title: A simple apparatus for the freeze-drying of biological specimens preparatory to scanning electron microscopy.
mesh_terms: D000190:Actinomyces; D003773:Dental Plaque / Q000473:pathology; D005612:Freeze Drying / Q000295:instrumentation*; D006801:Humans; D008855:Microscopy, Electron, Scanning; D009584:Nitrogen; D013048:Specimen Handling
chemical_list: D009584:Nitrogen