Inactivation of microorganisms in MBR effluent by ultraviolet ( UV) and the influence of photoreactivation and dark repair on it were studied. 考察了紫外线(UV)对MBR出水中微生物的灭活情况,以及光活化和暗修复对细菌灭活效果的影响。
Conclusion It is a good way to solve the problem that gingival margin and crown edge become dark and even greyish black by covering the whole neck with porcelain ( especially the PFM made of precious metal alloy) when we use PFM to repair front teeth defect. 结论金属烤瓷全冠修复前牙缺损时采用全瓷颈缘技术(特殊要求时用贵金属合金的金属烤瓷全冠)能有效地解决基牙龈缘、冠边缘发暗或变灰黑现象。
When MBR effluent samples irradiated by UV were put in dark, dark repair was not found in three hours. However, photoreactivation occurred when the samples were placed under a fluorescence lamp or in the sun. UV消毒后的水在3h内未发现暗修复,但在日光灯和太阳光照射下均发生了光活化。