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Effect of iron chelation on denitrification. NO3− reduction (A), N2O production (B), and N2 production (C) of ΔpqsA mutant. PQS, 2,2′-bipyridyl, and FeCl3 were added at final concentrations of 50 μM, 120 μM, and 100 μM, respectively. Data displayed are means ± standard deviations of three independent experiments.
