地顶孢霉培养物对蛋鸡生产性能、蛋品质、抗氧化能力、免疫功能和肠道形态的影响

本试验旨在研究地顶孢霉培养物（ATC）对蛋鸡生产性能、蛋品质、抗氧化能力、免疫功能和肠道形态的影响。选取健康且体重相近的70周龄伊莎褐蛋鸡960只，随机分为5个组，每组6个重复，每个重复32只。对照组饲喂基础饲粮，试验组饲喂在基础饲粮中分别添加0.05%、0.10%、0.15%和0.20%ATC的饲粮。预试期1周，正试期9周。结果表明：1）与对照组相比，饲粮添加0.10%、0.15%和0.20%的ATC显著提高了平均日产蛋重（P<0.05），饲粮添加0.15%和0.20%的ATC显著降低了料蛋比（P<0.05）。2）与对照组相比，饲粮添加不同水平的ATC均显著提高了平均蛋重（P<0.05），饲粮添加0.05%的ATC显著提高了蛋白高度和哈氏单位（P<0.05）。3）与对照组相比，饲粮添加0.05%、0.10%和0.20%的ATC显著降低了血清尿素氮（UN）含量（P<0.05）。4）与对照组相比，饲粮添加0.15%的ATC显著提高了血清谷胱甘肽过氧化物酶（GSH-Px）活性（P<0.05），饲粮添加0.05%、0.10%和0.20%的ATC显著降低了血...     

木材染色处理工艺参数对颜色坚牢度的影响

根据可见光分光光度计的工作原理,设计了一种测定染色木材试验颜色坚牢度的方法,并利用这一方法讨论分析了木材染色处理工艺参数对颜色坚牢度的影响。试验以尾×巨桉（Eucalyptus　urophylla×grandis）为试材,以酸性染料为染色剂。试验结果表明在染液配方、染液材积比和染色时间控制不变的条件下,染液温度为颜色坚牢度的第一位影响因子,达到1％显著性水平。在25～80℃的范围内,颜色坚牢度随温度升高而增长,温度越高,增长越快。其次为固色剂浓度,达到5％显著性水平。在0～0.3％的范围内,颜色坚牢度随固色剂浓度增大而增长,低浓度时增长较快。再次为染液pH值,它对颜色坚牢度的影响较小,仅达到10％显著性水平。渗透剂JFC用量对颜色坚牢度的影响不显著,略显负的效应,此有待进一步证实和深入研究。     

植物组培苗培养技术数据库查询系统的构建

当前,植物组织培养研究工作从组培苗种类到研究成果日益增加和提高,为增强其研究成果的生产力转换效率,增加农业企业信息需求,满足农业生产的需要,笔者采用计算机网络编程技术,应用ASP语言,设计完成了包含组培苗全套培养信息的培养技术数据库,编写了技术数据库检索查询系统,该系统实现了植物组培苗技术的集中与网上资源共享,为植物组培科研工作者提供了丰富的研究信息,也为企业增加了农业生产创新途径,同时更有效地加强了高水平组培技术和优良组培苗的推广及应用于农业生产。     

Positive Fixed Point for Semidifferentiable and Upper Semicontinuous Set-valued 1-set-contractive Mapping

Using semidifferentiable concept for set-valued mapping and defining strong semiconpact for set-valued mapping. The article studies the existence of positive fixed point for semidifferentiable and Upper semicontinuous set-valued 1-set-contractive mapping.     

INFLUENCE OF PLASMA TREATMENT ON SURFACE ENERGY OF UHMW-PE FIBRES

The fibre-resin adhesion has been reinforced by plasmatreatment on ultra-high molecular weight polythlene(UHMW-PE)fibres.This paper reports a study of the mechanism of the adhesion from thechanging of the surface energy.The experimental results show the surfaceenergy of the fibres has been greatly increased for plasma treatment andthus meets the prerequisite of fibre-resin adhesion.The fibres are comple-tely rinsed in the epoxy matrix.     

EXISTENCE OF PERIONDIC SOLUTIONS FOR AUTONOMOUS PLANAR SYSTEMS

In this paper,the existence of periodic solutions for autonomous planar systemsis studied and sufficient conditions for the existence of non-zero periodic solutions of this kind areobtained.Some known results are extended and improved.     

甘蓝型油菜隐性核不育两用系S45AB中与MS2Bnap基因同源片段的克隆及序列分析

以甘蓝型油菜隐性核不育两用系S45AB的可育株和不育株为材料, 提取减数分裂期与单核期的花粉mRNA, 反转录合成cDNA, 并以其为模板扩增花粉特异基因MS2Bnap. 结果减数分裂期能扩出产物, 而单核期无任何产物. 将减数分裂期的扩增产物克隆、测序. 同源性分析表明: 在S45AB上克隆的MS2Bnap基因与Gene Bank公布的拟南芥控     

ON THE EXISTENCE OF LIMIT CYCLES OF A CLASS NONLINEAR EQUATION

This paper uses the Poincare-Bendixson's annular region theorem with existenceof limit cycles of a cfass of nonlinear differential equation.     

刺槐种子硬实破除方法探讨

硬实是豆科植物普遍存在的现象，硬实种子不透水，必须经过适当处理来提高种皮的透性种子才能萌发。研究表明：热水浸种、砂擦处理、浓硫酸浸泡、切除部分子叶对刺槐硬实的破除均有作用，以热水（100℃）浸种24h为最好，硬实种子发芽率达79.33%,若应用逐次增温处理效果更好。本研究为刺槐硬实种子利用提供了依据。     

Introgression of bacterial blight resistance genes Xa7, Xa21, Xa22 and Xa23 into hybrid rice restorer lines by molecular marker-assisted selection

Four bacterial blight (BB) resistance genes, Xa7, Xa21, Xa22 and Xa23, were introgressed into an elite hybrid rice restorer line Huahui 1035, by marker-assisted selection (MAS). Ten promising BB resistant lines identified by MAS approach in Huahui 1035 restorer background and their respective F₁ hybrids with a cytoplasmic male sterile line i.e. Jinke 1A, three BB resistant gene donors and their recurrent parent were evaluated for BB resistance by inoculating them with eleven representative races of Xanthomonas oryzae pv. oryzae (Xoo) in China. Further, the ten marker assisted selection of BB (MAS-BB) resistant restorer lines and their F₁ hybrids were also characterized for agro-morphological traits and grain yield. Results revealed that restorer lines with Xa23 introgression i.e. HBQ809 and HBQ810 were found to be resistant to all eleven Chinese representative Xoo races, showing broad spectrum resistance to BB. However, the lines possessing Xa7 or Xa7+Xa21 were resistant to ten out of eleven Xoo races. While restorer lines with Xa21 were resistant to nine out of eleven Xoo races. Interestingly, the F₁ hybrids with Xa23, Xa7 or Xa7+Xa21 were resistant to two severe epidemic Xoo races of China. Restorer lines i.e. HBQ807 and HBQ808 possessing Xa22 were only resistant to six or five out of inoculated eleven Xoo races. Lesion length comparisons between restorer lines and their F₁ hybrids for the above four BB resistance genes showed them to be dominant in heterozygote genotype. Three promising high yielding F₁ hybrids with BB resistance were identified for immediate exploitation for hybrid rice production in China.