新型含胆酸功能基生物降解性水凝胶的合成与表征

合成了N-胆酰胺己基-甲基丙烯酰胺(CAHA)单体,将其与聚乳酸-聚乙二醇-聚乳酸双丙烯酸酯(APLEG)共聚制成了一种新型含胆酸功能基生物降解性水凝胶(CAHY).用红外(FT-IR)、核磁(H1NMR)、质谱(MS)、扫描电镜(SEM)、热重分析(TG)和示差热分析(DSC)研究了其结构与性能.结果表明:随着共聚物中胆酸单体(CAHA)比例的增大,干态CAHY水凝胶熔融温度及熔融焓变增大,热失重逐渐减小(300℃时总的热失重小于6%),而其孔状网络结构致密性增大,孔径变小(290μm～8μm).制得的CAHY水凝胶吸水溶胀率可达1300%～1700%.     

聚乙烯醇包埋龟裂链霉菌对水中Pb~(2 )吸附性能的研究

本文研究了聚乙烯醇包埋龟裂链霉菌菌丝体的包埋条件及包埋后对水中Pb2 的吸附作用。结果表明,包埋比例为3/1（W/W）,聚乙烯醇浓度为10%,海藻酸钠浓度0.2%,在含2?Cl2饱和硼酸溶液中固化24h是包埋反应的最佳条件。包埋后的饱和吸附量可达73.0mg/g,比未包埋龟裂链霉菌下降 47.1% 。pH值对吸附量的影响较包埋前下降。升高温度有利于吸附。     

Lipophilicity determination of N-( benzothiazol-2-yl )-α-amino alkyl phosphonic diesters by RP-HPLC and RP-HPTLC

Using methanol-water mixtures as the mobile phase,the chro-matographic retention parameters k' and Rf were determined by reversed-phase high-performance liquid chromatography(RP-HPLC)and reversed-phase high-performance thin-layer chromatography(RP-HPTLC)for N-(benzothiazol-2-yl)-o) amino alkyl phosphonic diesters and the correlation with lipophilicity parameter(ClogP)was established.Logkw values obtained from RP-HPLC and R values obtained from RP-HPTLC can be used to evaluate the lipophilicity of this kind of compounds.Chromatographic method is a good alternative for lipophilicity measurement.     

Syntheses and properties of new herbicidal 2-arylthio-1 ,2,4-triazolo[1,5-a] pyrimidine derivatives

In search of novel herbicides with high activity, a series of 2-arylthio-1,2,4- triazolo [1, 5-a ] pyrimidines (3) were synthesized by cyclization of 5-amino-3-arylthio-1,2,4-triazoles with 1,3-diketones or by the nucleophilic substitution of substituted thiophenols with 2-methylsulfonyl-1, 2, 4-triazolo [ 1, 5-a]-pyrimidine. The structures of all compounds prepared were confirmed by 1H NMR and MS spectroscopy along with elemental analyses. Preliminary bioassays indicated that some of the compounds 3 had good herbicidal activity against rape. In addition, the regioselectivity in the reaction of 5-amino-3-sub-stituted arylthio-1,2,4-triazoles with benzoylacetone was studied.     

Cancer classification based on microarray gene expression data using a principal component accumulation method

The classification of cancer is a major research topic in bioinformatics. The nature of high dimensionality and small size associated with gene expression data,however,makes the classification quite challenging. Although principal component analysis (PCA) is of particular interest for the high-dimensional data,it may overemphasize some aspects and ignore some other important information contained in the richly complex data,because it displays only the difference in the first twoor three-dimensional PC subsp...     

光弹性等倾线获取的图像处理技术

提出一种对数微分法,有效地解决了光弹性实验中等倾线的提取问题,不仅可消除平面偏振光场中等差线对等倾线的影响,而且能高精度地提取任意复杂受力模型等倾线.最后给出了等倾线提取及精度分析的两个实例,实验证明;本方法具有广阔的应用前景.     

Synthesis,Structure and Biological Activity of Zn(II) Complex with Tris(benzimidazol-2-yl-methyl)amine Ligand

Introduction Since the structures of superoxide dismutase (SOD) which appears to play an important role in both the animal and plant kingdoms to eliminate ·2O- and pro-tect living organisms from toxicity of ·2O- 1, exhibit that most of the coordinated atoms around metal ions are from imidazole groups of histidines which are the primary ligands in distorted coordination geometry2-4 in SOD, an important step should be designed to synthe-size the model compounds of SOD in which ligands shou…     

Preparation of the Thermoplastic Starch／Montmorillonite Nanocomposites by Melt-intercalation

In this paper, the conception of melt-intercalation was introduced into the natural polymer field, and the thermoplastic starch/ethanolamine-activated montmorillonite (TPS/EMMT)nanocomposites were prepared by extruding the composites of EMMT and TPS, plasticized with ethanolamine/formamide. Wide angle X-ray diffraction (WAXD) and transmission electron microscope (TEM) revealed that TPS was intercalated into the layers of EMMT successfully and formed the intercalation nanocomposites with EMMT. When EMMT content was wt.10%, the mechanical testing indicated that the tensile stress of the nanocomposites reached 9.69 MPa, and the tensile strain reached 74.07%, Youngs modulus increased from the 47.23 MPa of TPS to 184.11 MPa of TPS/EMMT nanocomposites, and breaking energy increased from 1.34 N.m to 2.15 N.m after they had been stored at RH25% for 14 days.     

富稀土元素合金中镧,铈,镨,钕,钐测定方法的研究

本文用美国Jarrell-Ash 9000型多道光量计,采用无基体匹配法对富稀土元素合金中镧、铈、镨、钕、钐进行了测定分析。对稀土元素较复杂的光谱干扰运用元素间干扰系数和自身干扰系数校正法进行校正。对其非光谱干扰采取加入内参比进行补偿。通过人工合成样分析和实际富稀土元素合金样品加标准回收实验,表明干扰系数内参比法是一种有前途的无基体匹配的定量分析法。