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Based on the available crystal structures of MMPs, the structure-activity relationship of barbiturate compounds was discussed; and the reason for imidazole-based compounds'low activity was presented.

本文结合已有的晶体结构，对巴比妥酸类作了初步的构效关系探讨，并对咪唑类化合物活性低的原因进行了初步分析，对进一步的结构改造和合理设计具有一定的指导意义。

The structural features and crystalform of the barium carbonate crystal were characterized by SEM and XRD.

用SEM和XRD其形貌和晶型进行了表征，结果表明：体系中的丙二酸控制了碳酸钡晶体的生长方向，在纤维状碳酸钡晶体形成过程中起着软模板的作用。

Barium carbonate crystal with fiber structure was prepared from malonic acid.

以丙二酸做为调控剂，得到纤维状的碳酸钡晶体。

The experimental results showed that the raw materials can be totally conversed when reacted for 45 min;and the average size of prepared barium carbonate was 1 μm.It also discovered that crystal water was not feasible for accelerating the reaction speed and increasing the degree of crystallization.

试验结果表明：反应45 min原料即可完全转化，制备的碳酸钡颗粒平均尺寸约1 μm，并且发现利用结晶水加快反应速度、提高产物结晶程度是不可行的。

From 93 to begin production barium hydroxide products so far, the company re-technology, and management is the production of "Pui-yu," licensing eight water barium hydroxide, a water barium hydroxide powder, a crystal water barium hydroxide, barium borate partial , barium carbonate, thiourea, and other products exported to the United States, Japan, Europe, South Africa, Southeast Asia, Taiwan, and other countries and regions.

从93年开始生产氢氧化钡产品至今，公司重科技、抓管理，现生产的"榆贝"牌八水氢氧化钡、粉体一水氢氧化钡、晶体一水氢氧化钡、偏硼酸钡、碳酸钡、硫脲等产品，远销美国、日本、欧洲、南非、东南亚、台湾等国家和地区。

I have eight main products plant water barium hydroxide, a water barium hydroxide powder, a crystal water barium hydroxide, barium borate partial, thiourea, barium carbonate, barium chloride, barium nitrate, after I plant refined products up to no chlorine, no sodium, low Sr, low iron.

我厂主要产品有八水氢氧化钡、粉体一水氢氧化钡、晶体一水氢氧化钡、偏硼酸钡、硫脲、碳酸钡、氯化钡、硝酸钡等，经过我厂精制的产品可达无氯、无钠、低锶、极低铁。

This is a Baroque Swarovski Crystal Pendant.

这是一个巴洛克式的水晶吊灯。

The crystal structure of binding protein of acetylcholine can help us to understand the role of basic aminoacid in D ring of binding location of ACh in the selectivity of neonicotinoid insecticides.

乙酰胆碱结合蛋白的晶体结构帮助人们进一步认识了D环上碱性氨基酸残基在新烟碱类选择机制上的作用。

Wyoming's Lonesome Lake captures a crystal clear likeness of Cirque of the Towers, a circular mountain-ringed basin in the Wind River Range.

怀俄明州的寂寞湖捕捉一个晶莹剔透的相似物的梦幻塔，一个圆形的山脉-环盆地在风河山脉。

Patterns in Nature: Reflections Wyoming's Lonesome Lake captures a crystal clear likeness of Cirque of the Towers, a circular mountain-ringed basin in the Wind River Range.

怀俄明州的寂寞的湖捕捉到水晶状清晰的相似性大圆环的塔楼，圆山――环盆地，在风河范围内。

Shop assistant: Please check at the door.

店员：请您到门口柜台交费。

In the end, transportation of PAHs in the environmental matrix was preliminarily investigated and discussed according to PAHs data of soils and sediments from a certain region in Shanghai. The result indicated that there are two or more pathways on PAHs transportation in the environmental matrix.

最后，对上海特定地区内PAHs在环境介质中的迁移径途进行了分析讨论，结果表明上海市土壤和沉积物等环境介质中PAHs的迁移存在多种途径。