Word: ultraviolet
(lookup in dictionary)
(lookup stats)
Dates: all
Sort By: most recent first
(reverse)
...first abnormal cells get that way? The experts cannot agree. Columbia University's Dr. Samuel Graff expresses the current consensus: all cancerous cells are the result of mutation, and mutations can be set off by many known factors-inherited defective genes, radiation by X or gamma rays, ultraviolet light, many chemicals, including some of the huge class of hydrocarbons, physical irritation of tissues, and certainly in some animal cancers by the invasion of a virus. There may be other, still unknown factors causing mutation...
Have the Mormons not heard that pigmentation is nature's device for filtering out ultraviolet rays? It is, then, an act of God's mercy, not vengeance...
...detect DNA and RNA, the Army team used acridine orange, a fluorochrome dye that easily unites with the nucleic acids and shines brightly under ultraviolet light. Result: the higher the cell's nucleic acid content, the more intense the fluorescence (green to yellow for DNA, red for RNA). After a few hours of training, a skilled cyto-technologist can spot malignant cells by the intensity of fluorescence he sees in his microscope...
...slot machines of Las Vegas, Nev., Dr. Edward Teller described a scheme to explode a nuclear charge 100 million miles away from the earth. The purpose would be to test a key assumption of Einstein's theory of relativity: that every kind of electromagnetic radiation (light, infrared, ultraviolet, radio waves, X rays and gamma rays) travels at the same speed-186,000 miles a second...
...disk. But astronomers have long known that its face is mottled with hot clouds of hydrogen gas, which seem to be the source of some of the radiation that periodically disrupts radio communication, and may have an important effect on the earth's weather. The clouds give off ultraviolet rays on the so-called Lyman-alpha line of the spectrum, midway between visible light and X rays. Since these rays are absorbed by the earth's atmosphere long before they can reach the ground, no earthbound camera has ever been able to make a photographic record...