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Daniel Nathans
Daniel Nathans 1928-99, American microbiologist, b. Wilmington, Del., M.D. Washington Univ., St. Louis, 1954. He became a professor at Johns Hopkins Univ. in 1962. Nathans worked with Werner Arber and Hamilton Othanel Smith in studying the nature of genes. The trio discovered and used biochemic...
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homily
homily , type of oral religious instruction delivered to a church congregation. In the patristic period through the Middle Ages the focus of the homily was on the explanation and application of texts read or sung during the celebration of the liturgy. Works of literature giving moral advice are also...
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personal digital assistant
personal digital assistant (PDA), lightweight, hand-held computer designed for use as a personal organizer with communications capabilities; also called a handheld. A typical PDA has no keyboard, relying instead on special hardware and pen-based computer software to enable the recognition of ha...
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Ohm's law
Ohm's law [for G. S. Ohm ], law stating that the electric current i flowing through a given resistance r is equal to the applied voltage v divided by the resistance, or i = v / r. For general application to alternating-current circuits where inductances and capacitances as well as resistan...
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speleology
speleology , systematic exploration of caves , popularly called spelunking. It includes the measuring and mapping of caves and reporting on the flora and fauna found in them. One application of speleology is the tracing of the movement of underground waters to prevent water pollution.
Bibliog...
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Johannes Georg Bednorz
Johannes Georg Bednorz , 1950-, German physicist. After earning his doctorate from the Swiss Federal Institute of Technology, he began (1982) work at the IBM Zürich Research Laboratory with Karl Alex Müller . In 1983 they discovered superconductivity in a ceramic fragment at temperatures ...
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Donald James Cram
Donald James Cram 1919-2001, American chemist, b. Chester, Vt., Ph.D. Harvard, 1947. A professor at the Univ. of California at Los Angeles, Cram expanded on the work of Charles J. Pedersen by synthesizing three-dimensional molecules that could mimic the functioning of natural molecules. With Pede...
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Norman Foster Ramsey
Norman Foster Ramsey 1915-, American physicist, b. Washington, D.C., Ph.D. Columbia Univ., 1940. A physics professor at Harvard after 1950, Ramsey also held several posts with such government and international agencies as NATO and the U.S. Atomic Energy Commission. He was awarded the 1989 Nobel Pri...
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Vladimir Kosma Zworykin
Vladimir Kosma Zworykin , 1889-1982, American physicist, b. Russia, educated in Russia, at the Collège de France, and at the Univ. of Pittsburgh (Ph.D., 1926). He became an American citizen in 1924. On the staff of the Radio Corp. of America after 1929, he became vice president and technical ...
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lever
lever simple machine consisting of a bar supported at some stationary point along its length and used to overcome resistance at a second point by application of force at a third point. The stationary point of a lever is known as its fulcrum. The term lever is also applied to a projecting piece ...
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