青葙根水提物化感活性及抑菌活性的研究

以水稻(Oryza sativa L.)等5种植物和油菜菌核病(Sclerotinia sclerotiovum(Lib)de Bary)等4种植物病原病菌为受试材料,通过生物测定的方法研究了青葙(Celosia argenteas Linn.)根水提物化感活性及抑菌活性。结果表明,与对照相比,在250～4 000μg/mL浓度范围内,提取物对稗草(Echinochloa crusgalli(L.)Beauv.)和醴肠(Eclipta prostrate L.)种子的萌发,水稻和稗草幼苗苗高,烟草(Nicotiana tabacum L.)和醴肠幼苗的单株鲜重不产生显著影响,而在相同的浓度范围内,对千金子(Leptochloa chinensis(Linn.)Nees)幼苗的根长和单株鲜重产生显著抑制作用。对5种植物相对应的其它生长特性方面,只有在高于250μg/mL浓度时才能受到显著抑制。在25～400μg/mL的浓度范围内,提取物对油菜菌核病、小麦赤霉病(Fusarium graminearum Schw.)和杨树溃疡病(Dothiorella gregaria Sacc.)病菌的生长产生显著抑制作用,当浓度达到50μg/mL时,提取物也显著抑制烟草灰霉病(Botrytis cinerea Pers.)病菌的生长,400μg/mL时,对4种植物病原真菌的抑制率分别为45.90%、46.49%、45.64%和41.66%。上述表明,青葙根水提物具有开发为生物源农药的潜力。     

不同诱导子对曼地亚红豆杉内生真菌产紫杉醇的影响

从曼地亚红豆杉树皮中分离得到1株链格孢属(Alternaria sp.)内生真菌MF5。初期马铃薯葡萄糖(PD)培养基液体培养结果显示,MF5的发酵产物中检测到的紫杉醇质量浓度约为0.58 mg/L。为了提高MF5发酵产物中紫杉醇含量,考察添加CuSO_4、茉莉酸甲酯(MeJA)、赤霉素(GA_3)和红豆杉浸出液对MF5产紫杉醇的影响。结果表明:添加4%红豆杉浸出液,对MF5进行发酵培养,发酵产物中紫杉醇质量浓度为(2.47±0.07) mg/L;在此基础上,添加CuSO_4、MeJA、GA_3 3种诱导子也能够提高MF5产紫杉醇的能力,且同时添加3种诱导子时,MF5发酵物中紫杉醇含量最高,达到(12.58±0.80) mg/L。本研究证实了3种诱导子和红豆杉浸出液均可促进内生真菌代谢产生紫杉醇,为后续真菌发酵法生产紫杉醇打下基础。     

红树林细菌发酵产灵菌红素条件研究

采用单因素试验和L9(34)正交试验研究从红树林中分离到的一株具有产灵菌红素的海洋细菌(Flavobacterium sp.)的发酵条件。结果表明,最佳培养基配方为麦芽糖10.0g/L,蛋白胨10.0g/L,磷酸氢二钾0.25g/L,硫酸镁0.1g/L,最合适pH值为6.0,最合适的盐度为10‰,最合适的温度为27℃。     

紫杉醇对体外大鼠肝细胞影响的实验研究

目的:在通过观察紫杉醇对体外培养大鼠肝细胞的影响来探讨紫杉醇自身毒副作用.方法:采用四唑盐(MTT)比色法及形态学方法观察紫杉醇在不同质量浓度下作用不同时间对肝细胞的影响;采用Hoechst 33258荧光染色法观察紫杉醇作用后,肝细胞的形态变化.结果:质量浓度分别为5、10、20、40、80μg/L的紫杉醇分别作用24、48、72 h后,随着质量浓度的增加、作用时间的延长对体外培养的肝细胞损伤加大、抑制率增加;相同质量浓度的紫杉醇不同作用时间的抑制率无时间效应关系;24 h的IC50质量浓度为28.5μg/L,并能诱导肝细胞发生凋亡.结论:紫杉醇在一定的质量浓度和长时间作用下对肝细胞有细胞毒作用.     

紫杉醇产生菌的筛选与发酵条件的调控

采用稀释倒平板法分别从云南红豆杉和南方红豆杉中分离出230余株内生真菌,经薄层层析、紫外及HPLC分析初步筛选,确定有5株表现出产紫杉醇的特性,其中1株真菌产率较高,约为1 mg/L.产紫杉醇的内生真菌菌丝体生长和紫杉醇积累之间存在相反的关系.低浓度乙酸铵(＜0.01 mmol/L)有利于菌丝体生长,不利于紫杉醇积累;较高浓度的乙酸铵不利于菌丝体生长而有利于紫杉醇积累.较高浓度的苯丙氨酸和酒石酸铵(＞0.05 mmol/L)有利于菌丝体生长,不利于紫杉醇积累;较低浓度的苯丙氨酸和酒石酸铵不利于菌丝体生长而有利于紫杉醇积累.亮氨酸对菌丝体生长和紫杉醇积累的影响很小;苯甲酸钠抑制菌丝体的生长和紫杉醇的积累.     

红豆杉细胞聚集体悬浮培养生产紫杉醇

建立了中国红豆杉(Taxuschinensis)细胞聚集体两步法悬浮培养生产紫杉醇的培养体系.红豆杉细胞于含LH1g/L,NAA0.1mg/L,2,4-D0.5mg/L及6-BA0.8mg/L的细胞聚集体形成的培养基中生长并形成聚集体,10d后转入生产培养,较大细胞聚集体的生物量比和紫杉醇产量分别较对照组提高了53.7%和82.1%;提高细胞聚集体的生物量比能显著增加紫杉醇产量.四种基本培养基中B5最适合诱导细胞聚集体的形成.生长培养12d后细胞悬浮培养物按1∶1(体积比)直接转入生产培养对细胞生长、细胞聚集体和紫杉醇形成最有利.在100μmol/L茉莉酸甲酯作为诱导子下本体系紫杉醇产量较对照组提高了一倍.     

青葙根水提物化感活性及抑菌活性的研究

以水稻(Oryza sativa L.)等5种植物和油菜菌核病(Sclerotinia sclerotiovum (Lib) de Bary)等4种植物病原病菌为受试材料,通过生物测定的方法研究了青葙(Celosia argenteas Linn.)根水提物化感活性及抑菌活性.结果 表明,与对照相比,在250～400μg/mL浓度范围内,提取物对稗草(Echinochloa crusgalli (L.) Beauv.)和醴肠(Eclipta prostrate L.)种子的萌发,水稻和稗草幼苗苗高,烟草(Nicotiana tabacum L.)和醴肠幼苗的单株鲜重不产生显著影响,而在相同的浓度范围内,对千金子(Leptochloa chinensis (Linn.)Nees)幼苗的根长和单株鲜重产生显著抑制作用.对5种植物相对应的其它生长特性方面,只有在高于250 μg/mL浓度时才能受到显著抑制.在25～400 μg/mL的浓度范围内,提取物对油菜菌核病、小麦赤霉病(Fusarium grarninearum Schw.)和杨树溃疡病(Dothiorella gregaria Sacc.)病菌的生长产生显著抑制作用,当浓度达到50 μg/mL时,提取物也显著抑制烟草灰霉病(Botrytis cinema Pets.)病菌的生长,400μg/mL时,对4种植物病原真菌的抑制率分别为45.90%、46.49%、45.64%和41.66%.上述表明,青葙根水提物具有开发为生物源农药的潜力.     

几种胁迫因素对中国红豆杉细胞培养的影响

中国红豆杉细胞培养过程中,在第10d添加0．6mg/mL的真菌F5提取物可使紫杉醇的合成量达300μg/g干重细胞;在培养第20d添加20mg/LAg^ ,紫杉醇的合成量达83μg/g干重细胞;在培养第20d添加4mg/Cu^2 ,紫杉醇的合成量达35μg/g干重细胞。     

硒矿区土壤中真菌的分离培养及抗肿瘤活性筛选

利用单菌落挑选与划线培养技术,从硒矿区土壤样品中分离纯化真菌。通过摇床发酵培养,提取制备发酵样品。采用MTT法,用MDA-MB-231细胞、Hela细胞、SMMC-7721细胞测试发酵样品的抗肿瘤活性。从采自湖北恩施全球唯一独立硒矿床区的6个不同土样中分离真菌73株。其中,对人宫颈癌Hela细胞的IC_(50)小于90μg/m L的菌株32株,对人乳腺癌MDA-MB-231细胞的IC_(50)小于90μg/m L的菌株13株,对人肝癌SMMC-7721细胞的IC_(50)小于90μg/m L的菌株9株。这些活性菌株为筛选抗肿瘤天然产物提供了良好的药源菌株。     

几种胁迫因素对中国红豆杉细胞培养的影响

中国红豆杉细胞培养过程中 ,在第 10d添加 0 .6mg/mL的真菌F5提取物可使紫杉醇的合成量达 30 0μg/ g干重细胞 ;在培养第 2 0d添加 2 0mg/LAg+ ,紫杉醇的合成量达 83μg/ g干重细胞 ;在培养第 2 0d添加 4mg/LCu2 + ,紫杉醇的合成量达 35 μg/ g干重细胞     

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.