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J. Biophys. and Biochem. Cytol., Vol 6, 221-224, Copyright © 1959 by Rockefeller University Press

ARTICLE

Electron Microscope Observations on the Behavior of the Bacterial Cytoplasmic Membrane During Cellular Division



George B. Chapman Ph.D.1

1 From the Biological Laboratories, Harvard University, Cambridge

Bacterial cells were fixed in OsO4, washed, dehydrated, and embedded in a methacrylate mixture. Ultrathin sections were cut on a Porter-Blum ultramicrotome and were examined in an RCA electron microscope, type EMU-2D.

The sections revealed that the cytoplasmic membrane undergoes a centripetal growth to form a membrane septum. This septum is formed as a double structure. Constriction of the daughter cells and deposition of cell wall material lead to the separation of the daughter cells.

The bacterial cytoplasm appears to consist largely of 200 A granules and occasionally reveals arrays of parallel dense lines.

Submitted on April 4, 1959


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