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Journal of Cell Science, Vol 2, 587-591, Copyright © 1967 by Company of Biologists

Submitted on June 15, 1967

The Structure of the Macromolecular Units on the Cell Walls of Bacillus Polymyxa

J. T. FINCH 1, A. KLUG 2, and M.V. NERMUT 3

1 Medical Research Council Laboratory of Molecular Biology, Hills Road, Cambridge
2 Medical Research Council Laboratory of Molecular Biology Hills Road, Cambridge
3 Institute of Virology, Czechoslovak Academy of Sciences Bratislava 9, Czechoslovakia

Electron micrographs of negatively stained preparations of cell walls of Bacillus polymyxa have been investigated by optical diffraction and optical filtering techniques. Images of single layers of the cell wall, from which the ‘noise’ has been filtered optically, show hollow, square-shaped morphological units arranged on a square lattice of side 100 Å. Single-layer images showing the same pattern have been filtered from moiré patterns arising from two overlapping single layers. The morphological units are composed of four smaller subunits. The optical diffraction patterns from regions of two overlapping layers show extra reflexions which are attributed to multiple electron scattering.

Submitted on June 15, 1967






© The Company of Biologists Ltd 1967