title: Concentration and seasonal variations of purine bases, nucleotides and nucleotide-sugars in liver of Bufo arenarum. Comparison with early embryogenesis.
abstract: A comparative study of the bases, nucleotides and nucleotide-sugars was performed in liver of Bufo arenarum. Samples were obtained at different seasons of the year, according to the periods of active (December-March) and passive metabolism (April-July). It was found that guanine and hypoxanthine increase significantly in spring. A remarkable decrease in the levels of the nucleosides triphosphates adenosine 5'-triphosphate (ATP) and guanosine 5'-triphosphate (GTP) was found in spring; correlatively, an increase in the levels of adenosine 5'-monophosphate (AMP) and guanosine 5'-monophosphate (GMP) and adenosine 5'-pyrophosphate (ADP) and guanosine 5'-pyrophosphate (GDP was observed. A notable increase in the amounts of uridine 5'-diphosphate- D - glucose (UDP-glucose) was detected at the end of the period of low metabolism, which is coincident wtih a decrease in the level of glycogen, observed by other authors.
mesh_terms: D000818:Animals; D001001:Anura; D001483:Base Sequence; D002022:Bufo arenarum / Q000196:embryology / Q000378:metabolism*; D002241:Carbohydrates / Q000032:analysis*; D005260:Female; D008099:Liver / Q000032:analysis* / Q000378:metabolism; D011684:Purine Nucleosides / Q000032:analysis*; D011685:Purine Nucleotides / Q000032:analysis*; D012621:Seasons
chemical_list: D002241:Carbohydrates; D011684:Purine Nucleosides; D011685:Purine Nucleotides