FIG. 7.

A-NO₂⁻-mediated killing of P. aeruginosa PAO1 biofilms. Biofilms were grown as described for Fig. 6, except for the NaNO₂ concentrations in each sample. The − sign represents control biofilms, and those with a + sign were treated with 4,096 μg ml⁻¹ NaNO₂.