4.7 Article

Bacillus flexus strain As-12, a new arsenic transformer bacterium isolated from contaminated water resources

期刊

CHEMOSPHERE
卷 169, 期 -, 页码 636-641

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PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.chemosphere.2016.11.129

关键词

Arsenic; Bioremediation; Bacillus flexus; Water resource

资金

  1. Kurdistan University of Medical Sciences [93/22]

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A total of 14 arsenic-resistant bacteria were isolated from an arsenic-contaminated travertine spring water in the central district of Qorveh county, Kurdistan Province, Iran. One of strains designated As-12 was selected for further investigation because of its ability to transform arsenic. The strain was identified by cultural, morphological and biochemical tests, and 16S rRNA gene sequencing. Finally, the growth characteristics of the isolate were investigated in a chemically defined medium which included varied ranges of environmental factors such as pH, temperature and salinity. Moreover, the resistance of this strain to some heavy metals was evaluated. The bacterium was a Gram-positive, endospore-forming with all other characteristics of the genus Bacillus. It revealed maximum similarity at the 16S rRNA gene level with Bacillus flexus. The optimum growth of the strain was observed at 38 degrees C, pH 9 and 2% salinity. This strain was resistant to heavy metals such as zinc, chromium, lead, nickel, copper, mercuric and cadmium at concentrations of 15 mM, 15.5 mM, 11.5 mM, 12 mM, 11 mM; 5.5 mM, and 1 mM, respectively. The isolated bacterium was able to reduce As (V) to As (III) (about 28%) and oxidize As (III) to As (V) (about 45%) after 48 h of incubation at 37 degrees C. In conclusion, Bacillus flexus strain As-12, was identified as an arsenic transformer, for the first time. (C) 2016 Elsevier Ltd. All rights reserved.

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