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  • 1
    Electronic Resource
    Electronic Resource
    Verhalten von Chemieapparate-Werkstoffen bei höheren Temperaturen (1967)
    Weinheim [u.a.] : Wiley-Blackwell
    Materials and Corrosion/Werkstoffe und Korrosion 18 (1967), S. 112-116 
    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: Behaviour of materials for chemical apparatus at higher temperaturesFollowing an introductory survey of the essence and significance of static data (short-time and long-time tensile test at higher temperatures), the creep process associated with the latter is discussed and its effect on the service life of chemical apparatus indicated. On the basis of results of practical tests with nonferrous and ferrous metals, the statistical significance of conventional and desirable presentation results is discussed.
    Notes: Im Anschluß an einen einführenden Überblick über das Wesen und die Bedeutung statischer Kennzahlen (Kurzzeit- und Langzeit-Zugversuch bei höheren Temperaturen) wird der bei letzteren ablaufende Kriechvorgang erläutert und dessen Bedeutung für die „Laufzeit“ chemischer Apparate aufgezeigt. An praktischen Versuchsergebnissen (NE- und E-Metalle) wird die Aussagefähigkeit üblicher und zweckmäßiger Darstellungsmöglichkeiten Versuchsergebnisse diskutiert.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/maco.19670180204
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  • 2
    Electronic Resource
    Electronic Resource
    Das Korrosionsverhalten von Titan in Salpetersäure hoher Temperaturen (1964)
    Weinheim [u.a.] : Wiley-Blackwell
    Materials and Corrosion/Werkstoffe und Korrosion 15 (1964), S. 741-743 
    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: The corrosion resistance of titanium in nitric acid of high temperaturesCorrosion tests showed that, in nitric acid of a concentration ranging from 20 to 70 percent. and at temperatures ranging from 190 to 230° C, titanium has a corrosion rate of between 1 and 10mm pr. annum. This high corrosion rate can be avoided if a substance containing silicon is added to the nitric acid.
    Notes: Korrosionsversuche ergaben, daß Titan in Salpetersäure der Konzentrationen 20 bis 70% bei Temperaturen von 190 bis 230° C rnit Geschwindigkeiten zwischen 1 bis 10 mm/Jhr. abgetragen wird. Diese starke Korrosion läßt sich unterbinden, wenn der Salpetersäure eine siliciumhaltige-Substanz zugesetzt wird.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/maco.19640150906
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  • 3
    Electronic Resource
    Electronic Resource
    Chemische und elektrochemische Reaktionen von Eisensulfid und Mangansulfid in sauren und neutralen Lösungen (1981)
    Weinheim [u.a.] : Wiley-Blackwell
    Materials and Corrosion/Werkstoffe und Korrosion 32 (1981), S. 275-281 
    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: Chemical and electrochemical reactions of iron sulfide and manganese sulfide in acid and neutral solutionsThe reactions which occur upon corrosion of massive iron sulfide and manganese specimens in perchloric acid and in neutral sodium chloride solution were elucidated by measurements of current-potential curves and by coulometric and analytical investigations on the processes. In acids the sulfides are dissolved by prevailing chemical reaction under evolution of H2S. Upon applying anodic overpotentials electrochemical reactions occur simultaneously, however, with such low velocity that the contribution to corrosion of the sulfides is insignificant. Upon applying cathodic overpotentials some hydrogen discharge is observed on iron sulfide but not on manganese sulfide.In 3% sodium chloride solution both sulfides corrode very slowly upon anodic polarization, forming elementary sulfur according to MeS = Me2+ + S + 2e- (Me = Fe or Mn). At high anodic potentials additional oxidation reactions occur in which three-valent iron and tetravalent manganese ions as well as sulfite and sulfate ions are formed.Iron sulfide and manganese sulfide inclusions can he isolated from steels only by electrochemical dissolution in neutral or weakly basic electrolytes, the potential during electrolysis must not be more positive than the corrosion potential of the sulfides.
    Notes: Durch Messen von Stromdichte-Potentialkurven und coulometrisch-analytische Untersuchungen wurden die Korrosionsreaktionen kompakter Eisensulfid- und Mangansulfidproben in Perchlorsäure, und in neutraler Natriumchlöridlösung aufgeklärt. In Säuren lösen sich beide Sulfide weitgehend chemisch unter H2S-Entwicklung. Daneben laufen bei anodischer Überspannung elektrochemische Reaktionen mit so geringer Geschwindigkeit ab, daß sie nur einen unbedeutenden Beitrag zur Korrosion des Eisensulfids und Mangansulfids liefern. Kathodisch werden am Eisensulfid Wasserstoffionen entladen. Diese Reaktion ist am Mangansulfid praktisch nicht feststellbar.In dreiprozentiger Natriumchlöridlosung korrodieren die beiden Sulfide bei anodischer Überspannung elektrochemisch sehr langsam unter Bildung elementaren Schwefels nach MeS = Me 2+ + S + 2e-(Me = Fe oder Mn). Im Bereich hoher anodischer Polarisation treten zusätzliche Oxydationsreaktionen auf, durch die dreiwertiges Eisen bzw. vierwertiges Mangan sowie Sulfit- und Sulfationen entstehen. Eisensulfid und Mangansulfid können aus Stahlen nur durch elektrochemisches Lösen der Stahlmatrix in neutralen oder schwach basischen Lösungen isoliert werden. Außerdem soll das Elektrolysepotential nicht positiver als das Ruhepotential dieser Sulfide sein.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/maco.19810320605
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  • 4
    Electronic Resource
    Electronic Resource
    Untersuchungen über die Kathodenwirkung von Eisensulfid und Mangansulfid auf die Korrosion von Eisen in dreiprozentiger Natriumchloridlösung (1981)
    Weinheim [u.a.] : Wiley-Blackwell
    Materials and Corrosion/Werkstoffe und Korrosion 32 (1981), S. 540-545 
    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: Studies on the cathodic effect of iron sulfide and manganese sulfide on the corrosion of iron in a three percent sodium chloride solutionIn the galvanic element iron/sodium chloride solution/iron sulfide and in the element iron/sodium chloride solution/manganese sulfide, flushed with nitrogen or air, the sulfides become the cathode and the iron is anode. Upon short circuiting the electrodes a strong cathodic polarisation of the sulfides occurs. However, only if the iron is in contact with iron sulfide in the air-flushed sodium chloride solution the corrosion of the iron is enhanced because of considerable anodic polarisation. The corrosion of the iron electrode is increased corresponding to the increase in cathodic area.According to these results inclusions of iron sulfide or manganese sulfide act as local cathodes but cannot cause pitting corrosion of unalloyed steels in a neutral chloride solution.
    Notes: In den galvanischen Elementen Eisen/NaCl-Lösung/FeS und Eisen/NaCl-Lösung/MnS, durch die Stickstoff oder Sauerstoff strömt, stellen die Sulfide die Kathode und Eisen die Anode dar. Beim Kurzschließen der Elektroden werden die Sulfide stark kathodisch polarisiert. Das Eisen korrodiert aber lediglich im Kontakt mit Eisensulfid in belüfteter Natriumchloridlösung infolge merklicher anodischer Polarisation mit erhöhter Geschwindigkeit. Die gesteigerte Korrosion der Eisenelektrode entspricht aufgrund der reaktionsbestimmenden Sauerstoffdiffusion der Vergrößerung der kathodisch wirksamen Fläche.Nach diesen Ergebnissen können in unlegierten Stählen ausgeschiedene Eisensulfid- und Mangansulfideinschlüsse als Lokalkathoden keine Lochkorrosion in neutraler Natriumchloridlösung verursachen.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/maco.19810321205
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  • 5
    Electronic Resource
    Electronic Resource
    Modified monoclonal antibody production kinetics kappa/gamma mRNA levels, and metabolic activities in a murine hybridoma selected by continuous Culture (1994)
    New York, NY [u.a.] : Wiley-Blackwell
    Biotechnology and Bioengineering 44 (1994), S. 753-764 
    Details
    ISSN: 0006-3592
    Keywords: hybridoma ; subclone ; continuous culture ; batch culture ; igG-mRNA ; biosynthetic activities ; antibody production ; Chemistry ; Biochemistry and Biotechnology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: During long-term continuous culture of the hybridoma cell line 11317, a better-producing subclone (I1317-SF11), giving improved productivity, has been selected. The comparison of the original cell line (I1317-DC) with this subclone revealed that although the growth patterns of both clones were similar, both in continuous and in batch cultures, considerable differences could be seen between the clones with respect to monoclonal antibody (MAB) accumulation, MAB production rate, the levels of mRNA coding for heavy and light chains of IgG, and some metabolic activities. In continuous culture as well as in batch culture, I1317-SF11 showed increased levels of mRNA coding for kappa and gamma chains compared with I1317-DC and/or a modified ratio of the mRNA species when compared to that in I1317-DC. Using pulse experiments, it could be established that the biosynthesis of both chains was augmented in I1317-SF11. Although the kappa and gamma mRNA levels were modified or inversed for I1317-SF11, the cells always synthesized more kappa than gamma chains. The overall increase in the synthetic activity of I1317-SF11 is suggested as one reason for the considerable increase of IgG productivity and product accumulation in continuous culture as well as in repeated batch cultures. Tests concerning metabolic activity revealed that I1317-SF11 had a predominantly glycolytic metabolism independent of growth requirements, whereas for I1317-DC the metabolism became increasingly glycolytic with increased growth. The antibody yield coefficient of I1317-SF11 on glutamine was significantly higher than that of I1317-DC for the continuous culture, whereas the antibody coefficients on glucose were almost similar for both clones under the different culture conditions used. Both antibody coefficients were considerablly influenced by the specific growth rate.All these facts together lead to the conclusion that subclone I1317-SF11 uses more of the energy available, or it was the energy and/or precursors available for the synthesis and production of MAB more efficiently than the thesis and production of MAB more efficiently than the original cell line. Although the levels of mRNA coding for heavy and light chains of IgG were modified, it could be confirmed that the overall regulation of MAB-synthesis and -production occurs post-translationally and that at higher growth rates, more biosynthetic activity is diverted to biomass production. © 1994 John Wiley & Sons, Inc.
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bit.260440612
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  • 6
    Electronic Resource
    Electronic Resource
    Über Boroxol-Verbindungen Darstellung, physikalische und chemische Eigenschaften (1952)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 267 (1952), S. 1-26 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Die Reaktion, - B2O3 + BCl3 -, die zum Trichlorboroxol führt2), ist allgemeiner Anwendung bei den Halogeniden BF3, BCl3, BBr3 und Pseudohalogeniden wie z. B. B(OCH3)3, B[N(CH3)2]3 und B(CH3)3 fähig. Auf diesem Wege konnten in fast quantitativer Ausbeute die bei gewöhnlicher Temperatur stabilen Boroxole: Trimethyl-, Tri-dimethyl-amino-, Trimethoxy-boroxole und die nur bei höheren Temperaturen stabilen Trifluor-, Trichlor- und Tribrom-boroxole dargestellt werden. Letztere zersetzen sich beim Abkühlen über noch nicht gefaßte Zwischenstufen in die Ausgangsprodukte. Die Darstellung, sowie die chemischen und physikalischen Eigenschaften einschließlich der Molekulargewichte der Boroxolverbindungen werden mitgeteilt. Die Bildungsreaktion wird diskutiert. Eine abschließende Diskussion über die Struktur der Boroxole wird im Anschluß an die Veröffentlichung der RAMAN-Spektren der Boroxole gegeben werden.
    Additional Material: 13 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19522670102
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  • 7
    Electronic Resource
    Electronic Resource
    RAMAN-Spektren und Struktur von Boroxol-Verbindungen (1953)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 272 (1953), S. 303-312 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Es werden die RAMAN-Spektren von Trimethyl-, Tri-dimethylamino-, Trimethoxy-, Trichlor-boroxol und von B-Trimethylborazol mitgeteilt. Die Diskussion der spektralen Daten erbringt in Anlehnung an die gut untersuchten Spektren von 1,3,5-trisubstituierten Benzolen den sicheren Nachweis für einen ebenen Sechsring B3O3 in allen Boroxolverbindungen. Dieser liegt nach dem RAMAN-Spektrum auch im Dibortrioxyd vor.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19532720510
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  • 8
    Electronic Resource
    Electronic Resource
    Petrographische und chemische Untersuchungen zur Frage der Entstehung der Kohlen (1933)
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 501 (1933), S. 84-106 
    Details
    ISSN: 0075-4617
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 35 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jlac.19335010104
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  • 9
    Electronic Resource
    Electronic Resource
    Trigonal-planare CuX3-Gruppen in Cu2Mo6X14, X = Cl, Br, IProfessor Herbert Jacobs zum 60. Geburtstag gewidmet (1996)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 622 (1996), S. 663-669 
    Details
    ISSN: 0044-2313
    Keywords: Dicopper(I)-octa-μ3-halogeno-hexahalogeno-octahedro-hexamolybdate(II) ; crystal structure ; Mo6X14-group ; trigonal planar CuX3-group ; ionic conduction ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Trigonal Planar CuX3-Groups in Cu2Mo6X14, X = Cl, Br, ICu2Mo6Cl14 (I), Cu2Mo6Br14 (II) and Cu2Mo6I14 (III) were synthesized by thermal treatment of corresponding mixtures of copper(I) and molybdenum(II) halides. The crystal structures were determined by single crystal X-ray analyses. I and II show isotypism, cubic, Pn3 (no. 201, sec. setting), Z = 4, I: a = 12.772(3) Å, II: a = 13.350(2) Å. III shows a new structural type, orthorhombic, Pbca (No. 61), Z = 4, a = 16.058(3) Å, b = 10.643(2) Å, c = 16.963(3) Å. Trigonal planar CuX3 units were found in I—III. Structural behaviour relations are discussed, especially with regard to ionic conductivity.
    Notes: Cu2Mo6Cl14 (I), Cu2Mo6Br14 (II) und Cu2Mo6I14 (III) wurden durch thermische Behandlung der Gemenge der binären Halogenide CuX und Mo6X12 im molaren Verhältnis 2:1 in einkristalliner Form erhalten. Röntgenographische Strukturbestimmung wurde an Einkristallen durchgeführt. I und II zeigen Isotypie, Pn3 (Nr. 201, sec. setting) Z = 4, I: a = 12,772(3) Å, II: a = 13,350(2) Å. III weist eigenen Strukturtyp auf: Pbca (Nr. 61), Z = 4, a = 16,058(3) Å, b = 10,643(2) Å, c = 16,963(3) Å. In I—III liegen trigonal planare CuX3-Gruppen vor. Bindungsverhältnisse und Meßergebnisse der Ionenleitfähigkeit werden diskutiert.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19966220415
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  • 10
    Electronic Resource
    Electronic Resource
    Darstellung und Kristallstruktur von TlPb8O4Br9Professor Rudolf Hoppe zum 60. Geburtstage gewidmet (1982)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 491 (1982), S. 191-198 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Preparation and Crystal Structure of TlPb8O4Br9Analytical characterisation and crystal structure determination of TlPb8O4Br9 is reported. This compound is related with the “R-Phase” of the PbO/PbBr2-system. The difference between the reported compound and the “R-Phase” is shown, although their is accordance of the lattice constants. X-ray investigations yield the following crystallographic data: tetragonal system, space group P4/n (No 85), crystal axis a = 12.337, c = 8.214 Å. The crystal structure is described and the observation of the isolated structure group [Pb8O4]8+ is pointed out.
    Notes: Die Verbindung TlPb8O4Br9 wird analytisch charakterisiert und mit der sogenannten R-Phase des Systems PbO/PbBr2 verglichen. Die ermittelte Kristallstruktur wird vorgestellt und diskutiert. Bemerkenswert ist das Auftreten von diskreten Baugruppen [Pb8O4]8+, die untereinander durch eine Bromidionenumgebung abgeschirmt sind. Kristallographische Daten: Tetragonales Kristallsystem, Raumgruppe P4/n (No. 85), a = 12,337, c = 8,214 Å. Es wird ausgeführt, daß die für die R-Phase genannte Zusammensetzung trotz annähernd gleicher Metrik nicht für die vorliegende Verbindung zutreffen kann.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19824910124
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