The Journal of General Physiology
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The Journal of General Physiology, Vol 25, 765-775, Copyright © 1942 by The Rockefeller University Press

ARTICLE

ELECTRIC IMPEDANCE OF THE FROG EGG

Kenneth S. Cole 1 and Rita M. Guttman 1

1 From the Department of Physiology, College of Physicians and Surgeons, Columbia University, New York

Electrical impedance measurements were made upon unfertilized and fertilized eggs of the leopard frog, Rana pipiens, over a frequency range of 0.05 to 10 kc. Average values of 170 ohm cm.2 were obtained for the plasma membrane resistance of the egg, 2.0 µf/cm.2 for the plasma membrane capacity, 86° for the phase angle of the membrane, and 570 ohm cm. for the specific resistance of the interior. These values did not change upon fertilization. No spontaneous rhythmical impedance changes such as have been found by Hubbard and Rothschild in the trout egg were found in frog eggs.

Submitted on March 2, 1942


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