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Calibration curves of S. typhimurium (a) and L. monocytogenes (b) in the AuNPs-based ICAs and the appearance of test strips. Concentrations of bacterial cells were 3 × 107 (1), 1 × 107 (2), 3 × 106 (3), 1 × 106 (4), 3 × 105 (5), 1 × 105 (6), 3 × 104 (7), and 0 (8) cells/mL (n = 3).
