FIG 5.

Steel coupon mass loss (A to C), nitrite concentrations (D to F), and lactate concentrations (G to I) in incubations of carbon steel coupons in minimal medium with 6 mM (A, D, and G), 3 mM (B, E, and H), or 1 mM (C, F, and I) nitrite with (blue) or without (red) lactate amendment. Green shapes in panel C show nitrite concentrations in incubation mixtures that did not contain steel coupons. Open shapes indicate incubation mixtures that included S. oneidensis, and closed shapes indicate uninoculated incubation mixtures. Error bars represent one standard deviation of data from triplicate incubations.