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phenylalanine

(Encyclopedia)CE5 phenylalanine fĕnˌəlălˈənēnˌ [key], organic compound, one of the 22 α-amino acids commonly found in animal proteins. Only the l-stereoisomer appears in mammalian protein. It is one of ...

urea

(Encyclopedia)CE5 urea yo͝oēˈə [key], organic compound that is the principal end product of nitrogen metabolism in most mammals. Urea was the first animal metabolite to be isolated in crystalline form; its c...

Klug, Sir Aaron

(Encyclopedia)Klug, Sir Aaron klo͞og [key], 1926–2018, British biochemist, b. Lithuania. Raised and educated in South Africa, he moved to England and completed his doctorate at Trinity College, Cambridge, in 195...

quagga

(Encyclopedia)quagga kwăgˈə [key], extinct type of zebra. It formerly inhabited open plains in S Africa, where its range overlapped that of the plains zebra, or common zebra (Equus quagga, formerly E. burchellii...

Pap test

(Encyclopedia)Pap test, Pap smear, or Papanicolaou test păpˌənēˈkəlou [key], medical procedure used to detect cancer of the uterine cervix (see uterus). A scraping, brushing, or smear, is taken from the surf...

Boston Strangler

(Encyclopedia)Boston Strangler, American serial killer who terrorized the Boston, Mass., area during a killing spree (Jun., 1962–Jan, 1964) that claimed the lives of at least 11 women. The first six victims were ...

Blackburn, Elizabeth Helen

(Encyclopedia)Blackburn, Elizabeth Helen, 1948–, Australian-American molecular biologist, b. Hobart, Tasmania, Australia, Ph.D. Cambridge, 1975. Blackburn was a professor at the Univ. of California, Berkeley, fro...

dandruff

(Encyclopedia)dandruff, excessive flaking of skin from the scalp, apparent as dry or greasy diffuse scaling with variable itching. It is the sign of a skin disease, such as seborrhea or a fungal infection. Treatmen...

caustic

(Encyclopedia)caustic, any strongly corrosive chemical substance, especially one that attacks organic matter. A caustic alkali is a metal hydroxide, especially that of an alkali metal; caustic soda is sodium hydrox...

glycogen

(Encyclopedia)glycogen glīˈkəjən [key], starchlike polysaccharide (see carbohydrate) that is found in the liver and muscles of humans and the higher animals and in the cells of the lower animals. Chemically it ...