Webb D J, Nuccitelli R
Comp Biochem Physiol A Comp Physiol. 1985;82(1):35-42. doi: 10.1016/0300-9629(85)90701-7.
The membrane potential of Rana pipiens eggs (-55.0 mV +/- 11.2(16)) was more likely to recover from impalement and was always more negative than that of eggs of Xenopus laevis (-19.3 mV +/- 4.2(68)). It was also much more negative than previously reported. Essentially similar membrane resistance changes were measured in the two frog species through fertilization and cleavage. Small transient depolarizations only associated with the onset of the fertilization potential in Xenopus could be prevented by hyperpolarizing the egg membrane prior to fertilization. Repolarization was variable and longer in Rana and often accompanied by large transient spontaneous depolarizations. Insemination time, the time between fertilization and cleavage and the first cleavage division cycle, were all about twice as long in Rana. Xenopus egg cleavage was invariably accompanied by pronounced transient hyperpolarizations that were essentially absent in Rana.
牛蛙卵的膜电位（-55.0 mV±11.2(16)）更有可能从刺入中恢复，并且始终比非洲爪蟾卵的膜电位更负（-19.3 mV±4.2(68)）。它也比先前报道的要负得多。在两种蛙类中，通过受精和卵裂测量到的膜电阻变化基本相似。在非洲爪蟾中，仅与受精电位开始相关的小的瞬时去极化可以通过在受精前使卵膜超极化来防止。牛蛙的复极化是可变的且持续时间更长，并且经常伴随着大的瞬时自发去极化。授精时间、受精与卵裂之间的时间以及第一次卵裂周期，在牛蛙中都大约是非洲爪蟾的两倍。非洲爪蟾的卵裂总是伴随着明显的瞬时超极化，而牛蛙中基本不存在这种情况。
