Figure 3. Evaluation of silver nanoparticles formed by incubating filter-sterilized AgNO₃ with pre-autoclaved YEM medium under ambient conditions.

a–b: Alteration in color of YEM medium incubated in presence of 0, 0.1, 0.25 and 0.5 mM AgNO₃ after ∼8 h (a) and 72 h (b). c: UV-Vis absorption spectra of 0, 0.1, 0.25 and 0.5 mM AgNO₃ incubated with YEM medium for 72 h. d: TEM image of silver nanoparticles formed under ambient conditions.