铁在海洋表面的光化学循环,由微生物结合铁的连接物介导
K Barbeau1, E L Rue, K W Bruland
1Department of Chemistry and Biochemistry, University of California, Santa Barbara, California 93106, USA.
Nature
|September 28, 2001
概括
海洋中涉及铁(III) - siderophore 复合物的光化学反应释放铁,增加了对浮游生物的可用性. 这一过程由α-基酸介导,影响水生铁循环和初级生产.
科学领域:
- 海洋化学 海洋化学
- 生物地质化学生物地质化学
- 摄影化学的使用.
背景情况:
- 铁是海洋初级生产的关键限制营养素,特别是在广的海洋地区.
- 表面海洋中溶解的铁 (III) 主要与强有机连接物复合,可能是生物来源的.
- 这些有机配体在水生铁循环中的确切作用仍然不完全理解.
研究的目的:
- 为了研究铁的光化学反应 (III) 与 siderophores 结合,这是细菌的铁获取配体.
- 阐明这些光化学反应影响海洋环境中铁的可用性的机制.
- 评估特定的连接物部分,如α-酸,在调解这些反应中的作用.
主要方法:
- 观察涉及铁 (III) - siderophore复合物的光化学反应.
- 对光解产品的分析,包括连接物亲和和铁物种化的变化.
- 确定负责调解观察到的光化学转换的化学部分.
主要成果:
- 铁 (III) - siderophore复合物的光解导致较弱的铁 (III) 结合联体的形成.
- 光化学反应导致铁的降解 (III) 到铁 (II),提高铁的生物可用性.
- 在 siderophores 中的α-酸组被确定为这些光反应的关键调解者.
结论:
- (III) - siderophore光解增加了可供海洋浮游生物吸收的铁的可用性.
- 这些光化学过程有助于铁在海洋的euphotic区域的循环.
- 通过光化学机制,铁结合联体可以显著影响反应性铁物种的产生和水生系统中铁的总体可用性.
更多相关视频
06:52Experimental Column Setup for Studying Anaerobic Biogeochemical Interactions Between Iron OxyHydroxides, Trace Elements, and Bacteria
Published on: December 19, 2017
8.3K
09:45Laboratory Simulation of an IronII-rich Precambrian Marine Upwelling System to Explore the Growth of Photosynthetic Bacteria
Published on: July 24, 2016
12.4K
相关概念视频
01:29Microbes and the Sulfur Cycle
44
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...
44
01:24Microbes and Other Elemental Cycles
61
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...
61
01:30Marine Microbial Ecology
39
Marine microbial ecosystems are shaped by distinct physicochemical limits, including high salinity, low nutrient availability, and fluctuating oxygen levels. These conditions favor smaller microbial cell sizes, which maximize their surface-to-volume ratio for efficient nutrient uptake.Microbial activity and community composition are closely linked to biogeochemical cycles, particularly in dynamic environments like estuaries, where halotolerant microbes thrive in response to variable salinity...
39
01:24Microbial Corrosion
41
Microbiologically Influenced Corrosion (MIC) is a significant form of material degradation caused by the metabolic activities of microorganisms. This phenomenon poses substantial challenges across various industries, including oil and gas, maritime, and water treatment sectors.MIC occurs when microorganisms, such as bacteria, archaea, and fungi, colonize metal surfaces, forming biofilms that alter the local electrochemical environment. These biofilms can lead to the production of corrosive...
41
01:30Anoxygenic Photosynthesis
1.7K
Anoxygenic photosynthesis is a phototrophic process that captures light energy to drive carbon fixation without producing molecular oxygen. Unlike oxygenic photosynthesis, which utilizes water as an electron donor and releases oxygen, anoxygenic phototrophs use alternative electron donors such as hydrogen sulfide (H₂S), elemental sulfur (S⁰), or thiosulfate (S₂O₃²⁻). This process is carried out by diverse groups of bacteria, including purple bacteria, green...
1.7K
01:28Microbial Nutrition
1.9K
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...
1.9K