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相关概念视频

Behavior of Gas Molecules: Molecular Diffusion, Mean Free Path, and Effusion03:48

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Although gaseous molecules travel at tremendous speeds (hundreds of meters per second), they collide with other gaseous molecules and travel in many different directions before reaching the desired target. At room temperature, a gaseous molecule will experience billions of collisions per second. The mean free path is the average distance a molecule travels between collisions. The mean free path increases with decreasing pressure; in general, the mean free path for a gaseous molecule will be...
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Different fluorescence-based techniques are used to study the protein dynamics in living cells. These techniques include FRAP, FRET, and PET.
Fluorescent recovery after photobleaching (FRAP) is a fluorescent-protein-based detection technique used to quantify protein movement rates within the cell. This method exposes a small portion of the cell to an intense laser beam. The laser beam causes permanent photobleaching of the fluorophore-tagged proteins in the exposed region. As the bleached...
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Consider the gas molecules in a cylinder. They move in a random motion as they collide with each other and change speed and direction. The average of all the path lengths between collisions is known as the "mean free path."
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Passive diffusion is a critical process that allows small lipophilic drugs to cross the cell membrane along a concentration gradient. This mechanism's efficiency depends on four primary factors: the membrane's surface area, the drug's lipid-water partition coefficient, the concentration gradient, and the membrane's thickness.
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Updated: Jul 23, 2025

Image Processing Protocol for the Analysis of the Diffusion and Cluster Size of Membrane Receptors by Fluorescence Microscopy
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从扩散单个分子中分析光子轨迹.

Irina V Gopich1, Jae-Yeol Kim1, Hoi Sung Chung1

  • 1Laboratory of Chemical Physics, National Institute of Diabetes and Digestive and Kidney Diseases, National Institutes of Health, Bethesda, Maryland 20892, USA.

The Journal of chemical physics
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PubMed
概括
此摘要是机器生成的。

新的方法准确地分析来自单个分子在溶液中扩散的光子爆发. 这提高了分子亮度和扩散系数的确定,这对于理解生物物理学中的分子行为至关重要.

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Synthesis of Cyclic Polymers and Characterization of Their Diffusive Motion in the Melt State at the Single Molecule Level
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Last Updated: Jul 23, 2025

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科学领域:

  • 生物物理学的生物物理.
  • 物理化学 物理化学
  • 分析化学 分析化学

背景情况:

  • 单分子实验检测到当分子通过激光点时发出的光子.
  • 只有光子爆发才能提供有意义的数据,需要谨慎的选择标准.
  • 现有的分析方法可能无法完全解释爆发选择偏差.

研究的目的:

  • 开发新的分析方法,准确地确定从选定的光子爆发中分子亮度和扩散率.
  • 为了考虑到数据分析中突发选择标准引入的偏差.
  • 为分析单分子扩散研究中的光子到达时间数据提供可靠的方法.

主要方法:

  • 对光子爆发分布 (光子间时间,光子计数) 的分析表达式的推导.
  • 开发数据分析的最大概率 (ML) 方法:burstML,iptML和pcML.
  • 使用模拟的光子轨迹和实验数据 (Atto 488光体) 的验证.

主要成果:

  • 新的理论框架准确地模拟了光子爆发统计数据,包括选择偏差.
  • 使用ML方法证明了光子计数率和扩散系数的准确确定.
  • 对模拟和实验单分子扩散数据的成功应用.

结论:

  • 提出的方法提供了对单分子扩散数据的准确和偏差纠正的分析.
  • 这些工具增强了从光子爆发分析中对分子性质的定量理解.
  • 该研究为涉及单个分子的生物物理和化学研究提供了改进的方法.