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  • 1985-1989  (7)
  • 1980-1984  (4)
  • 1920-1924
  • 1915-1919
  • Polymer and Materials Science  (9)
  • Electron microscopy  (2)
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  • 1
    Electronic Resource
    Electronic Resource
    Immunologische und elektronenmikroskopische Befunde eines ungewöhnlichen Falles von M. Whipple (1985)
    Springer
    Journal of molecular medicine 63 (1985), S. 176-183 
    Details
    ISSN: 1432-1440
    Keywords: Whipple's disease ; Electron microscopy ; Disturbed cellular immunology
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Whipple's disease is a curious disorder with the involvement of many organ systems, primarily gut, synovium and the central nervous system, characterized by the presence of numerous proliferating bacteria in tissue macrophages and other cell types. While clinically this disease entity has previously been defined by the classical triad of diarrhoea, malabsorption and weight loss, some patients do not show these features. In this report, a clinically unusual case of Whipple's disease is described presenting with high persistent fever, severe arthralgias and headaches, but without malabsorption, diarrhoea or weight loss. Nevertheless, the histological and electron microscopical pictures demonstrated the typical findings of intracellular micro-organisms along with the presence of bacteria in Schwann nerve cells, which has only once been described previously. Immunological findings before treatment demonstrated a decrease of T cells with the helper/inducer phenotype, and a concomitant rise in cells with the suppressor/cytotoxic phenotype, an elevation of “activated” Ia positive T cells and a significant reduction of T cell mitogenic responsiveness. Of special interest, after a successful treatment these immunological abnormalities shifted to normal with the exception of a still elevated number of Ia+ T cells. The discussion of this unusual case of Whipple's disease includes — besides possible cellular immunological abnormalities — genetic factors, especially since this patient was HLA-B-27-positive as was his son who is suffering from ankylosing spondylitis.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01732172
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  • 2
    Electronic Resource
    Electronic Resource
    On the ultrastructure of the gastric “borderline lesion” (1983)
    Springer
    Journal of cancer research and clinical oncology 105 (1983), S. 285-291 
    Details
    ISSN: 1432-1335
    Keywords: Borderline lesion ; Severe dysplasia ; Gastric precancerosis ; Electron microscopy ; Morphometric analysis ; Bleb formation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary The “borderline lesion” of the stomach (severe dysplasia of the protruded type) is nowadays considered to be a true precancerous lesion. Histologically, this lesion is characterized by a proliferation in the area of the glandular neck, combined with severe cellular atypia. Investigation by means of transmission electron microscopy reveals the structure of these cells to be very similar to the structure of cells of an intestinal-cell-type carcinoma of the stomach. In addition to signs for a loss of differentiation of the cells, such as the absence of rough-surfaced endoplasmatic reticulum, mucin granules, and of the polarity of the cells, remarkably frequently luminal bulges and “blebs” developed to various extents can be detected. Morphometric analysis is delineating the tendency of structural features of the borderline lesion to develop toward the gastric cancer cell. These irregularities might be expressions of the beginning of expansive growth and signs pointing to differentiation into malignant neoplasia.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00395760
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  • 3
    Electronic Resource
    Electronic Resource
    High temperature sulfidation of Fe-Mn alloys and Mn in H2-H2SDedicated to Professor Dr. Alfred Rahmel on the occasion of his 60th birthday (1987)
    Weinheim [u.a.] : Wiley-Blackwell
    Materials and Corrosion/Werkstoffe und Korrosion 38 (1987), S. 498-506 
    Details
    ISSN: 0947-5117
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: Sulfidierung von Fe-Mn-Legierungen und Mn bei hohen TemperaturenDie Sulfidierung von Fe-Mn-Legierungen mit 20-50% Mn und von reinem Mn wurde bei 973 K, 1073 K und 1173 K in H2-H2S Atmosphären bei konstantem pS2 oder konstantem pH2S/pH2 untersucht, unter Bedingungen, bei denen nur MnS gebildet wird. Die Sulfidierungskinetik ist vorwiegend parabolisch, aber bedingt durch zwei verschiedene Diffusionsvorgänge. Bei der Sulfidierung der Fe-Mn-Legierungen bei 973 K und 1073 K ist die Diffusion der Mn-Atome in der Legierung der geschwindigkeitsbestimmende Vorgang, und es wird eine verzahnte Grenzfläche Sulfidschicht/Legierung beobachtet. Bei 1173 K erfolgt ein Übergang zur Kontrolle der Sulfidierungsgeschwindigkeit durch Diffusion des Mn in der Sulfidschicht und ein Übergang von der verzahnten Grenzfläche zur ebenen Grenzfläche.
    Notes: The sulfidation behaviour of a range of Fe-Mn alloys and pure Mn were studied at 973 K, 1073 K, and 1173 K in H2-H2S atmospheres at constant pS2 or constant pH2S/pH2. The sulfidation kinetics were parabolic in most cases, but two different diffusion processes affect the kinetics. In the sulfidation of the Fe-Mn alloys at 973 K and 1073 K, the diffusion of manganese atoms in the alloy is the rate-determining step and an interlocked scale/alloy interface is observed. At 1173 K there is a transition to rate-control by the diffusion of manganese in the sulfide scale connected with transition from rugged to a planar scale/alloy interface.
    Additional Material: 13 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/maco.19870380907
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  • 4
    Electronic Resource
    Electronic Resource
    Einflüsse von HCl und N2 auf die Hochtemperaturkorrosion in Atmosphären mit niedrigem Sauerstoffdruck (1989)
    Weinheim [u.a.] : Wiley-Blackwell
    Materials and Corrosion/Werkstoffe und Korrosion 40 (1989), S. 642-650 
    Details
    ISSN: 0947-5117
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: Influence of HCl and N2 on high temperature corrosion in atmospheres with low oxygen pressuresThe effects of HCl and N2 on the high temperature corrosion in atmospheres with low oxygen pressures were investigated.Investigations of the alloy Fe-20Cr in He-H2-H2-O-HCl atmospheres at 1173 K under conditions, where no condensed chlorides could be formed, show the simultaneous growth of Cr2O3 and evaporation of CrCl2. The kinetics of the reactions can be described by growth of Cr2O3 according to the parabolic rate law and transport of CrCl2 in the gas flow following a linear rate law.During heating of the samples in He-H2-H2O-HCl condensed chlorides are formed which decrease the adherence of the oxide layers and cause oxide spallation during cooling. This can be avoided either by preoxidation in H2-H2O or heating in dry hydrogen. The porosity of Cr2O3 layers is not enhanced when HCl is added to the gas atmosphere.The oxidation and evaporation is enhanced in N2-H2-H2O-HCl atmospheres compared to He-H2-H2O-HCl atmospheres. The Cr2O3 scales are coarse grained and poros. The enhanced porosity is caused by the nucleation and growth of chromium nitrides in the transient state of oxidation.
    Notes: Der Einfluß von gasförmigem HCl und Stickstoff auf die Hochtemperatur-Korrosion in Atmosphären mit niedrigem Sauerstoffpartialdruck wurde untersucht.Untersuchungen mit der Legierung Fe-20Cr in He-H2-H2O-HCl-Atmosphären bei 1173 K unter Bedingungen, bei denen keine kondensierten Chloride gebildet werden, zeigten, daß gleichzeitig Wachstum von Cr2O3 und Abdampfen von CrCl2 erfolgt. Die Kinetik der Gesamtreaktion läßt sich durch Überlagerung eines parabolischen Zeitgesetzes für das Oxidwachstum mit einem linearen Zeitgesetz für die Abdiffusion des Chlorides in den Gasstrom beschreiben.Beim Aufheizen der Proben in He-H2-H2O-HCl bilden sich kondensierte Chloride, die die Haftung der Oxidschichten beeinträchtigen und Abplatzen beim Abkühlen verursachen. Voroxidation in H2-H2O oder Aufheizen in getrocknetem Wasserstoff verhindern dies. Die Porosität von Cr2O3-Schichten wird durch den Zusatz von HCl zur Gasatmosphäre nicht erhöht.In N2-H2-H2O-HCl-Atmosphären ist die Oxidation und das Abdampfen beschleunigt gegenüber He-H2-H2O-HCl-Atmosphären. Die gebildeten Cr2O3-Schichten sind grobkörnig und porös. Ursache der erhöhten Porosität ist die Keimbildung und das Wachstum von Chromnitriden im Anfangsstadium der Oxidation.
    Additional Material: 16 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/maco.19890401104
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  • 5
    Electronic Resource
    Electronic Resource
    Zur Polymerisation von Allylverbindungen. Reaktion von Allylbenzen mit 2,2′-Azo-bis-isobutyronitril (1983)
    Weinheim : Wiley-Blackwell
    Acta Polymerica 34 (1983), S. 328-331 
    Details
    ISSN: 0323-7648
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: 2,2′-azo-bis-isobutyronitrile was completely thermally decomposed in allyl benzene. The reaction mixture obtained was separated by preparative gas and thin-layer chromatography. Using steam pressure measurements and the logarithmic dependence of gas chromatographic retention value of the molecular weight the molecular weight of the separated components was investigated. The structure was analysed by IR- and NMR-spectroscopy and 14C-labelled tracer substances. A mechanism of the reactions is discussed.
    Notes: 2,2′-Azo-bis-isobutyronitril wurde in Allylbenzen thermisch vollständig zersetzt. Das entstehende Reaktionsgemisch konnte mit Hilfe der präparativen Gas- und Dünnschichtchromatographie getrennt werden. Die Bestimmung der Molmassen der abgetrennten Komponenten erfolgte über Dampfdruckmessungen sowie über die logarithmische Abhängigkeit der gaschromatographischen Retentionswerte von den Molmassen. Die Konstitutions- und Konfigurationsaufklärung gelang mittels IR- und NMR-Spektroskopie sowie durch Anwendung von 14C-markierten Tracer-Substanzen. Ein möglicher Reaktionsablauf wird diskutiert.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/actp.1983.010340604
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  • 6
    Electronic Resource
    Electronic Resource
    Untersuchungen zur radikalischen Copolymerisation von Acrylnitril mit α-Olefinen. 9. Mitt.: Lösungsmittelabhängigkeit der Copolymerisationsparameter8. Mitt.: siehe [2] (1986)
    Weinheim : Wiley-Blackwell
    Acta Polymerica 37 (1986), S. 16-18 
    Details
    ISSN: 0323-7648
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: The constants derived for the copolymerization systems of allylbenzene, 2-methylpentene-1 and isobutene with acryloninitrile, the rAN values being independent of the comonomer mixture and the yield, as well as the parameters rANL required for estimating the effect of the solvent by combining the overall rate and copolymerization equations were found to correlate linearly with the donor value of the solvent. The effect of the solvent is explained predominantly by the interaction of electrophilic macroradicals being solvated to different degree with acrylonitrile at the chain end.
    Notes: Die für die Copolymerisationssysteme von Allylbenzen, 2-Methylpenten-1 und Isobuten mit Acrylnitril abgeleiteten Konstanten, die von der Comonomermischung und dem Umsatz unabhängigen rAN-Werte sowie die zur Quantifizierung des Lösungsmitteleinflusses aus der Kombination von Bruttogeschwindigeits- und Copolymerisationsgleichung erhaltenen Parameter rANL korrelieren linear mit der Donorzahl der Lösungsmittel. Der Lösungsmitteleinfluß wird vor allem durch die Wechselwirkung des unterschiedlich solvatisierten elektrophilen Makroradikals mit Acrylnitril am Kettenende erklärt.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/actp.1986.010370104
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  • 7
    Electronic Resource
    Electronic Resource
    Polarographische Bestimmung der Zerfallsgeschwindigkeit von 2,2′-Azo-di(isobutyronitril) in Acrylnitril-Polymerisationslösungen (1981)
    Weinheim : Wiley-Blackwell
    Acta Polymerica 32 (1981), S. 228-228 
    Details
    ISSN: 0323-7648
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Additional Material: 3 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/actp.1981.010320411
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  • 8
    Electronic Resource
    Electronic Resource
    Untersuchungen zur radikalischen Copolymerisation von Acrylnitril mit α-Olefinen in polaren Lösungsmitteln 10. Mitt.: Abhängigkeit der Bruttogeschwindigkeit von den Reaktionsbedingungen9. Mitt.: siehe [4] (1986)
    Weinheim : Wiley-Blackwell
    Acta Polymerica 37 (1986), S. 172-174 
    Details
    ISSN: 0323-7648
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: The overall rate of copolymerization of the systems acrylonitrile/allylbenzene, acrylonitrile/α-methylstyrene, acrylonitrile/2-methylpentene-1 and, for comparison, acrylonitrile/styrene was determined in dependence on the solvent of the monomer mixture, the overall monomer concentration and the temperature. The results are discussed by means of an empirical overall rate equation.
    Notes: Die Bruttogeschwindigkeit der Copolymerisation der Systeme Acrylnitril/Allylbenzen, Acrylnitril/α-Methylstyren, Acrylnitril/2-Methylpenten-1 und im Vergleich dazu von Acrylnitril/Styren werden in Abhängigkeit vom Lösungsmittel der Monomermischung, der Gesamtmonomerkonzentration und der Temperatur bestimmt. Die Ergebnisse werden mit einer empirischen Bruttogeschwindigkeitsgleichung diskutiert.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/actp.1986.010370311
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  • 9
    Electronic Resource
    Electronic Resource
    Untersuchungen zur radikalischen Copolymerisation von Acrylnitril mit α-Olefinen. 8. Mitt.: Bestimmung der r-Werte nach dem Modell der am Reaktionsort reduzierten Olefinkonzentration7. Mitt.: siehe [1] (1985)
    Weinheim : Wiley-Blackwell
    Acta Polymerica 36 (1985), S. 671-675 
    Details
    ISSN: 0323-7648
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: In the binary copolymerization systems of allylbenzene, 2-methylpentene-1 and isobutene with acrylonitrile rOlefin = 0 can be postulated. By linear correlation of the rAN-values with the molar fraction of the olefin the ordinate intersection provides constant values of rAN depending only on the kind of olefin and the solvent. Constant values of rAN are also obtained by supposing the olefin concentration to be reduced at the reaction site. The concentration of reactive olefins is related to their initial amount by an exponential expression.
    Notes: Für die binären Copolymerisationssysteme von Allylbenzen, 2-Methylpenten-1 und Isobuten mit Acrylnitril läßt sich rOlefin = 0 postulieren. Durch lineare Korrelation der rAN-Werte und dem Molenbruch des Olefins werden aus dem Ordinatenabschnitt konstante rAN-Werte erhalten, die nur von der Art des Olefins und dem Lösungsmittel abhängig sind. Die konstanten rAN-Werte lassen sich auch auf Basis der Modellvorstellung, daß die Olefinkonzentration am Reaktionsort reduziert ist, ableiten. Die reaktive Olefinkonzentration ist durch eine Exponentialbeziehung mit der eingesetzten verknüpft.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/actp.1985.010361208
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  • 10
    Electronic Resource
    Electronic Resource
    Miscibility studies of polymeric and low molecular weight liquid crystals and their behaviour in an electric field (1982)
    Basel : Wiley-Blackwell
    Die Makromolekulare Chemie, Rapid Communications 3 (1982), S. 745-751 
    Details
    ISSN: 0173-2803
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/marc.1982.030031017
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