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  • 1985-1989  (18)
  • Polymer and Materials Science  (16)
  • Age  (1)
  • Nitrosomonas europaea  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Pharmakokinetik und Pharmakodynamik von Theophyllin bei multimorbiden geriatrischen Patienten (1987)
    Springer
    Journal of molecular medicine 65 (1987), S. 551-557 
    Details
    ISSN: 1432-1440
    Keywords: Theophylline ; Age ; Multimorbidity ; Pharmacokinetics ; Pharmacodynamics
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary The pharmacokinetics of theophylline (200 mg i.v.) were determined in 20 geriatric patients with multiple diseases. Serum concentrations were fitted to an open 2-compartment model. Percent changes in venous pCO2 and pO2 were used as parameters of the pharmacodynamic action. Total clearance was decreased and elimination half-life of theophylline was found to be prolonged in the elderly patients compared with data of a study with young healthy volunteers. The stronger the pharmacodynamic action of theophylline (percent change of venous pCO2 after 30 min), the faster was its elimination and the lower were measured concentrations after 2, 6, and 12 h.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01727621
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  • 2
    Electronic Resource
    Electronic Resource
    Degradation of the nitrification inhibitor 1-amidino-2-thiourea in soils, and its action in Nitrosomonas pure culture and soil incubation experiments (1989)
    Springer
    Nutrient cycling in agroecosystems 19 (1989), S. 13-19 
    Details
    ISSN: 1573-0867
    Keywords: 1-amidino-2-thiourea ; 3,5-diamino-1,2,4-thiadiazole ; dicyandiamide ; thiourea ; nitrification inhibitor ; urea ; ammonium sulfate ; Nitrosomonas europaea ; N-fertilizer
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract The degradation of guanylthiourea (GTU) via 3,5-diamino-1,2,4-thiadiazole (TDZ) to dicyandiamide (DCD) was studied in selected soils. All three compounds could be determined by HPLC. GTU decomposed rapidly (within hours-days), the reaction from TDZ to DCD continued more slowly (within days-weeks). Soil type and temperature had an essential effect on the rate of degradation; conspicuous was a more rapid breakdown of GTU in presence of ammonium sulfate (AS) than in combination with urea. Each compound is a nitrification inhibitor; inNitrosomonas cell suspensions, 0.5 ppm GTU and 10 ppm TDZ achieved an effect comparable to 200 ppm DCD. The combination of these two effects—degradation in soil and inhibition of nitrification—were studied in soil incubation experiments. The three substances had inhibitory effects also in soil, however at significantly different application rates (20 ppm GTU or TDZ and 30 ppm DCD). Using these concentrations, AS/DCD and urea/GTU showed similar effects. Urea/GTU retarded nitrification by the factor 1.7 as compared to urea/DCD. AS/GTU had no advantage over AS/DCD which can be explained by the more rapid degradation of GTU in presence of AS. Urea/GTU apparently presents a promising possibility to utilize N-fertilizers more efficiently.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01080681
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  • 3
    Electronic Resource
    Electronic Resource
    Monte-Carlo-Simulation der geometrischen Struktur von Cyanurat-Oligomeren (1987)
    Weinheim : Wiley-Blackwell
    Acta Polymerica 38 (1987), S. 655-658 
    Details
    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: The average bond lengths and bond angles of the structural units of polycyanurates synthesized by polycyclotrimerization of 2,2-bis(4-cyanatophenyl)propane were measured by single crystal X-ray analysis of model compounds. An off-lattice Monte Carlo model was developed for the simulation of the geometrical structure of cyanurate oligomers with polymerization degrees up to 31. Excluded volume effects were taken into account in the form of hard spheres. The calculated results show that an occurrence of intramolecular cyclizations, which was supposed in the literature, is possible.
    Notes: Die Größen der Bindungsabstände und -winkel der in Polycyanuraten auf Basis von 2,2-Bis(4-cyanatophenyl)propan auftretenden Strukturelemente wurden durch Röntgenkristallstrukturanalyse von Modellsubstanzen ermittelt. Darauf aufbauend wurde ein Monte-Carlo off-lattice Modell zur Simulation der geometrischen Struktur auftretender Oligomere bis zu einem Polymerisationsgrad 31 entwickelt, in dem Effekte des ausgeschlossenen Volumens in Form von hard-sphere Potentialen berücksichtigt sind. Die Ergebnisse belegen unter anderem die aus experimentellen Daten resultierende Vermutung des Auftretens intramolekularer Cyclisierungen.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/actp.1987.010381204
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  • 4
    Electronic Resource
    Electronic Resource
    Statistical structural model for the gelation behaviour of cyanate-epoxy polyreactions (1988)
    Weinheim : Wiley-Blackwell
    Acta Polymerica 39 (1988), S. 548-551 
    Details
    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: Unter Zugrundelegung der Kinetik der Hauptreaktionen bis zum Gelpunkt - Polycyclotrimerisierung der Cyanat-gruppe, Einschubreaktion des Glycidethers und Abspaltung eines Phenols - wurde mit Hilf der Kaskadentheorie ein statistisches Strukturmodell der Reaktion von Dicyanaten mit Bisglycidethern entwickelt. Es wurde gefunden, daß die Verschiebung des kritischen OCN-Umsatzes zu höheren Werten im Vergleich zu den klassischen 50% für die reine Polycyclotrimerisation in der Abspaltung eines Phenols mit dem Grundkörper des Cyanatmonomers begründet ist.
    Notes: Basing on the kinetics of the main reactions up to the gelation point - cyclotrimerization of the cyanate, insertion of the glycidylether group and abstraction of a phenol - a statistical structural model for the reaction of a dicyanate with a bisglycidylether was developed using a cascade approach. It was found that the critical OCN conversion shift to higher values compared with the classical 50% for the pure polycyclotrimerization is caused by the abstraction of the phenol with the aromatic rest of the cyanate monomer.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/actp.1988.010391004
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  • 5
    Electronic Resource
    Electronic Resource
    Reaktionen polyfunktioneller Cyansäureester mit polyfunktionellen Glycidethern. 1. Identifizierung der gebildeten StrukturelementeHerrn Professor Dr. Dr. h. c. Hermann Klare zum 80. Geburtstag gewidmet (1989)
    Weinheim : Wiley-Blackwell
    Acta Polymerica 40 (1989), S. 335-340 
    Details
    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: The chemical structures formed at the reaction of glycidylethers with aromatic cyanates were identified. In dependence on the molar ratio of the monomers, different parts of triazines, alkylisocyanurates, oxazolidinones, phenols, secondary hydroxyl groups, and double bonds were obtained.
    Notes: Die bei der Reaktion von Glycidethern und aromatischen Cyansäureestern gebildeten chemischen Strukturen wurden identifiziert. In Abhängigkeit vom Stoffmengenverhältnis der Monomere wurden unterschiedliche Anteile an Triazinen, Alkylisocyanuraten, Oxazolidinonen, Phenolen, sekundären Hydroxylgruppen und Doppelbindungen erhalten.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/actp.1989.010400509
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  • 6
    Electronic Resource
    Electronic Resource
    Analytik von Prepolymeren und Polymeren aromatischer Cyansäureester. 3. Differential Scanning CalorimetrieTeil 2: Acta Polymerica 37 (1986) 221-223. (1986)
    Weinheim : Wiley-Blackwell
    Acta Polymerica 37 (1986), S. 604-606 
    Details
    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: By DSC-experiments with constant heating rate or under isothermal conditions the complex character of the thermal polycyclotrimerisation of 2,2-bis(4-cyanatophenyl)propane in bulk is shown. An activation energy of 80 kJ/mol for the first order brutto kinetics is calculated by several methods.
    Notes: Aus DSC-Messungen mit konstanter Heizrate und unter isotherman Bedingungen wird der komplexe Charakter der thermischen Polycyclotrimerisierung von 2,2-Bis(4-cyanatophenyl)propan in der Schmelze ersichtlich. Für die Bruttoreaktion 1. Ordnung wird nach verschiedenen Auswertemethoden eine Aktivierungsenergie von 80 kJ/mol erhalten.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/actp.1986.010371002
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  • 7
    Electronic Resource
    Electronic Resource
    Analytik von Prepolymeren und Polymeren aromatischer Cyansäureester. 4. TitrationsmethodeTeil 3: Acta Polymerica 37 (1986) 604 (1986)
    Weinheim : Wiley-Blackwell
    Acta Polymerica 37 (1986), S. 654-654 
    Details
    ISSN: 0323-7648
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/actp.1986.010371013
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  • 8
    Electronic Resource
    Electronic Resource
    Reaktionen polyfunktioneller Cyansäureester mit polyfunktionellen Glycidethern. 2. ReaktionsmodellTeil 1: siehe [1] (1989)
    Weinheim : Wiley-Blackwell
    Acta Polymerica 40 (1989), S. 397-401 
    Details
    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: A model of the reaction between glycidylethers and aromatic cyanates is established. It was found that the trimerization of cyanates, the insertion of glycidylethers, the isomerisation of alkylcyanurates, the oxazolidinone build up, the abstraction of the phenols, and the phenol/glycidylether-addition are the main reactions.
    Notes: Ein Reaktionsmodell der Umsetzung von Glycidethern mit aromatischen Cyansäureestern wird begründet. Als Hauptreaktionen wurden die Trimerisierung der Cyansäureester, die Einschubreaktion der Glycidether in die Cyanuratstruktur, die Isomerisierung der Alkylcyanurate, die Oxazolidinonbildung, die Phenolabspaltung und die Phenol/Glycidether-Addition gefunden.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/actp.1989.010400608
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  • 9
    Electronic Resource
    Electronic Resource
    Cross-linked polymers - chemistry, properties, and applications. ACS Symposium Series 367. Hg. von R. A. DICKIE, S. S. LABANA, and R. S. BAUER. ISBN 0-8412-1471-9. Washington, D.C.: American Chemical Society 1988. IX, 492 S., geb., US $119.95 (1989)
    Weinheim : Wiley-Blackwell
    Acta Polymerica 40 (1989), S. 554-554 
    Details
    ISSN: 0323-7648
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/actp.1989.010400817
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  • 10
    Electronic Resource
    Electronic Resource
    Remark on the approximate character of the kinetic/structural model for the cyanate-epoxy network build-up (1989)
    Weinheim : Wiley-Blackwell
    Acta Polymerica 40 (1989), S. 679-680 
    Details
    ISSN: 0323-7648
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/actp.1989.010401016
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