链

The first step in the degradation is most probably the classical ester scission reaction to give a carboxylic acid and olefinic end groups. Further ester scission on the adjacent ester groups of carboxylic acid and olefinic molecular chains can then lead to the formation of lower weight pyrolytic products, such as: CH〓=CHOCOPhCOOCH=CH〓、CH〓=CHOCOPhCOOH and HOOCPhCOOH, and they can pyrolyze continually to produce substrate pyrolytic compounds, such as: HOOCPhCOCH〓、PhCOOH、PhH、PhCOCH〓 and CO、CO〓. At the same time, a corsslinking cyclization reaction occurred of the formation of the gas products during the degradation of PET.

断裂大分子链端邻近羰基和乙烯基的酯键持续断裂，不断地形成小分子裂解产物，如：CH〓=CHOCOPhCOOCH=CH〓、CH〓=CHOCOPhCOOH以及HOOCPhCOOH，这些产物还会进一步裂解成分子量更低的小分子裂解产物，如：HOOCPhCOCH〓、PhCOOH、PhH、PhCOCH〓以及CO、CO〓等，与此同时，一部分乙烯基酯端基的大分子链碎片会发生支化而相互连接，再经&链脱离&和环化反应形成难燃的交联产物。

The influence of chain extender kind, content and reactive processing condition on molecular weight (averageM(subscript η) of recycled PET was studied carefully based on chain extenders of 2, 2'-Bis(2-oxazoline), Pyromellitic dianhydride and the mixture of the both during reactive extrusion processing.

分别使用双恶唑啉、均苯四酐及两者的混合物作为回收PET瓶的扩链剂，研究扩链剂的种类、扩链剂用量和反应挤出机加工工艺条件对PET产品相对分子质量

It is the organic conformation of four levels of the degree of regional economies, of protection and restoration of regional ecology, of relativeness between regional economies and ecology, and of diffusion of pollution in regions that are the starting point and pathway to construct comprehensive evaluation system of the degree of harmony between regional economies and economy.

经济与生态和谐成长是当今世界不懈追求的永恒主题，是一个由一系列经济链与生态链以及经济与生态链环所构成的相互作用、相互影响、相互联动的庞大系统。构造区域经济与生态成长和谐度的综合评判体系，应当以区域经济成长度、区域生态保护与修复度、区域经济与生态关联度、周边区域生态污染扩散度四个层面的有机整合作为切入点和推动路径。

After summarizing several determination means of optimal purchasing quantity based on the traditional inventory control modes, the paper analyzes multiform means of ordering and discount pricing, develops several bi-level programming models to maximize the profit of supplier and the profit of purchaser separatively when wholesale unit price and retail unit price changing with order quantity and demand quantity changing with retail unit price, and then presents efficient solution.

接着从系统的观点，提出了供应链管理模式下企业采购组织系统的概念，深入剖析了各组成子系统的具体内容结构；并且从供应链管理流程的角度出发，指出了传统采购成本观念的不足，分析了供应链管理模式下的采购所有权总成本的观点。

Despite the fact that Korean bags are not so sool as Japnese ones, they are still quite in fashion, as some made in calico or in jeans will show.

韩国的配饰也很丰富，今年热门的是腰带和腰链，而金属链和一些金属彩色服品组合的腰链红得要命，搭配牛仔裤和裙子都很抢眼。

The experiment showed that the twin spirochaeta of PNA-DNA can quench the fluorescence of ST in some degree.And the fluorescence quenching of ST was reduced when PNA-DNA twin spirochaeta dissociate.

实验结果发现当 PNA- DNA杂交形成双链时，可以在一定程度上猝灭 ST的荧光，而当双螺旋解链时，对 ST荧光的猝灭程度减小，逐渐接近于 ST本身的荧光，根据荧光强度的变化研究了 PNA- DNA的杂交和解链过程。

Continuous determination of a polymer chain end group(initiating and chain growth species) at various times by electrospray ionization mass spectrometry indicates that the sterically hindered strong organic base predominately plays an initiator of polymer-chain growth in the copolymerization process.

利用飞行时间质谱对聚合物链端进行了跟踪检测，直接观察到了聚合反应的引发及链增长过程，证明大位阻有机碱在共聚反应过程中对聚合物的链增长起着重要的引发作用。

Beta-thalassemia major is a serious hereditary hemolytic anemia which does great harm to human being.It is a monogenic disease characterised by a reduced synthesis of beta-globin chains,which dues to the Doint mutation or deletion of beta-globin gene and its control region.It not only decreases the hemoglobin level,but breaks the balance of alpha/beta synthesis ratio.The major cellular pathogenetic mechanisms in beta thalassemia are based primarily on the deleterious effects produced by the accumulation of the excess alpha globin chain.These excess alpha-globin chains cannot form stable tetrameric structure and deposit in erythroid cells.They cause large ineffective erythropoiesis on their own,accelerate red cells destruction,and lead to hemolysis.

地中海贫血是一种对人类健康危害严重的遗传性溶血性贫血病，是因β-珠蛋白基因及其调控序列的点突变或缺失致使β-珠蛋白肽链合成减少或完全停止，这不仅使患者血红蛋白水平降低，而且使原来在数量上与之持平的α-珠蛋白肽链相对过剩，这些相对过剩的游离α-珠蛋白肽链并不能形成稳定的四聚体，它们沉积在红细胞中导致了大量无效红细胞生成和红细胞寿命缩短，引起了严重的溶血性贫血。

Through cyclic hydrogen bonding with motif formed by coordinated water molecules and coordinated hydroxyl groups of dhbd from adjacent tetranuclear units, these adjacent neighbors are connected to afford a 1D supramolecular chain along axis a, which is further extended via aromatic intercalations and other crystallization water molecules into a 3D structure with channels.

毗邻的四核单元通过配位H2O分子和配位羟基O原子形成的 R 22(8)型环形氢键桥的连接，沿a轴方向构建了四核单元交替相连的一维超分子链；链间籍苯环的π-π堆积作用和晶格水分子氢键链的连接进一步扩展为具有隧道的三维结构。

Mainly engaged in manufacture of various machine parts: Machine Tools Guide Shield, clothing cable sheath with catheter, engineering towline, aluminum trailers chain, APS towline, metal hose, work lights, protective kits, cooling, machine tools Sizing Block, groove board, aluminum blinds, electrical appliances, such as 30 years ago, that host more than 100 facilities and equipment manufacturers to provide a repair various specifications of products for CNC machine tools guide protection, research and development have made great contributions.

主要经营制造加工各种机床部件：机床导轨防护罩，穿线缆用导管护套，工程拖链，钢铝拖链，APS拖链，金属软管，工作灯，防护套，冷却管，机床垫铁，槽板，铝帘，起重电器等。30年来，以为100余家主机生产厂商配套及设备维修提供了各种规格的产品，为数控机床导轨防护，研制开发作出了很大的贡献。

The split between the two groups can hardly be papered over.

这两个团体间的分歧难以掩饰。

This approach not only encourages a greater number of responses, but minimizes the likelihood of stale groupthink.

这种做法不仅鼓励了更多的反应，而且减少跟风的可能性。