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関連する概念動画

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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The Supercomplexes in the Crista Membrane01:41

The Supercomplexes in the Crista Membrane

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The mitochondrial cristae membrane is the primary site for the oxidative phosphorylation (OXPHOS) process of energy conversion mediated through respiratory complexes I to V. These complexes have been widely studied for decades, and it has been proven that they form supramolecular structures called respiratory supercomplexes (SC). These higher-order complexes may be crucial in maintaining the biochemical structure and improving the physiological activity of the individual complexes while...
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Thermal and Photochemical Electrocyclic Reactions: Overview01:26

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Electrocyclic reactions are reversible reactions. They involve an intramolecular cyclization or ring-opening of a conjugated polyene. Shown below are two examples of electrocyclic reactions. In the first reaction, the formation of the cyclic product is favored. In contrast, in the second reaction, ring-opening is favored due to the high ring strain associated with cyclobutene formation.
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The Photochemical Reaction Center01:29

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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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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...
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Carbon-dioxide Fixation01:28

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Carbon dioxide fixation in prokaryotes enables the assimilation of inorganic carbon into organic molecules, supporting biosynthetic pathways, sustaining ecosystems, and contributing to the global carbon cycle. It also has industrial applications in carbon capture and bioproduct synthesis. Autotrophic organisms rely on this process to utilize CO₂ as a carbon source in diverse environments.The Calvin CycleThe Calvin cycle is the most widespread carbon fixation mechanism, primarily used by...
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Updated: Aug 4, 2025

Synthesis and Performance Characterizations of Transition Metal Single Atom Catalyst for Electrochemical CO2 Reduction
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可視光駆動CO2削減のための鉄複合体ベースの超分子フレームワーク触媒

Kento Kosugi1, Chiharu Akatsuka1, Hikaru Iwami1

  • 1Division of Applied Chemistry, Graduate School of Engineering, Osaka University, 2-1 Yamadaoka, Suita, Osaka 565-0871, Japan.

Journal of the American Chemical Society
|April 6, 2023
PubMed
まとめ
この要約は機械生成です。

研究者は,可視光を用いた効率的な二酸化炭素 (CO2) 削減のための新しい鉄複合光触媒を開発しました. この金属のない触媒は高い活性と選択性を示し,CO2変換のための持続可能な解決策を提供します.

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Preparation of Polyoxometalate-based Photo-responsive Membranes for the Photo-activation of Manganese Oxide Catalysts
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科学分野:

  • 材料科学
  • 光触媒
  • 緑の化学

背景:

  • 分子ベースの異質光触媒は,可視光によるCO2削減に有望である.
  • 高貴な金属のない触媒は高い需要がありますが,しばしば低活性を示します.
  • CO2削減のための貴金属のない光触媒に関する既存の報告は限られている.

研究 の 目的:

  • 高活性で,選択的で,安定した高貴金属のない異質な光触媒をCO2削減のために開発する.
  • 鉄複合体ベースの超分子フレームワークの光触媒的CO2変換の有効性を調査する.

主な方法:

  • 鉄ポルフィリン複合体とピレン分子を用いた超分子構造体の合成.
  • 可視光照射下でのCO2削減のための光触媒活性試験
  • 製品の選択性,明らかな量産量,そして長期的な安定性の評価.

主要な成果:

  • 鉄複合体ベースの光触媒は99.9%の選択性で高いCO生成活性 (29100μmol g-1 h-1) を達成した.
  • 触媒は優れた安定性を示し,最大96時間有効に機能した.
  • 400 nmでのCO生成の0.298%の明らかな量子収量が記録された.

結論:

  • CO2削減のための新しい,高度に活性的で,選択的で,安定した鉄複合光触媒が開発されました.
  • 超分子フレームワーク戦略は貴金属のない光触媒への簡単な経路を提供します.
  • この進歩はCO2の利用と変換に 持続可能なアプローチを提供する.