大豆异黄酮对大鼠的心肌电生理效应

目的探讨大豆异黄酮对大鼠的心肌电生理效应.方法采用微电极电生理技术观察大豆异黄酮对麻醉大鼠心肌电生理效应.结果大豆异黄酮可缩短大鼠心肌动作电位复极化50%的时间(APD50,P<0.001)及复极化90%的时间(APD90,P<0.01).结论大豆异黄酮可缩短心肌动作电位时程,其机制可能与阻滞钙通道有关.     

对传统大豆制品中大豆异黄酮生理活性的评价

阐述了近年对大豆异黄酮生理活性的研究进展,通过分析一些文章报道的豆制品中大豆异黄酮的含量及组成来评价传统豆制品中大豆异黄酮的生理活性,确认发酵及酶工程的应用有利于提高豆制品中大豆异黄酮的生理活性.     

大豆异黄酮增强大鼠骨密度作用的研究

大豆异黄酮(soybean isoflavone)是新型天然生理活性物质，具有多种生理功能．研究表明：连续饲喂大鼠90天，实验组股骨的长度、重量、骺端骨密度、中点骨密度均显著大于对照组，说明大豆异黄酮具有增强骨密度的作用．     

大豆异黄酮对皮肤保水活性的研究

大豆异黄酮是新型天然生理活性物质,具有多种生理功能。研究表明:连续食用30天,皮肤水分在试验后得到改善,实验组与对照组比较具有显著性差异,说明大豆异黄酮具有保持皮肤水份的作用。实验组和对照组人员试食后血常规和血生化指标均无明显改变,无过敏及不良反应。     

大豆异黄酮对人体生理生化有益功能

简要介绍了大豆异黄酮对人体生理生化有益功能。经病因学调查、动物和人体实验研究表明具有缓解更年期综合症、预防骨质疏松症、抗肿瘤预防癌症、对心脑血管疾病、增强免疫功能抗氧化作用具有一定的预防效果     

大豆异黄酮对小鼠脑组织中胆碱酯酶和氨基酸类神经递质及记忆的影响

采用不同剂量的大豆异黄酮饲喂小鼠,观测大豆异黄酮对小鼠记忆功能、脑组织中氨基酸类神经递质含量、脑组织与血液中胆碱酯酶活性的影响.结果表明,实验所用的三个剂量(30、60、120 m g/kg.bw)的大豆异黄酮对小鼠的记忆能力均有不同程度的提高;大豆异黄酮使小鼠血液和海马中胆碱酯酶(AChE)活性以及大脑皮质与海马组织中甘氨酸(G ly)含量降低,而大脑皮质与海马组织中天冬氨酸(A sp)和谷氨酸(G lu)含量升高.此结果提示,大豆异黄酮具有调节脑组织中氨基酸类神经递质和胆碱酯酶代谢的作用,这可能与大豆异黄酮调节记忆功能有关.     

大豆副产物中生物活性物质的生理保健功能

本文对大豆副产物中的大豆多肽、大豆低聚糖、大豆异黄酮、大豆皂甙、大豆膳食纤维等活性成分与生理功能作了较系统地阐述。     

黄浆水中功能性成分研究及利用现状

黄浆水是加工豆腐和大豆分离蛋白产生的副产物,其中含有很多生物活性成分,如大豆乳清蛋白、大豆低聚糖、大豆异黄酮等.这些物质具有抗癌、降血压、增强免疫力、防止便秘、预防骨质疏松症,预防心血管疾病等作用.此外,黄浆水极易腐败变质,化学需氧量(COD)、生物需氧量(BOD)值非常高,直接排放不仅造成生物活性成分的大量损失,而且对环境造成极大的污染.综述了黄浆水中大豆乳清蛋白、大豆低聚糖和大豆异黄酮的性质,回收方式及利用方面的研究进展,旨在为黄浆水中功能性成分的回收及利用提供一定参考.     

大豆异黄酮生理功能的研究进展

异黄酮是一种来源于大豆的植物雌激素。本文论述大豆异黄酮生理功能研究进展,并介绍了高染料木苷大豆异黄酮的开发与抗肿瘤活性。     

大豆异黄酮的功能及其保健应用

近年发现大豆胚芽里含有一类大豆异黄酮物质,具有类似雌激素作用,能预防骨质疏松症的发生、抵御癌症、减轻妇女更年期紊乱症状、降低老年痴呆症的风险,以及用作化妆品的组份等,已引起当今世界性关注。     

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).     

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.     

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.