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Radical Autoxidation01:20

Radical Autoxidation

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The oxidation of an organic compound in the presence of air or oxygen is called autoxidation. For example, cumene reacts with oxygen to form hydroperoxide. Autoxidation involves initiation, propagation, and termination steps. Many organic compounds are susceptible to autoxidation—especially ethers in the presence of oxygen, which form hydroperoxides. Even though this reaction is slow, old ether bottles contain small amounts of peroxide, which leads to laboratory explosions during ether...
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Oxidation and Reduction of Organic Molecules01:19

Oxidation and Reduction of Organic Molecules

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Energy production within a cell involves many coordinated chemical pathways. Most of these pathways are combinations of oxidation and reduction reactions, which occur at the same time. An oxidation reaction strips an electron from an atom in a compound, and the addition of this electron to another compound is a reduction reaction. Because oxidation and reduction usually occur together, these pairs of reactions are called redox reactions.
The removal of an electron from a molecule, results in a...
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ATP and Macromolecule Synthesis01:28

ATP and Macromolecule Synthesis

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Biological macromolecules are organic compounds, predominantly composed of carbon atoms. The carbon atoms are covalently bonded with hydrogen, oxygen, nitrogen, and other minor elements. There are four major biological macromolecule classes: carbohydrates, lipids, proteins, and nucleic acids.
Most macromolecules are composed of single subunits, or building blocks, called monomers. The monomers combine with each other using covalent bonds to form larger molecules known as polymers.
Conversion of...
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Anionic Chain-Growth Polymerization: Mechanism01:04

Anionic Chain-Growth Polymerization: Mechanism

2.2K
The mechanism for anionic chain-growth polymerization involves initiation, propagation, and termination steps. In the initiation step, a nucleophilic anion, such as butyl lithium, initiates the polymerization process by attacking the π bond of the vinylic monomer. As a result, a carbanion, stabilized by the electron‐withdrawing group, is generated. The resulting carbanion acts as a Michael donor in the propagation step and attacks the second vinylic monomer, which acts as a Michael...
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Free-Radical Chain Reaction and Polymerization of Alkenes02:35

Free-Radical Chain Reaction and Polymerization of Alkenes

8.6K
The conversion of alkenes to macromolecules called polymers is a reaction of high commercial importance. The structure of the polymer is defined by a repeating unit, while the terminal groups are considered insignificant. The average degree of polymerization represents the number of repeating units in the polymer molecule and is denoted by the subscript n.
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Oxygenic Photosynthesis01:26

Oxygenic Photosynthesis

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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...
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関連する実験動画

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Visualizing the Effects of Oxidative Damage on Drosophila Egg Chambers using Live Imaging
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生体細胞における酸化ポリメリゼーション

Yiheng Dai1, Tianyu Li2, Zhiheng Zhang1

  • 1Key Lab of Organic Optoelectronics & Molecular Engineering, Department of Chemistry, Tsinghua University, Beijing 100084, People's Republic of China.

Journal of the American Chemical Society
|June 23, 2021
PubMed
まとめ
この要約は機械生成です。

科学者はオルガノテルリドを用いた 新しい細胞内ポリメリゼーション反応を開発した. この反応は反応性酸素種 (ROS) によって引き起こされ,がん細胞を選択的に標的とし,アポトーシスを誘発し,がん治療の新たな戦略を提供します.

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Controlled Photoredox Ring-Opening Polymerization of O-Carboxyanhydrides Mediated by Ni/Zn Complexes
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科学分野:

  • 化学生物学
  • 生物医学工学
  • 材料科学

背景:

  • 細胞内ポリメリゼーションは 細胞の行動を調節するための有望な技術です
  • 細胞環境は制御されたポリメリゼーションに重大な課題を提示する.
  • オルガノテルリドは,新しい反応のためのユニークな化学的特性を提供します.

研究 の 目的:

  • 細胞内で刺激から独立した新種の酸化ポリメリゼーション反応を 開発する.
  • 標的型ポリメリゼーションのための細胞内リドックス環境を活用する.
  • ガン細胞のアポトーシス誘導の可能性を調査する.

主な方法:

  • 細胞内ポリメリゼーションに用いるオルガノテルリド.
  • 細胞内反応性酸素種 (ROS) 環境をトリガーとして利用した.
  • 自己増幅によるポリメリゼーション誘発アポトーシスのメカニズムを調査した.
  • セレノプロテインと抗酸化システムの相互作用を評価した.
  • 抗がん効果と生体安全性を in vitro と in vivo で評価した.

主要な成果:

  • 細胞内ROSで制御可能な新しい酸化ポリメリゼーション反応を開発した.
  • がん細胞の選択的ポリメリゼーションとアポトーシス誘導が実証されています.
  • 抗酸化システムとセレノプロテインの 破壊を伴う自己増強メカニズムを特定した
  • 選択的抗がん効果とバイオセーフティが in vitro と in vivo で確認されています.

結論:

  • 細胞内ポリメリゼーションが内生的なROSによって引き起こされ,選択的な癌細胞標的化が可能になりました.
  • 癌細胞におけるアポトーシスの誘発のための新しい自己増強メカニズムを確立した.
  • 細胞増殖とアポトーシスを操作する 新しい化学的戦略を提示し 治療的な応用が可能です