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Two contrasting and very different proposals have been put forward to account for the evolutionary relationships among prokaryotes. The currently widely accepted three domain proposal by Woese et al. ( Proc. Natl. Acad. Sci. USA (1990) 87 : 4576-4579) calls for the division of prokaryotes into...
Two classes of parasites with an environmental stage in their lifestyle have recently emerged as significant gastrointestinal pathogens for humans. Microsporidia represent a group that contains a number of genera related to the genus Cryptosporidium . They are generally transmitted via direct...
The free-living bacteria of the genus Azospirillum live in close association with plant roots and represent one of the best-characterized plant growth promoting rhizobacteria (PGPR). The attachment of Azospirillum to the roots is essential for the establishment of an efficient association with...
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