title: Erythrocytic organic phosphates: diel and seasonal cycles in the frog, Rana berlandieri.
abstract: Hemoglobin (Hb) concentration, hematocrit (Hct), total organic phosphates (Ptot), nucleoside triphosphates (NTP), 2,3-diphosphoglycerate (DPG), and "inositol polyphosphates" (IPP) were measured in the erythrocytes of adult frogs at different times of day in winter and summer after acclimatization to 15 degrees C and an LD 12:12 photoperiod. The same measurements were also made on animals acclimated to LD 16:8 in summer. All of the measured parameters varied significantly at different times of the day and between seasons in animals acclimated to an LD 12:12 photoperiod. Summer animals acclimated to LD 16:8 showed significant diel cycles only in Hct and Hb.
mesh_terms: D019794:2,3-Diphosphoglycerate; D000064:Acclimatization; D000818:Animals; D002940:Circadian Rhythm; D004163:Diphosphoglyceric Acids / Q000097:blood*; D004912:Erythrocytes / Q000378:metabolism*; D006400:Hematocrit; D006454:Hemoglobins / Q000378:metabolism*; D007295:Inositol Phosphates / Q000097:blood*; D011898:Ranidae; D012265:Ribonucleotides / Q000097:blood*; D012621:Seasons; D013403:Sugar Phosphates / Q000097:blood*
chemical_list: D004163:Diphosphoglyceric Acids; D006454:Hemoglobins; D007295:Inositol Phosphates; D012265:Ribonucleotides; D013403:Sugar Phosphates; D019794:2,3-Diphosphoglycerate