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Liquid growth inhibition by nitrite and nitrate. Cultures of the aerobic T. thermophilus HB27 strain transformed with the indicated plasmid were grown for 24 h at 65 °C on TB medium with hygromycin (100 μg/ml) in the presence of the indicated concentrations of nitrite (a) or nitrate (b). The mean percentage of growth (OD600) of three different colonies respect to the controls without nitrogen oxide is represented
