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Representative growth curves of Ruegeria pomeroyi DSS-3 and Roseovarius sp. 217 growing on TMA or ammonium as the sole nitrogen source. Controls were set up with no added nitrogen. (Insets) Activity of Tmm from the supernatant of the crude extract of R. pomeroyi DSS-3 and Roseovarius sp. 217 cultures, respectively. No enzyme activities were detected when ammonium was used as the sole nitrogen source. Error bars indicate SD of each experiment (n = 3).
