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ESR determination of hydroxyl radicals formed in cultures of S. aureus treated with hydrogen peroxide or antibiotics. Hydroxyl-radical signals were monitored in BHI (A) or TSB (B) medium (filled diamonds) or in cultures of S. aureus grown in the corresponding medium left untreated (open circles) or treated with 6 mM hydrogen peroxide (filled triangles), 2.5 μg/ml vancomycin (filled circles), or 0.4 μg/ml ciprofloxacin (filled squares). a.u., arbitrary units.
