title: [Constant ratio of purine and pyrimidine bases in desoxyribonucleic acid of bull spermatozoa before and after deep-freezing].
mesh_terms: D000225:Adenine / Q000032:analysis; D000818:Animals; D002417:Cattle; D002852:Chromatography, Ion Exchange; D003596:Cytosine / Q000032:analysis; D004247:DNA / Q000032:analysis*; D005615:Freezing; D006147:Guanine / Q000032:analysis; D006868:Hydrolysis; D008297:Male; D010472:Perchlorates; D011687:Purines / Q000032:analysis*; D011743:Pyrimidines / Q000032:analysis*; D013094:Spermatozoa / Q000032:analysis*; D013941:Thymine / Q000032:analysis
chemical_list: D010472:Perchlorates; D011687:Purines; D011743:Pyrimidines; D006147:Guanine; D003596:Cytosine; D004247:DNA; D000225:Adenine; D013941:Thymine
vernacular_title: Constance du rapport des bases puriques et pyrimidiques de l'acide desoxyribonucléique de spermatozoïdes de taureau avant et après congélation.