Abstract
A microelectrode inserted into an egg of Psammechinus miliaris is found to exhibit 5–10 mV positivity to an indifferent electrode. With two microelectrodes inserted into an egg, a current flow through one of them does not usually shift the potential of the other. It is concluded that the tips of the electrodes have not penetrated the membrane. The membrane resistance was measured after passing a comparatively strong current through two electrodes inserted into the egg, probably resulting in local destruction of the part of the membrane in contact with the tip of the electrodes. The mean value of membrane resistance was 1350 ohm. cm 2 in eggs from the surface form, and 1700 in eggs from the deep-water form. It is concluded that plasma membrane resistance of the unfertilized egg is of this order of magnitude or possibly somewhat higher.
Published Version
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