dear editor,<br />I ahve a quick question. In your edited version as shown in the following sentence below<br /><br />"Alteration as aggregated forms appears as concentrations of nano-TiO<sub>2</sub> increases, which then contribute to the toxicity.&nbsp;'<br /><br />Here I believe it should be written as follows.<br /><br />Alteration as aggregated forms appears as concentrations of nano-TiO<sub>2</sub> increase, which then contributes to the toxicity.<br /><br />Can you please check and let me know soon?<br /><br />thanks