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  • 1
    Electronic Resource
    Electronic Resource
    Light and electron microscopic cytochemistry of the epidermal mucoid cells ofAeolidia papillosa andCoryphella rufibranchialis (Mollusca, Nudibranchia) (1983)
    Springer
    Protoplasma 114 (1983), S. 14-22 
    Details
    ISSN: 1615-6102
    Keywords: Cytochemistry ; Epidermis ; Golgi apparatus ; Mucoid cells ; Nudibranchia
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary The epidermal mucoid cells in the cerata ofAeolidia papillosa andCoryphella rufibranchialis were cytochemically tested to determine the composition of their secretory products. The PAS, alcian blue, PA-TSC-SP and high iron diamine stains were used to determine the presence of acidic, sulphated, and periodate-reactive groups on the mucopolysaccharides. The secretory granules in mucoid cells ofA. papillosa consisted of periodate-reactive mucopolysaccharides with acid groups other than sulphates. Each granule also contained fibrils which were not oxidized by periodic acid. The mucoid secretory granules inC. rufibranchialis contained weakly acidic sulphated mucopolysaccharides, but no periodate-reactive polysaccharide groups. In both aeolid nudibranchs the Golgi apparatus at the base of the mucoid cells contained products which stained the same as those in the secretory granules, confirming that the Golgi apparatus is involved in the synthesis of mucoid secretory products. In addition the mucoid cell Golgi complex ofC. rufibranchialis also gave rise to ellipsoid vacuoles which contained sulphated mucopolysaccharides.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01279864
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    The Golgi apparatus in epidermal mucoid and ellipsoid-vacuolate cells ofAeolidia papillosa andCoryphella rufibranchialis (Nudibranchia) (1980)
    Springer
    Protoplasma 102 (1980), S. 217-233 
    Details
    ISSN: 1615-6102
    Keywords: Epidermis ; Golgi apparatus ; Nudibranchia ; Secretion
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary The epidermal cell layer of the apical end of the ceras was investigated in two species of aeolid nudibranchs. Based on cellular inclusions, mostly two cell types were found: mucoid and ellipsoid-vacuolate cells. Mucoid cells ofCoryphella rufibranchialis have large heterogeneous and fibrillar secretory granules whereas inAeolidia papillosa, the granules are homogeneous, but vary in electron density from one cell to another. Ellipsoid-vacuolate cells contained large quantities of small vacuoles with an included ellipsoidal structure. Both species contained very numerous ellipsoid-vacuolate cells. Secretory granules and ellipsoid-vacuoles appear to arise from the Golgi apparatus and these contents stain with PAS, suggesting a polysaccharide composition. Mucoid cells contained both secretory granules and ellipsoid-vacuoles which may arise from the same Golgi apparatus.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01279589
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    Paper (German National Licenses)
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  • 3
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    An analytic formulation for heating source memory in the thermospheric composition (1981)
    In:  Other Sources
    Details
    Publication Date: 2011-08-18
    Description: Numerical calculations from a spectral circulation model are utilized to construct an analytic Green's function formulation describing the meridional, time-dependent thermospheric composition and temperature response during magnetic storms. The purpose is to develop a formulation that embodies source memory while being sufficiently simple to serve as a heuristic guide for empirical modeling. By passing from the discrete Fourier series representation, utilized for the numerical circulation model, to a continuous Fourier integral representation, explicit waves are obtained for the thermospheric response times. The response times are altitude and species dependent and can exceed two days below 200 km. Thus, for certain storm scenarios, pronounced source memory signatures for the composition and temperature are predicted. Response times obtained from the formulation are shown to give a response consistent with previously published neutral composition data from AE-C for the February 1974 storm when an ap dependent heat source is employed.
    Keywords: GEOPHYSICS
    Type: Journal of Geophysical Research; 86; May 1
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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    Semiempirical modeling of thermospheric magnetic storms (1981)
    In:  Other Sources
    Details
    Publication Date: 2011-08-18
    Description: An improved formulation for empirical modeling of magnetic storm effects in neutral thermospheric composition and temperature is utilized in a study of two disturbed periods. The formulation, which incorporates the prior history of the heat input rather than a single phase delay, is based on a Fourier integral representation of an existing theoretical model. This results in an improved representation of the detailed time variations and a better carry-over of model parameters from one storm to the other and provides a basis for theoretical interpretation.
    Keywords: GEOPHYSICS
    Type: Journal of Geophysical Research; 86; May 1
    Format: text
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    NASA TECHNICAL REPORTS
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