TABLE 2.

Sensitivity of the E. coli PhoU mutant (JHU-313) and the complemented strain to antibiotics and peroxide as measured by zone of inhibitiona

AntibioticConcentration (μg/ml)Inhibition zone size (mm) of indicated strain
W3110JHU-313JHU-313 containing pPhoUJHU-313 containing pVector
Ampicillin10035404045
2528353640
625303234
1.521252527
Gentamicin1025272831
222262430
0.520222229
0.114201722
Tetracycline5023323234
2523323234
12.522263034
Trimethoprim230423644
126383340
0.524313236
Norfloxacin432373644
230343540
0.527303135
0.124282729
Hydrogen peroxide (30%)30373946
  • a The sensitivity of bacterial strains to antibiotics or peroxide was determined by Kirby-Bauer's method.