| 释义 |
carbamide Chem.|ˈkɑːbəmaɪd|
[f. carb- + amide.]
Analytical name of the organic compound urea, CO·2(NH2), as a primary diamide of Carbonyl. Hence sulpho-carbamide or sulphur urea, in which CS takes the place of CO.
Also carˈbamic [see amic] a., related to carbamide, as in carbamic acid, CO·NH2·OH, carbamic ethers. ˈcarbamate, a salt of carbamic acid, as ammonium carbamate, CO·NH2· O·NH4.
1865Mansfield Salts 367 The compound ‘Carbamide’ is not yet known in the separate state. 1877Watts Fownes' Chem. II. 391 Carbamide or Urea..was the first instance of the artificial formation of a product of the living organism. 1869Roscoe Elem. Chem. xxxv. 382 Carbamic Acid.
Add: Hence also ˈcarbamyl n. |-maɪl, -mɪl|, the monovalent radical NH2CO{b1} , derived from carbamic acid; usu. attrib.
[1906Tingle & Robinson in Amer. Chem. Jrnl. XXXVI. 230 The compound was designated..as ‘semicarbazine camphoformeneaminecarboxylic acid’... The term ‘carbamyl’ designates satisfactorily the carbamide residue, {b1}NHCONH2 , which is present.] 1907Chem. Abstr. I. 2107 Carbamyl chloride does not react readily with phenols. 1954S. Duke-Elder Parsons' Dis. Eye (ed. 12) v. 70 Two drugs are sometimes employed which combine the direct and indirect methods of stimulation [of the eye muscles]—doryl (carbachol) (carbamyl-choline chloride) (1.0 per cent.) and urecholine. 1970R. W. McGilvery Biochem. xx. 487 Uracil and thymine are metabolized by the same routes... The two products are carbamyl derivatives of the corresponding β-amino acids... The carbamyl group is removed by hydrolysis, releasing the free amino acids and ammonia and CO2. |