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Oxidation of ammonium and formation of nitrite and nitrate in a microcosm containing spring water enriched with vitamins and trace elements. The inoculum consisted of the prokaryotic planktonic community of the FJQ, which was concentrated by filtration. Incubation was done in the dark at 40°C for a period of 38 days. •, ammonium; ▪, nitrite; ⧫, nitrate.
