Fig. 3
From: Validation and calibration of a novel GEM biosensor for specific detection of Cd2+, Zn2+, and Pb2+
Absorbance at 600 nm over time for Cd2+-treated E.coli-BL21-pJET2.1-CadA/CadR-eGFP cells. Absorbance readings were measured at different time points (1–8 h) after treating cells with varying concentrations of Cd2+ ions (1 ppb, 2 ppb, 3 ppb, 4 ppb, 5 ppb, 6 ppb, 1 ppm and Cd2+-untreated) and compared to untreated cells. Each concentration is represented by a specific colour (blue, orange, ash, yellow, light blue, green, dark blue and brown) and the X-axis indicates time in hours. The Y-axis represents absorbance readings at OD = 600 nm. Error bars indicate standard deviations from three separate biological experiments