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Manipulating biological samples for environmental scanning electron microscopy observation.

S S Tai1, X M Tang

  • 1Department of Biophysics and Cell Biology, Shanghai Second Medical University, China.

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|September 6, 2001
PubMed
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Environmental scanning electron microscopy (ESEM) allows detailed observation of untreated biological samples. Optimized conditions revealed surface features without charging, outperforming traditional methods.

Area of Science:

  • Microscopy
  • Materials Science
  • Biology

Background:

  • Traditional electron microscopy requires sample fixation and coating, which can alter natural structures.
  • Environmental Scanning Electron Microscopy (ESEM) offers a method to observe hydrated or volatile samples under less stringent conditions.

Purpose of the Study:

  • To determine optimal environmental conditions for observing untreated biological samples using ESEM.
  • To compare ESEM imaging of untreated samples with conventional high-vacuum microscopy of fixed and coated samples.

Main Methods:

  • Utilizing Environmental Scanning Electron Microscopy (ESEM) to image diverse biological samples.
  • Systematically varying sample temperature and chamber pressure to establish optimal imaging parameters.
  • Comparing high-resolution ESEM images of untreated samples with those obtained from fixed and coated samples under high vacuum.

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Main Results:

  • Optimal ESEM conditions were identified at 4-6°C and 5.2-5.9 Torr, maintaining ~85% relative humidity.
  • Under these conditions, untreated biological samples exhibited fully exposed surface features without charging artifacts.
  • ESEM imaging of untreated samples provided comparable or superior surface detail compared to fixed and coated samples.

Conclusions:

  • ESEM is a valuable technique for visualizing the native surface topography of biological samples.
  • Optimized environmental parameters in ESEM minimize sample alteration and charging, enhancing image quality.
  • This approach provides an alternative to conventional microscopy, preserving sample integrity.