Coefficients of determination (R²) of calibration curves generated from amino acid-dependent growth of the different amino acid biosensors tested.

Biosensor growth was determined either turbidometrically (OD600 nm) or by measuring GFP fluorescence emission (RFU).生物传感器（Biosensor）的生长情况可通过以下两种方式之一测定：一是采用比浊法，检测光密度600纳米（OD600 nm）；二是通过测量绿色荧光蛋白（GFP）的荧光发射强度，以相对荧光单位（RFU）作为计量指标。