László Nagymajtényi

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BACKGROUND Manganese, an essential micronutrient, is a potential neurotoxicant in prolonged overexposure. Parkinson-like syndrome, motor deficit, disturbed psychomotor development are typical signs of neuropathological alterations due to Mn in humans. METHODS Young adult rats, in three groups of 16 each, received 15 and 59 mg/kg b.w. MnCl(2), (control:(More)
Neurophysiological changes caused by parallel treatment with inorganic lead and dimethoate (a combination of possible health risk at population level) were investigated in different phases of the ontogenesis. Wistar rats were treated by gavage with lead (80.0 or 320.0 mg/kg); with dimethoate (7.0 or 28.0 mg/kg), or with their combination on days 5-15 of(More)
Behavioural and electrophysiological changes caused by inorganic cadmium were investigated in the offspring of female Wistar rats. Dams were given 3.5, 7.0 or 14.0 mg kg(-1) cadmium (cadmium chloride dissolved in distilled water) in three different treatment regimes: days 5-15 of pregnancy; days 5-15 of pregnancy + 4 weeks of lactation; days 5-15 of(More)
The aim of this study was to investigate the effects of a combination of well-known neurotoxic heavy metals, lead and mercury, with ethanol. For 12 weeks, young adult male Wistar rats were given plain tap water or water containing 5% (v/v) ethanol to drink, and were treated with two doses of lead acetate or mercuric chloride by gavage. Accordingly, there(More)
In male Wistar rats, behavioral and electrophysiological investigations, and blood and brain manganese level determinations, were performed; during 10 weeks treatment with low-dose manganese chloride and a 12 weeks post-treatment period. Three groups of 16 animals each received daily doses of 14.84 and 59.36mg/kg b.w. MnCl(2) (control: distilled water) via(More)
Young adult male Wistar rats (24/group) were treated for 5 weeks with methyl mercury(II)chloride (corresponding to 0.5 and 2.0mgHg°/kg b.w., control: distilled water) by gavage, followed by a 19 weeks post-treatment period. Spontaneous motility, psychomotor performance and sensorimotor gating was repeatedly tested, electrophysiological recordings done, in(More)
In an attempt to model occupational and environmental Mn exposures and their possible interaction, young male Wistar rats were exposed to Mn by oral administration in dissolved form (MnCl(2)·4H(2)O, 14.84 and 59.36 mg/kg b.w.) and by intratracheal application of MnO(2) nanoparticles (2.63 mg/kg b.w.). After 3 and 6 weeks oral, or 3 weeks oral plus 3 weeks(More)
Male Wistar rats were treated for 4, 8 and 12 weeks with 3.5, 7.0 or 14.0 mg/kg cadmium (in the form of cadmium chloride) by gavage. Changes induced in certain electrophysiological parameters-electrocorticogram frequency; latency and duration of cortical sensory evoked potentials; conduction velocity and relative and absolute refractory periods of a(More)
Mercury is a neurotoxic compound causing irreversible disorders of the central and peripheral nervous system. In some of the previous human and experimental studies mercury also affected some functional neurological parameters such as EEG, and cortical evoked potentials. In the present study, the effect of subchronic (4, 8, and 12 weeks) relatively(More)
The central and peripheral nervous system effects of acute and subchronic exposure to three organic phosphoro-acid esters (dimethoate, dichlorvos, parathion-methyl) were studied. CNS-dependent variables included mean EEG amplitude, mean frequency of the EEG, and the activity (power density) of six component frequency bands. Peripheral nervous system(More)