%0 Journal Article
%T Isolation of Cr(VI) reducing bacteria from industrial e uents and their potential use in bioremediation of chromium containing wastewater<br>
%A Ahmed Zahoor
%A Abdul Rehman
%A <br>
%J 环境科学学报(英文版)
%D 2009
%I 
%X The present study was aimed to assess the ability of Bacillus sp. JDM-2-1 and Staphylococcus capitis to reduce hexavalent chromium into its trivalent form. Bacillus sp. JDM-2-1 could tolerate Cr(VI) (4800 g/mL) and S. capitis could tolerate Cr(VI) (2800 g/mL). Both organisms were able to resist Cd2+ (50 g/mL), Cu2+ (200 g/mL), Pb2+ (800 g/mL), Hg2+ (50 g/mL) and Ni2+ (4000 g/mL). S. capitis resisted Zn2+ at 700 g/mL while Bacillus sp. JDM-2-1 only showed resistance up to 50 g/mL. Bacillus sp. JDM-2-1 and S. capitis showed optimum growth at pH 6 and 7, respectively, while both bacteria showed optimum growth at 37°C. Bacillus sp. JDM- 2-1 and S. capitis could reduce 85% and 81% of hexavalent chromium from the medium after 96 h and were also capable of reducing hexavalent chromium 86% and 89%, respectively, from the industrial e uents after 144 h. Cell free extracts of Bacillus sp. JDM-2-1 and S. capitis showed reduction of 83% and 70% at concentration of 10 g Cr(VI)/mL, respectively. The presence of an induced protein having molecular weight around 25 kDa in the presence of chromium points out a possible role of this protein in chromium reduction. The bacterial isolates can be exploited for the bioremediation of hexavalent chromium containing wastes, since they seem to have a potential to reduce the toxic hexavalent form to its nontoxic trivalent form.
%K bioremediation
%K Bacillus sp
%K JDM-2-1
%K Staphylococcus capitis<br>
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=3FF3ABA7486768130C3FF830376F43B398E0C97F0FF2DD53&cid=A7CA601309F5FED03C078BCE383971DC&jid=6CB1530875F53489BF1E81BD87B7F5E6&aid=45E77AEE42D9A09639C4892972F7B036&yid=DE12191FBD62783C&vid=659D3B06EBF534A7&iid=B31275AF3241DB2D&sid=725C082EB6FD280F&eid=45D68DF69BA881EC&journal_id=1001-0742&journal_name=Journalofenvironmentalsciences(China)&referenced_num=0&reference_num=42