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Related Experiment Videos

Postmortem alterations of bacterial localization

C P Davis

    Scanning Electron Microscopy
    |January 1, 1980
    PubMed
    Summary
    This summary is machine-generated.

    Autopsy tissues can reveal host-microbial interactions, but bacterial locations shift postmortem. Keratinized stomach tissues are most reliable for studying normal gut flora in human autopsy samples.

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    Area of Science:

    • Microbiology
    • Gastroenterology
    • Microscopy

    Background:

    • Electron microscopy of mammalian gastrointestinal tracts offers insights into host-microbial interactions.
    • Studying human host-microbial interactions is challenging due to difficulties in obtaining viable tissue samples.

    Purpose of the Study:

    • To assess the feasibility of using autopsy-obtained gastrointestinal tissues for studying host-microbial interactions.
    • To simulate postmortem conditions on gastrointestinal tissues using a rat model.

    Main Methods:

    • A rat model was used to simulate postmortem changes in gastrointestinal tissues.
    • Tissues (stomach, ileum, cecum) were collected at intervals up to 24 hours postmortem.
    • Samples underwent fixation, dehydration, critical point drying, and gold-palladium coating for light and scanning electron microscopy.

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    Main Results:

    • Bacterial localization in keratinized murine stomachs remained stable for 24 hours postmortem.
    • Significant bacterial dislocation occurred in the ileum and colon, with the ileum showing the most disruption.
    • Invading bacteria altered colonic tissues, though some areas maintained a normal host-flora relationship.

    Conclusions:

    • Slow cooling rates of gastrointestinal tracts contribute to postmortem bacterial alterations.
    • Keratinized tissues, like the stomach, are recommended for studying normal microbial locations in human autopsy samples.