Fig. 3.

Loss of viability in RAW 264.7 cells exposed to freshly mixed silver ions (closed circle) and silver ions formed from dissolution of 20 nm silver nanoparticles (open circle) (a). Loss of viability in RAW 264.7 cells exposed to silver ions (2.5 or 5 μg/mL) for 24 h aged in cell culture medium for various amounts of time before dosing to cells (b). Loss of viability was assessed 24 h post exposure for all experiments