Balanus amphitrite unsegmented eggs demonstrate a cholinesterase activity which does not change significantly during cleavage. Between stage 5 (early gastrula) and stage 12 (unhatched nauplius) the enzyme activity increases gradually about 15 times; a further increase, at a lower rate, takes place before hatching. $10^{-5}M$ Eserine causes a cholinesterase inhibition decreasing from approximately 75% at the early stages to 45% in the unhatched nauplius. Conversely, DFP inhibits cholinesterase increasingly from 8% to 30% (Table II). No effects are obtained with iso-OMPA. The results are discussed with regard to the function and specificity of cholinesterases in embryos of Balanus.
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Con il contributo del Ministero per i Beni e le Attività Culturali