Competition Biology
Mostrando 13-24 de 34 artigos, teses e dissertações.
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13. Biologia reprodutiva da tainha Mugil liza Valenciennes e do Parati Mugil curema Valencienns (Actinopterygii, Mugilidae) na Baia de Sepetiba, RJ, Brasil
The reproductive biology of the mullets Mugil curema and Mugil liza was determined mainly by observing gonad development, size at maturation and fecundity. The objective of this study was to learn about the strategies developed by these species to maintain their exploited populations in an increasingly altered system. It was hypothesized that there are diffe
Publicado em: 2009
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14. Contribuições da história e filosofia da ciência para o ensino da evolução biológica
The present study has as its most important goal to identify and discuss aspects in relationship to the comphrension of Biological Evolution. The presentation of subject has been distorted and the public, in general, has had influences on its understanding. Some authors made researches on the understanding of such subject with some students of High School, i
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 30/07/2008
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15. Reproductive biology of the harvestman Acutisoma proximum (Arachnida: Opiliones) : alternatives mating strategies among males and maternal care / Biologia reprodutiva do opilião Acutisoma proximum (Arachnida: Opiliones) : estrategias alternativas de acasalamento em machos e cuidado parental em femeas
Not informed
Publicado em: 2008
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16. Ecologia e estrutura social do veado-campeiro (Ozotoceros bezoarticus) no Pantanal
The pampas deer, Ozotoceros bezoarticus L 1758 is a medium sized cervid, whose original range comprised all natural grasslands of eastern South America between 5 and 40 S. This wide range has been severely reduced by habitat loss and fragmentation, hunting, and competition with cattle. Most information about this species concentrates on popul
Publicado em: 2008
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17. SOIL PHYSICAL AND BIOLOGICAL CHARACTERIZATION AFTER HERBICIDES APPLICATION IN BLACK WATTLE (Acacia mearnsii De Wild.) STANDS IN RIO GRANDE DO SUL / CARACTERIZAÇÃO FÍSICA E BIOLÓGICA DO SOLO APÓS APLICAÇÃO DE HERBICIDAS EM PLANTIOS DE ACÁCIA-NEGRA (Acacia mearnsii De Wild.) NO RIO GRANDE DO SUL
The study of soil quality biological indicators in areas classified as forest production units is important to understand the ecological processes that occur in these systems. Monitoring the soil fauna in modified environments, when management practices involve chemical products in the environment, is an instrument that allows to evaluate not only the soil q
Publicado em: 2008
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18. Biological characteristics and herbicide susceptibility of five weed species of the Amaranthus genus. / Características biológicas e suscetibilidade a herbicidas de cinco espécies de plantas daninhas do gênero Amaranthus
Plant species classified in the Aramanthus genus are frequently found infesting brazilian agricultural areas, although there are few researches that evaluated the biological characteristics and the control of these species. Therefore, this work was conducted with the objective of analyzing the germination, the growth and the development, estimating the leaf
Publicado em: 2007
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19. Ecologia trófica da comunidade de peixes do reservatório do Lobo (Broa), Brotas-Itirapina/SP, com ênfase à introdução recente da espécie alóctone Cichla kelberi (Perciformes, Cichlidae).
The introduction of predatory species has carrying deep modifications on the original fish wildlife structure at aquatic environments. The feeding spectrum characterization of fish community from Lobo Reservoir (Broa), beside providing information about the species biology and establishing trophic guilds, made possible the follow-up of trophic alterations du
Publicado em: 2007
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20. Interações entre plantas e beija-flores numa comunidade de Floresta Atlantica Montana em Itatiaia, Rio de Janeiro
Studies of plant-pollinator interactions in vegetation communities can contribute to an understanding of evolutionary and ecological questions. This study sought to relate floristic composition, floral features, resource availability and hummingbird visitation in an ornithophilous assemblage in southeastern Brazil. During two years, data on life form, habita
Publicado em: 2006
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21. Biologia da polinização e reprodutiva de sete especies de Convolvulaceae na caatinga do sertão de Pernambuco
The present work deals with the study of floral phenology/biology and reproduction system of seven species of Convolvulaceae, occurring at Fazenda Catalunha, municipality of Santa Maria da Boa Vista (PE) in the "caatinga" vegetation of the so ealled "sertão Pernambucano". The study was conducted from March 1995 to July 1997. The species considered were: Jac
Publicado em: 1998
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22. Male–male competition magnifies inbreeding depression in wild house mice
The detrimental effects of inbreeding on vertebrates are well documented for early stages of the life cycle in the laboratory. However, the consequences of inbreeding on long-term survival and reproductive success (Darwinian fitness) are uncertain for vertebrates in the wild. Here, we report direct experimental evidence for vertebrates that competition incre
The National Academy of Sciences.
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23. A model for reading morphogenetic gradients: autocatalysis and competition at the gene level.
How are morphogenetic gradients interpreted in terms of embryonic gene transcription patterns within a syncytium such as the Drosophila blastoderm? We propose a hypothetical model based on recent findings in the molecular biology of transcription factors. The model postulates a morphogen which is itself a spatially distributed transcription factor M or which
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24. Differentiation-enhanced binding of the amino-terminal fragment of human urokinase plasminogen activator to a specific receptor on U937 monocytes.
The purified amino-terminal fragment (ATF) of human urokinase plasminogen activator (residues 1-135), which is not required for activation of plasminogen, binds with high affinity to specific plasma membrane receptors on U937 monocytes. Intact urokinase efficiently competes for 125I-labeled ATF binding; 50% competition occurs with 1 nM urokinase. A large par