由减少铁的细菌产生的 siderite 的形态,微观结构和现场化学特征
Xiaohua Han1,2,3,4, Fuxian Wang1,2,3,4, Shiling Zheng5
1Key Laboratory of Earth and Planetary Physics, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China.
Environmental science & technology
|May 14, 2024
概括
分解降铁细菌 (DIRB) 通过多步增长过程产生 siderite 矿物质. 这些生物生成的 siderite 颗粒具有独特的形状,并含有有机分子,为微生物铁循环提供了洞察力.
科学领域:
- 地质化学 地质化学
- 微生物学 微生物学
- 生物矿物化 生物矿物化
背景情况:
- 分解降铁细菌 (DIRB) 产生含Fe (II) 的矿物质,如磁铁和 siderite.
- 与磁石相比,DIRB的矿化过程和 siderite 形成机制尚不清楚.
研究的目的:
- 为了研究生物性 siderite 的形态,结构和化学特征.
- 为了阐明由*Shewanella oneidensis* MR-4产生的 siderite 的矿化过程和组装机制.
主要方法:
- 使用 *Shewanella oneidensis* MR-4 的生长实验.
- 先进的电子显微镜.
- 基于同步的扫描传输X射线显微镜 (STXM).
主要成果:
- 铁 (Fe) 离子与CO3^2反应,形成微米大小的 siderite,形状各异 (螺旋,棒,花生,子,球).
- 生物性 siderite 颗粒由来自中心核心的单晶板组成.
- STXM揭示了铁化物 (Fh) 和有机分子在 siderite 结构中的存在.
结论:
- DIRB通过连续的多步增长过程诱导 siderite 生物矿物化和组装.
- 独特的粒子形状和内部有机分子是生物性 siderite 的特征特征.
- 这些发现提供了证据,证明 siderite 晶体组装围绕一个 ferrihydrite 有机分子核心.
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