Oöplasmic pH and electrical properties of developing locust (Locusta migratoria) eggs

Oöplasmic pH and the electrical potential difference across the egg coverings (PDegg) were measured in developing locust (Locusta migratoria) eggs with double-barrelled pH microelectrodes. Successful microelectrode impalements were obtained up to the ninth day of development, the day before hatching at 37°C. PDegg for eggs bathed in control saline changed substantially during development, from a minimum of −23 mV in day-1 eggs to a maximum of …