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The surface growth and activity ofNitrobacter

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Abstract

The effect of surface attachment on oxidation of nitrite to nitrate byNitrobacter was studied in batch culture, on glass coverslips, and in continuous culture on glass beads and anion exchange resin beads in an air-lift column fermenter. In batch culture, the surfaces stimulated specific growth rate, while in continuous culture, activity of attached cells was less than that of freely suspended cells. Nitrate productivity, free cell productivity, and attached cell concentration increased exponentially at the same specific rate, termed the colonization rate, and nitrate productivity was found to be a convenient estimate of biomass concentration. Permanent attachment was mediated by production of slime material. Surface growth resulted in multiple steady states and the ability to respond quickly to changes in dilution rate. The air-lift column fermenter system provided a convenient system for the study of growth and activity of attached cells and was most suitable when using ion exchange resins as a substratum for attachment.

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Authors and Affiliations

  1. Department of Genetics and Microbiology, University of Aberdeen, Marischal College, AB9 1AS, Aberdeen, Scotland, UK

    G. Anne Keen & J. I. Prosser

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  1. G. Anne Keen
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  2. J. I. Prosser
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Keen, G.A., Prosser, J.I. The surface growth and activity ofNitrobacter . Microb Ecol 15, 21–39 (1988). https://doi.org/10.1007/BF02012950

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