Results 11 to 20 of about 1,644,826 (290)
The geologic history of seawater oxygen isotopes from marine iron oxides
Science, 2019 Not as hot as we thought Earth's early oceans appear not to have been as hot as some have suggested. The oxygen isotope composition of marine carbonates has changed markedly over the past 3.5 billion years.
Nir Galili +17 more
semanticscholar +3 more sources
Screening Effects on Electron-Capture Rates and Type Ia Supernova Nucleosynthesis [PDF]
EPJ Web of Conferences, 2022 Nucleosynthesis of iron-group elements in Type Ia supernovae is studied for single-degenerate models with the use of electron-capture rates updated with the new shell-model Hamiltonian in pf -shell.
Suzuki Toshio +6 more
doaj +1 more source
Bioturbation and the δ56Fe signature of dissolved iron fluxes from marine sediments
Royal Society Open Science, 2023 We developed a reaction-transport model capable of tracing iron isotopes in marine sediments to quantify the influence of bioturbation on the isotopic signature of the benthic dissolved (DFe) flux.
Sebastiaan J. van de Velde +2 more
doaj +1 more source
Iron Isotopic Composition of Biological Standards Relevant to Medical and Biological Applications
Frontiers in Medicine, 2021 Iron isotopes are fractionated by multiple biological processes, which offers a novel opportunity to study iron homeostasis. The determination of Fe isotope composition in biological samples necessitates certified biological reference materials with ...
Edith Kubik +5 more
doaj +1 more source
Mechanisms and rates of pyrite formation from hydrothermal fluid revealed by iron isotopes
Geochimica et Cosmochimica Acta, 2021 Critical to interpreting iron isotope signatures in hydrothermal sulfide minerals is the accurate knowledge of Fe isotope fractionation factors, both kinetic and at equilibrium, between the fluid and minerals.
G. Pokrovski +3 more
semanticscholar +1 more source
Holocene Spatiotemporal Redox Variations in the Southern Baltic Sea
Frontiers in Earth Science, 2021 Low oxygen conditions in the modern Baltic Sea are exacerbated by human activities; however, anoxic conditions also prevailed naturally over the Holocene. Few studies have characterized the specific paleoredox conditions (manganous, ferruginous, euxinic)
Dalton S. Hardisty +5 more
doaj +1 more source
Frontiers in Environmental Chemistry, 2021 Multi-collector inductively coupled plasma mass spectrometers (MC-ICPMS) are widely used for Fe isotope measurements. The latter may be perturbed by interferences (notably from Cr and Ni) and matrix effects (notably from major elements), caused by ...
F. Lacan +5 more
doaj +1 more source
Women's Health Reports, 2022 Introduction: Pregnant women are a vulnerable population that are difficult to engage in clinical research. We report successful recruitment and retention strategies used in a longitudinal pilot study of urban racially/ethnically diverse pregnant women ...
Mary Dawn Koenig +11 more
doaj +1 more source
Frontiers in Medicine, 2021 Hereditary hemochromatosis is a genetic iron overload disease related to a mutation within the HFE gene that controls the expression of hepcidin, the master regulator of systemic iron metabolism. The natural stable iron isotope composition in whole blood
Emmanuelle Albalat +5 more
doaj +1 more source
The evaluation of the fission mode and fragment yields of neutron-rich nuclei by the dynamical model [PDF]
EPJ Web of Conferences, 2023 Nucleosynthesis by the rapid neutron-capture process (r-process) produces elements heavier than iron via neutron-rich nuclides, observed in the solar system and stars with various metallicities.
Tanaka Shoya +3 more
doaj +1 more source