反相高效液相色谱法测定肝组织中土霉素、四环素残留量

研究和发展了高灵敏度测定四环素类抗生素残留量的HPLC方法．用Hypersil C18(5μm,300 mm×4．6 mm ID)色谱柱,以乙腈-N,N-二甲基甲酰胺-0．01 mol／L草酸溶液为流动相,流速1．0 mL／min于356 nm处检测．土霉素、四环素分别在0．01-50．00μg／mL,0．02-50．00μg／mL范围内呈良好的线性关系,检出限分别为0．01 μg／ mL,0．02μg／mL(S／N=3),添加平均回收率分别为100．43％和100．48％,相对标准偏差分别为1．22％和1．52％ (n=5)．方法简单、分离度高,检出限低,重现性好,并成功应用于动物肝组织中土霉素、四环素残留量的测定．测定结果显示,部分地区市售动物肝组织中抗生素残留还存在超标现象．     

大鼠血浆中芦丁和槲皮素的RP-HPLC同时分析方法

建立测定大鼠血浆中芦丁和槲皮素含量的反相高效液相色谱(RP—HPLC)方法．用甲醇-乙酸(9:1, v／v)去血浆样品中蛋白质处理,以香兰素作内标,采用Century SIL C18BDS(250 mm×4．6 mm,5μm)色谱柱, 以甲醇-水-磷酸(45:53:0．02)为流动相,流速为0．7 ml／min;紫外检测波长为370nm,柱温为室温,进样量 10 μl．芦丁的定量限为0．068 μg／ml,线性范围为0．068～8．6 μg／ml;槲皮素的定量限为0．0502μg／ml,线性范围为0．0502～13μg／ml．芦丁和槲皮素的平均回收率分别为95．3％,RSD=4．1和90．3％,RSD=2．53(n =6),芦丁的日内及日间精密度的相对标准差分别小于13．2％和9．9％,而槲皮素的日内及日间精密度的相对标准差分别为小于13．9％和11．3％．该方法简单、快速、灵敏度高、重复性良好,可作为芦丁和槲皮素体内样品的分析方法．     

阳离子交换固相萃取在三聚氰胺检测的应用

采用阳离子交换固相萃取小柱分离富集液态奶中三聚氰胺，用甲醇洗脱后，以C8反相柱离子对液相色谱分析测试三聚氰胺含量．实验中考察了操作条件对液态奶中三聚氰胺测定结果的影响，对固相萃取前处理条件进行了优化，结果表明，固相萃取前处理过程的最佳洗脱体积8mL，流速0．5mL／min．工作曲线方程为Y=4．0963x＋21．508，相关系数为R^2=0．9978，相对标准偏差小于3．1％，回收率在96．4％-102．9％之间，结果令人满意．     

HPLC法测定穿金益肝片中大黄素的含量

用C18ODS为固定相,甲醇-0．1％磷酸(85：15)为流动相,建立一种高效液相色谱法测定穿金益肝片中大黄素的含量,检测波长为290nm。结果是进样量在0．05175-0．5175 μg范围内线性关系良好(r=0．9998),平均回收率为98.56％,RSD为1．59％(n=5)。该方法简便,准确,重复性好,可作为该制剂的含量测定方法。     

固相微萃取联用气相色谱测定水中的多环芳烃

采用溶胶-凝胶法制备的离子液体键合固相微萃取涂层联用气相色谱测定水中的萘、联苯、芴、菲、荧蒽5种多环芳烃(PAHs).对固相微萃取的条件进行优化.方法的检测限为0.0005～0.05μg/L,线性范围在0.1～100 μg/L,相对标准偏差(RSD)不大于5.3％.对东湖水样进行测定,未检测到5种多环芳烃,其回收率为71.0％～107.9％.     

固相微萃取——高效液相色谱联用测定水样中的痕量苯并（k）荧蒽

研究了固相微萃取(SPME)——高效液相色谱(HPLC)联用测定水样中痕量苯并(k)荧蒽的的分析方法。对SPME的条件如萃取时间、萃取温度、离子强度、解吸溶剂、解吸时间和HPLC条件进行了优化，建立了SPME-HPLC联用分析水样中痕量苯并(k)荧蒽的方法，并用于自来水、雨水和纯净水等实际水样的分析。SPME优化的条件为室温、搅拌速度l100r／min、萃取时间30min、甲醇解吸溶剂、解吸时间2min。HPLC的条件为C18反相色谱拄、甲醇流动相、流速为1mL/min、紫外检测器、波长244nm，以峰高为测量信号。方法的线性范围为0—8．00μg/L，检出限为0．014μg/L，相对标准偏差(n＝6)为6．7％，回收率为82．0％-104．2％。该方法适合于水样中痕量苯并(k)荧蒽的分析。     

固相萃取-气相色谱/质谱法测定河水中16种多环芳烃

建立了固相萃取-气相色谱/质谱联用测定河水中16种多环芳烃(PAHs)的分析方法。结果表明,以C18为固相萃取柱、10 mL正己烷为洗脱剂,在上样速率为5 mL/min的条件下,用于河水中16种PAHs的检测,均有较好的回收率,在1～200μg/L范围内呈良好的线性关系,相关系数在0.999 46～0.999 99之间,检出限为0.002 6～0.081 3μg/L,加标回收率为91%-119%,相对标准偏差(RSD)在2.4%～9.2%(n=6)之间。方法简便可靠,能够达到水样中16种多环芳烃的检测要求。     

用高效液相色谱法测定海泥中的维生素D3

用氯仿萃取海泥样品中的维生素D3，并用高效液相色谱法(HPLC)测定其含量．色谱柱选用C18柱，流动相为V(甲醇)：V(水)=98：2，流速为1．5mL／min，紫外检测器检测波长为253nm．加入标样后，回收率为93．6％～94．8％，相对标准偏差小于1．90％．实验结果表明，该方法操作简便，分析速度快，结果准确．     

超声辅助萃取-高效液相色谱荧光检测法测定贻贝中的多环芳烃

建立了超声波辅助萃取,高效液相色谱荧光检测法测定贻贝中6种多环芳烃化合物的多残留分析方法。对荧光检测条件、色谱分离条件、萃取方式、净化条件进行了优化。在优化条件下,6种多环芳烃化合物实现良好分离,在0．002～0．5mg／L范围内呈良好线性关系,线性相关系数为0．9985-0．9995,检出限为1．0-2．0μg／kg,回收率为78％-92％,相对标准偏差为2．8％～6．3％（n=6）。结果表明：建立的超声辅助萃取-高效液相色谱荧光检测法样品前处理简单,重现性好,回收率高,适合贻贝中多环芳烃的检测。     

反相高效液相色谱法测定三白草中槲皮素和芦丁的含量

采用反相高效液相色谱法 (RP -HPLC)在C1 8色谱柱上以甲醇 :0 .2 %磷酸溶液 (5 0∶5 0 )为流动相测定了三白草中槲皮素和芦丁的含量 .流动相的流速为 1mL min ,检测波长 370nm .结果表明槲皮素在 0 .0 0 8-0 0 84 μg、芦丁在 0 .0 5 4 - 0 .5 4 0 μg范围内呈良好的线性关系 ,相关系数分别为 0 .9988和 0 .9999.槲皮素回收率为 99% ,RSD为 2 .0 % (n =5 ) ,芦丁为 10 6 % ,RSD为 1.4 % (n =5 ) .     

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…     

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。     

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     

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     

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

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An on-line scaling method for improving scalability of a database cluster

The explosive growth of the Internet and database applications has driven database to be more scalable and available, and able to support on-line scaling without interrupting service. To support more client's queries without downtime and degrading the response time, more nodes have to be scaled up while the database is running. This paper presents the overview of scalable and available database that satisfies the above characteristics. And we propose a novel on-line scaling method. Our method improves the existing on-line scaling method for fast response time and higher throughputs. Our proposed method reduces unnecessary network use, i.e. , we decrease the number of data copy by reusing the backup data. Also, our on-line scaling operation can be processed parallel by selecting adequate nodes as new node. Our performance study shows that our method results in significant reduction in data copy time.     

An improved R-tree based on childnode''s probability

R-Tree is a good structure for spatial searching. But in this indexing structure,either the sequence of nodes in the same level or sequence of traveling these nodes when queries are made is random. Since the possibility that the object appears in different MBR which have the same parents node is different, if we make the subnode who has the most possibility be traveled first, the time cost will be decreased in most of the cases. In some case, the possibility of a point belong to a rectangle will shows direct proportion with the size of the rectangle. But this conclusion is based on an assumption that the objects are symmetrically distributing in the area and this assumption is not always coming into existence. Now we found a more direct parameter to scale the possibility and made a little change on the structure of R-tree, to increase the possibility of founding the satisfying answer in the front sub trees. We names this structure probability based arranged R-tree (PBAR-tree).     

Integrating GIS Web services based on mediating architecture

The geographic information service is enabled by the advancements in general Web service technology and the focused efforts of the OGC in defining XML-based Web GIS service. Based on these models, this paper addresses the issue of services chaining,the process of combining or pipelining results from several interoperable GIS Web Services to create a customized solution. This paper presents a mediated chaining architecture in which a specific service takes responsibility for performing the process that describes a service chain. We designed the Spatial Information Process Language (SIPL) for dynamic modeling and describing the service chain, also a prototype of the Spatial Information Process Execution Engine (SIPEE) is implemented for executing processes written in SIPL. Discussion of measures to improve the functionality and performance of such system will be included.     

Tracking data management using topology of moving object database system for moving object constrained trajectory in LBS application

Advances in wireless technologies and positioning technologies and spread of wireless devices, an interest in LBS (Location Based Service) is arising. To provide location based service, tracking data should have been stored in moving object database management system (called MODBMS) with proper policies and managed efficiently. So the methods which acquire the location information at regular time intervals then, store and manage have been studied. In this paper, we suggest tracking data management techniques using topology that is corresponding to the moving path of moving object. In our techniques, we update the MODBMS when moving object arrived at a street intersection or a curved road which is represented as the node in topology and predict the location at past and future with attribute of topology and linear function. In this technique, location data that are corresponding to the node in topology are stored, thus reduce the number of update and amount of data. Also in case predicting the location,because topology are used as well as existing location information, accuracy for prediction is increased than applying linear function or spline function.