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Related Experiment Videos

Surface defects on thin cryosections.

P M Frederik, W M Busing, A Persson

    Scanning Electron Microscopy
    |January 1, 1984
    PubMed
    Summary
    This summary is machine-generated.

    Surface defects in cryosections are caused by shear forces during sectioning, similar to metal cutting. Optimizing sectioning speed and temperature can minimize these distortions for clearer electron microscopy.

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    Area of Science:

    • Electron microscopy
    • Materials science
    • Biophysics

    Background:

    • Surface defects commonly impair electron microscopic observation of thin cryosections.
    • Understanding these defects is crucial for accurate structural analysis of biological samples.

    Purpose of the Study:

    • To investigate the causes of surface defects in cryosections.
    • To correlate cryosection structure with the block-face structure.
    • To identify the mechanisms behind periodic deformations.

    Main Methods:

    • Correlating structures of cryosections (CTEM) with block-face (SEM) from frozen biological material.
    • Dry sectioning of hard plastic for comparison.
    • Analyzing defects at various sectioning temperatures and speeds.

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    Main Results:

    • Both cryosections and block-faces exhibit steps larger than 0.5 micron.
    • Thin cryosections below 143 K are smooth, with defects mainly from knife imperfections.
    • A periodical distortion (<120 nm) related to sectioning speed was observed in biological cryosections.
    • These defects resemble those in metal cutting, suggesting shear forces are the primary cause.

    Conclusions:

    • Shear forces are the main cause of periodic deformations in cryosections, analogous to metal cutting.
    • A 'dead zone' around the knife edge may lead to material collection and shedding.
    • Minimizing shear forces through optimized sectioning conditions is key to improving cryosection quality.