1.Abstract Guided Tissue Regeneration using collagen membrane was investigated by tetracycline fluorchrome labelling,which showed the dynamics of new alevolar bone and cementum formation.

1.对胶原膜引导牙周组织再术后标本，采用四光标记法，观察探讨了引导牙周组织再术后牙槽骨及牙骨质形成中的钙。

2.RESULTS The chlortetracycline's epimer, tetracycline and its epimer, as impurities in chlortetracycline have been determined by the liquid chromatogram and its first order mass spectrum.

2.结果得到金霉样品液相色谱图以及液相色谱峰对应的一级质谱图。对谱图进行分析归纳,推测金霉样品中含有四、差向异构四和差向异构金霉杂质组分。