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  • 1
    Electronic Resource
    Electronic Resource
    Vitrification of water in a hydrogel (1988)
    s.l. : American Chemical Society
    Macromolecules 21 (1988), S. 1184-1186 
    Details
    ISSN: 1520-5835
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ma00182a059
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Insulin and vanadate restore decreased plasma endothelin concentrations and exaggerated vascular responses to normal in the streptozotocin diabetic rat (1998)
    Springer
    Diabetologia 41 (1998), S. 1233-1240 
    Details
    ISSN: 1432-0428
    Keywords: Keywords Aorta ; endothelin ; insulin ; streptozotocin diabetic rat ; vanadate.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Although insulin has been shown to raise plasma concentrations of endothelin (ET) and up regulate vascular smooth muscle ETA receptor expression, the interaction of vanadate, an insulinomimetic agent, with the vascular ET system has not been investigated. We compared the effects of oral vanadate treatment (0.5 mg/ml; p. o.) and insulin infusion (12 mU · kg–1· min–1 s. c.) for two weeks on plasma ET concentrations and vascular responses to endothelin-1 (ET-1) and the α-1 adrenoceptor agonist, methoxamine, in aortic ring preparations from streptozotocin (STZ) diabetic and non-diabetic adult male Sprague-Dawley rats. Plasma ET concentrations were lower (p 〈 0.01) in STZ diabetic rats compared with normal control rats. Insulin and vanadate treatment restored plasma ET to normal (p 〈 0.01) in STZ rats and increased ET concentrations in the control (p 〈 0.05) group. Higher maximal tension responses to both ET-1 (p 〈 0.01) and methoxamine (p 〈 0.05) were present in STZ rats in both endothelium intact and denuded aortic preparations compared with the control group. Both insulin and vanadate treatment returned these responses to normal. It is concluded that low plasma concentrations of insulin and high plasma glucose in STZ diabetic rats are accompanied by lower concentrations of plasma ET. Insulin and vanadate treatment restores diminished plasma ET to control concentrations and attenuates exaggerated agonist(s)-evoked vascular smooth muscle responses in STZ-induced diabetic rats. In addition to well known beneficial metabolic effects, insulin and vanadate may beneficially affect cardiovascular regulation in the STZ diabetic rat by correcting abnormal ET activity. [Diabetologia (1998) 41: 1233–1240]
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s001250051057
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Spiral crack propagation confined to a surface zone of a cross-linked polymer (1988)
    Springer
    Journal of materials science 7 (1988), S. 875-876 
    Details
    ISSN: 1573-4811
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00723791
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Influence of dibutyl phthalate on the mechanical, thermal, and relaxation behaviour of poly (methyl methacrylate) for denture-base soft liners (1993)
    Springer
    Journal of materials science 4 (1993), S. 509-514 
    Details
    ISSN: 1573-4838
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine , Technology
    Notes: Methyl methacrylate and six solutions of methyl methacrylate/dibutyl phthalate (nominally 5 to 30% v/v) were polymerized into thin sheets using gamma radiation. Dynamic mechanical spectra of the storage modulus, loss modulus and loss tangent, as well as changes in length, were investigated as a function of temperature. From these measurements, the depression of the storage modulus and glass-transition temperature were obtained. Subsequently, differential scanning calorimetry (DSC) and cross-polarization-magic-angle-spinning NMR were used to obtain additional glass-transition and relaxation-time measurements. Based upon these experiments, a specific form of the rule of mixtures described the depression of the glass-transition temperature. From storage-modulus measurements, antiplasticization was evidenced at very low temperatures and at compositions greater than 25% v/v. Solid-state NMR confirmed that plasticization causes an increase in polymer main-chain motion via the physical loosening of secondary bonds between polymer chains.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00120131
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    Effect of ionizing radiation on the dynamic mechanical properties of an epoxy and a graphite fiber/epoxy composite (1989)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part B: Polymer Physics 27 (1989), S. 1185-1185 
    Details
    ISSN: 0887-6266
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/polb.1989.090270518
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  • 6
    Electronic Resource
    Electronic Resource
    Multiple transitions in a dimethacrylate network (1990)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 40 (1990), S. 1195-1208 
    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: Triethylene glycol dimethacrylate, TEGDM, was cured to various dose levels (0.15-2.0 Mrad) by γ-irradiation at 40°C and its dynamic mechanical properties were evaluated. The resultant products had up to four transition phenomena dependent upon dose. The highest temperature transition (IV) was due to the ultimate glass transition. Transition III (ca. 40°C) was due to additional reaction occuring just above the cure temperature. Transition 1 (ca. -60°C) occurred at low doses and was associated with residual monomer. Transition II (ca. -10°C) is due to association of —(CH2CH2O)— units in TEGDM monomer, and the associated regions persist in the crosslinked polymer.
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1990.070400710
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    Paper (German National Licenses)
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  • 7
    Electronic Resource
    Electronic Resource
    Burst testing of condoms. I. Basic features of the force-deformation curve of latex-rubber condoms (1992)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Biomaterials 3 (1992), S. 117-122 
    Details
    ISSN: 1045-4861
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Medicine , Technology
    Notes: Inflation of a rubber condom involves biaxial deformation of the material which can be modeled by the use of an appropriate strain-energy function. Force versus deformation data for uniaxial extension of strips of condoms were used to determine the parameters for Ogden's form of a strain-energy function. These parameters were then used to fit experimentally obtained burst test data to a stress-strain equation formulated for inflation of condoms in a burst test. Experimental data on inflation of condoms agree well with theoretical curves verifying the applicability of the biaxial stress-strain equation to the particular strain-energy function on which it is based.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jab.770030207
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    Paper (German National Licenses)
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  • 8
    Electronic Resource
    Electronic Resource
    Effect of ionizing radiation on the dynamic mechanical properties of an epoxy and a graphite fiber/epoxy composite (1988)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part B: Polymer Physics 26 (1988), S. 2029-2042 
    Details
    ISSN: 0887-6266
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: TGDDM/DDS epoxy and T300/NARMCO 5208 composite specimens were exposed to 0.5 MeV electrons to dose levels up to 10,000 Mrad, and the effects of radiation on the mechanical properties were characterized using dynamic mechanical analysis (DMA). In nominally cured specimens there remain unreacted epoxide groups because the epoxy system vitrifies during the cure, preventing additional reaction. DMA shows that ionizing radiation continues the reactions of epoxide groups. Also, the ultimate glass transition is shown to decrease monotonically with radiation dose. The room temperature elastic modulus of the epoxy increases slightly with radiation, but at temperatures exceeding 100°C there is a slight decrease with radiation. There is a dynamic loss phenomena associated with the composites, not seen in the epoxy, that is thought to be due to the interphase region between the fiber and the matrix.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/polb.1988.090261002
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