Geobacter metallireducens异化还原铁氧化物三种方式  

Three paths to reduce ferric oxides taken by Geobacter metallireducens

作　　者：冯雅丽[1] 周良[2] 祝学远[1] 连静[1] 李少华[2] 

机构地区：[1]北京科技大学土木与环境工程学院,北京100083 [2]中国科学院研究生院,中国科学院过程工程研究所生化工程国家重点实验室,北京100080

出　　处：《北京科技大学学报》2006年第6期524-529,共6页Journal of University of Science and Technology Beijing

基　　金：国家自然科学基金资助项目(No.20476009;No.20576137);国家"973"资助项目(No.2003CB716001)

摘　　要：异化金属还原菌通过络和剂、电子传递中间体、直接接触三种方式异化还原金属氧化矿.以Geobactermetallireducens还原铁氧化物为实验体系,利用微生物燃料电池考察了以上三种方式对异化还原铁氧化物的影响.结果表明,微生物异化还原铁氧化矿时,NTA,AQDS在初始阶段显著加速铁氧化物的还原,但也加速磁铁矿的生成,阻碍反应继续进行;直接接触方式起着重要作用,吸附形成的生物膜是一个关键因素,其形成是一个相对较长的过程.生物膜的形成阻碍电子传递中间体发挥作用.There were three ways to reduce metal oxides by metal reducing microorganisms： direct contact, electron shuttling and chelation of insoluble metal oxides. A microbial fuel cell by Geobacter metallireducens was used to investigate the influence of the three paths on the rate of dissimilatory iron reduction. The results indicate that in the process of dissimilatory metal reduction, NTA and AQDS can accelerate the speed of ferric oxides reduction and magnetite generation in the initial stage, but magnetite production prevents further iron reduction. Direct contact is a very important way, and the biomembrane formed by adsorption for long time is a critical factor for reduction. Electron shuttling plays a less important role after most of mineral oxides surfaces have been enclosed by microorganisms.

关 键 词：铁氧化物 铁还原 异化金属还原菌 微生物燃料电池 

分 类 号：Q93[生物学—微生物学]