Fig. 4From: Anode-assisted electro-fermentation with Bacillus subtilis under oxygen-limited conditionsB. subtilis grown in BES under the limited aeration condition with glucose as substrate and K3[Fe(CN)6] acting as a mediator. Current density and charge logged at a poised anode potential of 0.7 V a. Optical density and pH b, glucose, lactate, acetoin and 2,3-butanediol concentrations c–f were measured from reactors with applied potential [AP] and open circuit [OC]. Results without the addition of K3[Fe(CN)6] (Additional file 1: Fig. S5) are shown in Additional file 1. Results are based on average data of three biological replicates and standard deviations are represented as coloured area and error barsBack to article page