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A random copolymer of poly(vinyl acetate-co-isopropenyl acetate) with number-average molecular weight of 9600 and relatively narrow molecular weight distribution （MWD, M w/ M n=2.03）was prepared by free radical copolymerization of vinyl acetate with isopropenyl acetate using AIBN as initiator.

通过自由基共聚合方法，以AIBN为引发剂引发醋酸乙烯酯和醋酸异丙烯酯共聚，得到两者的无规共聚物聚。

The photopolymerization led to stable latices and they were obtained with neither coagulation during synthesis nor destabilization over time. It was found that the obtained MMA homopolymers exhibited relatively narrow molecular weight distributions(PDI=1.27—1.36), which was characterized by GPC. The plots of number-average molecular weight vs. conversion and ln([M0]/) vs. time were linear respectively, indicating that the reaction was a controlled/living free radical polymerization.

结果表明，该细乳液体系非常稳定，在整个聚合过程中即没有絮凝物产生，也没有沉淀析出，获得了良好的ln([M0]/)与时间、数均分子量与转化率之间的线性动力学关系，并且在整个聚合反应过程中MMA均聚物的分子量分布比较窄，其多分散性指数较低(PDI=1.27~1.36)，具有明显的活性聚合特征。

The molecular weight of different sources of α-Gal is between 28 000～370 000, and the molecular weight of α-Gal from coffee bean is 41 000.The whole lenth cDNA of α-Gal from coffee bean C.

本研究分离克隆了大粒种咖啡与中粒种咖啡的α-Gal成熟肽编码区的cDNA，而后利用二种微生物表达系统进行重组发酵表达的研究，研究结果如下： 1。

In this paper, we made a brief introduction to the significance of Bayesian inference in the molecular evolution and phylogenetic reconstruction, and its application in the molecular phylogeny of Liliales.

本文简要介绍了贝叶斯推论原理及其在分子进化和系统发育研究中的重要性，并使用该方法对百合目主要类群的系统发育关系进行了重建。

In this paper, we made a brief introduction to the significance of Bayesian inference in the molecular evolution and phylogenetie reconstruction, and its application in the molecular phylogeny of Liliales.

本文简要介绍了贝叶斯推论原理及其在分子进化和系统发育研究中的重要性，并使用该方法对百合目主要类群的系统发育关系进行了重建。

Aimed at the study of Lauraceae system classification in domestic and overseas,genetic diversity and genetic variation between Cinnamomun micranthum Hayata natural populations and Ex-situ conservation poputations and relationship among Its Close Relative Species of Cinnamomum camphora Presl,Cinnamomum burmannii(C.G.etTh.Nee) Bl,Phoebe bournei Yang. Litsea subcoriacea Yang et P.H.Huan. Neolitsea aurata Koidz,Lindera communis Hemsl and Persea Americana Mill.were studied by inter-simple sequence repeats molecular marker.The research aimed at genetic variation between Cinnamomun micranthum Hayata populations,so that can offer the molecular theoretic and practical method for conservation and utilization of Cinnamomun micranthum Hayata populations.

针对目前国内外对樟科植物系统分类的研究现状，本研究采用ISSR分子标记技术对樟科沉水樟天然居群和迁地保护居群的遗传多样性进行研究，从分子水平上分析沉水樟种群的生态遗传及其遗传变异规律；同时利用ISSR分子标记技术比较沉水樟及其近缘种香樟、阴香、闽楠、桂北木姜子、新木姜子、香叶树、鳄梨在分子水平上的亲缘关系，揭示这些树种在樟科植物系统进化中的作用与地位，探讨沉水樟及其近缘种的遗传多样性及其分化格局，为樟科植物的系统分类提供分子水平的依据。

GPC is used to mensurate the number average molecular weight of the product, and analyze the relation between molecular weight and solubility.

用凝胶渗透色谱法测定了产物的分子量，并对分子量与溶解度的关系进行分析。

For the non-patterned clams, a 27kD molecular weighted one was found with isoelectric point of 4.8, matching well sarcoplasmic calcium-binding protein (molecular weight 20.8kD, isoelectric point of 4.98) in genus Meretrix lusoria .

在有花纹文蛤中发现了分子量为27kD 左右，等电点为4.8，与丽文蛤属的肌浆钙结合蛋白(分子量为20.8kD，等电点为4.98)匹配率较高。

Molecular systematics of partial species belonging to 5 subfamilies of Miridae are investigated in this study by using esterase isozyme and cytochrome b gene in mitochondrial DNA as molecular marks.

运用酯酶同工酶和线粒体DNA中编码细胞色素B蛋白质的基因Cyt b作为分子标记，对盲蝽科Miridae的5个亚科的部分种类进行了分子系统学研究。

To summarize molecular, morphology, chromosome and pollen characters, the conclusion was reached that Epimedium was an nd monophyletic taxon. To divide the genus into any groups would be artificial. It is proposed that the disjunction by space, climate and seas were the main reason of respectively differentiation of each group by the view of geographic and climate changes in the temperate zone of the world. Because of its evolution-conservation, the disjunction did not bring about obvious divergence on the level of molecular and morphology.

综合分子特征和形态、细胞学、孢粉学等性状，提出淫羊藿属是一个进化上极为保守的、自然的单系的植物类群，进行属下任何阶元的划分都将是人为的，从旧世界温带的地质变化及气候变迁的角度推测，空间、气候和海洋的隔离是产生类群各自分化的主要原因，但由于其进化上极度保守，这些隔离尚未产生出类群间形态上和分子水平上的明显趋异。

In the days of sailing vessels the crew were afraid they would be becalmed on the ocean.

在使用帆船的时代，船员们担心他们会因为无风而无法在海洋上航行。

As long as foreign donors pay the PA's salary bill, few expect a new intifada.

只要外国继续为巴权力机构的薪水买单，希望发动新暴动的人便寥寥无几。