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  • 1
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    ISSN: 0935-6304
    Keywords: Enantioselective GC ; Permethyl-β-cyclodextrin ; Cyclopropyl amino acids ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Advanced Materials 5 (1993), S. 738-741 
    ISSN: 0935-9648
    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: 3 Ill.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 30 (1992), S. 1012-1018 
    ISSN: 0749-1581
    Keywords: Peptide group proton shift effects ; Proton chemical shift computation ; Protein backbone conformation ; Solution peptide and protein structures ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: It has been found that protein NH protons on top of a peptide group plane experience large upfield conformation shifts. The joint analysis of this effect and other known effects of the peptide group on proton chemical shifts has led to a two-term empirical expression for peptide group proton chemical shift computation as a function of protein backbone conformation. Both terms are expressed by McConnell's point-dipole shielding expressions, one referred to an axis perpendicular to the peptide plane and origin in the coordinate centre of the OCN atoms and the other referred to an axis along the carbonyl bond and origin close to the oxygen atom. Values for the two constants have been determined by least-squares fitting of the C-α, H and amide NH chemical shifts of the protein ubiquitin. As a cross-check on the validity of the expression, the C-α, H and NH shifts of ribonuclease and BPTI (basic pancreatic trypsin inhibitor) have been computed. The general agreement between the observed and computed shifts and the correlation coefficients found (0.72 on average) indicate that the expression accounts for the main physical effects of the protein peptide group on the proton chemical shifts. It is shown that, together with ring current shifts, the expression explains the main characteristics of the C-α, H and amide NH chemical shifts in proteins.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 31 (1993), S. S41 
    ISSN: 0749-1581
    Keywords: 1H NMR ; Two-dimensional NMR ; Azurin ; Nickel(II)-azurin ; Paramagnetic metalloproteins ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: 1H two-dimensional NMR experiments on nickel(II)-substituted azurin have been successfully applied. Despite the short relaxation times of the hyperfine-shifted resonances, the combined use of NOESY and COSY spectra allowed the assignment of 15 resonances belonging to the metal-coordinated residues Gly-45, His-46, His-117 and Met-121. Even in the case of the two broad and furthest downfield resonances, the NOESY spectra were successful in assigning these signals to the β-CH2 protons of Cys-112. The protons of the non-coordinated residues Met-13, Phe-15 and Trp-48 were also assigned via NOESY, COSY and TOCSY experiments.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 28 (1990), S. 290-298 
    ISSN: 0749-1581
    Keywords: 2D NMR ; Mortonins A, C and D ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: High-field 2D NMR studies of mortonins were performed at 500 MHz (1H) and 125 MHz (13C). Unambiguous assignment both of the 13C data to the carbon skeleton and that of the proton chemical shifts in these molecules was achieved, together with the establishment of the configuration of the asymmetric centres. Some previously reported signals have been reassigned.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    New York, NY : Wiley-Blackwell
    ISSN: 0538-8066
    Keywords: Chemistry ; Physical Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Salt effects on the oxidation of the iron(II) complexes Fe(CN)4(bpy)2-, cis-(CN)2(bpy)2 and Fe(bpy)32+ by S2O82- as well as on the reaction Fe2+ + Co(NH3)5Cl2+ have been studied in concentrated electrolyte solutions at 298.2 K. We have gone from anion-anion to cation-cation reaction with the intermediate cases of anion-neutral and cation-anion reactions. Results show that the main cause of the kinetic salt effects observed is the interaction between supporting electrolytes and the solvent. © 1994 John Wiley & Sons, Inc.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Electroanalysis 3 (1991), S. 349-354 
    ISSN: 1040-0397
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The implementation of a pH-ISFET (ion-selective field effect transistor) planar chip in a flow-injection system by means of a specially designed flow cell and the application of the sensor to the analysis of volatile compounds is described. Ammonia and sulfur dioxide are determined by exploiting the advantages of the flow techniques combined with continuous gas diffusion. Initial species are converted to gaseous compounds, which diffuse through a microporous hydrophobic membrane into an ammonium chloride or hydrogen sulfite recipient stream, producing a pH variation that is monitored by the semiconductor detector. The linear working range extends from 1 × 10-2 to 1 × 10-4 M for the ammonium system and from 4 × 10-3 to 7 × 10-5 for the sulfur dioxide system, with relative standard deviation of about 1 and 0.5%, respectively.
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Electroanalysis 3 (1991), S. 355-360 
    ISSN: 1040-0397
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The construction of a pH-ISFET (ion-selective field effect transistor) fabricated with standard negative-channel MOS technology, compatible with complementary MOS technology, and using silicon nitride as a pH-sensitive material, is described. Its main analytical characteristics are discussed. The resulting calibration plot is linear over the pH range from 2 to 11; with a slope of 54 mV per pH unit.
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Electroanalysis 3 (1991), S. 63-69 
    ISSN: 1040-0397
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The hydrolysis reaction in an alkaline medium of the thiendodiazepine Clotiazepam has been studied by differential pulse polarography at various pH values at 25, 37, and 50°C. In an alkaline medium, Clotiazepam exhibits two well-defined polarographic peaks, attributed to the azomethine group of the parent compound and the carboxylic group of the hydrolysis product, with a potential difference of 0.160 V, practically constant in the pH range studied. Kinetic studies of the reversible hydrolysis process based on the current changes with time of the first polarographic peak in indicate that the process is a pseudo-first-order reaction with a rate constant dependent on hydroxide ion concentration. Arrhenius parameters were also calculated. A voltammetric study of the hydrolysis product has been carried out, and determination methods have been developed by differential pulse voltammetry and differential pulse polarography.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
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  • 10
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Electroanalysis 5 (1993), S. 333-338 
    ISSN: 1040-0397
    Keywords: Bumetanide ; Oxidation ; Carbon paste electrode ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The oxidative behavior of the 3-(aminosulfonyl)-5-(butylamino)-4-phenoxy-benzoic acid, Bumetanide, was studied in hydroalcoholic media (9:91 MeOH:H2O, pH range 1-9) and in two different ionic media (KNO3 and KCl) at a carbon paste electrode. The oxidation process has been shown to be irreversible and predominantly diffusion-controlled over the entire pH range and in both media. A voltammetric method was developed at pH = 2.5 (phosphate buffer) and 0.4 M KNO3 for the quantitative determination of Bumetanide. The peak current was linear with the Bumetanide concentration in the range 2.74 × 10-6 M-2.74 × 10-5 M with a detection limit of 4.39 × 10-7 M (0.16 ppm) and a reproducibility (in terms of relative standard deviation) of 3.61 and 7.60% for 10 determinations of 1.25 × 10-5 M and 4.99 × 10-6 M concentrations, respectively. The method for Bumetanide was applied to assays of pharmaceuticals (Fordiuran, 1 mg) and urine.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
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