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Journal of Experimental Biology 61,697-703 (1974)
Published by Company of Biologists 1974

Diffusion and Permeation of Water in the Frog Egg: The Effect of Tension and Tonicity

KJELL HANSSON MILD 1 and SØREN LØVTRUP 2

1 Department of Theoretical Physics and Department of Zoophysiology, University of Umed S-901 87 Umed, Sweden
2 Department of Zoophysiology, University of Umed S-901 87 Umed, Sweden

1. The isotopic water permeability coefficient, P, of the plasma membrane of frog body cavity eggs has been determined as a function of the incubation time in media of different tonicity.

2. It was found that the permeability decreases with the incubation time in hypotonic solutions. The observed changes may be correlated with an increase of the tension in the vitelline membrane.

3. In the evaluation of the experimental results the diffusion of water in the external medium (‘unstirred layers’) is taken into account.

Submitted on June 14, 1974






© The Company of Biologists Ltd 1974