Columbia Encyclopedia

Search results

500 results found

mesoderm

(Encyclopedia)mesoderm, in biology, middle layer of tissue formed in the gastrula stage of the developing embryo. At the end of the blastula stage, cells of the embryo are arranged in the form of a hollow ball. Con...

Mullis, Kary Banks

(Encyclopedia)Mullis, Kary Banks, 1944–2019, American biochemist, b. Lenoir, N.C., Ph.D. Univ. of California, Berkeley, 1972. Mullis was a researcher with Cetus Corp., Emeryville, Calif., from 1979 to 1986 and wi...

Commoner, Barry

(Encyclopedia)Commoner, Barry, 1917–2012, American biologist, educator, and activist, one of the founders of the modern environmental movement, b. Brooklyn, N.Y., grad. Columbia (B.A., 1937), Harvard (Ph.D., 1941...

Claude, Albert

(Encyclopedia)Claude, Albert älbârrˈ klōd [key], 1899–1983, Belgian biologist, b. Longlier, M.D., Univ. of Liège, 1928. He joined the Rockefeller Institute (now Rockefeller Univ.) in 1929 and spent his entir...

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...

carotene

(Encyclopedia)carotene kârˈətēnˌ [key], long-chained, unsaturated hydrocarbon found as a pigment in many higher plants, particularly carrots, sweet potatoes, and leafy vegetables. Carotene is thought to assist...

species

(Encyclopedia)species, in biology, a category of classification, the original and still the basic unit in the demarcation of plant and animal types. The species marks the boundary between populations of organisms r...

sperm

(Encyclopedia)sperm or spermatozoon spûrˌmətəzōˈən, –zōˈŏn [key], in biology, the male gamete (sex cell), corresponding to the female ovum in organisms that reproduce sexually. In higher animals the spe...

Kushiro

(Encyclopedia)Kushiro ko͞oshēˈrō [key], city (1990 pop. 205,640), SE Hokkaido, Japan, on the Pacific Ocean. The main port of E Hokkaido and the island's only ice-free trading port, it exports timber, fish, and ...

Beihai

(Encyclopedia)Beihai bäkˈhoiˈ [key], town (1994 est. pop. 135,500), Guangxi Zhuang Autonomous Region, SE China, an important fishing and trade port on the Gulf of Tonkin. Opened to foreign investment and trade i...