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相关概念视频

Preparation of Samples for Electron Microscopy01:20

Preparation of Samples for Electron Microscopy

5.3K
To be visualized by an electron microscope, either transmission or scanning, biological samples need to be fixed (stabilized) so the electron beam does not destroy them and dried thoroughly (desiccated/dehydrated) so the vacuum does not affect them. Fixation needs to be done as quickly as possible because the sample properties will start changing as soon as it is removed from its natural environment. For example, in a tissue sample, the oxygen levels begin decreasing, causing an altered...
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Cryo-electron Microscopy01:28

Cryo-electron Microscopy

3.2K
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: May 9, 2025

Optimizing Sample Preparation for Cryogenic Electron Microscopy
06:38

Optimizing Sample Preparation for Cryogenic Electron Microscopy

Published on: April 11, 2025

186

为低温电子显微镜优化样品准备方法

Joohyun Lee1, Truc Kim2, Kyeong Kyu Kim3

  • 1Department of Precision Medicine, Graduate School of Basic Medical Science (GSBMS), Institute for Antimicrobial Resistance Research and Therapeutics, Sungkyunkwan University School of Medicine.

Journal of visualized experiments : JoVE
|April 28, 2025
PubMed
概括

低温电子显微镜 (cryo-EM) 与粒子分布不均而斗争,影响蛋白质结构分辨率. 本研究提出了一种实用的样本制备方法,以实现更高质量的冷电磁结构的均粒子分布.

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Miniaturized Sample Preparation for Transmission Electron Microscopy
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Miniaturized Sample Preparation for Transmission Electron Microscopy

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Cryo-electron Microscopy Specimen Preparation By Means Of a Focused Ion Beam

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相关实验视频

Last Updated: May 9, 2025

Optimizing Sample Preparation for Cryogenic Electron Microscopy
06:38

Optimizing Sample Preparation for Cryogenic Electron Microscopy

Published on: April 11, 2025

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Miniaturized Sample Preparation for Transmission Electron Microscopy
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Miniaturized Sample Preparation for Transmission Electron Microscopy

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科学领域:

  • 结构生物学 结构生物学
  • 生物物理学的生物物理.
  • 生物化学 生物化学

背景情况:

  • 低温电子显微镜 (cryo-EM) 可视化了接近原生状态的宏分子结构.
  • 单粒子分析和计算方面的进步使冷EM变得至关重要.
  • 不均的粒子分布是一个关键的挑战,降低了冷EM的分辨率和精度.

研究的目的:

  • 介绍一种实用方法,以优化冷EM中的样品制备.
  • 为了应对粒子分布不均的挑战.
  • 使用冷EM改造蛋白质结构的质量提高.

主要方法:

  • 开发了一种样本制备技术,以尽量减少偏向吸附.
  • 作为一个模型系统,利用了Methanocaldococcus jannaschii (MjsHSP16.5) 的小热冲击蛋白.
  • 专注于在冷电磁电网上实现均粒子分布.

主要成果:

  • 优化的样本制备导致了更均的颗粒分布.
  • 将生物分子的偏好吸附量降至最低.
  • 促进了更高质量的冷EM结构重建.

结论:

  • 提出的方法提供了一种实际的解决方案,以改善冷EM样本的准备.
  • 同质的粒子分布对于高分辨率的结构研究至关重要.
  • 这种技术为面临类似冷EM挑战的研究人员提供了宝贵的指导.