FIG. 1.

Biofilm formation by B. cereus ATCC 14579 and selected transposon mutants. (a) Biofilm formation was quantified by dislodging the biomass from the walls of glass beakers following static incubation in LB broth at 25°C for 72 h. The error bars indicate the standard deviations of the means (P < 0.01, n = 5). WT, wild type. (b to e) Stereophotomicrographs of biofilms of the wild type (b) and purA (c), purC (d), and purL (e) mutants on glass slides at the air-liquid interface. Scale bars = 2 mm.