The effect of pH and/or calcium-enriched freshwater on gill Ca2+-ATPase activity and osmotic water inflow in rainbow trout (Salmo gairdneri)

Effects of ambient ion concentrations on gill ATPases in fresh water eel,Anguilla anguilla

“…However, this enzyme was only estimated for 100 /zM Ca 2 + without the presence of ligand in the incubating medium. Parker et al (1985) found a lower activity at 3 mM in trout exposed to Ca 2 +-enriched FW (1.5 mM) than in fish in dechlorinated tap water (0.05 mM Ca 2 + ) and the same tendency in activity measured at 100 /aM Ca 2+ although the difference was not significant. The discrepancies in these results probably reflect the variety of experimental conditions used (species, starvation, external medium composition, isolation and incubation procedure, precise control of Ca 2 + concentration).…”

“…Shephard (1981) found a positive relationship between the activities of Ca 2 + ATPase and the external calcium concentration suggesting that the activity of this enzyme is related to an outward transport. Parker et al (1985) studied the effects of acclimating trout to two external Ca 2 + concentrations on Ca 2 + enzyme activities measured subsequently at 100 zM and 3 mM Ca 2 + concentrations, but did not observe significant variations.…”

Effects of ambient ion concentrations on gill ATPases in fresh water eel,Anguilla anguilla

“…However, this enzyme was only estimated for 100 /zM Ca 2 + without the presence of ligand in the incubating medium. Parker et al (1985) found a lower activity at 3 mM in trout exposed to Ca 2 +-enriched FW (1.5 mM) than in fish in dechlorinated tap water (0.05 mM Ca 2 + ) and the same tendency in activity measured at 100 /aM Ca 2+ although the difference was not significant. The discrepancies in these results probably reflect the variety of experimental conditions used (species, starvation, external medium composition, isolation and incubation procedure, precise control of Ca 2 + concentration).…”

“…Shephard (1981) found a positive relationship between the activities of Ca 2 + ATPase and the external calcium concentration suggesting that the activity of this enzyme is related to an outward transport. Parker et al (1985) studied the effects of acclimating trout to two external Ca 2 + concentrations on Ca 2 + enzyme activities measured subsequently at 100 zM and 3 mM Ca 2 + concentrations, but did not observe significant variations.…”

Effects of ambient ion concentrations on gill ATPases in fresh water eel,Anguilla anguilla

“…However, this enzyme was only estimated for 100 /zM Ca 2 + without the presence of ligand in the incubating medium. Parker et al (1985) found a lower activity at 3 mM in trout exposed to Ca 2 +-enriched FW (1.5 mM) than in fish in dechlorinated tap water (0.05 mM Ca 2 + ) and the same tendency in activity measured at 100 /aM Ca 2+ although the difference was not significant. The discrepancies in these results probably reflect the variety of experimental conditions used (species, starvation, external medium composition, isolation and incubation procedure, precise control of Ca 2 + concentration).…”

“…Shephard (1981) found a positive relationship between the activities of Ca 2 + ATPase and the external calcium concentration suggesting that the activity of this enzyme is related to an outward transport. Parker et al (1985) studied the effects of acclimating trout to two external Ca 2 + concentrations on Ca 2 + enzyme activities measured subsequently at 100 zM and 3 mM Ca 2 + concentrations, but did not observe significant variations.…”

Effects of ambient ion concentrations on gill ATPases in fresh water eel,Anguilla anguilla

“…However, this enzyme was only estimated for 100 /zM Ca 2 + without the presence of ligand in the incubating medium. Parker et al (1985) found a lower activity at 3 mM in trout exposed to Ca 2 +-enriched FW (1.5 mM) than in fish in dechlorinated tap water (0.05 mM Ca 2 + ) and the same tendency in activity measured at 100 /aM Ca 2+ although the difference was not significant. The discrepancies in these results probably reflect the variety of experimental conditions used (species, starvation, external medium composition, isolation and incubation procedure, precise control of Ca 2 + concentration).…”

“…Shephard (1981) found a positive relationship between the activities of Ca 2 + ATPase and the external calcium concentration suggesting that the activity of this enzyme is related to an outward transport. Parker et al (1985) studied the effects of acclimating trout to two external Ca 2 + concentrations on Ca 2 + enzyme activities measured subsequently at 100 zM and 3 mM Ca 2 + concentrations, but did not observe significant variations.…”