Figure 1From: Comparison of the killing effects between nitrogen-doped and pure TiO2 on HeLa cells with visible light irradiationComparison of ROS induced by TiO 2 and N-TiO 2 . Fluorescence measurements as a function of irradiation time to compare the productions of ROS and specific ROS in aqueous suspensions induced by TiO2 and N-TiO2: (a) total ROS, (b) O2·−/H2O2, and (c) OH · .Back to article page