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Freeze-substitution techniques for preparing nematodes for scanning electron microscopy.

D A Wharton1

  • 1Department of Zoology, University of Otago, Dunedin, New Zealand.

Journal of Microscopy
|December 1, 1991
PubMed
Summary

Freeze substitution with methanol effectively preserves nematodes for scanning electron microscopy. Optimal preservation requires brief substitution times and, for some species, fixatives like OsO4/glutaraldehyde.

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Area of Science:

  • Zoology
  • Microscopy
  • Electron Microscopy

Background:

  • Scanning electron microscopy (SEM) requires well-preserved biological specimens.
  • Freeze substitution is a method for preserving biological samples for SEM.

Purpose of the Study:

  • To investigate the optimal conditions for preserving nematodes using freeze substitution with methanol for SEM.
  • To evaluate the effects of substitution time, temperature, and fixatives on nematode preservation.

Main Methods:

  • Three nematode species were prepared using freeze substitution with methanol.
  • Specimens were subsequently critical point dried for SEM observation.
  • Variations in substitution time, temperature (253 K vs. 193 K), and the use of fixatives (OsO4/glutaraldehyde) were tested.

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Main Results:

  • Hammerschmidtiella diesingi and Trichostrongylus colubriformis were well-preserved with methanol at 253 K.
  • Shorter substitution times improved preservation, suggesting material extraction with prolonged exposure.
  • Panagrolaimus davidi required fixatives (1% OsO4/3% glutaraldehyde in methanol) for successful preservation.
  • Cold chemical fixation retained natural posture but yielded poor preservation; hot fixatives improved preservation but altered posture.

Conclusions:

  • Freeze substitution in methanol is suitable for nematodes with robust cuticles.
  • Fixatives are recommended for more delicate specimens or improved preservation.
  • Optimizing substitution time and considering fixative use are crucial for successful SEM preparation of nematodes.