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Microscopic views of the effects of silver nanoparticles (Ag-NPs) on metabolic activity of Leishmania tropica promastigotes in the dark: (A) parasites in the control group (not exposed to Ag-NPs), (B) the cytopathic effects of Ag-NPs at 150 μg/mL, and (C) the cytopathic effects of Ag-NPs at 200 μg/mL. Arrows in (A) indicate the formation of formazan crystals and in (B) and (C) indicate the clusters of Ag-NPs (magnification 40×).
