Study on Metsulfuron-Methyl Degradation in Simulated Wheat (Triticum Asetivum L.) Rhizospheric Soil with Penicillium sp. Inoculation

Weathering of abraded metallic Pb from bullets is a significant source of Pb contamination in shooting range soils. Weathering studies were performed using metallic Pb powder to simulate the fine-size fraction of metallic Pb found in shooting range soils. The effects of soil properties (moisture, organic matter-[OM] and pH) on weathering of abraded metallic Pb were examined by incubating a typical Florida soil for 5 to 12 days at 100% or 80% field capacity (FC) after spiking with 5% metallic Pb, after removal of soil OM at 100% FC, and after adjusting the soil pH to 4.8, 6.1 or 8.5 at 100% FC. The weathering products were examined using X-ray diffraction (XRD). Transformation of metallic Pb to secondary Pb-minerals was more rapid at 100% FC, in the presence of OM, and at lower pH. While little transformation of Pb occurred in the absence of soil OM and mostly litharge (PbO) was found at higher pH, both hydrocerussite and litharge formed at lower pH. A three-step weathering mechanisms of metallic Pb including oxidation, carbonation and dissolution was proposed. Addition of both calcium carbonate and phosphate rock was effective in reducing water-soluble Pb, though the effect was minimal after 11 weeks of incubation, attributing to the liming effect of metallic Pb added to the soil. While reducing soil moisture and organic matter and increasing soil pH slowed weathering of metallic Pb in a soil, the effect of calcium carbonate and phosphate rock on Pb solubility in soils highly contaminated with Pb was limited.     

基于参与性调查的密云水库周边农户对生态环境保护的认知与响应

通过参与性农户评估的调查方法对密云水库周边地区877户农户对信息来源途径、环境保护认识、生态补偿意愿,期望与机会成本、移民意愿与补偿等方面进行分析研究,并针对存在的主要问题提出了相应的对策建议。保护水库周边地区生态环境,需要通过拓展农户信息来源途径,大力普及生态知识,增强农户环境保护意识,引导农户依托当地的旅游资源和北京郊区的区位优势,发展生态环保的都市农业。     

新农村建设中的农村职业教育发展思考

介绍了我国农村职业教育的现状及面临的一些困境,分析了农村职业教育对新农村建设的意义,并提出了一些对策。     

小波分析在农用运输车振动信号处理中的应用

介绍了小波和小波包理论的基本思想 ,并用MATLAB语言编制了处理程序对农用运输车振动信号进行实例分析     

Protein extraction from rice (<Emphasis Type="Italic">Oryza sativa</Emphasis> L.) root for two-dimensional electrophresis

An efficient protein extraction method for two-dimensional gel electrophoresis (2-DE) from plant samples is usually challenging due to the low protein content and high level of interfering compounds. Proteomic analyses of rice (Oryza sativa L.) roots are limited by the lack of an efficient protein extraction method. To establish an effective protocol of protein extraction suitable for 2-DE analysis in rice roots, we evaluated three protein extraction methods (trichloroacetic acid [TCA]/acetone, Mg/NP-40/TCA, and tris-base/acetone). Our results showed that the Mg/NP-40/TCA extraction method had the highest protein yield and is the best resolution of protein separation among the three methods. The TCA/acetone method exhibited clear protein profiles and detected more protein spots with the highest intensity in the region of high Mr (above 45 kDa) than the other methods. However, this method was unable to detect proteins with low-Mr (less than 24.0 kDa). The Tris-base/acetone method showed the poorest resolution of protein separation. Our results suggest that the Mg/NP-40/TCA method was the most effective among the three methods and may provide enhanced proteomic information for rice and other crop roots.     

Guthrie法诊断苯内酮尿症最适条件的研究

试验以枯草芽胞杆菌ＡＴＣＣ６６３３株等材料，研究了诊断苯丙酮尿症（Ｐｋｌ）Ｇｕｔｈｒｉｅ检验的有关条件。其结果为，以２．００×１０５／ｍＬ菌孢子浓度，０．５％琼脂含量并制成３ｍｍ厚的Ｄｅｍａｉｎ培养基，最适宜Ｇｕｔｈｒｉｅ检验。     

吡啶羧酸铬对肉鸭后期作用效果初探

选用21日龄樱桃谷鸭36只，采用有重复对照试验，比较饲粮中添加0．2×10－6吡啶羧酸铬对肉鸭生产性能、屠体品质和血液生化指标的影响。结果表明，吡啶羧酸铬对增重、饲料转化率无显著影响，对屠宰率、胸肌率和皮脂率亦无显著影响；但使心重、血清总甘油三酯显著降低，血清总胆固醇、高密度脂蛋白胆固醇显著增加。     

知识经济与洛阳经济可持续发展

知识经济时代，洛阳经济可持续发展战略应该是：加大教育科研改革，全面实施“科教兴洛”战略，夯实知识经济的基础产业；扩大农业的知识资本投入量，促进农业产业化、企业化、资本化经营，实现农业知识化和现代化；得用新技术成果，对传统工业进行知识化改造，着力营造一批高新技术产亚，推动洛阳产业结构全面升级和优化。     

沈阳市渔业可持续发展对策

沈阳市改革开放以来，淡水渔业获得长足发展，淡水鱼产 量以年均２６．７％的速度快速增长，今年预计可达１０万吨，产值 ８亿元，除了当地销售二、三万吨外，有７０％远销黑龙江、吉林、 内蒙等东北市场，并出口韩国，沈阳市已成为东北地区最大的 淡水鱼生产基地。 “十五”末期沈阳市淡水鱼产量将达１４万吨，产值１１亿 元，分别比 ２０００年增长 ２７．２％和 ３７．５％。１．那么在“十五”期间乃至更长时期沈阳市淡水渔业如何可 持续健康、快速发展，主要举措是： １、继续加强商品鱼基地建设。突出市级２０个商品鱼基地 乡镇的建设…