title: Electron microscopic evaluation and x ray microanalysis of prosthetic dural cardiac valves surgically recovered.
mesh_terms: D004388:Dura Mater / Q000637:transplantation* / Q000648:ultrastructure; D004577:Electron Probe Microanalysis; D006350:Heart Valve Prosthesis; D006801:Humans; D008855:Microscopy, Electron, Scanning