A Symposium on Mechanisms of Toxicity by W. N. Aldridge (eds.)

By W. N. Aldridge (eds.)

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L. N. RAO Department of Biochemistry, Cornell University Medical College, N. Y. Glutamine synthetase catalyses the coupled energy-requiring synthesis of glutamine from glutamate and ammonia and the energy-providing cleavage of adenosine 5'-triphosphate (ATP) to adenosine 5'-diphosphate (ADP) and inorganic phosphate (Pi) in accordance with the reaction shown in Fig. 1 (for reviews, Meister, 1962, 1968). During the past few coo- CONH2 CH2 CH2 I l I + A TP + NH4 + I CHNHa+ I CH2 coo- glutamine <;: synthetase Mg2+ ' CH I 2 ~HNHa+ + ADP +Pi I coo- Fro.

LAZANAS, J. C. (1959). Ann. Y. Acad. , 80, 583. SOME NEW EFFECTS OF ANTICHOLINESTERASES IN THE WHOLE ANIMAL, WITH SPECIAL EMPHASIS ON THE HYPOTHERMIA INDUCING ACTION IN THE RAT E. ), The Netherlands At the turn of the century, the study of the effects of cholinesterase inhibitors began with the work of Pal and of Rothberger (see Werner & Kuperman, 1963) on physostigmine, and since then an immense amount of information has been brought together about the toxicological and pharmacological properties of these compounds.

6 at the start of the exposure to cold. Thus, it may well be that in that case both the signal and the response were below normal. The experiments described show that the presumed cholinergic hyperexcitation which follows on injection of an anti-ChE induces a reduction of the heat production as well as an increase in heat release. The possibility considered earlier (Meeter, 1969) that the release of heat through the tail might be the sole cause of the anti-ChE hypothermia is clearly ruled out by experiments like those of Fig.

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