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Related Experiment Videos

Freezing: facts and hypothesis.

J Dubochet1, K Richter, H V Roy

  • 1Laboratoire d'Analyse Ultrastructurale (LAU), Bâtiment de Biologie, Universite de Lausanne, Switzerland.

Scanning Microscopy. Supplement
|January 1, 1991
PubMed
Summary
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Large hexagonal ice crystals in frozen biological samples can cause significant damage. However, rapid cooling forms small cubic ice crystals, minimizing structural harm by preventing solute segregation during rewarming.

Area of Science:

  • Cryobiology
  • Materials Science

Background:

  • Ice crystal formation in biological tissues during freezing can lead to structural damage.
  • Different ice crystal polymorphs (hexagonal vs. cubic) exhibit varying sizes and associated damage.
  • Solute segregation during ice formation is a key factor in cryoinjury.

Purpose of the Study:

  • To explain the observed discrepancy in structural damage caused by ice crystals in biological specimens.
  • To propose a hypothesis linking cubic ice crystal formation to reduced damage from hexagonal ice crystals.

Main Methods:

  • Observation of ice crystal morphology (hexagonal and cubic) in frozen biological specimens.
  • Analysis of the relationship between cooling rates, ice crystal type, and resulting structural damage.
  • Hypothetical modeling of ice crystal transformations during rewarming.

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Main Results:

  • Large, branched hexagonal ice crystals are associated with severe structural damage due to solute segregation.
  • Small, cubic ice crystals formed at rapid cooling rates cause minimal damage.
  • A hypothesis is presented where cubic ice crystals transform into hexagonal ice crystals upon rewarming without significant solute displacement.

Conclusions:

  • The transformation of cubic ice into hexagonal ice during rewarming, without solute displacement, explains the reduced damage observed in some freezing scenarios.
  • Controlling cooling rates to favor cubic ice formation may be a strategy to mitigate cryoinjury in biological samples.