Fig. 2From: Impact of in vitro digested zinc oxide nanoparticles on intestinal model systemsRepresentative transmission electron microscopy (TEM) images of ZnO NP < 50 nm (upper row) and < 100 nm (lower row) during and after in vitro digestion. Samples were taken after the mouth, gastric, and intestinal phase and after 1:10 dilution of the intestinal juice with the cell culture medium. Orange scale bar: 250 nmBack to article page