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a UV–Visible spectrum of (I) untreated Ag2O micropowder and (II) biotransformed Ag/Ag2O nanoparticles. The inset shows a glass vial containing untreated Ag2O solution before (glass vial on the left side) and after reaction with fungal biomass (glass vial on the right side). b FT-IR spectra of biotransformed silver/silver oxide nanoparticles
