TABLE 1 

Physiological characteristics of isolated or enriched NOB in the candidate genus “Candidatus Nitrotoga”a

Ca. Nitrotoga” strainTemp optimum (°C)pH optimumNitrite 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 7.6Max. concn ND
(activity at 1 to 30)
≤2589.3 ± 3.9
Ca. Nitrotoga arctica”
6680 (enrichment)b
10ND (cultured at
7.4 to 7.6)
<1.2ND58 ± 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)
NDND
Ca. Nitrotoga” sp. strain
AM1 (enrichment)d
16ND (cultured at
8.0 to 8.3)
Max. concn ND
(cultured at 0.7 to 2.6)
ND24.7 ± 9.8
Ca. Nitrotoga” sp. strain
HW29 (enrichment)e
22 (40% of max.
activity at 10)
6.8<8NDND
Uncultured “Ca. Nitrotoga”
in WWTPsf
Activity at 4 to 27NDActivity at 0.1 to 10NDND
  • a Data for uncultured “Ca. Nitrotoga” in activated sludge are listed for comparison. Abbreviations: max., maximum; ND, not determined.

  • b Data from references 16 and 28.

  • c Data from reference 21.

  • d Data from reference 22.

  • e Data from reference 25.

  • f Data from reference 19.