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Related Concept Videos

Cryo-electron Microscopy01:28

Cryo-electron Microscopy

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...
Three-Dimensional Microscopy in Microbiology01:28

Three-Dimensional Microscopy in Microbiology

Three-dimensional imaging techniques are essential in cell biology, allowing researchers to visualize intricate cellular structures with high resolution. Two prominent methods, Differential Interference Contrast Microscopy (DIC) and Confocal Scanning Laser Microscopy (CSLM), provide distinct advantages for imaging live and thick specimens, respectively.Differential Interference Contrast MicroscopyDIC microscopy enhances contrast in transparent, unstained samples by converting phase...
Electron Microscope Tomography and Single-particle Reconstruction01:07

Electron Microscope Tomography and Single-particle Reconstruction

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...
Transmission Electron Microscopy01:15

Transmission Electron Microscopy

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 keV in...

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Related Experiment Video

Updated: Jun 8, 2026

Electron Cryotomography of Bacterial Cells
14:23

Electron Cryotomography of Bacterial Cells

Published on: May 6, 2010

Bacterial TEM: new insights from cryo-microscopy.

Martin Pilhofer1, Mark S Ladinsky, Alasdair W McDowall

  • 1Division of Biology, California Institute of Technology, Pasadena, California 91125, USA.

Methods in Cell Biology
|September 28, 2010
PubMed
Summary

Electron microscopy reveals bacterial cell structures. Cryo-electron microscopy offers near-native imaging, overcoming limitations of older methods and providing new biological insights into bacterial ultrastructure.

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Subnanometer-Resolution Structural Determination of Hemagglutinin from Cryo-Electron Tomography of Influenza Viruses

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Related Experiment Videos

Last Updated: Jun 8, 2026

Electron Cryotomography of Bacterial Cells
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Published on: May 6, 2010

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Subnanometer-Resolution Structural Determination of Hemagglutinin from Cryo-Electron Tomography of Influenza Viruses
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Subnanometer-Resolution Structural Determination of Hemagglutinin from Cryo-Electron Tomography of Influenza Viruses

Published on: November 7, 2025

Area of Science:

  • Microbiology
  • Cell Biology
  • Microscopy

Background:

  • Bacteria are crucial model organisms in biology and medicine.
  • Electron microscopy has been instrumental in visualizing bacterial cells.
  • Understanding bacterial ultrastructure is key to advancing biological and medical research.

Purpose of the Study:

  • To review the application of electron microscopy in imaging bacterial cells.
  • To summarize technical details, advantages, and disadvantages of various electron microscopy methods.
  • To highlight major biological insights gained from these imaging techniques.

Main Methods:

  • Review of established electron microscopy techniques, including those involving dehydration and metal stains.
  • Introduction and discussion of cryo-electron microscopy (cryo-EM) for imaging in a frozen-hydrated state.
  • Analysis of methods for identifying structures and localizing proteins in cryo-EM images.

Main Results:

  • Traditional methods (dehydration, stains) reveal ultrastructure but can cause artifacts and miss structures like the cytoskeleton.
  • Cryo-electron microscopy enables near-native imaging, avoiding dehydration and stains.
  • Cryo-EM has led to significant new insights into bacterial ultrastructure and protein localization.

Conclusions:

  • Methodological advancements in electron microscopy have profoundly impacted our understanding of bacterial ultrastructure.
  • Cryo-electron microscopy represents a major leap forward, preserving cellular integrity for more accurate visualization.
  • Future efforts focus on leveraging cryo-EM for detailed structural and proteomic analysis in bacteria.