再制备

Silica gel column and reversed-phase C-18 column were employed to purify and separate monohydroxy intermediates.

此外，对DKR催化双羰基底物还原得到的3R，5S-双羟基产物进行纯化，再通过羟基保护和保护基的去除，以用于他汀类药物的手性侧链制备。

In this study, 0.94(Bi0.5Na0.5)TiO3-0.06BaTiO3 is a composition within morphotropic phase boundary. It was prepared by solid state reaction method. The dense ceramics with various grain size distributions were prepared by adjusting process. And grain size effect on crystal structure, dielectric, ferroelectric and piezoelectric properties were studied in detail.

故本研究将以固态反应法合成(Bi0.5Na0.5)TiO3-BaTiO3系统中之MPB 组成之0.94(Bi0.5Na0.5)TiO3-0.06 BaTiO3，并利用制程的调整以制备具有不同晶粒大小之致密陶瓷体，再来探讨晶粒大小变化对晶体结构、介电性质、铁电性质以及压电性质之影响。

objectiveto investigate the effect of myricetin dispersible tablets on experimental cerebral ischemia-reperfusion injury in rats and thrombosis formation.methodsexperimental cerebral ischemia-reperfusion injury model was induced by ligation bilateral common carotid arteries. the protective effect of myricetin dispersible tablets was observed by detecting the content of cerebral water, sod and mao activities,mda and la contents.

方法采用双侧颈总动脉结扎法制备大鼠实验性全脑缺血再灌注损伤模型，通过测定大鼠脑含水量，超氧化物歧化酶、单胺氧化酶的活性和丙二醛、乳酸的含量，观察杨梅素分散片对大鼠实验性脑缺血的影响；采用体内静脉血栓形成法，观察杨梅素分散片对体内静脉血栓形成的影响；并研究其对血小板聚集的影响。

MethodsExperimental cerebral ischemia-reperfusion injury model was induced by ligation bilateral common carotid arteries. The protective effect of myricetin dispersible tablets was observed by detecting the content of cerebral water, SOD and MAO activities,MDA and LA contents.

方法采用双侧颈总动脉结扎法制备大鼠实验性全脑缺血再灌注损伤模型，通过测定大鼠脑含水量，超氧化物歧化酶、单胺氧化酶的活性和丙二醛、乳酸的含量，观察杨梅素分散片对大鼠实验性脑缺血的影响；采用体内静脉血栓形成法，观察杨梅素分散片对体内静脉血栓形成的影响；并研究其对血小板聚集的影响。

Scanning electron microscopy,transmission electron microscopy,circular dichroism and small-angle X-ray diffraction were used to analyze the aggregation mode of CSG in the organogel phase.A hierarchical self-assembly model was proposed to explain the transition from molecular to primary and secondary structure.It is shown from our results that CSG can aggregate into a micellar fibril nanostructure with high length-to-width ratio which is bundled and entangled to form a three-dimensional(3D) network that immobilize the fluid component probably by surface tension.Moreover,sol-gel polymerization of tetraethoxysilane was carried out using CSG in the gel phase.

通过扫描电镜(ScanningElectron Microscopy，SEM)、透射电镜(Transmission Electron Microscopy，TEM)、圆二色谱(Circular Dichroism，CD)和小角X—射线衍射仪(Small-angle X-rayDiffraction，SAXRD)考察CSG分子自组装行为结果表明，CSG形成的聚集体具有多级结构：首先CSG通过手性堆叠自组装形成直径在9—10nm的细纳米纤维，这些细的纳米纤维再以不规则的六方堆积的方式进行排列，构成直径在40—100nm的粗纳米纤维(即细纳米纤维的&捆束&)，最后粗纳米纤维互相粘连形成三维网络状结构，使有机溶剂&固定&，从而形成凝胶；以CSG有机凝胶为模板，四乙氧基硅烷为前体，通过溶胶—凝胶聚合的方法制备了直径大约为100nm的二氧化硅纳米管。3。

A process of preparing phosphorus pentafluoride was put forward: first, mesneproduct was prepared from phosphorus pentoxide and anhydrous hydrogen fluoride; second, phosphorus pentafluoride was acquired after dealing with the hexafluorophosphoric acid.

本文以五氧化二磷和无水氟化氢为原料，首先制备中间产物六氟磷酸，再通过对六氟磷酸进行处理以生产五氟化磷。

In accordance with the invention, the hG-CSF protein can be prepared with high purity through rather simple process facilitating secretion of large amount of hG-CSF fusion protein into the periplasm, which does not require complicated processes such as solubilization and subsequent refolding required for isolation of the hG-CSF protein produced in cytoplasm as insoluble inclusion bodies by conventional techniques, thus, the hG-CSF protein can be widely used as an active ingredient in the development of supplementary agents for anticancer therapy.

根据本发明，通过促进大量hG－CSF融合蛋白分泌到周质中的相当简单的方法可以高纯度制备hG－CSF蛋白，所述方法不需要复杂的加工过程例如对于通过常规技术分离胞质中产生的作为不溶性包函体的hG－CSF所需的溶解和随后再折叠，因此，在开发用于抗癌治疗的补充药物的过程中可用hG－CSF蛋白广泛地作为活性成分。

The analysis showed that the ZnO films prepared by two-step oxidation show higher photoactive characteristic than that prepared by direct oxidation method.

即先在纯氧气氛中低于金属锌熔点的温度下对制备的Zn膜进行初步氧化，然后再提高氧化温度进行二次氧化。

Gabriel reaction was adopted to synthesis 2-(0ctahydro-1-azocinyl)ethylamine, N-(β-Heptamethyleniminoethy1)phthalimide was prepared by treating Heptamethylenimine with N -(β-bromoethy1) phthalimide. N -(β-bromoethy1) phthalimide was easily prepared from phthalic anhydride in two steps.

我们采用Gabriel伯胺合成法制备2-环庚亚胺基乙胺，从邻苯二甲酸酐经过两步反应很容易地得到N-邻苯二甲酰亚胺，然后与环庚亚胺发生亲核取代反应，产物再水解制得伯胺2-环庚亚胺基乙胺。

Using of agarose-embedment lysis cell wallmethod for preparing intact chromosomal DNA from phytopathogenic fungi is thefirst time.

首次采用凝胶包理破壁法由植物病原真菌分生孢子获得完整染色体DNA，克服了先用裂解酶破壁获得大量原生质体再用琼脂糖包理原生质体的传统制备方法的一些不足。

It has been put forward that there exists single Ball point and double Ball points on the symmetrical connecting-rod curves of equilateral mechanisms.

从鲍尔点的形成原理出发，分析对称连杆曲线上鲍尔点的产生条件，提出等边机构的对称连杆曲线上有单鲍尔点和双鲍尔点。

The factory affiliated to the Group primarily manufactures multiple-purpose pincers, baking kits, knives, scissors, kitchenware, gardening tools and beauty care kits as well as other hardware tools, the annual production value of which reaches US$ 30 million dollars.

集团所属工厂主要生产多用钳、烤具、刀具、剪刀、厨具、花园工具、美容套等五金产品，年生产总值3000万美元，产品价廉物美、选料上乘、质量保证，深受国内外客户的青睐