氮

• Since most textile wastes are deficient in nitrogen required for a balanced biological system .
  大多数纺织废水维持生化所需的氮素营养经常不足。
• Most direct substitution of groups bound to an aromatic nucleus is limited to diazonium salts .
  大多数连于芳核能被直接取代的基团仅限于重氮盐。
• Non-basic nitrogen-containing series include pyrroles, indoles, carbazoles and benzcarbazoles .
  不含碱性氮的化合物包括吡咯、吲哚、咔唑和苯咔唑。
• Such blooms do not occur when nitrogen or phosphorus or both are present in very limited amounts .
  当氮或磷或两者存在数量很少时，不出现这种藻花。
• They clearly demonstrated that nitrogenase could catalyze the reduction of acetylene as well as n2
  他们明确地证明，固氮酶能催化乙炔以及N2的还原。
• In some plants, a mild nitrogen deficiency at certain stages of development may be desirable .
  许多植物中，轻度缺氮在其发育的某些阶段可能是适宜的。
• One might expect azomethane to have a y structure similar to that of acetone(ch3)2co .
  可以预期偶氮甲烷分子具有和丙酮（CH3）2CO分子相似的丫形结构。