Results 271 to 280 of about 97,911 (299)
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Hyperactivation of mammalian sperm.
Cellular and molecular biology (Noisy-le-Grand, France), 2004Mammalian sperm commonly show hyperactivated motility just before fertilization. The movement of hyperactivated sperm appears different in fluids of different viscosity and elasticity and in different species, but basically it involves an increase in flagellar bend amplitude and, usually, beat asymmetry.
S S, Suarez, H C, Ho
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Tolerance to the hyperactivating effects of methylamphetamine
Psychopharmacologia, 1974The development of tolerance to the hyperactivating effects of methylamphetamine was studied in the laboratory rat. The results of Experiment I indicated that tolerance did develop. In Experiment II these indications were confirmed and the time course of tolerance was plotted.
D S, Bell, R J, Kirkby, A C, Preston
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[CatSper and sperm hyperactivation].
Zhonghua nan ke xue = National journal of andrology, 2007Elevation of sperm Ca2+ seems to be responsible for an asymmetric form of motility called hyperactivation, which is first seen near the time of fertilization. CatSper family proteins are putative cation channels expressed exclusively in the membranes of the sperm flagellum.
Li-juan, Kong +2 more
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Different Strategies for Hyperactivation of Lipase Biocatalysts
2012One important parameter for the application of lipase catalysts in chemical industries is the specific activity displayed towards natural or unnatural substrates. Different strategies to enhance the lipase activity have been described. The immobilization of lipases on hydrophobic supports by interfacial adsorption at low ionic strength permitted the ...
Jose M, Palomo, Jose M, Guisan
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Hyperactivated Insulin Signaling Cascade in Human Glioblastoma Cells
Critical Reviews™ in Oncogenesis, 2019Glioblastoma multiforme (GBM) is the most common and malignant glial tumor. Although pro-growth, pro-survival, and pro-metastasis insulin signaling has been proposed to be a prominent driver of GBM progression, the insulin receptor (IR) signaling cascade in GBM has not been fully elucidated. Upon binding of the insulin and insulin-like growth factor-1 (
Zhe, Pei +3 more
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Tiny Dancer: EFCAB9 Triggers Sperm Hyperactivation via CatSper
Trends in Biochemical Sciences, 2019The Ca2+-conducting ion channel, CatSper, is expressed exclusively on the sperm flagellum and regulates sperm motility. A new study (Hwang et al., Cell, 2019) reveals that the pH-sensing and Ca2+-binding protein, EFCAB9, is a subunit of the CatSper channel and has a key role in triggering mammalian sperm to change their swimming at fertilization.
Rachel E, Bainbridge, Anne E, Carlson
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Reproduction, Fertility and Development, 2018
Conventional IVF has not yet been implemented in the equine species. One of the main reasons has been the inability to develop a culture medium and incubation conditions supporting high levels of stallion sperm capacitation and hyperactivation in vitro.
R. Felmer +6 more
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Conventional IVF has not yet been implemented in the equine species. One of the main reasons has been the inability to develop a culture medium and incubation conditions supporting high levels of stallion sperm capacitation and hyperactivation in vitro.
R. Felmer +6 more
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Consequences of Capacitation. III. Hyperactivation
1986Hyperactivation (see Yanagimachi, 1981 for terminology) refers to the changed nature of sperm motility that occurs around the time of fertilisation both in-vivo and in-vitro, variously described as “bobbing” (Gwatkin and Anderson, 1969), “whiplash” (Yanagimachi, 1970b; Fraser, 1977; Katz and Yanagimachi, 1980) or “serpentine” (Yanagimachi.
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Hyperactivated Rabbit Sperm Cell Motility Parameters.
1995Abstract : A variety of statistical procedures was used to analyze the motility parameters of separate populations of hyperactivated and non-hyperactivated rabbit sperm cells. The parameter Wobble (WOB) was the most efficient in classifying hyperactivation.
R. J. Young, B. A. Bodt
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