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Hexavalent Chromium Reduction And 16S RDNA Identification Of Bacteria Isolated From A Cr (VI) Contaminated Site

A. Das, Susmita Mishra
Published 2008 · Chemistry

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A Gram-positive, hexavalent chromium [chromate: Cr (VI)]-resistant & reducing bacterium, isolated from sukind chromite mines, jajpur, India, was identified as a Brevibacterium casei(Gene Bank Accession Number: EU781952) by gene sequence homology. The strain(designated as APD15) could tolerate chromium up to a maximum concentration of 500 ppm, at optimum temperature and pH 30C and 7 for maximum chromium reduction. Agar supplemented with 100g Cr (VI)/ml as K2Cr2O7 and 0.5% (w/v) dextrose used as a carbon source. The results of the study indicated removal of more than 94% chromium (VI) by Brevibacterium caseidetermined by diphenylcarbazide colorimetric assay.
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