Two parameters account for the flocculated growth of microbes in biodegradation assays

Brandt, Bernd W.; Kooijman, S.A.L.M.

doi:10.1002/1097-0290(20001220)70:6<677::aid-bit10>3.0.co;2-3

Cited by 16 publications

(8 citation statements)

References 18 publications

(18 reference statements)

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“… on yeasts, Lorena et al . on microalgae) and readily explains the difference between flocculated growth and growth in cell suspension (Brandt & Kooijman ) and the effect of genome size on population growth (Stouthamer & Kooijman ).…”

Section: An a Priori Respiration Calculationmentioning

confidence: 99%

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Reconciling theories for metabolic scaling

Maino

Kearney

Nisbet

et al. 2013

Journal of Animal Ecology

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110

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Summary1. Metabolic theory specifies constraints on the metabolic organisation of individual organisms. These constraints have important implications for biological processes ranging from the scale of molecules all the way to the level of populations, communities and ecosystems, with their application to the latter emerging as the field of metabolic ecology. While ecologists continue to use individual metabolism to identify constraints in ecological processes, the topic of metabolic scaling remains controversial. 2. Much of the current interest and controversy in metabolic theory relates to recent ideas about the role of supply networks in constraining energy supply to cells. We show that an alternative explanation for physicochemical constraints on individual metabolism, as formalised by dynamic energy budget (DEB) theory, can contribute to the theoretical underpinning of metabolic ecology, while increasing coherence between intra-and interspecific scaling relationships. 3. In particular, we emphasise how the DEB theory considers constraints on the storage and use of assimilated nutrients and derive an equation for the scaling of metabolic rate for adult heterotrophs without relying on optimisation arguments or implying cellular nutrient supply limitation. Using realistic data on growth and reproduction from the literature, we parameterise the curve for respiration and compare the a priori prediction against a mammalian data set for respiration. 4. Because the DEB theory mechanism for metabolic scaling is based on the universal process of acquiring and using pools of stored metabolites (a basal feature of life), it applies to all organisms irrespective of the nature of metabolic transport to cells. Although the DEB mechanism does not necessarily contradict insight from transport-based models, the mechanism offers an explanation for differences between the intra-and interspecific scaling of biological rates with mass, suggesting novel tests of the respective hypotheses.

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Section: An a Priori Respiration Calculationmentioning

confidence: 99%

“…on ciliates, Kooijman & Kooi 1996 on myxamoebae, Hanegraaf, Stouthamer & Kooijman 2000; Muller 2011; Muller et al 2011 on yeasts, Lorena et al 2010 on microalgae) and readily explains the difference between flocculated growth and growth in cell suspension(Brandt & Kooijman 2000) and the effect of genome size on population growth(Stouthamer & Kooijman 1993).…”

mentioning

confidence: 96%

Reconciling theories for metabolic scaling

Maino

Kearney

Nisbet

et al. 2013

Journal of Animal Ecology

Self Cite

110

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“…5). Product exchange is probably the reason that many micro-organisms live in flocks, rather than in free suspension (Brandt & Kooijman, 2000). Ascomycetes make physical contact with green algae in lichens.…”

Section: Eight Steps To Endosymbiosismentioning

confidence: 99%

Quantitative steps in symbiogenesis and the evolution of homeostasis

Kooijman¹,

Auger²,

Poggiale³

et al. 2003

Biological Reviews

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The merging of two independent populations of heterotrophs and autotrophs into a single population of mixotrophs has occurred frequently in evolutionary history. It is an example of a wide class of related phenomena, known as symbiogenesis. The physiological basis is almost always (reciprocal) syntrophy, where each species uses the products of the other species. Symbiogenesis can repeat itself after specialization on particular assimilatory substrates. We discuss quantitative aspects and delineate eight steps from two free-living interacting populations to a single fully integrated endosymbiotic one. The whole process of gradual interlocking of the two populations could be mimicked by incremental changes of particular parameter values. The role of products gradually changes from an ecological to a physiological one. We found conditions where the free-living, epibiotic and endobiotic populations of symbionts can co-exist, as well as conditions where the endobiotic symbionts outcompete other symbionts. Our population dynamical analyses give new insights into the evolution of cellular homeostasis. We show how structural biomass with a constant chemical composition can evolve in a chemically varying environment if the parameters for the formation of products satisfy simple constraints. No additional regulation mechanisms are required for homeostasis within the context of the dynamic energy budget (DEB) theory for the uptake and use of substrates by organisms. The DEB model appears to be dosed under endosymbiosis. This means that when each free-living partner follows DEB rules for substrate uptake and use, and they become engaged in an endosymbiotic relationship, a gradual transition to a single fully integrated system is possible that again follows DEB rules for substrate uptake and use.

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“…Applying this diffusion-limitation concept, Pochana et al (1999) developed a dynamic microbial model of the activated sludge floc to simulate the behavior of nitrogen and carbon compounds in sequencing batch reactors (SBRs). Brandt and Kooijman (2000) presented a simple two-parameter (floc size at division and diffusion length) extension of growth models for cell suspensions to account for the reduction of the degradation rate due to diffusion limitation.…”

Section: Introductionmentioning

confidence: 99%

Clarifying the roles of kinetics and diffusion in activated sludge filamentous bulking

Lou

Reyes

2008

Biotech & Bioengineering

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We hypothesized that the growth rates of filaments and floc formers in activated sludge are affected by the combination of kinetic selection (Lou and de los Reyes, Biotechnol Bioeng 92(6): 729-739, 2005b) and substrate diffusion limitation (Martins et al., Water Res 37:2555-2570, 2003). To clarify the influence of these factors in explaining filamentous bulking, a conceptual framework was developed in this study. The framework suggests the existence of three different regions corresponding to bulking, non-bulking, and intermediate regions, based on substrate concentration. In the bulking and non-bulking regions, kinetic growth differences control the competition process, and filaments or floc formers dominate, respectively. In the intermediate region, substrate diffusion limitation, determined by the floc size, plays the major role in causing bulking. To test this framework, sequencing batch reactors (SBRs) were operated with influent COD of 100, 300, 600, and 1,000 mg/L, and the sludge settleability was measured at various floc size distributions that were developed using different mixing strengths. The experimental data in the bulking and intermediate regions supported the proposed framework. A model integrating the two factors was developed to simulate the substrate concentrations at different depths and floc sizes under intermittently feeding conditions. The modeling results confirmed that substrate diffusion limitation occurs inside the flocs at a certain range of activated sludge floc sizes over the operation cycle, and provided additional support for the proposed framework.

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Two parameters account for the flocculated growth of microbes in biodegradation assays

Cited by 16 publications

References 18 publications

Reconciling theories for metabolic scaling

Reconciling theories for metabolic scaling

Quantitative steps in symbiogenesis and the evolution of homeostasis

Clarifying the roles of kinetics and diffusion in activated sludge filamentous bulking

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