... and the Na + /K + -ATPase (NKA), was measured in this tissue. NKA activity was increased approximately 4- to 5-fold in urodaeum from SW-acclimated crocodiles versus FW-acclimated animals ( t -test, P <0.002) ( Fig. 5 ). A similar trend was observed for the proton pump, although this trend escaped...

... individuals (141 mmol l –1 vs 134 mmol l –1 ), but the hematocrit remained unchanged. In seawater-acclimated individuals, branchial Na + /K + -ATPase (NKA) activity was higher by 75%. Western blot analysis indicated that the abundance of the NKA α-subunit and a Na + /K + /2Cl – cotransporter (NKCC1) were...

... species. To investigate putative renal ion regulatory mechanisms, we examined the distribution and abundance of Na + /K + -ATPase (NKA) and the Na + /K + /2Cl – cotransporter (NKCC2). In all species, NKA localized to the basolateral membranes of the distal tubule and the connecting segments and collecting...