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  • 1
    Electronic Resource
    Electronic Resource
    Simple, analytical criteria for the sequencing of distillation columns (1985)
    Hoboken, NJ : Wiley-Blackwell
    AIChE Journal 31 (1985), S. 683-689 
    Details
    ISSN: 0001-1541
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: A quantitative criterion for the selection of simple distillation sequences is derived for ideal mixtures. A simple cost model, along with a short-cut solution of Underwood's equations, gives an analytical form for the total vapor rate, which is the key design variable. The results for column sequencing that are based on the analytical criterion agree well with more exact solutions, but they indicate that in numerous situations the commonly accepted heuristics are incorrect.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/aic.690310419
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  • 2
    Electronic Resource
    Electronic Resource
    Theoretical models for γ-Al2O3 (110) surface hydroxylation: An ab initio embedded cluster study (1998)
    New York, NY : Wiley-Blackwell
    International Journal of Quantum Chemistry 70 (1998), S. 359-365 
    Details
    ISSN: 0020-7608
    Keywords: Chemistry ; Theoretical, Physical and Computational Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: A theoretical analysis of γ-Al2O3 (110) surface hydroxylation based on ab initio Hartree-Fock embedded cluster calculations was carried out. Both tetrahedral and octahedral Al sites were considered. These sites were modeled by a series of clusters of increasing size: Al8O3, Al12O5, and Al16O8, embedded in an array of point charges. The adsorption of water was found to be dissociative or nondissociative depending on the cluster size, although the mechanism clearly converges toward dissociation for the more reliable models in agreement with the experiment. This dependence can be explained in light of the basicity modification of surface oxide ions induced by the environment as well as by surface relaxation. Comparison of chemisorption energies suggests that the preferred site for hydroxylation is a low coordination tetrahedral aluminum.   © 1998 John Wiley & Sons, Inc. Int J Quant Chem 70: 359-365, 1998
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Purification of S1 nuclease from Aspergillus oryzae by recycling isoelectric focusing (1990)
    Weinheim : Wiley-Blackwell
    Electrophoresis 11 (1990), S. 953-957 
    Details
    ISSN: 0173-0835
    Keywords: Chemistry ; Biochemistry and Biotechnology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: We describe the purification of a single-strand nuclease from Aspergillus oryzae using the first commercial prototype of an instrument (RF3TM) designed by Milan Bier et al. for preparative-scale insoelectric focusing. Protein separation takes place entirely in solution, with shear-stabilized laminar flow counteracting convective disturbances generated by the electric field. Conditions for isoelectric focusing were determined by focusing fractions with nuclease activity, following chromatography on DEAE-Sepharose, in analytical gels containing carrier ampholytes. The separation was then scaled up to process larger quantities of protein in the RF3. When partially-purified protein (250 mg, 6700 U/mg) was focused in pH 3-4 carrier ampholytes, 67% of the activity was recovered in pooled peak fractions with a specific activity of 54 000 U/mg protein. Overall, 82% of the activity loaded on the RF3 was recovered. Eliminating two steps prior to isoelectric focusing, and increasing the protein load from 250 mg to 1.2 g, produced an enzyme with a nearly four-fold increase in specific activity (from 4000 U/mg protein to 15 000 U/mg protein) but with unacceptable color. Our results indicate that a high quality enzyme can be prepared in quantity when heat denaturation and ammonium sulfate precipitation are included prior to isoelectric focusing.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/elps.1150111113
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  • 4
    Electronic Resource
    Electronic Resource
    Spectroscopic studies of surface copper spinels. Influence of pretreatments on chemical state of copper (1993)
    Chichester [u.a.] : Wiley-Blackwell
    Surface and Interface Analysis 20 (1993), S. 1067-1074 
    Details
    ISSN: 0142-2421
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Notes: The nature of copper species of a series of alumina-supported copper samples was investigated by the kinetics of reduction, x-ray photoelectron spectroscopy, temperature-programmed desorption-mass spectrometry of chemisorbed NO and infrared spectroscopy of chemisorbed NO and CO probes. The role of these copper species was also examined in the catalytic decomposition of NO. The surface properties of copper were found to depend strongly on both Cu loading and calcination treatment. At Cu contents as low as 0.6 wt.%, Cu2+ ions from a well-dispersed interacting phase at the alumina surface, which upon calcination forms a surface spinel CuAl2O4. At copper contents up to 3.2 wt.%, both the surface spinel CuAl2O4 and a segregated CuO phase were clearly distinguished. The partial reduction of these species upon thermal treatment under high vacuum, the ability of the surface sites to chemisorb NO and CO probes and their implications in the catalytic decomposition of NO are discussed.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/sia.740201307
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  • 5
    Electronic Resource
    Electronic Resource
    Importance of Madelung potential in quantum chemical modeling of ionic surfaces (1997)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Computational Chemistry 18 (1997), S. 617-628 
    Details
    ISSN: 0192-8651
    Keywords: Chemistry ; Theoretical, Physical and Computational Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Computer Science
    Notes: The importance of the inclusion of the Madelung potential in cluster models of ionic surfaces is the subject of this work. We have determined Hartree-Fock all electron wave functions for a series of MgO clusters with and without a large array of surrounding point charges (PC) chosen to reproduce the Madelung potential. The phenomena investigated include: the reactivity of surface oxygens toward CO2, atomic hydrogen, and H+; the geometry and adsorption energy of water and the vibrational shift of CO adsorbed at Mg2+ sites; the electronic structure and the hyperfine coupling constants of oxygen vacancies, the paramagnetic Fs+ centers. While some clusters give results which are virtually independent of the presence of the PCs, other clusters, typically of small size, give physically incorrect results when the PCs are not included. The embedding of the cluster in PCs guarantees a similar response for clusters of different size, at variance with the bare clusters, where the long range coulombic interactions are not included. © 1997 by John Wiley & Sons, Inc.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    A new buffering system and its use in electrophoresis and isoelectric focusing (1993)
    Weinheim : Wiley-Blackwell
    Electrophoresis 14 (1993), S. 1011-1018 
    Details
    ISSN: 0173-0835
    Keywords: Chemistry ; Biochemistry and Biotechnology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: A novel buffer system with rather unique properties particularly well suited for preparative isoelectric focusing is described. The system was developed in response to the long standing need for pH gradients formulated using inexpensive components of known chemical composition. The system is binary consisting of buffer pairs covering the pH range of 3 to 10, in increments of less than 1 pH. The components are all readily available, nontoxic, and biologically acceptable, and are selected on the basis of their dissociation constants. The requirement for each buffer pair is that there be an overlapping pH zone where both components are largely non-ionized, having a ratio of neutral species to total buffer concentration between about 0.90 and 0.99. This ratio is defined as the ‘electrophoretic reserve capacity’ (ERC). Within the above ERC range a stable pH gradient is obtained, assuring sharply resolved protein focusing. Buffer parameters, mainly pH, buffering capacity, ERC, transport numbers, and conductiviy, can be easily calculated and the buffer composition adjusted to meet requirements. All components are used at high concentration, typically of the order of up to 100 mM, yielding buffering capacities and conductivities analog to those customary in electrophoresis.
    Additional Material: 11 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/elps.11501401161
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  • 7
    Electronic Resource
    Electronic Resource
    [4-Amino-n-butyl]-β-d-GlucopyranosideHerrn Prof. Dr. Hellmut Brederck zum 60. Geburtstag in herzlicher Freundschaft gewidmet (1964)
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 675 (1964), S. 200-204 
    Details
    ISSN: 0075-4617
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Durch Umsetzung von Tetraacetyl-[4-halogen-n-butyl]-β-D-glucopyranosiden mit NH3 oder primären Aminen entstehen die entsprechenden [4-Amino (bzw. arylamino bzw. aralkylamino)-n-butyl]-β-D-glucoside, deren Acetylderivate kristallin erhalten wurden. Die gleichen Ausgangsverbindungen liefern mit Pyridin die entsprechenden Pyridiniumhalogenide.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jlac.19646750122
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  • 8
    Electronic Resource
    Electronic Resource
    SIMS matrix effects in Alx Ga1 - xAs: Influence of instrumental parameters (1989)
    Chichester [u.a.] : Wiley-Blackwell
    Surface and Interface Analysis 14 (1989), S. 31-38 
    Details
    ISSN: 0142-2421
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Notes: The influence of instrumental parameters on the matrix effects (ion and sputtering yield variations) observed in AlxGa1 - xAs are critically evaluated. Ion and sputtering yield data from three different SIMS instruments (ARL IMMA, Cameca IMS-3F and Atomika SIMS) are examined. The influence of primary ion (O2 +) energy and incident angle on the extent of surface oxidation was examined using AES. Although relative ion yields varied linearly with the matrix composition in all instances, these ion yield variations differed greatly (a factor of 50) between instruments. These differences were attributed to differences in the surface oxygen concentrations produced by the SIMS instruments. AlAs was shown to be completely oxidized under each of the SIMS ion bombardment conditions. However, the oxygen levels incorporated in GaAs and the other Al poor specimens depended largely on the incident angle and to a lesser extent on the ion energy. Small incidence angles (normal incidence) promoted the most extensive oxidation of the Al-poor specimens, resulting in the smallest ion yield variations with matrix. As with the relative ion yields, relative sputtering yields varied linearly with the matrix composition in all instances. However, in contrast to relative ion yields, the relative sputtering yields did not change significantly under the different instrumental conditions. It was concluded that incident angle and ion energy had approximately the same influence on the sputtering yields obtained from the reference and the sample matrices. Thus, the relative sputtering yields were insensitive to changes in these ion beam parameters.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/sia.740140109
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  • 9
    Electronic Resource
    Electronic Resource
    Characterization of plasma membrane redox activity from ehrlich cells (1994)
    New York, NY [u.a.] : Wiley-Blackwell
    Cell Biochemistry and Function 12 (1994), S. 149-152 
    Details
    ISSN: 0263-6484
    Keywords: Ferricyanide reductase ; glycosidases ; phospholipases ; tumour ; Chemistry ; Biochemistry and Biotechnology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Medicine
    Notes: Ferricyanide reductase activity of plasma membranes isolated from Ehrlich ascites tumour cells was very sensitive to trypsin treatment. The decreases of activity observed after treatment with different glycosidases suggests that ferricyanide reductase is a glycoprotein. The opposite effects of phospholipase A2 and phospholipase C on the redox activity indicate that the phospholipidic environment plays an important role in the function of ferricyanide reductase. Sodium ions at millimolar concentrations, and some divalent cations at micromolar concentrations (Ca2+, Mg2+, Sr2+, and Mn2+) behaved as stimulators of ferricyanide reductase activity.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cbf.290120211
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  • 10
    Electronic Resource
    Electronic Resource
    Inositolphosphoglycans possibly mediate the effects of glucagon-like peptide-1(7-36)amide on rat liver and adipose tissue (1998)
    New York, NY [u.a.] : Wiley-Blackwell
    Cell Biochemistry and Function 16 (1998), S. 51-56 
    Details
    ISSN: 0263-6484
    Keywords: GLP-1 ; inositolphosphoglycans (IPGs) ; glycosylphosphatidylinositols (GPIs) ; hepatocytes ; adipocytes ; Chemistry ; Biochemistry and Biotechnology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Medicine
    Notes: Insulin-like effects of glucagon-like peptide-1(7-36)amide (GLP-1) in rat liver, skeletal muscle and fat, and also the presence of GLP-1 receptors in these extrapancreatic tissues, have been documented. In skeletal muscle and liver, the action of GLP-1 is not associated with an activation of adenylate cyclase, and in cultured murine myocytes and hepatoma cell lines, it was found that GLP-1 provokes the generation of inositolphosphoglycan molecules (IPGs), which are considered second messengers of insulin action. In the present work, we document in isolated normal rat adipocytes and hepatocytes that GLP-1 exerts a rapid decrease of the radiolabelled glycosylphosphatidylinositols (GPIs) - precursors of IPGs - in the same manner as insulin, indicating their hydrolysis and the immediate short-lived generation of IPGs. Thus, IPGs could be mediators in the GLP-1 actions in adipose tissue and liver, as well as in skeletal muscle, through GLP-1 receptors which are, at least functionally, different from that of the pancreatic B-cell. © 1998 John Wiley & Sons, Ltd.
    Additional Material: 2 Ill.
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