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Phase Contrast and Differential Interference Contrast Microscopy01:26

Phase Contrast and Differential Interference Contrast Microscopy

Phase-Contrast Microscopes
In-phase-contrast microscopes, interference between light directly passing through a cell and light refracted by cellular components is used to create high-contrast, high-resolution images without staining. It is the oldest and simplest type of microscope that creates an image by altering the wavelengths of light rays passing through the specimen. Altered wavelength paths are created using an annular stop in the condenser. The annular stop produces a hollow cone of...

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Using Tomoauto: A Protocol for High-throughput Automated Cryo-electron Tomography
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在自动化4D STEM冷图学中优化对比度

Shahar Seifer1, Peter Kirchweger1, Karlina Maria Edel1

  • 1Department of Chemical and Biological Physics, Weizmann Institute of Science, 234 Herzl St, Rehovot 7610001, Israel.

Microscopy and microanalysis : the official journal of Microscopy Society of America, Microbeam Analysis Society, Microscopical Society of Canada
|June 17, 2024
PubMed
概括

这项研究引入了一个新的工作流程,用于四维扫描传输电子显微镜 (4D STEM) 在低温显微镜. 这种方法提高了剂量效率,并改善了微妙的生物结构的可视化,例如T4菌中的DNA.

关键词:
在4D STEM中,在CSTETET的基础上.在T4菌体.细菌菌体是一种菌体.低温电磁波冷却器 (Cryo-EM) 是一个非常好的方法.这是一个冷-STEM.不同相位对比差异的相位对比差异.扫描断层扫描 (tomography) 是一个非常重要的技术.

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科学领域:

  • 电子显微镜电子显微镜
  • 生物物理学的生物物理.
  • 材料科学 材料科学 材料科学

背景情况:

  • 四维扫描传输电子显微镜 (4D STEM) 是一种新的技术.
  • 其高剂量效率使其适用于冷显微镜和辐射敏感材料.
  • 传统的方法可能难以可视化细微,不规则的生物特征.

研究的目的:

  • 为获取4D STEM断层扫描倾斜系列提供工作流.
  • 为了证明这个工作流程对生命科学标本的应用.
  • 在冷电子显微镜中增强对比度和可视化微妙结构.

主要方法:

  • 采用了细分二极管和超快的像素化探测器来获取数据.
  • 将工作流与SerialEM平台集成,用于自动数据收集.
  • 开发了用于数据转换和生成各种对比模式的脚本 (例如,环状明亮场,分相对比).

主要成果:

  • 成功获得了T4菌体样本的4DSTEM断层学倾斜系列.
  • 证明了对不规则特征的可视化改进,如DNA链和菌体尾部纤维.
  • 主要组件分析和3D解卷增强了轴向对比度.

结论:

  • 提出的4D STEM工作流是有效的生物样本的冷显微镜.
  • 与传统方法相比,这种方法提供了优越的剂量效率和对比度.
  • 能够对了解生物机制至关重要的细细结构元素进行详细的可视化.