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Tizard, Sir Henry Thomas

(Encyclopedia)Tizard, Sir Henry Thomas, 1885–1959, English physical chemist and scientific adviser. He was educated at Westminster school and Magdalen College, Oxford, from which he received honors in natural sci...

aspirin

(Encyclopedia)aspirin, acetyl derivative of salicylic acid (see salicylate) that is used to lower fever, relieve pain, reduce inflammation, and thin the blood. Common conditions treated with aspirin include headach...

purine

(Encyclopedia)CE5 Purines found in deoxyribonucleic acid (DNA) purine, type of organic base found in the nucleotides and nucleic acids of plant and animal tissue. The German chemist Emil Fischer did much of the...

propanetricarboxylic acid, 2-hydroxy-1,2,3-

(Encyclopedia)propanetricarboxylic acid, 2-hydroxy-1,2,3-, IUPAC name for citric acid. ...

Clements, Frederic Edward

(Encyclopedia)Clements, Frederic Edward, 1874–1945, American plant ecologist and pioneer in the study of succession (see ecology), b. Lincoln, Nebr., grad. Univ. of Nebraska, 1894. From 1917 to 1941 he was in cha...

pyrimidine

(Encyclopedia)CE5 Pyrimidines found in deoxyribonucleic acid (DNA) pyrimidine pīrĭmˈĭdēnˌ [key], type of organic base found in certain coenzymes and in the nucleic acids of plant and animal tissue. The th...

adenosine monophosphate

(Encyclopedia)adenosine monophosphate (AMP) ədĕnˈəsēn mŏnˌəfŏsˈfāt [key], organic compound composed of an adenine base, the sugar ribose, and one phosphate unit. AMP is one of the possible products of th...

Lindahl, Tomas

(Encyclopedia)Lindahl, Tomas, 1938–, Swedish-born British biochemist, grad. Karolinska Institute (Ph.D. 1967, M.D. 1970). Lindahl was a professor at the Univ. of Gothenburg from 1978 to 1982. In 1981 he joined th...

Hahn, Otto

(Encyclopedia)Hahn, Otto ôˈtō hän [key], 1879–1968, German chemist and physicist. His important contributions in the field of radioactivity include the discovery of several radioactive substances, the develop...

turn and bank indicator

(Encyclopedia)turn and bank indicator, aircraft instrument containing one indicator to show turning, or rotation about the vertical axis, and another to show banking, or rotation about the longitudinal axis. The tw...