Word: nucleus
(lookup in dictionary)
(lookup stats)
Dates: all
Sort By: most recent first
(reverse)
...Pacifica, Calif., they called him "Father Bob"-or just plain Bob. He had come to the seaside community just south of San Francisco in 1966 as pastor of the airy, modern church that is the nucleus of St. Peter's Roman Catholic parish. He was a Vatican II priest, no question: folk Masses, a strong parish council, an adult education program on church history and theology. But he was a bit more as well. Last week the rest of the U.S. found out what some of his parishioners have known for months: that the pretty woman and five-year...
...biologists discovered a third kind of RNA?shortly after its existence had been theorized by Jacques Monod and François Jacob of France's Pasteur Institute. Called messenger RNA, it provided the missing piece in the molecular puzzle. It was formed on an uncoiled strip of DNA in the nucleus, imprinted with the particular "message" encoded in that portion?or gene?of the staircase, and then sent off with these instructions to the protein-making ribosomes...
...eventually be able to abandon sexual reproduction entirely. That startling and perhaps unwelcome possibility has been demonstrated by Dr. J.B. Gurdon of Britain's Oxford University. Taking an unfertilized egg cell from an African clawed frog, Gurdon destroyed its nucleus by ultraviolet radiation, replacing it with the nucleus of an intestinal cell from a tadpole of the same species. The egg, discovering that it had a full set of chromosomes, instead of the half set found in unfertilized eggs, responded by beginning to divide as if it had been normally fertilized. The result was a tadpole that was the genetic...
...CONCEPT IS not as farfetched as it sounds. Real viruses are merely segments of DNA (or RNA) surrounded by largely-protein sheaths; they penetrate the cell nucleus (leaving their sheaths behind) and take over the cellular...
Such fanciful fears tend to obscure deeper ethical and practical objections to cloning. The process could be used, for example, to allow a woman to produce a child without passing on her own or her mate's defective gene. A cell nucleus from the genetically sound parent could be substituted for the nucleus in her egg. But even that quite reasonable application could introduce a novel set of complications. Would the cloned child develop a sibling rivalry with its biological parent? Would he face a severe identity crisis, being someone else's "duplicate"? Beyond such considerations, a number of scientists...