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Spectral Sensitivity of the Common Prawn, Palaemonetes vulgaris

The vision of Palaemonetes is of particular interest in view of extensive studies of the responses of its chromatophore systems and eye pigments to light. The spectral sensitivity is here examined under conditions of dark adaptation and adaptation to bright colored lights. In each case the relative...

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Autores principales: Wald, George, Seldin, Edward B.
Formato: Texto
Lenguaje:English
Publicado: The Rockefeller University Press 1968
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2201201/
https://www.ncbi.nlm.nih.gov/pubmed/5654406
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author Wald, George
Seldin, Edward B.
author_facet Wald, George
Seldin, Edward B.
author_sort Wald, George
collection PubMed
description The vision of Palaemonetes is of particular interest in view of extensive studies of the responses of its chromatophore systems and eye pigments to light. The spectral sensitivity is here examined under conditions of dark adaptation and adaptation to bright colored lights. In each case the relative number of photons per one-fiftieth sec flash needed to evoke a constant peak amplitude (usually 25 or 50 µv) in the electroretinogram (ERG) was measured at various wavelengths throughout the spectrum. The sensitivity is the reciprocal of this number. In dark-adapted animals the spectral sensitivity curve consists of a broad, almost symmetrical band, maximal at about 540 mµ, with a shoulder near 390 mµ. Adaptation to bright red or blue light, left on continuously throughout the measurements, depresses the 540 mµ peak without notably changing its shape or position, implying that only one visual pigment operates in this region. Adaptation to red light, however, spares a violet-sensitive system, so that a high, narrow peak at 390 mµ now dominates the spectral sensitivity function. The 540 and 390 mµ peaks are apparently associated with different visual pigments; and these seem to be segregated in different receptor systems, since the associated ERG's have markedly different time constants. It is suggested that these two sensitivity bands may represent the red- and violet-sensitive components of an apparatus for color differentiation.
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spelling pubmed-22012012008-04-23 Spectral Sensitivity of the Common Prawn, Palaemonetes vulgaris Wald, George Seldin, Edward B. J Gen Physiol Article The vision of Palaemonetes is of particular interest in view of extensive studies of the responses of its chromatophore systems and eye pigments to light. The spectral sensitivity is here examined under conditions of dark adaptation and adaptation to bright colored lights. In each case the relative number of photons per one-fiftieth sec flash needed to evoke a constant peak amplitude (usually 25 or 50 µv) in the electroretinogram (ERG) was measured at various wavelengths throughout the spectrum. The sensitivity is the reciprocal of this number. In dark-adapted animals the spectral sensitivity curve consists of a broad, almost symmetrical band, maximal at about 540 mµ, with a shoulder near 390 mµ. Adaptation to bright red or blue light, left on continuously throughout the measurements, depresses the 540 mµ peak without notably changing its shape or position, implying that only one visual pigment operates in this region. Adaptation to red light, however, spares a violet-sensitive system, so that a high, narrow peak at 390 mµ now dominates the spectral sensitivity function. The 540 and 390 mµ peaks are apparently associated with different visual pigments; and these seem to be segregated in different receptor systems, since the associated ERG's have markedly different time constants. It is suggested that these two sensitivity bands may represent the red- and violet-sensitive components of an apparatus for color differentiation. The Rockefeller University Press 1968-05-01 /pmc/articles/PMC2201201/ /pubmed/5654406 Text en Copyright © 1968 by The Rockefeller University Press This article is distributed under the terms of an Attribution–Noncommercial–Share Alike–No Mirror Sites license for the first six months after the publication date (see http://www.rupress.org/terms). After six months it is available under a Creative Commons License (Attribution–Noncommercial–Share Alike 4.0 Unported license, as described at http://creativecommons.org/licenses/by-nc-sa/4.0/).
spellingShingle Article
Wald, George
Seldin, Edward B.
Spectral Sensitivity of the Common Prawn, Palaemonetes vulgaris
title Spectral Sensitivity of the Common Prawn, Palaemonetes vulgaris
title_full Spectral Sensitivity of the Common Prawn, Palaemonetes vulgaris
title_fullStr Spectral Sensitivity of the Common Prawn, Palaemonetes vulgaris
title_full_unstemmed Spectral Sensitivity of the Common Prawn, Palaemonetes vulgaris
title_short Spectral Sensitivity of the Common Prawn, Palaemonetes vulgaris
title_sort spectral sensitivity of the common prawn, palaemonetes vulgaris
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2201201/
https://www.ncbi.nlm.nih.gov/pubmed/5654406
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