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相关概念视频

Cryo-electron Microscopy01:28

Cryo-electron Microscopy

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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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Electron Microscope Tomography and Single-particle Reconstruction01:07

Electron Microscope Tomography and Single-particle Reconstruction

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Transmission electron microscopy (TEM) can be used to determine the 3D structure of biological samples with the help of techniques such as electron microscope tomography and single-particle reconstruction. While single-particle reconstruction can examine macromolecules and macromolecular complexes in vitro conditions only, tomography permits the study of cell components or small cells in vivo.
Electron Tomography
Electron tomography can be performed either in TEM or STEM (scanning transmission...
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相关实验视频

Updated: Jan 15, 2026

Sample Preparation by 3D-Correlative Focused Ion Beam Milling for High-Resolution Cryo-Electron Tomography
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单分子3D纳米镜应用于冷固定样品.

Kanta Naruse1,2, Tsuyoshi Matsuda1, Yuta Mizouchi1

  • 1Department of Physics, Institute of Science, Tokyo, Meguro, Tokyo 152-3550, Japan.

The journal of physical chemistry. B
|October 9, 2025
PubMed
概括

低温3D纳米技术实现了安格斯特罗姆尺度生物分子结构的保存. 这种新技术使得单个光体的纳米尺度3D定位精度,克服了以前的轴向限制.

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Cryo-Structured Illumination Microscopic Data Collection from Cryogenically Preserved Cells
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Cryo-Structured Illumination Microscopic Data Collection from Cryogenically Preserved Cells

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Correlative Microscopy for 3D Structural Analysis of Dynamic Interactions
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Last Updated: Jan 15, 2026

Sample Preparation by 3D-Correlative Focused Ion Beam Milling for High-Resolution Cryo-Electron Tomography
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科学领域:

  • 生物物理学的生物物理.
  • 结构生物学 结构生物学
  • 低温电子显微镜的使用方法

背景情况:

  • 低温条件在玻璃化冰中保存了安格斯特罗姆尺度的生物分子结构.
  • 在冷条件下减少光白可以提高横向定位的准确性.
  • 轴定位精度仍然是一个重大挑战,仅限于几十纳米.

研究的目的:

  • 开发一个冷3D纳米显微镜系统,用于安格斯特罗姆尺度分辨率.
  • 为了实现纳米尺度定位精度在三个维度对于个体光体.
  • 为了克服以前冷显微镜技术中轴定位精度的局限性.

主要方法:

  • 利用多焦平面检测用于接近射击噪声的局部限制.
  • 从闪,双极方向和背景辐射中最小化的错误.
  • 采用双链DNA (dsDNA) 分子与合光体进行验证.

主要成果:

  • 在冷条件下,在纳米范围内证明了3D定位的准确性.
  • 在1.9K的17nmdseDNA分子上测量了光体之间的20±8nm的3D距离.
  • 实现了与射击噪声极限相当的本地化误差,验证了系统的精度.

结论:

  • 低温3D纳米镜成功实现了纳米尺度3D定位精度.
  • 开发的系统克服了冷却显微镜中以前的轴向定位限制.
  • 这种技术有可能用于生物分子的高分辨率结构分析.