官能团

What functional groups must be present to confer this pI on pepsin?

必须存在什么样的官能团才能造成胃蛋白酶这样的pI？

The plasticization of the material is affected by the non-freezing water in hydrogel rather than by the freezing water.

研究结果发现不同状态的水在凝胶中的含量既与吸水官能团的性质和数量有关，又与聚合物链的交联度有关，交联度增大，水凝胶的平衡含水量降低。

The preparation process of self-holing polyimide with organosilicon block includes the following steps: 1 the first reaction of polyacid anhydride in functionality not lower than 2, silicon oil with 2 or more amino or imino groups and polyamine with 2 or more amino groups, and the second reaction with one or several kinds of added isocyanate with 2 or more isocyanate radicals to produce sol of polyamido acid containing organosilicon block; 2 solidifying the sol to obtain solid polyamido acid containing organosilicon block; and 3 imidonating the solid to obtain self-holing polyimide with organosilicon block.

本发明公开了一种有机硅嵌段自发孔聚酰亚胺的制备方法，该方法包括以下步骤：(1)有机溶剂中具有大于或者等于2的酸酐官能团度的多酸酐与具有大于或者等于2的胺基或亚胺基的硅油以及具有大于或者等于2的胺基的多胺反应，随后添加一种或多种具有含有等于或者大于2个异氰酸酯基的异氰酸酯反应，生成含有机硅嵌段聚酰胺酸的溶胶。(2)溶胶固化制成有机硅嵌段聚酰胺酸固体。(3)固体亚胺化，即得有机硅嵌段自发孔聚酰亚胺。

Ionic attraction between the –SO3- residues on the column and the charged functional groups on the amino acid residues and hydrophobic interactions between amino acid side chains and the strongly hydrophobic bead of polystyrene resin.

柱子上的–SO3-与氨基酸残基上的带电官能团之间的离子吸引和氨基酸侧链与高度疏水的聚苯乙烯树脂珠之间的疏水相互作用。

According to the invention, a base polymer which is produced on the basis of a monomer including up to at least 50 % neutralised acid groups is mixed with a first aqueous solution containing at least one surface secondary crosslinker and with a second aqueous solution containing at least one polyvalent cation, and is thermally treated.

根据本发明，使基质聚合物与含有至少一种表面二次交联剂的第一水溶液和含有至少一种多价阳离子的第二水溶液混合，并热处理，其中所述基质聚合物基于含有至少50％中和的酸官能团的单体而制备。

The polyfunctional monomer s were found to prohibite the thermal degradation of sPP.

结果表明，多官能团单体可以明显抑制间规聚丙烯在交联过程中的β降解，促进 s PP交联。

The polyfunctional monomers were found to prohibite the thermal degradation of sPP.

结果表 明，多官能团单体可以明显抑制间规聚丙烯在交联过程中的β降解，促进sPP交联。

It is quite different in the powder properties between Indonesian coal A and Indonesian coal B based on the analysis of Fourier transform infrared spectroscopy and scanning electronic microscope so as to solve the problem of powder agglomeration during the operation of medium-speed coal pulverizer.

为了解决中速磨煤机磨制印尼煤时的煤粉团聚问题，利用傅立叶红外光谱和扫描电镜对印尼A煤和B煤进行了分析，发现这两种煤的粉体特性相差很大，印尼A煤含有容易团聚的官能团。

Synthesis of pyruvic acid from lactic acid by catalytic oxidation with oxygen was studied. The effect of catalyst composition, amount of catalyst and oxygen, reaction temperature and time on product yield was investigated and the optimum conditions were found.

由于丙酮酸的分子中同时具有羰基和羧基两个官能团，因而反应中心多而显出比一般化合物更为重要和特殊的化学性质，已引起越来越多的化学工作者的重视。

Two representative compounds have been determined by X-ray crystallography. The best ratio of reactants, the adequate reaction temperature and solvent have been found by contrast experiments.4. The better photoreaction conditions and irridation times have been confirmed through the different photoreaction results. It is the first time that fifty quinazoline derivatives with biological activity and four photooxidation products with urea functional groups have been obtained by photochemistry method. Two representative compounds, quinazoline derivatives and photooxidation products, have been determined by X-ray crystallography, respectively.

通过实验对比我们找到了较佳的反应物的投料比、反应温度和反应所用的溶剂。4、根据不同条件下的光反应结果，确定了硫脲衍生物的相对较好的光反应条件和光照时间，首次利用光化学手段成功得到50个具有生物活性的喹唑啉衍生物和4个具有脲基官能团的光氧化的产物，测定了两个具有代表性的喹唑啉和光氧化的产物的晶体结构。

However, as the name（read－only memory）implies, CD disks cannot be written onorchanged in any way.

然而，正如其名字所指出的那样，CD盘不能写，也不能用任何方式改变其内容。

Galvanizes steel pallet is mainly export which suits standard packing of European Union, the North America. galvanizes steel pallet is suitable to heavy rack. Pallet surface can design plate type, corrugated and the gap form, satisfies the different requirements.

镀锌钢托盘多用于出口，替代木托盘，免薰蒸，符合欧盟、北美各国对出口货物包装材料的法令要求；喷涂钢托盘适用于重载上货架之用，托盘表面根据需要制作成平板状、波纹状及间隔形式，满足不同的使用要求。