Antonie van Leeuwenhoek

, Volume 67, Issue 4, pp 371–375 | Cite as

Assessment of survival during starvation ofEscherichia coli andKlebsiella pneumoniae in artificial urine: analysis of the kinetics of colony formation

  • O. Julia
  • J. Vives-Rego
  • M. Vilamú
  • R. López-Amorós
  • F. Utzet
Research Papers


A kinetic model of colony formation was proposed by Hattori, based on a count of the colonies that appear on a plate in successive short intervals of time. In this model, three parameters (λ,tr and N) are defined, which reflect the ability of a bacterium to yield colonies and allow us to described the dynamics of bacterial populations in soil and ofE. coli at different growth phases. In this paper we report a reparametrization of the kinetic model of colony formation, with the aim of facilitating more accurate calculation of λ andtr. Moreover, we observed that during the starvation ofE. coli andK. pneumoniae in urine, λ can be used to assess survival, since this parameter clearly decreases during starvation. Retardation time values (tr) were similar inE. coli andK. pneumoniae throughout the starvation experimental period.

Key words

stravation survival first order reaction kinetics colony formation urine 


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Copyright information

© Kluwer Academic Publishers 1995

Authors and Affiliations

  • O. Julia
    • 1
  • J. Vives-Rego
    • 2
  • M. Vilamú
    • 2
  • R. López-Amorós
    • 2
  • F. Utzet
    • 3
  1. 1.Department d'Estadística, Facultat de MatemàtiquesUniversitat de BarcelonaBarcelonaSpain
  2. 2.Department de Microbiologia, Facultat de BiologiaUniversitat de BarcelonaSpain
  3. 3.Department de MatemàtiquesUniversitat Autònoma de BarcelonaBellaterraSpain

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