Two Light-Induced Processes in the Photoreceptor Cells of Limulus Ventral Eye
The dark-adapted current-voltage (I-V) curve of a ventral photoreceptor cell of Limulus, measured by a voltage-clamp technique, has a high slope-resistance region more negative than resting voltage, a lower slope-resistance region between resting voltage and zero, and a negative slope-resistance re...
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| Format: | Online |
| Language: | English |
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The Rockefeller University Press
1971
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| Online Access: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2226039/ |
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pubmed-2226039 |
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pubmed-22260392008-04-23 Two Light-Induced Processes in the Photoreceptor Cells of Limulus Ventral Eye Lisman, J. E. Brown, J. E. Article The dark-adapted current-voltage (I-V) curve of a ventral photoreceptor cell of Limulus, measured by a voltage-clamp technique, has a high slope-resistance region more negative than resting voltage, a lower slope-resistance region between resting voltage and zero, and a negative slope-resistance region more positive than 0 v. With illumination, we find no unique voltage at which there is no light-induced current. At the termination of illumination, the I-V curve changes quickly, then recovers very slowly to a dark-adapted configuration. The voltage-clamp currents during and after illumination can be interpreted to arise from two separate processes. One process (fast) changes quickly with change in illumination, has a reversal potential at +20 mv, and has an I-V curve with positive slope resistance at all voltages. These properties are consistent with a light-induced change in membrane conductance to sodium ions. The other process (slow) changes slowly with changes in illumination, generates light-activated current at +20 mv, and has an I-V curve with a large region of negative slope resistance. The mechanism of this process cannot as yet be identified. The Rockefeller University Press 1971-11-01 /pmc/articles/PMC2226039/ /pubmed/5122373 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/). |
| repository_type |
Open Access Journal |
| institution_category |
Foreign Institution |
| institution |
US National Center for Biotechnology Information |
| building |
NCBI PubMed |
| collection |
Online Access |
| language |
English |
| format |
Online |
| author |
Lisman, J. E. Brown, J. E. |
| spellingShingle |
Lisman, J. E. Brown, J. E. Two Light-Induced Processes in the Photoreceptor Cells of Limulus Ventral Eye |
| author_facet |
Lisman, J. E. Brown, J. E. |
| author_sort |
Lisman, J. E. |
| title |
Two Light-Induced Processes in the Photoreceptor Cells of Limulus Ventral Eye |
| title_short |
Two Light-Induced Processes in the Photoreceptor Cells of Limulus Ventral Eye |
| title_full |
Two Light-Induced Processes in the Photoreceptor Cells of Limulus Ventral Eye |
| title_fullStr |
Two Light-Induced Processes in the Photoreceptor Cells of Limulus Ventral Eye |
| title_full_unstemmed |
Two Light-Induced Processes in the Photoreceptor Cells of Limulus Ventral Eye |
| title_sort |
two light-induced processes in the photoreceptor cells of limulus ventral eye |
| description |
The dark-adapted current-voltage (I-V) curve of a ventral photoreceptor cell of Limulus, measured by a voltage-clamp technique, has a high slope-resistance region more negative than resting voltage, a lower slope-resistance region between resting voltage and zero, and a negative slope-resistance region more positive than 0 v. With illumination, we find no unique voltage at which there is no light-induced current. At the termination of illumination, the I-V curve changes quickly, then recovers very slowly to a dark-adapted configuration. The voltage-clamp currents during and after illumination can be interpreted to arise from two separate processes. One process (fast) changes quickly with change in illumination, has a reversal potential at +20 mv, and has an I-V curve with positive slope resistance at all voltages. These properties are consistent with a light-induced change in membrane conductance to sodium ions. The other process (slow) changes slowly with changes in illumination, generates light-activated current at +20 mv, and has an I-V curve with a large region of negative slope resistance. The mechanism of this process cannot as yet be identified. |
| publisher |
The Rockefeller University Press |
| publishDate |
1971 |
| url |
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2226039/ |
| _version_ |
1611436950077571072 |