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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Psychopharmacology 50 (1976), S. 55-60 
    ISSN: 1432-2072
    Keywords: 6-Hydroxydopamine ; Operant behaviour ; Noradrenaline ; Tyrosine hydroxylase
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Newborn rats were treated at 1 and 2 days after birth with 100 mg/kg 6-hydroxydopamine (6OHDA), s.c. Testing on several operant behavioural tasks was begun at 6 months of age. On a fixed ratio 30 (FR 30) schedule of food reinforcement, the neonatal 6OHDA treated rats responded at a significantly higher rate. Further analysis of the FR 30 response pattern indicated that the higher rate was due to a decrease in the amount of time spent pausing after the receipt of each reinforcer. The 6OHDA treatment failed to alter the rat's behaviour during the extinction of the FR 30 response and on the progressive ratio or variable interval schedules of food reinforcement. Biochemical analysis of several brain areas at 9 months of age showed a decrease in noradrenaline (NA) levels in the cerebral cortex and hippocampus, while in the pons-medulla NA, content was doubled. The tyrosine hydroxylase activity in these same brain areas was not significantly altered, but there appeared to be some decrease in the activity of this enzyme in the hippocampus. Comparison of the operant behavioural effects seen after various lesioning procedures in this and other studies, suggest the effects on FR performance are a result of destruction of NA neurons in the hippocampus and/or the apparent regeneration of neurons in the pons-medulla.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1572-9591
    Keywords: Cold fusion ; Pd-D2O cells ; Ti-D2 systems ; barrier penetration calculations
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract We have searched for cold fusion produced in an electrolytic cell with Pd cathode and Pt anode. The electrolyte was 0.1 molar LiOD in 99.8% D2O. A 2-mm rod of polycrystalline Pd and a 4-mm rod of single crystal Pd were used. No radiation was detected above background by a BF3 neutron and Ge γ-X detector. The D2 loading of the Pd was 0.8 D per Pd atom reaching saturation after 4 hours. We also attempted to duplicate the work of Scaramuzzi and co-workers on the Ti-D2 system. Both powder and pieces of Ti were used. The material was cycled several times between 1100 K and 77 K. No neutron, γ- or x-ray emission above background was observed. The results of a barrier penetration calculation for H-like atoms are presented. The high fusion rates reported for PdD x . are much larger than those expected from theoretical calculations on these systems.
    Type of Medium: Electronic Resource
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