Fig. 4From: The toxic effect of zinc oxide nanoparticles on the terrestrial slug Lehmannia nyctelia (Gastropoda-Limacidae)Photomicrograph of sections through the salivary gland of a untreated slugs showing three types of cells: (I) purple colored cells, (II) blue colored cells, and (III) vacuolated cells. b Slugs treated with 0.01 ZnO NPs showing: empty cells(EC). c Slugs treated with 0.02 ZnO NPs showing acidophilic cells with flattened marginal nuclei (arrows). d Slugs treated with 0.05 ZnO NPs showing spaces between cells (arrows)Back to article page