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  • 1990-1994  (5)
  • 1
    Digitale Medien
    Digitale Medien
    Diffuse leptomeningeal melanomatosis of the spinal cord: a case report (1993)
    Springer
    Acta neurochirurgica 121 (1993), S. 206-211 
    Details
    ISSN: 0942-0940
    Schlagwort(e): Leptomeningeal melanosis ; MRI ; peritoneal shunt ; arachnoid cyst
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Summary A rare case of diffuse leptomeningeal melanosis presenting with symptoms of spinal cord compression due to the presence of anterolateral arachnoid cyst and treated with Spetzler's drainage system is reported. The diagnosis of diffuse melanosis of the leptomeninges is rarely possible during life. In the present case MRI was of great help in the definition of the limits of the pathological process and the presence of the anterior compressing cyst. After laminectomy and a biopsy of the pathological tissue which achieved the histological diagnosis, an external drainage was inserted to reduce the cyst extension and to exclude the presence of melanocytes in the cystic fluid before a peritoneal shunt was placed. At 8 th month of follow-up the patient is doing well with a dramatic reduction of symptoms and a significant reduction of spinal cord compression. The diagnostic role of MRI and the relationship between leptomeningeal melanosis and arachnoid cyst are discussed.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01809277
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  • 2
    Digitale Medien
    Digitale Medien
    Muscle basal lamina as a grafting material for elongation of axons from rat brain (1991)
    Springer
    Acta neurochirurgica 109 (1991), S. 122-125 
    Details
    ISSN: 0942-0940
    Schlagwort(e): Axonal elongation ; central sprouting ; basal lamina ; nerve graft
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Summary Autografts of peripheral nerve or allografts of muscle basal lamina were inserted into the putamen-caudate complex of rats, with the outer end of the implant being sutured to the temporalis muscle. Elongation of central axons within the grafts, as revealed by the horseradish peroxidase retrograde labelling technique, did occur in the presence of basal lamina implants. With both types of grafting materials stained neurones exhibited a comparable distribution, being mainly found in the proximity of the central tip of the grafts. However, labelled cells in the presence of basal lamina were limited in number, compared with peripheral nerve autografts. Therefore, the usefulness of implants of muscle basal lamina into the central nervous system, in order to direct regenerating central axons toward distant target regions, is limited. This material might be suitable, as an alternative grafting material, in experimental models where avoidance of neurological impairment or size and length of the graft are crucial factors.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01403006
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  • 3
    Digitale Medien
    Digitale Medien
    Nuclear matrix-bound replicational sites detected in situ by 5-bromodeoxyuridine (1992)
    Springer
    Histochemistry and cell biology 98 (1992), S. 19-32 
    Details
    ISSN: 1432-119X
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Medizin
    Notizen: Summary The nuclear matrix was prepared in situ from Swiss 3T3 cells, which were synchronized by contact inhibition and serum starvation and pulse-labelled for very short periods of time with 5-bromodeoxyuridine (5-BrdU). For the first time 5-BrdU has been employed to demonstrate the association of newly synthesized DNA with a nucleoskeleton. Immunofluorescence analysis using a monoclonal antibody to 5-BrdU revealed five different intranuclear staining patterns at different stages of the S phase. These patterns were observed also in intact cells and did not change during the matrix preparation steps which involve extraction with 2M NaCl and DNase I digestion. Such an observation was also confirmed by spatial confocal microscopy studies. The intensity of lfuorescence, which was evaluated by cytofluorometry, increased to reach a maximum during mid-S phase and then decreased. Because no significant difference was found in the time to label residual DNA of different 5-BrdU staining patterns, this strongly suggests that a different number of replicons is activated at different stages of the S phase. These results strengthen the hypothesis that eukaryotic DNA replication occurs in close association with an insoluble protein nuclear skeleton, which determines the three-dimensional spatial organization of chromosome duplication.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00716934
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  • 4
    Digitale Medien
    Digitale Medien
    A combined ultrastructural approach to the study of nuclear matrix thermal stabilization (1992)
    Springer
    Histochemistry and cell biology 98 (1992), S. 121-129 
    Details
    ISSN: 1432-119X
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Medizin
    Notizen: Summary Using mouse erythroleukaemia cells and different ultrastructural techniques, the morphology was investigated of the nuclear matrix obtained after incubation at 37° C of isolated nuclei. If purified nuclei were heated for 45 min at 37° C, the final matrix exhibited well-recognizable nucleolar remnants, an inner network and a peripheral lamina. Without such incubation only the peripheral lamina was seen surrounding homogeneous, finely granular material. Similar results were obtained with both araldite-embedded and freeze-fractured nuclear matrices, although in the latter case the loose granular material was not evident. Observations of araldite-embedded, heat-treated nuclei revealed clumping of heterochromatin in small, very electron-dense masses with large interchromatin spaces. These ultrastructural aspects were even more striking in freeze-fractured nuclei. Cytochemical matrix analysis by osmium-ammine staining for nucleic acids and DNase-gold labelling for DNA localization demonstrated that also matrix residual nucleic acids, mostly RNA, are stabilized by heat exposure of isolated nuclei. The results demonstrate that the morphology of heat-stabilized nuclear matrix is not artefactually affected during the preparation for conventional electron microscopy and suggest a possible involvement of nucleic acids in the heat-induced stabilization of the nuclear matrix.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00717003
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  • 5
    Digitale Medien
    Digitale Medien
    Hepatitis B in children in Italy: Incidence and risk factors (1994)
    Springer
    European journal of epidemiology 10 (1994), S. 219-222 
    Details
    ISSN: 1573-7284
    Schlagwort(e): Children ; Epidemiology ; Hepatitis B ; Italy
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Abstract The objectives of the present report were to give a baseline picture of hepatitis B notification incidence rates in children before the campaign of mass vaccination for newborns and adolescents (12–13 years old), and to study the role of different risk factors. Data from a specific national surveillance system of acute viral hepatitis (SEIEVA, Sistema Epidemiologico Integrato dell'Epatite Virale Acuta) were used and acute hepatitis B cases were compared to acute hepatitis A patients with the case-control study method to estimate the associations with the considered risk factors. Since the system began, one hundred and sixty-three local health departments have joined SEIEVA covering 30% of the Italian population. The incidence of acute hepatitis B notifications among 0–14 aged children was 9 per 100,000 in 1985 and 1 per 100,000 in 1990. Such decline in incidence was observed in both the North and the South of Italy. Surgical interventions, dental therapy and household contacts with a HBsAg chronic carrier were found to be associated with acute hepatitis B. The point estimate of the odds ratio was 10 for the latter risk factor. Other preventive measures in addition to vaccination are needed to control the risk of hepatitis B infection and other parenteral diseases due to surgical intervention and dental therapy.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01730374
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