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Related Concept Videos

Preparation of Samples for Electron Microscopy01:20

Preparation of Samples for Electron Microscopy

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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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Overview of Electron Microscopy01:25

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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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The cytoskeletal architecture can be studied using different microscopic and biochemical techniques. Electron microscopy was instrumental in discovering the cytoskeletal architecture around the 1960s, which allowed obtaining structural information at a high-resolution level. However, the sample preparation procedure often limits this ability in biological samples. Several protocols have been developed over the years to optimize sample preparation. In one of the protocols known as rotary...
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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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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
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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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Fiber analysis vignettes: Electron microscopy to the rescue!

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Understanding asbestos-related diseases requires examining exposure doses. Fiber analysis using electron microscopy has revealed unexpected findings, highlighting differences in fiber potency and improving our understanding of disease-exposure relationships.

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Area of Science:

  • Environmental Health Sciences
  • Toxicology
  • Occupational Medicine

Background:

  • Asbestos exposure is linked to various diseases, with different fiber types exhibiting varying potencies.
  • Epidemiological studies suggest amphiboles are more potent than chrysotile in causing asbestos-related diseases.
  • However, epidemiological findings can sometimes be misleading, necessitating further investigation.

Purpose of the Study:

  • To summarize key instances where fiber analysis using electron microscopy yielded unexpected results.
  • To elucidate the impact of these findings on understanding asbestos disease-exposure relationships.
  • To highlight the importance of accurate fiber identification in occupational health.

Main Methods:

  • Review of historical case studies and scientific literature.
  • Analysis of fiber characteristics using electron microscopy techniques.
  • Correlation of fiber analysis data with epidemiological outcomes.

Main Results:

  • Electron microscopy has uncovered discrepancies between expected and actual fiber compositions in exposure samples.
  • Specific fiber types, previously underestimated, were found to be significant contributors to disease.
  • Unexpected findings from fiber analysis have refined our understanding of asbestos pathogenicity.

Conclusions:

  • Fiber analysis is crucial for accurately assessing asbestos exposure and disease risk.
  • Electron microscopy provides critical data that can correct or refine epidemiological interpretations.
  • Understanding the specific roles of different asbestos fiber types is essential for effective prevention and management strategies.