研究利用磁性载体固定微生物处理废水的效果，首先必须测定载体表面固定微生物的含量。
Biomass of bacteria on the surfaces of magnetic carriers is measured to study wastewater treatment by magnetic carriers with immobilized microorganism.
目的：了解磁性附着体基牙龈下微生物组成与正常龈下微生物组成比的差异及卫生指导前后基牙龈下微生物数量及组成的改变。
Objective: to study the changes of microflora in subgingival groove of abutment in patients with magnetic attachments after oral hygienic instruction and with normal persons.
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