Table 1. Maximal N2O production and N2O yields of N. viennensis, N. maritimus and N. multiformis under different oxygen conditions.
| Strain | NH4+ (mM) | O2 (%) | N2O max (μM)a | N2O yield (%)b |
|---|---|---|---|---|
| AOA | ||||
| N. viennensis | 1 | 21 | 0.80±0.08 | 0.09±0.00 |
| 10 | 0.81±0.05 | 0.09±0.01 | ||
| 3 | 0.61±0.04 | 0.08±0.01 | ||
| 0 | 0.66±0.06 | 0.07±0.00 | ||
| N. maritimus | 1 | 21 | 0.44±0.04 | 0.05±0.02 |
| 10 | 0.35±0.03 | 0.04±0.01 | ||
| 3 | 0.36±0.06 | 0.03±0.00 | ||
| 0 | 0.36±0.04 | 0.03±0.01 | ||
| AOB | ||||
| N. multiformis | 1 | 21 | 0.94±0.10 | 0.09±0.01 |
| 10 | 1.09±0.18 | 0.10±0.02 | ||
| 3 | 2.00±0.53 | 0.14±0.05 | ||
| 0 | 3.32±0.30 | 0.27±0.05 | ||
a
Maximal N2O value (μM) measured during growth.
b
N2O/NO2− ratio (%). Yields are calculated for the exponential growth phase only. Data represent average values of triplicate or quadruplicate experiments with standard deviations.