Microbial iron reduction under oxic conditions: implications for subsurface biogeochemistry
arxiv(2024)
摘要
Iron (Fe) reduction is one of Earth's most ancient microbial metabolisms, but
after atmosphere-ocean oxygenation, this anaerobic process was relegated to
niche anoxic environments below the water and soil surface. However, new
technologies to monitor redox processes at the microscale relevant to microbial
cells have recently revealed that the oxygen (O2) concentrations controlling
the distribution of aerobic and anaerobic metabolisms are more heterogeneous
than previously believed. To explore how O2 levels regulate microbial Fe
reduction, we cultivated a facultative Fe-reducing bacterium using a
cutting-edge microfluidic reactor integrated with transparent planar O2
sensors. Contrary to expectations, microbial growth induced Fe(III)-oxide
(ferrihydrite) reduction under fully oxygenated conditions without forming
O2-depleted microsites. Batch incubations highlighted the importance of the
process at a larger scale, fundamentally changing our understanding of Fe
cycling from the conceptualization of metal and nutrient mobility in the
subsurface to our interpretation of Fe mineralogy in the rock record.
更多查看译文
AI 理解论文
溯源树
样例
生成溯源树,研究论文发展脉络
Chat Paper
正在生成论文摘要