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Pontics

(Encyclopedia)Pontics, mountain system, N Turkey, extending c.700 mi (1,100 km) along the southern coast of the Black Sea. The Pontics generally increase in height from west to east, culminating in Kaçkar Daği (1...

Richardson, Sir Owen Willans

(Encyclopedia)Richardson, Sir Owen Willans, 1879–1959, British physicist, Ph.D. University College, London, 1904. He was a professor at Princeton from 1906 to 1913 and at King's College London from 1914 until his...

Papin, Denis

(Encyclopedia)Papin, Denis dənēˈ päpăNˈ [key], 1647–1712?, French physicist and inventor. He was an assistant of Christian Huygens and of Robert Boyle and was professor of mathematics at the Univ. of Marbur...

Stradella, Alessandro

(Encyclopedia)Stradella, Alessandro älĕs-sänˈdrō strädĕlˈlä [key], 1642?–1682, Italian composer of operas, cantatas, oratorios, and instrumental music. Few facts but many legends exist concerning his lif...

radioactive isotope

(Encyclopedia)radioactive isotope or radioisotope, natural or artificially created isotope of a chemical element having an unstable nucleus that decays, emitting alpha, beta, or gamma rays until stability is reache...

Marschall von Bieberstein, Adolf, Baron

(Encyclopedia)Marschall von Bieberstein, Adolf, Baron äˈdôlf märˈshäl fən bēˈbərshtīn [key], 1842–1912, German diplomat. After years in the administrative service of Baden and as a member of its legisl...

nail, in carpentry

(Encyclopedia)nail, metal pin driven by force applied at one end into pieces of material, usually wood, to join them together. The strength of a nailed joint depends on the properties of the wood, the type and numb...

papaverine

(Encyclopedia)papaverine pəpăvˈərēn [key], alkaloid found in opium that acts as a muscle relaxant and vasodilator. The drug relaxes the smooth muscle of the larger blood vessels and is used to increase the blo...

Hellenistic civilization

(Encyclopedia)Hellenistic civilization. The conquests of Alexander the Great spread Hellenism immediately over the Middle East and far into Asia. After his death in 323 b.c., the influence of Greek civilization con...

Lane, Franklin Knight

(Encyclopedia)Lane, Franklin Knight, 1864–1921, U.S. Secretary of the Interior (1913–20), b. near Charlottetown, P.E.I., Canada. Raised in California, he later studied law and practiced in San Francisco, where ...