维管植物木质部输导特性以及仿生应用的研究

本文从细胞壁、导管(管胞)、木质部三个不同的层次分别论述了维管植物木质部的耐压性和韧性机理,并对木质部强有力的输导性机理进行了阐述。从仿生学角度出发,分别提出了仿生耐压管道和一次性超强榆导毛细管束的仿生结构模型。其中仿生耐压管道自内向外分别由内管、纤维层、增厚层、均压层和保护层组成,具有很好的耐压性和一定的保温性;一次性超强输导毛细管束采用许多根微细的毛细管加以穿孔板组成,能最大限度地维持水的内聚张力。     

The function of extrafloral nectaries in the pollination and reproduction of Sambucus javanica

Sambucus javanica is a perennial herb with extrafloral nectaries (EFNs) on its inflorescences. To explore the ecological functions of EFNs, a factorial combination experiment of ant (access or exclusion) and EFNs (with or without) at the plant level was created in two populations. The role of EFNs in the attraction of ants and flying pollinators, the defensive role of ants against foliar herbivores, the effects of ants on pollinator visitation and the effects of ant–pollinator interactions on fruit production in one or both populations were assessed. Ants were common on the ant-access plants with EFNs, but absent from the ant-access plants without EFNs. Foliar herbivory was independent of ant and EFN treatments and their interactions. The visitation frequency of flying pollinators (honeybees and syrphid flies) and fruit set were significantly higher for plants with EFNs than plants without EFNs, but were not affected by ant treatments or their interactions with EFN treatments. These results suggest that EFNs in S. javanica attracted both ants and flying pollinators, but ants did not present a defensive role against herbivores, did not deter flying pollinators from visiting inflorescences and had no effects on fruit production. In addition, ants were not significant pollen vectors.     

不同时期深施重肥对沙田柚生长结果的影响

比较了夏季深施重肥与冬季深施重肥对沙田柚春梢、根系生长及产量、果实品质、叶片与土壤营养含量的影响。结果表明,夏季深施重肥可在一定程度上提高沙田柚叶片钙、铁、硼、全氮、全磷、全钾、0~40cm土壤速效磷与有机质含量,以及20~40cm土壤的全氮、速效钾和pH值,为根系的生长创造良好的土壤环境条件,进而提高叶片三要素的含量,显著促进新根和春梢的生长;夏季深施重肥的单株产量、单果重量与果实品质与冬季深施重肥间无显著差异。     

四黄散外敷对竹叶青蛇咬伤肿胀的疗效观察

目的 探讨四黄散外敷治疗竹叶青蛇咬伤肿胀的临床疗效.方法 选择2017年10月～2020年4月我院收治的112例竹叶青蛇咬伤肿胀患者为研究对象,采用随机数字表法将患者分为观察组和对照组,每组56例.对照组采用常规蛇咬伤处理方案,包括清创、引流、注射抗蛇毒血清及对症治疗等.观察组在对照组治疗基础上采用四黄散外敷治疗.观察...     

NP配施对平茬后云南松苗木N、P、K化学计量比的影响

为了解NP配施对平茬后云南松(Pinus yunnanensis)苗木各器官N、P、K化学计量比的影响,分析云南松苗木不同器官(根、茎、叶、萌条)的ω(N)∶ω(P)、ω(N)∶ω(K)、ω(P)∶ω(K)化学计量比的季节变化特征,探讨各器官间N、P、K化学计量比的相关性及其变异来源。采用N、P二因素三水平的3×3回归设计开展不同施肥试验,并对苗木采样测定,研究NP配施对平茬后云南松根、叶、茎及其萌条N、P、K化学计量特征的影响。结果表明：平茬后云南松苗木不同器官的营养元素分配没有统一的规律,展现出丰富的变异。随着施肥季节的变化,ω(N)∶ω(P)在根、茎和萌条中逐渐下降,在叶中先下降后上升,但总体差异不大。单施N肥、P肥和NP配施均对云南松苗木生长的影响产生一定差异,总体来看NP配施更有利于促进苗木的生长,且以处理5(N₁P₁)表现为极显著(P<0.01)。云南松苗木各器官N、P、K化学计量比主要受N×P交互作用的影响,其次是N,影响最小的是P。除在根和叶中ω(N)∶ω(P)与ω(N)∶ω(K)之间相关性发生改变之外,其余两两间的正负...     

硅烷偶联剂的研究与应用

硅烷偶联剂是应用最广的一类偶联剂。本文阐述了其结构特征、偶联机理与使用技术,着重综述了硅烷偶联剂的应用范围与具体应用效果,最后展望了硅烷偶联剂的发展方向。     

反向虚拟筛选平台及应用

靶标确证是老药新用、药物毒副作用研究的关键。基于分子对接方法 Auto Dock Vina和内部构建的疾病靶标数据库,采用分布式架构,构建了反向虚拟筛选平台。应用该平台对药物吡斯的明进行靶标确证,最终成功找到其靶标乙酰胆碱酯酶,验证了平台的实用性和准确性。