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Journal of Bacteriology logoLink to Journal of Bacteriology
. 1974 Jun;118(3):1132–1143. doi: 10.1128/jb.118.3.1132-1143.1974

Cell Envelope Morphology of Rumen Bacteria

J W Costerton 1, H N Damgaard 1, K-J Cheng 1
PMCID: PMC246864  PMID: 4133611

Abstract

The cell walls of three species of rumen bacteria (Bacteroides ruminicola, Bacteroides succinogenes, and Megasphaera elsdenii) were studied by a variety of morphological methods. Although all the cells studied were gram-negative and had typical cytoplasmic membranes and outer membranes, great variation was observed in the thickness of their peptidoglycan layers. Megasphaera elsdenii evidenced a phenomenally thick peptidoglycan layer whose participation in septum formation was very clearly seen. All species studied have cell wall “coats” external to the outer membrane. The coat of Bacteroides ruminicola is composed of large (approximately 20 nm) globules that resemble the protein coats of other organisms, whereas the coat of Bacteroides succinogenes is a thin and irregular carbohydrate coat structure. Megasphaera elsdenii displays a very thick fibrillar carbohydrate coat that varies in thickness with the age of the cells. Because of the universality of extracellular coats among rumen bacteria we conclude that the production of these structures is a protective adaptation to life in this particular, highly competitive, environment.

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Selected References

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