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episome

(Encyclopedia)episome ĕpˈĭsōm [key], unit of genetic material composed of a series of genes that sometimes has an independent existence in a host cell and at other times is integrated into a chromosome of the c...

Johnson, Richard Mentor

(Encyclopedia)Johnson, Richard Mentor, 1780–1850, Vice President of the United States (1837–41), b. Kentucky, on the site of present Louisville. Admitted (1802) to the bar, he became prominent in state politics...

Maxim

(Encyclopedia)Maxim măkˈsĭm [key], name of a family of inventors and munition makers. Sir Hiram Stevens Maxim, 1840–1916, was born near Sangerville, Maine. After launching on a career of inventing, he moved to...

acetaminophen

(Encyclopedia)acetaminophen əsētˌəmĭnˈəfĭn [key], an analgesic and fever-reducing medicine. It is an active ingredient in many over-the-counter medicines, including Tylenol and Midol. Introduced in the earl...

Murad, Ferid

(Encyclopedia)Murad, Ferid, 1936–, American pharmacologist, b. Whiting, Ind., M.D., Ph.D. Western Reserve Univ. (now Case Western Reserve Univ.), 1965. Murad taught at the Univ. of Virginia (1975–81), Stanford ...

Murnane, Gerald

(Encyclopedia)Murnane, Gerald, 1939–, Australian writer, B.A. Univ. of Melbourne, 1969. His first two novels, Tamarisk Row (1974) and A Lifetime on Clouds (1976), are semiautobiographical recollections of his ear...

myosin

(Encyclopedia)myosin mīˈəsĭn [key], one of the two major protein constituents responsible for contraction of muscle. In muscle cells myosin is arranged in long filaments called thick filaments that lie parallel...

nitrocellulose

(Encyclopedia)nitrocellulose, nitric acid ester of cellulose (a glucose polymer). It is usually formed by the action of a mixture of nitric and sulfuric acids on purified cotton or wood pulp. The extent of nitratio...

Parks, Gordon

(Encyclopedia)Parks, Gordon (Gordon Roger Alexander Buchanan Parks), 1912–2006, African-American photographer, filmmaker, writer, and composer, b. Fort Scott, Kans. Parks purchased his first camera in 1938 and be...

Penn, Sir William, British admiral

(Encyclopedia)Penn, Sir William, 1621–70, British admiral. In the English civil war he served in Parliament's naval forces, and he joined the pursuit (1651–52) of Prince Rupert in the Mediterranean. He served i...