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相关概念视频

Cryo-electron Microscopy01:28

Cryo-electron Microscopy

Conventional electron microscopy (EM) involves dehydration, fixation, and staining of biological samples, which distorts the native state of biological molecules and results in several artifacts. Also, the high-energy electron beam damages the sample and makes it difficult to obtain high-resolution images. These issues can be addressed using cryo-EM, which uses frozen samples and gentler electron beams. The technique was developed by Jacques Dubochet, Joachim Frank, and Richard Henderson, for...

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相关实验视频

Updated: Jun 15, 2026

Author Spotlight: Unraveling the Dynamics of Eukaryotic DNA Replication Through Single-Molecule Visualization
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使用液细胞电子显微镜成像DNA构造时的ergodicity问题.

Jia-Ye Li1, Fan Liu1,2, Jing Xu1,2

  • 1Beijing National Laboratory for Molecular Sciences, College of Chemistry and Molecular Engineering, National Biomedical Imaging Center, Key Laboratory of Polymer Chemistry & Physics of Ministry of Education, Peking University, Beijing 100871, China.

Proceedings of the National Academy of Sciences of the United States of America
|January 9, 2024
PubMed
概括

石墨烯液细胞电子显微镜显示,圆形DNA循环相互转换是可逆的. 这种技术就像一个慢动画摄像头一样,在低电子剂量下显示平衡的DNA循环分布.

关键词:
这就是TEMEM.侵蚀性 侵蚀性 侵蚀性石墨烯液细胞液体细胞

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相关实验视频

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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
  • 电子显微镜电子显微镜

背景情况:

  • 石墨烯液细胞电子显微镜 (GLCEM) 提供了一种新的方法来研究溶液中的生物分子.
  • 了解这些测量的ergodicity对于验证它们的结果至关重要.

研究的目的:

  • 为了评估石墨烯液细胞电子显微镜测量圆形DNA的ergodicity.
  • 为了确定GLCEM中的DNA循环状态是否反映了散装溶液的行为.

主要方法:

  • 使用80keV电子能量和低电子剂量速率 (1-20 e− Å−2 s−1) 进行成像.
  • 分析了石墨烯液体细胞内的圆形DNA分子中循环状态的相互转换和分布.

主要成果:

  • 在循环DNA中观察到循环状态的可逆互转.
  • 证明循环数遵循博尔兹曼分布,与批量溶液行为一致.
  • 在低电子剂量条件下证实了ergodicity.

结论:

  • 石墨烯液细胞电子显微镜是一种用于研究DNA的 ergodic 技术.
  • 该方法充当"慢动作"摄像头,通过时间平均显示平衡的分布.
  • 低电子剂量对于准确表示散装溶液动态至关重要.