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Semyonov, Nikolay Nikolayevich

(Encyclopedia)Semyonov, Nikolay Nikolayevich, or Nikolai Nikolaevic Semenov, 1896–1986, Soviet physical chemist, Ph.D. Petrograd Univ., 1917. Semyonov was a professor at the Leningrad Physico-Technical Institute ...

Shmyhal, Denys Anatoliyovych

(Encyclopedia)Shmyhal or Shmygal, Denys Anatoliyovych, 1975–, Ukrainian politician. An engineer and economist, he worked in the private sector (1995–2009), then served in the state administration for Lviv Oblas...

Puyehue–Cordón Caulle

(Encyclopedia)Puyehue–Cordón Caulle, volcanic complex, SE Chile, in the Andes Mts. within Puyehue National Park. The volcanic chain comprises (NW to SE) the Cordillera Nevada caldera (5,902 ft/1,799 m high), the...

polybrominated biphenyl

(Encyclopedia)polybrominated biphenyl or PBB, any of a group of organic compounds used as a fire retardant. In 1973 several thousand pounds of PBB were accidentally mixed with livestock feed that was later distribu...

histidine

(Encyclopedia)CE5 histidine hĭsˈtĭdēn [key], organic compound, one of the 22 α-amino acids commonly found in animal proteins. Only the l-stereoisomer appears in mammalian protein. Histidine is the direct pr...

Bernhard of Saxe-Weimar

(Encyclopedia)Bernhard of Saxe-Weimar săksˈ–wīˈmär, zäksˈə-vīˈmär [key], 1604–39, Protestant general in the Thirty Years War, duke of Weimar. Under Ernst von Mansfeld and the margrave of Baden, Bernh...

Enewetak

(Encyclopedia)Enewetak, Enewetok, or Eniwetok ĕnĭwēˈtŏk, ĕnēˈwĕtôk [key], circular atoll, central Pacific, one of the Ralik Chain in the Marshall Islands. Enewetak is c.50 mi (80 km) in circumference and...

Hahn, Otto

(Encyclopedia)Hahn, Otto ôˈtō hän [key], 1879–1968, German chemist and physicist. His important contributions in the field of radioactivity include the discovery of several radioactive substances, the develop...

Florida Keys

(Encyclopedia)Florida Keys, chain of coral and limestone islands and reefs, c.150 mi (240 km) long, extending from Virginia Key, S of Miami Beach, to Key West, and forming the southern extremity of Florida. Between...

laburnum

(Encyclopedia)laburnum ləbûrˈnəm [key] or golden chain, small tree (Laburnum anagyroides) of the family Leguminosae (pulse family) with decorative dark green leaves and sprays of bright yellow flowers. It is na...