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  • 11
    Electronic Resource
    Electronic Resource
    Springer
    Journal of molecular medicine 27 (1949), S. 481-488 
    ISSN: 1432-1440
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Type of Medium: Electronic Resource
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  • 12
    Electronic Resource
    Electronic Resource
    Springer
    Journal of molecular medicine 31 (1953), S. 245-248 
    ISSN: 1432-1440
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Type of Medium: Electronic Resource
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  • 13
    Electronic Resource
    Electronic Resource
    Springer
    Journal of molecular medicine 58 (1980), S. 647-648 
    ISSN: 1432-1440
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Type of Medium: Electronic Resource
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  • 14
    ISSN: 1432-1440
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Summary In 82 dogs, both male and female, acute experimental pancreatitis was produced according to the procedure published byElliott, Williams andZollinger. Along with microscopic, histochemical and electron microscopic investigations, changes of enzyme and electrolyte concentrations as well as of the activity of proteinases were studied in order to pursue the pathways of pancreatic disorders. Besides, the examinations included studies on the effects of pancreatitis on the blood clotting mechanism and on changes of plasma volumes. It appears that, after an initial secretory obstruction and enlargement of the isthmic epithelium (“Isthmus blockade”), dilatation of acini and reflux of enzymes at the site of their production can be regarded as the most important lesions. Electron microscopic studies showed an irritation of the basal endoplasmatic reticulum at the beginning of the cellular lesion. In the further course, parapedesis through the cellular membranes can be observed, a phenomenon, the sequelae of which may be paralysis of preterminal or terminal vessels. Stimulation of functioning acinar cells obviously is followed by an “energetic” insufficiency, if ductal obstruction is maintained. When isthmus blockade continues, the initially reversible cellular lesion becomes irreparable, prodominantly because of vascular paralysis and consecutive tissue hypoxia. Enzyme displacement and local hypoxia form a circulus vitiosus which results in a tryptic necrosis. Chymotrypsin, trypsinogen, and trypsin could not be proved. Proteinases which were found effective at a neutral pH, however, appear to be responsible for the enzymatic auto-digestion of the pancreas.
    Notes: Zusammenfassung Bei 82 Hunden beiderlei Geschlechts wurde eine akute Pankreatitis in der Technik nachElliott, Williams undZollinger erzeugt. Pathologisch-anatomische, histochemische und elektronenmikroskopische Untersuchungen wurden den Befunden der Fermententgleisung, der Transmineralisation und Proteinasenaktivität gegenübergestellt, um die „Zündschnur“ des pathischen Geschehens zu verfolgen. Hiernach resultiert neben der „Sekretplombe“ eine Verquellung der Isthmusepithelien — eine „Isthmusblockade“. Die Folge ist eine Acinusdilatation und Enzym- wie Sekretrückstauung im Bereich der Produktionsstätte. Submikroskopisch läßt sich zeigen, daß am Beginn der Zellschädigung eine Irritation des basalen endoplasmatischen Reticulum besteht, in deren weiterem Verlaufe es zum Phänomen der Parapedese über die Zellbasis kommt, deren Folge die Paralyse der präterminalen und terminalen Strombahn sein kann. Die unter Sekretionsreiz gegen Sekretstauung arbeitenden Zellen geraten offenbar in eine „energetische“ Insuffizienz. Der zunächst noch reversible Zellschaden wird bei anhaltender Isthmusblockade durch Paralyse der capillären Strombahn und konsekutive Hypoxie dekompensierbar. Hypoxie und Fermententgleisung potenzieren einander und bilden einen Circulus vitiosus, dessen Folge die tryptische Nekrose ist. Chymotrypsin, Trypsinogen bzw. Trypsin waren nicht bestimmbar. Dagegen wurden im neutralen Bereiche wirksame Proteinasen nachgewiesen, die für die fermentative Autodigestion verantwortlich gemacht werden können. Weiterhin wird die Wirkung der Pankreatitis auf Blutgerinnung, Serumelektrolyte, Serumfermente und Plasmavolumen diskutiert.
    Type of Medium: Electronic Resource
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  • 15
    ISSN: 1432-1904
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Natural Sciences in General
    Type of Medium: Electronic Resource
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  • 16
    Electronic Resource
    Electronic Resource
    Springer
    Naturwissenschaften 43 (1956), S. 424-424 
    ISSN: 1432-1904
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Natural Sciences in General
    Type of Medium: Electronic Resource
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  • 17
    ISSN: 1432-2099
    Keywords: Key words Normal tissue ; Minipig ; Lung ; Heavy particles ; Carbon ionsIntroduction
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Physics
    Notes: Abstract  The response of pig lungs to irradiation with 12C-ions was assessed in two experiments to validate the procedures for heavy ion therapy planning at the Gesellschaft für Schwerionenforschung (GSI) and to explore their range of applicability. In both experiments, the target volume (spread-out Bragg peak, SOBP) was planned to be a 4 cm long cylinder with a diameter of 4 cm. Doses in the SOBP were prescribed to be equivalent to 5×4 Gy, 5×5.5 Gy and 5×7 Gy of x-rays in the first experiment, and to 5 fractions of 7 Gy and 9 Gy in the second experiment. The lung response in the first experiment was less than expected on the basis of earlier experiments with photons. Pneumonitis reaction and chronic fibrotic changes were observed outside the prescribed high-dose region. In the second experiment, the effects were more pronounced than had been expected on the basis of the first experiment. Changes were most intense in the high-dose region, but were also seen throughout the lung along the beam channel. Moreover, significant skin reactions were observed at the beam entrance site in all animals and – less pronounced – at the beam exit site in 3 of the 6 animals. In conclusion, the complex irradiation geometry of the pig lung, the changes of body weight between the two experiments, and insufficient accounting for a change in the relative biological effectiveness (RBE) computation led to substantial deviations of the observed reactions from expectations, the reasons for which could be identified in a subsequent analysis. The less pronounced lung reaction in the first experiment was due to an overestimation of RBE in a preliminary version of the algorithm for its determination. The extension of the fibrotic reaction resulted from the smear-out of the high-dose region due to density variations in tissue structures, respiratory movement, and limited positioning accuracy. The skin reactions at the entrance port reflect the different treatment geometry in the two experiments. The one unexplained observation is the mild skin reaction that was observed in the second experiment at the beam exit site.
    Type of Medium: Electronic Resource
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  • 18
    Electronic Resource
    Electronic Resource
    Springer
    Radiation and environmental biophysics 39 (2000), S. 147-152 
    ISSN: 1432-2099
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Physics
    Notes: Abstract  During the past few decades radiation research has developed into specialized sub-disciplines, ranging from basic physics and chemistry to tumor biology and experimental radiotherapy. Scientific issues as well as the techniques and methodologies applied are subject to diverging discussion. The annual scientific meetings of the German ”Gesellschaft für Biologische Strahlenfor-schung (GBS)” were established with the primary aim of allowing up-to-date transfer of current knowledge in any of the topics in radiation research and of promoting interaction between different research groups. This report provides a summary of the presentations at the third annual meeting which took place in 1999 in Dresden, Germany. The meeting particularly focussed on frontline research in radiation chemistry, modeling of radiation effects, dosimetry of non-ionizing radiation and unconventional radiation qualities, e.g., heavy ions or soft x-rays, stochastic radiation effects, DNA repair, and various aspects of radiobiological research of cells, normal tissues and tumors.
    Type of Medium: Electronic Resource
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  • 19
    Electronic Resource
    Electronic Resource
    Springer
    Naturwissenschaften 75 (1988), S. 631-634 
    ISSN: 1432-1904
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Natural Sciences in General
    Type of Medium: Electronic Resource
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  • 20
    Electronic Resource
    Electronic Resource
    Springer
    Langenbeck's archives of surgery 292 (1959), S. 552-588 
    ISSN: 1435-2451
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Type of Medium: Electronic Resource
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