title: Seasonal fluctuations of pancreatic activities and cyclic nucleotide levels in the frog Rana esculenta.
abstract: 1. Seasonal influence on pancreatic activity has been determined in the frog Rana esculenta. 2. Protein content, amylase activity and cyclic nucleotide levels, show significant changes throughout the year, being higher in the active period (spring, summer), with respect to a constant pancreas weight. 3. A significant correlation between protein content and cyclic AMP levels has been observed. 4. Results suggest that feeding habits exert a control on the pancreatic activity even if stimuli other than food intake cannot be ruled out.
mesh_terms: D000064:Acclimatization; D000681:Amylases / Q000378:metabolism; D000818:Animals; D000242:Cyclic AMP / Q000378:metabolism*; D006152:Cyclic GMP / Q000378:metabolism*; D010179:Pancreas / Q000378:metabolism*; D011893:Rana esculenta; D012621:Seasons
chemical_list: D000242:Cyclic AMP; D000681:Amylases; D006152:Cyclic GMP