查询词典 chemical synthesis

Polyaspartate can also be obtained through chemical synthesis, but is currently produced only in small quantities. It is more biodegradable than comparable polyacrylates, but not totally biodegradable like the polyaspartate produced in cyanophycin.

聚天冬氨酸也可以通过化学方法合成，但是，目前只能少量生产，其生物降解性比聚丙烯酸酯更好，但不能够像蓝细菌中产生的聚天冬氨酸那样完全被生物降解。

It is certain that fermentative processes replace chemical synthesis as xylitol production.

用发酵法取代化学法生产木糖醇是必然的趋势。

Chemical synthesis and fermentive method is the major industrial way to produce DHS, and microbial rational modification based on the development of metabolic engineering made the fermentive method more widely used.

工业上一般采用化学合成法和发酵法来生产3-脱氢莽草酸，随着代谢工程的兴起，使得更加理性改造菌株成为可能，这更加促进了发酵法的广泛应用。

A number of chemical synthesis techniques have been reported to yield pure homogen...

近些年报道了大量均一、纯相PZT粉末的化学合成技术。

The progress on chemical synthesis and biosynthesis of levulinic acid and 5-aminolevulinic acid(5-ALA) were discussed.

基于生物质资源的利用和开发，论述了乙酰丙酸的制取、5-氨基乙酰丙酸的化学合成与生物合成，阐述了其在医药、农业等方面的应用，讨论了发展趋势和亟待解决的问题。

The cDNA squence of antibiotic, an antibacterial peptide, a process for preparing the said cDNA and a process for recombining the antibacterial peptide are disclosed. The present frequency of amino acid codens in Attacin A cDNA is analyzed. The high-frequency coden is introdued to its protein sequence to configure its cDNA sequence. The target gene is synthesized by chemical synthesis method or polymerase chain reaction.

本发明公开了葛佬素的cDNA序列，葛佬素cDNA的制备方法以及重组抗菌肽葛佬素的制备方法；通过对同种已知蛋白质Attacin A cDNA中氨基酸密码子的出现频度进行分析，采用出现频度高的密码子带入葛佬素蛋白质序列中进行葛佬素的cDNA序列构建，用化学合成法及聚合酶链式反应进行目的基因的合成，另外，采用基因重组法制备抗菌肽葛佬素，并测定了其活性。

Oil-soluble Ag2S nanoparticles surface-modified by dialkyldithiophosphate were prepared by chemical synthesis.The synthesized Ag2S nanoparticles were characterized by transmission electron microscopy,X-ray powder diffraction spectroscope and UV-vis spectrophotometer.The friction and wear tests were carried out by a DF-PM dynamic and static friction tester.

在水醇混合介质中，采用同阳离子共沉淀法合成了有机化合物表面修饰的Ag2S纳米微粒，在高速钢基底上制备成膜，研究了它的摩擦学特性。

Clinical translation of this approach will require chimeras that are effective when administered systemically and are amenable to chemical synthesis.

但是要成功地将siRNA传送到特异性的细胞中而不对其它细胞产生不利影响还一直是个难题。

Some compounds possessing chiral center themselves may be racemates and appear racemic phenomenon in the extraction and separation from medicine herbs, structure modification and chemical synthesis.

但是，由于含有手性中心的中药有效成分本身可能是消旋体、或者在分离提取、结构改造及化学合成时会出现外消旋化现象，使新药研制与开发中面临对映体成分的分离制备、体内手性药物分析及对映体特异性药代动力学研究等重大难题。

Liberal arts classes in which specialized basic courses is "a comprehensive history and geography,", science-based specialty classes are "physical and chemical synthesis"; if the candidates registered for the Top-level, no matter what their choice of professional, all three exam subjects, including politics and foreign language is a public class, then according to their respective disciplines re-enrollment professional to determine a specialized basic courses.

其中文科类专业基础课是&历史和地理综合&，理科类专业基础课是&物理和化学综合&；如果考生报考了专升本层次，无论其选择哪个专业，统考科目都是3门，其中政治和外语是公共课，而后根据招生专业所属学科门类再确定1门专业基础课。

It has been put forward that there exists single Ball point and double Ball points on the symmetrical connecting-rod curves of equilateral mechanisms.

从鲍尔点的形成原理出发，分析对称连杆曲线上鲍尔点的产生条件，提出等边机构的对称连杆曲线上有单鲍尔点和双鲍尔点。

The factory affiliated to the Group primarily manufactures multiple-purpose pincers, baking kits, knives, scissors, kitchenware, gardening tools and beauty care kits as well as other hardware tools, the annual production value of which reaches US$ 30 million dollars.

集团所属工厂主要生产多用钳、烤具、刀具、剪刀、厨具、花园工具、美容套等五金产品，年生产总值3000万美元，产品价廉物美、选料上乘、质量保证，深受国内外客户的青睐