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Related Concept Videos

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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Preparation of Samples for Electron Microscopy01:20

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To be visualized by an electron microscope, either transmission or scanning, biological samples need to be fixed (stabilized) so the electron beam does not destroy them and dried thoroughly (desiccated/dehydrated) so the vacuum does not affect them. Fixation needs to be done as quickly as possible because the sample properties will start changing as soon as it is removed from its natural environment. For example, in a tissue sample, the oxygen levels begin decreasing, causing an altered...
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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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Immunogold Electron Microscopy01:20

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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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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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Cryo-electron Microscopy Specimen Preparation By Means Of a Focused Ion Beam
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Low-temperature electron microscopy: techniques and protocols.

Roland A Fleck1

  • 1Centre for Ultrastructural Imaging, King's College London, New Hunts House, Guy's Campus, London, SE1 1UL, UK, roland.fleck@kcl.ac.uk.

Methods in Molecular Biology (Clifton, N.J.)
|November 28, 2014
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Summary

Low-temperature electron microscopy, or cryo-electron microscopy, preserves biological specimen structure by rapid cooling. This method minimizes artifacts from chemical fixation, enabling observation of native cellular morphology.

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Area of Science:

  • Biological imaging
  • Electron microscopy techniques
  • Cryogenics in science

Background:

  • Conventional electron microscopy often introduces artifacts through chemical fixation and heavy metal staining.
  • Maintaining native biological specimen morphology and cellular component integrity is crucial for accurate observation.

Purpose of the Study:

  • To define low-temperature electron microscopy as a physical fixation strategy.
  • To highlight cryo-electron microscopy's role in reducing processing artifacts.
  • To emphasize the preservation of native tissue morphology and cellular components.

Main Methods:

  • Application of low-temperature techniques for physical fixation of biological specimens.
  • Utilizing cooling to minimize displacement of cellular components.
  • Employing cryo-electron microscopy for both scanning and transmission electron microscopy.

Main Results:

  • Cryo-electron microscopy significantly reduces artifacts common in room-temperature techniques.
  • Specimens can often be observed directly without chemical fixation or staining.
  • Preservation of native morphology and dimensions of living material is achieved.

Conclusions:

  • Low-temperature electron microscopy is a powerful physical fixation strategy.
  • Cryo-electron microscopy enhances the accuracy of biological specimen observation.
  • This technique offers a pathway to observe cellular structures with minimal alteration.