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Electrochemical potentials monitored during two in situ PRB colonization experiments at site U1, using 4 replicate stainless steel electrodes (black lines) and 2 replicate copper electrodes (gray lines), during 35 days in 2006 (a) and 18 days in 2007 (b). The data represent daily averages for electrochemical potentials recorded every 30 min for each electrode.
