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- W3036376195 abstract "The Physidae are among the advanced families of the freshwater snails having very extensive and elaborate genital ducts. To achieve cross fertilization the spermatozoon must travel a long distance along a tortuous path through the oviduct and its secretions. The concept that spermatozoon structure is related to the physiological demands of the fertilization environment has been stated previously (1). The present paper describes a specialized structure associated with the plasma membrane and the loss of the plasma membrane along the midpiece of Physa spermatozoa. In early Physa spermatids, plasma membrane vesiculation is observed concurrently with cellular and nuclear condensation. The midpiece exhibits coiling and folding within the boundaries of the plasma membrane as it develops (Fig. 1). Fig. 2 shows a later stage of maturation in which the plasma membrane becomes closely associated with the midpiece and undergoes extensive vesiculation. The surface of the midpiece is a microtubular sheath." @default.
- W3036376195 created "2020-06-25" @default.
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- W3036376195 date "1977-01-01" @default.
- W3036376195 modified "2023-09-25" @default.
- W3036376195 title "Vesiculation and Loss of the Plasma Membrane along the Midpiece of Physa Sp. Spermatozoon" @default.
- W3036376195 cites W2021221810 @default.
- W3036376195 doi "https://doi.org/10.1017/s0424820100080511" @default.
- W3036376195 hasPublicationYear "1977" @default.
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