Risk analysis of Bovine Spongiform Encephalopathy in Korea

The occurrence of Bovine Spongiform Encephalopathy (BSE, so called mad cow diseases) that was first identified in England in 1986 was considered as being limited to only European countries, including England. However, the outbreak in Asia as well as North America since 2001 has amplified the fear that there isn't any nation in the world that is a safe area. In order to assess the risk of BSE outbreak in each country, the Office International des Epizooties (OIE) and EU have respectively established criteria, where OIE has set 5 levels and EU has set 4 levels. The Scientific Steering Committee (SSC) of the European Commission conducted a Geographical BSE Risk(GBR) assessment for 64 nations, such as the United States, etc., as of April 29, 2003. However, as of July 1, 2005, the duty of GBR assessment is expected to be transferred to a newly established body called EFSA (European Food Safety Authority, located in Parma, Italy). As Korea has not undergone a GBR assessment up to now, this study analyzed the risk of BSE outbreak in Korea by reviewing BSE prevention measures, etc., that have been put in place. This study shall be a barometer for estimating the GBR assessment level of Korea.     

微生物降解多环芳烃研究

在比较研究和具体实践的基础上,提出了漆酶、锰过氧化物酶和木素过氧化物酶活力测定的标准方法,详细介绍了各标准方法的具体操作步骤及其在实际研究中的分析应用.     

甘肃珍稀濒危药用植物资源与保护

随着人们对天然绿色药物需求量的日益增加,野生药用植物的生存和发展面临着巨大威胁,据统计,我国受威胁的药用植物已达1000余种。甘肃地处青藏高原,内蒙古高原和黄土高原交汇地带,特殊复杂的自然环境,蕴育了丰富的药用植物资源,种类达2000余种,蕴藏量约占全国第5位,其中有许多属于珍稀濒危药用植物,如冬虫夏草、杜仲、秦艽、贝母、羌活、天麻等。     

Trans-10, cis-12 conjugated linoleic acid modulates phagocytic responses of canine peripheral blood polymorphonuclear neutrophilic leukocytes exposed to Clostridium difficile toxin B

Trans-10, cis-12 conjugated linoleic acid (t10c12-CLA) has been reported to enhance phagocyte function. Clostridium difficile toxin B (TcdB) has been known to inhibit Ras-homologous (Rho) guanosine triphosphatases (GTPases) which play essential roles in neutrophil immune functions. Here, we examined whether in vitro treatment with t10c12-CLA modulates the filamentous actin (F-actin) polymerization, phagocytic capacity, and oxidative burst activity (OBA) of canine peripheral blood polymorphonuclear neutrophilic leukocytes (PMNs) exposed to TcdB. Treatment with t10c12-CLA, but not linoleic acid, enhanced PMN F-actin polymerization, phagocytic capacity, and OBA, while TcdB suppressed these functions. t10c12-CLA reversed the suppressive effects of TcdB on these PMN functions. t10c12-CLA stimulated F-actin polymerization regardless of whether phagocytosis was stimulated by microspheres but only elevated OBA when microspheres were added. We asked whether the effects of t10c12-CLA were associated with changes in the activation of the Rho GTPase Cdc42. Treatment with t10c12-CLA augmented Cdc42 activity in both TcdB-treated and TcdB-naive PMNs during phagocytosis. Thus, t10c12-CLA up-regulates PMN phagocytic responses attenuated by TcdB. This effect is associated with an increase in actin polymerization and may involve the activation of Cdc42.     

谈多样化军事任务下军犬繁育工作系统化建设——赴欧洲引进种犬的认识

<正>2009年11月12日至12月8日,由总参军务部牵头组成种犬采购团,赴德国、英国等国家为全军引进了一批优良种犬,成功实现了我军种犬第五次换代,作为经历这次种犬引进全过程的参与者,笔者结合这次经历     

草地蝗虫发生原因及可持续管理对策

本研究探讨了影响草地蝗虫数量动态变化的主要因素,并就如何实现草地蝗虫的可持续管理对策做了较为系统全面的概述。认为全球气候温暖化、干旱化以及区域性气候异常,食物资源,种间种内竞争,环境因子以及草地利用方式和强度等是导致草地蝗虫数量动态变化以及可能引发蝗虫灾害的主要原因。同时提出基于生态安全、经济有效和草地生态系统可持续发展的原则作为管理草地蝗虫的指导方针。最后,将强化蝗虫发生机理及预测预报技术研究,积极探索草地管理措施在调节蝗虫数量中发挥作用,尝试草地蝗虫管理新的方法和技术,扩大生物防治范围和力度并确立新型化学防治技术作为实现草地蝗虫可持续管理的主要措施。     

hMG与FSH配合孕激素对多浪羊同期发情比较研究

采用孕激素分别与hMG和FSH配合对多浪羊进行同期发情处理,研究不同激素组合的同期发情效果。将181只多浪羊随机分为3组,第1组64只采用孕激素+50 U FSH处理;第2组59只采用孕激素+15 U hMG处理;第3组58只采用孕激素+20 U hMG处理。结果表明:3组羊的发情率分别为93.75%、94.92%和98.28%;发情同期率分别为89.1%、91.5%和93.1%;撤栓到发情的间隔时间分别为49.60、44.79 h和44.79 h;发情持续期分别为30.6、33.43 h和29.57 h。各指标在3组间均无显著差异(P>0.05)。试验结果表明,用hMG可以代替FSH进行多浪羊的同期发情处理。     

儿茶素在家兔体内的药物动力学及生物利用度研究

对家兔单剂量静注和灌服儿茶素 (Catechin) 2 5mg/kg体重各 5只。用高效液相色谱法测定其血药浓度。房室模型分析表明静注给药后的药时数据符合无吸收二室开放模型 ,主要动力学参数为 :t1 / 2α=( 0 .1 5± 0 .0 1 )h ,t1 / 2 β=( 0 .5 8± 0 .0 2 )h ,Vc=( 1 .41± 0 .0 8)L ,Vβ=( 2 .97±0 .1 1 )L ,ClB=( 3.5 3± 0 .1 0 )L/h ,AUC =( 1 6.95± 1 .5 2 )mg/(L·h)。灌服儿茶素的药时数据符合一级吸收一室开放模型 ,主要药物动力学参数为 :t1 / 2Ka=( 0 .39± 0 .0 6)h ,t1 / 2Ke=( 0 .79±0 .1 1 )h ,tmax=( 0 .78± 0 .1 1 )h ,Cmax=( 3.35± 0 .1 6)mg/L ,AUC =( 7.45± 0 .94)mg/(L·h) ,F =( 4 4.1 8± 3.5 9) %。儿茶素在健康家兔体内的药动学特征是 :吸收迅速 ,达峰时间短 ,消除快 ,半衰期短 ,表观分布容积较大 ,口服摄入吸收不完全     

关于肉羊业科技水平的度量指标及其内涵分析

根据我国西部肉羊业生产方式、经济增长方式的现状和发展方向及现代肉羊业生产的基本特征,选择年存栏羊只平均产肉量指标作为肉羊业生产科技水平的度量指标;在对存栏羊只年平均产肉量主要影响因素系统分析的基础上,提出了存栏羊只年平均产肉量指标的估计公式,并解读了估计公式蕴含的丰富内涵和实际应用价值。     

铜川市耀州区农户肉羊农牧生态系统能量流动规律的研究

运用生态学的系统分析方法,以铜川市耀州区金圣生态养羊示范基地农户肉羊农牧生态系统为研究对象,对系统的能量流动规律、种植业与养殖业的生态效率进行分析.分析表明三种规模养殖农户种植亚系统能量产投比与结构调整前相比分别提高了39.40%、39.50%和30.40%,向养殖亚系统输入的总能量占养殖亚系统需能总量的96.61%,88.45%和80.55%;养殖亚系统的能量转化效率分别达到7.35%、8.00%和8.39%,输入到种植亚系统的粪尿能水平分别是调整前粪尿能输入水平(37.64×103 MJ/hm2)的1.57倍、1.84倍和2.07倍.整个系统的经济投入与产出比分别达到1.73、1.83和1.98,三种规模农户的纯收益比调整前分别增加1132.5元、2392.8元和3913.5元.表明农户肉羊生产系统是一个高投入、高产出的农牧生态系统,有较好的生态效益和经济效益.