大青叶中4（3H）喹唑酮体外抗H1N1型流感病毒的作用研究

目的：探讨大青叶中4（3H）喹唑酮体外抗H1N1型流感病毒的作用。方法：用MTT染色法测定大青叶中4（3H）喹唑酮通过不同加药方式对H1N1型流感病毒的体外抑制作用。结果：大青叶中4（3H）喹唑酮对H1N1型流感病毒具有明显的阻断作用和对细胞内病毒有抑制作用。结论：大青叶中4（3H）喹唑酮具有明显的体外阻止H1N1型流感病毒吸附到靶细胞和抑制H1N1型流感病毒增殖的作用。     

德本F1蓝本F1牛适应性分析研究

研究了德国黄牛和比利时蓝牛的杂种后代德本F1、蓝本F1牛在甘肃省陇东地区肉牛带的适应性能，主要包括生长发育、增重、抗病性和繁殖性能等因素。结果表明德本F1、蓝本F1牛在试验期内（0～12月龄）的各项指标均优于本地牛，对当地饲养条件和环境条件表现出了良好的适应能力，可以在当地推广应用。     

Responses of Components of Antioxidant System in Moongbean Genotypes to Cadmium Stress

Four genotypes (Pusa 9531, Pusa 9072, Pusa Vishal, PS‐16) of moongbean [Vigna radiata (L.) Wilczek] grown in earthen pots were treated with cadmium at 0, 25, 50, and 100 mg kg^?1 soil. Cadmium tolerance (CdT), the ability of a plant to maintain growth at high levels of cadmium (Cd), was calculated as the ratio of dry‐matter production in the untreated and the Cd‐treated soils. The moongbean genotypes showed a differential response to Cd concentrations; Pusa 9531 was identified as Cd tolerant, whereas PS 16 was Cd susceptible. To find out the physiological basis of these differences, we investigated the possible role of antioxidant (enzymatic and nonenzymatic) defense systems. Activities of superoxide dismutase (EC 1.15.1.1), catalase (EC 1.11.1.6), ascorbate peroxidase (EC 1.11.1.11), and glutathione reductase (EC 1.6.4.2) and the amounts of ascorbate and glutathione were monitored in the Cd‐tolerant and Cd‐sensitive moongbean genotypes. The results revealed the presence of a strong antioxidant defense system in the Cd‐tolerant genotype (Pusa 9531) for providing adequate protection against oxidative stress caused by Cd.     

Combined Effect of Zinc and Cadmium Levels on Root Antioxidative Responses in Three Different Zinc‐Efficient Wheat Genotypes

This work was undertaken to investigate the effect of zinc (Zn) nutrition on root antioxidative responses to cadmium (Cd) toxicity of three wheat genotypes differing in Zn efficiency. A hydroponic experiment was carried out in which two bread wheat genotypes (Triticum aestivum L. cvs. ‘Rushan’ and ‘Cross’) and one durum wheat genotype (Triticum durum L. cv. Durum) were exposed to three Zn²⁺ (10^?11.11, 10^?9.11 and 10^?8.81 μm ) and two Cd²⁺ (10^?11.21 and 10^?10.2 μm ) activity levels. ‘Durum’ showed the highest root sulfhydryl (‐SH) groups content and activity of catalase (CAT), ascorbate peroxidase (APX), and superoxide dismutase (SOD) and the lowest root membrane permeability among the studied wheat genotypes. In ‘Durum’, Zn nutrition increased root ‐SH groups concentration of seedlings in Cd‐free nutrient solution. In ‘Cross’, as Zn²⁺ activity increased from 10^?11.11 to 10^?9.11 μm , root ‐SH groups concentration was increased while decreased with increasing Zn²⁺ to 10^?8.81 μm . Cadmium increased root membrane permeability at both 10^?11.11 and 10^?9.11 μm Zn²⁺ levels. Activity of CAT and APX increased in roots of ‘Durum’ plants exposed to Cd at Zn²⁺ = 10^?9.11 μm and thereafter decreased with increasing Zn²⁺ activity. In contrast, CAT and APX activity in roots of ‘Cross’ and ‘Rushan’ genotypes exposed to Cd decreased by increasing Zn activity to 10^?9.11 μm and then increased at Zn²⁺ = 10^?8.81μm . The results showed an increase in activities of antioxidative enzymes in Cd‐treated plants, although this increase was dependent on the crop genotype and Zn levels in the media.     

金平县林产业发展探讨

金平县2007年林业产值为1．91亿元，占全县农业总产值的35％，是林业重点县．该县具有发展林产业的优势项目，包括橡胶种植业、竹藤产业、木本油料（油荼）业、核桃特色经济林产业、杉木珍贵用材林产业以及草果林下资源开发等．分析了林产业发展的有利和不利因素．进行了产业发展规划和布局．提出加快集体林权制度改革、加大资金投入、加强科技支撑、扶持龙头企业、组建专业合作组织等保障措施．     

植物中γ-亚麻酸合成关键酶——△^6-脂肪酸脱氢酶

γ-亚麻酸作为人体必需的不饱和脂肪酸，对人体的激素调节及脂肪酸代谢发挥着重要的生理作用。△^6-脂肪酸脱氢酶是多不饱和脂肪酸合成途径中的限速酶。本文介绍了不饱和脂肪酸γ-亚麻酸代谢途径中的关键酶△^6-脂肪酸脱氢酶的结构功能与目前△^6-脂肪酸脱氢酶的基因工程研究进展，并对其应用进行了展望，以期为利用基因工程手段生产γ-亚麻酸提供参考。     

SPSS在林业生产和科学研究中的应用实例解析

SPSS作为统计分析工具,具有数据管理、统计分析、趋势研究、制表绘图、文字处理等功能。本文从科技推广角度出发,结合典型实例介绍SPSS统计软件在林业生产和科学研究中的应用。     

可信计算系统（TCG）

本文叙述了可信计算系统的概念并提出对可信计算系统的不足和改进     

美国黑人英语语言特征在电影对白中的表现及分析

屡次被贴上“蹩足英语”标签的美国黑人英语（AAVE）在美国文化发展中所起的作用不容质疑，黑人英语作为黑人文化的源泉一直受到语言学家及社会学家的关注。文中围绕美国黑人英语中BE不变体、否定、嘲讽及黑人俚语运用等典型语言特征，以系列好莱坞经典黑人电影对白为素材，分析了美国黑人英语的“黑人味”。指出作为一种成熟的英语变体，美国黑人英语独特的语言体系及其蕴含的丰富黑人文化元素对研究美国多元文化的变迁具有重要意义。