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External morphology of untreated (A, C) and treated Staphylococcus aureus cells (B, D) visualized with SEM (A, B) and TEM (C, D), respectively. Big arrows indicate electron-dense AgNPs, whereas small arrows indicate swelling (scale bars of panels A, B =3 µm; panel C =2 µm; panel D =500 nm).
Abbreviations: AgNPs, silver nanoparticles; SEM, scanning electron microscopy; TEM, transmission electron microscopy.
