関連する実験動画

Updated: Jan 29, 2026

Microfluidic-based Synthesis of Covalent Organic Frameworks COFs: A Tool for Continuous Production of COF Fibers and Direct Printing on a Surface
08:42

Microfluidic-based Synthesis of Covalent Organic Frameworks COFs: A Tool for Continuous Production of COF Fibers and Direct Printing on a Surface

Published on: July 10, 2017

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触媒抗酸化剤としての3次元コヴァレンント有機フレームワーク

Shichen Yan1, Xinyu Guan1, Hui Li1

  • 1State Key Laboratory of Inorganic Synthesis and Preparative Chemistry , Jilin University , Changchun 130012 , P. R. China.

Journal of the American Chemical Society
|February 6, 2019
PubMed
まとめ

研究者らは,サルフェンリガンドを用いた新しい3D機能化された共性有機フレームワーク (COF) を開発した. この高度な材料は 生物学や医学で 特に有害な超酸化素の除去に 有望な応用が見られます

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Development of Heterogeneous Enantioselective Catalysts using Chiral Metal-Organic Frameworks MOFs08:25

Development of Heterogeneous Enantioselective Catalysts using Chiral Metal-Organic Frameworks MOFs

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Synthesis and Characterization of Functionalized Metal-organic Frameworks11:27

Synthesis and Characterization of Functionalized Metal-organic Frameworks

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Network Covalent Solids02:18

Network Covalent Solids

Network covalent solids contain a three-dimensional network of covalently bonded atoms as found in the crystal structures of nonmetals like diamond, graphite, silicon, and some covalent compounds, such as silicon dioxide (sand) and silicon carbide (carborundum, the abrasive on sandpaper). Many minerals have networks of covalent bonds.
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Covalent Bonds

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Covalent Bonds01:08

Covalent Bonds

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When two atoms share electrons to complete their valence shells, they create a covalent bond. An atom's electronegativity—the force with which shared electrons are pulled towards an atom—determines how the electrons are shared. Molecules formed with covalent bonds can be either polar or nonpolar. Atoms with similar electronegativities form nonpolar covalent bonds; the electrons are shared equally. Atoms with different electronegativities share electrons unequally,...
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These groups modify specific amino acids in a protein....
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Compared to ionic bonds, which results from the transfer of electrons between metallic and nonmetallic atoms, covalent bonds result from the mutual attraction of atoms for a “shared” pair of electrons.
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Turnover Number and Catalytic Efficiency

The turnover number of an enzyme is the maximum number of substrate molecules it can transform per unit time. Turnover numbers for most enzymes range from 1 to 1000 molecules per second. Catalase has the known highest turnover number, capable of converting up to 2.8×106 molecules of hydrogen peroxide into water and oxygen per second. Lysozyme has the lowest known turnover number of half a molecule per second.
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