Word: ultraviolet
(lookup in dictionary)
(lookup stats)
Dates: during 1970-1979
Sort By: most recent first
(reverse)
...attempt to determine whether organic molecules can form on other planets, scientists at Ponnamperuma's Laboratory of Chemical Evolution filled a container with gases like those in the atmosphere of Jupiter. Then, to simulate sunlight and Jovian lightning flashes, they exposed the gases to ultraviolet light and shot electric discharges through them. The brown and yellow hues of the organic compounds that formed in the container closely resemble those in the spectacular pictures of the Jupiter clouds taken by the Voyager 1 and 2 spacecraft, which flew by the planet earlier this year. This finding strongly suggests that organic...
Chloroflourocarbon is the chemical name for gases composed of chlorine, fluorine and carbon that have come to be known simply as flourocarbons. The chlorine has been found to deplete the earth's protective umbrella of ozone in the stratosphere, increasing the planet's exposure to the sun's ultraviolet radiation...
...report, published in the New England Journal of Medicine, indicates that most patients face no additional risk from the new technique, which uses a combination of ultraviolet light and special drugs...
...Space Telescope, a 2.4 m (94 in.) mirror scheduled to be placed in orbit by the space shuttle in the early 1980s. Flying above the obscuring atmosphere, this observatory should pick up a variety of celestial phenomena, including infrared and ultraviolet radiation, and reveal hidden structural details of galaxies that may harbor black holes...
...peasant growers of the Sierra Madre soon developed a new strategy to combat the herbicides. Paraquat kills in the sun. Its chemistry requires about three days of ultraviolet rays in order to destroy the plants on which it has been sprayed. To save the marijuana, peasants began to rush out and harvest the plants minutes after the helicopters were gone; they put their plants in bags to shield them from the sun. Even though they had been sprayed, the leaves of plants so shielded did not yellow. The plants appeared normal, so the peasants could sell them as if they...