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  • 25.70.Np  (4)
  • Tumor suppressor gene  (2)
  • 25.70.Gh  (1)
Materialart
Erscheinungszeitraum
Schlagwörter
  • 1
    Digitale Medien
    Digitale Medien
    Springer
    Virchows Archiv 424 (1994), S. 357-360 
    ISSN: 1432-2307
    Schlagwort(e): Tumor suppressor gene ; p53 ; Macrophage ; Giant cell ; Cell cycle
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Abstract Accumulation of p53 has been reported in nearly all malignant human tumours. Macrophage derived giant cells of sarcoid granulomas in human lung tissue also show intense staining for p53 while normal alveolar macrophages remain unstained. Since sarcoid giant cells are not considered to be either pre-neoplastic nor to exhibit p53 gene mutations, two different physiological functions of p53 may be illustrated. Alveolar macrophages were isolated from rat lungs and cultured in vitro. Accumulation of p53 was observed by indirect immunohistochemistry after application of polyclonal rabbit serum directed against murine p53 (CM5). Antiproliferating cell nuclear antigen (PCNA) antibodies were used to study DNA synthesis. Most of the multinucleated giant cells derived from macrophages accumulated p53 in the cytoplasm, while only few nuclei were stained. PCNA was found in most giant cells nuclei. However, PCNA positivity was visible in few mononucleated macrophages. Isolated alveolar macrophages in vitro clearly divide and since nuclear division is a late event in the cell cycle, p53 may be involved in G1/S-control and in other cell-cycle-checkpoints between mitosis and cytokinesis.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 2
    Digitale Medien
    Digitale Medien
    Springer
    Der Pathologe 15 (1994), S. 321-330 
    ISSN: 1432-1963
    Schlagwort(e): Schlüsselwörter Lunge ; Tumorsuppressorgene ; Onkogene ; Krebsentstehung ; Key words Lung ; Tumor suppressor gene ; Oncogene ; Cancerogenesis
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Beschreibung / Inhaltsverzeichnis: Summary The recent results obtained from investigations based on molecular biological techniques have led to a better understanding of recurrent genetic causes important for the pathogenesis of tumors. Several genes have been identified as being involved in the development of cancer. In many cases, the activation of oncogenes or the inactivation of tumor-suppressor genes is the predominant reason for cancerogenic cell transformation. Functional dysregulation is frequently the consequence of mutations, resulting in an alteration of the primary structure of the DNA. As our understanding of the nature, function, and interaction of these genes evolves, new opportunities for early diagnosis, classification, prevention, and treatment of malignant tumors will arise. The present report summarizes the current molecular biological aspects of several oncogenes (erbB, ras, myc, raf, fos, jun, bcl, mdm 2, myb, kit CSF1R, met) and tumor suppressor genes (p 53, rb, mts) involved in lung-cancer development with respect to the pathology of lung tumors, including the importance of these genes as far as the clinical course of the disease is concerned.
    Notizen: Zusammenfassung Die Fortschritte der letzten Jahre, insbesondere auf dem Gebiet der molekularen Genetik, haben wesentlich zum besseren Verständnis der Genese und Progression von Tumoren beigetragen. Nach dem heutigen Erkenntnisstand besitzen morphologisch als tumorös charakterisierte Zellen unterschiedliche genetische Alterationen. Im Verlauf der Tumorprogression kann es zusätzlich zur Akkumulation weiterer genetischer Alterationen kommen. Nach den heute vorherrschenden Arbeitshypothesen sind für eine bösartige Entartung von Zellen 3–10, in der Regel unabhängige genetische Alterationen Voraussetzung. Die Veränderungen in der Erbsubstanz betreffen überwiegend solche Gene, die direkt oder indirekt das Wachstum, die Proliferation oder die Differenzierung der Zelle regulieren. Die für die Entstehung von Tumoren verantwortlichen Gene werden dabei in die Klassen der Onkogene und der Tumor Suppressor Gene oder Anti-Onkogene eingeteilt. Bei Onkogenen führt definitionsgemäß erst eine (Über-) Aktivierung des betreffenden (Proto-) Onkogens zu einer Entartung der Zelle – bei Tumor-Suppressor-Genen ist eine (Teil-) Inaktivierung des Gens Voraussetzung für eine Transformation der Zelle. Neben chromosomalen Abnormalitäten, die in der Regel größere Genomabschnitte betreffen und zum Teil bereits auf lichtmikroskopischer Ebene diagnostiziert werden, spielen bei der Genese und Progression von Lungentumoren gerade genetische Alterationen in Onko- oder Tumor-Suppressor-Genen eine zentrale Rolle. Die vorliegende Übersicht faßt Erkenntnisse über die Gene zusammen, die heute als Faktoren bei der Kanzerogenese von Lungentumoren Bedeutung erlangt haben.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 3
    ISSN: 1434-601X
    Schlagwort(e): 25.70.Np ; 27.50. + e
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract We have measured production cross-sections of the new neutron-rich isotopes58Ti,61V,63Cr,66Mn,69Fe,71Co and neighbouring isotopes that have been identified as projectile fragments from reactions between a 500 MeV/u86Kr beam and a beryllium target. The isotope identification was performed with the zero-degree magnetic spectrometer FRS at GSI, using in addition time-of-flight and energy-loss measurements. The experimental production cross-sections for the new nuclides and neighbouring isotopes are compared with an empirical parametrization. The resulting prospects for reaching even more neutron-rich isotopes, such as the doubly-magic nuclide78Ni, are discussed.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 4
    ISSN: 1434-601X
    Schlagwort(e): 25.70.Np
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract The longitudinal-momentum distributions of projectile fragments from 0.8 A GeV136Xe and 1 A GeV197Au projectiles impinging on targets of beryllium and aluminium, respectively, have been measured using the projectile-fragment separator FRS at GSI. Different momentum distributions have been found for two different classes of fragmentation processes: the abundant hot fragmentation with several nucleons evaporated from the prefragments, and the rare cold fragmentation with only protons removed from the projectile, but no nucleons evaporated. The data are compared to model calculations.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 5
    ISSN: 1434-601X
    Schlagwort(e): 25.70.Jj ; 25.70.Gh ; 27.90.+b
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract The fusion of the massive systems110Pd+104Ru and110Pd+110Pd was uniquely identified by observing the a decay of the evaporation residues. The observed distribution of the fusion cross section on the different evaporation-residue channels is in clear contradiction to calculations based on the compound-nucleus model. As a possible explanation the precompound evaporation of a particles is proposed.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 6
    ISSN: 1434-601X
    Schlagwort(e): 21.10.Ft ; 25.70.Np ; 27.40.+Z
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract At the projectile-fragment separator FRS of GSI, relativistic secondary beams of about 520 MeV/nucleon were produced by fragmentation of a primary beam of58Ni at 650 MeV/nucleon in a beryllium target. By means of aΔE—Bρ—TOF measurement, the fragments have been identified and their charge-changing probabilities in targets of CH2, C, Al, and Pb have been determined. We describe the results for the total charge-changing cross sections in this first paper, whereas a second article deals with the partial charge-changing cross sections. At the drip line, the measured charge-changing cross sections exhaust close to 100% of the total interaction cross sections as calculated with semiempirical models. The measurements at the proton drip line with low-Z targets indicate that only a very small increase of the cross sections may be observed, whereas the measurements with a lead target show that no significant increase of the total charge-changing cross sections is present which would be a hint for low-lying dipole strength. Our experimental data are compared to Glauber-type calculations.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 7
    ISSN: 1434-601X
    Schlagwort(e): 21.10.Ft ; 25.70.Np ; 27.40.+z
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract At the projectile-fragment separator FRS of GSI, relativistic secondary beams of about 520 MeV/nucleon were produced by fragmentation of a primary beam of58Ni at 650 MeV/nucleon in a beryllium target. By means of aΔE—Bρ—TOF measurement, the fragments were identified and their charge-changing probabilities in targets of (CH2) n , C, Al, and Pb placed at the exit of the FRS were determined. Whereas a first article dealt with the total charge-changing cross sections, we describe in this second article the element distributions of these secondary fragments, which are found to depend strongly on the isospin of the secondary projectile as well as on the target material. In the case of the lead target, the influence of the electromagnetic dissociation is clearly visible in the one-proton and two-proton removal channels. The preference for the formation of even-Z fragments is much more pronounced for exotic secondary projectiles than for projectiles close to stability. Calculations with a geometrical abrasion-ablation model allow to understand the global features of the experimental data. However, far from stability, the discrepancies between calculations and experimental data increase.
    Materialart: Digitale Medien
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