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photochemistry

(Encyclopedia)photochemistry, study of chemical processes that are accompanied by or catalyzed by the emission or absorption of visible light or ultraviolet radiation. A molecule in its ground (unexcited) state can...

superfluidity

(Encyclopedia)superfluidity, tendency of liquid helium below a temperature of 2.19K to flow freely, even upward, with little apparent friction. Helium becomes a liquid when it is cooled to 4.2K. Special methods...

machine

(Encyclopedia)machine, arrangement of moving and stationary mechanical parts used to perform some useful work or to provide transportation. From a historical perspective, many of the first machines were the result ...

North Dakota, University of

(Encyclopedia)North Dakota, University of, at Grand Forks; state supported; coeducational; chartered 1883, opened 1884. It has several professional schools, including those for aerospace sciences, engineering and m...

glycolysis

(Encyclopedia)glycolysis glīkŏlˈĭsĭs [key], term given to the metabolic pathway utilized by most microorganisms (yeast and bacteria) and by all “higher” animals (including humans) for the degradation of gl...

Mitchell, Peter Dennis

(Encyclopedia)Mitchell, Peter Dennis, 1920–92, British chemist, Ph.D. Cambridge, 1950. A professor at the Univ. of Edinburgh (1955–63), Mitchell was named director of Glynn Research Laboratories in 1964. He for...

North Augusta

(Encyclopedia)North Augusta, city (1990 pop. 15,351), Aiken co., SW S.C., on the Savannah River opposite Augusta, Ga.; settled c.1860, inc. 1906. Located in an agricultural region, it is mostly residential. Railroa...

glycogen

(Encyclopedia)glycogen glīˈkəjən [key], starchlike polysaccharide (see carbohydrate) that is found in the liver and muscles of humans and the higher animals and in the cells of the lower animals. Chemically it ...

Los Alamos

(Encyclopedia)Los Alamos lôs ălˈəmōsˌ, lŏs [key], uninc. town (1990 pop. 11,455), seat of Los Alamos co., N central N.Mex. It is on a long mesa extending from the Jemez Mts. The U.S. government chose the sit...

Lilienthal, David Eli

(Encyclopedia)Lilienthal, David Eli lĭlˈyənthôl [key], 1899–1981, American public official, b. Morton, Ill. He was admitted (1923) to the bar, practiced law, and was appointed by Gov. Philip La Follette to th...