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Related Concept Videos

Cryo-electron Microscopy01:28

Cryo-electron Microscopy

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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Related Experiment Video

Updated: May 15, 2026

Biological Samples Preparation for Speciation at Cryogenic Temperature using High-Resolution X-Ray Absorption Spectroscopy
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Biological Samples Preparation for Speciation at Cryogenic Temperature using High-Resolution X-Ray Absorption Spectroscopy

Published on: May 27, 2022

Breaking the radiation damage limit with Cryo-SAXS.

Steve P Meisburger1, Matthew Warkentin, Huimin Chen

  • 1School of Applied and Engineering Physics, Cornell University, Ithaca, New York, USA.

Biophysical Journal
|January 22, 2013
PubMed
Summary

Cryo-cooling significantly enhances radiation resistance in small-angle X-ray scattering (SAXS), enabling macromolecular structure determination with minimal sample volumes. This breakthrough allows analysis of previously intractable, radiation-sensitive biomolecules.

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Structural Studies of Macromolecules in Solution using Small Angle X-Ray Scattering
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Last Updated: May 15, 2026

Biological Samples Preparation for Speciation at Cryogenic Temperature using High-Resolution X-Ray Absorption Spectroscopy
06:00

Biological Samples Preparation for Speciation at Cryogenic Temperature using High-Resolution X-Ray Absorption Spectroscopy

Published on: May 27, 2022

Cryogenic Sample Loading into a Magic Angle Spinning Nuclear Magnetic Resonance Spectrometer that Preserves Cellular Viability
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Structural Studies of Macromolecules in Solution using Small Angle X-Ray Scattering
07:19

Structural Studies of Macromolecules in Solution using Small Angle X-Ray Scattering

Published on: November 5, 2018

Area of Science:

  • Structural biology
  • Biophysics
  • Biochemistry

Background:

  • Small-angle X-ray scattering (SAXS) is crucial for low-resolution macromolecular structure determination in solution.
  • Current SAXS methods require microgram quantities of sample (10-20 μL at 1 mg/mL) due to radiation damage limitations.
  • Radiation sensitivity restricts SAXS applications for certain proteins and nucleic acids.

Purpose of the Study:

  • To investigate the impact of cryo-cooling on radiation damage in SAXS experiments.
  • To determine if cryo-cooling enables structure determination with significantly reduced sample volumes.
  • To expand the scope of SAXS to include radiation-sensitive and difficult-to-express biomolecules.

Main Methods:

  • Samples of proteins and nucleic acids were cryocooled to 100 K.
  • SAXS experiments were performed on cryocooled samples.
  • Radiation tolerance of cryocooled samples was compared to room temperature samples.
  • Particle envelope reconstructions were generated from cryo-SAXS data.

Main Results:

  • Cryocooled samples withstood radiation doses at least two orders of magnitude higher than room temperature samples.
  • Accurate particle envelope reconstructions were achieved using only 15 nL of sample volume.
  • This represents a 1000-fold reduction in required sample volume compared to current practices.

Conclusions:

  • Cryo-cooling dramatically increases the radiation tolerance of biological samples in SAXS.
  • Cryo-SAXS enables structure determination using ultra-small sample volumes (nanoliters).
  • This technique opens new avenues for studying radiation-sensitive biomolecules, including metalloenzymes and light-activated proteins.