Results 31 to 40 of about 952,040 (271)
The marine geochemistry of iron and iron isotopes [PDF]
, 2004 This thesis addressed questions about the Fe cycle by measuring detailed profiles and transects of Fe species in the ocean and also by exploring the use of a new tracer of Fe, Fe isotopic fractionation. In the subtropical and tropical Atlantic Ocean, transects and profiles are presented for dissolved Fe ([less than]0.4 m), soluble Fe ([less than]0.02 ...
openaire +4 more sources
Enrichment of 54Fe by Electromagnetic Isotope Separator (EMIS) [PDF]
مجله علوم و فنون هستهای, 2014 Electromagnetic Isotopes Separator (EMIS) has been installed in Karaj since 1991 in order to separate isotopes of a wide range of elements. Iron is successfully separated. Iron element has four stable isotopes, 58Fe, 57Fe, 56Fe and 54Fe.
Z Asadollahi +8 more
doaj
Quantifying Lithogenic Inputs to the Southern Ocean Using Long-Lived Thorium Isotopes
Frontiers in Marine Science, 2020 Thorium (Th) isotopes were applied to quantify the supply of lithogenic inputs from the Kerguelen Plateau to the Southern Ocean. The dissolved concentrations of 232Th and 230Th were measured following a novel pre-concentration method using the Nobias ...
Habacuc Pérez-Tribouillier +6 more
doaj +1 more source
Scientific Reports, 2023 Dissimilatory iron reduction (DIR) is suggested to be one of the earliest forms of microbial respiration. It plays an important role in the biogeochemical cycling of iron in modern and ancient sediments.
Male Köster +9 more
doaj +1 more source
The Astrophysical Journal, 1989 Precise determinations of the Fe isotope abundances yield identical results for a terrestrial standard and for samples of carbonaceous meteorites. Fe-54/Fe-56 = 0.062669; Fe-57/Fe-56 = 0.023261 + or - 0.000002; and Fe-58/Fe-56 = 0.0031132 + or - 0.0000011 are found.
J. Voelkening, D. A. Papanastassiou
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Recycled iron fuels new production in the eastern equatorial Pacific Ocean
Nature Communications, 2017 In the eastern equatorial Pacific, upwelling supplies nitrate in excess of iron relative to phytoplankton requirements. Here, using nitrate isotopes, the authors show that iron recycling in surface waters supports nitrate consumption, lowering surface ...
Patrick A. Rafter +2 more
doaj +1 more source
Iron Composition of a Typical Loess-Paleosol Sequence in Northeast China
AgronomyIron isotope compositions, along with the partial extraction of iron in its various forms, can be utilized to investigate the complex interplay of iron migration and transformation with respect to iron isotope patterns.
Zhong-Xiu Sun +2 more
doaj +1 more source
Distinct iron cycling in a Southern Ocean eddy
Nature Communications, 2020 Eddies are common ocean features that isolate large swaths of seawater, but it is unclear how they influence productivity of phytoplankton trapped inside.
Michael J. Ellwood +5 more
doaj +1 more source
Use of Ra isotopes to deduce rapid transfer of sediment-derived inputs off Kerguelen [PDF]
Biogeosciences, 2015 The Southern Ocean is known to be the largest high-nutrient, low-chlorophyll (HNLC) region of the global ocean due to iron limitation. However, a large phytoplankton bloom develops annually downstream of the Kerguelen Islands, a bloom which is sustained ...
V. Sanial +7 more
doaj +1 more source
Iron incorporation and post-malaria anaemia. [PDF]
PLoS ONE, 2008 Iron supplementation is employed to treat post-malarial anaemia in environments where iron deficiency is common. Malaria induces an intense inflammatory reaction that stalls reticulo-endothelial macrophagal iron recycling from haemolysed red blood cells ...
Conor P Doherty +6 more
doaj +1 more source