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  • 1
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Histopathology 17 (1990), S. 0 
    ISSN: 1365-2559
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: This study was performed to answer the question: which parts of breast cancers are active in terms of proliferation as measured by the Ki-67 antibody and in terms of cell division as measured by the mitotic index. Forty-six breast samples were studied, including 34 breast cancers and 12 benign conditions. The intraductal component of infiltrating breast cancers showed a significantly lower proliferation index than the infiltrating component. The cells at the periphery of infiltrating tumour strands showed a higher proliferation activity than the cells in the core. These findings suggest that infiltration advances through preferential active growth of the cells at the invasion front.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Amsterdam : Elsevier
    Micron And Microscopica Acta 20 (1989), S. 37-40 
    ISSN: 0739-6260
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Electrical Engineering, Measurement and Control Technology , Natural Sciences in General
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Virchows Archiv 421 (1992), S. 179-188 
    ISSN: 1432-2307
    Keywords: Ageing ; Malnutrition ; Morphometry ; Myocardium
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary The effects of ageing and starvation on the rat myocardium were studied by morphometric methods. Since cardiac muscle is a tissue with a high level of anisotropy, methods based on the concept of vertical planes were used to describe quantitative alterations in the rat myocyte both at the cellular and ultrastructural level. During starvation rapid and important changes were noted, particularly in the transverse dimension of cells and organelles. The most striking change, however, was the immediate dilatation of the myocyte T-system, reflecting an adaptive interaction between the intra- and extracellular environment. At the same time exocytosis of intracellular components into the extracellular space of the T-system was observed. The ratio of mitochondria to myofibrils decreased progressively during starvation. Such a decrease, in general, may reach a point when cellular energy supply becomes compromised. A comparison between different regions of the heart showed no differences and it can be concluded that the morphological changes during starvation are the same, and equally distributed, in both ventricles. The changes described in the aged rat heart point in the direction of a hypertrophy of the aged myocyte. This leads to a lower ratio between surface and volume which finds its representation at the subcellular level in a more spherical shape of nuclei and mitochondria. Unlike what is seen in malnutrition, the mitochondrial/myofibril ratio is higher in the older rat. From the morphological point of view, the atrophy of malnutrition and the hypertrophy of ageing are opposed, but in both there is a change in the relationship of the myocyte to its environment which directly influences the substrate exchange capacity. This tends to protect the myocyte in starvation but jeopardizes the older cell.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Virchows Archiv 421 (1992), S. 189-192 
    ISSN: 1432-2307
    Keywords: Malnutrition ; Ageing ; Myocardium ; Microvasculature ; Morphometry
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary The modulating effects of ageing and malnutrition on rat myocardium were studied morphometrically with respect to the microvasculature. An increase in capillary density together with a decrease in capillary lumen cross-sectional area was noted during starvation. The important changes seen in the myocyte T-system were paralleled by a decreased diffusion distance for oxygen from the capillary lumen to the mitochondrion. The changes described in the aged rat heart point to an altered inter-relationship between parenchyma and vascularization with a lower capillary volume fraction and a greater diffusion distance from the capillary lumen to the mitochondrion; this is caused by hypertrophy of the aged myocyte. This reduction in capacity to exchange substrates is further reduced by the less developed T-system in the older myocyte.
    Type of Medium: Electronic Resource
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  • 5
    ISSN: 1432-2307
    Keywords: Cholesterol ; Foam cells ; Atherosclerosis Smooth muscle cells ; Endothelium von Willebrand factor
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract We investigated whether pre-existing subendothelial smooth muscle cell (SMC) accumulations in cholesterol-fed rabbits are transformed into foam cell plaques. Twenty-four rabbits received a standard diet supplemented with 2% cholesterol for 4 or 8 weeks. Six rabbits received a supplement of 0.3% cholesterol for 35 weeks. The aorta and other systemic and pulmonary vessels were studied by immunohistochemistry for smooth muscle cells SMC (α-SMC actin), macrophages (RAM11), cell replication (proliferating cell nuclear antigen) and endothelial cells (von Willebrand factor; vWF). Initially the foam cell plaques were composed exclusively of foam cells of macrophage origin (MFC). In more advanced lesions SMC and collagen fibres were also present, leading to a fibrous transformation of the plaque. Cell replication was mainly located in the MFC. The endothelial cells covering the plaques showed an increased immunoreactivity for vWF which was also deposited in the interstitium between the FC. Pre-existing subendothelial SMC did not transform into FC. The newly formed FC plaques remained clearly separated from the pre-existing subendothelial SMC. The development of the plaques can be attributed not only to monocyte recruitment but also to macrophage multiplication.
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Springer
    Virchows Archiv 385 (1980), S. 335-342 
    ISSN: 1432-2307
    Keywords: Sternberg-Reed cell ; Reconstruction
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary The relationship between mononuclear, multinucleated and multilobated Sternberg-Reed cells was studied by reconstructions done on serial sections 1–2 μm thick. The 21 cells so studied showed the following combinations: 7 were binucleated, but two nuclei were composed of two parts at certain levels; these nuclei we propose to call composite. 8 cells were mononuclear and had composite nuclei and 6 cells were mononuclear and had single nuclei.
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    Springer
    Virchows Archiv 391 (1981), S. 81-89 
    ISSN: 1432-2307
    Keywords: Thymus ; Non-lymphoid haematopoiesis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Non-lymphoid haematopoiesis in the thymus was studied in 33 cases ranging from 14 weeks gestation up to 15 months postnatally. All thymuses displayed focally granulopoiesis in the connective tissue septa and in the lymphoid tissue, where it was localized in the peripheral cortex and at the cortico-medullary junction. Within the lymphoid tissue the granulocytic series showed many precursor cells with large rounded nuclei. Their origin could only be identified by the naphtol AS D chloroacetate esterase stain. In cases with thymic atrophy these precursor cells were present in relatively large numbers. Within the connective tissue septa many granulocytes with nuclear segmentation were intermingled with precursor cells. The erythroid series were detected with an immunohistochemical method for demonstration of haemoglobin. The positively stained nucleated cells occurred mainly in nests mostly localized in the peripheral cortex. These precursor cells were usually found in different places from the granulopoietic cells. No megakaryocytes were found. With appropriate techniques non-lymphoid haematopoiesis can be demonstrated in the developing thymus and must be considered as an expression of normal growth.
    Type of Medium: Electronic Resource
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  • 8
    ISSN: 1432-0533
    Keywords: Menkes disease ; Copper deficiency ; Arterial elastic membranes ; Necroses ; Demyelination
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Two cases of Menkes disease belonging to different families are reported in order to illustrate different types of central nervous system involvement. In the first case which documents the sex-linked recessive inheritance, arteriographic studies have shown that the vascularization of the brain was severely impaired. Postmortem examination revealed lesions of the elastic membranes of large and medium calibre arteries, widespread and extremely severe necroses of grey and white matter with relative sparing of the territories irrigated by the vertebro-basilar system. The dendritic tree of the Purkinje cells was atrophied, somal sprouts were not found. Electron microscopy showed the mitochondria to be morphologically normal. In the second case, there was a bilateral demyelination predominating in the temporal lobes' white matter while arterial alterations and anoxic lesions were present but less prominent. The Purkinje cells were normal. Considering the role of copper as a co-factor for different enzymes, it is possible to explain many features of Menkes disease on the basis of a lack of copper (Danks et al., 1972a, b). Multiple elements play a role in the pathogenesis of the C.N.S. lesions: some alterations, such as the parenchymatous necroses, depend from circulatory disturbances related to arterial abnormalities; others, such as the demyelination, the dystrophic features etc., could be linked to various enzymatic deficiencies susceptible to interfere with postnatal myelination and differentiation of cell membranes as illustrated by the study of spontaneous and experimental animal diseases.
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    Springer
    Virchows Archiv 403 (1984), S. 27-40 
    ISSN: 1432-2307
    Keywords: Spleen ; Ellipsoids ; Morphometry ; Electron microscopy ; Lymphocyte traffic
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary A study of ellipsoids (EL) in the human spleen was done on 25 surgically resected specimens in order to assess the number of EL, their structure, the nature of the cuff cells and the problem of lymphocyte traffic through their wall. The results show that an average spleen of 200 g contains 1.6 × 107 EL. They are localized in a constant segment of the vascular tree, just at the transition of the penicillary arterioles into capillaries and they consist of a capillary (not an arteriole) surrounded by a cuff of cells. These cells are neither endothelial nor smooth muscle cells, display lysosomal activity and are considered as fixed specialized pericapillary cells capable of cytoplasmic expansion. Since their number is inconstant in different individuals and in different species they are considered to be dynamic histological structures. Because of the constant presence of lymphocytes in their walls we consider the EL to be a transit system for lymphocytes and the splenic equivalent of the high endothelial venules in the lymph nodes.
    Type of Medium: Electronic Resource
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