Columbia Encyclopedia

Search results

500 results found

Wyoming, University of

(Encyclopedia)Wyoming, University of, at Laramie; coeducational; land-grant and state supported; chartered 1886, opened 1887. The Rocky Mt. Herbarium, which has an outstanding collection of plants of the central Ro...

Doctrine of Signatures

(Encyclopedia)Doctrine of Signatures, the concept that the key to humanity's use of various plants was indicated by the form of the plant. The red sap of the bloodroot (Sanguinaria canadensis), for instance, was be...

gibberellins

(Encyclopedia)gibberellins jĭbˌərĕlˈĭnz [key], a group of growth-regulating substances of plants, having complex chemical structure, of which the best known, gibberellic acid, is noted for its promotion of st...

dry rot

(Encyclopedia)dry rot, fungus disease that attacks both softwood and hardwood timber. Destruction of the cellulose causes discoloration and eventual crumbling of the wood. This frequently results in the collapse of...

Tshwane, City of

(Encyclopedia)Tshwane, City of, metropolitan municipality (2011 pop. 2,921,488), Gauteng prov., NE South Africa. Pretoria is the municipal seat; other communities include Soshanguve, Mamelodi, Mabopane, and Centuri...

fungal infection

(Encyclopedia)fungal infection, infection caused by a fungus (see Fungi), some affecting animals, others plants. Serious damage is done to crops each year by fungal infections of plants such as smuts, rusts, ergo...

blight

(Encyclopedia)blight, general term for any sudden and severe plant disease or for the agent that causes it. The term is now applied chiefly to diseases caused by bacteria (e.g., bean blights and fire blight of frui...

water, desalination of

(Encyclopedia)water, desalination of, process of removing soluble salts from water to render it suitable for drinking, irrigation, or industrial uses. The principal methods used for desalination include distillatio...

rose of Sharon

(Encyclopedia)rose of Sharon, common name for several plants, especially Hibiscus syriacus, of the family Malvaceae (mallow family), and for St.-John's-wort, i.e., any species of the genus Hypericum of the family H...

National Institutes of Health

(Encyclopedia)National Institutes of Health (NIH), agency of the U.S. Public Health Service, with headquarters in Bethesda, Md. It was established initially in 1887 as a laboratory in the U.S. Marine Hospital on St...