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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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Labeling DNA Probes03:31

Labeling DNA Probes

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DNA probes are fragments of DNA labeled with a reporter tag to enable their detection or purification. The resulting labeled DNA probes can then hybridize to target nucleic acid sequences through complementary base-pairing, and may be used to recover or identify these regions.
Radioisotopes, fluorophores, or small molecule binding partners like biotin or digoxigenin, are the most widely used reporter tags for labeling DNA probes. These labels can be attached to the probe DNA molecule via...
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Updated: Jun 11, 2025

Imaging Molecular Adhesion in Cell Rolling by Adhesion Footprint Assay
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Imaging Molecular Adhesion in Cell Rolling by Adhesion Footprint Assay

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跳跃和爬行DNA涂层的合体.

Jeana Aojie Zheng1, Miranda Holmes-Cerfon2, David J Pine1,3

  • 1Department of Physics, New York University, New York, NY 10003.

Proceedings of the National Academy of Sciences of the United States of America
|October 1, 2024
PubMed
概括

用DNA涂层的合体在靠近表面的跳跃和爬行运动之间切换. 较低的温度有利于爬行,这是更有效地覆盖距离,由于增加了链结合防止脱落.

关键词:
它们是DNA DNA DNA DNA.合物 合物 合物扩散扩散是一种扩散.多价联体受体的多价联体受体.亚扩散子扩散是一个问题.

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科学领域:

  • 合体和表面科学科学
  • 生物材料工程 生物材料工程
  • 纳米技术纳米技术

背景情况:

  • 了解粒子运动,特别是DNA涂层合体,对于生物医学应用和材料设计至关重要.
  • 现有研究表明,看似相似的粒子表现出不同的运动性 (跳跃或滚动),造成了模两可.

研究的目的:

  • 为了研究DNA涂层合体在互补表面附近的独特运动模式.
  • 阐明影响跳跃和爬行行为之间的转换的因素.

主要方法:

  • 观察DNA涂层的合体在表面附近扩散,具有不同的互补链密度.
  • 在点周围的不同温度下分析粒子轨迹.

主要成果:

  • 体体表现出两种不同的模式之间的快速切换:跳跃 (长,快速的步骤) 和爬行 (短,缓慢的步骤).
  • 这两种模式都在各种温度和涂层设计中观察到.
  • 颗粒子扩散随着温度的下降而增加,与速度阶段反相对应和轨道回转相关联.
  • 在较低的温度下,爬行更为主导和高效,而在较高的温度下,跳跃更受欢迎.

结论:

  • 观察到的运动模式是由一个模型合理化,其中在较低温度下增加的链结合防止脱离,有利于爬行.
  • 密集的表面线条对于使爬行成为可能至关重要,这种机制可能有助于长距离的自我组装和粒子重排.