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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    The European physical journal 231 (1970), S. 279-292 
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Deuteron scattering experiments were performed at the Erlangen Tandem Van de Graaff accelerator using a counter telescop with surface barrier detectors in conjunction with a PDP 7 on line computer. Elastic and inelastic differential cross sections were obtained from deuteron scattering from25Mg and27Al at excitation energies up to 3.4 MeV. Bombarding energy was 10.1 MeV. Angular distributions and integrated cross sections are discussed using collective models. It is shown, that the levels of25Mg can be well described by the rotational model (strong coupling model). The results for27Al allow a good description by the core excitation model (weak coupling model).
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    The European physical journal 242 (1971), S. 308-319 
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract For the reaction40Ca(d,α)38K differential cross sections for the excitation of the low lying states in38K have been measured at bombarding energies between 5 and 10 MeV. Total cross sections have been calculated using the statistical theory. It was found, that in the whole energy region the isotropic background of the angular distributions gives a good estimation of the compound contribution to the reaction cross section.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    The European physical journal 260 (1973), S. 35-45 
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Differential cross sections for 10 MeV deuterons, elastically scattered from24,26Mg and28,30Si have been measured. The scattering data have been analysed systematically in the framework of the optical model. It was found, that an uniform set of parameters, which is able to reproduce reasonably the angular distributions for the four nuclei, does not exist. Both the Mg distributions as well as both the Si distributions, however, can be described well with one set of parameters, respectively.
    Type of Medium: Electronic Resource
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  • 4
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The elastic and inelastic α-scattering cross section has been measured for the nuclei26Mg,28,30Si at 15 bombarding energies between 15.0 and 16.4 MeV. The energy averaged scattering cross sections can be described by an incoherent sum of contributions from direct and compound reactions. The direct reaction part has been calculated by the optical model or DWBA, the compound reaction part by a simple Hauser-Feshbach formula. From the analyses deformation parameters and spin cut-off parameters are obtained.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Springer
    The European physical journal 231 (1970), S. 177-192 
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A very sensitive microphone suitable for acoustic measurements in liquid helium is described. With the use of it both, the pressure amplitude of second sound and the amplitude of first sound radiated from the second sound transmitter (carbon layer heater) can be detected. By a special extension of the reciprocity theory the first sound pressure response of the microphone and the second sound transmitter response can be measured. The measured pressure signals of first and second sound are compared with the results of the two-fluid theory.
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Springer
    Cellular and molecular life sciences 26 (1970), S. 1342-1343 
    ISSN: 1420-9071
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Diazoacetylcholinebromide was used for affinity labelling of the cholinergic receptors of endplates in the mouse diaphragm. Under irradiation by light (Hg-high-pressure-lamp), irreversible depolarizing block of neuromuscular transmission developed. Acetylcholinesterase was influenced only by much higher concentrations, which demonstrates different localizations of the active enzyme center and the cholinergic receptor.
    Type of Medium: Electronic Resource
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  • 7
    ISSN: 1432-0649
    Keywords: PACS: 82.20.Kh; 82.40.Js; 82.20.Hf
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract. For the ultrafast photoinduced ring opening of cyclohexadiene the S1 state plays a central role, providing the possibility to rapidly decay to the ground state. In this paper we follow the path of a wavepacket propagating in the reactive coordinate space of the S1 surface. We present a detailed analysis of the corresponding electronic and nuclear motions. With the help of a projection method and a normal-mode analysis, the vibrational modes driving the reaction might be detected experimentally.
    Type of Medium: Electronic Resource
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  • 8
    ISSN: 1433-0458
    Keywords: Schlüsselwörter Mikrokerntest ; Feldkanzerisierung ; Biomonitoring ; Prävention ; Key words Micronucleus ; Assay ; Fieldcancerisation ; Biomonitoring ; Prevention
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Abstract A lot of different endogenous and exogenous factors are accused to promote squamous cell carcinomas in the upper aerodigestive tract. Main risk factors are the chronic tobacco- and alkohol consumption. The fact, that many patients develop syn- or metachronic carcinomas in this area was first described by Slaughter et al. 1953 and explained with the phenomenon of field cancerisation. Concerning to this hypothesis the whole mucosa of the upper aerodigestive-tract is premalignant damaged. In our study the micronucleus-frequency was determined as a biomarker for the genetic injury to prove the fieldcancerisation on the cellular level at 159 people (control-group, abuser, patients with HNSCC). Our results confirm the hypothesis of fieldcancerisation of the mucosa of the upper aerodigestiv-tract at strong tobacco- and alkohol consumers and patients with head and neck squamous cell carcinoma. Furthermore there is a highly statistically significant correlation between increasing micronucleus frequency and increasing tobacco abuse. As a final result of our study the micronucleus assay seems to be of good value to show a genotoxic damage in healthy mucosa at people with a high risk to develop HNSCC, but it's not usable to give any answer if and when such carcinomas arise.
    Notes: Zusammenfassung Unterschiedliche endogene und exogene Faktoren werden für die Entstehung von Plattenepithelkarzinomen des Oropharynx und Larynx verantwortlich gemacht. Die Hauptrisikofaktoren sind jedoch der chronische Tabak- und Alkoholabusus. Viele Patienten mit Mundhöhlen-, Rachen- oder Kehlkopfkarzinomen erkranken an syn- oder metachronen Zweitkarzinomen. Erklärt wurde dieses Phänomen erstmals von Slaughter et al. 1953 mit dem Konzept der Feldkanzerisierung. Hiernach wird die gesamte Schleimhaut des oberen Aerodigestivtraktes durch die oben genannten Schadstoffe als Ergebnis eines mehrstufigen Prozesses von genetischen Fehlern oder Mutationen prämaligne verändert. Statistisch gesehen steigt mit der Anzahl der Mutationen die Wahrscheinlichkeit des Eintretens spezifischer persistierender DNA – Modifikationen in einem für die Kanzerisierung wichtigen DNA-Abschnitt. In der durchgeführten Untersuchung wurde die Mikrokern (MK-)frequenz in der Wangenschleimhaut als Maß für die genetische Schädigung zur Erkennung der Feldkanzerisierung bestimmt. Die Ergebnisse unserer Untersuchung bestätigen die epidemiologischen Erkenntnisse des Zusammenhangs von Tabakabusus und einer Feldkanzerisierung im Kopf-Hals-Bereich. Ebenfalls zeigte sich ein hochsignifikanter Zusammenhang zwischen der Menge und Dauer des Tabakabusus und der Mikrokernbildung. Mit Hilfe der logistischen Regression konnte gezeigt werden, dass das relative Risiko bei rauchenden Probanden mit mehr als 0.0195 MK/Schleimhautzelle an einem Kopf-Hals-Karzinom zu erkranken, um das 8,04fache erhöht ist. Der Mikrokerntest scheint nach unseren Ergebnissen ein geeignetes Verfahren zu sein, im Sinne eines Biomonitorings Veränderungen am genetischen Endpunkt nachzuweisen; er erlaubt aber keine Aussagen, ob und wann es tatsächlich zu einer Entartung kommen wird.
    Type of Medium: Electronic Resource
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  • 9
    ISSN: 1433-044X
    Keywords: Schlüsselwörter Knochentransplantate ; Knochendesinfektion ; Knochensterilisation ; Osteoblast ; Biokompatibilität ; Key words Bone graft ; Bone desinfection ; Bone sterilization ; Osteoblast ; Biokompatibility
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Abstract All sterilizatian and desinfection procedures for bone grafts are different in regard to influence of bone graft features, which may influence the function of different cell types. We used an in-vitro approach to assess the influence of bone matrix, which was sterilized or desinfected, on osteoblastic activities in-vitro by simulating a cell-transplant-interface. Primary bovine osteoblast cell cultures were established from periosteum. Bone grafts specimens made of bovine cortical bone (Ø 15 mm, 300 μm thickness) were treated in 5 different ways: autoclaved, ethylen-oxid-sterilized, demineralized and low-temperature-plasma-sterilized (DEM-LTP), chemically sterilized (modified Tutoplast® method), and 80°C-temperature desinfected. The following cell function parameters were assayed: plating efficiency proliferation by measuring the DNA-content, and MTT-activity, soluble protein and extracellular matrix synthesis, alkaline phosphatase, and osteocalcin expression. All desinfected bone grafts were biocompatable with primary periosteal osteoblasts. Measured cell activities upon bone specimens showed better results than cells of the plastic surface control. The DEM-LTP-bone showed better results in comparison to other groups, and stimulated the proliferation and differentiation.
    Notes: Zusammenfassung Unterschiedliche Sterilisations- und Desinfektionsverfahren für Knochentransplantate unterscheiden sich bezüglich ihres Einflusses auf die Eigenschaften des Transplantats, die für den Remodelingprozeß von größter Bedeutung sind. In dieser Arbeit wurde der Einfluß der unterschiedlich sterilisierten und desinfizierten Knochenmatrix auf die Funktion primärer periosaler Osteoblasten in vitro untersucht. Folgende Desinfektionsverfahren wurden getestet: Autoklavierung, von uns modifizierte Tutoplast®-Methode, demineralisiertes Knochentransplantat mit anschließender Niedrig-Temperatur-Plasmasterilisation (DKM-NTP), 80°C-Thermodesinfektion und Ethylenoxidsterilisation. Isolierte bovine Osteoblasten wurden auf behandelten Knochenproben kultiviert. Folgende Parameter wurden geprüft: plating efficiency, Proliferation, DNA-Gehalt, MTT-Aktivität, Aktivität alkalischer Phosphatase, Proteinsynthese und Osteokalzin-Expression. Alle untersuchten Konchentransplantate waren biokompatibel mit primären periostalen Osteoblasten. Eindeutig toxischer Effekt wurde beim ethylenoxidsterilisierten Knoche nach 2tägiger Auslüftung nachgewiesen. Die Differenzierungsparameter zeigten deutlich höhere Werte in allen Testgruppen im Vergleich zur Plastikkontrolloberfläche, wobei die DKM-NTP-Gruppe stets die höchsten Werte aufwies und einen induktiven Effekt auf die Proliferation und die Differenzierung der Osteoblasten in vitro zeigte. Die Untersuchung wurde mit organspezifischen Zellen durchgeführt, die einen unveränderten Osteoblastenphäntyp aufwiesen. Die unterschiedlichen Knochendesinfektionsverfahren sind auf diese Weise zum 1. Mal getestet worden. Ethisch problematische Tierversuche zur Prüfung der Toxizität, der Biokompatibilität und der induktiven Eigenschaften von behandelten Knochentransplantaten können durch Verwendung dieser Methode erspart werden.
    Type of Medium: Electronic Resource
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  • 10
    Electronic Resource
    Electronic Resource
    Springer
    Inflammation research 1 (1970), S. 148-150 
    ISSN: 1420-908X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Type of Medium: Electronic Resource
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