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  • Wiley-Blackwell  (15)
  • Cell Press  (4)
  • 1980-1984  (19)
  • 1
    Electronic Resource
    Electronic Resource
    Quantitative structure-activity study of some enzyme-inhibitory quinazolines (1980)
    New York, NY : Wiley-Blackwell
    International Journal of Quantum Chemistry 17 (1980), S. 821-831 
    Details
    ISSN: 0020-7608
    Keywords: Computational Chemistry and Molecular Modeling ; Atomic, Molecular and Optical Physics
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Relationships are formulated to explain the variation in dihydrofolate reductase inhibitory potency for a series of 25 substituted quinazolines, with an antineoplastic potential. Highly significant correlations are obtained using CNDO/2-3R calculated indices and/or the empirically estimated molecular polarizability as independent variables. The MO calculated indices employed are the atomic polarizability, as defined herein, and bond energy. The molecular polarizability is represented by a simple sum of environment independent partial atomic polarizabilities. The partial polarizabilities, reported here for H, C, N, O, F, S, Cl, and Br, are obtained from a multiple regression forced through the origin.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/qua.560170502
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  • 2
    Electronic Resource
    Electronic Resource
    Adsorption of dyestuffs onto chitin. External mass transfer processes (1982)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 27 (1982), S. 4251-4261 
    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 effect of several variables on the adsorption rate of four dyestuffs onto chitin was studied. A model is proposed enabling the film mass transfer coefficients to be determined. The coefficients were independent of initial dye concentration, chitin mass, chitin particle size, and temperature; a slight dependence with agitation was obtained. The film mass transfer coefficients at 400 rpm were 2.8×10-3, 2.9×10-3, 3.9×10-3, and 0.9×10-3 cm/s for Acid Blue 25, Acid Blue 158, Mordant Yellow 5, and Direct Red 85, respectively.
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1982.070271116
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  • 3
    Electronic Resource
    Electronic Resource
    The adsorption of dyes onto chitin in fixed bed columns and batch adsorbersCorrected proofs Received March 5, 1984 (1984)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 29 (1984), S. 1499-1514 
    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: Chitin has the ability to adsorb substantial quantities of dyestuffs from aqueous solutions. Consequently, it may be a useful adsorbent for effluent treatment from textile mills. The design procedures for batch and continuous fixed bed adsorption columns have been investigated for four dyestuffs, namely, CI Acid Blue 25 (Telon Blue Anl, Bayer), CI Acid Blue 158 (Neolan Blue 29, Ciba Geigy) CI Mordant Yellow 5 (Eriochrome Flavine A, Ciba Geigy), and CI Dirert Red 84 (Solophenyl Brown 3RL, Ciba Geigy). The main fixed bed system variables studied are bed height, dye flow rate, and chitin particle size, and these effects have been incorporated into a simplified design model.
    Additional Material: 14 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1984.070290504
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  • 4
    Electronic Resource
    Electronic Resource
    Derivatization of β-propiolactone in biological mixtures for enhanced gas chromatographic mass spectrometric determinations (1981)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 8 (1981), S. 327-331 
    Details
    ISSN: 1052-9306
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Detection and identification of low levels (≤200 ppb) of free β-propiolactone in complex biological mixtures were achieved through in situ chemical derivatization and subsequent gas chromatographic mass spectrometric determination of the products. β-Propiolactone, when reacted with octadecylamine, followed by trimethylsilylation, yielded a derivative which exhibited both good gas chromatographic characteristics and highly interpretable mass spectrometric data.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bms.1200080802
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  • 5
    Electronic Resource
    Electronic Resource
    Adsorption of dyes on chitin. I. Equilibrium studies (1982)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 27 (1982), S. 3043-3057 
    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: Equilibrium isotherms have been studied for the adsorption of four dyestuffs, namely, Acid Blue 25, Acid Blue 158, Mordant Yellow 5, and Direct Red 84, onto chitin. Langmuir and Freundlich constants have been determined and the effects of chitin particle size and solution temperature have been investigated. Theoretical isotherms have been compared with experimental data and good agreement was obtained using a composite isotherm of the general form: Ye = iCe/(1 + jCem), where i,j, and m are constants.
    Additional Material: 12 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1982.070270827
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  • 6
    Electronic Resource
    Electronic Resource
    The adsorption of dyes in chitin. III. Intraparticle diffusion processesCorrected proofs received March 11, 1983 (1983)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 28 (1983), S. 1767-1778 
    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: Intraparticle diffusion processes for the adsorption of dyestuffs onto chitin have been studied. The amount of dye adsorbed per gram of chitin has been plotted against the square root of time. The slope of this plot is linear and has been defined as a rate parameter k. This rate parameter has been determined for a number of process variables, including initial dye concentration, agitation, chitin particle size, chitin mass, temperature, and solution pH. However, sometimes two and even three linear regions are apparent on the root time plots indicating a possible branched pore mechanism. The controlling mechanisms are due to macropores and micropores in the chitin particle creating rapidly and slowly diffusing regions.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1983.070280519
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  • 7
    Electronic Resource
    Electronic Resource
    Lectin receptor proximity on HL-60 leukemia cells determined by fluorescence energy transfer using flow cytometry (1984)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Cellular Physiology 121 (1984), S. 501-507 
    Details
    ISSN: 0021-9541
    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Medicine
    Notes: Fluorescence energy transfer using flow cytometric measurements was utilized to determine the proximity of concanavalin A receptors on the surface of HL-60 promyelocytic leukemia cells before and after induction of differentiation. The HL-60 cells were induced to differentiate into granulocytes using dimethylsulfoxide and into macrophages using 12-O-tetradecanoylphorbol-13-acetate. Concanavalin A was labeled with either fluorescein (donor chromophore) or tetramethylrhodamine (acceptor chromophore), and these species were used to determine lectin proximity. With granulocytic differentiation, the amount of concanavalin A bound remained constant, but a decrease in receptor density was observed. During macrophage differentiation, however, both receptor density and receptor number increased. The increase in concanavalin A binding during differentiation appears to be a result of maturation rather than an initiating event.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jcp.1041210308
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  • 8
    Electronic Resource
    Electronic Resource
    Peptide studies using a fast atom bombardment high field mass spectrometer and data system. 2 - characteristics of positive ionization spectra of peptides, m/z 858 to m/z 5729 (1983)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 10 (1983), S. 408-419 
    Details
    ISSN: 0306-042X
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Sixteen peptides ranging in molecular weights from 858 to 5729 were examined under positive ionization fast atom bombardment conditions employing a high field magnet mass spectrometer and data system. The contributions of the polyisotopic elements to the molecular protonated ion envelope become important in the interpretation of the data at higher mass. For masses less than 2000 u, the most abundant ion within this envelope is the monoisotopic molecular protonated ion. Above 2000 u, the most abundant ion in the envelope is a polyisotopic molecular protonated ion. Characterization of the peptide requires identification of both the molecular protonated ion envelope and significant fragment ions. Partial spectra displaying both the molecular ion and significant fragment ions are presented for mastoparan (mol. wt = 1478), somatostatin (mol. wt = 1637), bovine parathyroid hormone (1-34) (mol. wt = 4106), and bovine insulin (mol. wt = 5729). A partial spectrum for bovine ribonuclease A (mol. wt = 13673) displayed significant fragment ions that identified the protein. The types of fragment ions included those that indicated the amino acid sequence and the location of disulfide bonds. The abundance of these ions appears to be influenced by the characteristics of the noble gas fast atom beam and the sample matrix.
    Additional Material: 12 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bms.1200100705
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  • 9
    Electronic Resource
    Electronic Resource
    Peptide studies using a fast atom bombardment high field mass spectrometer and data system: 3 - negative ionization: Mass calibration, data acquisition and structural characterization (1983)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 10 (1983), S. 387-393 
    Details
    ISSN: 0306-042X
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Under negative ionization conditions, nominal mass calibration of the fast atom bombardment high field mass spectrometer and data system was accomplished using cesium iodide/glycerol as a reference. Mass calibration at -8 kV accelerating potential extends from m/z 387 to m/z 2170 using xenon fast atoms. Negative xenon FAB mass spectra for human angiotensin I and human gastrin I complement their positive fast atom bombardment spectra. Negative xenon fast atom bombardment spectra of underivatized peptides exhibit molecular proton-abstracted ion envelopes and structurally significant fragment ions. Peptide mixture analysis under negative xenon fast atom bombardment reveals peptide molecular ion envelopes of higher relative intensities than under positive xenon fast atom bombardment.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bms.1200100609
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  • 10
    Electronic Resource
    Electronic Resource
    Ion cyclotron resonance studies of alkylsilyl ions: V - The reactions of alcohols and ethers with the allyldimethylsilyl cationPart IV: J. Chem. Soc. Perkin Trans. 2 in press. Also part CXXVII in the series Electron Impact Studies. Part CXXVI: J. Chem. Soc. Chem. Commun. 230 (1979). (1980)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 15 (1980), S. 15-17 
    Details
    ISSN: 0030-493X
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Diallyldimethylsilane provides a source of the allyldimethylsilyl cation in the ion cyclotron resonance spectrometer; reaction of this cation with alcohols (ROH) produces adducts which decompose by loss of C3H6 to yield the ion \documentclass{article}\pagestyle{empty}\begin{document}$ \left[{{\rm Me}_2 \mathop {\rm S}\limits^{\rm + } {\rm i} - {\rm OR}} \right] $\end{document}. This elimination is thought to occur by a 1,5-hydrogen shift, together with either stepwise or concerted silicon-carbon bond cleavage. The corresponding aducts from ethers R—O—R1 (R1≥R, R1≥Et) first lose (R1—H·) and then undergo the elimination described above.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/oms.1210150107
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