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Low molecular weight mannuronic acid, guluronic acid and κ-carrageenan were prepared from algin and carrageenan by the acid hydrolysis method, and their weight average molecular weights and the distribution widths of molecular weight were determined by high performance gel permeation chromatography respectively.

本文以褐藻胶和κ-卡拉胶为原料通过酸水解分别获得了低聚的甘露糖醛酸，古罗糖醛酸和低聚κ-卡拉胶，并采用HPGPC法测定了这3种低聚糖的重均分子量。

Low molecular weight mannuronic acid, guluronic acid and κ carrageenan were prepared from algin and carrageenan by the acid hydrolysis method, and their weight average molecular weights and the distribution widths of molecular weight were determined by high performance gel permeation chromatography respectively.

本文以褐藻胶和κ-卡拉胶为原料通过酸水解分别获得了低聚的甘露糖醛酸、古罗糖醛酸和低聚κ-卡拉胶，并采用 HPGPC法测定了这 3种低聚糖的重均分子量。在此基础上再经硫酸酯化和成盐修饰制备了各自的硫酸酯碱式铝盐。

The results demonstrated that the measured molecular weight of phycocyanin was 37.715Kd, and consisted of two peptides which were similar with their molecular weight and amino acid sequences.4 The comformation of phycocyaninPhycocyanin high structure was investigated, as the result of circular dichroism spectrum and Fourier transformation infared spectrum shown, the secondary structure of NSPC was mainlyα-helix structure and the content ofβ-shee or coil was very small.

根据氨基酸自动分析仪测定的氨基酸组成和精确分子质量计算出NSPC分子总共有331个氨基酸残基，分别是由40个Asp、22个Thr、18个Ser、22个Glu、1个Gly、31个Ala、27个Cys、17个Val、13个Ile、22个Leu、5个Tyr、7个Phe、7个Lys、24个His、51个Arg、14个Pro、1个Met和9个Trp组成。胰蛋白水解酶分别酶解NSPC-1和NSPC-2后，分别采用MALDI-TOF-MS分析，其肽指纹谱图显示胰蛋白酶可将NSPC-1和NSPC-2水解成大小不等的多条肽段，质量数在800以上的NSPC-2有11段，即水解的肽质量分别为899.54、1454.77、1544.9、1683.87、1803.93、1811.91、1987.92、2003.90、2536.26、2915.42和3492.72。

A large molecular sizing agent modified AKD was prepared through the reaction between alkyl ketene dimmer and polyamide then cationization by epichlorohydrin. The large molecular sizing agent has high positive charge and emulsifiability.

摘 要：将聚酰胺多胺与AKD反应，并用环氧氯丙烷将其阳离子化，制备出一种具有高阳电荷的改性AKD大分子，并在中、碱性条件下用该改性AKD对漂白硫酸盐阔叶木浆进行施胶。

A series homopolyme of ethylene synthesised by metallocene catalyst was analyzed by the high temperature gelatin permeation chromatography. The results showed that the molecular weight distribution changed not too much when the ratio of Al/Ti ranging between 1000 and 4000, while the molecular weight distributed increased from 2.48 to 2.81 when the ratio ranging between 4000 and 7000; catalyst D had the lowest activity to be used as asymmetric metallocene catalyst; the curve of molecular weight moved much to the left with the increases of temperature and two active centres appeared when the temperature is 70℃.

通过高温凝胶渗透色谱对茂金属催化合成的一系列乙烯均聚物进行了分析，可以看出Al/Ti比从1000变到4000时，分子量分布曲线图变化不大，而从4000变到7000时，变化相当大，分布宽度从2.48增至2.81；催化剂D的活性最小，可作为非对称性茂系金属催化剂；该聚合体系分子量的大小受聚合温度的影响很明显，随温度的升高，分子量分布曲线图向左发生很大位移，在聚合温度为70℃时存在两个活性相当的活性中心。

These studies indicate the rationality of our molecular design based on the crystal structure of KARI complex. To obtain more KARI inhibitors with high activities, the molecular docking and 3D-QSAR methods were applied to our further studying of these amidine compounds. Two methods AutoDock3. 0.3 and DOCK4. 0 were used in molecular docking, and the calculate results accord with that of herbicidal tests in general. The CoMFA model from 3D-QSAR analysis provided useful guidance for designing highly active compounds prior to their synthesis.

这些分子作为潜在的KARI抑制剂为基于KARI的农药分子设计提供了有利指导；对部分小分子进行了合成，在除草活性初筛的近三十个化合物中，个别化合物表现出较好的除草活性，其中一个化合物wb1596对油菜和稗草具有较高的生长抑制率，并通过E.coli KARI酶活性抑制试验验证了其KARI酶的作用靶标，此化合物可以作为KARI一个有苗头的抑制剂为后续工作奠定了基础；对发现的有苗头的KARI抑制剂进行了结构修饰和优化，合成了一系列脒类化合物并确证了它们的结构，改造后的化合物与原抑制剂相比大多除草活性相当或更佳，从而表明我们基于靶标结构的分子设计的合理可靠性；对所合成一系列脒类化合物进行了分子对接和三维定量构效关系研究。

Objective:To produce low-sugar and high-moisture preserved pachyrhizus; Methods:The relationship of moisture and water activity, numbers of bacterial and mildew were researched. Then water activity was reduced by chitosans with different viscosity-average molecular weights; Results:The number of mildew was a major microbial index of quality-maintaining duration of product. The lower viscosity-average molecular weights of chitosans was, the more water activity reduced; Conclusion:When 9 kD molecular weight,...

目的：为生产低糖、高水分含量番薯果脯；方法：研究果脯中水分含量与水分活度的关系及细菌总数和霉菌数在保温试验中的变化，并采用不同黏均分子量的壳聚糖降低果脯的水分活度；结果：果脯中霉菌数是影响产品保质期的主要微生物指标，壳聚糖的黏均分子量越低，降低水分活度的幅度越大；结论：通过添加0.5%、9kD黏均分子量的壳聚糖，产品水分含量为20%、总糖为26%时，番薯果脯常温放置保值期达到12个月。

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For inorganic or organic iodides with different molecular sizes and molecular iodine said adsorbent has high adsorption action, and its strength is high.

对不同分子尺寸的无机与有机碘化物以及分子碘，该载银大孔沸石分子筛吸附剂都有高的吸附作用，且其强度高。

In the present dissertation, a surfactant-templated mesoporous silica molecular sieve with high pore volume, high porosity and narrow bimodal mesopore size distribution was synthesized for the first time in a reaction system, which was used usually in the synthesis of mesoporous MCM-41 molecular sieves, by a judiciously controlled two-phase sol-gel processing under basic conditions.

在本论文中，我们通过对一个通常用于制备介孔MCM-41分子筛的反应体系中正硅酸乙酯水解与缩合反应相对速率的精确调控，首次在弱碱性体系中合成了一种具有高孔隙率、大孔体积和双介孔孔分布特征的新型二氧化硅分子筛材料，简记为BMS，并对BMS二氧化硅分子筛中双介孔结构形成的原因及各种可能对其结构和性质产生影响的合成因素如Ammonia／silica摩尔比、组分浓度的变化、表面活性剂烷基链长度的调节、辅助有机物均三甲苯的引入、催化剂的结构和性质、溶剂和助溶剂的极性和用量、老化和干燥条件的变化及合成后水热处理等，利用不同的测试手段如XRD，SEM，TEM，〓Si MAS NMR，TG-DTA，N〓吸附测试等进行了系统的表征研究。

Breath, muscle contraction of the buttocks; arch body, as far as possible to hold his head, right leg straight towards the ceiling (peg-leg knee in order to avoid muscle tension).

呼气，收缩臀部肌肉；拱起身体，尽量抬起头来，右腿伸直朝向天花板（膝微屈，以避免肌肉紧张）。

The cost of moving grain food products was unchanged from May, but year over year are up 8%.

粮食产品的运输费用与5月份相比没有变化，但却比去年同期高8％。