Columbia Encyclopedia

Search results

458 results found

Magnus, Heinrich Gustav

(Encyclopedia)Magnus, Heinrich Gustav hīnˈrĭkh go͝osˈtäf mägˈno͝os [key], 1802–70, German chemist, physicist, and educator. In 1831 he became lecturer and in 1834 professor of physics and technology at t...

emetic

(Encyclopedia)emetic əmĕtˈĭk [key], substance that produces vomiting. Direct, or gastric, emetics, which act directly on the stomach, include syrup of ipecac, sulfate of zinc or copper, alum, ammonium carbonate...

Porter, Rodney Robert

(Encyclopedia)Porter, Rodney Robert, 1917–85, British biochemist, Ph.D. Cambridge, 1948. He was a researcher at the National Institute of Medical Research, England (1949–1960), and a professor at St. Mary's Hos...

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...

Okinawa

(Encyclopedia)Okinawa ōˌkĭnäˈwä [key], island (1990 pop. 1,222,458), 454 sq mi (1,176 sq km), W Pacific Ocean, SW of Kyushu; a part of Okinawa prefecture, Japan. It is the largest of the Okinawa Islands in th...

alkali

(Encyclopedia)alkali ălˈkəlī [key] [Arab., al-gili=ashes of saltwort], hydroxide of an alkali metal. Alkalies are readily soluble in water and form strongly basic solutions with a characteristic acrid taste. Th...

Scheele, Karl Wilhelm

(Encyclopedia)Scheele, Karl Wilhelm kärl vĭlˈhĕlm shāˈlə [key], 1742–86, Swedish chemist, b. Stralsund. He is known as the discoverer of many chemical substances. He was a pharmacist in Stockholm, in Uppsa...

soapstone

(Encyclopedia)soapstone or steatite stēˈətīt [key], metamorphic rock of which the characteristic and usually chief mineral is talc, but which also contains varying parts of chlorite, mica, tremolite, quartz, ma...

toluene

(Encyclopedia)toluene mĕthˌəlbĕnˈzēn [key], C7H8, colorless liquid aromatic hydrocarbon that melts at −95℃ and boils at 110.8℃. It is insoluble in water but highly soluble in most organic solvents. Tolu...

Walker, Sir John Ernest

(Encyclopedia)Walker, Sir John Ernest, 1941–, English biochemist, Ph.D. Oxford, 1969. He has been a researcher at the Medical Research Council Laboratory of Molecular Biology in Cambridge since 1974. In 1997 Walk...