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  • 1
    Publication Date: 1983-01-01
    Print ISSN: 0302-766X
    Electronic ISSN: 1432-0878
    Topics: Biology , Medicine
    Published by Springer
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  • 2
    Publication Date: 1992-01-01
    Print ISSN: 0025-3162
    Electronic ISSN: 1432-1793
    Topics: Biology
    Published by Springer
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Insectes sociaux 23 (1976), S. 49-73 
    ISSN: 1420-9098
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Description / Table of Contents: Summary Puric and mineral accumulation sites in Termites are located into fat body, Malphigian tubules and epiderma. The cations stored are numerous: Ca, Mg, K, Mn, Fe, Zn, Na. Their nature and quantities depend on the species as well as on the stage and the cast. Interference of food with bioaccumulation is evident only if the element ingested is exceptionnaly abundant. Thus iron is present inCubitermes and only in those casts which feed on mould (workers, soldiers). In workers, one must also insist on a perticular feature ofCubitermes which contrary to other species, stores very little. The soldiers, in contrast, appear rather homogenous (high storage in fat body and Malpighian tubules). The evolution leading to nymphs and winged adults represents always in the life cycle of the species the most important pathway as far as bioaccumulation is concerned. Soldiers nymphs and winged adults ofSchedorhinotermes, soldiers and nymphs ofMicrocerotermes andCubitermes are fed by trophallaxy; the particular social behaviour of these two casts is the same in the three species. Thus, some physiological and ethological features species specific and casts specific, favour the puric and mineral bioaccumulation.
    Notes: Résumé Les sites d'accumulation minérale et purique des Termites sont localisés dans le tissu adipeux, les tubes de Malpighi et l'épiderme. Les cations accumulés sont nombreux: Ca, Mg, K, Mn, Fe, Zn, Na. Leur nature et leur quantité dépendent à la fois de l'espèce, du stade et de la caste. L'intervention directe d'une substance alimentaire dans la bioaccumulation n'est évidente que lorsque la nourriture apporte un élément exceptionnellement abondant. Ainsi, le fer n'est présent que chezCubitermes et seulement dans les castes nourries d'humus (ouvriers, soldats). Dans la caste des ouvriers, il faut aussi insister sur le particularisme desCubitermes qui, contrairement aux autres espèces, accumulent peu. La caste des soldats apparaît, par contre, assez homogène (indice d'accumulation du tissu adipeux élevé; fort stockage malpighien). L'évolution qui conduit aux nymphes et aux ailés représente toujours, dans le cycle d'une espèce, la voie la plus importante du point de vue de la bioaccumulation. Soldats et lignée sexuée deSchedorhinotermes, soldats et nymphes deMicrocerotermes etCubitermes sont nourris par trophallaxie, et le comportement social général caractérisant chacune de ces deux «castes» est uniforme dans les trois espèces. Certaines particularités physiologiques et éthologiques propres aux espèces et aux castes concourent donc à l'établissement des divers aspects de la bioaccumulation minérale et purique.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Marine biology 112 (1992), S. 283-292 
    ISSN: 1432-1793
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Densely packed granular inclusions composed of opal filaments were observed in two types of cells in the ascidianStyela clava. Herdman, 1881: oocyte test cells and cells of the interstitial ovarian tissue. Cytochemical analysis, scanning electron microscopy, transmission electron microscopy and microanalysis were used to study the cytology of the ovarian cells. The inclusions consist of intracellular filaments in which silica is bound to proteins. The role of this silica accumulation, very uncommon in invertebrates, is unknown. However, the silica granules are obviously closely related to the acid mucopolysaccharides in which they are embedded. Deposition of silica is linked to the seasonal reproductive cycle, and forms in the interstitial tissue and in the maturing oocytes successively. A taxonomic significance of the silica granules is suggested.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Amsterdam : Elsevier
    Biochemical Systematics and Ecology 20 (1992), S. 541-552 
    ISSN: 0305-1978
    Keywords: Ascidians ; microanalysis ; ovary ; silica ; systematics
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology , Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Amsterdam : Elsevier
    Journal of Insect Physiology 19 (1973), S. 1-18 
    ISSN: 0022-1910
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    Amsterdam : Elsevier
    Journal of Invertebrate Pathology 42 (1983), S. 17-32 
    ISSN: 0022-2011
    Keywords: Locusta migratoria ; cadmium ; glycoproteins ; histopathological effects ; mercury ; metallothioneins
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    Springer
    Cell & tissue research 228 (1983), S. 661-675 
    ISSN: 1432-0878
    Keywords: Digestion ; Excretion ; Storage ; Arachnids ; Microanalysis ; Scorpion
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The liver of a scorpion, Androctonus australis (Arachnida), was examined electron-microscopically and cytochemically, emphasizing correlations between structure, cytochemistry and physiology. The liver consists of digestive diverticula and interstitial tissue. Digestive divertcula are composed of basophilic cells and digestive cells. Basophilic cells produce exoenzymes. Digestive cells ensure intracellular digestion of nutrients absorbed by pinocytosis and store glycogen, lipids and mineral salts; the wastes of the digestive process (guanine, uric acid, mineral elements, pigments) are concentrated in “brown body vacuoles” which are ejected into the lumen of the diverticula. The interstitial tissue stores glycogen and lipids; it contains many lysosome-like organelles rich in iron. Fasting induces a decrease of the ratio of the volume of the divertcula to that of the interstitial tissue, a slow disappearance of the reserves in both diverticula and interstitital tissue, an increase of synthesis in the basophilic cells, and a decrease of the number of vacuoles in the digestive cells. The digestive mode of the scorpions associates a primitive intracellular process with an advanced extracellular process. The interstitial tissue can be considered as homologous to the adipose tissue of insects and myriapods, although it is devoid of urate cells. The excretion of guanine and uric acid has a peculiar meaning, because these purine wastes do not come from endogenous catabolism.
    Type of Medium: Electronic Resource
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