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Influence of pyoverdine on biofilm formation under iron limitation. Results are shown for biofilm formation (A550 of crystal violet as an indirect measure of biofilm biomass) by K1120 (▴) and a ΔpvdD strain, K1203 (▪), as a function of FeCl3 supplementation of an Fe-limited succinate minimal medium. Biofilms were grown for 12 h at 37°C. Error bars represent the standard errors of the means for a representative assay performed in triplicate.
