ELECTROKINETIC STUDIES OF MARINE OVA. V. EFFECT OF PHCHANGES ON THE SURFACE POTENTIALS OF SEA-URCHIN EGGS

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Abstract
No isoelectric points were found in the unfertilized eggs of the sea-urchin Pseudo-centrotus depressus or in either unfertilized or fertilized eggs (with fertilization membrane) of Anthocidaris crassispina when the pH was changed down to 2 in sea water. In all these cases, the maxima occur in the neighborhood of neutrality; consequently, in natural sea water (pH 8.2), the absolute magnitude of the potential is below the highest level. Fertilized eggs carry a less negative potential than unfertilized eggs. The data are discussed in connection with the sperm potentials and their changes in egg water reported by Mudd et al.

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