硫酸水解角蛋白制取L-胱氨酸的研究

研究了硫酸法水解角蛋白提取Ｌ－胱氨酸,讨论了由猪毛提取Ｌ－胱氨酸工艺的主要影响因素。结果表明,Ｌ－胱氨酸的水解率高达１３％～１４％,收率可达６．８％,母液制成氨基酸复合肥,总氨基酸含量大于２０％。     

“中试基地”吴芝清副教授发明的利用毛发生产胱氨酸新技术当年投产当年受益

我校省基因工程技术应用中试基地(简称“中试基地”)的吴芝清副教授,经过长时间的研究,发明了利用毛发生产胱氨酸新技术,经在保定试投产后,收到当年投产当年收回成本的好效益。 胱氨酸是二十种氨基酸的一种,主要用于化妆品工业,少量用于医药。我国目前采用的胱氨酸提取法是沿用六十年代的工艺,具有产品收率低,产品单一,污染严重的缺点。而新方法则把产品收率从4％提高到6％,提高了约50％,同时,生产废液经处理可制成高效饲料添加剂,用于养鸡、养猪,可部分或全部替代进口鱼粉使用,并且解决了环境污染问题。     

应用氨基酸分析仪测定血浆中同型胱氨酸含量的研究

根据日立８３５－５０型氨基酸自动分析仪生理体液分析法，以及同型胱氨酸的生理特性，建立测定同型胱氨酸的１５０ｍｉｎ短程序法。经过精密度和准确度试验，重现性好，变异系数小。当同型胱氨酸浓度为４×１０＾－５ｍｏｌ／Ｌ时，峰位置和峰面积的变异系数（ＣＶ值）分别为０．２０％和１．９８（ｎ＝１０），明显低于规定技术指标（１％和２．５％）。对１、２、４（×１０＾－４ｍｏｌ／Ｌ）浓度的同型胱氨酸加标回收试验，回收     

以动物毛为原料提取系列氨基酸的新工艺

提出了提取氨基酸的新工艺：用动物毛为原料，以ＡＭＥ为萃取剂萃取分离出胱氨酸、脯氨酸、亮氨酸、酪氨酸和混合氨基酸等五种系列产品，克服了传统工艺只能提取胱氨酸一种产品的缺点，而且胱氨酸的收得率从５．５％提高到７．５％，使效益大大提高。     

D-萄葡糖酸-δ-内酯的制备及其测定

由葡萄糖酸钙制备-δ-内酯已有报道,但国内收率仅45-55％。本文研究了温度、浓度、减粘剂对于δ内酯结晶收率、纯度、晶析时间的影响。部分改进了制备方法,将收率提高到65-72％(理论收率为79.5％)。产品纯度达到日本同类产品水平。     

微生物法制备L一半胱氨酸分离提纯的方法

采用微生物法制备L-半胱氨酸,产物浓度低、易氧化和被脱巯基酶进一步分解,L-半胱氨酸的分离提纯难度较大,是制约产品收率提高的控制步骤.目前多采用将L-半胱氨酸氧化为L-胱氨酸,分离后再电解还原的氧化法和离子交换法,离子交换法以其简洁的工艺成为今后的研究方向.     

泡沫分离,带溶剂萃取和沉淀法提取庆大霉素

研究了用文题法从水相中分离砂大霉素的各种操作因素对分离过程的影响。在最适条件下，种方法对庆大霉素配制液的收率分别为７２％，８８％，８７％，无机盐能使沉淀收率提高。将上述３法用于发酵液时，泡沫法和萃取法的收率均有显著降低，而沉淀法依然能达到很高的收率，ψ＝捍沉淀率约为１００％．     

由间二氯苯合成2，4－二氟苯胺

以间二氯苯为原料，经硝化、氟代及还原反应合成２，４－二氟苯胺。探索了各步反应的工艺条件，对提高收率难度较大的氟代反应，研究了使用季铵盐类相转移催化剂时原料配比、反应温度及时间与收率之间的关系，并得到了较好的结果。硝化反应收率达９７％，氟代７０％，还原８９％。与其它方法相比，产品总收率由２２％～５０％提高到６０％以上，从而使文题所示的合成路线成为技术、经济上可行的方法。     

4-正戊基-4''-氰基三联苯的合成研究

以三联苯为原料，经Friedel-Crafts反应（收率80％），还原反应（收率60％），碘代反应（收率55％）、氰化反应（收率60％），制得4－正戊基－4'-氰基三联苯。与以前的合成方法相比，在还原反应温度上做了较大的改变，在最终产物提纯方面进行了优化，减少了合成步骤，操作简单，提纯方便，提高了收率。     

丙二腈的合成研究

由氰乙酸乙酯与氨反应生成氰乙酰胺，再经过消除反应制得丙二腈。对工艺条件进行了改进，使收率得到较大的提高，胺化反应收率达96％，消除反应收率达86.8％，均超过国内文献报道值。     

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.     

Design and analysis of generic LBS application developing platform

Location based services is promising due to its novel working style and contents.A software platform is proposed to provide application programs of typical location based services and support new applications developing efficiently. The analysis shows that this scheme is easy implemented, low cost and adapt to all kinds of mobile nework system.     

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