Word: dna
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Dates: during 1990-1999
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Wilmut said Dolly, a seven-month-old ewe, was created by fusing a cell from an adult sheep with an egg from a different sheep. Because the DNA of the egg cell was removed, the DNA of the adult cell directed the subsequent growth and development...
...civil-trial transcript, 857 criminal-trial exhibits and some 700 civil-trial exhibits. On the wall was taped a separate profile of each juror, listing his or her education and any other inclinations the plaintiffs thought might be relevant, such as feelings about domestic violence or the reliability of DNA testing. To help select the jury, Petrocelli and Lambert turned to consultant Don Vinson and his DecisionQuest. (DecisionQuest is the jury consultant that the prosecutors in the criminal trial called in--and chose to ignore.) Petrocelli & Co. took Vinson's advice, which included using DecisionQuest to prepare all the boards...
Meselson is a case in point. I dropped by his office in Dec. 1995 because he had been awarded a lifetime medal for his contributions to genetics as a result of his research on how DNA chains replicate. Those of you who have taken genetics or biology courses may have heard of the Meselson-Stahl model of DNA recombination, now a fixture in genetics textbooks...
...changes the brain began accumulating in the 1970s. But only recently have researchers had tools powerful enough to reveal the precise mechanisms by which those changes are brought about. Neural activity triggers a biochemical cascade that reaches all the way to the nucleus of cells and the coils of DNA that encode specific genes. In fact, two of the genes affected by neural activity in embryonic fruit flies, neurobiologist Corey Goodman and his colleagues at Berkeley reported late last year, are identical to those that other studies have linked to learning and memory. How thrilling, exclaims Goodman, how intellectually satisfying...
...sort out which wires belong to which house, a problem that cannot be solved by genes alone for reasons that boil down to simple arithmetic. Eventually, Berkeley's Goodman estimates, a human brain must forge quadrillions of connections. But there are only 100,000 genes in human DNA. Even though half these genes--some 50,000--appear to be dedicated to constructing and maintaining the nervous system, he observes, that's not enough to specify more than a tiny fraction of the connections required by a fully functioning brain...