The model's and Bergaust et al.'s[16] estimations of the fraction recruited to denitrification ().

*Refers to the initial values of O2 in the headspace () used in the simulations. The values show some inconsistency for the treatments corresponding to the same vol.% because of traces of O2 left behind after He-washing.** is the time when [O2] in the liquid falls below ( = 9.75 µM [22], the concentration below which recruitment of the cells to denitrification is assumed to trigger), and is the time when [O2] in the liquid falls below ( = 1 nM, a practically zero concentration below which the recruitment is assumed to terminate). Due to low cell density in the ∼0% O2 treatments, the O2 leakage into the vial during sampling (every 3 hours) caused oxygen concentration to exceed for 0.1–2.4 hours. This resulted in various recruitment spikes after the initial O2 was depleted. If such recruitment is omitted, = 0.126, 0.142, and 0.133 for the treatments 1, 2, and 3, respectively.The model's and Bergaust et al.'s[16] estimations of the fraction recruited to denitrification ().