FIG. 4.

As(III) chemolithoautotrophic growth by isolate AO5. (A) Culture cell density after 10 days of growth at 55°C with various amounts of As(III) (shown as initial concentrations). The cell number recorded for 0 mM As(III) reflects the starting inoculum cell density. (B) Growth of isolate AO5 (•) with 1 mM As(III). (▴), As(V) accumulating in culture medium during growth of isolate AO5. For both panels, data represent the mean of three replicate cultures, with error bars (where visible) representing 1 standard deviation.