阻燃剂森林草原防火的实验研究

通过对KM阻燃剂在林区边缘的草地植被防火实验过程中的研究,分析了KM阻燃剂的阻火性能,给出了KM阻燃剂的使用方法。实验表明:25%以上的KM阻燃剂在草地火灾发生时完全可以用于开设防火隔离带;对于低矮、稀疏的枯草,阻燃剂用量为5 m 2/L,高而浓密的枯草阻燃剂用量为2 m 2/L;为了有效发挥KM阻燃剂的作用,草地防火隔离带要连续,不得留有缺口,防火带宽度应该是枯草平均高度的5倍以上。      

普通小麦不同产量优势杂种与亲本苗期叶片基因表达差异的研究

为探讨小麦杂种优势形成的分子机理，本研究选用普通小麦品种系３３３８、６５５４和２４１０ＴＤ及其强优势杂种１（３３３８＊６５５４）和弱优势杂种Ⅱ（２４１０ＴＤ＊６５５４），利用ｍＲＮＡ差异显示方法分析了杂种和亲本幼苗叶片基因表达差异。结果表明：杂种与双亲间基因表达存在数量水平和质量水平的差异，但以量的差异为主。     

三叶草属牧草育种研究进展

进入20世纪80年代后,随着我国南方草地畜牧业的兴起,三叶草在人工草地建设中的作用越来越被重视。选育适宜不同地区种植的三叶草新品种工作开始起步。本文简要总结了国内外三叶草属牧草育种的概况,以期对今后三叶草属牧草的育种改良研究提供借鉴作用。     

Infectious bursal disease virus (IBDV) induces apoptosis in chicken B cells

The ability of infectious bursal disease virus (IBDV) serotypes 1 and 2, and the role of VP4 of both serotypes as well as the capacity of three IBDV intermediate serotype 1-specific vaccine strains to induce apoptosis in a chicken B-lymphocyte cell line, DT40, were investigated using the TUNEL technique. It was observed that IBDV serotype 1 infected the DT40 cell line and directly induced apoptosis. In contrast, the non-pathogenic serotype 2 neither infected nor induced apoptosis, but was able to reduce the serotype 1-induced apoptosis when the two viruses were present in combination. VP4 of both serotypes did not induce apoptosis. IBDV VP2 of serotype 2 induced apoptosis in the same proportion and intensity as VP2 of serotype 1. IBDV intermediate vaccines varied in their ability to induce apoptosis in the DT40 cell line, which was also decreased-delayed in presence of serotype 2 IBDV. We hypothesize that both serotypes compete for the same receptor in DT-40 cells, and suggest that IBDV-induced apoptosis is a multistep process involving virus replication, protein expression, and release of virions.     

园艺作物花芽分化的研究进展

阐述了园艺作物花芽分化的概念，综述了园艺作物花芽分化的过程、形态特征和分化过程中相关生理生化指标变化的研究进展，并展望其今后的研究趋势。     

加强科技成果转化 促进一产上水平——白朗县种植业科技成果转化项目的成效与主要经验

本文介绍了白朗县种植业科技成果的主要成效和主要经验，提出了提高粮油单产的建议与设想。     

开发绿色食品新产业培植农业新的增长点

简述开发绿色食品产业的重要性,提出湖北省加速开发绿色食品产业的目标与措施.     

Control of electron localization in molecular dissociation

We demonstrated how the subcycle evolution of the electric field of light can be used to control the motion of bound electrons. Results are presented for the dissociative ionization of deuterium molecules (D2 --> D+ + D), where asymmetric ejection of the ionic fragment reveals that light-driven intramolecular electronic motion before dissociation localizes the electron on one of the two D+ ions in a controlled way. The results extend subfemtosecond electron control to molecules and provide evidence of its usefulness in controlling reaction dynamics.