The ultrastructure of Sorubim lima (Teleostei, Siluriformes, Pimelodidae) spermatogenesis: premeiotic and meiotic periods

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dc.contributor.authorQuagio-Grassiotto, I
dc.contributor.authorCarvalho, E. D.
dc.contributor.institutionUniversidade Estadual Paulista (Unesp)
dc.date.accessioned2014-05-20T13:51:28Z
dc.date.available2014-05-20T13:51:28Z
dc.date.issued1999-12-01
dc.description.abstractThe ultrastructure of Sorubim lima spermatogenesis during the premeiotic and meiotic periods was studied. Our observations showed that the germ cells in the cysts are connected by cytoplasmic bridges and the mitotic and meiotic divisions are slightly asynchronous, the first and the last spermatogonial generations differ in the cellular and nuclear volume, nucleolus, chromatin condensation, distribution, size, density, and shape of the mitochondria, presence of 'lamellae anulata', amount and dimension of the 'nuages', and movement of the centrioles. In addition to the nuclear prophase structures, the spermatocyte I shows changes in all other cellular organelles and elongated vesicles appear in the cytoplasm. The accentuated cytoplasmic density and thickened walled vesicles are morphological characteristics that differentiate spermatocytes II from the other germ cells in the cysts of Sorubim lima testis. (C) 1999 Harcourt Publishers Ltd.en
dc.description.affiliationUNESP, Inst Biociencias Botucatu, Dept Morphol, BR-18618000 Botucatu, SP, Brazil
dc.description.affiliationUnespUNESP, Inst Biociencias Botucatu, Dept Morphol, BR-18618000 Botucatu, SP, Brazil
dc.format.extent561-567
dc.identifierhttp://dx.doi.org/10.1054/tice.1999.0068
dc.identifier.citationTissue & Cell. Edinburgh: Churchill Livingstone, v. 31, n. 6, p. 561-567, 1999.
dc.identifier.doi10.1054/tice.1999.0068
dc.identifier.issn0040-8166
dc.identifier.urihttp://hdl.handle.net/11449/18407
dc.identifier.wosWOS:000084724000006
dc.language.isoeng
dc.publisherChurchill Livingstone
dc.relation.ispartofTissue & Cell
dc.relation.ispartofjcr1.438
dc.relation.ispartofsjr0,410
dc.rights.accessRightsAcesso restrito
dc.sourceWeb of Science
dc.subjectS-limapt
dc.subjectteleosteipt
dc.subjectultrastructurept
dc.subjectspermatogenesispt
dc.subjectspermatogoniapt
dc.subjectspermatocytespt
dc.titleThe ultrastructure of Sorubim lima (Teleostei, Siluriformes, Pimelodidae) spermatogenesis: premeiotic and meiotic periodsen
dc.typeArtigo
dcterms.licensehttp://www.elsevier.com/about/open-access/open-access-policies/article-posting-policy
dcterms.rightsHolderChurchill Livingstone
unesp.campusUniversidade Estadual Paulista (Unesp), Instituto de Biociências, Botucatupt

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