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- W1520731330 abstract "Isolated cell wall preparations of Proteus vulgaris consist of arrays of two components: the complete cell wall (comprising the rigid mucopeptide and protein layer or R layer, a lipopolysaccharide layer and a lipoprotein layer) of thickness 144 Å; and a spheroplast wall of thickness 92 Å corresponding to the cell wall after the loss of the labile R layer. The first-order low-angle X-ray reflexion corresponding to the thickness of each wall component is diffuse, but the higher orders are sharp. It is shown that this occurs if the distribution of electron density through the thickness of each component is non-centrosymmetrical and if the occurrence is random of right- and left-handed parallel sheet structures within the specimens. The interpretation of the X-ray data is made in terms of a centrosymmetrical average structure for each component which is the result of superimposing right- and left-handed units. For both the 92 Å spheroplast wall and the complete wall, with phases determined by reference to the electron micrographs, the average centrosymmetrical structures were found by trial-and-error methods. A method is then described of separating the superimposed right- and left-handed units and thus producing non-centrosymmetrical structures for the spheroplast and whole cell walls. These structures are closely related to the structures observed by electron microscopy, but they also make use of the information contained in the X-ray diffraction patterns. Although the electron density distributions so deduced are to some extent arbitrary, they are entirely consistent with the X-ray data, so far as phase angles may be assigned to the reflexions, and they are of a nature such that slight distortions would produce images similar to those seen in the electron microscope after embedding and sectioning." @default.
- W1520731330 created "2016-06-24" @default.
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- W1520731330 date "1967-01-01" @default.
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- W1520731330 title "Structure of the cell wall of the Gram-negative bacterium Proteus vulgaris" @default.
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- W1520731330 doi "https://doi.org/10.1016/s0022-2836(67)80002-0" @default.
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