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首页> 外文期刊>Applied and Environmental Microbiology >Indirect Oxidation of Co(II) in the Presence of the Marine Mn(II)-Oxidizing Bacterium Bacillus sp. Strain SG-1
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Indirect Oxidation of Co(II) in the Presence of the Marine Mn(II)-Oxidizing Bacterium Bacillus sp. Strain SG-1

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

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摘要

Cobalt(II) oxidation in aquatic environments has been shown to be linked to Mn(II) oxidation, a process primarily mediated by bacteria. This work examines the oxidation of Co(II) by the spore-forming marine Mn(II)-oxidizing bacterium Bacillus sp. strain SG-1, which enzymatically catalyzes the formation of reactive nanoparticulate Mn(IV) oxides. Preparations of these spores were incubated with radiotracers and various amounts of Co(II) and Mn(II), and the rates of Mn(II) and Co(II) oxidation were measured. Inhibition of Mn(II) oxidation by Co(II) and inhibition of Co(II) oxidation by Mn(II) were both found to be competitive. However, from both radiotracer experiments and X-ray spectroscopic measurements, no Co(II) oxidation occurred in the complete absence of Mn(II), suggesting that the Co(II) oxidation observed in these cultures is indirect and that a previous report of enzymatic Co(II) oxidation may have been due to very low levels of contaminating Mn. Our results indicate that the mechanism by which SG-1 oxidizes Co(II) is through the production of the reactive nanoparticulate Mn oxide.
机译：在水生环境中，钴（II）的氧化与锰（II）的氧化有关，锰（II）的氧化主要由细菌介导。这项工作检查了形成孢子的海洋锰（II）氧化细菌芽孢杆菌（Bacillus sp）对Co（II）的氧化作用。菌株SG-1，其以酶促方式催化反应性纳米微粒Mn（IV）氧化物的形成。将这些孢子的制剂与放射性示踪剂和各种量的Co（II）和Mn（II）一起孵育，并测量Mn（II）和Co（II）的氧化速率。发现通过Co（II）抑制Mn（II）氧化和通过Mn（II）抑制Co（II）氧化都具有竞争性。但是，从放射性示踪剂实验和X射线光谱学测量来看，在完全不存在Mn（II）的情况下都没有发生Co（II）氧化，这表明在这些培养物中观察到的Co（II）氧化是间接的，并且先前的报道酶促Co（II）氧化可能是由于极少量的Mn污染所致。我们的结果表明，SG-1氧化Co（II）的机理是通过反应性纳米微粒Mn氧化物的产生。

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