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  • 1
    Electronic Resource
    Electronic Resource
    An autoradiographic study of calcium transport in spicule formation in the gorgonian Leptogorgia virgulata (Lamarck) (Coelenterata: Gorgonacea) (1985)
    Springer
    Cell & tissue research 239 (1985), S. 305-310 
    Details
    ISSN: 1432-0878
    Keywords: Ca2+ transport ; Calcification ; Autoradiography ; Gorgonians ; Leptogorgia virgulata
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The route of calcium transport to the sites of spicule formation in the gorgonian Leptogorgia virgulata has been examined by the use of 45Ca as a tracer in light- and electron-microscopic autoradiography. From 1 to 15 min after the 15-min incubation the tracer accumulates in the axis. After 15 min there is a movement of label out of the axis largely to the peripheral region of the axis, the axial epithelium, and the mesoglea. By 60 min much of the label is in the spicules reaching its maximum level at 120 min. When calcium enters the scleroblast from the mesoglea, it appears to be transported to the spicule by electron-dense bodies. There does not appear to be a simultaneous release of all ionic calcium from the axis, but rather a continuously increasing efflux which levels off at 60–120 min. Not all of the calcium reaching the axis will traverse it en route to spicules; instead, a portion of it apparently precipitates as an amorphous compound.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00218008
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Synthesis and transport of the organic matrix of the spicules in the gorgonian Leptogorgia virgulata (Lamarck) (Coelenterata: Gorgonacea) (1984)
    Springer
    Cell & tissue research 235 (1984), S. 533-538 
    Details
    ISSN: 1432-0878
    Keywords: Gorgonians ; Organic matrix ; Autoradiography ; Calcification ; Leptogorgia virgulata
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The sequence of the synthesis and transport of the organic matrix of spicules has been elucidated in the gorgonian Leptogorgia virgulata by use of 3H-aspartic acid as the tracer in electron-microscopic autoradiography. The entire process of matrix synthesis and transport takes approximately 2 h. It seems that the protein moiety of the organic matrix is synthesized in the RER prior to 5 min following the initial 10 min incubation in the tracer. At the 5 min chase the label is moving from the RER to the Golgi complexes where the carbohydrate moiety of the matrix is presumed to be synthesized. At the 5 to 15 min chases the label is transported out of the Golgi complexes via Golgi vesicles. This phase continues for 30 min. From 60 to 120 min the 3H-aspartic acid moves to the spicules. After 120 min the majority of the label has moved into the spicules. Silver grain counts over both multivesicular and electron-dense bodies remain at relatively low and constant levels over 4 h indicating that neither organelle is involved in the synthesis and transport of the organic matrix.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00226950
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Ultrastructural investigation of spicule formation in the gorgonianLeptogorgia virgulata (Lamarck) (Coelenterata: Gorgonacea) (1982)
    Springer
    Cell & tissue research 223 (1982), S. 325-334 
    Details
    ISSN: 1432-0878
    Keywords: Gorgonians ; Spicule ; Scleroblast ; Calcification ; Leptogorgia virgulata
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Ultrastructural examination of original and regenerated branch tips of the gorgonianLeptogorgia virgulata reveals that spicule formation begins with the aggregation of scleroblasts in the mesoglea. Calcite crystal deposition occurs within a Golgi vacuole containing organic matrix. Vacuole size increases while matrix incorporation and subsequent crystal growth continue, filling the vacuole. At approximately this time, the scleroblasts dissociate and “wart” formation begins. Further spicule growth stretches the cell into a thin envelope. Fusion of vacuole and plasma membrane followed by breach formation during spicule growth, as well as scleroblast atrophy or migration from mature spicules, result in the transition of the spicule from the intracellular to the extracellular environment. The results also reveal aborted spicules and digestive bodies, implying possible relationships among calcification, detoxification, and waste management.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01258493
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    Paper (German National Licenses)
    Fulltext
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