Choline sterase and transport of sodium chloride through gills q/Eriocheir sinensis (M.Edw.) 



the activated hydrogen. Accordingly the effects of well-known hydrogen carriers 

 like methylene blue and pyocyanine were tested, and they proved to be excellent 

 inhibitors of salt absorption (Figure 3) not only in the gills of the crab but also in the 

 anal papillae of Chironomus (Figure 4). Their action is rapid and consistent and, after 

 washing the gills of the crab, their effects proved to be completely reversible. 



Table I 



Chemical group 



E' 



Concen- 

 tration 



Result 



19 



