Cr(Ⅲ) Is Indirectly Oxidized by the Mn(Ⅱ)-Oxidizing Bacterium Bacillus sp. Strain SG-1

KAREN J. MURRAY; BRADLEY M. TEBO

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Cr(Ⅲ) Is Indirectly Oxidized by the Mn(Ⅱ)-Oxidizing Bacterium Bacillus sp. Strain SG-1

机译：Cr（Ⅲ）被Mn（Ⅱ）-氧化细菌芽孢杆菌属菌间接氧化。 SG-1株

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Manganese oxides are the only known oxidants of Cr(Ⅲ) in the environment, and predictions of the fate of Cr(Ⅲ) have been based on Cr(Ⅲ) oxidation rates with well-characterized Mn(Ⅲ,Ⅳ) oxide minerals. Our research, however, indicates that the presence of Mn(Ⅱ)-oxidizing bacteria may accelerate these rates through the production of very reactive Mn oxides or intermediates formed in the oxidation process. Experiments with the Mn(Ⅱ)-oxidizing Bacillus sp. strain SG-1 show that this bacterium can accelerate Cr(Ⅲ) oxidation compared to both abiotic and biologically produced Mn oxides. Initial rates of Cr(Ⅲ) oxidation by biogenic oxides were approximately 7 times faster than Cr(Ⅲ) oxidation rates by equivalent amounts of synthetic δ-MnO_2 and 25 times faster by SG-1 spores with Mn(Ⅱ). Cr(Ⅲ) oxidation by SG-1 is not direct; Mn is required, but only in small amounts, indicating that it is recycled. Cr(Ⅲ) oxidation is inhibited above 5 μM dissolved Mn(Ⅱ), while Mn(Ⅱ) oxidation is not, suggesting that the processes are controlled by different mechanisms. These results illustrate the need to consider bacterial activity and the concentration of Mn when predicting the potential for Cr(Ⅲ) oxidation.

机译：锰氧化物是环境中唯一已知的Cr（Ⅲ）氧化剂，对Cr（Ⅲ）命运的预测是基于Cr（Ⅲ）氧化速率与特征明确的Mn（Ⅲ，Ⅳ）矿物的关系。然而，我们的研究表明，Mn（Ⅱ）-氧化细菌的存在可以通过产生非常活泼的Mn氧化物或在氧化过程中形成的中间体来加快这些速率。 Mn（Ⅱ）氧化芽孢杆菌的实验SG-1菌株表明，与非生物和生物产生的Mn氧化物相比，该细菌均可促进Cr（Ⅲ）氧化。与等量的合成δ-MnO_2相比，生物氧化物氧化Cr（Ⅲ）的初始速率比Cr（Ⅲ）的氧化速率快约7倍，而与Mn（Ⅱ）的SG-1孢子的初始速率相比则快25倍。 SG-1氧化Cr（Ⅲ）不是直接的。锰是必需的，但仅少量，表明可以回收。 Cr（Ⅲ）的氧化在5μM的溶解Mn（Ⅱ）以上受到抑制，而Mn（Ⅱ）的氧化没有抑制作用，表明该过程受不同机理控制。这些结果说明在预测Cr（Ⅲ）氧化潜力时需要考虑细菌活性和Mn的浓度。

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来源
《Environmental Science & Technology》 |2007年第2期|p.528-533|共6页
作者
KAREN J. MURRAY; BRADLEY M. TEBO;
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作者单位

Department of Geological and Environmental Sciences, Stanford University, Stanford, California 94305;

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收录信息美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
原文格式 PDF
正文语种 eng
中图分类环境化学;
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1. Indirect Oxidation of Co(II) in the Presence of the Marine Mn(II)-Oxidizing Bacterium Bacillus sp. Strain SG-1 [J] . Karen J. Murray, Samuel M. Webb, John R. Bargar, Applied and Environmental Microbiology . 2007,第21期

机译：在海洋Mn（II）-氧化细菌芽孢杆菌的存在下，Co（II）的间接氧化。 SG-1株
2. Indirect Uo_2 Oxidation By Mn(ii)-oxidizing Spores Of Bacillus Sp. Strain Sg-1 And The Effect Of U And Mn Concentrations [J] . SATYAVATHI CHINNI, CRAIG R. ANDERSON, KAI-UWE ULRICH, Environmental Science & Technology . 2008,第23期

机译：锰（ii）氧化芽孢杆菌孢子间接Uo_2氧化。 Sg-1菌株以及U和Mn浓度的影响
3. Localization of Mn(II)-oxidizing activity and the putative multicopper oxidase, MnxG, to the exosporium of the marine Bacillus sp strain SG-1 [J] . Francis CA., Casciotti KL., Tebo BM. Archives of microbiology . 2002,第6期

机译：Mn（II）氧化活性和假定的多铜氧化酶MnxG在海洋芽孢杆菌属菌株SG-1的外孢子中的定位
4. In-situ structural characterization of biogenic manganese oxides produced by Bacillus sp., strain SG-1 in seawater [C] . S.M. Webb, J.R. Bargar, B.M. Tebo International Symposium on Water-Rock Interaction(WRI-11) vol.2; 20040627-0702; Saratoga Springs,NY(US) . 2004

机译：芽孢杆菌属SG-1菌株在海水中产生的生物锰氧化物的原位结构表征
5. Rapid harvest of algae for biofuel production with the aggregating bacterium Bacillus sp. strain RP1137 [D] . Powell, Ryan Joseph 2014

机译：用聚集细菌芽孢杆菌快速收获藻类以生产生物燃料。 RP1137株
6. Cr(III) is indirectly oxidized by the Mn(II)-oxidizing bacterium Bacillus sp. strain SG-1 [O] . Karen J. Murray, Bradley M. Tebo -1

机译：Cr（III）被Mn（II）氧化细菌芽孢杆菌（Bacillus sp。）间接氧化。 SG-1株
7. Indirect Oxidation of Co(II) in the Presence of the Marine Mn(II)-Oxidizing Bacterium Bacillus sp. Strain SG-1▿ [O] . Murray, Karen J., Webb, Samuel M., Bargar, John R., 2007

机译：在海洋锰（II）-氧化细菌芽孢杆菌的存在下，Co（II）的间接氧化。菌株SG-1▿

Cr(Ⅲ) Is Indirectly Oxidized by the Mn(Ⅱ)-Oxidizing Bacterium Bacillus sp. Strain SG-1

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