Figure 3.

Redox transformation capability of strain IITK SM2 qualitatively confirmed with silver nitrate test. Isolates were cultured in minimum salt media, and 10 mM glucose was used as the carbon source. Color precipitates were obtained by adding Tris-HCl (0.1 M; pH = 7.4) and AgNO₃. White precipitates were developed in the absence of any arsenic due to the formation of AgCl. Yellow [Ag₃AsO_3(s)] and brown precipitates [Ag₃AsO_4(s)] represent the presence of As(III) and As(V), respectively. Whereas As(III)^s and As(V)^s represent systems without any bacterial inoculation, The As(III)^I and As(V)^I represent systems with bacterial inoculation [1% (v/v); OD~ 1]. No background As(V) and As(III) was detected in MSM.