钇-铕-美他环素-CTMAB稀土共发光体系的研究及分析应用

利用荧光光谱法研究了钇-铕-美他环素(MTC)-CTMAB体系的稀土共发光效应,最佳形成条件,并对其作用机理进行了探讨,提出了测定MTC的荧光分光光度法。结果表明,共发光体系的荧光强度与MTC的浓度在1.0×10-7mol/L~1.5×10-5mol/L范围内呈良好的线性关系,其检出限为3.6×10-8mol/L。采用标准加入法测定了药物制剂中的MTC。     

Specific Proteins in the Indirect Somatic Embryogenesis of Freesia

Using the young inflorescence segments of Freesia refracta as explants, indirect somatic embryogenesis of somatic cells was induced in a N6 medium supplemented with some exogenous hormones. SDS-polyacrylamide gel electrophoresis（SDS-PAGE） was used for the analysis of soluble proteins produced during the somatic embryogenesis of this plant. There are six polypeptides, which might play some roles in the process of somatic embryo development. Tltree polypeptides（45, 53 and 55 kD） were detected in the stages of embryogenic callus, globular embryoid, and embryoid with coleoptiles, except the embryoid with leaf. One polypeptide（ 83 kD） was specific for the stages of embryoid with eoleoptiles and embryoid with leaf. One polypeptide（37 kD） was detected in the first two stages, namely, embryogenic callus and globular embryoid. One polypeptide（35 kD） was regularly synthesized in each stage, from embryogenic callus to embryoid with leaf.     

Study on Electrochemical Copolymerization of Aniline and 3-Methylthiophene in HMIMBF4 Ionic Liquid and Its Properties

Electrochemical polymerization of aniline and 3-methylthiophene has been accomplished in 1-methylimidazium tetrafluoroborate （HMIMBF4） ionic liquid. Homopolymer and copolymers of aniline and 3-methylthiophene were obtained successfully. The copolymer was studied by cyclic voltammetry and electrochemical impedance spectroscopy. The formation of copolymer has been confirmed by FT-IR and UV spectra. The atomic force microscope （AFM） was used for microstructural analysis. Both the homopolymer and the copolymer had the catalytic activity for the hydroquinone.     

A Portable Liquid Scintillation Counter for General LSC and High Sensitivity Alpha-Counting Applications

Applicability of a new portable, single tube liquid scintillation (LS) spectrometer was demonstrated for general LS applications, such as wipe tests and low level alpha counting, especially radon (²²²Rn) measurements in water. Wipe tests were performed with wad sticks. They were counted conventionally in a small volume in Eppendorf tubes with less than 200µl of LS cocktail, thus minimizing costs and waste. Small volume is specially recommended because low background can be achieved without heavy lead shielding, thus maintaining portability. Typical NRC recommended LLD's were reached for ³H and other typical LS isotopes. For ²²²Rn in water a biphasic extraction system was adopted where radon is extracted from water into a water-immiscible LS cocktail. The method is sensitive because radon can be extracted from a large water volume. It was observed that common non-evaporating "safe" cocktails with di-isopropyl naphtalene solvent are convenient to use and quite suitable for extraction. Also the isotope ²²⁶Ra can be reliably measured via production of its daughter ²²²Rn. The instrument includes pulse shape electronics to perform alpha/beta separation. This is based on the fact that in LS cocktails alphas generate pulses with longer duration than betas. The alpha/beta separation can be visualized with a two dimensional graph where the x-axis represents pulse amplitude (MCA channels) and the y-axis its length. The graphical operations are all done in standard Excel/Windows environment. Due to their longer pulses, alphas have greater y-coordinates than betas with the same x-coordinate (amplitude). With this graph, one can select a region occupied only by alphas and exclude betas. The above mentioned "safe" cocktails posses good alpha/beta separation properties. Because natural background (cosmic-rays and environmental gammas) produces beta-like pulses, they can be stripped away giving low background for alpha counting, typically a few counts per hour for the extraction samples. The LLD for ²²²Rn was 0.1 Bq/I.     

A Special Two-Soliton Solution of sine-Gordon Equation

A special two-soliton solution of sine-Gordon equation is obtained by using the Hirota direct method. It is shown in a mass-centre system how two kinks move and interact with each other.     

常压和真空下球-盘摩擦副自生电势的试验研究

对常压和中真空条件下摩擦副自生电势进行了试验研究,具体分析了自生电势的特征频率,同时运用ＡＲＭＡ模型对自生电势信号进行了预测分析。结果表明：金属摩擦副自生电势的特征频率随外界气压（真空度）及载荷的改变而变化;自生电势具有较好的可预测性     

噁唑酮类化合物的合成及其抗炎活性

以马尿酸为原料,与取代苯甲醛经Erlenmeyer环合反应合成了8个噁唑酮类化合物（3a~3h）,其结构经¹H NMR, FT-IR和HR-MS确证。二甲苯致小鼠耳肿胀实验结果表明：3f［4,3,5-二甲氧基甲撑基）-2-苯基-4H-5-噁唑酮］抗炎活性最好,其抑制率为50.3%,优于阿司匹林（41.5%）。     

水下激光通信上行传输特性研究

采用谱分析的方法,建立三维随机海浪的模型;根据大气折射率高度模型,对变折射率大气进行分层。在理论上分析激光通过随机起伏的海面和折射率不均匀分布的大气后,到达卫星接收机平面时形成的光斑的形状、位置和大小。仿真结果表明,海面随机起伏对上行光传输的影响取决于发射光束覆盖的海面区域,即海面光斑的尺寸与海浪波长的相对关系。当海面光斑的尺寸相对很大或很小时,对上行光传输的影响可忽略;在其它情况下通过适当调整发射光束的宽度可以提高通信的质量和稳定性。     

乘幂法求矩阵特征向量与特征值的初始向量及循环控制

矩阵迭代法是求矩阵的第一阶特征值与特征向量的一种数值方法 .本文讨论了用矩阵迭代法求解矩阵的特征值与特征向量时的初始向量选取和循环控制条件     

高锰酸钾-甲醛-荧光素-没食子酸丙酯化学发光体系的研究

高锰酸钾-甲醛-荧光素-没食子酸丙酯在酸性介质中有较好的发光特性,在最佳实验条件下,当没食子酸丙酯溶液浓度在8.0×10-6～2.0×10-3g/L范围内与化学发光强度有良好的线性关系(r=0.9960),对1.0×10-3g/L的没食子酸丙酯溶液平行测定11次,RSD为1.9%,检出限为5.6×10-6g/L。该法用于食用调和油中没食子酸丙酯的测定,结果令人满意。