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Specimen Behavior in the Electron Beam.

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Electron microscopy samples and vitreous ice are susceptible to radiation damage. Understanding electron scattering, radiation chemistry, and biology explains this sensitivity and beam-induced motion in cryo-EM.

Keywords:
Energy depositedRadiation doseSpecimen chargingSpecimen damageSpecimen motion

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Area of Science:

  • Structural Biology
  • Microscopy Techniques

Background:

  • Cryo-electron microscopy (cryo-EM) requires high resolution, but specimens are vulnerable to electron radiation damage at lower exposures.
  • The vitreous ice embedding samples is also highly sensitive to radiation damage, a factor often underestimated in cryo-EM research.

Purpose of the Study:

  • To review fundamental principles underlying radiation damage in cryo-EM.
  • To explain the sensitivity of both biological specimens and vitreous ice to electron exposure.
  • To investigate the causes of beam-induced motion in cryo-EM.

Main Methods:

  • Review of inelastic electron scattering principles.
  • Discussion of radiation chemistry and radiation biology relevant to cryo-EM.
  • Analysis of factors contributing to beam-induced motion.

Main Results:

  • Electron exposure causes significant damage to cryo-EM specimens and vitreous ice at low levels.
  • Inelastic scattering, radiation chemistry, and biology are key factors in understanding radiation damage.
  • Beam-induced motion, potentially caused by charging, stress relief, and stress generation, occurs at low electron exposures.

Conclusions:

  • A comprehensive understanding of radiation damage mechanisms is crucial for optimizing cryo-EM imaging.
  • Addressing radiation sensitivity of both sample and ice is essential for high-resolution cryo-EM.
  • Further investigation into the causes of beam-induced motion is needed to mitigate its impact on image quality.