Vitellogenesis
Mostrando 13-24 de 45 artigos, teses e dissertações.
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13. Reproductive biology of Echinanthera cyanopleura (Serpentes: Dipsadidae) in southern Brazil
The reproductive cycles of snakes can be influenced by many factors, both biotic and abiotic, and information about these factors can contribute significantly to knowledge of the biology of many species. Here, we present data on the reproductive biology (body size, sexual dimorphism and female reproductive cycle) of the forest-dwelling colubrid Echinanthera
Zoologia (Curitiba). Publicado em: 2010-02
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14. Culex quinquefasciatus vitellogenesis / Vitelogênese do mosquito Culex quinquefasciatus
Como em outros mosquitos, os trofócitos do corpo gorduroso de Cx. quinquefasciatus sintetizam vitelogenina (Vg), principal proteína armazenada pelo ovócito, formada por duas subunidades de 200 e 86 kDa. A ultraestrutura dos trofócitos revela o rápido desenvolvimento da maquinaria biossintética após a alimentação com sangue (aa) e a consecutiva degra
Publicado em: 2010
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15. Reproductive biology of the swamp racer Mastigodryas bifossatus (Serpentes: Colubridae) in subtropical Brazil
The swamp racer Mastigodryas bifossatus (Raddi, 1820) is a large snake of Colubrinae. It is widely distributed in open areas throughout South America. Dissection of 224 specimens of this species housed in herpetological collections of the southern Brazilian states of Rio Grande do Sul, Santa Catarina and Paraná provided information on its sexual dimorphism,
Zoologia (Curitiba). Publicado em: 2009-03
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16. Functional redundancy in the post-translational processing of the vitellogenin VIT-6 precursor by Caenorhabditis elegans proprotein convertases. / Evidências de redundância funcional entre as pró-hormônio convertases no processamento pós-traducional do precursor da vitelogenina VIT-6 do nematóide Caenorhabditis elegans.
Caenorhabditis elegans possui quatro genes de kpcs (kex2/subtilisin-like proprotein convertases): kpc-1, kpc-2/egl-3, kpc-3/aex-5, kpc-4/bli-4. Em C. elegans, dois dos quatro polipeptídeos de vitelogenina encontrados dentro dos ovócitos, YP115 e YP88, se originam a partir de um precursor polipeptídico (VIT-6) clivado pós-traducionalmente após o motivo R
Publicado em: 2009
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17. 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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18. Radiographic, ultrasound and endocrine evaluation of the reproductive cycle in red-foot tortoises (Geochelone carbonaria, SPIX, 1824) and yellow-foot tortoises (Geochelone denticulata, Lineu, 1766) / Avaliação radiográfica, ultrassonográfica e endócrina do ciclo reprodutivo de jabutis-piranga (Geochelone carbonaria, SPIX, 1824) e jabutis-tinga (Geochelone denticulata, Lineu, 1766)
The main objective of this study was to evaluate the reproductive cycle of red-foot (Geochelone carbonaria, SPIX, 1824) and yellow-foot tortoises (Geochelone denticulata, Lineu, 1766) using minimally invasive clinical and laboratory methods, such as radiographic and ultrasound images and hormone dosages. Seven G. carbonaria and 5 G. denticulata healthy femal
Publicado em: 2009
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19. Ecologia alimentar e reprodutiva de duas espécies de Tropidodryas (Serpentes, Colubridae) da Mata Atlântica / Diet and reproduction of two snakes of the genus Tropidodryas (Serpentes, Colubridae) from the Atlantic Forest
Morphology, diet, habitat use, seasonal activity and reproductive biology were analyzed and compared between Tropidodryas serra and T. striaticeps along their geographical distribution in the Atlantic Forest. The distribution of these sister species do not overlap in most of their range, T. serra have its distribution in lower altitude areaswhile T. striatic
Publicado em: 2008
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20. Estudo dos efeitos da infecção por Plasmodium gallinaceum em processos fisiológicos de Aedes aegypti. / Effects on physiological processes in Plasmodium gallinaceum infected Aedes aegypti.
Insect disease vectors show decreased fecundity when infected with Plasmodium. This phenomenon has already been demonstrated in laboratory models such as Aedes aegypti, Anopheles gambiae and Anopheles stephensi . Some physiological processes of Aedes aegypti suffer changes when the vector is infected with Plasmodium gallinaceum . The ecdysone (20-hidroxyecdy
Publicado em: 2007
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21. Caracterização dos ovarios e do desenvolvimento ovocitario, e da recuperação ovariana pos-parto do platy (Xiphophorus maculatus) (Teleostei, Poeciliidae) em condições laboratoriais controladas e sob ação do hormonio de crescimento
The platy Xiphophorus maculatus (Poeciliidae), is an ornamental freshwater fish, ovoviviparous and able to produce offspring throughout the year, when maintained at the ideal temperature and photoperiod. This fish is considered a promising species for wide scale production and easily adaptable to laboratory conditions. It presents internal fertilization, spe
Publicado em: 2004
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22. Dynamics and cytochemistry of oogenesis in Leporinus striatus Kner (Teleostei, Characiformes, Anostomidae) from the Rio Sapucaí, Minas Gerais State, Brazil
Oogenesis involves a sequense of transformations which are undergone by female germ cells. These cells change into oogonias and then into mature oocytes. Sexually mature females were collected monthly, during one year, from the Rio Sapucaí, tributary of the Rio Grande, which is part of the Furnas Reservoir system in the state of Minas Gerais. The observed m
Revista Brasileira de Zoologia. Publicado em: 2001-12
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23. Dynamics and cytochemistry of oogenesis in Astyanax fasciatus (Cuvier) (Teleostei, Characiformes, Characidae) from Rio Sapucaí, Minas Gerais State, Brazil
Oogenesis involves a set of transformations which are undergone by female germ cells These cells change into oogonias and then into mature oocytes. Sexually mature female fish were collected monthly, during one year, from the Sapucaí River, a tributary of the Rio Grande, which is part of the Furnas Reservoir in the state of Minas Gerais. During the several
Revista Brasileira de Zoologia. Publicado em: 2001-12
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24. Desenvolvimento nuclear de celulas troficas ovarianas de Chrysomys putoria (Diptera, Calliphoridae)
The nuclei of proximal nurse cells of the ovary of Chrysomya putoria in the different stages of ovarian development were examined in preparations submitted to the Feulgen reaction. The objective was to follow the chromatin/chromosomal alterations occurring during the development of those cells involved in the process of egg formation. The most marked alterat
Publicado em: 1988