Hydroxyatrazine
Mostrando 1-12 de 16 artigos, teses e dissertações.
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1. Atrazine degradation patterns: the role of straw cover and herbicide application history
ABSTRACT: In Brazil, atrazine (ATZ) is widely applied to maize (Zea mays L.) fields for weed control. The presence of ATZ and its metabolites in soil and water matrices has become a matter of some concern for governmental authorities as well as for society at large. This study evaluated the patterns of ATZ degradation (mineralization, extractable and non-ext
Sci. agric. (Piracicaba, Braz.). Publicado em: 2019-02
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2. Evaluation of Monolithic and Core-Shell Columns for Separation of Triazine Herbicides by Reversed Phase High Performance Liquid Chromatography
Monolithic and core-shell columns were comparatively evaluated for separation of deisopropylatrazine (DIA), deethylatrazine (DEA), hydroxyatrazine (HAT), simazine (SIM) and atrazine (ATR) under similar conditions of elution, flow rate and sample volume. Although both columns provided separation of the analytes with resolution > 1.5, the core-shell column exh
J. Braz. Chem. Soc.. Publicado em: 2015-11
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3. Comportamento da atrazina em solos brasileiros em condicoes de laboratorio.
A persistencia, a mobilidade e as constantes de adsorcao da atrazina foram estudadas em condicoes de laboratorio, em dois tipos de solos (Gley Humico e Latossolo Vermlho-Escuro) durante 180 dias apos a aplicacao da C-atrazina as amostras de solos, incubadas a temperatura de 25C, no escuro. A meia-vida da atrazina foi de 56 dias no solo Gley Humico e 54 dias
Pesquisa Agropecuaria Brasileira. Publicado em: 2011
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4. Sorption of atrazine, propazine, deethylatrazine, deisopropylatrazine and hydroxyatrazine onto organovermiculite
Estudou-se a interação de atrazina (AT), propazina (PROP), desetil-atrazina (DEA), deisopropil-atrazina (DIA) e hidroxi-atrazina (HAT) com o argilomineral vermiculita saturado com K+ (VTK) e com VTK modificada pela incorporação de hexadeciltrimetil-amônio (HDTMA-VT) no espaço interlamelar. A VTK bruta teve interação desprezível com AT, PROP e DEA, i
Journal of the Brazilian Chemical Society. Publicado em: 2005-10
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5. Mechanistic study od atrazine herbicide oxidation in the presence of minerals znd humic substances in anaerobic environmen. / Estudo do mecanismo de oxidação do herbicida atrazina na presença de minerais e sustâncias húmicas em ambiente anaeróbio.
The oxidative decomposition of atrazine was induced by hydroxyl radicals generated from the interaction between hydrogen peroxide, H2O2, and iron oxides, yielding the Fenton reaction. The reaction rate of atrazine oxidation was followed in the presence of iron minerals: goethite, ferrihydrite, and lepidocrocite; and further with humic acid (HA) extracted fro
Publicado em: 2005
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6. Glutathione Conjugation: An Enzymatic Basis for Atrazine Resistance in Corn
The primary factor for atrazine selectivity in corn (Zea mays) is the activity of a soluble enzyme, glutathione S-transferase, which detoxifies atrazine by catalyzing the formation of an atrazine-glutathione conjugate (GS-atrazine). The nonenzymatic, benzoxazinone-catalyzed hydrolysis of atrazine to hydroxyatrazine contributed to the total resistance of corn
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7. Atrazine chlorohydrolase from Pseudomonas sp. strain ADP: gene sequence, enzyme purification, and protein characterization.
Pseudomonas sp. strain ADP metabolizes atrazine to carbon dioxide and ammonia via the intermediate hydroxyatrazine. The genetic potential to produce hydroxyatrazine was previously attributed to a 1.9-kb AvaI DNA fragment from strain ADP (M. L. de Souza, L. P. Wackett, K. L. Boundy-Mills, R. T. Mandelbaum, and M. J. Sadowsky, Appl. Environ. Microbiol. 61:3373
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8. Cloning, characterization, and expression of a gene region from Pseudomonas sp. strain ADP involved in the dechlorination of atrazine.
We previously identified a Pseudomonas sp. strain, ADP, which rapidly metabolized atrazine in liquid culture, agar plates, and soils (R. T. Mandelbaum, D. L. Allan, L. P. Wackett, Appl. Environ. Microbiol. 61:1451-1457, 1995). In this study, we report the cloning and partial characterization of a gene region from Pseudomonas sp. strain ADP that encodes atraz
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9. Molecular Basis of a Bacterial Consortium: Interspecies Catabolism of Atrazine
Pseudomonas sp. strain ADP contains the genes, atzA, -B, and -C, that encode three enzymes which metabolize atrazine to cyanuric acid. Atrazine-catabolizing pure cultures isolated from around the world contain genes homologous to atzA, -B, and -C. The present study was conducted to determine whether the same genes are present in an atrazine-catabolizing bact
American Society for Microbiology.
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10. Biodegradation of Atrazine by Agrobacterium radiobacter J14a and Use of This Strain in Bioremediation of Contaminated Soil
We examined the ability of a soil bacterium, Agrobacterium radiobacter J14a, to degrade the herbicide atrazine under a variety of cultural conditions, and we used this bacterium to increase the biodegradation of atrazine in soils from agricultural chemical distribution sites. J14a cells grown in nitrogen-free medium with citrate and sucrose as carbon sources
American Society for Microbiology.
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11. The atzB gene of Pseudomonas sp. strain ADP encodes the second enzyme of a novel atrazine degradation pathway.
We previously reported the isolation of a 21.5-kb genomic DNA fragment from Pseudomonas sp. strain ADP, which contains the atzA gene, encoding the first metabolic step for the degradation of the herbicide atrazine (M. de Souza, L. P. Wackett, K. L. Boundy-Mills, R. T. Mandelbaum, and M. J. Sadowsky, Appl. Environ. Microbiol. 61:3373-3378, 1995). In this stud
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12. Enzymatic Degradation of Chlorodiamino-s-Triazine
2-Chloro-4,6-diamino-s-triazine (CAAT) is a metabolite of atrazine biodegradation in soils. Atrazine chlorohydrolase (AtzA) catalyzes the dechlorination of atrazine but is unreactive with CAAT. In this study, melamine deaminase (TriA), which is 98% identical to AtzA, catalyzed deamination of CAAT to produce 2-chloro-4-amino-6-hydroxy-s-triazine (CAOT). CAOT
American Society for Microbiology.