顶空气相色谱法测定克拉霉素中的丙酮溶剂残留

建立了克拉霉素中丙酮溶剂残留量的测定方法.采用顶空气相色谱法,氢火焰离子化检测器(FID),以二甲基甲酰胺(DMF)为溶剂,HP-FFAP弹性石英毛细管柱为色谱柱(30 m×0.25mm,0.25μm),氮气为载气,分流比为1:60,进样口温度为200℃,检测器温度250℃,柱温采用程序升温.丙酮的质量浓度在0.002～4 g·L-1的范围内呈良好的线性关系(r=0.999 5),回收率为99.2%(RSD=1.9%)检出限小于2.0 mg·L-1.     

异体骨中有机溶剂残留量的分析

采用HP－5色谱柱(30 m ×∮320 μm × 0.25 μm),以丙酮和二氯乙烷为内标物,建立了气相色谱法测定异体骨中有机溶剂(甲醇和氯仿)残留量的分析方法.甲醇和氯仿的线性范围分别为1.2～6.1 mg/mL和13～65 μg/mL,检出限分别为0.012 mg/mL和1.3 μg/mL,实际样品的加标回收率分别为91.6%～101.4%和99.9%～123.8%,满足异体骨样分析的要求.     

进水容积负荷对胞外聚合物的影响

为了提高污水处理的效率,利用序批式活性污泥工艺考察进水容积负荷对胞外聚合物(EPS)的影响.采用Jasco FP-6500三维荧光光度计对EPS进行了荧光分析.结果表明,在进水容积负荷为8.63kg COD/(m3·d)时,EPS质量浓度为75～80mg/L,通过三维荧光光谱分析得到两条独立清晰的类蛋白荧光吸收峰.当进水容积负荷为18.5kg COD/(m3 ·d)时,EPS质量浓度为(89.52+0.46)mg/L,蛋白质质量浓度为26.45～28.9mg/L,多糖质量浓度为(9.38±0.35)mg/L,荧光峰强度显著增加.高容积负荷导致EPS质量浓度增加,组分未发生变化.当进水容积负荷为3.73kg COD/(m3·d)时,EPS质量浓度为(69.8±1)mg/L,蛋白质质量浓度为22.02～29.05mg/L,多糖质量浓度为(5.34±0.6)mg/L,荧光峰强度减弱.低进水容积负荷导致EPS质量浓度较低.     

反相高效液相色谱法测定发酵液中他克莫司含量

建立了发酵液中他克莫司的RP-HPLC测定方法.采用Kromasil C8 (250 mm×4.6 mm, 5 μm) 色谱柱,流动相为V(异丙醇)∶V(水)=35∶65,柱温50 ℃,流速1.0 mL/min,检测波长220 nm,对影响分离和检测的色谱柱、流动相、柱温、检测波长等进行了筛选.结果表明,他克莫司标准品质量浓度在10～100 mg/L范围内线性关系良好,线性方程为y=0.194 9ρ -0.055 3 (r=0.999 6),发酵液试样中他克莫司的平均回收率为99.8 % (n=9),相对标准偏差为0.58 %.     

甲苯降解菌降解特性及代谢途径初步研究

从污泥中分离得到1株能以甲苯为唯一碳源和能源生长的细菌菌株,经过生理生化实验初步鉴定为假单胞菌属.温度在20～40℃之间、pH7、甲苯浓度在316 mg/L以下,菌株降解甲苯的效率保持80%～100%之间,甲苯浓度大于316 mg/L,出现抑制现象.甲苯降解途径是通过甲苯双加氧酶形成顺甲苯二氢二醇,再经邻苯二酚2,3双加氧酶开环降解.     

麦冬皂苷体外溶血作用研究

以不同纯度麦冬皂苷为实验材料,采用紫外分光光度法测定各类样品对兔血红细胞的溶血率,绘制溶血率—质量浓度曲线,并比较不同纯度下相同质量浓度的麦冬皂苷的溶血作用.实验数据显示:当皂苷纯度为4%,质量浓度为0.06 mg/m L时,未出现溶血,质量浓度为0.12 mg/m L时,溶血率上升至13%;当皂苷纯度为17%,质量浓度为0.06 mg/m L时,未出现溶血,质量浓度为0.12 mg/m L时,溶血率上升至15%;当皂苷纯度为73%,质量浓度为0.03 mg/m L时,未发生溶血,质量浓度为0.06 mg/m L时,溶血率上升至12.5%.结果表明,麦冬皂苷具有体外溶血作用,其溶血率随皂苷浓度升高而增大;而在相同质量浓度时,其溶血率随纯度的增加而升高.     

麻栎树皮多酚含量的测定及抗氧化活性的研究

采用分光光度法、DPPH法和连苯三酚红(PR)法对麻栎树皮提取物进行多酚化合物含量及抗氧化活性测定,讨论了用不同溶剂提取对多酚含量的影响.结果表明采用70%乙醇进行提取,提取物中多酚含量最高,为(6 589.91±43.32)mg/100 g.抗氧化活性测试中,麻栎树皮的不同溶剂提取物对DPPH自由基和羟自由基都表现出较高的清除率,其中麻栎树皮70%丙酮提取物的活性最好,在0.18 mg/m L质量浓度下,对DPPH自由基清除率为70%,在0.38 mg/m L质量浓度下,对羟自由基氧化率为75%.     

固相萃取-高效液相色谱法测定枸杞子中吡虫啉残留量

建立固相萃取-高效液相色谱法测定枸杞子中吡虫啉残留量.样品用乙腈提取,中性氧化铝和活性炭固相萃取柱净化,分析时采用Inertsil(R) ODS-3(25cm×4.6 mm,5μm)色谱柱分离,以乙腈-水为流动相梯度洗脱,流速1.0 mL/min,检测波长为270 nm,柱温35 ℃.试验结果表明,在0.02～5.0 mg/L范围内,吡虫啉峰面积与浓度呈良好的线性关系(r=0.9999),枸杞子样品中吡虫啉能得到良好的分离,回收率及重复性良好.     

反相高效液相色谱法测定烟叶中茄尼醇的含量

采用反相高效液相色谱法研究了测定烟叶提取物中茄尼醇含量的方法.条件为:Hypersil ODS柱,流动相为甲醇∶乙醇=75∶25(v/v),流速1.0 mL/m in,紫外检测波长211 nm,柱温30℃.茄尼醇的质量浓度为2.16~34.56 mg/L时,峰面积与质量浓度具有良好的线性关系,相关系数为0.99998.方法的检出限(S/N≥3)为0.09 mg/L,相对标准偏差(RSD)为0.42%(n=6),平均回收率为99.2%.该方法快速、简便、准确.     

顶空气相色谱法测定尿中丙酮

探讨生物尿样中丙酮的检测方法。本文采用顶空气相色谱法对生物尿样中丙酮进行测定,方法简便易行,准确度高,易于基层推广应用。采用FFAP：101酸洗白色担体=10：100色谱柱,氢焰离子化检测器,回收率为95.8%～103.4%,最低检测浓度为2.4×10-4mg/L。     

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     

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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Brief Introduction to “Journal of Jilin University( Science Edition) ”

<正>"Journal of Jilin University(Science Edition)"is a comprehensive academic journal in the fields of science sponsored by Jilin University and administrated by the Ministry of Education of the Peoples Republic of China.The journal started publication in 1955.The original name at starting publication was"Journal of Natural Science of Northeast People University",which was changed into"Acta Scientiarum Naturalium Universitatis Jilinensis"in 1958 owing to the name change of the university.The present journal name has