Fig. 2.

(a) Transformations of NO₃⁻, Fe²⁺, and acetate by Acidovorax sp. 2AN under mixotrophic (containing both Fe²⁺ and acetate) culture conditions. (b) Cell numbers. Nitrate was present in all of the replicates at an initial concentration of 5 mM. Fe²⁺ and acetate were present at initial concentrations of 8.3 and 1.6 mM, respectively. An additional 1.6 mM acetate was added on day 3. The data for heat-killed controls were similar to that shown in the supplemental material and is omitted for clarity. The data are presented as mean ± the standard deviations (n = 3). When not shown, error bars are smaller than the symbol size.