Results 21 to 30 of about 14,752 (295)

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

SQUID-SIMS is a useful approach to uncover primary signals in the Archean sulfur cycle [PDF]

, 2014
The Agouron Institute and National Aeronautic and Space Administration Exobiology Award NNX09AM91G supported this work.Many aspects of Earth's early sulfur cycle, from the origin of mass-anomalous fractionations to the degree of biological participation,
Guan, Yunbin, Woodward W. Fischer, Fike, David A., Fike, David A, Jena E. Johnson, Raub, Timothy D, David A. Fike, Fischer, Woodward W., Johnson, Jena E, Eiler, John M, Timothy D. Raub, Raub, Timothy D., Yunbin Guan, Kirschvink, Joseph L., Johnson, Jane E., Joseph L. Kirschvink, John M. Eiler, Fischer, Woodward W, Kirschvink, Joseph L, Eiler, John M.   +19 more
core   +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

Fractionation of iron species and iron isotopes in the Baltic Sea euphotic zone [PDF]

Biogeosciences, 2010
To indentify sources and transport mechanisms of iron in a coastal marine environment, we conducted measurements of the physiochemical speciation of Fe in the euphotic zone at three different locations in the Baltic Sea.
J. Gelting, E. Breitbarth, B. Stolpe, M. Hassellöv, J. Ingri   +4 more
doaj   +1 more source

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, Habacuc Pérez-Tribouillier, Taryn L. Noble, Ashley T. Townsend, Andrew R. Bowie, Andrew R. Bowie, Zanna Chase   +6 more
doaj   +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

Radiocarbon and stable isotope evidence of dietary change from the Mesolithic to the Middle Ages in the iron gates: New results from Lepenski Vir [PDF]

, 2004
A previous radiocarbon dating and stable isotope study of directly associated ungulate and human bone samples from Late Mesolithic burials at Schela Cladovei in Romania established that there is a freshwater reservoir effect of approximately 500 yr in ...
Radovanovic, I., Hedges, Robert, Bonsall, C., Cook, G.T., Higham, Thomas F G., Hedges, R.E.M., Pickard, Catriona, Cook, G. T., Higham, Thomas, Pickard, C., Higham, T.F.G., Cook, Gordon, Radovanović, Ivana, Hedges, R. E. M., Bonsall, Clive, Higham, T. F. G.   +15 more
core   +1 more source

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, M. R Ghasemi, A Hashemizadeh, P Sarabadani, H Bakhtiari, S. M Mohati, H Seyedi, H Sadri, M Sharbatdaran   +8 more
doaj  

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