Columbia Encyclopedia

Search results

384 results found

Spitz, Mark Andrew

(Encyclopedia)Spitz, Mark Andrew, 1950–, American swimmer, b. Modesto, Calif. He held records for winning the most gold medals at one Olympic game (seven, in 1972 at Munich) and shared the record for most Olympic...

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...

Mark, Gospel according to

(Encyclopedia)Mark, Gospel according to, 2d book of the New Testament. The shortest of the four Gospels and probably the earliest, it is usually thought to have been composed shortly before the destruction of the T...

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...

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...

Myrtle Beach

(Encyclopedia)Myrtle Beach, resort city (2007 est. pop. 29,970), NE S.C., inc. 1938 as a town, 1957 as a city. Situated on the Grand Strand, a 60-mi (95-km) stretch of beach between the Atlantic Ocean and the Intra...