Abstract
Quaternary phosphonium compounds were found to be reversible inhibitors of cholinesterases of various animals and showed species-specificity of action depending on the inhibitor structure. It became possible to reveal difference in inhibitory specificity of various preparations of acetylcholinesterases. A difference has been shown in inhibitory parameters of the series of phosphonium toward cholinesterase of visual ganglia of individuals of the squid Berryteuthis magister from different zones of the habitat areal. For the first time, when comparing phosphonium and ammonium isologues - tetrabutyl- and tributylhe-xyl derivatives, it has been shown that they are agents practically similar by the character of anticholinesterase action.
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