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  • Articles: DFG German National Licenses  (19)
  • Chemistry  (16)
  • Electron microscopy  (3)
  • 1
    Electronic Resource
    Electronic Resource
    Histopathology of otitis media with effusion (1986)
    Springer
    European archives of oto-rhino-laryngology and head & neck 243 (1986), S. 269-273 
    Details
    ISSN: 1434-4726
    Keywords: Otitis media with effusion ; Electron microscopy ; Human temporal bones
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Ultrastructural studies of the middle ear mucosa appear to be of significant value in better understanding the pathology of otitis media with effusion (OME). Our present study was undertaken in order to take advantage of the use of electron microscopy in investigating all areas of the middle ear mucosa. Tissues studied were obtained from the fresh postmortem temporal bones of three patients with OME and terminal head and neck malignancies. In the mucoid type of effusion (cases 1 and 2), goblet cells were seen to proliferate and secretory activity was greatly enhanced. In contrast, there was no evidence of secretory cell proliferation in the serous type of effusion. It was noteworthy that accumulated fluid was not homogeneous in the same ear, as exemplified by case 1, in which both mucoid and serous effusions were present. This occurrence was possibly the result of topographic diversity involving the secretory activity of the middle ear.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00464444
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Mitosis in the dermatophyteMicrosporum canis as revealed by freeze substitution electron microscopy (1985)
    Springer
    Protoplasma 129 (1985), S. 198-213 
    Details
    ISSN: 1615-6102
    Keywords: Electron microscopy ; Freeze-substitution ; Fungi ; Microsporum canis ; Microtubules ; Mitosis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Mitosis in the dermatophyteMicrosporum canis was studied by freeze substitution and electron microscopy, and analyzed by three dimensional reconstruction from serial sections of the mitotic nuclei. The interphase nucleus has associated nucleus-associated organelle (NAO) on a portion of the outer surface of the nuclear envelope, subjacent to which there was dense intranuclear material. The NAO divided and separated on the envelope, and a spindle was formed. The spindle was composed mostly of microtubules extended between opposite NAOs. Pairing of kinetochores was observed in the spindle from an early stage of development, when chromosomes were not so condensed, and remained unchanged while chromosome condensation proceeded until metaphase. Before the completion of nuclear division, daughter nuclei were connected by a narrow spindle channel, and then the nucleolus, whose structure underwent minimal change during mitosis, was eliminated into the cytoplasm.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01279917
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Electron microscope study of bone lesion in cholesteatoma otitis (1980)
    Springer
    European archives of oto-rhino-laryngology and head & neck 226 (1980), S. 85-92 
    Details
    ISSN: 1434-4726
    Keywords: Cholesteatom ; Knochenzerstörung ; Elektronenmikroskopie ; Cholesteatoma ; Bone destruction ; Electron microscopy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Summary Biopsy specimens were obtained at ear surgery of patients with cholesteatoma otitis and were studied by electron microscopy. The osseous tissue decalcified in EDTA demonstrated degradation of collagen matrix as well as extensive degeneration of bone cells. The surface of the eroded bone was found to be in direct contact with the subepithelial connective tissue or the granulation, but not with the keratinizing squamous epithelium of matrix. These results indicate that the bone destruction by cholesteatoma is of non-osteoclastic type and lend support to the view that the keratinizing squamous epithelium do not participate in bone destruction. On the ultrastructural basis, the inflammatory process in the soft tissue adjacent to bone and extensive degeneration of bone cells are considered as cardinal factors for bone destruction in this disease.
    Notes: Zusammenfassung Die elektronenmikroskopische Untersuchung von Knochenbiopsien bei Cholesteatomoperationen zeigt Veränderungen der kollagenen Knochenmatrix sowie eine ausgedehnte Degeneration von Knochenzellen. Dabei findet sich die Oberfläche des veränderten Knochens in direktem Kontakt mit dem subepithelialen Bindegewebe oder mit Granulationen, nicht aber mit dem Plattenepithel selbst. Die Untersuchungen zeigen, daß entzündliche Prozesse in den dem Knochen benachbarten Bindegewebslagen vorwiegend für die Knochenzerstörung bei Cholesteatom verantwortlich sind.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00455406
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Dielectric relaxation in stretched poly(ethylene suberate) (1979)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 180 (1979), S. 527-532 
    Details
    ISSN: 0025-116X
    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/macp.1979.021800228
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  • 5
    Electronic Resource
    Electronic Resource
    Chromomycin A3, ein cancerostatisch wirkendes Antibiotikum (1964)
    Weinheim : Wiley-Blackwell
    Zeitschrift für die chemische Industrie 76 (1964), S. 792-793 
    Details
    ISSN: 0044-8249
    Keywords: Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/ange.19640761832
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  • 6
    Electronic Resource
    Electronic Resource
    Cyclooligomerisation von Butadien und Übergangsmetall-π-Komplexe (1963)
    Weinheim : Wiley-Blackwell
    Zeitschrift für die chemische Industrie 75 (1963), S. 10-20 
    Details
    ISSN: 0044-8249
    Keywords: Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Es wird über Fortschritte auf dem Gebiet der Synthese und der Reaktionen einiger mittlerer Kohlenstoffringe berichtet sowie im Zusammenhang damit über neuartige π-Komplexe von Übergangsmetallen. Mit Hilfe katalytischer Verfahren können Cyclododeca-1.5.9-trien, Cycloocta-1.5-dien und Cyclododeca-1.5-dien aus Butadien bzw. aus Butadien und Äthylen außerordentlich leicht dargestellt werden.
    Additional Material: 3 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/ange.19630750104
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  • 7
    Electronic Resource
    Electronic Resource
    The application of ultrasonic waves to the electrochemical polymerization of thiophene (1992)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part B: Polymer Physics 30 (1992), S. 19-24 
    Details
    ISSN: 0887-6266
    Keywords: ultrasonic waves ; electrochemical polymerization ; polythiophene ; potential ; current density ; Tafel plot ; conductivity ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The electrochemical polymerization of thiophene was carried out both in the presence and absence of ultrasonic waves. Without irradiation, the anode potential increased with increasing current density. Polymerization at high potential gave a low polymer yield and produced macroscopically heterogeneous films. Ultrasonic irradiation resulted in an improvement of polymer yield and in a lowering of the anode potential during polymerization. The effects were especially marked when the polymerizations were carried out at low temperature, low monomer concentration, and high current density. These results are explained by the formation of diffusion layer in the vicinity of the electrode during electrochemical reactions.
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/polb.1992.090300103
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    Paper (German National Licenses)
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  • 8
    Electronic Resource
    Electronic Resource
    Fusion of particulate structure in polyvinyl chloride during powder extrusion (1972)
    Stamford, Conn. [u.a.] : Wiley-Blackwell
    Polymer Engineering and Science 12 (1972), S. 199-203 
    Details
    ISSN: 0032-3888
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: It has been recognized recently that suspension polyvinyl chloride granules consist of particles ca 1μ in diam which are linked together to form a three-dimensional, sponge-like lattice. This paper deals with the fusion process of this particulate structure of PVC resin during powder extrusion. Extrudates prepared under various extrusion conditions are investigated through the electron microscope using a methyl methacrylate (MMA) embedding method followed by ultrathin sectioning. The MMA embedding method has been proven to be an effective means of revealing the detailed structure of molded PVC. Results showed that the 1μ-particles were subjected to breakdown due to heat and shear into fibrils 100-300 Å in thickness, which were the final structure attainable by extrusion. Discussion was focused on the fibrillar structure especially in relation to the elasticity in plasticized PVC.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pen.760120307
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    Paper (German National Licenses)
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  • 9
    Electronic Resource
    Electronic Resource
    Host-guest chemistry. The structure and proton disorder of the three-component crystal formed by 3(5)-methyl-4-nitropyrazole, (R, R)-(-)-trans-4,5-bis (hydroxydiphenylmethyl)-2,2-dimethyl-1,3-dioxolane and toluene (1996)
    Chichester : Wiley-Blackwell
    Journal of Physical Organic Chemistry 9 (1996), S. 611-618 
    Details
    ISSN: 0894-3230
    Keywords: Chemistry ; Theoretical, Physical and Computational Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The crystal structure at 200 K of the complex formed by the optically active host (R,R)-(-)-trans-4,5-bis(hydroxydiphenylmethyl)-2,2-dimethyl-1,3-dioxolane (2) and 4-nitro-5-methylpyrazole (1b) and toluene as guests was determined by x-ray analysis. Although only the NH protons corresponding to tautomer 1b were found in the structure, some anomalies in the bond angles involving the nitrogen atoms of the pyrazole ring suggested the presence of about 25% of a structure containing the 3-methyl-4-nitropyrazole tautomer (1a). This hypothesis was confirmed by 13C cross polarization magic angle spinning NMR spectroscopy.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
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    Paper (German National Licenses)
  • 10
    Electronic Resource
    Electronic Resource
    Mass spectrometric studies of twenty-one metabolically important acylglycines (1977)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 4 (1977), S. 220-225 
    Details
    ISSN: 1052-9306
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The mass spectra of the methyl esters of twenty-one metabolically important N-acylglycines are reported. The spectra are discussed in terms of their fragmentations and their application to studies of metabolic diseases. In particular, the high relative abundance of the peak at m/e 30 in the spectra of many aliphatic acylglycine methyl esters was studied by using ([2,2-2H2]propionyl)glycine and high resolution mass spectrometry. This fragment was assigned to the even-electron ion [CH2 = NH2]+.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bms.1200040406
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