Results 21 to 30 of about 386,226 (302)

Nitrogen Kinetic Isotope Effects of Nitrification by the Complete Ammonia Oxidizer Nitrospira inopinata

mSphere, 2021
Analysis of nitrogen isotope fractionation effects is useful for tracing biogeochemical nitrogen cycle processes. Nitrification can cause large nitrogen isotope effects through the enzymatic oxidation of ammonia (NH3) via nitrite (NO2−) to nitrate (NO3−)
Shurong Liu, Man-Young Jung, Shasha Zhang, Michael Wagner, Holger Daims, Wolfgang Wanek   +5 more
doaj   +1 more source

Isotope mass dependence of pedestal transport in JET H-mode plasmas

Nuclear Fusion, 2023
We present a comparative transport analysis of the isotope mass dependence in the pedestal of two pairs of deuterium/hydrogen type I ELMy H-mode discharges in JET with ITER-like wall, one characterized by the same input power, the other one by the same ...
I. Predebon, D.R. Hatch, L. Frassinetti, L. Horvath, S. Saarelma, B. Chapman-Oplopoiou, T. Görler, C.F. Maggi, JET Contributors   +8 more
doaj   +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, Dyckmans, Jens, Kaiser, Jan, Lewicka-Szczebak, Dominika, Marca, Alina, Well, Reinhard   +5 more
core   +1 more source

Boron isotope effect in single crystals of ErNi$_2$B$_2$C superconductor

, 2012
The influence of local moment magnetism on the boron isotope effect of T$_c$ was studied on single crystals of ErNi$_2$B$_2$C. Values of the partial isotope effect exponent of $\alpha_B$=0.10$\pm$0.02 and $\alpha_B$=0.10$\pm$0.04 were obtained based on ...
Abrikosov A, Bill A, Halyna Hodovanets, Paul C. Canfield, Sergey L. Bud’ko, Sheng Ran   +5 more
core   +1 more source

Isotope effect in superconductors with coexisting interactions of phonon and nonphonon mechanisms

, 2003
We examine the isotope effect of superconductivity in systems with coexisting interactions of phonon and nonphonon mechanisms in addition to the direct Coulomb interaction.
Anderson P. W., Beal-Monod M. T., Crawford M. K., Emery V. J., Foulkes I. F., Heidmann C.-P., Ishiguro T., Ito H., Kikugawa N., Kini A. M., Klein B. M., Kuwabara T., Maeno Y., Mao Z. Q., Miyake K., Oguchi T., Oshima K., Rice T. M., Scalapino D. J., Schlueter J. A., Shimahara H., Shimahara H., Shimahara H., Shimahara H., Shimahara H., Tokumoto M., Yamaji K.   +26 more
core   +1 more source

Insights Into the Known 13C Depletion of Methane—Contribution of the Kinetic Isotope Effects on the Serine Hydroxymethyltransferase Reaction

Frontiers in Chemistry, 2022
We determined the kinetic isotope effect on the serine hydroxymethyltransferase reaction (SHMT), which provides important C1 metabolites that are essential for the biosynthesis of DNA bases, O-methyl groups of lignin and methane. An isotope effect on the
Gerd Gleixner
doaj   +1 more source

Isotope effect on the electron band structure of doped insulators [PDF]

, 2004
Applying a continuous-time quantum Monte-Carlo algorithm we calculate the exact coherent band dispersion and the density of states of a two dimensional lattice polaron in the region of parameters where any approximation might fail.
Alexandrov, A. S., Kornilovitch, P. E.
core   +2 more sources

1,2-3H-Cholesterol as a tracer in studies of human cholesterol metabolism

Journal of Lipid Research, 1967
1,2-3H-Cholesterol was fed to a subject together with 4-14C-cholesterol at a known 3H/14C ratio. The ratio was satisfactorily preserved in cholesterol recovered from plasma, red cells, and bile, and in bile acids of bile.Isotopic fractionation was seen ...
Peter D.S. Wood, Daphne Myers, Yuen-Ling Lee, Ryuzo Shioda, Laurance W. Kinsell   +4 more
doaj   +1 more source

Dynamical Mean-Field Theory of Electron-Phonon Interactions in Correlated Systems: Application to Isotope Effects on Electronic Properties

, 2002
We use a recently developed formalism (combining an adiabatic expansion and dynamical mean-field theory) to obtain expressions for isotope effects on electronic properties in correlated systems.
A. Deppeler, A. Georges, A. J. Millis, A.B. Migdal, A.J. Millis, A.K. Heilman, A.M. Balagurov, Andreas Deppeler, C. Grimaldi, C. Grimaldi, C.A. Reynolds, C.P. Adams, E. Maxwell, G.M. Eliashberg, G.M. Zhao, G.M. Zhao, G.M. Zhao, G.M. Zhao, G.M. Zhao, G.M. Zhao, G.M. Zhao, G.M. Zhao, G.M. Zhao, I. Isaac, J.K. Freericks, J.P. Franck, M.S. Fuhrer, N.A. Babushkina, P. Benedetti, R. Mahesh, R.A. Fisher, V.N. Smolyaninova   +31 more
core   +1 more source

Experimental study and gyrokinetic simulations of isotope effects on core heat transport in JET tokamak deuterium and tritium plasmas

Nuclear Fusion
This paper presents a study on the dependence of the ion temperature stiffness on the plasma main ion isotope mass in JET ITER-like wall and C wall discharges.
D. Brioschi, P. Mantica, A. Mariani, N. Bonanomi, E. Delabie, J. Garcia, N. Hawkes, I. Jepu, D. Keeling, E. Lerche, E. Litherland-Smith, C.F. Maggi, S. Menmuir, G. Szepesi, D. Taylor, D. Van Eester, JET Contributors   +16 more
doaj   +1 more source