Word: oxygenate
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...organisms capable of photosynthesis-the chemical process by which green plants use the energy of sunlight to convert carbon dioxide and water into food and oxygen-show a marked chemical preference for carbon 12, which is the lighter of the two isotopes. As a result, the carbon in the organic compounds that make up the plants' structure consists largely of carbon 12. What is more, the greater preponderance of that isotope becomes preserved in the earth's geological records when, for example, tiny green sea plants (plankton) die, sink to the ocean bottom, gradually decompose and become part...
...laconic account of the road back from disaster. Six years ago, when he was 51, Tex Maule, a SPORTS ILLUSTRATED editor, had a massive heart attack. He almost died then and there, mainly because he stumbled out of bed rather than accept a bedpan and crashed into his own oxygen supply...
...long and 5 ft. in diameter-will be pulled from the booster by the Apollo command ship. In position between Apollo and Soyuz during the docking, it will act as an essential decompression chamber for men passing from Soyuz's "normal" atmosphere of 70% nitrogen and 30% oxygen (at sea-level pressure of 14.7 Ibs. p.s.i.) to Apollo's low-pressure (5 Ibs. p.s.i.) atmosphere of pure oxygen.* If they did not stop in the chamber on the way from Soyuz into Apollo, spacemen would get the bends-the sometimes fatal buildup of nitrogen bubbles in the bloodstream...
...chose a pure oxygen environment because it requires less plumbing, saves weight and is easier to manage...
...electrocardiograph. "It simply isn't enough to run an electrocardiogram on a heart at rest," says she. "We have to road-test it to see how well it performs under a work load." In this examination the patient pedals a bicycle-like device against increasing resistance. Meanwhile, his oxygen consumption is being measured, and the electrocardiograph is tracing heart reaction. The test continues until the heart reaches 85% of its maximum rate or until the patient-experiences some distress. The procedure allows Zohman to weed out people who are not up to any strenuous activity. For those...