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Effects of ammonia on the growth of M. thermophila PT in the tri-culture. Abundances of rRNA of M. thermophila PT in the mid-log phase of the tri-culture grown on acetate with different concentrations of NH4Cl were determined by qRT-PCR and normalized against that of the control cultures (5 mM NH4Cl). Data are presented as the means of three independent cultures, and error bars represent standard deviations.
