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SEM images of gram-negative bacteria, including E. coli and P. aeruginosa, showing their morphology after they were cultured with 0–2.0 mg/mL of nMgO for 24 hours. Scale bar: 5 µm with an original magnification of 5000x. (A) to (F) is E. coli, and (A)’ to (F)’ is P. aeruginosa. The bacteria showed similar morphology at 1.2–2.0 mg/mL of nMgO, and thus only one image at 1.2 mg/mL of nMgO for each bacterial type is shown as a representative for those at the higher nMgO concentrations.
