title: Comparative study of Cr(VI) uptake and reduction in industrial effluent by Ochrobactrum intermedium and Brevibacterium sp.
abstract: Two chromium-resistant bacterial strains, CrT-1 and CrT-13, tolerant up to 40 mg K2CrO4 ml(-1) on nutrient agar, 25 mg ml(-1) in nutrient broth, and up to 10 mg ml(-1) in acetate-minimal media, were identified as Ochrobactrum intermedium and Brevibacterium sp., respectively, on the basis of 16S rRNA gene sequencing. Uptake of chromate was greater in living cells than in heat-killed on dried cells. CrT-1 reduced 82%, 28% and 16% of Cr(VI) at 100, 500, and 1000 microg ml(-1) after 24 h while CrT-13 reduced 41%, 14% and 9%. Other heavy metals at low concentrations did not affect these reductions. At 150 and 300 microg ml(-1) in an industrial effluent sample Cr(VI) was reduced by 87% and 71%, respectively, with CrT-1 and by 68% and 47% with CrT-13.
authors.affiliation: Department of Botany, University of the Punjab, Quaid-e-Azam Campus, Lahore, 54590, Pakistan.
authors.forename: Muhammad
authors.initials: M
authors.lastname: Faisal
authors.forename: Shahida
authors.initials: S
authors.lastname: Hasnain
mesh_terms: D001673:Biodegradation, Environmental; D001951:Brevibacterium / Q000145:classification / Q000254:growth & development / Q000378:metabolism*; D049109:Cell Proliferation; D002857:Chromium / Q000302:isolation & purification / Q000493:pharmacokinetics*; D007220:Industrial Waste / Q000517:prevention & control*; D008669:Metallurgy / Q000379:methods; D042041:Ochrobactrum / Q000145:classification / Q000254:growth & development / Q000378:metabolism*; D010084:Oxidation-Reduction; D013045:Species Specificity; D014874:Water Pollutants, Chemical / Q000493:pharmacokinetics*; D018508:Water Purification / Q000379:methods*
chemical_list: D007220:Industrial Waste; D014874:Water Pollutants, Chemical; D002857:Chromium