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rdf:type |
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lifeskim:mentions |
umls-concept:C0015392,
umls-concept:C0023721,
umls-concept:C0031760,
umls-concept:C0037473,
umls-concept:C0178719,
umls-concept:C0205217,
umls-concept:C0392673,
umls-concept:C1176299,
umls-concept:C1547011,
umls-concept:C1704448,
umls-concept:C1879746
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pubmed:issue |
5
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pubmed:dateCreated |
1978-2-18
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pubmed:abstractText |
The effects of the intracellular iontophoretic injection of Na+ ions have been quantitatively compared with adaptation in ventral photoreceptors of Limulus. We find that: (a) both light adaptation and sodium injection are associated with a decrease in the variability of the threshold response amplitued; (b) both light adaptation and sodium injection are associated with a decrease in the absolute value of the temporal dispersion of the threshold response time delay; (c) the same template curve adequately fits the intensity response relationships measured under light adaptation and Na+ injection; (d) both light adaptation and Na+ injection produce a fourfold decrease in response time delay for a desensitization of 3 log units; (e) the time coures of light adaptation and dark adaptation is significantly faster than the onset of and recovery from desensitization produced by Na+ injection; (f) unlike local illumination, Na+ injection does not produce localized desensitization of the photoreceptor. These findings suggest that a rise in intracellular Na+ concentration makes at most only a minor contribution (probably less than 5%) to the total adaptation of these receptors in the intensity range we have examined (up to 3 log units above absolute threshold). However, changes in intracellular Na+ concentration may contribute to certain components of light and dark adaptation in these receptors.
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pubmed:commentsCorrections |
http://linkedlifedata.com/resource/pubmed/commentcorrection/591914-1114339,
http://linkedlifedata.com/resource/pubmed/commentcorrection/591914-1181378,
http://linkedlifedata.com/resource/pubmed/commentcorrection/591914-1194890,
http://linkedlifedata.com/resource/pubmed/commentcorrection/591914-1202354,
http://linkedlifedata.com/resource/pubmed/commentcorrection/591914-1202355,
http://linkedlifedata.com/resource/pubmed/commentcorrection/591914-14100964,
http://linkedlifedata.com/resource/pubmed/commentcorrection/591914-14205019,
http://linkedlifedata.com/resource/pubmed/commentcorrection/591914-14225259,
http://linkedlifedata.com/resource/pubmed/commentcorrection/591914-4423343,
http://linkedlifedata.com/resource/pubmed/commentcorrection/591914-4672007,
http://linkedlifedata.com/resource/pubmed/commentcorrection/591914-4689620,
http://linkedlifedata.com/resource/pubmed/commentcorrection/591914-5025746,
http://linkedlifedata.com/resource/pubmed/commentcorrection/591914-5025747,
http://linkedlifedata.com/resource/pubmed/commentcorrection/591914-5500731,
http://linkedlifedata.com/resource/pubmed/commentcorrection/591914-5576768,
http://linkedlifedata.com/resource/pubmed/commentcorrection/591914-5642315,
http://linkedlifedata.com/resource/pubmed/commentcorrection/591914-5806592,
http://linkedlifedata.com/resource/pubmed/commentcorrection/591914-5806593,
http://linkedlifedata.com/resource/pubmed/commentcorrection/591914-591913,
http://linkedlifedata.com/resource/pubmed/commentcorrection/591914-810540,
http://linkedlifedata.com/resource/pubmed/commentcorrection/591914-818341,
http://linkedlifedata.com/resource/pubmed/commentcorrection/591914-864432,
http://linkedlifedata.com/resource/pubmed/commentcorrection/591914-956089,
http://linkedlifedata.com/resource/pubmed/commentcorrection/591914-974224
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pubmed:language |
eng
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pubmed:journal |
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pubmed:citationSubset |
IM
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pubmed:chemical |
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pubmed:status |
MEDLINE
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pubmed:month |
Nov
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pubmed:issn |
0022-1295
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pubmed:author |
|
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pubmed:issnType |
Print
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pubmed:volume |
70
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pubmed:owner |
NLM
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pubmed:authorsComplete |
Y
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pubmed:pagination |
601-20
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pubmed:dateRevised |
2009-11-18
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pubmed:meshHeading |
pubmed-meshheading:591914-Action Potentials,
pubmed-meshheading:591914-Adaptation, Ocular,
pubmed-meshheading:591914-Animals,
pubmed-meshheading:591914-Dark Adaptation,
pubmed-meshheading:591914-Electric Stimulation,
pubmed-meshheading:591914-Horseshoe Crabs,
pubmed-meshheading:591914-Light,
pubmed-meshheading:591914-Membrane Potentials,
pubmed-meshheading:591914-Ocular Physiological Phenomena,
pubmed-meshheading:591914-Photoreceptor Cells,
pubmed-meshheading:591914-Sodium,
pubmed-meshheading:591914-Time Factors
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pubmed:year |
1977
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pubmed:articleTitle |
Increased intracellular sodium mimics some but not all aspects of photoreceptor adaptation in the ventral eye of Limulus.
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pubmed:publicationType |
Journal Article,
In Vitro,
Research Support, U.S. Gov't, P.H.S.
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