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Sample records for ante una pandemia

  1. 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.

  2. La gripe A en la prensa portuguesa : una pandemia medianamente controlada por las fuentes oficiales

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    Ruão, Teresa; Lopes, Felisbela; Marinho, Sandra

    2012-01-01

    En el 2009, la posibilidad de una pandemia de gripe llamo la atención de los medios. Los primeros relatos surgieron en el mes de marzo y se referían al aparecimiento de una nueva variante de la gripe humana común, en México. En abril, la Organización Mundial de la Salud (OMS) se refirió a la enfermedad como “Gripe A, H1N1” y decreto una alerta pandemica. La posibilidad de una pandemia y sus consecuencias para la población mundial se volvió asunto prioritario para las autoridades de la Salud P...

  3. 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

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

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    Abel Fernando Martínez Martín.; Bernardo Francisco Meléndez Álvarez; Edwar Javier Manrique Corredor

    2014-01-01

    Objetivo: El presente artículo, a través de las fuentes primarias, busca establecer el papel del estado y las medidas tomadas ante la aparición de la pandemia de gripa de 1918 en Bogotá. Materiales y métodos: Se consultaron como fuentes primarias los periódicos que circulaban en Bogotá y Colombia durante 1918, los informes oficiales de la Junta Central de Higiene y de la Junta de Socorros y las tesis de medicina de la Universidad Nacional de Colombia. Además de hacer una revisión de las fuent...

  5. Avances y tendencias actuales en el estudio de la pandemia de gripe de 1918-1919

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    González García, Alberto

    2013-01-01

    La pandemia de gripe que tuvo lugar entre 1918 y 1919, mal llamada Spanish flu, Spanish Lady o gripe española, es considerada la mayor catástrofe sanitaria del siglo XX, ya que produjo en menos de un año la pérdida de entre 25 y 50 millones de personas. Se realiza una revisión bibliográfica sobre los estudios más relevantes realizados hasta el momento sobre la pandemia de gripe de 1918-1919 para centrarnos específicamente en los que tienen lugar en nuestro país. La literatura sobre esta pande...

  6. 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.

  7. 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

  8. La pandemia de gripa de 1918 en Bogotá

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    Martínez Martín, Abel Fernando; MANRIQUE ABRIL, FRED GUSTAVO; Meléndez Álvarez, Bernardo Francisco

    2007-01-01

    Bogotá aportó 1900 muertos en la pandemia de gripa de 1918-1919, la más grave registrada en la historia. Pobres y desprotegidos fueron los más afectados. La atención estuvo a cargo de una entidad privada: la «Junta de Socorros». Se pretende conocer a partir de diversas fuentes primarias (principalmente, documentos oficiales, informes de la «Junta de Socorros», y prensa general y médica) cómo la gripe de 1918 alteró la dinámica social de Bogotá con particular atención a su impacto en términos ...

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

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    ELAINE RABELO NEIVA; MARIA ROS GARCIA; MARIA DAS GRAÇAS TORRES DA PAZ

    2004-01-01

    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 f...

  10. 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

  11. Control d'un teixit calefactable amb una app d'iOS mitjançant Bluetooth Low Energy

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    Vila Calvo, Albert

    2013-01-01

    El Projecte s'ha realitzat a l'empresa Cetemmsa i consisteix en el disseny d'un circuit electrònic de petites dimensions que permet controlar un teixit calefactable mitjançant un telèfon mòbil. El teixit calefactable s'escalfa fent-hi passar un corrent elèctric. La intensitat del corrent es regula mitjançant PWM i el circuit electrònic s'alimenta amb una bateria de 3.7 V. El teixit calefactable es controla remotament amb el mòbil a través d'una aplicació per al sistema operatiu pe...

  12. 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.

  13. 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.

  14. Rosas y lirios para María. Una antífona pintada

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    Pozzi, Giovanni

    2013-01-01

    El presente artículo analiza la simbología cristológico-mariana y los valores cifrados de una naturaleza muerta de carácter floral datada en el primer tercio del siglo XVII. This paper focuses upon the Christology and Marian symbols and the hidden notes of a “bodegón” of flowers (c. XVII Century: 1620-1640).

  15. 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.

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

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    Sotos Serrano, María

    2015-01-01

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

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

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    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.

  18. Estilos de afrontamiento ante una separación amorosa en personas con pérdida parental en la infancia

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    Zaragoza Toscano, Rebeca Tamar

    2007-01-01

    En esta investigación se estudió la relación entre la pérdida por muerte parental en la infancia y el tipo de afrontamiento que un individuo adulto tiene ante una separación amorosa. Se plantea el hecho de haber perdido a alguno de los padres en la infancia, como un suceso que influirá en el desarrollo de un trabajo de duelo más complicado y estilos menos asertivos de afrontar nuevas pérdidas en la adultez. La muestra estuvo conformada por 28 sujetos con pérdida parental ...

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

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    Brüggemann, Odaléa Maria; Parpinelli, Mary Angela; Osis, Maria José Duarte; Cecatti, José Guilherme; Antônio dos Santos Carvalhinho NETO

    2010-01-01

    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 ...

  20. 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

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    Abel Fernando Martínez Martín.; Juan Manuel Ospina Díaz; Fred Gustavo Manrique-Abril; Bernardo Francisco Meléndez Alvarez

    2009-01-01

    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 regi...

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

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    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”.

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

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    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.

  3. Reflexiones de una mujer antes de Hildegarda – aspectos del martirio cristiano en la obra de Rosvita von Gandersheim

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    Bragança Júnior, Álvaro Alfredo; Resende Marques, Christiane de

    2013-01-01

    Rosvita von Gandersheim (siglo X) es considerada, con anterioridad a la magistra bingensis, la primera voz femenina en la literatura en tierras de habla germana. Durante su existencia la canonesa escribió textos épicos, leyendas y seis piezas teatrales, para ser representadas en el interior de los conventos, y quizá también ante un público externo. Su cultura clásica del teatro latino, y más específicamente de Terencio, le fue bastante útil en sus textos teatrales, en los cuales el conocimien...

  4. Dos políticas para enfrentar una crisis financiera: experiencias de Méjico y Argentina ante el Tequila

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    Arnaudo, Aldo Antonio; Podzun de Buraschi, Marta Antonia

    1999-01-01

    Las transformaciones del sistema financiero para adaptarse a las peculiaridades de cada país no aparecen en forma automática, sucesiva e independiente; por el contrario, constituyen un proceso verificado a través del tiempo. Por eso es necesario analizar previamente las características específicas de cada sistema, en lugar de tomar una crisis financiera como un apéndidce de las consecuencias y de las medidas implementadas para enfrentar una crisis del sector externo. Este último enfoque resul...

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

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    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.

  6. Hey! A Fire Ant Stung Me!

    Science.gov (United States)

    ... Snowboarding, Skating Crushes What's a Booger? Hey! A Fire Ant Stung Me! KidsHealth > For Kids > Hey! A ... Me picó una roja o colorada! What's a Fire Ant? There are many different types of fire ...

  7. Efectos moduladores de la personalidad y la valoración subjetiva en la respuesta autonómica ante una tarea de hablar en público en mujeres sanas

    OpenAIRE

    Carrillo Verdejo, M. Eduvigis; Gómez Amor, Jesús; Salvador, Alicia; González-Bono, Esperanza; Ricarte, J.

    2003-01-01

    El objetivo de este estudio fue examinar en una muestra de 16 mujeres, el efecto los de rasgos de personalidad y la valoración subjetiva ante un estresor social de laboratorio (hablar en público) en la respuesta cardiovascular y electrodérmica. Se midieron las respuestas de conductancia de la piel, la frecuencia cardiaca (FC) y el volumen del pulso periférico (VPP) durante un periodo de descanso, preparación, tarea y recuperación ante un discurso académico. Los...

  8. Análisis de cadenas de Markov y series de Fourier en una secuencia hemipelágica del Jurásico superior de la Península Antártica

    OpenAIRE

    Diego A. Kietzmann; José I Cuitiño; Rubén A Medina; Roberto A. Scaso

    2009-01-01

    La Formación Ameghino (Kimmeridgiano-Berriasiano), Cuenca Larsen, Península Antártica, está compuesta por una asociación de microfacies de pelitas con radiolarios (P1), pelitas negras (P2), pelitas bioturbadas y peloidales (P3), tobas (T) y areniscas (A) excelentemente preservadas. Este conjunto de microfacies revela sedimentación pelágica/ hemipelágica en un ambiente deficiente en oxígeno, periódicamente interrumpida por caídas de cenizas del arco volcánico antártico. Análisis basados en cad...

  9. Como una caja de pandora. Contextualización y reforma universitaria ante la ambigüedad postmoderna

    Directory of Open Access Journals (Sweden)

    Juan Carlos Orozco Cruz

    1997-10-01

    Full Text Available Como un ejercicio inicial en torno al significado que revisten los procesos de Reforma Universitaria desencadenados en las instituciones colombianas a partir de 1992, se adelanta en este artículo un análisis sobre el sentido y contenido de las fases de contextualización que suelen constituir las primeras etapas de dichos procesos y frente a las cuales se asume, por regla general, una actitud desprovista de crítica, acompañada de una concepción del contexto como realidad externa que determina de manera objetiva las dinámicas institucionales.“Pensar suscita la indiferencia general. Y no obstante no es erróneo decir que se trata de un ejercicio peligroso”.G. Deleuze - F. Guattari

  10. 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

  11. 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.

  12. Ants of Colombia X. Acanthognathus with the description of a new species (Hymenoptera: Formicidae) Hormigas de Colombia X. Acanthognathus con la descripción de una nueva especie

    OpenAIRE

    JUAN PABLO GALVIS; FERNANDO FERNÁNDEZ

    2009-01-01

    A new species in the ant genus Acanthognathus, A. laevigatus n. sp., is described from the Pacific region of Colombia (Barbacoas, Nariño). A key to identify the eight species of Acanthognathus known to occur in the Neotropics is provided. In addition, the species A. brevicornis is recorded for the first time for Colombia.Se describe una nueva especie del género de hormigas Acanthognathus, A. laevigatus n. sp. de la región Pacífica de Colombia (Barbacoas, Nariño). Se provee una clave para iden...

  13. 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.

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

    OpenAIRE

    José S. Clemente-Ricolfe; Carmen Escribá-Pérez; Juan M. Buitrago-Vera

    2014-01-01

    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...

  15. Dirigentes de migrantes andinos, empleados y funcionarios públicos ante "el Estado": Una mirada desde abajo para comprender procesos políticos locales (Ciudad de Buenos Aires, Argentina)

    OpenAIRE

    Canelo Brenda

    2008-01-01

    Este trabajo explora representaciones acerca del Estado presentes entre dirigentes de migrantes del área andina central (Bolivia, Perú y noroeste argentino) residentes en la Ciudad de Buenos Aires y alrededores, quienes poseen una trayectoria de lucha política caracterizada por la fuerte interlocución con un otro al que entienden como "el Estado". Me interesa indagar cómo esas representaciones se relacionan con las prácticas que dichos dirigentes realizan ante el gobierno porteño en vistas a ...

  16. Valoración probabilística de un estadio ganglionar negativo tras cirugía de resección en el cáncer de colon. Repercusiones ante una alta probabilidad de error.

    OpenAIRE

    Martínez Ramos, David

    2008-01-01

    RESUMEN INTRODUCCIÓN. El estudio ganglionar en el cáncer de colon puede considerarse como una prueba diagnóstica, en la cual se obtiene un resultado binario (ganglios positivos o negativos). Utilizando el teorema de Bayes (TB) puede calcularse la probabilidad de afectación ganglionar cuando el estudio anatomopatológico ha resultado negativo, es decir, puede calcularse la probabilidad final de error (PFE) ante un estadio ganglionar negativo. En función de la PFE que se considere aceptable y...

  17. Ants of Colombia X. Acanthognathus with the description of a new species (Hymenoptera: Formicidae Hormigas de Colombia X. Acanthognathus con la descripción de una nueva especie

    Directory of Open Access Journals (Sweden)

    JUAN PABLO GALVIS

    2009-12-01

    Full Text Available A new species in the ant genus Acanthognathus, A. laevigatus n. sp., is described from the Pacific region of Colombia (Barbacoas, Nariño. A key to identify the eight species of Acanthognathus known to occur in the Neotropics is provided. In addition, the species A. brevicornis is recorded for the first time for Colombia.Se describe una nueva especie del género de hormigas Acanthognathus, A. laevigatus n. sp. de la región Pacífica de Colombia (Barbacoas, Nariño. Se provee una clave para identificar las ocho especies conocidas de Acanthognathus que se encuentran en el Neotrópico. Además, la especie A. brevicornis se registra por primera vez para Colombia.

  18. 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

  19. Evaluación de la intensidad y contexto de la clase de educación física antes y después de una capacitación a estudiantes de licenciatura en actividad física y deporte de la UABC

    OpenAIRE

    Hall López, Javier Arturo; Ochoa Martínez, Paulina Yesica; Chávez López, Carlos Alberto; Alarcón Meza, Edgar Ismael; Sáenz-López Buñuel, Pedro; Muñoz Alvarado, Genaro; Reyes Herrera, Jaime

    2012-01-01

    El objetivo del estudio fue evaluar la intensidad y contexto de sesiones de educación física dirigidas por estudiantes de la licenciatura en actividad física y deportes de la universidad autónoma de baja california en México, antes y después de una capacitación sistema para observar el tiempo de instrucción de actividad física (SOFIT), utilizando dicha metodología para evaluarlos, teniendo como resultado una distribución porcentual de actividad física moderada a vigorosa resulto de 37.3% ante...

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

    OpenAIRE

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

    2007-01-01

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

  1. RESPUESTA DE LOS ACADÉMICOS DE UNA UNIDAD CIENTÍFICA ANTE EL CAMBIO DE PARADIGMA EDUCACIONAL EN UNA UNIVERSIDAD CHILENA DEL CONSEJO DE RECTORES Academic answerer of a cientifc unit to a change of educacional paradigm in a chilean university of rectors council

    OpenAIRE

    CLaudio Brieba Rodríguez

    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...

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

    Directory of Open Access Journals (Sweden)

    José S. Clemente-Ricolfe

    2014-07-01

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

  3. 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...

  4. Intervención de enfermería ante la agitación de una persona discapacitada intelectual institucionalizada

    OpenAIRE

    Cánovas Rodríguez, J. M.; Hernández Ortega, R. C.

    2008-01-01

    En el presente trabajo se muestran los elementos básicos para el abordaje de un individuo con discapacidad intelectual agitado por parte del personal de enfermería. Todo ello, respaldado por un plan de cuidados de enfermería. Objetivos: Formar e informar a los profesionales de enfermería para valorar e intervenir de forma eficiente en cada caso ante un discapacitado intelectual institucionalizado. Metodología.- Revisión bibliográfica sobre el tema y exposición de las técnicas p...

  5. Intervención de enfermería ante la agitación de una persona discapacitada intelectual institucionalizada.

    OpenAIRE

    Cánovas Rodríguez, JM.; Hernández Ortega, RC.

    2008-01-01

    En el presente trabajo se muestran los elementos básicos para el abordaje de un individuo con discapacidad intelectual agitado por parte del personal de enfermería. Todo ello, respaldado por un plan de cuidados de enfermería. Objetivos: Formar e informar a los profesionales de enfermería para valorar e intervenir de forma eficiente en cada caso ante un discapacitado intelectual institucionalizado. Metodología.- Revisión bibliográfica sobre el tema y exposición de las técni...

  6. La determinación de costos como herramienta de defensa ante la globalización. El caso de una empresa de servicios agropecuarios en Sinaloa

    OpenAIRE

    Félix Susana Juárez López; Rafael Rodríguez Martínez; Héctor Manuel López Pérez; Joel López Pérez; Miguel Arenas Vargas

    2006-01-01

    La competitividad obliga a las empresas a encontrar estrategias que les permitan sobrevivir, ante la globalización de los mercados. En este ambiente de cambios, los sistemas modernos de contabilidad administrativa, entre los que sobresale el de Costos Basado en Actividades (ABC, por sus siglas en inglés), juegan un papel importante en la planeación y supervisión en los programas de reducción de costos. En este artículo se utilizaron los datos de un laboratorio de análisis de agua...

  7. La determinación de costos como herramienta de defensa ante la globalización. El caso de una empresa de servicios agropecuarios en Sinaloa

    OpenAIRE

    Félix Susana Juárez López; Rafael Rodríguez Martínez; Héctor Manuel López Pérez; Joel López Pérez; Miguel Arenas Vargas

    2006-01-01

    La competitividad obliga a las empresas a encontrar estrategias que les permitan sobrevivir, ante la globalización de los mercados. En este ambiente de cambios, los sistemas modernos de contabilidad administrativa, entre los que sobresale el de Costos Basado en Actividades (ABC, por sus siglas en inglés), juegan un papel importante en la planeación y supervisión en los programas de reducción de costos. En este artículo se utilizaron los datos de un laboratorio de análisis de a...

  8. Construcció d'una comunitat d'aprenentatge mitjançant la utilització de col·laboració i tecnologia

    Directory of Open Access Journals (Sweden)

    Graciela Vidal

    2013-06-01

    Full Text Available L'objectiu de l'article és presentar una experiència educativa de col.laboració per crear una comunitat d'aprenentatge composta dels estudiants i la professora. Aquesta comunitat es va formar en un curs de comunicació oral de nivell avançat d'espanyol a la Duke University en treballar de forma cooperativa en la creació de contingut i en participar els estudiants en certes decisions sobre l'avaluació d'una tasca. La combinació d'estratègies col.laboratives i tecnològiques utilitzades van crear un ambient on es van millorar destreses lingüístiques, discursives i, al mateix temps, es va crear una plataforma on es va facilitar el pensament crític. Aquesta experiència educativa va transformar els rols dels estudiants i de la professora per permetre una màxima col.laboració i integració dels seus rols.

  9. Antígona y la muerte

    OpenAIRE

    Pérez Alcolea, Simona Micaela

    2012-01-01

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

  10. 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.

  11. Derechos humanos y convivencia en la comunidad educativa: acción - reacción ante una crisis de humanidad

    OpenAIRE

    Torquemada de la Hoz, Gonzalo

    2014-01-01

    Al explorar el tema de los Derechos Humanos y su Educación, encontramos gran variedad de programas, piezas normativas, actuaciones, proyectos e informes; una extensa lista de documentación relacionada directa o indirectamente con el tema. El objeto de nuestra investigación radica precisamente en encontrar una adecuación de todas estas variables en un denominador común que favorezca su interacción armónica, para generar un proceso de humanización acorde con las necesidades a las que nos enfren...

  12. 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....

  13. Nota histórica: una conferencia de José María Albareda ante las autoridades académicas alemanas

    Directory of Open Access Journals (Sweden)

    Presas i Puig, Albert

    1998-08-01

    Full Text Available Not available.Al término de la guerra civil y después de la restructuración político estratégica que siguió a la II Guerra Mundial, el régimen franquista realizó un esfuerzo de integración paulatina al exterior, esfuerzo del que también participó el CSIC. Esta conferencia de Albareda es una muestra de la voluntad de las autoridades científicas españolas para recuperar unas relaciones con la nueva Alemania interrumpidas por los conflictos bélicos, viéndose cuál era la estrategia y la imagen que se intentaba dar al exterior de la tradición científica española, en algunos aspectos muy distante del discurso oficial en el interior del país.

  14. 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

  15. 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.

     

  16. Personalidad y respuesta inmune al antígeno de la hepatitis A y B desde una perspectiva psicoinmunológica

    OpenAIRE

    Fusté Escolano, Adela

    1996-01-01

    [spa] Algunas personas se recuperan con cierta rapidez de las mismas enfermedades y trastornos que a otras causan largos períodos de convalecencia y/o inconveniencias familiares y laborales. Tampoco es extraño encontrar personas que a lo largo de su vida manifiestan una sorprendente predisposición a padecer enfermedades víricas como la gripe, sinusitis, hepatitis o el herpes, mientras que otras, aún estando expuestas a esos mismos virus, no sucumben a tales infecciones, permaneciendo completa...

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

    OpenAIRE

    Miriam Paula Marcos Espino; Eva Tizón Bouza

    2013-01-01

    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, a...

  18. 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)

  19. 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

  20. 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

    OpenAIRE

    R. Bosch Robaina; M. Rubio Alonso; F. García Hoyos

    2012-01-01

    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 consis...

  1. Fire Ant Bites

    Science.gov (United States)

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

  2. 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

    2013-12-01

    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.

  3. 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.

  4. Una reconsideración de las garantías electorales ante las nuevas modalidades de (e- votación

    Directory of Open Access Journals (Sweden)

    María Vicenta García Soriano

    2007-07-01

    Full Text Available La utilización de las nuevas tecnologías se identifica con el progreso de las sociedades, por ello su incorporación al proceso electoral se ha venido considerando como un avance. Sin embargo, la introducción de las Tecnologías de Información y Comunicación (TIC ha generado una serie de cambios que no debería desembocar en un menoscabo de las garantías que rodean el sufragio activo y pasivo. El artículo replantea cuestiones relativas a creación de censos electrónicos, competencias de la Administración Electoral, calificación de quienes la integran, utilización de los medios informáticos en las campañas electorales así como la nueva regulación de las garantías al “e-voto” y el escrutinio.

  5. Latinoamérica ante las ciencias de la naturaleza y del medio ambiente: Materiales para una reflexión histórica

    Directory of Open Access Journals (Sweden)

    Mario Zunino

    2007-01-01

    Full Text Available El autor desea resaltar la importancia de la literatura naturalista latinoamericana, la cual es tan pobremente reconocida dentro del medio científico italiano. Se consideran como ejemplos paradigmáticos, las contribuciones novedosas de dos científicos y pensadores contemporáneos, Eduardo H. Rapoport de Argentina, y Gonzálo Halffter de México. Acerca de E. Rapoport, el autor discute sus ideas respecto de las estrategias geográficas de las especies y el fenómeno de contaminación biogeográfico. Con respecto a G. Hallter, el autor subraya su trayectoria científica y filosófica hacia una síntesis entre los factores ecológicos e históricos de la evolución biológica, junto con su enfoque a los problemas de conservación global y las estrategias de manejo de recursos naturales -especialmente remarcando el modelo de Reservas de la Biósfera de Halffter. Se proporciona un análisis resumido del panorama histórico sobre el enfoque original latinoamericano. Finalmente, el autor hace hincapié del riesgo en el mundo contemporáneo por la pérdida de diversidad cultural y la consecuente necesidad de incrementar las interacciones científicas entre Italia y América Latina.

  6. 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

  7. 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

  8. La gripe en el cine. De la enfermedad aparentemente banal a la pandemia apocalíptica

    OpenAIRE

    García Sánchez, José Elías; García Sánchez, Enrique

    2006-01-01

    La editorial de este número de la "Revista Medicina y Cine" nos muestra la inclusión de la gripe en las tramas de algunas películas, bien en su forma habitual, banal, o en su forma pandémica, responsable de una elevada mortalidad.

  9. Ant colony for TSP

    OpenAIRE

    Feng, Yinda

    2010-01-01

    The aim of this work is to investigate Ant Colony Algorithm for the traveling 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. This paper is based on the ideas of ant colony algorithm and analysis the main parameters of the ant colony algorithm. Experimental results for solving TSP problems with ant colony algorithm show great...

  10. Velvet Ants: Hymenoptera: Mutillidae

    OpenAIRE

    Dellinger, Theresa A.; Day, Eric R.

    2012-01-01

    Describes Velvet Ants, their life cycle, habitats, and discusses control if necessary, although they are generally not regarded as pests. Caution is noted in handling velvet ants, since their stings are very painful.

  11. Anàlisi. Disseny i implementació d'una utilitat de Workflow aplicat a una web de gestió d'un centre de Reclamacions i Queixes mitjançant J2EE : una solució amb Struts i EJBs

    OpenAIRE

    Balagué Sans, Jaume

    2008-01-01

    El treball final de carrera està compost de l¿anàlisi, disseny i implementació d'una utilitat de Workflow que dóna servei a una web per gestionar les reclamacions i queixes d'una empresa. La part del Workflow s'ha pensat per ser totalment configurable a les particularitats d'un determinat aplicatiu i per donar servei a tantes aplicacions com faci falta simultàniament. L'anàlisi i el disseny s'han basat en la metodologia UML dins el paradigma de l'Orientació a Objectes juntament amb diverso...

  12. ACO - Ant Colony Optimization

    OpenAIRE

    Žumer, Viljem; Brest, Janez; Pešl, Ivan

    2015-01-01

    Ant colony optimization is a relatively new approach to solving NP-Hard problems. It is based on the behavior of real ants, which always find the shortest path between their nest and a food source. Such behavior can be transferred into the discrcte world, were real ants are replaced by simple agents. Such simple agents are placed into the environment where different combinatorial problems can be solved In this paper we describe an artificial ant colony capable of solving the travelling salesm...

  13. Antes del analizante (Freud 1877-1888)

    OpenAIRE

    Pierre Bruno

    2011-01-01

    Freud antes del analizante, es decir, antes de encontrarse con Fliess. Durante ese periodo, de 1877 a 1888 (entre los 21 y los 32 años de edad), Freud mantiene una relación con cinco “campos del saber”: la histología, la cocaína, la histeria, la hipnosis y la afasia. La lectura de esos textos nos permite hacer el seguimiento de cómo Freud se separa de la neurología sin afiliarse a la psicología. Palabras clave: afasia, Freud, hipnosis, histeria, neurolog...

  14. Dirigentes de migrantes andinos, empleados y funcionarios públicos ante "el Estado": Una mirada desde abajo para comprender procesos políticos locales (Ciudad de Buenos Aires, Argentina

    Directory of Open Access Journals (Sweden)

    Canelo Brenda

    2008-07-01

    Full Text Available Este trabajo explora representaciones acerca del Estado presentes entre dirigentes de migrantes del área andina central (Bolivia, Perú y noroeste argentino residentes en la Ciudad de Buenos Aires y alrededores, quienes poseen una trayectoria de lucha política caracterizada por la fuerte interlocución con un otro al que entienden como "el Estado". Me interesa indagar cómo esas representaciones se relacionan con las prácticas que dichos dirigentes realizan ante el gobierno porteño en vistas a alcanzar objetivos cuyo sentido también se vincula con esa particular imagen del Estado. Asimismo, examino el significado del Estado para empleados y funcionarios públicos del GCBA con quienes esos dirigentes interactúan, cómo esa idea se liga con su práctica cotidiana al interior de instituciones estatales y cómo, en definitiva, ponen en acción al Estado orientados por esas representaciones, constreñidos por diversas regulaciones y condiciones materiales y demandados por los agentes sociales con quienes su trabajo los vincula.Este artigo explora as representações sobre o Estado presentes entre os líderes dos emigrantes da região dos Andes Centrais (Bolívia, Peru e noroeste da Argentina residentes na cidade e nos subúrbios de Buenos Aires. Estes líderes têm um histórico de luta política marcado por uma forte interlocução entre eles e o que compreendem como "o Estado". Meu interesse é investigar como estas representações se relacionam com as práticas executadas por estes líderes perante o governo desta cidade, a fim de conseguir objetivos, cujo sentido esteja ligado também a essa imagem particular de Estado. Ademais, examino o significado do Estado para empregados e funcionários públicos do GCBA com quem estes líderes interagem, como essa idéia é ligada com sua prática diária dentro das instituições do Estado e como, orientados por estas representações, confinados por vários regulamentos e por circunst

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

    Science.gov (United States)

    Greenfield, Gary; Machado, Penousal

    2015-01-01

    Ant- and ant-colony-inspired ALife art is characterized by the artistic exploration of the emerging collective behavior of computational agents, developed using ants as a metaphor. We present a chronology that documents the emergence and history of such visual art, contextualize ant- and ant-colony-inspired art within generative art practices, and consider how it relates to other ALife art. We survey many of the algorithms that artists have used in this genre, address some of their aims, and explore the relationships between ant- and ant-colony-inspired art and research on ant and ant colony behavior. PMID:26280070

  16. Ant Colony Optimization

    OpenAIRE

    Zahálka, Jaroslav

    2007-01-01

    This diploma thesis deals with Ant Colony algorithms and their usage for solving Travelling Salesman Problems and Vehicle Routing Problems. These algorithms are metaheuristics offering new approach to solving NP-hard problems. Work begins with a description of the forementioned tasks including ways to tackle them. Next chapter analyses Ant Colony metaheuristic and its possible usage and variations. The most important part of the thesis is practical and is represented by application Ant Colony...

  17. 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

    OpenAIRE

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

    2007-01-01

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

  18. 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.

  19. Antes del Diseño

    OpenAIRE

    Javier González Solas

    2014-01-01

    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...

  20. Ant Ballet: Phase I

    OpenAIRE

    Ollie Palmer

    2014-01-01

    The Ant Ballet project aims to create a precisely choreographed movement from a colony of ants through the use of artificial pheromones. This article presents an annotated storyboard of the film that documents the first set of experiments within the project. The full film can be viewed online at href="http://www.antballet.org"www.antballet.org.

  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. 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)

  3. 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...

  4. The Cocktail ant count

    International Nuclear Information System (INIS)

    A better understanding of Cocktail ant populations (Crematogaster) is engendered by the use of 32P labelling to measure the population density of the colonies, once the biology of the species is known

  5. Ant traffic rules.

    Science.gov (United States)

    Fourcassié, Vincent; Dussutour, Audrey; Deneubourg, Jean-Louis

    2010-07-15

    Many animals take part in flow-like collective movements. In most species, however, the flow is unidirectional. Ants are one of the rare group of organisms in which flow-like movements are predominantly bidirectional. This adds to the difficulty of the task of maintaining a smooth, efficient movement. Yet, ants seem to fare well at this task. Do they really? And if so, how do such simple organisms succeed in maintaining a smooth traffic flow, when even humans experience trouble with this task? How does traffic in ants compare with that in human pedestrians or vehicles? The experimental study of ant traffic is only a few years old but it has already provided interesting insights into traffic organization and regulation in animals, showing in particular that an ant colony as a whole can be considered as a typical self-organized adaptive system. In this review we will show that the study of ant traffic can not only uncover basic principles of behavioral ecology and evolution in social insects but also provide new insights into the study of traffic systems in general. PMID:20581264

  6. Concordancia del resultado del PASI (Psoriasis Area and Severity Index) entre dermatólogos sin entrenamiento comparado con dermatólogos expertos antes y después de recibir una capacitación en la aplicación de la escala en pacientes con psoriasis en el hospital Universitario la Samaritana durante el periodo comprendido entre octubre del 2015 y diciembre de 2015

    OpenAIRE

    Moreno Corredor, María Cristina

    2016-01-01

    No se encontraron estudios que comparen los resultados de PASI entre personal entrenado y personal no entrenado. Objetivo: Determinar la concordancia del resultado del PASI (Psoriasis Area and Severity Index) entre dermatólogos sin entrenamiento antes y después de recibir una capacitación en la aplicación de la escala comparado con dermatólogos expertos en pacientes con psoriasis en el hospital Universitario la Samaritana durante el periodo comprendido entre octubre del 2015 y diciembre de...

  7. 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

  8. El materialisme com a antídot als subterfugis ontològics : «Contra filósofos: O ¿en qué se diferencia una mujer de un gato?»

    OpenAIRE

    Armengol Sans, Andrés

    2015-01-01

    La present nota crítica proposa realitzar un breu recorregut per les línies argumentatives generals de la darrera obra de Mercè Rius, Contra filósofos: O ¿en qué se diferencia una mujer de un gato? Partint d’una perspectiva històrica i filosòfica, l’autora s’endinsa en les arrels polítiques que han sustentat l’universalisme excloent del discurs filosòfic d’ençà de la metafísica platònica i artistotèlica, palesant l’arrelament biopolític de les suposades justificacions de caire misogin contra ...

  9. Caracterización de la microestructura de una aleación de Ti libre de Ni con memoria de forma y bajo módulo para aplicaciones biomédicas ante diferentes velocidades de enfriamiento

    OpenAIRE

    Isa Martin, Alejandro

    2010-01-01

    En aquest projecte s’ha caracteritzat una aleació de titani sense níquel disenyada per tenir un baix mòdul elàstic i/o memòria de forma, destinada a ser utilitzada per la creació d’implants biomèdics. La aleació va ser dissenyada per Marta González per una tesis actualment en curs. S’ha realitzat un estudi de l’art sobre materials similars ja estudiats al llarg de la história en implantología, amb l’objectiu d’entendre i justificar l’efecte de la transformació martensítica en les propietat...

  10. Incesto: una plaga silenciada

    OpenAIRE

    Yamileth Ramírez Rodríguez

    2003-01-01

    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 ...

  11. 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...

  12. 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.

  13. 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.

  14. Alate susceptibility in ants.

    Science.gov (United States)

    Ho, Eddie K H; Frederickson, Megan E

    2014-11-01

    Pathogens are predicted to pose a particular threat to eusocial insects because infections can spread rapidly in colonies with high densities of closely related individuals. In ants, there are two major castes: workers and reproductives. Sterile workers receive no direct benefit from investing in immunity, but can gain indirect fitness benefits if their immunity aids the survival of their fertile siblings. Virgin reproductives (alates), on the other hand, may be able to increase their investment in reproduction, rather than in immunity, because of the protection they receive from workers. Thus, we expect colonies to have highly immune workers, but relatively more susceptible alates. We examined the survival of workers, gynes, and males of nine ant species collected in Peru and Canada when exposed to the entomopathogenic fungus Beauveria bassiana. For the seven species in which treatment with B. bassiana increased ant mortality relative to controls, we found workers were significantly less susceptible compared with both alate sexes. Female and male alates did not differ significantly in their immunocompetence. Our results suggest that, as with other nonreproductive tasks in ant colonies like foraging and nest maintenance, workers have primary responsibility for colony immunity, allowing alates to specialize on reproduction. We highlight the importance of colony-level selection on individual immunity in ants and other eusocial organisms. PMID:25540683

  15. 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.

  16. The Ants Go Marching Millions by Millions: Invasive Ant Research

    Science.gov (United States)

    Invasive ants are a worldwide problem that is expanding both geographically and in intensity. Population explosions of invasive ants can overrun landscapes and inundate structures. Pest management professionals are often the first responders to complaints about invading ants. This session will fo...

  17. Análisis de respuestas fisiológicas, emocionales y conductuales, ante el estímulo musical en una muestra de jóvenes universitarios

    OpenAIRE

    Gigante Pérez, Crispín

    2013-01-01

    La investigación aquí presentada ofrece un amplio estudio derivado de la audición musical y su influencia sobre importantes aspectos fisiológicos,emocionales y conductuales. La audición musical o escucha activa, objeto de esta tesis, puede encuadrarse dentro de la fundamentación teórica de la Musicoterapia receptiva (MTr) y, presenta como novedad la audición de dos archivos musicales muy diferentes y el estudio de las respuestas que han generado cada uno de ellos en una muestra de jóvenes ...

  18. Ilegitimidad de la descoordinación como política exterior estadounidense : Perspectiva cambio/continuidad de una PE antes/después del 9/11 con relación a la CPI

    OpenAIRE

    Guevara, Camilo

    2002-01-01

    La H1 es Apocalíptica y metodológicamente es determinista; la descoordinación del sistema jurídico multilateral es un objetivo, que una vez triunfante, puede ser extensible a todo el sistema colectivo. Por ende el corto plazo de organización de TPI resulta determinante, y los retaceos que la PE estadounidense pongan a su ejercicio, determinaran altos índices de injusticias no-juzgadas. Dada la necia política de desarrollo capitalista salvaje y egoísta, que conlleva un militarismo extremo e...

  19. Una lección metodológica en el estudio de la Economía. “La profesora Robinson 40 años antes de Bolonia”

    OpenAIRE

    Iglesia Villasol, Covadonga de la

    2009-01-01

    Este es un momento decisivo para la Universidad Española, que tiene las puertas abiertas al proceso de convergencia europea con el horizonte temporal de 2010, y se encuentra inmersa en el diseño y puesta en marcha de los nuevos estudios de grado, la adaptación metodológica, el reconocimiento de créditos docentes o no, y la configuración del Suplemento Europeo al Título, etc. El trabajo plantea una reflexión sobre algunos aspectos metodológicos acerca de cómo abordar el proceso de enseñanza...

  20. Los orígenes de una ciudad olímpica: Barcelona y el asociacionismo deportivo decimonónico ante la gestación de los primeros Juegos Olímpicos

    OpenAIRE

    Torrebadella i Flix, Xavier

    2012-01-01

    A mediados del siglo XIX Barcelona emprendió un acelerado proceso de expansión industrial y empresarial que la consolidó como la ciudad más próspera de España. Esta posición provocó la presencia de una elevada colonia extranjera europea, que asimismo participó del asociacionismo recreativo del llamado sport. Los vínculos entre la elitista colonia extranjera y la emergente burguesía de Barcelona facilitaron la puesta en marcha de un fenómeno asociativo de signo liberal sin precedentes que tomó...

  1. 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.

  2. 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

  3. 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...

  4. 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…

  5. LAS DIFICULTADES DE FINANCIACIÓN DE LAS EMPRESAS DE PARTICIPACIÓN ANTE LA CRISIS ECONÓMICA: LA CREACIÓN DE UNA ENTIDAD FINANCIERA DE CRÉDITO COMO ALTERNATIVA / THE FINANCIAL DIFFICULTIES OF THE LABOUR MANAGED FIRMS BECAUSE OF THE ECONOMIC CRISIS: THE CREATION OF A FINANCIAL ORGANIZATION

    Directory of Open Access Journals (Sweden)

    Sonia MARTÍN LÓPEZ

    2010-01-01

    Full Text Available La crisis económica está teniendo una importante repercusión en el tejido empresarial español, de tal forma que cada vez son menos el número de nuevas empresas que se constituyen, y más aquellas, que ya encontrándose operativas en el mercado, se ven abocadas al cierre, y a su disolución. Las empresas que se han visto afectadas en mayor medida son la de menor dimensión, quienes ven peligrar su viabilidad futura, debido a la falta de liquidez y acceso al crédito, como consecuencia de las malas prácticas del sector financiero internacional. En el caso de las empresas de participación, caracterizadas por su reducida dimensión, el hecho de ser empresario individual, o socio de una cooperativa de trabajo asociado o sociedad laboral, lleva implícito la condición de financiador de la misma, actuando como banquero. Por lo que, ante el problema de la falta de liquidez, se plantea como alternativa el estudio de la creación de una entidad financiera de crédito por parte de estas empresas. / The economic crisis is having an important repercussion in the Spanish enterprises. The number of new companies are less, and the number of those that already being operative in the market and have to close is increasing. The companies that have been affected more are the smallest, who had seen in danger their future viability, due to the lack of liquidity and access on the credit, as a result of the bad practices of international financial sector. In the case of the labour managed firms, characterized by their small size, the fact of being and individual entrepreneur, or partner of a cooperative of associate work or employee-owned company, implies to be a financier. Because of that, due to the problem of the lack of liquidity, the study of the creation of a financial organization by these companies could be an alternative.

  6. Aprendiendo a trabajar en conjunto. El laboratorio de mejora de practicas escolares y colaboración entre enseñantes: una experiencia de investigación, formación y acción reflexiva en una escuela del nivel medio superior en México.

    OpenAIRE

    BRITO RIVERA, HUGO ARMANDO

    2014-01-01

    Esta tesis destaca una experiencia de formación no canónica cuyo objetivo ha sido desarrollar competencias profesionales a las que suele darse máxima importancia pero de cuyos procesos se conoce poco (p. ej. la colaboración). Se exponen los resultados obtenidos del Laboratorio de mejora de prácticas escolares realizado entre agosto 2011 y junio 2012 con docentes de una escuela preparatoria en el Estado de México. El estudio, posicionado desde la psicología cultural de las organizaciones y la ...

  7. Ant Colony Optimization: A Review and Comparison

    OpenAIRE

    Sundus Shaukat; Riaz Ahmed Bhatti; Khalid Ibrahim Qureshi; Shafqat Ali Shad

    2014-01-01

    Many optmization algorithms are developed over period of time, among these most famous and widely used is Ant Colony systems (ACA). Ant Colony Systems (ACS) are the collection of different ant colony optimization algorithms. Different algorithms are used for solve the Travelling salesmen Problem (TCP) but ant colony algorithm is more preferred to solve the travelling salesmen problem. In ant colony best solution is found with the help of cooperating agents called ants. Ants cooperate with eac...

  8. Antártida

    OpenAIRE

    Ricardo Felicio

    2007-01-01

    No extremo Sul do planeta Terra há a última fronteira ao avanço e controle total do homem. Se já são tantas as dificuldades para a sobrevivência em um ambiente hostil, podemos imaginar o esforço maior para a permanência total e indefinida. Tal território, sempre idealizado pelos antigos gregos, cerca de 300 a.C., mas descoberto há pouco mais de um século é a Antártida. Suas diferenças são marcantes em relação ao seu par, no pólo Norte, em todos os sentidos. O mais importante é o fato de a Ant...

  9. 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.

  10. Alate susceptibility in ants

    OpenAIRE

    Ho, Eddie K H; Frederickson, Megan E

    2014-01-01

    Pathogens are predicted to pose a particular threat to eusocial insects because infections can spread rapidly in colonies with high densities of closely related individuals. In ants, there are two major castes: workers and reproductives. Sterile workers receive no direct benefit from investing in immunity, but can gain indirect fitness benefits if their immunity aids the survival of their fertile siblings. Virgin reproductives (alates), on the other hand, may be able to increase their investm...

  11. Artificial Ant Species on Solving Optimization Problems

    OpenAIRE

    Pintea, Camelia-M.

    2013-01-01

    During the last years several ant-based techniques were involved to solve hard and complex optimization problems. The current paper is a short study about the influence of artificial ant species in solving optimization problems. There are studied the artificial Pharaoh Ants, Lasius Niger and also artificial ants with no special specificity used commonly in Ant Colony Optimization.

  12. Mechanics of fire ant aggregations

    Science.gov (United States)

    Tennenbaum, Michael; Liu, Zhongyang; Hu, David; Fernandez-Nieves, Alberto

    2016-01-01

    Fire ants link their bodies to form aggregations; these can adopt a variety of structures, they can drip and spread, or withstand applied loads. Here, by using oscillatory rheology, we show that fire ant aggregations are viscoelastic. We find that, at the lowest ant densities probed and in the linear regime, the elastic and viscous moduli are essentially identical over the spanned frequency range, which highlights the absence of a dominant mode of structural relaxation. As ant density increases, the elastic modulus rises, which we interpret by alluding to ant crowding and subsequent jamming. When deformed beyond the linear regime, the aggregation flows, exhibiting shear-thinning behaviour with a stress load that is comparable to the maximum load the aggregation can withstand before individual ants are torn apart. Our findings illustrate the rich, collective mechanical behaviour that can arise in aggregations of active, interacting building blocks.

  13. Further travels with my ant

    OpenAIRE

    Gale, David; Propp, James; Sutherland, Scott; Troubetzkoy, Serge

    1995-01-01

    We discuss some properties of a class of cellular automata sometimes called a "generalized ant". This system is perhaps most easily understood by thinking of an ant which moves about a lattice in the plane. At each vertex (or "cell"), the ant turns right or left, depending on the the state of the cell, and then changes the state of the cell according to certain prescribed rule strings. (This system has been the subject of several Mathematical Entertainments columns in the Mathematical Intelli...

  14. Chemically armed mercenary ants protect fungus-farming societies

    OpenAIRE

    Adams, R. M. M.; Liberti, J.; Illum, A. A.; Jones, T H; Nash, D R; Boomsma, J.J.

    2013-01-01

    We document the behavioral interactions among three ant species: a fungus-growing host ant, a permanently associated parasitic guest ant, and a raiding agro-predator ant. We show that the presence of guest ants becomes advantageous when host ants are attacked by raider ants, because guest ants use alkaloid venom to defend their host ant colony. Furthermore, detection of the guest ant odors is sufficient to discourage raider scouts from recruiting nestmates to host colonies. Guest ants likely ...

  15. 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.

  16. La pandemia subvalorada del siglo XXI: el virus del papiloma humano. Su repercusión en la patogenia del cáncer cervicouterino

    Directory of Open Access Journals (Sweden)

    Adrian Zelada-Valdés

    2013-01-01

    Full Text Available El presente milenio ha arribado con nuevos retos para la medicina moderna. Uno de esos desafíos es la infección por el virus del papiloma humano (VPH y su relación con la patogenia de varios tipos de neoplasias, entre las cuales se encuentran el cáncer cervicouterino (CCU, orofaringe, pene, vulva y vagina. Con el desarrollo de nuevas técnicas para la detección y tipificación del VPH se pudo determinar su presencia en más de un 99 % de las biopsias de las pacientes con cáncer del cérvix. Además, existen aproximadamente 200 tipos de papilomas humanos, de los cuales 40 infectan el tracto genital, siendo los tipos 6, 11, 16 y 18 los de mayor importancia epidemiológica. Asimismo, el CCU ocupa el segundo lugar de prevalencia de todas las neoplasias presentes en la mujer a nivel global y es la quinta causa de muerte por cáncer en esta población. Además, cada año se diagnostican aproximadamente 500 000 nuevos casos y de ellos, casi la mitad de las pacientes fallecerán. Entre los años 2006 y 2008, salieron al mercado dos vacunas preventivas contra el VPH (Gardasil y Cervarix, mostrando una eficacia de casi un 100 %. Sin embargo, estas vacunas son muy costosas para países en desarrollo. El objetivo del presente manuscrito es realizar una revisión del VPH y su relación con el CCU, así como su situación epidemiológica global y nacional y las posibles vías de prevención y tratamiento.

  17. Fire ant microsporidia acquired by parasitoid flies of fire ants

    Science.gov (United States)

    The microsporidium Kneallhazia (formerly Thelohania) solenopsae and parasitoid flies in the genus Pseudacteon are natural enemies of the invasive fire ant, Solenopsis invicta. Pseudacteon flies oviposit into adult fire ants, where maggots that eclose from eggs migrate to the ants’ head, pupate, and...

  18. Ex Ante Allusions

    OpenAIRE

    Holt, Jason

    2015-01-01

    We tend to think of allusions as indirect references to objects that already exist. Here I argue against this post facto orthodoxy and for the view that certain cases of allusion count as ex ante allusions (i.e. allusions before the fact). I argue that the standard view conflates the epistemic dependence of allusion (knowledge of the object of allusion) with an existential dependence (the object must already exist). As an adequate account of allusion should explain both the apparent paradoxic...

  19. Army Ants as Research and Collection Tools

    OpenAIRE

    Smith, Adrian A.; Haight, Kevin L.

    2008-01-01

    Ants that fall prey to the raids of army ants commonly respond by evacuating their nests. This documented behavior has been underexploited by researchers as an efficient research tool. This study focuses on the evacuation response of the southwestern desert ant Aphaenogaster cockerelli André (Hymenoptera: Formicidae) to the army ant Newamyrmex nigrescens Cresson. It is shown that army ants can be used to collect mature colonies of ants. The applicability of this tool to ecologically meaningfu...

  20. APORTACIONES DIDÁCTICAS EN LOS LIBROS DE TEXTO Y SU RELACIÓN CON LA ANSIEDAD ANTE EL APRENDIZAJE DE UNA LENGUA EXTRANJERA : Una exploración cualitativa de tres libros de texto de español como lengua extranjera paso 1 de educación secundaria

    OpenAIRE

    Carlos Valladares Segovia, Juan

    2016-01-01

    El objetivo de este trabajo es identificar qué competencias generales y qué competencias comunicativas, según el enfoque comunicativo, se promueven en tres libros de texto de español como lengua extranjera y determinar su relación con la variable afectiva de la ansiedad. Para alcanzar los planteamientos de nuestra investigación utilizamos una aproximación cualitativa, empleando el cuestionario de análisis NAKIBAR 2004 perteneciente al trabajo de investigación realizado por Joseba Ezeiza Ramos...

  1. 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.

  2. Pandemia de gripe A (H1N1: estrategia de vigilancia y vacunación en las Fuerzas Armadas Pandemic of swine flu (H1N1: strategies for surveillance and immunization in the Armed Forces

    Directory of Open Access Journals (Sweden)

    G.G. Cáceres Bermejo

    2011-12-01

    Full Text Available Las Fuerzas Armadas constituyen un colectivo de interés especial en cuanto a la vigilancia y prevención de la gripe. El objetivo de este trabajo es describir las medidas de Salud Pública adoptadas frente a la pandemia de gripe A (H1N1. Se elaboraron protocolos de actuación específicos, tanto en vigilancia epidemiológica como en vacunación, en territorio nacional y en zona de operaciones. El número de casos notificados de gripe A fue de 1223 (el 57,5% en el Ejército de Tierra, 10 necesitaron hospitalización, y no se produjo ninguna defunción. Se distribuyeron 67.800 vacunas pandémicas y la cobertura fue del 9,7%, la Unidad Militar de Emergencias fue donde se conseguieron coberturas más altas (45,9%. Se notificaron 613 efectos adversos a la vacunación, todos ellos fueron leves.The Armed Forces constitute a group of special interest for the surveillance and the prevention of influenza. The aim of this paper is to describe the public health measures taken in response to pandemic of Influenza A (H1N1. Specific protocols of action were designed for the epidemiological surveillance and the vaccination, for national territory and operation areas. The reported cases of Influenza A were 1223 (57,5% in the Army, 10 have required hospitalization, and no death has taken place. 67800 pandemic vaccines have been distributed and the coverage reached 9,7 %, the highest coverage of vaccination (45,9% was obtained in the UME (Emergencies Military Unit. 613 adverse effects to the vaccination were reported, but all of them were slight.

  3. 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 of th...... 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...... 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...

  4. AntR-mediated bidirectional activation of antA and antR, anthranilate degradative genes in Pseudomonas aeruginosa.

    Science.gov (United States)

    Kim, Soo-Kyoung; Im, Su-Jin; Yeom, Doo-Hwan; Lee, Joon-Hee

    2012-08-15

    Bidirectional activation of transcription is a peculiar regulation mode of gene expression. In this study, we show that genes involved in the metabolism of anthranilate, a precursor of biosynthesis of tryptophan and Pseudomonas quinolone signal (PQS) are regulated by this bidirectional activation of transcription. Anthranilate is degraded by anthranilate dioxygenase complex encoded by antABC operon, and AntR, a LysR-type regulator encoded by antR activates the transcription of antABC operon in the presence of anthranilate. In P. aeruginosa, antABC and antR are divergently located and AntR binds to the intergenic region between antA and antR to activate the antABC transcription. In this study, we determined the transcriptional start site of the antA promoter (antA(p)) and AntR-responsive elements (AREs) in P. aeruginosa. The upstream deletion analysis of antA(p) and in vitro gel shift assay with purified AntR showed that there are two AREs at -194 to -148 and -88 to -47 regions. We also found that AntR activates antR promoter (antR(p)) in the opposite direction and both AREs are important in the bidirectional activation of antA(p) and antR(p). Two AREs have different binding affinities to AntR and the strength of transcriptional activation was dramatically asymmetric depending on the direction. We suggest that the different affinities of two AREs may explain the asymmetry of the bidirectional activation by AntR. PMID:22609066

  5. 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.

  6. 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

  7. La hipnosis de las pantallas: reflexiones ante un posible despertar del telespectador

    OpenAIRE

    Portillo García, Aurelio del

    2005-01-01

    Se observa cómo la disposición del telespectador ante las pantallas es de alguna forma una entrega psíquica ante una representación de la que, con demasiada facilidad, no se cuestiona su nivel de realidad y/o veracidad ni se valora de forma selectiva el interés o calidad de su contenido. Es evidente que la forma de ver televisión, como lo es la de leer o escuchar música, depende de un proceso de aprendizaje que se ha obviado encubierto por la cotidianidad omnipresente del televisor, ...

  8. Ants for Document Clustering

    Directory of Open Access Journals (Sweden)

    Priya Vaijayanthi

    2012-03-01

    Full Text Available The usage of computers for mass storage has become mandatory nowadays due to World Wide Web (WWW. This has placed many challenges to the Information Retrieval (IR system. Clustering of documents available improves the efficiency of IR system. The problem of clustering has become a combinatorial optimization problem in IR system due to the exponential growth in information over WWW. In this paper, a hybrid algorithm that combines the basic Ant Colony Optimization with Tabu search has been proposed. The feasibility of the proposed algorithm is tested over a few standard benchmark datasets. The experimental results reveal that the proposed algorithm yields promising quality clusters compared to other ones produced by K-means algorithm.

  9. Importancia de Proteger una Marca.

    OpenAIRE

    Nerbys Hernández Dorta

    2008-01-01

    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 ...

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

    DEFF Research Database (Denmark)

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

    2011-01-01

    The runtime analysis of randomized search heuristics is a growing field where, in the last two decades, many rigorous results have been obtained. First runtime analyses of ant colony optimization (ACO) have been conducted only recently. In these studies simple ACO algorithms such as the 1-ANT 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......Ones and BinVal. With respect to Evolutionary Algorithms (EAs), such analyses were essential to develop methods for the analysis on more complicated problems. The proof techniques required for the 1-ANT, unfortunately, differ significantly from those for EAs, which means that a new reservoir of methods has...

  11. una desgracia en una oportunidad

    Directory of Open Access Journals (Sweden)

    Antonio Pont Amenós

    2005-01-01

    Full Text Available Cada vez es más importante para un directivo el gestionar las crisis que puedan presentarse tanto en el terreno económico como social. El incendio que se produjo en la planta de Reus del Grupo Borges es una experiencia de la que se derivaron muchas lecciones y en la que se tuvieron que tomar muchas decisiones sobre la marcha que implicaron liderazgo, relaciones públicas y gestión de empresa en la que se consiguió convertir una desgracia en una oportunidad.

  12. Pest repelling properties of ant pheromones

    OpenAIRE

    Offenberg, Joachim

    2014-01-01

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

  13. Le cybercommerçant

    OpenAIRE

    Lauboué, Adongon Sylvain

    2015-01-01

    Le cybercommerçant se distingue du commerçant traditionnel à travers ladématérialisation de ses activités due à l’utilisation d’Internet. Ainsi, la dématérialisation desactivités du cybercommerçant, en dépit des avantages, pose deux séries de problèmes dues àl’ubiquité et à la dépersonnalisation. L’ubiquité se manifeste par le fait que le site Internet ducybercommerçant est accessible dans presque tous les États. La dépersonnalisation crée desrisques dus d’une part, au défaut de présence phys...

  14. Me llamo Dominga : relato de una mujer en fase terminal

    OpenAIRE

    García Navarro, Esperanza Begoña; Pérez Espina, Rosa; García Navarro, Sonia

    2008-01-01

    El cuidado al enfermo oncológico ha sido y es objeto de múltiples estudios, el relato que se presenta quiere plasmar las necesidades que estos enfermos plantean como reales en el proceso de su enfermedad, sea cual sea su pronóstico. El hecho de ser mujer en el desarrollo de una enfermedad suscita conflictos de roles en la familia y sobretodo en la propia mujer creando una dualidad mental de culpabilidad ante su situación de enfermedad y en algunos casos ante un fata...

  15. Me llamo Dominga: relato de una mujer en fase terminal

    OpenAIRE

    García Navarro, Esperanza Begoña; Pérez Espina, Rosa; García Navarro, Sonia

    2008-01-01

    El cuidado al enfermo oncológico ha sido y es objeto de múltiples estudios, el relato que se presenta quiere plasmar las necesidades que estos enfermos plantean como reales en el proceso de su enfermedad, sea cual sea su pronóstico. El hecho de ser mujer en el desarrollo de una enfermedad suscita conflictos de roles en la familia y sobretodo en la propia mujer creando una dualidad mental de culpabilidad ante su situación de enfermedad y en algunos casos ante un fatal desenlace; además se le a...

  16. Termites, hemimetabolous diploid white ants?

    OpenAIRE

    Korb Judith

    2008-01-01

    Abstract Ants and termites are the most abundant animals on earth. Their ecological success is attributed to their social life. They live in colonies consisting of few reproducing individuals, while the large majority of colony members (workers/soldiers) forego reproduction at least temporarilly. Despite their apparent resemblance in social organisation, both groups evolved social life independently. Termites are basically social cockroaches, while ants evolved from predatory wasps. In this r...

  17. Neuroretinitis following bull ant sting

    OpenAIRE

    Ullrich, Katja; Saha, Niladri; Lake, Stewart

    2012-01-01

    Cat scratch disease causes the majority of cases of neuroretinitis. Neuroretinitis is characterised by clinical features of papillitis, macular oedema and macular star. We report a case study of infection with Bartonella henselae most likely transmitted by a bull ant sting. The patient presented with blurred vision and reduced visual acuity after being stung by an ant in her garden some 7 days earlier. Further testing revealed positive serology to B henselae and the patient improved with appr...

  18. 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.

  19. Ant larval demand reduces aphid colony growth rates in an ant-aphid interaction

    OpenAIRE

    Cook, James M.; Leather, Simon R; Oliver, Tom H.

    2012-01-01

    Ants often form mutualistic interactions with aphids, soliciting honeydew in return for protective services. Under certain circumstances, however, ants will prey upon aphids. In addition, in the presence of ants aphids may increase the quantity or quality of honeydew produced, which is costly. Through these mechanisms, ant attendance can reduce aphid colony growth rates. However, it is unknown whether demand from within the ant colony can affect the ant-aphid interaction. In a factorial exper...

  20. Pest repelling properties of ant pheromones

    DEFF Research Database (Denmark)

    Offenberg, Joachim

    2014-01-01

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

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

    Directory of Open Access Journals (Sweden)

    Alan Andersen

    1997-06-01

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

  2. 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.

  3. 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.

  4. Detrimental effects of highly efficient interference competition: invasive Argentine ants outcompete native ants at toxic baits.

    Science.gov (United States)

    Buczkowski, Grzegorz; Bennett, Gary W

    2008-06-01

    The Argentine ant (Linepithema humile) is an invasive species that disrupts the balance of natural ecosystems by displacing indigenous ant species throughout its introduced range. Previous studies that examined the mechanisms by which Argentine ants attain ecological dominance showed that superior interference and exploitation competition are key to the successful displacement of native ant species. The objective of this research was to test the hypothesis that effective interference competition by Argentine ants may also be detrimental to the survival of Argentine ant colonies where Argentine ants and native ants compete at toxic baits used to slow the spread of Argentine ants. To study this hypothesis, we examined the competitive interactions between Argentine ants and native odorous house ants, Tapinoma sessile, in the presence and absence of toxic baits. Results showed that Argentine ants aggressively outcompete T. sessile from toxic baits through efficient interference competition and monopolize bait resources. This has severe negative consequences for the survival of Argentine ants as colonies succumb to the toxic effects of the bait. In turn, T. sessile avoid areas occupied by Argentine ants, give up baits, and consequently suffer minimal mortality. Our results provide experimental evidence that highly efficient interference competition may have negative consequences for Argentine ants in areas where toxic baits are used and may provide a basis for designing innovative management programs for Argentine ants. Such programs would have the double benefit of selectively eliminating the invasive species while simultaneously protecting native ants from the toxic effects of baits. PMID:18559180

  5. 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

  6. Familia y enfermedad de alzheimer. Una perspectiva cualitativa

    OpenAIRE

    Algado Ferrer, María Teresa; Basterra, Ángel; Garrigós Monerris, José Ignacio

    1997-01-01

    Este trabajo estudia, desde una perspectiva sociológica cualitativa, los efectos, que el cuidado de un enfermo de Alzheimer, producen en la vida personal, familiar y social de sus familiares cuidadores, e intenta poner de manifiesto que estamos ante un problema no sólo médico o sanitario, sino también familiar y social, que requiere una mayor atención.

  7. Diabetes mellitus: la pandemia del siglo XXI

    OpenAIRE

    Isla Pera, Pilar

    2012-01-01

    La diabetes mellitus (DM) constituye uno de los principales problemas de salud pública debido a su elevada prevalencia, al hecho de que puede afectar a personas de cualquier edad, sexo, clase social y área geográfica, a su elevada morbilidad y mortalidad y a su elevado coste sanitario. Tanto la DM tipo 1 (DM1) como la DM tipo 2 (DM2) cursan con hiperglucemia lo que puede originar complicaciones agudas hiperglucémicas e hipogucémicas, debido al tratamiento, y graves complicaciones crónicas mac...

  8. Ants as flower visitors : floral ant-repellence and the impact of ant scent-marks on pollinator behaviour

    OpenAIRE

    Ballantyne, Gavin

    2011-01-01

    As flower visitors, ants rarely benefit a plant, commonly disrupting pollination by deterring other flower visitors, or stealing nectar. This thesis examines three aspects of ant-flower interactions, focusing on the occurrence of floral traits that prevent disruption of pollination and a novel means by which ants may influence pollinator behaviour. To assess which types of plant species possess ant-repelling floral traits I carried out a survey of 49 Neotropical plant species. ...

  9. Myrmecotrophy: Plants fed by ants.

    Science.gov (United States)

    Beattie, A

    1989-06-01

    Two plant genera with tubers specialized for occupation by ants absorb nutrients from waste materials accumulated by the resident colonies. The mineral resources of these host plants are augmented by colony foraging which functions as a second root system. This mutualistic interaction has become known as myrmecotrophy. Many other kinds of plant structure are apparent adaptations to accommodate ant colonies; these include pouches on leaves or petioles and hollow twigs, stems or thorns. Sometimes the ant species residing in these structures are aggressive towards enemies of the host plant and are important for plant defence. Recent research provides some evidence that myrmecotrophy may have a wider role in plant nutrition, at least when subsidizing the costs of plant defence. PMID:21227344

  10. Un mundo dominado por los microorganismos: ecología microbiana de los lagos antárticos

    OpenAIRE

    Camacho, A.; Fernández-Valiente, E.

    2005-01-01

    La Antártida es el continente con las condiciones climáticas más severas de nuestro planeta. Esa dureza ambiental limita notablemente la diversidad de seres vivos que encontramos en los ecosistemas antárticos en comparación con los de latitudes más bajas. Sin embargo, los ecosistemas acuáticos antárticos, y más concretamente los continentales, en la medida en que presentan agua libre, suponen una oportunidad para la vida que encuentra en ellos unos oasis en un desierto helado. A pesa...

  11. Ants as tools in sustainable agriculture

    DEFF Research Database (Denmark)

    Offenberg, Joachim

    2015-01-01

    multiple crops. Their efficiency is comparable to chemical pesticides or higher, while at lower costs. They provide a rare example of documented efficient conservation biological control. 3. Weaver ants share beneficial traits with almost 13 000 other ant species and are unlikely to be unique in their....... Being predatory and organized as superorganisms, ants possess traits making them suitable agents in IPM. Recent works on weaver ants Oecophylla spp. showcase ants as highly efficient pest controllers. A synthesis shows that weaver ants can reduce pest numbers and their damage and increase yields in...... properties as control agents. A synthesis of applied work on other ant species illustrates potentials for control of arthropod pests, weeds and plant diseases in orchards, forestry and arable crops. 4. Synthesis and applications. By showing that ant biocontrol can match synthetic pesticides in a wide setting...

  12. 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.

  13. Ants defend coffee from berry borer colonization

    OpenAIRE

    Gonthier, DJ; Ennis, KK; Philpott, SM; Vandermeer, J; Perfecto, I.

    2013-01-01

    Ants frequently prevent herbivores from damaging plants. In agroecosystems they may provide pest control services, although their contributions are not always appreciated. Here we compared the ability of eight ant species to prevent the coffee berry borer from colonizing coffee berries with a field exclusion experiment. We removed ants from one branch (exclusion) and left ants to forage on a second branch (control) before releasing 20 berry borers on each branch. After 24 h, six of eight spec...

  14. The Biochemical Toxin Arsenal from Ant Venoms

    OpenAIRE

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

    2016-01-01

    Ants (Formicidae) represent a taxonomically diverse group of hymenopterans with over 13,000 extant species, the majority of which inject or spray secretions from a venom gland. The evolutionary success of ants is mostly due to their unique eusociality that has permitted them to develop complex collaborative strategies, partly involving their venom secretions, to defend their nest against predators, microbial pathogens, ant competitors, and to hunt prey. Activities of ant venom include paralyt...

  15. The biochemical toxin arsenal from ant venoms

    OpenAIRE

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

    2016-01-01

    Ants (Formicidae) represent a taxonomically diverse group of hymenopterans with over 13,000 extant species, the majority of which inject or spray secretions from a venom gland. The evolutionary success of ants is mostly due to their unique eusociality that has permitted them to develop complex collaborative strategies, partly involving their venom secretions, to defend their nest against predators, microbial pathogens, ant competitors, and to hunt prey. Activities of ant venom include paralyt...

  16. Ants as Fluids: Physics-Inspired Biology

    CERN Document Server

    Streiff, Micah; Shinotsuka, Sho; Alexeev, Alex; Hu, David

    2010-01-01

    Fire ants use their claws to grip diverse surfaces, including each other. As a result of their mutual adhesion and large numbers, ant colonies flow like inanimate fluids. In this sequence of films, we demonstrate how ants behave similarly to the spreading of drops, the capillary rise of menisci, and gravity-driven flow down a wall. By emulating the flow of fluids, ant colonies can remain united under stressful conditions.

  17. cAnt-Miner: an ant colony classification algorithm to cope with continuous attributes

    OpenAIRE

    Otero, Fernando E.B.; Freitas, Alex. A.; Johnson, Colin G.

    2008-01-01

    This paper presents an extension to Ant-Miner, named cAnt-Miner (Ant-Miner coping with continuous attributes), which incorporates an entropy-based discretization method in order to cope with continuous attributes during the rule construction process. By having the ability to create discrete intervals for continuous attributes "on-the-fly", cAnt-Miner does not requires a discretization method in a preprocessing step, as Ant-Miner requires. cAnt-Miner has been compared against Ant-Miner in eigh...

  18. 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…

  19. FIRE ANT, BIOLOGY, ECOLOGY, AND BIOCONTROL

    Science.gov (United States)

    The red fire ant Solenopsis invicta was accidentally introduced into the United States from South America sometime in the 1930s. These ants do best in open, disturbed habitats associated with human activities. Fire ants construct large earthen mounds which function as solar collecting devises. Fire...

  20. 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.

  1. Male parentage in army ants

    DEFF Research Database (Denmark)

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

    2006-01-01

    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...

  2. 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...

  3. 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

  4. Microsatellite primers for fungus-growing ants

    DEFF Research Database (Denmark)

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

    2002-01-01

    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.......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...

  5. Microsatellite Primers for Fungus-Growing Ants

    DEFF Research Database (Denmark)

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

    2002-01-01

    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.......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...

  6. El agotamiento del paradigma burocrático ante el riesgo ambiental contemporáneo

    OpenAIRE

    Miguel Moreno Plata

    2011-01-01

    El presente artículo explora los límites del modelo burocrático ante los peligros derivados de los problemas ambientales contemporáneos, cuya naturaleza vinculada con diversos rangos de incertidumbre es opuesta a la lógica y posibilidades del cálculo del paradigma weberiano. Ante este agotamiento paradigmático surge la necesidad de un nuevo modelo de gestión del riesgo, a partir de una nueva racionalidad sustentada en el principio precautorio y en la percepción social del riesgo.

  7. Ansiedad ante los exámenes: relación con variables personales y familiares

    OpenAIRE

    Rosário, Pedro José Sales Luís de Fonseca; Núñez Pérez, José Carlos; Salgado, Ana; González García, Julio Antonio; Valle Arias, Antonio; Joly, Maria Cristina Rodrigues Azevedo; Bernardo Gutiérrez, Ana Belén

    2008-01-01

    La ansiedad ante los exámenes es un comportamiento muy frecuente, sobre todo entre la población escolar que afronta una presión social muy centrada en la obtención de un gran éxito académico. Pocos estudios han analizado las relaciones entre la ansiedad ante los exámenes, la postergación académica (academic procrastination), variables personales y familiares y las notas en matemáticas. En este trabajo se analiza el impacto de variables sociopersonales tales como el nivel de estudi...

  8. La ciencia y el científico ante el reto de la unidad europea

    OpenAIRE

    Muñoz, Emilio

    1989-01-01

    El papel del científico y de la ciencia ante la unidad europea izo puede separarse de lo que este proceso significa con respecto a la competitividad, ya que las presiones que acompañan a este proceso deben cansar un impacto positivo en el progreso científico y tecnológico. Este contexto europeo coincide con una profunda reflexión ante los modelos de desarrollo. La aplicación de un modelo basado en objetivos exclusivamente cuantitativos está siendo hoy cuestionado, promovie...

  9. 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.

  10. Discrimination Behavior in the Supercolonial Pharaoh Ant

    DEFF Research Database (Denmark)

    Pontieri, Luigi

    The majority of eusocial insect species live in small, kin structured colonies that are mutually aggressive and rarely interact. By contrast, a restricted group of ant species show a peculiar social organization called unicoloniality, where colonies can grow to vast networks of geographically...... discrimination behavior of the invasive pharaoh ant (Monomorium pharaonis) as a model for other invasive and supercolonial ant species. The pharaoh ant is one of the few ant species that can be reared in the laboratory for many generations. Furthermore, the possibility to do controlled crosses of colonies...... of invasive ants. In the first chapter I focused on the nestmate recognition system of pharaoh ants, investigating whether the cues used for discrimination had a genetic origin and how different level of within-colony genetic diversity and relatedness influenced the discrimination abilities of the...

  11. Una mirada a la experiencia vivida por mujeres que han roto una relación de pareja violenta

    OpenAIRE

    Santana Hernández, Juana Dolores; González Méndez, Rosaura

    2013-01-01

    La actuación profesional en el ámbito de la violencia familiar y de género requiere de diagnósticos basados en las distintas variables que configuran la complejidad del fenómeno. Además, una buena práctica requiere una escucha activa sobre lo que las mujeres relatan acerca de su experiencia vital. En este artículo presentamos los resultados de un estudio que describe las experiencias vividas por un grupo de mujeres, antes y después de abandonar una relación violenta. Nuestro objetivo era cono...

  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 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...... and the Anthropocene through, as we propose improvisation, valuing and caring....

  13. Revolutionizing Remote Exploration with ANTS

    Science.gov (United States)

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

    2002-05-01

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

  14. Fire ant-detecting canines: a complementary method in detecting red imported fire ants.

    Science.gov (United States)

    Lin, Hui-Min; Chi, Wei-Lien; Lin, Chung-Chi; Tseng, Yu-Ching; Chen, Wang-Ting; Kung, Yu-Ling; Lien, Yi-Yang; Chen, Yang-Yuan

    2011-02-01

    In this investigation, detection dogs are trained and used in identifying red imported fire ants, Solenopsis invicta Buren, and their nests. The methodology could assist in reducing the frequency and scope of chemical treatments for red imported fire ant management and thus reduce labor costs and chemical use as well as improve control and quarantine efficiency. Three dogs previously trained for customs quarantine were retrained to detect the scents of red imported fire ants. After passing tests involving different numbers of live red imported fire ants and three other ant species--Crematogaster rogenhoferi Mayr, Paratrechina longicornis Latreille, and Pheidole megacephala F.--placed in containers, ajoint field survey for red imported fire ant nests by detection dogs and bait traps was conducted to demonstrate their use as a supplement to conventional detection methods. The most significant findings in this report are (1) with 10 or more red imported fire ants in scent containers, the dogs had >98% chance in tracing the red imported fire ant. Upon the introduction of other ant species, the dogs still achieved on average, a 93% correct red imported fire ant indication rate. Moreover, the dogs demonstrated great competence in pinpointing emerging and smaller red imported fire ant nests in red imported fire ant-infested areas that had been previously confirmed by bait trap stations. (2) Along with the bait trap method, we also discovered that approximately 90% of red imported fire ants foraged within a distance of 14 m away from their nests. The results prove detection dogs to be most effective for red imported fire ant control in areas that have been previously treated with pesticides and therefore containing a low density of remaining red imported fire ant nests. Furthermore, as a complement to other red imported fire ant monitoring methods, this strategy will significantly increase the efficacy of red imported fire ant control in cases of individual mount treatment

  15. 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

  16. 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.

  17. Symbiont recruitment versus ant-symbiont co-evolution in the attine ant-microbe symbiosis.

    Science.gov (United States)

    Mueller, Ulrich G

    2012-06-01

    The symbiosis between fungus-farming ants (Attini, Formicidae), their cultivated fungi, garden-infecting Escovopsis pathogens, and Pseudonocardia bacteria on the ant integument has been popularized as an example of ant-Escovopsis-Pseudonocardia co-evolution. Recent research could not verify earlier conclusions regarding antibiotic-secreting, integumental Pseudonocardia that co-evolve to specifically suppress Escovopsis disease in an ancient co-evolutionary arms-race. Rather than long-term association with a single, co-evolving Pseudonocardia strain, attine ants accumulate complex, dynamic biofilms on their integument and in their gardens. Emerging views are that the integumental biofilms protect the ants primarily against ant diseases, whereas garden biofilms protect primarily against garden diseases; attine ants selectively recruit ('screen in') microbes into their biofilms; and the biofilms of ants and gardens serve diverse functions beyond disease-suppression. PMID:22445196

  18. Leaf-Cutter Ant Parasitoids: Current Knowledge

    OpenAIRE

    Patricia J. Folgarait

    2013-01-01

    This review updates and summarizes the current knowledge about the interaction of leaf-cutter ants and their parasitoids by providing comparable data for Acromyrmex and Atta ants. First, an overview of the relevant aspects of the biology and taxonomy of leaf cutters and of their parasitoids is provided. Second, I show the peculiarities of the parasitoids attacking behaviors towards their host as well as the responses or ant defenses against the phorids exhibited by their hosts. Third, I discu...

  19. The agricultural pathology of ant fungus gardens

    OpenAIRE

    Currie, Cameron R; Mueller, Ulrich G.; Malloch, David

    1999-01-01

    Gardens of fungus-growing ants (Formicidae: Attini) traditionally have been thought to be free of microbial parasites, with the fungal mutualist maintained in nearly pure “monocultures.” We conducted extensive isolations of “alien” (nonmutualistic) fungi from ant gardens of a phylogenetically representative collection of attine ants. Contrary to the long-standing assumption that gardens are maintained free of microbial pathogens and parasites, they are in fact host to specialized parasites th...

  20. Path integration in desert ants, Cataglyphis fortis

    OpenAIRE

    Müller, Martin; Wehner, Rüdiger

    1988-01-01

    Foraging desert ants, Cataglyphis fortis, continually keep track of their own posotions relative to home— i.e., integrate their tortuous outbound routes and return home along straight (inbound) routes. By experimentally manipulating the ants' outbound trajectories we show that the ants solve this path integration problem not by performing a true vector summation (as a human navigator does) but by employing a computationally simple approximation. This approximation is characterized by small, b...

  1. Towards a multilevel ant colony optimization

    OpenAIRE

    Lian, Thomas Andreé; Llave, Marilex Rea

    2014-01-01

    Ant colony optimization is a metaheuristic approach for solving combinatorial optimization problems which belongs to swarm intelligence techniques. Ant colony optimization algorithms are one of the most successful strands of swarm intelligence which has already shown very good performance in many combinatorial problems and for some real applications. This thesis introduces a new multilevel approach for ant colony optimization to solve the NP-hard problems shortest path and traveling salesman....

  2. GRID SCHEDULING USING ENHANCED ANT COLONY ALGORITHM

    OpenAIRE

    Mr. P.Mathiyalagan; U.R. Dhepthie; S.N. Sivanandam

    2010-01-01

    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 schedu...

  3. Ant cuticular response to phthalate pollution

    OpenAIRE

    Lenoir, Alain; Axel, Touchard; Devers, Séverine; Christidès, Jean-Philippe; Boulay, Raphaël; Cuvillier-Hot, Virginie

    2014-01-01

    Phthalates are common atmospheric contaminantsused in the plastic industry. Ants have been shown to constitutegood bioindicators of phthalate pollution. Hence,phthalates remain trapped on ant cuticles which are mostlycoated with long-chain hydrocarbons. In this study, we artificiallycontaminated Lasius niger ants with four phthalates:dibutyl phthalate (DBP), diisobutyl phthalate (DiBP), di(2-ethylhexyl) phthalate (DEHP), and benzyl butyl phthalate(BBP). The first three have previously been fo...

  4. 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...

  5. 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.

  6. The fire ant Solenopsis saevissima and habitat disturbance alter ant communities

    OpenAIRE

    Dejean, A; Cereghino, R.; Leponce, M.; Rossi, V; Roux, Olivier; Compin, A.; Delabie, J. H. C.; Corbara, B.

    2015-01-01

    The fire ant Solenopsis saevissima is a major pest frequent in human-disturbed areas of its native range where it forms 'supercolonies'. We determined that its natural habitat in French Guiana is likely the sporadically flooded riparian forest and aimed to evaluate this ant's impact on the abundance and diversity of other ants by comparing different habitats at two sites. We noted a significant decrease in ant species richness between the rainforest and human-disturbed habitats (but not betwe...

  7. Multi-Phase Defense by the Big-Headed Ant, Pheidole obtusospinosa, Against Raiding Army Ants

    OpenAIRE

    Huang, Ming H.

    2010-01-01

    Army ants are well known for their destructive raids of other ant colonies. Some known defensive strategies include nest evacuation, modification of nest architecture, blockade of nest entrances using rocks or debris, and direct combat outside the nest. Since army ants highly prefer Pheidole ants as prey in desert habitats, there may be strong selective pressure on Pheidole to evolve defensive strategies to better survive raids. In the case of P. obtusospinosa Pergande (Hymenoptera: Formicida...

  8. Ant Colony Optimization Algorithm for Continuous Domains Based on Position Distribution Model of Ant Colony Foraging

    OpenAIRE

    Liqiang Liu; Yuntao Dai; Jinyu Gao

    2014-01-01

    Ant colony optimization algorithm for continuous domains is a major research direction for ant colony optimization algorithm. In this paper, we propose a distribution model of ant colony foraging, through analysis of the relationship between the position distribution and food source in the process of ant colony foraging. We design a continuous domain optimization algorithm based on the model and give the form of solution for the algorithm, the distribution model of pheromone, the update rules...

  9. La Antártida: ¿un raro caso de continuidad en la línea de política exterior argentina?

    OpenAIRE

    Parodi, Sebastián

    2007-01-01

    La República Argentina tiene presencia ininterrumpida en la Antártida desde 1904, pero sin embargo no fue sino hasta 1957 que el país planteó una pretensión de soberanía sobre una porción claramente definida del territorio antártico. En este trabajo se buscará analizar la política exterior argentina en la cuestión antártica desde la firma del Tratado Antártico en 1959, pero prestando especial atención al período posterior a la restauración democrática de 1983. La hipótesis de este traba...

  10. Pest repellent properties of ant pheromones

    DEFF Research Database (Denmark)

    Offenberg, Joachim

    2012-01-01

    of ant pheromones may be sufficient to repel pest insects from ant territories. The study of ant semiochemicals is in its infancy, yet, evidence for their potential use in pest management is starting to build up. Pheromones from four of five tested ant species have been shown to deter herbivorous insect...... from the ants’ host plants. (i) Oecophylla smaragdina deposits disrupt chrysomelid (Rhyparida wallacei) feeding on a Thai mangrove, and (ii) deposits from O. longinoda repel ovipositing fruit flies (Bactrosera invadens and Ceratitis cosyra) from mango fruits in Benin. Also, deposits from two New World...

  11. 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

  12. 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.

  13. 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.

  14. 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.

  15. 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

  16. Control de Quad-rotors mitjançant la plataforma Arduino

    OpenAIRE

    Nadales Real, Christian

    2009-01-01

    L'objectiu del treball és l'estudi de les solucions òptimes per al control del moviment i posicionament de dispositius com els quad-rotors mitjançant l' utilització de la plataforma arduino. Serà necessària una tasca inicial de recerca de les solucions implementades als elements comercials, i la possibilitat de implementar-los en un sistema propi.

  17. 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.

  18. 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

  19. 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.

  20. Impacto de las actividades humanas en el estado sanitario de fócidos y otarios en la península Antártica

    OpenAIRE

    S. Pedraza Díaz

    2011-01-01

    La Antártida es indiscutiblemente una de las zonas menos afectadas por la actividad humana en el planeta, sin embargo el incremento de la presencia humana registrado en los últimos años puede tener importantes efectos sobre el ecosistema antártico. Las consecuencias a medio o largo plazo pueden incluir aspectos relacionados con el estado sanitario y la aparición o redistribución de enfermedades en la fauna autóctona. Los mamíferos marinos, y en concreto los pinnípedos antárticos, por sus cara...

  1. ¿Qué hacemos ante un brote de escabiosis en un hospital?

    Directory of Open Access Journals (Sweden)

    María Maestre Naranjo

    2014-03-01

    Full Text Available La escabiosis o sarna es una enfermedad de la piel producida por Sarcoptes scabiei; puede ir aumentando el número de casos, hasta llegar a producir verdaderas epidemias¹. Se procede a describir las actuaciones del Servicio de Prevención de Riesgos Laborales de un hospital ante un brote de escabiosis ocurrido en una planta de hospitalización, con afectación de trabajadores sanitarios, tras el contacto con un paciente fuente (sospecha clínica y epidemiológica de escabiosis.

  2. Diseño de una estrategia didáctica para el desarrollo de la Función Ejecutiva a partir del estudio de los ecosistemas en el grado segundo de la básica primaria de la Institución Educativa Primitivo Leal La Doctora (Sabaneta, Ant)

    OpenAIRE

    Bolívar Hernández, María Ofir

    2015-01-01

    Resumen: en este trabajo se da a conocer el desarrollo una experiencia de aula cimentada desde el aprendizaje significativo, el desarrollo de procesos de pensamiento de alto nivel y la enseñanza de las ciencias, en la búsqueda de la cualificación del ambiente escolar y por ende, del rendimiento académico, con los estudiantes de segundo grado de la básica primaria en la Institución Educativa Primitivo Leal La Doctora del Municipio de Sabaneta. Para ello, se aborda una exploración teórica con r...

  3. Ecología del paisaje y sistemas de información geográfica ante el cambio socioambiental en las áreas de la montaña mediterránea. Una aproximación metodológica al caso de los valles d'Hortmoier y Sant Aniol

    OpenAIRE

    Varga Linde, Diego; Vila Subirós, Josep

    2006-01-01

    Este artículo es una aproximación a los métodos utilizados para analizar, cuantificar y valorar los cambios en los usos y cubiertas del suelo en estos dos valles que forman parte del espacio natural protegido de la Alta Garrotxa. La dinámica vivida en este territorio es un claro ejemplo de los procesos acaecidos a lo largo del siglo XX en buena parte de las áreas de montaña mediterránea. Una dinámica caracterizada fundamentalmente por un incremento de la superficie forestal en detrimento d...

  4. 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.

  5. Implementasi Algoritma Ant Colony System Dalam Menentukan Optimisasi Network Routing .

    OpenAIRE

    Lubis, Dini Anggraini

    2011-01-01

    Ant Colony System is an algorithm that adapt from ants biologic behavior which the ant colony can hold to find shortest path. Ant Colony System can implement for several optimization problems and one of them is in network routing. Ant colony system that talked in this paper is about optimization cases in network routing called AntNet. The purpose of AntNet is to search shortest path between source node to destination node based the table routing read by AntNet. In this research, it implemente...

  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. The Biochemical Toxin Arsenal from Ant Venoms.

    Science.gov (United States)

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

    2016-01-01

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

  8. 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.

  9. The Complexity of Fire Ant Nestmate Recognition

    Science.gov (United States)

    Fire ants, Solenopsis invicta and Solenopsis richteri, were inadvertently introduced into the United States in the early 1900s and currently inhabit over 129 million hectares in Puerto Rico and twelve southern states from Texas to Virginia. Imported fire ants have also become established in isolated...

  10. 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.

  11. 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.

  12. Hybrid chaotic ant swarm optimization

    International Nuclear Information System (INIS)

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

  13. 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.

  14. Cryptococcus neoformans carried by Odontomachus bauri ants

    Directory of Open Access Journals (Sweden)

    Mariana Santos de Jesus

    2012-06-01

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

  15. Fungal Adaptations to Mutualistic Life with Ants

    DEFF Research Database (Denmark)

    Kooij, Pepijn Wilhelmus

    Fungus-growing ants (Attini) feed off a fungus they cultivate in a mutualistic symbiosis in underground chambers by providing it substrate they collect outside the colony. The tribe of Attine ants ranges from small colonies of the paleo- and basal Attine species with a few hundred workers that...... forage on crude substrates such as insect frass and dry plant material, to large colonies of the leaf-cutting ants with several thousands to several million workers that provide live plant material to their fungus gardens. Leaf-cutting ants are the dominant herbivores of the Neo-tropics, and have a major...... estimate that approximately half of these nuclei were represented by different genomes, giving the fungus a ploidy level of 5n-6n. In mutualistic symbioses it is important the partners stay true to each other. In fungus-growing ants, new founding queens bring a piece of fungus to build up their new colony...

  16. Urban ants and transportation of nosocomial bacteria.

    Science.gov (United States)

    Rodovalho, Cynara M; Santos, Ana L; Marcolino, Marcus T; Bonetti, Ana M; Brandeburgo, Malcon A M

    2007-01-01

    Many ant species displaying synanthropic behavior that have successfully dispersed in urban areas can cause problems in hospitals by acting as bacterial vectors. In this study, we encountered bacteria on ants collected at the Universidade Federal de Uberlândia hospital, in the campus and at households nearby. The ants were identified as Tapinoma melanocephalum (Fabricius) and Camponotus vittatus (Forel) (Hymenoptera: Formicidae) and the bacterial strains found here belong to the group of the coagulase-positive staphylococcus, coagulase-negative staphylococcus and gram negative bacilli, including antimicrobial drug-resistant strains. An investigation of the bacteria found in the ants and in the environment revealed that some ants carried non-isolated bacteria from the same environment and with high levels of resistance, evidencing the transmission potential of these insects. PMID:17710329

  17. 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

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

    OpenAIRE

    H. Horn; Arrellano, H.

    1990-01-01

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

  19. Notas sobre una sinagoga de zaragoza, la de "Alhaquim"

    OpenAIRE

    Marín Padilla, Encarnación

    1996-01-01

    La autora da noticia del hallazgo de un documento del archivo de protocolos notariales de Zaragoza, en el que se alude a las sucesivas ventas de parte de una sinagoga de la ciudad, la de "Alhaquim", cuyo ultimo propietario fue el converso Leonardo de la caballería. Dichas ventas se testificaron ante dos notarios, el judío Sento Gallipapa y el cristiano Pedro Latallada, en el año 1433.

  20. El metabolismo social: una nueva teoría socioecológica

    OpenAIRE

    Toledo, Víctor M.

    2013-01-01

    Ante la necesidad de construir marcos conceptuales que permitan realizar análisis congruentes sobre las relaciones entre los procesos naturales y los procesos sociales desde una perspectiva holística o integradora, el artículo lleva a cabo una narrativa de la teoría del metabolismo social, uno de los instrumentos propuestos en la última década para comprender la compleja realidad actual. Para ello se hace una breve revisión de los orígenes del concepto y una síntesis de sus principales signif...

  1. 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.

  2. 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...

  3. Ant-Based Cyber Security

    Energy Technology Data Exchange (ETDEWEB)

    Haack, Jereme N.; Fink, Glenn A.; Maiden, Wendy M.; McKinnon, Archibald D.; Templeton, Steven J.; Fulp, Errin W.

    2011-07-12

    We describe a swarming-agent-based, mixed-initiative approach to infrastructure defense where teams of humans and software agents defend cooperating organizations in tandem by sharing insights and solutions without violating proprietary boundaries. The system places human administrators at the appropriate level where they provide system guidance while lower-level agents carry out tasks humans are unable to perform quickly enough to mitigate today’s security threats. Cooperative Infrastructure Defense (CID) uses our ant-based approach to enable dialogue between humans and agents to foster a collaborative problem-solving environment, increase human situational awareness and influence using visualization and shared control. We discuss theoretical implementation characteristics along with results from recent proof-of-concept implementations.

  4. Individual Recognition in Ant Queens

    DEFF Research Database (Denmark)

    D'Ettorre, Patrizia; Heinze, Jürgen

    2005-01-01

    recognize each other's unique facial color patterns [3] . Individual recognition is advantageous when dominance hierarchies control the partitioning of work and reproduction 2 and 4 . Here, we show that unrelated founding queens of the ant Pachycondyla villosa use chemical cues to recognize each other...... individually. Aggression was significantly lower in pairs of queens that had previously interacted than in pairs with similar social history but no experience with one another. Moreover, subordinates discriminated familiar and unfamiliar dominants in choice experiments in which physical contact, but not odor...... perception, was prevented and in tests with anaesthetized queens. The cuticular chemical profiles of queens were neither associated with dominance nor fertility and, therefore, do not represent status badges 5 and 6 , and nestmate queens did not share a common odor. Personal recognition facilitates...

  5. Recomendaciones para una presentación oral

    OpenAIRE

    Pulpón Segura, Anna M.; Icart Isern, M. Teresa (Maria Teresa); Nolla i Domenjó, Maria; Caja López, Carmen; Solà Pola, Montserrat

    2002-01-01

    Los profesionales de la salud deben ser competentes en el desarrollo de su disciplina pero además deberán ser hábiles en el manejo de las herramientas destinadas a la comunicación, cuyo uso será necesario en algún momento de su carrera profesional. El presente artículo describe algunos de los elementos que intervienen antes, durante y después de la comunicación oral y que pueden ser útiles para mejorar las habilidades personales para realizar una exposición oral. Enfrentarse a una audiencia p...

  6. How to be an ant on figs

    Science.gov (United States)

    Bain, Anthony; Harrison, Rhett D.; Schatz, Bertrand

    2014-05-01

    Mutualistic interactions are open to exploitation by one or other of the partners and a diversity of other organisms, and hence are best understood as being embedded in a complex network of biotic interactions. Figs participate in an obligate mutualism in that figs are dependent on agaonid fig wasps for pollination and the wasps are dependent on fig ovules for brood sites. Ants are common insect predators and abundant in tropical forests. Ants have been recorded on approximately 11% of fig species, including all six subgenera, and often affect the fig-fig pollinator interaction through their predation of either pollinating and parasitic wasps. On monoecious figs, ants are often associated with hemipterans, whereas in dioecious figs ants predominantly prey on fig wasps. A few fig species are true myrmecophytes, with domatia or food rewards for ants, and in at least one species this is linked to predation of parasitic fig wasps. Ants also play a role in dispersal of fig seeds and may be particularly important for hemi-epiphytic species, which require high quality establishment microsites in the canopy. The intersection between the fig-fig pollinator and ant-plant systems promises to provide fertile ground for understanding mutualistic interactions within the context of complex interaction networks.

  7. 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.

  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

    2008-12-01

    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/m(2)) to 1- and 4-m(2) 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. PMID:19034574

  9. 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.

  10. Calibration of vector navigation in desert ants.

    OpenAIRE

    Collett, M; Collett, T. S.; Wehner, R

    1999-01-01

    Desert ants (Cataglyphis sp.) monitor their position relative to the nest using a form of dead reckoning [1] [2] [3] known as path integration (PI) [4]. They do this with a sun compass and an odometer to update an accumulator that records their current position [1]. Ants can use PI to return to the nest [2] [3]. Here, we report that desert ants, like honeybees [5] and hamsters [6], can also use PI to approach a previously visited food source. To navigate to a goal using only PI information, a...

  11. Data classification by Fuzzy Ant-Miner

    Directory of Open Access Journals (Sweden)

    Mohamed Hamlich

    2012-03-01

    Full Text Available In this paper we propose an extension of classification algorithm based on ant colony algorithms to handle continuous valued attributes using the concepts of fuzzy logic. The ant colony algorithms transform continuous attributes into nominal attributes by creating clenched discrete intervals. This may lead to false predictions of the target attribute, especially if the attribute value history is close to the borders of discretization. Continuous attributes are discretized on the fly into fuzzy partitions that will be used to develop an algorithm called Fuzzy Ant-Miner. Fuzzy rules are generated by using the concept of fuzzy entropy and fuzzy fitness of a rule.

  12. Transición de una red no gestionada a una red segura basada en dispositivos gestionables

    OpenAIRE

    Romero Díaz, Emilio José

    2013-01-01

    Este proyecto surge ante la necesidad de modernización de la infraestructura de comunicaciones del Instituto Andaluz para la Tercera Edad (IATE) de la Junta de Andalucía. El objeto del proyecto es buscar posibles mejoras a los problemas detectados en la red y la puesta en marcha de una gestión de las comunicaciones con una electrónica de red de altas prestaciones, con el fin de aumentar el rendimiento y seguridad de la red. El presente proyecto fin de carrera abarca todos los trabajos realiza...

  13. 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.

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

    OpenAIRE

    10.5867/medwave.2015.03.6124; Julio Maquera-Afaray; García, Patricia J.; César Cárcamo

    2015-01-01

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

  15. Efecto de los ácidos grasos hiperoxigenados en la microcirculación de pacientes con pie diabético

    OpenAIRE

    Sánchez Ríos, Juan Pedro

    2008-01-01

    La Diabetes Mellitus es una pandemia mundial. Actualmente se estima que la prevalencia de la Diabetes en el mundo es del 4.5%. Aproximadamente el 15% de los diabéticos desarrollarán una úlcera en el pie a lo largo de su vida. En la prevención y tratamiento de úlceras en Pie Diabético es importante también considerar, la integridad física y funcional de la piel del paciente para que pueda ejercer su acción protectora ante agresiones externas. Los ácidos grasos hiperoxigenados (AGHO) s...

  16. 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

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

    OpenAIRE

    Parisi, Daniel R.; Soria, Sabrina A; 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 o...

  18. 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. PMID:25571873

  19. 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...

  20. Egocentric information helps desert ants to navigate around familiar obstacles.

    OpenAIRE

    Bisch-Knaden, S.; Wehner, R.

    2001-01-01

    Homing ants have been shown to associate directional information with familiar landmarks. The sight of these local cues might either directly guide the path of the ant or it might activate a landmark-based vector that points towards the goal position. In either case, the ants define their courses within allocentric systems of reference. Here, we show that desert ants, Cataglyphis fortis, forced to run along a devious path can use egocentric information as well. The ants were trained to deviat...

  1. 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...

  2. Thomas Stearns Elioti neoklassitsistlik luuleteooria / Ants Oras

    Index Scriptorium Estoniae

    Oras, Ants

    2003-01-01

    Varem ilmunud: rmt.: "Looming" 1932, nr. 2, lk. 196-208 ; rmt.: Ants Oras, "Laiemasse ringi : kirjanduslikke perspektiive ja profiile". Stockholm : Vaba Eesti, 1961, lk. 29-48, pealkirjaga "T. S. Elioti neoklassiline luuleteooria"

  3. 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.

  4. Structure and formation of ant transportation networks

    OpenAIRE

    Latty, Tanya; Ramsch, Kai; Ito, Kentaro; Nakagaki, Toshiyuki; Sumpter, David J. T.; Middendorf, Martin; Beekman, Madeleine

    2011-01-01

    Many biological systems use extensive networks for the transport of resources and information. Ants are no exception. How do biological systems achieve efficient transportation networks in the absence of centralized control and without global knowledge of the environment? Here, we address this question by studying the formation and properties of inter-nest transportation networks in the Argentine ant (Linepithema humile). We find that the formation of inter-nest networks depends on the number...

  5. Statistical Approach for Selecting Elite Ants

    CERN Document Server

    S., Raghavendra G

    2012-01-01

    Applications of ACO algorithms to obtain better solutions for combinatorial optimization problems have become very popular in recent years. In ACO algorithms, group of agents repeatedly perform well defined actions and collaborate with other ants in order to accomplish the defined task. In this paper, we introduce new mechanisms for selecting the Elite ants dynamically based on simple statistical tools. We also investigate the performance of newly proposed mechanisms.

  6. On Ants, Bacteria and Dynamic Environments

    OpenAIRE

    Ramos, Vitorino; Fernandes, Carlos; Rosa, Agostinho C

    2005-01-01

    Wasps, bees, ants and termites all make effective use of their environment and resources by displaying collective swarm intelligence. Termite colonies - for instance - build nests with a complexity far beyond the comprehension of the individual termite, while ant colonies dynamically allocate labor to various vital tasks such as foraging or defense without any central decision-making ability. Recent research suggests that microbial life can be even richer: highly social, intricately networked...

  7. Clustering outdoor soundscapes using fuzzy ants

    OpenAIRE

    De Coensel, Bert; Botteldooren, Dick; Debacq, K.; Nilsson, M.E.; Berglund, B

    2008-01-01

    A classification algorithm for environmental sound recordings or "soundscapes" is outlined. An ant clustering approach is proposed, in which the behavior of the ants is governed by fuzzy rules. These rules are optimized by a genetic algorithm specially designed in order to achieve the optimal set of homogeneous clusters. Soundscape similarity is expressed as fuzzy resemblance of the shape of the sound pressure level histogram, the frequency spectrum and the spectrum of temporal fluctuations. ...

  8. Covenant idea in ante-Nicene theology

    OpenAIRE

    Duncan, Jennings Ligon

    1995-01-01

    This thesis argues that the covenant idea was more significant in the writings of particular ante-Nicene theologians than has generally been admitted in patristic research or general surveys of the history of the covenant idea in the Christian tradition. Indeed, this survey of the covenant idea in the ante-Nicene period demonstrates a significant usage, development, and modification of the covenant concept as it is found in the OT and NT writings and in early Judaism. This investigation revea...

  9. Worker Longevity in Harvester Ants (Pogonomyrmex)

    OpenAIRE

    Gordon, D M; Hölldobler, B.

    1987-01-01

    Most studies of worker longevity in ants have been made in the laboratory (Haskins and Haskins 1980; Porter and Tschinkel 1982). In the field, increased energy expenditures, predation, and environmental fluctuations may all contribute to shorten the life of a worker ant. In the few existing studies of worker longevity conducted in the field, the lifespan of exterior workers was found to be extremely short. For example, Schmid-Hempel and Schmid- Hempel (1984) found that the half-life of Catagl...

  10. Data classification by Fuzzy Ant-Miner

    OpenAIRE

    Mohamed Hamlich; Mohammed Ramdani

    2012-01-01

    In this paper we propose an extension of classification algorithm based on ant colony algorithms to handle continuous valued attributes using the concepts of fuzzy logic. The ant colony algorithms transform continuous attributes into nominal attributes by creating clenched discrete intervals. This may lead to false predictions of the target attribute, especially if the attribute value history is close to the borders of discretization. Continuous attributes are discretized on the fly into fuzz...

  11. Optic disc detection using ant colony optimization

    OpenAIRE

    Dias, Marcy; Monteiro, Fernando C.

    2012-01-01

    The retinal fundus images are used in the treatment and diagnosis of several eye diseases, such as diabetic retinopathy and glaucoma. This paper proposes a new method to detect the optic disc (OD) automatically, due to the fact that the knowledge of the OD location is essential to the automatic analysis of retinal images. Ant Colony Optimization (ACO) is an optimization algorithm inspired by the foraging behaviour of some ant species that has been applied in image processing for edge detectio...

  12. Automatic Programming with Ant Colony Optimization

    OpenAIRE

    Green, Jennifer; Jacqueline L. Whalley; Johnson, Colin G.

    2004-01-01

    Automatic programming is the use of search techniques to find programs that solve a problem. The most commonly explored automatic programming technique is genetic programming, which uses genetic algorithms to carry out the search. In this paper we introduce a new technique called Ant Colony Programming (ACP) which uses an ant colony based search in place of genetic algorithms. This algorithm is described and compared with other approaches in the literature.

  13. HERBAL PLANTS AS AN ANT REPELLENT

    OpenAIRE

    Chaudhari PS*, Jangam SS Chaudhari SV, Baheti KG, Patil SU and Jadhav GB

    2013-01-01

    The present study focused on developing effective ant repellent from herbal plant extracts. The extracts of mentioned plants were prepared by grinding with water. The aqueous extracts were treated individually as well as in different combination against 15 ants at dose levels of 1%, 5%, 10%. Observations were made at 5 min of time intervals for total period of 15 min. Highest % repellency was recorded in cucumber-mint (100%) , lemon-garlic (100%), garlic-mint (100%) & all plant mixture (1...

  14. 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.

  15. 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.

  16. 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...

  17. Exploration adjustment by ant colonies.

    Science.gov (United States)

    Doran, Carolina; Stumpe, Martin C; Sendova-Franks, Ana; Franks, Nigel R

    2016-01-01

    How do animals in groups organize their work? Division of labour, i.e. the process by which individuals within a group choose which tasks to perform, has been extensively studied in social insects. Variability among individuals within a colony seems to underpin both the decision over which tasks to perform and the amount of effort to invest in a task. Studies have focused mainly on discrete tasks, i.e. tasks with a recognizable end. Here, we study the distribution of effort in nest seeking, in the absence of new nest sites. Hence, this task is open-ended and individuals have to decide when to stop searching, even though the task has not been completed. We show that collective search effort declines when colonies inhabit better homes, as a consequence of a reduction in the number of bouts (exploratory events). Furthermore, we show an increase in bout exploration time and a decrease in bout instantaneous speed for colonies inhabiting better homes. The effect of treatment on bout effort is very small; however, we suggest that the organization of work performed within nest searching is achieved both by a process of self-selection of the most hard-working ants and individual effort adjustment. PMID:26909180

  18. Preference of food particle size among several urban ant species.

    Science.gov (United States)

    Hooper-Bùi, Linda M; Appel, Arthur G; Rust, Michael K

    2002-12-01

    Appropriate particle size may be a critical characteristic for effective granular ant baits. We examined the particle size preference of six species of pest ants to an anchovy-based bait. We also examined head capsule widths of Argentine ants, Linepithema humile (Mayr) (mean = 0.54 mm), California harvester ants, Pogonomyrmex californicus (Buckley) (mean = 1.63 mm), red imported fire ants, Solenopsis invicta Buren (mean = 0.9 mm), and southern fire ants, Solenopsis xyloni McCook (mean = 0.76 mm) and compared them with the first and second most preferred particle size. There were differences between particle size of which the most mass was removed and of which there were more particles removed by ants. California Argentine ants, southern fire ants, and Alabama Argentine ants removed more 840 to 1,000-microm particle mass of the anchovy diet but had more visits to dishes containing 420 to 590 microm particles. California harvester ants and Allegheny mound ants, Formica spp., removed more >2,000 microm particle mass but visited dishes containing 1,000 to 2,000 microm particles more often. Red imported fire ants also removed more >2,000 microm particle mass but visited dishes with 590 to 840-microm particles most often. Pharaoh ants, Monomorium pharaonis (L.), removed and visited 420 to 590-microm particles more than any other size. A linear regression model determined that particle size preferred by each ant species relates to forager head width. The majority of particles of commercial ant bait, including Amdro, Ascend, Award, Bushwhacker, Max Force with fipronil, and old and new formulations of Max Force with hydramethylnon, were 1,000 to 2,000 microm, but the majority of Niban particles were ant baits to fit the particle size preference of each pest ant species may increase the efficacy of ant baits. PMID:12539835

  19. No detection of Vairimorpha invictae in fire ant decapitating flies reared from V. invictae- infected ants

    Science.gov (United States)

    Vairimorpha invictae is a microsporidian entomopathogen that is under evaluation as a biological control agent for red imported fire ants, Solenopsis invicta. Infections of V. invictae alone and in combination with another pathogen of fire ants, Thelohania solenopsae, have resulted in declines of 5...

  20. 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.

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

    DEFF Research Database (Denmark)

    Offenberg, Hans Joachim

    2011-01-01

    can be combined with the use of the ants in biological control programmes in tropical plantations where pest insects are converted into ant biomass. To assess the cost-benefits of ant farming based on artificial feeding, food consumption and food conversion efficiency (ECI) of Oecophylla smaragdina......Oecophylla ants are sold at high prices on several commercial markets as a human delicacy, as pet food or as traditional medicine. Currently markets are supplied by ants collected from the wild; however, an increasing interest in ant farming exists as all harvest is easily sold and as ant farming...... (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...

  2. 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. PMID:15154488

  3. The distribution of weaver ant pheromones on host trees

    DEFF Research Database (Denmark)

    Offenberg, Joachim

    2007-01-01

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

  4. Ecology of a fig ant-plant

    Science.gov (United States)

    Harrison, Rhett D.

    2014-05-01

    Mutualistic interactions are embedded in networks of interactions that affect the benefits accruing to the mutualistic partners. Figs and their pollinating wasps are engaged in an obligate mutualism in which the fig is dependent on the fig pollinator for pollination services and the pollinator is dependent on fig ovules for brood sites. This mutualism is exploited by non-pollinating fig wasps that utilise the same ovules, but do not provide a pollination service. Most non-pollinating wasps oviposit from outside the inflorescence (syconium), where they are vulnerable to ant predation. Ficus schwarzii is exposed to high densities of non-pollinating wasps, but Philidris sp. ants patrolling the syconia prevent them from ovipositing. Philidris rarely catch wasps, but the fig encourages the patrolling by providing a reward through extra-floral nectaries on the surface of syconia. Moreover, the reward is apparently only produced during the phase when parasitoids are ovipositing. An ant-exclusion experiment demonstrated that, in the absence of ants, syconia were heavily attacked and many aborted as a consequence. Philidris was normally rare on the figs during the receptive phase or at the time of day when wasp offspring are emerging, so predation on pollinators was limited. However, Myrmicaria sp. ants, which only occurred on three trees, preyed substantially on pollinating as well as non-pollinating wasps. F. schwarzii occurs in small clusters of trees and has an exceptionally rapid crop turnover. These factors appear to promote high densities of non-pollinating wasps and, as a consequence, may have led to both a high incidence of ants on trees and increased selective pressure on fig traits that increase the payoffs of the fig-ant interaction for the fig. The fig receives no direct benefit from the reward it provides, but protects pollinating wasps that will disperse its pollen.

  5. 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. PMID:25788722

  6. Ant colony optimization algorithm for continuous domains based on position distribution model of ant colony foraging.

    Science.gov (United States)

    Liu, Liqiang; Dai, Yuntao; Gao, Jinyu

    2014-01-01

    Ant colony optimization algorithm for continuous domains is a major research direction for ant colony optimization algorithm. In this paper, we propose a distribution model of ant colony foraging, through analysis of the relationship between the position distribution and food source in the process of ant colony foraging. We design a continuous domain optimization algorithm based on the model and give the form of solution for the algorithm, the distribution model of pheromone, the update rules of ant colony position, and the processing method of constraint condition. Algorithm performance against a set of test trials was unconstrained optimization test functions and a set of optimization test functions, and test results of other algorithms are compared and analyzed to verify the correctness and effectiveness of the proposed algorithm. PMID:24955402

  7. 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...

  8. Improving the cAnt-MinerPB Classification Algorithm

    OpenAIRE

    Medland, Matthew; Otero, Fernando E. B.; Freitas, Alex A

    2012-01-01

    Ant Colony Optimisation (ACO) has been successfully applied to the classification task of data mining in the form of Ant-Miner. A new extension of Ant-Miner, called cAnt-MinerPB, uses the ACO procedure in a different fashion. The main difference is that the search in cAnt-MinerPB is optimised to find the best list of rules, whereas in Ant-Miner the search is optimised to find the best individual rule at each step of the sequential covering, producing a list of best rules. We aim to improve cA...

  9. Fossil evidence for the early ant evolution

    Science.gov (United States)

    Perrichot, Vincent; Lacau, Sébastien; Néraudeau, Didier; Nel, André

    2008-02-01

    Ants are one of the most studied insects in the world; and the literature devoted to their origin and evolution, systematics, ecology, or interactions with plants, fungi and other organisms is prolific. However, no consensus yet exists on the age estimate of the first Formicidae or on the origin of their eusociality. We review the fossil and biogeographical record of all known Cretaceous ants. We discuss the possible origin of the Formicidae with emphasis on the most primitive subfamily Sphecomyrminae according to its distribution and the Early Cretaceous palaeogeography. And we review the evidence of true castes and eusociality of the early ants regarding their morphological features and their manner of preservation in amber. The mid-Cretaceous amber forest from south-western France where some of the oldest known ants lived, corresponded to a moist tropical forest close to the shore with a dominance of gymnosperm trees but where angiosperms (flowering plants) were already diversified. This palaeoenvironmental reconstruction supports an initial radiation of ants in forest ground litter coincident with the rise of angiosperms, as recently proposed as an ecological explanation for their origin and successful evolution.

  10. Statistical Mechanics of Collective Transport by Ants

    Science.gov (United States)

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

    Collective decisions and cooperation within groups are essential for the survival of many species. Conflicts within the group must be suppressed but conformism may render the system unresponsive to new information. Collective transport by ants is therefore an ideal model system to study how animal groups optimize these opposing requirements. We combine experiments and theory to characterize the collective transport. The ants are modeled as binary Ising spins, representing the two roles ants can perform during transport. It turns out that the ants poise themselves collectively near a critical point where the response to a newly attached ant is maximized. We identify the size as being proportional to an inverse effective temperature and thus the system can exhibit a mesoscopic transition between order and disorder by manipulating the size. Constraining the cargo with a string makes the system behave as a strongly non-linear pendulum. Theoretically we predict that a Hopf bifurcation occurs at a critical size followed by a global bifurcation where full swings emerge. Remarkably, these theoretical predictions were verified experimentally.

  11. Early ant trajectories: spatial behaviour before behaviourism.

    Science.gov (United States)

    Wehner, Rüdiger

    2016-04-01

    In the beginning of the twentieth century, when Jacques Loeb's and John Watson's mechanistic view of life started to dominate animal physiology and behavioural biology, several scientists with different academic backgrounds got engaged in studying the wayfinding behaviour of ants. Largely unaffected by the scientific spirit of the time, they worked independently of each other in different countries: in Algeria, Tunisia, Spain, Switzerland and the United States of America. In the current literature on spatial cognition these early ant researchers-Victor Cornetz, Felix Santschi, Charles Turner and Rudolf Brun-are barely mentioned. Moreover, it is virtually unknown that the great neuroanatomist Santiago Ramón y Cajal had also worked on spatial orientation in ants. This general neglect is certainly due to the fact that nearly all these ant researchers were scientific loners, who did their idiosyncratic investigations outside the realm of comparative physiology, neurobiology and the behavioural sciences of the time, and published their results in French, German, and Spanish at rather inaccessible places. Even though one might argue that much of their work resulted in mainly anecdotal evidence, the conceptual approaches of these early ant researchers preempt much of the present-day discussions on spatial representation in animals. PMID:26898725

  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. Fusiones y adquisiciones en Europa: una asignatura pendiente

    Directory of Open Access Journals (Sweden)

    José Manuel Campa

    2004-01-01

    Full Text Available Las fusiones y adquisiciones transeuropeas es una de las asignaturas pendientes en la Unión Europea. Europa cuenta con una estructura empresarial muy fragmentada siguiendo fronteras nacionales y que requiere de una mayor integración para alcanzar dimensiones más apropiadas con el crecimiento de los mercados a nivel global para poder competir. Sin embargo, este proceso de consolidación a nivel europeo se está mostrando muy difícil. Además de las barreras culturales y sociales que dificultan esta integración existe un marco regulatorio que no presenta perspectivas de mejora a medio plazo. Como resultado, los mercados financieros suelen reaccionar negativamente ante el anuncio de compraventas internacionales entre empresas europeas.

  14. 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

  15. Il monitoraggio della qualità di vita e dei bisogni di pazienti oncologici e caregiver: il caso ANT

    OpenAIRE

    Roganti, Daniele

    2014-01-01

    La Fondazione ANT rappresenta una delle più ampie esperienze al mondo di assistenza socio-sanitaria gratuita a domicilio ai malati di tumore, tramite équipe di specialisti costituite da medici, psicologi e infermieri. La patologia oncologica ha un enorme impatto sul benessere dei pazienti. Un modo per raggruppare i diversi sintomi di disagio psicologico è utilizzare il concetto di distress, che sarebbe importante monitorare in modo semplice e veloce. Primo studio: 66 pazienti oncologic...

  16. Ecosystem services delivered by weaver ants

    DEFF Research Database (Denmark)

    Offenberg, Joachim

    other species are more likely to form trophobioses with hompteran species that act as disease vectors. Lastly, weaver ants are edible and easy to harvest. They can be utilized for protein production and harvested in significant amounts at the same time as they are managing insect pests. In other words...... 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.......Weaver ants (Oecopgylla spp.) are increasingly being utilized as efficient biocontrol agents in a number of tropical tree crops, as they prey on pest insects and increase yields. However, recent studies and a review of the literature reveal that a number of other services may derive from the...

  17. Swarm controlled emergence for ant clustering

    DEFF Research Database (Denmark)

    Scheidler, Alexander; Merkle, Daniel; Middendorf, Martin

    2013-01-01

    .g. moving robots, and clustering algorithms. Design/methodology/approach: Different types of control agents for that ant clustering model are designed by introducing slight changes to the behavioural rules of the normal agents. The clustering behaviour of the resulting swarms is investigated by extensive......Purpose: Swarm controlled emergence is proposed as an approach to control emergent effects in (artificial) swarms. The method involves the introduction of specific control agents into the swarm systems. Control agents behave similar to the normal agents and do not directly influence the behavior...... of the normal agents. The specific design of the control agents depends on the particular swarm system considered. The aim of this paper is to apply the method to ant clustering. Ant clustering, as an emergent effect, can be observed in nature and has inspired the design of several technical systems, e...

  18. 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 easily...... quantified and they tend to be similar in related species. Here we compare the mating strategies of the leaf-cutting ant Acromyrmex echinatior and its recently derived social parasite Acromyrmex insinuator, which is also its closest relative 2 (see Fig. 1 ). We find that although the host queens mate with up...... to a dozen different males, the social parasite mates only singly. This rapid and surprising reversion to single mating in a socially parasitic ant indicates that the costs of polyandry are probably specific to a free-living lifestyle....

  19. Desert ants learn vibration and magnetic landmarks.

    Directory of Open Access Journals (Sweden)

    Cornelia Buehlmann

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

  20. 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 of...... hydrocarbons present on the cuticle of every individual (the “label”). Recognition occurs when an ant encounters another individual, and compares the label it perceives to an internal representation of its own colony odor (the “template”). A mismatch between label and template leads to rejection of the...... encountered individual. Although advances have been made in our understanding of how the label is produced and acquired, contradictory evidence exists about information processing of recognition cues. Here, we review the literature on template acquisition in ants and address how and when the template is...

  1. Moribund Ants Do Not Call for Help.

    Science.gov (United States)

    Miler, Krzysztof

    2016-01-01

    When an antlion captures a foraging ant, the victim's nestmates may display rescue behaviour. This study tested the hypothesis that the expression of rescue behaviour depends on the life expectancy of the captured ant. This hypothesis predicts that the expression of rescue behaviour will be less frequent when the captured ant has a lower life expectancy than when it has a higher life expectancy because such a response would be adaptive at the colony level. Indeed, significant differences were found in the frequency of rescue behaviours in response to antlion victims with differing life expectancies. In agreement with prediction, victims with lower life expectancies were rescued less frequently, and those rescues had a longer latency and shorter duration. There was also a qualitative difference in the behaviour of rescuers to victims from the low and high life expectancy groups. Several explanations for these findings are proposed. PMID:26986741

  2. 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.

  3. Evaluación de la Intradermorreacción con Antígenos de Leishmania (Viannia) peruviana y Leishmania (Viannia) braziliensis en Áreas endémicas de Leishmaniasis en el Perú

    OpenAIRE

    G Minaya; Y Torres; Farfán, M.; L Mendizabal; M Colchado; Arroyo, E.

    1999-01-01

    Se elaboró extractos de antígenos solubles de Leishmania (leishmanina), a partir de formas promastigotes de Leishmania (Viannia) peruviana y Leishmania (Viannia) braziliensis. Los antígenos fueron evaluados respecto a su sensibilidad, especificidad y efectos colaterales. Los ensayos se llevaron a cabo en una área de transmisión de la "uta" (leishmaniasis andina), en un área de transmisión de la "espundia"(leishmaniasis selvática), y en pacientes atendidos en Lima. El antígeno de Leishmania (V...

  4. An ant's-eye view of an ant-plant protection mutualism.

    Science.gov (United States)

    Lanan, M C; Bronstein, J L

    2013-07-01

    Ant protection of extrafloral nectar (EFN)-secreting plants is a common form of mutualism found in most habitats around the world. However, very few studies have considered these mutualisms from the ant, rather than the plant, perspective. In particular, a whole-colony perspective that takes into account the spatial structure and nest arrangement of the ant colonies that visit these plants has been lacking, obscuring when and how colony-level foraging decisions might affect tending rates on individual plants. Here, we experimentally demonstrate that recruitment of Crematogaster opuntiae (Buren) ant workers to the EFN-secreting cactus Ferocactus wislizeni (Englem) is not independent between plants up to 5 m apart. Colony territories of C. opuntiae are large, covering areas of up to 5,000 m(2), and workers visit between five and 34 EFN-secreting barrel cacti within the territories. These ants are highly polydomous, with up to 20 nest entrances dispersed throughout the territory and interconnected by trail networks. Our study demonstrates that worker recruitment is not independent within large polydomous ant colonies, highlighting the importance of considering colonies rather than individual workers as the relevant study unit within ant/plant protection mutualisms. PMID:23515612

  5. Los simuladores como recurso educativo ante las consideraciones alternativas del Equilibrio Químico en estudiantes universitarios

    OpenAIRE

    Narciso Linares, Paula; Narciso Romero, Javier; Molina Jordá, José Miguel

    2015-01-01

    El Equilibrio Químico en todas sus vertientes (reacciones de oxidación- reducción, comportamiento ácido-base, principio de Le Chatelier, etc.) es uno de los conceptos esenciales de la Química y es la base para la comprensión de una amplia gama de situaciones de interés en dicho campo. Por lo tanto es fundamental que el alumno alcance esa destreza-concepto lo antes posible, lo que conlleva que sea necesaria una revisión metodológica para adaptarse a los nuevos tiempos y a las nuevas necesidade...

  6. El procesamiento de la información de las personas mayores y su actitud ante el anuncio

    OpenAIRE

    Estrada Guillén, Marta; Sánchez García, Javier; Fandos Roig, Juan Carlos

    2011-01-01

    El envejecimiento poblacional es un hecho de gran transcendencia socioeconómica con importantes repercusiones empresariales. Es importante el análisis del consumidor mayor y de sus particularidades para la consecución de una efectiva comunicación publicitaria. En este trabajo se analizan los antecedentes de la actitud ante el anuncio de las personas mayores y sus consecuencias sobre la actitud hacia la marca y la intención de compra en condiciones de baja implicación con el anuncio. Sobre una...

  7. El inmigrante ante la sanción penal = The immigrant in front of the penal sanction

    OpenAIRE

    Salvador Concepción, Rosa

    2014-01-01

    Al analizar distintas cuestiones de importancia referentes al tratamiento legal de la inmigración en nuestro país una de las cuestiones de mayor envergadura que se plantea va a ser el régimen en el que se encuentran estos extranjeros ante un enjuiciamiento por la comisión de una infracción delictiva, siendo éste además diferente cuando el inmigrante es adulto o cuando es menor de edad. Por este motivo en las siguientes líneas vamos a estudiar este tratamiento penal del inmigrante, primeram...

  8. 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.

  9. Recruitment strategies and colony size in ants.

    Directory of Open Access Journals (Sweden)

    Robert Planqué

    Full Text Available Ants use a great variety of recruitment methods to forage for food or find new nests, including tandem running, group recruitment and scent trails. It has been known for some time that there is a loose correlation across many taxa between species-specific mature colony size and recruitment method. Very small colonies tend to use solitary foraging; small to medium sized colonies use tandem running or group recruitment whereas larger colonies use pheromone recruitment trails. Until now, explanations for this correlation have focused on the ants' ecology, such as food resource distribution. However, many species have colonies with a single queen and workforces that grow over several orders of magnitude, and little is known about how a colony's organization, including recruitment methods, may change during its growth. After all, recruitment involves interactions between ants, and hence the size of the colony itself may influence which recruitment method is used--even if the ants' behavioural repertoire remains unchanged. Here we show using mathematical models that the observed correlation can also be explained by recognizing that failure rates in recruitment depend differently on colony size in various recruitment strategies. Our models focus on the build up of recruiter numbers inside colonies and are not based on optimality arguments, such as maximizing food yield. We predict that ant colonies of a certain size should use only one recruitment method (and always the same one rather than a mix of two or more. These results highlight the importance of the organization of recruitment and how it is affected by colony size. Hence these results should also expand our understanding of ant ecology.

  10. Ant-gardens of tropical Asian rainforests

    Science.gov (United States)

    Kaufmann, Eva; Maschwitz, Ulrich

    2006-05-01

    Ant-garden (AG) associations are systems of epiphytic plants and arboricolous (i.e., tree-living) ants, in which the ants build fragile carton nests containing organic material. They collect and incorporate seeds or fruits of epiphytes that then germinate and grow on the nest [sensu Corbara et al. (1999) 38:73-89]. The plant roots stabilize the nest carton. AGs have been well-known in the neotropics for more than 100 years. In contrast, reports on similar associations in the paleotropics are scarce so far. After discovering a first common AG system on giant bamboo [Kaufmann et al. (2001) 48:125-133], we started a large-scale survey for AGs in Peninsular Malaysia, Borneo, Java, and southern Thailand. A great variety of AG systems (altogether including 18 ant species and 51 plant species) was discovered and is described in the present paper. The high number of species participating in AG associations was reflected by a great variability in the specific appearances of the nest gardens. Frequently, further groups of organisms (e.g., hemipteran trophobionts, fungi) were also involved. Preference patterns of particular ant and epiphyte species for each other and for particular phorophytes (carrier trees) were detected. We integrate domatia-producing, so-called ant-house epiphytes in our study and compare their phases of establishment, as well as other characteristics, to “classical” AGs, coming to the conclusion that they should be regarded only as a special type of AG epiphyte and not as a separate ecological category.

  11. 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.

  12. Fuzzy system identification via chaotic ant swarm

    International Nuclear Information System (INIS)

    In this paper, we introduce a chaotic optimization method, called CAS (chaotic ant swarm), to solve the problem of designing a fuzzy system to identify dynamical systems. The position vector of each ant in the CAS algorithm corresponds to the parameter vector of the selected fuzzy system. At each learning time step, the CAS algorithm is iterated to give the optimal parameters of fuzzy systems based on the fitness theory. Then the corresponding CAS-designed fuzzy system is built and applied to the identification of the unknown nonlinear dynamical systems. Numerical simulation results are provided to show the effectiveness and feasibility of the developed CAS-designed fuzzy system.

  13. Bus Network Modeling Using Ant Algorithms

    Directory of Open Access Journals (Sweden)

    Sepideh Eshragh

    2010-02-01

    Full Text Available Bus transit network modeling is a complex and combinatorial problem. The main purpose of this paper is to apply a contemporary method for designing a bus transit network with the objective of achieving optimum results. The method is called Ant Algorithms, a Meta Heuristic method, which has been applied to optimization problems in transportation with noticeable success. The description of the algorithm, as well as the main methodology and computations, is presented in this paper. Furthermore, a case study using Ant Algorithms applied to the city of Ghazvin, one of the most important suburbs of Tehran, Iran, is presented.

  14. Sobre: Julio Ortega Bobadilla, Foucault ante Freud

    OpenAIRE

    Zavaleta Betancourt, José Alfredo; IIH-S, Universidad Veracruzana, Xalapa, Ver.

    2014-01-01

    Desde el título, Foucault ante Freud es un texto elíptico. Quizá debería titularse Foucault contra Freud o bien Freud ante Foucault o, mejor, Freud a pesar de Foucault. Ortega describe el contexto de las relaciones discursivas de Foucault con mÚltiples autores que lo influyeron: modelos ejempla- res, mentores o aliados, y es vasta la información que utiliza para reconstruir el contexto de esta lucha discursiva. 

  15. Lithiase géante sur enterocystoplastie

    OpenAIRE

    Elmortaji, Khalid; Elomri, Ghassane; Bennani, Saad; Rabii, Redouane; Aboutaib, Rachid; Meziane, Fethi

    2014-01-01

    La formation des lithiases est une complication fréquente des entérocystoplasties après cystectomie radicale pour tumeur de vessie infiltrante. Le délai d'apparition dépend des facteurs de risque favorisants notamment les infections urinaires. Néanmoins la survenue de lithiase géante sur néovessie reste exceptionnelle, seulement 5 cas ont été rapportés dans la littérature. Nous rapportons dans ce travail, le cas d'une lithiase géante compliquant une entérocystoplastie chez un malade suivi pou...

  16. Kin-informative recognition cues in ants

    DEFF Research Database (Denmark)

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

    2011-01-01

    found little or no kin information in recognition cues. Here, we test the hypothesis that social insects do not have kin-informative recognition cues by investigating the recognition cues and relatedness of workers from four colonies of the ant Acromyrmex octospinosus. Contrary to the theoretical...... prediction, we show that the cuticular hydrocarbons of ant workers in all four colonies are informative enough to allow full-sisters to be distinguished from half-sisters with a high accuracy. These results contradict the hypothesis of non-heritable recognition cues and suggest that there is more potential...

  17. The ejaculatory biology of leafcutter ants

    DEFF Research Database (Denmark)

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

    2015-01-01

    The eusocial ants are unique in that females (queens) acquire and store sperm on a single mating flight early in adult life. This event largely determines the size (possibly millions of workers), longevity (possibly decades) and genetic variation of the colonies that queens found, but our...... 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 of the...

  18. GrAnt: Inferring Best Forwarders from Complex Networks' Dynamics through a Greedy Ant Colony Optimization

    OpenAIRE

    Kochem Vendramin, Ana Cristina; Munaretto, Anelise; Regattieri Delgado, Myriam; Carneiro Viana, Aline

    2011-01-01

    This paper presents a new prediction-based forwarding protocol for the complex and dynamic Delay Tolerant Networks (DTN). The proposed protocol is called GrAnt (Greedy Ant) as it uses a greedy transition rule for the Ant Colony Optimization (ACO) metaheuristic to select the most promising forwarder nodes or to provide the exploitation of good paths previously found. The main motivation for the use of ACO is to take advantage of its population-based search and of the rapid adaptation of its le...

  19. Predation by ants on arthropods and other animals

    OpenAIRE

    Cerdá, Xim; Dejean, A

    2011-01-01

    Ants are the most widely distributed and most numerically abundant group of social insects. First, they were ground- or litter-dwelling predators or scavengers, and certain taxa evolved to adopt an arboreal way of life. Most ant species are generalist feeders, and only some ground-nesting and ground- foraging species are strictly predators. Ants are central-place foragers (with the exception of army ants during the nomadic phase) that may use different foraging strategies. Solitary hunting is...

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

    OpenAIRE

    Hsun-Yi Hsieh; Ivette Perfecto

    2012-01-01

    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...

  1. Liquid baits control Argentine ants sustainably in coastal vineyards

    OpenAIRE

    Cooper, Monica L; Daane, Kent M.; Nelson, Erik H; Varela, Lucia G; Battany, Mark; Tsutsui, Neil D.; Rust, M K

    2008-01-01

    Liquid ant baits are an alternative to broad-spectrum insecticide sprays conventionally used to control Argentine ants. We review the development of liquid ant baits, which capitalize on the ants’ sugar-feeding requirements and social structure to deliver small doses of toxicant throughout the colony. The ant bait program described here, developed for commercial vineyards, also has the potential to facilitate the use of biological controls for mealybug and scale pests. The implementation of a...

  2. Millipede defense: use of detachable bristles to entangle ants.

    OpenAIRE

    Eisner, T.; Eisner, M; Deyrup, M.

    1996-01-01

    The millipede Polyxenus fasciculatus (Diplopoda; Polyxenida) defends itself against ants by use of a pair of bristle tufts at its rear. When attacked, it wipes the tufts against the ants, thereby causing these to become encumbered by bristles that detach from the tufts. Ants contaminated with bristles desist from their assault. The bristles have grappling hooks at the tip by which they lock onto setae of the ants and barbs along their length by which they interlink. In attempting to rid thems...

  3. Tracing the Rise of Ants - Out of the Ground

    OpenAIRE

    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 ...

  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. Ant-Crypto, a Cryptographer for Data Encryption Standard

    OpenAIRE

    Salabat Khan; Armughan Ali; Mehr Yahya Durrani

    2013-01-01

    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 tech...

  6. Optimized Ant Colony Algorithm by Local Pheromone Update

    OpenAIRE

    Hui Yu

    2013-01-01

    Ant colony algorithm, a heuristic simulated algorithm, provides better solutions for non-convex, non-linear and discontinuous optimization problems. For ant colony algorithm, it is frequently to be trapped into local optimum, which might lead to stagnation. This article presents the  city-select strategy, local pheromone update strategy, optimum solution prediction strategy and local optimization strategy to optimize ant colony algorithm, provides ant colony algorithm based on local pheromone...

  7. The ant colony metaphor in continuous spaces using boundary search

    OpenAIRE

    Leguizamón, Guillermo

    2003-01-01

    This paper presents an application of the ant colony metaphor for continuous space optimization problems. The ant algortihm proposed works following the principle of the ant colony approach, i.e., a population of agents iteratively, cooperatively, and independently search for a solution. Each ant in the distributed algorithm applies a local search operator which explores the neighborhood region of a particular point in the search space (individual search level). The local search operator i...

  8. Estudio del comportamiento del ozono superficial en la base antártica de Belgrano

    OpenAIRE

    Navarro Comas, Mónica

    2015-01-01

    [ES]La presente investigación recoge un exhaustivo examen del comportamiento del ozono superficial y de los eventos significativos de disminución de ozono (ODEs) que tienen lugar en Belgrano (77º 52' S, 34º 37' O), una región poco explorada del mar de Weddell. El análisis ha sido realizado a partir de los datos de ozono en superficie y perfiles de ozono proporcionados por los ozonosondeos realizados en la base Antártica de Belgrano. En el estudio se han empleado otros datos complementarios, t...

  9. Colombia ante el ALCA y los desafíos para la Comunidad Andina de Naciones

    OpenAIRE

    Roberto González Arana

    2003-01-01

    En este trabajo se analizan avances y retrocesos de la Comunidad Andina de cara a la creación de un Área de Libre Comercio para América LatinaALCA. Para ello se han tomado como eje los últimos dos años, período signado por importantes hechos, como son el arribo de nuevos gobiernos ala región y la definición de una política homogénea ante las negociaciones con el resto de América .

  10. ESTRATEGIAS DE AFRONTAMIENTO ANTE EL ESTRÉS Y RENDIMIENTO ACADÉMICO EN ESTUDIANTES UNIVERSITARIOS

    OpenAIRE

    José Alberto Martínez González

    2010-01-01

    El nuevo Espacio Europeo de Educación Superior (EEES) constituye un contexto de estrés para los estudiantes universitarios, habida cuenta de los nuevos cambios y protagonismos a los que los alumnos deberán enfrentarse. Resulta por tanto necesario conocer qué estrategias de afrontamiento usan los estudiantes universitarios para gestionar el estrés educativo y generar programas de prevención y de intervención, incluso antes de que alcancen esta etapa educativa. Hemos estudiado en una muestra de...

  11. Aplicación del Checklist de la OMS para evaluar la preparación ante desastres del Hospital de Cabueñes

    OpenAIRE

    Marinas Vaquero, Noelia

    2012-01-01

    El hospital de cabueñes desarrolla su actividad diaria ante una gran presión asistencial. Una puntual catástrofe podría disminuir su calidad de atención a todos sus habituales usuarios y heridos de una emergencia. El plan de catástrofes que se activaría en el hospital para cubrir todas las necesidades y dar cobertura a los damnificados debe estar bien formulado. Se utilizará el Hospital Emergency Response Checklist de la OMS y la Guía para la elaboración de planes de catástrofes en hospit...

  12. 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 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...... 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...

  13. Dynamics of an ant-plant-pollinator model

    Science.gov (United States)

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

    2015-03-01

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

  14. Fire ant control with Entomopathogens in the USA

    Science.gov (United States)

    Fire ants, Solenopsis richteri and Solenopsis invicta, are stinging invasive ants from South America that infest over 129.5 million hectares in the southern United States. In the southern U.S., eradication is no longer considered possible and toxicant-based fire ant baiting is currently the primary...

  15. 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

  16. 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. PMID:24392817

  17. Extreme Morphogenesis and Ecological Specialization among Cretaceous Basal Ants.

    Science.gov (United States)

    Perrichot, Vincent; Wang, Bo; Engel, Michael S

    2016-06-01

    Ants comprise one lineage of the triumvirate of eusocial insects and experienced their early diversification within the Cretaceous [1-9]. Their ecological success is generally attributed to their remarkable social behavior. Not all ants cooperate in social hunting, however, and some of the most effective predatory ants are solitary hunters with powerful trap jaws [10]. Recent evolutionary studies predict that the early branching lineages of extant ants formed small colonies of ground-dwelling, solitary specialist predators [2, 5, 7, 11, 12], while some Cretaceous fossils suggest group recruitment and socially advanced behavior among stem-group ants [9]. We describe a trap-jaw ant from 99 million-year-old Burmese amber with head structures that presumably functioned as a highly specialized trap for large-bodied prey. These are a cephalic horn resulting from an extreme modification of the clypeus hitherto unseen among living and extinct ants and scythe-like mandibles that extend high above the head, both demonstrating the presence of exaggerated morphogenesis early among stem-group ants. The new ant belongs to the Haidomyrmecini, possibly the earliest ant lineage [9], and together these trap-jaw ants suggest that at least some of the earliest Formicidae were solitary specialist predators. With their peculiar adaptations, haidomyrmecines had a refined ecology shortly following the advent of ants. PMID:27238278

  18. Tomb evaders: house-hunting hygiene in ants

    OpenAIRE

    Franks, Nigel R; Hooper, James; Webb, Catherine; Dornhaus, Anna

    2005-01-01

    House-hunting ants avoid otherwise excellent potential nest sites that contain dead ants which may pose risks from poor hygiene. This discovery adds another category to the exceptionally long list of nest site attributes that ants evaluate. It further indicates the importance of disease as a selection pressure on social insects.

  19. 7 CFR Appendix to Subpart - Imported Fire Ant

    Science.gov (United States)

    2010-01-01

    ... 7 Agriculture 5 2010-01-01 2010-01-01 false Imported Fire Ant Appendix to Subpart Agriculture..., DEPARTMENT OF AGRICULTURE DOMESTIC QUARANTINE NOTICES Imported Fire Ant Quarantine and Regulations Costs and charges. Pt. 301, Subpt., App. Appendix to Subpart—Imported Fire Ant III. Regulatory Procedures...

  20. Nematode Parasites and Associates of Ants: Past and Present

    OpenAIRE

    George Poinar

    2012-01-01

    Ants can serve as developmental, definitive, intermediate, or carrier hosts of a variety of nematodes. Parasitic ant nematodes include members of the families Mermithidae, Tetradonematidae, Allantonematidae, Seuratidae, Physalopteridae, Steinernematidae, and Heterorhabditidae. Those nematodes that are phoretically associated with ants, internally or externally, are represented by the Rhabditidae, Diplogastridae, and Panagrolaimidae. Fossils of mermithids, tetradonematids, allantonematids, and...

  1. 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, fuelled...

  2. Model Specification Searches Using Ant Colony Optimization Algorithms

    Science.gov (United States)

    Marcoulides, George A.; Drezner, Zvi

    2003-01-01

    Ant colony optimization is a recently proposed heuristic procedure inspired by the behavior of real ants. This article applies the procedure to model specification searches in structural equation modeling and reports the results. The results demonstrate the capabilities of ant colony optimization algorithms for conducting automated searches.

  3. New results of ant algorithms for the Linear Ordering Problem

    OpenAIRE

    Pintea, Camelia-M.; Chira, Camelia; Dumitrescu, D.

    2012-01-01

    Ant-based algorithms are successful tools for solving complex problems. One of these problems is the Linear Ordering Problem (LOP). The paper shows new results on some LOP instances, using Ant Colony System (ACS) and the Step-Back Sensitive Ant Model (SB-SAM).

  4. A Novel delivery Method for Ant (Hymenoptera: Formicidae) toxicants

    Science.gov (United States)

    Described here is a new delivery method for ant toxicants consisting of an inert carrier, an attractant, and a toxicant. Unlike baits, this system does not contain a food source, but uses ant to ant contact rather than trophallaxis as the mechanism for horizontal dispersal of the toxicant through th...

  5. 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.

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

    OpenAIRE

    Ballantyne, Gavin Andrew; Willmer, Patricia Gillian

    2012-01-01

    As flower visitors, ants rarely benefit a plant. They are poor pollinators, and can also disrupt pollination by deterring other flower visitors, or by stealing nectar. Some plant species therefore possess floral ant-repelling traits. But why do particular species have such traits when others do not? In a dry forest in Costa Rica, of 49 plant species around a third were ant-repellent at very close proximity to a common generalist ant species, usually via repellent pollen. Repellence was positi...

  7. 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

  8. 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

  9. 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

  10. 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

  11. The worldwide expansion of the Argentine ant

    DEFF Research Database (Denmark)

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

    2010-01-01

    the native range) 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...

  12. Water surface locomotion in tropical canopy ants.

    Science.gov (United States)

    Yanoviak, S P; Frederick, D N

    2014-06-15

    Upon falling onto the water surface, most terrestrial arthropods helplessly struggle and are quickly eaten by aquatic predators. Exceptions to this outcome mostly occur among riparian taxa that escape by walking or swimming at the water surface. Here we document sustained, directional, neustonic locomotion (i.e. surface swimming) in tropical arboreal ants. We dropped 35 species of ants into natural and artificial aquatic settings in Peru and Panama to assess their swimming ability. Ten species showed directed surface swimming at speeds >3 body lengths s(-1), with some swimming at absolute speeds >10 cm s(-1). Ten other species exhibited partial swimming ability characterized by relatively slow but directed movement. The remaining species showed no locomotory control at the surface. The phylogenetic distribution of swimming among ant genera indicates parallel evolution and a trend toward negative association with directed aerial descent behavior. Experiments with workers of Odontomachus bauri showed that they escape from the water by directing their swimming toward dark emergent objects (i.e. skototaxis). Analyses of high-speed video images indicate that Pachycondyla spp. and O. bauri use a modified alternating tripod gait when swimming; they generate thrust at the water surface via synchronized treading and rowing motions of the contralateral fore and mid legs, respectively, while the hind legs provide roll stability. These results expand the list of facultatively neustonic terrestrial taxa to include various species of tropical arboreal ants. PMID:24920838

  13. 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.

  14. Histrionicotoxin alkaloids finally detected in an ant

    DEFF Research Database (Denmark)

    Jones, Tappey H.; Adams, Rachelle Martha Marie; Spande, Thomas F.; Garraffo, H. Martin; Kaneko, Tetsuo; Schultz, Ted R.

    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...

  15. The Kanizsa triangle illusion in foraging ants.

    Science.gov (United States)

    Sakiyama, Tomoko; Gunji, Yukio-Pegio

    2016-01-01

    The Kanizsa triangle, wherein three Pac-Man configurations symmetrically face inwards, is a well-known illusion. By exposing foraging ants (Lasius niger) to Kanizsa-shaped honeydew solutions, we studied the origin of this illusion. More specifically, we examined whether foraging ants showed different movement reactions to local honeydew patterns formed by nestmates. This novel phenomenon could serve as an abstract model of the Kanizsa triangle illusion under the assumption that such an illusion could arise through the sum of each agent's limited global cognitions, because each agent could not perceive the entire subjective contours. Even a subjective consciousness consists of some parts which have no identical perception and could be an illusion. We succeeded in inducing foragers to move along the sides of a Kanizsa triangle when Pac-Man-shaped inducers were introduced. Furthermore, foragers appeared to form Y-shaped trajectories when dot-shaped or inverse Kanizsa inducers were used. Based on our findings, we propose an agent-based ant model that compares modelled behaviour with experimental phenomena. Our abstract model could be used to explain such cognitive phenomena for bottom-up processes, because ants cannot perceive the given subjective contours, instead simply move along the edges. PMID:26930477

  16. 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...

  17. Fungal enzymes in the attine ant symbiosis

    DEFF Research Database (Denmark)

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

    build huge nests displacing several cubic meters of soil, whereas lower attine genera such as Cyphomyrmex and Mycocepurus have small nests with a fungus garden the size of a table-tennis ball. Only the leaf-cutter ants are specialized on using fresh leaves as substrate for their fungus gardens, whereas...

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

    OpenAIRE

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

    2010-01-01

    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 (Pachycondyla goeldii and Camponotus...

  19. TestAnt: an ant colony system approach to sequential testing under precedence constraints

    OpenAIRE

    Çatay, Bülent; Catay, Bulent; Özlük, Özgür; Ozluk, Ozgur; Ünlüyurt, Tonguç; Unluyurt, Tonguc

    2011-01-01

    We consider the problem of minimum cost sequential testing (diagnosis) of a series (or parallel) system under precedence constraints. We model the problem as a nonlinear integer program. We develop and implement an ant colony algorithm for the problem. We demonstrate the performance of this algorithm for special type of instances for which the optimal solutions can be found in polynomial time. In addition, we compare the performance of the ant colony algorithm with a branch and bound algorith...

  20. 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. PMID:27512148

  1. 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

  2. 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.

  3. 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-ant-dependent o......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...

  4. Caracterización estructural y funcional del Antígeno B de Echinococcus granulosus

    OpenAIRE

    Silva Álvarez, María Valeria

    2014-01-01

    El antígeno B (EgAgB) es una lipoproteína presente en la larva del parásito cestodo Echinococcus granulosus, agente causante de la zoonosis conocida como hidatidosis, enfermedad endémica en nuestra región. Esta proteína pertenece a una familia de proteínas exclusivas de cestodos que unen ligandos hidrofóbicos, conocidas como HLBPs. A nivel proteico, el EgAgB está formado por subunidades de ~8 kDa codificadas por genes polimórficos pertenecientes a 5 subfamilias distintas (EgAgB8/1 a EgAgB8/5)...

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

    Directory of Open Access Journals (Sweden)

    Edgar Chirinos

    2015-06-01

    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.

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

    OpenAIRE

    Baldellou Plaza, Angela

    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...

  7. 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.

  8. 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

  9. Expresi??n de ant??genos HLA clase I e infecci??n por papilomavirus humano tipo 16 en la neoplasia cervical uterina y lesiones precursoras

    OpenAIRE

    Torres Garc??a, Luis Manuel

    1992-01-01

    Sobre una casu??stica de 109 diagn??sticos de diferentes entidades nosologicas de cervix uterino, se determina la presencia de ant??genos hla clase i mediante la t??cnica de la inmunoperoxidasa, encontrando que tanto el epitelio normal como los condilomas y las lesiones intraepiteliales conservan la expresi??n de estos ant??genos, mientras que los tumores invasores pierden esta capacidad en el 15% de los casos, correlacion??ndose con la invasi??n del estroma y un aumento de su malignidad. Se ...

  10. Construcción de conocimiento profesional de agentes educativos ante situaciones de violencia en sus contextos de práctica

    OpenAIRE

    Dome, Carolina

    2013-01-01

    El presente trabajo se enmarca en una línea de indagación sobre el problema de la construcción de conocimiento profesional por parte de agentes psico-educativos (psicólogos/as, orientadores/as, maestros/as y trabajadores sociales, todos con especialización en psicología en el área de posgrado) ante situaciones y problemas de violencias en contextos de práctica profesional. Los agentes psico- educativos suelen ser convocados a intervenir ante las situaciones de violencia que emergen en las esc...

  11. 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.

  12. 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.

  13. Hacia una nueva generación de repositorios

    OpenAIRE

    Rodrigues, Eloy

    2016-01-01

    El crecimiento del número de repositorios en la última década ha sido impresionante. Hoy existen repositorios en casi todas las principales instituciones de investigación y educación superior en el mundo, y eso puede ser la base para una infraestructura global, distribuida y en red para la comunicación académica. Sin embargo, las plataformas de repositorios siguen utilizando tecnologías y protocolos diseñados hace casi veinte años, antes del boom de la web, del dominio de Google, de las redes...

  14. Los sistemas complejos: una perspectiva contemporánea

    OpenAIRE

    J. Figueroa Nazuno

    2008-01-01

    Hasta antes de la década de los años 50, los problemas centrales en la investigación científica estaban orientados y limitados al problema dimensional; es decir, el estudio de lo más grande y lo muy pequeño. Desde un punto de vista conceptual, las tareas científicas estaban dirigidas al desarrollo de instrumentos físicos o conceptuales para el estudio de estos dos grandes horizontes del conocimiento. En la actualidad, una serie de eventos -en cierta forma inconexos-han orientado la búsqueda d...

  15. Borges: una lectura budista cristianismo, sujeto y lenguaje

    OpenAIRE

    Godoy Tusso, Juan Carlos

    2012-01-01

    El pensamiento moderno, ha concentrado su pensamiento a la conceptualización excesiva del mundo natural y del mundo sensible. Los posibles sistemas filosóficos que guiasen una nueva forma de habitar con y en el mundo han caído en estrictos formalismos positivistas, aislándose cada vez más de la vida y del hombre mismo. Es menester, según gran parte de los elementos literarios de la obra de Borges, retornar a ese estadio de los objetos antes de ser nombrados, a lo que todavía no significa para...

  16. Compromiso organizacional en una muestra de trabajadores mexicanos

    OpenAIRE

    NORMA BETANZOS DÍAZ; PATRICIA ANDRADE PALOS; FRANCISCO PAZ RODRÍGUEZ

    2006-01-01

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

  17. Una Meditación de la Ciencia

    OpenAIRE

    Raúl FORNET-BETANCOURT

    2007-01-01

    Haciendo una crítica intercultural a la ciencia moderna, el autor del artículo proponepensar la ciencia como un pensar meditativo que recobra el sentido y que se percata del significado de su tarea ante la ciencia, por ello toma conciencia de que debe ir más allá de la crítica. Para esta crítica no basta con censurar o poner de manifiesto las desviaciones de la ciencia en sus aplicaciones, sino que hay que sobrepasar este horizonte, poniendo a la ciencia en su lugar. Saber, sin embargo, qué l...

  18. Bioturbation by Fire Ants in the Coastal Prairie of Texas

    Science.gov (United States)

    Cameron, G.; Williams, L.

    2001-12-01

    Fire ants (Solenopsis invicta) were introduced to the US in the early part of the last century. They have spread throughout the southeastern US in the absence of native competitors and predators with a range limited by abiotic factors. Each fire ant mound contains thousands of individuals, can be large, and can be numerous enough to comprise a dominant feature of the landscape. Studies of this species have focused upon its spread, formation of single- and multiple-queen colonies, genetic structure, and impact on native fauna and human health. Some studies have analyzed native fire ant-soil interactions, but few studies have examined the process of bioturbation by introduced fire ants in native ecosystems. Fire ants on the coastal prairie of Texas primarily are of the multiple-queen type that exhibit a much higher density of mounds than the single-queen type. Consequently, mound-building activities by fire ants can have a marked effect upon soil structure and nutrient content and may affect soil organisms and plants. Fire ant activity, mound density, mound dispersion, soil texture, soil permeability, soil moisture content, and soil nutrients were measured. Fire ants mounds are visible aboveground from April-November. Density of mounds was 117-738/ha, and average mound lifespan was 3.6 months with only 9% of the mounds remaining active throughout the entire season. Mounds were dispersed randomly. Foraging activity by fire ants was from June through October with a peak in July. Annual soil turnover was estimated by collecting and weighing mounds. There was no effect of ant mounds on soil texture, but water infiltration was higher in areas with ant mounds. Early-season samples showed no nutrient differences, but late-season samples showed that ant mounds contained higher amounts of micronutrients than random samples of soil. These data are compared to similar data on effects of mounds from native ants and from native and introduced ants in different habitats.

  19. Criptosporidiosis: una zoonosis parasitaria

    OpenAIRE

    Claudia Vergara; Joaquín Quílez

    2004-01-01

    La criptosporidiosis es una enfermedad parasitaria producida por protozoos coccidios pertenecientes al género Cryptosporidium . Su importancia se puso de manifiesto a comienzos de los años 1980 por lo que puede considerarse una patología de conocimiento relativamente reciente, aunque actualmente se ha demostrado que es una de las infecciones entéricas más frecuentes en humanos y animales y un problema de salud pública en todo el mundo (Casemore et al. 1997). La especie de mayor interés ...

  20. Construyendo una nueva ciudad

    OpenAIRE

    Ariza, Jaison Fernando; Ferro, Edwin David

    2012-01-01

    La presente propuesta está fundamentada en una serie de actividades estructuradas en un proyecto de aula llamado Construyendo una nueva ciudad, gestionado en un Instituto Educativo Distrital, con el fin de potenciar el pensamiento geométrico y los sistemas de medidas en estudiantes de grado cuarto, a partir de la planeación y elaboración de una maqueta que implican el uso de sistemas de coordenadas, la noción de área, perímetro, la aplicación de proporcionalidad, entre otros aspectos.

  1. Aportaciones educativas del Tercer Mundo ante el tercer milenio

    Directory of Open Access Journals (Sweden)

    María Isabel Miró Montoliu

    1998-01-01

    Full Text Available Después de una introducción sobre las actitudes ante el nuevo milenio, el artículo se estructura en cuatro grandes apartados. Se aborda primeramente la realidad actual y la problemática propia del Tercer Mundo aportando datos recientes y expresivos al respecto. A partir de ahí, se re flexiona sobre el Desarrollo Social necesario y las políticas convenientes a seguir en consecuencia, considerando que la educación es la clave en que radica el motor fundamental para encontrar modelos innovadores que puedan superar los obstáculos que impiden la evolución perfectiva de la humanidad. El cuarto apartado incide en el espíritu que debe animar las acciones de ayuda al Tercer Mundo que es el de la COOPERACION y la INTERCULTURALlDAD resaltando los beneficios mutuos del contacto entre los países del mundo desarrollado y aquellos otros, con escasos bienes económicos . pero con valores culturales propios que pueden aportar su riqueza experimental y existencial a la uniformidad del pensamiento único e instrumental predominante en el mundo occidental. 

  2. Field tests of interspecific competition in ant assemblages: revisiting the dominant red wood ants.

    Science.gov (United States)

    Gibb, Heloise; Johansson, Therese

    2011-05-01

    1. There has been considerable debate on the importance of competition in ecological communities, but its importance in structuring ant assemblages has often been uncritically accepted. Here, we briefly review field experiments examining competition in ant assemblages and use a removal experiment to test the effect of the classical territorial dominant ant, Formica aquilonia. Ants of this species group are thought to structure communities through a dominance hierarchy. 2. First, we used pitfall traps to compare the abundance of other ants in replicated sites with low and high densities of F. aquilonia. We found differences in community composition, in particular, Camponotus herculeanus was more common in low-density sites, in accordance with predictions. Differences in ant assemblages were not owing to differences in measured habitat variables. 3. We removed F. aquilonia from a set of high-density sites, using physical and chemical methods, and repeated these procedures at procedural control sites. One year after removal, abundances of F. aquilonia at removal sites were similar to those at low-density sites. However, the composition of other species did not change in response to F. aquilonia removal. Replication rates were identical in the mensurative and experimental components of this study, so this is unlikely to be owing to the analysis being insufficiently powerful. 4. We suggest three possibilities for the lack of difference. First, the study may have been too short term or small scale to detect differences. However, previous studies have shown effects on smaller spatial- and temporal-scales. Second, priority effects may be important in the successful colonisation by F. aquilonia. Thirdly, boreal ant assemblages may be too depauperate for redundancy in ecological roles and for competition to play an important structuring role. 5. We thus recommend that long-term large-scale experiments be considered essential if we are to distinguish between competing

  3. Various Chemical Strategies to Deceive Ants in Three Arhopala Species (Lepidoptera: Lycaenidae) Exploiting Macaranga Myrmecophytes

    OpenAIRE

    Inui, Yoko; Shimizu-kaya, Usun; Okubo, Tadahiro; Yamsaki, Eri; Itioka, Takao

    2015-01-01

    Macaranga myrmecophytes (ant-plants) are generally well protected from herbivore attacks by their symbiotic ants (plant-ants). However, larvae of Arhopala (Lepidoptera: Lycaenidae) species survive and develop on specific Macaranga ant-plant species without being attacked by the plant-ants of their host species. We hypothesized that Arhopala larvae chemically mimic or camouflage themselves with the ants on their host plant so that the larvae are accepted by the plant-ant species of their host....

  4. Low-toxicity baits control ants in citrus orchards and grape vineyards

    OpenAIRE

    Tollerup, Kris E.; Rust, Michael K.; Dorschner, Keith W.; Phillips, Phil A.; Klotz, John H.

    2004-01-01

    Effective ant control is critical for controlling honeydew-secreting homopteran agricultural pests such as whitefly and mealybug. Low-toxicity ant baits may more effectively control ants than the broad-spectrum insecticides currently used in California vineyards and citrus orchards. This study focused on developing effective ant baits for use in bait stations to control field ant and Argentine ant, which aggressively tend homopteran pests. In the Coachella Valley, field ant is associated with...

  5. Síntesis de una sílicemesoporosa por una ruta alterna a la ruta neutra convencional

    OpenAIRE

    Ligia Sierra G.; Betty Lucy López O.; Humberto Gil G.

    2010-01-01

    Se sintetizó una malla molecular silicato a partir de un surfactante neutro de óxido de polietileno (Tritón X 100) y soluciones de silicato de sodio mediante un mecanismo de síntesis no establecido antes para este tipo de surfactante, en el cual el sodio interviene como agente polimerizante, a la vez que puede actuar como especie mediadora M"*" en la interacción del surfactante con la silica, presentándose en este caso además del mecanismo de formación neutro S°r, un mecanismo de tipo S°M'...

  6. 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.

  7. 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. 

  8. Lithiase géante sur enterocystoplastie

    Science.gov (United States)

    Elmortaji, Khalid; Elomri, Ghassane; Bennani, Saad; Rabii, Redouane; Aboutaib, Rachid; Meziane, Fethi

    2014-01-01

    La formation des lithiases est une complication fréquente des entérocystoplasties après cystectomie radicale pour tumeur de vessie infiltrante. Le délai d'apparition dépend des facteurs de risque favorisants notamment les infections urinaires. Néanmoins la survenue de lithiase géante sur néovessie reste exceptionnelle, seulement 5 cas ont été rapportés dans la littérature. Nous rapportons dans ce travail, le cas d'une lithiase géante compliquant une entérocystoplastie chez un malade suivi pour tumeur de vessie infiltrante. PMID:25932070

  9. Optic disc detection using ant colony optimization

    Science.gov (United States)

    Dias, Marcy A.; Monteiro, Fernando C.

    2012-09-01

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

  10. 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 ...

  11. Some 'ant'swers: Application of a layered barcode approach to problems in ant taxonomy.

    Science.gov (United States)

    Paknia, Omid; Bergmann, Tjard; Hadrys, Heike

    2015-11-01

    DNA barcoding has emerged as a routine tool in modern taxonomy. Although straightforward, this approach faces new challenges, when applied to difficult situation such as defining cryptic biodiversity. Ants are prime examples for high degrees of cryptic biodiversity due to complex population differentiation, hybridization and speciation processes. Here, we test the DNA barcoding region, cytochrome c oxidase 1 and two supplementary markers, 28S ribosomal DNA and long-wavelength rhodopsin, commonly used in ant taxonomy, for their potential in a layered, character-based barcoding approach across different taxonomic levels. Furthermore, we assess performance of the character-based barcoding approach to determine cryptic species diversity in ants. We found (i) that the barcode potential of a specific genetic marker varied widely among taxonomic levels in ants; (ii) that application of a layered, character-based barcode for identification of specimens can be a solution to taxonomical challenging groups; (iii) that the character-based barcoding approach allows us to differentiate specimens even within locations based on pure characters. In summary, (layered) character-based barcoding offers a reliable alternative for problematic species identification in ants and can be used as a fast and cost-efficient approach to estimate presence, absence or frequency of cryptic species. PMID:25712507

  12. 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.

  13. Ants and sustainable agriculture. A review

    OpenAIRE

    Benckiser, Gero

    2010-01-01

    International audience 60% of the world's ecosystems are not used in a sustainable way. Modern agriculture is blamed for declining soil carbon and biodiversity. Climate change, habitat fragmentation and other obstacles impede the movement of many animal species, and distribution changes are projected to continue. Therefore, we need alternative management strategies. The colony organisation of social insects, especially of ants, is seen as a model to design an improved agricultural manageme...

  14. Recruitment Strategies and Colony Size in Ants

    OpenAIRE

    Planqué, Robert; van den Berg, Jan Bouwe; Franks, Nigel R

    2010-01-01

    Ants use a great variety of recruitment methods to forage for food or find new nests, including tandem running, group recruitment and scent trails. It has been known for some time that there is a loose correlation across many taxa between species-specific mature colony size and recruitment method. Very small colonies tend to use solitary foraging; small to medium sized colonies use tandem running or group recruitment whereas larger colonies use pheromone recruitment trails. Until now, explana...

  15. Associations Between Australian Pseudoscorpions and Ants

    OpenAIRE

    Harvey, Mark S.; Mark A. Elgar; Cole, Deborah C.

    1994-01-01

    The distribution of three species of pseudoscorpions, found under the bark of blue gum Eucalyptus globulus, is closely correlated with the presence of three species of ants. Marachernes bellus is never found on trees without Anonychomyrma sp. near foetens, and Protochelifer victorianus and Paraustrochernes victorianus are more commonly found on trees with Technomyrmex jocosus and/or Tapinoma minutum. The distribution of another pseudoscorpion, Conicochernes sp., is not influenced by the prese...

  16. Bus Network Modeling Using Ant Algorithms

    OpenAIRE

    Sepideh Eshragh; Shahriar Afandizadeh Zargari; Ardeshir Faghri; Earl Rusty Lee

    2010-01-01

    Bus transit network modeling is a complex and combinatorial problem. The main purpose of this paper is to apply a contemporary method for designing a bus transit network with the objective of achieving optimum results. The method is called Ant Algorithms, a Meta Heuristic method, which has been applied to optimization problems in transportation with noticeable success. The description of the algorithm, as well as the main methodology and computations, is presented in this paper. Furthermore, ...

  17. Road Traffic System: Optimization Using Ant Systems

    OpenAIRE

    Yeong, Kim Ming

    2003-01-01

    Let us look at these social insects, which are relatively simple however, they can perform effective strategy following the simple, adaptive to local rules, which allows them to change according to the environment for survival. This uniqueness of the insect world helps us to understand that complex situation does have solution. The study of ant colonies behavior is an interesting issue that provides good modeling solution for difficult optimization and distributed control problems. Transporta...

  18. Ant-Man and the quantum realm

    Science.gov (United States)

    Michalakis, Spiros

    2015-11-01

    I was in Los Angeles airport, stuffing French fries into my mouth and waiting for a flight to Charlotte, North Carolina, when my phone buzzed. The e-mail was from the Science and Entertainment Exchange, a non-profit organization working to elevate the level of science in the movies, and it told me to report to Atlanta to consult on a new superhero movie: Ant-Man.

  19. Ant colony optimization and constraint programming

    CERN Document Server

    Solnon, Christine

    2013-01-01

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

  20. Antígenos nativos de Aspergillus fumigatus con utilidad para el inmunodiagnóstico de aspergiloma

    Directory of Open Access Journals (Sweden)

    José Casquero

    2009-04-01

    Full Text Available Con el objetivo de evaluar la utilidad de los antígenos nativos de cepas autóctonas de Aspergillus fumigatus para el inmunodiagnóstico de aspergiloma, se desarrolló un estudio empleando dos cepas de ese hongo, aisladas de pacientes con diagnóstico de aspergiloma (533 y 554, los cuales fueron confrontados con sueros controles comerciales de A. fumigatus, A. flavus, A. niger, Candida, Coccidioides, Histoplasma y Paracoccidioides mediante la prueba de inmunodifusión, asimismo, se evaluaron frente a 28 sueros de pacientes con sospecha de aspergiloma. Además, se realizó la caracterización de los componentes proteicos de los antígenos nativos con la técnica de SDS-PAGE y se confrontaron con diez sueros de pacientes con aspergiloma, paracoccidioidomicosis, histoplasmosis, proteína C reactiva e hidatidosis y suero de persona sana por inmunoblot. Se encontró una buena concordancia (kappa 0,92 entre los antígenos 533 y 554, y algo menor de éstos con el antígeno comercial para A. fumigatus (kappa 0,73 y 0,81 para el 553 y 554; respectivamente. La banda de 97 kDa reaccionó sólo con sueros de pacientes con aspergiloma siendo inmunodominante.

  1. Comparative ultrastructure of ant spermatozoa (Formicidae: Hymenoptera).

    Science.gov (United States)

    Wheeler, D E; Crichton, E G; Krutzsch, P H

    1990-12-01

    Mature spermatozoa from spermathecae of founding queens were obtained from 5 species of ants, representing the major subfamilies Myrmicinae (Acromyrmex versicolor, Crematogaster sp.) and Dolichoderinae (Tapinoma sessile, Conomyrma insana, Conomyrma wheeleri). The ultrastructure of ant spermatozoa has many features in common with that of higher insects and is similar to that of other Hymenoptera. Structural similarities to spermatozoa of other Hymenoptera include an acrosome containing an internal rod that extends into the nucleus, two elongate mitochondrial derivatives, a centriolar adjunct, and an axonemal arrangement of 9 + 9 + 2 that includes well-developed coarse, or accessory, tubules. Spermatozoa obtained from A. versicolor, a species that is known to store and utilize viable sperm from this supply for over 10 years, show greater development of the mitochondrial derivatives than do the other species. The most distinctive feature of ant spermatozoa in comparison to other Hymenoptera is the large size of the centriolar adjunct relative to the other organelles. The centriolar adjunct is located posterior to the nucleus, anterior to the mitochondrial derivatives, and opposite the axoneme. PMID:2280410

  2. Polydomy in the ant Ectatomma opaciventre.

    Science.gov (United States)

    Tofolo, Viviane C; Giannotti, Edilberto; Neves, Erika F; Andrade, Luis H C; Lima, Sandro M; Súarez, Yzel R; Antonialli-Junior, William F

    2014-01-01

    Tropical ants commonly exhibit a hyper-dispersed pattern of spatial distribution of nests. In polydomous species, nests may be satellites, that is, secondary structures of the main nest, where the queen is found. In order to evaluate whether the ant Ectatomma opaciventre Roger (Formicidae: Ectatomminae) uses the strategy of building polydomous nests, the spatial distribution pattern of 33 nests in a 1,800 m(2) degraded area located in Rio Claro, SP, Brazil, were investigated using the nearest neighbor method. To complement the results of this investigation, the cuticular chemical profile of eight colonies was analyzed using Fourier transform infrared photoacoustic spectroscopy (FTIR-PAS). The nests of E. opaciventre presented a hyper-dispersed or regular distribution, which is the most common in ants. The analysis of the cuticular hydrocarbons apparently con-firmed the hypothesis that this species is polydomous, since the chemical profiles of all studied colonies with nests at different sites were very similar to the chemical signature of the single found queen and were also different from those of colonies used as control. PMID:25373168

  3. Polygyny and polyandry in small ant societies.

    Science.gov (United States)

    Kellner, K; Trindl, A; Heinze, J; D'Ettorre, P

    2007-06-01

    Social insects, ants in particular, show considerable variation in queen number and mating frequency resulting in a wide range of social structures. The dynamics of reproductive conflicts in insect societies are directly connected to the colony kin structure, thus, the study of relatedness patterns is essential in order to understand the evolutionary resolution of these conflicts. We studied colony kin structure and mating frequencies in two closely related Neotropical ant species Pachycondyla inversa and Pachycondyla villosa. These represent interesting model systems because queens found new colonies cooperatively but, unlike many other ant species, they may still co-exist when the colony becomes mature (primary polygyny). By using five specific and highly variable microsatellite markers, we show that in both species queens usually mate with two or more males and that cofounding queens are always unrelated. Polygynous and polyandrous colonies are characterized by a high genetic diversity, with a mean relatedness coefficient among worker nestmates of 0.27 (+/- 0.03 SE) for P. inversa and 0.31 (+/- 0.05 SE) for P. villosa. However, relatedness among workers of the same matriline is high (0.60 +/- 0.03 in P. inversa, 0.62 +/- 0.08 in P. villosa) since males that mated with the same queen are on average closely related. Hence, we have found a new taxon in social Hymenoptera with high queen-mating frequencies and with intriguing mating and dispersal patterns of the sexuals. PMID:17561897

  4. Recognition of social identity in ants

    Directory of Open Access Journals (Sweden)

    Nick Bos

    2012-03-01

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

  5. Para una feminista, su principal interlocutora es siempre otra mujer

    OpenAIRE

    Cremona, María Florencia

    2014-01-01

    Rita Segato aborda los desafíos del feminismo en el escenario actual de modernidad avanzada. Ante el diagnóstico de una tendencia hacia una «profesionalización del género», y la consolidación de su estatuto «borderline» respecto de los asuntos de interés público, afirma la necesidad de articular nuevas retóricas insurgentes y excéntricas que sirvan para erosionar el orden patriarcal, pero también etnocéntrico y colonial. Rechaza la categoría despolitizante «crímenes de odio», y señala que, a ...

  6. 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.

  7. Reduced Chitinase Activities in Ant Plants of the Genus Macaranga

    Science.gov (United States)

    Heil, Martin; Fiala, Brigitte; Linsenmair, K. Eduard; Boller, Thomas

    Many plant species have evolved mutualistic associations with ants, protecting their host against detrimental influences such as herbivorous insects. Letourneau (1998) reported in the case of Piper that ants defend their plants principally against stem-boring insects and also reduce fungal infections on inflorescences. Macaranga plants that were experimentally deprived of their symbiotic Crematogaster ants suffered heavily from shoot borers and pathogenic fungi (Heil 1998). Here we report that ants seem to reduce fungal infections actively in the obligate myrmecophyte Macarangatriloba (Euphorbiaceae), while ant-free plants can be easily infected. We also found extremely low chitinase activity in Macaranga plants. The plants' own biochemical defense seems to be reduced, and low chitinase activity perhaps may represent a predisposition for the evolution of myrmecophytism. These plants are therefore highly dependent on their ants, which obviously function not only as an antiherbivore defense but also as an effective agent against fungal pathogens.

  8. Evolution of Fungal enzymes in the attine ant symbiosis

    DEFF Research Database (Denmark)

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

    The attine ant symbiosis is characterized by ancient but varying degrees of diffuse co-evolution between the ants and their fungal cultivars. Domesticated fungi became dependent on vertical transmission by queens and the ant colonies came to rely on their symbiotic fungus for food and thus......, indirectly, on fungal enzymes to break down the plant material brought in by the ants as fungal substrate. The more than 210 extant fungus-growing ant species differ considerably in colony size, social complexity and substrate-use. Only the derived leaf-cutting ants are specialized on using fresh leaves as...... garden substrate, whereas the more basal genera use leaf litter, insect feces and insect carcasses. We hypothesized that enzyme activity of fungal symbionts has co-evolved with substrate use and we measured enzyme activities of fungus gardens in the field to test this, focusing particularly on plant...

  9. Image feature extraction based multiple ant colonies cooperation

    Science.gov (United States)

    Zhang, Zhilong; Yang, Weiping; Li, Jicheng

    2015-05-01

    This paper presents a novel image feature extraction algorithm based on multiple ant colonies cooperation. Firstly, a low resolution version of the input image is created using Gaussian pyramid algorithm, and two ant colonies are spread on the source image and low resolution image respectively. The ant colony on the low resolution image uses phase congruency as its inspiration information, while the ant colony on the source image uses gradient magnitude as its inspiration information. These two ant colonies cooperate to extract salient image features through sharing a same pheromone matrix. After the optimization process, image features are detected based on thresholding the pheromone matrix. Since gradient magnitude and phase congruency of the input image are used as inspiration information of the ant colonies, our algorithm shows higher intelligence and is capable of acquiring more complete and meaningful image features than other simpler edge detectors.

  10. The evolution of social traits and biodiversity in the ants.

    OpenAIRE

    Ferguson-Gow, Henry

    2014-01-01

    Cooperation has shaped the evolution of life on Earth. The ants are the most numerically diverse of the eusocial Hymenoptera, and display wide variation in social complexity. This positions the ants as an ideal taxon in which to study social evolution in a comparative framework. Social evolution theory has generated many hypotheses that are testable in ants, however the lack of comprehensive or complete phylogenies, and the decentralised and scattered nature of trait data, has been an obstacl...

  11. Colony-level impacts of parasitoid flies on fire ants.

    OpenAIRE

    Mehdiabadi, Natasha J; Gilbert, Lawrence E

    2002-01-01

    The red imported fire ant is becoming a global ecological problem, having invaded the United States, Puerto Rico, New Zealand and, most recently, Australia. In its established areas, this pest is devastating natural biodiversity. Early attempts to halt fire ant expansion with pesticides actually enhanced its spread. Phorid fly parasitoids from South America have now been introduced into the United States as potential biological control agents of the red imported fire ant, but the impact of th...

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

    OpenAIRE

    Maria Fernanda Miori de Zarzuela; Luis Garrigós Leite; José Eduardo Marcondes; Ana Eugênia de Carvalho Campos

    2012-01-01

    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 t...

  13. Newly discovered sister lineage sheds light on early ant evolution

    OpenAIRE

    Rabeling, Christian; Brown, Jeremy M.; Verhaagh, Manfred

    2008-01-01

    Ants are the world's most conspicuous and important eusocial insects and their diversity, abundance, and extreme behavioral specializations make them a model system for several disciplines within the biological sciences. Here, we report the discovery of a new ant that appears to represent the sister lineage to all extant ants (Hymenoptera: Formicidae). The phylogenetic position of this cryptic predator from the soils of the Amazon rainforest was inferred from several nuclear genes, sequenced ...

  14. The Molecular Clockwork of the Fire Ant Solenopsis invicta

    OpenAIRE

    Ingram, Krista K.; Alexander Kutowoi; Yannick Wurm; Dewayne Shoemaker; Rudolf Meier; Guy Bloch

    2012-01-01

    The circadian clock is a core molecular mechanism that allows organisms to anticipate daily environmental changes and adapt the timing of behaviors to maximize efficiency. In social insects, the ability to maintain the appropriate temporal order is thought to improve colony efficiency and fitness. We used the newly sequenced fire ant (Solenopsis invicta) genome to characterize the first ant circadian clock. Our results reveal that the fire ant clock is similar to the clock of the honeybee, a ...

  15. 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.

  16. Surface structure helps desert ants return to known feeding sites

    OpenAIRE

    Merkle, Tobias

    2009-01-01

    Desert ants, Cataglyphis fortis, return to their nest when they are disturbed during their foraging trips. Training them to a landmark corridor enabled us to induce ants that were captured immediately after leaving the nest and transferred to an unknown area to start their foraging trips.1 However, most of the ants never traveled the entire foraging distance to the feeder, but aborted their runs after the landmark corridor was no longer visible. Therefore, apart from landmark information and ...

  17. Chaos–order transition in foraging behavior of ants

    OpenAIRE

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

    2014-01-01

    We have studied the foraging behavior of group animals that live in fixed colonies (especially ants) as an important problem in ecology. Building on former findings on deterministic chaotic activities of single ants, we uncovered that the transition from chaotic to periodic regimes results from an optimization scheme of the self-organization of such an animal colony. We found that an effective foraging of ants mainly depends on their nest as well as their physical abilities and knowledge due ...

  18. Protein structure optimization with a "Lamarckian" ant colony algorithm.

    Science.gov (United States)

    Oakley, Mark T; Richardson, E Grace; Carr, Harriet; Johnston, Roy L

    2013-01-01

    We describe the LamarckiAnt algorithm: a search algorithm that combines the features of a "Lamarckian" genetic algorithm and ant colony optimization. We have implemented this algorithm for the optimization of BLN model proteins, which have frustrated energy landscapes and represent a challenge for global optimization algorithms. We demonstrate that LamarckiAnt performs competitively with other state-of-the-art optimization algorithms. PMID:24407312

  19. 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.

  20. Nutritional composition of Polyrhachis vicina Roger (Edible Chinese black ant)

    OpenAIRE

    Yucui Ren; Lirong Shen; Fengqin Feng; Duo Li

    2006-01-01

    Edible black ant (Polyrhachis vicina Roger) is a traditional edible insect species in China. It has been used as a functional ingredient in various tonics or health foods. This study determined the nutritional composition of the black ant, which included minerals, amino acids, superoxide dismutase (SOD), Vitamin E, and total acid. Supercritical CO2 fluid extraction was used to extract the organic compounds. The compounds were identified and quantified by GC-MS. Results showed that the ant pow...

  1. Tuning PID Controller Using Multiobjective Ant Colony Optimization

    OpenAIRE

    Pierre Borne; Noureddine Liouane; Ibtissem Chiha

    2012-01-01

    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 an...

  2. Optimization Planning based on Improved Ant Colony Algorithm for Robot

    OpenAIRE

    Xin Zhang; Zhanwen Wu

    2014-01-01

    As the ant colony algorithm has the defects in robot optimization path planning such as that low convergence cause local optimum, an improved ant colony algorithm is proposed to apply to the planning of path finding for robot. This algorithm uses the search way of exhumation ant to realize the complementation of advantages and accelerate the convergence of algorithm. The experimental result shows that the algorithm of this paper make the optimization planning of robot more reasonable

  3. Improved Ant Colony Clustering Algorithm and Its Performance Study

    OpenAIRE

    Wei Gao

    2015-01-01

    Clustering analysis is used in many disciplines and applications; it is an important tool that descriptively identifies homogeneous groups of objects based on attribute values. The ant colony clustering algorithm is a swarm-intelligent method used for clustering problems that is inspired by the behavior of ant colonies that cluster their corpses and sort their larvae. A new abstraction ant colony clustering algorithm using a data combination mechanism is proposed to improve the computational ...

  4. An Improved Ant Colony Routing Algorithm for WSNs

    OpenAIRE

    Tan Zhi; Zhang Hui

    2015-01-01

    Ant colony algorithm is a classical routing algorithm. And it are used in a variety of application because it is economic and self-organized. However, the routing algorithm will expend huge amounts of energy at the beginning. In the paper, based on the idea of Dijkstra algorithm, the improved ant colony algorithm was proposed to balance the energy consumption of networks. Through simulation and comparison with basic ant colony algorithms, it is obvious that improved algorithm can effectively...

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

    OpenAIRE

    Xianmin Wei

    2013-01-01

    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. ...

  6. 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.

  7. 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

    OpenAIRE

    Medel, P.; A.C. Tamayo; Velázquez, D.; Salinas, J; U. Guevara

    2007-01-01

    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 clín...

  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. La conciencia ecol??gica. El espejo de una civilizaci??n suicida

    OpenAIRE

    S??nchez Yustos, Policarpo

    2009-01-01

    Gracias a la Revoluci??n Industrial podemos estar ante las primeras alteraciones clim??ticas planetarias de origen humano. Los laboratorios cient??ficos constantemente est??n produciendo una valiosa informaci??n y conocimiento sobre el calado real del deterioro ambiental. Sin embargo, las naciones del mundo son m??s lentas en la toma de decisiones. Por su parte, el "ecologismo" est?? fuertemente implicado en la conservaci??n de la biodiversidad del planeta. Incluso, algunos ecologistas han da...

  10. Disseny d'un simulador d'aviònica per a una cabina de DC9/A320 basat en flight simulator

    OpenAIRE

    Font Garcia, Bernat

    2012-01-01

    Aquest projecte tracta sobre el desenvolupament d’un software que permeti enllaçar un simulador de vol i una cabina real de DC9, situada al Institut de la Illa dels Banyols al Prat de Llobregat - Barcelona. Mitjançant una llibreria externa al simulador, s’estableix una comunicació entre aquest i el programa en qüestió. Per una banda s’aconsegueix extreure les dades que es necessiten mostrar en la cabina del DC9 i per l’altra es poden generar certes fallades en el simulador a...

  11. Diez años de vida en línea: la experiencia de editar una revista electrónica en educación

    OpenAIRE

    Graciela Cordero Arroyo; Maricela López Ornelas; Antonieta Kiyoko Nishikawa Aceves; Lewis McAnally Salas

    2009-01-01

    Este artículo es un análisis retrospectivo de una década en la publicación de la Revista Electrónica de Investigación Educativa (REDIE). En primer lugar se describen los retos iniciales que implicó editar en internet una revista de corte académico, ante un público acostumbrado a leer y publicar en revistas impresas. En segundo, se delinea la trayectoria que ha seguido la REDIE para asirse a una postura editorial específica, como publicación emanada de una universidad pública; por ejemp...

  12. Ant plant herbivore interactions in the neotropical cerrado savanna

    Science.gov (United States)

    Oliveira, Paulo S.; Freitas, André V. L.

    2004-12-01

    The Brazilian cerrado savanna covers nearly 2 million km2 and has a high incidence on foliage of various liquid food sources such as extrafloral nectar and insect exudates. These liquid rewards generate intense ant activity on cerrado foliage, making ant plant herbivore interactions especially prevalent in this biome. We present data on the distribution and abundance of extrafloral nectaries in the woody flora of cerrado communities and in the flora of other habitats worldwide, and stress the relevance of liquid food sources (including hemipteran honeydew) for the ant fauna. Consumption by ants of plant and insect exudates significantly affects the activity of the associated herbivores of cerrado plant species, with varying impacts on the reproductive output of the plants. Experiments with an ant plant butterfly system unequivocally demonstrate that the behavior of both immature and adult lepidopterans is closely related to the use of a risky host plant, where intensive visitation by ants can have a severe impact on caterpillar survival. We discuss recent evidence suggesting that the occurrence of liquid rewards on leaves plays a key role in mediating the foraging ecology of foliage-dwelling ants, and that facultative ant plant mutualisms are important in structuring the community of canopy arthropods. Ant-mediated effects on cerrado herbivore communities can be revealed by experiments performed on wide spatial scales, including many environmental factors such as soil fertility and vegetation structure. We also present some research questions that could be rewarding to investigate in this major neotropical savanna.

  13. Chimpanzees prey on army ants with specialized tool set.

    Science.gov (United States)

    Sanz, Crickette M; Schöning, Caspar; Morgan, David B

    2010-01-01

    Several populations of chimpanzees have been reported to prey upon Dorylus army ants. The most common tool-using technique to gather these ants is with "dipping" probes, which vary in length with regard to aggressiveness and lifestyle of the prey species. We report the use of a tool set in army ant predation by chimpanzees in the Goualougo Triangle, Republic of Congo. We recovered 1,060 tools used in this context and collected 25 video recordings of chimpanzee tool-using behavior at ant nests. Two different types of tools were distinguished based on their form and function. The chimpanzees use a woody sapling to perforate the ant nest, and then a herb stem as a dipping tool to harvest the ants. All of the species of ants preyed upon in Goualougo are present and consumed by chimpanzees at other sites, but there are no other reports of such a regular or widespread use of more than one type of tool to prey upon Dorylus ants. Furthermore, this tool set differs from other types of tool combinations used by chimpanzees at this site for preying upon termites or gathering honey. Therefore, we conclude that these chimpanzees have developed a specialized method for preying upon army ants, which involves the use of an additional tool for opening nests. Further research is needed to determine which specific ecological and social factors may have shaped the emergence and maintenance of this technology. PMID:19731231

  14. 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).

  15. 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.

  16. Insecticide transfer efficiency and lethal load in Argentine ants

    Science.gov (United States)

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

    2015-10-01

    Trophallaxis between individual worker ants and the toxicant load in dead and live Argentine ants (Linepithema humile) in colonies exposed to fipronil and hydramethylnon experimental baits were examined using accelerator mass spectrometry (AMS). About 50% of the content of the crop containing trace levels of 14C-sucrose, 14C-hydramethylnon, and 14C-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.

  17. Improved Ant Colony Clustering Algorithm and Its Performance Study.

    Science.gov (United States)

    Gao, Wei

    2016-01-01

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

  18. Una vacuna pel virus de l’Ebola : un repte de desenvolupament i comunicació

    OpenAIRE

    Velasco Muñoz, César; Casajuana, Cristina; Bosque-Prous, Marina

    2015-01-01

    L'Ebola es una malaltia transmissible, greu i sovint mortal. Els epidemiòlegs controlen les epidèmies d'ebola mitjançant mesures d'aïllament i seguiment de contactes. Quan el nombre de contagis és elevat una vacuna pot ser crucial en la disminució de la transmissió. La necessitat de disposar de vacunes enfront del virus de la ebola ha accelerat el desenvolupament experimental i els assajos clínics. En aquest article s'introdueix el virus de la ebola, s'exposen les fases de desenvolupament de ...

  19. Turismo y cambio climático: una actividad vulnerable que debe adaptarse

    OpenAIRE

    Olcina Cantos, Jorge

    2012-01-01

    El turismo es una actividad especialmente expuesta a los efectos del cambio climático. Alguna de las modalidades de turismo (sol y playa, de nieve, de grandes ciudades) presenta una alta vulnerabilidad ante el calentamiento térmico planetario y sus procesos asociados. Aumento de temperaturas y reducción de precipitaciones son los procesos que han tenido preferencia en la transmisión de los efectos del cambio climático en latitudes medias y, con especial incidencia, en el ámbito mediterráneo. ...

  20. Plan de negocio para la creación de una academia de idiomas en Valencia

    OpenAIRE

    ROCA OLMOS, SANDRA

    2014-01-01

    El presente Trabajo Final de Carrera consiste en la elaboración de un Plan de Negocio para la creación y posterior puesta en marcha de una academia de idiomas en la ciudad de Valencia. La mejor opción antes de emprender cualquier proyecto empresarial es realizar este tipo de estudio para analizar, por una parte, todos los aspectos relacionados con este nuevo desafío, así como, para organizar todas las actividades que van a ser necesarias para poder llevarlo a cabo. Finalmente, servirá tamb...

  1. 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...

  2. Alfabetizacion digital en el adulto maduro una estrategia para la inclusión social

    OpenAIRE

    Paz, Luis Eduardo

    2010-01-01

    La aparición del computador y todas las herramienta tecnológicas le dieron al ser humano una serie de habilidades y competencias tecnológicas que nunca antes había tenido; sin embargo estas competencias solo fueron accesibles a una generación determinada, es decir las personas que en su paso por las instituciones educativas, o por requerimientos laborales se vieron directamente implicados con este nuevo modelo. La diferencia generacional existente en el uso de la tecnología en general y ...

  3. "socialismo del siglo xxi” o viejo centrismo estatal? una lectura disidente de las transformaciones en venezuela

    OpenAIRE

    Zelik, Raúl

    2012-01-01

    Las transformaciones políticas en Venezuela polarizan los debates, no sólo en Colombia. Lo que para unos es una dictadura comunista, para otros representa una esperanza de democratización y justicia social. En realidad, un análisis serio de la ‘Revolución Bolivariana’ muestra un panorama mucho más complejo y contradictorio. Por un lado, hay importantes avances en la política social: con la recuperación de los ingresos petroleros —que antes no salieron de la empresa estatal PDVSA— el Gobierno ...

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

    OpenAIRE

    Quiñenao, Carlos

    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...

  5. El registro de marcas como plataforma para el crecimiento de una empresa

    OpenAIRE

    Karina Trejo Sánchez; Carlos Adolfo Sanabria Valdés

    2011-01-01

    La marca constituye y constituirá una punta de lanza para el despegue económico de los comerciantes y las sociedades mercantiles. En medio de la Globalización o Mundialización, nuestro país tiene que buscar mayores espacios para comercializar bienes o servicios con países extranjeros. La marca, para una persona física o moral mexicana, puede ser la carta de presentación ante empresas extranjeras para realizar negocios.

  6. FInDroidMe : desenvolupament d'una aplicació per Android

    OpenAIRE

    Filella Garcia, Javi

    2011-01-01

    Elaboració d'una senzilla aplicació client-servidor de localització geogràfica mitjançant el GPS integrat d'un Smartphone amb Sistema Operatiu Android Elaboración de una sencilla aplicación cliente-servidor de localización geográfica mediante el GPS integrado de un Smartphone con sistema operativo Android Development a simple client-server application of geographic location using GPS integrated with an operating system Android Smartphone

  7. Una aproximación a la virtualidad educativa de los videojuegos

    OpenAIRE

    Sádaba, Ch. (Charo); C. Naval

    2008-01-01

    ¿Es posible que una plataforma que exige la continua participación del usuario pueda afectar a su actitud ante la participación entendida de un modo más amplio? ¿Se pueden adquirir actitudes y habilidades sociales y participativas a través de los videojuegos? Ninguna de estas preguntas tiene una respuesta sencilla; a lo largo de este artículo se plantean y discuten varios puntos de reflexión que tratan de darles respuesta en el marco de la concreta realidad que rodea a los adol...

  8. Miedo y valor: una terapia naturalista del miedo a la muerte

    OpenAIRE

    Hoyos S??nchez, Inmaculada

    2007-01-01

    El objetivo de este art??culo es realizar una genealog??a de esa pasi??n que es el miedo a la muerte en el sentido de determinar si ??sta conviene o no a nuestra naturaleza. Para ello se analizan el argumento epic??reo que Lucrecio esgrime para demostrar que es irracional temer la muerte, la cr??tica que del mismo hace M.C. Nussbaum y a partir de la cual desarrolla una terapia coherentemente naturalista de esa pasi??n, y, ya en la segunda parte, el ant??doto contra el miedo que Spinoza elabor...

  9. Expresión recombinante en E. Coli de antígenos de Actinobacillus Pleuropneumoniae para vacunación y diagnóstico

    OpenAIRE

    Medrano Muñoz, Andrés

    2003-01-01

    Actinobacillus pleuropneumoniae es una bacteria gramnegativa que provoca la pleuroneumonía porcina. En este trabajo se ha procedido a la producción y purificación, mediante técnicas de biología molecular, de antígenos proteicos de esta bacteria y a su uso en la formulación de una vacuna por subunidades y de un ELISA para diagnóstico. Los cuatro antígenos escogidos fueron dos proteínas de membrana externa (Tbp1 y Tbp2) y dos exotoxinas (ApxI y ApxIII). La primera necesidad consistía en localiz...

  10. Nectar theft and floral ant-repellence: a link between nectar volume and ant-repellent traits?

    Directory of Open Access Journals (Sweden)

    Gavin Ballantyne

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

  11. Kokori, un Serious Game. La perspectiva de los estudiantes ante una propuesta de aprendizaje innovadora.

    OpenAIRE

    Bossolasco, María Luisa; Enrico, Roxana Judith; Casanova, Beatríz Adriana; Enrico, Eugenia Elizabeth

    2015-01-01

    This article shows the results of a learning experience which was proposed to the students to participate in a video game, considering this game as another activity in their learning process. The purpose of the study was to investigate the reasons why students chose to play / not to play as well as their beliefs about the feasibility of including such proposals in education and its potential benefits for learning. The analysis of the results was performed by focusing on motivational processes...

  12. 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

  13. 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

  14. 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.

  15. Enhanced ant colony optimization for multiscale problems

    Science.gov (United States)

    Hu, Nan; Fish, Jacob

    2016-03-01

    The present manuscript addresses the issue of computational complexity of optimizing nonlinear composite materials and structures at multiple scales. Several solutions are detailed to meet the enormous computational challenge of optimizing nonlinear structures at multiple scales including: (i) enhanced sampling procedure that provides superior performance of the well-known ant colony optimization algorithm, (ii) a mapping-based meshing of a representative volume element that unlike unstructured meshing permits sensitivity analysis on coarse meshes, and (iii) a multilevel optimization procedure that takes advantage of possible weak coupling of certain scales. We demonstrate the proposed optimization procedure on elastic and inelastic laminated plates involving three scales.

  16. Sexual selection in the ant Leptothorax gredleri

    OpenAIRE

    Oppelt, Angelika

    2010-01-01

    L. gredleri is an ant species that is mating by female calling. Virgin queens attract males with a droplet of a sexual pheromone in the vicinity of their maternal nest. Both sexes are expected to be choosy because females store the semen in their spermatheca throughout their whole lives and do not remate after this initial mating period. Males are short-lived and survive only as sperm in the spermathecae of queens. Furthermore, males possess only a fixed amount of sperm, since their testes de...

  17. 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.

  18. Una sombra que sobrevive

    OpenAIRE

    Alexander Cifuentes

    2014-01-01

    Alma en boca y huesos en costal. Una aproximación a los contrastes socio-económicos de la esclavitud. Santafé, Mariquita y Mompox 1610-1660. Carlos Eduardo Valencia Villa, Instituto Colombiano de Antropología e Historia, colección Cuadernos Coloniales, Bogotá, 2003, 215 págs, ilustrado.

  19. Hacia una agricultura multifuncional

    OpenAIRE

    Gutiérrez San José, Pablo; Valero Ubierna, Constantino

    2008-01-01

    Es interesante ubicar las conquistas tecnológicas de estos últimos 20 años dentro de su contexto histórico y social. Resulta curioso que, para algunos la globalización tuviera como hito de inicio la caída del muro de Berlín en el año 1989 hace casi 20 años. Poco tiempo antes, 22 años, España había entrado en un nuevo entorno como el de la Unión Europea. Podemos ver como nuestro medio agrícola a lo largo de estos últimos 20 años se ha encontrado con un mercado más abierto, en libre competencia...

  20. Review and Phylogenetic Evaluation of Associations between Microdontinae (Diptera: Syrphidae) and Ants (Hymenoptera: Formicidae)

    OpenAIRE

    Menno Reemer

    2013-01-01

    The immature stages of hoverflies of the subfamily Microdontinae (Diptera: Syrphidae) develop in ant nests, as predators of the ant brood. The present paper reviews published and unpublished records of associations of Microdontinae with ants, in order to discuss the following questions. (1) Are all Microdontinae associated with ants? (2) Are Microdontinae associated with all ants? (3) Are particular clades of Microdontinae associated with particular clades of ants? (4) Are Microdontinae assoc...

  1. UNA EXPERIENCIA EN CUBA

    Directory of Open Access Journals (Sweden)

    Lucy Martin

    2003-01-01

    Full Text Available Este artículo examina, desde una perspectiva so- cial, las experiencias de trabajo que un equipo multidisciplinario del INCA lleva a cabo en tres cooperativas de producción agropecuaria (CPA del sur de La Habana y en una cooperati- va de créditos y servicios (CCS de La Palma, Pinar del Río, con el objetivo de encontrar vías complementarias del fitomejoramiento formal por la vía participativa, se pretende destacar cómo en una experiencia de fitomejoramiento con la participación de los productores, se va operando una movili- zación de cambio no solo técnico sino también social, pero que a su vez reclama, para su éxito, de un movimiento en dos direcciones: participación y descentralización. Importantes lec- turas de esta experiencia son, en primer lugar, la posibilidad de construcción de conocimiento nuevo rompiendo mitos, a tra- vés de un diálogo de saberes y con la participación de los productores al tiempo que se producen cambios no solo de alcance técnico, en el ámbito de las semillas y las variedades, sino también de carácter social. En segundo lugar, revela las posibilidades de una experiencia de esta naturaleza, como ver- tiente del desarrollo sostenible y como vía de reconstrucción desde la base de nuestro proyecto social, al posibilitar el forta- lecimiento de los productores y la articulación entre actores sociales protagónicos en el sistema de semilla y en la vida comunitaria en torno a intereses comunes.

  2. Evaluación de antígenos y antisueros para su utilización en el serodiagnóstico de aspergilosis

    OpenAIRE

    Carlos M. Fernandez Andreu; FERNANDO TRAVIESO RUIZ; GERARDO MARTINEZ MACHIN; MAYDA PERURENA LANCHA

    1995-01-01

    La aspergilosis se ha convertido en los últimos años en una importante micosis oportunista, con una gran variedad de manifesta ciones clínicas. Como forma de contribuir al completamiento del diagnóstico serológico de esta micosis, fueron preparados los reactivos biológicos (antígenos y antisueros) a partir de cepas de las especies Aspergillus niger, Aspergillus flavus y Aspergillus terreus con vistas a su utilización en pruebas de inmunoprecipitación. Los reactivos fueron evaluados por inmuno...

  3. La Unión Europea ante la crisis Siria: limitaciones e incoherencias de la acción exterior europea en el mediterráneo

    OpenAIRE

    Ferrer Lloret, Jaume

    2014-01-01

    Hasta el estallido de la denominada “primavera árabe” en los primeros meses de 2011, la Unión europea había mantenido una política exterior condescendiente ante las vulneraciones graves y masivas de los derechos humanos responsabilidad del régimen sirio dirigido por el clan de los Al-Assad. Como respuesta al conflicto armado sirio y la comisión de crímenes contra la humanidad y crímenes de guerra atribuibles al Gobierno sirio, la UE ha aplicado toda una batería de medidas restrictivas, y ha d...

  4. Aplicació de l'IoT mitjançant l'estudi i aplicació de plataformes de mercat

    OpenAIRE

    Comellas Cabeza, Joan

    2015-01-01

    Muntatge d'una aplicació real totalment funcional, per a la seguretat alimentària, mitjançant el control de temperatures en establiments d'emmagatzematge i/o manipulació d'aliments, utilitzant la tecnologia software i hardware actuals del mercat, de l'àmbit de l'internet de les coses. Montaje de una aplicación real totalmente funcional, para la seguridad alimentaria, mediante el control de temperaturas en establecimientos de almacenamiento y/o manipulación de alimentos, utilizando la tecno...

  5. Pequeno livro de Desmatemática, de Manuel António Pina: inventiva estética y competencia literaria

    Directory of Open Access Journals (Sweden)

    Reis da Silva, S.

    2006-11-01

    Full Text Available En este artículo se presenta una reflexión acercadel concepto de competencia literaria y de lasimplicaciones que el texto literario de receptorexplícitamente infantil tiene en su formación.Recurriendo al análisis de la obra Pequeno Livro deDesmatemática, de Manuel António Pina, una de lasvoces más originales del actual panorama literarioportugués, se muestran como modelos algunosejemplos de estrategias técnico-discursivas profundamenteinnovadoras y potencialmente beneficiosaspara la competencia literaria.

  6. Incremento de la vulnerabilidad ante los peligros naturales en España: políticas de reducción del riesgo

    OpenAIRE

    Olcina Cantos, Jorge

    2012-01-01

    España es un territorio de riesgo. La acción conjunta de una peligrosidad elevada ante diferentes episodios naturales de rango extraordinario y de una alta ocupación del territorio (actividades económicas, viviendas, infraestructuras), lo convierte en uno de los territorios europeos con alto nivel de riesgo, especialmente en alguna de sus regiones (litoral mediterráneo, Canarias). La modelización climática señala que en latitudes mediterráneas puede producirse en las próximas décadas un incre...

  7. Diseño de una red telemática para dar acceso a internet mediante redes WiMAX/Wi-Fi

    OpenAIRE

    González Martínez, Juan

    2012-01-01

    Diseño de una red mediante tecnología WiMAX y Wi-Fi para dar acceso a Internet en la localidad de Mocejón (Toledo). Disseny d'una xarxa mitjançant tecnologia WiMAX i Wi-Fi per donar accés a Internet a la localitat de Mocejón (Toledo). Bachelor thesis for the Telecommunication Technologies program on Telematics.

  8. What is important for ant assemblages in temperate forest soils?

    Directory of Open Access Journals (Sweden)

    Tae-Sung Kwon

    2016-06-01

    Full Text Available Ant assemblages in the soil have been studied at eight forest sites (4 oak forest sites, and 4 pine forest sites in four study areas (1 seminatural area, and 3 industrialized areas in South Korea for 6 years from 2002 to 2010. Soil cores and Tullgren funnel were used for the ant survey. Ant surveys were carried out once per year in autumn (from late September to mid-October. The soil pH was lower in the industrialized than in the seminatural area, showing the acidified soils in the industrialized areas. However, the soil acidification did not influence the ant assemblages. The results from the nonmetric multidimensional scaling ordination and from the community temperature index values indicate that temperature is a key determinant for structures of the soil ant assemblages. The ant assemblages were not different according to the forest types (oak forests vs. pine forests. Occurrence of ant species varied greatly among years, indicating that more replicates and advanced sampling method are needed for the monitoring of the soil ant assemblages.

  9. Diversity of peptide toxins from stinging ant venoms.

    Science.gov (United States)

    Aili, Samira R; Touchard, Axel; Escoubas, Pierre; Padula, Matthew P; Orivel, Jérôme; Dejean, Alain; Nicholson, Graham M

    2014-12-15

    Ants (Hymenoptera: Formicidae) represent a taxonomically diverse group of arthropods comprising nearly 13,000 extant species. Sixteen ant subfamilies have individuals that possess a stinger and use their venom for purposes such as a defence against predators, competitors and microbial pathogens, for predation, as well as for social communication. They exhibit a range of activities including antimicrobial, haemolytic, cytolytic, paralytic, insecticidal and pain-producing pharmacologies. While ant venoms are known to be rich in alkaloids and hydrocarbons, ant venoms rich in peptides are becoming more common, yet remain understudied. Recent advances in mass spectrometry techniques have begun to reveal the true complexity of ant venom peptide composition. In the few venoms explored thus far, most peptide toxins appear to occur as small polycationic linear toxins, with antibacterial properties and insecticidal activity. Unlike other venomous animals, a number of ant venoms also contain a range of homodimeric and heterodimeric peptides with one or two interchain disulfide bonds possessing pore-forming, allergenic and paralytic actions. However, ant venoms seem to have only a small number of monomeric disulfide-linked peptides. The present review details the structure and pharmacology of known ant venom peptide toxins and their potential as a source of novel bioinsecticides and therapeutic agents. PMID:25448389

  10. Disease dynamics in a specialized parasite of ant societies

    DEFF Research Database (Denmark)

    Andersen, Sandra Breum; Ferrari, Matthew; Evans, Harry C.; Elliot, Simon L.; Boomsma, Jacobus Jan; Hughes, David P.

    2012-01-01

    Coevolution between ant colonies and their rare specialized parasites are intriguing, because lethal infections of workers may correspond to tolerable chronic diseases of colonies, but the parasite adaptations that allow stable coexistence with ants are virtually unknown. We explore the trade...

  11. 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.

  12. Pre-adaptive cadmium tolerance in the black garden ant.

    Science.gov (United States)

    Grześ, Irena M; Okrutniak, Mateusz

    2016-04-01

    The black garden ant Lasius niger is a common component of habitats subjected to anthropological stress. The species can develop very abundant populations in metal-polluted areas. In this study, we raised the question of its tolerance to Cd pollution. Workers of L. niger were collected from 54 colonies, originating from 19 sites located along an increasing gradient of Cd pollution in Poland. Ants were exposed to a range of dietary Cd concentrations in a controlled 14-day laboratory experiment in order to test Cd-sensitivity in the investigated ants. The level of ant mortality was recorded as the endpoint of the experiment. We used much higher concentrations of dietary Cd than those the ants are most likely exposed to in field conditions. The investigated ants were highly Cd-tolerant; even a very high dietary Cd concentration of approx. 1300 mg/kg did not affect mortality of workers when compared to the control. Mortality was unrelated to Cd-pollution along the pollution gradient, meaning that high Cd-tolerance can be found even in ants from unpolluted areas. The results stress the importance of pre-adaptive mechanisms in the development of metal tolerance in ants. PMID:26820778

  13. 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. PMID:24912159

  14. Commercial agrochemical applications in vineyards do not influence ant communities.

    Science.gov (United States)

    Chong, Chee Seng; Hoffmann, Ary A; Thomson, Linda J

    2007-12-01

    Ants have been widely used as bioindicators for various terrestrial monitoring and assessment programs but are seldom considered in evaluation of nontarget pesticide effect. Much chemical assessment has been biased toward laboratory and bioassay testing for control of specific pest ant species. Several field studies that did explore the nontarget impacts of pesticides on ants have reported contradictory findings. To address the impact of chemical applications on ants, we tested the response of epigeal ant assemblages and community structure to three pesticide gradients (cumulative International Organization for Biological and Integrated Control toxicity rating, chlorpyrifos use rate, and sulfur use rate) in 19 vineyards. Ordination analyses using nonmetric multidimensional scaling detected community structures at species and genus levels, but the structures were not explained by any pesticide variables. There was no consistent pattern in species and genus percentage complementarities and ant assemblages along pesticide gradients. In contrast, ant community structure was influenced by the presence of shelterbelts near the sampling area. Reasons for the resilience of ants to pesticides are given and assessment at the colony level instead of workers abundance is suggested. The presence of Linepithema humile (Mayr) is emphasized. PMID:18284765

  15. The infrabuccal pellet piles of fungus-growing ants.

    Science.gov (United States)

    Little, Ainslie E F; Murakami, Takahiro; Mueller, Ulrich G; Currie, Cameron R

    2003-12-01

    Fungus-growing ants (Attini) live in an obligate mutualism with the fungi they cultivate for food. Because of the obligate nature of this relationship, the success of the ants is directly dependent on their ability to grow healthy fungus gardens. Attine ants have evolved complex disease management strategies to reduce their garden's exposure to potential parasitic microbes, to prevent the establishment of infection in their gardens, and to remove infected garden sections. The infrabuccal pocket, a filtering device located in the oral cavity of all ants, is an integral part of the mechanisms that leaf-cutter ants use to prevent the invasion and spread of general microbial parasites and the specific fungal-garden parasite Escovopsis. Fungus-growing ants carefully groom their garden, collecting general debris and pathogenic spores of Escovopsis in their infrabuccal pocket, the contents of which are later expelled in dump chambers inside the nest or externally. In this study we examined how a phylogenetically diverse collection of attine ants treat their infrabuccal pellets. Unlike leaf-cutters that deposit their infrabuccal pellets directly in refuse piles, ants of the more basal attine lineages stack their infrabuccal pellets in piles located close to their gardens, and a separate caste of workers is devoted to the construction, management, and eventual disposal of these piles. PMID:14676952

  16. The genome of the fire ant Solenopsis invicta

    Science.gov (United States)

    Ants have evolved very complex societies and are key ecosystem members. Some of them are also major pests, as exemplified by the fire ant Solenopsis invicta. We present here the draft genome of S. invicta, assembled from 454 and Illumina reads obtained from a focal haploid male and his brothers. In ...

  17. Life-Histories of Sub-Arctic Ants

    OpenAIRE

    Heinze, Jürgen

    1993-01-01

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

  18. ANT tuner retrofit for LEB cavity

    International Nuclear Information System (INIS)

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

  19. Loading pattern optimization using ant colony algorithm

    Energy Technology Data Exchange (ETDEWEB)

    Hoareau, Fabrice [EDF R and D, Clamart (France)

    2008-07-01

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

  20. Loading pattern optimization using ant colony algorithm

    International Nuclear Information System (INIS)

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

  1. 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.

  2. 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.

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

    DEFF Research Database (Denmark)

    Poulsen, Michael; Sapountzis, Panagiotis

    2012-01-01

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

  4. 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.

  5. 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 ...

  6. Improved ant algorithms for software testing cases generation.

    Science.gov (United States)

    Yang, Shunkun; Man, Tianlong; Xu, Jiaqi

    2014-01-01

    Existing ant colony optimization (ACO) for software testing cases generation is a very popular domain in software testing engineering. However, the traditional ACO has flaws, as early search pheromone is relatively scarce, search efficiency is low, search model is too simple, positive feedback mechanism is easy to produce the phenomenon of stagnation and precocity. This paper introduces improved ACO for software testing cases generation: improved local pheromone update strategy for ant colony optimization, improved pheromone volatilization coefficient for ant colony optimization (IPVACO), and improved the global path pheromone update strategy for ant colony optimization (IGPACO). At last, we put forward a comprehensive improved ant colony optimization (ACIACO), which is based on all the above three methods. The proposed technique will be compared with random algorithm (RND) and genetic algorithm (GA) in terms of both efficiency and coverage. The results indicate that the improved method can effectively improve the search efficiency, restrain precocity, promote case coverage, and reduce the number of iterations. PMID:24883391

  7. Dynamic Task Scheduling Algorithm based on Ant Colony Scheme

    Directory of Open Access Journals (Sweden)

    Kamolov Nizomiddin Baxodirjonovich

    2015-08-01

    Full Text Available Many scientific applications running in Cloud Computing system are workflow applications that contains large number of tasks and in which tasks are connected by precedence relations. Efficient scheduling the workflow tasks become a challenging issue in Cloud Computing environments because the scheduling decides performance of the applications. Unfortunately, finding the optimal scheduling is known as NP-hard. Ant Colony Optimization algorithm can be applied to design efficient scheduling algorithms. Previous scheduling algorithms that use Ant Colony mechanism lack rapid adaptivity. This paper proposes a task scheduling algorithm that uses a modified Ant Colony Optimization. The modified version uses probability in order for ants to decide target machine. The proposed task scheduling algorithm is implemented in WorkflowSim in order to measure performance. The experimental results show that the proposed scheduling algorithm reduce average makespan to about 6.4% compared to a scheduling algorithm that uses basic Ant Colony Optimization scheme.

  8. 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...

  9. Ecological consequences of traffic organisation in ant societies

    Science.gov (United States)

    Burd, Martin

    2006-12-01

    Many species of ants engage in social foraging in which traffic develops over pathways defined by pheromones or physical roads cleared through debris. Worker ants from the same colony have a common underlying evolutionary interest in their collective performance. Thus, ant traffic makes an interesting comparison to other kinds of cellular or organismal traffic composed of elements with varying degrees of shared or disparate goals. Recent studies have revealed how small-scale interactions among ants amplify to create large-scale traffic structure, such as segregation of counterflows. However, much less is known about the ecological costs and benefits of different kinds of traffic organization. The common assumption that maximum traffic flux provides maximum ecological benefit needs closer scrutiny. Ant traffic provides a potentially useful model system for experimental study of crowd panics, and for assessing the role of transport networks in creating scaling relationships between the size and activity rates of the entities they serve.

  10. 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...

  11. Cuidado en los pies diabéticos antes y después de intervención educativa

    OpenAIRE

    Pérez Rodríguez, Mª del Carmen; de Godoy, Simone; Mazzo, Alessandra; Nogueira, Paula Cristina; Trevizan, Mª Auxiliadora; Mendes Costa, Isabel Amélia

    2013-01-01

    El conocimiento sobre cuidados con los pies entre individuos con diabetes mellitus (DM) contribuye para evitar futuras complicaciones. Un estudio casi experimental fue llevado a cabo en los centros de salud de la ciudad de San Luís Potosí, México, con objeto de describir el perfil sociodemográfico y clínico de pacientes con DM y sus hábitos de cuidados con los pies antes y después de una intervención educativa, basada en la comunicación participativa y tradicional. El estudio fue desarrollado...

  12. Jóvenes y violencia: ante las clasificaciones mediáticas de los demás

    OpenAIRE

    Saintout, Florencia

    2009-01-01

    Ante una clasificación hegemónica de la relación juventud/ violencia (reproducida y producida mediáticamente) este artículo se detiene a pensar qué significa la llamada violencia con relación a las peleas protagonizadas por jóvenes, recorriendo la pregunta en torno a las posibles racionalidades que hay en estas prácticas en las que se pone en peligro la integridad física, e incluso en ocasiones la vida. Qué racionalidades, qué sentidos hay en juego al margen del aparente sinsentido estigmatiz...

  13. Escuela y minorías. Inmigrantes y gitanos ante el modelo educativo español

    OpenAIRE

    Garreta i Bochaca, Jordi

    1998-01-01

    Entre los grupos anteriores existe un elevado interés por la conservación de la cultura propia y la tradición. Cada uno adopta diferentes estrategias, ante una sociedad que no siente como propia, según los objetivos que tiene para sus hijos. De esta forma encontramos desde a los que no tienen ningún interés por convivir escolarmente con otras culturas, segregacionistas, a aquellos que quieren mantener la tradición y la cultura con los mínimos cambios posibles y que, a la vez, no creen que deb...

  14. La vulnerabilidad e invisibilidad de las mujeres ante el VIH/SIDA: constantes y cambios en el tema

    OpenAIRE

    Herrera Cristina; Campero Lourdes

    2002-01-01

    Este artículo es una reflexión sobre la problemática que viven las mujeres ante el VIH/SIDA. A través de estadísticas mundiales y nacionales que dan cuenta del incremento de la epidemia en las mujeres, se hace evidente la necesidad de atender el problema. Se argumenta cómo la estructura y relaciones de género favorecen la vulnerabilidad de las mujeres, y cómo la vulnerabilidad y el riesgo de infección se incrementan para muchas mujeres al transitar por diversas situaciones específicas, como l...

  15. Nuevos nanosistemas a base de protamina para la liberación de antígenos

    OpenAIRE

    González Aramundiz, José Vicente

    2014-01-01

    En la presente tesis doctoral se plantea el diseño, desarrollo y optimización de sistemas coloidales nanométricos a base de protamina para la vehiculización y liberación de antígenos. En particular los sistemas desarrollados se dividen en (i) nanopartículas, sistema de tipo matricial que se compone de un polisacárido como ácido hialurónico o alginato entrecruzado con protamina y (ii) nanocápsulas, constituidas por un núcleo liquido oleoso (Miglyol®, escualeno o α tocoferol) y una cubierta de ...

  16. Evaluación de la respuesta de anticuerpos hacia antígenos de Pseudomonas aeruginosa.

    OpenAIRE

    Aniel Moya; Adriana Callicó; Bárbara Cedré; Frank Camacho; Alexei Simón; Juan Almenares; Tania Valmaseda; Alina Ocanto; Armando Cádiz; Sara C. Esnard

    2007-01-01

    Pseudomonas aeruginosa es un patógeno extracelular que genera una respuesta de anticuerpos específicos con utilidad para el diagnóstico y vacunas. En el presente estudio nos propusimos evaluar en suero humano los niveles de anticuerpos contra antígenos relevantes de P. aeruginosa. Realizamos la determinación de anticuerpos IgG contra tres exoenzimas, consideradas como factores de virulencia de mayor importancia en infecciones. Este resultado dio paso a la evaluación del reconocimiento de IgG ...

  17. 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...

  18. Testing baits to control Argentine ants (Hymenoptera: Formicidae) in vineyards.

    Science.gov (United States)

    Daane, Kent M; Cooper, Monica L; Sime, Karen R; Nelson, Erik H; Battany, Mark C; Rust, Michael K

    2008-06-01

    Liquid baits were evaluated for control of the Argentine ant, Linepithema humile (Mayr) (Hymenoptera: Formicidae), and associated mealybug and soft scale pests in California vineyards. In 2003, liquid baits with small doses ofimidacloprid, boric acid, or thiamethoxam dissolved in 25% sucrose water resulted in lower ant and mealybug densities and fruit damage, compared with an untreated control. Similar treatments in a soft scale-infested vineyard showed only a reduction of ant density and fruit infestation in only the boric acid and thiamethoxam treatments. In 2004, commercial and noncommercial formulations of liquid baits reduced ant densities in three separate trials, but they had inconsistent effects on mealybug densities and fruit infestation; granular protein bait had no effect. Using large plots and commercial application methodologies, liquid bait deployed in June resulted in lower ant density and fruit infestation, but it had no effect on mealybug density. Across all trials, liquid bait treatments resulted in lower ant density (12 of 14 trials) and fruit damage (11 of 14 sites), presenting the first report of liquid baits applied using commercial methodologies that resulted in a reduction of ants and their associated hemipteran crop damage. For commercialization of liquid baits, we showed that any of the tested insecticides can suppress Argentine ants when properly delivered in the crop system. For imidacloprid, bait dispensers must be protected from sunlight to reduce photodegradation. Results suggest that incomplete ant suppression can suppress mealybug densities. However, after ant populations are suppressed, there may be a longer period before hemipteran populations are effectively suppressed. Therefore, liquid baits should be considered part of a multiseason program rather than a direct, in-season control of hemipteran pest populations. PMID:18613568

  19. Medición de la emisión biofotónica antes y después de la intervención osteopática en pacientes con lumbalgia mecánica

    OpenAIRE

    Prieto Murillo, Enior Fernando

    2012-01-01

    Se midieron las emisiones biofotónicas de las proyecciones en piel de las apófisis espinosas de la cuarta y quinta vértebras lumbares y de la primera vértebra sacra de veintiún pacientes voluntarios con lumbalgia mecánica, antes y después de una sesión osteopática. Las mediciones se realizaron en un cuarto oscuro, con un tubo fotomultiplicador tipo Photon Counting Head H9319 – 02 (Hamamatsu, Japón) dentro de una caja negra, con una superficie circular efectiva de medida de 25 milímetros de...

  20. Estrategias orientadoras ante la inequidad psicosocial

    OpenAIRE

    Gavilán de Labourdette, Mirta Graciela; Quiles, Cristina Haydée; Chá, Rita Teresita

    2009-01-01

    El presente artículo corresponde a una primera etapa del proyecto de investigación denominado: Investigación evaluativa sobre estrategias de orientación vocacional integral para contribuir a revertir la inequidad psicosocial, que se está llevando a cabo en la actualidad. Se hará una síntesis de las primeras estrategias metodológicas, que incluyen la modalidad de investigación-acción. En esta primera etapa, se analizan los primeros resultados de: a) Los talleres de Información Orientada, y b) ...

  1. Trichinellosis una zoonosis vigente

    Directory of Open Access Journals (Sweden)

    Elsa Gabriela Chávez Guajardo

    2006-06-01

    Full Text Available .- En la presente revisión presentamos una panorámica de la Trichinellosis enfermedad parasitaria cosmopolita y de distribución mundial que afecta prácticamente a todos los mamíferos que su gravedad depende de la carga parasitaria, pero en sus huéspedes aunque no les cause la muerte si disminuye su calidad de vida que desafortunadamente, sigue siendo vigente en este nuevo siglo XXI.

  2. una sociedad emergente

    Directory of Open Access Journals (Sweden)

    Derlisiret Rincón M.

    2006-01-01

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

  3. una experiencia no formal

    Directory of Open Access Journals (Sweden)

    Peter J. Scott

    2008-01-01

    Full Text Available En este documento presentamos parte de un estudio en el que se ha analizado un proceso de aprendizaje desarrollado por estudiantes en interacción directa a través de un entorno de videoconferencia. El estudio cubre un periodo de 6 meses de interacción de un grupo de estudiantes de animación gráfica en diferentes países, quienes han llevado a cabo un total de 99 reuniones. Cada una de estas reuniones ha sido organizada y manejada por la propia comunidad de estudiantes. Al final, los integrantes de la comunidad aparecen como sus propios mentores naturales, y el grupo muestra una enorme capacidad de apoyo mutuo y de asunción de roles de facilitación mutua en el contexto de dicho intercambio. En este estudio podemos ver cómo los estudiantes pueden apoyarse mutuamente de manera eficiente en un contexto de colaboración no formal y además podemos observar cómo sistemas de videoconferencia en red pueden ayudar a facilitar y transformar una comunidad de aprendizaje, incluso sin la intervención formal de aulas o profesores.

  4. Hacia una vejez útil

    Directory of Open Access Journals (Sweden)

    Hernández Amparo

    1992-12-01

    Full Text Available

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

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

    DEFF Research Database (Denmark)

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

    2011-01-01

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

  6. ANT International chemistry update and best practices

    International Nuclear Information System (INIS)

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

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

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    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.

  8. Chimpanzees detect ant-inhabited dead branches and stems: a study of the utilization of plant-ant relationships in the Mahale Mountains, Tanzania.

    Science.gov (United States)

    Fuse, Mieko

    2013-10-01

    Chimpanzees in the Mahale Mountains of Tanzania consume several species of stem- and branch-inhabiting ants throughout the year, without tools. Those ants are cryptic species, and it was unknown how to find them constantly. There has been little research on how the chimpanzees locate these ants. In this study, I use behavioral observations of the chimpanzee predators and surveys of the ant fauna and plants across different habitats to test the hypothesis that chimpanzees use plant species as a cue to efficiently locate ant colonies in litter units (dead parts of the plant). Ants were found to be associated with live plants and with spaces within litter units which provide nesting places. Such ant-plant litter relationships were not necessarily as strong as the mutualism often observed between live plants and ants. The proportion of available litter units inhabited by ants was 20 %, and litter units of three plant species (Vernonia subligera, Dracaena usambarensis, and Senna spectabilis) were well occupied by ants in the home range of the chimpanzees. The ant-inhabited ratio in chimpanzee-foraged litter units was higher than that in the available units in the home range. Chimpanzees fed more often on Crematogaster spp. than on other resident ants and at a higher rate than expected from their occurrence in the litter units. Above three plant species were well occupied by Crematogaster sp. 3 or C. sp. 18. It is concluded that chimpanzees locate ants by selecting litter units of plant species inhabited by ants. PMID:23842594

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

    OpenAIRE

    Edgar Chirinos; Carlos Figueredo A.; Aurora Goyo; Elita Méndez; Luís Rodolfo Rojas Vera

    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...

  10. Efectos del cambio climático sobre pingüinos antárticos

    OpenAIRE

    Barbosa Alcón, Andrés

    2011-01-01

    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 ...

  11. Efectos del cambio climático sobre pingüinos antárticos

    OpenAIRE

    Barbosa, A.

    2011-01-01

    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 u...

  12. Immune defense in leaf-cutting ants

    DEFF Research Database (Denmark)

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

    2011-01-01

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

  13. Ant Colony Optimization for Capacity Problems

    Directory of Open Access Journals (Sweden)

    Tad Gonsalves

    2015-01-01

    Full Text Available This paper deals with the optimization of the capac ity of a terminal railway station using the Ant Colony Optimization algorithm. The capacity of the terminal station is defined as the number of trains that depart from the station in un it interval of time. The railway capacity optimization problem is framed as a typical symmetr ical Travelling Salesman Problem (TSP, with the TSP nodes representing the train arrival / departure events and the TSP total cost representing the total time-interval of the schedul e. The application problem is then optimized using the ACO algorithm. The simulation experiments validate the formulation of the railway capacity problem as a TSP and the ACO algorithm pro duces optimal solutions superior to those produced by the domain experts.

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

    Science.gov (United States)

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

    2010-05-01

    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 (Pachycondyla goeldii and Camponotus femoratus) on the physical characteristics of the plants, and, subsequently, on the diversity of the invertebrate communities that inhabit their tanks. As dispersal agents for the bromeliads, P. goeldii and C. femoratus influence the shape and size of the bromeliad by determining the location of the seedling, from exposed to partially shaded areas. By coexisting on a local scale, the two ant species generate a gradient of habitat conditions in terms of available resources (space and food) for aquatic invertebrates, the diversity of the invertebrate communities increasing with greater volumes of water and fine detritus. Two-species mutualisms are widespread in nature, but their influence on the diversity of entire communities remains largely unexplored. Because macroinvertebrates constitute an important part of animal production in all ecosystem types, further investigations should address the functional implications of such indirect effects. PMID:20503886

  15. 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.

  16. 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.

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

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    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.

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

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    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. A model for collective dynamics in ant raids.

    Science.gov (United States)

    Ryan, Shawn D

    2016-05-01

    Ant raiding, the process of identifying and returning food to the nest or bivouac, is a fascinating example of collective motion in nature. During such raids ants lay pheromones to form trails for others to find a food source. In this work a coupled PDE/ODE model is introduced to study ant dynamics and pheromone concentration. The key idea is the introduction of two forms of ant dynamics: foraging and returning, each governed by different environmental and social cues. The model accounts for all aspects of the raiding cycle including local collisional interactions, the laying of pheromone along a trail, and the transition from one class of ants to another. Through analysis of an order parameter measuring the orientational order in the system, the model shows self-organization into a collective state consisting of lanes of ants moving in opposite directions as well as the transition back to the individual state once the food source is depleted matching prior experimental results. This indicates that in the absence of direct communication ants naturally form an efficient method for transporting food to the nest/bivouac. The model exhibits a continuous kinetic phase transition in the order parameter as a function of certain system parameters. The associated critical exponents are found, shedding light on the behavior of the system near the transition. PMID:26304617

  20. 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.