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Fluorescence microscopic images of E. coli incubated with nitrogen-doped carbon dots under (A) bright field, scale bar: 5 µm; (B) 405 nm, scale bar: 5 µm; (C) 470 nm, scale bar: 5 µm; (D) 560 nm, scale bar: 5 µm. Reproduced with permissions from [67].
