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Biomedical subjects

Z S Herman

Publications and source records attributed to Z S Herman.

At least 109 records · Page 6Linked to original sources
PubMed1976

The influence of ATP and AMP injected into the lateral ventricles of the brain on behavior in rats.

The influence of ATP and AMP injected into the lateral cerebral ventricle in doses of 50, 100 and 200 mug on behavior in rats was studied. ATP in the doses administered had no effect on behavior of rats. AMP in these doses enhanced motor activity of the rats. Chemical sympathectomy by intracerebral injection of 6-hydroxy-dopamine did not affect the action of either of the compounds on behavior of rats. AMP potentiated the action of intracerbrally administered noradrenaline on behavior of the animals.

Adenosine Monophosphate↗
PubMed1975

Behavioural changes induced in conscious mice by intracerebroventricular injection of catecholamines, acetylcholine and 5-hydroxytryptamine.

1 A simple method of injecting soluble substances into the lateral ventricle of the brain of the conscious mouse is described. 2 The effect of various doses of noradrenaline, dopamine, acetylcholine, 5-hydroxytryptamine given into the right lateral brain ventricle were tested on locomotor and exploratory activities of mice. 3 Noradrenaline in a dose of 0.1 mug increased locomotor activity. This effect was prevented by phenoxybensamine but not by propranolol. 4 Higher doses of noradrenaline (1 or 10 mug) decreased locomotor and exploratory activities. Propranolol but not phenoxybenzamine abolished these effects. 5 Dopamine (0.1 or 1 mug) increased locomotor activity. The higher doses also induced tremor. 6 The highese dose of dopamine tested (10 mug) elicited stereotypical behaviour. 7 All the behavioural phenomena induced by 0.1 mug and 10 mug of dopamine were blocked by pimozide. 8 Acetylcholine (1 and 10 mug) and 5-hydroxytryptamine (1 mug) inhibited locomotor and exploratory activity. 9 The effects of 1 and 10 mug of acetylcholine were abolished by atropine (5 mg/kg i.p. Methysergide (5 mg/kg i.p.) had no influence on the effects of 5-hydroxytryptamine (1 mug).

Acetylcholine↗
PubMed1975

Changes of certain pharmacological and biochemical indices in acute methylglyoxal poisoning.

Methylglyoxal in doses over 25 mg/kg injected intravenously in cats and rabbits produces distinct changes in the cardiovascular and respiratory systems, but has no effect on respiration or circulation when injected intraperitoneally even in doses up to 1 g/kg. The effect of MG on blood pressure depends on the species of the animal. The effects of MG are dose-related and dependent on the route of its administration. Biochemical studies showed a significant rise in serum activities of creatine kinase (EC 2-7-3-2), lactate dehydrogenase (EC 1-1-1-27) and aspartate aminotransferase (EC 2-6-1-1-) after intraperitoneal injection of MG in the dose of 200 mg/kg in rabbits and 500 mg/kg in rats. The observed changes probably indicate damage of muscle tissue by MG, presumably as a result of low content of one of the glyoxalases in the muscles of the experimental animals. Elevation of glucose levels by MG was probably an adrenergic effect. These biochemical changes can serve to evaluate toxicity of MG preparations, which exhibit variations probably owing to varying degree of polymerization.

Alanine Transaminase↗
PubMed1975

The impairment of learning of conditioned avoidance response in rats after 6-hydroxydopamine.

Intraventricular injection of 250 mug of 6-hydroxydopamine, twice in two days apart caused a complete abolition of learning of conditioned avoidance response (CAR) in rats. L-DOPA in a dose of 100 mg/kg and then in a dose of 200 mg/kg 1. p. injected during several days did not restore the learning of CAR. This indicates that intact catecholaminergic neurons are essential for the learning of CAR. We suggest that different brain mechanisms are involved in learning and maintaining gross locomotor behavior.

Animals↗
PubMed1975

Action of biogenic amines injected intracerebrally on duration of hexobarbital-induced sleep in rats.

The influence of intracerebrally injected biogenic amines and cyclic AMP dibutyrate on duration of sleep induced with hexobarbital (50 mg/kg i.v.) in rats was studied. Duration of sleep was markedly prolonged by adrenaline, noradrenaline, dopamine, 5-hydroxydopamine and acetylcholine. Cyclic AMP dibutyrate injected 30 minutes before hexobarbital shortened time of sleep. The role of biogenic amines in hexobarbital-induced sleep is discussed.

Acetylcholine↗