查询词典 reagent

Pilled rape-seed melted with seeds resist drought, the result showed that the effects of different resist drought reagent were difference on the growth and development and yield in rape.

利用抗旱剂对油菜种子进行丸粒化处理，田间试验研究结果表明：不同抗旱剂处理对油菜的生长发育、农艺性状及产量形成有不同程度的影响。

The aluminium powder has been used to reduce titanium tetrachloride to generate the low valent titanium reagent which can induce the reductive coupling of aldehydes and ketones to form the corresponding pinacol s.

以价廉易得的铝粉还原四氯化钛制得低价钛，将其用于醛酮还原偶联，合成了6种片呐醇，其中对称片呐醇4种，不对称片呐醇2种。

At the isoelectric point, pH=3.07, the flocculation effectsFentonof iron polysulfate , aluminium polychloride and chitosan chloride are compared . It is illustrated that the optical flocculation reagent is aluminium polychloride and its optical dosage is 0.30g per 50mL effluent.

在等电点pH=3.07处，对聚合硫酸铁、聚合氯化铝、壳聚糖盐酸盐的絮凝效果进行比较，确定了最佳絮凝剂为聚合氯化铝，最佳用量为每50mL处理液加入0.30g聚合氯化铝。

And a novel synthesis process of dimethyl carbonate from urea and methanol was proposed. Polyphosphoric acid is used as the catalyst and the coupling reagent in the process.

应用共生耦合理论对尿素醇解法制备碳酸二甲酯的合成反应体系进行了分析，提出了一种由尿素和甲醇制备碳酸二甲酯的新工艺。

The related feature of tribromide quaternary ammonium salt as selective bromide reagent was investigated by the reaction of acetophanone, propanone, phenol with self-made benzyl triethyl tribromide quaternary ammonium salt.

首次通过自制的苄基三乙基三溴季铵盐与苯乙酮、丙酮、苯酚等的反应，研究了三溴季铵盐作为选择性溴化剂的相关性能。

Propargyl alcohol was protected by dihydrophran with the catalysis of PPTS ,and then reacted with Ethyl Mag bromide to prepare its corresponding Grignard reagent.

炔丙醇在 PPTS 催化下由二氢吡喃保护，与溴乙烷格氏试剂反应生成相应的格氏试剂，然后与氯甲酸甲酯反应得到羟基丁炔酸甲酯四氢吡喃醚，在 PPTS 催化下脱保护后进行甲磺酰化，由溴化钠进行溴取代后合成了4-溴-2-丁炔酸甲酯，总收率达53%。

The main products are: chloride, polyacrylamide, ion exchange resins, protopine, three acid, filter, ferric chloride, ferrous sulfate, as well as the chemical reagent and so on.

主要产品有：聚合氯化铝、聚丙烯酰胺、离子交换树脂、片碱、三酸、、滤料、三氯化铁、硫酸亚铁、以及化学试剂等等。

The resin is prepared by swelling chlorine balls in a solvent such as nitrobenzene; adding catalyst to obtain polystyrene-divinylbenzene adsorptive resin; removing reaction mother solution; washing to remove residual solvent and catalyst; swelling; adding pyrane reagent to further react with chloromethyl residual on inner and outer surfaces of the resin to obtain the pyranyl modified adsorptive resin with the composite function.

该树脂的制备方法：将氯球溶胀于硝基苯等溶剂中，加入催化剂，得到聚苯乙烯-二乙烯苯吸附树脂；抽尽反应母液，洗去残留的溶剂和催化剂；溶胀，加入吡喃试剂与树脂内外表面残留氯甲基进一步反应，可制得吡喃基修饰复合功能吸附树脂。

A new corrosion inhibitor and Universal antibacterial reagent, namely, the copolymer of N-isopro-pylacrylamide and N-allyl-1-benzoyl-3-phenyl-4,5-dihydro-4-formamido pyrazole was prepared.

合成了一种新的腐蚀抑制及广谱抑菌剂：N-异丙基丙烯酰胺与N-烯丙基-1-苯甲酰基-3-苯基-4，5-2H-4甲酰胺基吡唑的共聚物PNIPAM-Co-PBPCP。

With the new synthesized fluorescence reagent, a novel fluorescence quenching method for determination of superoxide radical was developed by coupling the reaction of pyrogallic auto-oxidation reaction.

合成了一种新的荧光探针试剂香草醛缩苯胺，利用元素分析、红外光谱等手段对探针试剂进行结构表征；结合部苯三酚的自氧化作用，建立了一种荧光法测定超氧阴离子自由基O2

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。