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相关概念视频

Multi-pass Transmembrane Proteins and β-barrels01:09

Multi-pass Transmembrane Proteins and β-barrels

In multi-pass transmembrane proteins, the polypeptide chain crosses the membrane more than once. The transmembrane polypeptide chain either forms an α-helix or β-strand structure. α-Helix containing multi-pass transmembrane proteins are ubiquitous, whereas β-strand containing ones are mainly found in gram-negative bacteria, mitochondria, and chloroplasts.
α-Helix containing multi-pass transmembrane proteins
Multi-pass transmembrane proteins such as G-protein-linked receptors (GPCRs) and...
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...
Mechanisms of Membrane-bending01:15

Mechanisms of Membrane-bending

The living membranes are flexible due to their fluid mosaic nature; however, their bending into different shapes is an active process regulated by specific lipids and proteins. The membrane bending can be transient as seen in vesicles or stable for a long time as in microvilli. Cells regulate the size, location, and duration of the membrane curvature.
Membrane bending can happen due to intrinsic changes in lipid composition or extrinsic association with different proteins. The proteins involved...
Aquaporins01:25

Aquaporins

Aquaporins or AQPs are a family of integral membrane proteins whose primary function is to transport water, while some called aquaglyceroporins also transport glycerol. In addition, aquaporins have also been suspected to be involved in transporting volatile substances, such as carbon dioxide and ammonia, across membranes. Such AQPs that act as gas channels are often highly expressed in cells involved in the gaseous exchange, such as red blood cells, epithelial cells, and pulmonary capillaries.
Single-Strand DNA Binding Proteins01:03

Single-Strand DNA Binding Proteins

For successful DNA replication, the unwinding of double-stranded DNA must be accompanied by stabilization and protection of the separated single strands of the DNA. This crucial task is performed by single-strand DNA-binding (SSB) proteins. They bind to the DNA in a sequence-independent manner, which means that the nitrogenous bases of the DNA need not be present in a specific order for binding of SSB proteins to it. The binding of SSB proteins straightens single-stranded DNA (ssDNA) and makes...
Molecular Shapes01:18

Molecular Shapes

Molecules have characteristic shapes that are crucial for their function. The arrangement of various electron groups around the central atom dictates their molecular geometry. Electron pairs in the valence shell of a central atom will adopt an arrangement that minimizes repulsions between the electron pairs by maximizing the distance between them. The valence electrons form either bonding pairs, located primarily between bonded atoms, or lone pairs.Two regions of electron density in a diatomic...

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相关实验视频

Updated: Jun 1, 2026

High-Speed Magnetic Tweezers for Nanomechanical Measurements on Force-Sensitive Elements
08:50

High-Speed Magnetic Tweezers for Nanomechanical Measurements on Force-Sensitive Elements

Published on: May 12, 2023

一维的分子拉链.

Hyo Won Kim1, Jaehoon Jung, Mina Han

  • 1Department of Physics and Astronomy, Seoul National University, Seoul 151-747, Korea.

Journal of the American Chemical Society
|May 20, 2011
PubMed
概括

研究人员使用阿佐本衍生物创建了一个一维的分子拉链. 这项研究揭示了组合的结合和范德瓦尔斯相互作用驱动金面上的拉链形成.

科学领域:

  • 表面科学是一门学科.
  • 超分子化学 超分子化学
  • 材料科学 材料科学 材料科学

背景情况:

  • 分子拉链是自组装结构,在纳米技术中具有潜在的应用.
  • 了解控制它们形成的分子间力量对于设计先进材料至关重要.

研究的目的:

  • 合成一种能够形成一维分子拉链的新型亚博烯衍生物.
  • 阐明由特定的分子间相互作用驱动的分子拉链形成的机制.

主要方法:

  • 合成一种定制的阿佐本衍生物.
  • 使用扫描道显微镜 (STM) 在黄金表面上进行表面表征.
  • 使用密度函数理论 (DFT) 计算进行理论研究.

主要成果:

  • 成功合成了亚博烯衍生物.
  • 在Au111表面上观察一维分子拉链的形成.
  • 确定协同结和范德瓦尔斯力作为自我组装的关键驱动力.

结论:

  • 合成的亚博烯衍生物有效地形成一维的分子拉链.
  • 该研究提供了关于联合非共价相互作用在指导分子自我组装中的作用的基本见解.

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Stable DNA Motifs, 1D and 2D Nanostructures Constructed from Small Circular DNA Molecules
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Stable DNA Motifs, 1D and 2D Nanostructures Constructed from Small Circular DNA Molecules

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High-Speed Magnetic Tweezers for Nanomechanical Measurements on Force-Sensitive Elements
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High-Speed Magnetic Tweezers for Nanomechanical Measurements on Force-Sensitive Elements

Published on: May 12, 2023

A Simple, Robust, and High Throughput Single Molecule Flow Stretching Assay Implementation for Studying Transport of Molecules Along DNA
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A Simple, Robust, and High Throughput Single Molecule Flow Stretching Assay Implementation for Studying Transport of Molecules Along DNA

Published on: October 1, 2017

Stable DNA Motifs, 1D and 2D Nanostructures Constructed from Small Circular DNA Molecules
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Stable DNA Motifs, 1D and 2D Nanostructures Constructed from Small Circular DNA Molecules

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