Consulta: subjectFacets:"Methane oxidation"
Registros recuperados: 5
Data/hora: 08/06/2024 15:34:58

Fluxo de gases-traco de efeito estufa na interface solo/atmosfera em solos de cerrado (2001).
Provedor de dados: 14
Autores: CARDOSO, A. N.; SAMINEZ, T. C.; VARGAS, M. A.
A contribuicao da agricultura para as emissoes de gases de efeito estufa tem sido discutida em varios estudos. No que se refere as emissoes de CH4 (metano) e N2O (oxido nitroso), tem sido demostrado que a contribuicao dela esta em torno de 65% e 90% do total das emissoes antropogenicas respectivamente. O metano e produzido pela decomposicao anaerobica da materia organica no solo, queima de residuos e fermentacao de ruminantes. O cosumo desse gas ocorre pela oxidacao de radicais OH na troposfera e por oxidacao microbiologica no solo. O oxido nitroso e igualmente distribuido na troposfera e apresenta um tempo de resistencia bem maior do que o metano. Esse gas e produzido nos solos por processos biologicos e não-bioloicos, a partir de tranformacoes...
Tipo: Boletim de Pesquisa e Desenvolvimento (INFOTECA-E)
Palavras-chave: GEOSEN400; Oxido nitroso; Gas estufa; Methane oxidation; Geoprocessamento e Sensoriamento remoto: Mudanca climatica.; Atmosfera; Cerrado; Metano; Mudança Climática; Oxidação; Solo.; Methane; Nitrous oxide.
Ano: 2001
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/567090

Microbial methane oxidation and sulfate reduction at cold seeps of the deep Eastern Mediterranean Sea
Provedor de dados: 5
Autores: Omoregie, Enoma O.; Niemann, Helge; Mastalerz, Vincent; De Lange, Gert J.; Stadnitskaia, Alina; Mascle, Jean; Foucher, Jean-paul; Boetius, Antje.
The Eastern Mediterranean hosts a variety of active cold seep systems, such as gas chimneys, mud volcanoes and pockmarks, in water depths of 500 to 3200 m. As part of the NAUTINIL expedition in 2003, the sediments of cold seeps on the Nile Deep Sea Fan (NDSF) were sampled for the first time for biogeochemical and microbiological analyses. Here we compare rates of the anaerobic oxidation of methane (AOM) and sulfate reduction (SR) as well as the microbial community structure of a variety of cold seep systems including mud volcanoes, pockmarks and brine seeps. Our results revealed strong differences in microbial activity among the different seep systems of the Eastern, Central and Western provinces of the NDSF, as well as the Olimpi field (Central...
Tipo: Text
Palavras-chave: Methane oxidation; Sulfate reduction; Archaea; Cold seeps; Mud volcano; Pockmarks; Nile Deep Sea Fan.
Ano: 2009
URL: http://archimer.ifremer.fr/doc/00000/11087/7910.pdf

Comparison of the methane oxidation rate in four media
Provedor de dados: 90
Autores: Rose,Juliana Lundgren; Mahler,Cláudio Fernando; Izzo,Ronaldo Luis dos Santos.
Landfill gas emissions are one of the main sources of anthropogenic methane (CH4), a major greenhouse gas. In this paper, an economically attractive alternative to minimize greenhouse gas emissions from municipal solid waste landfills was sought. This alternative consists in special biofilters as landfill covers with oxidative capacity in the presence of CH4. To improve the quality/cost ratio of the project, compost was chosen as one of the cover substrates and soil (Typic red yellow-silt-clay Podzolic) as the other. The performance of four substrates was studied in laboratory experiments: municipal solid waste (MSW) compost, soil, and two soil-compost at different proportions. This study aimed to evaluate the suitability and environmental compatibility as...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Methane oxidation; Biofilter; Municipal solid waste compost; Solid waste landfill cover; Case study.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832012000300011

Denitrification coupled with methane anoxic oxidation and microbial community involved identification
Provedor de dados: 52
Autores: Cuba,Renata Medici Frayne; Duarte,Iolanda Cristina; Saavedra,Nora Katia; Varesche,Maria Bernadete Amâncio; Foresti,Eugenio.
In this work, the biological denitrification associated with anoxic oxidation of methane and the microbial diversity involved were studied. Kinetic tests for nitrate (NO3-) and nitrite (NO2-) removal and methane uptake were carried out in 100 mL batch reactors incubated in a shaker (40 rpm) at 30 ºC. Denitrificant/methanotrophic biomass was taken from a laboratory scale reactor fed with synthetic nitrified substrates (40 mgN L-1 of NO3- and subsequently NO2-) and methane as carbon source. Results obtained from nitrate removal followed a first order reaction, presenting a kinetic apparent constant (kNO3)) of 0.0577±0.0057d-1. Two notable points of the denitrification rate (0.12gNO3--N g-1 AVS d-1 and 0.07gNO3--N g-1 AVS d-1) were observed in the beginning...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Denitrification; Methylomonas sp; Methane oxidation.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132011000100022

Effects of trace volatile organic compounds on methane oxidation
Provedor de dados: 52
Autores: Chiemchaisri,Wilai; Visvanathan,Chettiyappan; Jy,Shing Wu.
The effects of volatile organic compounds (VOCs) on methane oxidation in landfill cover soils were examined. The batch experiments were conducted using single and mixed VOCs, such as, dichloromethane (DCM), trichloroethylene (TCE), tetrachloroethylene (PCE), and benzene. The results from all combinations showed a decrease in methane oxidation rate with increase in VOC concentrations. Moreover, inhibition effects of TCE and DCM were found higher than benzene and PCE. The reduction of methane oxidation by benzene and PCE could be attributed to the toxicity effect, whereas TCE and DCM were found to exhibit the competitive-inhibition effect. When the soil was mixed with DCM, no methane oxidation was found. Damage to the cell’s internal membrane was found in a...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Landfill cover soils; Methane; Methanotrophs; Methane oxidation; Volatile organic compounds (VOCs).
Ano: 2001
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132001000200005