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Deep-sea nematode assemblage has not recovered 26 years after experimental mining of polymetallic nodules (Clarion-Clipperton Fracture Zone, Tropical Eastern Pacific) ArchiMer
Miljutin, Dmitry M.; Miljutina, Maria A.; Arbizu, Pedro Martinez; Galeron, Joelle.
We investigated nematode assemblages inhabiting the 26-year-old track created by experimental deep-sea mining of polymetallic nodules, and two adjacent, undisturbed sites, one with nodules and one without nodules. The aim was to compare density, assemblage structure, and diversity indices in order to assess the process of recovery of the nematode assemblage inhabiting the disturbed site. This experimental dredging was conducted in 1978 by the Ocean Minerals Company (USA) in the area of a French mining claim in the Clarion-Clipperton Fracture Zone (Tropical Eastern Pacific) at a depth of about 5000 m. The nematode assemblage had not returned its initial state 26 years after the experimental dredging: the total nematode density and biomass within the...
Tipo: Text Palavras-chave: Body volume; Deep-sea; Density; Disturbance; Diversity; Dredging; Mining; Nematode; Nodule; Recolonization; Recovery.
Ano: 2011 URL: http://archimer.ifremer.fr/doc/00047/15867/13321.pdf
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Growth, photosynthesis, nodule nitrogen and carbon fixation in the chickpea cultivars under salt stress Braz. J. Plant Physiol.
Garg,Neera; Singla,Ranju.
Four cultivars of chickpea, two of them of Mediterranean origin (kabuli), CSG 9651, BG 267 and two Indian (desi) types, CSG 8962, DCP 92-3, differing in their salt sensitivities were identified after screening ten genotypes in saline soils. The cultivars CSG 9651 and CSG 8962 were salt tolerant while BG 267 and DCP 92-3 were salt sensitive, respectively. The seeds of different cultivars were inoculated with Mesorhizobium ciceri, strain F: 75 and the plants were grown in the greenhouse. After the establishment of symbiosis, 15-day-old seedlings were administered doses of saline at varying concentrations (0, 4, 6, 8 dSm-1 NaCl, Na2SO4, CaCl2). Plants were harvested at 40, 70 and 100 days after sowing, for analyses. The main aim was to compare the relative...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Chlorophyll pigments; Nitrogenase activity; Nodule; PEPCase; Rubisco.
Ano: 2004 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1677-04202004000300003
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Interacción simbiótica Rhizobium-leguminosas arbóreas en sistemas contaminados con hidrocarburos policíclicos aromáticos. Colegio de Postgraduados
López Ortiz, Carlos.
En este estudio se evaluó el establecimiento de la simbiosis entre Rhizobium tropici CIAT899 y las leguminosas arbóreas Leucaena leucocephala (Lam.) y Acaciella angustissima (Mill.) en sistemas contaminados con naftaleno (NAF) y fenantreno (FEN), y contempló dos fases experimentales. En la primera fase se evaluó el efecto de NAF y FEN en la dinámica de formación de nódulos, así como la respuesta de la planta en el contenido de compuestos fenólicos totales, actividad antioxidante total y contenido total de clorofilas y carotenos. En la segunda fase se evaluó la degradación de 60 mg FEN kg-1 de arena, así como la actividad de la enzima nitrogenasa en las rizosfera de las plantas. La contaminación con NAF y/o FEN tuvo efectos tóxicos para la formación de...
Palavras-chave: Nódulo; HPA's; Compuestos fenólicos; Contaminación; Nodule; Phenolic compounds; Contamination; Maestría; Edafología.
Ano: 2011 URL: http://hdl.handle.net/10521/379
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Les nodules du pacifique central dans leur environnement géologique CAMPAGNES COPANO - 1979 ArchiMer
Pautot, Guy; Hoffert, Michel.
The cruises named COPANO have been undertaken during the summer 1979 on the R. V. Le Suroit of the CNEXO, as a part of an international research program I.C.I.M.E. The objective of this project was to study relatively small zones (a few km2) and to establish a relationship between characteristics of the manganese nodules and their environment. During the COPANO cruises, five zones have been studied: two in the northern Pacific, two in the southern Pacific and finally one in the equatorial Pacific. All the zones are centered on the longitude 134° Wand therefore their symmetry to the highly productive equatorial zone may be tested. As one of the results of the cruises is the relation between nodules and the bottom soil, established by sediment-sampling and a...
Tipo: Text Palavras-chave: Géochimie; Cartographie; Geologie; Fonds marin; Environnement; Nodules; Geochemistry; Mapping; Structural geology; Environmental impact; Nodule.
Ano: 1984 URL: http://archimer.ifremer.fr/doc/1984/rapport-1144.pdf
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