Cryo-preservation or cryo-conservation could be a method wherever organelles, cells, tissues, animate thing matrix, organs, or the other biological constructs at risk of injury caused by unregulated chemical dynamics are preserved by cooling to terribly low temperatures(typically −80 °C victimization solid greenhouse gas greenhouse gas °C victimization liquid nitrogen). At low enough temperatures, any catalyst or chemical activity which could cause injury to the biological material in question is effectively stopped. Cryopreservation ways request to achieve low temperatures while not inflicting further injury caused by the formation of ice crystals throughout cooling. Ancient cryopreservation has relied on coating the fabric to be frozen with a category of molecules termed cryoprotectants. New ways are perpetually being investigated thanks to the inherent toxicity of the many cryoprotectants. By default it ought to be thought of that cryopreservation alters or compromises the structure and performance of cells unless it's well-tried otherwise for a selected cell population. Cryoconservation of animal genetic resources is that the method within which animal genetic material is collected and hold on with the intention of conservation of the breed. Water-bears (Tardigrada), microscopic cellular organisms, will survive freeze by exchange most of their internal water with the sugar trehalose, preventing it from crystallization that otherwise damages cell membranes. Mixtures of solutes are able to do similar effects. Some solutes, as well as salts, have the disadvantage that they'll be harmful at intense concentrations. Additionally to the water-bear, wood frogs will tolerate the freeze of their blood and alternative tissues.  

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