Nafion化学修饰钨丝圆盘预富集─石墨炉原子吸收法联用间接测定抗菌类药物头孢拉定的研究

本文研究了Ｎａｆｉｏｎ化学修饰钨丝圆盘预富集－石墨炉原子吸收法间接测定头孢拉定的方法，并探讨了测定的机理。在ｐＨ为６．９的Ｃｕ２＋液中，加入的头孢拉定与Ｃｕ２＋进行配合反应，使原来溶液中的Ｃｕ２＋量减少，于是交换到Ｎａｆｉｏｎ膜上的Ｃｕ２＋的量也相应减少，从而测得Ｃｕ２＋的吸光度信号下降。头孢拉定浓度在１．５×１０－６－１．０×１０－５ｍｏｌ／Ｌ范围内，与吸光度下降值呈良好的线性关系，平行测定十次，相对标准偏差为２．０％，最低检出限为１．０×１０－６ｍｏｌ／Ｌ。同时测得Ｃｕ２＋与头孢拉定的配合比为１∶２，条件稳定常数为６．９×１０９。实测药物中头孢拉定的含量，结果令人满意。     

淀粉—KI体系光度法测定微量铜（Ⅱ）的研究

本文利用碘与淀粉的高灵敏显色反应，建立了光度法测定微量铜的新分析方法。该法简单易行，灵敏准确．Ｃｕ２＋离子浓度在１．０×１０－６～６．０×１０－５ｍｏｌ．Ｌ－１区间符合比耳定律，检测限为５×１０－７ｍｏｌ．Ｌ－１。对水样中微量铜的测定．回收率在９８．２％～９９．６％之间变化，ＲＳＤ为２．２％和２．５％。     

荧光分光光度法测定人血清中西诺沙星的浓度

建立了荧光分光光度法测定血清中西诺沙星浓度的方法． 用乙腈沉淀蛋白对血清进行预处理, 在硼酸盐缓冲溶液（ｐＨ＝ ９－０） 中, 血清中西诺沙星线性测定范围为０－１ ～１０－０μｇ／ｍ Ｌ（ｒ ＝０－９９６１） , 人血清中西诺沙星的平均回收率为９７－５ ％ ． 日内变异系数为３－０ ％ （ ｎ ＝ ５） , 日间变异系数为３－４ ％ （ ｎ＝ ６） ． 本法适于西诺沙星血药浓度的测定．     

依诺沙星的电化学研究

依诺沙星在Ｂｒｉｔｔｏｎ－Ｒｏｂｉｎｓｏｎ缓冲液（ｐＨ２．０～１１．０）中产生两个极谱还原峰。两峰强烈地受溶液ｐＨ值的影响，峰Ⅰ（－１．ＩＶ～－１．５Ｖｖｓ．ＳＣＥ）对应于吡啶环的双电子还原，峰Ⅱ（１．５伏～－１．７伏ｖｓ．ＳＣＥ）对应于羰基的还原。实验表明电极过程是受扩散控制的不可逆过程，并测定了ｎ，ａ和Ｄ０的值。当ＰＨ＝２．２时，峰Ⅰ的峰电流与依诺沙星的浓度在４．０×１０－８～６．０×１０－６ｍｏｌ／Ｌ之间有线性关系，检测限为２．５×１０－８ｍｏｌ／Ｌ，可用于依诺沙星的检测。     

电镀液和电镀层中铜和锰的联合测定

当ｐＨ＝１０时,铜和锰都能与ＰＡＲ生成稳定的红色络合物;当ｐＨ＝７时,锰与ＰＡＲ几乎不络合,而铜与ＰＡＲ则可以稳定络合．利用这种差异,可以在ｐＨ＝１０的介质中测定铜和锰的合量,而在ｐＨ＝７的介质中测定铜的量,再由两者之差求得锰的含量．试验表明,ｐＨ＝１０．０时,εＣｕ－ＰＡＲ４９８．５＝４．６６×１０４Ｌ／ｍｏｌ·ｃｍ;εＭｎ－ＰＡＲ４９８．５＝８．００×１０４Ｌ／ｍｏｌ·ｃｍ;ｐＨ＝７．０时,εＣｕ－ＰＡＲ４９８．５＝４．２６×１０４Ｌ／ｍｏｌ·ｃｍ．相对标准偏差小于３％,回收率为９５％～１０１％．其方法适用于电镀液和电镀层中Ｃｕ和Ｍｎ的测定     

脱乙酰基甲壳素选择吸附分光光度法测定微量铜

利用壳聚糖对Ｃｕ２＋的选择性吸附,以壳聚糖制膜,对在ｐＨ１０．０的ＮＨ３－ＮＨ４Ｃｌ缓冲溶液中,Ｃｕ２＋与锌试剂形成的络合物进行选择性吸附,分光光度法测定。在１．０～４．０μｇ·ｍＬ－１Ｃｕ２＋－锌试剂络合物浓度范围内,呈良好的线性关系,相关系数０．９９９２,最低检测限为０．３μｇ·ｍＬ－１,本方法应用于工业电镀液中Ｃｕ２＋含量的测定,结果满意。     

嗜碱细菌NTT33碱性β—甘露聚糖酶的纯化与性质研究

根据了嗜碱芽孢杆菌ＮＴＴ３３产生的碱性β－甘露聚糖酶经纯化后,在ＰＡＧＥ电泳上呈现一条蛋白带,分子量为３．８９×１０＾７,等电点为３．０￣４．０,酶反应最适ｐＨ为９．０￣１０．０,最适作用温度为８０℃,稳定ｐＨ为６．０￣９．０,稳定温度为６０℃以下,金属离子Ｃｕ＾２＋,Ｍｇ＾２＋,Ａｌ＾３＋,Ｃｏ＾２＋对该酶有一定的激活作用,而Ａｇ＾＋,Ｈｇ＾２＋,Ｍｎ＾２＋对该酶有明显抑制作用,经薄层层析鉴定,     

Mn（Ⅱ）—OP—5—Br—PADAP分光光度法研究

研究了在ｐＨ９．４的硼砂介质中，Ｍｎ（Ⅱ）－ＯＰ－５－Ｂｒ－ＰＡＤＡＰ红色络合物形成的适宜条件和络合物的稳定性等．锰含量在（０～１）ｍｇ／Ｌ范围内服从Ｂｅｅｒ定律．其回归方程为：Ａ＝０．０５９９２Ｃ＋３．４×１０－２，（ｒ＝０．９９８６）．摩尔吸光系数ε＝１．０６×１０５．测定６次相对偏差小于３．０％．加标回收率在９６％～９８％．该法用于茶叶中锰的测定，结果令人满意．     

绞股蓝中痕量铅和铜的测定──黄原酯棉分离富集火焰原子吸收光谱法

研究了自制黄原酯棉对ＣＵ（Ⅱ）和Ｐｂ（Ⅱ）的动态吸附条件及模拟量共存元素对吸附的干扰程度，拟定了用火焰原子吸收光谱法测定绞股蓝及其浸泡液中Ｃｕ和Ｐｂ的分析方法，并对方法进行了检验。结果表明：在ｐＨ＝３、黄原酯棉用量为０．２ｇ、流速为３ｍＬ／ｍｉｎ时，浓度不低于０．０２μｇ／ｍＬ的Ｃｕ（Ⅱ）和Ｐｂ（Ⅱ）能被定量吸附；用ＨＮＯ３或１∶１ＨＮＯ３（２ｍＬ）可完全解吸；当有Ｃａ２＋、Ｍｇ２＋、Ｋ”、Ｆｅ３＋（４０ｍｇ）、Ａｌ３＋、Ｃｍ４（１０ｍｇ），Ｍｎ２＋、Ｃｒ－（５ｍｇ）和Ｎａ＋（５００ｍｇ）之一共存时未出现干扰；模拟消化液中共存离子对校正曲线影响很少；校正曲线的相关系数为０．９９７（Ｃｕ）和０．９９６（Ｐｂ）；消化法标准回收率为９６％～１０４％（Ｐｂ）和９７％～１０３％（Ｃｕ），浸出液法标准回收率为９５％～１０２％（Ｐｂ）和９７％～１０１％（Ｃｕ）。     

缓冲液条件对水霉细胞壁细胞Ca^2＋的影响

用原子吸收光谱研究了ｐＨ值、Ｔｒｉｓ－马来酸缓冲液浓度对水霉（Ｓａｐｒｏｌｅｇｎｉａ ｆｅｒａｘ）顶端生长菌丝细胞壁与Ｃａ＾２＋结合的影响,发现在ｐＨ３．５～６．０范围内,细胞壁结合的Ｃａ＾２＋随ｐＨ值升高而增加,ｐＨ〉６．０时,细胞壁结合的Ｃａ＾２＋呈下降趋势。细胞壁结合的Ｃａ＾２＋随Ｔｒｉｓ－马来酸缓冲液浓度升高而增加,Ｔｒｉｓ浓度高于９ｍｍｏｌ／Ｌ时,细胞壁结合的Ｃａ＾２＋则减少。细胞最多可     

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.     

An Analysis of Catherine＇s Character——Wuthering Heights

Wuthering Heights, Emily Bronte＇s only novel, was published in December of 1847 under the pseudonym Ellis Bell. The book did not gain immediate success, but it is now thought one of the finest novels in the English language. Catherine is the key character of this masterpiece, because everybody and everything center on her though she had a short life. We can understand this masterpiece better if we know Catherine well.     

Lower Paleozoic oil relationships within Williston Basin, Canada

The Williston Basin is a significant petroleum province, containing oil production zones that include the Middle Cambrian to Lower Ordovician, Upper Ordovician, Middle Devonian, Upper Devonian and Mississippian and within the Jurassic and Cretaceous. The oils of the Williston Basin exhibit a wide range of geochemical characteristics defined as "oil families", although the geochemical signature of the Cambrian Deadwood Formation and Lower Ordovician Winnipeg reservoired oils does not match any "oil family". Despite their close stratigraphic proximity, it is evident that the oils of the Lower Palaeozoic within the Williston Basin are distinct. This suggests the presence of a new "oil family" within the Williston Basin. Diagnostic geochemical signatures occur in the gasoline range chromatograms, within saturate fraction gas chromatograms and biomarker fingerprints. However, some of the established criteria and cross-plots that are currently used to segregate oils into distinct genetic families within the basin do not always meet with success, particularly when applied to the Lower Palaeozoic oils of the Deadwood and Winnipeg Formation.     

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.     

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-     

Density Functional Theory for the Response of Periodic Systems to Electric Fields Based on the Vector Potential Approach

正The electronic and nuclear(structural/vibrational)response of 1D-3D nanoscale systems to electric fields gives rise to a host of optical,mechanical,spectral,etc.properties that are of high theoretical and applied interest.Due to the computational difficulty of treating such large systems it is convenient to model them as infinite and periodic(at least,in first approximation).The fundamental theoretical/computational problem in doing so is that     

On the Thermodynamic Limit for Responses to Static Electromagnetic Fields

For molecular systems,the quantum-mechanical treatment of their responses to static electromagnetic fields usually employs a scalar-potential treatment of the electric field and a vector-potential treatment of the magnetic field.Although the potential for each field separately is associated with the choice of an(unphysical)origin,the precise choice of the origin for the electrostatic field has little consequences for the results.This is different for the