邻二氮菲分光光度法测定头孢曲松钠粉针剂含量

在一定温度下,头孢曲松钠能将Fe(Ⅲ)还原成Fe(Ⅱ),还原生成的Fe(Ⅱ)在pH为5.0的CH3COOH-CH3COONa缓冲介质中,与邻二氮菲发生配位反应形成稳定的橘红色配合物,其最大吸收波长为510nm.建立了Fe(Ⅲ)-头孢曲松钠-邻二氮菲体系分光光度法间接测定头孢曲松钠的新方法.实验表明,在最佳的实验条件下,头孢曲松钠浓度在0.26~8.8μg/mL范围内与吸光度呈良好线性关系.线性回归方程为A=0.224 3C+0.058 5,线性相关系数R=0.998 4,表观摩尔吸光系数ε=1.48×105 L/(mol·cm),检出限为0.011μg/mL.该法用于分析注射用头孢曲松钠粉针剂的含量,回收率在97.5%~102.5%.     

二氯·菲咯啉二酮混配金属锰(Ⅱ)、铁(Ⅱ)、钴(Ⅱ)配合物的红外光谱与配位模式

报道了新近合成的二氯.邻菲咯啉-5,6-二酮混配锰(Ⅱ)、铁(Ⅱ)、钴(Ⅱ)配合物MLCl2(L=phen-5,6-dione,邻菲咯啉-5,6-二酮)红外光谱实验数据,利用群论方法分析了标题配合物MLCl2的简正坐标和配位模式,探讨了这类配合物的红外光谱与结构的关系.     

乙醇—硫酸铵-邻二氮菲体系萃取光度法测定铁的研究

利用乙醇-硫酸铵-邻二氮菲体系萃取光度法研究了Fe2 和邻二氮菲的最佳显色条件,完善了测定微量铁含量的操作条件,建立了一个方便、快速、准确的普遍使用于微量铁含量的分析方法。最大吸收波长痊于510nm、回归方程为y=0.008 1.626x,相关系数r=0.9987,摩尔吸光系数=ε9.4×104L/(m o l.cm),Fe(Ⅱ)在0-50μg范围内服从比尔定律。     

邻二氮菲-正丙醇-硫酸铵-抗坏血酸体系萃取分离和富集Fe(Ⅱ)

用可见分光光度法研究邻二氮菲-正丙醇-硫酸铵-抗坏血酸体系萃取分离和富集铁的行为及铁与一些金属离子分离的条件.结果表明,硫酸铵能使正丙醇的水溶液分成两相,在分相过程中,三元缔合物[Fe(phen)3]SO4能被正丙醇相完全萃取.当溶液中正丙醇、邻二氮菲和硫酸铵的浓度分别为30%(v/v)、7.0×10-4 mol/L和0.2 g/mL时,Fe(Ⅱ)的萃取率达到96.6%～98.4%,Co(Ⅱ)、Au(Ⅲ)、Ag(Ⅰ)、Ni(II)、Mg(Ⅱ)、Cr(Ⅲ)、Cu(Ⅱ)、Al(Ⅲ)、Hg(Ⅱ)、Pb(Ⅱ)和Cd(Ⅱ)基本不被萃取,实现了Fe(Ⅱ)与上述金属离子的分离.对合成水样中铁的分离和测定效果良好.     

天冬氨酸-邻二氮菲-Cu(Ⅱ)配合物与DNA相互作用及其对DNA的降解

利用循环伏安法研究天冬氨酸-邻二氮菲-Cu(Ⅱ)配合物([Cu(Phen)(Asp)]2+)与脱氧核糖核酸(DNA)之间的相互作用.结果表明,在pH6.8的磷酸盐缓冲溶液中,配合物[Cu(Phen) (Asp)]2+产生一对灵敏的氧化还原峰,峰电流随DNA浓度的增大而逐渐降低.在最佳实验条件下,测定线性范围为0.02-10.05 μg/mL,检出限为0.002 μg/mL,且研究该配合物存在条件下对DNA的电化学诱导降解.     

草酸根桥联的CdⅡ3FeⅢ异四核配合物的合成、表征和抗菌活性

合成了三种草酸根桥联的新型CdⅡ3FeⅢ异四核配合物[Cd3Fe(OX)3L6](ClO4)3,L分别为1,10-邻菲咯啉(phen);5-硝基-1,10-邻菲咯啉(NO2-phen);2,9-二甲基-1,10-邻菲咯啉(Me2-phen);OX表示草酸根阴离子.经元素分析、摩尔电导的测定以及红外光谱的研究,已推断这些配合物具有草酸根结构,其中Cd(Ⅱ)和Fe(Ⅲ)离子均处于八面体构型.测试了这些配合物的抗菌活性,结果表明,这些异四核配合物的抑菌活性优于配体的抑菌活性.     

以磷酸为掩蔽剂的铁(Ⅱ)-邻二氮菲分光光度法间接测定雪莲果中维生素C含量

利用维生素C定量将铁(Ⅲ)还原为铁(Ⅱ),铁(Ⅱ)与邻二氮菲发生显色反应,多余的铁(Ⅲ)用磷酸溶液掩蔽.结果表明,在pH=4.0的溶液中,维生素C的线性范围为0～12.8μg.mL-1,表观摩尔吸收系数ε=2.03×104L.mol-.1cm-1,加标回收率为97.3%～98.5%,变异系数为1.1%.该方法简便、准确、灵敏,是测量新鲜雪莲果中维生素C的一种有效方法.     

邻菲啰啉铋配合物的合成和与DNA的相互作用

合成了邻菲啰啉铋配合物[Bi(phen)2(NO3)3](phen=1,10-邻菲啰啉),利用单晶X-射线衍射技术测定了该配合物的晶体结构.通过紫外吸收、荧光和圆二色光谱法研究了配合物与小牛胸腺DNA(CT-DNA)的相互作用.结果表明配合物与DNA作用方式为插入模式,计算得到了配合物与DNA的结合常数Kb为1.11×105 L·mol-1,配合物对EB-DNA体系的荧光猝灭常数Ksq为2.23.圆二色光谱表明配合物的加入引起了CT-DNA分子中碱基对π-π堆积的变化,使其构象发生了变化.     

六氮杂镍配合物与DNA相互作用的研究

合成了六氮杂镍的配合物(Ni(Ⅱ)L-1,8-二羟基乙基-1,3,6,8,10,13-六氮十四烷高氯酸镍).用电化学、荧光光谱及黏度等方法研究了配合物与小牛胸腺DNA(ct-DNA)的相互作用.电化学实验表明,Ni(Ⅱ)L在Tris-HCl缓冲溶液(pH=7.3)中的氧化还原是1电子转移过程,Ni(Ⅱ)和Ni(Ⅲ)配合物对DNA键合常数的比值(K2 /K3 )为3.2;荧光实验表明该配合物与DNA具有明显的嵌插作用,其结合常数为2.15×104L/mol;黏度实验表明Ni(Ⅱ)L可使DNA发生卷曲或扭结作用.实验均表明Ni(Ⅱ)L和DNA相互作用为部分嵌插和部分沟谷结合的混合模式.在H2O2存在下,凝胶电泳和高效液相色谱方法证明Ni(Ⅱ)L对ct-DNA和pBR322 DNA的劈裂能力均增强.     

邻菲罗啉衍生物铜(Ⅱ)配合物作为模拟酶催化酯水解反应动力学及机理研究

研究了2,9-二(n-5,’8’-二氮杂壬烷基)-1,10-邻菲罗啉合铜(Ⅱ)配合物作为水解酶模拟物催化4-硝基苯酚醋酸酯(NA)水解反应动力学.在pH为7.4~9.2范围内配体与铜(Ⅱ)形成了1∶1(配体∶铜离子)配合物.结果表明,催化水解速率对NA及配合物浓度皆呈一级反应,其水解速率方程为v=koTbs[NA]=(koMbsL[ML]T kOH-[OH-] k0 i)[NA],二级反应速率常数kMLH-1在一定范围内随pH值的增加而增加;kMLH-1的最大值和kOH分别为0.131,18.22 mol-1.dm3.s-1,k0为NA的溶剂水解常数,k0=1.26×10-6s-1((25.0±0.1)℃,I=0.10 mol/L KNO3,0.020 mol/L Tris缓冲溶液);kMLH-1值显示该配合物催化活性较高,表明Cu(Ⅱ)配合物中的Cu…OH-是有效的亲核试剂,对底物NA酯的水解有较好的催化作用.同时,依据实验结果提出了催化反应的机理.     

Markedness and its Interpretation in Language Use

Language markedness is a common phenomenon in languages, and is reflected from hearing, vision and sense, i.e. the variation in the three aspects such as phonology, morphology and semantics. This paper focuses on the interpretation of markedness in language use following the three perspectives, i.e. pragmatic interpretation, psychological interpretation and cognitive interpretation, with an aim to define the function of markedness.     

Features of Women's language

Language is a means of verbal communication. People use language to communicate with each other. In the society, no two speakers are exactly alike in the way of speaking. Some differences are due to age, gender, statue and personality. Above all, gender is one of the obvious reasons. The writer of this paper tries to describe the features of women＇s language from these perspectives： pronunciation, intonation, diction, subjects, grammar and discourse. From the discussion of the features of women＇s language, more attention should be paid to language use in social context. What＇s more, the linguistic phenomena in a speaking community can be understood more thoroughly.     

Characterization of Ordovician carbonate reservoirs, southeastern Saskatchewan, Canada

The discovery of the prolific Ordovician Red River reservoirs in 1995 in southeastern Saskatchewan was the catalyst for extensive exploration activity which resulted in the discovery of more than 15 new Red River pools. The best yields of Red River production to date have been from dolomite reservoirs. Understanding the processes of dolomitization is, therefore, crucial for the prediction of the connectivity, spatial distribution and heterogeneity of dolomite reservoirs.The Red River reservoirs in the Midale area consist of 3～4 thin dolomitized zones, with a total thickness of about 20 m, which occur at the top of the Yeoman Formation. Two types of replacement dolomite were recognized in the Red River reservoir: dolomitized burrow infills and dolomitized host matrix. The spatial distribution of dolomite suggests that burrowing organisms played an important role in facilitating the fluid flow in the backfilled sediments. This resulted in penecontemporaneous dolomitization of burrow infills by normal seawater. The dolomite in the host matrix is interpreted as having occurred at shallow burial by evaporitic seawater during precipitation of Lake Almar anhydrite that immediately overlies the Yeoman Formation. However, the low δ18O values of dolomited burrow infills (-5.9‰～ -7.8‰, PDB) and matrix dolomites (-6.6‰～ -8.1‰, avg. -7.4‰ PDB) compared to the estimated values for the late Ordovician marine dolomite could be attributed to modification and alteration of dolomite at higher temperatures during deeper burial, which could also be responsible for its 87Sr/86Sr ratios (0.7084～0.7088) that are higher than suggested for the late Ordovician seawaters (0.7078～0.7080). The trace amounts of saddle dolomite cement in the Red River carbonates are probably related to "cannibalization" of earlier replacement dolomite during the chemical compaction.     

低渗透非均质砂岩油藏启动压力梯度研究

理论推导与室内实验相结合,建立了低渗透非均质砂岩油藏启动压力梯度确定方法。首先借助油藏流场与电场相似的原理,推导了非均质砂岩油藏启动压力梯度计算公式。其次基于稳定流实验方法,建立了非均质砂岩油藏启动压力梯度测试方法。结果表明:低渗透非均质砂岩油藏的启动压力梯度确定遵循两个等效原则。平面非均质油藏的启动压力梯度等于各级渗透率段的启动压力梯度关于长度的加权平均;纵向非均质油藏的启动压力梯度等于各渗透率层的启动压力梯度关于渗透率与渗流面积乘积的加权平均。研究成果可用于有效指导低渗透非均质砂岩油藏的合理井距确定,促进该类油藏的高效开发。     

On Tragic Consciousness In The Works By Ernest Hemingway

As an American modern novelist who were famous in the literary world, Hemingway was not a person who always followed the trend but a sharp observer. At the same time, he was a tragedy maestro, he paid great attention on existence, fate and end-result. The dramatis personae's tragedy of his works was an extreme limit by all means tragedy on the meaning of fearless challenge that failed. The beauty of tragedy was not produced on the destruction of life, but now this kind of value was in the impact activity. They performed for the reader about the tragedy on challenging for the limit and the death.     

A computer generator for randomly layered structures

AcomputergeneratorforrandomlylayeredstructuresYUJia shun1,2,HEZhen hua2(1.TheInstituteofGeologicalandNuclearSciences,NewZealand;2.StateKeyLaboratoryofOilandGasReservoirGeologyandExploitation,ChengduUniversityofTechnology,China)Abstract:Analgorithmisintrod…     

An Index mechanism for multi-scale view in spatial databases

There are numerous geometric objects stored in the spatial databases. An importance function in a spatial database is that users can browse the geometric objects as a map efficiently. Thus the spatial database should display the geometric objects users concern about swiftly onto the display window. This process includes two operations:retrieve data from database and then draw them onto screen. Accordingly, to improve the efficiency, we should try to reduce time of both retrieving object and displaying them. The former can be achieved with the aid of spatial index such as R-tree, the latter require to simplify the objects. Simplification means that objects are shown with sufficient but not with unnecessary detail which depend on the scale of browse. So the major problem is how to retrieve data at different detail level efficiently. This paper introduces the implementation of a multi-scale index in the spatial database SISP (Spatial Information Shared Platform) which is generalized from R-tree. The difference between the generalization and the R-tree lies on two facets: One is that every node and geometric object in the generalization is assigned with a importance value which denote the importance of them, and every vertex in the objects are assigned with a importance value,too. The importance value can be use to decide which data should be retrieve from disk in a query. The other difference is that geometric objects in the generalization are divided into one or more sub-blocks, and vertexes are total ordered by their importance value. With the help of the generalized R-tree, one can easily retrieve data at different detail levels.Some experiments are performed on real-life data to evaluate the performance of solutions that separately use normal spatial index and multi-scale spatial index. The results show that the solution using multi-scale index in SISP is satisfying.     

Jane Eyre——A Feminist In The 19th Century

In the 19th century the society was controlled by men, and women were just appendants of them, they had not any rights and freedom. But Jane was an exception, she showed some characteristics of early feminist. Jane showed her characteristics of feminism in three aspects: rebellion, equality, and independence. These characteristics were helpful to her success, and feminism is the only way out for women of that time.     

Achieving Unusual States of Matter Under High Pressure

正The periodicity of the elements and the non-reactivity of the inner-shell electrons are two related principles of chemistry,rooted in the atomic shell structure.Within compounds,Group I elements,for example,invariably assume the+1 oxidation state,and their chemical properties differ completely from those of the p-block elements.These general rules govern our understanding of chemical structures and reactions.Using first principles calcula-     

Exchange-Correlation and Electronic Excitation Energies from Pairing Matrix Fluctuations

We have developed an adiabatic connection to formulate the ground-state exchange-correlation energy in terms of pairing matrix linear fluctuations.This formulation of the exchange-correlation energy opens a new channel for density functional approximations based on the many-body perturbation theory.We illustrate the potential of such approaches with an approximation based on the particle-particle Random Phase Approximation(pp-RPA).This re-