Word: stranding
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Dates: during 1960-1969
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...with four off-the-shelf inert chemical compounds called nucleotides-the basic building block of the DNA molecule, which controls the hereditary characteristics of every living thing. To these they added one enzyme, DNA polymerase, that is known to promote the assembly of nucleotides into the typical helix-shaped strand that characterizes the DNA molecule, and another enzyme that closes the strand into a ring...
...protein sheath), they added it to the brew as a template, or blueprint, to guide the assembly of the synthetic molecule. Under the influence of the DNA polymerase enzyme, the four basic nucleotides aligned themselves in codelike combinations alongside the natural DNA molecule. Eventually they formed a strand consisting of about 6,000 nucleotide units that was a mirror image of the corresponding strand in the natural molecule. Then, using their mirror-image molecule as a template, they repeated the process to produce a precise but synthetic duplicate of the natural DNA molecule...
...want to turn now to another minority strand in the student body at the major law schools, namely, those who see the law as a way to serve society and perhaps even to change it. These young people, usually but not invariably from privileged backgrounds, seek careers which will call on their generosity more than their greed, their curiosity more than their memory, their wish to extend themselves rather than their wish for security. They hope that a law degree will open the possibility of an activist career at home or abroad. This is one of the reasons why they...
...Tails. X-ray studies reveal natural collagen as three strands of molecules twisted together like rope. The strands are short, and many have to be joined end to end to make up the body's long collagen fibers. Dr. Tomio Nishihara, a physical chemist who heads research for the Japan Leather Co., and Dr. Francis O. Schmitt of the Massachusetts Institute of Technology, thought there must be something on the ends of the basic molecules that enabled them to couple. Dr. Albert L. Rubin and an M.I.T. team set about testing the theory. They found that each collagen strand...
Traditional Chinese rhetoric is eminently suited to making war by poster. It is full of the exaggeration and hyperbole typified by the 8th century Chinese poet Li Po's description of a bearded sage as "a man with a strand of hair 3,000 yards long." In the same vein, Red Guard posters have blithely advocated that Mao's enemies be "burned at the stake," recounted tongues and ears being torn off in street fighting and reviled Mrs. Liu Shao-chi one week as a "common prostitute" and the next, somewhat bewilderingly, as "priggish...