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Threshold fluorescence sensitivity assessment of NGQDs/ssDNA132 sensor for miR-132. Fluorescence of (a) NGQDs/ssDNA132S and (b) NGQDs/ssDNA132L mixed with miR-132 at the concentration ratios of 1:0.01 (orange), 1:0.1 (yellow), 1:0.25 (green), 1:0.5 (teal), 1:1 (light blue). Corresponding integrated spectral intensities shown as bar plots.
