New PDF release: 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 song of the huge literature in thefield. offering accomplished, built-in experiences and sound, serious, and provocative summaries, this sequence is a needs to for all lively researchers in environmental and comparative body structure. the current quantity includes six studies 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 true transmitter, norepinephrine, soon disappears, while the adenine-derived co-transmitter, which persists for a longer time around the chromatophores, may actively cause dispersion of the dark pigment. This phenomenon lasts for about a day under normal conditions. After the functional degeneration of the axonal cylinder distal to the cut, chromatophores are mainly under the influence of MSH. Upon prolonged adaptation of the fish to a white background, the dark band gradually becomes pale like the rest of the skin, as Parker (1948) originally reported.

The phenomenon might, therefore, be regarded as corresponding to the spontaneous, repetitive contraction of muscle fibers seen in Ca2+ -free medium. 36 R. Fujii and N. Oshima However, using the crucian carp Carassius, Watanabe (1961) showed that the pulsation of melanophores is due to the spontaneous, rhythmic liberation of pigment-aggregating transmitter from sympathetic fibers. Observing the synchronous pulsations of chromatophores on a scale of Oryzias, Iwata et al. (1981) concluded that the same fiber controls many of melanophores, xanthophores and leucophores which together constitute a motor unit.

1986a). Between these two extreme cases, there are common examples of both systems operating together to varying extents. It is not at all difficult to determine whether or not particular chroma tophores in the skin are regulated by the nervous system. Chromatosomes in light-absorbing dendritic chromatophores become dispersed throughout the cytoplasm when a piece of skin is equilibrated in physiological saline (cr. Sect. 4). If the electrical stimulation of nerve fibers to the skin gives rise to the aggregation of pigment within the chromatophores, we can safely conclude that the cells are under the control of the nervous system.

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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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