查询词典 DI

Its structure was characterized by FT-IR, 1H NMR and MS. Solubility data of betulin and 3, 28-di-O-glutaryl-betulin in acetone, ethanol, water and phosphate-buffered saline (PBS, pH value 7.4) were determined by equilibrium method.

采用FT-IR、1H NMR和MS对产物进行结构表征，并且选用平衡法测定了桦木醇和桦木醇戊二酸酯在丙酮、无水乙醇、水和磷酸盐缓冲溶液（PBS， pH值7.4，）等不同溶剂中的溶解度。

To improve water solubility of betulin, two acyl groups were introduced at C-3 and C-28 hydroxy groups of betulin. 3, 28-di-O-glutaryl-betulin was synthesized with pyridine as solvent and DMAP as catalyst from betulin and glutaryl anhydride.

为了增强桦木醇的亲水性，对桦木醇的C-3位、C-28位羟基进行修饰，在吡啶作溶剂、二甲基氨基吡啶作催化剂的条件下，与戊二酸酐反应合成桦木醇戊二酸酯。

The chiral polymer P-1 shows strong blue fluorescence due to the extended π-electronic structure between the chiral repeating unit-6,6'-di(4-trifluoromethyl-phenyl)-2,2'-bisoctoxy-1,1'-binaphthyl and the conjugated linker 2,2'-bipyridyl group via vinylene bridge.

手性高分子P-1能发射强的蓝色荧光，这是由于手性重复单元-6，6′-二(4-三氟甲基苯基)-2，2′-二正辛氧基-1，1′-联萘和单元2，2′-联吡啶通过亚乙烯基桥连形成共轭高分子结构造成的。

The reactivities of the phenyl boronic acids containing di-, tri-fluoro substituents with pyridyl bromide were investigated in different catalyst system.

利用钯催化的SUZUKI偶联反应，以氟取代的苯硼酸与2-溴吡啶为原料合成了系列新的邻吡啶芳香化合物，研究了二及三氟取代的苯硼酸与溴代吡啶在不同催化体系中的反应性质。

So try hol di ng your breth for ten seconds, and then rel ease i t sl owl y.

所以试着屏住呼吸 1 0 秒钟，然后慢慢放松。

Basedon the studies on the curing kinetics of TEDS/ DDM system as well as model rcasnon of TEDS/di - n- butylamine, the first order kinetic was proposed for TEDS.

对其与二正丁胺的模型反应、与DDM（4，4'－二氨基二苯基甲烷）的固化反应劝力学研究表明，反应对TEDS为一级反应。

This experiment with dilute alkali swelling on collagen extraction and separation, then purified by gel from collagen, and then glutaraldehyde, carbodiimide, has three types of di-isocyanate cross-linking agent on the plastic recombinant protein molecules cross-linked, the final test of infrared spectroscopy analysis of the results of their cross-linking to determine the extent of the effectiveness of cross-linking cross-linking agent to have an initial understanding.

本实验用稀碱溶胀法对胶原蛋白进行提取与分离，接下来用凝胶层析纯化所得胶原蛋白，然后用戊二醛、碳化二亚胺、己二异氰酸酯三种交联剂对胶原蛋白分子进行重组交联，最后通过对红外光谱测试结果的分析，对其交联程度进行判断，对交联剂的交联功效有一个初步的了解。，谢谢。

Among his most recent projects are the new headquarters of the Port Authority at Marina di Carrara (2007), the Vertex tower and Office Building in Amman (2007), the new Museum of Contemporary art at Fabrika Schindlera in Krakow (2007), dealing with the theme of transformation, the relationship between innovation and history, between form and function, between "product" and communication.

在他最近的项目是新的总部港务局滨海迪卡拉拉（ 2007年），顶点大楼和办公大楼在安曼（ 2007年），新当代艺术博物馆在Fabrika Schindlera在克拉科夫（ 2007年），涉及的主题，改造，创新之间的关系和历史，形式与功能之间的&产品&和沟通。

It occurs chiefly as the di oxide (stannic oxide , SnO2) in cassiterite.

主要以氧化物状态存在。

ANTONIA IDA FONTANA Biblioteca Nazionale Centrale di Firenze, Italy

安东尼娅艾达芬坦阿（佛罗伦萨国立中央图书馆，意大利

This brought fixed cost, but it also is meant at the same time use a source to won't make you singlehanded assume a problem.

这带来了一定的成本，但它同时也意味着使用开源不会让你独力承担问题。

He gained a small fortune in real estate.

他在房地产上发了一笔小财。