Download PDF by J.L. Arpigny, J. Coyette, S. Davail, G. Feller, E. Fonze,: Advances in Comparative and Environmental Physiology

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

ISBN-10: 3642785980

ISBN-13: 9783642785986

ISBN-10: 3642786006

ISBN-13: 9783642786006

ADVANCES IN COMPARATIVE AND ENVIRONMENTAL body structure is helping biologists, physiologists, and biochemists hold tune of the vast literature in thefield. delivering entire, built-in studies and sound, serious, and provocative summaries, this sequence is a needs to for all energetic researchers in environmental and comparative body structure. the current quantity comprises six experiences 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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These phenomena are probably a reflection of the fact that fish are endowed with abilities that allow them to realize various delicate, intermediate hues which could not be generated in the absence of such differential control mechanisms. 2 Neuronal Substances Like those of hormones, the effects of neuronal substances on chromatophores have been studied for many years (Fujii 1961, 1969; Fujii and Novales 1972). factors Influencing Motile Activities of Fish Chromatophores 25 Reliable data have, however, only been obtained quite recently.

In recent years, receptors for opioid peptides have been shown to exist in the brain, as well as in the peripheral tissues, of vertebrates. These peptides have also been shown to inhibit liberation of transmitters from nerve terminals. Therefore, a role for such neuropeptides in modulating the primary effects of endocrine or nervous signals on chromatophores might be expected. A possible relationship between endogenous opioid peptides and the secretion of MSH has been examined. From the first experiments on the chromatic system in fish, Satake (1980) reported that an intracranial injection of naloxone, a specific inhibitor of opiate receptors, induced aggregation of pigment in xanthophores of goldfish.

2), various biogenic substances have been shown in influence the state of chromatophores. Some may act directly on the effector cells, while others act indirectly by activating or inhibiting the liberation of transmitters or hormones. Naturally, such substances are considered not to have crucial roles in the regulation of the motile activities of chromatophores. Nevertheless, further investigations may reveal that at least some of them are indispensable for the control of chromatophores since it has become more and more apparent that chromatophores of fish are subject to incredibly delicate and subtle control (cf.

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Advances in Comparative and Environmental Physiology 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

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