肌苷在玻碳电极上的伏安法研究

应用线性扫描伏安法（LSV），微分脉冲伏安法（DPV）和循环伏安法（CV）对肌苷在玻碳电极（GCE）上的阳级伏安行为进行了研究，发现在0．1mol/L磷酸氢二纳溶液中，于1．42V（vs.Ag／AgCl）左右产生一个阳极氧化峰，峰电流与肌苷浓度在5×10-4～8×10-2g/L范围内呈线性关系，峰电位随溶液pH值增加而降低。肌苷在与次黄嘌呤、黄嘌呤、尿酸共存时，可得4个分辨良好的阳极氧化峰，它们的峰电位分别为1．42V、1．07V、0．72V和0．26V。用本法不需分离直接测定了药物针剂和加标尿样。实验结果表明肌苷的电极反应为扩散控制不可逆过程。

关于双乙酸钠的分子式

在研究成功双乙酸钠零污染合成工艺的基础上 ,培养成功了晶型完美的大尺寸晶体和适宜进行X光结构分析的小尺寸单晶 ,并进一步应用四圆衍射仪测得其晶体结构。结果表明在双乙酸钠分子中不存在相对独立的水分子或乙酸分子 ,为纠正目前在文献和应用上关于双乙酸钠分子式写法上存在的混乱 ,作者根据结构测定和元素分析等结果提出了双乙酸钠分子式的合理写法 :(CH3COO) 2 Hna

Study of molecular order in organo-soluble polyimide thin films

The changes in refractive indices (n(TE) and n(TM)) in a direction normal to the plane of thin films of an organo-soluble polyimide based on 1,4-bis(3,4-dicarboxyphenoxy) benzene dianhydride and 2,2'-dimethyl-4,4'-methylene dianiline were measured by a prism coupler. The results implied that the molecules near the substrate-polyimide interface were much ordered, while those near the polyimide-air interface were less ordered, judging from the variation in the level of negative birefringence with the depth of the films. The molecules are more condensed near the substrate surface, as seen by the average refractive index increasing from the polyimide-air interface to the substrate-polyimide interface, which implies that the condensed states of polyimide molecules change gradually in the depth direction. (C) 1997 Elsevier Science B.V.

Effect of F- axial coordination on the electrochemistry of (TPP)Co

The axial coordination effect of F- on the redox behavior of (TPP)Co was investigated and spectroeletrochemistry in dichloroethane. It was verified that mono(F-) axial adduct (TPP)Co(II)(F-) could be reduced at 0.1 V(SCE). and bis(F-) axis adduct (TPP)Co(II)(F-)(2) formed with added F- molar ratio>1 could be reduced at the potential <-0.6 V(SCE). The equilibrium between (TPP)Co(II)(F-) and (TPP)Co(II)(F-)(2) was demonstrated.

流动注射化学发光检测法的进展

评述了近年来流动注射化学发光检测法及生物发光检测法的最新进展。内容涉及各类化学发光反应、生物发光反应和电致化学发光反应同流动注射体系的耦合方式，仪器设计，多种无机、有机、生物大分子、生物活性物质及药物的分析方法及其在环境、生物医学科学和生命科学、临床化学及药物化学中的应用和发展方向，引用文献124篇。

精细胶粉的应用研究

研究了６０，８０，１００，１２０目等４种精细胶粉（ＦＲＰ）的基本性能及其在胎面胶中的应用。结果表明，随ＦＲＰ精细化程度增加，掺用５０份ＦＲＰ后ＮＲ硫化胶的拉伸强度和扯断伸长率均有所提高；ＮＲ／ＢＲ并用胎面胶混炼胶的门尼粘度降低，胶料流动性增加，挤出物外观等级提高；ＮＲ／ＢＲ共混硫化胶的拉伸强度、扯断伸长率及热空气老化系数提高，撕裂强度和邵尔Ａ型硬度有所下降，而生热、动态疲劳和磨耗量等均在８０～１００目处出现最佳值。随着ＦＲＰ用量的增加，ＮＲ／ＢＲ硫化胶的拉伸强度、撕裂强度和弹性降低，生热增加，动态疲劳和热空气老化性能则有所改善。

二甲基亚砜在稀土穴醚配合物中配位行为的电化学研究

二甲基亚砜在稀土穴醚配合物中配位行为的电化学研究刘世昌（内蒙古师范大学化学系，呼和浩特０１００２２）朱天培（中国科学院长春应用化学研究所，长春１３００２２）有关穴醚与稀土金属离子配合物的性质以及关于它们的电化学方面的研究均尚少￣［１－５］，且不系统。...

两种高Tg非线性光学聚合物母体及掺杂、极化的研究

利用具有非线性光学活性的对硝基苯胺掺杂高玻璃化转变温度的聚芳醚砜(PES-C)和聚芳醚酮(PEK-C),得到了两种掺杂含量较高的掺杂型非线性光学聚合物体系。电晕极化表明较高的取向和较慢的松驰。

AMPEROMETRIC GLUCOSE SENSOR WITH FERROCENE AS AN ELECTRON-TRANSFER MEDIATOR

A glucose oxidase (GOD) electrode with ferrocene (Fc) used as an electron transfer mediator has been described. Using Nafion, Fc was modified on a glassy carbon (GC) electrode surface, and glucose oxidase was then immobilized on the Fc-Nafion film, forming a GOD-Fc-Nafion enzyme electrode. The preparation method was quite simple and rapid. The enzyme electrode showed a reversible reaction of the redox couple (Fc+/Fc), used in a biosensor system, displayed a sensitive catalytic current response (response time was less than 20 s) on variation of the glucose concentration, with a wide linear range up to 16 mM and with good repeatability. The enzyme electrode showed almost no deterioration over the course of three weeks. There was little or no interference from electro-active anions, such as ascorbic acid, to the determination of glucose based on Nafion film and lower oxidizing potentials of the enzyme electrode.

钙钛矿型LnGaO_3(Ln=La、Pr、Nd)晶体的光谱性质

本文报导了室温下钙钛矿型LnGaO_3(Ln=La、Pr、Nb)晶体的紫外、可见和红外吸收光谱的测定,对主要谱带进行了归属。从理论上计算出点阵振动数目和对称类型,并与实验结果进行了对比。晶体的色心及退火对吸收光谱的影响也做了研究。首次得到LaGaO_3和PrGaO_3晶体室温下的激发光谱和荧光光谱,观察到由于晶场环境不同引起荧光谱线窄化的现象。发现LaGaO_3晶体能够产主峰值为540nm的可见荧光,有成为色心发光晶体的可能性。

可变误差多面体法测定铝合金中钇及稀土总量

本文把计算机和分光光度法结合起来,根据DBC-偶氮氯膦与稀土元素形成有色配合物的吸光系数之间的差异,把十五个稀土元素分为六个组分(加上显色剂共七个组分),利用可变误差多面体法对数据进行处理,以期解决铝合金中钇及稀土总量的测定问题。实验结果令人满意。