WorldWideScience

Sample records for debe saber antes

  1. Lo que usted debe saber acerca del dengue

    OpenAIRE

    Vélez, Juan David; Fundación Valle de Lili; Salazar, Juan Carlos; Rosso Suárez, Fernando

    1998-01-01

    Epidemiología del dengue/Transmisión/Presentación clínica/Síntomas en niños/Diagnostico de laboratorio/Dengue clásico/Dengue hemorrágico/Dengue hemorrágico con choque/ ¿Qué es dengue hemorrágico?/ ¿Cuál es la diferencia entre dengue hemorrágico y dengue clásico?/ ¿Qué son las plaquetas?/ ¿Qué puedo hacer para prevenir el dengue?/ ¿Cuándo debo consultar?/ ¿Cuándo se debe hacer un hemograma?/ ¿Cuándo se debe hospitalizar un paciente con dengue?

  2. Cáncer colorrectal: Lo que debe saber (Colorectal Cancer - What You Need to Know)

    Centers for Disease Control (CDC) Podcasts

    2011-07-05

    Este podcast se basa en un informe de Vital Signs, publicado por los CDC en julio del 2011. El cáncer colorrectal causa todos los años la muerte de unos 50,000 hombres y mujeres. ¡Las pruebas de detección pueden salvar vidas! Estas pruebas pueden encontrar tejido anormal que puede ser extraído antes de que se convierta en cáncer y pueden encontrar el cáncer en su etapa inicial, cuando es más fácil de tratar. Si usted tiene 50 años o más, hable con su médico y hágase las pruebas de detección del cáncer colorrectal.  Created: 7/5/2011 by Centers for Disease Control and Prevention (CDC).   Date Released: 8/1/2011.

  3. CDC Signos Vitales: El TDAH en niños pequeños: Lo que debe saber (ADHD in Young Children: What You Should Know)

    Centers for Disease Control (CDC) Podcasts

    2016-05-03

    Este podcast está basado en el informe Signos Vitales de los CDC de mayo del 2016. Para los niños de dos a cinco años con TDAH, se recomienda recetar terapia del comportamiento antes que medicamentos. La terapia enseña a los padres formas de mejorar el comportamiento de su hijo y puede ser tan eficaz como los medicamentos, sin el riesgo de producir efectos secundarios.  Created: 5/3/2016 by National Center for Emerging and Zoonotic Infectious Diseases (NCEZID).   Date Released: 5/3/2016.

  4. CDC Signos Vitales: El TDAH en niños pequeños: Lo que debe saber(ADHD in Young Children: What You Should Know)

    Centers for Disease Control (CDC) Podcasts

    Este podcast está basado en el informe Signos Vitales de los CDC de mayo del 2016. Para los niños de dos a cinco años con TDAH, se recomienda recetar terapia del comportamiento antes que medicamentos. La terapia enseña a los padres formas de mejorar el comportamiento de su hijo y puede ser tan eficaz como los medicamentos, sin el riesgo de producir efectos secundarios.

  5. ANT

    DEFF Research Database (Denmark)

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

    2017-01-01

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

  6. SABER Optical Design

    International Nuclear Information System (INIS)

    Erickson, R

    2006-01-01

    SABER, the South Arc Beam Experimental Region, is a proposed new beam line facility designed to replace the Final Focus Test Beam at SLAC. In this paper, we outline the optical design features and beam parameters now envisioned for SABER. A magnetic chicane to compress positron bunches for SABER and a bypass line that could transport electrons or positrons from the two-thirds point of the linac to SABER, bypassing the LCLS systems, are also discussed

  7. Saberes docentes da dança

    Directory of Open Access Journals (Sweden)

    Silvia Camara Soter da Silveira

    2016-12-01

    Full Text Available Este artigo trata do tema saberes docentes e busca sua relação com o ensino da dança na escola. A categoria saber docente tornou-se central no campo da formação de professores a partir dos anos 1990 no Brasil. Neste trabalho, o saber docente é abordado através de dois autores que se dedicaram ao tema: Maurice Tardif (2012 e Selma Garrido Pimenta (2012, na busca de refletir sobre as especificidades do saber docente daquele que ensina dança na escola. O saber docente se constitui, de uma parte, na formação inicial e contínua em instituições de formação de professores e, de outra parte, se desenvolve ao longo da vida dos estudantes e professores, em contextos distintos destas instituições, nas vivências destes professores antes da chegada à formação inicial, nas marcas que a escolarização deixou, na articulação do que aprendem nos cursos de formação de professores com a realidade da escola e, também, pela própria prática docente no início da atividade profissional, no contexto da escola, através das trocas com seus pares. No caso da dança, no saber docente se mesclam saberes constituídos no ensino formal como no não formal, que na trajetória dos docentes de dança parece ter um papel importante.

  8. "Saber" and "Conocer."

    Science.gov (United States)

    Taylor, Kathy

    1985-01-01

    Attempts to redefine the meaning of the two Spanish verbs "saber" and "conocer" and explores some possible extralinguistic factors affecting their usage. Shows that "conocer" represents knowledge which is firsthand and that this type of knowledge is a building block for the more thorough, systematic knowledge represented by "saber." (SED)

  9. Depresion: Lo Que Toda Mujer Debe Saber (Depression: What Every Woman Should Know).

    Science.gov (United States)

    National Inst. of Mental Health (DHHS), Bethesda, MD.

    This publication, written in Spanish, explains why women are at greater risk for depression than men. Types of depressive illnesses are explained along with the symptoms. It states that some women are predisposed genetically to depression but biochemical, environmental, psychological, and social factors also often contribute to its occurrence.…

  10. Hepatitis C: Lo que debe saber (Hepatitis C: What You Need to Know)

    Centers for Disease Control (CDC) Podcasts

    2013-05-07

    Este podcast está basado en el informe Vital Signs de los CDC de mayo del 2013. Trata sobre la hepatitis C, una infección viral grave, y la necesidad de que todas las personas nacidas entre 1945 y 1964 se hagan una prueba de detección.  Created: 5/7/2013 by Centers for Disease Control and Prevention (CDC).   Date Released: 5/7/2013.

  11. Fundamentos del saber administrativo

    OpenAIRE

    Paola Podestá Correa; Juan Carlos Jurado Jurado

    2005-01-01

    El presente texto tiene por objetivo delimitar, de manera general, algunos de los conceptos más importantes del saber administrativo; en primera instancia, práctica administrativa y saber administrativo. Estos conceptos están ligados con los que en el texto se denominan fundamentos de la administración, estableciendo consensos sobre algunas expresiones comunes en el lenguaje administrativo, y contribuyendo a la comprensión de estos temas para los estudiantes de los primeros niv...

  12. Performance analysis in saber.

    Science.gov (United States)

    Aquili, Andrea; Tancredi, Virginia; Triossi, Tamara; De Sanctis, Desiree; Padua, Elvira; DʼArcangelo, Giovanna; Melchiorri, Giovanni

    2013-03-01

    Fencing is a sport practiced by both men and women, which uses 3 weapons: foil, épée, and saber. In general, there are few scientific studies available in international literature; they are limited to the performance analysis of fencing bouts, yet there is nothing about saber. There are 2 kinds of competitions in the World Cup for both men and women: the "FIE GP" and "A." The aim of this study was to carry out a saber performance analysis to gain useful indicators for the definition of a performance model. In addition, it is expected to verify if it could be influenced by the type of competition and if there are differences between men and women. Sixty bouts: 33 FIE GP and 27 "A" competitions (35 men's and 25 women's saber bouts) were analyzed. The results indicated that most actions are offensive (55% for men and 49% for women); the central area of the piste is mostly used (72% for men and 67% for women); the effective fighting time is 13.6% for men and 17.1% for women, and the ratio between the action and break times is 1:6.5 for men and 1:5.1 for women. A lunge is carried out every 23.9 seconds by men and every 20 seconds by women, and a direction change is carried out every 65.3 seconds by men and every 59.7 seconds by women. The data confirm the differences between the saber and the other 2 weapons. There is no significant difference between the data of the 2 different kinds of competitions.

  13. Algab õppus "Saber Strike"

    Index Scriptorium Estoniae

    2014-01-01

    Täna algab Eestis, Lätis ja Leedus Ameerika Ühendriikide Euroopa väekoondise õppus "Saber Strike", mille eesmärk on maaväeüksuste koostöö harjutamine. Õppusest võtab osa üle 2000 kaitseväelase Baltimaadest, USAst, Ühendkuningriigist, Taanist, Norrast, Soomest ja Saksamaalt. Eestist osaleb õppusel ligi 400 kaitseväelast

  14. Saberes e práticas de acompanhantes sobre complicações respiratórias pós-cirúrgicas no idoso, compartilhados com a enfermeira Conocimientos y prácticas de acompañantes sobre complicaciones respiratorias posquirúrgicas en ancianos, compartidas con la enfermera Knowledge and experiences of caregivers for post-surgical respiratory complications in elderly people, shared with the nurse

    Directory of Open Access Journals (Sweden)

    Maria da Luz Ferreira Xavier

    2012-09-01

    Full Text Available Pesquisa convergente-assistencial cujo objetivo foi analisar saberes e práticas de acompanhantes voltados à prevenção de complicações respiratórias pós-cirúrgicas no idoso, com vistas a traçar um plano de cuidados a ser implementado para esses clientes. As bases teórico-conceituais pautaram-se na pedagogia problematizadora de Freire. Os sujeitos foram 14 acompanhantes de idosos em pré-operatório. Utilizou-se técnica de entrevista individual e observação participante, e análise de conteúdo temática. Os resultados revelaram que as acompanhantes acumulam saberes, acerca de cuidados básicos no pós-operatório, capazes de prevenir problemas respiratórios. Pela dialogicidade construiu-se um plano de cuidados compartilhado a ser realizado com o idoso, consequência da integração de saberes e práticas dos acompanhantes com os da enfermeira-pesquisadora na visita pré-operatória. Resultaram novas ou revisitadas práticas, culminando em um cuidado congruente às reais necessidades dos clientes e seus acompanhantes, tornando-os parceiros no processo de cuidar.Investigación convergente y asistencial, con objetivo de analizar los conocimientos y prácticas de acompañantes dirigidos a la prevención de complicaciones respiratorias posquirúrgicas en el anciano, a fin de elaborar un plan de cuidados para ser implementado con estos clientes. Las bases teórica y conceptual se pautaron en la pedagogía problematizada de Paulo Freire. Los sujetos fueron 14 acompañantes de clientes ancianos en el período preoperatorio. Se utilizó la técnica de entrevistas individuales y de observación participante y análisis de contenido temático. Los resultados revelaron que las acompañantes acumulan saber, acerca de cuidados básicos en el pos-operatorio, capaces de prevenir problemas respiratorios. A partir de conversaciones, se construyó un plan de cuidados compartido a ser realizado con el anciano, resultante de la integración de

  15. CDC Signos Vitales: El zika y el embarazo Lo que debe saber (Zika and Pregnancy: What You Should Know)

    Centers for Disease Control (CDC) Podcasts

    2016-04-01

    Este podcast se basa en el informe de Signos Vitales de los CDC de abril del 2016. Una mujer embarazada infectada por el virus del Zika puede pasar el virus a su feto. El virus se ha vinculado a la microcefalia, un defecto congénito grave. Este podcast trata sobre cómo protegerse del virus del Zika.  Created: 4/1/2016 by National Center for Emerging and Zoonotic Infectious Diseases (NCEZID).   Date Released: 4/1/2016.

  16. Seguimiento del paciente asmático: qué debe saber el farmacéutico comunitario

    Directory of Open Access Journals (Sweden)

    Plaza Zamora J

    2013-03-01

    Full Text Available El asma tiene una prevalencia de entre un 1 y un 18% dependiendo del país. En el proceso de atención al paciente, y a través de los síntomas que presenta (disnea, tos, sibilancias, opresión torácica, el farmacéutico comunitario puede hacer educación sanitaria para evitar los agentes causales del asma, sobre cómo usar el dispositivo de inhalación prescrito por el médico, explicar al paciente su medicación, cómo es su tratamiento para conocer mejor su enfermedad, qué signos y síntomas denotan una falta de control de la misma, qué métodos se pueden usar para monitorizar la evolución del asma, detectar una posible falta de efectividad del tratamiento por tener sintomatología a pesar de estar usando adecuadamente el dispositivo de inhalación, sospechar que exista algún medicamento causante del asma, repasar el resto de medicación que usa por si existieran interacciones que afectaran tanto a la efectividad como a la seguridad del tratamiento. Existe un importante infradiagnóstico del asma, un 57,5% según el ECRHS (siglas del inglés European Community Respiratory Health Survey. En la farmacia comunitaria se puede hacer cribado de la enfermedad con la ayuda de cuestionarios validados en niños y no validados en adultos. Mediante la presente revisión se pretende ofrecer al farmacéutico comunitario una herramienta práctica para su labor diaria de atención al paciente asmático.

  17. CDC Signos Vitales: El zika y el embarazo Lo que debe saber(Zika and Pregnancy: What You Should Know)

    Centers for Disease Control (CDC) Podcasts

    Este podcast se basa en el informe de Signos Vitales de los CDC de abril del 2016. Una mujer embarazada infectada por el virus del Zika puede pasar el virus a su feto. El virus se ha vinculado a la microcefalia, un defecto congénito grave. Este podcast trata sobre cómo protegerse del virus del Zika.

  18. Disciplina, saber y existencia

    Directory of Open Access Journals (Sweden)

    Carlos Alberto Ospina H

    2004-01-01

    Full Text Available El presente trabajo aborda, de manera didáctica, la importante distinción entre disciplina y profesión y propone entender por disciplina la formación del carácter y la personalidad sin invalidar el significado genuino de disciplina académica o científica. Al presentar dos posturas clásicas frente al saber: la de Aristóteles y la de Comte, se muestran los límites de ésta última cuando pretende abarcar la vida misma con criterios de eficiencia y productividad, anulando el libre juego de la existencia que se regula por criterios muy distintos a la universalidad teórica y a la operatividad técnica. La disciplina, así entendida, no alude al mero estrechamiento de la mirada sobre el mundo o a pautas de acción fijas; se refiere, por el contrario, a la ampliación de los criterios de actuación que nos ayuden a decidir sobre lo mejor para la propia vida y la de los demás. Al aplicar estos elementos de reflexión a la educación contemporánea, se concluye en la necesidad de buscar la formación disciplinada de la persona que involucre necesariamente al menos el desarrollo de dos características formativas básicas: la autonomía y el espíritu crítico.

  19. Disciplina, saber y existencia

    Directory of Open Access Journals (Sweden)

    Carlos Alberto Ospina

    2004-10-01

    Full Text Available El presente trabajo aborda, de manera didáctica, la importante distinción entre disciplina y profesión y propone entender por disciplina la formación del carácter y la personalidad sin invalidar el significado genuino de disciplina académica o científica. Al presentar dos posturas clásicas frente al saber: la de Aristóteles y la de Comte, se muestran los límites de ésta última cuando pretende abarcar la vida misma con criterios de eficiencia y productividad, anulando el libre juego de la existencia que se regula por criterios muy distintos a la universalidad teórica y a la operatividad técnica. La disciplina, así entendida, no alude al mero estrechamiento de la mirada sobre el mundo o a pautas de acción fijas; se refiere, por el contrario, a la ampliación de los criterios de actuación que nos ayuden a decidir sobre lo mejor para la propia vida y la de los demás. Al aplicar estos elementos de reflexión a la educación contemporánea, se concluye en la necesidad de buscar la formación disciplinada de la persona que involucre necesariamente al menos el desarrollo de dos características formativas básicas: la autonomía y el espíritu crítico.

  20. ACCIONES DOCENTES: SABERES EN PUGNA

    Directory of Open Access Journals (Sweden)

    MARCELA GAETE VERGARA

    2011-01-01

    Full Text Available El artículo presenta algunas reflexiones en relación a la tríada saber, discurso y acción docente, que constituye parte de los resultados de una investigación doctoral, cuyo propósito es comprender el sentido, que han construido los profesores de filosofía en relación a la enseñanza y el aprendizaje de la disciplina y que subyace en la configuración de un saber para la escuela. La investigación de carácter cualitativa y hermenéutica utiliza como técnicas de recolección de información la entrevista en profundidad y análisis de materiales didácticos de autoría de los docentes participantes del estudio. Los principales resultados indican que existe una tensión permanente entre los saberes docentes provenientes de los dispositivos pedagógicos institucionalizados que obedecen una racionalidad instrumental con aquellos saberes que son configurados desde la experiencia íntima con la disciplina y su enseñanza. Tal tensión, evidencia que los docentes no son simples aplicadores de teorías o currículos sino que van constituyendo saberes no legitimados desde las formaciones discursivas dominantes. No obstante, tales saberes se mantienen en la esfera privada, pues la escuela y la formación docente no dan espacios para que los maestros puedan narrar sus acciones, y con ello, constituirse en sujetos políticos.

  1. Eutonia "O saber do corpo"

    OpenAIRE

    Miriam Dascal

    2005-01-01

    Resumo: Nesta dissertação realizo uma reflexão sobre os conceitos teóricos e práticos que fundamentam o trabalho de Eutonia e apresento uma pesquisa que elaborei a partir destes conceitos. A Eutonia propõe um campo metodológico que envolve o autoconhecimento do próprio corpo e de sua atividade de movimento. Estabelece um campo investigatório no qual revelam-se conhecimentos, que denomino "o saber do corpo". Refletindo sobre este "saber", reconheço e o relaciono com os pressupostos estabeleci...

  2. El proceso de construcción del saber pedagógico en Educación Matemática

    OpenAIRE

    Sotos Serrano, María Antonia; López Esteban, María Carmen

    2015-01-01

    Presentamos el proceso de construcción del saber pedagógico de la profesora M. Antònia Canals i Tolosa, utilizando el modelo de los saberes docentes de Tardif. Dicho modelo destaca la importancia de los saberes experienciales y del proceso de reflexión compartida, necesario para construir el saber pedagógico. En el caso de la profesora Canals, la importancia de esos dos elementos es evidente, y su análisis permite indagar en la historia de la educación en general, y de la educación matemática...

  3. Saberes docentes da dança

    OpenAIRE

    Silvia Camara Soter da Silveira; Monique Andries Nogueira

    2016-01-01

    Este artigo trata do tema saberes docentes e busca sua relação com o ensino da dança na escola. A categoria saber docente tornou-se central no campo da formação de professores a partir dos anos 1990 no Brasil. Neste trabalho, o saber docente é abordado através de dois autores que se dedicaram ao tema: Maurice Tardif (2012) e Selma Garrido Pimenta (2012), na busca de refletir sobre as especificidades do saber docente daquele que ensina dança na escola. O saber docente se constitui, de uma par...

  4. Transferência: amor ao saber Transference: the love to know

    Directory of Open Access Journals (Sweden)

    Gilberto Gênova Gobbato

    2001-06-01

    Full Text Available Procura-se evidenciar um novo direcionamento para a questão do amor de transferência com o ensino de Jacques Lacan. Trata-se, antes de mais nada, do questionamento do lugar do analista para responder a esse amor. A tese de Lacan é de que esse amor é endereçado ao saber: o analisando coloca o analista na posição de sujeito suposto saber, de um saber consistente, de um saber que sabe. Entretanto, da perspectiva do analista o saber não sabe. O analista deve conduzir a análise visando esse não saber como verdade.The article tries to make evident a new direction in the question of transference love according to Lacan's teaching. At first, it deals with the question of the analyst's position in order to answer to this love. Lacan's thesis relies on the fact that this love is addressed to knowledge. Based on that, the analyzand puts the analyst in the position of a subject supposed to know, supposed to have a consistent knowledge, a knowledge that knows. However, from the analyst's point of view, knowledge does not know. Having this in mind as the truth, the analyst must analyze his patient.

  5. Saber escuchar: Un intangible valioso

    Directory of Open Access Journals (Sweden)

    Alexis Codina

    2007-07-01

    Full Text Available La habilidad de “saber escuchar” es más difícil de encontrar y desarrollar que la de ser “buen comunicador”, pero proporciona más autoridad e influencia que esta última, dicen los especialistas. Si Ud. es buen comunicador, pero no sabe escuchar, corre el riesgo de comunicar en forma elocuente cosas que no le interesan a la gente. Entre las habilidades que caracterizan a directivos y profesionales exitosos se encuentra la de saber escuchar, su ausencia es uno de los factores generadores de conflictos. Entre los tópicos principales que estudian los especialistas en este tema y que son comentados en este artículo están: los beneficios de saber escuchar, conductas no productivas cuando escuchamos, razones que nos impiden escuchar adecuadamente, lugares desde los que escuchamos, los objetivos de la comunicación y cómo tratarlos así como propuestas de comportamientos y prácticas para desarrollar esta habilidad, tan importante para las relaciones interpersonales.

  6. SABER-School Finance : Data Collection Instrument

    OpenAIRE

    World Bank

    2015-01-01

    The aim of the SABER-school finance initiative is to collect, analyze and disseminate comparable data about education finance systems across countries. SABER-school finance assesses education finance systems along six policy goals: (i) ensuring basic conditions for learning; (ii) monitoring learning conditions and outcomes; (iii) overseeing service delivery; (iv) budgeting with adequate an...

  7. SABER-School Finance: Data Collection Instrument

    Science.gov (United States)

    King, Elizabeth; Patrinos, Harry; Rogers, Halsey

    2015-01-01

    The aim of the SABER-school finance initiative is to collect, analyze and disseminate comparable data about education finance systems across countries. SABER-school finance assesses education finance systems along six policy goals: (i) ensuring basic conditions for learning; (ii) monitoring learning conditions and outcomes; (iii) overseeing…

  8. Beyond ANT

    DEFF Research Database (Denmark)

    Jansen, Till

    2017-01-01

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

  9. Calle y Saberes en Movimiento

    Directory of Open Access Journals (Sweden)

    Laura Daniela Aguirre Aguilar

    2010-01-01

    Full Text Available En México el rezago, el ausentismo, la deserción escolar, el trabajo a temprana edad y el inicio de una vida en la calle, en repetidas ocasiones son consecuencia de un núcleo familiar desarticulado o de una débil relación intrafamiliar, así como de una condición socioeconómica en desventaja. Ante esta problemática, la Secretaría de Educación Pública, instancia gubernamental encargada de garantizar una educación de calidad para la población, trabaja coordinadamente con organizaciones de la sociedad civil e instancias públicas, para la reintegración a los espacios educativos de los niños, niñas y jóvenes en situación de calle.

  10. La mercantilización del saber

    Directory of Open Access Journals (Sweden)

    Mario Solano Solano

    2007-05-01

    Full Text Available En este artículo se establece que el cálculo económico que rige la gestión económica típica del capitalismo se irradia también a la esfera de la producción, distribución, circulación y consumo del saber. Por ello, la maximización del beneficio llega a ser un impulso fundamental en la economía del saber, particularmente en las economías capitalistas más desarrolladas. Esta lógica es la que subyace a la creciente privatización y mercantilización del saber, la cual adquiere múltiples manifestaciones, entre ellas la incrementada comercialización de los productos culturales (libros, discos de música y de video, pero también de la creciente ingerencia de la lógica de la acumulación capitalista en los procesos más específicos de la dinámica del saber, como lo son la evaluación de la investigación y su transmisión mediante la educación. Así, en la llamada “condición posmoderna” el saber deviene en una simple mercancía que se produce por el beneficio económico o el incremento de poder a quien la financie y no por un compromiso con la verdad. Esta mercantilización del saber se une a las gravísimas amenazas (devastación ecológica, desigualdad social que pesan sobre la simple posibilidad de sobrevivencia de la especie humana sobre el planeta Tierra.

  11. Lo que todo practicante de la psicología debe saber sobre las personas ateas y el ateísmo

    Directory of Open Access Journals (Sweden)

    Alfonso Martínez-Taboas

    2011-01-01

    Full Text Available En este escrito los autores hacen una revisión de datos relevantes a las características socio demográficas de las personas ateas y a los supuestos psicológicos que han sido esbozados por diversos psicólogos/ as sobre esta población. Los autores documentan las formas en que históricamente las personas ateas han sido encuadradas dentro de la psicología clínica, como neuróticas e inestables. Sin embargo, la evidencia de estudios publicados en las últimas décadas no apoya tales caracterizaciones. Al contrario, muchas personas ateas no sólo no presentan psicopatología, sino que muestran flexibilidad cognitiva al momento de pasar juicio social sobre otros grupos minoritarios. Se demuestra también que a nivel macro-social, las sociedades en el mundo que son más seculares poseen mejores parámetros de salud social. Los autores proponen que los practicantes de la psicología deben de conocer más a fondo las particularidades e idiosincrasias de las personas ateas para ofrecerles un servicio psicológico libre de estereotipos y prejuicios.

  12. Manejar bajo los efectos del alcohol: Lo que usted debe saber (Drinking and Driving – What You Need to Know)

    Centers for Disease Control (CDC) Podcasts

    2011-10-04

    Este podcast se basa en un informe de Vital Signs, publicado por los CDC en octubre del 2011. Tomar alcohol y conducir un vehículo sigue siendo un problema serio. Todos los años, casi 11,000 personas mueren en choques de vehículos atribuidos a conductores bajo los efectos del alcohol. Si usted está tomando alcohol, designe a alguien que no esté tomando que maneje, llame a un taxi o pida que lo lleven a casa. Además, use siempre su cinturón de seguridad. Los cinturones de seguridad reducen en un 50 por ciento los riesgos de muertes y lesiones graves por colisiones vehiculares.  Created: 10/4/2011 by Centers for Disease Control and Prevention (CDC).   Date Released: 10/4/2011.

  13. Virus del Nilo Occidental: Lo que debe saber - Agosto de 2012 (West Nile Virus: What You Need to Know Now - August 2012)

    Centers for Disease Control (CDC) Podcasts

    2012-08-21

    Este podcast nombra los estados en donde se han notificado la mayoría de casos del virus del Nilo Occidental y explica la manera en que las personas se pueden proteger contra ese virus.  Created: 8/21/2012 by .   Date Released: 8/22/2012.

  14. Psicoterapia cognitiva y religión: ¿Qué debe saber un terapeuta cognitivo de la diversidad religiosa de la Capital Federal y el Conurbano Bonaerense?

    Directory of Open Access Journals (Sweden)

    Guido Pablo Korman

    2014-12-01

    Full Text Available Los autores exploran la relación entre la psicoterapia y la religión. En primer lugar, examinan el fenómeno religioso en la práctica clínica. En segundo término, indaga el lugar de lo religioso en el Manual Diagnóstico y Estadístico de los Trastornos Mentales (DSM-IV. En tercer lugar, describe la relación entre desconocimiento y patologización de las creencias religiosas. En cuarto término, refiere el acercamiento entre la terapia cognitiva y la religión. En quinto lugar, describe la creciente importancia de la incorporación dentro de los modelos cognitivos de distintos sistemas de creencias a la práctica clínica y relaciona esta situación con el eclecticismo técnico propio de la terapia cognitiva. Por último, describe las distintas religiones existentes en la Ciudad Autónoma de Buenos Aires y el conurbano bonaerense a fi n de manifestar la diversidad religiosa en nuestro medio.

  15. Adolescentes que beben y conducen: Lo que usted debe saber (Teen Drinking and Driving – What You Need to Know)

    Centers for Disease Control (CDC) Podcasts

    2012-10-02

    Este podcast se basa en un informe de Vital Signs, publicado por los CDC en octubre del 2012. Es peligroso e ilegal que los adolescentes tomen alcohol y manejen. Aun así, 1 de cada 10 adolescentes de secundaria bebió y luego se puso al volante en el 2011. Establecer un contrato para manejar entre padre e hijo es una buena forma para ayudar a mantener a los jóvenes que conducen fuera de peligro.  Created: 10/2/2012 by Centers for Disease Control and Prevention (CDC).   Date Released: 10/2/2012.

  16. Editorial. Fundamentos para una Pedagogía del Saber y del No Saber

    Directory of Open Access Journals (Sweden)

    Agustín de la Herrán Gascón

    2018-03-01

    Full Text Available El libro titulado “Fundamentos para una Pedagogía del Saber y del No Saber” (Herrán Gascón, A. de la, São Paulo: Edições Hipótese, 2018 sirve el propósito de contribuir a la necesaria renovación radical de la Pedagogía y de la Didáctica, para favorecer una educación y una formación más coherentes y completas con base en la conciencia. Se apoya en la tesis de que la herencia de Sócrates es limitante para la educación, y condiciona el constructo ‘formación’ y la evolución de la Pedagogía y de la Didáctica. Hoy ambas disciplinas son parcialmente válidas, porque su base, erigida sobre el aprender, el conocer y sobre una idea parcial de formación, es incompleta. Su énfasis en el saber –léase no sólo aprendizaje de saberes, sino el saber pensar, saber sentir, saber ser, saber convivir, saber hacer, saber gestionar las emociones, saber contenidos instructivos u orientadores, saber competencias, etc. -limita la educación y la formación. No parecen darse cuenta de esta posibilidad, al parecer, los organismos internacionales de educación, las leyes y los sistemas educativos, ni la mayor parte de pedagogos e investigadores de la educación. Históricamente, se ha arrastrado en estas disciplinas un sesgo, al no incorporarse la enseñanza de grandes pedagogos o maestros de la formación de Oriente, con una mirada diferente. Nuestra posición es que sin la comprensión que ofrecen –y que al parecer se ignora por el ‘occidentalismo’ (o ismo de Occidente en que vivimos, potenciado por la globalización,- la educación no puede estar completa, ni puede comprenderse en absoluto.

  17. La animación a la lectura en el segundo ciclo de Educación Infantil. Géneros literarios, actividades, estrategias y técnicas para fomentar el gusto y hábito lector antes de saber leer.

    OpenAIRE

    Pajares Paredes, Beatriz

    2013-01-01

    Con este Trabajo Fin de Grado dirigido al primer curso del Segundo ciclo de Educación Infantil (3 años), pretendo presentar una propuesta de intervención de animación a la lectura a través de estrategias, técnicas y actividades; utilizando la literatura infantil más apropiada para estas edades, manejando especialmente, el cuento y la poesía. En un primer momento, hablaré de los beneficios que comporta desarrollar el gusto por la lectura en los niños y en las niñas, antes incluso de que é...

  18. La terrible soledad del saber The terrible solitude of knowledge

    Directory of Open Access Journals (Sweden)

    Restrepo Gabriel

    1999-12-01

    Full Text Available Este ensayo glosa uno de los frentes de trabajio mas atines a Jesús A. Bejarano: la historia y el análisis de la ciencia y de las profesiones, en este caso de la economía. El eje de estos comentarios es la relación entre ciencia económica y poder, partiendo de la queja de Bejarano ante la falsa de reflexión critica sobre este tema, y considerando además su parabolavital como un ejemplode tensión dramatica entre saber y poder, dada la estructura política de Colombia.This essay discusses one of Bejarano's favorite fields of study: the history and analysis of science, as applied to economics. The main line of argument is determined by the relation between economic science and power, which in Bejarano' s opinion had not been adequately considered. His life is taken as a parable of the dramatic tension between knowledge and power within the political structure of Colombia.

  19. 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 ...

  20. Sarah J. Hale High School-Project SABER.

    Science.gov (United States)

    Rosenblatt, Harold

    Project SABER, which operated in Sarah J. Hale High School in South Brooklyn, New York, consisted of bilingual instructional and supportive services to 9th and 10th grade Spanish language students. Students received bilingual instruction in social studies, science, math, and Spanish. All the SABER students received English as a second language…

  1. Marcos de referencia de saberes digitales

    Directory of Open Access Journals (Sweden)

    Alberto Ramírez Martinell

    2015-07-01

    Full Text Available En este artículo se muestra una recopilación de estándares, indicadores y recomendaciones elaboradas por organizaciones como OCDE, UNESCO, ISTE y ECDL sobre el uso de Tecnologías de la Información y Comunicación (TIC. Esta información la presentamos mediante el análisis de contenidos de cada uno de los cuatro criterios a partir de tres enfoques: saberes informáticos, literacidad informacional y ciudadanía digital, ya que –según las organizaciones estudiadas– esto, acompañado del desarrollo de competencias de tipo transversal, aseguran un impacto positivo de las TIC en el contexto académico.

  2. The use of the saber in the army of Napoleon

    Directory of Open Access Journals (Sweden)

    Gevaert Bert

    2016-04-01

    Full Text Available Though Napoleonic warfare is usually associated with guns and cannons, edged weapons still played an important role on the battlefield. Swords and sabers could dominate battles and this was certainly the case in the hands of experienced cavalrymen. In contrast to gunshot wounds, wounds caused by the saber could be treated quite easily and caused fewer casualties. In 18th and 19th century France, not only manuals about the use of foil and epee were published, but also some important works on the military saber: de Saint Martin, Alexandre Muller… The saber was not only used in individual fights against the enemy, but also as a duelling weapon in the French army.

  3. 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.

  4. saberes sócio-culturais

    Directory of Open Access Journals (Sweden)

    Karina Machado Siqueira

    2006-01-01

    Full Text Available La investigación tuvo como objetivo identificar conductas adoptadas por los clientes antes de buscar los servicios de la salud y evidenciar los cambios de comportamiento cuanto a las creencias populares relacionadas a la prevención y la curación de las enfermedades, posterior a la orientación profesional. Estudio cualitativo, de tipo descriptivo-exploratorio, desarrollado en Goiânia - GO. La recolecta de dados fue realizada por medio de la entrevista individual junto a los usuarios de tres servicios del Sistema Único de Salud. Se dectecto que antes de buscar los servicios de salud, los clientes utilizaban los recursos populares como tés, curanderismo, baños y emplastos en la prevención y el tratamiento de las enfermedades. Se evidenció que ellos no abandonan la práctica popular, a pesar de la orientación médica, porque todavia creen en su eficacia. Se concluye que el cambio de hábitos relacionados a la salud es un proceso difícil siendo aún necesario respetar las tradiciones y opiniones del usuario al establecerse conductas y tratamientos.

  5. Riding with the ants

    NARCIS (Netherlands)

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

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

  6. 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...

  7. Chapter 3: Design of the Saber-Tooth Project.

    Science.gov (United States)

    Ward, Phillip

    1999-01-01

    Used data from interviews, surveys, and document analysis to describe the methods and reform processes of the Saber Tooth Project, examining selection of sites; demographics (school sites, teachers, data sources, and project assumptions); and project phases (development, planning, implementation, and support). The project's method of reform was…

  8. Chapter 1: An Introduction to the Saber-Tooth Project.

    Science.gov (United States)

    Ward, Phillip

    1999-01-01

    Introduces a theme issue on the Saber-Tooth Project, an ongoing reform effort involving a university and school district that collaborate to improve middle school physical education by improving teaching conditions and engaging teachers in professional development emphasizing curriculum improvement. The monograph explains the nature of…

  9. (Sem saber e (com poder nos estudos organizacionais

    Directory of Open Access Journals (Sweden)

    José Henrique de Faria

    Full Text Available Bacon afirma que saber é poder. Tragtenberg contesta. Essa discussão, na contemporaneidade, faz-se mais importante do que se possa imaginar. Por isso, o objetivo central deste artigo é verificar as relações entre saber e poder, na atualidade, levando em consideração o papel da ciência e dos elementos imediatos a ela relacionados. Quanto aos objetivos específicos deste estudo, destacam-se: · compreender o sentido da filosofia e da ciência e suas relações com a ideologia; · verificar como o discurso da neutralidade axiológica da ciência se apresenta como mito da modernidade e como se dá a presença da "fé" na filosofia e na ciência, na contemporaneidade; · refletir sobre a consolidação da ciência como força produtiva e/ou como mercadoria no atual sistema econômico; · destacar a importância do complexo industrial militar como financiador de grande parte dos atuais estudos científicos; · entender o processo de racionalização, avaliando a importância do pragmatismo e da burocracia universitária como afirmação da ciência na atualidade. O texto conclui que tanto é possível a existência de saber como poder (Bacon como a de não saber, mas com poder (Tragtenberg para compreendermos a relação entre saber e poder.

  10. An overview of the SABER experiment for the TIMED mission

    Science.gov (United States)

    Mlynczak, Martin G.; Russell, James M., III

    1995-01-01

    The Sounding of the Atmosphere Using Broadband Emission Radiometry (SABER) experiment has been selected for flight on the Thermosphere-Ionosphere-Mesosphere Energetics and Dynamics (TIMED) mission expected to fly in the latter part of this decade. The primary science goal of SABER is to achieve fundamental and important advances in understanding of the energetics, chemistry, and dynamics, in the atmospheric region extending from 60 km to 180 km altitude, which has not been comprehensively observed on a global basis. This will be accomplished using the space flight proven experiment approach of broad spectral band limb emission radiometry. SABER will scan the horizon in 12 selected bands ranging from 1.27 microns to 17 microns wavelength. The observed vertical horizon emission profiles will be mathematically inverted in ground data processing to provide vertical profiles with 2 km vertical resolution, of temperature, O3, H2O, NO, NO2, CO, and CO2. SABER will also observe key emissions needed for energetics studies at 1.27 microns (O2((sup 1)delta)), 2 microns (OH(v = 7,8,9)) 1.6 microns (OH(v = 3,4,5)), 4.3 microns (CO2(v(sub 3))) 5.3 microns (NO) 9.6 microns (O3), and 15 microns (CO2(v(sub 2))). These measurements will be used to infer atomic hydrogen and atomic oxygen, the latter inferred three different ways using only SABER observations. Measurements will be made both night and day over the latitude range from the southern to northern polar regions.

  11. Formación de saberes políticos: aportes de investigaciones psicológicas

    OpenAIRE

    Lenzi, Alicia; D'Avirro, María Julieta; Pataro, María Alejandra; Areste, María Silvina

    2007-01-01

    Se examina la cuestión de los saberes políticos en niños, jóvenes y adultos, desde las contribuciones de investigaciones de la psicología del desarrollo y la psicología educacional, con ciertas referencias a la psicología social y política. Subyace a esta cuestión el polémico concepto de ciudadanía y concepciones divergentes acerca de la formación ciudadana y sus prácticas. La literatura especializada revela una creciente preocupación por la formación de los futuros ciudadanos ante la mundial...

  12. Saber o no saber… Derecho e información genética

    Directory of Open Access Journals (Sweden)

    José Ignacio Solar Cayón

    2013-12-01

    Full Text Available El extraordinario desarrollo de las técnicas genéticas, con su formidable capacidad de afectación a la autonomía personal y de invasión de los derechos individuales, está teniendo un impacto profundo en el pensamiento jurídico, obligándonos a revisar algunos de los presupuestos en que se funda nuestra concepción de los derechos fundamentales. Así, el reconocimiento del derecho del individuo a no conocer sus datos genéticos parece desafiar nociones esenciales como las de autonomía y racionalidad del sujeto de derechos, vinculadas en el proyecto ilustrado de emancipación del individuo a la idea de pleno acceso al conocimiento. Sin embargo, la propia idea de “ignorancia” no resulta ajena al discurso de fundamentación de los derechos fundamentales, como prueba el papel esencial que el “velo de la ignorancia” desempeña en la revisión de la tradición liberal efectuada por John Rawls. A partir de la teoría de éste y de John Stuart Mill se indaga en los fundamentos filosóficos del derecho a no saber los datos genéticos y en sus límites, ante la existencia de posibles derechos de terceros a acceder a esa información. Asimismo, se pone de manifiesto el papel que en este nuevo contexto juega el Derecho como instancia administradora del conocimiento y de la ignorancia, ante la amenaza de un determinismo genético que parece poner en cuestión en última instancia la idea misma de libertad individual.

  13. Entre el poder y el saber: Recuento del pensamiento latinoamericano

    Directory of Open Access Journals (Sweden)

    Luis Ramiro Beltrán Salmón

    2008-12-01

    Full Text Available Refiere el texto un resumen y análisis del libro "Entre el Saber y el Poder: Pensamiento comunicacional Latinoamericano". Libro de notable ejercicio de reflexión, de visión holística y totalizadora que recupera y sistematiza lo que se ha pensado sobre la comunicación y sus correspondientes dilemas en la América hispano-lusitana. La primera parte "la comunicación en las tramas del poder": con dos secciones, la una dedicada a la coyuntura de la Guerra Fría y la segunda dedicada a la coyuntura de la Globalización. La segunda "La comunicación en el umbral del saber" con dos secciones: la primera recoge materiales de la Educación para la comunicación y la otra la investigación de la comunicación.

  14. Swords and sabers during the Early Islamic Period

    Directory of Open Access Journals (Sweden)

    Alexander, David

    2001-12-01

    Full Text Available The present article offers a discussion on early swords and sabers during the Early Islamic Period, from the Topkap’ Sarayi collection to written, iconographic and archeological sources.

    El presente art’culo trata las espadas y sables utilizados en los primeros tiempos del Islam a partir de la colecció—n del Topkap’ Sarayi y de las fuentes escritas, iconogr‡ficas y arqueol—gicas.

  15. Commentary: Warring ants

    Indian Academy of Sciences (India)

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

  16. Antílope

    Directory of Open Access Journals (Sweden)

    Pedro Anderson Martinho Moçambique

    2015-10-01

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

  17. Antílope

    Directory of Open Access Journals (Sweden)

    Pedro Anderson Martinho Moçambique

    2011-04-01

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

  18. Fire Ant Allergy

    Science.gov (United States)

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

  19. "Ant-egg" cataract revisited

    DEFF Research Database (Denmark)

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

    2017-01-01

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

  20. 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

  1. Ten Facts Every Parent Should Know about the No Child Left Behind Act = Diez datos que cada padre debe saber sobre La Ley. Que Ningun Nino Se Quede Atras.

    Science.gov (United States)

    Department of Education, Washington, DC.

    The No Child Left Behind Act (NCLB) is President George W. Bush's education reform law passed by Republicans and Democrats in Congress. This flier, in both English and Spanish, details 10 facts concerning NCLB to inform parents as to the goals of the Act and how they will affect their child's school. The flier highlights how the Act: (1) gives…

  2. A EXPERIÊNCIA DE CONCILIAÇÃO DOS SABERES PRODUZIDOS EM SITUAÇÃO DE TRABALHO COM OS SABERES PRODUZIDOS NA ACADEMIA: O CURSO CEF-PROFAE/UFMG

    OpenAIRE

    Schwartz, Yves; Silva, Jurandir Soares da

    2010-01-01

    A pesquisa se desenvolve no departamento de Ergologia da Universidade de Aix-En-Provence e está em fase de finalização. A questão principal é compreender a forma como as trabalhadoras-alunas atendentes de enfermagem do CEFPROFAE/CP-FaE-UFMG, interrogaram e combinaram os saberes disciplinares e os saberes desenvolvidos nas atividades. Saberes estes construídos em situação de trabalho e em outros espaços de socialização (saberes em aderência) com os saberes acadêmicos (saberes em desaderência)....

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

    DEFF Research Database (Denmark)

    Doerr, Benjamin; Neumann, Frank; Sudholt, Dirk

    2011-01-01

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

  4. Aziz Nacib Ab’Saber, geógrafo brasileiro

    Directory of Open Access Journals (Sweden)

    Neli Aparecida de Mello-Théry

    2012-03-01

    Full Text Available Na ocasião do falecimento de Aziz Nacib Ab’Saber faz-se uma retrospectiva da sua carreira científica. Ela foi marcada por significativa produção científica no campo da Geografia Fisica, particularmente os estudos da paisagem e da geomorfologia. No campo da conservação da Natureza Aziz foi um pioneiro, e tornou-se um îcone dos movimentos ambientais, pela qualidade das análises e pela firmeza na defesa das posições que julgava justas.A l’occasion de la mort d’Aziz Nacib Ab’Saber le texte fait une rétrospective de sa carrière scientifique. Elle a été marquée par une importante production scientifique dans le domaine de la géographie physique, en particulier les études de paysage et la géomorphologie. Dans le domaine de la conservation de la nature Aziz a été un pionnier, et est devenu une icône du mouvement environnemental, par la qualité de ses analyses et par sa fermeté dans la défense des positions qu’il pensait justes.On the occasion of the death of Aziz Nacib Ab’Saber the text makes a retrospective of his scientific career, marked by significant scientific production in the fields of physical geography, particularly studies of landscape and geomorphology. In the field of nature conservation Aziz was a pioneer, and became an icon of the environmental movement, by the quality of its analysis and by the firmness in the defense of positions he thought justs.

  5. Saberes y poderes. Los grupos intelectuales en Colombia

    OpenAIRE

    Botero-Bernal, Andrés

    2011-01-01

    Este trabajo plantea una historia de la intelectualidad colombiana basada en ocho grandes grupos básicos, a saber: los próceres, los intelectuales gramáticos, los pedagogos y los críticos, los expertos, los intelectuales partidistas, los intelectuales filósofos, los científicos sociales y los intelectuales economistas. Esta clasificación fue hecha a partir de un esquema basado en profesiones (en especial, la del jurista, pero sin dejar de lado el militar, el médico, el economista, etc.) y en ...

  6. The metapleural gland of ants

    DEFF Research Database (Denmark)

    Yek, Sze Huei; Mueller, Ulrich G

    2011-01-01

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

  7. Hospitales seguros ante desastres

    OpenAIRE

    Celso Vladimir Bambaren Alatrista; María Del Socorro Alatrista Gutierrez

    2007-01-01

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

  8. Mesospheric Water Vapor Retrieved from SABER/TIMED Measurements

    Science.gov (United States)

    Feofilov, Arte, G.; Yankovsky, Valentine A.; Marshall, Benjamin T.; Russell, J. M., III; Pesnell, W. D.; Kutepov, Alexander A.; Goldberg, Richard A.; Gordley, Larry L.; Petelina, Svetlama; Mauilova, Rada O.; hide

    2007-01-01

    The SABER instrument on board the TIMED satellite is a limb scanning infrared radiometer designed to measure temperature and minor constituent vertical profiles and energetics parameters in the mesosphere and lower thermosphere (MLT) The H2O concentrations are retrieved from 6.3 micron band radiances. The interpretation of this radiance requires developing a non-LTE H2O model that includes energy exchange processes with the system of O3 and O2 vibrational levels populated at the daytime through a number of photoabsorption and photodissociation processes. We developed a research model base on an extended H2O non-LTE model of Manuilova coupled with the novel model of the electronic kinetics of the O2 and O3 photolysis products suggested by Yankosvky and Manuilova. The performed study of this model helped u to develop and test an optimized operational model for interpretation of SABER 6.3 micron band radiances. The sensitivity of retrievals to the parameters of the model is discussed. The H2O retrievals are compared to other measurements for different seasons and locations.

  9. Ancient DNA: Saber-Toothed Cats Are the Same Beasts After All.

    Science.gov (United States)

    Meachen, Julie A

    2017-11-06

    Ancient DNA from the saber-toothed cat Homotherium reveals that the late Pleistocene species from Europe and North America were the same. Homotherium turns out to be only distantly related to the well-known saber-toothed Smilodon. Copyright © 2017 Elsevier Ltd. All rights reserved.

  10. Familia and Comunidad-Based Saberes: Learning in an Indigenous Heritage Community

    Science.gov (United States)

    Urrieta, Luis, Jr.

    2013-01-01

    This article explores how children and youth learned indigenous heritage "saberes" (knowings) through intent community participation in Nocutzepo, Mexico. The "familia" (family) and "comunidad" (community)-based saberes were valuable for skills acquisition, but most important for learning indigenous forms of…

  11. La vivienda ante emergencias

    Directory of Open Access Journals (Sweden)

    Arq. María Eugenia Gonzàlez Chipont

    2014-12-01

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

  12. La gerencia del saber pedagógico en el ambiente universitario

    Directory of Open Access Journals (Sweden)

    Meuris Basabe

    2004-05-01

    Full Text Available El propósito del estudio es reflexionar sobre cómo gerenciar el saber pedagógico en ambientes universitarios. Se sustentó metodológicamente en un estudio teórico documental, haciendo un análisis sobre la Sociedad del conocimiento, la gerencia del conocimiento y el saber pedagógico. Como resultado se presentan algunas reflexiones que conducen a la toma de decisiones para gerenciar el saber pedagógico. Se concluye que existe la necesidad de docentes con características muy distintas a las tradicionales, que permita el análisis critico-reflexivo del saber y el hacer. Es decir, docentes que gerencien los procesos para la construcción del saber pedagógico.

  13. Wind turbine blockset in Saber. General overview and description of the models

    DEFF Research Database (Denmark)

    Iov, Florin; Timbus, Adrian Vasile; Hansen, Anca Daniela

    This report presents a new developed Saber Toolbox for wind turbine applications. This toolbox has been developed during the research project “Simulation Platform to model, optimize and design wind turbines”. The report provides a quick overview of the Saber and then explains the structure...... of this simulation package, which is different than other tools e.g. Matlab/Simulink. Then the structure of the toolbox is shown as well as the description of the developed models. The main focus here is to underline the special structure of the models, which are a mixture of Saber built-in blocks and new developed...... blocks. Since the developed models are based on Saber built-in blocks, a description of the libraries from Saber is given. Then some simulation results using the developed models are shown. Finally some general conclusions regarding this new developed Toolbox as well as some directions for future work...

  14. Wind Turbine Blockset in Saber. General Overview and Description of the Model

    DEFF Research Database (Denmark)

    Iov, Florin; Timbus, Adrian Vasile; Hansen, A. D.

    This report presents a new developed Saber Toolbox for wind turbine applications. This toolbox has been developed during the research project ?Simulation Platform to model, optimize and design wind turbines?. The report provides a quick overview of the Saber and then explains the structure...... of this simulation package, which is different than other tools e.g. Matlab/Simulink. Then the structure of the toolbox is shown as well as the description of the developed models. The main focus here is to underline the special structure of the models, which are a mixture of Saber built-in blocks and new developed...... blocks. Since the developed models are based on Saber built-in blocks, a description of the libraries from Saber is given. Then some simulation results using the developed models are shown. Finally some general conclusions regarding this new developed Toolbox as well as some directions for future work...

  15. Pest repellent properties of ant pheromones

    DEFF Research Database (Denmark)

    Offenberg, Joachim

    2012-01-01

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

  16. Hospitales seguros ante desastres

    Directory of Open Access Journals (Sweden)

    Celso Vladimir Bambaren Alatrista

    2007-07-01

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

  17. El Saber profesional de una maestra de infantil

    OpenAIRE

    Orozco Martínez, Susana

    2017-01-01

    Este artículo expone los saberes y práctica profesional de María, maestra de Educación Infantil 3 años de una escuela pública de Cataluña y a cargo 13 niñas y 11 niños. La recolección de datos posibilita profundizar en sus experiencias pedagógicas y en el proceso educativo que pone en marcha y que contribuyen en la creación y desarrollo de una relación educativa caracterizada por la atención a las necesidades individuales y a la singularidad de sus criaturas, desde un acompañamiento, acogimie...

  18. Biblioteca: espaço de saber e de poder

    Directory of Open Access Journals (Sweden)

    Keila Matida de Melo Costa

    2009-03-01

    Full Text Available Este artigo tem como objetivo apresentar um pouco da trajetória investigativade Michel Foucault na tentativa de compreender o funcionamento do poder,o modo como ele opera no espaço de uma biblioteca. O projeto Panóptico deJeremy Bentham contribui para esse entendimento. Estudo bibliográfico, análisede campo, leitura de documentos e trabalhos sobre a Biblioteca do Cefet/GOdelineiam a efetivação deste percurso. Saber, poder, controle, individualização,normalização, entre outras problematizações que caracterizam aspectos dasociedade moderna, são identificadas na constituição do espaço de leituracitado.

  19. Induced mutations in Iraqi bread wheat cv. Saber Beg

    Energy Technology Data Exchange (ETDEWEB)

    Ibrahim, I F; Haidar, H O [Department of Plant Protection, Faculty of Agriculture and Biology, NRC and Agriculture Research Station, Telafor (Iraq)

    1989-07-01

    ''Saber Beg'', is a local wheat cultivar important in the semi-arid zone of Iraq where the rainfall is less than 450 mm per year. This cultivar has a good baking quality, but is of low productivity, high susceptibility to common bunt (Tilletia spp.) and to leaf rust (Puccinia recondita Rob. ex Desm.), but only in the rainy season. A mutation breeding programme using gamma irradiation has been started in 1978 to improve this cultivar. Seeds of all main tillers from M{sub 1} plants were harvested and artificially inoculated with teliospores of Tilletia spp. All the seeds from healthy M{sub 2} plants were inoculated again and sown in the same area. Out of 22920 M{sub 3} plants, 244 resistant ones were selected. During subsequent screening for 4 generations, however, only 3 mutants were confirmed.

  20. Saúde mental: reconstruindo saberes em enfermagem

    Directory of Open Access Journals (Sweden)

    Francisca Bezerra de Oliveira

    2003-02-01

    Full Text Available O manicômio, apesar de criticado, reformado ou mesmo negado, ainda é uma prática preponderante no cuidado às pessoas com transtornos mentais. Tal prática tem como princípio básico o isolamento do doente mental, contrariando todas as possibilidades de assistência centrada num humanismo ético. Este ensaio procura interpretar a institucionalização do asilo, da psiquiatria, da doença mental e o processo da reforma psiquiátrica, buscando contribuir para as reflexões acerca da desinstitucionalização e dos saberes e práticas de enfermagem em saúde mental.

  1. Induced mutations in Iraqi bread wheat cv. Saber Beg

    International Nuclear Information System (INIS)

    Ibrahim, I.F.; Haidar, H.O.

    1989-01-01

    ''Saber Beg'', is a local wheat cultivar important in the semi-arid zone of Iraq where the rainfall is less than 450 mm per year. This cultivar has a good baking quality, but is of low productivity, high susceptibility to common bunt (Tilletia spp.) and to leaf rust (Puccinia recondita Rob. ex Desm.), but only in the rainy season. A mutation breeding programme using gamma irradiation has been started in 1978 to improve this cultivar. Seeds of all main tillers from M 1 plants were harvested and artificially inoculated with teliospores of Tilletia spp. All the seeds from healthy M 2 plants were inoculated again and sown in the same area. Out of 22920 M 3 plants, 244 resistant ones were selected. During subsequent screening for 4 generations, however, only 3 mutants were confirmed

  2. Stratospheric Temperature Trends Observed by TIMED/SABER

    Science.gov (United States)

    Xian, T.; Tan, R.

    2017-12-01

    Trends in the stratospheric temperature are studied based on the temperature profile observation from the Sounding of the Atmosphere using Broadband Emission Radiometry (SABER). The spatially trends are evaluated in different time scales ranging from decadal to monthly resolved. The results indicate a signature of BDC acceleration. There are strong warming trends (up to 9 K/decade) in the middle to upper stratosphere in the high latitude spring, summer, and autumn seasons, accompanied by strong cooling trends in the lower stratosphere. Besides, strong warming trends occurs through the whole stratosphere over the Southern Hemisphere, which confirms Antarctic ozone layer healing since 2000. In addition, the results demonstrate a significant warming trends in the middle of tropical stratosphere, which becomes strongest during June-July-August.

  3. Os mercados, os seus saberes e as suas incertezas

    Directory of Open Access Journals (Sweden)

    João Caraça

    2012-10-01

    Full Text Available A globalização, tal qual a conhecemos, não resolve os problemas, nem equaciona as questões, do viver em conjunto sobre a Terra. No contexto actual, a luta pela democracia assume, assim, três vectores essenciais: a reinvenção do poder emancipador do conhecimento, com mais e melhores ciências, ciências sociais e outros saberes argumentativos; a reintrodução da escola como o local privilegiado da aprendizagem para a cidadania plena; a instalação e defesa de uma sociedade do reconhecimento, em que a valorização do outro como interlocutor corresponda ao pulsar planetário da nossa espécie.

  4. Bigger helpers in the ant Cataglyphis bombycina: increased worker polymorphism or novel soldier caste?

    Directory of Open Access Journals (Sweden)

    Mathieu Molet

    Full Text Available The mechanisms by which development favors or constrains the evolution of new phenotypes are incompletely understood. Polyphenic species may benefit from developmental plasticity not only regarding ecological advantages, but also potential for evolutionary diversification. For instance, the repeated evolution of novel castes in ants may have been facilitated by the existence of alternative queen and worker castes and their respective developmental programs.Cataglyphis bombycina is exceptional in its genus because winged queens and size-polymorphic workers occur together with bigger individuals having saber-shaped mandibles. We measured seven body parts in more than 150 individuals to perform a morphometric analysis and assess the developmental origin of this novel phenotype.Adults with saber-shaped mandibles differ from both workers and queens regarding the size of most body parts. Their relative growth rates are identical to workers for some pairs of body parts, and identical to queens for other pairs of body parts; critical sizes differ in all cases.Big individuals are a third caste, i.e. soldiers, not major workers. Novel traits such as elongated mandibles are combined with a mix of queen and worker growth rates. We also reveal the existence of a dimorphism in the queen caste (microgynes and macrogynes. We discuss how novel phenotypes can evolve more readily in the context of an existing polyphenism. Both morphological traits and growth rules from existing queen and worker castes can be recombined, hence mosaic phenotypes are more likely to be viable. In C. bombycina, such a mosaic phenotype appears to function both for defense (saber-shaped mandibles and fat storage (big abdomen. Recycling of developmental programs may have contributed to the morphological diversity and ecological success of ants.

  5. A cellular automata model for ant trails

    Indian Academy of Sciences (India)

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

  6. ANT, tourism and situated globality

    DEFF Research Database (Denmark)

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

    2015-01-01

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

  7. Ants Orase kultuurisõnum

    Index Scriptorium Estoniae

    2007-01-01

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

  8. Saber lo que sabe el otro, saber qué sabe el otro: nota sobre la estructura del tiempo lógico en Lacan y en el acontecimiento didáctico/To know that the other knows, to know what the other knows: note on the structure of the logical time in Lacan and the didactic event

    Directory of Open Access Journals (Sweden)

    Mauricio Golfarini

    2007-01-01

    Full Text Available La Teoría del Acontecimiento Didáctico (TAcDi toma elementos de la transposición didáctica de Chevallard, específicamente su noción de cronogénesis, y los reinterpreta a partir de la concepción de temporalidad del psicoanálisis lacaniano. De tal manera, la naturaleza compleja del tiempo lógico permite encontrar aspectos poco explorados en el despliegue temporal del fenómeno didáctico, como el papel de las escansiones o mociones suspendidas. En el presente trabajo se revisa algunos aspectos importantes del tiempo lógico en la TAcDi, a la vez que se plantea un modo adicional de concebir los estadios escansivos en su relación con el saber (supuesto saber del enseñante y el no-saber del enseñado dentro de la ficción didáctica. The Theory of Didactic Event takes elements from the didactic transposition of Chevallard, specifically its notion of chronogenesis, and re-interprets it from the conception of temporality of the lacanian psychoanalysis. In such way, the complex nature of the logical time allows to find unexplored aspects in the temporary unfolding of the didactic phenomenon like the role of the scansions or suspended motions. The present work reviews some important aspects of the logical time in the Theory of the Didactic Event, and simultaneously considers an additional way to conceive the scansive stages in their relation with the knowledge of the teacher and non-knowledge of the taught one within the didactic fiction.

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

    Directory of Open Access Journals (Sweden)

    Alan Andersen

    1997-06-01

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

  10. Monoculture of leafcutter ant gardens.

    Directory of Open Access Journals (Sweden)

    Ulrich G Mueller

    2010-09-01

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

  11. Pest repelling properties of ant pheromones

    DEFF Research Database (Denmark)

    Offenberg, Joachim

    2014-01-01

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

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

    Science.gov (United States)

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

    2014-01-01

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

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

    Directory of Open Access Journals (Sweden)

    John T Longino

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

  14. La lectura en el aula. Qué se hace, qué se debe hacer y qué se puede hacer

    OpenAIRE

    Pablo Lorente Muñoz

    2011-01-01

    Emilio Sánchez Miguel (Coord.). La lectura en el aula. Qué se hace, qué se debe hacer y qué se puede hacer. Graó, col. Crítica y Fundamentos, 27. Barcelona, 2010. 382 págs. ISBN: 978-84-7827-892-3

  15. Questões de leitura e ensino: ler e saber

    Directory of Open Access Journals (Sweden)

    Guaraciaba Micheletti

    2012-12-01

    Full Text Available O ato de ler é uma atividade que conjuga a socialização em comportamentos e valores associada a processos cognitivos. Os resultados dessa atividade se estendem além dos limites da aquisição do conhecimento para uma possibilidade de integração com os outros membros da sociedade. Como uma das tarefas da escola, a leitura tem sido discutida amplamente e tem sido objeto de várias linhas de pesquisa. Alinhadas à necessidade da reflexão sobre a leitura, neste artigo, adotamos a perspectiva multidisciplinar que entrelaça os saberes e os fazeres para a formação do leitor proficiente, apontando caminhos para o desenvolvimento dessa atividade na escola, principalmente nas aulas de Língua Portuguesa, envolvendo gêneros textuais, circulação e estrutura composicional. Para esse trabalho com os variados gêneros que circulam na sociedade e na escola, fazemos algumas sugestões que podem ser ampliadas pelo professor à medida que trouxer para as atividades as necessidades dos alunos e de seu plano de ensino bem como dos documentos que se referem aos projetos da escola e às orientações nacionais. Como ilustração de desenvolvimento de um roteiro a ser elaborado para cada gênero e situação de aplicação, indicamos a leitura, seguindo essa linha, de um poema de José Paulo Paes, “Skepsis”.

  16. Saber tradicional, ética de la tierra y sustentabilidad

    Directory of Open Access Journals (Sweden)

    Heyd, Thomas

    2005-06-01

    Full Text Available This is the crucial moment to take on sustainable forms of life, and hence it is now of primary importance to adopt a land ethic that takes into account not only the use value but also the intrinsic value of the beings that make up our natural environment. In this essay I begin by focusing on the obstacles that the development of a land ethic has to face, obstacles that are due to limitations in knowledge and to mistaken assumptions. As a way to resolve these practical difficulties I first point out the existence of our natural inclinations toward the land and life. Furthermore, I propose that the traditional knowledge of those peoples that have lived for extended periods with their environments can serve us as models for the development of a culture of appreciation for the earth and its inhabitants.

    Éste ese! momento crucial para emprender formas de vida sustentables, por lo que resulta esencial adoptar una ética de la tierra que reconozca el valor intrínseco además del valor útil de los seres que pueblan nuestro medio ambiente natural. En este ensayo empiezo enfocando los obstáculos a que se enfrenta el desarrollo de una ética de la tierra, obstáculos que resultan ser el producto de conocimientos limitados y suposiciones equivocadas. En resolución de esas problemáticas prácticas apunto, primero, la existencia de inclinaciones naturales hacia la tierra y la vida. Además propongo que en el saber tradicional de los pueblos que han convivido mucho tiempo con sus espacios tenemos modelos de formas del conocer que nos pueden servir de modelo para llegar a desarrollar una cultura de aprecio de la tierra y de sus habitantes.

  17. Presentations from the Workshop On SABER: South Arc Beam Experimental Region, March 15-16, 2006, Menlo Park, California

    International Nuclear Information System (INIS)

    Noble, R.

    2006-01-01

    SABER (the South Arc Beam Experimental Region) is a proposed facility for experiments with 30 GeV electron and positron beams from the SLAC linac. The combination of a short bunch length (s z ∼ 30 microns), high beam charge (3 nC), and small focal spot size (s r = 10 microns) will offer unique scientific opportunities. For more detailed information about the SABER facility and an overview of some of the science possible take a look at the SABER proposal. Initial experiments with electrons could start as early as 2007. A central goal of SABER is to provide a facility responsive to the research needs of its users. The workshop's purposes are to introduce SABER to the potential user community and to explore the range of experiments that are possible. This is an opportunity for the research community to provide input about science at SABER and on the required beam parameters and infrastructure

  18. LA INVENCIÓN DE UN SABER METODOLÓGICO

    Directory of Open Access Journals (Sweden)

    Agustín Hernando

    2005-12-01

    Full Text Available RESUMEN:La identidad de la didáctica de la geografía, el conjunto de inquietudes y saberes que actualmente sostenemos acerca de la enseñanza y aprendizaje de la geografia, es un discurso creado, esencialmente,en el transcurso del siglo XX. Las primeras aportaciones corresponden a sus umbrales y primeras décadas siguientes. Acusan dos anhelos: el deseo de ampliar su estudio, extendiéndolo a todos los niveles o grados educativos; y su mejora denunciando unas prácticas degradantes y animando a introducir otras. El carisma de sus protagonistas, el uso de argumentos muy emotivos y la reiterada apelación a los logros conseguidos en otros países son algunas de las señas de identidad de esta primera etapa. El discurso se irá enriqueciendo y diversificando lentamente, durante las siguientes décadas, tal como acredita la literatura disponible. El configurado en las dos últimas décadas del siglo exhibe otras preocupaciones, expectativas, vocabulario y argumentos. Comparte compromisos precedentes, como el deseo de obtener mejores resultados de aprendizaje y difundir las últimas aportaciones de la geografía académica. La mayor novedad reside en su curiosidad por los complejos procesos que inspiran y guían la actividad educativa. Sus cultivadores, de forma análoga a otros especialistas, contemplan la didáctica de la geografía como un saber intelectual, metodológico, dotado de un vocabulario técnico y conceptos abstractos. En el presente ensayo tratamos de esbozar algunas de las ideas más destacadas que configuran la producción de este saber y algunos de los actores y cambios que ha registrado durante el pasado siglo. PALABRAS CLAVEDidáctica de la geografía, historia de la educación geográfica, construcción del conocimiento,ABSTRACT:The identity of the subject didáctica de la geografía was built up in a discourse that developed throughout the twentieth century. The earliest contributions corresponded to the early years and were

  19. SABER: a computational method for identifying active sites for new reactions.

    Science.gov (United States)

    Nosrati, Geoffrey R; Houk, K N

    2012-05-01

    A software suite, SABER (Selection of Active/Binding sites for Enzyme Redesign), has been developed for the analysis of atomic geometries in protein structures, using a geometric hashing algorithm (Barker and Thornton, Bioinformatics 2003;19:1644-1649). SABER is used to explore the Protein Data Bank (PDB) to locate proteins with a specific 3D arrangement of catalytic groups to identify active sites that might be redesigned to catalyze new reactions. As a proof-of-principle test, SABER was used to identify enzymes that have the same catalytic group arrangement present in o-succinyl benzoate synthase (OSBS). Among the highest-scoring scaffolds identified by the SABER search for enzymes with the same catalytic group arrangement as OSBS were L-Ala D/L-Glu epimerase (AEE) and muconate lactonizing enzyme II (MLE), both of which have been redesigned to become effective OSBS catalysts, demonstrated by experiments. Next, we used SABER to search for naturally existing active sites in the PDB with catalytic groups similar to those present in the designed Kemp elimination enzyme KE07. From over 2000 geometric matches to the KE07 active site, SABER identified 23 matches that corresponded to residues from known active sites. The best of these matches, with a 0.28 Å catalytic atom RMSD to KE07, was then redesigned to be compatible with the Kemp elimination using RosettaDesign. We also used SABER to search for potential Kemp eliminases using a theozyme predicted to provide a greater rate acceleration than the active site of KE07, and used Rosetta to create a design based on the proteins identified. Copyright © 2012 The Protein Society.

  20. PRINCIPALES COMPETENCIAS QUE DEBE POSEER UN DIRECTOR DE PROYECTOS EN LA INDUSTRIA DE LA CONSTRUCCIÓN

    Directory of Open Access Journals (Sweden)

    R. F. Herrera

    2016-12-01

    Full Text Available El rol del director de proyectos es uno de los trabajos más desafiantes en cualquier organización, porque requiere una amplia comprensión sobre varias áreas que deben estar coordinadas y sobre las que se requieren habilidades interpersonales. El objetivo del trabajo es definir las principales competencias que deben poseer los directores de proyectos en la industria de la construcción, y además presentar cómo éstos podrían desarrollarlas. Para cumplir con éste, se realizó un análisis crítico que incluye diversos estudios de expertos, e instituciones dedicadas a esta área de la ingeniería. De este estudio se concluye que el director de proyectos debe poseer conocimientos, habilidades y actitudes para manejar los aspectos técnicos específicos, el alcance, los costos, los tiempos y la interrelación, alineada con los objetivos, del equipo de trabajo y de los stakeholders, entre otros. Todo ello en un ambiente cambiante, diverso y transversal, generador de incertidumbre y de conflictos a solucionar de forma competente. The role of the project manager is one of the most challenging jobs in any organization because it requires a broad understanding of several areas that need to be coordinated and require interpersonal skills. The objective of the work is to define the main competences that must be possessed by the project managers in the construction industry, and also to present how they could develop them. In order to comply with this, a critical analysis was carried out that includes several studies of experts, and institutions dedicated to this area of engineering. This study concludes that the project manager must have the knowledge, skills and attitudes to handle the specific technical aspects, scope, costs, timing and interrelationship, aligned with the objectives, teamwork and stakeholders, among others. All this in a changing, diverse and transversal environment, generating uncertainty and conflicts to be resolved competently

  1. Kinetic Temperature and Carbon Dioxide from Broadband Infrared Limb Emission Measurements Taken from the TIMED/SABER Instrument

    Science.gov (United States)

    Mertens, Christopher J.; Russell III, James M.; Mlynczak, Martin G.; She, Chiao-Yao; Schmidlin, Francis J.; Goldberg, Richard A.; Lopez-Puertas, Manuel; Wintersteiner, Peter P.; Picard, Richard H.; Winick, Jeremy R.; hide

    2008-01-01

    The Sounding of the Atmosphere using Broadband Emission Radiometry (SABER) experiment is one of four instruments on NASA's Thermosphere-Ionosphere-Energetics and Dynamics (TIMED) satellite. SABER measures broadband infrared limb emission and derives vertical profiles of kinetic temperature (Tk) from the lower stratosphere to approximately 120 km, and vertical profiles of carbon dioxide (CO2) volume mixing ratio (vmr) from approximately 70 km to 120 km. In this paper we report on SABER Tk/CO2 data in the mesosphere and lower thermosphere (MLT) region from the version 1.06 dataset. The continuous SABER measurements provide an excellent dataset to understand the evolution and mechanisms responsible for the global two-level structure of the mesopause altitude. SABER MLT Tk comparisons with ground-based sodium lidar and rocket falling sphere Tk measurements are generally in good agreement. However, SABER CO2 data differs significantly from TIME-GCM model simulations. Indirect CO2 validation through SABER-lidar MLT Tk comparisons and SABER-radiation transfer comparisons of nighttime 4.3 micron limb emission suggest the SABER-derived CO2 data is a better representation of the true atmospheric MLT CO2 abundance compared to model simulations of CO2 vmr.

  2. Male parentage in army ants

    DEFF Research Database (Denmark)

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

    2006-01-01

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

  3. A cellular automata model for ant trails

    Indian Academy of Sciences (India)

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

  4. Fungal Adaptations to Mutualistic Life with Ants

    DEFF Research Database (Denmark)

    Kooij, Pepijn Wilhelmus

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

  5. Ángulos planos: Por qué el radián debe tener una medida igual a la unidad?

    Directory of Open Access Journals (Sweden)

    Héctor Oscar Di Rocco

    2009-05-01

    Full Text Available http://dx.doi.org/10.5007/2175-7941.2009v26n1p136 En este artículo se trata de un asunto que genera polémicas en la enseñanza de la Física: por qué el radián debe tener asignada una medida igual a la unidad. El radián no es una de las tantas posibles unidades de ángulos, sino la única para la cual se cumplen las relaciones trigonométricas y del Cálculo Infinitesimal, aunque la Geometría Analítica no necesite de esta unidad. Se muestra que la respuesta debe buscarse en algunos sencillos conceptos del Cálculo Infinitesimal, donde las nociones analíticas se hacen independientes de las geométricas.

  6. Microsatellite Primers for Fungus-Growing Ants

    DEFF Research Database (Denmark)

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

    2002-01-01

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

  7. Microsatellite primers for fungus-growing ants

    DEFF Research Database (Denmark)

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

    2002-01-01

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

  8. Saber-sheath trachea as a marker of severe airflow obstruction in chronic obstructive pulmonary disease.

    Science.gov (United States)

    Ciccarese, Federica; Poerio, Antonio; Stagni, Silvia; Attinà, Domenico; Fasano, Luca; Carbonara, Paolo; Bacchi Reggiani, Maria Letizia; Zompatori, Maurizio

    2014-02-01

    Saber-sheath trachea is a specific radiographic parameter for chronic obstructive pulmonary disease (COPD), which consists of marked coronal narrowing associated with sagittal widening (tracheal index saber-sheath trachea and clinical-radiological findings in a group of patients with COPD of varying severity. We evaluated the chest radiographs of 71 patients with COPD distributed as follows: GOLD class I, 8/71 (11.3 %); class II, 34/71 (47.9 %); class III, 16/71(22.5 %); class IV, 13/71 (18.3 %). In 52/71 (73.2 %) patients we also evaluated chest computed tomography (CT) scans. We analyzed the prevalence of saber-sheath trachea and its correlation with the Tiffenau index, GOLD stage and radiological signs of COPD. Moreover, we evaluated the sensitivity, specificity and accuracy of chest radiography as compared to CT taken as the gold standard, and the correlation between the radiographic and CT tracheal index. Saber-sheath trachea was found in 18/71 (25.4 %) patients, with a greater prevalence in patients with lower Tiffenau Index (p = 0.02), GOLD stages III-IV and visual severity score 3 (severe) on chest CT. Saber-sheath trachea was not found to be related to other radiological signs of COPD. The sensitivity, specificity and accuracy values of radiography were 72.2, 97.0 and 88.5 %, with perfect concordance between the radiographic and CT tracheal index (p Saber-sheath trachea is linked to the functional severity of airway obstruction, but not to other radiological signs of COPD. Thus, evaluation of the trachea at chest radiography is strongly recommended.

  9. Argumentative skills of law students in the framework of the Saber-Pro tests

    Directory of Open Access Journals (Sweden)

    Rafael Alejandro Betancourt Durango

    2015-06-01

    Full Text Available In the context of university training of lawyers, argumentative skills are vital for the outstanding performance of these professionals in their work environment; so the State sphere has tended to design, collecting the Saber-Pro test model, generic and specific evaluation components that support the appropriation of reading and writing and literacy skills in law students who face the State exam. In this research paper it is intended to inform the academic community about the indicators of performance on Saber-Pro tests, reflected by the students attached to the Law Program at Institución Universitaria de Envigado, seen from the analysis of argumentative skills

  10. Saberes mapuche en la relación del hombre con la naturaleza: aportes para

    Directory of Open Access Journals (Sweden)

    Carlos Manuel Pacheco Huaiquifil

    2015-12-01

    Full Text Available El presente artículo tiene como objetivo elaborar una propuesta educativa de educación ambiental basada en los saberes ancestrales mapuche relacionados con el cuidado medioambiental.El estudio de tipo cualitativo,utiliza la Teoría Fundamentada. Se aplicaron 12 entrevistas a personas con ascendencia mapuche y que vive no han vivido en comunidades mapuche o sectores rurales. Los resultados identifican un con junto de conocimientos de cuidado y daño medioambiental y estrategias de enseñanza que permiten diseñar una propuesta de educación ambiental basada en estos saberes.

  11. El saber florilégico de Bizancio

    Directory of Open Access Journals (Sweden)

    Tomás Fernández

    2017-08-01

    Full Text Available Resumen Esta contribución se propone ofrecer un brevísimo panorama de los cambios en la disposición y estructura de los florilegios griegos entre los siglos V y X. Está organizada en torno a tipos de antología, siguiendo laxamente una línea cronológica: 1. El florilegio erudito de Estobeo y el moral de Antíoco; 2. Los florilegios dogmáticos; 3. Los florilegios espirituales; 4. Los gnomologios y florilegios sacro-profanos; 5. Concluye con una referencia a la relación entre antologías y enciclopedismo bizantino. Palabras clave: Bizancio; antologías; gnomologios; enciclopedismo bizantino Abstract This article aims at giving a very short overview about changes in disposition and structure of Greek florilegia between the 5th and 10th centuries. lt is organised following the type of anthology, following also a rough chronological orden: 1. The erudite florilegium of Stobaeus and the moral one of Antiochus; 2. Dogmatic florilegia; 3. Spiritual florilegia; 4. Gnomologia and sacro-profane florilegia; 5. Brief conclusion about the relation between anthologies and Byzantine encyclopaedism. Keywords: Byzantium; anthologies; gnomologia; Byzantine encyclopaedism

  12. Saber arte para saber enseñar arte_la formación de los maestros de educación artística

    Directory of Open Access Journals (Sweden)

    Lucia Gouvêa Pimentel

    2009-04-01

    Full Text Available Para saber enseñar arte es necesario que el maestro de Educación Artística tenga conocimiento suficiente para que pueda escoger los contenidos y las metodologías más adecuadas al aprendizaje. Es importante dar a los maestros de Educación Artística la formación y condiciones adecuadas para que se tornen sujetos pensantes de su contexto y de sus acciones.

  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. Una mirada sobre la educación superior mexicana: instituciones, saberes y mercado

    Directory of Open Access Journals (Sweden)

    Philippe Dautrey

    2013-02-01

    Full Text Available Después de un largo proceso en el que reivindicó su protagonismo en materia de educación, el Estado mexicano llegó a afianzar su papel educador en el nivel superior, en realidad consolidado a raíz de la revolución de 1910. No obstante, ante el crecimiento de la demanda educativa a partir de los años setenta y de la crisis económica de la década de los ochenta, recurrió al mercado quedándose con la rectoría del sistema de educación. La consiguiente extensión del sector privado de nivel superior, que creció más rápido que las universidades públicas, llevó sin embargo a una mayor estratificación de los establecimientos y el acceso a ellos se tornó desigual. Así, las élites se desplazaron del sector público hacia las instituciones privadas de prestigio. El auge de la educación superior particular condujo también a la mercantilización y a la desvalorización de los saberes mientras perduró la tradicional orientación a la enseñanza profesional (como consecuencia, la creciente investigación se quedó casi exclusivamente en el ámbito público. En conclusión, la irrupción de la competencia en el nivel superior no mejoró la calidad de la educación sino que contribuyó a la constitución de un sector educativo precario mediocre que ni siquiera garantiza una segura inserción laboral. English: Following a long struggle to establish its authority over education, the Mexican government finally managed to take control of higher education in the aftermath of the 1910 revolution. However, faced with a growing demand for education since the 1970s and an economic crisis in the 1980s, it had no alternative but to turn to the market, retaining only its normative function in the process. The rapid expansion of private institutions, fast outnumbering public universities, has led to a much more pronounced stratification of higher education schools and made access unequal. One consequence is that the elite have shifted from public to

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

    Science.gov (United States)

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

    2017-12-01

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

  16. Ecosystem services delivered by weaver ants

    DEFF Research Database (Denmark)

    Offenberg, Joachim

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

  17. Roadside Survey of Ants on Oahu, Hawaii

    Science.gov (United States)

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

    2018-01-01

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

  18. Spectral wave analysis at the mesopause from SCIAMACHY airglow data compared to SABER temperature spectra

    Directory of Open Access Journals (Sweden)

    M. Ern

    2009-01-01

    Full Text Available Space-time spectral analysis of satellite data is an important method to derive a synoptic picture of the atmosphere from measurements sampled asynoptically by satellite instruments. In addition, it serves as a powerful tool to identify and separate different wave modes in the atmospheric data. In our work we present space-time spectral analyses of chemical heating rates derived from Scanning Imaging Absorption SpectroMeter for Atmospheric CHartographY (SCIAMACHY hydroxyl nightglow emission measurements onboard Envisat for the years 2002–2006 at mesopause heights. Since SCIAMACHY nightglow hydroxyl emission measurements are restricted to the ascending (nighttime part of the satellite orbit, our analysis also includes temperature spectra derived from 15 μm CO2 emissions measured by the Sounding of the Atmosphere using Broadband Emission Radiometry (SABER instrument. SABER offers better temporal and spatial coverage (daytime and night-time values of temperature and a more regular sampling grid. Therefore SABER spectra also contain information about higher frequency waves. Comparison of SCIAMACHY and SABER results shows that SCIAMACHY, in spite of its observational restrictions, provides valuable information on most of the wave modes present in the mesopause region. The main differences between wave spectra obtained from these sensors can be attributed to the differences in their sampling patterns.

  19. Spectral wave analysis at the mesopause from SCIAMACHY airglow data compared to SABER temperature spectra

    Directory of Open Access Journals (Sweden)

    M. Ern

    2009-01-01

    Full Text Available Space-time spectral analysis of satellite data is an important method to derive a synoptic picture of the atmosphere from measurements sampled asynoptically by satellite instruments. In addition, it serves as a powerful tool to identify and separate different wave modes in the atmospheric data. In our work we present space-time spectral analyses of chemical heating rates derived from Scanning Imaging Absorption SpectroMeter for Atmospheric CHartographY (SCIAMACHY hydroxyl nightglow emission measurements onboard Envisat for the years 2002–2006 at mesopause heights.

    Since SCIAMACHY nightglow hydroxyl emission measurements are restricted to the ascending (nighttime part of the satellite orbit, our analysis also includes temperature spectra derived from 15 μm CO2 emissions measured by the Sounding of the Atmosphere using Broadband Emission Radiometry (SABER instrument. SABER offers better temporal and spatial coverage (daytime and night-time values of temperature and a more regular sampling grid. Therefore SABER spectra also contain information about higher frequency waves.

    Comparison of SCIAMACHY and SABER results shows that SCIAMACHY, in spite of its observational restrictions, provides valuable information on most of the wave modes present in the mesopause region. The main differences between wave spectra obtained from these sensors can be attributed to the differences in their sampling patterns.

  20. Republic of Kiribati Early Childhood Development : SABER and NSA-ECD Country Report 2014

    OpenAIRE

    World Bank Group

    2014-01-01

    This report presents an analysis of the Early Childhood Development (ECD) subsector, including programs and policies that affect young children in the Republic of Kiribati. This was a collaborative effort between UNICEF and the World Bank Group; it combines the World Bank Group’s Systems Approach for Better Education Results SABER-ECD framework, which includes analysis of early learningan...

  1. Chapter 7: Lessons, Conclusions, and Implications of the Saber-Tooth Project.

    Science.gov (United States)

    Ward, Phillip; Doutis, Panayiotis; Evans, Sharon A.

    1999-01-01

    Summarizes findings from the Saber-Tooth Project related to systemic change and student learning, concluding that vision is everything; workplace conditions must be addressed at multiple levels; strong relationships exist among planning, teaching, and assessment; and improvement in reform may occur due to the cessation of business as usual. This…

  2. Evolutionary History of Saber-Toothed Cats Based on Ancient Mitogenomics

    NARCIS (Netherlands)

    Paijmans, Johanna L.A.; Barnett, Ross; Gilbert, M. Thomas P.; Zepeda-Mendoza, M. Lisandra; Reumer, Jelle W.F.; de Vos, John; Zazula, Grant; Nagel, Doris; Baryshnikov, Gennady F.; Leonard, Jennifer A.; Rohland, Nadin; Westbury, Michael V.; Barlow, Axel; Hofreiter, Michael

    2017-01-01

    Saber-toothed cats (Machairodontinae) are among the most widely recognized representatives of the now largely extinct Pleistocene megafauna. However, many aspects of their ecology, evolution, and extinction remain uncertain. Although ancient-DNA studies have led to huge advances in our knowledge of

  3. Unexpected East-West effect in mesopause region SABER temperatures over El Leoncito

    Science.gov (United States)

    Reisin, Esteban R.; Scheer, Jürgen

    2017-05-01

    We find that mesopause region temperatures determined by the SABER instrument on the TIMED satellite during nocturnal overpasses at El Leoncito (31.8°S, 69.3°W) are several kelvins higher when SABER observes from the East than when it observes from the West. We distinguish between altitudes corresponding to the nominal emission heights of the OH and O2 airglow layers. The East-West temperature differences of 4.5 K obtained for OH-equivalent height, and of 3.5 K for O2-equivalent height are surprising, because an effect of the South Atlantic Anomaly on SABER temperature is unexpected. However, the ground-based data obtained with our airglow spectrometer at El Leoncito show that such a SABER artifact can be ruled out. Rather, the phenomenon is explained as a consequence of the temporal sampling of the nocturnal variation, which is mostly due to the semidiurnal tide. The monthly mean tide is strongest from April to September with a mean amplitude of 6.9 K for OH, and of 10.5 K for O2 rotational temperature, but the contribution to the East-West effect varies strongly from month to month because of differences in the temporal sampling. This mechanism should be active at other sites, as well.

  4. New formulations of bupivacaine for the treatment of postoperative pain: liposomal bupivacaine and SABER-Bupivacaine.

    Science.gov (United States)

    Skolnik, Aaron; Gan, Tong J

    2014-08-01

    Although generally considered both safe and effective, local anesthetics are often used in conjunction with opioids postoperatively in part because of the limited duration of drug action of local anesthetics. Much interest exists in extending the duration of local anesthetics' effects, which may reduce the requirement for opioid pain medications that are frequently associated with side effects, including nausea and vomiting, pruritus and respiratory depression. This article introduces liposomal bupivacaine and SABER®-Bupivacaine, two new formulations of bupivacaine that increase the duration of analgesia postoperatively through two novel slow-release technologies. The pharmacodynamics, pharmacokinetics, efficacy and safety of both preparations of bupivacaine are reviewed. An electronic database search conducted using the Cochrane Central Register of Controlled Trials and MEDLINE/PubMed with the following search terms: 'bupivacaine,' 'liposomal bupivacaine', 'liposome bupivacaine', 'Exparel', 'SABER-Bupivacaine', 'SABER Bupivacaine', and 'SABER' yielded 90 articles (no language or date of publication restrictions were imposed). Clinical trials involving liposomal bupivacaine and SABER-Bupivacaine indicate that both safely prolong analgesia, while decreasing opioid requirements when compared with placebo. However, additional clinical studies are necessary to better determine the efficacy and cost-effectiveness of these long-acting local anesthetic formulations.

  5. Saberes da ayahuasca e processos educativos na religião do Santo Daime

    Directory of Open Access Journals (Sweden)

    Maria Betânia B. Albuquerque

    2012-01-01

    contextos culturales, como en la religión brasileña conocida como Santo Daime. Supongo, por lo que se afirma en los propios himnos de la doctrina, que el Daime (ayahuasca es un profesor y que en la religión se experimenta un proceso educativo donde un conjunto de saberes es distribuido y aprehendido. Metodológicamente, resulta de una búsqueda bibliográfica, documental y de campo. Tiene como fuentes la bibliografía sobre religiones ayahuasqueras, los libros de himnos del Santo Daime y la realización de entrevistas con participantes (daimistas de Brasil y otros países. Teóricamente se inspira en los estudios de Carlos Rodrigues Brandão acerca de la educación como cultura y los escritos de Boaventura de Sousa Santos, restringiendo este texto a la noción de saberes ecológicos y ambientales del autor. Entre los principales saberes del daime resalto: los saberes ecológicos y ambientales, cognitivos, estéticos, medicinales y para la paz.

  6. CT saber-sheath trachea. Correlation with clinical, chest radiographic and functional findings

    International Nuclear Information System (INIS)

    Trigaux, J.P.; Hermes, G.; Dubois, P.; Beers, B. van; Delaunois, L.; Jamart, J.

    1994-01-01

    The diagnosis of saber-sheath trachea is easy at CT due to its cross-sectional imaging, but the significance of this CT sign has not been evaluated in the diagnosis of chronic obstructive pulmonary disease (COPD). Various signs of COPD were compared between a series of 20 patients with a saber-sheath trachea at CT (tracheal index ≤66%) and a group of 20 pneumologic control patients without saber-sheath trachea (tracheal index ≥70%). These signs include clinical and standard radiographic indices of COPD, sternum-spine distance and 3 functional tests of COPD: forced expiratory volume in one second, carbon monoxide diffusing lung capacity, and funtional residual capacity (FRC). A significant difference was found between the 2 groups, concerning the values of FRC and of sternum-spine distance (p -2 ). The tracheal index was significantly correlated with the FRC values and with the sternum-spine distance. No other significant difference was observed. It is concluded that saber-sheath trachea is basically a sign of hyperinflation. (orig./MG)

  7. Saberes da ayahuasca e processos educativos na religião do Santo Daime

    Directory of Open Access Journals (Sweden)

    Maria Betânia B. Albuquerque

    2012-05-01

    Full Text Available Este estudo volta-se para os saberes da ayahuasca, beberagem de origem indígenafeita da combinação de um cipó e as folhas de um arbusto da Amazônia, utilizada em diferentescontextos culturais como é o caso da religião brasileira conhecida como Santo Daime. Parto dopressuposto, afirmado nos próprios hinos da doutrina, de que o daime (ayahuasca é um professore que na religião vivencia-se um processo educativo no qual um conjunto de saberes é circulado eapreendido. Metodologicamente, resulta de uma pesquisa bibliográfica, documental e de campo.Têm como fontes a bibliografia sobre as religiões ayahuasqueiras, os cadernos de hinos do SantoDaime e a realização de entrevistas com daimistas do Brasil e outros países. Teoricamente, inspirasenos estudos de Carlos Rodrigues Brandão acerca da educação como cultura e nos escritos deBoaventura de Sousa Santos, restringindo este texto à noção de “ecologia de saberes” deste autor.Dentre os principais saberes do daime destaco: saberes ecológicos-ambientais, cognitivos, estéticos,medicinais, e para a paz.

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

    Directory of Open Access Journals (Sweden)

    James M. Cook

    2012-02-01

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

  9. Long-range downstream effects of urban runoff and acid mine drainage in the Debed River, Armenia: insights from lead isotope modeling

    International Nuclear Information System (INIS)

    Kurkjian, Robert; Dunlap, Charles; Flegal, A. Russell

    2004-01-01

    Lead concentrations and isotopic compositions measured along 80 km of the Debed River in the Republic of Armenia provide new insights into the geochemical and physical controls on riparian Pb transport by allowing comparison of the long-range, downstream impacts of acid mine drainage with runoff from an industrialized city. The modern background Pb concentration in Armenian surface waters is estimated to be ∼0.01 μg/L, based on analyses of remote alpine rivers in Armenia. The lead concentration in the Debed River is 8 μg/L (800 times background) after passing through Vanadzor, the second largest industrial city in Armenia; it then decreases to 1 μg/L before the Debed River flows into the Alaverdi mining district. There, the Debed River receives waters from two mining drainage streams with Pb concentrations >3000 μg/L, but those concentrations decrease 3 orders of magnitude to ∼3 μg/L by the time the river exits Armenia and flows into the Republic of Georgia. Isotope mixing plots show shifts in Pb isotope composition as the river flows out of Vanadzor, evidencing the mixture of an average terrestrial Pb composition ( 206 Pb/ 207 Pb ∼ 1.17; 208 Pb/ 207 Pb ∼ 2.45) with past leaded gasoline and other industrial Pb emissions retained in the river's sediments within that region ( 208 Pb/ 207 Pb ≤ 2.45). The isotopic composition again shifts (e.g., 208 Pb/ 207 Pb ≥ 2.46) as the river passes through the Alaverdi mining district, where isotopic ratios in the water are characteristic of Pb in the area's massive sulfide deposits. Modeling both downstream elemental concentrations and Pb isotopic compositions further resolves the physical and chemical behavior of the contaminants in the river system. A multi-element model of concentration gradients in the acid mine drainage streams indicates Pb is attenuated by Al(OH) 3 precipitation (54% of the loss) and by adsorption onto other particles settling out of the water column (46% of the loss). Modeling of Pb

  10. The distribution and diversity of insular ants

    DEFF Research Database (Denmark)

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

    2016-01-01

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

  11. The State of the Thermosphere in 2017 as Observed by SABER

    Science.gov (United States)

    Hunt, L. A.; Mlynczak, M. G.; Marshall, B. T.; Russell, J. M., III

    2017-12-01

    Infrared radiative cooling of the thermosphere by carbon dioxide (CO2, 15 μm) and by nitric oxide (NO, 5.3 μm) has been observed for nearly 16 years by the Sounding of the Atmosphere using Broadband Emission Radiometry (SABER) instrument on the NASA Thermosphere-Ionosphere-Mesosphere Energetics and Dynamics (TIMED) satellite. SABER has documented dramatic variability in the radiative cooling on timescales ranging from days to the nominal 11-year solar cycle, providing important information about the radiation budget in the upper atmosphere. The effects of Solar Cycle 24 are clearly evident in the infrared radiative cooling of the thermosphere as observed by SABER. The peak NO cooling in SC24 is about one-third less than the maximum seen in SC23 since the beginning of the SABER record in January 2002, while the SC24 CO2 peak is nearly 95% of that in SC23. SC24 has been weakening throughout all of 2017 as measured by the F10.7 index and the sunspot number. Despite this, the radiative cooling by NO and CO2 has not yet reached the low levels of the prior minimum in 2008-2009. This is due to continuing elevated levels of geomagnetic activity as clearly shown by the Ap index. During the years preceding the prior solar minimum, harmonics of the solar rotation period were evident in time series of the NO and CO2 power, and were associated with high speed solar wind streams emanating from coronal holes roughly evenly spaced in solar longitude. Despite a number of large, Earth-facing coronal holes in 2017, periodic features have not yet been observed in spectral/Fourier analysis of the SABER radiative cooling time series. Additional comparisons between solar cycles and with other solar and geomagnetic indicators will also be shown.

  12. Antígona y la muerte

    OpenAIRE

    Pérez Alcolea, Simona Micaela

    2012-01-01

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

  13. Ant-plant symbioses: Stalking the chuyachaqui.

    Science.gov (United States)

    Davidson, D W; McKey, D

    1993-09-01

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

  14. From Ant Trails to Pedestrian Dynamics

    Directory of Open Access Journals (Sweden)

    Andreas Schadschneider

    2003-01-01

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

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

    Science.gov (United States)

    de Vega, Clara; Herrera, Carlos M

    2013-04-01

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

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

    African Journals Online (AJOL)

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

  17. Michael Jackson antes del caos

    OpenAIRE

    Juan Luciano Nieves

    2015-01-01

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

  18. Viaje Antártico

    OpenAIRE

    Lasa, Gorka

    2017-01-01

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

  19. Aprender a través de la escritura. los diarios de prácticas y el desarrollo de saberes experienciales

    Directory of Open Access Journals (Sweden)

    Ester Caparrós Martín

    2017-07-01

    Full Text Available En este artículo presentamos una experiencia de asesoramiento a estudiantes de las asignaturas de Practicum, en las titulaciones de Educación Social (Universidades de Málaga y Almería y Educación Infantil (Universidad de Valencia. El sentido con el que hemos pensado y conducido esta práctica de asesoramiento, descansa en nuestra concepción del oficio educativo como un oficio personal. Esto significa, necesariamente, revisar los conocimientos teóricos de los que habitualmente nos valemos en la formación inicial, tendiendo a promover el desarrollo de saberes experienciales. A su vez, este planteamiento se sostiene desde la necesidad de contemplar la educación como experiencia, de manera que la formación inicial debe poder aspirar a desarrollar en las y los estudiantes aquellas disposiciones necesarias para pensar sobre si mismos en relación con lo vivido desde una actitud pedagógica reflexiva. En el artículo exponemos el uso de los diarios de prácticas, centrándonos en las posibilidades epistemológicas y formativas de la escritura. Nos detenemos en la narración de la experiencia didáctica desarrollada, analizando los entresijos del acompañamiento que hemos prestado a los estudiantes. El artículo finaliza con una serie de hallazgos que, formulados como tensiones, expresan las dificultades a las que nuestros estudiantes se enfrentan en relación a la escritura, relativas a, entre otras cuestiones: la tendencia a realizar una escritura plana (con poca profundidad, la dificultad para aceptar la incertidumbre a la que se enfrentan, las prisas por zanjar las situaciones vividas, o el enorme problema profesional de pensarse en la relación con el otro.

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

    DEFF Research Database (Denmark)

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

    2018-01-01

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

  1. Saber popular: sua existência no meio universitário Saber popular: su existencia en el medio universitario Popular wisdom: its existence in the university environment

    Directory of Open Access Journals (Sweden)

    Maria Alves Barbosa

    2004-12-01

    Full Text Available Mitos e crendices estão presentes hodiernamente, apesar do desenvolvimento da ciência e da tecnologia, principalmente na busca por soluções de problemas que fogem ao entendimento humano. Objetivou-se verificar na comunidade universitária a existência de crendices e mitos, investigando suas origens, influências, adoção e credibilidade, correlacionando-os com o nível de conhecimento dos indivíduos. Pesquisa descritivo-analítica desenvolvida em Unidades de Ensino da Área de Saúde da Universidade Federal de Goiás. Seguiu-se a técnica de análise de conteúdo para análise dos dados. Foram criadas duas categorias: Atitudes Pessoais Relacionadas a Crenças e Influências e Superação das Crenças. Concluiu-se que há colisão entre os saberes popular e científico, gerando a exclusão do saber popular, sua manutenção "velada", ou mesmo, a aliança dos saberes.Mitos y creencias están presentes actualmente, a pesar del desarrollo de la ciencia y de la tecnología, principalmente en la búsqueda por soluciones de problemas que escapan al entendimiento humano. El estudio tuvo como objetivo verificar en la comunidad universitaria la existencia de creencias, mitos y otras prácticas populares, investigando sus orígenes, influencias, adopción, credibilidad y correlacionándolos con el nivel de conocimiento de los individuos. La investigación cuya naturaleza es descriptiva-analítica, fue desarrollada en Unidades de Enseñanza del Área de Salud de la Universidad Federal de Goiás. El grupo se constituye de profesores y estudiantes de los cursos del área de salud. Los resultados posibilitaron la creación de dos categorías, la primera, Actitudes personales relacionadas a Creencias, evidenció el poder de las prácticas populares y de las creencias sobre el comportamiento humano y la segunda, Influencias y Superación de las Creencias, permitió la comprensión del contento social y cultural del grupo investigado. Se concluye que

  2. The evolution of genome size in ants

    Directory of Open Access Journals (Sweden)

    Spagna Joseph C

    2008-02-01

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

  3. Hybrid chaotic ant swarm optimization

    International Nuclear Information System (INIS)

    Li Yuying; Wen Qiaoyan; Li Lixiang; Peng Haipeng

    2009-01-01

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

  4. Una lectura teológica de la realidad: ¿A cuáles nuevos saberes recurrir o con qué saberes contar?

    Directory of Open Access Journals (Sweden)

    Geraldo De Mori

    2012-01-01

    Full Text Available Tras un breve recurrido histórico del lugar de los otros saberes en la teología práctica/pastoral, el presente artículo hace un análisis de cómo estos saberes se encuentran hoy día en los principales modelos de teología práctica/pastoral, a saber: 1 las teologías prácticas empíricas, más presentes en los países anglosajones, que dialogan mucho con la sicología y la pedagogía; 2 las teologías prácticas críticas, como son las teologías política y de la liberación, que hacen de la praxis la categoría central del quehacer teológico y entran en un diálogo estrecho sobre todo con la sociología, la economía y las ciencias políticas; 3 las teologías prácticas/pastorales fundamentales, propuesta por Browning, que intentan dialogar sobre todo con la filosofía hermenéutica. En un tercer momento, partiendo de tres categorías de la ética de Paul Ricoeur, es decir, la estima de sí, el cuidado el otro y la búsqueda de instituciones justas, el texto propone pensar el quehacer de la teología práctica/ pastoral alrededor de esas categorías, mostrando a qué saberes recurrir.After a brief historical review of the role of other knowledges in practical/pastoral theology, this article analyzes how these knowledges are found today in the main models of practical/pastoral theology, namely: 1 empirical practical theologies, more present in Anglo-Saxon countries, which are often in dialogue with psychology and pedagogy; 2 critical practical theologies, such as political and liberation theologies, which make praxis the central category of the theological task and that are in close dialogue mainly with sociology, economics and political science; 3 fundamental practical/pastoral theologies, proposed by Browning, which attempt to dialogue principally with hermeneutic philosophy. In a third stage, based on Paul Ricoeur's three ethical categories, that is to say, self-esteem, caring for others and the pursuit of just institutions, the

  5. 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.

  6. Hey! A Fire Ant Stung Me!

    Science.gov (United States)

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

  7. The Biochemical Toxin Arsenal from Ant Venoms

    Science.gov (United States)

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

    2016-01-01

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

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

    Science.gov (United States)

    Oña, L; Lachmann, M

    2011-03-01

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

  9. Responsabilidad de los contadores públicos ante ilícitos tributarios en empresas comerciales del sector ferretero del Municipio Alberto Adriani del estado Mérida

    OpenAIRE

    Almeida, Jhoner; Cote, Marilys; Briceño, María Eugenia; Rojas, Ma. Elizabeth

    2011-01-01

    La actuación del contador público está cubierta de responsabilidad y compromiso y ante esto debe actuar con rectitud y buena fe, mantener el honor, dignidad y capacidad profesional. No obstante, hay situaciones en la que los contadores incurren en actos contrarios a la norma legal, lo cual puede provocar daños a terceros o al Estado. Tal es el caso de los ilícitos tributarios que constituyen toda acción u omisión violatoria de las normas tributarias previstas en el Código Orgánico...

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

    Directory of Open Access Journals (Sweden)

    Mohammed Faisal

    2016-01-01

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

  11. Cryptococcus neoformans carried by Odontomachus bauri ants

    Directory of Open Access Journals (Sweden)

    Mariana Santos de Jesus

    2012-06-01

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

  12. Recurrence analysis of ant activity patterns.

    Directory of Open Access Journals (Sweden)

    Felipe Marcel Neves

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

  13. Ants defend aphids against lethal disease

    Science.gov (United States)

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

    2010-01-01

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

  14. Induced resistance to septorial leaf blotch disease in wheat cv. 'SaberBeg' and its hybrids by fast neutrons

    International Nuclear Information System (INIS)

    Ibrahim, I.; Al-Marooff, E.; AI-Janabi, A.; Mahmood, A.; AI-Aubaidi

    1990-01-01

    Full text: Seeds of 'SaberBeg' and its hybrids in F 2 generation were irradiated with different doses of fast neutrons. 1324 variants selected from M 2 and F 4 M 2 were evaluated for resistance to septorial leaf blotch (Septoria tritici Rob ex Desm) with artificial inoculation under field conditions, through 3 successive generations. Results revealed 55 variants moderately resistant, along with better agronomic traits such as stiff stem, earliness in maturity and good adaption to semiarid zone conditions. The highest number of such variants was obtained from irradiated 'SaberBeg' x 'Mexipak' and 'SaberBeg' x ('Mexipak' x 'AbuGhraib 4'), while the lowest number was found from 'SaberBeg' x 'Araz'. (author)

  15. Saberes ambientales lafkenche en escuelas de la costa de La Araucanía (Chile

    Directory of Open Access Journals (Sweden)

    Marcela Rojas-Maturana

    2015-01-01

    Full Text Available Este estudio es un acercamiento a la realidad de la transmisión oralde saberes y prácticas acerca del territorio, en familias lafkenche que viven asociadas a espaciosde humedales en el borde costero de La Araucanía (Chile. Para la recolección de datos aplicamosencuestas a niños y niñas, padres y madres, docentes, y asesores y asesoras culturales en cincoescuelas. Visualizamos que existen saberes territoriales que, sin embargo, no encuentran un espaciodónde manifestarse fuera del hogar. Concluimos que la sistematicidad en el acercamiento de losalumnos y alumnas a su cultura originaria, la permanencia en el tiempo de los asesores y asesorasculturales, el compromiso real de los profesores y profesoras no mapuches, y el respeto de estos haciala cultura, puede eventualmente lograr resultados satisfactorios en la preservación de la lengua y delas prácticas culturales en el territorio lafkenche.

  16. Saberes agrícolas tradicionales como programa académico

    Directory of Open Access Journals (Sweden)

    J. Antonio Gómez Espinoza

    2008-01-01

    Full Text Available En el marco de las crisis social y ambiental del tercer milenio, se hace necesario repensar la universidad, sus paradigmas, el concepto de educación y su modelo educativo para impactar en la construcción de la nueva sociedad. Los Saberes Agrícolas Tradicionales (SAT aportan elementos conceptuales básicos para la implementación y desarrollo de una sociedad sustentable. A partir del rescate, la sistematización de los SAT y el diálogo intercultural SAT-ciencia, se propone incorporar los Saberes Agrícolas Tradicionales como programa académico en las Instituciones de Enseñanza y Aprendizaje Agrícola del nivel Superior (IEAS.

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

    Science.gov (United States)

    Wang, Yuanshi; Wang, Shikun

    2015-01-01

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

  18. Statistical comparisons of gravity wave features derived from OH airglow and SABER data

    Science.gov (United States)

    Gelinas, L. J.; Hecht, J. H.; Walterscheid, R. L.

    2017-12-01

    The Aerospace Corporation's near-IR camera (ANI), deployed at Andes Lidar Observatory (ALO), Cerro Pachon Chile (30S,70W) since 2010, images the bright OH Meinel (4,2) airglow band. The imager provides detailed observations of gravity waves and instability dynamics, as described by Hecht et al. (2014). The camera employs a wide-angle lens that views a 73 by 73 degree region of the sky, approximately 120 km x 120 km at 85 km altitude. Image cadence of 30s allows for detailed spectral analysis of the horizontal components of wave features, including the evolution and decay of instability features. The SABER instrument on NASA's TIMED spacecraft provides remote soundings of kinetic temperature profiles from the lower stratosphere to the lower thermosphere. Horizontal and vertical filtering techniques allow SABER temperatures to be analyzed for gravity wave variances [Walterscheid and Christensen, 2016]. Here we compare the statistical characteristics of horizontal wave spectra, derived from airglow imagery, with vertical wave variances derived from SABER temperature profiles. The analysis is performed for a period of strong mountain wave activity over the Andes spanning the period between June and September 2012. Hecht, J. H., et al. (2014), The life cycle of instability features measured from the Andes Lidar Observatory over Cerro Pachon on March 24, 2012, J. Geophys. Res. Atmos., 119, 8872-8898, doi:10.1002/2014JD021726. Walterscheid, R. L., and A. B. Christensen (2016), Low-latitude gravity wave variances in the mesosphere and lower thermosphere derived from SABER temperature observation and compared with model simulation of waves generated by deep tropical convection, J. Geophys. Res. Atmos., 121, 11,900-11,912, doi:10.1002/2016JD024843.

  19. CURRÍCULO E RESISTÊNCIA: horizontes para uma ecologia de saberes

    Directory of Open Access Journals (Sweden)

    Ana Elisa de Castro Freitas

    2016-09-01

    Full Text Available O presente artigo registra uma proposta curricular inovadora, desenvolvida no Setor Litoral da Universidade Federal do Paraná. Ancorada em um projeto político-pedagógico que busca superar concepções dominantes no âmbito das políticas curriculares, esta proposta investe na redefinição dos espaços pedagógicos, potencializando fluxos de saberes, poderes e identidades. Organizado em três fases/tempos articulados a três eixos/espaços, o desenho curricular assume uma forma tridimensional e modular. Seus espaços potencializam a cultura do trabalho coletivo e integrado em práticas inter e multidisciplinares, oportunizando movimentos de resistência à racionalidade instrumental do currículo normativo-prescritivo, dominante nas instituições de ensino superior brasileiras. Para além das competências profissionais, a formação é plena de potência humanizadora e emancipatória, alinhando-se com a proposta de uma ecologia de saberes. As relações de produção e circulação de saberes são socializadas. Neste sentido, o currículo tridimensional representa uma importante ruptura com a racionalidade formalmente unidimensional, linear e progressiva, inspiradora da formação universitária ocidental, que fragmenta e distancia os campos de saberes científicos, alienando os sujeitos dos processos e meios de produção, aquisição e circulação de conhecimentos.

  20. On the Possibility of Accelerating Positron on an Electron Wake at SABER

    International Nuclear Information System (INIS)

    Ischebeck, R.; Joshi, C.; Katsouleas, T.C.; Muggli, P.; Wang, X.

    2008-01-01

    A new approach for positron acceleration in non-linear plasma wakefields driven by electron beams is presented. Positrons can be produced by colliding an electron beam with a thin foil target embedded in the plasma. Integration of positron production and acceleration in one stage is realized by a single relativistic, intense electron beam. Simulations with the parameters of the proposed SABER facility [1] at SLAC suggest that this concept could be tested there

  1. Hierarchical modelling of line commutated power systems used in particle accelerators using Saber

    International Nuclear Information System (INIS)

    Reimund, J.A.

    1993-01-01

    This paper discusses the use of hierarchical simulation models using the program Saber trademark for the prediction of magnet ripple currents generated by the power supply/output filter combination. Modeling of an entire power system connected to output filters and particle accelerator ring magnets will be presented. Special emphasis is made on the modeling of power source imbalances caused by transformer impedance imbalances and utility variances. The affect that these imbalances have on the harmonic content of ripple current is also investigated

  2. Revised Correlation between Odin/OSIRIS PMC Properties and Coincident TIMED/SABER Mesospheric Temperatures

    Science.gov (United States)

    Feofilov, A. G.; Petelina, S. V.; Kutepov, A. A.; Pesnell, W. D.; Goldberg, R. A.; Llewellyn, E. J.; Russell, J. M.

    2006-01-01

    The Optical Spectrograph and Infrared Imaging System (OSIRIS) instrument on board the Odin satellite detects Polar Mesospheric Clouds (PMCs) through the enhancement in the limb-scattered solar radiance. The Sounding of the Atmosphere using the Broadband Emission Radiometry (SABER) instrument on board the TIMED satellite is a limb scanning infrared radiometer that measures temperature and vertical profiles and energetic parameters for minor constituents in the mesosphere and lower thermosphere. The combination of OSIRIS and SABER data has been previously used to statistically derive thermal conditions for PMC existence [Petelina et al., 2005]. a, A.A. Kutepov, W.D. Pesnell, In this work, we employ the simultaneous common volume measurements of PMCs by OSIRIS and temperature profiles measured by SABER for the Northern Hemisphere summers of 2002-2005 and corrected in the polar region by accounting for the vibrational-vibrational energy exchange among the CO2 isotopes [Kutepov et al., 2006]. For each of 20 coincidences identified within plus or minus 1 degree latitude, plus or minus 2 degrees longitude and less than 1 hour time the frost point temperatures were calculated using the corresponding SABER temperature profile and water vapor densities of 1,3, and 10 ppmv. We found that the PMC presence and brightness correlated only with the temperature threshold that corresponds to the frost point. The absolute value of the temperature below the frost point, however, didn't play a significant role in the intensity of PMC signal for the majority of selected coincidences. The presence of several bright clouds at temperatures above the frost point is obviously related to the limitation of the limb geometry when some near- or far-field PMCs located at higher (and warmer) altitudes appear to be at lower altitudes.

  3. Michael Jackson antes del caos

    Directory of Open Access Journals (Sweden)

    Juan Luciano Nieves

    2015-01-01

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

  4. Individual Recognition in Ant Queens

    DEFF Research Database (Denmark)

    D'Ettorre, Patrizia; Heinze, Jürgen

    2005-01-01

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

  5. FDTD-ANT User Manual

    Science.gov (United States)

    Zimmerman, Martin L.

    1995-01-01

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

  6. Air-filled left hepatic duct: the saber sign as an aid to the radiographic diagnosis of pneumobilia

    International Nuclear Information System (INIS)

    Lewandowski, B.J.; Withers, C.; Winsberg, F.

    1984-01-01

    In the supine patient, gas rises to the left hepatic duct. Radiographically, this can be recognized as a saber-shaped lucency to the right of the spine. In a retrospective analysis and review of the radiographs of 40 patients shown to have gas in the biliary tree by ultrasound (US), computed tomography (CT), or radiography, the diagnosis could be made in 37 patients. In 18 of these 37 cases pneumobilia could be identified by the saber-shaped distribution of gas

  7. Ensino de conceitos químicos em um enfoque CTS a partir de saberes populares

    Directory of Open Access Journals (Sweden)

    Ricardo Luiz Zanotto

    Full Text Available Resumo: O presente artigo objetiva apresentar resultados de um estudo realizado sobre a utilização de saberes populares como ponto de partida para o ensino de conceitos químicos, articulando os diversos saberes sob o enfoque CTS. O trabalho foi realizado com 30 alunos da 3ª série do ensino médio de um colégio da rede estadual de ensino, da região sul do Paraná, Brasil. A abordagem metodológica foi a qualitativa, de natureza interpretativa, com observação participante. A coleta de dados se deu por meio de questionários, apresentação e discussão dos resultados das pesquisas bibliográficas, elaboração e análise de mapas conceituais, produção de infográficos (historinhas. A pesquisa demonstrou que a utilização dos saberes populares se constituiu num fator motivador e de apoio para a aprendizagem, possibilitando a contextualização dos conteúdos, tornando o ensino de Química mais atraente e significativo, facilitando, dessa maneira, a criação de estruturas cognitivas e mudanças de perfil conceitual.

  8. Mesospheric H2O Concentrations Retrieved from SABER/TIMED Measurements

    Science.gov (United States)

    Feofilov, A. G.; Marshall, B. T.; Garcia-Comas, M.; Kutepov, A. A.; Lopez-Puertas, M.; Manuilova, R. O.; Yankovsky, V.A.; Goldberg, R. A.; Gordley, L. L.; Petelin, S.; hide

    2008-01-01

    The SABER instrument on board the TIMED Satellite is a limb scanning infrared radiometer designed to measure temperature and minor constituent vertical profiles and energetics parameters in the mesosphere and lower thermosphere (MLT). The H2O concentrations are retrieved from 6.3 micron band radiances. The populations of H2O(v2) vibrational levels are in non-Local Thermodynamic Equilibrium (non-LTE) above approximately 55 km altitude and the interpretation of 6.3 micron radiance requires utilizing non-LTE H2O model that includes various energy exchange processes in the system of H2O vibrational levels coupled with O2, N2, and CO2 vibrational levels. We incorporated these processes including kinetics of O2/O3 photolysis products to our research non-LTE H2O model and applied it for the development and optimization of SABER operational model. The latter has been validated using simultaneous SCISAT1/ACE occultation measurements. This helped us to estimate CO2(020)-O2(X,v=I), O2(X,v=I)- H2O(010), and O2(X,v=1) O rates at mesopause temperatures that is critical for an adequate interpretation of non-LTE H2O radiances in the MLT. The first distributions of seasonal and meridional H2O concentrations retrieved from SABER 6.3 micron radiances applying an updated non-LTE H2O model are demonstrated and discussed.

  9. RELIGIÃO E EDUCAÇÃO: OS SABERES DA AYAHUASCA NO SANTO DAIME

    Directory of Open Access Journals (Sweden)

    Maria Betânia Barbosa Albuquerque

    2011-05-01

    Full Text Available O artigo analisa os saberes da ayahuasca, beberagem de origem indígena feita da combinação de um cipó e as folhas de um arbusto da Amazônia, utilizada em diferentes contextos culturais como é o caso da religião brasileira conhecida como Santo Daime. Metodologicamente, o artigo resulta de uma pesquisa bibliográfica, documental e de campo. Tem como fontes a bibliografia sobre as religiões ayahuasqueiras, os cadernos de hinos do Santo Daime e a realização de entrevistas com daimistas do Brasil e outros países. Teoricamente, inspira-se nos estudos de Carlos Rodrigues Brandão acerca da educação como cultura e nos escritos de Boaventura de Sousa Santos, restringindo este texto à noção de “ecologia de saberes” deste autor. Parto do pressuposto de que o daime (ayahuasca é um professor e que na religião vivencia-se um processo educativo no qual um conjunto de saberes é circulado e apreendido. Dentre os principais saberes do

  10. Lesiones en los genitales externos: Enfoque diagnóstico y conducta que debe seguir el médico de la familia

    Directory of Open Access Journals (Sweden)

    Rubén José Larrondo Muguercia

    1998-02-01

    Full Text Available Se expone la causa de las lesiones en los genitales externos según 3 grandes grupos clasificatorios y se indican en cada caso las manifestaciones clínicas más importantes y los medios de diagnóstico específicos. Se muestra una guía práctica para el correcto enfoque diagnóstico y la conducta que debe seguir el médico de la familiaThe cause of the geniatalia lesions is exposed according to three large classificatory groups. The most important clinical manifestations as well as the specific diagnostic tools are indicated for each case. A practical guide for the proper diagnostic approach and for the behavior the family physician should follow is shown

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

    Science.gov (United States)

    Pringle, Elizabeth G

    2014-06-22

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

  12. Collective search by ants in microgravity

    Directory of Open Access Journals (Sweden)

    Stefanie M. Countryman

    2015-03-01

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

  13. Ant-lepidopteran associations along African forest edges

    Science.gov (United States)

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

    2017-02-01

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

  14. Pheromone disruption of Argentine ant trail integrity

    Science.gov (United States)

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

    2008-01-01

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

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

    African Journals Online (AJOL)

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

  16. Ants as tools in sustainable agriculture

    DEFF Research Database (Denmark)

    Offenberg, Joachim

    2015-01-01

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

  17. Kunstikriitik Ants Juske sai doktoriks / Neeme Korv

    Index Scriptorium Estoniae

    Korv, Neeme, 1974-

    2003-01-01

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

  18. Fungal enzymes in the attine ant symbiosis

    DEFF Research Database (Denmark)

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

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

  19. Exotic ants (Hymenoptera, Formicidae) of Ohio

    OpenAIRE

    Ivanov,Kal

    2016-01-01

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

  20. Improving Emergency Management by Modeling Ant Colonies

    Science.gov (United States)

    2015-03-01

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

  1. Extrafloral nectar fuels ant life in deserts

    OpenAIRE

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

    2014-01-01

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

  2. Chemically armed mercenary ants protect fungus-farming societies

    DEFF Research Database (Denmark)

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

    2013-01-01

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

  3. 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.

  4. Congestion and communication in confined ant traffic

    Science.gov (United States)

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

    2014-03-01

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

  5. Fire ants perpetually rebuild sinking towers

    Science.gov (United States)

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

    2017-07-01

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

  6. An Analysis of the Acquisition Process for Simplified Acquisition of Base Engineering Requirements (SABER) Contracts and Its Potential Impact on Contractor Performance

    National Research Council Canada - National Science Library

    Heaps, Brian

    2001-01-01

    The Simplified Acquisition of Base Engineering Requirements (SABER) contract's main purpose is to expedite contract award of civil engineer requirements through the issuance of individual delivery orders...

  7. Evolutionary History of Saber-Toothed Cats Based on Ancient Mitogenomics.

    Science.gov (United States)

    Paijmans, Johanna L A; Barnett, Ross; Gilbert, M Thomas P; Zepeda-Mendoza, M Lisandra; Reumer, Jelle W F; de Vos, John; Zazula, Grant; Nagel, Doris; Baryshnikov, Gennady F; Leonard, Jennifer A; Rohland, Nadin; Westbury, Michael V; Barlow, Axel; Hofreiter, Michael

    2017-11-06

    Saber-toothed cats (Machairodontinae) are among the most widely recognized representatives of the now largely extinct Pleistocene megafauna. However, many aspects of their ecology, evolution, and extinction remain uncertain. Although ancient-DNA studies have led to huge advances in our knowledge of these aspects of many other megafauna species (e.g., mammoths and cave bears), relatively few ancient-DNA studies have focused on saber-toothed cats [1-3], and they have been restricted to short fragments of mitochondrial DNA. Here we investigate the evolutionary history of two lineages of saber-toothed cats (Smilodon and Homotherium) in relation to living carnivores and find that the Machairodontinae form a well-supported clade that is distinct from all living felids. We present partial mitochondrial genomes from one S. populator sample and three Homotherium sp. samples, including the only Late Pleistocene Homotherium sample from Eurasia [4]. We confirm the identification of the unique Late Pleistocene European fossil through ancient-DNA analyses, thus strengthening the evidence that Homotherium occurred in Europe over 200,000 years later than previously believed. This in turn forces a re-evaluation of its demography and extinction dynamics. Within the Machairodontinae, we find a deep divergence between Smilodon and Homotherium (∼18 million years) but limited diversity between the American and European Homotherium specimens. The genetic data support the hypothesis that all Late Pleistocene (or post-Villafrancian) Homotherium should be considered a single species, H. latidens, which was previously proposed based on morphological data [5, 6]. Copyright © 2017 Elsevier Ltd. All rights reserved.

  8. Saberes docente para o ensino de ciências e biologia

    Directory of Open Access Journals (Sweden)

    Cibele Bender Raio

    2017-09-01

    Full Text Available Este trabalho apresenta os saberes que configuram um bom professor. Estes saberes, caracterizados pela mudança nos padrões de participação do professor na prática pedagógica, os quais não são construídos apenas durante o curso de formação inicial, mas sim ao longo da história de vida do educador. A partir dos conhecimentos de Paulo Freire e de Edgar Morin são sugeridos temas para possíveis práticas no ensino de ciências e de biologia. Dessa forma, uma educação em que o professor só deposita o conteúdo no aluno deve ser substituída por aquela que instiga a curiosidade, valoriza a opinião a sua opinião, considera seus sentimentos e promove a sua autonomia, ou seja, converte o educando em um agente transformador da sua própria realidade. Para isso, o professor precisa atuar com sentimentalidade, criticidade e autoridade, sem autoritarismo. Além disso, é papel do educador mostrar que não há conhecimento ileso ao erro ou a ilusão. Ele, também, precisa trabalhar o contexto local em relação a um conteúdo global. É um saber ensinar a condição do humano como unidade do universo e educar sobre a identidade terrena. Considerando, além disso, as incertezas dos acontecimentos e a ética humana. As discussões aqui apresentadas são sugestões para o desenvolvimento de práticas de ensino. No entanto, o professor deve elaborá-las de acordo com o seu ambiente de trabalho e seu público.

  9. EDUCAÇÃO INFANTIL, CURRÍCULO E SABERES DOCENTES: PERCURSOS DE UMA PESQUISA-AÇÃO

    Directory of Open Access Journals (Sweden)

    Elaine Luciana Silva Sobral

    2011-03-01

    Full Text Available Apresentamos os processos, percursos e achados de uma pesquisa-ação que teve como objetivos: investigar saberes docentes necessários ao desenvolvimento de uma proposta curricular numa instituição pública de educação infantil e contribuir para a (re significação, por parte de professores, de saberes necessários à construção de uma proposta curricular para a educação infantil. Com a participação de 19 sujeitos desenvolvemos observações não-participantes; entrevistas semi-estruturadas (individuais e coletivas; análise de documentos e seminários de estudos reflexivos. Analisamos duas categorias: 1 Saberes docentes relativos às concepções de currículo/proposta curricular e 2 Saberes docentes relativos às especificidades da educação infantil. Percebemos avanços no que se refere à (resignificação de tais saberes por parte dos sujeitos, configurando rupturas importantes com suas concepções iniciais. Apontamos para a necessidade de um trabalho de formação permanente, no contexto da instituição, de modo a propiciar o diálogo entre as práticas pedagógicas e as propostas curriculares.

  10. Un acercamiento al desarrollo del saber de Estado Apuntes para una agenda de investigación

    Directory of Open Access Journals (Sweden)

    Edwin Cruz Rodríguez

    2007-01-01

    Full Text Available Este artículo se propone realizar una aproximación al desarrollo del saber de Estado, entendido como el conjunto de conocimientos necesarios para dirigir el Estado, planteando algunos elementos que pueden ahondarse en la investigación de este campo en Colombia y Latinoamérica. Es posible acercarse al tipo específico de saber que permite al Estado ejercer su poder desde dos perspectivas: una histórica, que caracteriza la formación de este saber en relación con la del Estado nación y con los contextos sociales cambiantes que supone el advenimiento de la modernidad; y otra teórica, que permite aproximarse a las relaciones causales que explican el desarrollo del saber de Estado entre las instituciones políticas, los contextos sociales y los acontecimientos históricos relevantes, entre otros. El saber de Estado se ha desarrollado por causas que se desprenden de las relaciones entre el desarrollo del conocimiento y su institucionalización, las instituciones estatales y los contextos sociales problemáticos. La causalidad entre estos no es lineal y varía de acuerdo con las relaciones de poder en contextos nacionales específicos.

  11. Saber más sobre disfagia (en Lectura Fácil)

    OpenAIRE

    Pérez, Rosa Ana

    2016-01-01

    El objetivo de la guía es que las personas con discapacidad intelectual que tienen disfagia conozcan mejor su condición y así puedan adquirir hábitos más saludables. La disfagia, al entorpecer o impedir la ingestión de alimento, puede provocar atragantamientos, infecciones, deshidratación o desnutrición. La situación se puede agravar por el desconocimiento y la falta de diagnóstico. Sin embargo, con información y los hábitos adecuados, pueden evitarse esas consecuencias. ‘Saber más sobre disf...

  12. Saberes mapuche en la relación del hombre con la naturaleza: aportes para

    OpenAIRE

    Carlos Manuel Pacheco Huaiquifil; Sonia Osses Bustingorry

    2015-01-01

    El presente artículo tiene como objetivo elaborar una propuesta educativa de educación ambiental basada en los saberes ancestrales mapuche relacionados con el cuidado medioambiental.El estudio de tipo cualitativo,utiliza la Teoría Fundamentada. Se aplicaron 12 entrevistas a personas con ascendencia mapuche y que vive no han vivido en comunidades mapuche o sectores rurales. Los resultados identifican un con junto de conocimientos de cuidado y daño medioambiental y estrategias de enseñanza que ...

  13. SABER (TIMED) and MLS (UARS) Temperature Observations of Mesospheric and Stratospheric QBO and Related Tidal Variations

    Science.gov (United States)

    Huang, Frank T.; Mayr, Hans G.; Reber, Carl A.; Russell, James; Mlynczak, Marty; Mengel, John

    2006-01-01

    More than three years of temperature observations from the SABER (TIMED) and MLS WARS) instruments are analyzed to study the annual and inter-annual variations extending from the stratosphere into the upper mesosphere. The SABER measurements provide data from a wide altitude range (15 to 95 km) for the years 2002 to 2004, while the MLS data were taken in the 16 to 55 km altitude range a decade earlier. Because of the sampling properties of SABER and MLS, the variations with local solar time must be accounted for when estimating the zonal mean variations. An algorithm is thus applied that delineates with Fourier analysis the year-long variations of the migrating tides and zonal mean component. The amplitude of the diurnal tide near the equator shows a strong semiannual periodicity with maxima near equinox, which vary from year to year to indicate the influence from the Quasi-biennial Oscillation (QBO) in the zonal circulation. The zonal mean QBO temperature variations are analyzed over a range of latitudes and altitudes, and the results are presented for latitudes from 48"s to 48"N. New results are obtained for the QBO, especially in the upper stratosphere and mesosphere, and at mid-latitudes. At Equatorial latitudes, the QBO amplitudes show local peaks, albeit small, that occur at different altitudes. From about 20 to 40 km, and within about 15" of the Equator, the amplitudes can approach 3S K for the stratospheric QBO or SQBO. For the mesospheric QBO or MQBO, we find peaks near 70 km, with temperature amplitudes reaching 3.5"K, and near 85 km, the amplitudes approach 2.5OK. Morphologically, the amplitude and phase variations derived from the SABER and MLS measurements are in qualitative agreement. The QBO amplitudes tend to peak at the Equator but then increase again pole-ward of about 15" to 20'. The phase progression with altitude varies more gradually at the Equator than at mid-latitudes. A comparison of the observations with results from the Numerical Spectral

  14. Saberes relacionados ao autocuidado entre mulheres da área rural do sul do brasil

    OpenAIRE

    Thum, Moara Ailane; Ceolin, Teila; Universidade Federal de Pelotas; Borges, Anelise Miritz; Heck, Rita Maria; Universidade Federal de Pelotas

    2011-01-01

    Este estudo teve por objetivo conhecer as ações de autocuidado de um grupo de mulheres rurais do município de Pelotas, Rio Grande do Sul. Tratou-se de uma pesquisa qualitativa, com 11 mulheres, residentes na área rural do município. A coleta de dados ocorreu entre maio e junho de 2010, através de entrevista semiestruturada. Foi realizada a análise de conteúdo por temas. As informantes mais antigas participam do grupo na comunidade há 12 anos, realizando trabalhos manuais e trocas de saberes s...

  15. Psicopatología psicoanalítica: un saber en la encrucijada

    Directory of Open Access Journals (Sweden)

    Miguel Angel Sierra Rubio

    2013-03-01

    Full Text Available Con el objetivo de esclarecer la condición epistémica de la psicopatología psicoanalítica en el marco del saber freudiano, se analizan cuestionamientos previos sobre el campo psicopatológico y sus posibles modalidades relacionales con el psicoanálisis, la psicología clínica y la psiquiatría. Los resultados destacan la originalidad de la estrategia de Freud que, bajo el nombre del psicoanálisis, cobija un discurso racional sobre la experiencia del malestar subjetivo.

  16. REFLEXIONES SOBRE SABER , REVISTA CIENTÍFICA DEL CONSEJO DE INVESTIGACION DE LA UNIVERSIDAD DE ORIENTE I REFLECTIONS ON SABER , SCIENTIFIC JOURNAL OF THE RESEARCH COUNCIL OF THE UNIVERSIDAD DE ORIENTE

    Directory of Open Access Journals (Sweden)

    GERÓNIMO OJEDA CRESPO

    2018-05-01

    Full Text Available Presents a brief account of the beginnings of the Universidad de Oriente, higher education institution seated in the eastern territory of Venezuela; as well as also related to attempts to establish a “editorial policy” in the different campuses university, periodical publications of scientific character. In describing the path of SABER periodical publication, multidisciplinary, financed and edited by the Research Council , presents a sequence of events that have marked both their presence and their contribution to the university community. Finally we suggest a number of actions to continue the important work of SABER as scientific journal of the Universidad de Oriente.

  17. The distribution of weaver ant pheromones on host trees

    DEFF Research Database (Denmark)

    Offenberg, Joachim

    2007-01-01

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

  18. Fuzzy Rules for Ant Based Clustering Algorithm

    Directory of Open Access Journals (Sweden)

    Amira Hamdi

    2016-01-01

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

  19. Perlongher: sexualidad y saber. Búsqueda ensayística y emergencia intelectual

    Directory of Open Access Journals (Sweden)

    Javier Gasparri

    2013-12-01

    Full Text Available El presente artículo se centra en la obra del argentino Néstor Perlongher (1949 – 1992 para intentar rastrear e interrogar un pensamiento sobre la sexualidad, sin descuidar las implicancias literarias del mismo, y en el marco de conjeturas críticas en torno a su singular ejercicio intelectual como así también el recurso al ensayo como forma de articulación conceptual. En esta dirección, la experiencia-límite de Perlongher permite vislumbrar (e hipotetizar consecuencias y proyecciones literarias y políticas, afi rmando así una ética. Se tratará, entonces, de una búsqueda esencialmente escrituraria del saber (en el marco de los saberes actuales a Perlongher, sobre todo las líneas posestructuralistas, y asimismo con la atención puesta en el activismo de disidencia sexual pero que también compromete y se conjuga con la puesta del cuerpo en su afirmación vital.

  20. La memoria activa del saber pedagógico en la contemporaneidad

    Directory of Open Access Journals (Sweden)

    Vladimir ZAPATA VILLEGAS

    2013-11-01

    Full Text Available El artículo presenta el reencuentro crítico de tres proyectos paradigmáticos de la memoria activa del saber pedagógico: Comenio, proyecto de Didáctica; Herbart, proyecto de Pedagogía y Dewey, proyecto de Educación, con algunas pro- blemáticas teóricas de la actualidad acerca de la educación y la enseñanza. Los resultados de dicha interlocución se vinculan hoy a una memoria viva. Se utilizaron como herramientas metodológicas el cruce de diversos enfoques y técnicas tales como: la formación de los conceptos en la arqueología de los saberes, según los aportes de Foucault; la historia de conceptos practicada por Koselleck; y la relación del concepto con el presente, desde la epistemología. Los tres pedagogos fueron abordados desde dos perspectivas: 1 la relación de sus obras maestras con el momento histórico de su producción, y 2 la inscripción en un orden temporal diferente al de su producción.

  1. O saber e a tecnologia: mitos de um centro de tratamento intensivo

    Directory of Open Access Journals (Sweden)

    Bastos Marisa Antonini Ribeiro

    2002-01-01

    Full Text Available O presente artigo apresenta os resultados de um estudo etnográfico que teve como objetivo descrever a cultura dos enfermeiros de um centro de tratamento intensivo. Acreditando que o CTI é uma subcultura do hospital e que os enfermeiros intensivistas compartilham de símbolos e significados que foram desenvolvidos através das interações sociais no contexto da Terapia Intensiva, fui buscar no interacionismo simbólico e na descrição etnográfica a fundamentação teórico-metodológica para o presente estudo. Para compreender o processo de interiorização dos universos simbólicos no CTI, busquei descrever os sistemas temáticos de significados subjacentes às atividades dos enfermeiros intensivistas, através da observação participante, da entrevista etnográfica e da análise documental. Dentre os elementos culturais descritos, foi identificado o mito do saber e da tecnologia. Concluí que os mitos da tecnologia e do saber foram socialmente estabelecidos como estratégia de sobrevivência no cotidiano da terapia intensiva, repleto de riscos e incertezas.

  2. O saber e a tecnologia: mitos de um centro de tratamento intensivo

    Directory of Open Access Journals (Sweden)

    Marisa Antonini Ribeiro Bastos

    Full Text Available O presente artigo apresenta os resultados de um estudo etnográfico que teve como objetivo descrever a cultura dos enfermeiros de um centro de tratamento intensivo. Acreditando que o CTI é uma subcultura do hospital e que os enfermeiros intensivistas compartilham de símbolos e significados que foram desenvolvidos através das interações sociais no contexto da Terapia Intensiva, fui buscar no interacionismo simbólico e na descrição etnográfica a fundamentação teórico-metodológica para o presente estudo. Para compreender o processo de interiorização dos universos simbólicos no CTI, busquei descrever os sistemas temáticos de significados subjacentes às atividades dos enfermeiros intensivistas, através da observação participante, da entrevista etnográfica e da análise documental. Dentre os elementos culturais descritos, foi identificado o mito do saber e da tecnologia. Concluí que os mitos da tecnologia e do saber foram socialmente estabelecidos como estratégia de sobrevivência no cotidiano da terapia intensiva, repleto de riscos e incertezas.

  3. El psicoanálisis y el saber acerca de la subjetividad

    Directory of Open Access Journals (Sweden)

    Emma Guillermina Ruiz Martín del Campo

    2009-01-01

    Full Text Available Al alejarse de los métodos tradicionales de la medicina e introducir la escucha de sus pacientes aquejadas de síntomas histéricos para la comprensión de sus padecimientos, Freud realizó una ruptura epistemológica que implicó la introducción de lo subjetivo en el campo del saber. Él mismo anticipó el valor que la indagación acerca del inconsciente tendría como herramienta al servicio de las ciencias sociales. Aquí se plantean cuestiones como la relación del conocimiento que se califica de científico con la irracionalidad y con lo inagotable de nuestra ignorancia. Se muestra, a través de dos ejemplos, el potencial que significa en la búsqueda de saber el compromiso del investigador con todo lo que él es en su trabajo, o sea, la utilización de su subjetividad como herramienta de investigación.

  4. Brincadeiras de rua, convivência urbana e ecologia dos saberes

    Directory of Open Access Journals (Sweden)

    ÁLAMO PIMENTEL

    2015-01-01

    Full Text Available Este artículo es el resultado de un estudio sobre la contribución de los juegos de la calle en la creación de procesos de convivencia urbana y en la diversificación de prácticas y saberes inherentes a las culturas populares que atraviesan lo cotidiano de las ciudades brasileñas. El texto se desarrolla a partir del análisis de documentos basados en los informes presentados por estudiantes de pedagogía de una institución de enseñanza superior del estado de Bahía. Los informes descriptivos analizados son el resultado de un proyecto didáctico de observación desde el punto de vista de los niños sobre la convivencia urbana. La base teórica del trabajo se inspira en las epistemologías del Sul según la propuesta de Boaventura de Sousa Santos (2008, sobre todo en lo referido a la comprensión de las ecologías de los saberes. A partir de los cuadros sinópticos presentados a lo largo del texto se expone una visión panorámica de los juegos de la calle en diferentes barrios de Salvador y sus implicaciones en la sustentabilidad de las culturas populares en los escenarios urbanos contemporáneos.

  5. Reorganização de saberes tradicionais em Los sorias, de Alberto Laiseca

    Directory of Open Access Journals (Sweden)

    Graciela Ravetti

    2014-09-01

    Full Text Available Resumo: Neste estudo, propõe-se uma consideração sobre a reformulação de saberes tradicionais em termos não metafísicos na obra do escritor argentino Alberto Laiseca, Los sorias (1998, construída a partir da convergência dos temas das religiões, da magia e da astrologia, lado a lado com outros saberes em face de (deshierarquização. Palavras chave: Literatura hispano-americana; literatura argenti­na; romance contemporâneo; ficção científica. Abstract: In this study, we propose a consideration on the reformulation of traditional knowledge in no metaphysical terms in the work of Argentine writer Alberto Laiseca, Los sorias (1998, constructed from the convergence of the themes of religion, magic and astrology alongside with other knowledge in the face of de-hierarchization. Keywords: Argentine literature; contemporary romance, science fiction, Spanish American literature.

  6. SABER Observations of the OH Meinel Airglow Variability Near the Mesopause

    Science.gov (United States)

    Marsh, Daniel R.; Smith, Anne K.; Mlynczak, Martin G.

    2005-01-01

    The Sounding of the Atmosphere using Broadband Emission Radiometry (SABER) instrument, one of four on board the TIMED satellite, observes the OH Meinel emission at 2.0 m that peaks near the mesopause. The emission results from reactions between members of the oxygen and hydrogen chemical families that can be significantly affected by mesopause dynamics. In this study we compare SABER measurements of OH Meinel emission rates and temperatures with predictions from a 3-dimensional chemical dynamical model. In general, the model is capable of reproducing both the observed diurnal and seasonal OH Meinel emission variability. The results indicate that the diurnal tide has a large effect on the overall magnitude and temporal variation of the emission in low latitudes. This tidal variability is so dominant that the seasonal cycle in the nighttime emission depends very strongly on the local time of the analysis. At higher latitudes, the emission has an annual cycle that is due mainly to transport of oxygen by the seasonally reversing mean circulation.

  7. Comparing temperature of subauroral mesopause over Yakutia with SABER radiometer data for 2002-2014

    Science.gov (United States)

    Ammosova, Anastasiya; Gavrilyeva, Galina; Ammosov, Petr; Koltovskoi, Igor

    2017-06-01

    We present the temperature database for the mesopause region, which was collected from spectral measurements of bands O2(0-1) and OH(6-2) with the infrared spectrograph SP-50 at the Maimaga station (63° N; 129.5° E) in 2002-2014. The temperature time series covers 11-year solar cycle. It is compared with the temperature obtained with the Sounding of the Atmosphere using Broadband Emission Radiometry instrument (SABER, v.1.07 and v.2.0), installed onboard the TIMED satellite. We compare temperatures measured during satellite passes at distances under 500 km from the intersection of the spectrograph sighting line with the hydroxyl emitting layer (~87 km) and oxygen emitting layer (~95 km). The time criterion is 30 min. We observe that there is a seasonal dependence of the difference between the ground-based and satellite measurements. The data obtained using SABER v2.0 show good agreement with the temperatures measured with the infrared digital spectrograph. The analysis we carried out allows us to conclude that a series of rotational temperatures obtained at the Maimaga station can be used to study temperature variations on different time scales including long-term trends at the mesopause height.

  8. Effects of solar proton events on dayglow observed by the TIMED/SABER satellite

    Science.gov (United States)

    Gao, Hong; Xu, Jiyao; Smith, Anne K.; Chen, Guang-Ming

    2017-07-01

    The effect of solar proton events on the daytime O2 and OH airglows and ozone and atomic oxygen concentrations in the mesosphere is studied using data from the Sounding of the Atmosphere using Broadband Emission Radiometry (SABER). Five events occurred in September 2005, December 2006, March 2012, May 2013, and June 2015 that satisfy two criteria: the maximum proton fluxes are larger than 1000 pfu, and daytime data in the high latitude region are available from SABER. The event in December 2006 is studied in detail, and the effects of all five events are compared in brief. The results indicate that all four parameters in the mesosphere decrease during the events. During the event in 2006, the maximum depletions of O2 and OH dayglow emission rates and ozone and atomic oxygen volume mixing ratios at 70 km are respectively 31.6%, 37.0%, 42.4%, and 38.9%. The effect of the solar proton event changes with latitude, longitude, and altitude. The depletions due to the stronger events are larger on average than those due to the weaker events. The depletions of both dayglow emission rates are weaker than those of ozone and atomic oxygen. The responses of O2 and OH nightglow emissions around their peak altitudes to the SPEs are not as strong and regular as those for dayglow in the mesosphere.

  9. Evidence of the Lower Thermospheric Winter-to-Summer Circulation From SABER CO2 Observations

    Science.gov (United States)

    Qian, Liying; Burns, Alan; Yue, Jia

    2017-10-01

    Numerical studies have shown that there is a lower thermospheric winter-to-summer circulation that is driven by wave dissipation and that it plays a significant role in trace gas distributions in the mesosphere and lower thermosphere, and in the composition of the thermosphere. However, the characteristics of this circulation are poorly known. Direct observations of it are difficult, but it leaves clear signatures in tracer distributions. The Sounding of the Atmosphere using Broadband Emission Radiometry (SABER) onboard the Thermosphere Ionosphere Mesosphere Energetics and Dynamics satellite has obtained CO2 concentration from 2002 to present. This data set, combined with simulations by the Whole Atmosphere Community Climate Model, provides an unprecedented opportunity to infer the morphology of this circulation in both the summer and winter hemispheres. Our study show that there exists a maximum vertical gradient of CO2 at summer high latitudes, driven by the convergence of the upwelling of the mesospheric circulation and the downwelling of the lower thermospheric circulation; in the winter hemisphere, the maximum vertical gradient of CO2 is located at a higher altitude, driven by the convergence of the upwelling of the lower thermospheric circulation and the downwelling of the solar-driven thermospheric circulation; the bottom of the lower thermospheric circulation is located between 95 km and 100 km, and it has a vertical extent of 10 km. Analysis of the SABER CO2 and temperature at summer high latitudes showed that the bottom of this circulation is consistently higher than the mesopause height by 10 km.

  10. Temperature Trends in the Polar Mesosphere between 2002-2007 using TIMED/SABER Data

    Science.gov (United States)

    Goldberg, Richard A.; Kutepov, Alexander A.; Pesnell, William Dean; Latteck, Ralph; Russell, James M.

    2008-01-01

    The TIMED Satellite was launched on December 7, 2001 to study the dynamics and energy of the mesosphere and lower thermosphere. The TIMED/SABER instrument is a limb scanning infrared radiometer designed to measure a large number of minor constituents as well as the temperature of the region. In this study, we have concentrated on the polar mesosphere, to investigate the temperature characteristics as a function of spatial and temporal considerations. We used the recently revised SABER dataset (1.07) that contains improved temperature retrievals in the Earth polar summer regions. Weekly averages are used to make comparisons between the winter and summer, as well as to study the variability in different quadrants of each hemisphere. For each year studied, the duration of polar summer based on temperature measurements compares favorably with the PMSE (Polar Mesospheric Summer Echoes) season measured by radar at the ALOMAR Observatory in Norway (69 N). The PMSE period should also define the summer period suitable for the occurrence of polar mesospheric clouds. The unusual short and relatively warm polar summer in the northern hemisphere

  11. A comparison of ground-based hydroxyl airglow temperatures with SABER/TIMED measurements over 23° N, India

    Science.gov (United States)

    Parihar, Navin; Singh, Dupinder; Gurubaran, Subramanian

    2017-03-01

    Ground-based observations of OH (6, 2) Meinel band nightglow were carried out at Ranchi (23.3° N, 85.3° E), India, during January-March 2011, December 2011-May 2012 and December 2012-March 2013 using an all-sky imaging system. Near the mesopause, OH temperatures were derived from the OH (6, 2) Meinel band intensity information. A limited comparison of OH temperatures (TOH) with SABER/TIMED measurements in 30 cases was performed by defining almost coincident criterion of ±1.5° latitude-longitude and ±3 min of the ground-based observations. Using SABER OH 1.6 and 2.0 µm volume emission rate profiles as the weighing function, two sets of OH-equivalent temperature (T1. 6 and T2. 0 respectively) were estimated from its kinetic temperature profile for comparison with OH nightglow measurements. Overall, fair agreement existed between ground-based and SABER measurements in the majority of events within the limits of experimental errors. Overall, the mean value of OH-derived temperatures and SABER OH-equivalent temperatures were 197.3 ± 4.6, 192.0 ± 10.8 and 192.7 ± 10.3 K, and the ground-based temperatures were 4-5 K warmer than SABER values. A difference of 8 K or more is noted between two measurements when the peak of the OH emission layer lies in the vicinity of large temperature inversions. A comparison of OH temperatures derived using different sets of Einstein transition probabilities and SABER measurements was also performed; however, OH temperatures derived using Langhoff et al. (1986) transition probabilities were found to compare well.

  12. Maestros narrados en el cine. Una mirada entreabierta sobre la escuela, el saber y la formación

    Directory of Open Access Journals (Sweden)

    Érica Elexandra Areiza-Pérez

    2011-01-01

    Full Text Available El texto realiza una reflexión pedagógica a partir de tres producciones cinematográficas, a saber, Estrellas del cielo sobre la tierra, Rojo como el cielo y La sonrisa de Mona Lisa. El foco de atención de esta reflexión tiene relación con la figura del maestro y con el modo en que acoge o entorpece el proyecto humano de sus estudiantes. También se exploran algunas tensiones propias del escenario educativo y el lugar del saber en los procesos de formación.

  13. Saberes docentes na prática do professor de música do Projeto SESC Cidadão

    OpenAIRE

    Araújo, José Magnaldo de Moura

    2016-01-01

    Este trabalho apresenta, discute e analisa como se constituem e de que forma se articulam os saberes docentes de um professor de música atuante no projeto social SESC Cidadão. Para alcançar tal objetivo foi realizada uma pesquisa que teve os seguintes objetivos específicos: verificar aspectos gerais acerca da formação cultural-profissional do professor atuante no SESC Cidadão; compreender de que forma os saberes adquiridos na formação “formal” do professor têm subsidiado sua ação pedagógica n...

  14. La lectura del cuento y su relación con los futuros enseñantes de Primaria: análisis de la práctica cultural en el curriculum formativo

    Directory of Open Access Journals (Sweden)

    Amelia Benito del Valle Eskauriaza

    2017-06-01

    Full Text Available A través de este artículo, se analiza el lugar que ocupa la lectura y más concretamente la lectura del cuento, en el saber académico de los estudiantes de magisterio y futuros profesores de primaria. Para ello se ha llevado a cabo una investigación-acción en la universidad del País Vasco UPV-EHU entre los alumnos de segundo de Magisterio de Primaria durante el primer cuatrimestre del curso académico 2015-2016. Esta investigación-acción concierne a la puesta a punto del lugar que debe ocupar la lectura del cuento como práctica cultural, en el curriculum de la formación inicial de los futuros profesores de esta etapa de la educación.

  15. Kin-informative recognition cues in ants

    DEFF Research Database (Denmark)

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

    2011-01-01

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

  16. Ant parasite queens revert to mating singly

    DEFF Research Database (Denmark)

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

    2004-01-01

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

  17. The worldwide expansion of the Argentine ant

    DEFF Research Database (Denmark)

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

    2010-01-01

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

  18. 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.

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

    Science.gov (United States)

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

    2009-06-01

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

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

    Directory of Open Access Journals (Sweden)

    Borowiec Lech

    2017-09-01

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

  1. Image Edge Tracking via Ant Colony Optimization

    Science.gov (United States)

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

    2018-04-01

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

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

    DEFF Research Database (Denmark)

    Offenberg, Hans Joachim

    2011-01-01

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

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

    African Journals Online (AJOL)

    PROF. OLIVER OSUAGWA

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

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

    DEFF Research Database (Denmark)

    Offenberg, Hans Joachim

    2011-01-01

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

  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. Daytime SABER/TIMED observations of water vapor in the mesosphere: retrieval approach and first results

    Directory of Open Access Journals (Sweden)

    S. V. Petelina

    2009-11-01

    Full Text Available This paper describes a methodology for water vapor retrieval in the mesosphere-lower thermosphere (MLT using 6.6 μm daytime broadband emissions measured by SABER, the limb scanning infrared radiometer on board the TIMED satellite. Particular attention is given to accounting for the non-local thermodynamic equilibrium (non-LTE nature of the H2O 6.6 μm emission in the MLT. The non-LTE H2O(ν2 vibrational level populations responsible for this emission depend on energy exchange processes within the H2O vibrational system as well as on interactions with vibrationally excited states of the O2, N2, and CO2 molecules. The rate coefficients of these processes are known with large uncertainties that undermines the reliability of the H2O retrieval procedure. We developed a methodology of finding the optimal set of rate coefficients using the nearly coincidental solar occultation H2O density measurements by the ACE-FTS satellite and relying on the better signal-to-noise ratio of SABER daytime 6.6 μm measurements. From this comparison we derived an update to the rate coefficients of the three most important processes that affect the H2O(ν2 populations in the MLT: a the vibrational-vibrational (V–V exchange between the H2O and O2 molecules; b the vibrational-translational (V–T process of the O2(1 level quenching by collisions with atomic oxygen, and c the V–T process of the H2O(010 level quenching by collisions with N2, O2, and O. Using the advantages of the daytime retrievals in the MLT, which are more stable and less susceptible to uncertainties of the radiance coming from below, we demonstrate that applying the updated H2O non-LTE model to the SABER daytime radiances makes the retrieved H2O vertical profiles in 50–85 km region consistent

  7. 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....

  8. Histrionicotoxin alkaloids finally detected in an ant

    DEFF Research Database (Denmark)

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

    2012-01-01

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

  9. Ants, rodents and seed predation in Proteaceae

    African Journals Online (AJOL)

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

  10. The evolution of invasiveness in garden ants

    DEFF Research Database (Denmark)

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

    2008-01-01

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

  11. The ejaculatory biology of leafcutter ants

    DEFF Research Database (Denmark)

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

    2015-01-01

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

  12. Mating, hybridisation and introgression in Lasius ants

    NARCIS (Netherlands)

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

    2011-01-01

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

  13. Ants recognize foes and not friends

    Science.gov (United States)

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

    2009-01-01

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

  14. 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...

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

    African Journals Online (AJOL)

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

  16. Operant conditioning in the ant Myrmica sabuleti.

    Science.gov (United States)

    Cammaerts, M C

    2004-11-30

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

  17. A global database of ant species abundances

    Science.gov (United States)

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

    2017-01-01

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

  18. Construcción de saberes en la web social: estado de la cuestión

    Directory of Open Access Journals (Sweden)

    Edgar Villegas Iriarte

    2016-10-01

    Full Text Available Este artículo presenta el estado de la cuestión sobre la construcción de saberes y sentidos en la web social. Es resultado de una investigación doctoral que busca desarrollar un modelo descriptivo y comprensivo de las relaciones, movimientos y actuaciones en torno a la producción de saberes en la Web social. Para hacerlos visibles, se concentró la mirada investigativa a través de los saberes viajeros. Se revisaron metabuscadores académicos y revistas especializadas; se realizó una preselección de artículos y, posteriormente, una selección que permitió revisar en detalle textos procedentes de investigaciones realizadas en Asia (incluidas Australia y Nueva Zelanda, Europa, Latinoamérica y Norteamérica. Se encontró un área de reciente creación con una alta velocidad de cambio. Igualmente, que aún no se logran comprender las lógicas de las motivaciones que llevan a las personas a crear o mantener proyectos basados en la colaboración. Finalmente, los sentidos que se le asignan a los saberes viajeros en la web social corresponden a formas de expresión, identidad y relación (socialidad.

  19. Saber y conocer: Un plan para su ensenaza (To know and to be acquainted with: A teaching plan).

    Science.gov (United States)

    Lizardi-Rivera, Carmen M.

    1995-01-01

    Focuses on how to teach English-speaking students of Spanish the practical distinction between the verbs, "saber" (to be cognizant of) and "conocer" (to be acquainted with). This article describes a solution proposed by K. Taylor for explaining the limits of the two verbs and examines similar proposals delineated in three other Spanish textbooks.…

  20. El profesional de enfermería ante el duelo por muerte perinatal

    Directory of Open Access Journals (Sweden)

    Carmen Stella Martínez Dávalos

    2018-03-01

    Full Text Available Introducción: Enfermería cuida al ser humano en la salud y en la enfermedad, desde la concepción hasta la muerte. En el área de obstetricia, es determinante el cuidado a la puérpera y la actitud del profesional, especialmente cuando el producto de la concepción fallece antes de nacer o en los primeros minutos de vida. Objetivo: Determinar la relación que existe entre la actitud del Profesional de Enfermería ante el manejo del duelo en su factor cognitivo y conductual y el cuidado ofrecido a la puérpera en duelo por muerte perinatal en su factor necesidades psicológicas y necesidades espirituales. Métodos: Fue realizado en las Unidades de Atención del Departamento de Ginecobstetricia del Hospital Universitario “Dr. Antonio María Pineda” de Barquisimeto, Estado Lara. Se utilizó un diseño no experimental, tipo transeccional correlacional/causal, el análisis de los datos se realizó a través del test de Chí cuadrado y Fischer. Resultados: Predominan los sentimientos negativos hacia la muerte por parte de los Profesionales de Enfermería, no siendo determinantes en el incremento de la eficiencia o deficiencia en la atención prestada.  Se evidencio un vacío teórico en cuanto los conocimientos y destrezas que debe manejar el profesional con respecto a la muerte, el duelo y como enfrentar estos, aun cuando el 70% de los profesionales son egresados universitarios. Conclusiones: Es necesario revisar los currículos de enfermería y capacitar en ejercicio sobre el manejo del duelo. Asimismo, crear grupos de apoyo para los profesionales de salud y los padres que sufren una perdida perinatal.

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

    African Journals Online (AJOL)

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

  2. 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.

  3. 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

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

    DEFF Research Database (Denmark)

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

    2015-01-01

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

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

    Science.gov (United States)

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

    2001-10-22

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

  6. Relaciones entre saberes políticos, participación política y educación política: Aportes de la investigación psicológica Relations between political knowledge, political participation and Political education: Contributions from psychological research

    Directory of Open Access Journals (Sweden)

    Alicia M. Lenzi

    2008-12-01

    Full Text Available Se examina la vinculación entre saberes políticos, participación política y educación política desde la ciencia política y la investigación psicológica de los conceptos de democracia y gobierno. El análisis indica que la democracia representativa otorga escaso espacio a la participación política ciudadana, y los aportes de investigaciones en psicología social, del desarrollo y educacional evidencian que los saberes políticos indispensables para una participación autónoma, resultan críticos. Aunque las representaciones sociales de democracia juveniles muestran la aceptación de valores democráticos, jóvenes y adultos revelan saberes políticos indiferenciados sobre democracia y gobierno, incluso entre docentes que enseñan esas nociones. Ante tal panorama y limitaciones de la democracia representativa, la educación política constituye una alternativa para formar ciudadanos conscientes, autónomos, activos participantes capaces de transformar la sociedad.The relationship among political knowledge, political participation and political education is examined from both political science and psychological research on the concepts of democracy and government. The analysis indicates that representative democracy gives little place to citizens for political participation. Also, contributions from research by social, developmental and, educational psychology, show that the essential knowledge to autonomous political participation turn to be critical. Although youth`s social representations of democracy show the acceptance of democratic values, youngs and adults reveal undifferentiated knowledge about democracy and government, even among teachers who teach these concepts. From such scenario and limitations of representative democracy, political education is an alternative to prepare aware, autonomous citizens; active participants able to change society.

  7. Entre el saber y la verdad,el enigma del sujeto.

    Directory of Open Access Journals (Sweden)

    Luz Stella Alzate.

    2002-03-01

    Full Text Available El presente texto constituye un intento de dimensionar la posición del sujeto tanto para la filosofía como papa el psicoanálisis, como un ser estructuralmente escindido. Esto es, como un ser constituido a partir de una división estructural entre el saber y la verdad, en medio de los cuales se prefiguran el mito y el enigma como estructuras discursivas. Partiendo de esta división, se hace un breve análisis de la tragedia de Medea, de Eurípides, de la cual se obtienen algunos elementos para ilustrar la posición de algunas mujeres en lo que respecta al fenómeno de la violencia intrafamiliar.

  8. Os saberes dos professores-referência no ensino de contabilidade

    Directory of Open Access Journals (Sweden)

    Gilberto José Miranda

    2012-08-01

    Full Text Available O presente estudo tem como propósito avaliar os saberes predominantes nos docentes percebidos como professores-referência pelos alunos de um curso de Graduação em Ciências Contábeis de uma universidade pública brasileira. O estudo justifica-se pelas recentes e significativas mudanças no contexto da Contabilidade no Brasil. Para alcance desse propósito, estruturou-se uma pesquisa qualitativa, em que foram utilizadas as seguintes estratégias de pesquisa e técnicas de coleta de dados: (i pesquisa bibliográfica em obras relevantes que tratam do tema; (ii pesquisa documental nas avaliações dos professores feitas pela instituição; (iii questionários aplicados aos alunos do último ano; (iv grupo focal com parte do grupo de alunos respondentes dos questionários; e (v entrevista semiestruturada com professores apontados pelos alunos como docentes de referência. Amparados pelas discussões tecidas acerca de saberes, competências e conhecimentos necessários à docência (Shulman, 1986; Garcia, 1992; Freire, 2000; Pimenta, 1998; Pimenta & Anastasiou, 2002; Gauthier, Martineau, Desbiens, Malo, & Simard, 1998; Tardif, 2003; Cunha, 2004; Masetto, 1998; Braslavsky, 1999; Perrenoud, 2000; Zabalza, 2006 e aqueles necessários ao ensino de contabilidade (Antonelli, Colauto, & Cunha, 2012; Miranda, 2011; Catapan, Colauto, & Sillas, 2011; Vasconcelos, 2010; Slomsky, 2009; Araujo & Santana, 2008; Celerino & Pereira, 2008; Andere & Araújo, 2008; Laffin, 2005, bem como pesquisas sobre professores exemplares (Young & Shaw, 1999; Lowman, 2007, verificaram-se os seguintes resultados: as disciplinas responsáveis pelas experiências mais significativas de aprendizagem, durante o curso, eram as percebidas como base do curso (Contabilidade Básica, Intermediária e Avançada e que apresentavam maior aplicação prática. As razões principais para escolha dos docentes de referência foram: didática ou metodologia de ensino, atitudes e qualidades

  9. Propuesta para llevar al espacio académico institucional, saberes agrícolas tradicionales

    OpenAIRE

    Gómez Espinoza, José Antonio

    2007-01-01

    Este texto se presentó como comunicación al II Congreso Internacional de Etnografía y Educación: Migraciones y Ciudadanías. Universidad Autónoma de Barcelona, Barcelona, 5-8 Septiembre 2008. Mientras en las “milpas” campesinas se practican saberes agrícolas tradicionales (SAT) para la subsistencia campesina a través de la producción de maíz y cultivos asociados (milpa), en las Instituciones de Enseñanza Agrícola Superior del país, se enseña un enorme bagaje científico y tecnológico sin con...

  10. Saber, manipulación y poder. La universidad como institución social

    Directory of Open Access Journals (Sweden)

    Napoleón Murcia Peña

    2014-01-01

    Full Text Available El texto es una reflexión sobre la universidad como institución social, realizada a partir de varios estudios desarrollados en los cuales se evidencia el interés de algunas estancias por convertirla en un escenario de manipulación y control, lo que la reduce a la racionalidad de los organismos funcionales, frente a la dinámica propia que la universidad instaura como institución social, cuya base se moviliza desde las significaciones imaginarias sociales. En este proceso, se muestra desde la lógica de la teoría de los imaginarios sociales la forma como la universidad se configura e institucionaliza en una tensión constante, entre el saber y el control, entre la función y la institución, y se dan las bases que la definen y posicionan como institución imaginaria social.

  11. A Dedicated Z-Stent for Acquired Saber-Sheath Tracheobronchomalacia

    International Nuclear Information System (INIS)

    Kishi, Kazushi; Fujimoto, Hisashi Kobayashi; Sonomura, Tetsuo; Uetani, Kosaku; Nishida, Norifumi; Ohata, Masahiro; Sato, Morio; Yamada, Ryusaku

    1997-01-01

    The tracheobronchial lumen has a continuous horseshoe arch morphology. We formed Z-stents accordingly to support the weakened cartilagenous portions. With this type of stent we treated a patient with acquired saber-sheath type tracheobronchomalacia (TBM), Rayl's type II, Johnson's grade III, whose condition was aggravated even under positive end expiratory pressure (PEEP) therapy. The patient improved gradually. No immediate complication was observed. Bronchofiberscopic examination revealed that the tracheobronchial arcade was closely strut-braced and showed no expiratory collapse. Six months later, when the patient was intubated due to asthmatic attacks, tissue ingrowth through the stent was found and removed. There was no recurrence of TBM. The patient died 2 years later of pneumoconiosis

  12. Petroscirtes pylei, a new saber-toothed blenny from the Fiji Islands (Teleostei: Blenniidae)

    Science.gov (United States)

    Smith-Vaniz, W.F.

    2005-01-01

    Petroscirtes pylei is described from three specimens, 20.3-40.9 mm SL, obtained from a deep-water reef off Suva, Viti Levu, Fiji Islands. It is distinguished from all other congeners by its color pattern, including the presence of two dark body stripes, the lower one broadly extending onto the anal fin, and the dorsal fin with a broad, dark basal stripe, superimposed by a conspicuous white spot centered on the 4th spine. Among Petroscirtes, only the new species and P. springeri typically have 12 dorsal-fin spines but they are not closely related. The holotype was collected in 104-110 m, the second deepest depth record for a species of Petroscirtes. Discovery of this new species, and an apparently second new deep-water Petroscrites (uncollected), at a different Fijian reef indicates that our knowledge of the biodiversity of this habitat and of the saber-toothed blennies is very incomplete. Copyright ?? 2005 Magnolia Press.

  13. El humanismo de Eiximenis: saber, ciudad y cortesía = Eiximenis’ Humanism: Knowledge, city and courtesy El humanismo de Eiximenis: saber, ciudad y cortesía

    Directory of Open Access Journals (Sweden)

    Conrad VILANOU TORRANO

    2013-02-01

    Medioevo, desde un punto de vista social —al reclamar el papel de la burguesía— plantea una economía de signo precapitalista. Desde un punto de vista pedagógico, y en un sentido amplio, se puede considerar a Eiximenis como un intelectual preocupado por el fomento de la vida urbana, el protagonismo de la vida activa a través del cultivo de las artes mecánicas, la expansión del saber cómo un método eficaz para luchar contra la ignorancia, el desarrollo de la lectura como instrumento para mejorar el gobierno de las ciudades y la extensión de la cortesía como un modo de atemperar los males causados por el pecado, en especial, la gula. Sin ser un humanista al pie de letra, Eiximenis —autor de una enciclopedia como Lo Crestià, escrita a fines del siglo XIV en lengua vulgar para llegar a todos los públicos— contribuye a poner las bases de una cultura pedagógica encaminada a la reforma de la sociedad a través de una serie de elementos —gusto por el saber, elogio del trabajo, expansión de la cortesía, fomento de la lectura entre las mujeres, etc.— que, en conjunto, preludian y anticipan la llegada de los nuevos tiempos renacentistas. De esta forma, se confirma la tesis que sostiene que entre la Edad Media y el Renacimiento no se dio una quiebra sino una evolución lenta que permite hablar más de continuidad que de ruptura.

  14. Variations of global gravity waves derived from 14 years of SABER temperature observations

    Science.gov (United States)

    Liu, Xiao; Yue, Jia; Xu, Jiyao; Garcia, Rolando R.; Russell, James M.; Mlynczak, Martin; Wu, Dong L.; Nakamura, Takuji

    2017-06-01

    The global gravity wave (GW) potential energy (PE) per unit mass is derived from SABER (Sounding of the Atmosphere using Broadband Emission Radiometry) temperature profiles over the past 14 years (2002-2015). Since the SABER data cover longer than one solar cycle, multivariate linear regression is applied to calculate the trend (means linear trend from 2002 to 2015) of global GW PE and the responses of global GW PE to solar activity, to QBO (quasi-biennial oscillation) and to ENSO (El Niño-Southern Oscillation). We find a significant positive trend of GW PE at around 50°N during July from 2002 to 2015, in agreement with ground-based radar observations at a similar latitude but from 1990 to 2010. Both the monthly and the deseasonalized trends of GW PE are significant near 50°S. Specifically, the deseasonalized trend of GW PE has a positive peak of 12-15% per decade at 40°S-50°S and below 60 km, which suggests that eddy diffusion is increasing in some places. A significant positive trend of GW PE near 50°S could be due to the strengthening of the polar stratospheric jets, as documented from Modern Era Retrospective-analysis for Research and Applications wind data. The response of GW PE to solar activity is negative in the lower and middle latitudes. The response of GW PE to QBO (as indicated by 30 hPa zonal winds over the equator) is negative in the tropical upper stratosphere and extends to higher latitudes at higher altitudes. The response of GW PE to ENSO (as indicated by the Multivariate ENSO Index) is positive in the tropical upper stratosphere.

  15. CONHECIMENTO-SOLIDARIEDADE COMO UM SABER DOCENTE NA MODALIDADE EAD: ATITUDES, VALORES E CONDIÇÕES

    Directory of Open Access Journals (Sweden)

    Regina Trilho Otero Xavier

    2008-07-01

    Full Text Available O presente artigo relata uma investigação que pesquisa a construção do conhecimento-solidariedade em EAD. O objetivo principal do estudo é contribuir para a implementação de ações pedagógicas em EAD na perspectiva do conhecimento-solidariedade. A partir, principalmente, dos referenciais de Boaventura Santos, Jean Piaget e Yves de La Taille procura-se compreender o que vem a ser o conhecimento-solidariedade, bem como os valores e saberes que favorecem seu desenvolvimento em ações pedagógicas de professores e alunos em EAD. Os estudos apontam que agir de acordo com o conhecimento-solidariedade exige competência cognitiva (saber ser solidário, competência afetiva (querer ser solidário e, ainda, um contexto favorável (poder ser solidário. As conclusões evidenciam que o conhecimento–solidariedade, em ações pedagógicas na modalidade EAD, está fortemente vinculado aos saberes éticos, técnicos, pedagógicos, comunicacionais e de gestão; que se trata de um saber construído progressivamente, em experiências permeadas por respeito mútuo, reciprocidade e empatia, tendo a cooperação como principal estratégia. Mas, e fundamentalmente, que a ocorrência de ações, na perspectiva do conhecimento-solidariedade, é dependente de contextos individuais de origem complexa, pois envolvem a interação de vários aspectos interligados (como: hábitos, valores, sentimentos, capacidades,... e de contextos coletivos dinâmicos (como ambientes cooperativos ou coercitivos, entre pares ou “superiores”, na presença de autoridade que incentiva ou que desfavorece a solidariedade. Palavras-chave: EaD, solidariedade, saberes docentes.

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

    NARCIS (Netherlands)

    Veen, G.F.; Olff, H.

    2011-01-01

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

  17. Edge detection in digital images using Ant Colony Optimization

    Directory of Open Access Journals (Sweden)

    Marjan Kuchaki Rafsanjani

    2015-11-01

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

  18. Comparison of rotational temperature derived from ground-based OH airglow observations with TIMED/SABER to evaluate the Einstein Coefficients

    Science.gov (United States)

    Liu, W.; Xu, J.; Smith, A. K.; Yuan, W.

    2017-12-01

    Ground-based observations of the OH(9-4, 8-3, 6-2, 5-1, 3-0) band airglows over Xinglong, China (40°24'N, 117°35'E) from December 2011 to 2014 are used to calculate rotational temperatures. The temperatures are calculated using five commonly used Einstein coefficient datasets. The kinetic temperature from TIMED/SABER is completely independent of the OH rotational temperature. SABER temperatures are weighted vertically by weighting functions calculated for each emitting vibrational state from two SABER OH volume emission rate profiles. By comparing the ground-based OH rotational temperature with SABER's, five Einstein coefficient datasets are evaluated. The results show that temporal variations of the rotational temperatures are well correlated with SABER's; the linear correlation coefficients are higher than 0.72, but the slopes of the fit between the SABER and rotational temperatures are not equal to 1. The rotational temperatures calculated using each set of Einstein coefficients produce a different bias with respect to SABER; these are evaluated over each of vibrational levels to assess the best match. It is concluded that rotational temperatures determined using any of the available Einstein coefficient datasets have systematic errors. However, of the five sets of coefficients, the rotational temperature derived with the Langhoff et al.'s (1986) set is most consistent with SABER. In order to get a set of optimal Einstein coefficients for rotational temperature derivation, we derive the relative values from ground-based OH spectra and SABER temperatures statistically using three year data. The use of a standard set of Einstein coefficients will be beneficial for comparing rotational temperatures observed at different sites.

  19. 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.

  20. The interactions of ants with their biotic environment.

    Science.gov (United States)

    Chomicki, Guillaume; Renner, Susanne S

    2017-03-15

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

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

    Science.gov (United States)

    Frederickson, Megan E

    2005-04-01

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

  2. Pedagogía y Saberes: 25 años

    Directory of Open Access Journals (Sweden)

    Alberto Martínez Boom

    2016-05-01

    Full Text Available Hace 25 años, un grupo de profesores de la Universidad Pedagógica Nacional, entre los cuales se encontraba la rectora de entonces Graciela Amaya de Ochoa, nos lanzamos a fundar la Revista Pedagogía y Saberes . El tiempo transcurrido desde su primera edición en 1990 parece suficiente para vislumbrar cómo aquello que nos propusimos arraigó, se sostuvo, mutó y se potenció a lo largo de sus 43 apariciones públicas. No se trata, por supuesto, de realizar un balance, sino de celebrar la conveniencia de quien puede mirar desde lejos, a grata distancia, y poder descifrar o incluso actualizar algunos argumentos que nos llevaron a insistir en la necesidad de fundar este proyecto cultural de gran envergadura para la Universidad y para el campo conceptual y estratégico de la pedagogía.  Una revista suele emerger en medio de exigencias, las nuestras trataban de plantear un debate conceptual, incluso estrictamente conceptual, sobre el lugar y el papel de la pedagogía y de los saberes al interior de las prácticas formativas de la Facultad de Educación de la Universidad Pedagógica Nacional. Debate profesoral más o menos restringido a criterios investigativos de quienes alimentaron y orientaron académicamente el horizonte de lo pedagógico a finales de la década de los ochenta e inicios de los noventa. La potencia de Pedagogía y Saberes  coincide con su nominativo, la Universidad ya tenía desde 1978 una publicación seriada dedicada a los asuntos de la educación, hacía falta consolidar otra producción y, con ella, a la comunidad académica capaz de poner en circulación los acumulados pedagógicos de la misma universidad. No sé hasta dónde esta insistencia se haya mantenido en la revista. No creo exagerar si llamo la atención sobre este viejo clamor que aún hoy resulta vital: necesitamos una inteligencia pedagógica, requerimos una élite pedagógica, podemos asumir la responsabilidad de una intelectualidad pedagógica capaz de

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

    Directory of Open Access Journals (Sweden)

    Tatiana P Flanagan

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

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

    DEFF Research Database (Denmark)

    Fürst, Matthias A; Nash, David Richard

    2010-01-01

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

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

    Science.gov (United States)

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

    2003-01-01

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

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

    Science.gov (United States)

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

    2013-01-01

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

  7. 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....

  8. 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.

  9. A global database of ant species abundances

    Czech Academy of Sciences Publication Activity Database

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

    2017-01-01

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

  10. Public goods dilemma in asexual ant societies

    OpenAIRE

    Dobata, Shigeto; Tsuji, Kazuki

    2013-01-01

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

  11. 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

  12. El sistema penal debe construirse a partir de las finalidades que se le asignen y del modelo de estado. ¿Cambio de paradigma gracias a la irrupción del racionalismo?

    Directory of Open Access Journals (Sweden)

    Francisco Bernate-Ochoa

    2010-03-01

    Full Text Available La construcción del delito como método lógico no debe entenderse como algo independiente del modelo de Estado en el cual se construye. El sistema penal, sin importar la escuela dogmática que se acoja, estará siempre condicionado por el modelo de Estado que definirá  las pautas  y  los parámetros  del delito.

  13. Precision Rescue Behavior in North American Ants

    Directory of Open Access Journals (Sweden)

    Katherine Taylor

    2013-07-01

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

  14. El periodista, ante la espiral de silencio

    Directory of Open Access Journals (Sweden)

    Dr. Fermín Galindo Arranz

    1998-01-01

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

  15. Recognition of social identity in ants

    Directory of Open Access Journals (Sweden)

    Nick eBos

    2012-03-01

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

  16. Saberes da enfermagem - a solidariedade como uma categoria essencial do cuidado Saberes de la enfermería - la solidaridad como una categoria esencial del cuidado Knowing of nursing - solidarity as an essencial category of care

    Directory of Open Access Journals (Sweden)

    Vera Regina Waldow

    2011-09-01

    Full Text Available Objetiva-se refletir sobre os saberes da enfermagem nos aspectos analíticos e sintéticos, segundo as novas perspectivas paradigmáticas, e destacar a solidariedade como uma das categorias do cuidado. A arte e a ciência da Enfermagem estão consubstanciadas pelo cuidado, assumido como o seu saber fazer. A solidariedade, por sua vez, elemento substancial do cuidado, é ressaltada neste texto, considerando a realidade atual, pois compõe o sentido moral e o exercício da cidadania.Su objetivo es reflexionar sobre los saberes de la Enfermería en sus aspectos analíticos y sintéticos, de acuerdo con las nuevas perspectivas paradigmáticas, y destacar la solidaridad como una de las categorías del cuidado. El arte y la ciencia de Enfermería están consustanciadas por el cuidado, asumido acá como su saber hacer. La solidaridad, por su vez, elemento esencial del cuidado, se enfatiza en el texto, teniendo en cuenta la realidad actual, que constituye el sentido moral y el ejercicio de la ciudadanía.This paper aims to reflect on the knowledge of nursing in synthetic and analytical aspects, according to new paradigmatic perspectives and emphasize solidarity as one of the categories of care. The art and science of nursing are consubstantiated by the care given in the present article as its know-how.Solidarity, in turn, substantial element of care is emphasized in the text, considering the current reality, because it makes up the moral sense and the exercise of citizenship.

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

    Science.gov (United States)

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

    2017-01-01

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

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

    Science.gov (United States)

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

    2007-10-01

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

  19. Chemically armed mercenary ants protect fungus-farming societies

    Science.gov (United States)

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

    2013-01-01

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

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

    Science.gov (United States)

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

    2013-09-24

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

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

    Science.gov (United States)

    Heinze, Jürgen; Frohschammer, Sabine; Bernadou, Abel

    2017-08-18

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

  2. Understanding Short-Term Nonmigrating Tidal Variability in the Ionospheric Dynamo Region from SABER Using Information Theory and Bayesian Statistics

    Science.gov (United States)

    Kumari, K.; Oberheide, J.

    2017-12-01

    Nonmigrating tidal diagnostics of SABER temperature observations in the ionospheric dynamo region reveal a large amount of variability on time-scales of a few days to weeks. In this paper, we discuss the physical reasons for the observed short-term tidal variability using a novel approach based on Information theory and Bayesian statistics. We diagnose short-term tidal variability as a function of season, QBO, ENSO, and solar cycle and other drivers using time dependent probability density functions, Shannon entropy and Kullback-Leibler divergence. The statistical significance of the approach and its predictive capability is exemplified using SABER tidal diagnostics with emphasis on the responses to the QBO and solar cycle. Implications for F-region plasma density will be discussed.

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

    Science.gov (United States)

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

    2018-02-01

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

  4. SABERES DE CURA: UM ESTUDO SOBRE PAJELANÇA CABOCLA E MULHERES PAJÉS DA AMAZÔNIA

    Directory of Open Access Journals (Sweden)

    Maria Betânia Barbosa Albuquerque

    2012-05-01

    Full Text Available Este artigo analisa os saberes que perpassam as práticas de cura presentes na pajelança cabocla na Amazônia, em especial, as de mulheres pajés. Tem como objetivos descrever os saberes e as práticas de cura de três mulheres residentes na cidade de Soure, na ilha do Marajó, Pará, bem como refletir sobre o papel da mulher no contexto religioso e simbólico da pajelança. Metodologicamente, o artigo resulta de uma pesquisa de campo e bibliográfica, com abordagem qualitativa, constando da análise de entrevistas narrativas com três mulheres. Teoricamente, o estudo se baseou em autores como Galvão (1955, Maués (1990; 1999, Cavalcante (2008, Montal (1986, entre outros. A pajelança ou xamanismo na Amazônia é uma prática, em geral, permitida somente aos indivíduos do sexo masculino. Entretanto, no município de Soure não há restrição da mulher no exercíco da pajelança, exercício esse que é perpassado por um arsenal de saberes que envolve o conhecimento das plantas curativas, do ritmo das águas, dos ciclos da lua e da natureza

  5. Revistas, consumos, alimentación y saberes femeninos. La propuesta de Damas y Damitas, Argentina, 1939-1944

    Directory of Open Access Journals (Sweden)

    Paula Caldo

    2016-01-01

    Full Text Available El presente artículo aborda un aspecto puntual del abanico que se extiende en torno a la problemática de la transmisión de los saberes femeninos: la transmisión escrita del saber culinario y sus connotaciones teóricas, prácticas, performativas y económicas. Específicamente, nos concentraremos en la Argentina en el cruce de las décadas de los treinta y los cuarenta, recorte que coincide con la consolidación de la sociedad de consumo y con la irrupción en el mercado editorial de una revista femenina llamada Damas y Damitas, que tomaremos como referente empírico de nuestro análisis. En dicha publicación recuperamos el accionar de la ecónoma encargada de enseñar a cocinar pero también de prescribir un deber ser y un saber elegir (la marca a sus congéneres.

  6. Saberes Híbridos: las Sugar Companys y la moderna plantación azucarera en Cuba

    Directory of Open Access Journals (Sweden)

    Fernández Prieto, Leida

    2015-06-01

    Full Text Available From the studies on the production and dissemination of knowledge, this paper explores the encounter and exchange between local and global practices and knowledge within the sugar plantation between the nineteenth and twentieth centuries, a process defined as “hybrid knowledge”. This article echoes the studies are in the region as a model of interregional also referred. Highlights some elements of Western Cuba sugar transferred to new plantations east through negotiation between local knowledge and practices and American knowledge, not without personal, imperial, scientific or businesstensions.Desde los estudios sobre la producción y difusión del conocimiento, este texto explora el encuentro e intercambio entre prácticas y saberes locales y globales dentro de la plantación azucarera entre los siglos XIX y XX, un proceso definido como “saberes híbridos”. Este artículo también se hace eco de los estudios que ven en la región como modelo de referencia interterritorial. En el texto se destacan algunos elementos del occidente azucarero cubano transferidos a las nuevas plantaciones del este a través de la negociación entre el conocimiento local y las prácticas y saberes estadounidenses, no exenta de tensiones personales, imperiales, científicas o empresariales.

  7. Aportes para la educación inicial: saberes construidos por el Proyecto Pedagógico Educativo Comunitario

    Directory of Open Access Journals (Sweden)

    Nisme Yurany Pineda-Báez

    2015-02-01

    Full Text Available En este estudio nuestro objetivo fue evidenciar los saberes y prácticas pedagógicas construidas en los 20 años de implementación del Proyecto Pedagógico Educativo Comunitario -Ppec-del Instituto Colombiano de Bienestar Familiar -ICBF-con la primera infancia. Se trata de la sistematización de 78 entrevistas que realizamos, en las que participaron 181 personas. Las categorías que nuclearon el proceso fueron la reconstrucción histórica del Ppec, la concepción, la intencionalidad, los saberes y prácticas pedagógicas y la operacionalización de la propuesta. En la génesis del Ppec se evidencia una forma de construcción de la política en diálogo con las prácticas, alimentada por la reflexión institucional y la revisión crítica de las discusiones de la época en torno al desarrollo infantil y social. Los saberes y las prácticas pedagógicas construidas con la primera infancia se caracterizan por ser participativas, significativas, contextuadas y humanizantes, constituyendo un tejido que se nutre además de los recursos comunitarios, del entorno y del medio ambiente, para constituirse en un proyecto de transformación social.

  8. Hablar y oír -Saber y poder. La poesía de Juana de Ibarbourou

    Directory of Open Access Journals (Sweden)

    María Teresa Aedo

    2016-04-01

    Full Text Available Esta investigación estudia la poesía de Juana de Ibarbourou desde Las lenguas de diamante (1919 hasta Mensajes del escriba (1953, en sus relaciones con las redes de fuerza de los discursos patriarcales. Describimos las estrategias lingüísticas propias del discurso ibarbouriano y el modo en que van configurando un decir y un saber distintos, que desarticulan la imagen convencional de mujer construida por los elementos fundamentales del saber-poder patriarcal, desenmascaran sus efectos de dominación y problematizan las posiciones establecidas para constituirse en sujeto discursivo en el marco de las relaciones de poder y de saber imperantes.   This reseach studies Juana de Ibarbourou's poetry from Las lenguas de diamante (1919 to Mensajes del Escriba (1953, in their relation with the patriarchal discourse of strengths. We describe the own ibarbourian discourse and the way in which it configures different saying and known. Furthermore, it desarticulates the wonen's conventional image built by the fundamental elements of patriarchal knowledge and power, unmasking the dominance and problematic effects at stablished social position. All this in order to constitute a discoursive subject within the knowledge -power imperative relations.

  9. Saberes e interculturalidad: Dilemas y aprendizajes en una experiencia con afrodescendientes colombianas

    Directory of Open Access Journals (Sweden)

    María Irene Victoria-Morales

    2017-01-01

    Full Text Available Este artículo describe los resultados de la investigación: Diálogos afrocéntricos y occidentales en el entrenamiento de terapeutas comunitarios, que se desarrolló en 2013 con una metodología de acción participativa. El propósito del estudio fue analizar cómo un grupo de mujeres colombianas afrodescendientes, desplazadas de la Costa Pacífica en la ciudad de Cali, construyeron sentido en un encuentro pedagógico con un grupo de estudiantes estadounidenses del programa de terapia familiar de la universidad Lewis & Clark, en Portland, Oregon. Los resultados examinan los siguientes temas: el proceso de las mujeres de construcción colectiva de sentido sobre sus saberes como prácticas de resistencia; el significado crítico, nuevo y emergente de las prácticas culturales como una posibilidad de reconfigurar la identidad colectiva; la reconstrucción del tejido social; y el fortalecimiento de las eficacias simbólicas al trabajar terapéuticamente con familias.

  10. Acompanhamento terapêutico: história, clínica e saber

    Directory of Open Access Journals (Sweden)

    Raymundo de Oliveira Reis Neto

    Full Text Available Abordando o acompanhamento terapêutico (AT de uma perspectiva histórica, o artigo tem como objetivo enfocar algumas transformações pelas quais essa modalidade de tratamento passou desde seu surgimento, mostrando sua relevância para a compreensão e o enfrentamento de alguns desafios com que se depara hoje. Destacando mudanças que concernem tanto a demanda por essa prática como os seus objetivos e o perfil daquele que a desempenha (AT, focalizamos a emergência e os desdobramentos de uma preocupação dos acompanhantes terapêuticos com o manejo do vínculo e da escuta. Tal preocupação os tem conduzido a um esforço de sistematização teórica do acompanhamento terapêutico que levanta importantes questões acerca da relação do AT com o saber que o credencia a praticar sua função.

  11. El dispositivo de subjetivación escolar: el poder, el saber, el deseo

    Directory of Open Access Journals (Sweden)

    Mónica Zuleta P

    1995-04-01

    Full Text Available Este ensayo propone una mirada que busca abrir nuevos caminos para el desarrollode investigaciones sobre violencia. Esta mirada está inscrita dentro de un marco orientado por opciones teóricas en las que se describe la manera como los sujetos y los objetos se dan forma en el juego de la relación de líneas de fuerzas referidas al poder, al saber y al deseo, líneas que generan dispositivos de subjetivación. Desde esta perspectiva, no existe un sujeto que ya constituído, voluntariamente pretenda orientar su acción para el logro de determinados fines del objeto, sino, por el contrario, son las fuerzas las que conforman tanto a los sujetos como a los objetos, al originar códigos variables, que dependen de la dirección que imprima la interacción de las fuerzas. La escuela, como espacio en el que confluyen todas las fuerzas en su movimiento constante, constituye subjetividades, atrapadas en dispositivos de poder con propósitos diferentes; pero también posibilita fugas a los códigos. Es en este espacio móvil del código y de la fuga, donde proponemos situar la disposición para la violencia.

  12. EL DISPOSITIVO DE SUBJETIVACION ESCOLAR: EL PODER, EL SABER, EL DESEO

    Directory of Open Access Journals (Sweden)

    Mónica Zuleta P.

    1995-01-01

    Full Text Available Este ensayo propone una mirada que busca abrir nuevos caminos para el desarrollo de investigaciones sobre violencia. Esta mirada está inscrita dentro de un marco orientado por opciones teóricas en las que se describe la manera como los sujetos y los objetos se dan forma en el juego de la relación de líneas de fuerzas referidas al poder, al saber y al deseo, líneas que generan dispositivos de subjetivación. Desde esta perspectiva, no existe un sujeto que ya constituído, voluntariamente pretenda orientar su acción para el logro de determinados fines del objeto, sino, por el contrario, son las fuerzas las que conforman tanto a los sujetos como a los objetos, al originar códigos variables, que dependen de la dirección que imprima la interacción de las fuerzas. La escuela, como espacio en el que confluyen todas las fuerzas en su movimiento constante, constituye subjetividades, atrapadas en dispositivos de poder con propósitos diferentes; pero también posibilita fugas a los códigos. Es en este espacio móvil del código y de la fuga, donde proponemos situar la disposición para la violencia.

  13. O AMOR AO SABER EM TEMPOS DE HAMARTIA / The love of knowledge in times of hamartia

    Directory of Open Access Journals (Sweden)

    Amarildo Luiz Trevisan

    2014-11-01

    Full Text Available O artigo apresenta uma reflexão a respeito da relação de amor com o conhecimento em tempos de hamartia. Partindo de um episódio relatado no romance A culpa é das estrelas, de John Green, que narra a trajetória de uma garota com câncer e fim trágico próximo, questiona o atual estágio do conhecimento, propondo discutir a necessidade de novas formas de expressão no contexto pós-traumático. Procura desvendar essa questão expondo a racionalidade escondida por trás do amplo panorama de tratamento das catástrofes, bem como alguns déficits das políticas oficiais adotadas no Brasil, com ênfase no enfoque multidisciplinar. Nesse sentido, a relação entre “educação, muldisciplinaridade e diversidade” é vista sob a perspectiva de articulação entre sofia e hamartia. Palavras-chave: Amor ao saber. Hamartia. Educação. Multidisciplinaridade. Diversidade.

  14. Memoria, palabra y acción: La historia patria, un saber para el sentimiento

    Directory of Open Access Journals (Sweden)

    Alba Patricia Cardona Zuluaga

    2016-01-01

    Full Text Available Este artículo que proponemos intentará explorar las relaciones entre historia y retórica en una modalidad textual particular: la denominada historia patria, cuyo origen se puede rastrear en Colombia a partir de 1850 con el Compendio de la historia de la Nueva Granada, de José Antonio de Plaza; el Catecismo republicano, de Cerbeleón Pinzón y, posteriormente, con los libros escritos por José Joaquín Borda (Historia de Colombia contada a los niños y José María Quijano Otero (Compendio de historia patria. Queremos destacar que la historia patria no es equivalente a la historia nacional toda vez que su carácter de compendio o resumen define no solo unas prácticas específicas de la escritura histórica sino que además sigue unida a los géneros literarios establecidos por la retórica y que su carácter oralizable orienta las potencialidades de los libros y de sus contenidos, más en relación con la memoria, que con los límites de un saber objetivo y reflexivo.

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

    Science.gov (United States)

    Steck, Kathrin

    2012-04-01

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

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

    Science.gov (United States)

    Shingleton, A W; Foster, W A

    2000-09-22

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

  17. Retrieval of Kinetic Temperature and Carbon Dioxide Abundance from Non-Local Thermodynamic Equilibrium Limb Emission Measurements made by the SABER Experiment on the TIMED Satellite

    Science.gov (United States)

    Mertens, Christopher J.; Mlynczak, Martin G.; Lopez-Puertas, Manuel; Wintersteiner, Peter P.; Picard, Richard H.; Winick, Jeremy R.; Gordley, Larry L.; Russell, James M., III

    2002-01-01

    The Sounding of the Atmosphere using Broadband Emission Radiometry (SABER) experiment was launched onboard the TIMED satellite in December, 2001. SABER is designed to provide measurements of the key radiative and chemical sources and sinks of energy in the mesosphere and lower thermosphere (MLT). SABER measures Earth limb emission in 10 broadband radiometer channels ranging from 1.27 micrometers to 17 micrometers. Measurements are made both day and night over the latitude range from 54 deg. S to 87 deg. N with alternating hemisphere coverage every 60 days. In this paper we concentrate on retrieved profiles of kinetic temperature (T(sub k)) and CO2 volume mixing ratio (vmr), inferred from SABER-observed 15 micrometer and 4.3 micrometer limb emissions, respectively. SABER-measured limb radiances are in non-local thermodynamic equilibrium (non-LTE) in the MLT region. The complexity of non-LTE radiation transfer combined with the large volume of data measured by SABER requires new retrieval approaches and radiative transfer techniques to accurately and efficiently retrieve the data products. In this paper we present the salient features of the coupled non-LTE T(sub k)/CO2 retrieval algorithm, along with preliminary results.

  18. 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.

  19. 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.

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

    Directory of Open Access Journals (Sweden)

    David J Gonthier

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

  1. 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.

  2. Insecticide transfer efficiency and lethal load in Argentine ants

    Energy Technology Data Exchange (ETDEWEB)

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

    2015-10-15

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

  3. 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

  4. Insecticide transfer efficiency and lethal load in Argentine ants

    International Nuclear Information System (INIS)

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

    2015-01-01

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

  5. Disease dynamics in a specialized parasite of ant societies

    DEFF Research Database (Denmark)

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

    2012-01-01

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

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

    Directory of Open Access Journals (Sweden)

    Kyle M Turner

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

  7. 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.

  8. The Evolution of Invasiveness in Garden Ants

    Science.gov (United States)

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

    2008-01-01

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

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

    Science.gov (United States)

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

    2009-01-01

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

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

    DEFF Research Database (Denmark)

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

    2011-01-01

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

  11. Comparative Biomechanical Modeling of Metatherian and Placental Saber-Tooths: A Different Kind of Bite for an Extreme Pouched Predator.

    Science.gov (United States)

    Wroe, Stephen; Chamoli, Uphar; Parr, William C H; Clausen, Philip; Ridgely, Ryan; Witmer, Lawrence

    2013-01-01

    Questions surrounding the dramatic morphology of saber-tooths, and the presumably deadly purpose to which it was put, have long excited scholarly and popular attention. Among saber-toothed species, the iconic North American placental, Smilodon fatalis, and the bizarre South American sparassodont, Thylacosmilus atrox, represent extreme forms commonly forwarded as examples of convergent evolution. For S. fatalis, some consensus has been reached on the question of killing behaviour, with most researchers accepting the canine-shear bite hypothesis, wherein both head-depressing and jaw closing musculatures played a role in delivery of the fatal bite. However, whether, or to what degree, T. atrox may have applied a similar approach remains an open question. Here we apply a three-dimensional computational approach to examine convergence in mechanical performance between the two species. We find that, in many respects, the placental S. fatalis (a true felid) was more similar to the metatherian T. atrox than to a conical-toothed cat. In modeling of both saber-tooths we found that jaw-adductor-driven bite forces were low, but that simulations invoking neck musculature revealed less cranio-mandibular stress than in a conical-toothed cat. However, our study also revealed differences between the two saber-tooths likely reflected in the modus operandi of the kill. Jaw-adductor-driven bite forces were extremely weak in T. atrox, and its skull was even better-adapted to resist stress induced by head-depressors. Considered together with the fact that the center of the arc described by the canines was closer to the jaw-joint in Smilodon, our results are consistent with both jaw-closing and neck musculature playing a role in prey dispatch for the placental, as has been previously suggested. However, for T. atrox, we conclude that the jaw-adductors probably played no major part in the killing bite. We propose that the metatherian presents a more complete commitment to the already

  12. Antônio Gonçalves Gomide: uma semiologia das doenças nervosas no Brasil Antônio Gonçalves Gomide: a semiotics of nervous illnesses in Brazil

    Directory of Open Access Journals (Sweden)

    Simone Santos de Almeida Silva

    2010-12-01

    Full Text Available Analisa o parecer médico de Antônio Gonçalves Gomide, publicado em 1814. Trata-se de análise crítica realizada pelo médico, a fim de compreender as manifestações de uma beata, Germana Maria da Purificação, que viveu em Minas Gerais, entre os séculos XVIII e XIX. No texto o médico se contrapõe a um exame realizado por dois cirurgiões que declararam o estado da beata como sobrenatural. A intenção é analisar o parecer situando a concepção da patologia da beata para destacar a importância do documento na compreensão da constituição dos saberes médicos no Brasil. Procura-se ressaltar o fato de o texto ter sido um dos primeiros publicados sobre a medicina mental, podendo ser considerado um dos escritos fundadores dessa medicina que se inaugurava no Brasil no século XIX.In 1814, physician Antônio Gonçalves Gomide published a medical report in which he offered a critical analysis of the manifestations of a beata (holy woman, Germana Maria da Purificação, who lived in Minas Gerais between the eighteenth and nineteenth centuries. The doctor disagreed with the examination performed by two surgeons, who declared that the state of the beata was "supernatural." The present article analyzes the doctor's report and situates his view of the holy woman's pathology. The text was one of the first ever published on mental medicine and as such stands both as one of the foundational writings of a field that emerged in Brazil in the nineteenth century and also as a valuable source in understanding the formation of medical knowledge in this country.

  13. La escritura como espada ante el machismo

    OpenAIRE

    Rottoli, Sofía

    2016-01-01

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

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

    Science.gov (United States)

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

    2005-09-22

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

  15. Ante-natal ionising radiation and cancer

    International Nuclear Information System (INIS)

    Anon.

    1988-01-01

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

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

    NARCIS (Netherlands)

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

    2002-01-01

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

  17. Atención Segura Salva Vidas “Qué debemos saber y hacer sobre la seguridad del paciente”

    Directory of Open Access Journals (Sweden)

    Rubén D. Camargo R.

    2009-06-01

    Full Text Available

    “LA OPS, fundada en 1902, trabaja con todos los países de las Américas para mejorar la salud y la calidad de vida de su población. Es, además, la Oficina Regional para las Américas de la Organización Mundial de la Salud (OMS.”

    Introducción

    En todo el mundo, los sistemas de salud reconocen hoy en día que la seguridad del paciente es una cuestión de prioritaria importancia. El programa de trabajo de Soluciones para la Seguridad del Paciente de la OMS aborda varias áreas cruciales de riesgo para los pacientes ante una intervención Médica.

    El objetivo de este documento en el “Saber”, es presentar la situación mundial de la seguridad del paciente a través de campañas de la OMS/OPS; y en el “Hacer” presentar la actividad realizada por la Academia Nacional Capitulo del Atlántico en la promoción y prevención de la seguridad del paciente a través de la campaña: ATENCIÓN SEGURA SALVA VIDAS.

    Lo Que Debemos Saber

    1. Soluciones para la seguridad del paciente

    La Organización Mundial de la Salud (OMS lanzó en 2005 “Nueve soluciones para la seguridad del paciente” a fin de ayudar a reducir el tributo de daños relacionados con la atención sanitaria que pagan millones de pacientes en todo el mundo. Son intervenciones y acciones que han reducido los problemas relacionados con la seguridad del paciente en algunos países, y se difunden ahora de manera accesible para que los Estados Miembros de la OMS entre ellos Colombia puedan usarlas y adaptarlas a fin de reformular los procedimientos de asistencia al enfermo y hacerlos más seguros.

    Básicamente estas soluciones tienen por objeto ayudar a reformular la asistencia a los enfermos y evitar eventos adversos perjudiciales para los pacientes.

    Las soluciones guardan relación con los siguientes conceptos: medicamentos de aspecto o nombre parecidos; identificación de pacientes; comunicación durante el traspaso de

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

    Science.gov (United States)

    Ballantyne, Gavin; Willmer, Pat

    2012-01-01

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

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

    Science.gov (United States)

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

    2001-10-01

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

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

    Directory of Open Access Journals (Sweden)

    Robert B. Pape

    2016-09-01

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

  1. ANT tuner retrofit for LEB cavity

    International Nuclear Information System (INIS)

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

    1994-03-01

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

  2. Loading pattern optimization using ant colony algorithm

    International Nuclear Information System (INIS)

    Hoareau, Fabrice

    2008-01-01

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

  3. Ant Foraging Behavior for Job Shop Problem

    Directory of Open Access Journals (Sweden)

    Mahad Diyana Abdul

    2016-01-01

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

  4. EL CONFLICTO COLOMBIANO ANTE LA COMUNIDAD INTERNACIONAL

    Directory of Open Access Journals (Sweden)

    Roberto González Arana

    2001-01-01

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

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

    Directory of Open Access Journals (Sweden)

    Katherine C Horn

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

  6. Epidemiologia e saber científico Epidemiology and scientific knowledge

    Directory of Open Access Journals (Sweden)

    Rita Barradas Barata

    1998-04-01

    Full Text Available Todo conhecimento, seja ele oriundo do cotidiano ou das interpretações mágicas, religiosas, filosóficas, científicas ou artísticas da realidade, tem sua origem em problemas práticos. Desde a Antigüidade o homem preocupou-se com as doenças e suas causas. Entretanto, os saberes referentes ao processo saúde-doença em sua dimensão coletiva só ultrapassam o limiar de positividade , isto é, só se individualizam como prática discursiva, no século XVII, quando as noções de população, Estado e coletivo ganham significado social. Tais saberes, entretanto, não caracterizam ainda uma disciplina científica com seu conjunto particular de enunciados, normas de verificação e coerência. A superação do limiar de epistemologização só se dará no século XIX, com a incorporação de cálculos estatísticos, formulação de taxas, desenvolvimento de teorias de causalidade e elaboração dos métodos de investigação. Na primeira metade do século XX observa-se a transição da disciplina para a ciência epidemiológica, marcada pela incorporação de instrumentos analíticos da Bioestatística, explicitação do caráter coletivo do objeto e sistematização dos métodos. Atualmente vive-se nova etapa de transição para o limiar de formalização.All knowledge, whether routine or based upon magical, religious, philosophical, scientific or artistic interpretations of reality, originates from practical problems. Since ancient times man has been concerned with diseases and their causes. Nevertheless, knowledge of the health-disease process in its collective sense, only crosses the threshold of positivity, that is to say, it only stands out as a discoursal practice, in the 17th century when the ideas of population, State and collectivity gain social significance. This knowledge, however, does not yet characterize a scientific discipline with its own set of enunciations, rules of investi-gation and coherence. The epistemological threshold

  7. Sistematização da assistência: aproximando o saber acadêmico, o saber-fazer e o legislar em saúde Sistematización de la asistencia: aproximando el saber académico, el saber-hacer y el legislar en salud Patient care system: bringing health care practice, knowledge and legislation together

    Directory of Open Access Journals (Sweden)

    Magda Santos Koerich

    2007-12-01

    Full Text Available OBJETIVOS: Analisar a Sistematização da Assistência de Enfermagem (SAE utilizada em dois hospitais de grande porte, um público e um privado, sob o olhar do pensamento complexo; Compreender o significado da SAE para os profissionais da equipe multiprofissional da saúde nessas duas instituições. MÉTODOS: Utilizou-se a Teoria Fundamentada nos Dados com entrevista semi-estruturada com 15 participantes. RESULTADOS: O tema Vislumbrando a SAE como Fenômeno interativo e complexo foi identificado como central, pois perpassa os dois fenômenos: Verificando a possibilidade de um cuidado interativo, complementar e multiprofissional e Percebendo a desarticulação entre o saber fazer e o legislar. Discutiremos o segundo fenômeno. CONCLUSÃO: Apesar de ser recomendada pelas teóricas, orientada pelo ensino formal e exigida pela legislação profissional, a implementação da SAE ainda é incipiente, sugerindo-se inová-la à luz do pensamento complexo e da interdisciplinaridade, trazendo novas possibilidades.OBJETIVOS: Analizar la SAE utilizada en dos hospitales de primer nivel, uno público y otro privado, bajo la óptica del pensamiento complejo; Comprender el significado de la SAE para los profesionales del equipo multiprofesional de la salud en esas dos instituciones. Métodos: Se utilizó la Teoría Fundamentada en los Datos con entrevista semi-estructurada a 15 participantes. RESULTADOS: El tema Vislumbrando la SAE como Fenómeno Interactivo y Complejo fue identificado como central, pues atraviesa los dos fenómenos: Verificando la posibilidad de un cuidado interactivo, complementario y multiprofesional y Percibiendo la desarticulación entre el saber el hacer y el legislar. Discutiremos el segundo fenómeno. CONCLUSIÓN: A pesar de ser recomendada por las teóricas, orientada por la enseñanza formal y exigida por la legislación profesional, la implementación de la SAE aun es incipiente, sugiriéndose innovarla a la luz del pensamiento

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

    Science.gov (United States)

    Matsuura, Kenji; Yashiro, Toshihisa

    2006-10-01

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

  9. Ensino na comunidade e inteligência coletiva: partilhando saberes com o WIKI

    Directory of Open Access Journals (Sweden)

    Antonio Pithon Cyrino

    Full Text Available As novas tecnologias de informação e comunicação têm permitido a produção de inovações no processo de ensino-aprendizagem no ensino superior. Neste estudo de intervenção e pesquisa em disciplina de ensino em comunidade da Faculdade de Medicina de Botucatu - Unesp (FMB-Unesp, procura-se explorar tais possibilidades mediante o envolvimento de alunos, professores e membros da própria comunidade. Para tanto, desenvolveu-se uma página Wiki, com informações produzidas pelos alunos a respeito de um bairro da cidade de Botucatu, com o objetivo de criar um ambiente de troca, interação, cooperação e produção compartilhada de conhecimentos entre esses sujeitos. Um grupo de jovens dessa comunidade recebeu treinamento no uso do Wiki, o que lhes permitiu incluir na página informações novas sobre o território. A análise mostra que na produção textual desses jovens ganhou destaque alguns elementos significativos de seu cotidiano. A presença de um professor tutor na comunidade foi essencial para o êxito do processo. Os resultados alcançados apontam a viabilidade e potencialidade do uso do Wiki como ferramenta de inteligência coletiva, por permitir a troca de saberes entre alunos e comunidade, valorizando toda forma de conhecimento e a expressão das singularidades.

  10. Implications of diet for the extinction of saber-toothed cats and American lions.

    Directory of Open Access Journals (Sweden)

    Larisa R G Desantis

    Full Text Available The saber-toothed cat, Smilodon fatalis, and American lion, Panthera atrox, were among the largest terrestrial carnivores that lived during the Pleistocene, going extinct along with other megafauna ∼12,000 years ago. Previous work suggests that times were difficult at La Brea (California during the late Pleistocene, as nearly all carnivores have greater incidences of tooth breakage (used to infer greater carcass utilization compared to today. As Dental Microwear Texture Analysis (DMTA can differentiate between levels of bone consumption in extant carnivores, we use DMTA to clarify the dietary niches of extinct carnivorans from La Brea. Specifically, we test the hypothesis that times were tough at La Brea with carnivorous taxa utilizing more of the carcasses. Our results show no evidence of bone crushing by P. atrox, with DMTA attributes most similar to the extant cheetah, Acinonyx jubatus, which actively avoids bone. In contrast, S. fatalis has DMTA attributes most similar to the African lion Panthera leo, implying that S. fatalis did not avoid bone to the extent previously suggested by SEM microwear data. DMTA characters most indicative of bone consumption (i.e., complexity and textural fill volume suggest that carcass utilization by the extinct carnivorans was not necessarily more complete during the Pleistocene at La Brea; thus, times may not have been "tougher" than the present. Additionally, minor to no significant differences in DMTA attributes from older (∼30-35 Ka to younger (∼11.5 Ka deposits offer little evidence that declining prey resources were a primary cause of extinction for these large cats.

  11. Estimation of Mesospheric Densities at Low Latitudes Using the Kunming Meteor Radar Together With SABER Temperatures

    Science.gov (United States)

    Yi, Wen; Xue, Xianghui; Reid, Iain M.; Younger, Joel P.; Chen, Jinsong; Chen, Tingdi; Li, Na

    2018-04-01

    Neutral mesospheric densities at a low latitude have been derived during April 2011 to December 2014 using data from the Kunming meteor radar in China (25.6°N, 103.8°E). The daily mean density at 90 km was estimated using the ambipolar diffusion coefficients from the meteor radar and temperatures from the Sounding of the Atmosphere using Broadband Emission Radiometry (SABER) instrument. The seasonal variations of the meteor radar-derived density are consistent with the density from the Mass Spectrometer and Incoherent Scatter (MSIS) model, show a dominant annual variation, with a maximum during winter, and a minimum during summer. A simple linear model was used to separate the effects of atmospheric density and the meteor velocity on the meteor radar peak detection height. We find that a 1 km/s difference in the vertical meteor velocity yields a change of approximately 0.42 km in peak height. The strong correlation between the meteor radar density and the velocity-corrected peak height indicates that the meteor radar density estimates accurately reflect changes in neutral atmospheric density and that meteor peak detection heights, when adjusted for meteoroid velocity, can serve as a convenient tool for measuring density variations around the mesopause. A comparison of the ambipolar diffusion coefficient and peak height observed simultaneously by two co-located meteor radars indicates that the relative errors of the daily mean ambipolar diffusion coefficient and peak height should be less than 5% and 6%, respectively, and that the absolute error of the peak height is less than 0.2 km.

  12. Understanding and Forecasting Upper Atmosphere Nitric Oxide Through Data Mining Analysis of TIMED/SABER Data

    Science.gov (United States)

    Flynn, S.; Knipp, D. J.; Matsuo, T.; Mlynczak, M. G.; Hunt, L. A.

    2017-12-01

    Storm time energy input to the upper atmosphere is countered by infrared radiative emissions from nitric oxide (NO). The temporal profile of these energy sources and losses strongly control thermospheric density profiles, which in turn affect the drag experienced by low Earth orbiting satellites. Storm time processes create NO. In some extreme cases an overabundance of NO emissions unexpectedly decreases atmospheric temperature and density to lower than pre-storm values. Quantifying the spatial and temporal variability of the NO emissions using eigenmodes will increase the understanding of how upper atmospheric NO behaves, and could be used to increase the accuracy of future space weather and climate models. Thirteen years of NO flux data, observed at 100-250 km altitude by the SABER instrument onboard the TIMED satellite, is decomposed into five empirical orthogonal functions (EOFs) and their amplitudes to: 1) determine the strongest modes of variability in the data set, and 2) develop a compact model of NO flux. The first five EOFs account for 85% of the variability in the data, and their uncertainty is verified using cross-validation analysis. Although these linearly independent EOFs are not necessarily independent in a geophysical sense, the first three EOFs correlate strongly with different geophysical processes. The first EOF correlates strongly with Kp and F10.7, suggesting that geomagnetic storms and solar weather account for a large portion of NO flux variability. EOF 2 shows annual variations, and EOF 3 correlates with solar wind parameters. Using these relations, an empirical model of the EOF amplitudes can be derived, which could be used as a predictive tool for future NO emissions. We illustrate the NO model, highlight some of the hemispheric asymmetries, and discuss the geophysical associations of the EOFs.

  13. The variability of SE2 tide extracted from TIMED/SABER observations

    Science.gov (United States)

    Li, X.; Wan, W.; Ren, Z.

    2017-12-01

    Based on the temperature observations of the TIMED/SABER in mesosphere/lower thermosphere region (70-110 km altitudes) and at the low latitude and midlatitude (45°S-45°N) from 2002 to 2012, the variability of the nonmigrating tide SE2 with 1 day resolution is analyzed. It is found that the climatological features (large-scale variability) of the semidiurnal nonmigrating tide with zonal wave number 2 (SE2) tide are similar with the results from the previous research works. The SE2 tide manifests mainly at the low-mid latitudes around ±30°. The northern hemisphere tidal amplitudes below 110 km are larger than the southern hemisphere tide. SE2 peaks below 110 km mainly present between 100 and 110 km altitude. The tidal amplitudes below 110 km occur a north-south asymmetry about the equator in the annual variation: in the southern hemisphere, SE2 occurs with an obvious annual variation with a maximum of tidal amplitudes in December, while in the northern one, the semiannual variations with maximum at the equinoxes. Herein, owing to the high-resolution tidal data, we could research the short-term (day-to-day) variations of SE2. We found that the day-to-day variations manifest mainly at between 100 and 110 km altitudes; it increases gradually with latitudes, and it is stronger at the low-mid latitudes; it is relatively slightly stronger around solstices than equinoxes; and it does not present a remarkably interannual variation. The SE2 day-to-day variations may be composed by the absolute amplitudes' variance and the impact of the wave phases, and the latter ones are more important.

  14. Interhemispheric Asymmetry in the Mesosphere and Lower Thermosphere Observed by SABER/TIMED

    Science.gov (United States)

    Yee, J. H.

    2017-12-01

    In this paper we analyze nearly 15 years of satellite observations of temperature, airglow, and composition in the Mesosphere and Lower Thermosphere (MLT) to quantify their interhemispheric asymmetries ao one can provide quantitative links between observed asymmetries and the spatial and temporal variations of the gravity wave activity. Two processes are believed to be responsible for observed interhemispheric differences in the MLT. The first is the direct radiation effect from the eccentricity of the Earth orbit amd the other is the difference in gravity wave source distribution and filtering due to asymmetries in mean winds of the lower atmosphere. Both processes have been theoretically investigated to explain the observed asymmetry in some of the atmospheric parameters, but not self-consistently in all observed parameters together. In this paper we will show the asymmetry in the time-varying zonal-mean latitudinal structures of temperature, airglow emission rate, and composition observed by TIMED/SABER. We will quantify their interhemispheric asymmetries for different seasons under different solar activity conditions. In addition, temperature measurements will also be used to obtain temporal and spatial morphology of gravity wave potential energies. We will interpret the asymmetry in the observed fields and examine qualitatively their consistency with the two responsible processes, especially the one due to gravity wave filtering process. Our goal is to introduce and to share the spatial and temporal morphologies of all the observed fields to the modeling community so, together self-consistently, they be can be used to gain physical insights into the relative importance of various drivers responsible for the observed asymmetry, especially the role of gravity wave induced eddy drag and mixing, a critical, but least quantitatively understood process.

  15. ¿Por qué la protección de los datos de prueba en el mercado farmacéutico no debe ser un impedimento para firmar el TLC con los EEUU?

    OpenAIRE

    Janice Seinfeld; Karlos La Serna

    2005-01-01

    "El objetivo del presente trabajo es comentar en detalle los tres estudios que evalúan el impacto de la protección de datos de prueba en el mercado de medicamentos peruano. A la luz de los resultados obtenidos, se proponen recomendaciones de política que el gobierno debe llevar a cabo para mejorar el acceso de la población a los medicamentos, sin poner en juego la firma del Tratado de Libre Comercio (TLC) con EE.UU., acuerdo que permitirá mayor crecimiento de la economía y la consecuente mejo...

  16. Current and potential ant impacts in the Pacific region

    Science.gov (United States)

    Loope, Lloyd L.; Krushelnycky, Paul D.

    2007-01-01

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

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

    African Journals Online (AJOL)

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

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

    African Journals Online (AJOL)

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

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

    African Journals Online (AJOL)

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

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

    African Journals Online (AJOL)

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

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

    African Journals Online (AJOL)

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

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

    NARCIS (Netherlands)

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

    2014-01-01

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

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

    NARCIS (Netherlands)

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

    2007-01-01

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

  4. 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.

  5. In vitro studies of ante-mortem proliferation kinetics

    International Nuclear Information System (INIS)

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

    1986-01-01

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

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

    DEFF Research Database (Denmark)

    Nygaard, Sanne; Hu, Haofu; Li, Cai

    2016-01-01

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

  7. 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.

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

    NARCIS (Netherlands)

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

    2015-01-01

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

  9. ADAPTIVE ANT COLONY OPTIMIZATION BASED GRADIENT FOR EDGE DETECTION

    Directory of Open Access Journals (Sweden)

    Febri Liantoni

    2014-08-01

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

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

    DEFF Research Database (Denmark)

    Villesen, Palle; Boomsma, JJ

    2003-01-01

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

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

    Directory of Open Access Journals (Sweden)

    Adam Salyer

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

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

    DEFF Research Database (Denmark)

    Kirkegaard, Nina

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

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

    DEFF Research Database (Denmark)

    Poulsen, Michael; Sapountzis, Panagiotis

    2012-01-01

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

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

    Science.gov (United States)

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

    2011-01-01

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

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

    Science.gov (United States)

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

    2009-07-01

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

  16. ANT International chemistry update and best practices

    International Nuclear Information System (INIS)

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

    2010-01-01

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

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

    Directory of Open Access Journals (Sweden)

    Balaji Prabhakar

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

  18. Saberes necessários ao profissional da educação infantil: a docência em educação física - Knowledge necessary for professional child education: teaching in physical education

    Directory of Open Access Journals (Sweden)

    Alexandre Freitas Marchiori

    2013-06-01

    Full Text Available http://dx.doi.org/10.5007/1980-4512.2013n28p96   O presente trabalho corresponde a um ensaio apresentado em 2007 no I Seminário de Práticas dos Dinamizadores de Educação Física e Artes da SEME. O texto apresenta uma estrutura objetiva, pontual. A intenção dos autores era realmente pontuar saberes advindos da prática docente no cotidiano da Educação Infantil, observados empiricamente. O conceito de saber docente desenvolvido por Tardif (2003 e outros autores ainda não faziam parte da formação dos autores. A epígrafe corresponde a uma carta circulada no CMEI “SP”, tendo em vista as condições sociais da região atendida. Trata-se de um bairro antigo, na parte alta da Grande Santo Antônio, com problemas sociais crônicos (tráfico de drogas, homicídio, prostituição, alcoolismo, pobreza e outros. Aborda-se a prática docente em Educação física na Educação Infantil e as condições de constituição docente. Os autores não possuíam nenhuma experiência com a primeira etapa da educação básica, restando-lhes as experiências advindas da vida familiar com as filhas. Houve dificuldade de encontrar aporte teórico para o fazer docente, tendo em vista a experiência de Vitória ter iniciado em abril de 2006 e não encontrar divulgação de trabalhos concretizados na área específica. Objetivo do ensaio era compartilhar as práticas com os demais dinamizadores e começar a sistematizar alguns conceitos sobre a Educação Física na Educação Infantil. Palavras chaves: Educação Física; Educação Infantil; Saberes docentes. ABSTRACT This work corresponds to a paper presented at the 2007 Seminar on Dinamizadores Practices for Physical Education and Arts at SEME. The paper presents an objective structure, punctual. The authors' intent was really to score knowledge originated from the teaching practice in everyday kindergarten, observed empirically. The concept of teacher knowledge developed by Tardif (2003 and others were

  19. "Artículo 67: educación es un derecho de la persona y un servicio público con una función social". Saberes técnicos y saberes políticos sobre la Educación en Colombia. 1978 - 1994

    OpenAIRE

    Heredia Duarte, María Isabel

    2012-01-01

    "Artículo 67: La educación es... un derecho de la persona y un servicio público con una función social Saberes técnicos y saberes políticos sobre la Educación en Colombia 1978 - 1994" es un trabajo de investigación que tiene como propósito: analizar desde la perspectiva histórica, los juegos de relaciones de saber-poder que entablaron los saberes políticos y técnicos, presentes en las expresiones escritas en las revistas sobre Educación en Colombia en el período comprendido entre 1978 a 1994....

  20. Escuela, conocimiento y saber NASA. Aspectos críticos para una política educativa intercultural en Colombia

    Directory of Open Access Journals (Sweden)

    Víctor Alonso Molina Bedoya

    2015-09-01

    Full Text Available El artículo presenta los resultados alusivos a la educación, el saber y el conocer de la investigación: “Cosmovisión de la unidad en un territorio indígena de Colombia”. El proyecto tuvo como propósito reconocer las relaciones entre el ocio, la producción, la educación y el desarrollo sostenible y se realizó a partir de un ejercicio etnográfico, a la manera de un oficiar el sentido y la mirada para explorar las tramas de sentido cultural de la comunidad. Lo que implicó una estadía en el resguardo indígena por más de 180 días, durante los cuales se realizó observación de diversas prácticas cotidianas y entrevistas semi-estructuradas que fueron registradas en el diario de campo. El análisis se hizo a partir del método de comparación constante. Como resultados se destacan: la tensión entre las prácticas educativas propias y el interés integracionista de la educación oficial. Al igual que el deseo de las comunidades por consolidar sus procesos formativos desde una relación respetuosa de los saberes, los seres y de lo social. A manera de conclusión se manifiesta quees necesario avanzar en la construcción de proyectos educativos simétricos que permitan el diálogo de seres y de saberes para edificar la nación diversa, como está plasmado en la Constitución Política de 1991 donde se reconoce a Colombia como una nación multicultural y pluriétnica.

  1. SABERES E PRÁTICAS DOCENTES E ENSINO DE HISTÓRIA: TEMAS, CONCEITOS E REFERENCIAIS (1970-2014

    Directory of Open Access Journals (Sweden)

    Nadia Gaiofatto Gonçalves

    Full Text Available RESUMO: Este trabalho visa analisar a produção acadêmica sobre Saberes e Práticas Docentes relacionadas ao Ensino de História, presente em periódicos acadêmicos das áreas de Educação, Ensino e História, no período de 1970 a 2014, buscando-se evidenciar temas, conceitos e referenciais contemplados. Como principais referenciais, utilizam-se os conceitos de habitus e campo, de Pierre Bourdieu, e de representações e lutas de representações, de Roger Chartier. Como principais resultados, destacam-se a grande concentração da produção a partir do século XXI; a coincidência de aumento de artigos com a produção específica de saberes e práticas docentes no Brasil; a presença de conceitos relacionados a saberes e práticas docentes em significativa parte da produção, mas também artigos sem a explicitação de conceitos específicos a essa problematização; e a luta de representações que se desenha, com a entrada de trabalhos relacionados à perspectiva da Educação Histórica, para abordagem da temática no campo Ensino de História.

  2. PRINCIPIOS EPISTEMOLÓGICOS Y AXIOLÓGICOS DEL SABER DOCENTE EN LA ENSEÑANZA DEL INGLÉS

    Directory of Open Access Journals (Sweden)

    Gustavo Córdoba González

    2010-01-01

    Full Text Available El presente artículo es resultado de una investigación etnográfica desarrolla con cuatro profesores de inglés que laboran en diferentes colegios rurales de la región de San Ramón, Alajuela, Costa Rica. El objetivo principal de este trabajo es analizar los principios epistemológicos y axiológicos del saber docente en la enseñanza del inglés. Los datos fueron obtenidos mediante entrevistas semiestructuradas y estructuradas aplicadas a los sujetos de investigación, así como mediante observaciones participantes y no participantes. Los resultados evidencian la configuración de cuatro dominios principales: el contenido-técnico, el metodológico, el legal-institucional y el económico. Estos dominios fungen como agentes reguladores y moldeadores de la práctica y del saber docente. La transcendencia de estos dominios del saber demuestra una preocupación fundamental sobre aspectos técnicos lingüísticos y metodológicos, conocimientos administrativos y legales en lo que respecta al valor y ejercicio de la enseñanza y aprendizaje del inglés. Finalmente, el valor y la importancia de enseñar y aprender inglés se percibe exclusivamente en términos económicos como un valor agregado de las habilidades y competencias que un individuo puede ofrecer en el mercado laboral.

  3. 15 years of VLT/UVES OH intensities and temperatures in comparison with TIMED/SABER data

    Science.gov (United States)

    Noll, Stefan; Kimeswenger, Stefan; Proxauf, Bastian; Unterguggenberger, Stefanie; Kausch, Wolfgang; Jones, Amy M.

    2017-10-01

    The high-resolution echelle spectrograph UVES of the Very Large Telescope at Cerro Paranal in Chile has been regularly operated since April 2000. Thus, UVES archival data originally taken for astronomical projects but also including sky emission can be used to study airglow variations on a time scale longer than a solar cycle. Focusing on OH emission and observations until March 2015, we considered about 3000 high-quality spectra from two instrumental set-ups centred on 760 and 860 nm, which cover about 380 nm each. These data allowed us to measure line intensities for several OH bands in order to derive band intensities and rotational temperatures for different upper vibrational levels as a function of solar activity and observing date. The results were compared with those derived from emission and temperature profile data of the radiometer SABER on the TIMED satellite taken in the Cerro Paranal area between 2002 and 2015. In agreement with the SABER data, the long-term variations in OH intensity and temperature derived from the UVES data are dominated by the solar cycle, whereas secular trends appear to be negligible. Combining the UVES and SABER results, the solar cycle effects for the OH intensity and temperature are about 12-17% and 4-5 K per 100 sfu and do not significantly depend on the selected OH band. The data also reveal that variations of the effective OH emission layer height and air density can cause significant changes in the OH rotational temperatures due to a varying ratio of OH thermalising collisions by air molecules and OH radiation, deactivation, and destruction processes which impede the rotational relaxation. However, this effect appears to be of minor importance for the explanation of the rotational temperature variations related to the solar activity cycle, which causes only small changes in the OH emission profile.

  4. Daily estimates of the migrating tide and zonal mean temperature in the mesosphere and lower thermosphere derived from SABER data

    Science.gov (United States)

    Ortland, David A.

    2017-04-01

    Satellites provide a global view of the structure in the fields that they measure. In the mesosphere and lower thermosphere, the dominant features in these fields at low zonal wave number are contained in the zonal mean, quasi-stationary planetary waves, and tide components. Due to the nature of the satellite sampling pattern, stationary, diurnal, and semidiurnal components are aliased and spectral methods are typically unable to separate the aliased waves over short time periods. This paper presents a data processing scheme that is able to recover the daily structure of these waves and the zonal mean state. The method is validated by using simulated data constructed from a mechanistic model, and then applied to Sounding of the Atmosphere using Broadband Emission Radiometry (SABER) temperature measurements. The migrating diurnal tide extracted from SABER temperatures for 2009 has a seasonal variability with peak amplitude (20 K at 95 km) in February and March and minimum amplitude (less than 5 K at 95 km) in early June and early December. Higher frequency variability includes a change in vertical structure and amplitude during the major stratospheric warming in January. The migrating semidiurnal tide extracted from SABER has variability on a monthly time scale during January through March, minimum amplitude in April, and largest steady amplitudes from May through September. Modeling experiments were performed that show that much of the variability on seasonal time scales in the migrating tides is due to changes in the mean flow structure and the superposition of the tidal responses to water vapor heating in the troposphere and ozone heating in the stratosphere and lower mesosphere.

  5. Las ciencias sociales como integración de saberes en la dimensión humana

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    Joaquín Molano Barrero

    2007-01-01

    Full Text Available La institucionalidad de la ciencia está ligada a nuestra dependencia y nuestra miseria. Tiene su proyección en la investigación, la docencia, el control geopolítico, y la expropiación de nuestros recursos. Se analizan las ciencias sociales en relación con las demás disciplinas y saberes, tomando como elemento de convergencia la dimensión humana. La reflexión sugiere ideas para abordar la naturaleza de lo humano en relación con los otros y con lo otro. Invita a pensar la vida personal y colectiva desde las instancias profundas de la sabiduría y la espiritualidad. Esta intencionalidad surge debido a las dificultades que han padecido las ciencias sociales dentro del paradigma científico de la modernidad. No vale la pena continuar inscribiendo el saber social en el marco de la formalización de la ciencia. Eello ha demandado costos muy altos como la pérdida de la ancestralidad, la identidad y la construcción de escenarios de vida y libertad. La ciencia ha cerrado el horizonte de lo social, ha fragmentado los saberes y ha proyectado un vacío de humanidad. Las humanidades convocan a la ciencia y a las ciencias sociales a crear nuevas realidades e imaginarios de lo social, con una actitud crítica y con valores esenciales. Lo social es imprescindible en la educación y hace parte del compromiso de toda acción pedagógica, consistente en asumir conscientemente la vida para crear entre nosotros una existencia con sentido de pertenencia y de humanidad. Imposible crecer sin una buena dosis de justicia, de sabiduría, de alimento (amor y de autoconocimiento

  6. Teoría emergente en la construcción del saber pedagógico

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    Víctor Díaz Quero

    2004-05-01

    Full Text Available Explicar la construcción y reconstrucción del saber pedagógico de los docentes, desde las perspectivas de su formación y experiencia constituyó el propósito de este trabajo. La naturaleza de la investigación refiere la subjetividad como fuente de conocimiento y componente dimensional de lo humano. El método tilizado fue la etnometodología para evidenciar la acción del hombre y de los significados que da a su propia actividad. Se seleccionaron (6 seis docentes de manera intencional, quienes participaron como sujetos que construyen y reconstruyen sus prácticas como instancia de la construcción de su saber. Los datos fueron obtenidos a través de la entrevista semiestructurada, con base en tres criterios: (a grado de apertura. (b grado de socialización y (c área de interés. El análisis de esta información, permitió su organización en una red conceptual constituida por unidades de información, categorías, tipologías y conceptos integradores que logran configurar la teoría emergente a partir de la reflexión del docente, sobre y desde sus prácticas. Los resultados obtenidos revelan como uno de los principales hallazgos, la existencia en los docentes de un pensamiento disociado entre teoría y práctica y una teoría que define epistemológicamente al saber pedagógico como un proceso complejo y permanente.

  7. O uso do saber estatístico nos discursos acadêmicos da alfabetização

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    Renata Sperrhake

    2012-01-01

    Full Text Available O presente texto analisa como os discursos da alfabetização, do analfabetismo e do alfabetismo/letramento utilizam o saber estatístico. Para tanto, realizou-se uma busca em acervos digitais de revistas especializadas em Educação e Estatística e no Portal de Teses da CAPES. A partir do corpus selecionado, é possível perceber as seguintes formas de utilização: 1 estatísticas utilizadas como material empírico; 2 estatísticas utilizadas como procedimento metodológico; 3 referência ao saber estatístico. Além de mostrar como o saber estatístico é utilizado, a análise das produções acadêmicas nos fez perceber outros dois pontos: o aparecimento de níveis de alfabetismo/letramento; e uma mudança quanto à forma de entender a relação do sujeito com a leitura e a escrita.Abstract The present paper analyzes how discourses of literacy, illiteracy and alphabetic literacy have used statistical knowledge. We carried out a search into digital files of journals specialized in Education and Statistics, as well as into CAPES Thesis Database. From the selected corpus, it is possible to perceive the following kinds of uses: 1 statistics used as empirical material; 2 statistics used as methodological procedure; 3 reference to statistical knowledge. Besides evidencing how the statistical knowledge has been used, the analysis of academic productions has enabled us to perceive other two points: the appearance of levels of alphabetic literacy, and the change in the understanding of the relationship of the subject with reading and writing.

  8. 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...

  9. Ex-ante Evaluation von Investitionsalternativen

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    Matthias Müller

    2017-12-01

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

  10. Swarm controlled emergence for ant clustering

    DEFF Research Database (Denmark)

    Scheidler, Alexander; Merkle, Daniel; Middendorf, Martin

    2013-01-01

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

  11. Discrimination Behavior in the Supercolonial Pharaoh Ant

    DEFF Research Database (Denmark)

    Pontieri, Luigi

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

  12. New nighttime retrievals of O(3P) and OH densities in the mesosphere/lower thermosphere using SABER/TIMED observations

    Science.gov (United States)

    Panka, P.; Kutepov, A. A.; Kalogerakis, K. S.; Janches, D.; Feofilov, A.; Rezac, L.; Marsh, D. R.; Yigit, E.

    2017-12-01

    We present first retrievals of O(3P) and OH densities in the mesosphere/lower thermosphere (MLT) using SABER/TIMED OH 2.0 and 1.6 μm limb emission observations. Recently, Kaufmann et al. [2014] reported that current SABER O(3P) densities are on average 30% higher compared to other observations. In this study we applied new detailed non-LTE model [Panka et al. 2017] of nighttime OH(v), which accounts for the new mechanism OH(v≥5)+O(3P)→O(1D)+OH(v-5) of energy transfer recently suggested by Sharma et al. [2015] and confirmed through laboratory studies by Kalogerakis et al. [2016]. Based on this model we developed a new self-consistent two channel retrieval approach for O(3P) and OH density. Using this approach, we retrieved O(3P) densities that are 10-40% lower than current SABER O(3P), as well as total OH density which is retrieved for the first time using SABER observations. We compare our retrieveals with the results of other observations and models. As it was recently shown by Panka et al. [2017], the new mechanism of OH quenching produces a significant pumping of CO2 4.3 µm emission. We discuss the effects these new O(3P) and OH retrievals have on the nighttime CO2 density retrievals from the SABER 4.3 µm channel.

  13. O SABER MÉDICO NA DIALÉTICA DA SALVAÇÃO: controle e utopia do poder medicalizante

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    André Sousa Trindade

    2016-07-01

    Full Text Available O presente artigo utiliza como fundamento teórico a análise sobre o saber médico realizada no livro de Michel Foucault O nascimento da clínica e a conferência de 1974, A crise da medicina ou antimedicina. A priori, partirei das seguintes premissas: a construção hegemônica do saber médico a partir do fim do século XVIII; e do poder que a medicina através do saber médico passou a exercer sobre os corpos doentes e não-doentes, alterando assim, a própria estrutura da vida, forçando os corpos à uma reconfiguração de corporeidade vigente na modernidade. Em suma, analisaremos o saber médico frente ao seu processo histórico e como esse saber apropriou-se de áreas externas à medicina influenciando diretamente na criação de políticas públicas, e na própria economia. É de vital interesse objetivar e problematizar todo o arcabouço medicinal, e mostrar uma dualidade nociva, de interesses políticos e econômicos, que são adeptos de uma dialética constante entre salvação, controle e utopia da vida. Palavras-chave: Foucault; Medicina; Saber médico; Corpo.   MEDICAL KNOWLEDGE IN THE DIALECTIC OF SALVATION: Control and utopia of medicalizante power ABSTRACT This article uses the theoretical basis for analysis of medical know held in Michel Foucault's book The Birth of the Clinic and the 1974 conference, The crisis of medicine or antimedicina. A priori, leave the following assumptions: the hegemonic construction of medical knowledge from the late eighteenth century; and power that medicine through medical know began to exert on sick bodies and non-patients, thus changing the very structure of life, forcing the body to a reconfiguration of the current embodiment of modernity. In short, we analyze medical know against its historical process and how this know appropriated outdoors medicine directly influencing the creation of public policies, and the economy itself. It is of vital interest to objectify and discuss all the medical

  14. La perspectiva biográfica. El proceso de construcción del saber pedagógico

    OpenAIRE

    Sotos Serrano, María; López Esteban, Carmen; Sánchez García, Ana Belén

    2016-01-01

    El objetivo principal de este trabajo consiste en analizar si la perspectiva biográfica, mediante los relatos de vida, permite analizar los procesos de construcción del saber pedagógico de las/os docentes, ya que pensamos que la formación docente supera los límites estrictos de los períodos de formación reglada. También se presentan algunos de los objetivos que justifican este tipo de estudios y, finalmente, se defiende la tesis de que la perspectiva biográfica es la que permite cumplir con e...

  15. Currículos disciplinares na área de saúde: ensaio sobre saber e poder

    OpenAIRE

    Verônica Santos Albuquerque; Rodrigo Siqueira Batista; Suzelaine Tanji; Edneia Tayt-Sohn Martuchelli Moço

    2009-01-01

    O presente artigo traz uma revisão histórica sobre a construção do conhecimento e do poder a partir da organização disciplinar como base para a discussão do confinamento do saber em disciplinas na formação dos profissionais de saúde e suas consequências nos modos de produzir atenção à saúde. Ato contínuo, propõe a interdisciplinaridade, a transdisciplinaridade e o pensamento complexo como referenciais teóricos para ultrapassagem da lógica disciplinar.

  16. Currículos disciplinares na área de saúde: ensaio sobre saber e poder

    Directory of Open Access Journals (Sweden)

    Verônica Santos Albuquerque

    2009-12-01

    Full Text Available O presente artigo traz uma revisão histórica sobre a construção do conhecimento e do poder a partir da organização disciplinar como base para a discussão do confinamento do saber em disciplinas na formação dos profissionais de saúde e suas consequências nos modos de produzir atenção à saúde. Ato contínuo, propõe a interdisciplinaridade, a transdisciplinaridade e o pensamento complexo como referenciais teóricos para ultrapassagem da lógica disciplinar.

  17. Plagas, enfermedades y saberes agrícolas en el Caribe, un estudio de caso

    Directory of Open Access Journals (Sweden)

    Fernández Prieto, Leida

    2011-08-01

    Full Text Available From the new approaches in social studies of science and technology concerned with the analysis of sites where science is developed and how it circulates, I am interested to observe the Caribbean as an island-center in the tropical agronomic knowledge development. For this, I study how the scientific steps were formulated to eradicate the plagues that currently affect more intensely coconut plantations in the Caribbean and Latin America, called Lethal Yellowing Disease of Coconut, which has destroyed the industry crops in many areas. The epidemic first appeared in the nineteenth century in the Caribbean Antilles, which forced local scientists to develop a database of global knowledge. In particular, I observe the process in Cuba from scientific discussions generated at the Royal Academy of Medical Sciences, Physical and Natural Sciences of Havana, as well as the entry of U.S. scientists in the new imperial context of early twentieth century, who expanded their field of study throughout the English and Spanish Caribbean through the exchange of ideas and experiences.

    A partir de los nuevos enfoques en los estudios sociales de la ciencia y la tecnología interesados en el análisis de los sitios donde se produce la ciencia y cómo circula, me interesa observar el Caribe como isla-centro en la construcción del saber agronómico tropical. Para ello estudio cómo se fueron formulando científicamente los pasos a seguir para erradicar una de las plagas que actualmente afectan con más intensidad las plantaciones de cocos del Caribe y América Latina, llamada Amarillamiento Letal del Cocotero (ALC, la cual ha destruido la industria de la copra en muchas zonas productoras. La epidemia apareció por vez primera en el siglo XIX en el Caribe antillano, donde obligó a los científicos locales a elaborar un sistema de conocimiento global. En particular, observo ese proceso en Cuba a partir de los debates científicos generados en la Real

  18. LA EMERGENCIA DE LOS NUEVOS SABERES GEOGRÁFICOS ESCOLARES: pensamientos visuales y narrativos

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    María Alejandra Taborda Caro

    2013-12-01

    Full Text Available RESUMEN: El saber escolar geográfico está siendo sometido a innumerables cambios. En algunos países se ha localizado dentro de las ciencias sociales, en otros está siendo integrado a los estudios ambientales, movimientos que lo están llevando a una pérdida de identidad. En pocos casos se mantiene de manera autónoma en el currículo escolar. Por otro lado, la geografía como disciplina está siendo tensionada por innumerables mudanzas que colocan en cuestión sus categorías paisaje, territorio, lugar y espacio. Sin embargo, la didáctica de la geografía en América Latina, a través de la Red Latinoamericana de Investigadores en Didáctica de la Geografía –REDLADGEO- y la RED IMAGENS, GEOGRAFIAS E EDUCAÇÃO, se encuentra configurando un campo intelectual de la pedagogía que, además de producir reflexiones sobre la enseñanza, está generando aportes a la misma geografía. RESUMO: O conhecimento geográfico escolar hoje está passando por muitas mudanças. Em alguns países, foi localizado dentro das ciências sociais, em outros, está sendo integrado a estudos ambientais, perdendo identidade em ambos os casos. Raramente é mantido autonomamente no currículo escolar. Assim, a geografia, como disciplina, está sendo tensionada por mudanças que colocam em questão suas categorias - paisagem, território, lugar e espaço. A despeito disto, pesquisadores que trabalham na Red Latinoamericana de Investigadores en Didáctica de la Geografía –REDLADGEO na RED IMAGENS, GEOGRAFIAS E EDUCAÇÃO - estão criando um campo intelectual de produção de reflexões, que além de produzir reflexões sobre contribuições de ensino, está gerando produção de geografia como ciência.

  19. 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.

  20. The diversity of microorganisms associated with Acromyrmex leafcutter ants

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    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.

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

    Energy Technology Data Exchange (ETDEWEB)

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

    2007-01-12

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

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

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    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.

  3. Competitive assembly of South Pacific invasive ant communities

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    Sarty Megan

    2009-01-01

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

  4. Experiência e competência no ensino: pistas de reflexões sobre a natureza do saber-ensinar na perspectiva da ergonomia do trabalho docente

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    THERRIEN JACQUES

    2001-01-01

    Full Text Available O texto propõe-se a desenvolver uma reflexão sobre um campo de investigação emergente e necessário para a compreensão do significado da experiência no saber-ensinar: o trabalho docente segundo a perspectiva da ergonomia, inspirada na cognição situada. Contextualizando os novos contornos da política educacional brasileira no cenário das reformas educacionais, o estudo privilegia o debate sobre a formação docente e suas atuais tendências. A reflexão traz elementos conceituais e teórico-metodológicos destinados à investigação da natureza do saber-ensinar, focalizando o estudo da competência no ensino no contexto dos saberes na base da prática docente.

  5. El médico de la familia ante un suceso del ciclo vital: la entrada en la escuela

    Directory of Open Access Journals (Sweden)

    Dolores de la Cuesta Freijomil

    1997-04-01

    Full Text Available Se expresan las características generales de la etapa escolar, así como los requisitos de madurez que debe cumplir el niño para su ingreso en la escuela. Se destaca la función orientadora del médico de la familia ante este suceso, y la necesidad de utilizar adecuadamente la etapa preescolar como estadio de preparación de la etapa siguiente. Se proponen acciones para que el médico de la familia se desarrolle con vistas a incidir positivamente en la salud del escolar y la familia.The general characteristics of the school period, as well as the maturity requirements children should meet to enter school are expressed here. The orienting function of the family physician on this regard and the need to use the preschool period adequately as a preparatory step for the next one are also stressed. Some actions are proposed to be developed by the family physician in order to influence positively on the school children's health and family.

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

    Directory of Open Access Journals (Sweden)

    Marina Sánchez-Sanabria

    2009-12-01

    Full Text Available La misión educativa institucional es cada vez mas imposible de lograr ante los problemas de violencia intrafamiliar y escolar, situación que es retomada por el grupo de investigación Control de Calidad de los Procesos en Salud para promover el entorno cultural saludable en la promoción de la Resiliencia que incida en la adopción de comportamientos saludables y prósperos. El estudio se realizó en una escuela de la comuna cinco de Valledupar-Colombia. Es una investigación cualitativa etnográfico con diseño de “Grupo Focal,” para analizar todo el contexto del escolar afectado en las áreas social, afectiva y personal permitiendo develar el dignificado de la Resiliencia El rol de enfermería comunitaria debe favorecer el desarrollo de la capacidad humana del niño que vive en violencia continua para enfrentar, sobreponerse y ser fortalecido o transformado por las experiencias de adversidad” (Grotberg, 1995, como tema central del presente estudio, precisando posibles mecanismos que apuntaron al desarrollo de la autonomía para su autocuidado y adaptación de la disciplina, la mediación, la competencia social, entre las más relevantes , favorece la funcionalidad del hogar, entornos saludables y escuela saludable por parte de un equipo transdisciplinar.

  7. Propuesta de infraestructura técnica de seguridad para un Equipo de Respuesta ante Incidentes de Seguridad (CSIRT

    Directory of Open Access Journals (Sweden)

    Heltton Emmanuel Ramírez Luna

    2015-02-01

    Full Text Available En este artículo se describe una propuesta creada para proteger la información y la infraestructura de un equipo de respuestas ante incidentes de seguridad (CSIRT, el cual es una organización dedicada a dar respuesta a incidencias de seguridad en tecnologías de la información. Un CSIRT está conformado por un grupo de expertos en seguridad de la información la cual provee de servicios como alertas y advertencias, tratamiento de incidentes, observatorio de tecnología, auditorías de seguridad, cómputo forense, entre otros. Por lo tanto, se hace uso de información sensible como datos de usuarios y de empresas que deberá tener fuertes métodos de seguridad. En este artículo se aborda una propuesta de los aspectos de seguridad que debe tener un CSIRT abarcando las áreas de Telecomunicaciones, Equipo hardware y Sistemas SIEM (Security Information and Event Management. Esta propuesta no toma en consideración la tipología en la que un CSIRT puede establecerse.

  8. De Florence Nightingale às perspectivas atuais sobre o cuidado de enfermagem: a evolução de um saber/fazer Desde Florence Nightingale a las perspectivas actuales sobre el cuidado en enfermería: la evolución del saber/hacer From Florence Nightingale to the current perspectives about nursing care: the evolution of a know-how

    Directory of Open Access Journals (Sweden)

    Fátima Helena do Espírito Santo

    2006-12-01

    Full Text Available O trabalho apresenta uma reflexão teórica sobre a evolução do cuidado de enfermagem a partir dos princípios nightingaleanos confrontados com as perspectivas atuais de alguns autores que vem abordando essa temática. Concluímos que as bases sólidas fincadas por Florence Nightingale estão permitindo à Enfermagem avançar em estudos que legitimam e fundamentam o cuidado enquanto essência do saber e fazer de enfermeiras e enfermeiros nos seus vários campos de atuação. Atualmente esses estudos apontam o cuidado como objeto de teorização em dimensões que aliam aspectos internos e externos à profissão, inserindo e explorando temas que antes eram velados, embora presentes no cotidiano da nossa prática, como o significado do corpo e suas formas de expressão na interação entre quem cuida e é cuidado.El trabajo presenta una reflexión teórica sobre la evolución del cuidado en el oficio de enfermeros a partir de los principios Nightingaleanos confrontados con las perspectivas actuales de algunos autores que vienen abordando esa temática. Concluimos que las bases sólidas lanzadas por Florence Nightingale están permitiendo al oficio de enfermeros avanzar en estudios que legitiman y fundamentan el cuidado en cuanto esencia del saber y hacer de las enfermeras y enfermeros en sus variados campos de actuación. Actualmente eses estudios indican el cuidado como objeto de teoría en dimensiones que alían aspectos internos y externos a la profesión, proponiendo y explorando temas que antes eran velados aunque presentes en el cotidiano de nuestra práctica como el significado del cuerpo y sus formas de expresión en la interacción entre quien cuida y quien es cuidado.The work presents a theoretical observation on the evolution of the nursing care from the Nightingalean principles faced to the current perspectives of some authors that approach this subject. We concluded that the solid base proposed by Florence Nightingale allow to

  9. Evolution of Fungal enzymes in the attine ant symbiosis

    DEFF Research Database (Denmark)

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

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

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

    DEFF Research Database (Denmark)

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

    2009-01-01

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

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

    Science.gov (United States)

    Xiao, Xiaoxu

    2018-04-01

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

  12. Ant colony algorithm for clustering in portfolio optimization

    Science.gov (United States)

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

    2018-03-01

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

  13. Automating ActionScript Projects with Eclipse and Ant

    CERN Document Server

    Koning, Sidney

    2011-01-01

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

  14. The invasion biology and sociogenetics of pharaoh ants

    DEFF Research Database (Denmark)

    Schmidt, Anna Mosegaard

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

  15. Saberes e práticas de enfermeiros sobre a participação social na saúde

    Directory of Open Access Journals (Sweden)

    Deíse Moura de Oliveira

    2016-06-01

    Full Text Available RESUMO Objetivo: identificar os saberes e práticas do enfermeiro da Estratégia Saúde da Família com relação à participação social na saúde. Método: pesquisa de natureza qualitativa que teve como cenário as Unidades de Saúde da Família de um município de Minas Gerais. Participaram nove enfermeiros, entrevistados individualmente, nos meses de julho e agosto de 2014. Os dados coletados foram analisados segundo a técnica de análise de conteúdo e interpretados à luz da ontologia e pedagogia freireana. Resultados: os depoimentos analisados evidenciaram que os enfermeiros trazem incoerências conceituais e também atitudinais que necessitam ser equalizadas, a fim de que os seus saberes e práticas possam mediar a desafiadora construção da gestão participativa na saúde. Conclusão: sugere-se um incremento na formação do enfermeiro, tanto acadêmica quanto em serviço, no sentido de fortalecer o seu papel político no processo de consolidação da participação social no Sistema Único de Saúde.

  16. Water Vapor, Temperature, and Ice Particles in Polar Mesosphere as Measured by SABER/TIMED and OSIRIS/Odin Instruments

    Science.gov (United States)

    Feofilov, A. G.; Petelina, S. V.; Kutepov, A. A.; Pesnell, W. D.; Goldberg, R. A.

    2009-01-01

    Although many new details on the properties of mesospheric ice particles that farm Polar Mesospheric Clouds (PMCs) and also cause polar mesospheric summer echoes have been recently revealed, certain aspects of mesospheric ice microphysics and dynamics still remain open. The detailed relation between PMC parameters and properties of their environment, as well as interseasonal and interhemispheric differences and trends in PMC properties that are possibly related to global change, are among those open questions. In this work, mesospheric temperature and water vapor concentration measured by the Sounding of the Atmosphere using Broadband Emission Radiometry (SABER) instrument on board the Thermosphere Ionosphere Mesosphere Energetics and Dynamics (TIMED) satellite are used to study the properties of PMCs with respect to the surrounding atmosphere. The cloud parameters, namely location, brightness, and altitude, are obtained from the observations made by the Optical Spectrograph and Infrared Imager System (OSIRIS) on the Odin satellite. About a thousand of simultaneous common volume measurements made by SABER and OSIRIS in both hemispheres from 2002 until 2008 are used. The correlation between PMC brightness (and occurrence rate) and temperatures at PMC altitudes and at the mesopause is analysed. The relation between PMC parameters, frost point temperature, and gaseous water vapor content in and below the cloud is also discussed. Interseasonal and interhemispheric differences and trends in the above parameters, as well as in PMC peak altitudes and mesopause altitudes are evaluated.

  17. Storm-time variation of radiative cooling by Nitric Oxide as observed by TIMED-SABER and GUVI

    Science.gov (United States)

    Sunil Krishna, M. V.; Bharti, G.; Bag, T.

    2017-12-01

    The variation of O/N2 and nitric oxide radiative emission flux exiting thermosphere have been studied over northern hemisphere during the super-storm event of November 7-12, 2004. The data have been obtained from GUVI and SABER onboard the NASA's TIMED satellite. The NO radiative flux is observed to show an anti-correlation with O/N2 on a global scale. Both NO radiative flux and O/N2 ratio show equatorward motion with maximum penetration in western longitude sectors. A local variation of O, O2 and N2 densities have been calculated by using NRLMSISE-00 model over a mid-latitude location (55oN,180oE). On a local scale, model calculated O/O2 and O/N2 ratios are found to follow the observations made by GUVI. The SABER retrieved NO cooling rate (CR) at a local site suggests an enhancement during the storm period with the peak emission rate closely correlated to the progression of the storm. The peak emission altitude of NO CR moves upward during the main phase of the storm. The NO abundance has been calculated by using cooling rate and NOEM model. Both these suggest huge increase in NO density during the storm which is required to account the changes in NO radiative flux.

  18. Inter-Hemispheric Coupling During Northern Polar Summer Periods of 2002-2010 using TIMED/SABER Measurements

    Science.gov (United States)

    Goldberg, Richard A.; Feofilov, A. G.; Pesnell, W. D.; Kutepov, A. A.

    2012-01-01

    It has been found that for more than one polar summer season between 2002-2010, the northern polar mesospheric region near and above about 80 km was warmer than normal. The strongest warming effect of this type was observed to occur during northern summer 2002. Theoretical studies have implied that these "anomalies" were preceded by unusual dynamical processes in the southern hemisphere. We have analyzed temperature distributions measured by the SABER limb scanning infrared radiometer aboard the NASA TIMED satellite between 2002-2010 at altitudes from 15 to 110 km and for latitudes between 83 S to 83 N. We describe the approach to trace the inter-hemispheric temperature correlations demonstrating the global features that were unique for the "anomalous" northern polar summers. From our analysis of SABER data from 2002-2010, the anomalous heating for the northern mesopause region during northern summer was accompanied by stratospheric heating in the equatorial region. In the winter hemisphere it is accompanied by heating in the lower stratosphere and mesopause region, and cooling in the stratopause region. Also, all the elements of the temperature anomaly structure appear to develop and fade away nearly simultaneously, thereby suggesting either a global influence or a rapid exchange.

  19. The European saber-toothed cat (Homotherium latidens) found in the "Spear Horizon" at Schöningen (Germany).

    Science.gov (United States)

    Serangeli, Jordi; Van Kolfschoten, Thijs; Starkovich, Britt M; Verheijen, Ivo

    2015-12-01

    The 300,000 year old Lower Paleolithic site Schöningen 13 II-4 became world famous with the discovery of the oldest well-preserved and complete wooden spears. Through ongoing excavations, new archaeological discoveries of scientific importance are still being made from the same archaeological layer where the spears were found. In this context, remains of a rare carnivore species, the European saber-toothed cat (Homotherium latidens), were recovered. Here we present five teeth and one humerus fragment that are unambiguously from two individual saber-toothed cats. The humerus is a unique specimen; it shows evidence of hominin impacts and use as a percussor. The Homotherium remains from Schöningen are the best documented finds of this species in an archaeological setting and they are amongst the youngest specimens of Homotherium in Europe. The presence of this species as a carnivore competitor would certainly have impacted the lives of late Middle Pleistocene hominins. The discovery illustrates the possible day-to-day challenges that the Schöningen hominins would have faced and suggests that the wooden spears were not necessarily only used for hunting, but possibly also as a weapon for self-defense. Copyright © 2015 Elsevier Ltd. All rights reserved.

  20. Por um diálogo de saberes entre pescadores artesanais, marisqueiras e o direito ambiental do trabalho

    Directory of Open Access Journals (Sweden)

    Ingrid Gil Sales Carvalho

    2014-10-01

    Full Text Available O diálogo de saberes entre pescadores artesanais e marisqueiras sobre o direito a um meio ambiente de trabalho saudável se estabelece como um novo processo de reivindicação para as melhorias das condições de trabalho de populações afetadas por problemas ambientais em geral, e especialmente na Baía de Todos os Santos (BTS. As comunidades do entorno da BTS queixam-se ao Ministério Público Estadual dos efeitos danosos à saúde e ao ambiente das indústrias instaladas no Centro Industrial de Aratu e Porto de Aratu. Diversos pesquisadores das áreas de química, toxicologia, oceanografia, biologia e medicina da Universidade Federal da Bahia (UFBA vêm aprofundando estudos sobre os efeitos da contaminação da BTS em variadas publicações científicas. O objetivo deste artigo é refletir sobre a contribuição desse diálogo na área do direito ambiental do trabalho (DAT no Brasil. A metodologia deste estudo envolveu entrevistas semiestruturada, observação participante, análise documental. Conclui-se que legislação ambientalista/trabalhista do Brasil necessita incluir o diálogo de saberes para garantir o acesso a um meio ambiente de trabalho saudável para pescadores artesanais e marisqueiras.

  1. C02(nu2)-0 Quenching Rate Coefficient Derived from Coincidental Fort Collins Lidar and SABER Measurements

    Science.gov (United States)

    Feofilov, A. G.; Kutepov, A. A.; She, C. Y.; Smith, A. K.; Pesnell, W. D.; Goldberg, R. A.

    2009-01-01

    Among the processes governing the energy balance in the mesosphere and lower thermosphere (MLT), the quenching of CO2(V2) vibrational levels in collisions with oxygen atoms plays an important role. However, neither the rate coefficient of this process (k(CO2O)) nor the atomic oxygen concentrations ([O]) in the MLT are well known. The discrepancy between k(CO2O) measured in the lab and retrieved from atmospheric measurements is of about factor of 2.5. At the same time, the discrepancy between [O] in the MLT measured by different instruments is of the same order of magnitude. In this work we used a synergy of a ground based lidar and satellite infrared radiometer to make a further step in understanding of the physics of the region. In this study we apply the night- and daytime temperatures between 80 and 110 km measured by the Colorado State University narrow-band sodium (Na) lidar located at Fort Collins, Colorado for retrieving the product of k(CO2-O) x [O] from the limb radiances in the 15 micron channel measured by the SABER/TIMED instrument for nearly simultaneous common volume measurements of both instruments within +/-1 degree in latitude, +/-2 degrees in longitude and +/-10 minutes in time. We derive k(CO2-O) and its possible variation range from the retrieved product by utilizing the [O] values measured by the SABER and other instruments.

  2. A gestão da informação na análise de Foucault sobre as relações poder-saber

    Directory of Open Access Journals (Sweden)

    Sérgio Paulo Maravilhas-Lopes

    2013-07-01

    Full Text Available Foucault mostrou como o poder e o saber se interrelacionam e de que forma ele é exercido sobre os indivíduos na sociedade, através de tecnologias que permitem a vigilância, cada vez gerando mais saber. Tentaremos ligar a vigilância ao conhecimento e poder que permitem obter, bem como o uso de tecnologias em moldes eletrónicos para o fazer. Tendo Foucault apontado como o poder e o saber se interrelacionam e de que forma é ele exercido sobre os indivíduos na sociedade, cada vez gerando mais saber, procuraremos mostrar essas relações, objetivos dessa coerção e formas de o fazer, apelando à utilização das novas tecnologias e fazendo uso da gestão da informação para acumular e exercitar esse saber que se revelará em mais poder para quem o detém. Desde sempre o conhecimento e a informação foram uma vantagem para quem dela dispunha, a diferença é que no passado conhecíamos bem os nossos vigilantes e agora, nos nossos dias, simplesmente nem sequer sabemos por quem somos vigiados, e o poder que isso pode exercer sobre as nossas vidas. Concluiremos com uma alusão ao papel da gestão da informação na obtenção e utilização desse saber para que melhor se exerça o poder.

  3. Storm/Quiet Ratio Comparisons Between TIMED/SABER NO (sup +)(v) Volume Emission Rates and Incoherent Scatter Radar Electron Densities at E-Region Altitudes

    Science.gov (United States)

    Fernandez, J. R.; Mertens, C. J.; Bilitza, D.; Xu, X.; Russell, J. M., III; Mlynczak, M. G.

    2009-01-01

    Broadband infrared limb emission at 4.3 microns is measured by the TIMED/SABER instrument. At night, these emission observations at E-region altitudes are used to derive the so called NO+(v) Volume Emission Rate (VER). NO+(v) VER can be derived by removing the background CO2(v3) 4.3 microns radiance contribution using SABER-based non-LTE radiation transfer models, and by performing a standard Abel inversion on the residual radiance. SABER observations show that NO+(v) VER is significantly enhanced during magnetic storms in accordance with increased ionization of the neutral atmosphere by auroral electron precipitation, followed by vibrational excitation of NO+ (i.e., NO+(v)) from fast exothermic ion-neutral reactions, and prompt infrared emission at 4.3 m. Due to charge neutrality, the NO+(v) VER enhancements are highly correlated with electron density enhancements, as observed for example by Incoherent Scatter Radar (ISR). In order to characterize the response of the storm-time E-region from both SABER and ISR measurements, a Storm/Quiet ratio (SQR) quantity is defined as a function of altitude. For SABER, the SQR is the ratio of the storm-to-quiet NO+(v) VER. SQR is the storm-to-quiet ratio of electron densities for ISR. In this work, we compare SABER and ISR SQR values between 100 to 120 km. Results indicate good agreement between these measurements. SQR values are intended to be used as a correction factor to be included in an empirical storm-time correction to the International Reference Ionosphere model at E-region altitudes.

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

    Science.gov (United States)

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

    2004-10-01

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

  5. As palavras do saber e do sabor: A gastronomia como objecto de descoberta no processo de ensino / aprendizagem do PLE e PL2

    OpenAIRE

    Ferreira, Maria de Lurdes Carvalho

    2011-01-01

    Dissertação apresentada para cumprimento dos requisitos necessários à obtenção do grau de Mestre em Ensino do Português como Língua Segunda e Estrangeira Ao adquirir competências numa língua estrangeira, o aprendente acede à matriz cultural dos seus falantes. A gastronomia, enquanto saber e saber-fazer, constitui um dos traços identitários mais relevantes, uma vez que, respeitando variedades e especificidades, é sentida como um património comum. A gastronomia cruza vertentes diversas, d...

  6. Em torno de Michel Foucault e Luis Buñuel: saber e poder na análise de O Discreto Charme da Burguesia

    OpenAIRE

    Priscila Canova Motta

    2014-01-01

    O objetivo desta pesquisa é analisar o filme O Discreto Charme da Burguesia, de Luis Buñuel (1972), por meio de alguns conceitos do referencial teórico-metodológico de Michel Foucault: saber e enunciado discursivo em suas relações com o poder e verdade, e buscar compreender o poder em seu exercício no filme, e não apenas em seus efeitos. Partindo de alguns princípios sobre saber em Foucault, mapeamos um enunciado fílmico que apareceu em algumas sequências, qual seja: O barulho que oculta a di...

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

    Directory of Open Access Journals (Sweden)

    Olivier Cruz Méndez

    2001-12-01

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

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

    International Nuclear Information System (INIS)

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

    2016-01-01

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

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

    DEFF Research Database (Denmark)

    Ugelvig, Line; Drijfhout, Falko; Kronauer, Daniel

    2008-01-01

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

  10. Stealthy invaders: the biology of Cardiocondyla tramp ants

    DEFF Research Database (Denmark)

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

    2006-01-01

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

  11. In what clinical settings should Cushing´s syndrome be suspected? ¿En qué situaciones clínicas debe sospecharse un síndrome de Cushing?

    Directory of Open Access Journals (Sweden)

    Oscar D. Bruno

    2009-12-01

    casos derivados a centros especializados es sugestivo de su mayor reconocimiento por parte de médicos de diversas especialidades. Los signos del síndrome derivan de la exageración de las acciones fisiológicas del cortisol, tales como aumento del catabolismo proteico, hiperglucemia, movilización de grasas, dislipidemia, retención hidrosalina, inmunosupresión y mayor susceptibilidad a infecciones. El desarrollo rápido y sin causa aparente de obesidad troncular, cambios psicológicos, fatiga, debilidad, miopatía, fragilidad vascular, estrías rojo-vinosas, hipertensión arterial, diabetes e hiperlipidemia son signos sugestivos de diagnóstico. Desde el punto de vista epidemiológico, la existencia de este síndrome debe ser sospechada y consecuentemente buscada en pacientes con hipertensión arterial o diabetes mal controladas, síndrome metabólico, poliquistosis ovárica, osteoporosis, síndrome depresivo o incidentalomas adrenales. El verdadero síndrome de Cushing debe ser diferenciado del pseudo-síndrome de Cushing, siendo sus signos más específicos la presencia de grasa en huecos supraclaviculares, miopatía, piel atrófica y fragilidad vascular. El reconocimiento de sus manifestaciones clínicas y de las sub-poblaciones de riesgo para su diagnóstico debería ser mejorado a través de la educación médica a nivel de grado y del posgrado. La detección clínica del síndrome de Cushing debe ser llevada a cabo principalmente por médicos no-endocrinólogos, pero su diagnóstico etiológico y enfoque terapéutico debe realizarse en centros especializados, con vasta experiencia, para asegurar los mejores resultados en el tratamiento de este difícil trastorno endocrino.

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

    Energy Technology Data Exchange (ETDEWEB)

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

    1998-01-01

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

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

    Directory of Open Access Journals (Sweden)

    Sandra B Andersen

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

  14. Sperm length evolution in the fungus-growing ants

    DEFF Research Database (Denmark)

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

    2009-01-01

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

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

    Directory of Open Access Journals (Sweden)

    Edwin O. Willis

    1984-01-01

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

  16. Ants farm subterranean aphids mostly in single clone groups

    DEFF Research Database (Denmark)

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

    2012-01-01

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

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

    Science.gov (United States)

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

    2015-07-01

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

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

    Science.gov (United States)

    2009-01-01

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

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

    DEFF Research Database (Denmark)

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

    2009-01-01

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

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

    International Nuclear Information System (INIS)

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

    2007-01-01

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

  1. Ant colony search algorithm for optimal reactive power optimization

    Directory of Open Access Journals (Sweden)

    Lenin K.

    2006-01-01

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

  2. application of ant colony optimisation in distribution transformer sizing

    African Journals Online (AJOL)

    HP

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

  3. Epistemología neoidealista y fracaso fundacional del saber educativo

    Directory of Open Access Journals (Sweden)

    Antoni J. COLOM CAÑELLAS

    2009-11-01

    Full Text Available RESUMEN: En este artículo se revisa la aportación de la escuela neokantiana de Badén (principalmente la obra de Windelband y Rickert así como la de Dilthey, culpabilizándoles de integrar a la Pedagogía en el seno de las ciencias de la cultura y de la historia, en ámbitos axiológicos y espiritualistas, lejanos a las concepciones organicistas que por aquel momento eran ya las propias de las otras ciencias humanas. Este discurso alejado de la realidad fáctica del educar no permitió una adecuada recepción de la obra de J. Dewey y a la larga supuso la desaparición de la Pedagogía en manos de la visión positivista de las ciencias de la educación. Se concluye evidenciando que el problema conceptual del saber educativo es más de carácter histórico que no epistemológico.ABSTRACT: In this article the contribution of Baden's neokantian school is revised, mainly Windelband and Rickert's work as well as that of Dilthey, who are blamed for integrating Pedagogy into the milieu of the sciences of culture and history, and in axiologic and spiritualist spheres, far from the organicistic conceptions which at that time already characterised the other humanistic sciences. This reasoning, far from the factual reality of educating, did not permit a suitable reception of J. Dewey's work and in the end meant the disappearance of Pedagogy in the hands of the positivistic vision of education sciences. The article concludes by showing that the conceptual problem of educative knowledge is rather of a historical nature than an epistemological one.SOMMAIRE: Dans cette article on revise Importation neokantienne de l'école de Baden (principalement de l'ouvrage de Windelband et Rickert et aussi celle de Dilthey, afin de démontrer qu'ils sont qui integreron d'une manière indubitable à la Pédagogie dans les sciences de la culture et de la histoire, compris dans les limitations axiologiques et spiritualistes, loin des conceptions organiques, propres des

  4. Verdad, poder y saber: escritura de viajes femenina Truth, power, and knowledge: female travel writings

    Directory of Open Access Journals (Sweden)

    Nara Araújo

    2008-12-01

    Full Text Available O artigo inicia com uma reflexão acerca da articulação que os relatos de viagens - reais ou imaginárias - podem cumprir junto ao discurso moderno sobre as diversidades e as alteridades. Considera, ainda, os relatos como exercício de poder, na medida em que, segundo Foucault, a força do poder reside na produção de efeitos positivos no nível do desejo e do saber. Para tanto, lembra os cronistas responsáveis pelas primeiras descrições do Novo Mundo, cujos livros de viagens adquiriram autoridade sobre as regiões estrangeiras ao desvelar seus mistérios, como a descrição de costumes, hábitos alimentícios, vestimenta e relações familiares, entre outros, e orientando, assim, os novos viajantes. As narrativas de viagens feitas por mulheres são então introduzidas a partir da especificidade de suas abordagens. Afinal, ao irromper o espaço público, elas necessitam estabelecer uma relação entre o espaço, o conhecimento e a autoridade, e, para validar seus discursos, servem-se da história e da referência às fontes consultadas. Marquesa Calderón de la Barca, Isabel Pesado de Mier, as irmãs Larraínzar, Condessa de Merlín e Nísia Floresta são algumas das escritoras aqui trabalhadas.This article begins with a reflection about the influences of the travel reports - real or imaginary ones - on the modern discourse, diversity, and alterities. It also considers the reports as a power instrument, since, according to Foucault, the force of power resides in the production of positive effects in both knowledge and desire levels. Thus, the chroniclers responsible for the first descriptions of the New World are visited. Their books were very useful to the new travelers by revealing the mystery of the foreign lands, as well as their customs, alimentary habits, dressing ways, and familiar relationships, among others. The narratives written by women are then introduced considering the specificity of their approach. After all, when appearing

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

    Science.gov (United States)

    Paul, J; Roces, F

    2003-04-01

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

  6. Climatic warming destabilizes forest ant communities.

    Science.gov (United States)

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

    2016-10-01

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

  7. Recognition in ants: social origin matters.

    Directory of Open Access Journals (Sweden)

    Joël Meunier

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

  8. Nasa's Ant-Inspired Swarmie Robots

    Science.gov (United States)

    Leucht, Kurt W.

    2016-01-01

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

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

    Science.gov (United States)

    Rowles, Alexei D; Silverman, Jules

    2009-08-01

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

  10. Hybridization in East African swarm-raiding army ants

    DEFF Research Database (Denmark)

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

    2011-01-01

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

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

    OpenAIRE

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

    2014-01-01

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

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

    OpenAIRE

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

    1993-01-01

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

  13. SABERES POPULARES E EDUCAÇÃO CIENTÍFICA: UM OLHAR A PARTIR DA LITERATURA NA ÁREA DE ENSINO DE CIÊNCIAS

    Directory of Open Access Journals (Sweden)

    Patrícia Maria Azevedo Xavier

    2015-01-01

    Full Text Available Presentamos una mirada a la literatura en el campo de la Educación Científica acerca del tema saberes populares, buscando comprender como es tratado por la investigación en la Enseñanza de las Ciencias. Realizamos una revisión en seis revistas científicas brasileñas de la área de enseñanza/aprendizaje de las ciencias publicadas entre 2000 y 2012 y, en seguida, buscamos otras publicaciones de los autores encontrados. Después de la lectura de los trabajos, construimos cuatro categorías: Reflexiones teóricas; Nuevas alternativas didácticas; Intercambio de conocimientos con la comunidad; Investigación de las transformaciones a lo largo del tiempo. La investigación acerca de la inserción de saberes populares en la Enseñanza de las Ciencias es aún incipiente y se concentra en el desarrollo de nuevas alternativas didácticas, lo que muestra un movimiento en el sentido de aproximar, por medio de la investigación, los saberes populares del conocimiento escolar. Palabras clave: Saberes populares. Enseñanza de las Ciencias. Revisión de la literatura.Presentamos una mirada a la literatura en el campo de la Educación Científica acerca del tema saberes populares, buscando comprender como es tratado por la investigación en la Enseñanza de las Ciencias. Realizamos una revisión en seis revistas científicas brasileñas de la área de enseñanza/aprendizaje de las ciencias publicadas entre 2000 y 2012 y, en seguida, buscamos otras publicaciones de los autores encontrados. Después de la lectura de los trabajos, construimos cuatro categorías: Reflexiones teóricas; Nuevas alternativas didácticas; Intercambio de conocimientos con la comunidad; Investigación de las transformaciones a lo largo del tiempo. La investigación acerca de la inserción de saberes populares en la Enseñanza de las Ciencias es aún incipiente y se concentra en el desarrollo de nuevas alternativas didácticas, lo que muestra un movimiento en el sentido de

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

    Science.gov (United States)

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

    2010-01-01

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

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

    Science.gov (United States)

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

    2009-07-22

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

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

    Science.gov (United States)

    Pereira, Rogério Dos Santos; Ueno, Mariko

    2008-01-01

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

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

    Directory of Open Access Journals (Sweden)

    Ana Z Gonçalves

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

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

    Science.gov (United States)

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

    2006-09-01

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

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

    Science.gov (United States)

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

    2017-12-15

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

  20. Competence of Litter Ants for Rapid Biodiversity Assessments

    Directory of Open Access Journals (Sweden)

    T. H. Saumya E. Silva

    2017-01-01

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

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

    Directory of Open Access Journals (Sweden)

    Elizabeth G Pringle

    2013-11-01

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

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

    Science.gov (United States)

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

    2016-05-01

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

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

    Science.gov (United States)

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

    2013-11-01

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

  4. Autonomia do paciente idoso com câncer: o direito de saber o diagnóstico Autonomía del paciente anciano con cáncer: el derecho de conocer su diagnóstico Autonomy of elder patients suffering from cancer: the right to know about their diagnoses

    Directory of Open Access Journals (Sweden)

    Angelita Visentin

    2007-12-01

    Full Text Available O crescimento da população idosa no Brasil e no mundo suscita novos desafios para os profissionais de saúde, dentre eles o aumento do número de doenças crônicas, em especial, o câncer. O enfermeiro depara-se, no cotidiano de sua prática de cuidados, com inúmeras situações que geram dilemas e questões éticas que envolvem o paciente e/ou familiares. Tem-se como objetivo refletir a respeito do direito do idoso de saber o seu diagnóstico e do respeito a sua autonomia. Considera-se significativa esta reflexão, pois o ato de cuidar, intrínseco nas ações de enfermagem, deve ser e estar pautado em atitudes éticas e no respeito ao direito do paciente de conhecer o seu diagnóstico.El crecimiento de la población anciana en el Brasil y el mundo genera nuevos retos para los profesionales de la salud, y entre ellos, el aumento del número de enfermedades crónicas, en especial, el cáncer. El enfermero se depara en el cotidiano de su práctica de cuidados con innumerables situaciones que generan dilemas e interrogantes éticas que involucran al paciente y/o familiares. Se tuvo como objetivo reflexionar respecto al derecho del anciano a saber su diagnóstico y sobre su autonomía. Se considera significativa esta reflexión pues el acto de cuidar, intrínseco en las acciones de enfermería, debe ser y estar pautado en actitudes éticas y en el respeto al derecho del paciente a conocer su diagnóstico.The growth of the senior population in Brazil and in the world poses new challenges for the health professionals, and among those, the increase of the number of chronic diseases, especially cancer. Within the practice of his/her work, the nurse faces countless situations that generate dilemmas and ethical questions that involve the patient and/or his/her family. We aim at contemplating the senior's right of knowing his/her diagnosis and the respect to his/her autonomy. Such reflection is considered significant because the action of taking care

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

    OpenAIRE

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

    2014-01-01

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

  6. A produção do conhecimento: diálogo entre os diferentes saberes La producción del conocimiento: un dialogo entre los diferentes saberes Knowledge production: a dialogue among different knowledge

    Directory of Open Access Journals (Sweden)

    Alacoque Lorenzini Erdmann

    2006-08-01

    Full Text Available O texto aborda o diálogo necessário entre os diferentes saberes para a construçao do conhecimento e discorre sobre os avanços da Enfermagem na busca de consistência e clareza da disciplina Enfermagem. Para tanto, o texto apóia-se na transdisciplinaridade, na intersetorialidade, na complexidade e no convívio com os diferentes pares da saúde e outras áreas e na sustentação do espaço da ciência e tecnologia da Enfermagem. Questiona-se sobre que perspectivas se abrem como possibilidades de construção de conhecimentos científicos e tecnológicos num compromisso social mais responsável e solidário. O propósito é ampliar a aptidão para contextualizar e globalizar os saberes e transcender diferenças e peculiaridades na perspectiva de políticas mais qualitativas superando as fronteiras disciplinares.El texto aporta la necesidad del diálogo entre los diferentes saberes para la construcción del conocimiento y nos permite pensar sobre los progresos de la Enfermería en la búsqueda de una consistencia y claridad de la disciplina de Enfermería. Por consiguiente, el texto se fundamenta en la transdisciplinariedad, en la intersectorialidad, en la complejidad y en la convivencia con los diferentes grupos de la salud y otros áreas, así como, en la sustentación del espacio de la ciencia y la tecnología de la Enfermería. Se discute acerca de que perspectivas son abiertas como posibilidades en la construcción de dichos conocimientos científicos y tecnológicos mediante un compromiso social más responsable y solidario. El propósito es ampliar la aptitud y capacidad para contextualizar y globalizar los saberes y poder ultrapasar las diferencias y particularidades en la perspectiva de las políticas más cualitativas de manera a superar todas las fronteras o barreras disciplinarias.This text approaches the necessary dialogue among different knowledge and considers the advances within Nursing in the search for consistence and clarity

  7. Solar Cycle Variations of SABER CO2 and MLS H2O in the Mesosphere and Lower Thermosphere Region

    Science.gov (United States)

    Salinas, C. C. J.; Chang, L. C.; Liang, M. C.; Qian, L.; Yue, J.; Russell, J. M., III; Mlynczak, M. G.

    2017-12-01

    This work aims to present the solar cycle variations of SABER CO2 and MLS H2O in the Mesosphere and Lower Thermosphere region. These observations are then compared to SD-WACCM outputs of CO2 and H2O in order to understand their physical mechanisms. After which, we attempt to model their solar cycle variations using the default TIME-GCM and the TIME-GCM with MERRA reanalysis as lower-boundary conditions. Comparing the outputs of the default TIME-GCM and TIME-GCM with MERRA will give us insight into the importance of solar forcing and lower atmospheric forcing on the solar cycle variations of CO2 and H2O. The solar cycle influence in the parameters are calculated by doing a multiple linear regression with the F10.7 index. The solar cycle of SABER CO2 is reliable above 1e-2 mb and below 1e-3 mb. Preliminary results from the observations show that SABER CO2 has a stronger negative anomaly due to the solar cycle over the winter hemisphere. MLS H2O is reliable until 1e-2. Preliminary results from the observations show that MLS H2O also has a stronger negative anomaly due to the solar cycle over the winter hemisphere. Both SD-WACCM and the default TIME-GCM reproduce these stronger anomalies over the winter hemisphere. An analysis of the tendency equations in SD-WACCM and default TIME-GCM then reveal that for CO2, the stronger winter anomaly may be attributed to stronger downward transport over the winter hemisphere. For H2O, an analysis of the tendency equations in SD-WACCM reveal that the stronger winter anomaly may be attributed to both stronger downward transport and stronger photochemical loss. On the other hand, in the default TIME-GCM, the stronger winter anomaly in H2O may only be attributed to stronger downward transport. For both models, the stronger downward transport is attributed to enhanced stratospheric polar winter jet during solar maximum. Future work will determine whether setting the lower boundary conditions of TIME-GCM with MERRA will improve the match

  8. Saberes locales campesinos sobre el alimento: aportes a la soberanía y la salud mental comunitaria

    Directory of Open Access Journals (Sweden)

    Beatriz E. Arias L.

    2016-06-01

    Full Text Available Introducción: Los trabajos sobre violencia política, salud mental y vida cotidiana realizados en alianza entre la academia y una organización campesina en Antioquia, han llevado a posicionar la soberanía alimentaria como un asunto central en procesos de recuperación y reparación colectiva, en un contexto donde se amalgama el sufrimiento, la precarización del modo de vida campesino y la deuda histórica de una reforma agraria inacabada Objetivo: Explorar los procesos salutogénicos que emergen de las acciones reflexivas emprendidas por un grupo de mujeres campesinas a partir de su participación en una experiencia de Investigación Acción Participativa (IAP y sus aportes a la soberanía alimentaria local. Metodología: Estudio cualitativo que recoge elementos de la IAP, desarrollado en Argelia, Oriente antioqueño, a través de entrevistas semiestructuradas, grupos focales, observación participante y ejercicios de cartografía social, además de acciones de incidencia local Resultados: Se describen los productos derivados del proceso de investigar-actuar-participar tales como la consolidación de un equipo local de investigación y tres acciones de incidencia en la vida local: inventario de semillas nativas y criollas, vivero comunitario, feria campesina y festival gastronómico. Conclusiones: 1 El alimento adquiere una connotación política y trasciende lo nutricional funcional. 2 Los saberes locales de subsistencia/resistencia generan soberanía 3 Las redes sociales sobre las que se soportan los saberes, y los saberes mismos, son recursos sociales de salud. 4 Es necesario problematizar las medidas técnicas convencionales en el campo de la salud mental y ubicar su campo de acción en el terreno de las relaciones microsociales.

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

    Science.gov (United States)

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

    2002-03-01

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

  10. Lo que se debe a las cimentaciones

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    Oroviogoicoechea, Alberto

    1975-05-01

    Full Text Available This article describes: the problems that arise when the foundations has to act on soils with low consistency or when very narrow tolerances have to be met; the origin of the above mentioned problems; the requirements that are not really necessary, with suitable examples; the absolute and relative admissible magnitudes of differential settlements in concrete structures, walls, partitions and metal structures; the tolerances for mechanical installations; recommendations for projects and a table that sums up the proposed tolerances for relative foundations.En el artículo se describen: los problemas que surgen cuando la cimentación ha de actuar sobre terrenos poco consistentes o cuando se quieren cumplir tolerancias muy estrechas; de dónde provienen dichos problemas; las exigencias que no son realmente necesarias, con ejemplos apropiados; las magnitudes absolutas y relativas admisibles de asientos diferenciales, en estructuras de hormigón, muros, tabiques y estructuras metálicas; las tolerancias para instalaciones mecánicas; recomendaciones para proyecto, y una tabla que recoge las tolerancias propuestas para asientos relativos.

  11. The Relationship of Safe and Participatory School Environments and Supportive Attitudes toward Violence: Evidence from the Colombian Saber Test of Citizenship Competencies

    Science.gov (United States)

    Diazgranados, Silvia; Noonan, James

    2015-01-01

    In Colombia, reducing levels of interpersonal and community violence is a key component of the country's approach to citizenship education. In this study, we use data collected during the 2005 Saber test of Citizenship Competencies to examine the relationship of school environments and individual students' supportive attitudes toward violence…

  12. Influence of Solar-Geomagnetic Disturbances on SABER Measurements of 4.3 Micrometer Emission and the Retrieval of Kinetic Temperature and Carbon Dioxide

    Science.gov (United States)

    Mertens, Christopher J.; Winick, Jeremy R.; Picard, Richard H.; Evans, David S.; Lopez-Puertas, Manuel; Wintersteiner, Peter P.; Xu, Xiaojing; Mlynczak, Martin G.; Russell, James M., III

    2008-01-01

    Thermospheric infrared radiance at 4.3 micrometers is susceptible to the influence of solar-geomagnetic disturbances. Ionization processes followed by ion-neutral chemical reactions lead to vibrationally excited NO(+) (i.e., NO(+)(v)) and subsequent 4.3 micrometer emission in the ionospheric E-region. Large enhancements of nighttime 4.3 m emission were observed by the TIMED/SABER instrument during the April 2002 and October-November 2003 solar storms. Global measurements of infrared 4.3 micrometer emission provide an excellent proxy to observe the nighttime E-region response to auroral dosing and to conduct a detailed study of E-region ion-neutral chemistry and energy transfer mechanisms. Furthermore, we find that photoionization processes followed by ion-neutral reactions during quiescent, daytime conditions increase the NO(+) concentration enough to introduce biases in the TIMED/SABER operational processing of kinetic temperature and CO2 data, with the largest effect at summer solstice. In this paper, we discuss solar storm enhancements of 4.3 micrometer emission observed from SABER and assess the impact of NO(+)(v) 4.3 micrometer emission on quiescent, daytime retrievals of Tk/CO2 from the SABER instrument.

  13. DE SEMENTES, DE SABERES E DE PODERES OU DE OGMS E OLMS: EM BUSCA DE PRECISÃO CONCEITUAL

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    Carlos Walter Porto-Gonçalves

    2007-07-01

    Full Text Available Como a ciência está cada vez mais politizada, como demonstra o debate acerca dos transgênicos e da mudança climática global (efeito estufa, a exigência da precisão conceitual torna-se, exatamente por isso, ainda mais necessária. É sabido desde Francis Bacon e reiterado, mais recentemente, por Michel Foucault, que 'saber é poder'. Embora não haja consenso na comunidade científica quanto ao tratamento a ser dado a essa complexa relação, o fato é que a história recente vem nos obrigando a dedicarmos mais atenção ao tema. ...

  14. Das sangrias à penicilina: o saber médico e o tratamento da sífilis.

    OpenAIRE

    Geraldes Neto, Benedito

    2009-01-01

    atual conhecimento técnico sobre etiologia, formas de contágio, quadro clínico e tratamento da sífilis levou mais de quatro séculos para ser construído. O objetivo desta dissertação é identificar e discutir as mudanças ocorridas no saber médico sobre a doença ao longo desse tempo, particularmente com relação ao tratamento. Material e Métodos: Foi realizada pesquisa bibliográfica de natureza histórica, tendo como fontes principais os periódicos médicos das épocas estudadas. A pesquisa foi comp...

  15. Cuerpo, imagen y saberes alimentarios en infantes oaxaqueños, México: un primer acercamiento

    OpenAIRE

    Gabriela Romero; Claudia Paz; Sara Elena Pérez-Gil

    2011-01-01

    Este trabajo se inscribe en la antropología alimentaria. Objetivos: conocer la percepción corporal de niños y niñas de una comunidad oaxaqueña; identificar las diferencias en la percepción y sus saberes alimentarios, según el sexo. Se seleccionaron niños y niñas, entre 8 y 12 años y se les aplicó un cuestionario, entrevistó y se pesaron y midieron. Resultados: las niñas presentan mayor preocupación por su cuerpo y asociaron más la salud con los cuerpos delgados y los niños con la edad y el ej...

  16. Tracing the Inter-Hemispheric Coupling During Polar Summer Periods of 2002-2010 Using TIMED/SABER Measurements

    Science.gov (United States)

    Goldberg, Richard; Feoflow, Artem; Pesnell, Dean; Kutepov, Alexander

    2010-01-01

    It has been found that for more than one polar summer season between 2002-2010, the northern polar mesospheric region near and above the mesospheric maximum was warmer than normal. The strongest warming effect of this type was observed to occur during northern summer 2002. Theoretical studies have implied that these "anomalies" were preceded by unusual dynamical processes occurring in the southern hemisphere. We have analyzed temperature distributions measured by the SABER limb scanning infrared radiometer aboard the NASA TIMED satellite between 2002-2010 at altitudes from 15 to 110 km and for latitudes between 83 deg. S to 83 deg. N. We describe the approach to trace the inter-hemispheric temperature correlatoins and to identify the global features that were unique for the "anomalous" northern polar summers.

  17. Grupos nos liminares do saber : casos da educação em bioquímica

    OpenAIRE

    Rochele de Quadros Loguercio

    2004-01-01

    Esta pesquisa desenvolve uma análise da formação de grupos educacionais que se estabeleceram fora do espaço instituído das faculdades de educação e passaram a ocupar um lugar nos institutos ou departamentos de bioquímica, configurando, desta forma, um novo lugar de saber que passou a ser chamado de Educação em Bioquímica. A proposta de análise é a busca de condições históricas para emergência desses grupos, bem como um entendimento de como essa formação se deu dentro das Sociedades que congre...

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

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    Fatahuddin Fatahuddin

    2010-08-01

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

  19. El sentir y el pensar, unidad fragmentada en la formación del ser humano y los retos de la educación ante esta dicotomía.

    Directory of Open Access Journals (Sweden)

    Amparo Vargas Quintero

    2014-02-01

    Full Text Available En este artículo planteo una discusión sobre los desafíos que debe enfrentar la educación ante los cambios que devienen con las exigencias del nuevo siglo, cambios que se evidencian en la vida cotidiana del hombre contemporáneo, los mismos que generan incertidumbre y propuestas pedagógicas capaces de responder integralmente. Es en este contexto en el que propongo una nueva perspectiva de la educaci6n artística como medio sensibilizador e integrador del currículo, que supere la tradición de una educación estética por mucho tiempo relegada y desintegrada de la vida académica en los proyectos educativos institucionales.

  20. TÉCNICAS, SABERES E PRÁTICAS PSICOLÓGICAS NA PRIMEIRA REPÚBLICA (1889-1930

    Directory of Open Access Journals (Sweden)

    Alexandre de Carvalho Castro

    2018-04-01

    Full Text Available O objetivo deste estudo foi analisar as técnicas, saberes e práticas tidas como psicológicas no Rio de Janeiro da Primeira República (1889-1930. Nesse sentido, pautou-se por uma metodologia que priorizou o levantamento de fontes bibliográficas primárias (artigos, livros e relatórios técnicos de época. Constatou-se, como resultado da pesquisa empreendida, que ocorreram aproximações e convergências entre áreas da psicologia aplicada que, posteriormente, iriam ocupar institucionalmente espaços bem separados. Assim, verificou-se que a designação de dado saber, prática ou técnica configurada como "Psicologia" não foi sempre configurada em áreas de aplicação independentes. Nessa perspectiva, segue uma linha diversa de abordagens históricas que primam por setorizar práticas psicológicas, sendo a principal contribuição do artigo para o campo da história da psicologia justamente a de mostrar que uma eventual “História da Psicologia do Trabalho”, no período investigado, não era absolutamente distinta de áreas, hoje classificadas, como as da “História da Psicologia Clínica”, ou da “História da Psicologia Escolar”.

  1. Observations of Infrared Radiative Cooling in the Thermosphere on Daily to Multiyear Timescales from the TIMED/SABER Instrument

    Science.gov (United States)

    Mlynczak, Martin G.; Hunt, Linda A.; Marshall, B. Thomas; Martin-Torres, F. Javier; Mertens, Christopher J.; Russell, James M., III; Remsberg, Ellis E.; Lopez-Puertas, Manuel; Picard, Richard; Winick, Jeremy; hide

    2009-01-01

    We present observations of the infrared radiative cooling by carbon dioxide (CO2) and nitric oxide (NO) in Earth s thermosphere. These data have been taken over a period of 7 years by the SABER instrument on the NASA TIMED satellite and are the dominant radiative cooling mechanisms for the thermosphere. From the SABER observations we derive vertical profiles of radiative cooling rates (W/cu m), radiative fluxes (W/sq m), and radiated power (W). In the period from January 2002 through January 2009 we observe a large decrease in the cooling rates, fluxes, and power consistent with the declining phase of solar cycle. The power radiated by NO during 2008 when the Sun exhibited few sunspots was nearly one order of magnitude smaller than the peak power observed shortly after the mission began. Substantial short-term variability in the infrared emissions is also observed throughout the entire mission duration. Radiative cooling rates and radiative fluxes from NO exhibit fundamentally different latitude dependence than do those from CO2, with the NO fluxes and cooling rates being largest at high latitudes and polar regions. The cooling rates are shown to be derived relatively independent of the collisional and radiative processes that drive the departure from local thermodynamic equilibrium (LTE) in the CO2 15 m and the NO 5.3 m vibration-rotation bands. The observed NO and CO2 cooling rates have been compiled into a separate dataset and represent a climate data record that is available for use in assessments of radiative cooling in upper atmosphere general circulation models.

  2. Storm Time Variation of Radiative Cooling by Nitric Oxide as Observed by TIMED-SABER and GUVI

    Science.gov (United States)

    Bharti, Gaurav; Sunil Krishna, M. V.; Bag, T.; Jain, Puneet

    2018-02-01

    The variation of O/N2 (reference to N2 column density 1017 cm-2) and nitric oxide radiative emission flux exiting the thermosphere have been studied over the Northern Hemisphere during the superstorm event of 7-12 November 2004. The data have been obtained from Global Ultraviolet Imager (GUVI) and Sounding of the Atmosphere using Broadband Emission Radiometry (SABER) on board the National Aeronautics and Space Administration (NASA)'s Thermosphere, Ionosphere, Mesosphere Energetics and Dynamics (TIMED) satellite. The NO radiative flux is observed to show an anti-correlation with O/N2 on a global scale. Both NO radiative flux and O/N2 ratio show equatorward motion with maximum penetration in western longitude sectors. A local variation of O, O2, and N2 densities have been calculated using NRLMSISE-00 model over a midlatitude location (55°N,180°E). On a local scale, model calculated O/O2 and O/N2 ratios are found to follow the observations made by GUVI. The collisional excitation of NO with atomic oxygen is the most dominant process for the total cooling rate. The SABER-retrieved NO cooling rate (CR) at a local site suggests an enhancement during the storm period with the peak emission rate closely correlated to the progression of the storm. The peak emission altitude of NO CR moves upward during the main phase of the storm. The NO abundance has been calculated by using cooling rate and Nitric Oxide Empirical Model (NOEM) model. Both these suggest a vary large (3-15 times) increase in NO density during the storm, which is required to account the changes in NO radiative flux. A similar kind of enhancement in NO abundance is also noticed in Student Nitric Oxide Explorer observations during intense geomagnetic storms.

  3. La Botánica en el marco de las ciencias naturales: Diversas miradas desde el saber pedagógico pág: 35-50

    Directory of Open Access Journals (Sweden)

    Deysi Serrato Rodríguez

    2013-03-01

    Full Text Available La enseñanza de la botánica se ha visto atravesada por el discurso de la interdisciplinariedad de las ciencias, las competencias científicas y la primacía de otros saberes útiles en contexto, entre otros aspectos que han llevado a pensar que ésta no se enseña, por tal razón, es pertinente indagar a través de los trayectos de práctica, cómo se aborda lo botánico en la escuela tomando como eje principal los saberes pedagógicos que circulan en los maestros que enseñan Biología alrededor de la botánica, ésta desde del marco de las ciencias naturales. Es así, que para lograr visibilizar dichos saberes se recurrió a la mirada arqueológica –genealógica, donde se realizó el rastreo de algunos documentos institucionales e investigativos, las charlas con cinco maestros en torno a su ser y quehacer y el análisis de los anteriores elementos desde la relación sujeto, saber y poder. Con base en lo anterior, se encontró que en la escuela circulan algunos saberes relacionados con la Botánica, los cuales son trabajados desde aspectos taxonómicos y netamente Biológicos. Además, de visibilizarse que en las instituciones educativas y maestros con los que se trabajó conciben la enseñanza de la Botánica, se como un pretexto que contribuye a desarrollar determinadas competencias científicas en la escuela.

  4. La transposición didáctica como estatuto epistemológico fundante de los saberes académicos del profesor

    Directory of Open Access Journals (Sweden)

    Gerardo Andrés Perafán Echeverri

    2013-01-01

    Full Text Available En este trabajo se presentan, de manera parcial, resultados preliminares de la investigación sobre ''El conocimiento profesional docente: nuevas perspectivas epistemológicas y metodológicas'' desarrollada en el marco del programa de Doctorado Interinstitucional en Educación que ofrece la Universidad Pedagógica Nacional y que ha servido como campo conceptual y metodológico a diversos proyectos de investigación sobre el ''Conocimiento profesional docente específico, asociado a categorías particulares'' que adelantan estudiantes de doctorado y maestría bajo mi dirección. Partiendo de desarrollos previos, en los que se ha conceptualizado la noción de conocimiento profesional docente como sistema de ideas integradas, el autor propone una reconceptualización de la categoría saberes académicos del profesor, con el objeto de mostrar su independencia epistemológica de los saberes disciplinares. Por otra parte, dada esta independencia epistemológica de los saberes académicos del profesor respecto de los saberes de las disciplinas, se sugiere, desde la perspectiva de Chevallard, una reconceptualización de la noción de transposición didáctica, para ser entendida como el estatuto epistemológico y antropológico fundante de dichos saberes académicos. Lo anterior abre alternativas para pensar de otra manera el tema de los contenidos escolares, la formación docente y la profesión del educador.

  5. Assessment of the Quality of the Version 1.07 Temperature-Versus-Pressure Profiles of the Middle Atmosphere from TIMED/SABER

    Science.gov (United States)

    Remsberg, E. E.; Marshall, B. T.; Garcia-Comas, M.; Krueger, D.; Lingenfelser, G. S.; Martin-Torres, J.; Mlynczak, M. G.; Russell, J. M., III; Smith, A. K.; Zhao, Y.; hide

    2008-01-01

    The quality of the retrieved temperature-versus-pressure (or T(p)) profiles is described for the middle atmosphere for the publicly available Sounding of the Atmosphere using Broadband Emission Radiometry (SABER) Version 1.07 (V1.07) data set. The primary sources of systematic error for the SABER results below about 70 km are (1) errors in the measured radiances, (2) biases in the forward model, and (3) uncertainties in the corrections for ozone and in the determination of the reference pressure for the retrieved profiles. Comparisons with other correlative data sets indicate that SABER T(p) is too high by 1-3 K in the lower stratosphere but then too low by 1 K near the stratopause and by 2 K in the middle mesosphere. There is little difference between the local thermodynamic equilibrium (LTE) algorithm results below about 70 km from V1.07 and V1.06, but there are substantial improvements/differences for the non-LTE results of V1.07 for the upper mesosphere and lower thermosphere (UMLT) region. In particular, the V1.07 algorithm uses monthly, diurnally averaged CO2 profiles versus latitude from the Whole Atmosphere Community Climate Model. This change has improved the consistency of the character of the tides in its kinetic temperature (T(sub k)). The T(sub k) profiles agree with UMLT values obtained from ground-based measurements of column-averaged OH and O2 emissions and of the Na lidar returns, at least within their mutual uncertainties. SABER T(sub k) values obtained near the mesopause with its daytime algorithm also agree well with the falling sphere climatology at high northern latitudes in summer. It is concluded that the SABER data set can be the basis for improved, diurnal-to-interannual-scale temperatures for the middle atmosphere and especially for its UMLT region.

  6. Psicotrastornos laborales, un antes y un después

    OpenAIRE

    Durán Juvé, Dunia

    2009-01-01

    A medida que va transcurriendo nuestra vida, nos vamos encontrando con situaciones en la vida personal y laboral en las que, muchas veces no sabemos qué hacer y también se van dando situaciones difíciles unas detrás de otras que llega un momento que nos podemos sentir de muchas formas. Por ejemplo: podemos sentir ira o miedo por no saber afrontar determinadas situaciones, o podemos sentir confianza en que vamos a poder resolver todas ellas. En las empresas, como en la vida privada, las per...

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

    DEFF Research Database (Denmark)

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

    2009-01-01

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

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

    Directory of Open Access Journals (Sweden)

    Yoko Inui

    Full Text Available Macaranga myrmecophytes (ant-plants are generally well protected from herbivore attacks by their symbiotic ants (plant-ants. However, larvae of Arhopala (Lepidoptera: Lycaenidae species survive and develop on specific Macaranga ant-plant species without being attacked by the plant-ants of their host species. We hypothesized that Arhopala larvae chemically mimic or camouflage themselves with the ants on their host plant so that the larvae are accepted by the plant-ant species of their host. Chemical analyses of cuticular hydrocarbons showed that chemical congruency varied among Arhopala species; A. dajagaka matched well the host plant-ants, A. amphimuta did not match, and unexpectedly, A. zylda lacked hydrocarbons. Behaviorally, the larvae and dummies coated with cuticular chemicals of A. dajagaka were well attended by the plant-ants, especially by those of the host. A. amphimuta was often attacked by all plant-ants except for the host plant-ants toward the larvae, and those of A. zylda were ignored by all plant-ants. Our results suggested that conspicuous variations exist in the chemical strategies used by the myrmecophilous butterflies that allow them to avoid ant attack and be accepted by the plant-ant colonies.

  9. Cola Bora Bora, experiencias en torno al procomún. Entrevista con Ricardo Antón ColaBoraBora, experiences around the commons. Interview with Ricardo Antón

    Directory of Open Access Journals (Sweden)

    David Prieto Serrano

    2013-03-01

    Full Text Available Ricardo Antón es co-director de Amasté, oficina de ideas detrás de ColaBoraBora (CBB; un proyecto en torno al procomún, el código abierto, las dinámicas colaborativas y el emprendizaje social surgido del marco de oportunidad ofrecido por Eutokia, Centro de Innovación Social de Bilbao. En esta entrevista se describe tanto el propio proyecto como reflexiones generales generadas a lo largo del propio camino de CBB: respondiendo cuestiones como qué se entiende por procomún, sobre la posibilidad de generar una economía social, sobre los frenos culturales, institucionales y personales a la hora de emprender el proyecto o sobre la necesidad de articular teoría y práctica para construir un saber procomún.Ricardo Anton is co-director of Amasté, an office of ideas behind the project ColaBoraBora which focuses on the commons, open source, collaborative dynamics and social entrepreneurship emerged from the opportunity framework offered by Eutokia , a Centre of Social Innovation in Bilbao. In this interview, the author not only describes the project itself but also the general reflections generated along the road of CBB: answering questions such as what is meant by the commons, and questions about the possibility of generating a social economy, about cultural, institutional and personal obstacles when undertaking the project or about the need to link theory and practice to build a common knowledge.

  10. Neuromodulation of Nestmate Recognition Decisions by Pavement Ants.

    Directory of Open Access Journals (Sweden)

    Andrew N Bubak

    Full Text Available Ant colonies are distributed systems that are regulated in a non-hierarchical manner. Without a central authority, individuals inform their decisions by comparing information in local cues to a set of inherent behavioral rules. Individual behavioral decisions collectively change colony behavior and lead to self-organization capable of solving complex problems such as the decision to engage in aggressive societal conflicts with neighbors. Despite the relevance to colony fitness, the mechanisms that drive individual decisions leading to cooperative behavior are not well understood. Here we show how sensory information, both tactile and chemical, and social context-isolation, nestmate interaction, or fighting non-nestmates-affects brain monoamine levels in pavement ants (Tetramorium caespitum. Our results provide evidence that changes in octopamine and serotonin in the brains of individuals are sufficient to alter the decision by pavement ants to be aggressive towards non-nestmate ants whereas increased brain levels of dopamine correlate to physical fighting. We propose a model in which the changes in brain states of many workers collectively lead to the self-organization of societal aggression between neighboring colonies of pavement ants.

  11. Neuromodulation of Nestmate Recognition Decisions by Pavement Ants.

    Science.gov (United States)

    Bubak, Andrew N; Yaeger, Jazmine D W; Renner, Kenneth J; Swallow, John G; Greene, Michael J

    2016-01-01

    Ant colonies are distributed systems that are regulated in a non-hierarchical manner. Without a central authority, individuals inform their decisions by comparing information in local cues to a set of inherent behavioral rules. Individual behavioral decisions collectively change colony behavior and lead to self-organization capable of solving complex problems such as the decision to engage in aggressive societal conflicts with neighbors. Despite the relevance to colony fitness, the mechanisms that drive individual decisions leading to cooperative behavior are not well understood. Here we show how sensory information, both tactile and chemical, and social context-isolation, nestmate interaction, or fighting non-nestmates-affects brain monoamine levels in pavement ants (Tetramorium caespitum). Our results provide evidence that changes in octopamine and serotonin in the brains of individuals are sufficient to alter the decision by pavement ants to be aggressive towards non-nestmate ants whereas increased brain levels of dopamine correlate to physical fighting. We propose a model in which the changes in brain states of many workers collectively lead to the self-organization of societal aggression between neighboring colonies of pavement ants.

  12. Ants avoid superinfections by performing risk-adjusted sanitary care.

    Science.gov (United States)

    Konrad, Matthias; Pull, Christopher D; Metzler, Sina; Seif, Katharina; Naderlinger, Elisabeth; Grasse, Anna V; Cremer, Sylvia

    2018-03-13

    Being cared for when sick is a benefit of sociality that can reduce disease and improve survival of group members. However, individuals providing care risk contracting infectious diseases themselves. If they contract a low pathogen dose, they may develop low-level infections that do not cause disease but still affect host immunity by either decreasing or increasing the host's vulnerability to subsequent infections. Caring for contagious individuals can thus significantly alter the future disease susceptibility of caregivers. Using ants and their fungal pathogens as a model system, we tested if the altered disease susceptibility of experienced caregivers, in turn, affects their expression of sanitary care behavior. We found that low-level infections contracted during sanitary care had protective or neutral effects on secondary exposure to the same (homologous) pathogen but consistently caused high mortality on superinfection with a different (heterologous) pathogen. In response to this risk, the ants selectively adjusted the expression of their sanitary care. Specifically, the ants performed less grooming and more antimicrobial disinfection when caring for nestmates contaminated with heterologous pathogens compared with homologous ones. By modulating the components of sanitary care in this way the ants acquired less infectious particles of the heterologous pathogens, resulting in reduced superinfection. The performance of risk-adjusted sanitary care reveals the remarkable capacity of ants to react to changes in their disease susceptibility, according to their own infection history and to flexibly adjust collective care to individual risk.

  13. PARAMETER ESTIMATION OF VALVE STICTION USING ANT COLONY OPTIMIZATION

    Directory of Open Access Journals (Sweden)

    S. Kalaivani

    2012-07-01

    Full Text Available In this paper, a procedure for quantifying valve stiction in control loops based on ant colony optimization has been proposed. Pneumatic control valves are widely used in the process industry. The control valve contains non-linearities such as stiction, backlash, and deadband that in turn cause oscillations in the process output. Stiction is one of the long-standing problems and it is the most severe problem in the control valves. Thus the measurement data from an oscillating control loop can be used as a possible diagnostic signal to provide an estimate of the stiction magnitude. Quantification of control valve stiction is still a challenging issue. Prior to doing stiction detection and quantification, it is necessary to choose a suitable model structure to describe control-valve stiction. To understand the stiction phenomenon, the Stenman model is used. Ant Colony Optimization (ACO, an intelligent swarm algorithm, proves effective in various fields. The ACO algorithm is inspired from the natural trail following behaviour of ants. The parameters of the Stenman model are estimated using ant colony optimization, from the input-output data by minimizing the error between the actual stiction model output and the simulated stiction model output. Using ant colony optimization, Stenman model with known nonlinear structure and unknown parameters can be estimated.

  14. New fossil ants in French Cretaceous amber (Hymenoptera: Formicidae)

    Science.gov (United States)

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

    2008-02-01

    Recent studies on the ant phylogeny are mainly based on the molecular analyses of extant subfamilies and do not include the extinct, only Cretaceous subfamily Sphecomyrminae. However, the latter is of major importance for ant relationships, as it is considered the most basal subfamily. Therefore, each new discovery of a Mesozoic ant is of high interest for improving our understanding of their early history and basal relationships. In this paper, a new sphecomyrmine ant, allied to the Burmese amber genus Haidomyrmex, is described from mid-Cretaceous amber of France as Haidomyrmodes mammuthus gen. and sp. n. The diagnosis of the tribe Haidomyrmecini is emended based on the new type material, which includes a gyne (alate female) and two incomplete workers. The genus Sphecomyrmodes, hitherto known by a single species from Burmese amber, is also reported and a new species described as S. occidentalis sp. n. after two workers remarkably preserved in a single piece of Early Cenomanian French amber. The new fossils provide additional information on early ant diversity and relationships and demonstrate that the monophyly of the Sphecomyrminae, as currently defined, is still weakly supported.

  15. The cavity-nest ant Temnothorax crassispinus prefers larger nests.

    Science.gov (United States)

    Mitrus, S

    Colonies of the ant Temnothorax crassispinus inhabit mostly cavities in wood and hollow acorns. Typically in the field, nest sites that can be used by the ant are a limited resource. In a field experiment, it was investigated whether the ants prefer a specific size of nest, when different ones are available. In July 2011, a total of 160 artificial nests were placed in a beech-pine forest. Four artificial nests (pieces of wood with volume cavities, ca 415, 605, 730, and 980 mm 3 , respectively) were located on each square meter of the experimental plot. One year later, shortly before the emergence of new sexuals, the nests were collected. In July 2012, colonies inhabited more frequently bigger nests. Among queenright colonies, the ones which inhabited bigger nests had more workers. However, there was no relationship between volume of nest and number of workers for queenless colonies. Queenright colonies from bigger nests produced more sexual individuals, but there was no correlation between number of workers and sex allocation ratio, or between volume of nest and sex allocation ratio. In a laboratory experiment where ant colonies were kept in 470 and 860 mm 3 nests, larger colonies allocated more energy to produce sexual individuals. The results of this study show the selectivity of T. crassispinus ants regarding the size of nest cavity, and that the nest volume has an impact on life history parameters.

  16. Polarized light use in the nocturnal bull ant, Myrmecia midas.

    Science.gov (United States)

    Freas, Cody A; Narendra, Ajay; Lemesle, Corentin; Cheng, Ken

    2017-08-01

    Solitary foraging ants have a navigational toolkit, which includes the use of both terrestrial and celestial visual cues, allowing individuals to successfully pilot between food sources and their nest. One such celestial cue is the polarization pattern in the overhead sky. Here, we explore the use of polarized light during outbound and inbound journeys and with different home vectors in the nocturnal bull ant, Myrmecia midas . We tested foragers on both portions of the foraging trip by rotating the overhead polarization pattern by ±45°. Both outbound and inbound foragers responded to the polarized light change, but the extent to which they responded to the rotation varied. Outbound ants, both close to and further from the nest, compensated for the change in the overhead e-vector by about half of the manipulation, suggesting that outbound ants choose a compromise heading between the celestial and terrestrial compass cues. However, ants returning home compensated for the change in the e-vector by about half of the manipulation when the remaining home vector was short (1-2 m) and by more than half of the manipulation when the remaining vector was long (more than 4 m). We report these findings and discuss why weighting on polarization cues change in different contexts.

  17. Stigmergic construction and topochemical information shape ant nest architecture.

    Science.gov (United States)

    Khuong, Anaïs; Gautrais, Jacques; Perna, Andrea; Sbaï, Chaker; Combe, Maud; Kuntz, Pascale; Jost, Christian; Theraulaz, Guy

    2016-02-02

    The nests of social insects are not only impressive because of their sheer complexity but also because they are built from individuals whose work is not centrally coordinated. A key question is how groups of insects coordinate their building actions. Here, we use a combination of experimental and modeling approaches to investigate nest construction in the ant Lasius niger. We quantify the construction dynamics and the 3D structures built by ants. Then, we characterize individual behaviors and the interactions of ants with the structures they build. We show that two main interactions are involved in the coordination of building actions: (i) a stigmergic-based interaction that controls the amplification of depositions at some locations and is attributable to a pheromone added by ants to the building material; and (ii) a template-based interaction in which ants use their body size as a cue to control the height at which they start to build a roof from existing pillars. We then develop a 3D stochastic model based on these individual behaviors to analyze the effect of pheromone presence and strength on construction dynamics. We show that the model can quantitatively reproduce key features of construction dynamics, including a large-scale pattern of regularly spaced pillars, the formation and merging of caps over the pillars, and the remodeling of built structures. Finally, our model suggests that the lifetime of the pheromone is a highly influential parameter that controls the growth and form of nest architecture.

  18. DATA MINING UNTUK KLASIFIKASI PELANGGAN DENGAN ANT COLONY OPTIMIZATION

    Directory of Open Access Journals (Sweden)

    Maulani Kapiudin

    2007-01-01

    Full Text Available In this research the system for potentially customer classification is designed by extracting rule based classification from raw data with certain criteria. The searching process uses customer database from a bank with data mining technic by using ant colony optimization. A test based on min_case_per_rule variety and phenomene updating were done on a certain period of time. The result are group of customer class which base on rules built by ant and by modifying the pheromone updating, the area of the case is getting bigger. Prototype of the software is coded with C++ 6 version. The customer database master is created by using Microsoft Access. This paper gives information about potential customer of bank that can be classified by prototype of the software. Abstract in Bahasa Indonesia : Pada penelitian untuk sistem klasifikasi potensial customer ini didesain dengan melakukan ekstrak rule berdasarkan klasifikasi dari data mentah dengan kriteria tertentu. Proses pencarian menggunakan database pelanggan dari suatu bank dengan teknik data mining dengan ant colony optimization. Dilakukan percobaan dengan min_case_per_rule variety dan phenomene updating pada periode waktu tertentu. Hasilnya adalah sekelompok class pelanggan yang didasarkan dari rules yang dibangun dengan ant dan dengan dimodifikasi dengan pheromone updating, area permasalahan menjadi lebih melebar. Prototype dari software ini menggunakan C++ versi 6. Database pelanggan dibangun dengan Microsoft Access. Paper ini memberikan informasi mengenai potensi pelanggan dari bank, sehingga dapat diklasifikasikan dengan prototype dari software. Kata kunci: ant colony optimization, classification, min_case_per_rule, term, pheromone updating

  19. Channeler Ant Model: 3 D segmentation of medical images through ant colonies

    International Nuclear Information System (INIS)

    Fiorina, E.; Valzano, S.; Arteche Diaz, R.; Bosco, P.; Gargano, G.; Megna, R.; Oppedisano, C.; Massafra, A.

    2011-01-01

    In this paper the Channeler Ant Model (CAM) and some results of its application to the analysis of medical images are described. The CAM is an algorithm able to segment 3 D structures with different shapes, intensity and background. It makes use of virtual and colonies and exploits their natural capabilities to modify the environment and communicate with each other by pheromone deposition. Its performance has been validated with the segmentation of 3 D artificial objects and it has been already used successfully in lung nodules detection on Computer Tomography images. This work tries to evaluate the CAM as a candidate to solve the quantitative segmentation problem in Magnetic Resonance brain images: to evaluate the percentage of white matter, gray matter and cerebrospinal fluid in each voxel.

  20. Regulation and specificity of antifungal metapleural gland secretion in leaf-cutting ants

    DEFF Research Database (Denmark)

    Yek, Sze Huei; Nash, David Richard; Jensen, Annette Bruun

    2012-01-01

    significantly larger for ants challenged with virulent and mild pathogens/weeds than for controls and Escovopsis-challenged ants. We conclude that the MG defence system of leaf-cutting ants has characteristics reminiscent of an additional cuticular immune system, with specific and non-specific components......Ants have paired metapleural glands (MGs) to produce secretions for prophylactic hygiene. These exocrine glands are particularly well developed in leaf-cutting ants, but whether the ants can actively regulate MG secretion is unknown. In a set of controlled experiments using conidia of five fungi...

  1. Lo Nuevo ante la Enfermedad de Parkinson

    Directory of Open Access Journals (Sweden)

    Juan Mendoza Vega

    1990-12-01

    -cinta, los intentos para mediren forma objetiva el problema motor, el estudio de los “marcadores neuroquímicos” y la aplicación de las nuevas técnicas de imágenes, especialmente la Resonancia Magnética (IRM y la Emisión de Positrones (PET. Por lo menos cinco nuevos medicamentos están ya en prueba, algunos de ellos con muy prometedor resultado inicial: Lisuride, Pergolide, Naxagolide, Budipina y el Deprenyl, del cual ya han llegado noticias a Latinoamérica. Por lo que hace a la dicta, se sugiere que ésta puede afectar en bien o en mal a los pacientes con Parkinson, y varios estudios insisten en la conveniencia de instaurar dietas con bajo contenido de proteínas (o con las proteínas ingeridas a partir de las 5 p.m. únicamente como medio para mejorar la respuesta al tratamiento.

    Los capítulos destinados a los cambios de conducta, las dificultades intelectuales, los beneficios del ejercicio físico reglamentado y de la terapia del lenguaje, cuando hay alteraciones en esta esfera, muestran el creciente interés por un enfoque más completo de este delicado problema.

    El libro es, pues, lectura muy recomendable para todo médico, y debe estar en las bibliotecas profesionales y, por supuesto, en las de escuelas de medicina, hospitales y centros médicos.

    THERAPY OF PARKINSON’S DISEASE William C. Koller, George Paulson, eds. Marcel Dekker, INC, publisher, 270 Madison Avenue New York, NY 10016. Publicado en 1990, 60S páginas, cubierta dura, ilustrado. Precio: US$150. (Reseña: Académico de Número Juan Mendoza-Vega, Director General de la Fundación Instituto Neurológico de Colombia, Bogotá.

  2. Application of chaotic ant swarm optimization in electric load forecasting

    International Nuclear Information System (INIS)

    Hong, W.-C.

    2010-01-01

    Support vector regression (SVR) had revealed strong potential in accurate electric load forecasting, particularly by employing effective evolutionary algorithms to determine suitable values of its three parameters. Based on previous research results, however, these employed evolutionary algorithms themselves have several drawbacks, such as converging prematurely, reaching slowly the global optimal solution, and trapping into a local optimum. This investigation presents an SVR-based electric load forecasting model that applied a novel algorithm, namely chaotic ant swarm optimization (CAS), to improve the forecasting performance by searching its suitable parameters combination. The proposed CAS combines with the chaotic behavior of single ant and self-organization behavior of ant colony in the foraging process to overcome premature local optimum. The empirical results indicate that the SVR model with CAS (SVRCAS) results in better forecasting performance than the other alternative methods, namely SVRCPSO (SVR with chaotic PSO), SVRCGA (SVR with chaotic GA), regression model, and ANN model.

  3. Social isolation and brain development in the ant Camponotus floridanus.

    Science.gov (United States)

    Seid, Marc A; Junge, Erich

    2016-06-01

    Social interactions play a key role in the healthy development of social animals and are most pronounced in species with complex social networks. When developing offspring do not receive proper social interaction, they show developmental impairments. This effect is well documented in mammalian species but controversial in social insects. It has been hypothesized that the enlargement of the mushroom bodies, responsible for learning and memory, observed in social insects is needed for maintaining the large social networks and/or task allocation. This study examines the impact of social isolation on the development of mushroom bodies of the ant Camponotus floridanus. Ants raised in isolation were shown to exhibit impairment in the growth of the mushroom bodies as well as behavioral differences when compared to ants raised in social groups. These results indicate that social interaction is necessary for the proper development of C. floridanus mushroom bodies.

  4. Antígonas. Una visión intertextual

    Directory of Open Access Journals (Sweden)

    Elena Cano Turrión

    2011-04-01

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

  5. Effective ANT based Routing Algorithm for Data Replication in MANETs

    Directory of Open Access Journals (Sweden)

    N.J. Nithya Nandhini

    2013-12-01

    Full Text Available In mobile ad hoc network, the nodes often move and keep on change its topology. Data packets can be forwarded from one node to another on demand. To increase the data accessibility data are replicated at nodes and made as sharable to other nodes. Assuming that all mobile host cooperative to share their memory and allow forwarding the data packets. But in reality, all nodes do not share the resources for the benefits of others. These nodes may act selfishly to share memory and to forward the data packets. This paper focuses on selfishness of mobile nodes in replica allocation and routing protocol based on Ant colony algorithm to improve the efficiency. The Ant colony algorithm is used to reduce the overhead in the mobile network, so that it is more efficient to access the data than with other routing protocols. This result shows the efficiency of ant based routing algorithm in the replication allocation.

  6. Mating, hybridisation and introgression in Lasius ants (Hymenoptera: Formicidae)

    DEFF Research Database (Denmark)

    Van der Have, Tom; Pedersen, Jes Søe; Boomsma, Jacobus Jan

    2011-01-01

    Recent reviews have shown that hybridisation among ant species is likely to be more common than previously appreci-ated, but that documented cases of introgression remain rare. After molecular phylogenetic work had shown that Euro-pean Lasius niger (LINNAEUS, 1758) and L. psammophilus SEIFERT, 1992...... (formerly L. alienus (FOERSTER, 1850)) are unlikely to be very closely related, we decided to analyse an old data set confirming the conclusion by PEARSON (1983) that these two ants can indeed form viable hybrids. We show that signatures of introgression can be detected in a Danish site...... sympatrically. This would imply that multiple accessible field sites are available to study the molecular details of hybridisation and in-trogression between two ant species that have variable degrees of sympatry throughout their distributional ranges...

  7. Evolutionary patterns of proteinase activity in attine ant fungus gardens

    DEFF Research Database (Denmark)

    Semenova, Tatyana; Hughes, David Peter; Boomsma, Jacobus Jan

    2011-01-01

    hypothesized that fungal proteinase activity may have been under selection for efficiency and that different classes of proteinases might be involved. Results: We determined proteinase activity profiles across a wide pH range for fungus gardens of 14 Panamanian species of fungus-growing ants, representing...... classes. Remarkably, the single symbiont that is shared by species of the crown group of Atta and Acromyrmex leaf-cutting ants mostly showed metalloproteinase activity, suggesting that recurrent changes in enzyme production may have occurred throughout the domestication history of fungus-garden symbionts......Background: Attine ants live in symbiosis with a basidiomycetous fungus that they rear on a substrate of plant material. This indirect herbivory implies that the symbiosis is likely to be nitrogen deprived, so that specific mechanisms may have evolved to enhance protein availability. We therefore...

  8. Comparative Immature Morphology of Brazilian Fire Ants (Hymenoptera: Formicidae: Solenopsis

    Directory of Open Access Journals (Sweden)

    Eduardo Gonçalves Paterson Fox

    2012-01-01

    Full Text Available Although common in Brazil, the biology of the fire ant Solenopsis saevissima (Smith is still poorly studied. Larval descriptions are useful to genus-level ant systematics and sometimes to species-level taxonomy. This study presents a detailed description of juveniles of S. saevissima from Brazil, which were compared with Brazilian specimens of Solenopsis invicta Buren, Solenopsis geminata (Fabricius, and Solenopsis altipunctata Pitts. Different larval instars were separated by diagnostic morphological traits which were confirmed by observing moults. Reproductive larvae could be easily sorted by their distinctive body dimensions and shape. Contrary to previous reports on this species, the larvae of S. saevissima proved to be generally identical to those of S. invicta, while a few specimens resembled those of other close species, such as Solenopsis megergates Trager. Mature larvae thus presented considerable intraspecific variation in some characters recently proposed to aid fire ant species separation (morphology of head hairs.

  9. Social context predicts recognition systems in ant queens

    DEFF Research Database (Denmark)

    Dreier, Stéphanie Agnès Jeanine; d'Ettorre, Patrizia

    2009-01-01

    Recognition of group-members is a key feature of sociality. Ants use chemical communication to discriminate nestmates from intruders, enhancing kin cooperation and preventing parasitism. The recognition code is embedded in their cuticular chemical profile, which typically varies between colonies....... We predicted that ants might be capable of accurate recognition in unusual situations when few individuals interact repeatedly, as new colonies started by two to three queens. Individual recognition would be favoured by selection when queens establish dominance hierarchies, because repeated fights...... for dominance are costly; but it would not evolve in absence of hierarchies. We previously showed that Pachycondyla co-founding queens, which form dominance hierarchies, have accurate individual recognition based on chemical cues. Here, we used the ant Lasius niger to test the null hypothesis that individual...

  10. Natural selection drives the evolution of ant life cycles.

    Science.gov (United States)

    Wilson, Edward O; Nowak, Martin A

    2014-09-02

    The genetic origin of advanced social organization has long been one of the outstanding problems of evolutionary biology. Here we present an analysis of the major steps in ant evolution, based for the first time, to our knowledge, on combined recent advances in paleontology, phylogeny, and the study of contemporary life histories. We provide evidence of the causal forces of natural selection shaping several key phenomena: (i) the relative lateness and rarity in geological time of the emergence of eusociality in ants and other animal phylads; (ii) the prevalence of monogamy at the time of evolutionary origin; and (iii) the female-biased sex allocation observed in many ant species. We argue that a clear understanding of the evolution of social insects can emerge if, in addition to relatedness-based arguments, we take into account key factors of natural history and study how natural selection acts on alleles that modify social behavior.

  11. Native supercolonies of unrelated individuals in the invasive Argentine ant

    DEFF Research Database (Denmark)

    Pedersen, Jes Søe; Krieger, Michael J. B.; Vogel, Valérie

    2006-01-01

    organization is not only a key attribute responsible for the ecological dominance of these ants, but also an evolutionary paradox because relatedness between nestmates is effectively zero. Recently, it has been proposed that, in the Argentine ant, unicoloniality is a derived trait that evolved after its......Kinship among group members has long been recognized as a main factor promoting the evolution of sociality and reproductive altruism, yet some ants have an extraordinary social organization, called unicoloniality, whereby individuals mix freely among physically separated nests. This type of social...... with related individuals who are aggressive toward members of other colonies, we found that native populations also form supercolonies, and are effectively unicolonial. Moreover, just as in introduced populations, the relatedness between nestmates is not distinguishable from zero in these native range...

  12. Ants at Ton Nga Chang Wildlife Sanctuary, Songkhla

    Directory of Open Access Journals (Sweden)

    Watanasit, S.

    2005-03-01

    Full Text Available The aim of this study was to investigate diversity of ant at Ton Nga Chang Wildlife Sanctuary, Hat Yai, Songkhla. Three line transects (100 m each were randomly set up in 2 types of forest area, disturbed and undisturbed. Hand collecting (HC and leaf litter sampling (LL were applied for ant collection within a time limit of 30 minutes for each method. This study was carried out every month during Febuary 2002- Febuary 2003. The results showed that 206 species were placed under 8 subfamilies: Aenictinae, Cerapachyinae, Dolichoderinae, Formicinae, Leptanillinae, Myrmicinae, Ponerinae and Pseudomyrmecinae. Study sites and collection methods could divide ant species into 2 groups, whereas seasonal change could not distinguish the groups by DCA of multivariate analysis.

  13. Social isolation and brain development in the ant Camponotus floridanus

    Science.gov (United States)

    Seid, Marc A.; Junge, Erich

    2016-06-01

    Social interactions play a key role in the healthy development of social animals and are most pronounced in species with complex social networks. When developing offspring do not receive proper social interaction, they show developmental impairments. This effect is well documented in mammalian species but controversial in social insects. It has been hypothesized that the enlargement of the mushroom bodies, responsible for learning and memory, observed in social insects is needed for maintaining the large social networks and/or task allocation. This study examines the impact of social isolation on the development of mushroom bodies of the ant Camponotus floridanus. Ants raised in isolation were shown to exhibit impairment in the growth of the mushroom bodies as well as behavioral differences when compared to ants raised in social groups. These results indicate that social interaction is necessary for the proper development of C. floridanus mushroom bodies.

  14. Ant colonies prefer infected over uninfected nest sites

    DEFF Research Database (Denmark)

    Pontieri, Luigi; Vojvodic, Svjetlana; Graham, Riley

    2014-01-01

    with sporulating mycelium of the entomopathogenic fungus Metarhizium brunneum (infected nests), nests containing nestmates killed by freezing (uninfected nests), and empty nests. In contrast to the expectation pharaoh ant colonies preferentially (84%) moved into the infected nest when presented with the choice...... the high risk of epidemics in group-living animals. Choosing nest sites free of pathogens is hypothesized to be highly efficient in invasive ants as each of their introduced populations is often an open network of nests exchanging individuals (unicolonial) with frequent relocation into new nest sites...... and low genetic diversity, likely making these species particularly vulnerable to parasites and diseases. We investigated the nest site preference of the invasive pharaoh ant, Monomorium pharaonis, through binary choice tests between three nest types: nests containing dead nestmates overgrown...

  15. EVOLUTIONARY TRANSITIONS IN ENZYME ACTIVITY OF ANT FUNGUS GARDENS

    DEFF Research Database (Denmark)

    De Fine Licht, Henrik H; Schiøtt, Morten; Mueller, Ulrich G

    2010-01-01

    an association with a monophyletic clade of specialized symbionts. In conjunction with the transition to specialized symbionts, the ants advanced in colony size and social complexity. Here we provide a comparative study of the functional specialization in extracellular enzyme activities in fungus gardens across...... the attine phylogeny. We show that, relative to sister clades, gardens of higher-attine ants have enhanced activity of protein-digesting enzymes, whereas gardens of leaf-cutting ants also have increased activity of starch-digesting enzymes. However, the enzyme activities of lower-attine fungus gardens...... are targeted primarily towards partial degradation of plant cell walls, reflecting a plesiomorphic state of non-domesticated fungi. The enzyme profiles of the higher-attine and leaf-cutting gardens appear particularly suited to digest fresh plant materials and to access nutrients from live cells without major...

  16. Trabajo no remunerado y reproductivo. ¿Quién debe de pagar la reproducción de la fuerza de trabajo de una nación?

    Directory of Open Access Journals (Sweden)

    Alicia Girón

    2016-01-01

    Full Text Available Se aborda el problema de ¿Quién debe de pagar el costo de la reproducción de la fuerza del trabajo de una nación? en relación a la ampliación de la participación de las mujeres en el mercado laboral y el desdibujamiento del Estado del Bienestar, de la cual surge la preocupación sobre el trabajo desempeñado por las mujeres en la unidad familiar. Además examina la búsqueda por contabilizar el trabajo no remunerado. A lo largo de las últimas cuatro décadas las crisis recurrentes han sido la consecución de frecuentes planes de estabilización, reestructuración y renegociaciones de los créditos con acreedores e inversionistas financieros institucionales en los mercados financieros. La orientación del gasto público al pago del servicio de la deuda y a los compromisos de los países con el exterior han ido mermando la capacidad del gasto público principalmente en cuanto al gasto social como el gasto en educación y el gasto en salud. Lo ha impactado en las políticas públicas. Un agradecimiento a Andrea Reyes, becaria del Consejo Nacional de Ciencias y Tecnología (CONACYT, por la recopilación del material para este trabajo.

  17. El debate debe continuar. Jesús A. Bejarano y la enseñanza de la economía The debate must go on. Bejarano and the teaching of economics

    Directory of Open Access Journals (Sweden)

    Kalmanovitz Salomón

    1999-12-01

    Full Text Available Este ensayo recoge la participación de Jesus Antonio Bejarano en los debates que se dieron en torno a la enseñanza de la economía en el país entre 1980 y el presente. Figuran el problema del currículo sus contenídos y secuencia, el papel que debe jugar el lenguaje, la lectura de fuentes o de manuales, la formalización matematica y la misma pedagogia. Es tambIén una reminiscencia sobre la Facultad de Ciencias Económicas de la Universidad Nacional y un somero analisis de la Universidad como institución. La pregunta que se hace al final es ¿hacia donde va la Facultad?This essay covers Bejarano' s participation in debates on the teaching of economics in Colombia from 1980 to the present time. Among the issues raised are curricular design, their contents and sequence, the role of language, the use of primary sources in economic theory versus textbooks, mathematical formalization and pedagogy itself. It is also a personal memoir of the Faculty of Economic Sciences of the Universidad Nacional, and includes a summary analysis of the University as an institution. The essay ends with the question: whither the Faculty?

  18. Pericarpial nectary-visiting ants do not provide fruit protection against pre-dispersal seed predators regardless of ant species composition and resource availability.

    Directory of Open Access Journals (Sweden)

    Priscila Andre Sanz-Veiga

    Full Text Available Extrafloral nectaries can occur in both vegetative and reproductive plant structures. In many Rubiaceae species in the Brazilian Cerrado, after corolla abscission, the floral nectary continues to secret nectar throughout fruit development originating post-floral pericarpial nectaries which commonly attract many ant species. The occurrence of such nectar secreting structures might be strategic for fruit protection against seed predators, as plants are expected to invest higher on more valuable and vulnerable parts. Here, we performed ant exclusion experiments to investigate whether the interaction with ants mediated by the pericarpial nectaries of Tocoyena formosa affects plant reproductive success by reducing the number of pre-dispersal seed predators. We also assessed whether ant protection was dependent on ant species composition and resource availability. Although most of the plants were visited by large and aggressive ant species, such as Ectatomma tuberculatum and species of the genus Camponotus, ants did not protect fruits against seed predators. Furthermore, the result of the interaction was neither related to ant species composition nor to the availability of resources. We suggest that these results may be related to the nature and behavior of the most important seed predators, like Hemicolpus abdominalis weevil which the exoskeleton toughness prevent it from being predated by most ant species. On the other hand, not explored factors, such as reward quality, local ant abundance, ant colony characteristics and/or the presence of alternative energetic sources could also account for variations in ant frequency, composition, and finally ant protective effects, highlighting the conditionality of facultative plant-ant mutualisms.

  19. Agricultural matrices affect ground ant assemblage composition inside forest fragments.

    Directory of Open Access Journals (Sweden)

    Diego Santana Assis

    Full Text Available The establishment of agricultural matrices generally involves deforestation, which leads to fragmentation of the remaining forest. This fragmentation can affect forest dynamics both positively and negatively. Since most animal species are affected, certain groups can be used to measure the impact of such fragmentation. This study aimed to measure the impacts of agricultural crops (matrices on ant communities of adjacent lower montane Atlantic rainforest fragments. We sampled nine forest fragments at locations surrounded by different agricultural matrices, namely: coffee (3 replicates; sugarcane (3; and pasture (3. At each site we installed pitfall traps along a 500 m transect from the interior of the matrix to the interior of the fragment (20 pitfall traps ~25 m apart. Each transect was partitioned into four categories: interior of the matrix; edge of the matrix; edge of the fragment; and interior of the fragment. For each sample site, we measured ant species richness and ant community composition within each transect category. Ant richness and composition differed between fragments and matrices. Each sample location had a specific composition of ants, probably because of the influence of the nature and management of the agricultural matrices. Species composition in the coffee matrix had the highest similarity to its corresponding fragment. The variability in species composition within forest fragments surrounded by pasture was greatest when compared with forest fragments surrounded by sugarcane or, to a lesser extent, coffee. Functional guild composition differed between locations, but the most representative guild was 'generalist' both in the agricultural matrices and forest fragments. Our results are important for understanding how agricultural matrices act on ant communities, and also, how these isolated forest fragments could act as an island of biodiversity in an 'ocean of crops'.

  20. Agricultural matrices affect ground ant assemblage composition inside forest fragments.

    Science.gov (United States)

    Assis, Diego Santana; Dos Santos, Iracenir Andrade; Ramos, Flavio Nunes; Barrios-Rojas, Katty Elena; Majer, Jonathan David; Vilela, Evaldo Ferreira

    2018-01-01

    The establishment of agricultural matrices generally involves deforestation, which leads to fragmentation of the remaining forest. This fragmentation can affect forest dynamics both positively and negatively. Since most animal species are affected, certain groups can be used to measure the impact of such fragmentation. This study aimed to measure the impacts of agricultural crops (matrices) on ant communities of adjacent lower montane Atlantic rainforest fragments. We sampled nine forest fragments at locations surrounded by different agricultural matrices, namely: coffee (3 replicates); sugarcane (3); and pasture (3). At each site we installed pitfall traps along a 500 m transect from the interior of the matrix to the interior of the fragment (20 pitfall traps ~25 m apart). Each transect was partitioned into four categories: interior of the matrix; edge of the matrix; edge of the fragment; and interior of the fragment. For each sample site, we measured ant species richness and ant community composition within each transect category. Ant richness and composition differed between fragments and matrices. Each sample location had a specific composition of ants, probably because of the influence of the nature and management of the agricultural matrices. Species composition in the coffee matrix had the highest similarity to its corresponding fragment. The variability in species composition within forest fragments surrounded by pasture was greatest when compared with forest fragments surrounded by sugarcane or, to a lesser extent, coffee. Functional guild composition differed between locations, but the most representative guild was 'generalist' both in the agricultural matrices and forest fragments. Our results are important for understanding how agricultural matrices act on ant communities, and also, how these isolated forest fragments could act as an island of biodiversity in an 'ocean of crops'.