利用表面等离子共振技术检测牛奶中的朊蛋白

利用生物传感器——表面等离子共振传感器建立在活体动物中检测朊蛋白的方法,依据抗原—抗体特异性原理检测牛奶中朊蛋白。结果表明:应用表面等离子共振技术进行检测,1 h以内即可达到在缓冲液中标准最低检测限30 ng/mL的水平,牛奶样品的最低检测限是120 ng/mL。     

细胞色素C氧化酶的纯化及动力学性质研究

采用硫酸铵分级沉淀和CytochromeC -Sepharose 4B亲和层析 ,从牛心线粒体中纯化了细胞色素C氧化酶 (CytochromeCOxidase ,简称CCO ) ,其比活性为 1 7 88s- 1 ·mg- 1 ,聚丙烯酰胺凝胶电泳为一条带 ,血红素A (HemeaA)含量达到 1 5 4nmol/mg。纯化后的CCO具有典型的CCO特征 ,还原态CCO峰值出现在 60 5nm和 443nm ,氧化态CCO峰值出现在 598nm和 42 4nm。CCO的稳态动力学参数Vm1、Km1、Vm2 、Km2 分别为 1 42s- 1 、 0 53μmol/L、 2 71s- 1 、 1 81 μmol/L。     

世界性恶性杂草——紫茎泽兰研究的历史及现状

\t\t\t\t\t目的\t\t\t\t\t为了明确斜纹夜蛾取食紫茎泽兰对其生长发育和繁殖的影响。\t\t\t\t\t\t\t\t\t\t\t\t\t方法\t\t\t\t\t在室内分别利用紫茎泽兰和白菜叶片饲喂斜纹夜蛾幼虫,比较其生长发育、繁殖及存活差异。\t\t\t\t\t\t\t\t\t\t\t\t\t结果\t\t\t\t\t斜纹夜蛾可在紫茎泽兰上完成整个世代,但相较于其适宜寄主白菜,取食紫茎泽兰叶片导致其生长发育速率降低、历期延长、体重减轻,存活率、羽化率和繁殖力下降。取食紫茎泽兰的斜纹夜蛾各龄幼虫发育历期和蛹期与取食白菜叶片的斜纹夜蛾间差异显著(P<0.05),取食紫茎泽兰的幼虫其历期比取食白菜的延长10.26 d;取食紫茎泽兰的斜纹夜蛾1～6龄幼虫的体重显著低于取食白菜的同龄幼虫(P<0.05);蛹重比取食白菜的斜纹夜蛾蛹重低15.79% (P<0.05);紫茎泽兰上的斜纹夜蛾幼虫的累计存活率和羽化率分别为40.61%和83.33%,分别比白菜上降低31.96%和11.67% (P<0.05);同时,取食紫茎泽兰叶片可导致斜纹夜蛾成虫产卵期延长,单雌产卵量下降,并对其性比产生一定影响。\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t结论\t\t\t\t\t斜纹夜蛾取食紫茎泽兰虽不利于自身的生长发育,但能够完成整个世代,说明紫茎泽兰可以作为斜纹夜蛾的寄主植物,斜纹夜蛾具有成为紫茎泽兰天敌的潜力。\t\t\t\t     

黑茶在中国茶业史上的意义——郭红军著《黑茶通史——兼记民国茶事》述评

郭红军先生所著《黑茶通史——兼记民国茶事》一书,是一部研究中国黑茶的力作。其重要的学术价值在于阐述了黑茶生产和饮用的悠久历史及黑茶在中国民族史上所起过的重要作用,并介绍了中国各地域黑茶生产的独特技术和中国各地域黑茶的内销和外销。     

河北省城郊农业发展方向与模式研究

通过对城郊农业特点的分析,提出城郊农业应向二、三产业延伸,实行多功能开发,走观光采摘农业的路子。在实际工作中,通过坚持3个结合、做好5项工作,实现4个功能。     

Mechanism of RhoA on vascular reactivity following hemorrhagic shock in rats

AIM: To observe the mechanisms of RhoA on vascular reactivity following hemorrhagic shock (HS) in rats. METHODS: The superior mesenteric artery (SMA) in rats subjected to hemorrhagic shock was adopted to assay the vascular reactivity via observing the contraction initiated by norepinephrine (NE) with isolated organ perfusion system. Meanwhile, the effects of Rho kinase, myosin light chain phosphatase (MLCP), myosin light chain kinase (MLCK) on RhoA regulating vascular reactivity were observed. The effects of RhoA agonist U-46619 and inhibitor C3 enzyme on the activities of Rho kianse, MLCP, MLCK and phosphorylation of MLC20 in the vascular smooth muscle cells (VSMC) with hypoxia were also measured. RESULTS: As compared to control group, the cumulative dose-response curves of SMA to NE at 2 h after shock shifted to the right, the maximal contractions (Emax) of NE was significantly decreased. RhoA agonist U-46619 increased the vascular reactivity in the late period of shock. C3 enzyme abolished U-46619 induced the increase in the contractile response of SMA to NE. Rho kinase inhibitor Y-27632 decreased U-46619-induced the increase in the vascular reactivity, MLCP inhibitor calyculin further promoted the increase in the vascular reactivity. However, MLCK inhibitor had no effect on the U-46619-induced change of vascular reactivity. After hypoxia, the activities of Rho kinase and MLCK, and the level of MLC20 phosphorylation were decreased, MLCP activity was increased. RhoA agonist U-46619 increased the activity of Rho kinase and phosphorylation of MLC20, decreased the activity of MLCP, but had no effects on MLCK activity. CONCLUSION: RhoA plays an important role in the regulation of vascular reactivity following shock. The mechanism is closely related to regulating the activities of Rho kinase and MLCP, and increasing the phosphorylation of MLC20 in VSMC.     

加强专项管理加快专项预算执行进度

该文阐述了切实加强专项管理工作领导的重要性,强调要落实责任,加快专项预算执行进度,提出从业人员要加强学习与培训,努力提高业务素质,切实做好2007年、2008年修购项目验收工作及2010年修购项目实施的前期准备工作。     

菌根真菌菌剂防治作物土传病害潜力分析

 菌根真菌(mycorrhizal fungi,MF)对植物土传病害有一定的拮抗或抑制作用,能提高植物对土传病害的抗/耐病性。MF菌剂尤其是丛枝菌根真菌(arbuscular mycorrhizal fungi,AMF)及外生菌根真菌(ectomycorrhizal fungi,ECMF)菌剂作为一种生物防治剂在生产实践中的应用也是人们关心和感兴趣的问题。本文对MF菌剂防治土传病害的可能性、MF生态生理学、MF菌剂的生产、MF菌剂应用方法以及今后努力的方向进行了系统分析,并对MF菌剂防治土传病害的潜力和应用范围进行了评价。     

云南省水电开发中森林资源的保护与恢复对策

简要地介绍了云南省水能资源及开发的现状,从林业发展的角度分析了水电站开发对森林资源产生的正、负面影响,并提出水电开发中森林资源的恢复和保护对策.     

泰国政府投巨资收储农产品

以三色竹芋的侧芽为外植体,研究了三色竹芋不定芽诱导、增殖和生根的组织培养过程,并研究了6-BA浓度和继代次数对叶片颜色的影响。结果表明：以三色竹芋的侧芽为外植体,经过芽的分化、增殖和生根可获得批量组培苗;降低6-BA的浓度,减少继代次数,有利于保持叶片的颜色。