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Molecular microscopy: fundamental limitations.

J R Breedlove, G T Trammell

    Science (New York, N.Y.)
    |December 18, 1970
    PubMed
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    High-resolution molecular microscopy is limited by radiation damage. Electron and X-ray microscopes cannot resolve individual atoms in biological molecules, but helium atom or neutron microscopes may offer future possibilities.

    Area of Science:

    • Biophysics
    • Microscopy
    • Molecular Biology

    Background:

    • Achieving atomic resolution in biological microscopy is a long-standing goal.
    • Existing high-resolution imaging techniques like electron and X-ray microscopy face limitations due to radiation damage to delicate biological samples.

    Purpose of the Study:

    • To assess the feasibility of achieving atomic resolution in molecular microscopy.
    • To evaluate the potential of different illumination sources for ultimate biomolecular imaging.

    Main Methods:

    • Theoretical estimation of molecular damage caused by the observation process.
    • Analysis of damage thresholds for electron and X-ray microscopy.
    • Evaluation of alternative illumination sources, including low-energy helium atoms and neutrons.

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    Main Results:

    • Electron and X-ray microscopy are fundamentally limited by molecular damage, precluding atomic resolution of biological molecules.
    • The estimated damage levels exceed the threshold for preserving atomic detail.

    Conclusions:

    • Atomic resolution molecular microscopy using current electron or X-ray technology is not feasible.
    • Future development of microscopes utilizing low-energy helium atoms or neutrons holds promise for achieving ultimate biomolecular imaging capabilities.