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dermatitis

(Encyclopedia)dermatitis dûrˌmətīˈtĭs [key], nonspecific irritation of the skin. The causative agent may be a bacterium, fungus, or parasite; it can also be a foreign substance, known as an allergen. Contact ...

Collot d'Herbois, Jean Marie

(Encyclopedia)Collot d'Herbois, Jean Marie zhäN märēˈ kōlōˈ dĕrbwäˈ [key], 1750–96, French revolutionary, originally an actor and playwright. Although a member of his Jacobin club, he favored a constitu...

amphoterism

(Encyclopedia)amphoterism ămˌfətĕrˈĭzm [key], in chemistry, the property of certain substances of acting either as acids or as bases depending on the reaction in which they are involved. Many hydroxide compou...

Strachey, Lytton

(Encyclopedia)Strachey, Lytton (Giles Lytton Strachey), 1880–1932, English biographer and critic, educated at Cambridge. He was one of the leading members of the Bloomsbury group. Strachey is credited with having...

Boleslaus II

(Encyclopedia)Boleslaus II, c.1039–1081, duke (1058–76), and later king (1076–79) of Poland; son and successor of Casimir I. Throughout his reign he opposed the influence of the Holy Roman Empire. He asserted...

realism, in art

(Encyclopedia)realism, in art, the movement of the mid-19th cent. formed in reaction against the severely academic production of the French school. Realist painters sought to portray what they saw without idealizin...

oxygen

(Encyclopedia)oxygen, gaseous chemical element; symbol O; at. no. 8; interval in which at. wt. ranges 15.99903–15.99977; m.p. −218.4℃; b.p. −182.962℃; density 1.429 grams per liter at STP; valence −2. T...

Detroit, river, United States and Canada

(Encyclopedia)Detroit, river, 32 mi (52 km) long, flowing from Lake St. Clair S into Lake Erie between Detroit, Mich., and Windsor, Ont.; it forms part of the U.S.-Canada boundary. It is one of the most heavily ind...

columbium

(Encyclopedia)columbium kəlŭmˈbēəm [key], symbol Cb, former name of the chemical element niobium. ...

Marsh, James

(Encyclopedia)Marsh, James, 1789–1846, English chemist. He is known for his chemical test for arsenic and antimony, called the Marsh test. Using it, very small quantities of arsenic can be detected. ...