FIG. 6.

(A) C fixation over time for strain FO10 grown in the presence of basaltic glass, pyrite (FeS₂), and FeS (open symbols), with corresponding control data for comparison. C fixation was greatest for the culture grown in the presence of basalt (∼0.22 μmol of C fixed/ml [total]). C fixations in the presence of FeS and FeS₂ were approximately equivalent, with a maximum of ∼0.08 μmol of C fixed/ml (total). (B) Cell growth data for strain FO10 grown in parallel cultures in the presence of basaltic glass, FeS₂, and FeS. Cell growth was highest in the presence of basalt; this was nearly double the cell yield achieved in the presence of FeS and FeS₂.