Word: nitrogenating
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...procedures. In those cases, the only way a doctor can determine if a lump is cancerous is to have a biopsy performed, usually as a surgical procedure. A surgeon removes the lump and it is rushed to the hospital's pathology laboratory. There it is frozen with liquid nitrogen and then, with a device called a microtome, sliced into sections thinner than onion skin for examination under a microscope. If the cells are cancerous, the surgeon will usually know in minutes...
...Clean Air Act of 1970 mandated a 90 per cent cut in carbon monoxide and hydrocarbon emissions for 1975 cars. It also set a 1976 deadline for a similar cut in harder-to-control nitrogen oxide emissions. Both deadlines have since been extended to 1977-78 by the Energy Emergency...
...into the breast and within about ten minutes had removed the lump. It proved to be 2 cm. in circumference-no bigger than the tip of a man's little finger. A technician rushed the lump to the pathology department, where it was fast-frozen with liquid nitrogen. A thin slice was cut, which a pathologist examined under a microscope. Within five minutes the message was relayed to Fouty: malignant cells. In a 2½-hour procedure, Fouty removed the entire right breast, its underlying pectoral muscle, and lymphoid tissue in the adjacent armpit. This tissue was also sent...
Even as Los Angeles struggled with its auto-emissions problem, word came from Cambridge, Mass., about a more widespread future emissions problem: nitrogen oxides from the SST. During the 1971 debate that led to the cutting off of U.S. Government funds for the supersonic transport, environmentalists had voiced fears that nitrogen oxides in the exhaust of the 1,800-m.p.h. aircraft might weaken the ozone shield that protects the earth from an overdose of the sun's ultraviolet rays. The charge was serious, but was it true? The U.S. Department of Transportation commissioned researchers at the Massachusetts Institute...
Though that number seems high-only a prototype of the Anglo-French Concorde and two Soviet TU-144s are now flying-most aviation experts predict that at least 500 SSTs will be in service by the end of the century. If they all fly, the researchers warn, the nitrogen oxides generated would have a thinning effect on the ozone shield. Without this critical protection, people would run a much higher risk of going blind and of contracting skin cancer...