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Fluorescence of siderophore deficient P. aeruginosa strain PAO1 ΔpvdD ΔpchEF containing an iron regulated bfrB-gfp gene fusion incubated in direct contact with nontronite particles. (A) Representative transmission (left panels) and fluorescence (right panels) micrographs showing aggregation of bacteria with NAu-1 (top panels) and NAu-2 (bottom panels) particles. (B) Expression of GFP in individual cells determined from analysis of images captured by fluorescence microscopy.
