利用微生物燃料电池研究Geobacter metallireducens异化还原铁氧化物

微生物异化还原金属氧化物的过程中， 关键问题是微生物如何把电子传递给最终的固态电子受体.利用新颖的微生物燃料电池体系，可以更细致、准确地研究这一胞外电子传递过程.实验结果表明在Geobacter metallireducens还原铁氧化物过程中， 直接接触是一种重要的电子传递方式; 而电子传递中间体，在金属氧化物表面完全被微生物细胞覆盖后, 也即在金属氧化物表面形成成熟的生物膜后， 其加速电子传递速率的作用减弱.

Microbial fuel cell used in study on dissimilatory ferric oxides reduction by Geobacter metallireducens

To study the extra-cellular electron transfer process by which electrons can be transferred from microbial cells to Fe(Ⅲ) oxides, two experiment systems were established: traditional anaerobic cultivation system and novel microbial fuel cell system. Comparing the data gathered from these two systems,it was proposed that direct contact was a very important way for ferric oxides reduction by Geobacter metallireducens.Electron shuttles played a less important role after most of the surface of mineral oxides were covered by microorganisms,and the reduction rate was to some extent related to the surface area of solid electron acceptors.