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. 2021 Nov 16;403:139581. doi: 10.1016/j.electacta.2021.139581

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Fig 4 — Calibration curves of ΔI vs concentration of SARS-CoV-2-S glycoprotein and BSA on MIP-Ppy and NIP-Ppy according to the ΔI calculated in respect to: A – the principal of ΔI measuring; B – ΔI. RSD% was in range from 2 to 4.3% of current values of 5 potential pulses for the listed data points.