Figure 3.

Influence of selenite on tellurite reduction. Tellurite reduction (a), selenite reduction (b) and glucose degradation (c) when present concurrently. Reduction of Te (IV) in the absence of Se (IV) (d) and reduction of Se (IV) (e) during aerobic glucose degradation (f) in absence of Te (IV). Inset photo showing color change of medium (L to R) in first three flasks after tellurite + selenite-, tellurite- and selenite-reduction, respectively. Turbidity was observed in control (4^th flask) containing no chalcogens after growth of inoculum with glucose whereas the medium remained colorless in sterile controls (5^th and 6^th flask) containing only tellurite as well as tellurite + selenite, respectively.