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  • Wiley-Blackwell  (45)
  • Wiley  (29)
  • 1980-1984  (74)
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  • 1
    Electronic Resource
    Electronic Resource
    HPLC on n-propyl picryl ether silica gel (1984)
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 7 (1984), S. 714-715 
    Details
    ISSN: 0935-6304
    Keywords: Liquid chromatography, HPLC ; Bonded phases ; Charge-transfer interaction ; n-Propyl picryl ether ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jhrc.1240071213
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  • 2
    Electronic Resource
    Electronic Resource
    Using 7-chlor-4-nitrobenzo-2-oxa-1,3-diazole for mass spectrometric and gas. Chromatographic mass spectrometric analysis of N-nitrosamines in environmental samples (1981)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 8 (1981), S. 480-484 
    Details
    ISSN: 1052-9306
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: A mass spectrometric method for quantitative determination of volatile N-nitrosamines, based on analysis of the derivatives formed from secondary amines produced by denitrosation of N-nitrosamines when they are reacted with 7-chlor-4-nitrobenzo-2-oxa-1,3-diazole, is proposed. The method has been applied to the quantitative analysis of 3-4 component mixtures of N-nitrosamines without preliminary separation. The detection limit was 1 ng with a relative standard deviation of 0.13-0.25. A gas chromatographic mass spectrometric method for the identification and quantification of multicomponent mixtures of N-nitrosamines was also developed with a detection limit of 1 ng μ1-1 and relative standard deviation of 0.11-0.22. These methods are recommended for N-nitrosamine determination in environmental samples and have the advantage that the standards can be prepared not from carcinogenic N-nitrosamines, but directly from the respective secondary amines.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bms.1200081003
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  • 3
    Electronic Resource
    Electronic Resource
    Analysis of N-nitrosamines in environmental samples by mass spectrometry and gas chromatography mass spectrometry of dansyl derivatives (1980)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 7 (1980), S. 354-358 
    Details
    ISSN: 1052-9306
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Reaction of 1-dimethylaminonaphthalene-5-sulphonyl chloride with the secondary amines produced by denitrosation of N-nitrosamines yields dansyl-amides suitable for the mass spectrometric determination of N-nitrosamines. The method has been applied to the quantitative analysis of 3-4 component mixtures of N-nitrosamines. The detection limit was 1 ng with a relative standard deviation of 0.15-0.31. A gas chromatographic mass spectrometric method for the identification and quantification of mixtures of N-nitrosamines was also developed with a detection limit of 1 ng μl-1 and relative standard deviation of 0.12-0.23. These methods are recommended for N-nitrosamine determination in environmental samples and have the advantage that the internal standard can be prepared directly from the respective secondary amine.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bms.1200070808
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  • 4
    Electronic Resource
    Electronic Resource
    Calcium uptake by isolated rat intestinal cells (1983)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Cellular Physiology 116 (1983), S. 322-328 
    Details
    ISSN: 0021-9541
    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Medicine
    Notes: Intestinal cells were isolated by a combination of mechanical and enzymatic means, and their calcium uptake was assayed by a rapid filtration procedure. Calcium uptake was a time- and concentration-dependent process that was markedly elevated at 25 and 37°C, as compared to 0°C. Cells isolated from rat duodenum exhibited higher uptakes than cells from jejunum, which in turn took up more calcium than cells from the ileurn. Duodenal cells from vitamin D-deficient animals took up less calcium than cells from vitamin D-replete cells. In vivo vitamin D repletion with 1,25-dihydroxyvitamin D3 raised calcium uptake by duodenal cells from treated animals toward that of cells from replete rats. Furthermore, calcium uptake by duodenal cells from vitamin D-deficient animals approximated that of ileal cells from replete rats. These findings with isolated cells parallel prior findings of tissue calcium transport and suggest that cellular calcium uptake may be related to the saturable component of intestinal calcium absorption. Isolated intestinal cells may therefore constitute one experimental model for the study of transcellular calcium transport.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jcp.1041160309
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  • 5
    Electronic Resource
    Electronic Resource
    Sequence distribution and glass transition of vinyl alcohol/n-alkyl vinyl carbonate copolymers (1984)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 185 (1984), S. 2153-2159 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: 13C NMR spectroscopy was used for the determination of the sequence distribution in vinyl alcohol-ethyl vinyl carbonate copolymers prepared by reaction of poly(vinyl alcohol) with ethyl chloroformate. The 13C NMR spectra of the methylene carbons in the main chain show three split peaks whose intensities change with copolymer composition. These peaks can be assigned to the three dyad sequences. The obtained results show that ethyl vinyl carbonate units have an alternating tendency in the copolymer chain. The Tg values of the vinyl alcohol-ethyl vinyl carbonate and vinyl alcohol-butyl vinyl carbonate copolymers are influenced by both the overall copolymer composition and the monomer sequence distribution.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1984.021851010
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  • 6
    Electronic Resource
    Electronic Resource
    Statische Mischerpackungen für Gegenstrom-ExtraktionskolonnenVortrag auf dem Jahrestreffen der Verfahrens-Ingenieure, 29. Sept. bis 1. Okt. 1982 in Basel. (1983)
    Weinheim : Wiley-Blackwell
    Chemie Ingenieur Technik - CIT 55 (1983), S. 398-399 
    Details
    ISSN: 0009-286X
    Keywords: Mischerpackung ; Gegenstromextraktion ; Hydrodynamik ; Trennwirkung ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cite.330550523
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  • 7
    Electronic Resource
    Electronic Resource
    Statische Mischer mit großer AnpassungsfähigkeitVortrag auf dem Jahrestreffen der Verfahrens-Ingenieure, 26. bis 28. Sept. 1979 in Nürnberg. (1980)
    Weinheim : Wiley-Blackwell
    Chemie Ingenieur Technik - CIT 52 (1980), S. 520-522 
    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
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cite.330520608
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  • 8
    Electronic Resource
    Electronic Resource
    Hydrodynamisches Prinzip zur Erzielung einer Arzneiform mit gesteuerter Wirkstoff-FreisetzungVortrag auf dem Jahrestreffen der Verfahrens-Ingenieure, 29. Sept. bis 1. Okt. 1982 in Basel. (1983)
    Weinheim : Wiley-Blackwell
    Chemie Ingenieur Technik - CIT 55 (1983), S. 476-478 
    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
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cite.330550610
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  • 9
    Electronic Resource
    Electronic Resource
    Conformational studies of peptides: Crystal and molecular structures of L-3,4-dehydroproline and its t-butoxycarbonyl and acetyl amide derivatives (1981)
    New York : Wiley-Blackwell
    Biopolymers 20 (1981), S. 283-302 
    Details
    ISSN: 0006-3525
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The crystal structures of L-3,4-dehydroproline, t-butoxycarbonyl-L-3,4-dehydroproline amide, and acetyl-L-3,4-dehydroproline amide have been determined. L-3,4-Dehydroproline is orthorhombic with a = 16.756, b = 5.870, c = 5.275 Å, and Z = 4; t-butoxycarbonyl-L-3,4-dehydroproline amide is orthorhombic with a = 6.448, b = 8.602, c = 21.710 Å, and Z = 4; acetyl-L-3,4-dehydroproline amide is monoclinic with a = 4.788, b = 10.880, c = 7.785 Å, β = 105.25°, and Z = 2. The final R value for the L-3,4-dehydroproline is 0.046 based on 529 reflections; for t-butoxycarbonyl-L-3,4-dehydroproline amide, 0.050 based on 792 reflections; and for acetyl-L-3,4-dehydroproline amide, 0.058 based on 632 reflections. The structures clearly establish that the free amino acid exists in the zwitterionic form in the crystalline state. The molecular conformations of the t-Boc and acetyl derivatives consist of two planes: one involving the primary amide and the other the remaining atoms of the molecule. The acetyl-L-3,4-dehydroproline amide contains a tertiary amide bond in the cis conformation. To the best of our knowledge, this is the first example of a cis bond in an acetyl derivative of an amino acid or peptide. At variance with the previously reported proline amides, which present φ and ψ values corresponding to those of a right-handed α-helical conformation (conformation A), the t-Boc and acetyl derivatives both have φ and ψ values corresponding to a collagenlike conformation (conformation F).
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bip.1981.360200204
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  • 10
    Electronic Resource
    Electronic Resource
    Cluster-Konstruktion: Synthese von Vierkernclustern durch Aggregation (1983)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 116 (1983), S. 3774-3793 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Cluster Construction: Synthesis of Tetranuclear Clusters via AggregationTrinuclear clusters with EM3 frameworks (1-3, EM3 = SFeCo2, SRuCo2, PFeCo2, CCo3) can be connected via CO substitution with AsM′ units (M′ = Cr, Mo, W). The EM3-AsM′ intermediates 7-10 eliminate CO under appropriate conditions to form clusters 13-16 with tetrahedral M3M′ frameworks which bear ų3-E and ų2-AsMe2 ligands. The combinations M3M′ = FeCo2Mo, FeCo2W, RuCo2Mo, RuCo2W, Co3Mo, and Co3W were realized. Starting from trinuclear clusters 4, 5 with the chiral frameworks EM3 = SFeCoMo, SFeCoW, SRuCoMo, and SRuCoW by the same procedure via 11, 12 tetranuclear clusters 17, 18 with the frameworks M3M′ = FeCoMo2, FeCoW2, FeCoMoW, RuCoMo2, RuCoW2, and RuCoMoW are obtained. Among these are the first two clusters with four different metal atoms. The crystal structures of FeCo2MoS(AsMe2)Cp(CO)8 (13a), RuCo2MoS(AsMe2)Cp(CO)8 (14a), and FeCoMoWS-(AsMe2)Cp2(CO)7 (17b) were determined. The tetranuclear clusters show ligand fluxionality as shown by dynamic 1H NMR spectroscopy.
    Notes: An Dreikerncluster mit EM3-Gerüst (1-3, EM3 = SFeCo2, SRuCo2, PFeCo2, CCo3) lassen sich durch CO-Substitution AsM′-Einheiten (M′ = Cr, Mo, W) anbinden. Die EM3-AsM′-Zwischenstufen 7-10 spalten unter geeigneten Bedingungen CO ab, wobei Cluster 13-16 mit tetraedrischem M3M′-Gerüst entstehen, welches ų3-E- und ų-AsMe2-Liganden trägt. Es wurden die Kombinationen M3M′ = FeCo2Mo, FeCo2W, RuCo2Mo, RuCo2W, Co3Mo und Co3W verwirklicht. Ausgehend von Dreikernclustern 4, 5 mit den chiralen Gerüsten EM3 = SFeCoMo, SFeCoW, SRuCoMo und SRuCoW entstehen auf die gleiche Weise über 11, 12 Vierkerncluster 17, 18 mit den Gerüsten M3M′ = FeCoMo2, FeCoW2, FeCoMoW, RuCoMo2, RuCoW2, und RuCoMoW. Unter diesen sind die beiden ersten Cluster mit vier verschiedenen Metallatomen. Von FeCo2MoS(AsMe2)Cp(CO)8 (13a), RuCo2MoS(AsMe2)Cp(CO)8 (14a) und FeCoMoWS-(AsMe2)Cp2(CO)7 (17b) wurden die Kristallstrukturen bestimmt. Die Vierkerncluster zeigen eine Ligandenfluktuation, die durch dynamische 1H-NMR-Spektroskopie zu erfassen ist.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19831161203
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