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  • Articles: DFG German National Licenses  (7)
  • 1985-1989  (5)
  • 1980-1984  (2)
  • Polymer and Materials Science  (7)
  • 1
    Electronic Resource
    Electronic Resource
    Kinetics of ethidium's intercalation in packaged bacteriophage T7 DNA: Effects of DNA packing density (1986)
    New York : Wiley-Blackwell
    Biopolymers 25 (1986), S. 1345-1357 
    Details
    ISSN: 0006-3525
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The kinetics of ethidium's intercalative binding to DNA packaged in bacteriophage T7 and two T7 deletion mutants have been determined, using enhancement of fluorescence to quantitate binding. At a constant ethidium concentration, the results can be described as first-order binding with two different rate constants, k1* (= k1 + k-1) and k2* (= k2 + k-2). The larger rate constant (k1*) was at least four orders of magnitude smaller than the comparable first-order forward rate constant for binding to DNA released from its capsid. At 25°C values of k1* decreased as the amount of DNA packaged per internal volume increased. This latter observation indicates that the rate of ethidium's binding to packaged T7 DNA is limited by an event that occurs inside of the DNA-containing region of T7, not by the crossing of T7 capsid's outer shell. Arrhenius plots of kM1* are biphasic, indicating a transition for packaged DNA at a temperature of 20°C. The data indicate that k1* s are limited by either sieving of ethidium during its passage through the packaged DNA or subsequent hindered intercalation.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bip.360250713
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Polyphenylquinoxalines containing pendant phenylethynyl groups: Preliminary mechanical properties (1983)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 28 (1983), S. 355-366 
    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: Polyphenylquinoxalines (PPQ's) containing various amounts of crosslinkable pendant phenylethynyl groups were prepared from the reaction of 3,3′,4,4′-tetraaminodiphenyl ether, 4,4′-oxydibenzil, and 4,4′-oxybis(4″-phenylethynylbenzil). The distribution of the pendant phenylethynyl groups along the polymer chain was varied in an attempt to alter the properties of the polymers. Preliminary film, adhesive, and laminate properties of PPQ void of pendant crosslinkable groups and containing pendant phenylethynyl groups were determined. The thermally induced reaction of the phenylethynyl group crosslinked the polymer which resulted in better dimensional stability at elevated temperatures.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1983.070280131
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Binding of ethidium to bacteriophage T7 and T7 deletion mutants (1985)
    New York : Wiley-Blackwell
    Biopolymers 24 (1985), S. 1635-1646 
    Details
    ISSN: 0006-3525
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Equilibrium binding of ethidium, quantitated by fluorescence enhancement, to DNA packaged in bacteriophage T7 and T7 deletion mutants has been compared with the binding of this dye to DNA released from its capsid (free DNA). During achievement of apparent equilibrium binding, no change in bacteriophage T7 structure occurred, by the criterion of agarose gel electrophoresis. However, excessive incubation with ethidium bromide caused detectable changes in bacteriophage structure, a possible explanation of disagreements in similar studies previously performed with T-even bacteriophages. Scatchard plots for packaged DNA had a curvature greater than the previously demonstrated [Bresloff, J. L. & Crothers, D. M. (1981) Biochemistry 20, 3547-3553] curvature for free DNA. By treating plots for packaged DNA as though they were biphasic, it was found that binding to most sites occurred with an apparent association constant (Kap) 3.3-4.3 times lower than the Kap of free DNA. The number of these sites increased significantly as the density of packaged DNA was decreased by use of the deletion mutants. Values of ΔH° for these sites were negative and equal to the ΔH° for free DNA; values of ΔS° were positive and about half the ΔS° for free DNA. A second class of sites, roughly 1.2% of the total, had a significantly higher Kap and more negative ΔH° than those of the majority of sites.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bip.360240816
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Secondary structure of a core protein from pig skin proteodermatan sulfate: Cd and fourier transform ir spectroscopic studies in solution (1989)
    New York : Wiley-Blackwell
    Biopolymers 28 (1989), S. 1923-1933 
    Details
    ISSN: 0006-3525
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The secondary structure of a 38 kDa core protein from pig skin proteodermatan sulfate (PDS), was investigated in solution using CD and Fourier transform (FT) ir spectroscopy. Both techniques generally have provided complementary data on the secondary structures of proteins. CD spectral analysis has shown that the core protein contains 60% β-turn and α-helical structures, the rest being “unordered” structure. FT ir data do not permit calculation of quantitative contributions of substructures, at the present time, to the overall secondary structure of the core protein. CD spectrum of the intact PDS is similar to the core protein CD spectrum.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bip.360281109
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  • 5
    Electronic Resource
    Electronic Resource
    Eindeutige Aktivitätscharakterisierung technischer Katalysatoren im konzentrationsgesteuerten DifferentialkreislaufreaktorVortrag von D. Agar auf der Dechema-GVC-Sitzung „Heterogene Katalyse“ vom 24. bis 26. Febr. 1988 in Irsee. (1988)
    Weinheim : Wiley-Blackwell
    Chemie Ingenieur Technik - CIT 60 (1988), S. 712-713 
    Details
    ISSN: 0009-286X
    Keywords: Katalytische Aktivität ; Katalysatormasse ; Standardanlage ; Meßmethode ; SO2-Oxidation ; Differentialkreislaufreaktor ; Konzentrationssteuerung ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cite.330600917
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    Paper (German National Licenses)
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  • 6
    Electronic Resource
    Electronic Resource
    High performance thermoplasticsPaper presented at the meeting of the GDCh-Fachgruppe “Makromolekulare Chemie” on “New Polymers-special properties-modern technologies” in Bad Nauheim (W. Germany) on April 14/15 1986 (1986)
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 145 (1986), S. 323-341 
    Details
    ISSN: 0003-3146
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Thermoplastics are currently receiving considerable attention for potential use as structural resins in aerospace vehicles. These materials offer an attractive combination of chemical, physical and mechanical properties. Perhaps the most important advantage offered by the thermoplastics over the new toughened thermosets in composite applications is the potential of low cost manufacturing. However, many problems must be resolved with the thermoplastics before they find extensive use in aerospace composite applications. As part of an effort on improved thermoplastics for use as structural resins, NASA Langley Research Center has been intimately involved in research on polyimides, polyarylene ethers, and polyphenylquinoxalines. Several new semi-crystalline polyimides with high adhesive properties [e.g. Ti/Ti tensile shear strength @ 25°C of 54.1 MPa] and high fracture energies (GIc) [e.g. 6600 J/M2] are under evaluation. New polyarylene ethers offer glass transition temperatures ranging from 114 to 280°C, crystalline melt temperatures of 275 to 400°C, fracture energies (GIc) as high as 6300 J/M2, and good processability. Ethynyl groups were placed on the ends of arylene ether oligomers and subsequently cured to provide materials with excellent adhesive properties and solvent resistance. In the polyphenyl-quinoxaline family, various new homo, co and crosslink polymers display improved processability, good mechanical properties, and higher use temperature. The chemistry (structure/property relationships), mechanical and physical properties of these new thermoplastics are discussed herein.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/apmc.1986.051450116
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    Paper (German National Licenses)
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  • 7
    Electronic Resource
    Electronic Resource
    Polymerization kinetics of resin-based restorative materials (1983)
    Hoboken, NJ : Wiley-Blackwell
    Journal of Biomedical Materials Research 17 (1983), S. 275-282 
    Details
    ISSN: 0021-9304
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Medicine , Technology
    Notes: The kinetics and mechanism of cure of resin-based restorative materials have been investigated by incorporating into commercial materials additional amounts of inhibitor, initiator, and accelerator. The polymerization was monitored by IR spectroscopy, viscosity measurements, and an oscillating rheometer. The rate of initiation of the polymerization was found to be first order with respect to the initiator and accelerator concentration. The inhibitor was found to be responsible for the induction period during which no polymerization occurred. The duration of this period was proportional to the inhibitor concentration. It was also found that the efficiency of the inhibitor affected the difference between the initial and final set times so that with one particularly effective inhibitor a “snap-set” behavior could be obtained.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jbm.820170206
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    Paper (German National Licenses)
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