Abstract
Eleven inhibitors were tested with cholinesterases of bloods of horse, man, guinea pig, dog, rat, and sheep on acetyl-, propionyl-, n-butyryl-, isobutyryl-, n-valeryl, isovaleryl-, benzoyl-and acetyl-beta-methyl-choline. Based on the effect of changes of acyl groups in choline esters on their hydrolysis by true and pseudo cholinesterase an explanation of the different sensitivities of the 2 enzymes for organo-phosphorus inhibitors was suggested.