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  • Moulting  (1)
  • Radioautography  (1)
  • 1
    ISSN: 1432-0878
    Keywords: Teleost gill ; Chloride cells ; Branchial excretion ; Freeze drying ; Radioautography
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Description / Table of Contents: Résumé Les sites branchiaux d'accumulation de certaines substances (bleu de méthylène, urée, paraaminohippurate et inuline) injectées dans la circulation générale ont été localisés sur des anguilles adaptées à l'eau de mer. Le bleu de méthylène est accumulé et excrété par les cellules à chlorure. Les autoradiographies des corps marqués au 14C: inuline, PAH et urée, faites après cryodessication montrent que les cellules à chlorure accumulent ces substances. La signification de ces résultats est discutée.
    Notes: Summary The branchial site of accumulation of various organic substances (methylene blue, urea, inulin and paraaminohippurate) following intracardiac injection has been localised in sea-water adapted eels. Methylene blue is concentrated and excreted by chloride cells. By combining freeze-drying and radioautographic technique it was possible to demonstrate that chloride cells concentrate urea, inulin and paraaminohippurate. The signification of these results is discussed in relation with the branchial excretion of organic substances.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1432-0878
    Keywords: Moulting ; Epithelium ; Sodium transport ; Rana esculenta
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The present study concerns moulting of the skin in Rana esculenta in vivo and in vitro. The evolution of mitochondria-rich cells (MRC) and changes in the epithelium during moulting were followed. The greater part of the MRC are lost during moulting, either because they remain attached to the old stratum corneum or because they are left in contact with the external medium and degenerate. The cells thus lost leave deep impressions in the new stratum corneum which disappear progressively. Before an MRC is shed, a cell of the stratum intermedium contacting it differentiates to form a new MRC to replace the old. Isolation of the skin triggers moulting in the excised pieces. This moulting does not cause changes in the short-circuit current or in the transepithelial resistance. Aldosterone (10−6 M) added in vitro to the serous side appeared to facilitate the detachment of the slough, however, no clear-cut moult-inducing effect of the hormone was seen.
    Type of Medium: Electronic Resource
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