Fig. 24From: The application of titanium dioxide, zinc oxide, fullerene, and graphene nanoparticles in photodynamic therapy[Taken from reference (Li et al. 2014)] a PpIX synthesis from 5-ALA or C60–5-ALA in tissues as a function of time. b Growth of tumors after PDT treatment (630 nm, 0.1 W/cm2, 0.5 min) with 5-ALA or C60–5-ALABack to article page