口腔变形链球菌是龋病的主要致病菌，血链球菌为牙周有益菌。
Oral Streptococcus mutans is an etiologic agent of dental caries and Streptococcus sangius is in favor of periodontal tissues.
本文以大肠杆菌为参照，对变形链球菌和血链球菌ATP酶的基因结构进行比较，探讨口腔致龋菌的质子移位膜ATP酶的结构特性。
In order to understand the genetic structure of F-ATPase of S. matans, we discuss the structure of F-ATPase of E. coli, S. matans and S. sanguis.
经AP_PCR扩增，24名儿童口腔中检测出29个不同基因型的变形链球菌，其中携带2个以上基因型儿童占45.8%。
A total of 46 S. mutans isolates from 24 subjects were analyzed by AP_PCR, and 29 different amplitypes were identifyied, 45.8% carried two genotypes.
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