Fig 2: PSA detection. (a) FL images at high PSA concentrations from 40 µg/mL to 0 g/mL (from left to right, respectively). The target PSA was diluted using the sample diluent buffer. (b) and (c) Detection curves of high-concentration PSA diluted with the sample diluent buffer and human serums, respectively. These are presented on a log-log scale. Dashed curves represent fitted curves by the Hill equation (Equation (1)). (d,e) Detection curves of PSA diluted with the sample diluent buffer and human serums, respectively, presented on a semi-log scale. Dashed curves are fitted curves using the Hill equation. The target concentrations were in a range from 4.0 ng/mL to 0 g/mL. Insets magnify a range near 0 g/mL, presented on a linear scale.