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limestone

(Encyclopedia)limestone, sedimentary rock wholly or in large part composed of calcium carbonate. It is ordinarily white but may be colored by impurities, iron oxide making it brown, yellow, or red and carbon making...

loess

(Encyclopedia)loess lĕs, lōˈəs, Ger. lös [key], unstratified soil deposit of varying thickness, usually yellowish and composed of fine-grained angular mineral particles mixed with clay. It is found in many reg...

Waksman, Selman Abraham

(Encyclopedia)Waksman, Selman Abraham wäksˈmən [key], 1888–1973, American microbiologist, b. Priluka, Russia, grad. Rutgers (B.S. 1915), Ph.D. Univ. of California, 1918. He went to the United States in 1910 an...

threonine

(Encyclopedia)CE5 threonine thrēˈənēn [key], organic compound, one of the 22 α-amino acids commonly found in animal proteins. Only the l-stereoisomer appears in mammalian protein. It is one of several essen...

physical chemistry

(Encyclopedia)physical chemistry, branch of science that combines the principles and methods of physics and chemistry. It provides a fundamental theoretical and experimental basis for all of chemistry, including or...

protoplasm

(Encyclopedia)protoplasm, term once used for the fundamental material of which all living things were thought to be composed. It was studied by a number of early scientists, especially by Félix Dujardin, J. E. Pur...

picric acid

(Encyclopedia)picric acid trīˌnīˌtrōfēˈnōl [key], C6H2(NO2)3OH, a toxic yellow crystalline solid that melts at 122℃ and is soluble in most organic solvents. Picric acid is a derivative of phenol. It react...

Viollet-le-Duc, Eugène Emmanuel

(Encyclopedia)Viollet-le-Duc, Eugène Emmanuel özhĕnˈ ĕmänüĕlˈ vyôlāˈ-lə-dük [key], 1814–79, French architect and writer. He was the most prominent exponent of the Gothic revival in France, and was i...

Datia

(Encyclopedia)Datia dŭˈtēä [key], town, Madhya Pradesh state, N central India. It is a district adminis...

Chofu

(Encyclopedia)Chofu chōˈfo͞o [key], city, Tokyo Metropolis, E central Honshu, Japan, on the Tuma River. ...