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| Registros recuperados: 97 | |
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| Leal, Patrícia Lopes; Pinheiro Dadalto, Silvana; Fernandes, Rita de Cássia Rocha; Queiroz, Maria Eliana Lopes Ribeiro; Tótola, Marcos Rogério. |
| The effect of successive soil contamination with diesel oil was evaluated on population dynamics of a bacterial consortium (Acinetobacter baumannii LBBMA 04, Pseudomonas aeruginosa LBBMA 58, Ochrobactrum anthropi LBBMA 88b, Acinetobacter baumannii LBBMAES11, and Bacillus subtilis LBBMA 155) and on biodegradation of petroleum hydrocarbons (n-C12-C22). After each contamination with diesel oil, soil samples were collected for assessment of bacterial population and sequence of petroleum hydrocarbons degradation. At 20 and 40 days, the highest percentage of degradation was observed for the higher carbon chain hydrocarbons (n-C21 and C22). After the third contamination, there was a considerable reduction of n-C21degradation and a high degradation of hydrocarbons... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Ciências Agrárias; Microbiologia; Biorremediação bioaugmentation; Biodegradation; Pollution control; Hydrocarbons. Ciências Agrárias I. |
| Ano: 2018 |
URL: http://periodicos.uem.br/ojs/index.php/ActaSciBiolSci/article/view/36904 |
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| Silva, Ísis Serrano; UNICAMP; Menezes, Cristiano Ragagnin de; UNICAMP; Faria, Andréia Fonseca de; UNICAMP; Costa, Josemar Gurgel da; UFRN; Pepper, Susan; The University of Melbourne; Britz, Margaret; The University of Melbourne; Durrant, Lucia Regina; UNICAMP. |
| Polycyclic aromatic hydrocarbons (PAHs) constitute a group of priority pollutants which are present at high concentrations in the soils of many industrial contaminated sites. Pollution by these compounds may stimulate growth of organisms able to live in these environments causing changes in the structure of the microbial community due to some cooperative process of metabolization of toxic compounds. A long-term PAH-contaminated soil was stored for several years and used to analyze the native microbiota regarding their ability to grow on pyrene, benzo[a]pyrene, as well as in mixtures of LMW- and HMW-PAHs. Molecular profiles of the microbial community was assessed by PCR-DGGE of 16S rRNA gene, and the number of bands observed in DGGE analyses was interpreted... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Polycyclic aromatic hydrocarbons (PAHs); Biodegradation; PCR-DGGE; Microbial community Polycyclic aromatic hydrocarbons (PAHs); Biodegradation; PCR-DGGE; Microbial community. |
| Ano: 2009 |
URL: http://periodicos.uem.br/ojs/index.php/ActaSciBiolSci/article/view/7575 |
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| ZHU,JIANGWEI; ZHAO,YAN; RUAN,HONGHUA. |
| Abstract: The strains CM-Z19 and CM-Z6, which are capable of highly degrading chlorpyrifos-methyl, were isolated from soil. They were identified as Bacillus megaterium CM-Z19 and Pseudomonas syringae CM-Z6, respectively, based on the 16S rRNA and an analysis of their morphological, physiological and biochemical characteristics. The strain CM-Z19 showed 92.6% degradation of chlorpyrifos-methyl (100 mg/L) within 5 days of incubation, and the strain CM-Z6 was 99.1% under the same conditions. In addition, the degradation characteristics of the two strains were compared and studied, and the results showed that the strain CM-Z19 had higher phosphoesterase activity and ability to degrade the organophosphorus pesticide than did the strain CM-Z6. However, the... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Bacillus megaterium; Pseudomonas syringae; Chlorpyrifos-methyl; 3; 5; 6-trichloro-2-pyridinol; Biodegradation. |
| Ano: 2019 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652019000500624 |
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| Reis,Emily Correna Carlo; Borges,Andréa Pacheco Batista; Fonseca,Cláudio César; Martinez,Mastoby Miguel Martinez; Eleotério,Renato Barros; Morato,Gláucia Oliveira; Oliveira,Paulo Miranda. |
| In this work, biocompatibility, osteointegration, osteoconductivity, and biodegradation of a hydroxyapatite polyhydroxybutyrate new composite were evaluated. The composite was implanted in rabbits' bone defects and clinical, radiographic, histological, and histomorphometric data of these animals were compared with those of unfilled defects on the days 8th, 45th, and 90th after surgery. No significant differences existed between the groups for the evaluated clinical parameters. Radiographs showed bone-composite direct contact. Bone formed within the defect, interface and inside the composite. Significant differences were found between the bone and connective tissues percentage within the defect at all dates and at the interface on the 45th day, bone tissue... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Biomaterials; Bone; Biocompatibility; Biodegradation; Hydroxyapatite-polyhydroxybutyrate composite. |
| Ano: 2010 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132010000400010 |
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| Gerrard,Andrew Mark; Páca Júnior,Jan; Kostecková,Alena; Páca,Jan; Stiborová,Marie; Soccol,Carlos Ricardo. |
| This paper proposes the use of a preliminary, phenol removal step to reduce peak loads arriving at a conventional effluent plant. A packed bed reactor (PBR) using polyurethane foam, porous glass and also cocoa fibres as the inert support material was used. Experiments have been carried out where the flow-rates, plus inlet and outlet phenol concentrations were measured. A simple, plug-flow model is proposed to represent the results. Zero, first order, Monod and inhibited kinetics rate equations were evaluated. It was found that the Monod model gave the best fit to the experimental data and allowed linear graphs to be plotted. The Monod saturation constant, K, is approximately 50 g m-3, and ka is around 900 s-1. |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Biodegradation; Phenol; Aerobic reactor; Models. |
| Ano: 2006 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132006000500018 |
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| Martins,Paula Fabiane; Martinez,Camila Ortiz; Carvalho,Giselle de; Carneiro,Paulo Irajara Borba; Azevedo,Ricardo Antunes; Pileggi,Sônia Alvim Veiga; Melo,Itamar Soares de; Pileggi,Marcos. |
| The aim of this work was to study herbicide degradation through selected microorganisms from humus and soil subjected to different plantation systems. The following bacterial species were identified: Klebsiella pneumoniae pneumoniae GC s.B strain 1, Pseudomonas alcaligenes, Enterobacter aerogenes GC s.A and Klebsiella pneumoniae pneumoniae GC s.B strain 2. Growth studies yet suggested the possibility of a very long lag phase. Although, culture with the herbicide presented biofilm formation and there were color changes in the herbicide that could have interfered with the espectrophotometry readings. After 5 days of incubation at 35ºC, the difference in the concentration of herbicide was 14.42% on average and after 10 days, 35.01%. |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Bioremediation; Biodegradation; S-Metolachlor; Herbicide. |
| Ano: 2007 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132007000100019 |
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| Sene,Luciane; Converti,Attilio; Secchi,Geslaine Aparecida Ribeiro; Simão,Rita de Cássia Garcia. |
| The world practice of using agrochemicals for long periods, in an indiscriminated and abusive way, has been a concern of the authorities involved in public health and sustainability of the natural resources, as a consequence of environmental contamination. Agrochemicals refer to a broad range of insecticides, fungicides and herbicides, and among them stands out atrazine, a herbicide intensively used in sugarcane, corn and sorghum cultures, among others. Researches have demonstrated that atrazine has toxic effects in algae, aquatic plants, aquatic insects, fishes and mammals. Due to the toxicity and persistence of atrazine in the environment, the search of microbial strains capable of degrading it is fundamental to the development of bioremediation... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Atrazine; Biodegradation; Bacteria; Fungi; Microbial consortium. |
| Ano: 2010 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132010000200030 |
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| Miranda,Rita de Cássia; Souza,Cynthia Silva de; Gomes,Edelvio de Barros; Lovaglio,Roberta Barros; Lopes,Carlos Edison; Sousa,Maria de Fátima Vieira de Queiroz. |
| The aim of this work was to investigate the potential of the diesel oil degrading yeasts to use them in bioremediation of areas contaminated by this pollutant. The cultures, identified as Rhodotorula aurantiaca UFPEDA 845 and Candida ernobii UFPEDA 862, were selected at the initial stage. In the course of the biodegradation assays, C. ernobii degraded tetradecane, 5 methyl-octane and octadecane completely and decane (60.8%) and nonane (21.4%) partially whilst R. aurantiaca presented degradation percentages of 93% for decane, 38.4% for nonane and 22.9% for dodecane. |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Biodegradation; Yeasts; Diesel oil. |
| Ano: 2007 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132007000100018 |
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| Wanderley,Carlos Ronald Pessoa; Andrade,Marcus Vinícius; Pereira,Luciana José; Silva,Gloria Maria Marinho; Pessoa,Kelly Rodrigues. |
| ABSTRACT The mineralization of the azo dye congo red by the fungi Phanerochaete chrysosporium was studied in two sequential batch bioreactors (R1 and R2), operated in cycles of 48 h (step I) and 24 h (step II). In step I, glucose concentration was 1 g.L-1 in both reactors and in step II, 1 g.L-1 of glucose was maintained in R1, but R2 received no addition of glucose. In step I, the average dye removal efficiencies were 76 ± 29 % (R1) and 53 ± 15% (R2), while in step II the averages recorded for dye removal for R1 and R2 were 84 ± 15 and 70 ± 28%, respectively. The rates of dye removal were 0.04 h-1 in R1 and 0.03 h-1 in R2 in step I. Higher rates were obtained in step II, 0,07 h-1 and 0,02 h-1 for R1 and R2, respectively. The highest dye removal occurred... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Biodegradation; Congo red; Phanerochaete chrysosporium; Sequential bioreactors. |
| Ano: 2018 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132018000100606 |
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| Crivelaro,Sérgio Henrique Rezende; Mariano,Adriano Pinto; Furlan,Luis Tadeu; Gonçalves,Renato Almeida; Seabra,Paulo Negrais; Angelis,Dejanira de Franceschi de. |
| This work aimed to study the effect of vinasse on the biodegradation in soil of oily sludge from the Replan-Petrobras oil refinery. The Bartha respirometric method was used to verify the efficiency of the treatments with soil, oily sludge (7 and 14% m/m) and soil moisture adjustment with or without vinasse (0.11 mL/g dry soil) for 121 days. Although an increase in the soil microbial population was obtained with the vinasse, it demonstrated not to be adequate to enhance the biodegradation efficiency of the oily sludge in soil, since there was no difference between the CO2 produced from treatments with or without vinasse after the complete consumption of the vinasse. Thus, the use of vinasse as an amendment to biodegradation processes showed not to be... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Biodegradation; Soil; Oily sludge; Vinasse; Landfarming. |
| Ano: 2010 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132010000500027 |
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| Reena,; Dhall,Purnima; Kumar,Rita; Kumar,Anil. |
| Present study reports the validation (oxidation) of computationally predicted oxidation of xenobiotic contaminants by commercially available pure laccase from Trametes versicolor. Selected contaminants were predicted as potential targets for laccase oxidation by using in-silico docking tool. The oxidation by laccase was measured by change in absorbance at specific λ max of each compound. Sinapic acid and tyrosine were taken as positive and negative controls, respectively. Oxidation was observed in m-chlorophenol, 2,4 di-chlorophenol, 2,4,6 tri-chlorophenol, captan, atrazine and thiodicarb, except malathion, which showed no activity. It could be speculated that the predicted substrates showing oxidation shared homology at structural and chemical level with... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Biodegradation; In silico screening; Laccase; Xenobiotics. |
| Ano: 2014 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132014000500803 |
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| Ferreira,Tatiana Felix; Coelho,Maria Alice Zarur; Rocha-Leão,Maria Helena Miguez da. |
| Yarrowia lipolytica is unique strictly aerobic yeast with the ability to efficiently degrade hydrophobic substrates such as n-alkenes, fatty acids, glycerol and oils. In the present work, a 2(4) full factorial design was used to investigate the influence of the independent variables of temperature, agitation, initial cell concentration and initial petroleum concentration on crude oil biodegradation. The results showed that all variables studied had significant effects on the biodegradation process. Temperature, agitation speed and initial cell concentration had positive effects, and initial petroleum concentration had a negative effect. Among the crude oil removal conditions studied, the best temperature and agitation conditions were 28ºC and 250 rpm,... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Yarrowia lipolytica; Crude oil; Biodegradation. |
| Ano: 2012 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132012000500019 |
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| Registros recuperados: 97 | |
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