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  • 1
    Electronic Resource
    Electronic Resource
    The interactions between wood components and formaldehyde-based resins. I. Monofunctional resin model compoundsPresented in part at the Fourth International Symposium on Wood and Pulping Chemistry, Paris, April 27-30, 1987. (1989)
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 173 (1989), S. 137-152 
    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: Die Resultate von Untersuchungen über die chemische Wechselwirkung zwischen einigen monofunktionellen Modellverbindungen, die die Struktur und Reaktivität von wärmehärtbaren Phenol- und Harnstoff-Formaldehyd-Harzen simulieren, mit Holzkomponenten (Hemicellulosen, Cellulose und Lignin) werden dargelegt. Während Hemicellulosen deutlich dazu neigen, Kondensationsprodukte mit diesen Modellverbindungen zu ergeben, reagieren Lignine in manchen Fällen weniger leicht und abhängig davon, durch welchen Prozeß sie gewonnen worden sind, und abhängig von der Art der Modellverbindung. Cellulose reagierte wegen ihrer Kristallinität nicht unter den gegebenen Bedingungen.
    Notes: Results are presented on the chemical interactions occurring when some monofunctional model compounds simulating the structure and reactivity of thermosetting phenol- and urea-formaldehyde resins are mixed with wood components (hemicelluloses, cellulose, and lignins). Whereas hemicelluloses clearly show a propensity to give condensation products with these model compounds, lignins can react less readily in some instances depending on the delignification procedure used to isolate them and on the type of model compound. Cellulose did not react under the conditions chosen, mostly because of its crystalline character.
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/apmc.1989.051730111
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  • 2
    Electronic Resource
    Electronic Resource
    Polymeric prodrugs, 6Part 5: cf. M. Azori, J. Pató, E. Csákvári, F. Tüdős, Makromol. Chem. 187, 2073 (1986).. Synthesis and examination of 6-purinethiol bound to poly(1-vinyl-2-pyrrolidone-co-maleic acid)Part of the results was included in a poster, presented at the 31st IUPAC Macromolecular Symposium, Merseburg (1987). (1989)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 190 (1989), S. 1967-1974 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: A low-molecular-weight disulfide derivative of the antileukemic agent 6-purinethiol (2) was used for coupling with a macromolecular carrier, poly(1-vinyl-2-pyrrolidone-co-maleic acid) via spacer groups. The in vitro hydrolytic stabilities of the polymeric prodrugs were examined at pH 7,2 and 8,8. An enhanced cleavage of the disulfide bridge yielding 6-purinethiol was observed. Enzymatic hydrolysis of the prodrug containing an enzyme-sensitive spacer was also done in the presence of elastase.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1989.021900820
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  • 3
    Electronic Resource
    Electronic Resource
    Sliding controller design for a nonlinear fermentation system (1989)
    New York, NY [u.a.] : Wiley-Blackwell
    Biotechnology and Bioengineering 33 (1989), S. 377-385 
    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 design of a sliding controller for a continuous fermentation process is presented. The results obtained by simulation have proved the control scheme to be very robust. Regulation of substrate concentration at its optimal value has been achieved even though process parameters change their nominal values. Chattering effects are decreased by introducing a minor modification of the control variable around the sliding surface.
    Additional Material: 14 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bit.260330402
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  • 4
    Electronic Resource
    Electronic Resource
    PCILO and CNDO calculations on the specific interaction in two model analogs of BPA-polycarbonate and a linear aliphatic polyster (1986)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part B: Polymer Physics 24 (1986), S. 239-249 
    Details
    ISSN: 0887-6266
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Previous investigations have given evidence of the existence of specific chemical interactions between poly(bisphenol-A carbonate) (PC) and a number of linear aliphatic polyesters, with the consequent formation of compatible polymer alloys. Here we address the particular kind of specific interaction that takes place in these systems by performing a quantum-mechanical study of the apparently most reasonable types of molecular interactions occurring in model compounds of the above polymers. Complete neglect of diffential overlap, (CNDO), in its CNDMEX version, and perturbative configuration using localized orbitals (PCILO) were the calculation schemes used on diphenyl carbonate (DPC) and dimethyl succinate (DMS), selected as models. It was found that, on a one-to-one basis, the DPC-DMS system is energetically more stable than the individual separate molecules; on examination of the possible interaction sites for the two chemical species, the interaction between the ester group oxygen in one DMS molecule with one of the phenyl rings in DPC appears to be the most favorable type of molecular interrelation, even though hydrogen bond formation is also possible between the oxygen atoms in DPC and the methylene hydrogens in DMS. (The former interaction decreases the total energy of the system by 0.12 kcal/mol, more than the latter.)
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/polb.1986.090240203
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  • 5
    Electronic Resource
    Electronic Resource
    The need for direct cell contact in “contact” inhibition of cell division in culture (1968)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Cellular Physiology 71 (1968), S. 1-6 
    Details
    ISSN: 0021-9541
    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Medicine
    Notes: Non-dividing mouse embryo fibroblasts which grew to a confluent cell density on one side of an ultra-thin filter did not inhibit the active multiplication of the same type of cells growing at low cell density on the other side of the filter directly opposite the confluent side. The close proximity of the cells across the filter was not sufficient to cause inhibition of cell division. The phenomenon of “contact” or “density dependent” inhibition of cell division is therefore probably not mediated by a cellular product which remains concentrated near the cell surface.The degree of contact inhibition of cell division was correlated with the local cell density on the same side of the filter. This relationship was found to be influenced strongly by the surface on which the cells were growing.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jcp.1040710102
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  • 6
    Electronic Resource
    Electronic Resource
    Growth of mouse fibroblasts in the presence of irradiated and lyophilized monolayers of the same type of cells (1968)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Cellular Physiology 71 (1968), S. 7-15 
    Details
    ISSN: 0021-9541
    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Medicine
    Notes: Certain cells, such as 3T3 mouse embryo fibroblasts, are inhibited from dividing when they grow to a characteristic cell density on a surface in tissue culture. We asked whether the inhibition of cell division could be attributed to the inert chemical composition of neighboring cells, that is, whether the residues of lyophilized cells retained the ability to inhibit the division of normal cells. In addition, we wanted to know whether cells in which DNA synthesis was imparied by irradiation would retain the capacity to effectively inhibit normal cells.To answer these questions, confluent and non-confluent layers of 3T3 cells were prepared in tissue culture dishes and the cells were either lyophilized or irrariated in situ. Fresh 3T3 cells were then added to these prepared layers and their growth was followed using radioactive label. There was no growth of added cells on the confluent monolayers of either untreated or irradiated cells. Growth was unimpeded on the monolayers of lyophilized cells. When cells were added to non-confluent cultures of either normal or irradiated cells the added cells grew until they had covered the remaining surface of the culture dish and had come into contact with the pre-existing cells. In the discussion, consideration is given to the role of available surface over which the cells can spread as well as to the possible interactions between neighboring cells.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jcp.1040710103
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  • 7
    Electronic Resource
    Electronic Resource
    Long-Range proton-proton coupling constants. I. Propanic coupling involving a methyl group 4JMeH (1989)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Computational Chemistry 10 (1989), S. 887-895 
    Details
    ISSN: 0192-8651
    Keywords: Computational Chemistry and Molecular Modeling ; Biochemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Computer Science
    Notes: An equation is formulated on the basis of theoretical INDO/FPT calculations which describes the angular dependence of the propanic long-range coupling constant 4JMeH in substituted HCCCH3 fragments. This equation is a truncated Fourier series in the torsion angle φ, HCCMe, which takes into account the dependence of the Fourier coefficients on the bond angle θ, CCMe. The substituent effects are assumed to be additive. Some parameters in the equation may be obtained from the 4JMeH couplings in propane and neopentane derivatives. The calculated effect upon 4JMeH of changes in the bond angle θ is significant and it seems to be in part the cause of some effects which have been attributed to conformational dependence.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jcc.540100705
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  • 8
    Electronic Resource
    Electronic Resource
    The kinetics of the attachment of polymer chains to reactive latex particles and the resulting latex stabilization (1985)
    New York : Wiley-Blackwell
    Journal of Polymer Science: Polymer Chemistry Edition 23 (1985), S. 795-799 
    Details
    ISSN: 0360-6376
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Poly(vinyl benzyl chloride) latex was reacted with ethanolamine and with amine terminated chain molecules containing up to 33 ethylene oxide residues. The kinetics of these reactions were essentially independent of the length of the chain carrying the amine group. An increasing length of the chains bound to the surface of the latex particles produced an increasing latex stabilization.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1985.170230313
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