Download Biology of the Integument: 2 Vertebrates by A. Gedeon Matoltsy, Jürgen Bereiter-Hahn (auth.), Prof. Dr. PDF

By A. Gedeon Matoltsy, Jürgen Bereiter-Hahn (auth.), Prof. Dr. Jürgen Bereiter-Hahn, Prof. Dr. A. Gedeon Matoltsy, Dr. K. Sylvia Richards (eds.)

The integument performs a tremendous position within the survival of meta­ zoans via setting apart and holding them from a opposed environ­ ment. Its functionality levels from security opposed to harm and in­ fection, participation within the legislation of physique temperature and water stability, to breathing job, tracking of the environ­ ment and construction of indications regarding behaviour. a majority of these end result from particular structural, biochemical and physiological houses of intra-and extracellular parts of the integu­ ment. therefore its characterization might be top finished by way of a multidisciplinary technique with authors really good in numerous fields of technology. This multi-author publication, in volumes, offers an up-to­ date survey of the literature. the 1st quantity bargains with the integument of invertebrates, the second one with that of vertebrates, either equipped totally on a phylum foundation. because the point of information at the integument of phyla differs significantly, the knowledge supplied is correspondingly both constrained or con­ densed. For the various smaller teams of invertebrates little info is on the market, as frequently just a couple of electron micrographs are to be present in the literature ; nevertheless, from the big physique of information current for vertebrates, really for mammals, no entire evaluate may be supplied, yet publica­ tions giving entry to additional details were reviewed critically.

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The composition of the secretions changes with circumstances and a later analysis of plaice mucus found a composition somewhat different to that in Table 1 (Lopez-Vidriero et al. 1980) with a sulphate content of 15%. In that ca se it was known that the goblet cells had reacted histochemically for sulphated glycoprotein. The mucus was of low viscosity. 1 Histochemistry of Goblet Cells Histochemical studies of skin secretions have on the whole been more rewarding than biochemical studies, and there is a large literature on the subjecL Methods vary between authors, but most investigations rely on combinations of alcian blue (AB) at different pH, and periodic acid-Schiff (PAS), to distinguish neutral and acid glycoproteins.

10 Merkel Cells Epidermal Merkel cells have been found in teleosts (Lane and Whitear 1977), dip no ans (Fox et al. 1980) and lampreys (Whitear and Lane 1981 b), not yet in selachians or hagfish. For description, see Chapter 30. 11 Intrusive Cells Cells within the epidermis but originating elsewhere include chromatophores (Chap. ), the neurom ast cells derived from migratory placode, 26 M. Whitear and neurite processes, although as far as is known no actual neurones occur in fish skin. Some of the nerve fibres connect with the various innervated cells listed (Sects.

Wendelaar Bonga (1978) demonstrated that, in Gasterosteus, prolactin secretion is dependent on environmental calcium level rather than on osmotic gradient. In Sarotherodon, the thickness and mucification of the epidermis in lowcalcium water related to the osmotic gradient regardless of its direction (Wendelaar Bonga and Meis 1981). In normal seawater, with a high calcium level, this fish has a thin epidermis, but the administration of prolactin increases epidermal thickness and the number of goblet cells.

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