遗传物质DNA和RNA是磷酸二酯，磷酸酯基团是连接核酸的桥连基团。
DNA and RNA as the heredity matters, they belong to phosphoric di-ester that is their bridge linkage group.
以氨基卟啉为基质材料，戊二醛为桥连基合成了一种新型网状纳米结构希夫碱卟啉聚合物。
A new type of Schiff-base porphyrin polymer with network nanostructure was synthesized using tetra(4-aminophenyl) porphyrin(TAPP) as matrix and glutaraldehyde as a bridging compound.
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