鸡传染性法氏囊病毒研究进展

传染性法氏囊病(Infection bursal disease,IBD)是由鸡传染性法氏囊病毒(Infectious bursal disease virus,IBDV)引起的鸡和火鸡的一种高度接触性传染病,给世界各国的家禽养殖业带来了巨大损失[1]。据调查,美国鸡群的血清阳性率几乎     

利用木质纤维素生产L-乳酸的研究

综述了L-乳酸的应用和利用木质纤维素生产L-乳酸的优点、方法与技术要点,简要介绍了利用木质纤维素生产L-乳酸的研究现状以及对其前景进行展望,以期为L-乳酸的工业化生产提供参考。     

提高浇注式沥青混凝土高温稳定性的改进设计

对浇注式沥青混凝土高温稳定性较差的原因进行了分析,在此基础上对其进行改进设计,提出高温稳定性较好的浇注式沥青混凝土材料设计方案。对于将浇注式沥青混凝土应用于我国钢桥面铺装具有一定的指导价值。     

发展沙棘生态经济兼用林 培育农民增收产业永续

胡锦涛总书记在延安视察退耕还林工作时,看到安塞县在生态建设中营造的沙棘林时指出：＂现在陕北经济主要靠能源,煤和石油是不可再生的,开采完了怎么办,从长远看,还是要立足本地土地资源优势,延长产业链,保证农民长期致富。     

南京文明养犬:营造全民参与的宣传氛围

随着全国犬类整治专项行动的有序推进,各地的犬类管理工作逐渐规范化、科学化。通过政府职能部门、行业协会、基层组织、广大市民的共同努力,在积极动员营造氛围、广泛宣传普及知识等方面取得了阶段性成果。但是,最终能否让养犬和不养犬市民的利益得到平衡,政府和群众对于犬类管理都比较满意,社会各界都拭目以待。为了倡导文明养犬的观念,普及科学养犬的知识,促进我国犬类管理工作水平的提高,本刊以策划、访谈的形式,撷取了各地犬类管理工作中的经验,社会各界对犬类管理工作的反响,仅供参考。     

Flower color chimera and abnormal leaf mutants induced by C heavy ions in Salvia splendens Ker-Gawl.

The effect of ¹²C⁶⁺ heavy ions bombardment on mutagenesis in Salvia splendens Ker-Gawl. was studied. Dose–response studies indicated that there was a peak of malformation frequency of S. splendens at 200 Gy. Abnormal leaf mutants of the bileaf, trileaf and tetraleaf conglutination were selected. Meanwhile, a bicolor flower chimera with dark red and fresh red flower was isolated in M1 generation of S. splendens. Random amplified polymorphic DNA (RAPD) analysis demonstrated that DNA variations existed among the wild-type, fresh and dark red flower shoots of the chimera. The dark red flower shoots of the chimera were conserved and cultivated at a large-scale through micropropagation. MS supplemented with 2.0 mg/L BA and 0.3 mg/L NAA was the optimal medium in which the maximum proliferation ratio (5.2-fold) and rooting rate (88%) were achieved after 6 weeks. Our findings provide an important method to improve the ornamental quality of S. splendens.     

转变施肥理念提升苹果质量

当前,陕西省果农普遍在果树地下管理上不知所措,显的很茫然.培训工作也常常忽视或躲避地下管理培训,果农对此知之甚少,施肥也就存在很大问题.土壤肥力下降,果品质量和产量下降,以早期落叶、腐烂为主的病害加剧.施肥是生产优质果品的重要环节,必须受到果农的重视.     

福建果树新害虫——桃小食心虫的研究

１９８７年福建首次发现桃小食心虫严重蛀害李果，是福建果树害虫新记录。１９９０－１９９３年的研究表明，该虫在福建永泰李产区１年主要发生１代，以老熟幼虫在土中结冬茧越冬。卵期７．７天；幼虫期长达１０个月左右；蛹期１３．４天；雌蛾产卵前期４．６天，产卵量８１．２粒；雌蛾奉命１１．４天，雄蛾９．７天。４月中旬为越冬幼虫出土盛期。４月下旬至５月上旬为成虫羽化盛期。５月上中旬为第一代幼虫孵化蛀果盛期。第一代少     

油菜品种抗蚜性动态的系统分析

作者系统研究了１２个油菜品种对３种油菜蚜虫的抗性动态，结果表明３种蚜虫在各品种上的累积存活率、平均发育历期和产仔动态均有明显差异；同时建立了品种抗性对３种蚜虫种群增长的干扰效应模型，分析了各品种的耐害补偿功能及自然感蚜特性。特别是本文提出的“累积存活率”指标，不仅能反映出品种抗性的动态变化过程，而且将种群的年龄结构与为害特性纳入其中，在衡量品种的抗虫性程度中更具有普遍的应用价值。     

Institution, Legislation and Policy Analysis of China’s Wetland Protection

Wetland protection is a complex issue. In the executive system of wetland preservation, the central government is the main body of policy formulation and implementation. Although China has taken many steps to protect wetlands, there are still some institutional, legal and policy problems in the area of wetland protection. This article presents an analysis of these factors. First, the authors state and analyze the major legal and management problems currently hampering wetland protection in China. Then the authors believe that in the future, new problems of wetland protection will arise. Given the following three major aspects of wetland protection in China： i.e., the policy, law and management systems, this article provides some relevant suggestions in the area of policies and management.