脲

It was demonstrated that DPU itself acted as a kind of cytokinin in delaying senescence. However, it also postponed the decline of endogenous cytokinins of half-fronds.

实验结果表明，二苯脲本身具有细胞分裂素的活性，能代替内源细胞分裂素起到抗衰老的作用；二苯脲同时也能推迟半叶状体中内源细胞分裂素含量的降低。

This equation was tested by the renaturation processes of denatured egg white lysozyme in guanidine hydrochloride and urea solutions, with the results to show that when guanidine hydrochloride and urea concentrations were separately higher than 1.25 and 3.00 mol/L or separately lower than 1.00 and 3.00 mol/L, the refolding intermediates of egg white lysozymes were more easily aggregated to aggregate state or more easily renatured to native state, respectively.

以蛋白溶菌酶在盐酸胍和脲溶液中的复性过程对此关系进行了验证，结果表明，当溶液中盐酸胍和脲浓度分别大于1.25 mol/l和3.0 mol/l或分别小于1.0 mol/l和3.0 mol/l时，它们的折叠中间体分子分别更倾向于集聚成集聚体或更倾向于复性成原始态分子。

Methods: Cervical swabs taken from 98 sex workers, 261 gynecological physical check-up clients and 599 sexual transmitted infections clinic female outpatients were cultured using commercial selective medium. Some positive cultures were further, biotyped and serotyped by PCR. Cervical or urethral swabs taken from 80 sexual transmitted infections clinic outpatients were cultured.

对98例卖淫妇女、261例妇科体检病人以及599例性病门诊女性患者的宫颈涂片进行解脲脲原体的培养，部分培养阳性的标本用PCR的方法进行Uu生物分群，对生物1群阳性的标本进一步区分血清型，并对该流行病学资料进行了统计学分析。

The effects of both molar ratio between reactants and reaction temperature on the products were investigated.

考察了乙酸铅和硫脲的摩尔比以及反应温度对合成产物的影响，发现当乙酸铅和硫脲的摩尔比为1：1时，得到大量的PbS纳米棒束，并初步探讨了其形成机理。

Firstly, phenyliodine diacetate was immobilized to the 2% cross-linked polystyrene or the liner polystyrene resin. The more iodine the resin had, the lower conversion to phenyliodine diacetate. We made our endeavor to extend the range of useful application of polystyrene supported phenyliodine diacetate in organic synthesis:(1) the reagent was used as an effective reagent of carbonyl regeneration from oximes and semicarbazones of ketones.(2) the reagent was also applied to the synthesis of 1, 3, 4-oxadiazoles, 1, 3-disubstituted-2-pyrazoline, 2-arylbenzoxazole from aldehyde N-acylhydrazones, aldehyde hydoazones and phenolic Schiff's bases respectively.

首先，我们以2％交联的聚苯乙烯和线性的聚苯乙烯树脂为载体，制备了聚合物负载的二醋酸碘苯，通过研究发现：(1)聚苯乙烯二醋酸碘苯是酮肟、缩氨脲有效的去保护试剂，不仅芳香酮，脂肪酮和α，β不饱和酮的肟、缩氨脲也能顺利转化为相应的酮，实现酮基的再生；(2)我们还利用此试剂，分别与醛的N-酰基苯、N-酰基苯腙及邻羟基芳亚胺反应，在温和的条件下发生成环反应，以良好的产率生成1，3，4-噁二唑、吡唑啉和二取代苯并噁唑等杂环化合物；(3)聚苯乙烯二醋酸碘苯还可有效地将邻羟基芳酮的酰腙经氧化、重排成1，2-二酰基苯。

Modes of modification of urea-formaldehyde resin were listed.Their properties after were also studied.

列举了脲醛树脂常用的各种改性物质及它们对脲醛树脂各种性能的改性效果。

Effects of preparation technology of urea-formaldehyde resin modified with melamineon property of plywood were studied.

采用三聚氰胺对脲醛树脂进行改性，探讨了改性脲醛树脂的合成工艺对性能的影响。结果表明：当甲醛与尿素的最终摩尔比达到 1。

The materials are gold mine of low sulfur content, calcine or gold contain abatement. Cyanogens lixiviant is alkaline thiourea, stabilizer is sodium sulphite or sodium silicate, they constitute high stability alkaline thiourea system, and bland oxidizing agent is potassium ferricyanide with moderate electric potential during sunking process.

本发明以低硫含量的金矿、焙砂或含金废料为原料，以碱性硫脲为无毒的代氰浸出剂，以亚硫酸钠或硅酸钠为稳定剂，组成高稳定性碱性硫脲体系，浸出过程中以具有适中电势的铁氰化钾为温和氧化剂。

The polyurea coating was tested with Taber tribomachine and the highp ressure water jet erosion tester for studying the wear behavior of polyure coating under conditions of dry friction and highspeed water jet contained sand. The morphology of the coating was observed with SEM and Chromatic confocal 3D Profiler. The surface component of test samp les was measured by FT2IR Spectrometer and Electron Energy Disperse Spectroscopy. The p roperties of polyurea coating under two testing conditionswas analyzed.

为研究聚脲涂层在干摩擦条件下和高速含砂水流冲蚀条件下的性能变化情况，用 Taber 磨损试验机和高速含沙水射冲蚀磨损试验机测试了聚脲涂层的磨损性能，用扫描电子显微镜和白光共焦三维轮廓仪观测涂层的磨损表面形貌，用表面红外光谱和电子显微镜能谱元素分析了涂层表面试验前后的组分变化，分析了涂层在2种摩擦条件下的磨损情况。

The purity of the refolded rhIFN-γ was up to 90%, and high urea gradient length and moderate final urea concentration were favorable for the refolding process. Under optimum conditions, the specific activity of rhIFN-γ was up to 9.75×10^6IU/mg and protein recovery was up to 53.7%.

复性后的重组人γ-干扰素的纯度达90%；较长的脲梯度长度和合适的脲终浓度有利于蛋白质的复性；在较优的实验条件下，复性后的重组人γ-干扰素收率为53.7%，比活达9.75×10^6IU/mg。

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