Crenation (from modern Latin crenatus meaning "scalloped or notched", from popular Latin crena meaning "notch")[1] in botany and zoology, describes an object's shape, especially a leaf or shell, as being round-toothed or having a scalloped edge.[1]
The descriptor can apply to objects of different types, including cells, where one mechanism of crenation is the contraction of a cell after exposure to a hypertonic solution, due to the loss of water through osmosis.[2]: 229–230 In a hypertonic environment, the cell has a lower concentration of solutes than the surrounding extracellular fluid, and water diffuses out of the cell by osmosis, causing the cytoplasm to decrease in volume. As a result, the cell shrinks and the cell membrane develops abnormal notchings. Pickling cucumbers and salt-curing of meat are two practical applications of crenation.[2]: 229
Plasmolysis is the term which describes plant cells when the cytoplasm shrinks from the cell wall in a hypertonic environment. In plasmolysis, the cell wall stays intact, but the plasma membrane shrinks and the chloroplasts of the plant cell concentrate in the center of the cell.
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Cremation of human body
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What is crenation ?
Transcription
Red blood cells
Crenation is also used to describe a feature of red blood cells. These erythrocytes look as if they have projections extending from a smaller central area, like a spiked ball. The crenations may be either large, irregular spicules of acanthocytes, or smaller, more numerous, regularly irregular projections of echinocytes.[3] Acanthocytes and echinocytes may arise from abnormalities of the cell membrane lipids or proteins, or from other disease processes, or as an ex vivo artifact.
See also
References
- ^ a b "Crenate". Oxford Dictionaries. Archived from the original on July 31, 2012.
- ^ a b Stoker, HS (2012). General, Organic, and Biological Chemistry (6th ed.). ISBN 978-1133103943.
- ^ Kaushansky, K; Lichtman, M; Beutler, E; Kipps, T; Prchal, J; Seligsohn, U. (2010). Williams Hematology (8th ed.). McGraw-Hill. ISBN 978-0071621519.
External links
- Image from Cornell.edu
- Crenation at medical-dictionary.thefreedictionary.com
This page was last edited on 6 April 2023, at 14:05