| The effect of ultraviolet light on the sodium and potassium composition of resting yeast cells. | |
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MedLine Citation:
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PMID: 13620889 Owner: NLM Status: OLDMEDLINE |
Abstract/OtherAbstract:
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The Na(+) and K(+) content of non-metabolizing yeast cells was determined before and after monochromatic ultraviolet (UV) irradiation. UV facilitated the uptake of Na(+) into and the loss of K(+) from the cells (net ion flux); the effect is greatest for the shortest wavelength employed (239 mmicro) and is partly dependent upon the presence of oxygen. The UV effect on net ion flux persists for at least 90 minutes during which tests were made and it occurs following dosages which are without measurable effect on colony formation. The UV effect on net ion flux is decreased by acidity and promoted by alkalinity. Addition of calcium ions in sufficient amount prevents the usual net ion flux changes observed in irradiated yeast. Increase in concentration gradient between the inside and the outside of the cell increases the net ion flux of irradiated yeast, Na(+) uptake leading K(+) loss in all cases. UV appears to act by disorganizing the constituents of the cell surface, permitting K(+) to leave the cell in exchange for Na(+). At low intensities of UV this ionic exchange approaches equivalence, but at higher intensities more Na(+) is taken up than K(+) is lost. Some evidence suggests that the Na(+) in excess over that exchanged for K(+) is adsorbed to charged groups produced by the photochemical effect of UV on the cell surface. |
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Authors:
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R T SANDERS; A C GIESE |
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Publication Detail:
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Type: Journal Article |
Journal Detail:
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Title: The Journal of general physiology Volume: 42 ISSN: 0022-1295 ISO Abbreviation: J. Gen. Physiol. Publication Date: 1959 Jan |
Date Detail:
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Created Date: 1959-12-01 Completed Date: 2000-07-01 Revised Date: 2010-09-21 |
Medline Journal Info:
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Nlm Unique ID: 2985110R Medline TA: J Gen Physiol Country: Not Available |
Other Details:
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Languages: eng Pagination: 589-607 Citation Subset: OM |
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| MeSH Terms | |
Descriptor/Qualifier:
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Potassium
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metabolism* Saccharomyces cerevisiae / radiation effects* Sodium / metabolism* |
| Chemical | |
Reg. No./Substance:
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7440-09-7/Potassium; 7440-23-5/Sodium |
| Comments/Corrections | |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
| Full Text | |
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Journal Information Journal ID (nlm-ta): J Gen Physiol ISSN: 0022-1295 ISSN: 1540-7748 Publisher: The Rockefeller University Press |
Article Information Download PDF  Copyright © Copyright, 1959, by The Rockefeller Institute Received Day: 20 Month: 5 Year: 1958 Print publication date: Day: 20 Month: 1 Year: 1959 Volume: 42 Issue: 3 First Page: 589 Last Page: 607 ID: 2194933 PubMed Id: 13620889 |
| THE EFFECT OF ULTRAVIOLET LIGHT ON THE SODIUM AND POTASSIUM COMPOSITION OF RESTING YEAST CELLS | |
| Raymond T. Sanders | |
| Arthur C. Giese | |
| From the Department of Biological Sciences, Stanford University |
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