Biomineralization of Poorly Crystalline Fe(III) Oxides by Dissimilatory Metal Reducing Bacteria (DMRB)
Biomineralization of Poorly Crystalline Fe(III) Oxides by Dissimilatory Metal Reducing Bacteria (DMRB)
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DOI：
10.1080/01490450252864271
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发表时间：
2002-03
影响因子：
2.3
通讯作者：
J. Zachara;R. Kukkadapu;J. Fredrickson;Y. Gorby;Steven C. Smith
中科院分区：
文献类型：
--
作者：
J. Zachara;R. Kukkadapu;J. Fredrickson;Y. Gorby;Steven C. Smith
异化金属还原细菌（DMRB）在缺氧土壤、沉积物和地下水中催化铁（III）还原为铁（II）。双线水合铁是一种生物可利用的铁（III）氧化物形式，被DMRB利用作为终端电子受体。多种生物矿化产物是由DMRB与2线水合铁相互作用产生的。在这里，我们利用已发表的数据和新的实验结果，描述了通过DMRB实验室培养合成2线水合铁的生物转化的知识状态。强调了一种兼性DMRB（腐烂希瓦氏菌），大部分工作都是在它上面进行的。控制次级矿物组合的关键因素包括介质组成、电子供体和受体浓度、水合铁老化/再结晶状态、吸附离子和伴生铁（III）氧化物晶体。结果表明，在缺氧、环中性的DMRB培养中，形成了晶体铁（针铁矿、赤铁矿、绢云母）、铁（菱铁矿、橄榄铁矿）和混合价（磁铁矿、绿锈）铁固体。有些产物是基于热力学考虑而合理的，但其他产物似乎是由抑制界面电子转移的离子驱动的动力学途径或选择相的沉淀引起的。控制次生矿物组性质的主要因素是铁（II）供给速率和量级，以及其与残余氧化物和其他吸附离子的表面反应。对非整体平衡的最终产物矿物混合物的常见观察表明，呼吸DMRB细胞周围的微环境或反应路径轨迹（在Eh-pH空间上）可能影响最终生物矿化组合的特性。
Dissimilatory metal reducing bacteria (DMRB) catalyze the reduction of Fe(III) to Fe(II) in anoxic soils, sediments, and groundwater. Two-line ferrihydrite is a bioavailable Fe(III) oxide form that is exploited by DMRB as a terminal electron acceptor. A wide variety of biomineralization products result from the interaction of DMRB with 2-line ferrihydrite. Here we describe the state of knowledge on the biotransformation of synthetic 2-line ferrihydrite by laboratory cultures of DMRB using select published data and new experimental results. A facultative DMRB is emphasized ( Shewanella putrefaciens ) upon which most of this work has been performed. Key factors controlling the identity of the secondary mineral suite are evaluated including medium composition, electron donor and acceptor concentrations, ferrihydrite aging/recrystallization status, sorbed ions, and co-associated crystalline Fe(III) oxides. It is shown that crystalline ferric (goethite, hematite, lepidocrocite), ferrous (siderite, vivianite), and mixed valence (magnetite, green rust) iron solids are formed in anoxic, circumneutral DMRB incubations. Some products are well rationalized based on thermodynamic considerations, but others appear to result from kinetic pathways driven by ions that inhibit interfacial electron transfer or the precipitation of select phases. The primary factor controlling the nature of the secondary mineral suite appears to be the Fe(II) supply rate and magnitude, and its surface reaction with the residual oxide and other sorbed ions. The common observation of end-product mineral mixtures that are not at global equilibrium indicates that microenvironments surrounding respiring DMRB cells or the reaction-path trajectory (over Eh-pH space) may influence the identity of the final biomineralization suite.