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S Nii 《Journal of electron microscopy》1992,41(6):414-423
This review is concerned with comparative electron microscopic observations of in vitro cultured cells infected with twelve kinds of herpesviruses including six human herpesviruses. Morphological differences in intranuclear particles with cores of low density among these viruses mainly due to inherent differences in the ultrastructure of particular viruses, the morphological variety of intranuclear particles of herpes simplex virus due to their different developmental stages, and unusual structures observed in cells infected with some herpesviruses are described. Viral envelopment relevant to the final step of maturation of herpesviruses and their egress from infected cells are discussed. 相似文献
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中枢神经细胞瘤的超微结构观察 总被引:1,自引:0,他引:1
应用光镜检查及免疫标记,对2例中枢神经细胞瘤进行电镜观察.结果显示,中枢神经细胞瘤在电镜下具有一定的结构特征:瘤细胞间可查见桥粒样结构;胞质内有神经分泌颗粒和哑铃状致密核心颗粒;胞突内有丰富的微管和囊泡状结构.在外科病理诊断中,中枢神经细胞瘤难以与少突胶质细胞瘤、透明细胞室管膜瘤等肿瘤鉴别.电镜检查对鉴别诊断有比较重要的意义.肿瘤细胞胞突内的微管和囊泡、胞质内的神经内分泌颗粒等超微结构与免疫组织化学标记一致,同时也提示肿瘤起源于神经元细胞. 相似文献
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Electron microscopic visualization of actin filaments in the early embryo of Drosophila melanogaster: the use of phalloidin and tropomyosin 总被引:3,自引:0,他引:3
Various specimen preparations for thin-section electron microscopy were tested to better preserve and visualize actin filaments in the cortex of the early embryos of Drosophila melanogaster. When embryos were treated with phalloidin prior to fixation, many actin filaments were observed in their cortex comparable to the staining with fluorescently labeled phalloidin in light microscopy. Then we used various fixatives containing phalloidin. As far as we examined, actin filaments were best preserved in the specimen fixed with 2.5% glutaraldehyde, 2% paraformaldehyde in 0.1 M sodium phosphate buffer or in 0.1 M PIPES buffer (1 mM EGTA and 1 mM MgCl2) containing 10 microM phalloidin and 0.1% saponin. When embryos were glycerinated and then treated with tropomyosin before fixation, actin filaments were well visualized as thicker, uniform-sized filaments, though the number of filaments decreased probably owing to glycerination. This suggests that, like heavy meromyosin and its subfragment-1, this protein may protect actin filaments from being disrupted by chemical fixation. Using these improved fixation procedures, we successfully examined the distribution of actin filaments in the Drosophila embryo cortex during cellularization. These methods may be applicable to stabilize labile actin filaments in other types of cells. 相似文献
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应用透射电镜对从患"爬蜂病"的蜜蜂体内分离到的螺原体(Spiroplasma meilliferum CH-1)在不同生长繁殖时期的超微形态结构进行观察和比较,并在低渗条件下对螺原体的细胞骨架结构进行研究。结果表明:螺原体在四个不同的生长时期呈现不同的形态学特征,尤以在对数生长期形态最为多样,除典型的螺旋特征外,还有串珠、出芽和分枝等结构,提示螺原体可能通过二分裂、多分裂、缢缩、出芽等多种方式繁殖。此外,本文在低渗条件下观察到螺原体菌体胞质内的微丝和微管样细胞骨架结构,为进一步研究螺原体的运动模式提供了重要技术途径。 相似文献
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沙眼衣原体(Chlamydia trachomatis,Ct),可导致沙眼、感染性致盲,且是引起泌尿生殖道感染等性传播疾病的主要病原体之一。本文利用常温常规电镜制样方法和电子断层成像技术,体外对临床上分离得到的沙眼衣原体进行了研究。研究发现,此种衣原体在发育过程中,胞质发生了一系列的变化,首先RB胞质浓缩变小形成具有类核的IB,随后发育成高度致密且体积较小的EB。伴随此过程,膜也发生了变化:首先RB的膜易皱缩,EB的膜则较坚固;其次RB发育成EB时,多余外膜会形成囊泡;此外,其外膜结构随着RB发育为EB而变厚并更稳定。 相似文献
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Osawa T Ishida K Onodera M Feng XY Hayashi S Nozaka Y 《Journal of electron microscopy》2002,51(5):341-345
Collagen fibrils run in parallel in the endoneurial space, forming fibre bundles. Spaces are evident between these bundles when examined by transmission electron microscopy (TEM). However, the procedures for TEM include chemical fixation, dehydration and embedding, which may cause morphological changes in the specimens. Ultracryo thin sectioning procedures may avoid the artefacts caused by these procedures. An examination of ultrathin frozen sections revealed that the endoneurial space was completely filled with collagen fibrils, with little space between the fibre bundles. These results suggest that the dehydration and/or embedding procedures cause shrinkage of the specimen, resulting in the appearance of a widened space in the endoneurium. Therefore, the widened space between the bundles of collagen fibrils may be a technical artefact. 相似文献
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人胃癌组织中肽能神经支配的电镜研究 总被引:1,自引:0,他引:1
应用电镜研究手术切除人胃癌组织中肽能神经的支配。取免疫组化显示肽能神经纤维阳性部位胃癌组织制作超薄切片。电镜观察结果表明在胃癌细胞之间可以找到与之相邻或直接接触的无髓鞘末梢神经纤维。二者之间仅以Schwann氏细胞鞘膜以及基底膜相隔 ,在一些神经纤维剖面之间还可以查见少数含透明小泡和致密核心小泡的膨体。少数电镜视野中可查见无髓鞘末梢神经中呈现神经肽免疫组化阳性的神经纤维剖面。研究结果提示肽能神经纤维可能通过其分泌的神经肽对肿瘤的生长和分化起调控作用 相似文献
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单纯疱疹病毒 (herpssimplexvirusHSV)是人类重要的致病病毒之一 ,在人和动物中有广泛感染 ,皮肤单纯疱疹是其中一种。HSV有两种类型 ,HSV Ⅰ型和HSV Ⅱ型。以往对HSV Ⅱ形态学的研究在体外培养和动物实验方面较多 ,而对人先天性皮肤HSV感染的超微形态学研究还未见报道[1] 。本文对一例新生儿 (全身皮疹待查 )皮肤活检组织进行超薄切片、透射电镜观察 ,为临床诊断提供形态学依据 ;同时 ,进一步观察人皮肤HSV感染的组织病理变化及形态特点 ;并对电镜在病毒性疾病诊断中的价值和注意要点进行了讨论。材… 相似文献
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添加适量稀土元素钇后,镁铝合金高温力学性能会得以改善.本文利用光学显微镜(OM)、X射线衍射仪(xRD)、扫描电子显微镜(SEM)和透射电子显微镜(TEM),对693K保温24h的Mg-9.0wt.%Al-2.2wt.%Zn-6.1wt.%Y铸态合金样品的微结构进行了研究.实验结果表明,显微组织相组成是基体α-Mg、晶界处γ-Mg17A12、晶胞内的Al2Y、Υ-Mg32(A1,Zn)49及Φ-Al5Mg11Zn4相.确定了Φ-A15Mg11Zn4相与αt-Mg基体间的取向关系是(10(10))α//(106)φ,[51053]α//[010]φ. 相似文献
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本研究对我院电镜室收集的12,332例肾活检标本进行透射电镜观察,对超微结构表现特殊有形结构或形成特殊形态沉积的肾脏病进行超微病理特点分析,根据电镜在其病理诊断中的作用分为三类:分别为决定性诊断作用、重要诊断价值和辅助参考作用。结果显示,肾组织内特殊有形结构形成的肾脏病占肾活检病例的1.65%,其中,以淀粉样变为最常见,其次为冷球蛋白血症肾损害。电镜检查对于大多数超微结构表现特殊有形结构的肾脏病的诊断具有重要诊断价值;尤其是对于早期淀粉样变、纤维样和免疫触须样肾小球病、致密物沉积病和Fabry氏病的诊断具有决定性诊断作用。 相似文献
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实验发现乙炔在氢气与氨气气氛中催化裂解产物完全不同,反应温度973K,氦气气氛下,乙炔在LaFeO3纳米催化剂上裂解为碳纳米管,平均管径为30nm;在氢气气氛中乙炔主要在热电偶上裂解为碳纤维,直径平均为600nm左右。实验在没有催化剂存在时,对乙炔直接热裂解进行了研究.结果表明在没有氢气条件下,乙炔很少积碳;随氢气量的增加乙炔在热电偶上的积碳量逐渐增加,沉积的碳均成纤维状结构,平均直径随氢气量的增加逐渐增大。在1073K氢气气氛下,乙炔裂解产物中发现了大量螺旋状结构的碳纤维,其直径为80~200nm,长度一般在几um~十几um。 相似文献
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