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Growth of E. coli cultures with various electron acceptors. Cultures were grown in M9 plus 0.2% glycerol under anaerobic conditions for 48 h in the presence of 10 mM carnitine, 40 mM nitrate, or carnitine plus nitrate as the available electron acceptors in the media. The data shown are representative of several experiments. Black bars, BW25113; gray bars; AW2A; open bars, AW1B.
