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Created page with 'File:lighterstill.jpgright|frame ==Etymology== [http://nordan.daynal.org/wiki/index.php?title=English#ca._1100-1500_.09THE_MIDDLE_ENGLISH_PERIOD Mid...'
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==Etymology==
[http://nordan.daynal.org/wiki/index.php?title=English#ca._1100-1500_.09THE_MIDDLE_ENGLISH_PERIOD Middle English], from Anglo-French, from maintenir
*Date: [http://www.wikipedia.org/wiki/14th_Century 14th century]
==Definitions==
81 : the [[act]] of maintaining : the [[state]] of [[being]] maintained : [[support]]
*2 : something that maintains
*3 : the upkeep of property or equipment
*4 : an officious or unlawful intermeddling in a legal suit by assisting either party with means to carry it on
==Description (Biology)==
'''Maintenance''' of an [[organism]] is the collection of [[processes]] to stay alive, excluding production processes. [http://en.wikipedia.org/wiki/Dynamic_Energy_Budget The Dynamic Energy Budget] [[theory]] delineates two classes.
*'''Somatic maintenance'''. This comprises mainly the turnover of structural [[mass]] (mainly proteins) and the maintenance of concentration gradients of metabolites across membranes (e.g., counteracting leakage). This is related to maintenance respiration.
*'''Maturity maintenance'''. This comprises the maintenance of [[defense]] systems (such as the [http://en.wikipedia.org/wiki/Immune_system immune system]), the [[preparation]] of the [[body]] for reproduction.
The [[theory]] assumes that [[maturity]] maintenance costs can be reduced more easily during starvation than somatic maintenance costs. Under extreme starvation conditions, somatic maintenance costs are paid from structural mass, which causes shrinking.Some organisms manage to switch to the [http://en.wikipedia.org/wiki/Turpor turpor] state under starvation conditions, and reduce their maintenance costs.
[[Category: General Reference]]
[[Category: Biology]]
==Etymology==
[http://nordan.daynal.org/wiki/index.php?title=English#ca._1100-1500_.09THE_MIDDLE_ENGLISH_PERIOD Middle English], from Anglo-French, from maintenir
*Date: [http://www.wikipedia.org/wiki/14th_Century 14th century]
==Definitions==
81 : the [[act]] of maintaining : the [[state]] of [[being]] maintained : [[support]]
*2 : something that maintains
*3 : the upkeep of property or equipment
*4 : an officious or unlawful intermeddling in a legal suit by assisting either party with means to carry it on
==Description (Biology)==
'''Maintenance''' of an [[organism]] is the collection of [[processes]] to stay alive, excluding production processes. [http://en.wikipedia.org/wiki/Dynamic_Energy_Budget The Dynamic Energy Budget] [[theory]] delineates two classes.
*'''Somatic maintenance'''. This comprises mainly the turnover of structural [[mass]] (mainly proteins) and the maintenance of concentration gradients of metabolites across membranes (e.g., counteracting leakage). This is related to maintenance respiration.
*'''Maturity maintenance'''. This comprises the maintenance of [[defense]] systems (such as the [http://en.wikipedia.org/wiki/Immune_system immune system]), the [[preparation]] of the [[body]] for reproduction.
The [[theory]] assumes that [[maturity]] maintenance costs can be reduced more easily during starvation than somatic maintenance costs. Under extreme starvation conditions, somatic maintenance costs are paid from structural mass, which causes shrinking.Some organisms manage to switch to the [http://en.wikipedia.org/wiki/Turpor turpor] state under starvation conditions, and reduce their maintenance costs.
[[Category: General Reference]]
[[Category: Biology]]