Fig. 5.

Increase of fluorescence by oxidized dihydroethidium (DHE) in EAhy926 cells exposed to positive control and to different particles. Exposure times were 24 h to 100 μg/ml CPS particles in DMEM without FBS and to 200 μg/ml PPS20 particles in DMEM + 10% FBS and 24 h to 50 μg/ml CNTs in DMEM + 10% FBS. 200 μM H₂O₂ in DMEM without FBS served as positive control. Data are normalized to the respective controls (DMEM with or without FBS). Significant changes are indicated by asterisk. Scale bar: 20 μm.