.... Branchial Na + ,K + -ATPase activity was much higher in SW gills, but could not be activated by NH 4 + . Overall, the more effective response of SW trout was explained by differences in physical chemistry between SW and FW, which greatly reduced the plasma NH 3 tension gradient for NH 3 entry, as well...

... for a successful terrestrial invasion. Crabs can actively uptake or excrete ions upon salinity change, and the gills play a major role among the osmoregulatory organs. Several enzymes are involved in the osmoregulatory process, including Na + ,K + -ATPase and V-type H + -ATPase (V-H + -ATPase). Na + ,K + -ATPase...

... are functionally similar in seawater, but in freshwater the gills actively absorb Na + but not Cl – , whereas the opercular epithelium actively absorbs Cl – but not Na + . These differences in freshwater physiology are likely due to differences in absolute levels of gene expression (measured using real-time PCR...

...Lars O. E. Ebbesson; Christian K. Tipsmark; Bo Holmqvist; Tom Nilsen; Eva Andersson; Sigurd O. Stefansson; Steffen S. Madsen SUMMARY We investigated the relationship between nitric oxide (NO) and Na + ,K + -ATPase (NKA) in the gill of anadromous Atlantic salmon. Cells containing NO-producing...

... ). Modulation of ion transport by direct targeting of protein phosphatase type 1 to the Na-K-Cl cotransporter. J. Biol. Chem. 276 , 34359 -34362. Darman, R. B. and Forbush, B. ( 2002 ) A regulatory locus of phosphorylation in the N terminus of the Na-K-Cl cotransporter, NKCC1. J. Biol. Chem. 277...

... in the brain of five mammalian and eight avian species ranging in size from 30 g mice to 280 kg cattle and 13 g zebra finches to 35 kg emus, respectively. Sodium pump(Na + ,K + -ATPase) activity was higher in the smaller species and showed a significant allometric decline with body mass in both the mammals...

.... Biol. 63 , 143 -159. Tucker, L. E. ( 1977a ). Effects of dehydration and rehydration on the water content and Na + and K + balance in adult male Periplaneta americana . J. Exp. Biol. 71 , 49 -66. Tucker, L. E. ( 1977b ). Regulation of ions in the haemolymph of the cockroach...

...J. C. Fenwick; S. E. Wendelaar Bonga; G. Flik ABSTRACT In vivo treatment with external bafilomycin A 1 , a selective inhibitor of V-ATPase H + pumps, reduced whole-body Na + influx by up to 90 % in young tilapia and 70 % in young carp. The inhibition was rapidly reversible, with whole-body Na...

...Leila V. Virkki; Annika Salama; Mikko Nikinmaa ABSTRACT We have measured the effects of oxygen tension on the transport of Na + , K + and Cl − across the erythrocyte membrane of the lamprey Lampetra fluviatilis . The transport of each ion was affected by the oxygen tension of the medium. Hypoxic...