Abstract

Bacteria are surrounded by a cell wall which is responsible for the shape and osmotic stability of the cell. Electron microscopy of thin sections of Gram-positive bacteria reveals a single layer of wall, in which little fine structures can be determined lying outside the cytoplasmic membrane. This contrasts with the picture of a Gram-negative cell envelope, in which an outer membrane surrounds a much thinner, structureless layer of peptidoglycan outside the cytoplasmic membrane.

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