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heat of combustion

(Encyclopedia) heat of combustion, heat released during combustion. In particular, it is the amount of heat released when a given amount (usually 1 mole) of a combustible pure substance is burned to…

Jerusalem artichoke

(Encyclopedia) Jerusalem artichoke, tuberous-rooted perennial (Helianthus tuberosus) of the family Asteraceae (aster family), native to North America, where it was early cultivated by the indigenous…

shell money

(Encyclopedia) shell money, medium of exchange consisting of shells, the most widely distributed type of ancient currency. Shells are particularly useful as money because they may be strung in long…

Shimomura, Osamu

(Encyclopedia) Shimomura, Osamu, 1928–2018, Japanese organic chemist and marine biologist, Ph.D. Nagoya Univ., 1960. Shimomura was a researcher at Princeton (1960–82) and a professor (1982–2001)…

Slipher, Vesto Melvin

(Encyclopedia) Slipher, Vesto MelvinSlipher, Vesto Melvinslīˈfər [key], 1875–1969, American astronomer, b. Mulberry, Ind. From 1901 he was at Lowell Observatory, Flagstaff, Ariz., where he served as…

Spence, Michael

(Encyclopedia) Spence, Michael (Andrew Michael Spence), 1943–, American economist and educator, b. Montclair, N.J., Ph.D. Harvard, 1972. He has taught at Stanford (1973–75, 1990–99), Harvard (1975–90…

Crutzen, Paul Jozef

(Encyclopedia) Crutzen, Paul Jozef, 1933–2021, Dutch atmospheric chemist, grad. Univ. of Stockholm (Ph.D. 1968, D.Sc. 1973). After working (1977–80)…

friar

(Encyclopedia) friar [Lat. frater=brother], member of certain Roman Catholic religious orders, notably, the Dominicans, Franciscans, Carmelites, and Augustinians. Although a general form of address…

Gibson, John Bannister

(Encyclopedia) Gibson, John Bannister, 1780–1853, American jurist, b. Westover Mills, Pa.; nephew of the American frontiersman John Gibson. He studied law, was unsuccessful in practice, and served (…

Velociraptor

(Encyclopedia) VelociraptorVelociraptorvəlŏsˈĭrăpˌtər [key] [Gr.,=swift robber], swift bipedal carnivorous dinosaur of the late Cretaceous period. It was relatively small, being approximately 6 ft (1…