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相关概念视频

Photosystem II01:22

Photosystem II

78.2K
The multi-protein complex photosystem II (PS II) harvests photons and transfers their energy through its bound pigments to its reaction center, and ultimately to photosystem I (PSI) through the electron transport chain. The pigments responsible for caputirng the light energy in photosystems include chlorophyll a, chlorophyll b, and carotenoids.
The pigment molecules are arranged across  two photosystem domains — the antenna complex and the reaction center. The main aim of the pigment...
78.2K
Photosystem I01:27

Photosystem I

69.3K
Although structurally similar to photosystem II (PSII), photosystem I (PSI) is has a different electron supplier and electron acceptor.
Both these photosystems work in concert. An excited electron from PSII is relayed to PSI via an electron transport chain in the thylakoid membrane of the chloroplast, which is comprised of the carrier molecule plastoquinone, the dual-protein cytochrome complex, and plastocyanin. As electrons move between PSII and PSI, they lose energy and must be re-energized...
69.3K
Photosystems01:32

Photosystems

6.8K
Photosystems are multiprotein complexes that form the functional units of photosynthesis in plants, algae, and cyanobacteria. They are found embedded in the membrane of tiny sac-like structures called thylakoids placed inside the chloroplast.
Functioning of Photosystems
Photosystems contain many pigment molecules, such as chlorophylls and carotenoids, arranged in a particular organization across two domains — the antenna complex and the reaction center. The main aim of the pigment...
6.8K
The Antenna Complex01:15

The Antenna Complex

7.5K
Plants and other photosynthetic organisms comprise pigments capable of absorption of direct sunlight. These pigments are present in the reaction center - the main site of photochemical reactions as well as in the antenna complex. Under average light conditions, the rate at which reaction center pigments absorb light is far below the electron transport chain's capacity. As a result, the reaction center alone cannot provide enough energy to drive photosynthesis. The photosynthetic efficiency can...
7.5K
The Z-Scheme of Electron Transport in Photosynthesis01:34

The Z-Scheme of Electron Transport in Photosynthesis

12.9K
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...
12.9K
Oxygenic Photosynthesis01:26

Oxygenic Photosynthesis

680
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...
680

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Updated: Jan 8, 2026

Purification of Active Photosystem I-Light Harvesting Complex I from Plant Tissues
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Purification of Active Photosystem I-Light Harvesting Complex I from Plant Tissues

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在光合作用复合体中的消散途径.

Ignacio Gustin1, Chang Woo Kim2,3, Ignacio Franco1,4,5

  • 1Department of Chemistry, University of Rochester, Rochester, New York 14627, United States.

The journal of physical chemistry letters
|December 12, 2025
PubMed
概括
此摘要是机器生成的。

光合作用过程中的能量消散是由Fenna-Matthews-Olson (FMO) 综合体内的低频振动模式指导的. 这些模式与色素能量差距接近共振,促进了高效的能量传输,甚至可能涉及从环境中借用能量.

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A New Approach for the Comparative Analysis of Multiprotein Complexes Based on 15N Metabolic Labeling and Quantitative Mass Spectrometry
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Separation of Spinach Thylakoid Protein Complexes by Native Green Gel Electrophoresis and Band Characterization using Time-Correlated Single Photon Counting
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A New Approach for the Comparative Analysis of Multiprotein Complexes Based on 15N Metabolic Labeling and Quantitative Mass Spectrometry
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科学领域:

  • * 分子生物物理学和量子动力学.
  • * 光合作用和采光复合体.
  • * 计算化学和凝聚物质物理学.

背景情况:

  • * 了解分子能量流是化学反应,材料特性和光合作用的关键.
  • *在复杂的系统中阐明特定的分子途径来进行能量转移是具有挑战性的.
  • * 费纳-马修斯-奥尔森 (FMO) 复合体调解了从采光色体到绿色硫细菌中的光合作用反应中心的能量传输.

研究的目的:

  • * 调查光子激发能量如何在FMO复合体内消散.
  • * 为了分离蛋白质和色素振动模式对能量动态的贡献.
  • * 识别特定的振动模式,负责能量消耗路径.

主要方法:

  • * 开发了开放量子系统中散射路径理论的高效计算实现.
  • * 在电子合中利用了二次扰动理论.
  • *采用了最先进的FMO模型,具有结构化,染色体特定的光谱密度.

主要成果:

  • *能量消散主要由低频振动模式 (<800 cm-1) 与颜料电子状态能量差距接近共振.
  • * 细菌叶绿素的平面呼吸模式 (∼200 cm-1) 被确定为消散的关键.
  • *高频率的分子内振动 (>800 cm-1) 不会导致散射.
  • *FMO复合体暂时从环境中借取能量,以消散多余的光子能量.

结论:

  • *低频振动模式在指导FMO复合体中的能量消耗方面发挥着至关重要的作用.
  • * 能量转移动态涉及与热环境进行复杂的交换,而不是严格单向的.
  • * 发现可以为人工光采集设备和化学/量子控制系统的设计提供信息.