Fig. 3From: Enhancing the insecticidal activity of new Bacillus thuringiensis X023 by copper ionsGrowth curve of Bacillus thuringiensis X023 in different mediums. Black line is the CK without any addition for the original fermentation medium, blue line is the CU, which was added the Cu2+ at a final concentration of 1 × 10–5 M, red line is the NI that the Ni2+ at a final concentration of 1 × 10–6 MBack to article page