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  • 1990-1994  (8)
  • 1980-1984  (15)
  • Polymer and Materials Science  (18)
  • Auxin and stem growth  (2)
  • Cell cultures
  • Data regression
  • Ionogene substances
  • Life and Medical Sciences
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Material
Years
Year
Keywords
  • 1
    Electronic Resource
    Electronic Resource
    Die Berechnung komplexer Absorptionsgleichgewichte ionogener Substanzen in wäßrigen Lösungsmitteln mit Hilfe eines Reaktionsmodells (1982)
    Springer
    Monatshefte für Chemie 113 (1982), S. 1367-1392 
    Details
    ISSN: 1434-4475
    Keywords: Absorption equilibrium ; Data regression ; Ionogene substances ; Maximum likelihood principle ; Reaction equilibrium
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The solubility of ionogen substances in water and aqueous ionic solutions is important for calculation of absorption processes. Aqueous solutions with complex reaction systems behave themselves extremely nonideal. In simple cases equilibria can be determined with the concept of nonideal thermodynamics. The model used in this work is based on ideal calculation of reaction equilibria and gas solubility. The model parameters (equilibrium constants andHenry constants) for the systems SO2-H2O,MEA-H2S-H2O,DEA-H2S-H2O andMEA-CO2-H2O are computed by regression of experimental data. Equilibrium reactions are selected according toBrinkley's method. The selection of the reacting species has decisive influence on the accuracy of the data fitting. Data regression is done numerically and leads to the formulation of nonlinear systems of equations, which have to be solved for each data point. This solutions are performed in an inner loop. By using the maximum-likelihood-principle the model parameters are optimized in the superior regression loop. Experimental data for the regression are the partial pressure and the total concentration of gas in the liquid phase. The used model is able to fit these data satisfactoryly. The model parameters, which are calculated from simultaneous data regression for different temperatures, ensure a simple correlation ofvan't Hoff. However, for similar reactions equilibria in different reaction systems, it is impossible to compute the same values for the equilibrium constants.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00808937
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  • 2
    Electronic Resource
    Electronic Resource
    Indole-3-acetic acid levels after phytochrome-mediated changes in the stem elongation rate of dark- and light-grown Pisum seedlings (1992)
    Springer
    Planta 188 (1992), S. 85-92 
    Details
    ISSN: 1432-2048
    Keywords: Auxin and stem growth ; Epidermis and stem growth ; Pisum (stem growth) ; Phytochrome stem growth ; Stem elongation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The effect of red (R) and far-red (FR) light on stem elongation and indole-3-acetic acid (IAA) levels was examined in dwarf and tall Pisum sativum L. seedlings. Red light reduced the extension-growth rate of etiolated seedlings by 70–90% after 3 h, and this inhibition was reversible by FR. Inhibition occurred throughout the growing zone. After 3 h of R, the level of extractable IAA in whole stem sections from the growing zone of etiolated plants either increased or showed no change. By contrast, extractable IAA from epidermal peels consistently decreased 3 h after R treatments. Decreases of 40% were observed for epidermal peels from the top 1 cm of tall plants receiving 3 h R. Brief R treatments resulted in smaller decreases in epidermal IAA levels and these decreases were not as great when FR followed R. In lightgrown plants, end-of-day FR stimulated growth during the following dark period in a photoreversible manner. The uppermost 1 cm of expanding third internodes was most responsive to the FR. Extractable IAA from epidermal peels from the upper 1 cm of third internodes increased by 30% or more 5 h after FR. When R followed the FR the increases were smaller. Levels of IAA in whole stem sections did not change and were twofold greater than in dark-grown plants. In both dark- and light-grown tall plants, IAA levels were lower in epidermal peels than in whole stem segments. These results provide evidence that IAA is compartmentalized at the tissue level within the growing stem and that phytochrome regulation of stem elongation rates may be partly based on modulating the level of IAA within the epidermis.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00198943
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  • 3
    Electronic Resource
    Electronic Resource
    Indole-3-acetic acid levels after phytochrome-mediated changes in the stem elongation rate of dark- and light-grownPisum seedlings (1992)
    Springer
    Planta 188 (1992), S. 85-92 
    Details
    ISSN: 1432-2048
    Keywords: Auxin and stem growth ; Epidermis and stem growth ; Pisum (stem growth) ; Phytochrome stem growth ; Stem elongation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The effect of red (R) and far-red (FR) light on stem elongation and indole-3-acetic acid (IAA) levels was examined in dwarf and tallPisum sativum L. seedlings. Red light reduced the extension-growth rate of etiolated seedlings by 70–90% after 3 h, and this inhibition was reversible by FR. Inhibition occurred throughout the growing zone. After 3 h of R, the level of extractable IAA in whole stem sections from the growing zone of etiolated plants either increased or showed no change. By contrast, extractable IAA from epidermal peels consistently decreased 3 h after R treatments. Decreases of 40% were observed for epidermal peels from the top 1 cm of tall plants receiving 3 h R. Brief R treatments resulted in smaller decreases in epidermal IAA levels and these decreases were not as great when FR followed R. In lightgrown plants, end-of-day FR stimulated growth during the following dark period in a photoreversible manner. The uppermost 1 cm of expanding third internodes was most responsive to the FR. Extractable IAA from epidermal peels from the upper 1 cm of third internodes increased by 30% or more 5 h after FR. When R followed the FR the increases were smaller. Levels of IAA in whole stem sections did not change and were twofold greater than in dark-grown plants. In both dark- and light-grown tall plants, IAA levels were lower in epidermal peels than in whole stem segments. These results provide evidence that IAA is compartmentalized at the tissue level within the growing stem and that phytochrome regulation of stem elongation rates may be partly based on modulating the level of IAA within the epidermis.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01160716
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  • 4
    Electronic Resource
    Electronic Resource
    Monooxygenase and UDP-glucuronyltransferase activities in established cell cultures (1980)
    Springer
    Archives of toxicology 44 (1980), S. 85-98 
    Details
    ISSN: 1432-0738
    Keywords: Aryl hydrocarbon hydroxylase ; Cell cultures ; Drug-metabolizing enzymes ; Glucuronyltransferase ; 3-Hydroxy-benzo(a)pyrene ; Monooxygenases
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Cells in culture were investigated for the expression of monooxygenase and UDP-glucuronyltransferase activities as representatives of activating and inactivating pathways of drug metabolism. Most established cell lines express monooxygenase activity that is detected by the oxygenation of polycyclic hydrocarbons and appears to be a function of cytochrome P-448-dependent enzyme forms (Wiebel et al., 1977). In the hepatoma cell line, H-4-II-E, dexamethasone is capable of increasing the level of benzo(a)pyrene-monooxygenation about 10-fold and of potentiating its induction by benz(a)anthracene. The enzyme activities elicited by dexamethasone and the polycyclic hydrocarbon did not significantly differ in their response to 7,8-benzoflavone, an inhibitor of cytochrome P-448-dependent monooxygenases. Observations on the pattern of benzo(a)pyrene metabolites formed in benz(a)anthracene-treated H-4-II-E and BHK21(C13) cells indicate that established cell cultures may contain different forms of monooxygenases of the cytochrome P-448 type. The majority of cell lines tested express UDP-glucuronyltransferase activity directed toward the substrate, 3-hydroxybenzo(a)pyrene. No clear correlation appears to exist between the presence and level of monooxygenase and glucuronyltransferase activities in the various cell lines, i.e., the cultures may express any one or both enzymes. The ratio of the two enzyme levels can be modified by selective induction. Thus, at present there is a choice of established cells in culture exhibiting widely differing ratios of activating and inactivating enzymes to analyse the metabolic pathways of selected classes of foreign compounds, such as polycyclic hydrocarbons, and to determine their toxicological significance. Further efforts are likely to yield cell lines that express the enzymic functions lacking in the cultures currently used and will be suitable to study the full spectrum of foreign compounds.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00303185
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  • 5
    Electronic Resource
    Electronic Resource
    Spectral holes as probes for structural transitions in polymersVortrag anläßlich der Tagung der Fachgruppe “Makromolekulare Chemie” der Gesellschaft Deutscher Chemiker über “Polymere und Licht”. in Bad Nauheim vom 7. bis 9. Mai 1990. (1990)
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 183 (1990), S. 115-122 
    Details
    ISSN: 0003-3146
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: We show how narrow spectral holes burnt into the inhomogeneous absorption of dye doped polymers can be used as extremely sensitive detectors for measuring structural rearrangement processes. A model is suggested which relates the observed hole burning phenomena to the specific heat of the conformation phase space.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/apmc.1990.051830106
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  • 6
    Electronic Resource
    Electronic Resource
    Untersuchungen zur Plasmaätzung von Polymeren. IV. Selektives Plasmaätzen von Polyethylenen unterschiedlicher KristallinitätTeil III: Acta Polymerica 31 (1980) 59-62 (1980)
    Weinheim : Wiley-Blackwell
    Acta Polymerica 31 (1980), S. 310-315 
    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: Polyethylenes of different crystallinity and crosslinking were etched plasmachemically for revealing supermolecular structures. Electron microscopic patterns of the etched polymer surfaces show differences in the degree of crystallinity up to 3%.
    Notes: Polyethylenproben unterschiedlicher Kristallinität und Vernetzung wurden zur Freilegung übermolekularer Strukturen plasmachemisch geätzt. Die elektronemikroskopischen Aufnahmen der geätzten Polymeroberflächen zeigten, daß sich Unterschiede im Kristallinitätsgrad bis zu 3% im Ätzrelief widerspiegeln.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/actp.1980.010310506
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  • 7
    Electronic Resource
    Electronic Resource
    Untersuchungen zur Plasmaätzung von Polymeren. VI. Veränderungen an der Oberfläche von PolypropylenTeil V: Acta Polymerica 32 (1981) 48 (1981)
    Weinheim : Wiley-Blackwell
    Acta Polymerica 32 (1981), S. 337-343 
    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: As detected by photoelectron spectroscopy (ESCA) no saturation in concentration of N-containing groups occurs on the surface of polypropylene up to 50 minutes exposition in NH3 plasma. Under the particular conditions of the plasma the presence of amino groups is suggested. No large changes in structure of layers under the surface (up to 100 μm) were observed. The surface was roughed strongly by O2 plasma treatment. The etching patterns correspond to those of a predominantly monoaxialy stretched polymer.
    Notes: Bei der Behandlung von Polypropylenfolien im NH3-Plasma trat nach photoelektronenspektroskopischen Untersuchungen bis mindestens 50 min Behandlungszeit keine Sättigung der Konzentration an N-haltigen funktionellen Gruppen an der Polymeroberfläche ein. Bei den speziell gewählten Plasmabedingungen kann auf das Vorliegen von NH2-Gruppen geschlossen werden. Strukturelle Veränderungen in tieferliegenden Schichten traten kaum auf. Durch O2-Plasmabehandlung wurde die Folienoberfläche stark aufgerauht. Die Ätztruktur entsprach einem überwiegend monoaxial gereckten Polymer.
    Additional Material: 10 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/actp.1981.010320609
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  • 8
    Electronic Resource
    Electronic Resource
    Untersuchungen zum Einfluß einer Oberflächenmodifizierung von Fasermaterialien im nichtthermischen Plasma einer Hochfrequenz-Entladung auf die Adhäsionsfestigkeit zu Epoxidharz. Teil III: Ergebnisse der Behandlung von Kohlenstoff-Fasern im NH3-PlasmaTeil II: siehe [6] (1983)
    Weinheim : Wiley-Blackwell
    Acta Polymerica 34 (1983), S. 171-177 
    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: Carbon fibres were modified by different N containing groups at the surface in a nonthermal NH3-plasma. This was estimated by means of photoelectron spectroscopy. During the plasma exposition a layer of low molecular hydrogenated products formed at the surface. By plasma exposition the wetting of fibres with epoxy resin was increased.
    Notes: Kohlenstoff-Fasern wurden in einem nichtthermischen NH3-Plasma an der Oberfläche mit verschiedenartigen Nhaltigen Gruppen funktionalisiert, was mit Hilfe der Photoelektronenspektroskopie nachgewiesen wurde. Im Verlaufe der Plasmabehandlung entstand an der Faseroberfläche eine Schicht niedermolekularer, hydrierter Produkte. Die Benetzung der Fasern mit Epoxidharz wurde durch die Plasmabehandlung verbessert.
    Additional Material: 12 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/actp.1983.010340311
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  • 9
    Electronic Resource
    Electronic Resource
    XPS-Untersuchungen von im H2-Plasma erzeugten Polyenen in PVC (1990)
    Weinheim : Wiley-Blackwell
    Acta Polymerica 41 (1990), S. 553-554 
    Details
    ISSN: 0323-7648
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/actp.1990.010411011
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  • 10
    Electronic Resource
    Electronic Resource
    Topokinetics of the polyene formation in PVC films during treatment with non-oxidative plasma (1991)
    Weinheim : Wiley-Blackwell
    Acta Polymerica 42 (1991), S. 51-52 
    Details
    ISSN: 0323-7648
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/actp.1991.010420117
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