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関連する概念動画

RNA Structure01:23

RNA Structure

Overview
The basic structure of RNA consists of a five-carbon sugar and one of four nitrogenous bases. Although most RNA is single-stranded, it can form complex secondary and tertiary structures. Such structures play essential roles in the regulation of transcription and translation.
Different Types of RNA Have the Same Basic Structure
There are three main types of ribonucleic acid (RNA): messenger RNA (mRNA), transfer RNA (tRNA), and ribosomal RNA (rRNA). All three RNA types consist of a...
RNA Structure01:23

RNA Structure

Overview
The basic structure of RNA consists of a five-carbon sugar and one of four nitrogenous bases. Although most RNA is single-stranded, it can form complex secondary and tertiary structures. Such structures play essential roles in the regulation of transcription and translation.
Different Types of RNA Have the Same Basic Structure
There are three main types of ribonucleic acid (RNA): messenger RNA (mRNA), transfer RNA (tRNA), and ribosomal RNA (rRNA). All three RNA types consist of a...
Pinching-off of Coated Vesicles01:32

Pinching-off of Coated Vesicles

Vesicle budding is orchestrated by distinct cytosolic proteins such as adaptor proteins, coat proteins, and GTPases. To initiate vesicle budding, membrane-bending proteins containing crescent-shaped BAR domains bind to the lipid heads in the bilayer and distort the membrane to form a protein-coated vesicle bud. Adaptors proteins such as AP2 for clathrin-coated vesicles can nucleate on the deformed membrane. Finally, coat proteins such as clathrin or COPI and COPII assemble into a coat forming...
Oligosaccharide Assembly01:24

Oligosaccharide Assembly

Protein glycosylation starts in the ER lumen and continues in the Golgi apparatus. Glycosyltransferases catalyze the addition of sugar molecules or glycosylation of proteins. Usually, these enzymes add sugars to the hydroxyl groups of selected serine or threonine residues to form O-linked glycans or the amino groups of asparagine residues to form N-linked glycans. Different positions on the same polypeptide chain can contain differently linked glycans.
Multiple sugar molecules that may or may...
RNA Structure01:19

RNA Structure

The basic structure of RNA consists of a string of ribonucleotides attached by phosphodiester bonds. Although most RNA is single-stranded, it can form complex secondary and tertiary structures. Such structures play essential roles in the regulation of transcription and translation.
Different Types of RNA Have the Same Basic Structure
There are three main types of ribonucleic acid (RNA) involved in protein synthesis: messenger RNA (mRNA), transfer RNA (tRNA), and ribosomal RNA (rRNA). All three...
Colloidal precipitates01:09

Colloidal precipitates

The high insolubility of some precipitates can result in an unfavorable relative supersaturation. This can lead to colloidal particles with a large surface-to-mass ratio, where adsorption is promoted. For instance, in the precipitation of silver chloride, silver ions are adsorbed on the surface of the colloidal particles, forming a primary layer. This layer attracts ions of opposite charge (such as nitrate ions), forming a diffuse secondary layer of adsorbed ions. This electric double layer...

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Gyroid Nickel Nanostructures from Diblock Copolymer Supramolecules
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Ruクラスターから組み立てられた螺旋型の正方形ナノシート

Haohui Hu1, Xiao Han1, Geng Wu1

  • 1Center of Advanced Nanocatalysis, Department of Applied Chemistry, University of Science and Technology of China, Hefei, Anhui 230026, P. R. China.

Journal of the American Chemical Society
|May 24, 2023
PubMed
まとめ

研究者らは,ルテニウム (Ru) クラスターから2Dのスパイラルクラスターアセンブリドナノシート (CAN) を作成するために,スクリュー脱位を使用する新しい方法を開発しました. これらのユニークな螺旋ナノ構造は,近赤外線領域で有望な光熱変換性能を示しています.

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関連する実験動画

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科学分野:

  • 材料科学
  • ナノテクノロジー
  • 化学について

背景:

  • 螺旋型の二次元 (2D) ナノシートには,その歪んだ構造によりユニークな特性があります.
  • クラスターセルフアセンブリによる階層的な2D構造の形成は理想的ですが,スパイラルナノシートには困難です.

研究 の 目的:

  • 均一な正方形形状を持つ2D渦巻きクラスター組立ナノシート (CAN) の合成のための新しい方法を報告する.
  • これらの新型の螺旋ナノシートの構造,組み立て,および性質を調査します.

主な方法:

  • スクリュー・ディスロケーションによる組立法を使用した.
  • 2Dスパイラルルテニウム (Ru) CAN (約. 4μmの長さ,1層あたり20.7 ±3.0 nmの厚さ) から1〜2nmのRu群とPluronic F127から.
  • クリオ電子顕微鏡 (Cryo-EM) とHAADF-STEMを用いて,スクルーの変位を確認した.
  • X線吸収微細構造 (XAFS) を用いてクラスターの種化と調整を分析した.
  • FT-IRと1H NMRによる非共性相互作用 (水素結合,水性相互作用) を調査した.

主要な成果:

  • 正方形2Dの渦巻きの Ru CAN を成功して合成した.
  • 組み立てられた螺旋構造に スクリューの変位が確認されました
  • 特定されたRuクラスターは,Clと調整されたRu3+種 (調整番号6.5) です.
  • 非共性相互作用が組み立てプロセスを動かすことを決定した.
  • 近赤外線 (NIR) 領域で優れた光熱変換性能を示した.

結論:

  • 新しい螺旋変位を含む組立方法により,2DのスパイラルCANが形成されます.
  • 合成されたRu-F127 CANは,ユニークな構造特性を有し,NIR光熱変換能力を有しています.