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Two chromium-resistant bacterial strains CrT-1 and CrT-13,which can tolerate K2 CrO4 up to 40 mg·mL-1 on nutrient agar,25 mg·mL-1 K2 CrO4 in nutrient broth,and up to 10 mg·mL-1 in acetate-minimal media,were used in this study.On the basis o