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Updated: May 24, 2026

Rapid Freezing using Sandwich Freezing Device for Good Ultrastructural Preservation of Biological Specimens in Electron Microscopy
Published on: July 19, 2021
Safe high-pressure freezing of infectious micro-organisms
D Vanhecke1, B Zuber, S D Brugger
1Institute of Anatomy, Experimental Morphology, University of Bern, Bern, Switzerland.
High-pressure freezing of infectious biological material is now safer using membrane carriers. This method reduces infection risk while requiring careful handling and adherence to safety regulations.
Area of Science:
- Cryo-electron microscopy
- Infectious disease research
- Biological sample preparation
Background:
- High-pressure freezing (HPF) is crucial for preserving biological structures.
- Handling infectious materials requires stringent safety protocols to prevent dissemination.
- Existing HPF methods may pose risks when applied to highly infectious samples.
Purpose of the Study:
- To present a safe and effective method for high-pressure freezing of infectious biological material.
- To reduce the risk of infectious material dissemination during sample preparation.
- To adapt HPF techniques for enhanced biosafety in research settings.
Main Methods:
- Utilizing specialized membrane carriers for high-pressure freezing.
- Implementing careful manipulation techniques during the freezing process.
- Adhering to established safety regulations for handling infectious agents.
Main Results:
- Successful high-pressure freezing of infectious biological samples was achieved.
- The membrane carrier method significantly reduces the risk of infectious material spread.
- The procedure is straightforward but necessitates meticulous technique.
Conclusions:
- Membrane carriers offer a safer approach to high-pressure freezing of infectious materials.
- This technique enhances biosafety without compromising sample integrity.
- Further research may explore broader applications in infectious agent research.
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