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citric acid

(Encyclopedia)citric acid or 2-hydroxy-1,2,3-propanetricarboxylic acid, HO2CCH2C(OH)(CO2H)CH2CO2H, an organic carboxylic acid containing three carboxyl groups; it is a solid at room temperature, melts at 153℃, an...

Chukchi Peninsula

(Encyclopedia)Chukchi Peninsula cho͞okˈchē [key], northeastern extremity of Asia, terminating in Cape Dezhnev, Russian Far East. Washed by the E Siberian and Chukchi seas in the northeast, the peninsula is the e...

mustard gas

(Encyclopedia)mustard gas, chemical compound used as a poison gas in World War I. The burning sensation it causes on contact with the skin is similar to that caused by oil from black mustard seeds. The compound is ...

Li Tzu-cheng

(Encyclopedia)Li Tzu-cheng lē dzo͞o-chŭng [key], 1605–45, Chinese rebel leader who contributed to the fall of the Ming dynasty. With the help of scholars he organized a government in S Shanxi prov., proclaimed...

Herzberg, Gerhard

(Encyclopedia)Herzberg, Gerhard gĕrˈhärt hûrtsˈbûrg [key], 1904–99, Canadian physicist, b. Hamburg, Germany. He studied at Darmstadt, Göttingen, and Bristol, England, receiving a doctorate in engineering p...

martial arts

(Encyclopedia)martial arts, various forms of self-defense, usually weaponless, based on techniques developed in ancient China, India, and Tibet. In modern times they have come into wide use for self-protection, as ...

silicone

(Encyclopedia)silicone, polymer in which atoms of silicon and oxygen alternate in a chain; various organic radicals, such as the methyl group, CH3, are bound to the silicon atoms. Silicones, which are unusually sta...

Tseng Kuo-fan

(Encyclopedia)Tseng Kuo-fan dzŭng gwô-fän [key], 1811–72, Chinese general and statesman of the Ch'ing dynasty. He organized (1853) the Hunan army, the first of the great regional armies that were raised to sup...

ethylene

(Encyclopedia)ethylene ĕthˈēn [key], H2C=CH2, a gaseous unsaturated hydrocarbon. It is the simplest alkene. Ethylene is colorless, has a faint odor, and has a slightly sweet taste; it melts at −169.4℃ and bo...

Black, Sir James Whyte

(Encyclopedia)Black, Sir James Whyte, 1924–2010, Scottish pharmacologist, M.B., Ch.B. Univ. of St. Andrews, 1946. A drug researcher, he held a series of posts with universities and drug companies before serving a...