Fig. 3From: A label-free fluorescent biosensor based on specific aptamer-templated silver nanoclusters for the detection of tetracyclineOptical characterization of Apt76-AgNCs without (A) and with 10 µg/mL TET (B). Absorption (curve a), excitation (curve b), and emission (curve c) spectra of the as-prepared Apt76-AgNCs. C Circular dichroism (CD) spectra of Apt76 alone, Apt76-AgNCs without and with 10 µg/mL TET.Back to article page