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相关概念视频

The Photochemical Reaction Center01:29

The Photochemical Reaction Center

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Reaction centers are pigment-protein complexes that initiate energy conversion from photons to chemical entities. Therefore, photochemical reaction center is a more appropriate term that describes these complexes. The Nobel laureates Robert Emerson and William Arnold provided the first experimental evidence of photochemical reaction centers by demonstrating the participation of nearly 2,500 chlorophyll molecules for the release of just one molecule of oxygen. Despite thousands of photosynthetic...
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Photosystem I01:27

Photosystem I

69.4K
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...
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Photosystem II01:22

Photosystem II

78.3K
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...
78.3K
Photochemical Electrocyclic Reactions: Stereochemistry01:26

Photochemical Electrocyclic Reactions: Stereochemistry

2.2K
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
2.2K
Photoreceptors and Visual Pathways01:22

Photoreceptors and Visual Pathways

8.7K
At the molecular level, visual signals trigger transformations in photopigment molecules, resulting in changes in the photoreceptor cell's membrane potential. The photon's energy level is denoted by its wavelength, with each specific wavelength of visible light associated with a distinct color. The spectral range of visible light, classified as electromagnetic radiation, spans from 380 to 720 nm. Electromagnetic radiation wavelengths exceeding 720 nm fall under the infrared category,...
8.7K
Anoxygenic Photosynthesis01:30

Anoxygenic Photosynthesis

1.1K
Anoxygenic photosynthesis is a phototrophic process that captures light energy to drive carbon fixation without producing molecular oxygen. Unlike oxygenic photosynthesis, which utilizes water as an electron donor and releases oxygen, anoxygenic phototrophs use alternative electron donors such as hydrogen sulfide (H₂S), elemental sulfur (S⁰), or thiosulfate (S₂O₃²⁻). This process is carried out by diverse groups of bacteria, including purple bacteria, green...
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Updated: Jan 13, 2026

Atomic Force Microscopy of Red-Light Photoreceptors Using PeakForce Quantitative Nanomechanical Property Mapping
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Atomic Force Microscopy of Red-Light Photoreceptors Using PeakForce Quantitative Nanomechanical Property Mapping

Published on: October 24, 2014

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逆光转换的机制 在佳能细菌菌中.

Pradipta Dey1, Samidh Ghosh1, Debashree Ghosh1

  • 1School of Chemical Sciences, Indian Association for the Cultivation of Sciences, Jadavpur, Kolkata 700032, India.

The journal of physical chemistry. B
|January 12, 2026
PubMed
概括

这项研究揭示了植物染色体光异构化的两个途径,根据能量确定了首选途径. 蛋白质环境的静电学显著影响了这种光驱动的过程.

科学领域:

  • 生物化学 生物化学
  • 摄影化学的使用.
  • 结构生物学 结构生物学

背景情况:

  • 细菌菌体是利用染色体异构化进行功能的蛋白质.
  • 这种光异构化过程是由蛋白质环境调节的,决定了蛋白质的活性.

研究的目的:

  • 研究植物染色体的反光异构化 (远红色到红色的光吸收).
  • 阐明这个光转换过程中所涉及的不同途径.

主要方法:

  • 对光异构化途径的计算分析.
  • 能源标准评估以确定路径偏好.
  • 前向和反向光异构化机制的比较.

主要成果:

  • 确定了两种潜在的植物染色体逆光异构化途径.
  • 根据计算的能源标准,确定了首选的路径.
  • 证明了蛋白质静电相互作用在路径选择中的关键作用.

结论:

  • 植物染色体逆光异构化至少涉及两个不同的途径.
  • 能源考虑和蛋白质环境静电学决定了占主导地位的光转换路线.

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