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| Registros recuperados: 97 | |
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| Alfonso-Gordillo,Guadalupe; Cristiani-Urbina,Eliseo; Flores-Ortiz,César Mateo; Peralta,Humberto; Cancino-Díaz,Juan Carlos; Cruz-Maya,Juan Antonio; Jan-Roblero,Janet. |
| Background: Methyl tert-butyl ether (MTBE) is a pollutant that causes deleterious effects on human and environmental health. Certain microbial cultures have shown the ability to degrade MTBE, suggesting that a novel bacterial species capable of degrading MTBE could be recovered. The goal of this study was to isolate, identify and characterize the members of a bacterial consortium capable of degrading MTBE. Results: The IPN-120526 bacterial consortium was obtained through batch enrichment using MTBE as the sole carbon and energy source. The cultivable fraction of the consortium was identified; of the isolates, only Stenotrophomonas maltophilia IPN-TD and Sphingopyxis sp. IPN-TE were capable of degrading MTBE. To the best of our knowledge, this report is the... |
| Tipo: Journal article |
Palavras-chave: Bacterial consortium; Biodegradation; MTBE; Sphingopyxis sp; Stenotrophomonas maltophilia. |
| Ano: 2016 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582016000500003 |
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| La Rotta,Camilo E; D'Elia,Eliane; Bon,Elba P.S. |
| Chloroperoxidase (CPO) from Caldariomyces fumago catalyses the oxidation of several chlorinated phenols (CP) commonly found in industrial waste waters in the presence of hydrogen peroxide. This study compares the direct addition of hydrogen peroxide (DA) with its continuous electrogeneration (EG) during the enzymatic oxidation of CP. Reaction mixtures were studied containing chemically modified CPO, hydrogen peroxide and the phenolic substrates: phenol (P), 4-chlorophenol (4-CP), 2,4-dichlorophenol (2,4-DCP), 2,4,6-trichlorophenol (2,4,6-TCP) and pentachlorophenol (PCP), in 100 mM sodium-potassium phosphate buffer pH 6.0, at 25ºC. Results were compared in terms of residual phenol concentration (oxidation efficiency), precipitate formation (removal) and... |
| Tipo: Journal article |
Palavras-chave: Biodegradation; Bioelectrochemistry; Caldariomyces fumago; Chlorinated phenols; Chloroperoxidase; Hydrogen peroxide electrogeneration. |
| Ano: 2007 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582007000100003 |
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| Hernández García,Marcela; Morgante,Verónica; Ávila Perez,Marcela; Villalobos Biaggini,Patricio; Miralles Noé,Pola; González Vergara,Myriam; Seeger Pfeiffer,Michael. |
| s-Triazine-degrading bacterial strains were isolated from long-term simazine-treated agricultural soils of central Chile. The number of culturable heterotrophic bacteria of these agricultural soils (7 x 10(6) CFU/g of dry soil) was not affected by simazine application on field. The simazine-degrading bacterial strains P51, P52 and C53 were isolated by enrichment in minimal medium using simazine as the sole nitrogen source. Resting cells of strains P51 and P52 degraded >80% of simazine within 48 hrs, whereas strain C53 was able to remove >60% of the herbicide. The atzA and atzD genes of the s-triazine upper and lower catabolic pathways were detected in strains P51 and C53, while only atzD gene was observed in strain P52. To compare the bacterial 16S... |
| Tipo: Journal article |
Palavras-chave: Arthrobacter; Biodegradation; Bioremediation; Simazine; Stenotrophomonas; S-triazine. |
| Ano: 2008 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582008000500005 |
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| Tozoni,Daniela; Zacaria,Jucimar; Vanderlinde,Regina; Delamare,Ana Paula Longaray; Echeverrigaray,Sergio. |
| The purpose of this work was to stud the biodegradation of citronellol, citronellal and citronellyl acetate by a soil Pseudomonas mendocina strain (IBPse 105) isolated from a Cymbopogon windelandi field. This strain efficiently used citronellol, citronellal, citronellyl acetate and myrcene as sole source of carbon, but was not able to grow on other 15 monoterpenoids evaluated. Gas chromatography-mass spectrometry (GC-MS) analysis of metabolites accumulation during P. medocina IBPse 105 growth on citronellol showed that this strain uses the citronellol catabolic pathway described for other species of the genus. IBPse 105 degradation of citronellyl acetate initiates by its hydrolysis to citronellol. The mini-Tn5 insertion in mutant IBPse 105-303, impaired in... |
| Tipo: Journal article |
Palavras-chave: Biodegradation; Citronellol catabolism; Monoterpenes degradation; P. mendocina. |
| Ano: 2010 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582010000200002 |
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| Romero,M. Cristina; Reinoso,Enso H.; Urrutia,M. Inés; Moreno Kiernan,Alejandro. |
| At present, it is common to observe environments with organic and inorganic pollution, defined as co-contamination. Most industrial and urban effluents releases both pollutant types, leading to a complex environmental problem, as the biota must be tolerant to both xenobiotics. T. helicus, an efficient strain to degrade biphenyl, was trained with high copper levels, and became co tolerant to cobalt, lead and cadmium when was cultured in their presence. The copper adaptation was the result of physiological mechanisms, and the activated biochemical processes conferred resistance to Cu2+ as well as to other heavy metals. Furthermore, the Cu2+ adaptation of the mycelium was also transferred to the spores, that removed twice as much copper from solution than... |
| Tipo: Journal article |
Palavras-chave: Biodegradation; Biphenyl; Cocontaminated sites; Cotolerance; Metal sorption; Talaromyces helicus. |
| Ano: 2006 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582006000300009 |
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| SALLES, H. O.; EGITO, A. S. do; CARNEIRO, J. da C.; XIMENES, L. V.; RIBEIRO, M. T.; RIBEIRO, R. P.; BARBOSA, I. C.; SOUSA, A. M. P.. |
| A criação do banco de extratos composto por enzimas fibrolíticas isoladas de conteúdo ruminal de bovinos, caprinos e ovinos, foi iniciativa da Embrapa Caprinos e Ovinos e da Embrapa Gado de Leite, através de projetos de pesquisa em parceria, e tem como objetivo salvaguardar extratos enzimáticos de nossa biodiversidade para utilização biotecnológica, visando caracterizar, avaliar e identificar possíveis aplicabilidades científicas e/ou industriais das enzimas contidas nesses extratos. |
| Tipo: Comunicado Técnico (INFOTECA-E) |
Palavras-chave: Bioetanol; Enzimas fibrolíticas; Sugar byproducts.; Cellulolysis; Etanol; Cana de açúcar; Bagaço; Celulase; Enzima celulolítica; Cellulose; Biodegradation; Sugarcane; Ethanol.. |
| Ano: 2017 |
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/1087003 |
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| MELO, I. S. de; SILVA, C. M. M. de S.; FAY, E. F.; MONTEIRO, R. R.; ROSAMIGLIA, A. C.. |
| Atrazina é um dos herbicidas mais utilizados no mundo, apresentando relativa persistência em zonas saturadas e insaturadas. A principal via de dissipação de atrazina inclui a biodegradação. Solos coletados no município de Guaíra, SP, provenientes de áreas de mata, e solos sob cultivo intensivo, sob irrigação, com histórico de aplicação de atrazina, foram suplementados e incubados com o herbicida nas seguintes concentrações:70 microgramas g-1, 350 microgramas g-1 700 microgramas g-1. Após diluição em série, procedeu-se ao plaqueamento em meio de cultura (meio de Martin), também suplementado com o herbicida (700~g g ' l). Os fungos selecionados nesta fase foram cultivados em meio líquido de batata- dextrose (50%) suplementado com 700 microgramas mL-1 de... |
| Tipo: Boletim de Pesquisa e Desenvolvimento (INFOTECA-E) |
Palavras-chave: Herbicida; Microrganismo; Atrazina; Biodegradação; Penicillium; Atrazine; Herbicides; Biodegradation. |
| Ano: 1999 |
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/1026398 |
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| Blanchet, Marine; Pringault, Olivier; Panagiotopoulos, Christos; Lefevre, Dominique; Charriere, Bruno; Ghiglione, Jean-francois; Fernandez, Camila; Aparicio, Fran L.; Marrase, Celia; Catala, Philippe; Oriol, Louise; Caparros, Jocelyne; Joux, Fabien. |
| Heterotrophic bacterial communities in marine environments are exposed to a heterogeneous mixture of dissolved organic compounds with different bioreactivity that may control both their activity and composition. The coastal environment is an example of a mixing area where recalcitrant allochthonous organic matter from rivers can encounter labile organic matter from marine phytoplanktonic blooms. The objective of this study was to explore the effects of mixed qualities of dissolved organic matter (DOM) on bacterial community activity (BCA) and bacterial community composition (BCC) and to test for a priming effect when DOM sources are added in combination. Coastal marine bacterial communities were incubated separately with a mixture of amino acids and with... |
| Tipo: Text |
Palavras-chave: Dissolved organic matter; Biodegradation; Coastal waters; Bacterial community composition; Priming effect. |
| Ano: 2017 |
URL: https://archimer.ifremer.fr/doc/00625/73737/74701.pdf |
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| Ben Garali, Sondes Melliti; Sahraoui, Ines; Ben Othman, Hiba; Kouki, Abdessalem; De La Iglesia, Pablo; Diogene, Jorge; Lafabrie, Celine; Andree, Karl B.; Fernandez-tejedor, Margarita; Mejri, Kaouther; Meddeb, Marouan; Pringault, Olivier; Hlaili, Asma Sakka. |
| This study investigates the effects of polycyclic aromatic hydrocarbons (PAHs) on two potentially toxic Pseudonitzschia hasleana and P. mannii, isolated from a PAH contaminated marine environment. Both species, maintained in non-axenic cultures, have been exposed during 144 h to increasing concentrations of a 15 PAHs mixture. Analysis of the domoic acid, showed very low concentrations. Dose?response curves for growth and photosynthesis inhibition were determined. Both species have maintained their growth until the end of incubation even at the highest concentration tested (120 ?g l-1), Nevertheless, P mannii showed faster growth and seemed to be more tolerant than P. hasleana. To reduce PAH toxicity, both species have enhanced their biovolume, with a... |
| Tipo: Text |
Palavras-chave: Diatoms; Pseudo-nitzschia; PAHs mixtures; Biodegradation; Eco-toxicology. |
| Ano: 2021 |
URL: https://archimer.ifremer.fr/doc/00690/80215/83300.pdf |
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| Deroine, Morgan; Cesar, Guy; Le Duigou, Antoine; Davies, Peter; Bruzaud, Stephane. |
| In this study, natural degradation and biodegradation of poly(3-hydroxybuyrate-co-3-hydroxyvalerate) (PHBV) films were followed in different marine environments. First of all, ageing of PHBV films was investigated in natural seawater for 180 days and degradation was followed by means of weight loss measurements, scanning electron microscopy (SEM), differential scanning calorimetry and steric exclusion chromatography. In a second part, biodegradation tests were performed on PHBV powder, by following carbon dioxide (CO2) release(,) to highlight the PHBV bioassimilation of marine microorganisms. Three different marine environments were considered for biodegradation tests: a solid inoculum with foreshore sand, a solid-liquid inoculum with sand and seawater and... |
| Tipo: Text |
Palavras-chave: PHBV; Natural ageing; Degradation; Biodegradation; Seawater. |
| Ano: 2015 |
URL: http://archimer.ifremer.fr/doc/00296/40735/42020.pdf |
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| Cossa, Daniel; Maggi, Pierre. |
| In this research, biodegradation associated with evaluation of the variations of acute toxicity of 5 anionic detergents towards Anguilla anguilla is described. It appears that the process of anionic detergent biodegradation in sea water is similar to the results obtained by many authors working on fresh water. The experimentation shows 2 different kinds of behavior among the 5 anionic detergents tested: (a) the first category is composed of syndets, without aryl group in their formulation, which are promptly oxidized by bacteria and do not reveal variation of acute toxicity during their biodegradation; (b) the other group includes LAS; those syndets need a quite long bacterial acclimation. On the other hand, their toxicity is reduced whilst they are... |
| Tipo: Text |
Palavras-chave: Anguilla anguilla; Toxicity; Biodegradation; Anionic detergent. |
| Ano: 1973 |
URL: http://archimer.ifremer.fr/doc/1973/publication-2155.pdf |
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| Okpokwasili, G; Somerville, C; Grimes, D; Colwell, R. |
| A differential, phenanthrene-enrichment agar plating technique was used to isolate phenanthrene-degrading bacteria from phenanthrene-enriched Chesapeake Bay sediment. One of the isolates, a yellow pigmented, slime-producing, Gram-negative rod identified as Flavobacterium sp. has been studied in detail. It has been found to carry a single plasmid with a mass of about 34 megadaltons. Results of hydrocarbon adherence tests showed that the organism adhered only minimally to n-octane and n-hexadecane, but emulsified cyclohexylbenzene and 1,2,3,4,-tetrahydronaphthalene (tetralin). Curing of the plasmid with 3 mu g/ml novobiocin resulted in loss of phenanthrene clearing ability. Ability to degrade phenanthrene was confirmed using super(14)C-labeled phenanthrene. |
| Tipo: Text |
Palavras-chave: Flavobacterium; Microbiological culture; Culture media; Bacteria; Sediment pollution; Biodegradation; Bacteria collecting devices. |
| Ano: 1984 |
URL: http://archimer.ifremer.fr/doc/1984/acte-1014.pdf |
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| Registros recuperados: 97 | |
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