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Banks, Dennis James

(Encyclopedia)Banks, Dennis James, 1937–2017, Native American civil-rights activist, b. Leech Lake Reservation, Minn. Of Ojibwa (Chippewa) heritage, he helped found the American Indian Movement (1968) to fight fo...

Samper Pizano, Ernesto

(Encyclopedia)Samper Pizano, Ernesto ĕrnĕsˈtō sämpĕrˈ pēzäˈnō [key], 1950–, Colombian politician, president of Colombia (1994–98), b. Bogotá. An economist, lawyer, former professor, and member of th...

bacteriophage

(Encyclopedia)bacteriophage băktērˈēəfājˌ [key], virus that infects bacteria and sometimes destroys them by lysis, or dissolution of the cell. Bacteriophages, or phages, have a head composed of protein, an i...

streptococcus

(Encyclopedia)streptococcus strĕpˌtəkŏkˈəs [key], any of a group of gram-positive bacteria, genus Streptococcus, some of which cause disease. Streptococci are spherical and divide by fission, but they remain ...

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...

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...