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  • 1
    ISSN: 1433-044X
    Keywords: Schlüsselwörter ,“Marjolin Ulcus“• Kombinationstherapie • Fallbericht ; Key words Marjolin's ulcer • Combined therapy • Case report
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Summary The ,,Marjolin's ulcer” is a malignant lesion which is developed especially at chronic wounds after burn trauma. The latency from primary trauma to the malignant transformation is about 30 years. The lesion is more aggressive than other squamous cell carcinomas. We report on the combined radiation and surgical therapy of an 65-year-old patient with this lesion on the right hand and regional lymph node metastases. The extensive tissue defect after wide excision was reconstructed with a reversal radial forearm flap.
    Notes: Zusammenfassung Als„Marjolin Ulcus“ bezeichnet man maligne Transformationen chronischer Wunden insbesondere nach Verbrennungstraumen. Die Latenzzeit zwischen dem Primärtrauma und der malignen Transformation beträgt etwa 30 Jahre. Das„Marjolin Ulcus“ zeichnet sich durch ein aggressiveres Verhalten gegenüber anderen Plattenepithelkarzinomen aus. In einem Fall eines 65 jährigen Patienten mit der Läsion am rechten Handrücken und regionalen Lymphknotenmetastasen berichten wir über die kombinierte Strahlen- und chirurgische Therapie. Der ausgedehnte Weichteildefekt nach entsprechend breiter lokaler Exzision wurde mit einem retrograd gestielten A. radialis-Lappen gedeckt.
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  • 2
    ISSN: 1432-0533
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Summary The hypothesis of the viral etiology of certain neoplasms could recently be confirmed by a series of remarkable findings. It was due to the doubtlessly far reaching consequences of the detection of a tumor-producing substance in the starting material for the production of numerous vaccines (inactivated poliomyelitis-, measles- and adenovirus vaccines, attenuated poliovirus-vaccines), that the problem was examined as whether this substance may come into the vaccines or not. After the injection of suspensions of various tissue cultures into 1-day-old hamsters (cricetus auratus) sarcomas were found only in those groups of animals to which a large dose of viable SV40 had been administered. the rate of sarcoma incidence as well as the date of appearance depended on the dose of-SV40 injected. The distinct dose-dependance of the tumors induced by SV40, i.e. the fact that tumors only appear after injection of high doses of virus and then only in the immediate neighbourhood of the site of injection, suggests that the development of tumors is caused or at least favoured by a local stimulating effect of the injected viral material on the tissue. The nodular neoplasms of large size (chickenegg), the morphology of which is described in detail, are polymorphic sarcomas with spindle-like and round cell formations as well as with monstrous giant cells and distinct mitotic figures The formation of capsules and the simultaneous rapid growth of the tumor account for the prolonged regressive alterations; numerous anaemic necroses are present.
    Notes: Zusammenfassung Die Vorstellung von der Virusätiologie bestimmter Neoplasmen konnte in jüngster Zeit durch eine Reihe bemerkenswerter Befunde gestützt werden. Wegen der weitreichenden Konsequenzen, die die Entdeckung einer tumorerzeugenden Substanz im Ausgangsmaterial für die Herstellung zahlreicher Impfstoffe (inaktivierte Poliomyelitis-, Masern- und Adenovirus-Impfstoffe, Poliomyelitis-Lebendimpfstoffe) zweifellos hat, erschienen uns Untersuchungen zu der Frage angebracht, ob diese Substanz in die Impfstoffe übergehen kann. Nach Injektion von Suspensionen verschiedener Gewebekulturen in eintägige Goldhamster (Cricetus auratus) wurden nur in solchen Tiergruppen Sarkome gefunden, die eine größere Dosis vermehrungsfähigen SV40 erhalten hatten. Die Häufigkeit der Sarkome und der Zeitpunkt ihres Auftretens waren deutlich von der injizierten SV40 Dosis abhängig. Die ausgeprägte Dosisabhängigkeit der Tumorinduktion durch SV40, die Tatsache, daß Tumoren nur nach Injektion sehr hoher Virusdosen und dann nur in unmittelbarer Nachbarschaft der Injektionsstelle auftraten, legt die Vermutung nahe, daß die Tumorentwicklung durch lokale Reizwirkung des injizierten Virusmaterials auf das Gewebe ausgelöst oder zumindest stark begünstigt wird. Bei den knotigen, höckerigen Neoplasmen bis Hühnereigröße, deren Morphologie ausführlich beschrieben wird, handelt es sich um polymorphzellige Sarkome mit spindel- und rundzelligen Anteilen, mit monströsen Riesenzellen und ausgeprägten Kernteilungsfiguren. Die deutliche Kapselbildung bei gleichzeitigem schnellen Wachstum der Geschwulst erklärt auch die ausgedehnten regressiven Veränderungen: es bestehen zahlreiche anämische Nekrosen.
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  • 3
    ISSN: 1432-0533
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Summary A report is given on changes which appear remote from the site of injection in the CNS of hamsters (cricetus auratus) after SV40-injection on the first day of life. Animals without body tumors which had been injected with higher doses of SV40, showed changes of the plexus chorioideus in a frequency vastly exceeding that of sarcomas at the site of injection in the respective experimental groups. The changes in the plexus, moreover, appear noticeably later. These changes within the CNS can be considered as early stages, although the animals were sacrificed at a time when the maximal frequency of the appearance of body tumors at the site of injection had passed. They consist in hyperplasia of the plexus, which in some regions already corresponds to the diagnosis of a papilloma of the plexus. Regarding these virus-induced neoplasms one may speak of either a multicentric or multilocal origin. Their independence of origin from the administered SV40-dose can be explained by the assumption that the transport of the injected virus or of virus proliferated at the site of injection via viraemia will occur in that moment when a certain threshold concentration at the site of injection is reached or exceeded. A simultaneous injection of poliovirus possibly exerts an synergic effect on the oncogenous effect of SV40. These results seem to confirm the opinion that a virus vaccine may on no account contain an extraneous virus, — especially one of possible oncogenous activity.
    Notes: Zusammenfassung In der vorliegenden Studie wird über Veränderungen berichtet, die bei Goldhamstern (Cricetus auratus) nach Injektion von SV40 am 1. Lebenstag von der Injektionsstelle entfernt im ZNS auftreten. Tiere ohne Körpertumoren, die SV40 in höheren Dosen erhalten hatten, zeigten Veränderungen des Plexus chorioideus in einer Häufigkeit, die die Zahl der Sarkome an der Injektionsstelle bei den entsprechenden Versuchsgruppen weit übersteigt. Die Plexusveränderungen treten zudem erheblich später auf. Bei den Veränderungen am ZNS handelt es sich um Frühstadien, obwohl die Tiere zu einer Zeit getötet wurden, als das Maximum für die Häufigkeit des Auftretens von Körpertumoren an der Injektionsstelle überschritten war. Es sind Plexushyperplasien, von denen zu diskutieren ist, ob sie nicht stellenweise schon als Plexuspapillome anzusprechen sind. Bei diesen virusinduzierten Neoplasmen kann man von einem multizentrischen bzw. multiloculären Ursprung sprechen. Die Unabhängigkeit ihrer Entstehung von der injizierten SV40 Dosis kann durch die Annahme erklärt werden, daß ein auf dem Wege der Virämie erfolgender Transport des injizierten Virus (oder des an der Injektionsstelle vermehrten Virus) dann eintreten kann, wenn eine bestimmte Schwellenkonzentration an der Injektionstelle erreicht oder überschritten wird. Die gleichzeitige Injektion von Poliovirus hat möglicherweise einen synergistischen Effekt auf die onkogene Wirkung von SV40. Für die Praxis sollen uns diese Ergebnisse vorerst in unserer Meinung bestärken, daß ein Lebendimpfstoff auf keinen Fall irgendein Fremdvirus enthalten darf — insbesondere keines mit eventueller onkogener Aktivität.
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Calcified tissue international 67 (2000), S. 47-52 
    ISSN: 1432-0827
    Keywords: Key words: Bone formation — Bone resorption — Osteoporosis — Bone growth — Ovariectomy.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine , Physics
    Notes: Abstract. The present study was performed to evaluate possible interactions between estrogen and progesterone on peak cancellous bone mass. Ovariectomized (OVX) growing rats were treated with 17β-estradiol (4.8 μg/day), progesterone (4.8 mg/day), a combination of the two sex steroids, or with vehicle for 14 days beginning 7 days after OVX. The tibiae were removed for histomorphometric analysis of the proximal metaphysis. OVX and growth each resulted in net resorption of cancellous bone at a sampling site adjusted for longitudinal bone growth. Estradiol and progesterone treatment each antagonized bone loss by inhibiting the decrease in trabecular number. Estradiol increased but progesterone had no effect on trabecular thickness. Progesterone did not influence either osteoclast number or the resorption of the pretreatment fluorochrome label. Estradiol reduced osteoclast number and inhibited label resorption, the latter change being accentuated by combination treatment. Estradiol reduced and progesterone enhanced the mineral apposition and bone formation rates. The results indicate that estradiol and progesterone have independent activities on cancellous bone turnover during growth. Whereas estradiol reduced bone turnover, progesterone had a stimulatory effect on bone formation. These findings suggest that progesterone has a role in establishing and maintaining peak cancellous bone volume during growth.
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  • 5
    ISSN: 1435-2451
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
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  • 6
    Electronic Resource
    Electronic Resource
    Springer
    The European physical journal 20 (2001), S. 63-70 
    ISSN: 1434-6052
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract. Nuclear effects due to the presence of spin-1 isosinglet 6-quark clusters in the deuteron on the extraction of both spin-independent and spin-dependent neutron structure functions are investigated. The x-dependences of the 6-quark cluster structure functions are estimated by using a perturbative QCD (pQCD) dimensional counting rules. Within this framework, the ratio of the deuteron structure function to the free nucleon structure function can be well described. We find that the nuclear effect on the extracted spin-dependent neutron structure function is very different from that on the spin-independent neutron structure function. The effect enhances the Bjorken sum by about 10%, whereas it decreases the Gottfried sum by about 7%. The formalism for calculating nuclear effects is further used to evaluate the spin-dependent structure function of the $^3$ He nucleus and a good self-consistent check is obtained.
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  • 7
    Electronic Resource
    Electronic Resource
    Springer
    The European physical journal 16 (2000), S. 657-664 
    ISSN: 1434-6052
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract. The flavor and helicity distributions of the $\Lambda$ and $\bar{\Lambda}$ hyperons for both valence and sea quarks are calculated in a perturbative QCD (pQCD) based model. We relate these quark distributions to the fragmentation functions of $\Lambda$ and $\bar{\Lambda}$ , and calculate the z-dependence of the longitudinal spin transfer to $\Lambda$ and $\bar{\Lambda}$ in lepton deep-inelastic scattering (DIS). It is shown that the spin transfer to the $\Lambda$ is compatible with the first HERMES results at DESY, and further tests are suggested. We also make predictions for the z-dependence of the $\Lambda$ and $\bar{\Lambda}$ longitudinal polarizations in neutrino (antineutrino) DIS processes. We investigate the sea contribution to the fragmentation functions, and we test a possible scenario where the sea quarks in $\Lambda$ (or the sea antiquarks in $\bar{\Lambda}$ ) are negatively polarized, whereas the sea antiquarks in the $\Lambda$ (or the sea quarks in $\bar{\Lambda}$ ) are positively polarized. The asymmetry of the polarized fragmentation functions of the sea quarks and antiquarks to $\Lambda$ and $\bar{\Lambda}$ provides a way to understand the different behavior between the $\Lambda$ and $\bar{\Lambda}$ spin transfers observed in the recent E665 experiment at FNAL.
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