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- W1986242608 abstract "Ejaculated human spermatozoa were subjected to nitrogen cavitation (600 psi for ten min) to remove the plasma membrane (PM). Electron microscopic examination of the cavitated cells revealed that 33% of the PM was removed from the sperm which includes both the head and tail regions. The released membrane was separated from the cavitated cells by centrifugation followed by a discontinuous sucrose density gradient centrifugation. A single membrane population was resolved at the 1.0 M sucrose interface. Examination of the isolated membranes by electron microscopy revealed vesicles of various sizes displaying unit membrane structures. Biochemical analysis of the isolated membranes showed a threefold enrichment in the surface membrane marker 5′ nucleotidase and also suggested little contamination by enzymes from the cytosol (lactate dehydrogenase) or mitochondria (cytochrome oxidase). Analytical lipid analysis of the isolated membranes revealed a 26-fold enrichment in the distribution of cholesterol, an 11-fold enrichment of phospholipids, and a cholesterol:phospholipid molar ratio of 0.83. Also found was a twofold increase in glycosphingolipids which are ubiquitous components of PM in eukaryotic cells. These data indicate that the membrane vesicles isolated after nitrogen cavitation are primarily PM." @default.
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- W1986242608 date "1986-10-01" @default.
- W1986242608 modified "2023-10-18" @default.
- W1986242608 title "Isolation and partial characterization of the plasma membrane from human spermatozoa" @default.
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- W1986242608 doi "https://doi.org/10.1002/jez.1402400116" @default.
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