Results 11 to 20 of about 107,082 (295)

Improving the Luminescence and Stability of Carbon-Centered Radicals by Kinetic Isotope Effect [PDF]

Molecules, 2023
The kinetic isotope effect (KIE) is beneficial to improve the performance of luminescent molecules and relevant light-emitting diodes. In this work, the influences of deuteration on the photophysical property and stability of luminescent radicals are ...
Zhichao Ma, Lintao Zhang, Zhiyuan Cui, Xin Ai   +3 more
doaj   +2 more sources

Extraordinarily large kinetic isotope effect on alkene hydrogenation over Rh-based intermetallic compounds [PDF]

Science and Technology of Advanced Materials, 2019
A series of Rh-based intermetallic compounds supported on silica was prepared and tested in alkene hydrogenation at room temperature. H2 and D2 were used as the hydrogen sources and the kinetic isotope effect (KIE) in hydrogenation was studied.
Shinya Furukawa, Pingping Yi, Yuji Kunisada, Ken-Ichi Shimizu   +3 more
doaj   +2 more sources

Strong inverse kinetic isotope effect observed in ammonia charge exchange reactions [PDF]

Nature Communications, 2020
Inverse kinetic isotope effects (KIEs) are rarely observed. Here, the authors report an inverse KIE in the charge transfer reaction of $${{\rm{Xe}}}^{+}$$ Xe+ with ammonia.
L. S. Petralia, A. Tsikritea, J. Loreau, T. P. Softley, B. R. Heazlewood   +4 more
doaj   +2 more sources

Anomalously large kinetic isotope effect

Open Chemistry, 2007
AbstractActivated diffusion of water between macromolecules in swollen cellulose is accompanied by anomalously high kinetic isotope effects of oxygen. The separation factor of heavy-oxygen water (H218O /H216O) is thousands of permilles instead of tens of permilles according to modern Absolute Rate Theory.
Krinkin David
doaj   +2 more sources

Elucidating protonation pathways in CO2 photoreduction using the kinetic isotope effect [PDF]

Nature Communications
The surge in anthropogenic CO2 emissions from fossil fuel dependence demands innovative solutions, such as artificial photosynthesis, to convert CO2 into value-added products.
Shikang Yin, Yiying Zhou, Zhonghuan Liu, Huijie Wang, Xiaoxue Zhao, Zhi Zhu, Yan Yan, Pengwei Huo   +7 more
doaj   +2 more sources

Advances in Kinetic Isotope Effect Measurement Techniques for Enzyme Mechanism Study [PDF]

Molecules, 2013
Kinetic isotope effects (KIEs) are a very powerful tool for investigating enzyme mechanisms. Precision of measurement is the most important factor for KIE determinations, especially for small heavy atom KIEs.
Hong Gu, Shuming Zhang
doaj   +2 more sources

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

Tunneling of Hydrogen and Deuterium Atoms on Interstellar Ices (Ih and ASW)

Frontiers in Astronomy and Space Sciences, 2021
Model calculations are performed to investigate the kinetic isotope effect of hydrogen and deuterium atom diffusion on hexagonal ice and amorphous solid water. Comparisons with experimental results by Kuwahata et al. (Phys. Rev. Lett., Sep. 2015, 115 (13)
Gunnar Nyman
doaj   +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
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Tunneling in the Hydrogen-Transfer Reaction from a Vitamin E Analog to an Inclusion Complex of 2,2-Diphenyl-1-picrylhydrazyl Radical with β-Cyclodextrin in an Aqueous Buffer Solution at Ambient Temperature

Antioxidants, 2021
Recently, increasing attention has been paid to quantum mechanical behavior in biology. In this study, we investigated the involvement of quantum mechanical tunneling in the hydrogen-transfer reaction from Trolox, a water-soluble analog of vitamin E (α ...
Ikuo Nakanishi, Yoshimi Shoji, Kei Ohkubo, Shunichi Fukuzumi   +3 more
doaj   +1 more source