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相关概念视频

Cohesion01:07

Cohesion

Cohesion is the attraction between molecules of the same type, such as water molecules. Water molecules have an overall neutral charge but are polar molecule. An oxygen atom in one water molecule has a partial negative charge that can bind to a hydrogen atom with a partial positive charge in a second water molecule, forming a hydrogen bond. Each water molecule can form up to four hydrogen bonds with other water molecules. Hydrogen bonds are responsible for water's cohesive nature.
On a surface,...
What are Lipids?01:38

What are Lipids?

Overview
Molecular Comparison of Gases, Liquids, and Solids02:26

Molecular Comparison of Gases, Liquids, and Solids

Particles in a solid are tightly packed together (fixed shape) and often arranged in a regular pattern; in a liquid, they are close together with no regular arrangement (no fixed shape); in a gas, they are far apart with no regular arrangement (no fixed shape). Particles in a solid vibrate about fixed positions (cannot flow) and do not generally move in relation to one another; in a liquid, they move past each other (can flow) but remain in essentially constant contact; in a gas, they move...
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.
To break or to melt a covalent network solid, covalent bonds must be broken. Because covalent bonds are relatively strong, covalent network solids are typically...
What are Lipids?01:31

What are Lipids?

Lipids function as structural components of cellular membranes, in addition to acting as energy reservoirs and signaling molecules. They are thus crucial to all living organisms.  The three biologically important classes of lipids are triglycerides, phospholipids, and steroids.
Non-Polar and Hydrophobic Characteristics of Lipids
Lipids are a structurally and functionally diverse group of hydrocarbons—compounds consisting of carbon and hydrogen atoms. The carbon-carbon and carbon-hydrogen bonds...
Two Components: Liquid–Liquid Systems01:27

Two Components: Liquid–Liquid Systems

A pressure-composition phase diagram explicitly describes the behavior of an ideal solution of two volatile liquids under varying pressures and compositions. A pressure-composition diagram has two main curves. The bubble point curve represents the plot of pressure versus liquid mole fraction. It indicates the pressure at which the first bubble of vapor forms from the liquid phase as the system pressure decreases.The dew point curve is the pressure versus vapor mole fraction. It indicates the...

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相关实验视频

Updated: Jul 7, 2026

Atomic Force Microscopy Imaging and Force Spectroscopy of Supported Lipid Bilayers
10:15

Atomic Force Microscopy Imaging and Force Spectroscopy of Supported Lipid Bilayers

Published on: July 22, 2015

创建液体和空气稳定的固体支的脂质双层.

Matthew A Holden1, Seung-Yong Jung, Tinglu Yang

  • 1Department of Chemistry, Texas A&M University, College Station, Texas 77843, USA.

Journal of the American Chemical Society
|May 27, 2004
PubMed
概括
此摘要是机器生成的。

蛋白质单层保护固体支的脂质双层免受空气诱导的分层. 这允许再水和恢复脂质流动性,这对生物膜稳定性至关重要.

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科学领域:

  • 生物物理学的生物物理.
  • 材料科学 材料科学 材料科学
  • 表面化学 表面化学

背景情况:

  • 固体支持脂质双层 (SSLBs) 是细胞膜的重要模型.
  • SSLB易于在空气/水接口处快速分层,这限制了它们的应用.
  • 了解双层稳定性对于开发强大的膜模拟物至关重要.

研究的目的:

  • 调查一种方法,以防止SSLB在空气/水接口上的分层.
  • 阐明蛋白质单层保护SSLB的机制.
  • 在干燥和再水后评估受保护的SSLB的结构和动态完整性.

主要方法:

  • 形成受蛋白质保护的SSLBs.
  • 通过空气/水接口绘制蛋白质保护的SSLB.
  • 使用流干燥受保护的SSLB.
  • 使用光显微镜评估双层完整性.
  • 在光漂白 (FRAP) 后通过光恢复探测脂质流动性.

主要成果:

  • 一个密集的蛋白质单层有效地防止了SSLB在空气/水接口上的分层.
  • 蛋白质保护保持了薄薄的水层,防止直接与空气接触.
  • 干燥,蛋白质保护的SSLB保持完整,可以再水.
  • 脂质流动性在干燥条件下丧失,但在补水后恢复到91%.
  • 脂质扩散在潮湿的条件下比散装水慢,但在干燥后恢复.

结论:

  • 特别结合的蛋白质单层为SSLB提供了强大的保护,防止空气诱导的分层.
  • 保护机制包括保持水化层和在干燥时保持双层结构.
  • 蛋白质保护的SSLB表现出显著的稳定性和可逆性,使其能够在各种环境中使用.