MULLINS Lj
J Gen Physiol. 1959 Mar 20;42(4):817-29. doi: 10.1085/jgp.42.4.817.
The influx of Na(+), K(+), Rb(+), and Cs(+) into frog sartorius muscle has been followed. The results show that a maximum rate is found for K(+), while Na(+) and Cs(+) penetrate much more slowly. Similar measurements with Ca(++), Ba(++), and Ra(++) show that Ba(++) penetrates at a rate somewhat greater than that of either Ca(++) or Ra(++). All these divalent cations, however, penetrate at rates much slower than do the alkali cations. The results obtained are discussed with reference to a model that has been developed to explain the different penetration rates for the alkali cations.
已对蛙缝匠肌中钠(Na⁺)、钾(K⁺)、铷(Rb⁺)和铯(Cs⁺)的流入情况进行了跟踪研究。结果表明,钾(K⁺)存在最大流入速率,而钠(Na⁺)和铯(Cs⁺)的渗透则要慢得多。对钙(Ca²⁺)、钡(Ba²⁺)和镭(Ra²⁺)进行的类似测量表明,钡(Ba²⁺)的渗透速率略高于钙(Ca²⁺)或镭(Ra²⁺)。然而,所有这些二价阳离子的渗透速率都比碱金属阳离子慢得多。结合已开发的用于解释碱金属阳离子不同渗透速率的模型,对所得结果进行了讨论。