In vitro changes in the activity of ATPases in the gills of Carcinus maenas exposed to various concentrations of p,p′-DDT
Abstract Enzyme preparations of gill homogenates from the shore crab ( Carcinus maenas ) were exposed to concentrations of p , p ′-DDT in ethanol (95%)m ranging from 10 −10 M to 10 −5 M DDT. The specific activities of Mg 2+ -ATPase, Na + , K + -ATPase and Total(Na + , K + , Mg 2+ )-ATPase were assayed. Mg 2+ -ATPase activity was inhibited at all concentrations of DDT. Na + , K + -ATPase was slightly stimulated at all concentrations. The activity of Total-ATPase was unaffected at the lower concentrations but was inhibited at higher concentrations.