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Related Experiment Videos

The visual pigment cyanide effect.

F Crescitelli, B Karvaly

    Photochemistry and Photobiology
    |December 1, 1989
    PubMed
    Summary
    This summary is machine-generated.

    Tokay gecko visual pigments shift spectra with chloride ions, unlike other rhodopsins. Cyanide degrades these gecko and other visual pigments, forming a 340 nm product.

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    Purification and low temperature spectroscopy of gecko visual pigments green and blue.

    Biochemistry·1995

    Area of Science:

    • Biochemistry
    • Vision Science
    • Molecular Biology

    Background:

    • Visual pigments are crucial for light detection.
    • Tokay gecko visual pigment exhibits unique spectral properties.
    • Halide ions influence visual pigment spectral characteristics.

    Purpose of the Study:

    • To investigate the spectral properties of Tokay gecko visual pigment.
    • To compare the behavior of gecko pigment with other rhodopsins.
    • To determine the effect of cyanide on visual pigments.

    Main Methods:

    • Spectrophotometry of extracted visual pigments.
    • Analysis of spectral shifts induced by halide ions.
    • Investigation of pigment degradation by cyanide.

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    Main Results:

    • Tokay gecko pigment spectral maximum shifts from 521 nm to 500-505 nm in chloride-deficient conditions.
    • Chloride or bromide addition restores the 521 nm maximum.
    • Cyanide causes thermal degradation of gecko and other visual pigments, forming a 340 nm product.
    • Cyanide does not affect native pigment photosensitivity or spectral curves.

    Conclusions:

    • Tokay gecko visual pigment's spectral shift is unique among tested rhodopsins.
    • Cyanide degrades visual pigments, suggesting a reaction with the chromophore or apoprotein.
    • The 340 nm product indicates a specific reaction pathway involving cyanide.