.... Biol.   152 , 521 - 547 . Goss , G. , Gilmour , K. , Hawkings , G. , Brumbach , J. H. , Huynh , M. and Galvez , F. ( 2011 ). Mechanism of sodium uptake in PNA negative MR cells from rainbow trout, Oncorhynchus mykiss as revealed by silver and copper inhibition . J...

... transport sodium uptake cortisol H + -ATPase carbonic anhydrase transepithelial potential Ammonia (throughout this paper, the term `ammonia' is used to refer to total NH 3 + NH 4 + , whereas these chemical symbols are used to refer to the two components) is a toxic end-product of protein...

... uptake is also present in trout gills. It demonstrates saturation kinetics with a comparably low K m (9.6 nmol l -1 ) but a lower maximum transport capacity ( J max =3.5 pmol g -1 h -1 )than the sodium-insensitive system. Sodium uptake exhibits saturation kinetics with a K m of 69 μmol l -1 . Copper...