乙醇酸氧化酶分子结构的研究和存在的问题

本文分析了乙醇酸氧化酶分子量相差很大的原因，但目前认为乙醇酸氧化酶为单一亚基所组成的观点难于解释为何乙醇酸氧化酶具有多个不是等电点，对等电点的正确认识将有助于揭示乙醇酸氧化酶分子结构。     

植物乙醇酸氧化酶的研究进展

乙醇酸氧化酶存在于细胞过氧化物酶体中,是光呼吸代谢的关键酶之一,能催化乙醇酸氧化生成乙醛酸,催化乙醛酸生成草酸;光呼吸与农业生产关系紧密.乙醇酸氧化酶是一种黄素蛋白,不同来源的乙醇酸氧化酶全酶分子质量和亚基相差很大.     

菠菜中不同等电点的乙醇酸氧化酶的提取和特性

从不同批次的菠菜绿叶中可纯化出5种不同活性和等电点（pI）的乙醇酸氧化酶（CO）．SDSPAGE表明它们均有40kD亚基,它们的比活会随蛋白浓度的增加而上升．第一种CO的pI〈8．3,比活为0．47U／mg,PAGE测定其全酶相对分子量（Mr）为280kD,280kD较稳定．第二种CO的pI〈8．3,但比活为3．44U／mg,PACE测定其Mr为560kD,但很快解聚为280kD．解释了前人报告CO的Mr大多为280kD．第三种CO的pI≈8．3,比活为8．4U／mg,放置后pI会下降至〈8．3,此时用PAGE测出其Mr为560kD．第四种CO的pI〉8．3,比活为27．8U／mg,放置pI也会下降为8．3．第五种CO的pI〉10．2,活性高达113U／mg,放置后其pI也会下降至〈8．3,由于CO的pI会下降,暗示低pI的CO可能并不存在于植物体内,而是实验中的娇作物．     

菠菜中高活性高等电点的乙醇酸氧化酶同工酶纯化方法的改进

通过缩短DEAE-celluloses柱长度,提高其洗脱液pH,可快速地从菠菜绿叶中纯化得到乙醇酸氧化酶同工酶,证实其具高活性113.0 U/mg·min和高等电点(pI)10.6.纯化后产率为0.14％,纯化倍数为66.5.经SDS-PAGE和毛细管电泳(CE-SDS)均只有40kD单带,说明已纯化至电泳纯.     

乙醇酸氧化酶和模式生物含有富苯丙氨酸的碱性蛋白

作者在之前研究中已证实提取的乙醇酸氧化酶(GO)实际上是GO和富phe碱性蛋白(BP)的混合物,BP因在SDS-PAGE中向负极泳动而容易被忽略.该文再次提取比活为113.4 U/(min.mg)的GO和BP的混合物.该混合物呈现phe的258 nm特征吸收峰,表明BP可能位于GO外部.类似的BP也可能存在于拟南芥、水稻等模式植物和大肠杆菌的粗蛋白中.     

雷公藤化学成分研究

从临沧雷公藤块根乙醇提取物石油醚部分中分离得到三个化合物，经光谱分析及理化数据分析，鉴定为β—谷甾醇(Ⅰ)、熊果酸(Ⅱ)、正三十烷酸(Ⅲ)。化合物Ⅲ首次从该植物中分到。     

长毛香科科脂溶性成分研究

对黔产长毛香科科(Teucrium pilosum(Pamp.)CY Wu et S.Chow)的化学成分进行研究,从乙醇提取物乙酸乙酯部份分离得到六个化舍物,经理化常数和波谱分析鉴定为:正十七烷(Ⅰ),正十六烷酸(Ⅱ),正十八烷酸乙二醇单酯(Ⅲ),正十六烷酸乙二醇二酯(Ⅳ),正二十四烷酸乙二醇单酯(Ⅴ),正二十五烷酸α-单甘油酯(Ⅵ).化合物Ⅰ～Ⅵ均是首次从该植物中分离得到.     

甘蓝型油菜乙醇酸氧化酶(GO)基因片段的克隆及hpRNA表达载体构建

通过PCR从甘蓝型油菜(Brassica napus)华双4号基因组DNA中扩增出乙醇酸氧化酶(GO)基因片段,DNA序列分析表明扩增GO基因片段的外显子部分与报道序列相同.以扩增出的GO基因片段作模板从一端设计引物扩增出一个相应的小片段.将GO基因大小两个片段反向连接,插入到植物表达载体2300-nap的napin启动子和nos终止子之间,植物表达载体2300-35S的35S启动子和nos终止子之间,分别构建成可转录表达出发夹RNA(hairpin RNA,hpRNA)结构的种子特异型和组成型油菜hpRNA干扰载体.     

西域旌节花化学成分研究

利用反复硅胶柱层析进行分离和纯化，从文山西域旌节花乙醇提取物乙酸乙酯部分分离得到五个化合物，通过理化方法及光谱分析鉴定为：三十酸（tricontanoic acid Ⅰ)，三十酸甲酯(methyl tricontanoateⅡ)，正二十六烷(hexacosaneⅢ)．正二十九烷(nonacosaneⅣ)，正三十醇(triacontanolⅤ)。所有化合物均系首次从该种植物分到。     

水稻乙醇酸氧化酶的纯化和特性分析

从水稻绿叶分离纯化得到一种单来基的乙醇酸氧化酶，其全酶分子量约为２６０ＫＤ，电泳特性表明该酶的ｐＩ〈８．３我们用改进的８％ＰＡＧＥ，结合Ｗｅｓｔｅｒｎ ｂｌｏｔ，测定水稻绍叶中还存在一种ｐＩ〉８．３的全酶Ｍｒ〉６６９ＫＤ的乙醇酸氧化酶。     

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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