Fig. 9.

E. coli membrane influxers and effluxers have discriminatory fluorophore accumulation profiles. (a) Fluorophore uptake in the E. coli gene knockout strain yihN. Fluorescence signals are presented as the log₁₀ of ratios of the fluorescence from the yihN knockout cells (∆yihN) over the fluorescence signals from the reference cells (BW25113). x-axis: log₁₀ of the ratios (log₁₀=0). No difference against the reference strain would have had a ratio of 1 (log₁₀=0). (b) Fluorophore uptake in the E. coli gene knockout strain tolC. Fluorescence signals are presented as the log₁₀ of ratios of the fluorescence from the tolC knockout cells (∆tolC) over the fluorescence signals from the reference cells (BW25113). x-axis: log₁₀ of the ratios (log₁₀=0). No difference against the reference strain would have had a ratio of 1 (log₁₀=0). Boxplots are ordered by median (highest on top of the plot). The legend lists the concentrations used for each fluorophore.