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Zewail, Ahmed Hassan

(Encyclopedia)Zewail, Ahmed Hassan, 1946–2016, Egyptian-American chemist, b. Damanhur, Egypt, Ph.D. Univ. of Pennsylvania, 1974. He became a U.S. citizen in 1982. A professor at the California Institute of Techno...

endangered species

(Encyclopedia)endangered species, any plant or animal species whose ability to survive and reproduce has been jeopardized by human activities. In 1999 the U.S. government, in accordance with the U.S. Endangered Spe...

Gide, André

(Encyclopedia)Gide, André äNdrāˈ zhēd [key], 1869–1951, French writer. He established a reputation as an unconventional novelist with The Immoralist (1902, tr. 1930), a partly autobiographical work in which ...

chemical warfare

(Encyclopedia)chemical warfare, employment in war of incendiaries, poison gases, and other chemical substances. Ancient armies attacking or defending fortified cities threw burning oil and fireballs. A primitive ty...

Field Museum of Natural History

(Encyclopedia)Field Museum of Natural History, in Chicago, Ill. Founded in 1893 through the gifts of Marshall Field and others, it was first known as the Columbian Museum of Chicago and in 1905 was renamed in honor...

Huxley, Thomas Henry

(Encyclopedia)Huxley, Thomas Henry, 1825–95, English biologist and educator, grad. Charing Cross Hospital, 1845. Huxley gave up his own biological research to become an influential scientific publicist and was th...

Palade, George Emil

(Encyclopedia)Palade, George Emil päläˈdē [key], 1912–2008, American cell biologist, b. Iaşi, Romania, M.D. Univ. of Bucharest, 1940. He was a faculty member at the Rockefeller Institute (now Rockefeller Uni...

Salk, Jonas Edward

(Encyclopedia)Salk, Jonas Edward, 1914–95, American physician and microbiologist, b. New York City, B.S. College of the City of New York, 1934, M.D. New York Univ. College of Medicine, 1939. He did research on th...

Rockefeller University

(Encyclopedia)Rockefeller University, philanthropic organization in New York City, founded 1901 as the Rockefeller Institute for Medical Research by John D. Rockefeller for furthering medical science and its allied...

aromatic compound

(Encyclopedia)aromatic compound, any of a large class of compounds that includes benzene and compounds that resemble benzene in certain of their chemical properties. Originally applied to a small class of pleasant-...