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  • 1975-1979  (7)
  • 1965-1969  (4)
  • Polymer and Materials Science  (9)
  • evozierte Gleichspannungspotentiale  (2)
  • General Chemistry
  • 1
    Electronic Resource
    Electronic Resource
    Reizkorrelierte Gleichspannungsänderungen der primären Hörrinde an der wachen Katze (1969)
    Springer
    Pflügers Archiv 306 (1969), S. 281-289 
    Details
    ISSN: 1432-2013
    Keywords: Hearing ; Auditory Cortex ; Evoked d-c Potentials ; Intensity Function ; Gehör ; Hörrinde ; evozierte Gleichspannungspotentiale ; Intensitätsfunktion
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung Schallreizkorrelierte Gleichspannungsänderungen der primären Hörrinde (CGA=corticale Gleichspannungsantwort) wurden über subdurale implantierte Ag−AgCl Elektroden von der Katze abgeleitet und mit einem LINC-8-Rechner ausgewertet. Die CGA sind während der ganzen Reizdauer vorhanden, sie sind abhängig von der Reizqualität (z. B. Tonfrequenz), der Narkosetiefe und der Reizintensität. Die Intensitätsfunktion (Zusammenhang zwischen CGA-Amplitude und Reizintensität) wurde genauer untersucht und durch die Steigungskoeffizienten der Ausgleichsgeraden in Abhängigkeit von der Analysezeit (Zeitdifferenz zwischen Reizbeginn und Analysezeitpunkt) unter Berücksichtigung der Korrelation charakterisiert. Der Steigungskoeffizienn variiert mit der Analysezeit. Während er sich in der ersten Sekunde zwischen den Werten 0,7 und 0,4 bewegt, tendiert er mit wachsender Analysezeit gegen 0,3.
    Notes: Summary Sound evoked d-c changes in the primary auditory cortex (CGA= corticale Gleichspannungsantwort) of the cat were recorded with subdural implanted Ag-AgCl electrodes and analysed with a LINC-8-Computer. The CGA were maintained for the whole duration of stimulus, they depend on the stimulus quality (e.g. tone frequency), on the level of anesthesia and on the stimulus intensity. The intensity function (relation between CGA amplitude and stimulus intensity) has been investigated. It is characterised by the rising coefficient of the approximating line in dependence of the time of analysis (time of analysis starts with the stimulus beginning) with respect to correlation. The rising coefficientn varies with the time of analysis. Whereas in the first second it varies between the values 0.7 and 0.4 it tends with increasing time of analysis to 0.3.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00589154
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  • 2
    Electronic Resource
    Electronic Resource
    Akustischen Reizen zugeordnete Gleichspannungsänderungen am intakten Schädel des Menschen (1969)
    Springer
    Pflügers Archiv 309 (1969), S. 362-367 
    Details
    ISSN: 1432-2013
    Keywords: Hearing ; Evoked d-c Potentials ; Intensity Function ; Schlüsselwörter ; Gehör ; evozierte Gleichspannungspotentiale ; Intensitäts-funktion
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung Schallreizkorrelierte Gleichspannungsänderungen wurden mit AgCl-Elektroden vom intakten Schädel erwachsener Menschen (RGA = reizkorrelierte Gleichspannungsantwort) abgeleitet und mit einem LINC-8-Rechner ausgewertet. Die RGA sind während der ganzen Reizdauer vorhanden. Sie sind am Vertex am größten und sind von der Reizintensität abhängig. Die Intensitätsfunktion (Zusammenhang zwischen RGA-Amplitude und Reizintensität) wurde genauer untersucht und durch die Steigungskoeffizienten der Ausgleichsgeraden in Abhängigkeit von der Analysezeit (Zeitdifferenz zwischen Reizbeginn und Analysezeitpunkt) unter Berücksichtigung der Korrelation zwischen Ausgleichsgeraden und Meßwerten charakterisiert.
    Notes: Summary Sound evoked d-c changes (RGA = Reizkorrelierte Gleichspannungs-Antwort) were recorded with AgCl-electrodes from the intact heads of grown up human subjects and analysed with a LINC-8 Computer. The RGA were maintained during the whole duration of stimulus. They are largest at the Vertex and depend on stimulus intensity. The intensity function (relation between RGA amplitude and stimulus intensity) has been investigated and is characterised by the rising coefficient of the approximation line in dependence of the time of analysis (time of analysis starts with the beginning of the stimulus) with respect to the correlation between the approximating line and the measured data.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00587759
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  • 3
    Electronic Resource
    Electronic Resource
    Characterization of the urinary polymer-related material from rats given poly[biguanide-1,5-diylhexamethylene hydrochloride] (1976)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 177 (1976), S. 2591-2605 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Die gastrointestinale Absorption von Poly(biguanid-1,5-diylhexamethylen-hydrochlorid) (1) in Ratten beträgt nur 5,6% einer einzigen oralen Dosis, und auch nach Langzeitbehandlung liegen die Konzentrationen im Gewebe höchstens bei 0,3 μg g-1. Durch cinfache chromatographische und spektroskopische Methoden konnte gezeigt werden, daß die im Harn ausgeschiedenen Substanzen in kleinen Mengen aus 1-Oligomeren mit zwer Cyanguanidino-Endgruppen bestehen, sowie aus Spuren von 3,3′-Dicyano-1,1′-hexamethylendiguanidin (8a) und einer Verbindung, die für 1-(6-Aminohexyl)-3-cyanoguanidin (2) gehalten wird, und die bei der Synthese von 1 entsteht. Die Bestandteile von 1 werden demnach in Ratten nicht metabolisiert.
    Notes: Gastro-intestinal absorption in rats of poly[biguanide-1,5-diylhexamethylene hydrochloride] (1) amounts to only 5,6% of a single oral dose, and after chronic administration, tissue concentrations do not exceed 0,3 μg g-1. It has been shown by simple chromatographic and spectroscopic methods that urinary polymer-related material consists of small amounts of 1-oligomers, with two cyanoguanidino end groups, as well as the trace constituents, 3,3′-dicyano-1,1′-hexamethylenediguanidine (8a) and a compound which is considered to be 1-(6-aminohexyl)-3-cyanoguanidine (2) that is formed during the synthesis of 1. Hence, the constituents of 1 are unmetabolized in rats.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1976.021770902
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  • 4
    Electronic Resource
    Electronic Resource
    Shear properties of polystyrenes in the transition region (1969)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 13 (1969), S. 1993-2006 
    Details
    ISSN: 0021-8995
    Keywords: Chemistry ; Polymer and Materials Science
    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: Shear properties of commercially available polystyrenes with narrow molecular weight distribution have been measured in the transition region from 100°C to 150°C and over a frequency range from 50 Hz to 1000 Hz. The effect of molecular weight or shear properties is established with four polymers ranging in molecular weight from 20,000 to 860,000. A broad, bimodal distribution is also studied. The properties of these polymers, with two different diluents added, illustrate the rather marked qualitative difference in effects caused by diluents.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1969.070130917
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  • 5
    Electronic Resource
    Electronic Resource
    Shear degradation of cellulose derivatives (1978)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 22 (1978), S. 865-867 
    Details
    ISSN: 0021-8995
    Keywords: Chemistry ; Polymer and Materials Science
    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
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1978.070220326
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  • 6
    Electronic Resource
    Electronic Resource
    Calibration of vapor pressure osmometers for molecular weight measurement (1979)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 24 (1979), S. 293-299 
    Details
    ISSN: 0021-8995
    Keywords: Chemistry ; Polymer and Materials Science
    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: Experimental molecular weights in the range 200 to 100,000 Daltons have been determined by vapor pressure osmometry using three different solvents. For all values in excess of 10,000, molecular weights were also determined by membrane osmometry. The general agreement found for molecular weights determined under a variety of conditions, leads to the conclusion that values as high as 100,000 Daltons can be determined by at least one type of vapor pressure osmometer when it is calibrated with a material of 200 Daltons. Thermistor self-heating and diffusion in the liquid phase are shown to be unimportant for this particular instrument.
    Additional Material: 2 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1979.070240126
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  • 7
    Electronic Resource
    Electronic Resource
    Reconstruction of the canine Achilles and patellar tendons using Dacron mesh silicone prosthesis. I. Clinical and biocompatibility evaluation (1976)
    Hoboken, NJ : Wiley-Blackwell
    Journal of Biomedical Materials Research 10 (1976), S. 47-59 
    Details
    ISSN: 0021-9304
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Medicine , Technology
    Notes: Surgical replacement of the Achilles and patellar tendons using Dacron mesh silicone prostheses was performed in 15 mature beagle dogs. This part of the study includes clinical evaluation, gross inspection at autopsy of regrown tendons, and histological determination of biocompatibility of prosthetic implants.Functional continuity and integrity of prosthetic patellar tendons have been established by evaluating the biologic-prosthetic interface and the mechanical properties of regrown tendon tissue around and through the Dacron silicone replacements. Results of prosthetic Achilles tendons were less satisfactory because of difficulties in suturing to a muscle and its fascia. Although the prosthetic tendon did not regrow through the tube, it provided a structure for regrowth around it. The regrown tendons became nearly ten times the normal crosssectional area after three to four months and decreased to two to three times after 13 months.Histological studies indicate that in the absence of infection, the Dacron mesh silicone tendon was well tolerated for periods up to 13 months. Overall results are encouraging and warrant further investigation although the regenerative capacity of human patellar and Achilles tendons is unknown.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jbm.820100106
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  • 8
    Electronic Resource
    Electronic Resource
    Exploratory analysis of the influence of substitutional impurities on the electronic properties of poly(sulfur nitride) (1978)
    New York : Wiley-Blackwell
    Journal of Polymer Science: Polymer Physics Edition 16 (1978), S. 1023-1029 
    Details
    ISSN: 0098-1273
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The results of extended Huckel calculations are reported for an isolated (SN)x chain in which some of the S2N2 units of the extended one-dimensional chain are replaced by (SCH2)2 units. It is found that, inter alia, the metallic behavior of the unsubstituted parent is retained but that the conductivity is lowered to an extent governed by the nature and degree of substitution.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1978.180160609
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  • 9
    Electronic Resource
    Electronic Resource
    Suspension polymerization of vinyl chloride initiated by in situ generated diisobutyryl peroxide (1978)
    New York : Wiley-Blackwell
    Journal of Polymer Science: Polymer Chemistry Edition 16 (1978), S. 2091-2091 
    Details
    ISSN: 0360-6376
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1978.170160826
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  • 10
    Electronic Resource
    Electronic Resource
    Suspension polymerization of vinyl chloride initiated by in situ generated diisobutyryl peroxide (1977)
    New York : Wiley-Blackwell
    Journal of Polymer Science: Polymer Chemistry Edition 15 (1977), S. 2545-2557 
    Details
    ISSN: 0360-6376
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: It was found that diacyl peroxides can be formed in situ in a polymerization medium by the reaction of an acid anhydride with hydrogen peroxide. For the specific application to aqueous vinyl chloride polymerization, an initiator system based on the base-catalyzed reaction of isobutyric anhydride with hydrogen peroxide to produce diisobutyryl peroxide gave very good results. In contrast, the acid chloride was completely ineffective as a peroxide precursor in this reaction. Studies pointing to diisobutyryl peroxide as the initiating species; investigations of reactant stoichiometry; and comparison of the in situ system with preformed diisobutyryl peroxide were conducted. It was shown that this system makes possible the polymerization of vinyl chloride at 30°C at rates comparable to those obtained with dialkyl peroxydicarbonates at 50°C, thus demonstrating the ability of this system to initiate vinyl chloride polymerization at low temperature. The rates of vinyl chloride polymerization with the use of different concentrations of in situ diisobutyryl peroxide at 30, 40, and 50°C were determined. Similarly, polymerization rates with the use of combinations of in situ diisobutyryl peroxide and n-propyl peroxydicarbonate were determined. The data obtained demonstrate rapid initiation of the polymerization reaction and a reduction in polymerization time made possible by this dual initiator system. These results were verified in pilot-plant and commercial-scale PVC polymerizations.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1977.170151101
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