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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Psychopharmacology 34 (1974), S. 71-80 
    ISSN: 1432-2072
    Keywords: Apomorphine ; Dopaminergic System ; Reinforcement ; Self-Stimulation ; Stereotyped Behavior
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Self-stimulation behavior was studied in untreated rats and rats injected with apomorphine with electrodes implanted in the nucleus accumbens, the lateral hypothalamus, the catecholaminergic cell-groups A9–A10 and the locus coeruleus. Apomorphine (0.2 mg/kg s. c.) consistently facilitated self-stimulation in a number of rats but inhibited this behavior in others. This individual variation could be observed in all four groups of rats but was further analysed in the rats with an electrode in the A9–A10 area. The effect of the drug was highly reproducible for individual animals. Extinction after reduction of the rewarding current to zero could not be demonstrated as long as the drug was active. These results substantiate the hypothesis that apomorphine is able to replace the reinforcing action of intracranial rewarding stimulation.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Psychopharmacology 25 (1972), S. 162-168 
    ISSN: 1432-2072
    Keywords: Noradrenaline ; Clonidine ; Adrenergic Imidazolines ; Central Noradrenaline Receptors ; Intracerebral Injections ; Hypothalamic Eating System
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Intracerebral injection of 1 Μl volumes of solutions containing noradrenaline, clonidine, oxymetazoline and phentolamine were performed in the antero-lateral hypothalamus of the Wistar rat at the level of the pars infracommissuralis of the Stria terminalis. Intrahypothalamic clonidine in a dose as low as 1 Μg strongly increased food intake in satiated rats. Clonidine (4 Μg) was more potent than noradrenaline (12 Μg) but as potent as oxymetazoline (1.5 Μg). The clonidine induced eating response was completely blocked by the α-sympatholytic drug phentolamine. The results emphasize the role of clonidine as an activator of noradrenaline receptors in the central nervous system.
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 1573-739X
    Keywords: Adverse effects ; Dementia ; Drug utilization ; Nursing homes ; Pharmacoepidemiology ; Psychotropic drugs
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The aim of this study was to describe the use of psychotropic drugs in a psychogeriatric nursing home, “Joachim en Anna”, in Nijmegen, the Netherlands. To this end the medical records of 890 nursing home patients with dementia, admitted between 1980 and 1989, were analysed retrospectively. Each time pattern of psychotropic drug use was registered. Drugs were coded by means of the Anatomical Therapeutic Chemical classification system. The daily dose was expressed as the ratio of the mean prescribed daily dose and the defined daily dose. Side-effects and changes in prescription patterns throughout the years patients were admitted were analysed. A total of 3,090 time patterns of exposure to psychotropics were registered. Neuroleptics, benzodiazepines, and antidepressants accounted for 58, 32, and 9% of the time patterns, respectively. For almost every drug prescription the prescribed daily dose was lower than the defined daily dose. More than 75% of these nursing home patients had at least one prescription for a psychotropic drug during institutionalization. One or more side-effects were observed in 50% of the patients who used a neuroleptic. The total number of patients receiving psychotropics did not change throughout the study. Psychotropics were prescribed for long-term use, but in a low dose. Side-effects were frequently observed while the correct individual dose was being determined.
    Type of Medium: Electronic Resource
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  • 4
    ISSN: 1573-8744
    Keywords: Michaelis-Menten kinetics ; nonlinear pharmacokinetics ; supply-limited elimination ; capacity-limited elimination ; estimation of parameters ; ethanol ; salicylic acid ; 4-hydroxybutyric acid ; phenytoin
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The pharmacokinetic behavior of foreign substances that are completely or partially eliminated via metabolism by saturable enzyme systems is analyzed. General integrated equations are derived which describe the time course of the plasma concentration under the assumption of a saturable enzyme system according to Michaelis-Menten kinetics in combination with normal firstorder elimination processes. A procedure for the estimation of initial values of the elementary kinetic parameters on the basis of the models is outlined. These initial values have been used in a nonlinear curvefitting program in order to obtain reliable kinetic and enzyme parameters from the plasma curves. With these methods, kinetic and apparent enzyme parameters are calculated for ethanol, salicylic acid, 4-hydroxybutyric acid, and phenytoin.
    Type of Medium: Electronic Resource
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