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Viability count of gram-positive bacteria treated with SiO2–NH2–RB nanoparticles and controls. (a) S. epidermidis; (b) S. epidermidis + SiO2–NH2; (c) S. epidermidis + RB; (d) S. epidermidis + SiO2–NH2–RB; (e) S. aureus; (f) S. aureus + SiO2–NH2; (g) S. aureus + RB; (h) S. aureus + SiO2–NH2–RB.
