.... There was no relationship between ammonia secretion and Na + reabsorption. These data indicate that increased renal ammonia secretion during acidosis is probably mediated through Rhesus (Rh) glycoproteins and occurs independently of Na + transport, in contrast to branchial and epidermal models of Na + -dependent ammonia...

...-giessen.de ) 29 5 2002 © The Company of Biologists Limited 2002 2002 leech Hirudo medicinalis Na + transport invertebrate amiloride cyclic AMP ATP adenosine UTP Fresh water represents a hypo-osmotic environment to the leech, in which it has to cope with the loss of salts...

...Helga Milde; Wolf-Michael Weber; Michel Salzet; Wolfgang Clauss ABSTRACT An increase in intracellular cyclic AMP concentration stimulates transepithelial Na + transport across the skin of the leech Hirudo medicinalis , but it is unclear how cytosolic cyclic AMP levels are elevated in vivo...

... crab gill Carcinus maenas molecular cloning tissue distribution cDNA sequence Na + transport Xenopus laevis oocytes The Na + /H + antiporters, initially demonstrated in membrane vesicles prepared from mammalian kidney ( Murer et al . 1976 ), play important roles in ionic...

... in series, both involved in transepithelial Na + transport. Our recent investigations provided conclusive evidence that the H + pump of the frog skin is an H + V-ATPase. In transport studies, Na + absorption and H + secretion were blocked by micromolar concentrations of bafilomycin A 1 or concanamycin...

... Na + transport Cl - transport H + transport ammonia Ambystoma tigrinum The salamander Ambystoma tigrinum provides a good model for the study of the evolution of acid-base regulatory mechanisms during the transition of vertebrates from the aquatic to the terrestrial environment...