阴离子交换树脂分离卡那霉素A、B组分的研究

根据吸附色层分离原理 ,利用阴离子交换树脂分离卡那霉素A、B组分 ,研究了不同树脂类型、不同树脂粒径及不同洗脱条件 (洗脱液NH4 OH浓度、洗脱流速、上柱量 )对分离效果的影响 .以含卡那霉素B 2 0 %的结晶母液为原料 ,通过试验确定了分离提取高纯度的卡那霉素B组分的最佳工艺条件为 :洗脱剂NH4 OH体积分数为 0 .6 % ,洗脱流速 0 .5mL/min ,树脂粒径为 0 .2 0mm ,上柱量为 1.0 5 μg/mL(树脂 ) .     

强酸型离子交换纤维PVF-g-SO_3H对碱性氨基酸的分离研究

研究强酸型阳离子交换纤维PVF g SO3 H对碱性氨基酸L 组氨酸和L 赖氨酸的吸附分离性能 ,并与 73 2号树脂进行比较 .结果表明PVF g SO3 H纤维不仅对单组份赖氨酸或组氨酸的吸附率比 73 2号树脂高约 1 5%～ 3 9% ,而且其洗脱率高约 1 2 5%～ 1 3 4 % ,同时对混合氨基酸的洗脱峰既强而且分辨率高 .再生后纤维和树脂的总提取率都有微小的下降 ,但纤维的再生提取率仍高于 73 2号树脂 1 0 %以上 .实验的最佳洗脱条件为 :洗脱液柠檬酸 柠檬酸钠的pH值为 4 6,填充柱长径比为 2 0 ,洗脱速率为 1mL/min .     

大孔树脂纯化准噶尔山楂色素的研究

研究大孔吸附树脂纯化准噶尔山楂色素的条件,通过方差分析确定纯化条件。结果表明:X-5树脂吸附和解吸附效果较好,最佳吸附条件是树脂柱径高比1:15、流速3 mL/min、pH3.0、色素液浓度1 g/L;以95%乙醇做洗脱剂、pH2.0、流速5mL/min、3倍于柱床体积的洗脱剂条件下解吸附效果最佳。制取的色素产品外观呈紫红色,色价为28.43。     

大孔吸附树脂分离核桃青皮萘醌类成分及其抑菌性研究

以核桃青皮萘醌类成分为分离对象,选用大孔吸附树脂,应用响应面法优化分离参数;考察提取物对大肠杆菌和金黄色葡萄球菌的抑制效果。响应面试验结果显示,在吸附液浓度为0.1 mg/mL、吸附液pH值为2、吸附流速为0.5 mL/min的最优条件下进行树脂吸附,吸附率可达81.89%,各因素对吸附率影响顺序为:吸附液浓度吸附液pH吸附流速;在丙酮洗脱液浓度为95%、洗脱液pH值为3.5、洗脱流速为0.5 mL/min的最优条件下进行树脂洗脱,洗脱率可达70.63%,各因素对洗脱率影响顺序为:洗脱液浓度洗脱流速洗脱液pH;提取物对大肠杆菌和金黄色葡萄球菌均具有明显的抑制作用,且萘醌树脂分离提取物的抑菌性高于粗提物。     

鸡血藤中总黄酮的大孔树脂纯化工艺

为了探讨大孔吸附树脂纯化鸡血藤中总黄酮的最佳工艺,通过对6种型号大孔树脂的静态实验,筛选出最佳树脂;考察最佳树脂对鸡血藤总黄酮的吸附及洗脱性能,优化工艺参数.结果表明:HZ820为最佳树脂,其纯化总黄酮的优化工艺条件为上样液质量浓度3.31mg/mL,吸附流速4BV/h(1BV为20mL),上样液体积500mL,树脂吸附量达79.31mg/g;以60%乙醇为洗脱剂,洗脱流速3BV/h,洗脱用量5BV,解吸率达92.72%,减压浓缩得鸡血藤总黄酮浸膏,纯度为79.49%.     

头花蓼总黄酮纯化工艺的研究

利用静态-动态吸附和解析的方法,从6种树脂中选出了适合纯化头花蓼总黄酮的树脂,同时探讨了其纯化头花蓼总黄酮的条件。结果表明:D101树脂纯化头花蓼总黄酮的效果最好,其纯化条件为:进样液黄酮浓度0. 8 mg/mL并且pH 5,1. 0 mL/min的进样速度,洗脱剂为3. 5倍柱体积70%的乙醇溶液,洗脱流速为2. 0 mL/min。纯化后黄酮的纯度可达81. 93%。     

响应面法优选泽兰多糖的大孔吸附树脂纯化工艺

目的:考察8种大孔吸附树脂D3520、H103、HPD-100、HPD-700、AB-8、HPD722、S-8、HPD-600对泽兰多糖的纯化效果,以Box-Behnken法优化最佳大孔吸附树脂的最优纯化工艺.方法:以多糖保留率、脱色率、脱蛋白率的加权综合评分为指标,考察大孔树脂、洗脱流速、上样浓度、洗脱剂用量对纯化结果的影响,通过Box-Behnken设计建立响应面模型来优选大孔树脂泽兰多糖的工艺参数.结果:优选的泽兰多糖的大孔树脂纯化工艺为:取HPD-100大孔吸附树脂,泽兰多糖的上样质量浓度为0.03 g/mL,洗脱流速为1.1 mL/min,洗脱体积为40 mL,以此优选工艺纯化后,多糖保留率69.21%,脱色率60.24%,蛋白脱除率75.67%.结论:泽兰多糖的纯化工艺稳定可靠,HPD-100大孔吸附树脂纯化工艺效果良好,适合工业化生产.     

大孔强酸性阳离子交换树脂脱除柴油中碱性含氮化合物方法的研究

研究了用大孔强酸性阳离子交换树脂萃取柴油中碱性含氮化合物的方法，包括树脂的筛选，树脂柱层的高径比(H／D)、流速对碱氮脱除率的影响；洗脱剂选择，洗脱剂配比、流速对洗脱效率的影响．确定了适宜的柱上萃取、洗脱及树脂再生的条件．实验表明，本法具有树脂吸附容量大，柴油中碱氮脱除率和回收率高(96％以上)，树脂再生效果好，操作简便等特点．     

大孔树脂对黄瑞木果实红色素吸附性能的研究

用动态法将树脂预处理后,用来吸附分离黄瑞木果实红色素,结果表明:X-5树脂对黄瑞木红色素的吸附效果最好.温度对树脂的吸附效果影响不显著,在室温下,吸附能力较好.被吸附的黄瑞木果实红色素用φ(乙醇)为95%洗脱为宜,洗脱适宜温度为室温(20～23 ℃).通过正交实验得出树脂吸附的最佳组合条件:色素液流速为1 mL/min,质量浓度为0.7 g/mL,温度为20 ℃.     

强酸型离子交换纤维PVF—g—SO3H对碱性氨基酸的分离研究

研究强酸型阳离子交换纤维PVF－g-SO3H对碱性氨基酸L－组氨酸和L－赖氨酸的吸附分离性能,并与732号树脂进行比较。结果表明PVF－g-SO3H纤维不仅对单组份赖氨酸或组氨酸的吸附率比732号树脂高约1．5％－3．9％,而且其洗脱率高约12．5％－13．4％,同时对混合氨基酸的洗脱峰既强而且分辨率高。再生后纤维和树脂的总提取率都有微小的下降,但纤维的再生提取率仍高于732号树脂10％以上。实验的最佳洗脱条件为：洗脱液柠檬酸－柠檬酸钠的pH值为4．6,填充柱长径比为20,洗脱速率为1mL/min。     

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.     

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     

Call for Papers

<正>"The Journal of Shanghai Normal University:Mathematics"is published by Shanghai Normal University as regular issues of The Journal of Shanghai Normal University each year from 2014 in English.The editors-in-chief of the issues are professors Yuhao Cong and Maoan Han.The Journal of Shanghai Normal University was started in 1958 with     

Journal of Donghua University ( English Edition) Contents of Volume 31

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