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| Suspended animation ： ウィキペディア英語版 |
Suspended animation
Suspended animation is the slowing or stopping of life processes by exogenous or endogenous means without termination. Breathing, heartbeat, and other involuntary functions may still occur, but they can only be detected by artificial means.
Tiny organisms (e.g. embryos up to eight cells) can be cryogenically preserved and revived. Some have been kept in suspended animation for as long as 13 years.
Placing astronauts in suspended animation has been proposed as one way for an individual to reach the end of an interstellar or intergalactic journey, avoiding the necessity for a gigantic generation ship; occasionally the two concepts have been combined, with generations of "caretakers" supervising a large population of frozen passengers.
Since the 1970s, induced hypothermia has been performed for some open-heart surgeries as an alternative to heart-lung machines. Hypothermia, however, provides only a limited amount of time in which to operate and there is a risk of tissue and brain damage for prolonged periods.
== Experiments ==
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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