Figure 1

NPN influx and efflux analysis. (a) Result of the influx analysis; fluorescence intensity of NPN is presented as a function of time. The data are presented as the mean ± standard error of mean from triplicate experiments. (b) Efflux analysis. The arrow indicates the time of glucose addition. NPN, N-phenyl-1-naphthylamine; WT, wild-type strain; ΔbamB, outer membrane lipoprotein deletion mutant; ΔtolC, outer membrane efflux protein deletion mutant; ΔbamBΔtolC, bamB and tolC double deletion mutant.