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(A) Cell growth and Fe(II) oxidation by the enrichment culture with nitrate as the electron acceptor. (B) Fe(II) oxidation with nitrite as the electron acceptor. Data are presented as means ± standard deviations (SD) for triplicate cultures. Filled and open symbols represent results from inoculated and uninoculated cultures, respectively. • and ○, Fe(II); ▴ and ▵, nitrate; ▪ and □, nitrite; ×, cell numbers.
