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stereochemistry

(Encyclopedia)stereochemistry, study of the three-dimensional configuration of the atoms that make up a molecule and the ways in which this arrangement affects the physical and chemical properties of the molecule. ...

food preservation

(Encyclopedia)food preservation, methods of preparing food so that it can be stored for future use. Because most foods remain edible for only a brief period of time, people since the earliest ages have experimented...

Lot, in the Bible

(Encyclopedia)Lot, in the Book of Genesis, the son of Abraham's brother Haran. Lot settled in Sodom and received a warning of its destruction. As he fled with his family, his wife, disobeying God's orders, looked b...

Nam Co

(Encyclopedia)Nam Co or Nam Tso both: näm tsō [key], salt lake, 950 sq mi (2,461 sq km), central Tibet, SW China. The largest lake in Tibet, it lies at an altitude of 15,180 ft (4,627 m). ...

Zewail, Ahmed Hassan

(Encyclopedia)Zewail, Ahmed Hassan, 1946–2016, Egyptian-American chemist, b. Damanhur, Egypt, Ph.D. Univ. of Pennsylvania, 1974. He became a U.S. citizen in 1982. A professor at the California Institute of Techno...

amide

(Encyclopedia)amide ămˈīd [key], organic compound formed by reaction of an acid chloride, acid anhydride, or ester with an amine. Under strong acidic conditions an amide can be hydrolyzed to yield an amine and a...

Wollaston, William Hyde

(Encyclopedia)Wollaston, William Hyde, 1766–1828, English scientist, M.D. Cambridge, 1793. His wide-ranging scientific achievements include the discovery (1802) of the dark lines (Fraunhofer lines) in the solar s...

Lloydminster

(Encyclopedia)Lloydminster loidˈmĭnstər [key], city (1991 pop. in Alberta, 10,042; in Saskatchewan, 7,241), on the Alta.-Sask. boundary, Canada. The city is chartered by both provinces. Farming and ranching are ...

sea

(Encyclopedia)sea, term used as synonymous with ocean, or a subdivision of an ocean (Caribbean Sea, Yellow Sea), or erroneously designating a large salt lake (Caspian Sea, Dead Sea, Aral Sea). ...

Bad Kreuznach

(Encyclopedia)Bad Kreuznach bät kroitsˈnäkh [key], city, Rhineland-Palatinate, W Germany, on the Nahe River. Its ...