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  • 1
    Electronic Resource
    Electronic Resource
    EXPERIMENTAL STUDIES ON CALCIFICATION IN MOLLUSCS AND THE ALGA COCCOLITHUS HUXLEYI (1963)
    Oxford, UK : Blackwell Publishing Ltd
    Annals of the New York Academy of Sciences 109 (1963), S. 0 
    Details
    ISSN: 1749-6632
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Natural Sciences in General
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1749-6632.1963.tb13463.x
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  • 2
    Electronic Resource
    Electronic Resource
    Crystal formation and growth in bivalve nacre (1974)
    [s.l.] : Nature Publishing Group
    Nature 248 (1974), S. 128-130 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] We selected young individuals of Pteria colymbus, Isogno-mon alatus, I. radiatus, I. bicolor and Brachidontes exustus in which active shell growth was in progress. The molluscs were put. in 6% solution of magnesium sulphate in seawater until the tissues were relaxed, then fixed by a 2% solution of ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/248128a0
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  • 3
    Electronic Resource
    Electronic Resource
    Calcified arteries in a gastropod (1977)
    Springer
    Calcified tissue international 22 (1977), S. 159-172 
    Details
    ISSN: 1432-0827
    Keywords: Calcification ; Artery ; Gastropod ; Spherule
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine , Physics
    Notes: Abstract The anterior aorta and major arteries of the land pulmonate snailAnguispira alternata have large calcium deposits in their walls. These deposits occur inside spherule cells, which line the walls of these vessels. The calcium occurs as amorphous calcium carbonate, in the form of intracellular spherules having alternating layers of organic and inorganic material. The spherule cells appear to be degenerating connective tissue cells; they are characterized by large numbers of spherules and by a cytoplasm which is totally empty except for a nucleus, scattered glycogen particles and a few membrane remnants. The injection of45Ca into the foot of the snail results in rapid incorporation of this calcium into the spherule cells. Although calcium-containing spherules are now known from a wide variety of invertebrate tissues, they have not been previously recorded from arterial walls. The physiologic significance of these deposits is not known.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02010355
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  • 4
    Electronic Resource
    Electronic Resource
    Histopathological effects of diflubenzuron on the cirripede crustacean,Balanus eburneus (1982)
    Springer
    Archives of environmental contamination and toxicology 11 (1982), S. 11-16 
    Details
    ISSN: 1432-0703
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Medicine
    Notes: Abstract Histopathological studies on the cirripede crustacean,Balanus eburneus, at light and electron microscopic levels indicated that the chitin-inhibiting insecticide, diflubenzuron, caused similar disruption of the exoskeleton as observed in insects. Under the light microscope, globular particles were present within the chitinous layers of the cuticle, and these particles appeared electron dense and pleomorphic at the ultrastructural level. The cytoplasm of the cuticle-secreting epidermal cells appeared more dense and showed at least a five-fold increase in multivesicular bodies, which possessed electron dense cores. Barnacles exposed to diflubenzuron for 10 days or longer at 750 and 1,000 ppb were delayed in the premolt phase of cuticle secretion.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01055180
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  • 5
    Electronic Resource
    Electronic Resource
    Influence of the Organic Matrix on Crystal Type in Molluscs (1960)
    [s.l.] : Nature Publishing Group
    Nature 188 (1960), S. 334-334 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Protein matrix was prepared from shells of the fresh-water clam Elliptio complanatus, from the marine fan shell Atrina rigida, and from the nacreous layer of the Japanese pearl oyster Pinctada martensii by decalcifying with 1 per cent sodium ethylenedia-mine tetraacetate at pH 5-0. In each case the ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/188334a0
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  • 6
    Electronic Resource
    Electronic Resource
    Toxicity and molt-accelerating effects of diflubenzuron on the barnacle,Balanus eburneus (1980)
    Springer
    Bulletin of environmental contamination and toxicology 25 (1980), S. 477-481 
    Details
    ISSN: 1432-0800
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Medicine
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01985557
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  • 7
    Electronic Resource
    Electronic Resource
    Studies on formation and resorption of fish scales (1980)
    Springer
    Cell & tissue research 211 (1980), S. 303-316 
    Details
    ISSN: 1432-0878
    Keywords: Fish scale ; Fine structure ; Development ; Calcification ; Cyprinodon variegatus
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Scale formation in Cyprinodon variegatus was found to be initiated at about 26 to 30 days after hatching. Ultrastructural investigation revealed that within 4 to 6 h in the first-formed scales the marginal cells begin to flatten and differentiate into osteogenic cells, which later change to osteoblasts and fibroblasts. These cells are separated from the surrounding epithelial cells by a basal lamina. The osteoid is formed by the marginal and osteogenic cells; the osseous layer by the osteoblasts; and the fibrillary plate by the fibroblasts. The osteoid is formed within 2 to 3 h after the initiation of the scale, and within 20 to 24 h the osseous layer is formed. Hydroxyapatite crystals are deposited in the matrix of the osseous layer without apparent association with collagen fibers. No matrix vesicles or dense bodies are evident at the sites of calcification. The fibrillary plate arises 18 to 20 h after the initiation of the scale. It is also partially calcified, but not before the third week of scale formation. The crystals develop almost exclusively between the collagen fibers at the extreme edge of the calcifying front, but solid calcification of the fibers results with further growth of the crystals. The fibroblasts appear to participate in calcification of the fibrillary plate.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00236451
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  • 8
    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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  • 9
    Electronic Resource
    Electronic Resource
    Cytological examination of reduction bodies of Corvomeyenia carolinensis harrison (Porifera: Spongillidae) (1975)
    New York, NY : Wiley-Blackwell
    Journal of Morphology 145 (1975), S. 483-491 
    Details
    ISSN: 0362-2525
    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Medicine
    Notes: Freshwater sponges, Corvomeyenia carolinensis Harrison, were placed into tap water to induce degenerative reduction body formation. Reduction bodies were examined using light and electron microscopy in order to define their histochemical and ultrastructural characteristics. The reduction body of freshwater sponges is an extremely simple developmental system consisting primarily of an archeocyte reserve delimited by a simple squamous pinacoderm. The freshwater sponge reduction body displays many similarities to overwintering phases of marine sponges. The system presents an unusually straightforward vehicle for investigations of degeneration and regeneration as processes in developmental biology and may represent a reasonable vehicle in which to examine the process of the genesis of lysosomes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jmor.1051450406
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  • 10
    Electronic Resource
    Electronic Resource
    Studies on fish scale formation and resorption. I. Fine structure and calcification of the scales in Fundulus heteroclitus (Atheriniformes: Cyprinodontidae)Contribution No. 220, Belle W. Baruch Institute of Marine Biology and Coastal Research, University of South Carolina, Columbia, South Carolina 29208. (1979)
    New York, NY : Wiley-Blackwell
    Journal of Morphology 159 (1979), S. 49-65 
    Details
    ISSN: 0362-2525
    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Medicine
    Notes: Fine structure of the scales of Fundulus heteroclitus was examined by scanning and transmission electron microscopy. The concentric ridges of the scale surface were characterized by the presence of minute, highly calcified, denticles or tooth-like processes. Needle-shaped crystals of hydrox-yapatite were precipitated not only in the osseous layer but in the intimate lamellae of the fibrillary plate except in portions just below the grooves. The calcification of the osseous layer was observed to proceed by filling the matrix with patches of crystals. The fibrillary plate appeared to calcify by invasion of crystals from the upper calcified zone into spaces between collagen fibers.
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jmor.1051590105
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