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Plant and Cell Physiology, 1985, Vol. 26, No. 6 1185-1193
© 1985

Article

Ionic Activity Gradients across the Surface Membrane of Cytoplasmic Droplets Prepared from Chara australis

Martin Reeves1, Teruo Shimmen and Masashi Tazawa2

Department of Botany, Faculty of Science, University of Tokyo Hongo, Tokyo 113, Japan

2To whom reprint requests should be addressed

The membrane potential and the ionic activity gradients of K+ and Cl– across the surface membrane of cytoplasmic droplets prepared from Chara australis internodal cells, were measured in high and low ionic strength bathing solutions using liquid ion exchange microelectrodes selective for K+ and Cl–. Our results indicate that K+ is close to electrochemical equilibrium whereas Cl– is not.

1 Present address: ICI Japan, Palace Hotel Annex Building, Marunouchi, Tokyo, Japan.

(Received May 7, 1985; Accepted July 3, 1985)
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