Fig. 4From: Comparative metabolic state of microflora on the surface of the anode electrode in a microbial fuel cell operated at different pH conditionsThe relative ratios of a ATP/ADP, b NADH/NAD+, and c NADPH/NADP+ in the microbial fuel cells (pH 7.0: black bars, pH 5.5: gray bars, and pH 4.0: white bars) were calculated based on the amounts of these metabolitesBack to article page