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THE KINETICS OF PENETRATION

THE KINETICS OF PENETRATION The exit of accumulated ammonia from the sap of Valonia macrophysa , Kütz., into normal (nearly ammonia-free) sea water, has been studied in light (alternation of daylight and darkness) and in darkness. Exit is always preceded by an induction period lasting 1 or more days. This is longer in darkness. After exit starts the rate is greater in light than in darkness. The pH of the sap drops off soon after the cells are exposed to normal sea water even before any definite decrease in the ammonia concentration of the sap has occurred. This suggests that the decrease in the pH is due to the loss of a very small amount of NH 3 or NH 4 OH without a corresponding gain of sodium as a base. In most cases sodium replaced the ammonia lost during exit, but there is some evidence that potassium may also replace ammonia. To account for the induction period it is suggested that other species than NH 4 X are concerned in the transport of ammonia, for example urea or amino acids. Footnotes Accepted: 30 December 1938 http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png The Journal of General Physiology Rockefeller University Press

THE KINETICS OF PENETRATION

Jacques, A. G.
The Journal of General Physiology , Volume 22 (4): 521 – Mar 20, 1939
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References (4)

Publisher
Rockefeller University Press
Copyright
© 1939 Rockefeller University Press
ISSN
0022-1295
eISSN
1540-7748
DOI
10.1085/jgp.22.4.521
Publisher site
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Abstract

The exit of accumulated ammonia from the sap of Valonia macrophysa , Kütz., into normal (nearly ammonia-free) sea water, has been studied in light (alternation of daylight and darkness) and in darkness. Exit is always preceded by an induction period lasting 1 or more days. This is longer in darkness. After exit starts the rate is greater in light than in darkness. The pH of the sap drops off soon after the cells are exposed to normal sea water even before any definite decrease in the ammonia concentration of the sap has occurred. This suggests that the decrease in the pH is due to the loss of a very small amount of NH 3 or NH 4 OH without a corresponding gain of sodium as a base. In most cases sodium replaced the ammonia lost during exit, but there is some evidence that potassium may also replace ammonia. To account for the induction period it is suggested that other species than NH 4 X are concerned in the transport of ammonia, for example urea or amino acids. Footnotes Accepted: 30 December 1938

Journal

The Journal of General Physiology – Rockefeller University Press

Published: Mar 20, 1939

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