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  • 1
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    Electron microscopic study on the structure of septate and comb desmosomes (1969)
    Springer
    Details
    Publication Date: 1969-01-01
    Print ISSN: 0302-766X
    Electronic ISSN: 1432-0878
    Topics: Biology , Medicine
    Published by Springer
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  • 2
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    The nature of elastoplastic transition in low-carbon steel samples with and without welds (2017)
    Institute of Physics
    Details
    Publication Date: 2017-12-01
    Print ISSN: 1757-8981
    Electronic ISSN: 1757-899X
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Published by Institute of Physics
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  • 3
    Electronic Resource
    Electronic Resource
    Electron microscopic study on the structure of septate and comb desmosomes (1969)
    Springer
    Cell & tissue research 100 (1969), S. 101-117 
    Details
    ISSN: 1432-0878
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary An electron microscopic study of the desmosomes of Pelmatohydra oligactis and the silkworm (Bombyx mori L.) demonstrates that these two species of invertebrates have two different kinds of desmosomes. The term “septate desmosome” is applicable only in the case of the Pelmatohydra desmosomes, while a new term, “comb desmosome” (Danilova, 1968a, b), is suggested for the insect type. Differences in the structure of these two desmosome varieties can be detected only in tangential sections. In Pelmatohydra, two patterns of septate desmosomes are to be observed in ultrathin sections, yet this difference is due to different directions of the section planes. A scheme to show the structure of the septate desmosome of Pelmatohydra and that of the comb desmosome of insects is presented, as are some variant structures of these desmosomes in sections made in various directions. Globular subunits 30–40 Å in diameter have been detected in the hydroid septa. Fixation with potassium permanganate has failed to reveal any desmosome septa or combs. This observation supports the opinion that septate and comb desmosomes are of non-membranous nature.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00343824
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    Paper (German National Licenses)
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  • 4
    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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  • 5
    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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