ODDO A M, ESPOSITO M
J Gen Physiol. 1951 Jan;34(3):285-93. doi: 10.1085/jgp.34.3.285.
In the eggs of Arbacia lixula and Paracentrotus lividus an uptake of K occurs during the first 10 minutes following fertilization. Between 10 and 40 minutes K is then released. Both in Arbacia and in Paracentrotus the minimum point of the curve coincides with the nuclear streak stage. A maximum loss of 25 per cent in Arbacia and 20 per cent in Paracentrotus with respect to the amount present in the unfertilized eggs has been found. From 40 minutes up to 1 hour K undergoes a further increase and when the first cleavage sets in the same amount of K is present as in the unfertilized eggs. By treating the eggs with K-free artificial sea water it has been established that about 60 per cent of the K content of the eggs is in a non-diffusible condition. Also under such conditions the eggs when fertilized are able to take up even the very small amount of K present in the medium that was released by them prior to fertilization.
在光棘球海胆和地中海海胆的卵中，受精后的前10分钟会摄取钾。然后在10到40分钟之间钾会释放出来。在光棘球海胆和地中海海胆中，曲线的最低点都与核带阶段重合。相对于未受精卵中的钾含量，已发现光棘球海胆中钾的最大损失为25%，地中海海胆中为20%。从40分钟到1小时，钾含量进一步增加，当第一次卵裂开始时，钾的含量与未受精卵中的相同。通过用无钾人工海水处理卵，已确定卵中约60%的钾含量处于不可扩散状态。在这种条件下，受精后的卵甚至能够摄取它们在受精前释放到培养基中的极少量钾。
