Microbial arsenic transformation pathways associated with a saline lake located in northern Mongolia were examined using molecular biological and culturing approaches. Bacterial 16S rRNA gene sequences recovered from saline lake sediments and soils were affiliated with haloalkaliphiles, including Bacillus and Halomonas spp. Diverse sequences of arsenate respiratory reductase (arrA) and a new group of arsenite oxidase (arxA) genes were also identified. Pure cultures of arsenate‐reducing Nitrincola strain and anaerobic arsenite‐oxidizing Halomonas strain were isolated. The chemoorganotrophic Halomonas strain contains arxA gene similar to that of a chemoautotrophic arsenite‐oxidizing Alkalilimnicola ehrlichii strain MLHE‐1. These results revealed the diversity of arsenic transformation pathways associated with a geographically distinct saline system and the potential contribution of arx‐dependent arsenite oxidation by heterotrophic bacteria.

中文翻译：

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在蒙古科夫斯高尔鉴定与碱性盐湖有关的厌氧亚砷酸盐氧化和减少砷酸盐的细菌。

使用分子生物学和培养方法研究了与蒙古北部盐湖相关的微生物砷转化途径。细菌的16S rRNA基因序列从盐湖沉积物和土壤与haloalkaliphiles被附属，包括回收的乙芽孢和ħ alomonas属。还确定了砷酸呼吸还原酶（arrA）的不同序列和一组新的砷酸氧化酶（arxA）基因。的砷酸盐还原纯培养Ñ itrincola应变和厌氧砷氧化ħ alomonas菌株中分离得到。化学有机营养的氢氧化铝菌株含有arxA类似于化能自养砷氧化的基因甲lkalilimnicola ehrlichii应变MLHE-1。这些结果揭示了地理上不同的盐水系统相关的砷转化途径的多样性和潜在贡献ARX通过异养菌依赖砷氧化。