[假单胞菌QJX-1对锰的氧化特性]
[Characterization of manganese oxidation by Pseudomonas sp. QJX-1].
作者信息
Zhou Na-Na, Bai Yao-Hui, Liang Jin-Song, Luo Jin-Ming, Liu Rui-Ping, Hu Cheng-Zhi, Yuan Lin-Jiang
出版信息
Huan Jing Ke Xue. 2014 Feb;35(2):740-5.
A manganese-oxidizing bacteria (QJX-1) was isolated from the soil of a manganese mine. It was identified as Pseudomonas sp. QJX-1 by 16S rDNA sequencing. Experimental results showed that the Pseudomonas sp. QJX-1 has a multi-copper oxidase gene CumA, which is an essential component for manganese oxidation by Pseudomonas sp. Under the condition of low initial inoculum level (D600, 0.020), 5.05 mg x L(-1 Mn2+ could be oxidized by QJX-1 within 48 h with a conversion rate of as high as 99.4%. In comparison with the eutrophic conditions, the oligotrophic condition dramatically increased the biological manganese oxidation rate. Biofilm formation by employing the quartz sand could further improve the oxidation rate of Mn2+. Based on these results, it is speculated that biological manganese oxidation in underground water treatment is comparatively high.
从锰矿土壤中分离出一株锰氧化细菌（QJX-1）。通过16S rDNA测序将其鉴定为假单胞菌属QJX-1。实验结果表明，假单胞菌属QJX-1具有多铜氧化酶基因CumA，这是假单胞菌属氧化锰的必需成分。在低初始接种量（D600，0.020）条件下，QJX-1在48小时内可氧化5.05 mg·L⁻¹的Mn²⁺，转化率高达99.4%。与富营养条件相比，贫营养条件显著提高了生物锰氧化速率。采用石英砂形成生物膜可进一步提高Mn²⁺的氧化速率。基于这些结果，推测地下水中生物锰氧化作用相对较高。
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