porphyrin ring造句

• The chief differences between chlorophyll and heme are the presence of a magnesium atom in the center of the porphyrin ring .
  叶绿素和血红素之间的主要的差别为在卟啉环中心存在一个镁原子。
• Porphyrins and metalloporphyrins are recognized as perfect host for molecular recognition owing to their diversity , their rigid molecular structures , the position and direction of the substituents on the porphyrin ring being controllable , as well as the variety of metal ligands of the metalloporphyrins
  卟啉及其金属配合物种类多,分子具有刚性结构,卟啉环上取代基的位置和方向可加以控制,且其轴向配体周围的空间大小和相互作用的方向可通过改变配位中心金属加以调节,因而是理想的分子识别受体。