Fig. 5
From: Anode-assisted electro-fermentation with Bacillus subtilis under oxygen-limited conditions
Maximum production yields (x-axis) associated with production rates (y-axis) under different conditions tested with oxygen, nitrate and anode as electron acceptors. In contrast to acetoin (neon green) and acetate (metallic violet), intermediate products 2,3-butanediol (crimson red) and lactate (light azure) concentrations declined during the experiments; therefore, only the highest production rates are shown