磁铁矿
地杆菌
无氧光合作用
氧化还原
细菌
紫色细菌
氧化剂
铁细菌
化学
环境化学
光养
材料科学
无机化学
生物膜
电子转移
光化学
冶金
生物
光合反应中心
有机化学
遗传学
作者
James M. Byrne,Nicole Klueglein,Carolyn I. Pearce,Kevin M. Rosso,Erwin Appel,Andreas Kappler
出处
期刊:Science
[American Association for the Advancement of Science (AAAS)]
日期:2015-03-27
卷期号:347 (6229): 1473-1476
被引量:232
标识
DOI:10.1126/science.aaa4834
摘要
Microorganisms are a primary control on the redox-induced cycling of iron in the environment. Despite the ability of bacteria to grow using both Fe(II) and Fe(III) bound in solid-phase iron minerals, it is currently unknown whether changing environmental conditions enable the sharing of electrons in mixed-valent iron oxides between bacteria with different metabolisms. We show through magnetic and spectroscopic measurements that the phototrophic Fe(II)-oxidizing bacterium Rhodopseudomonas palustris TIE-1 oxidizes magnetite (Fe3O4) nanoparticles using light energy. This process is reversible in co-cultures by the anaerobic Fe(III)-reducing bacterium Geobacter sulfurreducens. These results demonstrate that Fe ions bound in the highly crystalline mineral magnetite are bioavailable as electron sinks and electron sources under varying environmental conditions, effectively rendering magnetite a naturally occurring battery.
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