title: A microbiological study of dental calculus. IV. An electron microscopic study of in vitro calcified microorganisms.
mesh_terms: D001419:Bacteria / Q000378:metabolism / Q000648:ultrastructure*; D002113:Calcification, Physiologic; D003728:Dental Calculus / Q000382:microbiology*; D006801:Humans; D008854:Microscopy, Electron