Consulta: subjectFacets:"DMS"
Registros recuperados: 8
Data/hora: 09/06/2024 14:48:53

Modelling of the biofiltration of reduced sulphur compounds through biotrickling filters connected in series: Effect of H2S
Provedor de dados: 69
Autores: Silva,Javier; Morales,Marjorie; Cáceres,Manuel; Morales,Paulina; Aroca,Germán.
Background: The behaviour of two biotrickling filters connected in serie (BTF) inoculated with Acidithiobacillus thiooxidans and Thiobacillus thioparus, biodegrading hydrogen sulphide (H2S) and dimethyl sulphide (DMS) simultaneously were studied. A model which considers gas to liquid mass transfer and biooxidation in the biofilm attached to the support is developed. Additionally, a fixed bed biotrickling filter where the microorganism is immobilized in a biofilm which degrades a mixture of H2S and DMS is implemented. Validation of the model was carried out using experimental data obtained at different H2S and DMS loads. Results: The inhibitory effect caused by the presence of H2S on the DMS is observed, which is evidenced by the decrease of the DMS removal...
Tipo: Journal article
Palavras-chave: Biofiltration; DMS; Hydrogen sulphide; Mathematical model; Thiobacillus thioparus.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582012000300007

Improvements to estimating the air-sea gas transfer velocity by using dual-frequency, altimeter backscatter
Provedor de dados: 5
Autores: Goddijn-murphy, Lonneke; Woolf, David; Chapron, Bertrand; Queffeulou, Pierre.
Air-sea gas exchange is affected by sea surface roughness and a previous study shows a significant relation between Ku-band backscattering from satellite altimeters and field estimates of gas transfer velocity, K. Recently C-band backscatter data were made available for altimeters on board the JASON-1 and JASON-2 satellites. In this paper we used experimental data from the same cruises to show that using the difference between the Ku-band and C-band signals to estimate sea surface roughness, and thus reducing the contribution from longer waves, improved the K estimates. This is consistent with the theory that gas transfer is largely controlled by short capillary-gravity waves. For satellite data closer than 2 hr and 0.5 degrees from the K sample stations,...
Tipo: Text
Palavras-chave: Air-sea gas transfer; Satellite altimetry; DMS.
Ano: 2013
URL: https://archimer.ifremer.fr/doc/00174/28564/26980.pdf

Dimethylsulfoniopropionate (DMSP) and dimethylsulfide (DMS) sea surface distributions simulated from a global three-dimensional ocean carbon cycle model
Provedor de dados: 5
Autores: Aumont, Olivier; Belviso, Sauveur; Monfray, Patrick.
[1] A global model for surface dimethylsulfide (DMS) and particulate dimethylsulfoniopropionate (DMSP) (pDMS) distributions is presented. The main goals of this work were to be able to predict the regional distribution of the air-sea fluxes of DMS and to predict eventually their future evolution with climate change. Diagnostic relationships have been established from data sets obtained during the ALBATROSS and EUMELI cruises carried out in the Atlantic Ocean. These equations nonlinearly relate DMS and pDMSP concentrations to chlorophyll concentrations and to the trophic status of surface waters. This model has been embedded in the global ocean carbon cycle model Institut Pierre et Simon Laplace-Ocean Carbon Cycle Model version 2 (ISPL-OCCM2), a simple...
Tipo: Text
Palavras-chave: Ocean; Biogeochemistry; Ecosystem modeling; DMS; Global.
Ano: 2002
URL: https://archimer.ifremer.fr/doc/00223/33448/31824.pdf

Downward flux of particulate dimethylsulphoniopropionate (dmspp) in the tropical open-ocean
Provedor de dados: 5
Autores: Corn, M; Belviso, S; Nival, P; Vigot, A; Buatmenard, P.
We report results from free-drifting sediment trap deployments at 200 m depth which enable measurement of the diel variations in the downward flux of detrital particulate dimethylsulphoniopropionate (DMSPp) over periods of 24-72 hours in three contrasting trophic regimes of the tropical northeastern Atlantic Ocean off Mauritania. The source of DMSPp was the phytoplankton living in surficial water layers. The three regimes exhibited similar strong diel cycles, the nocturnal fluxes being up to 100-fold lower than the daytime fluxes. High (or low) detrital DMSPp, fluxes were associated with high (or low) numbers of pteropods trapped inside the sampling cups. Thus, contamination of sinking material is likely to have occurred, promoting an overestimate of the...
Tipo: Text
Palavras-chave: SULFUR; DMS; DMSP; ZOOPLANKTON; SEDIMENTATION.
Ano: 1994
URL: http://archimer.ifremer.fr/doc/00098/20886/18500.pdf

Distribution et role des composes soufres reduits volatils sur la speciation metallique
Provedor de dados: 5
Autores: Cozic, Amandine.
A sensitive, precise and rapid analytical method was elaborated to measure simultaneously 5 volatile reduced sulfur compounds (VRSC) ; hydrogen sulfide (H2S), carbonyl sulfide (OCS), methane thiol (MeSH), dimethyl sulfide (DMS), dimethyl disulfide (DMDS). The study of VRSC in the Bay of Quiberon highlights seasonal and interannual variations of concentrations in epibenthic zone. H2S analyzed near the sediment water interface (anoxic microzones), is more elevated in summer. The OCS distribution is consistent with a predominant photodegradation in winter and a sedimentary source in summer. The variations of MeSH, DMS and DMDS are correlated with the Dinophyceae abundance. In the Seine estuary, the absence of volatile H2S in the up estuary is explained by the...
Tipo: Text
Palavras-chave: Phytoplankton; Metal speciation; DMS; Sulfur; Phytoplancton; Spéciation métallique; DMS; Soufre.
Ano: 2007
URL: http://archimer.ifremer.fr/doc/2007/these-2687.pdf

Sedimentation pathways in the Indian sector of the Southern Ocean during a production regime dominated by regeneration
Provedor de dados: 5
Autores: Cailliau, C; Belviso, S; Goutx, M; Bedo, A; Park, Y; Charriaud, E.
During summer 1994, the production regime at 2 sites located in the Indian sector of the Southern Ocean, one in the Permanent Open Ocean Zone (POOZ) at 52 degrees S, and a second in the Seasonal Ice Zone (SIZ) at 63 degrees S, was dominated by regeneration (0.3 &lt; f-ratio &lt; 0.4). Two time series, each of about 4 d, were performed over pre-determined time intervals of 4 h using a free-floating sediment trap set at 200 m at the 2 sites. Hourly variations of C, N, chlorophyll a (chl a) and its degradation products, taxon-specific pigments, lipid classes and dimethylsulfoniopropionate (DMSP) were measured simultaneously. Measurements in the water column were done during the sediment trap drifting. Fucoxanthin, a typical diatom pigment, was the major...
Tipo: Text
Palavras-chave: Antarctic; Austral ocean; Sediment traps; Diel cycles; Phytoplankton; Pigments; Lipids; DMSP; DMS.
Ano: 1999
URL: https://archimer.ifremer.fr/doc/00240/35083/33651.pdf

Comparação de substratos com diferentes quantidades de carboidratos solúveis utilizando a técnica in vitro semi-automática de produção de gases
Provedor de dados: 45
Autores: Nogueira,U.T.; Maurício,R.M.; Gonçalves,L.C.
Estudou-se a diferença entre a produção de gases (PG) e a degradação da matéria seca (DMS) para substratos com diferentes quantidades de carboidratos solúveis avaliados pela técnica in vitro de produção de gases. Foram utilizados cinco substratos (cana-de-açúcar, silagem de milho, capim-colonião, milho em grão e ração comercial para vacas em lactação) antes e após a retirada parcial dos carboidratos solúveis (lavados). A PG foi maior e a DMS menor para o material lavado. A concentração de carboidratos solúveis influenciou os resultados obtidos pela técnica de produção de gases.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: In vitro; Carboidratos solúveis; Gases; Fibra; DMS.
Ano: 2006
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-09352006000400027

Predição da degradação da matéria seca pelo volume de gases utilizando a técnica in vitro semi-automática de produção de gases
Provedor de dados: 45
Autores: Nogueira,Ú.T.; Maurício,R.M.; Gonçalves,L.C.; Pereira,L.G.R.
Estimou-se a degradação da matéria seca (DMS) via produção de gases (PG) por meio de equações. Foram agrupados dados de volume de gases e DMS de oito forrageiras (Brachiaria brizantha, Brachiaria decumbens, feno de Cynodon spp, silagem de milho, silagem de milheto, sorgo de corte, capim-elefante e cana-de-açúcar) e de milho em grão. Os dados de DMS obtidos em laboratório foram comparados à DMS obtida pelas equações de regressão. Apesar dos altos coeficientes de determinação, os resultados demonstraram a impossibilidade de estimar a DMS via PG pelas equações geral, de dois e de três pontos.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: In vitro; Predição; Gases; Fibra; DMS.
Ano: 2006
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-09352006000500028