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相关概念视频

Electron Transport Chain: Complex III and IV01:43

Electron Transport Chain: Complex III and IV

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During the electron transport chain, electrons from NADH and FADH2 are first transferred to complexes I and II, respectively. These two complexes then transfer the electrons to ubiquinol, which carries them further to complex III. Complex III passes the electrons across the intermembrane space to Cyt c, which carries them further to complex IV. Complex IV donates electrons to oxygen and reduces it to water. As electrons pass through complexes I, III, and IV, the energy released aids the pumping...
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Peroxisomes01:24

Peroxisomes

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Peroxisomes are specialized organelles present in fungi, plant, and animal cells. It can vary in number, size, morphology, and activity depending on the type of tissue and the nutritional state of the cell. For example, cells with active lipid metabolism, such as adipocytes, neurons, and hepatocytes, have more peroxisomes than other cells in the body. Besides their primary role in breaking down complex organic molecules, peroxisomes can also synthesize specific macromolecules and participate in...
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Peroxisomes and Mitochondria01:30

Peroxisomes and Mitochondria

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Peroxisomes and mitochondria are two important oxygen-utilizing organelles in eukaryotic cells. Mitochondria carry out cellular respiration—the process that converts energy from food into ATP. Peroxisomes carry out a variety of functions, primarily breaking down different substances, such as fatty acids.
The peroxisome is a single membrane-bound cellular organelle that can perform several different functions, including lipid metabolism and chemical detoxification. The enzymes within...
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The Electron Transport Chain01:30

The Electron Transport Chain

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The electron transport chain or oxidative phosphorylation is an exothermic process in which free energy released during electron transfer reactions is coupled to ATP synthesis. This process is a significant source of energy in aerobic cells, and therefore inhibitors of the electron transport chain can be detrimental to the cell's metabolic processes.
Inhibitors of the electron transport chain
Rotenone, a widely used pesticide, prevents electron transfer from Fe-S cluster to ubiquinone or Q...
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Electron Transport Chains01:28

Electron Transport Chains

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The final stage of cellular respiration is oxidative phosphorylation that consists of two steps: the electron transport chain and chemiosmosis. The electron transport chain is a set of proteins found in the inner mitochondrial membrane in eukaryotic cells. Its primary function is to establish a proton gradient that can be used during chemiosmosis to produce ATP and generate electron carriers, such as NAD+ and FAD, that are used in glycolysis and the citric acid cycle.
The ETC is comprised of...
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Pyruvate Oxidation01:15

Pyruvate Oxidation

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After glycolysis, the charged pyruvate molecules enter the mitochondria via active transport and undergo three enzymatic reactions. These reactions ensure that pyruvate can enter the next metabolic pathway so that energy stored in the pyruvate molecules can be harnessed by the cells.
First, the enzyme pyruvate dehydrogenase removes the carboxyl group from pyruvate and releases it as carbon dioxide. The stripped molecule is then oxidized and releases electrons, which are then picked up by NAD+...
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相关实验视频

Updated: May 28, 2025

Electrochemical Detection of Deuterium Kinetic Isotope Effect on Extracellular Electron Transport in Shewanella oneidensis MR-1
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细胞外电子吸收通过H2O2进行介导.

Yilian Han1, Chengmei Liao1,2, Xinlei Jiang3

  • 1MOE Key Laboratory of Pollution Processes and Environmental Criteria, Tianjin Key Laboratory of Environmental Remediation and Pollution Control, College of Environmental Science and Engineering, Nankai University, No. 38 Tongyan Road, Jinnan District, Tianjin 300350, China.

Environmental science & technology
|February 13, 2025
PubMed
概括

微生物电子转移产生可再生能源. 使用过氧化 (H2O2) 和催化酶 (katG) 的新途径占生物电流的45%,增强了生物电力生产.

关键词:
自营型细菌是一种自营型细菌.催化酶是一种催化剂.电类动物 电类动物细胞外的电子吸收.有反应性氧物种的反应性氧物种.

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科学领域:

  • 微生物学 微生物学
  • 电化学 电化学 电化学
  • 可再生能源可再生能源是可再生能源.

背景情况:

  • 微生物电子转移是一种有前途的可再生能源.
  • 了解细胞外电子转移机制,特别是氧气减少,至关重要.
  • 目前关于微生物从阴极吸收电子的知识还不完全.

研究的目的:

  • 阐明微生物从氧降解的阴极吸收电子的机制.
  • 确定有助于生物电化学电流生成的新途径.
  • 为了研究过氧化 (H2O2) 在微生物呼吸中的作用.

主要方法:

  • 使用电化学技术研究微生物细胞外电子转移.
  • 量化了一种新的H2O2介导途径对生物流的贡献.
  • 分析了catalase (katG) 在观察到的生物电化学过程中的作用.
  • 操纵了阴极氧气减少的选择性,以评估其对生物流的影响.

主要成果:

  • 发现了显著的H2O2介导的细胞外电子吸收途径.
  • 这种途径在总生物流中贡献了高达45%.
  • 基于H2O2的呼吸需要电子供应和催化酶katG.
  • 增强双电子氧降解,使生物电流增加了2.4倍.
  • 自营生物合成和能量生产途径得到了上调.

结论:

  • 在微生物生物电化学呼吸和电子吸收中,H2O2起着至关重要的作用.
  • 催化酶katG对于这种依赖H2O2的过程至关重要.
  • 优化二电子氧化减排是改善生物电力发电的关键.
  • 这项研究为设计高效的生物电力生产系统提供了见解.