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- W2077309903 abstract "Electron micrographs obtained after shadow-preparation of the cross-walls of cyanobacteria belonging to the genus Spirulina showed that the walls have a perfect sectorial pleat, its size in different species being related to the magnitude of their trichome pitch. Further, shadow-preparation caused a decrease in diameter of the cells of Spirulina platensis of 40%, with a 10% extra shrinkage of the diameter of the cross-wall. Both phenomena no doubt reflect certain material properties of the peptidoglycan layer which is responsible for the inherent rigidity of the cell envelope, and also constitutes the cross-wall. Probably, these material properties determine both the in vivo helical shape and the in vitro occurrence of the overlap in Spirulina cross-walls, and also allow for flexibility and variability in shape of the organism as a whole. Four hypotheses are put forward to explain the observed phenomena; on the basis of mechanical considerations it is most likely that the pleat in the cross-wall as observed in vitro must be ascribed to anisotropic shrinkage upon dehydration during shadow-preparation of the cross-walls. This anisotropy might be due to the polysaccharide chains of the peptidoglycan layer running in the circumferential direction and the peptide side-chains running in the radial direction. With this hypothesis the difference between the diameters in vitro of the cell envelope and the cross-wall can also be accounted for, within an error of 1·2%." @default.
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- W2077309903 date "1980-01-01" @default.
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- W2077309903 title "Some theoretical considerations on the in vitro shape of the cross-walls in Spirulina spp" @default.
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- W2077309903 doi "https://doi.org/10.1016/0022-5193(80)90103-4" @default.
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