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  • 1
    Electronic Resource
    Electronic Resource
    Endgroup modification of unsaturated polyesters. Effect on chemical resistance (1965)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 9 (1965), S. 1681-1700 
    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: Endgroups of unsaturated polyesters formulated with mole ratios of 2/1/3 and 1/1/2 isophthalic acid/maleic anhydride/propylene glycol were modified. Carboxylic acid content was effectively reduced by esterification with alcohols or epoxides, amidation with phenyl isocyanate, or neutralization with amines. Hydroxyl content was reduced by esterification with acids or anhydrides and urethane formation with phenyl isocyanate. Chemical resistance was determined by measuring the decrease in flexural strength and modulus with exposure to 10% solutions of sodium hydroxide and sulfuric acid at 82°C. A 2-week test using the medium chemical-resistant 2/1/3 polyester indicated that any modification which decreased the carboxylic acid content improved chemical resistance. Modifications which increased or decreased the hydroxyl content had no significant effect in the 2-week tests; however, decrease of hydroxyl content appeared important in 6-month exposure tests. The 1/1/2 resins which have high initial chemical resistance had poorer chemical resistance after endgroup modification than the unmodified 1/1/2 resin, with the exception of the phenyl isocyanate-modified product which was equal to the unmodified resin. Water (0.8%) and xylene (0.1%) had no effect on chemical resistance. However, larger amounts of residual solvent were disadvantageous.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1965.070090507
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  • 2
    Electronic Resource
    Electronic Resource
    109. Ökologische Reststoffverwertung durch Kohle/Reststoff-Vergasung (1994)
    Weinheim : Wiley-Blackwell
    Chemie Ingenieur Technik - CIT 66 (1994), S. 1223-1224 
    Details
    ISSN: 0009-286X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cite.3306609110
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  • 3
    Electronic Resource
    Electronic Resource
    13. Betriebserfahrungen bei der Klärschlammvergasung (1996)
    Weinheim : Wiley-Blackwell
    Chemie Ingenieur Technik - CIT 68 (1996), S. 1070-1070 
    Details
    ISSN: 0009-286X
    Keywords: Chemistry ; Industrial Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cite.330680915
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  • 4
    Electronic Resource
    Electronic Resource
    Cyclic nucleotides and cell growth (1976)
    New York, N.Y. : Wiley-Blackwell
    Journal of Supramolecular Structure 4 (1976), S. 279-287 
    Details
    ISSN: 0091-7419
    Keywords: Life Sciences ; Molecular Cell Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Chemistry and Pharmacology , Medicine
    Notes: Growth induction in resting fibroblast cultures by serum or growth factors induces a fast, transient cGMP peak which may constitute the intracellular signal for growth. A similar cGMP peak occurs when 3T3 cells arrested at the restriction point or in G0 by starvation for certain amino acids are induced for growth by readdition of the lacking nutrients. Both 3T3 and SV3T3 cells which are arrested randomly all around the cell cycle do not exhibit major changes in cyclic nucleotides after growth induction.Determination of intracellular cAMP and cGMP levels in normal and transformed fibroblasts under different growth conditions shows that the transition between growing and resting state (G0 arrest) is accompanied and probably induced by characteristic changes in cAMP to cGMP ratios. cGMP is decreased 2-5-fold in resting as compared to growing cultures, and increased 10-20-fold in activated cultures 20 min after serum induction. No major cGMP change was observed in growing, confluent, or serum-activated cultures of transformed cells.Measurement of guanylcyclase under unphysiological conditions (2 mM Mn++) in crude and purified membranes from 3T3 and SV3T3 cultures did not show increased enzyme activity in the transformed cells. Significant differences may only show up when synchronized cells pass through the restriction point in G1 phase. As a hypothesis it is proposed that transformed cells have an activated guanylcyclase system or a relaxed cGMP-pleiotypic response mechanism at the restriction point of their cell cycle.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jss.400040214
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  • 5
    Electronic Resource
    Electronic Resource
    Über den Harz- und Wachsgehalt der Traubenbeeren von amerikanischen Reben (1892)
    Weinheim : Wiley-Blackwell
    Zeitschrift für die chemische Industrie 5 (1892), S. 417-417 
    Details
    ISSN: 0044-8249
    Keywords: Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/ange.18920051402
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  • 6
    Electronic Resource
    Electronic Resource
    Beziehungen zwischen Lumineszenzspektrum und Struktur von Seltenerdkomplexen. I. Quadratisch-antiprismatisch koordinierte Pyridin-N-Oxid-Komplexe des Europium(III) (1969)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 368 (1969), S. 133-143 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: From the luminescence spectra of the solid complex of Eu(pyO)8X3 (X = Cl-, Br-, J- ClO4-) the parameters B1m (1 = 2 und 4) are calculated by the method of equivalent operators. The splitting of therms and the intensities of the transitions indicate that the Eu(III) ion is in a site with D4d-Symmetry, weakly distorted to D2d. As is shown, the axial parameters B10 are influenced by the potential of the anions. Therefore these parameters are not suitable to estimate the angle θ in the antiprism.
    Notes: Aus dem Lumineszenzspektrum der festen Komplexe Eu(pyO)8X3 (X = Cl-, Br-, J-, ClO4-) wurden nach der Methode der äquivalenten Operatoren die Parameter B1m für 1 = 2 und 4 berechnet. Aufspaltungsenergien und Intensitätsverhältnisse stimmen mit dem Vorliegen einer in Richtung D2d gestörten D4d-Symmetrie (quadratisches Antiprisma) überein. Die axialen Parameter B10 werden jedoch stark durch das Potential der Anionen beeinflußt und sind dadurch zur Abschätzung des θ-Winkels nicht unmittelbar brauchbar.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19693680305
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  • 7
    Electronic Resource
    Electronic Resource
    Beziehungen zwischen Lumineszenzspektrum und Struktur von Seltenerdkomplexen. II. Oktaedrisch koordinierte Hexahalogenokomplexe des Europium(III) (1971)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 380 (1971), S. 189-195 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: The analysis of the luminescence spectra of the pyridinium hexahalogeno complexes of europium(III) (PyH)3EuCl6 and (PyH)3EuBr6 is in accordance with the presence of a weakly distorted octahedral symmetry at the rare earth site. The parameters calculated from the splitting of the 7F2-level, \documentclass{article}\pagestyle{empty}\begin{document}$ {\rm B}_{{\rm 40}} {\rm (EuCl}_{\rm 6} {\rm - - -) = 159 \pm 4 und B}_{{\rm 40}} {\rm (EuBr}_{\rm 6} {\rm - - -) = 152 \pm 4 cm}^{- {\rm 1}} {\rm,} $\end{document} are about four to five times larger than the parameters calculated theoretically from the electrostatic point-charge model.
    Notes: Aus einer Analyse der Lumineszenzspektren der Pyridinium-Hexahalogenokomplexe des Europium (III), (PyH)3EuCl6 und (PyH)3EuBr6, folgt das Vorliegen einer schwach gestört oktaedrischen Symmetrie des Feldes am Zentralion.Die aus der Aufspaltung des 7F2-Niveaus ermittelten Parameter des Ligandenfeldes, \documentclass{article}\pagestyle{empty}\begin{document}$ {\rm B}_{{\rm 40}} {\rm (EuCl}_{\rm 6} {\rm - - -) = 159 \pm 4 und B}_{{\rm 40}} {\rm (EuBr}_{\rm 6} {\rm - - -) = 152 \pm 4 cm}^{- {\rm 1}} {\rm,} $\end{document} sind etwa vier- bis fünfmal größer als die aus dem elektrostatischen Punktladungsmodell theoretisch berechneten Parameterwerte.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19713800209
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  • 8
    Electronic Resource
    Electronic Resource
    Beziehungen zwischen Lumineszenzspektrum und Struktur von Seltenerdkomplexen. III. Zur Existenz unterschiedlicher Polyedertypen bei Alkalitetrakis(dibenzoylmethanato)europat(III)-KomplexenTeilergebnisse der Dissertation W. SEIFERT, Leipzig 1970. (1971)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 384 (1971), S. 67-80 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: The luminescence spectra of alkali tetrakis(dibenzoylmethido)europate(III) complexes in the crystalline state at 77°K have been measured in the spectral region 510-640 nm. The spectra show the existence of different modifications of these compounds. The spectra of the β-forms are consistent with a site symmetry D2 at the Eu(III) ion, the spectra of the corresponding α-forms with a site symmetry D4. A conversion from the β-form into the α-form on heating is observed in some cases. The conversion involves a change from dodecahedral into antiprismatic coordination around the Eu(III) ion.
    Notes: Die Lumineszenzspektren von kristallinen Alkali-tetrakis(dibenzoylmethanato)eurapot(III)-Komplexen wurden bie 77°K im Spektralbereich 510 bis 640 nm aufgenommen. Aus der Analyse der Spektren ergibt sich die Existenz verschiedener Modifikationen. Die Spektren der β-Formen sind in Übereinstimmung mit der Symmetrie D2 des Feldes am Ort des Eu(III)-Ions, die der korrespondierenden α-Formen mit einer Symmetrie D4. Einige β-Formen wandeln sich beim Erhitzen in die α-Formen um. Die Umwandlung ist verbunden mit einem Wechsel von dominierend dodekaedrischer zu dominierend antiprismatischer Koordination.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19713840109
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