Simultaneous biodegradation of chloro- and methylthio-s-triazines using charcoal enriched with a newly developed bacterial consortium

Yamazaki, Kaoru; Takagi, Kazuhiro; Fujii, Kunihiko; Iwasaki, Akio; Harada, Naoki; Uchimura, Tai

doi:10.1584/jpestics.g08-08

Cited by 8 publications

(5 citation statements)

References 12 publications

(15 reference statements)

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“…3a). In this situation, co-culturing with bacteria capable of degrading intermediates, such as strain CDB21, is effective for faster and complete degradation (Yamazaki et al 2008b). The coculture with strains ATD6 and CDB21 further degraded cyanuric acid as expected (Fig.…”

Section: Discussionsupporting

confidence: 53%

“…strain MTD22 was capable of decomposing a wide range of s-triazine herbicides and accumulating cyanuric acid (Yamazaki et al 2008a). Incomplete s-triazine-degrading bacteria, such as strain FJ1117YT, often require co-culturing with other degrading bacteria and/or some accompanying bacteria to complete the degradation and utilization of s-triazine compounds for their growth (Yamazaki et al 2008b). The enrichment culture in the current study was, therefore, conducted in the presence of s-triazine-degrading bacterial consortia in expectation of their supporting roles in melamine degradation.…”

Section: Discussionmentioning

confidence: 99%

“…A 10-μL loop of s-triazine-degrading bacteria previously isolated in our laboratory, including strain CDB21 ), strain FJ1117YT , and strain MTD22 (Yamazaki et al 2008a), were inoculated into the perfusion apparatus. Bacteria accompanying the s-triazine-degrading strains, Bradyrhizobium japonicum strain CSB1 (isolated with strain CDB21, Yamazaki et al 2008b) and Hyphomicrobium sp. strain S (isolated with strain MTD22, data not shown), were also included in the inoculum.…”

Section: Enrichment and Isolation Of The Melamine-degrading Bacteriummentioning

confidence: 99%

“…Strains CSB1 and CDB21 comprise the simazine-degrading bacterial consortium CD7 (Yamazaki et al 2008b). Degradation of the intermediates ammeline, ammelide, and cyanuric acid by the three-membered consortium was faster than by the two-membered co-culture (Fig.…”

Section: Degradation Of Melamine By Bacterial Consortiummentioning

confidence: 99%

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Biodegradation of melamine and its hydroxy derivatives by a bacterial consortium containing a novel Nocardioides species

Takagi

Fujii

Yamazaki

et al. 2011

Appl Microbiol Biotechnol

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Melamine has recently been recognized as a food contaminant with adverse human health effects. Melamine contamination in some crops arises from soil and water pollution from various causes. To remove melamine from the polluted environment, a novel bacterium, Nocardioides sp. strain ATD6, capable of degrading melamine was enriched and isolated from a paddy soil sample. The enrichment culture was performed by the soil-charcoal perfusion method in the presence of triazine-degrading bacteria previously obtained. Strain ATD6 degraded melamine and accumulated cyanuric acid and ammonium, via the intermediates ammeline and ammelide. No gene known to encode for triazine-degrading enzymes was detected in strain ATD6. A mixed culture of strain ATD6 and a simazine-degrading Methyloversatilis sp. strain CDB21 completely degraded melamine, but the degradation rate of cyanuric acid was slow. The degradation of melamine and its catabolites by the mixed culture was greatly enhanced by including Bradyrhizobium japonicum strain CSB1 in the inoculum and adding ethanol to the culture medium. The melamine-degrading consortium consisting of strains ATD6, CDB21, and CSB1 appears to be potentially safer than other known melamine-degrading bacteria for the bioremediation of farmland and other contaminated sites, as no known pathogens were included in the consortium.

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Section: Discussionsupporting

confidence: 53%

Section: Discussionmentioning

confidence: 99%

Section: Enrichment and Isolation Of The Melamine-degrading Bacteriummentioning

confidence: 99%

Section: Degradation Of Melamine By Bacterial Consortiummentioning

confidence: 99%

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Biodegradation of melamine and its hydroxy derivatives by a bacterial consortium containing a novel Nocardioides species

Takagi

Fujii

Yamazaki

et al. 2011

Appl Microbiol Biotechnol

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“…CD7w , and β‐Proteobacteria CDB21 was found capable of degrading chloro‐s‐triazines (simazine and atrazine) and methylthio‐s‐triazines (simetryn and dimethametryn) over 4‐ and 9‐day cultivation period, respectively. The mineralization occurred via the herbicide’s 2‐hydroxy 13 analogues (Yamazaki et al, 2008).…”

Section: Introductionmentioning

confidence: 99%

Immobilized algae‐based treatment of herbicide‐contaminated groundwater

Mollamohammada

Hassan

Dahab

2020

Water Environment Research

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Scenedesmus species, immobilized on alginate gel, was found effective in removing nitrate, atrazine, magnesium, phosphorus, zinc, oxadiazon, and triallate from groundwater in a continuous flow reactor. The laboratory‐scale experiments with synthetic groundwater, made of 8.8 mg/L NO3‐N and 90 µg/L atrazine, were performed at a hydraulic retention time of 7 days and the temperatures of 20 and 35°C. The highest uptake of nitrate and atrazine was observed at 20°C (97% and 70%, respectively). When tested in actual groundwater, 92% of nitrate, 100% of magnesium, 99.9% of phosphorus, and 92% of zinc were successfully removed at the end of 29 days’ treatment operations. The algal beads removed 100% of oxadiazon and triallate in the first 10 days, but some of the herbicides diffused back into the solution toward the end of the treatment process. Practitioner points Immobilized algae–alginate beads can remove nitrate, atrazine, oxadiazon, and triallate from groundwater in continuous flow reactor. The uptake rate of nitrate and atrazine is higher in room temperature (20°C). Same algae beads could be reused for herbicide uptake for the average of 10 days. The immobilized system is a natural sustainable alternative that can be used in groundwater pump and treat.

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Mineralization of melamine and cyanuric acid as sole nitrogen source by newly isolated Arthrobacter spp. using a soil-charcoal perfusion method

Hatakeyama

Takagi

Yamazaki

et al. 2015

World J Microbiol Biotechnol

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Melamine belongs to the s-triazine family, and industrially used as raw product in many ways all over the world. Melamine has been reported for human harmful effects and detected from some crops, soil and water. To remove melamine from the polluted environment, the efficient melamine-mineralizing microorganisms have been needed. We newly isolated three melamine-degrading bacteria from the same upland soil sample using soil-charcoal perfusion method. These bacteria were classified as Arthrobacter sp. MCO, Arthrobacter sp. CSP and Microbacterium sp. ZEL by 16S rRNA genes sequencing analysis. Both Arthrobacter species completely degraded melamine within 2 days, and consumed melamine as a sole nitrogen source. Both strains also grew in cyanuric acid as sole nitrogen source, and released small quantities of ammonium ions. These strains are the first identified bacteria that can mineralize both melamine and cyanuric acid as sole initial nitrogen source in Arthrobacter sp. Although ammeline and ammelide intermediates were detected, these strains possess none of the known genes encoding melamine degrading enzymes. Since the Arthrobacter strains also degraded melamine in a high pH liquid medium, they present as potential bioremediation agents in melamine-polluted environments.

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Simultaneous biodegradation of chloro- and methylthio-s-triazines using charcoal enriched with a newly developed bacterial consortium

Cited by 8 publications

References 12 publications

Biodegradation of melamine and its hydroxy derivatives by a bacterial consortium containing a novel Nocardioides species

Biodegradation of melamine and its hydroxy derivatives by a bacterial consortium containing a novel Nocardioides species

Immobilized algae‐based treatment of herbicide‐contaminated groundwater

Mineralization of melamine and cyanuric acid as sole nitrogen source by newly isolated Arthrobacter spp. using a soil-charcoal perfusion method

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