They're portable, low oxygen chambers used by many of the world's best athletes to improve their endurance and aerobic performance.
Dave's a 40-year-old doctor and he marvels at the way his body has adapted to the many hours breathing in low oxygen.
Low oxygen (hypoxic) areas known as dead zones, where most marine life cannot survive, can result in the collapse of some ecosystems.
"We strongly believe if we can identify molecular pathways controlling healthy response to low oxygen, we can develop new ideas for treating COPD, " Dr. Roach says.
WSJ: Mayo Clinic Researchers on Everest Study High Altitude's Effects on the Body
He worries that if you ban the low oxygen or hypoxic tents, some may wonder why not ban those athletes who actually live at a high altitude and then train down below?
The researchers did note that many of the cases of lightheadedness could be due to the relatively low oxygen content of cabin air-roughly equal to 8, 000 feet above sea level-or to passengers experiencing dehydration during long or multiple flights.
Of great interest is the physiological pathway called the hypoxia-inducible factor, or HIF, which seems to trigger the body's response to low-oxygen levels in tissue.
WSJ: Mayo Clinic Researchers on Everest Study High Altitude's Effects on the Body
If, however, they are subjected instead to pyrolysis a process of controlled burning in a low-oxygen atmosphere the result is charcoal, a substance that is mostly elemental carbon.
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By studying the climbers, six of whom reached the summit, the researchers hope to gain insight into heart failure, lung disease and sleep apnea all conditions related to a low-oxygen, or hypoxic, state.
WSJ: Mayo Clinic Researchers on Everest Study High Altitude's Effects on the Body
There had been concern that low levels of oxygen in the water caused by the spell of hot and dry weather during the month would damage their welfare.
Nutrient overloads lead to low levels of dissolved oxygen in the water, which can kill fish.
And this would only happen if the Soyuz rockets are not returned to flight before critical supplies of oxygen, water and food run low.
The Department of Culture, Arts and Leisure said it believed the fish died due to low water levels, increased temperature and a lack of oxygen.
Cameras lowered into previous holes drilled into the mountain turned up no signs of the miners, and tests showed that oxygen levels in parts of the mine were too low to sustain human life.
The risk here is that as Huawei and ZTE continue their assault on low-end smartphone market, the arrival of iPhone 4S will suck the oxygen out of the high-end smartphone segment, triggering order cancellations from Samsung, Nokia, LG, Sony Ericsson and HTC.
At the current low levels of atmospheric carbon dioxide, rubisco in C3 plants can be fooled into substituting oxygen molecules for carbon-dioxide molecules.
WSJ: Harrison H. Schmitt and William Happer: In Defense of Carbon Dioxide
The mice's consumption of oxygen and production of carbon dioxide dropped ten minutes after they began inhaling hydrogen sulphide and remained extremely low as long as the gas was administered.
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