483 resultados para 1118


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目的:为了探讨植物多糖硫酸酯(’&&()与)*+%$ 结合后,能否诱导,-./+#0 的)*+%$ 暴露出中和抗体的表 位,用它作为灭活疫苗以便诱导产生中和抗体。方法:用’&&( 结合的灭活,-./+#0 作为免疫原,与佐剂混和后,免疫 0(102 3 小鼠,制备出免疫血浆。用41-5( 检测血浆内抗,-./+ 特异性-)6 抗体的滴度,用改良的活细胞染色法中和试验检测 免疫血浆的抗,-./+#0 的中和活性。结果:从与’&&( 结合的,-./+#0 免疫组的动物获得的免疫血浆内抗,-./+ 抗体的滴 度(7 组:+8 # 9 +$" ;: 组:+8 # 9 +$" )比未结合’&&( 的,-./+#0 免疫组(;8 < 9 +$# )高,雌性小鼠的免疫血浆的特异性抗体滴 度比雄性的高& 倍。所有免疫组获得的免疫血浆均没有抗,-./+ 中和活性。结论:’&&( 与)*+%$ 相互作用不能诱导暴露出 )*+%$ 的中和抗体表位,但’&&( 可以增强机体免疫原的抗体反应强度,提示它可以作为免疫增强剂用于疫苗研究。

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Landslides occur both onshore and offshore, however little attention has been given to offshore landslides (submarine landslides). The unique characteristics of submarine landslides include large mass movements and long travel distances at very gentle slopes. Submarine landslides have significant impacts and consequences on offshore and coastal facilities. This paper presents data from a series of centrifuge tests simulating submarine landslide flows on a very gentle slope. Experiments were conducted at different gravity levels to understand the scaling laws involved in simulating submarine landslide flows through centrifuge modelling. The slope was instrumented with miniature sensors for measurements of pore pressure beneath the flow. A series of digital cameras were used to capture the flow in flight. The results provide a better understanding of the scaling laws that needs to be adopted for centrifuge experiments involving submarine landslide flows and gives an insight into the flow mechanisms. © 2010 Taylor & Francis Group, London.

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采用室内培养试验方法,研究了丙体六六六(γ-HCH)对斜生栅藻生长和生理生化的影响。结果表明,在γ-HCH浓度<0.2mg·L-1时对斜生栅藻生长有促进作用,在2mg·L-1时则表现为抑制作用,其对叶绿素的影响与对藻密度的影响一致,显示浓度-效应关系。γ-HCH对斜生栅藻的超氧化物歧化酶(SOD)的影响表现为,在0.02mg·L-1时达到峰值,然后下降,在2mg·L-1时其活性只有对照的38.18%。γ-HCH对斜生栅藻的膜脂过氧化的影响,在<0.02mg·L-1时变化不大,而在0.2mg·L-1和2mg

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节水农业研究中的土壤物理问题学术讨论会在西安举行中国土壤学会土壤物理专业委员会与西安理工大学水资源研究所共同组织的“节水农业研究中的土壤物理问题学术讨论会”于1994年10月19日至22日在西安理工大学召开。会上就节水农业研究中的土壤物理问题进行了广...

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建国 5 0年来 ,我国的耕作制度发生了翻天覆地的变化 ,耕作制度的改革有新的起点与突破 ,仅以占全世界 7%的耕地养活了占全世界 2 2 %的人口 ,取得了举世瞩目的成就。本文根据中国近几年耕作制度合理利用自然资源和社会资源 ,运用各种高新技术 ,实现农业持续、稳定和高效的增产 ,使农业生产各关联部门得以协调发展的实际 ,阐明了耕作制度的发展趋势 ,探讨了耕作制度在新形势下面临的挑战 ,研究了耕作技术发展的对策 ,可供同类地区研究者参考。

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以玉米淀粉为原料,在水介质中通过硝酸铈铵引发淀粉与丙烯酰氧乙基三甲基氯化铵(DAC)接枝共聚,制备系列含阳离子季铵基团的淀粉-DAC接枝共聚物,系统考察了反应条件对接枝共聚物接枝率(PG)的影响.