Results 171 to 180 of about 2,507 (219)

Colour and melanophore function in rainbow trout after long term exposure to the new antifoulant medetomidine

Chemosphere, 2010
Medetomidine is a new antifouling agent, and its effects in non-target aquatic organisms have been investigated. Earlier short-term studies in fish have shown a skin lightening response to medetomidine, but effects after chronic exposure have not been ...
Erik Kristiansson, Lars Förlin
exaly   +3 more sources

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Innervation of iridic melanophores

Zeitschrift f�r Zellforschung und Mikroskopische Anatomie, 1970
The nerve supply to the iridic melanophores of the rat was studied with the electron microscope. The adrenergic and cholinergic terminals were identified with the aid of 5-hydroxydopamine, which produces dense-cored 400–800 A synaptic vesicles in adrenergic axon varicosities, whereas the synaptic vesicles of cholinergic axons remain empty. It was found
B, Ehinger, B, Falck
openaire   +2 more sources

The action of reserpine on teleost melanophores

European Journal of Pharmacology, 1973
Abstract Reserpine caused darkening of both pencil fish and angelfish, this effect lasted for at least 10 and 25 days respectively. The aggregation of pigment granules within the melanophores evoked by stimulation of the nerves supplying the melanophores was inhibited by reserpine in both species.
B C, Finnin, B L, Reed
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Stimulation of melanophores and guanophores by melanophore-stimulating hormone peptides

General and Comparative Endocrinology, 1964
Abstract Both melanophores and guanophores are under the control of hypophysial chromatotropic hormone (CTH, MSH, MDH, intermedin, etc.). This principle induces melanophore expansion and guanophore contraction. In order to compare the structural requirements of CTH for both melanophore and guanophore responses, the efficacy of various MSH peptides on
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Ionic requirements for melanophore stimulating hormone (MSH) action on melanophores

Comparative Biochemistry and Physiology Part A: Physiology, 1979
Abstract 1. 1. Calcium is required for melanophore stimulating hormone (MSH) action on melanophores of the lizard, Anolis carolinensis , the toad, Scaphiopus couchi , and the frog Rana berlandieri forrei . 2. 2. Ca 2+ is required for an initial mechanism of MSH action, but not for melanosome dispersion per se , since melanophores respond
Divid L Vesely, Mac E Hadley
openaire   +1 more source

Modeling of pattern regulation in melanophores

Journal of Theoretical Biology, 2007
Melanosomes, pigment granules in melanophores, play a principal role in physiological color adaptation of fish and frog. Melanophores regulate melanosome trafficking on cytoskeletal filaments to generate a range of spatiotemporal patterns. Here, we present the first comprehensive model of spatiotemporal evolution of melanosome patterns.
Dinh, Anh-Tuan, Theofanous, Theo, Mitragotri, Samir   +2 more
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Action of melanophore-stimulating hormone on melanophores of the cyprinid fish Zacco temmincki

Comparative Biochemistry and Physiology Part C: Comparative Pharmacology, 1982
1. Alpha MSH was extremely effective in inducing melanosome dispersion in both innervated and denervated melanophores in isolated scales of Zacco termmincki. 2. The sensitivity of the melanophores to MSH did not change after denervation. 3. The MSH action was blocked by mersalyl, a SH inhibitor, but not by any of alpha and beta adrenergic blockers.
T, Iga, I, Takabatake
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Regulation of pigmentation in zebrafish melanophores

Pigment Cell Research, 2006
SummaryIn comparison with the molecular genetics of melanogenesis in mammals, the regulation of pigmentation in poikilothermic vertebrates is poorly understood. Mammals undergo morphological colour change under hormonal control, but strikingly, many lower vertebrates display a rapid physiological colour change in response to the same hormones.
Darren W, Logan, Sally F, Burn, Ian J, Jackson   +2 more
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Pharmacological studies on teleost melanophores

European Journal of Pharmacology, 1969
Abstract Thirty-three drugs have been administered to the pencil fish ( Nannostomus beckfordi anomalus ) to determine the nature of the innervation of the melanophores. The pencil fish showed pigment aggregation (paling) to all sympathomimetic drugs tested and pigment dispersal (darkening) when sympathetic transmission was blocked at any level.
N E, Ruffin, B L, Reed, B C, Finnin
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Melanophore differentiation in leaf frogs

Developmental Biology, 1978
Abstract In melanosomes of Pachymedusa (Agalychnis) dacnicolor and other leaf frogs, the pteridine dimer, pterorhodin, is found in fibers concentric to a kernel of eumelanin. The kernel is a remnant mature larval melanosome that is renovated at metamorphic climax and on which pterorhodin is deposited at the completion of metamorphosis.
J T, Bagnara, W, Ferris, W A, Turner, J D, Taylor   +3 more
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