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  • 1
    Electronic Resource
    Electronic Resource
    Preferential adsorption of swollen polydimethylsiloxane (PDMS) networks and of linear PDMS in 2-butanone/cyclohexane (1986)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 187 (1986), S. 163-175 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Measurements of preferential adsorption, λ(ν), by differential refractometry, and of swelling equilibrium, ν3-, of polydimethylsiloxane (PDMS) networks were carried out in the solvent mixture ethyl methyl ketone (MEK) + cyclohexane (Ch), at 25°C. The preferential adsorption and the total sorption were also determined, by light scattering, for linear PDMS in the same mixed solvent. The behaviour of the system crosslinked PDMS/MEK + Ch is compared with that of the system linear PDMS (dilute solution)/MEK + Ch. The experimental values of ν3 and λ are compared with those predicted by thermodynamic theory. For this comparison, new thermodynamic equations, to calculate preferential and total sorption at finite polymer concentration, are derived using the extended Flory-Huggins model. The derived equations take into account the solvent composition dependence of interaction parameters, neglected (as an approximation) in previous works.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1986.021870116
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  • 2
    Electronic Resource
    Electronic Resource
    Density and thermal expansion of a trifluoropropylsiloxane polymer in solution (1988)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 35 (1988), S. 273-275 
    Details
    ISSN: 0021-8995
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1988.070350120
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  • 3
    Electronic Resource
    Electronic Resource
    Optically active analogues of ebastine: Synthesis and effect of chirality on their antihistaminic and antimuscarinic activity (1994)
    New York, NY [u.a.] : Wiley-Blackwell
    Chirality 6 (1994), S. 631-641 
    Details
    ISSN: 0899-0042
    Keywords: benztropine ; histamine ; H1-receptors ; molecular modelling ; 4-methyl-diphenhydramine ; stereoselectivity ; synthesis ; Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: A series of optically active analogues of the H1-antihistamine ebastine, with chiral center(s) at the benzhydryl and/or phenylbutyl part of the molecule, have been synthesized. Their in vitro antihistaminic and antimuscarinic activities were investigated, along with a molecular modelling study. It was found that introduction of the benzhydryl chiral center yielded significant stereoselectivity for both antihistaminic and antimuscarinic activities. The steric preferences of the benzhydryl chiral center for antihistaminic and antimuscarinic actions were mirror images of each other. The (-)-isomer of 4-methylebastine (6d) showed more than 10-fold higher in vitro antihistaminic potency than ebastine. Meanwhile the selectivity of 6d for histamine H1-receptors was also increased by more than 20 times in comparison with ebastine. The chirality at the phenylbutyl part of the molecule does not significantly alter the antihistaminic or antimuscarinic activity of the compounds although the (S)-isomers showed slightly but unanimously higher antihistaminic activity than the (R)-isomers. These results have been discussed with existing stereoselectivity data of antihistamines and an asymmetric pharmacophore model for H1-antagonists has been described. © 1994 Wiley-Liss, Inc.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/chir.530060806
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  • 4
    Electronic Resource
    Electronic Resource
    Influence of hydrodynamic conditions on naphthalene dissolution and subsequent biodegradation (1998)
    New York, NY [u.a.] : Wiley-Blackwell
    Biotechnology and Bioengineering 57 (1998), S. 145-154 
    Details
    ISSN: 0006-3592
    Keywords: bioavailability ; PAH ; biodegradation ; dissolution ; hydrodynamic ; mixing ; Chemistry ; Biochemistry and Biotechnology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: The influence of hydrodynamic conditions on the dissolution rate of crystalline naphthalene as a model polycyclic aromatic hydrocarbon (PAH) was studied in stirred batch reactors with varying impeller speeds. Mass transfer from naphthalene melts of different surface areas to the aqueous phase was measured and results were modeled according to the film theory. Results were generalized using dimensionless numbers (Reynolds, Schmidt, and Sherwood). In combined mass transfer and biodegradation experiments, the effect of hydrodynamic conditions on the degradation rate of naphthalene by Pseudomonas 8909N was studied. Experimental results were mathematically described using mass-transfer and microbiological models. The experiments allowed determination of mass-transfer and microbiological parameters separately in a single run. The biomass formation rate under mass transfer limited conditions, which is related to the naphthalene biodegradation rate, was correlated to the dimensionless Reynolds number, indicating increased bioavailability at increased mixing in the reactor liquid. The methodology presented in which mass transfer processes are quantified under sterile conditions followed by a biodegradation experiment can also be adapted to more complex and realistic systems, such as particulate, suspended PAH solids or soils with intrapartically sorbed contaminants when the appropriate mass-transfer equations are incorporated. © 1998 John Wiley & Sons, Inc. Biotechnol Bioeng 57: 145-154, 1998.
    Additional Material: 10 Ill.
    Type of Medium: Electronic Resource
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    Paper (German National Licenses)
  • 5
    Electronic Resource
    Electronic Resource
    Partial specific volume and thermal expansion coefficient of poly(N-vinylimidazole) (1995)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 58 (1995), S. 1943-1946 
    Details
    ISSN: 0021-8995
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: The density of poly(N-vinylimidazole) dilute solutions in methanol, triethylene glycol, dimethyl sulfoxide, and N,N-dimethylformamide as well as in an aqueous neutral (with and without ionic strength) and acid solution have been measured at several temperatures. The specific volume of the polymer in bulk has been determined experimentally and theoretically, following the group aditivity method, and both values were coincident. Partial specific volume and thermal expansion coefficient were found to be solvent-dependent. These results were interpreted in terms of the different types of solvation or the interaction of polymer-solvent. © 1995 John Wiley & Sons, Inc.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1995.070581103
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  • 6
    Electronic Resource
    Electronic Resource
    Effect of nonionic surfactants on naphthalene dissolution and biodegradation (1998)
    New York, NY [u.a.] : Wiley-Blackwell
    Biotechnology and Bioengineering 60 (1998), S. 397-407 
    Details
    ISSN: 0006-3592
    Keywords: nonionic surfactants ; mass transfer ; bioavailability ; PAH ; biodegradation ; Chemistry ; Biochemistry and Biotechnology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: The effect of six nonionic surfactants, Igepal CA-720, Tergitol NPX, Triton X-100, PLE4, PLE10, and PLE23, on the dissolution rate of solid naphthalene was studied in stirred batch reactors. Results showed increased mass-transfer rates with increased surfactant concentrations up to 10 kg m-3. Dissolution experiments were adequatly described by a mechanistic mass-transfer model. Partitioning of naphthalene into the micelles and the diffusion coefficients of the micelles affected the dissolution rate most significantly. Combined dissolution and biodegradation experiments with Triton X-100 or PLE10 with naphthalene showed that the biomass-formation rate of Pseudomonas 8909N (DSM No. 11634) increased concomitantly with the mass-transfer rate under naphthalene-dissolution limited conditions up to surfactant concentrations of 6 kg m-3. © 1998 John Wiley & Sons, Inc. Biotechnol Bioeng 60: 397-407, 1998.
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
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    Paper (German National Licenses)
  • 7
    Electronic Resource
    Electronic Resource
    Extrem kurze nichtbindende Sauerstoff-Sauerstoff-Abstände: Die Kristallstrukturen von NbBO4, NaNb3O8 und NaTa3O8Professor Heinrich Nöth zum 60. Geburtstag gewidmetDiese Arbeit wurde durch den Fonds der Chemischen Industrie gefördert. K.-J. R. dankt der University of Pretoria für finanzielle Unterstützung. Herrn Dr. U. Klement danken wir für die Sammlung der Diffraktometerdaten. (1988)
    Weinheim : Wiley-Blackwell
    Zeitschrift für die chemische Industrie 100 (1988), S. 973-975 
    Details
    ISSN: 0044-8249
    Keywords: Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/ange.19881000721
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  • 8
    Electronic Resource
    Electronic Resource
    Extremely Short Non-Bonding Oxygen—Oxygen Distances: The Crystal Structures of NbBO4, NaNb3O8, and NaTa3O8This work was supported by the Fonds der Chemischen Industrie. K.-J. R. thanks the University of Pretoria for financial support. We thank Dr. U. Klement for the collection of diffraction data.Dedicated to Professor Heinrich Nöth on the occasion of his 60th birthday (1988)
    Weinheim : Wiley-Blackwell
    Angewandte Chemie International Edition in English 27 (1988), S. 969-971 
    Details
    ISSN: 0570-0833
    Keywords: Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/anie.198809691
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  • 9
    Electronic Resource
    Electronic Resource
    Raman and infrared study of neodymium oxide peroxide, Nd2O2(O2) (1994)
    Chichester [u.a.] : Wiley-Blackwell
    Journal of Raman Spectroscopy 25 (1994), S. 855-859 
    Details
    ISSN: 0377-0486
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Nd2O2(O2) has been formed at very high oxygen pressures in an unsuccessful attempt to prepare neodymium(IV) dioxide, Nd4+ O2, and contains oxide (O2-) and peroxide (O22-) ions. The structure of Nd2O2(O2) closely resembles that of CaF2 and its full vibrational spectra could be interpreted in terms of this structure. Although Nd2O2(O2) has a monclinic structure, its vibrational spectra are not in agreement with the monoclinic B-type phase of the lanthanide(III) sesquioxides, and it is shown why this is so. Many of the Nd—O vibrational modes in Nd2O2(O2) agree, however, with those observed in the trigonal A-type Nd2O3, and the ν (O—O) stretching and Nd—O—O bending modes could be clearly identified.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jrs.1250251103
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  • 10
    Electronic Resource
    Electronic Resource
    KSbF6 revisitedThis paper is dedicated to Professor D. A. Long on the occasion of his 70th birthday.. I - A Raman and infrared study of the tetragonal phase I (1995)
    Chichester [u.a.] : Wiley-Blackwell
    Journal of Raman Spectroscopy 26 (1995), S. 847-854 
    Details
    ISSN: 0377-0486
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The polarized Raman spectra of single crystals of KSbF6-I of P42m-D2d1 symmetry are reported. The predicted LO-TO splittings of the B2 and E modes were not observed and the vibrational spectra do not indicate a non-centrosymmetric structure. The calculated relative intensities of the Raman bands in the single-crystal spectra agree very well with the observed values. It is shown that the anions execute fourfold reorientational motions around the S4 axis of the crystals and an activation energy of 3.2 kcal mol-1 (13.4 kJ mol-1) is calculated from the variation of the linewidths of Raman bands with temperature. The barrier is penetrated by the anions and because of the jumping motions of the anions in KSbF6-I the small distortions from a centrosymmetric structure are averaged out and the Raman and infrared spectra appear to be mutually exclusive.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jrs.1250260835
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