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Photographs of E. coli colonies developed on agar plates treated with (A) control, (B) TiO2 and (C) N-doped TiO2 samples in the dark for 24 h. (a–c) are the images of E. coli colonies under visible light irradiation for 2 h. (a): control, (b): neat TiO2, and (c) N-doped TiO2. Reproduced with permission from [265]. Copyright Springer, 2013.
