المؤلفون: A. Djeddi, F. Parat, J.-L. Bodinier, K. Ouzegane, J.-M. Dautria

المساهمون: Laboratoire de Biologie du Développement (LBD), Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut de Biologie Paris Seine (IBPS), Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut National de la Santé et de la Recherche Médicale (INSERM)-Centre National de la Recherche Scientifique (CNRS)-Institut National de la Santé et de la Recherche Médicale (INSERM)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS), Géosciences Montpellier, Institut national des sciences de l'Univers (INSU - CNRS)-Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS)-Université des Antilles (UA), Université Mohammed VI Polytechnique [Ben Guerir] (UM6P), Faculté des Sciences de la Terre, de la Géographie et de l'Aménagement du Territoire (FSTGAT), Université des Sciences et de la Technologie Houari Boumediene = University of Sciences and Technology Houari Boumediene [Alger] (USTHB), Chauvet, Alain, Institut national des sciences de l'Univers (INSU - CNRS)-Université de Montpellier (UM)-Université des Antilles (UA)-Centre National de la Recherche Scientifique (CNRS), Mohammed VI Polytechnic University [Marocco] (UM6P), Université des Sciences et de la Technologie Houari Boumediene [Alger] (USTHB), Université des Antilles et de la Guyane (UAG)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS), Université Mohammed VI Polytechnique

المصدر: Frontiers in Earth Science
Frontiers in Earth Science, 2021, 8, ⟨10.3389/feart.2020.605116⟩
Frontiers in Earth Science, Frontiers Media, 2021, 8, ⟨10.3389/feart.2020.605116⟩
Frontiers in Earth Science, Vol 8 (2021)

مصطلحات موضوعية: Hoggar, 010504 meteorology & atmospheric sciences, Geochemistry, [SDU.STU.PE]Sciences of the Universe [physics]/Earth Sciences/Petrography, [SDU.STU]Sciences of the Universe [physics]/Earth Sciences, [SDU.STU.PE] Sciences of the Universe [physics]/Earth Sciences/Petrography, 010502 geochemistry & geophysics, 01 natural sciences, Apatite, [SDU] Sciences of the Universe [physics], chemistry.chemical_compound, [SDU.STU.GC]Sciences of the Universe [physics]/Earth Sciences/Geochemistry, hybrid mineral aggregates, Silicate minerals, lcsh:Science, Pegmatite, 0105 earth and related environmental sciences, Calcite, carbonatite, Silicate, alkaline magma, chemistry, [SDU]Sciences of the Universe [physics], visual_art, Carbonatite, visual_art.visual_art_medium, [SDU.STU] Sciences of the Universe [physics]/Earth Sciences, General Earth and Planetary Sciences, Carbonate, syenite, lcsh:Q, Igneous differentiation

الوصف: The 2 Ga-old Ihouhaouene alkaline complex (Western Hoggar, Algeria) is among the oldest known carbonatite occurrences on Earth. The carbonatites are calciocarbonatites hosted by syenites, the predominant rock type in the complex. Both rock types are characterized by medium-grained to pegmatitic textures and contain clinopyroxene, apatite, and wollastonite, associated with K-feldspar in syenites and a groundmass of calcite in carbonatites. The rock suite shows a continuous range of compositions from 57–65 wt.% SiO2 and 0.1–0.4 wt.% CO2 in red syenites to 52–58 wt.% SiO2 and 0.1–6.5 wt.% CO2 in white syenites, 20–35 wt.% SiO2 and 11–24 wt.% CO2 in Si-rich carbonatites (>10% silicate minerals), and 2 and 24–36 wt.% CO2 in Si-poor carbonatites (50), whereas clinopyroxene was precipitated from silicate liquids characterized by lower LREE/HREE (Ce/Lu = 49–234) and variable Nb/Ta ratios (Nb/Ta = 2–30). The Si-poor carbonatites resemble the Si-rich carbonatites and the white syenites with elevated REE contents in apatite equilibrium melts compared to clinopyroxene. However, apatite equilibrium melt in Si-poor carbonatite shows a majority of subchondritic values (Nb/Ta

وصف الملف: application/pdf

الوصول الحر: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::c0f6fc3557e6282d65bd878a717bfd6eTest
https://hal.science/hal-03393752Test

المؤلفون: Malam Issa, Oumarou, Défarge, Christian, Le Bissonnais, Yves, Marin, Béatrice, Duval, Odile, Bruand, Ary, d'Acqui, Luigi Paolo, Nordenberg, Sophie, Annerman, Marcus

المساهمون: Groupe d'Étude sur les Géomatériaux et Environnements Naturels, Anthropiques et Archéologiques - EA 3795 (GEGENAA), Université de Reims Champagne-Ardenne (URCA)-Institut national de recherches archéologiques préventives (Inrap)-Maison des Sciences Humaines de Champagne-Ardenne (MSH-URCA), Université de Reims Champagne-Ardenne (URCA)-Université de Reims Champagne-Ardenne (URCA), Institut des Sciences de la Terre d'Orléans (ISTO), Institut national des sciences de l'Univers (INSU - CNRS)-Université d'Orléans (UO)-Centre National de la Recherche Scientifique (CNRS), Laboratoire d'étude des Interactions Sol - Agrosystème - Hydrosystème (UMR LISAH), Institut de Recherche pour le Développement (IRD)-Institut National de la Recherche Agronomique (INRA)-Centre international d'études supérieures en sciences agronomiques (Montpellier SupAgro)-Institut national d’études supérieures agronomiques de Montpellier (Montpellier SupAgro), Unité de Science du Sol, Institut National de la Recherche Agronomique (INRA), Istituto per lo Studio degli Ecosistemi ISE-CNR, Istituto per lo Studio degli Ecosistemi, This work formed part of CYANOSOILS project funded by European Union, contract no. ICA4-CT-2001-10058

المصدر: ISSN: 0032-079X.

مصطلحات موضوعية: Cyanobacteria, Structural stability, Inoculation, Organo-mineral aggregates, Nostoc, Cryo-SEM, [SDU.ENVI]Sciences of the Universe [physics]/Continental interfaces, environment

الوصف: International audience ; Cyanobacteria are widespread photosynthetic microorganisms among which some are able to fix atmospheric nitrogen. We investigated the impact of indigenous cyanobacteria strains (Nostoc) inoculation on physical characteristics of poorly aggregated soils from Guquka (Eastern Cape, South Africa). The soil aggregates (3–5 mm) were arranged into a layer of 10–20 mm thick, and sprayed with cyanobacteria solution. Subsequently the inoculated and un-inoculated samples were incubated (30C, 80% humidity, continuous illumination at 100 lmol m–2 s–1). Their micromorphological characteristics and aggregate stability were investigated, after 1, 2, 3, 4 and 6 weeks of incubation, by using high resolution Cryo-SEM and aggregate breakdown tests.Micromorphological investigations revealed that the surface of uninoculated samples remained uncovered, while the inoculated samples were partially covered by cyanobacteria material after one week of incubation. Adense superficial network of cyanobacterial filaments and extracellular polymer secretions (EPS) covered their surface after 4 and 6 weeks of incubation. Organo-mineral aggregates comprising cyanobacterial filaments and EPS were observed after 6 weeks of incubation. The results of aggregate breakdown tests showed no significant difference between un-inoculated samples after 1, 2, 3, 4 or 6 weeks, while they revealed improvement of aggregate stability for inoculated samples. The improvement of aggregate stability appeared in a short while following inoculation and increased gradually with time and cyanobacteria growth. The increase in aggregate stability is likely related to the changes induced in micromorphological characteristics by cyanobacterial filaments and EPS. It reflects the effect of coating, enmeshment, binding and gluing of aggregates and isolated mineral particles by cyanobacteria material.

العلاقة: hal-00120328; https://insu.hal.science/hal-00120328Test; https://insu.hal.science/hal-00120328/documentTest; https://insu.hal.science/hal-00120328/file/Malam_Issa-Plant_and_soil-2007.pdfTest; PRODINRA: 19664; WOS: 000243624400017

الإتاحة: https://doi.org/10.1007/s11104-006-9153-9Test
https://insu.hal.science/hal-00120328Test
https://insu.hal.science/hal-00120328/documentTest
https://insu.hal.science/hal-00120328/file/Malam_Issa-Plant_and_soil-2007.pdfTest

المؤلفون: Yves Le Bissonnais, L. P. D’Acqui, Marcus Annerman, Oumarou Malam Issa, Christian Défarge, Béatrice Marin, Sophie Nordenberg, Odile Duval, Ary Bruand

المساهمون: Groupe d'Étude sur les Géomatériaux et Environnements Naturels, Anthropiques et Archéologiques - EA 3795 (GEGENAA), Université de Reims Champagne-Ardenne (URCA)-SFR Condorcet, Université de Reims Champagne-Ardenne (URCA)-Université de Picardie Jules Verne (UPJV)-Centre National de la Recherche Scientifique (CNRS)-Université de Reims Champagne-Ardenne (URCA)-Université de Picardie Jules Verne (UPJV)-Centre National de la Recherche Scientifique (CNRS), Institut des Sciences de la Terre d'Orléans (ISTO), Institut national des sciences de l'Univers (INSU - CNRS)-Université d'Orléans (UO)-Centre National de la Recherche Scientifique (CNRS), Unité de Science du Sol, Institut National de la Recherche Agronomique (INRA), Istituto per lo Studio degli Ecosistemi ISE-CNR, Istituto per lo Studio degli Ecosistemi, This work formed part of CYANOSOILS project funded by European Union, contract no. ICA4-CT-2001-10058, Université de Reims Champagne-Ardenne (URCA)-Université de Picardie Jules Verne (UPJV)-Centre National de la Recherche Scientifique (CNRS)-Université de Reims Champagne-Ardenne (URCA)-Université de Picardie Jules Verne (UPJV)-Centre National de la Recherche Scientifique (CNRS)-Maison des Sciences Humaines de Champagne-Ardenne (MSH-URCA), Université de Reims Champagne-Ardenne (URCA)-Université de Reims Champagne-Ardenne (URCA), Laboratoire d'étude des Interactions Sol - Agrosystème - Hydrosystème (UMR LISAH), Institut de Recherche pour le Développement (IRD)-Institut National de la Recherche Agronomique (INRA)-Centre international d'études supérieures en sciences agronomiques (Montpellier SupAgro)-Institut national d’études supérieures agronomiques de Montpellier (Montpellier SupAgro), Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro)-Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro), Université de Reims Champagne-Ardenne (URCA)-Centre National de la Recherche Scientifique (CNRS)-Université de Reims Champagne-Ardenne (URCA)-Centre National de la Recherche Scientifique (CNRS)-Maison des Sciences Humaines de Champagne-Ardenne (MSH-URCA)

المصدر: Plant and Soil
Plant and Soil, Springer Verlag, 2007, 290, pp.1-2, 209-219. ⟨10.1007/s11104-006-9153-9⟩
Plant and Soil, Springer Verlag, 2007, 290 (1-2), pp.1-2, 209-219. ⟨10.1007/s11104-006-9153-9⟩
Plant and Soil, 2007, 290 (1-2), pp.1-2, 209-219. ⟨10.1007/s11104-006-9153-9⟩
Plant and soil
290 (2007): 209–219. doi:10.1007/s11104-006-9153-9
info:cnr-pdr/source/autori:Issa Oumarou Malam; Christian Défarge; Yves Le Bissonnais; Béatrice Marin; Odile Duval; Ary Bruand; D'Acqui Luigi Paolo; Sofie Nordenberg; Marcus Annerman/titolo:Effects of the inoculation of cyanobacteria on the microstructure and the structural stability of a tropical soil/doi:10.1007%2Fs11104-006-9153-9/rivista:Plant and soil (Print)/anno:2007/pagina_da:209/pagina_a:219/intervallo_pagine:209–219/volume:290

مصطلحات موضوعية: Cyanobacteria, Nostoc, Microorganism, Soil Science, Plant Science, 010501 environmental sciences, Photosynthesis, Organo-mineral aggregates, 01 natural sciences, Cryo-SEM, Structural stability, Inoculation, Botany, [SDU.ENVI]Sciences of the Universe [physics]/Continental interfaces, environment, Incubation, 0105 earth and related environmental sciences, 2. Zero hunger, biology, Humidity, 04 agricultural and veterinary sciences, 15. Life on land, biology.organism_classification, 6. Clean water, Horticulture, Soil water, 040103 agronomy & agriculture, 0401 agriculture, forestry, and fisheries

الوصف: Cyanobacteria are widespread photosynthetic microorganisms among which some are able to fix atmospheric nitrogen. We investigated the impact of indigenous cyanobacteria strains (Nostoc) inoculation on physical characteristics of poorly aggregated soils from Guquka (Eastern Cape, South Africa). The soil aggregates (3–5 mm) were arranged into a layer of 10–20 mm thick, and sprayed with cyanobacteria solution. Subsequently the inoculated and un-inoculated samples were incubated (30°C, 80% humidity, continuous illumination at 100 μmol m−2 s−1). Their micromorphological characteristics and aggregate stability were investigated, after 1, 2, 3, 4 and 6 weeks of incubation, by using high resolution Cryo-SEM and aggregate breakdown tests. Micromorphological investigations revealed that the surface of un-inoculated samples remained uncovered, while the inoculated samples were partially covered by cyanobacteria material after one week of incubation. A dense superficial network of cyanobacterial filaments and extracellular polymer secretions (EPS) covered their surface after 4 and 6 weeks of incubation. Organo-mineral aggregates comprising cyanobacterial filaments and EPS were observed after 6 weeks of incubation. The results of aggregate breakdown tests showed no significant difference between un-inoculated samples after 1, 2, 3, 4 or 6 weeks, while they revealed improvement of aggregate stability for inoculated samples. The improvement of aggregate stability appeared in a short while following inoculation and increased gradually with time and cyanobacteria growth. The increase in aggregate stability is likely related to the changes induced in micromorphological characteristics by cyanobacterial filaments and EPS. It reflects the effect of coating, enmeshment, binding and gluing of aggregates and isolated mineral particles by cyanobacteria material. Our study presents new data demonstrating the improvement of soil physical quality in a few weeks after cyanobacteria inoculation. The interaction of the inocula and other biotic components is worthy of study before field application of cyanobacteria.

الوصول الحر: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::0470312af84c864e543f9a0bdbee67a7Test
https://hal-insu.archives-ouvertes.fr/hal-00120328/documentTest