查询词典 n

Azoreductase in E.coli.JM-109 can damage -N=N- to decolorize azo dye. Decolonization conditions,such as dye categories,temperature,pH,salinity,oxygen were studied in this article.E.coli.

由于E。 coli JM-109含有的偶氮还原酶能破坏偶氮染料的-N=N-使其脱色，因此本文考察了其脱色的条件（温度，pH，盐度，供氧量）及其适用范围。

The azacrown ether complexes are formed by coordination of azacrown ether and metal ion, the azacrown ether is 1,12-diaza-3,4,9,10-dibenzo-5,8-diazacyclopentadecane-N,N'-diacetic acid, the metal ion can be any one of Cu2 , Ni2 , Co2 or Zn2 and so on.

所述氮杂冠醚配合物为氮杂冠醚与金属离子配位而成，氮杂冠醚为1，12-二氮杂-3，4，9，10-二苯并-5，8-二氮杂环十五烷-N，N'-二乙酸，所述金属离子可以为Cu 2 、Ni 2 、Co 2 或Zn 2 等中任一种。

STUDY ON THE STRUCTURE OF N,N DIALKYL LONG CHAIN ALKYLAMIDES AND THEIR EXTRACTION PERFORMANCE Ⅱ.

双取代长链烷基酰胺的结构与萃取性能的研究Ⅱ。N， N-二丁基烷基酰胺萃取铀和钍

After the oxidative polymerization of DMP,styrene was in-situ polymerized under the initiation of dibenzoyl peroxide and dicumyl peroxide,finally thermodynamically compatible PPO/PS alloy was prepared.When styrene content was 50 wt%,for the synthesized PPO/PS alloy the yield and the weight-average molecular weight were determined to be 95%and 1.7×10~5 for PPO,93%and 2.0×10~5 for PS,respectively.The influence of the concentration of DMP and catalyst,molar ratio of N/Cu, oxygen partial pressure,NaOH concentration and temperature on the initial polymerization rate(R_0) of DMP was studied.It was found that the initial polymerization rate of DMP increased with the concentration of DMP and catalyst. The initial polymerization rate increased with the molar ratio of N/Cu at first and then decreased.

通过测定DMP氧化聚合过程中氧气吸收量随时间的变化，研究了DMP和催化剂浓度、N/Cu摩尔比、氧气分压、氢氧化钠浓度及温度对水介质中DMP氧化聚合初始速率的影响，发现DMP氧化聚合初始速率与氧气分压的0.1次方成正比；DMP氧化聚合初始速率随DMP和催化剂浓度及温度的增加而增加；随氢氧化钠浓度和N/Cu摩尔比的增加DMP氧化聚合初始速率先增加后降低。

Double chain naphthyurea/thiourea piperazine derivatives complex with linear dicarboxylate anions with a high stability constant and 1∶1 stoichiometry of the complex-and the complex was formed through six hydrogen bonds.2 Photophysical behaviors and anion binding of three N,N-dimethylaminochalcone derivatives were studied.

二研究了三种N，N-二甲基氨基查耳酮衍生物的光物理行为及与阴离子的结合能力。4'位不同的取代基-氨基和苯脲基对查耳酮的的分子内电荷转移能力有一定的影响，它们减弱了查耳酮衍生物的分子内电荷转移能力，导致发射光谱蓝移。

Furthermore, seven compounds were isolated from CSPD and their chemical structures were authenticated by spectral analysis as tetrandrine, fangchinoline, tetrandrine-2′- N-β-oxide, tetrandrine-2′- N-α-oxide, dicentrine, dicentrinone, and adenine, respectively.

从粉防己专属性对照物质中分得粉防己碱、防己诺林碱、tetrandrine-2′- N-β-oxide，tetrandrine-2′- N-α-oxide，荷包牡丹碱、荷包牡丹酮和腺嘌呤等7个成分，经波谱分析鉴定了结构。

N,N-diethylaminopropylmethyldimethoxysilane was synthesized by taking γ-chloropropylmethyldimethoxysilane and diethylamine as raw materials in the process of amination .

以γ -氯丙基甲基二甲氧基硅烷和二乙胺为原料，经过胺化反应制得N N -二乙基-氨丙基甲基二甲氧基硅烷。

And then the intermolecular reductive cyclization reaction of N,N-diethyl-o-nitrobenzenesulfonamide with nitriles promoted by samarium diiodide was studied. 2H-1,2,4-Benzothiadiazine 1,1-Dioxides were prepared in good yields under mild and neutral conditions.

然后研究了二碘化钐促进的邻硝基N，N-二乙基苯磺酰胺与腈发生的分子间交叉还原偶联反应，一步合成了2H-1，2，4-苯并噻二嗪-1，1-二氧化物。

A kind of intramolecular charge transfer compound——3 methoxy 4' N,N dimethylamino flavone derivateves was used to detect collagen association in aqueous solution.

利用一种分子内电荷转移化合物3-甲氧基-4'N，N-二甲氨基黄酮作为荧光探针，研究了胶原蛋白在水溶液中的聚集状态。

As can be seen in Fig. 5, dipropyl ether will be recovered in the distillate using 1-pentanol, N,N-dimethylformamide and 2-ethoxyethanol as entrainers and butyl propionate is the only entrainer studied that inverts the volatility of the azeotropic mixture.

从图 5可以看出，使用1-戊醇、N，N-二甲基甲酰胺和2-乙氧基乙醇作为共溶剂时二丙醚将在馏分中回收，丙酸丁酯是唯一与共沸混合物挥发性相反的共溶剂。

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