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Electron spectroscopic imaging.

G T Simon1

  • 1Electron Microscopy Facility, Faculty of Health Sciences, McMaster University, Hamilton, Ontario, Canada.

Ultrastructural Pathology
|January 1, 1987
PubMed
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Electron spectroscopic imaging (ESI) offers high-resolution elemental analysis in microscopy. This sensitive technique precisely localizes elements like calcium within cellular structures, aiding disease research.

Area of Science:

  • Materials Science
  • Biophysics
  • Analytical Chemistry

Background:

  • Electron spectroscopic imaging (ESI) is a highly sensitive electron microscopic analytical technique.
  • It achieves 0.5 nm spatial resolution and mass resolution under 50 atoms.
  • ESI utilizes filtered, inelastically scattered, transmitted electrons to generate spectroscopic images.

Purpose of the Study:

  • To introduce and detail the capabilities of Electron Spectroscopic Imaging (ESI).
  • To demonstrate ESI's application in analyzing elemental distribution in biological specimens.
  • To highlight ESI's potential for quantitative elemental analysis in pathogenesis research.

Main Methods:

  • Specimens are prepared to be under 30 nm thickness to prevent electron scattering.

Related Experiment Videos

  • For diffusable elements, techniques like quick-freezing and plastic embedding are employed.
  • Calcium was analyzed in rat kidney mitochondria under normal and ischemic conditions.

    • Main Results:

    • ESI demonstrated high sensitivity and spatial resolution, localizing calcium within mitochondria.
    • The preparation techniques ensured that calcium was not extracted during analysis.
    • The study showcases ESI's ability to analyze elemental distribution in biological tissues.

    Conclusions:

    • ESI is a powerful tool for elemental analysis in biological samples at high resolution.
    • It is crucial for studying conditions involving altered elemental distribution and concentration.
    • Further development aims to make ESI entirely quantitative for broader applications.