查询词典 urea

Leuco crystal violet lactone was prepared by heating the mixture of dimethylaniline, p-dimethylaminobenzaldehyde and m-dimethylaminobenzoic acid at 60℃ for 5 hours in presence of hydrochloric acid and urea and in the nitrogen atmosphere with 72%yield of LCVL.

等摩尔比的N，N-二甲基苯胺和对二甲氨基苯甲醛在盐酸和脲的存在及氮气保护下，80℃反应0.5h，加入间二甲氨基苯甲酸于90℃反应5h。将反应混合物中和，抽滤，得到无色结晶紫内酯，产率为72%。

Experimental results of pyrolyzing urea with several solvents(adipic dinitrile, dodecyl benzene, silicone oil-705, silicone oil-210-50) in liquid phase are reported and discussed.

本文在讨论液相法合成氰尿酸时报道了尿素在几种不同溶剂─—己二腈，十二烷基苯，硅油DC－705，硅油210－50中裂解的实验结果。

Urea ; cyanuric acid ; pyrolysis ; dodecyl benzene ; silicone oil / adipic dinitrile

尿素；氰尿酸；热解；硅油／己二腈；十二烷基苯

Being Compared contact angle changes of various adhesives on different surface of Moso bamboo and Chinese fir with the coefficients of penetrability, it was found that wettiability of polymeric diphenylmethane diisocyanate adhesive was much better than emulsion polymer isocyanate adhesive, wettiability of phenol-formaldehyde adhesive and urea-formaldehyde adhesive were in the middle of above two adhesives.

通过研究不同胶粘剂在毛竹表面的接触角变化，并结合胶粘剂渗透扩散系数，发现聚异氰酸酯胶在竹材表面的润湿性较好，而双组分乳液型聚异氰酸酯胶的表面润湿性较差，酚醛树脂胶和脲醛树脂胶润湿能力处于二者中间。

The recent advances in the main clean processes to synthesize diphenylmethane diisocyanates are reviewed, such as BTC method, condensation of aniline, reductive carbonylation of nitrobenzene, oxidative carbonylation of aniline, methoxycarbonylation of aniline, alcoholysis of N,N'-diphenyl urea and the coupling process.

回顾了清洁合成二苯甲烷二异氰酸酯的几种主要方法，如BTC法、苯胺缩和法、硝基苯还原羰基化法、苯胺氧化羰基化法、碳酸酯法、二苯基脲法和反应耦合法等合成路线。

A type of chiral molecular tweezers has been designed and synthesized by using diphenic acid as spacer and chiral unsymmetrically disubstituted urea as arm for the first time.

近年来，利用合成的人工受体与适当底物间的分子识别以建立仿生仿酶模型的研究，已成为生物有机化学和超分子化学前沿领域之一lL】。2 J。

An amide herbicide butachlor treated with its mixture of urea at the emergence of barnyardgrass Echinochloa crus galli

酰胺类除草剂丁草胺+尿素混剂在无芒稗Echinochloa crusgalli

This method permits a clearresolution in which of the three steps of urea denaturation is an electrochemically relatedone.

结果证实了利用平衡滴定技术得到的三步变性过程，而且可以清楚地分辨其中相应的电化学活性步骤。

Polyunsaturated fatty acid of Elsholtzia rugulosa seed oil were enriched by urea inclusion method.

应用尿素包合技术对野香籽油中不饱和脂肪酸进行了富集，通过正交实验(L934)考察了尿素在乙醇中质量浓度、脂肪酸与的质量比、时间及温度等因素对不饱和脂肪酸提取率的影响。

It has no apparent influence toward blood pressure,conventional blood examination,conventional urea-examination,conventional excrementitious examination,liver function (transfer ammonia-lyase,total bilirubin,white protein) and kidney function.It shows no obvious poisonous side effect in clinical experiments.

培元通脑胶囊对血压、血常规、尿常规、粪常规、肝功能(转氨酶、总胆红素、白蛋白)、肾功能、心电图等均无明显影响，在临床试验中亦未出现明显的毒副反映。

Do you know, i need you to come back

你知道吗，我需要你回来

Yang yinshu、Wang xiangsheng、Li decang,The first discovery of haemaphysalis conicinna.

1〕 杨银书，王祥生，李德昌。安徽省首次发现嗜群血蜱。