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1. The progressive development of resistance to reactivation by an oxime (;aging') shown by a series of alkyl methylphosphonyl-acetylcholinesterases is slow when the alkyl group is a primary alcohol, whether or not the carbon chain is branched, but is much more rapid if the alkyl group is a secondary or cyclic alcohol. 2. Aging is accelerated by increase of temperature or decrease of pH. 3. Aging is inhibited by the quaternary amine N-methylpyridinium iodide. 4. The results are discussed in relation to the role played by aging in the therapy of poisoning by organophosphorus compounds.

Factors influencing the rate of ‘aging’ of a series of alkyl methylphosphonyl-acetylcholinesterases