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putrescine

(Encyclopedia)putrescine: see decay of organic matter. ...

Prussian blue

(Encyclopedia)Prussian blue, pigment widely used for laundry bluing, in dyeing compounds, and in the manufacture of inks and paints. Several varieties are known, one of which consists of the chemical compound ferri...

world soul

(Encyclopedia)world soul, Lat. anima mundi, in philosophy, term denoting a universal spirit or soul that functions as an organizing principle. While many early Greek philosophers saw the world as of one principle, ...

free radical

(Encyclopedia)free radical, in chemistry, a molecule or atom that contains an unpaired electron but is neither positively nor negatively charged. Free radicals are usually highly reactive and unstable. They are pro...

Hirsch, Samson Raphael

(Encyclopedia)Hirsch, Samson Raphael, 1808–88, German rabbi and chief exponent of Neo-Orthodoxy. As rabbi in Frankfurt-am-Main, he advocated the organization of autonomous Orthodox congregations outside the state...

Ohr, George Edgar

(Encyclopedia)Ohr, George Edgar, 1857–1918, American ceramist, often considered the first art potter in the United States, b. Biloxi, Miss. He apprenticed in New Orleans, traveled to potteries in 16 states to obs...

Zhupanovsky

(Encyclopedia)Zhupanovsky, compound volcano, 9,705 ft (2,958 m), on the Kamchatka peninsula, Kamchatka Territory, Russia, c.40 mi (65 km) N of Petropavlovsk. Zhupanovsky consists of four stratovolcanoes along a rid...

acetone

(Encyclopedia)acetone prōˈpənōn [key], CH3COCH3, colorless, flammable liquid. Acetone melts at −94.8℃ and boils at 56.2℃. It is the simplest aliphatic ketone. Acetone is widely used in industry as a solve...

benzoic acid

(Encyclopedia)benzoic acid bĕnzōˈĭk [key], C6H5CO2H, crystalline solid organic acid that melts at 122℃ and boils at 249℃. It is the simplest aromatic carboxylic acid (see aryl group and carboxyl group). In ...

Carothers, Wallace Hume

(Encyclopedia)Carothers, Wallace Hume kərŭᵺˈərz [key], 1896–1937, American chemist, b. Burlington, Iowa. He received his doctorate at the Univ. of Illinois in 1924, then taught organic chemistry there and a...