麻黄中伪麻黄碱在小鼠组织中的分布研究

为了解麻黄(Herba ephedrae,简称HE)中伪麻黄碱(Pseudoephedrine,简称PE)在小鼠脑、肺、心、肝、肾的分布变化,探讨HE的归经,用GC-MS/SIM法,分析了用药后30、60、120 min PE在小鼠脏器分布量。结果表明,PE于不同时间点在小鼠脏器的分布由多到少的顺序是:30 min时,肺脏(肾脏、肝脏、脑),心脏;60 min时,肾脏,心脏(肝脏),脑,肺脏;120 min时,脑,肾脏,心脏,肝脏(肺脏)。本试验从PE在小鼠体内脏器的分布量初步反映了HE的归经趋势。     

Y2O2S∶Eu3+,Mg2+,Ti4+长余辉材料制备中烧结条件和助熔剂的影响

Y2O2S∶Eu3+;Mg2+;Ti4+长余辉材料制备中烧结条件和助熔剂的影响;Y2O2S∶Eu3+;Mg2+;Ti4+; 烧结条件; 助熔剂; 发光性质     

铁形态分析进展

本文对Fe（Ⅱ）、Fe（Ⅲ）形态分析在1990－2000年间的发展概况作了综述，内容包括分光光度法、色谱法、流动注射分析法等。引用文献53篇。     

纳米PbSnO3的制备及其燃烧催化性能的研究

Nanocomposite PbSnO₃was synthesized by coprecipitation method , and its phase evolution process was investigated. The particle size, crystal form, and phase of samples were determined with XRD, TEM and EDS. The catalytic actiyity of sample on the thermal decomposition of RDX was investigated by DSC. The results show that nanocomposite PbSnO₃with the diameter of 9 nm can be obtained by calcining at 600 ℃ for 2 h, which crystal is cubic (pyrochlore type). The catalytic actiyity of nanocomposite PbSnO₃on the thermal decomposition of RDX is much higher than that of normal PbSnO₃. The nanocomposite PbSnO₃can decrease the peak temperature of thermal decomposition of RDX from 240.1 ℃ to 236.5 ℃, and the decomposition enthalpy ΔH of RDX increases 722 J·g^-1 （about 70%）.     

氨基酸与钠离子非共价键相互作用的电喷雾质谱研究

实验研究中常常观察到钠离子与一些多肽或蛋白质有较强的非共价键结合能力,这种非共价键相互作用可能与生物的一些功能和活性有关。为了进一步了解这一结合作用,我们应用电喷雾质谱研究了常见的20种氨基酸与钠离子在溶液中的非共价键相互作用。实验研究中发现脯氨酸和苯丙胺酸与钠离子有较强的非共价键结合能力。     

以磷钨杂多酸银盐为催化剂合成丁酮乙二醇缩酮

以磷钨杂多酸银盐(AgxH3-xPW12O40,0相似文献   

Synthesis, Structure and Secondorder Nonlinear Optical Activities of a New Tungsten（0） Compound with Pyridine-2-thiolato Ligand, [Et4N][W（pyS）（CO）4] （pys = C5H4NS^-）

The reaction of W(CO)6 with pyOSNa (C5-H4NOSNa) and Et4NCl in MeCN affords a new tungsten(0) complex [Et4N][W(pyS)(CO)4] 1 (Mr.= 536.29).The crystal and molecular structures have been determined by X-ray single-crystal diffraction.Complex 1 crystallizes in the orthorhombic system,space group P212121 with a = 8.2429(5),b = 9.1045(4),c =26.8851(14) (A),β = 90.00°,V= 2017.66(18) (A)3,Z = 4,Dc.= 1.765 g/cm3,μ = 58.51 cm-1,F(000) =1048,the final R = 0.0204 and wR = 0.0400 for 4432 observed reflections with I ＞ 2σ(I).X-ray structure analysis revealed that the molecule is acentric and has large first-order hyperpolarizability (7.2 × 10-30 esu),so it could be an IR second-order nonlinear optical candidate material.     

三甘氨酸双11钨硅双核稀土杂多配合物的合成与性质

利用一缺位杂多酸对一维链式配合物的断链取代反应,合成了未见文献报道的以甘氨酸为桥联配体的双核稀土杂多配合物,其结构简式为K₁₀[(O₃₉W₁₁Si)RE(Gly)₃RE(SiW₁₁O₃₉)]·9H₂O(RE=La,Pr,Nd,Sm,Eu,Gd,Tb,Dy,Y;Gly=NH₃⁺CH₂COO<     

4，4＇－偶氮二［4－氰基戊酰（对－二甲氨基）苯胺］作为引发剂的嵌段共聚物合成

his paper describes a new polyfimctional inihator, 4,4'-azobis[4-cyanopentanoyl (p-dimethylandno)anilide] (ACPDA), for the the radical polymerization. It was obtained by the rcaction of 4,4'-azobis(4-cyanopentanoyl chloride) with p-amino-N, N-dimethylaniline' ACPDA contains two reaction centres with different reactvities that are azo-group and N, N-dimethylaniline-group. By the controlled different conditions this initator can be utilized to make block polymers.     

毛细管电泳-质谱联用法测定性保健品中的脱水吗啡和西地那非

脱水吗啡和西地那非是目前治疗男性性功能障碍的常用药物,在临床上已广泛应用。但最近的研究表明,当服用西地那非剂量较大时会引起头痛、消化不良、头晕、皮疹等不良反应。更为严重的是,西地那非能增强硝酸酯类药物的降压能力,与硝酸酯类药物同时使用时,可能会引起致命性低血压