霍山灌木植物群落的数量分类

本文选择霍山坡51个样方44个种用东坡54个样方40个种的重要值经中心化处理的数据为属性参数,采用欧氏距离系数定义样方实体间的距离,用类平均法将西坡51个样方划为15个群系,东坡54个样方划为12个群系。并就类平均法的可行性加以讨论。     

Immunogenicity of fatty acid anilides in rabbits and the pathogenesis of the Spanish toxic oil syndrome

Summary Fatty acid anilides, the major xenobiotic found in the cooking oils responsible for the Spanish toxic oil syndrome, are immunogenic for rabbits as ascertained by a skin test reaction, the characterization of specific antibodies against anilides and the immunofluorescent detection of anilide dependent antigens in tissue slices from treated animals.Acknowledgments. This work was supported by a grant from the Fondo de Investigaciones Sanitarias to the C.S.I.C. Programme on Toxic Oil Syndrome. We are indebted to Dr M. Studt and Dr E. Fernández-Alvarez, from the National Center for Organic Chemistry, C.S.I.C., for kindly providing the synthetic fatty acid anilides. We also wish to thank Prof. C. Gitler for helpful discussion.     

定罪量刑系统DZLX中不确定性知识的表示和处理

文章首先概述了国内外不确定性知识的处理方法,又通过分析刑法适用中的不确定性问题,介绍了我们开发的“定罪量刑参考系统”DZLX中不确定性知识的表达,推理和求解的方法,由此提出了在不确定性知识处理领域中带有普遍意义的原则,并且对不确定性知识学习方法的机器实现作了探索。     

Conditional and unconditional mapping of quantitative trait loci underlying plant height and tiller number in rice (Oryza sativa L.) grown at two nitrogen levels

In this study,we used 127 double haploid (DH) lines to analyze agricultural traits of rice.The DH lines,derived from a ZYQ8 (indica)/JX17 (japonica) cross by anther culture,contained 160 RFLP and 83 SSR markers.Unconditional and conditional quantitative trait loci (QTL) mapping was conducted to analyze plant height (PH) and tillers per plant (TP) at five growth stages that were grown at two nitrogen levels.Fourteen PH and 13 TP unconditional QTL were identified in the different growth stages,including 19 QTL from high-nitrogen (HN) and 14 QTL from low-nitrogen (LN) conditions.The conditional QTL for 14 genomic regions under LN/HN con-ditions showed that there was a significant effect on PH and TP across the different stages.Only one conditional QTL,ph2-3,was unable to be detected in unconditional mapping.More QTL were detected in the first four rice growth stages than in the final stage.Further-more,a line from the DH mapping population,DH78,was identified in extreme phenotypes of PH and TP that exhibited dwarfism and less-tiller (dft) characters.The gene dftl was mapped to chromosome 2 using a backcrossed population of DH78/JX17 through a map-based cloning strategy.The location of dftl coincided with the mapping region of the small-LOD peak,QTL ph2 and tp2,which were identified in plants grown in low-nitrogen conditions.Further backcrossing and fine-mapping successfully delimited the dftl locus to a 91 kb region.     

银杏酸的定量分析方法研究

采用反相高效液相色谱法测定银杏酸,分析了流动相组成,pH值对银杏酸色谱保留行为的影响。结果表明,在确定的分离条件下,此方法可应用于银杏制剂中银杏酸含量测定,同时初步建立了一种由GBE中提取分离银杏酸的大孔树脂吸附法.     

QTL analysis of flag leaf in barley （Hordeum vulgate L.） for morphological traits and chlorophyll content

To understand genetic patterns of the morphological and physiological traits in flag leaf of barley, a double haploid （DH） population derived from the parents Yerong and Franklin was used to determine quantitative trait loci （QTL） controlling length, width, length/width, and chlorophyll content of flag leaves. A total of 9 QTLs showing significantly additive effect were detected in 8 intervals on 5 chromosomes. The variation of individual QTL ranged from 1.9% to 20.2%. For chlorophyll content expressed as SPAD value, 4 QTLs were identified on chromosomes 2H, 3H and 6H; for leaf length and width, 2 QTLs located on chromosomes 5H and 7H, and 2 QTLs located on chromosome 5H were detected; and for length/width, I QTL was detected on chromosome 7H. The identification of these QTLs associated with the properties of flag leaf is useful for barley improvement in breeding programs.     

我国离岸金融市场创建条件的量化分析

采用ＩＳＭ方法确定建设离岸金融的评价指标体系。在此基础上，运用ＡＨＰ方法和模糊评价方法，就我国创建离岸金融的条件作了定量分析与评价。     

太子参总皂苷的含量测定方法研究

建立了太子参总皂苷含量的测定方法．以人参皂苷Re为对照品,5％（W／V）香草醛冰醋酸溶液和60％（V/V）硫酸溶液为显色剂,60℃恒温反应20min,分光光度法测定太子参总皂苷的含量．最大吸收波长535nm,在3．88—34．96mg／L范围内浓度与吸光度线性关系良好,相关系数r=0．9983.方法回收率在96％-105%之间．测定了不同提纯方法得到的太子参总皂苷含量,结果表明方法简便,重现性好,可作为太子参总皂苷的质量控制方法．     

The structure and functions of the presenilins

The presenilins (PSs) were new proteins discovered in 1995 to be involved, among other functions, in the molecular mechanisms leading to Alzheimers disease. These proteins have been the subject of many investigations since then to elucidate their molecular structures and functions. Until now, the conclusions about PS structure have been discordant, but the 8-TM structure has been accepted by the Alzheimers community, with the evidence for the 7-TM structure largely ignored. Here the evidence is reviewed for the 6-TM, 7-TM, 8-TM and other proposed models of PS topography and possibilities offered for the differences in interpretation of the various sets of data. The conclusion is that at this stage, the 7-TM model for cell surface PS is most likely the correct one.Received 22 December 2004; accepted 26 January 2005     

浅议国外汽车品牌的命名及汉译

随着汽车市场的迅速发展，越来越多的国外汽车品牌进入人们视野。本文采用文本研究与定量分析相结合的方式对国外汽车品牌的命名及汉译进行研究，并由此归纳出四条汽车产品命名和翻译应遵循的规律。对国外汽车品牌命名和翻译的研究，对于本国同类产品出口销售时面临的名称翻译问题也是有所启发的。