氟

From the starting material: propargyl alcohol, the building block was prepared easily by Jones oxidation, esterfication, bromination and selective trifluoromethylation.

第一部分：从丙炔醇出发，经过Jones氧化，甲酯化，顺式二溴化，再选择性地在酯基的β位实现三氟甲基化，合成了目标含氟砌块。

A series of α-(fluoro-substituted phenyl)pyridines have been synthesized by means of a palladium-catalyzed cross-coupling reaction between fluoro-substituted phenylboronic acid and 2-bromopyridine or its derivatives. The reactivities of the phenylboronic acids containing di- and tri-fluoro substituents with α-pyridyl bromide were investigated in different catalyst systems.

利用钯催化的SUZUKI偶联反应，以氟取代的苯硼酸与2-溴吡啶为原料合成了系列新的邻吡啶芳香化合物，研究了二及三氟取代的苯硼酸与溴代吡啶在不同催化体系中的反应性质。

Results Fluoridated milk had significant effects of remineralization,anti-deminer alization and anti-caries.

结果 氟化牛奶有明显的再矿化、抗酸脱矿及抗龋作用，而氟水有一定的抗酸脱矿及抗龋作用，无再矿化作用。

The anticaries and remineralization potentiality of the slow-release fluoride tablet can control the enamel area of 96 mm2. The tablet can meet the clinical demands.

该缓释氟粘贴片体外抗龋和再矿化潜力很大，即在本实验条件下，连续给30片氟粘贴片，最大限度能控制96 mm2大小的釉面，预计能够满足临床的需要。

Study on removement of phthalates in drinking water from municipal water supply system;2. The influence concem about fluorid effecting the health was discussed,thinking that there is a suitable density fluorid in the drinking water.

对新乡市不同水质中氟化物含量进行了测定分析，结果表明，地层水和管网水中氟含量适中，山泉水和矿泉水中氟含量偏低，纯净水和矿物质水中未检出氟化物。

Group 3, 10mg/kg of tetrand- rine, half dose was added every 30min.

氟苯桂嗪组：氟苯桂嗪0.5mg/kg，4h后追加半量。

The mechanism of fluoride was studied to provide the new knowledge on desiging related medicine to solve serious loss in sericicultural industry and protect human and other living thing from fluoride.

探索家蚕的耐氟中毒的机制，为设计相关的药物解决当前氟化物对家蚕业的破坏，以及为研究氟化物对人类及其它生物氟中毒的防御和治疗提供新的知识。

METHODS: We measured levels of blood hydroperoxides as an indexof oxidative injury of cellular components, as well as plasmaferric-reducing ability as an index of total antioxidant potential,during sigmoidectomy under four conditions: open sigmoidectomywith sevoflurane anesthesia, laparoscopic sigmoidectomy withsevoflurane anesthesia, open sigmoidectomy with propofol anesthesia,and laparoscopic sigmoidectomy with propofol anesthesia.

在四种不同麻醉方法下乙状结肠切除术中，测定血液中的过氧化氢水平作为细胞氧化损伤的指标，以及血浆铁还原能力作为总抗氧化潜力的指标：七氟醚麻醉开腹乙状结肠切除术，七氟醚麻醉腹腔镜下乙状结肠切除术，异丙酚麻醉开腹乙状结肠切除术，异丙酚麻醉腹腔镜下乙状结肠切除术。

Sodium silicofluoride is one of the important chemical products,which is widely used in different fields.

1氟硅酸钠产品结块原理1.1晶桥当氟硅酸钠颗粒吸附周围空气中的水分或颗粒内部的水分或游离的氯化氢扩散到表面，就会在颗粒表面形成溶液膜。

To enrich the outlook of glass-ceramics and improve its competitive power, an ingredients schedule with fly-ash solid residue as main raw materials, which contained fluorine after some valuable materials were obtained, was put forward based on theoretic analysis, making use of the characteristics of silicofluoride as crystal nucleating agents.

为丰富微晶玻璃外观色泽，提高产品竞争力，利用氟硅酸盐在微晶玻璃制备中可作成核剂的特性，经过理论分析确定以粉煤灰提取有价成分后的含氟固体残渣为主要原料生产镁橄榄石微晶玻璃的配料。

The basic concept of FOP can be summarized as to further optimize effective prescription according to the standard of curative effects and with the aid of modern science and technology and theories of traditional Chinese medicine.

其基本内涵可概括为：以确有疗效的中药复方为研究对象，以现代科学技术和传统中医药理论为技术支持，以该复方所治病证的药效响应为评价标准，以优化重组疗效更优的新复方为研究目的。

Ever since our world has been a world, native forests have been indiscriminately exploited by man.

自从我们的世界一直是世界原生森林被任意剥削人。