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Koop, C. Everett

(Encyclopedia)Koop, C. Everett (Charles Everett Koop), 1916–2013, American physician, U.S. surgeon general (1982–89), b. Brooklyn, N.Y., grad. Dartmouth (B.S., 1937), Cornell Medical College (M.D., 1941), Univ....

Jones, Ernest

(Encyclopedia)Jones, Ernest, 1879–1958, British psychoanalyst, b. Wales. He taught (1910–13) at the Univ. of Toronto and was director (1908–13) of the Ontario Clinic for Nervous Diseases. He founded the Inter...

color blindness

(Encyclopedia)color blindness, visual defect resulting in the inability to distinguish colors. About 8% of men and 0.5% of women experience some difficulty in color perception. Color blindness is usually an inherit...

Burnet, Sir Macfarlane

(Encyclopedia)Burnet, Sir Macfarlane, 1899–1985, Australian virologist and physician. He was resident pathologist (1923–24) at the Royal Melbourne Hospital and a Beit fellow (1926–27) at the Lister Institute,...

dwarf tree

(Encyclopedia)dwarf tree, in horticultural practice, a tree artificially kept to a smaller size than is normal for average members of the species. This is usually accomplished either by limiting its root space and ...

pennyroyal

(Encyclopedia)pennyroyal, name for two similar plants of the family Labiatae (mint family), usually distinguished as true, or European, pennyroyal (Mentha pulegium) and American, or mock, pennyroyal (Hedeoma pulegi...

essential oils

(Encyclopedia)essential oils, volatile oils that occur in plants and in general give to the plants their characteristic odors, flavors, or other such properties. Essential oils are found in various parts of the pla...

cyclosis

(Encyclopedia)cyclosis sīklōˈsĭs [key], streaming of cytoplasm within a living cell without deformation of the external cell membrane. In some plant cells there is a rapid rotatory cytoplasmic movement, which i...

hydroponics

(Encyclopedia)hydroponics, growing of plants without soil in water to which nutrients have been added. Hydroponics has been used for over a century as a research technique, but not until 1929 were experiments condu...

love-in-a-mist

(Encyclopedia)love-in-a-mist, hardy annual garden plant (Nigella damascena) of the family Ranunculaceae (buttercup family), having finely cut foliage and blue or white flowers surrounded by a cluster of thready bra...