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At least 631 records · Page 35Linked to original sources
PubMed1993

Electrogenic steps during electron transfer via the cytochrome bc1 complex of Rhodobacter sphaeroides chromatophores.

The results of the flash-induced electrometrical investigation on the functioning of the photosynthetic bacterial cytochrome bc1 complex are discussed. The data suggest possible arrangement of redox centers in the bc1 complex and propose that the total electrogenesis within the bc1 complex includes: (i) electron transfer between the low- and the high-potential cytochrome b hemes, (ii) proton binding by doubly reduced Q2- at ubiquinone reducing center 'C', and (iii) proton release on oxidation of QH2 at ubiquinol-oxidizing center 'Z'.

Cytochrome b Group↗
PubMed1982

Receptor mechanisms in fish chromatophores--V. MSH disperses melanosomes in both dermal and epidermal melanophores of a catfish (Parasilurus asotus).

1. Synthetic alpha-MSH was tested for its action on dermal and epidermal melanophores of the siluroid catfish. Parasilurus asotus. 2. MSH did not produce melanosome aggregation in these melanophores. 3. It was, however, very effective in bringing about pigment dispersion in dermal melanophores. 4. Epidermal melanophores were also responsive to MSH, although the rate and the degree of the response was smaller than those of the dermal melanophores. 5. A possible role of MSH in skin color changes in vivo is discussed.

Animals↗
PubMed1984

Receptor mechanisms in fish chromatophores--VI. Adenosine receptors mediate pigment dispersion in guppy and catfish melanophores.

Using the guppy, Lebistes reticulatus, and the siluroid catfish, Parasilurus asotus , the effects of purine and pyrimidine derivatives on the movement of melanophores were studied. All the substances tested did not aggregate pigment within melanophores. Adenosine and adenine nucleotides were very effective in dispersing melanosomes within the cell, although adenine itself lacked such action. Derivatives of other purines than adenine and of pyrimidines did not disperse melanosomes. The pigment dispersion induced by adenine derivatives was specifically antagonized by methylxanthines. It was concluded that adenosine receptors are present on the melanophore membrane, which take part in the darkening reaction of fishes.

Adrenergic beta-Antagonists↗