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qRT-PCR on denitrification reductase genes of P. aeruginosa PAO1 under anoxic growth for 3 h in LB with 0 or 400 μM NO−3. Expression was normalized to the housekeeping gene rpoD. Values show fold change from 0 μM with theoretical median of 1. N = 6 with median. *p ≤ 0.05, **p ≤ 0.01.
