氟

Sulfonated poly are prepared by direct polymerization of biphenol A, disodium 4, 4"-difluoro-3, 3"-disulfonate-1, 1-diphenylsulfone and 1, 3-(4-difluorophenyl)benzene. The polymers are characterized with ~1H-NMR, FT-IR.

以双酚A，1，3-二(4-氟苯基)苯和4，4′-二氟-3，3′-二磺酸钠-1，1′-二苯砜采用直接缩合法合成了不同磺化度的磺酸型聚芳醚酮砜，通过FT-IR和~1H-NMR对聚合物进行了表征，证明其结构正确。

The reactivities of the phenyl boronic acids containing di-, tri-fluoro substituents with pyridyl bromide were investigated in different catalyst system.

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。

The overall yield was 43.6%.The yield of reduce of ester was increased nearly one times than the past method because of KBH4-LiCl as the reducing agent instead of NaBH4. Changing the reaction conditions of bromization, the one-way yield enhanced 30%. The yield of reduce of the bromide was added by one times by improving the process. Tefluthrin was achieved by the catalytic esterification of DCC and DMAP.

优化后工艺对四氟对苯二甲酯的还原采用了廉价高效的还原试剂KBH4-LiCl，使收率比NaBH4法提高了近一倍；对溴化反应条件进行了优化，单程收率提高了30%；对溴化物还原条件的优化，使其收率提高了近一倍；采用了催化剂DCC和DMAP合成了最终产品七氟菊酯。

In this paper isopropyl -γ- chlorobutyrate was prepared from γ- butyrolactone by one - step. The effects of molar ratio of reactants, reaction temperature, reaction time on the yield of product were discussed, the optimum reaction condition was obtained.

一氯代丁酸异雨酯是合成新型拟除虫菊酯中间体环丙烷较酸及高效抗菌新药丙氟见酸和环丙氟院酸中间体环丙胺的重要原料［''］。

Synergetic antifungal effects were observed in the combination of albicanyl caffeate or 3,4'-difluorostilbene and fluconazole, whereas additive antifungal effects were revealed when catechin or resveratrol combined with fluconazole.

当与氟康唑联合时，albicanyl caffeate和3，4'-二氟二苯乙烯显示出协同抗真菌活性，而儿茶素与白藜芦醇显示出相加的抗真菌活性。

Patients were divided into two groups treated with rifaximin capsula（200 mg, per 6 h）+Oflxacin dummy capsula（2#,3 times per day） as a treated group and Oflaxaxin（200 mg, three times per day）+ rifaxicin dummy capsula（2#, per 6 h as a control for three days, respectively. 109 patients were enrolled in rifaximin group and 107 patients were enrolled in control group.

试验组用药利福昔明胶囊（200 mg／次，每6 h 1次）＋氧氟沙星胶囊模拟胶囊（2粒，每日3次），对照组用药氧氟沙星胶囊（每次200 mg，每日3次）＋利福昔明胶囊模拟胶囊（2粒，每6 h 1次），疗程3天。

Patients were divided into two groups treated with rifaximin capsula（200 mg, per 6 h）＋Oflxacin dummy capsula（2^#, 3 times per day） as a treated group and Oflaxaxin（200 mg, three times per day）＋ rifaxicin dummy capsula（2s, per 6 h） as a control for three days, respectively.

试验组用药利福昔明胶囊（200mg／次，每6h1次）＋氧氟沙星胶囊模拟胶囊（2粒，每日3次），对照组用药氧氟沙星胶囊（每次200mg，每日3次）＋利福昔明胶囊模拟胶囊（2粒，每6h1次），疗程3天。

The Langendorff model was used, and isolated perfusedrat hearts were separated into untreated, isoflurane, chelerythrine plus isoflurane, and chelerythrine groups.

使用 Langendorff 模型，离体灌注大鼠心脏被分为未治疗组，异氟醚组，白屈菜红碱加异氟醚组和白屈菜红碱组。

In the condition of keeping F、 K、Na content fixed, To improve slag structure and raise slag melting point and viscosity, MgO content is raised and TiO〓 is added. the main content is as follows:(1) Keeping CaO/SiO〓 fixed, MgO content rises from 10% to 16%, the free running temperature goes up 106℃, the viscosity goe down at bigger than 1425℃, but difference is little; keeping /SiO〓 fixed, MgO content rises from 10% to 16%, the free running temperature rises 87℃, the viscosity rises too; adding TiO〓 to 5%, the free running temperature goes up 98℃, the viscosity rise a little.(2) Powder crystal x ray diffraction and microscopic analysis shows: increasing MgO content, the cuspidine will decreace or even disappear, the monticellite goes up with MgO content rising, keeping /SiO〓 fixed, Akermanite content goes up, for high melting point minerals appear or go up, the free running temperature of the slag bearing F is raised; Adding TiO〓, high melting point mineral—Perovskite forms, it can making other minerals'crystalling fast, it is the reason that TiO〓 raises the free running temperature of the slag bearing F.

2对测定粘度的冷凝渣所进行的X粉晶衍射及显微分析和鉴定表明，增加MgO含量，渣中枪晶石将减少甚至消失，而钙镁橄榄石则随MgO含量增加而增加，在／SiO〓不变时，黄长石含量也有所增加，高熔点矿物的出现和增加，提高了含氟熔渣的熔化性温度；加入TiO〓熔渣中将形成高熔点矿物-钙钛矿，钙钛矿的形成还促使黄长石的结晶，这是TiO〓提高含氟熔渣熔化性温度的根本原因。

For Teflon PCB, pyrolysis gas contained high concentration of octafluoro- cyclobutane and low concentration of small molecular fluorocarbon-hydrogen compounds.

Teflon热解气体产物主要为八氟环丁烷以及其他小分子碳氟氢烷烃化合物。

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。