Consulta: subjectFacets:"Methane"
Registros recuperados: 102
Data/hora: 18/06/2024 10:31:02

Evaluación in vitro de subproductos agrícolas y plantas con capacidad desfaunante sobre la producción de metano.
Provedor de dados: 32
Autores: Portela Díaz, Diego Felipe.
Actualmente se necesitan alternativas que disminuyan la emisión de metano asociada a la producción ganadera, una opción, es el uso de plantas que contienen metabolitos secundarios y causan la desfaunación ruminal. El presente estudio tuvo como objetivo principal, evaluar la capacidad desfaunante in vitro de diferentes plantas y subproductos agrícolas, así como su efecto en algunas variables de fermentación ruminal, población de microorganismos, producción de dióxido de carbono  y metano. En la primera fase, se evaluaron 10 plantas y 6 subproductos agrícolas. El follaje del chicalote blanco (Argemone ochroleuca) y el subproducto, cascabillo de café (Coffea arabica) fueron seleccionados, ya que presentaron la mayor capacidad desfaunante. A la 96 h de...
Palavras-chave: Metano; Desfaunación; Protozoarios; Coffea arabica; Argemone ochroleuca; Methane; Defaunation; Protozoa; Ganadería; Maestría.
Ano: 2012
URL: http://hdl.handle.net/10521/1711

Evaluación de una bacteria ruminal acetogénica en la producción de metano in vitro.
Provedor de dados: 32
Autores: Abrego García, Amaury.
Una alternativa para disminuir las emisiones de metano de los rumiantes es mediante la inoculación de bacterias acetogénicas, estas bacterias pueden competir por los sustratos (CO2 e H+) que usan las bacterias metanogénicas para producir metano. Los objetivos del estudio fueron identificar mediante secuenciación del gen ADNr 16S una bacteria ruminal acetogénica (BRA) aislada en medios selectivos, y evaluar el efecto de su inclusión sola o en cocultivo con un inóculo de bacterias ruminales totales (IBRT) en la producción de metano, ácidos grasos volátiles (AGV), y la degradación in vitro de la materia seca (DIVMS). La bacteria aislada se identificó como Clostridium paraputrificum. La BRA fue inoculada a dos concentraciones (1x106 y 1x108 bacterias mL-1 de...
Palavras-chave: Bacteria ruminal acetogénica; Producción de gas in vitro; Metano; Dióxido de carbono; Bacterias ruminales; Acetogenic-rumen bacteria; In vitro gas production; Methane; Carbon dioxide; Rumen bacteria; Ganadería; Maestría.
Ano: 2012
URL: http://hdl.handle.net/10521/719

Aislamiento y caracterización in vitro de una bacteria acetogénica ruminal
Provedor de dados: 32
Autores: Rodríguez Carrillo, Jaime Azael.
La producción de metano (CH4) en rumiantes representa una pérdida de energía  metabólica para el animal y contribuye en la generación de gases efecto invernadero. Una  alternativa para disminuir la producción de CH4 en los rumiantes, es desarrollando inoculos  de bacterias acetogénicas que compitan con las bacterias metanogénicas por los sustratos  utilizados en la producción de metano. En el presente estudio se usó un medio de cultivo  selectivo a base de formato y líquido ruminal (F-LR) para el asilamiento de una bacteria  ruminal acetogénica. Se determinaron algunas características morfológicas y metabólicas de  la bacteria aislada. También, se evaluó su capacidad para producir acetato a partir de  formato, y de disminuir la metanogénesis en cocultivo...
Tipo: Tesis
Palavras-chave: Metano; Bacteria ruminal acetogénica; Microorganismos ruminales; Gases efecto invernadero; Maestría; Ganadería; Methane; Acetogenica-rumen bacteria; Ruminal microorganims; Greenhouse gas effect.
Ano: 2009
URL: http://hdl.handle.net/10521/1504

Effect of temperature on the anaerobic digestion of palm oil mill effluent
Provedor de dados: 69
Autores: Choorit,Wanna; Wisarnwan,Pornpan.
Two continuous stirred tank reactors (CSTRs) each fed with palm oil mill effluent (POME), operated at 37ºC and 55ºC, respectively, were investigated for their performance under varies organic loading rates (OLRs). The 37ºC reactor operated successfully at a maximum OLR of 12.25 g[COD]/L/day and a hydraulic retention time (HRT) of 7 days. The 55ºC reactor operated successfully at the higher loading rate of 17.01 g[COD]/L/day and had a HRT of 5 days. The 37ºC reactor achieved a 71.10% reduction of chemical oxygen demand (COD), a biogas production rate of 3.73 L of gas/L[reactor]/day containing 71.04% methane, whereas the 55ºC reactor achieved a 70.32% reduction of COD, a biogas production rate of 4.66 L of gas/L[reactor]/day containing 69.53% methane. An OLR...
Tipo: Journal article
Palavras-chave: Hydraulic retention times; Mesophilic reactor; Methane; Organic loading rate; Temperature variations; Thermophilic reactor; Volatile fatty acids.
Ano: 2007
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582007000300005

COD, TSS, nutrients and coliforms removals in UASB reactors in two stages treating swine wastewater
Provedor de dados: 70
Autores: Ramires,Roseane Del'Arco; Oliveira,Roberto Alves de.
The performance of two upflow anaerobic sludge blanket (UASB) reactors was evaluated in pilot scale (908 and 188 L), installed in series (R1 and R2), fed with swine wastewater with TSS around 5 and 13 g L-1. The UASB reactors were submitted to HDT of 36 and 18 h with VOL of 5.5 to 34.4 g COD (L d)-1 in the R1 and HDT of 7.5 e 3.7 h with VOL from 5.1 to 45.2 g COD (L d)-1 in the R2. The average removal efficiencies of COD ranged from 55 to 85% in the R1 and from 43 to 57% in the R2, resulting in values from 82 to 93% in the UASB reactors in two stage. Methane concentrations in the biogas were 69 to 74% with specific production from 0.05 to 0.27 L CH4 (g removedCOD)-1 in the R1 and of 0.10 to 0.12 L CH4 (g removedCOD)-1 in the R2. The average removal...
Tipo: Info:eu-repo/semantics/other
Palavras-chave: Volumetric organic load; Methane; N and P removal; Metal removal; Suspended solids.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162014000600020

Anaerobic-aerobic treatment of swine wastewater in uasb and batch reactors in series
Provedor de dados: 70
Autores: Urbinati,Estevão; Oliveira,Roberto Alves de.
In this work it was evaluated the performance of two systems of swine wastewater treatment consisting of two-stage upflow anaerobic sludge blanket (UASB) reactors, with and without post-treatment in sequencing batch reactor (SBR), fed continuously, with aerobic phase. The UASB reactors in the first stage had 908 L in the sets I and II, and in the second stage 350 and 188 L, respectively. In the set II the post-treatment was performed in a SBR of 3,000 L. The hydraulic detention times in the anaerobic treatment systems were 100, 75 and 58 h in the set I; 87, 65 and 51 h in the set II; and 240 and 180 h in the SBR. The volumetric organic load applied in the first stage UASB reactors ranged from 6.9 to 12.6 g total COD (L d)-1 in the set I and 7.5 to 9.8 g...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Coliforms; Methane; Two-stage anaerobic reactors; Nutrients removal; Combined treatment.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162014000100014

Performance of UASB reactors in two stages followed by post-treatment with activated sludge in wastewater batch of wet-processed coffee
Provedor de dados: 70
Autores: Bruno,Marcelo; Oliveira,Roberto A. de.
In this study it was evaluated the efficiency of the treatment of wet-processed coffee wastewater in upflow anaerobic sludge blanket (UASB) reactors in two stages, in bench scale, followed by post-treatment with activated sludge in batch. The first UASB reactor was submitted to an hydraulic retention time (HRT) of 6.2 d and organic loading rates (OLR) of 2.3 and 4.5g CODtotal (L d)-1, and the second UASB reactor to HRT of 3.1 d with OLR of 0.4 and 1.4g CODtotal (L d)-1. The average values of the affluent CODtotal increased from 13,891 to 27,926mg L-1 and the average efficiencies of removal of the CODtotal decreased from 95 to 91%, respectively, in the UASB reactors in two stages. The volumetric methane production increased from 0.274 to 0.323L CH4 (L...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Anaerobic digestion; Methane; Nitrogen; Phosphorus; Phenols.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162013000400020

Start-up of horizontal anaerobic reactors with sludge blanket and fixed bed for wastewater treatment from coffee processing by wet method
Provedor de dados: 70
Autores: Oliveira,Roberto A. de; Bruno,Natani M. N.
In this study it was evaluated the start-up procedures of anaerobic treatment system with three horizontal anaerobic reactors (R1, R2 and R3), installed in series, with volume of 1.2 L each. R1 had sludge blanket, and R2 and R3 had half supporter of bamboo and coconut fiber, respectively. As an affluent, it was synthesized wastewater from mechanical pulping of the coffee fruit by wet method, with a mean value of total chemical oxygen demand (CODtotal) of 16,003 mg L-1. The hydraulic retention time (HRT) in each reactor was 30 h. The volumetric organic loading (VOL) applied in R1 varied from 8.9 to 25.0 g of CODtotal (L d)-1. The mean removal efficiencies of CODtotal varied from 43 to 97% in the treatment system (R1+R2+R3), stabilizing above 80% after 30...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Volumetric organic loading; Bamboo; Methane; Phenols; Reactors in series.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162013000200014

Estimativa da emissão de gases de efeito estufa e da volatilização de amônia em sistemas de manejo de solo e de sucessão/rotação de culturas com trigo.
Provedor de dados: 14
Autores: SANTI, A.; SANTOS, H. P. dos; BAYER, C.; DALMAGO, G. A.; DE BONA, F. D.; SILVA, E. L. da; SCHERER, L. A.; ZEIST, C.
bitstream/item/162965/1/ID44098-2017CTO32.pdf
Tipo: Circular Técnica (INFOTECA-E)
Palavras-chave: Plantio convencional; Plantio direto; Metano; Nitrogênio; No-tillage; Methane; Nitrogen; Planting.
Ano: 2017
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/1074307

Especificações padrões para mensurações de gases de efeito estufa e metabolismo de pequenos ruminantes no bioma Caatinga.
Provedor de dados: 14
Autores: ROGERIO, M. C. P.; BORGES, I.; FERREIRA, A. L.; MACHADO, F. S.; POMPEU, R. C. F. F.; GUEDES, L. F.; COSTA, C. dos S.; GUEDES, F. L.; GALVANI, D. B.
Resumo: A respirometria em ensaios com pequenos ruminantes contribui para a mensuração das emissões de gases de efeito estufa (GEE), subsídio ao pagamento por serviços ambientais e para o desenvolvimento de rações e suplementos que propiciem a máxima eficiência alimentar. Para as aferições de emissão de GEE, 15 cordeiras Santa Inês, com peso de 15,09 kg±2,63 kg, foram avaliadas na câmara respirométrica do Laboratório de Respirometria do Semiárido (Laresa) da Embrapa Caprinos e Ovinos. As dietas foram for-muladas conforme as exigências nutricionais descritas pelo NRC (National Research Council, 2007), em planos nutricionais para manutenção, acaba-mento de carcaça precoce e de carcaça tardia, com cinco repetições. As taxas médias de recuperação para CO2 e...
Tipo: Boletim de Pesquisa e Desenvolvimento (INFOTECA-E)
Palavras-chave: Gás carbônico; Energia líquida; Semiárido; Metabolismo nutricional; Caloric increment; Liquid energy; Caprino; Ovino; Incremento Calórico; Metano; Goats; Sheep; Carbon dioxide; Methane; Brazil.
Ano: 2019
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/1117071

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

Sistemas de Integração Lavoura-Pecuária-Floresta como estratégia para neutralização da emissão de metano entérico de bovinos na região do Cerrado de Minas Gerais.
Provedor de dados: 14
Autores: CAMPANHA, M. M.; COSTA, T. C. e C. da; GONTIJO NETO, M. M.; RESENDE, A. V. de; BORGHI, E.
Este trabalho foi desenvolvido com o objetivo de avaliar o potencial de neutralização das emissões de metano entérico de bovinos em pasto, pela fixação de CO2 no componente arbóreo de diferentes modelos para recuperação de pastagens degradadas no Cerrado de Minas Gerais, com diferentes níveis de investimento tecnológico em sistemas de Integração Lavoura-Pecuária-Floresta (ILPF).
Tipo: Circular Técnica (INFOTECA-E)
Palavras-chave: Sistema de Cultivo; Metano; Neutralização; Pastagem; Methane; Neutralization; Pastures.
Ano: 2021
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/1135355

Emissão de metano em cultivo de arroz irrigado sob sistema pré-germinado.
Provedor de dados: 14
Autores: LIMA, M. A. de; VIEIRA, R. F.; LUIZ, A. J. B.; GALVAO, J. A. H.
Resumo: O metano (CH4) é um dos principais gases de efeito estufa provenientes de atividades agrícolas, sendo o arroz irrigado por inundação uma importante fonte. Estudos locais de mensuração de fluxos de gases de efeito estufa em áreas agrícolas têm sido incentivados em nível global com o intuito de subsidiar e refinar estimativas nacionais e estaduais de emissão, bem como validar modelos biogeoquímicos. Este estudo teve como objetivo quantificar a emissão sazonal de CH4 em cultivo de arroz irrigado no município de Tremembé, SP, uma das principais áreas produtoras de arroz deste estado. O experimento foi conduzido na safra de 2008/2009, e utilizou o método de câmara fechada e cromatografia gasosa. Com base na emissão sazonal foi possível estimar o fator...
Tipo: Boletim de Pesquisa e Desenvolvimento (INFOTECA-E)
Palavras-chave: Fator de emissão; Gases de efeito estufa; Metano; Arroz Inundado; Efeito Estufa; Rice; Flooded conditions; Greenhouse gas emissions; Emissions factor; Methane.
Ano: 2021
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/1135994

Changes in seabed morphology, mud temperature and free gas venting at the Håkon Mosby mud volcano, offshore northern Norway, over the time period 2003-2006
Provedor de dados: 5
Autores: Foucher, Jean-paul; Dupre, Stephanie; Scalabrin, Carla; Feseker, Tomas; Harmegnies, Francois; Nouze, Herve.
The Håkon Mosby mud volcano is a 1.5-km-diameter geological structure located on the Southwest Barents Sea slope at a water depth of 1,270 m. High-definition seabed mapping of the mud volcano has been carried out in 2003 and 2006. A comparative analysis of the bathymetry and backscatter maps produced from the two surveys shows subtle morphological changes over the entire crater of the mud volcano, interpreted to be the consequence of mud eruption events. Mud temperature measurements point to a persistently warm mud at shallow depth in the crater. This is explained by upward fluid advection, rather than conductive cooling of mud flows. The small-scale spatial variability in the temperature distribution may be related to mud outflows or changes in the fluid...
Tipo: Text
Palavras-chave: Sw barents sea; Cold seep ecosystems; Fluid flow; Methane; Sediment; Onshore; Fluxes; Margin; Water.
Ano: 2010
URL: http://archimer.ifremer.fr/doc/00004/11527/10261.pdf

Evolution model for the Absheron mud volcano: from in-situ observations to numerical modeling
Provedor de dados: 5
Autores: Blouin, Arthur; Imbert, Patrice; Sultan, Nabil; Callot, Jean-paul.
The morphology of mud volcanoes (MV) has been extensively studied over the last few decades. Although recent research has begun to focus on deep processes and structures, little is known about mud generation mechanisms. This study aims to investigate the feeder system and formation of an active kilometer‐scale MV by relying on a 3‐D seismic survey and an in‐situ dataset on the Absheron anticline (South Caspian Basin). Seismic data show a depleted area in the Anhydritic Surakhany Formation (ASF), whose mineralogical composition fits with surface mud. Well data show that the ASF is a succession of evaporitic beds and low temperature shales near its fracture pressure. Biostratigraphic analysis confirms a Pliocene origin for the mud, suggesting that the ASF...
Tipo: Text
Palavras-chave: Mud volcano; Pore pressure; Methane; Modeling; Seismic.
Ano: 2019
URL: https://archimer.ifremer.fr/doc/00481/59304/62057.pdf

New insigths on the metabolic diversity among the epibiotic microbial communitiy of the hydrothermal shrimp Rimicaris exoculata
Provedor de dados: 5
Autores: Zbinden, M; Shillito, B; Le Bris, Nadine; De Montlaur, C; Roussel, Erwan; Guyot, F; Gaill, F; Cambon-bonavita, Marie-anne.
The Rimicaris exoculata dominates the megafauna of some of the Mid Atlantic ridge hydrothermal vent sites. This species harbors a rich community of bacterial epibionts inside its gill chamber. Literature data indicate that a single 16S rRNA phylotype dominates this epibiotic community, and is assumed to be a sulfide-oxidizing bacteria. However attempts Of Cultivation were not successful and did not allow to confirm it. The aim of our study was to test the hypothesis of sulfide oxidation in the gill chamber, by a multidisciplinary approach, using in vivo experiments at in situ pressure in the presence of sulfide, microscopic observations and a molecular survey. Morphology of microorganisms, before and after treatment, was analyzed to test the effect of...
Tipo: Text
Palavras-chave: Sulfur; Methane; Iron; Intracellular granules; Hydrothermal vent shrimp; High pressure experiments.
Ano: 2008
URL: http://archimer.ifremer.fr/doc/2008/publication-4563.pdf

Role of pockmarks in diversity and species assemblages of coastal macrobenthic communities
Provedor de dados: 5
Autores: Dubois, Stanislas; Derian, Francois; Caisey, Xavier; Rigolet, Carinne; Caprais, Jean-claude; Thiebaut, Eric.
We used existing bathymetric data to study the macrofauna of a geophysical pockmark field restricted to a benthic habitat engineered by the tubiculous amphipod Haploops nirae in South Brittany (France). Stations inside and outside pockmarks of different morphometric characteristics (location, size, depression depth) were sampled for macrofauna and environmental parameters (sediment characteristics, organic matter, chl a, hydrogen sulfide and methane concentrations). Diversity indices showed higher species richness inside pockmarks, especially for species with medium to high abundances. Most sediment cores showed low methane but high hydrogen sulfide concentrations. We hypothesised that after eruption, the remaining residual methane from pockmark sediments...
Tipo: Text
Palavras-chave: Benthic habitat; Biodiversity; Succession; Amphipod; Haploops; South Brittany; Sulfide; Methane; Environmental factors.
Ano: 2015
URL: https://archimer.ifremer.fr/doc/00272/38333/36576.pdf

Geological and biological diversity of seeps in the Sea of Marmara
Provedor de dados: 5
Autores: Ondreas, Helene; Olu, Karine; Dupre, Stephanie; Scalabrin, Carla; Alix, Anne-sophie; Garrocq, Clément; Ruffine, Livio.
The Sea of Marmara hosts part of the North Anatolian Fault as an active submarine strike-slip fault. This area has suffered numerous earthquakes and presents a major seismic risk. Although the Sea of Marmara has been studied for many years, the link between geological morphostructures, the nature of fluids and biological communities is still rarely described. During the Marsite cruise (November 2014), dives with Remotely Operated Vehicle (ROV) VICTOR 6000 focused on detailed seafloor explorations of four different areas: the Central and Western highs and the Tekirdağ and Çinarcik basins. Based on 130 h of in situ videos, high-resolution seafloor mapping of seeps was conducted, emphasizing their significant geological and biological diversity from one...
Tipo: Text
Palavras-chave: Sea of Marmara; Cold seeps; Fluids; Seismogenic faults; Chemosynthetic fauna; Methane.
Ano: 2020
URL: https://archimer.ifremer.fr/doc/00624/73623/73040.pdf

Basin-wide estimates of the input of methane from seeps and clathrates to the Black Sea
Provedor de dados: 5
Autores: Kessler, Jd; Reeburgh, Ws; Southon, J; Seifert, R; Michaelis, W; Tyler, Sc.
Numerous methane-emitting bottom features, such as seeps, methane clathrate hydrates (clathrates), and mud volcanoes, have been identified recently in the Black Sea. The fluxes of methane from these sources averaged over large spatial scales are unknown. Here we take advantage of the fact that the Black Sea is a semi-enclosed basin with restricted deep water circulation to establish first-order estimates of basin-wide fluxes of methane from these sources to the water column and atmosphere. First, we measured tile natural radiocarbon content of methane (C-14-CH4) dissolved in the water column and emitted from seeps. The C-14-CH4 results showed that the dominant source of methane to the water column is emitted from seeps and a smaller source is...
Tipo: Text
Palavras-chave: Methane; Seeps; Methane clathrate hydrates; Black Sea; Methane radiocarbon; Seep methane flux.
Ano: 2006
URL: https://archimer.ifremer.fr/doc/00209/31994/30436.pdf

Differences in gas venting from ultramafic-hosted warm springs: the example of Oman and Voltri Ophiolites
Provedor de dados: 5
Autores: Boulart, Cedric; Chavagnac, Valerie; Monnin, Christophe; Delacour, Adelie; Ceuleneer, Georges; Hoareau, Guilhem.
Serpentinisation of mantle rocks, leading to natural venting of hydrogen and methane, has been reported to occur at the global scale, wherever fluids percolate in ultramafic formations. Here we compare gas composition from two on-land, low-temperature, and hyper-alkaline springs hosted on ultramafic rocks in the ophiolite massifs of the Sultanate of Oman and the Ligurian Alps (Voltri Group, Genoa region, Northern Italy). These two settings exhibit similar chemical and mineralogical features but show diverse styles of gas venting. Commonly to all hyper-alkaline springs, gases are characterised by relatively high N-2, very low O-2 and CO2 concentrations, and a strong enrichment in H-2 and CH4. The comparison between Oman and Liguria highlights a high...
Tipo: Text
Palavras-chave: Methane; Hydrogen; Gas composition; Hyper-alkaline springs. Oman; Voltri Massif.
Ano: 2013
URL: http://archimer.ifremer.fr/doc/00175/28634/27059.pdf

Distribution and behavior of dissolved hydrogen sulfide in hydrothermal plumes
Provedor de dados: 5
Autores: Radford Knoery, Joel; German, C; Charlou, Jean-luc; Donval, Jean-pierre; Fouquet, Yves.
Through the deep ocean, hydrothermal plumes disperse high concentrations of key chemical tracers including He-3, CH4, Mn, Fe, H2S, etc. This paper focuses on the distribution and behavior of total dissolved sulfide (sulfide hereafter) in hydrothermal plumes to show that its plume concentration decreases to subnanomolar a few kilometers from the vents. We also report on sulfide removal rates determined at in situ conditions; we observe that they are two orders of magnitude greater than for open ocean seawater, consistent with sulfide being detected only in the vicinity of hydrothermal vents. From our observations, we infer that the sole presence of sulfide in hydrothermal plumes locates active venting at the kilometer scale.
Tipo: Text
Palavras-chave: Chemical oceanography; Mid ocean ridges; Metals; Helium isotopes; Methane; Tracers; Hydrogen sulphide; Plumes; Hydrothermal activity.
Ano: 2001
URL: https://archimer.ifremer.fr/doc/2001/publication-688.pdf

Archaeal Methane Cycling Communities Associated with Gassy Subsurface Sediments of Marennes-Oleron Bay (France)
Provedor de dados: 5
Autores: Roussel, Erwan; Sauvadet, Anne Laure; Allard, Jonathan; Chaduteau, Carine; Richard, Pierre; Cambon Bonavita, Marie-anne; Chaumillon, Eric.
In Marennes-Oleron Bay, a macro-tidal bay located on the French Atlantic coast, kilometer-scale acoustic turbidity reveals an accumulation of free gas in the sediment. Large concentrations of organic matter and rapid sedimentation rates provide ideal settings for biogenic methane cycling. We integrate seismic, sedimentologic, biogeochemical and molecular genetic approaches to determine whether microbial methane cycling is involved in this process. Here we show that the acoustic turbidity upper boundary matched with X-ray facies displaying fissures with the highest methane concentrations, demonstrating the existence of methane bubbles in the sediment. 16S rRNA and mcrA gene clone libraries were dominated by sequences affiliated to the three known ANME...
Tipo: Text
Palavras-chave: Sediment; Methane; McrA; 16S rRNA; Archaea.
Ano: 2009
URL: http://archimer.ifremer.fr/doc/2009/publication-6165.pdf

Cold-seep assemblages on a giant pockmark off West Africa: spatial patterns and environmental control
Provedor de dados: 5
Autores: Olu, Karine; Caprais, Jean-claude; Fifis, Alexis; Fabri, Marie-claire; Galeron, Joelle; Budzinsky, H; Le Menach, K; Khripounoff, Alexis; Ondreas, Helene; Sibuet, Myriam.
A giant pockmark colonised by dense cold-seep assemblages near 3160 m depth along the Congo-Angola margin has been surveyed by the ROV Victor 6000. The quantitative distribution of chemosynthetic communities was mapped along the dive tracks from a video study using GIS and image mosaicking. Several types of faunal assemblages, either dominated by bivalves of the families Mytilidae (Bathmodiolus sp.) Vesicom idae (Calyptogena sp., 'Vesicomya' aff. chuni), or by Siboglinidae polychaetes (Escarpia southwardae) were mapped over the 800-m diameter pockmark area and sampled for fauna, water and sediment. The isotopic analyses (delta C-13) of tissues from symbiont-bearing species were within the range typical of nutrition via symbiosis using methane for mussels...
Tipo: Text
Palavras-chave: Symbiont bearing species; Spatial distribution; Methane; Megafauna; Cold seeps.
Ano: 2007
URL: http://archimer.ifremer.fr/doc/2007/publication-2681.pdf

Metabolism of CO and CH sub(4) by nitrifiers and the determination of the nitrification rate.
Provedor de dados: 5
Autores: Morita, R; Jones, R.
The nitrifying bacteria were found to survive 24 weeks in the absence of ammonium without decreasing their number of cell size. Because H sub(2), CO, and CH sub(4) are present in the marine environment, these substrates were investigated as a possible source of the energy of maintenance for the nitrifying bacteria. super(14)CO and super(14)CH sub(4) were found to be oxidized by the nitrifiers. N-serve was found to inhibit the oxidation of CO. Using the nitrifiers' ability to oxide CO, a method for the determination of the nitrification rate was developed. The ability of nitrifiers to oxidize CO may play a significant role in the cycling of CO sub(2) in the marine environment. Whether CO and CH sub(4) oxidation play a role in the survival of nitrifiers in...
Tipo: Text
Palavras-chave: Methane; Carbon dioxide; Survival; Bacteria; Nitrification; Nitrogen cycle; Oxidation; Carbon cycle; Biogeochemistry; Metabolism.
Ano: 1984
URL: http://archimer.ifremer.fr/doc/1984/acte-975.pdf

Methane-derived stromatolitic carbonate crust from an active fluid seepage in the western basin of the Sea of Marmara: mineralogical, isotopic and molecular geochemical characterization
Provedor de dados: 5
Autores: Akhoudas, C.; Chevalier, N.; Blanc-valleron, M. -m.; Klein, V.; Mendez-millan, M.; Demange, J.; Dalliah, S.; Rommevaux, V.; Boudouma, O.; Pierre, C.; Ruffine, Livio.
Cold seeps along the North Anatolian fault in the Sea of Marmara (Turkey) were explored during submersible dives of the Marsite cruise in November 2014 when sediments, pore waters and carbonate crusts were sampled at active fluid seeping sites. In this study, we investigate the mineralogy, carbon and oxygen isotopic compositions and the lipid biomarkers of a carbonate crust from the western Tekirdağ basin of the Sea of Marmara. This crust exhibits a laminated domal structure that resembles stromatolite. The mineralogy of authigenic seep-carbonate is mostly represented by aragonite associated with minor amounts of high-magnesian calcite. The abundance of pyrite associated with the authigenic seep-carbonate points to very intense bacterial sulfate reduction....
Tipo: Text
Palavras-chave: Marmara Sea; Tekirdag Basin; Methane; Authigenic seep-carbonate; Sulfate reduction; Anaerobic oxidation of methane; Stromatolitic structure; Stable isotopes; Lipid biomarkers.
Ano: 2018
URL: https://archimer.ifremer.fr/doc/00417/52857/53764.pdf

Influence of CH4 and H2S availability on symbiont distribution, carbon assimilation and transfer in the dual symbiotic vent mussel Bathymodiolus azoricus
Provedor de dados: 5
Autores: Riou, V.; Halary, S.; Duperron, S.; Bouillon, S.; Elskens, M.; Bettencourt, R.; Santos, R. S.; Dehairs, F.; Colaco, A.
High densities of mussels of the genus Bathymodiolus are present at hydrothermal vents of the Mid-Atlantic Ridge. It was previously proposed that the chemistry at vent sites would affect their sulphide- and methane-oxidizing endosymbionts' abundance. In this study, we confirmed the latter assumption using fluorescence in situ hybridization on Bathymodiolus azoricus specimens maintained in a controlled laboratory environment at atmospheric pressure with one, both or none of the chemical substrates. A high level of symbiosis plasticity was observed, methane-oxidizers occupying between 4 and 39% of total bacterial area and both symbionts developing according to the presence or absence of their substrates. Using (HCO3-)-C-13 in the presence of sulphide, or...
Tipo: Text
Palavras-chave: Mid-atlantic ridge; Hydrocarbon-seep mussel; Deep-sea mussels; Hydrothermal-vent; Puteoserpentis bivalvia; Mytilidae; Methane; Endosymbionts; Bacteria; Metabolism.
Ano: 2008
URL: https://archimer.ifremer.fr/doc/00207/31865/30271.pdf

Diversité phylogénétique et fonctionnelle des communautés microbiennes incultivées des sédiments marins de la marge de Sonora, Bassin de Guaymas (Golfe de Californie)
Provedor de dados: 5
Autores: Vigneron, Adrien.
At continental margins, and more particularly in cold seep areas, microbial and animal communities were locally detected at the surface of the sediments. These communities grow using reduced chemical compounds (H2S, Methane, COZ ...) contained in the percolated cold fluids and produced by both geological and microbial processes. ln order to study microbial community diversity in these ecosystems and their role in the environment as well as to understand the environmental factors influencing the distribution and ecophysiology of these communities, surface (0-20 cmbsf) but also deeper (&lt;9 mbsf) sediments were collected at the Sonora Margin. Microbial communities have been studied using various molecular, cultural and microscopy approaches. This research...
Tipo: Text
Palavras-chave: Fluides froids; Marge de Sonora; Bassin de Guaymas; Diversité moléculaire; Communautés microbiennes; Archaea; Bacteria; Méthanogènes; Methanogens; Microbial communities; Molecular diversity; Guaymas Basin; Sonora Margin; ANME; SRb; Methane; Sediments; Cold seeps.
Ano: 2012
URL: https://archimer.ifremer.fr/doc/00498/60956/64359.pdf

Origin of Short-Chain Organic Acids in Serpentinite Mud Volcanoes of the Mariana Convergent Margin
Provedor de dados: 5
Autores: Eickenbusch, Philip; Takai, Ken; Sissman, Olivier; Suzuki, Shino; Menzies, Catriona; Sakai, Sanae; Sansjofre, Pierre; Tasumi, Eiji; Bernasconi, Stefano M.; Glombitza, Clemens; Jorgensen, Bo Barker; Morono, Yuki; Lever, Mark Alexander.
Serpentinitic systems are potential habitats for microbial life due to frequently high concentrations of microbial energy substrates, such as hydrogen (H-2), methane (CH4), and short-chain organic acids (SCOAs). Yet, many serpentinitic systems are also physiologically challenging environments due to highly alkaline conditions (pH &gt; 10) and elevated temperatures (&gt;80 degrees C). To elucidate the possibility of microbial life in deep serpentinitic crustal environments, International Ocean Discovery Program (IODP) Expedition 366 drilled into the Yinazao, Fantangisfia, and Asut Tesoru serpentinite mud volcanoes on the Mariana Forearc. These mud volcanoes differ in temperature (80, 150, 250 degrees C, respectively) of the underlying subducting slab, and...
Tipo: Text
Palavras-chave: Limits of life; Deep biosphere; Serpentinization; Abiotic synthesis; Formate; Acetate; Methane; International Ocean Discovery Program.
Ano: 2019
URL: https://archimer.ifremer.fr/doc/00637/74919/75981.pdf

Seafloor geological studies above active gas chimneys off Egypt (Central nile deep sea fan)
Provedor de dados: 5
Autores: Dupre, Stephanie; Woodside, J; Foucher, Jean-paul; De Lange, G; Mascle, J; Boetius, A; Mastalerz, V; Stadnitskaia, A; Ondreas, Helene; Huguen, C; Harmegnies, Francois; Gontharet, Swanne; Loncke, L; Deville, E; Niemann, H; Omoregie, E; Olu, Karine; Fiala Medioni, A; Dahlmann, A; Caprais, Jean-claude; Prinzhofer, A; Sibuet, Myriam; Pierre, C; Damste, J.
Four mud volcanoes of several kilometres diameter named Amon, Osiris, Isis, and North Alex and located above gas chimneys on the Central Nile Deep Sea Fan, were investigated for the first time with the submersible Nautile. One of the objectives was to characterize the seafloor morphology and the seepage activity across the mud volcanoes. The seepage activity was dominated by emissions of methane and heavier hydrocarbons associated with a major thermal contribution. The most active parts of the mud volcanoes were highly gas-saturated (methane concentrations in the water and in the sediments, respectively, of several hundreds of nmol/L and several mmol/L of wet sediment) and associated with significantly high thermal gradients (at 10 m below the seafloor,...
Tipo: Text
Palavras-chave: Seafloor morphology; Methane; Authigenic carbonate precipitation; Gas chimneys; Mud breccia; Mud volcanoes; Fluid seepage; Nile fan.
Ano: 2007
URL: http://archimer.ifremer.fr/doc/2007/publication-4455.pdf

Methane in shallow subsurface sediments at the landward limit of the gas hydrate stability zone offshore Western Svalbard
Provedor de dados: 5
Autores: Graves, Carolyn A.; James, Rachael H.; Sapart, Celia Julia; Stott, Andrew W.; Wright, Ian C.; Berndt, Christian; Westbrook, Graham; Connelly, Douglas P.
Offshore western Svalbard plumes of gas bubbles rise from the seafloor at the landward limit of the gas hydrate stability zone (LLGHSZ; ∼400 m water depth). It is hypothesized that this methane may, in part, come from dissociation of gas hydrate in the underlying sediments in response to recent warming of ocean bottom waters. To evaluate the potential role of gas hydrate in the supply of methane to the shallow subsurface sediments, and the role of anaerobic oxidation in regulating methane fluxes across the sediment-seawater interface, we have characterised the chemical and isotopic compositions of the gases and sediment pore waters. The molecular and isotopic signatures of gas in the bubble plumes (C1/C2+ = 1 × 104; δ13C-CH4 = -55 to -51 ‰; δD-CH4 = -187...
Tipo: Text
Palavras-chave: Methane; Seafloor sediments; Gas hydrate; Offshore Svalbard; Seabed fluxes; Anaerobic oxidation.
Ano: 2017
URL: http://archimer.ifremer.fr/doc/00358/46914/46819.pdf

Deep-sea ophiuroids (Echinodermata) from reducing and non-reducing environments in the North Atlantic Ocean
Provedor de dados: 5
Autores: Stohr, Sabine; Segonzac, Michel.
The animal communities associated with the deep-sea reducing environment have been studied for almost 30 years, but until now only a single species of ophiuroid, Ophioctenella acies, has been found at both hydrothermal vents and methane cold seeps. Since the faunal overlap between vent and seep communities is small and many endemic species have been found among other taxa (e.g. Mollusca, Crustacea), additional species of ophiuroids were expected at previously unstudied sites. Chemical compositions at reducing sites differ greatly from the nearby bathyal environment. Generally, species adapted to chemosynthetic environments are not found in non-chemosynthetic habitats, but occasional visitors of other bathyal species to vent and seep sites have been...
Tipo: Text
Palavras-chave: Habitat description; Distribution record; Seeps; Methane; Hydrothermal vents; Ophiuroids.
Ano: 2005
URL: http://archimer.ifremer.fr/doc/2005/publication-427.pdf

Shallow gas hydrate accumulations at a Nigerian deep‐water pockmark ‐ Quantities and dynamics
Provedor de dados: 5
Autores: Pape, Thomas; Ruffine, Livio; Hong, Wei‐li; Sultan, Nabil; Riboulot, Vincent; Peters, Carl A.; Kölling, Martin; Zabel, Matthias; Garziglia, Sebastien; Bohrmann, Gerhard.
The evolution of submarine pockmarks is often related to the ascent of fluid from the subsurface. For pockmarks located within the gas hydrate stability zone, methane oversaturation can result in the formation of gas hydrates in the sediment. A ca. 600 m‐wide sea floor depression in deep‐waters offshore Nigeria, Pockmark A, was investigated for distributions and quantities of shallow gas hydrates, origins of hydrocarbons and time elapsed since the last major fluid ascent event. For the first time, pressure coring of shallow sediments and drilling of more than 50‐m‐long cores with the sea floor drill rig MARUM‐MeBo70 were conducted in this pockmark. Unusually high hydrate saturations of up to 51% of pore volume in the uppermost 2.5 meters of sediment in the...
Tipo: Text
Palavras-chave: Pockmark; Gas hydrate; Methane; MeBo; Pressure coring; Pore water modeling.
Ano: 2020
URL: https://archimer.ifremer.fr/doc/00643/75491/76344.pdf

Comparative Study of Guaymas Basin Microbiomes: Cold Seeps vs. Hydrothermal Vents Sediments
Provedor de dados: 5
Autores: Cruaud, Perrine; Vigneron, Adrien; Pignet, Patricia; Caprais, Jean-claude; Lesongeur, Francoise; Toffin, Laurent; Godfroy, Anne; Cambon-bonavita, Marie-anne.
In the Guaymas Basin, the presence at a few tens of kilometers of cold seeps and hydrothermal vents coupled with comparable sedimentary settings and depths offer a unique opportunity to assess and compare the microbial community composition of these deep-sea ecosystems. The microbial diversity in sediments from three cold seep and two hydrothermal vent assemblages were investigated using high-throughput 16S rRNA-sequencing. Numerous bacterial and archaeal lineages were detected in both cold seep and hydrothermal vent sediments. Various potential organic matter degraders (e.g., Chloroflexi, Atribacteria, MBG-D) and methane and sulfur cycling related microorganisms (e.g., ANME and methanogenic lineages, sulfate-reducing lineages) were detected in both...
Tipo: Text
Palavras-chave: Microbial diversity; Hydrothermal vents; Cold seeps; Ribotypes; Methane; Extreme environments.
Ano: 2017
URL: https://archimer.ifremer.fr/doc/00415/52640/53496.pdf

Modern sedimentation and geochemical imprints in sediments from the NW Madagascar margin
Provedor de dados: 5
Autores: Pastor, Lucie; Brandily, Christophe; Schmidt, S.; Miramontes, E.; Péron, Maela; Appere, Dennis; Chéron, Sandrine; Boissier, Audrey; Jouet, Gwenael.
The NW Madagascar continental margin receives high loads of terrigenous particulate organic matter during the wet season and especially linked to extreme events, originating from two major rivers, the Betsiboka and the Mahavavy Rivers. This particulate matter contains a high content of iron minerals from the weathering of red ferruginous/ferralitic soils of Madagascar. The presence of pockmarks, i.e. gas or fluid expulsion features on the continental slope, testifies to past/present methane migration through the sedimentary column, associated with early diagenetic processes. This study globally aims at deciphering the interactions between episodic sedimentation and geochemical processes influenced by fluids upward migration, using a sediment trap mooring...
Tipo: Text
Palavras-chave: Episodic sedimentation; Madagascar margin; Betsiboka river; Mahavavy river; Progradation; Methane; Geochemistry; Sediment.
Ano: 2020
URL: https://archimer.ifremer.fr/doc/00628/73964/73323.pdf

Evolution model for the Absheron Mud Volcano: from stratified sediments to fluid mud generation
Provedor de dados: 5
Autores: Blouin, Arthur; Sultan, Nabil; Pierron, Alexandra; Imbert, Patrice; Callot, Jean‐paul.
Submarine mud volcanoes are one of the most spectacular methane expulsion features at the seafloor and they represent a significant geohazard worldwide. In this work we focus on the physical processes controlling the initiation and early evolution of the Absheron mud volcano (AMV). Our analyses were carried out based on basin modeling calibrated thanks to existing seismic interpretation of the AMV, analysis of sediment samples from seabed, and data from two exploration wells. Acquired laboratory geotechnical data allowed us to derive laws considering the impact of gas exsolution on host sediment behaviors. In this study, we identified key geological and physical conditions that led to mud volcano formation: by coupling diffusion processes with...
Tipo: Text
Palavras-chave: Mud volcano; Numerical modeling; Geohazard; Sediment remobilization; Methane.
Ano: 2020
URL: https://archimer.ifremer.fr/doc/00658/77002/78258.pdf

Sulfate-dependent anaerobic oxidation of methane at a highly dynamic bubbling site in the Eastern Sea of Marmara (Çinarcik Basin)
Provedor de dados: 5
Autores: Teichert, B. M. A.; Chevalier, N.; Gussone, N.; Bayon, Germain; Ponzevera, Emmanuel; Ruffine, Livio; Strauss, H.
During the MARSITECruise expedition in November 2014 on board the RV Pourquoi Pas?, multidisciplinary sampling was carried out with the ROV Victor 6000 in order to investigate biogeochemical processes taking place at cold seep environments in the Sea of Marmara. Pore water, bottom water, sediment and authigenic carbonate samples were collected from two short push cores (MRS-DV5-PC04 − 8 cm, MRS-DV5-PC01 − 12.5 cm) at an active methane bubbling site in the southeastern part of the Çinarcik Basin. Sulfate sulfur and oxygen isotope data as well as sulfide isotope data indicate that sulfate-dependent anaerobic oxidation of methane is the dominant process in the sediments. This is confirmed by archaeal lipids diagnostic for anaerobic methane oxidizers detected...
Tipo: Text
Palavras-chave: Sea of Marmara; Cinarcik Basin; Methane; Sulfate reduction; Anaerobic oxidation of methane; Authigenic carbonate; Lipid biomarker.
Ano: 2018
URL: https://archimer.ifremer.fr/doc/00413/52480/53267.pdf

Disentangling Drought and Nutrient Effects on Soil Carbon Dioxide and Methane Fluxes in a Tropical Forest
Provedor de dados: 5
Autores: Bréchet, Laëtitia; Courtois, Elodie A.; Saint-germain, Thomas; Janssens, Ivan A.; Asensio, Dolores; Ramirez-rojas, Irene; Soong, Jennifer L.; Van Langenhove, Leandro; Verbruggen, Erik; Stahl, Clément.
Tropical soils are a major contributor to the balance of greenhouse gas (GHG) fluxes in the atmosphere. Models of tropical GHG fluxes predict that both the frequency of drought events and changes in atmospheric deposition of nitrogen (N) will significantly affect dynamics of soil carbon dioxide (CO2) and methane (CH4) production and consumption. In this study, we examined the combined effect of a reduction in precipitation and an increase in nutrient availability on soil CO2 and CH4 fluxes in a primary French Guiana tropical forest. Drought conditions were simulated by intercepting precipitation falling through the forest canopy with tarpaulin roofs. Nutrient availability was manipulated through application of granular N and/or phosphorus (P) fertilizer to...
Tipo: Text
Palavras-chave: Carbon dioxide; Drought; Fertilization; Methane; Nitrogen; Phosphorus; Soil GHG fluxes; Tropical forest.
Ano: 2019
URL: https://archimer.ifremer.fr/doc/00595/70694/68903.pdf

Diversité et activité des communautés microbiennes dans des sédiments marins associés aux émissions de fluides froids
Provedor de dados: 5
Autores: Lazar, Cassandre Sara.
A large portion of the greenhouse gas methane on Earth is trapped in marine sediments. However, little methane actually reaches the hydrsphere and the atmosphere, because it is efficiently consumed by anaerobic methane-oxidizing Archaea (ANME). This methane is mainly biogenic in marine sédiments, and is produced by methanogenic Archaea. Methane ascends from deep sources to the seabed, in cold seep sites of continental margins. In order to study microbial community diversity in cold seeps, and to determine geochemical factors that control these microbial communities, we compared four geochemically and geologically distinct sites. In this work, molecular tools (PCR, RT-PCR, DGGE, cloning) as well as genetic markers (16S rRNA, mcrA, dsrB) were employed, to...
Tipo: Text
Palavras-chave: Diversité moléculaire; Archaea; Méthanogène; ANME; McrA; DsrB; DGGE; Volcan de boue; Pockmark; Saumures; Fluides froids; Méthane; Mer de Norvège; Mer Méditerranée; Sédiments.; Molecular diversity; Archaea; Methanogen; ANME; McrA; DsrB; DGGE; Mud volcano; Pockmark; Brines; Cold seep; Methane; Norwegian Sea; Mediterranean Sea; Sediments.
Ano: 2010
URL: http://archimer.ifremer.fr/doc/00031/14250/11534.pdf

Tracing carbon assimilation in endosymbiotic deep-sea hydrothermal vent Mytilid fatty acids by C-13-fingerprinting
Provedor de dados: 5
Autores: Riou, V.; Bouillon, S.; Serrao Santos, R.; Dehairs, F.; Colaco, A.
Bathymodiolus azoricus mussels thrive at Mid-Atlantic Ridge hydrothermal vents, where part of their energy requirements are met via an endosymbiotic association with chemolithotrophic and methanotrophic bacteria. In an effort to describe phenotypic characteristics of the two bacterial endosymbionts and to assess their ability to assimilate CO2, CH4 and multi-carbon compounds, we performed experiments in aquaria using C-13-labeled NaHCO3 (in the presence of H2S), CH4 or amino-acids and traced the incorporation of C-13 into total and phospholipid fatty acids (tFA and PLFA, respectively). 14:0; 15:0; 16:0; 16:1(n - 7) c+t; 18:1(n - 13) c+t and (n - 7) c+t; 20:1(n - 7); 20:2(n - 9,15); 18:3(n - 7) and (n - 5,10,13) PLFA were labeled in the presence of...
Tipo: Text
Palavras-chave: Mid atlantic ridge; Mussel bathymodiolus azoricus; Methanotrophic bacteria; Marine invertebrates; Diversity; Organic compounds; Lipid composition; Dual symbiosis; Methane; Biomarkers.
Ano: 2010
URL: https://archimer.ifremer.fr/doc/00207/31868/30275.pdf

Origine et circulation des fluides dans les sédiments des marges. Contribution de l'hélium et du méthane dans la compréhension des processus. Étude de 2 zones actives
Provedor de dados: 5
Autores: Chaduteau, Carine.
Fluid migration is a very important process in marine sediments on margins. Studying fluids is fundamental to constrain the energy potential of margins. Methane is the predominant gas in marine sediments, deriving primarily from the degradation of organic matter. However methane could be also generated through the serpentinization of mantle rocks underlying the sedimentary cover in some specific geodynamical settings. One way to test this hypothesis is to use helium isotopes, which are known to be powerful tracers of the fluid-mantle interaction. To this purpose, a new method has been developed for the sampling and the quantitative extraction of dissolved helium from sediment pore-waters. During the Zairov2 and Vicking cruises, samples were collected in...
Tipo: Text
Palavras-chave: Mantle; Serpentinization; Advection; Mud volcano; Pockmark; Methane; Helium; Fluid; Margin; Manteau; Serpentinisation; Advection; Volcan de boue; Pockmark; Méthane; Hélium; Fluide; Marge.
Ano: 2008
URL: http://archimer.ifremer.fr/doc/2008/these-3724.pdf

Climatically driven emissions of hydrocarbons from marine sediments during deglaciation
Provedor de dados: 5
Autores: Hill, T. M.; Kennett, J. P.; Valentine, D. L.; Yang, Z.; Reddy, C. M.; Nelson, R. K.; Behl, R. J.; Robert, C.; Beaufort, L.
Marine hydrocarbon seepage emits oil and gas, including methane (approximate to 30 Tg of CH4 per year), to the ocean and atmosphere. Sediments from the California margin contain preserved tar, primarily formed through hydrocarbon weathering at the sea surface. We present a record of variation in the abundance of tar in sediments for the past 32,000 years, providing evidence for increases in hydrocarbon emissions before and during Termination IA [16,000 years ago (16 ka) to 14 ka] and again over Termination IB (11-10 ka). Our study provides direct evidence for increased hydrocarbon seepage associated with deglacial warming through tar abundance in marine sediments, independent of previous geochemical proxies. Climate-sensitive gas hydrates may modulate...
Tipo: Text
Palavras-chave: Methane; Paleoclimate; Quaternary climate; Hydrate; Tar.
Ano: 2006
URL: https://archimer.ifremer.fr/doc/00234/34524/33432.pdf

Multidisciplinary investigation on cold seeps with vigorous gas emissions in the Sea of Marmara (MarsiteCruise): Strategy for site detection and sampling and first scientific outcome
Provedor de dados: 5
Autores: Ruffine, Livio; Ondreas, Helene; Blanc-valleron, Marie-madeleine; Teichert, Barbara M. A.; Scalabrin, Carla; Rinnert, Emmanuel; Birot, Dominique; Croguennec, Claire; Ponzevera, Emmanuel; Pierre, Catherine; Donval, Jean-pierre; Alix, Anne-sophie; Germain, Yoan; Bignon, Laurent; Etoubleau, Joel; Caprais, Jean-claude; Knoery, Joel; Lesongeur, Francoise; Thomas, Bastien; Roubi, Angelique; Legoix, Ludovic Nicolas; Burnard, Pete; Chevalier, Nicolas; Lu, Hailong; Dupre, Stephanie; Fontanier, Christophe; Dissard, Delphine; Olgun, Nazli; Yang, Hailin; Strauss, Harald; Ozaksoy, Volkan; Perchoc, Jonathan; Podeur, Christian; Tarditi, Corinne; Ozbeki, Eyyup; Guyader, Vivien; Marty, Bernard; Madre, David G; Pitel-roudaut, Mathilde; Grall, Celine; Embriaco, Davide; Polonia, Mina; Gasperini, Lucas; Cagatay, M. Namik; Henry, Pierre; Geli, Louis.
MarsiteCruise was undertaken in October/November 2014 in the Sea of Marmara to gain detailed insight into the fate of fluids migrating within the sedimentary column and partially released into the water column. The overall objective of the project was to achieve a more global understanding of cold-seep dynamics in the context of a major active strike-slip fault. Five remotely operated vehicle (ROV) dives were performed at selected areas along the North Anatolian Fault and inherited faults. To efficiently detect, select and sample the gas seeps, we applied an original procedure. It combines sequentially (1) the acquisition of ship-borne multibeam acoustic data from the water column prior to each dive to detect gas emission sites and to design the tracks of...
Tipo: Text
Palavras-chave: Acoustic survey; Authigenic carbonates; Biogeochemistry; Chemical analyses; Cold seeps; Dissolved major elements; Fluid seepage; Geology; In situ Raman analysis; Methane; ROV dives.
Ano: 2018
URL: https://archimer.ifremer.fr/doc/00433/54434/55783.pdf

Gas Hydrate Estimate in an Area of Deformation and High Heat Flow at the Chile Triple Junction
Provedor de dados: 5
Autores: Villar-muñoz, Lucía; Vargas-cordero, Iván; Bento, Joaquim; Tinivella, Umberta; Fernandoy, Francisco; Giustiniani, Michela; Behrmann, Jan; Calderón-díaz, Sergio.
Large amounts of gas hydrate are present in marine sediments offshore Taitao Peninsula, near the Chile Triple Junction. Here, marine sediments on the forearc contain carbon that is converted to methane in a regime of very high heat flow and intense rock deformation above the downgoing oceanic spreading ridge separating the Nazca and Antarctic plates. This regime enables vigorous fluid migration. Here, we present an analysis of the spatial distribution, concentration, estimate of gas-phases (gas hydrate and free gas) and geothermal gradients in the accretionary prism, and forearc sediments offshore Taitao (45.5°–47° S). Velocity analysis of Seismic Profile RC2901-751 indicates gas hydrate concentration values &lt;10% of the total rock volume and extremely...
Tipo: Text
Palavras-chave: BSR; Gas hydrate; Methane; Seepage; Active margin; Chile Triple Junction.
Ano: 2019
URL: https://archimer.ifremer.fr/doc/00475/58678/61173.pdf

Stability of mixed gas hydrates and mass transfer during formation, accumulation and destabilization: laboratory experiment and modeling
Provedor de dados: 5
Autores: Legoix, Ludovic.
Gas hydrates are fascinating ice-like compounds made of water cages that retain various types of guest molecules. Natural gas hydrates on Earth form below the seafloor and permafrost and contain mainly methane (CH4). Methane from hydrate deposits could be considered as an energy resource. One possible production scenario of CH4 from hydrates is the injection of carbon dioxide (CO2) or carbon dioxide-nitrogen(CO2-N2) mixed gas into the reservoir. Depending on the thermodynamic constraints, the composition of the gas hydrate guest molecules changes: the energy source CH4 is released and the greenhouse gas CO2 is trapped. The aim of the present work is to study the mixed gas hydrates that form in gas hydrate reservoirs after injection of CO2 or CO2-N2 gas...
Tipo: Text
Palavras-chave: Gas hydrates; Methane; Carbon dioxide; Thermodynamic.
Ano: 2019
URL: https://archimer.ifremer.fr/doc/00490/60183/63524.pdf

Greenhouse gases emission and sustainable development of animal agriculture
Provedor de dados: 19
Autores: Takahashi, Junichi; 高橋, 潤一.
2006年8月3日とかちプラザ・レインボーホールで開催､日本ユネスコ国内委員会主催の帯広農村開発教育国際セミナー(OASERD)国際連合ユネスコアジア太平洋地域教育開発計画事業(APEID)シンポジウム｢地球にやさしい農畜産業をめざして : 温室効果ガスの発生と制御」講演資料
Palavras-chave: Global warming; Greenhouse gas; Nitrous oxide; Methane; Kyoto Protocol.
Ano: 2006
URL: http://ir.obihiro.ac.jp/dspace/handle/10322/1892

Evaluation of Techniques That Measure Hydrogen and Methane Levels in Breaths of Horses with Gastrointestinal Diseases
Provedor de dados: 19
Autores: SASAKI, Naoki; FUKUNAKA, Morito; YAMADA, Haruo; SENBA, Hiroyuki; HIGUCHI, Tohru; 佐々木, 直樹.
Techniques for measuring hydrogen (H2) and methane (CH4) levels in breaths were assessed in horses with gastrointestinal (GI) diseases. A total of 31 horses were studied: 11 healthy horses (Group A), 10 horses with GI diseases (Group B), and 10 horses with diseases without GI involvement (Group C). Expired gases were measured using gas chromatography. CH4 levels in Group A were significantly lower than those in Group B. In Group B, CH4 levels were significantly higher after treatment. Fluctuations in H2 and CH4 levels in breath were associated with changes in GI function.
Palavras-chave: Equine; Hydrogen; Methane.
Ano: 2006
URL: http://ir.obihiro.ac.jp/dspace/handle/10322/3102

Field application of anerobically co-digested dairy manure and food processing wastes for a winter wheat cultivar Hokushin
Provedor de dados: 19
Autores: 梅津, 一孝; 山縣, 真人; 岸本, 正; 谷, 昌幸; 林, 峰之; 三崎, 卓也.
The purpose of this study was to evaluate the effect of anerobically co-digested dairy manure and food processing wastes as an organic fertilizer, and to investigate the changes in soil nitrogen and grain yield of winter wheat (Hokushin) comparing digested dairy manure with chemical fertilizer. By the incubation test, it was clear that the NH4-N was almost converted into the NO3-N for four weeks. Over the period of 101 days, 15% of inorganic N was accumulated in the soil. Between grain yields where co-digested dairy manure and chemical fertilizer were applied, there were no significant difference, but protein contents in grain were higher in co-digested manure applied than chemical fertilizer one (p&lt;0.05).
Palavras-chave: バイオガス; メタン; 消化液; 圃場還元; 秋蒔き小麦; Biogas; Methane; Digested slurry; Field application; Winter wheat.
Ano: 2003
URL: http://ir.obihiro.ac.jp/dspace/handle/10322/4513

The Relationship of Sulfate-methane Interface, the Methane Flux and the Underlying Gas Hydrate.
Provedor de dados: 20
Autores: Fang, Yinxia; Chu, Fengyou.
The sulfate-methane interface is an important biogeochemical identification interface for the areas with high methane flux and containing gas hydrate. Above the sulfate-methane interface, the sulfate concentration in the sediment is consumed progressively for the decomposition of the organic matter and anaerobic methane oxidation. Below the sulfate-methane interface, the methane concentration increases continuously with the depth. Based on the variation characters of the sulfate and methane concentration around the sulfate-methane interface, it is feasible to estimate the intensity of the methane flux, and thereafter to infer the possible occurrence of gas hydrate. The geochemical data of the pore water taken from the northern slope of the South China Sea...
Tipo: Journal Contribution
Palavras-chave: Gas hydrates; Methane; Interfaces; Sulfates.
Ano: 2008
URL: http://hdl.handle.net/1834/5880

Weed Interference in the Establishment of Urochloa ruziziensis
Provedor de dados: 87
Autores: LOURENÇO,A.A.; MOTA,R.V.; SANCHES,J.L.; MARQUES,R.F.; MARCHI,S.R.
ABSTRACT: This research aimed to study weed interference relationship on morphogenesis, yield, and greenhouse gas production potential of Urochloa ruziziensis under pasture renovation conditions. The experimental design was a randomized block design with four replications. Treatments consisted of seven coexistence periods: 0, 15, 30, 45, 60, 75, and 90 days after emergence (DAE). The following morphological parameters were analyzed: number of tillers, number of leaves, photosynthetically active leaf blade biomass, fresh stem biomass, dead material biomass, and total dry biomass. In vitro analyses of methane (CH4) and carbon dioxide (CO2) production were also carried out. The results were submitted to analysis of variance by the F-test, and the test of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Pasture renovation; Weed competition; Morphogenesis; Carbon dioxide; Methane.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582019000100272

The role of cattle genetically efficient in feed utilisation in an Australian carbon trading environment
Provedor de dados: 31
Autores: Arthur,   Paul F.; Herd,   Robert M.; Basarab,   John A.
Special Edition Sheep and Cattle Production in New South Wales
Tipo: Article
Palavras-chave: Feed efficiency; Residual feed intake; Methane; Greenhouse gas; Emission; Beef cattle; Farm Management.
Ano: 2011
URL: http://purl.umn.edu/121457

Greenhouse Gas Emission Factor Module: Land Use in Rural New Zealand—Climate Version 1
Provedor de dados: 31
Autores: Hendy,   Joanna; Kerr,   Suzi.
Several different New Zealand economic models produce measures of rural economic activity that have greenhouse gas implications. For climate change analysis, models need to translate economic activity into greenhouse gas emissions. This document estimates functions and creates projections for land-use related greenhouse gas emissions per unit of economic activity that are simple; are based on readily available data and strong science; are consistent with the national inventory in 2002; evolve so that implied net emissions approximately match past inventory totals (1990–2002); and can be linked easily to a variety of models so they can be used in simulations. We estimate dynamic greenhouse gas emission functions for five land uses: dairy, sheep, beef,...
Tipo: Conference Paper or Presentation
Palavras-chave: Climate change; Greenhouse gases; Methane; Nitrous oxide; Carbon dioxide; Scrub; Forest; Agricultural and Food Policy; Crop Production/Industries; Environmental Economics and Policy; Food Consumption/Nutrition/Food Safety; International Relations/Trade; Research Methods/ Statistical Methods; Resource /Energy Economics and Policy.
Ano: 2005
URL: http://purl.umn.edu/98501

The likely regional impacts of an agricultural emissions policy in New Zealand: Preliminary analysis
Provedor de dados: 31
Autores: Sin,   Isabelle; Brunton,   Emma; Hendy,   Joanna; Kerr,   Suzi.
Hendy and Kerr (2005b) find that an emissions charge on agricultural methane and nitrous oxide of $25 per tonne of carbon dioxide (CO2) equivalent would be likely to reduce New Zealand‘s net land-use related emissions for commitment period one in the order of 3%, with full accounting. The costs per farmer and as a percentage of profit would be very high. This paper considers the regional impacts of such a policy in New Zealand by allocating the emission charge across space according to the location of animals. We then combine our emissions charge information with data on the socio-economic characteristics of the affected areas. Obviously rural areas are heavily affected. In many respects, for example median income, ethnic mix, and percentage of working...
Tipo: Conference Paper or Presentation
Palavras-chave: Climate change; Land use; Social impacts; Methane; Nitrous oxide; Dairy; Sheep; Beef; Distribution of costs; Regional; Agribusiness; Community/Rural/Urban Development; Crop Production/Industries; Environmental Economics and Policy; Farm Management; Land Economics/Use; Livestock Production/Industries; Q25; Q28; R14.
Ano: 2005
URL: http://purl.umn.edu/98506

Towards an Integrated Global Agricultural Greenhouse Gas Model: Greenhouse Gases from Agriculture Simulation Model (GreenAgSiM)
Provedor de dados: 31
Autores: Dumortier,   Jerome; Hayes,   Dermot J.
The Greenhouse Gases from Agriculture Simulation Model (GreenAgSiM) presented in this paper aims to quantify emissions from agricultural activity on a global scale. The model takes emissions into account that are directly attributable to agricultural production, such as enteric fermentation (methane), manure management (methane and nitrous oxide), and agricultural soil management (nitrous oxide). Furthermore, carbon stock differences from land-use change (carbon dioxide) induced by agriculture are included in the model. The model will provide policy makers with information about the greenhouse gas implications of policy changes.
Tipo: Working or Discussion Paper
Palavras-chave: Agriculture; Greenhouse gas emissions; Land-use change; Methane; Nitrous oxide; Soil carbon.; Resource /Energy Economics and Policy.
Ano: 2009
URL: http://purl.umn.edu/49760

Greenhouse gas emissions from agriculture in the EU: A spatial assessment of sources and abatement costs
Provedor de dados: 31
Autores: de Cara,   Stephane; Houze,   Martin; Jayet,   Pierre-Alain.
Agriculture contributes significantly to the emissions of greenhouse gases in the EU. By using a farm-type, linear-programming based model of the European agricultural supply, we first assess the initial levels of methane and nitrous oxide emissions at the regional level in the EU. For a range of CO2 prices, we assess the potential abatement that can be achieved through an IPCC-based emission tax in EU agriculture, as well as the resulting optimal mix of emission sources in the total abatement. Further, we show that the spatial variability of the abatement actually achieved at a given carbon price is large, indicating that abatement cost heterogeneity is a fundamental feature in the design of a mitigation policy. We assess the efficiency loss associated...
Tipo: Conference Paper or Presentation
Palavras-chave: Climate change; Greenhouse gas emissions; Agriculture; Methane; Nitrous oxide; European Union; Marginal abatement costs; Environmental Economics and Policy; Q25; Q15.
Ano: 2004
URL: http://purl.umn.edu/58401

Carbon Markets and Methane Digesters:  Potential Implications for the Dairy Sector
Provedor de dados: 31
Autores: Key,   Nigel D.; Sneeringer,   Stacy E.
Anaerobic digesters that capture and burn manure methane can provide a renewable source of energy and reduce greenhouse gas emissions. Paying producers for these emission reductions—either directly or through a carbon offset market—could substantially increase digester adoption. However, there is likely to be wide variation in the scale, location, and characteristics of adopters, so these policies could have long run structural implications for the livestock sector. Using a model of digester profits and data from a nationally-representative survey of dairy operations we estimate the likely distribution of digester adoption and profits under different carbon price scenarios.
Tipo: Journal Article
Palavras-chave: Anaerobic digester; Carbon offsets; Climate change; Distribution; Livestock; Methane; Environmental Economics and Policy; Q12; Q16; Q42; Q54; Q58.
Ano: 2011
URL: http://purl.umn.edu/117952

Carbon Prices Required to Make Digesters Profitable on U.S. Dairy Farms of Different Sizes
Provedor de dados: 31
Autores: Lazarus,   William F.; Goodkind,   Andrew; Gallagher,   Paul W.; Conway,   Roger K.
Replaced with revised version of paper 02/15/11.
Tipo: Working or Discussion Paper
Palavras-chave: Anaerobic digester; Biogas plant; Livestock manure; Electricity; Methane; Carbon offset value; Environmental Economics and Policy; Livestock Production/Industries.
Ano: 2011
URL: http://purl.umn.edu/98628

Air Emissions of Ammonia and Methane from Livestock Operations: Valuation and Policy Options
Provedor de dados: 31
Autores: Shih,   Jhih-Shyang; Burtraw,   Dallas; Palmer,   Karen L.; Siikamaki,   Juha.
The animal husbandry industry is a major emitter of methane, which is an important greenhouse gas. The industry is also a major emitter of ammonia, which is a precursor of fine particulate matter, arguably the number-one environment-related public health threat facing the nation. We present an integrated process model of the engineering economics of technologies to reduce methane and ammonia emissions at dairy operations in California. Three policy options are explored: greenhouse gas offset credits for methane control, particulate matter offset credits for ammonia control, and expanded net metering policies to provide revenue for the sale of electricity generated from captured methane gas. Individually, any of these policies appears to be sufficient to...
Tipo: Working or Discussion Paper
Palavras-chave: Methane; Ammonia; Carbon dioxide; Greenhouse gases; Climate change; Offset; Particulate matter; Net metering; Environmental policy; CAFO; Manure management; Biodigester; Electricity; Global warming; Cost-benefit; Incentive approach; Livestock Production/Industries; Q2; Q4; Q53.
Ano: 2006
URL: http://purl.umn.edu/10749

Climate Change Policy and the Adoption of Methane Digesters on Livestock Operations
Provedor de dados: 31
Autores: Key,   Nigel D.; Sneeringer,   Stacy E.
Methane digesters—biogas recovery systems that use methane from manure to generate electricity—have not been widely adopted in the United States because costs have exceeded benefits to operators. Burning methane in a digester reduces greenhouse gas emissions from manure management. A policy or program that pays producers for these emission reductions—through a carbon offset market or directly with payments—could increase the number of livestock producers who would profit from adopting a methane digester. We developed an economic model that illustrates how dairy and hog operation size, location, and manure management methods, along with electricity and carbon prices, could influence methane digester profits. The model shows that a relatively moderate...
Tipo: Report
Palavras-chave: Methane; Methane digesters; Manure; Livestock; Climate change; Greenhouse gases; Carbon offset; Environmental Economics and Policy; Financial Economics; Livestock Production/Industries; Resource /Energy Economics and Policy.
Ano: 2011
URL: http://purl.umn.edu/102758

Carbon Emissions, Renewable Electricity and Profits:   Comparing Alternative Policies to Promote Anaerobic Digesters on Dairies
Provedor de dados: 31
Autores: Key,   Nigel D.; Sneeringer,   Stacy E.
Biogas recovery systems that use methane from manure to generate electricity have not been widely adopted in U.S. mainly because the costs of constructing and maintaining these systems have exceeded the value of the benefits provided.  Climate change mitigation and renewable energy policies could increase profits for the operators of such systems thereby making digester adoption more widespread.  For the U.S. Dairy sector, we examine digester adoption rates, emissions reductions, net returns, electricity generation, and program costs under different policy scenarios.  We find that 3% or fewer dairies would need to adopt digesters to meet the policy goals of reducing 25% of greenhouse gas emissions from dairy manure or generating one million megawatt hours...
Tipo: Conference Paper or Presentation
Palavras-chave: Anaerobic digester; Methane; Dairy; Renewable electricity; Subsidy; Carbon offsets; Climate change; Environmental Economics and Policy; Livestock Production/Industries; Q5.
Ano: 2011
URL: http://purl.umn.edu/103440

The Addition of Hatchery Liquid Waste to Dairy Manure Improves Anaerobic Digestion
Provedor de dados: 89
Autores: Lopes,WRT; Orrico,ACA; Garcia,RG; Orrico Jr,MAP; Manarelli,DM; Fava,AF; Nääs,IA.
ABSTRACT The objective of this study was to determine the optimal inclusion level of liquid egg hatchery waste for the anaerobic co-digestion of dairy cattle manure. A completely randomized experimental was applied, with seven treatments (liquid hatchery waste to cattle manure ratios of0: 100, 5:95, 10:90, 15:85, 20:80, 25:75 and 30:70), with five replicates (batch digester model) each. The evaluated variables were disappearance of total solids (TS), volatile solids (VS), and neutral detergent fiber (NDF), and specific production of biogas and of methane. Maximum TS and VS disappearance of 41.3% and 49.6%, were obtained at 15.5% and 16.0% liquid hatchery waste inclusion levels. The addition of 22.3% liquid hatchery considerably reduced NDF substrate...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Poultry production; Biogas; Methane; Total solids; Volatile solids.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-635X2016000600065

Soil CH4 and N2O Emissions from Rice Paddy Fields in Southern Brazil as Affected by Crop Management Levels: a Three-Year Field Study
Provedor de dados: 90
Autores: Zschornack,Tiago; Rosa,Carla Machado da; Reis,Cecília Estima Sacramento dos; Pedroso,Gabriel Munhoz; Camargo,Estefânia Silva; Santos,Daiane Carvalho dos; Boeni,Madalena; Bayer,Cimélio.
ABSTRACT Rice yield increases in response to improvements in crop management, but the impact on greenhouse gas (GHG) emissions in the subtropical region of Southern Brazil remains unknown. A three-year field study was developed aiming to evaluate the impact that an increase in crop management levels (high and very high) has on soil methane (CH4) and nitrous oxide (N2O) emissions, as compared to the level (medium) currently adopted by farmers in Southern Brazil. Differences in crop management included seed and fertilizer rates, irrigation, and pesticide use. The effect of crop management levels on the annual partial global warming potential (pGWP = CH4 × 25 + N2O × 298) ranged from 7,547 to 17,711 kg CO2eq ha−1 and this effect was larger than on the rice...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Entisols; Flooded rice; Greenhouse gases; Methane; Yield-scaled.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832018000100516

CO2, CH4 and N2O fluxes in an Ultisol treated with sewage sludge and cultivated with castor bean
Provedor de dados: 90
Autores: Chiaradia,Jonas Jacob; Chiba,Marcio Koiti; Andrade,Cristiano Alberto de; Carmo,Janaína Braga do; Oliveira,Claudeir de; Lavorenti,Arquimedes.
Organic residue application into soil alter the emission of gases to atmosphere and CO2, CH4, N2O may contribute to increase the greenhouse effect. This experiment was carried out in a restoration area on a dystrophic Ultisol (PVAd) to quantify greenhouse gas (GHG) emissions from soil under castor bean cultivation, treated with sewage sludge (SS) or mineral fertilizer. The following treatments were tested: control without N; FertMin = mineral fertilizer; SS5 = 5 t ha-1 SS (37.5 kg ha-1 N); SS10 = 10 t ha-1 SS (75 kg ha-1 N); and SS20 = 20 t ha-1 SS (150 kg ha-1 N). The amount of sludge was based on the recommended rate of N for castor bean (75 kg ha-1), the N level of SS and the mineralization fraction of N from SS. Soil gas emission was measured for 21...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Residue; Nitrogen; Carbon dioxide; Nitrous oxide; Methane.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832009000600035

Methanization potential of anaerobic biodigestion of solid food waste
Provedor de dados: 91
Autores: Oliveira,Laís R. G. de; Santos Filho,Derovil A. dos; Vasconcelos,Kaline C.; Lucena,Talita V. de; Jucá,José F. T.; Santos,André F. de M. S.
ABSTRACT Anaerobic biodigestion of solid and semi-solid wastes has been widely used for the treatment of these residues and methane production; however, during the process (more specifically in the acidogenic phase), there is a tendency of pH reduction, an unfavorable condition to methanogenic bacteria. Thus, the present work aims to evaluate the methanization potential of an agroindustrial anaerobic granular sludge (AIS) from UASB (Upflow Anaerobic Sludge Blanket) reactor, individually and biodigested with food waste (FW) from the University Restaurant of the Federal University of Pernambuco with buffering agent (AIS + FW + b) and without it (AIS + FW). After the laboratory tests, the AIS + FW + b configuration obtained a cumulative methane production...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Biodegradation; Methane; PH; Inoculum.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662018000100069

Anaerobic co-digestion of hatchery waste and wastewater to produce energy and biofertilizer - Batch phase
Provedor de dados: 91
Autores: Matter,Juliana M.; Costa,Mônica S. S. de M.; Costa,Luiz A. de M.; Pereira,Dercio C.; Varennes,Amarílis de; Tessaro,Dinéia.
ABSTRACT Aiming to evaluate different wastewaters in the anaerobic co-digestion (ACoD) of hatchery wastes, a batch test was conducted in bench horizontal digesters. At the end of the process, the potential production of biogas and methane was calculated as well as the chemical composition (macro- and micronutrients) of the effluent and the concentrations of methane and carbon dioxide gas at 60 days. The monitoring of the process included observations of the reduction of the organic carbon, chemical oxygen demand, and total (TS) and volatile solids (VS), as well as the variation of pH and electrical conductivity (EC). The results showed that the mixing between the hatchery fresh waste and swine wastewater (T4) and among fresh hatchery waste, water from the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Biogas; Methane; Swine wastewater; Slaughterhouse wastewater.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662017000900651

Effect of calcium propionate and monensin on in vitro digestibility and gas production
Provedor de dados: 96
Autores: Osorio-Teran,Amada Isabel; Mendoza-Martínez,Germán David; Miranda-Romero,Luis Alberto; Martínez-Gomez,Daniel; Hernández-García,Pedro Abel; Martínez-García,José Antonio.
ABSTRACT An evaluation of the effects of monensin and calcium propionate on the in vitro kinetics of gas production, digestibility, carbon dioxide, and minor gas production on different days was performed using the ruminal fluid from eight Suffolk lamb donors, after receiving additives for 1, 10, and 20 days. Treatments consisted of a control ration of 40% grain; 30 mg/kg of monensin in a diet with 40% grain; 10 g/kg calcium propionate in a diet with 30% grain; and the combination of both additives in a diet with 30% grain. The gas production was measured up to 72 h of incubation and all incubation procedures were repeated three times on days 1, 10, and 20. On incubation day 20, the volume and production of methane and minor gases were measured. There was...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Additive feeding; Carbon dioxide; Ionophore; Methane; Rumen fermentation.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982017000400348

Effect of the dietary level of cull pinto beans (Phaseolus vulgaris) on ruminal fermentation, kinetics, and digestibility of hair lambs
Provedor de dados: 96
Autores: Castillo Rangel,Francisco; Villalobos Villalobos,Guillermo; Domínguez Díaz,David; Ortega Gutiérrez,Juan Ángel.
ABSTRACT The objective was to evaluate the effect of three levels of cull pinto beans (CPB; Phaseolus vulgaris) on ruminal fermentation, kinetics, and nutrient digestibility in hair lambs. Six cannulated lambs averaging 56.6±3.8 kg were used and were randomly assigned to one of three treatments. Treatments were: 0.0 kg kg−1 of CPB in the supplement (control); 0.25 kg kg−1 of CPB in the supplement (CB25); and 0.40 kg kg−1 of CPB in the supplement (CB40). Dry matter intake, ruminal pH, NH3, and volatile fatty acid (VFA) concentration, methane production, Kp (passage rate), MRT (mean retention time), and digestibility of dry matter, crude protein, and neutral detergent fiber were evaluated. Data were analyzed in a Latin square design, repeated in line, by...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Ammonia; Legumes; Methane; Ruminal pH; Sheep; Volatile fatty acids.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982017000500405

The role of condensed tannins in ruminant animal production: advances, limitations and future directions
Provedor de dados: 96
Autores: Naumann,Harley D.; Tedeschi,Luis O.; Zeller,Wayne E.; Huntley,Nichole F.
ABSTRACT Tannins represent one of the most abundant polyphenolic compounds in plants. Tannins exist as a multitude of chemically unique entities in nature. The most commonly occurring tannins are typically divided into two major classes based on chemical structure: hydrolysable (HT) or condensed tannins (CT). Hydrolysable tannins are esters of gallic or ellagic acid linked to a polyol core, typically glucose. Condensed tannins or proanthocyanidins consist of flavan-3-ol subunits linked together to form oligomers and polymers. Both HT and CT are defined as astringent, medium-to-high-molecular weight polyphenolic compounds that characteristically bind and precipitate soluble proteins. The objective of this paper was to present recent advances in CT-ruminant...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Anthelmintic; Bypass protein; Hydrolysable tannin; Methane; Polyphenol; Proanthocyanidin.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982017001200929

Anaerobic bio-digestion of concentrate obtained in the process of ultra filtration of effluents from tilapia processing unit
Provedor de dados: 96
Autores: Souza,Milena Alves de; Chaguri,Milena Penteado; Castelini,Fabrício Rogério; Lucas Junior,Jorge de; Vidotti,Rose Meire.
The objective of the present study was to evaluate the efficiency of the process of biodigestion of the protein concentrate resulting from the ultrafiltration of the effluent from a slaughterhouse freezer of Nile tilapia. Bench digesters were used with excrements and water (control) in comparison with a mixture of cattle manure and effluent from the stages of filleting and bleeding of tilapias. The effluent obtained in the continuous process (bleeding + filleting) was the one with highest accumulated population from the 37th day, as well as greatest daily production. Gases composition did not differ between the protein concentrates, but the gas obtained with the use of the effluent from the filleting stage presented highest methane gas average (78.05%) in...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Biogas; Bleeding; Filleting; Freshwater-fish; Methane.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982012000200002

Supplementation with corn oil and palm kernel oil to grazing cows: ruminal fermentation, milk yield, and fatty acid profile
Provedor de dados: 96
Autores: Girón,Jair Esteban Parales; Restrepo,Martha Lucía Pabón; Fornaguera,Juan Evangelista Carulla.
ABSTRACT The effect of supplementation with corn oil (CO) and its mixture with palm kernel oil (CO:PKO 75:25) to grazing cows on ruminal fermentation, milk yield, and its fatty acid (FA) profile was evaluated. The treatments were: one control treatment (C) without oil and two treatments with 720 g d−1/cow of CO or CO:PKO (ether extract: 22.7 g kg−1 for control treatment, 66 g kg−1 for CO, and 65 g kg−1 for CO:PKO). Six multiparous Holstein cows (6.3±1.8 yr, 597±11.5 kg body weight (BW), 160±29 d in milk; mean ± standard deviation) were assigned to a double 3 × 3 × 3 Latin square design. Cows grazed (3 kg DM/100 kg BW) a Cenchrus clandestinus (previously Pennisetum clandestinum) pasture and were supplemented with 0.9 kg d−1 DM corn silage, 4.2 kg d−1 DM...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Conjugated linoleic acid; Methane; Milk composition.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982016001100693

Protein metabolism, feed energy partitioning, behavior patterns and plasma cortisol in Nellore steers with high and low residual feed intake
Provedor de dados: 96
Autores: Gomes,Rodrigo da Costa; Sainz,Roberto Daniel; Leme,Paulo Roberto.
The objective was to evaluate protein turnover, nitrogen balance, feed energy partitioning, behavior patterns and plasma cortisol in Nellore (B. indicus) cattle with high and low residual feed intake (RFI = actual minus expected dry matter intake). Seventy-two Nellore steers (16 to 21 months-old, 334±19 kg initial body weight) were fed a feedlot diet for 70 days ad libitum. Daily dry matter intake (DMI) and average daily gain (ADG) were recorded individually and RFI was calculated. The 12 steers of lowest (Low-RFI, most efficient) RFI and the 12 ones of highest RFI (High-RFI, least efficient) were evaluated with respect to their behavior patterns and plasma cortisol concentration. Urine was collected for determination of daily 3-methylhistidine excretion...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Bos indicus; Feed efficiency; Methane; Net feed intake; 3-methyl-histidine; Zebu.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982013000100007

Impact of dietary manipulation on nutrient flows and greenhouse gas emissions in cattle
Provedor de dados: 96
Autores: Kebreab,Ermias; Strathe,Anders; Fadel,James; Moraes,Luis; France,James.
The growing global demand for meat and particularly in countries such as Brazil is expected to increase intensive animal production. Consequently the main pollutants of interest are nitrogen (N), phosphorus (P) and greenhouse gases (GHG). Nitrogen can be a problem through nitrate leaching to water bodies, ammonia, and nitrous oxide emissions to air. Phosphorus loading in soil from manure application can be the main issue due to the tendency of P to accumulate in soil and leach to groundwater and rivers. The sources of agricultural GHG emissions include methane from enteric fermentation, manure storage and spreading, and nitrous oxide mainly from application of manure on land. Dietary manipulation has proven to be an effective tool to reduce...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Methane; Nitrogen; Phosphorus; Pollution; Ruminants.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982010001300050

Additives on in vitro ruminal fermentation characteristics of rice straw
Provedor de dados: 96
Autores: Peripolli,Vanessa; Barcellos,Júlio Otávio Jardim; Prates,Ênio Rosa; McManus,Concepta; Stella,Laion Antunes; Camargo,Cláudia Medeiros; Costa Jr,João Batista Gonçalves; Bayer,Cimélio.
ABSTRACT The objective of this study was to evaluate the effects of mineral and protein-energy (MPES), exogenous fibrolytic enzyme supplements (ES), combination of MPES + ES, and straw without supplement (WS) on digestibility, fermentation kinetic parameters, cumulative gas production, methane, CO2 production, and volatile fatty acid concentration of rice straw of low and high nutritional value, estimated by in vitro techniques. The experimental design was randomized and factorial 2 × 4: two straws (low and high nutritional value) incubated with four supplements (MPES, ES, MPES + ES, and WS) and their interactions. Four experimental periods were used, totaling four replications per treatment over time. Data were analyzed by PROC MIXED of SAS. The in vitro...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Digestibility; Digestion kinetics; Fatty acid; Gas production; Methane.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982017000300240

Ex-ante greenhouse gas balance of agriculture and forestry development programs
Provedor de dados: 63
Autores: Bernoux,Martial; Branca,Giacomo; Carro,Aude; Lipper,Leslie; Smith,Garry; Bockel,Louis.
EX-ACT (EX-Ante Carbon-balance Tool) is a tool developed by the Food and Agriculture Organization of the United Nations (FAO). It provides ex-ante measurements of the mitigation impact of agriculture and forestry development projects, estimating net C balance from GHG emissions and Carbon (C) sequestration. EX-ACT is a land-based accounting system, measuring C stocks, stock changes per unit of land, and CH4 and N2O emissions expressed in t CO2-eq per hectare and year. The main output of the tool is an estimation of the C-balance associated with the adoption of improved land management options, as compared with a "business as usual" scenario. EX-ACT has been developed using primarily the IPCC 2006 Guidelines for National Greenhouse Gas Inventories,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Mitigation; Nitrous oxide; Methane; C sequestration; Land use change and forestry.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162010000100005

Yield-scaled global warming potential of two irrigation management systems in a highly productive rice system
Provedor de dados: 63
Autores: Tarlera,Silvana; Capurro,María Cristina; Irisarri,Pilar; Scavino,Ana Fernández; Cantou,Guillermina; Roel,Alvaro.
ABSTRACT Water management impacts both methane (CH4) and nitrous oxide (N2O) emissions from rice paddy fields. Although controlled irrigation is one of the most important tools for reducing CH4emission in rice production systems it can also increase N2O emissions and reduce crop yields. Over three years, CH4 and N2O emissions were measured in a rice field in Uruguay under two different irrigation management systems, using static closed chambers: conventional water management (continuous flooding after 30 days of emergence, CF30); and an alternative system (controlled deficit irrigation allowing for wetting and drying, AWDI). AWDI showed mean cumulative CH4 emission values of 98.4 kg CH4 ha−1, 55 % lower compared to CF30, while no differences in nitrous...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Greenhouse gases; Emissions; Methane; Nitrous oxide; Mitigation.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162016000100043

Biogas production: litter from broilers receiving direct-fed microbials and an enzyme blend
Provedor de dados: 63
Autores: Praes,Maria Fernanda Ferreira Menegucci; Lucas Junior,Jorge de; Orrico,Ana Carolina Amorim; Orrico Junior,Marco Antonio Previdelli; Hermes,Rafael Gustavo; Sorbara,José Otávio Berti; Duarte,Karina Ferreira; Schwingel,Alice Watte; Sgavioli,Sarah; Domingues,Carla Heloisa de Faria; Sunada,Natália da Silva.
ABSTRACT The effect of additives used in the feed of broilers on anaerobic bio-digestion of poultry litter was evaluated. Four diets were used: NC: negative control; DFM: NC + 500 ppm direct-fed microbials (DFM) containing Bacillus subtilis and Bacillus licheniformis; ENZ: diet formulated with an enzyme blend (20 ppm phytase, 200 ppm protease and 200 ppm xylanase); DFM+E: ENZ + DFM. Substrates for the anaerobic bio-digestion were prepared with litter from each treatment, containing 4 % total solids (TS). These were used in 16 continuous bio-digesters with a 2 kg d−1 load, to determine the production and potential biogas production and composition during an 85-day period. Influent and effluent samples were collected for the amounts of TS and volatile solids...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Additives; Bio-digestion; Bio-digester; Methane; Livestock residues.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162016000500406

Carbon sequestration and greenhouse gases emissions in soil under sewage sludge residual effects
Provedor de dados: 63
Autores: Pitombo,Leonardo Machado; Carmo,Janaina Braga do; Maria,Isabela Clerici de; Andrade,Cristiano Alberto de.
The large volume of sewage sludge (SS) generated with high carbon (C) and nutrient content suggests that its agricultural use may represent an important alternative to soil carbon sequestration and provides a potential substitute for synthetic fertilizers. However, emissions of CH4 and N2O could neutralize benefits with increases in soil C or saving fertilizer production because these gases have a Global Warming Potential (GWP) 25 and 298 times greater than CO2, respectively. Thus, this study aimed to determine C and N content as well as greenhouse gases (GHG) fluxes from soils historically amended with SS. Sewage sludge was applied between 2001 and 2007, and maize (Zea mays L.) was sowed in every year between 2001 and 2009. We evaluated three treatments:...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Biosolid; Nitrogen; Carbon dioxide; Methane; Nitrous oxide.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162015000200147

ความเป็นไปได้ของการใช้สารปรับปรุงดินเพื่อลดก๊าซเรือนกระจกและขณะเดียวกันรักษาผลผลิตข้าว: รายงานการวิจัยฉบับสมบูรณ์
Provedor de dados: 106
Autores: Patcharee Saenjan; Daungsamorn Tulapithak; Kasuyuki Inbuchi.
Field experiment was conducted in farmer’s rice field with loamy soil in Khon Kaen province, northeast of Thailand during to study the effect of different levels of sulfate (SO42-) on methane emission and rice yield.  SO42- was applied at the rate of 0, 50, 100, and 210 kg SO42- ha-1 by using ammonium phosphate (42% SO42-) with balanced amount of 80 kg N, 100 kg P2O5 and 80 kg K2O ha-1 by adding various fertilizers. The experiment was laid out in randomized completely block design (RCBD) with tripled replication. CH4 flux was measured every week by using closed chambers method. Global warming potential (GWP) was also calculated. Soil samples were collage at each growth stage to determine SO42-, NH4+ and Fe2+.  Rice yield was measured at harvest.  The...
Tipo: PhysicalObject
Palavras-chave: Rice; Paddy soil; Rice production; Rice yield; Sulfate; Global warming potential; GWP; Methane; Feasible soil; Greenhouse gas emission; ข้าว; ดินนา; การผลิตข้าว; ภาวะโลกร้อน; ก๊าซมีเทน; ก๊าซเรือนกระจก; การปลดปล่อยก๊าซมีเทน; สารปรับปรุงดิน; ปุ๋ยซัลเฟต; การลดปริมาณก๊าซมีเทน; จ.ขอนแก่น.
Ano: 2011
URL: http://anchan.lib.ku.ac.th/agnet/handle/001/5715

การเพิ่มผลผลิตข้าวหอมอินทรีย์และการปลดปล่อยก๊าซมีเทน ปีที่ 2: การใช้ถั่วเขียวเป็นปุ๋ยพืชสดโดยหว่านเมล็ดถั่วเขียวพร้อมเมล็ดข้าว
Provedor de dados: 106
Autores: Patcharee Saenjan; Duangsamorn Tulaphitak; Niwat Luangchaisri; Anan Polthanee.
Tipo: PhysicalObject
Palavras-chave: Rice; Methane; Fertilizer; Organic rice; Mungbean seed; Irrigation; ข้าวหอมอินทรีย์; ถั่วเขียว; ข้าวอินทรีย์; การเพิ่มผลผลิตข้าว; ก๊าซมีเทน; ปุ๋ยอินทรีย์; การจัดการน้ำ; นาข้าว; ระบบการปลูกพืช; ปุ๋ยพืชสด.
Ano: 2007
URL: http://anchan.lib.ku.ac.th/agnet/handle/001/5118

ผลของซัลเฟตและยูเรียต่อการผลิตก๊าซมีเทนในดินนาภายใต้สภาพการบ่มดินในห้องปฏิบัติการ
Provedor de dados: 106
Autores: Patcharee Senjaen; Sophoanrith Ro; Thepparit Tulaphitak.
Methane is one of important greenhouse gases emitted from submerged paddy soil under anaerobic condition. The objective of the present experiment was to study the influence of sulfate and urea on methane production in paddy soil. Four rates of sulfate (0, 50, 100 and 210 kg SO42- ha-1) were set up by using ammonium phosphate (16-20-0, 42 % sulfate) with the amount of N, P2O5 and K2O for each treatment being balanced by using urea, rock phosphate and potassium chloride. In addition, soil without urea application was prepared. All soils were incubated in bottles for 21 days in oxygen-free nitrogen ambient. Result showed that there is a linear relationship with negative correlation between methane production in soil and sulfate contents. The soil without urea...
Tipo: Collection
Palavras-chave: Methane; Paddy soil; Sulfate; Urea; Soil incubation; ก๊าซมีเทน; ดินนา; ซัลเฟต; ยูเรีย; การบ่มดิน; ปุ๋ยแอมโมเนียมฟอสเฟต.
Ano: 2011
URL: http://anchan.lib.ku.ac.th/agnet/handle/001/5283

Sulfate fertilizer influencing methane emissions in paddy field and rice (cv. Chainat 1) production
Provedor de dados: 106
Autores: Patcharee Saenjan; Natthakittiya Paiboon; Jamnong Tragoolram.
Methane (CH4) is one of the most important greenhouse gases having a significant impact upon global warming. Today, paddy fields are a major source of methane production. The objective of our experiment is to investigate whether sulfate fertilizer can reduce the amount of methane emissions from the paddy field into the atmosphere, while maintain or increase fertility of the paddy soil, and the rice production of Chainat1. The experimental plan was structured using the Randomized Complete Block Design (RCBD), consisting of four treatments: 1) Incorporation of rice stubble without the usage of sulfate fertilizer, 2) Incorporation of rice stubble using sulfate fertilizer, 18 kg SO4/rai, 3) Incorporation of rice stubble using sulfate fertilizer, 32 kg SO4/rai,...
Tipo: Collection
Palavras-chave: Rice; Paddy field; Ammonium phosphate; Methane; Chainat 1; ข้าว; ปุ๋ยซัลเฟต; การปลูกข้าว; นาข้าว; ก๊าซมีเธน; พันธุ์ชัยนาท 1.
Ano: 2012
URL: http://anchan.lib.ku.ac.th/agnet/handle/001/5335

การเพิ่มผลผลิตข้าวหอมอินทรีย์และการปลดปล่อยก๊าซมีเทน ปีที่ 1: การคัดเลือกเทคโนโลยีการจัดการน้ำและปุ๋ยอินทรีย์ต่อการเพิ่มผลผลิตข้าวอินทรีย์ที่ปล่อยก๊าซมีเทนต่ำในนาเกษตรกร
Provedor de dados: 106
Autores: Patcharee Saenjan; Niwat Luangchaisri; Anan Polthanee; Duangsamorn Tulaphitak.
Tipo: PhysicalObject
Palavras-chave: Organic rice; Methane; Irrigation; Fertilizer; Climate change; Attitudes; ข้าวอินทรีย์; การลดก๊าซมีเทน; การเพิ่มผลผลิตทางการเกษตร; วัสดุอินทรีย์; การไถกลบ; ดินนา่; นาข้าว; ทัศนคติ; เกษตรกร; ต้นทุนการผลิต; ผลตอบแทน; การเปลี่ยนแปลงสภาพภูมิอากาศ.
Ano: 2005
URL: http://anchan.lib.ku.ac.th/agnet/handle/001/5119

ภาวะโลกร้อนกับงานวิจัยในนาข้าว
Provedor de dados: 106
Autores: Patcharee Senjaen.
Tipo: Collection
Palavras-chave: Climate change; Methane; Greenhouse effect; Rice field; ภาวะโลกร้อน; ก๊าซมีเทน; ภาวะเรือนกระจก; นาข้าว; การเปลี่ยนแปลงภูมิอากาศ.
Ano: 2011
URL: http://anchan.lib.ku.ac.th/agnet/handle/001/5270

Correlation between chemical composition, kinetics of fermentation and methane production of eight pasture grasses
Provedor de dados: 2
Autores: Kulivand, Mahya; Kafilzadeh, Farokh.
Eight different grasses collected from pastures of the Kermanshah province (Kermanshah, Iran), at mid-vegetative stage were used to study the relationships between their chemical compositions, kinetic parameters of in vitro gas production and rumen methane production. There was a positive correlation (r = 0.62, p &lt; 0.05) between crude protein (CP) content of grasses and total gas production (A) at 96h incubation. Negative correlations were also observed between acid detergent fiber (ADF) content and total gas production (r = -0.60, p &lt; 0.05). Amongst the nutrients, neutral detergent fiber (NDF) and ADF were positively correlated with methane concentration, (r = 0.75 and 0.77, p &lt; 0.01). The methane reduction potential (MRP) was negative for...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Gas production; Pasture grasses; Methane; In vitro.
Ano: 2015
URL: http://periodicos.uem.br/ojs/index.php/ActaSciAnimSci/article/view/24336

In vitro degradability and total gas production of biodiesel chain byproducts used as a replacement for cane sugar feed
Provedor de dados: 2
Autores: Moreira, Milenna Nunes; Silva, Aderbal Marcos de Azêvedo; Carneiro, Heloisa; Bezerra, Leilson Rocha; Morais, Raissa Kiara Oliveira de; Medeiros, Fabiola Franklin de.
This study aimed to determine the in vitro degradability of dry matter and the total gas production of oil seed press cake from biodiesel production (Gossypium hirsutum L., Helianthus annuus L., Ricinus communis, Moringa oleífera L. and Pinhão manso curcas L.) at four different levels of replacement (0, 30, 50, and 70%) for cane sugar (Saccharum officinarum RB.) in ruminant feed. Inocula were prepared using the ruminal fluid of three Holstein cows, and data were collected after 48 hours of incubation. The byproducts of Moringa had the highest degradability, and castor presented the lowest values at all evaluated levels of replacement. Castor bean byproduct showed the highest total gas production, cotton showed the lowest production, and the byproduct of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Fermentation; Ruminant; Alternative foods; Methane.
Ano: 2014
URL: http://periodicos.uem.br/ojs/index.php/ActaSciAnimSci/article/view/23950

The role of small ruminants on global climate change
Provedor de dados: 2
Autores: Monteiro, Alda Lúcia Gomes; Faro, Amanda Moser Coelho da Fonseca; Peres, Mylena Taborda Piquera; Batista, Rafael; Poli, Cesar Henrique Espirito Candal; Villalba, Juan Jose.
 Global warming, as a consequence of excessive CO2 production mainly due to anthropogenic actions, is one of the main concerns of society due to the effects it can cause in the survival of humans, plants and animals. Several climatic consequences have already been reported, such as warming the oceans and changing biodiversity in various regions of the planet. One of the greenhouse gases responsible for global warming, which causes a lot of concern, is methane gas from digestion of food by ruminants. Besides that, emissions of greenhouse gases are represented also by waste management, rice cultivation, burning of residues from agriculture and soil management for agricultural production. Among ruminants, sheep and goats play an important economic role mainly...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Climate change; Goats; Methane; Sheep.
Ano: 2018
URL: http://periodicos.uem.br/ojs/index.php/ActaSciAnimSci/article/view/43124

Genetic diversity of 16S rRNA and mcrA genes from methanogenic archaeas
Provedor de dados: 3
Autores: Xavier, Keyla Vitoria Marques; Souza, Eden Silva e; Santos, Erick de Aquino; Diniz, Michely Correia.
Methanogenic archaeas are found in aquatic and terrestrial environments and are fundamental in the conversion of organic matter into methane, a gas that has a potential use as renewable source of energy, which is also considered as one of the main agents of the greenhouse effect. The vast majority of microbial genomes can be identified by a conservative molecular marker, the 16S ribosomal gene. However, the mcrA gene have been using in studies of methanogenic archaea diversity as an alternative marker, highly conserved and present only in methanogens. This gene allows the expression of the enzyme Methyl-coenzyme M reductase, the main agent in converting by-products of anaerobic digestion into methane. In this context, we aimed to study the genetic...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Heterozygosity; Microbiomes; Methane; Anaerobic; Arlerquin; Databases heterozygosity; Microbiomes; Methane; Anaerobic; Arlerquin; Databases.
Ano: 2020
URL: http://periodicos.uem.br/ojs/index.php/ActaSciBiolSci/article/view/49877

Evaluation of additive for reducing gaseous emissions from swine waste
Provedor de dados: 111
Autores: Sanjay B. Shah; NC State University; Praveen Kolar; Biological and Agricultural Engineering Department, North Carolina State University, Raleigh, NC 27695, USA.
Additives can reduce gaseous emissions from swine waste lagoons and pits.  We have demonstrated for the first time that an additive has the potential to reduce methane emission from an anaerobic swine lagoon.  ManureMax®, a humate product was evaluated for its ability to reduce gas and odor emissions from swine anaerobic lagoon and barn flush-water.  Four treatments, Control (no additive), Low (label dosage), Medium (50% higher than label dosage), and High (200% higher than label dosage) were applied to inclined pipes installed in a swine lagoon.  While the Medium and High treatments were not effective, the Low treatment reduced methane, 2-butanone, and tetrahydrofuran concentrations by 34%, 44%, and 57%, respectively vs. the Control in the pipe headspace....
Palavras-chave: Agricultural engineering; Environmental engineering; Air quality; Greenhouse gases; Animal waste Hog; Mesocosm-scale; Methane; 2-butanone; Tetrahydrofuran; Volatile fatty acids; Toluene.
Ano: 2012
URL: http://www.cigrjournal.org/index.php/Ejounral/article/view/2111

Emissions inventory of greenhouse gases and ammonia from livestock housing and manure management
Provedor de dados: 111
Autores: Mohamed Samer; Cairo University, Faculty of Agriculture, Department of Agricultural Engineering.
An emission inventory is a database on the amount of pollutants released into the atmosphere.  The anthropogenic emissions of air pollutants and greenhouse gases are detrimental to the environment and the ecosystems.  Therefore, reducing emissions is crucial. One key issue is to inventory these emissions, and consequently databases on anthropogenic emissions will be available for making decisions on implementing suitable mitigation strategies.  Such investigations aim at developing national emissions inventory for domestic livestock and to identify possible abatement techniques in order to reduce these emissions.  Therefore, the objectives of this study are to introduce and define the emissions inventories, review the emission inventory guides, introduce...
Palavras-chave: Agricultural engineering; Agricultural buildings and bioenvironmental engineering emissions inventory; Greenhouse gases; Methane; Nitrous oxide; Ammonia; Particulate matter; Livestock buildings; Manure; Emission factors; Emissions abatement techniques.
Ano: 2013
URL: http://www.cigrjournal.org/index.php/Ejounral/article/view/2449

Emissions inventory of greenhouse gases and ammonia from livestock housing and manure management
Provedor de dados: 111
Autores: Samer, Mohamed.
An emission inventory is a database on the amount of pollutants released into the atmosphere.  The anthropogenic emissions of air pollutants and greenhouse gases are detrimental to the environment and the ecosystems.  Therefore, reducing emissions is crucial. One key issue is to inventory these emissions, and consequently databases on anthropogenic emissions will be available for making decisions on implementing suitable mitigation strategies.  Such investigations aim at developing national emissions inventory for domestic livestock and to identify possible abatement techniques in order to reduce these emissions.  Therefore, the objectives of this study are to introduce and define the emissions inventories, review the emission inventory guides, introduce...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Agricultural engineering; Agricultural buildings and bioenvironmental engineering emissions inventory; Greenhouse gases; Methane; Nitrous oxide; Ammonia; Particulate matter; Livestock buildings; Manure; Emission factors; Emissions abatement techniques.
Ano: 2013
URL: http://www.cigrjournal.org/index.php/Ejounral/article/view/2449

Batch anaerobic digestion of banana waste - energy potential and modelling of methane production kinetics
Provedor de dados: 111
Autores: Khan, Muhammad Tahir; Brulé, Mathieu; Maurer, Claudia; Argyropoulos, Dimitrios; Müller, Joachim; Oechsner, Hans.
Different fractions of banana (stalk, peel, and flesh) as well as the whole unpeeled banana were studied in a laboratory Biochemical Methane Potential (BMP) assay. After completion of 35-day digestion at 37°C in 2L-reactors, specific methane yields reached 0.256, 0.322, 0.367 and 0.349 m³/kg VS (volatile solids) for stalk, peel, flesh, and unpeeled banana respectively. Considering the country of Uganda, East Africa, the collection of peels and stalks from banana production would yield a theoretical potential of about 60 GWh of electrical energy per year in biogas plants. In order to verify the suitability of banana fractions to the biogas process, their chemical composition was analyzed, and their methane production kinetics was estimated with exponential...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Energy biogas; Anaerobic digestion; BMP assay; Model; Energy; Methane; Waste.
Ano: 2016
URL: http://www.cigrjournal.org/index.php/Ejounral/article/view/3244

Feedstock and inoculum characteristics and process parameters as predictors for methane yield in mesophilic solid-state anaerobic digestion
Provedor de dados: 42
Autores: NIQUINI,GABRIELA R.; SILVA,SUZIMARA R.; COSTA JUNIOR,ESLY F.; COSTA,ANDRÉA O.S.
Abstract: In this study, several linear regression models were tested to predict the cumulative 30-day methane yield produced in mesophilic solid-state anaerobic digestion, employing diverse lignocellulosic biomass sources. Data collected from 13 studies were utilized, totalizing 86 experimental points, divided into regression and validation. Models containing higher order terms, the inverse of variables and interactions among all eleven input variables were tested. Simple linear models utilizing a single variable were unable to describe the methane production, giving an R² lower than 0.37. However, combinations of multiple variables and its inverses as only independent variable permitted an increase in simple linear models predictive capacity up to 63% of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Lignocellulosic biomass; Linear regression; Methane; Polynomial models; Solid-state anaerobic digestion.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652019000700865

Methanogenesis in an impacted and two dystrophic coastal lagoons (Macaé, Brazil)
Provedor de dados: 52
Autores: Furtado,André Luiz dos Santos; Casper,Peter; Esteves,Francisco de Assis.
This study investigated the methanogenic activity in sediment of the Imboacica (human impacted), Cabiúnas and Comprida coastal lagoons in Rio de Janeiro State (Brazil). Methane was not detected in water and sediment samples from the three lagoons. The measured nutrient concentrations in the pore-water indicated that methanogens activity was not limited by nutrients. Methanogenic activity was not detected under in vitro conditions, indicating that terminal organic carbon mineralisation via methanogenesis was negligible for the top 6 cm of sediment at the sampling time.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Coastal lagoon; Methane; Sediment; Nutrients.
Ano: 2002
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132002000200011

Methane concentration in water column and in pore water of a coastal lagoon (Cabiúnas lagoon, Macaé, RJ, Brazil)
Provedor de dados: 52
Autores: Fonseca,André Luiz dos Santos; Minello,Murilo; Marinho,Claudio Cardoso; Esteves,Francisco de Assis.
The aim of this study was to evaluate methane concentration in water column and pore water at limnetic and littoral regions of a coastal lagoon. At the littoral region samples were taken from three monospecific macrophytes stands (Typha domingensis, Eleocharis interstincta and Potamogeton stenostachys). The methane concentration in the pore water at the littoral region was higher than the concentration found at the limnetic region in each fraction of the sediment. The higher methane concentration in the superficial fraction of the sediment (0-2 cm) was shown at the P. stenostachys stand (3.7 mM). It was the only significantly different (p&lt;0.05) from the limnetic region. The pore water methane concentration increased with depth at the aquatic macrophytes...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Methane; Water column; Sediment; Aquatic macrophytes; Coastal lagoons.
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132004000200018

Floating Aquatic Macrophytes Decrease the Methane Concentration in the Water Column of a Tropical Coastal Lagoon: Implications for Methane Oxidation and Emission
Provedor de dados: 52
Autores: Fonseca,André Luiz dos Santos; Marinho,Claudio Cardoso; Esteves,Franscisco de Assis.
ABSTRACT In wetlands, the knowledge accumulated on the role of aquatic plants in the methane cycle focused on emergent macrophytes, to the detriment of other typologies. Herein, we evaluated whether the free-floating macrophyte Salvinia auriculata Aubl. and the floating-leaved macrophyte Eichhornia azurea (Sw.) Kunth. decrease the water column methane concentrations compared to a plant-free surface. We prepared microcosms by inserting an individual of S. auriculata or of E. azurea into chambers filled with lagoon water previously bubbled with CH4. Another set of chambers was incubated only with the prepared water, representing the plant-free surface. Half of the chambers were kept in the dark and half in sunlight to simulate a diel cycle. We observed...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Methane; Eutrophication; Global warming; Eichhornia azurea; Salvinia auriculata.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132017000100702

Effects of Yucca schidigera on gas mitigation in livestock production: A review
Provedor de dados: 52
Autores: Sun,Deng-Sheng; Jin,Xiao; Shi,Binlin; Xu,Yuanqing; Yan,Sumei.
ABSTRACT Yucca schidigera extract (YSE) has received much interest in the application of manure deodorization and hazardous gas mitigation in livestock rearing conditions. The main objective of this review article was to summarize the current knowledge regarding YSE towards its gas mitigation from livestock excrement. Saponins have been considered to be vital components of YSE in odor control and gas reduction in intensive farming industry due to their potentials in lowering methane for ruminants and ammonia for monogastric animals. This review article mainly covered the studies in ruminants, especially focused on in vitro environment. It also summarized possible reasons of the conflicting results among studies from the perspective of experimental design...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Yucca schidigera; Livestock; Ammonia; Methane; Ruminal fermentation.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132017000100701

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

Biomethane production from vinasse in upflow anaerobic sludge blanket reactors inoculated with granular sludge
Provedor de dados: 58
Autores: Barros,Valciney Gomes de; Duda,Rose Maria; Oliveira,Roberto Alves de.
ABSTRACT The main objective of this study was to evaluate the anaerobic conversion of vinasse into biomethane with gradual increase in organic loading rate (OLR) in two upflow anaerobic sludge blanket (UASB) reactors, R1 and R2, with volumes of 40.5 and 21.5 L in the mesophilic temperature range. The UASB reactors were operated for 230 days with a hydraulic detection time (HDT) of 2.8 d (R1) and 2.8-1.8 d (R2). The OLR values applied in the reactors were 0.2-7.5 g totalCOD (L d)−1 in R1 and 0.2-11.5 g totalCOD (L d)−1 in R2. The average total chemical oxygen demand (totalCOD) removal efficiencies ranged from 49% to 82% and the average conversion efficiencies of the removed totalCOD into methane were 48-58% in R1 and 39-65% in R2. The effluent recirculation...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Biogas; Mesophilic anaerobic treatment; Methane; Organic loading rate; Startup.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822016000300628

Analysis of methane biodegradation by Methylosinus trichosporium OB3b
Provedor de dados: 58
Autores: Rodrigues,Andréa dos Santos; Valdman,Belkis; Salgado,Andréa Medeiros.
The microbial oxidation of methane in the atmosphere is performed by methanotrophic bacteria that use methane as a unique source of carbon and energy. The objective of this work consisted of the investigation of the best conditions of methane biodegradation by methanotrophic bacteria Methylosinus trichosporium OB3b that oxidize it to carbon dioxide, and the use of these microorganisms in monitoring methods for methane. The results showed that M. trichosporium OB3b was capable to degrade methane in a more effective way with an initial microorganism concentration of 0.0700 g.L-1, temperature of 30ºC, pH 6.5 and using 1.79 mmol of methane. In these same conditions, there was no bacterial growth when 2.69 mmol of methane was used. The specific rate of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Methane; Biodegradation; Methanotrophic bacteria; Methylosinus trichosporium OB3b.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822009000200017

Influence of Waiting Time after Insertion of Base Chamber into Soil on Produced Greenhouse Gas Fluxes
Provedor de dados: 117
Autores: Muñoz,Cristina; Saggar,Surinder; Berben,Peter; Giltrap,Donna; Jha,Neha.
The soil chamber technique is most commonly used for measuring gas exchange between soil surfaces and the atmosphere, to understand regulatory processes relevant to determine the greenhouse gas (GHG) emissions from soils and to improve the emissions inventory of agricultural systems. The chambers are inserted into the soil to avoid the lateral diffusion of the gases. However, soil disturbance caused by chamber insertion causes in degassing and can result in erroneous flux data from measurements made immediately following chamber insertion. Here we assess the effect of soil disturbance associated with the insertion of the chambers on nitrous oxide (N2O) and methane (CH4) fluxes with and without N fertilization, from a New Zealand pasture soil. We collected...
Tipo: Journal article
Palavras-chave: Nitrous oxide; Methane; Agricultural soil; Soil biological processes; Gases monitoring.
Ano: 2011
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-58392011000400017

Methane emission from a flooded rice field under pre-germinated system
Provedor de dados: 65
Autores: Lima,Magda Aparecida de; Vieira,Rosana Faria; Frighetto,Rosa Toyoko Shiraishi; Luiz,Alfredo José Barreto; Villela,Omar Vieira.
ABSTRACT:  Local greenhouse gas flow measurement studies have been encouraged at a global level as a subsidy for national and state inventories. This study aimed to evaluate the seasonal methane emission during the 2008/2009 harvest, from an irrigated rice plantation, under pre-germinated system, in the municipality of Tremembé, State of São Paulo, using the static chamber technique and gas chromatography. The study showed high seasonal emission of methane (CH4) for the studied area, probably due to the long flooding period. It was estimated the CH4 emission factor (6.51 kg CH4 ha-1 dia-1), the partial global warming potential (pGWP, 27.2 Mg CO2eq growing season-1 ha-1) and the yield-scaled pGWP (YpGWP, 3.9 kg CO2eq kg-1 grain).
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Flooded rice; Pre-germinated system; Methane.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782019001100201

Pithecellobium dulce, Tagetes erecta and Cosmos bipinnatus on reducing enteric methane emission by dairy cows
Provedor de dados: 65
Autores: Pineda,Gloria Stefanny Hernández; Beltrán,Paulina Elizabeth Pedraza; Benaouda,Mohammed; García,José Manuel Palma; Nova,Francisca Avilés; Molina,Luisa; Ortega,Octavio Alonso Castelán.
ABSTRACT: The aim of the present research was to evaluate the effect of Pithecellobium dulce, Tagetes erecta and Cosmos bipinnatus on methane emission, milk yield and dry matter intake in dairy cattle. A 4×4 Latin square experimental design was employed, using four multiparous Holstein cows of 553±72.4kg body weight, at mid lactation and average milk yield of 17.3±3kg/day. The experiment lasted 92 days, divided into four experimental periods of 23 days each. All cows had free access to maize and alfalfa silage in a 50:50 proportion, 4kg of concentrate/day and ad libitum access to water. Treatments consisted in supplementation of 0.5kg/day of the experimental plants, with one control treatment without supplementation. Each cow received one of each treatment...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Methane; Cattle; Climate change; Mitigation; Tannins.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782018001000650

In vitro fermentation of corn silage using rumen fluid buffered or not and different sample amounts
Provedor de dados: 65
Autores: Homem Junior,Antonio Carlos; Ezequiel,Jane Maria Bertocco; Perez,Henrique Leal; Almeida,Marco Tulio Costa; Paschoaloto,Josimari Regina; Carvalho,Vanessa Barbosa de; Cremasco,Leonardo Fernandes; Costa,Macella Borsonello da.
Methodological variations in the amount of sample incubated and the type of rumen fluid used are commonly observed. This study evaluated the effect of three sample amounts (0.6, 1.3 or 2.6g DM 100mL-1 of rumen fluid) incubated in rumen fluid buffered (BRF-buffered rumen fluid) or not (PRF-pure rumen fluid) on total gas volume (TV), methane (CH4) production, dry matter degradation (DM Deg) and final pH of corn silage incubated in vitro. The highest DM Deg was reached with the lowest amounts of sample (0.6 and 1.3g of DM 100mL-1 of rumen fluid). The sample amount of 2.6g associated with PRF reduced CH4 production (P&lt;0.05), compared with the amounts of 0.6 and 1.3g DM 100mL-1, which had similar CH4 production (P&gt;0.05). The use of BRF caused no effect on...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Degradation; Gas; Incubation; Methane; PH.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782015001202229