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Related Concept Videos

Cryo-electron Microscopy01:28

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Conventional electron microscopy (EM) involves dehydration, fixation, and staining of biological samples, which distorts the native state of biological molecules and results in several artifacts. Also, the high-energy electron beam damages the sample and makes it difficult to obtain high-resolution images. These issues can be addressed using cryo-EM, which uses frozen samples and gentler electron beams. The technique was developed by Jacques Dubochet, Joachim Frank, and Richard Henderson, for...
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Related Experiment Video

Updated: Nov 23, 2025

Rapid Freezing using Sandwich Freezing Device for Good Ultrastructural Preservation of Biological Specimens in Electron Microscopy
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Aldehyde-stabilized cryopreservation.

Robert L McIntyre1, Gregory M Fahy1

  • 121st Century Medicine, 14960 Hilton Drive, Fontana, CA 92336, USA.

Cryobiology
|September 27, 2015
PubMed
Summary
This summary is machine-generated.

Aldehyde-stabilized cryopreservation (ASC) is a novel brain banking technique offering long-term, ice-free storage with high anatomical resolution. This method preserves neural ultrastructure, enabling advanced neuroanatomical and connectomics research.

Keywords:
Brain bankingConnectomicsCryopreservationCryoprotective agentsElectron microscopyFixationLong term storageNeuroanatomyPerfusionPigRabbitUltrastructureVitrification

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Area of Science:

  • Cryobiology
  • Neurobiology
  • Neuroscience

Background:

  • Advanced cryopreservation techniques are crucial for preserving biological samples.
  • Neurobiological research, particularly connectomics, requires high-resolution brain tissue preservation.
  • Existing brain banking methods have limitations in long-term storage and ultrastructural integrity.

Purpose of the Study:

  • To introduce and validate a new brain banking technique: aldehyde-stabilized cryopreservation (ASC).
  • To demonstrate ASC's utility for neuroanatomical research, including connectomics.
  • To showcase ASC's ability to combine stable, ice-free storage with excellent anatomical resolution.

Main Methods:

  • Perfusing rabbit and pig brains with glutaraldehyde-based fixative.
  • Gradually perfusing increasing concentrations of ethylene glycol for cryoprotection.
  • Vitrifying brains at -135°C for long-term storage and subsequent rewarming and cryoprotectant removal.

Main Results:

  • Demonstrated excellent preservation of neural ultrastructure across multiple brain regions in both species.
  • Confirmed easily traceable neural processes and crisp synapses using electron microscopy and FIB-SEM.
  • Showcased uniform preservation quality throughout the entire brain volume.

Conclusions:

  • Aldehyde-stabilized cryopreservation (ASC) offers significant advantages for brain banking.
  • ASC enables scalable, long-term, ice-free storage of brain tissue with preserved ultrastructure.
  • The technique yields perfusable, aldehyde-preserved brains suitable for diverse neurobiological assays.