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Zone of inhibition produced by different metal oxide nanoparticles against both Gram-positive and Gram-negative bacterial strains. Antibacterial activity of (A) ZnO; (B) CuO; and (C) Fe2O3 of bacterial strains (a), Escherichia coli, (b) Staphylococcus aureus, (c) Pseudomonas aeruginosa, and (d) Bacillus subtilis.
