title: The effects of long-term freezing preservation on urinary titratable acid and ammonium.
mesh_terms: D000136:Acid-Base Equilibrium; D000143:Acids / Q000652:urine*; D000641:Ammonia / Q000652:urine*; D005615:Freezing; D006801:Humans; D007668:Kidney / Q000378:metabolism; D013048:Specimen Handling / Q000379:methods*
chemical_list: D000143:Acids; D000641:Ammonia