糖

The connection mode of MOP was mainly that taking 1-4 glycosidic bond as the main chain and taking 1-6 glycosidic bond as the branched chain.

该糖的连接方式主要以1-4糖苷键连接为主链，1-6糖苷键连接为支链。

The major difficulty lies in the enormous variations of carbohydrate structures reflecting in the diverse glycosidic linkage patterns, stereochemistry and branching.

与之相反，复杂的糖分子及其体外合成的研究则进展缓慢，其主要困难在于糖链结构的多样性与复杂性，即糖苷键种类、立体结构及分枝的多样性与复杂性。

If all the glycosyl units are of the same sugar type, they are homogeneous as to monomer units and are called homoglycans.

如果所有糖单元都是相同类型的糖，对于单体糖元他们是均匀的，称同聚糖。

Glycosyl sulfides and glycosyl sulfoxides are useful synthetic intermediates or synthons.

糖基硫苷和糖基亚砜是寡糖合成中的重要中间体或合成子。

These results, together with the structural elucidation of the purified polysaccharides described above, indicate that the α-glucans in G. lucidum don't have any remarkable immunomdulating activities, but the effects of β-glucans on immune system depend on their glycosyl residue linkages and sugar chain conformation. Further, it is concluded that the 1, 3-linked backbone, relative lower side chain size and substitution, and a high-organized helical structure are the beneficial structural features for the immunostimulatory activity of β-D-glucans. However, the 1, 6-linked backbone may induce the immunosuppressive effect of β-D-glucans.

结合各纯化多糖的结构与构象分析的结果，可以得出以下结论：赤灵芝中的α-型葡取糖不具有显著的免疫调节作用，而β-型葡聚糖的免疫作用则与其糖链结构和糖链构象有密切关系，1，3-连接的主链，较低的分支取代率和较短的支链长度及高度有序的螺旋结构是β-型葡聚糖发挥免疫增强功能的有利结构因素，相反，1，6-连接的主链却可能引起多糖的免疫抑制作用。

L-fucose, as raw material, protected with ortho ester, synthesized the glycosyl acceptor 60, 76, thioglycoside doner 57、61、62, fluorglycoside 65、66 and Schimidt doner 68, 70 in a simple and efficient way.

本文从L-岩藻糖出发，以原酸酯保护的方法简单高效的合成了具有合适保护基的糖基受体60、76，糖基供体57、61、62、65、66、68及70。

Studies on four novel classes of glycosyl donors for the stereoselective synthesis of 2-S-2-deoxy-β-glycosides, via 1, 2-migration and concurrent glycosidation.

一、发展了四种糖基给体，通过硫的1，2—迁移，并同时进行糖苷化的方法，立体专一的合成了一些2位硫代β糖苷。

Several glycosyl phosphate and phosphonates, as inhibitors of AGPase, were synthesized.In the synthesis of β〓-6 linked oligosaccharide phosphonates, A new method was developedfor preparation of 〓,6-〓-di-acetyl-2,3,4-〓-tri-benzyl-D-hexoses by acetylation of benzylatedmethyl glycosides in high yield under the conditions of 〓 and cat.〓.

合成了一些磷酸酯及其类似物作为嗜热AGPase的抑制剂，在研究β 1-6连接的寡糖膦酸酯的合成中，发现了制备1，6-〓-二乙酰基-苄基保护糖的新方法：苄基保护的糖苷在醋酐和催化量的硫酸作用下，在0℃反应进行7-10 min，可以选择性、高收率地得到此化合物。

And physicochemical procedures (molecular weight measurement, viscosity analysis, etc.). All glycans (polysaccharides and peptidoglycan) were found as glucans, but each glucan has its specific sugar chain structure, including glycosyl reside linkages and sugar chain conformation.

结构研究表明，除PSG6为肽多糖以外，其他六个多糖均为由单一葡萄糖构成的葡聚糖，但各多糖在糖残基连接方式，糖苷键构型，支链的长度、取代度与在主链上的分布及糖链构象上有显著差异。

If the gum harmful to oral health lies in a "sugar" words, because sugar is one of the important factors caries and chewing gum, sugar in the mouth longer residence time. How do?

若说口香糖有害于口腔健康关键在一个&糖&字，因为糖是龋病的重要因素之一，而且咀嚼口香糖，糖在口腔内的停留时间也较长。

What would he tell Judith and the children?

他将怎样告诉朱迪丝和孩子们呢？

I this is at that time, the opinion with peacockish true girl is full of in a heart.

这就是当时的我，一个心中布满虚荣的女孩子真实的想法。