Figure 3From: Study on the visible-light-induced photokilling effect of nitrogen-doped TiO2 nanoparticles on cancer cells The cytotoxicities and the photokilling effects of pure TiO 2 and N-550-2 samples. With the concentration of 200 μg/mL on HeLa, QGY, and KB cells. The control groups were also shown for comparison.Back to article page