Fig. 3
From: Copper selects for siderophore-mediated virulence in Pseudomonas aeruginosa
The density (log10 CFU mL−1) of Pseudomonas aeruginosa populations incubated with copper for (A) two days + one day in the absence of copper, or (B) twelve days + one day in the absence of copper. Asterisks indicate significant differences between groups (*** = 0.001, ** = 0.01, * = 0.05, NS = non-significant), with the left value comparing the control to the low copper treatment, the middle value comparing the control to the high copper treatment and the right value comparing the low and high copper treatments