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Uncovered TiO2 nanoparticles were shown to provide bactericidal activity against the three pathogens: Staphylococcus aureus, Escherichia coli, and Candida albicans at irradiation by blue (405 nm) light. It was found that the combination of a photocatalyst (TiO2‐nanoparticles) and a photosensitizer (methylene blue) at two‐wavelength irradiation with blue (405 nm) and red (625 nm) light provides a pronounced...