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Downhill sodium efflux from right-side-out E. coli membrane vesicles was found to be stimulated by negative electric potential, as has been reported earlier [Bassilana et al., Biochemistry 23 (1984) 1015-1022], and in agreement with the concept of electrogenic Na + nH + antiporters with n > 1. However, sodium efflux was much more accelerated by positive electric potential, indicating...
The activation of inward-rectifying K + channels in guard cells at membrane potentials negative of the K + equilibrium potential is important for their cellular function as proton pump-driven K + uptake pathways during stomatal opening. In animal cells the voltage-dependence of inward-rectifying K + channels is produced to a large extent by intracellular magnesium...
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