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Electron Microscope Tomography and Single-particle Reconstruction01:07

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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.
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A scanning electron microscope (SEM) is used to study the surface features of a sample by using an electron beam that scans the sample surface in a two-dimensional manner. Typically, areas between ~1 centimeter to 5 micrometers in width can be imaged. SEM can be used to image bacteria, viruses, tissues as well as larger samples like insects. Conventional SEM gives a magnification ranging from 20X to 30,000X and spatial resolution of 50 to 100 nanometers.
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The wavelengths of visible light ultimately limit the maximum theoretical resolution of images created by light microscopes. Most light microscopes can only magnify 1000X, and a few can magnify up to 1500X. Electrons, like electromagnetic radiation, can behave like waves, but with wavelengths of 0.005 nm, they produce significantly greater resolution up to 0.05 nm as compared to 500 nm for visible light. An electron microscope (EM) can create a sharp image that is magnified up to 2,000,000X.
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Updated: Sep 11, 2025

Cryo-Electron Tomography Remote Data Collection and Subtomogram Averaging
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Cryo-Electron Tomography Remote Data Collection and Subtomogram Averaging

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Fast automatic multiscale electron tomography for sensitive materials under environmental conditions.

Louis-Marie Lebas1, Karine Masenelli-Varlot1, Victor Trillaud1

  • 1MATEIS, UMR5510, Univ Lyon, INSA Lyon, UCBL, CNRS, Villeurbanne Cedex, 69621, France.

Communications Engineering
|August 12, 2025
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Summary
This summary is machine-generated.

A new protocol allows nanoscale imaging of beam-sensitive samples under environmental conditions. This method offers precise control, automated data acquisition, and easier sample preparation for materials science and biology applications.

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Area of Science:

  • Materials Science
  • Biology
  • Electron Microscopy

Background:

  • Increasing demand for nanoscale characterization of beam-sensitive samples in environmental conditions.
  • Limitations of existing techniques for in-situ, hydrated sample analysis.

Purpose of the Study:

  • To develop a protocol for precise, automated 3D nanoscale imaging of samples under environmental conditions.
  • To enable controlled electron dose and multi-modal signal acquisition.

Main Methods:

  • Custom software for precise electron microscope control.
  • Custom sample holder for automated 3D data acquisition from single objects.
  • Environmental scanning electron microscopy (ESEM) and environmental transmission electron microscopy (ETEM) compatibility.

Main Results:

  • Demonstrated effectiveness in investigating Al(OH)3 hydrogel porosity and gold nanoparticle distribution.
  • Successfully characterized unfixed, hydrated magnetotactic bacteria in their native 3D state.
  • Achieved controlled electron dose and multi-modal electron signals.

Conclusions:

  • This methodological development is a milestone for studying samples at any humidity level.
  • Offers easier sample preparation than cryo-transmission electron microscopy (cryo-TEM) with comparable or lower dose levels.
  • Facilitates high spatial resolution imaging of hydrated samples.