... Gill ontogeny Ion regulation Ornithine urea cycle OUC Rhesus proteins Urea transporter Ammonia is generated as a waste product of protein and amino acid catabolism. In this Review, ‘ammonia’ refers to total ammonia, whereas ‘NH 3 ’ and ‘NH 4 + ’ refer to non-ionic and ionic ammonia...

... pharyngeal movements were involved in urea excretion in P. sinensis . Urea excretion through the mouth was sensitive to phloretin inhibition, indicating the involvement of urea transporters (UTs). In addition, saliva samples collected from the buccopharyngeal surfaces of P. sinensis injected...

...Marvin H. Braun; Shelby L. Steele; Steve F. Perry SUMMARY While adult zebrafish, Danio rerio , possess ammonia and urea transporters (Rh and UT proteins, respectively) in a number of tissues, they are most heavily concentrated within the gills. UT has a diffuse expression pattern within Na + -K...

... urea transporter (UT) in the kidney of the dogfish Triakis scyllia . We isolated a cDNA encoding a UT that is homologous to the facilitative UT cloned from another dogfish species, Squalus acanthias . The Triakis UT mRNA is abundantly expressed in the kidney, while low levels of expression were...

[email protected] ) 21 7 2003 © The Company of Biologists Limited 2003 2003 amino acid ammonia arginase carbamoyl phosphate synthetase dipnoan lungfish glutamine synthetase ornithine-urea cycle Protopterus dolloi urea urea transporter The fish-tetrapod transition represents...

..., there is an effective decrease in permeability to urea resulting from the presence of specific secondarily active (Na + -coupled) urea transporters in gills and kidney and from the modification of lipid composition in the gills( Fines et al., 2001 ; Walsh and Smith, 2001 ). ammonia amino acid elasmobranch...