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The differential change in the supernatant solution color formation following to the mixing with a solution of AgNO3 (1×10-3 M): A: AgNO3 solution (1 mM) only (as positive control), B: culture supernatant without AgNO3 (as negative control), C: supernatant mixed with AgNO3 1 mM after 6 h, D: supernatant mixed with AgNO3 1 mM after 24 h
