NDLI: Chromate reduction by Bacillus megaterium TKW3 isolated from marine sediments

Content Provider	Springer Nature Link
Author	Cheung, K. H. Gu, Ji Dong
Copyright Year	2005
Abstract	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 Cr$^{6+}$ (as CrO42−) into almost non-toxic and insoluble Cr$^{3+}$ under aerobic conditions. Complete reduction of 0.20 mM Cr$^{6+}$ by B. megaterium TKW3 was achieved within 360 h. Initial Cr$^{6+}$ concentration below 0.90 mM or inoculum less than 10$^{7}$ cells ml$^{−1}$ did not have significant effect on $^{6+}$ reduction, while the residue Cr$^{6+}$ concentration was the lowest at 10$^{7}$ cells ml$^{−1}$. Cr$^{6+}$ 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 Cr$_{2}$O72− 0.32 mM AsO43−, 0.58 mM SeO32− and 0.53 mM SeO42−, and reduced soluble Se$^{4+}$ (as SeO32−) to insoluble red amorphous Se$^{0}$. B. megaterium TKW3 might have potential application in bioremediation of Cr-laden sediments associated with other oxyanions.
Starting Page	213
Ending Page	219
Page Count	7
File Format	PDF
ISSN	09593993
Journal	World Journal of Microbiology and Biotechnology
Volume Number	21
Issue Number	3
e-ISSN	15730972
Language	English
Publisher	Kluwer Academic Publishers
Publisher Date	2005-01-01
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Bacillus megaterium bioremediation chromate reduction chromium metal resistance selenium Biotechnology Applied Microbiology Biochemistry Microbiology Environmental Biotechnology
Content Type	Text
Resource Type	Article
Subject	Physiology Medicine Applied Microbiology and Biotechnology Biotechnology

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