Results 161 to 170 of about 10,170 (214)
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Duration of meiosis and spermiogenesis in the dog
Canadian Journal of Genetics and Cytology, 1983The duration of meiosis and spermiogenesis was studied in the dog by following the kinetics of [3H]thymidine-labeled canine spermatocytes autoradiographically. Leptotene appears to last for at least 4.20 days, zygotene for less than a day, and pachytene for about 15.50 days. The transition from diplotene to metaphase II is extremely rapid and requires
S K, Ghosal +5 more
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Selenium in mammalian spermiogenesis
bchm, 2007Abstract The role of selenium in male fertility is reviewed with special emphasis on selenoprotein P and phospholipid hydroperoxide glutathione peroxidase (GPx4) in spermiogenesis. Inverse genetics reveal that selenoprotein P is required for selenium supply to the testis. GPx4 is abundantly synthesized in spermatids.
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2009
One of the most dramatic chromatin remodeling and genome reorganization ever observed takes place during the post-meiotic maturation of male germ cells. Indeed, after meiosis, early male haploid cells, or spermatids, inherit a somatic-like chromatin-based genome organization.
Sophie Rousseaux, Myriam Ferro
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One of the most dramatic chromatin remodeling and genome reorganization ever observed takes place during the post-meiotic maturation of male germ cells. Indeed, after meiosis, early male haploid cells, or spermatids, inherit a somatic-like chromatin-based genome organization.
Sophie Rousseaux, Myriam Ferro
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Spermiogenesis in hibernating golden hamsters
Experientia, 1967Wahrend einer Periode von Dezember bis Marz wurden von Goldhamstern im Winterschlaf und gleichzeitig von Kontrolltieren, die bei Zimmertemperatur gehalten wurden, die linken Testes untersucht. Aus der Korrelation zwischen dem histologischen Bild und dem relativen Organgewicht ging hervor, dass der Winterschlaf keinen Einfluss auf die Proliferation der ...
J H, Smit-Vis, M A, Akkerman-Bellaart
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Microtubules and Spermiogenesis
1983Numerous works on spermiogenesis did not focus on the occurence of microtubules. They have been conducted before the first use of glutaraldehyde as fixative agent or in very archaic phylla such as spongia (54) or in species with so scarce microtubules that they remain hidden to the observer sagacity.
J. L. Courtens, B. Delaleu, M. Loir
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Membranous tubes in pseudoscorpion spermiogenesis
Tissue and Cell, 1989The highly complicated differentiation of the spermatid in the pseudoscorpion Diplotemnus sp. is accomplished without the presence of microtubules. Instead membranous tubes measuring approximately 50 nm in diameter and closely associated with endoplasmic reticulum are found from early to mid spermatids. The lumen of the tube is devoid of electron dense
G, Werner, S R, Bawa
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Acrosome Formation in Bandicoot Spermiogenesis
Nature, 1956THERE has been some disagreement about the presence of an acrosome in marsupial spermatozoa. Students of spermiogenesis1 are generally agreed that none is present, whereas Retzius2 found a diminutive body at the proximal end of the mature sperm head in some species, although not in Didelphys 3.
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1987
The two maturation divisions of each spermatocyte result in four haploid cells, spermatids. These differentiate into spermatozoa, a process called spermiogenesis which ends when the spermatozoa are released from the seminiferous epithelium. After the haploid round spermatids are formed, their nuclear and cytoplasmic components undergo a complex series ...
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The two maturation divisions of each spermatocyte result in four haploid cells, spermatids. These differentiate into spermatozoa, a process called spermiogenesis which ends when the spermatozoa are released from the seminiferous epithelium. After the haploid round spermatids are formed, their nuclear and cytoplasmic components undergo a complex series ...
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Nuclear basic proteins in spermiogenesis
Biochimie, 1998In animal species, spermiogenesis, the late stage of spermatogenesis, is characterized by a dramatic remodelling of chromatin which involves morphological changes and various modifications in the nature of the nuclear basic proteins. According to the evolution of species, three situations can be observed: a) persistence of somatic histones or ...
D, Wouters-Tyrou +3 more
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Spermiogenesis ofLacerta vivipara
Journal of Ultrastructure Research, 1985Abstract To the common aspects of spermiogenesis in Reptilia, several new organelles are described in the lizard. One or two nuclear pouches, formed by the invagination of the nuclear envelope, contain a substance similar to that of the perinuclear substance.
J.L. Courtens, A. Depeiges
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