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相关概念视频

Photosystems01:32

Photosystems

4.9K
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...
4.9K
The Z-Scheme of Electron Transport in Photosynthesis01:34

The Z-Scheme of Electron Transport in Photosynthesis

10.2K
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...
10.2K
Oxygenic Photosynthesis01:26

Oxygenic Photosynthesis

19
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...
19
Photosystem II01:22

Photosystem II

70.8K
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...
70.8K
Photosystem I01:27

Photosystem I

62.6K
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...
62.6K
Photochemical Electrocyclic Reactions: Stereochemistry01:26

Photochemical Electrocyclic Reactions: Stereochemistry

1.8K
The absorption of UV–visible light by conjugated systems causes the promotion of an electron from the ground state to the excited state. Consequently, photochemical electrocyclic reactions proceed via the excited-state HOMO rather than the ground-state HOMO. Since the ground- and excited-state HOMOs have different symmetries, the stereochemical outcome of electrocyclic reactions depends on the mode of activation; i.e., thermal or photochemical.
Selection Rules: Photochemical Activation
1.8K

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相关实验视频

Updated: Jul 13, 2025

Developing Photosensitizer-Cobaloxime Hybrids for Solar-Driven H2 Production in Aqueous Aerobic Conditions
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Developing Photosensitizer-Cobaloxime Hybrids for Solar-Driven H2 Production in Aqueous Aerobic Conditions

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基于结合分子的多组件人工光合作用系统,用于生产多目标产品.

Chuanwei Zhu1,2, Zhiqiang Gao1,2, Wen Yu1,2

  • 1Beijing National Laboratory for Molecular Sciences, Key Laboratory of Organic Solids, Institute of Chemistry, Chinese Academy of Sciences, Beijing, 100190, P. R. China.

Small (Weinheim an der Bergstrasse, Germany)
|October 16, 2023
PubMed
概括

研究人员开发了基于脂质体的人造光合作用纳米囊 (PSNC) 以有效利用太阳能. 这些纳米囊整合了多个催化系统以产生氧气,尼古丁胺胺氨基二核酸 (NADH) 和腺三酸盐,提供了一个可持续的能量转化平台.

关键词:
人工光合成系统的人工光合成系统生物合成生物合成化学催化剂的化学催化作用.脂质体组是什么? 脂质体组是什么?光催化作用的光催化作用

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Preparation of Polyoxometalate-based Photo-responsive Membranes for the Photo-activation of Manganese Oxide Catalysts
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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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相关实验视频

Last Updated: Jul 13, 2025

Developing Photosensitizer-Cobaloxime Hybrids for Solar-Driven H2 Production in Aqueous Aerobic Conditions
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Developing Photosensitizer-Cobaloxime Hybrids for Solar-Driven H2 Production in Aqueous Aerobic Conditions

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Preparation of Polyoxometalate-based Photo-responsive Membranes for the Photo-activation of Manganese Oxide Catalysts
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Preparation of Polyoxometalate-based Photo-responsive Membranes for the Photo-activation of Manganese Oxide Catalysts

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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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科学领域:

  • 生物技术是生物技术.
  • 纳米技术纳米技术
  • 摄影化学的使用.

背景情况:

  • 人工光合作用系统对于通过模仿自然过程来解决全球能源短缺至关重要.
  • 高效的太阳能利用需要在单一系统中集成多种不同的催化功能.

研究的目的:

  • 开发基于脂质体的人工光合作用纳米囊 (PSNC),集成光催化,化学催化和生物催化系统.
  • 评估PSNC在产生氧气,NADH和ATP等关键分子中的效率.
  • 为了证明PSNC在模拟光独立反应以合成有价值产品方面的能力.

主要方法:

  • 采用单方法合成PSNC,封装了5,10,15,20-tetra(4-pyridyl) -氨酸,三二-酸,--乙烯-复合物和肌酸酶.
  • 在PSNC和简单水性混合物之间对产品生成 (氧,NADH,ATP) 的比较分析.
  • 在PSNC中使用再生的NADH和酒精脱酶用于甲醇合成的光独立反应的演示.

主要成果:

  • 与传统方法相比,PSNC在氧气 (231%),NADH (30%) 和ATP (86%) 生产方面表现出显著的改善.
  • 纳米囊成功模拟了光独立反应,使各种产品的可控合成成为可能.
  • 通过酒精脱酶的甲醇合成因PSNC内再生的NADH而提高了37%.

结论:

  • 基于脂质体的PSNC为可持续的太阳能转换提供了一个有希望和多功能平台.
  • 集成的多催化系统可以有效地同时合成多种有价值的产品.
  • 这种方法为先进的人工光合作用应用提供了一种巧妙而简单的方法.