Figure 4From: Gold nanoparticles synthesized by Geobacillus sp. strain ID17 a thermophilic bacterium isolated from Deception Island, AntarcticaEvidence of enzymatic Au+3reduction in ID17. (A) OD at 540 nm using different concentrations of NADH (1, 5 and 10 mM); (B) NADH dependence for the HAuCl4 reduction concentration; colour intensity indicates gold nanoparticles formation; (C) Zymogram analysis of enzymes (indicated with arrows) involved in Au+3 reductase activity.Back to article page