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  • Artikel  (100)
  • Springer  (100)
  • Public Library of Science (PLoS)
  • Chemie und Pharmazie  (98)
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  • Artikel  (100)
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  • 1
    Digitale Medien
    Digitale Medien
    Preparation of a human lung purified plasma membrane fraction: Confirmation by enzyme markers, electron microscopy, and histamine H1 receptor binding (1984)
    Springer
    The journal of membrane biology 79 (1984), S. 33-39 
    Details
    ISSN: 1432-1424
    Schlagwort(e): plasma membrane ; lung ; histamine receptors ; 5′ nucleotidase
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Chemie und Pharmazie
    Notizen: Summary A simple and rapid method of isolating plasma membranes from human peripheral lung tissue is described. The method involves homogenization of tissue in 0.25m sucrose-buffered medium followed by differential and sucrose density gradient centrifugation. Enzymatic and morphological characterization of the plasma membrane fraction revealed minimal contamination by nonplasma membrane fragments. The isolated plasma membranes showed an 18-fold purification of 5′-nucleotidase activity compared to the original homogenate. Electronmicroscopic studies of the plasma membrane fraction revealed the presence of small membrane vesicles having a trilaminar membrane structure. To further examine the purity of the plasma membrane preparation, the binding of the H1 receptor antagonist,3H pyrilamine, to the plasma membrane-enriched fraction was compared to the binding to crude membrane preparations. Both the plasma membrane-enriched fraction and the crude membrane preparation had similar Kd's for the histamine antagonist, but the plasma membrane-enriched fraction had a threefold greater binding capacity, reflecting the relative enrichment of plasma membranes of the preparation. Thus, a method has been developed for the isolation of plasma membranes from human peripheral lung which should provide material for a variety of biochemical and pharmacological studies.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01868524
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  • 2
    Digitale Medien
    Digitale Medien
    Komplexe Zusammenhänge zwischen Eigenschaften und Strukturparametern von Elektrodengläsern (1995)
    Springer
    Monatshefte für Chemie 126 (1995), S. 839-850 
    Details
    ISSN: 1434-4475
    Schlagwort(e): Electrode glasses ; Principal Component Analysis ; Cluster analysis
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie
    Notizen: Summary Cluster Analysis has been shown to be partially suitable for the classification of glasses. The expansion of the clusters on theSeger's diagram allows an investigation of the influence of the different glass components. Variation of the SiO2 content results in a smaller change of properties than variation of the Na2O/RO relationship. Principal Component Analysis is convenient for showing correlations between the composition of the examined glasses, the glass structure parameters, and the different electrode properties. Properties of electrodes are mostly influenced by the content of Na2O and by the kind of the divalent cations. In contrast thereto structure parameters become basically determined by the content of SiO2 and RO. The field strength of the divalent cations plays the decisive roll again.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00811003
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  • 3
    Digitale Medien
    Digitale Medien
    Characterization of chemically modified silica by infrared and solid state nuclear magnetic resonance spectroscopy (1997)
    Springer
    Fresenius' journal of analytical chemistry 358 (1997), S. 240-241 
    Details
    ISSN: 1432-1130
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie
    Notizen: Abstract Silica modified with benzene was investigated by infrared and solid state 13C cross-polarization magic angle spinning nuclear magnetic resonance spectroscopy (13C CP MAS NMR). Whereas infrared spectroscopy did not allow to distinguish between phenyl and polyphenyl groups, this was possible by solid state nuclear magnetic resonance spectroscopy.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/s002160050394
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  • 4
    Digitale Medien
    Digitale Medien
    29Si NMR investigations on oligosilane dendrimers (1997)
    Springer
    Fresenius' journal of analytical chemistry 357 (1997), S. 503-504 
    Details
    ISSN: 1432-1130
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie
    Notizen: Abstract Starting with the high functionalized trisilane SiClMe(SiCl2Me)2 and tetrasilane SiMe(SiCl2Me)3 several octa- and decasilane dendrimers containing directly neighboured branchings were prepared. In these compounds the 29Si NMR chemical shifts of the different silyl groups are shifted towards lower field compared with those of analogous groups in tetra- or hexasilanes. This observation is a helpful tool for the characterization of further dendritic oligomers by 29Si NMR.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/s002160050201
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  • 5
    Digitale Medien
    Digitale Medien
    15N CP/MAS NMR as an instrument in structure investigations of organosilicon polymers (1999)
    Springer
    Fresenius' journal of analytical chemistry 363 (1999), S. 185-188 
    Details
    ISSN: 1432-1130
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie
    Notizen: Abstract 15N solid state NMR without enrichment is rarely used because of the low sensitivity and low natural abundance of this nucleus. As demonstrated on different nitrogen-containing polysilanes and polysilazanes, it can be shown that with the CP/MAS technique spectra can be obtained in good quality and within acceptable measuring time. Three main different nitrogen sites – NSi3, NSi2H and NSiH2– can be observed as well as changes in the intensities of these sites with reaction and tempering conditions. Thus the spectra give valuable additional information for a better understanding of the structures and their changes within the investigated systems.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/s002160051168
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  • 6
    Digitale Medien
    Digitale Medien
    Angle-resolved thermal desorption of atoms from solid surfaces: one-phonon mechanism (1987)
    Springer
    Theoretical chemistry accounts 72 (1987), S. 475-484 
    Details
    ISSN: 1432-2234
    Schlagwort(e): Desorption ; Phonons ; Thermal
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie
    Notizen: Abstract A model for one-phonon thermal desorption is presented in which the structure of the substrate phonons, expressed as a projection on a surface atom of the phonon density of states, appears as a separate factor in the angle- and energy-resolved desorption rate. Desorption from both localized, and delocalized initioladatom states is considered. Under certain circumstances one can obtain the cosine-distribution of the equilibrium theory, but in general, the desorption flux from delocalized states deviates from the cosine law by being peaked away from the surface normal, whereas for localized initiol states, the flux is concentrated more in the normal direction.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01192236
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  • 7
    Digitale Medien
    Digitale Medien
    The conductivity of aqueous zinc chloride solutions (1982)
    Springer
    Journal of applied electrochemistry 12 (1982), S. 1-5 
    Details
    ISSN: 1572-8838
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie , Elektrotechnik, Elektronik, Nachrichtentechnik
    Notizen: Abstract The conductivity of aqueous zinc chloride reaches a maximum of 10.7 Ω−1 m−1 at 3.7 M ZnCl2. Measurements on chlorinated ZnCl2 showed that at low chlorine concentrations, the conductivity increased linearly with the square root of the chlorine concentration. The increase was due to the three species: dissolved chlorine, Cl 3 − and HClO. Ammonium chloride additions increased the conductivity of aqueous zinc chloride substantially.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01112058
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  • 8
    Digitale Medien
    Digitale Medien
    The effect of additives on the morphology of zinc electrodeposited from a zinc chloride electrolyte at high current densities (1981)
    Springer
    Journal of applied electrochemistry 11 (1981), S. 677-683 
    Details
    ISSN: 1572-8838
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie , Elektrotechnik, Elektronik, Nachrichtentechnik
    Notizen: Abstract There are advantages if zinc can be deposited electrochemically at high current densities. In order to improve the deposit at current densities exceeding 2000 Am−2, various additions were made to the electrolyte. It was found that proteinous additives produced planar deposits with a (10.2) (10.3) orientation and a current efficiency of around 85% in a small laboratory cell.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00615170
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  • 9
    Digitale Medien
    Digitale Medien
    Ethical Guidelines for a Networked World under Construction (1998)
    Springer
    Journal of business ethics 17 (1998), S. 1057-1071 
    Details
    ISSN: 1573-0697
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Philosophie , Wirtschaftswissenschaften
    Notizen: Abstract Networked computer systems simultaneously destroy and build up old and new kinds of global and local jobs. Digitally networked ultra-modern structures in work, company and administration bring us turbulent times. This development is analyzed from an ethical, technological and economical point of view and illustrated by empirical data. The main emphasis of this article is placed on considerations, from the point of view of business ethics, of the conception of workplaces – in the office, at home and abroad (mobile work) – equipped for computer-supported information exchange. In order to make better use of these new technologies, ethical, action-oriented guidelines should be considered.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1023/A:1006019432444
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  • 10
    Digitale Medien
    Digitale Medien
    A High-Performance Liquid Chromatographic Microassay Employing a Liquid–Solid Extraction Technique for Etintidine in Plasma (1987)
    Springer
    Pharmaceutical research 4 (1987), S. 133-136 
    Details
    ISSN: 1573-904X
    Schlagwort(e): etintidine ; high-performance liquid chromatography (HPLC) ; solid extraction ; determination of etintidine in plasma
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie
    Notizen: Abstract This paper describes a new, rapid solid extraction method for the determination of etintidine in plasma. The method employs a semiautomatic sample preparation system. Plasma samples and the internal standard (cimetidine) were applied onto octyl-bonded silica extraction columns. The extraction columns were then subjected to Tris buffer and water wash and were subsequently loaded onto an automatic sample injection system. The contents of the extraction columns were eluted on-line with a mobile phase of acetonitrile:methanol:0.1% ammonium hydroxide (85:10:5, by volume) onto a silica analytical column and detected by UV absorption at 229 nm. The chromatographic condition separates etintidine from some of its metabolites and other endogenous components in plasma. The detection limit for etintidine was 0.02–0.05 µg/ml when 0.2 ml of plasma was used. This method has been used for the determination of plasma etintidine levels in humans and mice after oral administration of etintidine and was found to be suitable for pharmacokinetic/bioavailability studies of etintidine in humans and animals. The method can also be used for the quantitative determination of cimetidine and certain metabolites of etintidine.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1023/A:1016419019715
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