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. 1972 Mar;109(3):1198–1209. doi: 10.1128/jb.109.3.1198-1209.1972

Ultrastructure of the Exosporium and Underlying Inclusions in Spores of Bacillus megaterium Strains1

T Cabrera Beaman a, H Stuart Pankratz a, Philipp Gerhardt a
PMCID: PMC247344  PMID: 4110924

Abstract

Spores of selected strains of Bacillus megaterium were prepared by various methods and examined with the electron microscope. An exosporium like that of B. cereus, with a nap and basal layer, was found in spores of a B. megaterium strain that reportedly contains a capsule-like exosporium. The exosporium occasionally appeared to be doubled or have an apical opening. Pili-like filaments were discerned on the surface. Beneath the exosporium were found large deposits of planar inclusions, which in cross section appeared laminated and in surface views consisted of a patchwork of striated packets with a periodicity of ∼5 nm. The inclusions were usually attached to the exosporium, but in ultrastructure they differed from both the exosporium and coat. In two other strains of B. megaterium, one or two coats occurred but a typical exosporium was not present.

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These references are in PubMed. This may not be the complete list of references from this article.

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