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(A) Microbial current by wild-type cells after 1 h (triangles), 5 h (circles), and 20 h (squares) of electrochemical cultivation at the indicated potentials. (B) Microbial current by wild-type cells just before (black squares) and after (white squares) the addition of malonic acid into the electrochemical system. (C) Microbial current by sdh deficient mutant cells after 20 h of electrochemical cultivation.
