折耳根无公害规范化栽培技术

通过适宜品种的筛选、无公害规范化栽培技术措施等方面进行了探讨,总结出一套适合贵阳地区折耳根无公害规范化栽培技术,以期指导折耳根生产。     

三江地区稻田害虫种类调查及防治措施

通过查阅大量相关文献,采用网捕法、搜索法、观察法、灯诱法和振落法等对三江地区稻田主要害虫发生种类进行了调查和鉴定。结果表明,三江地区稻田主要害虫有食叶类害虫、钻蛀类害虫、吸汁类害虫和食根类害虫。从农业防治、化学防治和生物防治等方面提出了综合防治措施。     

城市河道生态护坡形式初探——以阜阳市为例

介绍了生态驳岸的类型、特点和功能,分析了生态驳岸设计的要点、植物配置以及亲水空间的构建等,最后以阜阳市中青河、西青河和泉河风景为例研究了如何将生态驳岸形式运用于城市河道的景观建设中。     

Authorware中树型目录的建立

在多媒体课件中采用树型目录，可以让所要呈现的内容结构清晰。本文主要介绍如何利用Autorware中的变量、函数建立树型目录。     

花蕾注药法防治香蕉花蓟马的试验研究

香蕉花蓟马是香蕉果期害虫,主要危害香蕉的花蕾和幼果,通常在花蕾苞叶未张开时已侵入花蕾吸食幼果汁液,并在幼果上产卵[1],引起果皮组织增生、木栓化,到果实后期呈突起小黑点(黑斑),影响香蕉果实外观品质[2]。香蕉花蓟马1年发生多代,世代重叠危害,但由于有苞片阻挡,喷药杀虫的效果只能     

平分最近点算法与Fisher判别分类算法的关系

在线性可分情况下,对平分最近点算法和Fisher判别法构造的判别函数进行了对比研究,得出两类模式在特定的分布和一定的条件下,两种算法是等价的。     

Reactive oxygen species are involved in cell death in wheat roots against powdery mildew

Inoculation of wheat(Triticum aestivum L.) leaves with wheat powdery mildew fungus(Blumeria graminis f. sp. tritici) induces the cell death in adventitious roots. Reactive oxygen species(ROS) play a key role in respond to biotic stress in plants. To study the involvement of ROS and the degree of cell death in the wheat roots following inoculation, ROS levels and microstructure of root cells were analyzed in two wheat cultivars that are susceptible(Huamai 8) and resistant(Shenmai 8) to powdery mildew fungus. At 18 d after powdery mildew fungus inoculation, only Huamai 8 displayed the leaf lesions, while root cell death occurred in both varieties. Huamai 8 had a high level of ROS accumulation, which is associated with increased root cell degradation, while in Shenmai 8, there was little ROS accumulation correlating with slight root cell degradation. The molecular study about the expression levels of ROS scavenging genes(MnSOD and CAT) in wheat roots showed that these genes expression decreased after the leaves of wheat was inoculated. The difference between Huamai 8 and Shenmai 8 on subcellular localization of H2 O2 and O2–· was corresponded with the different down-regulation of the genes encoding for superoxide dismutase and catalase in two wheat cultivars. These results suggested that ROS were involved in the process by which powdery mildew fungus induced cell death in wheat roots.     

浅析教师认可制度的价值取向

本文针对当前教师认可制度存在的诸多价值取向,从制度主义的理念分析了教师认可制度与价值取向的关系,提出教师认可制度的特殊价值取向决定了教师认可制度的价值取向必须以促进教师专业化为目标来确立。     

世博园草坪种类及其病虫害调查

经调查，世博园共有草坪3大类、11种、51个品种，其主要病害有6种、虫害7种，同时对一些主要虫害种类进行了生物学特性研究。