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Related Experiment Videos

Modified thiocarbohydrazide procedure for scanning electron microscopy: routine use for normal, pathological, or

L E Malick, R B Wilson

    Stain Technology
    |July 1, 1975
    PubMed
    Summary

    A new thiocarbohydrazide (TCH) method prepares biological tissues for scanning electron microscopy without metal coating. This technique enhances surface detail and allows for subsequent transmission electron microscopy examination.

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    Area of Science:

    • Biological Sciences
    • Microscopy Techniques
    • Materials Science

    Background:

    • Scanning electron microscopy (SEM) typically requires metal coating for biological samples.
    • Metal coating can obscure fine surface details and limit subsequent analyses.
    • Existing methods may not be suitable for all tissue types or pathological samples.

    Purpose of the Study:

    • To develop a reliable metal-free preparation method for soft biological tissues for SEM.
    • To evaluate the applicability of the technique across diverse tissue types and surface morphologies.
    • To assess the compatibility of the method with subsequent transmission electron microscopy (TEM) analysis.

    Main Methods:

    • A modified thiocarbohydrazide (TCH) technique was employed to cross-link osmium layers on biological tissues.

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  • The TCH method was applied to various soft biological tissues, including those with smooth, irregular, or cut surfaces.
  • SEM imaging was performed without the use of evaporated metal coating.

    • Main Results:

    • The TCH technique successfully prepared a wide variety of soft biological tissues for SEM.
    • The method provided excellent visualization of small surface structures and cell junctions.
    • Thin tissues, like alveolar endothelium, showed transparency, enabling visualization of internal structures (capillary lumen cells) while maintaining capillary wall contrast.
    • The absence of metal coating facilitated easy removal of tissue for subsequent TEM examination.

    Conclusions:

    • The modified TCH technique offers a reliable, metal-free SEM preparation method for diverse biological tissues.
    • This approach enhances surface detail, improves applicability to challenging samples, and enables correlative microscopy (SEM-TEM).
    • The technique is particularly advantageous for studying delicate structures and pathological tissues.