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The study reported here was conducted to determine the systemic oral toxicity and to find the no-observed-adverse-effect level of 20 nm positively charged zinc oxide (ZnO(SM20(+))) nanoparticles in Sprague Dawley rats for 90 days.

A 90-day study of sub-chronic oral toxicity of&nbsp;20&nbsp;nm positively charged zinc oxide nanoparticles in Sprague Dawley rats

A 90-day study of sub-chronic oral toxicity of 20 nm positively charged zinc oxide nanoparticles in Sprague Dawley rats