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Harpestreng, Henrik

(Encyclopedia)Harpestreng, Henrik, or Henricus Dacus, d. 1244, Danish herbalist and medical writer. He probably studied at the medical school in Salerno, and was a canon at Roskilde Cathedral, then Denmark's eccles...

pellagra

(Encyclopedia)pellagra pəlăgˈrə [key], deficiency disease due to a lack of niacin (nicotinic acid), one of the components of the B complex vitamins in the diet. Niacin is plentiful in yeast, organ meats, peanut...

Casa, Giovanni della

(Encyclopedia)Casa, Giovanni della jōvänˈnē dĕlˈlä käˈzä [key], 1503–56, Italian cleric and poet. He was archbishop of Benevento and papal nuncio to Venice. He wrote lyric verse, a life of Bembo, and a ...

castor oil

(Encyclopedia)castor oil, yellowish oil obtained from the seed of the castor bean. The oil content of the seeds varies from about 20% to 50%. After the hulls are removed the seeds are cold-pressed. Medicinal castor...

Geiger counter

(Encyclopedia)Geiger counter or Geiger-Müller (G-M) counter gīˈgər-mŭlˈər, –myo͞oˈlər [key], instrument for the detection and quantitative determination of ionizing radiation such as the alpha and beta ...

starch

(Encyclopedia)starch, white, odorless, tasteless, carbohydrate powder. It plays a vital role in the biochemistry of both plants and animals and has important commercial uses. In green plants starch is produced by p...

Pliny the Elder

(Encyclopedia)Pliny the Elder (Caius Plinius Secundus) plĭˈnē [key], c.a.d. 23–a.d. 79, Roman naturalist, b. Cisalpine Gaul. He was a friend and fellow military officer of Vespasian, becoming eventually an arm...

Lithuanian

(Encyclopedia)Lithuanian lĭthˌo͞oāˈnēən [key], a language belonging to the Baltic subfamily of the Indo-European family of languages (see Baltic languages). The official language of Lithuania since 1918, Lit...

molecular modeling

(Encyclopedia)molecular modeling, the computer simulation, by various means, of chemical structures or processes. Special computer-graphics programs can display three-dimensional images of molecular structures and ...

Mann, Sally

(Encyclopedia)Mann, Sally, 1951–, American photographer, b. Lexington, Va., as Sally Munger, studied Bennington College, Hollins College (B.A. 1974, M.A. 1975). Interested in older photographic techniques, Mann u...