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Fluorescence microscopy pictures of the abundance of Nitrosomonas AOB and Nitrospira NOB during the NOB enrichment. In green: cell hybridizing with probe NEU653 (targeting most halophilic and halotolerant Nitrosomonas spp.). In red: cells hybridizing with probe NTSPA712 (targeting most members of the phylum Nitrospirae). (A) Biomass after 1 month; (B) after 3 months; (C) after 6 months of operation with nitrite as the only substrate.
