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Registros recuperados: 13
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Agriculture biologique et qualité de l'eau : une évaluation des effets de la reconception de systèmes de polyculture élevage Inra
Barataud, F.; Foissy, D.; Burel, E.; Beaudoin, N.; Garnier, J.; Billen, G..
Tipo: Conference Paper Palavras-chave:  .
Ano: 2011 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD2011d3bfcbb9&uri=/notices/prodinra1/2011/04/
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Agronomical and environmental performances of organic farming in the Seine watershed, France Organic Eprints
Anglade, J.; Billen, G.; Garnier, J..
This work suggests that Soil Surface Balance is a robust indicator to compare the performances of organic agriculture with those of conventional agriculture, even strictly following the rules of rational and optimised application of fertilisers. The results of long term nitrogen budget calculation brought us to seriously reconsider the relevance of the need to increase crop yields, and more broadly to reconsider cropping patterns and production systems. In terms of policy levers for mitigating nitrogen contamination of water resources, only the shift to organic farming provides a possible way to reconcile agricultural production and water quality. Further, this view points out the need for specific measures to encourage more mixed farming approach to...
Tipo: Conference paper, poster, etc. Palavras-chave: Air and water emissions; Farm nutrient management.
Ano: 2013 URL: http://orgprints.org/24519/1/24519.pdf
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Caracteristiques saisonnieres de l'hydrobiologie du complexe estuariende Marennes-Oleron (France). ArchiMer
Heral, Maurice; Razet, Daniel; Deslous-paoli, Jean-marc; Berthome, Jean-paul; Garnier, J..
Four seasonal compaigns providing a sampling of 15 stations each followed during half a tide cycle, i.e. 120 water samples permit the definition of the main hydrobiological features of Marennes-Oleron Bay: salinity and turbidity, phytoplanktonic biomasses, ATP concentrations. The authors suggest that a new way of adapted sampling to their objectives, will work out in the future by sampling during tidal cycles but as frequently as possible.
Tipo: Text Palavras-chave: Seasonal variations; Salinity; ATP; Estuaries; Turbidity; Hydrobiology; Salinity; Phytoplankton; Estuaries; Biomass; Hydrobiology; Physicochemical properties; Phytoplankton; Environmental conditions; Biomass.
Ano: 1982 URL: http://archimer.ifremer.fr/doc/1982/publication-1854.pdf
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Interaction of salmon gonadotropin subunits : spectroscopic studies Animal Physiology
Salesse, R.; Garnier, J.; Breton, B..
Pituitary gonadotropins of female and male pacific salmon Oncorhynchus tshawytscha were prepared separately. The two preparations exhibited different sedimentation coefficients (2.8 and 2.3, respectively) but similar circular dichroism spectra indicative of low alpha helix and high beta sheet contents. Both hormones gave a difference spectrum (1 750 M-1 cm-1 at 287 nm) characteristic of perturbed tyrosine and phenylalanine residues when dissociated at acid pH. These results suggest that fish and mammal gonadotropins exhibit the same general folding of their polypeptide chains and undergo the same conformational transition when their subunits associate ; however, fish gonadotropin subunits reassociate at considerably faster rates. [A partir d'hypophyses du...
Tipo: Journal (Paginated) Palavras-chave: QP Physiology.
Ano: 1978 URL: http://phy043.tours.inra.fr:8080/archive/00000261/
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Nickel distribution and isotopic fractionation in a Brazilian lateritic regolith: coupling Ni isotopes and Ni K-edge XANES. ArchiMer
Ratie, G.; Garnier, J.; Calmels, D.; Vantelon, D.; Guimaraes, E.; Monvoisin, G.; Nouet, J.; Ponzevera, Emmanuel; Quantin, C..
Ultramafic (UM) rocks are known to be nickel (Ni) rich and to weather quickly, which makes them a good candidate to look at the Ni isotope systematics during weathering processes at the Earth’s surface. The present study aims at identifying the Ni solid speciation and discussing the weathering processes that produce Ni isotope fractionation in two deep laterite profiles under tropical conditions (Barro Alto, Goiás State, Brazil). While phyllosilicates and to a lower extent goethite are the main Ni-bearing phases in the saprolitic part of the profile, iron (Fe) oxides dominate the Ni budget in the lateritic unit. Nickel isotopic composition (δ60Ni values) has been measured in each unit of the regolith, i.e., rock, saprock, saprolite and laterite (n=52)....
Tipo: Text Palavras-chave: Nickel cycle; Lateritic regolith; Nickel isotopes; XANES; Ultramafic environment; Weathering.
Ano: 2018 URL: https://archimer.ifremer.fr/doc/00436/54712/56149.pdf
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Nickel isotope fractionation during laterite Ni ore smelting and refining: implications for tracing the sources of Ni in smelter-affected soils ArchiMer
Ratie, G.; Quantin, C.; Jouvin, D.; Calmels, D.; Ettler, V.; Sivry, Y.; Cruz Vieira, L.; Ponzevera, Emmanuel; Garnier, J..
Nickel isotope ratios were measured in ores, fly ash, slags and FeNi samples from two metallurgical plants located in the Goiás State, Brazil (Barro Alto, Niquelândia). This allowed investigating the mass-dependent fractionation of Ni isotopes during the Ni-laterite ore smelting and refining. Feeding material exhibits a large range of δ60Ni values (from 0.02 ± 0.10 ‰ to 0.20 ± 0.05 ‰, n=7), explained by the diversity of Ni-bearing phases, and the average of δ60Nifeeding materials was found equal to 0.08 ± 0.08‰ (2SD, n=7). Both δ60Ni values of fly ash (δ60Ni = 0.07 ± 0.07‰, n=10) and final FeNi produced (0.05 ± 0.02 ‰, n=2) were not significantly different from the feeding materials ones. These values are consistent with the very high production yield of...
Tipo: Text Palavras-chave: Nickel; Isotope; Smelting; Refining; Source; Soil.
Ano: 2016 URL: http://archimer.ifremer.fr/doc/00278/38961/37501.pdf
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Nitrogen cycling in a hypothetical scenario of generalised organic agriculture in the Seine, Somme and Scheldt watersheds Inra
Thieu, V.; Billen, G.; Garnier, J.; Benoit, M..
Nitrogen contamination of ground and surface water in the Seine, Somme and Scheldt watersheds, as well as in the receiving coastal marine zones, results in severe ecological problems. Previous modelling results showed that the implementation of classical management measures involving improvement of wastewater purification and good agricultural practices are not sufficient to obviate these problems. A more radical scenario was therefore established, consisting of a generalised shift to organic agriculture of all agricultural areas in the three basins, with the additional constraints that livestock is fed only on local fodder production. This scenario involves an increased livestock density in the Seine and Somme and a decrease in livestock in the Scheldt...
Tipo: Journal Article Palavras-chave: SCHELDT  NITROGEN; ORGANIC AGRICULTURE; NITRATE CONTAMINATION; EUTROPHICATION.
Ano: 2010 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD2011d28249c5&uri=/notices/prodinra1/2011/04/
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Nitrogen leaching from organic agriculture and conventional crop rotations (France) Organic Eprints
Benoit, M.; Garnier, J.; Billen, G.; Mercier, B.; Azougui, A..
A great challenge to science is to elucidate how agriculture can feed the increasing world population without damaging the environment, while preserving other resources such as freshwater. In the Seine basin, characterised by intensive agriculture, most of surface and underground water is contaminated by nitrate. Conventional agriculture has regularly increased the use of industrial fertilisers since the WWII, leading to high nitrogen leaching, as shown by lysimeters or suction cup measurements. Such measurements are very scarce for other agricultural systems such as organic farming (Hansen et al. 2000; Haas et al. 2002; Mondelaers et al. 2009). The goal of our study is to investigate nitrogen leaching from organic agriculture, taking into account complete...
Tipo: Conference paper, poster, etc. Palavras-chave: Nutrient turnover; Air and water emissions.
Ano: 2013 URL: http://orgprints.org/24518/1/24518.pdf
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Phosphorus budget in the Marne watershed (France) : urban vs. diffuse sources, dissolved vs. particulate forms Inra
Némery, J.; Garnier, J.; Morel, C..
We evaluated the P sources (point, diffuse), through a nested watershed approach investigating the Blaise (607 km2), dominated by livestock farming, the Grand Morin (1202 km2), dominated by crop farming, and the Marne (12,762 km2), influenced by both agriculture and urbanization. Fertilizers account for the main P inputs (>60%) to the soils. An agricultural P surplus (0.5–8 kg P ha–1 year–1) contributes to P enrichment of the soil. The downstream urbanized zone is dominated by point sources (60%, mainly in dissolved forms), whereas in the upstream basin diffuse sources dominate (60%, mostly particulate). Among the diffuse sources (losses by forests, drainage and runoff), losses by runoff clearly dominate (>90%). P retention in the alluvial plain and...
Tipo: Journal Article Palavras-chave: SOURCE; RETENTION; ELEMENT CHIMIQUE; METALLOIDE; ECHANGE; EUTROPHISATION.
Ano: 2005 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD2007d013c4b6&uri=/notices/prodinra1/2010/11/
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Reducing marine eutrophication may require a paradigmatic change ArchiMer
Desmit, X.; Thieu, V.; Billen, G.; Campuzano, F.; Duliere, V.; Garnier, J.; Lassaletta, L.; Menesguen, Alain; Neves, R.; Pinto, L.; Silvestre, M.; Sobrinho, J. L.; Lacroix, G..
Marine eutrophication in the North-East Atlantic (NEA) strongly relies on nutrient enrichment at the river outlets, which is linked to human activities and land use in the watersheds. The question is whether human society can reduce its nutrient emissions by changing land use without compromising food security. A new version of Riverstrahler model (pyNuts-Riverstrahler) was designed to estimate the point and diffuse nutrient emissions (N, P, Si) to the rivers depending on land use in the watersheds across a large domain (Western Europe agro-food systems, waste water treatment). The loads from the river model have been used as inputs to three marine ecological models (PCOMS, ECO-MARS3D, MIRO&CO) covering together a large part of the NEA from the Iberian...
Tipo: Text Palavras-chave: North-East Atlantic; Eutrophication; Model scenarios; Land-sea continuum; Land use; Pristine; Management support.
Ano: 2018 URL: http://archimer.ifremer.fr/doc/00438/55007/56426.pdf
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ROC and confusion analysis of structure comparison methods identify the main causes of divergence from manual protein classification Inra
Sam, v; Tai, C.H.; Garnier, J.; Gibrat, J.F.; Lee, B.; Munson, P.J..
Current classification of protein folds are based, ultimately, on visual inspection of similarities. Previous attempts to use computerized structure comparison methods show only partial agreement with curated databases, but have failed to provide detailed statistical and structural analysis of the causes of these divergences.We construct a map of similarities/dissimilarities among manually defined protein folds, using a score cutoff value determined by means of the Receiver Operating Characteristics curve. It identifies folds which appear to overlap or to be "confused" with each other by two distinct similarity measures. It also identifies folds which appear inhomogeneous in that they contain apparently dissimilar domains, as measured by both similarity...
Tipo: Journal Article
Ano: 2006 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD2009e7c3acf8&uri=/notices/prodinra1/2009/08/
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The behavior of nickel isotopes at the biogeochemical interface between ultramafic soils and Ni accumulator species ArchiMer
Ratie, G.; Quantin, C.; Maia De Freitas, A.; Echevarria, G.; Ponzevera, Emmanuel; Garnier, J..
Ultramafic derived soils are characterized by low nutrient soils, a low Ca:Mg ratio, and high metal contents such as Ni, Co and Cr. The vegetation growing on these soils is highly adapted and includes both Ni hyperaccumulator and accumulator species. Today, approximately 530 Ni hyperaccumulator species are listed worldwide and the Ni concentration can be extremely high, e.g. up to 25% in latex from Pycnandra acuminata (Sapotaceae), a tree found in New Caledonia. The aim of this study is to identify the potential role of Ni hyperaccumulator plants in the Ni biogeochemical cycle at the soil surface by using Ni isotopes. A set of Ni hyperaccumulator and Ni accumulator plants as well as topsoils were sampled on the Barro Alto and Niquelândia ultramafic...
Tipo: Text Palavras-chave: Nickel; Isotope; Ni hyperaccumulator species; Ultramafic environment.
Ano: 2019 URL: https://archimer.ifremer.fr/doc/00464/57565/59740.pdf
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Towards an automatic classification of protein structural domains based on structural similarity Inra
Sam, V.; Tai, C.-H.; Garnier, J.; Gibrat, J.F.; Lee, B.; Munson, P. J..
Tipo: Journal Article Palavras-chave: STRUCTURE DES PROTEINES; CLASSIFICATION DES PROTEINES; CLUSTER PROTEIN STRUCTURAL.
Ano: 2008 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD2008a398eafc&uri=/notices/prodinra1/2009/10/
Registros recuperados: 13
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