Microbial Transformations of Metals

Summers, Anne O.; Silver, Simón

doi:10.1146/annurev.mi.32.100178.003225

Cited by 408 publications

(215 citation statements)

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“…In most environments sampled to date, tellurite-resistant organisms comprise ϳ10% of the total culturable microbial population (26,28,32,34). Resistance to tellurite has been reported in a few Gram-positive bacteria (2,26,33) and in a number of 7,10,13,22,27,38).…”

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confidence: 99%

Aeration Controls the Reduction and Methylation of Tellurium by the Aerobic, Tellurite-Resistant Marine Yeast Rhodotorula mucilaginosa

Ollivier

Bahrou

Church

et al. 2011

Appl Environ Microbiol

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We previously described a marine, tellurite-resistant strain of the yeast Rhodotorula mucilaginosa that both precipitates intracellular Te(0) and volatilizes methylated Te compounds when grown in the presence of the oxyanion tellurite. The uses of microbes as a "green" route for the production of Te(0)-containing nanostructures and for the remediation of Te-oxyanion wastes have great potential, and so a more thorough understanding of this process is required. Here, Te precipitation and volatilization catalyzed by R. mucilaginosa were examined in continuously aerated and sealed (low oxygen concentration) batch cultures. Continuous aeration was found to strongly promote Te volatilization while inhibiting Te(0) precipitation. This differs from the results in sealed batch cultures, for which tellurite reduction to Te(0) was found to be very efficient. We show also that volatile Te species may be degraded rapidly in medium and converted to the particulate form by biological activity. Further experiments revealed that Te(0) precipitates produced by R. mucilaginosa can be further transformed to volatile and dissolved Te species. However, it was not clearly determined whether Te(0) is a required intermediate for Te volatilization. Based on these results, we conclude that low oxygen concentrations will be the most efficient for production of Te(0) nanoparticles while limiting the production of toxic volatile Te species, although the production of these compounds may never be completely eliminated. 9), and there has been interest in the microbial production of Te-containing nanoparticles (3) for applications such as composite or compound nanomaterials in solar cells and as an alternative for bench-scale syntheses. We recently described (26) a series of obligately aerobic, tellurite-resistant microbes isolated from salt marsh sediments that efficiently produce intracellular Te-containing nanostructures in a complex growth medium without any specialized growth requirements. The same strains also volatilized a small proportion of the supplied Te as methylated species. Here we further describe the interactions of one of these organisms, the yeast Rhodotorula mucilaginosa, with Te and how these interactions are modulated by aeration.In aerobic soils and aquatic environments, tellurium occurs primarily as the tellurite [TeO 3 2Ϫ or Te(IV)] and tellurate [TeO 4 2Ϫ or Te(VI)] oxyanions. While tellurite is the most water soluble, both are freely available to living organisms.Tellurite has been employed as an antimicrobial therapeutic agent (31, 34), and it is about 10 times more toxic to both Gram-positive and Gram-negative microorganisms than tellurate (37, 39). Tellurite toxicity may be related to its activity as a strong oxidizing agent toward biological materials (17,25,34), although some disagree with this model (40).Microbial tellurite resistance is a widespread phenomenon. In most environments sampled to date, tellurite-resistant organisms comprise ϳ10% of the total culturable microbial population (26,28,32,34). Resistan...

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confidence: 99%

Aeration Controls the Reduction and Methylation of Tellurium by the Aerobic, Tellurite-Resistant Marine Yeast Rhodotorula mucilaginosa

Ollivier

Bahrou

Church

et al. 2011

Appl Environ Microbiol

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“…For example, volatilization of mercury by the cells (see reviews 2,3) or binding of mercury to the cells [36] could alter concentrations and homogeneity of distribution of mercury.…”

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confidence: 99%

“…The most useful measurement of water availability is "water activity" (a w ), defined as the ratio of the equilibrium vapor pressure of water over the material in question to that of pure water at the same temperature [ Much of the current environmental literature devotes considerable attention, for example, to the biological transformations, transport, and reaccumulation in new reservoirs (often biological) of many trace toxic elements, especially those frequently certified in needed SRMs [2,3]. Fortunately, modern measurement techniques and methods are available which are uniquely suited to assess the formation of certain molecular species containing elements of concern even if this occurs slowly and at very low concentrations.…”

Section: Introductionmentioning

confidence: 99%

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Biodeterioration of standard reference materials

Olson¹,

Iverson²,

Brinckman³

1981

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“…Entretanto, deve-se considerar que todos são potencialmente tóxicos em concentrações elevadas, provocando desnaturação de proteínas e bloqueios de sítios de ligação de enzimas (Siqueira et al, 1994). Cd, Pb e Sn são tóxicos na forma de cátions e tendem a ser ainda mais tóxicos quando estão ligados às substâncias orgânicas (Summers & Silver, 1978).…”

Section: Introductionunclassified

Indicadores de qualidade de solos em área de mineração e metalurgia de chumbo: I - microrganismos

Barros

Melo

Dionísio

et al. 2010

Rev. Bras. Ciênc. Solo

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RESUMOOs microrganismos são os mais numerosos da fração biológica do solo e estão sujeitos a alterações em sua abundância e nas relações metabólicas em função de mudanças ambientais, como o aporte de poluentes ao solo. O objetivo deste trabalho foi avaliar a atividade microbiana de solos da área de mineração e metalurgia de chumbo (Pb), no município de Adrianópolis (PR), a fim de gerar indicadores biológicos da qualidade desses solos. Os solos foram amostrados (0 a 5 e 5 a 10 cm) em cinco locais e em quatro épocas do ano (maio, setembro, novembro e janeiro). Os teores totais de

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Microbial Transformations of Metals

Cited by 408 publications

References 2 publications

Aeration Controls the Reduction and Methylation of Tellurium by the Aerobic, Tellurite-Resistant Marine Yeast Rhodotorula mucilaginosa

Aeration Controls the Reduction and Methylation of Tellurium by the Aerobic, Tellurite-Resistant Marine Yeast Rhodotorula mucilaginosa

Biodeterioration of standard reference materials

Indicadores de qualidade de solos em área de mineração e metalurgia de chumbo: I - microrganismos

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