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Title:
Isolation and characterization of a chromium-resistant bacterium Serratia sp. Cr-10 from a chromate–contaminated site.
Author: Zhang KD., Li FL. 2011.
Source: Appl Microbiol Biotechnol
Issued Date: 2011-05
Volume: 90, Issue:3, Pages:1163-1169
Keyword: Cr(VI) reduction – Serratia sp. – Batch reduction – Bioremediation
Subject: 生物资源::微生物资源
Abstract: A novel bacterium, Cr-10, was isolated from a chromium-contaminated site and capable of removing toxic chromium species from solution by reducing hexavalent chromium to an insoluble precipitate. Sequence analysis of 16S rRNA gene of strain Cr-10 showed that it was most closely related to Serratia rubidaea JCM 1240T (97.68%). Physiological and chemotaxonomic data also supported that strain Cr-10 was identified asSerratia sp., a genus which was never specially reported chromate-resistant before. Serratia sp., Cr-10 was tolerant to a concentration of 1,500 mg Cr(VI) L−1, which was the highest level reported until now. The optimum pH and temperature for reduction of Cr(VI) by Serratia sp. Cr-10 were found to be 7.0 and 37 °C, respectively. The Cr(VI) reduction was significantly influenced by additional carbon sources, and among them fructose and lactose offered maximum reduction, with a rate of 0.28 and 0.25 mg Cr(VI) L−1 h−1, respectively. The cell-free extracts and filtrate of the culture were able to reduce Cr(VI) while concentration of total chromium remained stable in the process, indicating that the enzyme-catalyzed mechanism was applied in Cr(VI) reduction by the isolate. Additionally, it was found that there was hardly any chromium on the cell surface of the strain, further supporting that reduction, rather than bioadsorption, plays a major role in the Cr(VI) removal.
Content Type: 期刊论文
URI: http://ir.qibebt.ac.cn/handle/337004/1243
Appears in Collections:微生物资源团队_期刊论文

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Recommended Citation:
Zhang KD., Li FL. 2011.. Isolation and characterization of a chromium-resistant bacterium Serratia sp. Cr-10 from a chromate–contaminated site.[J]. Appl Microbiol Biotechnol,2011,90(3):1163-1169.
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文件名: Isolation and characterization of a chromium-resistant bacterium Serratia sp. Cr-10 from a chromate-contaminated site.pdf
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