Word: nucleus
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Cholesterol is a steroid, one of a huge and diverse class of chemicals-including many fatty substances and most adrenal and sex hormones-having one thing in common: a four-ring cluster of carbon atoms, known as "the steroid nucleus." Other attached atoms give each steroid its distinctive character (see diagram). By growing rat-liver cells in the test tube, Dr. Bloch learned that they make cholesterol from the much simpler acetate ion (acetic acid minus a hydrogen ion). "My work since then," he says, "has been on the processes that the cell uses to manufacture the cholesterol molecule. This...
Promoted to assistant professors of Physics are Louis N. Hand, who has investigated the properties of the nucleus revealed by electron scattering, and Joseph L. Snider, who has done research on the magnetic properties of the nitrogen nucleus. Hand, an Instructor since 1962, holds the B.A. (1955) from Swarthmore and the Ph.D. (1962) from Stanford. Snider, an instructor since 1961, holds the B.A. (1956) from Amherst and the Ph.D. (1961) from Princeton...
...agree to put in," he said, "should, in an emergency, be available in the common interest, unimpaired by the possibility of a last-minute veto by one or another of the nuclear powers." At the heart of Norstad's plan is the creation of an executive committee whose nucleus would be the Big Three. In this respect, the plan is reminiscent of Charles de Gaulle's longstanding-and long-rebuffed-demand for a U.S.-British-French triumvirate to direct NATO. But Norstad adds that the committee he envisions would be "open to all powers whenever their interests...
...faith in the people he pays, Tshombe wanted to hire mercenaries from the start. And, secretly, he did so. Fully aware that the Congolese army was wholly untrustworthy and that his nationalist African neighbors were unlikely to send him even token support, the smiling little Premier imported the nucleus of his mercenary command six weeks ago, less than two weeks after he took office...
Cognac for Breakfast. The line now covers 12 countries in the Middle East, has also extended its routes beyond the Arab countries to London and Paris, Liberia and the Ivory Coast and east to India and Pakistan. Eventually, Alamuddin hopes, it will become the nucleus of a Pan-Arab airline. It carries 350,000 passengers annually, has helped to push