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A concept of a system is proposed for counting viruses (∼100 nm) and bacteria (∼1 µm) using a sensor array with microelectrodes that are almost the same size as the target. A finite element method simulation theoretically clarified that single targets can be detected using the microelectrode as an 8 % increase in resistance in impedance spectroscopy and a 10 % decrease in redox current in amperometry...
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