機械除草と米ぬか散布等を組み合わせた水稲有機栽培体系の抑草効果と収量性

From 2008 to 2013, field experiments were conducted to investigate the effects of organic rice cultivation on weed control and rice production at Tsukubamirai, Ibaraki, Japan. On the 10th and 20th days after transplanting, weeding was carried out with a riding-type weeder used in organic cultivation. From 2008 to 2010, rice bran was applied at each weeding time, but after 2011, it was applied at the time of transplanting and the first weeding. At the 6th week after transplanting, the weed dry weight after weeding was less than 2% compared with the　weight when weeding on the interrow space was not conducted. However, for interhill space, the ratio varied　between 6% and 35%, irrespective of weeding times. In particular, the weed dry weight at harvesting time　greatly decreased after 2011. The average of the vacant hill rate after weeding was 6% throughout the trials.　Plant height and leaf color (SPAD) were overall higher with organic than conventional cultivation; however,　stem number tended to be lower. At the harvest time, the stem length was longer and the panicle number was　significantly lower with organic cultivation. The average rice yield from organic cultivation was approximately　96% of the yield with conventional cultivation. It is concluded that the organic cultivation system used in this　experiment is useful, because the weeding was effective and the rice yield was almost same as with　conventional cultivation. It is also considered that an increase in panicle number is a more important factor to　stabilize organic rice production

单链构象多态性-毛细管电泳分析中样品纯化研究

聚合酶链反应(PCR)样品中的Cl^-、引物等小分子对单链构象多态性一毛细管电泳分析有重要影响。本文用毛细管电泳一间接紫外法测定了PCR样品中的Cl^-浓度，并对乙醇沉淀法和试剂盒纯化法用于PCR样品的纯化效果进行比较，在此基础上研究了Cl^-浓度、引物及其二聚体在SSCP-CE分析中的影响。结果表明，它们主要影响DNA进样量而对分离效率影响不大

一种面向标准评估的高保证安全操作系统开发方法

构造高保证的安全操作系统是信息安全研究领域的重要内容之一.目前通用标准(Common Criteria)提供了衡量安全操作系统安全性的流行准则.本文以开发安全操作系统SECIMOS的实践为基础,从安全目的出发,通过各类保证措施,提出了如何构建符合CC标准的高保证安全操作系统的方法.文中给出了CC标准的评估模型、评估过程,并分析了安全要求的产生.以SECIMOS系统为例,给出了该系统的实现框架,分析了安全功能与安全目的间的对应,以及为达到标准要求而在系统开发过程中使用的各种保证证据和保证措施.本文通过深入剖中国科学院计算技术研究

支持增强Linux安全性的多个安全策略模型的统一框架

首先分析Linux系统中两种主要安全机制的局限性.然后,给出SECIMOS的构建,简介了各个安全策略模型及其实现模块,并描述结合多个安全模块的方法.最后,给出了SECIMOS的性能参数和与其他安全项目之间的比较

毛细管电泳-单链构象多态性分析检测K-ras基因突变

K-ras癌基因的点突变在结直肠癌的发生起重要作用。以异丙醇为聚合反应链转移剂，水相法合成特性粘度为O．70×10^-3m^3／kg，分子量为6．5×10^4的低粘度短链线性聚丙烯酰胺。以6％线性聚丙烯酰胺为筛分介质，分离温度27℃，分离电压9kV为电泳条件，建立了检测K-ras基因突变的毛细管电泳．单链构象多态性方法。利用该方法检测36例结直肠癌患者肿瘤组织，发现12例K-ras基因突变。结果表明：该方法具有快速、高灵敏的优点，为大规模进行结直肠肿瘤的早期诊断提供了可靠方法