Results 21 to 30 of about 27,362 (303)
Iron and zinc isotope fractionation during uptake and translocation in rice (Oryza sativa) grown in oxic and anoxic soils [PDF]
, 2015 Stable isotope fractionation is emerging quickly as a powerful novel technique to study metal uptake and translocation in plants. Fundamental to this development is a thorough understanding of the processes that lead to isotope fractionation under ...
Zhao, F-J. +13 more
core +1 more source
Isotope fractionation during the synthesis of MDMA.HCl from helional
, 2022 An investigation into isotopic fractionation during the production of 3,4-methylenedioxymethylamphetamine (MDMA) from the novel precursor helional, and during the hydrochloric (HCl) salt precipitation of MDMA was conducted.
Cresswell, Sarah L +4 more
core +1 more source
Frontiers in Microbiology, 2017 We investigated the influence of organic substrates and phosphate concentration on the rates of dissimilatory microbial sulfate reduction and the 34S/32S isotopic fractionation produced by several Desulfovibrio species.
Shikma Zaarur +3 more
doaj +1 more source
Nitrogen transformation pathways, rates, and isotopic signatures in Lake Lugano [PDF]
, 2014 The consequences of detrimental alterations caused to the natural nitrogen (N) cycle are manifold. To tackle problems, such as eutrophication of coastal marine and lacustrine environments, or increasing emissions of greenhouse gas nitrous oxide (N2O ...
Wenk, Christine B.
core +1 more source
Divergent biochemical fractionation, not convergent temperature, explains cellulose oxygen isotope enrichment across latitudes. [PDF]
PLoS ONE, 2011 Recent findings based on the oxygen isotope ratios of tree trunk cellulose indicate that the temperature of biomass production in biomes ranging from boreal to subtropical forests converge to an average leaf temperature of 21.4°C.
Leonel Sternberg +1 more
doaj +1 more source
Solid Earth Sciences, 2019 In this study, silicon isotope fractionation factors for metamorphic silicate including muscovite, epidote, and kyanite are calculated using first-principles methods based on density-functional theory.
Yuanhong Li +3 more
doaj +1 more source
An internally-consistent database for oxygen isotope fractionation between minerals [PDF]
, 2019 The knowledge of the fractionation behaviour between phases in isotopic equilibrium and its evolution with temperature is fundamental to assist the petrological interpretation of measured oxygen isotope compositions. We report a comprehensive and updated
Vho, Alice +2 more
core +1 more source
Molybdenum isotope fractionation in the mantle [PDF]
Geochimica et Cosmochimica Acta, 2017 We report double-spike molybdenum (Mo) isotope data for forty-two mafic and fifteen ultramafic rocks from diverse locations and compare these with results for five chondrites. The δ98/95Mo values (normalized to NIST SRM 3134) range from −0.59 ± 0.04 to +0.10 ± 0.08‰.
Liang, Yu-Hsuan +6 more
openaire +5 more sources
Microbially mediated kinetic sulfur isotope fractionation: reactive transport modeling benchmark [PDF]
, 2020 Microbiallymediated sulfate reduction is a ubiquitous process inmany subsurface systems. Isotopic fractionation is characteristic of this anaerobic process, since sulfate-reducing bacteria (SRB) favor the reduction of the lighter sulfate isotopologue ...
Wanner, Christoph +18 more
core +1 more source
Frontiers in Earth Science, 2022 Redox reactions control the mobility and bioavailability of selenium (Se) in biogeochemical systems, both modern and ancient. Se isotope ratio measurements (e.g., 82Se/76Se) have been developed to enhance understanding of biogeochemical transformations ...
Pranjal Dwivedi +4 more
doaj +1 more source