title: Density, porosity, and structure of dried cell walls isolated from Bacillus megaterium and Saccharomyces cerevisiae.
abstract: Helium displacement and nitrogen adsorption techniques were used to determine the density and porosity, respectively, of freeze-dried cell walls isolated from Bacillus megaterium KM and Saccharomyces cerevisiae. The densities were 1.302 and 1.180 g/cm3, respectively, suggesting noncrystalline solids. The porosities were extremely small, indicating that the cell walls had collapsed and become essentially impervious upon lyophilization.
mesh_terms: D001410:Bacillus megaterium / Q000648:ultrastructure*; D002473:Cell Wall / Q000648:ultrastructure; D005612:Freeze Drying; D012441:Saccharomyces cerevisiae / Q000648:ultrastructure*