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  • ultrastructure  (2)
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  • 1
    Electronic Resource
    Electronic Resource
    Spermiogenesis and the ultrastructure of mature sperm in Eurygaster intergriceps (1984)
    New York, NY : Wiley-Blackwell
    Gamete Research 9 (1984), S. 75-86 
    Details
    ISSN: 0148-7280
    Keywords: spermiogenesis ; spermatozoon ; ultrastructure ; bug ; Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology
    Notes: An electron-microscope study of spermiogenesis and the ultrastructure of mature sperm was made on Eurygaster integriceps. During spermiogenesis, a manchette consisting of two large groups of microtubules and an unusual centriolar adjunct are formed. The latter looks like two half cylinders located almost at right angles to one another. Its wall consists of several dark layers divided by lighter areas. The centriole and its adjunct are not identified in the mature sperm. Bug spermatids have a large amount of amorphous pericentriolar matter, which assists in establishing an unusual nuclear pattern.The mature sperm is distinguished by a number of unique features. Its nucleus consists of three interconnected parts: the inner and outer cylinders and a part freely suspended along the middle piece. The intranuclear channel is blindly closed at the apical end and filled with dark amorphous matter that originates from the pericentriolar matter. The acrosome has an extracellular part resembling a diagonally striated rod, which is sometimes disengaged from its surface. The axoneme has 9+9(2) + 2 tubules. It is connected with the Nebenkern by dark arms.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mrd.1120090107
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  • 2
    Electronic Resource
    Electronic Resource
    The change in the nucleus pattern during chromatin condensation in Eurygaster integriceps spermatids (1985)
    New York, NY : Wiley-Blackwell
    Gamete Research 11 (1985), S. 421-429 
    Details
    ISSN: 0148-7280
    Keywords: spermatid ; nucleus ; bug ; ultrastructure ; Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology
    Notes: When spermiogenesis of Eurygaster integriceps occurs, the pattern of the round nucleus of the spermaiid changes under the influence of a manchette consisting of two large groups of microtubules (up to 130-140 in each). The pericentriolar matter was found to be involved in the changes in the nuclear pattern; it takes part in the formation of the asymmetric intranuclear channel, open at one side. Two zones appear in the nucleus that differ greatly in their rates of chromatin condensation. The two main parts of the future nucleus are thereby established: the apical one with a greater rate of chromatin condensation, which gives origin to the two-walled cylinder, and the outer part, which grows for a long time and extends caudally to the middle piece. At the later stages of nucleus formation, when its larger part is separated from the surface of the middle piece, the vesicles of the endoplasmic reticulum that penetrate between the Nebenkern and the larger part of the nucleus, play a certain role.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mrd.1120110409
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    Paper (German National Licenses)
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