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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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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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Scanning Electron Microscopy01:07

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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.
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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

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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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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Updated: Feb 11, 2026

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Ups and downs in early electron cryo-microscopy.

Jacques Dubochet1, Erwin Knapek2

  • 1Department of Ecology and Evolution (DEE), University of Lausanne, Lausanne, Switzerland.

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Two scientists reflect on how the pursuit of a major discovery led to exaggerated conclusions early in their careers. They share their insights on overcoming this scientific misjudgment and its impact on their subsequent significant research.

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Area of Science:

  • Scientific integrity
  • Research ethics
  • Career development

Background:

  • Early career scientific judgment can be compromised by the allure of significant findings.
  • Overstated conclusions from initial research can impact scientific credibility.
  • Retrospective analysis is crucial for understanding scientific process errors.

Discussion:

  • The authors recount personal experiences of scientific overstatement.
  • They analyze the psychological and professional pressures contributing to such events.
  • This narrative explores the long-term consequences of compromised scientific integrity.

Key Insights:

  • Recognizing and correcting exaggerated findings is vital for scientific progress.
  • Humility and rigorous self-assessment are essential components of scientific practice.
  • Past errors, when understood, can inform future robust research.

Outlook:

  • Promoting transparency and open discussion about scientific missteps.
  • Developing better mentorship and training in research ethics.
  • Encouraging a culture that values accuracy over premature claims.