Results 321 to 330 of about 220,871 (359)
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TEST-yolk media and sperm quality
Human Reproduction Update, 1995Media prepared with egg yolk and two buffers, TES and Tris, called TEST-yolk have been shown to have beneficial effects on the survivability, fertilizing capacity and storage potential of human spermatozoa. Egg yolk lipoproteins are the critical compounds for the beneficial effects, with a synergistic effect due to the TES-Tris buffer component.
R S, Jeyendran +3 more
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Mammalian sperm quality and aromatase expression
Microscopy Research and Technique, 2009AbstractIn most mammalian species the aromatase is encoded by a single gene (cyp19), which contains 18 exons, 9 of them being translated. In adult rats, together with Leydig cells germ cells represent an additional source of estrogens. The amount of P450arom transcript is threefold higher in pachytene spermatocytes compared to younger cells ...
Carreau, Serge +2 more
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General and Comparative Endocrinology, 2010
Fish egg quality can be defined as the ability of the egg to be fertilized and subsequently develop into a normal embryo. Similarly, sperm quality can be defined as its ability to successfully fertilize an egg and subsequently allow the development of a normal embryo.
Bobe, Julien, Labbé, Catherine
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Fish egg quality can be defined as the ability of the egg to be fertilized and subsequently develop into a normal embryo. Similarly, sperm quality can be defined as its ability to successfully fertilize an egg and subsequently allow the development of a normal embryo.
Bobe, Julien, Labbé, Catherine
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Dithiothreitol Effects on Human Sperm Quality
Journal of Urology, 1994Human semen normally coagulates immediately after ejaculation and then undergoes liquefaction during the next 15 to 60 minutes. Incomplete seminal liquefaction can result in impaired sperm motility and make clinical evaluation and manipulation difficult.
M J, Barmatz +2 more
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Sperm nuclear protamines: A checkpoint to control sperm chromatin quality
Anatomia, Histologia, Embryologia, 2018AbstractProtamines are nuclear proteins which are specifically expressed in haploid male germ cells. Their replacement of histones and binding to DNA is followed by chromatin hypercondensation that protects DNA from negative influences by environmental factors. Mammalian sperm contain two types of protamines: PRM1 and PRM2.
Klaus Steger, Rod Balhorn
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Association between obesity and sperm quality
Andrologia, 2017There is awareness of likelihood of abnormal spermatozoa in obese men; however, results from previous studies are inconclusive. Advances in computer-aided sperm analysis (CASA) enable precise evaluation of sperm quality and include assessment of several parameters. We studied a retrospective cohort of 1285 men with CASA data from our infertility clinic
G. A. Ramaraju +6 more
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Sperm quality during extra‐gonadal sperm reserve depletion in stallions
Reproduction in Domestic Animals, 2018ContentsTo estimate when, during stallions’ extra‐gonadal reserves (EGR) depletion period, sperm quality would reach its highest quality, six light breed sexually rested stallions were collected daily for 7 days to deplete EGR. On collection days 1, 3, 5, and 7, sperm output, total (TM) and progressive (PM) motility, morphology, and plasma membrane ...
Jose A. Len +3 more
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Making sperm: design, quality control and sperm competition.
Society of Reproduction and Fertility supplement, 2007Spermatozoa vary remarkably in design at several different levels: phyla, orders, families, species, individuals, within individuals and within ejaculates of the same individual. Three factors are thought to account for some of this variation: (i) fertilisation mode; (ii) phylogeny, and (iii) postcopulatory sexual selection (i.e.
Tim R, Birkhead, Simone, Immler
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[Sperm quality and selection].
Journal de gynecologie, obstetrique et biologie de la reproduction, 2008Selection of a live and morphologically normal spermatozoa is a fundamental stage in ICSI success because of its potential effects on early and late embryo development. In addition to the routine tests such as the spermogram and the spermocytogram, a number of tests have been developed for this purpose : the hyaluronic acid test, which measures the ...
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Sperm Production and Variance in Sperm Quality
2009An unusually high level of inter- and intraspecific variability in spermatozoa has been well documented. However, recent evidence indicates that the level of variation within spermatozoa differs markedly across taxa. In particular, it appears that the variability in spermatozoa tends to decrease across species as the risk of sperm competition increases.
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