Fig. 3
P. aeruginosa tunes down the efflux of PVDI in the presence of environmental stresses. a Representative regular + fluorescent photos show that the amount of PVDI in the supernatant of bacterial cultures negatively relates to the concentration of tobramycin, where all the bacterial cultures were harvested at an identical bacterial density (O.D.600 = 0.3). b Decline of PVDI fluorescence intensity in the presence of different photon-stresses indicates that bacteria tune down the efflux of PVDI, where dots and lines represent the average intensities and the fitting lines using exponential fitting, respectively, with the magnitude of the photon-stress of 0.1, 0.15, 0.3, 0.6, 0.66, 0.72, 0.82, 1.2, 1.8, and 3.0\(\mathrm{mW} \, \mathrm{cm}^{ - 2}\), from bottom to top. c-e Photon-stress dependence of c \(\left( {\gamma + \mu } \right)\), d μ, and e \(\gamma /\mu\), where \(\gamma\) or μ represents the PVDI efflux rate or bacterial growth rate, respectively. The error bars in c–d are the standard deviation of experimental values
