Results 211 to 220 of about 57,423 (263)
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Annales d'Endocrinologie, 2022
Male infertility contributes to 50% of all cases of infertility. The main cause is low quality and quantity of sperm. In humans, spermatogenesis starts at the beginning of puberty and lasts lifelong. It is under the control of FSH and testicular androgens, and mainly testosterone (T), and therefore requires a normal gonadotroph axis, intratesticular T ...
Sophie, Christin-Maitre, Jacques, Young
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Male infertility contributes to 50% of all cases of infertility. The main cause is low quality and quantity of sperm. In humans, spermatogenesis starts at the beginning of puberty and lasts lifelong. It is under the control of FSH and testicular androgens, and mainly testosterone (T), and therefore requires a normal gonadotroph axis, intratesticular T ...
Sophie, Christin-Maitre, Jacques, Young
openaire +2 more sources
General and Comparative Endocrinology, 2010
Spermatogenesis is a developmental process during which a small number of diploid spermatogonial stem cells produce a large number of highly differentiated spermatozoa carrying a haploid, recombined genome. We characterise morphologically the different germ cell stages with particular attention for the spermatogonial generations, including the stem ...
Rüdiger Schulz +2 more
exaly +6 more sources
Spermatogenesis is a developmental process during which a small number of diploid spermatogonial stem cells produce a large number of highly differentiated spermatozoa carrying a haploid, recombined genome. We characterise morphologically the different germ cell stages with particular attention for the spermatogonial generations, including the stem ...
Rüdiger Schulz +2 more
exaly +6 more sources
BioFactors, 2001
AbstractPHGPx of rat sperm mitochondrial capsule is cross‐linked and inactive. The enzyme is in part released in an active form by mercaptoethanol. Treatment with H2O2 of reduced and solubilised capsule proteins, in the absence of any added reductant, results in: i) H2O2 consumption which depends on the presence of both, PHGPx activity and protein ...
ROVERI, ANTONELLA +3 more
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AbstractPHGPx of rat sperm mitochondrial capsule is cross‐linked and inactive. The enzyme is in part released in an active form by mercaptoethanol. Treatment with H2O2 of reduced and solubilised capsule proteins, in the absence of any added reductant, results in: i) H2O2 consumption which depends on the presence of both, PHGPx activity and protein ...
ROVERI, ANTONELLA +3 more
openaire +4 more sources
2012
During spermatogenesis, pluripotent germ cells differentiate to become efficient delivery vehicles to the oocyte of paternal DNA. Though male and female germ cells both undergo meiosis to produce haploid complements of DNA, at the same time they also each undergo distinct differentiation processes that result in either sperm or oocytes.
Diana S, Chu, Diane C, Shakes
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During spermatogenesis, pluripotent germ cells differentiate to become efficient delivery vehicles to the oocyte of paternal DNA. Though male and female germ cells both undergo meiosis to produce haploid complements of DNA, at the same time they also each undergo distinct differentiation processes that result in either sperm or oocytes.
Diana S, Chu, Diane C, Shakes
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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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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
openaire +2 more sources
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 ...
openaire +3 more sources