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The Journal of General Physiology, Vol 22, 757-773, Copyright © 1939 by The Rockefeller University Press

ARTICLE

THE KINETICS OF PENETRATION

XIX. ENTRANCE OF ELECTROLYTES AND OF WATER INTO IMPALED HALICYSTIS



A. G. Jacques 1

1 From the Laboratories of The Rockefeller Institute for Medical Research, New York, and The Bermuda Biological Station for Research, Inc., Bermuda

When cells of Halicystis are impaled on a capillary so that space is provided into which the sap can migrate, the rate of entrance of water and of electrolyte is increased about 10-fold. In impaled Valonia cells the rate is increased about 15-fold.

After a relatively rapid non-linear rate of increase of sap volume immediately after impalement (which may possibly represent the partial dissipation of the difference of the osmotic energy between intact and impaled cells) the volume increases at a linear rate, apparently indefinitely.

Since the halide concentration of the sap at the end of the experiment is (within the limits of natural variation) the same as in the intact cell, we conclude that electrolyte also enters the sap about 10 times as fast as in the intact cell.

As in the case of Valonia we conclude that there is a mechanism whereby in the intact cell the osmotic concentration of the sap is prevented from greatly exceeding that of the sea water. This may be associated with the state of hydration of the non-aqueous protoplasmic surfaces.

Accepted on February 10, 1939


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J. Gutknecht
Salt Transport in Valonia: Inhibition of Potassium Uptake by Small Hydrostatic Pressures
Science, April 5, 1968; 160(3823): 68 - 70.
[Abstract] [PDF]


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