Synergistic stimulation by potassium and ammonium of 'K POT.+'-phosphatase activity in gill microsomes from the crab Callinectes ornatus acclimated to low salinity: novel property of a primordial pump - Garçon, Daniela P.; Lucena, Malson N.; Pinto, Marcelo R.; Fontes, Carlos F. L.; McNamara, John Campbell; Leone, Francisco de Assis (Archives of Biochemistry and Biophysics, 2013)