本论文研究了具有生物活性的芪类化合物的合成与结构修饰。
In this thesis, the synthesis and its structure modification of bioactive stilbenes have been studied.
多糖结构修饰能提高或赋予多糖活性、降低某些多糖的毒副作用。
Polysaccharide modification could increase its biological activity and decrease some side-effects.
目的：对天然五环三萜进行结构修饰，寻找新型糖原代谢调控药物。
Aim: to search for novel modulators of glycogen metabolism through structural modifications of natural pentacyclic triterpenes.
由于苦参碱是饱和的己内酰胺，要对其结构修饰，具有一定的难度。
It is difficult to be modified due to the saturated structure of Matrine.
目的：探讨岩白菜素经结构修饰得到的衍生物以及它们的抗肿瘤细胞的活性。
Objective: To investigate the derivants of bergenin through structural modification and their activity of anti-tumor cells.
结果分离得到8个化合物，结构修饰4个化合物，并测得其pde5抑制活性数据。
RESULTS 8 compounds were isolated and identified, and 4 compounds were obtained by structure modification. The activities data as PDE5 inhibitors were tested.
综述了近十年活性染料在商品化技术、清洁工艺、结构修饰和基础研究领域的进展。
Developments in reactive dyes during the past decade, including commercialization and clean production technologies and fundamental research work, are reviewed.
本研究结果对于进一步了解羟基积雪草苷在人体中的代谢和结构修饰具有重要的意义。
The result of this study has a great significance to further understanding of madecassoside in the metabolism and the structural modification of madecassoside.
为提高内皮抑素的治疗效果，本研究采用聚乙二醇（PEG）对内皮抑素进行结构修饰。
To improve the treatment effect of endostain, we used PEG to modify its structure. Because PEG so far is the best and most popular modifier forproteins.
近年来，国内外学者对其提取分离方法、分析方法、药理作用、结构修饰等方面进行了研究。
In recent years, domestic and foreign scholars have made researches on its extraction and separation methods, analytical methods, pharmacological effects, structural modification, and so on.
摘要：利用生物转化对天然药物进行结构修饰，是筛选新的天然活性化合物的有效途径之一。
Abstract: the use of biological transformation of structural modification of natural drugs is one of the effective ways for screening new natural active compounds.
本文综述了近年来该类药物结构修饰和构效关系的研究进展，为进一步进行新药研究提供线索。
In this paper, their structural modification and structure-activity relationship are reviewed in order to give some clues for the further research.
五环三萜是一类重要的天然产物，研究发现生物转化能够对该类化合物进行多种类型的结构修饰。
Pentacyclic triterpenes are among the most important bioactive compounds and biotransformation is a very useful tool to carry out the structural modification on these compounds.
本文综述了这两类抗菌剂近年来结构修饰及构效关系的研究进展，为进一步的新药研究提供参考。
In the paper, the structural modification and structure-activity relationship of these two types of antibacterials are reviewed in order to give some references for the further research.
我们对四环素类抗生素的化学反应和结构修饰进行了一些初步的探索，制备了一些四环素类衍生物。
Some primary research to the chemical modification of tetracyclines were carried out. Several tetracycline derivatives were prepared.
对分离得到的量较大的化合物进行适当的结构修饰，考察其活性变化，为构效关系的研究奠定了基础。
We did proper configurable embellish to mass compounds and lay a foundation for the relation of structure-activity.
为了寻找新的抗糖尿病化合物，我们改进了知母中芒果苷的提取分离工艺，并对芒果苷进行了结构修饰研究。
In order to look for new antidiabetic compounds, we have improved the method of isolating mangiferin and studied on structure modification of mangiferin.
以天然有机化合物为先导，利用半合成法对其进行结构修饰和改性，是发现新的疗效成分和新药开发一个重要途径。
It is an important approach to find new medical components and to develop new drugs by modifying the structure of natural product.
同时，不同的官能团结构修饰及合成方法的应用将有可能使得其体现出光电性质以外各种新的材料特性，如多孔性吸附材料等。
Their advantages have been applied in the corresponding field and further modification and different synthetic approaches lead to other novel materials, such as microporous materials.
在自然界中存在着具有与白鲜碱结构相类似的生物碱，人们对这类生物碱进行结构修饰和改造，得到了一些具有良好生物活性的衍生物。
There were some alkaloids whose structures were similar to dictamnine in nature, and several dictamnine derivatives with good biological activity were synthesized by structure modification.
本文概括了虾青素的各种异构体及其对生物学功能发挥的差异，并论述了近年来在提高其水相分散度，增加其稳定性等方面的结构修饰的研究进展。
The research progress on astaxanthin' s molecular structure modification to increase its water dispersibility and stability for enhancing physiological function in recent years had b…
酶的催化中心是由一组氨基酸组成，其三维结构形成活性位点，允许它高效地结合或修饰底物。
The catalytic center of an enzyme is composed of a set of amino acids whose three-dimensional arrangement forms the "active-site" that allows them to efficiently bind and modify the substrate.
从理性的角度来看，我们显然可以知道，结构的部分会更加重要，可是也不可以忽略外部的修饰。
Main view: As any rational person may see at their first thought, a decent house can not just have a decent decoration, but also a firm inner structure, which would be even more important .
为此，Renslo博士与其同事已经在分析并尝试修饰氨噻唑的分子结构，以使之能通过血脑屏障。
Dr Renslo and his colleagues have therefore been analysing and modifying the chemical structure of aminothiazoles to see if this can enable them to cross the blood-brain barrier.
该句子的主干是voicesnowcomefrommanyquarters；句首Justas结构做比较状语，意为"正如...一样"；insisting 引导的分词结构做定语修饰主语voice，分词结构中含有两个并列的由that引导的宾语从句，第二个宾语从句的真实主语是不定式结构to keep... 翻译：就象吸烟问题一样，来自不同领域的声音坚持认为有关全球变暖的科学资料还不完整。
Just as on smoking, voices now come from many quarters insisting that the science about global warming is incomplete, that it's Ok to keep pouring fumes into the air until we know for sure。
剩余的大部分更改均是修饰性的，是为了支持两栏的布局结构。
Most of the rest of the changes are cosmetic and support a two-column layout.
剩余的大部分更改均是修饰性的，是为了支持两栏的布局结构。
Most of the rest of the changes are cosmetic and support a two-column layout.
应用推荐