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Spectral sensitivity and visual pigments of the eye of the grass shrimp pandalus latirostris


, : Spectral sensitivity and visual pigments of the eye of the grass shrimp pandalus latirostris. Marine Biology Letters 2(4): 205-214

The spectral sensitivity of the eye of P. latirostris shows 2 peaks at 440 and 550 nm; these are distinct color receptors. Alternating equal quantum bursts of light at 450 and 560 nm for 10-12 min caused a sharp decline in the amplitude of the electroretinogram of the yellow-sensitive receptor, leading to complete loss of the signal: the blue-sensitive cells were little affected. The spectral sensitivity curve of the blue-sensitive receptor was in good agreement with the hypothetical pigment with .lambda.max 440 nm constructed by nomogram. The spectral sensitivity curve of the yellow-sensitive receptor was considerably narrower than the corresponding hypothetical rhodopsin and the visual pigment, extracted from the eye by digitonin. The rhabdom fraction and the digitonin extract of the receptor part of the eye of P. latirostris contained a considerable amount of red-brownish screening pigment, which prevented detection on the ordinary scale of optical density of photo-induced changes in the visual pigments. The use of differential spectrophotometry of high sensitivity enabled a single visual pigment with .lambda.max 520 nm to be found in the digitonin extracts and rhabdom suspension. During illumination this pigment was transformed into stable metarhodopsin with .lambda.max 500-510. Metarhodopsin was sensitive to hydroxylamine and bleached in its presence in the dark. Particulars of the properties of visual pigments and spectral sensitivity of the eye of P. latirostris are discussed.

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