Potassium Accumulation and Sodium Efflux by Porphyra perforata Tissues in Lithium and Magnesium Sea Water

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Potassium Accumulation and Sodium Efflux by Porphyra perforata Tissues in Lithium and Magnesium Sea Water

Cells of Porphyra perforata, a red marine alga, accumulate K in the absence of concomitant Na or Li extrusion while immersed in Li- or Mg-sea waters lacking Na. This suggests that the coupling observed between K and Na transport is facultative. No evidence is obtained for net extrusion of Li. Na efflux, with the concentration gradient, is facilitated by K and is proportional to the cellular Na ...

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Sodium Exclusion and Potassium Retention by the Red Marine Alga, Porphyra Perforata

Cells of the red marine alga, Porphyra perforata, accumulate potassium and exclude sodium, chloride, and calcium. Various metabolic inhibitors including dinitrophenol, anoxia, and p-chloromercuribenzoate partially abolish the cells' ability to retain potassium and exclude sodium. Iodoacetate induces potassium loss only in the dark; reduced sulfur compounds offer protection against the effects o...

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Potassium-dependent Sodium Extrusion by Cells of Porphyra Perforata, a Red Marine Alga

Potassium-free artificial sea water causes a loss of cell potassium and a gain of cell sodium in Porphyra perforata, which is not attributable to an inhibition of respiration. On adding KCl or RbCl to such low potassium, high sodium tissues, net accumulation of potassium or rubidium takes place, accompanied by net extrusion of sodium. Rates of potassium or rubidium accumulation and sodium extru...

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The Sodium and Potassium Content of Sea Water

EVER since the investigations of Forchhammer in the middle of last century it has been known that the composition of sea water throughout the mass of the oceans is relatively constant, and that, whatever be the degree of concentration or dilution, the ratios between the concentrations of the principal components vary, if at all, between narrow limits. Modern workers have not only confirmed this...

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Sodium, potassium and water metabolism in myxoedema.

In a combined radioactive isotope study, Nae, Ke, bromine space and total body water were measured in a group of fourteen hypothyroid subjects. These were compared with a 'control' group. Total body water and Nae were found to be increased in the hypothyroid subjects. In seven subjects, the measurements were repeated after treatment with thyroid hormone. Most of the subjects lost weight and sho...

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ژورنال

عنوان ژورنال: Journal of General Physiology

سال: 1959

ISSN: 1540-7748,0022-1295

DOI: 10.1085/jgp.43.1.29