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Relative levels of reactive oxygen species (ROS) detected using 2′,7′-dichlorodihydrofluorescein diacetate (DCFH-DA) staining in Scenedesmus obliquus (A) and Chlorella pyrenoidosa (B) exposed to single TiO2 NPs and TiO2 NTs at each EC10 or EC50 value, as well as TiO2 NPs + NTs at the EC10 or EC50 ratios. Statistical significance versus control group: * p < 0.05, ** p < 0.01, and *** p < 0.001.
