TABLE 1 .
Physiological characteristics of isolated or enriched NOB in the candidate genus “Candidatus Nitrotoga”a
| “Ca. Nitrotoga” strain | Temp optimum (°C) | pH optimum | Nitrite concn tolerated (mM) |
Nitrate concn tolerated (mM) |
Km(app) NO2− (µM) |
|---|---|---|---|---|---|
| “Ca. Nitrotoga fabula” KNB (isolate) |
24 to 28 (poor activity at <20) |
7.1 to 7.6 | Max. concn ND (activity at 1 to 30) |
≤25 | 89.3 ± 3.9 |
| “Ca. Nitrotoga arctica” 6680 (enrichment)b |
10 | ND (cultured at 7.4 to 7.6) |
<1.2 | ND | 58 ± 28 |
| “Ca. Nitrotoga” sp. strain HAM-1 (enrichment)c |
ND (cultured at 10 and 17) |
ND (cultured at 7.4 to 7.6) |
Max. concn ND (cultured at 0.3) |
ND | ND |
| “Ca. Nitrotoga” sp. strain AM1 (enrichment)d |
16 | ND (cultured at 8.0 to 8.3) |
Max. concn ND (cultured at 0.7 to 2.6) |
ND | 24.7 ± 9.8 |
| “Ca. Nitrotoga” sp. strain HW29 (enrichment)e |
22 (40% of max. activity at 10) |
6.8 | <8 | ND | ND |
| Uncultured “Ca. Nitrotoga” in WWTPsf |
Activity at 4 to 27 | ND | Activity at 0.1 to 10 | ND | ND |