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Ponca

(Encyclopedia)Ponca, Native North Americans whose language belongs to the Siouan branch of the Hokan-Siouan linguistic stock (see Native American languages). According to tradition the group lived in the Ohio valle...

phospholipid

(Encyclopedia)phospholipid fŏsˌfōlĭpˈĭd [key], lipid that in its simplest form is composed of glycerol bonded to two fatty acids and a phosphate group. The resulting compound called phosphatidic acid contains...

Tristan da Cunha

(Encyclopedia)Tristan da Cunha trĭsˈtăn də ko͞oˈnə [key], group of volcanic islands in the S Atlantic, about midway between S Africa and S America, part of the British Saint Helena overseas territory. The on...

Lyakhov Islands

(Encyclopedia)Lyakhov Islands lyäˈkhəf [key], c.2,700 sq mi (7,000 sq km), southern group of the New Siberian Islands, N Siberian Russia, between the Laptev Sea and the East Siberian Sea, Sakha Republic. They in...

Dahlak Archipelago

(Encyclopedia)Dahlak Archipelago däläkˈ ärkĭpĕlˈəgō [key], island group, Eritrea, in the Red Sea off Massawa. There are two large, inhabited islands and more than 200 small, largely uninhabited islands. Th...

Volcano Islands

(Encyclopedia)Volcano Islands, Jap. Kazan-retto, island group, c.11 sq mi (30 sq km), W Pacific. The group consists of three islands, of which Iwo Jima (Iwo To) is the most important. The highest peak (3,181 ft/970...

Bridges, Calvin Blackman

(Encyclopedia)Bridges, Calvin Blackman, 1889–1938, American geneticist, b. Schuyler Falls, N.Y., grad. Columbia (B.S., 1912; Ph.D., 1916). In his research he collaborated with T. H. Morgan, A. H. Sturtevant, and ...

watershed

(Encyclopedia)watershed, elevation or divide separating the catchment area, or drainage basin, of one river system or group of river systems from another system or group of systems. The term is also often used syno...

Antifa

(Encyclopedia)Antifa, American political movement, is a loose coalition of progressive voices opposing the rise of homophobic, authoritarian, xenophobic, and racist movements worldwide. Inspired by the ...

aldehyde

(Encyclopedia)CE5 Aldehydes aldehyde ălˈdəhīd [key] [alcohol + New Lat. dehydrogenatus=dehydrogenated], any of a class of organic compounds that contain the carbonyl group, >C=-->O, and in which t...