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  • 1
    Electronic Resource
    Electronic Resource
    Synthesis and spectral analysis of 6-substituted-1,2,4,8,10,11-hexachloro-12H-dibenzo[d,g][1,3,2]dioxaphosphocin 6-oxides (1994)
    New York, NY [u.a.] : Wiley-Blackwell
    Heteroatom Chemistry 5 (1994), S. 507-511 
    Details
    ISSN: 1042-7163
    Keywords: Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Synthesis of several 6-substituted-1,2,4,8,10,11-hexachloro-12H-dibenzo[d,g][1,3,2]dioxaphosphocin 6-oxides and their IR, 1H, 13C, and 31P NMR and mass spectral analyses are described. Observation of geminal coupling [2J(H,H) = 16.0 Hz] between bridged methylene protons (12-CH2) suggested their non-equivalence and is consistent with a boat-chair form which may be in conformational equilibrium with either a boat-boat or a distorted and extended boatlike conformation.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/hc.520050515
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  • 2
    Electronic Resource
    Electronic Resource
    13C chemical shift assignments for isomers of some 1,2-diaroyl-3-aryl-cyclopropanes (1989)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 27 (1989), S. 807-808 
    Details
    ISSN: 0749-1581
    Keywords: 1,2-Diaroyl-3-arylcyclopropanes ; Chemical shift assignments ; Stereoisomerism ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The 13C chemical shifts of some isomeric 1,2-diaroyl-3-arylcyclopropanes have been determined. The δc, values of C-1 and C-2 of the cyclopropyl ring carbons and those of the C-4 and C-5 carbonyl carbons are used as a criterion for distinguishing between the stereoisomeric forms.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mrc.1260270816
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  • 3
    Electronic Resource
    Electronic Resource
    Immobilization of trypsin on alginic acid-poly (glycidyl methacrylate) graft copolymer (1986)
    New York, NY [u.a.] : Wiley-Blackwell
    Biotechnology and Bioengineering 28 (1986), S. 609-612 
    Details
    ISSN: 0006-3592
    Keywords: Chemistry ; Biochemistry and Biotechnology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Trypsin was immobilized onto alginic acid-poly(glycidyl methacrylate) graft copolymer (AAGMA). The resulting immobilized enzyme showed 65% of the soluble enzymatic activity. The temperature optimum was shifted by 5°C to a higher value. The pH optimum of immobilized enzyme has also been shifted by 0.5 units toward the alkaline side when compared to that of soluble enzyme. The pH stability and thermal stability are better than that of soluble enzyme.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bit.260280419
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  • 4
    Electronic Resource
    Electronic Resource
    Voltammetry of germanium telluride (1990)
    Weinheim : Wiley-Blackwell
    Electroanalysis 2 (1990), S. 337-340 
    Details
    ISSN: 1040-0397
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The voltammetric behavior of semiconductor grade germanium telluride was studied by ac and differential pulse polarography. The electrochemical behavior and analytical procedures for the simultaneous estimation of germanium and tellurium in germanium telluride are discussed. The kinetic parameters of the electrode process are evaluated.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/elan.1140020413
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  • 5
    Electronic Resource
    Electronic Resource
    Electrochemical determination of chlorothion (1989)
    Weinheim : Wiley-Blackwell
    Electroanalysis 1 (1989), S. 559-562 
    Details
    ISSN: 1040-0397
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The electrochemical behavior of the pesticide chlorothion has been studied employing various voltammetric techniques and different supporting electrolytes. These studies covered a pH range from 2.0 to 12.0 in 25% DMF-water mixtures. Adsorption complications were observed by ac polarography. Millicoulometry was employed for the determination of the number of electrons in the reduction process, and kinetic parameters were evaluated. The proposed reduction mechanism was based on the results obtained. Differential pulse polarography was used to develop an analytical method for chlorothion determination in trace levels.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/elan.1140010614
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  • 6
    Electronic Resource
    Electronic Resource
    Immobilization of trypsin on poly(alginic acid-g-glycidyl methacrylate-co-methyl methacrylate) (1987)
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 149 (1987), S. 101-110 
    Details
    ISSN: 0003-3146
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Es wird über eine Methode zur Enzymimmobilisierung durch Pfropfcopolymerisation auf Alginsäure berichtet. Glycidylmethacrylat wurde zusammen mit Methylmethacrylat als vinylierendes Agens verwendet. Für die Untersuchungen wurde das Enzym Trypsin gewählt. Der Einfluß der verschiedenen Parameter wie pH-Optimum, Temperaturoptimum, pH Stabilität, thermische Stabilität, Lagerstabilität und Wiederverwendbarkeit wurde untersucht.
    Notes: A method of enzyme immobilization by graft copolymerization onto alginic acid is reported. Glycidylmethacrylate along with methyl methacrylate was used as a vinylating reagent. The enzyme trypsin has been chosen for our studies. The effects of various parameters such as pH optima, temperature optima, pH stability, thermal stability, storage stability, and re-usability were studied.
    Additional Material: 6 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/apmc.1987.051490107
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  • 7
    Electronic Resource
    Electronic Resource
    Electron spin resonance study of γ-irradiated poly(methacrylic acid) (1994)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part B: Polymer Physics 32 (1994), S. 1787-1790 
    Details
    ISSN: 0887-6266
    Keywords: electron spin resonance (ESR) ; gamma irradiations ; PMMA ; molecular relaxations ; total curve fitting method ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Low temperature relaxations in poly(methacrylic acid) (PMAA) have been studied by electron spin resonance (ESR) spectroscopy. The observed 8 line ESR spectra of irradiated PMAA in the temperature range 77-300K (LNT-RT) is attributed to the free radicals of the type ∼ CH2—CH—CH3. Assignment of ESR spectra to free radicals has been made on the basis of magnetic parameters employed to simulate ESR spectra at different temperatures. Further, ESR spectra below LNT have been simulated, using the set of parameters employed to simulate the experimental spectrum at LNT. Magnetic parameters of the ESR spectra at LNT and below LNT indicate γ- and δ-relaxations of PMMA chains. © 1994 John Wiley & Sons, Inc.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/polb.1994.090321011
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  • 8
    Electronic Resource
    Electronic Resource
    Immobilization of trypsin on poly(alginic acid-g-glycidyl methacrylate-co-hydroxy ethyl methacrylate) (1986)
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 144 (1986), S. 183-192 
    Details
    ISSN: 0003-3146
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Um eine Matrix zur Immobilisierung von Enzymen herzustellen, wurden Alginsäure, ein natürlich vorkommendes Polysaccharid, als Rückgrat und Glycidylmethacrylat (GMA) und 2-Hydroxyethylmethacrylat (HEMA) als Monomere für die Pfropfcopolymerisation gewählt. HEMA wurde verwendet, um den hydrophilen Charakter, der durch die Einführung von GMA verlorenginge, zu erhalten. Die Immobilisierung von Trypsin geschieht durch kovalente Bindung an die Matrix. Die optimale Temperatur beträgt für das immobilisierte Enzym 35°C, und es ist bei pH 8 am stabilsten.
    Notes: To synthesize a matrix for the immobilization of enzymes, alginic acid, a naturally occurring polysaccharide has been chosen as the backbone, and glycidyl methacrylate (GMA) and 2-hydroxy ethyl methacrylate (HEMA) as monomers for graft copolymerization. HEMA was used to introduce hydrophilic character which would have been lost during the introduction of the hydrophobic monomer glycidyl methacrylate into alginic acid. Immobilization of trypsin onto this matrix takes place by covalent bonding. The temperature optimum of the immobilized enzyme was found to be 35°C and it was most stable at pH 8.
    Additional Material: 7 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/apmc.1986.051440116
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  • 9
    Electronic Resource
    Electronic Resource
    Voltammetric studies of nitrofuroxime (1991)
    Weinheim : Wiley-Blackwell
    Electroanalysis 3 (1991), S. 699-706 
    Details
    ISSN: 1040-0397
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The electrochemical reduction behavior of nitrofuroxime has been studied using do polarography, cyclic voltammetry, ac polarography, differential pulse polarography, millicoulometry, and controlled potential electrolysis in universal buffers of pH values ranging from 2.0 to 12.0 in DMF/water mixtures. Kinetic parameters such as diffusion coefficient and forward rate constant values are evaluated, and a reduction mechanism is proposed. A differential pulse polarography method is developed for the quantitative determination of nitrofuroxime in pharmaceutical formulations. The method of standard additions is used. The relative standard deviation and correlation coefficient are 1.84% and 0.991, respectively.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/elan.1140030717
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  • 10
    Electronic Resource
    Electronic Resource
    Electrochemical reduction behavior and determination of nicoumalone (1992)
    Weinheim : Wiley-Blackwell
    Electroanalysis 4 (1992), S. 725-732 
    Details
    ISSN: 1040-0397
    Keywords: Nicoumalone ; polarography ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The electrochemical reduction behavior of nicoumalone has been studied by using dc polarography, cyclic voltammetry, ac polarography, differential pulse polarography, millicoulometry, and controlled potential electrolysis in universal buffers ranging from pH 2.0 to 12.0 in DMF - water mixtures. Kinetic parameters such as diffusion coefficient (D) and forward rate constant (kf, ho) values are evaluated and a reduction mechanism is proposed. A simple and rapid differential pulse polarographic method has been developed for the determination of nicoumalone in pharmaceutical formulations using the standard addition method. The detection limit is 2.7 ng mL-1.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/elan.1140040710
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