查询词典 formaldehyde

Methods The total RNA of leucocyte was extracted 43 allergic vasculitis patients and 24 normal subjects before and after treatment with Trizol reagent and the integrity and concentrations of HLA-DRw53 gene mRNA were determined by agarose gel electrophoresis and UV spectrophotometer after denatured with 1% formaldehyde, the product was transcribed into complementary retroviral synthetic deoxyribonucleic acid, and sequence-specific primers were designed based on the sequences of second HLA-DRw53 gene exon and housekeeping gene glyceraldehyde phosphate-dehydrogenase cDNA.

利用随机引物逆转录合成互补脱氧核糖核酸，根据HLA-DRw53基因第二外显子序列和管家基因人磷酸甘油醛脱氢酶的cDNA序列设计序列特异性引物。检测43例变应性血管炎患者治疗前后与24名正常人HLA-DRw53基因mRNA表达量的变化。

The method to determine the content of free formaldehyde in Glycerol formal is established.

介绍了一种利用高效液相色谱法测定甘油缩甲醛中游离甲醛含量的方法。

The effect of different reaction conditions,such as catalyst concentration,molar ratio of reactants,reaction temperature,reaction time,on the coupling reaction of trioxane and methyl formate synthesizing methyl glycolate and methyl methoxy acetate using sulfuric acid as catalyst has been studied.Through the analysis for the yield of products and system pressure,and comparison with other different acidity catalysts,we considered that the activation of formaldehyde was the control step of reaction rate to the...

以硫酸为催化剂，研究了三聚甲醛与甲酸甲酯偶联合成乙醇酸甲酯和甲氧基乙酸甲酯的反应中，催化剂浓度、原料配比、反应温度、反应时间等条件对反应过程的影响，通过对产物收率和系统压力变化的分析，并结合与其它不同酸强度催化剂的对比，得到甲醛的活化是偶联反应的速率控制步骤，催化剂的酸强度决定其对甲醛的活化能力，是影响偶联反应的主要因素。

Other researchers also focused on mixing phenol and formaldehyde, which turned into a sticky mess of gunk.

其他研究人员还集中在混合苯酚和甲醛，但只弄得粘粘糊湖的一摊烂泥。

With the addition of hexamethylenetetramine, an ambient pressure drying technique was developed for the fabrication of resorcinol-formaldehyde-based carbon aerogels.

以间苯二酚和甲醛为反应物、六次甲基四胺HMTA为催化剂、去离子水为溶剂，所合成的间苯二酚－甲醛凝胶能够在常压条件下直接进行干燥得到有机气凝胶；并经炭化，得到炭气凝胶。

In order to expand the utilization fields of wood and decrease the costs of carbon fiber,carbon fiber precursor from liquefied wood was prepared by soaking liquefied wood in the solution of hydrochloric acid and formaldehyde,after melt-spinning by adding hexamethylenetetramine.

为了扩大木材的应用领域和降低碳纤维的成本，以木材液化物为原料，加入六次甲基四胺熔融纺丝，经甲醛和盐酸溶液固化处理后获得木材液化物碳纤维原丝，利用IR、XRD、拉曼光谱分析仪等初步揭示了木材液化物碳纤维原丝在炭化过程中微结构的变化。

The carbon fiber precursors were prepared from liquefied wood in phenol by adding hexamethylenetetramine and soaking in the solution containing hydrochloric acid and formaldehyde as the main components.

以木材苯酚液化物为原料，加入六次甲基四胺熔融纺丝后，经甲醛和盐酸溶液固化处理、炭化后得到木材液化物碳纤维。

Often referred to by the phenol or its homologue, and the role of formaldehyde derived liquid or solid products.

通常指由苯酚或其同系物和甲醛作用而得的液体或固体产品。

The material is readily prepared by reaction of formaldehyde and hydrazine.

这种物质很容易由甲醛和肼反应而得到。

Formaldehyde is absorbed by an acidic saturated solution of 2,4-dinitrophenyl hydrazine and converted to its hydrazone; the hydrazone is then extracted with CS2 and quantitated by GC.

利用尾气中的甲醛与2，4-二硝基苯肼酸性饱和溶液反应生成甲醛腙的特性，通过检测甲醛腙的浓度来检测尾气中的甲醛含量。

As a dominant party,CPC government should play a guardian,supervisee and guarantee role to overcome all the difficulties in the development of charitable cause and bring it into full play in the establishment of harmonious society on policies and regulations basis.

在中国共产党的文献中第一次把发展慈善事业提到&最广泛最充分地调动一切积极因素，不断提高构建社会主义和谐社会的能力&的高度来认识。近年来，社会学界对慈善事业的理论专著发表较多，有鉴于此，笔者不揣浅陋，谈谈自己的认识和见解。

Flow through the land, the land of the scale of operation allows the effectiveness of the land may be raised.

通过土地的流转，土地的规模经营可以让土地的效益得到提升。