...) and glycogen phosphorylase (GP),respectively. The present study aimed to examine the glycogen metabolism in fish liver and gills during acute exposure to seawater. In tilapia( Oreochromis mossambicus ) gill, GP, GS and glycogen were immunocytochemically colocalized in a specific group of glycogen-rich (GR...

... exercise(time 0), half of the metyrapone-treated fish received a single injection of cortisol, to mimic the post-exercise rise usually observed. Muscle glycogen and the relative activities of glycogen phosphorylase a (Phos a ) and glycogen synthase I (GSase I ), regulatory enzymes for glycogen resynthesis...

... the active and inactive forms of glycogen phosphorylase were higher in muscle in winter than in autumn, although the fraction in the active form did not change significantly. More of the phosphorylase was in the active form in the liver than in the muscle. Short-term starvation resulted in a significant...

... of alkaline phosphatase and MgCl 2 , PFK showed a reduced sensitivity to activation by F6P. Serotonin had no significant effect on the kinetic properties of PK, while it increased the proportion of the active a form of glycogen phosphorylase. These results indicate that serotonin induces an increase...