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Science Over the EdgeA Roundup of Strange Science for the MonthApplet credit: Ed Hobbs
January 2006 |
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The idea of cryogenically preserving by a person and thawing them out later - sort of like a frozen dinner - has long been a staple of science fiction, but so far scientists have not figured out how to make it work. The reason is ice. Most of the human body is water and water expands when it freezes. This is the reason the pipes in your house will crack open if they are filled with water and your heater fails in freezing temperatures. The expansion of the water in a human body systems wrecks the delicate structure of cell tissue throughout the body. Scientists have tried to counteract this by mixing substances like glycerol in with body fluids to act as sort of a biological antifreeze, but the results have not yet been fully successful. If such a system could be developed it could, in theory, be used to freeze a human indefinitely. Another, perhaps more promising approach, to the problem is not to literally "freeze" a person, but to put them into hibernation. Many animals, including bears, hibernate by lowering their body temperature and metabolism. Just recently scientists have demonstrated the ability to put mice into a state of "suspended animation" by having them breath air laced with hydrogen sulfide. While high concentrations of this gas would be fatal, just the right amount seems to put the mice to sleep and their metabolic rates dropped by 90%. They were revived by simply returning the air they were breathing to normal. As metabolism is not stopped with this method, but just slowed, it could not be used to preserve humans indefinitely. There would be many uses for such a state of suspended animation. Currently trips to other planets in our solar system, or beyond, could take many months or years and the trip would be made much simpler - less food, drink and psychological stress - if the astronauts slept most of the way. The technique could also be used to preserve organs for transplantation or have critical patients hibernate through operations or recovery.
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LGM: Science over the Edge ArchivesLGM Archive 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006 Copyright Lee Krystek 2005. All Rights Reserved. |