X-Message-Number: 26224 From: "Igor Artyuhov" <> References: <> Subject: Buying Time in Suspended Animation: Cover Story in the Scientific American June 2005 issue Date: Mon, 23 May 2005 13:17:55 +0400 Buying Time in Suspended Animation By Mark B. Roth and Todd Nystul An ability to put the human body on hold could safeguard the critically injured or preserve donor organs for transport. Does the power to reversibly stop our biological clocks already lie within us? Fantasy writers have long been captivated by the possibility of preserving human life in a reversible state of suspended animation. In fictional tales the technique enables characters to "sleep" through centuries of interstellar travel or terrestrial cataclysms, then awaken unaffected by the passing of time. These stories are great fun, but their premise seems biologically far-fetched. In reality, we humans do not appear capable of altering our rate of progression through life. We cannot pause the bustling activity of our cells any more than we can stop breathing for more than a few minutes without sustaining severe damage to vital organs. Nature, however, abounds in organisms that can and do reversibly arrest their essential life processes, in some cases for several years at a time. Scientists describe these phenomena by a variety of terms--quiescence, torpor, hibernation, among others--but all represent different degrees of suspended animation, a dramatic reduction of both energy production (metabolism) and energy consumption (cellular activity). What is more, organisms in this state enjoy extraordinary resistance to environmental stresses, such as temperature extremes, oxygen deprivation and even physical injury....continued at Scientific American Digital (http://sciam.com/article.cfm?chanID=sa006&colID=1&articleID=000B97C7-074E-1 289-BC2083414B7F0000) Rate This Message: http://www.cryonet.org/cgi-bin/rate.cgi?msg=26224