Figure 6

Selenite and tellurite reduction by Duganella violacienigra. A) Typical violet pigments are visible when D. violacienigra was grown without Te (IV) or Se (IV) in the medium, B) Absence of color in sterile medium containing Se (IV), C) Red color in medium with Se (IV) indicating Se (IV) reduction, D) Absence of color in sterile medium containing Te (IV) and E) Black color indicating Te (IV) reduction by D.violacienigra.