排序方式: 共有18条查询结果,搜索用时 31 毫秒
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目的 探讨C57/BL6小鼠海马发育及老化过程中的形态学变化规律.方法 采用光镜连续切片和体视学方法对不同发育阶段C57/BL6小鼠海马进行系统地形态学观察和定量分析.结果 E12d出现海马原基.E18d阿蒙角(CA)锥体层"C"形轮廓形成,齿状回(DG)颗粒层外臂外壳形成.出生后,CA逐渐发育成熟.P7d DG颗粒层外壳形成.P21d DG颗粒层内外臂厚度相当,出现亚颗粒层,直到15月仍存在.海马、CA、DG、CA各层体积及DG各层体积P7d前增长缓慢,P7~P14d快速增长,P14d后增长又减缓,3月后趋稳定.结论 小鼠海马E12d发生,3月基本发育成熟.老年小鼠海马体积无明显改变. 相似文献
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综合考虑液压气柱的张力-冲程非线性关系、液压气柱与立管之间的夹角以及平台-张紧器-立管之间的耦合关系,研究顶张式立管液压气动式张紧器的不同模拟分析方法。选取3种典型工况,对不同张紧器模拟方法下立管的动态响应进行仿真计算,分析比较不同模拟方法的科学性和适用性。结果表明:在顶张式立管分析过程中,张紧器的合理模拟至关重要,是否考虑液压气柱和立管之间的夹角对立管响应的影响不大;恒定集中力模型不能反映立管张力的变化规律,而且立管响应也存在较大差别,故不宜采用;线性模型可用于平台运动幅值较小的情况;非线性模型最能反映张紧器的刚度特性,且在极端载荷环境下尤为适用。 相似文献
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目的 观察C57/BL6小鼠海马发育老化过程中Bcl-2、Bax蛋白的表达变化.方法 取不同胚龄(embryonic day,E)、生后(postnatal day,P)日龄或月龄的小鼠海马,应用免疫组化及图像分析技术检测Bcl 2和Bax蛋白的表达.结果 E16 d~P7 d,海马CA区锥体细胞层和齿状回颗粒细胞层B... 相似文献
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In order to verify the effectiveness of electrolytic treatment on ships' ballast water,experiments are carried out by a pilot system in laboratory. The raw seawater and seawater with different concentrations of different algae are simulated as ships' ballast water. The algae in the raw seawater can be killed if it is treated by electrolysis with an initial residual chlorine concentration of 5 mg/L. If the seawater with one kind of algae (Nitzschia closterum, Dicrateria spp., or Pyramidomonnas sp.105cells/mL) is treated by electrolysis with an initial residual chlorine concentration of 5 mg/L, the alga can be sterilized. If the seawater with one kind of algae (Dunaliella sp., Platymonas or Chlorella spp.)is directly treated by electrolyzing with an initial residual chlorine concentration of 4 mg/L, the instant mortality changes with the concentration of different algae. However, after 72 hours, in all treated samples, there are no live algal cells found. 相似文献
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DANG Kun SUN Pei-ting XIAO Jing-kun SONG Yong-xin 《船舶与海洋工程学报》2006,5(4):58-61
In order to verify the effectiveness of electrolytic treatment on ships' ballast water, experiments are carried out by a pilot system in laboratory. The raw seawater and seawater with different concentrations of different algae are simulated as ships' ballast water. The algae in the raw seawater can be killed if it is treated by electrolysis with an initial residual chlorine concentration of 5 mg/L. If the seawater with one kind of algae (Nitzschia closterum, Dicrateria spp., or Pyramidomonnas sp.105cells/mL) is treated by electrolysis with an initial residual chlorine concentration of 5 mg/L the alga can be sterilized, If the seawater with one kind of algae (Dunaliella sp., Platymonas or Chlorella spp.) is directly treated by electrolyzing with an initial residual chlorine concentration of 4 mg/L, the instant mortality changes with the concentration of different algae. However, after 72 hours, in all treated samples, there are no live algal cells found. 相似文献
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防沉板是桩基式平台导管架部分的重要附属构件,随着桩基式平台水深增加和结构形式的复杂化,防沉板的设计要求也逐步提高,理念也在不断扩展。结合近年来若干工程项目的实际事例和摸索出的实践经验,在与浅海平台防沉板设计比较的基础上,针对深水导管架工程,对防沉板在不同基础条件下设计方法和结构形式要求,从几个方面进行了阐述,并对一些前沿手段和有技术争议的环节进行了讨论,旨在拓宽设计思路,满足深水工程不断发展的新要求,解决设计中的难点。 相似文献