衍生物

Novel chitosan derivative with long alky groups as the hydrophobic moieties and carboxymethyl groups as the hydrophilic moieties was synthesized. The chemical structure of N-octyl-O, N-carboxymethyl chitosan was characterized via FTIR, 1H NMR and elemental analysis. The physical properties were analyzed with wide angle X-ray diffraction and differential scanning calorimetry.

以天然可生物降解的壳聚糖为原料，通过在壳聚糖6位羟基上引入羧甲基，在2位氨基上引入疏水烷基链，制得N-辛基－O，N-羧甲基壳聚糖两亲性衍生物，分别用FTIR、1H NMR和元素分析等技术对其结构进行表征，用广角X射线衍射和差示扫描量热法对具物理性质进行分析，并考察其在各种溶剂中的溶解性能及其对难溶性药物的增溶能力。

The research of alkyl polyglycoside and its derivatives is becoming the focus of many international studies and researches.

对烷基多苷及其衍生物的研究是国际上表面活性剂研究的热点。

After hydrogenation of the double bond and the addition of alkyne to a carbonyl we introduced the N-hydroxy group by SN2 reaction.

不对称氢化和炔负离子对羰基的立体选择性加成构建了两个新的手性中心，之后用羟胺衍生物对羟基的SN2取代反应引入了羟胺片断。

In this novel cyclization, nucleophiles very regioselectively attack the internal C1′alkyne carbon of enediynes to give benzene derivatives as a single regioisomer.

在这新的环化，亲核攻击非常regioselectively内部C1'alkyne碳的enediynes给予苯衍生物作为一个单一的regioisomer 。

Microbial-nitrogen estimated from total purine derivatives was higher than that from allantoin.

用嘌呤衍生物总量计算的结果高于用尿囊素计算的结果。

Second, the alleviative effects of cysteine derivatives on MCD diet-induced hepatotoxicity was examined.

第二章的研究是探讨半胱胺酸衍生物对甲硫胺酸与胆碱缺乏饮食诱发之肝脏脂质代谢异常的影响。

Allylic amine derivatives are inexpensive to prepare and are very stable.

烯胺衍生物是廉价的准备，而且非常稳定。

An advantage of the new methods is the utilization of easily accessible allylic amine derivatives as monomer precursors.

一，利用这种新方法是利用方便烯胺衍生物作为单体的前体。

In the second chapter, a series of 6-aromatic amine carbonyl pyridine-2-carboxylic acid ligands have been designed, synthesized and characterized.

第二章报道了一系列新型6-位取代的吡啶-2-甲酸衍生物有机配体的分子设计、合成，并用元素分析、红外吸收光谱、核磁共振谱、质谱等方法进行了组成和结构分析。

Nitrile is a kind of organic compounds containing cyano group,it is a starting material to synthesize a series of amine,acid and polymer.Hydrolysis reactions of nitriles have been widely applied in plentiful of organic synthesis such as amino acid, amide,carboxylic acid and its derivatives,which occupy an extremely important position in organic synthesis.

腈是一类含氰基的有机化合物，作为合成一系列胺、酸和聚合物的起始原料，其水解反应广泛应用于氨基酸、酰胺、羧酸及其衍生物的合成，在有机合成中占有极其重要的地位。

On the other hand, the more important thing is because the urban housing is a kind of heterogeneity products.

另一方面，更重要的是由于城市住房是一种异质性产品。

Climate histogram is the fall that collects place measure calm value, cent serves as cross axle for a few equal interval, the area that the frequency that the value appears according to place is accumulated and becomes will be determined inside each interval, discharge the graph that rise with post, also be called histogram.

气候直方图是将所收集的降水量测定值，分为几个相等的区间作为横轴，并将各区间内所测定值依所出现的次数累积而成的面积，用柱子排起来的图形，也叫做柱状图。