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.

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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.

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血培养阳性率为57.7％，其中主要致病菌是草绿色链球菌（32.4％）和表皮葡萄球菌（15.5％）。

Positive blood culture was found in 71 patients (57.7%) of viridans streptococci (32.4%), staphylococcus epidermidis (15.5%).

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血培养阳性率为57．7％，其中主要致病菌是草绿色链球菌（32．4％）和表皮葡萄球菌（15．5％）。

Positive blood culture was found in 71 patients (57.7% ) of viridans streptococci (32.4% ), staphylococcus epidermidis (15.5% ).

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血培养阳性率为57．7％，其中主要致病菌是草绿色链球菌（32．4％）和表皮葡萄球菌（15．5％）。

Positive blood culture was found in 71 patients (57.7% ) of viridans streptococci (32.4% ), staphylococcus epidermidis (15.5% ).

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