脲

Firstly, cotton cellulose was basified and aged to alkali cellulose, then samples reacted with 3-Chloro-2-Hydroxypropylurea to produce 3-Creido-2-Hydroxypropyl cellulose.

将棉纤维进行碱化、老化处理，所得到的碱纤维再与中间体3-氯－2-羟丙基脲反应制得3-脲基－2-羟基丙基纤维素。

Bt toxin from Bt crops is introduced into soil primarily in root exudates and by incorporation of crop residues after harvest of the crop, with probably some input from pollen during tasseling, which probably have an effect on soil specific organisms, biodiversity and the functions of soil ecosystem.

而加有转Bt基因玉米农大61秸秆的土壤和加有常规玉米农大3138秸秆的土壤相比，土壤脱氢酶活性和土壤呼吸作用强度在秸秆分解期间都没有显著差异；秸秆分解了30d、45d、60d 时，显著提高了土壤蔗糖酶活性；分解了45d和90d时，显著提高了土壤酸性磷酸酶活性；30d时显著增加了土壤脲酶活性，而在45d时则显著降低了土壤脲酶活性；分解45d、60d、90d时显著降低了土壤蛋白酶活性。

Methods Physical examination was undertaken for all patients with vulvae itching and vaginal discharge.

对601例拟诊为下生殖道感染的女性患者和306例正常体检的女性进行临床检查，阴道分泌物的pH值检测，假丝酵母菌、滴虫检测，胺试验和线索细胞检查，同时采用荧光定量PCR测定解脲脲原体、淋球菌、沙眼衣原体。

The result showed that aging time of alkali cellulose should he 60℃, the preparation condition optimized of 3-ureido-2-hydroxypropyl cellulose should be the temperature of reaction at 60℃, reaction time 3.5-4h, the mass ratio of intermediate to cellulose should be 5, NaOH concentration should be 1 mol/L.

结果表明：棉纤维的老化时间为10 h，3-脲基－2-羟基丙基纤维素的制备工艺条件以温度60℃，m（3-氯－2-羟丙基脲）／m＝5，反应时间3.5~4 h，氢氧化钠的浓度以1 mol/L为宜。

The addition reaction with alkaline catalyst was used for the preparation of urea-formaldehyde prepolymer of rose perfume microcapsule.

以脲醛树脂为囊壁的玫瑰香精微胶囊，其囊壁原料脲-甲醛预聚体的制备，采用了碱催化下的加成反应工艺。

With a high accuracy, the biuret in compound fertilizer is determined from the color reaction between biuret and copper by copper double salt spectrophotometry, meanwhile the remove of PO43-,Ca2+, Mg2+and NH3 interferences is described without other and new interfering matters.

利用缩二脲铜的色泽反应，采用铜复盐分光光度法测定复合肥中的缩二脲，并介绍除去PO43-，Ca2+，Mg2+，NH3干扰的方法，并且在此过程中不能引入新的干扰物质。该方法精密度较好。

The 1-propanol/biuretium flour protein fractionation procedure based on the differential solubility of wheat flour protein in different aqueous solutions of 1-propanol yields three protein fractions, one monomeric in nature and two polymeric fractions corresponding to soluble glutenin, insoluble glutenin. Quantitative of the fraction was made with improved biuret reaction.

丙醇—双缩脲改良测定法用不同浓度的丙醇溶液将小麦面粉蛋白质分离为功能截然不同的单体蛋白、可溶性谷蛋白和不可溶性谷蛋白三部分，然后通过改良双缩脲测定法对不同组分进行定量分析。

The kinetics of soil urease differed with soil types. The urease in black soil and albic soil had larger values of Km and V than those in brown soil and cinnamon soil, but V/ Km had no significant differences, indicating that the kinetic parameters of soil urease were significantly influenced by soil type.

黑土和白浆土脲酶Km和V值比棕壤、褐土大，而V/Km的变化不明显，说明土壤类型对脲酶动力学参数有显著影响。

On the basis of the complex structures of AHAS and sulfonylureas inhibitors, systematic molecule docking study of five sulfonylureas inhibitors to AHAS were performed with autodock 3.0 package.

基于酵母乙酰羟酸合成酶与磺酰脲类抑制剂复合物的晶体结构，用分子对接方法对AHAS与5个磺酰脲类抑制剂相互作用的方式进行了系统的分子对接研究。

The nano-ionic liquid containing metal complex could be an effective catalyst for oxidative carbonylation of amines to carbamates and disubstituted ureas and for synthesis of unsymmetric ureas from amines and nitrobenzene, in which turn over frequencies exceeded 10000mol/mol/h.

以该系列纳米离子液体为催化剂高效的实现了胺类化合物催化氧化羰化制备氨基甲酸酯和二取代脲（转化频率＞10000mol/mol/h）以及胺与硝基苯通过一氧化碳羰化制备不对称脲的过程。

In the negative and interrogative forms, of course, this is identical to the non-emphatic forms.

。但是，在否定句或疑问句里，这种带有"do"的方法表达的效果却没有什么强调的意思。

Go down on one's knees;kneel down

屈膝跪下。。。下跪祈祷