Fig. 4From: Flexible nanopillar-based electrochemical sensors for genetic detection of foodborne pathogens a The gel electrophoresis image of milk-spiked E. coli O157:H7, b the NPE-based electrochemical responses to the milk-spiked E. coli O157:H7 concentration from 1.0 × 101 to 1.0 × 105 CFU and c the calibration curve. The tests were repeatedly conducted under same condition. The signal variation was presented in the error barBack to article page