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Summary The outward rectification of the K+ current in mesophyll cell protoplasts from trap-lobes ofDionaea muscipula was studied with the patch-clamp technique. The rectification had instantaneous and time-dependent components. Changes in [K+] i strongly affected the conductance voltage relation of the plasma membrane while changes in [K+] o had little effect on the relation. Thus, the outward rectification depends on the membrane voltage and the concentration of intracellular K+. Corresponding single-channel activities were observed both in the intact membrane (cell-attached recording) and in excised patches. The single-channel conductance was about 3.3 pS with symmetrical solutions containing 30mm K+.  相似文献   
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