaving to find food is one of the most fundamental divisions of labour. It is also often a choice between safety and danger. Here we explore the regulation of departures from ant nests. We consider the extreme situation in which no one returns and show experimentally that exiting decisions seem to be governed by fluctuating record signals and ant-ant interactions. A record signal is a new 'high water mark' in the history of a system. An ant exiting the nest only when the record signal reaches a level it has never perceived before could be a very effective mechanism to postpone, until the last possible moment, a potentially fatal decision. We also show that record dynamics may be involved in first exits by individually tagged ants even when their nest mates are allowed to re-enter the nest. So record dynamics may play a role in allocating individuals to tasks, both in emergencies and in everyday life. The dynamics of several complex but purely physical systems are also based on record signals but this is the first time they have been experimentally shown in a biological system.

  4. Nova metodologia d'aprenentatge autònom aplicada a una pràctica d'Enginyeria Química mitjançant tècniques de recerca-acció

    Directory of Open Access Journals (Sweden)

    M. Cano

    2014-12-01

    Full Text Available Un grup de professors del Departament d'Enginyeria Química i Ambiental de l'Escola Tècnica Superior d'Enginyeria de la Universitat de Sevilla ha realitzat un treball d'investigació-acció amb l’objectiu de millorares resultats docents en l'assignatura Experimentació en Enginyeria Química. El procés d'investigació-acció ha consistit en dissenyar una metodologia alternativa per a una de les pràctiques de l'assignatura, incorporant un exercici d'auto-aprenentatge que substitueixi la tradicional metodologia aplicada. L'objectiu de l'experiència docent pretén aconseguir una participació més activa de l'alumnat, millorant l'assimilació de conceptes i la capacitat per planejar el treball experimental. Els resultats obtinguts amb la nova metodologia, comparats amb els del mètode tradicional de l'experiència, indiquen que, encara que els alumnes tendeixen a adoptar una actitud passiva i són reticents a augmentar el grau de treball autònom, el nou procediment va ajudar a millorar l'aplicació dels conceptes teòrics en el disseny i la realització de la pràctica.

  5. Utilization of Anting-Anting (Acalypha indica) Leaves as Antibacterial

    Science.gov (United States)

    Batubara, Irmanida; Wahyuni, Wulan Tri; Firdaus, Imam

    2016-01-01

    Anting-anting (Acalypha indica) plants is a species of plant having catkin type of inflorescence. This research aims to utilize anting-anting as antibacterial toward Streptococcus mutans and degradation of biofilm on teeth. Anting-anting leaves were extracted by maceration technique using methanol, chloroform, and n-hexane. Antibacterial and biofilm degradation assays were performed using microdilution technique with 96 well. n-Hexane extracts of anting-anting leaves gave the best antibacterial potency with minimum inhibitory concentration and minimum bactericidal concentration value of 500 μg/mL and exhibited good biofilm degradation activity. Fraction of F3 obtained from fractionation of n-hexane's extract with column chromatography was a potential for degradation of biofilm with IC50 value of 56.82 μg/mL. Alkaloid was suggested as antibacterial and degradation of biofilm in the active fraction.

  6. Los factores de resiliencia ante las situaciones traumáticas. Análisis tras los atentados del 11 de marzo en una muestra de pacientes en el CSM de Alcalá de Henares.

    Directory of Open Access Journals (Sweden)

    Alberto Fernández Liria

    2010-01-01

    Full Text Available Introducción: Los atentados del 11M del 2004 en Madrid supusieron un reto para la sanidad madrileña, debido al gran número de afectados y víctimas. Esta demanda fue especialmente visible en el CSM de Alcalá de Henares, que tuvo que hacer frente a gran número de afectados. El objetivo del estudio es conocer a los dos años y medio de los atentados los factores que los pacientes consideran más les han ayudado a la superación de una situación traumática (de resiliencia. Material y Método: Se recogió la población de pacientes que acudieron al CSM con un motivo de consulta en relación a los atentados terroristas, mayores de edad con un periodo de inclusión de 3 meses y medio tras los atentados. La muestra final estaba conformada por 104 pacientes, se contactó entre los meses de febrero y marzo del 2007 telefónicamente para que respondiese a 5 cuestiones entre la que se encontraba la relativa a los factores de resiliencia. Las respuestas se transcribieron literalmente y posteriormente se elaboraron una serie de etiquetas o categorías que englobasen a todas las respuestas. Resultados: De los 104 pacientes se logro contactar con 78 y de ellos 76 accedieron a contestar. El factor de resiliencia más mencionado fue el asociado al entorno sociofamiliar, seguido del tratamiento y en tercer lugar la respuesta individual al trauma y las características propias del individuo, otros factores de resiliencia fueron mencionadas en menor medida. Conclusiones: Nuestros hallazgos resaltan la importancia de el entorno sociofamiliar como el factor de mayor utilidad para la readaptación tras una vivencia traumática, coincidiendo con la mayoría de los estudios. Destaca que las variables asociadas al tratamiento son mencionados solo por 10 pacientes de la muestra, lo que parece indicar una mayor importancia del apoyo social para la superación de una vivencia traumática y una menor utilidad para los pacientes de nuestra muestra del tratamiento

  7. El Diseño Curricular de la Educación de Personas Adultas ante el nuevo reto educativo. Un acercamiento didáctico desde una perspectiva tecnológica

    Directory of Open Access Journals (Sweden)

    Bienvenido MENA MERCHÁN

    2009-11-01

    Full Text Available RESUMEN: Las realidades educativas que se han ido sucediendo en el tiempo sólo son comprensibles si se examinan en el contexto histórico que se han producido. El estudio de la estructura del sistema educativo inmediato da una idea de su evolución y constata que la Educación en España ha estado en permanente debate. El crecimiento económico y la recomposición social a que éste dio lugar acentuaron las divergencias entre la nueva mentalidad social y las exigencias culturales que estos mismos cambios favorecían, de una parte, y el carácter autoritario de la organización política vigente, de otra, esa misma contradicción se mostró agudamente en el campo educativo, que asociaba una organización arcaica con una función preferente de control ideológico.ABSTRACT: The educative facts are only understandable if we examine their historical contexts. The study of the current educative system's structure gives us some information about its evolution, and confirms the fact that education in Spain has always been in constant debate. The economic growth and the social recomposition, as outcome of the first, accented the divergences between a new social mentality and the cultural requirements that these changes favoured, on the one hand, and the authoritarian character of the valid political organization, on the other. That contradiction was specially evident in a kind of education which combined an archaic organization with a basic function of ideological control.

  8. UTILIZACIÓN DE UNA NUEVA METODOLOGÍA PARA LA EVALUACIÓN DE ARROZ (Oryza sativa L. ANTE LA INFECCIÓN PRODUCIDA POR EL HONGO Pyricularia grisea

    Directory of Open Access Journals (Sweden)

    Regla M. Cárdenas

    2000-01-01

    Full Text Available Se evaluó la resistencia de varias líneas y varieda- des de arroz frente a la infección producida por el hongo Pyricularia grisea, agente causal de la enfermedad conocida como Piriculariosis de gran importancia a escala mundial. Se empleó una nueva metodología de campo utilizada por el Cen- tro Internacional de Agricultura Tropical (CIAT, la cual pro- pone realizar las evaluaciones en un sitio donde exista una alta diversidad genética del patógeno y una elevada presión del inóculo. El trabajo se desarrolló en la granja Caribe pertene- ciente al Complejo Agroindustrial Arrocero” Los Palacios” en Pinar del Río, donde la enfermedad es uno de los factores que limitan la producción. Los resultados mostraron un total de ocho líneas y variedades resistentes en la primera evaluación para el estado de plántula y siete en la segunda para ese mismo estado. Todos los materiales evaluados como resistentes en hoja para el estado de plántula resultaron ser susceptibles a la enfermedad en la panícula. No existió correlación entre las eva- luaciones realizadas en hojas y en la panícula.

  9. 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.

  10. Una propuesta metodológica para medir la vulnerabilidad de un territorio ante los peligros naturales: el caso de Honduras tras el paso del huracán Mitch

    Directory of Open Access Journals (Sweden)

    Ahamdanech Zarco, Ismael

    2004-06-01

    Full Text Available When some kind of humanitarian disaster happens, one question comes to our mind. Would it have been possible to avoid the disaster? Other questions also seem reasonable: would it have been possible lighten the consequences?, would the disaster have been so destructive in a developed zone? The vulnerability concept arises related to these questions, as an approach of a disaster effects on populations and territories with different characteristics. Along this work, we develop a methodology to measure the vulnerability concept. This methodology is applied to the Mitch hurricane in Honduras case.

    [es] Cuando sucede alguna catástrofe humanitaria de cualquier tipo siempre surge, o al menos debería hacerlo, una pregunta: ¿se podría haber evitado?, e inmediatamente aparecen otras, ¿en cualquier caso, se podrían haber atenuado sus consecuencias?, ¿habría causado los mismos daños en una zona desarrollada? Relacionado con estas preguntas aparece el concepto de vulnerabilidad, como una aproximación al efecto de una misma catástrofe sobre poblaciones y territorios con diferentes características. En este trabajo se desarrolla una metodología para medir dicho concepto de vulnerabilidad y se aplica al caso del huracán Mitch en Honduras. [fr] Quand un certain genre de désastre humanitaire se produit, une question vient à notre esprit. Il aurait été possible d'éviter le désastre? D'autres questions semblent également raisonnables : il aurait été possible éclairent les conséquences?, le désastre aurait été si destructif dans une zone développée? Le concept de vulnérabilité surgit connexe à ces questions, comme approche des effets d'un désastre sur des populations et des territoires avec différentes caractéristiques. Le long de ce travail, nous développons une méthodologie pour mesurer le concept de vulnérabilité. Cette méthodologie est appliquée à l'ouragan de Mitch dans le cas du Honduras.

  11. Conocimientos sobre salud bucodental y evaluación de higiene oral antes y después de una intervención educativa en niños de 9-10 años Oral health knowledge and tooth brushing quality before and after an educational intervention in children aged 9 and 10

    Directory of Open Access Journals (Sweden)

    R. Bosch Robaina

    2012-02-01

    Full Text Available Introducción: La salud bucodental infantil es un objetivo de primer orden en el contexto de las políticas de salud pública. El objetivo de este estudio es analizar los conocimientos sobre salud bucodental y nivel de higiene oral antes y después de una intervención educativa. Material y métodos: Se incluyeron en el estudio 50 niños de 9-10 años de edad. Los escolares realizaron una encuesta sobre conocimientos acerca de la salud bucodental antesy después de la intervención educativa que consistió en tres charlas participativas en grupos de 25 niños. Se evaluó el índice de placa de O'Leary antes y después de la intervención educativa. Resultados: En la encuesta realizada antes de la intervención el 78% contestaron que sabían en qué consiste la caries y cómo prevenirla. En cambio el 60% contestó que sólo había que acudir al dentista cuando hubiera algún problema bucal. Antes de la intervención educativa, el 80% de los niños tenían un índice de O'Leary superior al 20%. Se obtuvieron cambios significativos en cuanto a conocimientos de salud bucal así como en la calidad del cepillado después de la intervención educativa. Conclusiones: Los conocimientos de los niños sobre salud bucodental así como la calidad del cepillado dental mejoraron significativamente después de la intervención educativa.Introduction: Children's oral health is an essential target for public health policies. The aim of this study is to analyze the oral health knowledge and the quality of oral hygiene before and after an educational intervention. Material and Methods: Primary school fifty children aged 9 and 10 were included in the study. They conducted a survey on oral health before and after an intervention including three educational workshops. Oral hygiene O'Leary index was evaluated before and after the intervention. Results: In the survey conducted before the intervention, 78% said they knew what tooth decay was and how they could prevent it

  12. ANT i arbejdslivsforskningen

    DEFF Research Database (Denmark)

    2012-01-01

    for Tidsskrift for Arbejdsliv at stille skarpt på, hvorledes teknologi kan forstås og udforskes, og her står nyere teoridannelser som STS (Science- and Technology Studies) og ANT (Actor-Network Theory) centralt. Dette temanummer af tidsskriftet har derfor disse teorier og deres anvendelse i studier af arbejdsliv...

  13. Tiny, Powerful, Awesome Ants!

    Science.gov (United States)

    Tate, Kathleen

    2007-01-01

    Peering through a thematic science lens--elementary students embarked on a one-week study of ants during a month-long summer school program. This integrated unit addressed reading and writing skills while developing the science-process skills of observation, inferring, and communicating in a motivating and authentic way. Pre- and post-assessments…

  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. Asociación de Antígenos Leucocitarios humanos de clase II (HLA-II) con Esclerosis Sistémica Progresiva en una cohorte de pacientes colombianos

    OpenAIRE

    Jaramillo Arroyave, Daniel

    2014-01-01

    Introducción: La Esclerosis Sistémica (ES) es una enfermedad inflamatoria crónica de etiología desconocida caracterizada por fibrosis de piel y órganos internos, además de proliferación micro vascular y fenómenos de autoinmunidad. Su patogénesis sigue en estudio y se ha determinado la importancia que juega la parte genética en su desarrollo. El HLA de clase II ha resultado ser un parámetro importante desde el punto de vista de probabilidad de desarrollo de la enfermedad, perfil clínico y sero...

  16. 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.

  17. Urea in Weaver Ant Feces

    DEFF Research Database (Denmark)

    Vidkjaer, Nanna H.; Wollenweber, Bernd; Jensen, Karl-Martin V.;

    2016-01-01

    investigate the interactions of weaver ants with the host plants with respect to plant nutrition. Here, we report the identification and quantification of urea, a highly effective foliar nutrient present in the fecal depositions of O. smaragdina. Feces samples obtained from six O. smaragdina colonies were......Weaver ants are tropical insects that nest in tree canopies, and for centuries these ants have been used for pest control in tropical orchards. Trees hosting weaver ants might benefit not only from the pest protective properties of these insects but also an additional supply of nutrients from ant...

  18. "Ant-egg" cataract revisited

    DEFF Research Database (Denmark)

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

    2017-01-01

    PURPOSE: Hereditary congenital cataract varies immensely concerning location and form of the lens opacities. A specific and very rare phenotype is called "ant-egg" cataract first described in 1900. "Ant-eggs" have previously been examined using light microscopy, backscattered electron imaging and X......-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......-egg" structures in "ant-egg" cataract. Eighteen of these proteins are not natively found in the human lens. Moreover, "ant-eggs" do not vary over time, after cataract extraction, regarding size and location....

  19. "La relación cooperativa-municipio en el ordenamiento jurídico cubano. Una aproximación a su realidad y a sus perspectivas ante el proceso de perfeccionamiento del modelo económico en el país" (The cooperative-municipality relationship in the Cuban legal system. An approach to its reality and perspectives faced with the improvement process of the country's economic model

    Directory of Open Access Journals (Sweden)

    Orisel Hernández Aguilar

    2013-01-01

    Full Text Available El objetivo de este trabajo es aportar algunas valoraciones entorno a la actual situación de la relación cooperativa - municipio dentro de losmarcos normativos en los que se desarrolla la cooperativa en Cuba, así comosus potencialidades ante una regulación legal que instrumente una ampliaciónde dichas prácticas como parte de la reestructuración del modelo económicoprevisto en los Lineamientos aprobados por el VI Congreso del Partido Comunistade Cuba y que regirán durante los próximos años las transformacionesemprendidas por el país.

  20. Ante la ley

    Directory of Open Access Journals (Sweden)

    Kafka Franz

    1999-12-01

    Full Text Available Ante las puertas de la ley hay un guardian. Un campesino se llega hasta ese guardian y le pide que le permita entra en la ley, pero el guardian le dice que por ahora no se lo puede permitir. El hombre reflexiona y entonces pregunta si podria entrar despues. Es posible -dice el guardian-; pero no ahora. La puerta de entrada a la ley esta abierta como siempre.

  1. Hacia una publicidad solidaria

    OpenAIRE

    Barcala Calvo, Ignacio; Matilla, Concepción

    2000-01-01

    Podemos decir que actualmente los medios de comunicación ejercen una enorme influencia sobre nosotros. Los informativos definen lo que es la realidad para buena parte de la población y la publicidad marca hábitos de consumo y crea actitudes ante la vida. Esta reflexión pretende analizar críticamente el modelo educativo que nos ofrece la publicidad, encaminado hacia la rentabilidad, la utilidad y el éxito de la sociedad de mercado, como valores primordiales que debemos mantener y proponer, des...

  2. Distributed nestmate recognition in ants.

    Science.gov (United States)

    Esponda, Fernando; Gordon, Deborah M

    2015-05-07

    We propose a distributed model of nestmate recognition, analogous to the one used by the vertebrate immune system, in which colony response results from the diverse reactions of many ants. The model describes how individual behaviour produces colony response to non-nestmates. No single ant knows the odour identity of the colony. Instead, colony identity is defined collectively by all the ants in the colony. Each ant responds to the odour of other ants by reference to its own unique decision boundary, which is a result of its experience of encounters with other ants. Each ant thus recognizes a particular set of chemical profiles as being those of non-nestmates. This model predicts, as experimental results have shown, that the outcome of behavioural assays is likely to be variable, that it depends on the number of ants tested, that response to non-nestmates changes over time and that it changes in response to the experience of individual ants. A distributed system allows a colony to identify non-nestmates without requiring that all individuals have the same complete information and helps to facilitate the tracking of changes in cuticular hydrocarbon profiles, because only a subset of ants must respond to provide an adequate response.

  3. El parlamento de Juan II ante las cortes generales de Monzón (1469. Una pequeña crónica autobiográfica en lengua castellanoaragonesa

    Directory of Open Access Journals (Sweden)

    David Guixeras

    2016-12-01

    Full Text Available Edición crítica y estudio histórico, formal y lingüístico del discurso con el que Juan II de Aragón abrió, el 13 de noviembre de 1469, las cortes generales de Monzón. En plena guerra civil catalana, los rebeldes habían ofrecido la corona a Renato de Anjou, y la llegada desde Francia de su hijo, el duque de Lorena, con un poderoso ejército obligaba a pedir subsidios para afrontar la grave situación. En este parlamento, una de las escasas muestras de aragonés tardío conservadas, el monarca hizo un relato autobiográfico de su reinado de innegable sesgo maniqueo. This article contains the critical edition and study (history, form and language of John II of Aragon’s opening speech, which took place at the general court in Monzón on 13th November 1469. At the height of Catalan Civil War, the rebels had offered the crown to Renato of Anjou. However, his son’s arrival, the duke of Lorena, from France with a powerful army forced the king to ask for benefits in order to face up to the grave situation. In this discourse, one of the few remaining samples of the late Aragonese language, the king produced an autobiographical account of his reign with an undeniable manichaen guidance.

  4. 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...

  5. Antes del Diseño

    Directory of Open Access Journals (Sweden)

    Javier González Solas

    2014-01-01

    Full Text Available La práctica profesional del diseño está sometida a una dispersión que dificulta la reflexión sobre ella misma. Y la enseñanza universitaria se ha convertido en gran parte en una práctica más. De este modo la ausencia de una reflexión radical, anterior en el tiempo (revisión de la historia y anterior en el método (pensar antes de hacer, puede convertirse en un colaboracionismo amoral con todo tipo de catástrofe intelectual y sociopolítica. La perspectiva aquí adoptada proviene de una toma de posición, también previa, a lo que a veces se toma como científico. Frente a un estado de cosas difícil de cambiar, cabe asumirlo tal cual y reducirse a un papel instrumental (antipolítico, o reflexionar. Y ese sería el papel político de la Universidad.

  6. Unamuno y Francisco Antón Casaseca. Epistolario

    OpenAIRE

    Tellechea Idígoras, José Ignacio

    2001-01-01

    [ES] La edición de este epistolario tiene dos partes tras una introducción general. En la primera se recogen las cartas de Unamuno dirigiera a Antón Casaseca editadas por éste en 1962 con interesantes glosas personales. En la segunda cincuenta cartas de bella prosa del zamorano Francisco Antón muestran la admiración entusiasta de un joven por el maestro, al que conoció en Salamanca y acompañaba en sus visitas a Zamora. La mayoría son de los años 1905-1911, en que Antón contaba 25-30 años. ...

  7. Temperature: Human Regulating, Ants Conforming

    Science.gov (United States)

    Clopton, Joe R.

    2007-01-01

    Biological processes speed up as temperature rises. Procedures for demonstrating this with ants traveling on trails, and data gathered by students on the Argentine ant ("Linepithema humile") are presented. The concepts of temperature regulation and conformity are detailed with a focus on the processes rather than on terms that label the organisms.

  8. The metapleural gland of ants.

    Science.gov (United States)

    Yek, Sze Huei; Mueller, Ulrich G

    2011-11-01

    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 of the MG, sanitation and chemical defence, have received the strongest empirical support; two additional possible functions, recognition odour and territorial marking, are less well supported. The design of the MG is unusual for insects; glandular secretions are stored in a rigid, non-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 morphology, phylogenetic transitions and chemical ecology of the MGs of both the derived and the unstudied early-branching (basal) ant lineages is needed to elucidate the evolutionary origin and diversification of the MG of ants.

  9. 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

  10. Juan Manuel de Prada ante el papel

    Directory of Open Access Journals (Sweden)

    Antonio Preciado

    2008-12-01

    Full Text Available En la primavera de 1997, interesado en el joven autor de 26 años que había demostrado una madurez desconcertante, conseguí hacerle una entrevista para la Radio Universitaria de Salamanca, que, por una reforma radical en la emisora, nunca fue emitida. En octubre, de Prada obtuvo, a tan temprana edad, el Premio Planeta, convirtiéndose en lo que es ahora, un autor de primera fila en la literatura española, y un técnico de la emisora con sentido ético me llamó para entregarme la grabación. Me dirigí a la prensa para publicar la entrevista, juzgando que sería bien recibida, pero no obtuve respuesta. Por fin, después de tanto tiempo, he decidido dar a conocer aquella entrevista, que fue hecha en toda profundidad y que desvela ante nuestros ojos cómo son los comienzos de un autor joven y desconocido, que se ha convertido, por cierto, en el más controvertido ideológica y literariamente de la actualidad.

  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...

  12. ANT, tourism and situated globality

    DEFF Research Database (Denmark)

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

    2015-01-01

    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......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...... 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...

  13. Importancia del cepillado antes de acostarse en la prevención de la caries: Estudio en una población infantil The importance of night tooth brushing before sleeping in the prevention of dental caries: Study on childhood population

    Directory of Open Access Journals (Sweden)

    TE Ruiz Sedano

    2007-02-01

    Full Text Available En el presente trabajo nos planteamos si sería imprescindible el cepillado tres veces al día y, en caso contrario, en qué momento del día sería más importante la eliminación mecánica de la placa. Para ello, se planteó un estudio transversal correspondiente a 214 escolares de 6-12 años en el periodo comprendido en el curso 2004-5. A cada niño se le practicó el "Examen parcial o tipo III" recomendado por la Federación Dental Internacional, como procedimiento estándar para un estudio de prevalencia de caries. Hemos obtenido los siguientes resultados: 1. El cepillado de dientes antes de acostarse es un factor protector de la presencia de caries, siendo el correspondiente odd-ratio ajustado de 0.339 (intervalo de confianza al 95% [0.159; 0.722]. 2. El consumir azúcar más de una vez una vez al día tiene más riesgo de aparición de caries que si consumen una vez al día, siendo el correspondiente odd-ratio ajustado de 1.998 (intervalo de confianza al 95% [1.090; 3.665]. 3. Los niños que acuden a un colegio público tienen más riesgo de presentar caries que los que asisten a un colegio privado. Siendo el correspondiente odd-ratio ajustado de 2.019 (intervalo de confianza al 95% [1.105; 3.691]. 4. Se cumplen en la población estudiada los objetivos marcados sobre caries dental por la OMS para el año 2000.In the present study we are questioning if the [three time a day tooth brushing is really essential and if it is the [opposite case, what time of the day would be most important for mechanical elimination of dental plaque. For this purpose we have planed a transversal study on 214 pupils aged 6 to 12 years in the period [of 2004-05 scheduled school coarse. On each of them was applied the "Partial Exam type III" [which is recommended from International Dental Federation and which is considered as standard procedure on prevalence of dental caries study. We obtained following results: 1. Tooth brushing by night before sleeping is a

  14. 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

  15. 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.

  16. Importancia de Proteger una Marca.

    Directory of Open Access Journals (Sweden)

    Nerbys Hernández Dorta

    2008-07-01

    Full Text Available Las marcas están incluidas dentro de la rama de la Propiedad Industrial y no son más que palabras, símbolos, formas tridimensionales distintivas o figuras que se asocian a un producto o servicio para diferenciarlo y distinguirlo de los iguales o similares que se ofertan en el mercado. También reflejan una calidad constante que el consumidor espera del producto o servicio y constituyen un medio publicitario. El registro de la marca en Cuba se realiza ante la Oficina Cubana de la Propiedad Industrial radicada en la Ciudad de la Habana o ante los Puestos de Trabajo establecidos en cada provincia del país. El mismo le otorga al titular el derecho exclusivo a su uso de modo que nadie más puede usarla en el comercio sin su autorización en territorio cubano, y además protege a la empresa y le permite consolidar su actividad empresarial e imagen ante la clientela y el mercado. En este trabajo se expone una breve reseña de lo que son las marcas, se dan algunos consejos útiles para su confección, su modo de protección en Cuba, la legislación que la protege en el país y la importancia que tiene para las empresas cubanas inscribir sus marcas.

  17. Identifying potential evolutionary relationships within a facultative lycaenid-ant system: Ant association,oviposition, and butterfly-ant conflict

    Institute of Scientific and Technical Information of China (English)

    NEIL COLLIER

    2007-01-01

    Facultative associations are commonly encountered between ants and lycaenids,although the nature and patterns of associations are typically unclear. This study investigated a facultative symbiosis involving the lycaenid Theclinesthes albocincta (Lycaenidae), its host plant Adriana quadripartita and Australian native ants. Ants in the genera Ochetellus and Iridomyrmex were most frequently found in association with T. albocincta larvae,although Iridomyrmex ants were found in much lower abundance than were ants in Ochetellus. The abundances of Ochetellus and Iridomyrmex were highly correlated with larval abundance, but not egg abundance. Observations and experiments recorded oviposition on male inflorescences on more than 95% of occasions, but oviposition was not greater on inflorescences with ants present. Behavioral assays showed that Iridomyrmex ants were aggressive towards female butterflies on significantly more occasions than were Ochetellus ants. These findings indicate potential evolutionary relationships between T. albocincta and two genera of ants that were abundant within the habitat.

  18. Que yo las nubes resistir no puedo: las respuestas de Carolina Coronado y Luisa Pérez de Zambrana ante la polémica en torno al género en Gertrudis Gómez de Avellaneda (Una lectura transatlántica

    Directory of Open Access Journals (Sweden)

    Rodríguez Gutiérrez, Milena

    2014-12-01

    Full Text Available This paper offers an approach to the “gender polemic” in Gertrudis Gomez de Avellaneda from a transatlantic perspective. We simultaneously consider the main Spanish and Cuban critics involved in the controversy. But fundamentally we aim to hear how the two women writers in Spain and Cuba played a similar function: Carolina Coronado and Luisa Perez placed, in the two countries, in similar sites, as feminine opponents of Avellaneda, who was viewed as a male poet. Our study aims to look into various issues related to Coronado and Perez: what the two women authors had in common, their opinion of Avellaneda, and their responses to the controversy. The proposed hypothesis is that the comparative reading of the Coronado’s and Perez’s responses will contribute to deepening our understanding of this controversy.Este artículo propone un acercamiento a la llamada “polémica en torno al género” en Gertrudis Gómez de Avellaneda desde una perspectiva transatlántica. Se consideran, de modo simultáneo, los principales críticos españoles y cubanos que intervienen en este debate. Pero fundamentalmente se pretende escuchar a las dos escritoras que en España y en Cuba desempeñaron similar función, Carolina Coronado y Luisa Pérez; ubicadas, en los dos países, en sitios parecidos: como poetisas y contrincantes femeninas de Avellaneda, quien fue considerada poeta, en el sentido masculino del término. Nuestro trabajo propone indagar en diversas cuestiones relacionadas con Coronado y Pérez: qué había en común entre ambas autoras; cuál fue su juicio sobre Avellaneda; cuáles fueron sus respuestas ante la polémica. La hipótesis propuesta es que la lectura comparada de las respuestas de Coronado y Pérez contribuirá a enriquecer el conocimiento en torno a esta polémica.

  19. Monoculture of leafcutter ant gardens.

    Directory of Open Access Journals (Sweden)

    Ulrich G Mueller

    Full Text Available BACKGROUND: 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. METHODOLOGY/PRINCIPAL FINDINGS: 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. CONCLUSIONS/SIGNIFICANCE: 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.

  20. 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.

  1. Ants medicate to fight disease.

    Science.gov (United States)

    Bos, Nick; Sundström, Liselotte; Fuchs, Siiri; Freitak, Dalial

    2015-11-01

    Parasites are ubiquitous, and the ability to defend against these is of paramount importance. One way to fight diseases is self-medication, which occurs when an organism consumes biologically active compounds to clear, inhibit, or alleviate disease symptoms. Here, we show for the first time that ants selectively consume harmful substances (reactive oxygen species, ROS) upon exposure to a fungal pathogen, yet avoid these in the absence of infection. This increased intake of ROS, while harmful to healthy ants, leads to higher survival of exposed ants. The fact that ingestion of this substance carries a fitness cost in the absence of pathogens rules out compensatory diet choice as the mechanism, and provides evidence that social insects medicate themselves against fungal infection, using a substance that carries a fitness cost to uninfected individuals.

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

    DEFF Research Database (Denmark)

    Doerr, Benjamin; Neumann, Frank; Sudholt, Dirk;

    2011-01-01

    are investigated. The influence of the evaporation factor in the pheromone update mechanism and the robustness of this parameter w.r.t. the runtime behavior have been determined for the example function OneMax.This work puts forward the rigorous runtime analysis of the 1-ANT on the example functions Leading...

  3. Fatores de risco associados à gravidade e óbitos por influenza durante a Pandemia de Influenza A (H1N1 2009 em região tropical/semi-árida do Brasil

    Directory of Open Access Journals (Sweden)

    Daniele Rocha Queiroz Lemos

    2015-06-01

    Full Text Available Introdução: O vírus da Influenza A (H1N1 2009 pdm tornou-se uma cepa sazonal da gripe a partir de 2010. Provoca doença leve na maioria dos pacientes e pequena proporção dos acometidos evolui para a forma grave da doença, necessitando de tratamento hospitalar e cuidados intensivos. Durante a pandemia de Influenza A (H1N1 2009, ainda não era conhecida a patogenicidade e virulência da nova cepa. Este fato ressalta a necessidade de estudos para determinar as características epidemiológicas, clínicas e indicadores de mortalidade, especialmente nas formas graves e óbitos. Objetivo: Identificar os fatores associados à ocorrência de gravidade e óbitos durante a pandemia de Influenza A (H1N1 2009 pdm no Ceará. Metodologia: Trata-se de uma coorte observacional, retrospectiva, dos pacientes admitidos em hospitais da capital do Ceará e detectados por meio dos casos notificados no Sistema de Informação de Agravos de Notificação (SINAN, no período pandêmico 2009-2010. Foram trabalhados os casos com diagnóstico de infecção aguda por vírus A (H1N1 por RT-PCR. Após identificado o paciente, buscou-se na unidade de hospitalização o prontuário de acompanhamento médico. Utilizou-se como instrumento para coleta de dados a APACHE II e questionário contendo dados da hospitalização, exames clínicos e laboratoriais. Após Teste Qui-quadrado, foram considerados significativos P<0,05 e IC de 95%. Resultados: Foram confirmados 40 casos graves por influenza A (H1N1 2009 pdm, com 8 (20% óbitos. Em 2010, os pacientes graves apresentaram duas vezes mais chances de serem internados na UTI e o percentual de óbitos foi 50% maior que em 2009. A letalidade foi 2,4 vezes maior entre os homens. Os pacientes com ensino fundamental completo tinham uma vez mais chances de evoluir para óbito que os pós-graduados. O tempo médio entre a data dos primeiros sintomas e o início do tratamento com Fosfato de Oseltamivir foi de 4,13 dias entre os que

  4. Antígona, para siempre contemporánea

    OpenAIRE

    PATRICK GUYOMARD

    2005-01-01

    Interroga una vez más el comentario de Lacan sobre Antígona, desarrolla tres dimensiones de lo que constituye su propia lectura de la tragedia: el deseo y el goce, el problema de la transmisión y la cuestión del desafío, que el autor eleva a desafío radical, paradigma de la transgresión de la ley del Otro. Responde a la pregunta por el goce del cuerpo y de los cuerpos, por oposición a un goce fuera de la historia, que constituye el acto transgresivo de Antígona, que a la vez se sostiene como ...

  5. Ant opsins: sequences from the Saharan silver ant and the carpenter ant.

    Science.gov (United States)

    Popp, M P; Grisshammer, R; Hargrave, P A; Smith, W C

    1996-03-01

    cDNA clones encoding opsins from compound eyes of carpenter ant, Camponotus abdominalis, and Saharan silver ant, Cataglyphis bombycina, were isolated from cDNA libraries. The opsin cDNAs from each species code for deduced proteins with 378 amino acids which are 92% identical. Of the 30 amino acid differences between the two proteins, 13 are non-conservative. Eight of these non-conservative substitutions are within the membrane spanning domain. The presence of a potential Schiff-base counterion in helix III in both species suggests that these opsins are the protein moiety of the visible range pigments. When compared to all known opsins, these opsins are most similar to the opsin from preying mantis (76% identity at the amino acid level). Phyletic comparisons group the two ant opsins with the other arthropod long wavelength opsins.

  6. A cellular automata model for ant trails

    Indian Academy of Sciences (India)

    Sibel Gokce; Ozhan Kayacan

    2013-05-01

    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 (i) ant colony consists of two kinds of ants, goodand poor-smelling ants, (ii) ants might make U-turn for some special reasons. For some values of densities of good- and poor-smelling ants, the flux and mean velocity of the colony were studied as a function of density and evaporation rate of pheromone.

  7. 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.

  8. Optimal cue integration in ants.

    Science.gov (United States)

    Wystrach, Antoine; Mangan, Michael; Webb, Barbara

    2015-10-07

    In situations with redundant or competing sensory information, humans have been shown to perform cue integration, weighting different cues according to their certainty in a quantifiably optimal manner. Ants have been shown to merge the directional information available from their path integration (PI) and visual memory, but as yet it is not clear that they do so in a way that reflects the relative certainty of the cues. In this study, we manipulate the variance of the PI home vector by allowing ants (Cataglyphis velox) to run different distances and testing their directional choice when the PI vector direction is put in competition with visual memory. Ants show progressively stronger weighting of their PI direction as PI length increases. The weighting is quantitatively predicted by modelling the expected directional variance of home vectors of different lengths and assuming optimal cue integration. However, a subsequent experiment suggests ants may not actually compute an internal estimate of the PI certainty, but are using the PI home vector length as a proxy.

  9. Ant colony optimization in continuous problem

    Institute of Scientific and Technical Information of China (English)

    YU Ling; LIU Kang; LI Kaishi

    2007-01-01

    Based on the analysis of the basic ant colony optimization and optimum problem in a continuous space,an ant colony optimization (ACO) for continuous problem is constructed and discussed. The algorithm is efficient and beneficial to the study of the ant colony optimization in a continuous space.

  10. Using Ants to Investigate the Environment

    Science.gov (United States)

    Hagevik, Rita A.

    2005-01-01

    The best place for students to begin to understand complex environmental relationships is in their own back yards. Doing investigations of ants allows students to establish a baseline survey of ant fauna, test the importance of ants in nutrient cycling and soil structure maintenance, and increase their understanding of the environment and their…

  11. Pest repellent properties of ant pheromones

    DEFF Research Database (Denmark)

    Offenberg, Joachim

    2012-01-01

    ant species (iii) Azteca instabilis and (iv) Camponotus textor reduce herbivory by flea beetles (Margaridisa sp.), whereas (v) deposits from Solenopsis geminata, did not lead to reduced herbivory. Further evidence for the impact of ant pheromones comes from studies showing that non-herbivorous ant...

  12. El sistema del Tratado Antártico en sus bodas de oro

    Directory of Open Access Journals (Sweden)

    Roberto Puceiro Ripol

    2010-07-01

    Full Text Available Del pasado al presente ... y hacia el futuro. Una inédita maquinaria provocadora y desafiante. Las partes como protagonistas. Las reuniones consultivas del Tratado Antártico como eje del sistema. Propósitos y principios. Las forzosas nueva convenciones. Los órganos complementarios. Conclusiones

  13. The antipredatory behaviours of Neotropical ants towards army ant raids (Hymenoptera : Formicidae)

    OpenAIRE

    Dejean, A.; Corbara, B.; Roux, Olivier; Orivel, J.

    2014-01-01

    Group hunting, nomadism, wingless queens and colony fission characterize army ants, allowing them to have become the main tropical arthropod predators, mostly of other social insects. We studied the reactions of different ant species to the New World army ants Eciton burchellii (WESTWOOD, 1842) and E. hamatum (FABRICUS, 1782) (Ecitoninae). We compiled our results with those already known in a synthetic appendix. A wide range of ant species react to the approach of army ant raids by evacuating...

  14. 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

  15. 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....

  16. 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....

  17. Evolutional Ant Colony Method Using PSO

    Science.gov (United States)

    Morii, Nobuto; Aiyoshi, Eitarou

    The ant colony method is one of heuristic methods capable of solving the traveling salesman problem (TSP), in which a good tour is generated by the artificial ant's probabilistic behavior. However, the generated tour length depends on the parameter describing the ant's behavior, and the best parameters corresponding to the problem to be solved is unknown. In this technical note, the evolutional strategy is presented to find the best parameter of the ant colony by using Particle Swarm Optimization (PSO) in the parameter space. Numerical simulations for benchmarks demonstrate effectiveness of the evolutional ant colony method.

  18. 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...

  19. Team swimming in ant spermatozoa.

    Science.gov (United States)

    Pearcy, Morgan; Delescaille, Noémie; Lybaert, Pascale; Aron, Serge

    2014-06-01

    In species where females mate promiscuously, competition between ejaculates from different males to fertilize the ova is an important selective force shaping many aspects of male reproductive traits, such as sperm number, sperm length and sperm-sperm interactions. In eusocial Hymenoptera (bees, wasps and ants), males die shortly after mating and their reproductive success is ultimately limited by the amount of sperm stored in the queen's spermatheca. Multiple mating by queens is expected to impose intense selective pressure on males to optimize the transfer of sperm to the storage organ. Here, we report a remarkable case of cooperation between spermatozoa in the desert ant Cataglyphis savignyi. Males ejaculate bundles of 50-100 spermatozoa. Sperm bundles swim on average 51% faster than solitary sperm cells. Team swimming is expected to increase the amount of sperm stored in the queen spermatheca and, ultimately, enhance male posthumous fitness.

  20. Introduced fire ants can exclude native ants from critical mutualist-provided resources.

    Science.gov (United States)

    Wilder, Shawn M; Barnum, Thomas R; Holway, David A; Suarez, Andrew V; Eubanks, Micky D

    2013-05-01

    Animals frequently experience resource imbalances in nature. For ants, one resource that may be particularly valuable for both introduced and native species is high-carbohydrate honeydew from hemipteran mutualists. We conducted field and laboratory experiments: (1) to test if red imported fire ants (Solenopsis invicta) competed with native ants for access to mutualisms with aphids, and (2) to quantify the effects of aphid honeydew presence or absence on colony growth of native ants. We focused on native dolichoderine ants (Formicidae, Dolichoderinae) because they are abundant ants that have omnivorous diets that frequently include mutualist-provided carbohydrates. At two sites in the southeastern US, native dolichoderine ants were far less frequent, and fire ants more frequent, at carbohydrate baits than would be expected based on their frequency in pitfall traps. A field experiment confirmed that a native ant species, Dorymyrmex bureni, was only found tending aphids when populations of S. invicta were suppressed. In the laboratory, colonies of native dolichoderine ants with access to both honeydew and insect prey had twice as many workers and over twice as much brood compared to colonies fed only ad libitum insect prey. Our results provide the first experimental evidence that introduced ants compete for access to mutualist-provided carbohydrates with native ants and that these carbohydrates represent critical resources for both introduced and native ants. These results challenge traditional paradigms of arthropod and ant nutrition and contribute to growing evidence of the importance of nutrition in mediating ecological interactions.

  1. 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.

  2. La publicidad : una experiencia en el aula

    OpenAIRE

    Santacruz Laguna, Francisco Javier; Camacho Marín, Antonia

    2003-01-01

    El conocimiento de la publicidad debe ser una labor prioritaria de la escuela. Enseñar sus técnicas y métodos de persuasión, así como desarrollar la capacidad crítica del alumnado ante uno de los instrumentos más poderosos de la sociedad de consumo, es el objetivo fundamental de este taller de publicidad. Para ello es necesaria la adquisición de una competencia semiológica que pueda descifrar los mensajes icónicos verbales de los medios de comunicación de masas y de la publicidad. Para ello e...

  3. 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.

  4. Mindfulness, una herramienta útil en la salud escolar

    OpenAIRE

    Cañada Campos, María

    2015-01-01

    Una buena salud escolar se alcanza cuando se tienen en cuenta los siguientes aspectos: la alimentación equilibrada, el ejercicio adecuado y continuo, la seguridad y utilización correctas de las instalaciones, los estiramientos adecuados antes y después del ejercicio físico y el descanso diario de unas ocho horas, sobretodo en edades tempranas. Además de todos los aspectos comentados, el presente trabajo pretende aportar una reflexión y una práctica sobre la salud en el ámbito educativo, basad...

  5. Por que encaminhar ao acompanhante terapêutico? uma discussão considerando a perspectiva de psicólogos e psiquiatras ¿Por qué encaminar al acompañante terapéutico? una discusión considerando la perspectiva de psicólogos y psiquiatras Why leading patients to be assisted by a psychotherapist? - a discussion considering the perspectives of psychologists and psychiatrists

    Directory of Open Access Journals (Sweden)

    Igor Londero

    2006-08-01

    Full Text Available Esta pesquisa investigou quais os fatores que influenciam psiquiatras e psicólogos a indicarem o trabalho de Acompanhante Terapêutico (AT e qual seu papel no tratamento de pacientes. Participaram do estudo três psicólogos e três psiquiatras, que trabalham em clínicas multiprofissionais de Porto Alegre. Foi utilizada uma entrevista semi-estruturada, constituída de sete questões abertas que abordaram os temas relativos ao problema de pesquisa. Os dados obtidos foram submetidos à análise de conteúdo qualitativa, que permitiu a delimitação das seguintes categorias: 1 Fatores para indicação de AT; 2 Papel no tratamento; 3 Habilidades e características necessárias para atuar como AT; 4 referencial teórico e área de conhecimento mais adequada para a prática. O trabalho do acompanhante terapêutico é percebido como coadjuvante no tratamento, exercendo um papel ativo e, muitas vezes, de crucial importância para o sucesso deste, por atuar diretamente no ambiente em que o paciente está inserido.Este trabajo investigó qué factores influencian psiquiatras y psicólogos a indicar el trabajo de Acompañante Terapéutico (AT, y cual es su papel en el tratamiento de pacientes, según la percepción de estos profesionales. Participaron en el estudio tres psicólogos y tres psiquiatras que trabajan en clínicas multiprofesionales de Porto Alegre (RS. Fue utilizada una entrevista semiestructurada, constituida de siete cuestiones de respuesta libre que abordaron los temas relativos al problema de investigación. Los datos obtenidos por medio de la entrevista fueron sometidos al análisis de contenido cualitativo, que permitió la delimitación de las siguientes categorías: 1 factores para indicación de acompañante terapéutico; 2 papel del acompañante terapéutico en el tratamiento; 3 habilidades y características necesarias para el acompañante terapéutico; 4 referencial teórico y área de conocimiento más adecuada para la pr

  6. El cólera: una enfermedad infecciosa reemergente. El candidato vacunal cv 638, una herramienta para su prevención

    Directory of Open Access Journals (Sweden)

    Adrian Zelada-Valdés

    2015-01-01

    Full Text Available Este artículo tiene como objetivo realizar una revisión de la enfermedad del cólera y del candidato vacunal CV 638 . El cólera es una en fermedad infecciosa reemergente , caracterizada por diarreas profusas, con apariencia de agua de arroz, causada por la ingestión de alimentos o agua s contaminada s con la bacteria Vibrio cholerae de los serogrupos O1 y O139. El serogrupo O1 es el causante de la séptima pandemia. La incidencia de diversos factores como son los desastres naturales, sistemas sanitarios deficientes, la poca accesibilidad al agua potable, ha favorecido a que cada año se reporte n entre 3 y 5 millones de personas que sufren esta enfermedad, con una alta cif ra de defunciones . Además, en muchas regiones del planeta, el cólera se ha vuelto endémico, lo que ha provocado grandes pérdidas en la macro y microeconomía de los países afectados. Asimismo, se ha reportado un aumento de la resistencia a los agentes antim icrobian os usados tradi cionalmente para combatir la enf ermedad. Por tal razón, desde el año 2005 la Organización Mundial de la Salud ha recomendado el uso de vacunas orales como una herramienta para el control de la enfermedad en ciertas situaciones endémicas y epidémicas. En Cuba, a raíz de la epidemia de cólera que azotó a Perú en 1991, se obtuvo el candidato vacunal CV 638, el cual ha demostrado que es seguro, inmunogénico y protector

  7. El Perú frente a la Antártida: análisis preliminar

    Directory of Open Access Journals (Sweden)

    Beatriz Ramacciotti de Cubas

    1984-12-01

    Full Text Available La Antártida, el vasto continente del Hemisferio Austral, ya imaginado por los griegos muchos siglos atrás, región de aventuras, exploraciones y pacífica investigación científica, es hoy motivo de preocupación universal. La adhesión del Perú al Tratado Antártico,en abril de 1981, significó el reconocimiento de nuestro país al régimen jurídico negociado y establecido en Washington en 1959 para el Continente Austral.Para vislumbrar la importancia de la acción peruana, se presenta en primer lugar, una visión general de las condiciones geográficas y de los recursos naturales antárticos. Luego, se realiza una síntesis de los antecedentes históricos ( descubrimientos y exploraciones, presentándose además las principales teorías que sirven de fundamento a los reclamos de soberanía de distintos estados sobre sectores del frío continente. Seguidamente,se hace referencia a los principios del Tratado Antártico de 1959, mediante el cual se crea un régimenjurídico especial para la Antártida, convirtiéndola en una inmensa zona de investigación científica dentro de un marco de cooperación internacional,dejando congelados los reclamos territoriales por un lapso de 30 años.Pero a esta etapa de remanso parece avecinarse un tiempo nuevo: de un lado, la posible revisión del Tratado Antártico en 1991, está despertando los intereses nacionales de los estados reclamantes de soberanía y de otros estados (TercerMundo que en foros mundiales (ONU han solicitado que la Antártida sea considerada "Patrimonio Común de la Humanidad", y de otro lado.la posibilidad de la explotación de los abundantes recursos antárticos está generando una creciente competencia -a nivel oficial y privado-- de nacionesy empresas, por los beneficios económicos que de dicha explotación se generarían.

  8. Ecosystem services delivered by weaver ants

    DEFF Research Database (Denmark)

    Offenberg, Joachim

    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......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...... they convert pest insects into accessible and edible protein. In short, this review show that weaver ants in agriculture can increase crop yields, improve fruit quality, chemically deter pests, fertilize crops, reduce diseases, and produce protein for human and livestock consumption....

  9. Bio-inspired Ant Algorithms: A review

    Directory of Open Access Journals (Sweden)

    Sangita Roy

    2013-05-01

    Full Text Available Ant Algorithms are techniques for optimizing which were coined in the early 1990’s by M. Dorigo. The techniques were inspired by the foraging behavior of real ants in the nature. The focus of ant algorithms is to find approximate optimized problem solutions using artificial ants and their indirect decentralized communications using synthetic pheromones. In this paper, at first ant algorithms are described in details, then transforms to computational optimization techniques: the ACO metaheuristics and developed ACO algorithms. A comparative study of ant algorithms also carried out, followed by past and present trends in AAs applications. Future prospect in AAs also covered in this paper. Finally a comparison between AAs with well-established machine learning techniques were focused, so that combining with machine learning techniques hybrid, robust, novel algorithms could be produces for outstanding result in future.

  10. GRID SCHEDULING USING ENHANCED ANT COLONY ALGORITHM

    Directory of Open Access Journals (Sweden)

    P. Mathiyalagan

    2010-10-01

    Full Text Available Grid computing is a high performance computing used to solve larger scale computational demands. Task scheduling is a major issue in grid computing systems. Scheduling of tasks is the NP hard problem. The heuristic approach provides optimal solution for NP hard problems .The ant colony algorithm provides optimal solution. The existing ant colony algorithm takes more time to schedule the tasks. In this paper ant colony algorithm improved by enhancing pheromone updating rule such that it schedules the tasks efficiently and better resource utilization. The simulation results prove that proposed method reduces the execution time of tasks compared to existing ant colony algorithm.

  11. 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.

  12. Enhanced ants system and its application

    Institute of Scientific and Technical Information of China (English)

    2005-01-01

    NP-hard combinational optimization problem is not solved very well until now. One enhanced ants system based on ants system is advanced after analysis of the deficiencies of existing ants systems. Some improvements are made in state transfer rule and local modification rule. Furthermore, the enhanced ants system can solve NP-hard combinational optimization problem with restraints and condition path. The successful application of TSP problem and transportation net problem indicates that the proposed system has stronger function and higher efficiency than the original system.

  13. Ilmub suurmeister Evald Okase monograafia / Ants Juske

    Index Scriptorium Estoniae

    Juske, Ants, 1956-

    2009-01-01

    22. aprillil Kumu Kunstimuuseumis esitletavast monograafiast "Evald Okas", mille on kirjutanud Ants Juske, kujundanud Tiit Jürna. Evald Okasest, tema loomingust, elust Jaroslavlis ja rindekunstnikuna

  14. 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...

  15. Male parentage in army ants

    DEFF Research Database (Denmark)

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

    2006-01-01

    In most social insects workers do not mate, but have retained the ability to produce haploid eggs that can develop into viable male offspring. Under what circumstances this reproductive potential is realized and how the ensuing worker-queen conflict over male production is resolved, is an area...... 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...

  16. The distribution of weaver ant pheromones on host trees

    DEFF Research Database (Denmark)

    Offenberg, Joachim

    2007-01-01

    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...

  17. Plants in Your Ants: Using Ant Mounds to Test Basic Ecological Principles

    Science.gov (United States)

    Zettler, Jennifer A.; Collier, Alexander; Leidersdorf, Bil; Sanou, Missa Patrick

    2010-01-01

    Urban students often have limited access to field sites for ecological studies. Ubiquitous ants and their mounds can be used to study and test ecology-based questions. We describe how soil collected from ant mounds can be used to investigate how biotic factors (ants) can affect abiotic factors in the soil that can, in turn, influence plant growth.

  18. Conflict resolution in an ant-plant interaction: Acacia constricta traits reduce ant costs to reproduction.

    Science.gov (United States)

    Nicklen, E Fleur; Wagner, Diane

    2006-05-01

    Many plant species attract ants onto their foliage with food rewards or nesting space. However, ants can interfere with plant reproduction when they visit flowers. This study tests whether Acacia constricta separates visiting ant species temporally or spatially from newly opened inflorescences and pollinators. The diurnal activity patterns of ants and A. constricta pollinators peaked at different times of day, and the activity of pollinators followed the daily dehiscence of A. constricta inflorescences. In addition to being largely temporally separated, ants rarely visited open inflorescences. A floral ant repellent contributes to the spatial separation of ants and inflorescences. In a field experiment, ants of four species were given equal access to inflorescences in different developmental stages. On average, the frequency with which ants made initial, antennal contact with the floral stages did not differ, but ants significantly avoided secondary contact with newly opened inflorescences relative to buds and old inflorescences, and old inflorescences relative to buds. Ants also avoided contact with pollen alone, indicating that pollen is at least one source of the repellent. The results suggest A. constricta has effectively resolved the potential conflict between visiting ants and plant reproduction.

  19. Alternativas de manejo expectante de la rotura prematura de membranas antes de la viabilidad en embarazos únicos

    OpenAIRE

    Doren V,Adriana; Carvajal C.,Jorge

    2012-01-01

    La rotura prematura de membranas (RPM) antes de la viabilidad fetal constituye una complicación obstétrica de baja incidencia, pero que se asocia a una alta morbimortalidad materna y perinatal. No existen actualmente guías estandarizadas para el manejo expectante de esta patología, y las prácticas reportadas en la literatura para el enfrentamiento de este escenario clínico son variables. Aquí presentamos una revisión de la literatura de los últimos 10 años y proponemos una pauta de manejo par...

  20. 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.

  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

    OpenAIRE

    Luis Alberto Furlan

    2013-01-01

    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 deb...

  2. 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

  3. Spectacular Batesian mimicry in ants

    Science.gov (United States)

    Ito, Fuminori; Hashim, Rosli; Huei, Yek Sze; Kaufmann, Eva; Akino, Toshiharu; Billen, Johan

    2004-10-01

    The mechanism by which palatable species take advantage of their similarity in appearance to those that are unpalatable, in order to avoid predation, is called Batesian mimicry. Several arthropods are thought to be Batesian mimics of social insects; however, social insects that are Batesian mimics among themselves are rare. In Malaysia we found a possible Batesian mimic in an arboreal ant species, Camponotus sp., which was exclusively observed on foraging trails of the myrmicine ant Crematogaster inflata. The bright yellow and black colouring pattern, as well as the walking behaviour, were very similar in both species. We observed general interactions between the two species, and tested their palatability and the significance of the remarkably similar visual colour patterns for predator avoidance. Prey offered to C. inflata was also eaten by Camponotus workers in spite of their being attacked by C. inflata, indicating that Camponotus sp. is a commensal of C. inflata. An experiment with chicks as potential predators suggests that Camponotus sp. is palatable whereas C. inflata is unpalatable. After tasting C. inflata, the chicks no longer attacked Camponotus sp., indicating that Camponotus sp. is a Batesian mimic of Crematogaster inflata.

  4. La alfabetización funcional en una segunda lengua : una experiencia metodológica

    OpenAIRE

    Llorente Puerta, María Jesús

    2015-01-01

    Ante la realidad de un alumnado extranjero que carece de habilidades lectoescritoras y la necesidad de dotar a este alumnado de competencia comunicativa escrita, se plantea, en la primera parte del trabajo, una revisión de las características más significativas de la actividad específica de alfabetización en una Segunda Lengua y el contexto concreto en que se desarrolla la actividad con especial foco en aspectos relacionados con las diferentes esferas de la motivación y las características i...

  5. Dynamical Equilibrium of Interacting Ant Societies

    CERN Document Server

    Leok, B T M

    1996-01-01

    The sustainable biodiversity associated with a specific ecological niche as a function of land area is analysed computationally by considering the interaction of ant societies over a collection of islands. A power law relationship between sustainable species and land area is observed. We will further consider the effect a perturbative inflow of ants has upon the model.

  6. Open Problem: Analyzing Ant Robot Coverage

    Science.gov (United States)

    2010-01-01

    Efficient and inefficient ant coverage methods. Annals of Mathematics and Artificial Intelligence, 31, 41–76. The proofs can be found in the technical...Wagner, I., & Bruckstein, A. (2001). Special issue on ant robotics. Annals of Mathematics and Artificial Intelligence, 31. Wagner, I., Lindenbaum, M

  7. 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.

  8. Neuropeptidomics of the carpenter ant Camponotus floridanus.

    Science.gov (United States)

    Schmitt, Franziska; Vanselow, Jens T; Schlosser, Andreas; Kahnt, Jörg; Rössler, Wolfgang; Wegener, Christian

    2015-03-01

    Ants show a rich behavioral repertoire and a highly complex organization, which have been attracting behavioral and sociobiological researchers for a long time. The neuronal underpinnings of ant behavior and social organization are, however, much less understood. Neuropeptides are key signals that orchestrate animal behavior and physiology, and it is thus feasible to assume that they play an important role also for the social constitution of ants. Despite the availability of different ant genomes and in silico prediction of ant neuropeptides, a comprehensive biochemical survey of the neuropeptidergic communication possibilities of ants is missing. We therefore combined different mass spectrometric methods to characterize the neuropeptidome of the adult carpenter ant Camponotus floridanus. We also characterized the local neuropeptide complement in different parts of the nervous and neuroendocrine system, including the antennal and optic lobes. Our analysis identifies 39 neuropeptides encoded by different prepropeptide genes, and in silico predicts new prepropeptide genes encoding CAPA peptides, CNMamide as well as homologues of the honey bee IDLSRFYGHFNT- and ITGQGNRIF-containing peptides. Our data provides basic information about the identity and localization of neuropeptides that is required to anatomically and functionally address the role and significance of neuropeptides in ant behavior and physiology.

  9. 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

    2016-01-20

    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.

  10. 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

    Directory of Open Access Journals (Sweden)

    A. Juberías Sánchez

    2011-12-01

    Full Text Available 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 y a las Comunidades Autónomas. Debido a esta circunstancia, se dibuja, un nuevo escenario de actuación de los Servicios Farmacéuticos de la Defensa, bajo la tutela de la Agencia Española de Medicamentos y Productos Sanitarios. Objetivo: La aplicación de los principios de gestión del riesgo, posibilitará una rápida adaptación de la tecnología necesaria para la fabricación de comprimidos de fosfato de oseltamivir. Se realiza la evaluación del riesgo asociado a las diversas fases del proceso y se establecen determinados parámetros de control sobre la calidad final del medicamento producido. Material y Método: Se aplica el Análisis modal de fallos modales y efectos y su criticidad para establecer y evaluar los posibles riesgos del proceso productivo y se efectúan las correspondientes determinaciones analíticas referidas a la calidad del producto obtenido. Resultados: Los riesgos asociados al proceso son establecidos y evaluados. La media del contenido de los comprimidos y del porcentaje de disolución de los mismos a los 20 minutos es de 101,9 % y 102,5% respectivamente, cumpliendo todos los lotes fabricados el ensayo de evaluación de la contaminación microbiológica. Los resultados obtenidos para los lotes en las variables objeto de validación del proceso (peso de los comprimidos y porcentajes de principio activo, de homogeneidad de la mezcla y de disolución cumplen las especificaciones establecidas y no se aprecian diferencias

  11. Antthrushes, antpittas, and gnateaters (Aves, Formicariidae) as army ant followers

    OpenAIRE

    Edwin O. Willis

    1984-01-01

    Antthrushes (Formicarius, Chamaeza) sometimes walk around swarms of army ants and capture ground prey, but do not follow ants regularly. Among antpittas, only fast-leaping Pittasoma michleri and P. rufopileatum regularly follow ants. Gnateaters (Conopophaga) follow ants little. All these ground-foraging genera are poorly adapted for rapid flying, and failure to follow ants is perhaps due to inability to evade predators or out fly competitors near groups of birds attracted by ants.

  12. 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.

  13. Microclimatic conditions of Lasius flavus ant mounds

    Science.gov (United States)

    Véle, Adam; Holuša, Jaroslav

    2016-11-01

    Like other organisms, ants require suitable microclimatic conditions for their development. Thus, ant species inhabiting colder climates build nest mounds that rise above the soil surface, presumably to obtain heating from solar radiation. Although some ant species construct mounds of organic materials, which generate substantial heat due to microbial metabolism, Lasius flavus mounds consists mostly of soil, not organic material. The use of artificial shading in the current study demonstrated that L. flavus depends on direct solar radiation to regulate the temperature in its mound-like nests. Temperatures were much lower in shaded mounds than in unshaded mounds and were likely low enough in shaded mounds to reduce ant development and reproduction. In areas where L. flavus and similar ants are undesirable, they might be managed by shading.

  14. Modified chaotic ant swarm to function optimization

    Institute of Scientific and Technical Information of China (English)

    LI Yu-ying; WEN Qiao-yan; LI Li-xiang

    2009-01-01

    The chaotic ant swarm algorithm (CAS) is an optimization algorithm based on swarm intelligence theory, and it is inspired by the chaotic and self-organizing behavior of the ants in nature. Based on the analysis of the properties of the CAS, this article proposes a variation on the CAS called the modified chaotic ant swarm (MCAS), which employs two novel strategies to significantly improve the performance of the original algorithm. This is achieved by restricting the variables to search ranges and making the global best ant to learn from different ants' best information in the end. The simulation of the MCAS on five benchmark functions shows that the MCAS improves the precision of the solution.

  15. Fungal Adaptations to Mutualistic Life with Ants

    DEFF Research Database (Denmark)

    Kooij, Pepijn Wilhelmus

    . However, in rare occasions fungal symbionts might come into contact with symbionts from other colonies. I showed that in both leaf-cutting ant genera incompatibility reactions between fungal strains can avoid intermixing of different strains, and that these reactions strengthen when genetic distance...... successful. To understand the evolutionary development of domestication of the fungus over the phylogeny of the Attine ants, I compared the average number of nuclei per cell for the fungal symbionts, for each of the different groups of fungus-growing ants. I found that the fungal symbionts of the paleo...... is increased. This pattern, however, becomes distorted when fungal symbionts are contested across ant genera. The most important mechanism in the succession of this mutualism of leaf-cutting ants is the controlled degradation of plant material. I show that in the area of Gamboa, Panama, the two leaf...

  16. Optimal Load Dispatch Using Ant Lion Optimization

    Directory of Open Access Journals (Sweden)

    Menakshi Mahendru Nischal

    2015-08-01

    Full Text Available This paper presents Ant lion optimization (ALO technique to solve optimal load dispatch problem. Ant lion optimization (ALO is a novel nature inspired algorithm. The ALO algorithm mimics the hunting mechanism of ant lions in nature. Five main steps of hunting prey such as the random walk of ants, building traps, entrapment of ants in traps, catching preys, and re-building traps are implemented. Optimal load dispatch (OLD is a method of determining the most efficient, low-cost and reliable operation of a power system by dispatching available electricity generation resources to supply load on the system. The primary objective of OLD is to minimize total cost of generation while honoring operational constraints of available generation resources. The proposed technique is implemented on 3, 6 & 20 unit test system for solving the OLD. Numerical results shows that the proposed method has good convergence property and better in quality of solution than other algorithms reported in recent literature.

  17. 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.

  18. Some enzymic activities of two Australian ant venoms: a jumper ant Myrmecia pilosula and a bulldog ant Myrmecia pyriformis.

    Science.gov (United States)

    Matuszek, M A; Hodgson, W C; King, R G; Sutherland, S K

    1994-12-01

    Venoms from two related Australian ants, a jumper ant (Myrmecia pilosula) and a bulldog ant (Myrmecia pyriformis), were quantitatively analysed for the following enzymic activities: phospholipase A2, phospholipase B, phospholipase C, hyaluronidase, esterase, acid phosphatase, alkaline phosphatase and phosphodiesterase. Both venoms contained phospholipase A2, phospholipase B, hyaluronidase, acid phosphatase and alkaline phosphatase activities. Myrmecia pyriformis venom had significantly greater phospholipase B, acid phosphatase and alkaline phosphatase activities than Myrmecia pilosula venom. No detectable quantities of phospholipase C, esterase or phosphodiesterase activities were found in either venom.

  19. Evaluación del impacto funcional e intensidad del dolor antes y después de la inyección de esteroides por vía transforaminal en una muestra preliminar de pacientes con radiculopatía lumbar por hernia de disco Evaluation of functionality and pain intensity before and after a transformial steroid injection in a preliminary sample of patients with lumbar radiculopathy due to a disk hernia

    Directory of Open Access Journals (Sweden)

    P. Medel

    2007-04-01

    Full Text Available Objetivo: Evaluar el grado de mejoría en el estado funcional e intensidad del dolor, en una muestra preliminar de pacientes con radiculopatía compresiva lumbar por hernia de disco a quienes se les realizó una inyección de esteroides por vía transforaminal (ITE bajo guía fluoroscópica. Material y método: Se seleccionaron prospectivamente en el periodo de Octubre a Diciembre del 2006, pacientes con dolor de espalda baja por radiculopatía secundaria a hernia de disco lumbar corroborado por clínica e imagen de resonancia magnética y que presentaran mala respuesta al manejo conservador. Se evaluó la intensidad de dolor por medio de la Escala Visual Análoga (EVA y el índice de funcionalidad mediante el Cuestionario de Oswestry previo al ITE y posterior al mismo a los 7,14 y 30 días en todos los pacientes incluidos. Resultados: Se incluyeron a 14 pacientes; de ellos doce fueron mujeres (87.5% y dos varones (14.3%; con una edad promedio de 62 ± 12.8 (40-84. La intensidad de dolor antes del procedimiento, según la EVA fue de 74.0 ± 17.0. Se observaron diferencias significativas en la intensidad del dolor a los 7 (EVA 46.4 ± 22.4, 14 (EVA 45.0 ± 17.0 y 30 (EVA 46.4 ± 25.9 días después del ITE (p Objective: To evalUate the level of improvement in the functionality and pain intensity in a preliminary sample of patients with compressive lumbar radiculopathology due to disk hernia who received a transforaminal steroid injection (TSI under fluoroscopic guidance. Material and Method: From October to December 2006, patients experiencing back pain due to radiculopathy secondary to a lumbar disk hernia were selected. These diagnoses had to have been corroborated clinically and by a magnetic resonance image. Furthermore, these were patients that responded poorly to conservative management. Pain intensity was evaluated by Visual Analog Scale Analogy (VAS and the functionality by the Oswestry Questionnaire before the TSI and 7, 14 and 30 days

  20. Incesto: una plaga silenciada

    Directory of Open Access Journals (Sweden)

    Yamileth Ramírez Rodríguez

    2003-03-01

    Full Text Available Los costarricenses, hemos sido omisos ante los hechos incestuosos. Aun hoyes un tema tabú que suele silenciamos y por ende a veces quedan impunes. Cuando de investigación se trata, la cruda realidad es que la información es escueta, por lo que nos vimos obligados a acudir a la razón y a la experiencia de la humanidad en dicho campo, así como de nuestros despachos judiciales. El incesto es un crimen y constituye un abuso real en una relación de poder. De esta manera se dirá que el perpetrador puede ser un padre, padrastro, madre, abuelo, tío, hermanos, primos, sobrinos, etc. Pero se pretenderá dejar las bases para que esta terminología se pueda ampliar mas allá de la existencia del parentesco en línea directa.In Costa Rica, we have been omitted before acts of incest. For example, today it is still a taboo issue that keeps us in silence and that is part of the reason why this crime is still without punishment. When we investigate this topic, we find a hard reality: we do not have statistics; which is why we have to use the experiences of other people and our experience in the judicial bureau. Incest is a crime and a definite abuse in a relationship of power. In this manner, we are going to say that the perpetrator could be the father, stepfather, mother, grandpa, uncle, brothers, cousins, nephews, etc. In this essay we give the guidelines to extend this terminology and extend it to the existing familiar line of direct relatives.

  1. 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.

  2. Differential Recruitment of Camponotus femoratus (Fabricius) Ants in Response to Ant Garden Herbivory.

    Science.gov (United States)

    Vicente, R E; Dáttilo, W; Izzo, T J

    2014-12-01

    Although several studies have shown that ants can recognize chemical cues from their host plants in ant-plant systems, it is poorly demonstrated in ant gardens (AGs). In this interaction, ant species constantly interact with various epiphyte species. Therefore, it is possible to expect a convergence of chemical signals released by plants that could be acting to ensure that ants are able to recognize and defend epiphyte species frequently associated with AGs. In this study, it was hypothesized that ants recognize and differentiate among chemical stimuli released by AG epiphytes and non-AG epiphytes. We experimentally simulated leaf herbivore damage on three epiphyte species restricted to AGs and a locally abundant understory herb, Piper hispidum, in order to quantify the number of recruited Camponotus femoratus (Fabricius) defenders. When exposed to the AG epiphytes Peperomia macrostachya and Codonanthe uleana leaves, it was observed that the recruitment of C. femoratus workers was, on average, respectively 556% and 246% higher than control. However, the number of ants recruited by the AG epiphyte Markea longiflora or by the non-AG plant did not differ from paper pieces. This indicated that ants could discern between chemicals released by different plants, suggesting that ants can select better plants. These results can be explained by evolutionary process acting on both ants' capability in discerning plants' chemical compounds (innate attraction) or by ants' learning based on the epiphyte frequency in AGs (individual experience). To disentangle an innate behavior, a product of classical coevolutionary process, from an ant's learned behavior, is a complicated but important subject to understand in the evolution of ant-plant mutualisms.

  3. APLICACIÓN PARA EL RECONOCIMIENTO ANTE Y POS MORTEM DE SOLDADOS EN SERVICIO

    OpenAIRE

    Mauro Callejas Cuervo; Yolvy Amileth Turizo Ascencio; Diego Arturo Sánchez Cárdenas

    2009-01-01

    En este documento se explica el desarrollo de una solución informática (Programa Forensys) para el Grupo de Caballería Mecanizado Nº1 "Silva Plazas" (GMSIL) que facilita la identifi cación de los soldados ante y pos mortem utilizando la replicación de datos como servicio móvil para acceder a la información en tiempo real.

  4. APLICACIÓN PARA EL RECONOCIMIENTO ANTE Y POS MORTEM DE SOLDADOS EN SERVICIO

    Directory of Open Access Journals (Sweden)

    Mauro Callejas Cuervo

    2009-01-01

    Full Text Available En este documento se explica el desarrollo de una solución informática (Programa Forensys para el Grupo de Caballería Mecanizado Nº1 "Silva Plazas" (GMSIL que facilita la identifi cación de los soldados ante y pos mortem utilizando la replicación de datos como servicio móvil para acceder a la información en tiempo real.

  5. 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.

  6. 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

  7. 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.

  8. 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.

  9. Immune defense in leaf-cutting ants

    DEFF Research Database (Denmark)

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

    2011-01-01

    -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...... social defense, a Pseudonocardia bacteria that helps to control pathogens in the ants' fungus garden, showed a significant colony of origin by rearing environment interaction, whereby ants that acquired the bacteria of a foster colony obtained a less abundant cover of bacteria: one explanation...

  10. Ant colonies for the travelling salesman problem.

    Science.gov (United States)

    Dorigo, M; Gambardella, L M

    1997-01-01

    We describe an artificial ant colony capable of solving the travelling salesman problem (TSP). Ants of the artificial colony are able to generate successively shorter feasible tours by using information accumulated in the form of a pheromone trail deposited on the edges of the TSP graph. Computer simulations demonstrate that the artificial ant colony is capable of generating good solutions to both symmetric and asymmetric instances of the TSP. The method is an example, like simulated annealing, neural networks and evolutionary computation, of the successful use of a natural metaphor to design an optimization algorithm.

  11. Los sindicatos ante la conciliación de la vida laboral y familiar-personal

    OpenAIRE

    Miguélez, Fausto

    2007-01-01

    En este artículo se analizan las posturas de los sindicatos ante la conciliación, a partir, tanto de documentos oficiales legislativos europeos y españoles, como de entrevistas realizadas a afiliados sindicales. Así, vemos como la postura sindical, la articulación de la conciliación como un derecho colectivo no conlleva una conciliación real entre la vida laboral, la familiar y la personal, dada su identificación como medida para mujeres trabajadoras, sin implicar una nueva organización del t...

  12. La política europea de seguridad ante Estrategia de Seguridad Nacional de Estados Unidos

    OpenAIRE

    Martínez, María Celia

    2006-01-01

    Durante la década anterior al 11 de septiembre de 2001 se produjeron numerosos conflictos en todo el mundo sin que las potencias occidentales llegasen a definir los criterios estratégicos para tomar una decisión sobre una posible intervención. Nohabía un planteo estratégico claramente definido como el de la guerra fría, y así resultó de confusa la respuesta occidental ante la descomposición de estados surgidos al calor del enfrentamiento Washington- Moscú, como ocurrió en las antiguas Repú...

  13. 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.

  14. Personalidad ante el trauma en el siglo XXI: fragilidad y antifragilidad ante el trauma

    Directory of Open Access Journals (Sweden)

    E. Samper Lucena

    Full Text Available El trauma psicológico es un tema de máxima actualidad, tanto por la cantidad de literatura científica desarrollada en los últimos años como por los cambios producidos en su diagnóstico fruto de la investigación, produciéndose un gran debate al respecto desde la aparición del último manual de diagnóstico de los trastornos mentales de la Asociación Americana de Psiquiatría (APA. En este artículo se trata de dar una visión de conjunto y actual sobre el trauma y el estrés postraumático. Qué diferencias existen en las personas que las hacen a unas más frágiles y vulnerables ante los traumas, mientras que otras son más resistentes o antifrágiles. Factores como la herencia, la personalidad, o los trastornos previos de tipo mental, van a marcar estas diferencias. No se trata de la situación traumática, sino de cómo la vive cada persona, lo que marcará la diferencia en fragilidad. Todas las personas alguna vez en su vida se ven expuestas a situaciones traumáticas. Algunas por su trabajo tienen que afrontar de forma continua a estas situaciones, provocando, en ocasiones, lo que se denomina un estrés traumático secundario, que afecta a la persona y a la organización, mermando la operatividad, y asociado a determinados factores. Unos de tipo personal (Neuroticismo, extraversión, humor, empatía, etc. y otros de la propia organización (Orgullo, liderazgo, equipo, estrés de rol, etc.. Es importante conocer estas fragilidades para realizar un tratamiento preventivo en la población afectada por una catástrofe, y en los profesionales en particular para poder identificar el perfil más adecuado para determinados puestos. (Militares, policías, bomberos, médicos....

  15. Faster-is-slower effect in escaping ants revisited: Ants do not behave like humans

    CERN Document Server

    Parisi, Daniel R; Josens, Roxana

    2014-01-01

    In this work we studied the trajectories, velocities and densities of ants when egressing under controlled levels of stress produced by a chemical repellent at different concentrations. We found that, unlike other animals escaping under life-and-death conditions and pedestrian simulations, ants do not produce a higher density zone near the exit door. Instead, ants are uniformly distributed over the available space allowing for efficient evacuations. Consequently, the faster-is-slower effect observed in ants (Soria et al., 2012) is clearly of a different nature to that predicted by de social force model. In the case of ants, the minimum evacuation time is correlated with the lower probability of taking backward steps. Thus, as biological model ants have important differences that make their use inadvisable for the design of human facilities.

  16. Los procesos ante los juzgados de violencia sobre la mujer

    OpenAIRE

    Laguna Pontanilla, Gonzalo

    2015-01-01

    La entrada en vigor de la "Ley Organica 1/2004, de 28 de diciembre, de Medidas de Protección integral contra la Violencia de Género, generó desde su origen graves críticas, a nivel ideológico, dogmático y doctrinal, y una compleja y heterogénea problemática en la práctica judicial que cristalizó en diversas cuestiones interpretativas que plantea la aplicación práctica de la Ley Integral a diario en los proxcesos seguidos ante los juzgados de Violencia sobre la Mujer. La tesis aborda la neces...

  17. 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.

  18. 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.

  19. Multitasking in a plant-ant interaction: how does Acacia myrtifolia manage both ants and pollinators?

    Science.gov (United States)

    Martínez-Bauer, Angélica E; Martínez, Gerardo Cerón; Murphy, Daniel J; Burd, Martin

    2015-06-01

    Plant associations with protective ants are widespread among angiosperms, but carry the risk that ants will deter pollinators as well as herbivores. Such conflict, and adaptations to ameliorate or prevent the conflict, have been documented in African and neotropical acacias. Ant-acacia associations occur in Australia, but little is known of their ecology. Moreover, recent phylogenetic evidence indicates that Australian acacias are only distantly related to African and American acacias, providing an intercontinental natural experiment in the management of ant-pollinator conflict. We examined four populations of Acacia myrtifolia over a 400-km environmental gradient in southeastern Australia using ant and pollinator exclusion as well as direct observation of ants and pollinators to assess the potential for ant-pollinator conflict to affect seed set. Native bees were the only group of floral visitors whose visitation rates were a significant predictor of fruiting success, although beetles and wasps may play an important role as "insurance" pollinators. We found no increase in pollinator visitation or fruiting success following ant exclusion, even with large sample sizes and effective exclusion. Because ants are facultative visitors to A. myrtifolia plants, their presence may be insufficient to interfere greatly with floral visitors. It is also likely that the morphological location of extrafloral nectaries tends to draw ants away from reproductive parts, although we commonly observed ants on inflorescences, so the spatial separation is not strict. A. myrtifolia appears to maintain a generalized mutualism over a wide geographic range without the need for elaborate adaptations to resolve ant-pollinator conflict.

  20. 9 CFR 354.121 - Ante-mortem inspection.

    Science.gov (United States)

    2010-01-01

    ... 9 Animals and Animal Products 2 2010-01-01 2010-01-01 false Ante-mortem inspection. 354.121 Section 354.121 Animals and Animal Products FOOD SAFETY AND INSPECTION SERVICE, DEPARTMENT OF AGRICULTURE... Procedures; Ante-Mortem Inspections § 354.121 Ante-mortem inspection. An ante-mortem inspection of...

  1. 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 species...

  2. 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....

  3. Rose Atoll - Eradication of Invasive Ants

    Data.gov (United States)

    US Fish and Wildlife Service, Department of the Interior — There are at least 9 species of ants introduced to Rose Atoll, including species that tend to scale insects that are devastating the Pisonia grandis trees on the 15...

  4. KohonAnts: A Self-Organizing Ant Algorithm for Clustering and Pattern Classification

    CERN Document Server

    Fernandes, C; Merelo, J J; Ramos, V; Laredo, J L J

    2008-01-01

    In this paper we introduce a new ant-based method that takes advantage of the cooperative self-organization of Ant Colony Systems to create a naturally inspired clustering and pattern recognition method. The approach considers each data item as an ant, which moves inside a grid changing the cells it goes through, in a fashion similar to Kohonen's Self-Organizing Maps. The resulting algorithm is conceptually more simple, takes less free parameters than other ant-based clustering algorithms, and, after some parameter tuning, yields very good results on some benchmark problems.

  5. Deterministic ants in labirynth -- information gained by map sharing

    CERN Document Server

    Malinowski, Janusz

    2014-01-01

    A few of ant robots are dropped to a labirynth, formed by a square lattice with a small number of nodes removed. Ants move according to a deterministic algorithm designed to explore all corridors. Each ant remembers the shape of corridors which she has visited. Once two ants met, they share the information acquired. We evaluate how the time of getting a complete information by an ant depends on the number of ants, and how the length known by an ant depends on time. Numerical results are presented in the form of scaling relations.

  6. Eros antes que Prometeo. Reconsideración de la filosofía de la tecnología de Ortega: Una relectura de su Meditación a la Técnica desde el principio de la biomímesis

    Directory of Open Access Journals (Sweden)

    Jorge Riechman

    2009-01-01

    Full Text Available Una relectura crítica de uno de los textos seminales de la filosofía de la tecnología del siglo XX, la Meditación de la técnica de Ortega y Gasset (1933, permite ganar perspectiva para valorar la encrucijada civilizatoria donde nos encontramos hoy. Remedando el lema del Foro Social Mundial de Porto Alegre: muchas técnicas son posibles y otras técnicas son posibles, pero ¿seguiremos la vía de una técnica biomimética capaz de aprender de la naturaleza o, más bien, nos embarcaremos en las dudosas aventuras que nos propone la tecnociencia sintética? Eros ha de situarse en el puesto de mando, frente al impulso tanático que alienta en la tecnociencia.

  7. An Improved Heuristic Ant-Clustering Algorithm

    Institute of Scientific and Technical Information of China (English)

    Yunfei Chen; Yushu Liu; Jihai Zhao

    2004-01-01

    An improved heuristic ant-clustering algorithm(HAC)is presented in this paper. A device of 'memory bank' is proposed,which can bring forth heuristic knowledge guiding ant to move in the bi-dimension grid space.The device experiments on real data sets and synthetic data sets.The results demonstrate that HAC has superiority in misclassification error rate and runtime over the classical algorithm.

  8. Una forma de violencia: el acoso escolar

    OpenAIRE

    2014-01-01

    El presente trabajo ofrece una perspectiva del término “bullying” desde diversos puntos de vista como el aspecto jurídico o el tratamiento por parte de la prensa; manifestando las consecuencias que tuvo en la opinión pública un determinado caso que supuso un punto de inflexión en el interés general ante unos hechos que cambiaron la forma de percibir, manejar y enfrentarse a dicho fenómeno, así mismo crear unos protocolos para discernir entre las conductas propias de la convivencia escolar y e...

  9. El centenario de una obra maestra

    Directory of Open Access Journals (Sweden)

    Abelardo Forero Benavides

    1966-01-01

    Full Text Available En este año se celebra el centenario de una obra maestra, La historia de Francia, escrita por Julio Michelet. Y esa obra se complementa con la Historia de la revoluci6n francesa. Los treinta volúmenes se inician con la romanización de las Galias por César, "esa pálida figura, marchita antes de la edad por los excesos de Roma, ese hombre delicado y epiléptico" y concluyen en el momento en que la guillotina da su tenible mordisco a la cabeza de Robespierre.

  10. The social theory of risk. A first approach to social vulnerability of agricultural producers in the Southwest of Buenos Aires to adverse climatic events La teoría social del riesgo. Una primera aproximación a la vulnerabilidad social de los productores agropecuarios del Sudoeste bonaerense ante eventos climáticos adversos

    Directory of Open Access Journals (Sweden)

    María Isabel Andrade

    2009-01-01

    Full Text Available This communication is the first approach to the study of the Social Theory of Risk applied to farmers who have suffered from adverse weather events over five years. We believe that from the social theory of risk can be known and deepened in a more holistic conception of social vulnerability of farmers in this area. We also believe that knowledge of certain risk factors and decision-making process resulting from a complex plot that involves subjective factors, objective factors such as accumulated and historically constructed that can lead to further strengthening organizational experiences.Esta comunicación constituye una primera aproximación al estudio de la Teoría Social del Riesgo aplicada a los productores agropecuarios que vienen sufriendo fenómenos meteorológicos adversos desde hace más de cinco años. Creemos que desde la teoría social del riesgo puede conocerse y profundizarse una perspectiva más integral en la concepción de la vulnerabilidad social de los productores agropecuarios de esta zona. Además, consideramos que el conocimiento de determinados factores de riesgo y el proceso de toma de decisiones resultan de una trama compleja que involucra factores objetivos como factores subjetivos acumulados y construidos históricamente que pueden llevar a fortalecer nuevas experiencias organizacionales.

  11. 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.

  12. 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.

  13. Entangled active matter: From cells to ants

    Science.gov (United States)

    Hu, D. L.; Phonekeo, S.; Altshuler, E.; Brochard-Wyart, F.

    2016-07-01

    Both cells and ants belong to the broad field of active matter, a novel class of non-equilibrium materials composed of many interacting units that individually consume energy and collectively generate motion or mechanical stresses. However cells and ants differ from fish and birds in that they can support static loads. This is because cells and ants can be entangled, so that individual units are bound by transient links. Entanglement gives cells and ants a set of remarkable properties usually not found together, such as the ability to flow like a fluid, spring back like an elastic solid, and self-heal. In this review, we present the biology, mechanics and dynamics of both entangled cells and ants. We apply concepts from soft matter physics and wetting to characterize these systems as well as to point out their differences, which arise from their differences in size. We hope that our viewpoints will spur further investigations into cells and ants as active materials, and inspire the fabrication of synthetic active matter.

  14. 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.

  15. Ecología vegetal en la Antártida

    Directory of Open Access Journals (Sweden)

    L.G. Sancho

    2011-01-01

    Full Text Available A menudo se ha descrito la vida vegetal en la Antártida como extremadamente pobre y ecológicamente simple. Sin embargo, esto sólo es cierto si nos referimos a las localidades más inhóspitas de la Antártida continental. En la región conocida como Antártida marítima, costa occidental de la Península Antártica e islas adyacentes, la situación es bien distinta. El número de especies de líquenes supera las 350 y se han descrito más de 100 especies de musgos y hepáticas, aunque sólo existen dos plantas con flores. En el ámbito de la ecología vegetal, la cuestión fundamental que ha preocupado a los investigadores hasta ahora es si los líquenes y musgos de la Antártida presentan algún tipo de adaptación que les permita sobrevivir mejor que otras plantas en este medio. Un segundo aspecto de gran interés en la actualidad es determinar la capacidad de adaptación de la flora antártica ante el aumento de la radiación ultravioleta (UV como consecuencia del agujero de ozono, y ante el calentamiento global. Los líquenes antárticos se han mostrado muy tolerantes a amplios periodos de frío y sequía y son capaces de mantener una fotosíntesis activa a temperatura por debajo del punto de congelación, sin embargo algunas de las especies estudiadas no son capaces de mantener tasas positivas de fotosíntesis si la temperatura sube dos o tres grados. Por otra parte, tanto musgos como líquenes se muestran muy resistentes a la radiación UV. Los líquenes y comunidades microbianas de los Valles Secos y Montañas Transantárticas no parecen limitados por la más dura combinación de frío, sequedad y radiación que se produce en nuestro planeta. Estas especies son excelentes candidatos para experimentos de astrobiología en el espacio exterior, con el fin de demostrar la capacidad de supervivencia de células complejas originadas en la Tierra a posibles transferencias interplanetarias.

  16. Vivienda y Emergencia ante desastres naturales producidos por Sismos. Sismo de 1997 en la comuna de Punitaqui, Chile

    OpenAIRE

    2003-01-01

    En la resolución de la emergencia habitacional, si bien existe una coordinación entre las diferentes instituciones públicas, la vivienda transitoria ha sido históricamente una tipología de vivienda denominada mediagua por todos los sectores. Lo anterior permite afirmar que Chile no posee una propuesta de solución habitacional para resolver emergencias ante catástrofes naturales, siendo necesario y urgente avanzar en la búsqueda de propuestas eficientes y ade...

  17. 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

  18. Bacterial associates of arboreal ants and their putative functions in an obligate ant-plant mutualism.

    Science.gov (United States)

    Eilmus, Sascha; Heil, Martin

    2009-07-01

    Bacterial communities are highly diverse and have great ecological importance. In the present study, we used an in silico analysis of terminal restriction fragments (tRF) to characterize the bacterial community of the plant ant Pseudomyrmex ferrugineus. This species is an obligate inhabitant of Acacia myrmecophytes and feeds exclusively on plant-derived food sources. Ants are the dominant insect group in tropical rain forests. Associations of ants with microbes, which contribute particularly to the ants' nitrogen nutrition, could allow these insects to live on mostly or entirely plant-based diets and could thus contribute to the explanation of the high abundances that are reached by tropical ants. We found tRF patterns representing at least 30 prokaryotic taxa, of which the Acidobacteria, Actinobacteria, Bacteroidetes, Firmicutes, Planctomycetes, Proteobacteria, and Spirochaetes comprised 93%. Because most bacterial taxa were found in all ant-derived samples studied and because the bacteria detected on the ants' host plant revealed little overlap with this community, we regard our results as reliably representing the bacterial community that is associated with P. ferrugineus. Genera with a likely function as ant symbionts were Burkholderia, Pantoea, Weissella, and several members of the Enterobacteriaceae. The presence of these and various other groups was confirmed via independent PCR and cultivation approaches. Many of the bacteria that we detected belong to purportedly N-fixing taxa. Bacteria may represent important further partners in ant-plant mutualisms, and their influences on ant nutrition can contribute to the extraordinary abundance and evolutionary success of tropical arboreal ants.

  19. 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

  20. Modulación de la diferenciación de células dendríticas por antígenos tumorales pulmonares

    OpenAIRE

    Carrillo, Edward Fabián; Delgado,Gabriela; Ojeda, Paulina; Rodriguez, Carlos Alberto; Buitrago, Miguel; Aristizábal, Fabio Ancízar

    2010-01-01

    El cáncer es, en la actualidad, un serio problema de salud pública en el ámbito mundial. Una de las aproximaciones más exploradas desde hace cerca de veinte años, es la inmunoterapia con células dendríticas (CD), células presentadoras de antígenos (CPA) profesionales. No obstante, los resultados de los estudios clínicos que emplean CD autólogas pulsadas con antígenos tumorales no han sido tan exitosos como se proyectaba. Una de las hipótesis propuestas que justifique la eficaci...

  1. Solution to the problem of ant being stuck by ant colony routing algorithm

    Institute of Scientific and Technical Information of China (English)

    ZHAO Jing; TONG Wei-ming

    2009-01-01

    Many ant colony routing (ACR) algorithms have been presented in recent years, but few have studied the problem that ants will get stuck with probability in any terminal host when they are searching paths to route packets around a network. The problem has to be faced when designing and implementing the ACR algorithm. This article analyzes in detail the differences between the ACR and the ant colony optimization (ACO). Besides, particular restrictions on the ACR are pointed out and the three causes of ant being-stuck problem are obtained. Furthermore, this article proposes a new ant searching mechanism through dual path-checking and online routing loop removing by every intermediate node an ant visited and the destination host respectively, to solve the problem of ant being stuck and routing loop simultaneously. The result of numerical simulation is abstracted from one real network. Compared with existing two typical ACR algorithms, it shows that the proposed algorithm can settle the problem of ant being stuck and achieve more effective searching outcome for optimization path.

  2. Producción de los antígenos ESAT-6 y CFP-10 de Mycobacterium tuberculosis y evaluación de sus potencialidades en el serodiagnóstico de la tuberculosis activa en una población cubana

    OpenAIRE

    Elsa T. Pimienta-Rodríguez; Caridad Rodríguez-Valdés; Mónica Sarzo-Gómez; Carlos Vallín-Plou

    2012-01-01

    Mycobacterium tuberculosis (Mtb) es el agente causal de la tuberculosis humana (TB), la cual es la enfermedad infecciosa de mayor prevalencia mundial causada por una bacteria. En el 2009 hubo un estimado de 9,4 millones de nuevos casos y se estima que un tercio de la población mundial está infectada con Mtb. Debido a esta situación, el diagnóstico temprano y eficaz de la TB es vital para controlar su expansión y mortalidad. En este trabajo se clonaron los genes esat-6 y cfp-10 del genoma de...

  3. Les histiocitosis de cèl.lules no de Langerhans en el nen: Contribució al seu coneixement mitjançant estudis clínics, histològics, immunohistoquímics i ultraestructurals en una revisió de 153 casos

    OpenAIRE

    Grimalt Santacana, Ramon

    1995-01-01

    A partir d'uns casos limítrofes vists al Departament de Dermatologia i d'alguns casos descrits a la literatura, vàrem observar que algunes formes d'histiocitosis de cèl·lules no de Langerhans (HCNL) no podien ser diagnosticades d'acord amb els criteris establerts pels autors quan inicialment les varen descriure. Provablement aquests casos limítrofes als quals ens referim no constitueixen pas els "primers casos" d'una nova entitat sinó que són formes mixtes o cavalcades de HCNL. Per tal de fer...

  4. The descent of ant: field-measured performance of gliding ants.

    Science.gov (United States)

    Munk, Yonatan; Yanoviak, Stephen P; Koehl, M A R; Dudley, Robert

    2015-05-01

    Gliding ants avoid predatory attacks and potentially mortal consequences of dislodgement from rainforest canopy substrates by directing their aerial descent towards nearby tree trunks. The ecologically relevant measure of performance for gliding ants is the ratio of net horizontal to vertical distance traveled over the course of a gliding trajectory, or glide index. To study variation in glide index, we measured three-dimensional trajectories of Cephalotes atratus ants gliding in natural rainforest habitats. We determined that righting phase duration, glide angle, and path directness all significantly influence variation in glide index. Unsuccessful landing attempts result in the ant bouncing off its target and being forced to make a second landing attempt. Our results indicate that ants are not passive gliders and that they exert active control over the aerodynamic forces they experience during their descent, despite their apparent lack of specialized control surfaces.

  5. Ants as shell collectors: notes on land snail shells found around ant nests

    Directory of Open Access Journals (Sweden)

    Barna Páll-Gergely

    2009-03-01

    Full Text Available We investigated the shell collecting activities of harvester ants (Messor spp. in semi-arid grasslands and shrubs in Turkey. We found eleven species of snails in the area, two of them were not collected by ants. Eight – mainly small sized – snail species were found on ant nests in a habitat characterized by shrubs, three in rocky grassland and four in a grassland habitat. Some shells (e.g. Chondrus zebrula tantalus, Multidentula ovularis might be taken into the nests, and we hypothesise that some of these snail species are consumed by ants (Monacha spp.. From a fauna inventory perspective, shell collecting activities of harvester ant may help malacologists to find snail species which are normally hidden for a specialist (e.g. Oxychilus hydatinus, Cecilioides spp. due to their special habits.

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

    DEFF Research Database (Denmark)

    Offenberg, Hans Joachim

    2011-01-01

    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...... 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...... (Fabricius) was tested under laboratory conditions. Of the two types of food offered, the ants ingested 76% pure sucrose and 24% insect prey (dry weights) leading to ECI’s of 29% and 39% including brood only or brood plus imago gain, respectively. Based on Thai sugar and protein food costs and ant brood...

  7. Impacts of residual insecticide barriers on perimeter-invading ants, with particular reference to the odorous house ant, Tapinoma sessile.

    Science.gov (United States)

    Scharf, Michael E; Ratliff, Catina R; Bennett, Gary W

    2004-04-01

    Three liquid insecticide formulations were evaluated as barrier treatments against perimeter-invading ants at a multifamily housing complex in West Lafayette, IN. Several ant species were present at the study site, including (in order of abundance) pavement ant, Tetramorium caespitum (L.); honey ant, Prenolepis imparis (Say); odorous house ant, Tapinoma sessile (Say); thief ant, Solenopsis molesta (Say); acrobat ant, Crematogaster ashmeadi (Mayr); crazy ant, Paratrechina longicornis (Latrielle), field ants, Formica spp.; and carpenter ant Camponotus pennsylvanicus (DeGeer). Studies began in May 2001 and concluded 8 wk later in July. Individual replicate treatments were placed 0.61 in (2 feet) up and 0.92 m (3 feet) out from the ends of 46.1 by 10.1-m (151 by 33-foot) apartment buildings. Ant sampling was performed with 10 placements of moist cat food for 1 h within treatment zones, followed by capture and removal of recruited ants for later counting. All treatments led to substantial reductions in ant numbers relative to untreated controls. The most effective treatment was fipronil, where 2% of before-treatment ant numbers were present at 8 wk after treatment. Both imidacloprid and cyfluthrin barrier treatments had efficacy comparative with fipronil, but to 4 and 2 wk, respectively. Odorous house ants were not sampled before treatment. Comparisons of ant species composition between treatments and controls revealed an increase in odorous house ant frequencies at 1-8 wk after treatment in treated locations only. These results demonstrate efficacy for both nonrepellent and repellent liquid insecticides as perimeter treatments for pest ants. In addition, our findings with odorous house ant highlight an apparent invasive-like characteristic of this species that may contribute to its dramatic increase in structural infestation rates in many areas of the United States.

  8. 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

  9. Ant-egg cataract. An electron microscopic study

    DEFF Research Database (Denmark)

    Schrøder, H D; Nissen, S H

    1979-01-01

    The ultrastructure of the ant-egg cataractous lens has been studied. Comparison of tissue demineralized by means of EDTA with untreated tissue showed the calcium salts in the ant-eggs to be mostly crystalline. A laminar appearance of the ant-egg seen in EDTA treated material suggested an intermit......The ultrastructure of the ant-egg cataractous lens has been studied. Comparison of tissue demineralized by means of EDTA with untreated tissue showed the calcium salts in the ant-eggs to be mostly crystalline. A laminar appearance of the ant-egg seen in EDTA treated material suggested...

  10. Los procesos curriculares de postgrado: una necesidad del tercer milenio

    Directory of Open Access Journals (Sweden)

    Homero Fuentes González

    1997-10-01

    Full Text Available Ante el problema que presentan las instituciones educacionales universitarias en el desarrollo de la formación postgradual de sus egresados en el presente artículo se da un enfoque sistémico del postgrado y se caracterizan sus diferentes figuras, su concepción y organización en una contextualización de los procesos universitarios.

  11. Hopfield neural network based on ant system

    Institute of Scientific and Technical Information of China (English)

    洪炳镕; 金飞虎; 郭琦

    2004-01-01

    Hopfield neural network is a single layer feedforward neural network. Hopfield network requires some control parameters to be carefully selected, else the network is apt to converge to local minimum. An ant system is a nature inspired meta heuristic algorithm. It has been applied to several combinatorial optimization problems such as Traveling Salesman Problem, Scheduling Problems, etc. This paper will show an ant system may be used in tuning the network control parameters by a group of cooperated ants. The major advantage of this network is to adjust the network parameters automatically, avoiding a blind search for the set of control parameters.This network was tested on two TSP problems, 5 cities and 10 cities. The results have shown an obvious improvement.

  12. Detection of mitochondrial COII DNA sequences in ant guts as a method for assessing termite predation by ants.

    Science.gov (United States)

    Fayle, Tom M; Scholtz, Olivia; Dumbrell, Alex J; Russell, Stephen; Segar, Simon T; Eggleton, Paul

    2015-01-01

    Termites and ants contribute more to animal biomass in tropical rain forests than any other single group and perform vital ecosystem functions. Although ants prey on termites, at the community level the linkage between these groups is poorly understood. Thus, assessing the distribution and specificity of ant termitophagy is of considerable interest. We describe an approach for quantifying ant-termite food webs by sequencing termite DNA (cytochrome c oxidase subunit II, COII) from ant guts and apply this to a soil-dwelling ant community from tropical rain forest in Gabon. We extracted DNA from 215 ants from 15 species. Of these, 17.2 % of individuals had termite DNA in their guts, with BLAST analysis confirming the identity of 34.1 % of these termites to family level or better. Although ant species varied in detection of termite DNA, ranging from 63 % (5/7; Camponotus sp. 1) to 0 % (0/7; Ponera sp. 1), there was no evidence (with small sample sizes) for heterogeneity in termite consumption across ant taxa, and no evidence for species-specific ant-termite predation. In all three ant species with identifiable termite DNA in multiple individuals, multiple termite species were represented. Furthermore, the two termite species that were detected on multiple occasions in ant guts were in both cases found in multiple ant species, suggesting that ant-termite food webs are not strongly compartmentalised. However, two ant species were found to consume only Anoplotermes-group termites, indicating possible predatory specialisation at a higher taxonomic level. Using a laboratory feeding test, we were able to detect termite COII sequences in ant guts up to 2 h after feeding, indicating that our method only detects recent feeding events. Our data provide tentative support for the hypothesis that unspecialised termite predation by ants is widespread and highlight the use of molecular approaches for future studies of ant-termite food webs.

  13. Detection of mitochondrial COII DNA sequences in ant guts as a method for assessing termite predation by ants.

    Directory of Open Access Journals (Sweden)

    Tom M Fayle

    Full Text Available Termites and ants contribute more to animal biomass in tropical rain forests than any other single group and perform vital ecosystem functions. Although ants prey on termites, at the community level the linkage between these groups is poorly understood. Thus, assessing the distribution and specificity of ant termitophagy is of considerable interest. We describe an approach for quantifying ant-termite food webs by sequencing termite DNA (cytochrome c oxidase subunit II, COII from ant guts and apply this to a soil-dwelling ant community from tropical rain forest in Gabon. We extracted DNA from 215 ants from 15 species. Of these, 17.2 % of individuals had termite DNA in their guts, with BLAST analysis confirming the identity of 34.1 % of these termites to family level or better. Although ant species varied in detection of termite DNA, ranging from 63 % (5/7; Camponotus sp. 1 to 0 % (0/7; Ponera sp. 1, there was no evidence (with small sample sizes for heterogeneity in termite consumption across ant taxa, and no evidence for species-specific ant-termite predation. In all three ant species with identifiable termite DNA in multiple individuals, multiple termite species were represented. Furthermore, the two termite species that were detected on multiple occasions in ant guts were in both cases found in multiple ant species, suggesting that ant-termite food webs are not strongly compartmentalised. However, two ant species were found to consume only Anoplotermes-group termites, indicating possible predatory specialisation at a higher taxonomic level. Using a laboratory feeding test, we were able to detect termite COII sequences in ant guts up to 2 h after feeding, indicating that our method only detects recent feeding events. Our data provide tentative support for the hypothesis that unspecialised termite predation by ants is widespread and highlight the use of molecular approaches for future studies of ant-termite food webs.

  14. A influenza invisível: a resposta comunitária à pandemia de 1918-1920 no norte rural da Suécia Invisible flu: community response to the 1918-1920 flu pandemic in the rural areas of north Sweden

    Directory of Open Access Journals (Sweden)

    Elisabeth Engberg

    2009-12-01

    Full Text Available Ao longo da história humana, pandemias recorrentes de influenza têm afetado indivíduos e sociedades em todo o mundo. No entanto, as respostas sociais têm variado no tempo e no espaço. Este artigo discute a resposta da sociedade à influenza espanhola de 1918-1920 no norte rural da Suécia, focando as medidas tomadas pelas comunidades locais para fazer frente à pandemia que avançava. Nas cinco comunidades rurais estudadas, a resposta oficial foi esparsa e reativa, e a presença da influenza pandêmica é quase invisível nos registros municipais. Medidas preventivas em potencial, tais como o fechamento de escolas e proibições de aglomerações públicas, foram utilizadas inadequadamente e introduzidas tarde demais para que fossem eficazes. Como algumas explicações para a aparente inércia das autoridades locais durante a influenza espanhola sugerem-se a luta, então corrente, contra as privações de uma época de guerra, a crise de alimentos somada a uma economia tensa, uma insuficiente administração pública de saúde, uma política pública nacional preventiva que almejava primordialmente à prevenção da cólera e o uso continuado de métodos tradicionais para se lidar com crise na sociedade.Throughout human history, recurrent influenza pandemics have affected individuals and societies all over the world. Yet the social responses have varied with time and space. This article discusses society's response to the Spanish influenza of 1918-1920 in northern rural Sweden, focusing on measures taken by local communities to meet the advancing pandemic. In the five studied rural communities, the official response was sparse and reactive, and the presence of pandemic influenza is almost invisible in the municipal records. Potentially preventive measures, such as school closures and bans on public gatherings, were used inadequately and introduced far too late to be effective. The current struggle with wartime hardship, food crisis and a

  15. 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...... 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...

  16. Música y Literatura. Una Propuesta Didáctica

    OpenAIRE

    Ortiz de Urbina y Sobrino, Paloma

    2000-01-01

    Sorprendida, como profesora de lengua alemana, ante la práctica ausencia de material didáctico referido a una manifestación cultural tan importante y tan profundamente enraizada como es la tradición musical en los países de habla alemana y convencida de la utilidad de la música clásica en la enseñanza no sólo del alemán, sino de cualquier lengua extranjera, he iniciado una serie de experimentos didácticos con mis alumnos cuyos contenidos y resultados trataré de exponer a lo largo de mi interv...

  17. 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.

  18. Aproximación a una pedagogía de los intercambios en el aprendizaje de una lengua extranjera

    OpenAIRE

    Del Olmo Renedo, Daudencio

    1995-01-01

    El avance en el desarrollo de una pedagogía de los intercambios llevará a los enseñantes de los distintos países, comprometidos con su formación, a compartir un lenguaje común, a crear una cultura profesional común y, por lo mismo, a entenderse y a trabajar conjuntamente, en la seguridad de que su paso por el otro sistema educativo, relativizando el propio, ha ampliado su horizonte pedagógico.

  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. 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.

  1. Variation in Extrafloral Nectary Productivity Influences the Ant Foraging

    Science.gov (United States)

    2017-01-01

    Extrafloral nectar is the main food source offered by plants to predatory ants in most land environments. Although many studies have demonstrated the importance of extrafloral nectaries (EFNs) to plant defense against herbivores, the influence of EFNs secretory activity pattern on predatory ants remains yet not fully understood. Here, we verified the relation between the extrafloral nectar production of a plant community in Cerrado in different times of the day, and its attractiveness to ants. The extrafloral nectaries (EFNs) of seven plant species showed higher productivity overnight. Ant abundance was higher in times of large extrafloral nectar production, however, there was no positive relation between ant richness on plants and EFNs productivity. There was temporal resource partitioning among ant species, and it indicates strong resource competition. The nectar productivity varied among plant species and time of the day, and it influenced the visitation patterns of ants. Therefore, EFNs are a key ant-plant interaction driver in the studied system. PMID:28046069

  2. 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.

  3. Research on the Perceptual Law of Artificial Ants

    Institute of Scientific and Technical Information of China (English)

    ZHENG Zhaobao

    2005-01-01

    Beginning with the analysis of the behavior of natural ants, this paper illuminates the principle and method that, by adopting image texture energy as pheromone and finding their way on the track of the pheromone, artificial ants have the ability to identify and remember through similar measurement of pheromone. Based on the quantity of experiments, this paper analyzes some factors that influence the ability of artificial ants and draws some conclusions about the law of ant perception.

  4. 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....

  5. 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......, the DHQs were accompanied by six histrionicotoxins (HTXs), viz., 283A, 285A, 285B, 285C, 287A, and 287D. This co-occurrence of the HTX and DHQ alkaloids is the usual pattern seen in dendrobatid frogs. This finding contrasts with our earlier study, where workers of a Brazilian ant, Solenopsis (Diplorhoptrum......) 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...

  6. 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.

  7. The worldwide expansion of the Argentine ant

    DEFF Research Database (Denmark)

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

    2010-01-01

    ) 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...

  8. Ant System Algorithm Research and Its Applications

    Institute of Scientific and Technical Information of China (English)

    2002-01-01

    In this paper, systematic review on Ant System (AS) algorithm research and application is made, and the authors works of introducing As algorithm into continuous space application are summarized. Then the applicability characters of AS in continuous space optimization problems are also discussed.

  9. Ant parasite queens revert to mating singly

    DEFF Research Database (Denmark)

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

    2004-01-01

    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 easi...

  10. 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...

  11. 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

    2009-07-01

    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.

  12. 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...

  13. Improving Emergency Management by Modeling Ant Colonies

    Science.gov (United States)

    2015-03-01

    brood. The brood stages include the egg, the larval, and the pupa.27 The brood is dependent on the colony for nourishment and warmth until fully...night for rest and to relocate the colony. The bivouac is what is created when army ants huddle together in a ball instead of building a physical nest

  14. Enhanced Pest Ant Control with Hydrophobic Bait

    Science.gov (United States)

    Ants occupy every ecological niche in the world where they contribute to the ecosystem, e.g., as scavengers and aerators of the soil. However, when they are transported, usually through human activities, to new locations they have powerful negative impacts on their adopted homeland. Five of the 17 l...

  15. Vestlus päevapoliitikast Ants Vahtrasega / Ants Vahtras ; interv. Hillar Padu

    Index Scriptorium Estoniae

    Vahtras, Ants, 1953-

    2001-01-01

    Keskerakonna Hiiumaa osakonna esimees Ants Vahtras keskendub vestluses Keskerakonna kandidaatidele presidendi valimistele, arutleb presidendile vajalike isikuomaduste, haldusreformi, Hiiumaa Suurkogu, erastamiselt laekuva raha kasutamise üle ning annab hinnangu kultuuripoliitikale. Autor: Keskerakond

  16. Nõunik Ants Laansalu - rohkem talupoeg kui sulane / Ants Laansalu ; interv. Heiki Raudla

    Index Scriptorium Estoniae

    Laansalu, Ants, 1938-2011

    2008-01-01

    Intervjuu põllumajandusministeeriumi nõunikuga, kes vastab küsimustele, mis puudutavad Eesti põllumajandusministreid, põllumehe mainet, põllumajanduse tulevikku Eestis ja maailmas. Vt. samas: Ants Laansalu: CV

  17. Ants ja Jaak / Ants Juske, Jaak Juske ; intervjueerinud Margit Tõnson, Maris Sander

    Index Scriptorium Estoniae

    Juske, Ants, 1956-

    2011-01-01

    Kunstiteadlane Ants Juske ja tema poliitikust poeg Jaak Juske räägivad põlvkondade erinevustest ja konfliktidest, oma poliitilisest identiteedist, haridusest, eeskujudest, huvidest, eluviisidest. Nende eluloolisi andmeid

  18. Ants Veetõusme ja tema valikud / Ants Veetõusme ; interv. Imbi E. Kaljuste

    Index Scriptorium Estoniae

    Veetõusme, Ants, 1949-

    2002-01-01

    Eesti Maksumaksjate Liidu juhatuse esimehe Ants Veetõusme varasemast elust ning praegusest tegevusest EML-i juhi, spordijuhi ja FIE-na. Kommenteerivad Tõnu Anton ja Tiit Nuudi. Tartu linnapea 1991-1993

  19. 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

  20. Mutualistic ants as an indirect defence against leaf pathogens.

    Science.gov (United States)

    González-Teuber, Marcia; Kaltenpoth, Martin; Boland, Wilhelm

    2014-04-01

    Mutualistic ants are commonly considered as an efficient indirect defence against herbivores. Nevertheless, their indirect protective role against plant pathogens has been scarcely investigated. We compared the protective role against pathogens of two different ant partners, a mutualistic and a parasitic ant, on the host plant Acacia hindsii (Fabaceae). The epiphytic bacterial community on leaves was evaluated in the presence and absence of both ant partners by cultivation and by 454 pyrosequencing of the 16S rRNA gene. Pathogen-inflicted leaf damage, epiphytic bacterial abundance (colony-forming units) and number of operational taxonomic units (OTUs) were significantly higher in plants inhabited by parasitic ants than in plants inhabited by mutualistic ants. Unifrac unweighted and weighted principal component analyses showed that the bacterial community composition on leaves changed significantly when mutualistic ants were removed from plants or when plants were inhabited by parasitic ants. Direct mechanisms provided by ant-associated bacteria would contribute to the protective role against pathogens. The results suggest that the indirect defence of mutualistic ants also covers the protection from bacterial plant pathogens. Our findings highlight the importance of considering bacterial partners in ant-plant defensive mutualisms, which can contribute significantly to ant-mediated protection from plant pathogens.

  1. Eavesdropping on cooperative communication within an ant-butterfly mutualism

    DEFF Research Database (Denmark)

    Elgar, Mark A.; Nash, David Richard; Pierce, Naomi E.

    2016-01-01

    of the Australian lycaenid butterfly, Jalmenus evagoras, form an obligate association with several species of attendant ants, including Iridomyrmex mayri. Ants protect the caterpillars and pupae, and in return are rewarded with nutritious secretions. Female and male adult butterflies use ants as signals...

  2. Can the Argentine ant ( Linepithema humile Mayr) replace native ants in myrmecochory?

    Science.gov (United States)

    Gómez, Crisanto; Oliveras, Jordi

    2003-04-01

    We analyse the influence of the Argentine ant ( Linepithema humile Mayr) on the seed dispersal process of the myrmecochorous plants Euphorbia characias, E. biumbellata, Genista linifolia, G. triflora, G. monspessulana and Sarothamnus arboreus. The observations were made in two study plots of Mediterranean cork-oak secondary forest (invaded and non-invaded by L. humile). The presence of L. humile implies the displacement of all native ant species that disperse seeds. Seed transports in the non-invaded zone were carried out by eight ant species. In the invaded zone, L. humile workers removed and transported seeds to the nest. In vertebrate exclusion trials, we observed the same level of seed removal in the invaded and non-invaded zones. Two findings could explain this result. Although mean time to seed localization was higher for native ants (431.7 s) than that for L. humile (150.5 s), the mean proportion of seeds transported after being detected was higher (50.1%) in non-invaded than in invaded (16.8%) zones. The proportion of seeds removed and transported into an ant nest after an ant-seed interaction had dramatically reduced from non-invaded (41.9%) to invaded (7.4%) zones. The levels of seed dispersal by ants found prior to invasion are unlikely to be maintained in invaded zones. However, total replacement of seed dispersal function is possible if contact iteration finally offers similar levels or quantities of seeds reaching the nests. The results obtained confirm that the Argentine ant invasion may affect myrmecochory dramatically in the Mediterranean biome.

  3. Ants mediate the structure of phytotelm communities in an ant-garden bromeliad

    OpenAIRE

    Céréghino, Régis; Leroy, Céline; Dejean,Alain; Corbara, Bruno

    2010-01-01

    International audience; The main theories explaining the biological diversity of rain forests often confer a limited understanding of the contribution of interspecific interactions to the observed patterns. We show how two-species mutualisms can affect much larger segments of the invertebrate community in tropical rain forests. Aechmea mertensii (Bromeliaceae) is both a phytotelm (plant-held water) and an ant-garden epiphyte. We studied the influence of its associated ant species (Pachycondyl...

  4. Parameters of ante-mortem delirium

    Directory of Open Access Journals (Sweden)

    Deksnyte, Aušra

    2014-02-01

    Full Text Available Objectives. The aim of this study was to investigate the parameters of ante-mortem delirium of the patients in a closed psychiatric institution and to compare them with the ante-mortem psychopathology of the medical patients. Methods. There were 139 medical records of the patients analyzed, who died during the period of 1997-2003 at the in-patient psychiatric institution. The diagnoses were recorded according to the International Classification of Diseases, 10th Revision (ICD-10 criteria. Patients’ data included age, gender, previous psychiatric disorders, current somatic and psychiatric morbidity, and comorbidity. Results. The incidence of delirium was 83,7%. The delirium group included more elder, male persons who were more likely to have dementia and less inclined to depression. Surprisingly the incidence of delirium among non-dementia men was quite high – 76,9%, as compared to non-dementia women – 23,1% (P=0,008. The duration of delirium differed from 1 to 1335 days. Longer delirium was observed among elder than 75 years (87,7, SD 183,9 vs52,6, SD 121,4 days; P=0,019 and dementia (83,6, SD 173,6 vs 13,5, SD 11,6 days; P<0,001 patients, but did not differ in gender groups. Conclusions. Ante-mortem delirium occurred more commonly in more elder and demented patients The duration of ante-mortem delirium was shorter in younger and non-dementia patients. Patients of the psychiatric institution tend to have longer deliriums than medical patients. The patients with depression and the history of alcohol abuse were not likely to get ante-mortem delirium. Before death in many persons hyperactive and mixed delirium transformed into hypoactive.

  5. La política de defensa de España ante la amenaza del terrorismo yihadista

    Directory of Open Access Journals (Sweden)

    Juan Antonio Moliner

    2015-06-01

    Full Text Available Se defiende la tesis de que el terrorismo yihadista, cuyo fin es la ordenación política de la sociedad sobre una interpretación fundamentalista del Islam, es una seria amenaza para España. Analizada y enfrentada como cualquier otra amenaza, ante ella no cabe sino defenderse. En ese análisis se parte de los conceptos, hoy en día estrechamente relacionados, de Seguridad y Defensa, se considera también el de política de Defensa y, tras describir la política de Defensa de España ante esa grave amenaza, se justifica la imperiosa necesidad de lograr el apoyo ciudadano para que cale en la sociedad su vital necesidad, la importancia de que esas políticas de Defensa, que protegen a la sociedad y sus intereses, requieren el esfuerzo adicional que implica el mantenerlas y sostenerlas adecuadamente.

  6. 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.

  7. Entre la beneficencia y la «familiaritas»: la contratación del «victum et vestitum» en los monasterios catalanes durante los siglos XI-XII. Una respuesta institucional alternativa ante el hambre como problema social

    Directory of Open Access Journals (Sweden)

    Benito i Monclús, Pere

    2004-06-01

    Full Text Available Since the end of the eleventh century, the great monastic institutions, including the majority of chapters of regular canons in Catalonia, have distributed alms as a daily food ratio to small groups of laypeople, who, not among the poor, were tied to these monasteries through the donation of allods or personal donation. The objective of this article is to demonstrate the relation which existed between this new type of contractual charity and the difficulties of a part of the society duringtimes of famine, as well as to show how these principal monastic institutions, as important lords, played a role in mitigating the effects of these famines on the dependent population between the end of the eleventh century and the first decennaries of the thirteenth century.

    Desde finales del siglo XI, en Cataluña, los principales monasterios y cabildos de canónigos regulares disponen de limosnas que ofrecen la ratio alimenticia diaria a pequeños grupos de laicos, diferenciados de los pobres, vinculados a ellas a través de actos de donación de alodios o de autodonación personal. En este artículo se aborda la relación entre el auge de este nuevo tipo de caridad contractual y de alguna de las formas de la familiaritas en las que derivó, y las dificultades de una parte de la sociedad durante las carestías, así como el papel que jugaron las principales instituciones monásticas, situadas al frente de importantes señoríos, a la hora de mitigar los efectos de éstas sobre la población dependiente.

  8. Dead ant walking: a myrmecophilous beetle predator uses parasitoid host location cues to selectively prey on parasitized ants.

    Science.gov (United States)

    Mathis, Kaitlyn A; Tsutsui, Neil D

    2016-08-17

    Myrmecophiles (i.e. organisms that associate with ants) use a variety of ecological niches and employ different strategies to survive encounters with ants. Because ants are typically excellent defenders, myrmecophiles may choose moments of weakness to take advantage of their ant associates. This hypothesis was studied in the rove beetle, Myrmedonota xipe, which associates with Azteca sericeasur ants in the presence of parasitoid flies. A combination of laboratory and field experiments show that M. xipe beetles selectively locate and prey upon parasitized ants. These parasitized ants are less aggressive towards beetles than healthy ants, allowing beetles to eat the parasitized ants alive without interruption. Moreover, behavioural assays and chemical analysis reveal that M. xipe are attracted to the ant's alarm pheromone, the same secretion used by the phorid fly parasitoids in host location. This strategy allows beetles access to an abundant but otherwise inaccessible resource, as A. sericeasur ants are typically highly aggressive. These results are the first, to our knowledge, to demonstrate a predator sharing cues with a parasitoid to gain access to an otherwise unavailable prey item. Furthermore, this work highlights the importance of studying ant-myrmecophile interactions beyond just their pairwise context.

  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 interac......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. Control de la posició i balanceig d’una bola sobre un pla emprant una plataforma Gough-Stewart

    OpenAIRE

    Bonet Muñoz, Albert

    2015-01-01

    El treball que es presenta a continuació consisteix en el plantejament, disseny i construcció d’un robot paral·lel amb 6 graus de llibertat del tipus Gough-Stewart per controlar, mitjançant un control PID, la posició d’una bola situada a sobre de la seva plataforma mòbil. La detecció de la bola s’ha realitzat mitjançant un sistema de visió, amb una càmera en posició zenital enfocant la part superior de la plataforma mòbil del robot. S’ha procurat assegurar una resposta ràpida, amb la màxima p...

  11. Los medios de comunicación de masas ante los cambios

    OpenAIRE

    Galán, Javier

    2013-01-01

    Título del video: Los medios de comunicación de masas ante los cambios socioeconómicos. Entrevista a Javier Galán . Disponible en: https://arcamm.uc3m.es/arcamm/?item=adc0e479f9571ae03dfdce02ad902b00 El sector de los medios de comunicación está inmerso en una profunda crisis. Los medios se enfrentan hoy al reto de encontrar estrategias de negocio que les permitan adaptarse a la nueva situación y continuar su tarea de responsabilidad social en el siglo XXI.

  12. ¿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)

  13. Calidad de vida relacionada con la salud y estrategias de afrontamiento ante el dolor en pacientes atendidos por una unidad de tratamiento del dolor Health-related quality of life and coping strategies with regard to pain, in patients attended in a unit of pain

    Directory of Open Access Journals (Sweden)

    F. Torre

    2008-03-01

    Full Text Available Introducción: La Organización Mundial de la Salud, define la calidad de vida como: "la percepción del individuo de su situación en la vida, dentro del contexto cultural y de valores en el que vive, y en relación con sus objetivos, expectativas, valores e intereses". Por lo tanto para una valoración completa de los beneficios producidos por un determinado tratamiento, es esencial medir su impacto en el estado de salud del paciente, lo que se denomina calidad de vida relacionada con la salud (CVRS. Objetivos: Describir las diferentes patologías de dolor crónico no maligno de los pacientes que acuden por primera vez a una unidad del dolor (UTD a lo largo de 6 meses y el tratamiento recibido. Conocer los cambios en la CVRS, intensidad del dolor, estrategias de afrontamiento y ansiedad/depresión al cabo de 6 meses de seguimiento de estos pacientes. Conocer la relación entre CVRS, afrontamiento, ansiedad/depresión e intensidad del dolor en estos pacientes. Conocer los cambios en las puntuaciones que miden los parámetros anteriores según los grupos diagnósticos. Material y métodos: Estudio descriptivo con medidas repetidas a los 6 meses respecto a la población de pacientes que acuden a la UTD del Hospital de Galdakao (Bizkaia durante el 2º semestre del 2005. Se administran varios cuestionarios, de calidad de vida (SF-36, de afrontamiento (CAD-R, ansiedad y depresión (HAD y la intensidad del dolor (EVA. Al cabo de 6 meses se vuelven a administrar y se recogen los diferentes tratamientos realizados en la UTD. Todos los procedimientos fueron realizados con el paquete estadístico SAS System v9.1, se asumió significación estadística cuando p Introduction: The World Health Organisation (WHO defines the quality of life (QOL as a subjective evaluation of the characteristics of a person life, a composite variable referring to an individual's subjective overall satisfaction with life, a multidimensional construct primarily based on a person

  14. 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.

  15. Insect navigation: do ants live in the now?

    Science.gov (United States)

    Graham, Paul; Mangan, Michael

    2015-03-01

    Visual navigation is a critical behaviour for many animals, and it has been particularly well studied in ants. Decades of ant navigation research have uncovered many ways in which efficient navigation can be implemented in small brains. For example, ants show us how visual information can drive navigation via procedural rather than map-like instructions. Two recent behavioural observations highlight interesting adaptive ways in which ants implement visual guidance. Firstly, it has been shown that the systematic nest searches of ants can be biased by recent experience of familiar scenes. Secondly, ants have been observed to show temporary periods of confusion when asked to repeat a route segment, even if that route segment is very familiar. Taken together, these results indicate that the navigational decisions of ants take into account their recent experiences as well as the currently perceived environment.

  16. 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.

  17. 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.

  18. 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

  19. Diagnóstico de mieloma múltiple a raíz de una lesión osteolítica mandibular

    Directory of Open Access Journals (Sweden)

    Marko Bellotti Mustecic

    2016-10-01

    Conclusiones: La presentación inicial del mieloma múltiple mediante una lesión mandibular es poco frecuente. Sin embargo, el cirujano maxilofacial debe sospechar una neoplasia de células plasmáticas ante imágenes radiolúcidas mandibulares y no demorar un estudio más exhaustivo.

  20. Kin-informative recognition cues in ants

    DEFF Research Database (Denmark)

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

    2011-01-01

    Although social groups are characterized by cooperation, they are also often the scene of conflict. In non-clonal systems, the reproductive interests of group members will differ and individuals may benefit by exploiting the cooperative efforts of other group members. However, such selfish...... 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...

  1. Ant Colony Optimization and Hypergraph Covering Problems

    CERN Document Server

    Pat, Ankit

    2011-01-01

    Ant Colony Optimization (ACO) is a very popular metaheuristic for solving computationally hard combinatorial optimization problems. Runtime analysis of ACO with respect to various pseudo-boolean functions and different graph based combinatorial optimization problems has been taken up in recent years. In this paper, we investigate the runtime behavior of an MMAS*(Max-Min Ant System) ACO algorithm on some well known hypergraph covering problems that are NP-Hard. In particular, we have addressed the Minimum Edge Cover problem, the Minimum Vertex Cover problem and the Maximum Weak- Independent Set problem. The influence of pheromone values and heuristic information on the running time is analysed. The results indicate that the heuristic information has greater impact towards improving the expected optimization time as compared to pheromone values. For certain instances of hypergraphs, we show that the MMAS* algorithm gives a constant order expected optimization time when the dominance of heuristic information is ...

  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 o...... 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.......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. Discrimination Behavior in the Supercolonial Pharaoh Ant

    DEFF Research Database (Denmark)

    Pontieri, Luigi

    ones and that low genetically diverse colonies discriminated high diverse non-nestmates better than vice versa. In the second chapter I investigated whether the high genetic differentiation characterizing natural colonies of pharaoh ants is sufficient to prevent unrelated colonies to fuse and how...... compiled datasets of cuticular hydrocarbons (CHCs) and aggression between colonies of three species of ants (Formica exsecta, Camponotus aethiops and Monomorium pharaonis) and a simulated dataset. Then, using the available information about the exact cues used for nestmate recognition in F. exsecta, we...... 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...

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

    Science.gov (United States)

    Stuble, Katharine L; Kirkman, L Katherine; Carroll, C Ronald; Sanders, Nathan J

    2011-06-01

    The degree to which changes in community composition mediate the probability of colonization and spread of non-native species is not well understood, especially in animal communities. High species richness may hinder the establishment of non-native species. Distinguishing between this scenario 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 and fire ants in four experimental plots. We then observed the reassembly and reestablishment of the ants in these plots for 1 year after treatment. The abundance of fire ants in treated plots did not differ from abundance in control plots 1 year after treatment. Likewise, 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 and fire ants to disturbance can be comparable.

  5. 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

  6. Polyethism in a colony of artificial ants

    CERN Document Server

    Marriott, Chris

    2011-01-01

    We explore self-organizing strategies for role assignment in a foraging task carried out by a colony of artificial agents. Our strategies are inspired by various mechanisms of division of labor (polyethism) observed in eusocial insects like ants, termites, or bees. Specifically we instantiate models of caste polyethism and age or temporal polyethism to evaluated the benefits to foraging in a dynamic environment. Our experiment is directly related to the exploration/exploitation trade of in machine learning.

  7. Ant foraging on extrafloral nectaries of Qualea grandiflora (Vochysiaceae) in cerrado vegetation: ants as potential antiherbivore agents.

    Science.gov (United States)

    Oliveira, P S; da Silva, A F; Martins, A B

    1987-12-01

    Qualea grandiflora is a typical tree of Brazilian cerrados (savanna-like vegetation) that bears paired extrafloral nectaries (EFNs) along its stems. Results show that possession of EFNs increases ant density on Q. grandiflora shrubs over that of neighbouring non-nectariferous plants. Frequency of ant occupancy and mean number of ants per plant were much higher on Qualea than on plants lacking EFNs. These differences resulted in many more live termitebaits being attacked by foraging ants on Qualea than on neighbours without EFNs. Termites were attacked in equal numbers and with equal speeds on different-aged leaves of Qualea. The greatest potential for herbivore deterrence was presented by Camponotus ants (C. crassus, C. rufipes and C. aff. blandus), which together attacked significantly more termites than nine other ant species grouped. EFNs are regarded as important promoters of ant activity on cerado plants.

  8. A plant needs ants like a dog needs fleas: Myrmelachista schumanni ants gall many tree species to create housing.

    Science.gov (United States)

    Edwards, David P; Frederickson, Megan E; Shepard, Glenn H; Yu, Douglas W

    2009-11-01

    Hundreds of tropical plant species house ant colonies in specialized chambers called domatia. When, in 1873, Richard Spruce likened plant-ants to fleas and asserted that domatia are ant-created galls, he incited a debate that lasted almost a century. Although we now know that domatia are not galls and that most ant-plant interactions are mutualisms and not parasitisms, we revisit Spruce's suggestion that ants can gall in light of our observations of the plant-ant Myrmelachista schumanni, which creates clearings in the Amazonian rain forest called "supay-chakras," or "devil's gardens." We observed swollen scars on the trunks of nonmyrmecophytic canopy trees surrounding supay-chakras, and within these swellings, we found networks of cavities inhabited by M. schumanni. Here, we summarize the evidence supporting the hypothesis that M. schumanni ants make these galls, and we hypothesize that the adaptive benefit of galling is to increase the amount of nesting space available to M. schumanni colonies.

  9. 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.

  10. Cuatro: un caso de estudio de eficacia en la creación de una marca televisiva

    OpenAIRE

    Gónzalez, Cristina

    2006-01-01

    Dotzenes Jornades de Foment de la Investigació de la FCHS (Any 2006-2007) En los últimos años se ha podido detectar y visualizar por parte de las cadenas de televisión, una aceleración en el uso de su comunicación corporativa. El objetivo de destacar ante la competencia y posicionarse ante la audiencia mediante el desarrollo de pautas comunicativas para crear marca televisiva, son algunos de los aspectos causantes de esta nueva modalidad del panorama televisivo español. Una de ...

  11. How load-carrying ants avoid falling over: mechanical stability during foraging in Atta vollenweideri grass-cutting ants.

    Directory of Open Access Journals (Sweden)

    Karin Moll

    Full Text Available BACKGROUND: Foraging workers of grass-cutting ants (Atta vollenweideri regularly carry grass fragments larger than their own body. Fragment length has been shown to influence the ants' running speed and thereby the colony's food intake rate. We investigated whether and how grass-cutting ants maintain stability when carrying fragments of two different lengths but identical mass. PRINCIPAL FINDINGS: Ants carried all fragments in an upright, backwards-tilted position, but held long fragments more vertically than short ones. All carrying ants used an alternating tripod gait, where mechanical stability was increased by overlapping stance phases of consecutive steps. The overlap was greatest for ants carrying long fragments, resulting in more legs contacting the ground simultaneously. For all ants, the projection of the total centre of mass (ant and fragment was often outside the supporting tripod, i.e. the three feet that would be in stance for a non-overlapping tripod gait. Stability was only achieved through additional legs in ground contact. Tripod stability (quantified as the minimum distance of the centre of mass to the edge of the supporting tripod was significantly smaller for ants with long fragments. Here, tripod stability was lowest at the beginning of each step, when the center of mass was near the posterior margin of the supporting tripod. By contrast, tripod stability was lowest at the end of each step for ants carrying short fragments. Consistently, ants with long fragments mainly fell backwards, whereas ants carrying short fragments mainly fell forwards or to the side. Assuming that transporting ants adjust neither the fragment angle nor the gait, they would be less stable and more likely to fall over. CONCLUSIONS: In grass-cutting ants, the need to maintain static stability when carrying long grass fragments has led to multiple kinematic adjustments at the expense of a reduced material transport rate.

  12. En busca de una vacuna anti-malárica

    Directory of Open Access Journals (Sweden)

    Edith Suzarte Portal

    2009-01-01

    Full Text Available El desarrollo e implementación de una vacuna contra la malaria representa una necesidad médica urgente para la población que habita las regiones donde ella es endémica. En los últimos años, se han visto progresos significativos en el desarrollo de vacunas, con numerosos candidatos iniciando evaluación en ensayos clínicos. A pesar del optimismo y algunos resultados prometedores, hasta el momento no se cuenta con una vacuna efectiva, en parte, por la falta de conocimiento del tipo de respuesta inmune necesaria para la protección. A esto, se adiciona la dificultad de identificar, seleccionar y producir los antígenos protectores del parásito que posee más de 5 000 genes y un ciclo de vida complejo. Por otra parte, el gran polimorfismo de los antígenos de Plasmodium y los diferentes mecanismos que utiliza para evadir la respuesta inmune hacen necesario aumentar la inmunogenicidad de los antígenos purificados, a través del uso de nuevos adyuvantes o sistemas de liberación. El reto no es meramente científico, se necesita involucrar investigadores competentes, lograr colaboración entre academias, industrias y agencias financiadoras y comprometimiento político. Actualmente, se ensayan diferentes estrategias dirigidas hacia los distintos estadios del parásito. En este manuscrito se destacan algunas de las más avanzadas, otras aún en fase preclínica y algunos fracasos, todas dirigidas contra P. falciparum, así como los principales retos a vencer en la búsqueda de una vacuna anti-malárica efectiva.

  13. 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.

  14. La ladrona de libros : Reseña de una película de Brian Percivel sobre un libro de Markus Zusak, USA - Alemania, 20th Century Fox, 2013

    OpenAIRE

    Urtasun, Carolina

    2014-01-01

    “La ladrona de libros”, película de Brian Percivel basada en una novela de Zusak, cuenta la historia de una niña alemana, Liesel, a quien sus padres dejan en adopción antes de huir de la Alemania nazi tiempo antes de la Segunda Guerra Mundial. Liesel es acogida por una pareja de mediana edad, con la que aprende a convivir y a leer. El primer día de clases en la escuela sus compañeros se burlan de ella porque, en lugar de su nombre, escribe apenas unas grandes cruces en el pizarrón. Sin emb...

  15. 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 d e 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 manifiest a 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 in vestigación; 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 ident ifican 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.

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

    DEFF Research Database (Denmark)

    Offenberg, Hans Joachim

    2011-01-01

    Canopy dwelling weaver ants are widely distributed throughout the Old World Tropics where they build up high densities on their host trees. If managed properly the high number of ants will control a range of pest insects and benefit crop production. Simultaneously the ant larvae production, fuell...... be sustainable combined with their use in biocontrol, (ii) estimates of ant harvest yields from a mango plantation and (iii) how active feeding of ants may generate economic returns between 1.52 and 4.56 in a Thai market....... into a valuable and needed source of protein. Protein from conventional livestock production leave a high pressure on the environment as the food and farm area needed to produce each protein unit is high. For insect production these requirements are much lower and FAO has recently proposed research in insect...... 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...

  17. 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.

  18. El pediatra ante la discapacidad de niños y adolescentes

    Directory of Open Access Journals (Sweden)

    Karla Adney Flores Arizmendi

    2016-09-01

    Full Text Available Los niños son el grupo social más vulnerable y los que tienen discapacidad se encuentran con una doble desventaja: la de ser niños y la de tener una discapacidad. En la mayoría de las ocasiones, el pediatra es el primer contacto de salud de las personas con discapacidad. En nuestra formación profesional no se ha incluido el tema discapacidad como un problema social y sanitario prevalente, por lo que en la mayoría de los casos nos enfrentamos ante un panorama totalmente desconocido.

  19. 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.

  20. El museo ante un cambio de paradigma. Del tipo al logotipo

    OpenAIRE

    2014-01-01

    En esta Tesis expongo una reflexión sobre cómo la pérdida de valores ante un cambio de paradigma social ha derivado en la disolución de la tipología de Museo generando un “Museo Contemporáneo” , mediante el estudio sistemático de la obra de los autores más significativos del siglo XX, que, frente al Museo Moderno, es un museo global, que no pertenece a ningún lugar concreto, un museo del desarraigo, desligado incluso de su función. Su origen conceptual basado en una idea “social” participativ...

  1. Expectativas de los estudiantes ante la asignatura de historia de la psicología

    Directory of Open Access Journals (Sweden)

    María Dolores García Sánchez

    2008-01-01

    Full Text Available El presente estudio parte de la importancia de conocer las expectativas, conocimientos previos, motivaciones y actitudes de los estudiantes ante la asignatura de Historia de la Psicología, a fin de que el docente pueda conducir el curso de forma óptima. Se realizó la adaptación de un cuestionario y se aplicó a una muestra de 270 sujetos que cursarían la asignatura en el primer semestre de la licenciatura en Psicología de una universidad pública. Los resultados indican la confusión de los estudiantes sobre sus expectativas y lo que específicamente puede brindarles la asignatura mencionada.

  2. en una muestra de escuelas primarias

    Directory of Open Access Journals (Sweden)

    Teresa de Jesús Mazadiego Infante

    2005-01-01

    Full Text Available El objetivo del presente estudio fue detectar maltrato infantil en el hogar y en la escuela. Participaron 550 niños de siete a doce años de edad, alumnos de primero a sexto grado en siete diferentes escuelas, tanto de un ambiente rural como urbano, seleccionados al azar. El instrumento constó de ocho reactivos de selección. La principal variable encontrada fue el cuidado excesivo por un familiar. Entre las implicaciones que se desprenden se hallan la carencia de una cultura de protección hacia los niños, la necesidad de educar a los padres para di-ferenciar disciplina de maltrato y de presentar propuestas ante las instancias educativas pertinentes.

  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. Adaptación y estudio descriptivo del experimento Simon en una muestra de estudiantes ecuatorianos

    OpenAIRE

    Ramos Galarza, Carlos Alberto; Guevara Vega, María Eulalia; Bolaños Pasquel, Mónica; Ramos Galarza, David

    2015-01-01

    Introducción. El experimento Simon es una tarea que permite evaluar el control inhibitorio y tiempo de reacción ante un estímulo que genera una tendencia automática de respuesta en el ser humano. Actualmente no existe investigación alguna que haya buscado adaptar este experimento en el contexto ecuatoriano. Objetivo. Adaptar y realizar un estudio descriptivo y correlacional del experimento Simon en una muestra de estudiantes ecuatorianos. Materiales y Método. La muestra estuvo conformad...

  5. Desarrollo de un empaque polimérico con propiedades antiempañantes apropiado para la comercialización de Gulupa (passiflora edulis Sims fo. edulis)

    OpenAIRE

    Gutiérrez Carranza, Luis Alejandro

    2010-01-01

    En la búsqueda de un empaque con óptimas propiedades anti-empañantes se seleccionó como matriz polimérica polietileno de baja densidad (LDPE) y se incorporaron por medio de una extrusión los aditivos: polisorbato 80, oleato de sorbitán, monooleato de glicerol y mezcla de glicéridos. Cada uno en 3 concentraciones, dando como resultado 12 formulaciones diferentes y un blanco correspondiente de LDPE. Para evaluar la eficiencia anti-empañante de los empaques se realizaron medidas de tensión super...

  6. Diferencias sociodemográficas y protección ante el consumo de drogas legales

    Directory of Open Access Journals (Sweden)

    José Miguel Martínez González

    2003-01-01

    Full Text Available El objetivo de este estudio fue comprobar si la edad de personas jóvenes potencialmente consumidoras de alcohol y tabaco, la situación laboral de los padres de aquellas, el hecho de que éstos estén separados o no y el número de hermanos de aquellos podría influir en el nivel de protección ante el consumo de las sustancias descritas. Se utilizó una metodología cuasi-experimental con diseños de grupos no aleatorios, aplicando para el análisis estadístico de los datos la prueba “t-Student”. La muestra estuvo compuesta de 534 personas, con edades comprendidas entre los 14 y 21 años de edad, todos estudiantes de Enseñanzas Secundarias Obligatoria y Bachillerato. Los resultados mostraron que algunas variables protectoras para el consumo habitual de alcohol y/o fumar tabaco tenían una presencia en la población estudiada diferente, dependiendo de la edad, del hecho de que trabaje uno o los dos progenitores y la posible situación de separación de los padres. En otras palabras, este estudio muestra diferencias sociodemográficas en protección ante el consumo de drogas legales.

  7. Vivencia de las enfermeras ante los cuidados en el proceso de muerte

    Directory of Open Access Journals (Sweden)

    Elaine Guedes Fontoura

    2013-06-01

    Full Text Available El objetivo de este estudio es comprender como las enfermeras vivencian el cuidado a la persona en el proceso de morir. Método: estudio fenomenológico con catorce enfermeras de la unidad de pacientes de larga duración y de la clínica médica de un hospital general, a través de entrevista fenomenológica, posterior aprobación por el Comité de Ética en Investigación. El análisis fenomenológico pasó por las etapas de descripción, reducción y comprensión. Resultados: fueron desvelados el sufrimiento ante de la muerte en el cotidiano laboral, la muerte como una experiencia inolvidable, y el vacío existencial ante de la muerte. Conclusión: Las enfermeras mostraron ansiedad, miedo y la muerte como una experiencia inolvidable, revelando la difícil aceptación y el vacío existencial.

  8. 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.

  9. La segunda pantalla televisiva: la aplicación Ant 3.0 de Antena 3

    Directory of Open Access Journals (Sweden)

    Mónica Barrientos Bueno

    2013-09-01

    Full Text Available Dentro del nuevo modelo comunicativo caracterizado por la convergencia multimedia, las aplicaciones de segunda pantalla televisiva para dispositivos móviles están conociendo un lento crecimiento en España. La de mayor implantación y alcance actualmente es Ant 3.0, de ahí su interés como objeto de análisis.  Por ello este artículo propone conocer el funcionamiento y principales servicios que ofrece la primera aplicación de contenido sincrónica en España desde la praxis, previo acercamiento al concepto de actividad de segunda pantalla. Por ello el trabajo de campo ha supuesto seguir una sesión de segunda pantalla, para lo cual se ha escogido la emisión de un capítulo de la serie Gran Hotel. Como resultado, Ant 3.0 queda definida como una experiencia de segunda pantalla completa de contenido interactivo que fideliza al espectador y le hace partícipe, en este caso, de la resolución de los misterios de la trama. 

  10. DEGRADACIÓN DE SUELOS ANTE TENSION DE CORTE CÍCLICA

    Directory of Open Access Journals (Sweden)

    Rubén Ángel Galindo-Aires

    2013-07-01

    Full Text Available Un suelo sometido a carga tangencial repetida se comporta de diferente manera al principio de la solicitación que después de un número de ciclos de carga. La respuesta del suelo es cada vez menos rígida, adquiriendo más deformación ante la misma solicitación, esto es debido al fenómeno de degradación de la estructura del suelo producido por la actuación de una carga continua en el tiempo. Ésta, por sí sola, no es capaz de alterar la disposición de las partículas de suelo, pero al repetirse regularmente implica su actuación en cada nuevo ciclo de carga sobre un suelo ya solicitado al mismo esfuerzo, durante un corto espacio de tiempo antes y que, por tanto, o no ha recuperado aún su posicionamiento inicial o ha producido una pequeña alteración en la estructura del suelo que la diferencia de la situación anterior. La generación de presión en el agua intersticial de un suelo saturado al aplicar tensión de corte predispone al suelo a un comportamiento diferente ante nuevas situaciones de carga y constituye así el principal factor causante del fenómeno de degradación de un suelo blando. En este artículo se estudia el fenómeno de degradación y se proponen dependencias con las variables que intervienen en el problema.

  11. 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.

  12. Parallelizing Ant Colony Optimization via Area of Expertise Learning

    Science.gov (United States)

    2007-09-13

    lutions for all but the most trivial instances. Ant colony optimization (ACO) is a simple metaheuristic that can effectively solve problems in these...expertise” technique is applied to two problem domains: gridworld and the traveling salesman problem. 1.1 Motivation ACO is a metaheuristic that generates...independent ant agents, an obvious extension of the ant colony framework is to implement the algorithm in a parallel environment. One of the main

  13. Rhabdomyolysis and Acute Renal Failure After Fire Ant Bites

    OpenAIRE

    Koya, Supriya; Crenshaw, Daryl; Agarwal, Anupam

    2007-01-01

    We describe a 59-year-old patient who developed acute renal failure because of rhabdomyolysis after extensive red fire ant bites. This case illustrates a serious systemic reaction that may occur from fire ant bites. Consistent with the clinical presentation in rhabdomyolysis associated with non-traumatic causes, hyperkalemia, hypophosphatemia, hypocalcemia, and high anion gap acidosis were not observed in this patient. While local allergic reactions to fire ant bites are described in the lite...

  14. 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.

  15. Does Trichomes on the Plant Epidermic Surface Disturb Ants Locomotion?

    OpenAIRE

    Danon C. Cardoso; Maykon P Cristiano; Lenise C. M. Vilela; Tiago D. A. Martins

    2009-01-01

    Problem Statement: Many morphological characteristics, both physical and chemical, are used in the defense against herbivores on plants. Trichomes are structures used by plants as physics defense and when associated with glands combine physics and chemistry defense. Many species of ants are herbivores and use leaves and seeds, others ants use Extra Floral Nectars as a food resource, and the majority of the species are predators of other ants and other insects, &#...

  16. Evolutionarily advanced ant farmers rear polyploid fungal crops

    OpenAIRE

    Pepijn W Kooij; Aanen, D. K.; Schiøtt, M.; Boomsma, Jacobus J.

    2015-01-01

    Abstract Innovative evolutionary developments are often related to gene or genome duplications. The crop fungi of attine fungus‐growing ants are suspected to have enhanced genetic variation reminiscent of polyploidy, but this has never been quantified with cytological data and genetic markers. We estimated the number of nuclei per fungal cell for 42 symbionts reared by 14 species of Panamanian fungus‐growing ants. This showed that domesticated symbionts of higher attine ants are polykaryotic ...

  17. 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.

  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. [Ants: a chemical library of anticancer molecules].

    Science.gov (United States)

    Vétillard, Angélique; Bouzid, Wafa

    2016-01-01

    Animal venoms are complex mixtures containing simple organic molecules, proteins, peptides, and other bioactive elements with extraordinary biological properties associated with their ability to act on a number of molecular receptors in the process of incapacitating their target organisms. In such a context, arthropod venoms are invaluable sources of bioactive substances, with therapeutic interest but the limited availability of some venom such as those from ants, has restricted the potential that these biomolecules could represent. We investigated for the first time transcriptomic expression from the ant species Tetramorium bicarinatum. Four hundred randomly selected clones from cDNA libraries were sequenced and a total of 374 expressed sequence tags (ESTs) were generated. Based on the results of BLAST searches, these sequences were clustered and assembled into 269 contigs. About 72% (269) of these matched BLASTx hits with an interesting diversity and unusual abundance of cellular transcripts (48%) related to gene and protein expression reflecting the specialization of this tissue. In addition, transcripts encoding transposases were relatively highly expressed (14%). It may be that transposable elements are present and that their presence accounts for some of the variation in venom toxins. About twenty per cent of the ESTs were categorized as putative toxins, the major part represented by allergens (48% of the total venom toxins) such as pilosulin 5, sol i 3 and Myp p I and II. Several contigs encoding enzymes, including zinc-metalloproteases (17%) that are likely involved in the processing and activation of venom proteins/peptides, were also identified from the library. In addition, a number of sequences (8%) had no significant similarity to any known sequence which indicates a potential source of for the discovery of new toxins. In order to provide a global insight on the transcripts expressed in the venom gland of the Brazilian ant species Tetramorium

  20. 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.

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

    OpenAIRE

    Laura María González Ortíz

    2014-01-01

    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, a...

  2. 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.

  3. Variation of ant community structure on Ficus benguetensis

    Directory of Open Access Journals (Sweden)

    Shang-Yang Lin

    2016-03-01

    Full Text Available Although ants are commonly found on Ficus trees, information remains lacking on the pattern and diversity of the ant community visiting these trees. We hypothesize that dynamic changes in the availability and types of food can affect the composition as well as abundance of ant communities occurring on fig trees. To investigate the impact of resource availability, diversity, and variability on the ant community structure, we surveyed and recorded the fig phenology and ant abundance on 17 trees (11 male and six female trees of Ficus benguetensis in New Taipei City in northern Taiwan from 2011 to 2013. A total of 13 ant species were found on these fig trees, with 6 species more abundant than the others. The composition and relative abundance of the ant species occurring on F. benguetensis trees showed significant variations associated with tree sex, fig abundance, fig developmental phase, as well as temperature. A degree of dietary niche partitioning was also observed. We suggest that sexual differentiation in fig phenology plays a major role in controlling the availability and variance in food resources for ants, thereby shaping the complex ant communities foraging on F. benguetensis.

  4. Improvement and Implementation of Best-worst Ant Colony Algorithm

    Directory of Open Access Journals (Sweden)

    Xianmin Wei

    2013-05-01

    Full Text Available In this study, we introduced the ant colony algorithm of best-worst ant system based on the pheromone update. By update improvements of local pheromone and global pheromone, as well as the optimal solution enhancement to a greater extent and the weakening of the worst solution, the algorithm further increased the difference of pheromone amount between the edge of the optimal path and the edge of the worst path and allowed the ant colony search behavior more focused near the optimal solution. Finally, through simulation experiments to prove that the algorithm can get the optimal solution and the convergence rate is faster than the average ant colony algorithm.

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

    Science.gov (United States)

    Turner, Kyle M; Frederickson, Megan E

    2013-01-01

    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.

  6. Five new records of ants (Hymenoptera: Formicidae) for Nebraska

    Science.gov (United States)

    Nemec, Kristine T.; Trager, James C.; Manley, Elizabeth; Allen, Craig R.

    2012-01-01

    Ants are ubiquitous and influential organisms in terrestrial ecosystems. About 1,000 ant species occur in North America, where they are found in nearly every habitat (Fisher and Cover 2007). Ants are critical to ecological processes and structure. Ants affect soils via tunneling activity (Baxter and Hole 1967), disperse plant seeds (Lengyel et al. 2009), prey upon a variety of insects and other invertebrates (Way and Khoo 1992, Folgarait 1998), are often effective primary consumers through their prodigious consumption of floral and especially extrafloral nectar, and honeydew (Tobin 1994), and serve as prey for invertebrates (Gotelli 1996, Gastreich 1999) and vertebrates (Reiss 2001).

  7. Looking and homing: how displaced ants decide where to go.

    Science.gov (United States)

    Zeil, Jochen; Narendra, Ajay; Stürzl, Wolfgang

    2014-01-01

    We caught solitary foragers of the Australian Jack Jumper ant, Myrmecia croslandi, and released them in three compass directions at distances of 10 and 15 m from the nest at locations they have never been before. We recorded the head orientation and the movements of ants within a radius of 20 cm from the release point and, in some cases, tracked their subsequent paths with a differential GPS. We find that upon surfacing from their transport vials onto a release platform, most ants move into the home direction after looking around briefly. The ants use a systematic scanning procedure, consisting of saccadic head and body rotations that sweep gaze across the scene with an average angular velocity of 90° s(-1) and intermittent changes in turning direction. By mapping the ants' gaze directions onto the local panorama, we find that neither the ants' gaze nor their decisions to change turning direction are clearly associated with salient or significant features in the scene. Instead, the ants look most frequently in the home direction and start walking fast when doing so. Displaced ants can thus identify home direction with little translation, but exclusively through rotational scanning. We discuss the navigational information content of the ants' habitat and how the insects' behaviour informs us about how they may acquire and retrieve that information.

  8. 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.

  9. What is the effect of soil use on ant communities?

    Science.gov (United States)

    Schmidt, Fernando A; Diehl, Elena

    2008-01-01

    Studies on ant communities in agroecosystems have contributed to the knowledge of the effect of agricultural activities on biological communities. The aim of this study is to explain the effect of soil use on ant communities. We tested the hypothesis that there was a decrease in ant species richness and a change in the species composition at habitats with more intense soil use. We collected ants using sardine baits, subterranean traps and direct sampling at four habitats with different soil use (secundary forest, Acacia forestry, initial stage of succession and mixed crops). The ant species richness did not decrease with intensity of soil use. In successional habitat the species numbers collected using sardine baits and subterranean traps were significantly different. Species composition of communities had a pronounced variation, with the epigaeic and hypogaeic ant faunas of the habitat with high intense soil use (mixed crops) had low similarity with ant communities of the three other habitats. The predator species were restricted to habitats with low intensity of soil use. Then, species composition could better reflect the functional changes on ant communities than species richness. Our data can help to choose the component of ant community that better reflect the response of biodiversity to agricultural impacts.

  10. Ant-Crypto, a Cryptographer for Data Encryption Standard

    Directory of Open Access Journals (Sweden)

    Salabat Khan

    2013-01-01

    Full Text Available Swarm Intelligence and Evolutionary Techniques are attracting the cryptanalysts in the field of cryptography. This paper presents a novel swarm based attack called Ant-Crypto (Ant-Cryptographer for the cryptanalysis of Data Encryption Standard (DES. Ant-Crypto is based on Binary Ant Colony Optimization (BACO i.e. a binary search space based directed graph is modeled for efficiently searching the optimum result (an original encryption key, in our case. The reason that why evolutionary techniques are becoming attractive is because of the inapplicability of traditional techniques and brute force attacks against feistel ciphers due to their inherent structure based on high nonlinearity and low autocorrelation. Ant-Crypto uses a known-plaintext attack to recover the secret key of DES which is required to break/ decipher the secret messages. Ant-Crypto iteratively searches for the secret key while generating several candidate optimum keys that are guessed across different runs on the basis of routes completed by ants. These optimum keys are then used to find each individual bit of the 56 bit secret key used during encryption by DES. Ant-Crypto is compared with some other state of the art evolutionary based attacks i.e. Genetic Algorithm and Comprehensive Binary Particle Swarm Optimization. The experimental results show that Ant-Crypto is an effective evolutionary attack against DES and can deduce large number of valuable bits as compared to other evolutionary algorithms; both in terms of time and space complexity.

  11. Salud mental ante las crisis y desastres

    OpenAIRE

    2016-01-01

    La Salud Mental es un componente nuclear del bienestar personal y colectivo, es un concepto que aunque parcial de la salud general constituye el único camino probablemente para acercarse a la felicidad y la paz que todos los seres humanos (salvo excepciones) buscamos. Y las crisis y los desastres son eventos más allá de lo esperable que sobrepasa las defensas del ser humano y ante el que hay que enfrentarse con rapidez, eficacia, orden, multiprofesionalmente pero sobre todo con calma int...

  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. Ants Laaneots : palgaarmeele üleminek pole praegu aktuaalne / Ants Laaneots ; interv. Peeter Kuimet

    Index Scriptorium Estoniae

    Laaneots, Ants, 1948-

    2006-01-01

    Ilmunud ka: Postimees : na russkom jazõke 6. dets. lk. 2. Kaitseväe uus juhataja kindralmajor Ants Laaneots vastab küsimustele kaitseväe ja ajateenistuse probleemide kohta. Lisa: Eesti kaitseväe juhatajad 1993-2006. Vt. samas: Laaneotsalt oodatakse sisetülide lahendamist

  14. Ants Laaneots : Peame venelaste provokatsiooniks valmis olema / Ants Laaneots ; interv. Urmo Soonvald

    Index Scriptorium Estoniae

    Laaneots, Ants, 1948-

    2002-01-01

    Ilmunud ka: Den za Dnjom 13. september lk. 9. Kindralmajor Ants Laaneots vastab küsimustele, kui reaalne on tulevikus Eesti pinnal sõja puhkemise oht, 11. septembri sündmuste kohta USA-s, Eesti NATO liikmeks kutsumise, provokatsioonide vastu valmisoleku, võõrriigi oletatava Eestisse sissetungi kohta

  15. 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.

  16. 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

    The degree to which changes in community composition mediate the probability of colonization and spread of non-native species is not well understood, especially in animal communities. High species richness may hinder the establishment of non-native species. Distinguishing between this scenario...... the abundance of native ants and fire ants in four experimental plots. We then observed the reassembly and reestablishment of the ants in these plots for 1 year after treatment. The abundance of fire ants in treated plots did not differ from abundance in control plots 1 year after treatment. Likewise...

  17. Evaluación de riesgos sobre la reparación de una bomba de refinería petrolífera

    OpenAIRE

    Rión-Vallés, Jordi

    2014-01-01

    El trabajo parte de la hipótesis de una reparación real de una bomba centrífuga en una refinería de petróleo. A partir de este hecho se realiza una evaluación general de riesgos para la seguridad y salud de aquellos trabajadores que se ven involucrados directamente con las diferentes tareas que abarca el proceso de reparación. Nos encontramos ante una empresa con gran interés para garantizar la seguridad de los trabajadores, pero aun así, todavía queda mucho por hacer. Por este motivo, la ...

  18. 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.

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

    OpenAIRE

    Patricio Hales Dib

    2013-01-01

    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".

  20. 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".

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

    Science.gov (United States)

    Horn, Katherine C; Eubanks, Micky D; Siemann, Evan

    2013-01-01

    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.

  2. Eggs of Mallada desjardinsi (Neuroptera: Chrysopidae) are protected by ants: the role of egg stalks in ant-tended aphid colonies.

    Science.gov (United States)

    Hayashi, Masayuki; Nomura, Masashi

    2014-08-01

    In ant-aphid mutualisms, ants usually attack and exclude enemies of aphids. However, larvae of the green lacewing Mallada desjardinsi (Navas) prey on ant-tended aphids without being excluded by ants; these larvae protect themselves from ants by carrying aphid carcasses on their backs. Eggs of M. desjardinsi laid at the tips of stalks have also been observed in ant-tended aphid colonies in the field. Here, we examined whether the egg stalks of M. desjardinsi protect the eggs from ants and predators. When exposed to ants, almost all eggs with intact stalks were untouched, whereas 50-80% of eggs in which stalks had been severed at their bases were destroyed by ants. In contrast, most eggs were preyed upon by larvae of the lacewing Chrysoperla nipponensis (Okamoto), an intraguild predator of M. desjardinsi, regardless of whether their stalks had been severed. These findings suggest that egg stalks provide protection from ants but not from C. nipponensis larvae. To test whether M. desjardinsi eggs are protected from predators by aphid-tending ants, we introduced C. nipponensis larvae onto plants colonized by ant-tended aphids. A significantly greater number of eggs survived in the presence of ants because aphid-tending ants excluded larvae of C. nipponensis. This finding indicates that M. desjardinsi eggs are indirectly protected from predators by ants in ant-tended aphid colonies.

  3. Antecedentes y consecuencias de la actitud ante el anuncio en las personas mayores. Un análisis empírico

    Directory of Open Access Journals (Sweden)

    Marta Estrada

    2010-08-01

    Full Text Available La importancia socioeconómica adquirida en los últimos años en España y en otros países europeos por el emergente mercado de las personas mayores hace necesario el estudio de sus particularidades como consumidores. Los cambios operados durante el proceso del envejecimiento ejercen una influencia en la percepción del fenómeno publicitario y, por ende, en la actitud manifestada ante el anuncio. El estudio en las personas mayores de los antecedentes de la actitud ante el anuncio y sus consecuencias en el contexto del modelo de mediación dual es el propósito del análisis de este estudio. Se describirá cómo se producen los mismos y se demostrá la validez del modelo de mediación dual como explicativo de las respuestas otorgadas por las personas mayores ante la publicidad.

  4. una experiencia clínica

    Directory of Open Access Journals (Sweden)

    Aída Liliana Villamil González

    2007-01-01

    Full Text Available El propósito del estudio fue aplicar la escala de valoración de la intensidad de dolor de Susan Givens Bell en la UCI Neonatal. Se valoró laintensidad del dolor de 47 neonatos de la Unidad Neonatal de la Fundación Cardio Infantil, sometidos a punciones arteriovenosas y de talónutilizando la escala antes y después de los procedimientos. La información se procesó por medio del paquete estadístico SPSS, y se utilizaronlas pruebas estadísticas Anova 1 Factor y la U Mann Whithey para variables no paramétricas, que generó una significancia estadística dep<0,05. Encontrándose una relación entre los signos fisiológicos y conductuales sobre el total de la escala. Se concluyó que la escala de SusanGivens es adecuada para la valoración del dolor en neonatos, ya que se obtienen probabilidades significativas del 95,7%.

  5. Norbert Elias: una introducción

    Directory of Open Access Journals (Sweden)

    Vera Weiler

    2010-07-01

    Full Text Available Hace seis años apareció en el mercado angloparlante el libro Norbert Elias Civilization and the human self-image de Stephen Mennell. El autor se había sentido impulsado a elaborar una especie de ayuda para la lectura de la obra de Elias a causa de "la tensión entre su convicción de que Elias es uno de los pensadores sociológicos más importantes del siglo XX cuyo trabajo tiene relevancia e interés más allá de una disciplina académica particular, por un lado, y las ideas que algunos de los colegas sociólogos le atribuyen, por el otro". El libro comienza con un capítulo biográfico, y trata la mayor parte de los trabajos de Elias en secciones temáticas que se rigen más o menos por la cronología de las publicaciones. Aunque la exposición de Mennell haya suscitado alguna polémica, ante todo por el tratamiento un tanto unilateral del contexto intelectual en el cual surgió Elias, parece haber consenso acerca de la pertinencia de ese tipo de introducción.

  6. UNA NUEVA ESPECIE DE SERJANIA (SAPINDACEAE

    Directory of Open Access Journals (Sweden)

    María Silvia Ferrucci

    2010-11-01

    Full Text Available Una nueva especie de Serjania de Brasil, Bahia, S.coradinii sí describir e Ilustra. El Fruto presenta una característica no reconocida antes en el género, la porción proximal hinchada del lóculo está ocupada por un cuerpo reniforme parenquimatos que rodea a la prolongación de la pared del tabique. La semilla se encuentra en la porción distal complanada del lóculo. Desde las doce secciones propuestas para el género, S.coradinii podria colocarse temporalmente en la sección Ceratococcus Radlk., hasta que alguna revisión de Serjania permita evaluar la estructura especial del lóculo

  7. The hyper-cube framework for ant colony optimization.

    Science.gov (United States)

    Blum, Christian; Dorigo, Marco

    2004-04-01

    Ant colony optimization is a metaheuristic approach belonging to the class of model-based search algorithms. In this paper, we propose a new framework for implementing ant colony optimization algorithms called the hyper-cube framework for ant colony optimization. In contrast to the usual way of implementing ant colony optimization algorithms, this framework limits the pheromone values to the interval [0,1]. This is obtained by introducing changes in the pheromone value update rule. These changes can in general be applied to any pheromone value update rule used in ant colony optimization. We discuss the benefits coming with this new framework. The benefits are twofold. On the theoretical side, the new framework allows us to prove that in Ant System, the ancestor of all ant colony optimization algorithms, the average quality of the solutions produced increases in expectation over time when applied to unconstrained problems. On the practical side, the new framework automatically handles the scaling of the objective function values. We experimentally show that this leads on average to a more robust behavior of ant colony optimization algorithms.

  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

    -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. 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...

  10. Chaos-order transition in foraging behavior of ants.

    Science.gov (United States)

    Li, Lixiang; Peng, Haipeng; Kurths, Jürgen; Yang, Yixian; Schellnhuber, Hans Joachim

    2014-06-10

    The study of the foraging behavior of group animals (especially ants) is of practical ecological importance, but it also contributes to the development of widely applicable optimization problem-solving techniques. Biologists have discovered that single ants exhibit low-dimensional deterministic-chaotic activities. However, the influences of the nest, ants' physical abilities, and ants' knowledge (or experience) on foraging behavior have received relatively little attention in studies of the collective behavior of ants. This paper provides new insights into basic mechanisms of effective foraging for social insects or group animals that have a home. We propose that the whole foraging process of ants is controlled by three successive strategies: hunting, homing, and path building. A mathematical model is developed to study this complex scheme. We show that the transition from chaotic to periodic regimes observed in our model results from an optimization scheme for group animals with a home. According to our investigation, the behavior of such insects is not represented by random but rather deterministic walks (as generated by deterministic dynamical systems, e.g., by maps) in a random environment: the animals use their intelligence and experience to guide them. The more knowledge an ant has, the higher its foraging efficiency is. When young insects join the collective to forage with old and middle-aged ants, it benefits the whole colony in the long run. The resulting strategy can even be optimal.

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

    Science.gov (United States)

    Lucky, Andrea; Trautwein, Michelle D; Guénard, Benoit S; Weiser, Michael D; Dunn, Robert R

    2013-01-01

    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.

  12. 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.

  13. 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

  14. 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...

  15. Sucking pump activity in feeding behaviour regulation in carpenter ants.

    Science.gov (United States)

    Falibene, Agustina; Gontijo, Alberto de Figueiredo; Josens, Roxana

    2009-06-01

    Modulation of liquid feeding-rate would allow insects to ingest more food in the same time when this was required. Ants can vary nectar intake rate by increasing sucking pump frequency according to colony requirements. We analysed electrical signals generated by sucking pump activity of ants during drinking solutions of different sucrose concentrations and under different carbohydrate-deprivation levels. Our aim was to define parameters that characterize the recordings and analyse their relationship with feeding behaviour. Signals showed that the initial and final frequencies of sucking pump activity, as well as the difference between them were higher in sugar-deprived ants. However, these parameters were not influenced by sucrose solution concentration, which affected the number of pump contractions and the volume per contraction. Unexpectedly, we found two different responses in feeding behaviour of starved and non-starved ants depending on concentration. Starved ants drank dilute solutions for the same length of time as non-starved ants but ingested higher volumes. While drinking the concentrated solutions, starved ants drank the same volume, but did so in a shorter time than the non-starved ones. Despite these differences, for each analysed concentration the total number of pump contractions remained constant independently of sugar-deprivation level. These results are discussed in the frame of feeding regulation and decision making in ant foraging behaviour.

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

    DEFF Research Database (Denmark)

    Fürst, Matthias A; Nash, David Richard

    2010-01-01

    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...... is necessary for conservation of this endangered butterfly....

  17. 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 cul...

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

    Science.gov (United States)

    Salyer, Adam; Bennett, Gary W; Buczkowski, Grzegorz A

    2014-01-01

    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 "back

  19. Los recursos humanos locales como personal de expedición en el mercado de cruceros antárticos

    Directory of Open Access Journals (Sweden)

    Marisol Vereda

    2016-01-01

    Full Text Available El objetivo de este trabajo se centra en conocer la inserción de los recursos humanos locales (residentes en Ushuaia y Argentina como miembros del staff de los cruceros de expedición de turismo antártico. Para tal fin se llevó adelante un análisis de los despachos de los buques con el fin de identificar los recursos humanos locales involucrados, a quienes se les solicitó que contestaran un cuestionario vía electrónica y, por último, se realizaron entrevistas a actores clave vinculados con el reclutamiento del staff. Los resultados demuestran una importante participación de los recursos humanos locales en el mercado del turismo antártico y permiten conocer los principales factores que favorecen y que también afectan dicha inserción, ayudando a pensar estrategias para lograr mayores posibilidades laborales en el futuro.

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

    DEFF Research Database (Denmark)

    Poulsen, Michael; Sapountzis, Panagiotis

    2012-01-01

    Ants are quite possibly the most successful insects on Earth, with an estimated 10 000 species worldwide, making up at least a third of the global insect biomass, and comprising several times the biomass of all land vertebrates combined. Ant species have diverse trophic habits, including herbivory...... 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...

  1. An ant colony algorithm on continuous searching space

    Science.gov (United States)

    Xie, Jing; Cai, Chao

    2015-12-01

    Ant colony algorithm is heuristic, bionic and parallel. Because of it is property of positive feedback, parallelism and simplicity to cooperate with other method, it is widely adopted in planning on discrete space. But it is still not good at planning on continuous space. After a basic introduction to the basic ant colony algorithm, we will propose an ant colony algorithm on continuous space. Our method makes use of the following three tricks. We search for the next nodes of the route according to fixed-step to guarantee the continuity of solution. When storing pheromone, it discretizes field of pheromone, clusters states and sums up the values of pheromone of these states. When updating pheromone, it makes good resolutions measured in relative score functions leave more pheromone, so that ant colony algorithm can find a sub-optimal solution in shorter time. The simulated experiment shows that our ant colony algorithm can find sub-optimal solution in relatively shorter time.

  2. A stochastic model of ant trail following with two pheromones

    CERN Document Server

    Malíčková, Miriam; Boďová, Katarína

    2015-01-01

    Colonies of ants are systems of interacting living organisms in which interactions between individuals and their environment can produce a reliable performance of a complex tasks without the need for centralised control. Particularly remarkable is the process of formation of refined paths between the nest and food sources that is essential for successful foraging. We have designed a simple stochastic off-lattice model of ant foraging in the absence of direct communication. The motion of ants is governed by two components - a random change in direction of motion that improves ability to explore the environment (facilitating food discovery), and a non-random global indirect interaction component based on pheromone signalling. Using numerical simulations we have studied the model behaviour in different parameter regimes and tested the ability of our model ants to adapt to changes in the external environment. The simulated behaviour of ants in the model recapitulated the experimentally observed behaviours of real...

  3. A Novel Parser Design Algorithm Based on Artificial Ants

    CERN Document Server

    Maiti, Deepyaman; Konar, Amit; Ramadoss, Janarthanan

    2008-01-01

    This article presents a unique design for a parser using the Ant Colony Optimization algorithm. The paper implements the intuitive thought process of human mind through the activities of artificial ants. The scheme presented here uses a bottom-up approach and the parsing program can directly use ambiguous or redundant grammars. We allocate a node corresponding to each production rule present in the given grammar. Each node is connected to all other nodes (representing other production rules), thereby establishing a completely connected graph susceptible to the movement of artificial ants. Each ant tries to modify this sentential form by the production rule present in the node and upgrades its position until the sentential form reduces to the start symbol S. Successful ants deposit pheromone on the links that they have traversed through. Eventually, the optimum path is discovered by the links carrying maximum amount of pheromone concentration. The design is simple, versatile, robust and effective and obviates ...

  4. Eavesdropping on cooperative communication within an ant-butterfly mutualism

    Science.gov (United States)

    Elgar, Mark A.; Nash, David R.; Pierce, Naomi E.

    2016-10-01

    Signalling is necessary for the maintenance of interspecific mutualisms but is vulnerable to exploitation by eavesdropping. While eavesdropping of intraspecific signals has been studied extensively, such exploitation of interspecific signals has not been widely documented. The juvenile stages of the Australian lycaenid butterfly, Jalmenus evagoras, form an obligate association with several species of attendant ants, including Iridomyrmex mayri. Ants protect the caterpillars and pupae, and in return are rewarded with nutritious secretions. Female and male adult butterflies use ants as signals for oviposition and mate searching, respectively. Our experiments reveal that two natural enemies of J. evagoras, araneid spiders and braconid parasitoid wasps, exploit ant signals as cues for increasing their foraging and oviposition success, respectively. Intriguingly, selection through eavesdropping is unlikely to modify the ant signal.

  5. AntNet: Distributed Stigmergetic Control for Communications Networks

    CERN Document Server

    Di Caro, G

    2011-01-01

    This paper introduces AntNet, a novel approach to the adaptive learning of routing tables in communications networks. AntNet is a distributed, mobile agents based Monte Carlo system that was inspired by recent work on the ant colony metaphor for solving optimization problems. AntNet's agents concurrently explore the network and exchange collected information. The communication among the agents is indirect and asynchronous, mediated by the network itself. This form of communication is typical of social insects and is called stigmergy. We compare our algorithm with six state-of-the-art routing algorithms coming from the telecommunications and machine learning fields. The algorithms' performance is evaluated over a set of realistic testbeds. We run many experiments over real and artificial IP datagram networks with increasing number of nodes and under several paradigmatic spatial and temporal traffic distributions. Results are very encouraging. AntNet showed superior performance under all the experimental condit...

  6. SECURING MOBILE ANT AGENT USING CHINESE REMAINDER THEOREM

    Directory of Open Access Journals (Sweden)

    Srinath Doss

    2013-01-01

    Full Text Available Recent days, research in wireless network becomes major area for the past few decades. In wireless routing many routing methods such as table driven, source driven; many characteristics such as reactive routing, proactive routing; many routing algorithms such as dijikstra’s shortest path, distributed bell-man ford algorithm are proposed in the literature. For effective wireless routing, the recent ant colony optimization proves better result than the existing methodologies. The ant colony optimization is a swarm intelligence technique which widely used for combinatorial optimization problems such as travelling salesman, network routing, clustering. The ant colony optimization is a real time routing protocol which offers highly reliable and optimal routing for both single path and multi path routing. As the ant is a small tiny mobile agent, providing security is critical issue. In this study, a secured ant colony optimization using Chinese remainder theorem is proposed.

  7. Remote Sensing Image Feature Extracting Based Multiple Ant Colonies Cooperation

    Directory of Open Access Journals (Sweden)

    Zhang Zhi-long

    2014-02-01

    Full Text Available This paper presents a novel feature extraction method for remote sensing imagery based on the cooperation of multiple ant colonies. First, multiresolution expression of the input remote sensing imagery is created, and two different ant colonies are spread on different resolution images. The ant colony in the low-resolution image uses phase congruency as the inspiration information, whereas that in the high-resolution image uses gradient magnitude. The two ant colonies cooperate to detect features in the image by sharing the same pheromone matrix. Finally, the image features are extracted on the basis of the pheromone matrix threshold. Because a substantial amount of information in the input image is used as inspiration information of the ant colonies, the proposed method shows higher intelligence and acquires more complete and meaningful image features than those of other simple edge detectors.

  8. Producción de un anticuerpo IgY específico contra el antígeno CD41 humano

    Directory of Open Access Journals (Sweden)

    Esteban J. Gutiérrez Calzado

    2009-01-01

    Full Text Available Desde hace dos décadas, la comunidad científica muestra un gran interés hacia la generación de anticuerpos en gallinas ponedoras por las ventajas que estas aportan al compararse con otros métodos tradicionales para este fin, sobre todo, en el hecho de lograrse en ellas, mejores respuestas de anticuerpos hacia antígenos de mamíferos muy conservados en la filogenia entre los que se encuentran glicoproteínas de membrana celular. El objetivo de este trabajo fue la generación de anticuerpos específicos contra la glicoproteína de membrana plaquetaria humana gpIIb/IIIa (antígeno CD41 en gallinas ponedoras. Para este propósito, se utilizaron gallinas de 22 semanas de edad, a las que se les aplicaron dosis de 20 ¿g de una preparación inmunopurificada de este antígeno plaquetario, emulsionada con adyuvante completo e incompleto de Freund para una primera y segunda inmunización respectivamente, a intervalos de un mes. Se cosecharon los huevos diariamente de los animales inmunizados a partir de un día antes de esta aplicación hasta 30 d posteriores a la segunda inyección, se procesaron estos para la extracción de los anticuerpos específicos presentes en ellos y se obtuvo la dinámica de producción de anticuerpos por el método clásico de Ouchterlony que se enfrentó a una preparación pura del antígeno. Las respuestas de anticuerpos obtenidas resultaron en títulos adecuados susceptibles de investigar en usos posteriores en la Medicina Transfusional específicamente para el análisis de la calidad de plasmas.

  9. Does Trichomes on the Plant Epidermic Surface Disturb Ants Locomotion?

    Directory of Open Access Journals (Sweden)

    Danon C. Cardoso

    2009-01-01

    Full Text Available Problem Statement: Many morphological characteristics, both physical and chemical, are used in the defense against herbivores on plants. Trichomes are structures used by plants as physics defense and when associated with glands combine physics and chemistry defense. Many species of ants are herbivores and use leaves and seeds, others ants use Extra Floral Nectars as a food resource, and the majority of the species are predators of other ants and other insects, and use plants as foraging substrate in search of prey. Likewise, on the assumption that ants feed preferentially in plants free of trichomes, we tested the hypothesis that trichomes plants clouded locomotion of ants. Approach: Experiments were carried out in the field using cotton to mimic the plants surface. Thirty traps for the treatment were assembled with cotton as well as other 30 experiments for the control (treatment without cotton. Each trap consisted of Petri dishes of 14,5 cm diameter with bait (sardine and honey in a disc (3 cm diameter in the center of the plate. Around the bait, 10 grams of cotton prepared uniformly were placed. Furthermore, morphometric analysis on the length of body and legs of ants was performed. Results: The number of ants which accessed baits in the center of Petri dishes in treatment with cotton was not statistically different of the number of accesses in the control treatment without cotton. The trichomes do not cloud locomotion of ants and that leg length is equal to or greater than body length. Conclusions/Recommendations: Data revealed that the trichomes do not cloud locomotion of ants; this allows the free walking of ants on the plants surface. However, glandular trichomes that combine physics and chemistry defense with release toxic and adhesives compounds when mechanically stressed may be more efficient in the defense against these insects.

  10. 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.

  11. El periodista, ante la espiral de silencio

    OpenAIRE

    Dr. Fermín Galindo Arranz

    1998-01-01

    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 inevitable...

  12. una experiencia en Mauritania

    Directory of Open Access Journals (Sweden)

    J. M. Fernández-Palacios

    2008-01-01

    Full Text Available El macizo del Tagant, en la República Islámica de Mauritania, alberga, a lo largo de una red interconectada de humedales, las últimas poblaciones de cocodrilo del desierto Crocodylus niloticus suchus, que hasta muy poco tiempo se consideraban extintas. Estas poblaciones han sido capaces de resistir la desertización del Sahara ocurrida en el Holoceno gracias a la existencia de una serie de pozas (gueltas en árabe, que se forman tras las lluvias monzónicas y que están conectadas entre sí a través de una red de cauces efímeros o permanentes que forman la Cuenca endorreica del Lago Gabou. Estos humedales, carentes de protección en la actualidad, forman además la base económica de los más de cuarenta mil habitantes del macizo, basada en la ganadería y en una precaria agricultura. Conocedor del potencial naturalístico de la zona, el Gobierno de la RIM encargó a nuestra ONG la preparación de una memoria para dar a conocer y conseguir laproteccióninternacional de la zona en el marco de la Convención Ramsar de protección de humedales (UNESCO. El presente trabajo narra como lautilización de una especie focal, el cocodrilo del desierto, para proteger estos valiosos humedales podría ser compatible con el desarrollo de una actividad turística sostenible, basado en el turismo naturalístico y científico, que posibilite un mayor desarrollo a los habitantes del Tagant.

  13. Desert ants achieve reliable recruitment across noisy interactions.

    Science.gov (United States)

    Razin, Nitzan; Eckmann, Jean-Pierre; Feinerman, Ofer

    2013-05-06

    We study how desert ants, Cataglyphis niger, a species that lacks pheromone-based recruitment mechanisms, inform each other about the presence of food. Our results are based on automated tracking that allows us to collect a large database of ant trajectories and interactions. We find that interactions affect an ant's speed within the nest. Fast ants tend to slow down, whereas slow ones increase their speed when encountering a faster ant. Faster ants tend to exit the nest more frequently than slower ones. So, if an ant gains enough speed through encounters with others, then she tends to leave the nest and look for food. On the other hand, we find that the probability for her to leave the nest depends only on her speed, but not on whether she had recently interacted with a recruiter that has found the food. This suggests a recruitment system in which ants communicate their state by very simple interactions. Based on this assumption, we estimate the information-theoretical channel capacity of the ants' pairwise interactions. We find that the response to the speed of an interacting nest-mate is very noisy. The question is then how random interactions with ants within the nest can be distinguished from those interactions with a recruiter who has found food. Our measurements and model suggest that this distinction does not depend on reliable communication but on behavioural differences between ants that have found the food and those that have not. Recruiters retain high speeds throughout the experiment, regardless of the ants they interact with; non-recruiters communicate with a limited number of nest-mates and adjust their speed following these interactions. These simple rules lead to the formation of a bistable switch on the level of the group that allows the distinction between recruitment and random noise in the nest. A consequence of the mechanism we propose is a negative effect of ant density on exit rates and recruitment success. This is, indeed, confirmed by our

  14. Vivienda y Emergencia ante desastres naturales producidos por Sismos. Sismo de 1997 en la comuna de Punitaqui, Chile

    Directory of Open Access Journals (Sweden)

    Ricardo Tapia Zarricueta

    2003-01-01

    Full Text Available En la resolución de la emergencia habitacional, si bien existe una coordinación entre las diferentes instituciones públicas, la vivienda transitoria ha sido históricamente una tipología de vivienda denominada “mediagua” por todos los sectores. Lo anterior permite afirmar que Chile no posee una propuesta de solución habitacional para resolver emergencias ante catástrofes naturales, siendo necesario y urgente avanzar en la búsqueda de propuestas eficientes y adecuadas a la magnitud de los daños que producen estos fenómenos naturales, para el caso, desde la acción habitacional y con un enfoque adecuado a lo que se requiere resolver, incluyendo en ellos, por ejemplo, ritmos, plazos y tecnologías en función de la emergencia su expresión e impacto. Junto con desarrollar un marco de antecedentes conceptuales, se analizan algunos procedimientos utilizados por las instituciones públicas para responder a la emergencia ante el sismo de 1997 en la comuna de Punitaqui, Chile.

  15. Testing the effects of ant invasions on non-ant arthropods with high-resolution taxonomic data.

    Science.gov (United States)

    Hanna, Cause; Naughton, Ida; Boser, Christina; Holway, David

    2015-10-01

    Invasions give rise to a wide range of ecological effects. Many invasions proceed without noticeable impacts on the resident biota, whereas others shift species composition and even alter ecosystem function. Ant invasions generate a broad spectrum of ecological effects, but controversy surrounds the extent of these impacts, especially with regard to how other arthropods are affected. This uncertainty in part results from the widespread use of low-resolution taxonomic data, which can mask the presence of other introduced species and make it difficult to isolate the effects of ant invasions on native species. Here, we use high-resolution taxonomic data to examine the effects of Argentine ant invasions on arthropods on Santa Cruz Island, California. We sampled arthropods in eight pairs of invaded and uninvaded plots and then collaborated with taxonomic experts to identify taxa in four focal groups: spiders, bark lice, beetles, and ants. Spiders, bark lice, and beetles made up ~40% of the 9868 non-ant arthropod individuals sampled; the majority of focal group arthropods were putatively native taxa. Although our results indicate strong negative effects of the Argentine ant on native ants, as is well documented, invaded and uninvaded plots did not differ with respect to the richness, abundance, or species composition of spiders, bark lice, and beetles. One common, introduced species of bark louse was more common in uninvaded plots than in invaded plots, and including this species into our analyses changed the relationship between bark louse richness vs. L. humile abundance from no relationship to a significant negative relationship. This case illustrates how failure to differentiate native and introduced taxa can lead to erroneous conclusions about the effects of ant invasions. Our results caution against unqualified assertions about the effects of ant invasions on non-ant arthropods, and more generally demonstrate that accurate assessments of invasion impacts depend on

  16. Overview of the Distribution, Habitat Association and Impact of Exotic Ants on Native Ant Communities in New Caledonia.

    Directory of Open Access Journals (Sweden)

    Maïa Berman

    Full Text Available Ants are among the most ubiquitous and harmful invaders worldwide, but there are few regional studies of their relationships with habitat and native ant communities. New Caledonia has a unique and diverse ant fauna that is threatened by exotic ants, but broad-scale patterns of exotic and native ant community composition in relation to habitat remain poorly documented. We conducted a systematic baiting survey of 56 sites representing the main New Caledonian habitat types: rainforest on ultramafic soils (15 sites, rainforest on volcano-sedimentary soils (13, maquis shrubland (15, Melaleuca-dominated savannas (11 and Acacia spirorbis thickets (2. We collected a total of 49 species, 13 of which were exotic. Only five sites were free of exotic species, and these were all rainforest. The five most abundant exotic species differed in their habitat association, with Pheidole megacephala associated with rainforests, Brachymyrmex cf. obscurior with savanna, and Wasmannia auropunctata and Nylanderia vaga present in most habitats. Anoplolepis gracilipes occurred primarily in maquis-shrubland, which contrasts with its rainforest affinity elsewhere. Multivariate analysis of overall ant species composition showed strong differentiation of sites according to the distribution of exotic species, and these patterns were maintained at the genus and functional group levels. Native ant composition differed at invaded versus uninvaded rainforest sites, in the absence of differences in habitat variables. Generalised Myrmicinae and Forest Opportunists were particularly affected by invasion. There was a strong negative relationship between the abundance of W. auropunctata and native ant abundance and richness. This emphasizes that, in addition to dominating many ant communities numerically, some exotic species, and in particular W. auropunctata, have a marked impact on native ant communities.

  17. Overview of the Distribution, Habitat Association and Impact of Exotic Ants on Native Ant Communities in New Caledonia.

    Science.gov (United States)

    Berman, Maïa; Andersen, Alan N; Hély, Christelle; Gaucherel, Cédric

    2013-01-01

    Ants are among the most ubiquitous and harmful invaders worldwide, but there are few regional studies of their relationships with habitat and native ant communities. New Caledonia has a unique and diverse ant fauna that is threatened by exotic ants, but broad-scale patterns of exotic and native ant community composition in relation to habitat remain poorly documented. We conducted a systematic baiting survey of 56 sites representing the main New Caledonian habitat types: rainforest on ultramafic soils (15 sites), rainforest on volcano-sedimentary soils (13), maquis shrubland (15), Melaleuca-dominated savannas (11) and Acacia spirorbis thickets (2). We collected a total of 49 species, 13 of which were exotic. Only five sites were free of exotic species, and these were all rainforest. The five most abundant exotic species differed in their habitat association, with Pheidole megacephala associated with rainforests, Brachymyrmex cf. obscurior with savanna, and Wasmannia auropunctata and Nylanderia vaga present in most habitats. Anoplolepis gracilipes occurred primarily in maquis-shrubland, which contrasts with its rainforest affinity elsewhere. Multivariate analysis of overall ant species composition showed strong differentiation of sites according to the distribution of exotic species, and these patterns were maintained at the genus and functional group levels. Native ant composition differed at invaded versus uninvaded rainforest sites, in the absence of differences in habitat variables. Generalised Myrmicinae and Forest Opportunists were particularly affected by invasion. There was a strong negative relationship between the abundance of W. auropunctata and native ant abundance and richness. This emphasizes that, in addition to dominating many ant communities numerically, some exotic species, and in particular W. auropunctata, have a marked impact on native ant communities.

  18. Trait-Mediated Indirect Effects of Phorid Flies on Ants

    Directory of Open Access Journals (Sweden)

    Hsun-Yi Hsieh

    2012-01-01

    Full Text Available This paper provides a synthesis of the ecological impact of phorid fly parasitoids on ants. We find the most important impact of phorids on ants to be trait-mediated effects. Phorids diminish the foraging activity of ants, frequently reducing the number and average size of foragers and reducing the amount of food retrieved by a colony. However, ants' coping mechanisms include changing foraging site and time. Phorids can also affect competition, especially through changes in the ability of the host to win in exploitative competition. Factors such as microclimate, resource size, and habitat complexity interact with phorids to change their effect on competition. By being highly specific and attacking ants high in the competitive hierarchy, phorids can alter the linear nature of the competitive transitivity, and by reducing the number of foragers, they can change the discovery-dominance tradeoff that is observed in some ant communities. Trait-mediated effects of phorids also cascade to other trophic levels. As an example, we discuss the trait-mediated cascade of phorids on the Azteca instabilis system in coffee. In this system, by reducing the foraging activity of A. instabilis, phorids reduce the direct and indirect biological control impact of the ant in the coffee agroecosystem.

  19. Ant-mediated seed dispersal in a warmed world

    Science.gov (United States)

    Patterson, Courtney M.; Rodriguez-Cabal, Mariano A.; Ribbons, Relena R.; Dunn, Robert R.; Sanders, Nathan J.

    2014-01-01

    Climate change affects communities both directly and indirectly via changes in interspecific interactions. One such interaction that may be altered under climate change is the ant-plant seed dispersal mutualism common in deciduous forests of eastern North America. As climatic warming alters the abundance and activity levels of ants, the potential exists for shifts in rates of ant-mediated seed dispersal. We used an experimental temperature manipulation at two sites in the eastern US (Harvard Forest in Massachusetts and Duke Forest in North Carolina) to examine the potential impacts of climatic warming on overall rates of seed dispersal (using Asarum canadense seeds) as well as species-specific rates of seed dispersal at the Duke Forest site. We also examined the relationship between ant critical thermal maxima (CTmax) and the mean seed removal temperature for each ant species. We found that seed removal rates did not change as a result of experimental warming at either study site, nor were there any changes in species-specific rates of seed dispersal. There was, however, a positive relationship between CTmax and mean seed removal temperature, whereby species with higher CTmax removed more seeds at hotter temperatures. The temperature at which seeds were removed was influenced by experimental warming as well as diurnal and day-to-day fluctuations in temperature. Taken together, our results suggest that while temperature may play a role in regulating seed removal by ants, ant plant seed-dispersal mutualisms may be more robust to climate change than currently assumed. PMID:24688863

  20. 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.

  1. Artificial ants deposit pheromone to search for regulatory DNA elements

    Directory of Open Access Journals (Sweden)

    Liu Yunlong

    2006-08-01

    Full Text Available Abstract Background Identification of transcription-factor binding motifs (DNA sequences can be formulated as a combinatorial problem, where an efficient algorithm is indispensable to predict the role of multiple binding motifs. An ant algorithm is a biology-inspired computational technique, through which a combinatorial problem is solved by mimicking the behavior of social insects such as ants. We developed a unique version of ant algorithms to select a set of binding motifs by considering a potential contribution of each of all random DNA sequences of 4- to 7-bp in length. Results Human chondrogenesis was used as a model system. The results revealed that the ant algorithm was able to identify biologically known binding motifs in chondrogenesis such as AP-1, NFκB, and sox9. Some of the predicted motifs were identical to those previously derived with the genetic algorithm. Unlike the genetic algorithm, however, the ant algorithm was able to evaluate a contribution of individual binding motifs as a spectrum of distributed information and predict core consensus motifs from a wider DNA pool. Conclusion The ant algorithm offers an efficient, reproducible procedure to predict a role of individual transcription-factor binding motifs using a unique definition of artificial ants.

  2. Ant-mediated seed dispersal in a warmed world.

    Science.gov (United States)

    Stuble, Katharine L; Patterson, Courtney M; Rodriguez-Cabal, Mariano A; Ribbons, Relena R; Dunn, Robert R; Sanders, Nathan J

    2014-01-01

    Climate change affects communities both directly and indirectly via changes in interspecific interactions. One such interaction that may be altered under climate change is the ant-plant seed dispersal mutualism common in deciduous forests of eastern North America. As climatic warming alters the abundance and activity levels of ants, the potential exists for shifts in rates of ant-mediated seed dispersal. We used an experimental temperature manipulation at two sites in the eastern US (Harvard Forest in Massachusetts and Duke Forest in North Carolina) to examine the potential impacts of climatic warming on overall rates of seed dispersal (using Asarum canadense seeds) as well as species-specific rates of seed dispersal at the Duke Forest site. We also examined the relationship between ant critical thermal maxima (CTmax) and the mean seed removal temperature for each ant species. We found that seed removal rates did not change as a result of experimental warming at either study site, nor were there any changes in species-specific rates of seed dispersal. There was, however, a positive relationship between CTmax and mean seed removal temperature, whereby species with higher CTmax removed more seeds at hotter temperatures. The temperature at which seeds were removed was influenced by experimental warming as well as diurnal and day-to-day fluctuations in temperature. Taken together, our results suggest that while temperature may play a role in regulating seed removal by ants, ant plant seed-dispersal mutualisms may be more robust to climate change than currently assumed.

  3. Species richness, equitability, and abundance of ants in disturbed landscapes

    Science.gov (United States)

    Graham, J.H.; Krzysik, A.J.; Kovacic, D.A.; Duda, J.J.; Freeman, D.C.; Emlen, J.M.; Zak, J.C.; Long, W.R.; Wallace, M.P.; Chamberlin-Graham, C.; Nutter, J.P.; Balbach, H.E.

    2009-01-01

    Ants are used as indicators of environmental change in disturbed landscapes, often without adequate understanding of their response to disturbance. Ant communities in the southeastern United States displayed a hump-backed species richness curve against an index of landscape disturbance. Forty sites at Fort Benning, in west-central Georgia, covered a spectrum of habitat disturbance (military training and fire) in upland forest. Sites disturbed by military training had fewer trees, less canopy cover, more bare ground, and warmer, more compact soils with shallower A-horizons. We sampled ground-dwelling ants with pitfall traps, and measured 15 habitat variables related to vegetation and soil. Ant species richness was greatest with a relative disturbance of 43%, but equitability was greatest with no disturbance. Ant abundance was greatest with a relative disturbance of 85%. High species richness at intermediate disturbance was associated with greater within-site spatial heterogeneity. Species richness was also associated with intermediate values of the normalized difference vegetation index (NDVI), a correlate of net primary productivity (NPP). Available NPP (the product of NDVI and the fraction of days that soil temperature exceeded 25 ??C), however, was positively correlated with species richness, though not with ant abundance. Species richness was unrelated to soil texture, total ground cover, and fire frequency. Ant species richness and equitability are potential state indicators of the soil arthropod community. Moreover, equitability can be used to monitor ecosystem change. ?? 2008 Elsevier Ltd.

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

    Science.gov (United States)

    Pless, Evlyn; Queirolo, Jovel; Pinter-Wollman, Noa; Crow, Sam; Allen, Kelsey; Mathur, Maya B; Gordon, Deborah M

    2015-01-01

    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.

  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. Contact rate modulates foraging efficiency in leaf cutting ants.

    Science.gov (United States)

    Bouchebti, S; Ferrere, S; Vittori, K; Latil, G; Dussutour, A; Fourcassié, V

    2015-12-21

    Lane segregation is rarely observed in animals that move in bidirectional flows. Consequently, these animals generally experience a high rate of head-on collisions during their journeys. Although these collisions have a cost (each collision induces a delay resulting in a decrease of individual speed), they could also have a benefit by promoting information transfer between individuals. Here we explore the impact of head-on collisions in leaf-cutting ants moving on foraging trails by artificially decreasing the rate of head-on collisions between individuals. We show that head-on collisions do not influence the rate of recruitment in these ants but do influence foraging efficiency, i.e. the proportion of ants returning to the nest with a leaf fragment. Surprisingly, both unladen and laden ants returning to the nest participate in the modulation of foraging efficiency: foraging efficiency decreases when the rate of contacts with both nestbound laden or unladen ants decreases. These results suggest that outgoing ants are able to collect information from inbound ants even when these latter do not carry any leaf fragment and that this information can influence their foraging decisions when reaching the end of the trail.

  7. Effect of interactions between harvester ants on forager decisions

    Directory of Open Access Journals (Sweden)

    Jacob D Davidson

    2016-10-01

    Full Text Available Harvester ant colonies adjust their foraging activity to day-to-day changes in food availability and hour-to-hour changes in environmental conditions. This collective behavior is regulated through interactions, in the form of brief antennal contacts, between outgoing foragers and returning foragers with food. Here we consider how an ant, waiting in the entrance chamber just inside the nest entrance, uses its accumulated experience of interactions to decide whether to leave the nest to forage. Using videos of field observations, we tracked the interactions and foraging decisions of ants in the entrance chamber. Outgoing foragers tended to interact with returning foragers at higher rates than ants that returned to the deeper nest and did not forage. To provide a mechanistic framework for interpreting these results, we develop a decision model in which ants make decisions based upon a noisy accumulation of individual contacts with returning foragers. The model can reproduce core trends and realistic distributions for individual ant interaction statistics, and suggests possible mechanisms by which foraging activity may be regulated at an individual ant level.

  8. 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.

  9. Ant Foraging As an Indicator of Tropical Dry Forest Restoration.

    Science.gov (United States)

    Hernández-Flores, J; Osorio-Beristain, M; Martínez-Garza, C

    2016-08-01

    Variation in foraging behavior may indicate differences in food availability and allow assessment of restoration actions. Ants are prominent bioindicators used in assessing ecological responses to disturbance. However, behavioral data have been poorly incorporated as an index. The foraging performance of red harvester ants was quantified in order to evaluate the success of a restoration ecology experiment in the tropical dry forest of Sierra de Huautla, Morelos, in central Mexico. Foraging performance by granivorous, Pogonomyrmex barbatus, ants was diminished after 6 and 8 years of cattle grazing and wood harvest were excluded as part of a restoration experiment in a highly degraded biome. Despite investing more time in foraging, ant colonies in exclusion plots showed lower foraging success and acquired less seed biomass than colonies in control plots. In line with the predictions of optimal foraging theory, in restored plots where ant foraging performance was poor, ants harvested a higher diversity of seeds. Reduced foraging success and increased harvest of non-preferred foods in exclusion plots were likely due to the growth of herbaceous vegetation, which impedes travel by foragers. Moreover, by 8 years of exclusion, 37% of nests in exclusion plots had disappeared compared to 0% of nests in control plots. Ants' foraging success and behavior were sensitive to changes in habitat quality due to the plant successional process triggered by a restoration intervention. This study spotlights on the utility of animal foraging behavior in the evaluation of habitat restoration programs.

  10. Learning and perceptual similarity among cuticular hydrocarbons in ants.

    Science.gov (United States)

    Bos, Nick; Dreier, Stephanie; Jørgensen, Charlotte G; Nielsen, John; Guerrieri, Fernando J; d'Ettorre, Patrizia

    2012-01-01

    Nestmate recognition in ants is based on perceived differences in a multi-component blend of hydrocarbons that are present on the insect cuticle. Although supplementation experiments have shown that some classes of hydrocarbons, such as methyl branched alkanes and alkenes, have a salient role in nestmate recognition, there was basically no information available on how ants detect and perceive these molecules. We used a new conditioning procedure to investigate whether individual carpenter ants could associate a given hydrocarbon (linear or methyl-branched alkane) to sugar reward. We then studied perceptual similarity between a hydrocarbon previously associated with sugar and a novel hydrocarbon. Ants learnt all hydrocarbon-reward associations rapidly and with the same efficiency, regardless of the structure of the molecules. Ants could discriminate among a large number of pairs of hydrocarbons, but also generalised. Generalisation depended both on the structure of the molecule and the animal's experience. For linear alkanes, generalisation was observed when the novel molecule was smaller than the conditioned one. Generalisation between pairs of methyl-alkanes was high, while generalisation between hydrocarbons that differed in the presence or absence of a methyl group was low, suggesting that chain length and functional group might be coded independently by the ant olfactory system. Understanding variations in perception of recognition cues in ants is necessary for the general understanding of the mechanisms involved in social recognition processes based on chemical cues.

  11. 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.

  12. Prospección de lepidópteros antófagos asociados a Acacia macracantha Willd. (Fabaceae) en el norte de Chile

    OpenAIRE

    Vargas,Héctor A.; Parra,Luis E.

    2009-01-01

    Se efectuó una prospección de larvas de lepidópteros antófagos asociados a Acacia macracantha Willd. (Fabaceae) en dos valles costeros del norte de Chile: Azapa y Chaca. Fueron registradas ocho especies, distribuidas en ocho géneros y cinco familias. La composición de especies del ensamble fue la misma en las dos localidades. Sin embargo, la abundancia del ensamble y la abundancia por especie fueron diferentes entre los valles.

  13. Interacciones bióticas en lagos Antárticos: investigaciones derivadas del proyecto LIMNOPOLAR en la Península Byers (Antártida marítima)

    OpenAIRE

    Rochera Cordellat, Carlos; Villaescusa, Juan Antonio; Diazmacip Barroso, María Eugenia; Gil-Delgado Alberti, José Antonio; Toro Velasco, Manuel; Rico Eguizabal, Eugenio; Velázquez Martínez, David; Quesada de Corral, Antonio; Camacho González, Antonio

    2011-01-01

    La estructura trófica de las comunidades planctónicas de los lagos antárticos se caracteriza por su sencillez, estando funcionalmente dominada por microorganismos. En estas cadenas tróficas el zooplancton, cuando está presente, ocupa generalmente la posición de consumidores superiores. Estos sistemas constituyen un marco muy adecuado en el que evaluar ciertos aspectos de la ecología trófica y funcional. Nuestro propósito ha sido valorar la aplicabilidad de una serie de teorías ecológicas, rel...

  14. Interacciones bióticas en lagos Antárticos. Investigaciones derivadas del proyecto LIMNOPOLAR en la Península Byers (Antártida marítima)

    OpenAIRE

    Rochera, C.; J. A. Villaescusa; M.E. Díazmacip; Gil-Delgado, J. A.; Toro, M; Rico, E.; Velázquez, D.; Quesada, A; A. Camacho

    2011-01-01

    La estructura trófica de las comunidades planctónicas de los lagos antárticos se caracteriza por su sencillez, estando funcionalmente dominada por microorganismos. En estas cadenas tróficas el zooplancton, cuando está presente, ocupa generalmente la posición de consumidores superiores. Estos sistemas constituyen un marco muy adecuado en el que evaluar ciertos aspectos de la ecología trófica y funcional. Nuestro propósito ha sido valorar la aplicabilidad de una serie de teorías ecológicas, rel...

  15. Plant defense, herbivory, and the growth of Cordia alliodora trees and their symbiotic Azteca ant colonies.

    Science.gov (United States)

    Pringle, Elizabeth G; Dirzo, Rodolfo; Gordon, Deborah M

    2012-11-01

    The effects of herbivory on plant fitness are integrated over a plant's lifetime, mediated by ontogenetic changes in plant defense, tolerance, and herbivore pressure. In symbiotic ant-plant mutualisms, plants provide nesting space and food for ants, and ants defend plants against herbivores. The benefit to the plant of sustaining the growth of symbiotic ant colonies depends on whether defense by the growing ant colony outpaces the plant's growth in defendable area and associated herbivore pressure. These relationships were investigated in the symbiotic mutualism between Cordia alliodora trees and Azteca pittieri ants in a Mexican tropical dry forest. As ant colonies grew, worker production remained constant relative to ant-colony size. As trees grew, leaf production increased relative to tree size. Moreover, larger trees hosted lower densities of ants, suggesting that ant-colony growth did not keep pace with tree growth. On leaves with ants experimentally excluded, herbivory per unit leaf area increased exponentially with tree size, indicating that larger trees experienced higher herbivore pressure per leaf area than smaller trees. Even with ant defense, herbivory increased with tree size. Therefore, although larger trees had larger ant colonies, ant density was lower in larger trees, and the ant colonies did not provide sufficient defense to compensate for the higher herbivore pressure in larger trees. These results suggest that in this system the tree can decrease herbivory by promoting ant-colony growth, i.e., sustaining space and food investment in ants, as long as the tree continues to grow.

  16. How Random Is Spatiotemporal Chaos of Langton's Ant?1

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    Luptáková I. I. Dirgová

    2015-12-01

    Full Text Available In recent years there have been numerous attempts to control chaotic behavior by evolutionary optimization. Most of these attempts were aimed at a study of chaotic systems defined by differential equations, but a few attempts were made also at evolutionary design of initial conditions or rules of cellular automata aimed at performing a specified task. We shall use a simple cellular automaton called Langton's ant after its designer, Christopher Langton. Generally, the ant acts on a 2D grid, where each it’s square can be either black or white. The ant is facing in one of four directions, and its behavior is described by 3 rules: (1 If ant is on a black square, it makes a left turn. (2 If ant is on a white square, it makes a right turn. (3 When ant moves to the next square, the one it was on reverses color. Despite simplicity of these rules, the ant produces extremely complex behavior, but after around 10000 steps the ant begins to construct a diagonal „highway“. This stable attractor has been always achieved regardless of the initial setting of black and white squares, but there is no proof, that it is always so. This behavior can be related to the undecidability of the halting problem. Our goal in this paper is to optimize initial conditions for the ant on a grid, so that it will be maximally “slowed down” in the sense that it should arrive at the preset boundary of the grid as late as possible. By a comparison of greedy stochastic optimization with an optimization by blind search are able to estimate, that is this chaotic system is not reasonably controllable and appears to have no regularity in the “optimal” initial conditions.

  17. Competitive assembly of South Pacific invasive ant communities

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    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

  18. Ants of the national park of American Samoa

    Science.gov (United States)

    Banko, Paul C.; Peck, Robert W.

    2015-01-01

    American Samoa makes up the eastern end of the Samoan Archipelago. On the islands of Tutuila, Taʽū and Ofu, the National Park of American Samoa (NPSA) protects about 4,000 ha of coastal, mid-slope and ridge-top forest. While the ant fauna of the Samoan Archipelago is considered relatively well documented, much of NPSA has never been surveyed for ants, leaving the fauna and its distribution poorly known. To address this shortfall, we systematically surveyed ants within the Tutuila and Taʽū units of NPSA using standard methods (hand collecting, litter sifting, and baits) at 39 sites within six vegetation types ranging from 8 to 945 m elevation. Forty-four ant species were identified, 19 of which are exotic to the Samoan Archipelago. Two notoriously aggressive species, Anoplolepis gracilipes and Pheidole megacephala were detected at two and seven sites, respectively. Both of these species largely excluded all other ants from bait, although their impact on ant community composition is unclear. A suite of habitat variables measured at each site was assessed to explain park-wide ant distributions. Of eight variables evaluated, only elevation was associated with ant community structure, as the ratio of native to exotic ant species increased significantly with elevation on Tutuila. Our survey documented two species not previously reported from American Samoa. Strumigenys eggersi, detected at 12 sites, appears to be a new immigrant to the Pacific Basin. A species of Pheidole was collected that likely represents an undescribed species. Solenopsis geminata, an aggressive species first reported on Tutuila in 2002, was not detected during our survey.

  19. Weaver ant role in cashew orchards in Vietnam.

    Science.gov (United States)

    Peng, Renkang; Lan, La Pham; Christian, Keith

    2014-08-01

    Cashew (Anacardium occidentale L.) is a very important source of income for more than 200,000 farmer households in Vietnam. The present cashew productivity in Vietnam is low and unstable, and pest damage is partly responsible for this. Cashew farmers rely on pesticides to minimize the damage, resulting in adverse impacts on farm environment and farmers' health. Weaver ants (Oecophylla spp) are effective biocontrol agents of a range of cashew insect pests in several cashew-growing countries, and these ants are widely distributed in Vietnam. The aim of this study is to evaluate the potential of weaver ants in cashew orchards in Vietnam. Field surveys and field experiment were conducted in five cashew orchards from July 2006 to January 2008 in Binh Phuoc, Dong Nai, and Ba Ria Vung Tau provinces, Vietnam. Based on the field surveys, the most important pests that damage flushing foliar and floral shoots and young cashew fruits and nuts were mosquito bugs, brown shoot borers, blue shoot borers, and fruit-nut borers. The damage caused by each of these pests was significantly lower on trees with weaver ants compared with trees without the ants, showing that the ants were able to keep these pest damages under the control threshold. Regular monitoring of the field experiment showed that weaver ants were similar to insecticides for controlling mosquito bugs, blue shoot borers, fruit-nut borers, leaf rollers, and leaf miners. Aphids did not become major pests in plot with weaver ants. To manage insect pest assemblage in cashew orchards, an integrated pest management using weaver ants as a major component is discussed.

  20. Una herencia sin testamento

    OpenAIRE

    Françoise Collin; Mayte Cantero Sánchez (trad.)

    2013-01-01

    En el presente trabajo Françoise Collin reflexiona sobre el concepto “transmisión” y su papel a la hora de construir una relación simbólica entre distintas generaciones de mujeres. Vinculada a la historia y a la idea de afiliación, constituye además una posibilidad política y ética que puede renovar el feminismo y ayudar a la constitución de un espacio simbólico compartido entre mujeres y hombres.

  1. Una herencia sin testamento

    Directory of Open Access Journals (Sweden)

    Françoise Collin

    2013-11-01

    Full Text Available En el presente trabajo Françoise Collin reflexiona sobre el concepto “transmisión” y su papel a la hora de construir una relación simbólica entre distintas generaciones de mujeres. Vinculada a la historia y a la idea de afiliación, constituye además una posibilidad política y ética que puede renovar el feminismo y ayudar a la constitución de un espacio simbólico compartido entre mujeres y hombres.

  2. La responsabilidad internacional del Estado colombiano ante la Corte Interamericana de Derechos Humanos por la inoperancia de la justicia interna

    Directory of Open Access Journals (Sweden)

    Mayra Mestizo Sosa

    2015-10-01

    Full Text Available En la actualidad la responsabilidad internacional del Estado Colombiano ante la Corte Interamericana de Derechos Humanos, evidencia un aumento de las violaciones a los estándares que contempla el Derecho Internacional de los Derechos Humanos, que exponen una situación compleja en la justicia interna, en una ausente dinámica procesal que perfeccione la instrucción del proceso y esclarezca las circunstancias y responsabilidades a que haya lugar. Se identifica un patrón de solución, proporcional a cada fase de la Administración de Justicia, correspondiente en su orden a la indagación e investigación, proporcionando un método de orientación, basado en el equilibrio de modelos matriciales, efectivos a la hora de formular una justicia clara e evidente, lo cual indica tener la capacidad de identificar lo simple de lo complejo, ante la inoperancia de la justicia interna. La metodología utilizada fue analítica, de tipo documental y explicativa, teniendo como soporte principal la Convención Americana de Derechos Humanos. En conclusión el Estado Colombiano debe generar mecanismos de seguimiento, monitoreo y control con criterios de transparencia, objetividad e independencia en los macros y micros procesos de la Administración de Justicia. Además de la implementación adecuada y eficiente de una Estrategia Jurídica Ordenada que proporcione una verdadera evolución jurídica.

  3. Optimal Power Flow Solution Using Ant Manners for Electrical Network

    Directory of Open Access Journals (Sweden)

    ALLAOUA, B.

    2009-02-01

    Full Text Available This paper presents ant manners and the collective intelligence for electrical network. Solutions for Optimal Power Flow (OPF problem of a power system deliberate via an ant colony optimization metaheuristic method. The objective is to minimize the total fuel cost of thermal generating units and also conserve an acceptable system performance in terms of limits on generator real and reactive power outputs, bus voltages, shunt capacitors/reactors, transformers tap-setting and power flow of transmission lines. Simulation results on the IEEE 30-bus electrical network show that the ant colony optimization method converges quickly to the global optimum.

  4. Ant Colony Algorithm for Solving QoS Routing Problem

    Institute of Scientific and Technical Information of China (English)

    SUN Li-juan; WANG Liang-jun; WANG Ru-chuan

    2004-01-01

    Based on the state transition rule, the local updating rule and the global updating rule of ant colony algorithm, we propose an improved ant colony algorithm of the least-cost quality of service (QoS) unicast routing. The algorithm is used for solving the routing problem with delay, delay jitter, bandwidth, and packet loss-constrained. In the simulation, about 52.33% ants find the successful QoS routing , and converge to the best. It is proved that the algorithm is efficient and effective.

  5. 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...

  6. Solving the Mixed Vrp with Backhauling Using Ants

    Science.gov (United States)

    Wassan, N. A.; Salhi, S.; Nagy, G.

    2009-08-01

    The mixed vehicle routing problem with backhauls is investigated using an ant system heuristic. This distribution problem seems to suffer from a lack of published work even though it has immense practical applicability especially within logistic systems. Some enhancements to the basic ant system algorithm are embedded into the search. In particular a focus is on the choice in the placement of ants, the use of a site-dependent candidate list, the introduction of a look ahead-based visibility, and appropriate strategies for updating local and global trails. Encouraging computational results are reported when tested on benchmark data sets.

  7. The Ants (Hymenoptera: Formicidae of Jaragua National Park, Dominican Republic

    Directory of Open Access Journals (Sweden)

    David Lubertazzi

    2014-01-01

    Full Text Available This study examined ant species richness in Jaragua National Park (Pedernales Province, Dominican Republic. Ants were sampled at 15 sites during late March and early April, 2012. Habitats sampled included dry forest, beach scrub, lakeside acacia scrub, and thorn woodland. Sixty-four species from 23 genera were collected. Species richness was higher than expected, considering only 125 species had previously been reported for all of Hispaniola. Jaragua National Park is part of the Jaragua-Bahoruco-Enriquillo Biosphere Reserve. The ant species richness observed in this study suggests that the park, along with larger reserve, is successful in preserving important habitat for insects.

  8. 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

  9. Paisaje antes de la batalla. Apuntes para un necesario debate sobre el paradigma ecológico en arquitectura y urbanismo

    OpenAIRE

    Verdaguer Viana-Cárdenas, Carlos

    2011-01-01

    Índice Introducción. Cartografiar la complejidad. Extremos de un debate. Entre los dos polos. La arquitectura verde antes de la eclosión. La perspectiva antiurbana. El reto de la globalización. Conclusión: la necesidad de nuevos instrumentos. Bibliografía. Notas.ResumenSi hubiera que resumir el intrincado panorama de todas las corrientes de pensamiento que han adoptado de una u otra forma el paradigma ecológico podría decirse que existe entre ellas una relativa coincidencia en el diagnóstico ...

  10. Regulación de la Conducta Alimentaria ante Cambios en el Contenido Nutricional del Alimento en Ratas

    OpenAIRE

    Antonio López-Espinoza; Alma Galindo; Alma Gabriela Martínez; Felipe Díaz; Virginia Aguilera; Carolina De la Torre-Ibarra; Azucena Cárdenas

    2008-01-01

    El objetivo del presente experimento fue evaluar la regulación de la conducta alimentaria ante cambios en el contenido nutricional del alimento en ratas albinas. Se utilizaron 32 ratas Wistar, fueron divididas en tres grupos, dos experimentales con 12 ratas cada uno y un Grupo Control con ocho ratas (hembras y machos). Todos los grupos iniciaron el experimento con 10 días de exposición a una dieta normo-calórica (23% de proteína, 14.3% de grasa y 47% de hidratos de carbono). Posteriormente, e...

  11. Procedimiento para la obtención de anticuerpos monoclonales a partir de muestras complejas de antígenos

    OpenAIRE

    Fraile de Paz, Sofía; Zafra-Amorós, Olga; Jiménez, José Ignacio; Lorenzo Prieto, Víctor de

    2011-01-01

    La presente invención se refiere a un proceso de selección, en un solo paso, de dominios variables de anticuerpos, preferiblemente de camello, unidos a fagos, de gran afinidad y especificidad para un antígeno concreto o diversas proteínas que comparten epítopos comunes. Además el procedimiento incluye de forma preferente una amplificación de los fagos que comprenden los dominios variables de interés, mediante la infección de bacterias por dichos fagos, lo que permite la obtención de un elevad...

  12. Los cabildos eclesiástico y civil de Antequera ante la crisis imperial de 1808-1810

    OpenAIRE

    CARLOS SÁNCHEZ SILVA; LUIS ALBERTO ARRIOJA DÍAZ VIRUELL

    2008-01-01

    El objetivo de este artículo es examinar las posturas que asumieron los cabildos eclesiástico y civil de Antequera del Valle de Oaxaca ante la crisis imperial de 1808: al plantear, por un lado, su fidelidad al rey, pero, por el otro, también la de saldar cuentas con varios asuntos pendientes, en particular respaldar una política radical y regresiva que suprimiera el sistema de intendencias en la Nueva España. En este sentido, el ensayo es un esfuerzo inicial por relacionar tanto el funcionami...

  13. Intervención psicológica en un caso de ansiedad ante exámenes

    OpenAIRE

    Mas, Blanca de; Cuesta, María Teresa

    2004-01-01

    El estudio de caso único que se presenta ha consistido en la intervención psicoterapéutica con un cliente que presentaba ansiedad severa ante los exámenes. Este cuadro ha venido acompañado por una serie de rasgos obsesivoscompulsivos de personalidad que le han predispuesto a experimentar la ansiedad moderada crónica característica del trastorno de ansiedad generalizada que se le ha diagnosticado tras la evaluación, interfiriendo significativamente en las vivencias de sus actividades recreativ...

  14. Fatty Amines from Little Black Ants, Monomorium minimum, and Their Biological Activities Against Red Imported Fire Ants, Solenopsis invicta.

    Science.gov (United States)

    Wang, Lei; Chen, Jian

    2015-08-01

    Red imported fire ants, Solenopsis invicta, are significant invasive pests. Certain native ant species can compete with S. invicta, such as the little black ant, Monomorium minimum. Defensive secretions may contribute to the competition capacity of native ants. The chemistry of ant defensive secretions in the genus Monomorium has been subjected to extensive research. The insecticidal alkaloids, 2,5-dialkyl-pyrrolidines and 2,5-dialkyl-pyrrolines have been reported to dominate the venom of M. minimum. In this study, analysis of defensive secretions of workers and queens of M. minimum revealed two primary amines, decylamine and dodecylamine. Neither amine has been reported previously from natural sources. Toxicity and digging suppression by these two amines against S. invicta were examined. Decylamine had higher toxicity to S. invicta workers than dodecylamine, a quicker knockdown effect, and suppressed the digging behavior of S. invicta workers at lower concentration. However, the amount of fatty amines in an individual ant was not enough to knockdown a fire ant or suppress its digging behavior. These amines most likely work in concert with other components in the chemical defense of M. minimum.

  15. Disruption of a protective ant-plant mutualism by an invasive ant increases elephant damage to savanna trees.

    Science.gov (United States)

    Riginos, Corinna; Karande, Megan A; Rubenstein, Daniel I; Palmer, Todd M

    2015-03-01

    Invasive species can indirectly affect ecosystem processes via the disruption of mutualisms. The mutualism between the whistling thorn acacia (Acacia drepanolobium) and four species of symbiotic ants is an ecologically important one; ants strongly defend trees against elephants, which can otherwise have dramatic impacts on tree cover. In Laikipia, Kenya, the invasive big-headed ant (Pheidole megacephala) has established itself at numerous locations within the last 10-15 years. In invaded areas on five properties, we found that three species of symbiotic Crematogaster ants were virtually extirpated, whereas Tetraponera penzigi co-occurred with P. megacephala. T. penzigi appears to persist because of its nonaggressive behavior; in a whole-tree translocation experiment, Crematogaster defended host trees against P. megacephala, but were extirpated from trees within hours. In contrast, T. penzigi retreated into domatia and withstood invading ants for >30 days. In the field, the loss of defensive Crematogaster ants in invaded areas led to a five- to sevenfold increase in the number of trees catastrophically damaged by elephants compared to uninvaded areas. In savannas, tree cover drives many ecosystem processes and provides essential forage for many large mammal species; thus, the invasion of big-headed ants may strongly alter the dynamics and diversity of East Africa's whistling thorn savannas by disrupting this system's keystone acaciaant mutualism.

  16. La gestión de la comunicación como una propuesta segura

    OpenAIRE

    González Oñate, Cristina; Bazataquí, Ana Alicia

    2009-01-01

    La complejidad de nuestra sociedad actual ha provocado la necesidad de gestionar la comunicación desde una concepción estratégica. Ante la difícil y presente situación económica, la comunicación cobra relevancia si lo que pretendemos es diferenciarnos de los demás. Debemos considerar que toda empresa y asociación comunica constantemente, proyecta valores y, por ello, manifiesta su marca

  17. CISTOSARCOMA PHYLLODES.PRESENTACIÓN DE UN CASO EN UNA NIÑA

    Directory of Open Access Journals (Sweden)

    Lidia Torres Aja

    2007-01-01

    Full Text Available Se presenta una paciente de 12 años de edad, con tumor de mama izquierda de 11.7 cm. de crecimiento rápido sin otra sintomatología acompañante, el cual fue diagnosticado como Cistosarcoma Phyllodes Benigno. En los 25 años de existencia de nuestro hospital es el primer tumor phyllodes en niña detectado.

  18. A new species of ant-loving cricket from Mallorca, Balearic Islands, Spain (Orthoptera, Myrmecophilidae

    Directory of Open Access Journals (Sweden)

    Stalling, T.

    2013-12-01

    Full Text Available A new species of ant-loving cricket, Myrmecophilus fuscus sp. n., is described and illustrated, based on individuals collected on the Balearic island of Mallorca, Spain. Lasius lasioides (Emery, 1869 was the host ant species. The habitat was evergreen oak forest. The holotype specimen was deposited in the collection of the Muséum d’Histoire Naturelle de Genève. The species is closely related to Myrmecophilus acervorum (Panzer, [1799] and belongs to the subgenus Myrmecophilus Berthold, 1827.Se describe e ilustra una nueva especie de grillo mirmecófilo, Myrmecophilus fuscus sp. n., procedente de la isla de Mallorca (islas Baleares, España. Lasius lasioides (Emery, 1869 es la especie hospedadora y su hábitat es el bosque perenne de roble. El holotipo se ha depositado en la colección del Muséum d’Histoire Naturelle de Ginebra. La nueva especie está estrechamente relacionada con Myrmecophilus acervorum (Panzer, [1799] y pertenece al subgénero Myrmecophilus Berthold, 1827.

  19. Efectos del cambio climático sobre pingüinos antárticos

    Directory of Open Access Journals (Sweden)

    A. Barbosa

    2011-01-01

    Full Text Available La península antártica es uno de los lugares del planeta donde más y más rápidamente están aumentando las temperaturas y por tanto donde se están produciendo notables cambios ambientales debidos al cambio climático. Ejemplos de estos cambios son la disminución del hielo marino, el descenso de la presencia de algas en este hielo y una reducción de la abundancia de krill. Como consecuencia, las poblaciones de pingüinos, en particular el pingüino de adelia y el pingüino barbijo están sufriendo un acusado descenso. En el presente artículo se profundiza en las consecuencias del cambio climático en la Antártida en los pingüinos con especial atención a los resultados obtenidos dentro del proyecto PINGUCLIM que trata de determinar dichos efectos en la fisiología de estas especies a través de la interacción parásito-hospedador.

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

    Science.gov (United States)

    De La Riva, Deborah G; Trumble, John T

    2016-06-01

    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.

  1. y en el proceso (ex ante

    Directory of Open Access Journals (Sweden)

    Cristo Avimael Vázquez Ceballos

    2008-01-01

    Full Text Available El presente artículo parte de considerar la legitimidad como uno de los objetivos de la política social, a fin de ofrecer una reflexión acerca de cómo el gobierno federal mexicano ha pretendido legitimarse a través de acciones sociales supuestamente solidarias, distributivas y universalistas, en un primer momento, como focalizadas y segundo, corresponsables con los ciudadanos.

  2. ¿...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.

  3. Rol del sector salud ante el cambio climático

    Directory of Open Access Journals (Sweden)

    Tania Burstein Roda

    2016-01-01

    Full Text Available El presente artículo reúne los resultados y conclusiones obtenidos de diversos estudios llevados a cabo por organizaciones mundiales e intergubernamentales dedicadas a la investigación y a la promoción de políticas y estrategias para lograr respuestas acertadas y eficientes ante los efectos negativos del cambio climático en la salud pública. Es, por otro lado, un llamado a la concientización de la comunidad sanitaria del rol protagonista y estratégico que debe asumir con relación a este fenómeno global y de la transversalidad en su adecuada gestión, que requiere del trabajo coordinado a nivel transectorial e interinstitucional para lograr una verdadera resiliencia social y ambiental.

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

    OpenAIRE

    2015-01-01

    En este artículo se hace un análisis teórico del comportamiento que deberían asumir 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 fundament...

  5. Texere: diseño de una escuela de liderazgo enfermero

    OpenAIRE

    Soria Sarnago, María Teresa

    2013-01-01

    Con el desarrollo de este proyecto se pretende justificar, ante la evidenciada crisis en los puestos de mando intermedio de enfermería del Servicio Navarro de Salud-Osasunbidea (SNS-O), la importancia de su formación para el ejercicio de un liderazgo eficaz y presentar como alternativa el diseño de una “Escuela de Liderazgo Enfermero”. La metodología empleada ha conllevado una revisión bibliográfica (ver I) crítico-analítica de la mejor evidencia científica posible, relacion...

  6. El comportamiento del consumidor de cine: una revisión preliminar de la literatura

    OpenAIRE

    Adriana Cepeda

    2008-01-01

    El comportamiento del consumidor de cine se ha relacionado con múltiples factores interconectados (e.g., emocionales, cognitivos, situacionales). Diversas investigaciones han contribuido al conocimiento sobre la segmentación del mercado y las variables que inciden en: (a) la escogencia de una película, (b) la repuesta ante una película vista, y (c) la taquilla, pero los hallazgos en estas áreas no son concluyentes, a pesar de los modelos que han sido formulados. Estos resultados han estado en...

  7. Los usos de la historia: una reflexión sobre el agua

    OpenAIRE

    Fontana Lázaro, Josep

    2013-01-01

    Las páginas que siguen pretenden ser una propuesta, como ejemplo, de alguna de las muchas formas en que el historiador puede aplicar su trabajo a fines socialmente útiles y con plena conciencia de que lo fundamental es combatir el modelo historiográfico que sirve de base y legitimación a las políticas neoliberales que estamos sufriendo. Ante una población mundial en crecimiento, el miedo al hambre y el estímulo de los altos precios de los alimentos se han conjugado para llevar a gobiernos y g...

  8. El ejercicio físico, una contramedida en condiciones de micro-gravedad

    OpenAIRE

    2015-01-01

    La presente tesina realiza una descripción y un análisis del ejercicio físico utilizado por las distintas agencias espaciales como una contramedida ante la exposición prolongada en micro-gravedad. Se dan a conocer y se explican los motivos por los cuales es necesario desarrollar un plan de entrenamiento de fuerza y resistencia cardiovascular en el espacio exterior. En la investigación podemos diferenciar tres grandes partes. La primera en donde se caracteriza el ambiente de mic...

  9. Algunos criterios éticos para una adecuada comunicación interna en las organizaciones

    Directory of Open Access Journals (Sweden)

    Gabriel Galdón López

    2012-04-01

    Full Text Available Ante la escasez y falta de sistematización de los estudios específicos sobre ética de la comunicación interna en las organizaciones, y teniendo en cuenta la necesidad de fundamentar en principios sólidos, estables y humanos toda institución, se propone una serie de criterios éticos en éste ámbito, tales como el personalista, el de veracidad, el prudencial y el convivencial. Criterios que remiten a unas virtudes y se desarrollan en varios niveles de operatividad.

  10. 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 ...

  11. Variable interaction specificity and symbiont performance in Panamanian Trachymyrmex and Sericomyrmex fungus-growing ants

    DEFF Research Database (Denmark)

    de Fine Licht, Henrik Hjarvard; Boomsma, Jacobus Jan

    2014-01-01

    spectra were significantly affected by both cultivar species and farming ant species, and more so for certain ant-cultivar combinations than others. However, relative changes in activity of single enzymes only depended on cultivar genotype and not on the ant species farming a cultivar. Conclusions Ant...

  12. 9 CFR 381.70 - Ante mortem inspection; when required; extent.

    Science.gov (United States)

    2010-01-01

    ... 9 Animals and Animal Products 2 2010-01-01 2010-01-01 false Ante mortem inspection; when required... AND VOLUNTARY INSPECTION AND CERTIFICATION POULTRY PRODUCTS INSPECTION REGULATIONS Ante Mortem Inspection § 381.70 Ante mortem inspection; when required; extent. (a) An ante mortem inspection of...

  13. 9 CFR 309.1 - Ante-mortem inspection in pens of official establishments.

    Science.gov (United States)

    2010-01-01

    ... 9 Animals and Animal Products 2 2010-01-01 2010-01-01 false Ante-mortem inspection in pens of... AND VOLUNTARY INSPECTION AND CERTIFICATION ANTE-MORTEM INSPECTION § 309.1 Ante-mortem inspection in...) Such ante-mortem inspection shall be made in pens on the premises of the establishment at which...

  14. 9 CFR 354.122 - Condemnation on ante-mortem inspection.

    Science.gov (United States)

    2010-01-01

    ... 9 Animals and Animal Products 2 2010-01-01 2010-01-01 false Condemnation on ante-mortem inspection... Procedures; Ante-Mortem Inspections § 354.122 Condemnation on ante-mortem inspection. Rabbits found in a... showing, on ante-mortem inspection, any disease or condition, that under §§ 354.129 to 354.131,...

  15. 9 CFR 354.123 - Segregation of suspects on ante-mortem inspection.

    Science.gov (United States)

    2010-01-01

    ... 9 Animals and Animal Products 2 2010-01-01 2010-01-01 false Segregation of suspects on ante-mortem... Inspection Procedures; Ante-Mortem Inspections § 354.123 Segregation of suspects on ante-mortem inspection. All rabbits which, on ante-mortem inspection, do not plainly show, but are suspected of being...

  16. Draft Genome Sequence of the Ant-associated Fungus Phialophora attae (CBS 131958)

    NARCIS (Netherlands)

    de Hoog, S.

    2015-01-01

    The black yeast Phialophora attae was isolated from the cuticle of tropical ant gynes. The ant-fungus association is sustained due to symbiotic evolutionary adaptations that allow fungal assimilation and tolerance of toxic compounds produced by the ant. The genome sequence of the first ant-associate

  17. Using insect traps to increase weaver ant (Oecophylla longinoda) prey capture

    DEFF Research Database (Denmark)

    Lynegaard, Gina; Offenberg, Joachim; Fast, Thora;

    2014-01-01

    production of ants. Malaise like traps placed in trees may catch flying insects without catching ants, as ants may use pheromone trails to navigate in and out of the traps. Thus, ants may increase their prey intake if they are able to extract insects caught in traps. In a mango plantation in Tanzania, we...

  18. Tuning PID Controller Using Multiobjective Ant Colony Optimization

    Directory of Open Access Journals (Sweden)

    Ibtissem Chiha

    2012-01-01

    Full Text Available This paper treats a tuning of PID controllers method using multiobjective ant colony optimization. The design objective was to apply the ant colony algorithm in the aim of tuning the optimum solution of the PID controllers (Kp, Ki, and Kd by minimizing the multiobjective function. The potential of using multiobjective ant algorithms is to identify the Pareto optimal solution. The other methods are applied to make comparisons between a classic approach based on the “Ziegler-Nichols” method and a metaheuristic approach based on the genetic algorithms. Simulation results demonstrate that the new tuning method using multiobjective ant colony optimization has a better control system performance compared with the classic approach and the genetic algorithms.

  19. Hybrid Ant Algorithm and Applications for Vehicle Routing Problem

    Science.gov (United States)

    Xiao, Zhang; Jiang-qing, Wang

    Ant colony optimization (ACO) is a metaheuristic method that inspired by the behavior of real ant colonies. ACO has been successfully applied to several combinatorial optimization problems, but it has some short-comings like its slow computing speed and local-convergence. For solving Vehicle Routing Problem, we proposed Hybrid Ant Algorithm (HAA) in order to improve both the performance of the algorithm and the quality of solutions. The proposed algorithm took the advantages of Nearest Neighbor (NN) heuristic and ACO for solving VRP, it also expanded the scope of solution space and improves the global ability of the algorithm through importing mutation operation, combining 2-opt heuristics and adjusting the configuration of parameters dynamically. Computational results indicate that the hybrid ant algorithm can get optimal resolution of VRP effectively.

  20. 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

    2015-07-28

    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.

  1. The Evolutionary Ecology of Multi-Queen Breeding in Ants

    DEFF Research Database (Denmark)

    Huszár, Dóra Borbála

    Ants, like other social insects, have evolved cooperative societies based on kinship. Colonies headed by a single breeding queen (monogyny) was the ancestral state but today ca. half of the ant species live in multi-queen societies (polygyny), which can sometimes reach extreme sizes (supercolony...... that only ants, not the other obligatorily social insects were able to decrease social and sexual conflicts sufficiently to make polygyny reach obligate form in some species. This can be explained by general ant biology, such as perennial lifehistories, foraging on foot instead of wings and having one...... nest types. High inbreeding also resulted in high genetic relatedness, which could imply substantial indirect fitness benefits since obviously negative fitness effects were not produced such as suboptimal body size, significant fluctuating asymmetry in reproductively relevant traits, or diploid male...

  2. All-Optical Implementation of the Ant Colony Optimization Algorithm

    Science.gov (United States)

    Hu, Wenchao; Wu, Kan; Shum, Perry Ping; Zheludev, Nikolay I.; Soci, Cesare

    2016-05-01

    We report all-optical implementation of the optimization algorithm for the famous “ant colony” problem. Ant colonies progressively optimize pathway to food discovered by one of the ants through identifying the discovered route with volatile chemicals (pheromones) secreted on the way back from the food deposit. Mathematically this is an important example of graph optimization problem with dynamically changing parameters. Using an optical network with nonlinear waveguides to represent the graph and a feedback loop, we experimentally show that photons traveling through the network behave like ants that dynamically modify the environment to find the shortest pathway to any chosen point in the graph. This proof-of-principle demonstration illustrates how transient nonlinearity in the optical system can be exploited to tackle complex optimization problems directly, on the hardware level, which may be used for self-routing of optical signals in transparent communication networks and energy flow in photonic systems.

  3. Communal peeing: a new mode of flood control in ants

    Science.gov (United States)

    Maschwitz, Ulrich; Moog, J.

    The behavioral response of the obligate bamboo-nesting ant Cataulacus muticus to nest flooding was studied in a perhumid tropical rainforest in Malaysia and in the laboratory. The hollow internodes of giant bamboo, in which C. muticus exclusively nests, are prone to flooding by heavy rains. The ants showed a two-graded response to flooding. During heavy rain workers block the nest entrances with their heads to reduce water influx. However, rainwater may still intrude into the nest chamber. The ants respond by drinking the water, leaving the nest and excreting water droplets on the outer stem surface. This cooperative 'peeing' behavior is a new survival mechanism adaptive to the ants' nesting ecology. Laboratory experiments conducted with two other Cataulacus species, C. catuvolcus colonizing small dead twigs and C. horridus inhabiting rotten wood, did not reveal any form of water-bailing behavior.

  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

    Recognition of group members is of fundamental importance in social animals, allowing individuals to protect resources against intruders and parasites, as well as ensuring social cohesion within the group. In ants and other social insects, social recognition relies on multicomponent chemical...... been suggested that associative learning might play a role in nestmate recognition. We investigated whether Camponotus aethiops ants can associate a complete cuticular hydrocarbon profile, consisting of about 40 compounds, with a food reward and whether the new association, developed in an appetitive...... 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. Melissotarsus ants are likely able to digest plant polysaccharides.

    Science.gov (United States)

    Mony, Ruth; Dejean, Alain; Bilong, Charles Félix Bilong; Kenne, Martin; Rouland-Lefèvre, Corinne

    2013-10-01

    Melissotarsus ants have an extremely specialized set of behaviours. Both workers and gynes tunnel galleries in their host tree bark. Workers walk with their mesothoracic legs pointing upwards and tend Diaspididae hemiptera for their flesh. The ants use their forelegs to plug the galleries with silk that they secrete themselves. We hypothesised that the ants' energetic needs for nearly constant gallery digging could be satisfied through the absorption of host tree tissues; so, using basic techniques, we examined the digestive capacities of workers from two species. We show that workers are able to degrade oligosaccharides and heterosides as well as, to a lesser degree, polysaccharides. This is one of the rare reports on ants able to digest plant polysaccharides other than starch.

  6. 安科特纳Acterna ANT-10G

    Institute of Scientific and Technical Information of China (English)

    2004-01-01

    ANT-10G-SDH版是ANT-20SE家族的成员,它可以在实验室也可以在现场使用。由于其优异的测试灵活性,ANT-10G使测试者能够利用多种方法对所有主要质量参数进行测试,从简单的误码率测试(BERTs),性能和指针分析,到复杂的同步问题。ANT-10G也可按照用户需要定制。

  7. Ant Genetics: Reproductive Physiology, Worker Morphology, and Behavior.

    Science.gov (United States)

    Friedman, D A; Gordon, D M

    2016-07-01

    Many exciting studies have begun to elucidate the genetics of the morphological and physiological diversity of ants, but as yet few studies have investigated the genetics of ant behavior directly. Ant genomes are marked by extreme rates of gene turnover, especially in gene families related to olfactory communication, such as the synthesis of cuticular hydrocarbons and the perception of environmental semiochemicals. Transcriptomic and epigenetic differences are apparent between reproductive and sterile females, males and females, and workers that differ in body size. Quantitative genetic approaches suggest heritability of task performance, and population genetic studies indicate a genetic association with reproductive status in some species. Gene expression is associated with behavior including foraging, response to queens attempting to join a colony, circadian patterns of task performance, and age-related changes of task. Ant behavioral genetics needs further investigation of the feedback between individual-level physiological changes and socially mediated responses to environmental conditions.

  8. Ant colonies prefer infected over uninfected nest sites

    DEFF Research Database (Denmark)

    Pontieri, Luigi; Vojvodic, Svjetlana; Graham, Riley

    2014-01-01

    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...

  9. Incremental Web Usage Mining Based on Active Ant Colony Clustering

    Institute of Scientific and Technical Information of China (English)

    SHEN Jie; LIN Ying; CHEN Zhimin

    2006-01-01

    To alleviate the scalability problem caused by the increasing Web using and changing users' interests, this paper presents a novel Web Usage Mining algorithm-Incremental Web Usage Mining algorithm based on Active Ant Colony Clustering. Firstly, an active movement strategy about direction selection and speed, different with the positive strategy employed by other Ant Colony Clustering algorithms, is proposed to construct an Active Ant Colony Clustering algorithm, which avoid the idle and "flying over the plane" moving phenomenon, effectively improve the quality and speed of clustering on large dataset. Then a mechanism of decomposing clusters based on above methods is introduced to form new clusters when users' interests change. Empirical studies on a real Web dataset show the active ant colony clustering algorithm has better performance than the previous algorithms, and the incremental approach based on the proposed mechanism can efficiently implement incremental Web usage mining.

  10. Kunstipiiride valvaja Ants Juske ja "12 tooli" / Peeter Linnap

    Index Scriptorium Estoniae

    Linnap, Peeter, 1960-

    1999-01-01

    Vastuseks A. Juske kirjutisele 23. nov. Eesti Päevalehes "Backdoor Media" kunstiväljaandest. Kui pahempoolne tohib olla vasakpoolsus kultuuris Ants Juske arvates. Ilmunud ka raamatus: Linnap, P. Silmakirjad. Tartu, 2007, lk. 228

  11. Ant Colony Search Algorithm for Solving Unit Commitment Problem

    Directory of Open Access Journals (Sweden)

    M.Surya Kalavathi

    2013-07-01

    Full Text Available In this paper Ant Colony Search Algorithm is proposed to solve thermal unit commitment problem. Ant colony search (ACS studies are inspired from the behavior of real ant colonies that are used to solve function or combinatorial optimization problems. In the ACSA a set of cooperating agents called ants cooperates to find good solution of unit commitment problem of thermal units. The UC problem is to determine a minimal cost turn-on and turn-off schedule of a set of electrical power generating units to meet a load demand while satisfying a set of operational constraints. This proposed approach is a tested on 10 unit power system and compared to conventional methods.

  12. 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...... among the five host ants, the ability of Ophiocordyceps to shift between such distant hosts is remarkable; the results are discussed in the context of ant ecological immunology and fungal invasion strategies....

  13. Efficient Egress of Escaping Ants Stressed with Temperature

    Science.gov (United States)

    Boari, Santiago; Josens, Roxana; Parisi, Daniel R.

    2013-01-01

    In the present work we investigate the egress times of a group of Argentine ants (Linepithema humile) stressed with different heating speeds. We found that the higher the temperature ramp is, the faster ants evacuate showing, in this sense, a group-efficient evacuation strategy. It is important to note that even when the life of ants was in danger, jamming and clogging was not observed near the exit, in accordance with other experiments reported in the literature using citronella as aversive stimuli. Because of this clear difference between ants and humans, we recommend the use of some other animal models for studying competitive egress dynamics as a more accurate approach to understanding competitive egress in human systems. PMID:24312264

  14. 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.

  15. 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.

  16. Simple cellular automata to mimic foraging ants submitted to abduction

    CERN Document Server

    Tejera, F

    2015-01-01

    Many species of ants forage by building up two files: an outbound one moving from the nest to the foraging area, and a nestbound one, returning from it to the nest. Those files are eventually submitted to different threats. If the danger is concentrated at one point of the file, one might expect that ants returning to the nest will pass danger information to their nestmates moving in the opposite direction towards the danger area. In this paper, we construct simple cellular automata models for foraging ants submitted to localized abduction, were danger information is transmitted using different protocols, including the possibility of no transmission. The parameters we have used in the simulations have been estimated from actual experiments under natural conditions. So, it would be easy to test our information-transmission hypothese in real experiments. Preliminary experimental results published elsewhere suggest that the behavior of foraging ants of the species Atta insularis is best described using the hypot...

  17. 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.

  18. Public goods dilemma in asexual ant societies.

    Science.gov (United States)

    Dobata, Shigeto; Tsuji, Kazuki

    2013-10-01

    Cooperation in biological, social, and economic groups is underpinned by public goods that are generated by group members at some personal cost. Theory predicts that public goods will be exploited by cheaters who benefit from the goods by not paying for them, thereby leading to the collapse of cooperation. This situation, described as the "public goods dilemma" in game theory, makes the ubiquity of cooperation a major evolutionary puzzle. Despite this generalization, the demonstration of genetic background and fitness effects of the public goods dilemma has been limited to interactions between viruses and between cells, and thus its relevance at higher levels of organismal complexity is still largely unexplored. Here we provide experimental evidence for the public goods dilemma in a social insect, the ant Pristomyrmex punctatus. In this species, all workers are involved in both asexual reproduction and cooperative tasks. Genetic cheaters infiltrate field colonies, reproducing more than the workers but shunning cooperative tasks. In laboratory experiments, cheaters outcompeted coexisting workers in both survival and reproduction, although a group composed only of cheaters failed to produce offspring. The operations of the public goods dilemma in P. punctatus showed a remarkable convergence with those in microbial societies, not only in fitness consequences but also in behavioral mechanisms. Our study reinforces the evolutionary impact of cheaters on diverse cooperative systems in the laboratory and in the field.

  19. Ant Colony Optimisation for Backward Production Scheduling

    Directory of Open Access Journals (Sweden)

    Leandro Pereira dos Santos

    2012-01-01

    Full Text Available The main objective of a production scheduling system is to assign tasks (orders or jobs to resources and sequence them as efficiently and economically (optimised as possible. Achieving this goal is a difficult task in complex environment where capacity is usually limited. In these scenarios, finding an optimal solution—if possible—demands a large amount of computer time. For this reason, in many cases, a good solution that is quickly found is preferred. In such situations, the use of metaheuristics is an appropriate strategy. In these last two decades, some out-of-the-shelf systems have been developed using such techniques. This paper presents and analyses the development of a shop-floor scheduling system that uses ant colony optimisation (ACO in a backward scheduling problem in a manufacturing scenario with single-stage processing, parallel resources, and flexible routings. This scenario was found in a large food industry where the corresponding author worked as consultant for more than a year. This work demonstrates the applicability of this artificial intelligence technique. In fact, ACO proved to be as efficient as branch-and-bound, however, executing much faster.

  20. 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.

  1. La tentación de Cristino: propuesta escénica de Febea en una égloga dramática de Juan del Encina

    OpenAIRE

    2014-01-01

    El presente trabajo ofrece una (re)interpretación de una de las últimas obras teatrales del salmantino Juan del Encina (1468-1529), la Égloga de Cristino y Febea (c. 1509). Ante la falta de acotaciones explícitas, empleo las didascalias implícitas del texto dramático para mostrar una posible caracterización física de Febea. Se trata de una (pro)puesta en escena del personaje empleando diversas fuentes (textuales, iconografía o vestimenta). Este trabajo se halla financiado por la Junta de C...

  2. Introduction to Ant Colony Algorithm and Its Application in CIMS

    Institute of Scientific and Technical Information of China (English)

    2002-01-01

    Ant colony algorithm is a novel simulated ecosystem e volutionary algorithm, which is proposed firstly by Italian scholars M.Dorigo, A . Colormi and V. Maniezzo. Enlightened by the process of ants searching for food , scholars bring forward this new evolutionary algorithm. This algorithm has sev eral characteristics such as positive feedback, distributed computing and stro nger robustness. Positive feedback and distributed computing make it easier to find better solutions. Based on these characteristics...

  3. Ant Colony Optimization for Train Scheduling: An Analysis

    OpenAIRE

    Sudip Kumar Sahana; Aruna Jain; Prabhat Kumar Mahanti

    2014-01-01

    This paper deals on cargo train scheduling between source station and destination station in Indian railways scenario. It uses Ant Colony Optimization (ACO) technique which is based on ant’s food finding behavior. Iteration wise convergence process and the convergence time for the algorithm are studied and analyzed. Finally, the run time analysis of Ant Colony Optimization Train Scheduling (ACOTS) and Standard Train Scheduling (STS) algorithm has been performed.

  4. Ant Colony Optimization for Train Scheduling: An Analysis

    Directory of Open Access Journals (Sweden)

    Sudip Kumar Sahana

    2014-01-01

    Full Text Available This paper deals on cargo train scheduling between source station and destination station in Indian railways scenario. It uses Ant Colony Optimization (ACO technique which is based on ant’s food finding behavior. Iteration wise convergence process and the convergence time for the algorithm are studied and analyzed. Finally, the run time analysis of Ant Colony Optimization Train Scheduling (ACOTS and Standard Train Scheduling (STS algorithm has been performed.

  5. 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....

  6. Chemical signals associated with life inhibit necrophoresis in Argentine ants

    OpenAIRE

    Choe, Dong-Hwan; Millar, Jocelyn G.; Rust, Michael K.

    2009-01-01

    One of the most conspicuous and stereotyped activities of social insects such as ants and honey bees is necrophoresis, the removal of dead colony members from the nest. Previous researchers suggested that decomposition products such as fatty acids trigger necrophoric behavior by ant workers. However, fatty acids elicit both foraging and necrophoric responses, depending on the current nest activities (e.g., feeding or nest maintenance). Furthermore, workers often carry even freshly killed work...

  7. The Ants (Hymenoptera: Formicidae) of Jaragua National Park, Dominican Republic

    OpenAIRE

    David Lubertazzi; Gary D. Alpert

    2014-01-01

    This study examined ant species richness in Jaragua National Park (Pedernales Province, Dominican Republic). Ants were sampled at 15 sites during late March and early April, 2012. Habitats sampled included dry forest, beach scrub, lakeside acacia scrub, and thorn woodland. Sixty-four species from 23 genera were collected. Species richness was higher than expected, considering only 125 species had previously been reported for all of Hispaniola. Jaragua National Park is part of the Jaragua-Baho...

  8. Definición de una arquitectura software para dar soporte a comunidades de voluntarios en emergencias

    OpenAIRE

    Herranz Huertas, Sergio

    2015-01-01

    . La gestión de emergencias es un dominio complejo que abarca desde la prevención y preparación ante posibles situaciones de emergencias hasta la respuesta y recuperación ante las mismas. Dentro de este dominio, las comunidades de voluntarios desempeñan una labor que es considerada fundamental. Estas comunidades se componen de individuos que, movidos por un interés común por la gestión de emergencias y su efecto en la sociedad, se asocian y colaboran altruistamente con organismos y agencia...

  9. 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.

  10. Action of Ants on Vertebrate Carcasses and Blow Flies (Calliphoridae).

    Science.gov (United States)

    Paula, Michele C; Morishita, Gustavo M; Cavarson, Carolina H; Gonçalves, Cristiano R; Tavares, Paulo R A; Mendonça, Angélica; Súarez, Yzel R; Antonialli-Junior, William F

    2016-11-01

    Forensic entomology is a science that uses insect fauna as a tool to assist in criminal investigations and civil proceedings. Although the most researched insects are the Diptera and Coleoptera, ants may be present in all stages of decomposition. The aim of this study was to evaluate the role of ants and their action on blow flies during the decomposition process. Experiments were performed in which four pig carcasses were exposed in the cold and dry season (November/2012 and March/2013) and four in the hot and wet season (May/2013 and August/2013). Flies were the first insects to detect and interact with the carcasses, and six species of the Calliphoridae family were identified. Ants (Hymenoptera: Formicidae) were the second group, with six subfamilies identified. Myrmycinae represented 42% of the species, followed by Formicinae (28%), Ectatominae and Ponerinae (both 10%), and Ecitoninae and Dolichoderinae (both 5%). The ants acted on the carcasses as predators of visiting species, omnivores, and necrophagous, in all cases significantly affecting the decomposition time, slowing it down when the ants preyed on adult and immature insects consuming the carcass, or accelerating it by consuming the carcass and creating holes that could serve as gateways for the action of other organisms. The ants also generated artifacts that could lead to forensic misinterpretation.

  11. 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.

  12. 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.

  13. 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.

  14. The natural history of the arboreal ant, Crematogaster ashmeadi

    Directory of Open Access Journals (Sweden)

    Walter R. Tschinkel

    2002-07-01

    Full Text Available The arboreal ant, Crematogaster ashmeadi Emery (Hymenoptera: Formicidae, is the most dominant arboreal ant in the pine forests of the coastal plain of northern Florida. The majority of pine trees harbor a colony of these ants. The colonies inhabit multiple chambers abandoned by bark-mining caterpillars, especially those of the family Cossidae, in the outer bark of living pines. They also inhabit ground level termite galleries in the bark, often locating the queen in galleries. The density of chambers and ants is highest in the base of the tree and drops sharply with height on the trunk. Because chambers are formed in the inner layer of bark, they gradually move outward as more bark layers are laid down, eventually sloughing off the tree's outer surface. Chambers have a mean lifetime of about 25 yr. The abundant chambers in pine bark are excavated by a small population of caterpillars and accumulate over decades. Ant colonies also inhabit abandoned galleries of woodboring beetles in dead branches in the crowns of pines. Because newly mated queens found colonies in abandoned woodboring beetle galleries in the first dead branches that form on pine saplings, C. ashmeadi is dependent on cavities made by other insects throughout its life cycle, and does little if any excavation of its own. Mature colonies nest preferentially in chambers greater than 10 cm2 in area, a relatively rare chamber size. In natural pine forests, this does not seem to limit the ant's populations.

  15. 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.

  16. Weeding and grooming of pathogens in agriculture by ants.

    Science.gov (United States)

    Currie, C R; Stuart, A E

    2001-05-22

    The ancient mutualism between fungus-growing ants and the fungi they cultivate for food is a textbook example of symbiosis. Fungus-growing ants' ability to cultivate fungi depends on protection of the garden from the aggressive microbes associated with the substrate added to the garden as well as from the specialized virulent garden parasite Escovopsis. We examined ants' ability to remove alien microbes physically by infecting Atta colombica gardens with the generalist pathogen Trichoderma viride and the specialist pathogen Escovopsis. The ants sanitized the garden using two main behaviours: grooming of alien spores from the garden (fungus grooming) and removal of infected garden substrate (weeding). Unlike previously described hygienic behaviours (e.g. licking and self-grooming), fungus-grooming and garden-removal behaviours are specific responses to the presence of fungal pathogens. In the presence of pathogens, they are the primary activities performed by workers, but they are uncommon in uninfected gardens. In fact, workers rapidly eliminate Trichoderma from their gardens by fungus grooming and weeding, suggesting that these behaviours are the primary method of garden defence against generalist pathogens. The same sanitary behaviours were performed in response to the presence of the specialist pathogen Escovopsis. However, the intensity and duration of these behaviours were much greater in this treatment. Despite the increased effort, the ants were unable to eliminate Escovopsis from their gardens, suggesting that this specialized pathogen has evolved counter-adaptations in order to overcome the sanitary defences of the ants.

  17. 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...... time it takes for newly established colonies to grow to a suitable size. In this study we followed the growth of newly founded O. smaragdina colonies with 2, 3 or 4 founding queens during 12 days of development, following the transplantation of 0, 30 or 60 pupae from a mature donor colony. Colony...... growth (number of individuals) increased with increasing numbers of queens (pleometrosis) as well as with the transplantation of pupae. Transplanted pupae were accepted and developed into mature workers and not only added extra individuals to the receiver colonies but also increased the egg production...

  18. Distribution and Management of the Red Imported Fire Ant, Solenopsis invicta Buren, in Virginia

    OpenAIRE

    Allen, Hamilton Ross

    2010-01-01

    Red imported fire ant specimens were first collected in Virginia in 1989 from colonies located in Hampton, Va. Now colonies are established throughout the Hampton Roads area of Virginia. Because the fire ant is a new pest information regarding the distribution, biology, and management of the ant in Virgnia are absent. Therefore studies were conducted to compare the efficacies of four broadcast fire ant control products and an individual mound treatment to control fire ants and to determine...

  19. Effects of substrate, ant and fungal species on plant fiber degradation in a fungus-gardening ant symbiosis.

    Science.gov (United States)

    DeMilto, Alexandria M; Rouquette, Monte; Mueller, Ulrich G; Kellner, Katrin; Seal, Jon N

    2017-02-11

    Fungus-gardening or attine ants have outsourced most of their digestive function to a symbiotic fungus. The ants feed their fungus - essentially an external digestive organ - a variety of substrates of botanical origin, including fresh and dried flowers, leaves and insect frass (processed leaves). Although plant tissues are rich in fibers (lignocelluloses, hemicelluloses, pectins and starches) and the symbiotic fungus possesses the genetic and enzymatic machinery to metabolize these compounds, the highly derived attines, the leaf-cutters (Atta and Acromyrmex), are known to produce fiber-rich waste. While leaf-cutting ants are important consumers of primary plant tissue, there have been fewer studies on physiological activity of fungi grown by closely related ant species in the genus Trachymyrmex, which generally grow related species of fungi, have smaller colonies and consume a wider variety of fungal substrates in addition to fresh leaves and flowers. In this study, we measured the cellulase activity of the fungus-gardening ants Atta texana, Trachymyrmex arizonensis and T. septentrionalis. We then quantified fiber consumption of the fungus-gardening ants Trachymyrmex septentrionalis and Trachymyrmex arizonensis by comparing the amounts and percentages present in their food and in fungus garden refuse during a controlled feeding experiment over the span of several months. Finally, we compared waste composition of T. arizonensis colonies growing different fungal strains, because this species is known to cultivate multiple strains of Leucoagaricus in its native range. The leaf-cutting ant A. texana was found to have lower cellulytic activity than T. arizonensis or T. septentrionalis. Total lignocellulose and hemicellulose amounts were significantly lower in refuse piles than in the substrates fed to the Trachymyrmex colonies, thus these fibers were consumed by the fungal symbionts of these ant species. Although lignocellulose utilization was similar in two distinct

  20. El comportamiento del consumidor ante la promoción de ventas y la marca de distribuidor

    Directory of Open Access Journals (Sweden)

    Isabel Buil Carrasco

    2007-01-01

    Full Text Available En los últimos años las marcas de distribuidor y las promociones de ventas han experimentado un auge importante en nuestros mercados como consecuencia de una evolución en el consumidor. En este trabajo se analiza, a partir de una encuesta, el comportamiento de los consumidores ante las promociones y las marcas de distribuidor y se identifican cuatro grupos con diferentes niveles de respuesta. Los datos del estudio muestran como la utilización de promociones y la compra de marca de distribuidor están relacionadas, y que a pesar de ser adquiridos por un alto porcentaje de la población, existen consumidores poco sensibles hacia estas estrategias.