Morphological Adaptations
Mostrando 25-36 de 62 artigos, teses e dissertações.
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25. Genetic and morphological variability in Neotropical populations of Apis mellifera / Variabilidade genético-morfológica em populações neotropicais de Apis mellifera
Since the release of the African bee Apis mellifera scutellata in Brazil in 1957, Africanized honey bees have been widely studied, though there are still unresolved questions about population variability. We examined the temporal and spatial variability of Apis mellifera populations from Brazil and Panama, using mitochondrial DNA, traditional morphometrics,
Publicado em: 2007
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26. Variação espacial da fotossíntese e de mecanismos de fotoproteção no cafeeiro (Coffea arabica L.) / Photosynthesis and photoprotection mechanisms vary spacially in coffee (Coffea arabica L.)
O comportamento das trocas gasosas, dos parâmetros de fluorescência da clorofila a e do sistema antioxidativo foi estudado em plantas adultas de café arábica cultivadas em campo e orientadas no sentido norte-sul, em Viçosa-MG, objetivando-se identificar potenciais mecanismos de fotoproteção e avaliar como tais mecanismos se ajustariam espacial e diurn
Publicado em: 2006
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27. Histologia, imunohistoquimica e ultra-estrutura do epitelio da uretra pelvica e peniana nas linhagens de ratos albinos UChA e UChB, bebedoras voluntarias de etanol
The extreme use of ethanol causes significant alterations in the urogenital tract, however papers relating the ethanol chronic consumption to the urethral morphology are unknown. The objective of the present paper was to describe the histology, histochemistry, immunohistochemistry and ultrastructure of the urethral epithelium in an ethanol-drinking rat strai
Publicado em: 2004
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28. Crescimento e atividade fotossintetica em duas especies de lianas de uma floresta estacional semidecidual
The lianas are copious in natural and man-made clearings and it appears that these forms of life require high irradiance for development and growth. Lianas are rooted in the soil and use other plants, especially trees as support. Since these plants begin their growth on the forest floor, then ascend to the canopy, they can experience extreme differences in r
Publicado em: 2004
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29. Ultrastructure of Proechinophthirus zumpti (Anoplura, Echinophthiriidae) by scanning electron microscopy
The ultrastructure of Proechinophthirus zumpti Werneck, 1955, mainly the external chorionic features of the egg, is described through electronic microscopy techniques. This species was first cited in Argentina, infesting Arctocephalus australis (Zimmermann, 1873). The morphological adaptations of adults and nymphs are described in both species of Proechinoph
Memórias do Instituto Oswaldo Cruz. Publicado em: 2002-09
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30. Interactions between bees and Ludwigia elegans (Camb.) Hara (Onagraceae) flowers at different altitudes in São Paulo, Brazil
Populations of Ludwigia elegans (Carnb.) Hara were examined in Aluminio (600m) and Campos do Jordão (1520m), in the State of São Paulo. Flowers of both populations are self-incompatible and dependent on bees for pollination. Flowers of Ludwigia elegans at the Aluminio site were visited by about 30 different species of bees, and those at Campos do Jordão b
Revista Brasileira de Zoologia. Publicado em: 2002-09
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31. Ecologia da comunidade aquática de um riacho de 1 ordem da Mata Atlântica: relações entre variáveis estruturais e bióticas em uma reserva de biosfera tropical.
This study was developed in arroio Carvão, a 1 order stream at the Maquiné watershed, in the southern part of Atlantic Rain Forest, Brazil. The headwaters are within the Serra Geral Biological Reserve, a conservation unit that is a regional biodiversity core area of the Atlantic Forest Biosphere Reserve. The research was developed to identify the role of p
Publicado em: 2002
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32. Estudo histologico, histoquimico e morfometrico comparado da pele, das glandulas cutaneas e das glandulas cutaneas sexualmente dimorficas de tres especies de anfibios anuros
The skin, the cutaneous glands and the sexually dimorphie skin glands (SDSG) of the species Cycloramphus dubius, Scinax hiemalis and Phyllomedusa burmeisteri were comparatively studied by means of histological, histochemical and morphometrie procedures. The focus of attention of this work was centered on the sexually dimorphie skin glands with the aim to est
Publicado em: 1998
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33. Processos adaptativos do tecido muscular esqueletico e tecido conjuntivo : repercussões sobre a flexibilidade
This study has as its objective to discuss the control mechanisms of structural adaptations in the connective and muscular tissues under different functional conditions. It consists in the development of the interpretations about the plasticity of the tissues related to physical activities in order to improve the motor system s flexibility. Therefore, this b
Publicado em: 1997
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34. Placental efficiency and adaptation: endocrine regulation
Size at birth is critical in determining life expectancy and is dependent primarily on the placental supply of nutrients. However, the fetus is not just a passive recipient of nutrients from the placenta. It exerts a significant acquisitive drive for nutrients, which acts through morphological and functional adaptations in the placenta, particularly when the
Blackwell Science Inc.
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35. The joints of the evolving foot. Part I. The ankle joint.
Evidence is presented to suggest that the eutherian ankle joint has been derived from a meniscus-containing joint such as that found in extant arboreal marsupials. Probable morphological derivatives of this meniscus are identifiable in the Eutheria. The form and function of the joint are described in sub-human Primates and the adaptations which characterize
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36. Membrane ultrastructure of alkaliphilic Bacillus species studied by rapid-freeze electron microscopy.
Cells of Bacillus firmus OF4 and Bacillus alcalophilus were examined by rapid-freeze freeze-fracture and freeze-substitution electron microscopy. No special vesicular structures linked to growth at alkaline pH were found, either within or associated with the cytoplasmic membrane. The cytoplasmic membranes of the alkaliphilic bacilli and the neutrophilic Baci