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. 2016 Mar 21;6:23375. doi: 10.1038/srep23375

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(a–c) Signal ratio of 654-cm⁻¹ SERS peak (r₆₅₄) of E. coli of inoculum densities of 10⁶, 10⁷ and 10⁸ CFU/ml, respectively, after being treated with different concentrations of imipenem for 2 hrs.