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白蜡虫在寄主植物上的分布特征研究 被引量:12
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作者 陈晓鸣 叶寿德 +3 位作者 陈勇 毛玉芬 王自力 王绍云 《林业科学研究》 CSCD 北大核心 1997年第4期415-419,共5页
白蜡虫在寄主上的分布与方向和寄主枝条的位置有关,不同虫期分布特征不同。在定叶期,白蜡虫种群在方位上差异不太大,但雌雄虫在方位分布上有明显差异。种群数量分布依次为东(28.05%),南(26.55%),西(25.06%... 白蜡虫在寄主上的分布与方向和寄主枝条的位置有关,不同虫期分布特征不同。在定叶期,白蜡虫种群在方位上差异不太大,但雌雄虫在方位分布上有明显差异。种群数量分布依次为东(28.05%),南(26.55%),西(25.06%),北(20.34%),雌虫依次为东(32.16%),南(27.36%),北(20.34%),西(18.65%);雄虫依次为西(30.76%),南(25.84%),东(24.29%),北(19.1%);在枝条位置上,种群数量分布依次为基部(65.71%)、中部(23.95%)和梢部(13.18%)。在定杆期,雌虫定杆数量分布依次为梢部(49.11%)、中部(28.80%)和基部(21.09%),雄虫依次为中部(90.71%)、基部(7.00%)和梢部(2.29%)。 展开更多
关键词 白蜡虫 寄主植物 种群 分布特征 定叶分布
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Desiccation Alters the Stability and Distribution of Pea Seed_borne Mosaic Virus in Pea (Pisum sativum) Cotyledon Cells 被引量:2
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作者 张景凤 刘坤凡 +1 位作者 文玉香 王道文 《Acta Botanica Sinica》 CSCD 1999年第8期825-828,共4页
As a seed transmitted pathogen, pea seed_borne mosaic virus (PSbMV) not only replicates in embryonic cells but can also withstand seed desiccation. To understand the mechanism of PSbMV tolerance to seed desiccation, ... As a seed transmitted pathogen, pea seed_borne mosaic virus (PSbMV) not only replicates in embryonic cells but can also withstand seed desiccation. To understand the mechanism of PSbMV tolerance to seed desiccation, the authors compared the stability of viral coat protein (CP) and the distribution of viral particles in the cotyledon cells of pea (Pisum sativum L.) embryos collected before and after the dehydration process. Before dehydration, when the embryo was fresh and immature, degradation of CP was observed and a predominantly perinuclear distribution of viral particles in the cotyledon cells was evident. After dehydration, when the embryo was dry and mature, degradation of CP did not occur and the perinuclear viral distribution disappeared. Instead, aggregates containing PSbMV CP were found in the cytoplasm. Electron microscopy showed that these aggregates were composed of PSbMV particles. The formation of PSbMV particle aggregates is apparently triggered by seed dehydration and may be favorable to the virus survival in the desiccated embryonic cells. 展开更多
关键词 DESICCATION Pea seed Pea seed_borne mosaic virus
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Particle Image Velocimetry Experimental and Computational Investigation of a Blood Pump 被引量:2
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作者 Xiaochen Yang Xingmin Gui +3 位作者 Hui Huang Yongbin Shen Ziwen Yu Yan Zhang 《Journal of Thermal Science》 SCIE EI CAS CSCD 2012年第3期262-268,共7页
Blood pumps have been adopted to treat heart failure over the past decades. A novel blood pump adopting the rotor with splitter blades and tandem cascade stator was developed recently. A particle image velocimetry (... Blood pumps have been adopted to treat heart failure over the past decades. A novel blood pump adopting the rotor with splitter blades and tandem cascade stator was developed recently. A particle image velocimetry (P1V) experiment was carried out to verify the design of the blood pump based on computational fluid dynamics (CFD) and further analyze the flow properties in the rotor and stator. The original sized pump model with an acrylic housing and an experiment loop were constructed to perform the optical measurement. The PIV testing was carried out at the rotational speed of 6952±50 r/rain with the flow rate of 3.1 l/rain and at 8186±50 r/min with 3.5 l/rain, respectively. The velocity and the Reynolds shear stress distributions were investigated by PIV and CFD, and the comparisons between them will be helpful for the future blood pump design. 展开更多
关键词 Blood pump Particle image velocimetry Computational fluid dynamics
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