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Comparison of the SERS spectra of P. aeruginosa AUS 454 at three different bacterial densities ∼(b) 1.8 × 108, (c) 3.2 × 108, and (d) 1.6 × 109 CFU/mL. Spectra shown are averages of data acquired in triplicate and repeated over 3 days. Blank CRSC control (a) was included for comparison. Spectra shown are offset but with the same intensity scale.
