Fig. 1From: Advanced epithelial lung and gut barrier models demonstrate passage of microplastic particlesCharacterization of micro- and nanoplastic particles by scanning electron microscopy (SEM). Representative images of polystyrene (PS) spheres of 0.05, 0.1, 1 and 10 μm, high density polyethylene (HDPE) fragments, the nylon fiber of 10 × 30 μm, car tire and ocean cleanup fragmentsBack to article page