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  • Polymer and Materials Science  (6)
  • 2020-2022
  • 1965-1969  (4)
  • 1950-1954  (2)
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  • 1
    Electronic Resource
    Electronic Resource
    Effect of oxygen binding on the dielectric properties of hemoglobin (1968)
    New York : Wiley-Blackwell
    Biopolymers 6 (1968), S. 1717-1725 
    Details
    ISSN: 0006-3525
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The dielectric properties of horse hemoglobin have been investigated in the frequency range for 100 kcps to 15 Mcps at varying degrees of oxygenation. A linear dependence of the specific increment on the degree of oxygenation was found under a variety of experimental conditions, the increment of oxygenated hemoglobin being about 10% larger than that of deoxygenated hemoglobin. A similar difference was obtained with human adult and fetal hemoglobin. No variation of the dielectric parameters as reported by Takashima and Lumry could be detected.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bip.1968.360061206
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  • 2
    Electronic Resource
    Electronic Resource
    Dielectric properties of oxyhemoglobin and deoxyhemoglobin in aqueous solution at microwave frequencies (1968)
    New York : Wiley-Blackwell
    Biopolymers 6 (1968), S. 1705-1715 
    Details
    ISSN: 0006-3525
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The complex dielectric constant of aqueous hemoglobin solution was measured at 9.5 GHz. A microwave technique allowing phase and attenuation settings with an accuracy of 0.3° and 0.03 db was used. The shift of the relaxation wavelength and the hydration values of horse hemoglobin were determined for native and lyophilized hemoglobin solution and erythrocytes suspensions as well. The isotope effect of light and heavy water on these parameters was detected. The influence of buffers was studied. Relative measurements, with the sensitivity increased by a factor of 20, were made with alternating oxygenated and deoxygenated human hemoglobin solutions. The oxygenation of hemoglobin was found to leave the hydrated molecule volume invariant within ±250 Å3, while a shift of the relaxation wavelength of 0.0025 ± 0.0015 cm occurs for a hemoglobin concentration of 107 g/l. The results are discussed in terms of the structure and function interrelationship of hemoglobin and the current picture of water structure.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bip.1968.360061205
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  • 3
    Electronic Resource
    Electronic Resource
    Dielectric properties of hemoglobin and myoglobin. I. Influence of solvent and particle size on the dielectric dispersion (1969)
    New York : Wiley-Blackwell
    Biopolymers 7 (1969), S. 963-974 
    Details
    ISSN: 0006-3525
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Dielectric dispersion measurements with aqueous solutions of hemoglobin and myoglobin have been performed in the frequency range from 100 kcps to 15 Mcps. The influence of preparation, particle size, and solvent conditions was studied. The results are analyzed in terms of an orientational polarization mechanism.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bip.1969.360070611
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  • 4
    Electronic Resource
    Electronic Resource
    Fortschritte auf dem Gebiet des säurefesten Steinzeugs (1954)
    Weinheim [u.a.] : Wiley-Blackwell
    Materials and Corrosion/Werkstoffe und Korrosion 5 (1954), S. 41-43 
    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: Progress in the Manufacture of Acidresistant StonewareOne of the distinguishing features of stoneware is its resistance to chemical action and its outstanding mechanical properties. These qualities permitted the development of stoneware to keep pace with that of the chemical industry.The article describes further progress in the field of acid-resistant stoneware. Particular emphasis is laid on the development of special mixtures having great powers of resistance to temperature changes, at the same time retaining their excellent heat-conducting properties. Improvements in the mechanical working of stoneware are also discussed.The mechanical working of stoneware by grinding, polishing and threading has been brought to the point where the accuracy and finish of the work is equivalent to that obtaining in metal working practice. A new field of application of stoneware was thereby opened. The production of air and dust locks for use in installation working with ultrafine abrasive dust particles is an example. Stoneware rollers having precision ground surfaces are used in various industries. Ground, polished and threaded stoneware components enable many improvements and simplifications to be made in the design of machinery and equipment for the chemical industry.
    Notes: Kennzeichnend für den Werkstoff Steinzeug sind seine Beständigkeit gegenüber chemischer Korrosion und seine ausgezeichneten mechanischen Eigenschaften. Beides waren die Voraussetzungen, um mit der Entwicklung der chemischen Großindustrie Schritt halten zu können.In der Abhandlung werden weitere Fortschritte auf dem Gebiet des säurefesten Steinzeug besprochen. Diese werden besonders deutlich durch Entwicklung von temperaturwechselbeständigen und wärmeleitfähigen Spezialmassen und durch Verbesserung der Nachbearbeitungsmethoden.Die mechanische Bearbeitung von Steinzeug durch Schleifen, Polieren und Gewindeschneiden wurde so weit entwickelt, daß eine Vergütung und Maßgenauigkeit möglich ist, wie in der Metallindustrie. Dadurch wurden dem Steinzeug neue Anwendungsmöglichkeiten erschlossen. Beispielsweise werden Staubschleusen zur Förderung von feinsten aggressiven Staubteilchen hergestellt. Steinzeugwalzen mit präzisem Schliff der Oberfläche finden in verschiedenen Industriezweigen Verwendung. Geschliffene, polierte und mit Gewinde versehene Steinzeugteile brachten Vereinfachungen und Verbesserungen im Steinzeugmaschinen- und Apparatebau.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/maco.19540050202
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  • 5
    Electronic Resource
    Electronic Resource
    Fraktionierung hochmolekularer stoffe an silicagelpräparaten mit unterschiedlicher hohlraumstrukturHerrn Professor Dr. W. KERN zum 60. Geburtstag gewidmet (1966)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 93 (1966), S. 1-12 
    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: For column chromatography of dissolved materials silica gel preparations with systematically changed space structure are used. Differences of space structure are characterised by a distinctive parameter of space structure, the specific pore volume.Separations are described which are no longer effected by differentiated chemical reactions of the dissolved materials with the silica gel surface, but only by a differentiated distribution of the larger and smaller particles of the dissolved materials between the mobile phase of the solvent and the quasi-stationary phase of this solvent within the wide pores of the silica gel granules.Separations were made of the following material systems:Thorium oxide sol/Cl ions (using water as solvent), styrene/polystyrene (using benzene or chloroform as solvent), paraffin/polystyrene (using chloroform as solvent). Polystyrene as a mixture of polymeric homologues of the mean molecular weight 38,000 or 250,000 is fractionated. In the successive fractions the mean molecular weight decreases.
    Notes: Für die Sälenchromatographie gelöster Stoffe werden Silicagelpräparate mit systematisch abgeänderter Hohlraumstruktur eingesetzt. Unterschiede der Hohlraumstruktur werden durch einen besonders hervortretenden Parameter der Hohlraumstruktur, das spezifische Porenvolumen, gekennzeichnet.Es werden Trennungen beschrieben, die nicht mehr auf differenzierten chemischen Reaktionen der gelösten Stoffe mit der Oberfläche des Silicagels, sondern nur noch auf einer differenzierten Verteilung der größeren und kleineren Teilchen der gelösten Stoffe zwischen der mobilen Phase des Lösungsmittels und der quasi-stationären Phase desselben Lösungsmittels in den weiten Poren der Silicagelkörner beruhen.Trennungen werden ausgeführt an den Stoffsystemen:Thoriumoxidsol/Cl-lonen (mit Wasser als Transportflüssigkeit), Styrol/Polystyrol (mit Benzol bzw. Chloroform als Transportflüssigkeit), Paraffin/Polystyrol (mit Choroform als Transportflüssigkeit). Polystyrol als Gemisch von Polymerhomologen mit dem mittleren Molekulargewich 38000 bzw. 250000 werden fraktioniert. In den aufeinanderfolgenden Fraktionen nimmt das mittlere Molekulargewicht ab.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1966.020930101
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  • 6
    Electronic Resource
    Electronic Resource
    Zur feinstruktur von ramie (1953)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 11 (1953), S. 111-130 
    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: Purified ramie-fibres were mechanically disintegrated. The double shadowed electron microscopic preparations revealed microfibrils with an average width of 173-203 Å and a thickness of about 30 Å. Their flattened side lays parallel to the supporting membrane. Hydrolysis in H2SO4 caused a breakage of the microfibrils into irregular „hydrolysis particles“, which consist of smaller units with 80-100 Å width and 300-1000 Å length. These probably correspond to the micellae revealed by x-ray analysis.
    Notes: Gereinigte Ramiefasern wurden auf verschiedene Weise mechanisch zertrümmert. In doppelt beschatteten elektronenmikroskopischen Präparaten wurden durchschnittliche Mikrofibrillenbreiten von 173-203 Å gemessen. Die Dicke der Mikrofibrillen, die mit ihrer Breitseite der Unterlage aufliegen, beträgt etwa 30 Å. Bei der Hydrolyse in H2SO4 werden die Fibrillen zu unregelmäßigen „Hydrolyseteilchen“ quergespalten. Diese sind aus kleineren Partikeln von 80-100 Å Breite und 300-1000 Å Länge zusammengesetzt, die wahrscheinlich den röntgenometrischen Micellen entsprechen.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1953.020110113
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