2015年4月
Isolation and Characterization of Cr(VI)-Reducing Actinomycetes from Estuarine Sediments
APPLIED BIOCHEMISTRY AND BIOTECHNOLOGY
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- ,
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- 巻
- 175
- 号
- 7
- 開始ページ
- 3297
- 終了ページ
- 3309
- 記述言語
- 英語
- 掲載種別
- 研究論文(学術雑誌)
- DOI
- 10.1007/s12010-015-1501-x
- 出版者・発行元
- HUMANA PRESS INC
Bioremediation technologies have strong potential use in the less costly and more environmentally friendly removal of highly toxic hexavalent-chromium (Cr(VI)) compared with physicochemical technologies. Several Cr(VI)-reducing bacteria have been isolated; however, there are few studies on Cr(VI)-resistant and Cr(VI)-reducing actinomycetes. In this study, Cr(VI)-reducing actinomycetes were screened from estuarine, marine, and terrestrial samples on the basis of Cr(VI)-resistant and Cr(VI)-reducing ability. Of the 80 Streptomyces-like strains isolated, 20 strains were found to be resistant to 50 mg/l of Cr(VI). In addition, two strains isolated from the estuarine sediment of Tokyo Bay were found to be resistant to a concentration of 150 mg/l of Cr(VI). Furthermore, one Cr(VI)-reducing strain was found to remove 60 mg/l of Cr(VI) within 1 week and was identified as Streptomyces thermocarboxydus based on 16S rRNA gene analysis. The comparative evaluation with the type strain S. thermocarboxydus NBRC 16323 showed that our isolated strain had higher ability to grow at 27 A degrees C and reduce Cr(VI) at a NaCl concentration of 6.0 % at 27 A degrees C compared with the type strain NBRC 16323. These results indicate that our isolated strain have a potential ability to remove Cr(VI) from contaminated, highly saline sources without heating.
- リンク情報
- ID情報
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- DOI : 10.1007/s12010-015-1501-x
- ISSN : 0273-2289
- eISSN : 1559-0291
- PubMed ID : 25672321
- Web of Science ID : WOS:000351767200006