查询词典 optical activity

When the heterogeneous catalyst is used in the asymmetric catalytic hydrogenation reaction of ethyl pyruvate under the room temperature and the medium hydrogen pressure, high activity and optical selectivity more than 70 percent are obtained in acetic acid solution, and the heterogeneous catalyst can be repeatedly used for more than 15 times.

本发明提供的催化剂在室温、中等氢压力下用于丙酮酸乙酯的不对称催化氢化反应时在乙酸溶剂中可得到高活性和超过70％的光学选择性，且可以重复使用15次以上。

And some traditional metal materials, non-metallic materials such as steel, cement, plastics, fibers and rubber has been widely used, and a new type of polymer materials is also a beginner's stage, but the very rapid development with very potential, and its positive features, intelligence, refinement of direction, conductive materials, energy storage materials, smart materials, nano materials, optical materials, biological activity, such as research in the field of materials are becoming increasingly active, the study of Polymer Materials very challenging, but also very innovative test of their own.

并且目前一些传统的金属材料，非金属材料如钢铁、水泥、塑料，纤维，橡胶等已经得到了广泛的应用，而新型的高分子材料还在一个起步的阶段，但是发展的很迅猛，具有很大的潜力，其正向功能化，智能化，精细化方向发展，导电材料，贮能材料，智能材料，纳米材料，光导材料，生物活性材料等领域的研究也日趋活跃，所以研究高分子材料很具有挑战性，同时也很考验自己的创新性。

Objective To investigate the effects of interleukin-1 β converting enzyme gene on the biologic characteristics of ovarian cancer cells.

目的 探讨白细胞介素-1 β转换酶的表达，对卵巢癌细胞生物学特性的影响。

Campylobacter: This illness is the most commonly identified cause of diarrheal illness in the world.

弯曲：这种病是最常见的原因查明腹泻病，在世界上。