查询词典 reagent

Taking refined konjak powder as raw material, taking the mixture of NaH2PO4 and Na2HPO4 as phosphate esterification reagent, the konjac glucomannan phosphate ester was prepared under the dry condition, and the optimal process of konjac glucomannan phosphate ester was optimized by orthogonal test method.

方法］以细化的魔芋粉为原料，以NaH2PO4和Na2HPO4混合物为磷酸酯化试剂，在干法条件下，制备魔芋葡甘聚糖磷酸酯，并采用正交试验法优化魔芋葡甘聚糖磷酸酯最佳工艺。

Deficiencies of this test include: fresh samples free of oxidized flavor frequently develop some color upon reaction with the Kreis reagent, and consistent results among different laboratories are difficult to obtain.

这个试验的不足是：(1)无氧化味的新鲜样品经常与kreis试剂反应产生一些颜色，(2)在不同的试验室难以得到相同的结果。

On the other hand, reaction of lactol derived from D-mannose and D-glucose with Grinard reagent of propargyl bromide also proceed both withanti stereoselectivity and with high anti-specificity.

链增长及目标分子中的碳碳双键是由一步Wittig反应和一步末端炔的烷基化再部分氢化而获得，双键构型-选择性可达到95％以上。

A one-pot chemoselective reduction and lactonization of(4S,5R)-hemiesters was carried out to afford high-yielding(3aS,6aR)-lactone,a key chiral building block for the biotin synthesis. One-step introduction of carboxybutyl chain onto(3aS,6aR)-thiolactone was reached upon treatment of zinc reagent 25 in the presence of nanopalladium via an improved Fukuyama coupling under mild reaction conditions.

在侧链引入过程中，采用纳米钯LDH-Pd~0为催化剂以改进的Fukuyama偶联反应一步高效地引入-生物素五碳羧酸侧链，紧接着创造性地以离子氢化的方式建立了-生物素的第三个手性中心。

Total RNA was extracted from Alopex lagopus spleen using Trizol reagent. A full length cDNA library was constructed using SMARTTM cDNA library Construction Kit.

用Trizol试剂提取蓝狐脾脏总RNA，用SMART cDNA文库构建试剂盒构建全长cDNA文库。

The results show that temperature does not have a significant impact on derivatization reaction; the derivatives are rapid degraded in sun light; the derivatization reaction is inhibited when the derivatization reagent is at high concentration; the reaction to produce the fluorescent derivatives is finished in 30 min, and the derivatives are stable for about 8 h at normal temperature and lightless.

研究结果表明，环境温度对衍生反应影响不显著；衍生反应对太阳光线敏感，其机理是阿维菌素衍生产物易快速发生光解；高浓度的衍生试剂对反应表现一定抑制作用；衍生反应在30min左右达到峰值，其产物在室温、避光条件下8h内保持稳定。

We may lixiviate the Ti, Si and Al with water as separation reagent in the room temperature.

浸取试验研究表明：室温水浸即可实现渣钛分离。

The apparent density increased with the increase of Ag~+ complexing reagent A concentration, loadage, silver content and granularity, it firstly increased and then decreased with the increase of Cu/Ag ration, and it had no relation to other factors, and it was 1.3-1.4g/cm~3 usually.

3粉体的松装密度随Ag~+络合剂A浓度、装载量、含银量、粉体粒度的增加逐渐变大，随Cu/Ag比的增加先变大后变小，其它因素对松装密度都无明显的影响，均保持在1.3-1.4g/cm~3。

The results as fallows:(1) The color became dark with the increase of NaOH~* concentration, Cu~(2+) concentration and loadage, it became light with the increase of silver content, NH_3·H_2O concentration, Ag~+ complexing reagent A concentration, Cu/Ag ration and granularity, and it firstly became light and then became dark with the increase of NaOH concentration.

具体结果如下：(1)镀银铝粉的颜色随NaOH~*浓度、Cu~(2+)浓度、装载量的增加逐渐变深，随含银量、NH_3·H_2O浓度、Ag~+络合剂A浓度、Cu/Ag比、粉体粒度的增加变浅，随NaOH浓度的增加先变浅后变深。

The influence of NaOH~* concentration, Cu~(2+) concentration, NH_3·H_2O concentration, Cu/Ag ration, Ag~+ complexing reagent A concentration, NaOH concentration, loadage, silver content and granularity on the color, compact resistance, apparent density and anti-oxidation property of silver coated aluminum powder and silver plating time were studied by condition experiment.

通过条件实验，我们探讨了NaOH~*浓度、Cu~(2+)浓度、NH_3·H_2O浓度、Cu、Ag比、Ag~+络合剂A浓度、NaOH浓度、装载量、含银量、粉体粒度对镀银铝粉颜色、松装密度、压实电阻、抗氧化性及镀银时间的影响。

Singer Leona Lewis and former Led Zeppelin guitarist Jimmy Page emerged as the bus transformed into a grass-covered carnival float, and the pair combined for a rendition of "Whole Lotta Love".

歌手leona刘易斯和前率领的飞艇的吉他手吉米页出现巴士转化为基层所涵盖的嘉年华花车，和一双合并为一移交&整个lotta爱&。

This is Kate, and that's Erin.

这是凯特，那个是爱朗。