Abstract
Six chromium resistance bacteria (CrT-1, CrT-2, CrT-3, CrT-15, CrT-16, and CrT-17) were isolated from the effluents of tanneries (Din Garh, Kasur). Initially. they were selected on nutrient agar medium containing 1000 mug ml(-1) K2CrO4 Majority of them could tolerate upto 40-60 mg ml(-1) of K2CrO4. All of them were Cram-negative, motile rods. They form off-white circular and convex colonies with entire margin. They were facultative anaerobes. All of them were non spore former. The optimal temperature for them was 37 degreesC, both in the presence and absence of chromium salt. Ail of them could grow in pH range from 5 to 9, but majority of them preferred 7 or 8. They also conferred resistance to different antibiotics and metallic salts. Strains CrT-15 and CrT-16 were sensitive to streptomycin at 500 mug ml(-1).