溶剂法分离制备大豆肌醇磷脂

利用乙醇为溶剂对大豆磷脂中肌醇磷脂进行分离。建立了乙醇一正己烷体系分离肌醇磷脂的分离度的概念。研究了可以用不同浓度的乙醇对大豆磷脂中的肌醇磷脂进行分离。得出当乙醇浓度为55％时,乙醇一正己烷体系有一个较佳的分离度。     

双溶剂法分离大豆磷脂的优化条件

以正己烷-乙腈双溶剂萃取体系对大豆混合磷脂进行分离,制备高磷脂酰胆碱含量的大豆磷脂。对萃取条件进行优化。考察了萃取温度、磷脂溶剂质量比、正己烷乙腈体积比等条件对萃取结果的影响。在萃取温度为0℃,磷脂/正己烷（g/mL）为1：150,正己烷/乙腈（V/V）为1：3.0条件下,可以制备磷脂酰胆碱含量为60.48%的大豆磷脂。     

蛋黄卵磷脂的提纯工艺研究

目的 提取蛋黄卵磷脂，研究提取时间、温度、乙醇浓度及乙醇用量等对卵磷脂提取率的影响。方法 以蛋黄为原料，乙醇-乙醚二元混合溶液为萃取剂，提取卵磷脂。结果 提取时间、温度、萃取剂用量及浓度对卵磷脂提取率均有影响。结论 通过正交实验，确定了提取卵磷脂的最佳工艺条件：提取温度30℃；提取时间60min；乙醇浓度92％；乙醇加入量12mL／g。     

吉林大豆中卵磷脂的成分提取与分析

对大豆中卵磷脂的提取方法做了系统的研究。采用混合溶剂（V正己烷：V乙醇＝6：4）作为大豆中油提取溶剂的方法,出油率可达17．6％－20．8％,与文献上报道的16．8％有明显提高,大豆中的卵磷脂得到有效的分离提纯。详细研究了薄层色谱法中不同极性的展开溶剂的影响,采用V氯仿：V甲醇：V水＝65：22．5：4（pH=4.0)做展开溶剂,经显色后,对薄层色谱板做光密度扫描。结果表明,可对大豆中的磷脂酰胆碱（PC）和磷脂酰乙醇铵（PE）进行有效的分离。该方法用于11种吉林大豆中卵磷脂的成分分析,取得了满意的结果。     

大豆改性磷脂

１前言磷脂既是一种天然的表面活性剂,又是生物体中不可缺少的营养与生理活性物质。我们研制的大豆改性磷脂,旨在为功能食品提供一种新基料。２原料含有磷脂的原料有玉米、棉子、花生、向日葵、蛋黄、大豆,其中含量最丰富的为大豆,约０．５%,蛋黄中的磷脂含量也很高,而大豆磷脂中的脂肪酸含量比蛋黄磷脂高３倍左右,特别是我们用于试制大豆磷脂的原料———浓缩大豆磷脂,是来自于大豆毛油水化脱胶的副产物———大豆油脚,原料来源广,价格低廉,而且对于大豆的综合利用,减少环境污染都有积极的意义。本试验所用浓缩大豆磷脂理化指标为:丙酮不溶…     

大豆中异黄酮提取条件及其在提取液中的存在形式

以大豆豆粕为原料，以总异黄酮为目标产物。采用正交试验设计探讨了用乙醇—水体系作溶剂提取大豆异黄酮的最佳条件，即体积分数为70％的乙醇，m乙醇：V水=0．1g／ml。50℃下提取3次，每次回流时间1．0h。采用酸水解法和等电点沉淀法研究了异黄酮在提取液中的存在形式。即水不溶性异黄酮占8.0%，水溶性异黄酮占92．0％．其中与糖结合的占61.3％，与蛋白质结合的占30．7％。为进一步分离异黄酮提供了试验基础。采用HPLC法测定异黄酮的量。     

脱脂豆粕酸法水解条件的研究

本文以豆粕为原料，进行了酸法水解制备氨基酸的研究，试验了酸浓度、水解时间和温度对α-氨基氮含量的影响，得到了较佳的水解工艺条件。当水解温度90℃，酸浓度为9％，水解时间24-30小时，α-氨基氮含量可达到1．22g/100ml以上。     

大豆卵磷脂的提纯及表征

探讨了以市售大豆油脚为原料，用全溶剂法精制出符合药用(口服和注射)规格的大豆卵磷脂的工艺条件并建立了相应的数学模型．其主要性能指标为：N％=1．70，P％=4．O％，酸价l0．48，碘价95．35．经高效液相色谱分析，卵磷脂含量达78．66％．     

猪脑组织中磷脂的综合提取研究

介绍了利用哺乳动物猪脑组织提取神经醇磷酸，卵磷脂和脑磷脂的工艺流程，并对某些关键环节进行了分析讨论，不仅为研究磷脂的生物学效应提供了原料，也为猪脑组织的综合利用开辟了一条可行的途径。     

磷脂产品开发

磷脂是构成人体细胞的基本成份，具有特殊的生理功能，研究表明，磷脂中的卵磷脂具有健脑、提高记忆力、加速血液胆固醇的转化、消除血管壁上的沉着，净化血管、改善血液循环、防治动脉粥样硬化等作用，目前国内正注意研究开发磷脂，特别是卵磷脂的产品及其应用，现对其提纯及新产品开发方面作一简要介绍，也许会对一些厂家进行保健食品的开发有所帮助。l磷脂饮料配方磷脂0．17％－0．8％，Vc0．02％－0．03％，天然果汁历％－20％，柠檬酸0．08％－0．16％，其余为矿泉水。制法将各料准确称好；将粉状精制磷脂加入适量的矿泉水中乳化，加…     

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