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  • Chemistry  (33)
  • Wiley-Blackwell  (33)
  • Oxford University Press
  • 1985-1989  (6)
  • 1980-1984  (12)
  • 1975-1979  (15)
  • 1940-1944
  • 1
    Electronic Resource
    Electronic Resource
    Time-dependent Hartree calcuations of nucleic acid hypochromism (1976)
    New York : Wiley-Blackwell
    Biopolymers 15 (1976), S. 1873-1875 
    Details
    ISSN: 0006-3525
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bip.1976.360150923
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  • 2
    Electronic Resource
    Electronic Resource
    1,3-Dipolare Cycloadditionen, 88. C-Methyl-N-phenylnitrilimin und die Regiochemie seiner Cycloadditionen (1983)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 116 (1983), S. 3039-3061 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: 1,3-Dipolar Cycloadditions, 88. C-Methyl-N-phenylnitrilimine and the Regiochemistry of its CycloadditionsThe title compound, a representative of the little known C-alkylnitrilimines, is accessible by three routes: NaNO2 elimination from sodium (α-nitroethylidene)phenylhydrazine in boiling acetonitrile, photolysis of 5-methyl-2-phenyltetrazole, and the thermolysis of this tetrazole at 160-180°C. Pros and cons of these methods are considered in the report on the cycloadditions to numerous olefinic and acetylenic dipolarophiles. Structures and yields of the 2-pyrazolines and pyrazoles formed are determined. Methyl acrylate, crotonate and cinnamate as well as acetylenic carboxylic esters give rise to pairs of regioisomeric adducts. The independence of the product ratio on the precursor demonstrates the occurrence of a common intermediate, the C-methyl-N-phenyl-nitrilimine. The deviation observed in the case of methyl propiolate deserves attention.
    Notes: Das im Titel genannte Nitrilimin wird als Vertreter der nahezu unbekannten C-Alkylnitrilimine auf drei Wegen zugänglich gemacht: Zerfall des Natrium-(α-nitroethyliden)phenylhydrazins in siedendem Acetonitril, Photolyse des 5-Methyl-2-phenyltetrazols sowie Thermolyse dieses Tetrazols bei 160-180°C. Vor- und Nachteile dieser Methoden werden erörtert anhand der Cycloadditionen an zahlreiche olefinische und acetylenische Dipolarophile. Die gebildeten 2-Pyrazoline und Pyrazole werden in Struktur und Ausbeute bestimmt. Acrylsäureester und seine β-substituierten Abkömmlinge sowie acetylenische Carbonsäureester liefern Paare regioisomerer Addukte. Die Unabhängigkeit des Produktverhältnisses von der Methode der Freisetzung des C-Methyl-N-phenylnitrilimins belegt das Auftreten der gemeinsamen Zwischenstufe; Abweichungen wie im Fall des Propiolsäureesters verdienen Aufmerksamkeit.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19831160905
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  • 3
    Electronic Resource
    Electronic Resource
    1,3-Dipolare Cycloadditionen, 89. Neue Beiträge zur Chemie des Diphenylnitrilimins (1983)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 116 (1983), S. 3062-3070 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: 1,3-Dipolar Cycloadditions, 89. New Contributions to the Chemistry of DiphenylnitrilimineMethyl propiolate, tetrolate, and phenylpropiolate combine with diphenylnitrilimine (1) to afford regioisomeric cycloadducts; the preferential orientation shifts in the sequence given from the pyrazole-5-carboxylic ester to the 4-carboxylic ester. Corresponding isomer ratios substantiate the occurrence of 1 in the reaction of (α-chlorobenzylidene)phenylhydrazine + triethylamine and in the photolysis or thermolysis of 2,5-diphenyltetrazole. - Chloroethylenes and 1 furnish 5-chloropyrazolines which eliminate HCl. - The sodium salt of (α-nitrobenzylidene)phenylhydrazine likewise is a source of 1. The electrophilic propiolic ester gives rise to an adduct mixture which is richer in methyl 1,3-diphenylpyrazole-4-carboxylate than that characteristic of 1, thus suggesting a second reaction pathway.
    Notes: Propiolsäure-, Tetrolsäure- und Phenylpropiolsäureester treten mit Diphenylnitrilimin (1) zu den beiden regioisomeren Cycloaddukten zusammen, wobei sich die Vorzugsorientierung in der genannten Folge vom Pyrazol-5-carbonsäureester zum -4-carbonsäureester verschiebt. Gleiche Isomerenverhältnisse belegen das Auftreten von 1 bei der Reaktion des (α-Chlorbenzyliden)-phenylhydrazins mit Triethylamin sowie bei der Photolyse oder Thermolyse des 2,5-Diphenyltetrazols. - Chlorierte Ethylene vereinigen sich mit 1 zu 5-Chlorpyrazolinen, die HCl abgeben. - Auch das Natriumsalz des (α-Nitrobenzyliden)phenylhydrazins bietet eine Quelle für 1. Abweichungen vom üblichen Orientierungsverhalten beobachtet man bei Propiolsäure-methylester; höhere Gehalte am 1,3-Diphenylpyrazol-4-carbonsäureester weisen auf einen zusätzlichen Reaktionsweg.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19831160906
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  • 4
    Electronic Resource
    Electronic Resource
    Comments on microbial growth rate (1975)
    New York, NY [u.a.] : Wiley-Blackwell
    Biotechnology and Bioengineering 17 (1975), S. 279-283 
    Details
    ISSN: 0006-3592
    Keywords: Chemistry ; Biochemistry and Biotechnology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bit.260170214
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  • 5
    Electronic Resource
    Electronic Resource
    Dynamics of mixed populations having complementary metabolism (1975)
    New York, NY [u.a.] : Wiley-Blackwell
    Biotechnology and Bioengineering 17 (1975), S. 1065-1081 
    Details
    ISSN: 0006-3592
    Keywords: Chemistry ; Biochemistry and Biotechnology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: The dynamics of a system of two microbial populations having complementary metabolism are investigated by means of simple mathematical models of growth. Complementary metabolism as used here means that each population produces a substance - not present in the initial or feed medium - required by the other for growth. The simple models indicate that (1) something other than lack of the substrate or growth factor produced by its partner must limit the growth of at least one population and (2) the coexistence steady state of such populations in continuous culture is not stable with respect to large perturbations, though it is stable with respect to a wide range of perturbations.
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bit.260170709
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  • 6
    Electronic Resource
    Electronic Resource
    Further studies on the mechanism of cell disruption by extreme pressure extrusion (1975)
    New York, NY [u.a.] : Wiley-Blackwell
    Biotechnology and Bioengineering 17 (1975), S. 465-479 
    Details
    ISSN: 0006-3592
    Keywords: Chemistry ; Biochemistry and Biotechnology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: The use of another air operated extreme pressure hydraulic pump fitted with either a needle valve or a simple microbore tube is described, together with the figures obtained for the soluble protein released from suspensions of commercially obtained baker's yeast (Saccharomyces cerevisiae). The theory of the mechanism is also discussed.
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bit.260170402
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  • 7
    Electronic Resource
    Electronic Resource
    Molecular diffusion in polymer solutions (1979)
    Hoboken, NJ : Wiley-Blackwell
    AIChE Journal 25 (1979), S. 1-24 
    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: Methods for estimating mutual diffusion coefficients for polymer-solvent systems are reviewed. Procedures are recommended for the determination of the temperature, concentration, and molecular weight dependences of diffusivities both for dilute and concentrated solutions.
    Additional Material: 20 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/aic.690250102
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  • 8
    Electronic Resource
    Electronic Resource
    Axial dispersion through tube constrictions (1980)
    Hoboken, NJ : Wiley-Blackwell
    AIChE Journal 26 (1980), S. 9-15 
    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: Tracer gas dispersion was measured for laminar flow through three different tube constrictions, at orifice Reynolds numbers between 10 and 5000 and Schmidt numbers of 0.213 and 0.769. Each constriction generates a confined jet which significantly enhances axial dispersion at intermediate Reynolds numbers ranging from 100 to 1000.
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/aic.690260103
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  • 9
    Electronic Resource
    Electronic Resource
    A compartmental dispersion model for the analysis of mixing in tube networks (1977)
    Hoboken, NJ : Wiley-Blackwell
    AIChE Journal 23 (1977), S. 169-176 
    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 compartmental dispersion model of longitudinal mixing in tube networks has been developed. The ability of this model to predict the impulse response of helium, benzene vapor, and sulfur hexafluride tracer gases in two and in five generation symmetric network models of the large airway system of the lung has been tested over an air flow range of 1 to 400 ml/s.The results imply that velocity profile distortion and secondary flows in branching regions have only a small effect upon the overall longitudinal mixing when flow is directed toward the higher-order generations. On the other hand, accurate prediction of the data requires adequate treatment of the finite rate of evolution of the Taylor dispersion occurring in these tube networks.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/aic.690230205
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  • 10
    Electronic Resource
    Electronic Resource
    Nylon 6,6 copolyamides of bis(2-carboxyethyl) methylphosphine oxide (1988)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 35 (1988), S. 215-227 
    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: Copolyamides of nylon 6,6 with bis(2-carboxyethyl)methylphosphine oxide (CEMPO) were prepared by melt polycondensation of nylon 6,6 salt with CEMPO and hexamethylene diamine. The effect of CEMPO upon melting point, moisture regain, boiling water shrinkage, water wicking, tensile properties, thermal stability, static dissipation, and flammability of nylon 6,6 fibers and fabrics was determined. The fiber properties were greatly affected by the high water absorption and solubility characteristics of the phosphine oxide linkage. However, crystallinity and orientation were not greatly disturbed by up to 30-40M% CEMPO substitution in nylon 6,6. The copolyamides were of improved flame resistance compared to nylon 6,6 and were also found to give improved flame resistance in blends of the copolymer with various commercial plastics. In addition, CEMPO and the corresponding diamine, bis(3-aminopropyl)methylphosphine oxide were used to prepare a series of cycloaliphatic and aromatic ring-containing polyamides, but problems were encountered with moisture sensitivity and low melting points with some of these polymers.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1988.070350116
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