目的：比较研究水溶性多糖(FI0-c)及其氯磺酸修饰产物(FI0-c-S)对人炎症性细胞因子产生的影响.方法：应用氯磺酸修饰法对多糖进行化学修饰.用放射免疫分析法(RIA)及逆转录聚合酶
叶片作为绿色植物进行光合作用的主要器官,若是提前发生衰老,必将严重的影响作物的产量和品质。研究表明,如果正常成熟期功能叶寿命延长一天,理论上可使水稻增产2%,实际增产1%左右~([1])。因此,从分子水平和遗传水平上研究衰老的调控机制,克隆水稻早衰调控基因以及对其进行功能研究,并对早衰现象进行改良,能够有效地提高水稻的产量,改善稻米的品质。本研究中的早衰突变体esl11(early senesce
While idealized crisis response involves smooth coordination between relevant actors,friction between levels of govement and between the state and civil society
写人物,要善于写人物精神的独到之处,这是记叙文章的一个重要原则。自觉地运用这个原则,对改进人物报道,有一定的参考价值。一篇写人物的文章,如果对于任何人都可适用,那肯
The need to consider disaster risk reduction at the time of recovery is well-recognized.Viable disaster risk reduction measures should resolve the root causes o
The utility poles of an electric power distribution system are frequently damaged by wind-related disasters.This study notes that the wooden poles are particula
Seasonal precipitation changes under the influence of large-scale climate oscillations in the East River basin were studied using daily precipitation data at 29
2004-2005年在沈阳农业大学试验田，以玉米品种“富友一号”为试材，在不同量缓释尿素一次基施和普通尿素一次追施条件下，研究了不同施氮方式下玉米生长发育、产量及效益，旨在探讨
The 2014 Jure landslide in Sindhupalchok District,Nepal,caused significant loss and damage to ecosystems and livelihoods in the area.In the direct aftermath of
药用菊花具有疏风散热,养肝明目,解疔疮毒的功效。主要有“黄菊花”(产于杭州)、“白菊花”(产于安徽滁县)、“野菊花”三种。就滁菊来讲,栽培历史悠久,驰名全国,为传统的名