Firmicutes orenia metallireducens菌株Z6所建议的在广泛的环境条件下控制铁还原和生物矿化的方法。,Environmental Science & Technology

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Firmicutes orenia metallireducens菌株Z6所建议的在广泛的环境条件下控制铁还原和生物矿化的方法。
Environmental Science & Technology ( IF 10.8 ) Pub Date : 2020-07-21 , DOI: 10.1021/acs.est.0c03853
Yiran Dong _{1,

2} , Robert A Sanford ₃ , Maxim I Boyanov _{4,

5} , Theodore M Flynn ₄ , Edward J O'Loughlin ₄ , Kenneth M Kemner ₄ , Samantha George ₆ , Kaitlyn E Fouke ₇ , Shuyi Li ₁ , Dongmei Huang ₁ , Shuzhen Li ₁ , Bruce W Fouke _{2,

3,

6}

Affiliation

微生物还原铁是一种普遍存在的生物地球化学过程，由多种环境中的多种微生物驱动。但是，通常很难在生物还原Fe（III）氧化物时将生物学与地球化学控制区分开。在这里，我们研究了使用单一异化铁还原剂Orenia metallireducens在广泛的环境条件下介导次生铁矿物质形成的主要驱动因素。Z6株。总共测试了17种不同的地球化学条件，它们具有不同的pH值（6.5–8.5），温度（22–50°C），盐度（2–20％NaCl），阴离子（磷酸盐和硫酸盐），电子穿梭（蒽醌2， 6-二磺酸盐）和Fe（III）氧化物矿物学（水铁矿，纤铁矿，针铁矿，赤铁矿和磁铁矿）。观察到的铁还原速率和程度不同，k _int在0.186和1.702 mmol L之间– ¹天^–1Fe（II）的生产量占初始Fe（III）的6.3％至83.7％。使用X射线吸收和散射技术（EXAFS和XRD），我们确定并评估了次生矿物与特定环境条件之间的关系。据推测，观察到的矿化途径的分叉可能是由剩余的Fe（III）矿物上不同程度的Fe（II）吸附程度介导的。这些结果扩大了我们对微生物铁还原过程中生物矿化控制方法的理解，并有助于实际应用的发展。

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Controls on Iron Reduction and Biomineralization over Broad Environmental Conditions as Suggested by the Firmicutes Orenia metallireducens Strain Z6.

Microbial iron reduction is a ubiquitous biogeochemical process driven by diverse microorganisms in a variety of environments. However, it is often difficult to separate the biological from the geochemical controls on bioreduction of Fe(III) oxides. Here, we investigated the primary driving factor(s) that mediate secondary iron mineral formation over a broad range of environmental conditions using a single dissimilatory iron reducer, Orenia metallireducens strain Z6. A total of 17 distinct geochemical conditions were tested with differing pH (6.5–8.5), temperature (22–50 °C), salinity (2–20% NaCl), anions (phosphate and sulfate), electron shuttle (anthraquinone-2,6-disulfonate), and Fe(III) oxide mineralogy (ferrihydrite, lepidocrocite, goethite, hematite, and magnetite). The observed rates and extent of iron reduction differed significantly with k_int between 0.186 and 1.702 mmol L^–1 day^–1 and Fe(II) production ranging from 6.3% to 83.7% of the initial Fe(III). Using X-ray absorption and scattering techniques (EXAFS and XRD), we identified and assessed the relationship between secondary minerals and the specific environmental conditions. It was inferred that the observed bifurcation of the mineralization pathways may be mediated by differing extents of Fe(II) sorption on the remaining Fe(III) minerals. These results expand our understanding of the controls on biomineralization during microbial iron reduction and aid the development of practical applications.

更新日期：2020-08-18

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