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Images of E. coli obtained by SEM (a, c & e; scale bar = 1.0 μm) and TEM (b, d & f; scale bar = 0.1 μm) following treatment with culture medium MHB (control; a & b), compound 7d under the concentration 100 μg/mL for 4 h (c & d), 12 h (e & f).
