再制备

A series of novel polyethylene glycol derivates was synthesized by esterification of chloroacetic acid with polyethylene glycol. Because of the good reactive activity of α-chlorin in the esters it can react with 5-fluorouracil, thus the conjugate can be obtained .

采用氯乙酸与不同分子量的聚乙二醇进行酯化反应得到氯乙酸聚乙二醇酯，由于酯中的α-氯具有良好的反应活性，将它再与抗癌药物5-氟尿嘧啶结合制备了不同分子量的高分子前药。

In this article, the factors that affect molecular weight and solubility of polyacrylamide are studied and suitable initiator system is selected. The optimum parameters of copolymerizing process are obtained as follows: the molar proportion of acrylamide and sodium acrylate is 7:3, the monomer concentration is 30%, pH value of solution is 12, the oxidizer (K2S2O8) concentration is 0.1%, the reducing agent (NH2CONH2) concentration is 1%, the chain-transfer agent concentration is 0.4%. The initial reaction temperature is 35℃.

讨论了影响聚丙烯酰胺分子量和溶解性能的因素，选取了合适的氧化-还原引发体系，确定了制备超高分子量速溶型部分水解聚丙烯酰胺的优化聚合工艺参数：起始共聚合反应温度为35℃，保持在密闭条件下的共聚合反应2.5h后，再将聚合反应温度升高到55℃，继续反应2h，反应结束；反应溶液单体总浓度：30％，共聚合反应溶液pH值：12，氧化剂K_2S_2O_8：0.1％，还原剂NH_2CONH_2：1％，共聚合反应中两种单体的投料比：丙烯酰胺：丙烯酸钠=7：3，异丙醇链转移剂：0.4％。

The invention comprises the following steps: one end of the optical fiber array is irradiated by an ultraviolet light for 5 seconds to 10 minutes and is put under 550 DEG C to 600 DEG C for 30 minutes to 5 hours; then is corraded by the acid.

本发明提供了一种生物芯片用光纤阵列的制备方法，包括以下步骤：将光纤阵列一端用紫外光照射5s～10min；然后在550℃～600℃下放置30min～5h；再用酸进行侵蚀。

Result: The anticancer active component includes: taxol 9.45%、cephalomanine: 9.63%、10- deacetylbaccatinⅢ: 22.64%、total flavonoids: 19.15%. 3. The preparation of Seiadopitysin control Methods: Take dry Ginkgo leaves and extracted three times by sonication with 95% EtOH, solutions were concentrated under vacuum, after defatting by petroleum benzin, the sample was extracted with EtOAc and the solutions were concentrated under vacuum.

金松双黄酮对照品的制备方法：取干燥银杏叶以95％乙醇超声提取3次，提取液合并，减压浓缩，石油醚脱脂后，用乙酸乙酯萃取，萃取液减压浓缩，经硅胶柱(6cm×80cm)层析，石油醚-乙酸乙酯(9∶1～5∶5)梯度洗脱，产物用甲醇多次冲淋，再以二甲基甲酰氨溶解，反复重结晶，得黄色粉末结晶。

The influences of foaming and holding time on bubble diameter and the property of devitrified foam glass have been studied.

以废玻璃为主要原料，用V2O5作为成核剂，再加入其它辅助原料制备了微晶泡沫玻璃，研究了发泡温度、保温时间对微晶泡沫玻璃泡径及性能的影响。

The influence of foaming temperature and holding time on bubble diameter and the property of devitrified foam glass have been studied.

以碎玻璃为主要原料，用V2O5作成核剂，再加入其它辅助原料制备了微晶泡沫玻璃。

The regasification kinetics of these partially gasified chars for different atmosphere was analyzed by a thermobalance.

在小型固定床上制备了一系列的神木煤部分气化煤焦，运用热天平分析了它们在不同气氛下的再气化动力学行为。

Methods A rabbit model of myocardial ischemia and reperfusion was established by ligating the anterior descending coronary artery.

采用结扎新西兰兔左冠状动脉前降支的方法制备缺血再灌注动物模型，用电磁血流量计测量心输出量，应用美国物理学会出版的Choas Data Analyzer 软件对所采集的HRV 进行非线性动力学分析，并与心排血量比较，分析其相关性。

Methods A rat model of MODS was reproduced by occluding the superior mesenteric artery for 45 minutes followed by reperfusion for 6 hours.

采用随机分组方法，用夹闭肠系膜动脉根部45 min、再灌注6 h制备大鼠MODS模型。

PAA/PVA IPN hydrogels were prepared by a sequential method by which acrylic acid firstly. polymerizes and cross-links in PVA/water solution with UV irradiation,then PVA physical cross-linked hydrogels are formed in cross-linked PAA networksby freezing-thawing. The orthogonal test design method was used to optimize theexperimental conditions based on the mechanical and swelling properties of thehydrogels. The effect of the PAA and crosslinking agent contents on the microscopicmorphology of the PAA/PVA IPN xerogel was investigated by transmission electronmicroscopy, and on the mechanical properties of the hydogels was studied bymeasurements of mechanical properties.

针对水凝胶强度、生物相容性和刺激响应性的需要，选择了以PVA和PAA为复合水凝胶的基本分子结构；采用顺序IPN方法制备PAA／PVA IPN水凝胶，即将单体丙烯酸与PVA溶液共混，AA经紫外光辐射聚合交联在PVA溶液中形成PAA化学交联网络，再经冰冻—解冻循环过程在PAA网络内形成PVA物理交联网络。

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