The light-dependent effect of external pH on the membrane potential of Nitella
The light-dependent effect of external pH on the membrane potential of Nitella
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外部pH值对Nitella膜电位的光依赖性影响
DOI：
10.1093/oxfordjournals.pcp.a074837
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发表时间：
1973
期刊：
影响因子：
--
通讯作者：
M. Senda
中科院分区：
文献类型：
--
作者：
K. Saito;M. Senda
在光照条件下，当pH值高于5.5时，柔曲丽藻和腋生丽藻的膜电位发生超极化，pH值低于8时，膜电位以30- 40 mV/pH的速率发生超极化。这种超极化在黑暗中大大降低。膜电位对低钾浓度的介质的外部pH敏感，而对钾浓度相对不敏感。在高浓度的介质中，它是敏感的钾浓度，膜变得对外部pH值不敏感。从pH值敏感的pH值不敏感的状态发生的转变，而突然增加外部钾浓度。
In the light the membrane potential ofNitella flexilisandNitella axilliformiswas hyperpolarized by raising the external pH above pH 5.5, at the rate of 30–40mV/pH below pH 8. This hyperpolarization was largely reduced in the dark.The membrane potential was sensitive to the external pH of media with a low potassium concentration, where it was relatively insensitive to potassium concentration. In media of a high concentration where it was sensitive to the potassium concentration, the membrane became insensitive to the external pH. The transition from a pH-sensitive to a pH-insensitive state occurred rather abruptly on increasing the external potassium concentration.