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  • Physics  (21)
  • Theoretical, Physical and Computational Chemistry  (7)
  • Ethanol  (6)
  • 1
    Digitale Medien
    Digitale Medien
    Instrumental analysis of ethanol-induced intoxication in human males (1986)
    Springer
    Psychopharmacology 89 (1986), S. 8-13 
    Details
    ISSN: 1432-2072
    Schlagwort(e): Ethanol ; Blood ethanol concentration ; Instrumental response ; Verbal behavior ; Time-effect relations ; Human subjects
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Abstract A study was conducted to assess subjective reports of intoxication during the ascending phase of the plasma ethanol curve. Eighteen male social drinkers were divided into three groups and were given either placebo, 0.347 g/kg ethanol or 0.694 g/kg ethanol under double-blind conditions. Subjects reported levels of intoxication both instrumentally, by moving a joystick device, and verbally using an 11-point self-rating scale. Compared to placebo, ethanol produced significantly higher verbal self-rating scores, but there were no differences in the scores between the low-and high-dose ethanol groups. Instrumental responses of ethanol effects did, however, distinguish between the two ethanol treatments. All subjects who received ethanol reliably detected its effects when plasma ethanol levels reached 32 mg/dl, but only the subjects who received the high dose reported episodes of intense well-being or euphoria. Ethanol-induced euphoria occurred while plasma ethanol levels were rapidly rising, and was characterized by multiple, paroxysmal episodes that typically lasted about 3 min each. This study demonstrated that a continuously available instrumental response provided sensitive and reliable measures of rapidly changing behavioral states associated with ethanol-induced intoxication.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00175181
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  • 2
    Digitale Medien
    Digitale Medien
    Factors governing the vulnerability of DRL operant performance to the effects of ethanol (1973)
    Springer
    Psychopharmacology 28 (1973), S. 351-362 
    Details
    ISSN: 1432-2072
    Schlagwort(e): Ethanol ; Operant Performance ; Dose-Response Analysis
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Abstract The effects of various doses of ethanol on DRL performance was examined in rats under conditions of cued and non-cued DRL tasks and under conditions of low versus high baseline performance criteria. The dose-level at which ethanol produced a significant reduction in number of responses and reinforcements interacted in a complex fashion with level of baseline performance, the cue conditions, and the order of DRL tasks. Generally, performance was impaired at a lower dose level for groups initially trained to a low criterion of DRL performance than for groups later trained to a higher criterion of DRL performance, regardless of cue condition. Further, the dose level at which ethanol impaired performance (as indicated by number of reinforcements obtained) under non-cued DRL conditions was lower than that for the cued DRL conditions, but only on the initial task where baseline DRL performance criterion was lower. Finally, the group with a higher baseline level of responding (i.e., poorer DRL performance) was more vulnerable to the disrupting effects of ethanol on this measure than groups with lower baseline response rates.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00422755
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  • 3
    Digitale Medien
    Digitale Medien
    An evaluation of the selectivity of fenmetozole (DH-524) reversal of ethanol-induced changes in central nervous system function (1980)
    Springer
    Psychopharmacology 69 (1980), S. 149-155 
    Details
    ISSN: 1432-2072
    Schlagwort(e): Fenmetozole ; Ethanol ; Aerial righting reflex ; Conflict behavior ; Guanosine 3′,5′-monophosphate ; Physical dependence ; Physiological antagonism
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Abstract The selectivity and specificity of fenmetozole (DH-524) [2(3,4-dichlorophenoxy-methy))2-imidazole HCl] as an antagonist of the actions of ethanol were examined. Fenmetozole (15–30 g/kg) reduced ethanol-induced impairment of the aerial righting reflex without changing blood or brain ethanol content, indicating that the antagonistic actions of fenmetozole were not due to change in the pharmacokinetics of ethanol. Since fenmetozole also reduced aerial righting reflex impairment due to phenobarbital, chlordiazepoxide, and halothane, this action of fenmetozole was not specific to ethanol. In mice, both the ethanolinduced increase in locomotor activity at 2.0 g/kg and the decrease caused by 4.0 g/kg were antagonized by fenmetozole. In addition, fenmetozole attenuated the ethanol-induced reduction in cerebellar cyclic guanosine monophosphate (cGMP) content, but the drug also significantly elevated cGMP levels in this tissue when given alone. Fenmetozole did not alter ethanolinduced increases in punished drinking in a conflict test, except at a high dose which alone decreased both punished and unpunished responding. Fenmetozole also failed to precipitate ethanol withdrawal-like reactions when given to physically-dependent, intoxicated rats. Thus, the antagonistic action of fenmetozole against ethanol would not seem to be related to a specific receptor interaction but rather may be the result of a physiological antagonism.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00427641
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  • 4
    Digitale Medien
    Digitale Medien
    Rapid establishment of ethanol as a reinforcer for rats (1974)
    Springer
    Psychopharmacology 37 (1974), S. 311-321 
    Details
    ISSN: 1432-2072
    Schlagwort(e): Rats ; Ethanol ; Ethanol Reinforcement ; Acquisition ; Schedule-Induced-Polydipsia ; Ethanol Concentration
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Abstract Daily 6-h sessions were run during which each lever press by rats produced brief access to water, or to 8
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00428917
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  • 5
    Digitale Medien
    Digitale Medien
    Ethanol as a reinforcer for rats: Effects of concurrent access to water and alternate positions of water and ethanol (1975)
    Springer
    Psychopharmacology 43 (1975), S. 19-23 
    Details
    ISSN: 1432-2072
    Schlagwort(e): Ethanol ; Ethanol Drinking ; Water-Ethanol Choice ; Concurrent Schedules ; Ethanol Concentration ; Ethanol Reinforcement ; Rats
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Abstract Water and ethanol solutions were concurrently made available on a continuous reinforcement schedule to 4 food-deprived male albino rats during daily 1-hr sessions in an operant conditioning chamber equipped with 2 levers and 2 liquid dippers. The number of ethanol reinforcements substantially exceeded the number of water reinforcements for each rat at each concentration studied (8, 16, and 32% w/v). Water reinforcements were low in number and did not vary with ethanol concentration. As the ethanol concentration was increased, the number of ethanol reinforcements obtained decreased, while the quantity consumed (mg/100 g of body weight/hr) increased. The highest rate of responding occurred at the beginning of the session.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00437609
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  • 6
    Digitale Medien
    Digitale Medien
    Glucose Transporters and Glucose Utilization in Rat Brain after Acute Ethanol Administration (2000)
    Springer
    Metabolic brain disease 15 (2000), S. 211-222 
    Details
    ISSN: 1573-7365
    Schlagwort(e): Ethanol ; GLUT1 ; GLUT3 ; Glucose ; Cerebral Metabolism ; Immunohistochemistry
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Abstract In the normal adult brain, glucose provides 90% of the energy requirements as well as substrate for nucleic acid and lipid synthesis. In the present study, effects of ethanol on glucose transporters (GLUT) and glucose utilization were examined in rat brain. Male Sprague-Dawley rats weighing 250-300 gms were given either ethanol 3 gm/kg BW or saline IP 4 hrs prior to the animal sacrifice and removal of the cerebral cortical tissue. The cortical plasma membranes analyzed by cytochalasin B binding assay showed a decrease in GLUT number but not in GLUT affinity in the ethanol treated rats as compared to the control rats. The estimated Ro values were 70 ± 8.9 Vs 91 ± 8.9 pmoles/mg protein (p 〈 0.05 N=4) and the estimated Kd values were 0.37 ± 0.03 and 0.28 ± 0.05 μM (p: NS) in ethanol and control experiments respectively. Immunoblots of purified cerebral plasma membranes and low density microsomal fraction showed 17% and 71% decrease for GLUT1 and 54% and 21% (p〈0.05 or less; n=6) for GLUT3 respectively in ethanol treated rats than in control animals. Immunofluoresence studies also showed reduction of GLUT1 immunoreactively in choroid plexus and cortical microvessels of ethanol treated rats as compared to control rats. The effect of ethanol on regional cerebral metabolic rates for glucose (CMRGle) was studied using [6-14C] glucose and showed statistically insignificant decrease in brain glucose utilization. These data suggest that ethanol invivo decrease GLUT number and protein content in rat cerebral cortex
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1023/A:1011115809810
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  • 7
    Digitale Medien
    Digitale Medien
    Glass transition in partially sulfonated polystyrene (1971)
    New York : Wiley-Blackwell
    Journal of Polymer Science Part A-2: Polymer Physics 9 (1971), S. 1325-1332 
    Details
    ISSN: 0449-2978
    Schlagwort(e): Physics ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie , Physik
    Notizen: The glass transition temperature Tg of partially sulfonated polystyrene has been measured dilatometrically as a function of degree of sulfonation. A semitheoretical relationship between Tg and degree of sulfonation has been derived by treating the strong-acid polymer as a highly polar copolymer of styrene and styrenesulfonic acid. The Tg of copolymer has been found to increase linearly up to 0.15 weight fraction of styrene-sulfonic acid wA as given by: \documentclass{article}\pagestyle{empty}\begin{document}$ T_g = T_{gB} + 200w_A $\end{document} where TgB is the glass transition temperature of loosely crosslined (1%) polystyrene matrix. Our experimental results agree well with theoretical relations developed on the basis of the iso-free-volume state of glass transition applied to sulfonated polystyrene. The marked linear increase in copolymer Tg with the styrenesulfonic acid is accounted for by the effect of progressively higher intermolecular forces due to the highly polar sulfonic acid substituents.
    Zusätzliches Material: 2 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/pol.1971.160090711
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  • 8
    Digitale Medien
    Digitale Medien
    Oriented γ-isotactic polypropylene crystallized at atmospheric pressure (1998)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part B: Polymer Physics 36 (1998), S. 2821-2827 
    Details
    ISSN: 0887-6266
    Schlagwort(e): polypropylene ; composites ; gamma phase ; epitaxy ; X-ray scattering ; Physics ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie , Physik
    Notizen: A method for crystallizing oriented samples of the γ-phase of isotactic polypropylene (iPP) under atmospheric pressure in the presence of nucleating fibers has been developed. The technique uses iPP grades of high molecular weight and high isotacticity and produces a mixture of α and γ-phase crystals within the matrix of both pitch-based carbon and Kevlar®-reinforced composites. Two-dimensional wide-angle X-ray scattering (WAXS) patterns from these samples show that the content of the γ-phase decreases as the fiber loading in the composites decreases, suggesting that the γ-phase is directly nucleated by the fibers. © 1998 John Wiley & Sons, Inc. J Polym Sci B: Polym Phys 36: 2821-2827, 1998
    Zusätzliches Material: 6 Ill.
    Materialart: Digitale Medien
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  • 9
    Digitale Medien
    Digitale Medien
    Chain conformation of rod-like polymers in the melt: Small-angle neutron scattering of poly(benzoyl paraphenylene) (1998)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part B: Polymer Physics 36 (1998), S. 2449-2459 
    Details
    ISSN: 0887-6266
    Schlagwort(e): small-angle neutron scattering ; rigid-rod polymer ; thorny-rod polymer ; self-reinforcing polymer ; chain conformation ; persistence length ; Physics ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie , Physik
    Notizen: The chain conformation of a rigid rod polymer, poly(benzoyl paraphenylene), is determined in the melt using small-angle neutron scattering. The coherent scattering cross-section from blends of partially deuterated and hydrogenous poly(benzoyl paraphenylene) agree well with ideal rod scattering for q 〉 0.02 Å-1, indicating that the polymer chains are highly extended. Comparison of the results to a single chain-scattering function for chains of arbitrary stiffness yield a persistence length of ca. 130 Å. Pure component scattering at the lowest scattering lengths indicate that the melt is not molecularly homogenous, but is comprised of domains, potentially reflecting localized groupings of chains with similar backbone orientation. Furthermore, this mesoscopic structure depends on the processing history of the polymer in the melt state. © 1998 John Wiley & Sons, Inc. J. Polym. Sci. B Polym. Phys. 36: 2449-2459, 1998
    Zusätzliches Material: 8 Ill.
    Materialart: Digitale Medien
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  • 10
    Digitale Medien
    Digitale Medien
    Relaxations of confined chains in polymer nanocomposites: Glass transition properties of poly(ethylene oxide) intercalated in montmorillonite (1997)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part B: Polymer Physics 35 (1997), S. 59-67 
    Details
    ISSN: 0887-6266
    Schlagwort(e): nanocomposites ; glass transition ; confined chains ; intercalation ; Physics ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie , Physik
    Notizen: The relaxation behavior of poly(ethylene oxide) (PEO), intercalated in montmorillonite, a naturally occurring mica-type silicate, was studied by differential scanning calorimetry (DSC) and thermally stimulated dielectric depolarization (or thermally stimulated current, TSC). The materials were synthesized by melt or solution-mediated intercalation. In both intercalates, the PEO chains were confined to ca. 0.8-nm galleries between the silicate layers. The solution intercalate contained a fraction of unintercalated PEO chains which exhibited a weak and depressed PEO melting endotherm in DSC. In contrast, the melt intercalate was “starved” such that almost all the PEO chains were effectively intercalated. For these melt intercalates, no thermal events were detected by DSC. TSC thermal sampling technique was used to examine the glass transition regions and to estimate the extent of cooperativity of chain motions. The motions of the intercalated PEO chains are inherently noncooperative relative to the cooperative Tg motions in the amorphous portion of the bulk polymer. This is presumably due to the strong confining effect of the silicate layers on the relaxations of the intercalated polymer. © 1997 John Wiley & Sons, Inc.
    Zusätzliches Material: 8 Ill.
    Materialart: Digitale Medien
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