cryoprotectant A substance that helps to protect an organism's tissues from the effects of freezing. Cryoprotectants are vital to the survival of those organisms living in cold climates that adopt a strategy of tolerating a limited amount of freezing of their tissue fluids. Such organisms include certain insects, molluscs, and nematodes, and even some frogs, lizards, and turtles. One group of these substances consists of antifreeze molecules, notably glycerol and related polyhydric alcohols (polyols). Another group of cryoprotectants bind to membranes within cells and prevent the binding of water molecules, so preserving the integrity of cell structures. Examples in insects include proline and trehalose. See also ice-nucleating agent.
More From encyclopedia.com
Parenchyma , parenchyma 1. A plant tissue consisting of roughly spherical relatively undifferentiated cells, frequently with air spaces between them. The cortex a… unicellular , u·ni·cel·lu·lar / ˌyoōnəˈselyələr/ • adj. Biol. (of protozoans, certain algae and spores, etc.) consisting of a single cell. ∎ (of an evolutionary or… Extracellular Matrix , Extracellular matrix The extracellular matrix is a meshwork of proteins and carbohydrates that binds cells together or divides one tissue from anothe… Tissue , Tissue Tissue is the name for a group of similar cells that have a common structure and function and which work together. Tissues fit together to for… ground substance , ground substance The matrix of connective tissue, in which various cells and fibres are embedded. The ground substance of cartilage consists of chond… Phloem , phloem (bast) A tissue that conducts food materials in vascular plants from regions where they are produced (notably the leaves) to regions, such as…
About this article
Updated About encyclopedia.com content Print Article
You Might Also Like