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Colony micrographs of E. coli O157:H7 immobilized on mesoporous titania films functionalized with APTES–GA–anti-E. coli O157:H7-Ab, after exposure to different concentrations of E. coli O157:H7. (a) 106 CFU/mL; (b) 104 CFU/mL; (c) 102 CFU/mL; (d) 10 CFU/mL.
