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单词 urea
释义
urea

Chemistry
  • A white crystalline solid, CO(NH2)2; r.d. 1.3; m.p. 135°C. It is soluble in water but insoluble in certain organic solvents. Urea is the major end product of nitrogen excretion in mammals, being synthesized by the urea cycle. Urea is synthesized industrially from ammonia and carbon dioxide for use in urea–formaldehyde resins and pharmaceuticals, as a source of nonprotein nitrogen for ruminant livestock, and as a nitrogen fertilizer.


Biology
  • A white crystalline water-soluble solid, CO(NH2)2. Urea is the major end product of nitrogen excretion in mammals and other ureotelic animals, being synthesized by the urea cycle. Urea is synthesized industrially from ammonia and carbon dioxide for use in urea-formaldehyde resins and pharmaceuticals, as a source of nonprotein nitrogen for ruminant livestock, and as a nitrogen fertilizer.


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