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  • Polymer and Materials Science  (18)
  • Hypothalamic stimulation  (2)
  • Arterial smooth muscle cells  (1)
  • Blattidae  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Age differences in the proliferative response of cultured arterial smooth muscle cells induced by sera of hypothalamically-stimulated rats
    Amsterdam : Elsevier
    Mechanisms of Ageing and Development 57 (1991), S. 205-212 
    Details
    ISSN: 0047-6374
    Keywords: Ageing ; Arterial smooth muscle proliferation ; Atherosclerosis ; Hypothalamic stimulation
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Medicine
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0047-6374(91)90047-4
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  • 2
    Electronic Resource
    Electronic Resource
    Growth retardation in senescent arterial smooth muscle cells and its reversal following brain stimulation: Implications for atherogenesis
    Amsterdam : Elsevier
    Mechanisms of Ageing and Development 60 (1991), S. 89-98 
    Details
    ISSN: 0047-6374
    Keywords: Arterial smooth muscle cells ; Growth retardation ; Hypothalamic stimulation
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Medicine
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0047-6374(91)90112-D
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  • 3
    Electronic Resource
    Electronic Resource
    Electroantennogram responses of synthetic periplanone-A and periplanone-B in the american cockroach (1992)
    Springer
    Journal of chemical ecology 18 (1992), S. 371-378 
    Details
    ISSN: 1573-1561
    Keywords: American cockroach ; Periplaneta americana ; sex pheromone ; EAG response ; periplanone-A ; periplanone-B ; Orthoptera ; Blattidae
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract The electroantennogram responses of synthetic (−)-periplanone-B (PB) and (−)-periplanone-A (PA) were evaluated by using the antennae of the unmated male American cockroachPeriplaneta americana L. The threshold concentrations of the pheromone activities for the two chemicals were similar. Neither a synergistic nor an inhibitory response was noted, and only an additive effect was detected when PA and PB were applied as a mixture.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00994238
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  • 4
    Electronic Resource
    Electronic Resource
    Evidence of two relaxation processes in the photon correlation spectra of poly(methyl methacrylate) above Tg (1986)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part B: Polymer Physics 24 (1986), S. 1859-1867 
    Details
    ISSN: 0887-6266
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Photon correlation functions of a high-molecular-weight PMMA (Mw = 1.06 × 107, Mn = 2.2 × 106, Tg = 103°C) have been studied in the temperature range 98 - 149°C. In contrast to previous results, two relaxation modes are observed in relaxation functions. The observed relaxation functions of PMMA are analyzed for the first time in terms of a continuous spectrum representing the distribution of retardation times. Using a modified computer program originally developed by Provencher, we have computed the spectrum of retardation times at various temperatures. The appearance of two distinct relaxation modes is clearly evident in the distribution of the retardation times and in the time correlation functions below 123°C.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/polb.1986.090240820
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  • 5
    Electronic Resource
    Electronic Resource
    Mass diffusion of camphorquinone in poly(methyl methacrylate) hosts with different molecular weights (1990)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part B: Polymer Physics 28 (1990), S. 963-971 
    Details
    ISSN: 0887-6266
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Diffusion coefficients of camphorquinone (CQ) and its photoproduct (CQP) in two poly(methyl metbacrylate) (PMMA) samples with different molecular weights are measured as a function of temperature. Above the glass transition, the temperature dependence is not Arrhenius and can be described by the Williams-Landel-Ferry equation. It is also shown that the difference in the temperature dependence of the diffusion coefficients of CQ in the two PMMA samples is attributable to the difference in glass transition temperatures.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/polb.1990.090280612
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  • 6
    Electronic Resource
    Electronic Resource
    Investigation of dipolar reorientation dynamics of pure bulk polymers using second harmonic generation (1994)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part B: Polymer Physics 32 (1994), S. 2615-2624 
    Details
    ISSN: 0887-6266
    Keywords: second harmonic generation ; correlated dipolar orientation ; trapped charges ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Second harmonic generation (SHG) in three corona-poled, pure, bulk polymers is studied as a function of temperature. It is found that this technique readily yields dynamical information that is complementary to that obtained from the technique of dielectric relaxation (DR). The SHG results are compared to those from DR in the same temperature ranges above Tg. It is found that in the temperature ranges examined, the relaxation times obtained from SHG are several orders fo magnitude longer than those measured by dielectric relaxation. This is explained as being due to the strong correlation between oriented dipoles and to trapped charges injected by the poling process. Fitting measured data to the Williams-Landau-Ferry (WLF) equation indicates that more free volume is needed in SHG for dipolar reorientation than is needed in DR. An SHG relaxation elongation phenomenon at constant temperature is found to occur in the pure bulk polymers and is similar to that found in chromophore-doped polymers previously studied. The SHG technique is developed as a new tool to directly study the reorientational dynamics of polar polymer segments. © 1994 John Wiley & Sons, Inc.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/polb.1994.090321607
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  • 7
    Electronic Resource
    Electronic Resource
    Holographic grating relaxation studies of probe diffusion in amorphous polymers (1995)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part B: Polymer Physics 33 (1995), S. 899-908 
    Details
    ISSN: 0887-6266
    Keywords: probe diffusion ; holographic grating relaxation ; temperature dependence ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Probe diffusion of camphorquinone, thymoquinone, and diacetyl in polymers was studied by the laser-induced holographic grating relaxation (HGR) technique in polymers. The effects of changing the probe size and various parameters of the polymer, such as the molecular weight, chain conformation, and the glass transition temperature, on the probe diffusion coefficient have been investigated. Furthermore, effects of cross-linking and plasticizing the chains of the polymer host on the probe diffusion coefficient were also studied. Temperature-dependent studies show that except for the very low molecular weight poly(methyl methacrylate), all probe diffusion coefficient data above the glass transition temperature fit well to the WLF equation. ©1995 John Wiley & Sons, Inc.
    Additional Material: 10 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/polb.1995.090330605
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  • 8
    Electronic Resource
    Electronic Resource
    An experimental study of dilute polyelectrolyte solutions in strong flows (1987)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part B: Polymer Physics 25 (1987), S. 2211-2238 
    Details
    ISSN: 0887-6266
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Flow-induced changes in the conformation of polymer molecules in dilute polyelectrolyte solutions were studied, using birefringence techniques, as a function of molecular weight and added salt concentration in laminar, two-dimensional extensional flows produced in four- and two-roll mills. Overshoots in the flow birefringence during startup of simple-shear flow are presented. Of particular interest is the so-called coil-stretch transition. It is shown that the electrostatic expansion of the polyelectrolyte has a dramatic effect on the onset shear rate for the coil-stretch transition and also on the shape of the flow birefringence versus shear rate curves during the stretching process. A reasonable description of the coil-stretch transition and its dependence on equilibrium configuration is obtained theoretically using a charged dumbbell model with conformation-dependent bead friction. Being dependent on the longest relaxation time of the polymer, and therefore not too sensitive to intramolecular details, the dumbbell model can be applied in two ways: either using a charge force to expand its rest state or reducing N, the number of Kuhn segments, in proportion to the increase in relaxation time of the expanded polyelectrolyte.
    Additional Material: 13 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/polb.1987.090251101
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  • 9
    Electronic Resource
    Electronic Resource
    Diffusion of camphorquinone in uniaxially drawn polycarbonate films (1992)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part B: Polymer Physics 30 (1992), S. 1437-1442 
    Details
    ISSN: 0887-6266
    Keywords: polycarbonate ; orientation ; anisotropic diffusion ; stretched film ; strain rate ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Employing the laser-induced holographic grating relaxation technique, we have measured tracer diffusion coefficients of a phtochromous dye, camphorquinone, in uniaxially drawn polycarbonate films as a function of stretch ratio. Anisotropy in the tracer diffusion coefficient has been observed with D∥ greater than D⊥ by at least a factor of 4 for the film stretched to the stretch ratio δ = 2.3. The diffusion coefficient along the direction of stretch D∥ increases significantly with increasing δ, whereas D⊥ decreases slightly with increasing δ. The stretch ratio dependence of D∥ and D⊥ is interpreted according to a modified free volume theory. The strain rate and stretch temperature dependence of the anisotropic tracer diffusion coefficient has also been investigated. © 1992 John Wiley & Sons, Inc.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/polb.1992.090301302
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  • 10
    Electronic Resource
    Electronic Resource
    Physical aging and dye diffusion in polysulfone below the glass transition temperature (1994)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part B: Polymer Physics 32 (1994), S. 569-572 
    Details
    ISSN: 0887-6266
    Keywords: physical aging ; tracer diffusion coefficient ; camphorquinone ; polysulfone ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The effect of physical aging on the tracer diffusion coefficient D of camphorquinone in polysulfone is investigated. It is shown that if the sample is sufficiently annealed and physical aging is nearly complete, the temperature dependence of D will reflect the primary α-relaxation process of the host polymer. In the temperature range between Tg (=185°C) and 165°C, D is found to be a function of time, and the time dependence of D is given by D = At-μ, with μ approximately equal to unity. © 1994 John Wiley & Sons, Inc.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/polb.1994.090320318
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