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Cryo-transfer revised.

P M Frederik, W M Busing

    Journal of Microscopy
    |November 1, 1986
    PubMed
    Summary
    This summary is machine-generated.

    Protecting frozen specimens during cryo-transfer is crucial. Shielding with solidified coolant offers a fail-safe method to prevent damaging water vapor deposition, preserving specimen integrity.

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    Area of Science:

    • Cryo-electron microscopy
    • Materials science

    Background:

    • Water vapor deposition poses a significant challenge during the cryo-transfer and cryo-observation of frozen biological specimens.
    • Maintaining specimen integrity at cryogenic temperatures is essential for high-resolution imaging.

    Purpose of the Study:

    • To evaluate existing shielding methods and propose a novel approach using solidified coolants to prevent water vapor deposition.
    • To ensure the preservation of specimen structure during cryo-transfer and observation.

    Main Methods:

    • Evaluation of sliding shields for specimen protection during transfer.
    • Proposal and analysis of using solidified coolants (ethane, Freon 22) as protective layers.
    • Assessment of coolant evaporation in high vacuum and its effect on deposited water films and specimen temperature.

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    Main Results:

    • Sliding shields were confirmed as a fail-safe method for specimen protection.
    • Solidified coolant layers effectively prevent water vapor deposition.
    • Evaporation of the coolant in high vacuum removes deposited water films without causing specimen devitrification.

    Conclusions:

    • Shielding frozen specimens with solidified coolants is a viable and effective strategy to mitigate water vapor deposition during cryo-transfer and observation.
    • This method ensures specimen integrity by preventing ice crystal growth and maintaining low temperatures.