动力输出湿式多片式离合制动器的开发及应用

为了满足配套机具的响应及时性和操纵安全舒适性,在拖拉机动力输出（PTO）湿式多片式离合器基础上,研发出针对动力源结合或分离同时制动的湿式多片式离合制动器,通过液压阀块及蓄能泵作为控制组件,采用电控按钮操纵,相比传统意义上的湿式多片式离合器,更具备分离同时制动的功能。     

Construction of Genetic Linkage Map of Bread Wheat （Triticum aestivum L.） Using an Intervarietal Cross and QTL Map for Spike Related Traits

Most often a genetic linkage map is prepared using populations obtained from two highly diverse genotypes. However, the markers from such a map may not be useful in a breeding program as these markers may not be polymorphic among the varieties used in breeding. For the past nine years, intraspecific maps have been gaining importance and such maps based on Swiss （PaiUard et al., 2003）, Japanese （Suenaga et al., 2005）, Australian （Chaimcrs et al., 2001） wheat varieties arc available. A map based on Indian wheat varieties however has not been reported. We constructed a genetic linkage map based on a cross between two Indian bread wheat （Triticum aestivum L.） varieties, Sonalika and Kalyansona. One hundred and fifty F2 individuals were analyzed for arbitrarilyprimed polymerase Chain reaction （AP-PCR）, random amplified polymorphic DNA （RAPD）, inter simple sequence repeats （ISSR）, Sequence Tagged Microsatelhte Sites （STMS）, Amplified Fragment Length Polymorphism （AFLP） markers, seed storage proteins and known genes. A linkage map was constructed consisting of 236 markers and spanning a distance of 3 639 cM with 1 211.2 cM for A genome, 1 669.2 cM for B genome, 192.4 cM for D genome and 566.2 cM for unassigned groups,     

某汽车转向纵拉杆设计分析

转向纵拉杆是汽车转向传动机构中重要的零部件,通过转向纵拉杆受力分析,对转向纵拉杆的强度、稳定性进行了校核,提供了纵拉杆设计分析的参考.     

核果类果树遗传连锁图谱的研究进展

遗传连锁图谱构建是基因组研究中的重要环节,是基因定位与克隆乃至基因组结构与功能研究的基础。近20a来,分子生物学特别是分子标记技术的飞速发展为高饱和核果类遗传连锁图谱的构建和利用奠定了基础。目前国内外已经公布十几张核果类的遗传连锁图谱,但这些图谱均有不同的缺陷。因此,我们就核果类遗传连锁图谱的构建进展、性状的QTL定位及比较图谱应用进行了综述,并探讨了核果类遗传连锁图谱研究的前景和存在的问题。     

基于元数据仓储与动态链接的图书馆资源整合系统的整合与实现

研究了对资源整合的方法, 设计与实现了一种基于元数据仓储与动态链接的资源整合系统。采用OpenURL技术解决了网络数据库之间相互链接的问题。采用元数据仓储,通过元数据收集、整理、聚合、存储,建立了各种分类体系,构建了资源导航、高级检索、个性化服务、用户权限管理等功能,使用户能够在统一的界面上,实现对图书馆资源的统一检索、浏览和利用。     

兴安落叶松优良种源遗传结构的研究(Ⅰ)——MDH和GOT同工酶位点的连锁遗传关系

以兴安落叶松４个种源区的种子为材料，采用同工酶分析的方法，对ＭＤＨ和ＧＯＴ同工酶进行了遗传分析。其结果表明，兴安落叶松ＭＤＨ和ＧＯＴ同工酶均受４个基因位点控制；各位点等位基因分离比例均符合孟德尔规律；ＧＯＴ—１和ＧＯＴ—２、ＭＤＨ—３和ＭＤＨ—４位点间存在较紧密的连锁遗传，交换值分别达到了０．１４３和０．２４３     

主要水产养殖动物QTL定位的研究现状

数量性状是一个多世纪以来遗传学研究的主要对象之一,因为它是许多重要作物,畜牧和人类的重要性状。最早的工作是在孟德尔定律重新发现之前由Galton[1]开展的。但长期以来,开展数量性状研究主要借助于统计学手段。20世纪80年代,尤其是90年代以来,RFLP,RAPD,AFLP,微卫星,SNP等DN     

小麦雄性核不育基因Tal与rht_(10)基因的连锁遗传

几年来,进行了普通小麦显性雄性核不育基因Tal与矮变1号的矮秆基因Rht_(1c)的等位基因rht_(10)的连锁遗传,以及试图打破其连锁方式,选育重组类型Tal-Rhhrht_(10),使Tal转育至矮变1号的研究,这项研究目前只能获得非期望的另一类tal-rht_(10)交换型配子,本研究表明,两个基因有复杂的连锁关系,可能Tal不仅与rht_(10)主基因,而且与某个修饰基因连锁,重组型是致死的。     

Identification of QTLs Related to Bolting in Brassica rapa ssp. pekinensis （syn. Brassica campestris ssp. pekinensis）

A genetic linkage map of Brassica rapa ssp. pekinensis was constructed with 186 AFLP （amplified fragment length polymorphism） markers by using a doubled-haploid （DH） population with 183 individuals. The individuals were derived from F1 which was developed by crossing a bolting resistant DH line Y-177-12 and an easy bolting DH line Y195-93a. AFLPs were generated by the use of restriction enzymes EcoR Ⅰ and Mse Ⅰ . The segregation of each marker and linkage was analyzed by using JoinMap version 3.0. Mapped markers were aligned in ten linkage groups which covered 887.8 cM with an average marker interval of 4.47 cM. Markers showing skewed segregation ratio were clustered in six LGs. Quantitative trait loci （QTL） were mapped for bolting resistance by using MAPQTL 4.0 package. Four QTLs explaining from 7.0 to 9.4% of the total variation were detected, all of them increase bolting resistance. These mapped QTLs could be used to develop a marker assisted selection programme for bolting resistance breeding.     

家畜的遗传疾患和异常

本文综述了家畜遗传疾患和异常的发生概况,而对主要遗传病患和异常按常染色体隐性遗传、常染色体显性遗传、性连锁遗传、染色体数目和结构的异常等分别进行了描述,分析了发生的可能原因及危害,提出了防止遗传疾患发生和扩散的措施。