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Transmission electron microscopy (TEM) images of E. coli bacteria unsliced (A–F) and sliced (G–L) without (A,G) and with the treatments of TiO2-NP 10A (B,H), TiO2-NP 25A (C,I), TiO2-NP 25AR (D,J), TiO2-NP 50A (E,K) and TiO2-NP 50R (F,L). Blue arrows, cells and red arrows, aggregated TiO2 NPs. Adapted from reference [216].
