Base de dados : LILACS
Pesquisa : A05.360.490.690.700 [Categoria DeCS]
Referências encontradas : 3 [refinar]
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Texto completo SciELO Chile
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Id: lil-591971
Autor: Díaz-Andrade, M C; Galíndez, E J; López-Cazorla, A; Estecondo, S.
Título: Ovarian folliculogenesis in the smallnose fanskate sympterygia bonapartii (Müller & Henle, 1841) (Chondrichthyes, Rajidae) / Foliculogénesis ovárica en la raya marmorada, sympterygia bonapartii (Müller & Henle, 1841) (Chondrichthyes, Rajidae)
Fonte: Int. j. morphol;29(1):174-181, Mar. 2011. ilus.
Idioma: en.
Resumo: Chondrichthyes have become an important economic resource in the last decades, with Argentina as one of the countries that exploits more sharks and skates, even at levels that exceed de limits of many species. However, there is a scarce knowledge of the reproductive biology of this group, particularly from species inhabiting the Southern hemisphere. This work shows the most relevant facts during folliculogenesis in Sympterygia bonapartii. Results show that germinal cells are present in immature and maturing females. The most important facts that vary along de follicular development are the number of types and layers of follicular cells, the establishment of thin projections from the follicular cells and the degree of development of the thecae. Follicular cells are, at least, of two different types and both of them emit projections that break through the zona pellucida. The outer theca shows signs of synthetic activity. Atretic follicles of different sizes are present in exemplars of all the reproductive stages. These results are discussed in a physiological and adaptive context.

Los Condrictios se han convertido en un recurso económico importante en las últimas décadas, siendo Argentina uno de los países que más explota tiburones y rayas, incluso a niveles que exceden los límites de varias especies. A pesar de esto, es poco lo que se conoce sobre la biología reproductiva de este grupo, particularmente en especies del Hemisferio Sur. En este trabajo se estudian los estadios más relevantes de la foliculogénesis en Sympterygia bonapartii. Los resultados muestran que las ovogonias están presentes tanto en ejemplares inmaduros como subadultos. Las características más importantes que varían a lo largo del desarrollo folicular son el número de capas y tipos celulares que constituyen el epitelio folicular, el desarrollo de proyecciones de las células de la granulosa y el grado de desarrollo de las tecas. Las células foliculares son, al menos, de dos tipos y ambos emiten proyecciones que atraviesan la zona pelúcida. La teca externa presenta características compatibles con la actividad sintética. Folículos atrésicos de distintos tamaños están presentes en ejemplares de todos los estadios de madurez sexual. Estos resultados se discuten en un marco fisiológico y adaptativo.
Descritores: Folículo Ovariano/anatomia & histologia
Folículo Ovariano/crescimento & desenvolvimento
Folículo Ovariano/ultraestrutura
Raias/anatomia & histologia
Raias/embriologia
Raias/fisiologia
Reprodução/fisiologia
Reprodução/genética
-Elasmobrânquios/crescimento & desenvolvimento
Elasmobrânquios/embriologia
Oogônios/citologia
Oogônios/crescimento & desenvolvimento
Oogônios/fisiologia
Limites: Animais
Feminino
Responsável: CL1.1 - Biblioteca Central


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Id: lil-384262
Autor: Aldo Ravaglia, M; Maggese, M. C.
Título: Oogenesis in the swamp eel Synbranchus marmoratus (Bloch, 1795) (Teleostei; Synbranchidae). Ovarian anatomy, stages of oocyte development and micropyle structure
Fonte: Biocell;26(3):325-337, Dec. 2002.
Idioma: en.
Resumo: Synbranchus marmoratus (Synbranchidae), commonly known as the swamp eel, is a protogynous diandric teleost fish widely distributed throughout South America. The purpose of this work was to study the ovarian anatomy and to describe oocyte developmental stages in the swamp eel, Synbranchus marmoratus. S. marmoratus has a unique sacular ovary. It is covered by a conspicuous muscular wall, probably involved in an egg-releasing system acting as a peristaltic-like mechanism. The internal ovarian anatomy shows a U-shaped ovarian lamella delimiting a dorsal ovarian lumen. The microscopic study shows evidence of the existence of a germinal epithelium in the inner surface of the lamella, which contains germinal cells, pre-follicular cells and epithelial cells. The complete oogenesis process is divided into four stages: oogonia, primary growth, cortical alveoli and vitellogenesis. Besides, the ovulated oocytes, and atretic structures were described. The structure of the micropyle was studied by scanning electron microscopy (MEB). Near the animal pole the vitelline envelope forms crests that fuse together becoming furrow-like structures with a slightly spiraled direction that converge into the micropyle pit where is located the micropylar canal. Although the sex reversal process of Synbranchids has been subject of many studies, this is the first complete description of the ovarian anatomy and oogenesis.
Descritores: Oogênese
Oócitos/citologia
Ovário/anatomia & histologia
Ovário/citologia
Smegmamorpha
-Microscopia Eletrônica de Varredura
Oócitos/ultraestrutura
Oogônios/citologia
Oogônios/ultraestrutura
Ovário/crescimento & desenvolvimento
Proteínas do Ovo/metabolismo
Smegmamorpha/anatomia & histologia
Smegmamorpha/crescimento & desenvolvimento
Limites: Feminino
Tipo de Publ: Research Support, Non-U.S. Gov't
Responsável: BR1.1 - BIREME


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Texto completo SciELO Brasil
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Id: lil-343068
Autor: Soares, Rodrigo P. P; Turco, Salvatore J.
Título: Lutzomyia longipalpis (Diptera: Psychodidae: Phlebotominae): a review
Fonte: An. acad. bras. ciênc;75(3):301-330, Sept. 2003.
Idioma: en.
Resumo: Lutzomyia longipalpis is the most important vector of AmericanVisceral Leishmaniasis (AVL) due to Leishmania chagasi in the New World. Despite its importance, AVL, a disease primarily of rural areas, has increased its prevalence and became urbanized in some large cities in Brazil and other countries in Latin America. Although the disease is treatable, other control measures include elimination of infected dogs and the use of insecticides to kill the sand flies. A better understanding of vector biology could also account as one more tool for AVL control. A wide variety of papers about L. longipalpis have been published in the recent past years. This review summarizes our current information of this particular sand fly regarding its importance, biology, morphology, pheromones genetics, saliva, gut physiology and parasite interactions
Descritores: Aberrações Cromossômicas
Pareamento Cromossômico
Colubridae
Viperidae
-Oogônios
Espermatogônias
Limites: Animais
Masculino
Feminino
Responsável: BR1.1 - BIREME



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