title: [Mixed-nucleus renal calculi].
abstract: We made a crystallographic analysis of 87 mixed-nucleus stones and found 4 groups of stones of this kind, which are as follow: urico-oxalic, oxalico-uric, phosphato-oxalic and oxalic-phosphatic. We did not find any mixed-nucleus, urico-phosphatic or phosphatico-uric stones and we explain this fact according to the known lithogenic, metabolic mechanisms, in which urinary pH has an important function.
mesh_terms: D001031:Apatites / Q000032:analysis; D002129:Calcium Oxalate / Q000032:analysis; D002130:Calcium Phosphates / Q000032:analysis; D003461:Crystallography; D006801:Humans; D007669:Kidney Calculi; D008274:Magnesium / Q000032:analysis; D017616:Magnesium Compounds; D010710:Phosphates / Q000032:analysis; D000644:Quaternary Ammonium Compounds / Q000032:analysis; D000069877:Struvite; D014527:Uric Acid / Q000032:analysis
chemical_list: D001031:Apatites; D002130:Calcium Phosphates; D017616:Magnesium Compounds; D010710:Phosphates; D000644:Quaternary Ammonium Compounds; C021767:whitlockite; C016189:whewellite; D002129:Calcium Oxalate; D014527:Uric Acid; C016188:weddellite; D000069877:Struvite; D008274:Magnesium
vernacular_title: Cálculos renales de nucleo mixto.