Publisher Summary This chapter discusses the osmotic and ionic regulation in teleost eggs
and larvae. The teleost egg differs in one major respect from those of the polychaetes …

The fertilization reaction of echinoderm eggs (Lytechinus pictus, a sea urchin, and
Dendraster excentricus, a sand dollar) was followed with intracellular electrodes. Membrane …

Unfertilized Lytechinus variegatus eggs in sea water in their normal physiological state have
membrane potentials that approximate− 70 to− 80 mV. This conclusion is based on …

We have considered how a transient rise in calcium can occur and how it can result in the
activation of the egg. Our evidence with the “artificial sperm”—the ionophore‐coated glass …

The membrane potential of Xenopus eggs was monitored continuously from prior to
fertilization until early cleavage. A rapid decay of the initial potential of− 33.1±8.1 (SD) mV …

The membrane potential of the frog egg undergoes a transient positive shift at fertilization
which is a block to polyspermy. This paper addresses the question of how a sperm elicits …

The early events of fertilization that precede and cause activation of an egg have not been
fully elucidated. The earliest electrophysiological change in the sea urchin egg is a sperm …

Previous work has established that the polyspermy block in Urechis acts at the level of
sperm-egg membrane fusion.(J. Exp. Zool. 196: 105). Present results indicate that during the …

1. The current‐voltage relations of the oocyte membrane of the starfish, Asterina pectinifera,
and their changes during maturation were investigated using current‐clamp techniques. 2 …

Microelectrode and tracer flux studies of the Urechis egg during fertilization have shown:(a)
insemination causes a fertilization potential; the membrane potential rises from an initial …