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Wöhler, Friedrich
(Encyclopedia) Wöhler, FriedrichWöhler, Friedrichfrēˈdrĭkh vöˈlər [key], 1800–1882, German chemist. He studied under the German chemist Leopold Gmelin and J. J. Berzelius, a Swedish chemist, and in…Grignard reagent
(Encyclopedia) Grignard reagentGrignard reagentgrēnyärdˈ rēāˈjənt [key], any of an important class of extremely reactive chemical compounds used in the synthesis of hydrocarbons, alcohols, carboxylic…Gerhardt, Charles Frédéric
(Encyclopedia) Gerhardt, Charles FrédéricGerhardt, Charles Frédéricshärl frādārēkˈ zhārärˈ [key], 1816–56, French chemist, b. Strasbourg. He revived the theory of acid radicals, which he called the…Liebig, Justus, Baron von
(Encyclopedia) Liebig, Justus, Baron vonLiebig, Justus, Baron vony&oobreve;sˈt&oobreve;s bärônˈ fən lēˈbĭkh [key], 1803–73, German chemist. As professor at Giessen (1824–52), he was among the…chelating agents
(Encyclopedia) chelating agentschelating agentskēˈlātĭng [key]. Certain organic compounds are capable of forming coordinate bonds (see chemical bond) with metals through two or more atoms of the…speech defect
(Encyclopedia) speech defect, any condition that interferes with the mental formation of words or their physical production. Speech defects in children generally become apparent in the early school…Brown, Herbert Charles
(Encyclopedia) Brown, Herbert Charles, 1912–2004, American chemist, b. London, Ph.D. Univ. of Chicago, 1938. A professor at Wayne State Univ. (1943–47) and Purdue Univ. (1947–78), he shared the 1979…autotroph
(Encyclopedia) autotrophautotrophôtˈətrōfˌ [key], in biology, an organism capable of synthesizing its own organic substances from inorganic compounds. Autotrophs produce their own sugars, lipids, and…Fischer, Hans
(Encyclopedia) Fischer, Hans, 1881–1945, German organic chemist, Ph.D. Univ. of Marburg, 1904; M.D. Univ. of Munich, 1908. Fischer was a professor at the Univ. of Innsbruck from 1916 to 1918 and at…soil
(Encyclopedia) soil, surface layer of the earth, composed of fine rock material disintegrated by geological processes; and humus, the organic remains of decomposed vegetation. In agriculture, soil is…Trending
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