中文摘要：

本文通过观察在尿素和Stoke培养基中生长的球衣菌细胞壁内及其周围氢氧化铁凝胶的矿化过程，研究球衣菌分泌的多糖和蛋白质对氢氧化铁凝胶矿化结晶行为的调控作用。采用TEM、UV和FTIR对两种矿化体系微生物矿化产物进行了观察和分析，同时对比以纯葡聚糖为有机基质作用下氢氧化铁凝胶的矿化过程，结果表明微生物多糖和葡聚糖均能控制水溶液中铁离子及氢氧化铁凝胶的成核机制、结晶相和晶体的生长速度，主要矿化产物为纳米级四方纤铁矿（βFaOOH）。

英文摘要：

To study the modulating effect of polysaccharide and protein secreted by Sphaerotilus upon the mineralization behaviors of Fe（OH）3 gel, the authors investigated the nucleation and crystallization processes of Fe（OH）3 gel inside and around the Sphaerotilus cells which were growing in the mineralization systems with urea and Stoke＇substrate. The minerals were characterized by TEM, UV and FTIR spectrometry. A comparison of the mineralization processes of Fe（OH）3 gel functioned by pure dextran shows that both microbial polysaccharide and dextran could control the nucleation mechanisms, nuclei phases and the growth rate of ferric ions and Fe（OH）3 gel in the solution. The major mineral seems to be nanometric size akaganeite （β-FeOOH） .