Bacterial survival in soil: Effect of clays and protozoa

England, Laura S.; Lee, Hung; Trevors, J. T.

doi:10.1016/0038-0717(93)90189-i

Cited by 152 publications

(77 citation statements)

References 52 publications

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“…Ces structures, observées seulement dans la suspensionépaissie, sont formées desépaississants colloïdaux et forment une matrice autour des cellules, ce qui pourrait favoriser la survie et l'activité bactériennes. En effet, des interactions entre bactéries et colloïdes (tels que les argiles) peuvent conduireà des effets positifs sur l'activité bactérienne [23,24].…”

Section: Essais De Croissance Bactérienneunclassified

Mise au point d’une suspension bactérienne épaissie pour l’exobiocicatrisation de matériaux cimentaires fissurés

Feurgard

Lors

Gagné

et al. 2016

Matériaux & Techniques

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Résumé -La précipitation de carbonate de calcium par les bactéries offre la possibilité de réparer les matériaux cimentaires fissurés par une méthode durable et non polluante. Une suspension bactérienné epaissie aété mise au point pour favoriser la biocicatrisation de microfissures entre 150 et 500 µm en utilisant la souche bactérienne Bacillus pseudofirmus. Le fluide obtenu, par synergie entre deuxépaississants colloïdaux, est fortement rhéofluidifiant et thixotrope, résistantà la décantation et forme lors d'un repos prolongé un gel physique réversible. Ces propriétés permettent de l'injecter sans drainage post-injection dans des fissures d'ouverture variant de 150à 500 µm. L'ajout d'épaississants n'a pas d'impact sur la croissance ni sur l'activité de B. pseudofirmus et entraîne la formation d'amas autour des bactéries. Cette structure similaireà un biofilm favorise potentiellement leur survie face aux contraintes du milieu extérieur. Mots clés : Mortier / microfissures / bactéries / biominéralisation /épaississantAbstract -Bacterial precipitation of calcium carbonate opens the way to a non-polluting and long lasting method for the remediation of cracked cementitious materials. We characterized a thickened bacterial suspension for its ability to be injected in fine cracks (150 to 500 µm) and to promote biocicatrisation by Bacillus pseudofirmus. The suspension, due to a synergy between two colloidal thickeners, is a strongly shear-thinning and thixotropic fluid, is resistant to settling, and can form a weak gel at rest. These properties allow its injection without drainage in 150 to 500 µm wide cracks. The thickened medium does not alter B. pseudofirmus growth or activity, and the bacteria are embedded in hutches creating a biofilm-like structure. This structure may provide a protective environment for the bacteria, enhancing their survival and activity in hostile conditions.

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Section: Essais De Croissance Bactérienneunclassified

Mise au point d’une suspension bactérienne épaissie pour l’exobiocicatrisation de matériaux cimentaires fissurés

Feurgard

Lors

Gagné

et al. 2016

Matériaux & Techniques

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“…A total of fourteen (14) lead solubilizing strains of Pseudomonas isolated from soils of a battery manufacturing plant in Ibadan [10] were rescreened for lead solubilising potentials [11]. The best three isolates…”

Section: Bacterial Strainsmentioning

confidence: 99%

Survival Trend of Lead Solubilizing Strains of Pseudomonas Species in Lead Polluted Soil Samples

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E²

2011

J Bioremediat Biodegrad

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“…This has been ascribed to protection involving a number of mechanisms, including seclusion from microbes (van Veen and Kuikman, 1990), reduced oxygen diffusion (Sexstone et al, 1985;Vor et al, 2003), and prevention of microbial predation within aggregates (England et al, 1993). Small aggregates (i.e.…”

Section: Aggregate Sizementioning

confidence: 99%

Measuring and modeling continuous quality distributions of soil organic matter

et al. 2010

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Abstract. An understanding of the dynamics of soil organic matter (SOM) is important for our ability to develop management practices that preserve soil quality and sequester carbon. Most SOM decomposition models represent the heterogeneity of organic matter by a few discrete compartments with different turnover rates, while other models employ a continuous quality distribution. To make the multicompartment models more mechanistic in nature, it has been argued that the compartments should be related to soil fractions actually occurring and having a functional role in the soil. In this paper, we make the case that fractionation methods that can measure continuous quality distributions should be developed, and that the temporal development of these distributions should be incorporated into SOM models. The measured continuous SOM quality distributions should hold valuable information not only for model development, but also for direct interpretation. Measuring continuous distributions requires that the measurements along the quality variable are so frequent that the distribution approaches the underlying continuum. Continuous distributions lead to possible simplifications of the model formulations, which considerably reduce the number of parameters needed to describe SOM turnover. A general framework for SOM models representing SOM across measurable quality distributions is presented and simplifications for specific situations are discussed. Finally, methods that have been used or have the potential to be used to measure continuous quality SOM distributions are reviewed. Generally, existing fractionation methods will have to be modified to allow measurement of distributions or new fractionation techniques will have to be develCorrespondence to: S. Bruun (sab@life.ku.dk) oped. Developing the distributional models in concert with the fractionation methods to measure the distributions will be a major task. We hope the current paper will help generate the interest needed to accommodate this.

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Bacterial survival in soil: Effect of clays and protozoa

Cited by 152 publications

References 52 publications

Mise au point d’une suspension bactérienne épaissie pour l’exobiocicatrisation de matériaux cimentaires fissurés

Mise au point d’une suspension bactérienne épaissie pour l’exobiocicatrisation de matériaux cimentaires fissurés

Survival Trend of Lead Solubilizing Strains of Pseudomonas Species in Lead Polluted Soil Samples

Measuring and modeling continuous quality distributions of soil organic matter

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