Results 21 to 30 of about 1,644,826 (290)

Progress of Analytical Techniques for Stable Iron Isotopes

Yankuang ceshi, 2020
BACKGROUND Iron is the most abundant element on earth with variable valences. It is widely distributed in various minerals, rocks, fluids and organisms, and is involved in diagenesis, mineralization, hydrothermal activities and life activities. The study
QIN Yan, XU Yan-ming, HOU Ke-jun, LI Yan-he, CHEN Lei   +4 more
doaj   +1 more source

Transport and reaction of iron and iron stable isotopes in glacial meltwaters on Svalbard near Kongsfjorden: From rivers to estuary to ocean

Earth and Planetary Science Letters, 2015
Ruifeng Zhang, S. John, Jing Zhang, J. Ren, Ying Wu, Zhuoyi Zhu, Sumei Liu, Xunchi Zhu, C. Marsay, Fred Wenger   +9 more
semanticscholar   +3 more sources

Altered Expression of Mitoferrin and Frataxin, Larger Labile Iron Pool and Greater Mitochondrial DNA Damage in the Skeletal Muscle of Older Adults

Cells, 2020
Mitochondrial dysfunction and iron (Fe) dyshomeostasis are invoked among the mechanisms contributing to muscle aging, possibly via a detrimental mitochondrial–iron feed-forward loop.
Anna Picca, Sunil K. Saini, Robert T. Mankowski, George Kamenov, Stephen D. Anton, Todd M. Manini, Thomas W. Buford, Stephanie E. Wohlgemuth, Rui Xiao, Riccardo Calvani, Hélio José Coelho-Júnior, Francesco Landi, Roberto Bernabei, David A. Hood, Emanuele Marzetti, Christiaan Leeuwenburgh   +15 more
doaj   +1 more source

More than redox, biological organic ligands control iron isotope fractionation in the riparian wetland

Scientific Reports, 2021
Although redox reactions are recognized to fractionate iron (Fe) isotopes, the dominant mechanisms controlling the Fe isotope fractionation and notably the role of organic matter (OM) are still debated. Here, we demonstrate how binding to organic ligands
Elaheh Lotfi-Kalahroodi, Anne-Catherine Pierson-Wickmann, Olivier Rouxel, Rémi Marsac, Martine Bouhnik-Le Coz, Khalil Hanna, Mélanie Davranche   +6 more
doaj   +1 more source

Iron isotopes and the redox evolution of Ediacaran sediments

Comptes Rendus. Géoscience, 2021
The Ediacaran age (ca. 570 Ma) Shuram excursion, a ca. $12‰$ depletion in $\delta ^{13}\mathrm{C}_{\mathrm{carb}}$, may record a dramatic oxidation of marine sediments associated with a reorganization of Earth’s carbon cycle closely preceding the rise of
Moynier, Frederic, Fike, David A., Menard, Gabrielle, Fischer, Woodward W., Grotzinger, John P., Agranier, Arnaud   +5 more
doaj   +1 more source

Analyzing the Quenchable Iron Pool in Murine Macrophages by Flow Cytometry

Bio-Protocol, 2020
Tissue-resident macrophages are pivotal for a tightly-regulated iron metabolism at a cellular and systemic level, since subtle iron alterations increase the susceptibility for microbial infections or drive multiple diseases. However, research on cellular
Michael Riedelberger, Karl Kuchler
doaj   +1 more source

Stable Isotopes Unveil Dietary Trends in the Samnite and Peligni Communities of Opi Val Fondillo and Sulmona S. Lucia (V–VI Centuries BCE, Abruzzo, Central Italy)

Biology, 2023
The purpose of this study is to gain insights into the subsistence activities and nutrition of the Samnite and Peligni populations who lived in the Abruzzo region (Italy) during the Iron Age. The samples under investigation are from Opi Val Fondillo (AQ)
Iuri Icaro, Inmaculada Alemán, Joan Viciano   +2 more
doaj   +1 more source

Iron isotopic fractionation in mineral phases from Earth's lower mantle: Did terrestrial magma ocean crystallization fractionate iron isotopes?

Earth and Planetary Science Letters, 2019
Iron is the most abundant transition metal in the Earth's interior, yet considerable uncertainties remain as to why mantle-derived rocks have diverse iron isotopic compositions.
Hong Yang, Jung‐Fu Lin, Michael Y. Hu, M. Roskosz, W. Bi, Jiyong Zhao, E. Alp, Jin Liu, Jiachao Liu, R. Wentzcovitch, T. Okuchi, N. Dauphas   +11 more
semanticscholar   +1 more source

Iron isotope anomalies

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
openaire   +1 more source

Uniquely low stable iron isotopic signatures in deep marine sediments caused by Rayleigh distillation

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, Michael Staubwasser, Anette Meixner, Simone A. Kasemann, Hayley R. Manners, Yuki Morono, Fumio Inagaki, Verena B. Heuer, Sabine Kasten, Susann Henkel   +9 more
doaj   +1 more source