title: A study of structural and chemical composition of surgically recovered defective dura mater cardiac valves using SEM, TEM and x-ray analysis.
mesh_terms: D000293:Adolescent; D000328:Adult; D001021:Aortic Valve / Q000473:pathology / Q000601:surgery*; D001705:Bioprosthesis; D002118:Calcium / Q000378:metabolism; D003094:Collagen / Q000378:metabolism; D003238:Connective Tissue / Q000473:pathology; D004388:Dura Mater; D006350:Heart Valve Prosthesis; D006801:Humans; D008855:Microscopy, Electron, Scanning; D008875:Middle Aged
chemical_list: D003094:Collagen; D002118:Calcium