Results 151 to 160 of about 7,796 (196)
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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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Spermiogenesis in the anthozoan Aiptasia pallida
Tissue and Cell, 1980Fine structural aspects of spermiogenesis in the anthozoan Aiptasia pallida have been examined. Nuclear condensation is similar to that reported for other anthozoans. The middle piece is formed by fusion of a few small mitochondria and is doughnut-shaped.
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Effects of colchicine on spermiogenesis in the mouse
Development, 1979ABSTRACT The effects of colchicine on spermiogenesis in the mouse were examined. Mice were injected intratesticularly with colchicine in concentrations of 10−4M to 10−6M for various periods of time. The ultrastructure of the testes was examined and abnormal sperm in the epididymis were scored.
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Ultrastructural features of human spermiogenesis
Zeitschrift f�r Zellforschung und Mikroskopische Anatomie, 1969The ultrastructural features of human spermiogenesis have been correlated with the light microscopic appearance of spermatids. The development of the acrosome together with the changes in nuclear shape, position, size and chromatin configuration are the most useful criteria for ultrastructural staging of spermiogenesis.
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Comparative aspects of mammalian spermiogenesis.
Scanning electron microscopy, 1986The testes of some different orders of eutherian mammals were examined by conventional electron microscopy with respect to their pattern of spermiogenesis. In addition, some of the testes were studied by cytochemical methods for demonstration of certain nuclear proteins and of glycoproteins in the acrosome and the plasma membrane of spermatids.
Plöen, Leif, Courtens, Jean-Luc
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Some aspects of spermiogenesis in a lizard
American Journal of Anatomy, 1967AbstractSpermatids of the American chameleon Anolis carolinensis, have been examined with the electron microscope during the period from the first appearance of caudal sheath microtubules to the stage of differentiation just before the caudal sheath disappears.
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Binucleate Spermiogenesis in the Mouse
Proceedings, annual meeting, Electron Microscopy Society of America, 1972Classically, the male germinal epithelium is depicted as synchronously developing uninucleate spermatids conjoined by intercellular bridges. Recently, binucleate and multinucleate spermatids from human and mouse testis have been reported. The present paper describes certain developmental events in one type of binucleate spermatid in the seminiferous ...
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TDRD7 participates in lens development and spermiogenesis by mediating autophagosome maturation
Autophagy, 2021Tu Chao-Feng, Juan Du, Xuyang Liu
exaly