Word: urea
(lookup in dictionary)
(lookup stats)
Dates: all
Sort By: most recent first
(reverse)
...dropped into a tube containing a solution of potassium phosphate, sodium dithionite and saponin. Clouding of the solution is a danger signal but does not specifically identify hemoglobin S. If the first round arouses suspicion, a second test, also based on Murayama's work, is performed immediately. Urea, a natural waste substance produced by the normal liver, breaks some molecular bonds in abnormal hemoglobin. When urea is added to the solution that had shown a positive reaction initially, the liquid clears quickly if hemoglobin S is present...
Medicine still has no cure for this inherited illness. But a team of Michigan medical researchers has just announced a discovery that offers new relief for sickle-cell sufferers. By treating the patient with a solution of urea and invert sugar, say the researchers, the sickling tendency can be reversed and the misshapen cells returned to normal...
...Grand Rapids, owes its discovery to the work of another researcher, Makio Murayama of the National Institutes of Health. Murayama discovered that the sickle-cell shape is caused by an abnormal bonding between hemoglobin molecules in the red cells. Using this knowledge, Nalbandian's team decided to try urea, a waste substance produced by the normal human liver and excreted in the urine. As they knew, urea can dissolve certain types of molecular bonds. Their experiment worked: urea broke the bond between the hemoglobin molecules, halted the sickling effect, and relieved the victims' pain...
...Beeps. In Viet Nam, the ammonia is produced by groups of perspiring men. Urea, a component of perspiration, is attacked by bacteria on the skin and decomposed into odorless carbon dioxide and ammonia gas. Thus the air in the vicinity of a large group of men-especially in hot and humid climates-contains high concentrations of ammonia. To detect the ammonia, the E63 scoops up air, passes it over a wick saturated with hydrochloric acid and into a humidifying chamber. If the air contains any ammonia, a fog forms, changing the amount of light shining on a photoelectric cell...
...sales to U.S. clothing manufacturers. Lee's sugar refinery at Pusan, started in 1953, provided the nation with a psychological lift because it was built at a time when the war with North Korea had left few businessmen willing to risk their capital on long-term investments. The urea-fertilizer plants, which will help make South Korea self-sufficient in fertilizer, are Lee's biggest project yet. His favorite enterprise is the Joong-Ang Mass Communications Center, headquartered in a nine-story Seoul office building where Lee works surrounded by teak-paneled walls and a collection of Oriental...