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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Pflügers Archiv 431 (1996), S. R247 
    ISSN: 1432-2013
    Keywords: zinc toxicity ; hepatopancreas ; biomarker ; Isopoda ; Crustacea
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract The effect of zinc (Zn)-contaminated food on the shape of digestive gland epithelium was studied in the terrestrial isopod,Porcellio scaber. In animals fed with 5,000 μg Zn g−1 dry wt. of food, the epithelium was flattened in the anterior part of the gland tube. In the posterior part of the gland tube, the shape and size of cells did not change drastically, but they had folded apical surface. In animals fed with more Zn-contaminated food (10,000 μg Zn g−1 dry wt.) the epithelium was uniformly flattened and the basal lamina was intensively folded. In both cases, reduction of lipid bodies was evident. The possibility of using the shape of the gland epithelium as a biomarker of toxic chemicals is discussed.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Pflügers Archiv 431 (1996), S. R251 
    ISSN: 1432-2013
    Keywords: Isopods ; Moult cycle ; Cuticle ; Mineralization ; X-ray microanalysis ; Calcium granules
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract The formation of the cuticle was investigated during moulting of the isopod crustaceanLigia italica. The intermoult cuticle is a four-layered lamellar structure composed of chitin-protein fibrils and mineralized in its upper half. The distribution of calcium carbonate in cuticle during moult cycle was determined by cytochemical methods and X-ray microanalysis. Epi-and exocuticle are secreted during premoult. Calcium is resorbed from the old cuticle and accumulates in the ecdysal gap as calcium granules. Endocuticle is secreted after moult when the mineralization of exocuticle starts. The shape and ultrastructure of epithelial cells change during cuticle secretion and mineralization. Mitochondria, bundles of filaments, calcium granules and large amounts of glycogen accumulate in the apical cytoplasm of cells in premoult animals.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
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