在磁铁中Fe (II) 和Fe (III) 的氧化还原循环由Fe-代谢细菌进行
James M Byrne1, Nicole Klueglein2, Carolyn Pearce3
1Geomicrobiology, Center for Applied Geosciences, University of Tuebingen, Sigwartstrasse 10, 72076 Tuebingen, Germany. James.Byrne@uni-tuebingen.de.
Science (New York, N.Y.)
|March 28, 2015
概括
微生物可以使用磁石纳米颗粒作为天然电池. 一种细菌利用光氧化磁铁,另一种细菌减少磁铁,显示在不断变化的环境中共享电子.
科学领域:
- 环境微生物学环境微生物学
- 地质化学 地质化学
- 生物地质化学循环 生物地质化学循环
背景情况:
- 微生物驱动环境中的铁氧化还原循环.
- 细菌利用铁矿物质中的Fe (II) 和Fe (III) 来进行生长.
- 不同微生物新陈代谢之间的混合价值氧化铁中电子共享尚未得到充分理解.
研究的目的:
- 研究不同代谢的细菌之间混合价值氧化铁中的电子转移.
- 为了确定磁石纳米颗粒是否可以作为微生物过程的电子源和沉降器.
主要方法:
- 使用磁性和光谱测量来分析磁纳米颗粒.
- 共同培养实验是用Rhodopseudomonas palustris TIE-1和Geobacter sulfurreducens进行的.
主要成果:
- 摄影性细菌Rhodopseudomonas palustris TIE-1使用光能氧化磁铁纳米颗粒.
- 这种氧化过程是可逆的无氧Fe (III) 减少细菌Geobacter sulfurreducens在共同培养中.
- 晶体磁铁中的铁离子作为电子捐赠者和接受者具有生物可用性.
结论:
- 磁石纳米颗粒作为一种自然存在的电池,促进微生物电子转移.
- 这证明了在不断变化的环境条件下,混合价值氧化铁中电子共享的机制.
- 微生物对磁铁的利用强调了它在环境氧化还原过程中的作用.
相关概念视频
01:24Microbes and Other Elemental Cycles
71
Microbial activity plays a pivotal role in the biogeochemical cycling of iron and manganese, especially at the redox gradients characteristic of stratified aquatic environments. These cycles are driven by microbial transformations between oxidized and reduced forms of the metals, allowing organisms to exploit them for metabolic energy and structural purposes.Iron Cycling Across Redox GradientsIn neutral, oxygen-rich surface waters, iron is predominantly found in its oxidized, insoluble ferric...
71
01:28Microbial Nutrition
2.1K
Organisms exhibit remarkable metabolic diversity, categorized based on how they acquire energy and carbon. These strategies enable survival in various ecological niches and are essential for maintaining energy flow and nutrient cycling within ecosystems.Energy and Carbon SourcesOrganisms are classified as phototrophs or chemotrophs based on energy acquisition. Phototrophs use light as their energy source, while chemotrophs rely on oxidizing chemical compounds. Further differentiation arises...
2.1K
01:15Metabolism of Chemolithotrophs
1.3K
Chemolithotrophs are microorganisms that obtain energy by oxidizing inorganic molecules such as hydrogen gas (H₂), ammonia (NH₃), reduced sulfur compounds (H₂S, S²⁻), and ferrous iron (Fe²⁺). Unlike heterotrophic organisms that rely on organic carbon, chemolithotrophs transfer electrons from these inorganic donors to the electron transport chain (ETC), generating a proton motive force (PMF) that drives ATP synthesis through oxidative phosphorylation.
1.3K
01:18Other Unique Bacteria
559
Magnetic bacteria exhibit a directed movement called magnetotaxis, driven by structures called magnetosomes. These magnetosomes consist of chains of magnetic particles made of either magnetite (Fe₃O₄) or greigite (Fe₃S₄) and are organized in a linear conformation by a protein scaffold within invaginations of the cell membrane. The bacteria align along the north–south magnetic field lines, much like a compass needle. They are typically microaerophilic or anaerobic...
559
01:27Microbial Leaching
135
Microbial leaching, also known as bioleaching, is an environmentally favorable method for extracting metals from low-grade ores using specific microorganisms. This biotechnological approach is particularly valuable for mining operations targeting copper, gold, and uranium, where traditional extraction methods may be economically or environmentally impractical.Copper Leaching and Microbial CatalysisIn copper bioleaching, crushed ore is arranged into heaps and irrigated with a dilute sulfuric...
135
01:29Microbes and the Sulfur Cycle
72
Sulfur is a vital element in Earth's biogeochemical systems. It transitions through various inorganic states, including sulfate (SO₄²⁻), elemental sulfur (S⁰), and sulfide (S²⁻). Abiotic and biological mechanisms across oxic and anoxic environments intricately mediate these transformations. Sulfate, the most oxidized form of sulfur, is predominantly stored in rocks, marine sediments, and oceanic waters, acting as a long-term reservoir in the global sulfur...
72