中微子结构及其结构函数

与研究光子结构类似,若现时中微子ｖ２ｅ,Ｆ（ｑ１,ｇ,ｇ）的超对称性伴子-中性微子Ｕ０ｅ,Ｂ（ｑ２,ｇ－),从亚夸克海中俘获2对色亚夸克ｂｃｂ－ｃ,一对用于使Ｕ０ｅ,Ｂ（ｑ２,ｇ－)构成ｙ－２／３ｅ,Ｂ（ｑ２,ｂ－ｃ)和反轻子-夸克共振态Ｂ＋２／３ｃ（ｂｃ,ｇ－),一对用于将两者粘合在一起的胶子弦,即相当于胶子弦将ｙ－２／３ｅ,Ｂ（ｑ２,ｂ－ｃ）,Ｂ＋２／３ｃ（ｂｃ,ｇ－）粘合在一起的带电谐振子,将显示强作用的特性.但Ｂ＋２／３ｃ（ｂｃ,ｇ－)是反轻子-夸克共振态(ｌ－－ｑ）,其传播子为比Ｗ±１,Ｚ°更重的ε－ｅ（ｑ－１,ｑ２）物质,又给出了它的弱作用性质．以往分析核子结构函数的一些原理和方法可延用于中微子的情形,从而给出了中微子结构函数．     

共同沟安全研究的数值仿真

对于气体泄漏的几种释放量进行了模型试验,数值模拟了在带有燃气管道的共同沟中燃气泄漏后的摩尔组分浓度分布.对比模型试验结果发现：在气体泄漏点的一定范围内,标准κ－ε湍流计算模型能够模拟燃气的泄漏,数值计算的燃气浓度能够满足工程精度要求,工程中的三维湍流问题可以进行数值仿真.     

调制型数字滤波器组的设计及实现方法

探讨满足精确重建条件的调制型数字滤波器组,提出了这种调制型数字滤波器组的设计及实现方法,计算机仿真实验证明该方法是简单和有效的.     

Construction of a genetic map and location of quantitative trait loci for dwarf trait in maize by RFLP markers

Using F₂ population derived from the cross of tall inbred 7922 by dwarf inbred 5003, an RFLP linkage map of maize has been constructed, on which 85 markers are distributed among 10 linkage groups and span maize genome about 1827.8 cM with an average distance (24.4 cM) between markers. 106 F_2:3 lines of the population were grown in a 10 × 11 simple rectangular lattice design of one-raw plots with two replications and evaluated for plant height (PH). With interval mapping procedure, 5 QTLs controlling plant height have been identified and their genetic effects and gene action determined. 2 major QTLs with opposite effect have been discovered. One for increasing plant height isph1 which is located at chromosome 2 and accounts for 51.8% of the total phenotypic variation; the other for decreasing plant height isph3 which is located at chromosome 5 and accounts for 38.6% of the total phenotypic variation. The chromosomal location ofph3 might be the same as or close to the position ofbv1, a dwarf mutant of maize.     

荷木种群在不同群落中的分子生态研究

用扩增片段长度多态性（ＡＦＬＰ,ａｍｐｌｉｆｉｅｄ ｆｒａｇｍｅｎｔ ｌｅｎｇｔｈ ｐｏｌｙｍｏｒｐｈｉｓｍ）方法对荷木（Ｓｃｈｉｍａ ｓｕｐｅｒｂａ）在３个不同群落中的遗传变异进行了研究。ＡＦＬＰ分析结果表明其遗传多样性较高。用ＡＭＯＶＡ（ａｎａｌｙｓｉｓ ｏｆ ｍｏｌｅｃｕｌａｒ ｖａｒｉａｎｃｅ）分析表明,９５．９９％的遗传变化表现在种群内,４．０１％的遗传分化表现在种群间（Ｐ〈０．００１）     

斜π－Armendariz环

 对于环R的自同态α,引入了α－π－Armendariz环这一概念,给出了例子,并对这一类环的扩张进行了研究。     

黄姑鱼♀与大黄鱼♂杂交试验与AFLP分析

开展了黄姑鱼♀与大黄鱼♂杂交试验,并对杂交F1初孵仔鱼进行了AFLP分析.黄姑鱼♀与大黄鱼♂杂交能够正常受精,杂交受精率为93.54%,受精卵正常发育、孵化,孵化率为86.23%,但仔鱼在开口后一周内全部死亡.利用8对选择性扩增引物组合对亲本和杂交后代（家系）初孵仔鱼进行AFLP分析,共得到456个条带,其中母本特异条带（Female Special Band,FSB）178条、父本特异条带（Male Special Band,MSB）187条、双亲共有条带（Mutual Band,MuB）91条.且其中84条（47.2%）FSB、89条（47.6%）MSB和75条（82.4%）MuB为全部杂交仔鱼共有,其余94条（52.8%）FSB、98条（52.4%）MSB和16条（17.6%）MuB在杂交后代中发生了分离.分离的FSB和MSB中分别有33.0%和28.6%表现为偏分离.AFLP分析结果表明,黄姑鱼♀与大黄鱼♂杂交的初孵仔鱼含有双亲的条带,是真正的杂交种,是构建大黄鱼与黄姑鱼遗传图谱以及研究杂种在细胞和分子水平隔离机制的适合材料.     

AFLP分子标记技术及其应用研究进展

AFLP是新近发展起来的一种DNA指纹技术，该方法重复性好、特异性高、能反映生物基因组的细微变化，在生物遗传多样性研究、品系分析、高密度遗传图谱的构建、微生物分型与鉴定、生态位变化、抗性育种、动物近交系选 育、疾病诊断等方面应用广泛。本简述了AFLP分子标记的基本大批量、方法与特点以及在动植物、微生物、生态群落等方面研究中的应用和发展前景。     

Molecular identification of asymmetric somatic hybrids between wheat and Italian ryegrass

Sexual incompatibility between common wheat and Italian ryegrass was an obstacle for transferring useful traits from italian ryegrass to wheat. In order to use those desirable genetic resources to improve wheat and to create new cytoplasmic germplasm, the protoplasts of wheat and Italian ryegrass were successfully electrofused and the somatic hybrid plants were regenerated. Examination with 6 restriction enzymes, 13 probes including 9 mtDNA probes (H454, Pst24, B30, Pro I, 490, B342, pHJ2-7-1, B376, 7), 3 cpDNA probes (pHvc p1, pHvc p5 and pHvc p8) and one nuclear DNA probe-- pTA71 (rDNA) in total 73 enzyme/ probe combinations revealed rich polymorphism between the fusion partners. RFLP analysis indicated that approximately 93.4% of the regenerated plants were true somatic hybrids. AFLP analysis implied that the somatic hybrids were highly asymmetric. The RFLP analysis using mt- and cpDNA specific probes also demonstrated the non-coexistence of mitochondria and chloroplasts from the fusion partners in the somatic hybrid cells.     

普通小麦Brock中一个抗白粉病新基因AFLP标记P13/M13250的筛选

用225对AFLP引物组合，对白粉病敏感小麦品种京411，抗病品种Brock和以京411为轮回亲本、Brock为抗源供体育成的近等基因系（NILs）进行分子标记筛选，其中，引物组合P13／M13能在抗、感材料间稳定产生P13／M13-250bp的多态性片段．用Brock与京411杂交R代抗、感分离单株，对P13／M13 250进行了初步连锁性鉴定，该标记对小麦植物抗病育种分子标记辅助选择有一定用处．