Flash-freezing Preservation
Flash-freezing Preservation - Related Videos
28:32
Flash Freezing and Cryosectioning E12.5 Mouse Brain
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Cited by 6 •
2007
Demonstrated in this video are the techniques for flash freezing and sectioning embryonic brain tissue from mouse. Useful tips for using the cryostat are given, including troubleshooting methods that can be used while cutting to ensure that the resultant tissues sections are free of cracks and other distortions.
02:42
Preparation of Cancer Spheroid Blocks by Flash Freezing: A Procedure To Preserve Cancer Spheroids in Frozen Matrix Blocks
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2023
This video demonstrates the preparation of cancer spheroid blocks by flash freezing, a technique in which a tissue sample of interest is frozen to an ultracold temperature, restraining the spheroids inside the matrix.
10:01
Flash-and-Freeze: A Novel Technique to Capture Membrane Dynamics with Electron Microscopy
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Cited by 7 •
2017
We developed a novel technique in electron microscopy, "flash-and-freeze," that enables the visualization of membrane dynamics with ms temporal resolution. This technique combines the optogenetic stimulation of neurons with high-pressure freezing. Here, we demonstrate the procedures and describe the protocols in detail.
09:03
Rapid Freezing using Sandwich Freezing Device for Good Ultrastructural Preservation of Biological Specimens in Electron Microscopy
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Cited by 5 •
2021
Here we show how to use the sandwich freezing device for rapid freezing of biological specimens, including bacteria, yeast, cultured cells, isolated cells, animal and human tissues, and viruses. We also show how to prepare specimens for ultrathin sectioning after rapid freezing.
10:32
Thermal Diffusivity and the Laser Flash Method
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2023
Source: Elise S.D. Buki, Danielle N. Beatty, and Taylor D. Sparks, Department of Materials Science and Engineering, The University of Utah, Salt Lake City, UT The laser flash method (LFA) is a technique used to measure thermal diffusivity, a material specific property. Thermal diffusivity (α) is the ratio of how much heat is conducted relative to how much heat is stored in a material. It is related to thermal conductivity (), how much heat is transferred through a material due to a temperature...
FAQs
Large ice crystals can physically disrupt biological specimens by rupturing cell membranes and distorting tissue architecture. Rapid heat removal reduces the time available for these crystals to develop, helping maintain structural relationships within the sample. This matters when later microscopy or biochemical analysis depends on cellular organization remaining close to its original state.
The cooling rate determines how effectively a specimen’s condition is captured at the moment of preservation. Faster cooling limits structural damage and reduces changes that could obscure transient cellular or molecular states. Consequently, researchers can analyze samples in a condition that more closely reflects the original physiology rather than a state altered during slower temperature reduction.
Cryogenic liquids and precooled surfaces provide the intense cooling conditions needed to remove heat rapidly from biological specimens. Their role is not simply to lower temperature, but to support a rate of cooling that limits damaging ice formation. Selecting one of these cooling approaches helps preservation workflows protect structures and biomolecules needed for downstream analysis.
The method can help retain cellular structures, tissue organization, biomolecules, and physiological states. Preserving these features together is important because biological measurements often depend on both physical architecture and molecular composition. Maintaining them near their original condition supports analyses that seek to connect observed cellular structure with biochemical or physiological information.
A basic workflow must provide the specimen with a sufficiently rapid cooling environment, using a cryogenic liquid or a precooled surface as the cooling source. The chosen approach should minimize the interval during which ice crystals can enlarge and degradation can occur. After cooling, the preserved material can be directed toward the planned biological analysis.
It is especially useful when researchers need tissue, molecular, or physiological information that could change after collection. Applications include tissue preservation, molecular profiling, microscopy, and biochemical assays. The approach is valuable for transient cellular or molecular states because limiting degradation helps measurements represent the specimen more accurately at the time it was obtained.