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ACTION SPECTRA FOR THE IRIDOPHORE LIGHT RESPONSE IN THE NEON TETRA
Author(s) -
Lythgoe J. N.,
Shand Julia
Publication year - 1984
Publication title -
photochemistry and photobiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.818
H-Index - 131
eISSN - 1751-1097
pISSN - 0031-8655
DOI - 10.1111/j.1751-1097.1984.tb04633.x
Subject(s) - chromatophore , action spectrum , absorbance , guanine , spectral line , neon , optics , chemistry , physics , photochemistry , atomic physics , biology , nucleotide , argon , astronomy , genetics , biochemistry , gene
The iridophores of some fishes such as the neon tetra ( Paracheirodon innesi ) are composed of alternating layers of guanine and cytoplasm. In the dark adapted state, the guanine layers are close together and reflect violet light. After illumination these layers separate and the iridophores reflect green light. The spacing change results from a direct action of light. Dose‐response curves show that more than one light sensitive mechanism are involved, but that at threshold the action spectrum fits a 461 nm porphyropsin absorbance curve.