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Yang H, Liu S, Chen S, Lu P, Huang J, Sun L, Liu H. Novel 4-chlorophenoxyacetate dioxygenase-mediated phenoxyalkanoic acid herbicides initial catabolism in Cupriavidus sp. DL-D2. JOURNAL OF HAZARDOUS MATERIALS 2024; 478:135427. [PMID: 39116741 DOI: 10.1016/j.jhazmat.2024.135427] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/26/2024] [Revised: 08/01/2024] [Accepted: 08/02/2024] [Indexed: 08/10/2024]
Abstract
Microbial metabolism is an important driving force for the elimination of 4-chlorophenoxyacetic acid residues in the environment. The α-Ketoglutarate-dependent dioxygenase (TfdA) or 2,4-D oxygenase (CadAB) catalyzes the cleavage of the aryl ether bond of 4-chlorophenoxyacetic acid to 4-chlorophenol, which is one of the important pathways for the initial metabolism of 4-chlorophenoxyacetic acid by microorganisms. However, strain Cupriavidus sp. DL-D2 could utilize 4-chlorophenoxyacetic acid but not 4-chlorophenol for growth. This scarcely studied degradation pathway may involve novel enzymes that has not yet been characterized. Here, a gene cluster (designated cpd) responsible for the catabolism of 4-chlorophenoxyacetic acid in strain DL-D2 was cloned and identified, and the dioxygenase CpdA/CpdB responsible for the initial degradation of 4-chlorophenoxyacetic acid was successfully expressed, which could catalyze the conversion of 4-chlorphenoxyacetic acid to 4-chlorocatechol. Then, an aromatic cleavage enzyme CpdC further converts 4-chlorocatechol into 3-chloromuconate. The results of substrate degradation experiments showed that CpdA/CpdB could also degrade 3-chlorophenoxyacetic acid and phenoxyacetic acid, and homologous cpd gene clusters were widely discovered in microbial genomes. Our findings revealed a novel degradation mechanism of 4-chlorophenoxyacetic acid at the molecular level.
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Affiliation(s)
- Hao Yang
- The Anhui Provincial Key Laboratory of Biodiversity Conservation and Ecological Security in the Yangtze River Basin, Anhui Normal University, Wuhu 241000, Anhui, PR China; Anhui Provincial Key Laboratory of Molecular Enzymology and Mechanism of Major Metabolic Diseases, College of Life Sciences, Anhui Normal University, Wuhu 241000, Anhui, PR China
| | - Shiyan Liu
- The Anhui Provincial Key Laboratory of Biodiversity Conservation and Ecological Security in the Yangtze River Basin, Anhui Normal University, Wuhu 241000, Anhui, PR China; Anhui Provincial Key Laboratory of Molecular Enzymology and Mechanism of Major Metabolic Diseases, College of Life Sciences, Anhui Normal University, Wuhu 241000, Anhui, PR China
| | - Sitong Chen
- The Anhui Provincial Key Laboratory of Biodiversity Conservation and Ecological Security in the Yangtze River Basin, Anhui Normal University, Wuhu 241000, Anhui, PR China; Anhui Provincial Key Laboratory of Molecular Enzymology and Mechanism of Major Metabolic Diseases, College of Life Sciences, Anhui Normal University, Wuhu 241000, Anhui, PR China
| | - Peng Lu
- The Anhui Provincial Key Laboratory of Biodiversity Conservation and Ecological Security in the Yangtze River Basin, Anhui Normal University, Wuhu 241000, Anhui, PR China; Anhui Provincial Key Laboratory of Molecular Enzymology and Mechanism of Major Metabolic Diseases, College of Life Sciences, Anhui Normal University, Wuhu 241000, Anhui, PR China
| | - Junwei Huang
- College of Resources and Environment, Anhui Agricultural University, Anhui Provincial Key Laboratory of Hazardous Factors and Risk Control of Agri-food Quality Safety, Hefei 230036, PR China
| | - Lina Sun
- Eco-Environmental Protection Research Institute, Shanghai Academy of Agricultural Sciences, Shanghai 201403, PR China.
| | - Hongming Liu
- The Anhui Provincial Key Laboratory of Biodiversity Conservation and Ecological Security in the Yangtze River Basin, Anhui Normal University, Wuhu 241000, Anhui, PR China; Anhui Provincial Key Laboratory of Molecular Enzymology and Mechanism of Major Metabolic Diseases, College of Life Sciences, Anhui Normal University, Wuhu 241000, Anhui, PR China.
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Tang Y, Zhai Q, Zhang Z, Lu Z, Li R, Zhang H. Exploration of the biodegradation pathway and enhanced removal of imazethapyr from soil by immobilized Bacillus marcorestinctum YN1. CHEMOSPHERE 2024; 351:141178. [PMID: 38218236 DOI: 10.1016/j.chemosphere.2024.141178] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/14/2023] [Revised: 11/21/2023] [Accepted: 01/08/2024] [Indexed: 01/15/2024]
Abstract
Excessive or inappropriate applications of imazethapyr cause severe ecological deteriorations and health risks in human. A novel bacterial strain, i.e., Bacillus marcorestinctum YN1, was isolated to efficiently degrade imazethapyr, with the degradation pathways and intermediates predicted. Protein mass spectrometry analysis identified enzymes in strain YN1 potentially involved in imazethapyr biodegradation, including methylenetetrahydrofolate dehydrogenase, carbon-nitrogen family hydrolase, heme degrading monooxygenase, and cytochrome P450. The strain YN1 was further immobilized with biochar (BC600) prepared from mushroom waste (i.e., spent mushroom substrate) by pyrolysis at 600 °C to evaluate its degrading characteristics of imazethapyr. Scanning electron microscope observation showed that strain YN1 was adsorbed in the rich pore structure of BC600 and the adsorption efficiency reached the maximum level of 88.02% in 6 h. Both energy dispersive X-ray and Fourier transform infrared spectroscopy analyses showed that BC600 contained many elements and functional groups. The results of liquid chromatography showed that biochar-immobilized strain YN1 (IBC-YN1) improved the degradation rate of imazethapyr from 79.2% to 87.4%. The degradation rate of imazethapyr by IBC-YN1 could still reach 81.0% in the third recycle, while the bacterial survival rate was 67.73% after 180 d storage at 4 °C. The treatment of IBC-YN1 significantly shortened the half-life of imazethapyr in non-sterilized soil from 35.51 to 11.36 d, and the vegetative growth of imazethapyr sensitive crop plant (i.e., Cucumis sativus L.) was significantly increased in soil remediated, showing that the inhibition rate of root length and fresh weight were decreased by 12.45% and 38.49% respectively. This study exhanced our understanding of microbial catabolism of imazethapyr, and provided a potential in situ remediation strategy for improving the soil environment polluted by imazethapyr.
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Affiliation(s)
- Yanan Tang
- College of Plant Protection, Jilin Agricultural University, Changchun, 130118, China.
| | - Qianhang Zhai
- College of Plant Protection, Jilin Agricultural University, Changchun, 130118, China.
| | - Zhengyi Zhang
- College of Plant Protection, Jilin Agricultural University, Changchun, 130118, China.
| | - Zhou Lu
- Laboratory of Quality & Safety Risk Assessment for Ginseng and Antler Products (Changchun), Ministry of Agricultural and Rural Affairs of PR China, Jilin Agricultural University, Changchun, 130118, China.
| | - Ranhong Li
- College of Plant Protection, Jilin Agricultural University, Changchun, 130118, China.
| | - Hao Zhang
- College of Plant Protection, Jilin Agricultural University, Changchun, 130118, China.
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Li S, Geng Y, Bao C, Mei Q, Shi T, Ma X, Hua R, Fang L. Complete biodegradation of fungicide carboxin and its metabolite aniline by Delftia sp. HFL-1. THE SCIENCE OF THE TOTAL ENVIRONMENT 2024; 912:168957. [PMID: 38030002 DOI: 10.1016/j.scitotenv.2023.168957] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/17/2023] [Revised: 11/26/2023] [Accepted: 11/26/2023] [Indexed: 12/01/2023]
Abstract
Fungicide carboxin was commonly used in the form of seed coating for the prevention of smut, wheat rust and cotton damping-off, leading carboxin and its probable carcinogenic metabolite aniline to directly enter the soil with the seeds, causing residual pollution. In this study, a novel carboxin degrading strain, Delftia sp. HFL-1, was isolated. Strain HFL-1 could use carboxin as the carbon source for growth and completely degrade 50 mg/L carboxin and its metabolite aniline within 24 h. The optimal temperatures and pH for carboxin degrading by strain HFL-1 were 30 to 42 °C and 5 to 9, respectively. Furthermore, the complete mineralization pathway of carboxin by strain HFL-1 was revealed by High Resolution Mass Spectrometer (HRMS). Carboxin was firstly hydrolyzed into aniline and further metabolized into catechol through multiple oxidation processes, and finally converted into 4-hydroxy-2-oxopentanoate, a precursor of the tricarboxylic acid cycle. Genome sequencing revealed the corresponding degradation genes and cluster of carboxin. Among them, amidohydrolase and dioxygenase were key enzymes involved in the degradation of carboxin and aniline. The discovery of transposons indicated that the aniline degradation gene cluster in strain HFL-1 was obtained via horizontal transfer. Furthermore, the degradation genes were cloned and overexpressed. The in vitro test showed that the expressed degrading enzyme could efficiently degrade aniline. This study provides an efficient strain resource for the bioremediation of carboxin and aniline in contaminated soil, and further revealing the molecular mechanism of biodegradation of carboxin and aniline.
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Affiliation(s)
- Shengyang Li
- Anhui Provincial Key Laboratory for Quality and Safety of Agri-Products, School of Resource & Environment, Anhui Agricultural University, Hefei, Anhui 230036, China
| | - Yuehan Geng
- Anhui Provincial Key Laboratory for Quality and Safety of Agri-Products, School of Resource & Environment, Anhui Agricultural University, Hefei, Anhui 230036, China
| | - Chengwei Bao
- Anhui Provincial Key Laboratory for Quality and Safety of Agri-Products, School of Resource & Environment, Anhui Agricultural University, Hefei, Anhui 230036, China
| | - Quyang Mei
- Anhui Provincial Key Laboratory for Quality and Safety of Agri-Products, School of Resource & Environment, Anhui Agricultural University, Hefei, Anhui 230036, China
| | - Taozhong Shi
- Anhui Provincial Key Laboratory for Quality and Safety of Agri-Products, School of Resource & Environment, Anhui Agricultural University, Hefei, Anhui 230036, China
| | - Xin Ma
- Anhui Provincial Key Laboratory for Quality and Safety of Agri-Products, School of Resource & Environment, Anhui Agricultural University, Hefei, Anhui 230036, China
| | - Rimao Hua
- Anhui Provincial Key Laboratory for Quality and Safety of Agri-Products, School of Resource & Environment, Anhui Agricultural University, Hefei, Anhui 230036, China; Institute for Green Development, Anhui Agricultural University, Hefei, Anhui 230036, China
| | - Liancheng Fang
- Anhui Provincial Key Laboratory for Quality and Safety of Agri-Products, School of Resource & Environment, Anhui Agricultural University, Hefei, Anhui 230036, China; Institute for Green Development, Anhui Agricultural University, Hefei, Anhui 230036, China.
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Zhao W, Yang H, Huang Y, Fan X, Tong Z. Genomic Sequencing of Clinical Cupriavidus gilardii Isolates Revealed Their Diverse Antimicrobial Resistance Mechanisms. Infect Drug Resist 2024; 17:655-664. [PMID: 38379587 PMCID: PMC10878315 DOI: 10.2147/idr.s438328] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/02/2023] [Accepted: 01/26/2024] [Indexed: 02/22/2024] Open
Abstract
Purpose Cupriavidus gilardii is an emerging multidrug-resistant pathogen found in many environments and few clinical samples. The clinical infectiousness, pathogenicity, and resistance mechanisms of C. gilardii are still unclear due to the lack of clinical and sequencing data. We need to obtain insight into the clinical characteristics, virulence, and resistance mechanisms of C. gilardii. Patients and Methods We isolated five C. gilardii isolates from hospitalized patients and carried out assay, culture and genome sequencing. We analyzed the genomic features of clinical C. gilardii isolates and took insight into their clinical characteristics, virulence, and resistance mechanisms. Results These isolates were resistant to meropenem, gentamicin, and other antimicrobials due to intrinsic resistance genes. Furthermore, the sequencing results revealed the widespread presence of the MCR-5.1 gene in C. gilardii. The virulence magnitude of C. gilardii is closely correlated with the number of virulence factors they carry. Some C. gilardii strains can acquire resistance to levofloxacin through gyrA gene mutation during treatment. The diverse antimicrobial resistance mechanisms challenge the treatment of C. gilardii infections. Conclusion We present the genomic characteristics of clinically isolated C. gilardii to improve (i) our understanding of this pathogen and (ii) treatment options.
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Affiliation(s)
- Weichao Zhao
- Department of Respiratory and Critical Care Medicine, Beijing Institute of Respiratory Medicine, Beijing Chao-Yang Hospital, Capital Medical University, Beijing, People’s Republic of China
- Department of Respiratory Medicine, Strategic Support Force Medical Center, Beijing, People’s Republic of China
| | - Huqin Yang
- Department of Respiratory and Critical Care Medicine, Beijing Institute of Respiratory Medicine, Beijing Chao-Yang Hospital, Capital Medical University, Beijing, People’s Republic of China
| | - Yong Huang
- State Key Laboratory of Pathogen and Biosecurity, Beijing Institute of Microbiology and Epidemiology, Beijing, People’s Republic of China
| | - Xin Fan
- Department of Infectious Diseases and Clinical Microbiology, Beijing Institute of Respiratory Medicine, Beijing Chao-Yang Hospital, Capital Medical University, Beijing, People’s Republic of China
| | - Zhaohui Tong
- Department of Respiratory and Critical Care Medicine, Beijing Institute of Respiratory Medicine, Beijing Chao-Yang Hospital, Capital Medical University, Beijing, People’s Republic of China
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Wilms W, Woźniak-Karczewska M, Niemczak M, Parus A, Frankowski R, Wolko Ł, Czarny J, Piotrowska-Cyplik A, Zgoła-Grześkowiak A, Heipieper HJ, Chrzanowski Ł. 2,4-D versus 2,4-D based ionic liquids: Effect of cation on herbicide biodegradation, tfdA genes abundance and microbiome changes during soil bioaugmentation. JOURNAL OF HAZARDOUS MATERIALS 2023; 452:131209. [PMID: 36940526 DOI: 10.1016/j.jhazmat.2023.131209] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/20/2022] [Revised: 02/22/2023] [Accepted: 03/12/2023] [Indexed: 05/03/2023]
Abstract
The commercial formulations of herbicides rely on surfactants which increase the efficiency of active substance. Herbicidal ionic liquids (ILs), in which cationic surfactants are combined with herbicidal anions, allow for additives' reduction and ensure very good herbicide performance with lower doses. We aimed to test the impact of synthetic and natural cations on biological degradation of 2,4-dichlorophenoxyacetic acid (2,4-D). Although primary biodegradation was high, the mineralization in agricultural soil indicated incomplete conversion of ILs to CO2. Even the introduction of naturally-derived cations resulted in an increase in the herbicide's half-lives - from 32 days for [Na][2,4-D] to 120 days for [Chol][2,4-D] and 300 days for the synthetic tetramethylammonium derivative [TMA][2,4-D]. Bioaugmentation with 2,4-D-degrading strains improves the herbicides' degradation, which was reflected by higher abundance of tfdA genes. Microbial community analysis confirmed that hydrophobic cationic surfactants, even those based on natural compounds, played a negative role on microbial biodiversity. Our study provides a valuable indication for further research related to the production of a new generation of environmentally friendly compounds. Moreover, the results shed a new light on the ionic liquids as independent mixtures of ions in the environment, as opposed to treating them as new type of environmental pollutants.
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Affiliation(s)
- Wiktoria Wilms
- Department of Chemical Technology, Poznan University of Technology, 60-965 Poznan, Poland
| | | | - Michał Niemczak
- Department of Chemical Technology, Poznan University of Technology, 60-965 Poznan, Poland
| | - Anna Parus
- Department of Chemical Technology, Poznan University of Technology, 60-965 Poznan, Poland
| | - Robert Frankowski
- Department of Chemical Technology, Poznan University of Technology, 60-965 Poznan, Poland
| | - Łukasz Wolko
- Department of Biochemistry and Biotechnology, Poznan University of Life Sciences, Dojazd 11, 60-632 Poznan, Poland
| | - Jakub Czarny
- Institute of Forensic Genetics, Al. Mickiewicza 3/4, 85-071 Bydgoszcz, Poland
| | - Agnieszka Piotrowska-Cyplik
- Department of Food Technology of Plant Origin, Poznan University of Life Sciences, Wojska Polskiego 31, 60-624 Poznan, Poland
| | | | - Hermann J Heipieper
- Department of Environmental Biotechnology, Helmholtz Centre for Environmental Research - UFZ, Permoserstraße 15, 04318 Leipzig, Germany
| | - Łukasz Chrzanowski
- Department of Chemical Technology, Poznan University of Technology, 60-965 Poznan, Poland; Department of Environmental Biotechnology, Helmholtz Centre for Environmental Research - UFZ, Permoserstraße 15, 04318 Leipzig, Germany
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Zhang X, Geng K, Wu N, Hu G, Fan B, He J, Qiao W. Sustained anaerobic degradation of 4-chloro-2-methylphenoxyacetic acid by acclimated sludge in a continuous-flow reactor. CHEMOSPHERE 2023; 330:138749. [PMID: 37086982 DOI: 10.1016/j.chemosphere.2023.138749] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/20/2023] [Revised: 04/19/2023] [Accepted: 04/20/2023] [Indexed: 05/03/2023]
Abstract
4-Chloro-2-methylphenoxyacetic acid (MCPA) is a widely used herbicide across the world. MCPA is persistent and easily transports into anoxic environment, such as groundwater, sediments and deep soils. However, little research on anaerobic microbial degradation of MCPA was carried out. The functional microorganisms as well as the catabolic pathway are still unknown. In this research, an anaerobic MCPA-degrading bacterial consortium was enriched from the river sediment near a pesticide-manufacturing plant. After about 6 months' acclimation, the MCPA transformation rate of the consortium reached 4.32 μmol g-1 day-1, 25 times faster than that of the original sludge. 96% of added MCPA (2.5 mM) was degraded within 9 d of incubation. Three metabolites including 4-chloro-2-methylphenol (MCP), 2-methylphenol (2-MP) and phenol were identified during the anaerobic degradation of MCPA. An anaerobic catabolic pathway was firstly proposed: firstly, MCPA was transformed to MCP via the cleavage of the aryl ether, then MCP was reductively dechlorinated to 2-MP which was further demethylated to phenol. The 16S rRNA gene amplicon sequencing revealed a substantial shift in the bacterial community composition after the acclimation. SBR1031, Acidaminococcaceae, Aminicenantales, Syntrophorhabdus, Acidaminobacter, Bacteroidetes_vadinHA17, Methanosaeta, Bathyarchaeia, KD4-96, Anaeromyxobacter, and Dehalobacter were significantly increased in the enriched consortium after acclimation, and positively correlated with the anaerobic degradation of MCPA as suggested by heat map correlation analysis. This study provides a basis for further elucidation of the anaerobic catabolism of MCPA, and contributes to developing efficient and low-cost anaerobic treatment technologies for MCPA pollution.
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Affiliation(s)
- Xuan Zhang
- Department of Microbiology, College of Life Sciences, Nanjing Agricultural University, Key Laboratory of Agricultural and Environmental Microbiology, Ministry of Agriculture and Rural Affairs, Nanjing, 210095, China
| | - Keke Geng
- Department of Microbiology, College of Life Sciences, Nanjing Agricultural University, Key Laboratory of Agricultural and Environmental Microbiology, Ministry of Agriculture and Rural Affairs, Nanjing, 210095, China
| | - Ningning Wu
- Department of Microbiology, College of Life Sciences, Nanjing Agricultural University, Key Laboratory of Agricultural and Environmental Microbiology, Ministry of Agriculture and Rural Affairs, Nanjing, 210095, China
| | - Gang Hu
- Laboratory Centre of Life Science, College of Life Science, Nanjing Agricultural University, Nanjing, Jiangsu, 210095, PR China
| | - Ben Fan
- College of Forest Resources and Environment, Nanjing Forestry University, Nanjing, Jiangsu, 210037, PR China
| | - Jian He
- Department of Microbiology, College of Life Sciences, Nanjing Agricultural University, Key Laboratory of Agricultural and Environmental Microbiology, Ministry of Agriculture and Rural Affairs, Nanjing, 210095, China
| | - Wenjing Qiao
- Department of Microbiology, College of Life Sciences, Nanjing Agricultural University, Key Laboratory of Agricultural and Environmental Microbiology, Ministry of Agriculture and Rural Affairs, Nanjing, 210095, China.
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Birolli WG, da Silva BF, Rodrigues Filho E. Biodegradation of the pyrethroid cypermethrin by bacterial consortia collected from orange crops. ENVIRONMENTAL RESEARCH 2022; 215:114388. [PMID: 36152890 DOI: 10.1016/j.envres.2022.114388] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/12/2022] [Revised: 09/15/2022] [Accepted: 09/17/2022] [Indexed: 06/16/2023]
Abstract
Pyrethroids, such as cypermethrin (CYP), are widely employed in agriculture, promoting environmental pollution and the need for efficient decontamination methods. In this study, bacteria from orange crops were explored for CYP biodegradation. Among 40 tested bacterial strains, 20 grew in the presence of CYP and 19 performed statistically significant CYP biodegradation in 5 days (20.5%-97.8%). In addition, 3-phenoxybenzoic acid, the main metabolite from CYP, was quantified ranging from 1.1 mg.L-1 to 32.1 mg.L-1. The five most efficient strains, and consortia composed of 5, 10 and 20 bacteria biodegraded the CYP formulation as sole carbon source in phosphate buffer and in minimum mineral medium. Under optimized conditions determined employing Response Surface Methodology, Bacillus sp. CSA-1 and the consortium composed of 10 strains biodegraded 71.0% and 71.6% CYP in 24 h, respectively. Moreover, metabolite identification enabled the proposal of an extended biodegradation pathway with 29 identified compounds, including different new amide and amine derivatives that expanded the knowledge about the fate of this compound in the environment. Experiments of bioaugmentation in soil using Bacillus sp. CSA-1 and the consortium of 10 bacterial strains resulted in faster CYP biodegradation than natural attenuation, showing that the selection of efficient strains for composing a consortium is an interesting approach for bioremediation of pyrethroids.
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Affiliation(s)
- Willian Garcia Birolli
- Laboratory of Micromolecular Biochemistry of Microorganisms (LaBioMMi), Center for Exact Sciences and Technology, Federal University of São Carlos, Via Washington Luiz, km 235, 13.565-905, P.O. Box 676, São Carlos, SP, Brazil.
| | - Bianca Ferreira da Silva
- Institute of Chemistry, Department of Analytical Chemistry, São Paulo State University (UNESP), 14800-060, P.O. Box 355, Araraquara, SP, Brazil
| | - Edson Rodrigues Filho
- Laboratory of Micromolecular Biochemistry of Microorganisms (LaBioMMi), Center for Exact Sciences and Technology, Federal University of São Carlos, Via Washington Luiz, km 235, 13.565-905, P.O. Box 676, São Carlos, SP, Brazil.
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