中间体

Diphenyl carbonate is an important chemical intermediate, mainly used for polycarbonate in plastics industry.

碳酸二苯酯(Diphenyl Carbonate， DPC)是一种重要的化工原料中间体，主要用于塑料工业制造聚碳酸酯。

So it overcome the insufficiency of the one-time deplete of the already chloromethylation catalyst, which decreased its disserve to our entironment and realized the friendly entironmental chloromethylation.

与现有的催化剂不同，该催化体系含有一定量的水分，这样在反应过程中和反应结束后，都不会有大量的强致癌的中间体氯甲醚(来源：A27B9aC论文网www.abclunwen.com)的生成。

This method can be used not only in the preparation of ACEI medicine intermediates, but also as a kind of simple and important method in increasing dissymmetry carbon atom quantity and extending carbon chain.

本方法不但可以应用于ACEI类药物中间体的制备，而且是一种简单有效的增加不对称碳原子数量、延长碳链的重要方法。

The affections on the yield of DLLA caused by catalyst, temperature and time etc. were studied. By using ethylene glycol as diluent, the distillate temperature of DLLA was lowed and the carbonization phenomenon could be avoided, which caused the yield of DLLA increasing from 36.8% to 51.3%. The molecular weight of PDLLA prepared by this method could reach 184,000. DLLA and PDLLA was characterized and analyzed by DSC, XRD and IR.The key of direct method to synthesize PDLLA is the exclusion of H2O from reaction system.

丙交酯开环聚合制备PDLLA的关键在于中间体D，L-丙交酯的制备，研究了催化剂、反应温度、反应时间等因素对DLLA产率的影响，通过在反应体系中加入稀释剂乙二醇，DLLA的馏出温度明显降低，避免了DLLA在蒸馏过程中产生碳化现象，并使DLLA的平均产率由36.8％提高至51.3％，制备的PDLLA分子量最大值达18.4万。

The results showed that GFP gene and the synthetic dragline gene had integrated into the genomic DNA of silkworm and could be inherited.

由此，得到了GFP-蜘蛛拖牵丝融合基因转基因蚕，它能作为进一步用蛋白质工程改造蚕丝性能的中间体。

SDA has good sterilize ability,and when be applied in food, feed, fruit, vegetable, meat, egg.drink,it also has prevent moloy,antisepsis,keep fresh,prevent oxygenatiom,add nutrtion functions,and also can be widely applied as multivalent ion compound, well-prportioned matter and druggery intermediate.

双乙酸钠具有较强的杀真菌能力，用于食品、饲料、水果、蔬菜、肉类、禽蛋、饮料中，具有防毒、防腐、保鲜、抗氧化、调味、增加营养功能，并可作为多价离子蛰合剂、均化剂和药物中间体等被广泛应用。

Eastbound is a leading custom process development and custom manufacturing organization with its operations centered in Shanghai and surrounding areas.

Eastbound是一家为国外医药客户按需要进行工艺开发、优化和医药中间体生产的企业，在业内处于领先地位，Eastbound的运营集中在上海及周边地区，而客户均为欧美医药公司。

The potential intermediates of a series of electrophilic agents reacting with ethene have been computed with PM3 semiempirical method.

采用PM3方法计算了不同亲电试剂与乙烯生成的中间体正离子的势能曲线。

It was obtained with ethylenediamine and ethenesulfonic sodium as primary material through addition.

它是一种易降解的新型Gemini表面活性剂－N， N'-双癸酰基乙二胺二乙磺酸钠的中间体。

The reactions of ethylenedinitrourea with ethylenediamine or with polyether were studied.

根据乙撑二硝基脲降解生成乙撑二异氰酸酯中间体的性质，研究了它与乙二胺的反应，并进行了硝化反应研究。

Breath, muscle contraction of the buttocks; arch body, as far as possible to hold his head, right leg straight towards the ceiling (peg-leg knee in order to avoid muscle tension).

呼气，收缩臀部肌肉；拱起身体，尽量抬起头来，右腿伸直朝向天花板（膝微屈，以避免肌肉紧张）。

The cost of moving grain food products was unchanged from May, but year over year are up 8%.

粮食产品的运输费用与5月份相比没有变化，但却比去年同期高8％。