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Antibacterial activity exhibited by TiO2 nanoparticles and N-doped TiO2 nanoparticles against Gram-negative bacterial strains; (A) Pseudomonas aeroginosa, (B) Klebsiella pneumoniae, (C) Escherichia coli, (D) resistant Pneumococcal aeruginosa. Error bars are shown as standard deviation on each bar. Bars are significantly different at confidence interval level of 95%.
