Add time:08/07/2019         Source:sciencedirect.com

The structure of the regular surface layer of Acetogenium kivui has been investigated by electron microscopy in conjunction with image processing techniques. From the averaged unit cell structure a tentative model of the subunit organization is derived. The occurrence of mono- and polycrystalline S-layer sheets is interpreted in terms of transitions related to the growth cycle of cell. The question is raised as to whether the striking structural similarity of S-layers, even from evolutionary rather distant species, is due to divergent or convergent evolution.

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