中国梨木虱分泌物中氨基酸的分离与分析

利用离子交换色谱法分离了中国梨木虱分泌物中的氨基酸;利用毛细管气相色谱法对梨木虱分泌物中氨基酸的三氯乙酰了酯衍生物进行了分析。用标准样对照定性,内标法定量。分泌物中共检出13种氨基酸。     

Syn thesis,Characterization of CoAPO-11 Molecular Sieve from a Nonaqueous System

CoAPO-11 molecular sieve with a high crystallinity was prepared by hydro thermal syn thesis from a non-aqueous system(EG) in the presence of Et₂NH or i-Pr₂NH as a structuredirecting agent. The X-ray diffraction(XRD) patterns, scanning electron micrographs(SEM) revealed that the product powder was pure, homogenous in particle-size. The X-ray powder diffraction data, compositional analysis, thermal stability analysis, UV-V is diffuse reflectance spectroscopic analysis showed that Co(Ⅱ) ions were incorporated in the aluminophosphate framework, tetrahedrally coordinated in the lattice of asprepared samples.     

以茜素兰S为电化学探针测定DNA的研究

在pH 4.5的0.2 mol/L Britton-Robinson(B-R)缓冲溶液中,茜素兰S(ABS)于-0.51 V(vs.SCE)产生一个灵敏的线性扫描二阶导数极谱还原峰。当在上述溶液中加入DNA后,茜素兰S在-0.51 V处还原峰的峰电流降低并且峰电位正移,说明两者之间可以通过嵌插作用而结合。结合反应的发生使溶液中游离的茜素兰S浓度降低,相应的还原峰电流降低。实验优化了结合反应条件和电化学测定条件。在最佳条件下,峰电流的降低值同DNA的浓度在1.0~60.0 mg/L范围内呈线性关系,线性回归方程为△ip″(nA)=18.13c(mg/L)-7.61(n=9,r=0.998)。方法应用于合成样品中DNA的测定,结果令人满意。     

微乳液增敏4, 5-二溴苯基荧光酮光度法测镉的研究

研究了CPC-OP微乳液存在下镉(Ⅱ)与4, 5-二溴苯基荧光酮(DBPF)的显色反应. 结果表明, CPC-OP微乳液的存在对镉(Ⅱ)与DBPF的显色反应有显著的增敏作用, 在pH 5.60的HAc-NaAc缓冲溶液中, 镉(Ⅱ)与DBPF形成13络合物, 表观摩尔吸收系数ε546=1.27×105 L·mol-1·cm-1, 线性范围 0～0.64 μg/mL. 应用本法可分析电镀废水和头发样品中的镉(Ⅱ).     

两种喷嘴喷射性能的试验研究

为比较自激振荡脉冲喷嘴和连续射流喷嘴的喷射性能,利用自行搭建的喷嘴性能测试装置对两种喷嘴的喷射性能进行了试验研究,实测了不同压力下两种喷嘴的时均喷液量,分析了不同口径的连续射流喷嘴和自激脉冲喷嘴的喷射特性,主要探讨了连续射流喷嘴、自激喷头下喷嘴直径对喷嘴喷液性能的影响,并进行了两种射流打击油泥样本的对比试验．试验结果表明,时均喷液特性相似的连续射流和脉冲射流在冲击油泥样本时,相同时间下脉冲射流的冲击破坏范围要大于连续射流,根据试验中油泥的屈服破坏过程,确定了射流有效打击力的临界值,建立射流清洗油泥时有效射程的经验估算式．     

An Extended Method for Constructing Travelling Wave Solutions to Nonlinear Partial Differential Equations

In this paper, an extended method is proposed for constructing new forms ofexact travelling wave solutions to nonlinear partial differential equations by making a more general transformation. For illustration, we apply the method to the asymmetric Nizhnik-Novikov-Vesselov equation and the coupled Drinfel‘d-Sokolov-Wilson equation and successfully cover the previously known travelling wave solutions found by Chen‘s method [Y. Chen, et al. Chaos, Solitons and Fractals 22 (2004) 675; Y. Chen, et al. Int. J. Mod. Phys. C 4 (2004) 595].     

Evolution of InAs islands in the Stranski-Krastanow mode of InAs/GaAs (001) fabricated using molecular beam epitaxy

Based on step-by-step observation using atomic force microscope, two distinctive successive phases were distinguished in accordance with evolution of the three-dimensional InAs islands during the Stranski-Krastanow mode of the InAs/GaAs (001) system fabricated using molecular-beam epitaxy. The initial phase is consistent with a power law, and the latter phase is a comparatively gradual one.     

吖啶橙与肝素钠相互作用的分光光度法研究

用分光光度法研究吖啶橙与肝素钠的结合反应,吖啶橙主要以静电作用的方式与肝素钠发生相互作用。在pH 2.0的Britton-Robinson(B-R)缓冲溶液中,吖啶橙在478和492 nm处有特征吸收峰,当加入肝素钠后,492 nm处的吸光度值强度降低且在453 nm处出现了一个新的吸收峰,说明两者之间发生了较强的相互作用形成了一种新的复合物,利用摩尔比法求解两者的结合比为1∶3。在最佳条件下,吸光度值的降低与肝素钠的浓度在3.0～15.0 mg·L-1范围内呈良好的线性关系,表观摩尔吸光系数ε=1.599×105 L·mol-1·cm-1,检测限(3σ)为0.236 mg·L-1。该方法简单、快速,应用于肝素钠注射液效价的测定,结果令人满意。     

STUDY ON THE SEQUENCE STRUCTURE OF SBR BY 13C-NMR METHOD Ⅱ. PEAK ASSIGNMENT FOR ALIPHATIC CARBONS SPECTRA

The study on ~(13)C-NMR spectra of aliphatic carbon region of emuision-processed and solution-processed (by lithium catalyst) SBR was carried out. The assignments for more than thirty odd peaks observed experimentally were made by using "corresponding analysis" method, combined with the empirical parameters reported in literature. The peak intensifies were calculated based on BemouUian statistic assumption.     

制备2，2′，4，4′-联苯四甲酸的新方法

氨基甲基苯甲酸;联苯四甲酸;合成;偶联;重氮盐