二分子

The results show that there is excellent linear relationship between solute-related parameters and retention indexes for the saturated hydrocarbon, olefine and diene compounds on different polar chromatographic stationary phases.

结果表明：烷烃、烯烃、二烯烃类化合物在不同极性的色谱柱上的色谱保留与其分子结构描述参数之间具有较好的线性关系，烃类化合物在不同极性固定相上的保留主要与溶质分子的MR有关，即与溶质分子的色散力有关。

Sucrose, table sugar, is a disaccharide composed of one molecule of glucose and one molecule of fructose.

蔗糖，白砂糖是由一个葡萄糖分子和一个果糖分子组成的二糖。

It may result from the coupling of acarbonyl group in one molecule with the double bond in another molecule.

它是由一分子环丁烯二酮的羰基碳与另一分子的双键β-碳发生还原偶联的结果。

Since most of the large molecules containing phosphorus element have double bonds, it is necessary to consider the special structures of double bonds in order to deal with these large systems more accurately. So, based on density functional theory and electronegativity equalization principle, applying a general atom-bond electronegativity equalization method , using separated program, through regression and least-squares optimization , the parameters of atoms and bonds in molecules are determined . By these parameters , the charge distributions and the energy of some molecules containing phosphorus element, especial the fragment of DNA, RNA, are calculated . The results are quite good.

由于这些含磷生物大分子体系都含有双键，为了明确的处理双键，进而更准确的解释带有双键和共轭双键的含磷生物大分子结构与性质的关系，我们以密度泛函理论~([1-4])和电负性均衡原理~([5-9])为基础，应用和开发原子-键电负性均衡方法中的σπ模型，利用最小二乘法，拟合确定了一些分子（含碳、氮、氧、氢以及磷等原子）的各种类型原子及化学键区域的参数，并利用上述参数计算了一些多聚核苷酸的电荷分布以及分子的总能量，进行了讨论，得到的结果可以和从头算相媲美。

In Chapter four,we investigate the effect of different side groups,anchoring groups(dithiocarboxylate and thiol group),torsion angle and external electric field on the electronic transport properties of 4,4′-biphenyldithiolmolecular junction.

第四章中我们主要系统地研究了官能团、不同的连接方式、分子间的扭转角以及外电场对4，4\'-二巯基联苯分子的电输运性质的影响。

The DNA fingerprints of 4 biotypes of GM population from 7 locations were analyses by AFLP.Base on the fine mapping of resistance gene Gm6 against all 4 Chinese GM biotypes by RAPD and SSR methods respectively,the STS markers and SSR markers linked to gene Gm6 were used for breeding through marker assisted selection.Some new resistant germplasm with Gm6 gene were created.And 6 cultivars and 6 lines of two-line hybrid rice and 1 line of three-line hybrid rice against GM were bred and extended to the farmer.The technique system of MAS for resistant varieties against Asian rice gall midge was set up at Guangdong province of China.

用AFLP方法对从中国广东省7个地点采集的4个生物型的DAN指纹进行分析；在对用RAPD和SSR技术分别对抗中国4个稻瘿蚊生物型的基因Gm6精细定位基础上，用与Gm6紧密连锁的STS和SSR标记开展分子标记辅助育种，创造了一批抗稻瘿蚊的新种质，包括育成了6个栽培稻和6个二系杂交稻和1个三系杂交稻并在农户试种，在中国广东成功地建立了分子标记辅助选育抗稻瘿蚊品种的技术体系。

These two penultimate residues TyrHC2 (140)α and TyrHC2 (145)βseem to play a more important role in propagating structural changes between different part of the molecule, such as the molecular surface,α〓β〓 interface and the haem proximal side in bar-headed goose Hb.

这二个Tyr残基在传递Hb分子不同部位的构象变化方面起了重要作用。如从Hb分子的表面至α〓β〓亚基交界面又至血红素临近侧。

It shows that the cone conformation of the hosts is more stable than others when it is nottaking account of the solvent. Then, the possibility of the conformational interconversion of hosts at the different temperature iscalculated by molecular dynamics.

二是应用分子动力学方法探讨了在不同温度下各种构象之间相互转换的可能性，表明了当分子的下缘取代基团比较大时，增大了苯酚环发生翻转的空间位阻，各种构象之间翻转的难度将有所增加。

Isoprene is a monomer, which is a substance whose molecules can be linked together chemically to form a polymer.

异戊二烯是一种单分子物体，该物质的分子可以通过化学反应联在一起，从而形成高分子聚合体。

The α-helical structure of the globulin is an important factor to forming and stabilizing the protein emulsion. The particle size distribution of legumin and vicilin hydrolysates were measured by dynamic light scattering, the particle size of legumin hydrolysates was decreased at first then increased during the papain hydrolysis, but the vicilin hydrolysates decreased continuously, it demonstrated that the legumin hydrolysates might have a re-aggregation in the solution which the vicilin hydrolysates did not have.

采用动态激光光散射分析了水解产物的粒径分布，结果表明：随着水解的进行，11S球蛋白水解物在溶液中的粒径出现先减小后增加的趋势，而7S球蛋白水解物的粒径呈递减趋势，说明11S水解产物分子间发生了新的选择性定向和聚合，而7S水解物分子间未发生二次聚合。

But we don't care about Battlegrounds.

但我们并不在乎沙场中的显露。

Ah! don't mention it, the butcher's shop is a horror.

啊！不用提了。提到肉，真是糟透了。