Word: zinc
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Last February the FDA rejected as premature applications by vitamin makers to promote folic acid as a means of preventing neural-tube birth defects, antioxidants as a hedge against cancer, and zinc as a booster of aging immune systems. Both federal and state regulatory agencies have been cracking down on nutrient health claims. The FDA says it will hold label claims to standards similar to those applied to drugs. Advises Dr. Walter Willett of the Harvard School of Public Health: "At this time I say don't take megadoses, but I'm not ruling out that in two or three...
Should works of art carry a government health warning? A piece being displayed at New York City's New Museum of Contemporary Art could have used such a caveat. When Eclipse of the Earth by Kazuo Katase was installed last month, the work's dusty red coloring agent contained zinc sulfide and barium sulfate. The chemicals caused severe respiratory and skin problems for some employees, they claim. A staff memo admitted that "ingestion of the pigment will cause illness, and the inhalation of the dust is known to cause lung irritation." Although the powder was replaced 12 days later, three...
Some geologists, including Paul Hoffman, a research scientist at the Geological Survey of Canada, believe that the new map could point the way to valuable mineral discoveries. If the theory proves correct, silver, copper and zinc (all found in eastern Australia) should also turn up in northwestern Canada. But scientists caution that before anybody rushes out with a prospector's pick, research must confirm that the rocks in the Western U.S. are really related to those in eastern Antarctica. Dalziel estimates that this comparison should take no more than six months -- a short wait to clear up a mystery that...
...conventional counterparts, the materials are made with extra ingredients that greatly enhance their performance or give them new features. By blending in stiff carbon fibers, for example, modern-day alchemists have developed plastics that are up to 10 times as strong as conventional plastics. And by mixing copper with zinc and aluminum, scientists have produced a metal with a "memory": the stuff returns to its original shape after being bent or twisted...
There is no certainty that commercially valuable deposits of minerals exist. Surface rocks contain traces of iron, titanium, low-grade gold, tin, molybdenum, coal, copper and zinc. Gaseous hydrocarbons, sometimes associated with oil, have been found in bottom samples taken from the Ross Sea. But in most cases, says geologist Robert Rutford, president of the University of Texas at Dallas, who did research in Antarctica for more than 20 years, "minerals are less than 1% of the total rock sample analyzed." Moreover, the vicious Antarctic climate would make exploration dangerous and expensive...