Shock Freezing
Shock Freezing - Related Videos
02:44
Vagus Nerve Stimulation in a Rat Model to Reduce Freezing Behavior
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2025
Source: Childs, J. E., et al. Vagus Nerve Stimulation as a Tool to Induce Plasticity in Pathways Relevant for Extinction Learning. J. Vis. Exp. (2015)This video demonstrates the method of vagus nerve stimulation (VNS) in a rat model to reduce freezing behavior. Fear-conditioned rats receive VNS during sound re-exposure, leading to reduced freezing and revealing its therapeutic potential.
09:48
Drosophila Adult Olfactory Shock Learning
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Cited by 36 •
2014
The method to measure adult Drosophila associative memory is described. The assay is based on the ability of the fly to associate an odor presented with a negative reinforcer (electric shock) and then recall this information at a later time, allowing memory to be measured.
11:01
Bacterial Transformation: The Heat Shock Method
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2023
Transformation is the process that occurs when a cell ingests foreign DNA from its surroundings. Transformation can occur in nature in certain types of bacteria. In molecular biology, transformation is artificially reproduced in the lab via the creation of pores in bacterial cell membranes. Bacterial cells that are able to take up DNA from the environment are called competent cells. In the laboratory, bacterial cells can be made competent and DNA subsequently introduced by a procedure called...
11:17
Fundamental Technical Elements of Freeze-fracture/Freeze-etch in Biological Electron Microscopy
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Cited by 6 •
2014
Basic techniques and refinements of freeze-fracture processing of biological specimens and nanomaterials for examination by transmission electron microscopy are described. This technique is a preferred method for revealing ultrastructural features and specializations of biological membranes and for obtaining ultrastructural level dimensional and spatial data in materials sciences and nanotechnology products.
03:12
Freezing Point Depression and Boiling Point Elevation
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2020
Boiling Point Elevation The boiling point of a liquid is the temperature at which its vapor pressure is equal to ambient atmospheric pressure. Since the vapor pressure of a solution is lowered due to the presence of nonvolatile solutes, it stands to reason that the solution’s boiling point will subsequently be increased. Vapor pressure increases with temperature, and so a solution will require a higher temperature than will pure solvent to achieve any given vapor pressure, including one...
FAQs
Rapid heat removal shortens the interval in which water within biological material can organize into large ice crystals. That reduced ice-crystal growth can lessen mechanical damage to cells and tissues, helping preserve their structure and composition. The principle is especially important when later medical analysis or storage depends on maintaining the original characteristics of the specimen.
Cryoprotective agents provide an additional protective measure during cooling by helping limit damage associated with ice formation. They do not replace the need for rapid heat removal; instead, some protocols combine both approaches. Their inclusion is therefore protocol-dependent, with the intended benefit of improving preservation of biological materials during medical storage or handling.
The main distinction is the rate at which heat is removed. Shock freezing reduces temperature more quickly than conventional freezing, leaving less time for large ice crystals to develop. Because large crystals can cause mechanical damage, the faster approach may better preserve cellular and tissue structure for subsequent storage, diagnostics, research, or method development.
Preservation depends primarily on how quickly heat is removed and whether the protocol includes cryoprotective agents. Faster cooling limits the opportunity for large ice crystals to form, while cryoprotectants can provide additional protection. These variables influence how effectively the process maintains the structure and composition needed for reliable medical analysis or storage.
Medical uses include the storage and analysis of blood components, biological specimens, cells, and tissue samples. The technique is therefore relevant to materials with different structural and compositional requirements, rather than being limited to one specimen type. Its value lies in supporting preservation for later examination, research, or development of cryopreservation methods.
By helping maintain consistent sample characteristics, Shock Freezing supports preparation of materials for diagnostics and research. Preserved blood components, specimens, cells, or tissues can then serve as more consistent inputs for analysis. The technique also contributes to developing cryopreservation methods by providing a rapid-cooling approach whose effects on biological structure and composition can be evaluated.