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- W2389921909 abstract "The ultrastructure of spermatozoon and the penetration into egg in Meretrix meretrix were observed carefully by both scanning and transmission electron microscopes. The results indicate that the mature spermatozoa (45—50μm in total length) were primitive type, consisting of head, middle piece and tail. The head, like a long cocoon in shape (3.0μm in length), is composed of acrosome and nucleus. The acrosome is upside down V-shaped with a protruding short cylinder at the top. Nucleus are slightly curved with fine-grained dense chromatin, having posterior nuclear fossa but anterior ones. The centriolar complex, including proximal and distal centrioles, and surrounding 5 spherical mitochondrias, make up the short middle piece (0.6—0.7μm). The tail, a whip-like flagellum (42—45μm in length), consists of axoneme that is a typi- cal 9 + 2 microtubular structure and wrapped by an wavy plasma membrane. The sperm penetration into the egg was observed under a scanning electron microscope. Like most of marine mollusks, three phases could be observed: acrosome reaction, penetrating, and vitelline membrane repair. Two minutes after fertilization, the sperm attaching to the egg induced acrosome reaction, and led to the breakdown of acrosome vesicle and release of hydrolase to loosen vitelline membrane for easy break. And then, the acrosome filament from subacrosome pierced into vitelline membrane. Four to six minutes later, the head and middle piece of sperm entered into egg cytoplasm, leaving a hole of 1.5μm in diameter at the vitelline mem- brane. Eight to ten minutes after fertilization, the tail fell off and the hole was repaired by microvilli. In addition, ultra- structure of spermatozoon and sperm mitochondria in various bivalves are discussed in this paper." @default.
- W2389921909 created "2016-06-24" @default.
- W2389921909 creator A5061664762 @default.
- W2389921909 date "2010-01-01" @default.
- W2389921909 modified "2023-09-25" @default.
- W2389921909 title "ELECTRON MICROSCOPE OBSERVATION ON ULTRASTRUCTURE OF SPERMATOZOON AND PENETRATION IN MERETRIX MERETRIX" @default.
- W2389921909 hasPublicationYear "2010" @default.
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