Chromate reduction by <Emphasis Type="Italic">Bacillus megaterium</Emphasis> TKW3 isolated from marine sediments |
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Authors: | K?H?Cheung Email author" target="_blank">Ji-Dong?GuEmail author |
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Institution: | (1) Laboratory of Environmental Toxicology, Department of Ecology Biodiversity, The University of Hong Kong, Pokfulam Road, Hong Kong SAR, PR China;(2) The Swire Institute of Marine Science, The University of Hong Kong, Shek O, Cape d’Aguilar, Hong Kong SAR, PR China |
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Abstract: | Summary Bacillus megaterium strain TKW3 was isolated from multiple-metal-contaminated marine sediments of Tokwawan, Hong Kong SAR. This facultative aerobe utilized arabinose, mannitol, N-acetylglucosamine, maltose, caprate, citrate, butyrate or lactate as the sole source of carbon and energy for growth.B. megaterium TKW3 reduced highly toxic and soluble Cr6+ (as CrO42−) into almost non-toxic and insoluble Cr3+ under aerobic conditions. Complete reduction of 0.20 mM Cr6+ by B. megaterium TKW3 was achieved within 360 h. Initial Cr6+ concentration below 0.90 mM or inoculum less than 107 cells ml−1 did not have significant effect on 6+ reduction, while the residue Cr6+ concentration was the lowest at 107 cells ml−1. Cr6+ reduction by this strain was inhibited by high levels of NaCl (55%). B. megaterium TKW3 was also resistant to other oxyanions including 0.34 mM Cr2O72− 0.32 mM AsO43−, 0.58 mM SeO32− and 0.53 mM SeO42−, and reduced soluble Se4+ (as SeO32−) to insoluble red amorphous Se0. B. megaterium TKW3 might have potential application in bioremediation of Cr-laden sediments associated with other oxyanions. |
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Keywords: | Bacillus megaterium bioremediation chromate reduction chromium metal resistance selenium |
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