Word: oxygenate
(lookup in dictionary)
(lookup stats)
Dates: all
Sort By: most recent first
(reverse)
What happens in a stroke (which doctors call a cerebrovascular accident or CVA) seems superficially simple: a shutdown of any kind in one of the arteries in the neck or head cuts off the essential supply of blood and oxygen to part of the brain, which then "dies." For unlike cells in flesh, or even in bone, which go on multiplying until near the end of life, brain cells have virtually no power to reproduce themselves. Medicine can only rely on whatever self-healing capacity the damaged brain area has-or find some way to stimulate another part...
Besides petroleum and oxygen, the oil eaters require inorganic salts, which act like fertilizers. The bugs are content with a very low grade of petroleum, and since they have the happy habit of eating its least valuable constituents, they leave it more valuable than when they started grazing on it. One ton of petroleum thus consumed produces about one ton of dry material that is half protein When fresh the stuff is white and tasteless, but as it ages it turns brown, smells like a new plastic toy and develops a delicately chemical flavor. Some samples according to French experimenters...
Compelled to Reconsider. Soviet physicians are justifiably proud that they brought Landau, the year's Nobel laureate in physics (TIME, Nov. 9), back to life. Landau's brain had been starved of blood and oxygen for more than 100 days. "It was held previously," says Director Boris Yegorov of Moscow's Institute of Neurosurgery, "that oxygen deficiency of the brain cells inevitably led to their destruction. The Landau case compels us to reconsider the whole of accumulated medical experience. It has overthrown all existing theories." Neurologists outside Russia would not go as far as that. What...
Though smoke and smog the world over inevitably damage the airways leading to the lungs and the oxygen-exchange cells in the walls of the lungs themselves, the effects usually appear slowly. There is an imperceptibly progressive shortness of breath. After years of decreased breathing volume and oxygen exchange, the heart has to work harder to pump more blood, and may fail in the process. The damage shows up dramatically when the lungs are subjected to added stress-from infection or vigorous exertion. This sort of weakness, said Colonel Phelps, is an increasing cause of medical retirement among officers aged...
...gained on the airplane-engine project, this SNAP (for Systems for Nuclear Auxiliary Power) contains liquid lithium and gaseous potassium, tricky fluids that would drive most engine designers to seek liquid solace. Molten lithium is frightening stuff; it corrodes almost anything, and bursts into flame on contact with oxygen. Gaseous potassium, while not quite so bad, is hot and explosive...