几种工芳烃对鱼体内性激素水平的影响研究

选取了工业废水中普遍存在的几种氯代芳烃,以腹腔注射的方法对鲫鱼进行染毒。分另用放射免疫测定方法测定未染毒和染毒的鲫鱼体内的性激互（睾酮和１７β－雌二醇）含量,并对测定结果进行比较。结果发现染毒鲫鱼体内睾酮的浓度水平与未染毒鲫鱼体内睾酮水平相比存在着明显的差异,而１７β－雌二醇浓度水平与未染毒鲫鱼体内１７β－雌二醇水平相比基本上没有显著差异。表明上述氯代芳烃类化合物进入水生动物尤其是高等水生动物体内     

几种氯代芳烃对鱼体内性激素水平的影响研究

选取了工业废水中普遍存在的几种氯代芳烃 ,以腹腔注射的方法对鲫鱼进行染毒 .分别用放射免疫测定方法测定未染毒和染毒的鲫鱼体内的性激素 (睾酮和 17β -雌二醇 )含量 ,并对测定结果进行比较 .结果发现染毒鲫鱼体内睾酮的浓度水平与未染毒鲫鱼体内睾酮水平相比存在着明显的差异 ,而 17β -雌二醇浓度水平与未染毒鲫鱼体内 17β -雌二醇水平相比基本上没有显著差异 .表明上述氯代芳烃类化合物进入水生动物尤其是高等水生动物体内后 ,能显著影响睾酮的合成与释放及其正常生理功能 ,而对 17β -雌二醇的影响还需进一步的研究     

镉胁迫诱导鲫鱼红细胞的凋亡

分别用质量浓度为0.4、0.8、1.5和3.0 mg/L的Cd2+,对鲫鱼进行24、48、72和96 h的急性染毒实验.取鲫鱼尾部血液制作血涂片,镜检并统计分析细胞凋亡率,研究Cd2+胁迫诱导红细胞的凋亡.结果显示,在Cd2+浓度为0.4～3.0 mg/L的环境下,鲫鱼红细胞的凋亡率与Cd2+浓度、染毒时间之间均存在明显的剂量效应和时间效应关系;鲫鱼红细胞对Cd2+的最大耐受浓度:染毒24 h时,为1.5 mg/L,48 h为0.4 mg/L.说明Cd2+对鲫鱼红细胞的凋亡有较强的诱导作用.     

2-硝基-4''''-羟基二苯胺(HC Orange No.1)在鲫鱼体内富集行为研究

研究了鲫鱼暴露于0．9975mg／L2-硝基-4’-羟基二苯胺(HC OrangeNO．1)96h后在实验室鱼水系统中的归趋．用高效液相色谱分析了暴露鱼样和暴露水样在6h，12h，24h，36h，48h，60h，72h．96h的浓度．鱼样的回收率为84．4％～91．7％之间，相对标准偏差(RSD)为0．51％．HC Orange NO．1在水体中的浓度在24h内下降较快，之后维持稳定；鱼体中化合物的积累在36h达到最大，之后稍有下降．利用BCF的快速测定方法和传统方法算出的IgBCF分别为2．35和2．14。     

镉对鲫鱼胃肠道嗜银细胞密度的影响

以鲫鱼为研究对象,采用静水染毒法,设对照组和试验组(镉质量浓度0.05 mg/L,0.5 mg/L,5 mg/L)静养10 d,硝酸银染色方法显示鲫鱼胃肠道嗜银细胞,探讨了镉对鲫鱼胃肠道嗜银细胞密度的影响。结果表明,镉对鲫鱼前肠和中肠嗜银细胞数目有明显影响,表现在0.05 mg/L,0.5 mg/L浓度时前肠和中肠嗜银细胞数目明显增加,5 mg/L浓度时则减少;镉对鲫鱼后肠嗜银细胞的影响较小。     

重金属对鲫鱼的急性毒性及安全浓度评价

采用静水法生物测试研究了铜、锌、镉和铬对丰产鲫 (CarassiusauratusofPenze(♀ )×Cyprinusacutidorsalis (♂ ) )幼鱼的急性毒性 ,结果表明 :铜对鲫鱼为剧毒物质 ,镉为中毒物质 ,锌和铬为低毒物质 .4种重金属毒性大小顺序依次为Cu >Cd >Zn >Cr.铜、锌、镉和铬对鲫鱼的 2 4、4 8、72、96h的LC50 分别为 0 2 3、0 14、0 11、0 0 9mg/L ,11 17、8 68、6 86、5 85mg/L ,390 30、311 80、2 77 70、2 4 4 10mg/L和 39 40、32 2 5、2 7 2 0、2 2 2 5mg/L ,其安全质量浓度分别为 0 0 0 9、0 5 9、2 4 41和 2 2 3mg/L .铜对鲫鱼的安全质量浓度略低于渔业水域水质标准 ,锌、镉和铬的安全质量浓度远远高于标准 .     

N-甲基-5-甲氧基-2-硝基苯胺的合成

N-甲基．5．甲氧基．2．硝基苯胺是重要的医药中间体．这里以5-氯-2-硝基-苯胺（1）为起始原料，经取代、乙酰化、甲基化、去乙酰化得N-甲基．5．甲氧基-2-硝基苯胺（5），其结构经HNMR确证．     

结晶D—核糖生产废水处理研究

对结晶D－核糖生产工艺废水进行了实验室小试研究。结果表明,发酵母液经铁屑还原、石灰乳混凝沉淀,可使硝基苯含量降低50％以上;发酵母液经铁屑还原后与冷凝收集水混合再加甲醛缩合,苯胺去除率可达到99．5％以上;两种预处理方法均能提高后续生化处理的效果,最终出水可达到制药行业二级排放标准（CODcr=300mg/L,BOD5=60ml/L,苯胺＝2ml/L,硝基苯＝3mg/L）。     

汞对中国林蛙蝌蚪的毒性效应

为深入探讨汞对两栖类动物的致毒作用和机理,将中国林蛙(Rana chensinensis)蝌蚪暴露于含Hg2+的曝气自来水中,统计得出24,48,72和96h的半致死浓度(LC50)分别为1.048,0.849,0.609和0.488mg/L,并计算得出安全浓度(SC)为0.167mg/L.另外,将26～27期林蛙蝌蚪饲养在Hg2+质量浓度分别为10,20,30和40μg/L的曝气自来水中,染毒40d,分两时段测定其体内汞的含量,24h蝌蚪体内的汞含量表现为染毒初期出现多个富集高峰,10h后逐渐下降并稳定;每隔5d的采样测定结果表明,随染毒时间延长,蝌蚪体内总汞含量总体呈下降趋势.染毒30d后,各染毒组蝌蚪体内总汞含量基本稳定,且各染毒组蝌蚪体内总汞的平衡含量接近.蝌蚪急慢性汞中毒实验表明,汞污染对林蛙种群的正常生长有极大的负面影响.     

SBR法处理广东地区城市污水实验研究

采用SBR工艺对广州地区城市污水进行实验研究,结果表明：在一个反应装置内,可以达到既能去除有机物又能脱氮除磷的效果,处果后,出水BOD5浓度为5．12－13．62mg/L,去除率达85％－93％;出水COD浓度为10．7－32．2mg/L,去除率达82％－88％;出水NH3－N浓度在2．83－9．83mg/L,去除率达53％087％;出水TP浓度为0．1－0.45mg/L;去除率达85％－99％。     

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     

An affordable accurate evaluation of the binding conformations predicted by molecular docking studies in bio-system

Franck-Condon factors bridge the gap between theoretical modeling and experimental observations for molecular electronic spectroscopy and electron transfer.Under the displaced harmonic oscillator approximation,multidimensional Franck-Condon factors are decomposed into a product of many one-dimensional(1D)Franck-Condon(FC)factors,and each 1D-FC factor is associated with one Huang-Rhys factor that determines the leading contribution of     

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