猪肚木叶挥发油的气相色谱-质谱分析

采用水蒸气蒸馏法提取猪肚木叶中的挥发油,用GC毛细管柱进行分析,归一化法测定其相对含量,并用GC-MS法鉴定化学成分,结果分离出27个峰,鉴定出26种化学成分,占挥发油总量的98.85%.猪肚木叶挥发油中主要成分为邻苯二甲酸二异丁酯(36.08%)、邻苯二甲酸-二(2-乙基己基)酯(13.82%)、正十六碳酸(8.32%)、(Z,Z,Z)-9,12,15-十八碳三烯-1-醇(9.61%)等.     

恩施山区鱼腥草挥发油的化学成分分析

对人工栽培鱼腥草和野生鱼腥草的挥发油进行化学成分分析.用水蒸汽蒸馏法提取挥发油,并用气相色谱-质谱(GC-MS)联用仪对其挥发油化学组分进行分离和鉴定.分离并鉴定出人工栽培鱼腥草挥发油中52种成分,占总峰面积的97.71%;野生鱼腥草挥发油中70种成分,占总峰面积的94.94%.其主要化学成分为:β-蒎烯、β-月桂烯、甲基正壬酮、桧烯、α-蒎烯、柠檬烯、癸酸乙酯、乙酸龙脑酯等.结果表明,人工栽培鱼腥草和野生鱼腥草挥发油的化学成分有差异,但主要的活性成分基本一致.     

苏木挥发油成分的GC-MS分析

目的:分析苏木挥发油化学成分,为其开发利用和质量评价提供科学依据.方法:采用水蒸气蒸馏法提取苏木挥发油,采用GC-MS法鉴定挥发油化学成分.结果:检出38个色谱峰,鉴定出16个化合物,占挥发油总量的42.01%.其中(Z,Z)-9,12-十八碳二烯酸(10.53%),邻苯二甲酸二丁酯(5.02%),(E,E)-2,4-癸二烯醛(4.36%),邻苯二甲酸异壬酯(3.01%),桉油烯醇(2.27%),1,2,3,4-四氢化-5-甲基-1-3-异丙氧基萘(2.08%)是主要成分,占挥发油总量的27.27%.结论:苏木挥发油进一步研究及开发利用提供科学依据.     

甘肃庆阳地椒草茎部挥发油化学成分的研究

研究甘肃庆阳地椒草(Thymus quinquecostatus Celak)茎部挥发油的化学成分。采用水蒸汽蒸馏法提取地椒草茎中的挥发油;经气相色谱-质谱技术分离和鉴定,用归一化法测定其相对百分含量。从挥发油中共分离和鉴定出了76种化学成分。地椒草茎中的主要成分有香芹酚(20.112%)、2-乙酮基-3,5-二甲氧基-苯酚(9.209%)、乙酸乙酯(6.536%)、桉油精(5.938%)等。为进一步研究地椒草药理作用提供了科学依据。     

植物马桑中挥发油成分的GC-MS分析

利用水蒸气蒸馏法提取马桑叶和茎中的挥发油,并采用气-质联用(GC-MS)方法对挥发油中化学成分进行分析.鉴定出了马桑叶和茎中的挥发油成分中的20及26种化合物,马桑叶挥发油中所鉴定出的主要成分为二苯胺和邻苯二甲酸异丁酯,含量分别为10.22%和10.07%.马桑茎挥发油中鉴定出的主要成分也为二苯胺和邻苯二甲酸异丁酯,但含量与马桑叶中不同,分别为1.61%和1.05%.     

四川杜鹃花中挥发性成分的研究

水蒸气蒸馏法从四川杜鹃的花中提取挥发油,用气相色谱-质谱联用技术对其挥发油化学成分进行分离和结构鉴定,从四川杜鹃的花挥发油中总共分离出53个组分,鉴定出51个组分。用气相色谱面积归一化法确定了各个组分的相对百分含量,其挥发油主要组分是石竹烯(12.48%)、愈创醇(8.83%)、α-蒎烯(8.32%)、β-蒎烯(7.78%)、β-紫罗兰酮(6.83%)等。     

苗药铁筷子挥发油的化学成分分析及抑制BGC-823细胞增殖研究

目的:研究苗药铁筷子挥发油成分及挥发油抗肿瘤作用。方法:采用水蒸气蒸馏法提取铁筷子挥发油,利用GC-MS联用仪分析铁筷子挥发油的化学成分。CCK8法检测苗药铁筷子挥发油对BGC-823细胞增殖的抑制作用。结果:从苗药铁筷子挥发油中鉴定了33种化合物,共占挥发油的89.71%,苗药铁筷子挥发油中主要含有棕榈酸占总油量的19.99%、亚油酸占总油量的13.27%、油酸占总油量的10.99%。抗肿瘤活性表明苗药铁筷子挥发油对BGC-823细胞的增殖抑制作用,IC_(50)值为11.793μg/mL。结论:苗药铁筷子挥发油可抑制BGC-823细胞的增长。     

串钱柳挥发油化学成分及其抗细菌活性

【目的】阐明串钱柳叶片和果实挥发油的化学组成及其抗细菌活性,以期为串钱柳的综合开发和利用奠定基础。【方法】采用水蒸气蒸馏法分别提取串钱柳叶片和果实中的挥发油,通过气相色谱-质谱联用(GC-MS)对提取得到的挥发油进行化学成分分析,并通过滤纸片扩散法测定了挥发油对7种供试细菌的抑制活性。【结果】串钱柳叶片和果实中挥发油的得率分别为0.87% 和0.16%,从串钱柳叶片和果实中分别鉴定出14和17个成分,分别占二者挥发油总量的93.34%和90.29%。叶片挥发油中的主要成分为桉叶油醇(52.89%)、(1R)-(+)-α-蒎烯(17.28%)和α-松油醇(10.70%); 而果实挥发油的主要成分为桉叶油醇(38.53%)、(1R)-(+)-α-蒎烯(29.90%)和2-莰烯(8.02%); 串钱柳叶片和果实挥发油对7种供试细菌均表现出一定的抑制作用,其中果实挥发油对根癌农杆菌的抑制活性最强,抑菌圈直径为(25.2±2.8)mm,而叶片挥发油对桉树青枯病菌的抑制活性最强,抑菌圈直径为(22.3±1.5)mm。【结论】串钱柳叶片中挥发油的含量高于其果实,叶片和果实挥发油的主要成分均为桉叶油醇和(1R)-(+)-α-蒎烯,果实挥发油的抑菌活性要强于叶片挥发油。     

人参脂肪酸和挥发油成分的GC-MS分析

利用索氏提取法和水蒸气蒸馏法提取人参根中的脂肪酸和挥发油成分,采用气相色谱-质谱(GC-MS)联用技术,分别鉴定了脂肪酸中的19个化合物和挥发油中的46个化合物,运用气相色谱峰面积归一化法确定了它们的相对百分含量,脂肪酸中主要是亚油酸和油酸等不饱和脂肪酸,挥发油中含量较高的是2,2’-亚甲基双[6-(1,1-二甲基乙基)-4-甲基苯酚](10.56%)、1,2-苯二羧酸二异辛酯(6.52%)、7,11-二甲基-3-亚甲基-1,6,10-十二碳三烯(5.45%)和乙酸-13-十四碳烯-1-酯(4.14%).     

白鲜皮挥发油成分GC-MS分析及其潜在活性成分研究

研究分析中药白鲜皮中挥发油类成分组成,探讨其潜在的抗菌活性成分。采用水蒸气蒸馏法提取白鲜皮中挥发油类成分,采用GC-MS联用技术对挥发油类成分进行分离和分析鉴定。从白鲜皮挥发油中分离出36个化学成分,通过质谱数据库鉴定出其中匹配度高于90%的25个成分。相对含量较高的成分是烯类成分(37. 84%)、醇类成分(4. 06%)、芳香醚类成分(2. 25%)和芳香烃类成分(2. 03%)。通过与文献报道比较,不同产地白鲜皮挥发油成分组成存在较大差异,其抗菌活性可能与α-蒎烯、β-蒎烯、茴香脑、麝香草酚甲醚和榄香醇等成分有关。白鲜皮挥发油中化学成分复杂,以烯类成分类成分为主,研究结果为中药白鲜皮的药效物质基础研究与质量控制评价奠定了基础。     

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.     

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.     

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)

正~~     

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.