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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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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

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.
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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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Super-resolution Fluorescence Microscopy01:37

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Super-resolution fluorescence microscopy (SRFM) provides a better resolution than conventional fluorescence microscopy by reducing the point spread function (PSF). PSF is the light intensity distribution from a point that causes it to appear blurred. Due to PSF, each fluorescing point appears bigger than its actual size, and it is the PSF interference of nearby fluorophores that causes the blurred image. Various approaches to achieving higher resolution through SRFM have recently been...
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Related Experiment Video

Updated: Jan 29, 2026

Author Spotlight: Enhancing CryoEM Sample Preparation Using Graphene Monolayer on Microscopy Grids
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Bioactive Functionalized Monolayer Graphene for High-Resolution Cryo-Electron Microscopy.

Nan Liu, Jincan Zhang, Yanan Chen

  • 1Collaborative Innovation Center of Quantum Matter , Beijing 100871 , China.

Journal of the American Chemical Society
|February 7, 2019
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Summary
This summary is machine-generated.

New functionalized graphene membrane (FGM) grids improve cryo-electron microscopy (cryo-EM) specimen preparation. These grids specifically bind histidine-tagged proteins, reducing denaturation and enabling high-resolution structural determination.

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Area of Science:

  • Structural Biology
  • Biophysics
  • Materials Science

Background:

  • Single-particle cryo-electron microscopy (cryo-EM) is crucial for molecular-level biological insights.
  • Specimen preparation, particularly vitrified ice embedding, remains a bottleneck in cryo-EM.
  • Conventional methods lead to protein denaturation and orientation bias at the air-water interface.

Purpose of the Study:

  • To develop novel cryo-EM grids for improved specimen preparation.
  • To overcome limitations of traditional cryo-EM sample mounting techniques.
  • To enhance the reproducibility and resolution of cryo-EM structural studies.

Main Methods:

  • Design and fabrication of bioactive-ligand functionalized single-crystalline monolayer graphene membranes (FGM) as cryo-EM grids.
  • Utilizing FGM grids with specific binding affinity for histidine (His)-tagged proteins.
  • Application of FGM grids in cryo-EM for imaging and structural reconstruction of protein complexes.

Main Results:

  • FGM grids demonstrate specific binding to His-tagged proteins and complexes.
  • The grids provide low imaging background and selectively anchor 20S proteasomes.
  • Near-atomic-resolution 3D reconstruction of the 20S proteasome was achieved using FGM grids.

Conclusions:

  • Functionalized graphene membrane grids offer a robust solution for cryo-EM specimen preparation.
  • FGM grids enhance reproducibility and reduce denaturation, improving structural determination efficiency.
  • This approach has the potential to significantly advance high-resolution cryo-EM structural biology.