Thermoacclimatory modification of red cell ionic composition in rainbow trout, Salmo gairdneri: Possible relationship with (Na+/K+)- and (HCO3−)-stimulated atpase activities

摘要: Abstract 1. Plasma and packed red cell concentrations of sodium, potassium, calcium, magnesium, chloride water were determined in rainbow trout acclimated to 4, 12 20°C, mean erythrocytic these ions estimated. 2. Cellular potassium levels increased, while those calcium magnesium declined with increases acclimation temperature period only. These changes, through their effects upon hemoglobin-oxygen affinity would be expected facilitate oxygen release. 3. (HCO3−)- (Na+/K+)-ATPase activities assayed at 25°C appropriate temperatures. Preparations from 4 20°C animals also 4°C intervals between for Arrhenius plot. 4. (HCO3−)-ATPase activity increased temperature. There was little evidence other than thermal influence. (Na+/K+)-stimulated rose assays carried out Thermal sensitivities differed preparations cold- warm-acclimated animals. 5. Alterations (Na+/K+)- (HCO3)-stimulated significantly correlated modifications respectively.