Isolation and characterization of Cr(VI) reducing Cellulomonas spp. from subsurface soils: implications for long-term chromate reduction

Bioresource Technology
Sridhar ViamajalaBrent M Peyton

Abstract

Microbial enrichments from Cr(VI) contaminated and uncontaminated US Department of Energy Hanford Site sediments produced Cr(VI) reducing consortia when grown in the presence of Cr(VI) with acetate, D-xylose or glycerol as a carbon and energy source. Eight of the nine isolates from the consortia were Gram positive and four of these were identified by 16S rRNA sequence homology and membrane fatty acid composition as belonging to the genus Cellulomonas. Two strains, ES6 and WS01, were further examined for their ability to reduce Cr(VI) under growth and non-growth conditions. During fermentative growth on D-xylose, ES6 and WS01 decreased aqueous Cr(VI) concentrations from 0.04 mM Cr(VI) to below the detection limit (0.002 mM Cr(VI)) in less than three days and retained their ability to reduce Cr(VI) even after four months of incubation. Washed ES6 and WS01 cells also reduced Cr(VI) under non-growth conditions for over four months, both with and without the presence of an exogenous electron donor. K-edge XANES spectroscopy confirmed the reduction of Cr(VI) to Cr(III). The ability to reduce Cr(VI) after growth had stopped and in the absence of an external electron donor, suggests that stimulation of these types of organisms may lead...Continue Reading

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Dec 20, 2011·Bioprocess and Biosystems Engineering·Yan ShiYuehun Chen
Jun 1, 2011·World Journal of Microbiology & Biotechnology·Sushma Deepthi ArliK C Patel
Jul 29, 2009·Applied Biochemistry and Biotechnology·Mathur Nadarajan KathiravanManickam Velan
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Sep 8, 2021·Journal of Microbiology and Biotechnology·Anamika KhanalJi-Hoon Lee

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