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. 1968 Oct;96(4):1400–1412. doi: 10.1128/jb.96.4.1400-1412.1968

Cores, Microbial Organelles Possibly Specific to Group D Streptococci

Ruth G McCandless 1,2, Morris Cohen 1,2, George M Kalmanson 1,2, Lucien B Guze 1,2
PMCID: PMC252467  PMID: 4971888

Abstract

A long, thin, approximately cylindrical core spans the interior of cells of 24-hr cultures of all group D streptococci that were examined, five strains of Streptococcus faecalis, single strains of S. faecalis subsp. zymogenes and S. durans, and three strains of Streptococcus spp. In one strain of S. faecalis, serial section electron microscopy showed that most cells possess a core. The core is 0.10 to 0.16 μm thick and consists of a matrix and an axial array of ribosomelike particles. It resembles one of two types of cores present in a stable protoplast form of one of the S. faecalis strains. Cores were not present in single strains of S. pyogenes (β-hemolytic group A), S. agalactiae (group B), S. dysgalactiae (group C), S. equisimilis (group C), and S. mitis (viridans group) that were examined; nor were cores observed in single strains of Staphylococcus aureus, Escherichia coli, and Bacillus megaterium. Cores may be useful, therefore, in identification of group D streptococci. For preservation and rapid recognition of cores, a glutaraldehyde-osmium tetroxide sequence of fixation appears superior to the osmium tetroxide method often employed in processing bacteria for electron microscopy.

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