| 单词 | colouring principle |
| 释义 | > as lemmascolouring principle c. Chemistry. A constituent of a substance obtained by chemical analysis or separation; esp. one responsible for a characteristic property or effect. Now usually with distinguishing word, as active principle, bitter principle, colouring principle. ΘΚΠ the world > matter > chemistry > chemical assay or analytical chemistry > [noun] > analytical constituents principle1708 group1843 1708 tr. J. P. de Tournefort Materia Medica ii. i. i. 261 Upon a chymical Analysis, Rosemary..yields a copious Quantity of Oil and urinous Spirit: So that the chief active Principle of this Plant is an oily and aromatick Salt. 1732 J. Arbuthnot Pract. Rules of Diet i. 259 By which Principles they [sc. spices] are heating, and act strongly. 1769 E. Bancroft Ess. Nat. Hist. Guiana 299 It is but seldom that either Animal or Vegetable Poisons derive their deleterious properties from either of these principles. 1799 Med. & Physical Jrnl. 1 161 The narcotic principle is contained chiefly in those vegetables which..have a direct tendency to induce sleep. 1813 H. Davy Elements Agric. Chem. iii. 84 The bitter principle is very extensively diffused in the vegetable kingdom. 1842 E. A. Parnell Elements Chem. Anal. (1845) 284 To coagulate various animal principles which may be present. 1875 H. C. Wood Treat. Therapeutics (1879) 26 The active principle of the vegetable astringents is tannic acid,..it is almost their sole therapeutic principle. 1910 Encycl. Brit. VIII. 749/1 Two colouring principles exist in Old Fustic, namely, morin and maclurin. 1953 R. W. Fairbrother Text-bk. Bacteriol. (ed. 7) xxix. 350 Sodium thioglycollate is the active principle of Brewer's medium.., which is now widely used in the investigation of the anaerobes. 2001 Exotic & Greenhouse Gardening June 24/4 Other members of the Solanum genus contain the same poisonous principle. < as lemmas |
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