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Iron chelation increases survival of 1457 ΔADI. Strains 1457 and 1457 ΔADI were grown aerobically in TSB supplemented with 35 mM glucose and 5 mM arginine. Following 24 h of growth, 200 μM dipyridyl (DP) was added and culture viability assessed after 24, 48, 72, 96, and 120 h. The graph represents the ratio of log10-transformed cell populations of treated and untreated cultures (n = 3). *, P < 0.05. The arrow indicates the time at which dipyridyl was added.
