Figure 5From: The extracellular death factor (EDF) protects Escherichia coli by scavenging hydroxyl radicals induced by bactericidal antibioticsEffects of EDF and its mutants on the killing effects of DNA-damage agent, nalidixic acid, in E. coli. The final concentration of nalidixic acid (Nal) was 1 mg/mL. The incubation condition was at 37°C for 3 hours. Other methods were similar to the description in Figure 4. Data were presented as means ± S.D. (n = 4).Back to article page