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  • 1
    Digitale Medien
    Digitale Medien
    Holographic grating relaxation studies of camphorquinone diffusion in a polystyrene host (1986)
    s.l. : American Chemical Society
    The @journal of physical chemistry 〈Washington, DC〉 90 (1986), S. 1299-1301 
    Details
    Quelle: ACS Legacy Archives
    Thema: Chemie und Pharmazie , Physik
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1021/j100398a019
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  • 2
    Digitale Medien
    Digitale Medien
    Ca2+-binding activity of protein isolated from sarcotubular membranes (1971)
    s.l. : American Chemical Society
    Biochemistry 10 (1971), S. 3679-3685 
    Details
    ISSN: 1520-4995
    Quelle: ACS Legacy Archives
    Thema: Biologie , Chemie und Pharmazie
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1021/bi00796a007
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  • 3
    Digitale Medien
    Digitale Medien
    Variational-Perturbation theory in the LCAO-MO method for closed-shell molecules (1982)
    New York, NY : Wiley-Blackwell
    International Journal of Quantum Chemistry 21 (1982), S. 399-410 
    Details
    ISSN: 0020-7608
    Schlagwort(e): Computational Chemistry and Molecular Modeling ; Atomic, Molecular and Optical Physics
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: Using the variational principle, equations have been obtained for density matrix of molecules with the external perturbation of the common type present. The perturbed wave function was taken as a superposition of the ground and single-excited configurations made of the Hartree-Fock molecular spin orbitals. On the basis of these equations a series of variants of static perturbation theory have been worked out for the ground and excited states of closed-shell molecules.
    Zusätzliches Material: 2 Tab.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/qua.560210205
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  • 4
    Digitale Medien
    Digitale Medien
    The effect of the nature of organoaluminium compound and the catalytic system preparation procedure on molecular characteristics of 1,4-Cis-polybutadiene (1994)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part A: Polymer Chemistry 32 (1994), S. 1237-1242 
    Details
    ISSN: 0887-624X
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: This study investigated the effect produced by the preparation procedure of a 2-component lanthanide catalytic system and by the nature of organoaluminium compound on 1) the molecular characteristics of 1,4-cis-polybutadiene (PB), 2) the regularities of its average molecular weight (MW), and 3) molecular weight distribution (MWD). The kinetic parameters of the polymerization process were calculated. The principal regularities of variations in PB molecular characteristics with respect to the polymerization conditions, i.e., OAC and monomer concentrations and temperature, are retained with different procedures of the lanthanide catalytic system, and those present distinctive features of the catalytic complexes studied in this article. But as for differences in MW and its patterns of dependence on monomer conversion rate and OAC nature, these are due to changes in kinetic parameters of the polymerization, which occur with the use of the catalyst prepared by a different procedure. © 1994 John Wiley & Sons, Inc.
    Zusätzliches Material: 6 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/pola.1994.080320704
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  • 5
    Digitale Medien
    Digitale Medien
    The mechanism of butadiene polymerization with the catalytic system NdCl3 · 3TBP—(1C4H9)2AIH (1993)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part A: Polymer Chemistry 31 (1993), S. 2419-2421 
    Details
    ISSN: 0887-624X
    Schlagwort(e): polymerization ; dienes ; catalyst ; lanthanides ; mechanism ; microstructures ; Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: The polymerization of butadiene with the catalytic system NdCl3 · 3TBP-(1C4H9)2AlH (TBP-tributyl phosphate) was studied. With regard to the anti-syn-isomerization of both free- and monomer-complexed active centers, the kinetic scheme of the propagation reaction was shown to afford adequate descriptions of the experimental dependence of the polymer microstructure on the monomer concentration. Following the results of the quantum-chemical calculations, it was assumed that the free molecules (1C4H9)2AlH coordinated competitively with the monomer molecules on the active centers in solution, which finally led to lower reactivity of the active centers. © 1993 John Wiley & Sons, Inc.
    Zusätzliches Material: 3 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/pola.1993.080311001
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  • 6
    Digitale Medien
    Digitale Medien
    Urea sensor with single poly(propylene) membrane (1992)
    New York, NY [u.a.] : Wiley-Blackwell
    Biotechnology and Bioengineering 40 (1992), S. 446-449 
    Details
    ISSN: 0006-3592
    Schlagwort(e): urea sensor ; plasma reaction ; poly(propylene) membrane ; Chemistry ; Biochemistry and Biotechnology
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Biologie , Werkstoffwissenschaften, Fertigungsverfahren, Fertigung
    Notizen: Urease was immobilized on the plasma-aminated surface of a hyfrophobic poly(propylene) (PP) membrane. This membrane, with urease matrix on one side while maintaining its original hydrophobic property on the other, was used to construct the urea sensor. The new urea sensors had response sensitivities ranged from 19 mV/decade to 30 mV/decade depending on the conditions of the plasma reaction. The enzyme electrode using single membrane gave a shorter response time as compared to the corresponding conventional electrode employing two seperate PP membranes. The sensitivity of the enzyme electrode increased with increasing buffer pH and reached a maximal level (40 mV/decade) at pH 7.6. The response sensitivity of the electrode was not affected by the change of buffer strength. Deamination of the plasma-modified hydrophobic PP membrane did not occur in aqueous environment judging from the stability of the urea electrode up to 12 days of operation. © 1992 John Wiley & Sons. Inc.
    Zusätzliches Material: 4 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/bit.260400315
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  • 7
    Digitale Medien
    Digitale Medien
    Mutual diffusion in aqueous gel solutions (1994)
    New York, NY [u.a.] : Wiley-Blackwell
    Polymer International 33 (1994), S. 359-365 
    Details
    ISSN: 0959-8103
    Schlagwort(e): gelatin ; polyelectrolyte ; diffusion ; interferometry ; Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie , Maschinenbau , Physik
    Notizen: Concentration relations for mutual diffusion coefficients Dm(C) in water of polyelectrolyte gelatin macromolecules at different temperatures were studied by optical interferometry. It is shown that Dm(C) values are in agreement with scaling predictions and are similar to those observed for solutions of neutral macromolecules under θ-conditions. However, they are greatly influenced by the square-law term C2, having a correlation to the conventional scaling law Dm ∝ C, and the mobility of solution components is influenced by physical gelation processes under certain thermodynamic conditions. It is demonstrated that the temperature relation of the diffusion coefficient at infinite dilution D0(C → 0) for the three gelating samples with various physico-chemical properties can be described by a universal function.
    Zusätzliches Material: 9 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/pi.1994.210330403
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  • 8
    Digitale Medien
    Digitale Medien
    Lipid components of sarcotubular membranesPresented in part at the 62nd Annual Meeting of the American Society of Biological Chemists at San Francisco, California, June 17, 1971. (1972)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Cellular Physiology 79 (1972), S. 97-101 
    Details
    ISSN: 0021-9541
    Schlagwort(e): Life and Medical Sciences ; Cell & Developmental Biology
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Biologie , Medizin
    Notizen: The lipid composition of a highly purified preparation of rat skeletal muscle sarcoplasmic reticulum was studied. These membranes contain per mg of protein 0.50 ± 0.02 μmoles of phosphatidylcholine, 0.13 ± 0.02 μmoles of phosphatidylethanolamine and 0.07 ± 0.02 μmoles ofphosphatidylinositol. These three components account for 97.3% of total lipid phosphorus. Unlike other mammalian membranes so far studied, this preparation contains neither sphingomyelin nor phosphatidylserine. Neural lipids were also measured and it is concluded that neither cholesterol nor other neutral lipids are components of the membranes studied. The results of this study indicate therefore that the lipid profile of sarcotubular membranes is relatively simple compared with most other membranes.
    Zusätzliches Material: 2 Tab.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/jcp.1040790111
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  • 9
    Digitale Medien
    Digitale Medien
    On the separation of C4-hydrocarbon mixtures by oligomerization and polymerization. Part I: Proton acid complexes as initiators for isobutene oligomerization (1984)
    Weinheim : Wiley-Blackwell
    Acta Polymerica 35 (1984), S. 677-680 
    Details
    ISSN: 0323-7648
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie , Physik
    Beschreibung / Inhaltsverzeichnis: BRÖNSTED-Säure-Metallsulfat- und BRÖNSTED-Säure-LEWIS-Säure-Komplexe sind geeignete Initiatoren zur Isobutenoligomerisation aus C4-Kohlenwasserstoffgemischen. Die Selektivität der Umsetzung hängt vom Säuregehalt der Komplexe, von der LEWIS-Säure und von der Oligomerisationstemperatur ab. Durch steigende Anteile an Butadien im C4-Schnitt wird die Oligomerisation verlangsamt und schließlich inhibiert.
    Notizen: BRÖNSTED acid-metal sulfate and BRÖNSTED acid-LEWIS acid complexes are useful initiators for the oligomerization of isobutene out of C4-hydrocarbon mixtures. The selectivity of conversion depends on the BRÖNSTED acid content of the complexes, the LEWIS acid and the temperature of oligomerization. The oligomerization is retarded and finally inhibited by increasing amounts of butadiene in the C4-mixture.
    Zusätzliches Material: 2 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/actp.1984.010351103
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  • 10
    Digitale Medien
    Digitale Medien
    The effect of the radical structure in trialkylaluminums on cis polymerization of dienes on titanium catalyst systems (1983)
    New York : Wiley-Blackwell
    Journal of Polymer Science: Polymer Chemistry Edition 21 (1983), S. 2697-2711 
    Details
    ISSN: 0360-6376
    Schlagwort(e): Physics ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: 1,4-cis-polymerizations of 1,3-dienes of TiCl4-AIR3 catalyst systems for isoprene and on TiI2Cl2-AIR3 caltalyst systems for butadiene have been investigated. AIR3 denotes herein an organoaluminum compound (OAC) containing hydrocarbon radicals, linear of different lengths or cyclic, both saturated and unsaturated, as well as those containing O, N, or Si atoms. Neither the OAC radical structure nor the Al/Ti ratios in the range investigated have been found to influence the stereospecificities and reactivities (chain propagation constant) of the active centers. Differing activities of the catalyst systems have been established to result from the variations in the concentrations of the active centers involving 〈1-5% of all the Ti species. The nature of the OAC radical does not change the mode of the molecular weight distribution in the polymers obtained. An increase in the molecular weight (MW) of the polydienes produced with the use of higher-MW trialkylaluminums was provoked by an increase in the macromolecules propagation period owing to the lower constant of chain transfer to the higher-MW OAC.
    Zusätzliches Material: 13 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/pol.1983.170210908
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