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Structural changes in samples cryofixed by contact with a cold metal block

P M Bennett1

  • 1The Randall Institute, King's College London, UK.

Journal of Microscopy
|January 29, 1999
PubMed
Summary
This summary is machine-generated.

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Cryofixation rapidly freezes specimens, but distortion can occur. This study reveals that freezing completes in under 1 millisecond, though structural damage is evident at the edges of cryofixed muscle fibers.

Area of Science:

  • Cryo-electron microscopy
  • Structural biology
  • Biophysics

Background:

  • Cryofixation is crucial for preserving biological specimens.
  • Rapid freezing aims to minimize structural distortion.
  • Discrepancies exist between theoretical and experimental freezing rates.

Purpose of the Study:

  • Investigate distortion in cryofixed, freeze-substituted striated muscle fibers.
  • Determine the time scale of freezing during cryofixation.
  • Contribute to the debate on cryofixation freezing rates.

Main Methods:

  • Cryofixation of muscle fibers using a Gatan Cryosnapper and metal-mirror apparatus.
  • Analysis of transverse sections for lattice deviations from hexagonal packing.
  • Measurement of jaw closure speed for the Cryosnapper.

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Main Results:

  • Freezing of well-preserved areas occurs in less than 1 millisecond.
  • Muscle fibers exhibit compression, detectable by lattice deviations.
  • Structural damage and lattice distortion are observed at the edges of cryofixed specimens.

Conclusions:

  • Cryofixation can achieve freezing times under 1 ms.
  • Despite rapid freezing, structural damage occurs at specimen edges.
  • Further optimization of cryofixation techniques is needed to minimize artifacts.