醚的

Kdr resistance and determination of frequences of kdr gene in house fly field population L1014F is the most common amino acid substitution in the kdr allele. The frequency of the L1014F kdr allele was determined by the method of PASA in fourteen field populations of houseflies with resistance factors at LD〓 for pyrethrin/ piperonyl butoxide and bioresmethrin/piperonyl butoxide from 4 to 29 and 2 to 98, respectively.

击倒抗性及kdr基因频率在家蝇野生种群中的检测 L1014F是击倒抗性等位基因最常见的突变位点。14个家蝇种群对除虫菊酯／胡椒基丁醚和苄呋菊酯／胡椒基丁醚的LD〓抗性倍数分别为4到29和2至98。

The terminal allylation reaction was studied which was influenced by reaction time, reaction temperature, category and dosage of allylation reagent and molecular weight of polyether.

其次对双羟基聚醚的端烯丙基化反应进行研究，讨论了反应时间、反应温度、聚醚分子量、烯丙基化试剂的种类和用量对反应的影响。

Additionally, the synthesisof the key intermediates, cinnamyl aryl ethers was made an investigation andstudy. This improved synthetic method for cinnamyl aryl ethers may be alsoapplied to many benzofuranoid neolignans precursors.

此外，对关键中间体桂皮基芳香醚的合成进行了较为深入的研究，改良的成醚法可适用于许多苯骈呋喃类新木脂素前体的合成。

Similar responses were obtained in decerebrate, isoflurane-freerats administered etomidate and in isoflurane-anesthetized ratsadministered propofol.

在去大脑、给予依托咪酯未用异氟醚的大鼠或给予异丙酚的异氟醚麻醉大鼠，也可以记录到相似的反应。

This paper studied two new processes for catalytic synthesis of decabromodiphenyl ether which were carried out distinguishingly by brominating diphenyl oxide with bromine and bromine chloride in the presence of a novel metal catalyst.

本文研究了采用新型金属型催化剂催化合成十溴二苯醚的溴素法和氯化溴法两种新工艺；利用均匀实验设计和单纯形优化试验技术对两种新工艺的工艺条件进行了优化研究，分别确定了两种工艺路线的最佳工艺条件；通过筛选，确定了一种十溴二苯醚的精制新工艺。

Now, a convenient, efficient pinacol coupling of aldehydes mediated by zinc in good yields has been carried out in ammonia water in the presence of a little crown ether. Adding a small amount of crown ether was highly effective to enhance the yields of pinacol from 63% to 84%.

本文报道一种简便、有效的水相呐偶合反应，它是在含有少量冠醚的稀氨水溶液中，使用锌粉促进醛基化合物进行水相呐偶合反应，其中加入少量的冠醚有助于提高反应的产率，呐醇产率由63%提高到84%。

In this project, we have prepared conveniently Si-Mg 1,1-difunctional group reagents-α-silylvinyl Grignard reagents by hydromagnesiation of alkynylsilanes; Se-Br 1,1-difunctional group reagents-α-bromovinylselenides by hydrobromination of alkynylselenides; Sn-Br and Sn-I 1,1-difunctional group reagents by hydrozirconation of alkynylstannanes followed by halogenating reaction.

本项目通过炔基硅烷的镁氢化反应，方便地制得了Si-Mg 1，1-双官能团试剂-α-硅基烯基镁化物；通过炔基硒醚的溴氢化反应，方便地制得了Se-Br 1，1-双官能试剂-α-溴代烯基硒醚；通过炔基锡烷的锆氢化反应，继而卤代方便地制得了Sn-Br和Sn-I 1，1-双官能试剂。

The synthetic technique of anionic surfactant sodium dodecyl diphenyl ether disulfonate was studied.The best reaction conditions were determined.Alkylation was carried out with n∶ n=5∶1 at 70 ℃ for 5 h to attain 82% yield.

研究了十二烷基二苯醚二磺酸钠阴离子表面活性剂的合成工艺，得出烷基化的最佳反应条件为：催化剂用量为n∶n =5∶1；反应时间 5h ；反应温度 70℃；二苯醚的转化率 82 %。

The result showed that chromatogram peaks were summated,peak area increased and two new peaks were found.It suggested that the composition dissolution of RP was increased with the addition of RAT,chemical changes may be occurred after compatibility. Established the HPLC analysis method forα-asarone in RAT and researched the content change ofα-asarone after compatibility.

发现配伍后色谱峰具有加和性，峰面积增加，有两个新峰产生，提示石菖蒲能使远志中的化学成分溶出度增加，两药配伍后可能发生了复杂的化学变化；建立石菖蒲中α-细辛醚的HPLC分析方法，研究配伍远志后α-细辛醚的含量变化。

Firstly, Vinyl ethers were prepared in a one-pot, two-step transformation by O-alkylation reaction of 2-hydroxyalkyl phenyl selenides with primary or secondary organic halides followed by oxidation-elimination with 30 % hydrogen peroxide.

1.2-羟基烷基苯基硒醚和伯、仲卤代烃通过O-烷基化反应，然后用30％的双氧水进行氧化消除反应，提供了&两步、一锅法&合成烯基醚的新方法，该方法反应条件温和，操作简便，产物收率中等到良好(70-85％)。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。