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Effects of ammonia on aceticlastic and syntrophic methanogenesis from acetate. The methane production rates of a pure culture of M. thermophila PT (open triangles), co-culture of T. phaeum PB and M. thermautotrophicus TM (filled squares), and tri-culture of the three strains (filled circles) are plotted against NH4Cl concentrations. Data are presented as the means of three independent cultures, and error bars represent standard deviations.
