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Hyperpolarization of a Barnacle Photoreceptor Membrane following Illumination
Membrane potential changes following illumination of a photoreceptor cell in the lateral ocellus of a barnacle (Balanus eburneus) were studied by means of intracellular recording and polarization techniques. Illumination produces a depolarizing response. When the illumination is terminated, the memb...
Autores principales: | , , |
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Formato: | Texto |
Lenguaje: | English |
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The Rockefeller University Press
1971
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2203121/ https://www.ncbi.nlm.nih.gov/pubmed/5576768 |
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author | Koike, H. Brown, H. Mack Hagiwara, S. |
author_facet | Koike, H. Brown, H. Mack Hagiwara, S. |
author_sort | Koike, H. |
collection | PubMed |
description | Membrane potential changes following illumination of a photoreceptor cell in the lateral ocellus of a barnacle (Balanus eburneus) were studied by means of intracellular recording and polarization techniques. Illumination produces a depolarizing response. When the illumination is terminated, the membrane potential temporarily becomes more negative than the resting potential prior to illumination. Although the amplitude of this postillumination hyperpolarization depends upon the intensity as well as the duration of the light pulse, the time course is fairly constant. The hyperpolarization is not associated with any significant membrane conductance increase and is abolished by 10(-5) M ouabain. It diminishes when the external Na or K ions are removed. An intracellular injection of Na ions produces a hyperpolarization similar to that following illumination. It is suggested that the postillumination hyperpolarization is produced by an electrogenic Na pump which is activated by the Na influx during illumination. |
format | Text |
id | pubmed-2203121 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 1971 |
publisher | The Rockefeller University Press |
record_format | MEDLINE/PubMed |
spelling | pubmed-22031212008-04-23 Hyperpolarization of a Barnacle Photoreceptor Membrane following Illumination Koike, H. Brown, H. Mack Hagiwara, S. J Gen Physiol Article Membrane potential changes following illumination of a photoreceptor cell in the lateral ocellus of a barnacle (Balanus eburneus) were studied by means of intracellular recording and polarization techniques. Illumination produces a depolarizing response. When the illumination is terminated, the membrane potential temporarily becomes more negative than the resting potential prior to illumination. Although the amplitude of this postillumination hyperpolarization depends upon the intensity as well as the duration of the light pulse, the time course is fairly constant. The hyperpolarization is not associated with any significant membrane conductance increase and is abolished by 10(-5) M ouabain. It diminishes when the external Na or K ions are removed. An intracellular injection of Na ions produces a hyperpolarization similar to that following illumination. It is suggested that the postillumination hyperpolarization is produced by an electrogenic Na pump which is activated by the Na influx during illumination. The Rockefeller University Press 1971-06-01 /pmc/articles/PMC2203121/ /pubmed/5576768 Text en Copyright © 1971 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 Koike, H. Brown, H. Mack Hagiwara, S. Hyperpolarization of a Barnacle Photoreceptor Membrane following Illumination |
title | Hyperpolarization of a Barnacle Photoreceptor Membrane following Illumination |
title_full | Hyperpolarization of a Barnacle Photoreceptor Membrane following Illumination |
title_fullStr | Hyperpolarization of a Barnacle Photoreceptor Membrane following Illumination |
title_full_unstemmed | Hyperpolarization of a Barnacle Photoreceptor Membrane following Illumination |
title_short | Hyperpolarization of a Barnacle Photoreceptor Membrane following Illumination |
title_sort | hyperpolarization of a barnacle photoreceptor membrane following illumination |
topic | Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2203121/ https://www.ncbi.nlm.nih.gov/pubmed/5576768 |
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