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(A) Temperature optima of highly enriched Nitrotoga sp. HW29 (●) and Nitrospira defluvii A17 (■) grown at pH 7.4. (B) Influence of the pH on growth of Nitrotoga sp. HW29 (●) incubated at 17°C and Nitrospira defluvii A17 (■) incubated at 28°C. NOB growth corresponds to the capability for nitrite consumption per day.
