高等生物的遗传控制——从大豆mRNA处理的水稻后代种子内鉴别出大豆蛋白质

本文从大豆幼苗中分离出与poly A相连的RNA.将此RNA注入开花后的子房,并用此RNA处理水稻花药.处理过的花药经离体培养诱导出愈伤组织,再从愈伤组织诱导植株.通过免疫反应的实验发现,在上述两种处理过的后代种子中含有大豆的蛋白质,而对照无此蛋白.     

Optimization of Metamorphic InGaAs Quantum Wells on GaAs Grown by Molecular Beam Epitaxy

We investigate the molecular beam epitaxy growth of metamorphic InxGal-xAs materials （x up to 0.5） on GaAs substrates systematically. Optimization of structure design and growth parameters is aimed at obtaining smooth surface and high optical qualdty. The optimized structures have an average surface roughness of 0.9-1.8 nm. It is also proven by PL measurements that the optical properties of high indium content （55%） InGaAs quantum wells are improved apparently by defect reduction technique and by introducing Sb as a surfactant. These provide us new ways for growing device quality metamorphic structures on GaAs substrates with long-wavelength emissions.     

单壁碳纳米管吸附联苯类有机物的荧光光谱分析

利用芳香族化合物对单壁碳纳米管进行了化学修饰,并利用荧光光谱以及时间分辨光谱对修饰后的单壁碳纳米管进行了表征分析.实验发现吸附对三联苯后有1个荧光峰位置发生了蓝移,这说明吸附过程使对三联苯的一些能级分布发生了变化.测量吸附前后对三联苯和蒽甲醇的荧光寿命,发现吸附后的荧光衰减曲线下降趋势更加明显,对曲线进行多指数拟合得出的荧光寿命及其数目发生了变化,分析了可能导致该现象的原因.     

用蒙特卡罗方法模拟直接转换X射线探测器的响应特性

采用Monte Carlo方法模拟了HgI₂、非晶Se和CdTe几种直接X射线转换探测器在医用X射线范围(10—100keV)的透过谱、背向散射谱、吸收效率和光电灵敏度. 对X射线和HgI₂的作用过程模拟采用了EGSnrc Monte Carlo代码系统, 对信号电荷的产生考虑了电荷产生的高斯噪声和材料深陷阱作用造成的部分电荷收集影响. 结果表明, 载流子平均自由程(Schubweg)在相对于探测材料厚度较小时, 陷阱作用能很大地影响探测灵敏度. HgI₂的灵敏度是非晶Se的5倍以上, CdTe的灵敏度是非晶Se的10倍以上, 采用高Z序数材料可以大大提高探测灵敏度.     

Gain Measurement and Anomalous Decrease of Peak Gain at Long Wavelength for InAs/GaAs Quantum-Dot Lasers

Mode gain spectrum is measured by the Fourier series expansion method for InAs/GaAs quantum-dot （QD） lasers with seven stacks of QDs at different injection currents. Gain spectra with distinctive peaks are observed at the short and long wavelengths of about 1210nm and 1300nm. For a QD laser with the cavity length of 1060μm, the peak gain of the long wavelength first increases slowly or even decreases with the injection current as the peak gain of the short wavelength increases quickly, and finally increases quickly before approaching the saturated values as the injection current further increases.     

全二维气相色谱-飞行时间质谱分析焦化柴油中饱和烃的分子组成

建立了全二维气相色谱-飞行时间质谱(GC×GC-TOF MS)分析柴油馏分中饱和烃的分子组成的方法。结合谱库检索、质谱图解析、沸点与分子结构关系和全二维谱图特征,定性(或归类)了焦化柴油饱和烃组分中1057个化合物单体,其中正构烷烃排列规律性最强,一环~三环环烷烃按照极性和沸点的差异呈瓦片状分布在其上方。另外,还准确区分了在一维气相色谱上共流出的正构烷基环己烷和正构烷基环戊烷,以及正构 α 单烯烃。根据质谱采集的总离子流色谱图,采用峰面积归一化法得到了饱和烃组分的碳数分布结果,并将该方法应用于研究不同类型柴油馏分饱和烃的分子组成特点。结果表明,催化裂化和焦化柴油馏分饱和烃组分的化合物类型和分布各不相同。分子组成分析能为油品加工工艺机理的研究提供方法支持。     

The electrooxidation behavior of bilirubin in DMF and DMF + H_2O mixed solvent

The electrooxidation of Bilirubin (BR) in N,N'-dimethylformamide (DMF) and DMF + H_2O mixed solvent is investigated by voltammetry techniques, in situ rapid scan thin layer spectroelectrochemistry and in situ ESR spectroscopy. The data reveal that the oxidation process of BR undergoes many stages, which are all sped up by the introduction of water. The species of bilirubin taking part in the reaction is found to be changed from BR in DMF into BR' in the mixed solvents and the anodic peak potential is shifted correspondingly from +0.58 V to +0.026-+0.35 V (vs. Ag/AgCl, 1.0 M KCl). Free radicals and the dimerization of them are observed during the oxidation.     

基于铁催化的C-H键活化构建C-C键的研究进展

过渡金属催化的C-H键活化及在此基础上的C-C键形成的反应因其高原子经济性和高效的合成效率而备受人们的关注.铁元素具有含量丰富、廉价、易得、环境友好等优点,在催化反应中得到了越来越广泛的应用.近几年来,人们关于Fe催化的C-H键活化构建C-C键反应的研究也取得了一定的进展.本文对铁催化的C-H键活化构建C-C键的最新研究进展作了综述,并且按照铁催化剂的不同价态进行了分类归纳,也对催化机理进行了阐述与总结.     

Darboux Transformation for Drinfel'd-Sokolov-Wilson Equation

A coupled system known as the Drinfel'd-Sokolov-Wilson equation is reexamined. With the help of a Lax operator of fourth order, its proper Darboux transformation is constructed. Also, a nonlinear superposition formula is worked out for the associated Bäcklund transformation and some solutions are calculated.     

超高效液相色谱-串联质谱法测定烟用水基胶中邻苯二甲酸酯类化合物

建立了一种测定烟用水基胶中17种邻苯二甲酸酯类(PAEs)化合物的超高效液相色谱-串联质谱(UPLC-MS/MS)法。样品经水分散,以甲醇定容,涡旋振荡萃取。萃取液离心后,过有机相滤膜进行UPLC-MS/MS分析。通过增加延时柱的方法,排除色谱系统带入的PAEs干扰。结果表明:在0~5μg/m L范围内,方法的线性关系良好,相关系数均大于0.994,定量下限为0.010~0.479μg/g。该方法的回收率为87.6%~106.0%,相对标准偏差(RSD,n=6)为0.8%~6.2%。将该方法与YC/T 333-2010标准方法进行对比,结果显示两种方法的检测数据不存在显著性差异。方法用于烟用水基胶中17种PAEs的测定,操作简单,稳定性好。