Word: assayed
(lookup in dictionary)
(lookup stats)
Dates: during 1990-1999
Sort By: most recent first
(reverse)
Each day, as the Earth turns, the BETA (for Billion-channel Extra-Terrestrial Assay) telescope sweeps a circular swath through the heavens, elevated at a slightly different fixed angle from the horizon with each successive turn. During each circuit it captures radio waves reaching Earth at frequencies between 1400 and 1720 megahertz--a broad but relatively "quiet" region of the radio spectrum. "In the 1960s we were looking in a few niches and hoping the extraterrestrials had put their jewels there," says astronomer Frank Drake, who launched the first SETI project in 1960. "They didn't. Now we are doing...
USING CURRENT TECHNIQUES, DOCTORS MUST WAIT up to 18 weeks for laboratory . results to identify which drugs effectively treat strains of tuberculosis. Now scientists have come up with an ingenious assay that promises to cut that time in half -- literally by shedding a new light on TB. Their bright new idea comes from the same gene that makes fireflies glow...
...basis for the new assay, PSA, is a protein produced by cells on the surface of the prostate and thought to play a role in preventing semen from coagulating. An enlarged prostate (due to cancer or other problems) leads to higher levels of PSA in the blood. Doctors already use PSA tests to monitor the effectiveness of prostate-cancer therapies, such as irradiation or hormonal treatments. Some researchers have argued that the exams should replace much more expensive bone scans as a way of determining how far the cancer has spread...