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相关概念视频

Oxygenic Photosynthesis01:26

Oxygenic Photosynthesis

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Oxygenic photosynthesis is a fundamental process in which light energy is harnessed to drive the oxidation of water, leading to the production of molecular oxygen (O₂), adenosine triphosphate (ATP), and nicotinamide adenine dinucleotide phosphate (NADPH). This process is essential for sustaining aerobic life on Earth and is primarily carried out by cyanobacteria, algae, and plants. The core of oxygenic photosynthesis lies in the thylakoid membranes, where chlorophyll pigments facilitate...
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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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Balancing Redox Equations02:58

Balancing Redox Equations

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Electrochemistry is the science involved in the interconversion of electrical and chemical reactions. Such reactions are called reduction-oxidation, or redox reactions. These important reactions are defined by changes in oxidation states for one or more reactant elements and include a subset of reactions involving the transfer of electrons between reactant species. Electrochemistry as a field has evolved to yield sufficient insights on the fundamental principles of redox chemistry and multiple...
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Redox Equilibria: Overview01:23

Redox Equilibria: Overview

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A reduction-oxidation reaction is commonly called a redox reaction. In a redox reaction, electrons are transferred from one species to another rather than being shared between or among atoms. The reducing agent or reductant is the species that loses electrons and gets oxidized in the process. The species that gains electrons and gets reduced in the process is the oxidizing agent or oxidant. Redox reactions are represented as two separate equations called half-reactions, where one equation...
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Electrolysis03:00

Electrolysis

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In a galvanic cell, the electrical work is done by a redox system on its surroundings as electrons produced by the spontaneous redox reactions are transferred through an external circuit. Alternatively, an external circuit does work on a redox system by imposing a voltage sufficient to drive an otherwise nonspontaneous reaction in a process known as electrolysis. For instance, recharging a battery involves the use of an external power source to drive the spontaneous (discharge) cell reaction in...
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Electron Transport Chain: Complex III and IV01:43

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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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相关实验视频

Updated: Jul 24, 2025

Exploring the Radical Nature of a Carbon Surface by Electron Paramagnetic Resonance and a Calibrated Gas Flow
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通过跟踪原子层次的电荷流,了解氧气进化机制.

Changming Zhao1,2, Hao Tian1,3, Zhigang Zou1

  • 1School of Science and Engineering, The Chinese University of Hong Kong, Shenzhen 518172, China.

iScience
|July 10, 2023
PubMed
概括

这项研究揭示了水轨道位置决定了氧气演变反应路径,允许混合金属和晶格氧气主导的氧化步骤. 这有助于对水分裂催化剂的理解.

关键词:
分子力学计算分子力学计算物理化学 物理化学理论化学是一种理论化学.

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Anaerobic Protein Purification and Kinetic Analysis via Oxygen Electrode for Studying DesB Dioxygenase Activity and Inhibition

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相关实验视频

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科学领域:

  • 催化剂是一种催化剂.
  • 表面化学 表面化学
  • 计算材料科学科学 计算材料科学

背景情况:

  • 目前的氧化演化催化剂分类依赖于清洁的催化剂能量水平.
  • 一般认为催化剂只遵循特定的反应化学 (例如,晶格氧介导或吸附金属介导) 没有外部触发.

研究的目的:

  • 用*ab initio*理论研究水对催化剂系统中的电荷流.
  • 确定控制氧演化反应 (OER) 中电子转移步骤的因素.
  • 为了阐明光催化水在TiO2上分裂的微观路径110).

主要方法:

  • 利用 *ab initio* 理论来追踪水在催化剂系统中的电荷流.
  • 分析了水轨道位置对氧化途径的影响.
  • 检查了TiO2的光催化途径 () 对于氧的演变.

主要成果:

  • 水轨道的位置对于确定电子转移阶段是以水为主导的氧化 (WDO),网格氧气主导的氧化 (LoDO) 或金属主导的氧化 (MDO) 是至关重要的.
  • 对于TiO2 ((110),可行的OER途径可以涉及纯吸附金属交换 (AEM) 步骤或混合AEM-LOM步骤.
  • 证明了在没有外部触发器的情况下,可以在AEM和LOM步骤之间进行混合.

结论:

  • 提供了精确的原子层次描述在水分裂中的氧化还原化学.
  • 提升了对水分裂催化剂如何产生脱氧的基本理解.
  • 通过在OER路径机制中展示灵活性来挑战现有的分类.