title: [C13/C12 Ratios in human urinary calculi].
abstract: Oxalate, uric acid, and phosphate stones have been analyzed for their carbon isotope composition. The oxalate stones show delta13C values between -17.0 and -19.5%, the uric acid stones between -14.9 and -19.4%, and the phosphate stones between -13.0 and -23.9%. It is proposed that endogenic rather than exogenic sources are responsible for the 13C/12C ratios of the stones. The isotopic composition of the phosphate stones seems to be influenced primarily by bacterial activity.
mesh_terms: D002247:Carbon Isotopes; D006801:Humans; D010070:Oxalates / Q000032:analysis; D010710:Phosphates / Q000032:analysis; D014527:Uric Acid / Q000032:analysis; D014545:Urinary Calculi / Q000378:metabolism*
chemical_list: D002247:Carbon Isotopes; D010070:Oxalates; D010710:Phosphates; D014527:Uric Acid
vernacular_title: 13C/12C-Verhältnisse in menschlichen Harnkonkrementen.