Word: molecular
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...conduct the life-or-death evolutionary struggle. This gene-based view of life is compatible with a finding made independently by researchers in a widely divergent branch of science. Rutgers Biochemist George Pieczenik has discovered patterns in DNA coding that he sees as evidence of selection occurring at the molecular level (TIME, April 4). "What this means," he says, "is that the DNA sequences exist to protect themselves and their own information. It's not the organism that counts. The DNA sequences don't really care if they have to look like a lowly assistant professor or a giraffe...
...available. Instead, they experimented with insulin genes from rats. Placing this foreign DNA inside enfeebled E. coli, they were delighted to find that the genetic material was replicated every time the bacteria divided. But the scientists do not yet know whether the rat genes -in the language of molecular biology -actually expressed themselves, that is, produced insulin...
Like a chant throughout the book, Grace, in her methodical analytical way states, "We all remember what we need to remember." Even empirical evidence--"Give me the molecular structure of the protein which defined Charlotte Douglas," she demands at the book's beginning--is subject to the internal mechanism in each person which attempts to make life more palatable, spoon-feeding it to us bit by bit, memory by memory. The repeated staccato phrases throughout A Book of Common Prayer, like the responsive readings in a hymn book, form the kernels of the emerging past for Charlotte. Like a slightly...
...fluid of cows and serum from fetal calves. In effect, the formula fooled the parasite into acting as if it were in a natural host. Yet trypanosomes are exasperatingly fickle creatures. After they invade humans or cattle, they show a chameleon-like ability to change their protein coatings, whose molecular structure serves as a precise signal to the host's immune system for the production of specific antibodies against the invaders. As the immune system begins mustering appropriately shaped antibodies against the trypanosomes, the parasites change their coats and force the immune system to mount a new counterattack. This...
...along with the impending federal legislation, which is expected to impose restraints on all researchers-including those at previously unregulated industry labs. Still, scientists remain concerned over any political controls on their work. At last week's Senate hearing, these fears were voiced by Norton Zinder, a molecular geneticist at Rockefeller University. Said he: "We are moving into a precedent-making area -the regulation of an area of scientific research-and I must plead that this be done with extreme care and without haste. The record of past attempts of authoritative bodies, either church or state, to control intellectual...