Closure to “Design Relationship for Filters in Bed Protection” by K. J. Bakker, H. J. Verheij, and M. B. de Groot

Bakker, K.J.; Verheij, H.J.; Groot, M.B. de

doi:10.1061/(asce)0733-9429(1996)122:3(178)

Cited by 6 publications

(7 citation statements)

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“…This indicates that the addition of pbuA to B24Rif failed to improve the ecological fitness of the strain in the rhizosphere of sugarbeet in this soil under the experimental conditions used. Previous work has shown that Pseudomonas mutants deficient in the production of siderophores were not impaired in rhizosphere colonisation [35,36].…”

Section: Discussionmentioning

confidence: 99%

Rhizosphere competence of fluorescent Pseudomonas sp. B24 genetically modified to utilise additional ferric siderophores

Moënne‐Loccoz¹

1996

FEMS Microbiology Ecology

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The ability to utilise additional siderophores may increase the ecological fitness of biocontrol inoculants of Pseudomonas in the rhizosphere. Plasmid pCUP2 carries a copy of the gene pbuA coding for the membrane receptor of ferric pseudobactin M114. Pseudomonas sp. B24Rif containing pCUP2 can utilise ferric pseudobactin of P. fluorescens M114 in addition to its own siderophore. A larger fraction of the culturable resident fluorescent pseudomonads in the rhizosphere of sugarbeet grown in a low‐iron sandy loam soil could supply siderophore‐complexed iron to B24Rif(pCUP2) rather than to B24Rif. However, B24Rif and B24Rif(pCUP2) were found at similar population levels in the rhizosphere for 21 days after their inoculation on seeds. A total of 25 of 43 isolates of resident fluorescent Pseudomonas unable to cross‐feed iron to B24Rif could cross‐feed B24Rif(pCUP2) and they were subdivided into seven different strains by arbitrary‐primed PCR fingerprinting. The siderophores produced by 11 of them were typed by HPLC and they were similar to pseudobactin M114. However, the ability to utilise ferric pseudobactin M114 did not improve the ecological fitness of B24Rif in the rhizosphere of sugarbeet although a larger fraction of the culturable resident fluorescent pseudomonads could supply pseudobactin M114‐complexed iron to B24Rif(pCUP2) than to B24Rif.

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Section: Discussionmentioning

confidence: 99%

Rhizosphere competence of fluorescent Pseudomonas sp. B24 genetically modified to utilise additional ferric siderophores

Moënne‐Loccoz¹

1996

FEMS Microbiology Ecology

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“…The first case corresponds to the negative curvatures R V , R eff found in the crumpled phase, the second corresponds to the approximate four-sphere behavior N ′ (r) ∝ sin 3 r/r 0 found in the transition region [5]. Further support for the negative curvature interpretation of the crumpled phase comes from probing the DT euclidean spacetimes with scalar test particles [7]. Solving the equation…”

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confidence: 88%

“…We tried to see if the nonrelativistic formula E b = G 2 m 5 /4 could be used to define a renormalized Newton constant G, but the binding energy did not seem to behave like m 5 . The reason for this may be strong finite size effects: using G 2 = 4E b /m 5 for the smallest mass suggested a Planck length √ G of only a third of the typical length scale of the configurations, r m [8].…”

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confidence: 99%

Remarks on the quantum gravity interpretation of 4D dynamical triangulation

Smit¹

1997

Nuclear Physics B - Proceedings Supplements

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We review some of the phenomenology in 4D dynamical triangulation and explore its interpretation in terms of a euclidean effective action of the continuum form4D Dynamical Triangulation (DT) is a formulation of purely euclidean geometrodynamics [1]. Its customary canonical partition function readswhere the summation is over all distinct triangulations T (describing simplicial manifolds) with S 4 topology and N k , k = 0, 1, . . . , 4 is the number of k-simplices. The way the model is derived shows that κ 2 ∝ 1/G 0 , with G 0 the bare Newton constant. In this talk I explore a tentative continuum interpretation of the model, described by the effective theoryHere the path integral is over real metrics modulo coordinate transformations, G denotes a renormalized Newton constant and the · · · indicate higher derivative terms like R 2 , etc. There may also be nonlocal terms related to the conformal anomaly [2]. The integral over µ produces the volume fixing delta function δ( d 4 x √ g − V ). If this integral were done in the saddle point approximation, the saddle point value µ c would be related to a renormalized cosmological constant byIn general the higher order terms may be present in an effective action. Here we ex-pect them to regulate the unboundedness of the Einstein-Hilbert part in the ultraviolet. The underlying DT model is finite and the nontrivial results of numerical simulations show that the action is not stuck at its minimum value in the relevant κ 2 range. So entropy effects somehow provide a regulating effect which can be implemented in S eff through the higher order terms.Let us now go through some of the DT phenomenology found in numerical simulations and compare this with the effective action (3). 1. There is a crumpled phase (κ 2 < κ c 2 ) and an elongated phase (κ 2 > κ c 2 ), which has characteristics of a branched polymer [3]. Since κ 2 ∝ 1/G 0 this suggests that the effective theory also has a transition at some value of 1/G, presumably near 1/G = 0. 2. Recent evidence [4] indicates strongly that the transition between the two phases is first order. This is often seen as a disaster for a continuum interpretation. However, we have suggested earlier [5] that continuum behavior may be automatic without tuning to a second order phase transition. This happens in DT in two dimensions. A field theoretic example is provided by the purely discrete Z(n) gauge-Higgs systems. For sufficiently large but finite n these models have a Coulomb phase with massless photons and a Higgs phase separated by a first order transition [6]. The models can approximate the continuum abelian Higgs model arbitrarily well. Analysis of the continuum model shows the possibility of a first order phase transition. 3. Continuum behavior is supported by evidence

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“…al. have performed experiments in yeast cells, and observed oscillations both in individual cells and populations of cells [8,9]. The authors conclude that the coupling of the cells via an extracellular metabolite (proposed to be acetaldehyde) causes the oscillations of the individual cells to synchronise.…”

Section: Introductionmentioning

confidence: 99%

“…The authors conclude that the coupling of the cells via an extracellular metabolite (proposed to be acetaldehyde) causes the oscillations of the individual cells to synchronise. In [9], two cell popula-tions, originally oscillating 180 • out of phase, became synchronised upon coupling, and a time to synchronise was measured.…”

Section: Introductionmentioning

confidence: 99%

Synchronization of stochastic oscillators in biochemical systems

Challenger

McKane²

2013

Phys. Rev. E

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We investigate the synchronization of stochastic oscillations in biochemical models by calculating the complex coherence function within the linear noise approximation. The method is illustrated on a simple example and then applied to study the synchronization of chemical concentrations in social amoeba. The degree to which variation of rate constants in different cells and the volume of the cells affects synchronization of the oscillations is explored and the phase lag calculated. In all cases the analytical results are shown to be in good agreement with those obtained through numerical simulations.

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Closure to “Design Relationship for Filters in Bed Protection” by K. J. Bakker, H. J. Verheij, and M. B. de Groot

Cited by 6 publications

References 0 publications

Rhizosphere competence of fluorescent Pseudomonas sp. B24 genetically modified to utilise additional ferric siderophores

Rhizosphere competence of fluorescent Pseudomonas sp. B24 genetically modified to utilise additional ferric siderophores

Remarks on the quantum gravity interpretation of 4D dynamical triangulation

Synchronization of stochastic oscillators in biochemical systems

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