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Protein Dynamics in Living Cells01:19

Protein Dynamics in Living Cells

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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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Measurement of Particle Size Distribution in Turbid Solutions by Dynamic Light Scattering Microscopy
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任何方式的动态光散射分布.

Natalia Farkas1,2, John A Kramar2

  • 1Theiss Research, 7411 Eads Ave, La Jolla, CA 92037.

Journal of nanoparticle research : an interdisciplinary forum for nanoscale science and technology
|October 9, 2024
PubMed
概括

纳米粒子的动态光散射 (DLS) 分析需要仔细选择尺寸分布的方法. 这项研究确定了和平均值与累积结果一致,提高了纳米粒子特征的准确性.

科学领域:

  • 纳米技术纳米技术
  • 材料科学 材料科学 材料科学
  • 物理化学 物理化学

背景情况:

  • 动态光散射 (DLS) 是用于纳米粒子大小分析的广泛使用的技术.
  • 目前的DLS实践往往涉及对权重和平均值计算的任意选择,导致不一致.
  • 商业软件和标准中的模糊性需要澄清,以便可靠的纳米粒子表征.

研究的目的:

  • 批判性地评估DLS在纳米粒子表征中的应用.
  • 为了澄清平均值计算和数据在DLS中的呈现方面的模糊性.
  • 为了确定DLS大小分布的一致而准确的中心值.

主要方法:

  • 测量单模纳米粒子样本的尺寸范围为5nm至250nm.
  • 对DLS大小分布的分析,包括默认倒置方法和累积z-平均大小.
  • 验证中心值和对多分散性描述物的调查.

主要成果:

  • 默认的DLS反转方法显示出与累积z-平均大小的显著偏差 (超过15%),取决于多分散性.
  • 调和平均值被确定并验证为强度加权的DLS大小分布的正确中央值.
  • 对于各种纳米粒子类型,DLS多分散性描述器被发现是不可靠和误导性的.
关键词:
在NNLS的反转过程中,NNLS的反转.动态光散射是一种动态光散射.的平均值是指的平均值.转换时刻比转换时刻比转换.多分散性指数 (polydispersity index) 是一个多分散性指数.尺寸分布的大小分布.

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结论:

  • 在DLS分析中选择平均值显著影响解释准确性.
  • 平均值为DLS强度加权大小分布提供了一致且可靠的中心值.
  • 需要对DLS计量能力和标准进行重新评估,以改进纳米粒子表征.