Figure 5.

UV–vis adsorption spectra for aptasensor-based detection before and after the addition of E. coli O157:H7. From top to bottom are 108, 107, 106, 105, and 0 CFU/ml E. coli O157:H7.

Wu et al. Nanoscale Research Letters 2012 7:658   doi:10.1186/1556-276X-7-658
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