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Measurement of indicators of the redox metabolism during chemostat cultivations under carbon or nitrogen limitation in CON, NOX, and AOX. (A) Total specific NADH oxidation activity. (B) Ratio of intracellular NADH/NAD. Carbon-limited chemostats were operated at a dilution of 0.1 h−1 (white bars) or at the respective Dcrit (gray bars), and the nitrogen-limited chemostat (black bars) was operated at a dilution rate of 0.1 h−1.
