查询词典 reagents

The auxiliary can be recovered in high yield (81%) only by filtering and recrystallization. Besides, some other aldehydes have been chosen to test the enantioselectivity of N,N\'-dibenzyl tartamide, in comparison with two other allylaborates reagents developed previously by Roush and Brown, respectively. The results show that %e.e. of homoallylic alcohol is superior to that of the former, and approaches the Brown reagent.

产物经S_N2反应得瑞格列萘中间体-甲基烯丙基-2-氯苯基-叠氮甲烷(17)；同时，将筛选出的新型手性配体N-苄基酒石酸二酰胺用于其他几种醛(正丁醛，异戊醛和环己醛)的不对称烯丙基化反应，并与广泛应用的Roush配体(22)和Brown配体(27)相比较，发现其立体选择性优于Roush配体，并接近Brown配体，但明显具有可回收利用的优势。

The opti mumreagent,which was selected out through comparing the staining effects of 4 staining reagents(I-IK coloration solution,improved phenol fuchsin,safranine staining solution and aceto carmine),was i mproved phenol fuchsin.

通过比较4种染色试剂(I-IK染液、改良苯酚品红、番红染液和醋酸洋红)的染色效果选出的最佳试剂为改良苯酚品红。

Mixing reagents of lemongrass and sweet basil oil, santolina and lemongrass oil, have prominent repellency against mosquitoes.

柠檬草和甜罗勒、柠檬草和银灰菊两组混合精油试剂的驱蚊效果极强。

Organosilane protective reagents widely used in the organic synthesis,especially in the synthesis of medicine、 pesticide and savageness production.

有机硅保护剂广泛地应用于有机合成中，特别是在医药、农药和天然产物的合成中大量的应用。

Methods Quality control sera with low, medium and high determined values were prepared and tested with a set of SCAg reagents for 20 batches and times.

制备质量控制低、中、高3种定值血清，用SCAg试剂经20批次测定绘制质控图，按WHO评价标准判断可信度；用批量QC血清插入血吸虫病现场与普查的样本中用SCAg试剂检测，在流行区实验室间进行单盲测试；对不同感染程度的血吸虫病流行区及非流行区采集的未知样本的EQA批量检测；用急性感染血清观察SCAg试剂检测的Hook效应。

Objective To establish a set of integrate criterion of quality control and critical quality control methods through the study of external quality assessment of reagents for detection of schistosome circulating antigen.

目的 通过血吸虫循环抗原试剂的外部质量控制研究，制定一套完整的质量控制指标和严格的质量控制措施。

More than is already the world's leading manufacturers of scientific instruments and reagents of the agent or the total distribution area.

目前已是多家世界著名的科学仪器和试剂厂商的地区代理或总经销。

Company the full implementation of "science and technology industries", the strategic principle of self-produced more than 20 kinds of reagents, product quality in line with national standards, are sold throughout the country.

公司全面实施"科技兴厂"的战略方针，自产试剂二十多种，产品质量符合国家标准，销往全国各地。

The reagents, techniques and mechanism of preparing the silver chloride {100} tabular grain emulsion and its chemical sensitization, its optical sensitization and wide applications are reviewed...

本文综述了高氯化银{100}面T-颗粒乳剂的制备原料、制备工艺过程、化学增感、光谱增感及该乳剂的应用前景。

Firstly, the sisal fiber surface is modified by chemical method, the influence of the kinds and amounts of modified reagents are investigated.

首先，通过化学方法对天然剑麻纤维进行了表面改性处理，考察了改性用的偶联剂种类以及其对纤维改性效果的影响。

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。