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Wittig, Georg

(Encyclopedia)Wittig, Georg, 1897–1987, German chemist, Ph.D. Univ. of Marburg, 1926. During his career, Wittig was a professor at the universities of Braunschweig, Freiburg, Tübingen, and Heidelberg. He shared ...

atomic mass unit

(Encyclopedia)atomic mass unit or amu, in chemistry and physics, unit defined as exactly 1⁄12 the mass of an atom of carbon-12, the isotope of carbon with six protons and six neutrons in its nucleus. One amu is e...

Poggendorff, Johann Christian

(Encyclopedia)Poggendorff, Johann Christian yōˈhän krĭsˈtyän pôgˈəndôrfˌ [key], 1796–1877, German physicist and chemist. He founded (1824) and edited the important Annalen der Physik und Chemie and edi...

Pregl, Fritz

(Encyclopedia)Pregl, Fritz frĭts prāˈgəl [key], 1869–1930, Austrian physiologist and chemist, M.D. Univ. of Graz, 1894. He taught at the universities of Innsbruck (1910–13) and Graz (from 1913). For his met...

Salamanca, University of

(Encyclopedia)Salamanca, University of, at Salamanca, Spain; founded 1218 by Alfonso IX of León, reorganized 1254 by Alfonso X of Castile and León. It has faculties of philosophy, philology, geography and history...

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...

Central Valley

(Encyclopedia)Central Valley, great trough of central Calif., c.450 mi (720 km) long and c.50 mi (80 km) wide, between the Sierra Nevada and the Coast Ranges. The Sacramento and San Joaquin rivers drain much of the...

Duncan, Robert Kennedy

(Encyclopedia)Duncan, Robert Kennedy, 1868–1914, American industrial chemist and educator b. Brantford, Ont., grad. Univ. of Toronto (B.A., 1892). He was professor at the Univ. of Kansas (1906–10) and at the Un...

Glauber, Johann Rudolf

(Encyclopedia)Glauber, Johann Rudolf yōˈhän ro͞oˈdôlf glouˈbər [key], 1604–70, German alchemist. A forerunner of scientific chemists, Glauber made many practical advances in analytical chemistry; he devis...

Kossel, Albrecht

(Encyclopedia)Kossel, Albrecht älˈbrĕkht kôsˈəl [key], 1853–1927, German physiologist. He was professor at Heidelberg from 1901. He specialized in the physiological chemistry of the cell and its nucleus and...