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Sensitivity of strains to oxidants. Cultures grown in GYE were swabbed on LICM with various additions: 500 μM BCDS, 15 μM Cu, 500 μM BPDS, 15 μM Fe, and 15 μM Cu plus 15 μM Fe. Disks containing 10 μl of 30% H2O2 (A) or 15 μl of 10 mM plumbagin (B) were applied to the center of each plate. Three measurements of the diameter of the clear zones were made after 3 days of growth at room temperature (mean ± standard deviation).
