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  • 1
    ISSN: 0942-0940
    Keywords: Elderly meningioma ; clinical feature ; prognostic implication
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary During the 5 years from 1987 to 1991, 89 elderly patients, aged 70 years and over, were admitted to departments of neurosurgery in Yamaguchi prefecture with meningioma. The clinical features and prognostic implications of meningioma in the elderly were assessed retrospectively. Seventy-eight (88%) of the 89 patients underwent surgery, which was a higher rate than has been previously reported. The length of clinical history was also shorter than in previous studies, and was partly due to the recent introduction of magnetic resonance imaging (MRI). The incidence of poor prognosis (severe disability, vegetative or dead) in the elderly and a younger group aged less than 70 years was 13% and 7%, respectively, but the difference was not statistically significant. In the surgically treated elderly group, age did not influence the patient's outcome. The factors affecting the outcome were pre-operative neurological deficit (p〈0.05), histological malignancy (p〈0.05), and multiple operations (p〈0.05). Twenty-seven of the elderly meningioma patients were in good physical condition with minimal neurological involvement. They underwent total removal of the tumour at the first operation, and the histological diagnosis was benign. Twenty-five of these 27 patients fell into the best outcome category. Therefore, age alone was not a factor preventing proper surgical treatment of meningioma in the elderly.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Acta neuropathologica 79 (1990), S. 686-688 
    ISSN: 1432-0533
    Keywords: Transferrin receptor ; Brain injury ; Edema fluid ; Immunohistochemistry
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Recent studies have demonstrated the presence of transferrin receptors (Tf-R) in the central nervous system. The present study of Wistar rats with experimentally induced brain injuries, using immunohistochemistry at the light microscopy level, demonstrated the presence of Tf-R in regenerated endothelial cells, reactive astrocytes and in other cells, probably macrophages. Although Tf-R were seen in proliferating cells, Tf-R were also observed in nonproliferating cells, many of them macrophages. The receptors perhaps bind transferrin in edema fluid and play an important role in lesion repair.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Materials and structures 23 (1990), S. 305-315 
    ISSN: 1359-5997
    Source: Springer Online Journal Archives 1860-2000
    Topics: Architecture, Civil Engineering, Surveying
    Notes: Abstract As part of the work of RILEM T/C83-CUS, a statistical survey on mechanical properties of recent Japanese steels was performed on the basis of mill sheet data collected from six major mill makers of Japan. As a major result, wide scatter bands of yield point strength were found; this caused higher yield ratios of supplied steels than those based on the specified lower limits of yield strength and tensile strength. A high yield ratio is not preferable for ductility design of steel yield strength and tensile strength. A high yield ratio is not preferable for ductility design of steel structures. Thus, the upper limit of yield strength or yield ratio should be specified for such design use.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Neuroradiology 33 (1991), S. 260-263 
    ISSN: 1432-1920
    Keywords: Primitive neuroectodermal tumor ; Leptomeninx ; CT ; MRI
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Primitive neuroectodermal tumor (PNET) without an obvious intraparenchymal mass lesion and with diffuse spread in the subarachnoid space is rare. We report such a rare case and discuss the computed tomography (CT) and magnetic resonance (MR) features.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Springer
    Journal of materials science 4 (1993), S. 569-574 
    ISSN: 1573-4838
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine , Technology
    Notes: Unerupted teeth were extracted from the mandibles of calves, and the enamel surfaces containing ameloblasts and cells of papilla layer were scraped off. Cells migrated from the fragments were transferred into culture flasks containing small bars of sintered hydroxyapatite, and the cultures were incubated long-term. Most of the cells showed a fibroblastic morphology, but some of the cells formed an epithelial cell nest. The fibroblastic cells grew steadily, but the epithelial cells showed poor growth. The fibroblastic cells formed multiple cell layers and were embedded in collagenous matrix containing type I trimer collagen. By 3 months, fibrous bands appeared on the surface of the cell layers and surrounded the bars of sintered hydroxyapatite. Such bands increased in size with incubation time. Mineral deposition was observed in the well-developed bands. The deposited crystals were found by the X-ray powder diffraction method to be hydroxyapatite; the Ca/P molar ratio of 1.49 was determined by the ICP method. These results indicated that cells of papilla layer have the capacity to mineralize in vitro in the presence of sintered hydroxyapatite.
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Springer
    Journal of low temperature physics 81 (1990), S. 19-29 
    ISSN: 1573-7357
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Studies of the dHvA effect have been made on NbO single crystals grown by a zone melting techniques and 13 separate frequency branches ranging from 5.2×106 G to 1.2×108G have been observed. To understand the origin of the dHvA frequencies, we have made a self-consistent band structure calculation. Most experimental frequencies are found to be assigned to the extremal orbits on the calculated Fermi surfaces. There is good qualitative agreement between experiment and calculation, but some quantitative discrepancies still exist. We also report some physical properties, i.e., electrical resistivity, superconducting transition temperature, and electronic specific heat, of this high-quality NbO crystal.
    Type of Medium: Electronic Resource
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