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Bacterial taxonomic composition analysis after exposure to nickel oxide nanoparticles (NiO NPs). Bacterial taxonomic assignment was at the phylum level and samples were compared according to NiO NPs concentrations at 1 day and 4 weeks after instillation. NiO NPs induced the change in lung microbial composition in rats at 1 day after instillation. C: control group; L: low-dose group (50 cm2/rat); H: high-dose group (150 cm2/rat).
