Abstract
AbstractUsing liquid ion exchanger microelectrodes, we have measured the intracellular pH of unfertilized ascidian eggs. The pH in these eggs ranges from 7.1 to 7.6 (similar to values for fertilized sea urchin eggs) and does not change during the first 7 minutes of activation, whether induced by spermatozoa or by the Ca2+ ionophore A23187. Factors regulating metabolic derepression in regulative and mosaic eggs are discussed.
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