三氟乙酰丙酮—铀(Ⅵ)、钍、锆和稀土螯合物的薄层层析分离

本文以硅胶G为吸附剂,选用二十三种不同的展开溶剂,对铀(Ⅵ)、钍、锆和稀土—三氟乙酰丙酮螯合物的薄层层析行为进行了系统的研究。在适当的PH值介质中(一般PH 4～6)合成了金属—TFA螯合物;并用环己烷进行革取。实验结果表明:以石油醚—乙酰丙酮(2:1),环己烷—乙酰丙酮(4:1),二氯甲烷—乙酰丙酮(6:1)为展开剂时,能成功地分离Ce(TFA)_3—La(TFA)_3,Ce(TFA)_3—Pr(TFA)_3,Th(TFA)_4—Ce(TFA)_3—Y(TFA)_3,Sc(TFA)_3—Ce(TFA)_3—La(TFA)_3,Th(TFA)_4—UO_2(TFA)_2—La(TFA)_3,Sc(TFA)_3—Th(TFA)_4—Ce(TFA)_3—Zr(TFA)_4和Sc(TFA)_3—Th(TFA)_4—Ce(TFA)_4—Ho(TFA)_3等多种混合物。     

菜芙蓉总黄酮纯化及其体内抗氧化性

为研究菜芙蓉总黄酮(TFA)的纯化条件及体内抗氧化性,采用AB-8大孔树脂静态吸附-洗脱工艺,控制纯化条件为上样液质量浓度0.1g/mL,pH值为3.5,解吸液乙醇体积分数为70%,解吸液体积与树脂质量比为20∶1(mL/g)。在最优纯化条件下,黄酮的质量分数提高到48.50%;与正常对照组相比,实验组小鼠器官指数无显著差异(P0.05);小鼠血清和肝组织中MDA含量显著低于正常对照组(P0.05),而CAT,GSH-Px和SOD活性均高于正常对照组且具有明显的量效关系。实验结果表明,TFA具有良好的体内抗氧化效果。     

甜菜果胶中性糖的水解方法及定量分析

为测定甜菜果胶中性糖的种类及含量,建立了针对甜菜果胶中性糖的两步水解法.该法采用果胶酶、三氟乙酸(TFA)依次水解甜菜果胶的中性糖.首先,甜菜果胶被果胶酶水解为相对分子质量较小的组分;其次,在TFA作用下,中性单糖从甜菜果胶分子上逐步释放到水解液中.在受试的3种商业酶制剂中,果胶酶Rapidase C80因其酶解效果好、内源性单糖少等优点被选为目的果胶酶.研究结果表明,C80的最适酶解条件为50℃、pH5、15 h.在C80酶解的基础上,进一步研究TFA浓度、酸解温度、酸解时间对中性糖水解效果的影响.综合评价中性糖水解率与降解率的关系后,确定适宜的TFA浓度、温度、时间分别为1 mol/L、110℃、4 h.高效阴离子交换色谱(HPAEC)分析结果表明,两步水解法对鼠李糖的水解效果显著,且该法稳定性好、可重复性高,能够满足甜菜果胶中性糖定量分析的需要.     

芬戈莫德的简便合成

研究了一种芬戈莫德的简便合成方法.以正辛基苯为起始原料,通过5步反应合成芬戈莫德,总收率为9.7%.主要步骤包括傅克酰基化、三乙基硅烷/TFA还原、取代、双亨利反应以及氢化反应.目标产物结构通过核磁共振图谱、熔点确证,并与文献报道一致.该合成方法具有经济、便于操作和绿色化学特点.     

Eptifibatide的固相合成及分离纯化

Eptifibatide是一种血小板糖蛋白GPⅡb/Ⅲa受体拮抗剂,临床研究结果显示其医用上的产业前景良好.采用Rink-Am-Resin树脂作为固相载体,Fmoc为保护策略固相合成了Eptifibatide.以DMF为反应溶剂,Piperidine-DMF脱去Fmoc保护基团,以TBTU/HOBt/DIEA作为肽键缩合试剂进行接肽反应,用TFA/EDT/TIS/H2O定量地从树脂上切除,制备型高效液相色谱分离纯化粗肽.同时对产品进行色谱分析和质谱鉴定.实验结果表明Fmoc合成策略中各步的缩合率均在95%以上,多数在99%以上.粗肽纯度为86.8%,产率为55%.分离纯化后的产物纯度达到98.5%,MOLDI-TOF质谱测得的m/z与理论值相符.为化学合成Eptifibatide及其分离纯化提供了一条切实可行的路线.     

衍生化气相色谱法测定水样中的铬

在 p H5 - 6的 HAc- Na Ac缓冲溶液中 ,铬 ( )与三氟乙酰丙酮(HTFA)形成热稳定挥发性螯合物 Cr(TFA) 3 ,用苯萃取后采用气相色谱法测定。该法准确、灵敏度高 ,完全适合于水中铬的测定 ,检测限 2 μg/ L,加标回收率 94 .8- 99.1%。     

铜绿微囊藻胞内毒素(Microcystin-LR)提取条件的优化实验

结合HPLC定量分析了藻毒素提取条件对提取纯培养铜绿微囊藻(Microcystis aeruginosa)胞内毒素效率的影响,优化并建立了胞内藻毒素Microcystin-LR(MCLR)提取流程:藻液离心后中加入w(甲醇)=75%萃取剂,冻融和超声破碎后离心收集上清液并进行固相萃取,分别以w(甲醇)=10%淋洗,以w(甲醇)=80%+w(TFA)=0.05%洗脱SPE柱,最后收集到较纯的微囊藻毒素MCLR.     

反相高效液相色谱法测定PELA微粒中胰岛素含量

为测定PELA微粒中胰岛素含量,建立反相高效液相色谱方法. 以Zorbax300SB-C18高效液相色谱柱分离;检测波长为220 nm;流动相组成为:V(H2O(含φ(TFA)＝0.15%))∶V(CH3CN)＝66∶34;保留时间为4.3 min. 结果在ρ(胰岛素)为10～200 μg/mL范围内,峰面积(A)与胰岛素质量浓度(ρ)成线性变化,其线性方程为:ρ=7.82×10-2A +9.88×10-2,相关系数r=0.999 95. 日内差和日间差分别为0.6%和0.7%. 当ρ(胰岛素)为60, 80和100 μg/mL时的回收率分别为(98.1±0.5)%, (99.6±1.5)%和(99.4±1.0)%(n＝6). 测得胰岛素在PELA微粒中的包封率为(56.3±3.3)%(n＝6).     

Template—free electrosynthesis of aligned poly（p—phenylene） microtubules

Poly （p-phenylene)(PPP) microtubules with diameters of 0.2-0.8μm and lengths of -10μm have been synthesized by direct oxidation of benzene in the mixed electrolyte of boron trifluoride diethyl etherate(BFEE)and trifluoroacetic acid(TFA)(BFEE:TFA=2:1,by volume),containing a certain amount dodecylbenzene-sul-fonate(SDBS)as surfactant.The microtubules were grown vertically on the working electrode surface.The tubular morphology has been confirmed by scanning and transmission electron microscopies and the chain structure of the skin of the tubules has been characterized by Raman spectros-copy.The electrode property,monomer/surfactant molar ration and the value of applied potentical have strong effects on the morphology of the microtubules.     

内吗啡肽-2的合成研究

用液相多肽合成法合成具有镇痛作用的μ阿片受体的内源性配体———内吗啡肽-2.直接使用叔丁氧羰基保护的有关氨基酸,采用DCC/HOB t缩合法和混合酸酐法分别合成N-端二肽片段和C-端二肽片段,然后将N-端二肽片段和C-端二肽片段缩合成四肽,最后用50%的TFA/DCM脱除保护基,成功地合成了内吗啡肽-2.本实验方法与文献相比,步骤减少,后处理简便,收率提高.     

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.     

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.     

A computer generator for randomly layered structures

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

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.     

海南岛地体及其毗邻陆缘晚中生代—新生代古地磁研究和构造演化

本文叙述了对海南岛及其毗邻大陆边缘白垩纪到第四纪地层岩石进行古地磁研究的全部工作过程。通过分析岩石中剩余磁矢量的磁偏角及磁倾角的变化,提出海南岛白垩纪以来经历的构造演化模式如下:早期伴随顺时针旋转而向南迁移,后期伴随逆时针转动并向北运移。联系该地区及邻区的地质、地球物理资料,对海南岛上述的构造地体运动提出以下认识:北部湾内早期有一拉张作用,主要是该作用使湾内地壳显著伸长减薄,形成北部湾盆地。从而导致了海南岛的早期构造运动,而海南岛后期的构造运动则主要是受南海海底扩张的影响。海南地体运动规律的阐明对于了解北部湾油气盆地的形成演化有重要的理论和实际意义。     

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.     

《Chinese Science Bulletin》SUBJECT INDEX TO VOLUME 59(2014)

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Achieving Unusual States of Matter Under High Pressure

The elongation method,originally proposed by Imamura was further developed for many years in our group.As a method towards O(N)with high efficiency and high accuracy for any dimensional systems.This treatment designed for one-dimensional(ID)polymers is now available for three-dimensional(3D)systems,but geometry optimization is now possible only for 1D-systems.As an approach toward post-Hartree-Fock,it was also extended to     

Exciton Seebeck in Molecular Systems

Various applications relevant to the exciton dynamics,such as the organic solar cell,the large-area organic light-emitting diodes and the thermoelectricity,are operating under temperature gradient.The potential abnormal behavior of the exicton dynamics driven by the temperature difference may affect the efficiency and performance of the corresponding devices.In the above situations,the exciton dynamics under temperature difference is mixed with