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By J.L. Arpigny, J. Coyette, S. Davail, G. Feller, E. Fonze, E.C. Foulkes, J.-M. Frere, R. Fujii, S. Genicot, C. Gerday, B. Joris, J. Lamotte-Brasseur, J.N. Maina, E. Narinx, M. Nguyen-Disteche, N. Oshima, A. Vairengo, Z. Zekhnini

ADVANCES IN COMPARATIVE AND ENVIRONMENTAL body structure is helping biologists, physiologists, and biochemists retain tune of the large literature in thefield. supplying entire, built-in experiences and sound, severe, and provocative summaries, this sequence is a needs to for all energetic researchers in environmental and comparative body structure. the current quantity comprises six stories on: - Motile actions of Fish Chromatophores. - Epithelial shipping of Heavy Metals. - Heavy steel Cytotoxicity in Marine Organisms. - Comparative Pulmonary Morphology and Morphometry. - Molecular variations in Resistance to Penicillins. - Molecular diversifications of Enzymes From Thermophilic and Psychrophilic Organisms.

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The rapid changes observable in living animals may also be controlled by the same mechanism. An identical explanation has been presented for the regulation of melanophores of the blue damselfish Chrysiptera cyanea (Kasukawa et al. 1986a) and the bluegreen damselfish Chromis viridis (Oshima et al. 1989). The motile responses of amelanotic melanophores of medakas are also regulated in the same way (Sugimoto et al. 1985). Recent studies on medakas indicate that leucophores respond to adenosine by dispersion of leucosomes (Oshima et al.

If the cell is not exposed to any signaling cues, the chromatosomes may distribute themselves rather evenly within the cytosol as a result of the Brownian movement, a passive process. Nowadays, however, it has become rather commonly accepted that the dispersion of pigment in Na + -rich medium is an active process that reverses aggregation (Fujii 1959b; cf. also Sects. 4). In other words, the dispersion of pigment in saline may be maintained by an active mechanism. The MSH molecules remaining in the tissue space might be responsible for the dispersion.

1991) showed more recently that the stimulation of receptors for MCH causes activation of phospholipase C in the membrane. The diacylglycerol that is produced activates protein kinase C, and subsequently the aggregation of melanosomes occurs. Chromatophores other than melanophores have also been shown to be responsive to MCH (Oshima et al. 1986a). Erythrophores of the platyfish (Xiphophorus maculatus) and swordtail (X. helleri), as well as xanthophores and amelanotic melanophores of the medaka (Oryzias latipes), respond quite similarly to the melanophores of many fishes.

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