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Comparison of respiration-driven active transport of alkali cations from E. coli cells loaded with Na + or Li + showed that Li + could not be expelled from the cells like Na + . K + accumulation, which was fast in Na + -loaded cells, was strongly inhibited in Li + -loaded cells, despite high membrane potential and respiratory rate. When Li...
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...
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