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antibiotic

(Encyclopedia)antibiotic, any of a variety of substances, usually obtained from microorganisms, that inhibit the growth of or destroy certain other microorganisms. Although for centuries preparations derived from ...

Heck, Richard Fred

(Encyclopedia)Heck, Richard Fred, 1931–2015, American chemist, b. Springfield, Mass., Ph.D. Univ. of California, Los Angeles, 1954. Heck was a researcher at the Hercules Corporation in Wilmington, Del., from 1957...

Gunn, Thom

(Encyclopedia)Gunn, Thom (Thomson William Gunn), 1929–2004, Anglo-American poet, b. Gravesend, Kent, England, grad. Trinity College, Cambridge (1953). Gunn published his first volume of poems, the critically accl...

Nielsen, A. C.

(Encyclopedia)Nielsen, A. C. (Arthur Charles Nielsen) nēlˈsən [key], 1897–1980, American market researcher, b. Chicago, grad. Univ. of Wisconsin, Madison (B.S., 1918). He worked as an electrical engineer befor...

nephritis

(Encyclopedia)nephritis nəfrīˈtəs [key], inflammation of the kidney. The earliest finding is within the renal capillaries (glomeruli); interstitial edema is typically followed by interstitial infiltration of ly...

packaging

(Encyclopedia)packaging, containment and packing prior to sale with the primary purpose of facilitating the purchase and use of a product. Before 1800 packaging was restricted almost entirely to containment for shi...

tetracycline

(Encyclopedia)tetracycline tĕˌtrəsīˈklēn [key], any of a group of antibiotics produced by bacteria of the genus Streptomyces. Effective against a wide range of Gram positive and Gram negative bacteria, tetrac...

yew

(Encyclopedia)yew, name for evergreen trees or shrubs of the genus Taxus, somewhat similar to hemlock but bearing red berrylike fruits instead of true cones. Of somber appearance, with dark green leaves, the yew si...

Scott-Heron, Gil

(Encyclopedia)Scott-Heron, Gil, 1949–2011, American poet, musician, and songwriter, b. Chicago. Often considered “the godfather of rap music,” he rejected that ...

rotavirus

(Encyclopedia)rotavirus, double-stranded RNA virus, genus Rotavirus, with a wheellike appearance that can cause severe watery diarrhea and vomiting, sometimes leading to severe dehydration and death. The virus is t...