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METABOLIC FACTORS INFLUENCING THE SODIUM AND POTASSIUM DISTRIBUTION IN ULVA LACTUCA

1. Methods for the use of the marine green alga, Ulva lactuca, in studies on electrolyte metabolism are described. 2. The effect of illumination and iodoacetate on the potassium and sodium content, as well as the influence of light and running sea water on the iodoacetate effect was investigated. Th...

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Autores principales: Scott, George T., Hayward, Hugh R.
Formato: Texto
Lenguaje:English
Publicado: The Rockefeller University Press 1953
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2147388/
https://www.ncbi.nlm.nih.gov/pubmed/13052903
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author Scott, George T.
Hayward, Hugh R.
author_facet Scott, George T.
Hayward, Hugh R.
author_sort Scott, George T.
collection PubMed
description 1. Methods for the use of the marine green alga, Ulva lactuca, in studies on electrolyte metabolism are described. 2. The effect of illumination and iodoacetate on the potassium and sodium content, as well as the influence of light and running sea water on the iodoacetate effect was investigated. The rate of exchange of cellular potassium ion for K(42) under conditions of light and dark at 20 and 30°C. was studied. 3. Ulva maintained in the dark for long periods loses some potassium and gains sodium, both effects being reversed upon illumination. The presence of 0.001 M iodoacetate in the dark causes a marked progressive loss of potassium and gain of sodium, phenomena which do not occur when the alga is illuminated. Evidence for the penetration of the inhibitor into the cell in the presence of light is presented. The iodoacetate effect on potassium and sodium content, once established, can be "washed out" of the alga when the plant is placed in light and running sea water without the inhibitor. Illumination and increased temperature each favor a more rapid exchange of tissue for environmental potassium ion. 4. In the interpretation of these findings it is emphasized that metabolic work, perhaps in the form of ion transports, must be done by the cell to compensate for the continual flow of potassium ion and sodium ion with their respective concentration gradients and thus maintain homeostasis within the cell. Evidence is presented which indicates separate mechanisms for the distribution of sodium and potassium in this organism. It is further suggested that the degradation of phosphoglyceric acid, an important glycolytic and photosynthetic intermediate, or one of the products of its metabolism supplied the energy for these ion transports(s). The role of permeability per se is considered.
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spelling pubmed-21473882008-04-23 METABOLIC FACTORS INFLUENCING THE SODIUM AND POTASSIUM DISTRIBUTION IN ULVA LACTUCA Scott, George T. Hayward, Hugh R. J Gen Physiol Article 1. Methods for the use of the marine green alga, Ulva lactuca, in studies on electrolyte metabolism are described. 2. The effect of illumination and iodoacetate on the potassium and sodium content, as well as the influence of light and running sea water on the iodoacetate effect was investigated. The rate of exchange of cellular potassium ion for K(42) under conditions of light and dark at 20 and 30°C. was studied. 3. Ulva maintained in the dark for long periods loses some potassium and gains sodium, both effects being reversed upon illumination. The presence of 0.001 M iodoacetate in the dark causes a marked progressive loss of potassium and gain of sodium, phenomena which do not occur when the alga is illuminated. Evidence for the penetration of the inhibitor into the cell in the presence of light is presented. The iodoacetate effect on potassium and sodium content, once established, can be "washed out" of the alga when the plant is placed in light and running sea water without the inhibitor. Illumination and increased temperature each favor a more rapid exchange of tissue for environmental potassium ion. 4. In the interpretation of these findings it is emphasized that metabolic work, perhaps in the form of ion transports, must be done by the cell to compensate for the continual flow of potassium ion and sodium ion with their respective concentration gradients and thus maintain homeostasis within the cell. Evidence is presented which indicates separate mechanisms for the distribution of sodium and potassium in this organism. It is further suggested that the degradation of phosphoglyceric acid, an important glycolytic and photosynthetic intermediate, or one of the products of its metabolism supplied the energy for these ion transports(s). The role of permeability per se is considered. The Rockefeller University Press 1953-05-20 /pmc/articles/PMC2147388/ /pubmed/13052903 Text en Copyright © Copyright, 1953, by The Rockefeller Institute for Medical Research 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
Scott, George T.
Hayward, Hugh R.
METABOLIC FACTORS INFLUENCING THE SODIUM AND POTASSIUM DISTRIBUTION IN ULVA LACTUCA
title METABOLIC FACTORS INFLUENCING THE SODIUM AND POTASSIUM DISTRIBUTION IN ULVA LACTUCA
title_full METABOLIC FACTORS INFLUENCING THE SODIUM AND POTASSIUM DISTRIBUTION IN ULVA LACTUCA
title_fullStr METABOLIC FACTORS INFLUENCING THE SODIUM AND POTASSIUM DISTRIBUTION IN ULVA LACTUCA
title_full_unstemmed METABOLIC FACTORS INFLUENCING THE SODIUM AND POTASSIUM DISTRIBUTION IN ULVA LACTUCA
title_short METABOLIC FACTORS INFLUENCING THE SODIUM AND POTASSIUM DISTRIBUTION IN ULVA LACTUCA
title_sort metabolic factors influencing the sodium and potassium distribution in ulva lactuca
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2147388/
https://www.ncbi.nlm.nih.gov/pubmed/13052903
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