Microbial polysaccharides template assembly of nanocrystal fibers

被引：327
作者：
Chan, CS
De Stasio, G [1 ]
Welch, SA
Girasole, M
Frazer, BH
Nesterova, MV
Fakra, S
Banfield, JF
机构：
[1] Univ Calif Berkeley, Dept Earth & Planetary Sci, Berkeley, CA 94720 USA
[2] Univ Wisconsin, Dept Phys, Madison, WI 53706 USA
[3] Univ Wisconsin, Dept Geol & Geophys, Madison, WI 53706 USA
[4] Univ Wisconsin, Ctr Synchrotron Radiat, Stoughton, WI 53589 USA
[5] CNR, Ist Struttura Mat, I-00044 Frascati, Italy
[6] Univ Calif Berkeley, Lawrence Berkeley Lab, Adv Light Source, Berkeley, CA 94720 USA
来源：
SCIENCE | 2004年 / 303卷 / 5664期
关键词：
D O I：
10.1126/science.1092098
中图分类号：
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号：
07 ; 0710 ; 09 ;
摘要：
Biological systems can produce extraordinary inorganic structures and morphologies. The mechanisms of synthesis are poorly understood but are of great interest for engineering novel materials. We use spectromicroscopy to show that microbially generated submicrometer-diameter iron oxyhydroxide (FeOOH). laments contain polysaccharides, providing an explanation for the formation of akaganeite pseudo-single crystals with aspect ratios of similar to1000:1. We infer that the cells extrude the polysaccharide strands to localize FeOOH precipitation in proximity to the cell membrane to harness the proton gradient for energy generation. Characterization of organic compounds with high spatial resolution, correlated with mineralogical information, should improve our understanding of biomineralization mechanisms.
引用
收藏
页码：1656 / 1658
页数：3
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