Stereoisomerism is encountered in the homologous series . 在同系列中存在立体异构现象。
When the sample is irradiated with the laser light of appropriate wavelength , the azo molecules undergo reversible photoinduced anisotropy from trans form to cis form 通过选择合适的激光照射样品,偶氮染料分子结构发生了从反式到顺式的可逆分子异构现象。
Database replication is one of the key techniques in distributed environments . because the database heterogeneities become more and more popular , the researching on heterogeneous database replication is very important both theoretically and practically 数据库复制是分布式环境中的一项关键技术,由于数据库异构现象越来越普遍,研究异构数据库复制无论在理论还是实际上都具有非常重要的意义。