白晨曦:As we know that ULI celebrated its 75th anniversary in Los Angeles in October 2011,how would you brief the evolution of ULI in such a long time span?我们
目的 探讨缺氧对人牙周膜成纤维细胞基质金属蛋白酶(matrix metalloproteinase,MMP)和组织金属蛋白酶抑制物(tissue inhibitors of matrix metalloproteinase,TIMP) mRNA表达的影响,以期为牙周组织修复再生机制研究提供依据.方法 组织块法培养人牙周膜成纤维细胞,分为缺氧组和常氧组(对照组).缺氧组细胞分别于1%O2、5% CO