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1.
Biol. Res ; 44(2): 119-124, 2011. ilus
Article in English | LILACS | ID: lil-602966

ABSTRACT

The current knowledge about teleost fish egg envelope is summarized. The paper analyzes the organization and deposition process of the protein composition and genes involved in the synthesis of teleost fish egg envelopes and their role in gamete interaction during fertilization. Pelagic and demersal species that our research group is working with are especially considered. The vertebrate ZP family of proteins, the evolution and relationship among the different genes and their expression are taken into account. We consider fish envelope as a possible biomonitor for ecological contaminants. The biotechnological applications for aquaculture and genomic and post-genomic approaches are auspicious.


Subject(s)
Animals , Female , Male , Egg Proteins/analysis , Fishes/physiology , Sperm-Ovum Interactions/physiology , Biomarkers/analysis , Environmental Monitoring , Egg Proteins/genetics , Egg Proteins/ultrastructure , Fishes/genetics , Microscopy, Electron, Transmission , Sperm-Ovum Interactions/genetics
2.
Rev. bras. biol ; 50(2): 523-36, maio 1990. ilus
Article in Spanish | LILACS | ID: lil-92287

ABSTRACT

Realizou-se neste trabalho um estudo histológico do ovário de Macrodon ancylodon, com especial atençäo à ovogênese, aos folículos pós-ovulatórios e à atresia. Na seqüência da maturaçäo ovocitária se evidenciou a existência de 6 tipos celulares: ovogônias, ovócitos basófilos, ovócitos com vitelogênese lipídica, ovócitos com vitelogênese protéica, ovócitos com vitelogênese total e ovócitos hidratados. Os folículos pós-ovulatórios se caracterizaram por estruturas em degeneraçäo. Säo descritos dois tipos de atresia: a hipertrófica e a näo hipertrófica, que aparentemente näo teriam ligaçöes com um possível rol endócrino. As membranas ovulares (teca e granulosa) apresentaram um só tipo celular, sendo negativas as reaçöes histoquímicas para lipídios e colesterol


Subject(s)
Animals , Female , Fishes/anatomy & histology , Follicular Atresia , Oogenesis , Ovary/anatomy & histology
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