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Changes in the optical cell density at 500 nm of A. ferrooxidans inoculated in an Fe2+-ion free electrochemical rector under the potential static condition at +0.4 V vs. SHE (open triangle) and the open circuit condition (open square). Error bars indicate the standard error of the means calculated with data obtained from three individual experiments for the potential static condition and two individual experiments for the open circuit condition, respectively.
