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  • Chemistry  (157)
  • 2010-2014
  • 2005-2009
  • 1970-1974  (67)
  • 1965-1969  (90)
  • 1
    Electronic Resource
    Electronic Resource
    A method for characterizing the rheological properties of viscous fermentation broths (1973)
    New York, NY [u.a.] : Wiley-Blackwell
    Biotechnology and Bioengineering 15 (1973), S. 201-206 
    Details
    ISSN: 0006-3592
    Keywords: Chemistry ; Biochemistry and Biotechnology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bit.260150115
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  • 2
    Electronic Resource
    Electronic Resource
    Interaction of aminoacridines with deoxyribonucleic acid: Effects of ionic strength, denaturation, and structure (1965)
    New York : Wiley-Blackwell
    Biopolymers 3 (1965), S. 135-153 
    Details
    ISSN: 0006-3525
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The binding curves of various aminoacridines on calf thymus DNA have been determined by a spectrophotometric method. The dominant role of electrostatic forces in the interaction has been confirmed by the effect of ionic strength. Side chain and ring substituents in the aminoacridines do not inhibit binding, since this decreases in the order: acranil 〉 neomonacrin 〉 atebrin 〉 9-aminoacridine ∼ proflavine 〉 9-amino-1,2,3,4-tetrahydroacridine (THA). The last named shows the effect of diminishing the flat area of the rings in the aminoacridines. The shape of the binding curves of proflavine, 9-aminoacridine, and THA on thermally denatured DNA show that about 30-50% more binding sites are available to these cations on denatured DNA than on native DNA, but that the binding constants are the same. These observations are discussed in relation to the intercalation and other models for the interaction. It is concluded that exact and complete intercalation is not a necessary condition of strong binding and that other, less regular, models, in which the positive ring nitrogens of the acridines are close to the DNA phosphates and the acridine rings partially interact with the DNA base rings, are probably more consistent with the effect of denaturation of DNA on the binding curves which are characteristic of the interaction in solution.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bip.360030204
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  • 3
    Electronic Resource
    Electronic Resource
    Interaction of aminoacridines with deoxyribonucleic acid: Viscosity of the complexes (1966)
    New York : Wiley-Blackwell
    Biopolymers 4 (1966), S. 971-987 
    Details
    ISSN: 0006-3525
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The intrinsic, viscosities at zero shear rate of defined complexes of proflavine, 9-aminoacridine, and 9-amino-l,2,3,4-tetrahydroaeridine with calf thymus DNA have been determined at, various ionic strengths by means of rotating cylinder viscometers. By controlled adjustment, of the composition of the mixtures, the amount of bound acridine (r moles/g.-atom DNA phosphorus) was maintained constant at different dilutions. The intrinsic viscosities of the complexes increased with r up to r values (ca. 0.16-0.20) corresponding to the end of the process of strong binding of the acridinium cations. However, complex formation between the acridines and thermally denatured DNA caused either a marked decrease in viscosity (at the low ionic strengths of 0.0015 and 0.005) or no change at all (ionic strength 0.1). These results are discussed in the light of presently available hydrodynamic theories relating the intrinsic, viscosity of DNA to its molecular extension.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bip.1966.360040903
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  • 4
    Electronic Resource
    Electronic Resource
    Surface crosslinking of polyethylene and adhesive joint strength (1974)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 18 (1974), S. 235-243 
    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: Exposure of polyethylene film to UV radiation at wavelengths of ≤2537 Å is sufficient to induce surface crosslinking and to facilitate the formation of strong adhesive joints to these surfaces with conventional adhesives. Reduction of the vapor pressure in the reaction vessel to about 1 torr apparently maximizes the efficiency of the crosslinking process. Examination of the treated films which have been exposed for times necessary to form strong adhesive joints has revealed an absence of surface oxidation. It appears that crosslinking to improve the mechanical strength of the surface region of the polyethylene is sufficient to allow the formation of strong adhesive joints.
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1974.070180120
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  • 5
    Electronic Resource
    Electronic Resource
    Verschleiß bei gleichzeitiger elektrochemischer Beanspruchung: KorrosionsverschleißAuszug aus der Dissertation von E. Broszeit, T. H. Darmstadt, D 17, demnächst. (1972)
    Weinheim : Wiley-Blackwell
    Materialwissenschaft und Werkstofftechnik 3 (1972), S. 75-81 
    Details
    ISSN: 0933-5137
    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: Corrosive wear - an example for the behavior of Materials under Combined Mechanical Stress and Chemical Attack. Studies of wear superposed by chemical attack are described. These experiments have been suggested by damages in practice. Thereby too less attention is paid particularly to the possibility of coworking of wear and corrosion. Therefore the origin of these defects often have been misinterpreted.
    Notes: Es wird über erste Versuche aus dem Gebiet des Korrosionsverschleißes berichtet, die durch Schadensfälle in der Praxis angeregt wurden. Das Besondere dabei scheint zu sein, daß man bisher der kombinierten mechanisch-chemischen Beanspruchung auf dem Gebiet des Verschleißes zu wenig Aufmerksamkeit geschenkt hat, so daß durch Korrosionsverschleiß hervorgerufene Schäden häufig nicht als solche erkannt werden, sondern ihre Ursachen nur in einem mechanischen Verschleiß (abrasiv oder adhäsiv) oder unter Umständen noch in einem chemischen Angriff gesehen werden.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mawe.19720030206
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  • 6
    Electronic Resource
    Electronic Resource
    Über den Einfluß der Austenitstabilität von 18/8-Chrom-Nickel-Stählen auf die Verformungseigenschaften und auf das Korrosionsverhalten dieser StähleMitteilung aus der Metallurgischen Zentrale der Stahlwerke Südwestfalen, Hüttental-Geisweid (1970)
    Weinheim [u.a.] : Wiley-Blackwell
    Materials and Corrosion/Werkstoffe und Korrosion 21 (1970), S. 97-109 
    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 austenite stability of 18-8 Cr-Ni-steels on the cold working and corrosion properties of these steelsThe martensite formed during cold working has a negative effect on uniform corrosion only when the specimen is active in the particular medium; if so, corrosion current density increases with the degree of cold working. The martensite generated by cold working reduces on the other hand the susceptibility to intercrystalline corrosion and - in amounts up tn 2% - increases the time to failure in stress corrosion cracking (15 and 45 kp/mm2). The pitting potential is not shifted by the martensite, but pit density increases with the martensite content. In the Kesternich test no negative effect of the martensite is found. It is therefore concluded that reducing the Ni content in 18-8 steels improves workability without having a pronounced deleterions bearing on corrosion behaviour.
    Notes: Der bei Kaltverformung entstehende Martensit ist bei ebenmäßiger Korrosion nur dann schädlich, wenn sich die Probe im jeweiligen Angriffsmittel im Zustand befindet; die Korrosionsstromdichte steigt dann mit dem Verformungsgrad, Der Verformungsmartensit verringert andererseits die Anfälligkeit für die interkristalline. Korrosion und verlängert zn Mengen bis 2% die Standzeit bei Spannungsrißkorrosion (bei 15 und 45 kP/mm2). Das Lochfraßpotential Wird durch den Martensit nicht verändert, doch steigt die Lochzahldichte mit dem Martensitgehalt. Auch im Kesternich-Test wirkt sich der Martensit nicht ungünstig aus. Es wird daher geschlossen, daß eke Verringerung des Nickel-Gehaltes in 18/18- Stählen für die Umformbarkeit günstig ist, ohne das Korrosionsverhalten sehr nachteilig zu beeinflussen.
    Additional Material: 15 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/maco.19700210206
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  • 7
    Electronic Resource
    Electronic Resource
    Beitrag zur Spannungsrißkorrosion austenitischer Cr-Ni-Stähle in MgCl2-Lösungen verschiedener Konzentration bei definierten elektrochemischen AußenbedingungenMitteilung aus dem Institut für Werkstoffkunde der TH Darmstadt (1970)
    Weinheim [u.a.] : Wiley-Blackwell
    Materials and Corrosion/Werkstoffe und Korrosion 21 (1970), S. 473-485 
    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: Contribution to the stress corrosion cracking of austenitic CrNi steels in MgCl2, solution of various concentrations at defined electrochemical conditionsSCC tests in aqueous MgCl2 solutions of various concentrations, temperatures and aeration conditions have been used to determine the influence of sample pre-treatment, oxygen supply at the materials surface, type of loading and the effect of various metallic coatings on the useful life of austenitic CrNi steels. In addition, feasible ways have been studied for achieving a better reproducibility of results, e.g. by lowering MgCl2 concentration or by introducing defined preset potentials or impressed currents. The behaviour of the individual steels in various MgCl2, solutions has been studied on the basis of current density-potential curves.
    Notes: Spannungsrißkorrosionsversuche in waßrigen Magnesiumchloridlösungen verschiedener Konzentration, Temperatur und Begasung dienten der Ermittlung des Einflusses der Probenvorbehandlung, des Sauerstoffangebotes an der Werkstoffoberfläche, der Art der Lastaufbringung und der Wirkung verschiedener metallischer Überzüge auf die Lebensdauer von austenitischen Chrom-Nickel-Stählen. Außerdem wurden Möglichkeiten zur Erzielung einer besseren Reproduzierbarkeit der Ergebnisse z. B. durch Senkung der MgCl2,- Konzentration und durch Vorgabe bestimmter Sollpotentiale oder Außenströme untersucht.Mit Hilfe von Stromdichte-Potential-kurven wurde das Verhalten der einzelnen Stähle in verschiedenen MgCl2-Lösungen studiert.
    Additional Material: 16 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/maco.19700210607
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  • 8
    Electronic Resource
    Electronic Resource
    Ein neuer ultrahochfester schweißbarer Baustahl (1965)
    Weinheim [u.a.] : Wiley-Blackwell
    Materials and Corrosion/Werkstoffe und Korrosion 16 (1965), S. 27-31 
    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: A new weldable ultra high strength steelThe paper deals with a new maraging steel containing 18% Ni, 7% Co, and 5% Mo.The material can easily be machined and formed in the annealed martensitic condition and welded without difficulties. Containing maximum 0,03%C the material is practically free of carbon and requires a simple aging treatment at 480°C in order to achieve its high strength of more than 180 kp/mm2/. The aging treatment leads to precipitation of intermetallic phases. The steel is also weldable in the maraged condition. In order to achieve a strength efficiency of 0,95 in the weldments, only a repeated aging treatment at 480°C is necessary.
    Notes: Es wird ein neuer martensitaushärtbarer Stahl mit (%) 18 Ni, 7 Co und 5 Mo beschrieben, der im weichen martensitischen Zustand gut spanlos und spanabhebend bearbeitbar und schweißbar ist.Der Werkstoff ist mit maximal 0,03%C praktisch kohlenstoff frei und erfordert zur Erzielung seiner hohen Festigkeit von über 180 kp/mm2/ eine einfache Warmauslagerung bei 480°C, wobei sich intermetallische Phasen ausscheiden. Das Schweißen kann auch im ausgehärteten Zustand erfolgen. Zum Erreichen einer Schweißnahtwertigkeit von 0,95 ist nach dem Schweißen nur eine erneute Warmauslagerung bei 480°C erforderlich.
    Additional Material: 10 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/maco.19650160106
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  • 9
    Electronic Resource
    Electronic Resource
    Zur Riß- und Bruchausbildung bei austenitischen Cr—Ni-Stählen unter spezifischen Bedingungen der Spannungs- und Schwingungsrißkorrosion (1972)
    Weinheim [u.a.] : Wiley-Blackwell
    Materials and Corrosion/Werkstoffe und Korrosion 23 (1972), S. 356-364 
    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: Crack and fracture formation in austenitic CrNi steels in the specific conditions of stress corrosion cracking and corrosion fatigueEven in media producing stress corrosion craking the fatigue component dominates at frequencies around 50 Hz and is noticable at frequencies as low as 30 Hz. A typical feature of such failures is the appearance of intercrystalline fracture regions in the range of low crack propagation velocities. With decreasing tolerable load the fatigue component effect gradually disappears and crack formation is initiated by localized attack from the surrounding medium.
    Notes: Auch in Medien, welche Spannungsriß-korrosion hervorrufen, dominiert die Schwingungsrißkorrosionskomponente bei Frequenzen um 50 Hz; sie ist auch noch bei Schwingungen um 30 Hz merklich. Ein Charakteristikum derartiger Schäden ist das Auftreten interkristalliner Bruchbereiche im Gebiete niedriger Rißausbreitungsgeschwindigkeiten. Mit abnehmender ertragener Belastung ver schwindet die Ermüdungskomponente allmählich, und die Rißbildung wird durch vom umgebenden Medium ausgebenden örtlichen Angriff ausgelöst.
    Additional Material: 11 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/maco.19720230506
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  • 10
    Electronic Resource
    Electronic Resource
    Kathodischer Schutz bei Schwingungsrißkorrosion (1973)
    Weinheim [u.a.] : Wiley-Blackwell
    Materials and Corrosion/Werkstoffe und Korrosion 24 (1973), S. 774-781 
    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: Cathodic protection during corrosion fatigueThe reactions taking place during corrosion fatigue in the active state may be inhibited, at application of cathodic protection. Galvanostatic circuiting is to be preferred to the potentiostatic system. Protection conditions depend from the aggressivity of the electrolyte, the resistance of the material and the flow conditions at the material surface, but scarcely from electrolyte conductivity. Since the incubation period is influenced by cathodic protection in a more pronounced way than crack propagation it may be assumed that cathodic protection gives rise to an initial inhibition of the aggressivity of the medium. Only when the effect of cathodic protection is lost and corrosion fatigue proceeds in a normal way.
    Notes: Die bei der Schwingungsrißkorrosion im aktiven Zustand ablaufenden Reaktionen können durch kathodischen Schutz zumindest im Anfangsstadium gehemmt werden. Die galvanostatische Außenschaltung ist dabei der potentiostatischen vorzuziehen. Die Schutzbedingungen sind abhängig von der Aggressivität des Elektrolyten und der Beständigkeit des Werkstoffs sowie den Strömungsverhältnissen an der Werkstoffoberfläche, kaum jedoch von der Elektrolytleitfähigkeit. Da die Inkubationsphase bei kathodischem Schutz stärker beeinflußt wird, als das weitere Rißwachstum, ist anzunehmen, daß durch den kathodischen Schutz die Korrosionswirkung des Mediums zunächst gehemmt ist. Erst wenn die Risse eine bestimmte Tiefe erreicht haben, verliert der kathodische Schutz seine Wirkung und die Schwingungsrißkorrosion nimmt ihren normalen Verlauf.
    Additional Material: 10 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/maco.19730240903
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