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rhythm, biological

(Encyclopedia)rhythm, biological, or biorhythm, cyclic pattern of physiological changes or changes in activity in living organisms, most often synchronized with daily, monthly, or annual cyclical changes in the env...

histology

(Encyclopedia)histology hĭstŏlˈəjē [key], study of the groups of specialized cells called tissues that are found in most multicellular plants and animals. Histologists study the organization of tissues at all ...

horticulture

(Encyclopedia)horticulture [Lat. hortus=garden], science and art of gardening and of cultivating fruits, vegetables, flowers, and ornamental plants. Horticulture generally refers to small-scale gardening, and agric...

Watson, James Dewey

(Encyclopedia)Watson, James Dewey, 1928–, American biologist and educator, b. Chicago, Ill., grad. Univ. of Chicago, 1947, Ph.D. Univ. of Indiana, 1950. With F. H. C. Crick he began (1951) research on the molecul...

centrifuge

(Encyclopedia)centrifuge sĕnˈtrəfyo͞oj [key], device using centrifugal force to separate two or more substances of different density, e.g., two liquids or a liquid and a solid. The centrifuge consists of a fixe...

Mommsen, Theodor

(Encyclopedia)Mommsen, Theodor tāˈōdōr mômˈsən [key], 1817–1903, German historian. Appointed (1848) professor of civil law at the Univ. of Leipzig, he supported the Revolution of 1848 and lost his chair be...

Marston, John

(Encyclopedia)Marston, John, 1576–1634, English satirist and dramatist, b. Oxfordshire, grad. Oxford, 1594. In accordance with his father's wishes he studied law at Middle Temple, but his interests soon turned to...

Beaumarchais, Pierre Augustin Caron de

(Encyclopedia)Beaumarchais, Pierre Augustin Caron de pyĕr ōgüstăNˈ karôNˈ də bōmärshāˈ [key], 1732–99, French dramatist. Originally a watchmaker, he rose to wealth and position among the nobility. His...

Thomson, James , 1834–82, Scottish poet and essayist

(Encyclopedia)Thomson, James, 1834–82, Scottish poet and essayist. He is remembered for his darkly pessimistic poem The City of Dreadful Night. He was raised in an orphan asylum and became (1851) an army teacher ...

Vigée-Lebrun, Élisabeth

(Encyclopedia)Vigée-Lebrun, Élisabeth ālēzäbĕtˈ vēzhāˈ-ləbröNˈ [key], 1755–1842, French portrait painter; pupil of her father, the painter Louis Vigée. She was influenced by Greuze. Summoned to Vers...