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diseases of plants

(Encyclopedia)diseases of plants. Most plant diseases are caused by fungi, bacteria, and viruses. Although the term disease is usually used only for the destruction of live plants, the action of dry rot and the rot...

acquired characteristics

(Encyclopedia)acquired characteristics, modifications produced in an individual plant or animal as a result of mutilation, disease, use and disuse, or any distinctly environmental influence. Some examples are docki...

Gorgas, William Crawford

(Encyclopedia)Gorgas, William Crawford, 1854–1920, American disease and sanitation expert, surgeon general of the United States, b. Mobile, Ala., grad. Bellevue Hospital Medical College, 1879. He served with the ...

river blindness

(Encyclopedia)river blindness or onchocerciasis, disease caused by the parasitic nematode worm Onchocerca volvulus. The worm larvae are transmitted by the bites of blackflies (genus Simulium) that live in fast movi...

malaria

(Encyclopedia)malaria, infectious parasitic disease that can be either acute or chronic and is frequently recurrent. Malaria is common in Africa, Central and South America, the Mediterranean countries, Asia, and ma...

muscular dystrophy

(Encyclopedia)muscular dystrophy dĭsˈtrōfē [key], any of several inherited diseases characterized by progressive wasting of the skeletal muscles. There are five main forms of the disease. They are classified ac...

hemophilia

(Encyclopedia)hemophilia hēˌməfĭlˈēə, –fēlˈyə [key], genetic disease in which the clotting ability of the blood is impaired and excessive bleeding results. The disease is transmitted through females but...

Kirkwood

(Encyclopedia)Kirkwood, city (1990 pop. 27,291), St. Louis co., E Mo., a suburb of St. Louis; inc. 1865. Primarily residential, it has some light manufacturing. ...

Harris, Frank

(Encyclopedia)Harris, Frank, 1856–1931, British-American author, b. Galway, Ireland. He studied at the Univ. of Kansas, became a U.S. citizen, and returning to England, edited successively a number of periodicals...

Hess, Victor Francis

(Encyclopedia)Hess, Victor Francis, 1883–1964, American physicist, b. Austria, Ph.D. Univ. of Graz, 1906. After teaching at the universities of Graz and Innsbruck, he came to the United States in 1938 and was lat...