In Situ Biotransformation of Contaminants in Sediments

Himmelheber, David W.; Hughes, Joseph B.

doi:10.1007/978-1-4614-6726-7_10

Cited by 5 publications

(4 citation statements)

References 176 publications

(201 reference statements)

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“…Several reasons were given for the no detection of methylation, thus the fast demethylation process could account for the degradation of the generated MeHg before it could be detected being the Hg 0 the main product of demethylation. Similar mechanisms based on two enzymes have been reported in new studies focused on the biotransformation of pollutants such as Hg (Himmelheber and Hughes, 2014;Yu et al, 2016). Thus, reductive demethylation via Hg resistance (mer) operon would also occur by the action of organomercurial lyase (merB) followed by mercuric reductase (merA).…”

Section: Ruminants and Other Herbivorous Vertebratesmentioning

confidence: 77%

Is gastrointestinal microbiota relevant for endogenous mercury methylation in terrestrial animals?

Martín-Doimeadios

Mateo

Jiménez-Moreno

2017

Environmental Research

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Section: Ruminants and Other Herbivorous Vertebratesmentioning

confidence: 77%

Is gastrointestinal microbiota relevant for endogenous mercury methylation in terrestrial animals?

Martín-Doimeadios

Mateo

Jiménez-Moreno

2017

Environmental Research

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“…Bio-leaching, bio-venting, phyto-remediation, phyto-extraction, phyto-stabilization, bio-sorption, phyto-volatilization, rhizofilteration, phyto-degradation are few other biological treatment methods that transform or degrade streambed contaminants into non-toxic form [118,212,213]. The drawbacks of chemical and biological techniques include uncertain reaction rates, factors that suppress microbial activity, problems in delivery of necessary oxidant/ bacteria or fungi/solvent materials to polluted zones, yield of an inert end-product and uncertainties in application of new technology [214].…”

Section: Chemical and Biotechnological Measuresmentioning

confidence: 99%

Streambed pollution: A comprehensive review of its sources, eco-hydro-geo-chemical impacts, assessment, and mitigation strategies

Mohanavelu¹,

Shrivastava²,

Naganna³

2021

Preprint

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Streambeds are among the important components of stream ecosystems and support several critical ecosystem services such as transformation of organic matter and nutrients and provide habitat for aquatic organisms. Increasing anthropogenic influence introduces multiple stressors to the stream networks resulting in pollution of streambeds, which in turn, could have detrimental effects on overall stream ecosystem health. However, there are gaps in the current understanding of the impacts of streambed pollution and the mitigation strategies lack holistic approach. In this review, we first present a global inventory to highlight the status of streambed pollution around the globe. Next, we synthesize the state-of-art knowledge of conventional and emerging forms of contaminants, their overall impacts on stream ecosystem functions, and finally present future directions to comprehend the problem of streambed pollution. We highlight that fine sediments and plastics (found especially in urban streambeds) are among the major physical pollutants of streambed pollution and the chemical pollutants generally comprise of hydrophobic compounds including various legacy contaminants such as polychlorinated biphenyl (PCB), dichlorodiphenyltrichloroethane (DDT), a wide range of pesticides and a variety of heavy metals. Further, in recent years, highly polar and hydrophilic emerging contaminants such as micro-plastics, pharmaceutical waste and personal care products have been identified in rivers around the world. We stress that the impacts of streambed pollution have been largely studied with discipline-driven perspectives amongst which the ecological impacts have received a lot of attention in the past. To present a comprehensive outlook, this review also synthesizes the hydrological, geomorphological and biochemical impacts of different forms of streambed pollutants. In the end, we endorse the positive and negative aspects of the current impact assessment methodologies and also highlight various physical, chemical and biological remediation measures that could be applied to alleviate streambed pollution.

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“…). The management of contaminated sediments greatly depends on natural or enhanced biodegradation processes (Himmelheber and Hughes ). The molecular analysis of key genes related to pollutant biodegradation can provide valuable information concerning the presence or activity of the microbial populations responsible for the removal of environmental contaminants.…”

Section: Introductionmentioning

confidence: 99%

“…Due to their hydrophobic nature and slow biodegradability, these compounds accumulate in sediments and in some marine organisms, where they can elicit adverse effects on both human and environmental health (Nikolaou et al 2009). The management of contaminated sediments greatly depends on natural or enhanced biodegradation processes (Himmelheber and Hughes 2014). The molecular analysis of key genes related to pollutant biodegradation can provide valuable information concerning the presence or activity of the microbial populations responsible for the removal of environmental contaminants.…”

Section: Introductionmentioning

confidence: 99%

Metagenomics reveals the high polycyclic aromatic hydrocarbon-degradation potential of abundant uncultured bacteria from chronically polluted subantarctic and temperate coastal marine environments

et al. 2015

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Aims: To investigate the potential to degrade polycyclic aromatic hydrocarbons (PAHs) of yet-to-be cultured bacterial populations from chronically-polluted intertidal sediments. Methods and Results:A gene variant encoding the alpha subunit of the catalytic component of an aromatic ring-hydroxylating oxygenase (RHO) was abundant in intertidal sediments from chronically-polluted subantarctic and temperate coastal environments, and its abundance increased after PAH amendment. Conversely, this marker gene was not detected in sediments from a non-impacted site, even after a short-term PAH exposure. A metagenomic fragment carrying this gene variant was identified in a fosmid library of subantarctic sediments. This fragment contained five pairs of alpha and beta subunit genes and a lone alpha subunit gene of oxygenases, classified as belonging to three different RHO functional classes. In silico structural analysis suggested that two of these oxygenases contain large substrate-binding pockets, capable of accepting high molecular weight PAHs. Conclusions:The identified uncultured microorganism presents the potential to degrade aromatic hydrocarbons with various chemical structures, and could represent an important member of the PAH-degrading community in these polluted coastal environments. Accepted ArticleThis article is protected by copyright. All rights reserved. Significance and Impact of Study:This work provides valuable information for the design of environmental molecular diagnostic tools and for the biotechnological application of RHO enzymes.

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In Situ Biotransformation of Contaminants in Sediments

Cited by 5 publications

References 176 publications

Is gastrointestinal microbiota relevant for endogenous mercury methylation in terrestrial animals?

Is gastrointestinal microbiota relevant for endogenous mercury methylation in terrestrial animals?

Streambed pollution: A comprehensive review of its sources, eco-hydro-geo-chemical impacts, assessment, and mitigation strategies

Metagenomics reveals the high polycyclic aromatic hydrocarbon-degradation potential of abundant uncultured bacteria from chronically polluted subantarctic and temperate coastal marine environments

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