Reductive deamination as a new step in the anaerobic microbial degradation of halogenated anilines

Travkin, Vasilii M

doi:10.1016/s0378-1097(02)00563-3

Cited by 2 publications

(2 citation statements)

References 13 publications

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“…Under anoxic conditions other processes such as reductive deamination or dehalogenation may initiate the degradation of aniline metabolites (e.g. [61]). Aniline compounds may also undergo spontaneous chemical reactions to form various polymerisation products [35,41].…”

Section: Metabolic Pathways For Phenylurea Herbicide Biodegradationmentioning

confidence: 99%

Microbial degradation of isoproturon and related phenylurea herbicides in and below agricultural fields

Sørensen

Bending²,

Jacobsen

et al. 2003

FEMS Microbiology Ecology

204

155

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The phenylurea herbicides are an important group of pesticides used extensively for pre- or post-emergence weed control in cotton, fruit and cereal crops worldwide. The detection of phenylurea herbicides and their metabolites in surface and ground waters has raised the awareness of the important role played by agricultural soils in determining water quality. The degradation of phenylurea herbicides following application to agricultural fields is predominantly microbial. However, evidence suggests a slow degradation of the phenyl ring, and substantial spatial heterogeneity in the distribution of active degradative populations, which is a key factor determining patterns of leaching losses from agricultural fields. This review summarises current knowledge on the microbial metabolism of isoproturon and related phenylurea herbicides in and below agricultural soils. It addresses topics such as microbial degradation of phenylurea herbicides in soil and subsurface environments, characteristics of known phenylurea-degrading soil micro-organisms, and similarities between metabolic pathways for different phenylurea herbicides. Finally, recent studies in which molecular and microbiological techniques have been used to provide insight into the in situ microbial metabolism of isoproturon within an agricultural field will be discussed.

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Section: Metabolic Pathways For Phenylurea Herbicide Biodegradationmentioning

confidence: 99%

Microbial degradation of isoproturon and related phenylurea herbicides in and below agricultural fields

Sørensen

Bending²,

Jacobsen

et al. 2003

FEMS Microbiology Ecology

204

155

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“…Rhodococcus species have variable abilities to reduce nitrate, and some have been shown to grow and/or degrade specific compounds under denitrifying conditions (Yoon et al. 2000; Travkin et al. 2002; Ngugi et al.…”

Section: Discussionmentioning

confidence: 99%

Microaerophilic degradation of hexahydro-1,3,5-trinitro-1,3,5-triazine (RDX) by three Rhodococcus strains

Fuller¹,

Perreault

Hawari

2010

Letters in Applied Microbiology

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Aim: The goal of this study was to compare the degradation of hexahydro‐1,3,5‐trinitro‐1,3,5‐triazine (RDX) by three Rhodococcus strains under anaerobic, microaerophilic (<0·04 mg l−1 dissolved oxygen) and aerobic (dissolved oxygen (DO) maintained at 8 mg l−1) conditions. Methods and Results: Three Rhodococcus strains were incubated with no, low and ambient concentrations of oxygen in minimal media with succinate as the carbon source and RDX as the sole nitrogen source. RDX and RDX metabolite concentrations were measured over time. Under microaerophilic conditions, the bacteria degraded RDX, albeit about 60‐fold slower than under fully aerobic conditions. Only the breakdown product, 4‐nitro‐2,4‐diazabutanal (NDAB) accumulated to measurable concentrations under microaerophilic conditions. RDX degraded quickly under both aerated and static aerobic conditions (DO allowed to drop below 1 mg l−1) with the accumulation of both NDAB and methylenedinitramine (MEDINA). No RDX degradation was observed under strict anaerobic conditions. Conclusions: The Rhodococcus strains did not degrade RDX under strict anaerobic conditions, while slow degradation was observed under microaerophilic conditions. The RDX metabolite NDAB was detected under both microaerophilic and aerobic conditions, while MEDINA was detected only under aerobic conditions. Impact and Significance of the Study: This work confirmed the production of MEDINA under aerobic conditions, which has not been previously associated with aerobic RDX degradation by these organisms. More importantly, it demonstrated that aerobic rhodococci are able to degrade RDX under a broader range of oxygen concentrations than previously reported.

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Reductive deamination as a new step in the anaerobic microbial degradation of halogenated anilines

Cited by 2 publications

References 13 publications

Microbial degradation of isoproturon and related phenylurea herbicides in and below agricultural fields

Microbial degradation of isoproturon and related phenylurea herbicides in and below agricultural fields

Microaerophilic degradation of hexahydro-1,3,5-trinitro-1,3,5-triazine (RDX) by three Rhodococcus strains

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