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関連する概念動画

The Supercomplexes in the Crista Membrane01:41

The Supercomplexes in the Crista Membrane

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...
Mechanisms of Membrane Domain Formation00:59

Mechanisms of Membrane Domain Formation

Different physical properties of lipids and proteins allow them to localize and form distinct islands or domains in the membrane. Some membrane domains are formed due to protein-protein interactions, whereas others are formed due to the presence of specific lipids such as sphingolipids and sterols—for example, large proteins, such as bacteriorhodopsin, aggregate and create distinct domains.
Another mechanism for membrane domain formation involves membrane proteins interacting with cytoskeletal...
Structure of Porins01:21

Structure of Porins

Mitochondria, chloroplasts, and gram-negative bacteria have transmembrane, beta-barrel proteins called porins to mediate the free diffusion of ions and metabolites across the membrane. Mitochondrial porin precursors contain conserved amino acid sequences called beta signals at their C-terminal. Beta signals have a  motif of PoXGXXHyXHy (Po-Polar, X-Any amino acid, G-Glycine, Hy-LargeHydrophobic), which are crucial for precursor recognition to initiate precursor assembly. Beta-barrel precursors...
Tight Junctions01:29

Tight Junctions

Tight junctions are molecular seals between cells that prevent the leaking of fluids, ions, and other small solutes across cavities and compartments in multicellular organisms. They are mainly composed of claudin and occludin transmembrane proteins, and other proteins such as tricellulin and JAM (junctional adhesion molecule). All these proteins are 4-pass transmembrane proteins, except JAM, which is a single-pass transmembrane protein belonging to the immunoglobulin superfamily. The...
Imperfections in Crystal Structure: Stoichiometric Point Defects01:26

Imperfections in Crystal Structure: Stoichiometric Point Defects

Schottky defects arise when some lattice points in a crystal, such as those in NaCl, remain unoccupied, creating lattice vacancies without disturbing the overall electrical neutrality of the crystal. This defect is common in ionic crystals where the positive and negative ions are similar in size, as seen in sodium chloride and cesium chloride. The presence of Schottky defects enables the crystal to conduct electricity to a small extent through an ionic mechanism. Electric fields cause nearby...

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関連する実験動画

Updated: Jun 22, 2026

Electrophoretic Crystallization of Ultrathin High-performance Metal-organic Framework Membranes
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モノミセルインターフェース・コンフィネッド・アセンブリによるユニークなメソポラス・カーボン・スーパーストラクチャの構築

Zaiwang Zhao1, Linlin Duan1, Yujuan Zhao2

  • 1Department of Chemistry, Laboratory of Advanced Materials, Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials, iChEM and State Key Laboratory of Molecular Engineering of Polymers, College of Chemistry and Materials, Fudan University, Shanghai 200433, P. R. China.

Journal of the American Chemical Society
|June 22, 2022
PubMed
まとめ

研究者は,単細胞インターフェースアセンブリを使用して,新しい3DメソポラスN-ドープされた炭素上部構造を開発しました. この材料は,高表面積と酸素還元反応 (ORR) の優れた性能を提供します.

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関連する実験動画

Last Updated: Jun 22, 2026

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科学分野:

  • 材料科学
  • ナノテクノロジー
  • 電気化学

背景:

  • 制御された多孔性と機能性を持つ階層的な3Dメソストラクチャは,合成することが困難です.
  • 既存の材料には 十分な表面積と 互いにつながった孔のネットワークが 欠けていることが多いのです

研究 の 目的:

  • 調整可能な性質を持つ新しい3DメソポラスなN-ドープされた炭素上部構造を開発する.
  • 先進的な電気触媒材料としての可能性を探るため

主な方法:

  • モノミケルのインターフェースは 閉じ込められたアセンブリアプローチです
  • 中央の空洞と球形のメソポールの階層構造の製造.
  • 毛穴の構造,表面積,形状の特徴

主要な成果:

  • 前例のない 3D メソポラスな N-ドーピングカーボン・スーパーストラクチャを 互いにつながった孔で達成した.
  • 展示されている超高度のアクセス可能な表面面積 (685 m2 g−1)
  • 制御可能なメソポールの数,粒子の大きさ,殻の厚さ.
  • 3Dの空洞なナノベシクルや 2Dのナノシートなどの他の構成が得られました

結論:

  • 開発された上部構造は,酸素還元反応 (ORR) の先進的な電気触媒として有望である.
  • 商用Pt/Cに匹敵する0.82Vの半波電位を達成した.
  • ORRにとって顕著な耐久性を示し,エネルギーアプリケーションにおけるその可能性を強調した.