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  • 1
    Electronic Resource
    Electronic Resource
    Ca2+ binding cyclic octapeptides having an alternating sar and a hydrophobic amino acid in the sequence (1989)
    New York : Wiley-Blackwell
    Biopolymers 28 (1989), S. 1235-1246 
    Details
    ISSN: 0006-3525
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Cyclic octapeptides having alternating Sar and hydrophobic amino acid sequences, such as cyclo[Lys(Z)-Sar-Leu-Sar-Leu-Sar-Leu-Sar] (C8KL), cyclo[Glu(OMe)-Sar-Lys(Z)-Sar-Leu-Sar-Leu-Sar] (C8KE), and cyclo[Lys(Suc)-Sar-Leu-Sar-Leu-Sar-Leu-Sar][C8K(Suc)L, Suc represents succinic acid], were synthesized. These cyclic octapeptides formed a complex selectively with Ca2+. Upon complexation, trans peptide bonds of Sar residues were isomerized to cis peptide bonds. C8KL and C8KE showed very similar characteristics of Ca2+ binding, extraction of Ca2- from an aqueous solution to a chloroform solution, and Ca2+ transport through a liquid chloroform membrane. C8KL transported Ca2+ across the lipid bilayer membrane above the phase-transition temperature, while C8KE and C8K(Suc)L did not. Therefore, the transport of Ca2+ through the lipid bilayer membrane is very sensitive to the hydrophobicity of the carrier molecule.
    Additional Material: 10 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bip.360280705
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  • 2
    Electronic Resource
    Electronic Resource
    Antistatic modification of polyester with carboxyterminated poly(oxyethylene) (1994)
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 217 (1994), S. 129-137 
    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: Carboxy-terminierte Polyoxyethylene (PEO-acid) mit zahlenmittleren Molekulargewichten Mn = 8400, 3300 und 1000 wurden zur antielektrostatischen Modifizierung von Polyethylenterephthalat (PET) verwendet. Fasern aus PET-PEO-acid-Blends mit 2,0 oder 5,0 Gew.-% PEO-acid wurden bei 285°C mit einem normalen Extruder aus der Schmelze gesponnen und anschließend bei 80°C um das ca. 4,5fache verstreckt. Die Verarbeitbarkeit beim Verspinnen und Verstrecken war bei Verwendung von PEO-acid mit hohen Molekulargewichten ausgezeichnet. Die anti-elektrostatischen Eigenschaften wurden ebenfalls mit steigendem PEO-acid-Molekulargewicht besser. Da eine Umesterung beim Verspinnen nur in geringem Ausmaß stattfand, blieben die mechanischen Eigenschaften der Blend-Fasern gegenüber den PET-Fasern nahezu unverändert.
    Notes: Carboxy-terminated poly(oxyethylenes) (PEO-acid) with number-average molecular weights Mn = 8400, 3300, and 1000 were used for antielectrostatic modification of poly(ethylene terephthalate) (PET). The blend PET fibers containing 2.0 and 5.0 wt.-% of PEO-acids were melt-spun at 285°C with an ordinary extruder and then drawn about 4.5-fold at 80°C. The processabilities of spinning and drawing were excellent at higher molecular weights of PEO-acid. The anti-electrostatic properties of the blend fibers became also improved with increasing molecular weight of PEO-acid. Since little ester interchange reaction took place between PET and PEO-acid during meltspinning, the blend fibers could retain almost the same mechanical properties as the original PET fiber.
    Additional Material: 4 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/apmc.1994.052170113
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  • 3
    Electronic Resource
    Electronic Resource
    The cystine-stabilized α-helix: A common structural motif of ion-channel blocking neurotoxic peptides (1991)
    New York : Wiley-Blackwell
    Biopolymers 31 (1991), S. 1213-1220 
    Details
    ISSN: 0006-3525
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Neurotoxic peptides from venoms of scorpions and honey bees exhibit a consensus pattern in the two disulfide bridgings related to the sequence portions Cys-X-Cys and Cys-X-X-X-Cys. A revised three-dimensional structure of charybdotoxin, as determined by two-dimensional nmr spectroscopy, confirms that the consensus cystine dislocation generates in all these toxins a common structural element, i.e., the cystine-stabilized α-helical (CSH) motif, which may be correlated with their common ion channel blocking activity.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bip.360311009
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  • 4
    Electronic Resource
    Electronic Resource
    Preparation and Some Reactions of Selenium and Tellurium Bis(dithiocarboxylates) (1985)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 118 (1985), S. 1696-1708 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Darstellung und einige Reaktionen von Selen- und Tellur-bis(dithiocarboxylaten)Durch Umsetzung von Piperidinium- oder Natrium-dithiocarboxylaten 1 mit Natrium-seleno-oder -telluropentathionaten wurden die Selen- 2 und Tellur-bis(dithiocarboxylate) 3 dargestellt. Die orangefarbenen oder roten Kristalle sind thermisch stabil und nicht feuchtigkeitsempfindlich. Durch Umsetzung von 2 oder 3 mit Halogenen oder N-Chlor- oder N-Bromsuccinimid wurden Haloselen- 4, 5 und Halotellur-dithiocarboxylate 6-8 mit guten Ausbeuten erhalten. Die n →πast;-Übergänge der Thiocarbonylgruppen in 2-8 treten bei kleineren Wellenlängen auf (hypsochrome Verschiebung) als die der entsprechenden Bis(thioacyl)-trisulfide sowie Dithio- und Thionselenolester.
    Notes: A number of selenium- 2 and tellurium bis(dithiocarboxylates) 3 have been prepared by the reaction of piperidinium or sodium dithiocarboxylates 1 with sodium seleno- and telluropentathionates. The orange or red products are stable towards heat and moisture. It was found that 2 and 3 react with halogens and N-chloro- and N-bromosuccinimide to give the corresponding haloselenium- 4, 5 and halotellurium dithiocarboxylates 6-8 in good yields. The n →π* transitions of the thiocarbonyl groups in 2-8 are observed in a region of shorter wavelengths (hypsochromic shift) than those of the corresponding bis(thioacyl) trisulfides and dithio- and thioneselenol esters.
    Additional Material: 4 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19851180435
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  • 5
    Electronic Resource
    Electronic Resource
    Polyesters II: A review of phase behavior in binary blends: Amorphous, crystalline, liquid crystalline, and on transreaction (1989)
    Stamford, Conn. [u.a.] : Wiley-Blackwell
    Polymer Engineering and Science 29 (1989), S. 55-62 
    Details
    ISSN: 0032-3888
    Keywords: Chemistry ; Chemical Engineering
    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: Thermal and mechanical studies on many linear polyesters have revealed their behavior in crystalline, liquid crystalline, and amorphous phases. Their phase behavior in binary compositions has also been studied by a range of additional techniques and in combinations including the polycarbonate of bisphenol-A. Regions of amorphous compatibility and incompatibility have been identified and measures made of transition temperature changes with composition. The conditions for transreaction have also been determined and the properties measured for the resultant new copolymers.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pen.760290110
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  • 6
    Electronic Resource
    Electronic Resource
    Vinyl polymerization by metal complexes, 11Part 10, cf.1.. Formation of polyvinylamine-copper(II) chelatesDedicated to Professor Dr. ICHIRO SAKURADA on his 70th birthday (1974)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 175 (1974), S. 83-93 
    Details
    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: Um den Mechanismus der Katalyse der Polyvinylamin-Kupfer(II)-Chelate bei der Auslösung der Vinylpolymerisation zu klären, wurden die Stabilitätskonstanten dieser Chelate durch Anwendung einer modifizierten BJERRUMschen Methode gemessen, und die Konzentration der chemischen Spezies wurde auf Grund der Chelattheorie abgeschätzt. Anhand dieser Ergebnisse wurde die Aktivität der Polyvinylamin-Kupfer(II)-Chelate bei der Polymerisation von Acrylnitril und von Methylmethacrylat bei verschiedenen pH-Werten diskutiert.
    Notes: In order to clarify the mechanism of catalysis of polyvinylamine-copper(II) chelates on the initiation of vinyl polymerizations, stability constants of these chelates were measured by applying a modification of BJERRUM'S method, and each concentration of the chemical species was estimated on the basis of the chelate theory. From these results, the activity of the polyvinylamine-copper(II) chelates for the polymerization of acrylonitrile and methyl methacrylate at different pH values was discussed.
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1974.021750110
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  • 7
    Electronic Resource
    Electronic Resource
    Use of pyridine bases as shift solvents for the analysis of novolak resin by NMR spectroscopy (1974)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 175 (1974), S. 1001-1005 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1974.021750326
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  • 8
    Electronic Resource
    Electronic Resource
    Reactivity of N-alkylated cyclic iminoether salts having vinyl groups, 2Part 1: cf.9. Polymerization and copolymerization of 2-isopropenyl-3-methyl-2-oxazolinium salts (1986)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 187 (1986), S. 1807-1817 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: 3-Methyl-2-isopropenyl-2-oxazolinium salts (4a, b) were prepared by alkylation of 2-isopropenyl-2-oxazoline (2). Their preparation is much easier than that of their vinyl analogues, 3-methyl-2-vinyl-2-oxazolinium salts, which cannot be isolated due to their high tendency to polymerization. 4a, however, was found, to show a low tendency toward radical and anionic polymerization, but it can be smoothly radically copolymerized with some vinyl monomers. The copolymerization parameters of 4a were determined and discussed in comparison with those of 2.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1986.021870801
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  • 9
    Electronic Resource
    Electronic Resource
    13C NMR study of O-(2-hydroxypropyl)cellulose (1985)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 186 (1985), S. 61-70 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The proton-decoupled signal of methyl carbons of O-(2-hydroxypropyl)cellulose (HPC) (1b, m ≥ 1) was found to be split into two peaks. The results of experiments on lanthanide shift and the dependence of the relative intensities of both peaks on the molecular weight of poly(oxypropylene) [poly(propylene oxide)] (PPO) indicated that the low-field peak results from the terminal hydroxypropyl groups and the high-field peak from the inside oxypropylene units. From the ratio between the intensities of the two peaks and the molar substitution (MS) (average number of oxypropylene units per anhydroglucose (AHG) unit), the degree of substitution (DS) (average number of hydroxyl groups substituted per AHG unit) was calculated. This new method could be applied to samples of low-MS to which the conventional method based on the 1H NMR technique alone was inapplicable. From the analysis of 13C NMR spectra of HPC samples differing in MS, an authentic structural picuture of the HPC molecule could be proposed.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1985.021860107
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  • 10
    Electronic Resource
    Electronic Resource
    Characteristics of rectifying devices with thin films of polyphthalocyanine (1989)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 190 (1989), S. 2693-2701 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Chemically and thermally stable thin films of polyphthalocyanine were prepared by a simple evaporation-polymerization method. The rectifying characteristics of metal/semiconductor/metal (MSM) type sandwich devices with the film were studied. A Schottky type device metal (Cu, Al, Ti)/polyphthalocyanine/Cu shows reproducible rectifying characteristics when Ti is selected as a counter electrode. The reproducibility is improved by pre-oxidation treatment of the surface of Cu substrate. Best electric parameters for the device are as follows: rectifying ratio = 14; threshold potential difference = 0,61 V; saturation current = 2,5 · 10-6 A · cm-2; barrier height = 0,75 eV; diode ideality parameter = 4,23. Doping of five kinds of quinones [p-benzoquinone (p-BQ), tetrabromo-p-benzoquinone (p-TBBQ) tetrachloro-p-benzoquinone (p-TCBQ) tetrachloro-o-benzoquinone (o-TCBQ) 2,3-dichloro-5,6-dicyanobenzoquinone (DDQ)] and 2,5-cyclohexadien-1,4-diylidenedimalodinitrile (TNCR) in thin films of polyphthalocyanine affected electrocharacteristics in some cases. The diode ideality parameter decreases to 2,17 at 0,90 · 10-6 mol · cm-1 of p-TBBQ, and the rectifying ratio increases to about fourteen times by doping p-TBBQ and p-TCBQ. The doped device shows a rectifying response up to 1 kHz.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1989.021901103
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