Results 161 to 170 of about 10,843 (205)
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Myosin in early spermatids of the rat
Virchows Archiv B Cell Pathology Including Molecular Pathology, 1981In order to obtain insight into the basic mechanism of cytoplasmic undulation in early spermatids, tubuli seminiferi of young adult rats were fixed in Stieve’s solution and examined immunohistochemically with anti-fast skeletal muscle myosin serum. A number of nuclei of spermatogonia, spermatocytes and spermatids stained intensely, but in addition the ...
H, Walt +3 more
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Transformation of ram spermatid chromatin
Experimental Cell Research, 1978Abstract In order to investigate the sequence of changes in nuclear basic proteins throughout ram spermiogenesis, we have used different techniques to obtain populations of spermatid nuclei in specific stages of maturation. Sedimentation of testis cells at 1 gravity followed by treatment with Triton X-100 resulted in one population of round spermatid
M, Loir, M, Lanneau
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Nuclear shaping in marsupial spermatids
Journal of Ultrastructure Research, 1972Nuclear shaping was investigated in two species of American opossum, Didelphus virginiana and Marmosa mitus. The mature spermatozoan head achieves its “U” shaped form by the progressive flattening of the posterior margin of the nucleus and the development of a protrusion on one side of the nucleus.
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Hormonal regulation of spermatid binding
Journal of Cell Science, 1991ABSTRACT A Sertoli-spermatid coculture model is described in which a large percentage (>76%) of round spermatids remain viable for 48 h and bind to Sertoli cells. The effects of follicle-stimulating hormone (FSH) and testosterone on spermatid binding (expressed as the spermatid density; SD- the number of spermatids per unit area ...
D F, Cameron, K E, Muffly
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Microtubules in the spermatids of stick insects
Journal of Ultrastructure and Molecular Structure Research, 1988Spermatids from two phasmid species were seen to possess an unusually large amount of microtubules along the nucleus and tail. Some of the microtubules have a loosely fitting sleeve for half a micron or more. During late stages in spermiogenesis the microtubules aggregate and form one or several "microtubular crystals" consisting of electron-lucid ...
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Centrioles in the Spermatids of Insects1
Annals of the Entomological Society of America, 1968The University of Texas at Austin There have been many statements published regarding the number of centrioles in the spermatids of insects. Some earlier workers reported the occurrence of 2 centrioles in several groups of insects, although only one was seen in the spermatids of some species (summarized in Wilson 1928).
Osmond P. Breland +3 more
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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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Mouse Round Spermatid Injection
Journal of Visualized ExperimentsRound spermatids, characterized by their haploid genetic content, represent the precursor cells to mature spermatozoa. Through the innovative technique of round spermatid injection (ROSI), oocytes can be successfully fertilized and developed into viable fetuses. In a groundbreaking milestone achieved in 1995, the first mouse fetus was born through ROSI
Haibo, Zhu +6 more
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Intranuclear whorls in the hamster spermatid
Journal of Ultrastructure Research, 1969In the 2-week-old hamster, intranuclear whorls were observed in cells located among the spermatids. The whorls, measuring up to 2.5 μ in diameter, were composed of sheets of microtubules. The distance between the individual sheets was 150 A, the tubular lumen was 80 A, and the tubular wall measured 120 A. It is assumed that the presence of intranuclear
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