氟化作用

Tieguanyin fluoride in about 40% to 80% dissolved in water, with the teeth vulnerable to a combination of calcium, in the teeth formed on the surface of a layer of calcium fluoride, anti-acid plays the role of anti-caries.

铁观音中的氟化物约有40%～80%溶解于开水，极易与牙齿中的钙质相结合，在牙齿表面形成一层氟化钙，起到防酸抗龋的作用。

Objective: To observe the clinical effects of Green Or, Gluma desensitizer and 75% sodium fluoride glycerin on the treatment of root-dentin hypersensitivity after subgingival scaling with ultrasonic instruments and discuss its desensitization mechanism.

目的：评价极固宁、Gluma脱敏剂、75%氟化钠甘油治疗超声龈下刮治所致根面牙本质敏感症的临床疗效，探讨其作用机制。

Typical for a nonpolar gas, it is poorly soluble in water but soluble in nonpolar organic solvents.

六氟化硫是个极为惰性的气体，不与水、盐酸、氢氧化钠和熔融的钠作用，但会与金属锂反应并放热。

The direct combination of sodium fluoride to the different types of DNA was investigated using UV absorption spect romet ry.

以紫外吸收光谱法测定了氟化钠与不同类型DNA 的直接结合作用。

Primary cultured rat hepatocytes were cultured with various concentrations of sodium fluoride for 24 hours to study the toxicity and possible mechanism induced by fluoride from morphological, enzymological and biochemical changes.

收集细胞培养上清液，测定ALT和AST活性和MDA含量。用上述指标来评价氟化钠对肝细胞的毒性作用及其可能机制。

The results show that the optimum catalysts for the Michael addition and the nitroreduction were tetrabutylammoniumfioride and titanium trichloride, and the yields of the addition product and the reduction product were 54% and 78%, respectively.

结果表明，Michael加成反应和硝基还原反应的最佳催化剂分别是氟化四丁基铵和三氯化钛，在二者催化作用下所得加成产物和还原产物的收率分别为54%和78%。

It was shown from the results that emulsifier TP-Ⅴ which was prepared by PEG 4000 reacted with TME, in the molar ratio of TME to PEG 2:1, at about 110℃ for 1 h, catalyzed by boron trifluoride diethyl etherate, has a very good emulsifying impact for TME. Particle size distribution of the emulsion was homo-geneous and viscosity of the emulsion was small.

实验结果表明，以M相对适中的PEG4000与TME按物质的量比2： 1、在催化剂三氟化硼乙醚作用下、110℃左右反应1h合成的乳化剂TP-Ⅴ，对萜烯基环氧树脂具有很好的乳化效果，制备的乳液粒子粒径均一度较高，乳液表观黏度较小。

The novel vacuum furnace is employed in laboratory study. Compared with atmosphere magnesium carbothermic reduction furnace, this new one has the merits of high automation, easy manipulation and fine safety. Vacuum coking, vacuum carbothermic reduction process and magnesium vapory condensation process can be carried out in a furnace.

小型实验结果证明：还原温度升高，还原时间延长，氧化镁还原率增大，添加适量的氟化物对还原反应有促进作用；还原过程中真空度随时间的变化具有规律性，由此可以判断还原反应进行的速度与程度；真空中煤还原氧化镁的条件是：配料时保证C：MgO=3：1，并加入占总料重10％的氟化钙作为催化剂，尽可能的提高反应温度至1500℃以上，保温30～40分钟。

AIM: Using a new laser fluorescence device - the KaVo DIAGNOdent,we studied the occlusive effects of mixed solution of NaHCO 3 and NaF on dentinal tubules.

目的 ：用激光荧光仪定量研究碳酸氢钠和氟化钠混合液对牙本质小管的堵塞作用。

Objective To investigate the effects of perfluorochemical on in vitro long-term hypothermic heart preservation in rats.

目的 研究全氟化碳化合物在大鼠离体心脏长时程低温保存中的作用。

Lugalbanda was a god and shepherd king of Uruk where he was worshipped for over a thousand years.

Lugalbanda 是神和被崇拜了一千年多 Uruk古埃及喜克索王朝国王。

I am coming just now,' and went on perfuming himself with Hunut, then he came and sat.

我来只是现在，'歼灭战perfuming自己与胡努特，那麼，他来到和SAT 。