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Transmission Electron Microscopy01:15

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In 1931, physicist Ernst Ruska—building on the idea that magnetic fields can direct an electron beam just as lenses can direct a beam of light in an optical microscope—developed the first prototype of the electron microscope. This development led to the development of the field of electron microscopy. In the transmission electron microscope (TEM), electrons are produced by a hot tungsten element and accelerated by a potential difference in an electron gun, which gives them up to 400...
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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
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Square beams for optimal tiling in TEM.

Eugene Yd Chua1, Lambertus M Alink1, Mykhailo Kopylov1

  • 1Simons Electron Microscopy Center, New York Structural Biology Center, New York, NY 10027.

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|August 23, 2023
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Summary
This summary is machine-generated.

A new square electron beam for transmission electron microscopes enables perfect tiling for large field-of-view imaging. This innovation improves dose-sensitive cryo-electron microscopy (cryo-EM) imaging with comparable resolution.

Keywords:
TEMTEM tilingcryo-EMsquare beam

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Area of Science:

  • Microscopy and Imaging Technologies
  • Structural Biology
  • Materials Science

Background:

  • High-magnification imaging of large areas in transmission electron microscopy (TEM) necessitates image tiling.
  • Conventional TEMs with round electron beams struggle with imperfect tiling and uneven exposures, particularly problematic for dose-sensitive samples.
  • Existing tiling methods present limitations for achieving uniform illumination and high-resolution data acquisition.

Approach:

  • Introduction of a novel square electron beam technology designed for easy retrofitting into existing TEM systems.
  • Demonstration of the square beam's capability for near-perfect tiling across large fields-of-view.
  • Application of the square beam in cryo-electron microscopy (cryo-EM) to assess its performance.

Key Points:

  • The square electron beam achieves near-perfect tiling, overcoming limitations of round beam profiles.
  • This technology facilitates uniform exposure, crucial for preserving sample integrity in dose-sensitive imaging.
  • Cryo-EM imaging using the square beam yields resolutions comparable to conventional methods.

Conclusions:

  • The retrofittable square electron beam offers a significant advancement for large-field imaging in TEM.
  • It provides a practical solution for uniform illumination and improved data quality in cryo-EM.
  • This innovation enhances the utility of TEM for high-resolution structural and materials analysis.