Fig. 5

Controlling manganese doping of ZnS quantum dots by engineered S. oneidensis JG3631 with the inducible expression of MtrCAB complex. a Chemically synthesized Mn doped ZnS NPs with varying optical properties, b the amount of the inducer (TMAO) regulating expression of MtrCAB complex that performs extracellular reduction, c relationship between Mn²⁺ concentration and the addition of TMAO, d biogenic Mn doped ZnS quantum dots with varying optical properties as a function of Mn²⁺ concentration [155].