Results 61 to 70 of about 12,351,463 (390)
Sulfur Isotope Effects of Dissimilatory Sulfite Reductase
bioRxiv, 2015 The precise interpretation of environmental sulfur isotope records requires a quantitative understanding of the biochemical controls on sulfur isotope fractionation by the principle isotope-fractionating process within the S cycle, microbial sulfate ...
W. Leavitt +4 more
semanticscholar +1 more source
NMR and IR Investigations of Strong Intramolecular Hydrogen Bonds
Molecules, 2017 For the purpose of this review, strong hydrogen bonds have been defined on the basis of experimental data, such as OH stretching wavenumbers, νOH, and OH chemical shifts, δOH (in the latter case, after correction for ring current effects). Limits for O–H·
Poul Erik Hansen, Jens Spanget-Larsen
doaj +1 more source
Shifts in rotifer life history in response to stable isotope enrichment: testing theories of isotope effects on organismal growth [PDF]
Royal Society Open Science, 2017 In ecology, stable isotope labelling is commonly used for tracing material transfer in trophic interactions, nutrient budgets and biogeochemical processes.
Elena Gorokhova
doaj +1 more source
Isotope effect in the presence of a pseudogap [PDF]
Physical Review B, 2000 6 pages, 3 Postscript figures, submitted to Phys.
openaire +3 more sources
An approximate theory of the ozone isotopic effects: Rate constant ratios and pressure dependence [PDF]
, 2007 The isotopic effects in ozone recombination reactions at low pressures are studied using an approximate theory which yields simple analytic expressions for the individual rate constant ratios, observed under “unscrambled” conditions. It is shown that the
Gao, Yi Qin, Marcus, R. A.
core +1 more source
The mechanism of oxygen isotope fractionation during N2O production by denitrification [PDF]
, 2015 The isotopic composition of soil-derived N2O can help differentiate between N2O production pathways and estimate the fraction of N2O reduced to N2. Until now, δ18O of N2O has been rarely used in the interpretation of N2O isotopic signatures because of ...
Augustin, Jürgen +5 more
core +1 more source
Journal of the American Chemical Society, 2014 The mechanism of the Wittig reaction of anisaldehyde with a stabilized ylide was studied by a combination of 13C kinetic isotope effects, conventional calculations, and molecular dynamics calculations in a cluster of 53 THF molecules. The isotope effects
Zhuo Chen +3 more
semanticscholar +1 more source
Nonequilibrium H/D isotope effects from trajectory-based nonadiabatic dynamics.
Journal of Physical Chemistry A, 2014 Ground-state equilibrium kinetic isotope effects can be treated well in the framework of transition state theory, whereas excited-state nonequilibrium isotope effects are theoretically less explored.
Lasse Spörkel +3 more
semanticscholar +1 more source
Circulating histones as clinical biomarkers in critically ill conditions
FEBS Letters, EarlyView.Circulating histones are emerging as promising biomarkers in critical illness due to their diagnostic, prognostic, and therapeutic potential. Detection methods such as ELISA and mass spectrometry provide reliable approaches for quantifying histone levels in plasma samples.
José Luis García‐Gimenez +17 more
wiley +1 more source
Communications Earth & EnvironmentCompositional heterogeneity exists in Earth’s deep mantle, which can be caused by the subduction of oceanic slabs. How early this process started on Earth remains highly debated due to the scarcity of early Archean materials with pristine mantle ...
Dongjian Ouyang +3 more
doaj +1 more source