more than the telling of just-so stories. . Thus the coordinated assembly of rod and the P- and L-rings could have been a relatively late innovation. . These homologs, namely ExbBD (Kojima and Blair, 2001) and TolQR (Cascales., 2001 provide a simpler and much more direct ancestor for MotAB. . These are selective forces that would favor the spread and diversification of the channel, after its origin as an efficiency-improving measure. Addition of a new domain with novel functionality was identified twice (FliNCheC - FliM, rod capmuramidase - FlgJ although it probably occurred in additional instances where homologies are currently more vague. . That is, if the people buried at Casal Bertone and Castellaccio Europarco were living in an industrial area or were metalworkers, then they were more at risk for high levels of lead than were people not living in those areas and not doing those jobs. The rotary motor of bacterial flagella.
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For a typical small molecule (e.g. Modified filament-first hypothesis The filament-first hypothesis has the disadvantage of explaining the addition of distal subunits to the filament before a tube structure could evolve. . Figure 5 : Various secretion systems of prokaryotes. Figure 7 : Summary of the evolutionary model for the origin of the flagellum, showing the six major stages and key intermediates. . The bacterial flagellum is now one of the best understood molecular complexes, although numerous detailed questions remain concerning the function of various protein components and the exact mechanism of torque generation. . There are several avenues of investigation that might clarify matters, which I will explore in the future. Proc R Soc Lond B Biol Sci. This advantage would increase as exported substrates became larger, because the peptidoglycan cell wall only allows the diffusion of globular proteins with a size less than about 50 kDa (Young, 2001 as protein size increased, diffusion would be increasingly impeded. . Left justify or justify your essay and type in the hyphens yourself where needed.
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