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  • Fine structure
  • Springer  (3)
  • American Geophysical Union
  • Irkutsk : Ross. Akad. Nauk, Sibirskoe Otd., Inst. Zemnoj Kory
  • Krefeld : Geologischer Dienst Nordhein-Westfalen
  • Wiley
  • 2015-2019
  • 2005-2009
  • 1975-1979  (3)
  • 1970-1974
  • 1975  (3)
Collection
Keywords
Publisher
  • Springer  (3)
  • American Geophysical Union
  • Irkutsk : Ross. Akad. Nauk, Sibirskoe Otd., Inst. Zemnoj Kory
  • Krefeld : Geologischer Dienst Nordhein-Westfalen
  • Wiley
Years
  • 2015-2019
  • 2005-2009
  • 1975-1979  (3)
  • 1970-1974
Year
  • 1
    Electronic Resource
    Electronic Resource
    Chloride cells of larval Notonecta glauca and Naucoris cimicoides (Hemiptera, Hydrocorisae) (1975)
    Springer
    Cell & tissue research 156 (1975), S. 539-549 
    Details
    ISSN: 1432-0878
    Keywords: Chloride cells ; Waterbugs (Notonecta glauca, Naucoris cimicoides) ; Fine structure ; Osmoregulation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The chloride cells of the larval waterbugs, Notonecta glauca L. and Naucoris cimicoides L., ultrastructurally resemble the caviform chloride cells of other aquatic insects as well as those of teleost fish. Their predominant features are abundant mitochondria, basolateral plasma membrane infoldings and an apical cavity possessing numerous microvilli. After histochemical precipitation of chloride, dense deposits of silver chloride are present in the apical region. The cuticular area overlying the chloride cells is extremely reduced in thickness and differentiated into a plug-like structure. The 1st instars of Notonecta glauca raised from the eggs at various hypo-osmotic salt concentrations have identical numbers of thoracal chloride cells regardless of the external salinity. The number of cells progressively increases with each moult. However, in corresponding larval stages, there is a significant decrease in the number of thoracal chloride cells relative to increases in the external salinity. These results are consistent with the presumptive involvement of the chloride cells in osmotic hyperregulation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00225112
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  • 2
    Electronic Resource
    Electronic Resource
    Spermatogenesis in anthozoa: Differentiation of the spermatid (1975)
    Springer
    Cell & tissue research 157 (1975), S. 185-205 
    Details
    ISSN: 1432-0878
    Keywords: Spermatids ; Fine structure ; Spermiogenesis ; Anthozoa
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The fine structure of spermatids has been examined in Calliactis, Protanthea, Gonactinia and Parazoanthus (Cnidaria, Anthozoa). The sperm cells are relatively simple and lack distinct acrosomes. Their nuclei, spherical in the zoanthid, in the actinians are slendertipped cones. Condensation of the chromatin is interpreted in terms of progressive coiling of densely-stained filaments and the elimination of nucleoplasm. Nuclear elongation occurs in the absence of microtubules. A well-developed centriolar complex is attached to the nuclear envelope by fibres and in this area (that of a shallow fossa in actinian sperm) the nuclear membranes seem to be thickened. The centrioles are surrounded by a mitochondrial collar, especially pronounced in Calliactis. In contact with the mitochondria and nucleus is a ring of lipid-containing vesicles 300–700 nm in diameter. A system of densely-staining vesicles 150–300 nm in size corresponds to the “pro-acrosomal vesicles” described for other coelenterates. They are scattered in the peripheral cytoplasm and are regarded as derivatives of the endoplasmic reticulum. Problems of organelle function and of differentiation during spermiogenesis are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00222065
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  • 3
    Electronic Resource
    Electronic Resource
    The distribution of oxidizable mucosubstances and polysaccharides in the planarian Polycelis tenuis iijima (1975)
    Springer
    Cell & tissue research 161 (1975), S. 263-275 
    Details
    ISSN: 1432-0878
    Keywords: Oxidizable mucosubstances ; Fine structure ; Planaria ; X-ray microanalysis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary A chromic acid oxidation-silver technique was used to localize polysaccharide material in Polycelis tenuis at the electron microscope level. In the epithelium, staining was observed within apical vacuoles and on the free surfaces of the cells. A similar staining was observed in relation to the glycocalyx of the pharyngeal epithelia and that of the flame cells. Silver was deposited in the basement membrane. In the parenchyma, the major components giving a positive reaction were the cyanophil and mucous gland cells. Particularly strong silver staining (confirmed by X-ray microanalysis) was observed in the granules and Golgi apparatus of the cyanophil cells. IDPase activity was also found in relation to the Golgi apparatus and its secretory products. The overall distribution of mucopolysaccharide material was confirmed with the PAS and Alcian blue techniques. The fine structural localization of the Alcian blue was also determined using electron microscopy and X-ray microanalysis.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00220373
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