Fig. 6

Product yields (mol/e-mol), net consumption/production of acetate (mol/e-mol of syngas consumed) and final pH for each fermentation in enrichment at pH 5 with addition of acetate (20 mM). The maximum theoretical net consumption of acetate corresponds to 0.25 mol acetate consumed/e-mol of syngas consumed. The columns show the values for the fermentation transferred and the error bars indicate the corresponding values of the duplicate experiment. Additional information on substrate consumption can be found in the Additional file 1: Figure S8