Genetic analysis for brix weight per stool and its component traits in sugarcane （Saccharum officinarum）     

Liu GF  Zhou HK  Hu H  Zhu ZH  Hayat Y  Xu HM  Yang J 《Journal of Zhejiang University. Science. B》2007,8(12):860-866

Brix weight per stool (BW) of sugarcane is a complex trait, which is the final product of a combination of many components. Diallel cross experiments were conducted during a period of two years for BW and its five component traits, including stalk diameter (SD), stalk length (SL), stalk number (SN), stalk weight (SW), and brix scale (BS) of sugarcane. Phenotypic data of all the six traits were analyzed by mixed linear model and their phenotype variances were portioned into additive (A),dominance (D), additive×environment interaction (AE) and dominance×environment interaction (DE) effects, and the correlations of A, D, AE and DE effects between BW and its components were estimated. Conditional analysis was employed to investigate the contribution of the components traits to the variances of A, D, AE and DE effects of BW. It was observed that the heritabilities of BW were significantly attributed to A, D and DE by 23.9%, 30.9% and 28.5%, respectively. The variance of A effect for BW was significantly affected by SL, SN and BS by 25.3%, 93.7% and 17.4%, respectively. The variances of D and DE effects for BW were also significantly influenced by all the five components by 5.1%～85.5%. These determinants might be helpful in sugarcane breeding and provide valuable information for multiple-trait improvement of BW.  相似文献   

QTL analysis for some quantitative traits in bread wheat     

Pushpendra KG  Harindra SB  Pawan LK  Neeraj K  Ajay K  Reyazul RM  Amita M  Jitendra K 《Journal of Zhejiang University. Science. B》2007,8(11):807-814

Quantitative trait loci (QTL) analysis was conducted in bread wheat for 14 important traits utilizing data from four different mapping populations involving different approaches of QTL analysis. Analysis for grain protein content (GPC) sug- gested that the major part of genetic variation for this trait is due to environmental interactions. In contrast, pre-harvest sprouting tolerance (PHST) was controlled mainly by main effect QTL (M-QTL) with very little genetic variation due to environmental interactions; a major QTL for PHST was detected on chromosome arm 3AL. For grain weight, one QTL each was detected on chromosome arms 1AS, 2BS and 7AS. QTL for 4 growth related traits taken together detected by different methods ranged from 37 to 40; nine QTL that were detected by single-locus as well as two-locus analyses were all M-QTL. Similarly, single-locus and two-locus QTL analyses for seven yield and yield contributing traits in two populations respectively allowed detection of 25 and 50 QTL by composite interval mapping (CIM), 16 and 25 QTL by multiple-trait composite interval mapping (MCIM) and 38 and 37 QTL by two-locus analyses. These studies should prove useful in QTL cloning and wheat improvement through marker aided selection.  相似文献   

关于Hardy-Hilbert不等式的多参数推广     

隆建军 《贵州教育学院学报》2011,(12):6-9

对Hardy-Hilbert不等式进行了研究,并将其进一步改进如下：若p〉1,1/p＋1/q=1,0〈A,B≤1,an,bn≥0,使0〈∑∞n=0apn〈∞,0〈∑∞n=0bqn〈∞,则∑∞m=0∑∞n=0ambn/Am＋Bn＋1〈{∑∞n=0（π/Bsin（π/p）-（3p-B）（ p-1）/6p（2An＋）11/p）anp}1/p{∑∞n=0（π/Asin（π/p）-（3q-A）（q-1）/6q（2Bn＋1）1/q）bnq}1/q.所得结果改进和推广了最近文献的一些相应结果.  相似文献   

参量化的Hilbert型积分不等式     

陈广生 《蒙自师范高等专科学校学报》2011,(2):23-26

通过应用权函数方法和实分析技巧,给出一个推广的具有最佳常数因子的Hilbert型积分不等式.作为应用,考虑了它的等价形式及一些特殊结果.  相似文献   

“理—实”一体化实践教学模式改革与创新——以“瓦斯地质学”国家精品课程建设为例     

吕闰生  张子戌  胡斌 《成都教育学院学报》2011,(4):87-89

＂瓦斯地质学＂课程是培养煤矿瓦斯地质和瓦斯防治人才的重要专业基础课,专业性、实践性都很强,其核心是瓦斯地质应用分析。在阐述瓦斯地质学课程实践教学现状和发展历程的基础上,提出通过理论讲授、分类实践、差异考核,合理构建瓦斯地质学＂理—实＂一体化实践教学模式体系,改革实践教学的内容和方式,强化学生动手实践能力,以培养煤矿地质人才创新意识和创新能力。  相似文献   

医药冷链物流在物联网环境下的动态风险评估     

陈伟炯  王茂馨 《科技管理研究》2020,40(1):215-220

首先运用流程图法分析造成物联网环境下医药冷链物流各环节风险的众多因素源,并运用熵权法对风险指标客观赋权建立风险因素评估指标体系,然后利用Ge NIe软件建立动态贝叶斯网络模型对风险环节的关键风险因素进行概率评估。结果显示在风险评估中运输环节风险的发生概率最高,同时企业关于设备的验证选型是影响物联网医药冷链的关键风险因素,这为企业和政府控制药品质量安全管理提供了依据。  相似文献   

广东省生产力服务体系科技创新服务能力评价模型构建研究     

陈金德  张寒旭  封春生 《科技管理研究》2020,(16)

“十三五时期”,广东省生产力服务体系快速发展,规模逐年壮大,服务内容从传统的中介服务逐步向全链条创新服务转变,发展趋势不断往专业化、网络化、集成化和国际化转变,逐步成为粤港澳大湾区国际科技创新中心和广东科技创新强省建设的重要支撑。为适应广东省生产力服务体系发展的新形势,进一步提升生产力中心系统的科技创新服务能力,亟需建立一套系统、全面的生产力科技创新服务能力评价体系,客观、科学地推进生产力体系的创新发展,作为其动态管理及政策支持的重要依据。因此,本文运用基于熵权法的TOPSIS综合评价方法,构建广东省生产力服务体系科技创新服务能力评价模型,并通过灰色关联分析法验证了评价模型的合理性,确定了关键影响因素。经实证研究发现,2010-2018年间广东省生产力服务体系科技创新服务能力总体呈上升趋势;各区域生产力促进中心发展不均衡,珠三角地区遥遥领先于粤东西北地区;企业服务能力、人力资源、科技创新资源对生产力服务体系科技创新服务能力影响相对显著。  相似文献   

"双一流"背景下基于学科评价的图书馆信息资源优化配置探讨     

冷秋菊  郑建明  胡唐明 《情报探索》2020,(3):30-34

[目的/意义]旨在为高校图书馆优化配置信息资源采购资金提供参考。[方法/过程]依据一流学科评估要求建立学科的评估指标体系,应用熵权法并结合TOPSIS模型得到各学科资金配置权重,根据资金的预算约束条件构建线性规划优化模型,借助MATLAB方法建立资金预算约束条件下信息资源采购资金最优配置方案,并通过仿真算例验证该方案的有效性。[结果/结论]该方案能有效提高信息资源建设资金的投入效益。  相似文献   

基于标记树的XML文档自动分类研究     

潘有能  丁楠 《情报学报》2007,26(3):350-355

本文首先介绍了XML文档和DTD标记树的生成方法,并对标记树中节点的概念进行了扩充,使之不但包括元素,同时也包括连接符,以适应DTD结构的要求。随后将标记树中的元素分为共有元素、文档元素和DTD元素,并提出层次权重和结构权重以衡量元素的层次和结构复杂程度,给出具体计算方法。在此基础上提出了一个衡量XML文档和DTD之间相似度的算法,将其应用于XML文档自动分类中,并给出该算法的时间复杂度计算公式。从实验结果可以看出,该分类方法准确率较高。  相似文献   

服用“康之美”对游泳运动员体脂等的影响     

曹遵雄  余卫东 《体育科研》1996,(4)

“康之美”是一种天然营养片,其主要成分是左旋肉碱,肉碱的主要功能是促进长链脂肪酸转入线粒体内氧化,为人体肌细胞和心肌细胞提供能量,国外已广泛应用于耐力训练和减脂。为了确定其效用,我们挑选了37名优秀游泳运动员,在正常训练条件下补充肉碱,观察他们在服用后体脂的变化情况。实验结果显示,在服用肉碱后,受试者的体脂百分比、六个部位皮褶厚度总和以及体重均明显下降,这证实了左旋肉碱具有促进脂肪酸的β-氧化,帮助燃烧体内多余脂肪,从而达到去脂减重,增进健康,增强运动竞技能力的目的。  相似文献