In this chapter the dynamics of molecular motions in the mammalian sperm plasma membrane will be discussed. View Article Google Scholar 8. Schulz JR, Sasaki JD, Vacquier VD Increased association of synaptosome-associated protein of 25 kDa with syntaxin and vesicle-associated membrane protein following acrosomal exocytosis of sea urchin sperm. View Article Google Scholar. In the winter and spring, the proportion of sperm with intact membranes increased whereas that of sperm with damaged acrosomal membranes decreased.
Gene Ontology and GO Annotations
The findings obtained in this study demonstrate that Nelore bulls in early puberty have a small proportion of sperm with intact membranes and that they exhibit low sperm motility, vigor, and wave motion. Four types of spermatozoa were prepared: Earlier studies also reported low sperm concentration and progressive motility during bull puberty Martins et al. English pdf Article in xml format Article references How to cite this article Automatic translation. Direct injection of a single spermatozoon into an oocyte ICSI can produce apparently normal offspring. Tukey's multiple comparisons test in the GLM procedure in SAS was performed to check for statistically significant differences.
How Pig Sperm Prepares to Fertilize: Stable Acrosome Docking to the Plasma Membrane
Introduction Mammalian sperm cells are activated during migration in the female genital tract. However, there was a relationship between morphologically normal sperm and litter size as well as number of piglets born alive, although relatively low. Indications from the lateral diffusion rates of lipid-soluble fluorescent dyes, Dev. Moreover, this area coincides with the area where sperm membrane rafts have been shown to aggregate during capacitation treatments  ,  , . Assessment of sperm quality traits in relation to fertility in boar semen. This complex was only recovered in the cavitated membrane fraction Fig. Novel is the capacitation-dependent transition from step A to step B Fig.
Among neutral lipids sterols, steryl esters and 1-O-alkyl-2,3-diacyl glycerol decreased appreciably, while, among phospholipids, major loss was observed for phosphatidylcholine and phosphatidylethanolamine. To study the role of these proteins in sperm-oocyte interaction we mimicked this contact by application of the plasma membranes isolated from capacitated sperm cells to an affinity column made of purified zona pellucida fragments. Some authors are reluctant in using the whole egg yolk as an extender for cryopreservation as it diminishes the respiration and motility of spermatozoa [ 74 — 76 ]. Information on other cell-surface macromolecules, especially on cilia and flagella, is available in a number of articles e. It should be noted that human spermatozoa have more stable plasma membranes than the spermatozoa of other species tested Table 1.