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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...
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...

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Related Experiment Video

Updated: Jun 8, 2026

Do's and Don'ts of Cryo-electron Microscopy: A Primer on Sample Preparation and High Quality Data Collection for Macromolecular 3D Reconstruction
09:25

Do's and Don'ts of Cryo-electron Microscopy: A Primer on Sample Preparation and High Quality Data Collection for Macromolecular 3D Reconstruction

Published on: January 9, 2015

Image restoration in cryo-electron microscopy.

Pawel A Penczek1

  • 1Department of Biochemistry and Molecular Biology, The University of Texas, Houston Medical School, Houston, Texas, USA.

Methods in Enzymology
|October 5, 2010
PubMed
Summary
This summary is machine-generated.

Image restoration in molecular electron microscopy (EM) enhances structural maps. Linear methods, particularly Wiener filtration, optimize Fourier amplitudes for clearer visualization and comparison with X-ray crystallography data.

More Related Videos

Single Particle Cryo-Electron Microscopy: From Sample to Structure
11:52

Single Particle Cryo-Electron Microscopy: From Sample to Structure

Published on: May 29, 2021

Related Experiment Videos

Last Updated: Jun 8, 2026

Do's and Don'ts of Cryo-electron Microscopy: A Primer on Sample Preparation and High Quality Data Collection for Macromolecular 3D Reconstruction
09:25

Do's and Don'ts of Cryo-electron Microscopy: A Primer on Sample Preparation and High Quality Data Collection for Macromolecular 3D Reconstruction

Published on: January 9, 2015

Single Particle Cryo-Electron Microscopy: From Sample to Structure
11:52

Single Particle Cryo-Electron Microscopy: From Sample to Structure

Published on: May 29, 2021

Area of Science:

  • Structural Biology
  • Biophysics
  • Image Processing

Background:

  • Molecular electron microscopy (EM) data requires restoration to approximate original object structures.
  • Linear restoration methods are crucial in EM for preserving mass density relationships in structural maps.

Purpose of the Study:

  • To describe image restoration methodologies in structural EM.
  • To focus on the optimal recovery of Fourier amplitudes from EM data acquired at various defocus levels.

Main Methods:

  • Detailed discussion of pseudoinverse restoration methods (mean-square error, chi-square error, constrained based).
  • Exploration of Wiener filtration approaches for amplitude correction and map sharpening.
  • Presentation of a semiheuristic Wiener filter solution for heterogeneous datasets.

Main Results:

  • Wiener filtration enables amplitude correction, making EM maps comparable to X-ray crystallography maps.
  • Methods incorporating non-white noise distributions are discussed within pseudoinverse restoration.
  • The study outlines protocols implemented in common single-particle analysis software.

Conclusions:

  • Linear image restoration, especially Wiener filtration, is vital for high-resolution structural EM.
  • Optimized EM maps facilitate direct comparative interpretation with other structural biology techniques.
  • The described methodologies improve the quality and interpretability of molecular structures derived from EM data.