Nanoindentation and XPS Studies of Titanium TNZ Alloy after Electrochemical Polishing in a Magnetic Field

This work presents the nanoindentation and XPS results of a newly-developed biomaterial of titanium TNZ alloy after different surface treatments. The investigations were performed on the samples AR (as received), EP (after a standard electropolishing) and MEP (after magnetoelectropolishing). The electropolishing processes, both EP and MEP, were conducted in the same proprietary electrolyte based on concentrated sulfuric acid. The mechanical properties of the titanium TNZ alloy biomaterial demonstrated an evident dependence on the surface treatment method, with MEP samples revealing extremely different behavior and mechanical properties. The reason for that different behavior appeared to be influenced by the surface film composition, as revealed by XPS study results displayed in this work. The increase of niobium and zirconium in the surface film of the same titanium TNZ alloy after magnetoelectropolishing MEP treatment is meaningful and especially advantageous considering the application of this alloy as a biomaterial.     

高效液相色谱法测定含服替硝唑含片后唾液中含量的药时关系

用高效液相色谱法测定了含服替硝唑含片后人唾液中替硝唑含量，用高氯酸沉淀蛋白质后，直接ＯＤＳ柱上测定，紫外检测波长３１７ｎｍ，流动相为甲醇－水＝冰醋酸（２５：７５：０．１），方法回收率在９９％以上，最小检测限为０．１０ｍｇ／Ｌ；该方法简便、快速、准确。     

替硝唑治疗急性冠周炎及急性尖周炎的临床疗效观察

目的：观察替硝唑（Tinidazole,TNZ）治疗急性冠周炎和急性尖周炎的临床疗效。方法：用替硝唑分别治疗29例急性冠周炎,38例急性尖周炎患者,用甲硝唑治疗32例急性冠周炎,40例急性尖周炎患者,分析两种药物的临床疗效。结果：替硝唑治疗急性冠周炎及急性尖周炎的有效率为96．6％及94．7％,而甲硝唑则为77％及75％,P＜0．05。结论：替硝唑具有抗厌氧菌性强,疗效高而副作用少等优点。