FIG. 3.

Survival of E. coli BH110, bearing or not bearing the pFPG60 plasmid. Cultures in the mid-exponential phase of growth in M9S medium were treated with 5 mM H₂O₂ for the indicated times (A) or pretreated with 1 mM dipyridyl for 20 min and then treated with 5 mM H₂O₂ for the indicated times (B). Values are means ± standard errors. ■, xthA nfo fpg strain; ○, xthA nfo fpg strain transformed with pFPG60.