Word: nitrogen
(lookup in dictionary)
(lookup stats)
Dates: during 1960-1969
Sort By: most recent first
(reverse)
...Southern California's much-touted sunshine is, ironically, an essential accomplice in making smog so irritating to the eyes and so dangerous to health. The assorted hydrocarbons and nitrogen oxides spewed out by chimney stacks and tail pipes are bad enough in the raw. But sunlight sets up photochemical reactions involving such chemicals as ozone (a deadly poison) and nitrogen dioxide (an insidious and lethal gas when it hits the lungs). U.S. Public Health Service Toxicologist Sheldon Murphy neatly proved the perils of sunlight by exposing guinea pigs to city-street concentrations of exhausts. Unirradiated, the gases did little...
When Watson and Crick began their research in England, DNA (Deoxyribose Nucleic Acid) had already been identified as the genetic substance of cells. Information on its chemical composition suggested that it was a very long, thin molecule made up of sugar groups (deoxyribose), phosphate groups, and nitrogen-containing "bases." Further, X-ray diffraction patterns of fibrous DNA indicated that the form of the molecule was a double helix...
Everywhere there is color. The huge concrete shielding blocks are green, purple, and gray. Pipes are blue, nitrogen tanks a vivid yellow, heavily insulated cables are red, and black. Overhead ventilation ducts are fire red. The personnel of the C.E.A. are oblivious to the gaudy, nursery school quality of their surroundings. "It's better than just having everything gray," said a technician, "but I don't suppose it really matters much. You get used to the color, whatever...
...m.p.h.* Command to Jets. Mariner II was now under radio command from California Institute of Technology's Jet Propulsion Laboratory. The first order was received and obeyed: large, flat solar panels (see diagram) sprang into position. In a series of maneuvers, Mariner's ten tiny nitrogen jets swiveled the spacecraft until its long axis pointed at the sun. So positioned, the solar panels could absorb the sun's energy, power the spacecraft's electrical system without draining its silver-zinc battery...
Some have theorized that the planet is nothing but a baked desert; others that it is covered with oceans. Still others have concluded that Venus' atmosphere is mostly carbon dioxide and nitrogen; they argue that there is neither enough water nor enough oxygen there to support life...