Transcriptome sequencing of black and white hair follicles in the giant panda

With the completion of the draft assembly of the giant panda genome sequence, RNA sequencing technology has been widely used in genetic research on giant pandas. We used RNA-seq to examine black and white hair follicle samples from adult pandas. By comparison with the giant panda genome, 75 963 SNP loci were labeled, 2426 differentially expressed genes (DEGs) were identified, and 2029 new genes were discovered, among which 631 were functionally annotated. A cluster analysis of the DEGs showed that they were mainly related to the Wnt signaling pathway, ECM–receptor interaction, the p53 signaling pathway, and ribosome processing. The enrichment results showed that there were significant differences in the regulatory networks of hair follicles with different colors during the transitional stage of hair follicle resting growth, which may play a regulatory role in melanin synthesis during growth. In conclusion, our results provide new insights and more data support for research on the color formation in giant pandas.     

森林多功能的时空尺度划分及其相互关系分析

根据国内外研究成果,把森林功能划分为7大类,结合生态系统和森林经营对7种功能的时空尺度进行了划分。用独立、互补及竞争3种情形对各功能之间的相互关系进行了描述,并分析了功能之间的冲突及其协调的途径。结果表明,森林多功能在空间尺度上划分为国家、区域、经营单位和林分,在时间尺度上划分为短期、中期和长期。森林功能间的关系在不同的时空尺度上并不一致,它们之间的冲突有些是可以解决的,有些只能缓解,有些不能避免。有些功能在较大尺度上是有条件相容的,在较小尺度上功能之间的关系是相容或对立的。只要能在较小的时空尺度上解决冲突,各功能之间就不会产生不可协调的矛盾。研究结果为开展森林多功能经营提供理论依据。     

大扁杏整形修剪中的问题及解决办法

大扁杏是优良甜仁杏的总称，与山杏（苦杏仁）相比，不但具有山杏的抗旱、耐瘠薄、适应性强、管理省工、产品耐贮、耐运的特点，而且是经济价值特别高的经济林树种，被群众称为“铁杆庄稼”。其仁、肉、核壳均可进行综合利用，国内外有着极大的市场。我地区大扁杏发展很快，但是在大扁杏整形修剪技术上存在着诸多的问题，已经严重影响了产量和效益的提高。[第一段]     

不同类型杂交稻品种抛秧栽培增产技术研究

采用三元二次正交旋转组合设计方法,研究了旱育抛秧的叶龄、抛植密度、施N水平等因子,对穗重型和穗粒兼顾型杂交水稻品种Ⅱ优6078与岗优22中稻产量的影响;优选了不同水平的栽培技术因子方案,解析了各因素对产量的效应,并建立了相应的数学模型。     

Hysteretic Behavior of Composite Deep Beam Infilled Steel Frame

The Quasi static tests of one steel frame and two the composite deep beams infilled steel frames were carried out. The effects of the deep beams on the load capacity, ductility, hysteretic property and energy dissipation of pure steel structure were analyzed. It is found that the hysteresis curve is a straight line with the constant of the stiffness at the beginning and without residual deformation. And the hysteresis curve of specimen was full after yielding, and the skeleton curves had a clear plastic flow phase with triple linear. The lateral drifts of the beam specimens at failure were 1/25 and 1/22. The composite deep beams enhance the initial stiffness, yield load and maximum load bearing capacity of steel frame. Therefore, seismic performance of the composite deep beams is better.     

Effect of Metal Ion Adulterant on the Photocatalytic Degradation Properties of TiO2 Photocatalyst

TiO_ 2 photocatalyst can degrade organic pollutant in waste water efficiently. Metal ion-doped TiO_ 2 nanoparticles are prepared with different doping amount by sol-gel method. The prepared sample are evaluated by the photo-catalytic oxidation degradation experiment of methyl orange. The experiment results indicate that the photo-catalytic activities of Cr~(3+)-doped TiO_ 2 are photoactive than bare TiO_ 2, and that in the Cr~(3+)-doped TiO_ 2 system, 1.0% is optimal amount of doping. Furthermore, it is studied that the degradation rate of methyl orange can reach 92% in UV light of 4 hours and 85% in visible light of 6 hours.It can be expected that M~(n+)- TiO_ 2 photocatalyst is widely applied to the degradation of organic pollutant in waste water treatment.     

Theoretical Analysis on 13-Bit Lattice Gas Automata Model with Poly-velocity and its Simulation

An 13 bit lattice gas automata model has been investigated from fluid discrete dynamics. By gaining the moment equations from lattice Boltzmann equation and using Chapman Enskog expansion, the fluid dynamics equation and energy equation of 13 bit lattice gas automata model with polyvelocity have been deduced. The validity of the model using for non isothermal fluid dynamics has been proved . Finally, simulation results for non isothermal flow pass plate have been shown     

越冬栽培稻产量性状相关QTL定位

越冬栽培稻是一类能越过自然冷冬季节并在第2年春季萌芽、正常开花结实、收获稻谷的水稻品种。本文通过对越冬栽培稻产量性状QTL分析,明确产量相关性状的遗传规律,旨在进一步解析越冬栽培稻产量性状的遗传机制,为育种创新利用提供理论依据。以3份越冬栽培稻构建的3个半同胞F2群体为材料。各考察15个产量相关性状,利用Excel 2003、GraphPad Prism 5.0和QTL IciMapping 4.10软件分析数据、绘制遗传图谱、定位QTL和联合分析。结果表明,产量性状表型值在3群体中呈连续正态分布,表现为数量性状遗传。共检测到37个QTL和26对上位性QTL,贡献率分别介于2.32%～36.31%和1.04%～2.05%;检测到9个同时影响2个及以上产量性状(一因多效)QTL标记区间;以联合分析检测到13个产量性状相关QTL,其中4个QTL区间与单群体检测QTL区间重叠;越冬栽培稻产量相关性状QTL以加–显性效应遗传为主、上位性遗传效应为辅。本研究将为越冬栽培稻产量相关基因挖掘及育种创新利用奠定基础。     

中药抑制番茄晚疫病原菌的配伍筛选及抑菌效果初步研究

为得到对番茄晚疫病原菌有更好抑制作用的生物药剂,对15种中药进行筛选,并进行配伍抑菌研究,得出最佳三配伍抑菌组合为青蒿∶五味子∶乌梅=1∶4∶1,抑菌圈直径达到了56 mm,最佳配伍液的最小抑菌浓度(MIC)为7.82 mg/mL,最小杀菌浓度(MBC)为31.25 mg/mL,对生长曲线的抑制作用明显。将该中药配伍液稀释500～1 000倍时,其抑菌率明显高于典型化学抑菌剂。     

过程性能指数在烟梗预处理工艺参数优化中的应用

针对加湿梗成品含水率控制稳定性差、湿透率低的问题,对稳定控制一次回潮热水温度、二次回潮蒸汽压力、二次回潮加水量环节进行了系统研究,采用统计过程控制技术对加湿梗成品含水率进行控制,以提高加湿梗含水率的稳定性。通过正交试验优化了3个主要工艺参数,并进行直观分析以及生产验证,结果表明最佳工艺组合为:一次回潮水温60℃,二次回潮蒸压力0.65 MPa,二次回潮加水量0。