title: Ultrasonic preparation of fat-free biological materials for elemental analysis.
mesh_terms: D000818:Animals; D004602:Elements / Q000032:analysis*; D005223:Fats / Q000302:isolation & purification*; D008460:Meat / Q000032:analysis; D009754:Nuts / Q000032:analysis; D012756:Sheep; D014465:Ultrasonics
chemical_list: D004602:Elements; D005223:Fats