河水中酰胺醇类抗生素的分析测定

建立了河水中3种酰胺醇类抗生素氯霉素、甲砜霉素和氟甲砜霉素的分析方法.利用HLB固相萃取柱进行水样的富集、净化,超高压液相色谱-串联质谱仪多反应监测离子模式进行定性、定量分析.工作曲线的线性范围为1～1 000 μg/L,3种目标物的方法检测限为1 ng/L(S/N=10,1 000倍浓缩);加标浓度分别为5.0、20.0和100 ng/L时的回收率为52.1%～77.5%,相对标准偏差1.9%～8.5%(n＝4).方法初步应用于福建省九龙江下游河水样品的分析.     

Growth inhibition effect of phenicol antibiotics on Chlorella pyenoidosa

采用光照培养箱室内培养法,将蛋白核小球藻暴露于不同质量浓度苯丙醇类抗生素的水体中4d,研究3种苯丙醇类抗生素氟苯尼考(FF)、甲砜霉素(TAP)和氯霉素(CAP)对蛋白核小球藻种群生长的影响.研究结果表明:氟苯尼考、甲砜霉素和氯霉素对蛋白核小球藻的生长有一定的抑制作用,该效应表现出一定的质量浓度和时间依赖性,48 h的EC5o分别为10.42 mg/L、84.35mg/L和28.66 mg/L;96h的EC50依次为9.40、64.92和25.26mg/L.氟苯尼考、甲砜霉素和氯霉素对蛋白核小球藻的安全浓度分别为0.94、6.49和2.53 mg/L结果还表明,这3种苯丙醇类抗生素,以氟苯尼考对蛋白核小球藻生长的抑制作用最大,氯霉素次之,甲砜霉素最小.     

水产品中3种氯霉素类药物残留的超高效液相色谱-串联质谱测定法研究

采用超高效液相色谱-电喷雾串联质谱仪(UPLC-ESI-MS/MS)同时测定水产品中的氯霉素、甲砜霉素和氟苯尼考3种氯霉素类药物残留量.该方法经乙酸乙酯提取样品,正己烷脱脂净化,超高效液相色谱C18柱分离,电喷雾负离子多反应模式(MRM)检测.氯霉素定量检出限为0.10 μg/kg,线性范围为0.10～50.0 μg/L,在阴性样品0.10～2.00 μg/kg的氯霉素添加浓度下,平均回收率为84.7％～104.9％;甲砜霉素和氟苯尼考定量检出限均为0.50 μg/kg,线性范围为0.50～50.0 μg/L,在阴性样品0.50～10.0 μg/kg的添加浓度下,甲砜霉素平均回收率为88.2％～104.1％,氟苯尼考平均回收率为91.9％～104.1％.且所有测定结果的批内相对标准偏差(RSD)均小于15％.结果表明该方法简便快捷,准确度和精密度高,适用于水产品中氯霉素类药物残留快速检测的要求.     

LC-MS/MS法测定人血浆中克拉霉素的质量浓度

建立高效液相色谱-质谱联用法（LC-MS/MS）测定人血浆中克拉霉素的浓度.选用Shim-park VP-ODS色谱柱,以乙腈、φ=0.1%氨水、φ=0.4%甲酸乙腈溶液为流动相,采用梯度洗脱进行分离,样本经乙腈沉淀后进样,选用3200QTRAP型质谱仪的多重反应监测（MRM）扫描方式进行检测.克拉霉素质量浓度线性范围为5～1 000ng.mL-1,定量下限为5ng.mL-1,检测限为0.05ng.mL-1.准确度与精密度结果显示方法日间、日内变异均小于15%,相对偏差为-3.43%～2.97%,低、中、高3个质量浓度提取回收率为91.73%～107.73%,稳定性好.本研究所建立的方法快速、灵敏、专属性强、重现性好,可用于人体血浆中克拉霉素质量浓度的测定和药代动力学研究.     

固相萃取-超高压液相色谱-串联质谱法分析海水中9种磺胺类抗生素

应用固相萃取及液相色谱-质谱联用技术,建立了海水中9种磺胺类抗生素的分析方法.海水样品经HLB固相萃取柱富集、净化后用甲醇洗脱浓缩定容,利用超高压液相色谱-串联质谱仪多反应监测（MRM）离子模式对目标物进行定性、定量分析.9种磺胺测定的线性范围为0.2～1000μg/L,方法检测限在0.2～0.4 ng/L之间（S/N=10,1 000倍浓缩）.以海水为基底,磺胺甲基嘧啶为替代物,加标浓度分别为5.0 ng/L和20.0 ng/L时,9种磺胺的回收率在86.4%～150.4%之间,相对标准偏差0.5%～8.4%（n=4）,方法成功应用于厦门近岸海域海水样品中抗生素残留的分析.     

TTC比色法测定甲砜霉素/氟甲砜霉素-羟丙基-β-环糊精包合物的体外抗菌活性

目的：考察甲砜霉素、氟甲砜霉素被包合后,其体外抗菌活性的变化情况。方法：分别配制一系列不同浓度的甲砜霉素、氟甲砜霉素原料药溶液和相应浓度的包合物溶液,在以O78大肠杆菌为试验菌株的情况下,氯化三苯基四氮唑（TTC）作为细菌是否存活的显色剂,测定其最小抑菌浓度。结果：在体外试验条件,甲砜霉素、氟甲砜霉素包合物的最小抑菌浓度与其原料药是相同,体外抗菌活性未受影响。结论：该方法简便、快速、准确,可用于甲砜霉素/氟甲砜霉素-羟丙基-β-环糊精包合物抗菌活性的测定。     

反相高效液相色谱法测定氟甲砜霉素

提出了测定已被研制的兽药氟甲砜霉素的反相高效液相色谱分析法。该方法操作简便 ,快速 ;测定结果准确 ,其相对偏差为 0 .32 % ,回收率为 99.97%～ 10 2 .1%。此法可以用作氟甲砜霉素产品生产和质量控制的分析方法     

常用抗菌渔药对致病性鳗弧菌作用效果比较

采用二倍稀释法测定7种常用抗菌渔药的最低抑菌浓度（MIC）,以5倍MIC下抑菌圈直径为参数,比较7种常用抗菌渔药单独用药与联合用药对鳗弧菌的抑杀菌效果．甲砜霉素的MIC最小为0．8μg／mL,庆大霉素最大为6．4μg／mL;在5倍MIC下,7种常用抗菌渔药抑菌圈分别为：庆大霉素1．90cm,氟哌酸1．50cm,链霉素1．43cm,土霉素1．43cm,烟酸诺氟沙星1．43cm,氟甲砜霉素1．40cm,甲砜霉素1．33cm．鳗弧菌对庆大霉素和氟哌酸高度敏感;对链霉素、土霉素、烟酸诺氟沙星、氟甲砜霉素和甲砜霉素中度敏感;烟酸诺氟沙星与甲砜霉素的联合效果最好。     

双泵双柱UP-LC/MSMS法对烟熏肉制品中氯霉素、氟苯尼考和甲砜霉素的稳定性分析

建立了双泵双柱高效液相色谱/质谱法对烟熏肉制品中氯霉素、氟苯尼考和甲砜霉的快速分析方法。试样经氨化乙酸乙酯提取,浓缩后用(1+9)乙腈+水定容,正己烷去脂,得到样品待测液。试验结果：氯霉素类在0.5～10.0 ng/mL浓度范围内具有良好线性关系,相关系数均大于0.995;不同浓度加标回收率均在80.2%～109.2%之间,相对偏差小于14.6%:方法检出限为氯霉素0.1μg/kg,甲砜霉素和氟苯尼考0.5μg/kg。在30天周期性质稳定。此方法重现性好,灵敏度高,分析高效、快捷,能满足批量样品快速分析。     

条子河中多环芳烃和有机氯农药的时空分布及来源解析

以辽河支流条子河中的多环芳烃（PAHs）和有机氯农药（OCPs）为目标物, 分别于春汛期、 丰水期、 平水期和枯水期采集水样及表层沉积物样品, 分析样品中PAHs和OCPs的赋存状态及污染物在该区域的分布和来源. 结果表明： 条子河水中总PAHs的质量浓度为658.1~3 096.6 ng/L, 均值（算术平均值, 下同）为
1 522.1 ng/L; 沉积物中总PAHs的质量比为775.7~2 835.4 ng/g, 均值为1 374.0 ng/g; 条子河水中总α,β,γ HCHs（六六六）的质量浓度为5.36~16.57 ng/L, 均值为10.93 ng/L; 滴滴涕（DDTs)未检出; 沉积物中总HCHs的质量比为2.87~5.56 ng/g, 均值为4.34 ng/g; 条子河水和沉积物中PAHs的含量均为自上游至下游递减, 且枯水期>平水期>春汛期>丰水期; 条子河水中HCHs的质量浓度自上游至下游递增, 且丰水期>春汛期>平水期>枯水期, 沉积物中HCHs的质量比自上游至下游递减, 且枯水期>平水期>春汛期>丰水期; 条子河中的PAHs主要来源于煤炭燃烧和交通燃烧, HCHs主要来源于农药林丹的使用.     

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

正~~