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  • 1995-1999  (2)
  • 1975-1979  (2)
  • 1970-1974  (2)
  • 1905-1909
  • Human  (2)
  • Inorganic Chemistry  (2)
  • Physical Chemistry  (2)
  • 1
    Electronic Resource
    Electronic Resource
    Lorazepam impairs perceptual integration of visual forms: a central effect (1996)
    Springer
    Psychopharmacology 126 (1996), S. 260-270 
    Details
    ISSN: 1432-2072
    Keywords: Benzodiazepine ; Lorazepam ; Human ; Visual perception ; Oculomotor balance ; Integration processes ; Symmetry perception
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Previous studies have shown a lorazepam effect on visual perception. We tested whether this impairment resulted from a peripheral effect induced by benzodiazepines. A first experiment showed that a single dose of lorazepam induces an oculomotor imbalance without impairing visual acuity or accommodation. In a second experiment, we tested whether the impairment induced by lorazepam on visual perception still occurred in monocular vision. Subjects matched incomplete forms controlled on the spacing and alignment of their local contour elements. A reference object was first displayed and followed by two laterally displayed objects, a target and a distractor. The distractor was the mirror-reversed version of the target. Performance was impaired in the lorazepam group when the reference was an incomplete form with a spacing of 10.8' or 22.2' of arc. These results were not correlated with sedation. They confirm that lorazepam has a central deleterious effect on visual perception. A posthoc analysis also suggested that lorazepam-treated subjects used asymmetry in the stimuli as a compensatory strategy. This result is discussed in relation to previous hypotheses about the physiological mechanisms that determine the effects of lorazepam on visual perception.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02246456
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Effects of haloperidol and amisulpride on motor and cognitive skill learning in healthy volunteers (1997)
    Springer
    Psychopharmacology 131 (1997), S. 329-338 
    Details
    ISSN: 1432-2072
    Keywords: Key words Haloperidol ; Amisulpride ; Human ; Cognitive ; Motor ; Skill learning ; Memory
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract The effects of a typical neuroleptic, haloperidol (1 and 2 mg orally), of an atypical neuroleptic, amisulpride (50 and 100 mg) and of a placebo on motor and cognitive skill learning were assessed in 60 healthy volunteers using repeated testing on the Tower of Toronto puzzle. Subjects were asked to solve three blocks of eight trials and, at distance from drug administration, a fourth block. The puzzle was connected to a computer in order to obtain a precise timing of individual moves. Two components of cognitive skill learning were assessed, the ability to learn to solve the puzzle and the acquisition of a problem-solving routine. Subjective feelings of effort and automatisation of the task were assessed using a questionnaire. Like placebo-treated subjects, neuroleptic-treated subjects were able to acquire a motor skill, to learn to solve the puzzle and to acquire a routine. However, haloperidol 2 mg-treated subjects needed significantly more moves to solve the puzzle in blocks 3 and 4, some of them having routinised a non-optimal solution. A significant cognitive slowing was observed in the haloperidol 1mg group in block 4. The performance pattern and verbal reports suggested that haloperidol impaired the higher cognitive functions such as the ability to shift from one strategy to another and/or to assess one’s performance accurately, possibly leading to the development of compensatory strategies. The only deleterious amisulpride effect was a cognitive slowing in block 4, which was observed in the lower dose group.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002130050300
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Berichtigung (1973)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 106 (1973), S. 1054-1054 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19731060344
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Fast kinetic studies of chemical reactions using high-intensity pulse radiolysis reaction of hydrogen peroxide with pentavalent vanadium (1977)
    New York, NY : Wiley-Blackwell
    International Journal of Chemical Kinetics 9 (1977), S. 603-617 
    Details
    ISSN: 0538-8066
    Keywords: Chemistry ; Physical Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: High-intensity pulse radiolysis, using a Febetron, has made it possible to obtain in a few microseconds homogeneous H2O2 concentrations of about 10-4 to 10-3M without any other reactive radiolytical product. The kinetics of the reaction of this H2O2 with a solute have been studied as a function of time for periods ranging from tens of microseconds to tens of milliseconds.An analytical model of this method is presented and then compared with the results of experiments in which the H2O2 concentrations are measured. The rate constant for the peroxidation of pentavalent vanadium is determined to be k = (5.7 ± 0.5) × 103M-1 plusmn; s-1.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/kin.550090409
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  • 5
    Electronic Resource
    Electronic Resource
    Les Systèmes B2O3—MO—MS Boracites M—S (M = Mg, Mn, Fe, Cd) et Sodalites M—S (M = Co, Zn) (1970)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 375 (1970), S. 202-208 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: In the B2O3—MO—MS (M = Mg, Mn, Fe, Co, Zn, Cd) systems six ternary phases have been isolated, four of them having the structure of the cubic variety of the boracite, Mg3B7O13Cl, and two the structure of the sodalite, Na4(SiAlO4)3Cl. Some properties of the new phases have been investigated.
    Notes: In den B2O3—MO—MS (M = Mg, Mn, Fe, Co, Zn, Cd)-Systemen wurden sechs neue Phasen isoliert und untersucht; vier haben die Struktur der kubischen Form des Borazit, Mg3B7O13Cl, und zwei die Struktur des Sodalit, Na4(SiAlO4)3Cl.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19703750210
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  • 6
    Electronic Resource
    Electronic Resource
    Influences of ClH and BrH on the pyrolyses of neopentane and ethane at small extents of reactionThis paper summarizes a part of the dissertation submitted by J. Muller in partial fulfillment of the requirements for the degree of Docteur és-Sciences. The first results of this work were presented by J. Muller, F. Baronnet, and M. Niclause in C. R. Acad. Sci. Paris, 274C, 1772 (1972) and at the International Symposium on Gas Kinetics, Brussels, Belgium, August 27-31, 1973 (1977)
    New York, NY : Wiley-Blackwell
    International Journal of Chemical Kinetics 9 (1977), S. 425-449 
    Details
    ISSN: 0538-8066
    Keywords: Chemistry ; Physical Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: A symbolic mechanism “μH, YH” has been proposed to account for the homogeneous chain pyrolysis of an organic compound μH in the presence of a hydrogenated additive YH at small extents of reaction. An analysis of this mechanism leads to two limiting cases: the thermal decomposition of neopentane corresponds to the first one (A), that of ethane to the second one (B). Previous experimental work has shown that this mechanism seems to account for a number of experimental observations, especially the inhibition of alkane pyrolyses by alkenes.Experimental investigations were extended by examining the influences oftwo hydrogen halides (ClH and BrH) upon the pyrolyses of neopentane (at 480°C) and ethane (around 540°C). The experiments have been performed in a conventional static Pyrex apparatus and reaction products have been analyzed by gas-liquid chromatography.The study shows that ClH and BrH accelerate the pyrolysis of neopentane (into i-C4H8 + CH4). The experimental results are interpreted by reaction schemes which appear as examples of the mechanism “μH, YH” in the first limiting case (A). The proposed schemes enable one to understand why the accelerating influence of ClH is lower or higher than that of BrH, depending on the concentration of the additive. An evaluation of the rate constant of the elementary steps neo-C5H11 · → i-C4H8 + CH3 · is discussed.In the case of ethane pyrolysis, BrH inhibits the formation of the majorproducts (C2H4 + H2) and, even more, that of n-butane traces. The experimental results are interpreted by a reaction scheme which appears as an example of the mechanism “μH, YH” in the second limiting case (B). On the contrary, ClH has no noticeable influence on the reaction kinetics. This result inessentially due to the fact that the bond dissociation energy of Cl—H(⋍103 kcal/mol) is higher than that of C2H5 - H (⋍98 kcal/mol), whereas that of Br - H (⋍88 kcal/mol) is lower.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/kin.550090312
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    Paper (German National Licenses)
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