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  • 1
    Electronic Resource
    Electronic Resource
    Weinheim [u.a.] : Wiley-Blackwell
    Materials and Corrosion/Werkstoffe und Korrosion 46 (1995), S. 515-519 
    ISSN: 0947-5117
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: Korrosion von Bronze durch Essig- und Ameisensäuredämpfe, Schwefeldioxyd und NatriumchloridpartikelVorliegende Arbeit behandelt die Korrosion von Bronze mit und ohne künstlicher Patina durch Essig- und Ameisensäuredämpfe, Schwefeldioxyd und Natriumchlorid bei relativer Luftfeuchtigkeit von 100%. Die eingesetzten Verfahren waren Gravimetrie, Röntgenstrahlenbeugungsanalyse, Infrarotanalyse und Rasterelektronenmikroskopie. Wie Schwefeldioxyd und Natriumchlorid erzeugen auch Essig- und Ameisensäuredämpfe auf Bronze eine starke Korrosion. Die wichtigsten identifizierten Bestandteile sind Cuprit, Kupferschwefel, hydratisiertes Kupfersulfat, Kupferazetat und Kupferformiat.
    Notes: This paper studies the corrosion of patinated and unpatinated bronze by acetic and formic acid vapours, sulphur dioxide and sodium chloride salt particles, at 100% relative humidity. Weight loss, X-ray diffraction, infrared and scanning electron microscopy were the techniques used. Acetic and formic acid vapours, sulphur dioxide and sodium chloride produce a high corrosion rate on bronze. In general, no protective effect was found by the patina on bronze. The principal compounds identified were Cu2O, Cu2S, Cu5(SO4)2(OH)6 · 5H2O, Cu(CH3CO2)2 · XH2O and Cu(HCO2)2.
    Additional Material: 4 Ill.
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  • 2
    Electronic Resource
    Electronic Resource
    New York, NY : Wiley-Blackwell
    International Journal of Quantum Chemistry 65 (1997), S. 767-785 
    ISSN: 0020-7608
    Keywords: Chemistry ; Theoretical, Physical and Computational Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Molecular orbital calculations were carried out for the dimerization step in the polymerization process of vinyl acetate and styrene through free radicals and ionic mechanisms. The calculations were performed for monomers, dimers, their positive and negative ions, and free radicals. The minimum-energy geometry is achieved in all cases, the geometrical and electronic parameters are analyzed, a dimerization reaction pathway is proposed, and the heats of polymerization obtained are in excellent agreement with experimental data.   © 1997 John Wiley & Sons, Inc. Int J Quant Chem 65: 767-785, 1997
    Additional Material: 12 Ill.
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  • 3
    ISSN: 1040-0397
    Keywords: Testosterone thiosemicarbazone ; Immunology ; Adsorptive stripping voltammetry ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The electroanalytical behavior of testosterone thiosemicarbazone (TT) has been investigated by linear sweep and differential pulse voltammetry with and without adsorptive preconcentration on a hanging mercury drop electrode (HMDE). The adsorptive stripping response has been evaluated with respect to preconcentration time and potential, drop size, scan rate, and other variables. Measurement of a selected reduction wave enables the determination of TT in the μg L-1 range, with a detection limit of 100 ng L-1 (10 min preconcentration time). The determination can also be carried out in a urine/aqueous NaClO4 (2/8) medium. The immunological interaction of TT with the testosterone specific antibody can be electrochemically monitored via the decrease in the reduction wave, as described previously. This property is discussed as a tool for the determination of testosterone and its specific antibody by competitive immunoassay with amperometric detection in real matrices such as urine.
    Additional Material: 7 Ill.
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  • 4
    Electronic Resource
    Electronic Resource
    Hoboken, NJ : Wiley-Blackwell
    Journal of Biomedical Materials Research 40 (1998), S. 171-179 
    ISSN: 0021-9304
    Keywords: hydroxyapatite ; titanium ; calvarial cells ; cell-specific alkaline phosphatase activity ; bone-related proteins gene expression ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Medicine , Technology
    Notes: Rat calvarial cell mitogenic behavior was investigated on various biomaterials coated with Matrigel®, a basement membrane matrix containing growth factors. Low (20-40%) and high (70-90%) crystallinity hydroxyapatite (rHA and cHA), rough titanium (Ti), and tissue culture polystyrene (TP) surfaces were compared. Surface chemistry and calcium resorption of HA coatings, alkaline phosphatase activity (APA), and growth of cells were measured for Matrigel®-coated and uncoated surfaces at 2, 7, and 14 days. Gene expression for four noncollagenous bone-related proteins (osteonectin, osteopontin, alkaline phosphatase, and osteocalcin) was also investigated by reverse transcription and polymerase chain reaction up to 28 days. Ca concentration in incubating solutions increased with time for the two types of HA coatings and was always greater for rHA than cHA. Surface chemistry and coating dissolution rates were not affected by the presence of Matrigel® or cells throughout the study. APA of cells on the two HA-coated surfaces was comparably enhanced in the presence of Matrigel® and was greater than on Ti surfaces. Only HA surfaces showed an increased APA of cells with time in the presence of Matrigel®. Cell growth peaked at 7 days and was greatest for cells on the two HA surfaces and without Matrigel®. At 14 days, cell growth was comparable on the four surfaces. The presence of HA and Matrigel® enhanced cell-specific APA at 14 days. Gene expression for all four proteins investigated showed no differences between surfaces after 7 days. At 2 and 7 days, gene expression was indicative of proliferation for Ti, and of proliferation, differentiation, and mineralization for HA and TP more so without Matrigel®. The addition of this matrix significantly enhanced mitogenicity of calvarial cells on HA only after 14 days. Matrigel® eliminated differences seen between the two HA coatings. Gene expression was not enhanced or inhibited by the presence of Matrigel®. © 1998 John Wiley & Sons, Inc. J Biomed Mater Res, 40, 171-179, 1998.
    Additional Material: 6 Ill.
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  • 5
    Electronic Resource
    Electronic Resource
    New York, NY : Wiley-Blackwell
    International Journal of Quantum Chemistry 65 (1997), S. 867-875 
    ISSN: 0020-7608
    Keywords: Chemistry ; Theoretical, Physical and Computational Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Structural parameters and energy have been calculated for C1-3 and C9 clusters using density functional theory through the deMon program. The C1-3 clusters were fully optimized using deMon; different basis sets were tested in order to choose the suitable one to be used in the C9 clusters. In the case of C2 the results were compared with experimental values. DZVP2 basis was selected because it always gave the closest value to the experimental data. The C9 carbon clusters were designed in relation to C(100) diamond surface. The energies of the nonrelaxed and relaxed surfaces with and without hydrogen were calculated. In the same way CH3-relaxed and CH2-relaxed species were calculated. The diamond growth mechanism proposed in the literature was evaluated by an energy analysis. The C(SINGLE BOND)CH3 distance is reported.   © 1997 John Wiley & Sons, Inc. Int J Quant Chem 65: 867-875, 1997
    Additional Material: 5 Ill.
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  • 6
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Eine Reihe synthetischer Polyglukose-carboxylderivate mit verschiedenem Carboxylgehalt wurde zur Hemmung der Ribonuklease-entpolymerisierenden Wirkung an Ribonukleinsäure, die nach der KUNITZ-Probe gemessen wurde, verwandt. Die enzymhemmende Wirkung nahm mit der Ladungsdichte der Polyglukose-carboxylderivate stark zu.Durch diese und ähnliche Experimente ergibt sich, daß COULOMB-Anziehungskräfte beim Zusammenführen von Enzym und Substrat eine wichtige Rolle spielen.
    Notes: A series of synthetic polyglucose carboxyl derivatives with different carboxyl content has been used to inhibit ribonuclease depolymerizing activity on ribonucleic acid as measured by the KUNITZ assay. The enzyme inhibitory activity increased greatly with the charge density of the polyglucose carboxyl derivatives.From this and similar experiments it is concluded, that COULOMBIC attracting forces have an important role in bringing the enzyme and the substrate together.
    Additional Material: 4 Ill.
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  • 7
    Electronic Resource
    Electronic Resource
    New York : Wiley-Blackwell
    Journal of Polymer Science Part A: General Papers 1 (1963), S. 3511-3517 
    ISSN: 0449-2951
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: A general procedure is presented for the preparation of diethylaminohydroxylpropyl ethers of polysaccharides. This involves reaction between various ratios of 1-diethylamino-2,3-epoxypropane and the polysaccharide (amylose, amylopectin, dextran, and a chemically synthesized polygalactose) and concentrated aqueous solution of sodium carbonate. These ratios control the degree of substitution, and give as high as 1.4 cationic groups per monosaccharide unit in the case of certain polysaccharides. The cationic polysaccharides possess high hemagglutinating activity which is proportional to the degree of substitution. Other biological applications are reviewed.
    Additional Material: 2 Tab.
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