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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 ...

bitumen

(Encyclopedia)bitumen bĭtyo͞oˈmən [key] a generic term referring to flammable, brown or black mixtures of tarlike hydrocarbons, derived naturally or by distillation from petroleum. It can be in the form of a vi...

grizzly bear

(Encyclopedia)grizzly bear or grizzly, large, powerful North American brown bear, characterized by gray-streaked, or grizzled, fur. Grizzlies are 6 to 8 ft (180–250 cm) long, stand 31⁄2 to 4 ft (105–120 cm) a...

sherry

(Encyclopedia)sherry [from Jérez], naturally dry fortified wine, pale amber to brown in tint. The term sherry originally referred to wines made from grapes grown in the region of Jérez de la Frontera, Andalusia, ...

yak

(Encyclopedia)yak, bovine mammal, Bos grunniens, of the Tibet region of China and adjacent areas. It is oxlike in build, with short, thick legs, humped shoulders, large upcurved horns, and a thick coat that hangs d...

bead test

(Encyclopedia)bead test, test used in the identification of certain metals. Some metallic ions that cannot be identified by a flame test are identified by a bead test. The test can also be used to confirm the resul...

cacomistle

(Encyclopedia)cacomistle kăkˈəmĭsˌəl [key], small New World mammal, genus Bassaricus, related to the raccoon. There are two species, one found in Mexico and the SW United States, the other in Central America....

bobwhite

(Encyclopedia)bobwhite, common name for an American henlike bird of the family Phasianidae, which also includes the pheasant and the partridge. The eastern bobwhite quail (Colinus virginianus) is about 10 in. (25 c...

Cotton, George Edward Lynch

(Encyclopedia)Cotton, George Edward Lynch, 1813–66, English clergyman and educator, grad. Trinity College, Cambridge, 1836. From 1837 until 1852 he was an assistant master at Rugby and is the “young master” i...

wolframite

(Encyclopedia)wolframite wo͝olˈfrəmītˌ [key], reddish-brown to grayish-black lustrous mineral, a tungstate of iron and manganese, (Fe,Mn)Wo4, occurring in crystals of the monoclinic system. It is the chief ore...