Superoxide production in <i>Burkholderia</i> sp. DNT upon exposure to DNT and naphthalene.

<p>Cultures of the wild-type strain, the Δ<i>dnt</i> strain and the <i>dntB</i>↑ strain were exposed to either DNT or naphthalene (Naph) at a final concentration of 0.5 mM for 3 h. Superoxide levels were determined <i>in vitro</i> by treatment of the cells with NBT, and the results were normalized to control conditions (in which cells were added with DMSO, the DNT and naphthalene solvent carrier). Different lowercase letters identify significant differences within treatments at <i>P</i><0.05 (ANOVA). Error bars represent SD (<i>n</i> = 4).