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Optical images of HeLa cells exposed to (A) ZnOAA20, (B) ZnOAA20(PAA), and (C) ZnOAA20(PLL), in DMEM without FBS; and (D) ZnOAA20, (E) ZnOAA20(PAA), and (F) ZnOAA20(PLL), in DMEM with FBS.
Notes: Exposed concentration of ZnO; 20 mg/L.
Abbreviations: FBS, fetal bovine serum; DMEM, Dulbecco’s Modified Eagle’s Medium; ZnOAA20, 20 nm ZnO; ZnOAA20(PAA), poly(acrylic acid)-coated, 20 nm ZnO; ZnOAA20(PLL), poly-L-lysine hydrochloride–coated, 20 nm ZnO.
