DMP—3B型金相磨抛光机微电脑控制系统

本系统能够很方便地完成金相试样研磨与抛光的速度、压力和时间诸工作参数的现场设置、修改和存贮，也可根据不同金属材料金相试样的要求从存贮器中调用事先优化好的工作参数，按工序的３个阶段自动搭配连续完成抛光过程。在抛光的同时完成速度、压力和时间的自动调节并实时显示。整个抛光过程自动完成，其质量是由８０３１芯片控制系统保证，不受操作人员技术水平的影响。     

国外栽培牧草品种资源的引种研究

总结了１９８３年至１９９０年“中澳合作项目———云南省牲畜和草场改良项目”期间从国外引进的优良牧草１２５个种共计６８１个栽培品种分别在云南七个不同气候带条件下的引种试验。试验通过１２个指标的观测,筛选出优良的牧草种２３个共计５０个栽培品种,并对筛选出的优良品种的定性及定量指标作详细介绍,以利于生产推广。     

冬小麦杂种F1及其亲本光合特性的研究初报

研究了10个冬小麦(Triticum aestivumL.)杂交组合的子一代(F1)及其亲本的光合特性.结果表明,在这10个杂交组合中,虽然只各有4个杂交组合的F1的PSⅡ总的光化学量子产额(Yield)和光化学荧光猝灭系数(qP)有超亲现象,但绝大多数组合的F1光合功能都与母本十分相近,正反交组合的结果进一步证明这种相关性.可见,母系遗传对于F1光合功     

新平县旱地植烟土壤养分状况分析及施肥水平建议

通过对海拔1100～2080 m,4个土类,1573.53 hm2的新平县旱地植烟区土壤pH值、有机质、碱解氮、有效磷、速效钾等养分进行分析,结果表明,64.7%的土壤存在酸化;23.94%土壤有机质和7.91%土壤碱解氮偏低,25.5%土壤有机质和27.07%土壤碱解氮偏高;29.19%的土壤缺磷,52.38%的土壤速效钾低。为此,在烤烟生产上要因地制宜,对偏酸性土壤,应隔年施用白云石粉;适当控制氮肥,适量施用磷肥,注重增施钾肥。     

单粒棉花种子DNA快速提取方法

本研究以棉花干种子为材料,探索一种适用棉花品种SSR分析的DNA快速提取方法。先采用SDS提取液进行一步裂解,并将RNA的去除操作融入抽提过程,从而简单快速的获得高质量棉种基因组DNA。紫外检测与琼脂糖凝胶电泳检测结果均表明,所得DNA纯度高,完整性好。另外,SSR分析结果也显示,扩增带型清晰易辨,重复性与稳定性好。相比常规的以棉花幼苗叶片为材料的DNA提取法,本方法在降低实验成本的同时大大提高了工作效率。     

Characterization and regulation of multiple forms of endo-1,4-β-glucanase genes during longan fruit growth and development

Endo-1,4-β-glucanase (EGase, EC 3.2.1.4) is proposed to be involved in the control of cell wall modification. However, the relationship between EGase and longan fruit growth remains obscure. In the present work, the expression profiles of three Dl-EGase genes in pericarp and aril tissues of longan fruit during growth and development were characterized; moreover, the effects of plant growth substances, naphthalene acetic acid (NAA) and thidiazuron (TDZ) on their expressions of fruits at two different developmental stages were also investigated. The results showed that high levels of EGase activities in aril were in accordance with rapid aril growth, and three Dl-EGase genes exhibited different expression patterns in pericarp and aril during fruit growth and development. Dl-EGase1 and Dl-EGase3 seemed to be associated with the growth of both pericarp and aril, while Dl-EGase2 was closely related to pericarp growth. In addition, treatment of NAA and TDZ at the stage of pericarp growth increased the EGase activities and induced the expressions of all the three Dl-EGases. However, when NAA or TDZ was applied at the rapid aril growth stage, the accumulations of Dl-EGase1 and Dl-EGase2 in the pericarp, and the accumulations of Dl-EGase1 and Dl-EGase3 in the aril were induced. Furthermore, the expression patterns of the three Dl-EGases showed different tissue specificity. It is thus speculated that Dl-EGase genes played a different role in longan fruit growth and were developmentally regulated, and more importantly, the responses of Dl-EGases to plant growth substances were different and dependent on fruit development stage and fruit tissue.     

Detecting the non-breeding region and migration route of Whimbrels(Numenius phaeopus rogachevae)in the East Asian-Australasian Flyway

Determining the migration routes and connections of migratory birds at the population level helps clarify intraspecific differences in migration.Five subspecies...