Enantiostasis
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2008-06-29T04:47:40Z
IceCreamAntisocial
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'''Enantiostasis''' is the ability of an [[open system]], especially a living [[organism]], to stabilize and conserve function in spite of an unstable environment. Estuarine organisms typically undergo enantiostasis in order to survive with constantly changing salt concentrations. The [[Board of Studies|NSW Board of Studies]] defines the term in its Biology syllabus as "the maintenance of metabolic and physiological functions in response to variations in the environment"<ref>http://www.hsc.csu.edu.au/biology/core/balance/9_2_3/923net.html</ref>.
Enantiostasis is not a form of [[homeostasis]]. Rather than maintaining homeostatic (stable ideal) conditions, enantiostasis involves maintaining only functionality in spite of external fluctuations.
The term enantiostasis was proposed by Mangum and Towle<ref>Mangum, C. P., & Towle D. W., 1977, ''American Scientist'' '''65''', 67-75</ref>. It is derived from the [[Greek language|Greek]] ''enantios'' (opposite, opposing, over against) and ''stasis'' (to stand, posture).
An example of an organism which undergoes enantiostasis in an estuary environment includes-
* Blue Legged Crabs' hemoglobin equivalent — hemocyanin — does not bind to oxygen as efficiently when the crab is in a low potassium, low sodium environment. To stabilize, the crab lowers its internal pH to allow the hemocyanin to function efficiently.
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[[Category:Ecology]]