一类松籽、松鼠、幼苗的征税模型分析

运用微分方程理论，研究了一类非线性的红松种群征税模型，得到了该系统的平衡点，证明了该系统正平衡点的局部渐进稳定性和正平衡点的全局吸引域，利用 Pontryagin 最大值原理给出了最优征税策略。     

凤尾菇线粒体DNA片段的克隆与同源性分析

将Ｓａｕ３ＡＩ部分酶切的凤尾菇线粒体ＤＮＡ插入质粒载体的ｐＢＳ＾＋的ＢａｍＨＩ位点，然后以凤尾基线粒体ＤＮＡ为探针与重组质粒ＤＮＡ进行斑点杂交，筛选到６个阳性克隆，选取其中２个阳性克隆的插入片段分别与来６个属的１３个食用菌品种的线粒体ＤＮＡ进行Ｓｏｕｔｈｅｒｎ杂交，其结果显示两探针能与所有测定的侧耳属品种的线粒体ＤＮＡ杂交，并具多态性，但与其它属线粒体ＤＮＡ只有不同程度的杂交，两探针中Ｈ４的杂交范     

酿酒酵母（Saccharomyces cerevisiae）同源DNA片段的克隆

利用作者克隆的酿酒酵母基因启动子片段Ｙ８为探针和菌落原位杂交方法，从构建的Ｓ．ｃｅｒｅｖｉｓｉａｅ ＹＮＮ２７基因组文库中共筛选８个阳性克隆。根据这些克隆中插入片段大小和限制酶切结果，可将其划分为６种，分别命名为ＹＮ１－ＹＮ６．Ｓｏｕｔｈｅｒｎ杂交结果表明，这６种ＤＮＡ片段不仅能与６．５ｋｂ的全长Ｙ８探针我，而且均能与ＰｓｔＩ酶切Ｙ８所得的３段ＤＮＡ探针杂交。     

RAPD analysis of genetic variability among Stylosanthes guianenesis accessions of resistant and susceptible to the stylo anthracnose

Stylosanthes guianenesis Sw. is an important tropical forage legume grown and utilized in the tropics and the subtropics of South China. Anthracnose, caused by Colletotrichum gloeosporioides (Penz.) Sacc., is a major constraint to the extensive use of Stylosanthes. Forty-five accessions of S. guianensis were assessed with RAPD for genetic diversity and for resistance to anthracnose. RAPD analysis was performed using twenty primers screened from 200 arbitrary oligonucleotides, and a 71.5% level of polymorphism was found. The dendrogram obtained with unweighted pair group method of averages (UPGMA) based on the RAPD data showed genetic similarity from 50% to 94% among all stylo accessions, and fourteen clusters were defined at 66.5% genetic similarity. Two strains of C. gloeosporioides from stylo in China were used for anthracnose resistance screening. All plant accessions showed variation in the reaction to two strains and the correlation of resistance had a value of 0.904. Multiple correspondence analysis displayed a random distribution of the resistance or susceptibility response with respect to the genetic diversity measured by RAPD analysis except one group. Mean distance was also calculated to determine the diversity within clusters. From our results, the RAPD analysis is an effective and efficient technique of providing quantitative estimates of genetic similarity among stylo accessions.     

黄铜在润滑状态下的摩擦系数

本文分析了滑动速度、正压力、润滑油牌号等对黄铜在润滑状态下摩擦系数的影响,指出目前常用设计手册所推荐的摩擦系数的局限性,认为组成运动副的零件的材料不宜都采用黄铜,以及在回转运动副中黄铜不宜作为被包容件的材料。     

测定二级动力学速率常数的一种新方法

在速率常数的测定中长期存在参数A∞的测量问题,本文拟在介绍一种新方法,该法适用于二级动力学反应,可以提供解决以上问题的可靠方法。对于终点数据无法获得或虽可获得但不可靠时该法特别有用。     

无HindⅢ位点新霉素磷酸转移酶标记基因的建立

用体内自发突变，卡那霉素抗性筛选和体外限制酶切富集方法消除载体ｐＮＧ３５中新霉素磷酸转移酶基因内的限制酶位点ＨｉｎｄⅢ，除去ＨｉｎｄⅢ位点后的载体ｐＮＧ３５△Ｈ赋予宿主细胞的卡那霉素抗性水平远远高于原载体ｐＮＧ３５。     

济宁三号煤矿矿井水文地质类型划分

根据实际地质勘探及相关资料,通过对济宁三号煤矿区域水文概况、矿井水文地质条件、断层导水性等方面的分析,对矿井地质、水文地质条件进一步分析研究,总结水文地质规律.依据《煤矿防治水规定》要求,重新划分矿井水文地质类型,得出了济宁三号煤矿水文地质类型为中等的结论,从而为经济合理地搞好矿井防治水工作、确保煤矿安全生产提供了基础资料.     

油菜单株总DNA的快速制备

通过改进匀浆过程确定了适合同时提取多个１００ｍｇ左右植物材料总ＤＮＡ的实验程序,制备的总ＤＮＡ经测定紫外吸收曲线,限制酶作用和ＲＡＰＤ扩增,证明完全符合分子生物学实验的基本要求。     

Further molecular evidence for the Hordeum vulgare ssp. spontaneum in Tibet as ultimate progenitor of Chinese cultivated barley

106 aeeessions of Tibetan wild barley, including 50 accessions of the two-rowed wiht barley Hordeum vulgare ssp. sopntaneum （HS）, 27 accessions of the six-rowed bottle-shaped wild barley H. lagunculiforme （HL） and 29 accessions of the six-rowed wiht barley H. agriocrithon （HA） that separately represent different agrigeographical regions of Tibet, were used to study the genetic diversity and genetie differentiation using SSR markers selected from seven barley linkage groups. 229 allelic variants were identified with an average of 7.6 alleles/locus. The average of total number of alleles per locus in HA （6.4） is much higher than that in HS （3.9） and HL （3.4）. The genetie diversity and its standard deviation among the three subspecies were in the order of HS〉HL〉HA. Very significant genetic differentiation was observed among the three subspecies of wild barley. Comparisons of the results fiom this and previous studies showed a strong Oriental-Occidental differentiation of barley, and that Shannan region of Tibet might be the center of origin of the Tibetan two-rowed wild barley, thus supporting not only the hypothesis of a mono-phyletie origin of cultivated barley but also the proposition that the Tibetan two-rowed wild barley as ultimate progenitor of Chinese cultivated barley.