Bioremediation of uranium-bearing wastewater: Biochemical and chemical factors influencing bioprocess application

Macaskie, Lynne E.; Yong, Ping; Doyle, Timothy C.; Roig, Manuel G.; Díaz, Margarita; Manzano, Teresa Martínez

doi:10.1002/(sici)1097-0290(19970105)53:1<100::aid-bit13>3.0.co;2-s

Cited by 75 publications

(41 citation statements)

References 25 publications

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“…One biochemical response to toxic substances is production of extracellular polymers that bind and effectively immobilize the compound and, in some cases, biomineralization. For example, microbes immobilize U by intra-and extracellular precipitation of secondary minerals (109,110). Alternatively, some microbes exposed to arsenic employ mobile genetic structures (plasmids) to manufacture proteins that (although counterintuitive) reduce the less toxic As 5ϩ to more toxic As 3ϩ and secrete it from their cells (111).…”

Section: Application Of Insights From the Lichen-mineral Interface Tomentioning

confidence: 99%

Biological impact on mineral dissolution: Application of the lichen model to understanding mineral weathering in the rhizosphere

Banfield

Barker

Welch

et al. 1999

Proc. Natl. Acad. Sci. U.S.A.

516

282

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Microorganisms modify rates and mechanisms of chemical and physical weathering and clay growth, thus playing fundamental roles in soil and sediment formation. Because processes in soils are inherently complex and difficult to study, we employ a model based on the lichenmineral system to identify the fundamental interactions. Fixed carbon released by the photosynthetic symbiont stimulates growth of fungi and other microorganisms. These microorganisms directly or indirectly induce mineral disaggregation, hydration, dissolution, and secondary mineral formation. Model polysaccharides were used to investigate direct mediation of mineral surface reactions by extracellular polymers. Polysaccharides can suppress or enhance rates of chemical weathering by up to three orders of magnitude, depending on the pH, mineral surface structure and composition, and organic functional groups. Mg, Mn, Fe, Al, and Si are redistributed into clays that strongly adsorb ions. Microbes contribute to dissolution of insoluble secondary phosphates, possibly via release of organic acids. These reactions significantly impact soil fertility. Below fungi-mineral interfaces, mineral surfaces are exposed to dissolved metabolic byproducts. Through this indirect process, microorganisms can accelerate mineral dissolution, leading to enhanced porosity and permeability and colonization by microbial communities.

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Section: Application Of Insights From the Lichen-mineral Interface Tomentioning

confidence: 99%

Biological impact on mineral dissolution: Application of the lichen model to understanding mineral weathering in the rhizosphere

Banfield

Barker

Welch

et al. 1999

Proc. Natl. Acad. Sci. U.S.A.

516

282

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“…This environment is characterized by a constant influx of a single biodegradable organic compound A, for example, a xenobiotic (Alexander 1981;Leahy and Colwell 1990;Macaskie et al 1997;Lee et al 1998). We assume that bacteria can degrade A using a branched pathway (Fig.…”

Section: Fig 1 the Metabolic Pathwaymentioning

confidence: 99%

From Metabolism to Polymorphism in Bacterial Populations: A Theoretical Study

Tenaillon

Godelle

2001

Evolution

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Abstract. Stable polymorphisms are commonly observed in experimental bacterial populations grown in homogeneous media. Evidence is accumulating that metabolic interactions might be the main mechanism underlying the emergence and maintenance of such polymorphisms. To date, however, attempts to model the evolution of bacterial polymorphism have not considered metabolism as a possible component of polymorphism maintenance. Here, we propose a simulation approach to model the evolution of selected polymorphisms in a bacterial population. Using recent knowledge of the relationship between bacterial fitness and metabolism, we build a simple metabolic model and test the effect of resource competition on polymorphism. Without making an a priori hypothesis on fitness functions, we show that stable polymorphic situations could be observed under high nutrient competition, and we propose a functional, metabolismbased explanation to the debated issue of polymorphism maintenance.

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“…Many types of microorganisms have been investigated for use in this application (6)(7)(8)(9)(10)(11)(12)(13)(14)(15). Microorganisms would be suited for the use in CAT, because they have a size in the micrometer range.…”

Section: Introductionmentioning

confidence: 99%

Adsorption of egg albumin onto methylated yeast biomass

Seki

Suzuki

Maruyama

2004

Journal of Colloid and Interface Science

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A new biosorbent, methylated yeast (MeYE), was prepared for the adsorptive separation of proteins from aqueous solutions. Yeast was methylated in a 0.1 M HCl methyl alcohol solution at room temperature. About 80% of the carboxylic groups of yeast could be methylated within 9 h. The adsorption of egg albumin to MeYE was studied to evaluate the protein adsorption ability of MeYE. At near neutral pH, egg albumin was scarcely adsorbed to unmethylated yeast and the adsorption amount of egg albumin increased with increasing the methylation degree. The adsorption amount of egg albumin to MeYE increased with increasing pH from 4 to 7 and steeply decreased above pH 7. The Langmuir isotherm was applied to determine the apparent adsorption constant and the saturated adsorption amount of egg albumin to MeYE. Both the apparent adsorption constant and the saturated adsorption amount increased with the degree of methylation. The saturated adsorption amount of egg albumin to MeYE having methylation degree 77% was 8.41×10 -6 mol g -1 or 0.378 g g -1 at near neutral pH.

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Bioremediation of uranium-bearing wastewater: Biochemical and chemical factors influencing bioprocess application

Cited by 75 publications

References 25 publications

Biological impact on mineral dissolution: Application of the lichen model to understanding mineral weathering in the rhizosphere

Biological impact on mineral dissolution: Application of the lichen model to understanding mineral weathering in the rhizosphere

From Metabolism to Polymorphism in Bacterial Populations: A Theoretical Study

Adsorption of egg albumin onto methylated yeast biomass

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