A) PAE of 15; B) PAE of 16; C) PAE of 17; D) PAE of 18; E) PAE of 19, F) PAE of 20. Cultures of E. coli ΔtolC (106 CFU/mL) were treated with 6 μM (8 μg/mL) PMBN and 0x, 8x, 16x, or 32x MIC of each inhibitor for 1 h followed by 1:1000-fold dilution into fresh cation-adjusted Mueller-Hinton (CaMH) media at 37 °C. Samples (100 μL) of the diluted cultures were then plated on Muller-Hinton agar plates every hour, and CFUs enumerated following incubation of the plates at 37 °C for 16 h. The experimental data points are the mean values from duplicate, independent measurements, and the error bars represent the standard deviation from the mean.