Library

X
feed icon rss

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
Filter
  • Articles: DFG German National Licenses  (29)
  • 1980-1984  (22)
  • 1935-1939  (7)
  • 11
    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
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 12
    Electronic Resource
    Electronic Resource
    On commuting unbounded self-adjoint operators II (1984)
    Springer
    Integral equations and operator theory 7 (1984), S. 815-867 
    Details
    ISSN: 1420-8989
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Notes: Abstract We study pairs of unbounded self-adjoint operators which commute on a common core.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01195869
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 13
    Electronic Resource
    Electronic Resource
    Malignant giant cell tumor of the breast associated with infiltrating duct carcinoma (1981)
    Springer
    Virchows Archiv 393 (1981), S. 359-364 
    Details
    ISSN: 1432-2307
    Keywords: Giant cell tumor ; Osteoclastoma ; Breast carcinoma ; Giant cells
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary We present a case of a 59 year old female with a giant cell tumor (osteoclastoma) of the breast metastasizing to the lungs, the pleura, the thyroid gland and the myocardium. An infiltrating duct carcinoma was found at the margin of this breast tumor, but was absent from the metastases. The gross and microscopic features of the lesions are described and the literature is briefly reviewed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00430836
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 14
    Electronic Resource
    Electronic Resource
    Nonlinear processes II (1982)
    Springer
    Applied physics 28 (1982), S. 262-268 
    Details
    ISSN: 1432-0649
    Keywords: 78 ; 42.65 ; 61.40 ; 73 ; 73.20 ; 82 ; 81.15
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00697854
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 15
    Electronic Resource
    Electronic Resource
    Expression of aromatic polycyclic hydrocarbon-induced monooxygenase (aryl hydrocarbon hydroxylase) in man x mouse hybrids is associated with human chromosome 2 (1981)
    Springer
    Human genetics 〈Berlin〉 59 (1981), S. 277-280 
    Details
    ISSN: 1432-1203
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Polycyclic aromatic hydrocarbon-inducible monooxygenase directed toward the substrate benzo(a)pyrene, i.e., “aryl hydrocarbon hydroxylase”, was monitored in cell hybrids formed from mouse RAG cells and several human fibroblasts lines. In RAG cells no aryl hydrocarbon hydroxylase activity was detectable; however, these cells exhibited relatively high levels of NADPH cytochrome C (P-450) reductase (EC. 1.6.2.4). In 12 hybrids lines, induced aryl hydrocarbon hydroxylase segregated with human chromosome 2. The results indicate that the structural gene of the polycyclic aromatic hydrocarbon-inducible monooxygenase or gene(s) involved in the induction of the enzyme is located on human chromosome 2.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00295458
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 16
    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
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 17
    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
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 18
    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
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 19
    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
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 20
    Electronic Resource
    Electronic Resource
    Tricarbonylchromium-complexed phenylsiloxane polymers as stereoselective hydrogenation catalysts: Preparation and properties (1980)
    New York : Wiley-Blackwell
    Journal of Polymer Science: Polymer Chemistry Edition 18 (1980), S. 2663-2676 
    Details
    ISSN: 0360-6376
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Soluble tricarbonylchromium complexes were made by reacting Cr(CO)6 with a ladder polyphenylsilsesquioxane and a linear polydiphenylsiloxane. These new polymer Cr(CO)3 complexes were characterized by elemental Cr, infrared (IR), gel permeation chromatography (GPC), viscosity, and thermal analyses and were evaluated as stereoselective hydrogenation catalysts. Thermogravimetry studies demonstrated that the new complexes were more stable at 180-200°C in N2 than the corresponding complex from crosslinked polystyrene. These silicone polymer complexes catalyzed stereoselective hydrogenation of methyl sorbate to cis-3-hexenoate in cyclohexane and tetrahydrofuran (THF) and could be recovered from THF for recycling by precipitation-fiItration. Catalytic activity and recyclability, however, were highly influenced by the solvent. Loss of catalytic activity associated with loss of Cr(CO)3 was observed on recycling. These results support a mechanisim that involves dissociation of Cr(CO)3, a significant portion of which cannot become reassociated with the polymer phenyl groups.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1980.170180824
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...