Word: ratio
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Dates: during 1990-1999
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...chemical composition of rocks like limestone, which incorporate two isotopes of carbon in proportion to their abundance in seawater - carbon 12, which is preferentially taken up by algae during photosynthesis, and carbon 13, its slightly heavier cousin. By sampling ancient limestones, Knoll and his colleagues have determined that the ratio of carbon 12 to carbon 13 remained stable for most of the Proterozoic Eon, a boggling expanse of time that stretched from 2.5 billion years ago to the end of the Vendian. But at the close of the Proterozoic, just prior to the Cambrian explosion, they pick up a dramatic...
Even before the bleak Christmas outlook, the U.S. retailing industry was suffering through a traumatic restructuring brought on by too few shoppers and too many stores. Retailers have nearly doubled their selling space since 1985, bringing it to a ratio of 19 sq. ft. for every man, woman and child in the U.S. "There will be closed and empty stores in almost every single mall in the country," says retail analyst Walter Loeb. "Some customers are going to feel like they're shopping in ghost towns...
Professor of English and Comparative Literature James Engell, the president of the Alpha Iota Chapter, downplayed the importance of any gender gaps at this stage of the elections, arguing that the male female ratio that really counts is the final ratio that comes after the third election...
...time it takes to treat each patient is necessarily extended when doctors are being trained, so the IME is based on "teaching intensity," or the ratio of the number of residents to beds. The more intensive the care the more payment the hospital receives...
Besides the women-men ratio, another significant feature of the Class of '99 is its high proportion of older candidates. This year there are 54 students over the age of 24, including a 45-year old high school science teacher...