半固定管道式喷灌系统移管机行走轮平衡状态的研究

对半固定管道式喷灌系统移管机运行过程中的平衡问题进行了分析研究，建立了运动时行走轮稳定状态的数学模型，论证了研制移管机的可行性。     

基于Pro/E的装配体三维设计

介绍了使用Pro/E计算机软件作为计算机设计绘图工具，建立3D实体模型，然后根据零件间的位置关系将所涉及的零件逐个地进行装配；并简单阐述了其工程图的制作及齿轮三维造型的方法。     

传统学习行为与网络学习行为比较研究

网络媒体的发展使得网络学习行为的研究成为热点。把传统学习行为与网络学习行为进行对比,比较两者的优缺点,找出网络学习的规律和特点,更好地服务于网络教学,提升教学水平。     

葡萄霜霉病调查及无公害药剂防治试验

以鲜食葡萄"红地球"为试验材料,调查其霜霉病发生时间、发病原因及发病危害程度,比较5种杀菌剂在葡萄霜霉病发病前后的防治效果。结果表明:在开花前和幼果期使用松脂酸铜、阿米西达进行有效预防,可保证果实的正常发育;在发病后及时选择优秀治疗剂可杀得2000、抑快净,可有效控制霜霉病的蔓延。     

Single nucleotide polymorphisms of TLR4 locus in Chinese Cantonese population

AIM: Toll-like receptor 4 (TLR4) was an important pathogen recognition receptor in the innate immune system. The aim of this study was to investigate the distribution of TLR4 polymorphisms in the general population of China. METHODS: Peripheral blood samples were collected from 191 unrelated healthy Chinese Cantonese individuals. The functional regions of TLR4 locus, including promoter region and all three exons with their surrounding intronic regions were amplified using polymerase chain reaction. After purified, the amplified products were directly sequenced on both strands. RESULTS: A total of eight single nucleotides polymorphisms (SNPs) were detected, five of which were novel. The most common SNP were -1607 C/T with the minor allele frequency of 0.283. Two nonsynonymous substitutions Asp299Gly and Thr399Ile, which were common in Caucasus, were not detected in Cantonese. Neutrality test revealed that TLR4 in Chinese Cantonese was not significantly deviated from the neutral model. CONCLUSION: This is the new finding on the distribution of TLR4 SNPs in the general population of China. It provides several ethnic specific SNPs for further disease association studies of TLR4 polymorphisms in Chinese populations.     

土壤种子库的研究方法综述

主要从取样方法、取样时间和种类鉴定等方面对土壤种子库研究方法进行综述,重点介绍了种子萌发法,并且提出了要采取长期定位观测的方法对土壤种子库的长期完整动态进行较系统的研究,而且最好在种子库长期的定位研究中搞清楚研究区内植物种的物种特性并且建立一个幼苗标本库,以增加土壤种子库研究的准确性。     

猪miR-206前体的克隆、表达及生物信息学分析

研究骨骼肌中表达的miRNAs对深入探明骨骼肌生长发育的调控机制具有十分重要的意义。采用比较基因组学与生物信息学相结合的方法,从猪骨骼肌中克隆了猪miR-206的前体（Precursor）,对该miRNA前体的二级结构及与其它物种序列的同源性进行了分析。RT-PCR结果显示,该前体miRNA在猪大多数组织中均有表达,在骨骼肌中表达量最高。生物信息学分析表明miR-206前体序列在不同物种间具有较高的保守性。     

黄河干流梯级水库补偿调节方案风险分析

本文以黄河干流梯级水库补偿调节为例,系统分析了补偿调节方案的主要风险因素,提出了多因素组合风险估计的蒙特卡罗(Monte-Carlo)随机模拟技术,并根据风险指标对补偿调节方案的风险做出评价。结果表明,研究建立的补偿调节方案风险模型是合理可行的。     

山茱萸中熊果酸的超声波提取工艺研究

采用正交实验对山茱萸中的熊果酸进行超声波提取工艺优化,并进一步用石油醚和四氯化碳对提取液进行除杂.研究结果表明:用超声波提取熊果酸的最佳工艺条件为:80%乙醇,料液比1:20,提取时间30min,提取温度55C.适宜的除杂办法为石油醚洗脱3次,用量为0.2倍于提取液的体积;四氯化碳洗脱3次.用量为0.3倍于提取液的体积.