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Scattered electrons in microscopy and microanalysis

F P Ottensmeyer

    Science (New York, N.Y.)
    |January 29, 1982
    PubMed
    Summary
    This summary is machine-generated.

    Direct electron imaging offers rapid, atomic-resolution structural insights for individual macromolecules, complementing crystallography. New atomic microanalysis techniques enhance light atom detection for diverse biological fields.

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    Area of Science:

    • Electron microscopy
    • Atomic microanalysis
    • Structural biology

    Background:

    • X-ray crystallography provides high-resolution structural data but requires crystallized samples.
    • Individual macromolecules often cannot be crystallized, limiting structural analysis.
    • Direct imaging of biological specimens using electrons offers an alternative approach.

    Purpose of the Study:

    • To present a novel method for direct imaging of biological specimens using scattered electrons.
    • To introduce a new atomic microanalysis technique based on electron energy spectrum analysis.
    • To highlight the potential applications of these techniques in various biological disciplines.

    Main Methods:

    • Direct imaging of biological specimens using scattered electrons.

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  • Analysis of the energy spectrum of scattered electrons.
  • Imaging using characteristic energy bands within the electron energy spectrum.

    • Main Results:

    • Achieved atomic and near-atomic spatial resolutions (0.3–0.5 nanometer) for biological specimens.
    • Developed an atomic microanalysis technique with 0.5 nanometer spatial resolution.
    • Demonstrated a minimum detection sensitivity of approximately 50 atoms of phosphorus, particularly effective for light atom analysis.

    Conclusions:

    • Direct electron imaging provides rapid structural information on individual, uncrystallized macromolecules.
    • Electron energy spectrum analysis enables powerful atomic microanalysis with high spatial resolution.
    • These techniques hold significant promise for applications in molecular biology, cell biology, histology, pathology, and botany.