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Warner, Mark Robert

(Encyclopedia)Warner, Mark Robert, 1954–, U.S. politician, b. Indianapolis, grad George Washington Univ. (B.A., 1977), Harvard Law School (J.D., 1980). After settling in Virginia and working as a congressional st...

Zuckerberg, Mark Elliot

(Encyclopedia)Zuckerberg, Mark Elliot, 1984–, American computer programmer and business executive, b. Dobbs Ferry, N.Y. A computer prodigy as a child, he entered Harvard in 2002 and two years later co-founded The...

Van Doren, Mark

(Encyclopedia)Van Doren, Mark 1894–1973, American poet and critic, b. Hope, Vermilion co., Ill., Ph.D. Columbia, 1920; brother of Carl Van Doren. He taught English at Columbia (1920–59), where he was a renowned...

Hopkins, Mark, American educator

(Encyclopedia)Hopkins, Mark, 1802–87, American educator, b. Stockbridge, Mass., grad. Williams, 1824, and Berkshire Medical School, 1829. After a few months of medical practice he returned (1830) to Williams as p...

Hopkins, Mark, American railroad builder and merchant

(Encyclopedia)Hopkins, Mark, 1813–78, American railroad builder and merchant, b. Henderson, N.Y. A clerk in a village store and later a commission merchant in New York City, he was more than 35 years old when he ...

polymerase chain reaction

(Encyclopedia)polymerase chain reaction pŏlˈĭmərāsˌ [key] (PCR), laboratory process in which a particular DNA segment from a mixture of DNA chains is rapidly replicated, producing a large, readily analyzed sa...

nucleic acid

(Encyclopedia)CE5 Replication of strands of DNA CE5 nucleic acid, any of a group of organic substances found in the chromosomes of living cells and viruses that play a central role in the storage and replica...

Coronado

(Encyclopedia)Coronado kŏrˌənäˈdō [key], city (2020 pop. 20,192), San Diego co., S Calif., on a peninsula on ...

vascular bundle

(Encyclopedia)vascular bundle, in botany, a strand of conducting tissue extending lengthwise through the stems and roots of higher plants, including the ferns, fern allies, gymnosperms, and angiosperms. The vascula...

hallmark

(Encyclopedia)hallmark, mark impressed on silverwork or goldwork to signify official approval of the standard of purity of the metal, also called plate mark. The hallmark was introduced by statute in England in 130...