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Effects of extracellular K+ concentrations on the intracellular K+ concentration of E. coli and its K+ uptake system-deleted mutant strains. The HB-pBAD, TK-pBAD24, TK-BaPS, and TK-BtPS strains were grown for 12 h at 30 °C in modified TK2420 medium (pH 7.0) contained 7 mM or 12 mM KCl with 0.2% arabinose with shaking. K+ concentrations per cell were measured as described in the Materials and Methods section.
