Kolesnikov S S, Liubarskiĭ A L
Biofizika. 1984 Sep-Oct;29(5):786-9.
Potassium channels, uniformly distributed over the cell surface (0.5 channel/micron2) have been found in isolated fragments of plasma membranes of frog photoreceptor cells. Their conductance under symmetrical conditions (0.1 M KCl at both the membrane surfaces) is 72 +/- 6 pS for rods and 88 +/- 8 pS for cones. The channels are reversibly blocked by tetraethylammonium (TEA), Cs+, Rb+ at intra- and extracellular membrane surfaces. Half-inactivation of a channel occurs at concentrations of TEA, Cs+ and Rb+ at the intracellular surface 0.12, 2.2 and 3.9 mM, correspondingly.
钾通道均匀分布于细胞表面（每平方微米0.5个通道），已在蛙感光细胞质膜的分离片段中被发现。在对称条件下（膜两侧均为0.1M氯化钾），视杆细胞通道的电导为72±6皮西门子，视锥细胞通道的电导为88±8皮西门子。这些通道在细胞内膜表面和细胞外膜表面均可被四乙铵（TEA）、铯离子（Cs +）、铷离子（Rb +）可逆性阻断。细胞内表面的TEA、Cs +和Rb +浓度分别为0.12 mM、2.2 mM和3.9 mM时，通道发生半数失活。
