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Nestor, Russian chronicler

(Encyclopedia)Nestor nĕsˈtər [key], d. 1115?, Russian chronicler. A monk in a Kiev monastery, he wrote a life of saints Boris and Gleb and of the prior of his monastery St. Feodosi. Until recently the authorship...

Caldwell, Sarah

(Encyclopedia)Caldwell, Sarah, 1924–2006, American opera director and conductor, b. Maryville, Mo. In 1957 she founded the Boston Opera Group, later renamed the Opera Company of Boston, and headed it until its de...

Richter, Hans

(Encyclopedia)Richter, Hans rĭkhˈtər [key], 1888–1976, American artist, b. Germany. A painter and filmmaker, Richter was influenced by cubism and Dada and was a member of the Dutch de Stijl group (see Stijl, ...

critical mass

(Encyclopedia)critical mass: see chain reaction. ...

tautomer

(Encyclopedia)tautomer tôˈtəmər [key], one of two or more structural isomers that exist in equilibrium and are readily converted from one isomeric form to another. Of the various types of tautomerism that are p...

Tomsk

(Encyclopedia)Tomsk tŏmsk, Rus. tômsk [key], city (1989 pop. 502,000), capital of Tomsk region, W central Siberian Russia, on the Tom River. It is a major river port and freight transit point, and is a regional h...

Pinza, Ezio

(Encyclopedia)Pinza, Ezio ātsˈyō pēnˈtsä [key], 1892–1957, Italian bass, b. Rome, studied at the Bologna Conservatory. After military service (1915–19), he resumed his operatic career in Rome, later singi...

phosphorylation

(Encyclopedia)phosphorylation, chemical process in which a phosphate group is added to an organic molecule. In living cells phosphorylation is associated with respiration, which takes place in the cell's mitochondr...

Davos

(Encyclopedia)Davos dävôsˈ [key], town, Grisons canton, E Switzerland, on the Landwasser River. A famous...

Roux, Wilhelm

(Encyclopedia)Roux, Wilhelm ro͞o [key], 1850–1924, German anatomist, a founder of experimental embryology. He was a pupil of Ernst Haeckel and a professor (1895–1921) at the Univ. of Halle. In his studies of ...