Membrane Of Bovine Spermatozoa
Mostrando 1-8 de 8 artigos, teses e dissertações.
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1. Association of L-arginine with heparin on the sperm capacitation improves in vitro embryo production in bovine
Abstract We aimed to evaluate the effects of L-arginine (L-arg) in the quality of in vitro heparin-induced capacitation of cryopreserved bovine spermatozoa and its effects on IVP. The experimental groups were: Control 0 hour without pre-capacitation, and groups of sperm capacitated for 30 min in the absence of COC with heparin (Control 30 min), with 1 mM L-a
Anim. Reprod.. Publicado em: 25/11/2019
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2. Effect of different percoll procedures on sperm quality and in vitro production of bovine embryos / Efeito de diferentes protocolos de Percoll na qualidade espermática e na produção in vitro de embriões bovinos
Techniques for sperm selection are usually used for bovine in vitro embryo production (IVP) to improve semen quality after thawing. Among these techniques Percoll gradient has been the most used. The aim of this study was to evaluate the effect of different volumes of Percoll, time and force of centrifugation on sperm quality, embryo development and sex of I
Publicado em: 2009
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3. AnÃlise proteÃmica do plasma seminal e secreÃÃes do epidÃdimo em ruminantes: potenciais associaÃÃes com o desenvolvimento sexual, parÃmetros seminais e funÃÃo espermatica / ProteÃmica analysis of the plasma seminal and secretions of epidÃdimo in ruminants: potential associations with the sexual development, seminal parameters and espermatica function
Este trabalho se compÃe de trÃs estudos distintos, avaliando diferentes enfoques da composiÃÃo das proteÃnas expressas nos fluidos reprodutivos de ruminantes. O primeiro estudo descreve as variaÃÃes no perfil protÃico do plasma seminal de ovinos Santa InÃs. O segundo avalia as proteÃnas presentes no fluido da cauda do epidÃdimo de touros HolandÃs
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 25/04/2007
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4. Liofilização de espermatozóides bovinos: viabilidade estrutural e funcional
Lyophilization is a procedure developed for cell preservation, as a result of restriction of active water from biological systems by ice sublimation. Recently, freeze-drying process has been used to preserve mammalian spermatozoa, becoming an alternative tool for genetic material preservation. In the present thesis the effect of lyophilization with different
Publicado em: 2006
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5. Efeito in vitro da adição do levonorgestrel sobre a concentração intracelular de calcio em espermatozoides de homens ferteis
The spermatozoa is a highly specialized cell because it contains morfophysiological modifications that guarantees fecundation success. Spermatozoa must undergo three sequential changes before they acquire their fertilizing capacity: maturation in epididymis, capacitation and acrosome reaction (RA). Capacitation is a process that takes place in the female rep
Publicado em: 2006
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6. Effects of bovine semen cryopreservation on sperm plasmatic, acrosomal, and mitochondrial membranes and chromatin structure using fluorescent probes / Efeitos da criopreservação do sêmen bovino sobre as membranas plasmática, acrossomal e mitocondrial e estrutura da cromatina dos espermatozóides utilizando sondas fluorescentes
The process of cryopreservation causes damages in the sperm cellular function which may lead to a reduction in fertility. New techniques to evaluate sperm viability may improve the process of semen evaluation. The present work was divided in two experiments. Experiment 1 aimed the development and validation of practical techniques with high repetibility for
Publicado em: 2005
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7. Effects of thermal stress and recombinant bovine somatotropine employment on seminal features, integrity of membranes, mitochondrial function and chromatin structure of spermatozoa from Simmental bulls (Bos taurus taurus) / Efeitos do estresse térmico testicular e do uso da somatotropina recombinante bovina nas características seminais, integridade de membranas, função mitocondrial e estrutura da cromatina de espermatozóides de touros Simental (Bos taurus taurus)
Modern approach concerning binomial thermal stress-testicular degeneration was done in order to study chromatin, acrosomal and mitochondrial integrity. Furthermore, there are few relates about effects of exogenous bovine somatotropine (bST) on seminal quality of bulls which were submitted to thermal stress and consequent testicular degeneration. The objectiv
Publicado em: 2004
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8. Manganese provides antioxidant protection for sperm cryopreservation that may offer new consideration for clinical fertility
Reactive oxygen species (ROS) are generated by sperm metabolism. While, ROS are required for maturation, capacitation and acrosome reaction, they also modify many peroxidable cellular compounds. There is production of ROS during cryopreservation and frozen spermatozoa are highly sensitive to lipid peroxidation (LPO). Antioxidants exert a protective effect on
Landes Bioscience.