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  • 1
    Electronic Resource
    Electronic Resource
    Weinheim [u.a.] : Wiley-Blackwell
    Materials and Corrosion/Werkstoffe und Korrosion 20 (1969), S. 206-208 
    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: Electro-chemical examination of solutions containing inhibitors for temporary corrosion protectionThe products of lubricant type hitherto mainly used for temporary corrosion protection are increasingly superseded by aqueous solutions. Potentiostatic examinations have shown that solutions containing ammonium oxalate, sodium oxalate or sodium nitrite  -  possibly with an admixture of starch or glycerine  -  are suitable for this purpose. The action mechanism shows fairly great differences. Whilst the inhibiting effect of sodium oxalate is confined to the cathodic reaction, the effect of ammonium oxalate also extends to the anodic reaction. Ammonium oxalate is much more effective than sodium nitrite. It has not yet been possible to establish with certainty whether the protective effect is due to the formation of an oxa-late film, or to the adsorption of the oxalate ions, or to the reaction with oxygen.
    Notes: Statt der bisher meist verwendeten schmierstoffähnlichen Produkte fü den zeitweiligen Korrosionsschutz finden zunehmend wäßrige Lösungen Anwendung. Potentiostatische Untersuchungen haben gezeigt, daß Lösungen mit Ammoniumoxalat, Natriumoxalat oder Natriumnitrit, gegebenenfalls mit Zusatz von Stärke oder Glycerin, für diesen Zweck geeignet sind. Der Wirkungsmechanismus ist ziemlich verschieden. Während Natriumoxalat nur die kathodische Reaktion inhibiert, erstreckt sich die Wirkung von Ammoniumoxalat ist dabei wesentlich wirksamer als Natriumnitrit. Ob die Schutzwirkung bedingt ist durch Bildung einer Oxalatschicht, Adsorption der Oxalation oder Bindung von Sauerstoff, konnte noch nicht eindeutig entschieden werden.
    Additional Material: 4 Ill.
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  • 2
    Electronic Resource
    Electronic Resource
    New York, NY [u.a.] : Wiley-Blackwell
    Biotechnology and Bioengineering 39 (1992), S. 108-112 
    ISSN: 0006-3592
    Keywords: Chemistry ; Biochemistry and Biotechnology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: A new process for embedding cells in agarose is described. Beads were obtained by extruding an ultralow gelling temperature agarose solution in a capillary containing a hydrophobic medium flowthrough. The toxicity of the procedure has been evaluated by monitoring the energy status of agarose-embedded C6 glioma cells with 31P nuclear magnetic resonance (NMR). Suspension and microbead cultures of hybridoma cell line were compared. In suspension culture the number of cells and the antibody concentrations increased for 5 days before the stationary phase began, when the cultures were stopped. In agarose bead cultures, the gel provided an enormous support surface area (50 m2/ mL of gel). It was possible to seed 20-fold more cells. The gel pressure modified the proliferative process and antibody pattern secretion. In particular, the antibodies could be harvested for two weeks.
    Additional Material: 4 Ill.
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  • 3
    ISSN: 0899-0042
    Keywords: amino acids ; chiral rhodium complexes ; aminophosphine-phosphinite ; D- and L-enantiomers ; NMR spectra ; Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Substituted N-Cbz and N-Boc protected arylamino acrylic acids and esters have been prepared and used in asymmetric hydrogenations catalyzed by PROPRAPHOSRh. Stereoselectivities 〉 90% ee could be achieved, the rate of which is dependent on the position of the substituent in the aromatic ring. The N-Boc derivatives provide advantages compared with the N-Cbz analogues. The amino acid derivatives were fully characterized by 19F, 13C, and 1H NMR spectroscopy. © 1996 Wiley-Liss, Inc.
    Additional Material: 12 Tab.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Acta Polymerica 42 (1991), S. 39-42 
    ISSN: 0323-7648
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Das thermomechanische Verhalten einiger Polybutadien-Poly(butadien-co-styren)-Mischungen wurde untersucht. Eine Methode zur Vorhersage der Glasübergangstemperatur der Mischungen auf Basis der Ergebnisse der thermomechanischen Analyse wird vorgeschlagen.
    Notes: The thermomechanical behaviour of some polybutadiene-poly(butadiene-co-styrene) blends has been investigated. A method for the prognostication of glass transition temperature of the blends based on the data of thermomechanical analysis is proposed.
    Additional Material: 4 Ill.
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  • 5
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 540 (1986), S. 191-197 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: On the Thermal Decomposition of SrPO3F · H2OThe thermal decomposition of SrPO3F · H2O was investigated by complex thermal analysis. The thermogravimetric investigation has been completed by simultaneous and parallel mass spectrometric analysis of the gas phase. During the first state of thermal decomposition ∼0.8 mol water is lost. Then a partial hydrolysis takes place and HF is formed. The formation of POF3 is a multistage mechanism without influence of water at temperatures above 500°C. The partial reactions leading to α-Sr2P2O7 and SrF2 above 600°C and above 750°C to α-Sr2P2O7 and Sr5(PO4)3F have been formulated and the experimental and calculated mass loss have been compared.
    Notes: Der thermische Abbau Von SrPO3F · H2O wurde durch komplexe thermische Analyse charakterisiert. Dabei wurden die thermogravimetrischen Untersuchungen sowohl mit simultan als auch parallel durchgeführten massenspektrometrischen Gasanalysen kombiniert. Die thermische Zersetzung beginnt mit dem Verlust Von ∼0,8 mol Wasser, danach setzt partielle Hydrolyse unter Bildung Von HF ein. Die deutlich strukturierte POF3-Entstehung über 500°C bleibt jedoch weitgehend von der Dehydratisierung unbeeinflußt. Einzelne Teilreaktionen werden formuliert, die über 600°C zum α-Sr2P2O7 und SrF2 bzw. über 750°C zum α-Sr2P2O7 und Sr5(PO4)3F führen. Die entsprechend berechneten Massenverluste stimmen mit den experimentellen Werten überein.
    Additional Material: 2 Ill.
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  • 6
    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: N-Hydroxyisocaproyl (HIC) amino acids are obtained by heating glycine or leucine with isocaprolactone in molten imidazole. The N-protected acids were coupled with leucine methylester respectively tyrosine benzylester using the mixed anhydride method. The HIC-group can be removed as isocaprolactone by 50 percent trifluoro-acetic acid during several hours at room temperature. 3-Nitrophenoxycarbonyl-chloride (3-NPOC-chloride), synthesized from 3-nitrophenol and phosgene was reacted with phenylalanine to give the 3-NPOC-derivative. This has been coupled with glycin-methylester and with glycyl-alanine benzylester. The 3-NPOC-group can be split off by irradiation with light of λ- 290 mμ or with weak alcali, but in case of peptide derivatives only ninhydrine-negative products were formed.
    Notes: Aus Glycin- bzw. Leucin-natrium wurden durch Erhitzen mit Isocaprolacton in der Imidazolschmelze die N-γ-Hydroxyisocaproylderivate (HIC-Aminosäuren) erhalten. Nach der Anhydridmethode wurden sie zu HIC-Glycyl-leucinmethylester bzw. HIC-Leucyl-tyrosylbenzylester gekuppelt. Die Abspaltung des Restes als Isocaprolacton gelang z. B. durch mehrstündiges Aufbewahren der Peptidderivate in 50-proz. Trifluoressigsäure. Aus 3-Nitrophenol wurde mit Phosgen das 3-Nitrophenoxycarbonylchlorid (3-NPOC-Chlorid) hergestellt, das mit Aminosäuren in wäßriger Lösung in Gegenwart von MgO zu N-3-NPOC-Derivaten reagiert. Durch Peptidsynthese erhielt man 3-NPOC-Phenylalanyl-glycinmethylester und 3-NPOC-Phenylalanyl-glycylalanylbenzylester. Die Schutzgruppe läßt sich aus den Aminosäurederivaten durch Bestrahlen mit Licht von λ 〉 290 mμ oder durch schwaches Alkali abspalten, bei Peptiden entstehen bei dieser Abspaltung nur ninhydrinnegative Produkte.
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  • 7
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: From cultures of Myrothecium verrucaria (Albertini et Schweinitz) Ditmar ex Fries and Myrothecium roridum Tode ex Fries (Fungi imperfecti) a group of 10 new metabolites has been isolated in pure crystalline form and characterized by analytical and spectroscopic data: Verrucarin A (C27H34O9), B (C27H32O9), C, D, E, F, G, and Roridin A (C29H40-42O9), B (C28H46O?) and Roridin C. They are neutral lipophilic compounds. The main constituents, Verrucarin A and B and Roridin A, show in vitro antifungal and high cytostatic activity.
    Additional Material: 9 Ill.
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  • 8
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: From cultures of Myrothecium verrucaria (ALBERTINI et SCHWEINITZ) DITMAR ex FRIES and Myrothecium roridum TODE ex FRIES four additional metabolites have been isolated: verrucarin H (C29H36O8), verrucarin J (C27H32O8), roridin D (C29H38O9) and roridin E (C29H38O8). They are closely related to verrucarin A and B, since they contain the sesquiterpenoid alcohol verrucarol as structural element.
    Additional Material: 6 Ill.
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  • 9
    ISSN: 0006-3525
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: If one considers CD spectra as vectors, then a CD spectrum may be treated as a single parameter, every wavelength entering with the same weight. The representation of a set of spectra as a vector space and the problem of the linear independence of the concentrations are discussed. Three examples of vectorial interpretation are given: determination of the number of independent molecular species; determination of the stoichiometry of a complex; and graphical representation of the overall variation of a spectrum as a function of an external parameter.
    Additional Material: 4 Ill.
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  • 10
    Electronic Resource
    Electronic Resource
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 11 (1928), S. 1241-1252 
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
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