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Sample records for dietas enterais antes

  1. Qualidade microbiológica e temperatura de dietas enterais antes e após implantação do sistema de análise de perigos e pontos críticos de controle Microbiological quality and temperatures of enteral feedings before and after implementation of hazard analysis and critical control point

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    Miriam Isabel Souza dos Santos Simon

    2007-04-01

    Full Text Available OBJETIVOS: Avaliar a qualidade microbiológica e a temperatura de dietas enterais antes e após a implementação do sistema Análise de Perigos e Pontos Críticos de Controle na Central de Produção de Alimentação Enteral do Hospital de Clínicas de Porto Alegre. MÉTODOS: Durante o período de setembro de 2001 a janeiro de 2002, foram coletadas 320 amostras de 4 tipos de dietas enterais produzidas na Central de Produção de Alimentação Enteral (dietas padrão I, II, III e dieta especial, as quais foram submetidas a análises microbiológicas e de temperatura. As amostras foram coletadas semanalmente em dois pontos do processo: logo após o preparo e após 16 horas de armazenamento refrigerado. Para comparação dos dados pré e pós análise dos perigos em pontos criticos e de controle, utilizou-se o teste "t" de Wilcoxon para amostras pareadas (teste não-paramétrico equivalente ao teste "t" de Student para amostras pareadas com nível de significância de 0,05. RESULTADOS: Antes da análise de perigos e pontos críticos de controle, 92% das temperaturas de armazenamento estavam acima dos valores de refererência vigentes. Após a implantação da análise de perigos e pontos críticos de controle, houve reduções significantes (pOBJECTIVE: This study evaluated microbiological quality and temperature of enteral formulas before and after the implementation of the Hazard Analysis Critical Control Points system at the Central of Enteral Feedings of Hospital de Clínicas de Porto Alegre. METHODS: During the period of September 2001 and January 2002, 320 samples of four kinds of enteral feeding identified as diets I, II, III, and Special diet were collected and submitted to temperature and microbiological analysis. Samples were collected weekly in two steps of the flow chart of production: immediately after preparation and after 16 hours of storage at refrigeration. For statistical analysis, the Wilcoxon's test was used. RESULTS: Before

  2. Qualidade nutricional e microbiológica de dietas enterais artesanais padronizadas preparadas nas residências de pacientes em terapia nutricional domiciliar

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    Valdirene Francisca Neves dos Santos

    2013-04-01

    Full Text Available OBJETIVO: Avaliar as propriedades físico-químicas, microbiológicas e nutricionais de dietas enterais artesanais padronizadas preparadas nos domicílios de pacientes em terapia nutricional domiciliar. MÉTODOS: Foram desenvolvidas duas formulações de dietas enterais (F1=1,2kcal/mL e F2=1,5kcal/mL, elaboradas com maltodextrina (155/155g, concentrado proteico de soro de leite (30/15g e óleos vegetais (30/60g dissolvidos em água (q.s.p.1000mL. Os cuidadores receberam os ingredientes e as medidas padrão e foram orientados quanto ao preparo e às boas práticas de manipulação. O estudo teve duração de quatro meses, e amostras das dietas preparadas nos domicílios de 33 pacientes foram coletadas e analisadas no início e no final deste período. As amostras foram avaliadas quanto à sua adequação percentual em relação aos valores prescritos de macronutrientes e energia, bem como aos padrões microbiológicos estabelecidos pela legislação vigente. RESULTADOS: As dietas formuladas (Formulação 1/Formulação 2 apresentaram os seguintes teores de macronutrientes, energia e osmolalidade: água - 73,5/70,0%; proteína - 4,4/6,0%; lipídeo - 4,3/6,6%; carboidrato - 16,9/16,4%; energia - 120/150kcal/100mL; osmolalidade - 440/450mOsm/kg.H2O. As variações nas adequações percentuais das amostras domiciliares foram menores que 20,0% tanto na primeira quanto na última amostragem. As proporções de amostras em desacordo com os padrões legais foram significantemente menores nas amostras finais, 24,0% e 36,0% para bactérias mesófilas e coliformes, respectivamente. CONCLUSÃO: O preparo das dietas nos domicílios apresentou boa reprodutibilidade; no entanto, a qualidade microbiológica ainda permanece uma questão preocupante, exigindo uma atuação cuidadosa do profissional de saúde nos domicílios.

  3. CARACTERÍSTICAS FÍSICO QUÍMICAS DE DIETAS ENTERAIS ARTESANAIS COM HIDROLISADO PROTÉICO DE CARNE

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    M. C. B. C. VON ATZINGEN

    2008-11-01

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    A nutrição enteral consiste em uma opção terapêutica que visa a manutenção ou recuperação do estado nutricional. Formulações para nutrição enteral não-industrializadas são preparações à base de alimentos in natura ou de mesclas de produtos não-industrializados com módulos de nutrientes. Entretanto, as informações existentes sobre suas características físico-químicas são escassas. O objetivo do presente estudo foi determinar osmolalidade, viscosidade, fluidez e pH de dietas enterais artesanais com hidrolisado protéico de carne. As dietas tiveram como fonte protéica os hidrolisados de carne bovina, de frango e de peru. A osmolalidade foi determinada em osmômetro por método crioscópico, a viscosidade por fluxo através de tubo capilar em viscosímetro digital programável Brookfield modelo DV-II e o pH em potenciômetro DMPH-2. Os valores de osmolalidade e viscosidade das dietas elaboradas com os hidrolisados de carne bovina, frango e peru foram respectivamente: 411 ± 0,0 mosm/ Kg e 43,9cP; 438,5 ± 0,7 mosm/Kg e 65,3cP; 415 ± 0,0 mosm/ Kg e 57,1cP. As dietas elaboradas com os três hidrolisados apresentaram pH de 6,1, valor considerado não interferente na motilidade gástrica. As fórmulas desenvolvidas foram classificadas como levemente hipertônicas, com viscosidade, fluidez e pH dentro do preconizado, o que é indicativo de sua administração sem intercorrências significativas.

  4. Validation of a predictive model describing growth of Salmonella in enteral feeds Validação de um modelo preditivo para descrever o crescimento de Salmonella em dietas enterais

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    Roberta Ribeiro Silva

    2009-03-01

    Full Text Available The growth of Salmonella enterica subs. enterica sorovar Typhimurium at 25°C was monitored in industrialized and hospital formulated enteral feeds and the results were used to validate the mathematical model of Salmonella growth presented by the Pathogen Modeling Program (PMP 7.0 (USDA-USA. The generation time of Salmonella in enteral feeds ranged from 21 to 34.8 min and, the maximum growth rate (µmax varied from 1.28 to 1.95 h-1, resulting in a population increase from 5 to 6 log10 cycles within 14 to 24 h incubation. Growth was faster in the hospital formulated feed containing vegetables and eggs. The growth kinetic's parameters as lag phase; µmax and maximum population density (MPD were similar to those predicted by the PMP 7.0, with exception of lag phase in enteral diet at pH 6.3. The results of this study validated the PMP 7.0 model for describe Salmonella growth in enteral feeds and demonstrates the appropriateness of use such model to determine the pathogen behavior in a wide range of storage conditions in this food.O crescimento de Salmonella enterica subs. enterica sorovar Typhimurium a 25°C foi determinado em dietas enterais industrializadas e formuladas em hospital e os resultados obtidos foram usados para validar um modelo matemático de crescimento de Salmonella apresentado no Programa de Modelagem de Patógenos (PMP, versão 7,0 (USDA-EUA. O tempo de geração de Salmonella em dietas enterais variou de 21 a 34,8 min e a velocidade específica máxima de crescimento (µmax foi de 1,28 a 1,95 h-1, resultando em aumento de 5 a 6 ciclos logarítimos em um período de 14 a 24 h de incubação. O crescimento foi mais rápido na dieta formulada em hospital contendo vegetais e ovos. Os parâmetros cinéticos como fase lag, µmax e densidade populacional máxima (MDP foram similares aqueles previstos no PMP 7.0, com exceção da fase lag em dietas enteral com pH 6,3. Os resultados deste estudo validaram o modelo do PMP 7,0 para

  5. Antibiotic resistance of Staphylococcus aureus isolated from enteral diets in a public hospital of Minas Gerais Resistência a antibióticos de Staphylococcus aureus isolados de dietas enterais em um hospital público de Minas Gerais

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    Nélio José de Andrade

    2007-10-01

    Full Text Available Enteral diets constitute an excellent means for microbial growth due to its composition rich in nutrients and its time of exposure to room temperature during application. Among the pathogenic bacteria there is the Staphylococcus aureus that is an opportunist microorganism found in the humans’ mucous membrane (buccal, nasal and oral. Samples of enteral diet after application as well as of the environment used for the preparation of the diets, were collected in a public hospital in Minas Gerais and analyzed for the presence of S. aureus. The contamination by S. aureus was evidenced in 83% of the enteral diet samples. As for the environment, the values found were in conformity with APHA recommendation. The isolated strains were submitted to the evaluation of the resistance to different antibiotics. Resistance was observed for tetracycline (100%, erythromycin (90,9%, chloramphenicol (59,1%, estreptomycin (22,72%, penicillin 18,8%, vancomycin (13,63%, ampicillin (13,63%, amoxilin (9,09% and gentamicin (4,54%. Due to the versatility in the resistance development to several antibiotics the S. aureus survives in hospital environments and can be diffused among patients. Dietas enterais constituem um excelente meio para crescimento microbiano, devido à sua composição rica em nutrientes e ao tempo de exposição à temperatura ambiente durante a administração. Dentre as bactérias patogênicas que podem ser encontradas nessas dietas, cita-se o Staphylococcus aureus, microrganismo oportunista encontrado na microbiota da membrana mucosa (bucal, nasal e oral em seres humanos. Amostras de dieta enteral pós-administração e do ambiente utilizado para o seu preparo foram coletadas em um hospital público e analisadas quanto à presença de S. aureus. A contaminação foi evidenciada em 83% das amostras de dietas enterais, e, quanto ao ambiente, os valores encontrados se apresentam de acordo com a recomendação da APHA. As cepas isoladas foram

  6. Dietas enterais não industrializadas: análise microbiológica e verificação de boas práticas de preparação Non industrialized enteral diets: microbiological analysis and verification of good preparation practices

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    Angélica Aparecida Maurício

    2008-02-01

    Full Text Available OBJETIVO: Verificar a adequação das áreas de produção e o nível de contaminação microbiana de dietas enterais utilizadas em três hospitais privados da Região Noroeste do Paraná. MÉTODOS: A análise das Boas Práticas de Preparação da Nutrição Enteral seguiu a Resolução da Diretoria Colegiada nº 63/2000, da Agência Nacional de Vigilância Sanitária, e as análises microbiológicas das 15 amostras de dietas enterais seguiram as recomendações da Resolução da Diretoria Colegiada nº 12/2001, da Agência Nacional de Vigilância Sanitária, nas quais foram pesquisados bolores e leveduras, bactérias mesófilas, coliformes a 35 e 45ºC, Estafilococos coagulase positiva, Salmonella sp. e Bacillus cereus. RESULTADOS: A maior porcentagem para as Não Conformidades foi do hospital HS (61% e a menor do hospital HT (43,5%. Foi observada, em 100% das amostras dos hospitais HP e HT, contaminação por coliformes a 45ºC acima do padrão de referência da Resolução da Diretoria Colegiada nº 12/2001 e 60% das amostras do hospital HS apresentaram contaminação por coliformes a 35ºC acima do limite aceitável. As amostras encontravam-se dentro dos padrões para Estafilococos coagulase positiva, Salmonella sp., Bacillus cereus e bactérias mesófilas. Nos hospitais HT e HP a contaminação por bolores e leveduras estava acima do padrão permitido pela legislação. Os resultados das análises mostraram que a contaminação das dietas está relacionada ao tipo de ingrediente utilizado e ao excesso de manipulação. CONCLUSÃO: Conclui-se que as boas práticas de preparação da nutrição enteral não estavam de acordo com a Resolução da Diretoria Colegiada nº 63/2000 e que os hospitais estavam inadequados para preparar esse tipo de alimento.OBJECTIVE: To verify the degree of suitability of production areas and the level of microbial contamination in enteral diets used in three private hospitals in the Northwest region of Paran

  7. Dieta

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    Alfredo Darío Espinosa Brito

    2010-12-01

    Full Text Available Este artículo presenta la dieta adecuada que debe ingerirse según los componentes diarios de los nutrientes, tanto por las personas sanas como por aquellas que presentan alguna enfermedad dentro de las crónicas no transmisibles. Se exponen elementos para el consumo mínimo y máximo de grasas, carbohidratos y proteínas según los requerimientos energéticos de las personas. Se informa sobre el contenido de colesterol, fibras dietéticas y sal para algunos tipos de alimentos y se recomiendan dietas para reducir las principales causas de morbilidad y mortalidad por enfermedades crónicas no transmisibles.This article presents the appropriate diet for healthy people and for those suffering from some of the chronic non-communicable diseases, according to daily nutrients that should be included. Elements for the minimum and maximum consumption of fats, carbohydrates and proteins as to energy requirements of individuals are provided as well as content charts on cholesterol, dietary fiber and salt, according to different types of food. Special diets to reduce the leading causes of morbidity and mortality for chronic non-communicable diseases are recommended.

  8. Calidad de la dieta "antes y durante" un tratamiento de pérdida de peso basado en dieta mediterránea, terapia conductual y educación nutricional

    OpenAIRE

    Eva María Morales-Falo; Carmen Sánchez-Moreno; Alberto Esteban; Juan José Alburquerque; Marta Garaulet

    2013-01-01

    Introducción: El método de pérdida de peso (dieta mediterránea, terapia de comportamiento y educación nutricional) ha mostrado ser efectivo en el tratamiento de la obesidad. Objetivo: El objetivo del presente trabajo es evaluar y comparar la calidad de las dietas ingeridas antes y durante el tratamiento mediante el Índice de Alimentación Saludable (IAS) y su relación con diferentes variables. Materiales y métodos: La muestra fue de 392 pacientes (330 mujeres, 62 hombres), edad 39,3 ± 11,5 año...

  9. 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....

  10. INLUÊNCIA DO TEMPO DE DESCANSO “ANTE MORTEM” E DIETA DE MELAÇO SOBRE OS NÍVEIS DE GLICOGÊNIO MUSCULAR NA CARNE DE EQÜINOS (Equus caballus INFLUENCE OF “ANTE MORTEM” RESTING TIME AND MOLASSES DIET UPON MUSCULAR GLYCOGEN LEVELS IN EQUINES MEAT (Equus caballus

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    César Augusto Garcia

    2007-09-01

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    Foram coletadas 48 amostras de músculos tríceps braquial e bíceps femural de vinte e quatro eqüinos machos, sem raça definida, adultos e com pesos aproximadamente iguais. Antes do abate, os animais foram divididos em seis lotes que tiveram descanso ante mortem de zero, seis, quatorze, dezoito e vinte e quatro horas respectivamente. O lote de animais que descansou por dezoito horas foi subdividido em dois sublotes, sendo que um deles recebeu dieta de solução aquosa a 5% de melaço. Todos os outros animais só receberam água e ficaram em jejum. Não se observou influência sobre o pH. O glicogênio foi dosado pelos métodos de Pfluger e Nelson. O lote que apresentou menores índices de glicogênio foi o que descansou por zero hora, enquanto que o lote que apresentou maiores índices de glicogênio foi o que descansou por vinte e quatro horas.

    Influence of “ante mortem” resting time and molasses diet upon muscular glycogen levels in equines meat (Equus caballus were studied. Forty-eight samples of triceps brachial and biceps femoral muscles of twenty-four adults and hybrids equines with approximately the same weights were analyzed. The animals were divided before death, in six groups with “ante mortem” resting time of zero, six, fourteen, eighteen and twenty-four hours, respectively. The animal groups with eighteen hours of rest were divided in two sub-groups and one received water solution with 5% of molasses. Alteration in pH levels were not observed. The glycogen was measured by Pfluger and Nelson’s methods. The group with smaller glycogen level was the group with zero hour of “ante mortem” rest, while the group with higher glycogen levels was the group with twenty-four hours of rest.

  11. Densidade energética da dieta e ingestão energética total segundo consumo de adoçantes e/ou alimentos processados com adoçantes

    OpenAIRE

    Carolina Faria Tavares

    2013-01-01

    Introdução. O consumo de açúcares aumentou consideravelmente nas últimas décadas, bem como a incidência e a prevalência da obesidade, gerando a elaboração de recomendações para moderá-lo. Os açúcares contribuem para a palatabilidade dos alimentos, podendo também aumentar sua densidade energética (DE), outro fator de risco para obesidade. Uma alternativa seria a substituição por adoçantes não calóricos, que também aumentam a palatabilidade dos alimentos, porém são isentos calorias. No entanto,...

  12. Estado oxidante-antioxidante en pacientes obesas antes y después de una dieta y ejercicio : cambios estructurales de la insulina expuesta a sangre de pacientes obesas

    OpenAIRE

    Gutiérrez López, Liliana

    2012-01-01

    Programa de Doctorado en Alto Rendimiento Deportivo Introducción: Varios estudios han mostrado que la dieta y el ejercicio son importantes en el tratamiento de la obesidad. De hecho, el estado de estrés oxidativo del paciente obeso mejora después del ejercicio de moderada intensidad; lo cual pone de manifiesto la importancia de ambos para disminuir los efectos adversos del estrés oxidativo durante el tratamiento de la obesidad. El objetivo de este trabajo fue determinar si el tratamiento c...

  13. Translocation of Klebsiella sp. in mice fed an enteral diet containing prebiotics Translocação de Klebsiella sp. em camundongos alimentados com dieta enteral contendo prebióticos

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    Daniele Ferreira da Silva

    2009-04-01

    Full Text Available OBJECTIVE: This work aimed to evaluate the effect of fructooligosaccharide and inulin added to an enteral diet on the translocation of Klebsiella sp. in mice. METHODS: Four- to six-week-old Swiss albino mice were divided into nine groups and fed enteral diets containing different combinations of fructooligosaccharide, inulin, antibiotic and corticoid, inoculated or not with Klebsiella pneumoniae. On day 5, the animals of four groups were fed an enteral diet contaminated with approximately 10(10CFU/g of K. pneumoniae. At defined times, two animals of each group were sacrificed and their organs (spleen, heart, liver, lungs, and kidneys were aseptically collected, weighed, and analyzed for the presence of typical Klebsiella sp. colonies. RESULTS: A higher number of CFU/g of Klebsiella was detected in the organs of the animals in the immune-suppressed group fed the diet contaminated with K. pneumoniae and without prebiotics. Animals fed the diet enriched with fructooligosaccharide and inulin, at a concentration of 15.3mg/g of body weight, had a shorter period of Klebsiella sp. translocation, compared with those not fed prebiotics in the diet. CONCLUSION: The addition of fructooligosacharide and inulin in enterais diets at a concentration of 15.3mg/g of body weight resulted in the reduction of translocation of Klebsiella for spleen, heart, liver, lung and kidneys of mice that had received the diet contaminated associated or not with antibiotic and imunodepressor drug.OBJETIVO: Avaliar o efeito da administração de frutooligossacarídeo e inulina, adicionados à dieta enteral, na translocação de Klebsiella sp. em camundongos. MÉTODOS: Camundongos albinos suíços, com quatro a seis semanas de vida, foram divididos em nove grupos e tratados com dietas enterais contendo diferentes combinações de frutooligossacarídeos, inulina, antibiótico e corticóide, inoculadas ou não com Klebsiella pneumoniae. No quinto dia de experimento, os animais dos

  14. Salud y dietas hiperproteicas

    OpenAIRE

    Rodrigo Barriuso, Ana

    2016-01-01

    Introducción: La actual globalización y cultura de masas ha popularizado la aplicación de las dietas hiperproteicas (ingesta diaria superior a 0,8g/kg de peso corporal) en diversos campos. Su consumo en exceso, si no es necesario terapéuticamente, puede generar a nivel óseo, hemodinámico, endocrino y renal, efectos negativos sobre la salud. Justificación: El uso de dietas altas en proteínas, ha planteado la necesidad de programas educativos y de divulgación, donde puede ser ...

  15. Atividade da amilase no intestino delgado de coelhos alimentados com dietas contendo diferentes níveis de amido antes e após desmame = Amylase activity in the small intestine of rabbits fed with diets containing starch levels before and after weaning

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    Haroldo Garcia de Faria

    2006-07-01

    Full Text Available Para avaliar a atividade amilásica em coelhos após a desmama, foram utilizados 200 animais da Raça Nova Zelândia Branco, submetidos a diferentes padrões de alimentação desde a fase de lactação. Quarenta deles foram abatidos aos 35 dias de idade e 80, aos 50 e aos 70 dias de idade. Para modular o padrão de consumo de leite e ração antes da desmama, as ninhadas equalizadas em 8 láparos do nascimento até ao 16º dia de idade, a partir desta idade, até a desmama, foram submetidos à alta e baixa disponibilidade de leite, mantendo ninhadas com 4 ou 8 láparos recebendo dietas com nível normal (15% e alto (24% de amido. A partir da desmama, os animais de cada um dos 4 padrões de alimentação até a desmama passaram a receber as mesmasdietas com níveis normal e alto de amido, em um esquema fatorial 2x2x2 (ninhadas submetidas à baixa e alta disponibilidade de leite versus dois níveis de amido na dieta até a desmama versus doisníveis de amido na dieta após a desmama. Os resultados mostraram que a manutenção de ninhadas com 4 ou 8 animais entre o 16º e 35º dia de lactação não modificou (P>0,05 a atividade da amilase em qualquer das idades avaliadas após o desmame. O uso de dietas com alto teor de amido durante a lactação aumentou (POne experiment was carried out to study the amylase activity in the small intestine (jejunum and ileum of rabbits from litters maintained on different feeding patterns. Two hundred White New Zealand rabbits were analyzed, out of which 40 35- days-old rabbits, 80 50-days-old rabbits and 80 70-days-old rabbits were slaughtered. To modulate the pattern of feed and milk intake before weaning, the litters were modulated for eight young rabbits until 16 days old. From 16 days until weaning, they were submitted to low or high milkavailability, litters maintained with four or eight young rabbits receiving diets containing normal or high starch level. The animals were distributed in a factorial design 2

  16. 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....

  17. 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 ...

  18. Caractereisticas de la dieta de una muestra de adolescentes con sobrepeso y obesidad: estudio EVASYON

    OpenAIRE

    Suárez, N.; Wärnberg, Julia; Zapatera, Belén; Campoy, Cristina; Martí, Amelia; Garragori, J. M.; Marcos, Ascensión

    2014-01-01

    La prevalencia de sobrepeso y obesidad en niños y adolescentes ha aumentado en los últimos años en nuestro país, liderando la prevalencia europea de obesidad infantil. El propósito de este estudio es obtener información sobre la calidad de la dieta de una muestra de adolescentes con sobrepeso y obesidad antes de comenzar un estudio de intervención integral de nutrición, actividad física y psicología EVASYON es un estudio multicéntrico realizado en 5 hospitales españoles (Granada, Madrid, Pamp...

  19. Epilepsia e dieta cetogénica

    OpenAIRE

    Oliveira, Tiago Carvalheira Côrte-Real

    2003-01-01

    Resumo da tese: Aproximadamente 1 em cada 5 pessoas com epilepsia tem crises persistentes que não respondem ao tratamento farmacológico. A dieta cetogénica, introduzida por Wilder em 1921, continua a ser uma das terapias com maior eficácia no tratamento das crises epilépticas fármaco-ressistentes. É uma dieta rica em gordura e pobre em hidratos de carbono e proteína, desenhada com o objectivo de simular um jejum prolongado. Apesar de não ser conhecido o seu mecanismo de acção, acredita-se que...

  20. Reproducción y dieta de Liolaemus koslowskyi Etheridge 1993

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    Aun, Liliana

    1998-01-01

    Full Text Available Se describe el ciclo reproductivo y la dieta de una población de Liolaemus koslowskyi, de la localidad de Pomán, Departamento de Pomán, Catamarca, Argentina. Esta especie presenta un ciclo reproductivo estacional con dos posturas al año, en primavera y a principios del verano. El tamaño de la carnada es de 3-9 huevos por postura. La dieta tanto para machos como para hembras consiste en hormigas, coleópteros, hemípteros, larvas, pupas y arañas. Numéricamente las hormigas son las más abundantes y la mayor contribución en volumen es el de los coleópteros. The reproductive cycle and diet are described for a population Liolaernus koslowskyi studied at Pomán, Departamento Pomán, Catamarca, Argentina. This species has a seasonal reproductive cycle with egg production occurring in spring and early summer. Females may produce two clutches of eggs each year. Clutch size vares from 3-9 eggs and is correlated with female snout-vent length. The diet of males and females consists of ants, beetles, hemipterans, larvae, pupae, and spiders. Numerically, ants are most abundant in the diet whereas volumetrically, beetles contribute the most.

  1. Dieta Cetogénica - Abordagem Nutricional

    OpenAIRE

    Vasconcelos, Carla

    2014-01-01

    A dieta cetogénica, proposta por Wilder em 1921, é um tratamento não farmacológico utilizado na epilepsia refratária à terapêutica anti-epiléptica em indivíduos com esta patologia, essencialmente crianças. Caracteriza-se por uma dieta rica em gordura e pobre em hidratos de carbono, com o fim de simular o estado de jejum prolongado. O seu mecanismo de acção não está completamente desvendado, porém são evidentes os efeitos anti-epilépticos observados. Cerca de um terço a metade dos doentes trat...

  2. Dieta elevada em carboidratos complexos minimiza necessidade de suplementação durante jogo-treino de rúgbi: foco no sistema imune

    OpenAIRE

    Cândido, Rafael Frata; Barboza, Saulo Delfino; Rogerio, Alexandre de Paula; Mota, Gustavo Ribeiro da; Mendes, Edmar Lacerda

    2017-01-01

    Resumo O estudo analisou a imunidade oral após treino de rúgbi em atletas submetidos à dieta com alto teor de carboidratos (DATC). Em estudo randomizado, duplo-cego e placebo controlado, 20 atletas consumiram DATC por três dias antes do experimento. Os atletas receberam aleatoriamente bebida carboidratada (CHO) ou placebo (PLA) e participaram de duas sessões de treino de rúgbi, separados por sete dias. Coletas de saliva foram feitas antes (Pré-E), imediatamente após (Pós-E) e 1 h após (1 h Pó...

  3. Aspectos nutricionales de la dieta mediterránea

    OpenAIRE

    Mariné Font, Abel; Vidal, M. Carmen

    1999-01-01

    Se realiza un anàlisis de los orígenes de la dieta mediterránea, los cuales se remontan a las grandes culturas clásicas de la Edad Antigua. Además, se describe lo que hoy en dia cabe entender como dieta mediterránea y se analiza el valor nutritivo de los alimentos que integran los diversos tipos de dietas mediterrdneas. Finalmente, se realizan algunas consideraciones sobre la bondad de la dieta mediterránea, que, sin ser una panacea, es lo suficientemente equilibrada y agradable para consider...

  4. Dieta enteral prescrita versus dieta infundida Prescribed enteral diet versus infused diet

    Directory of Open Access Journals (Sweden)

    Silvana Aparecida Ribeiro Simões

    2017-07-01

    Full Text Available Objetivo: Avaliar o volume prescrito de dieta enteral versus o volume infundido, identificando as causas de interrupção da dieta e os gastos gerados por essas interrupções. Métodos: Estudo observacional, com pacientes adultos e idosos, recebendo nutrição enteral em um hospital particular de São Paulo. A coleta de dados foi realizada por meio de prontuário eletrônico. Resultados: O volume infundido foi significantemente menor que o volume prescrito, nos cinco dias de acompanhamento, em toda a amostra. A principal intercorrência na administração da dieta foi a diarreia. Os gastos com a não administração da dieta somam 41,4% do valor despendido para esse serviço. Conclusão: Este estudo contribui para a atuação e desempenho do nutricionista em conjunto com a Equipe Multidisciplinar em Terapia Nutricional visando a melhora do paciente.

  5. 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.

  6. Obesidade e a substituição de macronutrientes da dieta Obesity and diet macronutrients substitution

    Directory of Open Access Journals (Sweden)

    Eliane Lopes ROSADO

    2001-08-01

    Full Text Available Os fatores envolvidos na gênese da obesidade não são conclusivos, incluindo o papel dos macronutrientes da dieta na suscetibilidade ao ganho de peso. O carboidrato pode ser considerado um componente importante na saciedade. Sua substituição pelo adoçante, reduz o valor energético da dieta, reduzindo a massa corporal. Os efeitos dos adoçantes sobre o apetite dependem da natureza e da densidade dos nutrientes consumidos simultaneamente. Não existem evidencias suficientes que mostrem que os adoçantes causam ganho de peso, mas seu uso pode resultar em compensação energética com alimentos ricos em lipídios. Os lipídios tendem a aumentar a densidade energética da dieta promovendo o superconsumo passivo de energia, além de apresentar baixa prioridade oxidativa, estando associado à baixa saciedade. Sua substituição tem sido relacionada à compensação da ingestão energética, principalmente por carboidratos. Um plano alimentar disciplinado deve incluir alimentos que reduzam a densidade energética da dieta, sem promoção do consumo alimentar.The factors involved in obesity genesis are not conclusive, including the function of diet macronutrients concerning susceptibility of weight gain. Carbohydrate can be considered an important component in satiety. Its substitution for sweeteners decreases the diet caloric value, consequently decreasing body mass. The effects of sweeteners on appetite rely on nature and density of the nutrients that are consumed simultaneously with sweeteners. There are no sufficient evidences showing that sweeteners cause weight gain, but the use of sweeteners may result on energetic compensation with lipid-rich foods. Lipids tend to increase diet energetic density promoting high passive consumption of energy, besides its low oxidative priority, which is associated with low satiety. Lipid substitution has been related to caloric ingestion compensation, mainly for carbohydrates. A disciplined dietetic plan

  7. 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

  8. Aporte de Minerales del mate cocido a la dieta

    Directory of Open Access Journals (Sweden)

    Lorena Francini

    2011-04-01

    Full Text Available Este trabajo surgió como la continuación del trabajo "YERBA MATE... ¿SIMPLEMENTE UN HABITO O UN BUEN ALIMENTO?" en el cual se analizó el contenido total de: K, Mn, Mg, Ca, Fe, Zn, Na, Cu y Ni en once yerbas comercializadas en Uruguay.En la región comprendida por Argentina, Uruguay, Brasil y Paraguay la yerba mate se consume mayoritariamente como mate (extracción en caliente, tereré (extracción en frío y mate cocido (infusión caliente. A los efectos de conocer el aporte de minerales de la yerba a la dieta diaria, se analizó el contenido de K, Mn, Mg, Fe y Zn (por ser los presentes en mayor cantidad en la yerba mate en una simulación de mate cocido, con lo que se determinó que porcentaje de estos es extraído en dicha infusión.Para realizar la simulación de mate cocido, se colocaron 50g de yerba mate en 1L de agua desionizada y se calentó en plancha con agitación hasta alcanzar una temperatura de 99°C. La solución sobrenadante fue filtrada en caliente en filtro de papel de 640W y luego en frío a través de filtro de membrana de 0,45 µm. Los minerales antes mencionados fueron determinados por espectroscopía de emisión óptica (PERKIN ELMER OPTIMA 2100. Obteniéndose como resultado Zn= 2,9mg/L, Fe= 0,36mg/L, Mn= 57mg/L, K= 848mg/L en el extracto preparado como se mencionó anteriormente. Representando una extracción del contenido total de la yerba mate cercano al 100% para potasio y cinc, del 70% para el manganeso y del 2% para el hierro.De los resultados obtenidos se concluye que de consumirse un litro de mate cocido diario preparado en forma similar a la de este trabajo, se cubrirían ampliamente los requerimientos diarios de manganeso, se cubriría el 50% de los requerimientos diarios de magnesio, el 20% de los de potasio y cinc y el 6% de los de hierro.La yerba mate es un alimento ampliamente difundido y en los estratos sociales más bajos llega a sustituir una o más comidas diarias, lo que convierte a la I

  9. 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...

  10. 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 ...

  11. 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.

  12. 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.

  13. 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, ...

  14. "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...

  15. 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

  16. Dietas terapéuticas, conceptos, controversias y errores

    OpenAIRE

    Alemany, Marià, 1946-

    1998-01-01

    Las dietas terapéuticas, utilizadas para el tratamiento de la obesidad representan siempre un compromiso de limitación del aporte energético creando los menos problemas posibles, para que el margen de utilidad sea efectivo se requiere que el aporte calórico sea muy bajo para combatir la caida del gasto energético que lleva aparejada su utilización, pero esto afecta negativamente el metabolismo nitrogenado, por lo que la utifización de estas dietas viene limitado en el tiempo. Su efectividad a...

  17. Dieta cetogênica: como o uso de uma dieta pode interferir em mecanismos neuropatológicos

    OpenAIRE

    Pereira, Érica Silva; Alves, Marion; Sacramento, Thaiana; Rocha, Vera Lúcia

    2010-01-01

    p. 78-82 A dieta cetogênica tem sido usada de forma ampla e com sucesso para o tratamento de crianças com epilepsia de difícil controle desde a década de 1920. Mas foi somente há uma década que a dieta cetogênica deixou de ser vista como um tratamento alternativo ou de última escolha para estes pacientes e seu uso tem sido considerado em todo o mundo. O objetivo deste trabalho foi revisar o conhecimento disponível acerca da dieta cetogênica: mecanismo de ação, eficácia, tolerabili...

  18. 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....

  19. 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...

  20. 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...

  1. 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

  2. CÁNCER DE MAMA Y DIETA: REVISIÓN

    OpenAIRE

    Fernández Ortega, Jairo Alejandro

    2010-01-01

    El cáncer es una de las principales causas de mortalidad y el número total de casos está aumentando en todo el mundo. En las mujeres, el cáncer de mama es el segundo cáncer más frecuente, su aparición está asociada a varios factores de riesgo: como estilos de vida poco sanos (consumo de tabaco y alcohol, dieta inadecuada, falta de actividad física) y exposición a carcinógenos. El propósito de este estudio es identificar y comprender las relaciones entre la dieta y el riesgo de cáncer de mama....

  3. Parâmetros clínicos, hematológicos e bioquímicos de novilhas com hipocalcemia subclínica pré-parto suplementadas com dieta aniônica

    Directory of Open Access Journals (Sweden)

    C. Pizoni

    Full Text Available RESUMO A hipótese do presente estudo consiste em que uma dieta aniônica prolongada acarretaria uma mobilização mais rápida do cálcio sanguíneo. O objetivo proposto foi avaliar parâmetros clínicos, hematológicos e bioquímicos de novilhas, com hipocalcemia subclínica, submetidas a diferentes períodos de fornecimento de dieta aniônica no pré-parto. Foram utilizadas nove novilhas da raça Holandês induzidas à hipocalcemia subclínica no pré-parto, divididas em três grupos: G0 = sem dieta aniônica antes da indução; G11 = 11 dias de dieta aniônica pré-indução; e G15 = 15 dias de dieta aniônica pré-indução. Foi realizado exame clínico antes e depois da indução, e avaliaram-se cálcio total e ionizado, magnésio e albumina nos dias -2, 0, 1, 2 e 3 (dia 0 = momento da indução e parâmetros hematológicos nos dias 0, 1, 2 e 3. O G11 apresentou maiores concentrações de cálcio total e ionizado que o G0 e maiores níveis de cálcio total que o G15 (P<0,01. O magnésio teve maiores valores no G15 quando comparado aos outros grupos (P<0,01. O G0 apresentou os maiores valores de monócitos e neutrófilos bastonetes (P<0,01. A dieta aniônica por 11 dias é suficiente para manter a homeostase do cálcio e a resposta leucocitária em novilhas desafiadas a uma diminuição do cálcio sanguíneo.

  4. DIETA Y PREVENCIÓN SECUNDARIA DE LA ENFERMEDAD CARDIOVASCULAR

    Directory of Open Access Journals (Sweden)

    Luis Alberto Ángel Arango

    2011-01-01

    Conclusiones. Las dietas de tipo mediterráneo y reductora del colesterol ricas en ácidos grasos omega-3 probablemente tienen un efecto favorable en la prevención cardiovascular secundaria (B-IIa, este efecto desaparece si se asocia con tratamiento farmacológico de los factores cardiovasculares de riesgo (B-III. Los ácidos grasos omega-3 probablemente incrementan la mortalidad en pacientes con angina y favorecen la recurrencia de arritmias ventriculares (B-III.

  5. Teores proteicos em dietas para vacas Holandesas leiteiras em confinamento

    Directory of Open Access Journals (Sweden)

    V.R. Paiva

    2013-08-01

    Full Text Available Avaliou-se o efeito de dietas com níveis de proteína bruta ‒ PB (10, 12, 14 e 16% na matéria seca ‒ MS em vacas Holandesas mestiças com produção de leite médio (PL de 13kg/dia. Utilizou-se silagem de milho como volumoso, e a relação volumoso:concentrado foi de 75:25. Houve aumento linear para o consumo de todos os componentes da dieta, exceto para o consumo de carboidratos totais e carboidratos não fibrosos (CNF, que reduziram linearmente. O consumo dos nutrientes digestíveis totais (NDT apresentou comportamento quadrático, com valor máximo estimado de 10,13kg/dia, na dose de 15,62% de PB na dieta. As digestibilidades de PB, EE, FDN e FDNcp aumentaram linearmente. Já os valores de digestibilidade de MS, MO, CNF e NDT apresentaram efeito quadrático, estimando-se ponto de máximo de 65,09; 67,23; 78,35 e 67,92 nas doses de 15,39; 15,22; 15,62 e 15,68% de PB, respectivamente. A PL, sem e com correção para 3,5% de gordura, a variação de peso corporal e a composição do leite aumentaram linearmente, exceto para lactose, que não apresentou efeito. O nível de 14% de PB na dieta é o mais indicado para alimentação de vacas com produção média de 13kg/dia de leite.

  6. 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....

  7. 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.

  8. Las dietas cetogénicas: potenciales efectos saludables de la Dieta Cetogénica Mediterránea Española

    OpenAIRE

    Pérez-Guisado, Joaquín

    2014-01-01

    Las dietas cetogénicas han demostrado ser una manera sana y efectiva de perder peso ya que promueven un perfil lipídico no aterogénico, disminuyen la presión arterial y la resistencia a la insulina y además son capaces de mejorar los niveles sanguíneos de glucosa e insulina. Por otro lado, la dieta mediterránea es bien conocida por sus saludables propiedades, siendo ingredientes fundamentales de esta dieta el aceite de oliva, el vino tinto y los vegetales. En España, el pescado...

  9. 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].

  10. AVALIAÇÃO DA ADIÇÃO DO KEFIR EM DIETA HOSPITALAR

    Directory of Open Access Journals (Sweden)

    Joice de Fátima Laureano Martins

    2012-06-01

    Full Text Available Os grãos de kefir são utilizados na elaboração de um produto lácteo fermentado o qual denominamos kefir. Sua introdução em dietas hospitalares promove vários benefícios aos pacientes e possui grande capacidade de estimular o sistema imunológico. Objetivou-se verificar a aceitação de diferentes formulações tendo como ingrediente o kefir. Os grãos de kefir (5 % foram cultivados por 24 horas à temperatura de 22º C. Em seguida, foram preparadas quatro formulações. Formulação 1 - 50 % de kefir cultivado em leite de vaca integral com 50 % de polpa de morango e adoçante (0,2 mL/100 mL; formulação 2 - 50 % de kefir cultivado em leite de vaca desnatado com 50 % de polpa de morango e adoçante (0,2 mL/100 mL; formulação 3 - 50 % de kefir cultivado em leite de vaca integral com 50 % de polpa de morango e 10 % de sacarose e formulação 4 - 50 % de kefir cultivado em leite de vaca desnatado com 50 % de polpa de morango e 10 % de sacarose. A análise sensorial foi realizada em um hospital do município de Viçosa-MG, tendo como provadores acompanhantes de pacientes internados e funcionários. Verificou-se a aceitação das formulações e utilizouse a escala hedônica de nove pontos. Todas as formulações apresentaram considerável aceitação enquadrando-se com maior frequência entre os escores «gostei moderadamente» a «gostei muito». Estes formulados apresentaram grande potencial para serem introduzidos em dietoterapia e poderão atuar tanto como adjunto ao tratamento de patologias gastrintestinais, como no controle glicêmico e hipercolesterolêmico.

  11. 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...

  12. Qualidade da dieta de adolescentes e fatores associados

    Directory of Open Access Journals (Sweden)

    Loiva Lide Wendpap

    2014-01-01

    Full Text Available Analisar a qualidade da dieta de adolescentes pelo Índice de Qualidade da Dieta Revisado (IQD-R e os fatores associados. Foi realizado estudo transversal com 1.326 adolescentes de escolas públicas e privadas. O consumo alimentar foi obtido utilizando-se questionário de frequência alimentar. Utilizou-se razão de prevalência para avaliar a associação entre o IQD-R elevado (≥ percentil 75 e as variáveis independentes. Variáveis com valor de p <0,20 foram incluídas na regressão de Poisson. A média do IQD-R foi de 75,1 pontos (IC95%: 74,8-75,5. Tempo ≤ 2 horas diárias gasto em atividades sedentárias como assistir televisão, usar computador ou games; tempo ≥ 300 minutos por semana de atividade física e excesso de peso dos adolescentes foram associados a maiores pontuações do IQD-R. Estilo de vida saudável foi associado à dieta de melhor qualidade. Destaca-se a importância do incentivo à prática de atividade física, redução do número de horas diárias em atividades sedentárias e intervenção na prática alimentar dos adolescentes.

  13. 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

  14. Dieta mediterránea y enfermedad cardiovascular

    OpenAIRE

    Carasa López, Irene

    2016-01-01

    La Enfermedad cardiovascular es uno de los grandes problemas sanitarios de la sociedad, puesto que es la principal causa de mortalidad en el mundo. De ahí la importancia de estudiar que la desencadena y, sobre todo, como prevenir su aparición. Numerosos estudios han demostrado que la Dieta Mediterránea tiene un efecto cardioprotector. Como alimentos propios de ella, aceite de oliva (ácido oleico), frutos secos, legumbres, cereales, pescado, vegetales, hortalizas, frutas y vino tinto, contr...

  15. Zeólita na dieta de bovinos de corte

    Directory of Open Access Journals (Sweden)

    L.R.A Câmara

    2012-06-01

    Full Text Available Avaliou-se o efeito da inclusão de zeólita na dieta de bovinos de corte sobre os parâmetros ruminais, as digestibilidades total e parcial, a produção de nitrogênio, a eficiência microbiana e as características do sangue. Os tratamentos, com base na matéria seca (MS da dieta, foram: 0; 0,75; 1,5; 2,25 e 3,0% de zeólita. Utilizaram-se cinco bovinos machos mestiços, fistulados no rúmen e abomaso, alimentados com silagem de milho e concentrado, representando 65% de volumoso e 35% de concentrado. O delineamento utilizado foi em quadrado latino 5×5, com cinco períodos de 15 dias. Os animais receberam 15g de dióxido de titânio (TiO2 do terceiro ao 12º dia de cada período. Houve efeito (P<0,05 sobre o consumo diário (kg/dia de proteína bruta (PB e efeito (P<0,05 sobre o consumo de MS e de fibra em detergente neutro corrigida para cinza e proteína, expresso em g/kg de peso. A digestibilidade total dos nutrientes digestíveis totais (NDT foi influenciada pelos tratamentos (P<0,05. A digestibilidade ruminal dos carboidratos não fibrosos (CNF foi afetada quadraticamente (P<0,05, assim como a intestinal da PB e dos CNF. A ingestão e a excreção fecal de nitrogênio (g/dia foram influenciadas linearmente (P<0,05 pela inclusão de zeólita. Concluiu-se que a adição de zeólita na dieta, embora tenha aumentado os consumos de MS e de FDN, não melhorou a utilização da ureia em dietas de bovinos de corte.

  16. Las dietas hiperproteicas y sus consecuencias metabólicas

    OpenAIRE

    López-Luzardo, Michelle

    2009-01-01

    El consumo excesivo de proteínas produce un incremento en la excreción neta de ácidos, lo cual a su vez aumenta la excreción urinaria de calcio. Los efectos de la dieta sobre la excreción urinaria de ácidos y de calcio no sólo dependen de la cantidad de proteínas, sino que también pueden ser modificados por otros constituyentes de la alimentación, tales como el potasio y los equivalentes alcalinos de bicarbonato contenidos en las frutas y hortalizas. La deficiencia de estas bases de potasio e...

  17. 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.

  18. 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.

  19. Dietas vegetarianas e desempenho esportivo Vegetarian diets and sports performance

    Directory of Open Access Journals (Sweden)

    Lucas Guimarães Ferreira

    2006-08-01

    Full Text Available As evidências atuais apontam benefícios da dieta vegetariana para a saúde humana. Contudo, a partir da adoção de práticas vegetarianas mais restritivas, confirmam-se os riscos à saúde. As dietas vegetarianas são caracterizadas pelo elevado consumo de carboidratos, fibras, magnésio, potássio, folato e antioxidantes, podendo apresentar deficiências em aminoácidos e ácidos graxos essenciais, cálcio, zinco, ferro e cobalamina. Pesquisas experimentais em humanos indicam que vegetarianos e não-vegetarianos apresentam capacidade aeróbica semelhante. Em relação ao desempenho em atividades de força e potência muscular, as pesquisas são escassas, mas as existentes não apontam diferenças significativas. Situações de risco cardiovascular têm sido confirmadas, devido ao provável quadro de hiperhomocisteinemia, em decorrência da baixa ingestão de cobalamina. As dietas vegetarianas são isentas de creatina, o que resulta em estoques musculares mais baixos nessa população. Possivelmente ocorrem alterações hormonais e metabólicas em resposta às dietas vegetarianas, como baixos níveis de testosterona e androstenediona. A função imune parece não ser prejudicada. Dessa forma, a prática de dietas vegetarianas apresenta-se compatível com a prática esportiva cotidiana, desde que bem planejada para evitar deficiências nutricionais.Current evidences show benefits of a vegetarian diet for human health. However, when a stricter vegetarian diet is adopted, health risks are confirmed. Vegetarian diets are characterized by a high intake of carbohydrates, fibers, magnesium, potassium, folate and antioxidants and may result in a low intake of amino acids, essential fatty acids, calcium, zinc, iron and cobalamin. Experimental human researches indicate that both vegetarians and non-vegetarians present similar aerobic capacity. Regarding muscular strength and power, researches are scarce but the existent ones do not report significant

  20. Pest repelling properties of ant pheromones

    DEFF Research Database (Denmark)

    Offenberg, Joachim

    2014-01-01

    Ants control pests via predation and physical deterrence; however, ant communication is based on chemical cues which may serve as warning signals to potential prey and other intruders. The presence of ant pheromones may, thus, be sufficient to repel pests from ant territories. This mini-review sh......-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...

  1. Dietas a base de forraje tradicional y nopal (Opuntia spp. enriquecido con proteínas para alimentar cabras

    Directory of Open Access Journals (Sweden)

    Arnoldo Flores-Hernández

    2017-01-01

    Full Text Available El objetivo fue determinar la composición química de las dietas y su efecto en la ganancia de peso vivo, consumo y rechazo de alimento. El estudio se realizó mediante un diseño completamente azar con tres repeticiones y como factor principal tres dietas cuyos componentes fueron : dieta 1 40% heno de alfalfa + 60% heno de sorgo, dieta 2 40% nopal seco natural + 60 % heno de sorgo y dieta 3 40% nopal seco enriquecido co n proteínas + 60% heno de sorgo . Los resultados mostraron que la dieta de nopal enriquecido con proteínas y la dieta de nopal seco natural poseen una calidad nutritiva mayor, pero las condiciones de secado y/o almacenamiento tuvieron efecto en la calidad de l os componentes de las dietas evaluadas. La ganancia de peso vivo fue mayor en cabras alimentadas con la dieta de nopal - E , pero el porcentaje de alimento rechazado (menor palatabili dad fue mayor para esta dieta. La ganancia de peso vivo fue menor en alfalfa y nopal seco natural , respectivamente . La ganancia de peso y el tiempo de alimentación mostraron correlación positiva y significativa ; sin embargo, se debe determinar el tiempo óptimo de alimentación y evaluar el costo - beneficio de las dietas utilizadas.

  2. 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.

  3. 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.

  4. Dieta Mediterránea, una historia de sabor, salud y sostenibilidad

    OpenAIRE

    Carbajal Azcona, Ángeles

    2015-01-01

    Existe abundante evidencia científica del papel de la Dieta Mediterránea tradicional y de sus componentes en la Salud y la Sostenibiliad. La Dieta Mediterránea es un dieta sana, nutritiva y palatable, relacionada con la prevención de las enfermedades crónicas y con una menor morbi-mortalidad y mayor esperanza y calidad de vida. Pero no sólo es un modelo de alimentación sana para el hombre sino también para el medio ambiente. Por estar basada fundamentalmente en el consumo de alimentos de orig...

  5. Evidencias científicas sobre la eficacia y seguridad de la dieta proteinada. Dieta proteinada y ejercicio físico

    Directory of Open Access Journals (Sweden)

    J. Saura

    2014-03-01

    Full Text Available La obesidad se ha convertido en una pandemia a nivel mundial, 2,8 millones de personas mueren cada año como resultado de padecer sobrepeso u obesidad, según ha declarado la Organización Mundial de la Salud (OMS. Dentro del marco de las estrategias para combatir la obesidad, encontramos diferentes propuestas dietéticas y de actividad física. En el marco de las dietas muy bajas en calorías (VLCD, encontramos la dieta proteinada, una variedad de dieta cetogénica (KD con un aporte mínimo de grasas, de acuerdo a las indicaciones del grupo de consenso y cooperación de los estados miembros en materia de examen científico sobre cuestiones relacionadas con los alimentos (SCOOP para la aplicación de una dieta muy baja en calorías. El objetivo de esta revisión científica es recopilar las evidencias científicas que valoren la efectividad, seguridad y mantenimiento a largo plazo de los efectos de las VLCD, y en concreto de la dieta proteinada, aplicada en el marco de un método multidisciplinar como el método Pronokal®, sobre el sobrepeso y la obesidad y su relación con el ejercicio físico.

  6. Óleo funcional na dieta de vacas leiteiras

    OpenAIRE

    Jesus, Elmeson Ferreira de [UNESP

    2015-01-01

    O presente estudo teve como objetivo avaliar os efeitos da inclusão de óleo funcional composto de ácido anacárdico, cardol e cardanol (óleo da castanha de cajú) e ácido ricinoleico (óleo de mamona) na dieta de vacas em lactação sobre consumo, digestibilidade aparente total da matéria seca e nutrientes, fermentação ruminal, produção e composição do leite, síntese de proteína microbiana, perfil metabólico, balanço de nitrogênio e energia. Foram utilizadas vinte e quatro vacas pluriparas da raça...

  7. Dieta cetogênica no tratamento de epilepsias farmacorresistentes

    OpenAIRE

    Nonino-Borges,Carla Barbosa; Bustamante,Vera Cristina Terra; Rabito,Estela Iraci; Inuzuka,Luciana Midoro; Sakamoto,Américo Ceike; Marchini,Júlio Sérgio

    2004-01-01

    A epilepsia é uma condição clínica crônica correspondente a um grupo de doenças que tem em comum crises epilépticas; ela atinge de 0,5% a 1,0% da população dos países desenvolvidos, podendo esta prevalência ser maior nos países em desenvolvimento. Aproximadamente um terço dos pacientes evolui com crises epilépticas intratáveis com medicamentos; em alguns casos, é possível o tratamento cirúrgico. Nos pacientes em que cirurgia não é possível, a dieta cetogênica passa a ser uma opção terapêutica...

  8. Dieta afro-bahiana, estrés oxidativo y ejercício físico Afro-bahian diet, stress and exercise

    Directory of Open Access Journals (Sweden)

    Mírian Rocha Vázquez

    2006-12-01

    Full Text Available OBJETIVO: El objetivo de este trabajo fue estudiar el efecto de la dieta afro-bahiana sobre el estrés oxidativo inducido por el ejercicio físico extenuante en 17 individuos jóvenes y saludables. MÉTODOS: La dieta afro-bahiana se compone principalmente de carne roja, aceite de palma, zumo de frutas, raíces, harina de mandioca y cereales. El control alimenticio se extendió por 4 meses. Antes del control alimenticio, se retiraron muestras de sangre en estado basal y cinco minutos después de un ejercicio físico extenuante en tapiz rodante. El mismo procedimiento fue seguido después del control alimenticio. Para analizar el efecto de la dieta y del ejercicio físico extenuante se compararon los indicadores antioxidantes, catalasa y superóxido dismutasa y el estrés oxidativo por la peroxidación lipídica, determinada por el análisis del malonaldeído en eritrocitos. RESULTADOS: Los resultados muestran que la dieta, en condición de reposo, no influenció significativamente el estatus antioxidante de las enzimas catalasa y superóxido dismutasa ni la concentración de análisis del malonaldeído. Se observa, no obstante, que después de un ejercicio físico extenuante, la actividad de la catalasa, tanto con dieta libre como después de la dieta afro-bahiana, aumentó de forma significativa (pOBJECTIVE: The aim of this study was to observe the protective role of a diet based on the culinary culture of Bahia State against an oxidative stress induced by strenuous exercise in 17 young and healthy individuals. METHODS: Meat, palm oil, fruit juices, roots, manioc flour and cereals are the main constituents of this diet. Dietary control had a span of four months. Before the dietetic regime started blood samples were collected from each individual both at rest and also five minutes after a bout of strenuous exercise. Samples were collected again both at rest and after the bout of strenuous exercise at the end of the dietary intervention. RESULTS

  9. con dietas suplementadas con Cromo-L-metionina

    Directory of Open Access Journals (Sweden)

    Ram\\u00F3n Garc\\u00EDa-Castillo

    2006-01-01

    Full Text Available Un total de 48 cerdos (Sus scrofa domesticus; 24 machos castrados y 24 hembras cruzados (Yorkshire, Hampshire, Duroc y Landrace de 3,5 a 4,0 meses de edad y 60,0 ± 5,0 kg PV en finalización. Se alimentaron con dietas isoproteícas (14,5 % PC e isoenergéticas (3.400 kcal EM/kg de MS, adicionadas con Cr-L-metionina (MiCroPlex® (0, 200, 400 y 600 ppb. El experimento tuvo una duración de 45 días y se realizó de agosto a noviembre del 2002 en las instalaciones de la Universidad Autónoma Agraria Antonio Narro, localizada en Saltillo, Coahuila, México. Al tener los animales aproximadamente 95 kg PV, se tomó muestra de 15 ml de sangre por cada animal para determinar la concentración de glucosa, ácido úrico, creatinina, urea, proteinas totales y colesterol. Se aplicó un diseño completamente al azar con arreglo factorial 2 x 4; dos para el factor sexo y cuatro para nivel de cromo. Los metabolitos en suero no fueron afectados (P>0,05 por el factor sexo. La glucosa en suero disminuyó (P<0,05 y el colesterol incrementó (P<0,05 con cromo en la dieta. Se concluye que el Cr incrementa el metabolismo de glucosa y disminuye el de colesterol, con lo cual puede haber energía disponible para síntesis de proteína la cual es necesaria para el crecimiento de los animales

  10. 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...

  11. Efeito da dieta hiperlipídico-protéica no metabolismo de ratos wistar adultos

    OpenAIRE

    Borba, Alberto José de

    2008-01-01

    O consumo de dietas com pouco carboidrato e rica em proteínas e gorduras faz parte do rol de dietas usadas para a perda de peso. A princípio, essas dietas levam à mobilização de triglicerídeos para a produção de corpos cetônicos e manutenção das funções corporais. O presente trabalho testou o efeito de uma dieta hiperlipídico-protéica (HLP) com baixo teor de carboidrato sobre o peso corporal, peso dos órgãos, consumo de ração, parâmetros bioquímicos séricos e alterações histopatológicas...

  12. Dieta cetogénica como tratamiento de la epilepsia refractaria

    OpenAIRE

    Barrena Barbadillo, Rocío

    2016-01-01

    Trabajo final de máster en el que se analiza la efectividad de la dieta cetogénica como tratamiento para la epilepsia refractaria a fármacos. Análisis de las diferentes dietas cetogénicas existentes, mecanismo de acción, efectividad, indicaciones, contraindicaciones efectos adversos e implementación de la dieta. Treball final de màster en el qual s'analitza l'efectivitat de la dieta cetogènica com a tractament per l'epilèpsia refractària a fàrmacs. Anàlisi de les diferents dietes cetogèniq...

  13. 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 ...

  14. 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....

  15. Development of Myrmeleon brasiliensis (Navás (Neuroptera, Myrmeleontidae, in laboratory, with different natural diets Desenvolvimento de Myrmeleon brasiliensis (Navás (Neuroptera, Myrmeleontidae, em laboratório, com diferentes dietas naturais

    Directory of Open Access Journals (Sweden)

    Giani L. B. Missirian

    2006-12-01

    Full Text Available Antlions larvae are sit-and-wait predators that capture arthropod prey in conical sand pits. The aim of this paper were to determine the effect of different natural diets [leaf-cutting ants (Atta spp., fruit fly larvae (Anastrepha spp. and Ceratitis capitata and mixed diet (Atta spp. plus fruit fly larvae] on the development of larvae and pupae of M. brasiliensis (Navás, 1914 and to estimate the number and size of prey caught in each instar and on each kind of diet. The average duration (days of the second and third instars of M. brasiliensis was longer when larvae of antlion were fed with leaf-cutting ants. The diets did not affect the duration of the pupal stage nor the pupae size. The different diets did not affect the mean width of head capsule (mm, the mean weight (mg or the mean body size (mm in the different instars of M. brasiliensis. In the second and third instars, the larvae of M. brasiliensis fed with leaf-cutting ants consumed more prey than larvae kept on other diets. Adults whose larvae were fed fruit fly larvae were larger than adults on other diets. Although Myrmeleontidae are few studied in Brazil, these results contribute to knowledge of M. brasiliensis biology, but also suggest the need of studies about the development of larvae and pupae in natural environments.Larvas de formiga-leão são conhecidas por suas armadilhas ("funis" que constroem em solo arenoso, sob as quais esperam por suas presas. Este trabalho teve como objetivos verificar o efeito de diferentes dietas naturais [formigas-cortadeiras (Atta spp., larvas de moscas-das-frutas (Anastrepha spp. e Ceratitis capitata e dieta mista (Atta spp. e larvas de moscas-das-frutas] sobre o desenvolvimento larval e pupal de M. brasiliensis (Navás, 1914 e estimar o número e tamanho de presas capturadas, por instar larval, em cada dieta. No segundo e terceiro instares, as larvas de M. brasiliensis alimentadas com formigas-cortadeiras consumiram um número maior de presas e a

  16. Variaciones en la dieta de universitarios gallegos (campus de Ourense) con relación al patrón cardioprotector de la dieta mediterránea

    OpenAIRE

    Montserrat Míguez Bernárdez; Laura Castro Sobrino; Ashleigh Collins Greene; Julia de la Montaña Miguélez

    2013-01-01

    Diversos estudios epidemiológicos previos han postulado que una alta adecuación a la dieta Mediterránea está asociada con un menor riesgo cardiovascular, pero también se evidenciaron, en la literatura científica, cambios en los hábitos dietéticos de los países mediterráneos que ponen de manifiesto un alejamiento de los patrones mediterráneos. El objetivo de este trabajo fue estudiar las variaciones en la dieta de universitarios gallegos (Campus de Ourense), entre 2011 y 2013, con relación a l...

  17. 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....

  18. 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....

  19. Utilización del cobre en dietas hipograsas

    Directory of Open Access Journals (Sweden)

    Aguirre, M.

    1996-12-01

    Full Text Available The objective of this study was to investigate both the dietary copper utilization and the body copper content in rats fed either low fat diets (2% or normal fat diets (8% containing olive oil, sunflower oil and palm oil (olein fraction, by two different balance techniques. Seven groups of Wistar rats were used. One group was killed on the first experimental day being utilized as control of initial body copper content. Six groups of rats were fed, over 15 days, semipurified diets varying only in the fat level, three of them containing 8% of fat, and the other three 2%. The overall copper balance was studied by calculating differences between the initial and final body copper content. During the last week, another copper balance was carried out by monitoring intake and faecal copper excretion. Body mass, and liver, spleen, skin, erythrocytes and serum copper contents were also examined. The copper utilization was lower in 2% fat rats, this was caused by food intake decrease but also by the lower copper bioavailability in 2% fat diets. The corporal, liver and spleen copper contents were reduced, and liver, skin and serum copper concentrations also decreased in the rats fed on 2% fat diets. Palm olein (8% versus olive and sunflower oil produced a lower efficiency of copper absorption.

    Se propuso estudiar la influencia del consumo de dietas pobres en grasa a base de aceite de oliva, girasol o aceite de palma (fracción oleína sobre la utilización del cobre dietético por dos técnicas diferentes de balance, así como sobre sus contenidos corporales. Se utilizaron siete grupos de ratas Wistar, uno de ellos sacrificado el día primero del experimento, sirvió como control del contenido cúprico corporal inicial; seis grupos de ratas fueron alimentadas durante 15 días con dietas semisintéticas, tres de ellos con las grasas al 8% y los otros tres al 2%. En ellos se estudió el balance global del cobre mediante diferencia entre los

  20. 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.

  1. Intervenções em Dieta e Pressão Arterial na América Latina - Revisão Sistemática e Meta-Análise

    Directory of Open Access Journals (Sweden)

    Caroline Cantalejo Mazzaro

    2014-04-01

    Full Text Available Fundamento: Pressão arterial elevada é o principal fator de risco para doenças cardiovasculares. Baixos índices de controle da pressão arterial em populações latino-americanas reforçam a necessidade de reunir evidências sobre terapias eficazes. Objetivo: Avaliar o efeito das intervenções de modificações de dietas sobre pressão arterial em populações latino-americanas. Métodos: Revisão sistemática. Foram pesquisadas diversas bases de dados (MEDLINE-PubMed, Embase, Cochrane Library, CINAHL, Web of Science, Scopus, SciELO, LILACS e BVS e realizada busca manual até abril de 2013. Foram incluídos estudos paralelos de intervenções em dieta em populações adultas da América Latina reportando pressão arterial (em mmHg antes e após a intervenção. Resultados: Dos 405 estudos encontrados, 10 ensaios clínicos randomizados foram incluídos e divididos em 3 subgrupos, de acordo com a dieta proposta como intervenção. Houve redução não significativa da pressão arterial sistólica nos subgrupos de substituição mineral -4,82 (IC 95%: -11,36 a 1,73 mmHg e padrões complexos -3,17 (IC 95%: -7,62 a 1,28 mmHg. Para a pressão arterial diastólica, com exceção do subgrupo de dietas hiperproteicas, todos os subgrupos apresentaram redução significativa, com -4,66 (IC 95%: -9,21 a -0,12 mmHg e -4,55 (IC 95%: -7,04 a -2,06 mmHg para substituição mineral e padrões complexos, respectivamente. Conclusão: A evidência disponível sobre os efeitos de alterações de dieta na pressão arterial em populações latino-americanas indica um efeito homogêneo, porém não significativo, para pressão arterial sistólica. Estudos maiores e com maior rigor metodológico são necessários para construção de evidência robusta.

  2. 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.

  3. 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...

  4. 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

  5. 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.

  6. 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...

  7. 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...

  8. 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.

  9. 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.

  10. 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.

  11. 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.

  12. 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...

  13. 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...

  14. 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...

  15. Dieta de Leptodactylus latrans (Steffen, 1815 na Serra do Sudeste, Rio Grande do Sul, Brasil

    Directory of Open Access Journals (Sweden)

    Daiane Maria Melo Pazinato

    2011-08-01

    Full Text Available http://dx.doi.org/10.5007/2175-7925.2011v24n4p147 Esse trabalho descreve a dieta de Leptodactylus latrans baseado no conteúdo estomacal de 37 espécimes procedentes do município de Caçapava do Sul, RS, tendo como objetivo analisar qualitativa e quantitativamente essa dieta. As amostras foram coletadas no período de janeiro de 2007 a fevereiro de 2008. A composição da dieta foi analisada sob estereomicroscópio e identificada até o nível de ordem, estando composta por 17 categorias de presas. Coleoptera e Aranae foram os itens mais frequentes com 55% e 22,5% respectivamente. Volumetricamente os itens mais importantes foram Crustacea, Decapoda (15,5% e Amphibia (13,59%.

  16. Efeitos de uma dieta hiperproteica a nível renal

    OpenAIRE

    Oliveira, Hugo Manuel Pedrosa de

    2008-01-01

    Apesar de já existirem há vários anos, a popularidade das dietas hiperproteicas tem vindo a aumentar devido às proporções epidémicas da obesidade a nível mundial. Mesmo com o seu uso generalizado, existem preocupações válidas de que estas dietas possam induzir alteração clinicamente importantes a nível da função e da saúde renal. O uso destas dieta têm sido correlacionado com hiperfiltração glomerular e hiperemia, aceleração do declínio de doença renal crónica, aumento da pr...

  17. 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

  18. 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.

  19. Dietas larvais alternativas para criação massal da mosca da bicheira, Cochliomyia hominivorax

    Directory of Open Access Journals (Sweden)

    Thiago Mastrangelo

    2014-04-01

    Full Text Available A criação massal da mosca da bicheira, Cochliomyia hominivorax (Diptera: Calliphoridae, para programas que utilizam a Técnica do Inseto Estéril nas Américas faz parte de um dos maiores programas do mundo de criação de insetos em larga escala. A maior parte do custo e do trabalho necessários para a produção massal está relacionada com a dieta larval, o que torna importante o seu aprimoramento levando-se em conta sua eficiência, custo e praticidade. Neste trabalho, foram realizados dois bioensaios com dietas alternativas feitas a partir de produtos disponíveis no mercado brasileiro com o objetivo de avaliar a viabilidade e eficiência dessas dietas para criações de mosca da bicheira no Brasil. Foram testadas duas dietas líquidas (tendo como bulking agents bagaço de cana ou fibra de coco, uma de carne, e outra de gel. Os parâmetros biológicos (peso das larvas, viabilidade larval, peso de pupas, porcentagem de emergência de adultos e razão sexual estiveram, em todos os casos, dentro de parâmetros satisfatórios para a criação laboratorial de C. hominivorax e as dietas não diferiram estatisticamente entre si. Devido a vantagens importantes, como alta viabilidade larval e menor custo, recomenda-se a dieta de gel para as criações de larvas da mosca da bicheira no Brasil.

  20. Consumo e desempenho produtivo de ovinos alimentados com dietas que continham coprodutos do desfibramento do sisal

    Directory of Open Access Journals (Sweden)

    R.D. Santos

    2011-12-01

    Full Text Available Avaliaram-se o desempenho produtivo e o consumo de nutrientes e frações fibrosas em ovinos alimentados com dietas contendo coprodutos do desfibramento do sisal, Agave sisalana. Foram utilizados 24 ovinos, machos, alojados em baias individuais. O delineamento experimental utilizado foi o inteiramente ao acaso, com quatro tratamentos e seis repetições. Os tratamentos consistiram em quatro dietas isoproteicas, em que: i dieta padrão, contendo 38% de volumoso (silagem de milheto e 62% de concentrado (milho, farelo de soja e ureia; ii inclusão de 20% da silagem de mucilagem do sisal em substituição à silagem de milheto; iii inclusão de 20% da silagem de mucilagem associada ao pó da batedeira como aditivo em substituição à silagem de milheto; iv inclusão de 20% do feno da mucilagem em substituição à silagem de milheto. O peso corporal final, os ganhos médio diário e total e a conversão alimentar dos ovinos não foram influenciados pelas dietas avaliadas (P>0,05. Os consumos dos nutrientes, em g/dia e em %PC e g/kg0,75, não sofreram influência das dietas. Os resultados indicam que as dietas à base de coprodutos do sisal podem ser utilizadas como alternativa volumosa, além de possibilitar o aumento da rentabilidade da atividade na região semiárida brasileira.

  1. Uso de alimento vivo como dieta inicial no treinamento alimentar de juvenis de pirarucu

    Directory of Open Access Journals (Sweden)

    Cavero Bruno Adan Sagratzki

    2003-01-01

    Full Text Available O objetivo deste trabalho foi testar a eficiência do alimento vivo como dieta inicial no treinamento alimentar de juvenis de pirarucu, Arapaima gigas. Foram usados dois tratamentos, Artemia sp. e mistura de zooplâncton nativo. O ganho de peso, a porcentagem de comedores e a sobrevivência não apresentaram diferença estatística significativa entre os tratamentos (p>0,05. A dieta inicial, à base de alimento vivo, é eficiente no treinamento alimentar de juvenis de pirarucu.

  2. Las grasas en la dieta materna, edad gestacional y peso al nacer

    OpenAIRE

    Rodríguez Enríquez, Yanik; Pita Rodríguez, Gisela; González, Isabel Martín; Ferret Martínez, Ana; Puentes Márquez, Ileana

    2004-01-01

    Las grasas en la dieta materna tienen funciones determinantes en el desarrollo de un embarazo normal, en la estructuración de un adecuado flujo útero-placentario, la formación de membranas celulares, el crecimiento intrauterino del feto y el desarrollo del sistema nervioso central. El objetivo de este trabajo fue medir la relación entre la composición de ácidos grasos en la dieta materna atendiendo a la edad gestacional y el peso al nacer de los recién nacidos. Se realizó un estudio transvers...

  3. Uso de alimento vivo como dieta inicial no treinamento alimentar de juvenis de pirarucu.

    OpenAIRE

    CAVERO, B.A.S.; ITUASSÚ, D.R.; PEREIRA-FILHO, M.; ROUBACH, R.; BORDINHON, A.M.; FONSECA, F.A.L. da; ONO, E.A.

    2003-01-01

    O objetivo deste trabalho foi testar a eficiência do alimento vivo como dieta inicial no treinamento alimentar de juvenis de pirarucu, Arapaima gigas. Foram usados dois tratamentos, Artemia sp. e mistura de zooplâncton nativo. O ganho de peso, a porcentagem de comedores e a sobrevivência não apresentaram diferença estatística significativa entre os tratamentos (p>0,05). A dieta inicial, à base de alimento vivo, é eficiente no treinamento alimentar de juvenis de pirarucu.

  4. 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.

  5. 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 ...

  6. 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

  7. 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.

  8. 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.

  9. 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.

  10. 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.

  11. 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

  12. 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.

  13. 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.

  14. Individual Recognition in Ant Queens

    DEFF Research Database (Denmark)

    D'Ettorre, Patrizia; Heinze, Jürgen

    2005-01-01

    Personal relationships are the cornerstone of vertebrate societies, but insect societies are either too large for individual recognition, or their members were assumed to lack the necessary cognitive abilities 1 and 2 . This paradigm has been challenged by the recent discovery that paper wasps...... recognize each other's unique facial color patterns [3] . Individual recognition is advantageous when dominance hierarchies control the partitioning of work and reproduction 2 and 4 . Here, we show that unrelated founding queens of the ant Pachycondyla villosa use chemical cues to recognize each other...... 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...

  15. 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.

  16. 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.

  17. Estudo randomizado para avaliação da dieta hipolipídica nos sintomas digestivos no pós-operatório imediato da colecistectomia por videolaparoscopia

    Directory of Open Access Journals (Sweden)

    Hunaldo Lima de Menezes

    Full Text Available OBJETIVO: Validar a necessidade da prescrição da dieta hipolipídica na prevenção ou redução dos sintomas dispépticos no período pós-operatório de pacientes submetidos à colecistectomia por videolaparoscopia. MÉTODOS: Foram selecionados 40 pacientes, distribuídos em dois grupos, isentos de doenças hepáticas, pancreáticas, litíase da via biliar, gastrite, úlcera, diabetes e dislipidemia. Foi realizado anamnese alimentar, identificação de dispepsias antes do aparecimento da colelitíase e orientações sobre a conduta alimentar no pós-operatório (normal ou hipolipídica. Foi utilizado o teste chi-square e a correlação de Pearson, considerando pd"0,05 como significância estatística. RESULTADOS: Comparando-se os dois grupos de pacientes sem dispepsias no pré-operatório, observou-se que no grupo I, sete pacientes (63,6% permaneceram assintomáticos e no grupo II, quatro (66,7%. No grupo I, em quatro (36,4% houve aparecimento de sintomas e no grupo II, em dois (33,3%, logo p=0,684. Correlacionando-se os dois grupos dispépticos no pré-operatório, observou-se que houve permanência, aparecimento ou desaparecimento dos sintomas no pós-operatório, sendo p=0,114. CONCLUSÃO: Não houve repercussão significativa da dieta hipolipídica na prevenção dos sintomas dispépticos, principalmente nos pacientes assintomáticos no pré-operatório. Sendo assim, não há necessidade em se orientar uma dieta hipolipídica. De modo que, cabe ao cirurgião avaliar cada paciente individualmente e ajustar a dieta às necessidades do paciente e às condições clínicas associadas.

  18. 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.

  19. 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.

  20. 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.

  1. Alterações clínicas e laboratoriais em equinos adaptados a dieta com nível elevado de concentrado e submetidos à sobrecarga dietética com amido

    Directory of Open Access Journals (Sweden)

    Tiago Marques dos Santos

    2011-04-01

    Full Text Available Este trabalho teve como objetivo avaliar o efeito da sobrecarga dietética com amido em equinos adaptados a dieta com nível elevado de concentrado. Seis equinos adultos foram previamente adaptados à dieta composta por feno de coast cross e concentrado na proporção de 60:40 e, posteriormente submetidos à infusão gástrica de 17,6 g amido/kg de peso corporal. Os equinos foram avaliados por meio de exames clínicos e laboratoriais até 36 horas após a sobrecarga. Um equino veio a óbito 32 horas após a sobrecarga, apresentando quadro clínico de endotoxemia e laminite. Não houve diferença (P > 0,05 nas frequências cardíaca e respiratória, temperatura retal, tempo de preenchimento capilar e temperatura superficial dos cascos dos equinos durante o experimento. Houve tendência ao aumento na motilidade intestinal, seguido de aumento na fluidez das fezes. O volume globular e a concentração de proteína plasmática total aumentaram (P < 0,05 24 horas após a sobrecarga quando comparados aos valores basais, de 26,7 a 32,0% e de 7,1 e 8,1 g/dL, respectivamente. Os neutrófilos bastonetes aumentaram (P < 0,05 durante o período de avaliação, com valores variando de 0,1 a 0,7 x 10(3/µL antes da sobrecarga e 24 horas após, respectivamente, enquanto os eosinófilos apresentaram redução. A concentração plasmática de lactato teve aumento discreto com diferença (P < 0,05 antes, 20 e 28 horas após a sobrecarga, com valores de 0,7, 1,0 e 1,2 mmol/L, respectivamente. Conclui-se que equinos consumindo dieta com elevado nível de concentrado e submetidos à sobrecarga dietética com amido apresentam alterações clínicas e laboratoriais moderadas, porém, casos graves, seguidos do óbito, podem ocorrer devido à variação individual.

  2. Dieta habitual e fatores de risco para doenças cardiovasculares

    Directory of Open Access Journals (Sweden)

    Ana Maria Cervato

    1997-06-01

    Full Text Available INTRODUÇÃO: Estudo descritivo por amostragem em munícípio do Estado de São Paulo, Brasil, em 1990, com objetivo de analisar, mediante entrevistas domiciliares, a dieta habitual e fatores de risco para doenças cardiovasculares em indivíduos maiores de 20 anos. METODOLOGIA: Foram entrevistados 557 indivíduos, de idade entre 20 e 88 anos, que fazem parte de subamostra de um estudo global na região. A dieta habitual, identificada pelo histórico alimentar foi comparada às recomendações da OMS e os fatores de risco estudados (obesidade, dislipidemias, diabetes melito diagnosticados pelo Índice de Massa Corpórea e dosagens bioquímicas. RESULTADOS E CONCLUSÕES: Observou-se que 60% da população consome dieta com energia total abaixo da estimativa das necessidades e que a contribuição calórica dos carboidratos foi de 56%, dos lipídios de 29% e das proteínas de 15%. Entretanto, na análise por percentil, a contribuição calórica dos lipídios e das proteínas encontra-se muito acima dos padrões recomendados em detrimento dos carboidratos. A energia, distribuição calórica e quantidade de colesterol foi adequada em apenas 5% das dietas. Dentre os fatores de risco para doenças cardiovasculares estudados observou-se a prevalência de obesidade em 38% dos indivíduos, de dislipidemias em 26% e de diabetes melito em 5%. A atividade física leve preponderante com dieta inadequada, tanto em termos de qualitativos quanto quantitativos, agravam ainda mais esse quadro.

  3. AVALIAÇÃO DA DISPONIBILIDADE DO FERRO EM DIETA COMPLEMENTADA COM COUVE MANTEIGA

    Directory of Open Access Journals (Sweden)

    K. OLIVEIRA-CALHEIROS

    2008-12-01

    Full Text Available

    O objetivo desse trabalho foi avaliar a disponibilidade de ferro em uma dieta típica consumida em restaurantes tipo self-service no Estado de São Paulo e verificar se a adição de porções de couve manteiga nesta dieta aumenta a disponibilidade de ferro dietético. Foi determinada a composição centesimal, teor de fi bras, ferro e diálise de ferro in vitro da dieta e suas misturas com couve crua ou cozida em diferentes porções (0,5, 1,0, 1,5 e 2,0. Os resultados da composição centesimal evidenciaram diferenças entre tratamentos, com ênfase para os teores de fi bras com a adição de couve crua (p=0,05, sendo maior em relação à adição de couve cozida. Ocorreram aumentos signifi cativos dos teores de lipídios, proteína e cinzas, com o aumento de porções de couve. O teor e a disponibilidade de ferro no tratamento com couve crua se apresentaram superiores. A comparação entre couve crua e cozida também demonstrou maior disponibilidade de ferro para couve crua. A dieta sem adição de couve apresentou disponibilidade de 0,18% para ferro enquanto que com a adição de couve crua apresentou disponibilidade de 0,30%. Conclui-se que a introdução de couve manteiga na dieta pode trazer benefícios como aumento do teor e da disponibilidade de ferro.

  4. Fuentes de Carbohidratos no tradicionales y su efecto en la digestibilidad de dietas para camarones litopenaeus vannamei

    OpenAIRE

    Gómez, Mauricio; Molina, César

    2001-01-01

    Fuentes de carbohidratos no tradicionales y su efecto en la digestibilidad de dietas para camarones Litopenaeus vannamei Hasta la fecha los alimentos para organismos acuáticos han sido generalmente evaluados en términos de crecimiento y de composición corporal de los animales, confiriendo poca atención a la digestibilidad de los ingredientes o de las dietas compuestas y mucho menos a las posibles interacciones que pueden darse entre niveles de nutrientes presentes en la dieta.

  5. Proteínas da soja processadas de diferentes modos em dietas para desmame de leitões

    OpenAIRE

    Bertol,Teresinha Marisa; Mores,Nelson; Ludke,Jorge Vítor; Franke,Márcia Regina

    2001-01-01

    Foi realizado um experimento para avaliar a substituição parcial do farelo de soja (FS) por outros subprodutos da soja obtidos por intermédio de diferentes tipos de processamento, bem como comparar estes subprodutos entre si, como fonte protéica na dieta de leitões desmamados aos 21 dias de idade. Com este objetivo foram comparados quatro tratamentos: T1 - dieta controle, com FS como única fonte protéica; T2, T3 e T4 -- 50% do FS da dieta controle foi substituído por soja integral extrusada (...

  6. FONTES PROTÉICAS DE ORIGEM VEGETAL EM DIETAS PARA JUVENIS DE CARPA HÚNGARA (Cyprinus carpio)

    OpenAIRE

    Giovani Taffarel Bergamin

    2009-01-01

    O objetivo deste trabalho foi avaliar a resposta de diferentes fontes protéicas de origem vegetal em substituição à farinha de carne suína da dieta, sobre o crescimento, rendimento e qualidade de carcaça, parâmetros sangüíneos e avaliação sensorial dos filés de juvenis de carpa húngara. Foram realizados dois experimentos, utilizando sistema de recirculação de água com 15 unidades experimentais (280L). No experimento 1, foram avaliadas cinco dietas experimentais. Uma dieta controle (FCS) co...

  7. 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 ...

  8. 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...

  9. 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

  10. 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....

  11. 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. ...

  12. 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

  13. 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...

  14. 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...

  15. Toxic industrial deposit remediation by ant activity

    Science.gov (United States)

    Jilkova, Veronika; Frouz, Jan

    2016-04-01

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

  16. 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.

  17. 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.

  18. Sustitución de alimento concentrado, con morera fresca (Morus alba, en la dieta de vacas lecheras

    Directory of Open Access Journals (Sweden)

    Carlos Boschini

    2003-01-01

    Full Text Available Se experimentaron cuatro dietas balanceadas con sustitución de alimento concentrado por la inclusión de 0, 20, 40 y 60% de materia seca de hojas de morera de 84 días. El consumo de materia seca total fue de 3,12 a 3,24% con relación al peso vivo. No se apreciaron diferencias importantes (P≥0,05 en el consumo total de MS entre vacas dentro de un mismo tratamiento. En la dieta sin morera (0%, el forraje constituyó el 42% y en la dieta con 60% de morera constituyó el 86% de la materia seca. El consumo de morera fue cercano a 2% en la dieta con 60%. La tasa de sustitución fue de 677 g/animal- /día de materia seca de concentrado por cada kilogramo de materia seca de morera agregada a la dieta, más la sustitución de 323 g/animal/día del sorgo negro forrajero y de la soja en mezcla para los dietas que contienen esta última. El reemplazo de proteína fue de 576 g/animal/día del concentrado y 424 g/animal/día del sorgo negro forrajero y soja por cada kilogramo de proteína cruda de morera adicionada. Cada megacalor ía de energía digestible de morera agregada a la dieta sustituyó 0,675 mcal/animal/día de energía del concentrado y 0,325 mcal/animal/día de la mezcla sorgo negro forrajero y soja. Se encontraron diferencias (P0,05 entre el peso inicial y final de los animales y las variaciones de producción de leche diaria fueron de pequeña magnitud dentro de dietas.

  19. Mananoligossacarídeos em dietas para frangos de corte Mannanoligosaccharides in diets for broilers

    Directory of Open Access Journals (Sweden)

    Nei André Arruda Barbosa

    2011-12-01

    Full Text Available Objetivou-se avaliar dietas contendo mananoligossacarídeos (MOS como aditivo alternativo aos promotores de crescimento por meio do estudo da morfometria do intestino e do desempenho de frangos de corte. Para tanto, 1280 pintos de corte foram distribuídos em delineamento inteiramente casualizado com quatro tratamentos (controle negativo, CN: dieta isenta de antibiótico; controle positivo, CP: dieta contendo antibiótico e duas dietas, MOS 1 e MOS 2, nas quais foram adicionadas ao CN duas fontes distintas de MOS e oito repetições, sendo a unidade experimental composta por 40 aves. Para submeter as aves ao desafio sanitário, foi formulada uma dieta basal com milho, farelo de soja e farinha de carne e ossos. Adotou-se cama reutilizada, limpeza dos bebedouros duas vezes por semana e oferta semanal de água contaminada com cama. Foram avaliadas altura de vilo e profundidade de cripta do duodeno, jejuno e íleo, consumo da dieta, peso médio, ganho de peso e conversão alimentar das aves. Houve melhora na profundidade de cripta no jejuno e na altura de vilo no íleo das aves alimentadas com dietas contendo MOS. A adição de MOS, independente da fonte, resultou em melhor conversão alimentar em relação às aves do CN, sendo similares às aves do CP. Os mananoligossacarídeos podem ser utilizados como aditivo alternativo aos promotores de crescimento em dietas para frangos de corte, porém, dependendo da fonte, esta pode acarretar em pequenas diferenças no desempenho das aves.This study aimed to evaluate mannan oligosaccharides (MOS as an alternative additive to growth promoters in broiler diets by studying the morphology of the intestine and the performance. For this purpose, 1280 broiler chicks were distributed in a completely randomized design with four treatments (negative control, NC: diet free of antibiotics; positive control, PC: diet with antibiotic and two diets, MOS 1 and MOS 2, in which were added to NC two distinct sources of MOS

  20. DIETAS DE ALTA PROPORÇÃO DE CONCENTRADO PARA BOVINOS DE CORTE CONFINADOS

    OpenAIRE

    SILVA, Hélio Lourêdo da

    2009-01-01

    O objetivo deste trabalho foi de avaliar os efeitos de dietas de alta proporção de concentrado, sobre os desempenhos e características de carcaça, comportamento ingestivo e indicadores fecais de 20 bovinos Nelore, com idade de 28 meses. As dietas DT+BIN (10% de bagaço de cana in natura , 54,52% de sorgo moído, 10,94% de caroço de algodão, 18% de casca de soja, 2,54% de farelo de soja e 4% de núcleo farelado), MGI (10% de casca de soja, 75% de milho grão e 15% de núcleo peletizado) e DT (44,4...

  1. Ácidos grasos en la dieta diabetes mellitus e insulino resistencia

    Directory of Open Access Journals (Sweden)

    Clara Eugenia Pérez G.

    2006-04-01

    Full Text Available La resistencia a la insulina es característica de la diabetes mellitus tipo 2. Como parte del tratamiento se recomienda los diabéticos, sustituir en las dietas los ácidos grasos saturados y el colesterol por ácidos grasos monoinsaturados; sin que estén del todo claro los mecanismos bioquímicos que beneficiarían a los pacientes. Es probable, entre otros mecanismos, que los ácidos grasos monoin­saturados aumenten la sensibilidad a la insulina. Esta revisión analiza la relación entre el tipo de ácido graso en la dieta y la resistencia a insulina en la diabetes mellitus tipo 2.

  2. 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...

  3. 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.

  4. Acne e dieta: verdade ou mito? Acne and diet: truth or myth?

    Directory of Open Access Journals (Sweden)

    Adilson Costa

    2010-06-01

    Full Text Available Nos últimos 50 anos, foram publicados inúmeros estudos com a finalidade de comprovar se a dieta está relacionada à etiologia da acne. Embora existam estudos antigos, que são bem difundidos entre os dermatologistas e negam a associação entre acne e dieta, seu delineamento científico é pobre. Recentemente, novos artigos demonstraram evidências contrárias às publicações anteriores. Sendo assim, os autores realizaram esta revisão bibliográfica com o intuito de averiguar se a dieta influencia direta ou indiretamente um ou mais dos quatro pilares etiopatogênicos fundamentais da acne: (1 hiperproliferação dos queratinócitos basais, (2 aumento da produção sebácea, (3 colonização pelo Propionibacterium acnes e (4 inflamação.Numerous studies were published over the last 50 years to investigate whether diet is associated with the etiology of acne. Although older studies well known by dermatologists that refute the association between acne and diet exist, their scientific foundation is weak. New articles have recently brought to light evidence contrary to previous findings. Therefore, we would like to investigate whether diet, directly or indirectly, influences one or more of the four fundamental etiopathogenic pillars of acne: (1 hyperproliferation of basal keratinocytes, (2 increase of sebaceous production, (3 colonization by Propionibacterium acnes, and (4 inflammation.

  5. Dieta, obesidad y sedentarismo como factores de riesgo del cáncer de mama

    Directory of Open Access Journals (Sweden)

    Carlos Antonio Oliva Anaya

    Full Text Available El cáncer de mama es la primera causa de muerte por tumores malignos entre las mujeres. Una dieta no saludable, el sedentarismo y la obesidad son factores de riesgo importantes para padecer cáncer de mama, sobre todo en mujeres posmenopáusicas. El objetivo del presente trabajo es revisar los estudios epidemiológicos más relevantes sobre dieta, obesidad y cáncer de mama en las mujeres. Se estableció una estrategia de información, educación y comunicación social como apoyo a las acciones del Programa Nacional de Control de Cáncer Mamario. Para la prevención y tratamiento de la obesidad e incidencia de cáncer de mama es necesario actividades de educación nutricional, para producir cambios en los patrones y hábitos alimentarios y por consiguiente de estilos de vida, que promuevan una dieta más variada y el aumento del ejercicio físico, entre otros aspectos.

  6. Efeito da inclusão de nitrato na dieta sobre a fermentação ruminal, a emissão de metano entérico e o desempenho de ovinos

    OpenAIRE

    Hani Mohammed Mohammed El-zaiat

    2013-01-01

    Objetivou-se avaliar os efeitos da inclusão de nitrato encapsulado na dieta sobre a fermentação ruminal, a emissão de metano enterico e o desempenho de ovinos. Foram utilizados 18 cordeiros Santa Inês (peso vivo médio de 27 ± 5,55 kg) designados em blocos casualizados por peso, sendo oferecida uma dieta 40:60 feno/concentrado, como dieta basal e alocados a um dos seguintes tratamentos: dieta controle (dieta basal com 1,50% de uréia), Nitrato (dieta basal com 4,51% nitrato encapsulado) e Nitra...

  7. 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...

  8. 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....

  9. 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...

  10. 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.

  11. La dieta en el tratamiento de la litiasis renal: Bases fisiopatológicas

    Directory of Open Access Journals (Sweden)

    Armando L. Negri

    2013-06-01

    Full Text Available La composición de la orina está influenciada por la dieta y la variación de factores dietarios han sido propuestos para modificar el riesgo de nefrolitiasis recurrente. Los nutrientes que han sido implicados incluyen el calcio, el oxalato, el sodio, las proteínas de origen animal, el magnesio y el potasio. Hay evidencias significativas que demuestran que una dieta alta en calcio se asocia con una reducción del riesgo litogénico. Uno de los posibles mecanismos para explicar esta aparente paradoja, es que la mayor ingesta de calcio se une en el intestino al oxalato dietario, reduciendo la absorción del mismo y su excreción urinaria. El oxalato de la dieta parece aportar solo una pequeña contribución a su excreción y es conveniente una restricción dietética sólo en aquellos con hiperoxaluria e hiperabsorción. Los estudios observacionales han mostrado una asociación positiva e independiente entre el consumo de sodio y la formación de nuevos cálculos renales. El consumo de proteínas de origen animal genera una carga ácida que aumenta la excreción urinaria de calcio y ácido úrico y reduce la de citrato, todos factores que podrían participar en la génesis de la litiasis. Alimentos ricos en potasio aumentan el citrato urinario debido a su contenido de álcalis. En estudios observacionales prospectivos, las dietas ricas en magnesio se asociaron con un menor riesgo de formación de cálculos renales en hombres. En conclusión, la dieta es un elemento central en el control del paciente con cálculos renales, pero siempre subordinada a los factores de riesgo metabólico hallados.

  12. 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.

  13. 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.

  14. 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.

  15. Casca de soja em dietas para ovinos Soybean hulls in sheep diets

    Directory of Open Access Journals (Sweden)

    José Walter dos Santos

    2008-11-01

    Full Text Available Objetivou-se avaliar a utilização de quatro níveis de casca de soja (0; 8,0; 16,0 ou 24,0% em substituição ao fubá de milho (0, 25, 50 e 75% em dietas para ovinos em confinamento. Avaliaram-se o consumo e a digestibilidade dos nutrientes, o desempenho animal, a conversão alimentar e os custos com a dieta. Vinte cordeiros da raça Santa Inês com peso vivo médio inicial de 32,96 kg foram distribuídos em delineamento inteiramente casualizado com quatro tratamentos e cinco repetições. A dieta foi composta de 50% de volumoso (50% de silagem de milho e 50% de cana-de-açúcar picada e 50% de concentrado. Os concentrados foram compostos de fubá de milho, farelo de soja, mistura mineral e uréia, de modo que o fubá de milho foi gradativamente substituído pela casca de soja. Os animais foram mantidos em baias individuais com comedouro e bebedouro. Não foram observados efeitos dos níveis de casca de soja da dieta sobre o consumo de nutrientes, exceto o de FDN, que aumentou linearmente de acordo com o nível de casca de soja na dieta. Os níveis de casca de soja não influenciaram a digestibilidade dos nutrientes, o ganho de peso (0,215 kg/animal/dia e a conversão alimentar dos animais (6,20 kg MS/kg peso ganho. O aumento do nível de casca de soja de 0 e 75% na dieta reduziu os gastos com alimentação e aumentou a margem bruta de R$ 10,89 para R$ 18,63 por animal. A substituição de até 75% do fubá de milho por casca de soja na dieta não afeta o desempenho de ovinos em terminação em confinamento.The objective was to evaluate the use of four levels of soybean hulls (0.0, 8.0, 16.0 and 24.0% to replace the corn meal (0.0, 25, 50 and 75% in the diet of sheep in feedlot. Performance, nutrient digestibilities and feeding costs were evaluated. Twenty Santa Inez breed lambs with 32.96 kg BW were distributed to a completely randomized design with four diets and five replications. The diet was composed of 50% forage (50% of corn silage and

  16. 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...

  17. 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.

  18. 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...

  19. 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.

  20. 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....

  1. 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....

  2. 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.

  3. 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...

  4. 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...

  5. 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

  6. 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

  7. 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...

  8. 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 ...

  9. 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.

  10. 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.

  11. Digestibilidad in situ de dietas con harina de nopal deshidratado conteniendo un preparado de enzimas fibrolíticas exógenas In situ digestibility in dehydrated ground prickly pear diets containing a fybrolitic enzymes product

    Directory of Open Access Journals (Sweden)

    Marco Medina Romo

    2006-07-01

    Full Text Available Se evaluó el efecto de un preparado de enzimas fibrolíticas exógenas (celulasas y xilanasas en la degradabilidad in situ de la materia seca (DisMS, fibra detergente neutro (DFDNr y fibra detergente ácido residual (DFDAr, en dietas altas o bajas en harina de nopal deshidratado. Se aplicaron concentraciones de 0, 1, 2 y 3 g de enzima por kilogramo de materia seca al inicio y 24 horas antes de la degradación in situ. Se determinó la concentración de ácidos grasos volátiles totales y de nitrógeno amoniacal a las 0, 3, 6, 9, 12 y 24 horas después de aplicarse la enzima. No se observaron efectos en DisMS, DFDNr y DFDAr; la aplicación al inicio de la degradación in situ mostró valores más altos que a 24 horas para DisMS y DFDNr, pero fue menor para DFDAr. No se observaron diferencias en las interacciones entre niveles de enzima, tipo de dieta y tiempo de pretratamiento. La aplicación de 1 y 3 g de enzima, en la dieta con bajo contenido de harina de nopal, tuvo efectos en el incremento de los ácidos grasos volátiles totales; para el nitrógeno amoniacal, los mejores resultados ocurrieron con 0 y 1 g de enzima.It was evaluated the effect of a fybrolitic enzyme product (cellulases and xylanases on in situ digestibility of dry matter (DisMS, residual neutral detergent fiber (DFDNr and acid detergent fiber (DFDAr, in dehydrated ground prickly pear diets with a low or high level. Enzyme concentrations of 0, 1, 2, and 3 g kg-1 of dry matter applied at the beginning (0 hour and 24 hours before starting in situ digestibility were used. Total volatile fatty acids and ammonia nitrogen were determined at: 0, 3, 6, 9, 12, and 24 hours after the enzyme application. There were no effects on DisMS, DFDNr, and DFDAr. Initial application of enzyme concentrations (0 hour was higher than 24 hours for DisMS and DFDNr but lower for DFDAr. No differences were observed in interactions among enzyme level, diet and application time. Application of 1 and 3 g of

  12. 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 ...

  13. Dynamics of an ant-plant-pollinator model

    Science.gov (United States)

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

    2015-03-01

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

  14. 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

  15. 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...

  16. 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.

  17. Acumulación/eliminación de oxitetraciclina en el camarón blanco, lv y su residualidad en dietas artificiales

    OpenAIRE

    Montoya, Nelson; Reyes, Eduardo

    2002-01-01

    Acumulación/eliminación de oxitetraciclina en el camarón blanco, LV y su residualidad en dietas artificiales Acumulación/eliminación de oxitetraciclina en el camarón blanco, LV y su residualidad en dietas artificiales

  18. Ensayo de diferentes lecitinas en la dieta de juveniles de Penaeus vannamei (Crustacea: Decapoda

    Directory of Open Access Journals (Sweden)

    Ana Denisse Re-Araujo

    2003-09-01

    Full Text Available Para comparar diferentes niveles y calidades de lecitina se hizo un bioensayo nutricional con dietas isoenergéticas; para medir el crecimiento, la tasa de conversión alimenticia y sobrevivencia de juveniles de P. vannamei (290 mg ± 0.02. Las lecitinas experimentales fueron de calamar, lecitina liquida de soya (7%, lecitina desaceitada de soya (3.48% en combinación con aceite de pescado o lípidos neutros de calamar, en una formula parcialmente desaceitada. Las cinco dietas fueron administradas ad libitum con cuatro replicas (estanques de 15 camarones cada uno (5 x 4 x 15, durante 28 días. La mayor ganancia en peso fue (191% y FCR (1.69±0.041 fueron obtenidos con la dieta que contenía 7% de lecitina cruda de soya como única fuente de lípidos, seguida por la dieta que contenía 3.94% de lecitina desaceitada y 2.24% de aceite Menhaiden (172% y 2.03±0.054 respectivamente. Como se esperaba los resultados menos propicios fueron con la dieta que no contenía lecitina (121% y 2.42±0.129. La lecitina cruda de soya, cubrió los requerimientos de fosfolípidos y de lípidos neutrales, tanto como la dieta con lecitina desaceitada de soya con aceite de pescado o aceite de calamarThe effect of different lecithin sources and presentations on growth, food conversion ratio and survival of P. vannamei (290 mg ± 0.02 was studied. The bioassay was designed in order to compare different dietary levels and different quality of lecithin. Squid lecithin, crude soybean (7%, deoiled soybean lecithin (3.48% in combination with fish oil or squid neutral lipids, in a partially dilapidate formula. The isoenergetic diets were fed ad libitum to four replicate groups (tanks of 15 shrimps each (5 x 4 x 15, during 28 days. The result of the bioassay with the partially dilapidate formulas was; the best growth rate (191% and FCR (1.69±0.041 were obtained with the diet containing 7% of soybean crude lecithin as the unique lipid source. Followed by the diet countering 3

  19. 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

  20. 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.

  1. Desempenho e qualidade da carne de bovinos cruzados alimentados com diferentes dietas em confinamento

    OpenAIRE

    Silva, Maria Lígia Pacheco da [UNESP

    2016-01-01

    Com a alta demanda mundial de carne de qualidade, a utilização de cruzamento entre raças e de dieta com teores elevados de energia são estratégias que podem ser utilizadas visando à melhorias na eficiência do sistema de produção de carne bovina e na qualidade do produto final. Assim, o objetivo neste trabalho foi avaliar o desempenho (pesos, ganhos em peso, consumo de matéria seca, eficiência alimentar e dias em confinamento), características de carcaça (peso e rendimento de carcaça fri...

  2. Vegetarianismo e comportamento alimentar : comportamentos alimentares disfuncionais e hábitos alimentares em dietas vegetarianas

    OpenAIRE

    Rola, Catarina, 1988-

    2016-01-01

    Tese de mestrado, Doenças Metabólicas e Comportamento Alimentar, Universidade de Lisboa, Faculdade de Medicina, 2016 As escolhas alimentares exercem uma influência significativa na génese, manutenção e agravamento do quadro clínico do paciente. Quando corretamente planeadas, as dietas apoiadas no vegetarianismo são nutricionalmente equilibradas. Contudo, dada a legitimidade da restrição alimentar que lhe é característica, a comunidade científica levanta a hipótese de esta mascarar comporta...

  3. Qualidade da dieta e estilo de vida de adolescentes de uma escola particular de Pelotas, RS

    OpenAIRE

    Maciel, Francine Villela

    2013-01-01

    Mudanças no comportamento adotado durante a adolescência têm sido observadas nos últimos anos. Tais mudanças favoreceram o desenvolvimento de práticas alimentares inadequadas e geraram alterações no estado nutricional, caracterizadas pelo aumento excessivo de peso. Com isso, este trabalho teve por objetivo avaliar a qualidade da dieta e fatores relacionados ao estilo de vida de adolescentes de uma escola particular de Pelotas, RS. Foi realizado um estudo transversal descritivo, com 525 adoles...

  4. ¿Podemos mejorar la dieta triturada en personas de la tercera edad?

    OpenAIRE

    Gutiérrez Yáñez, María del Mar

    2015-01-01

    El problema de la disfagia afecta en la actualidad a un gran número de personas. Este trabajo se centra en el colectivo de la tercera edad. El envejecimiento por sí mismo no causa disfagia, pero sí cambios asociados al mismo, que además influyen negativamente en el estado nutricional de este colectivo. La dieta y el estado nutricional en términos generales son de gran influencia en la prevención y tratamiento de muchas enfermedades, especialmente en este grupo de población más vulnerable....

  5. Experiencia con la dieta cetogénica como tratamiento en la epilepsia refractaria

    OpenAIRE

    Ramírez Camacho, Alia; Meavilla, Silvia; Catalán, Natalia; Gutiérrez, Alejandra; Campistol Plana, Jaume

    2011-01-01

    Introducción: La epilepsia es una enfermedad neurológica que se controla con fármacos antiepilépticos en la mayoría de casos. Sin embargo, aproximadamente un 25% de epilepsias son refractarias al tratamiento farmacológico. La dieta cetogénica es una de las opciones terapéuticas para este tipo de epilepsia. A pesar del aumento en los últimos años de la popularidad de ésta como tratamiento anticonvulsivo, no se ha establecido un consenso internacional para sus indicaciones y manejo. Objetivo: E...

  6. Evaluación nutricional de harina de nopal en dietas para borregos.

    OpenAIRE

    Muciño Castillo, Gabriela

    2014-01-01

    La deshidratación del nopal es un método de conservación para alargar su vida útil y para mejorar su utilización como forraje en la alimentación de borregos. Los objetivos de este estudio fueron evaluar: 1) el contenido nutrimental, la degradación de la MS y la producción de gas in vitro de harinas de Opuntia robusta, Opuntia ficus indica var Copena F1, Opuntia albicarpa var Blanca San Martín, Opuntia megacantha var Roja San Martín y Opuntia ficus indica var Atlixco, y de dietas totalmente me...

  7. 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.

  8. 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).

  9. 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.

  10. 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.

  11. 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...

  12. 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.

  13. 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.

  14. Efeito da suplementação com pupunha como fonte de vitamina A em dieta: estudo em ratos

    Directory of Open Access Journals (Sweden)

    Lucia K.O. Yuyama

    1996-02-01

    Full Text Available Foi estudado o efeito da suplementação com pupunha (Bactris gasipaes H.B.K., polpa cozida e transformada em farinha, como fonte de vitamina A, em dieta regional de Manaus, AM,Brasil, por meio do ensaio biológico com ratos. A metodologia utilizada foi da depleção dos animais em zinco e vitamina A, seguida da repleção com a dieta regional (DR, DR + pupunha, DR + vitamina A e dieta controle (DC. A dieta foi elaborada para famílias com rendimentos inferiores a dois salários-mínimos. Foram utilizadas ratas albinas adultas pós-parto, cada qual com 6 filhotes machos, que receberam ração à base de caseína lavada com EDTA a 1%, sem adição de Zn e vitamina A, por 25 dias, com a finalidade de obtenção de animais recém-desmamados deficientes nestes dois nutrientes. O período de repleção dos animais, recém-desmamados, foi de 30 dias e o delineamento foi inteiramente casualizado com 4 tratamentos de 8 animais cada. A suplementação efetuada seguiu as recomendações do "Committee on Laboratory Animal Diets". Os parâmetros empregados para a avaliação da utilização de vitamina A foram as concentrações de vitamina A no fígado e plasma e o crescimento dos animais. Ao final do experimento, observou-se que os animais que consumiram a ração à base da dieta regional de Manaus, suplementada com pupunha e vitamina A, apresentaram, respectivamente, concentração significativamente maior de vitamina A no fígado, 43,3 ± 6,5 µg/g e 42,0 ± 4,3 µg/g em relação à dieta regional, 5,5 ± 1,1 µg/g (p<0,05. A quantidade de zinco presente na dieta regional de Manaus, 10,7 mg diários, foi biodisponível quando avaliada pela concentração de zinco nos fêmures. Os resultados sugerem que existe necessidade de suplementação da dieta regional de Manaus com vitamina A para a manutenção das reservas hepáticas, podendo, para tanto, ser utilizada a fonte natural da pupunha.

  15. Las dietas cetogénicas: fundamentos y eficacia para la pérdida de peso

    OpenAIRE

    Pérez-Guisado, Joaquín

    2008-01-01

    El consenso internacional es que los carbohidratos son la base de la pirámide alimenticia de una dieta saludable, de tal forma que la mayoría de los especialistas de hoy en día piensan que la mejor forma de perder peso es mediante una reducción en el número total de calorías ingeridas diariamente, principalmente las que vienen en forma de grasa. No obstante, esta revisión intentará demostrar que las dietas cetogénicas son desde un punto de vista fisiológico, bioquímico y ...

  16. Modulación de la respuesta alérgica por los carotenoides de la dieta

    Directory of Open Access Journals (Sweden)

    Andrés Ernesto Merlano-Barón

    2016-01-01

    Evidencia epidemiológica y básica experimental emergente señala que los carotenoides de la dieta participan en la regulación de la inflamación alérgica, y por ello se postulan como coadyuvantes en la terapia de tales padecimientos. En el presente artículo se revisará el estado del arte en relación a los efectos de los carotenoides de la dieta sobre la patología alérgica.

  17. Dieta de Tropidurus Itambere Rodrigues (Sauria ; Iguanidae) na Fazenda Manga, Municipio de Valinhos, São Paulo

    OpenAIRE

    Monique Van Sluys

    1991-01-01

    Resumo: Foi estudada a dieta de Tropidurus itambere, na Fazenda Manga, Valinhos, São Paulo. Os animais foram coletados mensalmente com laço, mortos e fixados no campo. No laboratório processou-se a triagem do conteúdo estomacal, sob lupa. Também foram coletados artrópodos no ambiente para estimativa da disponibilidade relativa de presas. A dieta de T. itambere é onívora, sendo constituída basicamente por formigas (98,3% dos estômagos analisados). Outras presas bastante freqüentes são aranhas,...

  18. Las dietas cetogénicas: beneficios adicionales a la pérdida de peso y efectos secundarios infundados

    OpenAIRE

    Pérez-Guisado, Joaquín

    2008-01-01

    Además de la pérdida de peso, también es importante enfatizar que las dietas cetogénicas son saludables cardiovascularmente y para el metabolismo glucídico, ya que promueven un perfil lipídico no aterogénico, el descenso de la presión arterial y disminuyen la resistencia a la insulina con una mejora en los niveles plasmáticos de glucosa e insulina. Estas dietas podrían tener efectos anticancerígenos, no tienen efectos perniciosos sobre el hígado o el riñón, no se asocian ...

  19. Dietas Cetogénicas en el siglo XXI: ¿ Una alternativa terapéutica de la obesidad?

    OpenAIRE

    Sánchez Almeida, Marta

    2015-01-01

    En el último siglo la obesidad y el sobrepeso se han convertido en una epidemia a nivel mundial según la OMS. Estas dos enfermedades acarrean otra serie de patologías como el síndrome metabólico y enfermedades cardiovasculares. Es necesario, llevar a cabo un seguimiento continuo y hacer una educación para la salud adecuada que conlleve la modificación del estilo de vida (dieta, ejercicio) para poder prevenir este problema. En la última década, se han difundido las dietas proteinadas par...

  20. Estudio descriptivo de las principales dietas proteinadas que existen en la actualidad para el tratamiento de la obesidad

    OpenAIRE

    Franguillo Fernández, Raquel

    2014-01-01

    El propósito de este trabajo es conocer algunas de las distintas dietas proteinadas que se están utilizando en la actualidad como tratamiento en la obesidad. El problema de la obesidad, como indican los últimos cálculos de la Organización Mundial de la Salud (OMS) realizados en 2010 (1), estima que esta enfermedad ha alcanzado proporciones epidémicas a nivel mundial y de seguir en esta línea en 2040 la totalidad de la población europea tendrá sobrepeso (2). Las dietas proteinadas son un...

  1. Dieta cetogénica. A experiência de um Serviço de Pediatria

    OpenAIRE

    Marçal, Mónica; Deuchande, Sofia; Lima, Sofia; Vale, Gorete; Alves, Eduarda; Carlos Ferreira, José; Cabral, Pedro; Carlos Guimarães, José

    2014-01-01

    Introdução: A dieta cetogénica consiste num regime alimentar normoproteíco, rico em lípidos e pobre em hidratos de carbono, que mimetiza a resposta do organismo ao jejum prolongado. Tem sido utilizada no tratamento de crianças com epilepsia refractária.Metodologia: Análise retrospectiva de 27 crianças com epilepsia refractária, acompanhadas em Consulta de Neurologia Pediátrica de um Hospital de nível III e submetidas a dieta cetogénica. Caracterização da amostra no que diz respeito à distribu...

  2. 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....

  3. 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.

  4. 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

  5. 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...

  6. 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

  7. 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.

  8. 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.

  9. 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.

  10. Vitamina A em dieta de juvenis de pacu cultivados em tanques-rede

    Directory of Open Access Journals (Sweden)

    Arcangelo Augusto Signor

    2013-08-01

    Full Text Available O objetivo deste trabalho foi avaliar o efeito da suplementação de vitamina A na alimentação de juvenis de pacu cultivados em tanques-rede. Foram utilizados 2.000 peixes, com peso inicial médio de 66,93±15,03 g, distribuídos em delineamento inteiramente casualizado, em 20 tanques-rede de 5,0 m³, com cinco tratamentos e quatro repetições. As rações foram formuladas com 0, 3.000, 6.000, 9.000 e 12.000 UI de vitamina A por quilograma de dieta, por meio da suplementação com acetato de retinol. O arraçoamento foi realizado às 8:30, 13:30 e 17:30 h, até a saciedade aparente dos animais. Não foram observadas diferenças quanto aos parâmetros de desempenho produtivo, rendimento e composição química da carcaça, e aos parâmetros hematológicos e lipídios no fígado dos peixes que foram alimentados com diferentes níveis de vitamina A. A suplementação de vitamina A em dietas para juvenis de pacu criados em tanques-rede não influencia o desempenho produtivo dos peixes.

  11. 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.

  12. 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.

  13. 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

  14. 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.

  15. 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.

  16. Distribución y comentarios sobre la dieta de Rhinella azarai (Anura, Bufonidae en Corrientes, Argentina

    Directory of Open Access Journals (Sweden)

    Etchepare, Eduardo G.

    2012-03-01

    Full Text Available En esta contribución se dan a conocer nuevas poblaciones de R. azarai para la provincia de Corrientes (Argentina, y se brinda información sobre la composición de la dieta de una de ellas.

  17. ACEPTACIÓN DE UNA DIETA ARTIFICIAL POR LARVAS DE LA MARIPOSA BATTUS POLYDAMAS POLYDAMAS (LEPIDOPTERA: PAPILIONIDAE

    Directory of Open Access Journals (Sweden)

    Ricardo Augusto Claro Carrascal

    2010-01-01

    Full Text Available Se evalúo la aceptabilidad de una dieta artificial utilizada en la alimentación del estado larval de la mariposa Battus polydamas polydamas (Lepidoptera: Papilionidae, bajo condiciones de laboratorio.  A las larvas se les ofreció una dieta en diferentes presentaciones y composiciones, de acuerdo con ensayos previos y con los análisis nutricionales desarrollados a larvas maduras y a hojas de la  planta hospedera, Aristolochia maxima (Aristolochiaceae.  La longevidad, en estado larval, de B. polydamas criadas en laboratorio, se ve afectada significativamente por los diferentes tratamientos de alimentación. La curva de sobrevivencia no presento diferencias significativas entre las larvas alimentadas con solamente hojas jóvenes de la planta y aquellas que se alimentaron con dieta esparcida. En contraste, las tasas de crecimiento larval, fueron significativamente afectadas según el tratamiento.  Se sustenta la cría de mariposas de la especie B. polydamas bajo una dieta artificial con condiciones de temperatura, humedad y luminosidad controlada, con propósitos de investigación o futuros planes de manejo y conservación.

  18. Desempenho de vacas em lactação alimentadas com dietas contendo torta de macaúba

    Directory of Open Access Journals (Sweden)

    R.A. Azevedo

    2014-02-01

    Full Text Available Avaliaram-se o consumo de nutrientes e a produção e composição do leite de vacas da raça Holandesa alimentadas com dietas contendo diferentes quantidades de inclusão de torta de macaúba. Oito animais foram distribuídos em dois quadrados latinos 4x4, sendo quatro tratamentos, 0, 100, 200 e 300g kg-1 de TM na matéria seca da dieta, e quatro períodos experimentais de 21 dias, 14 de adaptação e sete de avaliações. A adição de quantidades crescentes de torta de macaúba à dieta alterou o consumo de matéria seca, matéria orgânica, proteína bruta, extrato etéreo, fibra em detergente neutro, carboidratos não fibrosos, produção e os teores de lactose, extrato seco desengordurado e sólidos totais do leite, bem como a eficiência alimentar e a digestibilidade da matéria seca. Por outro lado, não foi verificada diferença nos teores de gordura do leite. A adição da TM em até 300g kg-1 da dieta comprometeu o consumo e o desempenho produtivo dos animais.

  19. 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.

  20. Proteínas da soja processadas de diferentes modos em dietas para desmame de leitões

    Directory of Open Access Journals (Sweden)

    Bertol Teresinha Marisa

    2001-01-01

    Full Text Available Foi realizado um experimento para avaliar a substituição parcial do farelo de soja (FS por outros subprodutos da soja obtidos por intermédio de diferentes tipos de processamento, bem como comparar estes subprodutos entre si, como fonte protéica na dieta de leitões desmamados aos 21 dias de idade. Com este objetivo foram comparados quatro tratamentos: T1 - dieta controle, com FS como única fonte protéica; T2, T3 e T4 -- 50% do FS da dieta controle foi substituído por soja integral extrusada (SIE, proteína texturizada de soja (PTS e proteína concentrada de soja (PCS, respectivamente. As dietas foram isocalóricas, isolisínicas, contendo o mesmo nível de produtos lácteos e fornecidas do dia do desmame até 14 dias após. A substituição parcial do FS por qualquer um dos subprodutos avaliados melhorou o ganho de peso diário (GPD, o consumo diário de ração (CRD e a conversão alimentar (CA no período de fornecimento das dietas. No período total da creche, a substituição parcial do FS proporcionou melhoria no GPD e CRD, mas a CA não foi afetada. A incidência de diarréia e a morfologia da mucosa intestinal não foram influenciadas pelos diferentes subprodutos da soja. A substituição de 50% do FS da dieta de desmame pela SIE, PTS ou PCS proporcionou melhor desempenho, com ganhos adicionais de 1 a 2 kg a mais por leitão no final da fase de creche. A SIE, PTS e PCS não apresentam diferenças entre si como substitutos parciais do FS na dieta de leitões desmamados com 21 dias de idade.

  1. Estudos para Composição de uma Dieta Referência Semipurificada para Avaliação de Exigências Nutricionais em Juvenis de Pirapitinga, Piaractus brachypomus (Cuvier, 1818

    Directory of Open Access Journals (Sweden)

    Vásquez-Torres Wálter

    2002-01-01

    Full Text Available Foram realizados dois experimentos com o objetivo de definir uma dieta referência para estudos de exigências nutricionais em Piaractus brachypomus. No primeiro experimento, foram testadas quatro dietas com ingredientes semipurificados (H-440 com 47% PB, C-102 com 41% PB, NRC com 37% PB e IALL-1 com 32% de PB e uma dieta controle (32% de PB com ingredientes comuns. No segundo experimento, foi usada a dieta IALL-1, como base para a formulação de três dietas experimentais. A dieta 2 foi suplementada com vitamina C e uma pré-mistura de macrominerais, enquanto na dieta 3 o óleo vegetal foi substituído por óleo de peixe. O ganho de peso foi usado como critério básico para medir os efeitos das dietas, sendo também considerados consumo de alimento, taxa específica de crescimento (SGR, conversão alimentar aparente (FCR, eficiência de utilização da proteína (PER e retenção de proteína (%PPV e de energia (%RE. Entre as dietas semipurificadas, o melhor desempenho de crescimento e de utilização dos nutrientes foi observado para as dietas NRC e IALL-1, que não diferiram entre si. No segundo experimento, o grupo de peixes alimentados com a dieta 2 apresentou crescimento 42% maior que o observado com as dietas sem suplementação. As outras variáveis analisadas, FCR, SGR, PER e %PPV, também foram significativamente melhoradas. Os resultados em conjunto indicam que a dieta IALL-1 suplementada com macrominerais e vitamina C pode ser considerada adequada como dieta referência semipurificada para estudos de nutrição de Piaractus brachypomus.

  2. 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.

  3. 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.

  4. 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.

  5. 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.

  6. 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.

  7. 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.

  8. Estudo sobre a ocorrência de fungos e aflatoxina B1 na dieta de bovinos leiteiros em São Paulo

    OpenAIRE

    Motta, Thiago P.; Frizzarin, Adriana; Martins, Thamires; Miranda, Mariana S.; Arcaro, Juliana R.P.; Ambrósio, Luiz A.; Pozzi, Claudia R.

    2015-01-01

    A qualidade da dieta ofertada às vacas em lactação é uma preocupação dos agentes de saúde devido à possibilidade da detecção de micotoxinas prejudiciais a saúde humana e animal. Os objetivos do trabalho foram avaliar o perfil da micobiota, determinar a atividade de água (Aa) e a ocorrência natural de aflatoxina B1 (AFB1) em dietas ofertadas a vacas em lactação de fazendas leiteiras no estado de São Paulo, Brasil. As amostragens das dietas foram realizadas diretamente dos cochos de lote de 15 ...

  9. Dieta cetogênica para epilepsia intratável em crianças e adolescentes: relato de seis casos

    OpenAIRE

    Vasconcelos,Marcio M.; Azevedo,Patricia M. Couto; Esteves,Lívia; Brito,Adriana R.; Olivaes,Maria Cecílea D. de; Herdy,Gesmar V. Haddad

    2004-01-01

    OBJETIVO: Descrever a introdução e o manejo da dieta cetogênica em um grupo de seis crianças e adolescentes com epilepsia refratária. MÉTODOS: Os autores reviram o prontuário médico de cada paciente menor de 15 anos submetido à dieta cetogênica entre abril de 1999 e julho de 2003 e compararam os resultados terapêuticos e efeitos adversos e benéficos com a literatura pertinente. RESULTADOS: A dieta cetogênica foi introduzida para seis pacientes, com idade mediana de sete anos (faixa: 1,8-12,2)...

  10. Ratos tratados com dieta cetogênica apresentam aumento de tecido adiposo mediado pela elevação da atividade da fosfoenolpiruvato carboxicinase

    OpenAIRE

    Leticia Carina Ribeiro

    2005-01-01

    A Dieta Cetogênica é caracterizada pelo alto teor de gordura e baixo teor de carboidratos e proteínas, e tem sido proposta como benéfica em crianças com desordens epiléticas que não respondem ao tratamento convencional de drogas anti-epiléticas. O retardo de crescimento é um importante inconveniente desta dieta e as causas metabólicas ainda não estão bem caracterizadas. O objetivo desse estudo é examinar a variação de peso corporal e de tecido adiposo de ratos Wistar tratados com a dieta ceto...

  11. Fitasa y enzimas fibrolíticas en dietas para cerdos con diferentes sustratos

    Directory of Open Access Journals (Sweden)

    Mario Alberto Ávalos Castro

    2011-01-01

    Full Text Available El objetivo del estudio fue evaluar la adición de fitasa (F y actividades de pectinasa, glucanasa y hemicelulasa (PGH en dietas sorgo-soya-canola, y xilanasa (X en dietas con grano seco de destilería con solubles (GSDS sobre la digestibilidad ileal y fecal de nutrientes (Exp 1 y el comportamiento productivo (Exp 2 en cerdos en crecimiento finalización. En el Exp 1 se formularon dos dietas basales (B1, sorgo-soya-canola y B2, sorgo-soya-canola + GSDS y los tratamientos fueron, 1 B1+F, 2 B1+F+PGH, 3 B2+F, 4 B2+F+PGH, 5 B2+F+X, y 6 B2+F+PGH+X. El Exp 2 incluyó cuatro tratamientos, 1 Testigo positivo (sorgosoya- canola con energía normal, 2 Igual que 1, pero bajo en energía, 3 Igual que 2 +F+PGH, 4 Igual que 3 +GSDS +X. En el Exp 1, la digestibilidad de la energía a nivel ileal se mejoró (P<0.05 con +F+PGH, +F+X y +F+PGH+X, y a nivel fecal se mejoró (P<0.05 con +F+X. La PGH liberó 122 kcal a nivel ileal y la X liberó 147 y 132 kcal de ED/kg de alimento a nivel ileal y fecal. En el Exp 2, la eficiencia alimenticia fue mayor (P<0.01 en el testigo positivo y el tratamiento bajo en energía +F+PGH, pero este último tuvo mayor (P<0.05 eficiencia energética. El valor energético de los GSDS se mejoró por la adición de F, PGH y X, pero la respuesta en crecimiento observada en el presente trabajo no fue consistente.

  12. 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.

  13. 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

  14. 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.

  15. 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...

  16. 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.

  17. 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.

  18. 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

  19. [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.

  20. 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...

  1. 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)

  2. 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.

  3. 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)

  4. 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

  5. Teores de poliaminas em alguns alimentos da dieta básica do povo brasileiro

    Directory of Open Access Journals (Sweden)

    Lima Giuseppina Pace Pereira

    2006-01-01

    Full Text Available Os teores de poliaminas variam, assim como a sua necessidade, por estarem relacionadas diretamente com o crescimento de células. Neste estudo, foram analisados os teores de putrescina, espermidina e espermina em diversos alimentos de origem vegetal e em ovos. O cozimento não afetou os teores em arroz ou feijão, porém em batata inglesa houve diferença, sendo que a fritura incrementou o teor principalmente de putrescina. Alface, laranja, banana e tomate apresentaram teores de putrescina maiores, enquanto que em cebola, alho, ovos, arroz e feijão houve predominância de espermidina e espermina. Estes resultados são relevantes para uma possível elaboração da dieta de muitas pessoas, dependendo da sua necessidade diária.

  6. Farelo de arroz em dietas para ovinos Rice meal in sheep diet

    Directory of Open Access Journals (Sweden)

    Alexandre Lima de Souza

    2010-03-01

    Full Text Available Avaliou-se o consumo e a digestibilidade aparente dos nutrientes em ovinos submetidos a dietas com diferentes níveis de farelo de arroz (0, 7, 14 e 21%, em substituição ao milho na ração concentrada. Foram utilizados 20 ovinos da raça Santa Inês, machos não-castrados, com peso vivo médio inicial de 23,00 ± 1,6kg, em delineamento inteiramente casualizado com quatro tratamentos e cinco repetições. Os animais foram mantidos em gaiolas metabólicas, por um período de 21 dias, de forma que 14 dias foram destinados à adaptação e sete para coletas de sobras e amostras fecais. As dietas eram isoproteicas com 13,3% de proteína bruta, compostas por 50% de concentrado e 50% de volumoso (50% de cana-de-açúcar in natura + 50% de silagem de milho com base na matéria seca, e fornecidas ad libitum permitindo sobras de 10%. O consumo de matéria seca foi obtido pela diferença entre a dieta e as sobras, e, assim como os nutrientes digestíveis totais, foi reduzido em 8,7 e 3,4g/dia por unidade percentual de farelo de arroz adicionado à dieta. Não foi observado efeito do farelo de arroz sobre a digestibilidade dos nutrientes, e os valores médios foram de 71,57; 73,26 e 47,00%, respectivamente, para o DMS, DCT e DFDN.The intake and nutrients digestibility of the diets content different levels of rice meal (0, 7, 14 and 21% in substitution to corn in concentrate ration were evaluated for sheep. Twenty sheep, not castrated, Santa Inês breed, with initial average body weight of 23±1,6kg were used, on the completely randomized design with four treatments and five repetitions. The animals were kept in individual metabolic cages, for a period of 21 days, have been the initial 14 days used to animal adaptation and seven days for orts and fecal samples collections. The diets were isonitrogenous with 13.3% of crude protein, haved roughage:concentrate ration of 50:50, based on dry matter provided ad libitum, allowing orts of 10%. The dry matter

  7. Rastreabilidade de subprodutos de origem animal em dietas com levedura e trigo para frangos

    OpenAIRE

    Gottmann,Rosana; Pezzato,Antonio Celso; Ducatti,Carlos; Denadai,Juliana Célia; Móri,Cleusa; Mituo,Mariela Akie Okino; Sartori,José Roberto

    2008-01-01

    O objetivo deste trabalho foi rastrear a inclussão de farinhas de origem animal em rações para frango de corte com ou sem levedura de cana-de-açúcar e farelo de trigo, por meio da análise do músculo peitoral das aves pelas técnicas dos isótopos estáveis de carbono e nitrogênio. Foram utilizados 210 pintos machos (Cobb), com um dia de idade, distribuídos aleatoriamente em sete tratamentos de 30 aves cada, tendo sido um tratamento controle (dieta vegetal) e seis com inclusão de farinha de carne...

  8. Efeito de dietas semi-simplificadas formuladas com subprodutos de mandioca ensilados ou não sobre o desempenho e características de carcaça de coelhos = Effect of half-simplified diets formulated with cassava by-product ensiled or not on performance and carcass characteristics of rabbits

    Directory of Open Access Journals (Sweden)

    Andréia Fróes Galuci Oliveira

    2011-01-01

    Full Text Available Foram avaliados o desempenho da desmama ao abate e as características de carcaça de 144 coelhos da raça Nova Zelândia Branco, oriundos de matrizes alimentadas com dietas referência ou semi-simplificada com 79,83% de subprodutos de mandioca, distribuídos em gaiolas, em esquema fatorial 2 x 3 (duas rações fornecidas às matrizes e láparos até a desmama versus três rações fornecidas aos animais da desmama até o abate com 12 repetições e dois animais por unidade experimental. As dietas fornecidas, após a desmama, consistiram de umareferência e duas semi-simplificadas com 81,63% de subprodutos de mandioca ensilados ou não antes da sua incorporação. Coelhos cujas mães foram alimentadas com dieta semi-simplificadas se apresentaram mais leves à desmama que os desmamados com dieta-referência. Observou-se menor consumo de ração para os coelhos que receberam a dieta maternidade semi-simplificada até a desmama, resultando em melhor conversão alimentar. Os pesos da carcaça e dos cortes comerciais foram maiores nos animais alimentados com as rações referência maternidade e referência crescimento. O uso de dietas semi-simplificadas com subprodutos de mandioca ensilados ou não, da desmama ao abate, reduziu o ganho de peso diário e o consumo de ração,porém melhorou a conversão alimentar e diminuiu o custo de ração. A utilização das rações semi-simplificadas apresenta-se como alternativa interessante para a produção de coelhos.This study evaluated the performance from weaning to slaughter and carcass characteristics of 144 New Zealand White rabbits, from does fed with a reference diet or half-simplified diet containing 79.83% cassava by-product, allocated in iron cages, in a 2 x 3 factorialarrangement (two diets used for does and litters until weaning versus three diets supplied for animals from weaning to slaughter with 12 replications and two animals per experimental unit. The supplied diets after weaning consisted

  9. 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

  10. 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.

  11. 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.

  12. Glicerina bruta na dieta de bovinos de corte confinados: efeito sobre o hemograma

    Directory of Open Access Journals (Sweden)

    David Attuy Vey da Silva

    2012-06-01

    Full Text Available Objetivou-se com este estudo avaliar o hemograma de bovinos alimentados com glicerina bruta. Trinta novilhos da raça Nelore foram utilizados para as colheitas de sangue, as quais foram realizadas a cada 28 dias. Os animais foram mantidos confinados durante 103 dias e foram alimentados com cinco dietas contendo 0, 7,5, 15, 22,5 e 30% de glicerina bruta com base na matéria seca, formuladas na proporção volumoso:concentrado de 30:70 sendo a silagem de milho o volumoso e o concentrado composto por milho em grão, casca de soja, farelo de girassol, glicerina, calcário calcítico, fostatobicálcico e sal comum. O delineamento utilizado foi em blocos casualisados com cinco tratamentos. Contrastes ortogonais foram usados para determinar os efeitos linear, quadrático, cúbico e tratamento com glicerina × controle. Não houve efeito dos tratamentos (P>0,05 sobre as concentrações sanguíneas de hemácias, hematócrito, basófilos, eosinófilos, neutrófilos bastonetes e linfócitos, porém houve efeito linear sobre as concentrações de plaquetas, hemoglobina e monócitos (P=0,009, P=0,001 e P=0,043, respectivamente, e efeito cúbico sobre as concentrações de leucócitos totais e neutrófilos segmentados (P=0,008 e P=0,004, respectivamente. Dietas para bovinos de corte, contendo relação volumoso:concentrado 30:70 aditivadas com glicerina bruta, promovem alterações no eritrograma e no leucograma destes animais.

  13. 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

  14. 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)

  15. 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.

  16. 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.

  17. 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.

  18. 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

  19. A variedade da dieta é fator protetor para a pressão arterial sistólica elevada

    Directory of Open Access Journals (Sweden)

    Erick Prado de Oliveira

    2012-04-01

    Full Text Available FUNDAMENTO: A dieta influencia diretamente a hipertensão arterial (HAS, que é um dos principais fatores de risco da doença cardiovascular. OBJETIVO: Associar a HAS com fatores dietéticos de adultos clinicamente selecionados para programa de mudança de estilo de vida. MÉTODOS: Estudo transversal composto por 335 indivíduos, com idade entre 44 e 65 anos, clinicamente selecionados para um programa de mudança de estilo de vida. Foram avaliados os dados antropométricos (IMC, % de gordura e circunferência abdominal, os componentes bioquímicos (concentrações plasmáticas de glicose, triglicerídeos, colesterol total, HDL-c e LDL-c e a dieta, por meio do recordatório de 24 horas. A qualidade da dieta foi avaliada pelo Índice de Alimentação Saudável. A pressão arterial foi mensurada de acordo com a V Diretriz Brasileira de Hipertensão Arterial e classificada de acordo com o NCEP-ATPIII. A regressão logística foi realizada para determinar a probabilidade de alterações na PAS e PAD de acordo com a ingestão dietética. Adotou-se como significante o valor de p < 0,05. RESULTADOS: Observou-se correlação positiva da pressão arterial diastólica com o consumo de colesterol e açúcar; e negativa com a ingestão de fibras, porções de óleo e qualidade da dieta. A variedade da dieta ≥ 8 itens alimentares apresentou efeito protetor para alterações da pressão arterial sistólica; OR = 0,361 (0,148-0,878. CONCLUSÃO: A maior variedade da dieta ofereceu efeito protetor para alteração da pressão arterial sistólica.

  20. 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.

  1. 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.

  2. 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 ...

  3. 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 ...

  4. 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 ...

  5. 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

  6. 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

  7. 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.

  8. 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)

  9. 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...

  10. 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.

  11. 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

  12. 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.

  13. 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...

  14. 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

  15. 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...

  16. 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....

  17. 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

  18. 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.

  19. Dieta del Cernícalo Americano (Falco sparverius Linnaeus, 1758 en dos hábitats interandinos del norte de Ecuador

    Directory of Open Access Journals (Sweden)

    Glenda M. Pozo-Zamora

    2017-07-01

    Full Text Available El cernícalo americano es una especie de ave rapaz ampliamente distribuida desde Alaska hasta Tierra de Fuego en Argentina. Su dieta generalista está basada principalmente en invertebrados. En Ecuador existe escasa información biológica de ésta especie, desconociéndose aspectos de alimentación. En el presente trabajo se da a conocer la dieta del cernícalo americano, por medio del análisis de egagrópilas colectadas en dos hábitats ubicados en la región interandina en el norte de Ecuador. Los ítems más representativos para Sangolquí y Tababela fueron los coleópteros (48.4 y 39.5%, seguidos por orthópteros (31.3 y 30.7 % respectivamente. En términos de biomasa, los mamíferos son los más importantes dentro de la dieta del cernícalo americano con el 40.3% para Sangolquí y el 70.8% en Tababela. El índice de Shannon (H´= 1.894 indica una mediana diversidad de presas, y la amplitud de dieta (0.26 indica que ésta especie presenta una dieta especialista, difiriendo de otros hábitats donde presenta dieta generalista.

  20. 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

  1. 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.

  2. 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...

  3. Ex-ante Evaluation von Investitionsalternativen

    Directory of Open Access Journals (Sweden)

    Matthias Müller

    2017-12-01

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

  4. 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...

  5. 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...

  6. Las dietas cetogénicas: fundamentos y eficacia para la pérdida de peso

    OpenAIRE

    Pérez-Guisado, Joaquín

    2008-01-01

    El consenso internacional es que los carbohidratos son la base de la pirámide alimenticia de una dieta saludable, de tal forma que la mayoría de los especialistas de hoy en día piensan que la mejor forma de perder peso es mediante una reducción en el número total de calorías ingeridas diariamente, principalmente las que vienen en forma de grasa. No obstante, esta revisión intentará demostrar que las dietas cetogénicas son desde un punto de vista fisiológico, bioquímico y práctico, un camino m...

  7. EFECTO DEL GENOTIPO Y DE LA DIETA EN LA DIGESTIBILIDAD RECTAL DE NUTRIENTES Y SALIDA FECAL DE CERDOS CRIOLLO CUBANO

    Directory of Open Access Journals (Sweden)

    Julio Ly

    2011-03-01

    Full Text Available Se usaron cuatro cerdos Criollo Cubanos y cuatro cerdos Cubanos CC21, machos y con un peso inicial de 30 kg de acuerdo con un diseño de cambio en arreglo factorial 2 x 2 para estudiar el efecto del genotipo y de una dieta basada en cereales y granos conteniendo 6 o 12% de fibra cruda, en la digestibilidad rectal y salida fecal de materiales. El consumo de alimento fue igual a 100 g MS/kgPV0.75 por día, suministrado a las 9:00 h am en una sola ración. La fuente de fibra fue palmiche (fruto de palma real, Roystonea regia H.B.K. Cook suministrado seco y molido incluida al 20% al alimento. Los cerdos Criollo Cubanos fueron de la reserva genética localizada en el centro de Cuba (Cabaiguán y no estaban sujetos a ningún programa de mejoramiento genético. No hubo efecto significativo (P>0.05 de la interacción genotipo x dieta en ninguna medida. No se observaron diferencias (P>0.05 en la digestibilidad rectal de la MS, cenizas, materia orgánica, fibra cruda y nitrógeno entre los genotipos de cerdos; los promedios sólo muestran diferencias numéricas en favor de los cerdos CC21. De una manera similar, se halló que la dieta que contenía 12% de fibra, determinó un incremento no significativo (P>0.05 de la digestibilidad rectal de la fibra cruda o una reducción no significativa (P>0.05 de la digestibilidad rectal de la MS, materia orgánica y nitrógeno con respecto a la dieta sin harina de palmiche. La salida fecal de material fresco fue numéricamente mayor en los cerdos Criollo Cubanos y en la dieta con 12% de fibra (675 y 570 g/kg MS ingerida, pero sin efecto significativo (P>0.05. Se considera que la digestibilidad rectal de dietas basadas en granos y cereales que contengan 20% de harina de palmiche pudiera ser mayor en los cerdos Criollo Cubanos que en los mejorados, exóticos, en comparación con lo que ocurre con dietas suministrada ad libitum en animales alimentados con melaza de caña de az

  8. Novos conceitos em nutrição: reflexões a respeito do elo dieta e saúde

    Directory of Open Access Journals (Sweden)

    ANGELIS Rebeca Carlota de

    2001-01-01

    Full Text Available A respeito do elo dieta-saúde, discutem-se os efeitos fisiológicos de alguns alimentos na redução de riscos de doenças degenerativas tais como enfermidades cardiovasculares e certos tipos de câncer. O novo conceito de alimento funcional com efeitos protetores e preventivos é apresentado com alguns exemplos altamente estudados cientificamente . Entre estes a proteção de osteoporose, através de fitoestrôgenos da soja, os aspectos protetores do azeite de oliva e as interferências do método de extração do azeite. Sumarizam-se algumas condutas gerais para obter os nutrientes adequados e suficientes para uma dieta saudável, protetora e preventiva.

  9. Efecto de la adición de nopal ( Opuntia ficus - indica a la dieta de cerdas lactantes sobre la producción y calidad de la leche

    Directory of Open Access Journals (Sweden)

    Ruy Ortiz - Rodríguez

    2017-01-01

    Full Text Available Se evaluó el efecto de la adición de nopal ( Opuntia ficus - indica a la dieta de cerdas lactantes sobre la producción y calidad de la lech e. 22 cerdas hibridas (Yorkshire x Landrace x Pietrain, próximas al parto fueron seleccionadas al azar , con las que se formaron dos grupos (G: G testigo (GT (n=11 cerdas que recibieron alimento balanceado ad libitum y G experimental (GE (n=11 cerdas que recibieron 1% d - 1 de nopal cerda - 1 ( con respecto al peso corporal de la cerda antes del parto más alimento balanceado ad libitum durante 21 días de lactación. Las variables evaluadas fueron: producción láctea en lo s días 6, 10 y 15 postparto, así como los porcentajes de: lactosa, proteína y grasa en leche en los días 3, 11 y 17 de lactación. La información recabada se analizó mediante la metodología de mediciones repetidas y las diferencias entre grupos se obtuviero n a través de medias de mínimos cuadrados. No se encontró efecto de grupo sobre la producción láctea ( P = 0. 4904 . S in embargo , el pico de producción láctea fue a l 15 vo día de lactación: 9.1 y 8.7 kg de leche para GE y GT, respectivamente. Los promedio s (% general es de los componentes físico - quimicos de la leche: lactosa (6.6±0. 5 7 , proteína (4.5±0.4 0 y grasa (7.9±1.6 no fue ron afectado s por el grupo (P>0.05. La adición de nopal a la dieta de cerdas lactantes no modifica la producción ni los componen tes físico - químicos (proteína, lactosa y grasa de la leche de las cerdas lo que asegura el desarrollo del lechón del nacimiento al destete (21 días de edad .

  10. Desempenho de cordeiros alimentados com inclusão de torta de macaúba na dieta

    Directory of Open Access Journals (Sweden)

    Rafael Alves de Azevedo

    2012-11-01

    Full Text Available O objetivo deste trabalho foi avaliar o consumo de nutrientes e o desempenho produtivo e econômico de ovinos confinados da raça Santa Inês, alimentados com dietas com diferentes taxas de inclusão de torta de macaúba. Os animais (24 foram distribuídos em delineamento de blocos ao acaso, nos tratamentos com 0, 100, 200 e 300 g kg-1 de torta de macaúba na matéria seca da dieta, em seis repetições, durante 60 dias de confinamento. A adição de torta de macaúba a taxas crescentes à dieta aumentou linearmente o consumo de proteína bruta, extrato etéreo, fibra em detergente neutro e a conversão alimentar. Não houve diferença no consumo de matéria seca, ganho médio diário e ganho de peso vivo total com a adição da torta. O tratamento com inclusão de 100 g kg-1 apresentou a melhor relação custo:benefício na avaliação das receitas bruta e líquida obtidas com a venda dos animais vivos e abatidos. A adição da torta de macaúba em até 300 g kg-1 da dieta não altera o desempenho produtivo dos animais, entretanto, a inclusão de 100 g kg-1 proporciona melhor retorno econômico.

  11. Dieta de roedores sigmodontinos (Cricetidae en los bosques montanos tropicales de Huánuco, Perú

    Directory of Open Access Journals (Sweden)

    Maggie C. Noblecilla

    2013-06-01

    Full Text Available Se analizó el contenido estomacal de cinco especies de roedores sigmodontinos: Akodon orophilus, Microry-zomys altissimus, M. minutus, Thomasomys notatus yT. kalinowskii, procedentes de los bosques montanos de Huánuco, Perú (2564 - 3850 m de altitud. Concluimos que A. orophiluses insectívora por haber presentado un alto volumen de artrópodos (adultos y larvas en el contenido estomacal (90,1%; mientras que T. notatusy T. kalinowskiison principalmente herbívoras por el alto volumen de materia vegetal, 89% y 67,75% respectiva-mente; y que M. altissimusy M. minutusson omnívoras por presentar volúmenes similares tanto para vegetales como para artrópodos. Thomasomys kalinowskiies considerada generalista por la mayor amplitud de nicho (4,61, mientras A. orophiluses considerada especialista por el menor valor (1,70. Akodon orophilusmostró una preferencia por el consumo de artrópodos adultos al tener un bajo coeficiente de variación (CV= 20% y también un significativo aumento en el consumo de larvas de artrópodos en la época húmeda, siendo la única especie con variación estacional en la dieta. Por otro lado, la sobreposición de nicho fue menor a 0,75 en el 80% de los pares de especies comparados, indicando una baja similitud en la dieta. La mayor similitud en la dieta se observó entre M. altissimus- T. notatus(0,822 y M. minutus - T. kalinowskii(0,816. Se concluye que estos roedores sigmodontinos, simpátricos en los bosques montanos de Huánuco, exhiben dietas disímiles, probablemente como una estrategia para evitar o aminorar la competencia interespecífica.

  12. Dieta del Suri, Rhea pennata (Orbigny, 1834 (Aves: Rheidae, en ecosistemas altoandinos de Moquegua, Perú

    Directory of Open Access Journals (Sweden)

    Marli Echaccaya

    2017-07-01

    Full Text Available Se estudió la dieta del suri Rhea pennata en la región de Moquegua al sur de Perú, mediante el análisis de heces. Esta especie considerada en “Peligro Crítico” en el Perú se mostró como estrictamente herbívora, principalmente folívora. Se identificaron 44 morfoespecies de plantas en su dieta, de las cuales Oxychloe andina (una especie de Juncaceae dominante en bofedales disturbados presentó los mayores valores relativos de densidad, peso, volumen y frecuencia. A pesar de la aparente selectividad, esta especie presenta una dieta muy diversa que le permitiría adaptarse a las carencias nutricionales en el hábitat que ocupa. Los datos obtenidos en diferentes hábitats que ocupa el Suri, muestran que en zonas más áridas existe la tendencia a una mayor selectividad debido a la presencia de plantas con compuestos secundarios (fenoles, terpenos y alcaloides para evitar la herbivoría, mientras que en ambientes con bofedales (como el del presente estudio la selectividad disminuye, tendiendo a alimentarse de las especies dominantes.

  13. Dieta de murciélagos nectarívoros del Parque Nacional Cerros de Amotape, Tumbes

    Directory of Open Access Journals (Sweden)

    Edith Arias

    2011-07-01

    Full Text Available En el Perú se reporta la presencia de 18 especies de murciélagos nectarívoros, sin embargo se cuenta con poca información sobre la dieta de estas especies. En este estudio se reporta por primera vez la dieta de los nectarívoros Glossophaga soricina, Lonchophylla hesperia y Anoura geoffroyi en el bosque seco ecuatorial y del bosque tropical del Pacífico del Parque Nacional Cerros de Amotape, Tumbes. Analizamos 21 contenidos gastrointestinales e identificamos ocho morfotipos de polen pertenecientes a las familias Bombacaceae, Cactaceae, Fabaceae, Solanaceae, Rubiaceae, Myrtaceae, Malvaceae y Rosaceae. Encontramos evidencia del síndrome de quiropterofilia en Bombacaceae, Cactaceae, Fabaceae, Solanaceae y Rubiaceae. Observamos que A. geoffroyi consume polen de Ceiba trichistandra, Solanaceae y Rubiacea; G. soricina consume de Abutilon reflexum, Armathocereus cartwrightianus, C. trichistandra y Rubiaceae; y L. hesperia de A. cartwrightianus, Eriobotrya japonica, Fabaceae y Psidium sp.; sugiriendo una dieta generalista en estas especies. Los murciélagos G. soricina y A. geoffroyi comparten el consumo del ceibo C. trichistandra y de la Rubiaceae, mientras que G. soricina comparte con L. hesperia el consumo del cactus A. cartwrightianus. Los otros morfotipos de polen no fueron compartidos entre murciélagos. Se encuentra además que el ceibo C. trichistandra fue la especie más consumida, especialmente por G. soricina.

  14. Aceitação de dietas em ambiente hospitalar Acceptance of hospital food

    Directory of Open Access Journals (Sweden)

    Anete Araújo de Sousa

    2011-04-01

    Full Text Available OBJETIVO: O objetivo do estudo foi avaliar a aceitação de dietas de pacientes internados em um hospital público do município de Florianópolis, Santa Catarina. MÉTODOS: Realizou-se análise dos restos alimentares de pacientes internados em unidades de internação médica durante 15 dias, por meio do índice resto-ingestão. O índice foi determinado por tipos de dieta, classificadas em normal, especial com sal e especial sem sal. Enquetes de satisfação com pacientes avaliaram os fatores que influenciam a aceitação das refeições. RESULTADOS: O peso total distribuído correspondente a 1.877 refeições foi de 868kg e o peso dos restos totalizou 313kg. Foi encontrado um índice resto-ingestão de 36,09% e um retorno de 53,68%, 33,99% e 33,84% de dietas especiais com sal, normais e especiais sem sal respectivamente. A variedade, a quantidade e a apresentação das refeições foram avaliadas de forma positiva. A temperatura e o uso de temperos foram os aspectos de menor satisfação, representando 43,00% e 34,30%, respectivamente, para os critérios de regular a ruim. O índice resto-ingestão encontrado (36,09% estava acima do aceitável para uma população enferma (20,00%, demonstrando uma perda considerável de alimentos. CONCLUSÃO: A partir dos resultados, observou-se a necessidade de avaliar os processos envolvidos na produção dessas refeições e de elaborar estratégias que estimulem a ingestão alimentar do paciente.OBJECTIVE: This study assessed patients' acceptance of hospital foods in a public hospital located in Florianópolis, Santa Catarina, Brazil. METHODS: The leftover-ingestion index was used to analyze the volume of leftovers of hospitalized patients during 15 days. The index was determined by diet type: normal, special with salt and special without salt. Satisfaction questionnaires were administered to the patients and the factors that influence food acceptance were assessed. RESULTS: The total weight of 1

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

    Directory of Open Access Journals (Sweden)

    Maria Fernanda Miori de Zarzuela

    2012-01-01

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

  16. 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.

  17. 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.

  18. 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.

  19. 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

  20. Evaluación de harina de yuca (20% en combinación con diferentes fuentes protéicas en dietas para pollos de engorde

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    Gómez de Martínez Carmen E.

    1989-06-01

    Full Text Available Se realizó un experimento para evaluar el efecto del nivel óptimo de inclusión (20% de harina de yuca en dietas para pollos de engorde en combinación con tres fuentes proteicas, sobre los rendimientos biológicos y sus resultados económicos. Las variables experimentales consistieron en 4 dietas (tratamientos que presentaron como fuente de variación los ingredientes proteicos; la dieta 10% de harina de yuca y tres fuentes de proteína (torta de soya, harina de pescado y torta de algodón, la dieta 2 con 20% de harina de yuca y las tres fuentes de proteína (torta de soya, harina de pescado y torta de algodón, la dieta 3 con 20% de harina de yuca y dos fuentes de proteína (torta de soya, harina de pescado y la dieta 4 con 20% de harina de yuca y una fuente de proteína (torta de soya. En el período de la 0-7 semanas, hubo comportamiento estadísticamente similar entre las dietas 1 y 2 (ganancia de peso: 1.679 vs 1.678 g; consumo de alimento: 3.521 vs 3A83 g; conversión: 2.09 vs 2.07. La dieta 3 aunque no presentó diferencias estadísticas con las anteriores, produjo menos ganancia de peso. La dieta 4 presentó. más bajas ganancias de peso (1.433 g y el menor consumo de alimento (2.972 g. El peso promedio final de los pollos fue de 1.986 g. (dieta 1, 1.991 (dieta 2, 1.994 (dieta 3 y 1.734 g. (dieta 4. El máximo beneficio neto se obtuvo con la dieta 2.An experiment was carried out to evaluate the effect of including the optimum level (20 % of cassava flour in diets for feed chicken in combination with three sources of protein, on the biological yields and their economic results. The experimental varieties were made up of 4 diets (treatments which varied in terms of the source protein: diet 1, 0% of cassava flour, and cottonseed meal, diet 2 with 20% cassava flour and three sources of protein (soybean meal, fish flour and cottonseed meal, diet 3 with 20% cassava flour and two sources of protein (soybean meal and fish flour, and diet 4

  1. 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....

  2. 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...

  3. 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.

  4. 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.

  5. 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

  6. 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...

  7. Influencia do tempo de exposicao a obesidade induzida por dieta hiperlipidica sobre os colagenos tipo I e III miocardico

    Directory of Open Access Journals (Sweden)

    Danielle Cristina Tomaz da Silva

    2014-03-01

    Full Text Available FUNDAMENTO: A obesidade é um fator de risco para muitas complicações médicas; a pesquisa médica demonstrou que as alterações hemodinâmicas, morfológicas e funcionais estão correlacionadas com a duração e gravidade da obesidade. OBJETIVO: O presente estudo determinou a influência do tempo de exposição à obesidade induzida por dieta com alto teor de gordura no colágenos tipo I e III miocárdico. MÉTODOS: Ratos machos com trinta dias de idade, da raça Wistar, foram distribuídos aleatoriamente em dois grupos: um grupo de controle (C alimentado com ração padrão e um grupo de ratos obesos (Ob alternadamente alimentados com uma de quatro dietas palatáveis ricas em gordura. Cada dieta foi mudada diariamente, e os ratos foram mantidos em suas respectivas dietas por 15 (C15 e Ob15 e 30 (C30 e Ob30 semanas consecutivas. A obesidade foi determinada pelo índice de adiposidade. RESULTADOS: O grupo Ob15 foi similar ao grupo C15 em relação à expressão de colágeno miocárdico tipo I; contudo, a expressão no grupo Ob30 foi menor do que no grupo C30. O tempo de exposição à obesidade foi associado com uma redução de colágeno do tipo I no grupo Ob30, quando comparado com o Ob15. A obesidade não afetou a expressão do colágeno tipo III. CONCLUSÃO: Este estudo mostrou que o tempo de exposição à obesidade por 30 semanas induzida por uma dieta rica em gordura insaturada causou uma redução na expressão do colágeno miocárdico tipo I em ratos obesos. No entanto, nenhum efeito foi observado em relação à expressão do colágeno miocárdico tipo III

  8. Redução de fósforo em dietas para frangos com base em valores de equivalência da fitase

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    Luciana de Paula Naves

    2014-01-01

    Full Text Available O objetivo deste trabalho foi avaliar o uso de valores de equivalência da fitase como base para redução de fósforo disponível (P-disp em dietas para frangos. Foram avaliados dez planos nutricionais com seis repetições de 15 aves cada uma. Avaliaram-se: desempenho, teor de cinzas na tíbia e custo da ração. De 1 a 7 e de 36 a 42 dias de idade, as aves receberam dieta basal; de 8 a 21 dias, dieta sem fitase contendo 3,9 g kg-1 de P-disp e quatro dietas com fitase contendo de 1,1 a 2,5 g kg-1 de P-disp; e de 22 a 35 dias, dieta sem fitase contendo 3,4 g kg-1 de P-disp mais dieta com fitase contendo 1,6 g kg-1 de P-disp. O melhor plano nutricional foi composto pelas dietas: 4,7 g kg-1 de P-disp sem fitase (1 a 7 dias; 2,0 g kg-1 de P-disp suplementada com fitase (8 a 21 dias; 3,4 g kg-1 de P-disp em ração sem fitase (22 a 35 dias; e 3,0 g kg-1 de P-disp em ração sem fitase (36 a 42 dias. A redução do P-disp ocorre no período de 8 a 21 dias de idade e corresponde a 2,0 g kg-1 de ração suplementada com fitase.

  9. 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.

  10. Enzimas exógenas em dietas de frangos de corte: desempenho Exogenous enzymes in broilers fed diets: performance

    Directory of Open Access Journals (Sweden)

    Nei André Arruda Barbosa

    2012-08-01

    Full Text Available O experimento foi conduzido para avaliar a eficiência de enzimas exógenas em dietas sobre o desempenho de frangos de corte. Um total de 1440 pintos de corte machos (Cobb 500® foram distribuídos em um delineamento inteiramente casualizado em esquema fatorial 2x2 (duas dietas com diferentes densidades nutricionais; com e sem a adição enzimática com 8 repetições de 45 aves em cada unidade experimental. As dietas com diferentes densidades nutricionais foram: controle positivo (níveis normais e um controle negativo (com redução de 4,3 e 4,5% de energia metabolizável; 16,7 e 17,7% de cálcio e 35 e 42,7% de fósforo, nas fases inicial e de crescimento, respectivamente. A suplementação enzimática consistiu da combinação das enzimas fitase (100g t-1 e amilase, xilanase e protease (500g t-1. Foi avaliado o desempenho das aves nas fases de 1 a 21 e 1 a 42 dias de idade. Na fase total de criação, as aves alimentadas com a dieta controle negativo com adição enzimática tiveram consumo de ração (5,97%, peso médio (8,47%, ganho de peso (8,64% e conversão alimentar (2,92% melhores (P0,05 ao grupo alimentado com a dieta controle positivo com ou sem enzima. A adição de enzimas exógenas em dieta de frangos de corte com redução de energia metabolizável, cálcio e fósforo, proporciona um consumo de ração, peso vivo médio e ganho de peso similar a uma dieta com níveis nutricionais adequados.The experiment was conducted to evaluate the effect of enzyme efficiency in diets with and without nutrient reduction on the performance of broilers. Thousand and hundred forty male broiler chicks (Cobb 500® were distributed in a completely randomized design with 4 treatments in a factorial 2x2 (two diets with different nutrient densities, with and without enzyme with 8 replications of 45 birds. The diets were: positive control (normal and a negative control (with a reduction of 4.3% and 4.5% of metabolizable energy, 16.7% and 17.7% of

  11. Relación valina:lisina digestible en la dieta de pollos de engorda

    Directory of Open Access Journals (Sweden)

    Alexandra Potença

    2015-01-01

    Full Text Available El objetivo fue evaluar el efecto de la relación valina:lisina digestible (Val:Lys dig en la dieta de pollos de engorda en el período de 1 a 14 días de edad sobre el comportamiento productivo, emplume, diámetro y perfil de fibras musculares. Se utilizaron 1,800 pollos de engorda Cobb de un día de edad, distribuidos en un diseño experimental completamente al azar con cinco tratamientos, seis repeticiones y 36 aves por unidad experimental. Los tratamientos consistieron de diferentes relaciones de Val:Lys dig (66, 71, 76, 81 y 86 %. La relación Val:Lys dig no afectó ( P >0.05 el comportamiento productivo de las aves. Sin embargo, hubo efecto lineal positivo ( P 0.05 por los tratamientos. Se concluye que la relación Val:Lys de 66 % es suficiente para maximizar el comportamiento productivo de pollos de engorda en la fase de 1 a 14 días, no obstante, una mayor relación de Val:Lys dig (76 % es necesaria para maximizar el crecimiento de las fibras musculares.

  12. I wish no living thing to suffer pain . Percy Bysshe Shelley e la dieta vegetariana

    Directory of Open Access Journals (Sweden)

    Franco Lonati

    2016-12-01

    Full Text Available Percy Bysshe Shelley è stata forse la prima celebrità vegetariana dell’età moderna e certamente uno dei primi autori che ha affrontato, con la forza della sua erudizione e la passione della sua retorica, il tema della dieta naturale, non solo illustrandone i presunti benefici fisici, ma anche fornendo una giustificazione filosofica, e rivendicando l’importanza etica, di una scelta radicale. Shelley è diven¬tato, non a caso, una sorta di nume tutelare e di ideologo di riferimento dei movimenti vegetariani e vegani che negli ultimi anni hanno conquistato sempre più adepti, e citazioni tratte dalle sue opere compaiono immancabilmente sui più popolari siti specializzati. L’articolo considera le radici e lo sviluppo del vegetarianesimo di Shelley attraverso l’analisi di Queen Mab e delle note all’opera poi pubblicate col titolo A Vindication ofNaturalDiet (1813, per riflettere sull’attualità delle teorie di un poeta/filosofo sorprendentemente in anticipo sui tempi.

  13. Nota sobre la dieta de la Lechucita Bigotona, Xenoglaux loweryi en Yambrasbamba, Amazonas

    Directory of Open Access Journals (Sweden)

    Alejandro Alarcón

    2016-12-01

    Full Text Available En este trabajo se dan a conocer los resultados del análisis de heces de la Lechucita Bigotona (Xenoglaux loweryi, especie endémica de Perú y en peligro de extinción según IUCN, que habita los bosques montanos húmedos de la cordillera Oriental de los Andes. Entre enero y setiembre de 2014, durante evaluaciones sobre la ecología de este búho en el área de bosque montano conocido como “La Jalca”, en la comunidad de Yambrasbamba, Amazonas; se colectaron cuatro muestras de heces de diferentes individuos, en los meses de mayo, julio, agosto y setiembre correspondientemente. Estos fueron analizados, encontrándose fragmentos característicos del orden Coleoptera, Hymenoptera, Ortoptera y Lepidoptera. Confirmándose que parte de su dieta son pequeños insectos; al igual que otros pequeños estrígidos.

  14. Uso da Valeriana officinalis em dietas de codornas japonesas na fase de postura

    Directory of Open Access Journals (Sweden)

    Rodrigo Antonio Gravena

    2009-06-01

    Full Text Available http://dx.doi.org/10.5007/2175-7925.2009v22n4p185 Este estudo teve como objetivo avaliar o efeito da Valeriana officinalis sobre o estresse de codornas japonesas na fase postura, analisando-se parâmetros de desempenho, comportamental e fisiolόgico. Foram utilizadas 192 aves dos 43 aos 140 dias de idade, distribuídas em blocos casualizados e submetidas a quatro níveis de valeriana (controle, 250, 500 e 750mg/Ng de ração com oito repetições e seis aves por parcela. Foram avaliados parâmetros de desempenho (conversão alimentar por dúzia de ovos, conversão alimentar por massa de ovos, consumo de ração, peso dos ovos, porcentagem de postura e viabilidade, comportamentais (tempo em imobilidade tônica, observação focal e ferimentos corporais e fisiolόgicos (níveis plasmáticos de corticosterona e relação heterόfilo:linfόcito. Os resultados obtidos na fase de postura demonstraram que a valeriana adicionada na dieta não foi capaz de reduzir o estresse das aves e não afetou o desempenho produtivo.

  15. Características físico-químicas de derivados proteicos de soja em dietas extrusadas para cães Physical-chemical characteristics of soy-protein derived in extruded diets for dogs

    Directory of Open Access Journals (Sweden)

    Ananda Portella Félix

    2010-12-01

    Full Text Available A soja é um grão rico em proteínas e lipídeos, a partir do qual se obtém diversos derivados proteicos de alto valor nutricional. Em virtude disso, realizou-se este estudo com o objetivo de analisar a composição bromatológica de derivados proteicos de soja, bem como as características físico-químicas dos extrusados formados a partir destes. Foram formuladas seis dietas para cães, uma referência e cinco contendo 30% de derivados de soja (farinha desengordurada - FDS, micronizada, farelo, grão integral e grão tostado, as quais foram extrusadas. Os derivados de soja e as dietas foram submetidos a análises bromatológicas e de qualidade do processamento. A FDS e o farelo de soja apresentaram os maiores teores de proteína bruta, enquanto os grãos de soja integral e tostado e a soja micronizada apresentaram os maiores teores de extrato etéreo em hidrólise ácida e energia bruta. A soja grão integral apresentou a maior atividade ureásica e inibitória de tripsina, mesmo após a extrusão da dieta. Os extrusados contendo as sojas grão e micronizada apresentaram as maiores densidades e as menores durezas, índice de absorção de água e grau de gelatinização do amido. Derivados proteicos de soja apresentam alto valor nutricional, entretanto, devem ser termicamente processados antes da extrusão para completa inativação do inibidor de tripsina. Além do mais, derivados contendo alto teor de lipídeos, como soja grão e micronizada, quando adicionados em 30% da fórmula, comprometem a qualidade do extrusado.Soy is a grain rich in protein and lipids, from which its obtained different protein products of high nutritional value. This study aimed to analyze the chemical composition of different soy-protein products, as well as the characteristics of the extruded produced. Six diets were formulated, a reference and five with 30% soy product (defatted soy flour - DSF, micronized, soybean meal, crude grain or toasted grain, which were

  16. 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

  17. 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...

  18. 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...

  19. 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.

  20. 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.

  1. 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...

  2. 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.

  3. 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...

  4. 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.

  5. 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...

  6. 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...

  7. 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

  8. 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.

  9. 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”,.

  10. 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

  11. 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.

  12. 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.

  13. 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.

  14. 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.

  15. 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....

  16. 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...

  17. 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.

  18. Desenvolvimento pós-embrionário de Pattonella intermutans (Thomson (Diptera: Sarcophagidae em diferentes dietas Post-embryonary development of Pattonella intermutans (Thomson, 1869 in different diets

    Directory of Open Access Journals (Sweden)

    Marcio S. Loureiro

    2005-03-01

    Full Text Available A proposta deste estudo foi de avaliar o desenvolvimento pós-embrionário de Pattonella intermutans (Thomson, 1869 em dietas artificiais preparadas com agar-agar. Dieta D1: leite em pó integral + fermento biológico; Dieta D2: leite em pó integral + fermento biológico + caseína; Dieta D3: leite em pó integral + ovo cru; Dieta D4: carne bovina moída (dieta controle. A carne bovina moída foi a dieta mais eficiente (peso larval de 195,63 mg e viabilidade de neolarva a adulto de 86,5%, quando comparada com as dietas artificiais. Os seguintes resultados foram obtidos para o grupo experimental: Dieta D3: 180,15 mg e 63,5%; Dieta D2: 141,07 mg e 61% e na Dieta D1: 147,98 mg e 51,5%.The purpose of this study was to evaluate the post-embryonary development of Pattonella intermutans (Thomson, 1969 in artificial diets composed of agar-agar. Diet D1: whole dried milk + dried brewer's yeast; Diet D2: whole dried milk + dried brewer's yeast+ casein; Diet D3: whole dried milk + whole egg; Diet D4: bovine meal (control diet. The bovine meat was the best diet (larval weight 195.63mg and viability from larvae to adult 86,5%, when compared to all other artificial diets. The following performances were obtained for experimental groups: diet D3: 180.15 mg and 63.5%; diet D2: 141.07 mg and 61% and diet D1: 147.98 mg e 51.5%.

  19. Consumo e digestibilidade aparente em bezerros da raça holandesa alimentados com dietas contendo diferentes níveis de volumoso

    Directory of Open Access Journals (Sweden)

    Ricardo Dias Signoretti

    1999-02-01

    Full Text Available O objetivo deste trabalho foi avaliar o efeito de diferentes níveis de volumoso nas dietas sobre os consumos e as digestibilidades aparentes de matéria seca (MS, matéria orgânica (MO, proteína bruta (PB, extrato etéreo (EE, fibra em detergente neutro (FDN, carboidratos totais (CHOT e energia bruta (EB e sobre os consumos de nutrientes digestíveis totais (NDT. Trinta e cinco bezerros da raça Holandesa puros por cruzamento, não-castrados, com idade média de 60 dias e peso vivo inicial de 78 kg, foram distribuídos em delineamento inteiramente casualizado, com nove repetições por dieta, exceto para a dieta com 10% de volumoso, com oito repetições. Os animais foram alimentados à vontade com dietas contendo níveis de 10, 25, 40 e 55% de volumoso, na base da MS, usando-se feno de capim coast-cross (Cynodon dactylon, fubá de milho e farelo de soja, os quais constituíram dietas com aproximadamente 16% de PB. O óxido crômico foi usado para obtenção das estimativas dos fluxos de MS fecal. Os carboidratos totais foram obtidos por 100 - (%PB + %EE + %Cinzas. O consumo de NDT foi obtido por (cPB - PBf + 2,25 (cEE - EEf + (cCHOT - CHOTf, em que c significa consumo e f, excreção fecal. Não houve efeito dos níveis de volumoso nas dietas sobre os consumos de MS e MO (kg/dia, % PV e g/kg0,75 e de PB e CHOT (kg/dia e % PV. O consumo de FDN (kg/dia, %PV e g/kg0,75 aumentou, enquanto o consumo de EE e NDT (em kg/dia e %PV reduziu linearmente em função dos níveis de volumoso na dieta. Houve efeito linear decrescente sobre as digestibilidades aparentes de MS, MO, PB, EE, CHOT e EB, em função do aumento dos níveis de volumoso nas dietas, enquanto a digestibilidade aparente da FDN não foi influenciada. Os consumos de EE, FDN e NDT e as digestibilidades aparentes de MS, MO, EE, PB, CHOT e EB foram influenciados pelos níveis de volumoso nas dietas.

  20. 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.

  1. 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.

  2. [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.

  3. 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.

  4. 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.

  5. 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.

  6. 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.

  7. 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.

  8. 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.

  9. 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.

  10. Valoración de una dieta hipercalórica en el desarrollo de osteoporosis en ratas Sprague-Dawley gonadectomizadas

    Directory of Open Access Journals (Sweden)

    Mónica A. Gutiérrez

    1995-09-01

    Full Text Available El trabajo se inició con 34 ratas Sprague-Dawley de siete semanas de edad, de las cuales 26 se sometieron a gonadectomía bilateral para inducirles la menopausia. El grupo control quedó constituido por las restantes 8 ratas no gonadectomizadas. Para evaluar la influencia de la dieta hipercalórica en el desarrollo de osteoporosis, a 13 ratas gonadectomizadas se les suministró una dieta rica en grasa (grupo A, mientras que las otras 13 ratas (grupo B y el grupo control recibieron una dieta regular. Cinco meses después de la ovariectomía, la dieta hipercalórica causó la disminución del contenido de calcio en vértebras lumbares (L3, L4 y L5, mostrándose el efecto de la dieta en cuanto a que, bajo la ingesta de los demás nutrientes, se modificó su utilización, causando una desnutrición generalizada y cooperando así con el proceso de génesis de la osteoporosis. La ovariectomía indujo cambios hormonales que favorecieron el proceso de desmineralización condicionante de osteoporosis, validándose así el modelo experimental.

  11. Recria e terminação de borregas mestiças em confinamento alimentadas com níveis crescentes de concentrado na dieta

    Directory of Open Access Journals (Sweden)

    Caroline Bertholini Ribeiro

    2016-12-01

    Full Text Available Objetivou-se avaliar dietas com níveis crescentes de concentrado para borregas confinadas e estabelecer a proporção de concentrado ideal para maximizar a utilização dos nutrientes e o desempenho durante as fases de recria e terminação. Foram confinadas 24 borregas alimentadas com feno de capim-Tifton e níveis crescentes de concentrado na dieta (20, 40, 60 e 80% para avaliação individual do consumo de matéria seca (CMS, digestibilidade dos nutrientes das dietas, ganho médio diário (GMD e eficiência alimentar (EA. As borregas foram abatidas com 47 kg. Na fase de recria, o CMS não foi alterado (P>0,05 pela inclusão de concentrado nas dietas (1176 g/dia. Foi observado efeito quadrático dos níveis de concentrado (P0,05. O CDMS e o valor de NDT apresentaram comportamento quadrático (P0,05. Recomenda-se a inclusão de 71,50% de concentrado na dieta de borregas para maximizar o aproveitamento dos nutrientes e o desempenho na fase de recria e 72,3% de concentrado para fase de terminação.

  12. 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...

  13. Efeito de dietas semi-simplificadas formuladas com subprodutos de mandioca ensilados ou não sobre o desempenho e características de carcaça de coelhos - doi: 10.4025/actascianimsci.v33i1.9643 Effect of half-simplified diets formulated with cassava by-product ensiled or not on performance and carcass characteristics of rabbits - doi: 10.4025/actascianimsci.v33i1.9643

    Directory of Open Access Journals (Sweden)

    Ana Carolina Monteiro

    2011-02-01

    Full Text Available Foram avaliados o desempenho da desmama ao abate e as características de carcaça de 144 coelhos da raça Nova Zelândia Branco, oriundos de matrizes alimentadas com dietas referência ou semi-simplificada com 79,83% de subprodutos de mandioca, distribuídos em gaiolas, em esquema fatorial 2 x 3 (duas rações fornecidas às matrizes e láparos até a desmama versus três rações fornecidas aos animais da desmama até o abate com 12 repetições e dois animais por unidade experimental. As dietas fornecidas, após a desmama, consistiram de uma referência e duas semi-simplificadas com 81,63% de subprodutos de mandioca ensilados ou não antes da sua incorporação. Coelhos cujas mães foram alimentadas com dieta semi-simplificadas se apresentaram mais leves à desmama que os desmamados com dieta-referência. Observou-se menor consumo de ração para os coelhos que receberam a dieta maternidade semi-simplificada até a desmama, resultando em melhor conversão alimentar. Os pesos da carcaça e dos cortes comerciais foram maiores nos animais alimentados com as rações referência maternidade e referência crescimento. O uso de dietas semi-simplificadas com subprodutos de mandioca ensilados ou não, da desmama ao abate, reduziu o ganho de peso diário e o consumo de ração, porém melhorou a conversão alimentar e diminuiu o custo de ração. A utilização das rações semi-simplificadas apresenta-se como alternativa interessante para a produção de coelhos.This study evaluated the performance from weaning to slaughter and carcass characteristics of 144 New Zealand White rabbits, from does fed with a reference diet or half-simplified diet containing 79.83% cassava by-product, allocated in iron cages, in a 2 x 3 factorial arrangement (two diets used for does and litters until weaning versus three diets supplied for animals from weaning to slaughter with 12 replications and two animals per experimental unit. The supplied diets after weaning

  14. 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.

  15. Uso de edulcorante como palatabilizante na dieta de leitões desmamados

    Directory of Open Access Journals (Sweden)

    Fabio Enrique Lemos Budiño

    2014-01-01

    Full Text Available Objetivou-se determinar os efeitos da adição de um edulcorante a base de Stevia rebaudiana como palatabilizante em dietas de leitões desmamados sobre o desempenho (ganho diário de peso, consumo diário de ração e conversão alimentar e a incidência de diarreia. Foram utilizados 72 leitões, homogêneos quanto à linhagem (Large White x Landrace, desmamados aos 23 dias de idade, pesando em média 7,60 ± 0,90 kg. Foi utilizado o delineamento em blocos completos casualizados, sendo que a unidade experimental foi constituída por dois animais, submetidos a quatro tratamentos com nove repetições cada. Os animais, em grupos de dois (macho castrado e fêmea foram alojados em baias metálicas suspensas. O desempenho dos leitões foi avaliado no período I (23 a 37 dias de idade, período II (37 a 51 dias de idade, período III (51 a 65 dias de idade e período total (23 a 65 dias de idade. Os tratamentos consistiram de rações contendo níveis crescentes (0,00; 0,125; 0,250 e 0,500% de inclusão de edulcorante. Esses níveis de inclusão foram utilizados nos períodos I e II, enquanto no período III as inclusões de edulcorante foram reduzidas em 50%, ou seja, 0,00, 0,0625, 0,125 e 0,250%, respectivamente. Não ocorreram casos graves de diarreia nos primeiros 15 dias do ensaio nos tratamentos estudados. Não foram observadas diferenças significativas (P>0,05 em nenhuma das variáveis de desempenho estudadas nos períodos I, II e total. Durante o período III, houve efeito quadrático tanto no ganho diário de peso (P=0,0158 quanto na conversão alimentar (P=0,0252. A adição de palatabilizante a base de Stevia na dieta de leitões desmamados influenciou o desempenho destes dos 51 aos 65 dias de idade, sendo que o nível ótimo calculado de inclusão do edulcorante que proporcionou melhores ganho diário de peso e conversão alimentar foi de 0,265 e 0,286%, respectivamente.

  16. Digestibilidade aparente de dietas com diferentes níveis de farelo de canola para cavalos

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    Oliveira Kátia de

    2001-01-01

    Full Text Available Foram utilizados quatro eqüinos, machos, com média de 3,5 anos e peso vivo entre 400-450 kg, distribuídos em um delineamento experimental em quadrado latino 4 x 4 (período x animal. Os níveis de inclusão do farelo de canola nas rações foram de 0,0; 2,5; 4,5 e 7,0%, substituindo, respectivamente, 0; 35; 65 e 100% da proteína bruta (PB do farelo de soja. As rações foram isoprotéicas (13% PB e isocalóricas (4250 kcal/kg. Utilizou-se o método de coleta total de fezes para determinação dos coeficientes de digestibilidade dos nutrientes. Não houve efeito entre os níveis de substituição da proteína bruta do farelo de soja pelo farelo de canola para nenhum dos nutrientes avaliados. Os valores médios obtidos para os coeficientes de digestibilidade aparente da matéria seca, energia bruta, proteína bruta, fibra em detergente neutro e fibra em detergente ácido foram, respectivamente, 64,04; 55,82; 62,89; 51,20 e 42,05%. Os concentrados para eqüinos podem ser formulados com substituição total da proteína bruta do farelo de soja pelo farelo de canola (nível de inclusão de 7%, sem afetar adversamente a digestibilidade dos nutrientes, tornando-se, assim, uma fonte protéica alternativa para as dietas desta espécie.

  17. 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.

  18. Papel protector de la dieta Mediterránea sobre el Índice de Hígado Graso. Estudio PREDIMED-Málaga

    OpenAIRE

    Cueto Galán, Raquel

    2016-01-01

    ANTECEDENTES La dieta Mediterránea está asociada con una disminución en la prevalencia del síndrome metabólico donde el hígado graso es el componente hepático. No obstante, los efectos de esta dieta sobre las enzimas hepáticas y el hígado graso apenas están explorados, es más, los mecanismos subyacentes en relación con el hígado graso y una dieta Mediterránea enriquecida con aceite de oliva o frutos secos no han sido aún estudiados. El Índice de Hígado Graso (FLI, Fatty Liver Index), ha si...

  19. Evaluación de cuatro tipos de leche en la dieta larvaria de Cochliomyia hominivorax (coquerel

    Directory of Open Access Journals (Sweden)

    Andrés Álvarez Jiménez

    2005-12-01

    Full Text Available La Comisión México Americana para la Erradicación del Gusano Barrenador del Ganado produce actualmente un promedio de 100 millones de moscas estériles a la semana, para ser enviadas a los centros de dispersión de Panamá, Aruba y Jamaica, en los cuales se espera erradicar al Gusano Barrenador del Ganado (GBG. Por esto, y pensando en los países que en un futuro requieran de estas moscas estériles para la erradicación del GBG, la Comisión México Americana se encuentra en una constante búsqueda de mejoras en el proceso de producción. Para lograr este objetivo cuenta con una unidad de investigación en el departamento de desarrollo de métodos, donde se encargan de mantener la cepa de la mosca y de realizar diferentes tipos de pruebas que buscan mejorar la producción masiva de moscas estériles del GBG. La comisión recibió de la compañía Purina cuatro muestras de sustituto de leche en polvo para su uso en la dieta del Gusano Barrenador (Nodricina 200, Nodricina Premium 20/20, Nodricina Plus 20-20 y sustituto de leche para becerros, estas se evaluaron en una prueba completa para determinar la existencia de diferencias significativas en el desempeño de la larva en dietas que incluyan a estos componentes. Se realizaron cinco réplicas, con tres charolas de 16 L por tratamiento para un total de 15 charolas por réplica. Midiendo y evaluando los parámetros de la cepa Jamaica 03 del Gusano Barrenador del Ganado para determinar el comportamiento de estos sustitutos en la dieta larvaria, y evaluar la posible utilización de los mismos.

  20. Żywienie a płodność. Dieta kobiet w okresie prokreacyjnym

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    Dorota Świątkowska

    2013-04-01

    Full Text Available Prawidłowe żywienie oraz tryb życia w okresie poprzedzającym ciążę oraz w trakcie jej trwania są niezmiernie ważne dla rozwijającego się płodu, wpływają na prawidłowy przebieg ciąży i stan zdrowia kobiety ciężarnej. Aktualnie wiek kobiet wchodzących w okres prokreacji waha się między 15. a 49. rokiem życia. Tak duża rozpię‑ tość wiekowa wiąże się z odmiennymi problemami charakteryzującymi dany wiek mającymi wpływ na prokreację. Kobiety, które pragną zajść w ciążę, mniej więcej 6 miesięcy przed planowanym poczęciem powinny zmienić tryb życia i zacząć przestrzegać prawidłowej diety. Racjonalna dieta powinna obejmować pięć posiłków dziennie i być zbilansowana pod względem wartości odżywczej. Kaloryczność diety należy ustalić indywidualnie, uwzględnia‑ jąc rodzaj i częstotliwość aktywności fizycznej. Szczególnie ważne jest urozmaicenie diety. Trzeba wziąć pod uwagę alergie i nietolerancje pokarmowe oraz konieczność stosowania produktów z niskim indeksem glikemicznym. Warto wybierać odpowiedni rodzaj tłuszczu. Bezwzględnie należy wyeliminować tłuszcze trans, obecne w przemysłowo produkowanych ciastach, słodyczach, chipsach, żywności typu fast food, zupach w proszku, twardych margarynach. Tłuszcze te można zastąpić produktami bogatymi w jedno- i wielonienasy‑ cone kwasy tłuszczowe. Należy zadbać o produkty białkowe pochodzenia zarówno zwierzęcego, jak i roślinne‑ go – dieta powinna obejmować: chude mięso drobiowe, cielęce, w ograniczonych ilościach chude mięso wie‑ przowe i wołowe, ryby (głównie morskie, jaja oraz produkty strączkowe (fasola, groch, soczewica, ciecierzyca, soja. Produkty bogate w węglowodany złożone powinny stanowić ponad połowę zapotrzebowania energetycznego. Warto wybierać pełnoziarniste pieczywo, kasze, makarony, płatki zbożowe. Zawartość białka, tłuszczu, węglowodanów, witamin i sk

  1. Dietas hipoglucídicas e hiperproteicas : efeitos na sensibilidade à insulina em adultos pré-obesos [e] obesos

    OpenAIRE

    Vilaça, Cecília Teresa Pinheiro

    2008-01-01

    Introdução – Actualmente muito se tem escrito no que respeita à segurança e à eficácia de algumas abordagens terapêuticas para o controlo da obesidade e suas comorbilidade associadas, sendo várias as opiniões contraditórias. Através desta Monografia pretendeu-se realizar uma revisão bibliográfica dos efeitos da utilização de uma Dieta Hipoglucídica (HG) e Hiperproteica, uma abordagem ainda pouco convencional mas que tem sido alvo de diversos estudos, na sensibilidade à insulina, factor de ris...

  2. Causas de desapego a tratamiento, dieta y seguimiento de pacientes con diabetes y factores asociados con la enfermedad

    OpenAIRE

    De la Cruz Maldonado, María Guadalupe; Vargas Morales, Juan Manuel; Ledezma Tristán, Erika Selene; Holguín Carrillo, Mariana Carolina; Martínez Castellanos, Alan Ytzeen; Fragoso Morales, Lilia Esperanza

    2013-01-01

    La Diabetes Mellitus (DM) es un problema de salud pública mundial que se presenta en una gran cantidad de países. En la región de las Américas, para el 2007, la mortalidad evitable por DM fue de 22,000 casos. México ocupa el segundo lugar mundial en prevalencia de diabetes y se estima que para 2018 podría ocupar el primer lugar. En este estudio se presentan las principales causas de desapego al tratamiento farmacológico y dieta indicada, en pacientes de un municipio de San Luis Potosí.Las pri...

  3. Qualidade da dieta de pré-escolares de 2 a 5 anos residentes na área urbana da cidade de Pelotas, RS

    Directory of Open Access Journals (Sweden)

    Katharine Konrad Leal

    2015-09-01

    Full Text Available ResumoObjetivo:Avaliar a qualidade da dieta de pré-escolares residentes na área urbana da cidade de Pelotas, Rio Grande do Sul, Brasil.Métodos:A qualidade da dieta foi avaliada de acordo com o Índice de Alimentação Saudável (IAS, adaptado para o Brasil. O consumo alimentar foi medido por meio de Questionário de Frequência Alimentar. O escore do índice foi obtido por uma pontuação distribuída em 13 grupos alimentares, que caracterizam diferentes aspectos de uma dieta saudável, variação de 0 a 100 pontos. Quanto mais próximo de 100, melhor será a qualidade da dieta.Resultados:A qualidade da dieta foi avaliada em 556 pré-escolares. O valor médio do escore do IAS foi de 74,4 pontos. Isso indica que as dietas necessitam ser melhoradas. As médias dos escores foram significativamente maiores entre as meninas e entre crianças provenientes de famílias com renda familiar entre um e menos de três salários mínimos mensais.Conclusões:As crianças apresentaram consumo de verduras e legumes abaixo da recomendação, enquanto os alimentos do grupo dos óleos e gorduras, bem como do grupo dos açúcares, balas, chocolates e salgadinhos, foram consumidos em excesso. É importante reforçar orientações para promover um hábito alimentar mais saudável, que poderá perdurar em etapas posteriores da vida

  4. 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.

  5. 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...

  6. 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.

  7. Índices dietéticos para avaliação da qualidade de dietas Dietetic indices for assessment of diet quality

    Directory of Open Access Journals (Sweden)

    Ana Carolina Pinheiro Volp

    2010-04-01

    Full Text Available A relação entre dieta e saúde pode ser avaliada pelo nível de alguns componentes do alimento (nutrientes, tipos de alimento, grupo ou grupos de alimentos e padrões alimentares. A associação entre estes parâmetros e várias doenças crônicas pode ser analisada por meio da adoção de instrumentos dietéticos de avaliação global de dietas e, para tanto, vários índices têm sido propostos. Este trabalho tem como objetivo descrever os diferentes índices para avaliação da qualidade de dietas, incluindo o Índice de Nutrientes, Escore da Variedade da Dieta, Escore da Diversidade da Dieta, Índice de Qualidade da Dieta, Índice de Alimentação Saudável, Índice de Qualidade da Dieta Revisado, Índice de Alimentação Saudável Alternativo, Contagem de Alimentos Recomendados e Escore da Dieta Mediterrânea Alternativo, bem como suas derivações. Esses índices apresentam uma evolução do conceito de qualidade, enfatizando as propriedades funcionais dos fatores dietéticos relacionados à redução do risco das doenças mais prevalentes na atualidade.The relation between diet and health can be evaluated by the level of some food components (nutrients, kinds of food, group or food groups and eating patterns. The association between these parameters and some chronic diseases can be examined by dietary instruments of global diet assessments and some indices have been considered for this end. The aim of this work was to describe the different indices for assessing diet quality, including the Index of Nutrients, Dietary Variety Score, Dietary Diversity Score, Diet Quality Index, Healthy Eating Index, Diet Quality Index Revised, Alternative Healthy Eating Index, Recommended Food Score, Alternative Mediterranean Diet Score, as well as their derivations. These indices show an improvement in the concept of quality, emphasizing the functional properties of food components related to risk reduction of the most prevalent diseases nowadays.

  8. Estudo sobre a ocorrência de fungos e aflatoxina B1 na dieta de bovinos leiteiros em São Paulo

    OpenAIRE

    Motta,Thiago P.; Frizzarin,Adriana; Martins,Thamires; Miranda,Mariana S.; Arcaro,Juliana R.P.; Ambrósio,Luiz A.; Pozzi,Claudia R.

    2015-01-01

    A qualidade da dieta ofertada às vacas em lactação é uma preocupação dos agentes de saúde devido à possibilidade da detecção de micotoxinas prejudiciais a saúde humana e animal. Os objetivos do trabalho foram avaliar o perfil da micobiota, determinar a atividade de água (Aa) e a ocorrência natural de aflatoxina B1 (AFB1) em dietas ofertadas a vacas em lactação de fazendas leiteiras no estado de São Paulo, Brasil. ...

  9. Crecimiento de alevines de Cichlasoma urophthalmus con dietas basadas en diferentes niveles de inclusión de proteína de soya y gluten de trigo

    OpenAIRE

    Villarreal, C; Gelabert, R; Gaxiola, G; Cuzon, G; Amador, LE; Guevara, E; Brito, R

    2011-01-01

    Se determinó el efecto de seis dietas con diferente contenido de proteína de origen vegetal sobre el crecimiento de alevines de Cichlasoma urophthalmus. Se utilizaron dietas isoenergéticas e isolipídicas con contenido de proteína entre 10% y 60%, empleando soya y gluten de trigo como las principales fuentes proteicas. Los tratamientos no afectaron la supervivencia, la cual fue superior al 80% en todos los casos. Los índices de crecimiento variaron significativamente de acuerdo al contenido pr...

  10. Evaluación de dietas artificiales con artemia adulta en la maduración y reproducción de penaeus vannamei

    OpenAIRE

    Zambrano Carranza, Byron R.

    1999-01-01

    Evaluación de dietas artificiales con Artemia adulta en la maduración y reproducción de Penaeus vannamei Un experimento de maduración y reproducción de P. vannamei fue llevado a cabo en tanques de 18 toneladas para (a) comprobar los efectos de la Artemia adulta como ingrediente principal en dietas artificiales, (b) investigar si existen diferencias entre la implementación de liofilizado de Artemia adulta y Artemia adulta congelada, y finalmente (c), comparar estos efectos y resultados con ...

  11. Observaciones histopatologicas de juveniles penaeus vannamei sometidos a dietas artificiales con diferentes concentraciones de una sal de ácido ascórbico (vitamina c)

    OpenAIRE

    Vera Muñoz, L.

    1995-01-01

    Observaciones histopatologicas de juveniles Penaeus Vannamei sometidos a dietas artificiales con diferentes concentraciones de una sal de ácido ascórbico (vitamina C) Se realizaron análisis histológicos y comprobación mediante métodos histoquímicos de la presencia de melanina, a juveniles Penaeus vannamei sometidos a cinco dietas experimentales con diferentes concentraciones de una sal de L-Ascorbato-2-Fosfato de Mg (APM) usada como fuente de ácido ascórbico (AA).

  12. EFECTO DEL USO DE ADITIVOS EN DIETAS DE CODORNICES REPRODUCTORES (Coturnix coturnix japonica) BAJO CONDICIONES DE VERANO EN LA COSTA CENTRAL

    OpenAIRE

    Ciriaco Castañeda, Pedro; Facultad Zootecnia, Dpto. de Produccion Animal de la Universidad Nacional Agraria La Molina (Perú).; Roncal Ñañez, Henry David; Ing. Zootecnista (Perú).

    2016-01-01

    Se evaluaron los efectos de la adición en la dieta de 0.05% del Complejo B, 0.05% de Vitamina C, 0.2% de Bicarbonato de Sodio y 0.05% de Ácido Acetil Salicílico, sobre los parámetros productivos y reproductivos de codornices japonesas en época de verano en la costa central del Perú (Lima), con temperatura ambiental promedio de 25°C. Codornices reproductores (270 hembras y 90 machos) de 48 días de edad, fueron distribuidas en cinco tratamientos (4 con aditivos y una dieta control) con tres rep...

  13. Efecto de Gentianella alborosea en esteatosis hepática no alcohólica inducida por dieta hiperlipídica en ratas holtzman hembras

    OpenAIRE

    L Ugaz-Soto; JH Zafra-Tanaka; María E. Tapia Vicente

    2013-01-01

    Objetivo: Determinar el efecto del extracto de Gentianella alborosea como tratamiento contra esteatosis hepática no alcohólica (EHNA)  inducida por dieta hiperlipídica en ratas Holtzman hembras. Métodos: Diseño: Estudio experimental incompleto. Lugar: Universidad Nacional Mayor de San Marcos, Lima, Perú. Participantes: Ratas Holtzman hembras. Intervenciones: Se utilizó 32 ratas repartidas en 4 grupos (n=8) distribuidos aleatoriamente: grupo control negativo, control positivo con dieta hiperli...

  14. Exercicio fisico associado a diferentes teores de proteina na dieta : estudo das alterações bioquimicas e corporais em ratos adultos

    OpenAIRE

    Marcelina Rodrigues Parreira

    1993-01-01

    Resumo:O presente trabalho foi realizado com o objetivo de estudar a influência do conteúdo protéico da dieta associado ao exercício físico intenso, sobre o metabolismo protéico de ratos adultos. Ratos Wistar machos (90 dias de idade), treinados em esteira rolante e controles (sedentários), foram alimentados com dietas semipurificadas contendo 6% (hipoprotéica), 25% (normoprotéica) e 35% (hiperprotéica)de caseína. Em nossas condições experimentais, verificou-se que os animais do grupo hipopro...

  15. Ractopamina y nivel de proteína de la dieta, respuesta productiva y características de la carcasa de cuyes (Cavia porcellus)

    OpenAIRE

    García Leandro, Madeline Victoria

    2017-01-01

    Universidad Nacional Agraria La Molina. Escuela de Posgrado. Maestría en Nutrición El objetivo del presente trabajo fue determinar el efecto del Clorhidrato de Ractopamina (RAC) y el nivel de proteína de la dieta sobre la respuesta productiva y características de la carcasa de cuyes (Cavia porcellus). Se emplearon 96 cuyes machos de 49 días de edad que se distribuyeron en 24 pozas. Cada poza fue una unidad experimental con cuatro cuyes. Se les administró seis dietas con dos niveles de RAC ...

  16. El uso de granos secos de destilería con solubles (DDGS) en dietas sorgo-soya para pollos de engorda y gallinas de postura

    OpenAIRE

    Arturo Cortes Cuevas; César A. Esparza Carrillo; Gonzalo Sanabria Elizalde; Jorge Miguel Iriarte; Manuel Ornelas Roac; Ernesto Ávila González

    2012-01-01

    Para estudiar el comportamiento productivo en pollos y gallinas con dietas adicionadass con granos secos de destilería con solubles (DDGS), se realizaron dos experimentos. En el primero se emplearon 704 pollos Ross de 1 a 49 días de edad, distribuidos en cuatro tratamientos con ocho repeticiones de 22 pollos cada uno. Se empleó un diseño completamente al azar. Los tratamientos fueron: 1) dieta basal sorgo-soya, T2) como 1+7% DDGS, T3) como 1+14% de DDGS, T4) como 1+21% de DDGS. En el segundo ...

  17. Efecto de los aceites y semillas en dietas para rumiantes sobre el perfil de ácidos grasos de la leche. Revisión

    OpenAIRE

    Andrés L. Martínez Marín; Manuel Pérez Hernández; Luis M. Pérez Alba; Domingo Carrión Pardo; Gustavo Gómez Castro; Ana I. Garzón Sígler

    2013-01-01

    Este trabajo presenta una revisión del efecto de la adición de aceites y semillas ricos en ácidos grasos insaturados, a la dieta de las hembras rumiantes, sobre el contenido de ácidos grasos de la grasa láctea. Cuando se incluyen aceites y semillas en la dieta, los cambios del perfil de ácidos grasos de la leche ocurren en el mismo sentido en vacas, ovejas y cabras. Algunos de los efectos observados son comunes a todos los aceites y semillas con independencia del ácido graso mayoritario que a...

  18. 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.

  19. 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.

  20. 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.

  1. 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.

  2. 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.

  3. 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.

  4. 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.

  5. 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.

  6. 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

  7. 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.

  8. 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...

  9. 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.

  10. 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.

  11. 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.

  12. 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.

  13. 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...

  14. 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...

  15. 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.

  16. 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...

  17. 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.

  18. 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...

  19. 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.

  20. 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.

  1. 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...

  2. 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...

  3. Fatores associados ao consumo de dietas ricas em gordura em adultos de uma cidade no sul do Brasil

    Directory of Open Access Journals (Sweden)

    Airton José Rombaldi

    2014-05-01

    Full Text Available O objetivo deste estudo foi descrever a frequência de consumo de dieta rica em gordura por adultos de 20 a 69 anos de Pelotas, RS, e analisar fatores associados. Foi realizado um estudo transversal de base populacional, incluindo 972 adultos. A frequência do consumo de gordura alimentar no ano anterior à pesquisa foi avaliada pelo questionário de Block, composto por quinze itens alimentares, pontuados de acordo com a frequência de consumo de alimentos com elevados teores de gordura. Cerca de 1/3 da população adulta (32,7% consumia regularmente dieta rica em gordura. Para ambos os sexos, o consumo regular de gordura mostrou-se associado a idades mais jovens e consumo regular de refrigerantes e, somente para homens, aos níveis econômicos A/B. A frequência do consumo regular de alimentos ricos em gordura na população adulta residente no município de Pelotas encontra-se além das recomendações atuais do Ministério da Saúde. Políticas públicas que estimulem uma alimentação saudável são urgentemente necessárias.

  4. Morus alba o Hibiscus rosa-sinensis como sustituto parcial de soya en dietas integrales para conejos

    Directory of Open Access Journals (Sweden)

    P. E. Lara

    2012-01-01

    Full Text Available Los conejos pueden aprovechar los nutrientes contenidos en los forrajes y subproductos agrícolas eficientemente gracias a la fermentación cecal y a la cecotrofía. Los objetivos del presente trabajo fueron: evaluar la tasa de crecimiento y el rendimiento de la canal en conejos alimentados con minibloques de harina de morera (Morus alba o tulipán (Hibiscus rosa-sinensis en sustitución parcial de pasta de soya; y determinar el consumo y digestibilidad de la dieta. Para esto, se utilizaron 18 conejos de 30 días de edad, distribuidos al azar en tres dietas experimentales (n=6, ac (alimento convencional, mbm (minibloque con 30% de morera y, mbt (minibloque con 27% de tulipán, durante nueve semanas. La ganancia diaria y el rendimiento en canal fue mejor (p0.10 en los tres grupos. Es factible sustituir parcialmente la proteína de la soya por harina de hojas de morera o tulipán, aunque presentan una menor respuesta productiva con respecto a la alimentación convencional.

  5. Una propuesta de dieta digital: repensando el consumo mediático en la era de la hiperconectividad

    Directory of Open Access Journals (Sweden)

    Javier SERRANO PUCHE

    2014-03-01

    Full Text Available Uno de los elementos característicos del escenario comunicativo actual es la sobreabundancia informativa. Constituye un rasgo distintivo de nuestra era, junto con la cultura de la velocidad. La creciente implantación de las tecnologías digitales y la generalización entre los ciudadanos de los dispositivos móviles con acceso a Internet han propiciado, por otra parte, que se extienda la idea de que la ‘conectividad total’ es un estado, no sólo técnicamente realizable, sino incluso deseable. Todo ello converge en una situación en la que el ciudadano medio ha de enfrentarse a una ingente cantidad de información. Corre el riesgo de que su consumo mediático derive en “obesidad informativa”, por su incapacidad para digerir tanta información, a menudo de escasa calidad y que le llega de manera incesante. Frente a ello, en esta investigación se defiende la propuesta de adoptar una “dieta digital”. Dentro del marco teórico de la “comunicación slow”, se exponen aquí algunos hábitos interesantes para lograr un buen consumo mediático y se concluye que la ‘dieta digital’ constituye una práctica recomendable en el contexto de la alfabetización mediática.

  6. EFECTO DE DIETAS EN ADULTOS DE Spodoptera cosmioides (LEPIDOPTERA: NOCTUIDAE SOBRE LA FERTILIDAD, FECUNDIDAD Y LONGEVIDAD DEL ADULTO

    Directory of Open Access Journals (Sweden)

    M. C. CURIS

    2017-12-01

    Full Text Available La aparición de cultivares de soja Bt + RR2Y determinó la emergencia de una nueva plaga, Spodoptera cosmioides, una plaga altamente polífaga de amplia distribución. La cría de insectos en cámaras de cría es necesaria para estudios de investigación básica y aplicada. El objetivo del trabajo fue evaluar el efecto de tres dietas ricas en carbohidratos (solución de miel, de jarabe de glucosa y de jarabe de maíz en la alimentación de los adultos y determinar su efecto sobre la fecundidad, fertilidad y supervivencia de S. cosmioides. Se determinó que, si bien no se hallaron diferencias entre los tratamientos, la composición de los  azúcares de las dietas, puede afectar los parámetros reproductivos de esta plaga, ya que las hembras alimentadas con solución de miel natural, más rica en compuestos orgánicos, aumentaron la fecundidad, refl ejado en una mayor puesta y eclosión de huevos y la longevidad de los adultos.

  7. 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.

  8. 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'.

  9. 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'.

  10. Characterization of actinobacteria associated with three ant-plant mutualisms.

    Science.gov (United States)

    Hanshew, Alissa S; McDonald, Bradon R; Díaz Díaz, Carol; Djiéto-Lordon, Champlain; Blatrix, Rumsaïs; Currie, Cameron R

    2015-01-01

    Ant-plant mutualisms are conspicuous and ecologically important components of tropical ecosystems that remain largely unexplored in terms of insect-associated microbial communities. Recent work has revealed that ants in some ant-plant systems cultivate fungi (Chaetothyriales) within their domatia, which are fed to larvae. Using Pseudomyrmex penetrator/Tachigali sp. from French Guiana and Petalomyrmex phylax/Leonardoxa africana and Crematogaster margaritae/Keetia hispida, both from Cameroon, as models, we tested the hypothesis that ant-plant-fungus mutualisms co-occur with culturable Actinobacteria. Using selective media, we isolated 861 putative Actinobacteria from the three systems. All C. margaritae/K. hispida samples had culturable Actinobacteria with a mean of 10.0 colony forming units (CFUs) per sample, while 26 % of P. penetrator/Tachigali samples (mean CFUs 1.3) and 67 % of P. phylax/L. africana samples (mean CFUs 3.6) yielded Actinobacteria. The largest number of CFUs was obtained from P. penetrator workers, P. phylax alates, and C. margaritae pupae. 16S rRNA gene sequencing and phylogenetic analysis revealed the presence of four main clades of Streptomyces and one clade of Nocardioides within these three ant-plant mutualisms. Streptomyces with antifungal properties were isolated from all three systems, suggesting that they could serve as protective symbionts, as found in other insects. In addition, a number of isolates from a clade of Streptomyces associated with P. phylax/L. africana and C. margaritae/K. hispida were capable of degrading cellulose, suggesting that Streptomyces in these systems may serve a nutritional role. Repeated isolation of particular clades of Actinobacteria from two geographically distant locations supports these isolates as residents in ant-plant-fungi niches.

  11. Dieta habitual e fatores de risco para doenças cardiovasculares Habitual diet and cardiovascular disease risk factors

    Directory of Open Access Journals (Sweden)

    Ana Maria Cervato

    1997-06-01

    Full Text Available INTRODUÇÃO: Estudo descritivo por amostragem em munícípio do Estado de São Paulo, Brasil, em 1990, com objetivo de analisar, mediante entrevistas domiciliares, a dieta habitual e fatores de risco para doenças cardiovasculares em indivíduos maiores de 20 anos. METODOLOGIA: Foram entrevistados 557 indivíduos, de idade entre 20 e 88 anos, que fazem parte de subamostra de um estudo global na região. A dieta habitual, identificada pelo histórico alimentar foi comparada às recomendações da OMS e os fatores de risco estudados (obesidade, dislipidemias, diabetes melito diagnosticados pelo Índice de Massa Corpórea e dosagens bioquímicas. RESULTADOS E CONCLUSÕES: Observou-se que 60% da população consome dieta com energia total abaixo da estimativa das necessidades e que a contribuição calórica dos carboidratos foi de 56%, dos lipídios de 29% e das proteínas de 15%. Entretanto, na análise por percentil, a contribuição calórica dos lipídios e das proteínas encontra-se muito acima dos padrões recomendados em detrimento dos carboidratos. A energia, distribuição calórica e quantidade de colesterol foi adequada em apenas 5% das dietas. Dentre os fatores de risco para doenças cardiovasculares estudados observou-se a prevalência de obesidade em 38% dos indivíduos, de dislipidemias em 26% e de diabetes melito em 5%. A atividade física leve preponderante com dieta inadequada, tanto em termos de qualitativos quanto quantitativos, agravam ainda mais esse quadro.INTRODUCTION: A survey by sampling in a county of the State of S. Paulo in 1990 sought, by means of home interviews, to analyse the habitual diet and risk factors for cardiovascular disease of people over 20 years of age. METHODOLOGY: Of the sub-specimen of a comprehensive study population, 557 individuals, aged between 20 and 88, were interviewed. The habitual diet, characterized by the dietary history, was compared with the recommendations on energy and nutrients of the

  12. Mananoligossacarídeo em dietas para larvas de tilápia Mannanoligosaccharides in diets for tilapia larvae

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    Kátia Kalko Schwarz

    2011-12-01

    Full Text Available Este experimento foi realizado para avaliar níveis crescentes de mananoligossacarídeo (MOS na dieta de larvas de tilápias-do-nilo (linhagem Supreme® na fase de reversão sexual durante 30 dias. Larvas de tilápia-do-nilo (n=1500, P=0,01 g ± 0,001 g foram distribuídas aleatoriamente em 30 tanques de 100 litros. Os peixes foram distribuídos em delineamento inteiramente casualizado, composto por seis tratamentos e cinco repetições. A dieta controle (isenta de MOS foi elaborada para conter aproximadamente 35% de proteína bruta e 3.100 kcal de ED/kg. As demais foram suplementadas com 0; 0,15; 0,30; 0,45; 0,60 e 0,75% de MOS em substituição ao milho da dieta controle. Com o aumento nos níveis de MOS nas dietas, foi observado aumento linear sobre o comprimento do intestino, a altura das vilosidades intestinais e a densidade dos vilos. Não houve diferença na composição corporal, no ganho em peso, no peso final, no comprimento final, no fator de condição, na taxa de sobrevivência e no número de células caliciformes do intestino das larvas. Os níveis de MOS tiveram efeito quadrático sobre a conversão alimentar, cujos melhores resultados foram obtidos com 0,34% de MOS. A utilização de MOS no nível de 0,34% em dietas para larvas de tilápia-do-nilo melhora a conversão alimentar e promove aumento do comprimento do intestino, da altura das vilosidades e da densidade de vilos intestinal.This experiment was conducted to evaluate increasing levels of mannanoligosaccharides (MOS in the diet of Nile tilapia larvae (Supreme® at the sex reversal stage for 30 days. Nile tilapia larvae (n = 1500, p = 0.01 ± 0.001 g, were randomly distributed in 30 tanks of 100 liters each, for 30 days. The fish were distributed in a randomized design with six treatments and five replicates. The control diet (no MOS was elaborated to contain approximately 35% of crude protein and 3,100 kcal DE/kg. Mannanoligosaccharides were included in the other diets

  13. Dieta cetogênica no tratamento de epilepsias farmacorresistentes The ketogenic diet on the treatment of drug resistant epilepsies

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    Carla Barbosa Nonino-Borges

    2004-12-01

    Full Text Available A epilepsia é uma condição clínica crônica correspondente a um grupo de doenças que tem em comum crises epilépticas; ela atinge de 0,5% a 1,0% da população dos países desenvolvidos, podendo esta prevalência ser maior nos países em desenvolvimento. Aproximadamente um terço dos pacientes evolui com crises epilépticas intratáveis com medicamentos; em alguns casos, é possível o tratamento cirúrgico. Nos pacientes em que cirurgia não é possível, a dieta cetogênica passa a ser uma opção terapêutica, principalmente em crianças. Espera-se que esta terapia seja eficaz para, pelo menos, um terço dos pacientes, resultando em redução ou controle das crises. No presente trabalho, apresentamos métodos para o preparo e uso a dieta cetogênica. O planejamento da dieta é individualizado, seguindo-se recomendações para o consumo energético e proporções de gorduras, proteínas e carboidratos específicos. Sempre que introduzida a dieta, o paciente deve ser monitorizado, devido à possibilidade de efeitos adversos. A orientação dos pais ou responsáveis sobre a dieta cetogênica, e como ela funciona, proporciona maior aceitação e aderência a esta forma de tratamento da epilepsia.Epilepsy is a chronic condition that affects 0.5% to 1.0% of the population in developed countries. This prevalence may be higher in developing countries. A significant proportion of the patients, nearly one third of them will have their condition evolved into a stage of uncontrolled crises, in some cases, surgical procedure may be indicated. However, for several patients, surgery is not possible. In these cases, ketogenic diet is a therapeutic option, especially for children. It is supposed that nearly one third of the patients that use the ketogenic diet, experience seizure control or reduction in the number of seizures. The current study presents methods of preparing and using ketogenic diet. The diet must be individualized, considering the

  14. Plant genotype shapes ant-aphid interactions: implications for community structure and indirect plant defense.

    Science.gov (United States)

    Mooney, Kailen A; Agrawal, Anurag A

    2008-06-01

    Little is known about the mechanisms by which plant genotype shapes arthropod community structure. In a field experiment, we measured the effects of milkweed (Asclepias syriaca) genotype and ants on milkweed arthropods. Populations of the ant-tended aphid Aphis asclepiadis and the untended aphid Myzocallis asclepiadis varied eight- to 18-fold among milkweed genotypes, depending on aphid species and whether ants were present. There was no milkweed effect on predatory arthropods. Ants increased Aphis abundance 59%, decreased Myzocallis abundance 52%, and decreased predator abundance 56%. Milkweed genotype indirectly influenced ants via direct effects on Aphis and Myzocallis abundance. Milkweed genotype also modified ant-aphid interactions, influencing the number of ants attracted per Aphis and Myzocallis. While ant effects on Myzocallis were consistently negative, effects on Aphis ranged from antagonistic to mutualistic among milkweed genotypes. As a consequence of milkweed effects on ant-aphid interactions, ant abundance varied 13-fold among milkweed genotypes, and monarch caterpillar survival was negatively correlated with genetic variation in ant abundance. We speculate that heritable variation in milkweed phloem sap drives these effects on aphids, ants, and caterpillars. In summary, milkweed exerts genetic control over the interactions between aphids and an ant that provides defense against foliage-feeding caterpillars.

  15. Intrapopulation differences in ant eating in the mountain gorillas of Bwindi Impenetrable National Park, Uganda.

    Science.gov (United States)

    Ganas, Jessica; Robbins, Martha M

    2004-10-01

    Variability in ant eating has been observed in several populations of eastern and western gorillas. We investigated the occurrence of ant (Dorylus sp.) eating in two groups of mountain gorillas (Gorilla beringei beringei) with overlapping home ranges within Bwindi Impenetrable National Park, Uganda from September 2001 to August 2002. We calculated the frequency of ant eating by an indirect method of analyzing fecal samples from silverbacks, adult females, and juveniles. One group consumed ants significantly more often than the other (3.3 vs 17.6% of days sampled). Furthermore, the group that consumed ants more often also consumed them on a seasonal basis (September-February monthly range: 0-8%; March-August monthly range: 30-42.9%). Finally, females and juveniles of this group consumed ants significantly more often than did the silverback (total samples containing ants: silverback, 2.1%; adult female, 13.2%; juvenile, 11.2%). Differences in ant eating between groups are likely due to variability in use of habitats where ants occur (particularly secondary forests). Surveys of ant densities in differing habitats, nutritional analysis of ants, and quantification of the amount of ants in their diets are necessary to understand if ant consumption is due to availability, nutritional value, group traditions, or taste preference.

  16. Five new records of ants (Hymenoptera: Formicidae) from Morocco.

    Science.gov (United States)

    Taheri, Ahmed; Reyes-López, Joaquin L

    2015-01-01

    A recent catalogue of the rich ant fauna of Morocco included 214 species, with later studies adding an additional 12 species. Following recent fieldwork in the north of Morocco, we report five new records for the country (Plagiolepis pygmaea Latreille, 1798, Ponera testacea Emery, 1895, Strumigenys tenuipilis Emery, 1915, Temnothorax pardoi Tinaut, 1987, and Tetramorium parvioculum Guillem & Bensusan, 2009) and we present new data on the distribution and natural history of six additional species. This work brings the total number of ants known from Morocco to 233, taking into account two species which were omitted in the list of Cagniant. © Crown copyright 2015.

  17. Core Business Selection Based on Ant Colony Clustering Algorithm

    Directory of Open Access Journals (Sweden)

    Yu Lan

    2014-01-01

    Full Text Available Core business is the most important business to the enterprise in diversified business. In this paper, we first introduce the definition and characteristics of the core business and then descript the ant colony clustering algorithm. In order to test the effectiveness of the proposed method, Tianjin Port Logistics Development Co., Ltd. is selected as the research object. Based on the current situation of the development of the company, the core business of the company can be acquired by ant colony clustering algorithm. Thus, the results indicate that the proposed method is an effective way to determine the core business for company.

  18. Significance of chemical recognition cues is context dependent in ants

    DEFF Research Database (Denmark)

    Bos, N.; Guerrieri, F.J.; d'Ettorre, P.

    2010-01-01

    signatures, composed primarily of long-chain cuticular hydrocarbons. These signatures are colony specific and allow discrimination between nestmates and non-nestmates. Nevertheless, the mechanisms underlying detection, perception and information processing of chemical signatures are poorly understood. It has...... context, affects aggression against non-nestmates carrying the hydrocarbon profile associated with food. Individual ant workers were able to associate the non-nestmate chemical profile with food. However, conditioned ants were still aggressive when encountering a non-nestmate carrying the odour profile...

  19. Mutualistic fungi control crop diversity in fungus-growing ants

    DEFF Research Database (Denmark)

    Poulsen, Michael; Boomsma, Jacobus J

    2005-01-01

    Leaf-cutting ants rear clonal fungi for food and transmit the fungi from mother to daughter colonies so that symbiont mixing and conflict, which result from competition between genetically different clones, are avoided. Here we show that despite millions of years of predominantly vertical...... transmission, the domesticated fungi actively reject mycelial fragments from neighboring colonies, and that the strength of these reactions are in proportion to the overall genetic difference between these symbionts. Fungal incompatibility compounds remain intact during ant digestion, so that fecal droplets...

  20. Are queen ants inhibited by their own pheromone?

    DEFF Research Database (Denmark)

    Holman, L.; Leroy, C.; Jørgensen, Charlotte

    2013-01-01

    . Communication in social insects is predominantly chemical, and the mechanisms regulating processes such as reproductive division of labor are becoming increasingly well understood. Recently, a queen cuticular hydrocarbon (3-MeC31) that inhibits worker reproduction and aggression was isolated in the ant Lasius...... niger. Here, we find that this pheromone also has a weak negative effect on queen productivity and oogenesis. Because 3-MeC31 is present on both queens and their brood, we suggest that it is used by ants of both castes to adjust their fecundity to the amount of developing brood and the presence of other...

  1. Sperm storage induces an immunity cost in ants

    DEFF Research Database (Denmark)

    Baer, Boris; Armitage, Sophie A O; Boomsma, Jacobus J

    2006-01-01

    Ant queens are among the most long-lived insects known. They mate early in adult life and maintain millions of viable sperm in their sperm storage organ until they die many years later. Because they never re-mate, the reproductive success of queens is ultimately sperm-limited, but it is not known...... what selective forces determine the upper limit to sperm storage. Here we show that sperm storage carries a significant cost of reduced immunity during colony founding. Newly mated queens of the leaf-cutting ant Atta colombica upregulate their immune response shortly after completing their nest burrow...

  2. The search rate of the African weaver ant in cashew

    DEFF Research Database (Denmark)

    Henriksen, Signe; Axelsen, Jørgen Aagaard; Lemming, Katrine Hansen

    2015-01-01

    Oecophylla longinoda is a species of eusocial colony living ants that prey upon other insects to feed their larva. Many of these insects are considered pests. An ecosystem model of the interactions between an O. longinoda colony and its potential prey is under construction by the team behind...... this article, and it is unknown which functional response equations are useful for eusocial insect colonies. We investigated the search rate of O. longinoda using artificial feeding experiments in a Tanzanian cashew (Anacardium occidentale L.) orchard to determine the search efficiency of the ants...

  3. Application of ant colony optimization in NPP classification fault location

    International Nuclear Information System (INIS)

    Xie Chunli; Liu Yongkuo; Xia Hong

    2009-01-01

    Nuclear Power Plant is a highly complex structural system with high safety requirements. Fault location appears to be particularly important to enhance its safety. Ant Colony Optimization is a new type of optimization algorithm, which is used in the fault location and classification of nuclear power plants in this paper. Taking the main coolant system of the first loop as the study object, using VB6.0 programming technology, the NPP fault location system is designed, and is tested against the related data in the literature. Test results show that the ant colony optimization can be used in the accurate classification fault location in the nuclear power plants. (authors)

  4. Sex-specific kleptoparasitic foraging in ant-eating spiders

    DEFF Research Database (Denmark)

    Martisová, Martina; Bilde, T.; Pekar, Stano

    2009-01-01

    . To investigate this hypothesis, we studied the effect of sex and life history stage on the frequency of kleptoparasitism in ant-eating spiders of the genus Zodarion in the field. These spiders use a special capture technique involving a quick attack on an ant that is left unguarded by spiders for several minutes......, providing ample opportunities for kleptoparasitism. We found that adult females consistently hunted actively, while adult males ceased active prey capture and instead engaged in kleptoparasitism. Juvenile spiders were active hunters irrespective of sex. Consistent with an ontogenetic shift in foraging...

  5. Conflict over reproduction in an ant-plant symbiosis: why Allomerus octoarticulatus ants sterilize Cordia nodosa trees.

    Science.gov (United States)

    Frederickson, Megan E

    2009-05-01

    The evolutionary stability of mutualism is thought to depend on how well the fitness interests of partners are aligned. Because most ant-myrmecophyte mutualisms are persistent and horizontally transmitted, partners share an interest in growth but not in reproduction. Resources invested in reproduction are unavailable for growth, giving rise to a conflict of interest between partners. I investigated whether this explains why Allomerus octoarticulatus ants sterilize Cordia nodosa trees. Allomerus octoarticulatus nests in the hollow stem domatia of C. nodosa. Workers protect C. nodosa leaves against herbivores but destroy inflorescences. Using C. nodosa trees with Azteca ants, which do not sterilize their hosts, I cut inflorescences off trees to simulate sterilization by A. octoarticulatus. Sterilized C. nodosa grew faster than control trees, providing evidence for a trade-off between growth and reproduction. Allomerus octoarticulatus manipulates this trade-off to its advantage; sterilized trees produce more domatia and can house larger, more fecund colonies.

  6. Diets based on soybean protein for Mediterranean fruit fly Dietas baseadas em proteína de soja para moscas do Mediterrâneo

    Directory of Open Access Journals (Sweden)

    Raimundo Braga Sobrinho

    2006-04-01

    Full Text Available The objective of this work was to develop suitable and economic diets for mass rearing Mediterranean fruit fly, Ceratitis capitata (Diptera: Tephritidae. Diets containing sugar beet bagase, wheat bran, brewer yeast, and others with wheat bran and palletized soybean protein from Brazil were tested. Diets based on soybean protein have shown promising results regarding pupal recovery, pupal weight and adult emergence. Soybean bagase in the form of pellets with 60% of protein can be a very important substitute for other expensive sources of protein.O objetivo deste trabalho foi desenvolver dietas adequadas e econômicas para a criação massal de moscas de frutas do Mediterrâneo, Ceratitis capitata (Diptera: Tephritidae. Foram testados dietas com bagaço de beterraba açucareira, farelo de trigo, levedura de cerveja e outras dietas de farelo de trigo e proteína de soja prensada brasileira. Dietas compostas por proteína de soja apresentaram resultados positivos de recuperação de pupas, pesos de pupa e emergência de adultos. O bagaço de soja, na forma de pellet com 60% de proteína, pode ser um importante substituto de outras fontes de proteína.

  7. Frecuencia del consumo de alimentos industrializados modernos en la dieta habitual de comunidades mayas de Yucatán, México

    Directory of Open Access Journals (Sweden)

    Odette Pérez Izquierdo

    2012-01-01

    Full Text Available El objetivo del trabajo fue identificar la introducción de alimentos industrializados modernos en la dieta habitual de dos comunidades mayas de Yucatán, México, así como algunos factores que, en la escala comunitaria y la de los hogares, podrían explicar la inclusión. Se trata de un estudio de tipo transversal en el que participaron 51 familias seleccionadas a través de un muestreo sistemático sin reemplazo. La información se obtuvo de una entrevista estructurada que incluyó información de variables socioeconómicas, dieta habitual, frecuencia del consumo de alimentos, actividades productivas, disponibilidad de alimentos y apoyos gubernamentales. Se usaron pruebas estadísticas paramétricas para identificar diferencias entre comunidades y familias respecto al consumo de alimentos industrialzados modernos. Los resultados evidencian el consumo de alimentos industrializados de corte moderno en la dieta habitual de ambas comunidades, sin diferencias significativas en esta escala, pero se registraron diferencias en la escala de los hogares. Se discute el papel de la emigración y los programas sociales en la incorporación de alimentos industrializados modernos en la dieta habitual de los hogares mayas de estas comunidades.

  8. Respuesta clínica en pacientes mexicanos con síndrome de intestino irritable tratados con dieta baja en carbohidratos fermentables (FODMAP

    Directory of Open Access Journals (Sweden)

    N. Pérez y López

    2015-07-01

    Conclusiones: En este primer estudio en población mexicana con SII se observó mejoría significativa de los principales síntomas incluyendo dolor, distensión y flatulencia tras una dieta baja FODMAP.

  9. Succinea peruviana (Gastropoda en la dieta de la lagartija de las Lomas Microlophus tigris (Sauria en la Reserva Nacional de Lachay, Lima, Perú

    Directory of Open Access Journals (Sweden)

    José Pérez Z.

    2013-03-01

    Full Text Available El presente trabajo informa de la presencia del caracol Succinea peruviana en la dieta de la lagartija de las Lomas Microlophus tigris, la misma que habita el mesohábitat de Lomas con árboles en la Reserva Nacional de Lachay. Este es el primer informe del consumo de caracoles por lagartijas del Desierto Costero Peruano

  10. The genomic impact of 100 million years of social evolution in seven ant species

    DEFF Research Database (Denmark)

    Gadau, Jürgen; Helmkampf, Martin; Nygaard, Sanne

    2012-01-01

    Ants (Hymenoptera, Formicidae) represent one of the most successful eusocial taxa in terms of both their geographic distribution and species number. The publication of seven ant genomes within the past year was a quantum leap for socio- and ant genomics. The diversity of social organization in ants...... between social and solitary insects, as well as among ant species. Altogether, these seven ant genomes open exciting new research avenues and opportunities for understanding the genetic basis and regulation of social species, and adaptive complex systems in general....... makes them excellent model organisms to study the evolution of social systems. Comparing the ant genomes with those of the honeybee, a lineage that evolved eusociality independently from ants, and solitary insects suggests that there are significant differences in key aspects of genome organization...

  11. Impact of imidacloprid on new queens of imported fire ants, Solenopsis invicta (Hymenoptera: Formicidae)

    Science.gov (United States)

    Neonicotinoid insecticides are commonly used in managing pest ants, including the imported fire ant, Solenopsis invicta Buren. There is increasing evidence that neonicotinoid insecticides at sublethal concentrations have profound effects on social insects. However, the sublethal effect of neonicot...

  12. O uso do carboidrato antes da atividade física como recurso ergogênico: revisão sistemática

    Directory of Open Access Journals (Sweden)

    Jeniffer dos Santos Fontan

    2015-04-01

    Full Text Available A dieta dos atletas requer aporte energético adequado, sendo a principal fonte energética os carboidratos CHO que são encontrados livremente na corrente sanguínea ou armazenados nos músculos e no fígado. Com base na rotina de treinos e competições, ou mesmo na quantidade exacerbada de energia necessária, é comum a necessidade de suplementação de CHO, seja na forma de bebidas, géis, barras ou balas energéticas, antes, durante ou depois da atividade física. Devido à importância dos CHO foram reunidos estudos que testaram a suplementação com diferentes CHO antes do exercício para aumento da performance. Foram investigados artigos e teses cuja publicação ocorreu a partir de 2006 em bases científicas eletrônicas e banco de teses de faculdades renomadas na área. Os CHO podem ser divididos segundo a quantidade de moléculas que o compõem, as quais também são diferenciadas também por digestão, absorção, viscosidade, dulçor, índice glicêmico IG e oxidação durante a atividade. Comparando-se a taxa de oxidação, foram encontrados melhores resultados quando os CHO ingeridos são de alto teor de IG glicose e sacarose e baixo teor de IG frutose ao se realizar atividade de média a alta intensidade de longa duração. A ingestão de CHO antes do exercício mostrou-se eficiente nos nove estudos analisados, sendo que dois deles apresentaram relevância p < 0,005. Mesmo com a ingestão de CHO com diferentes IG, observou-se melhora, não sendo relatada hipoglicemia de rebote como teorizado na literatura. A suplementação de CHO com a composição e administração apropriadas mostrou-se eficiente para aumento do desempenho físico.

  13. Meta-análise da digestibilidade ileal de aminoácidos e minerais em suínos alimentados com dietas contendo enzimas

    Directory of Open Access Journals (Sweden)

    Cheila Roberta Lehnen

    2011-04-01

    Full Text Available O objetivo deste trabalho foi avaliar, por meio da meta-análise, o efeito da fitase e da xilanase sobre a digestibilidade ileal aparente (DIa de aminoácidos, cálcio e fósforo, em suínos em fase de crescimento. A base de dados consistiu de 21 artigos publicados entre 1998 e 2009, no total de 82 tratamentos e 644 suínos. A meta-análise foi realizada por análise gráfica, de correlação, de variância-covariância. As concentrações de fósforo fítico e as frações fibra em detergente neutro, fibra em detergente ácido e lignina em detergente ácido, nas dietas, apresentaram correlações baixas e negativas com a DIa do cálcio, fósforo e aminoácidos. A adição de fitase às dietas aumentou em 2% a DIa da arginina, em 14% a do cálcio e em 34% a do fósforo. A DIa da arginina, fenilalanina, isoleucina e lisina foi 3,3% superior em suínos alimentados com dietas com xilanase, em relação às dietas sem a enzima. O fósforo fítico e as fibras, nas dietas, reduzem a DIa do cálcio, do fósforo e dos aminoácidos essenciais. O uso de fitase e xilanase, nas dietas, melhora o aproveitamento de cálcio, fósforo e alguns aminoácidos. No entanto, o excesso de cálcio e fósforo nas dietas reduz a ação da fitase sobre a digestibilidade ileal dos nutrientes.

  14. Variables antropométricas, hábitos y dietas alimentarias en adolescentes y jóvenes: diferencias en función del sexo

    Directory of Open Access Journals (Sweden)

    Carmen Maganto

    Full Text Available Resumen El estudio tuvo como objetivo analizar las diferencias entre sexos en variables antropométricas (reales, percibidas y deseadas, en hábitos alimentarios, y en el uso de dietas alimentarias. Los participantes fueron 1.075 adolescentes y jóvenes de 14 a 25 años (49.9 % varones, 50.1 % mujeres. Con un diseño descriptivo y comparativo, se administraron tres instrumentos de evaluación. Los resultados confirman muchas diferencias significativas entre sexos. En variables antropométricas las chicas se perciben más obesas de lo que están y desean estar más delgadas; los chicos se perciben igual o más delgados de lo que están y desean tener un volumen corporal superior. Los chicos desean tener un Índice de Masa Corporal (IMC superior y las chicas inferior. Las chicas obtienen puntuaciones significativamente superiores en hábitos alimentarios, aunque los chicos perciben que tienen una alimentación más equilibrada. Las chicas han realizado más dietas y creen necesitarlas más. Las razones para engordar en los chicos son biológicas y en las chicas hábitos alimentarios inadecuados. Las chicas realizan más dietas tanto saludables como no recomendables. Las razones para comenzar una dieta son en las chicas la imagen corporal y en los chicos ser aceptado por los iguales. El abandono de las dietas los chicos lo atribuyen a la dieta y las chicas a sí mismas. El estudio aporta datos relevantes para el diseño de programas preventivos y/o de tratamiento con adolescentes/jóvenes con problemas alimentarios, bien por alteraciones de la imagen corporal, hábitos alimentarios inadecuados y/o por el uso indebido de dietas alimentarias.

  15. EFECTO DE LA PROPORCIÓN CONCENTRADO / FORRAJE DE LA DIETA, SOBRE LAS POBLACIONES DE BACTERIAS UTILIZADORAS DE HIDRÓGENO DEL RUMEN

    Directory of Open Access Journals (Sweden)

    Alcantar Díaz BE

    2010-07-01

    Full Text Available Las Archae metanogénicas, las bacterias Acetogénicas y Sulfato reductoras son los tres grupos últimos de microorganismos dentro de la cadena de degradación de los sustratos en el ecosistema del rumen y la manipulación del tamaño de estas poblaciones es benéfica para la maximización de la energía en el rumiante. Para evaluar el efecto de dietas con diferente proporción de forraje/concentrado, sobre el número de bacterias utilizadoras de hidrógeno en el rumen in vivo, 16 ovino machos fueron colocados en cajas metabólicas y se alimentaron con cuatro dietas a base forraje de maíz más con- centrado en las proporciones: C20, C40, C60 y C80. El concentrado fue a base de maíz molido, harina de soya y trigo. Se tomaron muestras de contenido del rumen cada dos horas durante 24 horas, para determinar número de bacterias, concentraciones de acetato, propionato, amonio y pH. El número de bacterias se determinó por el método del número más probable. El diseño en cuadro latino fue para evaluar el efecto del factor A=4 dietas, el factor B los tiempos de incubación, el factor C cuatro repeticiones y sus interacciones. La proporción forraje: concentrado de la dieta, muestra diferencia significativas (p<0.001 entre el número de bacterias metanogénicas y acetogénicas y sulfato reductoras. Las dietas C60 y C80, tienen el mayor número de bacterias acetogénicas. El efecto de la dieta y tiempo de fermentación, también presentó diferencias en los valores de acetato (p<0.0006, propionato (p< 0.0001, amonio (p<0.0001 y pH (p<0.0001. La manipulación de la proporción forraje: concentrado de la dieta usada en la alimentación de rumiantes es una estrategia para establecer determinado grupo de bacterias utilizadoras de hidrogeno y las propiedades del ambiente en el rumen.

  16. Avaliação de três cultivares de Panicum maximum Jacq. sob pastejo: composição da dieta, consumo de matéria seca e ganho de peso animal Evaluation of three varieties of Panicum maximum Jacq. under grazing: diet composition, dry matter intake and animal weight gain

    Directory of Open Access Journals (Sweden)

    Patrícia Amarante Brâncio

    2003-10-01

    Full Text Available Três cultivares de Panicum maximum Jacq. submetidos a pastejo rotativo foram avaliados ao longo do ano, antes e após o período de pastejo, quanto à composição botânica e química da dieta, consumo de matéria seca e ganho de peso animal. Os tratamentos constituíram em: 1 cv. Tanzânia + 50 kg/ha de N, 2 cv. Tanzânia + 100 kg/ha de N, 3 cv. Mombaça + 50 kg/ha de N, e 4 cv. Massai + 50 kg/ha de N. As dietas selecionadas pelos animais na cv. Massai tenderam a apresentar os menores valores de digestibilidade e proteína bruta e os maiores de fibra em detergente neutro, enquanto na cv. Mombaça as dietas continham, em geral, maiores teores de sílica. Os animais selecionaram, em média, 92,4% de folhas verdes, independentemente do tratamento e da época de amostragem. Os animais consumiram semelhantes quantidades de forragem nos diversos tratamentos, apresentando, em média, consumos de 1,9; 2,8; 3,4; e 2,3 kgMS/100kgPV, respectivamente, em junho, setembro e novembro de 1998 e março de 1999. Os piores resultados quanto ao ganho de peso por animal foram verificados na cv. Massai, mas, devido a sua alta capacidade de suporte na época chuvosa, superou a cv. Mombaça e cv. Tanzânia + 50 kg/ha de N, em termos de ganho de peso por área. A participação de folhas, a altura do pasto, o teor de proteína bruta da dieta selecionada pelos animais e o tamanho de bocado foram os fatores que mais influenciaram positivamente o ganho de peso animal.Three varieties of Panicum maximum Jacq. were evaluated by measuring the botanical and chemical composition of the diet, and the dry matter intake and weight gain of the animal under rotational grazing, before and after a period of grazing. The treatments were: 1 v. Tanzânia + 50 kg N/ha, 2 v. Tanzânia + 100 kg N/ha, 3 v. Mombaça + 50 kg N/ha, and 4 v. Massai + 50 kg N/ha. Of the diets selected by the animals, v. Massai tended to show lower values for digestibility and crude protein, and higher values

  17. Live and let die: why fighter males of the ant Cardiocondyla kill each other but tolerate their winged rivals

    DEFF Research Database (Denmark)

    Anderson, Carl; Cremer, Sylvia Maria; Heinze, Jürgen

    2003-01-01

    alternative dispersal tactics, ants, Cardiocondyla, ergatoid males, fighting, male dimorphism, toleration......alternative dispersal tactics, ants, Cardiocondyla, ergatoid males, fighting, male dimorphism, toleration...

  18. Olfactory memory established during trophallaxis affects food search behaviour in ants

    OpenAIRE

    Provecho, Y.; Josens, R.

    2009-01-01

    Camponotus mus ants can associate sucrose and odour at the source during successive foraging cycles and use this memory to locate the nectar in the absence of other cues. These ants perform conspicuous trophallactic behaviour during recruitment while foraging for nectar. In this work, we studied whether Camponotus mus ants are able to establish this odour-sucrose association in the social context of trophallaxis and we evaluated this memory in another context previously experienced by the ant...

  19. Individual Rules for Trail Pattern Formation in Argentine Ants (Linepithema humile)

    OpenAIRE

    Perna, Andrea; Granovskiy, Boris; Garnier, Simon; Nicolis, Stamatios C.; Labédan, Marjorie; Theraulaz, Guy; Fourcassié, Vincent; Sumpter, David J. T.

    2012-01-01

    We studied the formation of trail patterns by Argentine ants exploring an empty arena. Using a novel imaging and analysis technique we estimated pheromone concentrations at all spatial positions in the experimental arena and at different times. Then we derived the response function of individual ants to pheromone concentrations by looking at correlations between concentrations and changes in speed or direction of the ants. Ants were found to turn in response to local pheromone concentrations,...

  20. Weight loss and morphometric study of intestinal mucosa in rats after massive intestinal resection: influence of a glutamine-enriched diet Perda de peso e estudo morfométrico da mucosa intestinal de ratos submetidos à ressecção subtotal de intestino delgado: influência do uso de dieta com glutamina

    Directory of Open Access Journals (Sweden)

    Sidney Resende Ribeiro

    2004-01-01

    standard-diet group. CONCLUSIONS: In rats with experimentally produced short-bowel syndrome, glutamine-enrichment of an isonitrogenous test diet was associated with an improved adaptation response by the intestinal mucosa but not reduced weight loss. However, the adaptation response in the group receiving the glutamine-enriched diet was not improved over that for the group fed regular chow.A síndrome do intestino curto é responsável por alterações metabólicas que comprometem o estado nutricional do paciente. A glutamina é nutriente essencial para os enterócitos. OBJETIVOS: Estudou-se o efeito da administração de dieta com glutamina, em ratos submetidos à ressecção subtotal do intestino delgado, avaliando a perda de peso pós-operatória e a morfometria da mucosa intestinal. MÉTODOS: Foram constituídos três grupos de ratos Wistar machos recebendo as seguintes dietas: com glutamina (grupo EG, sem glutamina (grupo EsG, e a dieta padrão do laboratório (grupo ER. A ressecção intestinal foi realizada em todos os animais incluindo-se a válvula íleo-cecal, com remanescente jejunal de apenas 25cm a partir do piloro, anastomosado látero-lateralmente ao cólon ascendente. A diferença entre o peso inicial real e ao final do experimento no 20º dia pós-operatório foi registrada antes do sacrifício. Fragmentos de mucosa do duodeno e jejuno foram colhidos e corados com hematoxilina-eosina. Realizou-se o estudo morfométrico da mucosa intestinal, por meio de sistema digital associado ao microscópio ótico. Mediu-se a altura das vilosidades, a profundidade das criptas e a extensão total da mucosa intestinal. RESULTADOS: A perda de peso entre os três grupos não diferiu estatisticamente. A análise da morfometria da mucosa intestinal mostrou diferença significativa: 1 animais do grupo Enterectomia com Glutamina (EG apresentaram vilosidade duodenal significativamente maior que o grupo EsG (p< 0,05, mas não diferiram do grupo que recebeu dieta padrão do

  1. 9 CFR 381.71 - Condemnation on ante mortem inspection.

    Science.gov (United States)

    2010-01-01

    ... dressed, nor shall they be conveyed into any department of the official establishment where poultry... AGRICULTURE AGENCY ORGANIZATION AND TERMINOLOGY; MANDATORY MEAT AND POULTRY PRODUCTS INSPECTION AND VOLUNTARY INSPECTION AND CERTIFICATION POULTRY PRODUCTS INSPECTION REGULATIONS Ante Mortem Inspection § 381.71...

  2. Application of ant colony optimisation in distribution transformer sizing

    African Journals Online (AJOL)

    This study proposes an optimisation method for transformer sizing in power system using ant colony optimisation and a verification of the process by MATLAB software. The aim is to address the issue of transformer sizing which is a major challenge affecting its effective performance, longevity, huge capital cost and power ...

  3. Formulation des betons autopla~ants : Optimisation du squelette ...

    African Journals Online (AJOL)

    Formulation des betons autopla~ants : Optimisation du squelette granulaire par la methode graphique de Dreux - Gorisse. Fatiha Boumaza - Zeraoulia* & Mourad Behim. Laboratoire Materiaux, Geo - Materiaux et Environnement - Departement de Genie Civil. Universite Badji Mokhtar Annaba - BP 12, 23000 Annaba - ...

  4. Ant and rattan associations in forest of tropical Africa | Sunderland ...

    African Journals Online (AJOL)

    Recent fieldwork aimed at increasing our knowledge of the taxonomy and ecology of African rattans has indicated that there is a significant relationship between these climbing palms and a number of ant species. A closer investigation into this relationship has found that the morphology of rattan palms is particularly ...

  5. Are workers of Atta leafcutter ants capable of reproduction?

    DEFF Research Database (Denmark)

    Dijkstra, Michiel Bendert; Boomsma, Jacobus Jan

    2006-01-01

    ovaries. Workers of Atta leafcutter ants only lay trophic eggs in queenright colonies. Although Atta colonies are commonly kept at universities, museums, and zoos, no reports of worker sons in orphaned colonies exist, suggesting that Atta workers are infertile. To explicitly test this, we created eleven...

  6. Does the afrotropical army ant Dorylus (Anomma) molestus go ...

    African Journals Online (AJOL)

    Swarm-raiding army ants are extremely polyphagous nomadic predators inhabiting tropical forests. They are considered keystone species because their raids can regulate the population dynamics of their prey and because a plethora of both invertebrate and vertebrate species are obligatorily or facultatively associated with ...

  7. Biogeography of Puerto Rican ants: a non-equilibrium case?

    Science.gov (United States)

    J.A. Torres; R.R. Snelling

    1997-01-01

    Ants were studied on Puerto Rico and 44 islands surrounding Puerto Rico. Habitat diversity was the best predictor of the number of species per island and the distributions of species followed a nested subset pattern. The number of extinctions per island was low, approximately 1 to 2 extinctions per island in a period of 18 years, and the rates of colonization seem to...

  8. Recurrent bridgehead effects accelerate global alien ant spread

    Science.gov (United States)

    Cleo Bertelsmeier; Sébastien Ollier; Andrew M. Liebhold; Eckehard G. Brockerhoff; Darren Ward; Laurent Keller

    2018-01-01

    Biological invasions are a major threat to biological diversity, agriculture, and human health. To predict and prevent new invasions, it is crucial to develop a better understanding of the drivers of the invasion process. The analysis of 4,533 border interception events revealed that at least 51 different alien ant species were intercepted at US ports over a period of...

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

    African Journals Online (AJOL)

    Jane

    2010-10-11

    Oct 11, 2010 ... subsequently may form the basis in producing its effective control measure in future. ... persons that may deteriorate into serious health condi- tions. ... with the behavioral ecology of ants (Faucheux et al.,. 2006) ... Basiconic type acts as food and CO2 receptor, trichoids ..... Sex pheromone perception in male.

  10. Energy Efficient Routing in Wireless Sensor Networks based on Ant ...

    African Journals Online (AJOL)

    PROF. O. E. OSUAGWU

    2013-09-01

    Sep 1, 2013 ... improved Ant System and their application in WSN routing process. The simulation results show ... and Mobile ad-hoc networks (MANETs) are inappropriate for ... Dorigo in 1992 in his PhD thesis, the first algorithm was aiming ...

  11. Urban physiology: city ants possess high heat tolerance.

    Directory of Open Access Journals (Sweden)

    Michael J Angilletta

    Full Text Available Urbanization has caused regional increases in temperature that exceed those measured on a global scale, leading to urban heat islands as much as 12 degrees C hotter than their surroundings. Optimality models predict ectotherms in urban areas should tolerate heat better and cold worse than ectotherms in rural areas. We tested these predications by measuring heat and cold tolerances of leaf-cutter ants from South America's largest city (São Paulo, Brazil. Specifically, we compared thermal tolerances of ants from inside and outside of the city. Knock-down resistance and chill-coma recovery were used as indicators of heat and cold tolerances, respectively. Ants from within the city took 20% longer to lose mobility at 42 degrees C than ants from outside the city. Interestingly, greater heat tolerance came at no obvious expense of cold tolerance; hence, our observations only partially support current theory. Our results indicate that thermal tolerances of some organisms can respond to rapid changes in climate. Predictive models should account for acclimatory and evolutionary responses during climate change.

  12. Irving Babbitti humanismi põhijooned / Ants Oras

    Index Scriptorium Estoniae

    Oras, Ants

    2003-01-01

    Varem ilmunud: rmt.: "Kultuuri ja teaduse teilt: mõtteid ja uurimusi Tartu Ülikooli 300-nda mälestusaasta puhuks". Tartu : Loodus, 1932, lk. 144-153 ; Ants Oras, "Irving Babbitt' i humanismi põhijooned: äratrükk koguteosest "Kultuuri ja teaduse teilt"". Tartu, 1932

  13. Ant-egg cataract. An electron microscopic study

    DEFF Research Database (Denmark)

    Schrøder, H D; Nissen, S H

    1979-01-01

    an intermittent growth of the structure. In the ant-eggs, as well as in some areas separate from these, membrane limited cytoplasmic bodies could be seen in many cases, the membranes of which were partly joint and partly separated by an electron dense material. It is suggested that the calcifications seen...

  14. Compass cues used by a nocturnal bull ant, Myrmecia midas.

    Science.gov (United States)

    Freas, Cody A; Narendra, Ajay; Cheng, Ken

    2017-05-01

    Ants use both terrestrial landmarks and celestial cues to navigate to and from their nest location. These cues persist even as light levels drop during the twilight/night. Here, we determined the compass cues used by a nocturnal bull ant, Myrmecia midas , in which the majority of individuals begin foraging during the evening twilight period. Myrmecia midas foragers with vectors of ≤5   m when displaced to unfamiliar locations did not follow the home vector, but instead showed random heading directions. Foragers with larger home vectors (≥10   m) oriented towards the fictive nest, indicating a possible increase in cue strength with vector length. When the ants were displaced locally to create a conflict between the home direction indicated by the path integrator and terrestrial landmarks, foragers oriented using landmark information exclusively and ignored any accumulated home vector regardless of vector length. When the visual landmarks at the local displacement site were blocked, foragers were unable to orient to the nest direction and their heading directions were randomly distributed. Myrmecia midas ants typically nest at the base of the tree and some individuals forage on the same tree. Foragers collected on the nest tree during evening twilight were unable to orient towards the nest after small lateral displacements away from the nest. This suggests the possibility of high tree fidelity and an inability to extrapolate landmark compass cues from information collected on the tree and at the nest site to close displacement sites. © 2017. Published by The Company of Biologists Ltd.

  15. Variability in individual activity bursts improves ant foraging success.

    Science.gov (United States)

    Campos, Daniel; Bartumeus, Frederic; Méndez, Vicenç; Andrade, José S; Espadaler, Xavier

    2016-12-01

    Using experimental and computational methods, we study the role of behavioural variability in activity bursts (or temporal activity patterns) for individual and collective regulation of foraging in A. senilis ants. First, foraging experiments were carried out under special conditions (low densities of ants and food and absence of external cues or stimuli) where individual-based strategies are most prevalent. By using marked individuals and recording all foraging trajectories, we were then able to precisely quantify behavioural variability among individuals. Our main conclusions are that (i) variability of ant trajectories (turning angles, speed, etc.) is low compared with variability of temporal activity profiles, and (ii) this variability seems to be driven by plasticity of individual behaviour through time, rather than the presence of fixed behavioural stereotypes or specialists within the group. The statistical measures obtained from these experimental foraging patterns are then used to build a general agent-based model (ABM) which includes the most relevant properties of ant foraging under natural conditions, including recruitment through pheromone communication. Using the ABM, we are able to provide computational evidence that the characteristics of individual variability observed in our experiments can provide a functional advantage (in terms of foraging success) to the group; thus, we propose the biological basis underpinning our observations. Altogether, our study reveals the potential utility of experiments under simplified (laboratory) conditions for understanding information-gathering in biological systems. © 2016 The Author(s).

  16. Ant Colony Optimization and the Minimum Cut Problem

    DEFF Research Database (Denmark)

    Kötzing, Timo; Lehre, Per Kristian; Neumann, Frank

    2010-01-01

    Ant Colony Optimization (ACO) is a powerful metaheuristic for solving combinatorial optimization problems. With this paper we contribute to the theoretical understanding of this kind of algorithm by investigating the classical minimum cut problem. An ACO algorithm similar to the one that was prov...

  17. Evolutionary transitions in enzyme activity of ant fungus gardens.

    Science.gov (United States)

    De Fine Licht, Henrik H; Schiøtt, Morten; Mueller, Ulrich G; Boomsma, Jacobus J

    2010-07-01

    Fungus-growing (attine) ants and their fungal symbionts passed through several evolutionary transitions during their 50 million year old evolutionary history. The basal attine lineages often shifted between two main cultivar clades, whereas the derived higher-attine lineages maintained 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 toward partial degradation of plant cell walls, reflecting a plesiomorphic state of nondomesticated 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 breakdown of cell walls. The adaptive significance of the lower-attine symbiont shifts remains unclear. One of these shifts was obligate, but digestive advantages remained ambiguous, whereas the other remained facultative despite providing greater digestive efficiency.

  18. An object-oriented model for ex ante accounting information

    NARCIS (Netherlands)

    Verdaasdonk, P.J.A.

    2003-01-01

    Present accounting data models such as the Research-Event-Agent (REA) model merely focus on the modeling of static accounting phenomena. In this paper, it is argued that these models are not able to provide relevant ex ante accounting data for operations management decisions. These decisions require

  19. A model of ant route navigation driven by scene familiarity.

    Directory of Open Access Journals (Sweden)

    Bart Baddeley

    2012-01-01

    Full Text Available In this paper we propose a model of visually guided route navigation in ants that captures the known properties of real behaviour whilst retaining mechanistic simplicity and thus biological plausibility. For an ant, the coupling of movement and viewing direction means that a familiar view specifies a familiar direction of movement. Since the views experienced along a habitual route will be more familiar, route navigation can be re-cast as a search for familiar views. This search can be performed with a simple scanning routine, a behaviour that ants have been observed to perform. We test this proposed route navigation strategy in simulation, by learning a series of routes through visually cluttered environments consisting of objects that are only distinguishable as silhouettes against the sky. In the first instance we determine view familiarity by exhaustive comparison with the set of views experienced during training. In further experiments we train an artificial neural network to perform familiarity discrimination using the training views. Our results indicate that, not only is the approach successful, but also that the routes that are learnt show many of the characteristics of the routes of desert ants. As such, we believe the model represents the only detailed and complete model of insect route guidance to date. What is more, the model provides a general demonstration that visually guided routes can be produced with parsimonious mechanisms that do not specify when or what to learn, nor separate routes into sequences of waypoints.

  20. Rethinking crop-disease management in fungus-growing ants

    NARCIS (Netherlands)

    Boomsma, J.J.; Aanen, D.K.

    2009-01-01

    Ant fungus farming has become a prominent model for studying the evolution of mutualistic cooperation, with recent advances in reconstructing the evolutionary origin and elaborations of the symbiosis (1, 2), discovering additional partners and clarifying their interactions (3, 4), and analyzing

  1. 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.

    2013-01-01

    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. PMID:24223521

  2. Ant-inspired density estimation via random walks.

    Science.gov (United States)

    Musco, Cameron; Su, Hsin-Hao; Lynch, Nancy A

    2017-10-03

    Many ant species use distributed population density estimation in applications ranging from quorum sensing, to task allocation, to appraisal of enemy colony strength. It has been shown that ants estimate local population density by tracking encounter rates: The higher the density, the more often the ants bump into each other. We study distributed density estimation from a theoretical perspective. We prove that a group of anonymous agents randomly walking on a grid are able to estimate their density within a small multiplicative error in few steps by measuring their rates of encounter with other agents. Despite dependencies inherent in the fact that nearby agents may collide repeatedly (and, worse, cannot recognize when this happens), our bound nearly matches what would be required to estimate density by independently sampling grid locations. From a biological perspective, our work helps shed light on how ants and other social insects can obtain relatively accurate density estimates via encounter rates. From a technical perspective, our analysis provides tools for understanding complex dependencies in the collision probabilities of multiple random walks. We bound the strength of these dependencies using local mixing properties of the underlying graph. Our results extend beyond the grid to more general graphs, and we discuss applications to size estimation for social networks, density estimation for robot swarms, and random walk-based sampling for sensor networks.

  3. Ants Oras ja eesti Shakespeare'i-kultuur / Evelin Banhard

    Index Scriptorium Estoniae

    Banhard, Evelin

    2008-01-01

    Artikkel käsitleb Ants Orase rolli William Shakespeare'i pärandi tõlkija ja tutvustajana. Analüüsitakse Orase töid eesti kultuuriajakirjanduses 1920. ja 1930. aastatel ning tema hilisemaid, paguluses kirjutatud arvustusi

  4. INTRODUCTION The tailor or weaver ants of genus Oecophylla ...

    African Journals Online (AJOL)

    smaragdina which is a sister species and ecological equivalent of ... Stability in population of Oecophylla in BSP and PG over 13 years suggests that weaver ant .... between the two years were significant at 95% confidence ..... over time is dependent on the nature of the perturbation. ... longinoda in relation to territorility and.

  5. Dentigerumycin: a bacterial mediator of an ant-fungus symbiosis

    DEFF Research Database (Denmark)

    Oh, Dong-Chan; Poulsen, Michael; Currie, Cameron R

    2009-01-01

    Fungus-growing ants engage in mutualistic associations with both the fungus they cultivate for food and actinobacteria (Pseudonocardia spp.) that produce selective antibiotics to defend that fungus from specialized fungal parasites. We have analyzed one such system at the molecular level and found...

  6. Histologia do fígado de tilápia do Nilo ( Oreochromis niloticus alimentados com dietas contendo silagem biológica de pescado

    Directory of Open Access Journals (Sweden)

    Claucia A. Honorato

    2014-12-01

    Full Text Available Resumo: Este estudo teve como objetivo avaliar as possíveis alterações histopatológicas hepática de tilápias do Nilo alimentadas com dietas contendo silagem biológica de pescado com diferentes concentrações protéicas. Foram utilizados 180 juvenis alimentados com dietas contendo três níveis de proteína (20, 24 and 28% PB, e duas proporções de silagem biológica (¼ e ½ durante 75 dias. Os fragementos de fígado foram fixados em Bouin e inclusos em Histosec®. Posteriorente foram cortados em microtomo com espessura de 2 a 5μm. O método utilizado para coloração foi hematoxilina/eosina e PAS. Os cortes histológicos foram analisados em microscopio de luz. O desarranjo na morfologia do fígado dos peixes alimentados com silagem biológica foi influenciado pelos altos níveis protéicos, e pelo aumento ½ de proporções de proteínas de origem animal das dietas. Foi observado que a variação dos hepatócitos está diretamente ligada com o tipo da dieta fornecida para os peixes. Nos peixes alimentados com as dietas contendo 28% PB, o fígado apresentou desarranjo da estrutura cordonal dos hepatócitos, pontos de necrose e deslocamento do núcleo para periferia. Níveis elevados de silagem biológica de pescado provoca alterações deletérias no fígado. O nível de proteína adequado para manter o desenvolvimento associado à saúde do peixe é de 24%PB.

  7. Dietas artificiais para a criação de larvas e adultos da mosca-das-frutas sul-americana

    Directory of Open Access Journals (Sweden)

    Adrise Medeiros Nunes

    2013-10-01

    Full Text Available O objetivo deste trabalho foi adequar as dietas artificiais para o desenvolvimento dos estágios de larva e adulto da mosca-das-frutas sul-americana (Anastrepha fraterculus. Para o estágio larval, foram testadas as seguintes dietas: D1, original, com 10 g de ágar; D2, modificada, com 3,6 g de ágar; e, D3, modificada, com bagaço seco de cana-de-açúcar. Para os adultos, foram testadas quatro dietas: A, levedura de cerveja + mel (2:1; B, açúcar refinado + extrato de levedura + gérmen de trigo cru (3:1:1; C, extrato de soja + açúcar mascavo + gérmen de trigo cru (3:1:1; e D, levedura seca de cervejaria + mel (2:1. Avaliaram-se os parâmetros biológicos de duração do período ovo-pupa, duração e viabilidade do estágio de pupa, massa média de pupas, razão sexual e duração e viabilidade do período ovo-adulto. O desenvolvimento larval em D1 e D2 foi semelhante e indicou que a criação de larvas pode ser realizada com 1/3 da quantidade de ágar da utilizada em D1. A utilização do bagaço seco de cana-de-açúcar, na dieta artificial, afetou negativamente o desenvolvimento larval. As dietas artificiais com levedura de cerveja + mel e com açúcar refinado + extrato de levedura + gérmen de trigo cru são as mais adequadas para a criação de adultos.

  8. Desenvolvimento pós-embrionário de Cochliomyia macellaria (Fabricius (Diptera: Calliphoridae, criada em duas dietas naturais, sob condições controladas

    Directory of Open Access Journals (Sweden)

    Débora Cardoso

    2012-08-01

    Cochliomyia macellaria tem interese médico e médico veterinário por ser veiculadora de enteropatógenos e causadora de miíase secundária. A busca por dietas com baixo custo que mantenham a qualidade da criação torna-se necessária. Objetivou-se avaliar a dieta moela de frango no desenvolvimento pós-embrionário de C. macellaria, comparada a carne bovina. Quarenta neolarvas (3ª geração foram transferidas para 80g de dieta (quatro repetições/tratamento. Foi registrada a massa corporal das larvas maduras, e estas transferidas para tubos de ensaio e mantidas a T 30ºC dia/28ºC noite, UR 70±10% e 12h de fotofase. As observações foram diárias. Houve diferença significativa entre a massa corporal das larvas criadas na dieta moela de frango (0,067g e carne bovina (0,062g. Não houve diferença significativa entre a duração média em dias do estágio larval (4,00; 4,17, pupal (4,09; 4,04; de neolarva a adulto (8,07 e 8,16, para moela e carne, respectivamente. A viabilidade média larval, pupal e total (> 85% não diferiram estatisticamente pelo teste t de Student, 5% de significância. Não houve desvio da razão sexual e não foi observada anormalidade dos adultos. A dieta moela de frango é uma alternativa eficaz e de baixo custo para criação de C. macellaria em laboratório.

  9. Níveis decrescentes de proteína em dietas suplementadas com complexo enzimático para coelhos em crescimento. 1. Desempenho produtivo

    Directory of Open Access Journals (Sweden)

    Dias J.C.C.A.

    2000-01-01

    Full Text Available Estudou-se o efeito da redução do nível protéico da dieta, com e sem suplementação enzimática, sobre o desempenho produtivo de coelhos em crescimento. Em um delineamento inteiramente ao acaso, utilizaram-se 54 coelhos da raça Nova Zelândia Branco, de ambos os sexos, desmamados aos 35 dias de idade e divididos em cinco grupos (tratamentos, quatro de 11 e um de 10 coelhos. Os tratamentos constituíram-se de dietas calculadas como isoenergéticas e isoaminoacídicas com 17, 16, 15 e 14% de proteína bruta (PB, suplementadas com 0,05% de um complexo enzimático comercial (VegproÒ , com atividade de protease e de celulase, e uma dieta controle com 17% de PB sem adição de complexo enzimático. Os animais submetidos aos tratamentos com 14 e 15% PB apresentaram melhores resultados no ensaio de crescimento, observando-se influência significativa (P<0,05 do teor de PB sobre o peso vivo final, peso vivo final metabólico, ganho de peso diário, consumo diário de dieta, consumo diário de proteína bruta e conversão alimentar. A redução do nível de proteína bruta da dieta para 14% com suplementação enzimática e corrigida quanto aos aminoácidos mais limitantes para os teores recomendados pela literatura não influenciou negativamente as características estudadas.

  10. Uso de óleo essencial de orégano, salinomicina e bacitracina de zinco na dieta de frangos de corte

    Directory of Open Access Journals (Sweden)

    Patricia Maria Meneghetti Pulici

    2014-09-01

    Full Text Available O presente trabalho teve como objetivo avaliar dietas com óleo essencial de orégano, associado ou não com salinomicina, como alternativa à bacitracina de zinco sobre o desempenho zootécnico de frangos de corte. Foram utilizados 600 pintos de um dia de idade, machos, da linhagem Cobb® 500, criados até 42 dias de idade em boxes com cama de casca de arroz providos de comedouros tubulares e bebedouros nipple. O delineamento foi inteiramente casualizado, com seis dietas e 10 repetições de 10 aves cada. As dietas experimentais à base de milho e farelo de soja foram: controle positivo – antibiótico (bacitracina de zinco + 0,05% de anticoccidiano (salinomicina, controle negativo – dieta basal (DB sem aditivos, DB + 0,05% de salinomicina e 0,03% de óleo essencial de orégano (Orego-Stim®, DB + 0,03% de óleo essencial de orégano, DB + 0,05% de salinomicina e 0,05% de óleo essencial de orégano, DB + 0,05% de óleo essencial de orégano. Não foi encontrado efeito da utilização do óleo de orégano até 21 dias no desempenho das aves. Nos demais períodos, aos 35 e 42 dias, o desempenho das aves tratadas com 0,03% de óleo essencial de orégano + salinomicina apresentou resultados semelhantes ao controle positivo, levando à conclusão de que a dose de 0,03% de óleo essencial de orégano + salinomicina pode substituir a bacitracina de zinco + salinomicina em dietas para frangos de corte.

  11. Dieta y disponibilidad de forraje del venado cola blanca Odocoileus virginianus thomasi (Artiodactyla: Cervidae en un campo experimental de Campeche, México

    Directory of Open Access Journals (Sweden)

    Danilo Granados

    2014-08-01

    Full Text Available En Campeche, México no existen estudios de la dieta de Odocoileus virginianus thomasi; a pesar de la existencia de 122 Unidades de Manejo para la Conservación de la Vida Silvestre (UMAS en donde se realiza aprovechamiento del venado cola blanca. Los objetivos del trabajo fueron conocer la composición botánica de la dieta y su cambio estacional, la disponibilidad de forraje, la capacidad de carga y carga animal de O. virginianus thomasi. El trabajo se realizó de octubre 2010 a mayo 2012 en el Campo Experimental del Colegio de Postgraduados en Campeche, México. La composición de la dieta se determinó mediante el análisis de heces de venado y material de referencia con la técnica microhistológica; la disponibilidad de forraje se estimó con el método de Adelaide; la capacidad de carga utilizando la presión de pastoreo y la carga animal considerando el forraje disponible y 35% de eficiencia de utilización. La dieta incluyó 40 especies de 15 familias. La riqueza de especies más alta fue de 29 especies en la época de lluvia; las arbustivas fueron preferidas en las tres épocas del año y las herbáceas en la época de lluvia. La composición de la dieta, disponibilidad de forraje, la capacidad de carga y carga animal variaron a través del año. La capacidad de carga fluctuó entre 0.04 a 1.08 venados/ha.

  12. ANTS AS BIOLOGICAL INDICATORS FOR MONITORING CHANGES IN ARID ENVIRONMENTS: LESSONS FOR MONITORING PROTECTED AREAS

    Science.gov (United States)

    The responses of ant communities to structural change (removal of an invasive were studied in a replicated experiment in a Chihuahuan Desert grassland. The results from sampling of ant communities by pit-fall trapping were validated by mapping ant colonies on the experimental plo...

  13. Advances in Research on the Venom Chemistry of Imported Fire Ants

    Science.gov (United States)

    Workers of the imported fire ants, including red imported fire ants, Solenopsis invicta Buren, black imported fire ants, S. richteri Forel, and their hybrid (S. invicta × S. richteri), are vicious stingers. Since the venomous sting is a significant medical problem to humans, the chemistry of import...

  14. Dispersal for survival: some observations on the trunk ant (Formica truncorum Fabricius)

    NARCIS (Netherlands)

    Mabelis, A.A.; Korczynska, J.

    2001-01-01

    The survival chance of the trunk ant (Formica truncorum) is compared with the survival chance of two other species of red wood ants: F.rufa and F.polyctena. Nest populations of F.truncorum are much smaller than nest populations of the other red wood ant species, which makes the species a weaker

  15. The genome of the fire ant Solenopsis invicta

    DEFF Research Database (Denmark)

    Wurm, Yannick; Wang, John; Riba-Grognuz, Oksana

    2011-01-01

    Ants have evolved very complex societies and are key ecosystem members. Some ants, such as the fire ant Solenopsis invicta, are also major pests. Here, we present a draft genome of S. invicta, assembled from Roche 454 and Illumina sequencing reads obtained from a focal haploid male and his brothe...

  16. The effects of age and social interactions on innate immunity in a leaf-cutting ant

    DEFF Research Database (Denmark)

    Armitage, S.A.O.; Boomsma, J.J.

    2010-01-01

    defence is affected by both age and the short-term presence or absence of nestmates in the leaf-cutting ant Acromyrmex octospinosus. We predicted that older ants would show immune senescence and that group living may result in prophylactic differences in immune defence compared to solitarily kept ants. We...

  17. The effectiveness of weaver ant (Oecophylla smaragdina) biocontrol in Southeast Asian citrus and mango

    DEFF Research Database (Denmark)

    Offenberg, Joachim; Cuc, Nguyen Thi Thu; Wiwatwitaya, Decha

    2013-01-01

    Oecophylla ants may protect tropical plantation crops against pests. Cost-benefit studies comparing ant-based protection with conventional methods are needed to assess whether it is economically viable. Here we contrast profits in ant and chemically protected plots in a Thai and a Vietnamese citrus...

  18. Towards a better understanding of the evolution of specialized parasites of fungus-growing ant crops

    DEFF Research Database (Denmark)

    Yek, Sze Huei; Boomsma, Jacobus Jan; Poulsen, Michael

    2012-01-01

    Fungus-growing ants have interacted and partly coevolved with specialised microfungal parasites of the genus Escovopsis since the origin of ant fungiculture about 50 million years ago. Here, we review the recent progress in understanding the patterns of specificity of this ant-parasite associatio...

  19. Ant-Related Oviposition and Larval Performance in a Myrmecophilous Lycaenid

    Directory of Open Access Journals (Sweden)

    Matthew D. Trager

    2013-01-01

    Full Text Available We experimentally assessed ant-related oviposition and larval performance in the Miami blue butterfly (Cyclargus thomasi bethunebakeri. Ant tending had sex-dependent effects on most measures of larval growth: female larvae generally benefitted from increased tending frequency whereas male larvae were usually unaffected. The larger size of female larvae tended by ants resulted in a substantial predicted increase in lifetime egg production. Oviposition by adult females that were tended by C. floridanus ants as larvae was similar between host plants with or without ants. However, they laid relatively more eggs on plants with ants than did females raised without ants, which laid less than a third of their eggs on plants with ants present. In summary, we found conditional benefits for larvae tended by ants that were not accompanied by oviposition preference for plants with ants present, which is a reasonable result for a system in which ant presence at the time of oviposition is not a reliable indicator of future ant presence. More broadly, our results emphasize the importance of considering the consequences of variation in interspecific interactions, life history traits, and multiple measures of performance when evaluating the costs and benefits of mutualistic relationships.

  20. Drowning out the protection racket: partner manipulation or drought can strengthen ant-plant mutualism.

    Science.gov (United States)

    Denison, R Ford

    2014-07-01

    Two recent reports discuss interactions between plants and ants that defend them from herbivores. Acacia trees provide their ant bodyguards with a diet that reduces their ability to benefit from alternate hosts. Provisioning of ants by Cordia trees during drought may buy insurance against extreme defoliation events, not just average-year benefits. Copyright © 2014 Elsevier Ltd. All rights reserved.

  1. The interplay between scent trails and group-mass recruitment systems in ants

    NARCIS (Netherlands)

    Planque, R.; van den Berg, G.J.B.; Franks, N.R.

    2013-01-01

    Large ant colonies invariably use effective scent trails to guide copious ant numbers to food sources. The success of mass recruitment hinges on the involvement of many colony members to lay powerful trails. However, many ant colonies start off as single queens. How do these same colonies forage

  2. Efetividade da "multimistura" como suplemento de dietas deficientes em vitaminas e/ou minerais na recuperação ponderal de ratos submetidos à desnutrição pós-natal

    OpenAIRE

    Ferreira,Haroldo da Silva; Assunção,Monica Lopes de; França,Adijane Oliveira Santos de; Cardoso,Eliana Paiva Cunha; Moura,Fabiana Andréa

    2005-01-01

    OBJETIVO: Avaliar a efetividade da "multimistura", usada como suplemento de dietas deficientes em vitaminas, deficientes em minerais, ou deficientes em vitaminas e minerais, na recuperação ponderal de ratos desnutridos. MÉTODOS: Após o desmame, 56 ratos Wistar, submetidos à desnutrição pós-natal, foram aleatoriamente distribuídos em 7 grupos diferenciados segundo o tipo de dieta oferecida: controle, dietas deficientes em vitaminas, deficientes em minerais, deficientes em vitaminas e minerais ...

  3. Antioxidantes da dieta como inibidores da nefrotoxicidade induzida pelo antitumoral cisplatina Dietary antioxidants as inhibitors of cisplatin-induced nephrotoxicity

    Directory of Open Access Journals (Sweden)

    Lusânia Maria Greggi Antunes

    2004-03-01

    Full Text Available A cisplatina é uma droga antineoplásica altamente efetiva contra vários tipos de cânceres humanos, tais como tumores do testículo e ovário, câncer da cabeça e pescoço e câncer do pulmão. Entretanto, a nefrotoxicidade é um dos principais efeitos colaterais da terapia com a cisplatina. A gravidade da nefrotoxicidade induzida pela cisplatina está relacionada com a concentração de platina nos rins. As evidências mostram que a nefrotoxicidade induzida pela cisplatina é atribuída ao dano oxidativo resultante da geração de radicais livres, e que a administração de antioxidantes é eficiente na inibição destes efeitos colaterais. Uma abordagem alternativa para proteger os roedores dos efeitos colaterais da cisplatina é o uso de conhecidos antioxidantes da dieta. Alguns estudos têm sido realizados para diminuir a peroxidação lipídica e os efeitos citotóxicos induzidos pela cisplatina, com o emprego de antioxidantes da dieta, tais como, selenito de sódio, vitaminas C e E, curcumina e o carotenóide bixina. Nós sugerimos que aqueles antioxidantes da dieta têm efeito nefroprotetor, e que os mecanismos antioxidantes destes compostos deveriam ser explorados durante a quimioterapia com a cisplatina.Cisplatin is a highly effective antineoplastic drug used against several types of human cancers, such as testicular and ovarian tumors; head and neck; and lung cancer. However, nephrotoxicity is one of the most important side-effects of cisplatin therapy. The severity of cisplatin nephrotoxicity is related to platinum concentration in the kidneys. There is a growing amount of evidence that cisplatin-induced nephrotoxicity is ascribed to oxidative damage resulting from free radical generation and that the administration of antioxidants is efficient in inhibiting these side effects. An alternative approach aiming to protect rodents against cisplatin side-effects is the introduction of known dietary antioxidants. Some studies have been

  4. Dieta de Leptodactylus macrosternum (Amphibia; Anura; Leptodactylidae no Sertão da Paraíba, Brasil

    Directory of Open Access Journals (Sweden)

    Dyego Francisco Silva da Costa

    2016-11-01

    Full Text Available Entender a ecologia alimentar de anuros é essencial para compreender a biologia de vida destes animais. Essas informações fornecem dados necessários sobre seu habitat, morfologia, fisiologia e comportamento. Nesse sentido objetivou-se analisar a dieta de uma população Leptodactylus macrosternum, da fazenda Cajueiro, município de Catolé do Rocha, Sertão paraibano. As coletas ocorreram mensalmente entre os meses de outubro de 2013 e junho de 2014, realizadas por meio de busca ativa auditiva/visual. Em laboratório, verificou- se os conteúdos alimentares até o nível taxonômico de Ordem. Foram identificadas 10 categorias alimentares, sendo sete pertencentes à classe Insecta, duas Arachinida e uma Gasthropoda, além de vegetais e terra/pedra. Os principais itens alimentares na dieta, segundo o Índice de Importância Alimentar, foram Coleoptera e Hymenoptera, seguidos de Odonata, Hemiptera e Orthoptera, não ocorrendo de modo geral modificações significativas no consumo dos itens alimentares. As alterações no consumo dos itens na dieta de L. macrosternum, possivelmente resultam da disponibilidade, associada a variações pluviométricas da região. Diet of Leptodactylus macrosternum (Amphibia Anura: Leptodactylidae in the backlands of Paraiba, BrazilAbstract: Understanding the frogs food ecology is essential to understand the biology of life of these animals. This information provides necessary data on their habitat, morphology, physiology and behavior. In the study we analyzed the diet of a Leptodactylus macrosternum population, of the farm Cajueiro, city of Catolé do Rocha, wilderness region of Paraíba. The gatherings were executed between October of 2013 and June of 2014, by hearing/visual active search. In the laboratory, the food contents were analyzed in the taxonomic categories of Order. Were identified 10 feeding categories, being 7 belonging to the class Insecta, 2 Arachinida, 1 Gasthropoda, in addition to vegetables and

  5. Temperature limits trail following behaviour through pheromone decay in ants

    Science.gov (United States)

    van Oudenhove, Louise; Billoir, Elise; Boulay, Raphaël; Bernstein, Carlos; Cerdá, Xim

    2011-12-01

    In Mediterranean habitats, temperature affects both ant foraging behaviour and community structure. Many studies have shown that dominant species often forage at lower temperature than subordinates. Yet, the factors that constrain dominant species foraging activity in hot environments are still elusive. We used the dominant ant Tapinoma nigerrimum as a model species to test the hypothesis that high temperatures hinder trail following behaviour by accelerating pheromone degradation. First, field observations showed that high temperatures (> 30°C) reduce the foraging activity of T. nigerrimum independently of the daily and seasonal rhythms of this species. Second, we isolated the effect of high temperatures on pheromone trail efficacy from its effect on worker physiology. A marked substrate was heated during 10 min (five temperature treatments from 25°C to 60°C), cooled down to 25°C, and offered in a test choice to workers. At hot temperature treatments (>40°C), workers did not discriminate the previously marked substrate. High temperatures appeared therefore to accelerate pheromone degradation. Third, we assessed the pheromone decay dynamics by a mechanistic model fitted with Bayesian inference. The model predicted ant choice through the evolution of pheromone concentration on trails as a function of both temperature and time since pheromone deposition. Overall, our results highlighted that the effect of high temperatures on recruitment intensity was partly due to pheromone evaporation. In the Mediterranean ant communities, this might affect dominant species relying on chemical recruitment, more than subordinate ant species, less dependent on chemical communication and less sensitive to high temperatures.

  6. Ants can learn to forage on one-way trails.

    Directory of Open Access Journals (Sweden)

    Pedro Leite Ribeiro

    Full Text Available The trails formed by many ant species between nest and food source are two-way roads on which outgoing and returning workers meet and touch each other all along. The way to get back home, after grasping a food load, is to take the same route on which they have arrived from the nest. In many species such trails are chemically marked by pheromones providing orientation cues for the ants to find their way. Other species rely on their vision and use landmarks as cues. We have developed a method to stop foraging ants from shuttling on two-way trails. The only way to forage is to take two separate roads, as they cannot go back on their steps after arriving at the food or at the nest. The condition qualifies as a problem because all their orientation cues -- chemical, visual or any other -- are disrupted, as all of them cannot but lead the ants back to the route on which they arrived. We have found that workers of the leaf-cutting ant Atta sexdens rubropilosa can solve the problem. They could not only find the alternative way, but also used the unidirectional traffic system to forage effectively. We suggest that their ability is an evolutionary consequence of the need to deal with environmental irregularities that cannot be negotiated by means of excessively stereotyped behavior, and that it is but an example of a widespread phenomenon. We also suggest that our method can be adapted to other species, invertebrate and vertebrate, in the study of orientation, memory, perception, learning and communication.

  7. Participacao crescente de produtos ultraprocessados na dieta brasileira (1987-2009

    Directory of Open Access Journals (Sweden)

    Ana Paula Bortoletto Martins

    2013-08-01

    ários. CONCLUSÕES Produtos ultraprocessados apresentam participação crescente na dieta brasileira, evidenciada desde a década de 1980 nas áreas metropolitanas e confirmada para todo o País na década de 2000.

  8. Dieta de Odocoileus virginianus (Artiodactyla: Cervidae en un bosque templado del norte de Oaxaca: México

    Directory of Open Access Journals (Sweden)

    Graciela González

    2012-03-01

    Full Text Available La región de la Sierra Madre de Oaxaca, ubicada al norte del estado de Oaxaca, México, es una zona de ecosistemas con alta actividad forestal; en algunas áreas sus bosques templados son conservados por iniciativas de las comunidades indígenas que ahí habitan. Dentro de estos bosques, se analizó la dieta del venado cola blanca (Odocoileus virginianus en San Miguel Amatlán y Santa Catarina Lachatao entre junio 1998 y agosto 1999. Se utilizó el análisis microhistológico de heces fecales, la observación de rastros de ramoneo en plantas y el análisis de contenidos estomacales. La dieta anual estuvo constituida por 42 especies de 23 familias vegetales. Las familias con el mayor número de especies fueron: Fagaceae, Asteraceae, Ericaceae y Fabaceae. La diversidad de la dieta durante la estación húmeda y seca no presentó diferencias significativas (H’= 0.918 y H’=0.867 respectivamente. El porcentaje de similitud entre ambas temporadas fue de 58%. La diferencia entre la frecuencia de aparición de las especies vegetales fue mayor en la estación húmeda. Del total de especies consumidas, el mayor porcentaje estuvo constituido por las herbáceas. Las especies preferidas a lo largo del año fueron: Sedum dendroideum (herbácea y Satureja macrostema (arbusto. La riqueza de especies en la dieta fue menor a la observada en otras regiones con bosques tropicales y bosques mixtos, pero similar a la obtenida en un bosque tropical seco en Costa Rica y en los bosques de coníferas en Estados Unidos.Odocoileus virginianus diet (Artiodactyla: Cervidae in a temperate forest of Northern Oaxaca, Mexico. The Sierra Madre de Oaxaca region, located in the Northern state of Oaxaca, Mexico, is an area of forest ecosystems subject to high exploitation rates, although in some areas its temperate forests are conserved by indigenous community initiatives that live there. We analyzed the diet of white tailed-deer (Odocoileus virginianus in the localities of

  9. Dieta y hábitos alimenticios de la corvina amarilla Cynoscion albus en el Pacífico ecuatoriano

    OpenAIRE

    Calle Morán, Marcos; Galván Magaña, Felipe

    2017-01-01

    El objetivo de este estudio fue determinar los hábitos alimenticios de la corvina amarilla Cynoscion albus y su relación con el sexo y la época del año. Se colectaron muestras de contenido estomacal de C. albus en el mercado municipal de Bahía de Caráquez para poder analizar las presas que conformaban parte de su dieta, la categorización de dichas especies, así como también la diversidad de las mismas, la amplitud de su nicho trófico, el traslapamiento trófico y el nicho trófico. Se registrar...

  10. Dietas para frangos de corte contendo quirera de arroz Performance of broiler feed with broken rice in diets

    Directory of Open Access Journals (Sweden)

    Berilo de Souza Brum Júnior

    2007-10-01

    Full Text Available O experimento foi realizado para avaliar o uso da quirera de arroz na dieta de frangos de corte. Foram utilizados 240 pintos machos, alojados em galpão, contendo 12 boxes de 2m² de área. Cada box continha comedouro tubular, bebedouro pendular e campânula nos 21 dias iniciais. As aves foram distribuídas em um delineamento inteiramente casualizado, com três tratamentos e quatro repetições, as quais receberam dietas contendo 0, 20 e 40% de inclusão de quirera de arroz. Os dados foram submetidos à análise de regressão e à análise de variância e, quando houve diferença, aplicou-se o teste de Tukey. O ganho de peso, o consumo de ração e a conversão alimentar de 1-21, 1-35 e 1-42 dias (P>0,05 não foram afetados pela substituição do milho por quirera de arroz. A umidade de cama, o índice de eficiência produtivo, o rendimento de carcaça quente, de fígado, coração, coxa, sobre-coxa e peito não apresentaram diferença (P>0,05. No entanto, os rendimentos de moela, bem como a pigmentação da canela e do bico, diminuíram linearmente com o aumento do nível de quirera de arroz na dieta. Conclui-se que a quirera de arroz pode ser incluída nas dieta, substituindo o milho, para frangos de corte.An experiment was carried to evaluate the performance of broilers fed with diferent levels of broken rice. The experiment was conducted with 240 males broilers chicks, Cobb 500, were distributed in floor pens of 2m² each, with one tubular feeder, one pendular drinker, an electrical brooder and on the top of rice hulls. An entirely randomized experimental design was used, with 3 treatments and 4 replicates with 20 birds each, which received, diets containing 0, 20 and 40% of broken rice. Data were submitted to Analisis of regression. Weight gain, feed intake, feed conversion to the1- 21, 1- 35 and 1-42 days of age, litter humidity, carcass, liver, breast, thigh and drumstick yield did not present significant difference. The gizzard and the

  11. Quanto custa para as famílias de baixa renda obterem uma dieta saudável no Brasil?

    Directory of Open Access Journals (Sweden)

    Camila Aparecida Borges

    2015-01-01

    Full Text Available O objetivo do estudo foi identificar o custo necessário para a obtenção de uma dieta saudável no Brasil e analisar o comprometimento dessa prática na renda familiar. Foram utilizados dados da Pesquisa de Orçamentos Familiares de 2008. Aquisições de alimentos foram coletadas durante sete dias em 55.970 domicílios. Dois subconjuntos compostos apenas por famílias de baixa renda (≤ R$ 415,00 per capita/mês e ≤ US$ 1,00 per capita/dia foram analisados. A partir dos alimentos obtidos, foram calculados calorias, despesa com alimentação e o preço médio dos oito grupos alimentares presentes no Guia Brasileiro. Foram comparados os gastos atuais e ideais para os oito grupos. As obtenções excederam às recomendações para feijões, óleos/gorduras, doces, carnes/ovos e não alcançaram as recomendações para frutas, hortaliças, lácteos e cereais. Atingir as recomendações aumentaria os gastos com a alimentação em 58%, para indivíduos de renda/per capita de ≤ US$ 1,00 per capita/dia, e em 39%, para indivíduos com renda ≤ R$ 415,00, e comprometeria em 145% a renda familiar. Brasileiros de menor poder aquisitivo necessitam aumentar a renda para atingir a dieta ideal.

  12. La Misión Salesiana "La Candelaria" y los cambios en la dieta de los selk'nam

    Directory of Open Access Journals (Sweden)

    Casali, Romina

    2007-01-01

    Full Text Available Esta comunicación tiene como objetivo dar a conocer los primeros resultados acerca del análisis de la dieta de los aborígenes Selk’nam que habitaron en la Misión Salesiana ‘La Candelaria’, Río Grande (Tierra del Fuego durante su funcionamiento (1893-1931. Nuestros anteriores estudios señalaron a la tuberculosis como causa de muerte excluyente dentro de la Misión. Por tanto, asumimos la relevancia de evaluar y generar información comparativa, acerca de aspectos de la vida cotidiana, en este caso los cambios dietarios, y su incidencia en la salud de los Selk’nam. Se trata de un abordaje interdisciplinario, en función de la conexión de distintos tipos de evidencia y de una visión totalizadora del proceso de desaparición étnica (intervención de múltiples factores con grado variable de sustento en el contacto interétnico, lo mismo que con un comportamiento sinérgico. Se revistan fuentes etnográficas, etnohistóricas y primarias (registros internos de la Misión. Se entrelazan los datos obtenidos, atendiendo a variables cuanti y cualitativas, lo mismo que a las referencias al ámbito de la Misión, como al exterior. Se formaliza una lectura historiográ- fica, antropológica y biológica. Se vislumbra un claro contraste en el tipo de dieta pre y pos contacto interétnico, lo mismo que una discordancia entre los ámbitos “naturales” y la Misión.

  13. Diferentes niveles de energía metabolizable y aminoácidos azufrados en dietas para gallinas Bovans blancas

    Directory of Open Access Journals (Sweden)

    María de los Ángeles Tepox Pérez

    2012-01-01

    Full Text Available Con el objeto de evaluar el comportamiento productivo de la gallina Bovans blanca de primer ciclo alimentadas con dietas con niveles diferentes de energía metabolizable (EM y de metionina+cistina digestible (AAD, para lograr disminuir el porcentaje de huevo pequeño (<42 g, al inicio de la producción se utilizaron 384 gallinas de 19 semanas de edad. Se usó un diseño completamente al azar, en un arreglo factorial de 4 X 2, donde el primer factor fueron los niveles de EM (2700, 2800, 2900, 3000 Kcal/kg y el segundo factor fue la inclusión de diferentes porcentajes de AAD (0.45, 0.61. Cada tratamiento, contó con cuatro repeticiones de 12 gallinas cada uno. Durante ocho semanas se llevaron registros semanales, del porcentaje de postura, peso promedio del huevo, consumo de alimento; masa de huevo/ave/día y conversión alimenticia; además, se clasificó el huevo de acuerdo al peso. Los resultados obtenidos, no mostraron respuesta a los factores de estudio ni a la interacción entre nivel de EM y AAD, para ninguna de las variables productivas. Se encontró un efecto sobre el consumo de alimento del nivel de energía y aminoácidos azufrados (P<0.05. Se disminuyó el porcentaje de huevo pequeño en los niveles más altos de EM de 2900 y 3000 Kcal/Kg (29.6 y 30.4 % respectivamente. Se incrementó (P<0.05 el porcentaje de huevo grande en 3 % al usar dietas con el nivel de AAD de 0.61 %.

  14. Elevated atmospheric carbon dioxide concentrations promote ant tending of aphids.

    Science.gov (United States)

    Kremer, Jenni M M; Nooten, Sabine S; Cook, James M; Ryalls, James M W; Barton, Craig V M; Johnson, Scott N

    2018-04-27

    Animal mutualisms, which involve beneficial interactions between individuals of different species, are common in nature. Insect-insect mutualism, for example, is widely regarded as a keystone ecological interaction. Some mutualisms are anticipated to be modified by climate change, but the focus has largely been on plant-microbe and plant-animal mutualisms rather than those between animals. Ant-aphid mutualisms, whereby ants tend aphids to harvest their honeydew excretions and, in return, provide protection for the aphids, are widespread. The mutualism is heavily influenced by the quality and quantity of honeydew produced by aphids, which is directly affected by host plant quality. As predicted increases in concentrations of atmospheric carbon dioxide (eCO 2 ) are widely reported to affect plant nutritional chemistry, this may also alter honeydew quality and hence the nature of ant-aphid mutualisms. Using glasshouse chambers and field-based open-top chambers, we determined the effect of eCO 2 on the growth and nutritional quality (foliar amino acids) of lucerne (Medicago sativa). We determined how cowpea aphid (Aphis craccivora) populations and honeydew production were impacted when feeding on such plants and how this affected the tending behaviour of ants (Iridomyrmex sp.). eCO 2 stimulated plant growth but decreased concentrations of foliar amino acids by 29% and 14% on aphid-infested plants and aphid-free plants, respectively. Despite the deterioration in host plant quality under eCO 2 , aphids maintained performance and populations were unchanged by eCO 2 . Aphids induced higher concentrations of amino acids (glutamine, asparagine, glutamic acid and aspartic acid) important for endosymbiont-mediated synthesis of essential amino acids. Aphids feeding under eCO 2 also produced over three times more honeydew than aphids feeding under ambient CO 2 , suggesting they were imbibing more phloem sap at eCO 2 . The frequency of ant tending of aphids more than doubled in

  15. A phylogenetic perspective on the association between ants (Hymenoptera: Formicidae) and black yeasts (Ascomycota: Chaetothyriales).

    Science.gov (United States)

    Vasse, Marie; Voglmayr, Hermann; Mayer, Veronika; Gueidan, Cécile; Nepel, Maximilian; Moreno, Leandro; de Hoog, Sybren; Selosse, Marc-André; McKey, Doyle; Blatrix, Rumsaïs

    2017-03-15

    The frequency and the geographical extent of symbiotic associations between ants and fungi of the order Chaetothyriales have been highlighted only recently. Using a phylogenetic approach based on seven molecular markers, we showed that ant-associated Chaetothyriales are scattered through the phylogeny of this order. There was no clustering according to geographical origin or to the taxonomy of the ant host. However, strains tended to be clustered according to the type of association with ants: strains from ant-made carton and strains from plant cavities occupied by ants ('domatia') rarely clustered together. Defining molecular operational taxonomic units (MOTUs) with an internal transcribed spacer sequence similarity cut-off of 99% revealed that a single MOTU could be composed of strains collected from various ant species and from several continents. Some ant-associated MOTUs also contained strains isolated from habitats other than ant-associated structures. Altogether, our results suggest that the degree of specialization of the interactions between ants and their fungal partners is highly variable. A better knowledge of the ecology of these interactions and a more comprehensive sampling of the fungal order are needed to elucidate the evolutionary history of mutualistic symbioses between ants and Chaetothyriales. © 2017 The Author(s).

  16. Plant-ants feed their host plant, but above all a fungal symbiont to recycle nitrogen.

    Science.gov (United States)

    Defossez, Emmanuel; Djiéto-Lordon, Champlain; McKey, Doyle; Selosse, Marc-André; Blatrix, Rumsaïs

    2011-05-07

    In ant-plant symbioses, plants provide symbiotic ants with food and specialized nesting cavities (called domatia). In many ant-plant symbioses, a fungal patch grows within each domatium. The symbiotic nature of the fungal association has been shown in the ant-plant Leonardoxa africana and its protective mutualist ant Petalomyrmex phylax. To decipher trophic fluxes among the three partners, food enriched in (13)C and (15)N was given to the ants and tracked in the different parts of the symbiosis up to 660 days later. The plant received a small, but significant, amount of nitrogen from the ants. However, the ants fed more intensively the fungus. The pattern of isotope enrichment in the system indicated an ant behaviour that functions specifically to feed the fungus. After 660 days, the introduced nitrogen was still present in the system and homogeneously distributed among ant, plant and fungal compartments, indicating efficient recycling within the symbiosis. Another experiment showed that the plant surface absorbed nutrients (in the form of simple molecules) whether or not it is coated by fungus. Our study provides arguments for a mutualistic status of the fungal associate and a framework for investigating the previously unsuspected complexity of food webs in ant-plant mutualisms.

  17. Heat-induced symmetry breaking in ant (Hymenoptera: Formicidae escape behavior.

    Directory of Open Access Journals (Sweden)

    Yuan-Kai Chung

    Full Text Available The collective egress of social insects is important in dangerous situations such as natural disasters or enemy attacks. Some studies have described the phenomenon of symmetry breaking in ants, with two exits induced by a repellent. However, whether symmetry breaking occurs under high temperature conditions, which are a common abiotic stress, remains unknown. In our study, we deposited a group of Polyrhachis dives ants on a heated platform and counted the number of escaping ants with two identical exits. We discovered that ants asymmetrically escaped through two exits when the temperature of the heated platform was >32.75°C. The degree of asymmetry increased linearly with the temperature of the platform. Furthermore, the higher the temperature of heated platform was, the more ants escaped from the heated platform. However, the number of escaping ants decreased for 3 min when the temperature was higher than the critical thermal limit (39.46°C, which is the threshold for ants to endure high temperature without a loss of performance. Moreover, the ants tended to form small groups to escape from the thermal stress. A preparatory formation of ant grouping was observed before they reached the exit, indicating that the ants actively clustered rather than accidentally gathered at the exits to escape. We suggest that a combination of individual and grouping ants may help to optimize the likelihood of survival during evacuation.

  18. Uni-directional trail sharing by two species of ants a Monte Carlo study

    International Nuclear Information System (INIS)

    Kunduraci, T; Kayacan, O

    2015-01-01

    We study insect traffic, specifically ant traffic on a uni-directional trail which is shared by two species of ants, one of which is ‘good’ at smelling and the other ‘poor’. The two distinct species of ants are placed mixed on the same trail and individuals of both are permitted to make a U-turn when they encounter another ant in front of them. The theoretical scheme for the ant traffic is based on an asymmetric simple exclusion model. The ant traffic on the uni-directional trail is studied as a function of the number of ‘good-smelling’ ants and the evaporation probability of pheromones by keeping the number of ‘poor-smelling ants’ constant during Monte Carlo simulations. (paper)

  19. Ant-mediated effects on spruce litter decomposition, solution chemistry, and microbial activity

    DEFF Research Database (Denmark)

    Stadler, B.; Schramm, Andreas; Kalbitz, K.

    2006-01-01

    the effects of ants and aphid honeydew on litter solution of Norway spruce, microbial enzyme activities, and needle decomposition in a field and greenhouse experiment during summer 2003. In the field, low ant densities had relatively little effects on litter solution 30 cm away from a tree trunk...... and %N were not affected by ants or honeydew. Our results suggest that ants have a distinct and immediate effect on solution composition and microbial activity in the litter layer indicating accelerated litter decay whereas the effect of honeydew was insignificant. Keywords: Ants; Decomposition; Formica......Forest management practices often generate clear-cut patches, which may be colonized by ants not present in the same densities in mature forests. In addition to the associated changes in abiotic conditions ants can initiate processes, which do not occur in old-growth stands. Here, we analyse...

  20. Absence of jamming in ant trails: feedback control of self-propulsion and noise.

    Science.gov (United States)

    Chaudhuri, Debasish; Nagar, Apoorva

    2015-01-01

    We present a model of ant traffic considering individual ants as self-propelled particles undergoing single-file motion on a one-dimensional trail. Recent experiments on unidirectional ant traffic in well-formed natural trails showed that the collective velocity of ants remains approximately unchanged, leading to the absence of jamming even at very high densities [John et al., Phys. Rev. Lett. 102, 108001 (2009)]. Assuming a feedback control mechanism of self-propulsion force generated by each ant using information about the distance from the ant in front, our model captures all the main features observed in the experiment. The distance headway distribution shows a maximum corresponding to separations within clusters. The position of this maximum remains independent of average number density. We find a non-equilibrium first-order transition, with the formation of an infinite cluster at a threshold density where all the ants in the system suddenly become part of a single cluster.