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関連する概念動画

Ligand Binding Sites02:40

Ligand Binding Sites

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Proteins are dynamic macromolecules that carry out a wide variety of essential processes; however, the activities of most proteins depend on their interactions with other molecules or ions, known as ligands.
Protein-ligand interactions are quite specific; even though numerous potential ligands surround a cellular protein at any given time, only a particular ligand can bind to that protein. Moreover, a ligand binds only to a dedicated area on the surface of the protein, known as the...
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Ligand Binding Sites02:40

Ligand Binding Sites

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Hydrogen Bonds00:26

Hydrogen Bonds

133.3K
Hydrogen bonds are weak attractions between atoms that have formed other chemical bonds. One of these atoms is electronegative, like oxygen, and has a partial negative charge. The other is a hydrogen atom that has bonded with another electronegative atom and has a partial positive charge.
Hydrogen Bonds Control the World!
Because hydrogen has very weak electronegativity when it binds with a strongly electronegative atom, such as oxygen or nitrogen, electrons in the bond are unequally shared....
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Hydrogen Bonds01:04

Hydrogen Bonds

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A hydrogen bond is formed when a weakly positive hydrogen atom already bonded to one electronegative atom (for example, the oxygen in the water molecule) is attracted to another electronegative atom from another polar molecule, such as water (H2O), hydrogen fluoride (HF), or ammonia (NH3). The huge electronegativity difference between the H atom (2.1) and the atom to which it is bonded (4.0 for an F atom, 3.5 for an O atom, or 3.0 for an N atom), combined with the very small size of an H atom...
14.4K
Energy Basics02:27

Energy Basics

47.6K
Chemical reactions, such as those that occur when you light a match, involve changes in energy as well as matter.
47.6K
Conserved Binding Sites01:49

Conserved Binding Sites

5.2K
Many proteins’ biological role depends on their interactions with their ligands, small molecules that bind to specific locations on the protein known as ligand-binding sites. Ligand-binding sites are often conserved among homologous proteins as these sites are critical for protein function.
Binding sites are often located in large pockets, and if their location on a protein’s surface is unknown, it can be predicted using various approaches. The energetic method computationally...
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Experimental Methods for Efficient Solar Hydrogen Production in Microgravity Environment
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効率的な太陽光駆動水素転送 ビスムート基光触媒とエンジニアリングベースサイト

Yitao Dai1,2, Chao Li1, Yanbin Shen3

  • 1SynCat@Beijing, Synfuels China Technology Co. Ltd. , Leyuan South Street II, No. 1, Yanqi Economic Development Zone C# , Huairou District, Beijing 101407 , China.

Journal of the American Chemical Society
|November 6, 2018
PubMed
まとめ
この要約は機械生成です。

新しいビスムート・オキシブロミド材料は 可視光の下での光触媒的水素移転反応を効率的に駆動します この高貴な金属の無い触媒は 高い量子効率と安定性を示し 産業用途の可能性を秘めています

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Integration of Light Trapping Silver Nanostructures in Hydrogenated Microcrystalline Silicon Solar Cells by Transfer Printing
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Solution-Processed "Silver-Bismuth-Iodine" Ternary Thin Films for Lead-Free Photovoltaic Absorbers

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科学分野:

  • 材料科学
  • 光触媒
  • 有機化学

背景:

  • 水素移転 (HT) を含む光触媒的有機変換は極めて重要であるが,しばしば可視光の下での低効率性と選択性によって制限される.
  • 効率的で安定した光触媒の開発は 持続可能な化学合成に不可欠です

研究 の 目的:

  • 新しい高貴金属フリービスムス・オキシブロミド 光触媒を改良する
  • 可視光照射下での様々な光触媒的水素移転反応における効率と選択性を調査する.

主な方法:

  • ベースサイトで合成されたビスマスオキシブロミド [Bi24O31Br10 ((OH) δ) ]の合成.
  • 光触媒の可視光下での還元 (ニトロベンゼンからアゾ/アゾキシベンゼン) と酸化 (キノンからキノール,チオンからチオール,アルコールからケトン) 反応の試験
  • 量子効率の定量化と安定性と拡張性の評価

主要な成果:

  • 開発されたBi24O31Br10(OH)δ光触媒は,還元反応と酸化反応の両方でHTステップを効果的に加速します.
  • 42% (410 nm) と32% (450 nm) の高い量子効率は,ニトロベンゼン還元のために達成されました.
  • この材料は,可視光と太陽光照射下でのスケールアップと安定性において優れた性能を示した.

結論:

  • ベーシックサイトで製造されたビスマスオキシブロミドは,水素移転反応のための高効率で安定した貴金属フリー光触媒です.
  • この材料は,性能と安定性により,工業的な用途に重要な経済的可能性を秘めています.