- Cram, Donald by Andre Rhodes
... 1919– ) chemist; born in Chester, Vt. He became affiliated with the University of California: Los Angeles in 1947. He elucidated mechanisms of molecular recognition, working most notably on the properties of crown ether molecules. He shared the Nobel Prize in chemistry (1987) for this work.
- Drake, Charles by Eva Meyer
... 1924– ) geophysicist; born in Ridgewood, N.J. He taught at Columbia University (1955–65) before joining Dartmouth College (1967). He elucidated the impact of geosciences on critical energy resources, and advanced the study of plate tectonics with research on the earth's continental margins, crust, and upper mantle.
- Predicate Calculus by Great Soviet Encyclopedia
... branch of mathematical logic—an aggregate of logical and mathematical calculi that formalize those branches of modern logic in which the rules of operating with quantifiers are elucidated and studied (in connection with the examination of the subject-predicate structure of propositions).
- Pillsbury, John E. by Aidan Jimenez
... 1908) who retired as a rear admiral. An authority on naval hydrography and geodesy, he determined the axis of the Gulf Stream in the Straits of Florida and off Cape Hatteras, and elucidated the geophysical laws regulating this current's flow.
- Playfair, John by Connor Morgan
... Theory of the Earth. (1802) elucidated the methods and principles of his friend James Hutton and established uniformitarianism as the foundation of the new science of geology. He also published texts on geometry, physics, and astronomy.