Titlebook: Biology of Spermatogenesis and Spermatozoa in Mammals; Sardul S. Guraya Book 1987 Springer-Verlag Berlin Heidelberg 1987 biochemistry.biol

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Sperm Motilitysed in detail in Chap. X. Sperm motility forms one of the most important parameters in assessing the fertility potential of a semen specimen, as immotile human sperm cannot penetrate cervical mucus (Amelar et al. 1980). The type of movement also influences fertilizing capacity as the vigorous beatin

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https://doi.org/10.1007/978-3-642-71638-6biochemistry; biology; biophysics; cell; cells; chemistry; immunology; mammals; microscopy; molecular biology

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https://doi.org/10.1007/978-3-540-34489-6e of Sertoli cells. It is characterized by complex morphological and biochemical transformations that lead to the formation of a highly specialized cell, the haploid spermatozoon. The spermatozoa are genetically diverse owing to the meiotic events of gene recombination and chromosome reassortment. T

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https://doi.org/10.1007/978-3-540-34489-6uring the postnatal period, the testes mature to perform two functions, one hormonal (e.g. production of testosterone and other sex steroids, which are also well known to be secreted by the foetal testis) and the other production of spermatozoa (spermatogenesis) in the adult. These processes are loc

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https://doi.org/10.1007/978-3-540-34489-6the basal lamina (Figs. 5 and 12). After a series of mitoses, the spermatogonia give rise to the spermatocytes. The spermatogonial cell divisions are usually incomplete. The daughter cells remain interconnected by cytoplasmic bridges. It generally is accepted that mouse spermatogonia undergo six suc

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,Medikamente zur Behandlung von E?st?rungen,rmiogenesis 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 of morphological, histochemical and biochemical changes ending with the production of highly dif

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,Psychopharmaka und Fahrtüchtigkeit,e function of carrying genetic material from the male to the oocyte, consists of two principal parts, such as the head and the tail (Fig. 55). The tail consists of four components, such as the neck, mid-piece, principal piece, and end-piece (Phillips 1975a). The cytoplasmic droplet is present in ass