Word: oxygenate
(lookup in dictionary)
(lookup stats)
Dates: all
Sort By: most recent first
(reverse)
...locked both molecules into various synthetic ring-shaped, larger molecules called "holders," which are in effect chemical vises. After many attempts, they hit upon a holder that gripped the ethyl alcohol and acetic acid so that they were properly oriented for combination; thus when the molecules met, their reacting oxygen and carbon atoms were always at the correct angle for electron snaring-and the reaction took place a million times faster. By "steering" the individual atoms, Koshland concluded, the holder molecule had apparently duplicated the exact role of an enzyme...
...blizzards sometimes entirely blocked off lower levels of the route. One snowstorm, in fact, occurred only a few weeks before last week's formal dedication. But by far the worst problem was the thin air at the top of the volcano. Headaches, dizziness and nausea, all symptoms of oxygen deficiency, were constant companions of the work crews. Even men recruited from high-altitude projects in the Rockies could not perform at more than 25% efficiency, if at all. "Some would come up, work a day, and then quit in disgust," recalls one workman. "They wouldn't even come...
...back as 1965, the 1,113-page report said, Apollo's prime contractor, North American Rockwell, had ordered that specifications for two small electric switches used to cut off the oxygen tank's internal heater be increased to 65 volts. Inexplicably, the subcontractor for the tanks, Beech Aircraft, kept delivering switches with a top rating of only 28 volts. Despite elaborate checkout procedures that were repeated through six previous Apollo manned missions, neither NASA nor its suppliers ever detected the oversight. Indeed, the error might never have been discovered if it had not been seriously compounded by other...
Unable to empty out the tank during tests at the Cape, NASA technicians applied 65 volts to the heater, trying to boil off the semiliquid oxygen. The voltage fused the inadequate 28-volt cutoff switches, allowing the temperature in the tank to rise to 1000° F. and damaging the Teflon insulation on the wires. This led to the arcing that occurred during the mission. Why did the Cape Kennedy technicians have to resort to this untried procedure for emptying the tank? Because, said the panel, the tiny tube through which oxygen is fed in and extracted had probably been...
Second, we must understand that the current means of production are destroying the environment. In his book Arcology, Paolo Soleri explains that the expansion of American suburbs is decreasing drastically the amount of breathing space left to the earth. Since green plants provide a lot of the oxygen we breathe, that is important for both the plants and us. Los Angeles smog has reportedly killed over a million of the Ponderosa pine in the hills outside the city. That destroys both watershed and forest...