Results 311 to 320 of about 90,893 (356)
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Sulphasalazine and Spermatogenesis
Digestion, 2009The semen of 11 patients with inflammatory bowel disease treated with sulphasalazine (Salazopyrin) was analysed and compared with that of 6 men with similar disease not treated with the drug. The treated group had significantly reduced sperm population density and motility compared with the untreated group.
J G, Freeman, V A, Reece, C W, Venables
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The Anatomical Record, 1972
AbstractThe cycle of the seminiferous epithelium of the dog was divided into eight stages, using as criteria the shape of the spermatid nucleus, the location of spermatids and spermatozoa in regard to the basement membrane, the presence of meiotic figures and the release of spermatozoa from the lumen of the tubule.
R H, Foote, E E, Swierstra, W L, Hunt
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AbstractThe cycle of the seminiferous epithelium of the dog was divided into eight stages, using as criteria the shape of the spermatid nucleus, the location of spermatids and spermatozoa in regard to the basement membrane, the presence of meiotic figures and the release of spermatozoa from the lumen of the tubule.
R H, Foote, E E, Swierstra, W L, Hunt
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Epigenetics in spermatogenesis
Molecular and Cellular Endocrinology, 2009DNA methylation is a heritable epigenetic modification of cytosine residues within CpG dinucleotides associated with the modulation of gene expression and found at 20-30 million sites throughout the mammalian genome. The methylation of DNA is catalyzed by DNA (cytosine-5)-methyltransferases (DNMTs), regulates genes during development and plays a role ...
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Fertility and Sterility, 2014
In mammals, male gametes are produced inside the testis by spermatogenesis, which has three phases: mitotic proliferation of spermatogonia, meiosis of spermatocytes, and haploid differentiation of spermatids. The genome of male germ cells is actively transcribed to produce phase-specific gene expression patterns.
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In mammals, male gametes are produced inside the testis by spermatogenesis, which has three phases: mitotic proliferation of spermatogonia, meiosis of spermatocytes, and haploid differentiation of spermatids. The genome of male germ cells is actively transcribed to produce phase-specific gene expression patterns.
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International Urology and Nephrology, 2013
This review mainly focuses on our understanding of spermatogenesis in physiological and pathological hypoxic condition. Real hypoxia is closely related to vascular changes and an increase in testicular temperature. Both induce a reduction in sperm count and can be related to the increase in germ cell apoptosis.
Ljubinka, Jankovic Velickovic +1 more
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This review mainly focuses on our understanding of spermatogenesis in physiological and pathological hypoxic condition. Real hypoxia is closely related to vascular changes and an increase in testicular temperature. Both induce a reduction in sperm count and can be related to the increase in germ cell apoptosis.
Ljubinka, Jankovic Velickovic +1 more
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Microtubules and spermatogenesis
Seminars in Cell & Developmental Biology, 2014Microtubules are dynamic polymers of tubulin subunits that underpin many essential cellular processes, such as cell division and migration. Spermatogenesis is the process by which spermatogenic stem cells undergo mitotic and meiotic division and differentiation to produce streamlined spermatozoa capable of motility and fertilization.
O'Donnell, L., O'Bryan, M.
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2009
For many years androgens were thought to be the primary hormones required for proper functioning of the male reproductive system, and testes were shown to be the major producers of the hormone. In the 1970s it was recognized that in addition to androgens testes were also a source of estrogens, and the intratesticular concentration of estrogens was ...
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For many years androgens were thought to be the primary hormones required for proper functioning of the male reproductive system, and testes were shown to be the major producers of the hormone. In the 1970s it was recognized that in addition to androgens testes were also a source of estrogens, and the intratesticular concentration of estrogens was ...
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Microscopy Research and Technique, 1995
AbstractSpermatogenesis is a process of division and differentiation by which spermatozoa are produced in seminiferous tubules. A measure of efficiency of spermatogenesis is the estimated number of spermatozoa produced per day per gram of testicular parenchyma.
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AbstractSpermatogenesis is a process of division and differentiation by which spermatozoa are produced in seminiferous tubules. A measure of efficiency of spermatogenesis is the estimated number of spermatozoa produced per day per gram of testicular parenchyma.
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Nature, 1962
THE interpretation of the structure of the spermatozoa of cestodes and of the process of spermatogenesis is subject to wide divergence of opinion. In 1935 Young1 directed attention to the lack of knowledge regarding cestode structure and development, and among the main problems awaiting solution discussed the method of cell division and the structure ...
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THE interpretation of the structure of the spermatozoa of cestodes and of the process of spermatogenesis is subject to wide divergence of opinion. In 1935 Young1 directed attention to the lack of knowledge regarding cestode structure and development, and among the main problems awaiting solution discussed the method of cell division and the structure ...
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The International Journal of Developmental Biology, 1996
A short summary on the present knowledge on spermatogenesis in Drosophila is given which also points out particular questions of interest in the context of this morphogenetic process. Such points of interest are the formation of lampbrush loops in primary spermatocytes, the chromosomal events during meiosis, the occurrence of chromatin rearrangements ...
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A short summary on the present knowledge on spermatogenesis in Drosophila is given which also points out particular questions of interest in the context of this morphogenetic process. Such points of interest are the formation of lampbrush loops in primary spermatocytes, the chromosomal events during meiosis, the occurrence of chromatin rearrangements ...
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