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  • 1
    Electronic Resource
    Electronic Resource
    Bound water in the collagen-like triple-helical structure (1992)
    New York : Wiley-Blackwell
    Biopolymers 32 (1992), S. 189-195 
    Details
    ISSN: 0006-3525
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The ir amide bands of the triple-helical polytripeptides and collagens upon hydration of films are investigated. On the basis of our assignment of the amide I components, the formation of hydrogen bonds between the peptide backbone and structural water is studied. The C1O1 - HOH hydrogen bonds are found more ordered than the C3O3 - HOH hydrogen bonds. The specific incorporation of water in the triple helix is followed by multistep conformational changes and by increasing of the interpeptide hydrogen-bond strength. The formation of the polypeptide hydrate structure depending on the amino acid composition and the chain length is examined.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bip.360320209
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  • 2
    Electronic Resource
    Electronic Resource
    Die Reaktion von 1,2,3-Diaza- und 1,3,4-Thiazaphospholen mit Diphenyldiazomethan (1987)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 120 (1987), S. 597-599 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: 2,5-Dimethyl-1,2,3-diazaphosphole (1a) reacts with diphenyldiazomethane (2) on warming; with loss of N2 and addition of the Ph2C group to the PC-bond an anellated phosphirane ring (4) is formed. The order of reactivity of 1 suggests a primary cycloaddition of 2 to 1 with PC and CN linking. - 5-(Ethoxycarbonyl)-2-phenyl-1,3,4-thiazaphosphole (8) reacts with 2 already at room temperature to yield among other products the corresponding bicyclus 9.
    Notes: 2,5-Dimethyl-1,2,3-diazaphosphol (1a) reagiert beim Erwärmen mit Diphenyldiazomethan (2); unter Abspaltung von N2 entsteht durch Addition der Ph2C-Gruppe an die PC-Bindung ein anellierter Phosphiranring (4). Die Abstufung der 1-Reaktivität legt eine primäre Cycloaddition von 2 an 1 unter PC/CN-Verknüpfung nahe. - 5-(Ethoxycarbonyl)-2-phenyl-1,3,4-thiazaphosphol (8) reagiert schon bei Raumtemp. mit 2 u.a. zu dem entsprechenden Bicyclus 9.
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19871200421
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  • 3
    Electronic Resource
    Electronic Resource
    Formation of high molecular weight polythiiranes in aqueous-organic media (1984)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 185 (1984), S. 899-904 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The influence of water on the polymerization of thiirane and 2-methylthiirane with CdCO3 was studied. The polymerization process takes place only when a large interface monomer-water is formed. This is achieved by the presence of an amount of water in the reaction mixture which is comparable with that of the monomer. The polarity of the solvent does not influence the rate of formation of poly(2-methylthiirane). The polymerization is carried out in the mass of monomer or in the presence of an alcohol and a solvent not miscible with water.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1984.021850506
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  • 4
    Electronic Resource
    Electronic Resource
    Crosslinking reactions of polyphenylene type polymers containing acetyl end-groups with o-carboranylmethoxy-containing organosilazanes (1990)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 191 (1990), S. 809-814 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Carborane-containing oligoorganosilazanes (COS) (20 to 60 wt.-%) prepared by coammonolysis of (o-carboranylmethoxy)dichloro(phenyl)silane and trichloro(phenyl)silane (COS 1), or 1-chloro-1-phenyl-1-sila-2,7-dioxa-4,5-(1,2-carborano)cycloheptane and dichloro(dimethyl)-silane (COS 2), were used to crosslink polyphenylene type prepolymers on the basis of 4,4′-oxydiacetophenone and acetophenone (FPP-1). This allowed the reduction of the crosslinking temperature of FPP-1 by 100-150°C, retaining a high heat resistance of the final crosslinked polymer. Octamethylcyclotetrasilazane (15 wt.-%) was used to crosslink the carborane-containing prepolymers on the basis of 1,2-bis[4-(4-acetylphenoxy)phenyl]-o-carborane and acetophenone (FPP-2) and 1,2-bis(4-acetylbenzyl)-o-carborane and acetophenone (FPP-3). At 350°C a polymer was formed with a gel fraction amounting to 94%.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1990.021910409
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  • 5
    Electronic Resource
    Electronic Resource
    Crosslinking reactions of polyphenylene type polymers containing acetyl end-groups with bis(hydridosilyl) derivatives of o-carborane alcohols (1990)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 191 (1990), S. 801-807 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Crosslinking reactions of prepolymers of the polyphenylene type carrying acetyl end-groups, based on 4,4′-oxydiacetophenone and acetophenone (FPP-1), or 4-acetylacetophenone and 4-(4-acetylphenoxy)phenyl-o-carborane (FPP-2), by means of 20-80 wt.-% of 1,2-bis[hydrido-(dimethyl)siloxymethyl]-o-carborane (1) were investigated. It was found that the prepolymer FPP-1 is easily crosslinked in the presence of 30 wt.-% of 1 at 300°C, and the prepolymer FPP-2 at 350°C.
    Additional Material: 2 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1990.021910408
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  • 6
    Electronic Resource
    Electronic Resource
    Accurate general method for lattice approximation of three-dimensional structure of a chain molecule (1995)
    New York, NY : Wiley-Blackwell
    Proteins: Structure, Function, and Genetics 22 (1995), S. 100-109 
    Details
    ISSN: 0887-3585
    Keywords: protein structure ; RNA structure ; lattice model ; chain connectivity ; self-avoiding ; dynamic programming ; Chemistry ; Biochemistry and Biotechnology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Medicine
    Notes: An algorithm based on dynamic programming gives the lattice models having the minimal RMS deviations from the actual folds of protein (RNA, etc.) chains for a given lattice and a given orientation of the macromolecule relative to the lattice. The algorithm is applicable for 3-D lattices of any kind. The accuracy of the lattice approximation increases when the distance between neighbor chain links is not rigidly fixed. Special repulsive potentials facilitate generation of self-avoiding lattice chains. The results of model building show the efficiency and precisionof this proposed general method when compared with others. © 1995 Wiley-Liss, Inc.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prot.340220203
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  • 7
    Electronic Resource
    Electronic Resource
    Adjusting potential energy functions for lattice models of chain molecules (1996)
    New York, NY : Wiley-Blackwell
    Proteins: Structure, Function, and Genetics 25 (1996), S. 379-388 
    Details
    ISSN: 0887-3585
    Keywords: protein modeling ; lattice approximation error ; adjusting of energy functions ; Chemistry ; Biochemistry and Biotechnology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Medicine
    Notes: Lattice models of proteins can approximate off-lattice structures to arbitrary precision with RMS (root mean squared) deviations roughly equal to half the lattice spacing (Rykunov et al., Proteins 22:100-109, 1995; Reva et al., J. Comp. Biol., 1996). However, even small distortions in the positions of chain links lead to significant errors in lattice-based energy calculations (Reva et al., J. Comp. Chem., 1996). These errors arise mainly from rigid interactions (such as steric repulsion) which change their energies considerably at a range which is much smaller than the usual accuracy of lattice modeling (〉1.0 Å). To reduce this error, we suggest a procedure of adjusting energy functions to a given lattice. The general approach is illustrated with energy calculations based on pairwise potentials by Kolinski et al. (J. Chem. Phys. 98:1-14, 1993). At all the lattice spacings, from 0.5-3.8 Å, the lattice-adjusted potentials improve the accuracy of lattice-based energy calculations and Increase the correlations between off-lattice and lattice energies. © 1996 Wiley-Liss, Inc.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prot.9
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  • 8
    Electronic Resource
    Electronic Resource
    Building self-avoiding lattice models of proteins using a self-consistent field optimization (1996)
    New York, NY : Wiley-Blackwell
    Proteins: Structure, Function, and Genetics 26 (1996), S. 1-8 
    Details
    ISSN: 0887-3585
    Keywords: lattice models of proteins ; self-consistent field optimization ; self-avoiding ; Chemistry ; Biochemistry and Biotechnology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Medicine
    Notes: We present an algorithm to build self-avoiding lattice models of chain molecules with low RMS deviation from their actual 3D structures. To find the optimal coordinates for the lattice chain model, we minimize a function that consists of three terms: (1) the sum of squared deviations of link coordinates on a lattice from their off-lattice values, (2) the sum of “short-range” terms, penalizing violation of chain connectivity, and (3) the sum of “long-range” repulsive terms, penalizing chain self-intersections. We treat this function as a chain molecule “energy” and minimize it using self-consistent field (SCF) theory to represent the pairwise link repulsions as 3D fields acting on the links. The statistical mechanics of chain molecules enables computation of the chain distribution in this field on the lattice. The field is refined by iteration to become self-consistent with the chain distribution, then dynamic programming is used to find the optimal lattice model as the “lowest-energy” chain pathway in this SCF. We have tested the method on one of the coarsest (and most difficult) lattices used for model building on proteins of all structural types and show that the method is adequate for building self-avoiding models of proteins with low RMS deviations from the actual structures. © 1996 Wiley-Liss, Inc.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    Proton-transfer polyaddition reactions in syntheses of linear, branched, and functionalized poly(p-divinyl aromatics). I. Synthesis, kinetics, and mechanism of formation of linear unsaturated poly[bis(p-vinylphenyl) ether] (1996)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part A: Polymer Chemistry 34 (1996), S. 1165-1181 
    Details
    ISSN: 0887-624X
    Keywords: bis(p-vinylphenyl) ether ; step-polymerization ; polymer structure ; mechanism ; kinetics ; molecular weight distribution ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: A peculiar step-growth (cationic) polymerization of bis(p-vinylphenyl) ether (BVPE) in nonpolar or slightly polar aromatic solvents in the temperature range from 70 to 150°C in the presence of 2.5-5.0 mmol/L of p-toluenesulfonic acid has been studied. Optimum polymerization conditions were found. New linear unsaturated polymers of BVPE with terminal vinyl groups and weight-average molecular weight from 1500 to 10,000 were obtained. The structure and the formation mechanism of these oligomers and polymers were established, and the accompanying side reactions were considered. The rate constants were measured for eight temperatures, and the activation energy was found to be -42 kJ/mol. The optimum polymerization temperature was about 80°C. © 1996 John Wiley & Sons, Inc.
    Additional Material: 14 Ill.
    Type of Medium: Electronic Resource
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  • 10
    Electronic Resource
    Electronic Resource
    Fluctuation theory of hydrogen bonding in near-critical fluids (1996)
    Hoboken, NJ : Wiley-Blackwell
    AIChE Journal 42 (1996), S. 2661-2667 
    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: Recent experiments indicate that the number of hydrogen bonds in solutions increases in the critical region of the solvent. This effect can be explained by the density fluctuations near the critical point. A theory of this unusual effect is developed. The theoretical predictions are compared with the experimental data on hydrogen bonding between perfluoro-tert-butanol and dimethyl ether in supercritical sulfur hexafluoride. The theory requires no adjustable parameters and is in excellent agreement with the experimental data. Possible applications of this effect for hydrogen-bonding solutions and polymer mixtures are discussed.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/aic.690420927
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