几种化学药剂对菜蚜的活性研究

测定了啶虫脒、莫比朗、吡虫啉和乐果对菜缢管蚜、桃蚜成虫的毒力,进行了室内药效试验和小区防效试验。结果表明：啶虫脒和莫比朗对桃蚜、采缢管蚜的ＬＣ５０最低,乐果的ＬＣ５０最高,吡虫啉介于前二者与后者之间;啶米和莫比朗的室内防桃蚜了,其次是吡虫啉;啶虫脒、莫比朗和吡虫啉室内防菜缢管蚜均大于９０％,三者间无显著差异;啶虫脒、莫比朗和吡虫啉的田间防效结果差异不大,施药后７ｄ的防效均大９０％以上。     

十字花科蔬菜蚜虫田间种群对药剂的敏感性

采用浸叶法,测定了昆明地区十字花科蔬菜3种蚜虫田间种群对8种杀虫剂的敏感性.结果表明,这3种蚜虫种群对苦参碱、除虫菊素、印楝素、啶虫脒、吡虫啉、氯氰菊酯、敌敌畏、乙酰甲胺磷的敏感性差异明显.其中,这3种蚜虫对乙酰甲胺磷高度不敏感,其对甘蓝蚜、萝卜蚜和桃蚜的LC50值分别为4868.68,2440.53和6379.34 mg/L;这3种蚜虫对敌敌畏也不敏感,其对甘蓝蚜、萝卜蚜和桃蚜的LC50值分别为259.76,95.24和567.59 mg/L;3种蚜虫对其它6种药剂的敏感性也存在差异,但相对较为敏感.     

反相高效液相色谱法测定附子有效成分含量的方法研究

运用RP-HPLC测定不同地区附子药材中3种酯型生物碱———新乌头碱、乌头碱和次乌头碱的含量.实验以RP-C18色谱柱为固定相,乙腈-0.1%的乙二胺水溶液为流动相进行梯度洗脱.梯度洗脱程序:乙腈和0.1%的乙二胺水溶液的比率0~17 min为46∶54,17~37 min为82∶18;37~50 min为46∶54,流速为1.0mL/min;紫外检测波长为230 nm.新乌头碱、乌头碱和次乌头碱的标准曲线范围分别是5.62×10-6~5.062×10-5mol/L、2.614×10-6~2.614×10     

关于吡虫啉对玉米田蝗虫群落毒力的研究

研究了吡虫啉对玉米田蝗虫杀伤毒力与群落结构的影响，结果表明玉米田有9种蝗虫，其中优势种为花胫纹蝗（Ajlopus thalasisinus tamulus(Fabr.）和黄胫小车蝗（Oedaleus infernalis Sauss），室内毒力试验，在田间使用浓度下，用药膜法和喷雾法测定了吡虫啉对两优秀种蝗虫的击倒作用，计算了KT50；以点滴法测得其他两优势种蝗虫的触杀作用LD50为39.5和27.3μg/头；浸叶法测得其胃毒作用LD50为35.0和14.1μg/L。田间试验喷药后10d防效均可在50%以上，同时喷药前后田间蝗虫群落结构也发生着明显的变化。     

球孢白僵菌对七种蚜虫的感染反应——时间-剂量-死亡率模型分析

通过以球孢白僵菌(Beauveria bassiana)菌株SGBB8601系列浓度的分生孢子悬液(10~4～10~8孢子/mL)对俄罗斯麦双尾蚜(Diuraphis noxia)、麦无网长管蚜(Metopolophium dirhodum)、麦长管蚜(Sitobion avenae)、麦二叉蚜(Schizaphis graminum)、玉米蚜(Rhopalosiphum maidis)、禾谷缢管蚜(R padi)和忽布疣额蚜(Phorodon humuli)等七种蚜虫的体表接种试验,运用时间-剂量-死亡率模型分析了该菌株作用于上述寄主的剂量、时间及其互作效应。所测菌株对所有蚜虫均具有毒力,接种后七日的LD_(50)为1.25×10~5～114.82×10~5孢子/mL,毒力因蚜种而异,双尾蚜和忽布疣额蚜最为敏感,玉米蚜与禾谷缢管蚜的敏感性相对较低,其余居间。这些结果表明所试菌株具有作为蚜虫微生物防治候选因子的潜势。本研究采用的分析方法较传统的Probit或Logit分析方法有显著的优越性,将时间和剂量效应的分析统一到一个模型中,使时间与剂量效应的互作评价成为可能。笔者介绍了该模型的生物学基础和建模步骤,并讨论了在生物学研究领域的应用前景。     

3种杀虫剂对葡萄斑叶蝉的毒力测定及田间药效试验

分别采用叶片浸叶法、喷雾法测定3种不同杀虫剂对葡萄斑叶蝉的毒力测定和田间药效。毒力测定表明:10%吡虫啉可湿性粉剂、25%阿克泰水分散粒剂和48%乐斯本乳油对葡萄斑叶蝉LC50分别是45.870、18.131、3.757μg·m L~(-1);田间试验表明:10%吡虫啉可湿性粉剂、25%阿克泰水分散粒剂和48%乐斯本乳油药后7 d防效均为100%,说明该3种药剂都具有很好的防效,且前两种杀虫剂药后持效期长,所以推荐10%吡虫啉可湿性粉剂、25%阿克泰水分散粒剂为防治葡萄斑叶蝉的最佳药剂。     

8种有机溶剂对肿瘤细胞的细胞毒作用

实验中常需要有机溶剂溶解水溶性较差的待筛选样品,笔者为抗肿瘤药物体外筛选时选择适宜体积分数下低毒且溶解性能好的有机溶剂作参考.用改良MTT法测试8种常用溶剂对2种人肿瘤细胞株生长的影响.甲醇、乙酸乙酯、乙醇、乙二醇、二甲基亚砜(DMSO)、氯仿、丙酮和正丁醇对人肺癌细胞株A549的IC50分别为3.50,0.61,2.09×10-2,3.79×10-2,4.07×10-3,2.10×10-2,4.04×10-3,2.62×10-4?μg/mL;甲醇、乙酸乙酯、乙二醇、二甲基亚砜、氯仿、丙酮和正丁醇对人肝癌细胞株BeL-7402的IC50分别为0.28,0.89,5.82×10-2,9.67×10-3,5.54×10-2,8.00×10-3,1.61×10-3?μg/mL.结果说明体积分数为0～10%的甲醇和乙酸乙酯细胞毒性甚微,宜选用;乙醇、乙二醇选用低于3%的体积分数;DMSO宜用低于1%的体积分数;丙酮和氯仿宜选择低于0.3%的体积分数;正丁醇的细胞毒性较强,不适合用于筛药中.     

毛细管电泳电化学检测葛根和葛藤中几种黄酮类化合物

用毛细管电泳电化学检测法测定了葛根和葛藤中葛根素、大豆甙元和芦丁含量.以碳圆盘电极为检测电极,电极电位为0.90V(vs.SCE),在50mmol/L硼酸盐缓冲液(pH9.0)中,使用长40cm熔融石英毛细管,当分离电压为9kV,上述三组分在12min内完全分离.葛根素、大豆甙元和芦丁浓度与电泳峰电流分别在2.5×10-6～1.0×10-3,1.0×10-6～1.0×10-3和5.0×10-6～1.0×10-3mol/L范围内呈良好线性,检出限(S/N=3)分别为3.4×10-7,2.4×10-7和5.1×10-7mol/L.7次测定葛根素、大豆甙元和芦丁的混合标准溶液,峰高的相对标准偏差分别为2.71%,2.47%和4.21%.     

苦豆子7种生物碱对椰心叶甲的生物活性

室内测定了苦豆子7种生物碱对椰心叶甲3龄幼虫的拒食及毒杀作用,结果表明:苦豆子7种生物碱对椰心叶甲3龄幼虫均具有明显的拒食作用,其中以苦豆碱的活性最高,处理后24 h和48 h的拒食率分别为90.35%和93.27%(1 mg/mL)。毒杀试验显示野靛碱和苦豆碱的毒杀作用要优于其他生物碱,处理后第9天的校正死亡率均达到100%。此外,苦豆子7种生物碱对椰心叶甲还有一定的杀卵作用,野靛碱和苦豆碱在处理后第5天的卵孵化率均小于12%(2 mg/mL)。     

反相流动注射化学发光法测定盐酸小檗碱

基于盐酸小檗碱抑制磷钼钒杂多酸氧化鲁米诺产生化学发光,结合流动注射分析技术,提出了一种测定盐酸小檗碱的新方法.盐酸小檗碱在1.0×10-7～1.0×10-4 g/mL浓度范围内与化学发光分析信号呈线性关系;检出限为4×10-8 g/mL;对5.0×10-6 g/mL的盐酸小檗碱进行11次连续测定,相对标准偏差为1.2%.该方法已成功地应用于盐酸黄连素片剂中盐酸小檗碱的测定.     

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.