Fig 7. Dispersal of mature biofilms of [P.] pneumotropica biotypes Jawetz (A) and Heyl (B) by sodium periodate.

The supernatants of 24 h old biofilms of the strains indicated along the x-axis were replaced for 2 h by buffer alone (black bars) or buffer containing 10 mM sodium periodate (grey bars). Biofilm quantity was then measured by a standard crystal violet assay and measuring the absorbance at 540 nm. Bars represent mean values + standard deviation of at least three independent experiments. Asterisks (*) designate a p-value <0.05 between the treated group and the corresponding control.