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相关概念视频

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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Cryo-electron Microscopy01:28

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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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相关实验视频

Updated: Jun 28, 2025

Correlative Microscopy for 3D Structural Analysis of Dynamic Interactions
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Correlative Microscopy for 3D Structural Analysis of Dynamic Interactions

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猎鬼:一种用于冷EM的相位检索衍射断层扫描算法.

Joel Yeo1, Benedikt J Daurer2, Dari Kimanius3

  • 1NUS Graduate School for Integrative Sciences and Engineering Programme, National University of Singapore, 119077 Singapore, Singapore; Department of Physics, National University of Singapore, 117551 Singapore, Singapore; Institute of Materials Research and Engineering (IMRE), Agency for Science, Technology and Research (A*STAR), 2 Fusionopolis Way, Innovis #08-03, 138634 Singapore, Singapore.

Ultramicroscopy
|April 20, 2024
PubMed
概括
此摘要是机器生成的。

低温电子显微镜 (cryo-EM) 重建可以遭受被称为鬼魂的文物,甚至在细颗粒中. 一个新的Ghostbuster算法通过检索丢失的阶段来消除这些鬼魂,改善图像质量而不改变数据收集.

关键词:
低温电子显微镜的低温电子显微镜.微分断层断层扫描 (Diffraction tomography) 是一种通过微分断层扫描进行的扫描.埃瓦尔德球的曲率校正阶段检索恢复阶段检索单个粒子重建的重建

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相关实验视频

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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.
  • 电子显微镜电子显微镜

背景情况:

  • 低温电子显微镜 (cryo-EM) 是一种强大的技术,用于确定生物分子的3D结构.
  • 现有的重建方法通常依赖于近似,例如投影近似,可以引入文物,特别是对于更厚的标本.
  • 即使在以前被认为是薄的样本中,也观察到被称为"幽灵"的重建文物.

研究的目的:

  • 在冷EM重建中识别和描述幽灵文物的起源.
  • 开发一种计算方法来消除这些文物并提高图像质量.
  • 与现有的最先进的软件相比,证明拟议方法的有效性.

主要方法:

  • 这项研究将埃瓦尔德球的曲率校正扩展到投影近似之外.
  • 引入了一种新的算法,Ghostbuster,它可以检索电子输出波的丢失相.
  • 该方法采用了粒子内部的第一个Born近似散射来纠正文物.

主要成果:

  • 幽灵文物可以出现在以前被认为是薄的粒子的冷电磁重建中.
  • 猎鬼算法有效地通过检索丢失的相和计算散射来消除这些幽灵工件.
  • 与当前最先进的软件相比,模拟显示重建质量的显著改善.

结论:

  • 幽灵文物是冷EM重建的一个重要问题,甚至影响细颗粒.
  • 猎鬼算法提供了一种有效的解决方案,可以在不修改数据采集的情况下删除这些文物.
  • 这种方法有可能提高冷EM结构研究的分辨率和可靠性.