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相关概念视频

What are Biogeochemical Cycles?00:54

What are Biogeochemical Cycles?

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The most common elements in organic molecules, carbon, hydrogen, oxygen, nitrogen, sulfur, and phosphorus, are only available in the ecosystem in limited amounts. Therefore, these nutrients must be recycled through both biotic and abiotic components of the ecosystem, in processes generally called biogeochemical cycles.
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Bioremediation00:46

Bioremediation

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Bioremediation is the use of prokaryotes, fungi, or plants to remove pollutants from the environment. This process has been used to remove harmful toxins in groundwater as a byproduct of agricultural run-off and also to clean up oil spills.
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Oxidation and Reduction of Organic Molecules01:19

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Energy production within a cell involves many coordinated chemical pathways. Most of these pathways are combinations of oxidation and reduction reactions, which occur at the same time. An oxidation reaction strips an electron from an atom in a compound, and the addition of this electron to another compound is a reduction reaction. Because oxidation and reduction usually occur together, these pairs of reactions are called redox reactions.
The removal of an electron from a molecule, results in a...
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The Z-Scheme of Electron Transport in Photosynthesis01:34

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The light reactions of photosynthesis assume a linear flow of electrons from water to NADP+. During this process, light energy drives the splitting of water molecules to produce oxygen. However, oxidation of water molecules is a thermodynamically unfavorable reaction and requires a strong oxidizing agent. This is accomplished by the first product of light reactions: oxidized P680 (or P680+), the most powerful oxidizing agent known in biology. The oxidized P680 that acquires an electron from the...
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The oxidation of an organic compound in the presence of air or oxygen is called autoxidation. For example, cumene reacts with oxygen to form hydroperoxide. Autoxidation involves initiation, propagation, and termination steps. Many organic compounds are susceptible to autoxidation—especially ethers in the presence of oxygen, which form hydroperoxides. Even though this reaction is slow, old ether bottles contain small amounts of peroxide, which leads to laboratory explosions during ether...
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Overview
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相关实验视频

Updated: Jul 1, 2025

Understanding Dissolved Organic Matter Biogeochemistry Through In Situ Nutrient Manipulations in Stream Ecosystems
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Understanding Dissolved Organic Matter Biogeochemistry Through In Situ Nutrient Manipulations in Stream Ecosystems

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光化学过程根据其初始成分不同地转化溶解的有机物质.

Sheng-Ao Li1, Qianru Wang1, Hua Ma1

  • 1College of Environment and Ecology, Key Laboratory of the Three Gorges Reservoir Region's Eco-Environment, Ministry of Education, Chongqing University, Chongqing 400045, China.

The Science of the total environment
|March 7, 2024
PubMed
概括

溶解有机物 (DOM) 暴露于光线的影响取决于其初始成分. 发生光漂白和化,改变DOM.

关键词:
溶解的有机物质是有机物质.通过光化进行化.照片转换的过程中.摄影漂白是一种照片漂白.反应性中间体反应性中间体

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Single-throughput Complementary High-resolution Analytical Techniques for Characterizing Complex Natural Organic Matter Mixtures
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Unraveling the Unseen Players in the Ocean - A Field Guide to Water Chemistry and Marine Microbiology
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科学领域:

  • 环境化学环境化学
  • 生物地质化学生物地质化学
  • 摄影化学的使用.

背景情况:

  • 溶解有机物 (DOM) 对全球碳循环至关重要.
  • 对于DOM对光的分子级反应还不太清楚.
  • 关于光漂白,光化和氧化性质的关键问题仍然存在.

研究的目的:

  • 为了研究水生DOM对光的分子级化学反应.
  • 为了确定DOM组合如何影响其在光下的转换.
  • 阐明反应性中间体在DOM光转化中的作用.

主要方法:

  • 来自各种淡水源的水生DOM暴露在现实的光线条件下.
  • 对DOM分子组成和转化途径的分析.
  • 评估反应性氧物种 (ROS) 和激发状态DOM自氧化的影响.

主要成果:

  • 光漂白发生在高性DOM中,产生低H/C分子.
  • 低和藻类DOM经历了化,形成了更多的不和,高H/C分子.
  • DOM转换受反应性中间体的影响,在高土条件下ROS占主导地位.
  • 藻类DOM转化主要是由兴奋状态DOM自氧化驱动的.

结论:

  • DOM光转化模式强烈依赖于初始分子组成.
  • 光化学过程显著影响DOM生物可用性和生物地化学循环.
  • 了解这些光驱动的转变是预测碳循环动态的关键.