丽春红S共振瑞利散射法测定硫酸小诺霉素

在弱酸性条件下,硫酸小诺霉素和丽春红S各自的共振瑞利散射十分微弱,两者相互作用后形成缔合物,导致体系的共振瑞利散射急剧增强,在597 nm产生最大散射峰.研究了硫酸小诺霉素与丽春红S体系的共振瑞利散射光谱和吸收光谱特征、反应的适宜条件和共存物质的影响.实验结果表明,硫酸小诺霉素的浓度在O～7.2μg/mL范围内与散射强度(△IRRS)呈良好的线性关系,其回归方程为△I=2.038 9.766c,相关系数0.999 2,检出限为2.66 ng/mL.本法简便、准确、灵敏、选择性和重现性好,已用于硫酸小诺霉素注射液和动物血清中硫酸小诺霉素的测定,结果满意.     

化学发光法测定食盐中的碘酸钾

食盐中的碘酸钾与碘化钾反应生成Ｉ２，再由Ｉ２氧化鲁米诺而产生化学发光，其发光强度与碘酸钾的含量成正比，从而建立了化学发光法测定食盐中碘酸钾的分析方法．本法测定碘酸钾的线性范围为４．０×１０－２～１．０ｍｇ／Ｌ，六次测定相对标准偏差小于５％，回收率为９７％～１０６％．     

基于鲁米诺的流动注射化学发光法测定硫酸链霉素

建立了一种简易、快速测定硫酸链霉素的流动注射化学发光法.本法基于在强碱性介质中,硫酸链霉素能增强铁氰化钾氧化鲁米诺产生化学发光,加入亚铁氰化钾能大大降低这一体系的背景发光强度.在优化的实验条件下该法测定硫酸链霉素的线性范围为5～1000μg/mL,检出限(3σ)为0 6μg/mL.对100μg/mL的硫酸链霉素进行11次平行测定,其RSD为2 2%.将本法用于硫酸链霉素制剂及合成样品的分析,结果令人满意.     

流动注射化学发光测定盐酸利多卡因

酸性介质中盐酸利多卡因被质子化后与AuCl4^-形成离子缔合物．当该缔合物进入鲁米诺的逆胶束“水池”中时，离解出来的AuCl4^-与鲁米诺产生化学发光．据此建立了测定盐酸利多卡因的新方法．在优化的实验条件下。测定盐酸利多卡因的线性范围为0．5～30μg／mL，检出限(3d)为81ng／mL，对浓度为1μg／mL的盐酸利多卡因进行11次平行测定．其相对标准偏差为2．64％．将本法用于制剂中盐酸利多卡因的测定。结果令人满意．     

流动注射化学发光法快速测定染料木素

基于染料木素对高锰酸钾氧化鲁米诺产生的化学发光的增强作用建立了一种测定染料木素的新方法．在优化的实验条件下，测定染料木素的线性范围为：4．0×10^-2～4．0μg／mL，检出限（3d）为8．0×10^-3g／mL，对浓度为0．50μg／mL的染料木素进行11次平行测定，其相对标准偏差（RSD）为1．2％．将本法用于槐角药丸中染料木素含量的测定，结果令人满意．     

假药大案侦破记

假药大案惊动了国家领导人1992年7月24日上午,湖北省黄州市回龙镇乌江村两岁的女孩王畅生病了。妈妈将她抱到乌江卫生所,医生易兰波为她注射了无锡第四制药厂生产,批号920108的"硫酸小诺霉素注射液"。5分钟后,小王畅突然呼吸急促,医生未及抢救她就在妈妈的怀里断了气。这个花朵般的独生女突然被死神夺去,妈妈哭天嚎地,悲痛欲绝……经黄州市卫生部门药检,这种"硫酸小诺霉素注射液",实际是"氯化唬珀胆碱"。自1992年7月30日至10月4日,国家卫生部先后接到山东、河南、四川等省卫生厅的电报,报告婴儿因使用上海海普制药厂和无锡第四制药厂生产的硫酸小诺霉素注射液和硫酸卡那霉素注射液导致死亡的消息。而上述药品药检结果,均为氯化琉珀胆碱注射液。     

ICP-AES间接测定硫酸阿托品

研究了采用等离子发射光谱法间接测定硫酸阿托品的方法。在pH为5．0的溶液中，当四苯硼钠过量时可完全沉淀硫酸阿托品，在滤液中加入过量的氯化钾沉淀剩余的四苯硼钠，再测定过量的钾可以计算得到硫酸阿托品的含量。方法简单快速，回收率在96％～102％之间，相对标准偏差为1．2％。     

硫酸钡比浊法对鹿茸多糖中硫酸基含量的测定

硫酸基含量对多糖的生物活性起着至关重要的作用。运用硫酸钡比浊法测定梅花鹿鹿茸多糖（Pilosc Antler Polysaccarides，PAPS）的硫酸基含量。采用可见分光光度法，最大吸收波长为360nm，测得硫酸基含量5．8％。稳定性试验表明，硫酸基在60～120μg线性关系良好（r=0．99719），同一样品在10～40min内检测值比较稳定。回收率为97．25％。该方法比较准确、快速、灵敏度较高，适用于动物多糖硫酸基含量的测定。     

硫酸颜色反应用于乙酰螺旋霉素的荧光法测定

提出了硫酸颜色反应用于乙酰螺旋霉素的荧光测定新方法．乙酰螺旋霉素本身为弱荧光物质,与浓硫酸反应后生成强荧光物质,所得产物有较强的荧光（λｅｘ＝２８０ｎｍ,λｅｍ＝４９０ｎｍ）,其强度与乙酰螺旋霉素的浓度在５０μｇ／Ｌ～４０ｍｇ／Ｌ的范围内线性关系良好．方法的检测限为３６μｇ／Ｌ．本法还可直接用于尿液和片剂中乙酰螺旋霉素的定量分析,回收率分别为８１．７％～８２．６％和９２．３％～１１０．８％．     

分光光度法测定吉他霉素的含量

目的：探讨应用分光光度法代替微生物法测定吉他霉素含量。方法：采用乙醇为溶剂，加入PH7．8磷酸盐缓冲液稀释，在231nm波长处测定吸收度，绘制标准曲线。结果：该测定法平均回收率为99．15％，RSD为0．420％（n=5），线性范围为4．9824－24．7896u/ml，r=0.9999。结论：本法操作简便、快速、灵敏，便于生产过程的控制。     

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