Chemical Transformation of Toxic Metals by a Pseudomonas Strain From a Toxic Waste Site

Blake, Robert C.; Choate, Donna M.; Bardhan, Smriti; Revis, N. W.; Barton, Larry L.; Zocco, T.G.

doi:10.1897/1552-8618(1993)12[1365:ctotmb]2.0.co;2

Cited by 45 publications

(35 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…4 and 5) (16). DeLeo and Ehrlich reported that formation of Cr(III) precipitates was not evident in batch and continuous cultures of P. fluorescens LB300 (13), whereas Pseudomonas chromatophilia, P. ambigua, and Pseodomonas maltophilia all induce the formation of precipitates (7,18,21).…”

Section: Discussionmentioning

confidence: 99%

Chromate Reduction by a Pseudomonad Isolated from a Site Contaminated with Chromated Copper Arsenate

McLean

Beveridge

2001

Appl Environ Microbiol

349

189

View full text Add to dashboard Cite

A pseudomonad (CRB5) isolated from a decommissioned wood preservation site reduced toxic chromate [Cr(VI)] to an insoluble Cr(III) precipitate under aerobic and anaerobic conditions. CRB5 tolerated up to 520 mg of Cr(VI) liter ؊1 and reduced chromate in the presence of copper and arsenate. Under anaerobic conditions it also reduced Co(III) and U(VI), partially internalizing each metal. Metal precipitates were also found on the surface of the outer membrane and (sometimes) on a capsule. The results showed that chromate reduction by CRB5 was mediated by a soluble enzyme that was largely contained in the cytoplasm but also found outside of the cells. ). Minor membrane-associated Cr(VI) reduction under anaerobiosis may account for anaerobic reduction of chromate under nongrowth conditions with an organic electron donor present. Chromate reduction under both aerobic and anaerobic conditions may be a detoxification strategy for the bacterium which could be exploited to bioremediate chromate-contaminated or other toxic heavy metal-contaminated environments.

show abstract

Section: Discussionmentioning

confidence: 99%

Chromate Reduction by a Pseudomonad Isolated from a Site Contaminated with Chromated Copper Arsenate

McLean

Beveridge

2001

Appl Environ Microbiol

349

189

View full text Add to dashboard Cite

show abstract

“…This can aid in the leaching of these contaminants from soils. The bioavailability of heavy metals in soils is a function of its solubility (Ernst, 1996) with pH and organic matter content being the main controlling factors (Gray et al, 1998 , and Cd 2+ (Blake et al, 1993;Park et al, 1999).…”

Section: Transform Toxic Heavy Metalsmentioning

confidence: 99%

Role of soil rhizobacteria in phytoremediation of heavy metal contaminated soils

Jing

2007

J. Zhejiang Univ. - Sci. B

403

159

View full text Add to dashboard Cite

Heavy metal pollution of soil is a significant environmental problem and has its negative impact on human health and agriculture. Rhizosphere, as an important interface of soil and plant, plays a significant role in phytoremediation of contaminated soil by heavy metals, in which, microbial populations are known to affect heavy metal mobility and availability to the plant through release of chelating agents, acidification, phosphate solubilization and redox changes, and therefore, have potential to enhance phytoremediation processes. Phytoremediation strategies with appropriate heavy metal-adapted rhizobacteria have received more and more attention. This article paper reviews some recent advances in effect and significance of rhizobacteria in phytoremediation of heavy metal contaminated soils. There is also a need to improve our understanding of the mechanisms involved in the transfer and mobilization of heavy metals by rhizobacteria and to conduct research on the selection of microbial isolates from rhizosphere of plants growing on heavy metal contaminated soils for specific restoration programmes.

show abstract

“…In addition, some microorganisms may excrete organic compounds which increase bioavailability and facilitate root absorption of essential metals, such as Fe (Crowley et al, 1991) and Mn (Barber and Lee, 1974), as well as nonessential metals, such as Cd (Salt et al, 1995 , and Cd 2+ (Blake et al, 1993;Park et al, 1999). In addition, it has been estimated that microbial reduction of Hg 2+ generates a significant fraction of global atmospheric Hg 0 emissions (Keating et al, 1997).…”

Section: Effect Of Soil Microorganisms On Metal Uptakementioning

confidence: 99%

Phytoextraction of Metals from Contaminated Soil: A Review of Plant/Soil/Metal Interaction and Assessment of Pertinent Agronomic Issues

Lasat¹

1999

Journal of Hazardous Substance Research

241

201

View full text Add to dashboard Cite

Phytoremediation is an emerging technology that employs the use of higher plants for the cleanup of contaminated environments. Fundamental and applied research have unequivocally demonstrated that selected plant species possess the genetic potential to remove, degrade, metabolize, or immobilize a wide range of contaminants. Despite this tremendous potential, phytoremediation is yet to become a commercial technology. Progress in the field is precluded by limited knowledge of basic plant remedial mechanisms. In addition, the effect of agronomic practices on these mechanisms is poorly understood. Another limitation lies within the very biological nature of this novel approach. For example, potential for phytoremediation depends upon the interaction among soil, contaminants, microbes, and plants. This complex interaction, affected by a variety of factors, such as climatic conditions, soil properties, and site hydro-geology, argues against generalization, and in favor of site-specific phytoremediating practices. Thus, an understanding of the basic plant mechanisms and the effect of agronomic practices on plant/soil/contaminant interaction would allow practitioners to optimize phytoremediation by customizing the process to site-specific conditions.Remediation of metal-contaminated soil faces a particular challenge. Unlike organic contaminants, metals cannot be degraded. Commonly, decontamination of metal-contaminated soils requires the removal of toxic metals. Recently, phytoextraction, the use of plants to extract toxic metals from contaminated soils, has emerged as a cost-effective, environment-friendly cleanup alternative. In this paper, we review the processes and mechanisms that allow plants to remove metals from contaminated soils and discuss the effects of agronomic practices on these processes.

show abstract

Chemical Transformation of Toxic Metals by a Pseudomonas Strain From a Toxic Waste Site

Cited by 45 publications

References 0 publications

Chromate Reduction by a Pseudomonad Isolated from a Site Contaminated with Chromated Copper Arsenate

Chromate Reduction by a Pseudomonad Isolated from a Site Contaminated with Chromated Copper Arsenate

Role of soil rhizobacteria in phytoremediation of heavy metal contaminated soils

Phytoextraction of Metals from Contaminated Soil: A Review of Plant/Soil/Metal Interaction and Assessment of Pertinent Agronomic Issues

Contact Info

Product

Resources

About