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(a) Fluorescence emission spectra of TPIP-FONs (5 μM) with/without 3×108 CFU mL-1 of S. aureus or E. coli. Excitation wavelength: 380 nm. (b) Fluorescence intensity of TPIP-FONs aqueous solution upon addition of varying amounts of S. aureus cells. (c) Fluorescence intensity (I-Io/Io) at 490 nm against concentrations of S. aureus cells.
