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. 2020 Feb 26;20(5):1279. doi: 10.3390/s20051279

Figure 4.

Figure 4

(a) Nyquist plot for probe DNA (blue line), target DNA (yellow line), and non-complementary DNA (pink line) in Na-phosphate buffer 0.05 M containing 0.1 M NaCl at pH 7. (b) Proposed interaction between silica (positive charge) and DNA (negative charge) before and after the hybridization process on the electrode surfaces.