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Fig. 4 | Biotechnology for Biofuels

Fig. 4

From: Less biomass and intracellular glutamate in anodic biofilms lead to efficient electricity generation by microbial fuel cells

Fig. 4

Intracellular concentrations of TCA-related metabolites in microbial cells growing on the MFC anode (MFC-1-anode, black bars; MFC-2-anode, white bars). Metabolite concentrations (µmol g-cell−1) were measured after 30 days (MFC-1) and 90 days (MFC-2) of operation. Error bars indicate the standard deviation. Shown are the metabolic flows of organic acids (formate, acetate, propionate, butyrate, and lactate), the flux from acetyl-CoA to pyruvate, as observed in G. sulfurreducens [36], and glutamate [51]. CoA, coenzyme A; FAD, flavin adenine dinucleotide; PYR, pyruvate; Fd, ferredoxin; MQ, menaquinone; Pi, phosphoric acid

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