农机化装备结构多目标优化的模糊综合评判方法

通过对农业机械化装备结构影响因素的分析研究．从农业产品产业结构、农业投入产出水平、农业农艺农作条件、农业生产组织形式和农业技术人才资源五个方面建立评价指标体系，提出农业机械化装备结构多目标优化的模糊综合评判模型，为农机化规划巾装备结构的优化提供一种科学的方法和决策依据。     

春小麦优良变异类型的选择参数—协调指数

用分形理论的思想 ,对小麦分离与不分离群体内各单株性状组合特征进行系统分析 ,在不改变性状表达程度与群体分布状态的前提下 ,根据各单株的每一性状占各自群体最大值的比例数 ,及各比例数大小序号 ,求二者间双对数的回归斜率 ,作为该单株性状组合的协调指数。结果表明 ,该指数小 ,表示本单株各性状在表达程度上接近 ,说明性状间关系比较协调 ,否则即不协调。     

旅游城市化现象初探——以新疆吐鲁番市为例

旅游城市化是随着城市化和旅游业的不断发展而出现的一种必然现象 ,本文以吐鲁番为例阐述旅游城市化对城市发展的作用 ,并在此基础上说明实施旅游城市化应注意的问题如 :要选择和确定城市发展的主题 ,城市规划和旅游规划要协调一致 ,城市要有较为完善的旅游服务设施体系及城市的社会经济发展不能完全依赖于旅游城市化等。     

The antimicrobial susceptibility of Staphylococcus species isolated from canine dermatitis

In a retrospective study, 1538 strains of -haemolysin-producing Staphylococcus species isolated from dermatitis in dogs at three veterinary clinical microbiology laboratories in Norway during 1986–87 and 1993–94 were investigated for their antimicrobial susceptibility. None of the strains was resistant to cloxacillin, cephalexin or the quinolones enrofloxacin and ciprofloxacin. More than 96% of the strains were susceptible to trimethoprim-sulphonamide, bacitracin and fucidic acid. Between 67% and 89% of the strains were susceptible to erythromycin, lincosamides, tetracycline, neomycin and chloramphenicol. Only 37.9% of the strains were susceptible to penicillin. The frequency of penicillin resistance increased significantly between the first and second periods, from 46.0% to 58.6%. The frequency of resistance to lincomycin, clindamycin and erythromycin also increased significantly between the first and second periods, from 3.0%, 2.1% and 3.3% to 25.5%, 19.5% and 24.8%, respectively. A moderate increase in resistance to tetracycline was also noted, from 20.4% in the first to 27.6% in the second period. On the other hand, the frequency of resistance to trimethoprim-sulphonamide decreased significantly from 4.1% in the first to 0.9% in the second period. Many different resistance patterns were observed in each period. However, the proportion of multiresistant strains increased from 2.1% in the first to 10.2% in the second period. There was a decrease in resistance to the combination of trimethoprim-sulphonamide and penicillin from the first to the second period. Resistance to the combination of lincosamides and pencillin increased. For the combinations penicillin-tetracycline-lincosamides, pencillin-lincosamides-erythromycin, and pencillin-tetracycline-lincosamides-erythromycin, there was a striking increase in resistance between the first and the second periods.Abbreviations CVL Central Veterinary Laboratory - NCVM Norwegian College of Veterinary Medicine - NVL Norwegian Veterinary Laboratory     

高寒牧区牧鸡鸭治蝗效果试验

在青海湖北岸高寒牧区利用人工饲养的鸡鸭进行放牧防治草原蝗虫。结果表明,在60d的防治期内,牧鸡鸭平均灭治效果达91.4%,为人工利用天敌治虫技术在高寒牧区的应用提供了依据。     

猪生殖与呼吸综合征病毒M基因和N基因的表达

将猪生殖与呼吸综合征病毒（PRRSV）的M基因和N基因从重组质粒pMD18-T—M—N中亚克隆至pBV220原核表达栽体上，成功构建了重组表达质粒pBVM—N。将pBVM—N转化大肠埃希氏菌DH5α感受态细胞．重组菌经温度敏感诱导表达，其细菌裂解物经SDS—PAGE可检测到分子质量约为19ku的目的蛋白，与M基因表达产物一致；经蛋白质分析软件Bandscan分析，其表达量可达19．1％；Western-blotting分析表明，该重组蛋白可被兔抗PRRSV血清所识别，与预期的M基因表达产物相一致，而N基因未获表达。     

陕甘宁老区建立生态特区的必要性分析

本文从历史与现状方面分析了陕甘宁老区加强生态环境建设的必要性。阐述了陕甘宁老区历史上范围的变化及其对中国革命和经济建设的贡献。从多方面分析了它的自然条件 ,揭示了其自然环境的脆弱性。说明了该区经济建设取得的成就和存在的问题 ,揭示了其贫困落后的社会经济状况。提出了在该区建立生态特区以促进其生态环境建设的观点。     

春丰50苦瓜的选育

以曼谷青皮、碧绿1号和钦州大肉苦瓜为育种材料,采用双父本混合花粉杂交和后代系谱选择育成优良自交系,再经配合力测定选出优良一代杂种春丰50。该品种生长势强,果实粗棒形,纵径26.3cm,横径6.45cm,皮色翠绿油亮,一般单果质量420g左右。平均每667m~2产量3 500kg。     

关中平原小麦产量对气候变化区域响应的评价模型研究

根据关中地区宝鸡、西安、渭南与咸阳 4地 (市 )的 1 949～ 1 999年的逐年小麦单产记录序列以及 4地 (市 )的气象观测站点自建站以来至 2 0 0 0年近 5 0年的气象记录序列 ,对关中地区小麦产量与年均温、年降水作相关分析 ;探讨了关中地区小麦单产对气候变化区域响应的评价模型。结果发现 :关中平原气候具有暖干化趋势 ;随着气温变暖 ,小麦产量增加幅度减小 ;小麦产量对降水波动的响应比对气温波动的响应显著。     

Protective effect of onychin on the human umbilical vein endothelial cells injured by menadione

AIM: To investigate the protective effect of onychin on the endothelial cells injured by oxidative stress. METHODS: The injured model was established by endothelial cells treated with menadione. The growth inhibitory rate of endothelial cell was determined by MTT assay; NO₂^-／NO₃^- concentration in the medium was determined by nitrate reductase assay; eNOS and caveolin-1 protein levels were determined by Western blot. RESULTS: Onychin significantly decreased the growth inhibitory rate of endothelial cells injured by menadione, increased NO₂^-／NO₃^- concentration in the medium and eNOS activity and up-regulated caveolin-1 expression. CONCLUSION: Onychin possesses a protective effect against endothelial cell injury induced by menadione via caveolin-1/eNOS pathway.