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.     

模拟污水中氮,磷对水稻劝苗过氧化氢酶和乙醇酸氧化酶…

以水稻为材料，研究了不同深度的模拟污水中Ｎ、Ｐ对幼苗过氧化氢酶（Ｃａｔａｌａｓｅ，ＣＡＴ，ＥＣ１．１１．１．６）、乙醇酸氧化酶（Ｇｌｙｃｏｌａｔｅｏｘｉｄａｓｅ，ＧＯ，ＥＣ１．３．３．１）、过氧化和物酶（Ｐｅｒｏｘｉｄａｓｅ，ＰＯＤ，ＥＣ１．１１．１．７）和叶绿素含量的影响。结果表明：低浓度Ｎ、Ｐ浓度分别超过８．５６ｍｍｏｌ．Ｌ＾－１和０－０．２ｍｍｏｌ．Ｌ＾－１范围）可诱导ＣＡＴ活性增大，而后下     

兔角膜上皮特异性水溶性蛋白质的电泳分析

分离兔角膜上皮和皮肤表皮，提取水溶性蛋白质，采用ＳＤＳ－ＰＡＧＥ以及ＩＥＦ／ＳＤＳ－ＰＡＧＥ技术对其组成进行分析研究，发现兔角膜上皮存在５种主要特异性水溶性蛋白质，其分子量和等电点分别为：Ｍｒ６８２００，ｐＩ７．５；Ｍｒ６１７００，ｐＩ５．１；Ｍｒ５１３００，ｐＩ７．６；Ｍｒ３６３００，ｐＩ８．９和Ｍｒ２５７００，ｐＩ５．７。     

介质对酸解离常数的影响──CTS—NaClO_4－C_2H_5OH－H_2O体

用电位滴定法测定了在２９３±０．Ｋ时以ＮａＣｌＯ＿４为支持电解质、在乙醇－水混合溶剂中变色酸（ＣＴＳ：３，６－二磺酸钠－１，８－二羟基萘酚）的解离常数，并考察了该常数随溶液离子强度和溶剂组成的变化规律。溶液离子强度的变化范围为Ｉ＝０．１～４．０ｍｏＬｄｍ－３，溶剂中乙醇的重量百分数为０－５０％。用基于Ｐｉｔｚｅｒ方程的最小二乘多项式逼近法确定了各种不同组成的混合溶剂中酸的热力学解离常数发现该常数的对数值ｌｇＫ＿０与混合溶剂中有机组分的摩尔分数（ｘ）及混合溶剂的介电常数（Ｄ）遵守下列经验公式：式中Ｋ＿ｘ、Ｋ＿Ｄ、Ｃ＿１和Ｃ＿２皆为经验常数。     

中华眼镜蛇毒神经生长因子的研究

采用ＣＭ－ＳｅｐｈａｒｏｓｅＣＬ－６Ｂ和ＳｅｐｈｏｓｉｌＣ８以及ＨＰＬＣ层析方法，自广西产中华眼镜蛇毒中分离纯化神经生长因子（ＮＧＦ），此ＮＧＦ经８ｄ鸡胚背根神经节体外培养证明具有促进神经纤维生长的活性。经ＨＰＬＣ及聚丙烯酰胺凝胶电泳鉴定为单一组成，经ＳＤＳＰＡＧＥ及ＨＰＬＣ测定分子量分别为２４．１ＫＤ和２４．９ＫＤ，等电聚焦电泳测得ｐＩ为８．２，氨基酸组分分析表明ＮＧＦ含酸性氨基酸较少，通过１２５｜标记ＮＧＦ测定出ＮＧＦ在生物体内主要分布于肾、肺、及周围神经     

催化光度法测定痕量银Ag(I)-α,α''-Dipy-K_2S_2O_8-ECR体系

用光度法研究了Ａｇ（Ⅰ）－α，α’－ＤｉＰｙ．－Ｋ２Ｓ３Ｏ８－ＥＣＲ催化体系．确定了最佳测定条件为：３．０×１０－３Ｍα，α’－Ｄｉｐｙ，３．８×１０－２Ｍ Ｋ２Ｓ３Ｏ８，１．２Ｘ１０－４Ｍ ＥＣＲ和ｐＨ５．０．方法灵敏，其检测限为１× １０－９ｇ／ｍｌ．本法用于测定氯化银溶度积，经果与文献值相符．     

热激对高温敏感核不育水稻芽生长及其蛋白质组分的影响

温敏不育水稻培矮６４Ｓ芽期经热激（３８℃）处理后,与其在２２℃条件下相比较,芽蛋白组分表现出明显差异;在大于９７．４ＫＤ、小于１４．４ＫＤ和６６．２～４２．７ＫＤ范围内分别新增２条、１条和３条蛋白质带,另有８条带加强（４２．７～１４．４ＫＤ）和２条带减弱（９７．４～４２．７ＫＤ）。与热激条件下的常规稻湘晚籼２号比较,培矮６４Ｓ经热激（３８℃）后新增了４条蛋白质带,另有２条带加强和１条带减弱。在热激后,温敏不育水稻培矮６４Ｓ芽中蛋白质组分的这些变化,必然引起植株体内某些酶系统的改变,以致影响芽的正常生长发育,使芽的生长受到明显的抑制。     

十二钨硅酸及其6DMF,8DMSO加合物的标准生成焓测定

通过一系列滴定量热测定，求得了２９８．１５Ｋ时十二钨硅酸及其６ＤＭＦ、８ＤＭＳＯ加合物的标准生成焓，其数值分别为－（１３．１４±０．０１）×１０＾３ＫＪ·ｍｏｌ＾－１、－（１３．６１±０．０１）×１０＾３ＫＪ·ｍｏｌ＾－１及－（１３．８６±０．０１）×１０＾３ＫＪ·ｍｏｌ＾－１。     

乙醇酸氧化酶研究进展

概述乙醇酸氧化酶研究存在的问题和进展，指出乙醇酸氧化酶被认为只含单种亚基，但该观点难于解释不同植物乙醇酸氧化酶为何等电点（pI）相差较大。首次介绍乙醇酸氧化酶 是种至少有GOI(pI≈7.4)、GOⅡ(pI≈9.4)和GOⅢ(pI≈8.3)的同工酶，以及GOⅠ只含单种亚基，GOⅡ和GOⅢ则可能含两种亚基的新观点。     

假单胞菌DM11的二氯甲烷脱卤素酶研究：Ⅱ.动力学性质和…

对来自假单胞菌ＤＭ１１菌株的二氯甲烷脱卤素酶的动力学性质和抑制剂进行了研究，用１／Ｖ对１／［ｓ］作图法，测出ＤＭ１１脱素酶以ＣＨ２Ｃｌ２，ＣＨ２Ｂｒ，ＣＨ２ｌ２，ＣｌＣＨ２Ｂｒ和ＣｌＣＨ２Ｉ等５种化合物为底物时的Ｋｍ值分别是６７，２０，５５、７和９μｍｏｌ／Ｌ，比活力分别是７７．８，１２３．３，７８．８，５６．１和６０．３ｍｋａｔ／ｋｇ蛋白，测定了１４种抑制剂对ＤＭ１１脱卤素酶的５０％抑制浓度，甲     

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.     

Characterization of Ordovician carbonate reservoirs, southeastern Saskatchewan, Canada

The discovery of the prolific Ordovician Red River reservoirs in 1995 in southeastern Saskatchewan was the catalyst for extensive exploration activity which resulted in the discovery of more than 15 new Red River pools. The best yields of Red River production to date have been from dolomite reservoirs. Understanding the processes of dolomitization is, therefore, crucial for the prediction of the connectivity, spatial distribution and heterogeneity of dolomite reservoirs.The Red River reservoirs in the Midale area consist of 3～4 thin dolomitized zones, with a total thickness of about 20 m, which occur at the top of the Yeoman Formation. Two types of replacement dolomite were recognized in the Red River reservoir: dolomitized burrow infills and dolomitized host matrix. The spatial distribution of dolomite suggests that burrowing organisms played an important role in facilitating the fluid flow in the backfilled sediments. This resulted in penecontemporaneous dolomitization of burrow infills by normal seawater. The dolomite in the host matrix is interpreted as having occurred at shallow burial by evaporitic seawater during precipitation of Lake Almar anhydrite that immediately overlies the Yeoman Formation. However, the low δ18O values of dolomited burrow infills (-5.9‰～ -7.8‰, PDB) and matrix dolomites (-6.6‰～ -8.1‰, avg. -7.4‰ PDB) compared to the estimated values for the late Ordovician marine dolomite could be attributed to modification and alteration of dolomite at higher temperatures during deeper burial, which could also be responsible for its 87Sr/86Sr ratios (0.7084～0.7088) that are higher than suggested for the late Ordovician seawaters (0.7078～0.7080). The trace amounts of saddle dolomite cement in the Red River carbonates are probably related to "cannibalization" of earlier replacement dolomite during the chemical compaction.     

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.     

A computer generator for randomly layered structures

AcomputergeneratorforrandomlylayeredstructuresYUJia shun1,2,HEZhen hua2(1.TheInstituteofGeologicalandNuclearSciences,NewZealand;2.StateKeyLaboratoryofOilandGasReservoirGeologyandExploitation,ChengduUniversityofTechnology,China)Abstract:Analgorithmisintrod…     

An Index mechanism for multi-scale view in spatial databases

There are numerous geometric objects stored in the spatial databases. An importance function in a spatial database is that users can browse the geometric objects as a map efficiently. Thus the spatial database should display the geometric objects users concern about swiftly onto the display window. This process includes two operations:retrieve data from database and then draw them onto screen. Accordingly, to improve the efficiency, we should try to reduce time of both retrieving object and displaying them. The former can be achieved with the aid of spatial index such as R-tree, the latter require to simplify the objects. Simplification means that objects are shown with sufficient but not with unnecessary detail which depend on the scale of browse. So the major problem is how to retrieve data at different detail level efficiently. This paper introduces the implementation of a multi-scale index in the spatial database SISP (Spatial Information Shared Platform) which is generalized from R-tree. The difference between the generalization and the R-tree lies on two facets: One is that every node and geometric object in the generalization is assigned with a importance value which denote the importance of them, and every vertex in the objects are assigned with a importance value,too. The importance value can be use to decide which data should be retrieve from disk in a query. The other difference is that geometric objects in the generalization are divided into one or more sub-blocks, and vertexes are total ordered by their importance value. With the help of the generalized R-tree, one can easily retrieve data at different detail levels.Some experiments are performed on real-life data to evaluate the performance of solutions that separately use normal spatial index and multi-scale spatial index. The results show that the solution using multi-scale index in SISP is satisfying.     

Jane Eyre——A Feminist In The 19th Century

In the 19th century the society was controlled by men, and women were just appendants of them, they had not any rights and freedom. But Jane was an exception, she showed some characteristics of early feminist. Jane showed her characteristics of feminism in three aspects: rebellion, equality, and independence. These characteristics were helpful to her success, and feminism is the only way out for women of that time.     

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-