科学家发现，受尿素污染的海藻能生成一种致密毒素软骨藻酸。
Urea pollution can trigger ocean algae to produce a deadly toxin called domoic acid, scientists have discovered.
目的：研究尿素酶基因在枸橼酸杆菌中的表达情况。
Objective: To detect the expression of urease genes in Citrobacter.
以癸二酸和尿素为原料合成癸二酰胺。
Decanediamide was synthesized using sebacic acid and urea as starting materials.
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