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Anaerobic growth of strain MLHE-1 with nitrate as the electron acceptor and the inorganic electron donors hydrogen (A) and sulfide (B). Symbols: ▪, nitrate; □, nitrite; ▿, hydrogen; ▵, cells; ○, sulfide; •, sulfate. Symbols represent the means for three cultures, and error bars indicate ± 1 standard deviation.
