查询词典 p-phthalic acid

Experiments were carried out with four familiar cultivating modes of tea gardens which were simple tea garden,greenhouse tea garden,Pine-tea intercrop tea garden and trees surrounding tea garden,to determine the ecological environment factors of tea gardens(including microclimatic factors and soil factors) and tea biochemical indicatorsincluding amino acid,caffeine,tea polyphenol,P.

对陕南茶区的纯茶园、塑料大棚茶园、松茶间作茶园及林篱茶园4种常见栽培模式的茶园生态环境(包括小气候因子、土壤因子)和茶叶中各项生化指标(包括氨基酸、咖啡碱、茶多酚、酚氨比、茶水浸出物)进行了测定。

Antioxidant 2,2′-methylene-bis(4-ethyl-6-tert-butylphenol) is synthesized by condensation of formalin and 4-ethyl-2-tert-butylphenol which is prepared by alkylation of p-ethylphenol with isobutylene in the presence of phosphoric acid or ion-exchange resin as catalysts.

研究了以对乙基苯酚、叔丁醇为原料，在酸性条件下，进行烷基化反应，合成2 叔丁基 4 乙基苯酚，再进一步缩合成抗氧剂425的工艺条件。

They were recovered f rom the ion exchange bed by dilute HCl and , final2 ly , were replaced in the spent HCl by Al to form valuable water t reatment coagulant and recycleable metals. The effects of resin types , flow rate and flow pattern on the IX t reatment and regeneration were determined. Using 0. 2 M citric acid at p H of 3. 0 , more than 90 % of the heavy...

经柠檬酸处理后，污泥中90%以上的重金属被去除；柠檬酸处理液中的重金属用离子交换法回收，考察了树脂种类、流速、操作方式等因素对离子交换、再生效果的影响；在适宜工艺条件下，重金属的交换率均为100%，而洗脱率均接近90%；柠檬酸及离子交换树脂循环使用，重金属也得到回收，降低了处理成本。

The results indicated that organic acids, except malic acid, had significant influence on available P.

结果表明，有机酸引起速效磷含量增多，除苹果酸处理的变化较小外，草酸和柠檬酸的加入使土壤中速效磷显著增加。

Using the modified electron beam exposure system, we have studied the exposure and developing characteristics of two kinds of resists, which are sensitive for electron beams, polymethylmethacrylate and the copolymer of methylmethacrylate and methacrylic acid P

另外在电镜原有的集成电路试样观察座上设计加工了一个可360°旋转的载物台，载物台X、Y方向移动分辨率为1μm，这样，通过控制工件台和电子束的移动即可实现精密的套刻。

The results showed that the adsorption capacity of p-xylene on Calgon AC was more than that of acetate acid while methyl acetate was the least.

文中对双组分体系在Calgon活性炭上的竞争吸附也做了研究，结果显示对二甲苯的吸附能力最强，醋酸次之，醋酸甲酯的吸附能力最弱。

A new spectrophotometric method for the determination of chromium has been developed. In HCl medium, the chromium oxidizes hydroxylammonium chloride to form nitrite, which produces a pink azo dye when reacting with p-aminobenzene sulfonic acid and α-naphthylamine.

基于铬在稀盐酸介质中氧化盐酸羟胺产生亚硝酸根，而亚硝酸根与对氨基苯磺酸重氮化后可与α-萘胺偶联产生粉红色偶氮染料，提出了分光光度法测定铬的新方法。

In this dissertation, the liquid phase oxidant of p-nitrotoluene and 2,4-dimethylnitrobenzene with oxygen/air to aromatic acid was discussed.

论文研究了氧气液相氧化对硝基甲苯、2，4-二甲基硝基苯制取对硝基苯甲酸、3-甲基-4-硝基苯甲酸的反应。

The direct oxidation of p-cymene in acetic acid by oxygen was catalyzed by cobalt catalyst system.

研究了在以冰醋酸为溶剂，以醋酸钴为催化剂条件下，原料配比、温度、压力等工艺条件对对异丙基甲苯氧化性能的影响。

Given the known reaction mechanism and general chemical considerations, we propose that nicotine, when used as the carbon source by P. putida J5, is catabolized to pyruvic acid via pyrrolidine pathway and then participates in the synthesis of vitamin pantothenate and CoA, which supply the energy for the normal functioning.

通过对突变位点基因的功能分析推测，假单胞杆菌可以将尼古丁代谢为2，5-二羟基吡啶，而2，5-二羟基吡啶可以进一步转化为丁烯二酸和丙酮酸，进而参与了泛酸和 CoA 的合成，为生理代谢提供基质。

This one mode pays close attention to network credence foundation of the businessman very much.

这一模式非常关注商人的网络信用基础。

Cell morphology of bacterial ghost of Pasteurella multocida was observed by scanning electron microscopy and inactivation ratio was estimated by CFU analysi.

扫描电镜观察多杀性巴氏杆菌细菌幽灵和菌落形成单位评价遗传灭活率。