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Related Concept Videos

X-ray Crystallography02:18

X-ray Crystallography

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The size of the unit cell and the arrangement of atoms in a crystal may be determined from measurements of the diffraction of X-rays by the crystal, termed X-ray crystallography.
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Overview of Electron Microscopy01:25

Overview of Electron Microscopy

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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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Scanning Electron Microscopy01:07

Scanning Electron Microscopy

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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.
Fundamental Principles
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Transmission Electron Microscopy01:15

Transmission Electron Microscopy

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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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Immunogold Electron Microscopy01:20

Immunogold Electron Microscopy

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Immunoelectron microscopy utilizes immunogold labeling of endogenous proteins with specific antibodies to detect and localize these proteins in cells and tissues. The procedure provides insights into the distribution and quantification of protein under different stimulation conditions offering clues about their functions. Conjugating highly electron-dense gold particles with primary or secondary antibodies allow antigen detection on and within cells, with high resolution and specificity.
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Cryo-electron Microscopy01:28

Cryo-electron Microscopy

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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...
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Updated: Feb 7, 2026

An All-in-one Sample Holder for Macromolecular X-ray Crystallography with Minimal Background Scattering
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An All-in-one Sample Holder for Macromolecular X-ray Crystallography with Minimal Background Scattering

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Combining X-ray crystallography and electron microscopy.

Michael G Rossmann1, Marc C Morais, Petr G Leiman

  • 1Department of Biological Sciences, Purdue University, West Lafayette, Indiana 47907-2054, USA. mgr@indiana.bio.purdue.edu

Structure (London, England : 1993)
|March 16, 2005
PubMed
Summary
This summary is machine-generated.

Cryo-electron microscopy and crystallography integration advances structural biology. This powerful combination enables studying large, uncrystallizable structures and dynamic biological processes with enhanced accuracy.

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Area of Science:

  • Structural Biology
  • Biophysics
  • Biochemistry

Background:

  • Cryo-electron microscopy (cryo-EM) and X-ray crystallography are key techniques for determining molecular structures.
  • Integrating these methods offers synergistic advantages for studying complex biological systems.

Purpose of the Study:

  • To explore the benefits of combining cryo-electron microscopy with crystallography.
  • To highlight applications in studying large, uncrystallizable, and dynamic biological assemblies.
  • To discuss factors influencing cryo-EM map quality and structural fitting accuracy.

Main Methods:

  • Utilizing cryo-electron microscopy for low-resolution analysis of large biological assemblies.
  • Employing crystallography for high-resolution determination of structural fragments.
  • Integrating data from both techniques for comprehensive structural insights.

Main Results:

  • The combined approach expands the scope of structural biology, enabling the study of previously intractable systems.
  • This technique facilitates the investigation of dynamic biological processes.
  • Visual selection of particles in cryo-EM aids in sample purification.

Conclusions:

  • The integration of cryo-EM and crystallography represents a significant advancement in structural biology.
  • This hybrid approach offers unique advantages for characterizing complex molecular architectures and functions.
  • Understanding the factors affecting map quality and fitting is crucial for maximizing the accuracy of structural models.