Results 21 to 30 of about 6,179,886 (326)

Three-isotope plot of fractionation in photolysis: A perturbation theoretical expression [PDF]

open access: yes, 2005
The slope of the three-isotope plot for the isotopomer fractionation by direct or nearly direct photodissociation is obtained using a perturbation theoretical analysis.
Marcus, R. A., Prakash, M. K.
core   +1 more source

Oxidizable fractions of soil organic carbon in Caatinga forest submitted to different forest managements

open access: yesCiência Rural, 2018
: One of the main alternatives for the rational exploitation of the Caatinga biome’s natural resources is sustainable forest management. Soil organic carbon (SOC) and its fractions can be used to evaluate the conservation status of forest ecosystems ...
Suellen Gomes Monteiro Batista   +4 more
doaj   +1 more source

Pollution characteristics and ecological risk assessment of heavy metals in the surface sediments from a source water reservoir

open access: yesChemical Speciation & Bioavailability, 2016
Surface sediment samples were collected from a source water reservoir in Zhejiang Province, East of China to investigate pollution characteristics and potential ecological risk of heavy metals.
Changming Yang   +4 more
doaj   +1 more source

Isotopic fractionation in proteins as a measure of hydrogen bond length [PDF]

open access: yes, 2015
If a deuterated molecule containing strong intramolecular hydrogen bonds is placed in a hydrogenated solvent it may preferentially exchange deuterium for hydrogen.
Athokpam, Bijyalaxmi   +2 more
core   +2 more sources

Chemical Fractionation of Trace Elements in Arctic PM10 Samples

open access: yesAtmosphere, 2021
In this study, the information potential of a two-step sequential extraction procedure was evaluated. For this purpose, first of all the elemental composition of Arctic PM10 samples collected in Ny-Ålesund (Svalbard Islands) from 28 February 2015 to 21 ...
Eleonora Conca   +7 more
doaj   +1 more source

Proposal for International Agreement on Ca Notation resulting from discussion at workshops on stable isotope measurement held in Davos (Goldschmidt 2002) and Nice (EGS-AGU-EUG 2003) [PDF]

open access: yes, 2004
A proposal is made to standardise the reporting of Ca isotope data to the δ44Ca/40Ca notation (or δ44Ca/42Ca) and to adopt NIST SRM 915a as the reference ...
Bock, Barbara   +8 more
core   +1 more source

The provenance of selected heavy metals in soils near power plant of Hamedan: A pedological approach

open access: yesمجله آب و خاک, 2014
To determine the origin of heavy metals, the effects of parent materials, soil genesis, and human activities on the content and distribution of selected metals in soils near Mofateh Martyr powerhouse, Hamedan, were assessed.
Sh. Nosratipoor   +3 more
doaj   +1 more source

How well does ramped thermal oxidation quantify the age distribution of soil carbon? Assessing thermal stability of physically and chemically fractionated soil organic matter [PDF]

open access: yesBiogeosciences, 2023
Carbon (C) in soils persists on a range of timescales depending on physical, chemical, and biological processes that interact with soil organic matter (SOM) and affect its rate of decomposition.
S. W. Stoner   +8 more
doaj   +1 more source

Probing Mechanical and Chemical Instabilities in Neutron-Rich Matter [PDF]

open access: yes, 2001
The isospin-dependence of mechanical and chemical instabilities is investigated within a thermal and nuclear transport model using a Skyrme-type phenomenological equation of state for neutron-rich matter.
Akmal   +49 more
core   +2 more sources

A biomimetic peptide has no effect on the isotopic fractionation during in vitro silica precipitation

open access: yesScientific Reports, 2021
The stable isotopic composition of diatom silica is used as a proxy for nutrient utilisation in natural waters. This approach provides essential insight into the current and historic links between biological production, carbon cycling and climate ...
Lucie Cassarino   +2 more
doaj   +1 more source

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