生物降解性聚酯

本文阐述了生物降解性聚酯的主要产品，生物降解性聚酯的降解机理及生物降解性聚合物的存在问题和研究方向．     

生物降解型聚氨酯研究进展

本文综述了生物降解型聚氨酯的研究现状，并探讨了影响其生物降解性的因素，指出了其应用前景，特别是医学上的应用．     

热固性可生物降解弹性体研究进展

热固性可生物降解弹性体是高分子材料的一种,由于具有可生物降解性,以及与人体组织相匹配的弹性、柔韧性和力学性能,因而有广阔的医疗应用前景.作者综述了热固性可生物降解弹性体的研究进展.     

医用可生物降解高分子材料

对目前医用可生物降解高分子材料的研究及应用状况分化学合成，天然和生物技术合成三类作了综述。对材料的生物相容性、可生物降解性及物理机械性能进行了分析和比较。并就医用生物降解高分子材料的发展趋势作了预测。     

不同类型表面活性剂的生物降解

对表面活性剂的生物降解性进行了概述。着重讨论了不同类型表面活性剂的生物降解性能与结构的关系,并展望了我国表面活性剂生物降解研究的发展方向。     

PBS基生物降解材料的研究进展

PBS(聚丁二酸丁二醇酯 )是一种具有良好生物降解性的聚酯塑料。本文简述了PBS的基本特性、降解机理和制备方法 ,对各种PBS基生物降解材料的特性进行了分析 ,介绍了PBS基生物降解材料的研究进展     

应用于药物控释系统中的生物降解高分子材料

生物降解高分子材料具有良好的生物相容性和生物降解性而成为人们关注的药物控释材料。本文简要介绍了生物降解高分子材料的降解机理，综述了生物降解高分子材料的发展现状，展望了今后的发展方向。     

生物降解塑料研究进展

综述了国内外生物降解塑料的现状与发展趋势 ,介绍了生物降解塑料的分类、影响生物降解的因素、生物降解的表征以及生物降解塑料的发展方向     

生物降解材料

本文介绍了生物降解材料的含义、作用机理、影响微生物降解的因素、以及生物降解材料的应用,并列举了几种主要的可生物降解的材料。     

可生物降解的冷冻机油

用CEC(欧洲协作委员会 )生物降解性试验方法研究了与R - 1 34a相匹配的冷冻机油———改性聚醚 (PAG)系列和多元醇酯 (POE)系列的生物降解规律 ,并经过适当的调配 ,使之不但满足于压缩机的运转要求 ,还符合环保要求     

09CuPTi(RE)耐候钢中稀土作用机制研究

在冶金物理化学平衡实验的基础上研究得到了铈分别与铜、磷、钛在铁基溶液中的相互作用规律。通过金相、电子探针分析了晶粒度及夹杂物，并通过盐雾、恒温恒湿室内加速腐蚀试验，锈层逐层剥离x射线分析等手段研究和分析了稀土在Cu-P系耐候钢中的作用机制。     

实验室信息管理系统研究与开发

给出了实验室信息管理系统的研究思路和开发方法，介绍了此系统的主要模块的功能和特点。     

Two-dimensional RPLC-RPLC system with different pH in two dimensions for separation of alkaloids from Corydalis yanhusuo W. T. Wang

An effective method utilizing the same RP chromatographic column with different pH in first and second LC dimensions has been developed for separation of the basic compounds from traditional Chinese medicines (TCMs). In this work, the alkaloids in Corydalis yanhusuo which is an important TCM were selected as a model to develop the method. The additives and pH values of the mobile phase were optimized in this work. To investigate the feasibility of this method, off-line mode separation was performed in the experiments. According to the UV-absorption intensity, there were eight fractions collected in acidic conditions. All the fractions were analyzed in basic conditions. The results showed that the chromatographic selectivities were significantly different in the separations performed with acidic and alkaline elution systems. Complementary separation was achieved in this work. It is demonstrated that this method would be an effective tool for alkaloids research. Based on the different pH of the mobile phase in this method, it could also be suitable to analyze compounds which were sensible to the pH of the solution.     

Vapor–liquid equilibrium of the (water + ethanol + glycerol) system: Experimental and modelling data at normal pressure

In this work, vapor-liquid equilibrium data of the ethanol–water–glycerol system were measured in an Othmer-type ebulliometer at normal pressure. The choice for this system was due to the importance of the ethanol–water separation. The samples analyses were done in a digital densimeter, and the methodology was previously validated with data available in the literature. Since the mean relative deviation was less than 5% in temperature and vapor composition, new data from mixtures of ethanol–water–glycerol were obtained. The experiments showed that glycerol is a promising solvent to ethanol dehydration since it eliminates the azeotrope and promotes the production of anhydrous ethanol. A thermodynamic model for this system was developed using the NRTL model to describe the non-ideality of the liquid phase. The modeling results were compared with experimental data and the deviations were lower than 7%. In this way, the model developed in this work can be used for simulation of ethanol dehydration.     

Thermoanalytical study of nimesulide and their recrystallization products obtained from solutions of several alcohols

Thermogravimetry, differential scanning calorimetry, and vibrational infrared spectroscopy were used to study nimesulide and its recrystallization products that were obtained from solutions of several alcohols. The thermoanalytical measurements were performed in both air and nitrogen atmospheres and the results suggest that, under the experimental conditions used in this paper, it was possible to obtain neither polymorphic nor pseudopolymorphic forms of this drug. In this investigation, quantum chemical approach methods were used to determine the molecular structures using the Becke three-parameter hybrid method and the Lee–Yang–Parr correlation functional. The performed molecular calculations were done with the Gaussian 09 routine and the theoretical calculation results were correlated with the experimental IR vibrational spectrum.     

异辛醇中酶催化高效合成阿莫西林的研究

通过比较6种有机溶剂作为反应介质时对阿莫西林合成的影响,发现反应介质在保持酶的催化活性和稳定性方面发挥着非常重要的作用,确定异辛醇为酶催化合成阿莫西林的反应介质.通过研究不同温度下异辛醇中酶催化合成阿莫西林的时间曲线,确定了最佳反应温度和反应时间,通过对底物浓度和酶浓度进行响应面优化,最终得到阿莫西林合成的最优反应条件,在最优条件下可得到91.37%的最大阿莫西林产率.     

对二甲苯电合成法制备对甲苯甲醛的气相色谱分析

研究了对甲苯甲醛的气相色谱分析条件。分别选用８％ＯＶ－２１０,１０％ＱＦ－１和８％ＤＣ－２００为固定相测定对甲基苯甲醛的含量。结果表明：本方法快速,准确,标准偏差小于０．２％,回收率为１００．５％￣１０１．０％。     

光导纤维光谱电化学池的研制及初步应用

研制了光导纤维光谱电化学池(FOSECC),并用该池研究Fe(CN)₆^3-/Fe(CN)₆^4-一氧化还原体系。获得不同电位下的吸收光谱;在不同温度下分别测定了式量电位E°′和反应得失电子数n;求出了体系电极反应的△H°和△S°;计算了FOSECC的灵敏度--摩尔吸收/电位比,结果满意。     

DNA编码序列的图形表示及相似度计算

将DNA编码序列转化为图,然后计算得图的不变量-分子连接性指数,由所得的拓扑指数对DNA编码序列进行相似度比较以确认其同源性,得到了较好的结果.     

Use of the hexane-2,2,2-trifluoroethanol system in partition chromatography

The use of the hexane-2,2,2-trifluoroethanol heterophase system of solvents in partition chromatography is characterized. Gas-chromatographic retention indices and partition coefficients are used for the identification of organic compounds in this technique. The partition coefficients of compounds from 12 homologous series were measured in this heterophase system, and parameters for their group identification were calculated. The examples of the use of this system for solving different analytical problems are considered.