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Examples of fluorescence images of GFP E. coli captured on the biofunctionalized GaAs surface of ZnO/GaAs biochips exposed to bacteria at (a) 103 CFU/mL, (b) 104 CFU/mL, (c) 105 CFU/mL, (d) 106 CFU/mL, (e) 107 CFU/mL, (f) 108 CFU/mL. Density of E. coli captured on the GaAs surface of the ZnO/GaAs biochip functionalized with antibodies against (g) B. subtilis (square symbols) or E. coli (circle and tringle symbols).
