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Related Concept Videos

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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Spiral Square Nanosheets Assembled from Ru Clusters.

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
Summary
This summary is machine-generated.

Researchers developed a novel method using screw dislocation to create 2D spiral cluster assembled nanosheets (CANs) from ruthenium (Ru) clusters. These unique spiral nanostructures show promising photothermal conversion performance in the near-infrared region.

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Chemistry

Background:

  • Spiral two-dimensional (2D) nanosheets possess unique properties due to their twisted structures.
  • Forming hierarchical 2D structures via cluster self-assembly is ideal but challenging for spiral nanosheets.

Purpose of the Study:

  • To report a novel method for synthesizing 2D spiral cluster assembled nanosheets (CANs) with uniform square morphology.
  • To investigate the structure, assembly, and properties of these novel spiral nanosheets.

Main Methods:

  • Utilized a screw dislocation-involved assembly method.
  • Prepared 2D spiral ruthenium (Ru) CANs (approx. 4 μm length, 20.7 ± 3.0 nm thickness per layer) from 1-2 nm Ru clusters and Pluronic F127.
  • Employed cryo-electron microscopy (cryo-EM) and HAADF-STEM to confirm screw dislocation.
  • Analyzed cluster speciation and coordination using X-ray absorption fine structure (XAFS).
  • Investigated noncovalent interactions (hydrogen bonding, hydrophilic interactions) via FT-IR and 1H NMR.

Main Results:

  • Successfully synthesized uniform square 2D spiral Ru CANs.
  • Confirmed the presence of screw dislocation in the assembled spiral structures.
  • Identified Ru clusters as Ru3+ species coordinated with Cl (coordination number 6.5).
  • Determined that noncovalent interactions drive the assembly process.
  • Demonstrated excellent photothermal conversion performance in the near-infrared (NIR) region.

Conclusions:

  • A novel screw dislocation-involved assembly method enables the formation of 2D spiral CANs.
  • The synthesized Ru-F127 CANs possess unique structural characteristics and exhibit promising NIR photothermal conversion capabilities.