查询词典 acid value

The optimum hydrolytic condition for crude drug was: zymolysis at 39℃for 72 hours, hydrolysis at 90℃with 5% sulfuric acid for 6 hours under natural pressure; The reserved time of diosgenin was about 10 minutes under its chromatograms conditions, and the R-value between the main peak and the nearby peak was bigger than 2, which means reaching the standard of chromatograms separation.

生药材的最佳水解条件是：在39℃恒温箱中发酵72 h，加硫酸至5%，90℃水浴中常压水解6 h。

N-substituted pyrroles are synthesized by reacting acetonylacetone with carbamic ester , catalysted by p-toluenyl sulfonic acid, heated at reflux temperature for 6h, collecting evolved water, giving to 75% yields, which is 26% more than the literature value.

以对甲苯磺酸为催化剂，用甲苯作溶剂，使2，5-己二酮与氨基甲酸酯在110℃反应6h，合成了5种氮取代吡咯衍生物，其中两种未见文献报道，反应产率均达到75％以上，比文献值高出了26％。

Inspection-and-ink balance, acidometer respectively measuring the pH value, such as imbalance of acetic acid or base can be used in conciliation.

检验水墨平衡，用酸度计分别测其pH值，如不平衡可采用醋酸或碱进行调解之。

Adipic acid is a kind of chemicals with high technology content and added value.

己二酸是一个高技术含量、高附加值的化工产品。

The synthetic progress of polysuccinimide using maleic acid as original material was studied by two steps of aminization and polymerization. Changes of reactant and product composition in aminization reaction step was studied by using bromine value analysis method. It was found that amine salt and amide were main products in this step.

对以马来酐为原料合成聚琥珀酰亚胺的两个反应过程进行了研究，通过溴价测定法研究了胺化反应阶段反应物及产物各组分的变化情况，确定胺化反应阶段的产物组分主要是胺盐和酰胺。

The results show that the samples exposed to the air previously for 24 h can be passivated automatically in acetic acid solution with Cl- with the corrosion potential remaining 100mV.No such phenomenon was observed for samples which were cathodically polarized with the corrosion potential stabilizing at a value of -242±3mv. The passive film formed by anodically polarizing is more proof than formed in the air.

研究还发现：在空气中放置24小时后的试样在Cl-醋酸溶液中能自钝化，自腐蚀电位为100mv；经阴极极化后的试样在Cl-醋酸溶液中不能自钝化，其自腐蚀电位为-242±3mv；经阳极极化形成的钝化膜比在空气中自然形成的钝化膜更致密。

Uses the strong sulfuric acid anthrone determination kelp polysaccharide the content, mainly uses the single factor experiment definite orthogonal experiment, makes the microwave radiation time, the liquid-solid separately compared to, the ph value as well as the extraction temperature to the kelp polysaccharide extraction quantity influence, determines the best experimental condition again by the orthogonal experiment.

采用浓硫酸蒽酮测定海带多糖的含量，主要利用单因素试验确定正交实验，分别做出微波辐射时间、固液比、ph值以及提取温度对海带多糖提取量的影响，再以正交实验来测定最佳实验条件。

In order to investigate new methods to the detection of Mycobacterium tuberculosis and diagnostic value of FQ-PCR in the detection of DNA in Mycobacterium tuberculosis, FQ-PCR was used to detect DNA of Mycobacterium tuberculosis in body fluid from 68 patients with tuberculosis and 68 patients without tuberculosis and it was also compared with the two methods of smear acid-fast stainning and antituberculotic antibody.

为探讨结核分枝杆菌检测的新途径及其FQ-PCR技术在结核分枝杆菌DNA诊断中的实用价值，运用FQ-PCR技术对68例结核病患者和68例非结核病患者体液进行结核分枝杆菌DNA测定，并与涂片抗酸染色及ELISA—抗结核抗体法进行比较。

The effects of catalyst dosage, the amounts of hydrogen peroxide and phase transfer agent, the pH value of the solution, the reuse of catalyst and the reaction temperature on the azelaic acid yield were investigated.

以30%过氧化氢作为氧化剂，在相转移试剂和磷钨酸催化剂作用下催化油酸制备壬二酸，考察了催化剂磷钨酸用量、过氧化氢用量、溶液pH值、相转移试剂用量、反应温度等因素对壬二酸产率的影响。

The value of current density and the apparent active energy of electroreduction of substituted nitrobenzene depend on the electronic effect of substituted group and space resistance. o,m,p-chloronitrobenzene will be electroreduced to azoxy compounds by taking three electrons, o,m-nitrotoulene and o,m-nitrobenzoic acid will be reduced to phenol compounds by taking four electrons, and p-nitrotoulene will be reduced to the aniline by taking six electrons. According to these results, the electroreduction mechanism of the substituted aryl nitro-compounds was studied in detail.

在电还原过程中，还原峰电流和表观活化能的大小均与取代基的电子效应和空间位阻相关，同时取代硝基氯苯得3个电子将还原生成氧化偶氮苯类化合物：邻、间硝基甲苯、硝基苯甲酸得4个电子将还原生成酚类化合物；对硝基甲苯得6个电子将还原生成胺类化合物，在此基础上，探讨了各芳族硝基化合物的电还原机理。

Singer Leona Lewis and former Led Zeppelin guitarist Jimmy Page emerged as the bus transformed into a grass-covered carnival float, and the pair combined for a rendition of "Whole Lotta Love".

歌手leona刘易斯和前率领的飞艇的吉他手吉米页出现巴士转化为基层所涵盖的嘉年华花车，和一双合并为一移交&整个lotta爱&。

This is Kate, and that's Erin.

这是凯特，那个是爱朗。