Download Biology of the Integument: Invertebrates by K. Sylvia Richards (auth.), Prof. Dr. Jürgen Bereiter-Hahn, PDF

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

The integument performs a massive function within the survival of meta­ zoans by means of isolating and conserving them from a opposed environ­ ment. Its functionality levels from safety opposed to harm and in­ fection; partlcipation within the legislation of physique temperature and water stability, to breathing job, tracking of the environ­ ment and creation of indications on the topic of behaviour. these kind of end result from particular structural, biochemical and physiological homes of intra-and extracellular elements of the integu­ ment. therefore its characterization should be most sensible comprehensive by way of a multidisciplinary method with authors really good in several fields of technological know-how. This multi-author booklet, 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 geared up totally on a phylum foundation. because the point of information at the integument of phyla differs significantly, the knowledge supplied is correspondingly both restricted or con­ densed. For the various smaller teams of invertebrates little info is out there, as frequently just a couple of electron micrographs are to be present in the literature; however, from the big physique of information latest for vertebrates, really for mammals, no entire evaluation might be supplied, yet publica­ tions giving entry to additional info were reviewed critically.

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J Cell Sci 10:211-227 McNutt NS, Weinstein RS (1973) Membrane ultrastructure at mammalian intercellular junctions. Prog Biophys Mol Bioi 26:45--101 Meyran J-C (1982) Segmental variations of intercellular junctions in insect Malpighian tubules: A comparative study of two species. J Ultrastruct Res 79: 31-46 Noirot-Timothee C, Noirot C (1980) Septate and scalariform junctions in arthropods. Int Rev CytoI63:97-140 N oirot-Timothee C, Graf F, N oirot Ch (1982) The specialization of septate junctions in regions of tricellular junctions II.

7). 4 Dynein Binding to Microtubules A prerequisite to dynein cycling is an ATP-dependent binding of dynein to the microtubules. Gibbons (1963) initially demonstrated that isolated dynein would recombine with axonemes. Takahashi and Tonomura (1978) repeated this work and found that not only did dynein bind to the A subfibre but also to the B subfibre. Similar results have been demonstrated by Satir et al. (1981). This dynein decoration of the doublets possessed a specific polarity, Cilia 35 N+1 N Tip ease Rigor Release of the Dynein arm Reextension of the Dynein arm A B C • • • DP+P, The extended Dynein arm rebinds at a new site D To adjust polarity.

4 Mechanisms of Ciliary Motility Early investigators suggested that motility was generated by repetitive sequential contraction of fibres (Gray 1928, 1955; Bradfield 1955). With the discovery that muscle contractility could be produced by interfilament sliding rather than filament shortening, a new hypothesis for ciliary motility was developed. 1 The Sliding-Microtubule Hypothesis Following the discovery of the dynein arms in 1959, Afzelius suggested that, because of the similarity between ciliary design and the organisation of the actin and myosin filaments of skeletal muscle, ciliary motility might be achieved by the sliding of adjacent microtubules.

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