狮弓蛔虫卵形态的显微观察

为了以形态学方法准确鉴定狮弓蛔虫卵,试验采用光学显微镜和扫描电镜两种设备,详细观察了来自西宁市野生动物园的兔狲和雪豹粪便样本中的疑似狮弓蛔虫卵的外部形态特征。结果表明:光学显微镜下的虫卵形态符合已有的狮弓蛔虫卵形态,两株虫卵有卵细胞,卵壳厚且分层清晰,虫卵大小分别是65μm×55μm和70μm×60μm;扫描电镜观察超微形态,两株虫卵的卵壳表面没有明显独立于卵壳表面的网状外膜结构,但有大量杂乱、轻微的脊状凸起分布,这种外部结构与弓首蛔虫卵区别明显,可用于鉴别诊断。

小白鼠腘淋巴结淋巴窦的超微结构

我们观察了幼年小白鼠腘淋巴结淋巴窦的超微结构,窦壁由腔面向外一般出3层构成:(1)一层连续的内皮;(2)由一薄层细胞间质构成的基膜;(3)一层外膜网状细胞及其扁平的突起。内皮细胞核扁圆,异染色质细小,核仁不明显,胞质极薄,含粗面内质网极少,而有大量的吞饮小泡。细胞邻接处相互重叠或嵌合,有20nm宽的间隙相隔。有的地方可见不发达的细胞连接。当巨噬细胞或淋巴细胞穿越内皮时,可出现临时性间隙,内皮边缘与穿越细胞相贴。基膜由电子透明的无定形基质及细的胶原原纤维构成。外膜网状细胞的核异染色质较多,核仁明显,胞质丰富,含许多粗面内质网而很少吞饮小泡。外膜网状细胞之间常见0.5μm宽的间隙。在窦腔内有巨噬细胞、淋巴细胞及星状的网状细胞等。由于小白鼠腘淋巴结的淋巴窦小,故窦内星形的网状细胞很少,其超微结构特点,与外膜网状细胞及淋巴组织内的网状细胞相似,在突起的切面上,常见包有小束的胶原原纤维。巨噬细胞较多,形态不规则,常贴附于内皮细胞表面,核椭圆,常有凹陷,胞质丰富,含许多溶酶体。在取材前1h,于足垫注射中国墨汁的小鼠,巨噬细胞吞噬了大量粗的墨汁颗粒。本文认为,淋巴窦壁可能具有一定的屏障作用。

Establishment of antenna membrane states FEM on analogue method

On the basis of choosing the basic element as the bar and choosing the basic mesh as the triangle as well as supposing the conditions of the element, the membrane states of an antenna reflector were researched by the analogue method, because the membrane effect was not omitted during the ending deployment process of the radial rib antenna. The expressions of the bar element’s section area and density were obtained, while the expression of the stress state during the ending deployment process of antenna was attained. During the establishment process of the analogue method, the analysis method of the net shell structure was employed. Moreover, during the backward deduction of membrane stress, the continuation method was adopted. Because the expression of the membrane stress state can realize the analysis on the antenna membrane state, this research has great significance of theoretical direction to the normal operation of the space deployable antenna.