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Research Article

Production of fimbrial adhesins K99 and F41 by enterotoxigenic Escherichia coli as a function of growth-rate domain.

H W van Verseveld, P Bakker, T van der Woude, C Terleth, F K de Graaf
H W van Verseveld
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P Bakker
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T van der Woude
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C Terleth
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F K de Graaf
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DOI: 
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ABSTRACT

The production of fimbrial adhesins K99 and F41 by enterotoxigenic Escherichia coli has been measured in steady-state chemostat experiments at various specific growth rates (microseconds) and in a recycling fermentor across a range of mu values falling to less than 0.004 h-1. It has been demonstrated that the production of K99 and F41 fimbriae is correlated with mu both in aerobic and anaerobic chemostat experiments. A significant production of fimbriae was only detected at mu values higher than 0.2 h-1. This behavior was further examined by culturing the bacteria in a recycling fermentor with complete biomass retention. It could be shown that the production of K99 and F41 fimbriae only occurred during balanced growth, with a high biomass yield at mu values higher than 0.04 h-1 corresponding to mass doubling times (td) of less than 17 h. The production of both fimbriae halted during balanced growth with a lower biomass yield (at mu values between 0.012 and 0.04 h-1 corresponding to td values between 17 and 58 h) and unbalanced stringent growth (at mu values lower than 0.012 h-1 or td values higher than 58 h). The external pH of the medium greatly influenced the production of both K99 and F41 fimbriae. At pH values lower than 7, the production of fimbriae was strongly inhibited. Also, at pH values higher than 7, a decrease in production was observed. The consequences of the observed phenomena for the pathogenic behavior of this E. coli strain are discussed.

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Production of fimbrial adhesins K99 and F41 by enterotoxigenic Escherichia coli as a function of growth-rate domain.
H W van Verseveld, P Bakker, T van der Woude, C Terleth, F K de Graaf
Infection and Immunity Jul 1985, 49 (1) 159-163; DOI:

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Production of fimbrial adhesins K99 and F41 by enterotoxigenic Escherichia coli as a function of growth-rate domain.
H W van Verseveld, P Bakker, T van der Woude, C Terleth, F K de Graaf
Infection and Immunity Jul 1985, 49 (1) 159-163; DOI:
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