.... 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...

...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...

... 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...

... 04 01 1990 © 1990 by Company of Biologists 1990 Manduca sexta K + -ATPase active transport osmoregulation pH transport alkalinization Larval Lepidoptera are voracious, rapidly growing phytophages. It is not surprising, therefore, to find that the midgut dominates...