Results 151 to 160 of about 21,289 (213)

Magneto-oncology: a radical pair primer. [PDF]

Front Oncol
Hore PJ.
europepmc   +1 more source

Nitrogen stable isotope fractionation by biological nitrogen fixation reveals cellular nitrogenase is diffusion limited. [PDF]

PNAS Nexus
Han E, Kopf SH, Maloney AE, Ai XE, Sigman DM, Zhang X.   +5 more
europepmc   +1 more source

Isotopic Exchange between Aqueous Fe(II) and Solid Fe(III) in Lake Sediment─A Kinetic Assemblage Approach. [PDF]

Environ Sci Technol
O'Connell DW, Mccammon C, Byrne JM, Jensen MM, Thamdrup B, Bruun Hansen HC, Postma D, Jakobsen R.   +7 more
europepmc   +1 more source

Direct (LC-)MS Identification of Regioisomers from C-H Functionalization by Partial Isotopic Labeling. [PDF]

ACS Cent Sci
Sojdak CA, Polefrone DA, Shah HM, Vu CD, Orzolek BJ, Jimenez Antenucci PM, Bush MV, Kozlowski MC.   +7 more
europepmc   +1 more source

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On the Origin of Conformational Kinetic Isotope Effects

Angewandte Chemie International Edition, 2011
Neatly dissected: The computed conformational kinetic isotope effects (KIEs) for biphenyls 1 and 2 (X=D or H) are in good agreement with experimental values and have been partitioned according to the Bigeleisen–Mayer and ΔH/ΔS approaches. In [D8]-1 the KIE is dominated by a normal entropic contribution which overshadows an enthalpic contribution ...
O'Leary, D. J., Rablen, Paul R., Meyer, M. P.   +2 more
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Kinetic hydrogen isotope effect

Journal of Chemical Education, 1986
This note describes three simple demonstrations or laboratory exercises that illustrate kinetic hydrogen isotopic effects.
David A. Binder, Robert Eliason
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On the kinetic isotope effect in cracking

The International Journal of Applied Radiation and Isotopes, 1959
Resume On decrit des recherches sur l'effet kinetique des isotopes dans la degradation du C 14 H 3 -C 14 H 3 et du C 14 H 3 -C 14 H 3 . Les resultats obtenus sont d'accord avec l'hypothese propose sur l'effet que prete la symetrie aux taux de decomposition.
R. A. Kalinenko, K. P. Lavrovsky, A. M. Brodsky   +2 more
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Kinetic Isotope Effect [PDF]

, 2014
Molecules with different isotopic compositions generally react with other molecules in the same manner, but their reaction rates show differences due to their mass differences and sometimes also due to the lower natural abundance of certain isotopes. For example, CO2 is heavier than CO2 by about 2.3 %, and the abundance ratio of CO2/ CO2 is about 1.1 %.
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Isotope Effects in Chemical Kinetics

Annual Review of Physical Chemistry, 1975
Recent studies on hydrogen isotope transfer reactions in the gas phase chemistry of thermal and excited species, ionic systems, and reactive scattering and theoretical attempts made to rationalize experimental observations are critically reviewed. Topics discussed are bimolecular reactions, termolecular reactions, unimolecular decomposition reactions ...
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