高效液相色谱法检测蜂花粉中总维生素C

为了得到一种效果较好的测定蜂花粉中总维生素C含量的方法,本文采用高效液相色谱法对油菜蜂花粉进行总VC的定性与定量分析,从结果的稳定性、精密度和重现性三方面对其进行了考量.结果发现,总VC含量在12.70～200.00μg范围内与色谱峰面积呈良好的线性关系,且回收率在95.71%～98.60%,相对标准偏差为1.05%;稳定性实验的相对标准偏差为2.12%,精密度实验的相对标准偏差为1.1%;最终测得油菜蜂花粉样品的总VC平均含量为36.99 mg.(100g)-1,相对标准偏差为1.43%.本研究所建立的HPLC测定蜂花粉中总VC含量的方法简单快速、重现性好,可以较为准确的实现定性与定量分析.     

两种不同消解方法测定近海沉积物氮磷含量的比较

采用两种不同的消解方法—微波消解法和高压消解法,对近海沉积物中的总氮、总磷进行同时消解,并比较了测定结果.结果表明:高压消解条件下测定样品1和样品2总氮的相对标准偏差分别为7.7%和7.4%,总磷的标准偏差分别为3.9%和7.8%;微波消解条件下测定样品1和样品2总氮的相对标准偏差分别为9.4%和10.1%,总磷的相对标准偏差分别为6.9%和8.1%;两种消解条件下的总磷含量相差不大(样品1分别为0.460 mg/kg和0.454 mg/kg,样品2分别为0.449 mg/kg和0.439 mg/kg),但高压消解条件下的总氮含量(样品1为0.114 mg/kg,样品2为0.122 mg/kg)明显高于微波消解(样品1为0.088 mg/kg,样品2为0.092 mg/kg),且相对标准偏差较小.因此可以认为高压消解方法的精密度高于微波消解方法.     

GC/MS法测定尿中的8-羟基脱氧鸟苷

利用气相色谱/质谱(GC/MS)法测定尿中的8-羟基脱氧鸟苷(8OHdG)含量.根据MS的定性结果,强峰m/z 383对应的碱基 1(B 1)为8OHdG的特征离子峰.利用选择性离子扫描方式(SIM)进行定量分析,测定结果重复性较好,整个分析流程的系内相对标准偏差为4.23%,系间相对标准偏差为8.25%.该方法的检测限可达0.5 nmol/L,线性范围为5~10 000 nmol/L.分析尿样的相对标准偏差为5.12%,并测定了正常人和癌症病人尿中8OHdG的排放水平,癌症病人尿中8OHdG的排放水平明显高于正常人.     

离子选择性电极法测定乙烯利的含量

拟定了以氯离子选择电极为指示电极,饱和甘汞电极为参比电极,AgNO3标准溶液为滴定剂的电位滴定法测定乙烯利含量的分析方法.该方法简便、准确,标准偏差为0.07,相对标准偏差为0.46%.     

阳春砂仁中总黄酮、异槲皮苷和槲皮苷含量测定研究

建立阳春砂仁中异槲皮苷和槲皮苷含量的高效液相(HPLC)测定方法.异槲皮苷进样量在0.0183～0.0915 μg范围内有良好的线性关系,平均回收率为102.69%,相对标准偏差为0.70%(n=6);槲皮苷进样量在0.029 4～0.147 μg范围内线性关系良好,平均回收率为103.15%,相对标准偏差为0.68%(n=6).建立了紫外分光光度法测定砂仁中总黄酮含量的方法,采用槲皮苷为对照品,浓度在0～9.8 μg/mL.范围内线性关系良好,平均回收率为100.89%,相对标准偏差为1.19%(n=6).本方法简便快捷,可作为砂仁含量测定质量控制方法.     

高效液相色谱法测定葛枣弥猴桃叶中黄酮苷A的含量

采用高效液相色谱法测定了葛枣猕猴桃叶中一种黄酮苷类成分--山奈酚-3-O-α-L-鼠李糖基-(1→3)-α-L-鼠李糖基-(1→6)-β-D-吡喃半乳糖苷(黄酮苷A)的含量.用十八烷基硅烷键合硅胶做填充剂,甲醇-1%乙酸(乙酸体积分数为0.1%)做流动相,检测波长为267nm.结果表明:线性范围为0.099～9.99μg;平均回收率为102.3%;相对标准偏差为1.5%.     

酶联免疫法快速检测牛奶及其制品中的黄曲霉毒素B1

为了建立乳及乳制品中黄曲霉毒素B1的快速检测方法,对酶联免疫吸附法(ELISA)快速检测牛奶及其制品中的黄曲霉毒素B1进行灵敏度、准确度、精密度、重复性、重现性等方法学评价试验,并用高效液相色谱法进行验证。结果ELISA的灵敏度为0.03ng/ml,加标回收率为95.0%～104.2%,精密度相对平均偏差与相对标准偏差均为1.0%～1.6%,重复性的相对标准偏差为3.15%,再现性的相对标准偏差为8.21%。样品测定结果ELISA与液相色谱法的相对标准偏差小于10%。ELISA可以较快速地、准确地、大批量地检测牛奶及其制品中的黄曲霉毒素B1。     

断续流动原子荧光光谱法测定水中砷的研究与应用

建立一种氢化物原子荧光光度法测定自来水中砷(As)含量的方法.在实验条件下,测定自来水中的砷,经统计计算得标准偏差为2.65,相对标准偏差为0.87%.此方法可用于水中砷的测定.     

HPLC和GC对食用油脂中抗氧化剂BHA,BHT,TBHQ的测定

采用气相色谱法和高效液相色谱法分别对食用油脂中BHA,BHT,TBHQ等3种抗氧化剂进行定性定量分析.气相色谱法的线性相关系数为0.999 9,加标回收率为86.85%~109.95%,相对标准偏差为0.3%~3.38%,检出限在0.19~0.74μg之间;液相色谱法的线性相关系数为0.999 8,加标回收率为85.5%~107.1%,相对标准偏差小于1%.2种方法都具有检测快速、灵敏度高、重现性好、前处理简单等优点.     

原子荧光光谱法测定烟草中的砷和汞

研究了用原子荧光光谱法同时测定烟草中的砷和汞,烟草样品采用HNO3-H2O2消化体系微波消化,然后用原子荧光光谱法测定.在最佳微波消化条件和测定条件下,线性范围为:Hg 0.1~150μg/L、As 0.1~200μg/L,检出限均为0.035μg/L,汞测定的相对标准偏差为2.8%,砷测定的相对标准偏差为2.5%,汞的标准回收率为93%,砷的标准回收率为96%,结果令人满意.     

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.