Silicon and Phosphorus Linkage with Iron via Oxygen in the Amorphous Matrix of Gallionella ferruginea Stalks
Silicon and Phosphorus Linkage with Iron via Oxygen in the Amorphous Matrix of Gallionella ferruginea Stalks
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DOI：
10.1128/aem.05913-11
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发表时间：
2011-10
影响因子：
4.4
通讯作者：
Tomoko Suzuki;H. Hashimoto;Atsushi Itadani;Nobuyuki Matsumoto;H. Kunoh;J. Takada
中科院分区：
文献类型：
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作者：
Tomoko Suzuki;H. Hashimoto;Atsushi Itadani;Nobuyuki Matsumoto;H. Kunoh;J. Takada
Gallionella属细菌是一种铁氧化细菌，在水生环境中产生独特的由氧化铁包裹的无机/有机纤维组成的扭曲胞外秸秆。本文介绍了Gallionella茎的结晶度和茎纤维中组成元素的化学联系。透射电镜显示，纤维边缘的基质由直径约3nm的初级颗粒组成。扫描透射电子显微镜显示纤维表面粗糙的颗粒状结构，反映了初级颗粒的无序组合，表明纤维具有高孔隙率和大比表面积。这可能使表面具有更广泛的反应性。x射线衍射、选择区域电子衍射和高分辨率透射电子显微镜共同表明，初级颗粒具有非晶结构。此外，能量色散x射线分析和傅里叶变换红外光谱检测了秸秆中O-H、Fe-O-H、P-O-H、Si-O-H、Si-O-Fe和P-O-Fe键的振动模式特征带。这表明微量组成元素P和Si可能通过o与Fe连接而影响纤维的结晶度。这些元素相互关联的知识为深入了解秸秆独特的无机/有机杂化结构提供了更深入的见解。
ABSTRACT Bacterial species belonging to the genus Gallionella are Fe-oxidizing bacteria that produce uniquely twisted extracellular stalks consisting of iron-oxide-encrusted inorganic/organic fibers in aquatic environments. This paper describes the degree of crystallinity of Gallionella stalks and the chemical linkages of constituent elements in the stalk fibers. Transmission electron microscopy revealed that the matrix of the fiber edge consisted of an assembly of primary particles of approximately 3 nm in diameter. Scanning transmission electron microscopy revealed the rough granular surfaces of the fibers, which reflect the disordered assembly of the primary particles, indicating a high porosity and large specific surface area of the fibers. This may provide the surface with broader reactive properties. X-ray diffractometry, selected-area electron diffraction, and high-resolution transmission electron microscopy together showed that the primary particles had an amorphous structure. Furthermore, energy-dispersive X-ray analysis and Fourier transform infrared spectroscopy detected the bands characteristic of the vibrational modes assigned to O-H, Fe-O-H, P-O-H, Si-O-H, Si-O-Fe, and P-O-Fe bonds in the stalks, suggesting that the minor constituent elements P and Si could affect the degree of crystallinity of the fibers by linking with Fe via O. This knowledge about the mutual associations of these elements provides deeper insights into the unique inorganic/organic hybrid structure of the stalks.