Chromatoid Body
Mostrando 1-6 de 6 artigos, teses e dissertações.
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1. Nucleolar activity during spermatogenesis of the cattle (Bos indicus) / Atividade nucleolar durante a espermatogenese de bovinos (Bos indicus)
A espermatogenese é um processo muito importante para a predição de fertilidade na pecuária moderna. Muitos aspectos desse processo tem sido estudados, inclusive as várias estruturas celulares, como o nucléolo. Sabe-se que, durante a divisão celular, o nucléolo se desorganiza, reorganizando-se apenas no final da telófase. O presente estudo teve como
Publicado em: 2007
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2. Intercellular Organelle Traffic through Cytoplasmic Bridges in Early Spermatids of the Rat: Mechanisms of Haploid Gene Product SharingV⃞
Stable cytoplasmic bridges (or ring canals) connecting the clone of spermatids are assumed to facilitate the sharing of haploid gene products and synchronous development of the cells. We have visualized these cytoplasmic bridges under phase-contrast optics and recorded the sharing of cytoplasmic material between the spermatids by a digital time-lapse ima
The American Society for Cell Biology.
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3. Ultrastructural studies on the differentiation of spermatids in the domestic fowl.
Four phases of spermatid maturation are recognized on the basis of nuclear morphology. The formation of the acrosome, perforatorium and axial filament complex are described in relation to these phases. The functional significance of the microtubular systems in nuclear elongation and spermatid curvature are discussed. A membranous structure, hitherto unidenti
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4. Centriole development and formation of the flagellum during spermiogenesis in the ostrich (Struthio camelus).
The formation and development of the ostrich sperm tail follows the general pattern described for vertebrate sperm but differs in a number of important aspects when compared with other nonpasserine birds. Midpiece formation is characterised by the development of a long (3 microns) distal centriole which determines the length of the midpiece. The distal centr
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5. Presence of ribonucleoproteins and basic proteins in the nuage and intermitochondrial bars of human spermatogonia.
Ultrastructural cytochemical study of the nuage in the human adult testis revealed that this structure was a cytoplasmic fine fibrillar electron-dense mass, similar to the chromatoid body of spermatids, in all spermatogonial types and spermatocytes. The nuage was often observed in relation with the nucleus or mitochondria. Cytochemical techniques showed stai
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6. Gonadotropin-regulated testicular RNA helicase (GRTH/Ddx25) is essential for spermatid development and completion of spermatogenesis
Gonadotropin-regulated testicular RNA helicase (GRTH/Ddx25), a member of the DEAD-box protein family, is a testis-specific gonadotropin-regulated RNA helicase that is present in Leydig cells and germ cells (meiotic spermatocytes and spermatids). In this study, we observed that GRTH is present in the nucleus, cytoplasm and chromatoid body of germ cells, and i
National Academy of Sciences.