| 词条 | Artificial gills (human) |
| 释义 |
Artificial gills are unproven conceptualised devices to allow a human to be able to take in oxygen from surrounding water. This is speculative technology that has not been demonstrated in a documented fashion. Natural gills work because nearly all animals with gills are thermoconformers (cold-blooded), so they need much less oxygen than a thermoregulator (warm-blood) of the same size.[1] As a practical matter, therefore, it is unclear that a usable artificial gill could be created because of the large amount of oxygen a human would need extracted from the water. MethodsSeveral potential methods exist for the development of artificial gills. One proposed method is the use of liquid breathing with a membrane oxygenator to solve the problem of carbon dioxide retention, the major limiting factor in liquid breathing.[2][3]{{dubious|reason=Disolved oxygen content of water is the limiting factor as referenced below.|date=December 2017}} It is thought that a system such as this would allow for diving without risk of decompression sickness.[4] They are generally thought to be unwieldy and bulky, because of the massive amount of water that would have to be processed to extract enough oxygen to supply an active diver, as an alternative to a scuba set. An average diver with a fully closed-circuit rebreather needs 1.5 liters of oxygen per minute while swimming or .64 liters per minute while resting.[5] As a result, at least {{convert|192|L|USgal}} of sea water per minute would have to be passed through the system, and this system would not work in anoxic water. Seawater in tropical regions with abundant plant life contains 5–8 mg of oxygen per liter of water.[6] These calculations are based on the dissolved oxygen content of water. See also{{portal|Underwater diving}}
References1. ^Why don't people have gills? {{webarchive |url=https://web.archive.org/web/20071111030608/http://express.howstuffworks.com/mb-gills.htm |date=11 November 2007 }} 2. ^{{cite journal |vauthors=Landé AJ, Claff CL, Sonstegard L, Roberts R, Perry C, Lillehei CW |title=An extracorporeal artificial gill utilizing liquid fluorocarbon |journal=Fed. Proc. |volume=29 |issue=5 |pages=1805–8 |year=1970 |pmid=5466244 |doi= |url=}} 3. ^{{cite journal |author=Landé, AJ |title=Sequenced, hemoglobin based artificial gills synthetic gill supports diver's or climber's breathing by concentrating O2 from seawater or from thin air at altitude, and venting CO2 |journal=Undersea and Hyperbaric Medicine (Annual Scientific Meeting Abstract) |year=2006 |url=http://archive.rubicon-foundation.org/3675 |accessdate=2009-03-22 }} 4. ^{{cite journal |author=Landé, AJ |title=Artificial gill complements liquid breathing for diving to great depths, without being threatened by the bends |journal=Undersea and Hyperbaric Medicine (Annual Scientific Meeting Abstract) |year=2006 |url=http://archive.rubicon-foundation.org/3674 |accessdate=2009-03-22 }} 5. ^{{cite journal |author=Knafelc, ME |title=Oxygen Consumption Rate of Operational Underwater Swimmers. |journal=United States Navy Experimental Diving Unit Technical Report |volume=NEDU-1-89 |url=http://archive.rubicon-foundation.org/7406 |accessdate=2009-03-22 }} 6. ^Fundamentals of Environmental Measurement External links
3 : Diving medicine|Underwater breathing apparatus|Membrane technology |
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