河南省食用菌科技推广存在的问题及对策   总被引：1，自引：0，他引：1  

侯军  段春燕  杜爱玲  谢清华  吴祖峰 《河南科技大学学报(农学版)》2001,21(3):184-185

综合分析了河南省食有菌科技推广中存在的生产经营缺乏宏观引导，科技推广存在自发性和盲目性，体制不协调和食用菌生产本身的不可控因素较多等问题，提出了加强宏观引导，微观调控，建立健全食用菌行业管理，食用菌龙头企业建设，开发建设规模生产基地等具体措施，为食用菌的产业化大发展提供了参考依据。  相似文献   

瞿麦治疗仔猪黄白痢的效果比较   总被引：4，自引：0，他引：4  

陈孟军 《四川畜牧兽医》2002,29(Z1):29-29

通过用瞿麦单味中药与庆大、链霉素抗生素治疗仔猪黄白痢的效果比较,表明中药瞿麦的治疗效果较好,治愈率达95%以上,明显高于庆大霉素、链霉素等西药的疗效(P＜0.01),是临床治疗黄白痢较理想的中药药剂.  相似文献   

用分子生物学方法鉴别检测动物源性饲料中的牛羊源性成分   总被引：10，自引：0，他引：10  

杨宝华  宗卉  林庆燕  俞火 《中国畜牧杂志》2002,38(1):3-5

为了防止海绵状脑病疫区和痒病疫区反刍动物源性饲料进入我国 ,非常有必要对贸易往来中的肉骨粉品种来源进行鉴定检测。我们采用分子生物学方法从动物源性饲料中鉴别检测牛、羊特异性线粒体DNA的片段 ,并用限制性内切酶SspⅠ对PCR产物进行酶切鉴定及DNA序列测定。该方法的灵敏度可达 0 .12 5 % ,具有灵敏度高、快速和特异性强的优点。  相似文献   

Changes in the glutathione thiol-disulfide status in wheat grain by foliar sulphur fertilization: consequences for the rheological properties of dough     

I. Tea  T. Genter  F. Violleau  D. Kleiber 《Journal of Cereal Science》2005,41(3):305-315

Storage proteins and glutathione in wheat play an important role in gluten network formation and can be modified by supplementation of nitrogen (N) and sulphur (S) in wheat plants. The glutathione thiol-disulfide status and its relationship to the molecular weight distribution wheat polymeric protein and dough rheological properties have been examined after different foliar S fertilizations (S derived from micronized elemental S and NS, a mixture of N urea and elemental S) applied at the post-anthesis stage. Changes in levels of reduced glutathione (GSH), glutathione disulfide (GSSG), polymeric protein-glutathione mixed disulfide (PPSSG) were analysed by reversed phase high performance liquid chromatography, during grain development using the wheat cultivars, Soissons and Trémie. During the grain desiccation phase, S supplementation (i) increased the GSSG/GSH ratio by 23–25% (ii) induced PPSSG accumulation, and (iii) decreased the formation of SDS-unextractable polymeric protein (UPP) and its molecular mass distribution. However, simultaneous N and S supplementation results in: (i) a decrease in PPSSG formation by 20–30% and (ii) an increase of UPP by 7–18% by enhancing both the branching of the aggregated proteins and their molecular weight. The mixograph parameters show that all forms of endogenous glutathione are linked to dough weakening and are negatively correlated with dough mixing tolerance, dough strength and consistency, while UPP is positively correlated with dough strength and consistency. These findings indicate that S nutrition influences dynamics of the glutathione forms in the grain and results in modification the degree of polymerization of storage protein. Thus both the changes in the form of glutathione and protein polymerization influence the rheological properties of dough.  相似文献   

杨、桦林抚育改造技术研究   总被引：1，自引：0，他引：1  

张怡春 《吉林林业科技》2005,34(6):36-39

通过对黑龙江省东部山区10个林业局、427块标准地、1712株解析木的调查研究，得到了杨、桦林的树高、胸径和材积生长曲线，并编制了杨、桦林的抚育间伐控制图。  相似文献   

宿根花卉的特点及其在园林中的配置   总被引：3，自引：0，他引：3  

任彩光 《河北林果研究》2005,20(4):411-413

根据宿根花卉种类繁多、色彩丰富、生长稳定、抗逆性强的特点,其在园林中的配置,宜于建花坛、花境,也可群植,与背景树相结合,还可作地被植物代替草坪,也可建单类花卉园.  相似文献   

南、北盘江流域（贵州部分）土地退化类型及机理   总被引：1，自引：0，他引：1  

周家维 《贵州林业科技》2005,33(4):6-10

在对珠江上游南、北盘江流域（贵州部分）调查的基础上，分析了该流域土地退化成因，原生生态系统的脆弱性只是导致土地退化的一个方面。而人为活动才是土地退化的主要因素。根据土地退化的成因、结果，将珠江上游南、北盘江流域（贵州部分）土地退化划分为：土壤侵蚀、石漠化、土地贫瘠、土壤污染、土壤破坏五种类型，并提出了退化土地的管理及恢复措施。  相似文献   

Grouped, stacked rods and tapeta lucida in the retina of Japanese anchovy Engraulis japonicus     

Kamonpan Awaiwanont  Wisnu Gunarso  Munefumi Sameshima  Seiichi Hayashi  Gunzo Kawamura 《Fisheries Science》2001,67(5):804-810

ABSTRACT: Morphology of the photoreceptor cells and tapetum of the Japanese anchovy Engraulis japonicus was studied by histologically and by chemical analysis. The Japanese anchovy has a duplex retina. The cones form parallel rows consisting of alternately placed long cones and bifid cones. Both types of cones are intimately associated and form triple units that are regularly spaced along the row of cones. The rods are grouped and stacked. This fish has a retinal tapetum lucidum composed of guanine and hypoxanthine. Three structures of the tapetum lucidum were recognized: platelet, diamond and rod types. Photomechanical changes include movements of the photoreceptor cells and the retinal tapetum. The retina of the Japanese anchovy is thought to be highly sensitive and well adapted to a dim light environment.  相似文献   

Analysis of the Impact of Alfalfa Forage Production under Summer Water-Limiting Circumstances on Productivity, Agricultural and Growers Returns and Plant Stand     

E. Takele  & R. Kallenbach 《Journal of Agronomy and Crop Science》2001,187(1):41-46

The trade-off between summer water conservation from alfalfa production and the effects on plant growth, agricultural crop value, and grower returns in the low desert area (Imperial, Palo Verde, Parker and Yuma Valleys of California and Arizona) was analysed using an experimental plot in the Palo Verde Valley. The purpose was to provide a basis for evaluating water conservation decisions and policies. Four summer dry-down periods (withdrawing water for a predetermined period) of 0 days (control), 35 days, 70 days, and 105 days were analysed. Our results show that whereas the various dry-down periods would provide water conservation ranging from 254 to 944 million m³, the region would experience agricultural income decline by US $16 to US $73 million. For growers, benefits of dry-down would be effective only if the water price exceeds US $0.045 m⁻³ in California and US $0.036 m⁻³ in Arizona. Also dry-down would have possible adverse effects in the following areas including declines in plant stand density, long-term productivity, service industry sales, employment and biological benefits of soil fertility and organic matter that is attributed by the alfalfa plant in which case agriculture's and growers monetary losses could increase.  相似文献   

怀孕后期感染PRRS病毒母猪所产新生仔猪的免疫反应   总被引：5，自引：0，他引：5  

李华  杨汉春  刘平黄  陈艳红 《中国预防兽医学报》2001,23(3):217-221

将PRRS病毒BJ－4株感染怀孕后期（约90天）的抗体阴性和阳性母猪，待自然分娩后，观察新生仔猪的免疫应答。结果显示，接种PRRS病毒BJ－4的母猪没有表现出明显的临床症状，没有出现流产死产。新生仔猪浦被子前血清中PRRS病毒核酸TR－PCR检测和ELISA抗体阴性，哺乳后特异性抗体出现，5－6周母源抗体逐渐下降；20日龄猪瘟疫苗免疫后疫苗抗体维持时间短，仔猪在40日龄后进入野毒感染的危险期。RT－nested PCR检测血清中PRRS病毒核酸和易感仔猪病毒特异性抗体监测的结果提示仔猪群内可能存在水平传播。流式细胞术检测外周血淋巴细胞亚群发现CD3^ 细胞减少，CD4^ 细胞显著下降，CD8^ ，CD4^ CD8^ 和SLA－DR^ 表达细胞升高。以上结果表明在感染后病毒能够长期持续性存在，猪场内新生仔猪母源抗体逐渐下降后，通过水平传播受到感染，感染后免疫应答受到不利影响。  相似文献