Scanning electron microscopic study on dendritic cells and fibroblasts in connective tissue.

Perfusion fixation and intravascular resin injection were used to study in situ the cells of superficial fascia (loose connective tissue) of the rat limb by scanning and transmission electron microscopy. These procedures enabled us to differentiate fibroblasts, representative cells of the connective tissue and so-called "dendritic cells," the other cellular constituent of the tissue, known as possible antigen presenting cells. "Dendritic cells" were amoeboid with some spatular processes by which the cells clung to the collagen fiber bundles. The fine structures characteristics of macrophages; they contained abundant primary and secondary lysosomes and expressed factor XIIIa in their cytoplasm. Fibroblasts, on the other hand, were attenuated, sheet-like cells whose edges were juxtaposed closely to collagen and elastic fibers, and were further anchored by microfibrils. The cells were usually interconnected to each other with gap junctions, thus producing a cellular network in the connective tissue.     

电镜技术在耳形态学研究方面的应用

自本世纪 30年代电子显微镜技术建立以来 ,特别是 5 0年代建立了生物组织超薄切片技术以后 ,病理形态学研究逐渐深入到亚细胞领域或分子水平。近 2 0年来 ,电镜技术在耳形态学观察、爆震性聋、老年性聋等方面开展工作 ,并取得一些成果 ,现分述如下。1 .电子显微镜技术建立和完善了内耳常规扫描电镜样品制备技术 ,在此基础上进行技术改进 ,能够同时用一侧颞骨制备完整的耳蜗和前庭两个囊斑及三个壶腹嵴的扫描电镜观察样品。获得了极佳的观察效果。由于内耳结构精细复杂 ,取出标本后极易受损变形 ,给制备透射电镜样品带来一定困难 ,我们在常规…     

Scanning electron microscopic study of the red pulp of ferret spleen

Scanning electron microscopy of the red pulp of ferret spleen showed areas of relatively wide splenic cord and rather poorly developed splenic sinuses of two different types. The inner aspect of most sinuses was covered with rod-shaped cells running in the longitudinal direction of the sinus. Stomata of these sinuses were recognized between the rod-like cells in a relatively regular lattice-like arrangement. The lining of other sinuses showed characteristics of the poorly differentiated sinuses, having a remarkable irregularity in form, size, and distribution of the lining cells and the stomata. The outer surface of the splenic sinuses was covered with attenuated reticular cell processes supporting the sinus. Sheathed capillaries which have a well-developed sheath structure were frequently found in the cordal area. Cordal capillaries were exclusively open into labyrinthine reticular tissue space of the cord with a funnel-shaped or a perforated saccular or ampullar terminal.     

316F不锈钢中MnS夹杂的电子显微学分析

本文利用透射电子显微术,研究了SUS 316F不锈钢中MnS夹杂的结构和缺陷,发现并确定了MnS中的一种(Cr,Mn,Ti,V)O氧化物颗粒所属物相,并利用扫描透射电子显微镜(STEM)结合X射线能量色散谱(EDS),对Mns和不锈钢界面及Mns和氧化物颗粒的界面进行了成分分析,表明在MnS和不锈钢界面处不存在贫Cr区,在部分Mns和氧化物界面存在一层厚度为10 nm以下的氧化硅非晶层.     

An improved procedure of electron microscopic in situ hybridization for detecting adenovirus DNA

Electron microscopic in situ hybridization (EM-ISH) is a useful method in determining the localization of a specific nucleic acid at the ultrastructural level. Since the EM-ISH protocol includes many steps, no standard protocol for EM-ISH is available yet. In this study, we optimized quantitatively the critical conditions with respect to embedding resin, nucleic acid labeling and hybridization reaction time, by using adenovirus-infected cells as the indicator cells. The optimal detection of an adenovirus-specific nucleic acid was obtained by overnight hybridization reaction on sections embedded in Lowicryl K4M resin. Random-primed-labeled probes improved the reactivity. At least 60% of virus particles in paracrystalline arrays was found to contain viral DNA. These arrays in adenovirus-infected cells are useful in evaluating quantitatively the efficiency of protocols of EM-ISH.     

游离细胞超快扫描电镜样品制备法

在游离细胞的扫描电镜样品制备方法中 ,需要解决的关键问题是如何使细胞均匀而又不重叠地分布于盖玻片上 ,同时在一系列处理过程中细胞不易脱落。用常规的方法进行处理 ,步骤繁琐 ,所用时间又长且在样品处理过程中细胞有丢失现象。我们用细胞沉淀器加微波辐射技术进行游离细胞快速扫描电镜样品制备 ,获得满意的结果 ,现介绍如下。材料和方法1 .主要仪器 :本实验所用微波炉的型号为ＷＢＬ 5 30 0 1型 (国营陕西商洛通达电器厂生产 ) ,工作频率 2 45 0ＭＨｚ ,最大输出功率为 5 30Ｗ ,微波辐射时在微波炉底盘一边放一个 5 0 0ｍｌ烧杯 ,内盛5…     

Scanning electron microscopic observation of immunohistochemically specified stromal cells following the NaOH maceration method

The present study introduces a method combining immunohistochemistry and a chemical digestion technique applied to scanning electron microscopy (SEM) observation of chemically characterized stromal cells in the myenteric layer of the monkey small intestine. The whole-mount preparation containing the myenteric layer was treated immunohistochemically using small colloidal gold and silver enhancements for detecting a certain type of stromal cell, followed by an alkali maceration method to remove extracellular matrices covering the immunohistochemically stained cells. This method permitted direct SEM observation of the stained stromal cells. Secondary and backscatter electron images clearly visualized the ultrastructure of the immunohistochemically-stained cells and the spatial distribution of the reaction products, respectively. It is suggested that the present method is useful for demonstrating the three-dimensional organization of the chemically specified stromal cells.     

改良游离细胞扫描电镜制样方法适用于凋亡细胞观察

利用常规游离细胞扫描电镜制样方法制备的凋亡细胞样品,镜下凋亡检出率较低,细胞容易脱落变形,不能满足观察要求。本文采用200μmol／L双氢青蒿素作用前列腺癌PC-3细胞48h,诱导细胞凋亡;通过改良的制样方法制样并观察凋亡细胞超微结构。结果显示,凋亡细胞和凋亡小体阳性率明显提高,细胞贴附紧密、分布均匀,凋亡细胞超微结构比透射电镜更直观形象。